CN220957910U - Quick butt joint clamping suction mechanism for inner tube valve - Google Patents

Quick butt joint clamping suction mechanism for inner tube valve Download PDF

Info

Publication number
CN220957910U
CN220957910U CN202322599607.3U CN202322599607U CN220957910U CN 220957910 U CN220957910 U CN 220957910U CN 202322599607 U CN202322599607 U CN 202322599607U CN 220957910 U CN220957910 U CN 220957910U
Authority
CN
China
Prior art keywords
inner tube
butt joint
programmable logic
logic controller
air
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
CN202322599607.3U
Other languages
Chinese (zh)
Inventor
刘常进
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.)
Qingdao Haifeng Automation Equipment Co ltd
Original Assignee
Qingdao Haifeng Automation Equipment 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 Qingdao Haifeng Automation Equipment Co ltd filed Critical Qingdao Haifeng Automation Equipment Co ltd
Priority to CN202322599607.3U priority Critical patent/CN220957910U/en
Application granted granted Critical
Publication of CN220957910U publication Critical patent/CN220957910U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Manipulator (AREA)

Abstract

The utility model provides a rapid butt joint clamping suction mechanism for an inner tube valve, which comprises a spring, an electromagnet, a movable iron core and a butt joint valve, wherein the front end surface of a suction clamp is provided with the butt joint valve, the rear end surface of the butt joint valve is connected with the movable iron core, the spring is clamped at the rear side inside the movable iron core, the electromagnet is embedded at the rear side inside the suction clamp, and an electric signal micro switch is arranged at the rear side of the electromagnet.

Description

Quick butt joint clamping suction mechanism for inner tube valve
Technical Field
The utility model relates to the technical field of manufacturing of inner tubes of electric bicycles, in particular to a rapid butt joint clamping suction mechanism of an inner tube valve.
Background
In the production and manufacturing process of the inner tube of the electric bicycle, inflation inspection is required to be carried out on the finished inner tube, and after inflation quality inspection is completed, the inner tube is required to be pumped out of gas and packed for storage.
The suction nozzle in the prior art is manually in butt joint and is kept, an operator is required to pinch the inner tube valve hard to insert the inner tube valve into the suction nozzle, the long-time frequent operation not only increases the labor intensity of the operator, but also easily causes the finger deformity of the operator due to the long-time finger pinching force, and the life safety of the operator is greatly damaged.
Disclosure of utility model
The utility model aims to provide a rapid butt joint clamping suction mechanism for an inner tube valve, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
The utility model provides a tight mechanism of inhaling of quick butt joint clamp of inner tube valve mouth, includes case, programmable logic controller, access door, suction clamp and movable castor, the access door is installed to the terminal surface before the case, the terminal surface upside is provided with programmable logic controller before the access door, movable castor is installed to the case bottom, the suction clamp is installed in the case place ahead, the inside downside of case is provided with the subassembly of inhaling that is used for carrying out the evacuation to external inner tube, the inside subassembly that connects that is used for carrying out quick butt joint to external inner tube valve mouth that is provided with of suction clamp.
Preferably, the quick-connection assembly comprises an air pipe joint, a spring, an electric signal micro switch, an electromagnet, a movable iron core and a butt joint nozzle, the lower end surface of the air suction clamp is provided with the air pipe joint, the front end surface of the air suction clamp is provided with the butt joint nozzle, the rear end surface of the butt joint nozzle is connected with the movable iron core, the spring is clamped on the rear side inside the movable iron core, the electromagnet is embedded on the rear side inside the air suction clamp and is connected with a programmable logic controller through an external relay, the electric signal micro switch is arranged on the rear side of the electromagnet, and the electric signal micro switch is connected with the programmable logic controller through a signal.
Preferably, the air suction assembly comprises an air suction pipe, an electromagnetic valve, a vacuum tank and an electric air suction pump, the air suction pipe is sleeved on the annular side face of the air pipe joint, the vacuum tank is installed on the lower side inside the box shell, the electric air suction pump is installed at the air outlet end of the vacuum tank, the electric air suction pump is connected with the programmable logic controller through an external relay in a signal mode, the electromagnetic valve is installed between the air inlet end of the vacuum tank and the air suction pipe, and the electromagnetic valve is connected with the programmable logic controller in a signal mode.
Preferably, the front side of the annular side of the butt joint mouth is sleeved with a mouth clamping jaw, the rear side of the inside of the butt joint mouth is provided with a butt joint sealing rubber cushion, and the front end face of the air suction clamp is clamped with a mouth sleeve.
Preferably, the movable iron core is internally provided with an air guide inner core, the air guide inner core is respectively communicated with the butt joint nozzle and the air pipe joint, and the rear end surface of the movable iron core is provided with a pressing contact.
Preferably, an intelligent digital pressure gauge is arranged on the upper end face of the vacuum tank, the intelligent digital pressure gauge is connected with the programmable logic controller in a signal mode, and the air suction pipe is made of a pressure-resistant hose.
Preferably, the protection end cover is installed to the terminal surface behind the anchor clamps of breathing in, the circuit protecting crust is installed to terminal surface rear side under the anchor clamps of breathing in, the access door possesses the ability of swinging up and down and opening and shutting, the terminal surface is provided with the touch-sensitive screen before the programmable logic controller.
Compared with the prior art, the utility model has the beneficial effects that:
1. The electric signal micro switch is used for controlling the electromagnet to be electrified through the external relay after the programmable logic controller receives the electric signal sent by the electric signal micro switch, so that the electromagnet adsorbs the movable iron core, the movable iron core can drive the butt joint nozzle to move backwards further in the adsorption process so that the butt joint nozzle clamps and fixes the external inner tube valve further, and when the programmable logic controller cuts off the power of the electromagnet through the external relay, the movable iron core drives the butt joint nozzle to move forwards under the extrusion force of the spring, so that the clamping force of the butt joint nozzle disappears, an operator can take away the sucked external inner tube valve, the external inner tube valve is quickly butted, and the operator is not required to pinch and hold the external inner tube valve all the time by hand in the use process, so that the labor intensity of the operator is greatly reduced;
