A hydraulic differential direct-coupled horizontal spiral discharge centrifuge

Abstract

This invention provides a hydraulic differential direct-drive horizontal screw discharge centrifuge, belonging to the technical field of horizontal centrifuges. It includes a base, a centrifuge chamber fixedly connected to the top of the base, an outer drum rotatably connected inside the centrifuge chamber, a filter cloth on the inner wall of the outer drum, and a rotatable screw pusher inside the outer drum. A drive mechanism for rotating the outer drum and screw pusher is located on the top of the base. A screw feeding mechanism is located above the base, on the side of the centrifuge chamber away from the drive mechanism. An annular guide gap is formed between the outer drum and the screw pusher. This invention, through the continuous decrease in both the radial width of the guide gap and the pitch of the screw blades, combined with the wavy blade curved surface structure, allows the material to undergo gradually enhanced compression and dehydration during conveying. Simultaneously, the hydraulic differential direct drive enables stepless adjustment of the differential speed, effectively solving the contradiction between separation effect and discharge efficiency in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of horizontal centrifuge technology, and particularly to a hydraulic differential direct-drive horizontal screw discharge centrifuge. Background Technology

[0002] Horizontal spiral centrifuges, as automated centrifugal equipment with high-speed operation and continuous operation capabilities, work by using centrifugal force to effectively separate solid and liquid phases. They are widely used in chemical, food, pharmaceutical, and mining industries. The centrifuge consists of an outer drum and a spiral feeder inside the drum. Existing horizontal spiral centrifuges primarily use equal-pitch spiral blades for their spiral feeders. During operation, the smaller the speed difference between the outer drum and the spiral feeder, the longer the solid phase resides in the centrifuge, resulting in a drier separated solid phase. However, this reduces the spiral's slag-carrying capacity and output. Conversely, a larger speed difference reduces the solid phase's residence time in the centrifuge and increases its moisture content.

[0003] A search revealed Chinese patent CN201239665Y, which discloses a variable pitch screw conveyor. This patent includes a cylindrical end and a conical end, with helical blades arranged on the outer wall of the screw conveyor from the cylindrical end to the conical end. The pitch between the blades decreases from the starting end to the ending end. By gradually increasing the pushing pressure, the solid material is brought to a high compression state. However, it only provides a single compression action in the axial direction, and the material is not sufficiently compressed during the pushing process, resulting in limited removal of residual water. In addition, when processing viscous and oily materials, an adhesion layer easily forms on the blade surface during the material conveying process, which leads to a decrease in pushing efficiency after long-term operation and an increase in friction, resulting in higher energy consumption. Therefore, this application provides a hydraulic differential direct-drive horizontal screw discharge centrifuge to meet the requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a horizontal screw discharge centrifuge with a hydraulic differential direct coupling to solve the above-mentioned problems. By continuously decreasing the radial width of the guide gap and the screw pitch of the screw blades, combined with the wavy blade surface and the stepless adjustment of the hydraulic differential, the material is subjected to gradually enhanced double compression during the conveying process. While increasing the differential speed, it can still ensure excellent separation effect, solving the problems of differential speed and separation effect being mutually exclusive, insufficient removal of residual water, and easy adhesion of sticky materials to the blades in the background technology.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A hydraulic differential direct-drive horizontal screw discharge centrifuge includes a base, a centrifuge chamber fixedly connected to the top of the base, an outer drum rotatably connected inside the centrifuge chamber, a filter cloth provided on the inner wall of the outer drum, and a screw pusher rotatably disposed inside the outer drum. A drive mechanism for rotating the outer drum and the screw pusher is provided on the top of the base. A screw feeding mechanism is provided above the base and on the side of the centrifuge chamber away from the drive mechanism. An annular guide gap is formed between the outer drum and the screw pusher. The radial width of the annular guide gap decreases continuously from the feed end to the discharge end. The screw pusher includes a cone and multiple screw blades fixedly disposed on its outer wall. The pitch of the multiple screw blades decreases continuously from the feed end to the discharge end. The spiral blade is provided with a wave-shaped curved surface that extends continuously along the spiral direction. The wave-shaped curved surface is composed of continuously alternating troughs and crests.

[0006] Optionally, the drive mechanism includes a transmission box fixed to the top of the base, a differential is provided on one side of the transmission box, the differential has an external output end and an internal output end arranged coaxially, a bushing is fixedly connected to the external output end, a spindle is fixedly connected to the internal output end, the spindle is rotatably inserted inside the bushing, the bushing rotatably passes through the transmission box and the centrifuge box, and the bushing is fixedly connected to the outer drum, the spindle passes through the outer drum and is fixedly connected to the screw feeder.

[0007] Optionally, the drive mechanism further includes a first drive unit and a gearbox mounted on the top of the base. The output shaft of the first drive unit is fixedly connected to the input shaft of the gearbox, and the output shaft of the gearbox is drivenly connected to the input end of the differential. The differential is used to transmit power to the bushing and the spindle respectively.

[0008] Optionally, a lubrication mechanism is provided above the base and on one side of the transmission box. The lubrication mechanism includes an oil tank fixed to the top of the base, and a circulation pump is provided on the top of the oil tank. The oil outlet of the circulation pump is connected to the lubrication oil circuit of the differential for circulating supply of lubricating oil to the differential.

[0009] Optionally, the screw feeding mechanism includes an auger conveyor fixedly mounted above the base and a second driving device for driving the auger conveyor to rotate. The output end of the auger conveyor passes through the centrifuge and extends into the feeding channel of the cone.

[0010] Optionally, a disperser is fixedly installed on the inner wall of the cone near the discharge end of the auger conveyor. The disperser includes a fixed shaft fixedly installed on the inner wall of the cone and multiple distribution discs sleeved on its outer side. The multiple distribution discs are equidistantly spaced along the axial direction of the fixed shaft. The diameter of the distribution discs increases sequentially along the discharge direction of the auger conveyor, and multiple fins are evenly distributed circumferentially on the outer edge of each distribution disc.

[0011] Optionally, the cone has multiple material distribution ports axially opened on its wall. The material distribution ports connect the inside of the cone with the material guide gap and are used to guide the material from the inside of the cone to the material guide gap. Multiple stop plates are axially spaced on the outer wall of the cone and located between two adjacent spiral blades. The stop plates are fixed to the corresponding spiral blades.

[0012] Optionally, multiple spiral blades form multiple spiral channels on the outer wall of the cone. A crushing plate is fixedly installed in the spiral channel at the discharge end of the outer wall of the cone. The crushing plate protrudes outward along the radial direction of the cone and is used to crush the caked filter cake formed after dewatering.

[0013] Optionally, the centrifuge is provided with a liquid outlet at the bottom or side wall, which is connected to the interior of the centrifuge and is used to discharge the separated liquid phase. The centrifuge is provided with a discharge port on the side away from the drive mechanism, which is connected to the discharge end of the guide gap and is used to discharge the separated solid phase.

[0014] Optionally, a backflush pipe is fixedly connected to the top of the inner wall of the centrifuge. The backflush pipe extends along the axial direction of the outer drum. One end of the backflush pipe is used to connect to an external cleaning liquid source. Multiple spray holes are spaced apart along the axial direction at the bottom of the backflush pipe, and the spray holes are set towards the filter cloth for spraying cleaning liquid onto the filter cloth to remove the adhering substances on its surface.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The above-mentioned solution is a horizontal screw discharge centrifuge with a hydraulic differential direct drive provided in this application. By continuously decreasing the radial width of the guide gap and the screw pitch of the screw blades, combined with the wavy blade curved surface structure, the material can be subjected to gradually enhanced compression and dehydration during the conveying process. At the same time, the stepless adjustment of the differential speed is achieved through the direct drive of the hydraulic differential, which effectively solves the contradiction between separation effect and discharge efficiency in the prior art, and can improve the efficiency of solid-liquid separation of materials. Furthermore, the wavy curved surface can generate continuous disturbance during the material pushing process, disrupting the stable contact interface between the material and the blade surface, reducing the stable adhesion effect of sticky materials on the blade surface, and avoiding the accumulation of adhesive layer that leads to decreased pushing efficiency and increased energy consumption. It is worth mentioning that the disperser installed on the inner wall of the cone feed end can forcibly crush the material pushed by the auger conveyor, eliminate the caking formed by the material during the auger conveying process, and allow the material to enter the separation zone in a loose and uniform state. This avoids the problem of material agglomeration causing partial overload or uneven compression of the filter, thereby ensuring the effect of solid-liquid separation of the material. Attached Figure Description

[0016] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of the hydraulic differential direct-drive horizontal screw discharge centrifuge of the present invention; Figure 2 For the present invention Figure 1 A partial sectional view; Figure 3 This is a cross-sectional view of the base, centrifuge box, transmission box, and screw feeding mechanism of the present invention; Figure 4 This is a cross-sectional view of the spiral feeder, the guide gap, and the filter cloth of the present invention; Figure 5 This is a three-dimensional structural diagram of the spiral feeder of the present invention; Figure 6 This is a frontal view of the spiral feeder of the present invention; Figure 7 This is a schematic diagram showing the connection between the spiral feeder and the disperser of the present invention; Figure 8 This is a three-dimensional structural diagram of the disperser of the present invention.

[0018] Figure label: 1. Base; 2. Centrifuge; 201. Liquid outlet; 202. Material outlet; 203. Backflush pipe; 3. Outer drum; 4. Screw feeder; 41. Cone; 42. Screw blade; 421. Valley; 422. Crest; 43. Distribution port; 44. Stop plate; 45. Crushing plate; 5. Guide gap; 6. Filter cloth; 7. Disperser; 71. Fixed shaft; 72. Distribution disc; 73. Fin; 8. First drive unit; 9. Gearbox; 10. Differential; 101. Bushing; 102. Mandrel; 11. Transmission box; 12. Oil tank; 121. Circulating pump; 13. Screw feeding mechanism; 131. Second drive unit; 132. Screw conveyor.

[0019] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0020] The present invention provides a hydraulic differential direct-drive horizontal screw discharge centrifuge with specific embodiments, described in detail below with reference to the accompanying drawings. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0021] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0022] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0023] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0024] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0025] like Figures 1 to 6 As shown, an embodiment of the present invention provides a hydraulic differential direct-drive horizontal screw discharge centrifuge, including a base 1, a centrifuge chamber 2 fixedly connected to the top of the base 1, an outer drum 3 rotatably connected inside the centrifuge chamber 2, a filter cloth 6 disposed on the inner wall of the outer drum 3, and a screw pusher 4 rotatably disposed inside the outer drum 3. An annular guide gap 5 is formed between the outer drum 3 and the screw pusher 4. The radial width of the annular guide gap 5 decreases continuously from the feed end to the discharge end. (Refer to...) Figure 4 T1 and T2, through this design, as the material is pushed from the feed end to the discharge end, the gap gradually narrows, which can gradually increase the radial extrusion force on the filter cake. The screw feeder 4 includes a cone 41 and multiple screw blades 42 fixedly arranged on its outer wall. The pitch of the multiple screw blades 42 decreases continuously from the feed end to the discharge end. (Refer to...) Figure 6 In the F1 and F2 structures, the volume between adjacent blades gradually decreases, which can gradually increase the compressive force on the material in the axial direction. The two decreasing structures apply the squeezing action to the material in the radial and axial directions respectively, and the two are synchronous in time. As the material is pushed towards the discharge end, it is subjected to gradually increasing double squeezing, which in turn forces the residual water to be squeezed out continuously, thus improving the solid-liquid separation effect. It is worth mentioning that the spiral blade 42 is provided with a wave-shaped curved surface that extends continuously along the spiral direction. The wave-shaped curved surface is composed of continuously alternating troughs 421 and crests 422. The crests 422 and troughs 421 of the wave-shaped curved surface can cause continuous disturbance to the material when it flows along the blade surface. The resulting peristaltic effect will destroy the stable interface between the material and the blade surface, and can prevent sticky materials from forming a continuous adhesion layer on the blade surface, so as to ensure the efficiency of solid-liquid separation of materials.

[0026] like Figure 4 and Figure 5 As shown, the centrifuge 2 has a liquid outlet 201 at the bottom or side wall, which is connected to the inside of the centrifuge 2 and is used to discharge the separated liquid phase. The centrifuge 2 has a discharge outlet 202 on the side away from the drive mechanism, which is connected to the discharge end of the guide gap 5 and is used to discharge the separated solid phase. like Figures 1 to 3 As shown, a backflush pipe 203 is fixedly connected to the top of the inner wall of the centrifuge 2. The backflush pipe 203 extends along the axial direction of the outer drum 3. One end of the backflush pipe 203 is used to connect to an external cleaning liquid source. Multiple spray holes are spaced apart along the axial direction at the bottom of the backflush pipe 203, and the spray holes are set towards the filter cloth 6. They are used to spray cleaning liquid onto the filter cloth 6 to remove the adhering substances on its surface. The spray holes are spaced apart and evenly distributed along the axial direction of the backflush pipe 203 to ensure uniform cleaning along the entire length of the filter cloth 6, which can ensure the cleaning effect on the outer drum 3 and the filter cloth 6. A nitrogen filling port, a sampling port and a displacement exhaust port are also provided above the centrifuge 2. The nitrogen filling port is used to fill the centrifuge 2 with nitrogen before the equipment is run to replace the internal air and reduce the oxygen concentration in the centrifuge 2. The sampling port is used to sample and detect the gas composition or liquid phase quality inside the centrifuge 2 in real time during the operation of the equipment, so that the operator can keep track of the separation effect and the atmosphere inside the chamber.

[0027] like Figures 1 to 3 As shown, the top of the base 1 is provided with a drive mechanism for driving the outer drum 3 and the screw feeder 4 to rotate. The drive mechanism includes a transmission box 11 fixed on the top of the base 1. A differential 10 is provided on one side of the transmission box 11. The differential 10 is hydraulically driven and has an outer output end and an inner output end arranged coaxially. A bushing 101 is fixedly connected to the outer output end, and a spindle 102 is fixedly connected to the inner output end. The spindle 102 is rotatably inserted inside the bushing 101. The bushing 101 rotatably passes through the transmission box 11 and the centrifuge box 2. The bushing 101 is fixedly connected to the outer drum 3, and the spindle 102 passes through the outer drum 3 and is fixedly connected to the screw feeder 4. The mechanism also includes a first drive device 8 and a gearbox 9 installed on the top of the base 1. The output shaft of the first drive device 8 is fixedly connected to the input shaft of the gearbox 9. The output shaft of the gearbox 9 is drivenly connected to the input end of the differential 10. The differential 10 is used to transmit power to the bushing 101 and the spindle 102 respectively. The differential 10 divides the single power from the first drive unit 8 into two outputs, which drive the outer drum 3 to rotate through the bushing 101 and the screw feeder 4 to rotate through the spindle 102, respectively, and create a stable speed difference between the outer drum 3 and the screw feeder 4. The first drive unit 8 adopts a direct-drive structure of motor instead of traditional anti-static V-belt transmission. The differential 10 adjusts the displacement of the oil pump through the hydraulic station to change the oil supply flow rate. The flow rate determines the speed of the hydraulic motor inside the differential 10. When the flow rate increases, the differential speed increases, and when the flow rate decreases, the differential speed decreases, thereby achieving stepless adjustment of the differential speed.

[0028] like Figure 1 and Figure 2As shown, a lubrication mechanism is provided above the base 1 and on one side of the transmission box 11. The lubrication mechanism includes an oil tank 12 fixed to the top of the base 1. A circulation pump 121 is provided on the top of the oil tank 12. The oil outlet of the circulation pump 121 is connected to the lubrication oil circuit of the differential 10 and is used to circulate and supply lubricating oil to the differential 10. The oil supply of the circulation pump 121 makes the lubricating oil continuously circulate in the lubrication system inside the differential 10, so as to remove the heat generated during operation in time and ensure the stability of the differential 10.

[0029] like Figures 1 to 3 As shown, a screw feeding mechanism 13 is provided above the base 1 and on the side of the centrifuge 2 away from the drive mechanism. The screw feeding mechanism 13 includes an auger conveyor 132 fixedly installed above the base 1 and a second drive device 131 for driving the auger conveyor 132 to rotate. The output end of the auger conveyor 132 passes through the centrifuge 2 and extends into the feeding channel of the cone 41.

[0030] like Figure 7 and Figure 8 As shown, a disperser 7 is fixedly installed on the inner wall of the cone 41 near the discharge end of the auger conveyor 132. The disperser 7 includes a fixed shaft 71 fixedly installed on the inner wall of the cone 41 and multiple distribution discs 72 sleeved on its outer side. The multiple distribution discs 72 are equidistantly spaced along the axial direction of the fixed shaft 71. The diameter of the distribution discs 72 increases sequentially along the discharge direction of the auger conveyor 132, and multiple fins 73 are evenly distributed circumferentially on the outer edge of each distribution disc 72. The cone 41, the auger blades 42 and the disperser 7 are fixedly connected and rotate synchronously. The disperser 7 rotates with the cone 41, which can break up the material pushed to the discharge end by the auger conveyor 132, prevent the caking material from directly entering the guide gap 5, and enable the material to form a relatively uniform material layer on the inner side of the filter cloth 6 to ensure the effect of solid-liquid separation.

[0031] like Figure 5 and Figure 6 As shown, multiple material distribution ports 43 are provided axially on the wall of the cone 41. The material distribution ports 43 connect the inside of the cone 41 with the material guiding gap 5, and are used to guide the material from the inside of the cone 41 to the material guiding gap 5. Multiple stop plates 44 are provided axially on the outer wall of the cone 41 and between two adjacent spiral blades 42. The stop plates 44 are fixed to the corresponding spiral blades 42. The material distribution ports 43 are distributed axially along the cone 41, which can make the material enter the material guiding gap 5 evenly. The stop plates 44 can block one side of the material distribution port 43, which can prevent the material from flowing back into the cone 41 through the material distribution port 43 under the action of centrifugal force or pressure difference, so as to ensure the unidirectional flow of the material.

[0032] Furthermore, multiple spiral blades 42 form multiple spiral channels on the outer wall of the cone 41. A crushing plate 45 is fixedly installed in the spiral channel at the discharge end of the outer wall of the cone 41. The crushing plate 45 protrudes outward along the radial direction of the cone 41. The crushing plate 45 is located at the discharge end of the guide gap 5 and in the channel between adjacent spiral blades 42. It rotates synchronously with the cone 41. When the caking filter cake formed after double extrusion and dewatering reaches the discharge end, the crushing plate 45 can apply a shearing action to the filter cake, breaking the caking filter cake into loose particles, which facilitates the subsequent material collection work.

[0033] Working principle of the invention: When processing materials, the first drive device 8 is started first, and the power is transmitted to the differential 10 through the gearbox 9. The differential 10 divides the single input power into two paths. The bushing 101 drives the outer drum 3 to rotate, and the spindle 102 drives the screw pusher 4 to rotate. At the same time, the second drive device 131 is started to drive the auger conveyor 132 to work, and continuously conveys the material to be separated from the feed end to the feeding channel of the cone 41. The material moves towards the discharge end under the continuous push of the subsequent material. When the material reaches the discharge end of the auger conveyor 132, it impacts the disperser 7 that rotates with the cone 41. At this time, the fins 73 on the outer edge of the high-speed rotating distribution plate 72 crush the material, breaking the clumps formed by the compression of the material during the conveying process into a loose state. The crushed material enters the annular guide gap 5 through the distribution port 43 under the action of centrifugal force. Under the action of centrifugal force, the solid phase material is thrown onto the surface of the filter cloth 6 and intercepted to form a filter cake layer, while the liquid phase passes through the filter cloth 6 and flows out of the centrifuge box 2 through the liquid outlet 201. The solid material on the surface of the filter cloth 6 is pushed from the feed end to the discharge end by the spiral blades 42. As the radial width of the guide gap 5 decreases continuously from the feed end to the discharge end, the material channel gradually narrows and the filter cake is subjected to radial extrusion force. At the same time, the pitch of the adjacent spiral blades 42 decreases continuously from the feed end to the discharge end, and the volume between the adjacent blades gradually shrinks. The filter cake is subjected to gradually increasing compressive force in the axial direction. Under the combination of centrifugal force, radial extrusion and axial extrusion, the moisture content of the filter cake continues to decrease during the process of pushing towards the discharge end, and finally a dense and compacted filter cake is formed. When the filter cake reaches the discharge end of the feed gap 5, the crushing plate 45 is provided in the channel between the adjacent spiral blades 42. It can apply a shearing action to the filter cake by rotating synchronously with the cone 41, breaking the caking filter cake into loose particles. Then it is discharged from the discharge port 202 of the centrifuge box 2, completing the solid phase separation. When the single batch separation is completed or the filter cloth 6 is blocked, the cleaning liquid is sprayed onto the surface of the filter cloth 6 through the backflushing pipe 203. The spray holes at the bottom of the backflushing pipe 203 are evenly distributed and face the filter cloth 6, which washes away the fine particles and attachments remaining in the pores of the filter cloth 6 and restores the water permeability of the filter cloth 6.

[0034] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic differential direct-drive horizontal screw discharge centrifuge, comprising a base (1), a centrifuge chamber (2) fixedly connected to the top of the base (1), an outer drum (3) rotatably connected inside the centrifuge chamber (2), a filter cloth (6) provided on the inner wall of the outer drum (3), and a screw pusher (4) rotatably provided inside the outer drum (3), a drive mechanism for driving the outer drum (3) and the screw pusher (4) to rotate provided on the top of the base (1), and a screw feeding mechanism (13) provided above the base (1) and on the side of the centrifuge chamber (2) away from the drive mechanism, characterized in that, An annular guide gap (5) is formed between the outer drum (3) and the screw pusher (4). The radial width of the annular guide gap (5) decreases continuously from the feed end to the discharge end. The screw pusher (4) includes a cone (41) and multiple screw blades (42) fixedly disposed on its outer wall. The pitch of the multiple screw blades (42) decreases continuously from the feed end to the discharge end. The spiral blade (42) is provided with a wave-shaped surface that extends continuously along the spiral direction. The wave-shaped surface is composed of continuously alternating troughs (421) and crests (422).

2. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, The drive mechanism includes a transmission box (11) fixed on the top of the base (1). A differential (10) is provided on one side of the transmission box (11). The differential (10) has an external output end and an internal output end arranged coaxially. A bushing (101) is fixedly connected to the external output end. A spindle (102) is fixedly connected to the internal output end. The spindle (102) is rotatably inserted inside the bushing (101). The bushing (101) rotatably passes through the transmission box (11) and the centrifuge box (2). The bushing (101) is fixedly connected to the outer drum (3). The spindle (102) passes through the outer drum (3) and is fixedly connected to the screw feeder (4).

3. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 2, characterized in that, The drive mechanism also includes a first drive unit (8) and a gearbox (9) mounted on the top of the base (1). The output shaft of the first drive unit (8) is fixedly connected to the input shaft of the gearbox (9). The output shaft of the gearbox (9) is connected to the input end of the differential (10). The differential (10) is used to transmit power to the bushing (101) and the spindle (102) respectively.

4. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, A lubrication mechanism is provided above the base (1) and on one side of the transmission box (11). The lubrication mechanism includes an oil tank (12) fixed on the top of the base (1). A circulation pump (121) is provided on the top of the oil tank (12). The oil outlet of the circulation pump (121) is connected to the lubrication oil circuit of the differential (10) for circulating supply of lubricating oil to the differential (10).

5. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, The spiral feeding mechanism (13) includes an auger conveyor (132) fixedly mounted above the base (1) and a second driving device (131) for driving the auger conveyor (132) to rotate. The output end of the auger conveyor (132) passes through the centrifuge (2) and extends into the feeding channel of the cone (41).

6. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 5, characterized in that, A disperser (7) is fixedly installed on the inner wall of the cone (41) near the discharge end of the auger conveyor (132). The disperser (7) includes a fixed shaft (71) fixedly installed on the inner wall of the cone (41) and multiple distribution discs (72) sleeved on its outer side. The multiple distribution discs (72) are equidistantly spaced along the axial direction of the fixed shaft (71). The diameter of the distribution discs (72) increases sequentially along the discharge direction of the auger conveyor (132), and multiple fins (73) are evenly distributed circumferentially on the outer edge of each distribution disc (72).

7. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, The cone (41) has multiple material distribution ports (43) axially opened on its wall. The material distribution ports (43) connect the inside of the cone (41) with the material guide gap (5) and are used to guide the material from the inside of the cone (41) to the material guide gap (5). Multiple stop plates (44) are axially spaced on the outer wall of the cone (41) and located between two adjacent spiral blades (42). The stop plates (44) are fixed to the corresponding spiral blades (42).

8. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, Multiple spiral blades (42) form multiple spiral channels on the outer wall of the cone (41). A crushing plate (45) is fixedly installed in the spiral channel at the discharge end of the outer wall of the cone (41). The crushing plate (45) protrudes outward along the radial direction of the cone (41) and is used to crush the caking filter cake formed after dewatering.

9. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, The centrifuge (2) has a liquid outlet (201) at the bottom or side wall. The liquid outlet (201) is connected to the inside of the centrifuge (2) and is used to discharge the separated liquid phase. The centrifuge (2) has a discharge port (202) on the side away from the drive mechanism. The discharge port (202) is connected to the discharge end of the guide gap (5) and is used to discharge the separated solid phase.

10. The hydraulic differential direct-drive horizontal screw discharge centrifuge according to claim 1, characterized in that, A backflush pipe (203) is fixedly connected to the top of the inner wall of the centrifuge (2). The backflush pipe (203) extends along the axial direction of the outer drum (3). One end of the backflush pipe (203) is used to connect to an external cleaning liquid source. Multiple spray holes are spaced apart along the axial direction at the bottom of the backflush pipe (203), and the spray holes are set towards the filter cloth (6) to spray cleaning liquid onto the filter cloth (6) to remove the adhering substances on its surface.

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