CN210484760U - Pneumatic automatic control device of valve - Google Patents
Pneumatic automatic control device of valve Download PDFInfo
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- CN210484760U CN210484760U CN201920877690.7U CN201920877690U CN210484760U CN 210484760 U CN210484760 U CN 210484760U CN 201920877690 U CN201920877690 U CN 201920877690U CN 210484760 U CN210484760 U CN 210484760U
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Abstract
The utility model discloses a pneumatic automatic control device of a valve, which comprises a filtering pressure reducing valve, a solenoid valve, two quick-discharge valves and a cylinder, wherein the solenoid valve controls the telescopic motion of a piston rod in the cylinder by receiving an electric signal; a piston rod of the cylinder is connected with the valve so as to control the opening/closing action of the valve through the telescopic motion of the piston rod; the electromagnetic valve is not fixed on the cylinder body of the cylinder. According to the pneumatic automatic control device, the electromagnetic valve is independently fixed on the steel plate instead of the cylinder body, so that the problem that the electromagnetic valve falls off from the cylinder body due to the fact that the thread hole of the cylinder body slides due to large pipeline vibration is solved; the addition of the quick exhaust valve and the pneumatic reversing valve in the pneumatic automatic control device accelerates the air intake and exhaust speed of the cylinder, shortens the time of the valve opening/closing action and solves the problem of slow valve opening/closing action.
Description
Technical Field
The utility model relates to an automatic control technical field of valve, more specifically relates to a pneumatic automatic control device of valve.
Background
Hundreds of pneumatic automatic control valves such as pneumatic automatic control ball valves, butterfly valves and the like are used on pipelines of the PVC polymerization device, and the pneumatic automatic control device of the valves consists of air cylinders and electromagnetic valves. Because the cylinder body of cylinder is aluminium system material, the solenoid valve of connecting in the cylinder body side through the screw rod is because of self overweight, and the phenomenon that cylinder body silk hole slips often appears in the big pipeline vibration during the material is thrown to the polymeric kettle of PVC polymerization facility in addition, causes the solenoid valve to drop from the cylinder body, leads to the unable normal switch action of pneumatic automatic control valve. If the valve on the pipeline can not be normally opened and closed during the feeding period of the polymerization kettle, emergency stop is needed for rush repair under the condition of feeding the polymerization kettle, which seriously restricts the feeding production of the polymerization kettle.
The method for solving the problem of thread hole thread slipping for the first time is to damage the cylinder body
Screw hole is expanded into
Re-connecting the intermediate joint of the re-distribution source for use, and finally connecting the intermediate joint of the re-distribution source to two cylinders after two months
The screw hole has the phenomenon of screw sliding, and if the hole is expanded on the cylinder body continuously, the fixing screw cannot penetrate through the existing mounting hole of the electromagnetic valve to be connected. The number of damaged valves of various specifications in one year of operating the PVC polymerization device is as much as 8, and if the whole PVC polymerization device is replaced, the total amount of each year is at least 171568 yuan calculated according to the contract unit price of 21446 yuan only, except for the loss affecting the production yield. In order to reduce procurement costs and ensure continuous production, the problems need to be solved fundamentally. Meanwhile, the pneumatic automatic control device only consisting of the cylinder and the electromagnetic valve has the problem of slow valve opening/closing action when controlling the pneumatic automatic control valve.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pneumatic automatic control device of valve, through the mounted position who changes the solenoid valve and the air feed return circuit who reforms transform pneumatic automatic control device to solve the pipe-line vibration that exists among the prior art and cause the solenoid valve to drop and the slow problem of automatic valve opening/closing action greatly.
The utility model adopts the following technical scheme:
the pneumatic automatic control device of the valve comprises a filtering pressure reducing valve, an electromagnetic valve, two quick exhaust valves and an air cylinder, wherein an air inlet of the filtering pressure reducing valve is connected with an instrument air source, an air outlet of the filtering pressure reducing valve is connected with an air inlet of the electromagnetic valve, and compressed air from the instrument air source is filtered and decompressed and then sent into the electromagnetic valve.
