CN103104810A - Positive / negative pressure gas circuit generating device - Google Patents

Positive / negative pressure gas circuit generating device Download PDF

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Publication number
CN103104810A
CN103104810A CN2013100258790A CN201310025879A CN103104810A CN 103104810 A CN103104810 A CN 103104810A CN 2013100258790 A CN2013100258790 A CN 2013100258790A CN 201310025879 A CN201310025879 A CN 201310025879A CN 103104810 A CN103104810 A CN 103104810A
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relay
negative pressure
pressure
proportional valve
malleation
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CN103104810B (en
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高群
张正涛
张大朋
徐德
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Institute of Automation of Chinese Academy of Science
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Institute of Automation of Chinese Academy of Science
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Abstract

The invention discloses a positive / negative pressure gas circuit generating device which comprises the following parts including an air intake port, an air filter, an oil mist filter, a vacuum generator, a three-way solenoid valve, a positive pressure proportional valve, a negative pressure proportional valve, a T-shaped pipe, a vacuum filter and an air outlet. Further, the positive / negative gas circuit generating device further comprises a control part. The conversion of working mode of positive / negative pressure and adjustment of the size of pressure can be achieved through control of the vacuum generator, the three-way solenoid valve, the positive pressure proportional valve and the negative pressure proportional valve. The positive / negative pressure gas circuit generating device can freely control the generation of the positive pressure circuit and the negative pressure circuit. Meanwhile, the pressure can be fed back, adjusted and controlled by means of manual and automatic working modes. The positive / negative pressure gas circuit generating device can provide stable and reliable positive pressure and negative pressure, and further has the advantages of being small and exquisite in volume, easy to carry at the same time and applicable to various vacuum absorbed type clamping devices.

Description

Just a kind of/negative pressure gas circuit generating means
Technical field
The present invention relates to thin slice or thin wall component clamping technical field in accurate assembling, specifically a kind of gas circuit generating means for the vacuum-adsorption type clamp holder.
Background technique
In accurate assembling field, have some thin slices or thin wall component (thickness is at the 10-100 micron), their characteristics are that light weight, matter are soft, mutability, frangible, usually adopt the vacuum-adsorption type clamp holder to carry out clamping carrying and assembling to it.
Traditional vacuum generating device precision on the one hand can't satisfy the demands, and reliable and stable negative pressure can not be provided; On the other hand, when we adsorbed the part of some light weights, device can't discharge automatically, and we also need to add certain malleation to discharge the part of light weight.Therefore, need badly and a kind ofly can produce stable negative pressure and malleation and can realize the real-time controllable device of pressure.
Summary of the invention
The object of the present invention is to provide a kind of in precision assembling the vacuum-adsorption type clamp holder just needed/negative pressure gas circuit generating means, to satisfy in thin slice, thin wall component clamping operating process the demand to gas circuit.
In order to achieve the above object, the present invention proposes just a kind of/negative pressure gas circuit generating means, it is characterized in that, described device comprises with lower component: suction port 1, air filter 2, oil mist filter 3, vacuum generator 4, three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7, T shape pipe 8, vacuum filter 9, air outlet 10; Wherein, described suction port 1, air filter 2, oil mist filter 3 are linked in sequence; The input port of described vacuum generator 4 is connected with the delivery outlet of oil mist filter 3, and the output port of described vacuum generator 4 is connected with the input port of three-way magnetic valve 5; The first output port of described three-way magnetic valve 5 is connected with the input port of malleation Proportional valve 6, and the second output port of described three-way magnetic valve 5 is connected with the input port of negative pressure Proportional valve 7; The output port of described malleation Proportional valve 5 is connected with the first end of described T shape pipe 8, the output port of described negative pressure Proportional valve 7 is connected with the second end of described T shape pipe 8, the 3rd end of described T shape pipe 8 is connected with the input port of described vacuum filter 9, and the output port of described vacuum filter is connected 10 with described air outlet.
Especially, described device also comprises a controlling component, it is electrically connected to described vacuum generator 4, described three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7, realizes producing the working method conversion of malleation/negative pressure and the adjusting of pressure size by the control to described vacuum generator 4, described three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7.
