A pile wedge type aquaculture sludge hydraulic dewatering machine

Abstract

The present invention proposes a pile-wedge type hydraulic dewatering machine for aquaculture sludge, comprising: a feed system, which is a feed box provided with a feed port; a thrust system, which comprises a thrust cavity provided with a thrust column, which is used to push the aquaculture sludge to move, and a negative pressure valve is provided at the end of the thrust column; a drainage system, which comprises a drainage chamber, which is provided with a plurality of drainage holes, and a drainage net is provided in the drainage chamber, which is used to dehydrate the aquaculture sludge; and a discharge system, which comprises a discharge valve seat, which is used to discharge the dehydrated aquaculture sludge through the opening and closing of the discharge valve seat. The present invention puts the aquaculture sludge into the feed box, and the thrust column pushes the aquaculture sludge into the drainage chamber for dehydration by moving. Under the action of the negative pressure valve, the drainage chamber is under negative pressure, and the drainage net moves toward the aquaculture sludge under the action of the negative pressure to promote the drainage function, and can also prevent the drainage net from being blocked under the action of the negative pressure. Therefore, the present invention achieves a high-efficiency aquaculture sludge dehydration effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge dewatering, and particularly relates to a pile-wedge type hydraulic dewatering machine for aquaculture sludge. Background Art

[0002] With the popularization of livestock and poultry farming, more and more sludge is generated from livestock and poultry farming, and it is necessary to treat the sludge generated from livestock and poultry farming. The method of treating sludge is to first dehydrate the sludge to obtain sewage and cake, and then treat the dehydrated water and cake respectively.

[0003] Currently, in the prior art, when enterprises dehydrate aquaculture sludge with different water contents, they generally adjust the combination of various dewatering devices and dewatering processes to regulate the water content of the outlet sludge, so as to obtain sludge with appropriate water content. However, in the existing sludge dewatering and filtering treatment process, when operating through the drainage net, due to the influence of gravity on the sludge and its impurities, the sludge and impurities are likely to block the drainage net during the dewatering process, and the drainage net needs to be cleaned multiple times. Therefore, the process is complex, the efficiency is low, the water content is high, and the production cost is increased. Summary of the Invention

[0004] The present invention provides a pile-wedge type hydraulic dewatering machine for aquaculture sludge, which solves the above problems.

[0005] The technical solution of the present invention is realized as follows: A pile-wedge type hydraulic dewatering machine for aquaculture sludge, comprising:

[0006] A feeding system, including a feeding box, the feeding box is provided with a feeding port for feeding aquaculture sludge;

[0007] A thrust system, including a thrust chamber, a thrust column is arranged in the thrust chamber for pushing the aquaculture sludge to move, and a negative pressure valve is arranged at the end of the thrust column;

[0008] A drainage system, including a drainage chamber, the drainage chamber is provided with a plurality of drainage holes, and a drainage net is arranged in the drainage chamber for dehydrating the aquaculture sludge;

[0009] A discharging system, including a discharging valve seat, through the opening and closing of the discharging valve seat, for discharging the dehydrated aquaculture sludge.

[0010] The present invention feeds aquaculture sludge into the feeding box through the feeding port and sinks into the thrust chamber. The thrust column moves to push the aquaculture sludge into the drainage chamber for dehydration. Under the action of the negative pressure valve, the drainage chamber is in a negative pressure state. Under the action of the negative pressure, the drainage net moves towards the aquaculture sludge, promoting the drainage function and preventing the drainage net from being blocked under the action of the negative pressure. The dehydrated aquaculture sludge is taken out through the discharging system, realizing high-efficiency dehydration of aquaculture sludge.

[0011] As a preferred embodiment, a reflux pipeline is connected and arranged at the top of the feed box, and a material guiding box is connected and arranged at the bottom of the feed box. The cross-sectional area at the top end of the material guiding box is larger than that at the bottom end of the material guiding box.

[0012] In the present invention, while the aquaculture sludge entering through the feed port is pushed by the thrust column, the continuously poured aquaculture sludge accumulates in the feed box, and the excess aquaculture sludge is discharged through the reflux pipeline. After the thrust column returns to its original position, the falling aquaculture sludge is continuously pushed into the water drainage system for water drainage.

