Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the metal 3D printing circulating filter device, and the sealing state is kept when the filter barrel is removed by arranging the back blowing device, the passivating device and the isolating valve.
The invention is realized by the following technical scheme:
the metal 3D printing circulating filter device comprises a filter vat, a blowback tank and a passivation assembly, wherein the filter vat, the blowback tank and the passivation assembly are arranged on a frame; the filter vat comprises a passivation material injection port, a back-blowing exhaust port, a back-blowing head, a filter element, a first isolation valve, a second isolation valve, a first air pipe joint and a second air pipe joint, wherein the passivation material injection port, the back-blowing exhaust port, the first air pipe joint and the second air pipe joint are all arranged on the vat wall of the filter vat, the first air pipe joint and the second air pipe joint are all connected with a pressure difference detection assembly, the pressure difference detection assembly is arranged on a frame and comprises a low-pressure end interface and a high-pressure end interface, the low-pressure end interface is connected with the first air pipe joint through an air pipe, and the high-pressure end interface is connected with the second air pipe joint through an air pipe; the back-blowing head and the filter element are both arranged in the filter barrel; the first end of the first isolation valve is connected with the blowback head at the top of the filter vat; the first end of the second isolation valve is connected with the bottom of the filter vat, and the second end of the second isolation valve is detachably connected with the collecting assembly; the back blowing tank is provided with a pulse valve, and the pulse valve is detachably connected with the second end of the first isolation valve; the passivation assembly comprises a passivation barrel and a spraying device, wherein a first air pipe inlet and a second air pipe inlet with opposite opening directions are formed in the barrel wall of the passivation barrel; the passivation barrel cover is symmetrically provided with a passivation barrel air inlet and a passivation barrel air outlet, the injection device is communicated with the passivation barrel, the first end of the injection device is provided with a third air pipe inlet, the second end of the injection device is provided with a passivation material outlet, the passivation material outlet is connected with the passivation material inlet through a connecting pipe, an air pipe connected with the passivation barrel air inlet is connected with a corresponding air source through a first electromagnetic valve, an air pipe connected with the first air pipe inlet and an air pipe connected with the second air pipe inlet are connected with corresponding air sources through a second electromagnetic valve, and an air pipe connected with the third air pipe inlet is connected with the corresponding air source through a third electromagnetic valve.
Preferably, the interior of the blowback tank is filled with a protective gas with pressure, and the protective gas enters the filter vat through the control of the pulse valve and is discharged through a blowback exhaust port.
Preferably, the filter vat is connected with the fan through the tuber pipe, be equipped with temperature sensor and wind speed sensor on the upside tuber pipe of fan.
Preferably, the temperature sensor, the wind speed sensor, the differential pressure detection assembly, the pulse valve and the electromagnetic valve are all in communication connection with the control system.
Preferably, the blowback vent and the passivation barrel vent are both provided with vent valves.
Preferably, the number of the blowback heads is the same as the number of the first isolation valves.
Preferably, the collecting assembly is arranged below the filter vat, a window is arranged on the side wall of the collecting assembly, and a rotary switch is arranged on the window.
Preferably, the filter vat, the blowback tank and the passivation vat are symmetrically provided with fixing pieces for being connected with the frame.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the blowback tank is arranged, so that shielding gas can be quickly sprayed into the surface of the filter element, the filter barrel monitors the pressure difference of the filter barrel in real time through the pressure difference detection assembly and prompts the system to carry out blowback operation for a plurality of times, black ash attached to the filter element is dropped off, and the filtration permeability of the filter element can be improved, so that the service life of the filter element is prolonged.
2. According to the invention, the passivation assembly is arranged, the argon gas is sprayed from the top of the passivation barrel to play a role in reducing oxygen in the passivation barrel, and the argon gas is rapidly and automatically sprayed from the spraying opening on the wall of the passivation barrel, so that the passivation material is disturbed in the passivation barrel, the passivation material is prevented from adhering to the wall of the passivation barrel, and the fluidity of the passivation material is enhanced; argon is sprayed at the bottom of the passivation barrel, so that passivation materials can be conveniently and quickly sprayed into the filter barrel and the surface of the filter element, and the risk coefficient of the filter element during replacement is reduced in the passivation process of the filter element.
3. According to the invention, the filter barrel, the blowback tank and the collecting assembly can be connected in a detachable way by arranging the first isolation valve and the second isolation valve, so that the filter barrel is convenient to assemble and disassemble, the filter barrel can be maintained in a sealing state when the whole filter barrel is detached into flame-retardant liquid, and the risk of replacing the filter element is further reduced.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention discloses a metal 3D printing circulation filtering device, which is shown in fig. 1 to 7 and comprises a filtering barrel 1, a back blowing tank 2, a passivation assembly 3, a temperature sensor 10, a wind speed sensor 11, a differential pressure detection assembly 12, a fan 13 and a frame 14, wherein the filtering barrel 1, the back blowing tank 2 and the passivation assembly 3 are arranged on the frame 14, the filtering barrel 1 is connected with the fan 13 through an air pipe 17, the fan 13 is arranged at the inner bottom of the frame 14, the back blowing tank 2 is positioned at one side of the filtering barrel 1, the temperature sensor 10 and the wind speed sensor 11 are arranged on an upper air pipe of the fan 13, and the temperature sensor 10 and the wind speed sensor 11 are in communication connection with a control system. The wall of the filter vat 1, the wall of the blowback tank 2 and the wall of the passivation vat 31 are respectively provided with a fixing piece 15, the positions of the fixing pieces 15 are mutually symmetrical, and the filter vat 1, the blowback tank 2 and the passivation vat 31 are respectively connected with the frame 14 through the fixing pieces 15 by means of fixing screws 7.
The filter vat 1 includes passivation material injection port 21, blowback gas vent 22, blowback head 24, filter core 23, first isolation valve 4, second isolation valve 5, first air pipe joint 8 and second air pipe joint 9, and passivation material injection port 21, blowback gas vent 22, first air pipe joint 8 and second air pipe joint 9 all locate on the staving of filter vat 1, and blowback gas vent 22 is located the below of passivation material injection port 21.
The blowback head 24 and the filter element 23 are both arranged in the filter vat 1, and the filter element 23 is arranged below the blowback head 24. The number of blowback heads 24 is plural, and the number of blowback heads 24 is the same as the number of first isolation valves 4. The first isolation valve 4 is disposed at the top of the filter vat 1, and a first end of the first isolation valve 4 is connected with the blowback head 24.
The blowback tank 2 is provided with a pulse valve 18 which is in communication connection with a control system, and the pulse valve 18 is detachably connected with the second end of the first isolation valve 4. The interior of the blowback tank 2 is filled with a protective gas under pressure, and in the embodiment of the invention the pressure in the blowback tank is preferably set to 0.4-0.6 MPa, i.e. when the pressure difference is less than 6 mbar, the pressure in the blowback tank 2 is set to 0.4MPa; the blowback tank 2 pressure was set at 0.5MPa at a differential pressure of 6-8 mbar; when the pressure difference is 8-10 mbar, the pressure of the blowback tank 2 is set to be 0.6MPa, the pulse valve 18 is started, and the protective gas enters the filter vat 1 through the blowback head 24 under the control of the pulse valve 18 and is discharged through the blowback exhaust port 22, and an exhaust valve is arranged at the blowback exhaust port 22.
The first end of the second isolation valve 5 is connected with the bottom of the filter vat 1, and the second end of the second isolation valve 5 is detachably connected with the collecting assembly 16. A collection assembly 16 is provided below the filter vat 1 for collecting residues of filter substances, such as black ash, discharged from the filter vat. The side wall of the collection assembly 16 is provided with a window 161 which is configured as a transparent window for facilitating the observation of the amount of black ash in the collection device. Window 161 is provided with a rotary switch to facilitate cleaning of the filter material within collection assembly 16.
The first air pipe joint 8 and the second air pipe joint 9 are both connected with a differential pressure detection assembly 12, and the differential pressure detection assembly 12 is arranged on the frame and is in communication connection with the control system. The differential pressure detection assembly comprises a low-pressure end connector and a high-pressure end connector, the low-pressure end connector is connected with the first air pipe joint through an air pipe, and the high-pressure end connector is connected with the second air pipe joint through an air pipe.
The passivation assembly 3 includes a passivation barrel 31, a passivation barrel cover 32, a passivation barrel inlet 38, a passivation barrel outlet 39, a spraying device 33, a passivation material outlet 36, a first air tube inlet 34, a second air tube inlet 35, and a third air tube inlet 37.
The first air pipe inlet 34 and the second air pipe inlet 35 are reversely arranged on the wall of the passivation barrel 1, namely, the opening directions of the first air pipe inlet and the second air pipe inlet are opposite, and the openings are arranged at 180 degrees on two sides of the passivation barrel. The passivation barrel cover 32 is disposed above the passivation barrel 31, and the passivation barrel inlet 38 and the passivation barrel outlet 39 are symmetrically disposed on the passivation barrel cover 32, and the passivation gas is filled through the passivation barrel inlet 38 and discharged through the passivation barrel outlet 39, and in the preferred embodiment of the present invention, the time for filling the passivation barrel inlet 38 with the passivation gas is preferably set to 20 seconds.
The spraying device 33 is provided at the bottom of the passivation barrel 31 and communicates with the passivation barrel. The third air pipe inlet 37 is provided at a first end of the spraying device 33, the passivation material discharging opening 36 is provided at a second end of the spraying device 33, and the passivation material discharging opening 36 is connected with the passivation material spraying opening 21 through a connection pipe.
The air pipes connected with the passivation barrel air inlet 38, the first air pipe inlet 34, the second air pipe inlet 35 and the third air pipe inlet 37 are all connected with an air source through electromagnetic valves.
The electromagnetic valves comprise a first electromagnetic valve 311, a second electromagnetic valve 312 and a third electromagnetic valve 313, are all in communication connection with a control system, and are automatically controlled through information feedback of the control system. The air sources are fixed on the frame and correspond to the positions of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, the air pipe connected at the air inlet 38 of the passivation barrel is connected with the corresponding air source through the first electromagnetic valve 311, the air pipe connected at the first air pipe inlet 34 and the second air pipe inlet 35 is connected with the corresponding air source through the second electromagnetic valve 312, the air pipe connected at the third air pipe inlet 37 is connected with the corresponding air source through the third electromagnetic valve 313, the air source pressure of the air sources with different functions is adjustable, the air sources with different functions are matched with the air sources with different functions, the air inlet time is controlled to be different, and therefore the air sources are matched with each other. An exhaust valve 314 is arranged on the air pipe connected with the exhaust port 39 of the passivation barrel.
The following describes the embodiments of the present invention further:
in normal filtering operation, the system is operated normally according to the set wind speed and temperature, the wind speed sensor 11 detects the wind speed of the whole system in real time and feeds the wind speed back to the control system in real time, and the control system adjusts the frequency of the fan 13 in real time through wind speed comparison to form a constant wind speed closed loop so as to ensure the constant wind speed in the printing process. The temperature sensor 10 monitors the temperature of the whole system in real time, controls the temperature to be within a preset standard value, and ensures the constant wind speed and stable temperature in the printing process. However, as the printing time continues to increase, black ash adheres to the surface of the filter element 23 in the filter cartridge 1, thereby decreasing the filtration permeability of the filter element 23.
The more black ash on the filter element, the larger the pressure difference, and the filtration permeability of the filter element is deteriorated. In order to timely acquire the black ash adhesion degree on the filter element and timely enable the black ash on the filter element to fall off, the device monitors the pressure of the filter vat 1 through the pressure difference detection component 12, the pressure difference detection component 12 feeds back the formed pressure difference information to the control system, and the control system prompts a user to carry out back blowing for many times through the pressure difference high limit set value. In a preferred embodiment of the present invention, the differential pressure sensing assembly includes a low pressure side interface and a high pressure side interface. The low pressure end connector is connected with the first air pipe joint 8, the high pressure end connector is connected with the second air pipe joint 9, and pressure difference is formed through pressure contrast of the two parts of the first air pipe joint 8 and the second air pipe joint 9. In a preferred embodiment, the pressure differential across the filter cartridge 1 is monitored in real time during the filtration process. During fine filtration, a high-pressure end interface of the pressure measuring end of the fine filtration barrel 20 is connected with the first air pipe joint 8, a low-pressure end interface of the pressure measuring end of the fine filtration barrel 20 is connected with the third air pipe joint 30, the pressure difference of the filtration barrel is monitored in real time during fine filtration, for example, the rough filtration pressure difference is 6 mbar, the back blowing pressure can be set to 0.4MPa by a user, for example, the rough filtration pressure difference is 6-8 mbar, the back blowing pressure can be set to 0.5MPa by the user, for example, the rough filtration pressure difference is 8-10 mbar, the back blowing pressure can be set to 0.6MPa by the user, and the back blowing operation is carried out on occasion, so that the service life of rough filtration is prolonged. When the fine filtration pressure difference reaches 8 mbar, the user can perform the replacement fine filtration operation at a time. The wind speed sensor 11 and the temperature sensor 10 are arranged on an upper air pipe of the fan 13 and are used for monitoring and adjusting the whole system in real time.
