CN103722702B - Non-return quantitative constant-pressure injection device - Google Patents
Non-return quantitative constant-pressure injection device Download PDFInfo
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- CN103722702B CN103722702B CN201310753456.0A CN201310753456A CN103722702B CN 103722702 B CN103722702 B CN 103722702B CN 201310753456 A CN201310753456 A CN 201310753456A CN 103722702 B CN103722702 B CN 103722702B
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- nozzle body
- hydraulic stem
- runner
- injection device
- main valve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76585—Dimensions, e.g. thickness
- B29C2945/76591—Dimensions, e.g. thickness volume
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76688—Injection unit nozzle
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of Non-return quantitative constant-pressure injection device, comprise nozzle body, spool mechanism, injection cylinder, hydraulic system and controller, described nozzle body offers runner and inlet, the spool mechanism opened or closed in order to nozzle body is arranged in nozzle body, described injection cylinder comprises oil cylinder body and is provided with the hydraulic stem of first piston in leading section, the described hydraulic stem with first piston stretches in the runner of nozzle body, described hydraulic system is connected for driving injection cylinder with oil cylinder body, it is characterized in that: described injection device also comprises hydraulic stem travel control device, described hydraulic system and hydraulic stem travel control device are all electrically connected with controller.Structure of the present invention is simple, reliability is high, can achieve interval, quantitative, level pressure injection.
Description
Technical field
The present invention relates to injection device field, specifically a kind of Non-return quantitative constant-pressure injection device.
Background technology
The injection that injection device is used to fluid is applicable to multiple occasion, as the high-pressure injection of Hydraulic Field, the calibrated shot of Chemical Manufacture, etc.In prior art, injection device often adopts the mode of periodical injections to inject, and now to realize calibrated shot, then needs to ensure uniform feeding (quantitative feeding namely under one-period).But, in many instances, cannot remain a constant speed charging or feed time indefinite, cause per injection amount different, namely cannot realize calibrated shot.Therefore, calibrated shot is as a kind of technical indicator and requirement, and prior art needs complicated mechanism to realize.
Such as, Chinese patent CN102431134A discloses a kind of injection device, this device mainly comprises injection framework, the cylinder components be installed on this injection framework, is contained in freely can rotate and the injection member of retreating, injection motor, the rotary motion that the driving by injection motor produces being converted to the direction of motion converter section of rotational motion to linear motion and metering motor in this cylinder barrel.Though this device can realize calibrated shot, but structure is also very complicated, and the accuracy of metering is not high.
For the injection device of prior art, need shut-off nozzle when charging, prevent under non-injection operating mode, fluid flows out from nozzle, therefore needs to arrange valve body in the injection device.Such as, Chinese patent CN102207215A discloses a kind of water-saving check valve, comprises nozzle body, spool and spring.Establish water route in nozzle body, water route inner hole surface comprises seal section and water saving section.The outer sheathed sealing ring of spool.Spring top supports spool, makes spool be subject to elastic force.If water route current forward flow and water pressure is greater than elastic force, then spool activity makes sealing ring be positioned at water saving section, and sealing ring extends out distortion with the area of section reducing sealing ring outer peripheral edge and economize on water between section inner hole surface by water pressure radial direction; Otherwise sealing ring is positioned at seal section, and sealing ring seal section inner hole surface.The inverse-stopping functions of this check (non-return) valve and water-saving function shared support and sealing ring, can reduce materials, and reduce manufacturing cost, can shorten spool axial length, minimizing takes up room, and simplifies valve core structure.Because this spool is consistent with the direction in nozzle body and water route, this structure can realize water-saving function.But this check (non-return) valve also exists following problem can not be solved, 1, when liquid seals by needs completely, this water-saving check valve then can not realize this function; 2, because it uses sealing ring radial direction that is stressed to extend out distortion to reduce current area to realize water-saving function, when environment for use as fluid temperature is higher, or when liquid has certain corrosivity, sealing ring also easily damages, and this device is also inapplicable; 3, because spool adopts axially to close, the runner in valve just needs to get around spool, and such runner is just relatively more bending and complicated, and resistance is large.
