CN113769431B - Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator - Google Patents
Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator Download PDFInfo
- Publication number
- CN113769431B CN113769431B CN202111102360.9A CN202111102360A CN113769431B CN 113769431 B CN113769431 B CN 113769431B CN 202111102360 A CN202111102360 A CN 202111102360A CN 113769431 B CN113769431 B CN 113769431B
- Authority
- CN
- China
- Prior art keywords
- rod
- push
- pull
- knocking
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0063—Control or regulation
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/06—Audible signalling systems; Audible personal calling systems using hydraulic transmission; using pneumatic transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a crystallization kettle provided with a pneumatic alarm and used for producing p-hydroxybenzoic acid, which comprises a kettle body and the pneumatic alarm, wherein the pneumatic alarm comprises a rotating shaft, a gong, a first sliding sleeve, a second sliding sleeve, a knocking rod for knocking the gong, a knocking spring for driving the knocking rod to knock the gong and a push-pull rod penetrating in the second sliding sleeve, the push-pull rod is driven by the rotating shaft to perform reciprocating translational motion, the rotating shaft is driven by air flow to rotate, the knocking rod penetrates in the first sliding sleeve, one end of the knocking rod, far away from the gong, is provided with a sliding block matched with the first sliding sleeve, a hook head which is hooked on the first sliding sleeve and matched with the pull rod is formed between the sliding block and the knocking rod, the sliding block is connected with a reset rod parallel to the knocking rod, and the push-pull rod is provided with an extrusion block. The invention provides a mechanical crystallization kettle with a pneumatic alarm for producing p-hydroxybenzoic acid, which is used for replacing an electronic alarm on the crystallization kettle for producing p-hydroxybenzoic acid and solves the problem of electronic easy damage.
Description
Technical Field
The invention relates to the technical field of production of p-hydroxybenzoic acid, in particular to a crystallization kettle provided with a pneumatic alarm and used for producing p-hydroxybenzoic acid.
Background
Para-hydroxybenzoic acid (PHBA) is an important organic synthetic raw material, becomes one of the most widely used materials in organic chemical raw materials due to the unique hydroxyl and carboxyl functional groups, and is widely applied in the fields of medicine, pesticide, food, electronic communication, high polymer material industry and the like [1,2] . In recent years, PHBA is in great demand in domestic and foreign markets. Since the beginning of the 20 th century and the 80 th era, china develops and produces PHBA, and the productivity is increased year by year [3] . However, compared with foreign technologies, our country PHBA production process is relatively lagged behind, the operation is complex, the yield is low, the energy consumption is high and the wastewater production is large. In addition, with the continuous development of society, the demand of related downstream industries on high-purity, low-chroma and high-stability PHBA is increasing.
P-hydroxybenzoic acid is mainly used for synthesizing Liquid Crystal Polymer (LCP) at present, liquid Crystal Polymer (LCP) is a polymer that can exist in a liquid crystal phase under certain conditions, has the characteristics of both polymer materials and liquid crystal materials, has the characteristics of excellent mechanical properties, low hygroscopicity, chemical corrosion resistance, weather resistance, heat resistance, flame retardancy, low dielectric constant, dielectric loss factor and the like, and is widely applied to the fields of 5G, aerospace, electronics, automobile industry and the like. Currently, the global LCP capacity is about 7.6 ten thousand tons/year, the occupation ratio of Japan and United states is 45% and 34%, and the major manufacturers include Japan treasures, sumitomo, xinri stone, and American Serratia, solvay, etc. China relies on import in the United states for a long time. In recent years, china manufacturers began to put LCP into production successively by Jinfa technology, pulex, wolter shares, poly-Jia new materials, and the like. Need use the crystallization kettle to crystallize in the p hydroxybenzoic acid production process, the crystallization kettle in-process need warn, current warning is going on through electronic horn, and electronic horn is electrical equipment, uses to produce electrical apparatus easily and damages and inefficacy in p hydroxybenzoic acid crystallization place.