Especially, described controlling component also comprises a single-chip microcomputer 12, the first relay R L1, the second relay R L2, the 3rd relay R L3, the 4th relay R L4, the 5th relay R L5, and ad/da converter, wherein said single-chip microcomputer 12 and the first relay R L1, the second relay R L2, the 3rd relay R L3, the 4th relay R L4, the 5th relay R L5, and ad/da converter is connected; Vacuum generator 4 just/feeder ear of negative pressure mode of operation, three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7 directly is connected with the first relay R L1, the second relay R L2, the 3rd relay R L3, the 4th relay R L4, the 5th relay R L5 by wire respectively; The folding of described the first relay R L1 is controlled respectively vacuum generator 4 malleation mode of operations and is not worked; The folding of the second relay R L2 is controlled respectively vacuum generator 4 negative pressure mode of operations and is not worked; The power on/off of three-way magnetic valve 5 is controlled respectively in the folding of the 3rd relay R L3; The power on/off of malleation Proportional valve 6 is controlled respectively in the folding of the 4th relay R L4; The power on/off of negative pressure Proportional valve 7 is controlled respectively in the folding of the 5th relay R L5.
Especially, described control gear also comprises a positive/negative-pressure selector switch 21, and it is connected with single-chip microcomputer 12, is used for malleation working method/negative pressure working method is switched; When positive/negative-pressure selector switch 21 is in the malleation mode of operation, described single-chip microcomputer 12 is controlled the first relay R L1, the 3rd relay R L3 and the 4th relay R L4 adhesive, the second relay R L2 and the 5th relay R L5 open circuit, make vacuum generator 4 output malleations, gas through the first output port of three-way magnetic valve 5 to malleation Proportional valve 6 to T shapes pipes 8 to vacuum filter 9 to the air outlet 10 output malleations;
When positive/negative-pressure selector switch 21 is in the negative pressure mode of operation, single-chip microcomputer 12 controls the first relay R L1, the 3rd relay R L3 and the 4th relay R L4 opens circuit, the second relay R L2 and the 5th relay R L5 adhesive, make vacuum generator 4 output negative pressure, gas through the second output port of three-way magnetic valve 5 to negative pressure Proportional valve 7 to T shapes pipes 8 to vacuum filter 9 to the air outlet 10 output negative pressure.
Especially, described control gear also comprises a malleation adjusting knob 19 and a negative pressure adjusting knob 20; Described malleation adjusting knob 19 and a negative pressure adjusting knob are connected with first, second analog input end AIN0, the AIN1 of ad/da converter 18 by wire, and single-chip microcomputer gathers the pressure size of manual tune by ad/da converter; Described malleation Proportional valve 6, negative pressure Proportional valve 7 have respectively the air pressure feedback end, and its output voltage represents respectively just to flow through/size of negative pressure Proportional valve 6,7 pressure, be connected with the 3rd, the 4th analog input end AIN2, the AIN3 of ad/da converter 18 by wire; Described malleation Proportional valve 6, negative pressure Proportional valve 7 have respectively the air pressure adjustment control end, and it is connected with the first analog output AOUT of ad/da converter 18 by wire; Described single-chip microcomputer 12 gathers the pressure size signalization of described first, second analog input end AIN0, AIN1, the folding size that the first analog output AOUT by ad/da converter after conversion treatment controls positive/negative-pressure Proportional valve 6,7 is with flow through its pressure size of control.
Especially, described controlling component also comprises: a mode of operation selector switch 22, and it is connected with described single-chip microcomputer 12, is used for the switching between manual work pattern and automatic operation mode;
Under described manual mode, the size of delivery pressure can be regulated by malleation adjusting knob 19, negative pressure adjusting knob 20; Under described automatic operation mode, by RS-232 interface, directly send instruction to single-chip microcomputer by computer, by the corresponding relay work of Single-chip Controlling, the size of positive/negative-pressure working method and delivery pressure is controlled.
Especially, under described automatic operation mode, the size information of just the flowing through of the air pressure feedback end feedback of the pressure size configuration information that described single-chip microcomputer 12 sends according to computer and described malleation Proportional valve 6, negative pressure Proportional valve 7/negative pressure Proportional valve 6,7 pressure realizes that the closed-loop feedback of pressure is controlled.