Summary of the invention
The technical problem to be solved in the present invention is, provides that a kind of structure is simple, reliability is high, can realize simultaneously intermittence, quantitatively, the Non-return quantitative constant-pressure injection device of level pressure injection.
Technical solution of the present invention is, a kind of Non-return quantitative constant-pressure injection device of following structure is provided, comprise nozzle body, spool mechanism, injection cylinder, hydraulic system and controller, described nozzle body offers runner and inlet, the spool mechanism opened or closed in order to nozzle body is arranged in nozzle body, described injection cylinder comprises oil cylinder body and is provided with the hydraulic stem of first piston in leading section, the described hydraulic stem with first piston stretches in the runner of nozzle body, described hydraulic system is connected for driving injection cylinder with oil cylinder body, described injection device also comprises hydraulic stem travel control device, described hydraulic system and hydraulic stem travel control device are all electrically connected with controller.
Adopt above structure, the present invention compared with prior art has the following advantages: adopt the present invention, during storing, fluid foods enters from inlet, spool mechanism radial seal runner, (now hydraulic system does not provide pressure to rely on the pressure produced in runner of fluid slowly to be ejected outward by the hydraulic stem with first piston, injection cylinder is in Light Condition), when hydraulic stem walks to hydraulic stem travel control device place, then open hydraulic system to inject, because hydraulic stem travel control device controls to inject at a certain ad-hoc location, therefore each injection volume constant (scheduled volume can be set), achieve intermittence, calibrated shot, simplified product structure simultaneously, reliability is high.
As improvement, described spool mechanism comprises main valve plug and spring, on described nozzle body, runner radial direction extends to form valve core channel, described spring one end is fixed on valve core channel, the other end is connected on main valve plug, the left side of main valve plug is the conical surface, contact with nozzle body as linear contact lay, the direction of motion of main valve plug is positioned in the radial direction of runner, the nozzle body inwall relative with valve core channel arranges interior pressure chamber, main valve plug arranges pod apertures, described pod apertures comprises radial section and Connectivity Section, described radial section communicates with interior pressure chamber, described Connectivity Section communicates with runner, the pressure of spring be greater than injection cylinder unloaded time first piston resistance.Adopt this design, under the effect of the spring force that fluid supports in its lower end at main valve plug, sealing is realized according to the pressure of fluid, during charging, fluid can enter from the Connectivity Section of pod apertures, flow through radial section, enter interior pressure chamber, the pressure of spring be greater than injection cylinder unloaded time first piston resistance, the pressure of fluid can back down first piston, make it under action of a fluid, reach the position set by hydraulic stem travel control device, the design utilizes hydraulic pressure to realize non-return sealing dexterously, the left side of main valve plug is designed to the conical surface, be linear contact lay with the contact of valve body, contact area is little, the normal pressure that spool is subject to and the frictional force that moves up and down little, good sealing effect, and when oil cylinder is injected, the hydraulic pressure of fluid raises, thus the fluid entering interior pressure chamber can be made to back down main valve plug, makes jet hole and flow passage, realizes injection.
As improvement, described interior pressure chamber is the stepped cavity that outer imperial palace is little, and the end area of main valve plug is greater than stepped cavity osculum size and is less than the large mouth size of stepped cavity, and main valve plug end props up the cascaded surface between the large mouth of stepped cavity and osculum under the action of the spring.When charging, interior pressure chamber fluid contacts end face contact area with main valve plug is osculum size, during injection, under the effect of suppressing, back down spring, now increase interior pressure chamber fluid contacts end face contact area with main valve plug instantaneously, considerably increase the active force to main valve plug, be conducive to opening of spool.
As improvement, described Connectivity Section tilts to be communicated with on radial section from top to bottom, and the one end be communicated with radial section is upper end.This design is mainly convenient to fluid when entering interior pressure chamber, reduces hydraulic pressure loss, and the fluid in interior pressure chamber can be flowed out by UNICOM's section smoothly, can not there is hydrops phenomenon.