Disclosure of Invention
The invention provides a mechanical crystallization kettle with a pneumatic alarm for producing p-hydroxybenzoic acid, which is used for replacing an electronic alarm on the crystallization kettle for producing p-hydroxybenzoic acid and solves the problem of electronic easy damage.
The technical problem is solved by the following technical scheme: a crystallization kettle provided with a pneumatic warning device and used for producing p-hydroxybenzoic acid comprises a kettle body and is characterized in that the kettle body is provided with the pneumatic warning device, the pneumatic warning device comprises a rotating shaft, a gong, a first sliding sleeve, a second sliding sleeve, a knocking rod for knocking the gong, a knocking spring for driving the knocking rod to knock the gong and a push-pull rod penetrating in the second sliding sleeve, the push-pull rod is driven by the rotating shaft to perform reciprocating translational motion, the knocking rod penetrates in the first sliding sleeve, one end of the knocking rod, far away from the gong, is provided with a sliding block matched with the first sliding sleeve, a hook head which is hooked on one side, far away from the gong, of the first sliding sleeve and is matched with the pull rod is formed between the sliding block and the knocking rod, and the hook head is positioned on one side, far away from the push-pull rod, of the knocking rod, the slider is connected with the release link that is parallel with the knocking rod, and the push-and-pull rod is equipped with the extrusion the release link makes the slider move down the slider and be less than the extrusion piece of first sliding sleeve towards the one end of first sliding sleeve, the extrusion piece is equipped with presses the direction inclined plane that the release link made the push-and-pull rod move down when moving towards the direction of keeping away from the slider, form between release link and the slider and hold when the slider inserts in first sliding sleeve the groove of dodging of extrusion piece, be connected with in the pivot and distribute the actuating lever of radial extension along pivot circumference, the one end that the pivot was kept away from to the actuating lever is equipped with the gas outlet, and the opening direction perpendicular to pivot of gas outlet is equipped with pivot portion air current passageway in the pivot, be equipped with the intercommunication in the actuating lever gas outlet and pivot portion air current passageway's actuating lever portion air current passageway. During the use, make the air current (like compressed air) input pivot portion air current passageway, then the air current flows from the steam outlet behind the drive rod portion air current passageway, steam produces the back thrust when flowing from the steam outlet and makes the actuating lever rotate, drive push-and-pull rod comes and goes to remove when the pivot rotates, drive slider loses the hookup on first guide ring when push-and-pull rod moves towards the slider, then strike the pole and move towards the gong and realize striking the gong under the effect of striking the spring, when the push-and-pull rod moves towards keeping away from the slider direction, thereby it resets and enough arrives on the first sliding sleeve to extrude the upper end slider of release link through the extrusion piece, thereby the realization that so circulation strikes the drive pivot rotation and realizes the sound production and warns when having steam output to the continuous drive pole of gong. The driving mode drives the torque of the rotating shaft to drive when the air pressure is low.
The invention also comprises a fixed seat, a prismatic fixed seat part guide sliding rod with one end connected with the fixed seat and parallel to the knocking rod, and a support sliding plate sleeved on the fixed seat part guide sliding rod, wherein one end of the knocking spring is connected with the top seat, the other end of the knocking spring is connected with the support sliding plate, and the sliding block is supported on the support sliding plate in a sliding manner. The impact on the knocking effect caused by bending of the knocking spring due to movement of the sliding block can be prevented.
The invention also comprises a slide block return spring for driving the slide block to move towards the push-pull rod, a fixed plate fixedly connected on the guide sleeve, a prismatic fixed plate part guide slide rod which is arranged on the fixed plate in a penetrating way and is vertical to the knocking rod, and a pressing slide plate fixedly connected at one end of the fixed plate part guide slide rod, wherein one end of the slide block return spring is connected with the fixed plate, and the other end of the slide block return spring is connected with the pressing plate. The bending of the slide block return spring caused by the movement of the knocking rod can be avoided. The reset reliability is improved.
