CN219259823U - Mud sample drying device - Google Patents
Mud sample drying device Download PDFInfo
- Publication number
- CN219259823U CN219259823U CN202222428095.XU CN202222428095U CN219259823U CN 219259823 U CN219259823 U CN 219259823U CN 202222428095 U CN202222428095 U CN 202222428095U CN 219259823 U CN219259823 U CN 219259823U
- Authority
- CN
- China
- Prior art keywords
- heating
- plate
- groove
- grooves
- tray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model provides a sludge sample drying device, which comprises: a heating plate, a plate cover and a heating base; the heating plate is provided with a plurality of grooves, the heating surface of the heating base is provided with heating grooves with the number and the relative positions corresponding to the grooves completely, and the concave surface of the heating groove is matched with the contour surface of the groove bottom of the groove; in the use state, the heating plate is placed on the heating base, and the heating plate is covered with the plate cover. The utility model also comprises an air pump and a gas washing bottle; the edge of the heating plate is provided with an air inlet hole which can be connected with an air pump and an air outlet hole which can be connected with a gas washing bottle. The drying device is simple in structure, practical, high in drying efficiency, energy-saving and environment-friendly. The matched design of the heating groove of the heating base and the groove of the heating disc can furthest increase the contact area of the heating disc and the heating surface, improve the heating efficiency, ensure more uniform heat transfer, and can discharge malodorous gas generated by drying into the gas washing bottle for washing, thereby avoiding environmental pollution.
Description
Technical field:
the utility model relates to the technical field of sludge treatment, in particular to a sludge sample drying device capable of automatically controlling a heating process.
The background technology is as follows:
sludge drying, also known as sludge dewatering, refers to the process of removing most of the water content from sludge by percolation or evaporation, etc. The general treatment mode is to adopt self-evaporation facilities such as a sludge drying bed (bed), and the like, and the water content of the sludge is further reduced by a physical method after the sludge is concentrated so as to facilitate the transportation, accumulation and utilization of the sludge or further treatment.
The existing sludge drying process mainly comprises hot water sludge drying, steam film drying and a solar sludge drying field, but the equipment used by the processes is generally complex in structure and high in price, has higher requirements on other use conditions such as fields and the like, and is unfavorable for recycling and reutilizing the dried sludge due to higher running cost and harsh use conditions. In addition, too high water content of the sludge can affect the combustion effect, and sludge drying generally requires that the water content of the sludge must be reduced below 40%, and auxiliary fuel or external heat can be used for realizing combustion. In addition, many malodorous gases generated in the sludge drying process also cause environmental pollution; therefore, the development of a set of device which is simple, practical, energy-saving, environment-friendly and capable of automatically controlling the sludge heating and drying process is very necessary.
The utility model comprises the following steps:
aiming at the problems, the utility model provides a sludge sample drying device which is simple, practical, energy-saving, environment-friendly and capable of automatically controlling a sludge heating and drying process, so as to solve the problems of complex equipment structure, high running cost and severe use conditions in the prior art.
The technical scheme of the utility model is as follows:
the sludge sample drying device comprises: a heating plate, a plate cover and a heating base; a plurality of grooves are formed in the disc surface of the heating disc, and the grooves form a convex groove bottom profile surface at the disc bottom of the heating disc; the upper surface of the heating base is a heating surface, heating grooves with the number and the relative positions which are completely corresponding to those of the grooves are formed in the upper surface of the heating base, and the concave surfaces of the heating grooves are matched with the shape of the outline surface of the groove bottom of the groove, so that when the heating plate is placed on the heating surface of the heating base, each groove on the heating plate is inserted into the heating groove corresponding to the position of the heating plate, and meanwhile, the outline surface of the groove bottom of the groove is tightly attached to the concave surface of the heating groove;
in the use state, the heating plate is placed on the heating base, and the heating plate is covered with the plate cover.
