Centrifugal separator with preventive function of attachment and accumulation of trash

Abstract

The present invention relates to a centrifugal separator in which a cylindrical cylinder body is inserted and installed inside a house-type device casing, a screw pipe equipped with a conveying screw is inserted and installed inside the cylinder body, cylinder shafts are connected and installed at both ends of the cylinder body to provide a drive shaft by a driving motor and an input shaft of a planetary gear reducer, respectively, pipe support shafts are connected and installed at both ends of the screw pipe with bearings interposed along the cylinder shafts at corresponding positions, an input pipe for sludge-type debris is inserted and installed through the one cylinder shaft and the pipe support shaft in the axial direction to the inside of the screw pipe, and the other pipe support shaft is connected and installed to a screw reduction shaft that serves as the output shaft of a planetary gear reducer, thereby separating sludge discharged from the input pipe through the screw pipe to the conveying screw side into debris and filtrate, wherein a crush frame in the shape of a " " is installed on the outer surface of the end side of the cylinder body provided with a discharge port for debris, thereby allowing the cylinder body to... of the device casing... The present invention relates to a centrifuge provided with a function to prevent the attachment and accumulation of contaminants, wherein contaminant components scattered and attached to the inner surface are not accumulated beyond a certain level and are continuously crushed and removed by a crush frame, thereby preventing overload, malfunction, and failure of the centrifuge caused by contaminant components accumulated and adhered in large quantities inside the device casing.

Description

Technology Field

[0001] The present invention relates to a centrifugal separator installed in a comprehensive waste treatment system designed to separate and treat various impurities contained in manure or livestock wastewater from the liquid, and used to finally separate fine impurities, such as fine sand components, from the liquid. The invention relates to a centrifugal separator provided with a function to prevent the attachment and accumulation of impurities, wherein a crush frame arranged in the form of a blade plate or a propeller is installed on the outer surface of the end of a cylinder body from which impurities introduced in the form of sludge are discharged separated from the liquid, thereby enabling the continuous crushing and detachment of impurity components that are scattered and attached to the inside of a device casing covering the cylinder body. Background Technology

[0002] Recently, due to the increase in urban population and the trend of large-scale livestock farms, large amounts of sewage, domestic sewage, manure, and livestock wastewater are being generated. As a result of this sewage, domestic sewage, manure, and livestock wastewater, pollution of groundwater, rivers, and coastal areas is becoming increasingly serious, and the odors generated from sewage, domestic sewage, manure, and livestock wastewater are also having an adverse effect on creating a pleasant residential environment.

[0003] In particular, in the case of manure and livestock wastewater, separate purification facilities are established in each region to manage and treat them at the government level. However, since the concentration of suspended solids (SS) in livestock wastewater is at the level of 20,000 to 25,000 ppm, there was a problem of overloading the purification facilities when they were operated. Accordingly, in order to treat manure and livestock wastewater more efficiently, various impurities are removed from the collected manure and livestock wastewater to form a liquid filtrate with a low concentration of suspended solids, and then this is sent to a final purification facility for treatment.

[0004] As described above, a comprehensive impurity treatment device is known to have been previously filed as Patent Application No. 34855 in 2008 and registered as Patent No. 10-0880270 by the present applicant, which is intended to separate manure or livestock wastewater into filtrate and impurities. This device involves a primary impurity treatment process using a rotary screen and a screw dehydrator for manure or livestock wastewater introduced into the device housing, the filtrate generated during this process is stored in a filtrate storage tank, and the filtrate is pumped by a cyclone and divided into a seed removal screen and a centrifugal separator to remove even fine impurities such as seeds, animal hair, and fine fibers contained in the filtrate, and then the filtrate is supplied to a final purification facility through a filtrate discharge tank.

[0005] In the comprehensive impurity treatment device previously filed by the applicant, the cyclone performs the function of primarily separating fine impurities containing seeds, animal hair, and fine sand components based on the difference in specific gravity. Fine impurities with a light specific gravity, such as seeds or animal hair, are fed (overflow) to the seed removal screen side along with the liquid and dewatered, while fine impurities with a heavy specific gravity, such as fine sand components, settle to the inner bottom side of the cyclone and then form into a sludge state along with the liquid, which is then fed into the interior of a centrifuge and dewatered.

[0006] As described above, the sludge-shaped impurity components introduced into the interior of the centrifuge are separated into liquid and impurity by the cylinder body of the centrifuge and the screw pipe rotating relative to it, and then finally discharged through the impurity discharge port and the liquid discharge port provided at each end of the cylinder body. During this process, the impurity scattered from the cylinder body adheres to the inner surface of the device casing covering the cylinder body due to its own viscosity, and a situation occurs in which it hardens and adheres as a hard, dried lump over time.

[0007] As described above, as contaminants are continuously attached and adhered to the inner side of the device casing of the cylinder body forming the centrifuge, the volume of the clumps gradually increases and accumulates in large quantities up to the inlet side of the cylinder body. Consequently, the rotational operation of the cylinder body is subjected to significant interference (frictional resistance) due to the clumps of contaminants, and there was a problem in that the contaminant discharge port provided to the cylinder body itself was frequently blocked by the clumps of contaminants.

[0008] Due to the above-mentioned problems, the drive motor for the centrifuge was overloaded, and malfunctions and breakdowns of the centrifuge were induced, causing the operation of the comprehensive waste treatment system to be unnecessarily stopped. To prevent this, it was necessary to perform a very cumbersome and difficult task of separating the device casing covering the cylinder body of the centrifuge and individually removing the lumps of waste attached to the inside, which was undesirable in terms of treating manure or livestock wastewater more quickly, efficiently, and economically. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-0880270 Republic of Korea Registered Patent No. 10-1599972 The problem to be solved

[0010] The present invention has been devised to solve the aforementioned conventional problems, and in addition to the centrifugal separator of the previously filed comprehensive waste treatment device, a centrifugal separator for dewatering treatment used to separate sludge-shaped waste from the filtrate comprises: a vane plate or a propeller-type arrangement on the outer surface of the end side of the cylinder body where the discharge port of the waste separated from the filtrate is located. The main technical objective is to provide a centrifuge with a function to prevent the attachment and accumulation of contaminants, which prevents contaminant components scattered and attached from the cylinder body to the inner surface of the device casing from accumulating beyond a certain level by installing a crush frame, thereby ensuring that the contaminant components are continuously crushed and removed by the crush frame, and thereby prevent overload, malfunction, and breakdown of the centrifuge caused by contaminant components accumulated and fixed in large quantities inside the device casing. means of solving the problem

[0011] As a means to solve the above technical problem, the present invention comprises: a cylindrical cylinder body inserted and installed inside a house-type device casing supported by a device support; a planetary gear reducer installed on the rear outer side of the device casing; a screw pipe equipped with a conveying screw on its outer surface inserted and installed inside the cylinder body; a cylinder shaft that rotates by receiving power from a drive motor and a cylinder shaft providing an input shaft for the planetary gear reducer respectively connected and installed at both ends of the cylinder body; a pipe support shaft inserted into the cylinder shaft at the corresponding position with bearings interposed therein connected and installed at both ends of the screw pipe; an input pipe for sludge-type debris inserted and installed into the internal space of the screw pipe by penetrating the cylinder shaft and pipe support shaft at the corresponding position axially from the front side of the device casing; a screw reduction shaft connected to the pipe support shaft by penetrating the cylinder shaft at the corresponding position axially at the output part of the planetary gear reducer; and a pair of partitions by In a centrifugal separator in which an input space is provided, an outlet of an input pipe is disposed inside the input space, a discharge hole for sludge-type debris is formed on a screw pipe corresponding to the periphery of the input space, a debris discharge port and a filtrate discharge port are respectively formed on the front and rear sides of the cylinder body, and a debris discharge pipe and a filtrate discharge pipe are respectively installed on the lower surface of the front side and the lower surface of the rear side of the device support, wherein at least one crush frame is connected and installed on the outer circumference of the front side of the cylinder body where the debris discharge port is formed to crush and detach debris attached to the inner surface of the device casing, and the crush frame comprises a pair of main frames extending by a predetermined height from the front and rear sides of the line based on the periphery line of the front side of the cylinder body where the debris discharge port is formed, and a connecting frame connecting the upper sides of each main frame It is characterized by being installed as a frame structure in the shape of a 'Z', wherein the upper portion of each main frame forming the crush frame is an inclined frame that extends at a predetermined angle along the rotational direction of the cylinder body, and the lower portion of each main frame is welded integrally with the cylinder body while inserted to a predetermined depth along the inner side of the front end of the cylinder body. Effects of the invention

[0012] According to the present invention as described above, the effect of continuously crushing and removing contaminant components that are scattered and attached from the cylinder body forming the centrifuge to the inner surface of the device casing using a crush frame that rotates together with the cylinder body at the end of the cylinder body provided with a contaminant discharge port is provided. By doing so, the phenomenon of contaminant components accumulating and adhering in large quantities and forming large clumps inside the device casing of the centrifuge is fundamentally blocked, thereby providing the effect of preventing overload of the drive motor for the centrifuge and malfunction and breakdown of the centrifuge caused by the adhering clumps of contaminant.

