Gas switching device

Abstract

The present invention discloses a gas switching device, wherein the upper and lower ends of a main valve body are respectively provided with a high-pressure gas port and a recovery gas port, and the left side surface of the main valve component is also provided with a first gas outlet and a second gas outlet respectively connected with the high-pressure gas port and the recovery gas port; the auxiliary valve component comprises an auxiliary valve body, the upper and lower parts of the auxiliary valve body are respectively provided with a first air cavity and a second air cavity, the first air cavity and the second air cavity are respectively provided with a first valve core and a second valve core, the first air cavity and the second air cavity are respectively provided with a dynamic seal with the first valve core and the second valve core in the left and right directions; a channel is provided between the main valve body and the auxiliary valve body, the upper part of the channel is connected with the first gas outlet and the first air cavity, and the lower part of the channel is connected with the second gas outlet and the second air cavity; the right ends of the first valve core and the second valve core pass through the channel to dynamically seal with the first gas outlet and the second gas outlet in the left and right directions respectively; and also include a total gas outlet, the total gas outlet transversely passes through the auxiliary valve body and is connected with the channel.

Description

Technical Field

[0001] The invention relates to the technical field of full-automatic rotary bottle blowing machines, in particular to a gas switching device. Background Art

[0002] High-pressure gas and low-pressure gas are needed in the rotary blow molding machine. For example, the second blowing process of the preform uses high-pressure gas, and the preform pre-blowing process, high-pressure valve group pilot control, stretching cylinder action, and sealing cylinder action use low-pressure gas. Currently, most rotary blow molding machines are only connected to high-pressure gas, and low-pressure gas is obtained by reducing the pressure of high-pressure gas. After the second blowing process of the preform is completed, the high-pressure gas in the bottle cavity will be recovered through the recovery valve, and the recovered gas will be reduced to obtain low-pressure gas. The production line of the rotary blow molding machine is equipped with a special device to switch high-pressure gas and low-pressure gas.

[0003] In the existing design of bottle blowing air circuit, the switching between high-pressure gas and low-pressure gas is mainly realized by a series of gas circuit components such as two-position two-way electric control valve or electric control ball valve and one-way valve. For example, the structure disclosed in the Chinese patent "CN206825895U-A high-pressure air recovery and reuse mechanism of bottle blowing machine" is as follows: the first bottle blowing unit is connected with the stretch sealing air ring; the stretch sealing air ring is connected with a low-pressure air input pipeline and a stretch sealing one-way valve in parallel; the stretch sealing one-way valve is connected with the stretch sealing pressure reducing valve; the stretch sealing pressure reducing valve is connected with a pre-blowing one-way valve and a recovery air ring in parallel; the pre-blowing one-way valve is connected with the pre-blowing pressure reducing valve; the pre-blowing pressure reducing valve is connected with a high-pressure air input solenoid valve and a pre-blowing air ring in parallel; the pre-blowing air ring and the recovery air ring are both connected with the second bottle blowing unit. The problems existing in the prior art are: the gas circuit structure is complex, occupies a large space, and is difficult to install. At the same time, the long gas circuit causes a slow response speed, which reduces the utilization rate of the recovered gas. Summary of the invention

[0004] The object of the present invention is to provide a gas switching device having the advantages of simple structure, convenient installation and maintenance, low failure rate, low cost, accurate and fast response, and high utilization rate of recycled gas.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A gas switching device comprises a main valve component and a secondary valve component which are sequentially arranged from right to left and statically sealed;

[0007] The main valve component comprises a main valve body, the upper end and the lower end of the main valve body are respectively provided with a high-pressure gas port and a recovery gas port, and the left side of the main valve component is also provided with a first gas outlet and a second gas outlet respectively connected with the high-pressure gas port and the recovery gas port;

[0008] The auxiliary valve component includes an auxiliary valve body, the upper part and the lower part of the auxiliary valve body are respectively provided with a first air cavity and a second air cavity, the first air cavity and the second air cavity are respectively provided with a first valve core and a second valve core, and the first air cavity and the second air cavity are respectively dynamically sealed with the first valve core and the second valve core in the left-right direction;

[0009] A channel is provided between the main valve body and the auxiliary valve body, the upper part of the channel is connected to the first air outlet and the first air cavity, and the lower part of the channel is connected to the second air outlet and the second air cavity; the right ends of the first valve core and the second valve core pass through the channel and are dynamically sealed with the first air outlet and the second air outlet in the left and right directions respectively;

[0010] It also includes a main air outlet, which transversely penetrates the auxiliary valve body and is communicated with the channel.

[0011] Furthermore, it also includes a cover plate, which is arranged on the left side of the auxiliary valve component and is statically sealed with the auxiliary valve component, and the upper and lower parts of the cover plate are respectively provided with a first pilot air port and a second pilot air port, and the first pilot air port and the second pilot air port are respectively connected to the first air cavity and the second air cavity; the left end of the total air outlet passes through the cover plate; the projection of the first air cavity along the left and right directions completely covers the first pilot air port, and the projection of the second air cavity along the left and right directions completely covers the second pilot air port.

[0012] Furthermore, it also includes a first sealing ring, which is arranged between the main valve body and the auxiliary valve body, and the first sealing ring is arranged on the outside of the first air outlet and the second air outlet; it also includes a fourth sealing ring, which is arranged between the auxiliary valve body and the cover plate, and the second air cavity, the first air cavity, and the outside of the main air outlet are all provided with fourth sealing rings.

[0013] Further, the length of the first valve core in the left-right direction and the length of the second valve core in the left-right direction are both smaller than the length of the auxiliary valve body in the left-right direction.

[0014] Furthermore, the cross-section of the first valve core is a transversely arranged type, the first valve core includes a cylindrical valve head and a cylindrical valve body, the valve head is arranged on the left side of the valve body, the valve head and the valve body are fixedly connected and coaxial, and the diameter of the valve head is larger than the diameter of the valve body; the cross-section of the first air cavity is a transversely arranged type, the first air cavity includes a cylindrical cavity head and a cylindrical cavity body, the cavity head is arranged on the left side of the cavity body, the cavity head and the cavity body are connected and coaxial, and the diameter of the cavity head is larger than the diameter of the cavity body; the length of the cavity head is larger than the length of the valve head, and the length of the cavity body is smaller than the length of the valve body; the second valve core has the same structure as the first valve core, and the second air cavity has the same structure as the first air cavity.

[0015] Furthermore, it also includes a second sealing ring and a third sealing ring, which are respectively arranged on the valve head and the valve body, and the second sealing ring and the third sealing ring are coaxial with the first valve core or the second valve core.

[0016] Furthermore, there are several auxiliary valve components, which are arranged in an array along the vertical axis of the main valve component; there are several first air outlets and second air outlets, which are arranged in an array along the vertical axis of the main valve component.

[0017] Further, the number of the auxiliary valve components is two, and the two auxiliary valve components are symmetrically arranged along the vertical axis of the main valve component.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention is easy to install and maintain, has a simple structure, a low failure rate, saves pneumatic components, reduces costs, has accurate and fast switching response, and has a high utilization rate of recycled gas.

[0020] 2. The present invention can allow high-pressure gas to be connected from the high-pressure gas port through the setting of the high-pressure gas port, and can allow recycled gas to be connected from the recycled gas port through the setting of the recycled gas port. Through the setting of the total gas outlet, the recycled gas can flow out for use in reducing the pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the case where the recycled gas is insufficient according to the first embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the first embodiment of the present invention when the recycled gas is sufficient;

[0023] Figure 3 This is a schematic diagram of Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 to Figure 2 , is the first embodiment of the present invention, specifically:

[0026] A gas switching device comprises a main valve component and a secondary valve component which are sequentially arranged from right to left and statically sealed;

[0027] The main valve component includes a main valve body 10, and the upper and lower ends of the main valve body 10 are respectively provided with a high-pressure gas port 11 and a recovery gas port 12, and the left side of the main valve component is also provided with a first gas outlet 110 and a second gas outlet 120 respectively connected to the high-pressure gas port 11 and the recovery gas port 12;

[0028] The auxiliary valve component includes an auxiliary valve body 30, and the upper and lower parts of the auxiliary valve body 30 are respectively provided with a first air cavity 310 and a second air cavity 320, and the first air cavity 310 and the second air cavity 320 are respectively provided with a first valve core 31 and a second valve core 32, and the first air cavity 310 and the second air cavity 320 are respectively dynamically sealed with the first valve core 31 and the second valve core 32 in the left-right direction;

[0029] A channel 61 is provided between the main valve body 10 and the auxiliary valve body 30. The upper portion of the channel 61 is communicated with the first air outlet 110 and the first air cavity 310, and the lower portion of the channel 61 is communicated with the second air outlet 120 and the second air cavity 320. The right ends of the first valve core 31 and the second valve core 32 pass through the channel 61 and are dynamically sealed with the first air outlet 110 and the second air outlet 120 in the left and right directions respectively.

[0030] The main air outlet 51 is also included. The main air outlet 51 transversely penetrates the auxiliary valve body 30 and communicates with the channel 61 .

[0031] The working process of the present invention is: high-pressure gas is connected from the high-pressure gas port 11, and the recycled gas is connected from the recycled gas port 12;

[0032] like Figure 1 , the arrow symbol in the figure indicates the direction of air flow. When the recycled air is insufficient, compressed air is introduced from the left end of the second air cavity 320, and the compressed air pushes the second valve core 32 to move forward. The right end face of the second valve core 32 presses the left end face of the main valve component to seal the second air outlet 120; the first air cavity 310 does not introduce compressed air, and the first valve core 31 moves leftward when the high-pressure gas acts on the right end face of the first valve core 31. The high-pressure gas enters the channel 61 respectively, and flows out from the main air outlet 51 for use in reducing the pressure gas;

[0033] like Figure 2 , the arrow symbol in the figure indicates the direction of air flow. When the recycled air is sufficient, the compressed air enters the first air cavity 310 respectively, and the second air cavity 320 stops entering the compressed air. Under the action of the compressed air, the first valve core 31 moves right to seal the first air outlet 110. The high-pressure air cannot enter the channel 61. Under the action of the recycled air, the second valve core 32 moves left. The recycled air enters the channel 61 and flows out from the main air outlet 51 for use in reducing the pressure.

[0034] Furthermore, it also includes a cover plate 2, which is arranged on the left side of the auxiliary valve component and is statically sealed with the auxiliary valve component. The upper and lower parts of the cover plate 2 are respectively provided with a first pilot air port 21 and a second pilot air port 22, which are respectively connected to the first air cavity 310 and the second air cavity 320; the left end of the total air outlet 51 passes through the cover plate 2; the projection of the first valve core 31 along the left and right directions completely covers the first pilot air port 21, and the projection of the second valve core 32 along the left and right directions completely covers the second pilot air port 22. The benefit of setting the cover plate 2 is that the first valve core 31 and the second valve core 32 can be restricted in the first air cavity 310 and the second air cavity 320, so as to prevent the first valve core 31 and the second valve core 32 from being separated from the first air cavity 310 and the second air cavity 320 when they move to the left under the action of the gas.

[0035] Furthermore, it also includes a first sealing ring A, which is arranged between the main valve body 10 and the auxiliary valve body 30, and the first sealing ring A is arranged outside the first air outlet 110 and the second air outlet 120; it also includes a fourth sealing ring D, which is arranged between the auxiliary valve body 30 and the cover plate 2, and the second air cavity 320, the first air cavity 310, and the outer side of the main air outlet 51 are all provided with the fourth sealing ring D. The first sealing ring A and the fourth sealing ring D can play a sealing role to avoid air pressure loss.

[0036] Furthermore, the length of the first valve core 31 in the left-right direction and the length of the second valve core 32 in the left-right direction are both smaller than the length of the auxiliary valve body 30 in the left-right direction. Since the first valve core 31 and the second valve core 32 often move left-right under the action of air pressure, thus, a movement space can be provided for the first valve core 31 and the second valve core 32.

[0037] Furthermore, the cross section of the first valve core 31 is in a transversely arranged T-shape, the first valve core 31 includes a cylindrical valve head and a cylindrical valve body, the valve head is arranged on the left side of the valve body, the valve head and the valve body are fixedly connected and coaxial, and the diameter of the valve head is greater than the diameter of the valve body; the cross section of the first air cavity 310 is in a transversely arranged T-shape, the first air cavity 310 includes a cylindrical cavity head and a cylindrical cavity body, the cavity head is arranged on the left side of the cavity body, the cavity head and the cavity body are connected and coaxial, and the diameter of the cavity head is greater than the diameter of the cavity body; the length of the cavity head is greater than the length of the valve head, and the length of the cavity body is less than the length of the valve body; the second valve core 32 has the same structure as the first valve core 31, and the second air cavity 320 has the same structure as the first air cavity 310. In this way, when the first valve core 31 and the second valve core 32 move to the right, the stroke of the rightward movement can be limited by the cavity body, and the movement is reliable.

[0038] Furthermore, it also includes a second sealing ring B and a third sealing ring C, which are respectively arranged on the valve head and the valve body, and are coaxial with the first valve core 31 or the second valve core 32. The second sealing ring B and the third sealing ring C form a double-layer dynamic seal, and the seal is reliable.

[0039] See also Figure 3 , which is the second embodiment of the present invention, and is different from the above embodiment in that:

[0040] There are a number of auxiliary valve components, which are arranged in an array along the vertical axis of the main valve component; there are a number of first air outlets 110 and second air outlets 120, which are arranged in an array along the vertical axis of the main valve component.