Two execution ports of the electromagnetic valve are connected with air inlets of the two quick exhaust valves, the execution ports of the two quick exhaust valves are connected with two air ports of the air cylinder, and the electromagnetic valve controls the telescopic motion of a piston rod in the air cylinder by receiving electric signals; a piston rod of the cylinder is connected with the valve so as to control the opening/closing action of the valve through the telescopic motion of the piston rod; the electromagnetic valve is not fixed on the cylinder body of the cylinder.
Preferably, the solenoid valve is fixed to a steel plate.
Preferably, the solenoid valve is a two-position five-way single electric control solenoid valve.
Preferably, the air inlet of the electromagnetic valve and the two execution ports of the electromagnetic valve are respectively connected with each other
The two air ports of the cylinder are respectively connected with
The ferrule type straight-through joint.
Preferably, the pneumatic control reversing valve is further included and is installed between the electromagnetic valve and the two quick exhaust valves.
Preferably, two execution ports of the electromagnetic valve are connected with two control ports of the pneumatic control reversing valve, two execution ports of the pneumatic control reversing valve are connected with air inlets of two quick-discharge valves, and an air inlet of the pneumatic control reversing valve and an air inlet of the electromagnetic valve are respectively connected with an air outlet of the filtering and reducing valve.
Preferably, the air inlet, the two control ports and the two execution ports of the pneumatic control reversing valve are respectively connected with
The ferrule type straight-through joint.
Preferably, the pneumatic control reversing valve is a pressurization control reversing valve.
Preferably, the air outlet of the filtering and pressure reducing valve is connected with
The ferrule type three-way joint.
Compared with the prior art, the utility model provides a pair of pneumatic automatic control device of valve has following advantage: the electromagnetic valve is independently fixed on the steel plate instead of the cylinder body, so that the problem that the electromagnetic valve falls off from the cylinder body due to the fact that the thread hole of the cylinder body slides due to large pipeline vibration is solved; the installation of the quick exhaust valve in the pneumatic automatic control device enables the exhaust of the cylinder to be quickly exhausted without passing through the electromagnetic valve, thereby accelerating the telescopic movement speed of the piston rod in the cylinder, shortening the opening/closing action time of the valve and solving the problem of slow opening/closing action of the valve; the installation of the pneumatic control reversing valve in the pneumatic automatic control device increases the air inlet channel of the air cylinder, accelerates the air inlet speed of the air cylinder, further shortens the time of the valve opening/closing action and solves the problem of slow valve opening/closing action.
Drawings
Fig. 1 is a schematic structural diagram of the pneumatic automatic control device provided by the present invention.
Fig. 2 is the structural schematic diagram of the pneumatic automatic control device provided with the pneumatic control reversing valve.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements and techniques of the present invention so that advantages and features of the present invention may be more readily understood when implemented in a suitable environment. The following description is an embodiment of the present invention, and other embodiments related to the claims that are not explicitly described also fall within the scope of the claims.
Fig. 1 shows a schematic structural diagram of a pneumatic automatic control device provided by the present invention.
As shown in fig. 1, the device comprises a filter pressure reducing valve 1, a solenoid valve 2, two quick exhaust valves 3a and 3b and a cylinder 4, wherein an air inlet P of the filter pressure reducing valve 1 is connected with an instrument air source 5, and an air outlet a of the filter pressure reducing valve 1 is connected with an air inlet P of the solenoid valve 2, so that compressed air from the instrument air source is filtered and decompressed and then sent into the solenoid valve 2.
The two actuating ports A, B of the electromagnetic valve 2 are connected with the air inlets P of the two quick exhaust valves 3a, 3b, the actuating ports A of the two quick exhaust valves 3a, 3b are connected with the two air ports A, B of the cylinder 4, and the electromagnetic valve 2 controls the telescopic motion of the piston rod 41 in the cylinder 4 by receiving an electric signal.
The piston rod 41 of the cylinder 4 is connected with a valve to control the opening/closing action of the valve through the telescopic motion of the piston rod 41.
The electromagnetic valve 2 is not fixed to the cylinder body of the cylinder 4.
In this embodiment, the cylinder is a double-acting cylinder, and includes a cylinder body, a piston rod and a piston, the cylinder body has two air ports a and B, when the first air port a is used for air intake, the second air port B is used for air exhaust, and when the first air port a is used for air exhaust, the second air port B is used for air intake, so as to drive the piston rod 41 in the cylinder 4 to make telescopic action.
In this embodiment, two quick exhaust valves are used for quickly exhausting gas, and the operating principle is as follows: the quick exhaust valve has three valve ports, namely, an air inlet P is connected with an air source pipe, an execution port A is connected with an execution element, and an outer exhaust port T is communicated with the atmosphere. When compressed air is input into the air inlet P, the valve core is pushed to move right, and the air inlet P is communicated with the execution port A to supply air to the execution element; when no compressed air is input into the air inlet P, the air in the actuating element makes the valve core move to the left through the actuating port A, the passage of the air inlet P and the actuating port A is blocked, the passage of the actuating port A and the outer discharge port T is opened at the same time, and the air is rapidly discharged through the outer discharge port T. The two quick exhaust valves are connected between the electromagnetic valve and the cylinder, so that exhaust of the cylinder is quickly exhausted without passing through the electromagnetic valve, the telescopic motion speed of a piston rod in the cylinder is accelerated, and the opening/closing time of the valves is shortened.
In this embodiment, solenoid valve 2 is fixed on the steel sheet, and this solenoid valve 2 does not lead to the cylinder body lug connection with cylinder 4, consequently, through fixing the solenoid valve on the steel sheet alone, rather than fixing on the cylinder body of cylinder, has avoided the big cylinder body silk hole that leads to of pipeline vibration to slide the silk and cause the problem that the solenoid valve drops from the cylinder body. This steel sheet can select a 50X 150 mm's steel sheet to fix solenoid valve 2, rather than fixing solenoid valve 2 in the side of cylinder body, no matter in actual production, pipeline vibration is big, and the steel sheet of fixed solenoid valve 2 can not vibrate, and is same, and solenoid valve 2 also can not vibrate, consequently, can avoid the problem that the big cylinder body screw hole smooth silk that leads to of pipeline vibration that exists causes among the prior art leads to the fact the solenoid valve to drop from the cylinder body completely, has guaranteed the normal on/off action of automatic control valve. Meanwhile, the modification method prolongs the service life of the cylinder, saves the valve replacement purchase cost which is about 171568 yuan per year, saves the spare part cost of the valve, reduces the workload of maintenance personnel, and powerfully ensures the normal feeding of the production line.
In this embodiment, the solenoid valve is a two-position five-way single-electric solenoid valve, where two positions indicate that the solenoid valve has two position states, and single electric control indicates that the solenoid valve has a single coil control, and the air circuit switching is performed in two working states, i.e., on state or off state. The five-way valve has five through holes, including an air inlet P, two actuating ports A, B, and two air outlets R, S.
The air inlet P of the electromagnetic valve 2 and the two actuating ports A, B of the electromagnetic valve 2 are respectively connected with
The two air ports A, B of the cylinder 4 are respectively connected with a ferrule type straight-through joint
The ferrule type straight-through joint.
The cutting sleeve type joint is a cutting sleeve type pipe joint and consists of three parts: the connector body, cutting ferrule, nut. After the cutting ferrule and the nut are sleeved on the air source pipe and inserted into the joint body, when the nut is screwed, the outer side of the front end of the cutting ferrule is attached to the conical surface of the joint body, and effective sealing is formed. The cutting sleeve type joint is divided into a cutting sleeve type straight joint and a cutting sleeve type three-way joint, wherein the straight joint or the three-way joint is divided into a reducing straight joint or a three-way joint.
In this example, 2 are introduced
The air source pipes are respectively connected to the actuating ports A of the two quick exhaust valves 3a and 3b from the cutting sleeve type straight-through joints of the two air ports A, B of the air cylinder 4, and 1 air inlet P of each of the two quick exhaust valves 3a and 3b is led out
Is connected to two actuating ports A, B of the solenoid valve 2, 1 from the air inlet P of the solenoid valve 2
The air source pipe is connected to the air outlet A of the filtering and pressure reducing valve 1.
When the electromagnetic valve 2 receives a DCS operation valve opening (closing) instruction signal, the electromagnetic valve is electrified (loses electricity) and the magnetic rod is attracted (falls down), clean and impurity-free instrument air is selectively fed into an execution port B or A of the electromagnetic valve 2 through the filtering and reducing valve 1 after passing through an air inlet P of the electromagnetic valve 2, then the instrument air is fed into the air cylinder 4 through the quick exhaust valve 3a or 3B, the piston rod 41 is pushed to act, and meanwhile, the air in the air cylinder 4 is exhausted through the quick exhaust valve 3B or 3 a. The air supply loop of the air cylinder 4 is switched according to the electrified or power-off condition of the electromagnetic valve 2, and the air source selectively enters the two quick exhaust valves for air intake or exhaust through the control of the electromagnetic valve 2, so that the action speed of the piston rod 41 in the air cylinder 4 is increased, and the valve is opened or closed in the shortest time.
Fig. 2 shows the structure schematic diagram of the pneumatic automatic control device provided with the pneumatic control reversing valve.
As shown in fig. 2, the pneumatic automatic control device further comprises a pneumatic control reversing valve 6, wherein the pneumatic control reversing valve 6 is installed between the electromagnetic valve 2 and the two quick discharge valves 3a and 3 b.
The specific connection relationship is as follows: two execution ports A, B of the electromagnetic valve 2 are connected with two control ports Y, Z of the pneumatic control reversing valve 6, two execution ports A, B of the pneumatic control reversing valve 6 are connected with air inlets P of two quick discharge valves 3a and 3b, and the air inlet P of the pneumatic control reversing valve 6 and the air inlet P of the electromagnetic valve 2 are respectively connected with an air outlet A of the filtering and reducing valve 1.
The installation of the pneumatic reversing valve 6 in the pneumatic automatic control device increases the air inlet channel of the air cylinder 4, accelerates the air inlet speed of the air cylinder 2, further shortens the time of the valve opening/closing action and solves the problem of slow valve opening/closing action.
The pneumatic control reversing valve 6 uses gas pressure to move the main valve core so as to change the flow direction of gas, and can be divided into three types of pressure control, pressure relief control and differential pressure control according to different control modes. The pressurization control means that the pressure of the applied pneumatic control signal is gradually increased, and when the air pressure is increased to the action pressure of the main valve core, the main valve is reversed; the pressure relief control means that the pressure of the applied pneumatic control signal is gradually reduced, and when the pressure is reduced to a certain pressure value, the main valve is reversed; the differential pressure control is the reversing of the main valve core under the action of the pressure difference between two ends. In this embodiment, the pneumatic control directional valve 6 is a pressurization-controlled directional valve.
The air inlet P, the two control ports Y, Z and the two execution ports A, B of the pneumatic control reversing valve 6 are respectively connected with
The ferrule type straight-through joint. The air outlet A of the filtering pressure reducing valve 1 is connected with
The clamping sleeve type three-way joint enables the air outlet A of the filtering and reducing valve 1 to be simultaneously connected with the air inlet P of the pneumatic control reversing valve 6 and the air inlet P of the electromagnetic valve 2 through the clamping sleeve type three-way joint.
In this example, 2 are introduced
The air source pipes are respectively connected to the actuating ports A of the two quick exhaust valves 3a and 3b from the cutting sleeve type straight-through joints of the two air ports A, B of the air cylinder 4, and 1 air inlet P of each of the two quick exhaust valves 3a and 3b is led out
Is connected to two actuating ports A, B of the pneumatic control reversing valve 6, and 1 air source is led from each of two control ports Y, Z of the pneumatic control reversing valve 6
Is connected to two actuating ports A, B of the solenoid valve 2, 1 from each of the air inlet P of the pneumatic control reversing valve 6 and the air inlet P of the solenoid valve 2
The air source pipe is connected to the air outlet A of the filtering and pressure reducing valve 1.
When the electromagnetic valve 2 receives a command signal of opening (closing) the DCS operation valve, the electromagnetic valve is electrified (loses electricity) and the magnetic rod is sucked (falls down), clean and impurity-free instrument air selectively enters the execution port B or A of the electromagnetic valve through the filtering and reducing valve 1 after passing through the air inlet P of the electromagnetic valve 2, then enters the quick exhaust valve 3a or 3B through the execution port B or A of the pneumatic control reversing valve 6, finally enters the air cylinder 4 to push the piston rod 41 to act, meanwhile, clean air discharged from the air outlet A of the filtering and reducing valve 1 selectively enters the execution port B or A of the pneumatic control reversing valve after passing through the air inlet P of the pneumatic control reversing valve, the air inlet channel of the air cylinder is increased, and the air inlet speed of the air cylinder is accelerated. The internal air supply loop of the pneumatic control reversing valve 6 is switched according to the electrified or power-off condition of the electromagnetic valve 2, and meanwhile, an air source is controlled by the pneumatic control reversing valve 6 to selectively enter the two quick exhaust valves for air intake or exhaust, so that the action speed of the piston rod 41 in the air cylinder 4 is increased, and the purpose of opening or closing the valve in the shortest time is achieved.
In the embodiment, the air supply loop of the air cylinder 4 is improved and optimized by adding the pneumatic control reversing valve 6, so that the opening/closing action of the automatic control valve is completed within 5 seconds, the time of the opening or closing action of the valve is shortened, and the problem of slow opening/closing action of the automatic control valve is thoroughly solved.
In the actual production of the traditional pneumatic automatic control valve, the valve with a small diameter has the problem of the thread sliding of the cylinder body thread hole, for example, 5 DN40 pneumatic automatic control ball valves on a steam pipeline of a polymerization kettle of a PVC polymerization device have the problem of the thread sliding of the cylinder body thread hole, the valve with a large diameter has the problem of slow valve opening/closing action, for example, 5 DN150 pneumatic automatic control switch valves and 5 DN200 pneumatic automatic control ball valves on a discharge pipeline of the polymerization kettle have the problem of slow valve opening/closing action. According to the utility model discloses the valve action after the transformation is faster, more accurate, more reliable. This transformation cost is more lower than the whole valve of change relatively, and the practicality is strong, and the effect is showing in PVC polymerization facility uses, has established good basis for polymerizer's normal material of throwing, and gas circuit assembly structure is compact, assembly easy maintenance, and factor of safety is high, has reduced instrument maintenance personnel's intensity of labour, has also practiced thrift manufacturing cost, moreover thorough solution the problem of aluminium system material cylinder body installation solenoid valve silk hole smooth silk and the slow problem of valve opening/closing action. The transformation has high practicability and popularization in the same industry.
Additionally, the utility model discloses a to the pneumatic automatic control device's of valve transformation, not only be limited to the pneumatic automatic control valve who uses on the pipeline to PVC polymerization facility, also can be used to the transformation of automatic control valve on other devices, if be used for the transformation to the slow problem of DN250 pneumatic automatic control slag discharge valve opening/closing action of carbide method acetylene device generator, the valve action time after the transformation can satisfy the use of technology completely. Simultaneously, from the specialty perspective, through the utility model provides a technical scheme's transformation, the debugging of weeding, gas circuit are put into operation and have all played fine inspiration effect to instrument maintenance technical personnel.
The utility model discloses a pneumatic automatic control device creative design a compact air feed return circuit system that has buffering, fast forward and arrange three kinds of functions soon, broken the tradition that traditional pneumatic automatic control valve air feed return circuit design was unchangeable after dispatching from the factory, the increase of arranging the valve soon in the air feed return circuit has improved the exhaust velocity of cylinder widely, the increase of gas accuse switching-over valve has improved the admission speed of cylinder widely, the time of valve on/off action has been shortened, the slow problem of valve on/off action has been solved. And the electromagnetic valve is independently fixed on the steel plate instead of the cylinder body, so that the problem that the electromagnetic valve falls off from the cylinder body due to the fact that the thread of the thread hole of the cylinder body is slippery and the pipeline is vibrated greatly is solved.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (9)
1. A pneumatic automatic control device of a valve is characterized by comprising a filtering pressure reducing valve (1), an electromagnetic valve (2), two quick discharge valves (3a, 3b) and a cylinder (4),
the air inlet of the filtering and pressure reducing valve (1) is connected with an instrument air source (5), and the air outlet of the filtering and pressure reducing valve (1) is connected with the air inlet of the electromagnetic valve (2) so as to filter and reduce the pressure of the compressed air from the instrument air source (5) and send the compressed air into the electromagnetic valve (2);
the two quick discharge valves (3a, 3b) are internally provided with valve cores and comprise air inlets, execution ports and outer discharge ports, when compressed air is input into the air inlets, the valve cores are pushed to move, a passage between the air inlets and the execution ports is opened, a passage between the execution ports and the outer discharge ports is blocked, and the compressed air enters through the execution ports; when compressed air is input into the execution port, the valve core is pushed to move reversely, the passage between the air inlet and the execution port is blocked, the passage between the execution port and the outer discharge port is opened, and the compressed air is discharged through the outer discharge port;
two execution ports of the electromagnetic valve (2) are connected with air inlets of the two quick exhaust valves (3a, 3b), execution ports of the two quick exhaust valves (3a, 3b) are connected with two air ports of the air cylinder (4), and the electromagnetic valve (2) controls the telescopic motion of a piston rod (41) in the air cylinder (4) by receiving electric signals;
a piston rod (41) of the air cylinder (4) is connected with the valve so as to control the opening/closing action of the valve through the telescopic motion of the piston rod (41);
the electromagnetic valve (2) is fixed at a position outside the cylinder body of the cylinder (4).
2. Pneumatically automatic control device according to claim 1, characterized in that said solenoid valve (2) is fixed on a steel plate.
3. The pneumatic automatic control device according to claim 1, characterized in that the solenoid valve (2) is a two-position five-way single electric solenoid valve.
4. Pneumatic automatic control device according to claim 3, characterized in that the inlet of the solenoid valve (2) and the two actuation ports of the solenoid valve (2) are connected respectively
The two air ports of the cylinder (4) are respectively connected with the sleeve type straight-through joint
The ferrule type straight-through joint.
5. Pneumatic automatic control device according to claim 1, characterized in that it further comprises a pneumatic reversal valve (6), said pneumatic reversal valve (6) being mounted between said solenoid valve (2) and the two quick-release valves (3a, 3 b).
6. The pneumatic automatic control device according to claim 5, characterized in that two execution ports of the electromagnetic valve (2) are connected with two control ports of the pneumatic control reversing valve (6), two execution ports of the pneumatic control reversing valve (6) are connected with air inlets of two quick exhaust valves (3a, 3b), and an air inlet of the pneumatic control reversing valve (6) and an air inlet of the electromagnetic valve (2) are respectively connected with an air outlet of the filtering and reducing valve (1).
7. The pneumatic automatic control device according to claim 6, characterized in that the air inlet, the two control ports and the two execution ports of the pneumatic reversing valve (6) are respectively connected with
The ferrule type straight-through joint.
8. Pneumatic automatic control device according to claim 7, characterized in that the pneumatically controlled directional valve (6) is a pressure-controlled directional valve.
9. Pneumatic automatic control device according to claim 6, characterized in that the air outlet of the filtering and pressure reducing valve (1) is connected with
The ferrule type three-way joint.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920877690.7U CN210484760U (en) | 2019-06-12 | 2019-06-12 | Pneumatic automatic control device of valve |
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| CN201920877690.7U CN210484760U (en) | 2019-06-12 | 2019-06-12 | Pneumatic automatic control device of valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879491A (en) * | 2020-08-18 | 2020-11-03 | 中机寰宇(山东)车辆认证检测有限公司 | Short-stroke half-sine wave impact test stand |
| CN113433066A (en) * | 2021-06-28 | 2021-09-24 | 江西人民输变电有限公司 | Inside gaseous detecting system of switch board |
| CN115140634A (en) * | 2022-06-24 | 2022-10-04 | 天津市迅尔自控设备制造有限公司 | Cylinder self-locking device, lifter and control method |
-
2019
- 2019-06-12 CN CN201920877690.7U patent/CN210484760U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879491A (en) * | 2020-08-18 | 2020-11-03 | 中机寰宇(山东)车辆认证检测有限公司 | Short-stroke half-sine wave impact test stand |
| CN113433066A (en) * | 2021-06-28 | 2021-09-24 | 江西人民输变电有限公司 | Inside gaseous detecting system of switch board |
| CN113433066B (en) * | 2021-06-28 | 2024-01-30 | 江西人民输变电有限公司 | Gas detection system in power distribution cabinet |
| CN115140634A (en) * | 2022-06-24 | 2022-10-04 | 天津市迅尔自控设备制造有限公司 | Cylinder self-locking device, lifter and control method |
| CN115140634B (en) * | 2022-06-24 | 2024-05-03 | 天津思睿德自动化科技有限公司 | Cylinder self-locking device, lifter and control method |
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