CN112495777A - Tea screening device for agricultural production - Google Patents
Tea screening device for agricultural production Download PDFInfo
- Publication number
- CN112495777A CN112495777A CN202011355906.7A CN202011355906A CN112495777A CN 112495777 A CN112495777 A CN 112495777A CN 202011355906 A CN202011355906 A CN 202011355906A CN 112495777 A CN112495777 A CN 112495777A
- Authority
- CN
- China
- Prior art keywords
- filter screen
- screening
- fixedly connected
- air
- screening chamber
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
Abstract
The invention discloses a tea screening device for agricultural production, which comprises a shell, wherein a screening chamber is arranged in the shell, and the inner top of the screening chamber is communicated with the outside through a feed hopper; trigger mechanism, trigger mechanism is including installing the motor in casing one side, the first bull stick of the terminal fixedly connected with of output shaft of motor, the cover is equipped with first gear on the first bull stick, the level is equipped with the slide bar in the screening chamber, both ends respectively with the inner wall fixed connection in screening chamber about the slide bar. When the equipment is used, the filter screen can be shaken left and right and up and down only by starting the motor, so that the filter screen can better screen tea, and meanwhile, the equipment only uses one motor when in use, thereby saving the energy consumption.
Description
Technical Field
The invention relates to the field of agricultural and sideline product processing, in particular to a tea screening device for agricultural production.
Background
Tea leaves, commonly called tea, generally comprise leaves and buds of tea trees, are eaten by people as dishes from the late spring and autumn, are developed into medicines in the middle of western Han, are developed into palace high-grade beverages in the later period of western Han, have a long development history, and until now, many people like to drink the tea leaves, so the tea planting is also continuously developed;
tea leaf is when making, need filter tealeaves, filters the many big leaves of the tea stalk of adulterating and some blades in the tealeaves, and traditional screening often all filters through artifical use screening net, though can the filter screen clean like this, but consume a large amount of labours, and the speed of screening is slow, leads to holistic screening efficiency to hang down, therefore we need design a tealeaves sieving mechanism for agricultural production to solve above problem.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides the tea screening device for agricultural production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a tea screening device for agricultural production comprises a shell, wherein a screening chamber is formed in the shell, and the inner top of the screening chamber is communicated with the outside through a feed hopper; the device comprises a shell, a trigger mechanism and a first gear, wherein the trigger mechanism comprises a motor arranged on one side of the shell, the tail end of an output shaft of the motor is fixedly connected with a first rotating rod, a first gear is sleeved on the first rotating rod, a sliding rod is horizontally arranged in the screening chamber, the left end and the right end of the sliding rod are respectively fixedly connected with the inner wall of the screening chamber, two sliding blocks used for sliding left and right are symmetrically arranged on the sliding rod, one side, away from the motor, of one sliding block is elastically connected with the inner wall of the screening chamber through a first spring, a connecting rod is fixedly connected between the two sliding blocks together, the right end of the connecting rod penetrates through the right sliding block, the right end of the connecting rod extends to the outside and is fixedly connected with a first rack; screening mechanism, the indoor symmetry of screening is equipped with two installation pieces, two the shake groove has all been seted up to the relative one end of installation piece, two be equipped with the filter screen jointly between the shake groove, the upper end of filter screen through respectively through two second springs with correspond the interior top elastic connection in shake groove, the both ends of filter screen respectively with correspond the inner wall sliding connection in shake groove.
Preferably, still include shake mechanism, shake mechanism includes that the level sets up the diaphragm in the screening chamber, two second racks, two are installed to the front side symmetry of diaphragm the upper end of sliding block all is equipped with the second bull stick, two the lower extreme of second bull stick rotates with the upper end that corresponds the sliding block respectively and is connected, two the upper end of second bull stick rotates with the lower extreme that corresponds the installation piece respectively and is connected, two all overlap on the second bull stick and be equipped with the second gear that the cooperation corresponds the second rack, two a plurality of commentaries on classics boards of equal fixedly connected with on the second bull stick, one of them the commentaries on classics board has magnetism, two magnetic blocks of lower extreme fixedly connected with of filter screen.
Preferably, the upper end of the transverse plate is fixedly connected with a collecting box, the upper end of the collecting box is provided with a collecting groove, and a notch of the collecting groove is connected with the lower end of the filter screen through elastic cloth.
Preferably, two the inboard wall fixed connection of gasbag and screening room, two are all passed through to the mutually opposite one side of installation piece the gasbag is all through intake pipe and external intercommunication, two the board of blowing, two are all installed to the relative one side of installation piece the lower extreme of board of blowing all with the upper end fixed connection of filter screen, two the chamber of ventilating has all been seted up in the board of blowing, two the chamber of ventilating all communicates with corresponding gasbag, two through the outlet duct in the intake pipe all install the check valve, two in the outlet duct relative one side in chamber of ventilating all sets up a plurality of blowing mouths of being convenient for blow.
Compared with the prior art, the invention has the beneficial effects that:
1. when tealeaves from getting into the screening room, the starter motor, the motor drives the sliding block on the right side and moves to the left, the sliding block on the right side drives the sliding block on the left side and moves to the left, the sliding block on the left side can extrude first spring when moving to the left, when two sliding blocks move to the limit distance on the left, first gear no longer with first rack toothing, two sliding blocks receive the elasticity of first spring and move back initial position, reciprocal such action, form the reciprocating motion that removes about two sliding blocks, and then rock about driving the filter screen, be favorable to scattering of tealeaves, better screening.
2. The rotation that can drive two second bull sticks about two second bull sticks, the rotation of two second bull sticks drives a plurality of commentaries on classics boards on it and rotates, because one of them commentaries on classics board has magnetism, when having magnetic commentaries on classics board and rotating to the below that is located corresponding magnetic block, can inhale mutually with the adjacent face of magnetic block, and then drive moving down of filter screen, when having magnetic commentaries on classics board and keeping away from the magnetic block, the filter screen then can be rebounded far away by two second springs, because the second bull stick is in the rotation state, so the filter screen shakes from top to bottom always, make tealeaves can be better dispersion on the filter screen open, the screening rate of tealeaves has been improved.
3. When two installation pieces moved to the left, extrude the filter screen with the gas in the gasbag of left side, blow tealeaves, can be so that tealeaves on the filter screen dispersion more even, the gasbag of right side absorbs external gas simultaneously, when two installation pieces moved to the right, then can extrude the gasbag of right side, and the gasbag of left side absorbs external gas, because reciprocating motion about two installation pieces can carry out, so two gasbags also can expand flexible always, make the screening effect of tealeaves better, this equipment is when using simultaneously, only used a motor, the consumption of the energy has been reduced.
Drawings
FIG. 1 is a schematic structural diagram of a tea screening device for agricultural production according to the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 6 is an enlarged schematic view of fig. 5 at D.
In the figure: the device comprises a shell 1, a screening chamber 2, a feed hopper 3, a motor 4, a first gear 5, a first rack 6, a first rotating rod 7, a sliding rod 8, a sliding block 9, a first spring 10, a connecting rod 11, a transverse plate 12, a second rack 13, a second gear 14, a second rotating rod 15, a rotating plate 16, a mounting block 17, a shaking groove 18, a filter screen 19, a second spring 20, a magnetic block 21, a collecting box 22, an air inlet pipe 23, an air blowing plate 24, an air vent cavity 25, an air outlet pipe 26 and an air bag 27.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-4, a tea screening device for agricultural production comprises a shell 1, wherein one end of the shell 1 is fixedly connected with a support frame, so that the shell 1 can be moved conveniently and a space below the shell 1 can be cleaned conveniently, a screening chamber 2 is formed in the shell 1 and used for screening tea, the inner top of the screening chamber 2 is communicated with the outside through a feed hopper 3, so that the tea can better enter the screening chamber 2, and meanwhile, the tea is prevented from falling to the upper end of the shell 1;
the trigger mechanism is used for starting the whole device, the trigger mechanism comprises a motor 4 arranged on one side of a shell 1, the motor 4 needs to be arranged on a mounting rack when being mounted, the tail end of an output shaft of the motor 4 is fixedly connected with a first rotating rod 7 (the tail end of the output shaft penetrates through the mounting rack), a first gear 5 is sleeved on the first rotating rod 7, the first gear 5 is an incomplete gear, a sliding rod 8 is horizontally arranged in the screening chamber 2, the left end and the right end of the sliding rod 8 are respectively and fixedly connected with the inner wall of the screening chamber 2, two sliding blocks 9 used for sliding left and right are symmetrically arranged on the sliding rod 8, one side of one sliding block 9, which is far away from the motor 4, is elastically connected with the inner wall of the screening chamber 2 through a first spring 10, a connecting rod 11 is jointly and fixedly connected between the two sliding blocks 9, the right end of the, the first rack 6 is meshed with the first gear 5, and when the first rotating rod 7 drives the first gear 5 to rotate, the first gear 5 is meshed with the first rack 6 to drive the first rack 6 to move;
two mounting blocks 17 are symmetrically arranged in the screening chamber 2, shaking grooves 18 are formed in opposite ends of the two mounting blocks 17, a filter screen 19 is arranged between the two shaking grooves 18, the upper end of the filter screen 19 is elastically connected with the inner top of the corresponding shaking groove 18 through two second springs 20, and two ends of the filter screen 19 are slidably connected with the inner wall of the corresponding shaking groove 18, so that the filter screen 19 can move up and down conveniently;
the vibrating device also comprises a vibrating mechanism, the vibrating mechanism comprises a transverse plate 12 horizontally arranged in the screening chamber 2, two second racks 13 are symmetrically arranged on the front side of the transverse plate 12, second rotating rods 15 are arranged at the upper ends of the two sliding blocks 9, the lower ends of the two second rotating rods 15 are respectively and rotatably connected with the upper ends of the corresponding sliding blocks 9, the upper ends of the two second rotating rods 15 are respectively and rotatably connected with the lower ends of corresponding mounting blocks 17, second gears 14 matched with the corresponding second racks 13 are sleeved on the two second rotating rods 15, the second gears 14 are mutually meshed with the second racks 13, namely the second rotating rods 15 rotate to drive the second racks 13 to move, a plurality of rotating plates 16 are fixedly connected on the two second rotating rods 15, one rotating plate 16 has magnetism, two magnetic blocks 21 are fixedly connected at the lower end of the filter screen 19, the magnetic blocks 21 repel the adjacent surfaces of the magnetic rotating plates 16 to drive the filter screen 19 to move up and down, diaphragm 12's upper end fixedly connected with collecting box 22, the collecting vat has been seted up to the upper end of collecting box 22, and the collecting vat is convenient for collect tealeaves, and the notch of collecting vat passes through elastic cloth to be connected with filter screen 19's lower extreme, and elastic cloth just is hopper-shaped for flexible cloth, and the tealeaves of being convenient for gets into to collect the inslot.
When in use, a worker pours tea leaves into the screening chamber 2 from the feed hopper 3 and falls on the filter screen 19, then the motor 4 is started, the motor 4 drives the right sliding block 9 to move left through the meshing of the first gear 5 and the first rack 6, the right sliding block 9 drives the left sliding block 9 to move left through the connecting rod 11, the left sliding block 9 extrudes the first spring 10 when moving left, when the two sliding blocks 9 move left to a limit distance, because the first gear 5 is an incomplete gear, the meshing of the first gear 5 and the first rack 6 is finished at this moment, the sliding block 9 on the left receives the elasticity of the first spring 10 to drive the two sliding blocks 9 to return to an initial position, the return speed is high, when the first gear 5 is meshed with the first rack 6 again, the first rack 6 returns to the initial position, the reciprocating action is carried out in such a way, and the reciprocating action of moving the two sliding blocks 9 left and right is formed, while the two sliding blocks 9 move left and right, the two mounting blocks 17 are driven to move left and right through the two second rotating rods 15, and then the filter screen 19 is driven to swing left and right, so that the tea leaves can be scattered, and the screening can be better carried out;
when the two second rotating rods 15 move left and right, the second gears 14 on the two second rotating rods 15 are meshed with the corresponding second racks 13, so that the two second rotating rods 15 are driven to rotate, the rotating plates 16 on the two second rotating rods 15 are driven to rotate through rotation of the two second rotating rods 15, because one of the rotating plates 16 is magnetic, when the magnetic rotating plate 16 rotates to be positioned below the corresponding magnetic block 21, the magnetic rotating plate can repel adjacent surfaces of the magnetic block 21, so that the filter screen 19 is driven to move upwards, when the magnetic rotating plate 16 is far away from the magnetic block 21, the filter screen 19 can be rebounded back to the original position through the two second springs 20, and when the magnetic rotating plate 16 rotates to be positioned below the magnetic block 21 next time, the filter screen 19 is driven to move upwards, so that reciprocating is formed, the filter screen 19 can shake up and down all the time, so that tea leaves can be better dispersed on the filter screen 19, and the screening rate of the tea leaves is improved.
Example 2
Referring to fig. 5-6, the embodiment is different from embodiment 1 in that the opposite sides of the two mounting blocks 17 are fixedly connected to the inner wall of the screening chamber 2 through air bags 27, the two air bags 27 are communicated with the outside through air inlet pipes 23 to facilitate sucking the outside air into the air bags 27, the opposite sides of the two mounting blocks 17 are respectively provided with air blowing plates 24, the lower ends of the two air blowing plates 24 are respectively fixedly connected to the upper end of the filter screen 19, the two air blowing plates 24 are respectively provided with air vent cavities 25, the two air vent cavities 25 are respectively communicated with the corresponding air bags 27 through air outlet pipes 26, the two air outlet pipes 26 are respectively hoses to facilitate extruding the air in the air bags 27, the two air inlet pipes 23 and the two air outlet pipes 26 are respectively provided with check valves to facilitate controlling the unidirectional flow of the air, the opposite sides of the two air vent cavities 25 are respectively provided with a plurality of air blowing ports facilitating air blowing, and the plurality, is convenient for better blowing the tea.
In this embodiment, when the two mounting blocks 17 move to the left, the left air bag 27 is squeezed, the air in the left air bag 27 is squeezed onto the filter screen 19, tea leaves are blown, and then the left and right shaking and up and down shaking effects of the tea leaves are matched, so that the tea leaves can be dispersed more uniformly on the filter screen 19, meanwhile, the right air bag 27 sucks external air into the air bag 27 through the air inlet pipe 23, when the two mounting blocks 17 move to the right, the right air bag 27 is squeezed, the left air bag 27 sucks air through the corresponding air inlet pipe 23, and as can be known from embodiment 1, the two mounting blocks 17 can move back and forth, so that the two air bags 27 can be expanded and stretched all the time, so that the tea leaf screening effect is better, and when the device is used, only one motor 4 is used, so that the energy consumption is reduced;
it should be noted that the screened tea leaves will fall into the collecting tank, and a closable protection door (not shown) may be provided at the front side of the housing 1 to facilitate the removal of the tea leaves.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The utility model provides a tealeaves sieving mechanism for agricultural production which characterized in that includes:
the screening device comprises a shell (1), wherein a screening chamber (2) is formed in the shell (1), and the inner top of the screening chamber (2) is communicated with the outside through a feed hopper (3);
trigger mechanism, trigger mechanism is including installing motor (4) in casing (1) one side, the terminal fixedly connected with first bull stick (7) of output shaft of motor (4), the cover is equipped with first gear (5) on first bull stick (7), the level is equipped with slide bar (8) in screening chamber (2), the left and right sides both ends of slide bar (8) respectively with the inner wall fixed connection of screening chamber (2), the symmetry is equipped with two sliding blocks (9) that are used for the horizontal slip on slide bar (8), one of them sliding block (9) keep away from one side of motor (4) through first spring (10) and the inner wall elastic connection of screening chamber (2), two common fixedly connected with connecting rod (11) between (9), the right-hand member of connecting rod (11) runs through sliding block (9) in the right side, the right-hand member of connecting rod (11) extends to outside and fixedly connected with first rack (6), the first rack (6) is meshed with the first gear (5);
screening mechanism, the symmetry is equipped with two installation pieces (17), two in screening room (2) the relative one end of installation piece (17) has all been seted up shake groove (18), two be equipped with filter screen (19) jointly between shake groove (18), the upper end of filter screen (19) is through respectively through two second spring (20) and the interior top elastic connection who corresponds shake groove (18), the both ends of filter screen (19) respectively with the inner wall sliding connection who corresponds shake groove (18).
2. The tea screening device for agricultural production according to claim 1, further comprising a shaking mechanism, wherein the shaking mechanism comprises a transverse plate (12) horizontally arranged in the screening chamber (2), two second racks (13) are symmetrically installed on the front side of the transverse plate (12), second rotating rods (15) are respectively arranged at the upper ends of the two sliding blocks (9), the lower ends of the two second rotating rods (15) are respectively and rotatably connected with the upper ends of the corresponding sliding blocks (9), the upper ends of the two second rotating rods (15) are respectively and rotatably connected with the lower ends of the corresponding mounting blocks (17), second gears (14) matched with the corresponding second racks (13) are respectively sleeved on the two second rotating rods (15), a plurality of rotating plates (16) are respectively and fixedly connected to the two second rotating rods (15), one of the rotating plates (16) has magnetism, the lower end of the filter screen (19) is fixedly connected with two magnetic blocks (21).
3. The tea screening device for agricultural production according to claim 2, wherein a collecting box (22) is fixedly connected to the upper end of the transverse plate (12), a collecting groove is formed in the upper end of the collecting box (22), and a notch of the collecting groove is connected with the lower end of the filter screen (19) through elastic cloth.
4. The tea screening device for agricultural production according to claim 1, wherein opposite sides of the two mounting blocks (17) are fixedly connected with the inner wall of the screening chamber (2) through air bags (27), the two air bags (27) are communicated with the outside through air inlet pipes (23), air blowing plates (24) are mounted on opposite sides of the two mounting blocks (17), the lower ends of the two air blowing plates (24) are fixedly connected with the upper end of the filter screen (19), air vent cavities (25) are formed in the two air blowing plates (24), the two air vent cavities (25) are communicated with the corresponding air bags (27) through air outlet pipes (26), one-way valves are mounted in the two air inlet pipes (23) and the two air outlet pipes (26), and a plurality of air blowing openings convenient for air blowing are formed in opposite sides of the two air vent cavities (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011355906.7A CN112495777A (en) | 2020-11-26 | 2020-11-26 | Tea screening device for agricultural production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011355906.7A CN112495777A (en) | 2020-11-26 | 2020-11-26 | Tea screening device for agricultural production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112495777A true CN112495777A (en) | 2021-03-16 |
Family
ID=74966753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011355906.7A Withdrawn CN112495777A (en) | 2020-11-26 | 2020-11-26 | Tea screening device for agricultural production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112495777A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113117889A (en) * | 2021-03-26 | 2021-07-16 | 梁凤珍 | Scrap iron filtering and recycling device for sewage treatment |
| CN113414930A (en) * | 2021-06-25 | 2021-09-21 | 滁州神州绝热科技有限公司 | Rubber and plastic blending foaming agent filling device |
| CN113730710A (en) * | 2021-09-26 | 2021-12-03 | 陈娜 | Dispensing and transfusion combined device for intravenous drug dispensing center |
| CN113975883A (en) * | 2021-12-06 | 2022-01-28 | 苏州禾能生物科技有限公司 | Plant protein draws with grinding thick liquid filter equipment |
| CN114393635A (en) * | 2022-03-04 | 2022-04-26 | 承德石油高等专科学校 | Dust extraction is used in building templates cutting |
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| CN208098556U (en) * | 2018-01-13 | 2018-11-16 | 东莞信鸿工程塑料有限公司 | A kind of vibrating screen material device of nylon plastic grains extruder |
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| CN210700491U (en) * | 2019-08-27 | 2020-06-09 | 大冶市西诚高分子材料有限公司 | Automatic production equipment for powder coating |
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| JP2012239926A (en) * | 2011-05-16 | 2012-12-10 | Hosokawa Micron Corp | Vibrating sieve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113117889A (en) * | 2021-03-26 | 2021-07-16 | 梁凤珍 | Scrap iron filtering and recycling device for sewage treatment |
| CN113414930A (en) * | 2021-06-25 | 2021-09-21 | 滁州神州绝热科技有限公司 | Rubber and plastic blending foaming agent filling device |
| CN113730710A (en) * | 2021-09-26 | 2021-12-03 | 陈娜 | Dispensing and transfusion combined device for intravenous drug dispensing center |
| CN113975883A (en) * | 2021-12-06 | 2022-01-28 | 苏州禾能生物科技有限公司 | Plant protein draws with grinding thick liquid filter equipment |
| CN114393635A (en) * | 2022-03-04 | 2022-04-26 | 承德石油高等专科学校 | Dust extraction is used in building templates cutting |
| CN114393635B (en) * | 2022-03-04 | 2023-12-22 | 承德石油高等专科学校 | Dust extraction for building templates cutting |
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