Self-locking hydraulic cylinder

Abstract

The utility model discloses a self-locking hydraulic cylinder, comprising a hydraulic cylinder barrel, the outer surface of which is provided with a first oil inlet hole and a second oil inlet hole, the first oil inlet hole is arranged on the outer surface of the lower end of the hydraulic cylinder barrel, and the second oil inlet hole is arranged on the outer surface of the upper end of the hydraulic cylinder barrel, the inner surface of the hydraulic cylinder barrel is slidably connected with a piston rod, the outer surface of the piston rod is provided with a piston block, the tail end of the piston rod is provided with a tail end convex node, the inner surface of the hydraulic cylinder barrel is provided with a positioning groove, the outer surface of the tail end convex node of the piston rod is clamped into the inner surface of the positioning groove, and the inner surface of the tail end convex node is provided with a positioning slide groove, and a clamping structure is arranged in the tail end convex node, which can be stably clamped and fixed in the positioning groove, and the clamping is stable and cannot be pulled out and slipped off by itself. After the hydraulic oil is introduced, the hydraulic oil is introduced into the clamping groove and the clamping block is pressed and pushed open to unlock the lock. The mechanism is simple and the buckling is firm.

Description

Technical Field

[0001] The utility model relates to the field of a self-locking hydraulic cylinder, and more specifically to a self-locking hydraulic cylinder. Background Art

[0002] As an actuator in the hydraulic system, the hydraulic cylinder needs to stay at any position and bear the load force. In order to improve the accuracy and endurance of the actuator's working position, this paper designs a retracted self-locking hydraulic cylinder, which can achieve the purpose of locking through its own mechanical structure;

[0003] In the traditional technology, the invention patent with the authorization announcement number CN101852225B discloses a retracted self-locking hydraulic cylinder, which is provided with a hydraulic cylinder barrel, a front cover, a rear cover, a locking pin, a piston with a rod, a locking piston and a locking piston spring. The hydraulic cylinder barrel is provided with a central through hole, and the central through hole forms a step at the rear end of the hydraulic cylinder barrel, and the barrel wall is provided with oil inlet and outlet holes; the front and rear end covers are detachably connected to the hydraulic cylinder barrel; the piston with a rod is provided in the hydraulic cylinder barrel, the axis of the piston with a rod coincides with the axis of the hydraulic cylinder barrel, the rod end of the piston with a rod is exposed from the front cover, and the piston end of the piston with a rod is provided with a radial through hole and an axial hole; the locking piston and the locking piston spring are provided in the axial hole of the piston with a rod, the locking piston spring is sleeved on the outer surface of the locking piston, the end of the locking piston is fixedly connected to the axial hole, and the axis of the locking piston coincides with the axis of the axial hole; the locking pin is provided in the radial through hole of the piston with a rod, and the locking pin slides with the surface of the through hole and can move along the surface of the locking piston;

[0004] According to the prior art, such as application publication number CN116044861A, the present invention discloses a retracted self-locking hydraulic cylinder, which specifically relates to the technical field of self-locking hydraulic cylinders, including a hydraulic cylinder barrel, a front end cover, a rear end cover, a locking pin, a piston with a rod, a locking piston and a locking piston spring. The hydraulic cylinder barrel is provided with a stepped central through hole, and is provided with an oil inlet hole and an oil outlet hole. When the retracted self-locking hydraulic cylinder designed by the present invention is unlocked, the tapered design of the radial tapered hole can enable the hydraulic oil to slowly enter between the locking piston and the inner wall of the piston end, so that during the unlocking process, the pressure inside the stepped hole between the piston end and the inner wall of the hydraulic cylinder barrel is greater than the pressure between the locking piston and the inner wall of the piston end, which helps the pressure spring to be more easily fully retracted, ensuring that the locking pin is fully retracted in advance and in close contact with the surface of the locking piston, and can prevent the hydraulic oil from entering between the locking pin and the locking piston, affecting the precise positioning of the rod piston; when the locked hydraulic cylinder is unlocked, the pressure oil can easily enter between the locking piston and the locking pin. When the locking piston moves a certain distance, the locking pin, under the action of the pressure oil, overcomes the friction force and retracts inwardly and contacts the surface of the locking piston. At this time, there will still be pressure oil between the locking piston and the locking pin, so the locking pin and the locking piston cannot be in close contact, affecting their precise positioning;

[0005] In the above-mentioned prior art, the snap-in structure is snap-in inside the spring-back support cavity, and the snap-in structure has poor stability and can easily slip off, and the mechanism is unstable and complicated. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a self-locking hydraulic cylinder. When in use, a clamping structure is set in the convex section of the tail end, which can be stably clamped and fixed in the positioning groove, and the clamping is stable and cannot be pulled out and slipped by itself. After the hydraulic oil is introduced into the clamping groove, the hydraulic oil is reversely squeezed to push open the clamping block to unlock it. The structure is simple and the buckling is firm.

[0007] To solve the above problems, the utility model adopts the following technical solutions.