Further, the sludge sample drying device also comprises an air pump and a gas washing bottle; the heating plate is integrally a concave plate and is provided with a horizontal concave plate surface and opposite convex edges, and an air inlet hole and an air outlet hole which lead into the plate are arranged at the outer side of each edge; the air inlet is connected with the air outlet of the air pump, and the air outlet is connected with the air inlet of the gas washing cylinder; in the use state, the tray cover is pressed on the edges around the heating tray surface to completely cover the tray surface.
Further, grooves on the heating plate are all round hole-shaped grooves, and the bottom surface of each groove is horizontal; the grooves are arranged in an array on the surface of the heating plate.
Further, the outline of the tray cover is slightly smaller than that of the heating tray, a step for the edge of the tray cover to be in pressure connection is arranged on the surface of one side, facing inwards (towards the inside of the tray), of the edge of the heating tray, and the vertical heights of the air inlet hole and the air outlet hole at the edge of the heating tray are lower than those of the step.
Further, in the use state, when the tray cover covers the heating tray, the edge of the tray cover is in sealing contact with the edge of the heating tray.
Further, a handle is arranged at the edge of the heating plate; the center of the upper part of the disc cover is provided with a cover handle.
Further, the utility model provides a method for rapidly drying sludge by using the sludge sample drying device, which is characterized by comprising the following steps:
1) Placing a heating plate of the sludge sample drying device on a heating surface of a heating base, and enabling grooves on the heating plate to be inserted into heating grooves of the heating base in a one-to-one correspondence manner; connecting an air inlet of the heating plate with an air outlet of the air pump, and connecting an air outlet of the heating plate with an air inlet of the gas washing cylinder;
2) Adding a proper amount of clear water into a groove of the heating plate, starting the heating base to heat, and stopping heating when the clear water is heated to be completely boiled; taking the temperature of the clean water when the clean water is completely boiled as the upper limit temperature of the drying temperature range, and taking the temperature of the clean water when the clean water is completely stopped after heating is stopped as the lower limit temperature of the drying temperature range;
3) Putting a proper amount of quartz sand into a groove of a heating disc, starting a heating base to heat, adding a sludge sample into the groove when the temperature reaches a drying temperature range, covering a disc cover, opening an air pump, continuously heating, and keeping the temperature fluctuating in the drying temperature range;
4) And opening the tray cover at intervals in the heating process to observe the drying condition of the sludge, properly stirring the mixture of the sludge and quartz sand, and repeating the operation until the sludge is dried.
Further, the above steps 2) and 3) can be accomplished synchronously as follows: adding a proper amount of clear water into one groove of the heating plate, and adding a proper amount of quartz sand into the other grooves; starting a heating base to heat, stopping heating when the clean water is completely boiled, adding a sludge sample into a groove filled with quartz sand before the clean water is completely boiled, and recording the temperature when the clean water is completely boiled and the temperature when the clean water is completely boiled after stopping heating, wherein the temperature is respectively used as the upper limit temperature and the lower limit temperature of a drying temperature range; and when the clean water stops boiling completely, the clean water is heated again and the temperature is kept within the drying temperature range all the time.
The utility model has the beneficial effects that:
the sludge sample drying device is simple in structure, practical and high in drying efficiency. The heating groove on the heating base (heating surface) and the groove on the heating plate are completely corresponding in quantity and relative positions, and the concave surface of the heating groove is matched with the shape of the groove bottom profile surface of the groove, so that the heating surface of the heating base and the bottom surface of the groove on the heating plate are completely attached, the contact area of the heating plate and the heating surface is increased to the greatest extent, the heating efficiency is improved, the heat transfer is more uniform, the moisture of a sludge sample in the groove can be quickly evaporated under the heating state, and the drying purpose is achieved. On the basis, the side part of the heating disc is provided with the air inlet hole and the air outlet hole which can be connected with the air pump and the gas washing bottle in the use state, so that malodorous or foul gas generated in the sludge drying process is discharged into the gas washing bottle for washing, and the pollution to the environment caused by directly discharging harmful gas is avoided.
Description of the drawings:
FIG. 1 is a schematic view showing the overall structure of the heating plate of the present utility model on the side of the plate surface.
Fig. 2 is an a-direction view of fig. 1 (the hotplate is placed normally horizontally).
Fig. 3 is a view from direction B of fig. 1 (the hotplate is placed normally horizontally).
Fig. 4 is a partial enlarged view of a portion C in fig. 3.
Fig. 5 is a schematic view of the overall structure of the tray cover (cover face where the cover handle is located) of the present utility model.
Fig. 6 is an a-direction view of fig. 5 (disc cover is normally placed horizontally).
FIG. 7 is a schematic view showing the overall structure of the heating surface side of the heating base of the present utility model.
Fig. 8 is an a-direction view of fig. 7 (the heating base is placed normally horizontally).
Fig. 9 is a schematic view of the overall structure of the present utility model in a use state.
Fig. 10 is a schematic diagram of a basic module of the automatic temperature control heating mode of the present utility model.
FIG. 11 is a schematic diagram of an automatic temperature control heating apparatus to which the heating base of the present utility model is applied.
The specific embodiment is as follows:
the technical scheme of the utility model is specifically described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, 5, 7 and 9, the sludge sample drying device comprises: a heating plate 1, a plate cover 2 and a heating base 3; a plurality of grooves 11 are formed in the disc surface of the heating disc 1, and the grooves 11 form a convex groove bottom profile surface at the disc bottom of the heating disc; the upper surface of the heating base 3 is a heating surface 32, on which heating grooves 31 are arranged, the number and the relative positions of which completely correspond to those of the grooves 11, and the concave surfaces of the heating grooves 31 are matched with the shape of the groove bottom profile surfaces of the grooves 11, so that when the heating plate 1 is placed on the heating surface 32 of the heating base 3, each groove 11 on the heating plate 1 is inserted into the corresponding heating groove 31, and meanwhile, the groove bottom profile surfaces of the grooves 11 are tightly attached to the concave surfaces of the heating grooves 31; the design makes the heating surface 32 of the heating base 3 and the bottom surface of the groove of the heating plate 1 completely fit, the contact area between the heating plate 1 and the heating surface 32 is increased to the greatest extent, the heating efficiency is improved, the heat transfer is more uniform, and the moisture of the sludge sample in the groove can be quickly evaporated in a heating state, so that the drying purpose is achieved. In the use state, the heating plate 1 is placed on the heating base 2, and the heating plate 1 is covered with the plate cover 2.
As shown in fig. 3 and 9, the sludge sample drying device further comprises an air pump 4 and a gas washing bottle 5; the heating plate 1 is a concave plate integrally and is provided with a horizontal concave plate surface and opposite convex edges, and an air inlet hole 12 and an air outlet hole 13 which lead into the plate are arranged at the outer side of the edges; wherein, the air inlet hole 12 is connected with the air outlet of the air pump 4, and the air outlet hole 13 is connected with the air inlet of the gas washing bottle 5; in the use state, the tray cover 2 is pressed on the edge around the tray surface of the heating tray 1 to completely cover the tray surface.
The heating plate 1 is connected with the air pump 4 and the air washing bottle 5, so that the odor generated in the sludge drying process can be discharged to the atmosphere after being subjected to air washing treatment, and in the use state, when the air pump 4 is opened, the odor generated in the sludge sample drying process is discharged to the air washing bottle 5 by the heating plate 1 to be washed, and the odor is discharged to the atmosphere after being adsorbed by the filler substances such as water and activated carbon in the air washing bottle 5, so that the harm of direct discharge of the harmful gas to operators and the environment is avoided.
As shown in fig. 1 and 2, the grooves 11 on the heating plate 1 are all round hole-shaped grooves, and the bottom surface of each groove is horizontal; the grooves 11 are arranged in an array on the disk surface of the heating disk 1. In this embodiment, the number of grooves 11 on the heating plate 1 is 12, and the grooves are arranged in a 3×4 array. Correspondingly, as shown in fig. 7 and 8, the heating groove 31 on the heating base 3 is also a circular hole-shaped groove, and the bottom surface of the groove is horizontal.
As shown in fig. 4 and 9, the outline of the tray cover 2 is slightly smaller than that of the heating tray 1, a step 15 for pressing the edge of the tray cover 2 is arranged on the surface of one side of the edge of the heating tray 1 inwards (towards the inside of the tray), and the vertical height of the air inlet hole 12 and the air outlet hole 13 at the edge of the heating tray 1 is lower than that of the step 15. The step 15 structure at the edge of the heating disc 1 can enable the disc cover 2 to form 'embedded' cover pressure on the heating disc 1, which is more beneficial to forming a relatively airtight space in the heating disc 1, and ensures that gas in the disc can not escape from the edges of the disc and the cover basically in the drying process.
In order to further ensure that the gas in the hotplate 1 does not escape from the edge in the situation of use, the edge of the hotplate 2 is in sealing contact with the edge of the hotplate 1 when said hotplate 1 is covered by said hotplate 2. The sealing contact between the heating plate 1 and the plate cover 2 at the edge can be achieved by additionally arranging a sealing rubber ring or a rubber strip at the edge of the heating plate.
As shown in fig. 1 to 3, the edge of the heating plate 1 is provided with a handle 14, and in this embodiment, the handle 14 is symmetrically arranged at the edge of the heating plate 1 (fig. 1). As shown in fig. 5 and 6, a cover handle 21 is provided at the upper center of the tray cover 2.
Example 2
Further, the method for rapidly drying the sludge by using the sludge sample drying device comprises the following steps:
1) Placing the heating plate 1 of the sludge sample drying device on the heating surface 32 of the heating base 3, and enabling the grooves 11 on the heating plate 1 to be inserted into the heating grooves 31 of the heating base 3 in a one-to-one correspondence manner; an air inlet hole 12 of the heating plate 1 is connected with an air outlet of the air pump 4, and an air outlet hole 13 of the heating plate 1 is connected with an air inlet of the gas washing bottle 5;
2) Adding a proper amount of clean water into one groove 11 of the heating plate 1, starting the heating base 3 to heat, and stopping heating when the clean water is heated to be completely boiled; taking the temperature of the clean water when the clean water is completely boiled as the upper limit temperature of the drying temperature range, and taking the temperature of the clean water when the clean water is completely stopped after heating is stopped as the lower limit temperature of the drying temperature range; the temperature of the clean water when the clean water is completely boiled is 98 ℃, the temperature of the clean water when the clean water is completely stopped boiling after heating is stopped is 95 ℃, and the drying temperature (range) is 95-98 ℃.
3) Putting a proper amount of quartz sand into the groove 11 of the heating disc 1, starting the heating base 3 to heat, adding a sludge sample into the groove 11 when the temperature reaches a drying temperature range, covering the disc cover 2, opening the air pump 4, and continuously heating and keeping the temperature fluctuating in the drying temperature range;
4) The tray cover 2 is opened at intervals in the heating process to observe the drying condition of the sludge and properly stir the mixture of the sludge and quartz sand, and the operation is repeated until the sludge is dried.
Further, the above steps 2) and 3) can be accomplished synchronously as follows: adding a proper amount of clean water into one groove 11 of the heating plate 1, and adding a proper amount of quartz sand into the rest grooves 1; starting a heating base 3 to heat, stopping heating when the clean water is completely boiled, adding a sludge sample into a groove 11 filled with quartz sand before the clean water is completely boiled, and recording the temperature when the clean water is completely boiled and the temperature when the clean water is completely boiled after stopping heating, wherein the temperature is respectively used as the upper limit temperature and the lower limit temperature of a drying temperature range; and when the clean water stops boiling completely, the clean water is heated again and the temperature is kept within the drying temperature range all the time.
The heating base 3 may adopt various heating modes, wherein an automatic temperature control (or constant temperature) heating mode is preferable. Fig. 10 is a schematic diagram of a basic module of an automatic temperature control heating method suitable for the present utility model. As shown in fig. 10, the heating base 3 is composed of the following basic modules: the temperature controller adopts a digital temperature controller, and is provided with a temperature display device and an external control input button which can be used for presetting the heating temperature. Fig. 11 shows a preferred device design when the heating base 3 adopts an automatic temperature control heating mode: a heater 33 is arranged in the main body of the heating base 3, and the heater 33 is positioned below the heating surface 32; a control panel 34 and a display panel 35 are arranged above one side of the main body of the heating base 3, an input key 35 capable of setting working parameters such as heating temperature, gear position and time is arranged in the control panel 34, and a temperature display screen 351 capable of displaying the heating temperature in real time, a fault alarm indicator 352, an automatic heating off state indicator 353, an automatic heating on state indicator 354 and a temperature holding indicator 355 are arranged in the display panel; the temperature maintaining indicator 355 is used to indicate whether the temperature is maintained within the drying temperature range.
Example 3
And (3) testing a sensitization effect: a comparative experiment of the drying effect of the sludge sample was carried out using a conventional drying oven (DHG-9053 type) and the present utility model (apparatus of example 1). Two sets of equal weight semi-dry sludge samples are weighed and respectively placed in a drying oven and the utility model, and two sets of equal weight full-wet sludge are weighed and respectively placed in the drying oven and the utility model. Wherein, the semi-dry sludge and full-wet sludge samples in the drying box are respectively marked as 1 and 2; the semi-dry sludge and full-wet sludge samples in the utility model are respectively marked as 3 and 4. The working parameters of the drying oven are set as follows: 125 ℃, 1atm, 720min. The present utility model employs the method of example 1, and the table of the operating parameters of the present utility model is shown in fig. 1.
Table 1 working parameter table of sludge drying apparatus
The comparative test results are shown in fig. 2: the time required for completely drying the semi-dry sludge and the full-wet sludge samples is obviously shorter than that of a drying box, and the drying time of the drying box for the semi-dry sludge and the full-wet sludge samples is several times that of the utility model.
Table 2 comparison of drying oven and sludge drying efficiency of the present utility model
The utility model has the advantages of high drying efficiency, rapid drying of sludge and additional energy conservation.
The energy-saving effect is calculated according to the electricity price of 0.5 yuan/kW.h, as shown in the table 3, from the aspect of electricity utilization efficiency, the residual sludge with the same volume is dried, the electric quantity required by the oven is 11 times of that of a self-made drying device, and the electricity utilization cost can be saved by continuously running for one year: (3.32-0.3) ×24×0.5×365=13140 elements.
TABLE 3 comparison of the power and consumption of the utility model and the drying oven
The utility model also has the following advantages in the using process: 1) The sludge can be heated uniformly in the heating plate, so that the phenomenon of local overheating and coking is not easy to occur; 2) The drying can be processed in a partitioning way, problems can be timely adjusted, and the maintenance is convenient; 3) The airtight drying can be carried out, and simultaneously malodorous gas in the drying process is collected and treated; 4) The heating can be automatically controlled and monitored at any time, and the heating device is safe and convenient to operate.
Claims (6)
1. A sludge sample drying device, characterized by comprising: a heating plate, a plate cover and a heating base; a plurality of grooves are formed in the disc surface of the heating disc, and the grooves form a convex groove bottom profile surface at the disc bottom of the heating disc; the upper surface of the heating base is a heating surface, heating grooves with the number and the relative positions which are completely corresponding to those of the grooves are formed in the upper surface of the heating base, and the concave surfaces of the heating grooves are matched with the shape of the outline surface of the groove bottom of the groove, so that when the heating plate is placed on the heating surface of the heating base, each groove on the heating plate is inserted into the heating groove corresponding to the position of the heating plate, and meanwhile, the outline surface of the groove bottom of the groove is tightly attached to the concave surface of the heating groove; in the use state, the heating plate is placed on the heating base, and the heating plate is covered with the plate cover.
2. The sludge sample drying apparatus of claim 1 wherein: the sludge sample drying device also comprises an air pump and a gas washing bottle; the heating plate is integrally a concave plate and is provided with a horizontal concave plate surface and opposite convex edges, and an air inlet hole and an air outlet hole which lead into the plate are arranged at the outer side of each edge; the air inlet is connected with the air outlet of the air pump, and the air outlet is connected with the air inlet of the gas washing cylinder; in the use state, the tray cover is pressed on the edges around the heating tray surface to completely cover the tray surface.
3. The sludge sample drying apparatus of claim 2 wherein: the grooves on the heating plate are round hole-shaped grooves, and the bottom surface of the groove is horizontal; the grooves are arranged in an array on the surface of the heating plate.
4. A sludge sample drying apparatus as claimed in claim 3, wherein: the outline of the tray cover is slightly smaller than that of the heating tray, a step for the edge of the tray cover to be in compression joint is arranged on the surface of the inward side of the edge of the heating tray, and the vertical heights of the air inlet and the air outlet at the edge of the heating tray are lower than those of the step.
5. The sludge sample drying apparatus of claim 4 wherein: in the use state, when the tray cover covers the heating tray, the edge of the tray cover is in sealing contact with the edge of the heating tray.
6. The sludge sample drying apparatus of claim 5 wherein: the edge of the heating plate is provided with a handle; the center of the upper part of the disc cover is provided with a cover handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222428095.XU CN219259823U (en) | 2022-09-14 | 2022-09-14 | Mud sample drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222428095.XU CN219259823U (en) | 2022-09-14 | 2022-09-14 | Mud sample drying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219259823U true CN219259823U (en) | 2023-06-27 |
Family
ID=86863283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222428095.XU Active CN219259823U (en) | 2022-09-14 | 2022-09-14 | Mud sample drying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219259823U (en) |
-
2022
- 2022-09-14 CN CN202222428095.XU patent/CN219259823U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206523014U (en) | It is a kind of to carry the medicinal material drying equipment that hot gas cycle utilizes device | |
| CN207801185U (en) | High-voltage electrical cabinet with heat dissipation and dehumidification functions | |
| CN219259823U (en) | Mud sample drying device | |
| CN115432905A (en) | Sludge sample drying device | |
| CN217609404U (en) | Automatic evaporation and concentration equipment for natural food processing | |
| CN210374333U (en) | Multifunctional nine-steaming nine-prepared-polygonum multiflorum drying equipment for processing | |
| CN206971835U (en) | A kind of bean curd stick baking room with generating function | |
| CN202013070U (en) | Microwave drying device for glass magnesium board | |
| CN215524011U (en) | A dry storage device for medical intermediate | |
| CN212279799U (en) | Edible mushroom processing and baking device | |
| CN206799168U (en) | A kind of cubic boron nitride powder purifying processing device | |
| CN107574639A (en) | A kind of energy-conserving and environment-protective cloth drying machine | |
| CN209783194U (en) | Petrochemical solid material drying device | |
| CN219301331U (en) | Carbonization structure for silicon carbide smelting furnace | |
| CN206688672U (en) | A kind of hot phase separation device of batch (-type) | |
| CN217165784U (en) | Automatic high-speed fermentation equipment of organic waste of accuse temperature | |
| CN206472373U (en) | A kind of LED aluminum base plate drying unit | |
| CN214582148U (en) | Intelligent drying bed | |
| CN218443123U (en) | Drying furnace for drying and calcining petroleum coke moisture without pollution | |
| CN220981832U (en) | Energy-saving sample baking electric furnace for sample preparation room | |
| CN212882484U (en) | Silica gel dewatering device | |
| CN2523210Y (en) | Apparatus for hot processing tea | |
| CN221859022U (en) | Graphite bipolar plate baking device | |
| CN220981946U (en) | Brick baking furnace utilizing waste heat of carbon black furnace | |
| CN218993864U (en) | Visual drying cabinet is used in LED lamp production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |