Flow shut-off device for a pneumatic directional control valve

Abstract

The utility model relates to the technical field of reversing valve, especially a flow interception device of pneumatic control reversing valve, it includes control mechanism, the control mechanism includes first connecting sleeve and second connecting sleeve, the first connecting sleeve is installed on the inner end face of first slide valve, the second connecting sleeve is installed on the inner end face of second slide valve, the inner side wall of first connecting sleeve is set up with first communication groove and second communication groove, the caliber of first communication groove and second communication groove is different, the inner side wall of second connecting sleeve is set up with third communication groove and fourth communication groove, the caliber of third communication groove and fourth communication groove is different. The present application has realized four gear's reversing valve's adjustment, realized the effect that the output does not need hydraulic pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of directional valves, and in particular to a flow control device for a pneumatically controlled directional valve. Background Technology

[0002] Directional control valves are core control components in hydraulic and pneumatic systems. Their basic function is to guide or change the flow path of fluids (hydraulic oil or compressed air) in the system. Pneumatic directional control valves are valves that use compressed air as a control signal to drive hydraulic oil circuits to change direction. They combine the control flexibility of pneumatic transmission with the high power output advantage of hydraulic transmission.

[0003] In existing two-position three-way pneumatic hydraulic directional valves, the oil output of the two outlets is fixed, resulting in only one pressure mode at the output end of the hydraulic device. This can easily lead to energy waste when the weight of the object to be hydraulically propelled is low. Utility Model Content

[0004] In order to achieve different hydraulic power outputs, this application provides a flow control device for a pneumatically controlled directional valve.

[0005] This application provides a flow control device for a pneumatically controlled directional valve, which adopts the following technical solution: A flow control device for a pneumatically controlled directional valve includes a valve body with an oil inlet, a first oil outlet, and a second oil outlet. A first spool valve and a second spool valve are slidably connected within the valve body. The first spool valve and the second spool valve are connected by a connecting rod. A transmission rod is fixedly connected to the first spool valve, and the transmission rod is controlled by an air source. Both the first and second spool valves are equipped with a control mechanism. The control mechanism includes a first connecting sleeve and a second connecting sleeve. The first connecting sleeve is installed on the inner end face of the first spool valve, and the second connecting sleeve is installed on the inner end face of the second spool valve. The inner sidewall of the first connecting sleeve has a first connecting groove and a second connecting groove with different diameters. The inner sidewall of the second connecting sleeve has a third connecting groove and a fourth connecting groove with different diameters.

[0006] By adopting the above technical solution, when the control valve is in use, the air source drives the transmission rod to slide, which in turn drives the first and second spool valves to slide. At this time, the first connecting groove is connected to the first oil outlet, and the second spool valve closes the second oil outlet, realizing the hydraulic drive of the first gear. Then, the transmission rod continues to drive the first and second spool valves to slide, and the second connecting groove is connected to the first oil outlet, while the second spool valve remains closed, realizing the hydraulic drive of the second gear. Then, the transmission rod continues to drive the first and second spool valves to slide, and the third connecting groove is connected to the second oil outlet, while the first spool valve closes the first oil outlet, realizing the hydraulic drive of the third gear. Then, the transmission rod continues to drive the first and second spool valves to slide, and the third connecting groove is connected to the second oil outlet, while the first spool valve closes the first oil outlet, realizing the hydraulic drive of the third gear. Thus, the four gears of the directional valve can be adjusted, achieving output without hydraulic pressure.

[0007] Optionally, a mounting groove 1 is formed on the inner end face of the first slide valve, and a mounting groove 2 is formed on the inner end face of the second slide valve. A first sliding groove is formed on the side wall of the mounting groove 1, and a seventh sliding groove is formed on the side wall of the mounting groove 2. A first annular limiting groove is formed on the side wall of the mounting groove 1, and a second annular limiting groove is formed on the side wall of the mounting groove 2. A fixing mechanism is installed on the first connecting sleeve. The fixing mechanism includes two fixing rings. The two fixing rings are respectively fixedly connected to the first connecting sleeve and the second connecting sleeve. An arc-shaped limiting block is fixedly connected to the ends of the two fixing rings that are far apart from each other. The two fixing rings are respectively inserted into the mounting groove 1 and the mounting groove 2. One of the arc-shaped limiting blocks is slidably connected to the first annular limiting groove through the first sliding groove, and the other arc-shaped limiting block is slidably connected to the second annular limiting groove through the seventh sliding groove.