[0013] As a preferred embodiment, the pushing chamber includes:

[0014] A first thrust cavity, inside which a piston rod is provided. A piston is arranged at the tail end of the piston rod, and a first sealing ring is arranged at the head end of the piston rod;

[0015] A second thrust cavity, inside which a pressing rod is provided. The tail end of the pressing rod is connected to the piston rod through a pressing nut, and a negative pressure valve is arranged at the head end of the pressing rod. The second thrust cavity is provided with an inclined pressure relief hole;

[0016] A third thrust cavity, which is connected and arranged at the bottom of the feed box;

[0017] A fourth thrust cavity, from the end close to the third thrust chamber to the end far from the third thrust chamber, its longitudinal cross-sectional area gradually increases;

[0018] The first thrust chamber, the second thrust chamber, the third thrust chamber and the fourth thrust chamber are sequentially connected and arranged through bolts.

[0019] In the present invention, first, in the form of a sealing ring, the sealing performance inside the thrust chamber is ensured, and further the effect of a negative pressure state inside the water drainage chamber is realized. In the present invention, the piston rod is used to push out and return the pressing rod. During the pushing process, the negative pressure valve is in a closed state, and the water drainage chamber is in a negative pressure state. During the return process, the negative pressure valve is in an open state, and under the action of the pressure relief hole, the air pressure returns to the normal state.

[0020] As a preferred embodiment, the water drainage chamber includes a first filter cylinder connecting part and a second filter cylinder connecting part which are integrally connected. The longitudinal cross-sectional area of the second filter cylinder connecting part at the end close to the first filter cylinder connecting part is larger than that at the end far from the first filter cylinder connecting part. The water drainage net is arranged inside the first filter cylinder connecting part, and a plurality of reinforcing ribs are arranged outside the first filter cylinder connecting part. The plurality of reinforcing ribs are connected through longitudinal bars.

[0021] As a preferred embodiment, a water receiving rack is arranged below the first filter cartridge connecting part. The water receiving rack is arranged in an arc shape and is fixedly connected to the reinforcing rib. A drain port is arranged at the bottom end of the water receiving rack, and a water collecting tank is arranged below the drain port.

[0022] In the present invention, the water drained through the water draining holes is led out through the water receiving rack, and the led-out water enters the water collecting tank through the drain port. After the water in the water collecting tank is collected to a certain extent, it is discharged through a pipeline.

[0023] As a preferred embodiment, a cleaning shaft is arranged in the water draining chamber. A cleaning body is arranged spirally along the axial direction on the outer side of the cleaning shaft. The cleaning body includes a first cleaning part and a second cleaning part.

[0024] In the present invention, through the rotation of the cleaning part, it can not only push the breeding sludge in the water draining chamber to move to prevent accumulation, but also clean the water draining net to prevent impurities from blocking the mesh holes of the water draining net.

[0025] As a preferred embodiment, one end of the fourth thrust cavity and the first filter cartridge connecting part is connected through a hinge part, and the other end is connected through a connecting part. The connecting part includes a first connecting piece. The first connecting piece is arranged on the outer side of the first filter cartridge connecting part. A second connecting piece is rotatably arranged on the first connecting piece. A notch is arranged on the outer side of the fourth thrust cavity. The second connecting piece is rotatably clamped into the notch and is fixedly arranged through a nut.

[0026] In the present invention, by opening or closing the connecting part, the water draining net can be replaced. After removing the nut and rotating the second connecting piece, the first filter cartridge connecting part can be opened through the hinge part to replace the water draining net inside it. After the replacement is completed, close the second filter cartridge connecting part, rotate the second connecting piece to insert it into the notch, and screw in the nut for fixation.

[0027] As a preferred embodiment, the discharge valve seat includes a first seat body and a second seat body. A discharge valve plate is arranged inside the first seat body. After the cleaning shaft penetrates through the discharge valve plate, it is fixedly connected between the bearing seat and the second seat body. A discharge top plate is arranged on the outer side of the second seat body. The discharge valve plate and the discharge top plate are connected through a discharge top rod. A discharge baffle is arranged on the outer side of the discharge top plate. The discharge baffle and the second seat body are fixedly connected through a discharge baffle rod. A discharge valve spring is arranged on the outer side of the discharge baffle rod.

[0028] The present invention discharges the dewatered aquaculture sludge through the discharge valve seat. After the aquaculture sludge accumulates, under the action of pressure, the discharge valve plate is pushed out. Under the action of the discharge ejector rod, the discharge valve plate and the discharge top plate move simultaneously, and the dewatered aquaculture sludge is discharged from the outlet. At this time, the discharge valve spring is in a compressed state. When the accumulation degree of the aquaculture sludge is not enough to push the discharge valve plate to move, under the elastic force of the discharge valve spring, the discharge valve plate returns to the initial position, and the outlet of the water drainage chamber is in a closed state.

