CN211334319U - Injection molding machine waste gas collection device - Google Patents
Injection molding machine waste gas collection device Download PDFInfo
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- CN211334319U CN211334319U CN201922292756.9U CN201922292756U CN211334319U CN 211334319 U CN211334319 U CN 211334319U CN 201922292756 U CN201922292756 U CN 201922292756U CN 211334319 U CN211334319 U CN 211334319U
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Abstract
The utility model belongs to the technical field of the exhaust-gas treatment technique and specifically relates to an injection molding machine waste gas collection device is related to, its technical scheme main points are: including the injection molding machine, be provided with the heater block on the injection molding machine, still including setting up the support body on the injection molding machine, the support body includes the bottom plate, locate the stand of bottom plate both sides respectively and locate the crossbeam between two stands, it is connected with two-way screw to rotate between bottom plate and the crossbeam, be equipped with drive two-way screw pivoted drive assembly on the bottom plate, two-way screw includes that the screw thread revolves to opposite first screw thread portion and second screw thread portion, be equipped with first gas collecting channel and second gas collecting channel on the two-way screw respectively, first gas collecting channel threaded connection is in first screw thread portion, second gas collecting channel threaded connection is in second screw thread portion, form the cavity that is used for collecting waste gas between first gas collecting channel and the second gas collecting channel, the heater block of injection molding machine runs through the cavity, first gas collecting channel is.
Description
Technical Field
The utility model belongs to the technical field of the exhaust-gas treatment technique and specifically relates to an injection molding machine waste gas collection device is related to.
Background
An injection molding machine is a machine which heats thermoplastic plastics into molten plastics and then applies high pressure to the molten plastics to inject the molten plastics into a plastic mold for molding, is widely applied in the production process of plastic parts and has great significance for industrial production. During the process of heating and melting plastics by the injection molding machine, water and harmful substances in the plastic raw materials are discharged out of the injection molding machine, so that a workshop is filled with plastic waste gas; nowadays, green and environment-friendly matters are increasingly paid attention to, a method for directly discharging waste gas is obviously not beneficial to environmental protection and physical health of workers, so that the injection molding machines in the current factory are often matched with a waste gas treatment system, the waste gas treatment system mainly comprises a central processing unit, an exhaust device, a conveying pipeline and a collecting device, firstly, the collecting device collects the waste gas generated by each injection molding machine, and then the waste gas is pumped out to the central processing unit through the conveying pipeline under the action of the exhaust device for harmless treatment, so that the adverse effect brought by the waste gas is reduced.
At present, referring to fig. 1, a waste gas collecting device for an injection molding machine in the prior art is provided, which mainly collects waste gas generated during a heating process of plastic raw materials, and the main technical features of the device include: be the collection cover 12 that leaks hopper-shaped setting, be provided with the opening on collecting cover 12, the opening part is provided with pipeline 10, and opening part and pipeline 10 intercommunication, the bottom of collecting cover 12 is provided with support column 13, support column 13 plays the effect that supports collection cover 12 and has made things convenient for collection cover 12 to place on injection molding machine 1. In the production process, the heating part of the injection molding machine 1 penetrates through a gap formed between the support columns, waste gas moves upwards into the collecting cover due to the chimney effect, the waste gas is pumped out into the conveying pipeline under the action of the exhaust device, and finally the waste gas reaches the central processing device for harmless treatment.
However, the exhaust gas collecting device in the prior art is susceptible to lateral airflow interference in the actual use process, so that the exhaust gas escapes, and the collecting effect of the exhaust gas is weakened.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an injection molding machine waste gas collection device, this injection molding machine waste gas collection device have the function that promotes the waste gas and collect the effect.
