CN103727295B - For the emergency hydraulic manual operation module of gas-liquid linkage actuator - Google Patents

For the emergency hydraulic manual operation module of gas-liquid linkage actuator Download PDF

Info

Publication number
CN103727295B
CN103727295B CN201410032673.5A CN201410032673A CN103727295B CN 103727295 B CN103727295 B CN 103727295B CN 201410032673 A CN201410032673 A CN 201410032673A CN 103727295 B CN103727295 B CN 103727295B
Authority
CN
China
Prior art keywords
fluid port
hydraulic fluid
hydraulic
gas
hand pump
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
Application number
CN201410032673.5A
Other languages
Chinese (zh)
Other versions
CN103727295A (en
Inventor
黄乐敏
房保平
李锦硕
曹永明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TEFULONG (SHANGHAI) TECHNOLOGY CO., LTD.
Original Assignee
TEFULONG (SHANGHAI) TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TEFULONG (SHANGHAI) TECHNOLOGY Co Ltd filed Critical TEFULONG (SHANGHAI) TECHNOLOGY Co Ltd
Priority to CN201410032673.5A priority Critical patent/CN103727295B/en
Publication of CN103727295A publication Critical patent/CN103727295A/en
Application granted granted Critical
Publication of CN103727295B publication Critical patent/CN103727295B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/12Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/14Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves
    • F16K31/143Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves the fluid acting on a piston

Abstract

The invention discloses a kind of emergency hydraulic manual operation module for gas-liquid linkage actuator, this emergency hydraulic manual operation module includes hand pump and four six logical hydraulic reversing valves, described four six logical hydraulic reversing valves have four kinds of valve position: valve position, hand pump close valve position, hand pump valve opening position and conducting valve position automatically, wherein, under automatic valve position, T hydraulic fluid port and P hydraulic fluid port are closed, P ahydraulic fluid port is communicated with A hydraulic fluid port, T bhydraulic fluid port communicates with B hydraulic fluid port; Under hand pump valve opening position, P hydraulic fluid port is communicated with A hydraulic fluid port, T hydraulic fluid port and P ahydraulic fluid port is communicated with, B hydraulic fluid port and T bhydraulic fluid port communicates; Under hand pump closes valve position, P hydraulic fluid port is communicated with B hydraulic fluid port, T mouth and T bhydraulic fluid port connection, A hydraulic fluid port and P ahydraulic fluid port communicates; Under conducting valve position, P hydraulic fluid port, T hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port are all closed, P ahydraulic fluid port and T bhydraulic fluid port communicates.The present invention can realize high voltage power gas break down cannot supply time, with emergent manually-operable, to make final controlling element open or throttle down, and then ensure the normal operation of pipeline and safety, and can conducting A, B gas-liquid tank, to make hydraulic oil level height consistent.

