149results about How to "Increased process safety" patented technology

The invention belongs to the field of medical chemistry, and particularly relates to a crystal form of a heterocyclic compound and a pharmaceutical composition thereof. Specifically, the invention relates to a crystal form of 4-((2R, 3S, 5R)-3-(3, 4-difluoro-2-methoxyphenyl)-5-methyl-5-(trifluoromethyl) thiacyclopentane-2-formamido) pyridine-2-formamide and a pharmaceutical composition of the crystal form of 4-((2R, 3S, 5R)-3-(3, 4-difluoro-2-methoxyphenyl)-5-methyl-5-(trifluoromethyl) thiacyclopentane-2-formamido) pyridine-2-formamide. The crystal form is good in crystallinity, excellent in chemical stability and crystal form stability, high in process safety and capable of playing a good drug effect in various animal models.

The invention discloses a weak-rigidity free-form surface monocrystalline silicon reflecting lens and a processing method thereof. The method comprises the following steps: obtaining a monocrystalline silicon block; cutting into blocks; diamond wire cutting; precisely grinding the back surface; performing slicing; the free-form surface sucker adsorbs the lens; precisely grinding the front surface into a cylindrical surface; polishing the magnetorheological elastomer; releasing the lens; the cylindrical sucker adsorbs the lens; precisely grinding and thinning the back surface; releasing the lens; cutting edges and carrying out wet etching on the back surface; and carrying out ion beam modification processing to achieve the final surface shape precision of the free-form surface. According to the X-ray reflecting lens machining method, the free-form surface weak-rigidity reflecting mirror is clamped and deformed into the cylindrical surface for machining, the whole process is ultra-precision grinding and polishing of the cylindrical surface, the machining method is simple and mature, the manufacturing cost is extremely low, dependence on an ultra-high-precision multi-axis linkage machine tool is completely eliminated, and the machining precision is greatly improved. And the machining efficiency is greatly improved, and the method is suitable for mass production of reflectors.

The utility model relates to a water-guided laser coupling device which comprises a laser source (1) and a coupling cavity (2), the laser source (1) is configured to generate laser (10) extending along a preset direction (x), and the coupling cavity (2) comprises an optical window mirror (21) arranged on a propagation path of the laser (10) for the laser (10) to pass through; the high-pressure water cavity (22) is formed in the side, away from the laser source (1), of the optical window mirror (21) in the preset direction (x), and the high-pressure water cavity (22) is configured to form a water jet (220) extending in the preset direction (x); the shielding gas generating mechanism (23) is arranged on the side, away from the laser source (1), of the high-pressure water cavity (22) in the preset direction (x) and is configured to generate layered spiral gas flow (230), the layered spiral gas flow (230) comprises first spiral gas flow (231) and second spiral gas flow (232), and the first spiral gas flow (231) is located on the radial inner side of the second spiral gas flow (232).

The invention discloses a detachable assembly type building mold, relates to the technical field of building molds, and solves the technical problems that in the concrete forming process, the side pressure on a fixed baffle in the mold can be increased, and formwork deformation and slurry leakage are likely to be caused. Comprising two fixed templates which are installed on a bottom template in a sliding mode, and a base is arranged at the bottom of the bottom template; the supporting and positioning mechanisms are mounted on the base and support the base, and the two supporting and positioning mechanisms play a role in limiting and supporting the two fixed templates; the supporting and positioning mechanism comprises a bottom rail mounted on the upper surface of the base; according to the invention, the two fixed templates can be supported, the pressure of internal concrete on the fixed templates is shared, the deformation amount is reduced, and inward thrust is applied to the fixed templates in the mounting and supporting process, so that the fastening bolts on the side surfaces can be conveniently aligned and connected to adapt to the fixed templates with different heights; and the machining safety and stability of the mold on the concrete prefabricated part are improved.

The invention discloses a polymer stationary phase carrier for DNA synthesis as well as a preparation method and application of the polymer stationary phase carrier. The polymer stationary phase carrier comprises a polymer substrate, and the surface of the polymer substrate is provided with active functional groups such as ester groups, carboxyl groups, halogen or hydroxyl groups, so that the polymer substrate can be modified; the surface of the polymer substrate is modified with a first functional group, the first functional group is covalently bonded with the polymer substrate, and the first functional group is a functional group capable of reacting with an ester group, a carboxyl group or halogen; the surface of the polymer substrate is also modified with a functional group, and the functional group is a group capable of generating a click reaction; the polymer stationary phase carrier further comprises an initiation chain coupled to the polymer substrate through the functional group; and the initiating chain is coupled with the surface of the polymer substrate with the modified functional group through the second functional group. The stationary phase carrier disclosed by the invention can be used for carrying out a biological DNA synthesis reaction, and has relatively high yield and accuracy.

The invention discloses a preparation method of a 1-(aryl sulfuryl) bicyclo [1.1. 0] butane compound, which comprises the following steps: reacting a compound 1 serving as a raw material with trisubstituted propane and an alkaline reagent in a reaction solvent in an air-isolated environment under the action of an organic catalyst and a metal catalyst at the temperature of-78 to 200 DEG C for 1 to 48 hours to obtain the 1-(aryl sulfuryl) bicyclo [1.1. 0] butane compound. And obtaining a compound 2 after complete reaction. The key raw materials in the synthesis route are cheap and easy to obtain, the reaction conditions are mild, the operation is convenient, the process safety is high, the selectivity is high, the yield is high, the product purity is high, the production cost is greatly reduced, and the production requirement of the product at the ton level or above can be fully met.

The invention relates to an oxygen-deficient nano material and a solid-phase melting zinc thermal reduction preparation method and application thereof, zinc powder is taken as a reducing agent, target metal oxide such as anatase type TiO2 and zinc powder are uniformly mixed, then mild high-temperature annealing treatment is carried out in an inert gas atmosphere, a product is washed by dilute acid / alkali, and the oxygen-deficient TiO2-x nano material is obtained. Similarly, oxygen deficient SnO2-x, ZrO2-x, and BaTiO3-x materials can be produced by such methods. Compared with the existing technologies of high-temperature hydrogen reduction, complex structure carbonization, solvothermal reduction and the like for preparing the oxygen-deficient nano material, the preparation method disclosed by the invention adopts a solid-phase molten zinc thermal reduction technology, takes environment-friendly and low-cost zinc powder as a reducing agent, and prepares the oxygen-deficient nano material by utilizing a solid-phase molten zinc thermal reduction process at a mild high temperature; the preparation method has the advantages of simple process, no special requirement on production equipment, processing universality and industrial production compatibility, successfully prepares a series of defect nanometer materials with adjustable oxygen defect concentration, and effectively prolongs the cycle life of the zinc battery by applying the defect nanometer materials to the negative electrode protection of the zinc ion battery.

The present invention discloses a method for preparing an alkaline earth metal catalyst, comprising: (1) adding an alkaline earth metal compound to a polyether polyol under an inert atmosphere, stirring for reaction; (2) lowering the temperature, dripping an inorganic oxygen-containing acid into the reaction solution, stirring for reaction, and obtaining the alkaline earth metal catalyst. The present invention also discloses a method for synthesizing a water reducer monomer polyether, comprising: (1) adding an initiator and an alkaline earth metal catalyst to a reaction vessel; (2) controlling the reaction temperature and reaction pressure, continuously adding an epoxide, and reacting until the pressure no longer decreases, and obtaining the water reducer monomer polyether. In the process of synthesizing the water reducer monomer polyether catalyzed by the alkaline earth metal catalyst of the present invention, no hydrogen is generated, no moisture is generated, the production process is safe, the product can be obtained by one-step polymerization, no neutralization treatment is required, and the content of by-product polyethylene glycol in the product can be significantly reduced, and the product has the advantages of low production cost and good product performance.

The invention provides a multi-angle clamping device for structural jade carving, and belongs to the technical field of production clamping devices.The multi-angle clamping device for structural jade carving comprises a bottom plate, a precise lifting mechanism, a steering mechanism, a fine adjustment mechanism and a clamping mechanism, the bottom plate is a rectangular steel bottom plate, and counter bores are evenly formed in the peripheral edge of the bottom plate; the base is fixedly mounted through foundation bolts; the precise lifting mechanism is fixedly arranged at the center position of the bottom plate, the steering mechanism is installed at the upper end of the precise lifting mechanism, the fine adjustment mechanism is arranged above the steering mechanism, and the clamping mechanism is installed on the fine adjustment mechanism. The precise lifting mechanism comprises a lifting seat, a precise sliding rail pair, a ball screw pair and a hand wheel assembly, the lifting seat is of a square hollow structure, the lower end of the lifting seat is fixedly connected with the bottom plate, and sliding rails of the precise sliding rail pair are vertically fixed to the front side and the rear side of the inner wall of the lifting seat; the problem of low efficiency in jade processing can be solved.

The invention relates to a double-machining-channel machine tool control method and system, a storage medium and a terminal, and relates to the technical field of machine tools, and the method comprises the steps that actual operation parameters and actual machine tool parameters of a double-machining-channel machine tool are obtained; inputting the actual machine tool parameters into a preset virtual computer numerical control module to obtain a virtual machine tool model; inputting the actual operation parameters into the virtual machine tool model to drive the virtual machine tool model to operate and obtain feedback information; and when and only when the collision point exists in the feedback information, controlling the virtual machine tool model and the double-machining-channel machine tool to stop running, and displaying the position displayed by the current actual running parameters of the virtual machine tool model. The double-machining-channel machine tool has the effect of improving the machining efficiency and safety of the double-machining-channel machine tool.

The invention discloses a preparation method of octafluorocyclopentene, which comprises the following two steps of: firstly, reacting 4-cyclopentene-1, 3-diketone with a selective fluorine reagent in acetonitrile under the condition of reflux to generate a crude product second mixture, purifying the second mixture, and putting the purified second mixture into a second-step reaction to obtain the octafluorocyclopentene. Reacting with diethylamino sulfur trifluoride in dichloromethane to generate a third mixture; the method has the advantages of environment-friendly and simple reaction process, no generation of three wastes, low cost, easy obtaining, simple reaction process, mild reaction, no generation of waste gas pollution even if nitrogen protection is needed, easy operation, and suitableness for industrial production.

The invention belongs to the technical field of organic synthesis of pesticides, and discloses a synthesis method of pyroxasulfone. The synthesis method of pyroxasulfone comprises the following steps: taking an intermediate A as shown in a formula (I) and a sulfonating agent, and adding a catalyst for reaction to obtain an intermediate B as shown in a formula (II); taking the intermediate B and an intermediate C as shown in a formula (III), and reacting under an alkaline condition to obtain pyroxasulfone. According to the synthesis method of pyroxasulfone, reaction steps are reduced, and the process duration and the production period of pyroxasulfone are greatly shortened; the used raw materials are low in cost and easy to obtain, the reaction conditions are mild, and oxidants such as hydrogen peroxide are not needed; meanwhile, few three wastes are generated in the technological process, and the method is environmentally friendly, is suitable for green large-scale production, and is a green synthesis method which is efficient, environmentally friendly and easy to control.

The invention discloses a method for adaptively adjusting tire vulcanization time, and relates to the technical field of tire production. By monitoring and calculating key elements in the tire production process, the vulcanization time of the tire can be adjusted in real time. Compared with a previous tire vulcanization production method, the problems that in the tire vulcanization production process, the safety time of the technology is long, the over-vulcanization degree of the tire is high, the performance of the tire is reduced, and meanwhile energy waste is large are solved. And the problems that the vulcanization time cannot be adjusted in real time in the conventional tire vulcanization method and the vulcanization is insufficient under certain extreme conditions can be effectively avoided, and the process safety is improved.

The present invention relates to the technical field of metal plate coil processing, and in particular to a feeding device for metal plate processing and rolling for engineering construction. The present invention provides a feeding device for metal plate processing and rolling for engineering construction, which can avoid safety accidents caused by the rotation of the steel coil stand during the metal plate coil loading process or when the metal plate coil loading is not completed, and improve the safety of metal plate processing. A feeding device for metal plate processing and rolling for engineering construction includes a base, a motor, a rotating shaft, etc., a motor is connected to the upper left side of the base, and a rotating shaft is connected to the motor output shaft. When the uppermost corner block of the present invention is retracted inward, the push plate is squeezed to move to the left, pushing the secondary bevel gear to move to the left, so that the main bevel gear and the secondary bevel gear are meshed, thereby achieving the effect of avoiding safety accidents caused by the rotation of the steel coil stand during the metal plate coil loading process or when the metal plate coil loading is not completed, and improving the safety of metal plate processing.

This invention relates to a fully automatic integrated machine for primary processing of basa fish, belonging to the field of fish primary processing equipment technology. It solves the problems of low automation levels, lack of dedicated equipment, poor adaptability of general-purpose equipment, uncontrollable gutting depth leading to fish meat contamination, and incomplete or damaged skinning; low efficiency and significant damage to fish meat due to fragmented multi-stage processing; and cross-contamination between viscera, head, tail, and finished product collection. A synchronous belt conveyor clamping device is horizontally mounted on the frame, with two sets of synchronous belt conveyors arranged side-by-side to form a clamping and conveying area, stably clamping the fish during transport. The processing device is sequentially equipped along the conveying direction with viscera removal, head and tail removal, back opening, skinning, and collection devices, enabling continuous automated viscera removal, head and tail removal, back opening, skinning, and finished product collection for basa fish. This invention achieves fully automated primary processing of basa fish, significantly improving processing efficiency, operational safety, and product reliability.

The application belongs to the technical field of optical part processing devices, and particularly relates to an intelligent processing device for precise parts of optical instruments, comprising a base; side plates are installed on the top of the base, grinding assemblies are arranged between the two groups of side plates, hollow sliding cavities are formed in the end portions of the two groups of side plates, two groups of linkage shafts are slidingly connected in the hollow sliding cavities, the two groups of linkage shafts are slidingly connected at the two ends of the grinding assemblies, purification assemblies for adsorbing and cleaning the grinding assemblies are installed on the outer walls of the two groups of side plates, the driving assembly is used for horizontally moving, adsorbing and rotating the lens of the optical instrument that needs to be edged, the lens is ground at the edge in the horizontal moving and rotating process through the grinding assembly, the ground lens is in a state of flat edge, and the lens before and after grinding can be subjected to optimized treatment of the construction environment through the continuous working of the purification assembly, so that the operation efficiency of self-adaptive processing and adjustment of a single lens is improved.

This invention discloses a Pickering emulsion based on silk fibroin self-assembled particles and its preparation method. The preparation method includes the following steps: adjusting the pH of the silk fibroin solution to 4.0-4.5, adding NaCl to a final concentration of 0.05-0.1 mol / L, mixing, and then heating to 40-50 °C and allowing it to stand at a constant temperature. Using the obtained silk fibroin self-assembled particle dispersion as the aqueous phase and vegetable oil as the oil phase, the mixture is mixed with excipients and homogenized by high-speed shearing to obtain a primary emulsion. This primary emulsion is then treated by high-pressure microfluidic jet to obtain the Pickering emulsion based on silk fibroin self-assembled particles. This method requires no chemical modification or exogenous reagents, is green and simple, and does not use organic solvents. It can prepare emulsions with high biosafety and high storage stability without emulsifiers, improving process safety and scalability, and broadening its application in the food, cosmetics, and biopharmaceutical fields.

The utility model discloses a fixing clamp for silicon carbide crystal ingot plane grinding machining, and relates to the technical field of silicon carbide crystal machining. Comprising a supporting mechanism, a rotary adjusting mechanism and a plurality of clamping mechanisms. The supporting mechanism is used for supporting and positioning the silicon carbide crystal ingot, the rotary adjusting mechanism and the clamping mechanism; the rotary adjusting mechanism comprises a rotary table, an adjusting rod and a locking arm; the clamping mechanism comprises a self-adaptive adjusting clamping jaw, the clamping jaw is connected with a first linear bearing, the bottom of the first linear bearing is connected with a rubber-coated bearing, and the rubber-coated bearing is used for converting the rotating motion of the turntable into the linear motion of the clamping mechanism on the first guide shaft; according to the utility model, the relative distance of the clamping jaws is adjusted to adapt to different crystal ingot diameters, and meanwhile, the clamping jaws have the compression force of the springs, so that the crystal ingot can be clamped more firmly, the processing safety is improved, and the product damage rate is reduced.

The utility model discloses an alkali metal recycling device which comprises an alkali metal reaction kettle and an alkali metal filter, a discharge port is arranged at the top of the alkali metal reaction kettle, a feed port is arranged at the bottom of the alkali metal filter, and the discharge port is connected with the feed port of the alkali metal filter through a straight pipeline. An extension pipe is arranged at a discharge port of the alkali metal reaction kettle in the kettle, a first switch valve is arranged at a feed port of the alkali metal filter, a filter baffle used for intercepting alkali metal is arranged in the alkali metal filter and comprises a regular hexagonal baffle framework, an elastic filter screen is arranged on the lower surface of the baffle framework, and a second switch valve is arranged on the lower surface of the elastic filter screen. By utilizing the device disclosed by the utility model, the problems of raw material waste, high wastewater treatment cost and high safety risk in the post-treatment process of excessive alkali metal are effectively solved.

The invention belongs to the technical field of organic chemical industry, and particularly relates to a method for preparing hexamethylenediamine through hydrogenation of 6-aminocapronitrile. Comprising the following steps: adding a 6-aminocapronitrile solution into a reaction kettle, activating a catalyst through hydrogen, transferring the activated catalyst into the reaction kettle under the protection of nitrogen, sealing, replacing air in the reactor with hydrogen, pressurizing to 1.5-8.0 Mpa, and stirring for reaction; after the reaction is finished, cooling to room temperature, taking a reacted mixture, and carrying out reduced pressure distillation to obtain hexamethylenediamine; the catalyst is an Al2O3 loaded copper-nickel-based catalyst. According to the method, the hexamethylenediamine is prepared by directly hydrogenating the 6-aminocapronitrile serving as the raw material without adding alkali or ammonia water, and the method is simple in production process, high in process safety, low in production cost, high in reaction conversion rate and yield, high in purity of the hexamethylenediamine and suitable for large-scale production.

The utility model relates to aluminium material draw bending technical field discloses a draw bending straightening device for aluminium material processing, including operation platform, the bottom fixed connection of operation platform has four support legs, four the bottom edge of support leg does smooth chamfer design, the top right side fixed connection of operation platform has three bending assembly, the inboard fixed connection of bending assembly has location component, the top left side fixed connection of operation platform has the setting component, the setting component includes the sliding slot, the sliding slot is set up in the inside of operation platform, the inside slide connection of sliding slot has the lead screw, the top rotatory connection of lead screw has the support block. In the utility model, through setting adjustable arc setting plate, using the sliding fit of lead screw in sliding slot, drive support block and setting plate flexible adjustment position, combining the sliding guide of slide and top plate, can accurate adaptation different arc requirement's aluminium material processing, improve processing applicability and finished product quality.

A method for manufacturing a large-scale balance weight of a steel sheet pile ship lift, which simplifies the processing flow of the large-scale balance weight. The method first cuts a continuous casting steel blank into single pieces of steel sheet pile with grooves, and measures and marks the steel sheet pile. Then, two groups of steel sheet pile are assembled together by processing and pre-installing gap pads. After the preliminary assembly is completed, the balance weight is marked again, and then the locking bolt holes, pin shaft holes and lifting lug holes are drilled and processed, and the holes are counterbored. The next step is to cut and install the edge plates at the top and bottom of the grooves. The trial lifting is performed and the lifting shaft hole reinforcing plates are pre-installed to ensure the stability of the structure. The stop seat plates are further processed and installed to provide protection for the final stability. Finally, the overall performance of the balance weight is verified by the second trial lifting, and the remaining edge plates are pre-installed. The present application can realize efficient processing of large-scale steel sheet pile balance weight by using conventional general equipment.

The application provides a low dielectric constant film forming method, which is applied to the field of semiconductor technology. Specifically, in the low dielectric constant film forming method provided by the application, air or inert gas and other gases are fully blown into a silicon-containing precursor liquid source required for film formation in the form of micro-nano bubbles by using a micro-nano bubble generating device, so that a low dielectric constant film with a porous structure can be formed without using chemical pore-forming agents such as organic pore-forming agents; and in the low K film forming method provided by the application, micro-nano bubbles are introduced as pore-forming templates by blowing air in the film precursor liquid source, so that the porosity regulation difficulty of the formed low K film can be reduced while achieving the purposes of reducing the amount of chemicals used, reducing the process manufacturing cost and improving the process safety, and then the process steps and the tape-out cost are finally reduced.

The utility model relates to laser cutting technical field especially, it relates to a kind of auxiliary support device for laser pipe cutting machine.Aiming at the technical problem that the overhanging part will bend downward due to its own gravity in the process of laser pipe cutting machine cutting pipe, affect the processing accuracy.A kind of auxiliary support device for laser pipe cutting machine, including base;Two guide rails are installed on base;Two guide rails are slidably connected with support frame;Rotary support bearing is installed in support frame;Profile clamping tool is installed on the inner ring of rotary support bearing.The utility model realizes a multifunctional auxiliary support unit of automatic centering clamping, rotary follow-up support and axial sliding support by integrating profile clamping tool on the inner ring of rotary support bearing, effectively avoids the error and inefficiency of manual adjustment, and provides stable support for circumferential cutting, greatly inhibits the rotary vibration of pipe overhanging end, and prevents pipe droop simultaneously.

The large wing wallboard numerical control machining tool comprises an assembling base assembly and a spare cutter assembly, a feeding positioning part which is fixedly connected in an inserted mode is arranged above one end of the assembling base assembly, and a pin milling machining mechanism which is fixedly connected in an inserted mode is arranged above the other end of the assembling base assembly; and a standby cutter assembly is arranged above one side of the pin milling machining mechanism. According to the device, a fire extinguisher is mounted in a sleeving mode through a tank body base on the side of the top end of the tower, in this way, when dangerous fire accidents occur, workers can conduct rapid treatment so as to reduce the loss condition of equipment, a Z sliding base is arranged on the front side of the tower, and the Z sliding base is slidably connected with a lifting block with the output end connected with a hydraulic telescopic rod; the anti-toppling base is arranged on one side of the lifting block, so that the motor base, the servo motor and the T-shaped tool bit can effectively avoid dangers caused by toppling during product machining operation, and the machining safety of the equipment is improved.

