CN218760699U - Bidirectional self-locking support leg hydraulic cylinder - Google Patents

Abstract

The utility model discloses a two-way auto-lock landing leg hydraulic cylinder relates to hydraulic cylinder technical field, the hydraulic cylinder comprises a cylinder body, the one end of cylinder body is equipped with the integrated end cover of oil circuit, the other end of cylinder body can be dismantled and is connected with and lead the lid main part, the inside slidable mounting who leads the lid main part has the piston rod main part, it leads lid guide ring and piston rod seal to install on the inner wall of lid main part, lead lid guide ring and piston rod seal all with the laminating of piston rod main part surface, the piston rod main part extends to the inside one end of cylinder body and installs the piston main part, it is sealed to be provided with the piston in the piston main part, the inside of the integrated end cover of oil circuit is equipped with the oil circuit piece. The utility model discloses in, simple structure to the dependable performance sparingly welds the material, and reduce cost possesses the function of the two-way interlocking of hydro-cylinder, and structure and material optimization have improved the resistance unbalance loading ability and the stability of landing leg hydro-cylinder.

Description

Bidirectional self-locking support leg hydraulic cylinder

Technical Field

The utility model relates to a hydraulic cylinder technical field especially relates to a two-way auto-lock landing leg hydraulic cylinder.

Background

In recent years, with the rapid development of economic construction, hydraulic cylinders with high standard, high performance and high safety performance are increasingly required in engineering machinery, production equipment and automobile industries. In order to ensure the safety and performance of the oil cylinder, the oil cylinder is necessarily optimized and controlled in the aspects of oil cylinder structure design, material selection, manufacturing process and the like, particularly in the fields of mobile cranes or overhead working trucks and the like, reliable supporting leg oil cylinders are required to be used for providing the maximum possible stability for the working trucks, the supporting leg oil cylinders in the current market are complex in structure design, extra oil ways and valves are required to be added to meet the use requirements, and the oil cylinders with high manufacturing cost and unreliable performance cannot meet the market requirements.

The hydraulic oil cylinder in the prior art mainly has the following problems:

firstly, most oil cylinders in the market do not have a self-locking function, are arranged and added in a hydraulic system, additionally added elements and connecting pipelines are added, the cost is increased, and the risk of loosening leakage or accidental burst is increased by the added connecting pipelines.

The second and partial oil cylinders with one-way locks usually can only self-lock one end, and additional fittings and valves are needed when the other end reaches the self-locking function

Thirdly, the material of the supporting leg oil cylinder in the current market is 45#, so that the supporting leg oil cylinder can not provide reliable support for an operating vehicle used outdoors, and the stability of the oil cylinder is not high.

Fourthly, when the supporting leg oil cylinder in the current market is designed in a structure, the design of the side load resistance of the oil cylinder is insufficient, reliable support cannot be provided for an outdoor operating vehicle, and the oil cylinder is easy to bend.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects and problems in the prior art, the invention provides the support leg hydraulic oil cylinder with the bidirectional self-locking function, which is simple in structure, reliable in performance, economical and applicable.

In order to solve the technical problem, the utility model provides a pair of two-way auto-lock landing leg hydraulic cylinder, the power distribution cylinder comprises a cylinder body, the one end of cylinder body is equipped with the integrated end cover of oil circuit, the other end of cylinder body can be dismantled to be connected with and lead the lid main part, the inside slidable mounting who leads the lid main part has the piston rod main part, it leads lid guide ring and piston rod seal to install on the inner wall of lid main part, it all laminates with piston rod main part surface to lead lid guide ring and piston rod seal, the piston main part is installed to the one end that the piston rod main part extends to the cylinder body inside, be provided with the piston seal in the piston main part, the inside of the integrated end cover of oil circuit is equipped with the oil circuit piece, install first balanced valve and second balanced valve on the integrated end cover of oil circuit, all be provided with oil inlet and oil-out on first balanced valve and the second balanced valve, install oil pipe on the cylinder body, oil pipe's one end extends to the inside of the integrated end cover of oil circuit and is connected with the oil circuit piece, oil pipe's the other end extends to the inside of cylinder body, simple structure to the dependable performance saves the welding material, reduce cost, carries out the design of two balanced valves, reaches the interlocking function of two-way interlocking, and the landing leg can make the landing leg that stops to the effective stability of the supporting leg that the stability of the supporting in the effective resistance of the safe operation that the hydro-carrying that the hydro-cylinder is not can avoid the hydro-cylinder, and the hydro-cylinder, the effective bending that the stability of the effective work of the hydro-cylinder, has not taking place, has not taken place, has avoided the effective bending of the hydro-cylinder, has not to avoid the hydro-cylinder, has avoided the hydro-cylinder, has not to avoid the hydro-cylinder to avoid the stability of the hydro-cylinder.

Preferably, the oil way integrated end cover is fixedly arranged at one end of the cylinder body, and the oil way integrated end cover is fixedly formed with the cylinder body through welding, so that the installation is more stable, the welding and sealing problems do not exist, and the deformation and the leakage risk caused by instable installation are reduced.

Preferably, a thread is formed at one end port of the oil pipe, the oil pipe is fixed with the cylinder body through the thread, and the oil pipe is more conveniently and quickly mounted in a threaded connection mode.

Preferably, an annular groove is further formed in a port at one end of the oil pipe, and a sealing ring is mounted inside the annular groove, so that a sealing effect is achieved, and leakage of hydraulic oil is prevented.

Preferably, the outer surface of the piston rod main body is provided with a hard chromium coating, so that the piston rod main body has the characteristics of brightness, hardness, discoloration resistance, heat resistance, wear resistance and the like, the friction force between the piston rod main body and the inner wall of the cylinder body in the sliding process is reduced, and the service life of the piston rod main body is prolonged.

Preferably, a thread is formed at one end of the piston rod main body, the piston rod main body is in threaded connection with the piston main body through the thread, and the piston rod main body is more convenient and faster to install in a threaded connection mode.

Preferably, the piston rod main body is a cylinder, and the piston rod main body is made of high-strength alloy steel, so that the yield point of the piston rod main body is enhanced.

Preferably, be equipped with the draining mouth on the integrated end cover of oil circuit, draining mouth and the inside oil circuit intercommunication of oil circuit piece when unexpected shut down appears, when needing to retrieve the hydro-cylinder, can arrange the oil through the draining mouth with oil circuit UNICOM, make its hydro-cylinder retrieve slowly.

Preferably, two guide grooves are symmetrically formed in the piston main body, and a piston guide ring is arranged in each guide groove and plays a role in supporting and guiding, so that the piston main body can slide more stably.

Preferably, one side of the piston main body, which is close to the piston rod main body, is provided with a piston limiting sleeve, and the piston limiting sleeve is sleeved outside the piston rod main body, so that the safety stability and the unbalance loading resistance of the oil cylinder are improved.

Compared with the prior art, the utility model provides a pair of two-way auto-lock landing leg hydraulic cylinder has following beneficial effect:

1. in the utility model, the oil path block is skillfully designed on the oil path integrated end cover, the high-pressure power of the hydraulic system is directly communicated to the main working cavity of the oil cylinder, the potential safety hazard of leakage caused by welding or installing a sealing element is reduced, the oil pipe is welded on the oil path block and connected on the cylinder body, the oil path is smooth, the first balance valve and the second balance valve are connected and interlocked in parallel through the oil path on the oil path integrated end cover, and two manual oil drainage ports are skillfully added at one end, thereby effectively preventing the condition that the oil cylinder can not be recovered under the condition of sudden shutdown in the operation process of the oil cylinder,

2. the utility model discloses in, the design of oil circuit piece carries out the parallelly connected interlocking with two balanced valves, reaches the function of the two-way interlocking of hydro-cylinder, enables the hydro-cylinder and stops in the position that needs to keep motionless, equally when meeting accident, the effectual incident of having avoided.

3. The utility model discloses in, structure and material optimization have improved the resistance unbalance loading ability and the stability of landing leg hydro-cylinder, can effectively avoid producing the incident that the operation car overturned because of the landing leg hydro-cylinder is crooked.

Drawings

FIG. 1 is a schematic structural view of a bidirectional self-locking support leg hydraulic cylinder;

FIG. 2 is a schematic sectional view of a bidirectional self-locking leg hydraulic cylinder;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 2;

fig. 5 is a schematic diagram of a bidirectional self-locking support leg hydraulic cylinder.

The reference numbers in the figures: 1. an oil inlet; 2. an oil outlet; 3. sealing the piston; 4. a first counter-balance valve; 5. a second balancing valve; 6. a piston guide ring; 7. a piston stop collar; 8. an oil drainage port; 9. a guide cover guide ring; 10. the piston rod is sealed; 11. a cylinder body; 12. an oil circuit integration end cover; 13. a guide cover main body; 14. a piston rod body; 15. and (4) an oil pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that if there are the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" etc. referring to the indicated orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplicity of description, and it is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The first embodiment is given by fig. 1 to 4, and a bidirectional self-locking support leg hydraulic cylinder comprises a cylinder body 11, wherein one end of the cylinder body 11 is provided with an oil way integrated end cover 12, the other end of the cylinder body 11 is detachably connected with a guide cover main body 13, a piston rod main body 14 is slidably mounted inside the guide cover main body 13, in order to enable the cylinder to provide reliable support for an outdoor working vehicle and improve the stability of the cylinder, the piston rod main body 14 is a cylinder, the piston rod main body 14 is made of high-strength alloy steel, the yield point of the piston rod main body 14 is enhanced, the yield point of the material reaches 785Mpa, the yield point of a common 45# is only 355Mpa, and the yield point of the material of the piston rod main body 14 plays a critical role in resisting eccentric side load and stabilizing the support leg cylinder.

Install on the inner wall of leading lid main part 13 and lead lid guide ring 9 and piston rod seal 10, lead lid guide ring 9 and piston rod seal 10 and all laminate with piston rod main part 14 surface, piston rod main part 14 extends to the inside one end of cylinder body 11 and installs the piston main part, be provided with piston seal 3 in the piston main part, the inside of oil circuit integrated end cover 12 is equipped with the oil circuit piece, install first balanced valve 4 and second balanced valve 5 on the oil circuit integrated end cover 12, all be provided with oil inlet 1 and oil-out 2 on first balanced valve 4 and the second balanced valve 5, the oil inlet and outlet passes through the oil circuit and connects the guide of two balanced valves in parallel. When the machine is stopped halfway or the system leaks or bursts, the balance valve connected with the oil way in parallel does not detect pressure, the balance valve is locked, the hydraulic oil in the oil cylinder cannot reversely pass through the balance valve, and the oil cylinder is ensured to be in a motion forbidden state.

The oil pipe 15 is installed on the cylinder body 11, one end of the oil pipe 15 extends to the inside of the oil circuit integration end cover 12 and is connected with the oil circuit block, the other end of the oil pipe 15 extends to the inside of the cylinder body 11, the structure is simple, the performance is reliable, welding materials are saved, the cost is reduced, the design of the oil circuit block is adopted, two balance valves are connected in parallel and interlocked, the function of bidirectional interlocking of the oil cylinder is achieved, the oil cylinder can be stopped at a required position and kept still, safety accidents are effectively avoided when accidents happen, the unbalance loading resistance and the stability of the supporting leg oil cylinder are improved through structure and material optimization, and the safety accidents that the operating vehicle overturns due to bending of the supporting leg oil cylinder can be effectively avoided.

Example two

As shown in fig. 1 to 4, in order to enable the cylinder body 11 and the oil-way integrated end cover 12 to form a whole, the oil-way integrated end cover 12 is fixedly installed at one end of the cylinder body 11, and the oil-way integrated end cover 12 is fixedly formed with the cylinder body 11 by welding, so that the installation is more stable, the problem of welding and sealing does not exist, and the risks of deformation and leakage caused by instable installation are reduced.

In order to enable the oil pipe 15 to be quickly connected with the cylinder body 11, a thread is formed at one end port of the oil pipe 15, the oil pipe 15 is fixed with the cylinder body 11 through the thread, the main working high-pressure cavity of the oil way integration end cover 12 is directly connected with the cylinder body 11 through an oil way, and the oil pipe 15 is welded with an oil way block.

In order to prevent the oil circuit from leaking, an annular groove is further formed in one end port of the oil pipe 15, a sealing ring is arranged inside the annular groove, the sealing effect is achieved, and leakage of hydraulic oil is prevented.

EXAMPLE III

Referring to fig. 1 to 4, in order to increase the number of times that the piston rod body 14 slides in the cylinder 11, the outer surface of the piston rod body 14 is provided with a hard chrome plating layer, which has the characteristics of brightness, hardness, discoloration resistance, heat resistance, wear resistance and the like, so that the friction between the piston rod body 14 and the inner wall of the cylinder 11 during the sliding process is reduced, and the service life of the piston rod body 14 is also prolonged.

In order to enable the piston rod main body 14 to be connected with the piston main body more conveniently, one end of the piston rod main body 14 is provided with threads, the piston rod main body 14 is in threaded connection with the piston main body through the threads, and the piston rod main body is more convenient and faster to install in a threaded connection mode.

In order to enable the oil cylinder to provide reliable support for an operating vehicle used outdoors and improve the stability of the oil cylinder, the piston rod main body 14 is a cylinder, the piston rod main body 14 is made of high-strength alloy steel, the yield point of the piston rod main body 14 is enhanced, the yield of the material reaches 785Mpa, the yield of the ordinary No. 45 is only 355Mpa, and the yield point of the material of the piston rod main body 14 can play a key role in resisting eccentric lateral load and stability of the supporting leg oil cylinder according to calculation of a mechanical design manual.

Pk＝σs×A/(ι+8×e/d×secθ)

Pk is critical load force, σ s is piston rod material yield point; a is the sectional area of the piston rod; e is the load eccentricity; d is the piston rod diameter and theta is the deflection.

In order to be able to withdraw the piston rod main body 14 to the inside of cylinder body 11 when the hydro-cylinder breaks down, be equipped with draining port 8 on the integrated end cover 12 of oil circuit, draining port 8 and the inside oil circuit intercommunication of oil circuit piece when unexpected shut down appears, when needing to retrieve the hydro-cylinder, can discharge oil through draining port 8 with oil circuit UNICOM, make its hydro-cylinder retrieve slowly.

In order to improve the sliding stability of the piston main body, two guide grooves are symmetrically formed in the piston main body, and a piston guide ring 6 is arranged in each guide groove and plays a role in supporting and guiding, so that the piston main body slides more stably.

In order to improve the stability of the oil cylinder, a piston limiting sleeve 7 is arranged on one side, close to the piston rod main body 14, of the piston main body, the piston limiting sleeve 7 is sleeved outside the piston rod main body 14, the safety stability and the unbalance loading resistance of the oil cylinder are improved, the guiding length of the oil cylinder is increased by 1 time, and the larger the guiding length of the oil cylinder is, the higher the safety stability and the unbalance loading resistance of the oil cylinder are. H is more than or equal to S/20+ D/2H = the guide length of the oil cylinder; s = stroke of the oil cylinder; d = cylinder diameter.

The working principle is as follows: when hydraulic oil enters from an oil inlet 1 on a first balance valve 4, the hydraulic oil enters into a cylinder body 11 through the first balance valve 4, a piston main body and a piston rod main body 14 extend outwards under the operation of hydraulic pressure, and simultaneously, the hydraulic oil with a piston rod cavity enters into an oil outlet 2 of a second balance valve 5 through an oil pipe 15, and flows back to an oil tank through the oil outlet 2 of the second balance valve 5.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a two-way auto-lock landing leg hydraulic cylinder, includes cylinder body (11), its characterized in that, the one end of cylinder body (11) is equipped with oil circuit integrated end cover (12), the other end of cylinder body (11) can be dismantled and be connected with and lead lid main part (13), the inside slidable mounting of leading lid main part (13) has piston rod main part (14), install on the inner wall of leading lid main part (13) and lead lid guide ring (9) and piston rod seal (10), lead lid guide ring (9) and piston rod seal (10) and all laminate with piston rod main part (14) surface, piston rod main part (14) extend to the inside one end of cylinder body (11) and install the piston main part, be provided with piston seal (3) in the piston main part, the inside of oil circuit integrated end cover (12) is equipped with oil circuit piece, install first balanced valve (4) and second balanced valve (5) on oil circuit integrated end cover (12), all be provided with oil inlet (1) and oil-out (2) on first balanced valve (4) and the second balanced valve (5), install oil pipe (15) on cylinder body (11), the oil pipe (15) extend to the other end of integrated end cover (11) and extend to the inside oil circuit piece of cylinder body (11) and be connected.

2. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 1, wherein the oil passage integrated end cover (12) is fixedly installed at one end of the cylinder body (11), and the oil passage integrated end cover (12) is fixed with the cylinder body (11) through welding.

3. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 2, wherein a port at one end of the oil pipe (15) is provided with a thread, and the oil pipe (15) is fixed with the cylinder body (11) through the thread.

4. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 3, wherein an annular groove is further formed in a port at one end of the oil pipe (15), and a sealing ring is mounted inside the annular groove.

5. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 4, wherein the outer surface of the piston rod main body (14) is provided with a hard chrome plating.

6. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 5, wherein one end of the piston rod main body (14) is provided with a thread, and the piston rod main body (14) is in threaded connection with the piston main body through the thread.

7. The bidirectional self-locking support leg hydraulic cylinder according to claim 6, wherein the piston rod main body (14) is a cylinder, and the piston rod main body (14) is made of high-strength alloy steel.

8. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 7, wherein an oil drain port (8) is formed in the oil passage integration end cover (12), and the oil drain port (8) is communicated with an oil passage in the oil passage block.

9. The bidirectional self-locking support leg hydraulic oil cylinder as claimed in claim 8, wherein the piston body is symmetrically provided with two guide grooves, and a piston guide ring (6) is arranged inside each guide groove.

10. The two-way self-locking support leg hydraulic oil cylinder according to claim 9, wherein a piston limiting sleeve (7) is arranged on one side of the piston main body close to the piston rod main body (14), and the piston limiting sleeve (7) is sleeved outside the piston rod main body (14).

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