In order to achieve the above object, the utility model provides a following technical scheme:
an injection molding machine waste gas collecting device comprises an injection molding machine, wherein a heating part is arranged on the injection molding machine, the injection molding machine also comprises a frame body arranged on the injection molding machine, the frame body comprises a bottom plate, stand columns respectively arranged at two sides of the bottom plate and a cross beam arranged between the two stand columns, a bidirectional screw rod is rotatably connected between the bottom plate and the cross beam along the vertical direction, a driving component for driving the bidirectional screw rod to rotate is arranged on the bottom plate, the bidirectional screw rod comprises a first screw thread part and a second screw thread part with opposite screw thread turning directions, a first gas collecting hood and a second gas collecting hood are respectively arranged on the bidirectional screw rod, the first gas collecting hood is in threaded connection with the first screw thread part, the second gas collecting hood is in threaded connection with the second screw thread part, the first gas collecting hood is positioned right above the second gas collecting hood, and the first gas collecting hood and the, and a cavity for collecting waste gas is formed between the first gas-collecting hood and the second gas-collecting hood, a heating part of the injection molding machine penetrates through the cavity, and the first gas-collecting hood is provided with a conveying pipeline communicated with the cavity.
Through adopting above-mentioned technical scheme, through rotating two-way screw rod, make the first gas collecting channel that is located the different screw thread portion of two-way screw rod and second gas collecting channel be close to each other or keep away from, when first gas collecting channel and second gas collecting channel are close to the certain degree each other, first gas collecting channel and the mutual butt of second gas collecting channel, vacuole formation between first gas collecting channel and the second gas collecting channel during the butt, the heating part runs through the cavity, the waste gas that the heating part produced distributes to the cavity in, and first protection casing and second protection casing play the effect that separation waste gas distributes, the collection effect of waste gas has been promoted, waste gas is finally taken out through pipeline and is handled in central processing unit.
The utility model discloses further set up to: the bottom plate is provided with the installation piece, drive assembly includes pivot and a pair of intermeshing's bevel gear, the pivot rotate connect in the installation piece just run through in the relative both sides of installation piece, one of them bevel gear set up in on the two-way screw rod, another bevel gear set up in the one end of pivot.
By adopting the technical scheme, the bidirectional screw rod can be rotated under the action of the bevel gear by rotating the rotating shaft.
The utility model discloses further set up to: and one end of the rotating shaft, which is far away from the bevel gear, is fixedly connected with a hand wheel.
Through adopting above-mentioned technical scheme, the hand wheel has made things convenient for the rotation of pivot.
The utility model discloses further set up to: the two upright posts are provided with sliding grooves along the length direction of the upright posts, the side wall of the first gas collecting hood is provided with two first sliding blocks, the two first sliding blocks are connected in the two sliding grooves in a sliding mode respectively, the side wall of the second gas collecting hood is provided with two second sliding blocks, and the two second sliding blocks are connected in the two sliding grooves in a sliding mode respectively.
Through adopting above-mentioned technical scheme, first slider on the first gas collecting channel slides and connects in the spout, and the spout plays the guide effect to the removal of first gas collecting channel, and in addition, the second slider on the second gas collecting channel slides and connects in the spout, and the spout plays the guide effect to the removal of second gas collecting channel, and the spout makes first gas collecting channel and second gas collecting channel more stable in the motion process.
The utility model discloses further set up to: the top of the first gas-collecting hood is funnel-shaped, and the conveying pipeline is communicated with the top of the first gas-collecting hood.
By adopting the technical scheme, under the chimney effect, the waste gas tends to move upwards, and the conveying pipeline is communicated to the top of the first gas collecting hood, so that the waste gas is discharged in time.
The utility model discloses further set up to: the bottom plate is fixed on the injection molding machine through bolts.
Through adopting above-mentioned technical scheme, the bolt makes the support body firmly install on the injection molding machine, makes the support body injection molding machine relatively dismantle simultaneously, makes things convenient for waste gas collection device's maintenance.
The utility model discloses further set up to: the side wall of the first gas collecting hood is provided with a first driving block, the first driving block penetrates through a first threaded hole in the vertical direction, the bidirectional screw is in threaded connection with the first threaded hole, the side wall of the second gas collecting hood is provided with a second driving block, the second driving block penetrates through a second threaded hole in the vertical direction, and the bidirectional screw is in threaded connection with the second threaded hole.
By adopting the technical scheme, the bidirectional screw rod rotates, and the bidirectional screw rod enables the first driving block and the second driving block to generate the movement of mutually approaching and keeping away from each other, so that the first driving block drives the first gas collecting hood to move, and the second driving block drives the second gas collecting hood to move.
The utility model discloses further set up to: and a locking fastener is arranged between the first gas-collecting hood and the second gas-collecting hood.
Through adopting above-mentioned technical scheme, the hasp piece makes first gas collecting channel and second gas collecting channel play the locking effect in the course of the work, has guaranteed that first gas collecting channel and second gas collecting channel are more firm at the during operation.
To sum up, the utility model discloses a beneficial technological effect does:
1. by rotating the bidirectional screw, the first gas collecting hood and the second gas collecting hood are close to or far away from each other, when the first gas collecting hood and the second gas collecting hood are close to each other to a certain degree, the first gas collecting hood and the second gas collecting hood are abutted against each other, a cavity is formed between the first gas collecting hood and the second gas collecting hood when the first gas collecting hood and the second gas collecting hood are abutted against each other, the heating part penetrates through the cavity, waste gas generated by the heating part is emitted into the cavity, the first protective hood and the second protective hood play a role in blocking emission of the waste gas, and the collection effect of the waste;
2. the sliding chute plays a role in guiding the movement of the first gas-collecting hood, and the sliding chute plays a role in guiding the movement of the second gas-collecting hood, so that the sliding chute enables the first gas-collecting hood and the second gas-collecting hood to be more stable in the movement process;
3. the locking fastener enables the first gas-collecting hood and the second gas-collecting hood to play a role in locking in the working process, and the first gas-collecting hood and the second gas-collecting hood are guaranteed to be more stable in working.
Drawings
FIG. 1 is a schematic view of a prior art injection molding machine exhaust gas collection device;
fig. 2 is a schematic structural diagram in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another view angle in the embodiment of the present invention;
FIG. 4 is an enlarged view at A in FIG. 3;
fig. 5 is an assembly diagram in an embodiment of the invention;
fig. 6 is an assembly view of another perspective in an embodiment of the present invention;
fig. 7 is a schematic structural view of the first gas collecting channel and the second gas collecting channel abutting against each other in the embodiment of the present invention;
fig. 8 is a schematic diagram of the internal structure of the first gas collecting channel and the second gas collecting channel after the first gas collecting channel and the second gas collecting channel are cut open when they abut against each other in the embodiment of the present invention.
In the figure, 1, an injection molding machine; 101. a heating member; 2. a frame body; 21. a base plate; 211. mounting blocks; 22. a column; 221. a chute; 23. a cross beam; 3. a bidirectional screw; 31. a first threaded portion; 32. a second threaded portion; 4. a drive assembly; 41. a rotating shaft; 411. a hand wheel; 42. a bevel gear; 5. a first gas-collecting channel; 51. a first driving block; 511. a first threaded hole; 52. an exhaust port; 53. a first slider; 6. a second gas-collecting channel; 61. a second driving block; 611. a second threaded hole; 62. a second slider; 7. a semicircular notch; 8. a cavity; 9. a void; 10. a delivery conduit; 11. a fastener; 12. a collection hood; 13. and (4) a support column.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 2 and fig. 3, for the utility model discloses an injection molding machine exhaust gas collection device, including injection molding machine 1 and install support body 2 on injection molding machine 1, be provided with heater block 101 on the injection molding machine, wherein, injection molding machine 1 and its heater block 101 are no longer repeated here for prior art. In addition, the frame body 2 includes a bottom plate 21, set up respectively in the stand 22 of bottom plate 21 both sides and set up the crossbeam 23 between two stands 22, concretely, the bottom plate 21 is rectangular plate-shaped, the bottom plate 21 passes through the bolt and installs on injection molding machine 1, two stands 22 are all perpendicular with bottom plate 21, stand 22 is the cuboid form and with bottom plate 21 integrated into one piece, crossbeam 23 sets up along the horizontal direction, and the one end of crossbeam 23 welds in the top of one of them stand 22, the other end of crossbeam 23 welds in the top of another stand 22, it is connected with two-way screw rod 3 to rotate along vertical direction between bottom plate 21 and the crossbeam 23, the both ends of two-way screw rod 3 rotate through the bearing (not marked in the figure) respectively and bear on bottom plate 21.
Referring to fig. 3 and 4, a driving assembly 4 for driving the bidirectional screw 3 to rotate is disposed on the bottom plate 21, specifically, the bottom plate 21 is integrally formed with a mounting block 211, the mounting block 211 is rectangular, and the mounting block 211 is perpendicular to the bottom plate 21, the driving assembly 4 includes a rotating shaft 41 and a pair of bevel gears 42 engaged with each other, the rotating shaft 41 is rotatably connected to the mounting block 211 through a bearing (not shown in the drawings) and penetrates through opposite sides of the mounting block 211, in addition, one of the bevel gears 42 is mounted at the bottom of the bidirectional screw 3 through a flat key, the other bevel gear 42 is mounted at one end of the rotating shaft 41 close to the bidirectional screw 3 through a flat key, furthermore, a hand wheel 411 is welded at one end of the rotating shaft 41 far from the bevel gears 42, by rotating the hand wheel 411, the rotating shaft 41 is rotated, and the bidirectional screw.
Referring to fig. 5, the bidirectional screw 3 includes a first thread part 31 and a second thread part 32 having opposite thread directions, the first thread part 31 is located at an upper portion of the bidirectional screw 3, and the second thread part 32 is located at a lower portion of the bidirectional screw 3. The two-way screw 3 is respectively provided with a first gas-collecting hood 5 and a second gas-collecting hood 6, the first gas-collecting hood 5 and the second gas-collecting hood 6 are both arranged in a hollow manner, the bottom of the first gas-collecting hood 5 is provided with an opening, the top of the second gas-collecting hood 6 is provided with an opening, the first gas-collecting hood 5 is positioned right above the second gas-collecting hood 6, and the opening end of the first gas-collecting hood 5 is opposite to the opening end of the second gas-collecting hood 6. In addition, the first gas collecting channel 5 is screwed to the first screw thread part 31, the second gas collecting channel 6 is screwed to the second screw thread part 32, specifically, a first driving block 51 is integrally formed on the side wall of the first gas collecting channel 5, the first driving block 51 is rectangular, a first screw hole 511 penetrates through the first driving block 51 along the vertical direction, and the first screw thread part 31 of the bidirectional screw 3 is screwed into the first screw hole 511; the side wall of the second gas collecting hood 6 is provided with a second driving block 61, the second driving block 61 is in a cuboid shape, the second driving block 61 penetrates through a second threaded hole 611 along the vertical direction, a second threaded portion 32 of the bidirectional screw 3 is in threaded connection with the second threaded hole 611, when the bidirectional screw 3 rotates in different directions, under the effect of threaded engagement, the first driving block 51 and the second driving block 61 move close to and away from each other along the vertical direction, in addition, the first driving block 51 drives the first gas collecting hood 5 to move, the second driving block 61 drives the second gas collecting hood 6 to move, and the first gas collecting hood 5 and the second gas collecting hood 6 move close to or away from each other along the vertical direction.
Referring to fig. 5 and 6, the two columns 22 are both provided with a sliding groove 221 along the length direction thereof, the sliding groove 221 is located on the side wall of the column 22 close to the side of the first gas-collecting hood 5, two first sliding blocks 53 are integrally formed on the side wall of the first gas-collecting hood 5, the two first sliding blocks 53 are slidably connected in the two sliding grooves 221 respectively, two second sliding blocks 62 are integrally formed on the side wall of the second gas-collecting hood 6, the two second sliding blocks 62 are respectively connected in the two sliding grooves 221 in a sliding manner, in order to ensure the stability between the first sliding block 53 and the second sliding block 62 and the sliding groove 221 during the sliding process, the cross-sectional shapes of the first sliding block 53 and the second sliding block 62 should be adapted to the cross-sectional shape of the sliding groove 221, the cross-sectional shape of the sliding groove 221 may be T-shaped or dovetail-shaped, in the present embodiment, the cross-sectional shape of the sliding groove 221 is dovetail-shaped, and accordingly, the cross-sectional shapes of the first sliding block 53 and the second sliding block 62 are dovetail-shaped. The sliding groove 221 guides the movement of the first gas collecting channel 5, and meanwhile, the sliding groove 221 guides the movement of the second gas collecting channel 6, and the sliding groove 221 makes the first gas collecting channel 5 and the second gas collecting channel 6 more stable in the movement process.
Referring to fig. 7 and 8, as the first gas collecting channel 5 and the second gas collecting channel 6 are continuously close to each other, finally the first gas collecting channel 5 and the second gas collecting channel 6 are abutted against each other, the side walls of the two opposite sides of the first gas collecting channel 5 are respectively provided with a semicircular notch 7, the two opposite sides of the second gas collecting channel 6 are respectively provided with a semicircular notch 7, when the first gas collecting channel 5 and the second gas collecting channel 6 are abutted against each other, the semicircular notches 7 on the two sides of the first gas collecting hood 5 and the semicircular notches 7 on the two sides of the second gas collecting hood 6 are correspondingly spliced one by one to form two circular notches, a cavity 8 for collecting waste gas is formed between the first gas collecting hood 5 and the second gas collecting hood 6, a heating part 101 of the injection molding machine 1 penetrates through the cavity 8 through the two circular notches, the heating part 101 generates waste gas in the working process and emits the waste gas to the cavity 8, and at the moment, the first gas collecting hood 5 and the second gas collecting hood 6 separate the waste gas from the outside.
It should be noted that a gap 9 should be left between the circular notch and the heating component 101 of the injection molding machine 1, so that air outside the first gas collecting hood 5 and the second gas collecting hood 6 can enter the cavity 8 to achieve the introduction of the air flow, the distance of the gap 9 is not too large, and there is a possibility that the too large gap 9 may allow the exhaust gas to escape from the gap 9. The gap 9 is between 4 and 8 cm, preferably 5 cm in this embodiment. In addition, when the first gas-collecting hood 5 and the second gas-collecting hood 6 are mutually opened, the overhaul and the maintenance of the heating component 101 are facilitated, and the working condition requirements are met.
Referring to fig. 7 and 8, the first gas collecting channel 5 is provided with a conveying pipeline 10 communicated with the cavity 8, preferably, the top of the first gas collecting channel 5 is funnel-shaped, the top of the first gas collecting channel 5 is provided with an exhaust port 52, the conveying pipeline 10 is communicated with the exhaust port 52 at the top of the first gas collecting channel 5, and under the chimney effect, the waste gas tends to move upwards to communicate the conveying pipeline 10 with the top of the first gas collecting channel 5, so that the waste gas can be smoothly discharged to the conveying pipeline 10, and the waste gas can be discharged in time.
Referring to fig. 7, a locking fastener 11 is arranged between the first gas collecting channel 5 and the second gas collecting channel 6, in this embodiment, the locking fastener 11 is selected as two hasps, and the two hasps are arranged on one side of the frame body 2 away from the first gas collecting channel 5 and the second gas collecting channel 6, so that the hasps can lock the first gas collecting channel 5 and the second gas collecting channel 6 in the working process, and the first gas collecting channel 5 and the second gas collecting channel 6 are more stable during working.
The implementation principle of the embodiment is as follows: by rotating the hand wheel 411, the bidirectional screw 3 is driven to rotate under the action of the rotating shaft 41 and the bevel gear 42, the first gas collecting hood 5 and the second gas collecting hood 6 are far away from or close to each other in the vertical direction under the action of the bidirectional screw 3, and when the first gas collecting hood 5 and the second gas collecting hood 6 are far away from each other and are opened, a worker can maintain the heating part 101 of the injection molding machine 1; when first gas collecting channel 5 and second gas collecting channel 6 are close to each other to mutual butt, form cavity 8 between first gas collecting channel 5 and the second gas collecting channel 6, heating element 101 runs through cavity 8, the waste gas that heating element 101 produced in the course of the work distributes to cavity 8 in, first protection casing and second protection casing separate the waste gas, the diffusion of restriction waste gas, finally gather at first gas collecting channel 5 and the inside waste gas of second gas collecting channel 6 and are taken out through pipeline 10 and leave central processing unit and handle.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides an injection molding machine exhaust gas collection device, includes injection molding machine (1), be provided with heating block (101) on injection molding machine (1), its characterized in that: the injection molding machine is characterized by further comprising a frame body (2) arranged on the injection molding machine (1), wherein the frame body (2) comprises a bottom plate (21), stand columns (22) respectively arranged on two sides of the bottom plate (21) and a cross beam (23) arranged between the two stand columns (22), a bidirectional screw (3) is rotatably connected between the bottom plate (21) and the cross beam (23) along the vertical direction, a driving assembly (4) used for driving the bidirectional screw (3) to rotate is arranged on the bottom plate (21), the bidirectional screw (3) comprises a first thread part (31) and a second thread part (32) with opposite thread turning directions, a first gas collecting hood (5) and a second gas collecting hood (6) are respectively arranged on the bidirectional screw (3), the first gas collecting hood (5) is in threaded connection with the first thread part (31), and the second gas collecting hood (6) is in threaded connection with the second thread part (32), the first gas-collecting hood (5) is located right above the second gas-collecting hood (6), the first gas-collecting hood (5) and the second gas-collecting hood (6) are mutually abutted, a cavity (8) for collecting waste gas is formed between the first gas-collecting hood (5) and the second gas-collecting hood (6), a heating part (101) of the injection molding machine (1) penetrates through the cavity (8), and the first gas-collecting hood (5) is provided with a conveying pipeline (10) communicated with the cavity (8).
2. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: the bottom plate (21) is provided with a mounting block (211), the driving component (4) comprises a rotating shaft (41) and a pair of bevel gears (42) which are meshed with each other, the rotating shaft (41) is rotatably connected to the mounting block (211) and penetrates through two opposite sides of the mounting block (211), one of the bevel gears (42) is arranged on the bidirectional screw (3), and the other bevel gear (42) is arranged at one end of the rotating shaft (41).
3. The exhaust gas collecting device of an injection molding machine according to claim 2, wherein: and one end of the rotating shaft (41) far away from the bevel gear (42) is fixedly connected with a hand wheel (411).
4. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: the two upright columns (22) are provided with sliding grooves (221) along the length direction of the upright columns, the side wall of the first gas collecting hood (5) is provided with two first sliding blocks (53), the two first sliding blocks (53) are connected to the two sliding grooves (221) in a sliding mode respectively, the side wall of the second gas collecting hood (6) is provided with two second sliding blocks (62), and the two second sliding blocks (62) are connected to the two sliding grooves (221) in a sliding mode respectively.
5. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: the top of the first gas collecting hood (5) is funnel-shaped, and the conveying pipeline (10) is communicated with the top of the first gas collecting hood (5).
6. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: the bottom plate (21) is fixed on the injection molding machine (1) through bolts.
7. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: the side wall of the first gas collecting hood (5) is provided with a first driving block (51), the first driving block (51) penetrates through a first threaded hole (511) along the vertical direction, the two-way screw (3) is in threaded connection with the first threaded hole (511), the side wall of the second gas collecting hood (6) is provided with a second driving block (61), the second driving block (61) penetrates through a second threaded hole (611) along the vertical direction, and the two-way screw (3) is in threaded connection with the second threaded hole (611).
8. The exhaust gas collecting device of an injection molding machine according to claim 1, wherein: a locking fastener (11) is arranged between the first gas-collecting hood (5) and the second gas-collecting hood (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922292756.9U CN211334319U (en) | 2019-12-17 | 2019-12-17 | Injection molding machine waste gas collection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922292756.9U CN211334319U (en) | 2019-12-17 | 2019-12-17 | Injection molding machine waste gas collection device |
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| CN211334319U true CN211334319U (en) | 2020-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226129A (en) * | 2021-12-31 | 2022-03-25 | 广州龙穴管业有限公司 | Movable shed system for collecting volatile organic compounds |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226129A (en) * | 2021-12-31 | 2022-03-25 | 广州龙穴管业有限公司 | Movable shed system for collecting volatile organic compounds |
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