CN214367953U - Slow-falling control air valve - Google Patents

Abstract

The utility model relates to a tipper is to the control valve control, especially indicates a control valve falls slowly. A lifting valve core is arranged in a lifting valve hole on the valve body, a gear positioning clamping groove which corresponds to a station and is matched with the lower end of the handle is arranged on the control cover, a corresponding process through hole and a working air port are respectively arranged on the valve body, a steel ball, a descending valve core, a descending core spring and a second sealing and blocking assembly are arranged in the descending valve hole from top to bottom, and an ejector rod, an air guide sleeve, an ejector rod spring, a reversing core sleeve and a reversing core spring are arranged in the slow descending valve hole from top to bottom; the air inlet is communicated with the cavity at the lower part of the lifting and descending valve hole through the process through hole, the lifting, descending and slow descending air ports are connected with the corresponding working cavities through the process through hole, and the exhaust ports are respectively connected with the upper part of the lifting, descending and slow descending valve hole and then are opened outside the valve body; the cam handle is provided with a slow-down working surface and a lifting and descending working surface. The utility model provides a current product physique great, can not satisfy trade development needs scheduling problem, have compact structure, be suitable for advantages such as diversified installation.

Description

Slow-falling control air valve

Technical Field

The utility model relates to a tipper is to the control valve control, especially indicates a control valve falls slowly.

Background

The utility model with the patent number 201620467607.5 discloses a slow-lowering reversing valve, the main technical structure of which comprises a hand control device assembled on the top end of a cam rod and composed of a handle and a handle ball, the handle and a working groove and a station adaptation arranged on the surface of an operating panel arranged on the cam, a valve body is arranged below the cam and longitudinally distributed in the valve body, a first valve hole and a second valve hole are arranged at intervals in parallel, the lower ends of the first valve hole and the second valve hole are respectively and correspondingly packaged with a first sealing plug and a second sealing plug, a lifting top core is arranged in the second valve hole, the top of the lifting top core is in elastic top press fit with the lower end of the cam and axially limited through the inner surface of the operating panel, the middle part of the lifting top core is in sealing assembly with the inner wall of the second valve hole and longitudinally provided with an air hole in the inner part of the lifting top core, and the valve body is respectively provided with a working air passage and a working interface which correspond to the adaptation; the station comprises a lifting station, a middle stop positioning hole, a slow-descending positioning hole and a descending positioning hole which are sequentially arranged on the surface of the working groove at intervals, a pressing sleeve and a sealing ejector core are sequentially arranged in the first valve hole from top to bottom, the pressing sleeve is hollow and axially limited by the inner surface of the operating panel, the pressing sleeve is assembled on the upper part of the first valve hole in a sealing and sliding mode through a first sealing ring, the upper part of the sealing ejector core is respectively extruded and sealed with the pressing sleeve and the lower end of the ejector core, the ejector core is coaxially sleeved in a cavity in the pressing sleeve and sealed with the upper part of the pressing sleeve through a second sealing ring, a steel ball is arranged between the ejector core and the bottom of the cam, and a spring is arranged between the ejector core and the sealing ejector core; the inside of the sealing top core is provided with a vent hole in a through way; the working air passage comprises a lifting air passage, a descending air passage, a slow descending air passage and an air inlet passage which are arranged on the valve body and are not communicated with each other, the inner end of the air inlet passage is respectively communicated with a first sealing plug and a first valve hole, and a sealing cavity formed by a second sealing plug and a second valve hole, the inner end of the lifting air passage is communicated with a second valve hole between a third sealing ring and the second sealing plug, the inner end of the descending air passage is communicated with a first valve hole inner cavity between a lower sealing ring and the first sealing plug, and the inner end of the slow descending air passage is communicated with a first valve hole inner cavity between an upper sealing ring and a lower sealing ring; the cam is respectively provided with a first cam curved surface and a second cam curved surface which correspond to the steel ball and the pressing sleeve, wherein the first cam curved surface corresponds to the steel ball and is clamped between the second cam curved surfaces which are arranged at intervals, and the second cam curved surfaces respectively correspond to two sides of the upper surface of the pressing sleeve. The problems of the prior art mainly include: firstly, the valve body is formed by adding an aluminum profile machine, the control cover can not be subjected to embedded installation due to the limitation of a profile forming process, and the valve body has a relatively large shape; secondly, with the change of application environment and the continuous improvement of customer requirements, new requirements are put forward on the miniaturization of the valve, the function integration and the diversification of the installation mode, so that the components can still meet the long-time use while the overall dimension of the components is reduced, and the main direction of the structural design optimization of the product is also provided; thirdly, as the pressing sleeve, the steel ball and the sealing top core adopt a coaxial sleeved structural design, the descending and slow descending function conversion is realized through the segmental descending of the parts, the sectional area of the pressing sleeve positioned on the outer side is larger on the premise of meeting the accommodation of the internal parts, the descending driving power of the parts is larger under the action of air pressure, and the friction loss between the cam and the pressing sleeve is increased; fourthly, the sealing top core moves upwards under the action of the spring and realizes end face sealing with the lower end of the pressing sleeve, and the sealing top core cannot ensure the verticality of a sealing face in the movement process due to the fact that the spring does not have a guiding function, so that the sealing effect cannot be effectively ensured; fifthly, the pressing sleeve and the sealing ejection core have different upward acting forces, so that the difficulty of entering a corresponding station is increased due to uneven operating force when the handle is pushed, and the phenomenon of slippage and dislocation caused by sudden change of stress is easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model provides a control air valve falls slowly realizes through configuration optimization that the product is miniaturized, the mounting means is diversified, the sealing reliability is good, the operation is light and the degree of accuracy is high purpose.

The utility model discloses an overall technology structure is:

the slow-falling control air valve comprises a handle ball assembled at the top end of a cam handle rod, a valve body is arranged below a cam handle, the interior of the valve body is longitudinally distributed and is provided with valve holes at intervals in parallel, a lifting valve core is arranged in the lifting valve hole, the top end of the lifting valve core is elastically pressed and matched with the lower end of the cam handle and is axially limited by an operating cover cap fixed on the surface of the valve body, an air hole is longitudinally formed in an inner cavity in the middle of the lifting valve core, a lifting core spring is arranged between the outer side of the lifting valve core and a boss of the inner cavity of the lifting valve hole, a sealing member is arranged at the adjacent part of the lifting core spring and the boss of the inner cavity of the lifting valve hole, a gear positioning clamping groove corresponding to a station and matched with the lower end of the handle is arranged on the operating cover cap, a first sealing blocking assembly is arranged at the bottom of the lifting valve hole, the valve body is respectively provided with a corresponding process through hole and a working air port, and the working air port comprises a lifting air port, a descending air port, a slow-falling air port and an air inlet; still include the following structure:

A. a steel ball, a descending valve core, a descending core spring and a second sealing and blocking assembly are sequentially arranged in the descending valve hole from top to bottom, the descending core spring is arranged between the descending valve core and a boss at the lower end of the descending valve hole, sealing members are arranged on the adjacent parts of the descending core spring and the boss, and the upper surface and the lower surface of the steel ball are respectively attached to the working surface of the cam handle and the top end of the descending valve core; the top end of the ejector rod is attached to the working surface of a cam handle, the top of the air guide sleeve is clamped and positioned by a control cover cap, a sealing component is arranged at the outer side of the lower end of the air guide sleeve and the inner surface of the slow-falling valve hole, the ejector rod spring is arranged between the ejector rod and a boss at the lower end of the air guide sleeve, the reversing core spring is arranged between the outer side of the lower part of the reversing core sleeve and the inner cavity of the slow-falling valve hole, and the sealing component is arranged at the adjacent part of the reversing core sleeve and the lower end of the air guide sleeve;

B. the air inlet is respectively communicated with a cavity at the lower part of the lifting valve hole and the descending valve hole through an air inlet process through hole, the lifting air hole is communicated with a lifting valve hole inner cavity positioned below the lifting valve core and a lifting valve hole sealing member through a lifting process through hole, the descending air hole is communicated with a descending valve hole inner cavity positioned below a sealing member between the descending valve core and the descending valve hole through a descending process through hole, the slow descending air hole is communicated with an inner cavity formed by an air guide sleeve, a reversing core sleeve and a slow descending valve hole through a slow descending process through hole, a descending valve hole inner cavity positioned below the sealing member between the descending valve core and the descending valve hole is communicated with a cavity positioned below the sealing member between the reversing core sleeve and the air guide sleeve through a slow descending process through hole, and the air outlet is respectively communicated with the lifting valve hole, the descending valve hole and the upper part of the slow descending valve hole and then is opened outside the valve body;

C. the cam handle is respectively provided with a cam slow-down working surface and a cam lifting and descending working surface, the cam slow-down working surface corresponds to the steel ball, and the cam lifting and descending working surface corresponds to the lifting valve core and the ejector rod.

The concrete technical structure of the utility model comprises:

in order to facilitate the realization of the matching of the control cover cap and the handle and the obvious distinction of stations, the preferable technical realization means is that a gear positioning clamping groove arranged on the control cover cap is matched with the lower end of the handle, and a lifting station, a middle stop clamping groove, a slow-down clamping groove and a descending clamping groove are sequentially arranged on the surface of the gear positioning clamping groove at intervals.

In order to realize the effect of the lifting core spring on the lifting valve core, the preferred technical realization means is that the lifting core spring is arranged between the upper part of the lifting valve core and a boss in the middle of an inner cavity of the lifting valve hole.

In order to realize safe self-locking after the work conversion of the handle, the preferable technical implementation means is that the handle ball is fixed at the top end of the cam handle through a cylindrical nut, a handle spring is sleeved on the surface of the cam handle between the bottom end of the handle ball and the handle, and the handle is sleeved outside the cam handle in a sliding fit mode.

The sealing member is mainly used for realizing separation to form different isolation cavities and finishing different function switching, and the preferable technical realization means is that the sealing member arranged at the adjacent part of the descending valve core and the descending valve hole, the sealing member arranged at the adjacent part of the lifting valve core and the lifting valve hole and the sealing member arranged at the adjacent part of the outer side of the lower end of the air guide sleeve and the inner surface of the slow descending valve hole are provided with first radial O-shaped sealing rings; a second radial O-shaped sealing ring is arranged at the joint of the outer surface of the ejector rod and the reversing core sleeve, a third radial O-shaped sealing ring matched with the conical surface of the lower end of the ejector rod is arranged at the bottom of the inner surface of the reversing core sleeve, and an axial O-shaped sealing ring is adopted as a sealing member arranged at the joint of the reversing core sleeve and the lower end of the air guide sleeve.

The valve body surface-fixed actuating cover is preferably realized in the technical manner that the actuating cover is fixed to the valve body surface by fixing screws.

In order to realize the matching of the cam handle and the operating cover cap, meet the positioning requirement of the cam handle and reduce the motion friction force between the cam handle and the adjacent parts, the preferable technical realization means is that the cylindrical pin penetrates through the cam handle and then two ends of the cylindrical pin are assembled in the positioning clamping groove of the inner cavity of the operating cover cap.

In order to realize the diversity of installation, the preferable technical implementation means is that the outer side wall of the valve body is provided with a side screw hole and an embedded screw hole.

In order to realize the arrangement of the working air ports and the design of pipelines, the preferable arrangement mode of the working air ports on the valve body is that the lifting air ports, the descending air ports, the slow descending air ports and the air inlet ports are arranged on the lower end face of the valve body.