Description

For the emergency hydraulic manual operation module of gas-liquid linkage actuator
Technical field
The present invention relates to a kind of emergency hydraulic manual operation module for gas-liquid linkage actuator.
Background technique
When gas-liquid linkage actuator normally works, be converted into hydraulic oil power source promotion hydraulic cylinder piston by the pressure of high voltage power gas to order about final controlling element unlatching or throttle down.Gas-liquid linkage actuator is equipped with A, B two gas-liquid tanks (hereinafter referred to as A tank, B tank) usually.During normal operation, employing is filled with A tank or the hydraulic oil press-in Hydraulic Cylinder piston in tank is ordered about final controlling element unlatching or throttle down by B tank high voltage power gas.This control mode, in some urgencies, cannot supply as high voltage power gas breaks down, and makes final controlling element to carry out proper operation, there is serious potential safety hazard.
Summary of the invention
The object of the invention is the shortcoming and defect existed to overcome prior art, and a kind of manually-operable of meeting an urgent need when not having high voltage power gas is provided, to make final controlling element open or throttle down, and then ensure the emergency hydraulic manual operation module for gas-liquid linkage actuator of pipeline safety.
For achieving the above object, technological scheme of the present invention is that gas-liquid linkage actuator comprises A gas-liquid tank, B gas-liquid tank and oil hydraulic cylinder, oil hydraulic cylinder comprises rod chamber and rodless cavity, this emergency hydraulic manual operation module comprises logical hydraulic reversing valves of hand pump and four six and integrated, and these four six logical hydraulic reversing valves are provided with: for the P communicated with A gas-liquid tank ahydraulic fluid port, T for communicating with B gas-liquid tank bhydraulic fluid port, the A hydraulic fluid port for communicating with the rodless cavity of oil hydraulic cylinder, B hydraulic fluid port for communicating with the rod chamber of oil hydraulic cylinder, and for P hydraulic fluid port that the T hydraulic fluid port that communicates with described hand pump suction passage and hand pump oil discharge passage communicate, described four six logical hydraulic reversing valves have four kinds of valve position: valve position, hand pump close valve position, hand pump valve opening position and conducting valve position automatically, wherein, under automatic valve position, T hydraulic fluid port and P hydraulic fluid port are closed, P ahydraulic fluid port is communicated with A hydraulic fluid port, T bhydraulic fluid port communicates with B hydraulic fluid port; Under hand pump valve opening position, P hydraulic fluid port is communicated with A hydraulic fluid port, T hydraulic fluid port and P ahydraulic fluid port is communicated with, B hydraulic fluid port and T bhydraulic fluid port communicates; Under hand pump closes valve position, P hydraulic fluid port is communicated with B hydraulic fluid port, T hydraulic fluid port and T bhydraulic fluid port connection, A hydraulic fluid port and P ahydraulic fluid port communicates; Under conducting valve position, P hydraulic fluid port, T hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port are all closed, P ahydraulic fluid port and T bhydraulic fluid port communicates.
Further setting is that four six logical hydraulic reversing valves include spool, valve gap, valve seat and rotary valve operating grip, and described valve seat is cylindrical end face, it is respectively equipped with and leads to hand pump oil discharge passage, the P hydraulic fluid port of hand pump oil suction oil duct and T hydraulic fluid port; And lead to the P of A, B two gas-liquid tanks a, T bhydraulic fluid port, A, B hydraulic fluid port towards oil hydraulic cylinder rodless cavity and rod chamber.
The cylindrical structural of further setting to be described spool and valve seat be same diameter, the end face of spool has not connected and differ in size five water conservancy diversion oil ducts.
Further setting is the pressure balance pod apertures that described valve gap is provided with multiple tracks and communicates with water conservancy diversion oil duct.
Working principle of the present invention is: the four-way of emergency hydraulic manual operation module controls four valve position that rotary valve controls and is divided into " automatically ", "ON", "Off" and " conducting ", and its function is respectively:
" automatic valve position ", when gas-liquid linkage actuator is normally run, can four the six logical valve position controlling rotary valve locking, T inlet port and P oil outlet are closed, P ahydraulic fluid port is communicated with A hydraulic fluid port, T bhydraulic fluid port communicates with B hydraulic fluid port, this valve position, and hand pump is failure to actuate; Be filled with A hydraulic tank high voltage power gas and the rodless cavity promotion hydraulic cylinder piston of the hydraulic oil press-in oil hydraulic cylinder in its tank is ordered about final controlling element throttle down, and the hydraulic oil of oil hydraulic cylinder rod chamber is back to B tank.Otherwise, also can be filled with B gas-liquid tank high voltage power gas and the rod chamber promotion hydraulic cylinder piston of the hydraulic oil press-in oil hydraulic cylinder in its tank is ordered about final controlling element Open valve, and the hydraulic oil of oil hydraulic cylinder rodless cavity is back to A gas-liquid tank.
" hand pump valve opening position ", emergency operation four six is logical when controlling rotary valve to the valve position of "ON", and P hydraulic fluid port is communicated with A hydraulic fluid port, T hydraulic fluid port and P ahydraulic fluid port is communicated with, B hydraulic fluid port and T bhydraulic fluid port communicates, and the rodless cavity promotion hydraulic cylinder piston that the hydraulic oil in A gas-liquid tank can be pumped into oil hydraulic cylinder by operation hand pump orders about final controlling element Open valve, and the hydraulic oil of oil hydraulic cylinder rod chamber is back to B gas-liquid tank.This valve position, the high voltage power gas just can tackled once A gas-liquid tank breaks down and cannot supply, and can also realize the effect of final controlling element Open valve, ensure the safety of pipeline.
" hand pump pass valve position ", emergency operation four six is logical when controlling rotary valve to the valve position of "Off", and P hydraulic fluid port is communicated with B hydraulic fluid port, T hydraulic fluid port and T bhydraulic fluid port connection, A hydraulic fluid port and P ahydraulic fluid port communicates, and the rod chamber promotion hydraulic cylinder piston that the hydraulic oil in B gas-liquid tank can be pumped into oil hydraulic cylinder by operation hand pump orders about final controlling element throttle down, and the hydraulic oil of the rodless cavity of oil hydraulic cylinder is back to A tank.This valve position, the high voltage power gas just can tackled once B gas-liquid tank breaks down and cannot supply, and can also realize the effect of final controlling element throttle down, ensure normal operation and the safety of pipeline.
" conducting valve position ", operate four six logical when controlling rotary valves to the valve position of " conducting ", P oil outlet, T inlet port, A hydraulic fluid port and B hydraulic fluid port are all closed, P ahydraulic fluid port and T bhydraulic fluid port communicates, i.e. A gas-liquid tank, the conducting of B gas-liquid tank, and balance A, B two hydraulic oil level height of tank are consistent.
In sum, the present invention can realize high voltage power gas break down cannot supply time, with emergent manually-operable, open or throttle down to make final controlling element, and then ensure the normal operation of pipeline and safety, and can conducting A, B gas-liquid tank, to make hydraulic oil level height consistent.
Below in conjunction with specification drawings and specific embodiments, the present invention is described further.
Accompanying drawing explanation
The hydraulic schematic diagram of Fig. 1 specific embodiment of the invention;
Fig. 2 structural representation of the present invention;
Fig. 3 is the right elevation of integrated package;
Fig. 4 is the left view of integrated package;
Fig. 5 is integrated package A-A sectional view;
The spool schematic diagram of the rotary valve of Fig. 6 embodiment;
Fig. 7 is the plan view of spool;
Fig. 8 is four six logical " automatic valve position " phase diagrams controlling rotary valve.
Embodiment
Below by embodiment, the present invention is specifically described; only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the present invention, the technician in this field can make some nonessential improvement and adjustment according to the content of foregoing invention to the present invention.
The specific embodiment of the present invention as shown in Figure 1, gas-liquid linkage actuator comprises A gas-liquid tank 11, B gas-liquid tank 12 and oil hydraulic cylinder 13, oil hydraulic cylinder 13 comprises rod chamber 131 and rodless cavity 132, gas-liquid linkage actuator also includes the actuator 14 by the piston actuated of oil hydraulic cylinder, this emergency hydraulic manual operation module includes hand pump 2 and four six logical hydraulic reversing valves 3, and these four six logical hydraulic reversing valves 3 are provided with: for the P communicated with A gas-liquid tank ahydraulic fluid port, T for communicating with B gas-liquid tank bhydraulic fluid port, the A hydraulic fluid port for communicating with the rodless cavity of oil hydraulic cylinder, B hydraulic fluid port for communicating with the rod chamber of oil hydraulic cylinder, and for P hydraulic fluid port that the T hydraulic fluid port that communicates with described hand pump suction passage and hand pump oil discharge passage communicate.Described four six logical hydraulic reversing valves have four kinds of valve position: valve position, hand pump valve opening position, hand pump close valve position and conducting valve position automatically, and wherein, under automatic valve position, T hydraulic fluid port and P hydraulic fluid port are closed, P ahydraulic fluid port is communicated with A hydraulic fluid port, T bhydraulic fluid port communicates with B hydraulic fluid port; Under hand pump valve opening position, P hydraulic fluid port is communicated with A hydraulic fluid port, T hydraulic fluid port and P ahydraulic fluid port is communicated with, B hydraulic fluid port and T bhydraulic fluid port communicates; Under hand pump closes valve position, P mouth is communicated with B hydraulic fluid port, T mouth and T bhydraulic fluid port connection, A hydraulic fluid port and P ahydraulic fluid port communicates; Under conducting valve position, P hydraulic fluid port, T hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port are all closed, P ahydraulic fluid port and T bhydraulic fluid port communicates.
As shown in Figure 2, the emergency hydraulic manual operation module described in the present embodiment includes integrated package 24, integrated package 24 end face is installed and is supported with hand pump operating grip 21 and hand pump pump seat 22 thereof; Described hand pump operation assembling parts is positioned at integrated package 24 in hand pump base 22, hand pump suction passage 25 and hand pump oil discharge passage 26;
As shown in figures 3-8, integrated package 24 left and right side is provided with the oil hydraulic cylinder rodless cavity 132 of connection and A hydraulic fluid port, the B hydraulic fluid port of rod chamber 131; Bottom surface is provided with the P connecting A, B two gas-liquid tanks ahydraulic fluid port, T bhydraulic fluid port; Be provided with the spool 31 of four six logical hydraulic reversing valves, valve gap 32, valve seat 34 and rotary valve operating grip 33 etc. above, this valve gap is arranged the locking aperture 331 of corresponding rotary valve operating grip 33, integrated package 4 is provided with four screws 41 installed and support integrated package below.The spool 31 of rotary valve, valve gap 32, assembly relation between valve seat 34 and rotary valve operating grip 33 are the notice general knowledge in rotary valve field, and the present embodiment is no longer described in detail.
The spool 3 of the rotary valve described in the present embodiment is integrated on integrated package, and the valve seat 34 of this rotary valve is cylindrical end face, is respectively equipped with and leads to integrated package built-in hand-operated pump oil discharge passage 26, P, T hydraulic fluid port of hand pump suction passage 25 and the P towards A, B two gas-liquid tanks a, T bhydraulic fluid port, A, B hydraulic fluid port towards oil hydraulic cylinder rodless cavity and rod chamber.The spool 31 of four six logical hydraulic reversing valves is the cylindrical of a nominal size and the same diameter of rotary valve valve seat, columniform spool 31 end face has five not connected water conservancy diversion oil ducts 311, arrange water conservancy diversion oil duct to vary in size, to mate with gas-liquid linkage actuator operating conditions, namely four six logical hydraulic reversing valves are when " automatically " valve position locks, flow is maximum, therefore, can realize and meet four six logical hydraulic reversing valves completely in " automatically ", "ON", the functional requirement of "Off" and " conducting " four valve position, and the radial and axial sealing of multiple tracks and pressure balance pod apertures 312 is provided with on the valve gap of four six logical hydraulic reversing valves.
Valve position locks, and when four six logical hydraulic reversing valves are positioned at " automatically " valve position, rotary valve operating grip padlockable locks, and all can not insert in other three valve position, to guarantee to avoid misoperation occurs, as shown in Figure 2.

Claims (4)

1. the emergency hydraulic manual operation module for gas-liquid linkage actuator, gas-liquid linkage actuator critical piece comprises A gas-liquid tank, B gas-liquid tank and oil hydraulic cylinder, oil hydraulic cylinder form is single-piston-rod hydraulic cylinder, the feature of emergency hydraulic manual operation module is: comprise hand pump and four six logical hydraulic reversing valves, these four six logical hydraulic reversing valves are provided with: for the P communicated with A gas-liquid tank ahydraulic fluid port, T for communicating with B gas-liquid tank bhydraulic fluid port, for the A hydraulic fluid port that communicates with the rodless cavity of oil hydraulic cylinder and the B hydraulic fluid port for communicating with the rod chamber of oil hydraulic cylinder, and for P hydraulic fluid port that the T hydraulic fluid port that communicates with described hand pump suction passage and hand pump oil discharge passage communicate, described four six logical hydraulic reversing valves are provided with four kinds of valve position mutually switched: valve position, hand pump close valve position, hand pump valve opening position and conducting valve position automatically, wherein, under automatic valve position, T hydraulic fluid port and P hydraulic fluid port are closed, P ahydraulic fluid port is communicated with A hydraulic fluid port, T bhydraulic fluid port communicates with B hydraulic fluid port; Under hand pump closes valve position, P hydraulic fluid port is communicated with A hydraulic fluid port, T hydraulic fluid port and P ahydraulic fluid port is communicated with, B hydraulic fluid port and T bhydraulic fluid port communicates; Under hand pump valve opening position, P hydraulic fluid port is communicated with B hydraulic fluid port, T hydraulic fluid port and T bhydraulic fluid port connection, A hydraulic fluid port and P ahydraulic fluid port communicates; Under conducting valve position, P hydraulic fluid port, T hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port are all closed, P ahydraulic fluid port and T bhydraulic fluid port communicates.
2. a kind of emergency hydraulic manual operation module for gas-liquid linkage actuator according to claim 1, it is characterized in that: four six logical hydraulic reversing valves include spool, valve gap, valve seat and rotary valve operating grip, described valve seat is cylindrical end face, it is respectively equipped with and leads to hand pump oil discharge passage, the P hydraulic fluid port of hand pump oil suction oil duct and T hydraulic fluid port; And lead to the P of A, B two gas-liquid tanks a, T bhydraulic fluid port, A, B hydraulic fluid port towards oil hydraulic cylinder rodless cavity and rod chamber.
3. a kind of emergency hydraulic manual operation module for gas-liquid linkage actuator according to claim 2, it is characterized in that: described spool and valve seat are the cylindrical structural of same diameter, the end face of spool has not connected and differ in size five water conservancy diversion oil ducts.
4. a kind of emergency hydraulic manual operation module for gas-liquid linkage actuator according to claim 2, is characterized in that: described valve gap is provided with the pressure balance pod apertures that multiple tracks communicates with water conservancy diversion oil duct.
CN201410032673.5A 2014-01-23 2014-01-23 For the emergency hydraulic manual operation module of gas-liquid linkage actuator Active CN103727295B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410032673.5A CN103727295B (en) 2014-01-23 2014-01-23 For the emergency hydraulic manual operation module of gas-liquid linkage actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410032673.5A CN103727295B (en) 2014-01-23 2014-01-23 For the emergency hydraulic manual operation module of gas-liquid linkage actuator

Publications (2)

Publication Number Publication Date
CN103727295A CN103727295A (en) 2014-04-16
CN103727295B true CN103727295B (en) 2015-12-02

Family

ID=50451509

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410032673.5A Active CN103727295B (en) 2014-01-23 2014-01-23 For the emergency hydraulic manual operation module of gas-liquid linkage actuator

Country Status (1)

