CN114382689A - Air pressure controllable system for polyurethane balloon forming equipment - Google Patents
Air pressure controllable system for polyurethane balloon forming equipment Download PDFInfo
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- CN114382689A CN114382689A CN202210179435.1A CN202210179435A CN114382689A CN 114382689 A CN114382689 A CN 114382689A CN 202210179435 A CN202210179435 A CN 202210179435A CN 114382689 A CN114382689 A CN 114382689A
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- air pressure
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 16
- 239000004814 polyurethane Substances 0.000 title claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 230000001965 increasing effect Effects 0.000 claims description 16
- 230000001939 inductive effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims 6
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000007726 management method Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 210000003238 esophagus Anatomy 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 210000005077 saccule Anatomy 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an air pressure control system for polyurethane balloon forming equipment, wherein an air pressure management device is composed of a plurality of air pressure control assemblies, each air pressure control assembly comprises a reversing valve, an air storage tank, a switch valve, a quick connector and an adjustable regulating valve, a port P of a first reversing valve is connected with the switch valve, ports A, B of the first reversing valve are respectively connected with one air storage tank, and ports A, B of a second reversing valve are respectively connected with the two air storage tanks; the P port of the second reversing valve is sequentially connected with the adjustable regulating valve and the quick connector in series; the multiple polyurethane balloon forming devices can be supplied with air by one air source device, so that not only is accurate and efficient compressed air provided for the forming devices, but also an integral air pressure controllable management system is established, compressed air with different air pressures can be provided for multiple devices together, and accurate air supply can be carried out on a single device; need not carry out other settings, it is convenient simple, require to reduce the maintainer, maintenance cost is lower.
Description
Technical Field
The invention relates to the technical field of air pressure control, in particular to an air pressure controllable system for polyurethane balloon forming equipment.
Background
The balloon catheter is a key device for dredging blood vessels, trachea, esophagus and intestinal tracts of a human body and conveying widely used stents, and the balloon is the most key part on the balloon catheter; the saccule generally requires extremely high anti-explosion performance, and simultaneously requires thin wall, softness and foldability; to meet the requirements, the used polymer material is required to have extremely strong mechanical and physical properties, and meanwhile, the high requirements are provided for the forming process; to meet the process requirements, the forming equipment must accurately and efficiently provide heat, pressure, and a wide range of speed and displacement adjustments, as well as provide accurate temperature and pressure control.
The existing polyurethane balloon forming equipment is matched with one compressor, so that accurate and efficient compressed gas can be provided for the forming equipment; however, the investment of production equipment is high, and the installation, maintenance and management of the equipment are responsible and cumbersome.
Disclosure of Invention
In the prior art, the invention aims to provide an air pressure controllable system which is convenient to install and reasonable in structure.
In order to achieve the purpose, the invention provides the following technical scheme:
the air pressure controllable system for the polyurethane balloon forming equipment comprises an air source device, an air pressure management device connected with the air source device and a plurality of pieces of equipment, wherein the air pressure management device is used for distributing compressed air produced by the air source device to each piece of equipment;
the air pressure management device is composed of a plurality of air pressure control assemblies, each air pressure control assembly comprises a first reversing valve, a second reversing valve, an air storage tank, a switch valve, a quick connector and an adjustable regulating valve, and the first reversing valve and the second reversing valve are two-position three-way reversing valves; a port P of the first reversing valve is connected with a switch valve, ports A, B of the first reversing valve are respectively connected with one air storage tank, and ports A, B of the second reversing valve are respectively connected with two air storage tanks; the P port of the second reversing valve is sequentially connected with the adjustable regulating valve and the quick connector in series, and the input port of the adjustable regulating valve is connected with the second reversing valve; the quick interface is used to connect devices.
Furthermore, an adjustable pressure increasing valve is connected in series between the first reversing valve and the switch valve, and an output port of the adjustable pressure increasing valve is connected with the first reversing valve.