[0029] As a preferred embodiment, the negative pressure valve includes a negative pressure core shaft. A negative pressure valve seat is arranged between the negative pressure core shaft and the second thrust cavity. A negative pressure baffle is arranged at the tail end of the negative pressure core shaft, and a negative pressure spring is arranged on the outer side of the negative pressure core shaft.

[0030] As a preferred embodiment, the negative pressure core shaft includes a first core shaft connecting portion. The first core shaft connecting portion penetrates through the negative pressure valve seat. The negative pressure baffle is arranged at the tail end of the first core shaft connecting portion. The negative pressure spring is arranged between the negative pressure baffle and the negative pressure valve seat. A second core shaft connecting portion is arranged at the head end of the first core shaft connecting portion, and a second sealing ring is arranged between the second core shaft connecting portion and the negative pressure valve seat.

[0031] The present invention adjusts the pressure through the negative pressure valve. When the thrust column pushes the aquaculture sludge to move, the negative pressure valve is in a closed state. At this time, the second core shaft connecting portion abuts against the negative pressure valve seat, and the sealing effect is achieved through the second sealing ring. At this time, the negative pressure spring is in a compressed state. When the thrust column returns to the initial position, the negative pressure valve is in an open state. At this time, under the elastic force of the negative pressure spring, the second core shaft connecting portion returns to the initial position. The second core shaft connecting portion is far away from the negative pressure valve seat relatively, and under the action of the pressure relief hole, the pressure is balanced.

[0032] After adopting the above technical solutions, the beneficial effects of the present invention are:

[0033] The present invention inputs the aquaculture sludge into the feed box through the feed port and enters the thrust cavity through the guide box. The thrust column moves to push the aquaculture sludge into the water drainage chamber for dewatering. Under the action of the negative pressure valve, the water drainage chamber is in a negative pressure state. Under the action of the negative pressure, the water drainage net moves towards the aquaculture sludge, promoting the water drainage function. It can also prevent the water drainage net from being blocked under the action of the negative pressure. The dewatered aquaculture sludge is taken out through the discharge system, realizing high-efficiency and continuous dewatering of the aquaculture sludge.

[0034] The present invention adjusts the pressure through a negative pressure valve. When the thrust column pushes the aquaculture sludge to move, the negative pressure valve is in a closed state. At this time, the second mandrel connecting portion abuts against the negative pressure valve seat, and the sealing effect is achieved through the second sealing ring. At this time, the negative pressure spring is in a compressed state. When the thrust column returns to the initial position, the negative pressure valve is in an open state. When it returns to the initial position, the second mandrel connecting portion returns to the initial position under the elastic force of the negative pressure spring. The second mandrel connecting portion moves away from the negative pressure valve seat, and under the action of the pressure relief hole, the pressure is balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of the present invention;

[0037] Figure 2 is another schematic structural diagram of the present invention;

[0038] Figure 3 is a schematic cross-sectional structural diagram of the present invention;

[0039] Figure 4 is a schematic structural diagram of the water receiving frame;

[0040] Figure 5 is a schematic structural diagram of the discharge valve seat;

[0041] Figure 6 is a schematic structural diagram of the cleaning body;

[0042] Figure 7 is a schematic structural diagram of the negative pressure valve;

[0043] Figure 8 is another schematic structural diagram of the negative pressure valve.

[0044] In the figure, 1-feeding system; 2-thrust system; 3-drainage system; 4-discharging system; 5-connecting part; 6-hinge part; 10-feeding box; 11-return pipe; 12-material guide box; 13-feeding port; 20-first thrust cavity; 21-second thrust cavity; 22-third thrust cavity; 23-fourth thrust cavity; 24-thrust column; 26-negative pressure valve; 240-piston rod; 241-piston; 243-pressing rod; 244-pressing mother; 260-first mandrel connecting part; 261-second mandrel connecting part; 262-negative pressure valve seat; 263-negative pressure baffle; 264-second sealing ring ;30-drainage chamber;31-drainage hole;32-reinforcement rib;33-longitudinal rib;34-water receiving rack;35-drainage outlet;36-water collecting box;37-cleaning shaft;300-first filter cartridge connection;301-second filter cartridge connection;380-first cleaning part;381-second cleaning part;40-first seat;41-second seat;43-discharge valve plate;44-discharge top plate;45-discharge top rod;46-discharge baffle;47-discharge stop rod;48-discharge valve spring;40-first connection;41-second connection;42-notch;50-first connecting piece;51-second connecting piece. Specific implementation method

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0046] According to Figures 1 to 8 As shown, a pile-wedge type aquaculture sludge hydraulic dewatering machine includes a feeding system 1, which includes a feeding box 10. The feeding box 10 is provided with a feeding port 13 for feeding aquaculture sludge. The top of the feeding box 10 is connected with a return pipe 11, and the bottom of the feeding box 10 is connected with a guide box 12. The cross-sectional area of ​​the top of the guide box 12 is larger than the cross-sectional area of ​​the bottom of the guide box 12.

