阅读说明：本技术 慢降控制气阀 (Slow-falling control air valve ) 是由 郑玉涛 黄建安 石东奎 刘东凡 苏龙宾 于 2021-02-09 设计创作，主要内容包括：本发明涉及自卸车对控制气阀的控制,特别是指一种慢降控制气阀。阀体上举升阀孔内设举升阀芯,操纵罩盖上设有与工位对应且与手柄下端适配的挡位定位卡槽,阀体上分别设有对应的工艺通孔及工作气口,下降阀孔内自上至下设有钢球、下降阀芯、下降芯弹簧及第二密封堵组件,慢降阀孔内自上之下设有顶杆、导气套、顶杆弹簧、换向芯套、换向芯弹簧；进气口经工艺通孔连通举升及下降阀孔下部空腔,举升、下降、慢降气口经工艺通孔接相应工作腔,排气口分别接举升、下降及慢降阀孔上部后开口于阀体外；凸轮手把上设有慢降工作面和举升及下降工作面。本发明解决了现有产品形体较大、不能满足行业发展需要等问题,具有结构紧凑、适于多样化安装等优点。(The invention relates to control of a dumper on a control air valve, in particular to a slow-descending control air valve. 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 cap, 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 a mandril, an air guide sleeve, a mandril 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 invention solves the problems that the existing product has a larger shape and can not meet the development requirements of the industry, and the like, and has the advantages of compact structure, suitability for diversified installation and the like.)

1. A slow-falling control air valve 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) 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), 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);

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, 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).

Technical Field

The invention relates to control of a dumper on a control air valve, in particular to a slow-descending control air valve.

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 the working groove and the station adaptation arranged on the surface of an operating panel arranged on the cam, a valve body is arranged below the cam and the internal longitudinal distribution of 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 the internal longitudinal air hole is provided with an air hole, and; the working position comprises a lifting working position, 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 top core are sequentially arranged in the first valve hole from top to bottom, the inside of the pressing sleeve is hollow and is 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 top core is respectively extruded and sealed with the pressing sleeve and the lower end of the top core, the top 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 top core and the bottom of the cam; 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 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 upward acting forces of the pressing sleeve and the sealing top core are different, 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 slipping and dislocation caused by sudden change of stress is easy to occur.

Disclosure of Invention

The invention provides a slow-falling control air valve which achieves the purposes of product miniaturization, diversified installation modes, good sealing reliability, convenience in operation, high accuracy and the like through structural optimization.

The invention has the following overall technical structure:

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 the cam handle and longitudinally distributed in the valve body, valve holes are formed in the valve body 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 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 in the inner cavity of the lifting valve hole, a sealing component is arranged at the adjacent part of the lifting core spring and the boss, 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 component is arranged at the bottom of the; still include the following structure:

A. a steel ball, a descending valve core, a descending core spring and a second sealing plug 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, a sealing component is arranged at the adjacent part of the descending core spring and the boss at the lower end of the descending valve hole, 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 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 valve 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 valve 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 valve hole is communicated with an inner cavity formed by the air guide sleeve, the reversing core sleeve and the 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 and a cavity positioned below the sealing member between the reversing core sleeve and the air guide sleeve are communicated through a slow descending process through hole, and the air outlet is respectively communicated with the lifting valve;

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 specific technical structure of the invention comprises:

in order to facilitate the realization of the adaptation of the control cover cap and the handle and the obvious distinction of stations, the preferable technical implementation means is that a gear positioning clamping groove arranged on the control cover cap is adapted to 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 manner.

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 position where the outer surface of the ejector rod is adjacent to the reversing core sleeve, a third radial O-shaped sealing ring matched with the conical surface at 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 component arranged at the adjacent part of the lower end of the reversing core sleeve and the air guide sleeve.

The valve body surface-fixed actuating cover is preferably realized in the technical way that the actuating cover is fixed with 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 two ends of the cylindrical pin penetrate through the cam handle and 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-mounted 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 invention 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 of the lower end of the handle, the handle ball is pulled to a 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.

A descending state: the handle is pulled to the gear positioning clamping groove to release the locking of 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 pneumatic reversing valve.

The invention achieves the substantive characteristics and obvious technical progress that:

1. the invention carries out optimization design by improving the stress condition of parts and the gas circuit layout, can effectively reduce the manual operating force and reduce the size specification of the parts on the premise of meeting the working requirement, further reduces the overall volume of the valve, lays a foundation for the diversification, miniaturization and integration of installation, can meet the stability of the working state and reduce the mechanical abrasion of the parts, and meets the requirement of the structural design optimization direction of the product.

2. According to the invention, the structural design of the cam handle and the cam working surface is optimized, and the cam slow-down working surface and the cam lifting and lowering working surface are integrated on one cam, 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 invention adopts a plurality of sealing structures such as radial sealing, axial sealing, conical surface sealing and the like, and the lifting valve core, the descending valve core, the ejector rod and the reversing core sleeve are all in guide sliding fit under the radial sealing, thereby improving the effectiveness of the radial sealing, and simultaneously realizing the reliability of the axial sealing of parts because the verticality is ensured.

4. The lifting, descending, slow descending and intermediate stopping of the slow descending control air valve are realized by adopting relatively independent structures, the corresponding structural elements in each working state do not have obvious operating force change when acting, the corresponding stations are simple to switch, and misoperation is not easy to generate.

5. The side-mounted screw hole and the embedded screw hole are formed in the outer side wall of the valve body, so that the requirements of different assembling modes such as a fixing plate and embedded installation are met, and a design space is provided for improving the layout of a cab of an engineering truck.

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, an air inlet process through hole; 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 seal assembly; 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 are included to provide a further understanding of the embodiments of the invention, and are incorporated in and constitute a part of this specification.

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 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, 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;

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 The cavity below the sealing component between the valve body 21 and the air guide sleeve 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-descending clamping groove and a descending 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 outside of the cam handle 7 is sleeved with the handle 6 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 installation 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.