Mechanical locking hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinder equipment, in particular to a mechanical locking hydraulic cylinder which comprises a cylinder body, a piston rod, a plurality of locking grooves and an oil inlet pipe, oil outlets enabling an oil way to push the piston rod are formed in the ends, close to the locking grooves, of the oil inlet pipe, and sealing plugs used for blocking the oil way are connected to the oil outlets in a sliding mode. The locking structure is used for locking the piston rod when oil is not fed and driving the sealing plug to move when oil is fed; the locking structure comprises a guide groove, a reset spring rod and a locking piece, the guide groove is formed in the oil inlet pipe and right faces the oil outlet, the reset spring rod is fixedly connected to the inner side wall of the guide groove, and the locking piece is fixedly connected to the end of the reset spring rod and used for being clamped into the locking groove. And the piston rod is automatically locked without oil pressure, and is unlocked and driven during oil feeding, so that the safety and the reliability are ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydraulic cylinder equipment, and discloses a mechanical locking hydraulic cylinder. BACKGROUND

[0002] Traditional hydraulic cylinder locking technology mainly relies on hydraulic valve components (such as hydraulic locks and balance valves) to close oil paths to achieve position keeping, but has the following defects:

[0003] Leakage risk: the valve components are prone to internal leakage after long-term use, which causes the oil pressure to gradually decrease, and long-term position locking cannot be achieved.

[0004] Stuck hidden danger: valve sticking may cause sudden falling of heavy objects and other safety accidents, and the reliability is insufficient.

[0005] Temperature sensitivity: the closed oil is subject to thermal expansion and cold contraction due to environmental temperature changes, causing micro-displacement of the piston rod and precision decrease.

[0006] Although the existing mechanical locking scheme can solve the above problems, it still has limitations:

[0007] Complex structure: special unlocking oil paths and additional parts (such as locking sleeves and unlocking oil pipes) need to be added, which increases manufacturing cost and maintenance difficulty.

[0008] Space occupation: the locking structure occupies the internal space of the piston rod, affects the installation of the built-in sensor, and limits the application of modification.

[0009] One-way locking defect: some locking mechanisms (such as brake pad type and clamping ring type) can only lock in a specific direction or terminal position, and are prone to failure or wear the surface of the piston rod when locked in both directions.

[0010] Insufficient bearing capacity: steel ball friction type and roller type locking rely on contact friction force, and are prone to cause cylinder deformation or unlocking difficulty under high load. In view of the above problems, the present application provides a mechanical locking hydraulic cylinder to solve the above problems.

[0011] The utility model aims at providing a mechanical locking hydraulic cylinder, through the linkage design of mechanical locking structure and hydraulic drive, the piston rod is automatically locked when there is no oil pressure, and the piston rod is unlocked and driven when oil is fed, so that safety and reliability are ensured.

[0012] In order to achieve the above object, the utility model discloses a basic scheme of mechanical locking hydraulic cylinder, including hollow cylinder body and a section of piston rod in the cylinder body, and a section of piston rod is equipped with a plurality of locking grooves in the circumferential direction, the cylinder body is equipped with a plurality of oil inlet pipes corresponding with the number of locking grooves in the circumferential direction, the oil inlet pipe is equipped with the oil outlet that makes the oil way push the piston rod in the end close to the locking groove, the oil outlet is slidably connected with the sealing plug for plugging the oil way, and further include locking structure when not oil, the locking piston rod is driven and moves the sealing plug, the locking structure includes the guide groove that is equipped with on the oil inlet pipe and is opposite with the oil outlet, the reset spring rod that is fixedly connected to the inner wall of guide groove and the locking piece that is fixedly connected to the end of reset spring rod for the locking groove of inserting, the sealing plug is fixedly connected on the connecting rod, and the sealing plug is slidably connected with the oil outlet.

[0013] Further, the locking piece includes the pressing ball fixedly connected to the end of reset spring rod, the connecting rod fixedly connected to the other end of pressing ball and the locking ball arranged on the connecting rod for inserting the locking groove, the sealing plug is fixedly connected on the connecting rod, and the sealing plug is slidably connected with the oil outlet.

[0014] Further, the reset spring rod includes the sliding sleeve, the telescopic rod slidably connected with the sliding sleeve and the reset spring connected with the inner wall of sliding sleeve and the end of telescopic rod respectively.

[0015] Further, the cylinder body is equipped with the hydraulic oil passage communicated with the oil outlet, and the hydraulic oil passage is used for the flow of hydraulic oil and drives the piston rod.

[0016] Further, the volume of the pressing ball is greater than the volume of the locking ball.

[0017] The principle and effect of the basic scheme are as follows:

[0018] 1, double locking mechanism:

[0019] The reset spring rod is matched with the locking groove, automatic locking is realized when there is no oil pressure, and the locking response is rapid when oil is fed and the hydraulic oil pushes the sealing plug to drive the locking piece to separate.

[0020] 2, symmetrical stress and low wear:

[0021] The locking structure is distributed in the circumferential direction of the cylinder body, and the lateral pressure is evenly shared, so that local wear is avoided.

[0022] The locking ball and the locking groove adopt spherical surface contact design, reduce sliding friction, and avoid furrow effect damage to the cylinder wall.

[0023] 3, energy saving and structure simplification:

[0024] No special unlocking oil way is needed, and the hydraulic pressure of the driving oil way is directly used for unlocking, so that the energy consumption and system complexity are reduced.

[0025] 4. Reset spring rod integrated guide groove and sealing plug, compact structure, suitable for retrofitting scenarios, can directly replace ordinary hydraulic cylinders. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0027] Figure 1 The overall schematic diagram of a mechanical locking hydraulic cylinder according to an embodiment of the present application is shown.

[0028] Figure 2 The schematic diagram of the oil inlet pipe of a mechanical locking hydraulic cylinder according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the present application will be described in detail below with reference to the drawings and preferred embodiments.

[0030] The reference signs in the drawings of the specification include: piston rod 1, cylinder body 2, oil inlet pipe 3, oil outlet 4, sealing plug 5, lower pressing ball 6, telescopic rod 7, locking ball 8, connecting rod 9, reset spring 10, sliding sleeve 11.

[0031] A mechanical locking hydraulic cylinder, as shown in the embodiments of the present application Figure 1 , Figure 2 , includes a hollow cylinder body 2 and a piston rod 1 located inside the cylinder body 2 and extending out of the cylinder body 2, the piston rod 1 located inside the cylinder body 2 has two groups of locking grooves arranged circumferentially, the cylinder body 2 has two groups of oil inlet pipes 3 connected circumferentially and corresponding to the number of locking grooves, the oil inlet pipes 3 have oil outlets 4 at one end near the locking grooves, the oil outlets 4 are provided with sealing plugs 5 for plugging the oil path, and the sealing plugs 5 are in sliding connection with the oil outlets 4.

[0032] Further comprising a locking structure for locking the piston rod 1 when no oil is fed and moving the sealing plug 5 when oil is fed, the locking structure includes a guide groove integrally formed at the end of the oil inlet pipe 3 and opposite to the oil outlet 4, a reset spring 10 rod fixedly installed on the inner wall of the guide groove away from the locking groove, and a locking piece fixedly installed at the end of the reset spring 10 rod for being clamped into the locking groove. The reset spring 10 rod includes a sliding sleeve 11 fixed on the inner wall of the oil inlet pipe 3, a telescopic rod 7 installed in the sliding sleeve 11 and capable of sliding, and a reset spring 10 connected to the inner wall of the sliding sleeve 11 and the end of the telescopic rod 7 at both ends.

[0033] The locking member comprises a pressing ball 6 fixedly installed at the top end of the reset spring 10, a connecting rod 9 fixedly installed at the other end of the pressing ball 6, and a locking ball 8 fixedly installed on the connecting rod 9 for being inserted into the locking groove, the volume of the pressing ball 6 is larger than that of the locking ball 8, a sealing plug 5 is fixedly installed on the connecting rod 9, the sealing plug 5 is in sliding connection with the oil outlet 4, and a hydraulic oil passage is arranged in the cylinder body 2 and is in communication with the oil outlet 4, the hydraulic oil passage is used for hydraulic oil flow and driving the piston rod 1.

[0034] The utility model uses the following process:

[0035] When no oil is added: the reset spring 10 pushes the locking ball 8 to be clamped into the locking groove, and the piston rod 1 is mechanically locked;

[0036] When oil is added: the hydraulic oil enters the oil inlet pipe 3 through the hydraulic oil passage, pushes the sealing plug 5 and the locking member to slide, so that the reset spring 10 is retracted at the same time, the locking ball 8 is separated from the locking groove, the sealing plug 5 opens the oil outlet 4, and the piston rod 1 can move freely.

[0037] The utility model has the following advantages:

[0038] Mechanical locking is safe and reliable: through the cooperation of the reset spring 10 rod and the locking groove, the position of the piston rod 1 is automatically locked when there is no oil pressure, and accidental movement is avoided;

[0039] Energy saving and high efficiency: only short-time oil supply is needed to unlock and drive the piston rod 1, and continuous pressure maintaining is not needed;

[0040] Compact structure: the locking structure and the hydraulic oil passage are integrated and designed, the overall layout is simplified, and the manufacturing cost is reduced.

[0041] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above, it is not intended to limit the utility model. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the utility model technical scheme, and any equivalent embodiment with equivalent changes and modifications is still within the scope of the utility model technical scheme.

Claims

1. A mechanically locked hydraulic cylinder, characterized in that, The application relates to a hollow cylinder and a piston rod located in the cylinder, wherein the piston rod is located in the cylinder and is provided with a plurality of locking grooves in a circumferential direction, the cylinder is provided with a plurality of oil inlet pipes corresponding to the number of the locking grooves in the circumferential direction, the oil inlet pipes are provided with oil outlets for pushing the piston rod at one end close to the locking grooves, the oil outlets are slidably connected with sealing plugs for blocking the oil paths, the locking structure is used for locking the piston rod when no oil is fed and moving the sealing plugs when oil is fed, the locking structure comprises guiding grooves arranged on the oil inlet pipes and opposite to the oil outlets, reset spring rods fixed to the inner walls of the guiding grooves and locking members fixed to the end portions of the reset spring rods and used for being clamped into the locking grooves.

2. A mechanically locked hydraulic cylinder according to claim 1, characterized in that The locking member comprises a pressing ball fixed to the end portion of the reset spring rod, a connecting rod fixed to the other end of the pressing ball and a locking ball arranged on the connecting rod and used for being inserted into the locking groove, the sealing plug is fixed to the connecting rod, and the sealing plug is slidably connected with the oil outlet.

3. A mechanically locked hydraulic cylinder according to claim 2, characterized in that The reset spring rod comprises a sliding sleeve, a telescopic rod slidably connected with the sliding sleeve and reset springs connected with the inner wall of the sliding sleeve and the end portion of the telescopic rod respectively.

4. A mechanically locked hydraulic cylinder according to claim 1, characterized in that The cylinder is provided with a hydraulic oil channel communicated with the oil outlet, and the hydraulic oil channel is used for flowing and driving the piston rod.

5. A mechanically locked hydraulic cylinder as claimed in claim 2, wherein, The volume of the pressing ball is larger than that of the locking ball.

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