As improvement, described hydraulic stem travel control device comprises the first travel switch and the second travel switch, the first described travel switch is arranged in nozzle body, and be positioned at the rear side of first piston, described second travel switch is arranged between nozzle body and oil cylinder body, and on hydraulic stem, be provided with the touching block matched with the second travel switch, in hydraulic stem traveling process, touch block can touch the second travel switch.Like this, by the first stroke switch control rule Fluid Volume, to reach calibrated shot, when first piston top is to nozzle body front end, the touching block on hydraulic stem just touches the second travel switch, thus hydraulic control system stalls.
As improvement, described injection device also comprises overflow valve, and described overflow valve is connected with hydraulic system, and is positioned at hydraulic system on the pipeline of oil cylinder body feed flow.Hydraulic system can be made to oil cylinder body constant-pressure liquid supply by overflow valve, meet level pressure injection requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of Non-return quantitative constant-pressure injection device of the present invention.
Shown in figure: 1, nozzle body, 2, hydraulic system, 3, controller, 4, runner, 5, inlet, 6, oil cylinder body, 7, first piston, 8, hydraulic stem, 9, main valve plug, 10, spring, 11, valve core channel, 12, interior pressure chamber, 13, pod apertures, the 14, first travel switch, 15, the second travel switch, 16, touching block, 17, overflow valve, 18, the second piston, 19, limited post, 20, check valve.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, Non-return quantitative constant-pressure injection device of the present invention, comprise nozzle body 1, spool mechanism, injection cylinder, hydraulic system 2 and controller 3, described nozzle body 1 offers runner 4 and inlet 5, the spool mechanism opened or closed in order to nozzle body 1 is arranged in nozzle body 1, described injection cylinder comprises oil cylinder body 6 and is provided with the hydraulic stem 8 of first piston 7 in leading section, the described hydraulic stem 8 with first piston 7 stretches in the runner 4 of nozzle body 1, described hydraulic system 2 is connected for driving injection cylinder with oil cylinder body 6, described injection device also comprises hydraulic stem travel control device, described hydraulic system 2 and hydraulic stem travel control device are all electrically connected with controller 3.
Described spool mechanism comprises main valve plug 9 and spring 10, on described nozzle body 1, runner 4 radial direction extends to form valve core channel 11, described spring 10 one end is fixed on valve core channel 11, the other end is connected on main valve plug 9, the left side of main valve plug 9 is the conical surface, contact with nozzle body 1 as linear contact lay, the direction of motion of main valve plug 9 is positioned in the radial direction of runner 4, nozzle body 1 inwall relative with valve core channel 11 arranges interior pressure chamber 12, main valve plug 9 arranges pod apertures 13, described pod apertures 13 comprises radial section and Connectivity Section, described radial section communicates with interior pressure chamber 12, described Connectivity Section communicates with runner 4, the pressure of spring 10 be greater than injection cylinder unloaded time first piston 7 resistance.
Described interior pressure chamber 12 is the stepped cavity that outer imperial palace is little, and the end area of main valve plug 9 is greater than stepped cavity osculum size and is less than the large mouth size of stepped cavity, and under spring 10 acts on, main valve plug 9 end props up the cascaded surface between the large mouth of stepped cavity and osculum.Described cascaded surface refers to that face that the large mouth of stepped cavity and osculum have a common boundary, that face that namely in accompanying drawing, main valve plug end props up.
Described Connectivity Section tilts to be communicated with on radial section from top to bottom, and the one end be communicated with radial section is upper end.
Described hydraulic stem travel control device comprises the first travel switch 14 and the second travel switch 15, the first described travel switch 14 is arranged in nozzle body 1, and be positioned at the rear side of first piston 7, described second travel switch 15 is arranged between nozzle body 1 and oil cylinder body 6, and on hydraulic stem 8, be provided with the touching block 16 matched with the second travel switch 15, in hydraulic stem 8 traveling process, touch block 16 can touch the second travel switch 15.The thickness of the first travel switch to the distance of main valve plug to be injection volume divided by the sectional area of runner add first piston, flow path wall is close to by the first travel switch, is as the criterion with the slip not affecting first piston.
Described injection device also comprises overflow valve 17, and described overflow valve 17 is connected with hydraulic system 2, and is positioned at hydraulic system 2 on the pipeline of oil cylinder body 6 feed flow.
The other end of described hydraulic stem 8 is provided with the second piston 18, and the second described piston 18 face area is greater than first piston 7 face area, and this design improves the pressure that first piston carries out injecting, and increases the expulsion pressure of nozzle.
Inwall in valve core channel 11 is provided with limited post 19, the fitting depth (degree of depth in valve core channel) of described limited post 19 equals the length of main valve plug; Spring guide or guide rod is provided with, for leading to spring in valve core channel 11.
At inlet, place is provided with feed tube, is provided with check valve 20 in the lower end of feed tube, thus the liquid of anti-fluid oppositely flows backwards.
The course of work of the present invention is as follows:
In the storing stage, liquid when the external world enters into runner by inlet, now, main valve plug is in top under spring force, and the runner of fluid blocks by spool, controller sends signal to hydraulic system (adopting hydraulic pump in the present embodiment), hydraulic pump is in resting state and does not provide pressure to hydraulic system, and along with getting more and more of fluid, the left end of runner is sealed by spool, fluid can only move on the right side of runner, promotes first piston and to turn right motion; Because hydraulic pump is unloaded, the hydraulic oil now on the right side of oil cylinder body is back to fuel tank by pipeline.
In injection stage, when the fluid in runner reaches scheduled volume, now first piston touches the first travel switch, first travel switch passes the signal to controller, controller sends signal to hydraulic pump, hydraulic pump is started working, hydraulic pressure is first through overflow valve, the hydraulic pressure entering piston is made to be level pressure, level pressure hydraulic drive hydraulic stem, hydraulic stem so promote first piston by hydraulic pressure transfer to the fluid in runner, high-pressure fluid enters into pressure chamber by pod apertures, high-pressure fluid in pressure chamber produces a downward pressure to spool, this pressure can overcome spring force suffered by spool and frictional force, spool moves downward the position of limited post, now, runner is opened completely, high-pressure fluid is spouting by nozzle.
Go out along with Fluid injection, first piston and hydraulic stem continue to left movement, when the fluid in runner is about to be drained, piston I moves to high order end, touching block on hydraulic stem also touches the second travel switch, and touching switch is by Signal transmissions to controller, and controller hydraulic control pump quits work, hydraulic system does not provide pressure, fluid in runner becomes normal pressure, and now, spool moves upward to topmost under spring force, block fluid course again, complete circulation.
Because the second piston end surface area is greater than the area of first piston end face, the pressure that fluid produces is greater than the pressure of hydraulic system, like this, creates a pressure enlarge-effect, increases expulsion pressure and the jet velocity of nozzle.
This injection apparatus have not timing, quantitatively, constant pressure injection function, be especially applicable to when feed liquor mass flow discrepancy is even, and spray need quantitatively, level pressure time, applicable fluid media (medium) is that viscosity is lower, in runner, not easily produce the liquid solidified.
Below only just preferred embodiment of the present invention is described, but can not be interpreted as it is limitations on claims.The present invention is not only confined to above embodiment, and its concrete structure allows to change.In a word, all various changes done in the protection domain of independent claims of the present invention are all in protection scope of the present invention.