[0047] The present invention pushes the aquaculture sludge entering from the feed port 13 to drain water, and the continuously poured aquaculture sludge is pushed and accumulated in the feed box 10, and the excess aquaculture sludge is discharged through the return pipe 11. After the thrust column returns to its position, the falling aquaculture sludge is continuously pushed and drained. Therefore, the present invention can automatically realize the continuous input and dehydration of aquaculture sludge.

[0048] The present invention further includes a thrust system 2. The thrust chamber includes a first thrust chamber, a second thrust chamber, a third thrust chamber, and a fourth thrust chamber that are sequentially connected by bolts. A piston rod 240 is provided in the first thrust chamber body 20. A piston is provided at the tail end of the piston rod 240, and a first sealing ring is provided at the head end of the piston rod 240.

[0049] The second thrust chamber body 21 is provided with a pressing rod 243. The tail end of the pressing rod 243 is connected to the piston rod 240 through a pressing nut 244. A negative pressure valve is provided at the head end of the pressing rod 243. The second thrust chamber body 21 is provided with an inclined pressure relief hole. The negative pressure valve includes a negative pressure core shaft. A negative pressure valve seat 262 is provided between the negative pressure core shaft and the second thrust chamber body 21. A negative pressure baffle 263 is provided at the tail end of the negative pressure core shaft, and a negative pressure spring is provided outside the negative pressure core shaft.

[0050] The negative pressure core shaft includes a first core shaft connecting portion 260. The first core shaft connecting portion 260 penetrates through the negative pressure valve seat 262. The negative pressure baffle 263 is provided at the tail end of the first core shaft connecting portion 260. The negative pressure spring is provided between the negative pressure baffle 263 and the negative pressure valve seat 262. A second core shaft connecting portion 261 is provided at the head end of the first core shaft connecting portion 260. A second sealing ring is provided between the second core shaft connecting portion 261 and the negative pressure valve seat 262. The present invention adjusts the pressure through the negative pressure valve. When the thrust column pushes the aquaculture sludge to move, the negative pressure valve is in a closed state. At this time, the second core shaft connecting portion 261 abuts against the negative pressure valve seat 262, and the sealing effect is achieved through the second sealing ring. At this time, the negative pressure spring is in a compressed state. When the pressing rod 243 returns to the initial position, the negative pressure valve is in an open state. At this time, the second core shaft connecting portion 261 returns to the initial position under the elastic force of the negative pressure spring. The second core shaft connecting portion 261 is relatively far from the negative pressure valve seat 262. Under the action of the pressure relief hole, the pressure is balanced.

[0051] The third thrust chamber body 22 is connected to the bottom of the feeding box 10. The aquaculture sludge falling from the material guiding box 12 enters the third thrust chamber body 22 and is pushed into the water drainage chamber by the pressing rod 243. The fourth thrust chamber body 23 has a gradually increasing longitudinal cross-sectional area from the end close to the third thrust chamber to the end far from the third thrust chamber.

[0052] The present invention further includes a water drainage system 3. The water drainage system 3 includes a water drainage chamber 30. The water drainage chamber 30 includes a first filter cartridge connecting portion 300 and a second filter cartridge connecting portion 301 which are integrally connected. The longitudinal cross-sectional area of the second filter cartridge connecting portion 301 at the end close to the first filter cartridge connecting portion 300 is larger than that at the end far from the first filter cartridge connecting portion 300. A water drainage net is arranged inside the first filter cartridge connecting portion 300. A number of reinforcing ribs 32 are arranged outside the first filter cartridge connecting portion 300, and the number of reinforcing ribs 32 are connected by longitudinal bars 33. Under the action of the negative pressure valve, the inside of the water drainage chamber 30 is in a negative pressure state. Under the action of the negative pressure, the water drainage net moves towards the breeding sludge, promoting the water drainage function and preventing the water drainage net from being blocked under the action of the negative pressure.