[0008] By adopting the above technical solution, when installing the first connecting sleeve and the second connecting sleeve, the two fixing rings are manually inserted into the first mounting groove and the second mounting groove respectively. At this time, one arc-shaped limiting block enters the first annular limiting groove through the first sliding groove, and the other arc-shaped limiting block enters the second annular limiting groove through the seventh sliding groove. Then, the fixing rings are rotated so that the two arc-shaped limiting blocks are respectively engaged in the first annular limiting groove and the second annular limiting groove, thereby realizing the installation of the first connecting sleeve and the second connecting sleeve.

[0009] Optionally, the arc-shaped limiting block has a second sliding groove at one end away from the fixing ring, and the fixing mechanism further includes an anti-detachment component, which includes an anti-detachment spring. The anti-detachment spring is fixedly connected to the bottom wall of the second sliding groove, and a second sliding rod is slidably connected in the second sliding groove. The second sliding rod is fixedly connected to the anti-detachment spring.

[0010] By adopting the above technical solution, when the rotating fixed ring causes the arc-shaped limiting block to engage with the annular limiting groove, the second sliding rod is pressed against the side wall of the annular limiting groove under the pressure of the anti-disengagement spring, thereby reducing the probability of the arc-shaped limiting block and the fixed ring loosening and rotating during use; and improving the operational stability of the equipment.

[0011] Optionally, a third sliding groove is provided on the side wall of both the first and second connecting sleeves, and a fourth sliding groove is provided on the bottom wall of the third sliding groove. A first limiting groove, a second limiting groove, a third limiting groove, and a fourth limiting groove are provided on the side wall inside the valve body. A limiting mechanism is installed on both the first and second connecting sleeves. The limiting mechanism includes a limiting ball, which is slidably connected in the third sliding groove. A spring-loaded assembly is installed in the fourth sliding groove, and the spring-loaded assembly is rotatably connected to the limiting ball.

[0012] By adopting the above technical solution, when adjusting different hydraulic gears, the sliding accuracy of the first and second connecting sleeves is affected by the external environment, which may lead to deviation. The setting of the limit ball reduces the impact of the external environment on the sliding accuracy of the first and second connecting sleeves. When the first connecting groove is connected to the first oil outlet, the limit ball is engaged in the first limit groove; when the second connecting groove is connected to the first oil outlet, the limit ball is engaged in the second limit groove; when the third connecting groove is connected to the second oil outlet, the limit ball is engaged in the third limit groove; and when the fourth connecting groove is connected to the second oil outlet, the limit ball is engaged in the fourth limit groove. Thus, the first and second connecting sleeves are limited at different gears, reducing the probability of accidental sliding of the first and second connecting sleeves.

[0013] Optionally, the rebound assembly includes a sliding plate, which is slidably connected in the fourth slide groove and rotatably connected to the limiting ball. A first fixing seat is fixedly connected to the bottom wall of the fourth slide groove. A fifth slide groove is formed on the end face of the first fixing seat near the sliding plate. A limiting spring is fixedly connected to the bottom wall of the fifth slide groove. A first sliding rod is also slidably connected in the fifth slide groove. The two ends of the first sliding rod are fixedly connected to the sliding plate and the limiting spring, respectively.

[0014] By adopting the above technical solution, when the limiting ball is ejected, the limiting spring drives the first sliding rod to slide, the first sliding rod drives the sliding plate to move, and the sliding plate drives the top of the limiting ball to slide out of the first sliding groove, thereby achieving the limiting.

[0015] Optionally, a reset mechanism is also installed on the valve body. The reset mechanism includes a second fixed seat, which is fixedly connected to the valve body. A sixth sliding groove is provided on the end face of the second fixed seat away from the valve body. A reset spring is fixedly connected to the bottom wall of the sixth sliding groove. A sliding sleeve is slidably connected in the sixth sliding groove. The sliding sleeve is fixedly connected to the transmission rod and the reset spring.

[0016] By adopting the above technical solution, the setting of the return spring assists in the reset of the transmission rod, making the reset of the transmission rod more convenient.