2. The utility model is characterized in that the programmable logic controller controls the electric suction pump to work through the external relay, so that the electric suction pump sucks the vacuum tank, then the programmable logic controller controls the electromagnetic valve to be opened and the electric suction pump to be closed through the external relay, at the moment, the negative pressure of the vacuum tank can suck air to the air suction clamp through the air suction pipe, so that the air suction clamp sucks air to dry the outer inner tube, and the air suction efficiency of the outer inner tube is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the main structure of the present utility model;
FIG. 2 is a right side cross-sectional view of the aspirator assembly of the present utility model;
FIG. 3 is a right side cross-sectional view of the quick connect assembly of the present utility model;
fig. 4 is a schematic block diagram of the circuit of the present utility model.
In the figure: 1. a case shell; 2. a programmable logic controller; 3. an access door; 4. a suction assembly; 41. an air suction pipe; 42. an electromagnetic valve; 43. a vacuum tank; 44. an electric getter pump; 45. an intelligent digital pressure gauge; 5. a suction jig; 51. a line protective housing; 52. a protective end cap; 6. a quick-connect assembly; 61. an air pipe joint; 62. a spring; 63. an electrical signal microswitch; 64. an electromagnet; 65. a movable iron core; 651. pressing the contact; 66. an air guide inner core; 67. butting a sealing rubber cushion; 68. a butt joint nozzle; 681. a mouth sleeve; 69. clamping mouth clamping jaws; 7. the caster is moved.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-4, the present utility model provides a technical solution:
Embodiment one:
The utility model provides a tight air suction mechanism of quick butt joint clamp of inner tube valve mouth, including case 1, programmable logic controller 2, access door 3, suction clamp 5 and movable castor 7, access door 3 is installed to case 1 front end face, access door 3 possesses can swing from top to bottom and opens and shuts the ability, but access door 3 of ability is opened and shut in the swing from top to bottom is convenient for the operating personnel later stage to carry out maintenance to the inside subassembly 4 that breathes in of case 1, access door 3 front end face upside is provided with programmable logic controller 2, programmable logic controller 2 has microprocessor's digital operation controller that is used for automated control, can load control command at any time into the memory and store and carry out, so that automatic control solenoid valve 42, electro-magnet 64 and electronic suction pump 44 work, because programmable logic controller 2's theory of operation and inside detail structure belong to the comparatively mature technique in the prior art, so do not make excessive description here, programmable logic controller 2 front end face is provided with the touch-sensitive screen, the touch-sensitive screen can replace traditional button, make things convenient for operating personnel to input appointed control command to programmable logic controller 2 by hand.
The movable castor 7 is installed to case 1 bottom, movable castor 7 makes things convenient for operating personnel to shift case 1, case 1 the place ahead is installed and is inhaled anchor clamps 5, and the specification such as anchor clamps 5 breathe in installs a plurality ofly, the anchor clamps 5 of breathing in conveniently breathe in external inner tube inflating valve, protection end cover 52 is installed to anchor clamps 5 rear end face of breathing in, protection end cover 52 can protect anchor clamps 5 rear end face of breathing in, circuit protection shell 51 is installed to anchor clamps 5 lower terminal surface rear side of breathing in, circuit protection shell 51 can protect the wire that gets into the anchor clamps 5 inside of breathing in, the inside downside of case 1 is provided with the subassembly 4 of breathing in that is used for exhausting to external inner tube, the inside subassembly 6 that connects that is used for carrying out quick butt joint to external inner tube inflating valve that is provided with of anchor clamps of breathing in.
The air suction assembly 4 comprises an air suction pipe 41, an electromagnetic valve 42, a vacuum tank 43 and an electric air suction pump 44, the air suction pipe 41 is sleeved on the annular side surface of the air pipe connector 61, a plurality of air suction pipes 41 are sleeved on the annular side surface of the air pipe connector 61, the air suction pipe 41 is made of a pressure-resistant hose, the electromagnetic valve 42 is convenient to be communicated with the air suction clamp 5 by the aid of the air suction pipe 41 made of the pressure-resistant hose, the pressure resistance and the service life are good, the vacuum tank 43 is mounted on the lower side inside the box shell 1, and certain negative pressure can be stored in the vacuum tank 43 so that the air suction pipe 41 can be sucked when the electromagnetic valve 42 is opened.
An electric suction pump 44 is installed at the air outlet end of the vacuum tank 43, the electric suction pump 44 is in signal connection with the programmable logic controller 2 through an external relay (the external relay is located in the case 1 and is not shown in the figure), the diaphragm in the pump can be made to reciprocate through a mechanical device by the electric suction pump 44, so that air in a pump cavity with a fixed volume is compressed and stretched to form vacuum (negative pressure) in the vacuum tank 43, an electromagnetic valve 42 is installed between the air inlet end of the vacuum tank 43 and the air suction pipe 41, the electromagnetic valve 42 is in signal connection with the programmable logic controller 2, the electromagnetic valve 42 is communicated with the air suction pipe 41 and the vacuum tank 43, the electromagnetic valve 42 is convenient for the programmable logic controller 2 to control on-off between the air suction pipe 41 and the vacuum tank 43, an intelligent digital pressure gauge 45 is installed at the upper end face of the vacuum tank 43, and the intelligent digital pressure gauge 45 is in signal connection with the programmable logic controller 2, the intelligent digital pressure gauge 45 can monitor the internal pressure of the vacuum tank 43 in real time and send electric signals to the programmable logic controller 2, and the intelligent digital pressure gauge 45 is not redundant in the prior art.
Embodiment two:
On the basis of the first embodiment, in this embodiment, after the programmable logic controller 2 receives the electrical signal sent by the electrical signal micro switch 63, the electromagnet 64 is controlled to be powered on by the external relay, so that the electromagnet 64 adsorbs the movable iron core 65, and the movable iron core 65 drives the butt joint nozzle 68 to move further backward in the adsorption process, so that the butt joint nozzle 68 clamps and fixes the external inner tube valve further, and when the programmable logic controller 2 powers off the electromagnet 64 by the external relay, under the extrusion force of the spring 62, the movable iron core 65 drives the butt joint nozzle 68 to move forward, so that the clamping force of the butt joint nozzle 68 disappears, and an operator takes away the sucked external inner tube valve, so as to quickly butt joint the external inner tube valve.
The quick-connection assembly 6 comprises an air pipe connector 61, a spring 62, an electric signal micro switch 63, an electromagnet 64, a movable iron core 65 and a butt joint nozzle 68, wherein the lower end face of the air suction clamp 5 is provided with the air pipe connector 61, the air pipe connector 61 is connected with the air suction pipe 41, the air pipe connector 61 is convenient for the air suction pipe 41 to be connected with the air suction clamp 5, the front end face of the air suction clamp 5 is provided with the butt joint nozzle 68, the butt joint nozzle 68 is matched with an external inner tube valve, the butt joint nozzle 68 is convenient for the external inner tube valve to be in butt joint with the air suction clamp 5, the front side of the annular side of the butt joint nozzle 68 is sleeved with a clamping nozzle claw 69, the clamping nozzle claw 69 enables the butt joint nozzle 68 to have better clamping effect, the butt joint sealing rubber pad 67 is arranged on the rear side inside the butt joint nozzle 68, the butt joint sealing rubber pad 67 enables the butt joint nozzle 68 to have better sealing performance with the air pipe connector 61 after a certain distance, the rear end face of the butt joint nozzle 68 is connected with the movable iron core 65, the movable iron core 65 is fixedly connected with the butt joint nozzle 68, the movable iron core 65 conveniently drives the butt joint nozzle 68 to move forwards and backwards, the movable iron core 65 is internally provided with an air guide core 66, the air guide core 66 is respectively communicated with the butt joint nozzle 68 and the air pipe connector 61.
The rear end face of the movable iron core 65 is provided with a pressing contact 651, the pressing contact 651 presses the electric signal micro switch 63 when moving backwards, a spring 62 is clamped at the rear side inside the movable iron core 65, the spring 62 protects the movable iron core 65 to apply a forward extrusion force, so that after the electromagnet 64 is powered off, the electromagnet 64 can automatically move forwards to restore the original position by the extrusion force of the spring 62, the electromagnet 64 is embedded at the rear side inside the air suction clamp 5, the electromagnet 64 is in signal connection with the programmable logic controller 2 through an external relay (the external relay is arranged inside the case 1 and is not shown in the figure), the electromagnet 64 generates a magnetic adsorption force after power is obtained, the movable iron core 65 automatically moves backwards, the electric signal micro switch 63 is installed at the rear side of the electromagnet 64, the electric signal micro switch 63 is in signal connection with the programmable logic controller 2, the electric signal micro switch 63 can send an electric signal to the programmable logic controller 2 when being pressed, so that the programmable logic controller 2 signal is controlled by the external relay to obtain electricity, the front end face of the air suction clamp 5 is clamped with the inner tube 681, and the butt joint performance between the inner tube 681 and the outer valve 68 is further improved.
Working principle: an operator holds the suction clamp 5 by hand and inserts the external inner tube valve into the butt joint valve 68, in the process, as the external inner tube valve can apply a certain extrusion force to the butt joint valve 68, the butt joint valve 68 pushes the movable iron core 65, the movable iron core 65 drives the pressing contact 651 to move backward, at the moment, the pressing contact 651 presses the electric signal micro switch 63, the electric signal micro switch 63 sends an electric signal to the programmable logic controller 2, the programmable logic controller 2 receives the electric signal sent by the electric signal micro switch 63 and then controls the electromagnet 64 to be electrified through the external relay, the electromagnet 64 adsorbs the movable iron core 65, the movable iron core 65 drives the butt joint valve 68 to move backward further in the adsorption process, so that the butt joint valve 68 clamps and fixes the external inner tube valve further, and meanwhile, the clamp claw 69 and the mouth sleeve 681 also enable the butt joint valve 68 to have better clamping stability, so that the situation of easily loosening and separating the external inner tube valve and the butt joint valve 68 is avoided; meanwhile, the programmable logic controller 2 controls the electric suction pump 44 to work through the external relay, so that the electric suction pump 44 sucks the vacuum tank 43, in the process, the intelligent digital pressure gauge 45 monitors the internal pressure of the vacuum tank 43 in real time and sends an electric signal to the programmable logic controller 2, after the internal negative pressure of the vacuum tank 43 reaches a preset value, the programmable logic controller 2 controls the electromagnetic valve 42 to be opened and closes the electric