CN104857749B - Double-body type deep dewatering device for sewage sludge - Google Patents

Abstract

The invention discloses a double-body deep dehydration device for sewage sludge. After preliminary dehydration, the sludge with a high water content is sent from a storage bin to a pressure filter cavity by a feeding device. Two deep dehydration sub-devices are used at the same time, each It can independently complete the deep dewatering of sludge, and the efficiency is doubled compared with that of a single dewatering device; during the second deep dehydration, the power transmission mechanism in the extrusion transmission system moves to drive the push-pull plate, thereby driving the first toggle and the second toggle Push it forward to act on the corresponding extrusion plate. In the process of squeezing the sludge, rely on the interaction force of the two sub-devices to achieve mutual extrusion. Only a small external (power transmission mechanism) is required. When the first toggle lever and the second toggle lever are in the same linear position, the most labor-saving stage is reached. As long as the external force maintains the position of the push-pull plate, it can satisfy the deep dehydration of the sludge by high-pressure filtration, so as to obtain low moisture content. sludge.

Description

Two-body sewage sludge deep dewatering device

technical field

The invention relates to the field of sewage sludge treatment, in particular to a two-body sewage sludge deep dehydration device.

Background technique

Sludge is the product of sewage treatment. At present, a large amount of sludge produced after sewage treatment needs further treatment. Dehydration is an important part of sludge treatment. The purpose is to remove most of the water in the sludge, so that the solids are highly enriched. Significantly reducing the volume of sludge to save investment, increasing the calorific value of sludge and saving energy are of great significance for sludge reduction and subsequent disposal. Dehydration can generally be divided into mechanical dehydration and drying dehydration. Drying dehydration consumes a large amount of heat to evaporate the water in the sludge to achieve deep dehydration of sludge. Mechanical dehydration is the most effective dehydration method with the least energy consumption. The deep dehydration of sludge by conditioning and mechanical methods can generally make the moisture content reach 80%-60%.

Mechanical dehydration methods and equipment mainly include belt filter dehydration, centrifugal dehydration, and plate-and-frame filter dehydration. Belt filter dehydration is achieved through flocculation, gravity dehydration, wedge dehydration, low-pressure dehydration, high-pressure dehydration, and extrusion between belts. Continuous dehydration, the moisture content of the dehydrated filter cake is about 75%-80%. Centrifugal dehydration uses the density difference between the solid and liquid phases to separate the solid phase from the liquid phase through the centrifugal acceleration of high-speed rotation to achieve centrifugal sedimentation. The moisture content of the centrifugal dewatering cake is generally about 80%. Plate and frame filter press dehydration uses a screw pump to squeeze the sludge, and the water passes through the filter cloth, while the sludge is in the plate and frame. The pressing pressure is generally 1.6Mpa, and the moisture content of the sludge dehydrated by the diaphragm plate and frame filter press is generally at About 60%. Dehydration equipment also includes disc screw dehydrator and steel belt machine. The disc screw dehydrator uses the filter space formed between the moving ring and the static ring to achieve dehydration, but it is not good at dehydrating sludge with large particles and high hardness. Between 75%-80%.

The ultra-high pressure elastic press is a filter press and solid-liquid separation equipment with higher pressure and higher efficiency. The whole process is mainly divided into four processes: feeding - elastic pressing - receiving liquid - unloading. The first is feed filtration. The feed pump transports the material to the filter chamber, and at the same time, the solid-liquid separation is carried out by the pressure filtration of the feed pump, that is, primary filtration; elastic pressing, one end of the equipment is fixed, and the other end passes through the hydraulic cylinder. External pressure is applied, and the space of the filter chamber is compressed through the elastic force transmission device (spring) for pressing, that is, secondary pressing; the filtrate is discharged, and the filtrate filtered out during the feed filtration and elastic pressing is discharged by moving the liquid receiving plate, which is the next step. Unloading makes space; automatic pull plate, the automatic pull plate mechanism passes through the transmission and pulls the drive chain on the device, the filter cake automatically falls off, and is transported away by the lower transportation equipment. The main equipment includes rack and control system, filter plate and Filter cloth system, automatic plate pulling mechanism, liquid contact mechanism. The pressure of the equipment comes directly from the pressure of the hydraulic cylinder, which is direct pressing, and the pressing pressure can reach 5-7 MPa. The single-batch working cycle is 1.0-1.5 hours, and the working efficiency is 3-4 times that of the diaphragm filter press. The spring of the device needs to withstand alternating loads, and the load is very large, which requires high requirements for the spring. At the same time, the pressure of the device is relatively high, which requires high requirements for the power system.