The utility model relates to door and window processing technical field especially door and window processing deburring device with it solves the problem that the existing technology adopts integral type polishing caterpillar to be difficult to adhere to the uneven profile surface or cross section change, leads to uneven contact pressure, appears to leak the grinding or grinding excessively, influences deburring quality consistency and processing efficiency problem. A kind of door and window processing deburring device, including workbench, bolster plate and drive motor, bolster plate is arranged at workbench top side, drive motor is arranged at the other side, and drive motor outer ring is connected with installation structure. The utility model replaces polishing caterpillar by adopting polishing roller, and it is driven along profile edge by combining horizontal movement module, so that polishing roller can better adhere to surface change, improve contact uniformity, effectively avoid leak grinding or overgrind, significantly improve the quality consistency and processing efficiency of deburring.

The invention provides tri (dimethylamino) cyclopentadienyl cerium as well as a preparation method and application thereof. The tri (dimethylamino) cyclopentadienyl cerium provided by the invention combines the spatial stability of a cyclopentadienyl ligand and the high reaction activity of a dimethylamino ligand, has appropriate volatility and lower thermal decomposition temperature, and is a cerium-based precursor with great potential. The preparation method of the tri (dimethylamino) cyclopentadienyl cerium provided by the invention has a better target product yield. The cerium-based precursor provided by the invention is tris (dimethylamino) cyclopentadienyl cerium, and has a structural formula shown in the specification.

The utility model relates to the related technical field of riveting connection, in particular to a high-adaptation riveting device based on angle fine adjustment, which is arranged on a movable platform and comprises an angle adjusting mechanism, and an air gun is arranged at the movable end of the angle adjusting mechanism. The angle adjusting mechanism comprises a telescopic piece and a driving assembly arranged on the moving platform and used for controlling the telescopic piece to deflect. The driving assembly is started to work to control the telescopic part to deflect relative to the moving platform, so that the position of the air gun can be finely adjusted, the telescopic part executes the telescopic action in the deflection process, the angle of the air gun can be accurately adjusted, and meanwhile the angle of the air gun can be accurately adjusted. The multi-angle adjustment can be achieved, the actual thickness of a plate can be better adapted, it is ensured that the riveting process is conducted smoothly, meanwhile, it can be ensured that the riveting nut can be correctly installed at different positions and angles, and the installation problem caused by angle deviation is avoided.

The utility model relates to working fluid filtering treatment technical field, and disclose advanced ceramic grinding processing working fluid filtration supply system, including the casing, still include: the baffle, the baffle fixedly connected in the casing, the casing front side is provided with the supply area, the casing right side is provided with the reflux area, the casing is provided with the filter mechanism, the filter mechanism surface is provided with the assembly mechanism, the filter mechanism includes: terminal filter, terminal filter fixedly connected in the casing, this advanced ceramic grinding processing working fluid filtration supply system, through setting up the supply area to the working fluid and makes the whole device to the working fluid supply of processing area and to the filtration of working fluid separate, namely, supply pump and reflux filter assembly independent work, both ensure the double -deck effective filtration to working fluid, and can ensure the flow and pressure of working fluid supply to processing area.

The application discloses a preparation method of 1,2-propylenediamine, which comprises the following steps: (1) 2-phenyl-5-methyl-2-oxazoline, ZIF-8 catalyst and liquid ammonia are added into a high-pressure reaction kettle, and after temperature rising, stirring and filtration, benzoyl 1,2-propylenediamine is obtained; (2) the benzoyl 1,2-propylenediamine obtained in the step (1), methanol and an alkali metal catalyst are added into an atmospheric pressure reaction kettle with a reflux device, after temperature rising and stirring, sulfuric acid is added to neutralize the alkali metal catalyst, after neutralization, the mixture is filtered, and the filtrate is subjected to distillation to obtain a mixture of methyl benzoate and 1,2-propylenediamine; (3) the mixture obtained in the step (2) is separated by rectification to obtain 1,2-propylenediamine products. The preparation method can reduce the production cost, the process condition is relatively mild, hydrogen is not needed to participate in the amination reaction, the process safety is higher, the raw material conversion rate is high, close to 100% conversion, the synthesis yield is higher than 90%, the preparation process is efficient and safe.