suction pump 44 through the external relay, at the moment, the negative pressure of the vacuum tank 43 sucks the suction clamp 5 through the suction pipe 41, and the suction clamp 5 sucks and sucks the external inner tube, in the process, the air guide inner core 66 guides the air in the butt joint nozzle 68 into the air pipe joint 61, so that the suction pipe 41 sucks the external inner tube; in the process that the external inner tube is sucked, the intelligent digital pressure gauge 45 sends the internal pressure of the vacuum tank 43 to the programmable logic controller 2 in real time, and when the internal pressure of the vacuum tank 43 rises to a preset value (the preset pressure value is the pressure value that all air in the external inner tube is sucked into the vacuum tank 43), the programmable logic controller 2 controls the electromagnetic valve 42 to be closed, so that the vacuum tank 43 is prevented from sucking the external inner tube through the air suction pipe 41 and the air suction clamp 5, and the external inner tube is prevented from being excessively sucked; meanwhile, the programmable logic controller 2 will power off the electromagnet 64 through the external relay, at this time, under the extrusion force of the spring 62, the movable iron core 65 will drive the butt joint nozzle 68 to move forward, so that the clamping force of the butt joint nozzle 68 disappears, so that the operator takes away the air-sucked external inner tube, and then the operator repeats the above operation to perform the air suction operation on the next group of external inner tubes.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a tight mechanism of inhaling of quick butt joint clamp of inner tube valve mouth, includes case (1), programmable logic controller (2), access door (3), anchor clamps (5) and removal truckle (7), its characterized in that: the intelligent air suction device is characterized in that an access door (3) is arranged on the front end face of the box shell (1), a programmable logic controller (2) is arranged on the upper side of the front end face of the access door (3), a movable caster (7) is arranged at the bottom of the box shell (1), an air suction fixture (5) is arranged in front of the box shell (1), an air suction assembly (4) for exhausting an external inner tube is arranged on the lower side of the interior of the box shell (1), and a quick connection assembly (6) for quickly butt-jointing and fixing an external inner tube valve is arranged inside the air suction fixture (5).
2. The rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 1, wherein: quick connect subassembly (6) include air pipe joint (61), spring (62), electric signal micro-gap switch (63), electro-magnet (64), move iron core (65) and butt joint mouth (68), the terminal surface is provided with air pipe joint (61) under suction anchor clamps (5), the terminal surface is provided with butt joint mouth (68) before suction anchor clamps (5), butt joint mouth (68) rear end face is connected with moves iron core (65), move inside rear side card of iron core (65) and be equipped with spring (62), suction anchor clamps (5) inside rear side inlays and is equipped with electro-magnet (64), and electro-magnet (64) are through external relay and programmable logic controller (2) signal connection, electric signal micro-gap switch (63) are installed to electro-magnet (64) rear side, and electric signal micro-gap switch (63) and programmable logic controller (2) signal connection.
3. The rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 2, wherein: the utility model provides a subassembly (4) breathes in, including breathing pipe (41), solenoid valve (42), vacuum tank (43) and electronic aspirator pump (44), air pipe joint (61) annular side cover is equipped with breathing pipe (41), vacuum tank (43) are installed to the inside downside of case (1), electronic aspirator pump (44) are installed to vacuum tank (43) end of giving vent to anger, and electronic aspirator pump (44) are through external relay and programmable logic controller (2) signal connection, install solenoid valve (42) between vacuum tank (43) inlet end and breathing pipe (41), and solenoid valve (42) and programmable logic controller (2) signal connection.
4. The rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 2, wherein: the front side of the annular side of the butt joint nozzle (68) is sleeved with a nozzle clamping jaw (69), the rear side of the inside of the butt joint nozzle (68) is provided with a butt joint sealing rubber pad (67), and the front end face of the air suction clamp (5) is clamped with a nozzle sleeve (681).
5. The rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 2, wherein: the movable iron core (65) is internally provided with an air guide inner core (66), the air guide inner core (66) is respectively communicated with the butt joint nozzle (68) and the air pipe joint (61), and the rear end face of the movable iron core (65) is provided with a pressing contact (651).
6. A rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 3, wherein: an intelligent digital pressure gauge (45) is arranged on the upper end face of the vacuum tank (43), the intelligent digital pressure gauge (45) is connected with the programmable logic controller (2) in a signal mode, and the air suction pipe (41) is made of a pressure-resistant hose.
7. The rapid butt-joint clamping suction mechanism for an inner tube valve according to claim 1, wherein: the protective end cover (52) is arranged on the rear end face of the air suction clamp (5), and the circuit protective shell (51) is arranged on the rear side of the lower end face of the air suction clamp (5).
CN202322599607.3U 2023-09-25 2023-09-25 Quick butt joint clamping suction mechanism for inner tube valve Active CN220957910U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322599607.3U CN220957910U (en) 2023-09-25 2023-09-25 Quick butt joint clamping suction mechanism for inner tube valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322599607.3U CN220957910U (en) 2023-09-25 2023-09-25 Quick butt joint clamping suction mechanism for inner tube valve