[0017] In summary, this application includes the following beneficial technical effects: 1. When the control valve is in use, the air source drives the transmission rod to slide, which in turn drives the first and second spool valves to slide. At this time, the first connecting groove is connected to the first oil outlet, and the second spool valve is closed to the second oil outlet, realizing the hydraulic drive of the first position. Then, the transmission rod continues to drive the first and second spool valves to slide, and the second connecting groove is connected to the first oil outlet, while the second spool valve remains closed to the second oil outlet, realizing the hydraulic drive of the second position. Then, the transmission rod continues to drive the first and second spool valves to slide, and the third connecting groove is connected to the second oil outlet, while the first spool valve is closed to the first oil outlet, realizing the hydraulic drive of the third position. Then, the transmission rod continues to drive the first and second spool valves to slide, and the third connecting groove is connected to the second oil outlet, while the first spool valve is closed to the first oil outlet, realizing the hydraulic drive of the third position. Thus, the four-position reversing valve can be adjusted to achieve output without hydraulic pressure. 2. When installing the first connecting sleeve and the second connecting sleeve, manually insert the two fixing rings into the first mounting groove and the second mounting groove respectively. At this time, one arc-shaped limiting block enters the first annular limiting groove through the first sliding groove, and the other arc-shaped limiting block enters the second annular limiting groove through the seventh sliding groove. Then rotate the fixing rings so that the two arc-shaped limiting blocks are respectively engaged in the first annular limiting groove and the second annular limiting groove, thereby realizing the installation of the first connecting sleeve and the second connecting sleeve. 3. When the rotating fixed ring causes the arc-shaped limiting block to engage with the annular limiting groove, the second sliding rod is pressed against the side wall of the annular limiting groove under the pressure of the anti-disengagement spring, thereby reducing the probability of the arc-shaped limiting block and the fixed ring loosening and rotating during use; and improving the operational stability of the equipment. 4. When adjusting different hydraulic gears, the sliding accuracy of the first and second connecting sleeves is affected by the external environment, leading to deviation. The setting of the limit ball reduces the impact of the external environment on the sliding accuracy of the first and second connecting sleeves. When the first connecting groove is connected to the first oil outlet, the limit ball is engaged in the first limit groove; when the second connecting groove is connected to the first oil outlet, the limit ball is engaged in the second limit groove; when the third connecting groove is connected to the second oil outlet, the limit ball is engaged in the third limit groove; and when the fourth connecting groove is connected to the second oil outlet, the limit ball is engaged in the fourth limit groove. This ensures that the first and second connecting sleeves are limited at different gears, reducing the probability of accidental slippage of the first and second connecting sleeves. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the flow control device of the pneumatic reversing valve in the embodiments of this application; Figure 2 This is a cross-sectional view of the flow control device of the pneumatically controlled directional valve in the embodiments of this application; Figure 3 For this application Figure 2 Enlarged view of section A; Figure 4 For this application Figure 2 Enlarged view of section B; Figure 5 This is a cross-sectional view of the first connecting sleeve in an embodiment of this application; Figure 6 This is a cross-sectional view of the second connecting sleeve in an embodiment of this application; Figure 7 This is a cross-sectional view of the reset mechanism in an embodiment of this application.

[0019] Reference numerals: 1. Valve body; 11. Oil inlet; 111. First limiting groove; 112. Second limiting groove; 113. Third limiting groove; 114. Fourth limiting groove; 12. First oil outlet; 13. Second oil outlet; 2. Transmission rod; 31. First slide valve; 32. Second slide valve; 33. Connecting rod; 4. Control mechanism; 41. First connecting sleeve; 411. Mounting groove one; 412. First sliding groove; 413. First annular limiting groove; 42. Second connecting sleeve; 421. Mounting groove two; 422. Second annular limiting groove; 423. Seventh sliding groove; 43. First connecting groove; 44. Second... 45. Communicating groove; 46. Third communicating groove; 47. Fourth communicating groove; 48. Third sliding groove; 49. Fourth sliding groove; 50. Limiting mechanism; 51. Limiting ball; 52. Rebound assembly; 521. Sliding plate; 522. First sliding rod; 523. First fixed seat; 524. Limiting spring; 525. Fifth sliding groove; 61. Fixing mechanism; 62. Fixing ring; 63. Arc-shaped limiting block; 641. Second sliding groove; 65. Anti-detachment assembly; 661. Second sliding rod; 672. Anti-detachment spring; 78. Reset mechanism; 79. Second fixed seat; 70. Sixth sliding groove; 71. Sliding sleeve; 72. Reset spring. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0021] This application discloses a flow control device for a pneumatically controlled directional valve.