[0041] Further, the number of the auxiliary valve components is two, and the two auxiliary valve components are symmetrically arranged along the vertical axis of the main valve component.

[0042] In this way, there are more gas circuits, which can adapt to more complex bottle blowing production lines.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas switching device, characterized in that: It includes a main valve component and a secondary valve component which are sequentially arranged from right to left and statically sealed; The main valve component comprises a main valve body (10), the upper end and the lower end of the main valve body (10) are respectively provided with a high-pressure gas port (11) and a recovery gas port (12), and the left side surface of the main valve component is also provided with a first gas outlet (110) and a second gas outlet (120) which are respectively connected to the high-pressure gas port (11) and the recovery gas port (12); The auxiliary valve component comprises an auxiliary valve body (30), wherein the upper part and the lower part of the auxiliary valve body (30) are respectively provided with a first air cavity (310) and a second air cavity (320), wherein the first air cavity (310) and the second air cavity (320) are respectively provided with a first valve core (31) and a second valve core (32), and the first air cavity (310) and the second air cavity (320) are respectively dynamically sealed with the first valve core (31) and the second valve core (32) in the left-right direction; A channel (61) is provided between the main valve body (10) and the auxiliary valve body (30); the upper portion of the channel (61) is in communication with the first air outlet (110) and the first air cavity (310); the lower portion of the channel (61) is in communication with the second air outlet (120) and the second air cavity (320); the right ends of the first valve core (31) and the second valve core (32) pass through the channel (61) and are respectively dynamically sealed with the first air outlet (110) and the second air outlet (120) in the left-right direction; It also includes a main gas outlet (51), which transversely penetrates the auxiliary valve body (30) and communicates with the channel (61); It also includes a cover plate (2), which is arranged on the left side of the auxiliary valve component and is statically sealed with the auxiliary valve component. The upper part and the lower part of the cover plate (2) are respectively provided with a first pilot air port (21) and a second pilot air port (22), and the first pilot air port (21) and the second pilot air port (22) are respectively connected to the first air cavity (310) and the second air cavity (320); the left end of the total air outlet (51) passes through the cover plate (2); the projection of the first air cavity (310) along the left-right direction completely covers the first pilot air port (21), and the projection of the second air cavity (320) along the left-right direction completely covers the second pilot air port (22); The length of the first valve core (31) in the left-right direction and the length of the second valve core (32) in the left-right direction are both smaller than the length of the auxiliary valve body (30) in the left-right direction; The cross section of the first valve core (31) is in the shape of a T arranged transversely. The first valve core (31) comprises a cylindrical valve head and a cylindrical valve body. The valve head is arranged on the left side of the valve body. The valve head and the valve body are fixedly connected and coaxial. The diameter of the valve head is greater than the diameter of the valve body. The cross section of the first air cavity (310) is in the shape of a T arranged transversely. The first air cavity (310) comprises a cylindrical cavity head and a cylindrical cavity body. The cavity head is arranged on the left side of the cavity body. The cavity head and the cavity body are connected and coaxial. The diameter of the cavity head is greater than the diameter of the cavity body. The length of the cavity head is greater than the length of the valve head, and the length of the cavity body is less than the length of the valve body. The second valve core (32) has the same structure as the first valve core (31), and the second air cavity (320) has the same structure as the first air cavity (310). The invention also includes a first sealing ring (A), which is arranged between the main valve body (10) and the auxiliary valve body (30), and the first sealing ring (A) is arranged outside the first air outlet (110) and the second air outlet (120); and also includes a fourth sealing ring (D), which is arranged between the auxiliary valve body (30) and the cover plate (2), and the fourth sealing ring (D) is arranged outside the second air cavity (320), the first air cavity (310), and the main air outlet (51).

2. A gas switching device according to claim 1, characterized in that: It also includes a second sealing ring (B) and a third sealing ring (C). The second sealing ring (B) and the third sealing ring (C) are respectively arranged on the valve head and the valve body. The second sealing ring (B) and the third sealing ring (C) are coaxial with the first valve core (31) or the second valve core (32).

3. A gas switching device according to claim 1, characterized in that: There are a number of auxiliary valve components, and the auxiliary valve components are arranged in an array along the vertical axis of the main valve component; there are a number of first air outlets (110) and second air outlets (120), and the first air outlets (110) and second air outlets (120) are arranged in an array along the vertical axis of the main valve component.

4. A gas switching device according to claim 3, characterized in that: The number of auxiliary valve components is 2, and the two auxiliary valve components are symmetrically arranged along the vertical axis of the main valve component.

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