CN210599636U - Automatic change valve - Google Patents
Automatic change valve Download PDFInfo
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- CN210599636U CN210599636U CN201921701463.5U CN201921701463U CN210599636U CN 210599636 U CN210599636 U CN 210599636U CN 201921701463 U CN201921701463 U CN 201921701463U CN 210599636 U CN210599636 U CN 210599636U
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Abstract
The utility model provides an automatic reversing valve relates to the valve body field. The automatic direction changing valve includes: the main valve is a three-position five-way double control valve, a first inflow port, a first outflow port, a second outflow port, a first control port and a second control port are arranged on the main valve, the first inflow port is used for being communicated with a fluid source, the first outflow port is used for being connected with one air inlet on the air cylinder, and the second outflow port is used for being connected with the other air inlet on the cylinder body; the pilot valve is a two-position five-way single control valve, a second inflow port, a third outflow port, a fourth outflow port and a third control port are arranged on the pilot valve, the second inflow port is communicated with the first inflow port, the third outflow port is communicated with the first control port, the fourth outflow port is communicated with the second control port, and the third control port is communicated with the first outflow port. The automatic reversing valve can simplify the control mode of the air cylinder.
Description
Technical Field
The utility model relates to a valve body field particularly, relates to an automatic reversing valve.
Background
In modern industrial automation equipment, air cylinders are generally used, the control of the air cylinders is generally controlled in a mode of driving an electromagnetic directional valve, the control needs electrical participation, transmitter equipment such as pressure signal detection or position detection of a travel switch or a proximity switch or a magnetic switch and the like needs to be utilized in the using process, automatic control is realized under the cooperation of a computer PLC program or a single chip microcomputer program, and the control mode is complex.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an automatic reversing valve for need not automatically controlled participation and can realize the automatic continuous switching-over control of cylinder (except that single-action spring reset cylinder).
The embodiment of the utility model is realized like this:
an automatic reversing valve comprising:
the main valve is a three-position five-way double control valve and is provided with a first inflow port, a first outflow port, a second outflow port, a first control port and a second control port, the first inflow port is communicated with a fluid source, the first outflow port is used for being connected with one inflow port in the cylinder body, and the second outflow port is used for being connected with the other inflow port in the cylinder body;
the main valve has a first operating position in which the first inlet and outlet ports are in communication and has a second operating position in which the first inlet and outlet ports are in communication and an intermediate position in which neither the first inlet nor the first outlet nor the second outlet port is in communication;
when the first control port is active, the main valve is in the first operating position;
when the second control port is active, the main valve is in the second operating position;
the pilot valve is a two-position five-way single control valve, the pilot valve is provided with a second inflow port, a third outflow port, a fourth outflow port and a third control port, the second inflow port is communicated with the first inflow port, the third outflow port is communicated with the first control port, the fourth outflow port is communicated with the second control port, and the third control port is communicated with the first outflow port;
the pilot valve is provided with a third working position for communicating the second flow inlet with the third flow outlet and a fourth working position for communicating the second flow inlet with the fourth flow outlet;
when the pressure of the third control port is smaller than the inherent thrust of the pilot valve, the pilot valve is in the third working position;
when the pressure of the third control port is greater than the inherent thrust of the pilot valve, the pilot valve is in the fourth operating position.
In a preferred embodiment of the present invention, the fluid throttling device further comprises a first one-way throttling valve, the first one-way throttling valve is disposed on the channel between the third control port and the first outflow port, and the first one-way throttling valve is used for throttling the fluid flowing from the third control port to the first outflow port.
In the preferred embodiment of the present invention, the fluid throttling device further comprises a second one-way throttling valve, the second one-way throttling valve is disposed on the third control port and the channel between the first outlets, and the second one-way throttling valve is used for throttling the fluid flowing from the first outlets to the third control port.
In a preferred embodiment of the present invention, the main valve is a three-position five-way double control valve.
In a preferred embodiment of the present invention, the pilot valve is a two-position five-way single control valve.
In a preferred embodiment of the present invention, the fluid source is in communication with the first inlet.
In a preferred embodiment of the present invention, a control valve is disposed between the fluid source and the first inlet, and the control valve is used for controlling whether the fluid source and the first inlet are communicated with each other.
The embodiment of the utility model provides a beneficial effect is: when the valve is operated, gas flows into the main valve and the pilot valve through the first inflow port and the second inflow port simultaneously; in the main valve, at the moment of ventilation, because the first control port and the second control port of the main valve do not have compressed air to enter, the valve core of the main valve is in a middle position; in the pilot valve, because of the inherent thrust action of the pilot valve, the pilot valve is kept at a third working position, gas firstly enters a first control port of a main valve through a third outlet, a second control port of the main valve is communicated with the atmosphere through the pilot valve (zero pressure state), the air pressure of the first control port is larger than the air pressure of the second control port, under the push of compressed air of the first control port, a valve core of the main valve moves to the left, the valve core of the main valve is at the first working position, the compressed air enters the main valve through a first inlet of the main valve, enters one air inlet 1 of an air cylinder from a first outlet of the main valve, the other air inlet 2 of the air cylinder is communicated with the atmosphere through the main valve, a piston of the air cylinder moves to one direction (assuming right movement), meanwhile, the compressed air is output from the first outlet of the main valve, is conveyed to a third control port of the pilot valve through a one, driving a corresponding control piston to push a valve core of the pilot valve, overcoming the inherent thrust of the pilot valve, moving the valve core of the pilot valve to the right, controlling the moving speed by a second one-way throttle valve, moving for a certain distance (the designed and determined pilot valve reversing distance), reversing by the pilot valve, and entering a fourth working position; when the pilot valve is at a fourth working position, the compressed air enters the second flow inlet of the pilot valve for compression control, is output from the fourth outlet of the pilot valve and enters the second control port of the main valve, the first control port of the main valve is communicated with the third flow outlet of the pilot valve, and is communicated with the atmosphere through the pilot valve (zero pressure state), at the moment, the air pressure of the second control port is larger than the air pressure of the first control port, under the pushing of the compressed air of the second control port, the valve core of the main valve moves to the right, and the valve core of the main valve is switched to the second working position; when the main valve is at the second working position, the compressed air entering the main valve from the first inlet of the main valve is output from the second outlet of the main valve and enters the other inlet 2 of the cylinder, at this time, the inlet 1 of the cylinder is communicated with atmosphere through the main valve, the piston of the cylinder moves to the other direction (assuming left movement), at the same time, the third control port of the pilot valve is communicated with atmosphere through the first outlet of the main valve, and the valve core of the pilot valve moves to the left under the inherent thrust action to push the control piston of the pilot valve to move to the left, the left movement speed is controlled by the first one-way throttle valve, the pilot valve moves for a certain distance (the designed and determined. At the moment, the pilot valve returns to the third working position again, the main valve is driven to return to the first working position, and the circulation is repeated, so that the automatic reversing control of the air cylinder can be realized, the whole process does not need electric control, pressure signal detection or equipment such as a signal transmitter is not needed, and the control mode is simple.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an automatic reversing valve provided by an embodiment of the present invention.
Icon: 110-a main valve; 111-a first inflow; 112-a first outflow port; 113-a second outflow port; 114-a second control port; 115-a first control port; 120-a pilot valve; 121-a second inflow; 122-a third stream outlet; 123-a fourth outflow; 124-a third control port; 130-a first one-way throttle valve; 140-second one-way throttle valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
Examples
The present embodiment provides an automatic direction valve, referring to fig. 1, the automatic direction valve includes:
the main valve 110 is a three-position five-way double control valve, the main valve 110 is provided with a first inflow port 111, a first outflow port 112, a second outflow port 113, a first control port 115 and a second control port 114, the first inflow port 111 is used for being communicated with a fluid source, the first outflow port 112 is used for being connected with one inflow port on the cylinder body, and the second outflow port 113 is used for being connected with the other inflow port on the cylinder body;
the main valve 110 has a first operating position in which the first inlet 111 and the first outlet 112 communicate and has a second operating position in which the first inlet 111 and the second outlet 113 communicate and an intermediate position in which neither the first inlet 111 nor the first outlet 112 nor the second outlet 113 communicate;
when the first control port 115 is active, the main valve 110 is in the first operating position;
when the second control port 114 is active, the main valve 110 is in the second operating position;
when neither the first control port 115 nor the second control port 114 is active, the main valve 110 is in the neutral position;
the pilot valve 120 is a two-position five-way single control valve, the pilot valve 120 is provided with a second inflow port 121, a third outflow port 122, a fourth outflow port 123 and a third control port 124, the second inflow port 121 is communicated with the first inflow port 111, the third outflow port 122 is communicated with the first control port 115, the fourth outflow port 123 is communicated with the second control port 114, and the third control port 124 is communicated with the first outflow port 112;
the pilot valve 120 has a third operating position where the second inlet 121 and the third outlet 122 are communicated with each other and has a fourth operating position where the second inlet 121 and the fourth outlet 123 are communicated with each other;
when the pressure of the third control port 124 is less than the inherent thrust of the pilot valve 120, the pilot valve 120 is in a third operating position;
when the pressure of the third control port 124 is greater than the inherent thrust of the pilot valve 120, the pilot valve 120 is in the fourth operating position.
