A spiral pressing filter device and its control system and conveying device

Abstract

The present invention discloses a spiral pressing filter device and its control system and conveying device, belonging to the technical field of chemical equipment. A spiral pressing filter device of the present invention comprises a bracket, a shell, a feeding device, a discharging device, a conveying device and a filter screen, the shell is fixedly connected to the bracket and forms the outer contour of the spiral pressing filter device with the bracket, the feeding device and the discharging device are arranged on the shell, the filter screen is sleeved on the outside of the conveying device and the filter screen and the conveying device are coaxially arranged so that the filter screen and the conveying device form a filtering space, and the shell is sleeved on the outside of the filter screen; a power device is provided on one side of the conveying device, and the power device is fixedly connected to the main shaft so that when the main shaft rotates forward, the material is transported from the side of the filter screen close to the feeding device to the side of the filter screen away from the feeding device, and when the main shaft is reversed, the material is transported from the side of the filter screen away from the feeding device to the side of the filter screen close to the feeding device so that the material is more fully dehydrated during the forward and reverse rotation process.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, and more specifically to a spiral pressing and filtering device and a control system and a conveying device thereof. Background Art

[0002] Semiconductor materials are used to manufacture semiconductor devices. Semiconductor materials are made from semiconductor precursor materials. Semiconductor precursor materials refer to a class of chemical substances used to prepare semiconductor materials. Before semiconductors can be manufactured, they often have to undergo multiple processing steps, including dehydration of the semiconductor precursor materials.

[0003] Dehydration equipment in the prior art often needs to repeatedly dehydrate the same batch of materials when dehydrating semiconductor precursors. It is difficult to perform relatively sufficient solid-liquid separation of the materials during one transportation process to meet the user's requirements for solid-liquid separation efficiency. Summary of the invention

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] Some embodiments of the present application propose a spiral pressing filter device and its control system and conveying device to solve the technical problems mentioned in the above background technology section.

[0006] As a first aspect of the present application, some embodiments of the present application provide a spiral pressing filter device, including a bracket, a shell, a feeding device, a discharging device, a conveying device and a filter screen, wherein the shell is fixedly connected to the bracket and forms the outer contour of the spiral pressing filter device with the bracket, the feeding device and the discharging device are arranged on the shell, the filter screen is sleeved on the outside of the conveying device and the filter screen is coaxially arranged with the conveying device so that the filter screen and the conveying device form a filtering space, and the shell is sleeved on the outside of the filter screen; wherein the conveying device includes a main shaft and a conveying blades; the height of one end of the conveying device close to the feeding device is lower than the height of the other end of the conveying device away from the feeding device, and the angle between the straight line where the axis of the main shaft is located and the horizontal line ranges from 3° to 7°; a power device is provided on one side of the conveying device, and the power device is fixedly connected to the main shaft so that when the main shaft rotates forward, the material is conveyed from the side of the filter screen close to the feeding device to the side of the filter screen away from the feeding device, and when the main shaft is reversed, the material is conveyed from the side of the filter screen away from the feeding device to the side of the filter screen close to the feeding device.

[0007] Furthermore, the filter screen includes a first section filter screen and a second section filter screen, the cross-sectional diameter of the first section filter screen is equal from point A to point B, and the cross-sectional diameter of the second section filter screen gradually increases from point B to point C, wherein point A and point C are marking points of the two endpoints of the filter screen, and point B is the marking point of the endpoint of the first section filter screen.

[0008] Furthermore, the ratio of the length of the line connecting point A and point B to the length of the line connecting the projection points of point A and point C on the line connecting point A and point B ranges from 3 / 5 to 2 / 3.

[0009] Furthermore, the angle between the straight line connecting point A and point C and the axis of the main shaft ranges from 2° to 4°.

[0010] Furthermore, the conveying device includes a main shaft and conveying blades, the conveying blades are fixedly connected to the main shaft, and the pitch of the conveying blades at the projections of points A and B on the main shaft is smaller than the pitch of the conveying blades at the projections of points B and C on the main shaft.

[0011] Furthermore, the diameter of the cross section of the filter screen at one end close to the feeding device gradually increases to the diameter of the cross section of the filter screen at one end away from the feeding device.

[0012] Furthermore, points D and E are marked at both ends of a straight line where a plane passing through the filter axis intersects the filter surface, and the angle between the line connecting points D and E and the axis ranges from 1° to 2°.

[0013] Furthermore, the conveying device includes a main shaft and conveying blades, the conveying blades are fixedly connected to the main shaft, and the pitch of the conveying blades gradually increases from one end close to the feeding device to the end of the filter screen away from the feeding device.

[0014] Furthermore, the feeding device includes a feeding hopper, a feeding pipe and a feeding valve. One end of the feeding pipe is connected to the feeding hopper, and the other end passes through the outer shell and is connected to the filtering space inside the filter. The feeding pipe is provided with a feeding valve.

[0015] Furthermore, the discharging device includes a solid discharging part and a liquid discharging part, the solid discharging part includes a discharging pipe and a discharging valve, the discharging pipe passes through the outer shell and is connected to the filtering space inside the filter screen, and the discharging pipe is provided with a discharging valve; one end of the liquid discharging part is connected to the inside of the outer shell.

[0016] Furthermore, the liquid discharge member includes a first discharge portion and a second discharge portion, and the first discharge portion and the second discharge portion are arranged adjacent to each other.

[0017] As a second aspect of the present application, some embodiments of the present application provide a conveying device for the above-mentioned spiral pressing and filtering device.

[0018] As the third aspect of the present application, some embodiments of the present application provide a control system for a spiral pressing filter device, the control system for the spiral pressing filter device comprising: a weighing module, for obtaining the weight of the discharge of the discharge module per unit time according to an input control signal; a speed control solenoid valve, for increasing or decreasing the speed of the power device according to an input control signal; a control device, wherein a user sends a control signal to the speed control solenoid valve according to the electrical signal sent by the weighing module to control the speed of the power device; wherein the weighing module comprises: a solid discharge part weighing module, for obtaining the discharge weight of the solid per unit time and sending an electrical signal of the discharge weight of the solid per unit time to the control device; a liquid discharge part weighing module, wherein a user obtains the discharge weight of the liquid per unit time and sends an electrical signal of the discharge weight of the liquid per unit time to the control device.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] A power device is provided on one side of the conveying device, and the power device is fixedly connected to the main shaft so that when the main shaft rotates forward, the material is conveyed from the side of the filter screen close to the feeding device to the side of the filter screen away from the feeding device, and when the main shaft is reversed, the material is conveyed from the side of the filter screen away from the feeding device to the side of the filter screen close to the feeding device, so that the raw material slowly rises during transportation. When the raw material reaches the top of the conveying device, the power device continues to rotate the main shaft so that the raw material is squeezed at the farthest end of the conveying device away from the feeding device, and the water in the raw material is separated from the fixed. After squeezing for a certain period of time, the squeezing process is completed, and the power device reverses the main shaft to convey the squeezed raw material from the farthest end of the conveying device away from the feeding device to the discharging device. In the process of reverse conveying, the raw material is stirred and then again screw-filtered, and its water is further separated, so that the water content of the raw material is further reduced when it reaches the discharging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0022] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0023] Figure 1 is a schematic diagram of the overall structure of a spiral pressing filter device according to an embodiment of the present application;

[0024] Figure 2 This is a three-dimensional diagram of the overall structure of a spiral pressing filter device according to an embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of a filter screen of a spiral pressing filter device according to an embodiment of the present application;

[0026] Figure 4 The spiral pressing filter device according to one embodiment of the present application is different from Figure 3 Schematic diagram of the filter structure.

[0027] Explanation of the symbols in the schematic diagram:

[0028] 100. Bracket;

[0029] 200, housing;

[0030] 300, feeding device; 310, feeding hopper; 320, feeding pipeline; 330, feeding valve;

[0031] 400, discharging device; 410, solid discharging part; 411, discharging pipe; 412, discharging valve; 420, liquid discharging part; 421, first discharging part; 422, second discharging part;

[0032] 500, conveying device; 510, main shaft; 520, conveying blade;

[0033] 600, filter; 610, first stage filter; 620, second stage filter;

[0034] 700. Power unit. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0036] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0037] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0038] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0039] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0040] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0041] like Figures 1 to 4 As shown, a spiral pressing filter device according to an embodiment of the present application comprises a support 100, a housing 200, a feeding device 300, a discharging device 400, a conveying device 500 and a filter screen 600, wherein the housing 200 is fixedly connected to the support 100 and forms an outer contour of the spiral pressing filter device with the support 100, the feeding device 300 and the discharging device 400 are arranged on the housing 200, the filter screen 600 is sleeved on the outside of the conveying device 500 and the filter screen 600 is connected to the conveying device 500. 00 is coaxially arranged so that the filter screen 600 and the conveying device 500 constitute a filtering space, and the outer shell 200 is sleeved on the outside of the filter screen 600; wherein the conveying device 500 includes a main shaft 510 and a conveying blade 520 arranged on the main shaft 510; the height of one end of the conveying device 500 close to the feeding device 300 is lower than the height of one end of the conveying device 500 away from the feeding device 300, and the angle between the straight line where the axis of the main shaft 510 is located and the horizontal line ranges from 3° to 7°.

[0042] Specifically, the housing 200 is fixedly connected to the bracket 100, and the bracket 100 supports the entire spiral squeeze filter device. The conveying device 500 is installed on the bracket 100 through a bearing, and the conveying device 500 is rotatably connected to the bracket 100. The two ends of the housing 200 are fixedly connected to the bracket 100, and the housing 200 and the bracket 100 together form a closed environment for squeeze filtration. The housing 200 is also provided with a feeding device 300 and a discharging device 400. Specifically, the feeding device 300 is arranged at the upper end of the housing 200, and the discharging device 400 is arranged at the lower end of the housing 200. The upper end and the lower end referred to here are the two ends along the gravity direction on the housing 200. The discharging device 400 is arranged on the opposite side of the feeding device 300 on the housing 200, and the axes of the discharging device 400 and the feeding device 300 are parallel to the feeding and discharging directions, which is conducive to feeding and discharging.

[0043] The spiral pressing and filtering device also includes a conveying device 500 and a filter screen 600. The conveying device 500 is rotatably connected to the bracket 100 through a bearing. The outer side of the conveying device 500 is sleeved with a filter screen 600. Both ends of the filter screen 600 are also fixedly connected to the bracket 100 and the conveying device 500 to form a filtering space for the raw materials, that is, the filter screen 600 is arranged between the shell 200 and the conveying device 500. The overall shape of the filter screen 600 is cylindrical. Specifically, the filter screen 600 is a cylinder made of thin iron plate with closed sides and filter holes on the side wall. A plurality of filter holes are equidistantly arranged on its side wall. The filter holes can allow water to pass through but can block the passage of solid particles. Therefore, the spiral pressing and filtering device stirs and conveys the raw materials during the conveying process through the conveying device 500. During the stirring and conveying process, the liquid in the raw material is filtered out from the filter screen 600, and the solid particles remain in the filter screen 600 and are finally transported out by the discharging device 400.

[0044] The conveying device 500 includes a main shaft 510 and conveying blades 520 arranged on the main shaft 510. In a specific embodiment, the conveying blades 520 are fixed to the outer surface of the main shaft 510, and the conveying blades 520 are arranged in a spiral manner on the main shaft 510. When the main shaft 510 rotates, the raw material is pushed by the conveying blades 520 to move in a fixed direction. At the same time, the raw material is also stirred by the conveying blades 520 during the movement, thereby allowing the water and solids in the raw material to be quickly separated into solid and liquid.

[0045] In a specific embodiment, the height of one end of the conveying device 500 close to the feeding device 300 is lower than the height of one end of the conveying device 500 away from the feeding device 300, the angle between the straight line where the axis of the main shaft 510 is located and the horizontal line is in the range of 3° to 7°, and the filter screen 600 is always coaxially arranged with the conveying device 500. A power device 700 is provided on one side of the conveying device 500, and the power device 700 is fixedly connected to the main shaft 510 so that when the main shaft 510 rotates forward, the material is transported from the side of the filter screen 600 close to the feeding device 300 to the side of the filter screen 600 away from the feeding device 300, and when the main shaft 510 rotates reversely, the material is transported from the side of the filter screen 600 away from the feeding device 300 to the side of the filter screen 600 close to the feeding device 300. That is, the raw material enters one end of the conveying device 500 from the feeding device 300, and the raw material is conveyed from this end. The raw material is transported in an oblique upward direction from one end of the feeding device 300, and the angle between the axis of the main shaft 510 and the horizontal line can be 3°, 4°, 5°, 6° or 7°. The raw material rises slowly during the transportation process. When the raw material reaches the top of the conveying device 500, the power device 700 continues to rotate the main shaft 510 so that the raw material is squeezed at the farthest end of the conveying device 500 away from the feeding device 300, and the water in the raw material is separated from the solid material. After squeezing for a certain time, the squeezing process is completed. At this time, the power device 700 reverses the main shaft 510 to transport the squeezed raw material from the farthest end of the conveying device 500 away from the feeding device 300 to the discharging device 400. During the reverse conveying process, the raw material is stirred and spirally conveyed and filtered again, and its moisture is further separated, so that the water content of the raw material is further reduced when it reaches the discharging device 400. The above-mentioned power device 700 is a servo motor that can perform forward and reverse rotation.

[0046] Since the resistance of the raw material with less water content when being transported by the conveying device 500 is greater than that of the raw material with greater water content, the resistance of the raw material being transported from the farthest end of the conveying device 500 away from the feeding device 300 to the discharging device 400 is greater than the process of the raw material being transported from the conveying device 500 closest to the feeding device 300 to the farthest end. Therefore, when performing reverse conveying, the strength requirement for the conveying blade 520 is greater than that for forward conveying. Over time, the service life of the conveying blade 520 is difficult to guarantee. In the present application, the height of the end of the conveying device 500 close to the feeding device 300 is lower than the height of the end of the conveying device 500 away from the feeding device 300. A certain height setting just balances the pressure difference of the conveying blade 520 during forward and reverse rotation, so that the blade maintains a consistent pressure regardless of whether it is during forward or reverse conveying, effectively improving the service life of the conveying device 500.

[0047] like Figure 3As shown, in a specific embodiment, the filter screen 600 includes a first section filter screen 610 and a second section filter screen 620, the cross-sectional diameter of the first section filter screen 610 is equal from point A to point B, and the cross-sectional diameter of the second section filter screen 620 gradually increases from point B to point C, wherein point A and point C are marking points of two end points on the filter screen 600, and point B is the marking point of the end point of the first section filter screen 610. The ratio of the length of the line connecting point A and point B to the length of the line connecting the projection points of point A and point C on the line connecting point A and point B is in the range of 3 / 5 to 2 / 3. The angle between the straight line connecting point A and point C and the axis of the main shaft 510 is in the range of 2° to 4°.

[0048] Specifically, for semiconductor precursor raw materials with a water content greater than 55%, the filter 600 adopts a two-stage type. For easy distinction, three points A, B, and C are marked on the filter 600, where point A and point C are the two end points of the filter 600, and point B is the dividing point between the first-stage filter 610 and the second-stage filter 620. The diameter of the first-stage filter 610 is always the same. When the raw material is transported from point A to point B, the raw material begins to dehydrate. When it reaches point B, the water content in the raw material reaches about 55%, that is, the water content of the raw material entering the BC-stage filter 600 (the second-stage filter 620) is up to 55%. The second filter screen 620 continues to dehydrate until it reaches point C of the second filter screen 620, and then the raw material begins to be squeezed. The squeezing process causes the raw material to be dehydrated in large quantities. Observe the weighing module at the discharge device 400. When it reaches the set threshold, operate the power device 700 to actively rotate in the opposite direction to transport the raw material to the discharge device 400. Since the diameter of the filter screen 600 in the BC section gradually increases and the diameter of the filter screen 600 from point C to point B gradually decreases, the raw material is further squeezed by the inner wall of the filter screen 600 during the process of reaching point B from point C, so that the raw material is dehydrated more thoroughly.

[0049] In a specific embodiment, the conveying device 500 includes a main shaft 510 and a conveying blade 520, and the conveying blade 520 is fixedly connected to the main shaft 510, and the pitch of the conveying blade 520 at the projection of point A and point B on the main shaft 510 is smaller than the pitch of the conveying blade 520 at the projection of point B and point C on the main shaft 510.

[0050] The pitch is proportional to the conveying volume, that is, the larger the pitch within a certain range, the greater the conveying volume. The pitch of the conveying blade 520 at the line segment connecting points A and B is smaller than the pitch of the line segment connecting points B and C. Therefore, the conveying volume of the conveying blade 520 at the line segment connecting points A and B is smaller than the conveying volume of the line segment connecting points B and C. At the same time, since the diameter of the filter screen 600 in the BC segment gradually increases and the diameter of the filter screen 600 from point C to point B gradually decreases, therefore, in the process of reverse conveying, the material will be squeezed again when passing through point B, and the water inside it will further fall off from the raw material, making the raw material dehydrated more thoroughly.

[0051] like Figure 4 As shown, in a specific embodiment, the diameter of the cross section of the filter screen 600 at one end close to the feeding device 300 gradually increases to the diameter of the cross section of the filter screen 600 at one end away from the feeding device 300. Points D and E are marked at both ends of a straight line intersecting a plane passing through the axis of the filter screen 600 and the surface of the filter screen 600, and the angle between the line connecting the points D and E and the axis ranges from 1° to 2°.

[0052] Specifically, for semiconductor precursor materials with a water content of less than 50%, the overall diameter of the filter 600 gradually increases from the nearest end to the farthest end of the feeding device 300. During the reversal of the main shaft 510, the raw material is transported from point E to point D. The raw material is squeezed by the conveying blades 520 and the inner wall of the filter 600, so that the raw material is dehydrated more thoroughly.

[0053] In a specific embodiment, the conveying device 500 includes a main shaft 510 and a conveying blade 520, and the conveying blade 520 is fixedly connected to the main shaft 510, and the pitch of the conveying blade 520 gradually increases from one end close to the feeding device 300 to the end of the filter 600 away from the feeding device 300.

[0054] The pitch is proportional to the conveying volume, that is, the larger the pitch within a certain range, the greater the conveying volume. The pitch of the conveying blade 520 on the main shaft 510 gradually increases from the feed port to the farthest end, so its conveying volume is gradually increased. The amplitude of the pitch increase is controlled so that during the forward conveying (from the feed port to the farthest end) of the main shaft 510, the increase in the conveying volume is sufficient to fill the increase in the conveying volume brought about by the increase in the diameter of the filter screen 600. During the reverse conveying of the main shaft 510, the diameter of the filter screen 600 gradually decreases, and the pitch is also gradually reduced, so that the material can be squeezed by the inner wall of the filter screen 600 during the reverse conveying process, so that the material can be dehydrated more thoroughly.

[0055] In a specific embodiment, the feeding device 300 includes a feeding hopper 310, a feeding pipe 320 and a feeding valve 330. One end of the feeding pipe 320 is connected to the feeding hopper 310, and the other end passes through the housing 200 to be connected to the filtering space inside the filter screen 600. The feeding valve 330 is provided in the feeding pipe 320. The discharging device 400 includes a solid discharging member 410 and a liquid discharging member 420. The solid discharging member 410 includes a discharging pipe 411 and a discharging valve 412. The discharging pipe 411 passes through the housing 200 to be connected to the filtering space inside the filter screen 600. The discharging pipe 411 is provided with a discharging valve 412. One end of the liquid discharging member 420 is in communication with the inside of the housing 200.

[0056] Specifically, the feed hopper 310 is a trumpet-shaped cylinder with an opening at one end, and a feed pipe 320 is connected to one end of the feed hopper 310. The other end of the feed pipe 320 passes through the housing 200 and the filter screen 600 and is directly connected to the filtering space inside the filter screen 600, that is, the raw material can directly enter the filtering space from the feed hopper 310 for squeezing and filtering. A feed valve 330 is provided in the feed pipe 320. When the feed valve 330 is opened, the material can be fed, and when the feed valve 330 is closed, the material cannot be fed. The solid discharge member 410 in the discharge device 400 is arranged on the opposite side of the feed device 300, and the solid discharge member 410 is also provided with a discharge valve 412. When the feed valve 330 and the discharge valve 412 are closed at the same time, a relatively closed filtering space is formed inside the filter screen 600. One end of the liquid discharge member 420 is provided with a large opening that is connected to the inside of the housing 200, and can collect all the liquid filtered out of the filter screen 600. In a specific embodiment, the liquid discharge member 420 includes a first discharge portion 421 and a second discharge portion 422, and the first discharge portion 421 and the second discharge portion 422 are arranged adjacent to each other. The adjacent design of arranging two discharge portions can better observe the liquid discharge conditions at different positions of the filter screen 600, and adjust the power of the power device 700 according to the liquid discharge conditions.

[0057] In a specific embodiment, this embodiment discloses a control system for a spiral pressing filter device, which includes: a weighing module, which is used to obtain the weight of the material discharged by the discharging module per unit time according to the input control signal; a speed control solenoid valve, which is used to increase or decrease the speed of the power device 700 according to the input control signal; a control device, in which the user sends a control signal to the speed control solenoid valve according to the electrical signal sent by the weighing module to control the speed of the power device 700; wherein the weighing module includes: a solid discharging component 410 weighing module, which is used to obtain the weight of the solid material discharged per unit time and send an electrical signal of the solid material discharged per unit time to the control device; a liquid discharging component 420 weighing module, in which the user obtains the weight of the liquid material discharged per unit time and sends an electrical signal of the liquid material discharged per unit time to the control device. The above-mentioned control device can be a PLC or an MCU or an FPGA or a CPU, and the accuracy of the pressing is ensured and the filtering efficiency is improved by accurately controlling the speed of the power device 700.

[0058] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A spiral pressing filter device, characterized in that: It comprises a support, a shell, a feeding device, a discharging device, a conveying device and a filter screen, wherein the shell is fixedly connected to the support and forms the outer contour of the spiral pressing filter device with the support, the feeding device and the discharging device are arranged on the shell, the filter screen is sleeved on the outside of the conveying device and the filter screen and the conveying device are coaxially arranged so that the filter screen and the conveying device form a filtering space, and the shell is sleeved on the outside of the filter screen; Wherein, the conveying device comprises a main shaft and a conveying blade arranged on the main shaft; The height of one end of the conveying device close to the feeding device is lower than the height of one end of the conveying device away from the feeding device, and the angle between the straight line where the axis of the main shaft is located and the horizontal line is in the range of 3° to 7°; A power device is provided on one side of the conveying device, and the power device is fixedly connected to the main shaft so that when the main shaft rotates forward, the material is conveyed from the side of the filter screen close to the feeding device to the side of the filter screen away from the feeding device, and when the main shaft rotates reversely, the material is conveyed from the side of the filter screen away from the feeding device to the side of the filter screen close to the feeding device; The filter screen comprises a first filter screen and a second filter screen, wherein the cross-sectional diameter of the first filter screen is equal from point A to point B, and the cross-sectional diameter of the second filter screen gradually increases from point B to point C, wherein point A and point C are marking points of two end points on the filter screen, and point B is the marking point of the end point of the first filter screen; The ratio of the length of the line connecting point A and point B to the length of the line connecting the projection points of point A and point C on the line connecting point A and point B ranges from 3 / 5 to 2 / 3.

2. The spiral pressing filter device according to claim 1, characterized in that: The angle between the straight line connecting point A and point C and the axis of the main shaft ranges from 2° to 4°.

3. The spiral pressing filter device according to claim 2, characterized in that: The conveying device includes a main shaft and a conveying blade, wherein the conveying blade is fixedly connected to the main shaft, and the pitch of the conveying blade at the projection of point A and point B on the main shaft is smaller than the pitch of the conveying blade at the projection of point B and point C on the main shaft.

4. The spiral pressing filter device according to claim 1, characterized in that: The diameter of the cross section of the filter screen at one end close to the feeding device gradually increases to the diameter of the cross section of the filter screen at one end away from the feeding device.

5. The spiral pressing filter device according to claim 4, characterized in that: Points D and E are marked at both ends of a straight line where a plane passing through the filter axis intersects the filter surface, and the angle between the line connecting points D and E and the axis ranges from 1° to 2°.

6. The spiral pressing filter device according to claim 5, characterized in that: The conveying device comprises a main shaft and conveying blades, wherein the conveying blades are fixedly connected to the main shaft, and the pitch of the conveying blades gradually increases from one end close to the feeding device to the end of the filter screen away from the feeding device.

7. The spiral pressing filter device according to claim 1, characterized in that: The feeding device comprises a feeding hopper, a feeding pipe and a feeding valve. One end of the feeding pipe is connected to the feeding hopper, and the other end passes through the outer shell and is connected to the filtering space inside the filter screen. The feeding pipe is provided with a feeding valve.

8. The spiral pressing filter device according to claim 1 or 7, characterized in that: The discharging device comprises a solid discharging part and a liquid discharging part, the solid discharging part comprises a discharging pipe and a discharging valve, the discharging pipe passes through the outer shell and is connected to the filtering space inside the filter screen, and the discharging pipe is provided with a discharging valve; One end of the liquid discharge piece is communicated with the interior of the shell.

9. The spiral pressing filter device according to claim 8, characterized in that: The liquid discharge member comprises a first discharge portion and a second discharge portion, and the first discharge portion and the second discharge portion are arranged adjacent to each other.

10. A conveying device, characterized in that: Used in a screw press filter device as described in any one of claims 1 to 9.

11. A control system for a spiral pressing filter device, characterized in that: The spiral pressing filter device is the spiral pressing filter device according to any one of claims 1 to 9, and the control system of the spiral pressing filter device comprises: The weighing module is used to obtain the weight of the material discharged by the discharging module per unit time according to the input control signal; A speed control solenoid valve, used to increase or decrease the speed of the power device according to an input control signal; A control device, wherein the user sends a control signal to the speed control solenoid valve according to the electrical signal sent by the weighing module to control the speed of the power device; Wherein, the weighing module comprises: A solid discharge weighing module, used for obtaining the discharge weight of the solid in a unit time and sending an electrical signal of the discharge weight of the solid in the unit time to the control device; The liquid discharge weighing module is used for the user to obtain the discharge weight of the liquid per unit time and to send an electrical signal of the discharge weight of the liquid per unit time to the control device.

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