Hydraulic cylinder with clamping structure

Abstract

The utility model discloses a hydraulic cylinder with a clamping structure, and relates to the technical field of hydraulic cylinders, in particular to the hydraulic cylinder with the clamping structure, which comprises a piston rod, a piston and a cylinder body, the piston is arranged in the cylinder body in a sliding manner, and one end of the piston rod is fixedly mounted with the piston; the hydraulic cylinder with the clamping structure further comprises a cylinder head and a one-way hydraulic lock. Through cooperative arrangement of the piston rod, the piston, the cylinder body, the cylinder head and the one-way hydraulic lock, the hydraulic cylinder with the clamping structure has the effects of locking the piston rod in a one-way mode and preventing the piston rod from shrinking, oil flows into the rodless cavity through the one-way hydraulic lock and pushes the piston rod to stretch out, and the rodless cavity is reversely compressed by resistance after the piston rod stretches out. When the piston rod is locked, oil in the rodless cavity is blocked by the one-way hydraulic lock and cannot flow back, so that the oil in the rodless cavity cannot overflow, the piston rod is locked, and the piston rod has reliable clamping force in the locked state.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field, concretely is a hydraulic cylinder with clamping structure. BACKGROUND

[0002] The locking oil cylinder currently used generally adopts the structure of hydraulic locking, that is, a hydraulic lock is arranged at the oil inlet to prevent the backflow of oil to achieve the purpose of locking the piston rod, but the hydraulic element inevitably has a small amount of leakage after a long working time, which makes it difficult to achieve accurate locking, especially in some heavy-duty working conditions, which has a safety hazard.

[0003] In the disclosed Chinese patent application with publication number CN202811639U and patent name "Locking oil cylinder with arbitrary displacement", the prior art comprises a cylinder body, a piston rod, a piston, a guide sleeve, a rodless cavity oil port and a rod cavity oil port, characterized in that a locking cylinder and an end cover are fixed to the front end of the cylinder body, the front end of the piston rod passes through the end cover, a contactable float, a tapered wedge sleeve and a compression spring are arranged in sequence on the piston rod in the locking cylinder, an oil port is arranged on the locking cylinder behind the float, the front end of the compression spring is in contact with the end cover, an exhaust hole is arranged on the locking cylinder in front of the tapered wedge sleeve, and more than two fan-shaped bearing shells are arranged between the tapered wedge sleeve and the piston rod. Although the prior art can lock the piston rod at any stroke position, the prior art has certain limitations in specific implementation. In the specific implementation, the related structure of the prior art for locking the piston rod is relatively complicated, which increases the manufacturing cost.

[0004] In the disclosed Chinese patent application with publication number CN215521469U and patent name "Supporting oil cylinder with hydraulic lock", the prior art sets up a moving assembly, which can fix the position of the hydraulic lock by rotating the screw rod to make the two fixed plates respectively adhere to the outer surfaces of the first protective cover and the second protective cover during use. The prior art has certain limitations in specific implementation. In the specific implementation process, the hydraulic lock is arranged on the outer wall of the oil cylinder, and the hydraulic lock constitutes a protruding structure on the outer wall of the oil cylinder, which is not only not beautiful but also not convenient for installing the oil cylinder on the corresponding auxiliary equipment. UTILITY MODEL CONTENTS

[0005] (1) Technical problem solved

[0006] In view of the deficiencies of the prior art, the utility model provides a hydraulic cylinder with clamping structure, which solves the problems raised in the above background technology.