And (3) a filter vat back blowing process:
after receiving the information of the control system prompting back blowing, the pulse valve 18 is started, and the protective gas with pressure in the back blowing tank 2 rapidly enters the filter vat 1 from the back blowing tank 2 through the back blowing head 24 by controlling the action of the pulse valve, wherein in the preferred embodiment of the invention, the protective gas is argon. The air flow is expanded and amplified by the action principle of the back-blowing head 24, and rapidly impacts the filter element 23, so that the back-blowing effect is achieved, and the argon gas acts on the filter element 23. In the back blowing process, the second isolation valve 5 is in an open state, so that black ash attached to the surface of the filter element 23 can fall off under the back blowing effect and then directly fall into the collecting assembly 16, and argon is discharged from the back blowing exhaust port 22. The filter permeability of the filter element 23 is increased by the back-flushing function, thereby improving the service life of the filter element.
The operation process of the passivation device comprises the following steps:
since the residues such as black ash and the like remaining on the surface of the filter element 23 are easy to burn with air, the risk of burning the filter element is reduced by the process of passivating the filter element before replacing the filter element. And after passivation is finished, the filter barrel 1 is disassembled into the flame-retardant liquid to replace the filter element.
The passivation material outlet 36 of the passivation assembly 3 is connected with the passivation material injection port 21 on the filter cartridge 1 through a connection pipe, so that the passivation material is rapidly injected from the passivation material injection port 21 to the surface of the filter element 23, and the passivation material is attached to the surface of the filter element 23.
Firstly, powder of a passivation material is added into the passivation barrel 31, the passivation barrel cover 32 is well assembled, and the tightness of the passivation barrel is ensured. The first solenoid valve 311 is activated, argon is introduced into the passivation barrel 31 through the passivation barrel air inlet 38, and the argon is discharged through the passivation barrel air outlet 39. The control system presets the aeration time, which in the preferred embodiment of the present invention is preferably 20 seconds, and the entire operation may perform the oxygen reduction operation on the passivation tank 31.
Then, the third electromagnetic valve 313 is started, argon gas is filled into the third air pipe through the third air pipe inlet 37, the passivation material can be sprayed out from the passivation material outlet 36 under the action of the spraying device 33, the passivation material outlet 36 is connected with the passivation material spraying inlet 21 on the filter vat 1 through the connecting pipe, and the passivation material is sprayed into the surface of the filter element 23 in the filter vat. In this embodiment, the passivation material is mainly composed of calcium carbonate powder with a particle size of 400 mesh or more.
Because the passivation material has poor fluidity, in order to prevent the passivation material from adhering to the inner wall of the passivation barrel 31, the air pipes respectively connected with the first air pipe inlet 34 and the second air pipe inlet 35 are connected with the air source through the second electromagnetic valve 312, the second electromagnetic valve 312 is started, and argon is instantaneously introduced from the first air pipe inlet 34 and the second air pipe inlet 35 while the spraying device 33 sprays the passivation material, so that the passivation material is disturbed in the passivation barrel 31, and the fluidity of the passivation material in the passivation barrel 31 is increased.
When the filter element 23 is replaced, the first isolation valve 4, the second isolation valve 5 and three electric isolation valves (not shown in the figure) which are arranged on the wall of the filter vat and are in communication connection with the control system are closed at the same time, the fixing screws 7 on the two sides of the filter vat are removed, the filter vat 1 is separated from the frame, the blowback tank 2 and the collecting assembly 16, and the filter vat 1 is integrally removed and placed into flame-retardant liquid, wherein in the preferred embodiment of the invention, the flame-retardant liquid is usually water, and matched professional flame-retardant liquid can be used when special materials are printed.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.