Especially, ad/da converter has the resolution of 8, realizes that 255 grades of pressure are adjustable.
Especially, described device comprises that a control box 11 is used for holding each parts of described device, wherein, the front panel of described control box 11 is provided with a LCD liquid crystal display panel 24, described positive/negative-pressure selector switch 21, described mode of operation selector switch 22 and described positive and negative pressure and regulates button 19,20, the rear board of described control box is provided with described suction port 1, air outlet 10, RS-232 interface and outlet; Described LCD liquid crystal display panel 24 is used for showing current mode of operation, positive/negative-pressure working method, and current atmospheric pressure value.
Technological scheme in the present invention has respectively following one or more technique effect:
(1) the present invention can freely control the generation of malleation, negative pressure gas circuit, satisfy clamping to different parts, when discharging to the demand of gas circuit.
(2) the present invention has manually and automatic two kinds of mode of operations, can switch fast the positive/negative-pressure working method, and is simple to operate.
(3) the present invention can carry out feedback regulation control to air pressure, and reliablely and stablely positive and negative air-pressure can be provided.
(4) the present invention is applicable to various vacuum-adsorption type clamp holders, and volume is small and exquisite, be easy to carry.
Description of drawings
Fig. 1 is just/negative pressure gas circuit generating means schematic diagram.
Fig. 2 is the structural representation of controlling component in just/negative pressure gas circuit generating means.
Fig. 3 is that malleation working method gas circuit flows to schematic diagram.
Fig. 4 is that negative pressure working method gas circuit flows to schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 be in the embodiment of the present invention just/negative pressure gas circuit generating means schematic diagram.This device comprises with lower component: suction port 1, air filter 2, oil mist filter 3, vacuum generator 4, three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7, T shape pipe 8, vacuum filter 9, air outlet 10, further, described device also comprises a control box 11, and described parts all are installed in control box.
Described suction port 1, air filter 2, oil mist filter 3 are linked in sequence;
The input port of described vacuum generator 4 is connected with the delivery outlet of oil mist filter 3, and the output port of described vacuum generator 4 is connected with the input port of three-way magnetic valve 5;
The output port 1 of described three-way magnetic valve 5 is connected with the input port of malleation Proportional valve 6, and the output port 2 of described three-way magnetic valve 5 is connected with the input port of negative pressure Proportional valve 7;
The output port of described malleation Proportional valve 5 is connected with the first end of described T shape pipe 8, the output port of described negative pressure Proportional valve 7 is connected with the second end of described T shape pipe 8, the 3rd end of described T shape pipe 8 is connected with the input port of described vacuum filter 9, and the output port of described vacuum filter is connected 10 with described air outlet.
Described device also comprises a controlling component (not shown in accompanying drawing), it is electrically connected to described vacuum generator 4, described three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7, realizes producing the working mode change of malleation/negative pressure and the adjusting of pressure size by the control to described vacuum generator 4, described three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7.
Those skilled in the art should understand, above-mentioned suction port 1, air filter 2, oil mist filter 3, vacuum generator 4, three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7, T shape pipe 8, vacuum filter 9, air outlet 10 are the parts of having known in prior art, therefore, its concrete structure and working principle repeat no more.
concrete, in an embodiment, for example, air filter 2 adopts the AF20-01BC of SMC, oil mist filter 3 adopts the AFM20-01BC of SMC, vacuum generator 4 adopts the ZM131SH-K5LZB-E15L of SMC, three-way magnetic valve 5 adopts the VT307-50-01-F of SMC, malleation Proportional valve 6 adopts ITV2050-212BL5 (the delivery pressure scope: 0~0.9Mpa) of SMC, the ITV2090-212BL5 of negative pressure Proportional valve 7 employing SMC (the delivery pressure scope: 0~-80kpa), T shape pipe 8 adopts the KQ2T06-00 of SMC, vacuum filter 9 adopts the ZFC200-06B of SMC, suction port 1 and air outlet 10 are common erecting of panel joint, all devices are arranged in control box 11, and it is of a size of: wide 300mm, high 250mm, dark 400mm.
Concrete, described control box 11 comprises a front operation panel, described front operation panel comprises a LCD liquid crystal display panel 24, malleation adjusting knob 19, negative pressure adjusting knob 20, positive/negative-pressure selector switch 21, mode of operation selector switch 22, wherein positive/negative-pressure selector switch 21 is for the working method of selecting malleation or negative pressure, and mode of operation selector switch 22 is used for selecting manually, automatic mode of operation; Described control box comprises a rear board, and described rear board includes suction port 1, air outlet 10, RS-232 interface and outlet.
Fig. 2 is the structural representation of controlling component in just/negative pressure gas circuit generating means.Single-chip microcomputer 12 in described controlling component, relay R L1, RL2, RL3, RL4, RL5, the AD/DA chips welding is on pcb board 25, and single-chip microcomputer 12 is connected with computer 23 by Serial Port Line RS-232 and realizes program control.Mode of operation selector switch 22, positive/negative-pressure selector switch 21 connect by control pin corresponding on winding displacement and single-chip microcomputer, vacuum generator 4 just/feeder ear of negative pressure mode of operation, three-way magnetic valve 5, malleation Proportional valve 6, negative pressure Proportional valve 7 directly is connected with relay R L1, RL2, RL3, RL4, RL5 on pcb board 25 by wire respectively.The folding of relay R L1 is controlled respectively vacuum generator 4 malleation mode of operations and is not worked; The folding of relay R L2 is controlled respectively vacuum generator 4 negative pressure mode of operations and is not worked; The power on/off of three-way magnetic valve 5 is controlled respectively in the folding of relay R L3; The power on/off of malleation Proportional valve 6 is controlled respectively in the folding of relay R L4; The power on/off of negative pressure Proportional valve 7 is controlled respectively in the folding of relay R L5.
Malleation adjusting knob 19, negative pressure adjusting knob 20 are connected with analog input end AIN0, the AIN1 of ad/da converter 18 by wire, and single-chip microcomputer gathers the pressure size of manual tune by ad/da converter.The air pressure feedback end of malleation Proportional valve 6, negative pressure Proportional valve 7 output 0~5V voltage just representing to flow through/size of negative pressure Proportional valve pressure, be connected with analog input end AIN2, the AIN3 of ad/da converter 18 by wire, single-chip microcomputer gathers the size of the Proportional valve pressure of flowing through that Real-time Feedback returns and is presented on LCD liquid crystal display panel 24 by ad/da converter.The air pressure adjustment control end of malleation Proportional valve 6, negative pressure Proportional valve 7 is connected with the analog output AOUT of ad/da converter 18 by wire.The pressure size signalization of analog input end AIN0, AIN1 that single-chip microcomputer gathers is directly changed into the analog output AOUT of 0~5V analogue signal by ad/da converter and controls the folding size of positive and negative Proportional valve and then control its pressure size of flowing through.
When positive/negative-pressure selector switch 21 is in the malleation mode of operation, single-chip microcomputer 12 control relay RL1, RL3 and RL4 adhesive, RL2 and RL5 open circuit.Make vacuum generator 4 output malleations, gas through the output terminal 5-1 of three-way magnetic valve to malleation Proportional valve 6 to T shape pipes to vacuum filter to the air outlet 10 output malleations.Gas circuit flows to schematic diagram as shown in Figure 3.
When positive/negative-pressure selector switch 21 is in the negative pressure mode of operation, single-chip microcomputer 12 control relay RL1, RL3 and RL4 open circuit, RL2 and RL5 adhesive.Make vacuum generator 4 output negative pressure, gas through the output terminal 5-2 of three-way magnetic valve to negative pressure Proportional valve 7 to T shape pipes to vacuum filter to the air outlet 10 output negative pressure.Gas circuit flows to schematic diagram as shown in Figure 4.
Under manual work pattern, the size of delivery pressure can be regulated by malleation adjusting knob 19, negative pressure adjusting knob 20; Under automatic operation mode, pass through RS-232 interface, directly send instruction to single-chip microcomputer by computer, and undertaken the size of positive/negative-pressure working method and delivery pressure is controlled by the corresponding relay work of Single-chip Controlling according to the communication protocol of formulating, it, therefore repeats no more with manually identical the control principle of each parts and flow process.
Further, under automatic operation mode, the size information of just the flowing through of the air pressure feedback end feedback of the pressure size configuration information that described single-chip microcomputer 12 can send according to computer and described malleation Proportional valve 6, negative pressure Proportional valve 7/negative pressure Proportional valve 6,7 pressure realizes that the closed-loop feedback of pressure is controlled.
LCD liquid crystal display panel 24 on the control box front panel is used for showing current mode of operation for automatically still manual, malleation or negative pressure working method, and current atmospheric pressure value.
Practical application proves, the invention process convenience, and simple to operate, compact structure is small and exquisite.Can satisfy the vacuum-adsorption type clamp holder to the demand of gas circuit.
Above-described specific embodiment; purpose of the present invention, technological scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. just/negative pressure gas circuit generating means, it is characterized in that, described device comprises with lower component: suction port (1), air filter (2), oil mist filter (3), vacuum generator (4), three-way magnetic valve (5), malleation Proportional valve (6), negative pressure Proportional valve (7), T shape pipe (8), vacuum filter (9), air outlet (10); Wherein, described suction port (1), air filter (2), oil mist filter (3) are linked in sequence; The input port of described vacuum generator (4) is connected with the delivery outlet of oil mist filter (3), and the output port of described vacuum generator (4) is connected with the input port of three-way magnetic valve (5); The first output port of described three-way magnetic valve (5) is connected with the input port of malleation Proportional valve (6), and the second output port of described three-way magnetic valve (5) is connected with the input port of negative pressure Proportional valve (7); The output port of described malleation Proportional valve (5) is connected with the first end that described T shape is managed (8), the output port of described negative pressure Proportional valve (7) is connected with the second end that described T shape is managed (8), the 3rd end of described T shape pipe (8) is connected with the input port of described vacuum filter (9), the output port of described vacuum filter be connected with described air outlet (10).
2. device as claimed in claim 1, it is characterized in that, described device also comprises a controlling component, it is electrically connected to described vacuum generator (4), described three-way magnetic valve (5), malleation Proportional valve (6), negative pressure Proportional valve (7), realizes producing the working method conversion of malleation/negative pressure and the adjusting of pressure size by the control to described vacuum generator (4), described three-way magnetic valve (5), malleation Proportional valve (6), negative pressure Proportional valve (7).
3. device as claimed in claim 2, it is characterized in that, described controlling component also comprises a single-chip microcomputer (12), the first relay (RL1), the second relay (RL2), the 3rd relay (RL3), the 4th relay (RL4), the 5th relay (RL5), and ad/da converter, wherein said single-chip microcomputer (12) and the first relay (RL1), the second relay (RL2), the 3rd relay (RL3), the 4th relay (RL4), the 5th relay (RL5), and ad/da converter is connected, vacuum generator (4) just/feeder ear of negative pressure mode of operation, three-way magnetic valve (5), malleation Proportional valve (6), negative pressure Proportional valve (7) directly is connected with the first relay (RL1), the second relay (RL2), the 3rd relay (RL3), the 4th relay (RL4), the 5th relay (RL5) by wire respectively, the folding of described the first relay (RL1) is controlled respectively vacuum generator (4) malleation mode of operation and is not worked, the folding of the second relay (RL2) is controlled respectively vacuum generator (4) negative pressure mode of operation and is not worked, the power on/off of three-way magnetic valve (5) is controlled respectively in the folding of the 3rd relay (RL3), the power on/off of malleation Proportional valve (6) is controlled respectively in the folding of the 4th relay (RL4), the power on/off of negative pressure Proportional valve (7) is controlled respectively in the folding of the 5th relay (RL5).
4. device as claimed in claim 3, it is characterized in that: described control gear also comprises a positive/negative-pressure selector switch (21), it is connected with single-chip microcomputer (12), is used for malleation working method/negative pressure working method is switched; When positive/negative-pressure selector switch (21) is in the malleation mode of operation, described single-chip microcomputer (12) is controlled the first relay (RL1), the 3rd relay (RL3) and the 4th relay (RL4) adhesive, the second relay (RL2) opens circuit with the 5th relay (RL5), make vacuum generator (4) output malleation, gas manage (8) through the first output port of three-way magnetic valve (5) and 10 is exported malleations to vacuum filter (9) to the air outlet to malleation Proportional valve (6) to T shape;
When positive/negative-pressure selector switch (21) is in the negative pressure mode of operation, single-chip microcomputer (12) is controlled the first relay (RL1), the 3rd relay (RL3) and the 4th relay (RL4) and is opened circuit, the second relay (RL2) and the 5th relay (RL5) adhesive, make vacuum generator (4) output negative pressure, gas manage (8) through the second output port of three-way magnetic valve (5) and 10 is exported negative pressure to vacuum filter (9) to the air outlet to negative pressure Proportional valve (7) to T shape.