[0007] (2) Technical scheme

[0008] In order to achieve the above object, the utility model discloses a hydraulic cylinder with clamping structure, including piston rod, piston, cylinder body, the piston is slidably arranged in the inside of cylinder body, one end of piston rod is fixedly installed with piston, a hydraulic cylinder with clamping structure still includes cylinder head, one-way hydraulic lock, one end of cylinder body is fixedly installed with end cover guide sleeve, the middle part of piston rod penetrates end cover guide sleeve and both slide connections, the piston divides the cylinder body into the rod cavity and the rod cavity without rod in the inside, the cylinder head is fixedly installed on the one end lateral wall of cylinder body away from end cover guide sleeve, one-way hydraulic lock is arranged in the cylinder head, and the oil flow end of one-way hydraulic lock is communicated with the rod cavity without rod in the inside of cylinder body, and oil flows into the rod cavity without rod after one-way hydraulic lock and can not flow reversely, the inside fixed mounting of cylinder head has two-way hydraulic lock, the outer lateral wall of one end of piston rod away from piston is fixedly installed with first clamp, and the outer lateral wall of cylinder head is fixedly installed with second clamp.

[0009] Optionally, the cylinder body is composed of a cylinder body portion and a base portion, and the cylinder body portion is welded to the base portion at an end away from the end cover guide sleeve.

[0010] Optionally, a first oil flow channel is formed in the lateral wall of the cylinder body, one end of the first oil flow channel is communicated with the rod cavity in the cylinder body, a second oil flow channel is formed in the cylinder head, the first oil flow channel is communicated with the second oil flow channel, and the internal flow channel of the two-way hydraulic lock is communicated with the second oil flow channel.

[0011] Optionally, one end of the piston rod penetrates the middle part of the piston, and a third O-shaped sealing ring and a fourth O-shaped sealing ring are respectively arranged on the end head of the piston rod and the abutting surface of the piston, and the end head of the piston rod and the piston are fixedly installed on the abutting surface at the penetration position by a plurality of first screws.

[0012] Optionally, a fifth O-shaped sealing ring is embedded on the outer circumferential wall surface of the piston.

[0013] Optionally, a plurality of second screws are threadedly connected to the end cover guide sleeve and penetrate the end cover guide sleeve, and the end cover guide sleeve is fixedly installed on the cylinder body by the second screws, and a dustproof ring and a shaft sealing ring are respectively embedded on the inner ring lateral wall surface of the end cover guide sleeve.

[0014] (Three) beneficial effects

[0015] The utility model provides a hydraulic cylinder with clamping structure has the following beneficial effects:

[0016] 1. The hydraulic cylinder with clamping structure, through the cooperation of the piston rod, the piston, the cylinder body, the cylinder head and the one-way hydraulic lock, the hydraulic cylinder with clamping structure has the effects of locking the piston rod in one direction and preventing the piston rod from retracting, the oil flows into the rodless cavity through the one-way hydraulic lock, the oil pushes the piston rod to extend, and the piston rod is reversely compressed by resistance after extending, the oil in the rodless cavity is blocked by the one-way hydraulic lock and cannot flow back, thereby ensuring that the oil in the rodless cavity cannot overflow, the piston rod is locked, and the piston rod has reliable clamping force in the locked state. Compared with the prior art, the structure is simple, and the manufacturing cost is low.

[0017] 2. The hydraulic cylinder with clamping structure, through the cooperation of the piston rod, the piston, the cylinder body, the cylinder head, the one-way hydraulic lock and the two-way hydraulic lock, the hydraulic cylinder with clamping structure has the effects of locking the piston rod in two directions and preventing the piston rod from extending or retracting, the oil flowing into the rodless cavity cannot flow back under the blockage of the one-way hydraulic lock, the oil flowing into the rod cavity through the first oil flow channel and the second oil flow channel cannot flow back under the blockage of the two-way hydraulic lock, and the oil in the rodless cavity and the rod cavity is saturated and blocked and cannot overflow, so that the piston is fixed at a certain position in the cylinder body and cannot be displaced, thereby achieving two-way locking and fixing of the piston rod, and the piston rod cannot extend or retract in the cylinder body. Compared with the prior art, the structure is simple, the manufacturing cost is low, and the stability is high.