[0022] refer to Figure 1 and Figure 2 The flow control device of the pneumatically controlled directional valve includes a valve body 1. The valve body 1 has an oil inlet 11, a first oil outlet 12, and a second oil outlet 13. A first slide valve 31 and a second slide valve 32 are slidably connected inside the valve body 1. The first slide valve 31 and the second slide valve 32 are connected by a connecting rod 33. A transmission rod 2 is fixedly connected to the first slide valve 31. The transmission rod 2 is controlled by a pneumatic source. A control mechanism 4 is installed on both the first slide valve 31 and the second slide valve 32. The control mechanism 4 includes a first connecting sleeve 41 and a second connecting sleeve 42. Two connecting sleeves 42 are provided. The first connecting sleeve 41 is installed on the inner end face of the first slide valve 31, and the second connecting sleeve 42 is installed on the inner end face of the second slide valve (32). The inner side wall of the first connecting sleeve 41 is provided with a first connecting groove 43 and a second connecting groove 44, the diameters of the first connecting groove 43 and the second connecting groove 44 are different. The inner side wall of the second connecting sleeve 42 is provided with a third connecting groove 45 and a fourth connecting groove 46, the diameters of the third connecting groove 45 and the fourth connecting groove 46 are different.

[0023] When the control valve is in use, the air source drives the transmission rod 2 to slide, which in turn drives the first slide valve 31 and the second slide valve 32 to slide. At this time, the first connecting groove 43 is connected to the first oil outlet 12, and the second slide valve 32 closes the second oil outlet 13, realizing the hydraulic drive of the first gear. Then, the transmission rod 2 continues to drive the first slide valve 31 and the second slide valve 32 to slide. At this time, the second connecting groove 44 is connected to the first oil outlet 12, and the second slide valve 32 remains closed to the second oil outlet 13, realizing the hydraulic drive of the second gear. Then the transmission... Rod 2 continues to drive the first slide valve 31 and the second slide valve 32 to slide. At this time, the third connecting groove 45 is connected to the second oil outlet 13, and the first slide valve 31 closes the first oil outlet 12, realizing the hydraulic drive of the third gear. Then, the transmission rod 2 continues to drive the first slide valve 31 and the second slide valve 32 to slide. At this time, the third connecting groove 45 is connected to the second oil outlet 13, and the first slide valve 31 closes the first oil outlet 12, realizing the hydraulic drive of the third gear. Thus, the adjustment of the four gear reversing valves is realized, realizing the output without hydraulic pressure.

[0024] refer to Figure 3 and Figure 4 The first connecting sleeve 41 and the second connecting sleeve 42 are provided with a third sliding groove 47 on their side walls, and a fourth sliding groove 48 is provided on the bottom wall of the third sliding groove 47. The valve body 1 is provided with a first limiting groove 111, a second limiting groove 112, a third limiting groove 113 and a fourth limiting groove 114 on its inner side wall. The first connecting sleeve 41 and the second connecting sleeve 42 are both equipped with a limiting mechanism 5. The limiting mechanism 5 includes a limiting ball 51, which is slidably connected in the third sliding groove 47. A spring-loaded assembly 52 is installed in the fourth sliding groove 48, and the spring-loaded assembly 52 is rotatably connected to the limiting ball 51.

[0025] The rebound assembly 52 includes a sliding plate 521, which is slidably connected in a fourth slide groove 48 and rotatably connected to a limiting ball 51. A first fixing seat 523 is fixedly connected to the bottom wall of the fourth slide groove 48. A fifth slide groove 525 is formed on the end face of the first fixing seat 523 near the sliding plate 521. A limiting spring 524 is fixedly connected to the bottom wall of the fifth slide groove 525. A first sliding rod 522 is also slidably connected in the fifth slide groove 525. The two ends of the first sliding rod 522 are fixedly connected to the sliding plate 521 and the limiting spring 524, respectively.

[0026] When adjusting different hydraulic levels, the sliding accuracy of the first connecting sleeve 41 and the second connecting sleeve 42 is affected by the external environment, leading to deviation. The setting of the limiting ball 51 reduces the impact of the external environment on the sliding accuracy of the first connecting sleeve 41 and the second connecting sleeve 42. When the first connecting groove 43 is connected to the first oil outlet 12, the limiting spring 524 drives the first sliding rod 522 to slide, the first sliding rod 522 drives the sliding plate 521 to move, and the sliding plate 521 drives the top of the limiting ball 51 to slide out of the first sliding groove 412. The limiting ball 51 is engaged in the first limiting groove 111; when the second connecting groove 44 is connected to the first oil outlet 12, the limiting ball 51 is engaged in the second limiting groove 112; when the third connecting groove 45 is connected to the second oil outlet 13, the limiting ball 51 is engaged in the third limiting groove 113; when the fourth connecting groove 46 is connected to the second oil outlet 13, the limiting ball 51 is engaged in the fourth limiting groove 114. This ensures that the first connecting sleeve 41 and the second connecting sleeve 42 are both limited at different gear positions, reducing the probability of accidental slippage of the first connecting sleeve 41 and the second connecting sleeve 42.