The invention also comprises a connecting rod, wherein one end of the connecting rod is hinged with the push-pull rod, and the other end of the connecting rod is eccentrically hinged on one end of the rotating shaft. Provides a technical proposal that the rotating shaft drives the push-pull rod.
Preferably, a push-pull plate is arranged at one end, away from the knocking rod, of the push-pull rod, the push-pull plate is parallel to the rotating shaft and perpendicular to the push-pull rod, two ends, in the axial direction of the rotating shaft, of the side surface, facing the rotating shaft, of the push-pull plate are respectively provided with a direct connection groove, the direct connection grooves, the rotating shaft and the impact rod are perpendicular in pairs, the driving rod is provided with push-pull heads which are correspondingly arranged in the direct connection grooves in a penetrating mode, one end of each direct connection groove is provided with an arc-shaped push-pull head inserting hole, the other end of each direct connection groove is provided with an arc-shaped push-pull head pulling hole, and the push-pull head inlet and the push-pull head pulling hole are located on the same circle with the rotating shaft as the center; and when the push-pull head of one driving rod is positioned in the hook head inlet, the push-pull head of the other driving rod is positioned in the push-pull head outlet. Another technical scheme that the generator drives the push-pull rod in a rotating mode is provided.
Preferably, the push-pull head is sleeved with a support bearing, and the driving rod is in contact with the push-pull plate only through the bearing on the push-pull head. The resistance during the action is small.
The invention has the following advantages: the heat can be recycled; can sound production warn to the personnel know equipment and work at high temperature, the security when having improved the use.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the push-pull rod just moved to disengage the slide;
FIG. 4 is a schematic view of the gong being struck by the striking rod;
FIG. 5 is a schematic view of the push-pull rod just driving the slider to move down to push the sliding sleeve out completely;
fig. 6 is a partial schematic view of a second embodiment of the invention.
In the figure: the device comprises a kettle body 1, a rotating shaft 9, a driving rod 10, an air outlet 11, a rotating shaft part air flow channel 12, a driving rod part air flow channel 13, a steam outlet 14, a vertical rod 15, a blind hole 16, a vertical rod air flow channel 17, a gong 18, a first sliding sleeve 19, a second sliding sleeve 20, a knocking rod 21, a knocking spring 22, a push-pull rod 23, a sliding block 25, a reset rod 26, an extrusion block 27, a guide inclined plane 28, an avoidance groove 29, a fixed seat 30, a fixed seat part guide sliding rod 32, a supporting sliding plate 33, a sliding block reset spring 34, a fixed plate 35, a fixed plate part guide sliding rod 36, a pressing sliding plate 37, a connecting rod 38, a push-pull plate 39, a direct connection groove 40, a push-pull head 41, a push-pull head insertion opening 42 and a push-pull head extraction opening 43.
Detailed Description
The invention is further described with reference to the following figures and examples.
First embodiment, referring to fig. 1 to 5, a crystallization kettle for producing p-hydroxybenzoic acid with pneumatic alarm comprises a kettle body 1 and a pneumatic alarm. The pneumatic alarm comprises a rotating shaft 9, and a plurality of driving rods 10 which radially extend along the circumferential direction of the rotating shaft are connected to the rotating shaft. An air outlet 11 is formed in one end, away from the rotating shaft, of the driving rod, the opening direction of the air outlet is perpendicular to the rotating shaft, a rotating shaft part air flow channel 12 is formed in the rotating shaft, and a driving rod part air flow channel 13 communicated with the air outlet and the rotating shaft part air flow channel is formed in the driving rod. The pneumatic warning device further comprises a gong 18, a first sliding sleeve 19, a second sliding sleeve 20, a knocking rod 21 for knocking the gong, a knocking spring 22 for driving the knocking rod to knock the gong and a push-pull rod 23 arranged in the second sliding sleeve in a penetrating mode, the push-pull rod is driven by a rotating shaft to perform reciprocating translational motion, the knocking rod is arranged in the first sliding sleeve in a penetrating mode, one end, far away from the gong, of the knocking rod is provided with a sliding block 25 matched with the first sliding sleeve, a hook head which is hooked on one side, far away from the gong, of the first sliding sleeve and matched with a pull rod is formed between the sliding block and the knocking rod, the hook head is located on one side, far away from the push-pull rod, of the knocking rod is connected with a reset rod 26 parallel to the knocking rod, the push-pull rod is provided with a pressing block 27 which can extrude the resetting rod to enable the sliding block to move downwards to be lower than the sliding block towards one end, far away from the first sliding sleeve, the pressing block is provided with a guide inclined plane 28 which can drive the resetting rod to move downwards when the pushing rod moves towards the direction far away from the sliding block, and an avoiding groove 29 which can be formed between the resetting rod and the sliding block when the sliding block is inserted into the first sliding sleeve. The invention also comprises a fixed seat 30, a prismatic fixed seat part guide slide rod 32 with one end connected with the fixed seat and parallel to the knocking rod, and a support slide plate 33 sleeved on the fixed seat part guide slide rod, wherein one end of the knocking spring is connected with the top seat, the other end of the knocking spring is connected with the support slide plate, and the slide block is supported on the support slide plate in a sliding way. The invention also comprises a slide block return spring 34 for driving the slide block to move towards the push-pull rod, a fixed plate 35 fixedly connected on the guide sleeve, a prismatic fixed plate part guide slide rod 36 which is arranged on the fixed plate in a penetrating way and is vertical to the knocking rod, and a pressing slide plate 37 fixedly connected at one end of the fixed plate part guide slide rod, wherein one end of the slide block return spring is connected with the fixed plate, and the other end of the slide block return spring is connected with the pressing plate. The invention also comprises a connecting rod 38, one end of which is hinged with the push-pull rod and the other end is eccentrically hinged with one end of the rotating shaft. When the air-flow-type air compressor is used, compressed air is input into the air flow channel of the rotating shaft part, and then air flows out from the air outlet, so that the rotating shaft is rotated.
The second embodiment is different from the first embodiment in that:
referring to fig. 6, a push-pull plate 39 is disposed at an end of the push-pull rod away from the knocking rod, and the driving rods are uniformly distributed along the circumferential direction of the rotating shaft. The push-pull plate is parallel to the rotating shaft and is perpendicular to the push-pull rod, two ends, along the axial direction of the rotating shaft, of the side surface, facing the rotating shaft, of the push-pull plate are respectively provided with a straight connecting groove 40, the straight connecting grooves, the rotating shaft and the impact rod are perpendicular to one another, the driving rod is provided with push-pull heads 41 which are arranged in the straight connecting grooves in a one-to-one corresponding mode, one end of each straight connecting groove is provided with an arc-shaped push-pull head inserting hole 42, the other end of each straight connecting groove is provided with an arc-shaped push-pull head pulling outlet 43, and the push-pull head inlet and the push-pull head pulling outlet are located on the same circle with the rotating shaft as the center; and when the push-pull head of one driving rod is positioned in the hook head inlet, the push-pull head of the other driving rod is positioned in the push-pull head outlet. The push-pull head is sleeved with a support bearing, and the drive rod is only contacted with the push-pull plate through the bearing on the push-pull head.
Claims (5)
1. A crystallization kettle provided with a pneumatic warning device and used for producing p-hydroxybenzoic acid comprises a kettle body and is characterized in that the kettle body is provided with the pneumatic warning device, the pneumatic warning device comprises a rotating shaft, a gong, a first sliding sleeve, a second sliding sleeve, a knocking rod for knocking the gong, a knocking spring for driving the knocking rod to knock the gong and a push-pull rod penetrating in the second sliding sleeve, the push-pull rod is driven by the rotating shaft to perform reciprocating translational motion, the knocking rod penetrates in the first sliding sleeve, one end of the knocking rod, far away from the gong, is provided with a sliding block matched with the first sliding sleeve, a hook head which is hooked on one side, far away from the gong, of the first sliding sleeve and is matched with the pull rod is formed between the sliding block and the knocking rod, and the hook head is positioned on one side, far away from the push-pull rod, of the knocking rod, the sliding block is connected with a reset rod which is parallel to the knocking rod, the push-pull rod is provided with an extrusion block which extrudes the reset rod to enable the sliding block to move downwards to one end, facing the first sliding sleeve, of the sliding block, the extrusion block is provided with a guide inclined plane which presses the reset rod to enable the push-pull rod to move downwards when the push-pull rod moves towards the direction far away from the sliding block, an avoidance groove which contains the extrusion block when the sliding block is inserted into the first sliding sleeve is formed between the reset rod and the sliding block, the rotating shaft is connected with driving rods which extend in the radial direction along the circumferential direction of the rotating shaft, one end, far away from the rotating shaft, of each driving rod is provided with an air outlet, the opening direction of the air outlet is perpendicular to the rotating shaft, a rotating shaft air flow channel is arranged in the rotating shaft, and a driving rod air flow channel which is communicated with the air outlet and the rotating shaft air flow channel is arranged in the driving rods; the crystallization kettle for producing the p-hydroxybenzoic acid with the pneumatic warning indicator further comprises a slider reset spring for driving the slider to move towards the push-pull rod, a fixed plate fixedly connected to the guide sleeve, a prismatic fixed plate part guide slide rod perpendicular to the knocking rod and a pressing slide plate fixedly connected to one end of the fixed plate part guide slide rod, wherein the fixed plate is arranged on the fixed plate in a penetrating mode, one end of the slider reset spring is connected with the fixed plate, and the other end of the slider reset spring is connected with the pressing slide plate.
2. The crystallization kettle for producing p-hydroxybenzoic acid with the pneumatic warning indicator according to claim 1, further comprising a fixed base, a prismatic fixed base guide slide rod with one end connected to the fixed base and parallel to the knocking rod, and a support slide plate sleeved on the fixed base guide slide rod, wherein one end of the knocking spring is connected to the fixed base, the other end of the knocking spring is connected to the support slide plate, and the slide block is slidably supported on the support slide plate.
3. The crystallization kettle provided with the pneumatic warning indicator and used for producing the p-hydroxybenzoic acid according to claim 1, further comprising a connecting rod, wherein one end of the connecting rod is hinged with the push-pull rod, and the other end of the connecting rod is eccentrically hinged to one end of the rotating shaft.
4. The crystallization kettle for producing p-hydroxybenzoic acid with the pneumatic warning device according to claim 1, wherein a push-pull plate is disposed at one end of the push-pull rod away from the knocking rod, the push-pull plate is parallel to the rotating shaft and perpendicular to the push-pull rod, two straight connecting grooves are disposed at each end of the push-pull plate facing the side surface of the rotating shaft along the axial direction of the rotating shaft, the straight connecting grooves, the rotating shaft and the push-pull rod are perpendicular to each other, the driving rod is provided with push-pull heads for being inserted into the straight connecting grooves in a one-to-one correspondence manner, one end of the straight connecting groove is provided with an arc-shaped push-pull head insertion opening, the other end of the straight connecting groove is provided with an arc-shaped push-pull head extraction opening, and the push-pull head insertion opening and the push-pull head extraction opening are located on the same circle with the rotating shaft as the center; and when the push-pull head of one driving rod is positioned in the hook head inlet, the push-pull head of the other driving rod is positioned in the push-pull head outlet.
5. The crystallization kettle for producing p-hydroxybenzoic acid with the pneumatic warning indicator according to claim 4, wherein the push-pull head is sleeved with a support bearing, and the drive rod contacts with the push-pull plate only through the bearing on the push-pull head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111102360.9A CN113769431B (en) | 2021-09-19 | 2021-09-19 | Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111102360.9A CN113769431B (en) | 2021-09-19 | 2021-09-19 | Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113769431A CN113769431A (en) | 2021-12-10 |
| CN113769431B true CN113769431B (en) | 2023-03-21 |
Family
ID=78852369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111102360.9A Active CN113769431B (en) | 2021-09-19 | 2021-09-19 | Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113769431B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011012805B4 (en) * | 2011-03-02 | 2013-06-06 | I-E-S E.K., Inhaber Dr. Oliver Jacobs | Treatment of raw brine from seawater desalination plants |
| CN106269032B (en) * | 2016-08-14 | 2018-07-10 | 余佩佩 | A kind of waste and old mosaic tiles processing unit |
| CN108338381B (en) * | 2018-01-26 | 2021-01-15 | 张家界洪杨豆制品有限责任公司 | Agricultural is with clapping soybean equipment |
| CN108672275A (en) * | 2018-03-30 | 2018-10-19 | 深圳诺智研机械研究设计有限公司 | A kind of agricultural soybean separation equipment |
| CN212933977U (en) * | 2020-08-03 | 2021-04-09 | 胡焱 | Stable form warning sign that water conservancy construction was used |
| CN214144915U (en) * | 2020-12-21 | 2021-09-07 | 河南海润德水处理科技有限公司 | Wave making device for water park |
-
2021
- 2021-09-19 CN CN202111102360.9A patent/CN113769431B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113769431A (en) | 2021-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113769431B (en) | Crystallization kettle for producing p-hydroxybenzoic acid with pneumatic warning indicator | |
| CN113484235B (en) | Device for measuring ice adhesion strength on surface of wind turbine blade | |
| CN206936151U (en) | A kind of hardware dies of rotary type | |
| CN216023261U (en) | If crystallization kettle is used in p hydroxybenzoic acid production of vocal ware | |
| CN106564885A (en) | Jet device for continuous preparation of graphene and method thereof | |
| CN101291085A (en) | Hollow tube for copper conductive wire | |
| CN201581163U (en) | Large tow carbon fiber expanding device | |
| CN113731316B (en) | Energy recovery formula reation kettle is used in p hydroxybenzoic acid production | |
| CN112225884A (en) | Method and system for continuously preparing liquid crystal polymer with adjustable molecular structure | |
| CN215140450U (en) | Grinder that nano-material production used | |
| CN101524713A (en) | Improved locking top structure | |
| CN201302417Y (en) | Reaming structure used at the joint of heat exchange tube plates and heat exchange tubes for slurry outside circulation | |
| CN214250113U (en) | Central air conditioning mounting structure | |
| WANG et al. | Effect of calcination temperature on the transfer hydrogenation liquefaction of cellulose over Cu/Mg/Al catalysts | |
| CN201985714U (en) | Flaring device for armature slot insulating paper of automobile starter | |
| CN112337975A (en) | Seamless steel pipe piercing plug | |
| CN101332742A (en) | Tubeless rim joint mounting method and guide structure thereof | |
| CN207964120U (en) | A kind of cable shaft temperature-detecting device | |
| CN218025855U (en) | PTFE glass fiber chopping machine | |
| CN205960906U (en) | Mechanism of fast whole pile of thickness of speed adjusting | |
| CN207779213U (en) | The molding machine of circular heat exchanger | |
| CN218297302U (en) | Novel level meter | |
| CN200962009Y (en) | Composite tooth type internal thread copper pipe | |
| CN204866953U (en) | A beat device for just manage bender | |
| CN105834314A (en) | Head-expander tube expanding mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |