Pneumatic reversing valve

Abstract

A reversing cavity is formed in a valve body, a reversing valve element is arranged in the reversing cavity, a first push rod is arranged on one side of the valve body, a second push rod is arranged on the other side of the valve body, the valve body is provided with a first pressure relief exhaust port and a second pressure relief exhaust port corresponding to the first push rod and the second push rod respectively, and a first channel and a second channel are formed in the valve body. A first quick exhaust valve is arranged in the first channel, a second quick exhaust valve is arranged in the second channel, a main air source inlet is formed outside the valve body, the main air source inlet is communicated with the reversing cavity, the pistons are used for pushing the corresponding push rods, the push rods push the valve element to switch the direction, and therefore continuous movement of the left piston and the right piston is achieved. By means of the reversing cavity, the push rod driving mechanism, the quick exhaust valve and the clear air source inlet and outlet channel layout, efficient control over the flow direction of fluid is achieved, meanwhile, it is guaranteed that excessive air can be quickly exhausted in the reversing process, pressure loss is reduced, and the working efficiency and stability of the whole system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reversing valve, more specifically, especially relates to a pneumatic reversing valve. BACKGROUND

[0002] In the field of modern industrial automation, especially in the field of pneumatic control technology, the reversing valve is one of the key components, used to control the flow of gas to achieve the reciprocating motion of the cylinder, the reversing valve is a directional control valve with two or more flow forms and two or more gas ports, which is used to realize the communication, cut-off and reversing of compressed air flow, as well as pressure relief and sequential action control, widely used in industrial production field, the reversing valve is a key control element, used to change the flow direction of fluid (liquid or gas), so as to realize the forward and reverse control of the actuator (such as cylinder, motor, etc.). Although the traditional reversing valve design can meet the basic reversing requirements, there are certain limitations in fast response, accurate control and system safety.

[0003] Specifically, the traditional reversing valve may face the following problems:

[0004] 1. Slow response speed: In some application scenarios that require fast response, the internal structure of the traditional reversing valve may cause the fluid switching to be not fast enough, affecting the dynamic performance of the overall system.

[0005] 2. Poor exhaust: During the reversing process, if the exhaust channel is not reasonably designed, back pressure may be generated, affecting the normal opening and closing of the valve and the rapid action of the actuator, and even may cause system pressure fluctuation.

[0006] 3. Insufficient safety: Lack of effective pressure relief mechanism, once the internal pressure of the system abnormally rises, may damage the equipment or cause safety hazards.

[0007] 4. Complex structure, inconvenient maintenance: Some traditional reversing valves have complex structure, which not only increases the manufacturing cost, but also brings inconvenience to the later maintenance and repair. INVENTION CONTENTS

[0008] The utility model improves the prior art in view of the above-mentioned shortcomings, and provides a pneumatic reversing valve, the technical scheme is as follows:

[0009] The utility model provides a kind of pneumatic reversing valve, including valve body and piston rod through the middle part of the valve body, one side of the valve body is connected with left cylinder, the other side of the valve body is connected with right cylinder, the piston rod is connected with left piston corresponding left cylinder, the piston rod is connected with right piston corresponding right cylinder, reversing cavity is arranged in the valve body, reversing valve core is arranged in the reversing cavity, the one side of the valve body is provided with first push rod, the other side is provided with second push rod, the first pressure relief exhaust port is opened in the first push rod corresponding the valve body outside, the first channel is set in the first push rod corresponding the valve body inside, the first quick exhaust valve is arranged in the first channel, the second pressure relief exhaust port is opened in the second push rod corresponding the valve body outside, the second channel is set in the second push rod corresponding the valve body inside, the second quick exhaust valve is arranged in the second channel, main gas source inlet is opened in the valve body, the main gas source inlet is communicated with the reversing cavity, the first channel is communicated with the right cylinder by first gas channel in one side, the second channel is communicated with the left cylinder by second gas channel in one side.

[0010] Preferably, the valve body inside corresponding the main gas source inlet is connected with air inlet adjusting mechanism, the main gas source inlet is provided with gas source air inlet groove, the air inlet adjusting mechanism includes adjusting valve core, the adjusting valve core is provided with through hole for air inlet, and the improved air pressure between the through hole and the gas source air inlet groove is adjusted by the axial movement of the adjusting valve core.

[0011] Preferably, the middle part of the adjusting valve core is movably provided with air stop valve rod, and the air stop valve rod is used to block the air inlet of the reversing cavity.

[0012] Preferably, the valve body is connected with end cover corresponding the first push rod and the second push rod respectively, the end cover is provided with push rod cavity, the end cover is provided with exhaust port for communication between push rod cavity and the outside of end cover, the first pressure relief exhaust port is communicated with one end of the reversing cavity, the second pressure relief exhaust port is communicated with the other end of the reversing cavity, and the first push rod and the second push rod are movably inserted into corresponding end cover respectively.

[0013] Preferably, the first channel and the second channel are both in ladder-shaped structure, the first plug is arranged between the first quick exhaust valve and the first channel, and the second plug is arranged between the second quick exhaust valve and the second channel.

[0014] Preferably, the first plug switches the conduction or disconnection of the first channel and the first gas channel, and the first plug switches the conduction or disconnection of the first quick exhaust valve or the first gas channel.

[0015] Preferably, the second plug switches the conduction or disconnection of the second channel and the second gas channel, and the second plug switches the conduction or disconnection of the second quick exhaust valve or the second gas channel.

[0016] Preferably, the valve body is connected with a pressure regulating valve at one end of the regulating valve core.

[0017] Compared with the prior art, the utility model discloses the beneficial effects are: the utility model discloses the corresponding push rod is pushed to push rod push valve core switching direction, thereby realizing the continuous movement of left piston and right piston, through the reversing cavity, push rod drive mechanism, quick exhaust valve and definite gas source import and export passage layout, realize the efficient control to the fluid flow direction, guarantee simultaneously in the reversing process can discharge the surplus gas quickly, reduce the pressure loss, improve the working efficiency and stability of whole system. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduce:

[0019] Figure 1 It is the perspective view of the utility model;

[0020] Figure 2 It is the implementation view of the utility model;

[0021] Figure 3 It is the first passage section view of the utility model Figure 1 ;

[0022] Figure 4 It is the second passage section view of the utility model;

[0023] Figure 5 It is the gas intake regulating mechanism section view of the utility model;

[0024] Figure 6 It is the first passage section view of the utility model Figure 2 ;

[0025] Figure 7 It is the end cover perspective view of the utility model;

[0026] Including: 1, valve body;2, piston rod;3, left cylinder body;4, right cylinder body;5, left piston;6, right piston;7, reversing cavity;8, reversing valve core;9, first push rod;10, second push rod;11, first pressure relief exhaust port;12, first passage;13, first quick exhaust valve;14, second pressure relief exhaust port;15, second passage;16, second quick exhaust valve;17, main gas source import;18, gas intake regulating mechanism;19, regulating valve core;20, through hole;21, gas stop valve rod;22, end cover;23, first plug;24, second plug;25, gas source gas intake groove;26, first gas channel;27, second gas channel;28, push rod cavity;29, exhaust port. DETAILED DESCRIPTION

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings, as follows:

[0029] like Figures 1 to 6 The pneumatic directional valve shown includes a valve body 1 and a piston rod 2 passing through the middle of the valve body 1. A left cylinder 3 is connected to one side of the valve body 1, and a right cylinder 4 is connected to the other side of the valve body 1. A left piston 5 is connected to the left cylinder 3, and a right piston 6 is connected to the right cylinder 4. A directional valve chamber 7 is provided inside the valve body 1. The piston rod 2 drives the left piston 5 and the right piston 6 to slide in the left cylinder 3 and the right cylinder 4, respectively. A directional valve core 8 is provided in the directional valve chamber 7. A first push rod 9 is provided on one side of the valve body 1, and a second push rod 10 is provided on the other side. When the left piston 5 or the right piston 6 moves towards the valve body 1, the side of the left piston 5 or the right piston 6 impacts the end of the first push rod 9 or the second push rod 10, causing the directional valve core 8 to be displaced. The first push rod 9 and the second push rod 10 are respectively located at one end of the directional valve chamber 7, and sealing rings are connected to the contact points of the directional valve chamber 7. The two ends of the directional valve core 8 are respectively connected to the contact points of the directional valve chamber 7. A sealing ring is provided to ensure airtightness. The connection structure of the sealing ring is easily conceived by those skilled in the art in the field of cylinders and will not be described in detail here. A first pressure relief exhaust port 11 is provided on the outside of the valve body 1 corresponding to the first push rod 9. A first channel 12 is provided inside the valve body 1 corresponding to the first push rod 9. A first quick exhaust valve 13 is provided in the first channel 12. A second pressure relief exhaust port 14 is provided on the outside of the valve body 1 corresponding to the second push rod 10. A second channel 15 is provided inside the valve body 1 corresponding to the second push rod 10. A second quick exhaust valve 16 is provided in the second channel 15. A main air source inlet 17 is provided on the outside of the valve body 1. The main air source inlet 17 is connected to the reversing chamber 7. The main air source inlet 17 is connected to an external air source. High-pressure gas from the air source enters the reversing chamber 7 through the main air source inlet 17. One side of the first channel 12 is connected to the right cylinder 4 through the first air passage 26. One side of the second channel 15 is connected to the left cylinder 3 through the second air passage 27.

[0030] With the working principle combined with the above structure as an example, when the high-pressure gas of the gas source enters the reversing cavity 7 through the main gas source inlet 17, the reversing cavity 7 gas source passes through the first channel 12, the first plug 23 blocks the first rapid exhaust valve 13, the first rapid exhaust valve 13 is disconnected, the first channel 12 gas source enters the first gas channel 26, the first gas channel 26 positive pressure enters the right cylinder body 4, the first pressure relief exhaust port 11 is relieved; the right piston 6 in the right cylinder body 4 is pushed by the positive pressure, the left piston 5 moves towards the valve body 1, the gas in the left cylinder body 3 enters through the second gas channel 27, the second plug 24 moves towards the second channel 15, the second rapid exhaust valve 16 is opened, the second channel 15 is blocked, the gas is discharged through the second rapid exhaust valve 16, when the left piston 5 pushes the first push rod 9 to the end, the first push rod 9 pushes the reversing valve core 8 towards the second push rod 10, the second push rod 10 blocks the second pressure relief exhaust port 14, the reversing valve core 8 is pushed to the gas inlet direction of the reversing cavity 7, the gas pressure of the reversing cavity 7 is blocked, the gas pressure pushes the reversing valve core 8 to the position of the second push rod 10, the second plug 24 blocks the second rapid exhaust valve 16, the cylinder pressure pushes the reversing valve core 8 to the second channel 15; the reversing cavity 7 gas source enters through the second channel 15, the first push rod 9 is no longer pushed by the piston, the first push rod 9 resets, the in-cylinder gas pressure pushes the second push rod 10 away through the reversing cavity 7 at the same time, the second pressure relief exhaust port 14 is relieved, the second channel 15 is opened, the gas in the reversing cavity 7 is discharged through the second channel 15 and the second pressure relief exhaust port 14 in turn;

[0031] When the high-pressure gas of the gas source enters the reversing cavity 7 through the main gas source inlet 17, the second plug 24 blocks the second quick exhaust valve 16 through the second channel 15, the second quick exhaust valve 16 is disconnected, the gas source of the second channel 15 enters the second gas channel 27, the positive pressure of the second gas channel 27 enters the left cylinder body 3, and the second pressure relief exhaust port 14 is relieved; the left piston 5 in the left cylinder body 3 is pushed by the positive pressure, the right piston 6 moves towards the valve body 1, the gas in the right cylinder body 4 enters through the second gas channel 27, the second plug 24 is moved towards the first channel 12, the second quick exhaust valve 16 is opened, the second channel 15 is blocked, and the gas is exhausted through the second quick exhaust valve 16; when the right piston 6 pushes the second push rod 10 to the end, the second push rod 10 pushes the reversing valve core 8 towards the first push rod 9, the first push rod 9 blocks the first pressure relief exhaust port 13, the reversing valve core 8 is pushed to the gas inlet direction of the reversing cavity 7, the gas pressure of the reversing cavity 7 is blocked, the gas pressure pushes the reversing valve core 8 to the position of the first push rod 9, the first plug 23 blocks the first quick exhaust valve 13, and the cylinder pressure pushes the reversing valve core 8 to the first channel 12.

[0032] The utility model discloses a piston push corresponding push rod, make push rod push reversing valve core 8 switch direction, thereby realize left piston 5 and right piston 6's continuous movement, through reversing cavity 7, push rod drive mechanism, quick exhaust valve and definite gas source import and export channel layout, realized to the high -efficient control of fluid flow, can discharge redundant gas quickly in the reversing process simultaneously, reduce pressure loss, improve the working efficiency and stability of whole system.

[0033] Preferably, the valve body 1 is connected with an air inlet adjusting mechanism 18 corresponding to the main gas source inlet 17, the main gas source inlet 17 is provided with a gas inlet groove 25, the air inlet adjusting mechanism 18 comprises an adjusting valve core 19, the adjusting valve core 19 is provided with a through hole 20 for air inlet, and the improved air pressure between the through hole 20 and the gas inlet groove 25 is adjusted through the axial movement of the adjusting valve core 19, and the valve body 1 is connected with a pressure regulating valve at one end of the adjusting valve core 19.

[0034] Preferably, the middle part of the adjusting valve core 19 is movably provided with a gas stop valve rod 21, the gas stop valve rod 21 is used for blocking the air inlet of the reversing cavity 7 inlet, the main gas source inlet 17 can no longer input high-pressure gas, the piston rod 2 stops moving, the positive pressure in the cylinder body is balanced with the vacuum, and the vacuum state on the clamp can be effectively maintained.

[0035] Preferably, the valve body 1 is connected with end caps 22 corresponding to the first push rod 9 and the second push rod 10 respectively, the end caps 22 are provided with push rod cavities 28 for axial movement of the first push rod 9 / second push rod 10, the end caps 22 are provided with exhaust ports 29 for communication between the push rod cavities 28 and the outside of the end caps, the first pressure relief exhaust port is communicated with one end of the reversing cavity 7, the exhaust port 29 can be blocked by the first push rod 9 / second push rod 10, the second pressure relief exhaust port 14 is communicated with the other end of the reversing cavity 7, and the first push rod 9 and the second push rod 10 are movably inserted into the corresponding end caps 22.

[0036] Preferably, the first channel 12 and the second channel 15 are both in a stepped structure, the first plug 23 is arranged between the first rapid exhaust valve 13 and the first channel 12, and the second plug 24 is arranged between the second rapid exhaust valve 16 and the second channel 15.

[0037] Preferably, the first plug 23 switches the conduction or disconnection between the first channel 12 and the first air passage 26, and the first plug 23 switches the conduction or disconnection between the first rapid exhaust valve 13 or the first air passage 26.

[0038] Preferably, the second plug 24 switches the conduction or disconnection between the second channel 15 and the second air passage 27, and the second plug 24 switches the conduction or disconnection between the second rapid exhaust valve 16 or the second air passage 27.

[0039] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and deformations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A pneumatic reversing valve comprising a valve body and a piston rod penetrating through the middle of the valve body, one side of the valve body being connected with a left cylinder body, the other side of the valve body being connected with a right cylinder body, the piston rod being connected with a left piston corresponding to the left cylinder body, and the piston rod being connected with a right piston corresponding to the right cylinder body, characterized in that, The valve body has a reversing chamber inside, and a reversing valve core is installed in the reversing chamber. A first push rod is installed on one side of the valve body, and a second push rod is installed on the other side. A first pressure relief exhaust port is opened on the outside of the valve body corresponding to the first push rod. A first channel is provided inside the valve body corresponding to the first push rod, and a first quick exhaust valve is installed in the first channel. A second pressure relief exhaust port is opened on the outside of the valve body corresponding to the second push rod. A second channel is provided inside the valve body corresponding to the second push rod, and a second quick exhaust valve is installed in the second channel. A main air source inlet is opened on the outside of the valve body and is connected to the reversing chamber. One side of the first channel is connected to the right cylinder block through a first air passage, and one side of the second channel is connected to the left cylinder block through a second air passage.

2. A pneumatic directional control valve according to claim 1, characterised in that An air intake regulating mechanism is connected inside the valve body corresponding to the main air source inlet. The main air source inlet has an air source inlet slot. The air intake regulating mechanism includes a regulating valve core. The regulating valve core is provided with a through hole for air intake. The axial movement of the regulating valve core adjusts the improved air pressure between the through hole and the air source inlet slot.

3. A pneumatic directional control valve according to claim 2, characterised in that A stop valve rod is movably inserted through the middle of the regulating valve core. The stop valve rod is used to block the air intake of the reversing chamber.

4. A pneumatic directional control valve according to claim 1, characterized in that The valve body is connected to end caps corresponding to the first push rod and the second push rod, respectively. The end cap is provided with a push rod cavity and an exhaust port that connects the push rod cavity to the outside of the end cap. The first pressure relief exhaust port is connected to one end of the reversing cavity, and the second pressure relief exhaust port is connected to the other end of the reversing cavity. The first push rod and the second push rod are respectively movably inserted into the corresponding end caps.

5. A pneumatic directional control valve according to claim 1, characterized in that Both the first channel and the second channel have a stepped structure. A first plug is provided between the first quick exhaust valve and the first channel, and a second plug is provided between the second quick exhaust valve and the second channel.

6. A pneumatic directional control valve according to claim 5, characterised in that The first plug switches the connection or disconnection between the first channel and the first air passage, and the first plug switches the connection or disconnection between the first quick exhaust valve and the first air passage.

7. A pneumatic directional control valve according to claim 5, characterised in that The second plug switches the connection or disconnection between the second channel and the second air passage, and the second plug switches the connection or disconnection between the second quick exhaust valve and the second air passage.

8. A pneumatic directional control valve according to claim 2, characterised in that The valve body is connected to a pressure regulating valve at one end of the regulating valve core.

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