[0053] The present invention further includes a discharging system 4. The discharging system 4 includes a discharging valve seat. The discharging valve seat includes a first seat body 40 and a second seat body 41. A discharging valve plate 43 is arranged inside the first seat body 40. After the cleaning shaft 37 penetrates through the discharging valve plate 43, it is fixedly connected between the bearing seat and the second seat body 41. A discharging top plate 44 is arranged outside the second seat body 41. The discharging valve plate 43 and the discharging top plate 44 are connected by a discharging top rod 45. A discharging baffle 46 is arranged outside the discharging top plate 44. The discharging baffle 46 and the second seat body 41 are fixedly connected by a discharging baffle rod 47. A discharging valve spring 48 is arranged outside the discharging baffle rod 47.

[0054] The present invention discharges the dehydrated breeding sludge through the discharging valve seat. After the breeding sludge accumulates, under the action of pressure, the discharging valve plate 43 is pushed out. Under the action of the discharging top rod 45, the discharging valve plate 43 and the discharging top plate 44 move simultaneously, and the dehydrated breeding sludge is discharged from the outlet. At this time, the discharging valve spring 48 is in a compressed state. When the accumulation degree of the breeding sludge is not enough to push the discharging valve plate 43 to move, under the elastic force of the discharging valve spring 48, the discharging valve plate 43 returns to the initial position, and the outlet of the water drainage chamber 30 is in a closed state. Embodiment

[0055] According to Figure 4 As shown, a water receiving rack 34 is arranged below the first filter cartridge connecting portion 300 of the present invention. The water receiving rack 34 is arc-shaped. The water receiving rack 34 is fixedly connected to the reinforcing ribs 32. A drain port 35 is arranged at the bottom end of the water receiving rack 34. A water collecting tank 36 is arranged below the drain port 35. The water drained through the drain holes 31 of the present invention is led out through the water receiving rack 34, and the led-out water enters the water collecting tank 36 through the drain port 35. After the water in the water collecting tank 36 is collected to a certain extent, it is discharged through a pipeline.

[0056] One end of the fourth thrust cavity 23 and the first filter cartridge connection part 300 of the present invention is arranged through a hinge part 6, and the other end is arranged through a connection part. The connection part includes a first connecting piece 50. The first connecting piece 50 is arranged outside the first filter cartridge connection part 300. A second connecting piece 51 is rotatably arranged on the first connecting piece 50. A notch is arranged outside the fourth thrust cavity 23. The second connecting piece 51 is rotatably clamped into the notch and fixed by a nut. By opening or closing the connection part, the water drainage net of the present invention can be replaced. After removing the nut and rotating the second connecting piece 51, the first filter cartridge connection part 300 can be opened through the hinge part 6 to replace the water drainage net inside. After the replacement is completed, the second filter cartridge connection part 301 is closed, the second connecting piece 51 is rotated and inserted into the notch, and the nut is screwed in for fixation. Embodiment

[0057] According to Figure 6 As shown, a cleaning shaft 37 is arranged in the water drainage chamber 30 of the present invention. A cleaning body spirally arranged along the axial direction is arranged outside the cleaning shaft 37. The cleaning body includes a first cleaning part 380 and a second cleaning part 381. By rotating the cleaning part, the present invention can not only push the cultured sludge in the water drainage chamber 30 to move to prevent accumulation, but also clean the water drainage net to prevent impurities from blocking the mesh holes of the water drainage net.

