A pneumatic integrated valve for adjusting the lifting and speed of a cylinder

Abstract

The present invention relates to the technical field of cylinder control, and proposes a pneumatic integrated valve for adjusting the acceleration and deceleration of a cylinder. A first intake air path formed by sequentially connecting a first air source port, an intake air flow path, a connection flow path and a connection port is provided on the valve body, and a throttling component is installed in the first cavity; the connection port, the connection flow path, the exhaust flow path and the exhaust port are sequentially connected to form an exhaust air path. The cylinder pressure is fed back through a feedback port, and the throttling component is pushed by the feedback pressure to control the gas flow area of the first intake air path and the exhaust air path, so as to automatically adjust the air pressure for the inflation and exhaust of the cylinder load, making the acceleration and deceleration of the cylinder more stable, and avoiding the phenomenon that the cylinder has too large a difference in lifting speed due to a large difference in load. By providing a second intake air path, it can be switched with the first intake air path to supply air continuously through the second intake air path.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinder control, and particularly relates to a pneumatic integrated valve for adjusting the lifting and lowering speed of a cylinder. Background Art

[0002] Among the current pneumatic lifting devices on the market, devices with a cylinder structure as the lifting main body include pneumatic hoists, pneumatic balance cranes, pneumatic assist arms, etc. After they are installed and before use, the lifting speed needs to be adjusted.

[0003] During the process of adjusting the lifting speed, if the appropriate lifting speed is adjusted based on the no-load state, after hanging the workpiece, the rising speed will be too slow and the falling speed will be too fast; if the appropriate lifting speed is adjusted based on the load state, after removing the workpiece, the rising speed will be too fast and the falling speed will be too slow. Especially when the workpiece is heavy, the phenomenon of inconsistent lifting speed is very obvious. In actual operation, it is impossible to adjust a suitable lifting speed, and special care needs to be taken in operation, with a relatively high safety risk. In the prior art, there is a "cylinder speed control device" with the publication number CN108691848A, which can switch the telescopic speed of the cylinder to adjust the speed, but it cannot automatically adjust according to the cylinder load. Summary of the Invention

[0004] In view of this, the present invention provides a pneumatic integrated valve for adjusting the lifting and lowering speed of a cylinder, which can automatically adjust the intake and exhaust speeds according to the air pressure inside the cylinder after the cylinder is loaded, so as to balance the lifting and lowering speeds of the cylinder.

[0005] The technical solution of the present invention is realized as follows: The present invention provides a pneumatic integrated valve for adjusting the lifting and lowering speed of a cylinder, including a valve body and a throttling component. Among them,

[0006] A first air source port, an exhaust port, a connection port, a first cavity, an intake air flow channel, an exhaust air flow channel, a connection flow channel and a feedback port are provided on the valve body. The connection port is used to connect the cylinder to supply air intake or exhaust to the cylinder. Among them,

[0007] The first air source port, the intake air flow channel, the connection flow channel and the connection port are sequentially connected to form a first intake air path;

[0008] The connection port, the connection flow channel, the exhaust air flow channel and the exhaust port are sequentially connected to form an exhaust air path;

[0009] The first intake air path and the exhaust air path can be selectively opened or closed simultaneously;

[0010] The throttling component is arranged in the first cavity. The first cavity is connected to the intake air flow channel, the exhaust air flow channel and the feedback port. The feedback port is used to connect the cylinder so that the pressure signal in the cylinder can be fed back into the first cavity;

[0011] When the air pressure in the cylinder increases, the throttle component controls the gas flowable area of the exhaust flow channel to decrease and the gas flowable area of the intake flow channel to increase.

[0012] Based on the above technical solution, preferably, a reserved port is provided on the valve body, and the reserved port is communicated with the connecting flow channel and the connecting port.

[0013] Based on the above technical solution, preferably, it further includes a rising valve core. A second cavity communicating the intake flow channel and the connecting flow channel is provided on the valve body. The rising valve core is located in the second cavity and is used to open or close the communication state of the first intake air path.

[0014] Based on the above technical solution, preferably, it further includes a descending valve core. A third cavity communicating the exhaust flow channel and the connecting flow channel is provided on the valve body. The descending valve core is located in the third cavity and is used to open or close the communication state of the exhaust air path.

[0015] Based on the above technical solution, preferably, a second air source port is provided on the valve body, and the second air source port is communicated with the connecting port to form a second intake air path;

[0016] When the first intake air path and the exhaust air path are both closed, the second intake air path is selectively opened.

[0017] Further preferably, it further includes a switching valve core. A fourth cavity is provided on the valve body. The fourth cavity, the second air source port and the connecting port are connected and communicated. The switching valve core is located in the fourth cavity, and the switching valve core is used to control the opening or closing of the second intake air path.

[0018] Based on the above technical solution, preferably, the valve body includes a base body, an upper cover and a lower cover, wherein,

[0019] The upper cover is fixed on the base body;

[0020] The lower cover is fixed on the side of the base body away from the upper cover.

[0021] Based on the above technical solution, preferably, the throttle component includes two throttle valve cores, and the two throttle valve cores are respectively used to control the gas flowable areas of the exhaust flow channel and the intake flow channel.

[0022] Based on the above technical solution, preferably, it further includes a return spring. The return spring is fixed in the first cavity and is connected to the throttle component, and is used to push the throttle component to reset.

[0023] Based on the above technical solution, preferably, a plurality of mounting holes are provided on the valve body.

[0024] The pneumatic integrated valve for adjusting the lifting and lowering speed of the cylinder of the present invention has the following beneficial effects compared with the prior art:

[0025] (1) By providing a first air source port, an exhaust port, a connection port, a first cavity, an air inlet flow channel, an exhaust flow channel, a connection flow channel and a feedback port on the valve body, and installing a throttling component in the first cavity, a first air intake path is formed by sequentially connecting the first air source port, the air inlet flow channel, the connection flow channel and the connection port; the connection port, the connection flow channel, the exhaust flow channel and the exhaust port are sequentially connected to form an exhaust air path. The cylinder pressure is fed back through the feedback port, and the throttling component is pushed by the feedback pressure to control the gas flow area of the first air intake path and the exhaust air path, so as to automatically adjust the air pressure for the inflation and exhaust of the cylinder load, making the lifting and lowering speed of the cylinder more stable and avoiding the phenomenon that the lifting and lowering speeds of the cylinder are too different due to large load differences.

[0026] (2) By providing a second air source port, a fourth cavity and a switching spool, a second air intake path is formed between the second air source port and the exhaust port, and the opening and closing action of the second air intake path is controlled by the switching spool. When the air supply pressure range of the first air intake path cannot meet the requirements of the working conditions, the second air intake path can be opened to directly supply air through the second air source port connected to other compressed air sources. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is a perspective view of the pneumatic integrated valve for adjusting the lifting and lowering speed of the cylinder of the present invention;

[0029] Figure 2 is another perspective view of the pneumatic integrated valve for adjusting the lifting and lowering speed of the cylinder of the present invention;

[0030] Figure 3 is a side view of the pneumatic integrated valve for adjusting the lifting and lowering speed of the cylinder of the present invention;

[0031] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0032] Figure 5 is a front view of the pneumatic integrated valve for adjusting the lifting and lowering speed of the cylinder of the present invention;

[0033] Figure 6 is Figure 5 a cross-sectional view taken along line B-B in

[0034] Figure 7 Schematic diagrams of the valve cores of the pneumatic integrated valve for adjusting the lifting speed of the cylinder according to the present invention;

[0035] Figure 8 Pneumatic circuit control diagram of the pneumatic integrated valve for adjusting the lifting speed of the cylinder according to the present invention. Specific embodiments

[0036] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] As Figure 1-8 shown, the pneumatic integrated valve for adjusting the lifting speed of the cylinder according to the present invention includes a valve body 1 and a throttling assembly 2.

[0038] The valve body 1 is made of aluminum alloy as a whole, which has good strength, corrosion resistance and machining performance. Four mounting holes 114 are provided on the valve body 1. The valve body 1 can be fixed to the equipment or bracket by using screws to pass through the mounting holes 114. A first air source port 101, an exhaust port 102, a connection port 103 and a feedback port 108 are arranged outside the valve body 1, and a first cavity 104, an air inlet flow channel 105, an exhaust flow channel 106 and a connection flow channel 107 are arranged inside. The connection port 103 is used to connect the air holes of the cylinder to supply air to or exhaust air from the cylinder. The first air source port 101 is used to connect the compressed air source to supply the compressed air source to enter. The exhaust port 102 is used to discharge the compressed gas in the cylinder. The first air source port 101, the air inlet flow channel 105, the connection flow channel 107 and the connection port 103 are sequentially connected to form a first air intake circuit. The compressed air source enters the cylinder through the first air intake circuit to control the cylinder to act. The connection port 103, the connection flow channel 107, the exhaust flow channel 106 and the exhaust port 102 are sequentially connected to form an exhaust air circuit. The compressed gas in the cylinder is discharged outward through the exhaust air circuit. Specifically, the cylinder has a front air hole and a rear air hole. The connection port 103 can be connected to one of the front air hole or the rear air hole. In the specific use process, one of the first air intake circuit and the exhaust air circuit can be selectively opened or both closed at the same time. When the first air intake circuit is opened, the compressed air source fills the cylinder with air from the first air source port 101. When the exhaust air circuit is opened, the compressed gas in the cylinder is discharged outward through the exhaust port 102. When both the first air intake circuit and the exhaust air circuit are closed, the external gas cannot enter the corresponding air holes of the cylinder, and the gas in the cylinder cannot be discharged through the corresponding air holes.

[0039] The throttle component 2 is arranged in the first cavity 104. The first cavity 104 is communicated with the intake air flow channel 105, the exhaust air flow channel 106 and the feedback port 108. The feedback port 108 is used to connect the inner cavity of the cylinder. By communicating the inner cavity of the cylinder with the first cavity 104, the pressure signal in the cylinder can be fed back to the upper part of the first cavity 104, so that the throttle component 2 is driven to act by air pressure. When the air pressure in the cylinder increases, the throttle component 2 controls the reduction of the available flow area of the gas in the exhaust air flow channel 106, that is, when there is a load in the cylinder resulting in excessive internal pressure, during the process of the cylinder exhausting air, the available flow area of the gas in the exhaust air flow channel 106 decreases, which can reduce the discharging speed of the gas in the cylinder, thus avoiding the phenomenon that the descending speed of the gas in the cylinder changes greatly due to the load change; when the air pressure in the cylinder increases, the throttle component 2 controls the increase of the available flow area of the gas in the intake air flow channel 105, that is, when there is a load in the cylinder resulting in the rise of the internal pressure, during the process of inflating the cylinder, the available flow area of the gas in the intake air flow channel 105 increases, so that the entering speed of the compressed air source is accelerated, thus avoiding the phenomenon that the rising speed of the cylinder changes greatly due to the load change.

[0040] As a preferred embodiment, a reserved port 109 is arranged on the valve body 1. The reserved port 109 is communicated with the connecting flow channel 107 and the connecting port 103. The reserved port 109 can be blocked by a sealing plug to make it in a normally closed state. After the reserved port 109 is opened, the cylinder can be directly inflated and exhausted through the reserved port 109.

[0041] As a preferred embodiment, it further includes a rising valve core 3. A second cavity 110 communicating with the intake air flow channel 105 and the connecting flow channel 107 is provided on the valve body 1. The rising valve core 3 is located in the second cavity 110 and is used to open or close the communication state of the first intake air path. Specifically, the second cavity 110 is also communicated with the exhaust flow channel 106, but the movement of the rising valve core 3 does not affect the communication state of the exhaust flow channel 106. There are four sealing rings outside the rising valve core 3 for separating the second cavity 110. When the rising valve core 3 closes the first intake air path, the upper two sealing rings are used to separate the second cavity 110 from the exhaust flow channel 106 to ensure the communication of the exhaust flow channel 106. The middle two sealing rings are used to separate the connecting flow channel 107 from the intake air flow channel 105. When the rising valve core 3 moves upward to open the first intake air path, the middle two sealing rings move to the initial positions of the upper two sealing rings, and the connecting flow channel 107 and the intake air flow channel 105 are communicated through the lower two sealing rings. To enable the rising valve core 3 to move vertically and change the control state, a vent hole is provided at the top of the valve body 1. When the rising valve core 3 moves, the gas inside the second cavity 110 can be discharged outward, or external gas can enter the second cavity 110. At the same time, a rising air control port is provided at the bottom of the valve body 1. Gas is filled into the second cavity 110 through the rising air control port to make the rising valve core 3 move and change the control state of the first intake air path, realizing the pneumatic control of the rising valve core 3. At the same time, a spring is installed in the second cavity 110 to assist the rising valve core 3 to reset, thereby realizing the opening and closing control of the first intake air path.

[0042] As a preferred embodiment, it further includes a descending valve core 4. A third cavity 111 communicating with the exhaust flow channel 106 and the connecting flow channel 107 is provided on the valve body 1. The descending valve core 4 is located in the third cavity 111 and is used to open or close the communication state of the exhaust air path. Three sealing rings are provided on the descending valve core 4 for separating the third cavity 111. When the exhaust air path is closed, the upper two sealing rings are used to separate the third cavity 111, the exhaust flow channel 106 and the connecting flow channel 107. After the descending valve core 4 moves upward, the connecting flow channel 107 and the exhaust flow channel 106 are communicated through the lower two sealing rings, thereby opening the exhaust air path. The control method of the descending valve core 4 is the same as that of the rising valve core 3. By providing a vent hole and a descending air control port communicating with the third cavity 111 on the valve body 1, and installing a spring for resetting the descending valve core 4 inside the third cavity 111, control gas is introduced through the descending air control port, and the descending valve core 4 is controlled to switch actions by filling gas, completing the opening and closing control of the exhaust air path.

[0043] As a preferred embodiment, a second air source port 113 is provided on the valve body 1. The second air source port 113 communicates with the connection port 103 to form a second intake air path. When the pressure adjustment range of the first air source port 101 cannot meet the operating conditions of the cylinder, after closing the first intake air path and the exhaust air path simultaneously, the second intake air path can be opened. Connect a gas supply device through the second air source port 113, and supply air to the cylinder through the second intake air path. To stop the air supply, only need to disconnect the second intake air path.

[0044] Specifically, it further includes a switching spool 5. A fourth cavity 112 is provided on the valve body 1. The fourth cavity 112, the second air source port 113 and the connection port 103 are connected and communicated. The switching spool 5 is located in the fourth cavity 112. The switching spool 5 is used to control the opening or closing of the second intake air path. Three sealing rings are arranged outside the switching spool 5 for separating the fourth cavity 112. When the second intake air path is closed, the upper two sealing rings are used to separate the second air source port 113 and the connection port 103. The switching spool 5 moves upward to open the second intake air path, and the lower two sealing rings connect the second air source port 113 and the connection port 103. Further, for the control of the switching spool 5, an upper air control port and a lower air control port communicating with the fourth cavity 112 can be respectively opened on the upper and lower sides of the valve body 1. Control gas can be introduced into both the upper air control port and the lower air control port to perform two-way control of the switching spool 5.

[0045] It should be noted that for the rising spool 3, the falling spool 4 and the switching spool 5, an air control button can be directly used for pneumatic control, and the opening and closing action of the air path can be completed by manually pressing the button.

[0046] As a preferred embodiment, the valve body 1 includes a base body 11, an upper cover 12 and a lower cover 13. The upper cover 12 is fixed on the base body 11, and the lower cover 13 is fixed on the side of the base body 11 away from the upper cover 12. Both the upper cover 12 and the lower cover 13 are fixed on the base body 11 by screws. The provided upper cover 12 and lower cover 13 can facilitate the installation of each spool onto the base body 11.

[0047] In order to throttle and control the exhaust passage 106 and the intake passage 105, the throttling assembly 2 includes two throttle valve cores 21. The two throttle valve cores 21 are respectively used to control the gas flowable area of the exhaust passage 106 and the intake passage 105. Specifically, sealing rings and plugging members are arranged on the throttle valve cores 21. The exhaust passage 106 and the intake passage 105 are throttled through the plugging members. When the pressure in the cylinder does not increase, the exhaust passage 106 is in a fully open state, and the intake passage 105 is in a minimum flow state. When the two throttle valve cores 21 respectively control the flow rates of the exhaust passage 106 and the intake passage 105, under any working conditions, they cannot completely block the exhaust passage 106 and the intake passage 105, so as to obtain two states of the minimum intake flow rate and the minimum exhaust flow rate.

[0048] In order to enable the throttling assembly 2 to be reset, a return spring 6 is further included. The return spring 6 is fixed in the first cavity 104 and is connected to the throttling assembly 2, and is used to push the throttling assembly 2 to reset. That is, when the air pressure in the cylinder decreases from large to small, the return spring 6 will push the throttling assembly 2 to move upward until the initial position, and the pressure of the air pressure in the cylinder pushing the throttling assembly 2 is equal to the pressure received by the return spring 6. That is to say, the air pressure in the cylinder is proportional to the deformation distance of the return spring 6. It should be noted that the maximum deformation distance of the return spring 6 is the distance between the position of the throttling assembly 2 at the maximum flow rate of the exhaust passage 106 and the position of the throttling assembly 2 at the minimum flow rate of the exhaust passage 106.

[0049] Working principle: The connection port 103 is connected to the cylinder, and compressed gas is sent through the first air supply port 101. When the first intake air path is opened, the compressed gas is sent into the cylinder for the cylinder to act. When the cylinder is loaded for operation, the air pressure in the cylinder increases, and the air pressure is fed back to the first cavity 104 through the feedback port 108. The throttling assembly 2 is pushed to move by the feedback air pressure. The gas flowable area of the intake passage 105 is proportional to the feedback air pressure, so as to compensate the inflation pressure after the cylinder is loaded. Similarly, when the first intake air path is closed and the exhaust air path is opened, the compressed gas in the cylinder and the air pressure in the cylinder decrease, and the air pressure is fed back to the first cavity 104 through the feedback port 108. The throttling assembly 2 moves according to the magnitude of the feedback air pressure, and the gas flowable area is inversely proportional to the feedback air pressure, so that the compressed gas in the cylinder is discharged almost uniformly, avoiding the too fast discharge rate of the gas when the internal pressure of the cylinder is relatively high, and making the difference in the lifting speeds of the cylinder when it is unloaded and loaded as small as possible.

[0050] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pneumatic integrated valve for adjusting the lifting and speed of a cylinder, characterized in that: It includes a valve body (1), a throttling component (2) and a switching spool (5). Among them, The valve body (1) is provided with a first air source port (101), an exhaust port (102), a connection port (103), a first cavity (104), an air inlet passage (105), an exhaust passage (106), a connection passage (107) and a feedback port (108). The connection port (103) is used to connect a cylinder to supply air intake or exhaust to the cylinder. Among them, The first air source port (101), the air inlet passage (105), the connection passage (107) and the connection port (103) are sequentially connected to form a first air intake path; The connection port (103), the connection passage (107), the exhaust passage (106) and the exhaust port (102) are sequentially connected to form an exhaust path; The first air intake path and the exhaust path can be selectively opened or closed simultaneously; The valve body (1) is provided with a second air source port (113). The second air source port (113) and the connection port (103) are connected to form a second air intake path; When the first air intake path and the exhaust path are closed simultaneously, the second air intake path is selectively opened; The valve body (1) is provided with a fourth cavity (112). The fourth cavity (112), the second air source port (113) and the connection port (103) are connected. The switching spool (5) is located in the fourth cavity (112). The switching spool (5) is used to control the opening or closing of the second air intake path; The throttling component (2) is arranged in the first cavity (104). The first cavity (104) is connected to the air inlet passage (105), the exhaust passage (106) and the feedback port (108). The feedback port (108) is used to connect a cylinder so that the pressure signal in the cylinder can be fed back into the first cavity (104); The throttling component (2) includes two throttling spools (21). The two throttling spools (21) are respectively used to control the gas flowable area of the exhaust passage (106) and the air inlet passage (105); When the air pressure in the cylinder increases, the throttling component (2) controls the gas flowable area of the exhaust passage (106) to decrease and the gas flowable area of the air inlet passage (105) to increase.

2. The pneumatic integrated valve for adjusting the lifting speed of the cylinder according to claim 1, wherein: The valve body (1) is provided with a reserved port (109). The reserved port (109) is connected to the connection passage (107) and the connection port (103).

3. The pneumatic integrated valve for adjusting the lifting speed of the cylinder according to claim 1, characterized in that: It further includes a rising spool (3). The valve body (1) is provided with a second cavity (110) connecting the air inlet passage (105) and the connection passage (107). The rising spool (3) is located in the second cavity (110) and is used to open or close the connection state of the first air intake path.

4. The pneumatic integrated valve for adjusting the cylinder lifting speed as claimed in claim 1, wherein: It further includes a descending spool (4). The valve body (1) is provided with a third cavity (111) connecting the exhaust passage (106) and the connection passage (107). The descending spool (4) is located in the third cavity (111) and is used to open or close the connection state of the exhaust path.

5. The pneumatic integrated valve for adjusting the cylinder lifting and lowering speed according to claim 1, characterized in that: The valve body (1) includes a base body (11), an upper cover (12) and a lower cover (13). Among them, The upper cover (12) is fixed on the base body (11); The lower cover (13) is fixed to the side of the base body (11) away from the upper cover (12).

6. The pneumatic integrated valve for adjusting the cylinder lifting speed as claimed in claim 1, wherein: It further includes a return spring (6). The return spring (6) is fixed in the first cavity (104) and is connected to the throttle component (2) for pushing the throttle component (2) to reset.

7. The pneumatic integrated valve for adjusting the lifting speed of the cylinder according to claim 1, wherein: A plurality of mounting holes (114) are formed in the valve body (1).

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