CN115077807B - Butterfly valve life test machine - Google Patents
Butterfly valve life test machine Download PDFInfo
- Publication number
- CN115077807B CN115077807B CN202211005355.0A CN202211005355A CN115077807B CN 115077807 B CN115077807 B CN 115077807B CN 202211005355 A CN202211005355 A CN 202211005355A CN 115077807 B CN115077807 B CN 115077807B
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- fixedly connected
- butterfly valve
- rectangular
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- plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/184—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Abstract
The invention discloses a butterfly valve service life testing machine, which comprises a base, wherein two vertical plates are symmetrically and fixedly connected to the upper end of the base, a transverse frame is fixedly connected to the upper ends of the two vertical plates together, and a butterfly valve body is arranged at the upper end of the base; the lower end of the transverse frame is provided with a limiting mechanism for limiting the butterfly valve body, the limiting mechanism comprises a hydraulic telescopic rod arranged in the lower end of the transverse frame, the telescopic end of the hydraulic telescopic rod is fixedly connected with a pressurizing limiting plate, and a transverse cavity is arranged in the pressurizing limiting plate; the upper end fixedly connected with rectangular plate of base. This testing machine is in the in-process of using, can just discover in the first time that the valve gas tightness has a problem, effectually avoided starting to close the extravagant time that detects again of certain number of times, and still be provided with the warning light that luminance can change, can make things convenient for the staff to carry out comparatively accurate aassessment to the gas tightness.
Description
Technical Field
The invention relates to the field of butterfly valve detection, in particular to a butterfly valve service life testing machine.
Background
The butterfly valve is widely applied to the industrial fields of petroleum, gas, chemical industry, water treatment and the like, and mainly comprises a valve body, a valve seat, a valve plate, a valve shaft and a transmission head, and is generally applied to a cylindrical channel;
the existing life test generally adopts a driving device, and then the butterfly valve is opened and closed in a reciprocating way, after the butterfly valve is started and closed for a certain number of times, the butterfly valve is detected in the air tightness, but in the mode, the air tightness of the butterfly valve cannot be detected at the first time when the air tightness of the butterfly valve is wrong, more time is wasted in display, and therefore, how to solve the problem is considered.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides the butterfly valve service life testing machine, which can be found out at the first time when the air tightness of a valve is problematic in the use process, effectively avoids the wasted time of starting to close for a certain time and then detecting, and is also provided with the warning lamp with changeable brightness, thereby being convenient for staff to evaluate the air tightness more accurately.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the butterfly valve service life testing machine comprises a base, wherein two vertical plates are symmetrically and fixedly connected to the upper end of the base, a transverse frame is fixedly connected to the upper ends of the two vertical plates together, and a butterfly valve body is arranged at the upper end of the base; the lower end of the transverse frame is provided with a limiting mechanism for limiting the butterfly valve body, the limiting mechanism comprises a hydraulic telescopic rod arranged in the lower end of the transverse frame, the telescopic end of the hydraulic telescopic rod is fixedly connected with a pressurizing limiting plate, and a transverse cavity is arranged in the pressurizing limiting plate; the upper end of the base is fixedly connected with a rectangular plate, and the front side of the rectangular plate is provided with a service life detection mechanism matched with the butterfly valve body; the upper end of the base is provided with a rectangular groove, and the rectangular groove and the transverse cavity are internally provided with an air tightness detection mechanism;
preferably, the life-span detection mechanism is including rotating the second bull stick of connection at the rectangular plate front side, the front side fixedly connected with rotor plate of second bull stick, the front side of rotor plate be circumference and change equidistant fixedly connected with a plurality of spacing fixture blocks, a plurality of spacing fixture blocks all cooperate with the rotation handle of butterfly valve body.
Preferably, the right side of base installs the motor, is located the right side the right-hand member rotation of riser is connected with first bull stick, the right-hand member of first bull stick passes through the driving medium transmission with the output shaft end of motor and is connected, the left end of first bull stick extends to between rotor plate and the rectangular plate to fixedly connected with first bevel gear, fixedly connected with and the second bevel gear of first bevel gear meshing on the second bull stick.
Preferably, the air tightness detection mechanism comprises a piston plate which is slidably connected in the rectangular groove, the lower end of the piston plate is fixedly connected with a magnetic sheet, the lower end of the magnetic sheet is elastically connected with the inner bottom of the rectangular groove through a first spring, an electromagnet is embedded in the inner bottom of the rectangular groove, like poles repel each other with the adjacent surface of the magnetic sheet after the electromagnet is electrified, a first conductive block capable of sliding left and right is arranged in the transverse cavity, the left side of the first conductive block is elastically connected with the left side inner wall of the transverse cavity through a second spring, a first electricity connection strip is embedded in the inner top of the transverse cavity, a resistor strip is embedded in the inner bottom of the transverse cavity, and the left side space of the transverse cavity is communicated with the lower space of the pressurizing limiting plate through an air inlet.
Preferably, the electromagnetic valve is installed in the air inlet, the warning lamp is installed on the right side of the vertical plate, and the warning lamp is matched with the first power connection strip and the resistor strip.
Preferably, be provided with the rectangle chamber in the base, rotate between the left and right sides inner wall in rectangle chamber and be connected with the threaded rod, the output shaft end of motor extends to the rectangle intracavity to with the right-hand member fixed connection of threaded rod, threaded connection has the screw slider on the threaded rod, the screw slider has conductivity, and with the inner wall sliding connection in rectangle chamber, the symmetry is provided with two electric pole that connect on the left side inner wall in rectangle chamber, two connect electric pole and electro-magnet cooperation, control switch is installed in the left side of base.
Preferably, the lower extreme fixedly connected with rectangle box of base, but be provided with the second conducting block of upper and lower slip in the rectangle box, the lower extreme of second conducting block passes through third spring and the interior bottom elastic connection of rectangle box, all inlay on the inner wall of the left and right sides of rectangle box and be equipped with the second and connect the electric strip, two the second connects electric strip to cooperate with the solenoid valve, the second conducting block is the iron slider, all inlay on the inner wall around the rectangle box and be equipped with the friction plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the staff can know at the first time that valve leakproofness has problems, can stop the test this moment to maintain the observation to the internals, reduced unnecessary time that detects extravagant.
2. The actual tightness of the butterfly valve body can be judged through the brightness of the warning lamp, the brighter the warning lamp is, the worse the tightness is, the subsequent evaluation of the tightness after the valve is damaged is facilitated, and the internal parts can be observed in a targeted manner according to the tightness to a certain extent.
Drawings
FIG. 1 is a schematic diagram of a butterfly valve life tester according to the present invention;
FIG. 2 is an enlarged view at A of FIG. 1;
FIG. 3 is an enlarged view at B of FIG. 1;
FIG. 4 is an enlarged view at C of FIG. 1;
FIG. 5 is a schematic front view of the connection of the rotating plate and the limit clamping block;
fig. 6 is a right side schematic view of the connection of the rotating plate and the rectangular plate.
In the figure: 1 base, 2 vertical plates, 3 horizontal frames, 4 hydraulic telescopic rods, 5 pressurization limiting plates, 6 butterfly valve bodies, 7 rectangular grooves, 8 piston plates, 9 magnetic sheets, 10 first springs, 11 warning lamps, 12 motors, 13 driving parts, 14 control switches, 15 rectangular plates, 16 rotating plates, 17 limiting clamping blocks, 18 first rotating rods, 19 first bevel gears, 20 second bevel gears, 21 transverse cavities, 22 first electric connection strips, 23 resistance strips, 24 first conductive blocks, 25 second springs, 26 friction plates, 27 air inlets, 28 electromagnets, 29 rectangular cavities, 30 threaded rods, 31 threaded sliding blocks, 32 electric connection columns, 33 rectangular boxes, 34 second conductive blocks, 35 third springs and 36 second electric connection strips.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1-6, a butterfly valve life tester comprises a base 1, wherein two vertical plates 2 are symmetrically and fixedly connected to the upper end of the base 1, a transverse frame 3 is fixedly connected to the upper ends of the two vertical plates 2 together, and a butterfly valve body 6 is arranged at the upper end of the base 1;
as one embodiment of the invention, the lower end of the transverse frame 3 is provided with a limiting mechanism for limiting the butterfly valve body 6, the limiting mechanism comprises a hydraulic telescopic rod 4 arranged in the lower end of the transverse frame 3, the telescopic end of the hydraulic telescopic rod 4 is fixedly connected with a pressurizing limiting plate 5, and a transverse cavity 21 is arranged in the pressurizing limiting plate 5;
as one implementation mode of the invention, the upper end of the base 1 is fixedly connected with a rectangular plate 15, the front side of the rectangular plate 15 is provided with a service life detection mechanism matched with the butterfly valve body 6, the service life detection mechanism comprises a second rotating rod which is rotationally connected with the front side of the rectangular plate 15, the front side of the second rotating rod is fixedly connected with a rotating plate 16, the front side of the rotating plate 16 is circumferentially and equidistantly connected with a plurality of limit clamping blocks 17, the limit clamping blocks 17 are matched with a rotating handle of the butterfly valve body 6, a motor 12 is arranged on the right side of the base 1, the motor 12 is a servo motor, when in use, after the motor rotates for a certain circle through an external program, the motor is stopped for one second, the circle is turned for fifteen seconds, and the action is repeated (finally, a valve plate inside the butterfly valve body 6 rotates for ninety degrees and then rotates for ninety degrees), the right end of the valve plate is rotationally connected with a first rotating rod 18, the right end of the first rotating rod 18 is rotationally connected with an output shaft of the motor 12 through a transmission piece 13, the transmission piece 13 is two belt pulleys, the two output shafts of the transmission piece 12 are respectively connected with the belt pulleys 12, the two output shafts of the motor 12 are respectively, the two output shafts of the motor 12 are fixedly connected with the first rotating rod 18 and the first rotating rod 19, and the bevel gear 19 are fixedly connected with the first rotating rod 19, and the first rotating rod is meshed with the bevel gear 19, and the first rotating rod is meshed with the first bevel gear, and the first drive shaft is fixed with the first bevel gear, and the drive shaft is connected;
as one implementation mode of the invention, the upper end of the base 1 is provided with a rectangular groove 7, the rectangular groove 7 and the transverse cavity 21 are internally provided with an air tightness detection mechanism together, the air tightness detection mechanism comprises a piston plate 8 which is connected in the rectangular groove 7 in a sliding way, the lower end of the piston plate 8 is fixedly connected with a magnetic sheet 9, the lower end of the magnetic sheet 9 is elastically connected with the inner bottom of the rectangular groove 7 through a first spring 10, an electromagnet 28 is embedded in the inner bottom of the rectangular groove 7, the electromagnet 28 is in homopolar repulsion with the adjacent surface of the magnetic sheet 9 after being electrified, a first conductive block 24 capable of sliding left and right is arranged in the transverse cavity 21, the left side of the first conductive block 24 is elastically connected with the left inner wall of the transverse cavity 21 through a second spring 25, the stiffness coefficient of the second spring 25 is smaller than that of the first spring 10, the inner top of the transverse cavity 21 is embedded with a first electricity receiving strip 22, the inner bottom of the transverse cavity 21 is embedded with a resistance strip 23, the left side space of the transverse cavity 21 is communicated with the lower space of the pressurizing limiting plate 5 through an air inlet 27, an electromagnetic valve is arranged in the air inlet 27, the right side vertical plate 2 is provided with a first electricity receiving strip 11 and a right electricity receiving strip 11, the right electricity strip is electrically connected with a first electricity receiving strip 11 and a right electricity strip 11, and a positive electricity strip 11 is electrically connected with a power supply 11 in turn, and a negative electricity strip is electrically connected with the first electricity strip 11, and the electric source 11 is connected with the electric source, and the electric source is connected with the electric source, and the electric station 18;
as one implementation mode of the invention, a rectangular cavity 29 is arranged in the base 1, a threaded rod 30 is rotationally connected between the inner walls of the left side and the right side of the rectangular cavity 29, the tail end of an output shaft of the motor 12 extends into the rectangular cavity 29 and is fixedly connected with the right end of the threaded rod 30, a threaded slider 31 is connected on the threaded rod 30 in a threaded manner, the threaded slider 31 has conductivity and is slidingly connected with the inner wall of the rectangular cavity 29, two power-connection columns 32 are symmetrically arranged on the inner wall of the left side of the rectangular cavity 29, the two power-connection columns 32 are matched with an electromagnet 28, the two power-connection columns 32, the threaded slider 31 and the electromagnet 28 form a first power-on piece, and a control switch 14 is arranged on the left side of the base 1;
as one embodiment of the invention, the lower end of the base 1 is fixedly connected with a rectangular box 33, a second conductive block 34 capable of sliding up and down is arranged in the rectangular box 33, the lower end of the second conductive block 34 is elastically connected with the inner bottom of the rectangular box 33 through a third spring 35, the inner walls of the left side and the right side of the rectangular box 33 are embedded with second electric connection strips 36, the two second electric connection strips 36 are matched with an electromagnetic valve, the second conductive block 34 is an iron slide block, the electromagnetic valve, the second conductive block 34 and the two second electric connection strips 36 form a second electric conduction piece, the first electric conduction piece and the second electric conduction piece are electrically connected with a power supply in parallel, the control switch 14 is arranged in a main circuit of the electric connection circuit, and friction plates 26 are embedded on the front inner wall and the rear inner wall of the rectangular box 33.
In the use process, firstly, the butterfly valve body 6 is placed at the upper end of the base 1 as shown in figure 1, a plurality of limit clamping blocks 17 penetrate through a plurality of through grooves at the twisting handle, at this time, the through holes at the lower end of the butterfly valve body 6 are communicated with the rectangular grooves 7, and then the hydraulic telescopic rod 4 is started to extend, so that the pressurization limit plate 5 moves downwards, and the through holes at the upper end of the butterfly valve body 6 are sealed;
when the service life test is carried out, the control switch 14 is only required to be started, the motor 12 is controlled by an external program, the motor is stopped for one second after the motor is rotated for a certain period by the external program, the motor is rotated for a period of fifteen seconds, the first rotating rod 18 also carries out the action under the cooperation of the transmission piece 13, and finally the first bevel gear 19 and the second bevel gear 20 drive the second rotating rod, the rotating plate 16 and the plurality of limiting clamping blocks 17 to carry out the action, so that the valve plate in the butterfly valve body 6 rotates for ninety degrees and then rotates for testing work;
in the process of energizing the control switch 14, the first energizing member and the second energizing member will have current passing through after being conducted, when the control switch is in the state of fig. 1, the first energizing member is energized, the electromagnet 28 will have current passing through, and will give a repulsive force to the piston plate 8, so that the piston plate 8 will have an upward moving tendency, but in this state, the butterfly valve body 6 is in a sealed state, so that the piston plate 8 will not move upward due to the air pressure, and then the threaded rod 30 will follow rotation during the starting and rotating of the motor 12, and the threaded slider 31 will make a right-and-left reciprocating movement, and the threaded slider 31 will leave the two power receiving posts 32, during this time, the electromagnet 28 will be powered off;
therefore, each time after the butterfly valve body 6 is restored to the sealing state of the internal valve plate, the piston plate 8 has an upward movement tendency, if the sealing performance of the butterfly valve body 6 is problematic in a certain detection process, the piston plate 8 at the moment moves upward, and the gas in the top space of the rectangular groove 7 is discharged into the internal channel of the butterfly valve body 6 and finally pressed into the left space of the transverse cavity 21 through the air inlet 27, so that the first conductive block 24 moves right to contact the first power connection strip 22 and the resistor strip 23, the warning lamp 11 is lightened, a worker can know the first time when the valve sealing performance is problematic, and can stop the test at the moment, maintain and observe the internal parts, and reduce the time wasted by redundant detection;
it should be noted that when the butterfly valve body 6 is restored to the sealed state, the electromagnet 28 will attract the second conductive block 34 to move upwards after being electrified, when the electromagnet moves upwards to the maximum height, the two second conductive bars 36 are not contacted any more, the electromagnetic valve is powered off, the air inlet 27 will be sealed again, and due to the arrangement of the friction plate 26, the second conductive block 34 moves upwards slowly, the electromagnetic valve can be closed after being electrified for a period of time, that is, the electrified time of the electromagnetic valve is constant, in the constant time, if the distance of the first conductive block 24 moving rightwards is larger, the gas amount passing through the butterfly valve body 6 is larger per unit time, the tightness inside the butterfly valve body 6 is worse, and the distance of the first conductive block 24 moving rightwards is larger, the connected resistor bar 23 is shorter, the resistance is smaller, and finally the current passing through the warning lamp 11 is larger, so that the actual tightness inside the butterfly valve body 6 can be judged by the brightness of the warning lamp 11, the brighter the warning lamp 11, the tightness is worse, the convenience is brought to follow-up damage of the valve, and the tightness can be evaluated according to a certain degree of tightness inside the observation;
if the gas in the transverse cavity 21 is required to be released later, the control switch 14 is turned on and the motor 12 is started to perform one-time reciprocating driving only when the butterfly valve body 6 is not placed.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The butterfly valve service life testing machine comprises a base (1), and is characterized in that two vertical plates (2) are symmetrically and fixedly connected to the upper end of the base (1), a transverse frame (3) is fixedly connected to the upper ends of the two vertical plates (2), and a butterfly valve body (6) is arranged at the upper end of the base (1);
the lower end of the transverse frame (3) is provided with a limiting mechanism for limiting the butterfly valve body (6), the limiting mechanism comprises a hydraulic telescopic rod (4) arranged in the lower end of the transverse frame (3), the telescopic end of the hydraulic telescopic rod (4) is fixedly connected with a pressurizing limiting plate (5), and a transverse cavity (21) is arranged in the pressurizing limiting plate (5);
the device is characterized in that the upper end of the base (1) is fixedly connected with a rectangular plate (15), the front side of the rectangular plate (15) is provided with a service life detection mechanism matched with the butterfly valve body (6), the service life detection mechanism comprises a second rotating rod rotationally connected to the front side of the rectangular plate (15), the front side of the second rotating rod is fixedly connected with a rotating plate (16), a plurality of limit clamping blocks (17) are fixedly connected to the front side of the rotating plate (16) at equal intervals in a circumferential rotation manner, and the limit clamping blocks (17) are matched with a rotating handle of the butterfly valve body (6);
rectangular slot (7) have been seted up to the upper end of base (1), be provided with gas tightness detection mechanism jointly in rectangular slot (7) and horizontal chamber (21), gas tightness detection mechanism includes piston board (8) of sliding connection in rectangular slot (7), the lower extreme fixedly connected with magnetic sheet (9) of piston board (8), the lower extreme of magnetic sheet (9) and the interior bottom of rectangular slot (7) pass through first spring (10) elastic connection, the interior bottom of rectangular slot (7) is inlayed and is equipped with electro-magnet (28), with the adjacent face homopolar repulsion of magnetic sheet (9) after electro-magnet (28) circular telegram, but be provided with left and right sliding first conducting block (24) in horizontal chamber (21), the left side of first conducting block (24) and the left side inner wall of horizontal chamber (21) pass through second spring (25) elastic connection, the interior top of horizontal chamber (21) is inlayed and is equipped with first electric strip (22), the interior bottom of horizontal chamber (21) is inlayed and is equipped with resistance strip (23), the space (27) are passed through with air intake side space (5) intercommunication below.
2. The butterfly valve life testing machine according to claim 1, wherein a motor (12) is installed on the right side of the base (1), a first rotating rod (18) is rotatably connected to the right end of the vertical plate (2) located on the right side, the right end of the first rotating rod (18) is in transmission connection with the tail end of an output shaft of the motor (12) through a transmission piece (13), the left end of the first rotating rod (18) extends between the rotating plate (16) and the rectangular plate (15) and is fixedly connected with a first bevel gear (19), and a second bevel gear (20) meshed with the first bevel gear (19) is fixedly connected to the second rotating rod.
3. The butterfly valve life testing machine according to claim 1, wherein an electromagnetic valve is installed in the air inlet (27), a warning lamp (11) is installed on the right side of the vertical plate (2) located on the right side, and the warning lamp (11) is matched with the first power connection strip (22) and the resistor strip (23).
4. The butterfly valve life testing machine according to claim 2, wherein a rectangular cavity (29) is arranged in the base (1), a threaded rod (30) is rotatably connected between inner walls of the left side and the right side of the rectangular cavity (29), the tail end of an output shaft of the motor (12) extends into the rectangular cavity (29) and is fixedly connected with the right end of the threaded rod (30), a threaded slider (31) is connected to the threaded rod (30) in a threaded manner, the threaded slider (31) is conductive and is slidably connected with the inner wall of the rectangular cavity (29), two power connection posts (32) are symmetrically arranged on the inner wall of the left side of the rectangular cavity (29), the two power connection posts (32) are matched with the electromagnet (28), and the control switch (14) is arranged on the left side of the base (1).
5. The butterfly valve life testing machine according to claim 3, wherein the lower end of the base (1) is fixedly connected with a rectangular box (33), a second conductive block (34) capable of sliding up and down is arranged in the rectangular box (33), the lower end of the second conductive block (34) is elastically connected with the inner bottom of the rectangular box (33) through a third spring (35), second electric connection strips (36) are embedded in the inner walls of the left side and the right side of the rectangular box (33), the two second electric connection strips (36) are matched with the electromagnetic valve, the second conductive block (34) is an iron slide block, and friction plates (26) are embedded in the front inner wall and the rear inner wall of the rectangular box (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211005355.0A CN115077807B (en) | 2022-08-22 | 2022-08-22 | Butterfly valve life test machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211005355.0A CN115077807B (en) | 2022-08-22 | 2022-08-22 | Butterfly valve life test machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115077807A CN115077807A (en) | 2022-09-20 |
| CN115077807B true CN115077807B (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211005355.0A Active CN115077807B (en) | 2022-08-22 | 2022-08-22 | Butterfly valve life test machine |
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| Country | Link |
|---|---|
| CN (1) | CN115077807B (en) |
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2022
- 2022-08-22 CN CN202211005355.0A patent/CN115077807B/en active Active
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| CN115077807A (en) | 2022-09-20 |
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