[0058] The present invention inputs the cultured sludge into the feed box through the feed port and enters the thrust chamber through the guide box. The thrust column moves to push the cultured sludge into the water drainage chamber for dehydration. Under the action of the negative pressure valve, the inside of the water drainage chamber is in negative pressure. Under the action of the negative pressure, the water drainage net moves towards the cultured sludge to promote the water drainage function and can also prevent the water drainage net from being blocked under the action of the negative pressure. The cultured sludge after water drainage is taken out through the discharge system, realizing high-efficiency and continuous dehydration of the cultured sludge. If it is necessary to adjust the water drainage rate, that is, the moisture content of the discharged material, it can be achieved by adjusting the expansion and contraction degree of the spring.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or can also be the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0060] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pile-wedge type aquaculture sludge hydraulic dewatering machine, characterized in that: include: A feeding system, comprising a feeding box, wherein the feeding box is provided with a feeding port for feeding aquaculture sludge; A thrust system, comprising a thrust chamber, wherein a thrust column is arranged in the thrust chamber for pushing the aquaculture sludge to move, and a negative pressure valve is arranged at the end of the thrust column; A drainage system, comprising a drainage chamber, wherein the drainage chamber is provided with a plurality of drainage holes, and a drainage net is provided in the drainage chamber for dehydrating the aquaculture sludge; A discharge system, comprising a discharge valve seat, which is used to discharge the dehydrated aquaculture sludge through the opening and closing of the discharge valve seat; The thrust chamber comprises: A first thrust cavity is provided with a piston rod, a piston is provided at the rear end of the piston rod, and a first sealing ring is provided at the head end of the piston rod; The second thrust cavity is provided with a squeezing rod, the tail end of the squeezing rod is connected to the piston rod through a squeezing nut, the head end of the squeezing rod is provided with a negative pressure valve, and the second thrust cavity is provided with an oblique pressure relief hole; A third thrust cavity is connected to the bottom of the feed box; The fourth thrust cavity has a longitudinal cross-sectional area that gradually increases from an end close to the third thrust cavity to an end far away from the third thrust cavity; The first thrust chamber, the second thrust chamber, the third thrust chamber and the fourth thrust chamber are sequentially connected by bolts; The negative pressure valve comprises a negative pressure core shaft, a negative pressure valve seat is arranged between the negative pressure core shaft and the second thrust cavity, a negative pressure baffle is arranged at the tail end of the negative pressure core shaft, and a negative pressure spring is arranged on the outer side of the negative pressure core shaft; The negative pressure core shaft includes a first core shaft connecting portion, which passes through the negative pressure valve seat, the negative pressure baffle is arranged at the tail end of the first core shaft connecting portion, the negative pressure spring is arranged between the negative pressure baffle and the negative pressure valve seat, a second core shaft connecting portion is arranged at the head end of the first core shaft connecting portion, and a second sealing ring is arranged between the second core shaft connecting portion and the negative pressure valve seat.

2. A pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 1, characterized in that: The top of the feed box is connected with a return pipe, and the bottom of the feed box is connected with a material guide box, and the cross-sectional area of ​​the top end of the material guide box is larger than the cross-sectional area of ​​the bottom end of the material guide box.

3. A pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 1, characterized in that: The drainage chamber includes a first filter cartridge connecting part and a second filter cartridge connecting part that are integrally connected, the longitudinal cross-sectional area of ​​the second filter cartridge connecting part close to one end of the first filter cartridge connecting part is larger than the longitudinal cross-sectional area of ​​the end away from the first filter cartridge connecting part, the drainage net is arranged on the inner side of the first filter cartridge connecting part, and a plurality of reinforcing ribs are arranged on the outside of the first filter cartridge connecting part, and the plurality of reinforcing ribs are connected by longitudinal ribs.

4. A pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 3, characterized in that: A water receiving frame is arranged below the first filter cartridge connection portion, the water receiving frame is arranged in an arc shape, the water receiving frame and the reinforcing ribs are fixedly connected, a drain outlet is arranged at the bottom end of the water receiving frame, and a water collecting tank is arranged below the drain outlet.

5. The pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 3, characterized in that: A cleaning shaft is arranged in the drainage chamber, and a cleaning body is arranged in a spiral shape along the axial direction on the outer side of the cleaning shaft, and the cleaning body includes a first cleaning part and a second cleaning part.

6. A pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 3, characterized in that: The fourth thrust cavity and the first filter cartridge connecting part are connected by a hinge at one end and connected by a connecting part at the other end. The connecting part includes a first connecting member, which is arranged on the outer side of the first filter cartridge connecting part. A second connecting member is rotatably arranged on the first connecting member. A notch is arranged on the outer side of the fourth thrust cavity. The second connecting member is inserted into the notch by rotation and is fixed by a nut.

7. The pile-wedge type aquaculture sludge hydraulic dewatering machine according to claim 5, characterized in that: The discharge valve seat includes a first seat body and a second seat body, a discharge valve plate is arranged inside the first seat body, after the cleaning shaft passes through the discharge valve plate, it is fixedly connected between the bearing seat and the second seat body, a discharge top plate is arranged outside the second seat body, the discharge valve plate and the discharge top plate are connected by a discharge top rod, a discharge baffle is arranged outside the discharge top plate, the discharge baffle and the second seat body are fixedly connected by a discharge gear rod, a discharge valve spring is arranged outside the discharge gear rod, and the extensibility of the discharge valve spring can be adjusted to control the squeezing pressure of the drainage chamber to obtain different discharge moisture contents.

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