[0008] A self-locking hydraulic cylinder comprises a hydraulic cylinder barrel, wherein the outer surface of the hydraulic cylinder barrel is provided with a first oil inlet hole and a second oil inlet hole, the first oil inlet hole is provided on the outer surface of the lower end of the hydraulic cylinder barrel, the second oil inlet hole is provided on the outer surface of the upper end of the hydraulic cylinder barrel, the inner surface of the hydraulic cylinder barrel is slidably connected with a piston rod, the outer surface of the piston rod is provided with a piston block, the tail end of the piston rod is provided with a tail end convex node, the inner surface of the hydraulic cylinder barrel is provided with a positioning groove, the outer surface of the tail end convex node of the piston rod is stuck in the inner surface of the positioning groove, the tail end convex node The inner surface of the joint is provided with a positioning groove, and the inner surface of the positioning groove is slidably connected with a spring and a buckle block. The inner surface of the hydraulic cylinder barrel is provided with a positioning groove, and the buckle block is snapped into the positioning groove. The inner surface of the positioning groove of the hydraulic cylinder barrel is provided with the inner surface of the oil inlet hole. A snap-fit ​​structure is provided in the convex joint at the tail end, which can be stably snapped and fixed in the positioning groove, and the snap-fit ​​is stable and cannot be pulled out and slipped off by itself. After the hydraulic oil is introduced, the hydraulic oil is introduced into the slot to reversely squeeze and push open the buckle block to unlock it. The structure is simple and the buckle is firm.

[0009] Furthermore, the oil inlet hole is provided on the inner surface of the bottom of the cylinder barrel of the hydraulic cylinder, and the oil inlet hole and the positioning slot are interconnected.

[0010] Furthermore, the oil inlet hole adopts a flared hole structure, and its outer end radius is arranged with an inclined expansion structure.

[0011] Furthermore, a buffer groove is provided on the inner surface of the bottom positioning groove of the hydraulic cylinder barrel.

[0012] Furthermore, the outer surface of the piston rod is provided with a piston block, and the outer surface of the piston block is closely fitted to the inner surface of the cylinder barrel of the hydraulic cylinder.

[0013] Furthermore, the inner surface of the tail end convex section is provided with three groups of positioning grooves, and the three groups of buckle blocks are distributed on the inner surface of the tail end convex section.

[0014] Furthermore, the outer end surface of the buckle block is provided with a rounded corner.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) A snap-fit ​​structure is provided in the convex section at the tail end, so that the locking structure can be stably locked in the positioning groove and fixed, and the locking structure is stable and cannot be pulled out and slipped off by itself. After the hydraulic oil is introduced, the hydraulic oil is introduced into the groove to reversely squeeze and push open the snap-fit ​​block to unlock it. The structure is simple and the snap-fit ​​is firm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0019] Figure 3 This is a piston rod view of the utility model;

[0020] Figure 4 It is a cross-sectional view of the piston rod of the utility model.

[0021] Description of the numbers in the figure: Oil inlet hole

[0022] 1 hydraulic cylinder barrel, 2 first oil inlet hole, 3 second oil inlet hole, 4 piston rod, 5 piston block, 6 tail end convex joint, 7 positioning slide groove, 8 spring, 9 buckle card block, 10 positioning card groove, 11 oil inlet hole, 12 buffer groove, 90 chamfered corner. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] See also Figure 1-4A self-locking hydraulic cylinder comprises a hydraulic cylinder barrel 1, the outer surface of the hydraulic cylinder barrel 1 is provided with a first oil inlet hole 2 and a second oil inlet hole 3, the first oil inlet hole 2 is provided on the outer surface of the lower end of the hydraulic cylinder barrel 1, the second oil inlet hole 3 is provided on the outer surface of the upper end of the hydraulic cylinder barrel 1, the inner surface of the hydraulic cylinder barrel 1 is slidably connected with a piston rod 4, the outer surface of the piston rod 4 is provided with a piston block 5, the tail end of the piston rod 4 is provided with a tail end convex node 6, the inner surface of the hydraulic cylinder barrel 1 is provided with a positioning groove, the outer surface of the tail end convex node 6 of the piston rod 4 is stuck in the inner surface of the positioning groove, and the inner surface of the tail end convex node 6 The side surface is provided with a positioning slot 7, and the inner surface of the positioning slot 7 is slidably connected with a spring 8 and a buckle block 9, and the inner surface of the hydraulic cylinder barrel 1 is provided with a positioning slot 10, and the buckle block 9 is snapped into the positioning slot 10. The inner surface of the positioning slot 10 of the hydraulic cylinder barrel 1 is provided with the inner surface of the oil inlet hole 11. The clamping structure is provided in the tail end convex section, which can be stably clamped and fixed in the positioning slot, and the clamping is stable and cannot be pulled out and slipped off by itself. After the hydraulic oil is introduced, the hydraulic oil is introduced into the slot to reversely squeeze and push open the buckle block to unlock it. The mechanism is simple and the buckling is firm.