The working principle of the utility model is as follows:

and in the middle stop state, the handle moves downwards under the action of the handle spring, the lower end of the handle enters a middle stop clamping groove of the gear positioning clamping groove to realize locking, the first sealing plug assembly and the second sealing plug assembly are in a closed state, the lifting air port, the slow-falling air port and the falling air port are communicated with the outside through corresponding process through holes and exhaust ports, and the pneumatic control reversing valve communicated with the lifting air port, the slow-falling air port and the falling air port is in a middle stop state under the action of no external force.

Lifting state: the handle is pulled to the gear positioning clamping groove to release the locking on the lower end of the handle, the handle ball is pulled to the lifting station, the cam lifting and descending working surface of the cam handle pushes the lifting valve core to move downwards and jack the first sealing plug assembly, the inner cavity of the lifting valve hole is communicated with the lifting air port through the lifting process through hole, and compressed air acts on the pneumatic control reversing valve connected with the lifting air port to enable the pneumatic control reversing valve to be in a lifting state.

Slow-down state: the handle is pulled up to the gear positioning clamping groove to release the locking of the lower end of the handle, the handle ball is pulled to the slow-falling clamping groove, the cam slow-falling working face of the cam handle pushes the descending valve core to move downwards through the steel ball and jacks up the second sealing and blocking assembly, the inner cavity of the descending valve hole and the cavity below the sealing part of the reversing core sleeve and the slow-falling valve hole are communicated through a slow-falling process through hole, the slow-falling air hole is communicated with the air guide sleeve and the inner cavity between the reversing core sleeve and the sealing part of the inner surface of the slow-falling valve hole through the slow-falling process through hole, so that the slow-falling air hole and the descending air hole are communicated simultaneously, and the slow-falling piston and the reversing piston in the pneumatic control reversing valve driven by the slow-falling air hole are in slow falling when the slow-falling piston and the reversing piston work simultaneously.

A descending state: the handle is pulled up to the gear positioning clamping groove to release the locking on the lower end of the handle, the handle ball is pulled to the descending clamping groove, the cam of the cam handle lifts and the descending working surface pushes the ejector rod to move downwards, the conical surface at the bottom of the ejector rod is sealed with the third radial O-shaped sealing ring, the reversing core sleeve moves downwards at the same time, the axial O-shaped sealing ring between the reversing core sleeve and the air guide sleeve releases the sealing effect, the slow descending air port is communicated with the air exhaust port through the slow descending process through hole, the slow descending piston in the pneumatic reversing valve is reset in a decompression mode, the working state of the reversing piston is kept unchanged at the moment, and the reversing pneumatic control valve is in descending.

The technical progress of the utility model lies in:

1. the utility model discloses set out the optimal design from improving spare part atress situation and gas circuit overall arrangement, can effectively reduce the manual control power and reduce the size specification of spare part under the prerequisite that satisfies the working requirement, and then reduce the whole volume of valve, for diversified and miniaturized, the integration of installation has established the basis, can satisfy operating condition's stability and reduce spare part mechanical wear simultaneously, accords with this product structural design optimization direction requirement.

2. The utility model integrates the cam slow-falling working surface and the cam lifting and falling working surface into one cam by optimizing the structural design of the cam handle and the cam working surface, so that the structural design is more compact on the basis of meeting the function; the descending and slow descending functions are realized through the two independent and mutually associated cavities, the structural complexity of the functional cavities is simplified, and the operation reliability of parts is improved.

3. The utility model discloses in adopt the seal structure of multiple forms such as radial seal, axial seal, conical surface seal, lift case, decline case, ejector pin, switching-over core cover and all adopt the direction sliding fit under the radial seal, improved radial seal's validity, owing to hang down straightness and has obtained guaranteeing and then realized spare part axial seal's reliability simultaneously.

4. The utility model discloses well slow falling control air valve lift, descend, slow falling, well stop to adopt relatively independent structure to realize, do not have obvious operating force to change when the structural element action that corresponds under each operating condition, corresponding station conversion is simple and be difficult for producing the maloperation.

5. The utility model discloses set up the side at the valve body lateral wall and adorn the structural design of screw and inlay the dress screw, satisfy different assembly methods needs such as fixed plate and embedded installation, provide the design space for engineering truck driver's cabin overall arrangement improvement.

Drawings

Fig. 1 is an external view of the present invention.

Fig. 2 is a bottom view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a left side view of fig. 1.

Fig. 5 is a view from a-a of fig. 1.

Fig. 6 is a view from B-B of fig. 4.

Fig. 7 is a view in the direction of C-C of fig. 6.

Fig. 8 is a view from direction F-F of fig. 6.

Fig. 9 is a view from direction D-D of fig. 6.

Fig. 10 is a view from E-E of fig. 6.

Fig. 11 is an external view of the cam.

Fig. 12 is a right side view of fig. 10.

Fig. 13 is a left side view of fig. 10.

Fig. 14 is a perspective view of the cam.

The reference numbers in the drawings are as follows:

t-1, a lifting gas port; t-1-1, lifting a process through hole; t-2, a slow descending port; t-2-1, slowly lowering the process through hole; t-3, descending gas port; t-3-1 descending process through holes; t-4, an air inlet; t-4-1, air inlet process through holes; t-5, side mounting screw holes; t-6, an exhaust port; t-6-1, exhaust port process through holes; t-7, embedding a screw hole; t-8, a gear positioning clamping groove; h-1, a cam slowly-descending working surface; h-2, lifting and lowering a working surface by a cam; f-1, lifting valve hole; f-2, a drop valve hole; f-3, a slow-decreasing valve hole; m-1, a first sealing component; m-2, a second sealing component; 1. a steel ball; 2. a lowering spool; 3. a drop core spring; 4. a handle ball; 5. a handle spring; 6. a handle; 7. a cam handle; 8. operating the cover; 9. a valve body; 10. a cylindrical nut; 11. a cylindrical pin; 12. lifting the valve core; 13. a set screw; 14. a lift core spring; 15A, a first radial O-shaped sealing ring; 15B, a second radial O-shaped sealing ring; 15C, a third radial O-shaped sealing ring; 16. a reversing core spring; 17. a top rod; 18. a gas guide sleeve; 19. a push rod spring; 20. an axial O-shaped seal ring; 21. the reversing core sleeve.

Detailed Description

The accompanying drawings illustrate embodiments of the present invention, and together with the description, further description of the embodiments of the invention will be given below without limiting the scope of the invention, which is defined by the appended claims.

The whole structure of the embodiment is shown in the figure, and comprises a handle ball 8 assembled at the top end of a cam handle 7, a valve body 9 is arranged below the cam handle 7, the interior of the valve body is longitudinally distributed and parallelly provided with valve holes at intervals, a lifting valve core 12 is arranged in a lifting valve hole F-1, the top end of the lifting valve core 12 is elastically pressed and matched with the lower end of the cam handle 7 and is axially limited by an operating cover 8 fixed on the surface of the valve body 9, an air hole is longitudinally formed in the inner cavity in the middle of the lifting valve core 12, a lifting core spring 14 is arranged between the outer side of the lifting valve core 12 and an inner cavity boss of the lifting valve hole F-1, the adjacent part of the lifting valve core spring and the boss is provided with a sealing component, a gear positioning clamping groove T-8 corresponding to a station and matched with the lower end of a handle 6 is arranged on the operating cover 8, a first sealing and blocking component M-1 is arranged at the bottom of the lifting valve hole F-1, and the valve body 9 is respectively provided with a corresponding process through hole and a working air hole, the working air ports comprise a lifting air port T-1, a descending air port T-3, a slow descending air port T-2 and an air inlet T-4; still include the following structure:

A. a steel ball 1, a descending valve core 2, a descending core spring 3 and a second sealing plug component M-2 are sequentially arranged in the descending valve hole F-2 from top to bottom, the descending core spring 3 is arranged between the descending valve core 2 and a boss at the lower end of the descending valve hole F-2, sealing members are arranged at the adjacent parts of the descending core spring 3 and the boss, and the upper surface and the lower surface of the steel ball 1 are respectively attached to the working surface of a cam handle 7 and the top end of the descending valve core 2; an ejector rod 17, an air guide sleeve 18, an ejector rod spring 19, a reversing core sleeve 21 and a reversing core spring 16 are sequentially arranged in the slow-falling valve hole F-3 from top to bottom, wherein the top end of the ejector rod 17 is attached to the working surface of the cam handle 7, the top of the air guide sleeve 18 is clamped and positioned by an operating cover cap 8, a sealing member is arranged at the adjacent part of the outer side of the lower end of the air guide sleeve 18 and the inner surface of the slow-falling valve hole F-3, the ejector rod spring 19 is arranged between the ejector rod 17 and a boss at the lower end of the air guide sleeve 18, the reversing core spring 16 is arranged between the outer side of the lower part of the reversing core sleeve 21 and the inner cavity of the slow-falling valve hole F-3, and the adjacent part of the lower end of the reversing core sleeve 21 and the air guide sleeve 18 is provided with the sealing member;

B. the air inlet T-4 is respectively communicated with the cavity at the lower part of the lifting valve hole F-1 and the cavity at the lower part of the descending valve hole F-2 through an air inlet process through hole T-4-1, the lifting air hole T-1 is communicated with the cavity of the lifting valve hole F-1 positioned below a sealing member of the lifting valve core 12 and the lifting valve hole F-1 through the lifting process through hole T-1-1, the descending air hole T-3 is communicated with the cavity of the descending valve hole F-2 positioned below a sealing member between the descending valve core 2 and the descending valve hole F-2 through a descending process through hole T-3-1, the slow descending air hole T-2 is communicated with the cavity formed by the air guide sleeve 18, the reversing core sleeve 21 and the slow descending valve hole F-3 through a slow descending process through hole T-2-1, and the cavity of the descending valve hole F-2 positioned below the sealing member between the descending valve core 2 and the reversing core sleeve 21 and the air guide sleeve The cavity below the sealing component between 18 is communicated with a slow-falling process through hole T-2-1, and the exhaust port T-6 is communicated with the upper parts of the lifting valve hole F-1, the descending valve hole F-2 and the slow-falling valve hole F-3 through the exhaust port process through hole T-6-1 and then is opened outside the valve body 9;

C. the cam handle 7 is respectively provided with a cam slow-down working surface H-1 and a cam lifting and descending working surface H-2, the cam slow-down working surface H-1 corresponds to the steel ball 1, and the cam lifting and descending working surface H-2 corresponds to the lifting valve core 12 and the ejector rod 17.

A gear positioning clamping groove T-8 arranged on the control cover cap 8 is matched with the lower end of the handle 6, and a lifting station, a middle stop clamping groove, a slow-falling clamping groove and a falling clamping groove are sequentially arranged on the surface of the gear positioning clamping groove T-8 at intervals.

The lifting core spring 14 is arranged between the upper part of the lifting valve core 12 and a boss in the middle of the inner cavity of the lifting valve hole F-1.

The handle ball 4 is fixed on the top end of the cam handle 7 through the cylindrical nut 10, the surface of the cam handle 7 between the bottom end of the handle ball 4 and the handle 6 is sleeved with the handle spring 5, and the handle 6 is sleeved on the outer side of the cam handle 7 in sliding fit.

A sealing member arranged at the adjacent part of the descending valve core 2 and the descending valve hole F-2, a sealing member arranged at the adjacent part of the lifting valve core 12 and the lifting valve hole F-1, and a sealing member arranged at the adjacent part of the outer side of the lower end of the air guide sleeve 18 and the inner surface of the slow descending valve hole F-3 are provided with a first radial O-shaped sealing ring 15A; a second radial O-shaped sealing ring 15B is arranged at the position where the outer surface of the ejector rod 17 is adjacent to the reversing core sleeve 21, a third radial O-shaped sealing ring 15C matched with the conical surface of the lower end of the ejector rod 17 is arranged at the bottom of the inner surface of the reversing core sleeve 21, and an axial O-shaped sealing ring 20 is adopted as a sealing component arranged at the adjacent part of the lower end of the reversing core sleeve 21 and the lower end of the air guide sleeve 18.

The actuating cover 8 is fixed to the surface of the valve body 9 by fixing screws 13.

The cylindrical pin 11 passes through the cam handle 7 and then two ends of the cylindrical pin are assembled in the positioning clamping groove of the inner cavity of the control cover 8.

In order to realize the installation diversity, the preferable technical implementation means is that the outer side wall of the valve body 9 is provided with a side screw hole T-5 and an embedded screw hole T-7.

The lifting air port T-1, the descending air port T-3, the slow descending air port T-2 and the air inlet T-4 are arranged on the lower end face of the valve body 9.

Claims (9)

1. A slow-falling control air valve comprises a handle ball (4) assembled at the top end of a cam handle (7), a valve body (9) is arranged below the cam handle (7) and is longitudinally distributed in the valve body, valve holes are formed in parallel at intervals, a lifting valve core (12) is arranged in the lifting valve hole (F-1), the top end of the lifting valve core (12) is elastically pressed and matched with the lower end of the cam handle (7) and is axially limited through an operating cover cap (8) fixed on the surface of the valve body (9), an air hole is longitudinally formed in the middle inner cavity of the lifting valve core (12), a lifting core spring (14) is arranged between the outer side of the lifting valve core (12) and an inner cavity boss of the lifting valve hole (F-1), sealing members are arranged at adjacent parts of the lifting valve core spring and the lifting valve cover cap and the operating cover cap, a gear positioning clamping groove (T-8) corresponding to a station and matched with the lower end of a handle (6) is arranged on the operating cover cap (8), a first sealing and blocking assembly (M-1) is arranged at the bottom of the lifting valve hole (F-1), the valve body (9) is respectively provided with a corresponding process through hole and a corresponding working air port, and the working air port comprises a lifting air port (T-1), a descending air port (T-3), a slow descending air port (T-2) and an air inlet (T-4); the method is characterized in that:

A. a steel ball (1), a descending valve core (2), a descending core spring (3) and a second sealing and blocking assembly (M-2) are sequentially arranged in the descending valve hole (F-2) from top to bottom, the descending core spring (3) is arranged between the descending valve core (2) and a boss at the lower end of the descending valve hole (F-2), sealing members are arranged on adjacent parts of the descending core spring and the boss, and the upper surface and the lower surface of the steel ball (1) are respectively attached to the working surface of a cam handle (7) and the top end of the descending valve core (2); an ejector rod (17), an air guide sleeve (18), an ejector rod spring (19), a reversing core sleeve (21) and a reversing core spring (16) are sequentially arranged in the slow-falling valve hole (F-3) from top to bottom, wherein the top end of the ejector rod (17) is attached to the working surface of the cam handle (7), the top of the air guide sleeve (18) is clamped and positioned by an operating cover cap (8), a sealing member is arranged at the outer side of the lower end of the air guide sleeve (18) and the adjacent part of the inner surface of the slow-falling valve hole (F-3), the ejector rod spring (19) is arranged between the ejector rod (17) and the boss at the lower end of the air guide sleeve (18), the reversing core spring (16) is arranged between the outer side of the lower part of the reversing core sleeve (21) and the inner cavity of the slow-falling valve hole (F-3), and the adjacent part of the lower end of the reversing core sleeve (21) and the air guide sleeve (18) is provided with the sealing member;

B. the air inlet (T-4) is respectively communicated with a cavity at the lower part of the lifting valve hole (F-1) and the lower part of the descending valve hole (F-2) through an air inlet process through hole (T-4-1), the lifting air port (T-1) is communicated with an inner cavity of the lifting valve hole (F-1) positioned below a sealing member of the lifting valve core (12) and the lifting valve hole (F-1) through the lifting process through hole (T-1-1), the descending air port (T-3) is communicated with an inner cavity of the descending valve hole (F-2) positioned below a sealing member between the descending valve core (2) and the descending valve hole (F-2) through the descending process through hole (T-3-1), and the slow descending air port (T-2) is communicated with an inner cavity formed by the air guide sleeve (18), the reversing core sleeve (21) and the slow descending valve hole (F-3) through the slow descending process through hole (T-2-1), the inner cavity of the descending valve hole (F-2) positioned below a sealing member between the descending valve core (2) and the descending valve hole (F-2) is communicated with the cavity positioned below the sealing member between the reversing core sleeve (21) and the air guide sleeve (18) through a slow descending process through hole (T-2-1), and the exhaust port (T-6) is communicated with the upper parts of the lifting valve hole (F-1), the descending valve hole (F-2) and the slow descending valve hole (F-3) through an exhaust port process through hole (T-6-1) respectively and then is opened outside the valve body (9);

C. the cam handle (7) is respectively provided with a cam slow-down working surface (H-1) and a cam lifting and descending working surface (H-2), the cam slow-down working surface (H-1) corresponds to the steel ball (1), and the cam lifting and descending working surface (H-2) corresponds to the lifting valve core (12) and the ejector rod (17).

2. The slow-falling control air valve according to claim 1, characterized in that a gear positioning clamping groove (T-8) arranged on the control cover cap (8) is matched with the lower end of the handle (6), and a lifting station, a middle stopping clamping groove, a slow-falling clamping groove and a falling clamping groove are sequentially arranged on the surface of the gear positioning clamping groove (T-8) at intervals.

3. The slow-falling control air valve according to claim 1, characterized in that the lifting core spring (14) is arranged between the upper part of the lifting valve core (12) and a boss in the middle of the inner cavity of the lifting valve hole (F-1).

4. The slow descent control air valve according to claim 1, characterized in that the handle ball (4) is fixed at the top end of the cam handle (7) through a cylindrical nut (10), a handle spring (5) is sleeved on the surface of the cam handle (7) between the bottom end of the handle ball (4) and the handle (6), and the handle (6) is sleeved and matched with the cam handle (7) in a sliding manner.

5. The slow-falling control gas valve according to claim 1, characterized in that the sealing member arranged at the adjacent part of the descending valve core (2) and the descending valve hole (F-2), the sealing member arranged at the adjacent part of the lifting valve core (12) and the lifting valve hole (F-1), and the sealing member arranged at the adjacent part of the outer side of the lower end of the gas guide sleeve (18) and the inner surface of the slow-falling valve hole (F-3) are selected from a first radial O-shaped sealing ring (15A); a second radial O-shaped sealing ring (15B) is arranged at the joint of the outer surface of the ejector rod (17) and the reversing core sleeve (21), a third radial O-shaped sealing ring (15C) matched with the conical surface of the lower end of the ejector rod (17) is arranged at the bottom of the inner surface of the reversing core sleeve (21), and an axial O-shaped sealing ring (20) is adopted as a sealing member arranged at the joint of the lower end of the reversing core sleeve (21) and the air guide sleeve (18).

6. Slow drop control valve according to claim 1, characterised in that the operating cover (8) is fixed to the surface of the valve body (9) by means of fixing screws (13).

7. The slow descent control gas valve as claimed in claim 1, wherein the cylindrical pin (11) passes through the cam handle (7) and is fitted at the rear end thereof into a positioning slot in the inner cavity of the operating cover (8).

8. The slow descending control air valve according to claim 1, characterized in that the outer side wall of the valve body (9) is provided with a side mounting screw hole (T-5) and an embedded screw hole (T-7).

9. The slow-falling control gas valve according to claim 1, characterized in that the lifting gas port (T-1), the falling gas port (T-3), the slow-falling gas port (T-2) and the gas inlet (T-4) are arranged on the lower end surface of the valve body (9).

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