[0018] 3. The one-way hydraulic lock and the two-way hydraulic lock are arranged in the cylinder head, the cylinder head protects the one-way hydraulic lock and the two-way hydraulic lock, the cylinder head is fixedly installed at one end of the cylinder body, the cylinder head and the cylinder body form an integrated structure, the whole is beautiful, and the cylinder head is convenient to install on other equipment.

[0019] 4. The first clamp is arranged on the piston rod, the second clamp is arranged on the cylinder head, the piston rod drives the first clamp to displace when extending or retracting, the first clamp can clamp and fix an object when moving close to the second clamp, and the first clamp can release the object when moving away from the second clamp. The two-way locking of the piston rod in the cylinder body can not only ensure the stable clamping of the object, but also avoid damaging the object due to excessive clamping force of the first clamp driven by the piston rod. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Figure 1The utility model discloses a front view structural schematic drawing of hydraulic cylinder with clamping structure,

[0022] Figure 2 The utility model discloses a cross section structural schematic drawing of hydraulic cylinder with clamping structure,

[0023] Figure 3 The utility model discloses a right view structural schematic drawing of hydraulic cylinder with clamping structure,

[0024] Figure 4 The utility model discloses a left view structural schematic drawing of hydraulic cylinder with clamping structure,

[0025] Figure 5 The utility model discloses a front view structural schematic drawing of hydraulic cylinder with clamping structure (the light black number character in the drawing is size mark),

[0026] Figure 6 The utility model discloses a cross section structural schematic drawing of hydraulic cylinder with clamping structure (the light black number character in the drawing is size mark),

[0027] Figure 7 The utility model discloses a right view structural schematic drawing of hydraulic cylinder with clamping structure (the light black number character in the drawing is size mark),

[0028] Figure 8 The utility model discloses a left view structural schematic drawing of hydraulic cylinder with clamping structure (the light black number character in the drawing is size mark).

[0029] In the drawing: 1, cylinder body;2, piston;3, end cover guide sleeve;4, piston rod;5, one-way hydraulic lock;9, dustproof ring;11, shaft seal ring;15, third O-shaped seal ring;16, fourth O-shaped seal ring;18, fifth O-shaped seal ring;21, first screw;22, second screw;24, cylinder head;25, rodless cavity. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model will be described below in connection with the drawings. In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation on the utility model. In addition, the terms "first", "second", "third" are only for the description purpose, and cannot be understood as the indication or implication.

[0031] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.It is obvious that the described embodiment is only a part of the embodiment of the utility model, not all the embodiment.

[0032] Embodiment one, please refer to Figures 1 to 8 The utility model provides technical scheme: a hydraulic cylinder with clamping structure, including piston rod 4, piston 2, cylinder body 1, piston 2 is arranged in the inside of cylinder body 1 and slides, one end of piston rod 4 is fixedly installed with piston 2, a hydraulic cylinder with clamping structure still includes cylinder head 24, one-way hydraulic lock 5.

[0033] One end of cylinder body 1 is fixedly installed with end cover guide sleeve 3, the middle part of piston rod 4 penetrates end cover guide sleeve 3 and both slide connections, and piston 2 divides the inside of cylinder body 1 into rod cavity and rodless cavity 25.Cylinder head 24 is fixedly installed on the side wall of one end of cylinder body 1 away from end cover guide sleeve 3, one-way hydraulic lock 5 is arranged in cylinder head 24, and the oil liquid outflow end of one-way hydraulic lock 5 is communicated with the rodless cavity 25 in cylinder body 1, and the oil liquid flows into the rodless cavity 25 through one-way hydraulic lock 5 and cannot flow reversely.

[0034] Wherein, cylinder head 24 is fixedly installed with oil pipe, and one end of oil pipe is communicated with the inflow end of one-way hydraulic lock 5.The oil liquid flows into the rodless cavity 25 of cylinder body 1 through oil pipe and one-way hydraulic lock 5, and the cavity space of rodless cavity 25 becomes larger after the oil liquid increases, and the oil liquid pushes piston 2 to slide displacement, and piston 2 drives piston rod 4 to move, and piston rod 4 extends out of cylinder body 1.Piston rod 4 extends out of cylinder body 1 and is resisted by external force, and piston rod 4 applies reverse thrust to the oil liquid in rodless cavity 25, and the oil liquid in rodless cavity 25 flows reversely after being subjected to reverse thrust, and due to the existence of one-way hydraulic lock 5, one-way hydraulic lock 5 blocks the oil liquid, so that the oil liquid cannot flow reversely, so that piston rod 4 cannot contract, that is, one-way locking of piston rod 4 is realized.

[0035] Specifically, cylinder body 1 is composed of a cylinder portion and a base portion, and the end of the cylinder portion away from the end cover guide sleeve 3 is welded with the base portion.

[0036] Wherein, the connection mode between the end of the cylinder portion away from the end cover guide sleeve 3 and the base portion can also adopt other fixed installation modes.Cylinder body 1 is composed of a cylinder portion and a base portion, which can greatly facilitate the installation of piston 2 and piston rod 4.

[0037] Specifically, one end of the piston rod 4 penetrates the middle of the piston 2, and the end of the piston rod 4 and the abutting surface of the piston 2 are respectively provided with a third O-shaped sealing ring 15 and a fourth O-shaped sealing ring 16, and the end of the piston rod 4 and the abutting surface of the piston 2 at the penetration are fixedly installed by a plurality of first screws 21. The fifth O-shaped sealing ring 18 is embedded on the outer circumferential wall surface of the piston 2.

[0038] The third O-shaped sealing ring 15 and the fourth O-shaped sealing ring 16 are both used for sealing to prevent the oil in the rodless cavity 25 or the rod cavity from seeping into the rod cavity or the rodless cavity 25. The fifth O-shaped sealing ring 18 is used for sealing the outer circumferential wall surface of the piston 2. Each first screw 21 is used to fixedly install the piston rod 4 and the piston 2.

[0039] Specifically, the end cover guide sleeve 3 is threadedly connected with a plurality of second screws 22 penetrating the end cover guide sleeve 3, and the end cover guide sleeve 3 is fixedly installed with the cylinder body 1 by each second screw 22. The dustproof ring 9 and the shaft sealing ring 11 are respectively embedded on the inner ring side wall surface of the end cover guide sleeve 3.

[0040] Each second screw 22 is used to fixedly install the end cover guide sleeve 3 and the cylinder body 1. The dustproof ring 9 is used for dust prevention to avoid dust entering the cylinder body 1. The shaft sealing ring 11 plays a sealing role.

[0041] Embodiment two, please refer to Figures 1 to 8 The difference between the present embodiment and embodiment one mainly lies in that the bidirectional hydraulic lock is fixedly installed in the inside of the cylinder head 24.

[0042] The first oil flow channel is opened in the side wall of the cylinder body 1, one end of the first oil flow channel communicates with the rod cavity in the cylinder body 1, the second oil flow channel is opened in the cylinder head 24, the first oil flow channel communicates with the second oil flow channel, and the internal flow channel of the bidirectional hydraulic lock communicates with the second oil flow channel.

[0043] The oil flowing into the rodless cavity 25 cannot flow back and overflow under the blocking of the one-way hydraulic lock 5. The oil flowing into the rod cavity through the first oil flow channel and the second oil flow channel cannot flow back and overflow under the blocking of the bidirectional hydraulic lock. In the case that the oil in the rodless cavity 25 and the rod cavity is saturated and blocked and cannot overflow, the piston 2 is fixed at a certain point in the cylinder body 1 and cannot be displaced, thereby realizing the bidirectional locking and fixing of the piston rod 4, and the piston rod 4 cannot be stretched out or contracted in the cylinder body 1. Compared with the prior art, the structure is simple, the manufacturing cost is low, and the stability is high.

[0044] Embodiment three, please refer to Figures 1 to 8The difference between the embodiment and the embodiment one is that a first clamp is fixedly installed on the outer side wall of the end of the piston rod 4 away from the piston 2, and the first clamp is perpendicular to the piston rod 4; and a second clamp is fixedly installed on the outer side wall of the cylinder head 24, and the second clamp is perpendicular to the cylinder head 24.

[0045] The first clamp is arranged on the piston rod 4, the second clamp is arranged on the cylinder head 24, the piston rod 4 drives the first clamp to move when the piston rod 4 is stretched out or retracted, the first clamp can clamp and fix the object when the first clamp moves close to the second clamp, and the first clamp can release the object when the first clamp moves away from the second clamp. The bidirectional locking of the piston rod 4 in the cylinder body 1 can ensure the stable clamping of the object and avoid the damage of the object caused by the excessive clamping force of the first clamp driven by the piston rod 4.

[0046] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application.

Claims

1. A hydraulic cylinder with clamping structure, comprising a piston rod (4), a piston (2), a cylinder body (1), the piston (2) is slidingly arranged inside the cylinder body (1), one end of the piston rod (4) is fixedly installed with the piston (2), characterized in that: Also include cylinder head (24), one-way hydraulic lock (5); One end of the cylinder (1) is fixedly installed with end cover guide sleeve (3), the middle part of the piston rod (4) penetrates the end cover guide sleeve (3) and the both are slidingly connected, the piston (2) divides the cylinder (1) into rod cavity and rod cavity (25); The cylinder head (24) is fixedly installed on the side wall of the cylinder (1) away from the end cover guide sleeve (3), the one-way hydraulic lock (5) is arranged in the cylinder head (24), the oil liquid outflow end of the one-way hydraulic lock (5) is communicated with the rod cavity (25) in the cylinder (1), and the oil liquid flows into the rod cavity (25) through the one-way hydraulic lock (5) and cannot flow reversely; The inside of the cylinder head (24) is fixedly installed with a bidirectional hydraulic lock; The outer side wall of the piston rod (4) away from the piston (2) is fixedly installed with a first clamp, and the outer side wall of the cylinder head (24) is fixedly installed with a second clamp.

2. The hydraulic cylinder with integrated clamping structure of claim 1, wherein: The cylinder (1) is composed of a cylinder body and a base, and the end of the cylinder body away from the end cover guide sleeve (3) is welded with the base.

3. The hydraulic cylinder with integrated clamp according to claim 1, characterized in that: A first oil flow channel is formed in the side wall of the cylinder (1), one end of the first oil flow channel is communicated with the rod cavity in the cylinder (1), a second oil flow channel is formed in the cylinder head (24), the first oil flow channel is communicated with the second oil flow channel, and the internal flow channel of the bidirectional hydraulic lock is communicated with the second oil flow channel.

4. The hydraulic cylinder with integrated clamp of claim 1, wherein: One end of the piston rod (4) penetrates the middle part of the piston (2), and the end of the piston rod (4) and the abutting surface of the piston (2) are respectively provided with third O-shaped sealing ring (15) and fourth O-shaped sealing ring (16), and the end of the piston rod (4) and the abutting surface of the piston (2) are fixedly installed by a plurality of first screws (21) at the penetrating position.

5. The hydraulic cylinder with integrated clamp according to claim 4, characterized in that: The fifth O-shaped sealing ring (18) is embedded on the outer circumferential wall surface of the piston (2).

6. The hydraulic cylinder with integrated clamp of claim 1, wherein: A plurality of second screws (22) are threadedly connected to the end cover guide sleeve (3) and penetrate the end cover guide sleeve (3), and the end cover guide sleeve (3) is fixedly installed with the cylinder (1) through the second screws (22); The inner ring side wall surface of the end cover guide sleeve (3) is embeddedly provided with dustproof ring (9) and shaft sealing ring (11) respectively.

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