A mechanical flip-top centrifuge and its scraper assembly

Abstract

The present invention relates to the technical field of centrifuges, and specifically relates to a mechanical flip-top centrifuge and its scraper assembly, including a base, on which a servo motor and a lead screw are provided. The lead screw is connected to a flip-top force arm through a movable block and a transverse support rod; the scraper assembly includes a scraper rod, on which an elastic scraping pressure member is connected through a scraper plate, and a plurality of elastic top members and rake-shaped scraping members are arranged outside the elastic scraping pressure member. The present invention has the following advantages compared with the prior art: By using a servo motor in cooperation with a lead screw and related components, the mechanical opening of the machine cover is realized, effectively avoiding the environmental pollution and safety hazards of the working environment compared with the use of cylinders or hydraulic cylinders; by reasonably setting the structures of the elastic scraping pressure member, the elastic top members and the rake-shaped scraping members, the rake-shaped scraping members and the elastic top members cooperate to effectively scrape the residual materials on the inner wall of the drum that are not scraped by the scraper plate. At the same time, when the elastic top members pass through the filter holes of the drum, the residual materials in the filter holes are ejected due to the elastic force.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuges, and particularly to a mechanical flip - top centrifuge and its scraper assembly. Background Art

[0002] A centrifuge can separate wet and dry materials of materials and is widely used in industries such as food and pharmaceuticals. With the rapid development of related industries, the requirements for centrifuges are gradually increasing. A centrifuge mainly includes a machine shell and a machine cover. During the cleaning process, the opening and closing of the machine cover are usually realized through a hydraulic cylinder. However, in actual applications, the hydraulic oil in the hydraulic cylinder is likely to leak, causing environmental pollution in the working environment. If the hydraulic cylinder is replaced with a pneumatic cylinder, due to the compressibility of the gas in the pneumatic cylinder drive, the working speed of the pneumatic cylinder is easily affected by the change of load, there are certain potential safety hazards. In addition, after centrifugation operation, the materials will adhere to the inner wall of the centrifuge. Since the inner wall of the drum is not an absolutely smooth surface, a certain safety distance is usually set between the scraping plate and the inner wall of the drum. In the patent application No. 201811647975.8, in order to solve the foregoing problems, a crushing component and a blowing component are provided to achieve the removal of residual materials. However, the drum is evenly distributed with filter holes. During the filtration and cleaning process, the filter holes are easily blocked, which is likely to affect the subsequent centrifugation efficiency. The existing cleaning device cannot effectively remove the materials in the filter holes. Therefore, it is necessary to improve the existing centrifuge. Summary of the Invention

[0003] The object of the present invention is to provide a mechanical flip - top centrifuge and its scraper assembly for the problems of environmental pollution caused by using a hydraulic cylinder to flip the cover in the existing centrifuge and the inability to clean the filter holes when cleaning the drum.

[0004] To solve the above - mentioned technical problems, the present invention provides a mechanical flip - top centrifuge, including a base. A machine shell is provided on the base. The machine cover is movably connected to the top of the machine shell. Two flip - cover force arms are provided on one side of the top of the machine cover. A flip - cover support is provided on the outer side of the machine shell corresponding to the position of the flip - cover force arms. The ends of the flip - cover force arms and the flip - cover support are rotatably connected through a rotating shaft. A stroke support is provided on the base at a position outside the two flip - cover supports. A horizontally penetrating stroke hole is provided on the stroke support. A servo motor is fixed at the position of the base in the middle of the stroke support. The upper end of the servo motor is connected to a vertically arranged lead screw. A movable block that is helically connected to the lead screw is provided on the lead screw. Both ends of the movable block are connected to a transverse support rod. The outer end of the transverse support rod penetrates through the stroke hole and is fixedly connected to an outer clamping block. A limit block is connected to the top of the lead screw. A rotating connection block is rotatably connected to the outside of the transverse support rod. A rotating rod is connected to the outside of the rotating connection block. The top of the rotating rod is connected to a U - shaped connecting piece. The U - shaped connecting piece and the rear end of the flip - cover force arm are rotatably connected through a pin shaft.

[0005] When the movable block abuts against the limit block, the machine cover is in the closed state. When the movable block is at the bottom of the lead screw, the machine cover is in the open state.

[0006] In the present invention, the hood driving part is replaced by a mechanical device, avoiding the use of hydraulic cylinders or air cylinders, which can avoid potential safety hazards and control the opening and closing of the hood at a uniform speed. At the same time, the control hydraulic cylinder of the scraper rod in the prior art is replaced by an air cylinder, which can effectively avoid the pollution of the environment caused by hydraulic oil leakage. Since the scraper rod has no excessive load, there is no potential safety hazard. The improved technical solution is as follows: A scraper air cylinder is provided at the top of the hood. A stroke control connector is provided at the top of the scraper air cylinder. Angle control connectors are provided at both lower ends of the scraper air cylinder. A pipeline combing box is provided on the base at a position on one side of the casing. A cylinder air pipe is provided in the pipeline combing box. The bottom of the air pipe is connected to the air cylinder, and the top of the air pipe is respectively connected to the stroke control connector and the angle control connector.

[0007] By providing bearings, the friction coefficient during the rotation of the rotating connection block is reduced, ensuring its rotation accuracy. The rotating connection block is connected to the transverse support rod through a rotating bearing.

[0008] In order to realize the automatic opening and closing of the hood, a control device is further included. Contact sensors are respectively provided at the top and bottom of the movable block. The contact sensors are electrically connected to the control device, and the control device is electrically connected to the servo motor.

[0009] A scraper assembly of a mechanical flip centrifuge includes a scraper shaft. A scraper rod is connected to the scraper shaft. A baffle plate and a scraper plate are successively provided on the scraper rod. An elastic scraping pressure member is fixed outside the scraper plate. The elastic scraping pressure member includes a connecting bottom plate, an intermediate connecting plate, and a pressing plate that are successively bent inward. The angle between the intermediate connecting plate and the connecting bottom plate is an acute angle, and the angle between the pressing plate and the connecting bottom plate is an acute angle.

[0010] A plurality of elastic top members and rake-type scraping members are provided in the vertical direction on the outer side of the pressing plate. When the elastic top member passes through the filter hole, the material in the filter hole is ejected, and in other parts where there is no filter hole, it is used to scrape off the material attached to the inner wall of the drum. The rake-type scraping member is used to scrape off the material attached to the inner wall of the drum.

[0011] The elastic top member includes a left bottom plate, a left connecting plate, a right connecting plate, and a right bottom plate whose head and tail are connected by an arc surface. The angle between the left bottom plate and the left connecting plate is an obtuse angle, the angle between the left connecting plate and the right connecting plate is an acute angle, and the angle between the right connecting plate and the right bottom plate is an acute angle. The whole elastic top member can realize the pressing on the inner wall of the drum and can adapt to the uneven inner wall surface.

[0012] The rake-type scraping member includes a fixed bottom plate and rake rods uniformly distributed in the vertical direction. The rake rods are inclined away from the front end of the scraper plate and inclined towards the rear of the rotation of the drum, which can reduce the resistance to the rotation of the drum while pressing.

[0013] To ensure the smooth removal of materials from the inner wall of the drum, the end of the rake rod is spherical, which can effectively reduce the resistance to the drum; spherical protrusions are evenly distributed on the outer ridge at the connection of the left connecting plate and the right connecting plate, reducing the friction with the inner wall of the drum when sliding on the part of the inner wall of the drum without filter holes.

[0014] Both the elastic scraping pressure member and the elastic top member are integrally formed structures made of 3Cr13 stainless steel. This material has a certain elasticity while ensuring strength, so that the rake scraping member on the scraping pressure member always abuts against the inner wall of the drum, and the elastic top member can extend into the filter hole to eject materials when passing through the filter hole;

[0015] It is realized by the following technical solution. A drum is provided inside the casing, and filter holes are evenly distributed on the side wall of the drum. When the scraper shaft rotates to the scraping state, the rake scraping member abuts against the non-filter hole part of the inner wall of the drum, and the elastic top member is in interference fit with the non-filter hole part of the inner wall of the drum;

[0016] The distance between the outer sides of the rear ends of the left connecting plate and the right connecting plate of the elastic top member is less than the inner diameter of the filter hole.