[0026] The oil inlet hole 11 is provided on the inner surface of the bottom of the hydraulic cylinder barrel 1, and the oil inlet hole 11 and the positioning slot 10 are interconnected to facilitate the introduction of hydraulic oil;

[0027] The oil inlet hole 11 adopts an expanded hole structure, and its outer end radius is inclined and expanded to facilitate the introduction of hydraulic oil into the oil inlet hole 11. The expanded hole structure design facilitates the entry of hydraulic oil;

[0028] A buffer groove 12 is provided on the inner surface of the bottom positioning groove of the cylinder barrel 1 of the hydraulic cylinder. When the tail end convex section 6 is retracted, it can be inserted into the positioning groove, and the buffer groove 12 can be compressed to provide buffering oil.

[0029] The outer surface of the piston rod 4 is provided with a piston block 5, and the outer surface thereof is closely attached to the inner surface of the cylinder barrel 1 of the hydraulic cylinder;

[0030] The inner surface of the tail end convex section 6 is provided with three groups of positioning slots 7, and the three groups of buckle blocks 9 are distributed and arranged on the inner surface of the tail end convex section 6. The three groups of buckle blocks are designed to ensure stable positioning.

[0031] The outer end surface of the buckle block 9 is provided with a rounded corner 90, and when buckling, the rounded corner 90 can facilitate the buckling;

[0032] When it is used, the piston rod 4 is slidably connected to the inner surface of the hydraulic cylinder barrel 1, the outer surface of the piston rod 4 is provided with a piston block 5, the tail end of the piston rod 4 is provided with a tail end convex node 6, the inner surface of the hydraulic cylinder barrel 1 is provided with a positioning groove, the outer surface of the tail end convex node 6 of the piston rod 4 is inserted into the inner surface of the positioning groove, the inner surface of the tail end convex node 6 is provided with a positioning slide groove 7, the inner surface of the positioning slide groove 7 is slidably connected with a spring 8 and a buckle block 9, the inner surface of the hydraulic cylinder barrel 1 is provided with a positioning groove 10, the buckle block 9 It can be automatically locked by being inserted into the positioning slot 10 for positioning. The inner surface of the positioning slot 10 of the hydraulic cylinder barrel 1 is provided with an inner surface of an oil inlet hole 11. The oil inlet hole 11 is opened on the inner surface of the bottom of the hydraulic cylinder barrel 1, and the oil inlet hole 11 and the positioning slot 10 are interconnected to facilitate the introduction of hydraulic oil. When the hydraulic oil is introduced for pushing, the hydraulic oil can enter from the oil inlet hole 11 to squeeze the buckle block 9 to shrink, and the buckle block 9 can be popped open. At this time, the locking structure can be unlocked, the buckle is stable, and it is easy to use. The structure is simple and the cost is low.

[0033] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A self-locking hydraulic cylinder, comprising a hydraulic cylinder barrel (1), characterized in that: The outer surface of the hydraulic cylinder barrel (1) is provided with a first oil inlet hole (2) and a second oil inlet hole (3), the first oil inlet hole (2) is provided on the outer surface of the lower end of the hydraulic cylinder barrel (1), and the second oil inlet hole (3) is provided on the outer surface of the upper end of the hydraulic cylinder barrel (1), the inner surface of the hydraulic cylinder barrel (1) is slidably connected with a piston rod (4), the outer surface of the piston rod (4) is provided with a piston block (5), the tail end of the piston rod (4) is provided with a tail end convex node (6), and the inner surface of the hydraulic cylinder barrel (1) is provided with A positioning groove, the outer surface of the rear end convex node (6) of the piston rod (4) is inserted into the inner surface of the positioning groove, the inner surface of the rear end convex node (6) is provided with a positioning slide groove (7), the inner surface of the positioning slide groove (7) is slidably connected with a spring (8) and a snap-on block (9), the inner surface of the hydraulic cylinder barrel (1) is provided with a positioning groove (10), the snap-on block (9) is inserted into the positioning groove (10), and the inner surface of the positioning groove (10) of the hydraulic cylinder barrel (1) is provided with the inner surface of the oil inlet hole (11).

2. The self-locking hydraulic cylinder according to claim 1, characterized in that: The oil inlet hole (11) is provided on the inner surface of the bottom of the hydraulic cylinder barrel (1), and the oil inlet hole (11) and the positioning slot (10) are in communication with each other.

3. The self-locking hydraulic cylinder according to claim 2, characterized in that: The oil inlet hole (11) adopts a flared hole structure, and its outer end radius is arranged in an inclined expansion structure.

4. The self-locking hydraulic cylinder according to claim 1, characterized in that: A buffer groove (12) is provided on the inner surface of the bottom positioning groove of the hydraulic cylinder barrel (1).

5. The self-locking hydraulic cylinder according to claim 1, characterized in that: The outer surface of the piston rod (4) is provided with a piston block (5), and the outer surface thereof is closely fitted to the inner surface of the hydraulic cylinder barrel (1).

6. The self-locking hydraulic cylinder according to claim 1, characterized in that: The inner surface of the tail end convex section (6) is provided with three groups of positioning slide grooves (7), and the three groups of buckling blocks (9) are distributed and arranged on the inner surface of the tail end convex section (6).

7. The self-locking hydraulic cylinder according to claim 1, characterized in that: The outer end surface of the buckle block (9) is provided with a rounded corner (90).

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