Publications (1)

Publication Number Publication Date
CN220957910U true CN220957910U (en) 2024-05-14

Family

ID=90978825

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322599607.3U Active CN220957910U (en) 2023-09-25 2023-09-25 Quick butt joint clamping suction mechanism for inner tube valve

Country Status (1)

Country Link
CN (1) CN220957910U (en)

Similar Documents

Publication Publication Date Title
CN220957910U (en) Quick butt joint clamping suction mechanism for inner tube valve
CN110722590A (en) Vacuum chuck device and robot
CN106965035A (en) Machine tool chip removal device
CN114165410A (en) Built-in double-air-passage air charging and exhausting device
CN113669619A (en) SF6 air supply device and SF6 air supply method
CN210619518U (en) Air tap capable of blowing and absorbing
CN110612018B (en) Full-automatic manufacturing assembly line for plug-in connection and connection section display
CN213642712U (en) A clearing device that is used for medical treatment department of respiration phlegm scab
CN211397842U (en) Tent pump
CN206810824U (en) Pick and place glass plate fixture
CN209526631U (en) A kind of tight mechanism of half stator clamp
CN209328873U (en) A kind of semiconductor core holder for x-ray film
CN213080464U (en) Loading and unloading device of laser cutting equipment
CN218435541U (en) Vacuum pumping device is used in cavity glass production
CN219727425U (en) Pressure control automatic inflator
CN210218188U (en) Air extraction equipment for repairing airplane slide
CN218255116U (en) Pneumatic pressure boost locomotive
CN204873812U (en) Anti -icing fluid filling rifle
CN214566410U (en) Vacuum device capable of automatically taking off line
CN218098520U (en) Sampling bottle with automatic pressure relief function when pressure is too high
CN218662641U (en) Automatic vacuum device that inhales of barrel material
CN214334168U (en) Hose airtightness detector
CN212996248U (en) Universal intelligent substation handheld device
CN216812049U (en) Built-in double-air-passage air charging and exhausting device
CN212194262U (en) A high-efficient ear area welding set for gauze mask production

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant