Double-push double-discharge type pushing centrifuge with pre-thickening structure

Abstract

The application discloses a double-push double-out type pushing centrifuge with a pre-thickening structure and relates to the technical field of pushing centrifuges. The pushing centrifuge has the advantages of reducing the requirement of the solid-liquid ratio of slurry entering the centrifuge. The technical scheme is as follows: a pre-thickening assembly is arranged in a screen drum, and a feeding pipe is arranged on a product chamber. The feeding pipe feeds slurry into the pre-thickening assembly. After the pre-thickening assembly thickens the slurry, the slurry is distributed in two directions. A driving member drives the pre-thickening assembly to reciprocate in the screen drum. The product chamber is provided with a solid-phase discharging pipe below one side of a rotary drum opening and below a discharging hole.

Description

Technical Field

[0001] This invention relates to the field of pusher centrifuge technology, specifically a double-push double-outlet pusher centrifuge with a pre-thickening structure. Background Technology

[0002] Push-feed centrifuges, as a type of continuously operating filtration centrifuge, have a wide range of applications in the field of solid-liquid separation.

[0003] Currently, existing push-feed centrifuges on the market require a high solid-liquid ratio of slurry entering the centrifuge, with a ratio greater than 40% for optimal results. If the solid-liquid ratio is low, the machine is prone to uneven material distribution and vibration. Therefore, a high solid-liquid ratio is required for the slurry entering the centrifuge.

[0004] Therefore, the applicant has developed a new technical solution in the actual production process to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a double-push, double-outlet pusher centrifuge with a pre-thickening structure, which has the advantage of reducing the solid-liquid ratio requirement of the slurry entering the centrifuge.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention provides a double-push double-outlet centrifuge with a pre-thickening structure, including a product chamber and a drum rotatably connected to the product chamber via a drive component, and a screen cylinder located on the inner wall of the drum. The drum has an opening on one side, and there is a gap between the opening and the vertical wall of the product chamber. The drum has several discharge holes on the side away from the drum opening, and each discharge hole is located on one side of the screen cylinder.

[0008] It also includes a pre-thickening component installed inside the screen cylinder and a feed pipe installed on the product chamber. The feed pipe delivers slurry into the pre-thickening component. After the pre-thickening component thickens the slurry, it performs bidirectional material distribution. The driving component pushes the pre-thickening component to reciprocate within the screen cylinder. The product chamber is provided with a solid phase discharge pipe on one side below the drum opening and below the discharge hole.

[0009] By adopting the above technical solution, after the slurry enters the pre-thickening component from the feed pipe, it is pre-dehydrated by the pre-thickening component to reduce the water content in the slurry. Then, it is discharged bidirectionally by the pre-thickening component and then separated into solid and liquid by the screen cylinder, thereby improving the efficiency of solid-liquid separation of the slurry. With the pre-thickening component, the required solid-liquid ratio of the slurry can be reduced, such as to 25% or 15%. After pre-thickening, some water is filtered out, which is equivalent to increasing the concentration of the slurry and reducing the solid-liquid ratio requirement of the slurry entering the centrifuge. It can also save the pre-thickening equipment in the previous process. Without the pre-thickening component, a pre-thickening device must be added before the centrifuge, which increases costs and energy consumption. In addition, some slurries cannot be thickened by the pre-thickening device. The pre-thickening component of the centrifuge can solve this problem.

[0010] Preferably, the product chamber has an installation port on one side wall facing the drum opening, and a door panel is bolted to the outer wall of the product chamber to close the installation port. The feed pipe is horizontally inserted and fixed to the door panel, and the feed pipe delivers slurry to the pre-thickening component, and the pre-thickening component is slidably connected to the outer wall of the feed pipe.

[0011] Preferably, it also includes an oil tank for storing hydraulic oil, which also functions as a centrifuge base, and a bearing housing is mounted on the oil tank, with the drive component mounted on the bearing housing;

[0012] The driving component includes a hollow shaft that rotates and a push rod shaft that passes through the hollow shaft and performs horizontal linear and rotational movements. The hollow shaft is rotatably connected to a bearing housing, and one end of both the hollow shaft and the push rod shaft extends out of the bearing housing and into the product chamber. The drum is located at the end of the hollow shaft that enters the product chamber. One end of the push rod shaft is provided with a base plate located inside the drum, and one end of the push rod shaft extends out of the drum. The base plate has several support columns, and each support column has a push plate at the end away from the base plate. The pre-thickening component is located on the push plate.

[0013] Preferably, the pre-thickening component includes a baffle plate slidably connected to the feed pipe, the baffle plate having a conical main feeder cover covering the feed pipe, the larger diameter end of the main feeder cover extending out of the feed pipe and the larger diameter end of the main feeder cover having a coaxially arranged annular contact plate, the contact plate being connected to the pusher plate by a plurality of connecting rods, each of the connecting rods being distributed around the periphery of the contact plate, the outer wall of the contact plate contacting the inner wall of the screen cylinder, a gap existing between the outer wall of the pusher plate and the screen cylinder, the feed pipe being closed at one end inside the main feeder cover and having a plurality of discharge holes circumferentially opened on its outer wall, the feed pipe having a coaxially distributed conical feeder plate at the closed end, the larger diameter end of the conical feeder plate extending through the discharge holes;

[0014] The inner wall of the main material feeder cover is provided with annular mounting ring one and mounting ring two, which are connected by a conical screen. The mounting ring two is distributed away from the baffle plate.