Furthermore, an electronic pressure gauge is connected between the output port of the adjustable regulating valve and the quick interface, and the adjustable regulating valve is an electric adjustable pressure reducing valve.
Furthermore, the quick interface is a quick interface with a one-way valve function, and an inductive switch is arranged in the quick interface and used for detecting whether the quick interface is connected with a connector or not.
Furthermore, the switch valve is an electric switch valve, and a pressure sensor is arranged in the air storage tank; the first reversing valve and the second reversing valve are two-position three-way two-way electromagnetic reversing valves.
Furthermore, a master control unit is arranged in the air pressure management device, and the master control unit is connected with the switch valve, the adjustable regulating valve, the pressure sensor, the induction switch, the adjustable booster valve, the reversing valve and the electronic pressure gauge.
Furthermore, the air pressure management device is connected with the air source device through an air source main valve; the air pressure management device is connected with a plurality of devices through single-control switch valves.
The invention also provides a control method of the air pressure controllable system, which comprises the following steps:
s1, connecting the equipment to be connected with the quick interface of the air pressure management device through a joint, controlling the corresponding switch valve to open by the master control unit, and connecting the air source master valve and the single control switch valve connected with the equipment;
s2, the master control unit controls the first reversing valve to switch, so that the air source device alternately charges compressed air into the two air storage tanks connected with the first reversing valve;
s3, when the air pressure in one air storage tank reaches a preset value, the master control unit controls the second reversing valve to be switched to one side connected with the air storage tank; and supplying the compressed gas of the gas storage tank to equipment connected with the quick connector through a second reversing valve, and adjusting the gas pressure of the compressed gas to the gas pressure required by the equipment by using an adjustable adjusting valve.
Furthermore, the compressed gas generated by the gas source device is subjected to one-step pressurization through an adjustable pressurization valve.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme, the air pressure management device adopts an air pressure control assembly as equipment for independent air supply, the air pressure control assembly is provided with a quick interface with a one-way valve function, and an inductive switch for detecting whether the quick interface is connected with a connector or not is arranged in the quick interface; whether the air pressure control assembly is connected with equipment can be detected, the opening and closing of a switch valve arranged in the air pressure control assembly is controlled by the master control unit, and compressed air can be provided for each equipment independently in a one-to-one correspondence manner; meanwhile, the pressure is regulated by utilizing a pressure increasing valve and an adjustable regulating valve according to the air pressure requirement of each device; therefore, the integral air pressure controllable management system is established, compressed air with different air pressures can be provided for a plurality of devices together, and accurate air supply can be carried out on a single device.
According to the technical scheme, the adjustable pressurization valve takes compressed air as a power source, and gas can be pressurized without any power source; the air pressure management device can improve the air pressure of the output port under the condition that an additional power source is not needed.
According to the technical scheme, the air pressure control assembly adopts two air storage tanks and a reversing valve to provide compressed air for equipment in turn, and an adjustable pressure increasing valve arranged in the air pressure control assembly is used for increasing the pressure of the compressed air in one step; thereby set up the pressure value of adjustable booster valve delivery outlet according to the required pressure value of different equipment, make the atmospheric pressure that the gas holder is exported be greater than the required pressure value of equipment all the time.
In addition, the two gas storage tanks supply gas to the equipment in turn through the switching of the second reversing valve, and the gas pressure of the compressed gas is adjusted to the gas pressure required by the equipment through the adjustable adjusting valve; therefore, the compressed gas provided by the gas pressure control assembly is always ensured to be continuous, and the gas pressure of the compressed gas is always the gas pressure required by the equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a system block diagram of a pneumatic controllable system according to the present invention.
FIG. 2 is a system diagram of the air pressure management device according to the present invention.
Fig. 3 is a schematic structural diagram 1 of the pneumatic control assembly of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to one of fig. 1-3, the present invention provides a technical solution:
as shown in fig. 1, the air pressure controllable system for the polyurethane balloon forming device comprises an air supply device, an air pressure management device connected with the air supply device, and a plurality of devices, wherein the air pressure management device is used for distributing compressed air produced by the air supply device to each device, and is composed of a plurality of air pressure control assemblies.
The air pressure management device is connected with the air source device through an air source main valve; the air pressure management device is connected with a plurality of devices through the single-control switch valve.
The air pressure management device adopts an air pressure control assembly to supply air for equipment independently, the air pressure control assembly is provided with a quick interface 8 with a one-way valve function, and an inductive switch 81 for detecting whether the quick interface 8 is connected with a connector is arranged in the quick interface 8; whether the air pressure control assembly is connected with equipment can be detected, the opening and closing of a switch valve 1 arranged in the air pressure control assembly is controlled through a master control unit, and compressed air can be provided for each equipment independently in a one-to-one correspondence manner; therefore, the integral air pressure controllable management system is established, compressed air with different air pressures can be provided for a plurality of devices together, and accurate air supply can be carried out on a single device.
As shown in fig. 2-3, the pneumatic control assembly includes a first directional valve 31, a second directional valve 32, a gas storage tank 4, a switch valve 1, a quick connector 8, and an adjustable regulating valve 6, wherein the first directional valve 31 and the second directional valve 32 are two-position three-way directional valves; a port P of the first reversing valve 31 is connected with the switch valve 1, ports A, B of the first reversing valve 31 are respectively connected with one air storage tank 4, and ports A, B of the second reversing valve 32 are respectively connected with two air storage tanks 4; the P port of the second reversing valve 32 is sequentially connected with the adjustable regulating valve 6 and the quick connector 8 in series, and the input port of the adjustable regulating valve 6 is connected with the second reversing valve 32; the quick interface 8 is used for connecting devices.
Wherein, an adjustable pressure increasing valve 2 is connected in series between the first reversing valve 31 and the switch valve 1, and the output port of the adjustable pressure increasing valve 2 is connected with the first reversing valve 31; an electronic pressure gauge 7 is connected between the output port of the adjustable regulating valve 6 and the quick connector 8, and the adjustable regulating valve 6 is an electric adjustable pressure reducing valve.
The air pressure control assembly adopts two air storage tanks 4 and a reversing valve to provide compressed air for equipment in turn, and an adjustable booster valve 2 arranged in the air pressure control assembly boosts the compressed air in one step; thereby set up the pressure value of adjustable booster valve 2 delivery outlet according to the required pressure value of different equipment, make the atmospheric pressure of gas holder 4 output be greater than the required pressure value of equipment all the time.
In addition, the two gas storage tanks 4 supply gas to the equipment in turn through the switching of the second reversing valve 32, and the gas pressure of the compressed gas is adjusted to the gas pressure required by the equipment through the adjustable adjusting valve 6; therefore, the compressed gas provided by the gas pressure control assembly is always ensured to be continuous, and the gas pressure of the compressed gas is always the gas pressure required by the equipment.
Furthermore, the adjustable booster valve 2 takes compressed air as a power source, and can boost the gas without any power supply; the air pressure management device can improve the air pressure of the output port under the condition of not needing an additional power source; under the condition that the air pressure generated by the air source device is relatively low, the air pressure control assembly of the air pressure management device can output corresponding air pressure by using the adjustable pressure increasing valve 2 according to the air pressure requirements of different equipment, so that the application range of the air pressure management device is greatly increased.
Wherein, the adjustable pressure increasing valve 2 can be an adjustable double-end single-action gas pressure increasing valve; the adjustable pressure increasing valve 2 greatly meets the requirements of equipment on the flow and the pressure of compressed gas generated by the air pressure control assembly, and the adjustable pressure increasing valve 2 is higher in stability, larger in output flow and wider in application range of the air pressure control assembly.
The quick connector 8 is a quick connector 8 with a one-way valve function, an inductive switch 81 is arranged in the quick connector 8, and the inductive switch 81 is used for detecting whether the quick connector 8 is connected with a connector or not; whether each air pressure control assembly is connected with equipment or not can be detected, and the equipment is transmitted to a background system in real time through a master control unit connected with the air pressure control assembly; meanwhile, the switch valve 1 arranged in the air pressure control assembly is controlled to be opened and closed through the master control unit, and compressed air can be provided for each device independently in a one-to-one correspondence manner;
wherein, the switch valve 1 is an electric switch valve, and a pressure sensor 41 is arranged in the gas storage tank 4; the first reversing valve 31 and the second reversing valve 32 are two-position three-way two-way electromagnetic reversing valves;
the air pressure management device is internally provided with a master control unit, and the master control unit is connected with the switch valve 1, the adjustable regulating valve 6, the pressure sensor 41, the induction switch 81, the adjustable pressure increasing valve, the reversing valve and the electronic pressure gauge 7.
Furthermore, the background system can detect the parameters of each air pressure control component in real time through the master control unit; according to the air pressure requirements of different devices, the opening and closing of the switch valve 1, the adjustable regulating valve 6, the adjustable booster valve 2 and the reversing valve in each air pressure control assembly are accurately controlled, the output pressure of each air pressure control assembly is further regulated, and the automation degree of the air pressure management device is greatly improved.
The invention also provides a control method of the air pressure controllable system, which comprises the following steps:
s1, connecting the equipment to be connected with the quick interface 8 of the air pressure management device through a joint, controlling the corresponding switch valve 1 to be opened by the master control unit, and connecting the air source main valve and the single control switch valve connected with the equipment;
whether the quick interface 8 is connected with a connector or not is detected by using the inductive switch 81, whether the air pressure control assembly is connected with equipment or not can be detected, and the equipment is transmitted to a background system in real time through a master control unit connected with the air pressure control assembly; meanwhile, the built-in switch valve 1 of the air pressure control assembly is controlled to be opened through the master control unit.
S2, the master control unit controls the first reversing valve 31 to switch, so that the air source device alternately charges compressed air into the two air storage tanks 4 connected with the first reversing valve 31.
The master control unit controls the first reversing valve 31 to switch, so that the switch valve 1 and one of the gas storage tanks 4 are filled with compressed gas; when the pressure sensor 41 in the gas storage tank 4 detects that the gas pressure in the gas storage tank 4 reaches the set value, the master control unit controls the first reversing valve 31 to be switched to the other side, and the other gas storage tank 4 connected with the first reversing valve 31 is filled with compressed gas.
S3, when the air pressure in one air storage tank 4 reaches a preset value, the master control unit controls the second reversing valve 32 to be switched to one side connected with the air storage tank 4; the compressed gas in the gas storage tank 4 is supplied to the equipment connected with the quick connector 8 through the second reversing valve 32, and the gas pressure of the compressed gas is adjusted to the gas pressure required by the equipment by using the adjustable adjusting valve 6.
Wherein, the compressed gas generated by the gas source device is pressurized in one step through the adjustable pressurizing valve 2.
The two gas storage tanks 4 supply gas to the equipment in turn through the switching of the second reversing valve 32, and the gas pressure of the compressed gas is adjusted to the gas pressure required by the equipment through the adjustable adjusting valve 6; therefore, the compressed gas provided by the gas pressure control assembly is always ensured to be continuous, and the gas pressure of the compressed gas is always the gas pressure required by the equipment.
In conclusion, the plurality of polyurethane balloon forming devices can be supplied with gas by one gas source device, so that not only can accurate and efficient compressed gas be provided for the forming devices, but also an integral gas pressure controllable management system is established, so that compressed gas with different gas pressures can be provided for a plurality of devices together, and accurate gas supply can be performed on a single device; need not carry out other settings, it is convenient simple, require to reduce the maintainer, maintenance cost is lower.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A controllable system of atmospheric pressure for polyurethane balloon former characterized in that: the device comprises an air source device, an air pressure management device and a plurality of devices, wherein the air pressure management device is connected with the air source device and is used for distributing compressed air produced by the air source device to each device; the air pressure management device is composed of a plurality of air pressure control assemblies, each air pressure control assembly comprises a first reversing valve (31), a second reversing valve (32), an air storage tank (4), a switch valve (1), a quick connector (8) and an adjustable regulating valve (6), and the first reversing valve (31) and the second reversing valve (32) are two-position three-way reversing valves; the P port of the first reversing valve (31) is connected with the switch valve (1), the A, B ports of the first reversing valve (31) are respectively connected with one air storage tank (4), and the A, B ports of the second reversing valve (32) are respectively connected with two air storage tanks (4); the P port of the second reversing valve (32) is sequentially connected with the adjustable regulating valve (6) and the quick connector (8) in series, and the input port of the adjustable regulating valve (6) is connected with the second reversing valve (32); the quick interface (8) is used for connecting equipment.
2. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: an adjustable pressure increasing valve (2) is connected in series between the first reversing valve (31) and the switch valve (1), and an output port of the adjustable pressure increasing valve (2) is connected with the first reversing valve (31).
3. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: an electronic pressure gauge (7) is connected between the output port of the adjustable regulating valve (6) and the quick connector (8), and the adjustable regulating valve (6) is an electric adjustable pressure reducing valve.
4. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: quick interface (8) are quick interface (8) for having the check valve function, and quick interface (8) embeds there is inductive switch (81), and this inductive switch is used for detecting whether quick interface (8) are connected with the joint.
5. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: the switch valve (1) is an electric switch valve, and a pressure sensor (41) is arranged in the air storage tank (4); the first reversing valve (31) and the second reversing valve (32) are two-position three-way two-way electromagnetic reversing valves.
6. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: the air pressure management device is internally provided with a master control unit, and the master control unit is connected with the switch valve (1), the adjustable regulating valve (6), the pressure sensor (41), the inductive switch (81), the adjustable booster valve (2), the reversing valve and the electronic pressure gauge (7).
7. A pneumatically controllable system for a polyurethane balloon molding apparatus as claimed in claim 1, wherein: the air pressure management device is connected with the air source device through an air source main valve; the air pressure management device is connected with a plurality of devices through single-control switch valves.
8. A method of controlling an air pressure controllable system, comprising the steps of:
s1, connecting the equipment to be connected with a quick interface (8) of the air pressure management device through a connector, controlling the corresponding switch valve (1) to be opened by the master control unit, and connecting the air source main valve and the single control switch valve connected with the equipment;
s2, the master control unit controls the first reversing valve (31) to switch, so that the air source device alternately charges compressed air into the two air storage tanks (4) connected with the first reversing valve (31);
s3, when the air pressure in one air storage tank (4) reaches a preset value, the master control unit controls the second reversing valve (32) to be switched to the side connected with the air storage tank (4); the compressed gas of the gas storage tank (4) is supplied to the equipment connected with the quick connector (8) through a second reversing valve (32), and the gas pressure of the compressed gas is adjusted to the gas pressure required by the equipment by an adjustable adjusting valve (6).
9. The method of claim 8, wherein: the compressed gas generated by the gas source device is pressurized in one step through the adjustable pressurization valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210179435.1A CN114382689A (en) | 2022-02-25 | 2022-02-25 | Air pressure controllable system for polyurethane balloon forming equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210179435.1A CN114382689A (en) | 2022-02-25 | 2022-02-25 | Air pressure controllable system for polyurethane balloon forming equipment |
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|---|---|
| CN114382689A true CN114382689A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210179435.1A Pending CN114382689A (en) | 2022-02-25 | 2022-02-25 | Air pressure controllable system for polyurethane balloon forming equipment |
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| CN (1) | CN114382689A (en) |
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| CN101413781A (en) * | 2008-11-21 | 2009-04-22 | 浙江大学宁波理工学院 | Method and device for detecting connection state of metal fast joint |
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