Separating and filtering device for veterinary drug preparation

Abstract

The invention relates to the field of veterinary drug preparation, in particular to a separating and filtering device for veterinary drug preparation, which comprises a raw water tank, a water supply pump arranged at the output end of the raw water tank and a filtering unit arranged at the output end of the water supply pump, specifically, the filtering unit comprises a shell on the outer ring and a filtering membrane on the inner ring, and the output end of the shell is communicated with a return pipe; one end of the shell is communicated with a discharge pipe used for discharging filtrate filtered by the filter membrane, the filter membrane is provided with a through hole allowing feed liquid to be filtered to pass through, and a sealing plug perpendicular to the through hole and used for preventing the feed liquid from passing through is arranged above the shell; the control mechanism is used for driving the sealing plug to ascend and descend, and the control mechanism drives the sealing plug to ascend and descend so as to control the pressure in the filtering membrane. According to the scheme, by intermittently controlling the size of the gap and synchronously matching with the change of the power of the water supply pump, high-speed filtration can be ensured, and meanwhile, large particles are prevented from blocking the filter unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of veterinary medicine preparation, in particular to a separation and filtration device for veterinary medicine preparation. BACKGROUND

[0002] In the preparation of veterinary medicine, various medicinal materials and medicinal liquids need to be separated and filtered. The conventional separation and filtration method is to filter through centrifugation or filter screen. In the separation of fine particles, cross-flow filtration is usually used. For example, cross-flow filtration is used in the preparation of pig spleen transfer factor injection. Cross-flow filtration refers to the flow of feed liquid parallel to the membrane surface under the push of a pump. The shear force generated by the flow carries away the particles remaining on the membrane surface, so that the pollution layer is maintained at a relatively thin level. Under the action of pressure, the feed liquid is filtered out in a tangential manner, continuously washing the membrane surface and carrying away the adhered particles, preventing the filter membrane from being blocked. The concentration of particles in the unfiltered feed liquid gradually increases, and when it reaches a certain level, it is discharged, realizing solid-liquid separation.

[0003] For cross-flow filtration, the structure usually includes a buffer tank, a circulating pump and a filtration chamber. The circulating pump continuously sends the feed liquid in the buffer tank into the filtration chamber. The remaining feed liquid flows back to the buffer tank from the filtration chamber after filtration. The filtrate obtained by filtration is output through the outer chamber. Although this scheme can achieve better filtration effect, the problem of adhesion and blockage may occur during filtration. The existing technology uses backwashing to clean the membrane surface. However, since backwashing is not performed continuously during filtration, but only at certain periods or after each filtration, there are still some stubborn particles remaining on the inner wall of the filter membrane after each cleaning. In the long run, these adhered particles will still form a blocked state, causing the filter membrane to fail to function normally, thereby reducing the filtration efficiency. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides the following technical solutions:

[0005] A separation and filtration device for veterinary medicine preparation, comprising: a raw water tank, a water supply pump arranged at the output end of the raw water tank, a filtration unit arranged at the output end of the water supply pump, and a control mechanism for driving the lifting of a sealing plug.

[0006] Specifically, the filtration unit comprises an outer shell of an outer ring and a filter membrane of an inner ring. The output end of the outer shell is communicated with a backflow pipe, the other end of the backflow pipe is communicated to the inside of the raw water tank, one end of the outer shell is communicated with a discharge pipe for discharging the filtrate filtered by the filter membrane, the filter membrane is provided with a through hole for accommodating the feed liquid to pass through, a sealing plug is arranged above the outer shell and perpendicular to the through hole to hinder the passage of the feed liquid, and the control mechanism drives the lifting of the sealing plug to control the pressure in the filter membrane.

[0007] As an improvement of the above technical solution, the end of the through hole in contact with the sealing plug is provided with a boss-shaped outlet, and the sealing plug is boss-shaped.