For a large number of dewatering equipment (belt machines, screw stackers, centrifuges, etc.) currently in use that can dewater sludge to a moisture content of about 80%, all these equipment should be replaced by deep sludge dewatering or ultra-high pressure dewatering For the equipment, the investment is relatively large and it is a relatively large waste for the existing equipment in use. Therefore, it is of great significance to invent a device that can be used in conjunction with these devices to achieve secondary deep dehydration, and it is also an urgent need in reality.

Contents of the invention

In view of this, the present invention aims at the problems of high moisture content, high power requirements and high energy consumption of the treated sludge in the above-mentioned prior art, and provides a low energy consumption, secondary deep dehydration to further reduce sludge Two-body sewage sludge deep dehydration device with high water content.

The technical solution of the present invention is to provide a two-body sewage sludge deep dehydration device with the following structure, including two deep dehydration sub-devices and an extrusion transmission system, and the two deep dehydration sub-devices are symmetrically arranged on the extrusion On both sides of the transmission system, each deep dehydration sub-device includes a cylinder body, a storage bin, an extrusion plate arranged in the cylinder body, and a bottom plate arranged at the bottom of the cylinder body. The filter chamber, the storage bin is located above the filter chamber and communicates with it; the bottom plate is provided with a drainage mechanism for water discharge in the filter chamber; the extrusion transmission system includes a power transmission mechanism, a push-pull plate, the first toggle and the second toggle, the power transmission mechanism is connected with the push-pull plate to drive the push-pull plate to move, one end of the first toggle and the second toggle are respectively hinged on both sides of the push-pull plate , the other ends of the first toggle and the second toggle are respectively hinged on the corresponding extrusion plate;

The deep dehydration device also includes a screw conveying device for feeding, and the screw conveying device includes a first conveying section and a second conveying section, the helical directions of the first conveying section and the second conveying section are opposite, and both The outlets of the feeder correspond to the storage bins of the two deep dehydration sub-devices respectively, and a feed hopper is arranged above the middle of the screw conveying device.

With the above structure, compared with the prior art, the present invention has the following advantages: the sludge with high water content after preliminary dehydration is sent from the storage bin to the filter press cavity by the feeding device, and two deep dehydration sub-devices are used at the same time, each Each sub-device can independently complete the deep dewatering of sludge, and the efficiency is doubled compared with that of a single dewatering device; during the second deep dehydration, the power transmission mechanism in the extrusion transmission system moves to drive the push-pull plate, thereby driving the first toggle and the second The toggle lever is pushed forward to act on the corresponding extrusion plate. In the process of squeezing the sludge, relying on the interaction force of the two sub-devices to achieve mutual extrusion, only the external (power transmission mechanism) is relatively small. Small force, when the first toggle lever and the second toggle lever are in the same straight line position, the most labor-saving stage is reached. As long as the external force maintains the position of the push-pull plate, it can satisfy the high-pressure filtration depth dehydration of the sludge, so as to obtain the moisture content. low sludge.

Preferably, the power mechanism includes a hydraulic motor, a first large gear, a second large gear and a pinion, and the hydraulic motor is connected to the first large gear, the second large gear and the pinion through a gear pair, so The pinion gear is concentrically fixedly connected with the first large gear, and the end of the push-pull plate is hinged to the eccentric position of the second large gear to form a crank linkage mechanism. With this structure, the primary amplification and deceleration of the force is formed through the meshing of the hydraulic motor teeth with the first large gear, and the secondary amplification and deceleration of the force is formed through the pinion and the second large gear. The push-pull plate converts the rotation of the second largest gear into linear motion, and then through the amplifying effect of the push-pull plate and the force of the first and second toggle levers, only a small source of power can be used to achieve ultra-high pressure filtration of sludge.

As a preference, the drainage mechanism includes a plurality of small holes and liquid flow channels for water supply on the bottom plate, the upper surface of the bottom plate is wrapped with filter cloth, one end of the liquid channel is connected to the drain pipe, and the other end is connected to the inlet. The air pipe is connected, and the air intake pipe is connected with a high-pressure gas source. After the filter cloth is used for a period of time, the sludge particles are easy to distribute on the filter cloth and block the mesh, resulting in a decrease in dehydration efficiency. The air intake pipe is used to connect the high-pressure air source with the bottom plate and the filter cloth. After a certain period of use, open the air source and the filter cloth. Open and close the valve, the high-pressure gas will wash away the clogged sludge on the filter cloth without washing with water, and it is very convenient to clean the filter cloth.

As a preference, a material inlet and a material outlet are respectively provided on the upper and lower sides of the cylinder, and a material inlet gate is provided at the described material inlet, a material discharge gate is provided at the described material outlet, and the material inlet and outlet The plates are driven by the ram-propelling cylinders, and the ram-propelling cylinders are in one-to-one correspondence with the inlet and outlet rams. The sludge enters the filter chamber from the feed port through the storage bin. During the press filter, the inlet and outlet rams are closed. After the filter press is completed, the inlet and outlet rams are opened to push the treated sludge out of the outlet.

As a preference, the inner bottom surface of the inlet and outlet is at the same height as the inner bottom surface of the filter chamber, and corresponding gate grooves are provided on the inner bottom surface of the inlet and outlet, and springs and springs are arranged in the gate grooves. The filling plate is fixedly arranged on the upper end of the spring. With this structure, the ram can be inserted into the ram groove. At the same time, when the ram is opened, the filling plate can close the ram groove under the action of the spring, preventing sludge from entering the ram groove and affecting the next operation of the ram. Work.

As a preference, a mud layer dredging structure is installed on the extrusion plate, and the mud layer dredging structure extends inwards into the filter press chamber. After the sludge is squeezed, its pore ratio becomes smaller, and it is easy to block the flow of water, making it difficult to discharge the water, especially under high-pressure filtration, the clogging of the sludge is more serious. The layer forms a flow channel for water, which is easy for water to drain.

Preferably, the mud layer dredging structure is a hollow needle-shaped structure, on which a plurality of through holes are opened, and a layer of filter cloth is covered on the surface of the mud layer dredging structure. This can prevent the blockage of the mud layer dredging structure.

As a preference, the cylinder wall where the extrusion plate moves is a cylindrical structure, and a local variable diameter section is provided on the upper part of the cylinder inner wall, and the inner diameter of the local variable diameter section is larger than the inner diameter of the cylindrical cylinder wall, and is partially This part of the reducing section is equipped with a rotary cylinder that drives the extrusion plate to rotate. The diameter of the other part of the local reducing section in the circumferential direction increases, and the rotating cylinder is arranged on the asymmetrical line of the cylinder, that is, there is an eccentric distance from the center line, so as to provide the torque required to drive the extrusion plate to rotate.

Preferably, the deep dehydration device further includes a first position sensor and a second position sensor, the first position sensor is installed next to the second large gear to detect the rotation position of the second large gear, and the first position sensor The second position sensor is installed at the local variable diameter section to detect the position of the extruded plate.

Description of drawings

Fig. 1 is a schematic structural diagram of a two-body sewage sludge deep dewatering device of the present invention;

As shown in the figure, 1. Cylinder body, 2. Storage bin, 3. Squeeze plate, 4. Bottom plate, 5. Filter chamber, 6. Push-pull plate, 7-1, first toggle lever, 7-2, Second toggle lever, 8, hydraulic motor, 9, first large gear, 10, second large gear, 11, pinion, 12, small hole, 13, liquid flow channel, 14, filter cloth, 15, drainage pipe, 16. Intake pipe, 17. High-pressure air source, 18. Feed inlet, 18-1, Feed gate, 19. Discharge port, 19-1, Discharge gate, 20. Ram push cylinder, 21, Gate groove, 21-1, spring, 21-2, filling plate, 22, mud dredging structure, 23, screw conveying device, 23-1, first conveying section, 23-2, second conveying section, 23 -3. Feed hopper, 24. Local reducing section, 25. Rotary cylinder, 26. First position sensor, 27. Second position sensor.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, for the sake of illustration, the drawings of the present invention are not completely drawn according to the actual scale, and are described here.

As shown in Figure 1, a two-body sewage sludge advanced dewatering device of the present invention includes two deep dehydration sub-devices and an extrusion transmission system, and the two deep dehydration sub-devices are symmetrically arranged on the extrusion transmission system. On both sides, each deep dehydration sub-device includes a cylinder body 1, a storage bin 2, an extruding plate 3 arranged in the cylinder body 1 and a bottom plate 4 arranged at the bottom of the cylinder body 1, and the extruding plate 3 and A filter press cavity 5 is formed between the base plates 4, and the storage bin 2 is positioned above the filter press cavity 5 and communicated with it; the base plate 4 is provided with a drainage mechanism for water discharge in the filter press cavity 5; The extrusion transmission system includes a power transmission mechanism, a push-pull plate 6, a first toggle lever 7-1 and a second toggle lever 7-2, the power transmission mechanism is connected with the push-pull plate 6 to drive the push-pull plate 6 to move, and the One end of the first toggle lever 7-1 and the second toggle lever 7-2 are respectively hinged on both sides of the push-pull plate 6, and the other ends of the first toggle lever 7-1 and the second toggle lever 7-2 are respectively hinged on the corresponding on the extruded plate 3.

The power mechanism includes a hydraulic motor 8, a first bull gear 9, a second bull gear 10 and a pinion 11, and the hydraulic motor 8 and the first bull gear 9, the second bull gear 10 and the pinion 11 all pass through The gear pair is connected, the pinion 11 is concentrically fixedly connected with the first large gear 9, and the end of the push-pull plate 6 is hinged to the eccentric position of the second large gear to form a crank linkage mechanism.

For the design of the push-pull plate, a triangular plate structure can be adopted, especially an isosceles triangular plate, the first toggle 7-1 and the second toggle 7-2 are respectively hinged at two vertices of the bottom edge of the isosceles triangular plate, and the other vertex is hinged at The eccentric position of the second largest gear. Of course, this is only a more preferred example, and is not limited to this example, for example, other linkage mechanisms may also be used.

The drainage mechanism includes a plurality of small holes 12 and liquid flow passages 13 for water supply on the bottom plate 4, the upper surface of the bottom plate 4 is wrapped with a filter cloth 14, and one end of the liquid passage 13 is connected with a drain pipe 15, The other end is connected with the air inlet pipe 16, and the air inlet pipe 16 is connected with the high-pressure gas source 17. After the filter cloth is used for a period of time, the sludge particles are easy to distribute on the filter cloth and block the mesh, resulting in a decrease in dehydration efficiency. The air intake pipe is used to connect the high-pressure air source with the bottom plate and the filter cloth. After a certain period of use, open the air source and the filter cloth. Open and close the valve, and the high-pressure gas will wash away the clogged sludge on the filter cloth.

A feed port 18 and a discharge port 19 are respectively provided on the top and bottom of the cylinder body 1. The feed port 18 is provided with a feed gate 18-1, and the discharge port 19 is provided with a discharge gate. Plate 19-1, the inlet and outlet rams are driven by the ram pushing cylinder 20, and the ram pushing cylinders 20 are in one-to-one correspondence with the inlet and outlet rams. Sealing materials such as rubber can be provided at the lower end of the inlet and outlet gate.

The inner bottom surface of the inlet and outlet is at the same height as the inner bottom surface of the filter chamber 5, and a corresponding gate groove 21 is provided on the inner bottom surface of the inlet and outlet, and a spring 21 is arranged in the gate groove 21 -1 and the filling plate 21-2, the filling plate 21-2 is fixedly arranged on the upper end of the spring 21-1.

It should be noted that terms such as "bottom plate" and "inner bottom surface" mentioned in the present invention are all relative to the extrusion direction of the extrusion plate. Specifically, in the figure, the bottom plates of the two deep dehydration sub-devices Take the position in the figure as the left and right.

A mud layer dredging structure 22 is installed on the extruding plate 3 , and the mud layer dredging structure 22 extends inwards into the filter chamber 5 . The extension length of the mud dredging structure 22 is adjustable, for example, by using a screw adjustment.

The mud layer dredging structure 22 is a hollow needle-shaped structure with a plurality of through holes, and a layer of filter cloth is covered on the surface of the mud layer dredging structure. The mud layer dredging structure 22 can adopt pin needle except adopting above-mentioned structure, offers groove on it, and its end is pointed, and other parts are cylindrical or rectangular.

The deep dehydration device also includes a screw conveying device 23 for feeding, and the screw conveying device includes a first conveying section 23-1 and a second conveying section 23-2, and the first conveying section 23-1 and the second conveying section 23-1 The helical direction of the conveying section 23-2 is opposite, and the outlets of the two correspond to the storage bins 2 of the two deep dehydration sub-devices respectively, and a feed hopper 23-3 is arranged above the middle of the spiral conveying device 23 .

The cylinder wall where the extruding plate 3 moves is a cylindrical structure, and a local variable diameter section 24 is arranged on the upper part of the inner wall of the cylinder body 1, and the internal diameter of the local variable diameter section 24 is larger than the internal diameter of the cylindrical cylinder wall, and is in the This part of the local variable diameter section 24 is equipped with a rotary cylinder 25 that drives the extrusion plate 3 to rotate. The diameter of the other part of the local reducing section in the circumferential direction increases, and the rotating cylinder is arranged on the asymmetrical line of the cylinder, that is, there is an eccentric distance from the center line, so as to provide the torque required to drive the extrusion plate to rotate.

The deep dehydration device also includes a first position sensor 26 and a second position sensor 27, the first position sensor 26 is installed next to the second large gear 10 to detect the rotational position of the second large gear 10, the The second position sensor 27 is installed at the local reducing section 24 to detect the position of the pressing plate 3 .

The process flow of the secondary deep dehydration method of sewage sludge is as follows:

1) After preliminary dehydration, the sludge enters the storage bin, opens the feed port, and is pushed from the storage bin into the filter chamber, keeping the inlet and outlet closed to prepare for the press filter;

2) The first toggle lever and the second toggle lever are driven by the extrusion transmission system, and the first toggle lever and the second toggle lever apply force to the extrusion plates of the two deep dehydration sub-devices respectively, and start to filter the sludge , the water is discharged from the filter chamber by the drainage mechanism;

3) After the dehydration is completed, open the inlet and outlet, and push out the mud cake in the filter chamber

After step 2), as the compression proceeds, the pore ratio of the sludge is already very small at this time, and the water circulation channel is blocked by the sludge, which is not easy to be discharged through the filter cloth. Under the reverse drive of the extrusion transmission system, the extrusion The pressure plate returns to the local variable diameter section of the cylinder, the second position sensor detects the extrusion plate, the controller sends a signal to the extrusion plate rotation cylinder, the cylinder gives the extrusion plate a rotational torque, and the extrusion plate rotates an angle; The hydraulic motor rotates forward again, and drives the extrusion plate to squeeze the filtered sludge again. When the extrusion plate is pushed to the limit position, the force amplification effect is the largest at this time, and the pressure is maintained, and the sewage The mud continues to be filtered under ultra-high pressure for a certain period of time until no water comes out.

For the cleaning of the drainage mechanism, after the water is discharged from the drain pipe, close the valve on the drain pipe, open the valve of the intake pipe, connect the high-pressure air source, and flush the sludge particles blocked by the small holes on the filter cloth and the lower fixing plate.

The specific working principle is as follows:

After preliminary dehydration, the sludge with a high water content (about 80%) enters the screw conveyor through the feed hopper, and under the conveying of the screw conveyor, the left and right sludge enters the two deep dehydration sub-conveyors in equal amounts. In the discharge bin of the device, after a period of accumulation, the gate cylinder works to open the feed gate and close the discharge gate, and the sludge enters the filter chamber under the action of gravity. When the sludge in the storage bin After all the mud enters the filter chamber, the feed gate is closed. The hydraulic motor starts to work, and the hydraulic motor drives the first large gear, the small gear, the second large gear, the triangular plate (a kind of push-pull plate), and the toggle (including the first toggle and the second toggle) in forward rotation to transmit the force On the extrusion plate, at the beginning of compression, due to the relatively large pores of the sludge, the force required for compression is relatively small, but the compression speed is relatively fast. At this time, the force transmission system mainly plays the role of rapid extrusion. The squeeze force is less. As the extrusion proceeds, the sludge is compressed more and more solidly, and the void ratio becomes smaller. At this time, the required compression force becomes larger and larger, and the compression displacement becomes smaller. The triangular plate and the toggle are in a force amplification position, the amplification effect of force begins to appear, only a certain force of the hydraulic motor is needed, and through the two-stage meshing of the large and small gears and the multiple amplification of the force of the triangular plate and the toggle lever, a huge extrusion force is formed at the extrusion plate to carry out the sludge removal process. Press filter. When the compression reaches the second half stage, the pore ratio of the sludge is already very small at this time, and the water circulation channel is blocked by the sludge, which is difficult to discharge through the filter cloth. The hydraulic motor is reversed, driven by the large and small gears, triangular plates, and toggles , the extrusion plate returns to the local variable diameter section of the cylinder, the second position sensor detects the extrusion plate, the controller sends a signal to the extrusion plate rotation cylinder, the cylinder gives the extrusion plate a rotational torque, and the extrusion plate rotates one After the angle is turned, the hydraulic motor rotates forward, and the extrusion plate is re-driven to squeeze the filtered sludge again. At this time, the "small hole" formed by the pin in the first extrusion is provided for the extrusion. The pressurized water circulation channel, the squeezed water can easily pass through the channel through the filter cloth and the small hole to enter the liquid flow channel. This stage is the pressure maintaining stage of the force. At this time, the right toggle, triangular plate, and left toggle are in the "straightening" state , the amplification effect of the force of the extrusion force transmission system is the largest, and the pressure on the sludge is also the largest. The pressure is kept for a certain period of time, and the water in the sludge is continuously squeezed out until no water is squeezed out, and the filter press stops. The discharge gate is opened, and the sludge is discharged from the filter chamber under the action of gravity. The water filtered out by pressure enters the liquid channel through the filter cloth and the small holes on the fixed bottom plate. Under the action of the one-way valve, the liquid can only be discharged from the discharge pipe in one direction. After a period of operation, if sludge particles block the mesh holes of the filter cloth or the small holes of the fixed plate, at this time, open the high-pressure air source and the switch valve of the intake pipe, and close the switch valve at the drain pipe, and the high-pressure gas will filter Wash away the clogged sludge particles on the small holes of the upper and lower fixing plates of the cloth.

The above is only an illustration of the preferred embodiments of the present invention, but should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. In a word, all kinds of changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (9)

1. A two-body sewage sludge deep dehydration device, comprising two deep dehydration sub-devices and an extrusion transmission system, characterized in that: the two deep dehydration sub-devices are symmetrically arranged on both sides of the extrusion transmission system, Each deep dehydration sub-device includes a cylinder body (1), a storage bin (2), an extruding plate (3) arranged in the cylinder body (1) and a bottom plate (4) arranged at the bottom of the cylinder body (1) , a press filter chamber (5) is formed between the squeeze plate (3) and the bottom plate (4), and the described storage bin (2) is located above the press filter chamber (5) and communicated with it; the described The bottom plate (4) is provided with a drainage mechanism for water discharge in the filter chamber (5); the extrusion transmission system includes a power transmission mechanism, a push-pull plate (6), a first toggle (7-1) and a second Two toggle levers (7-2), the power transmission mechanism is connected with the push-pull plate (6) to drive the push-pull plate (6) to move, the first toggle lever (7-1) and the second toggle lever (7 -2) are respectively hinged on both sides of the push-pull plate (6), and the other ends of the first toggle (7-1) and second toggle (7-2) are respectively hinged on the corresponding extrusion plate (3) superior; The deep dehydration device also includes a screw conveying device (23) for feeding, and the screw conveying device includes a first conveying section (23-1) and a second conveying section (23-2), the first conveying section (23-1) and the second conveying section (23-2) have opposite helical directions, and the outlets of the two correspond to the storage bins (2) of the two deep dehydration sub-devices respectively. ) is provided with a feed hopper (23-3) above the middle. 2. The double-body sewage sludge deep dewatering device according to claim 1, characterized in that: the drainage mechanism includes a plurality of small holes (12) for water circulation and liquid flow on the bottom plate (4). channel (13), the upper surface of the bottom plate (4) is wrapped with filter cloth (14), one end of the liquid flow channel (13) is connected to the drain pipe (15), and the other end is connected to the air inlet pipe (16). Intake pipe (16) links to each other with high-pressure gas source (17). 3. The double-body sewage sludge deep dewatering device according to claim 2, characterized in that: the power transmission mechanism includes a hydraulic motor (8), a first large gear (9), a second large gear (10) and the pinion (11), the hydraulic motor (8) is connected with the first bull gear (9), the second bull gear (10) and the pinion (11) through a gear pair, and the pinion (11 ) is fixedly connected concentrically with the first large gear (9), and the end of the push-pull plate (6) is hinged to the eccentric position of the second large gear (10), forming a crank linkage mechanism. 4. The double-body sewage sludge deep dewatering device according to claim 1, characterized in that: a feed port (18) and a discharge port (19) are respectively provided on the top and bottom of the cylinder (1), and the The feed gate (18) is provided with a feed gate (18-1), and the discharge gate (19) is provided with a discharge gate (19-1), and the gate pushes the cylinder (20) drive, and the described ram pushes the cylinder (20) in one-to-one correspondence with the inlet and outlet rams. 5. The double-body sewage sludge deep dewatering device according to claim 4, characterized in that: the inner bottom surface of the inlet and outlet is at the same height as the inner bottom surface of the pressure filter cavity (5), and is located between the inlet and outlet. Corresponding gate grooves (21) are provided on the inner bottom surface, and springs (21-1) and filling plates (21-2) are arranged in the described gate grooves (21), and the described filling plates (21 -2) fixedly arranged on the upper end of the spring (21-1). 6. The double-body sewage sludge deep dewatering device according to claim 2, characterized in that: a mud layer dredging structure (22) is installed on the described extruding plate (3), and the described mud layer dredging structure ( 22) extending inwards into the filter press cavity (5). 7. The dual-body sewage sludge deep dewatering device according to claim 6, characterized in that: the mud layer dredging structure (22) is a hollow needle-shaped structure, on which a plurality of through holes are provided, and in The surface of the mud dredging structure is covered with a layer of filter cloth. 8. The double-body sewage sludge deep dewatering device according to claim 3, characterized in that: the cylinder wall at the moving place of the extruding plate (3) is a cylindrical structure, and the upper part of the inner wall of the cylinder (1) is provided with There is a local variable diameter section (24), the internal diameter of the local variable diameter section (24) is larger than the internal diameter of the cylindrical cylinder wall, and a part of the local variable diameter section (24) is installed to drive the extrusion plate (3) to rotate The rotary cylinder (25). 9. The dual-body sewage sludge deep dewatering device according to claim 8, characterized in that: the deep dewatering device further comprises a first position sensor (26) and a second position sensor (27), and the first position sensor (27) A position sensor (26) is installed next to the second large gear (10) to detect the rotational position of the second large gear (10), and the second position sensor (27) is installed at the local reducing section (24) , to detect the position of the squeeze plate (3).