[0015] The second mounting ring is equipped with a water distribution cylinder with the same taper as the conical screen. The water distribution cylinder has several water outlet holes in the circumferential direction. The main distributor cover is provided with a main liquid outlet hole corresponding to each water outlet hole.

[0016] An annular guide plate is coaxially fixed at the end of the water distribution cylinder away from the second mounting ring. The inner and outer walls of the guide plate are located on the inner and outer sides of the water distribution cylinder, respectively. A drain hole is opened on the second mounting ring between two adjacent water outlet holes. A guide hole is opened on the guide plate corresponding to each drain hole. Each guide hole is located on one side of the outer wall of the water distribution cylinder. The outer wall of the water distribution cylinder is provided with a partition plate extending to the inner wall of the main distributor cover on both sides of each water outlet hole. The two sides of the partition plate are fixedly connected to the guide plate and the second mounting ring, respectively.

[0017] Preferably, a plurality of reinforcing plates are provided between the first mounting ring and the second mounting ring, which abut against the conical screen. The reinforcing plates are located on the side of the conical screen facing the main distributor cover. When the reinforcing plates are distributed directly opposite the drain holes, the reinforcing plates are located at one end of the second mounting ring, and there is a gap between the reinforcing plates and the second mounting ring.

[0018] Preferably, the diversion plate has several secondary outlet holes on its surface facing the inner wall of the water distribution cylinder. Each secondary outlet hole is located between two adjacent outlet holes. One end of the water distribution cylinder is inserted into the contact plate and there is a gap between it and the inner hole of the annular contact plate. At this time, after the diversion plate is installed on the water distribution cylinder, it is located on the side of the contact plate away from the conical screen and is fixedly connected to the contact plate by bolts. Each diversion hole is located in the inner hole of the contact plate.

[0019] The diversion plate has an annular sealing plate coaxially connected to the pusher plate on the side away from the water distribution cylinder. The sealing plate is located between the diversion hole and the secondary liquid outlet hole.

[0020] The pusher plate has axial holes that are directly opposite each secondary liquid outlet hole. The inner wall of the water distribution cylinder has two partitions located on opposite sides of the water outlet holes. One side of the partition is fixedly connected to the diversion plate.

[0021] Preferably, the inner wall of the flow guide plate is coaxially provided with a material distribution ring extending to the material pusher plate. The material distribution ring is circumferentially provided with material distribution holes located corresponding to each axial hole. The outer diameter of the material distribution ring is smaller than the circular diameter of each axial hole.

[0022] Preferably, the pusher disc is fixedly connected to an annular auxiliary feeder seat on the side away from the contact plate by several connecting rods. The auxiliary feeder seat includes an auxiliary feeder cylinder coaxially distributed with the pusher disc and an contact ring coaxially disposed on the side of the auxiliary feeder cylinder away from the pusher disc. The contact ring is directly opposite the pusher disc and its outer wall is in contact with the inner wall of the screen cylinder. The connecting rods are fixed on the wall of the contact ring, and each of the axial holes is located inside the conical auxiliary feeder cylinder.

[0023] Preferably, the pusher plate is provided with a plurality of connecting rods three extending from the auxiliary material feeder seat. Each of the connecting rods three is connected by an annular baffle ring. There is a gap between the baffle ring and the auxiliary material feeder seat. The outer wall of the baffle ring extends to the inner wall of the abutting ring. The inner wall of the baffle ring extends to each support column and is provided with a groove for each support column to be embedded.

[0024] Preferably, the product chamber has an outer discharge plate on the side of the screen cylinder away from the hollow shaft and an inner discharge plate on the side of the screen cylinder close to the hollow shaft. The two solid discharge pipes on the lower end wall of the product chamber are respectively connected to the outer discharge plate and the inner discharge plate.

[0025] A washing pipe is installed inside the feed pipe. One end of the washing pipe passes through the pusher plate, and the other end is a bent pipe that extends out of the outer wall of the feed pipe. Several washing holes are opened in the washing pipe on the outer wall that passes through the pusher plate.

[0026] The door panel is provided with a second washing pipe. The second washing pipe is located above the feed pipe, with one end of the second washing pipe extending out of the door panel and the other end extending towards the screen cylinder. The second washing pipe is provided with several nozzles that spray towards the inner wall of the screen cylinder.

[0027] The beneficial effects of this invention are as follows: After the slurry enters the pre-thickening component from the feed pipe, it is pre-dehydrated by the pre-thickening component to reduce the water content in the slurry. Subsequently, it is discharged bidirectionally by the pre-thickening component and then separated into solid and liquid by the screen cylinder, thereby improving the efficiency of solid-liquid separation of the slurry. With the pre-thickening component, the required solid-liquid ratio of the slurry can be reduced, such as to 25% or 15%. After pre-thickening, some water is filtered out, which is equivalent to increasing the concentration of the slurry and reducing the solid-liquid ratio requirement for the slurry entering the centrifuge. It can also save the need for the pre-thickening equipment in the previous process. Without the pre-thickening component, a pre-thickening device must be added before the centrifuge, which increases costs and energy consumption. In addition, some slurries cannot be thickened by the pre-thickening device. The pre-thickening component of the centrifuge can solve this problem. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0030] Figure 2 This is a schematic diagram illustrating the structure of the conical screen in this embodiment;

[0031] Figure 3 This is a schematic diagram illustrating the slurry travel trajectory in this embodiment;

[0032] Figure 4 This is a schematic diagram illustrating the structure of the rotating drum in this embodiment;

[0033] Figure 5 This is a schematic diagram illustrating the structure of the pre-thickening component in this embodiment;

[0034] Figure 6 This is a schematic diagram illustrating the structure of the retaining ring in this embodiment;

[0035] Figure 7 This is a schematic diagram illustrating the structure of the drain hole in this embodiment;

[0036] Figure 8 This is a structural schematic diagram illustrating partition two in this embodiment.

[0037] Explanation of reference numerals in the attached figures:

[0038] In the diagram: 1. Product chamber; 11. Drum; 112. Discharge hole; 12. Screen cylinder; 13. Feed pipe; 131. Mounting port; 132. Door panel; 133. Discharge hole; 134. Conical feeding plate; 14. Solid discharge pipe; 15. Oil tank; 151. Bearing seat; 152. Hollow shaft; 153. Push rod shaft; 154. Base plate; 155. Support column; 156. Pusher plate; 16. Baffle plate; 161. Main feeder cover; 162. Contact plate; 163. Connecting rod one; 164. Mounting ring one; 1641. Reinforcing plate; 165. Mounting ring two; 1651 166. Drainage hole; 167. Conical screen; 168. Water distribution cylinder; 169. Partition plate one; 170. Water outlet; 181. Main outlet; 171. Drainage plate; 172. Secondary outlet; 173. Sealing plate; 174. Axial hole; 175. Partition plate two; 176. Material distribution ring; 177. Material distribution hole; 18. Connecting rod two; 181. Auxiliary cloth cylinder; 182. Contact ring; 19. Connecting rod three; 191. Material retaining ring; 2. Outer feed plate; 21. Inner feed plate; 22. Washing pipe one; 221. Bend; 222. Washing hole; 23. Washing pipe two. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] A double-push, double-discharge centrifuge with a pre-thickening structure, such as Figure 1 and Figure 2 and Figure 4 The centrifuge includes a product chamber 1, a rotating drum 11 rotatably connected to the product chamber 1 via a drive component, and a screen cylinder 12 located on the inner wall of the rotating drum 11. The longitudinal section of the rotating drum 11 is U-shaped. An opening is provided on one side of the rotating drum 11, and there is a gap between the opening and the vertical wall of the product chamber 1. Several discharge holes 112 are circumferentially opened on the side of the rotating drum 11 away from the opening. Each discharge hole 112 is located on one side of the screen cylinder 12. The gap and the discharge holes 112 facilitate the bidirectional discharge of solid material in the rotating drum 11. Drainage holes are evenly distributed along the circumferential direction on the rotating drum 11 to facilitate the discharge of water in the rotating drum 11. The product chamber 1 is the space for the centrifuge to perform solid-liquid separation.

[0041] like Figure 1 and Figure 2It also includes a pre-thickening component installed in the screen cylinder 12 and a feed pipe 13 installed on the product chamber 1. The feed pipe 13 conveys slurry into the pre-thickening component. After the pre-thickening component thickens the slurry, it performs bidirectional material distribution. The driving component pushes the pre-thickening component to move back and forth in the screen cylinder 12 so as to push the filtered solid into the gap one or the discharge hole 112. The product chamber 1 is provided with a solid phase discharge pipe 14 below the opening of the drum 11 on one side and below the discharge hole 112.

[0042] like Figure 1 and Figure 2 After the slurry enters the pre-thickening component through the feed pipe 13, it is pre-dehydrated by the pre-thickening component to reduce the water content in the slurry. Then, it is discharged bidirectionally by the pre-thickening component and then separated into solid and liquid by the screen cylinder 12, thereby improving the efficiency of solid-liquid separation of the slurry. With the pre-thickening component, the solid-liquid ratio requirement of the slurry can be reduced, such as 25% or 15%. After pre-thickening, some water is filtered out, which is equivalent to increasing the concentration of the slurry and reducing the solid-liquid ratio requirement of the slurry entering the centrifuge. It can also save the pre-thickening equipment in the previous process. Without the pre-thickening component, a pre-thickening device must be added before the centrifuge, which increases the cost and energy consumption. In addition, some slurries cannot be thickened by the pre-thickening device. The pre-thickening component of the centrifuge can solve this problem.

[0043] like Figure 1 and Figure 2 The product chamber 1 has an installation port 131 on one side wall facing the drum 11. The outer wall of the product chamber 1 is bolted with a door panel 132, which closes the installation port 131. The feed pipe 13 is horizontally inserted and fixed on the door panel 132. The feed pipe 13 delivers slurry to the pre-thickening component, and the pre-thickening component is slidably connected to the outer wall of the feed pipe 13, which facilitates the pre-thickening component to push material while distributing material in both directions.

[0044] like Figure 1 and Figure 2 It also includes a hydraulic oil tank 15, which also functions as a centrifuge base. A bearing housing 151 is mounted on the oil tank 15, the drive component is mounted on the bearing housing 151, and the product chamber 1 is located at one end of the bearing housing 151.

[0045] like Figure 1 and Figure 2 The driving component includes a hollow shaft 152 that rotates and a push rod shaft 153 that passes through the hollow shaft 152 and performs horizontal linear and rotational motion. The hollow shaft 152 is rotatably connected to the bearing housing 151, and one end of both the hollow shaft 152 and the push rod shaft 153 extends out of the bearing housing 151 and into the product chamber 1.

[0046] like Figure 1 and Figure 2The specific connection structure is as follows: the bearing housing 151 contains a front bearing and a rear bearing, which are fixed by the front bearing cover and the rear bearing cover, respectively. The hollow shaft 152 is installed in the front bearing and the rear bearing to facilitate the rotation of the hollow shaft 152. A front shaft sleeve and a rear shaft sleeve are provided between the hollow shaft 152 and the push rod shaft 153. The front shaft sleeve and the rear shaft sleeve are sleeved on the outside of the push rod shaft 153 and are used to support the push rod shaft 153. A bearing housing 151 extends from the end of the hollow shaft 152 furthest from the drum 11, and a hydraulic cylinder pulley is fixedly mounted on the extended end. A hydraulic cylinder cover is mounted on the hydraulic cylinder pulley. Inside the hydraulic cylinder pulley is a compound piston connected to the push rod shaft 153. Under the action of hydraulic oil, the compound piston automatically switches the oil circuit direction and reciprocates under the action of hydraulic oil, thereby driving the push rod shaft 153 to move horizontally reciprocally. A guide key is provided on the inner wall of the hollow shaft 152, and a guide groove is provided on the outer wall of the push rod shaft 153 for the guide key to slide along the length of the push rod shaft 153. However, the connection structure is not limited to the above; any structure that can realize the rotation of the hollow shaft 152 and the horizontal linear and rotational motion of the push rod shaft 153 is acceptable.

[0047] like Figure 1 and Figure 2 The hydraulic cylinder pulley drives the hollow shaft 152 to rotate within the bearing housing 151. The push rod shaft 153 follows the hollow shaft 152 in rotation via a guide key, and simultaneously reciprocates with the compound piston.

[0048] like Figure 1 and Figure 2 The drive unit also includes the following structure: a drum 11 is located at one end of the hollow shaft 152 entering the product chamber 1, a base plate 154 located inside the drum 11 is provided at one end of the push rod shaft 153, one end of the push rod shaft 153 extends out of the drum 11, a number of support columns 155 are on the base plate 154, and a push plate 156 is provided at the end of each support column 155 away from the base plate 154, and a pre-thickening component is provided on the push plate 156.

[0049] like Figure 1 and Figure 2 and Figure 3The pre-thickening component includes a baffle plate 16 slidably connected to the feed pipe 13. The baffle plate 16 is a circular plate, and a conical main feeder cover 161 covering the feed pipe 13 is provided on the baffle plate 16. The end of the main feeder cover 161 with a smaller taper is fixed to the outer wall of the circular plate, and the end of the main feeder cover 161 with a larger diameter extends out of the feed pipe 13. An annular abutment plate 162 is coaxially provided at the end of the main feeder cover 161 with a larger diameter. The abutment plate 162 is distributed parallel to the pusher plate 156 and has a gap with the pusher plate 156. The abutment plate 162 and the pusher plate 156 are connected by several connecting rods 163. A connecting rod 163 is distributed around the contact plate 162. The outer wall of the contact plate 162 contacts the inner wall of the screen cylinder 12. There is a gap between the outer wall of the pusher plate 156 and the screen cylinder 12. This gap facilitates the discharge of pre-filtered liquid. The feed pipe 13 is closed at one end inside the main distributor cover 161 and has several discharge holes 133 circumferentially opened on its outer wall. The feed pipe 13 has a coaxially distributed conical distribution plate 134 at the closed end. The larger diameter end of the conical distribution plate 134 extends through the discharge hole 133. The purpose of the conical distribution plate 134 is to guide the slurry discharged from the discharge hole 133 to the inner wall of the main distributor cover 161.

[0050] like Figure 2 and Figure 3 The inner wall of the main feeder cover 161 is provided with annular mounting ring 164 and mounting ring 165. The mounting ring 164 and mounting ring 165 are connected by a conical screen 166. The conical screen 166 is fixed at the end of the mounting ring 164 and mounting ring 165 away from the inner wall of the main feeder cover 161, so that there is a gap between the conical screen 166 and the inner wall of the main feeder cover 161, which facilitates the flow of pre-filtered liquid. The mounting ring 165 is distributed away from the baffle plate 16. At this time, the conical screen 166 pre-filters and thickens the slurry, and the filtered liquid flows along the conical main feeder cover 161 to the side with a larger diameter.

[0051] like Figure 5 and Figure 6 and Figure 7 and Figure 8The installation ring 165 is equipped with a water distribution cylinder 167 with the same taper as the conical screen 166. The water distribution cylinder 167 has several water outlet holes 168 circumferentially arranged. The main distributor cover 161 has main liquid outlet holes 169 corresponding to each water outlet hole 168. At this time, the purpose of the conical distribution plate 134 is to guide the slurry discharged from the discharge hole 133 to the inner wall of the main distributor cover 161, and then the slurry flows along the conical screen 166 on the inner wall of the main distributor cover 161. The slurry is pre-filtered and then flows to the water distribution cylinder 167. The water outlet 168 on the water distribution cylinder 167 discharges the pre-filtered slurry, which is then discharged through the main liquid outlet 169 to the main distributor cover 161 and flows towards the screen cylinder 12 for secondary filtration. This achieves material distribution on the outside of the pusher plate 156, which is the side of the pusher plate 156 facing the door plate 132. The inner wall of the water distribution cylinder 167 and the inner wall of the conical screen 166 are located on the same conical surface.

[0052] like Figure 5 and Figure 6 and Figure 7 and Figure 8 An annular guide plate 17 is coaxially fixed at the end of the water distribution cylinder 167 away from the mounting ring 165. The inner and outer walls of the guide plate 17 are located on the inner and outer sides of the water distribution cylinder 167, respectively. The mounting ring 165 has drainage holes 1651 located between two adjacent outlet holes 168. The guide plate 17 has guide holes 171 corresponding to each drainage hole 1651. Each guide hole 171 is located on one side of the outer wall of the water distribution cylinder 167. The outer wall of the water cylinder 167 is provided with partitions 1671 extending to the inner wall of the main distributor cover 161 on both sides of each water outlet 168. The two sides of the partitions 1671 are fixedly connected to the diversion plate 17 and the mounting ring 165, respectively. At this time, the two adjacent partitions 1671 seal the water in the water outlet 168 within the two adjacent partitions 1671, so that the water in each water outlet 168 can flow out of the main liquid outlet 169 on the main distributor cover 161.

[0053] like Figure 5 and Figure 6 and Figure 7 and Figure 8 Between mounting ring 164 and mounting ring 165, there are several reinforcing plates 1641 that abut against the conical screen 166. The reinforcing plates 1641 are located on the side of the conical screen 166 facing the main distributor cover 161. When the reinforcing plates 1641 are distributed opposite the drain holes 1651, the reinforcing plates 1641 are located at one end of the mounting ring 165. At this time, there is a gap between the reinforcing plates 1641 and the mounting ring 165, so that the filtered liquid flows out of the conical screen 166 and flows through the drain holes 1651 on the mounting ring 165 to the outer wall of the water distribution cylinder 167, and then through the drainage holes 171 to the side of the contact plate 162 away from the main distributor cover 161, so that it can flow out through the screen cylinder 12.

[0054] like Figure 5 and Figure 6 and Figure 7 and Figure 8 The diversion plate 17 is vertically distributed. Several secondary outlet holes 172 are opened on the plate surface of the diversion plate 17 facing the inner wall of the water distribution cylinder 167. Each secondary outlet hole 172 is located between two adjacent outlet holes 168. One end of the water distribution cylinder 167 is inserted into the contact plate 162 and there is a gap between it and the inner hole of the annular contact plate 162. At this time, the diversion plate 17 is installed on the water distribution cylinder 167 and is located on the side of the contact plate 162 away from the conical screen 166 and is fixedly connected to the contact plate 162 by bolts. Each diversion hole 171 is located in the inner hole of the contact plate 162.

[0055] like Figure 2 and Figure 6 and Figure 7 and Figure 8 The diversion plate 17 has an annular sealing plate 173 coaxially connected to the pusher plate 156 on the side away from the water distribution cylinder 167. The sealing plate 173 is located between the diversion hole 171 and the secondary liquid outlet hole 172. Its purpose is to separate the liquid filtered by the conical screen 166 and the pre-thickened slurry, so that the liquid filtered by the conical screen 166 is discharged from the diversion hole 171 to the outer wall of the sealing plate 173, and the pre-thickened slurry is discharged from the secondary liquid outlet hole 172 into the interior of the sealing plate 173.

[0056] like Figure 2 and Figure 6 and Figure 7 and Figure 8 The pusher plate 156 has axial holes 174 that are directly opposite to each secondary outlet hole 172. The axial holes 174 guide the slurry in the sealing plate 173 to the side of the pusher plate 156 away from the discharge pipe, thereby achieving the inner distribution of the pusher plate 156. The inner wall of the water distribution cylinder 167 is provided with a partition plate 175 located on both sides of the water outlet hole 168. One side of the partition plate 175 is fixedly connected to the guide plate 17. The partition plate 175 facilitates the slurry on the conical screen 166 to pass to the water outlet hole 168. In addition, since each secondary outlet hole 172 is located between two adjacent water outlet holes 168, the partition plate 175 also allows the slurry to pass through the secondary outlet holes 172, thereby achieving the uniform distribution of the slurry on the conical screen 166 to the water outlet hole 168 and the secondary outlet hole 172, that is, achieving the uniform distribution of the slurry on the conical screen 166 to the inner and outer sides of the pusher plate 156.

[0057] like Figure 2 and Figure 8A material distribution ring 176 extending to the pusher plate 156 is coaxially provided on the inner wall of the diversion plate 17. The inner wall of the material distribution ring 176 is flush with the inner wall of the diversion plate 17. The outer wall of the material distribution ring 176 is provided with material distribution holes 177 corresponding to each axial hole 174. The outer diameter of the material distribution ring 176 is smaller than the circular diameter of each axial hole 174. At this time, the material distribution holes 177 will discharge the slurry on one side of the accumulated conical screen 166 into the axial hole 174 through the material distribution holes 177, reducing the accumulation of liquid. In addition, to ensure uniform material distribution on both sides of the pusher plate 156, the size of the secondary liquid outlet 172 can be reduced, so that the amount of slurry discharged from the secondary liquid outlet 172 is less than the amount of slurry discharged from the water outlet 168 on the water distributor 167. The difference is compensated by the slurry discharged from the material distribution hole 177, so that the amount of slurry discharged from the material distribution hole 177 and the secondary liquid outlet 172 is the same as the amount of slurry discharged from the water outlet 168 on the water distributor 167, thereby achieving the purpose of uniform material distribution on both sides of the pusher plate 156.

[0058] like Figure 2 and Figure 6 The pusher plate 156 is fixedly connected to an annular auxiliary feeder seat on the side away from the contact plate 162 by several connecting rods 18. The auxiliary feeder seat includes an auxiliary feed cylinder 181 coaxially distributed with the pusher plate 156 and an contact ring 182 coaxially disposed on the side of the auxiliary feed cylinder 181 away from the pusher plate 156. At this time, the auxiliary feed cylinder 181 can be a conical cylinder or a straight cylinder, preferably a conical cylinder. The end of the auxiliary feed cylinder 181 with a larger diameter is distributed away from the pusher plate 156. The contact ring 182 is directly opposite the pusher plate 156 and externally... The wall of the screen cylinder 166 contacts the inner wall of the screen cylinder 12. At this time, the outer walls of the contact ring 182 and the contact plate 162 both abut against the inner wall of the screen cylinder 12, thus forming a liquid phase discharge space filtered by the conical screen 166. As the pusher plate 156 moves horizontally back and forth, the contact ring 182 and the contact plate 162 push the solid material on the screen cylinder 12 into the gap one and the discharge hole 112 respectively, realizing bidirectional discharge. The connecting rod two 18 is fixed on the wall of the contact ring 182. Each axial hole 174 is located inside the conical auxiliary material distribution cylinder 181. The conical auxiliary material distribution cylinder 181 guides the slurry discharged from the axial holes 174, thus facilitating the flow of the slurry towards the screen cylinder 12.

[0059] like Figure 2 and Figure 6 The pusher plate 156 is provided with several connecting rods 19 extending from the auxiliary feeder seat. Each connecting rod 19 is connected by an annular baffle ring 191. There is a gap between the baffle ring 191 and the auxiliary feeder seat, and the outer wall of the baffle ring 191 extends to the inner wall of the contact ring 182. The inner wall of the baffle ring 191 extends to each support column 155 and has grooves for each support column 155 to be inserted. The baffle ring 191 further guides the slurry flowing out of the auxiliary feeder seat, facilitating the slurry to flow to the screen cylinder 12 for solid-liquid separation.

[0060] Working principle of pre-thickening component:

[0061] Slurry pre-thickening: After the slurry enters through the feed pipe 13, it is guided by the conical feed plate 134 to the side of the inner wall of the main feeder cover 161 with a smaller taper through the discharge hole 133 on the feed pipe 13. This guides the slurry onto the conical screen 166, where it is pre-filtered and some of the liquid phase material is discharged. This is equivalent to increasing the concentration of the slurry and achieving the purpose of slurry pre-thickening.

[0062] Discharge of pre-thickened liquid: The liquid phase in the slurry filtered by the conical screen 166 flows along the inner wall of the main distributor cover 161 towards the mounting ring 165, through the drain hole 1651 on the mounting ring 165 to the outer wall of the water distribution cylinder 167, and then through the drainage hole 171 to the side of the contact plate 162 away from the main distributor cover 161, that is, into the space formed by the contact plate 162, the contact ring 182, the sealing plate 173, the auxiliary distributor cylinder 181, and the screen cylinder 12, thus facilitating the flow of the liquid phase in the slurry filtered by the conical screen 166 through the screen cylinder 12. Figure 3 The C-travel trajectory in the middle;

[0063] Bidirectional material distribution on both sides of the pusher plate 156: The slurry filtered by the conical screen 166 flows along the conical screen 166 towards the water distribution cylinder 167. The water outlet 168 on the water distribution cylinder 167 discharges the pre-filtered slurry, which is then discharged through the main liquid outlet 169 to the main distributor cover 161 and flows towards the screen cylinder 12 for secondary filtration, thus achieving material distribution on the outside of the pusher plate 156. Figure 3 The travel trajectory of A in the middle:

[0064] The secondary outlet 172 discharges the remaining slurry in the water distribution cylinder 167 through the axial hole 174 to the side of the pusher plate 156 away from the feed pipe 13. The distribution hole 177 discharges the slurry accumulated on one side of the conical screen 166 into the axial hole 174, and then onto the side of the pusher plate 156 away from the feed pipe 13. Guided by the auxiliary distributor seat, the slurry inside the pusher plate 156 flows towards the screen cylinder 12, thus achieving the distribution of slurry inside the pusher plate 156. Figure 3 The B-travel trajectory in the middle.

[0065] like Figure 4 The product chamber 1 has an outer discharge plate 2 on the side of the screen cylinder 12 away from the hollow shaft 152, and an inner discharge plate 21 on the side of the screen cylinder 12 close to the hollow shaft 152. The two solid discharge pipes 14 on the lower end wall of the product chamber 1 are connected to the outer discharge plate 2 and the inner discharge plate 21 respectively. The outer discharge plate 2 and the inner discharge plate 21 are used to guide the solid material and reduce material splashing.

[0066] like Figure 1 and Figure 4 The drum 11 has a groove on the side with the screen cylinder 12, which is larger than the drain hole and communicates with it. The purpose of the groove is to accelerate the discharge of the liquid phase. The inner wall of the product chamber 1 is provided with several annular baffles. There is a gap between each baffle and the outer wall of the drum 11. The outer wall of the product chamber 1 is provided with a liquid phase water outlet pipe that communicates with the space between the adjacent baffles. The outer feed plate 2 and the inner feed plate 21 are respectively fixed on the opposite side of the two baffles that are furthest apart. The outer feed plate 2 and the inner feed plate 21 include a semi-arc plate fixed on the baffle plate and a baffle plate set at both ends below the semi-arc plate. The semi-arc plate of the inner feed plate 21 is fitted on the outer wall of the drum 11. The bottom of the two baffle plates extends into the solid phase discharge pipe 14 to facilitate the flow of materials.

[0067] like Figure 1 A washing pipe 22 is installed inside the feed pipe 13. One end of the washing pipe 22 passes through the pusher plate 156, and the other end is provided with a bent pipe 221 that extends out of the outer wall of the feed pipe 13. The washing pipe 22 has several washing holes 222 on the outer wall of the pusher plate 156. Detergent is introduced through the bent pipe 221 and the washing pipe 22, and the detergent is sprayed out through each washing hole 222, which facilitates cleaning of the screen cylinder 12 inside the pusher plate 156.

[0068] like Figure 1 The door panel 132 is equipped with a second washing pipe 23. The second washing pipe 23 is located above the feed pipe 13, with one end extending out of the door panel 132 and the other end extending towards the screen cylinder 12. The second washing pipe 23 is equipped with several nozzles that spray towards the inner wall of the screen cylinder 12. The second washing pipe 23 on the door panel 132 is used to wash the inner wall of the screen cylinder 12 located outside the pusher plate 156 inside the rotating drum 11.

[0069] Traditional pusher centrifuges are not suitable for low-concentration slurries. When the slurry concentration is too low, a filter cake cannot be formed. However, the centrifuge with the above-mentioned technical solution can pre-thicken low-concentration slurries, making the pusher centrifuge suitable for materials with even lower concentrations and expanding the application range of pusher centrifuges.

[0070] A bidirectional pushing structure is adopted, with the pushing disc 156 pushing material in two directions, improving the uniformity of material distribution within the centrifuge. The pushing efficiency is increased to twice the original level, and the centrifuge output is increased to approximately twice that of the traditional unidirectional pushing structure.

[0071] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A double-push, double-discharge centrifuge with a pre-thickening structure, characterized in that, The device includes a product chamber (1) and a rotating drum (11) rotatably connected to the product chamber (1) via a drive component, and a screen cylinder (12) located on the inner wall of the rotating drum (11). The rotating drum (11) has an opening on one side, and there is a gap between the opening and the vertical wall of the product chamber (1). The rotating drum (11) has several discharge holes (112) on the side away from the opening of the rotating drum (11), and each discharge hole (112) is located on one side of the screen cylinder (12). It also includes a pre-thickening component installed in the screen cylinder (12) and a feed pipe (13) installed on the product chamber (1). The feed pipe (13) conveys slurry into the pre-thickening component. After the pre-thickening component thickens the slurry, it performs bidirectional material distribution. The driving component pushes the pre-thickening component to move back and forth in the screen cylinder (12). The product chamber (1) is provided with a solid phase discharge pipe (14) below the opening of the drum (11) on one side and below the discharge hole (112). The pre-thickening component includes a baffle plate (16) slidably connected to the feed pipe (13). The baffle plate (16) is provided with a conical main feeder cover (161) covering the feed pipe (13). The larger diameter end of the main feeder cover (161) extends out of the feed pipe (13), and the larger diameter end of the main feeder cover (161) is coaxially provided with an annular abutment plate (162). The abutment plate (162) is connected to the pusher plate (156) by a plurality of connecting rods (163). Each of the connecting rods (163) 3) Distributed around the periphery of the contact plate (162), the outer wall of the contact plate (162) contacts the inner wall of the screen cylinder (12), there is a gap between the outer wall of the pusher plate (156) and the screen cylinder (12), the feed pipe (13) is closed at one end inside the main feeder cover (161) and has several discharge holes (133) circumferentially opened on the outer wall, the feed pipe (13) has a coaxially distributed conical feed plate (134) at the closed end, and the larger diameter end of the conical feed plate (134) extends through the discharge hole (133). The inner wall of the main feeder cover (161) is provided with annular mounting ring one (164) and mounting ring two (165). The mounting ring one (164) and mounting ring two (165) are connected by a conical screen (166). The mounting ring two (165) is distributed away from the baffle plate (16). The second mounting ring (165) is provided with a water distribution cylinder (167) with the same taper as the conical screen (166). The water distribution cylinder (167) is provided with several water outlet holes (168) in the circumferential direction. The main distributor cover (161) is provided with a main liquid outlet hole (169) corresponding to each water outlet hole (168). An annular guide plate (17) is coaxially fixed at one end of the water distribution cylinder (167) away from the second mounting ring (165). The inner and outer walls of the guide plate (17) are located on the inner and outer sides of the water distribution cylinder (167), respectively. The second mounting ring (165) has a drain hole (1651) located between two adjacent water outlets (168). The guide plate (17) has a guide hole (171) distributed corresponding to each drain hole (1651). Each guide hole (171) is located on one side of the outer wall of the water distribution cylinder (167). The outer wall of the water distribution cylinder (167) has a partition plate (1671) extending to the inner wall of the main distributor cover (161) on both sides of each water outlet (168). The two sides of the partition plate (1671) are fixedly connected to the guide plate (17) and the second mounting ring (165), respectively.

2. The double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 1, characterized in that, The product chamber (1) has an installation port (131) on one side wall facing the opening of the drum (11). The outer wall of the product chamber (1) is bolted with a door plate (132), which closes the installation port (131). The feed pipe (13) is horizontally inserted and fixed on the door plate (132). The feed pipe (13) delivers slurry to the pre-thickening component, and the pre-thickening component is slidably connected to the outer wall of the feed pipe (13).

3. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 2, characterized in that, It also includes a hydraulic oil tank (15) that also functions as a centrifuge base, and a bearing housing (151) is mounted on the oil tank (15), and the drive unit is mounted on the bearing housing (151). The driving component includes a hollow shaft (152) that rotates and a push rod shaft (153) that passes through the hollow shaft (152) and moves horizontally and linearly. The hollow shaft (152) is rotatably connected to a bearing housing (151), and one end of both the hollow shaft (152) and the push rod shaft (153) extends out of the bearing housing (151) and into the product chamber (1). The drum (11) is located at the end of the hollow shaft (152) that enters the product chamber (1). One end of the push rod shaft (153) is provided with a base plate (154) located inside the drum (11). One end of the push rod shaft (153) extends out of the drum (11). The base plate (154) has several support columns (155), and each support column (155) has a pusher plate (156) at the end away from the base plate (154). The pre-thickening component is located on the pusher plate (156).

4. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 3, characterized in that, Between the first mounting ring (164) and the second mounting ring (165), there are several reinforcing plates (1641) that abut against the conical screen (166). The reinforcing plates (1641) are located on the side of the conical screen (166) facing the main feeder cover (161). When the reinforcing plates (1641) are distributed directly opposite the drain hole (1651), the reinforcing plates (1641) are located at one end of the second mounting ring (165), and there is a gap between them.

5. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 4, characterized in that, The diversion plate (17) is provided with several secondary outlet holes (172) on the plate surface facing the inner wall of the water distribution cylinder (167). Each of the secondary outlet holes (172) is located between two adjacent outlet holes (168). One end of the water distribution cylinder (167) is inserted into the contact plate (162) and there is a gap between it and the inner hole of the annular contact plate (162). At this time, after the diversion plate (17) is installed on the water distribution cylinder (167), it is located on the side of the contact plate (162) away from the conical screen (166) and is fixedly connected to the contact plate (162) by bolts. Each of the diversion holes (171) is located in the inner hole of the contact plate (162). The diversion plate (17) has an annular sealing plate (173) coaxially provided on the side away from the water distribution cylinder (167) and fixedly connected to the pusher plate (156). The sealing plate (173) is located between the diversion hole (171) and the secondary outlet hole (172). The pusher plate (156) is provided with an axial hole (174) that is directly opposite to each secondary liquid outlet hole (172). The inner wall of the water distribution cylinder (167) is provided with a partition plate (175) located on both sides opposite to the water outlet hole (168). One side of the partition plate (175) is fixedly connected to the diversion plate (17).

6. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 5, characterized in that, The inner wall of the diversion plate (17) is coaxially provided with a material distribution ring (176) extending to the pusher plate (156). The material distribution ring (176) is circumferentially provided with material distribution holes (177) corresponding to each axial hole (174). The outer diameter of the material distribution ring (176) is smaller than the circular diameter of each axial hole (174).

7. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 6, characterized in that, The pusher plate (156) is fixedly connected to an annular auxiliary feeder seat on the side away from the contact plate (162) by several connecting rods (18). The auxiliary feeder seat includes an auxiliary feeder cylinder (181) coaxially distributed with the pusher plate (156) and a contact ring (182) coaxially disposed on the side of the auxiliary feeder cylinder (181) away from the pusher plate (156). The contact ring (182) is directly opposite the pusher plate (156) and its outer wall is in contact with the inner wall of the screen cylinder (12). The connecting rods (18) are fixed on the wall of the contact ring (182). Each of the axial holes (174) is located inside the conical auxiliary feeder cylinder (181).

8. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 7, characterized in that, The pusher plate (156) is provided with several connecting rods (19) that extend from the auxiliary fabric feeder seat. Each of the connecting rods (19) is connected by an annular baffle ring (191). There is a gap between the baffle ring (191) and the auxiliary fabric feeder seat. The outer wall of the baffle ring (191) extends to the inner wall of the abutment ring (182). The inner wall of the baffle ring (191) extends to each support column (155) and has a groove for each support column (155) to be inserted.

9. A double-push, double-discharge centrifuge with a pre-thickening structure as described in claim 3 or 7, characterized in that, The product chamber (1) has an outer feed plate (2) on the side of the screen cylinder (12) away from the hollow shaft (152) and an inner feed plate (21) on the side of the screen cylinder (12) close to the hollow shaft (152). The two solid discharge pipes (14) on the lower end wall of the product chamber (1) are connected to the outer feed plate (2) and the inner feed plate (21) respectively. The feed pipe (13) is provided with a washing pipe (22). One end of the washing pipe (22) passes through the pusher plate (156), and the other end is provided with a bent pipe (221) that extends out of the outer wall of the feed pipe (13). The washing pipe (22) has several washing holes (222) on the outer wall that passes through the pusher plate (156). The door panel (132) is provided with a second washing pipe (23). The second washing pipe (23) is located above the feed pipe (13) and one end of the second washing pipe (23) extends out of the door panel (132), while the other end extends towards the screen cylinder (12). The second washing pipe (23) is provided with several nozzles that spray towards the inner wall of the screen cylinder (12).

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