[0008] As an improvement of the above technical solution, the bottom end of the sealing plug is provided with a connecting rod, the connecting rod is sleeved in the through hole, the outer surface of the connecting rod is fixedly provided with a flow guide sleeve, the outer circle of the flow guide sleeve is not in contact with the inner wall of the through hole, the flow guide sleeve is in the shape of a tapered cylinder, and the liquid flows into the flow guide sleeve from the large hole end and flows out from the small hole end.

[0009] As an improvement of the above technical solution, the edge of the flow guide sleeve is provided with a cavity, and the cavity moves up and down to stir the liquid to flush the filter membrane.

[0010] As an improvement of the above technical solution, a sewage tee is arranged between the water supply pump and the shell, a control valve one for alternate operation is connected to the end of the sewage tee away from the shell and connected to the water supply pump, a backwashing tee is arranged at the end of the discharge pipe away from the shell, control valve twos for alternate operation are connected and penetrate through both ends of the backwashing tee, and one of the control valve twos is connected to the backwashing mechanism.

[0011] As an improvement of the above technical solution, a backflow tee is connected to the backflow pipe, electromagnetic valve ones for controlling the opening and closing size are arranged at both outlets of the backflow tee, one of the electromagnetic valve ones is connected and penetrates through a branch pipe, a water inlet tee is arranged at the water inlet end of the water supply pump, electromagnetic valve twos for controlling the opening and closing size are connected to both inlets of the water inlet tee, and one of the electromagnetic valve twos is connected and penetrates through the branch pipe.

[0012] As an improvement of the above technical solution, the control mechanism comprises an electromagnetic telescopic sleeve, and the electromagnetic telescopic sleeve is fixedly installed above the shell.

[0013] As an improvement of the above technical solution, the control mechanism comprises a hydraulic telescopic sleeve installed at the top end of the shell, the control end of the hydraulic telescopic sleeve is arranged outside the shell, metering pumps are connected and penetrate through both the liquid inlet end and the liquid outlet end of the hydraulic telescopic sleeve, a circulation pipe is connected and penetrates through one end of the metering pump away from the hydraulic telescopic sleeve, the circulation pipe extends into the shell, a sampling tee is connected and penetrates through the outlet end of the metering pump connected to the liquid inlet side of the hydraulic telescopic sleeve, and a sealing unit is arranged at the end of the sampling tee away from the metering pump and the circulation pipe.

[0014] As an improvement of the above technical solution, the two circulation pipes are jointly connected with a double-channel sleeve, and the double-channel sleeve extends into the shell.

[0015] As an improvement of the above technical solution, the shell is divided into a fixed part at the upper end and a replacement part at the lower end, and the control mechanism and the backflow pipe are connected with the fixed part.

[0016] The top end of the replacement part is flange connected with the fixed part, the bottom end of the replacement part is threadedly connected with the blowdown tee through a double-end threaded sleeve, the inside of the replacement part is provided with a filter ring connected with the discharge pipe, a filter membrane is arranged inside the filter ring, the top end of the filter membrane is clamped with the inwardly protruding part of the top end of the replacement part, and an extrusion ring is threadedly connected with the top end of the replacement part.

[0017] The beneficial effects of the present application are:

[0018] 1、The sealing plug in the scheme can be controlled by the control mechanism to move up and down, thereby controlling the opening size between the sealing plug and the through hole; when the opening is small or the power of the water supply pump is increased, the pressure of the material liquid accumulated in the filter unit is increased, so that the filtering efficiency is increased; when the pressure of the water supply pump is reduced and the gap is increased, the pressure in the filter unit is reduced, so that the large particles pressed and attached to the surface of the filter unit are no longer attached to the surface of the filter unit and flow out with the liquid flow; by intermittently controlling the size of the gap and synchronously matching the change of the power of the water supply pump, the large particles can be prevented from blocking the filter unit while ensuring high-speed filtering.

