Equidistant stretching device of filter plate of filter press for lime kiln desulfurization sludge

Abstract

The utility model belongs to the technical field of equidistant stretching of a filter plate of a filter press for lime kiln desulfurization sludge, and discloses an equidistant stretching device of a filter plate of a filter press for lime kiln desulfurization sludge, which is characterized in that a sliding body is fixedly arranged in the middle of the front and rear side surfaces of a frame type filter plate; the thrust plate is fixedly arranged on the upper portion of the right inner side face of the support. The fixed body is fixedly arranged in the middle of the front and rear side surfaces of the thrust plate; the filtered water discharge pipes are fixedly arranged on the front side and the rear side of the bottom of the frame type filter plate, and the filtered water discharge pipes are communicated with the interior of the frame type filter plate; the lifting equidistant stretching mechanisms are fixedly arranged on the front side and the rear side of the support respectively, and the lifting equidistant stretching mechanisms achieve one-time stretching action on the frame type filter plate through lifting action. The utility model has the beneficial effects that under the lifting matching of the lifting equidistant stretching mechanism, the frame type filter plate can be stretched at one time, so that sludge cakes formed by filtering can be discharged at one time, and the discharging operation efficiency of the sludge filter cakes is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of equidistant extension of filter plates for filter presses used in lime kiln desulfurization sludge, and specifically relates to an equidistant extension device for filter plates used in filter presses used in lime kiln desulfurization sludge. Background Technology

[0002] The desulfurization process for lime kiln flue gas is both a mandatory requirement of environmental protection policy and a necessary measure to improve the process environment. The main reasons for sludge generation during the lime kiln flue gas desulfurization process are: First, the desulfurization wastewater contains high concentrations of suspended solids, sulfates, heavy metals (such as mercury, cadmium, and arsenic), COD, and fluorides, which precipitate to form sludge during treatment. Second, in the lime kiln flue gas desulfurization process, the addition of agents such as calcium hydroxide, polyaluminum ferric sulfate, and organic sulfur causes heavy metals and suspended solids to flocculate and settle, generating a large amount of sludge. Because a large amount of sludge is generated during the lime kiln flue gas desulfurization process, sludge treatment is necessary. Currently, the main method for treating lime kiln desulfurization sludge is to use a filter press to filter the sludge into a cake, thereby achieving solid-liquid separation of the lime kiln flue gas desulfurization sludge.

[0003] Currently, traditional filter presses consist of a thrust plate, main beam, pressing mechanism, frame, and a filtration unit composed of a pressing plate placed on the main beam of the frame, several filter plates, and filter cloth laid on their surface. During operation, the pressing or tensioning device first pushes or pulls the pressing plate to press the filtration unit between the pressing plate and the thrust plate, forming several well-sealed filter chambers. Then, a matching feed pump forces the suspension to be filtered into the filter chambers through a pipeline connected to the feed inlet of the thrust plate. The liquid phase in the suspension passes through the filter cloth to form filtrate, which is discharged from the filtration unit through the filtrate channels on the filter plates. The solid phase in the suspension is trapped in the filter chambers by the filter cloth to form a filter cake, thus separating the liquid and solid phases in the suspension and completing the filtration process. When all filter chambers are filled with filter cake and the suspension filtration operation is completed, the pressing or tightening device releases the pressing plate, and the filter plates are pulled open one by one manually or automatically via a plate-pulling device. The filter cake falls out of the open filter chambers under gravity, and one work cycle is completed after all filter chambers are unloaded. The main technical problem in the existing technology is that after the filter chambers of the filter press are filled with filter cake, the filter plates need to be pulled open one by one manually or via a plate-pulling device, and then the sludge filter cake falls out of the filter press chambers by its own gravity, completing the sludge filter cake unloading work. This makes the sludge filter cake unloading operation relatively inefficient and cannot achieve one-time unloading of the sludge filter cake. Based on the above-mentioned technical defects in the existing technology, the inventor has developed an equidistant extension device for filter plates of a filter press for desulfurization sludge in lime kilns, which can effectively solve the above-mentioned technical problems in the existing technology. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, this utility model provides an equidistant extension device for filter plates of a filter press for desulfurization sludge in lime kilns. The structure of this utility model is scientifically and rationally designed and simple, which can solve the technical problem that the existing technology cannot achieve one-time unloading of sludge filter cake.