Claims (5)
1. a Non-return quantitative constant-pressure injection device, comprise nozzle body (1), spool mechanism, injection cylinder, hydraulic system (2) and controller (3), described nozzle body (1) offers runner (4) and inlet (5), the spool mechanism opened or closed in order to nozzle body (1) is arranged in nozzle body (1), described injection cylinder comprises oil cylinder body (6) and is provided with the hydraulic stem (8) of first piston (7) in leading section, the described hydraulic stem with first piston (7) (8) stretches in the runner (4) of nozzle body (1), described hydraulic system (2) is connected for driving injection cylinder with oil cylinder body (6), it is characterized in that: described injection device also comprises hydraulic stem travel control device, described hydraulic system (2) and hydraulic stem travel control device are all electrically connected with controller (3),
Described spool mechanism comprises main valve plug (9) and spring (10), on described nozzle body (1), runner (4) radial direction extends to form valve core channel (11), described spring (10) one end is fixed on valve core channel (11), the other end is connected on main valve plug (9), the left side of main valve plug (9) is the conical surface, contact as linear contact lay with nozzle body (1), the direction of motion of main valve plug (9) is positioned in the radial direction of runner (4), nozzle body (1) inwall relative with valve core channel (11) arranges interior pressure chamber (12), main valve plug (9) arranges pod apertures (13), described pod apertures (13) comprises radial section and Connectivity Section, described radial section communicates with interior pressure chamber (12), described Connectivity Section communicates with runner (4), the pressure of spring (10) be greater than injection cylinder unloaded time first piston (7) resistance.
2. Non-return quantitative constant-pressure injection device according to claim 1, it is characterized in that: described interior pressure chamber (12) is the little stepped cavity of outer imperial palace, the end area of main valve plug (9) is greater than stepped cavity osculum size and is less than the large mouth size of stepped cavity, and under spring (10) effect, main valve plug (9) end props up the cascaded surface between the large mouth of stepped cavity and osculum.
3. Non-return quantitative constant-pressure injection device according to claim 1, is characterized in that: described Connectivity Section tilts to be communicated with on radial section from top to bottom, and the one end be communicated with radial section is upper end.
4. Non-return quantitative constant-pressure injection device according to claim 1, it is characterized in that: described hydraulic stem travel control device comprises the first travel switch (14) and the second travel switch (15), described the first travel switch (14) is arranged in nozzle body (1), and be positioned at the rear side of first piston (7), described second travel switch (15) is arranged between nozzle body (1) and oil cylinder body (6), and on hydraulic stem (8), be provided with the touching block (16) matched with the second travel switch (15), in hydraulic stem (8) traveling process, touch block (16) the second travel switch (15) can be touched.
5. Non-return quantitative constant-pressure injection device according to claim 1, it is characterized in that: described injection device also comprises overflow valve (17), described overflow valve (17) is connected with hydraulic system (2), and is positioned at hydraulic system (2) on the pipeline of oil cylinder body (6) feed flow.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753456.0A CN103722702B (en) | 2013-12-27 | 2013-12-27 | Non-return quantitative constant-pressure injection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753456.0A CN103722702B (en) | 2013-12-27 | 2013-12-27 | Non-return quantitative constant-pressure injection device |
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| CN103722702A CN103722702A (en) | 2014-04-16 |
| CN103722702B true CN103722702B (en) | 2015-11-25 |
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| CN203805265U (en) * | 2013-12-27 | 2014-09-03 | 中国计量学院 | Non-return quantitative constant-pressure injector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI571306B (en) * | 2016-04-26 | 2017-02-21 | Liquid microinjection device |
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Effective date of registration: 20170829 Address after: 528000 Guangdong city in Foshan province two loop Xingtan town Shunde District No. 8 Shunde Chi Fuyuan Building 101 2 Patentee after: FOSHAN YUNXIONG PLASTIC HARDWARE PRODUCTS CO.,LTD. Address before: 1 A226 room, No. nine, 9 Ring Road, Zhejiang, Jianggan District 310016, China Patentee before: ZHEJIANG WEIZHI ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Effective date of registration: 20170829 Address after: 1 A226 room, No. nine, 9 Ring Road, Jianggan District, Zhejiang, Hangzhou 310016, China Patentee after: ZHEJIANG WEIZHI ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: 315470, No. 258, Yuen Xue street, Xiasha, Zhejiang, Hangzhou Patentee before: China Jiliang University |
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