[0019] 2、The bottom end of the sealing plug is provided with a connecting rod, the connecting rod is sleeved in the inside of the through hole, a flow guide sleeve is fixedly installed on the outer surface of the connecting rod, the outer circle of the flow guide sleeve does not contact the inner wall of the through hole, the flow guide sleeve is opened from large to small according to the flow direction of the material liquid, the material liquid flows out from the small hole end of the flow guide sleeve, the flow guide sleeve is equivalent to a Venturi tube, and the liquid flow can be accelerated and turbulent flow can be formed through such a structure, so that the filtering efficiency can be improved; meanwhile, the connecting rod and the sealing plug are fixedly connected, and the material liquid to be filtered can be disturbed by the flow guide during the up-down movement of the sealing plug, so that the filtering efficiency can be improved. In addition, the edge of the flow guide sleeve is provided with a cavity, the cavity moves up and down to stir the material liquid to wash the filter membrane, and the filter membrane is washed by fluid instead of mechanical friction, so that the filter membrane can be prevented from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the present application;

[0021] Figure 2 It is a semi-partial structure view of the shell of the present application;

[0022] Figure 3 It is Figure 2 It is an enlarged structure view of A in the middle;

[0023] Figure 4 It is a semi-partial structure view of the filter membrane of the present application;

[0024] Figure 5A perspective view of the control mechanism of the present application;

[0025] Figure 6 An internal structure view of the electromagnetic telescopic sleeve of the present application;

[0026] Figure 7 A semi-sectional view of the sealing plug of the present application;

[0027] Figure 8 A perspective view of Figure 7 An enlarged structure view at B in the middle.

[0028] The figure marks: 1, raw water tank; 2, water supply pump; 3, filter unit; 31, outer shell; 311, discharge pipe; 312, fixed part; 313, replacement part; 314, double-thread sleeve; 315, filter ring; 316, extrusion ring; 317, support frame; 318, connecting frame; 32, filter membrane; 321, through hole; 322, sealing plug; 323, outlet; 33, connecting rod; 331, flow guide sleeve; 332, cavity; 303, backflow pipe; 4, control mechanism; 401, hydraulic telescopic sleeve; 402, metering pump; 403, circulation pipe; 404, sampling tee; 405, double-path sleeve; 406, electromagnetic telescopic sleeve; 5, blowdown tee; 6, control valve one; 7, backwash tee; 8, control valve two; 9, backflow tee; 10, electromagnetic valve one; 11, branch pipe; 12, water inlet tee; 13, electromagnetic valve two. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0030] In the prior art, in order to solve the problem of blockage of the adhering substances on the membrane surface, a backwashing method is used to clean the membrane surface. However, since the backwashing is not performed during the filtration process, but is performed at each filtration or at a certain period, there are still some stubborn particles remaining on the inner wall of the filter membrane after each cleaning. In the long-term use, these adhering particles will still form a blockage state, which causes the filter membrane to be unable to normally play the filtering function, and further causes the problem of reduced filtration efficiency.

[0031] In order to solve the above problem, as shown in Figures 1-8 a veterinary drug preparation separation and filtration device is provided, which comprises a raw water tank 1, a water supply pump 2 arranged at the output end of the raw water tank 1, and a filter unit 3 arranged at the output end of the water supply pump 2.

[0032] Specifically, the filter unit 3 comprises an outer shell 31 of an outer ring and a filter membrane 32 of an inner ring, an output end of the outer shell 31 is communicated with a return pipe 303, the other end of the return pipe 303 is communicated to the inside of the raw water tank 1, one end of the outer shell 31 is communicated with a discharge pipe 311 for discharging filtrate filtered by the filter membrane 32, the filter membrane 32 is provided with a through hole 321 for accommodating the passage of the material liquid to be filtered, the upper portion of the outer shell 31 is provided with a sealing plug 322 perpendicular to the through hole 321 to hinder the passage of the material liquid, a control mechanism 4 for driving the sealing plug 322 to ascend and descend, and the control mechanism 4 drives the sealing plug 322 to ascend and descend to control the pressure in the filter membrane 32.

[0033] During the process of controlling the sealing plug 322 to ascend and descend, the gap between the through hole 321 and the sealing plug 322 changes, when the gap at the sealing plug 322 becomes larger, the pressure in the filter membrane 32 becomes smaller, and when the gap at the sealing plug 322 becomes smaller, the pressure in the filter membrane 32 becomes larger, the change of the pressure in the filter membrane 32 is achieved by controlling the sealing plug 322 to ascend and descend, and the change of the pressure can accelerate the filtering speed of the filter membrane 32, and when the ascending and descending operations are repeatedly performed in a cycle, the pressure in the filter membrane 32 constantly changes, in this case, the state of the material liquid in the inside can greatly fluctuate, and this fluctuation can form a cleaning function of impact state to the inner wall of the filter membrane 32.

[0034] In the embodiment, the filter membrane 32 adopts a ceramic membrane, the inner wall of the membrane hole of the ceramic membrane is provided with a plurality of filter holes, the material meeting the filtering requirement can flow out from the filter holes into the cavity between the outer shell 31 and the filter membrane 32, and is discharged through the discharge pipe 311.

[0035] In an embodiment, please refer to Figure 4 and Figure 5 , the end of the through hole 321 in contact with the sealing plug 322 is provided with a boss-shaped outlet 323, and the sealing plug 322 is in the shape of a boss.

[0036] Since the connection state between the sealing plug 322 and the outlet 323 is in the shape of a boss, the sealing function can be more easily achieved when being extruded, and the sealing effect of the connection is better.

[0037] In an embodiment, please refer to Figure 7 and Figure 8 , the bottom end of the sealing plug 322 is provided with a connecting rod 33, the connecting rod 33 is sleeved in the inside of the through hole 321, the outer surface of the connecting rod 33 is fixedly installed with a flow guide sleeve 331, the outer ring of the flow guide sleeve 331 is not in contact with the inner wall of the through hole 321, the flow guide sleeve 331 is in the shape of a tapered cylinder, and the material liquid flows into the flow guide sleeve 331 from the large hole end and flows out from the small hole end.

[0038] The flow guide sleeve 331 forms a structure similar to a Venturi tube, which can accelerate the flow of liquid and form a turbulent flow after flowing out of the flow guide sleeve 331. The turbulent flow can disturb the flow state of the internal liquid, which can drive the liquid to contact the filter holes on the inner wall of the through hole 321 more fully, thereby improving the filtering efficiency. At the same time, the connecting rod 33 and the sealing plug 322 are fixedly connected, and the sealing plug 322 moves up and down, which can drive the flow guide sleeve 331 to move through the connecting rod 33. Since the sealing plug 322 is in a state of reciprocating lifting, the flow guide sleeve 331 can continuously disturb the liquid in the through hole 321, thereby improving the overall filtering efficiency.

[0039] In one embodiment, referring to Figure 8 , the edge of the flow guide sleeve 331 is provided with a cavity 332. The cavity 332 moves up and down to stir the liquid to wash the filter membrane 32. Unlike traditional mechanical friction and scraping of adhering substances, the cleaning is achieved by the disturbance of the up and down moving liquid. This cleaning does not directly touch the inner wall of the filter membrane 32, which can avoid damaging the filter membrane 32. Since the disturbance exists during the filtering process, there is no problem of stubborn adhering substances.

[0040] In one embodiment, referring to Figure 1 and Figure 2 , the sewage three-way pipe 5 is provided between the water supply pump 2 and the shell 31. The sewage three-way pipe 5 is connected with the control valve one 6 which works alternately at the end away from the shell 31 and the connection end of the water supply pump 2. The discharge pipe 311 is provided with a backwashing three-way pipe 7 at the end away from the shell 31. The backwashing three-way pipe 7 is connected with the control valve two 8 which works alternately at both ends away from the shell 31 and penetrates through. One of the control valve two 8 is connected with the backwashing mechanism.

[0041] After being used for a certain period of time, the backwashing mechanism is turned on to make the water flow downward, thereby backwashing. The sewage is discharged through the sewage end of the sewage three-way pipe 5. The liquid in the filter membrane 32 flows from top to bottom, which can make the large particle adhering substances fall under the action of gravity. If the liquid in the filter membrane 32 flows from bottom to top, the sealing plug 322 needs to completely block the through hole 321 during the backwashing process.

[0042] In one embodiment, referring to Figure 1 , the backflow pipe 303 is connected with a backflow three-way pipe 9. The backflow three-way pipe 9 is provided with electromagnetic valve one 10 which controls the opening and closing size at both outlet ends. One of the electromagnetic valve one 10 is connected with and penetrates through the branch pipe 11. The water inlet end of the water supply pump 2 is provided with a water inlet three-way pipe 12. The water inlet three-way pipe 12 is connected with electromagnetic valve two 13 which controls the opening and closing size at both inlets. One of the electromagnetic valve two 13 is connected with and penetrates through the branch pipe 11.

[0043] Through the arrangement, the filtered liquid and the liquid without filtering can flow back to the raw water tank 1 through the reflux pipe 303 to be mixed again and re-enter the filtering unit 3 to be filtered again, so that the filtering function is realized in a reciprocating cycle.

[0044] For further improvement of the scheme, please refer to Figure 1 and Figure 5 The control mechanism 4 comprises a hydraulic telescopic sleeve 401 installed at the top end of the shell 31, a reset spring is arranged in the hydraulic telescopic sleeve 401, the control end of the hydraulic telescopic sleeve 401 is arranged outside the shell 31, the liquid inlet end and the liquid outlet end of the hydraulic telescopic sleeve 401 are connected and penetrated by a metering pump 402, the end of the metering pump 402 away from the hydraulic telescopic sleeve 401 is connected and penetrated by a circulating pipe 403, the circulating pipe 403 extends to the inside of the shell 31, the outlet end of the metering pump 402 connected with the liquid inlet end of the hydraulic telescopic sleeve 401 is connected and penetrated by a sampling tee 404, and the end of the sampling tee 404 away from the metering pump 402 and the circulating pipe 403 is provided with a sealing unit.

[0045] The control liquid of the hydraulic telescopic sleeve 401 can be controlled by the internal liquid, that is, the liquid in the shell 31 is sent into the inside of the hydraulic telescopic sleeve 401 through the circulating pipe 403 during the circulating filtering, so that the hydraulic telescopic function is realized, through the design, it can be ensured that the liquid is not polluted when the equipment fails to leak, and sampling can be performed, if the control liquid is externally controlled, the liquid cannot be used as the control liquid for operation, but the control liquid needs to be limited to pure water. In addition, the two circulating pipes 403 are jointly connected with a double-path sleeve 405, the double-path sleeve 405 extends to the inside of the shell 31, through the arrangement, the opening of the shell 31 can be reduced.

[0046] In one embodiment, the control mechanism 4 comprises an electromagnetic telescopic sleeve 406, which is fixedly installed above the shell 31.

[0047] Different from the above scheme, the telescopic function of the electromagnetic telescopic sleeve 406 is controlled by electromagnetic performance, while the telescopic ability of the structure is ensured, there is no risk of leakage pollution.