[0005] The technical solution adopted in this utility model is as follows: an equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln, comprising a support, a sliding rod, and a hydraulic cylinder. The support is a hollow square shape. The sliding rod is symmetrically fixed on the front and rear sides of the upper part of the support. The hydraulic cylinder is fixedly mounted on the upper middle position of the left side of the support through a fixed flange. The telescopic rod of the hydraulic cylinder extends through the support body into the interior of the support. A pressure plate is fixedly mounted on the right end of the telescopic rod of the hydraulic cylinder, and a pressure plate is fixedly mounted on the right end face of the pressure plate. A sliding body is fixedly mounted on the middle position of the front and rear sides of the frame filter plate. The sliding body includes a sliding body body, which is L-shaped. An arc-shaped groove is opened at the bottom of the sliding body body. The frame filter plate is mounted on the sliding rod through the arc-shaped groove on the front and rear sides, and can slide left and right on the sliding rod. A thrust plate is fixedly mounted on the upper part of the inner right side of the support. The thrust plate and the pressure plate are connected. The support is arranged in a left-right correspondence; the fixing body is fixedly installed in the middle of the front and rear sides of the thrust plate, and the thrust plate is fixedly installed on the sliding rod through the fixing body; the filter water discharge pipe is fixedly installed in the front and rear sides of the bottom of the frame filter plate, and the filter water discharge pipe is connected to the inside of the frame filter plate; the sludge pipe is fixedly installed in the middle of the upper right side of the support, and the sludge pipe passes through the support body and the thrust plate, and the hot air inlet pipe is located in the front side of the right end of the sludge pipe; the filter plate backwash pipe one is fixedly installed in the upper part of the support, and the filter plate backwash pipe two is fixedly installed in the lower part of the support; the lifting and equidistant extension mechanism is fixedly installed in the front and rear sides of the support respectively, and the lifting and equidistant extension mechanism realizes the one-time extension action of the frame filter plate through the lifting action; the water receiving tank is fixedly installed in the bottom position of the support, and the water receiving tank is used to collect the water separated by the frame filter plate, and at the same time, it is used to unload the sludge cake formed after the frame filter plate is extended through the water receiving tank.

[0006] The center-to-center distance between the front and rear of the sliding rod is equal to the center-to-center distance between the arc-shaped grooves of the sliding body provided on the front and rear sides of the frame filter plate.

[0007] The hydraulic cylinder is fixedly connected to the hydraulic solenoid valve and the pump outlet of the hydraulic station via oil pipes.

[0008] The frame-type filter plate includes a filter frame, which is a hollow square shape. A filter plate is installed inside the filter frame. The left and right sides of the filter plate are concave. The concave surfaces of the left and right sides of the filter plate are evenly provided with longitudinal guide grooves. A central hole is provided in the center of the filter plate. The filter cloth passes through the central hole and is fixedly covered on the left and right sides of the filter plate. Through holes are provided at the four corners of the filter frame.

[0009] The guide grooves on the recessed surfaces of the left and right sides of the filter plate are connected to the water discharge pipe and through holes.

[0010] The sludge pipe is fixedly connected to the outlet of the sludge pump via an electromagnetic control valve, and is used to transport sludge into the frame filter plate.

[0011] The hot air inlet pipe is connected to the sludge pipe, and a solenoid valve is fixedly installed at the front end of the hot air inlet pipe. The hot air inlet pipe is also fixedly connected to the waste heat recovery pipe of the lime kiln.

[0012] The filter plate backwash pipe 1 and filter plate backwash pipe 2 consist of a main pipe and two branch pipes. The two branch pipes of filter plate backwash pipe 1 and filter plate backwash pipe 2 pass through the four corners of the support body and the thrust plate and are flush with the left side of the thrust plate. Solenoid valves are respectively installed at the lower end of the main pipe of filter plate backwash pipe 1 and filter plate backwash pipe 2.

[0013] The lifting and equidistant extension mechanism includes a slide rail, which is vertically fixed on the front and rear columns on the left side of the support. The slider is slidably mounted on the slide rail. The linear module is vertically fixed on the front and rear columns on the right side of the support. The slider is mounted on the lead screw of the linear module through a threaded hole. The equidistant extension plate is a rectangular shape with rounded corners. Fixed plates are fixed on the left and right end faces of the equidistant extension plate. The left fixed plate of the equidistant extension plate is fixedly connected to the outer side of the slider. The left fixed plate of the equidistant extension plate is fixedly connected to the outer side of the slider. Inclined grooves are evenly and equidistantly cut on the side of the equidistant extension plate. The number of inclined grooves corresponds to the number of frame filter plates. The variable pitch rod is fixedly set at the middle position on the outer side of the slider body. The outer end of the variable pitch rod has an external thread. The variable pitch rod passes through the inclined groove and is tightened by a nut.

[0014] The water receiving trough includes a water receiving trough body, which is square in shape. The water trough is arranged around the water receiving trough body, and the sludge filter cake drop outlet is opened at the center of the water receiving trough body. The sludge filter cake drop outlet is vertically aligned with the bottom of the frame filter plate.

[0015] The working process of the equidistant extension device for filter plates in a filter press for desulfurization sludge from lime kilns is as follows: First, align the arc-shaped grooves of the sliding bodies on both sides of the frame filter plate with the sliding rods and install them on the symmetrically arranged sliding rods (the number of frame filter plates installed is determined by the thickness of the frame filter plate and the distance between the pressing plate and the thrust plate when the hydraulic cylinder telescopic rod reaches its maximum extension stroke). Then, turn on the servo motors of the hydraulic cylinder and the linear module. The telescopic rod of the hydraulic cylinder begins to extend, pushing the pressing plate and the pressing plate to the right. When the telescopic rod of the hydraulic cylinder extends to its maximum stroke, it squeezes all the frame filter plates into a whole. At the same time, as the telescopic rod of the hydraulic cylinder extends, the linear module set on the front and rear sides of the right column of the support begins to rise. With the cooperation of the sliding body and the linear module, the sliding cooperation between the slider and the slide rail causes the equidistant extension plate to move upward at a synchronous speed with the telescopic rod of the hydraulic cylinder. When the linear module rises to its maximum stroke, the extension plate drives the pitch rod. Moving upwards along the inclined groove, driven by the sliding action of the variable pitch rod, all the frame filter plates move to the right along the sliding rod through the arc-shaped groove of the sliding body. Under the squeezing action of the hydraulic cylinder extension rod, all the frame filter plates become one piece. At this time, the center holes of all the frame filter plates align to form a sludge conveying and injection channel, and the through holes on the four corners of the filter frame align to form a channel for reverse cleaning of the filter cloth. Then, the solenoid valve of the sludge pump is turned on to transport the sludge through the sludge pipe into the sludge conveying and injection channel formed by the alignment of the center holes of all the frame filter plates. Through the filtration action of the filter cloth, the sludge is filtered into the recesses of the filter plates. In the process, sludge cakes are formed, and the filtered water is discharged through the filter water discharge pipe into the water collection tank for centralized collection. After all the frame filter plates are filled with water, the sludge pump solenoid valve is closed. At this time, the solenoid valve on the hot air inlet pipe is opened, allowing the waste hot air from the lime kiln to enter the frame filter plates through the sludge pipe to dry the formed sludge cakes and further remove moisture. After the hot air drying is completed, the solenoid valve on the hot air inlet pipe is closed. Finally, the hydraulic cylinder is restarted, and the extension rod of the hydraulic cylinder begins to retract to the left. When the extension rod of the hydraulic cylinder drives the pressing plate and the pressing plate to their limit of retraction... During the process, the linear module of the lifting and equidistant extension mechanism is activated again. The linear module begins to descend. With the cooperation of the sliding body and the linear module, the sliding cooperation between the slider and the slide rail causes the equidistant extension plate to descend. During the descent of the equidistant extension plate, the variable pitch rod moves down to the lower left along the inclined groove, thereby causing the arc-shaped groove of the sliding body to move along the sliding rod and extend the frame filter plate to the left at equal intervals. At this time, the sludge cake formed between the two frame filter plates falls automatically through the sludge filter cake discharge port of the water receiving tank into the conveyor under the action of gravity and is transported to the next processing step. When it is necessary to reverse clean the filter cloth of the frame filter plate, the solenoid valves on the filter plate backwash pipe one and filter plate backwash pipe two are opened, and clean water is injected into the frame filter plate to reverse clean the filter cloth. The cleaning water is discharged into the water receiving tank through the filter water discharge pipe for collection.

[0016] The beneficial effects of this utility model are as follows: by setting up a lifting and equidistant extension mechanism, the frame filter plate can be extended at one time under the lifting and lowering cooperation of the lifting and equidistant extension mechanism, so that the sludge cake formed by filtration can be unloaded at one time, thereby improving the unloading efficiency of sludge filter cake. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 Schematic diagram of the structure from the side view;

[0019] Figure 3 This is a schematic diagram of the frame filter plate of this utility model;

[0020] Figure 4 This is a schematic diagram of the lifting and equidistant extending mechanism of this utility model;

[0021] The diagram is labeled as follows: 1. Support, 2. Sliding rod, 3. Hydraulic cylinder, 4. Pressing plate, 5. Pressing plate, 6. Frame filter plate, 61. Filter frame, 62. Filter plate, 63. Filter cloth, 64. Center hole, 65. Through hole, 7. Thrust plate, 8. Sliding body, 81. Sliding body body, 82. Arc groove, 9. Fixed body, 10. Filter water discharge pipe, 11. Sludge pipe, 12. Hot air inlet pipe, 13. Filter plate backwash pipe one, 14. Filter plate backwash pipe two, 15. Lifting and equidistant extension mechanism, 151. Slide rail, 152. Slider, 153. Linear module, 154. Sliding body, 155. Equidistant extension plate, 156. Inclined groove, 157. Variable pitch rod, 16. Water receiving tank, 161. Water receiving tank body, 162. Water tank, 163. Sludge filter cake drop outlet. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0023] This utility model provides an equidistant extension device for filter plates of a filter press used for desulfurization sludge in lime kilns:

[0024] like Figure 1 or Figure 2 As shown, the hydraulic cylinder 3 is fixedly installed at the middle position of the upper left side of the bracket 1 through a fixed flange. The telescopic rod of the hydraulic cylinder 3 extends through the body of the bracket 1 into the interior of the bracket 1. The pressure plate 4 is fixedly installed at the right end of the telescopic rod of the hydraulic cylinder 3, and the pressure plate 5 is fixedly installed on the right end face of the pressure plate 4.

[0025] The aforementioned arrangement of hydraulic cylinder 3, pressing plate 4, and pressing plate 5 utilizes the telescopic force of the hydraulic cylinder 3's telescopic rod to compress the frame filter plates 6 into an integral structure. On one hand, this creates recessed cavities between the frame filter plates 6 to filter sludge, enabling solid-liquid separation of the desulfurization sludge from the lime kiln flue gas using filter cloth 63. On the other hand, the compression and connection of the central holes on all the frame filter plates 62 form a sludge conveying and injection channel. Furthermore, the compression and connection of the through holes 65 at the four corners of all the frame filter plates 61 form a channel for reverse cleaning of the filter cloth 63.

[0026] like Figure 1 As shown in Figure 2, a sliding body 8 is fixedly installed at the middle position of the front and rear sides of the frame filter plate 6. The sliding body 8 includes a sliding body body 81, which is L-shaped. An arc-shaped groove 82 is provided at the bottom of the sliding body body 81. The frame filter plate 6 is installed on the sliding rod 2 through the arc-shaped groove 82 on the front and rear sides, and can slide left and right on the sliding rod 2.

[0027] The main purpose of the above configuration is as follows: Firstly, it allows the frame filter plates 6 to move left and right on the sliding rod 2, and uses the hydraulic cylinder 3 to compress all the frame filter plates 6 into a single structure; secondly, it facilitates the installation of the frame filter plates 6 (when the filter cloth 63 is damaged, the frame filter plates 6 can be removed and the filter cloth 63 replaced); and thirdly, with the lifting and lowering coordination of the lifting and equidistant extending mechanism 15, the frame filter plates 6 can be extended at one time, so that the sludge cake formed by filtration can be unloaded at one time.

[0028] like Figure 1 As shown in Figure 2, the thrust plate 7 is fixedly installed on the upper part of the inner side of the right side of the bracket 1, and the thrust plate 7 and the clamping plate 5 are arranged in a left-right correspondence; the fixing body 9 is fixedly installed in the middle of the front and rear sides of the thrust plate 7, and the thrust plate 7 is fixedly installed on the sliding rod 2 through the fixing body 9.

[0029] The main purpose of the above arrangement is to provide a clamping effect on the frame filter plate 6 when it is compressed into an integral structure by setting the thrust plate 7 and the fixing body 9.

[0030] like Figure 1 , 2 As shown in Figure 3, the water discharge pipe 10 is fixedly installed on the bottom front and rear sides of the frame filter plate 6, and the water discharge pipe 10 is connected to the interior of the frame filter plate 6; the guide grooves on the concave surface of the left and right sides of the filter plate 62 are connected to the water discharge pipe 10 and the through hole 65.

[0031] The aforementioned water discharge pipe 10 allows the water after solid-liquid separation of sludge to be discharged through the water discharge pipe 10, thus achieving solid-liquid separation of sludge from lime kiln flue gas desulfurization.

[0032] like Figure 1 As shown, the sludge pipe 11 is fixedly installed at the middle position of the upper right side of the support 1. The sludge pipe 11 passes through the support 1 body and the thrust plate 7. The sludge pipe 11 is fixedly connected to the outlet of the sludge pump through an electromagnetic control valve. The sludge pipe 11 is used to transport sludge into the frame filter plate 6. The main purpose of this arrangement is to use the sludge pipe 11 to transport the flue gas desulfurization sludge to the channel formed by the connection of the central holes 64 of all the frame filter plates 6, and to achieve solid-liquid separation of the flue gas desulfurization sludge through the filtration effect of the filter cloth 63.

[0033] like Figure 1 As shown, the hot air inlet pipe 12 is located at the front side of the right end of the sludge pipe 11. The hot air inlet pipe 12 is connected to the sludge pipe 11, and a solenoid valve is fixedly installed at the front end of the hot air inlet pipe 12. The hot air inlet pipe 12 is also fixedly connected to the waste heat recovery pipe of the lime kiln. The main purpose of this arrangement is to use the hot air inlet pipe 12 to transport the waste heat air from the lime kiln to the frame filter plate 6. On the one hand, this allows for the drying of the desulfurization sludge after solid-liquid separation, further reducing the moisture content of the sludge cake. On the other hand, the energy loss reduced by utilizing the waste heat air from the lime kiln contributes to energy conservation.

[0034] like Figure 1 As shown, filter plate backwash pipe 13 is fixedly installed on the upper part of the support 1, and filter plate backwash pipe 24 is fixedly installed on the lower part of the support 1. Filter plate backwash pipe 13 and filter plate backwash pipe 24 are composed of one main pipe and two branch pipes. The two branch pipes of filter plate backwash pipe 13 and filter plate backwash pipe 24 pass through the four corners of the support 1 body and the thrust plate 7 and are flush with the left side of the thrust plate 7. Solenoid valves are respectively installed at the lower end of the main pipe of filter plate backwash pipe 13 and filter plate backwash pipe 24.

[0035] The main purpose of this setup is to achieve reverse cleaning of the filter cloth 63 of the frame filter plate 6 using filter plate backwash pipe 13 and filter plate backwash pipe 24. On the one hand, this prevents the filter cloth 63 from clogging, and on the other hand, it extends the service life of the filter cloth 63.

[0036] like Figure 1 , 2As shown in Figure 4, the lifting and equidistant extension mechanism 15 is fixedly installed on the front and rear sides of the support 1. The lifting and equidistant extension mechanism 15 realizes the one-time extension action of the frame filter plate 6 through the lifting action. The lifting and equidistant extension mechanism 15 includes a slide rail 151, which is vertically fixed on the front and rear columns on the left side of the support 1. The slider 152 is slidably installed on the slide rail 151. The linear module 153 is vertically fixed on the front and rear columns on the right side of the support 1. The slider 154 is installed on the lead screw of the linear module 153 through a threaded hole. The equidistant extension plate 155 is a rectangular shape with rounded corners. Fixed plates are fixedly installed on the left and right end faces of the equidistant expansion plate 155. The left fixed plate of the equidistant expansion plate 155 is fixedly connected to the outer side of the slider 152, and the left fixed plate of the equidistant expansion plate 155 is fixedly connected to the outer side of the slider 154. Inclined grooves 156 are evenly and equally spaced on the side of the equidistant expansion plate 155. The number of inclined grooves 156 corresponds to the number of frame filter plates 6. The variable pitch rod 157 is fixedly installed at the middle position on the outer side of the slider body 81. The outer end of the variable pitch rod 157 is provided with external thread. The variable pitch rod 157 passes through the inclined groove 156 and is tightened and fixed by a nut.

[0037] The above-mentioned equidistant extension mechanism 15, along with slide rail 151, slider 152, linear module 153, sliding body 154, equidistant extension plate 155, inclined groove 156, and variable pitch rod 157, utilizes the linear module 153 to descend or rise. With the cooperation of the sliding body 154 and the linear module 153, and the sliding cooperation of the slider 152 and the slide rail 151, the equidistant extension plate 155 descends or rises. During the equidistant extension plate 155 descends or rises, it drives the variable pitch rod 157 to move along the inclined groove 156 to the lower left or upper right. This causes the arc-shaped groove 82 of the sliding body 8 to move along the sliding rod 2, extending or pressing the frame filter plates 6 to the left or right at equal intervals. On the one hand, it serves to extend all the frame filter plates 6 at equal intervals at once. On the other hand, in conjunction with the telescopic rod of the hydraulic cylinder 3 and the pressing plate 4 and pressing plate 5, it achieves the pressing movement of all the frame filter plates 6 to the right.

[0038] like Figure 1 As shown in Figure 2, the water receiving trough 16 is fixedly installed at the bottom of the support 1. The water receiving trough 16 is used to collect the water separated by the frame filter plate 6, and at the same time, it is used to unload the sludge cake formed after the frame filter plate 6 is extended through the water receiving trough 16. The water receiving trough 16 includes a water receiving trough body 161, which is square in shape. The water trough 162 is arranged around the water receiving trough body 161, and the sludge filter cake drop outlet 163 is opened at the center of the water receiving trough body 161. The sludge filter cake drop outlet 163 is vertically corresponding to the bottom of the frame filter plate 6.

[0039] The above-mentioned arrangement of water receiving tank 16, water tank 162 and sludge filter cake drop outlet 163 allows the water after solid-liquid separation by frame filter plate 6 to flow into water tank 162 through water discharge pipe 10 and be collected through collection port at the bottom left front side of water receiving tank body 161.

[0040] like Figure 1-4As shown, the working process of the equidistant extension device of the filter plate of the filter press for desulfurization sludge in lime kiln is as follows: First, align the arc-shaped grooves 82 of the sliding bodies 8 set on the front and rear sides of the frame filter plate 6 with the sliding rods 2 and install them on the sliding rods 2 that are symmetrically set on the front and rear sides (the number of frame filter plates 6 installed is determined according to the thickness of the frame filter plate 6 and the distance between the pressing plate 5 and the thrust plate 7 when the hydraulic cylinder 3 telescopic rod has the maximum extension stroke).Then, the servo motors of hydraulic cylinder 3 and linear module 153 are activated. The telescopic rod of hydraulic cylinder 3 begins to extend, pushing the pressing plate 4 and pressing plate 5 to the right. When the telescopic rod of hydraulic cylinder 3 extends to its maximum stroke, it compresses all the frame filter plates 6 into a single unit. Simultaneously, as the telescopic rod of hydraulic cylinder 3 extends, the linear module 153, located on the front and rear sides of the right column of support 1, begins to rise. With the cooperation of slider 154 and linear module 153, and through the sliding cooperation of slider 152 and slide rail 151, the equidistant extension plate 155 moves upward at a synchronized speed with the telescopic rod of hydraulic cylinder 3. When the linear module 153 rises to its maximum stroke, the equidistant extension plate 155 moves upward. The variable pitch rod 157 moves upward along the inclined groove 156. Under the sliding action of the variable pitch rod 157, all the frame filter plates 6 move to the right along the sliding rod 2 via the arc-shaped groove 82 of the sliding body 8. Under the squeezing action of the extension rod of the hydraulic cylinder 3, all the frame filter plates 6 become one piece. At this time, the center holes 64 of all the frame filter plates 6 are connected to form a sludge conveying and injection channel, and the through holes 65 on the four corners of the filter frame 61 are connected to form a channel for reverse cleaning of the filter cloth 63. Then, the solenoid valve of the sludge pump is turned on to transport the sludge through the sludge pipe 11 into the sludge conveying and injection channel formed by the connection of the center holes 64 of all the frame filter plates 6. After being filtered by the filter cloth 63, the sludge is filtered onto the filter plates. Sludge cakes are formed in the concave surface. Filtered water is discharged through the filter water discharge pipe 10 into the water tank 162 of the water receiving tank 16 for centralized collection. After all the frame filter plates 6 are filled with no water, the sludge pump solenoid valve is closed. At this time, the solenoid valve on the hot air inlet pipe 12 is opened, allowing the waste hot air from the lime kiln to enter the frame filter plates 6 through the sludge pipe 11 to dry the formed sludge cakes and further remove moisture from them. After the hot air drying is completed, the solenoid valve on the hot air inlet pipe 12 is closed. Finally, the hydraulic cylinder 3 is restarted, and the telescopic rod of the hydraulic cylinder 3 begins to retract to the left. When the telescopic rod of the hydraulic cylinder 3 drives the pressing plate 4 and the pressing plate 5 to their limit of retraction, the lifting and equidistant operation is restarted. The linear module 153 of the extending mechanism 15 begins to descend. With the cooperation of the slider 154 and the linear module 153, the sliding cooperation of the slider 152 and the slide rail 151 causes the equidistant extending plate 155 to descend. During the descent of the equidistant extending plate 155, the variable pitch rod 157 moves along the inclined groove 156 to the lower left, thereby causing the arc-shaped groove 82 of the slider 8 to move along the sliding rod 2 and extend the frame filter plate 6 to the left at equal intervals. At this time, the sludge cake formed by filtration between the two frame filter plates 6 falls automatically through the sludge filter cake discharge port 163 of the water receiving tank 16 into the conveyor under the action of gravity and is transported to the next processing step.When it is necessary to reverse clean the filter cloth 63 of the frame filter plate 6, open the solenoid valves on the filter plate backwash pipe 13 and the filter plate backwash pipe 24, and inject clean water into the frame filter plate 6 at the same time to reverse clean the filter cloth 63. The cleaning water is discharged through the filter water discharge pipe 10 into the water tank 162 of the water receiving tank 16 for collection.

[0041] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln, comprising a support, a sliding rod, and a hydraulic cylinder. The support is a hollow square shape. The sliding rod is symmetrically fixed on the front and rear sides of the upper part of the support. The hydraulic cylinder is fixedly mounted on the upper middle position of the left side of the support via a fixed flange. The telescopic rod of the hydraulic cylinder extends through the support body into the interior of the support. A pressure plate is fixedly mounted on the right end of the telescopic rod of the hydraulic cylinder, and the pressure plate is fixedly mounted on the right end face of the pressure plate. The device is characterized in that: A sliding body is fixedly installed at the middle of the front and rear sides of the frame filter plate. The sliding body includes a sliding body body, which is L-shaped and has an arc-shaped groove at its bottom. The frame filter plate is mounted on the sliding rod through the arc-shaped groove on the front and rear sides, allowing it to slide left and right on the sliding rod. A thrust plate is fixedly installed at the upper part of the inner right side of the bracket, and the thrust plate and the clamping plate are arranged correspondingly on the left and right. A fixing body is fixedly installed at the middle of the front and rear sides of the thrust plate, and the thrust plate is fixedly installed on the sliding rod through the fixing body. The filter water discharge pipe is fixedly installed at the front and rear sides of the bottom of the frame filter plate, and the filter water discharge pipe is connected to the interior of the frame filter plate. The support structure is as follows: A sludge pipe is fixedly installed at the upper middle position of the right side of the support, passing through the support body and the thrust plate. A hot air inlet pipe is located at the front side of the right end of the sludge pipe. A filter plate backwashing pipe (first type) is fixedly installed at the upper part of the support, and a filter plate backwashing pipe (second type) is fixedly installed at the lower part of the support. A lifting and equidistant extension mechanism is fixedly installed on the front and rear sides of the support, and the lifting and equidistant extension mechanism achieves a one-time extension of the frame filter plate through lifting and lowering movements. A water collection tank is fixedly installed at the bottom of the support. The water collection tank is used to collect the water separated by the frame filter plate and to discharge the sludge cake formed after the frame filter plate is extended through the water collection tank.

2. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 1, characterized in that: The center-to-center distance between the front and rear of the sliding rod is equal to the center-to-center distance between the arc-shaped grooves of the sliding body provided on the front and rear sides of the frame filter plate.

3. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 1, characterized in that: The frame-type filter plate includes a filter frame, which is a hollow square shape. A filter plate is installed inside the filter frame. The left and right sides of the filter plate are concave. The concave surfaces of the left and right sides of the filter plate are evenly provided with longitudinal guide grooves. A central hole is provided in the center of the filter plate. The filter cloth passes through the central hole and is fixedly covered on the left and right sides of the filter plate. Through holes are provided at the four corners of the filter frame.

4. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 3, characterized in that: The concave surfaces on the left and right sides of the filter plate have flow channels that connect with the water discharge pipe and through holes.

5. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 1, characterized in that: The filter plate backwash pipe 1 and filter plate backwash pipe 2 consist of a main pipe and two branch pipes. The two branch pipes of filter plate backwash pipe 1 and filter plate backwash pipe 2 pass through the four corners of the support body and the thrust plate and are flush with the left side of the thrust plate. Solenoid valves are respectively installed at the lower end of the main pipe of filter plate backwash pipe 1 and filter plate backwash pipe 2.

6. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 1, characterized in that: The lifting and equidistant extension mechanism includes a slide rail, which is vertically fixed on the front and rear columns on the left side of the support. The slider is slidably mounted on the slide rail. The linear module is vertically fixed on the front and rear columns on the right side of the support. The slider is mounted on the lead screw of the linear module through a threaded hole. The equidistant extension plate is a rectangular shape with rounded corners. Fixed plates are fixed on the left and right end faces of the equidistant extension plate. The left fixed plate of the equidistant extension plate is fixedly connected to the outer side of the slider. The left fixed plate of the equidistant extension plate is fixedly connected to the outer side of the slider. Inclined grooves are evenly and equidistantly cut on the side of the equidistant extension plate. The number of inclined grooves corresponds to the number of frame filter plates. The variable pitch rod is fixedly set at the middle position on the outer side of the slider body. The outer end of the variable pitch rod has an external thread. The variable pitch rod passes through the inclined groove and is tightened by a nut.

7. The equidistant extension device for filter plates of a filter press for desulfurization sludge in a lime kiln according to claim 1, characterized in that: The water receiving trough includes a water receiving trough body, which is square in shape. The water trough is arranged around the water receiving trough body, and the sludge filter cake drop outlet is opened at the center of the water receiving trough body. The sludge filter cake drop outlet is vertically aligned with the bottom of the frame filter plate.

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