[0017] To ensure the effective operation of the elastic top member, the descending distance controlled by the scraper cylinder for the scraper shaft is always a multiple of the distance between adjacent filter holes, ensuring the height correspondence between the elastic top member and the filter holes during the rotation of the drum.

[0018] The present invention has the following advantages compared with the prior art: By using a servo motor in cooperation with a lead screw and related components, the mechanical opening of the machine cover is realized, effectively avoiding the pollution of the working environment and potential safety hazards compared with the use of cylinders or hydraulic cylinders;

[0019] By reasonably setting the structures of the elastic scraping pressure member, the elastic top member and the rake scraping member, the scraper cylinder rotates the scraper assembly to a suitable position, enabling the rake scraping member and the elastic top member to cooperate, effectively scraping the residual materials on the inner wall of the drum that are not scraped by the scraper plate, and at the same time, when the elastic top member passes through the filter hole of the drum, the residual materials in the filter hole are ejected due to the elastic force;

[0020] The centrifuge in the present invention can reduce manual intervention and operation, improve the discharging efficiency, reduce the adverse effects caused by filter hole blockage, and at the same time avoid polluting the working environment during the operation of the hydraulic cylinder, meeting the production requirements of the pharmaceutical industry. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] Figure 2 is a schematic structural diagram when the machine cover is opened.

[0023] Figure 3 is a schematic structural diagram of the scraper assembly.

[0024] Figure 4 It is a schematic structural diagram of an elastic ejector.

[0025] Figure 5 It is a schematic structural diagram of a rake-type scraping member.

[0026] Figure 6 It is a schematic diagram of the positional relationship between the scraper assembly and the drum.

[0027] Figure 7 It is a schematic structural diagram of the elastic ejector passing through the filter hole.

[0028] Figure 8 It is Figure 7 The enlarged view at position A in

[0029] Figure 9 It is a schematic structural diagram of the elastic ejector passing through the non-filter hole.

[0030] Figure 10 It is Figure 8 The enlarged view at the position of

[0031] Wherein, 1 - base, 2 - housing, 21 - drum, 22 - filter hole, 3 - machine cover, 31 - flip cover force arm, 32 - flip cover bracket, 33 - rotating shaft, 4 - scraper cylinder, 41 - angle control connector, 42 - stroke control connector, 43 - scraper shaft, 5 - pipeline combing box, 51 - pipeline outlet, 6 - stroke bracket, 61 - stroke hole, 7 - servo motor, 71 - lead screw, 72 - rotating connection block, 73 - movable block, 74 - transverse support rod, 75 - outer clamping block, 76 - rotating rod, 77 - rotating connection block, 78 - pin, 79 - U-shaped connecting piece, 8 - scraper rod, 81 - material retaining plate, 82 - scraper plate, 9 - elastic scraping pressure member, 911 - connecting bottom plate, 912 - intermediate connecting plate, 913 - pressing plate, 92 - elastic ejector, 921 - left bottom plate, 922 - left connecting plate, 923 - right connecting plate, 924 - right bottom plate, 925 - spherical protrusion, 93 - rake-type scraping member, 931 - fixed bottom plate, 932 - rake rod. Specific embodiments

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] As shown Figure 1-2 in the figure, a mechanical flip-top centrifuge includes a base 1, on which a casing 2 is provided. The top of the casing 2 is movably connected to a cover 3. On one side of the top of the cover 3, two flip-top force arms 31 are provided. At a position corresponding to the flip-top force arms 31 outside the casing 3, a flip-top bracket 32 is provided. The flip-top bracket 32 is vertically arranged outside the casing 2. The lower end of the flip-top force arm 31 and the outer rear end of the flip-top bracket 32 are rotatably connected through a rotating shaft 33. On the base 1, at a position outside the two flip-top brackets 32, a stroke bracket 6 is provided. The stroke bracket 6 is provided with a horizontally penetrating stroke hole 61. In the middle position of the base 1 where the stroke bracket 6 is located, a servo motor 7 is fixed. The upper end of the servo motor 7 is connected to a vertically arranged lead screw 71. On the lead screw 71, a movable block 73 that is helically connected to the lead screw is provided. Both ends of the movable block 73 are connected to a transverse support rod 74. The outer end of the transverse support rod 74 penetrates through the stroke hole 61 and is fixedly connected to an outer clamping block 75. The top of the lead screw 71 is connected to a limit block 72; the rotating connection block 72 is connected to the transverse support rod 74 through a rotating bearing. The outer side of the rotating connection block 77 is connected to a rotating rod 76. The top of the rotating rod 76 is connected to a U-shaped connecting piece 79. The U-shaped connecting piece 79 and the rear end of the flip-top force arm 31 are rotatably connected through a shaft pin 78;

[0036] It also includes a control device. At the top and bottom of the movable block 73, contact sensors are respectively provided. The contact sensors are electrically connected to the control device, and the control device is electrically connected to the servo motor 7; the contact sensors cooperate with the control device. When it is necessary to open the cover 3, the servo motor 7 is controlled to start rotating. The movable block 73 moves downward, driving the support cross bar 74 to move downward. The support cross bar 74 drives the rear end of the flip-top force arm 31 to move downward through the rotating rod 76. The flip-top force arm 31 rotates with the connection point with the flip-top bracket 32 as the fulcrum, driving the cover 3 to slowly open. When the movable block 73 contacts the bottom of the lead screw 71, the cover 3 is in the open state and the servo motor 7 stops rotating; when it is necessary to close, the servo motor 7 rotates in the reverse direction, and the working process is opposite to the foregoing. Until the movable block 73 contacts the bottom of the limit block 72, the servo motor 7 stops rotating. At this time, the cover 3 is in the closed state.

[0037] As shown Figure 1-2 in the figure (where Figure 2 in order to facilitate observation, some components are removed), on the top of the cover 3, a scraper cylinder 4 is provided. At the top of the scraper cylinder 4, a stroke control connector 42 is provided. At both lower ends of the scraper cylinder 4, angle control connectors 41 are provided. On the base 1, at a position on one side of the casing 2, a pipeline combing box 5 is provided. At the upper end of the pipeline combing box 5, a pipeline outlet 51 is provided. Inside the pipeline combing box 5, there is a cylinder air pipe. The bottom of the air pipe is connected to the cylinder, and the top of the air pipe is respectively connected to the stroke control connector 42 and the angle control connector 41.

[0038] As shown Figures 3-10 in the figure, a scraper assembly of a mechanical flip - top centrifuge includes a scraper shaft 43. A scraper rod 8 is connected to the scraper shaft 43. A material baffle 81 and a scraper plate 82 are successively arranged on the scraper rod 8 (which is the prior art in this field and has nothing to do with the improvement points of the present invention, so it will not be elaborated here). An elastic scraping pressure member 9 is fixed outside the scraper plate 82. The elastic scraping pressure member 9 includes a connecting bottom plate 911, an intermediate connecting plate 912, and a pressing plate 913 that are successively bent inward. The angle between the intermediate connecting plate 912 and the connecting bottom plate 911 (the angle here refers to the angle on the inner side of the bend) is an acute angle, and the angle between the pressing plate 913 and the connecting bottom plate 911 (the angle here is the angle between the extension line of the pressing plate and the extension line of the connecting bottom plate) is an acute angle;

[0039] A plurality of elastic top members 92 and rake - type scraping members 93 are arranged in the vertical direction on the outer side of the pressing plate 913;

[0040] The elastic top member 92 includes a left bottom plate 921, a left connecting plate 922, a right connecting plate 923, and a right bottom plate 924 whose head and tail are connected by an arc surface. The angle between the left bottom plate 921 and the left connecting plate 922 (the angle here refers to the angle on the inner side of the bend) is an obtuse angle, the angle between the left connecting plate 922 and the right connecting plate 923 is an acute angle, and the angle between the right connecting plate 923 and the right bottom plate 924 is an acute angle. The overall structure of the elastic top member 92 can achieve the pressing of the inner wall of the drum 21 and can adapt to the uneven inner wall surface; spherical protrusions 925 are evenly distributed on the outer ridge at the connection of the left connecting plate 922 and the right connecting plate 923;

[0041] The rake - type scraping member 93 includes a fixed bottom plate 931 and rake rods 932 that are evenly distributed in the vertical direction. The end of the rake rod 932 is spherical. In this embodiment, the number of rake rods 932 is 3. The rake rods 932 are inclined in the direction away from the front end of the scraper plate 82, that is, inclined towards the rotation rear of the drum 21, which can reduce the resistance to the rotation of the drum 21 while pressing;

[0042] A drum 21 is arranged inside the machine shell 2. Filter holes 22 are evenly distributed on the side wall of the drum 21. The distance between the outer sides of the rear ends of the left connecting plate 922 and the right connecting plate 923 of the elastic top member 92 is less than the inner diameter of the filter holes 22;

[0043] When the control device controls the scraper cylinder 4 to rotate the scraper shaft 43 to the scraping state, the rake - type scraping member 93 abuts against the non - filter - hole part of the inner wall of the drum 21, and the elastic top member 92 is in interference fit with the non - filter - hole part of the inner wall of the drum 21. Therefore, the elastic top member 92 is in the extrusion state as Figures 9-10 described above and will perform a certain amount of elastic energy storage; when the elastic top member 92 passes through the filter hole 22, the squeezed elastic top member 92 instantly bounces open and ejects the material in the filter hole 22;

[0044] The elastic ejector 92 is used to scrape off the materials adhering to the inner wall of the drum 21 in other parts where there are no filter holes; the rake scraping member 93 is used to scrape off the materials adhering to the inner wall of the drum 21.

[0045] Both the elastic scraping pressure member 9 and the elastic ejector 92 are integrally formed structures made of 3Cr13 stainless steel. This material has a certain elasticity while ensuring strength, so that the rake scraping member 93 on the scraping pressure member 9 always abuts against the inner wall of the drum 21, and the elastic ejector 92 can extend into the filter hole 22 to eject materials when passing through the filter hole 22. In order to ensure the effective operation of the elastic ejector, the lowering distance of the scraper cylinder 4 to control the scraper shaft 43 is always a multiple of the distance between adjacent filter holes 22, ensuring the height correspondence between the elastic ejector 92 and the filter hole 22 during the rotation of the drum 21.

[0046] Since the scraper cylinder in the present invention is connected to the air cylinder and can introduce high-pressure gas through the scraper shaft, and by setting nozzles at appropriate positions on the elastic scraping pressure member to assist in blowing off material residues, relevant content has been disclosed in the prior art and is not an essential technical feature of the present invention. If those skilled in the art make relevant modifications based on the disclosed technology of the present invention, it should also fall within the protection scope of the present invention.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A scraper assembly for a mechanical flip-top centrifuge, comprising a scraper shaft, a scraper rod is connected to the scraper shaft, and a material baffle and a scraper plate are successively arranged on the scraper rod, characterized in that, An elastic scraping pressure member is externally fixed to the scraper plate. The elastic scraping pressure member includes a connecting bottom plate, an intermediate connecting plate, and a pressing plate that are sequentially bent inward. The angle between the intermediate connecting plate and the connecting bottom plate is an acute angle, and the angle between the pressing plate and the connecting bottom plate is an acute angle; A plurality of elastic top members and rake-shaped scraping members are provided in the vertical direction on the outer side of the pressing plate; The elastic top member includes a left bottom plate, a left connecting plate, a right connecting plate, and a right bottom plate whose head and tail are connected by an arc surface. The angle between the left bottom plate and the left connecting plate is an obtuse angle, the angle between the left connecting plate and the right connecting plate is an acute angle, and the angle between the right connecting plate and the right bottom plate is an acute angle; The rake-shaped scraping member includes a fixed bottom plate and rake rods evenly distributed in the vertical direction. The rake rods are inclined in a direction away from the front end of the scraper plate; The mechanical flip centrifuge includes a base. A casing is provided on the base. A drum is provided inside the casing. Filter holes are evenly distributed on the side wall of the drum. When the scraper shaft is in the scraping state, the elastic top member and the non-filter hole part of the inner wall of the drum are mutually extruded. When the elastic top tip passes through the filter hole, the extruded elastic top member instantly spreads out and ejects the material in the filter hole.

2. The scraper assembly for a mechanical flip-top centrifuge according to claim 1, characterized in that, The end of the rake rod is spherical; spherical protrusions are evenly distributed on the outer ridge at the connection of the left connecting plate and the right connecting plate.

3. The scraper assembly for a mechanical flip-top centrifuge according to claim 1, characterized in that, Both the elastic scraping pressure member and the elastic top member are integrally formed structures made of 3Cr13 stainless steel.

4. The scraper assembly for a mechanical flip-top centrifuge according to claim 1, characterized in that, When the scraper shaft rotates to the scraping state, the rake-shaped scraping member abuts against the non-filter hole part of the inner wall of the drum, and the elastic top member is in interference fit with the non-filter hole part of the inner wall of the drum; The distance between the outer sides of the rear ends of the left connecting plate and the right connecting plate of the elastic top member is smaller than the inner diameter of the filter hole.

5. A mechanical flip-top centrifuge comprising the scraper assembly according to any one of claims 1-4, the top of the machine shell is movably connected to the machine cover, two flip force arms are arranged on one side of the top of the machine cover, and a flip bracket is arranged on the outer side of the machine shell corresponding to the position of the flip force arms, and the ends of the flip force arms and the flip bracket are rotationally connected through a rotating shaft, characterized in that, A travel support is provided at a position on the base outside the two flip brackets. A horizontally penetrating travel hole is provided on the travel support. A servo motor is fixed at a position on the base in the middle of the travel support. The upper end of the servo motor is connected to a vertically arranged lead screw. A movable block that is helically connected to the lead screw is provided on the lead screw. Both ends of the movable block are connected to a transverse support rod. The outer end of the transverse support rod penetrates through the travel hole and is fixedly connected to an outer clamping block. A limit block is connected to the top of the lead screw; A rotating connection block is rotatably connected to the outside of the transverse support rod. A rotating rod is connected to the outside of the rotating connection block. The top of the rotating rod is connected to a U-shaped connecting piece. The U-shaped connecting piece is rotatably connected to the rear end of the flip force arm through a pin; When the movable block abuts against the limit block, the machine cover is in the closed state. When the movable block is at the bottom of the lead screw, the machine cover is in the open state.

6. The mechanical flip-top centrifuge according to claim 5, a scraper cylinder is arranged on the top of the machine cover, a stroke control connection head is arranged on the top of the scraper cylinder, and angle control connection heads are arranged at both lower ends of the scraper cylinder, characterized in that, A pipeline combing box is provided at a position on the base on one side of the casing. A cylinder air pipe is provided inside the pipeline combing box. The bottom of the air pipe is connected to a cylinder, and the top of the air pipe is respectively connected to a travel control connection head and an angle control connection head.

7. The mechanical flip-top centrifuge according to claim 5, characterized in that, The rotating connection block is connected to the transverse support rod through a rotating bearing.

8. The mechanical flip-top centrifuge according to claim 5, characterized in that, A control device is further included. Contact sensors are respectively provided at the top and bottom of the movable block. The contact sensors are electrically connected to the control device, and the control device is electrically connected to the servo motor.

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