Country Link
CN (1) CN103727295B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2505632Y (en) * 2001-04-29 2002-08-14 山东工程机械厂 Pilot-controlled multi-way reversing valve
CN2615367Y (en) * 2003-01-22 2004-05-12 扬州威斯特机电有限公司 Hand-operated pump
CN2692393Y (en) * 2004-01-18 2005-04-13 刘建 Manual electric dual purpase hydraulic driving device
CN102678678A (en) * 2012-05-29 2012-09-19 特福隆集团有限公司 Hydraulic emergency operation module
CN203686316U (en) * 2014-01-23 2014-07-02 特福隆集团有限公司 Emergency hydraulic manual operation module for pneumatic and hydraulic linkage actuator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050005475A1 (en) * 2003-07-09 2005-01-13 Vanamburg Darryl Michael Hoverman

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2505632Y (en) * 2001-04-29 2002-08-14 山东工程机械厂 Pilot-controlled multi-way reversing valve
CN2615367Y (en) * 2003-01-22 2004-05-12 扬州威斯特机电有限公司 Hand-operated pump
CN2692393Y (en) * 2004-01-18 2005-04-13 刘建 Manual electric dual purpase hydraulic driving device
CN102678678A (en) * 2012-05-29 2012-09-19 特福隆集团有限公司 Hydraulic emergency operation module
CN203686316U (en) * 2014-01-23 2014-07-02 特福隆集团有限公司 Emergency hydraulic manual operation module for pneumatic and hydraulic linkage actuator

Also Published As

Publication number Publication date
CN103727295A (en) 2014-04-16

Similar Documents

Publication Publication Date Title
CA2560318A1 (en) Valve, actuator and control system therefor
CN106678405B (en) high pressure self-closing valve
CN102549273A (en) Electro-hydraulic controller
CN203686316U (en) Emergency hydraulic manual operation module for pneumatic and hydraulic linkage actuator
CN104265716A (en) Ultrahigh pressure pilot operated relief valve
US10571040B2 (en) Irrigation valve with three-way solenoid actuation train
CN204344557U (en) A kind of ultrahigh pressure pilot operated compound relief valve
US20190264714A1 (en) Electro-hydraulic valve actuator having modular manifold with configurable redundancy
CN103615213A (en) Multi-well control valve for hydraulic drive well mouth safety control system
CN103727295B (en) For the emergency hydraulic manual operation module of gas-liquid linkage actuator
CN204628758U (en) Manual down-mounting type cylinder
CN102966775B (en) Direct-current piston type emergency shutoff valve and application thereof
CN106763934B (en) Double-drive quick-closing lifting type non-return and stop combined valve
CN104963905A (en) Two-stage overflow unloading valve
CN108869436A (en) A kind of oil distributing valve
CN204042151U (en) A kind of speed closes stop valve
CN203614487U (en) Hydraulic control one-way valve
CN207935450U (en) Bevel seat type 2/2-way solenoid valve
CN202945636U (en) Hydraulic system of loading machine with floating function
CN105370927A (en) Hydraulically-controlled one-way valve
CN108331795A (en) The multi-way valve of floating connection gas control mechanism
CN204704186U (en) Twin-stage overflow unloading valve
CN208442097U (en) Mine car multiple directional control valve
CN103277550B (en) Pilot-operated type relief valve
CN204371815U (en) large electric wheel self-discharging vehicle stair hydraulic control integrated system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: TEFULONG (SHANGHAI) TECHNOLOGY CO., LTD.

Free format text: FORMER OWNER: TEFULONG GROUP CO., LTD.

Effective date: 20140828

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 325000 WENZHOU, ZHEJIANG PROVINCE TO: 200120 PUDONG NEW AREA, SHANGHAI

TA01 Transfer of patent application right

Effective date of registration: 20140828

Address after: 200120 room 12, No. 600, South Xinyuan Road, mud town, Shanghai, Pudong New Area, 401

Applicant after: TEFULONG (SHANGHAI) TECHNOLOGY CO., LTD.

Address before: 325000, No. 66, Gao Lu, Longwan District, Wenzhou District, Zhejiang, China

Applicant before: Tefulong Group Co., Ltd.

C14 Grant of patent or utility model
GR01 Patent grant