CN213942221U

CN213942221U - Metronidazole production filter press

Info

Publication number: CN213942221U
Application number: CN202022965119.6U
Authority: CN
Inventors: 程绍春
Original assignee: Donggang Hongda Pharmaceutical Co ltd
Current assignee: Donggang Hongda Pharmaceutical Co ltd
Priority date: 2020-12-12
Filing date: 2020-12-12
Publication date: 2021-08-13
Anticipated expiration: 2030-12-12

Abstract

The utility model discloses a metronidazole production pressure filter, including main part, filter equipment, business turn over material device, circulation device and induction system, filter equipment passes through the filter plate and is connected with the main part, and business turn over material device passes through the inlet pipe and is connected with the main part, and induction system passes through the air pressure monitor and is connected with business turn over material device, and circulation device passes through the blowdown pipe and is connected with the main part. The utility model discloses the cylindricality filter rod is vertical to be installed on the filter plate, it is fixed with the filter plate through sealed pad and nut, the cylindricality filter rod is used for filtering, its structure is even, the aperture distributes narrowly, separation efficiency is high, the porosity is high, the filtration resistance is little, the infiltration efficiency is high, high temperature resistant, generally can be in the below normal use of wet 280 degrees, chemical stability is good, acid and alkali corrosion resistance, the oxidation resistance has, metronidazole solution filters the back precision higher, the liquid outlet is used for deriving the filterable liquid medicine of completion from the cylindricality filter rod, the filter plate is installed at filter-pressing jar body middle part as filter medium, open the mounting hole in surface is used for installing the cylindricality filter rod.

Description

Metronidazole production filter press

Technical Field

The utility model relates to a pressure filter, specifically a metronidazole production pressure filter.

Background

In the chemical industry pharmacy in-process, often need the primary processing to draw the pharmacodynamic ingredient of medicinal material raw materials, two the most commonly used medicine extraction element is exactly the filter-pressing jar, the filter-pressing jar is the main filtration equipment that uses when metronidazole solution filters, the filter-pressing jar comprises the feed inlet on filter-pressing jar upper portion usually, the air inlet, the water inlet, these several parts of outlet, filter-pressing jar mid-mounting filter filters, the filter-pressing jar lower part comprises discharge gate, discharge valve, the filter plate is with industry filter cloth as filter media, the filtrating that obtains through the filter cloth with the metronidazole solution of residue through gas pressure is discharged from the discharge gate of filter-pressing jar lower part.

The filter cloth used by the existing filter is woven by natural fibers and synthetic fibers, is more used for solid-liquid separation and industrial dust removal, and has the problems of low filtering precision and no high temperature resistance and acid-base resistance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a metronidazole production pressure filter to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a metronidazole production filter press comprises a main body, a filtering device, a feeding and discharging device, a circulating device and an induction device, wherein the main body comprises a base, a support, an annular clamping frame, a connecting support column and a filter pressing tank, a plurality of surfaces of the support are respectively connected with one surface of the base, a plurality of surfaces of the annular clamping frame are respectively connected with one surface of a plurality of supports, the peripheral side surfaces of the connecting support column are respectively connected with one surface of the annular clamping frame, one surface of the filter pressing tank is respectively connected with one surface of the connecting support column, the filtering device comprises a filter plate, a filter rod mounting hole and a cylindrical filter rod, the filter pressing tank is of a hollow structure, the peripheral side surfaces of the filter plate are connected with the inner surface of the filter pressing tank, one surface of the filter rod mounting hole is respectively connected with one surface of the filter rod mounting hole, and the peripheral side surfaces of the cylindrical filter rod are respectively connected with one surface of the filter rod mounting hole, the device of input and output includes inlet pipe, water injection pipe and intake pipe, an inlet pipe surface is connected with a filter-pressing jar surface, a water injection pipe surface is connected with a filter-pressing jar surface, an intake pipe surface and a filter-pressing jar surface connection, the circulation device includes blowdown pipe, blowoff valve, control nut and exhaust duct, blowdown pipe surface and filter-pressing jar surface connection, blowdown valve surface and blowdown pipe week side connection, control nut surface and blowdown pipe surface connection, exhaust duct surface and filter-pressing jar surface connection, induction system includes the atmospheric pressure monitor, atmospheric pressure monitor surface and intake pipe week side connection.

Preferably, the main body further comprises an arc-shaped plate, two-lug clamping plates, conical columns and retaining rings, one surface of the arc-shaped plate is connected with the peripheral side face of the filter-pressing tank, one surface of each of the two-lug clamping plates is connected with one surface of the arc-shaped plate, one surface of each of the conical columns is connected with one surface of each of the two-lug clamping plates, one surface of each of the retaining rings is connected with one surface of each of the conical columns, two total brackets are used for fixedly mounting the filter-pressing tank, two total annular clamping frames are used for fixedly mounting connecting supporting columns, two total connecting supporting columns are used for fixedly mounting the filter-pressing tank, sixteen total number of the two-lug clamping plates are used for fixing the conical columns, sixteen total number of the conical columns are used for mounting the retaining rings, sixteen total number of the retaining rings are used for hanging things on the outer wall of the filter-pressing tank, and the base is the base of the whole device, the filter-pressing jar is used for carrying out the filter-pressing, and the arc is tied the board and is used for installing the awl post.

Preferably, the filtering device also comprises a filtering layer and liquid outlets, wherein one surface of the filtering layer is respectively connected with one surface of the plurality of cylindrical filter sticks, one surface of the plurality of liquid outlets is respectively connected with one surface of the cylindrical filter sticks, thirty five filter stick mounting holes are formed in the filter sticks and used for mounting the cylindrical filter sticks on the filter plate, the cylindrical filter sticks are vertically mounted on the filter plate and fixed with the filter plate through sealing gaskets and nuts, thirty five cylindrical filter sticks are formed in the cylindrical filter sticks and used for filtering, the filtering device is uniform in structure, narrow in pore size distribution, high in separation efficiency, high in porosity, small in filtering resistance, high in permeation efficiency, high-temperature resistant, capable of being normally used under 280 ℃ in a wet state generally, good in chemical stability, acid and alkali corrosion resistant, and oxidation resistant, high in accuracy after metronidazole solution filtering, thirty five filtering layers are formed in the filtering layer and used for filtering, thirty-five liquid outlets are formed, the liquid outlets are used for guiding out the filtered liquid medicine from the cylindrical filter sticks, the filter plate is used as a filter medium and is arranged in the middle of the tank body of the filter-pressing tank, and mounting holes are formed in the surface of the filter plate and used for mounting the cylindrical filter sticks.

Preferably, the feeding and discharging device further comprises a discharging pipe, one surface of the discharging pipe is connected with one surface of the filter-pressing tank, the feeding pipe injects the filtrate into the filter-pressing tank under the action of compressed air, the water injection pipe injects water into the filter-pressing tank for cleaning residues on the surface of the cylindrical filter stick after filter pressing, the air inlet pipe injects steam into a jacket of the filter-pressing tank to preserve heat of the filtrate and prevent condensation crystallization, and the discharging pipe discharges the filtered liquid medicine.

Preferably, the circulation device further comprises an exhaust valve, one surface of the exhaust valve is connected with one surface of the discharge pipe, the sewage discharge guide pipe is used for discharging sewage after the filter rod is cleaned, after the filter rod is filtered, the water injection pipe enters the water to clean the cylindrical filter rod in the tank body, finally, the sewage is discharged from the sewage discharge valve at the front end of the tank body, the control nut is used for controlling the on-off of the sewage discharge valve, the exhaust guide pipe is used for exhausting, the exhaust valve can exhaust gas in the filter-pressing tank, the exhaust valve at the lower part of the tank body is started firstly during the filtering, and the exhaust valve is closed when liquid is discharged.

Preferably, the induction system further comprises a temperature sensor, one surface of the temperature sensor is connected with the peripheral side of the filter-pressing tank, wherein the air pressure monitor can monitor the air pressure of the air inlet pipe, so that the air pressure in the filter-pressing tank is controlled to be kept in a proper condition, and the temperature sensor is used for sensing the temperature in the filter-pressing tank, so that control is performed, and filtrate is prevented from being condensed and crystallized.

Compared with the prior art, the beneficial effects of the utility model are that:

the filter device comprises a support, an annular clamping frame, a base, a double-lug clamping plate, a conical column, a retaining ring, a base, a filtering tank, an arc-shaped plate, a filter stick mounting hole, a cylindrical filter stick, a filter stick vertical to the filter board and fixed with the filter board through a sealing pad and a nut, wherein the support is used for fixedly mounting a filter tank, the annular clamping frame is used for mounting and fixing a connecting support, the connecting support is used for mounting and fixing the filter tank, the double-lug clamping plate is used for fixing a conical column, the conical column is used for mounting and fixing a retaining ring on the outer wall of the filter tank, the base is a base body of the whole device, the filter tank is used for carrying out filter pressing, the arc-shaped plate is used for mounting the conical column, the filter stick mounting hole is used for mounting a cylindrical filter stick on the filter board, the cylindrical filter stick is vertically mounted on the filter board and fixed with the filter board through the sealing pad and the nut, the cylindrical filter stick is used for carrying out filtering, the filter stick has the advantages of uniform structure, narrow pore size distribution, high separation efficiency, high temperature resistance, good chemical stability, good acid and alkali corrosion resistance, high oxidation resistance, high temperature resistance, can be normally used for filtering under the wet state below 280 degrees, and can be used for filtering, the liquid outlet is used for leading out the liquid medicine that finishes filtering from the cylindricality filter rod, and the filter plate is installed at the filter-pressing jar body middle part as filter medium, and the surface is opened the mounting hole and is used for installing the cylindricality filter rod.

The filter comprises a filter press tank, a filter stick, a discharge pipe, a filter stick cover, a filter rod, a discharge pipe, a water inlet pipe, a control nut, a discharge pipe, a filter tube, a filter tank jacket, a filter rod inlet pipe, a discharge valve, a discharge pipe, a control nut and a discharge valve, wherein the filter rod surface residue is cleaned after filter pressing, steam is injected into the filter press tank jacket through the air inlet pipe, the filter rod is kept warm and prevented from being condensed and crystallized, the discharge pipe discharges filtered liquid medicine, the discharge pipe is used for discharging sewage, the discharge valve is used for discharging air, the discharge valve can discharge air in the filter press tank, the discharge valve is started firstly when the filter is filtered, the discharge valve is closed when liquid is discharged.

The atmospheric pressure monitor can monitor the atmospheric pressure of intake pipe to the atmospheric pressure in the control filter-pressing jar makes it keep in suitable situation, and the temperature-sensing ware is used for responding to the temperature in the filter-pressing jar, thereby controls, prevents filtrating condensation crystallization.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a metronidazole production pressure filter.

Fig. 2 is a front view of a metronidazole production press filter.

FIG. 3 is a sectional view A-A of a metronidazole production pressure filter in FIG. 2.

FIG. 4 is an enlarged view of the structure of a metronidazole production filter press shown in FIG. 1A.

In the figure: 100. a main body; 110. a base; 120. a support; 130. an annular clamp frame; 140. connecting the supporting columns; 150. a filter-pressing tank; 160. an arc-shaped tightening plate; 170. a double-lug clamping plate; 180. a conical column; 190. a retaining ring; 200. a filtration device; 210. filtering the plate; 220. a filter stick mounting hole; 230. a cylindrical filter stick; 240. a filter layer; 250. a liquid outlet; 300. a feeding and discharging device; 310. a feed pipe; 320. a water injection pipe; 330. an air inlet pipe; 340. a discharge pipe; 400. a flow-through device; 410. a waste pipe; 420. a blowoff valve; 430. a control nut; 440. an exhaust conduit; 450. an exhaust valve; 500. an induction device; 510. a pressure monitor; 520. a temperature sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, in an embodiment of the present invention, the filter device includes a main body 100, a filter device 200, a feeding and discharging device 300, a circulating device 400, and a sensing device 500, the main body 100 includes a base 110, supports 120, annular clamping frames 130, connecting pillars 140, and a filter pressing tank 150, a surface of each of the plurality of supports 120 is connected to a surface of the base 110, a surface of each of the plurality of annular clamping frames 130 is connected to a surface of each of the plurality of supports 120, a peripheral surface of each of the plurality of connecting pillars 140 is connected to a surface of each of the plurality of annular clamping frames 130, a surface of each of the plurality of connecting pillars 140 is connected to a surface of each of the filter pressing tank 150, the filter device 200 includes a filter plate 210, a filter rod installation hole 220, and a cylindrical filter rod 230, the filter pressing tank 150 is hollow, a peripheral surface of each of the filter plate 210 is connected to an inner surface of the filter pressing tank 150, a surface of each of the filter rod installation hole 220 is connected to a surface of the filter plate 210, a peripheral surface of each of the cylindrical filter rod 230 is connected to a surface of the filter rod installation hole 220, the feeding and discharging device 300 comprises a feeding pipe 310, a water injection pipe 320 and an air inlet pipe 330, wherein one surface of the feeding pipe 310 is connected with one surface of the filter-pressing tank 150, one surface of the water injection pipe 320 is connected with one surface of the filter-pressing tank 150, one surface of the air inlet pipe 330 is connected with one surface of the filter-pressing tank 150, the circulating device 400 comprises a sewage guide pipe 410, a sewage valve 420, a control nut 430 and an exhaust guide pipe 440, one surface of the sewage guide pipe 410 is connected with one surface of the filter-pressing tank 150, one surface of the sewage valve 420 is connected with the peripheral side of the sewage guide pipe 410, one surface of the control nut 430 is connected with one surface of the sewage guide pipe 410, one surface of the exhaust guide pipe 440 is connected with one surface of the filter-pressing tank 150, the sensing device 500 comprises an air pressure monitor 510, and one surface of the air pressure monitor 510 is connected with the peripheral side of the air inlet pipe 330.

Wherein, the main body 100 further comprises an arc-shaped tying plate 160, two-ear snapping plates 170, conical columns 180 and a retaining ring 190, one surface of the arc-shaped tying plate 160 is connected with the peripheral side surface of the filter-pressing tank 150, one surface of the two-ear snapping plates 170 is respectively connected with one surface of the arc-shaped tying plate 160, one surface of the two-ear snapping plates 180 is respectively connected with one surface of the two-ear snapping plates 170, one surface of the retaining ring 190 is respectively connected with one surface of the conical columns 180, wherein, the number of the brackets 120 is two, the brackets 120 are used for fixedly mounting the filter-pressing tank 150, the number of the annular clamping frames 130 is two, the annular clamping frames 130 are used for mounting the fixedly connecting struts 140, the number of the connecting struts 140 is two, the connecting struts 140 are used for mounting the fixed filter-pressing tank 150, the number of the two-ear snapping plates 170 is sixteen, the two-ear snapping plates 170 are used for fixing the conical columns 180, the total number of the conical columns 180 is sixteen, the conical columns 180 are used for mounting the retaining ring 190, the retaining ring 190 is sixteen, the retaining ring 190 is used for suspending things on the outer wall of the filter-pressing tank 150, the base 110 is the base of the whole device, the filter pressing tank 150 is used for filter pressing, and the arc-shaped tie plate 160 is used for installing the conical column 180.

Wherein, the filtering device 200 also includes the filter layer 240 and the liquid outlet 250, a surface of several filter layers 240 is connected with a surface of several column-shaped filter sticks 230 separately, a surface of several liquid outlets 250 is connected with a surface of column-shaped filter sticks 230 separately, wherein, thirty five filter stick mounting holes 220 are total, the filter stick mounting hole 220 is used for mounting the column-shaped filter stick 230 on the filter plate 210, the column-shaped filter stick 230 is vertically mounted on the filter plate 210, and is fixed with the filter plate 210 through the sealing gasket and the nut, thirty five column-shaped filter sticks 230 are total, the column-shaped filter stick 230 is used for filtering, the structure is uniform, the aperture distribution is narrow, the separation efficiency is high, the porosity is high, the filtration resistance is small, the infiltration efficiency is high, the high temperature is resistant, generally can be used normally under the wet state 280 degrees, the chemical stability is good, the acid and alkali corrosion resistance, the oxidation resistance is high, the metronidazole solution is filtered, the precision is high, thirty five filter layers 240 are total, the filter layer 240 is used for filtering, thirty-five liquid outlets 250 are provided, the liquid outlets 250 are used for guiding out the filtered liquid medicine from the columnar filter stick 230, the filter plate 210 is used as a filter medium and is installed in the middle of the tank body of the filter-pressing tank 150, and a mounting hole is formed in the surface of the filter plate for mounting the columnar filter stick 230.

The feeding and discharging device 300 further comprises a discharging pipe 340, one surface of the discharging pipe 340 is connected with one surface of the filter-pressing tank 150, the feeding pipe 310 injects filtrate into the filter-pressing tank 150 under the action of compressed air, a water injection pipe 320 injects water into the filter-pressing tank 150 for cleaning residues on the surface of the post-filter-pressing cylindrical filter rod 230, a steam inlet pipe 330 injects steam into a jacket of the filter-pressing tank 150 to keep the temperature of the filtrate and prevent condensation and crystallization, and the discharging pipe 340 discharges the filtered liquid medicine.

The circulation device 400 further comprises an exhaust valve 450, one surface of the exhaust valve 450 is connected with one surface of the discharge pipe 340, a blowdown guide pipe 410 is used for blowdown, a blowdown valve 420 is used for discharging sewage after the filter stick is cleaned, after the filter stick is filtered, water enters the water injection pipe 320, the cylindrical filter stick 230 in the tank body is cleaned, finally the sewage is discharged from the blowdown valve 420 at the front end of the tank body, a control nut 430 is used for controlling the on-off of the blowdown valve 420, the exhaust guide pipe 440 is used for exhausting, the exhaust valve 450 can exhaust gas in the filter-pressing tank 150, during the filtering, the exhaust valve 450 at the lower portion of the tank body is started firstly, and when liquid is discharged, the exhaust valve 450 is closed.

The sensing device 500 further comprises a temperature sensor 520, one surface of the temperature sensor 520 is connected with the peripheral side of the filter-pressing tank 150, wherein the air pressure monitor 510 can monitor the air pressure of the air inlet pipe 330, so as to control the air pressure in the filter-pressing tank 150 to keep the filter-pressing tank in a proper condition, and the temperature sensor 520 is used for sensing the temperature in the filter-pressing tank 150, so as to control and prevent the filtrate from being condensed and crystallized.

The utility model discloses a theory of operation is:

the bracket 120 is used for fixedly installing the filter-pressing tank 150, the annular clamping frame 130 is used for installing and fixing the connecting strut 140, the connecting strut 140 is used for installing and fixing the filter-pressing tank 150, the double-lug clamping plate 170 is used for fixing the cone column 180, the cone column 180 is used for installing the retaining ring 190, the retaining ring 190 is used for hanging things on the outer wall of the filter-pressing tank 150, the base 110 is a base body of the whole device, the filter-pressing tank 150 is used for carrying out filter-pressing, the arc-shaped plate 160 is used for installing the cone column 180, the filter stick installing hole 220 is used for installing the cylindrical filter stick 230 on the filter plate 210, the cylindrical filter stick 230 is vertically installed on the filter plate 210 and is fixed with the filter plate 210 through a sealing gasket and a nut, and the cylindrical filter stick 230 is used for filtering and has the advantages of uniform structure, narrow pore size distribution, high separation efficiency, high porosity, small filtering resistance, high permeation efficiency and high temperature resistance, can be normally used under the wet state below 280 degrees, and has good chemical stability and is resistant to acid and alkali corrosion, The metronidazole solution has the advantages of oxidation resistance, high precision after filtration, filtering layer 240 for filtration, liquid outlet 250 for leading out the filtered liquid medicine from the columnar filter stick 230, filter plate 210 serving as a filter medium and installed in the middle of the tank body of the filter-pressing tank 150, and installation holes for installing the columnar filter stick 230.

The filter rod cleaning method comprises the steps that a feed pipe 310 injects filter liquor into a filter-pressing tank 150 under the action of compressed air, a water injection pipe 320 injects water into the filter-pressing tank 150 and is used for cleaning residues on the surface of a cylindrical filter rod 230 after filter pressing, an air inlet pipe 330 injects steam into a jacket of the filter-pressing tank 150 to keep the temperature of the filter liquor and prevent condensation and crystallization, a discharge pipe 340 discharges filtered liquid medicine, a blow-down guide pipe 410 is used for blow-down, a blow-down valve 420 is used for discharging sewage after the filter rod is cleaned, after filtering, the water injection pipe 320 injects water to clean the cylindrical filter rod 230 in the tank body, finally the sewage is discharged from the blow-down valve 420 at the front end of the tank body, a control nut 430 is used for controlling the opening and closing of the blow-down valve 420, an exhaust guide pipe 440 is used for exhausting air, the exhaust valve 450 can exhaust air in the filter-pressing tank 150, the exhaust valve 450 at the lower part of the tank body is started firstly during filtering, and the exhaust valve 450 is closed when liquid is discharged.

The pressure monitor 510 can monitor the pressure in the inlet line 330 to control the pressure in the filter press canister 150 to maintain a suitable level, and the temperature sensor 520 can sense the temperature in the filter press canister 150 to control the temperature to prevent filtrate from condensing and crystallizing.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a metronidazole production filter-press, includes main part (100), filter equipment (200), business turn over material device (300), circulation device (400) and induction system (500), its characterized in that: the main body (100) comprises a base (110), a support (120), an annular clamping frame (130), a connecting support column (140) and a filter pressing tank (150), wherein one surface of the support (120) is respectively connected with one surface of the base (110), one surface of the annular clamping frame (130) is respectively connected with one surface of the plurality of supports (120), the peripheral side surfaces of the connecting support column (140) are respectively connected with one surface of the plurality of annular clamping frames (130), one surface of the filter pressing tank (150) is respectively connected with one surface of the plurality of connecting support columns (140), the filter device (200) comprises a filter plate (210), a filter stick mounting hole (220) and a cylindrical filter stick (230), the filter pressing tank (150) is of a hollow structure, the peripheral side surfaces of the filter plate (210) are connected with the inner surface of the filter pressing tank (150), one surface of the filter stick mounting hole (220) is respectively connected with one surface of the filter plate (210), a plurality of cylindrical filter stick (230) week side is connected with a plurality of filter stick mounting hole (220) surface respectively, feeding and discharging device (300) includes inlet pipe (310), water injection pipe (320) and intake pipe (330), a surface of inlet pipe (310) and filter-pressing jar (150) surface connection, a surface of water injection pipe (320) and filter-pressing jar (150) surface connection, an intake pipe (330) surface and filter-pressing jar (150) surface connection, circulation device (400) includes blowdown pipe (410), blowoff valve (420), control nut (430) and exhaust duct (440), a surface of blowdown pipe (410) and filter-pressing jar (150) surface connection, a surface of blowoff valve (420) and side connection of blowdown pipe (410) week side, a surface of control nut (430) and surface connection of blowdown pipe (410), the surface of the exhaust conduit (440) is connected with the surface of the filter-pressing tank (150), the sensing device (500) comprises a gas pressure monitor (510), and one surface of the gas pressure monitor (510) is connected with the peripheral side surface of the air inlet pipe (330).

2. The metronidazole production pressure filter of claim 1, wherein: the main body (100) further comprises an arc-shaped tightening plate (160), double-lug clamping plates (170), conical columns (180) and retaining rings (190), one surface of the arc-shaped tightening plate (160) is connected with the peripheral side face of the filter-pressing tank (150), one surface of each of the double-lug clamping plates (170) is connected with one surface of the arc-shaped tightening plate (160), one surface of each of the conical columns (180) is connected with one surface of each of the double-lug clamping plates (170), and one surface of each of the retaining rings (190) is connected with one surface of each of the conical columns (180).

3. The metronidazole production pressure filter of claim 1, wherein: the filtering device (200) further comprises a plurality of filtering layers (240) and liquid outlets (250), wherein one surface of each filtering layer (240) is connected with one surface of each cylindrical filter stick (230), and one surface of each liquid outlet (250) is connected with one surface of each cylindrical filter stick (230).

4. The metronidazole production pressure filter of claim 1, wherein: the feeding and discharging device (300) further comprises a discharging pipe (340), and one surface of the discharging pipe (340) is connected with one surface of the filter-pressing tank (150).

5. The metronidazole production pressure filter of claim 1, wherein: the circulation device (400) further comprises an exhaust valve (450), wherein one surface of the exhaust valve (450) is connected with one surface of the discharge pipe (340).

6. The metronidazole production pressure filter of claim 1, wherein: the sensing device (500) further comprises a temperature sensor (520), and one surface of the temperature sensor (520) is connected with the peripheral side surface of the filter-pressing tank (150).