[0027] refer to Figure 4 , Figure 5 and Figure 6 The first slide valve 31 has a mounting groove 411 on its inner end face, and the second slide valve 32 has a mounting groove 421 on its inner end face. Each mounting groove 411 has a first sliding groove 412 on its side wall, and each mounting groove 421 has a seventh sliding groove 423 on its side wall. Each mounting groove 411 has a first annular limiting groove 413 on its side wall, and each mounting groove 421 has a second annular limiting groove 422 on its side wall. A fixing mechanism 6 is installed on the first connecting sleeve 41. The fixing mechanism 6 includes two fixing rings 61. The fixing rings 61 are fixedly connected to the first connecting sleeve 41 and the second connecting sleeve 42 respectively. Each of the two fixing rings 61 has an arc-shaped limiting block 62 fixedly connected to one end of each other. The two fixing rings 61 are respectively inserted into the first mounting groove 411 and the second mounting groove 421. One of the arc-shaped limiting blocks 62 is slidably connected to the first annular limiting groove 413 through the first sliding groove 412, and the other arc-shaped limiting block 62 is slidably connected to the second annular limiting groove 422 through the seventh sliding groove 423.

[0028] The arc-shaped limiting block 62 has a second sliding groove 621 at one end away from the fixing ring 61. The fixing mechanism 6 also includes an anti-detachment component 63, which includes an anti-detachment spring 632. The anti-detachment spring 632 is fixedly connected to the bottom wall of the second sliding groove 621. A second sliding rod 631 is slidably connected in the second sliding groove 621. The second sliding rod 631 is fixedly connected to the anti-detachment spring 632.

[0029] When installing the first connecting sleeve 41 and the second connecting sleeve 42, manually insert the two fixing rings 61 into the first mounting groove 411 and the second mounting groove 421 respectively. At this time, one arc-shaped limiting block 62 enters the first annular limiting groove 413 through the first sliding groove 412, and the other arc-shaped limiting block 62 enters the second annular limiting groove 422 through the seventh sliding groove 423. Then rotate the fixing ring 61 so that the two arc-shaped limiting blocks 62 are respectively engaged in the first annular limiting groove 413 and the second annular limiting groove 422, thereby realizing the installation of the first connecting sleeve 41 and the second connecting sleeve 42. Furthermore, the second sliding rod 631 is pressed against the side wall of the annular limiting groove 413 under the pressure of the anti-detachment spring 632, thereby reducing the probability of the arc-shaped limiting block 62 and the fixing ring 61 loosening and rotating during use, and improving the operational stability of the equipment.

[0030] refer to Figure 7 The valve body 1 is also equipped with a reset mechanism 7, which includes a second fixed seat 71. The second fixed seat 71 is fixedly connected to the valve body 1. A sixth sliding groove 711 is provided on the end face of the second fixed seat 71 away from the valve body 1. A reset spring 73 is fixedly connected to the bottom wall of the sixth sliding groove 711. A sliding sleeve 72 is slidably connected in the sixth sliding groove 711. The sliding sleeve 72 is fixedly connected to the transmission rod 2 and to the reset spring 73. The reset spring 73 assists in the reset of the transmission rod 2, making the reset of the transmission rod 2 more convenient.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flow control device for a pneumatically controlled directional valve, characterized in that, The system includes a valve body (1), which has an oil inlet (11), a first oil outlet (12), and a second oil outlet (13). A first slide valve (31) and a second slide valve (32) are slidably connected inside the valve body (1). The first slide valve (31) and the second slide valve (32) are connected by a connecting rod (33). A transmission rod (2) is fixedly connected to the first slide valve (31). The transmission rod (2) is controlled by an air source. A control mechanism (4) is installed on both the first slide valve (31) and the second slide valve (32). The control mechanism (4) includes a first connecting sleeve (41) and a second connecting sleeve (42). The first connecting sleeve (41) is installed on the inner end face of the first slide valve (31), and the second connecting sleeve (42) is installed on the inner end face of the second slide valve (32). The inner side wall of the first connecting sleeve (41) is provided with a first connecting groove (43) and a second connecting groove (44), the diameters of the first connecting groove (43) and the second connecting groove (44) are different. The inner side wall of the second connecting sleeve (42) is provided with a third connecting groove (45) and a fourth connecting groove (46), the diameters of the third connecting groove (45) and the fourth connecting groove (46) are different.