5. device as claimed in claim 4, is characterized in that, described control gear also comprises a malleation adjusting knob (19) and a negative pressure adjusting knob (20); Described malleation adjusting knob (19) and a negative pressure adjusting knob are connected with first, second analog input end (AIN0, AIN1) of ad/da converter (18) by wire, and single-chip microcomputer gathers the pressure size of manual tune by ad/da converter; Described malleation Proportional valve (6), negative pressure Proportional valve (7) have respectively the air pressure feedback end, its output voltage represents respectively just flowing through/negative pressure Proportional valve (6,7) size of pressure is connected with the 3rd, the 4th analog input end (AIN2, AIN3) of ad/da converter (18) by wire; Described malleation Proportional valve 6, negative pressure Proportional valve 7 have respectively the air pressure adjustment control end, and it is connected with first analog output (AOUT) of ad/da converter 18 by wire; Described single-chip microcomputer (12) gathers the pressure size signalization of described first, second analog input end (AIN0, AIN1), the folding size of controlling positive/negative-pressure Proportional valve (6,7) by first analog output (AOUT) of ad/da converter after conversion treatment is with flow through its pressure size of control.
6. device as claimed in claim 5, is characterized in that, described controlling component also comprises: a mode of operation selector switch (22), and it is connected with described single-chip microcomputer (12), is used for the switching between manual work pattern and automatic operation mode;
Under described manual mode, the size of delivery pressure can be regulated by malleation adjusting knob (19), negative pressure adjusting knob (20); Under described automatic operation mode, by RS-232 interface, directly send instruction to single-chip microcomputer by computer, by the corresponding relay work of Single-chip Controlling, the size of positive/negative-pressure working method and delivery pressure is controlled.
7. device as claimed in claim 6, it is characterized in that, under described automatic operation mode, just flowing through/negative pressure Proportional valve (6 of the air pressure feedback end feedback of described single-chip microcomputer (12) configuration information big or small according to the pressure of computer transmission and described malleation Proportional valve (6), negative pressure Proportional valve (7), 7) size information of pressure realizes that the closed-loop feedback of pressure is controlled.
8. device as claimed in claim 7, is characterized in that, ad/da converter has the resolution of 8, realizes that pressure is can 255 grades adjustable.
9. device as claimed in claim 8, it is characterized in that, described device comprises that a control box (11) is used for holding each parts of described device, wherein, the front panel of described control box (11) is provided with a LCD liquid crystal display panel (24), described positive/negative-pressure selector switch (21), described mode of operation selector switch (22) and described positive and negative pressure and regulates button (19,20), the rear board of described control box is provided with described suction port (1), air outlet (10), RS-232 interface and outlet; Described LCD liquid crystal display panel (24) is used for showing current mode of operation, positive/negative-pressure working method, and current atmospheric pressure value.
CN201310025879.0A 2013-01-24 2013-01-24 A kind of positive/negative pressure gas channel generating means Expired - Fee Related CN103104810B (en)

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CN109612763A (en) * 2019-01-16 2019-04-12 中铁第四勘察设计院集团有限公司 The clamping mechanism of tunnel protection door and pressure decay test device comprising the clamping mechanism
CN109668709A (en) * 2019-01-16 2019-04-23 中铁第四勘察设计院集团有限公司 A kind of pressure decay test system suitable for tunnel protection door
CN111459053A (en) * 2019-01-22 2020-07-28 汉达精密电子(昆山)有限公司 Positive and negative pressure fast switching device
CN110032223A (en) * 2019-04-18 2019-07-19 安徽皖仪科技股份有限公司 High-precision positive/negative-pressure is double to apply automatically controlled regulator
CN110594588A (en) * 2019-08-20 2019-12-20 湖南金时科技有限公司 Vacuum constant pressure air supply device
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