[0013] In particular, by slanting the upper part of the crush frame at a certain angle along the rotational direction of the cylinder body, inserting the lower part into the interior of the cylinder body to a predetermined depth, and then welding it integrally with the cylinder body, the structural strength of the crush frame itself, its service life, and the crushing performance of solidified debris can be maximized. Through this, it provides very useful effects, such as the treatment of manure and livestock wastewater using the previously filed debris comprehensive treatment machine, as well as the ability to dewater various debris introduced in the form of sludge more quickly, efficiently, and economically. Brief explanation of the drawing

[0014] FIG. 1 is a plan view of a centrifuge provided with a function to prevent the attachment and accumulation of impurities according to the present invention. FIG. 2 is a schematic side cross-sectional view of FIG. 1. Fig. 3 is a rear view of Fig. 1. Fig. 4 is a cross-sectional view of the main part of Fig. 1. FIG. 5 is an enlarged view of a key part showing another embodiment of FIG. 4. Specific details for implementing the invention

[0015] Hereinafter, the present invention for achieving the above objectives will be described in detail with reference to the attached drawings.

[0016] First, as shown in FIGS. 1 and FIGS. 2, the overall configuration of the centrifuge according to the present invention is based on a house-type device casing (1) supported by a device support (2), a cylindrical cylinder body (11) inserted and installed inside the device casing (1), and a screw pipe (12) that rotates relative to the cylinder body (11) while inserted inside the cylinder body (11), and a conveying screw (13) that is in contact with the cylinder body (11) is installed on the outer surface of the screw pipe (12).

[0017] The above cylinder body (11) has a body portion on the front side (left side of FIG. 2) that is tapered inwardly and a body portion on the rear side (right side of FIG. 2) that is in the shape of a true cylinder, and a conveying screw (13) provided on the outer surface of the screw pipe (12) is also installed with a spiral dimension corresponding to the body shape of the cylinder body (11). Due to this structure, a debris discharge port (19) is provided on the front side of the cylinder body (11), while a liquid discharge port (18) is provided on the rear side.

[0018] In addition, for the actual operation of the centrifuge (10), a cylinder shaft (7) is connected and installed at the front end of the cylinder body (11) and extends outward through the front wall of the device casing (1), and a driven pulley (5) connected to a drive motor (not shown) via a drive belt is installed on the cylinder shaft (7), thereby enabling the cylinder body (11) to rotate axially by the power of the drive motor. Additionally, a cylinder shaft (7) is connected and installed at the rear end of the cylinder body (11) and extends outward through the rear wall of the device casing (1), and the cylinder shaft (7) serves as the input shaft of the planetary gear reducer (30).

[0019] In addition, a pipe support shaft (21) is connected and installed on the front and rear ends of the screw pipe (12), and each pipe support shaft (21) is inserted and installed along the inside of the cylinder shaft (7) at the corresponding position with a bearing (22) interposed therein. A sludge-type impurity input pipe (3) is inserted and installed through the front end cylinder shaft (7) and the pipe support shaft (21) in the axial direction to the inside of the screw pipe (12), and a screw reduction shaft (31) is connected and installed on the rear end pipe support shaft (21), extending through the cylinder shaft (7) at the corresponding position in the axial direction from the output part of the planetary gear reduction gear (30).

[0020] In addition, an input space (14) for sludge-type debris is partitioned by a pair of partition walls (15) in the inner central part of the screw pipe (12), and the rear end outlet part of the input pipe (3) is positioned inside the input space (14) by penetrating the front side partition wall (15), and an outlet hole (16) for sludge-type debris is formed on the body of the screw pipe (12) corresponding to the periphery of the input space (14), and if necessary, an auxiliary outlet hole (17) may be additionally formed on the rear side partition wall (15) and the body of the screw pipe (12) adjacent thereto.

[0021] Accordingly, the shaft rotation speed of the cylinder body (11) driven by the above-mentioned drive motor is reduced by a constant ratio, for example, about 40.5:1, through the planetary gear reduction gear (30), and the shaft rotation speed reduced in this way is transmitted to the screw pipe (12) through the screw reduction shaft (31), thereby separating (dewatering) the sludge-type impurity components that flow from the input pipe (3) through the screw pipe (12) to the conveying screw (13) side from the liquid by centrifugal separation (dewatering) due to the difference in specific gravity, and a bearing unit (6) is additionally applied to each cylinder shaft (7) so as to more stably support the shaft rotation operation of the cylinder body (11) driven by the drive motor.

[0022] Each of the above bearing units (6) is placed on a support bracket (9) provided on the front and rear sides of the device base (2), and on the front support bracket (9), an input pipe support (4) through which an input pipe (3) passes is placed together with the bearing unit (6), and the planetary gear reducer (30) is placed on the rear support bracket (9) together with the bearing unit (6) while inserted into the interior of the reducer casing (8), and on the lower side of the device base (2), a debris discharge pipe (24) and a filtrate discharge pipe (23) are respectively installed at a position that communicates with the debris discharge port (19) and filtrate discharge port (18) of the cylinder body (11).

[0023] The planetary gear reducer (30) used in the present invention can be exemplified by a two-stage reducer with a primary reducer and a secondary reducer built in, as described in Fig. 9 of the document previously filed and registered as patent No. 10-1599972 by the applicant in 2014, Patent Application No. 36198, but it should be noted that any type of reducer can be used as long as it can reduce the shaft rotation speed of the cylinder body (11) by the drive motor at a certain ratio and transmit it to the screw pipe (12).

[0024] Also, as illustrated in FIG. 3, the load cutoff device (32) is configured to automatically cut off the power to the drive motor when an overload occurs in the operation of the centrifugal separator (10) due to factors such as an increase in the axial load of the screw pipe (12) due to an excessive inflow of sludge-type debris or foreign matter getting stuck between the conveying screw (13) and the cylinder body (11). By using the load cutoff device (32), wear or damage to the gear parts for the planetary gear reducer (30) due to the overload of the centrifugal separator (10) can be prevented in advance.

[0025] The load breaker (32) comprises an operating shaft (34) that protrudes outward through the rear drum cover of the planetary gear reducer (30), a switching lever (33) connected and installed on the operating shaft (34), a link lever (35) that supports the lower end of the switching lever (33), an extendable casing (37) connected and installed on one end of the link lever (35), and a limit switch (38) that is in contact with the other end of the link lever (35). The extendable casing (37) is formed by interposing a coil spring between the outer casing and the inner casing so that the outer casing is elastically pushed inward along the inner casing by a certain width.

[0026] Additionally, the link lever (35) is installed to enable angular movement around a link shaft (36) fixed on a support bracket (9) of a planetary gear reducer (30), and a lever stopper (39) is fixedly installed on the support bracket (9) so that the link lever (35) is not pushed out by the elastic force of a coil spring embedded in an expansion casing (37) at the lower side of the link lever (35), and the limit switch (38) is fixedly installed on the support bracket (9) so as to contact the link lever (35) at a position opposite the expansion casing (37).

[0027] Accordingly, when an overload occurs in the centrifuge (10) and the reduction function by the planetary gear reducer (30) is not manifested, the planetary gear reducer (30) and the screw pipe (12) rotate together with the cylinder body (11), and as a result, the switching lever (33) connected to the operating shaft (34) of the planetary gear reducer (30) compresses the coil spring inside the expansion casing (37) (lowering the outer casing) and simultaneously tilts the link lever (35) in one direction (counterclockwise according to FIG. 3), and the link lever (35) activates the limit switch (38) to cut off the power supply to the drive motor for the centrifuge (10), and this is also a matter described in detail in the aforementioned prior application.

[0028] As a component constituting the substantial essential part of the present invention, as shown in FIGS. 2 and FIGS. 4 respectively, the debris discharge port (19) formed on the outer surface of the tip of the cylinder body (11) is continuously and periodically crushed to allow debris scattered and attached to the inner surface of the device casing (1) to fall through the debris discharge pipe (24) of the device support (2) A crush frame (20) in the shape of a "Z" is connected and installed in a wing plate or propeller manner, and a representative example is shown in which one crush frame (20) is installed on the outer surface of the front end of the cylinder body (11) in the drawing.

[0029] As mentioned above, " It is preferable to have a configuration structure that allows a crush frame (20) in the shape of a 'Z' to be connected to the front end of a cylinder body (11) provided with a debris discharge port (19) in the form of a wing plate or propeller, thereby securing a wider crushing area for debris attached to the inside of the device casing (1), while also appropriately suppressing the phenomenon of debris being excessively scattered and attached to the inside surface of the device casing (1) through the debris discharge port (19).

[0030] To this end, the crush frame (20) comprises a pair of main frames (25) extending by a predetermined length (height) from the front and rear sides of the leading edge line of the cylinder body (11) where the debris discharge port (19) is formed, as more clearly illustrated in FIG. 2, and a connecting frame (26) connecting the upper sides of each main frame (25). "It is installed as a frame structure in the shape of a 'Z', that is, a frame structure that completely surrounds the line where the debris discharge port (19) is formed, with the line on the lower side.

[0031] As described above, the pair of main frames (25) and the upper connecting frame (26) forming the crush frame (20) are required to have a thin thickness or diameter that can easily penetrate the layer of debris attached to the inner surface of the device casing (1), while also requiring strength that can easily crush and grind even a relatively hardly fixed mass of debris. In order to simultaneously satisfy these requirements, it is preferable that the main frame (25) and the connecting frame (26) be made of a corrosion-resistant metal, such as stainless steel, having a thickness or diameter of about 0.2 to 0.5 mm.

[0032] In addition, as shown in FIG. 4, since the debris discharge port (19) is provided radially at a certain angle range along the leading edge of the cylinder body (11) (a total of 6 in the drawing), 2 to 4 crush frames (20) may be installed at an angle range of 180 to 90 degrees along the leading edge of the cylinder body (11) so that the excessive scattering of debris through each debris discharge port (19) to the inner surface of the device casing (1) can be suppressed more effectively. However, installing 5 or more crush frames (20) is not considered desirable when considering both efficiency and economic feasibility in use.

[0033] On the other hand, the longer the crush frame (20) is to the inner side of the device casing (1), the more advantageous it is in terms of removing and dropping debris. However, as the stress applied to the lower side of the main frame (25) through the upper connecting frame (26) increases unnecessarily, the risk of the crush frame (20) bending or flipping over increases. Therefore, it is preferable that the length (height) of the crush frame (20) be about 1 / 3 to 3 / 4 of the total length extending from the front end of the cylinder body (11) to the inner side of the device casing (1).

[0034] Also, based on FIG. 4, the main frame (25) forming the crush frame (20) is shown as extending vertically for a predetermined length (height) from the outer surface of the front end of the cylinder body (11). However, if viewed only from the perspective of crushing solid masses attached to the inner surface of the device casing (1) while rotating together with the cylinder body (11), it is also possible to install the main frame (25) at an angle of about 15 to 45 degrees in the right direction corresponding to the rotation direction of the cylinder body (11) in the drawing.

[0035] When the above method is applied, the stress applied from the connecting frame (26) to the bottom of the main frame (25) acts in a direction that pushes the cylinder body (11) rather than in a direction that bends the main frame (25), so the structural stability of the connection part of the crush frame (20) to the cylinder body (11) can be further increased, and the penetration angle of the crush frame (20) into the impurity layer can also be formed into a more efficient acute angle (an angle smaller than a right angle), but it also causes the disadvantage that the overall length of the main frame (25) becomes unnecessarily long.

[0036] In order to resolve all the advantages and disadvantages as described above, the crush frame (20) optimized for the centrifuge (10) according to the present invention is configured such that, as shown in FIG. 5, the upper part of each main frame (25) becomes an inclined frame (27) that extends at an angle (θ) along the rotational direction of the cylinder body (11), while the lower part of each main frame (25) is installed integrally with the cylinder body (11) by being inserted to a certain depth along the inner side of the front end of the cylinder body (11).

[0037] As previously described, the angle (θ) at which the inclined frame (27) portion is inclined from the main frame (25) is preferably about 15 to 45 degrees, and the depth of the insertion hole (28) formed in the cylinder body (11) to insert the lower side of the main frame (25) is preferably about 1 / 2 to 2 / 3 of the thickness of the body forming the cylinder body (11), and the welded portion (29) where the main frame (25) is welded to the cylinder body (11) will be formed along the upper periphery of the insertion hole (28).

[0038] According to the present invention, which is configured as described above, contaminant components scattered and attached from the cylinder body (11) to the inner surface of the device casing (1) can be continuously (or periodically) crushed and removed using a crush frame (20) that rotates together with the cylinder body (11) at the end of the cylinder body (11) provided with a contaminant discharge port (19). By doing so, the phenomenon of contaminant components accumulating and adhering in large quantities inside the device casing (1) and forming large lumps can be fundamentally prevented, thereby preventing overload of the drive motor for the centrifuge (10) and malfunction and breakdown of the centrifuge (10) caused by the adhering lumps of contaminant.

[0039] In particular, by making the upper part of the crush frame (20) inclined at a certain angle (θ) along the rotational direction of the cylinder body (11), inserting the lower part into the cylinder body (11) to a predetermined depth, and then welding it integrally with the cylinder body (11), the structural strength of the crush frame (20) itself, its service life, and the crushing performance of solidified debris can be secured to the maximum extent. Through this, an optimal centrifugal separator (10) can be provided that can dewater various debris fed in the form of sludge more quickly, efficiently, and economically, as well as treat manure and livestock wastewater using the previously filed debris comprehensive treatment device. Explanation of the symbols

[0040] 1 : Device casing 2 : Device base 3 : Inlet pipe 4 : Input pipe support 5 : Driven pulley 6 : Bearing unit 7 : Cylinder shaft 8 : Reducer casing 9 : Support bracket 10: Centrifuge 11: Cylinder body 12: Screw pipe 13 : Transfer screw 14 : Input space 15 : Buffer 16: Outlet 17: Auxiliary Outlet 18: Liquid Discharge Port 19: Debris discharge port 20: Crush frame 21: Pipe support shaft 22 : Bearing 23 : Filter discharge pipe 24 : Debris discharge pipe 25 : Main Frame 26 : Connecting Frame 27 : Inclined Frame 28 : Insertion hole 29 : Welded part 30 : Planetary gear reducer 31 : Screw reduction shaft 32 : Load circuit breaker 33 : Switching lever 34 : Actuating axis 35 : Link lever 36 : Link shaft 37 : Expansion casing 38 : Limit switch 39 : Lever stopper

Claims

Claim 1 A cylindrical cylinder body is inserted and installed inside a house-type device casing supported by a device base, and a planetary gear reducer is installed on the rear outer side of the device casing. A screw pipe equipped with a conveying screw on its outer surface is inserted and installed inside the cylinder body. At both ends of the cylinder body, a cylinder shaft that rotates by receiving power from a drive motor and a cylinder shaft that provides the input shaft of the planetary gear reducer are respectively connected and installed. Meanwhile, at both ends of the screw pipe, a pipe support shaft inserted into the cylinder shaft at the corresponding position with bearings interposed is connected and installed. An input pipe for sludge-type debris is inserted and installed into the internal space of the screw pipe by penetrating the cylinder shaft and pipe support shaft at the corresponding position axially from the front side of the device casing. At the output part of the planetary gear reducer, a screw reduction shaft is installed that penetrates the cylinder shaft at the corresponding position axially and is connected to the pipe support shaft. An input space formed by a pair of partitions is provided in the internal center of the screw pipe, and inside the input space, the input pipe of In a centrifugal separator having an outlet, a discharge hole for sludge-type debris formed on a screw pipe corresponding to the periphery of the input space, a debris discharge port and a filtrate discharge port formed respectively on the front and rear sides of the cylinder body, and a debris discharge pipe and a filtrate discharge pipe installed respectively on the lower surface of the front side and the lower surface of the rear side of the device support, wherein at least one crush frame is connected and installed on the outer circumference of the front side of the cylinder body where the debris discharge port is formed to crush and detach debris attached to the inner surface of the device casing, and the crush frame comprises a pair of main frames extending by a predetermined height from the front and rear sides of the line based on the periphery line of the front side of the cylinder body where the debris discharge port is formed, and a connecting frame connecting the upper sides of each main frame A centrifugal separator provided with a function to prevent the attachment and accumulation of foreign matter, characterized in that it is installed as a frame structure in the shape of a 'Z', the upper part of each main frame forming the crush frame becomes an inclined frame that extends at a predetermined angle along the rotational direction of the cylinder body, and the lower part of each main frame is welded integrally with the cylinder body while inserted to a predetermined depth along the inner side of the front end of the cylinder body. Claim 2 delete

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