2. The flow control device for the pneumatically controlled directional valve according to claim 1, characterized in that, The first slide valve (31) has an installation groove 1 (411) on its inner end face, and the second slide valve (32) has an installation groove 2 (421) on its inner end face. The side wall of the first installation groove (411) is provided with a first slide groove (412), and the side wall of the second installation groove (421) is provided with a seventh slide groove (423). The side wall of the first installation groove (411) is provided with a first annular limiting groove (413), and the side wall of the second installation groove (421) is provided with a second annular limiting groove (422). The first connecting sleeve (41) is equipped with a fixing mechanism (6), which includes two fixing rings (61). The two fixing rings (61) are fixedly connected in the first connecting sleeve (41) and the second connecting sleeve (42) respectively. The ends of the two fixing rings (61) that are far apart from each other are fixedly connected to arc-shaped limiting blocks (62). The two fixing rings (61) are respectively inserted into the first mounting groove (411) and the second mounting groove (421). One of the arc-shaped limiting blocks (62) is slidably connected to the first annular limiting groove (413) through the first sliding groove (412), and the other arc-shaped limiting block (62) is slidably connected to the second annular limiting groove (422) through the seventh sliding groove (423).

3. The flow control device for the pneumatically controlled directional valve according to claim 2, characterized in that, The arc-shaped limiting block (62) has a second sliding groove (621) at one end away from the fixing ring (61). The fixing mechanism (6) also includes an anti-detachment component (63). The anti-detachment component (63) includes an anti-detachment spring (632). The anti-detachment spring (632) is fixedly connected to the bottom wall of the second sliding groove (621). A second sliding rod (631) is slidably connected in the second sliding groove (621). The second sliding rod (631) is fixedly connected to the anti-detachment spring (632).

4. The flow control device for the pneumatically controlled directional valve according to claim 2, characterized in that, The first connecting sleeve (41) and the second connecting sleeve (42) are provided with a third sliding groove (47) on their side walls. The bottom wall of the third sliding groove (47) is provided with a fourth sliding groove (48). The valve body (1) is provided with a first limiting groove (111), a second limiting groove (112), a third limiting groove (113) and a fourth limiting groove (114) on its inner side wall. The first connecting sleeve (41) and the second connecting sleeve (42) are both equipped with a limiting mechanism (5). The limiting mechanism (5) includes a limiting ball (51). The limiting ball (51) is slidably connected in the third sliding groove (47). The fourth sliding groove (48) is equipped with a spring-loaded assembly (52). The spring-loaded assembly (52) is rotatably connected to the limiting ball (51).

5. The flow control device for the pneumatically controlled directional valve according to claim 4, characterized in that, The rebound assembly (52) includes a sliding plate (521), which is slidably connected in the fourth slide groove (48) and rotatably connected to the limiting ball (51). A first fixing seat (523) is fixedly connected to the bottom wall of the fourth slide groove (48). A fifth slide groove (525) is opened on the end face of the first fixing seat (523) near the sliding plate (521). A limiting spring (524) is fixedly connected to the bottom wall of the fifth slide groove (525). A first sliding rod (522) is also slidably connected in the fifth slide groove (525). The two ends of the first sliding rod (522) are fixedly connected to the sliding plate (521) and the limiting spring (524) respectively.

6. The flow control device for the pneumatically controlled directional valve according to claim 1, characterized in that, A reset mechanism (7) is also installed on the valve body (1). The reset mechanism (7) includes a second fixed seat (71), which is fixedly connected to the valve body (1). A sixth sliding groove (711) is provided on the end face of the second fixed seat (71) away from the valve body (1). A reset spring (73) is fixedly connected to the bottom wall of the sixth sliding groove (711). A sliding sleeve (72) is slidably connected in the sixth sliding groove (711). The sliding sleeve (72) is fixedly connected to the transmission rod (2) and to the reset spring (73).

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