CN217401339U

CN217401339U - Double-sealing sequence valve structure of multi-stage telescopic oil cylinder

Info

Publication number: CN217401339U
Application number: CN202221385513.5U
Authority: CN
Inventors: 徐进太; 孙炜东; 董丽; 孙广新; 于双豪
Original assignee: Dalian Nurmi Hydraulic Parts Co ltd
Current assignee: Dalian Nurmi Hydraulic Parts Co ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-09-09
Anticipated expiration: 2032-06-06

Abstract

The utility model discloses a double-sealing sequence valve structure of a multistage telescopic oil cylinder, which comprises a primary cylinder, a secondary cylinder, a pin shaft, a mandril and a sequence valve group; the primary cylinder comprises a cylinder body, a piston rod, a piston, a guide sleeve, an earring and a sequence valve group; the sequence valve group comprises a valve body, a shaft core, a check ring, a nitrile rubber sealing ring, a polyurethane sealing ring, a valve core, a bracket, a push rod, a spring, a snap ring and an elastic check ring for holes; the push rod in the primary cylinder sequence valve group controls the valve core to open and close to realize the sequential expansion of the two oil cylinders, and the structure is simple and reasonable and easy to process while ensuring the control precision, thereby reducing the production cost; a nitrile rubber sealing ring and a check ring are used in a first clamping groove of the sequence valve group, and a polyurethane sealing ring and a check ring are used in a second clamping groove, so that a double-safety structure for sealing is formed, the valve body is ensured not to leak outside, and the multistage telescopic oil cylinder is ensured to have excellent sealing performance.

Description

Double-sealing sequence valve structure of multi-stage telescopic oil cylinder

Technical Field

The utility model relates to a shrink hydro-cylinder field specifically is a double containment sequence valve structure of multistage flexible hydro-cylinder.

Background

The boom extension and retraction modes of the straight-boom lorry-mounted crane are common as follows: synchronous stretching, sequential stretching and synchronous stretching are adopted, sequential stretching and synchronous stretching are usually adopted on a large-tonnage lorry-mounted crane with more boom sections, the internal structure of the boom can be greatly simplified, and the reliability of the stretching structure is improved. At present, the method for realizing sequential extension and retraction of the boom on the lorry-mounted crane mainly comprises the following steps: each oil cylinder is independently controlled through a multi-connected hydraulic control valve; utilizing the area difference of the serial oil cylinders; and controlling sequential expansion and contraction by mechanical touch. The mechanical touch control sequential telescopic cylinder is a multi-stage binding cylinder structure for realizing sequential telescopic of the arm support.

But the structure of the flexible hydro-cylinder of present mechanical touch control order is comparatively complicated, and the sequence valve part is very strict to the machining precision requirement of valve body in the hydro-cylinder moreover, leads to current flexible hydro-cylinder very expensive, and is very big to the cost burden of enterprise, because only one deck seal structure, leads to having the risk that current flexible hydro-cylinder has hydraulic oil to leak moreover.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a double containment sequence valve structure of multistage flexible hydro-cylinder to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the double-seal sequence valve structure of the multi-stage telescopic oil cylinder comprises a first-stage cylinder and a sequence valve group, wherein the first-stage cylinder comprises a first-stage cylinder hanging table, a cylinder body, a piston rod, a piston, a hydraulic oil connecting steel pipe, a guide sleeve and an ear ring, the first-stage cylinder hanging table and a second-stage cylinder are connected together through a pin shaft, an internal oil way is communicated, the piston rod is axially installed inside the cylinder body, the top end of the piston rod penetrates through the cylinder body, the other end of the piston rod is fixedly connected with the ear ring in a welding mode, the piston rod is connected with the piston in a threaded mode, the guide sleeve is connected with the end of the cylinder body in a threaded mode, and the guide sleeve is sleeved at one end of the piston rod, which is different from the piston;

the sequence valve group comprises a valve body, a shaft core, a retainer ring, a nitrile rubber sealing ring, a polyurethane sealing ring, a valve core, a bracket, a push rod, a spring, a snap ring and an elastic retainer ring for holes;

the cylinder body is fixedly connected with the valve body through a long bolt, the shaft core is axially and slidably mounted in the valve body, the nitrile rubber sealing ring and the check ring are sequentially mounted in a first clamping groove in the inner side of the shaft core in an interference fit manner, the polyurethane sealing ring and the check ring are sequentially mounted in a second clamping groove in an interference fit manner, the shaft core is connected with the valve core through welding, the elastic check ring for holes is axially and fixedly mounted in the valve body, the snap ring is mounted on one side of the elastic check ring for holes, the spring is mounted between the snap ring and the valve core, the valve body is fixedly connected with the bracket through a short bolt, and the push rod is mounted on the inner side of the bracket;

the motion end of the piston of the secondary cylinder is fixedly connected with a mandril through a screw, and the mandril is contacted with the push rod.

As a further aspect of the present invention: the earrings are arranged on the arm support of the crane through a middle hole and a shaft.

As a further aspect of the present invention: the hydraulic oil connecting steel pipe is connected to the first-stage cylinder hanging table and the cylinder body through welding.

As a further aspect of the present invention: the cylinder body is made of 45 seamless steel pipes, and the shaft core is made of 14Cr17Ni2 bar stock.

Compared with the prior art, the beneficial effects of the utility model are that:

1. this practicality is pressed or breaks away from through utilizing the ejector pin to the push rod in the sequence valves to control case opens, closes, and this structure is simple reasonable when having guaranteed control accuracy, easily processing, thereby reduces the manufacturing cost of valve body.

2. The utility model discloses, through install the better butadiene acrylonitrile rubber seal of resilience and retaining ring in proper order in the inboard first draw-in groove of axle center, the second draw-in groove is installed in proper order and is adopted better polyurethane seal of wearability and retaining ring, has formed the sealed dual fail-safe structure of twice from this to having guaranteed that the valve body does not have the external leakage, guaranteed that this multistage flexible hydro-cylinder has had fabulous leakproofness.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic structural view of a primary cylinder portion in the present application;

fig. 3 is a schematic structural diagram of a sequence valve set part in the present application.

Fig. 4 is a schematic diagram of the flow of hydraulic oil in the sequence valve set portion according to the present invention.

Fig. 5 is a partial sectional view in the present application.

In the figure: the device comprises a first-stage cylinder 1, a second-stage cylinder 2, a cylinder body 3, a piston rod 4, a piston 5, a guide sleeve 6, a lug ring 7, a sequence valve bank 8, a valve body 9, a shaft core 10, a retainer ring 11, a nitrile rubber seal ring 12, a polyurethane seal ring 13, a valve core 14, a bracket 15, a push rod 16, a spring 17, a snap ring 18, an elastic retainer ring for 19 holes, a pin shaft 20, an ejector rod 21, a hydraulic oil 22 and a steel pipe 23, wherein the first-stage cylinder is connected with a hanging table.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1-5, the utility model provides a technical scheme, a double containment sequence valve structure of multistage flexible hydro-cylinder, including one-level jar 1, sequence valve group 8, one-level jar 1 includes that one-level jar hangs platform 23, cylinder body 3, piston rod 4, piston 5, hydraulic oil connect steel pipe 22, uide bushing 6 and earrings 7, one-level jar hangs platform 23 and second grade jar 2 and links together and the inside oil circuit communicates with each other through round pin axle 20, piston rod 4 along the axial install in inside the cylinder body 3, and the top of piston rod 4 runs through cylinder body 3, and the piston rod 4 other end is connected through welded mode and earrings 7, and piston rod 4 is connected with piston 5 with the threaded mode, uide bushing 6 with 3 end connection of cylinder body with the threaded mode, and cup joint in piston rod 4 the one end that is different from piston 5.

The sequence valve group 8 comprises a valve body 9, a shaft core 10, a retainer ring 11, a nitrile rubber sealing ring 12, a polyurethane sealing ring 13, a valve core 14, a bracket 15, a push rod 16, a spring 17, a snap ring 18 and a hole elastic retainer ring 19.

The cylinder body 3 is fixedly connected with a valve body 9 through a long bolt, a shaft core 10 is arranged inside the valve body 9 in an axial sliding mode, a nitrile rubber sealing ring 12 and a retainer ring 11 are sequentially arranged in a first clamping groove in the inner side of the shaft core 10 in an interference fit mode, a polyurethane sealing ring 13 and the retainer ring 11 are sequentially arranged in a second clamping groove in the interference fit mode, the shaft core 10 is connected with a valve core 14 through welding, a hole elastic retainer ring 19 is fixedly arranged inside the valve body 9 in the axial direction, a clamping ring 18 is arranged on one side of the hole elastic retainer ring 19, a spring (17) is arranged between the clamping ring 18 and the valve core 14, the valve body 9 is fixedly connected with a bracket 15 through a short bolt, and a push rod 16 is arranged on the inner side of the bracket 15.

The piston moving end of the secondary cylinder 2 is fixedly connected with a mandril 21 through a screw, and the mandril 21 is contacted with the push rod 16.

The earring 7 is mounted on the crane boom through a central hole via a shaft.

The hydraulic oil connecting steel pipe 22 is connected to the primary cylinder hanging table 23 and the cylinder block 3 by welding.

The cylinder 3 is made of 45 seamless steel pipe, and the shaft core 10 is made of 14Cr17Ni2 bar stock.

The utility model discloses a theory of operation is:

when the hydraulic oil valve is used, the push rod 16 is pressed by the push rod 21 fixedly connected with the moving end of the piston of the secondary cylinder 2, and the push rod 16 drives the shaft core 10, so that the conical surface of the valve core 14 is separated from the valve body 9, and a channel of hydraulic oil is opened; when a hydraulic oil channel is opened, the piston 5 is pushed by hydraulic oil to drive the piston rod 4 and the lug ring 7 to move, but the lug ring 7 is arranged at the root (lower) part of the arm support of the crane through a shaft by utilizing a middle hole, so that the whole of the cylinder body 3, the sequence valve group 8 and the secondary cylinder 2 of the primary cylinder 1 moves towards the upper part of the arm support under the action of the hydraulic oil, namely the piston rod 4 of the primary cylinder 1 extends out; when the piston rod 4 of the first-stage cylinder is completely extended out, hydraulic oil enters the first-stage cylinder hanging table 23 through the hydraulic oil connecting steel pipe 22 and then enters the second-stage cylinder 2 to push the piston of the second-stage cylinder, and similarly, because the piston, the piston rod, the earrings and the first-stage cylinder hanging table 23 of the second-stage cylinder are connected together through the pin shaft 20, namely, in a relatively static state in the arm support, the cylinder body part of the second-stage cylinder 2 is moved towards the upper part of the arm support under the action of the hydraulic oil, namely, the piston rod of the second-stage cylinder 2 is extended out. And finally, the sequential telescopic function of the arm support which extends out after the primary cylinder 1 extends out of the secondary cylinder 2 is realized.

Because the nitrile rubber sealing ring 12 and the check ring 11 are sequentially arranged in the first clamping groove on the inner side of the shaft core 10 in an interference fit manner, the polyurethane sealing ring 13 and the check ring 11 are sequentially arranged in the second clamping groove in an interference fit manner, the double-safety structure for two sealing can well ensure that the valve body has no external leakage, and the multistage telescopic oil cylinder has excellent sealing performance.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A double-sealing sequence valve structure of a multi-stage telescopic cylinder comprises: the hydraulic control valve comprises a primary cylinder (1) and a sequence valve group (8), and is characterized in that the primary cylinder (1) comprises a primary cylinder hanging table (23), a cylinder body (3), a piston rod (4), a piston (5), a hydraulic oil connecting steel pipe (22), a guide sleeve (6) and an earring (7), the first-stage cylinder hanging platform (23) and the second-stage cylinder (2) are connected together through a pin shaft (20) and the internal oil passages are communicated, the piston rod (4) is axially arranged in the cylinder body (3), the top end of the piston rod (4) penetrates through the cylinder body (3), the other end of the piston rod (4) is connected with the ear ring (7) in a welding mode, the piston rod (4) is connected with the piston (5) in a threaded manner, and the guide sleeve (6) is connected with the end part of the cylinder body (3) in a threaded manner and is sleeved at one end of the piston rod (4) different from the piston (5);

the sequence valve group (8) comprises a valve body (9), a shaft core (10), a check ring (11), a nitrile rubber sealing ring (12), a polyurethane sealing ring (13), a valve core (14), a bracket (15), a push rod (16), a spring (17), a clamping ring (18) and an elastic check ring (19) for holes;

the cylinder body (3) is fixedly connected with the valve body (9) through a long bolt, the shaft core (10) is arranged inside the valve body (9) along the axial direction in a sliding manner, the nitrile rubber sealing ring (12) and the check ring (11) are sequentially arranged in the first clamping groove on the inner side of the shaft core (10) in an interference fit manner, the polyurethane sealing ring (13) and the check ring (11) are sequentially arranged in a second clamping groove in an interference fit manner, the shaft core (10) is connected with the valve core (14) through welding, the hole elastic check ring (19) is arranged inside the valve body (9) along the axial direction in a fixed manner, the snap ring (18) is arranged on one side of the hole elastic check ring (19), the spring (17) is arranged between the snap ring (18) and the valve core (14), and the valve body (9) is fixedly connected with the bracket (15) through a short bolt, the push rod (16) is arranged on the inner side of the bracket (15);

the piston moving end of the secondary cylinder (2) is fixedly connected with a push rod (21) through a screw, and the push rod (21) is in contact with the push rod (16).

2. The structure of the double sealing sequence valve of the multistage telescopic cylinder as claimed in claim 1, wherein the hole in the middle of the lug ring (7) is mounted on the arm support of the crane through a shaft.

3. The structure of the double sealing sequence valve of the multi-stage telescopic cylinder as claimed in claim 1, wherein the hydraulic oil connecting steel pipe (22) is connected to the primary cylinder hanging table (23) and the cylinder body (3) by welding.

4. The double sealing sequence valve structure of multi-stage telescopic cylinder according to claim 1, wherein the cylinder body (3) is made of 45 seamless steel pipe and the shaft core (10) is made of 14Cr17Ni2 bar.