[0048] In one embodiment, please refer to Figures 1 to 7Specifically, the shell 31 is divided into a fixed part 312 at the upper end and a replacement part 313 at the lower end, the control mechanism 4 and the return pipe 303 are connected with the fixed part 312, the fixed part 312 is not disassembled, the top end of the replacement part 313 is connected with the fixed part 312 through flanges, the bottom end of the replacement part 313 is connected with the blowdown tee 5 through a double-end threaded sleeve 314, the inside of the replacement part 313 is provided with a filter ring 315 connected with the discharge pipe 311, the filter membrane 32 is arranged inside the filter ring 315, the top end of the filter membrane 32 is clamped with the inwardly protruding part of the top end of the replacement part 313, and the top end of the replacement part 313 is threadedly connected with an extrusion ring 316, the middle part of the lowermost extrusion ring 316 is rotatably connected with a support frame 317 with holes, the connecting rod 33 is slidably connected with the support frame 317, and the free end of the control mechanism 4 is fixedly installed with a connecting frame 318. The sealing plug 322 is fixedly connected with the connecting frame 318.

[0049] When replacing, first, the filter membrane 32 is placed inside the replacement part 313 and connected with the flanges at the bottom end through the extrusion ring 316 at the bottom end, then the connecting rod 33 is rotated to enable the connecting rod 33 to be threadedly connected with the sealing plug 322, and the support frame 317 is aligned and connected, and then the corresponding extrusion ring 316 is rotated to fix the support frame 317, the connecting rod 33 is limited from shaking from below by the support frame 317, and after completion, the double-end threaded sleeve 314 is rotated to complete the sealing connection.

[0050] In use, the raw water tank 1 needs to be filtered by the material liquid, which is pumped out by the water supply pump 2 and pumped into the inside of the filter unit 3, filtered by the filter membrane 32, and the large particles are filtered by the filter membrane 32 and returned to the raw water tank 1 again, because the sealing plug 322 can be controlled to move up and down by the control mechanism 4, the control function of the opening size between the through holes 321 is realized, when the opening is reduced and / or the power in the water supply pump 2 is increased, the pressure of the material liquid accumulated in the filter membrane 32 is increased, so that the filtering efficiency is increased, and vice versa, when the opening is increased and / or the power in the water supply pump 2 is reduced, the pressure in the filter membrane 32 is reduced, so that the large particles pressed by the pressure and attached to the surface of the filter unit 3 are no longer attached to the surface of the filter unit 3, and in this process, because the flow guide sleeve 331 always moves up and down inside, the particles inside will not be attached to the inner wall of the filter membrane 32, but will flow back with the material liquid after filtering, and by intermittently controlling the size of the gap and synchronously matching the change of the power of the water supply pump 2, the large particles can be prevented from blocking the filter membrane 32 while ensuring high-speed filtering.

[0051] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them.

Claims

1. A separation and filtration device for preparing veterinary drugs, characterized in that: include: A raw water tank (1); a water supply pump (2) provided at an output end of the raw water tank (1); A filter unit (3) is provided at the output end of the water supply pump (2), the filter unit (3) comprising an outer shell (31) and an inner filter membrane (32), the output end of the shell (31) being connected to a return pipe (303), the other end of the return pipe (303) being connected to the interior of the raw water tank (1), and one end of the shell (31) being connected to a discharge pipe (311) for discharging filtrate filtered by the filter membrane (32); The filter membrane (32) is provided with a through hole (321) for accommodating the passage of the liquid to be filtered, and a sealing plug (322) is provided above the housing (31) perpendicular to the through hole (321) to prevent the passage of the liquid. A control mechanism (4) for driving the sealing plug (322) to rise and fall, wherein the control mechanism (4) drives the sealing plug (322) to rise and fall to control the pressure in the filter membrane (32).

2. A separation and filtration device for preparing veterinary drugs according to claim 1, characterized in that: A boss-shaped outlet (323) is provided at one end of the through hole (321) that contacts the sealing plug (322), and the sealing plug (322) is shaped like a boss.

3. A separation and filtration device for preparing veterinary drugs according to claim 2, characterized in that: A connecting rod (33) is provided at the bottom end of the sealing plug (322). The connecting rod (33) is sleeved inside the through hole (321). A guide sleeve (331) is fixedly mounted on the outer surface of the connecting rod (33). The outer ring of the guide sleeve (331) does not contact the inner wall of the through hole (321). The guide sleeve (331) is in a conical cylindrical shape. The slurry flows in from the large hole end of the guide sleeve (331) and flows out from the small hole end.

4. A separation and filtration device for preparing veterinary drugs according to claim 3, characterized in that: A cavity (332) is provided at the edge of the guide sleeve (331), and the cavity (332) moves up and down to stir the liquid and flush the filter membrane (32).

5. The separation and filtration device for preparing veterinary drugs according to claim 1, characterized in that: A sewage discharge tee (5) is provided between the water supply pump (2) and the housing (31), and the sewage discharge tee (5) is connected to an alternately operating control valve (6) at its end connected to the water supply pump (2) and at its end away from the housing (31); A backwash tee (7) is provided at one end of the discharge pipe (311) away from the housing (31), and two ends of the backwash tee (7) away from the housing (31) are connected to and penetrated by alternately working control valves 2 (8), one of which is connected to the backwash mechanism.

6. A separation and filtration device for preparing veterinary drugs according to claim 5, characterized in that: The return pipe (303) is connected to a return tee (9), and both outlets of the return tee (9) are provided with a solenoid valve (10) for controlling the opening and closing size, and one of the solenoid valves (10) is connected to and passes through a branch pipe (11). The water inlet end of the water supply pump (2) is provided with a water inlet tee (12), and both inlets of the water inlet tee (12) are connected to a solenoid valve (13) for controlling the opening and closing size, and one of the solenoid valves (13) is connected to and passes through the branch pipe (11).

7. The separation and filtration device for preparing veterinary drugs according to claim 5, characterized in that: The control mechanism (4) comprises an electromagnetic telescopic sleeve (406), which is fixedly mounted above the housing (31).

8. The separation and filtration device for preparing veterinary drugs according to claim 5, characterized in that: The control mechanism (4) comprises a hydraulic telescopic sleeve (401) mounted on the top of the housing (31); a control end of the hydraulic telescopic sleeve (401) is arranged outside the housing (31); a liquid inlet end and a liquid outlet end of the hydraulic telescopic sleeve (401) are both connected to and penetrated by a metering pump (402); an end of the metering pump (402) away from the hydraulic telescopic sleeve (401) is connected to and penetrated by a circulation pipe (403); the circulation pipe (403) extends into the interior of the housing (31); an outlet end of the metering pump (402) connected to the liquid inlet side of the hydraulic telescopic sleeve (401) is connected to and penetrated by a sampling tee (404); and a sealing unit is provided at one end of the sampling tee (404) away from the metering pump (402) and the circulation pipe (403).

9. The separation and filtration device for preparing veterinary drugs according to claim 8, characterized in that: The two circulation pipes (403) are commonly connected to a double-circuit sleeve (405), and the double-circuit sleeve (405) extends to the interior of the housing (31).

10. A separation and filtration device for preparing veterinary drugs according to any one of claims 1 to 9, characterized in that: The housing (31) is divided into a fixed portion (312) at the upper end and a replacement portion (313) at the lower end, and the control mechanism (4) and the return pipe (303) are both connected to the fixed portion (312); The top end of the replacement part (313) is flange-connected to the fixed part (312), the bottom end of the replacement part (313) is threadedly connected to the sewage tee (5) via a double-threaded sleeve (314), a filter ring (315) connected to the discharge pipe (311) is provided inside the replacement part (313), the filter membrane (32) is provided inside the filter ring (315), the top end of the filter membrane (32) is engaged with the inwardly protruding portion of the top end of the replacement part (313), the top end of the replacement part (313) is threadedly connected to an extrusion ring (316), the middle part of the lowest extrusion ring (316) is rotatably connected to a support frame (317) with a hole, and the connecting rod (33) is slidably connected to the support frame (317); A connecting frame (318) is fixedly mounted on the free end of the control mechanism (4), and the sealing plug (322) is fixedly connected to the connecting frame (318).

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