In operation, gas flows into the main valve 110 and the pilot valve 120 through the first and second inlets 111 and 121 simultaneously; in the main valve 110, at the moment of venting, since no compressed air enters the first control port 115 and the second control port 114 of the main valve 110, the main valve 110 spool is in the intermediate position; in the pilot valve 120, due to the inherent thrust action of the pilot valve 120, the pilot valve 120 is maintained at the third operation position, the gas first enters the first control port 115 of the main valve 110 through the third flow outlet 122, the second control port 114 of the main valve 110 is communicated with the atmosphere through the pilot valve 120 (zero pressure state), at this time, the gas pressure of the first control port 115 is greater than the gas pressure of the second control port 114, the spool of the main valve 110 is moved to the left by the compressed air of the first control port 115, the spool of the main valve 110 is at the first operation position, the compressed air enters the main valve 110 through the first flow inlet 111 of the main valve 110, enters one intake port of the cylinder from the first flow outlet 112 of the main valve 110, the other intake port of the cylinder is communicated with the atmosphere through the main valve 110, the piston of the cylinder is moved in one direction (assuming right movement), and at the same time, the compressed air is output from the first flow outlet 112 of the main valve 110 and is delivered to the third control port, the compressed air entering the third control port 124 of the pilot valve 120 drives the corresponding control piston to push the valve element of the pilot valve 120, so as to overcome the inherent thrust of the pilot valve 120, the valve element of the pilot valve 120 moves rightwards, the moving speed is controlled by the second one-way throttle valve 140, the valve element moves for a certain distance (the designed and determined reversing distance of the pilot valve 120), the pilot valve 120 realizes reversing, and the pilot valve 120 enters a fourth working position; when the pilot valve 120 is at the fourth operating position, the compressed air entering the second inlet port 121 of the pilot valve 120 is output from the fourth outlet port 123 of the pilot valve 120 and enters the second control port 114 of the main valve 110, the first control port 115 of the main valve 110 is connected with the third outlet port 122 of the pilot valve 120, and is connected with the atmosphere through the pilot valve 120 (zero pressure state), and at this time, the air pressure of the second control port 114 is greater than the air pressure of the first control port 115, and the valve core of the main valve 110 moves to the right under the push of the compressed air of the second control port 114, and the valve core of the main valve 110 is switched to the second operating position; when the main valve 110 is in the second operating position, the compressed air entering the main valve 110 from the first inlet 111 of the main valve 110 is output from the second outlet 113 of the main valve 110 and enters the other inlet of the cylinder, at this time, the inlet of the cylinder is communicated with the atmosphere through the main valve 110, the piston of the cylinder moves to the other direction (assuming left shift), meanwhile, the third control port 124 of the pilot valve 120 is communicated with the atmosphere through the first outlet 112 of the main valve 110, the spool of the pilot valve 120 moves to the left under the inherent thrust to push the control piston of the pilot valve 120 to move to the left, the left shift speed is controlled by the first one-way throttle valve 130, the pilot valve 120 moves a certain distance, namely, the designed pilot valve 120 reversing distance, and the. At this time, the pilot valve 120 returns to the third working position again, drives the main valve 110 to return to the first working position, and reciprocates in a circulating manner, so that the automatic reversing control of the cylinder can be realized, the whole process does not need electrical control, and pressure signal detection or signal transmitter and other equipment do not need to be used, and the control mode is simple.
It is noted that in this embodiment, this control method can be used for the control of a gaseous or liquid medium.
It should be noted that in the present embodiment, a return spring is used in the pilot valve 120 to provide the return force, and therefore, the inherent thrust of the pilot valve 120 is the return force of the return spring in the pilot valve 120. Of course, in other embodiments, a magnetic force or other form of force may be used within the pilot valve 120 to provide the restoring force, where the inherent thrust of the pilot valve 120 is the magnetic force or other form of restoring force in the pilot valve 120.
Optionally, in this embodiment, a first one-way throttle valve 130 is further included, the first one-way throttle valve 130 is disposed on a passage between the third control port 124 and the first outflow port 112, and the first one-way throttle valve 130 is used for throttling the fluid flowing from the third control port 124 to the first outflow port 112.
The control of the flow rate of fluid from the third control port 124 to the first outlet port 112 may be accomplished using the first one-way throttle valve 130, which may allow for adjustment of the speed at which the pilot valve 120 transitions from the fourth operating position to the third operating position.
Optionally, in this embodiment, a second one-way throttle valve 140 is further included, the second one-way throttle valve 140 is disposed on a passage between the third control port 124 and the first outlet port 112, and the second one-way throttle valve 140 is configured to throttle the fluid flowing from the first outlet port 112 to the third control port 124.
The control of the flow rate of fluid from the first outlet port 112 to the third control port 124 may be accomplished using the second one-way throttle valve 140, which may allow for adjustment of the rate at which the pilot valve 120 transitions from the third operating position to the fourth operating position.
With the separate control of the first check throttle valve 130 and the second check throttle valve 140, the adjustment of the cylinder operation frequency can be achieved, and the ratio of the extension speed and the shortening speed can be adjusted, and the control of the cylinder operation can be better achieved.
Optionally, in this embodiment, the main valve 110 is a three-position five-way double control valve.
The flowing medium of the pneumatic control valve is gas, and the pneumatic control valve is used as the main valve 110, so that the cylinder can be better controlled.
Optionally, in this embodiment, the pilot valve 120 is a two-position five-way single control valve.
The flowing medium of the pneumatic control valve is gas, and the pneumatic control valve is used as the pilot valve 120, so that the cylinder can be better controlled.
Of course, it should be noted that in the case of driving the cylinders, it is necessary to adjust the main valve 110 to be a three-position four-way double pilot operated valve and the pilot valve 120 to be a two-position four-way single pilot operated valve.
Optionally, in this embodiment, a fluid source is further included, and the fluid source is communicated with the first inflow port 111.
The supply of fluid may be accomplished by a fluid source, which in this embodiment is provided as a source of air, a source of shop compressed air (supplied by an air compressor).
Optionally, in this embodiment, a control valve is disposed between the fluid source and the first inlet 111, and the control valve is used to control whether the fluid source and the first inlet 111 are communicated.
Whether the fluid is communicated with the first inflow port 111 or not can be controlled by the control valve, so that whether the fluid flows into the first inflow port 111 or not can be controlled.
Of course, since the first inflow port 111 and the second inflow port 121 are communicated, when the fluid source is communicated with the first inflow port 111, the fluid source is simultaneously communicated with the second inflow port 121; when the fluid source and the first inlet 111 are closed, the fluid source and the second inlet 121 are also closed.
In operation, gas flows into the main valve 110 and the pilot valve 120 through the first and second inlets 111 and 121 simultaneously; in the main valve 110, at the moment of venting, since no compressed air enters the first control port 115 and the second control port 114 of the main valve 110, the main valve 110 spool is in the intermediate position; in the pilot valve 120, due to the inherent thrust action of the pilot valve 120, the pilot valve 120 is maintained at the third operation position, the gas first enters the first control port 115 of the main valve 110 through the third flow outlet 122, the second control port 114 of the main valve 110 is communicated with the atmosphere through the pilot valve 120 (zero pressure state), at this time, the gas pressure of the first control port 115 is greater than the gas pressure of the second control port 114, the spool of the main valve 110 is moved to the left by the compressed air of the first control port 115, the spool of the main valve 110 is at the first operation position, the compressed air enters the main valve 110 through the first flow inlet 111 of the main valve 110, enters one intake port of the cylinder from the first flow outlet 112 of the main valve 110, the other intake port of the cylinder is communicated with the atmosphere through the main valve 110, the piston of the cylinder is moved in one direction (assuming right movement), and at the same time, the compressed air is output from the first flow outlet 112 of the main valve 110 and is delivered to the third control port, the compressed air entering the third control port 124 of the pilot valve 120 drives the corresponding control piston to push the valve element of the pilot valve 120, so as to overcome the inherent thrust of the pilot valve 120, the valve element of the pilot valve 120 moves rightwards, the moving speed is controlled by the second one-way throttle valve 140, the valve element moves for a certain distance, namely, the reversing distance of the pilot valve 120 is determined, the pilot valve 120 realizes the reversing and enters a fourth working position; when the pilot valve 120 is at the fourth operating position, the compressed air entering the second inlet port 121 of the pilot valve 120 is output from the fourth outlet port 123 of the pilot valve 120 and enters the second control port 114 of the main valve 110, the first control port 115 of the main valve 110 is connected with the third outlet port 122 of the pilot valve 120, and is connected with the atmosphere through the pilot valve 120 (zero pressure state), and at this time, the air pressure of the second control port 114 is greater than the air pressure of the first control port 115, and the valve core of the main valve 110 moves to the right under the push of the compressed air of the second control port 114, and the valve core of the main valve 110 is switched to the second operating position; when the main valve 110 is in the second operating position, the compressed air entering the main valve 110 from the first inlet 111 of the main valve 110 is output from the second outlet 113 of the main valve 110 and enters the other inlet of the cylinder, at this time, the inlet of the cylinder is communicated with the atmosphere through the main valve 110, the piston of the cylinder moves in the other direction (assuming a leftward movement), at the same time, the third control port 124 of the pilot valve 120 is communicated with the atmosphere through the first outlet 112 of the main valve 110, and the spool of the pilot valve 120 moves leftward under the inherent thrust to push the control piston of the pilot valve 120 to move leftward, the leftward movement speed is controlled by the first one-way throttle valve 130, the pilot valve 120 moves a certain distance (the designed pilot valve 120 reversing distance), and the. At this time, the pilot valve 120 returns to the third working position again, drives the main valve 110 to return to the first working position, and reciprocates in a circulating manner, so that the automatic reversing control of the cylinder can be realized, the whole process does not need electrical control, and pressure signal detection or signal transmitter and other equipment do not need to be used, and the control mode is simple.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An automatic reversing valve, comprising:
the main valve is a three-position five-way double control valve and is provided with a first inflow port, a first outflow port, a second outflow port, a first control port and a second control port, the first inflow port is communicated with a fluid source, the first outflow port is used for being connected with one inflow port in the cylinder body, and the second outflow port is used for being connected with the other inflow port in the cylinder body;
the main valve has a first operating position in which the first inlet and outlet ports are in communication and has a second operating position in which the first inlet and outlet ports are in communication and an intermediate position in which neither the first inlet nor the first outlet nor the second outlet port is in communication;
when the first control port is used for control, the main valve is in the first working position;
when the second control port is used for control, the main valve is in the second working position;
the pilot valve is a two-position five-way single control valve, the pilot valve is provided with a second inflow port, a third outflow port, a fourth outflow port and a third control port, the second inflow port is communicated with the first inflow port, the third outflow port is communicated with the first control port, the fourth outflow port is communicated with the second control port, and the third control port is communicated with the first outflow port;
the pilot valve is provided with a third working position for communicating the second flow inlet with the third flow outlet and a fourth working position for communicating the second flow inlet with the fourth flow outlet;
when the pressure of the third control port is smaller than the inherent thrust of the pilot valve, the pilot valve is in the third working position;
when the pressure of the third control port is greater than the inherent thrust of the pilot valve, the pilot valve is in the fourth operating position.
2. The automatic reversing valve according to claim 1, further comprising a first one-way restriction valve provided on a passage between the third control port and the first outflow port, the first one-way restriction valve being configured to restrict fluid flowing from the third control port to the first outflow port.
3. The automatic reversing valve according to claim 2, further comprising a second one-way throttle valve provided on a passage between the third control port and the first outflow port, the second one-way throttle valve being for throttle control of fluid flowing from the first outflow port to the third control port.
4. The automatic reversing valve of claim 1, wherein the primary valve is a three-position, five-way, dual pneumatic control valve.
5. The automatic reversing valve according to claim 4, wherein the pilot valve is a two-position, five-way, single pneumatic control valve.
6. The automatic reversing valve of claim 1, further comprising a fluid source in communication with the first fluid inlet.
7. The automatic reversing valve of claim 6, wherein a control valve is disposed between the fluid source and the first inlet for controlling communication between the fluid source and the first inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921701463.5U CN210599636U (en) | 2019-10-11 | 2019-10-11 | Automatic change valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921701463.5U CN210599636U (en) | 2019-10-11 | 2019-10-11 | Automatic change valve |
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| CN210599636U true CN210599636U (en) | 2020-05-22 |
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| CN201921701463.5U Active CN210599636U (en) | 2019-10-11 | 2019-10-11 | Automatic change valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578728A (en) * | 2019-10-11 | 2019-12-17 | 广东冠邦科技有限公司 | Automatic change valve |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578728A (en) * | 2019-10-11 | 2019-12-17 | 广东冠邦科技有限公司 | Automatic change valve |
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