Locking oil cylinder

Abstract

The utility model discloses a locking oil cylinder which comprises a cylinder barrel provided with a first oil port and a second oil port. The piston is arranged in the cylinder barrel; the piston rod is fixedly connected with the piston; the guide sleeve is fixedly connected to the end of the cylinder barrel, a positioning piece is arranged on the guide sleeve and comprises a positioning pin and a spring, and a gap is formed between the positioning pin and the outer wall of the piston rod; the piston rod is sleeved with the positioning sleeve, the positioning sleeve is provided with a guide inclined face and a first groove matched with the positioning piece, and when the piston rod stretches out, the positioning pin is clamped into the first groove in the positioning sleeve to lock the piston rod. The piston rod is locked by arranging the groove and the positioning pin on the positioning sleeve, so that the structure is simple; meanwhile, a third step part is arranged on the guide sleeve, so that a gap is formed between the end part of the positioning pin and the outer wall of the piston rod, and abrasion of the piston rod caused by contact between the positioning pin and the piston rod is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic oil cylinder technical field, concretely relates to a locking oil cylinder. BACKGROUND

[0002] Hydraulic oil cylinder is the hydraulic execution element that reciprocating motion of piston rod is pushed through the thrust of hydraulic oil, has extensive application in mechanical transmission field. In the working state, according to different application scene, need to make piston rod extend and retract, and after piston rod extends, need to work stably at the current position, that is, want to lock the piston rod.

[0003] The prior art generally detects by setting sensor and reversing valve and other external components outside the cylinder body to realize locking, realizes locking by intermittent oil supply to the oil cylinder by detecting the displacement of the piston in the oil cylinder, and the use of external components leads to complex structure and high cost. Therefore, some researches set positioning blocks or locking blocks on the cylinder body to lock the piston rod through the structure of the oil cylinder itself, but the positioning blocks or locking blocks directly contact the piston rod, which can cause cylinder barrel wear and positioning block deformation.

[0004] Therefore, how to solve the technical problem of locking the piston rod during the operation of the oil cylinder by a locking device is an urgent problem for those skilled in the art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a locking oil cylinder, which can lock the piston rod after the piston rod extends during the operation of the hydraulic oil cylinder.

[0006] The technical scheme of the utility model is as follows, a locking oil cylinder, comprising:

[0007] Cylinder barrel, the first oil port, the second oil port are set up on the cylinder barrel;

[0008] Piston and piston rod fixedly connected with the piston are arranged in the cylinder barrel;

[0009] Guide sleeve, fixedly connected at the end of the cylinder, the guide sleeve is provided with a positioning piece, and the positioning piece has a gap with the outer wall of the piston rod;

[0010] Positioning sleeve, the positioning sleeve is provided with a guide inclined surface and a first groove matched with the positioning piece.

[0011] Further, the positioning piece includes a spring and a positioning pin, the positioning pin includes a first step portion, and the spring is sleeved on one end of the positioning pin and abuts against the first step portion.

[0012] Further, the positioning pin comprises a second step portion, the guide sleeve is provided with a third step portion, the second step portion and the third step portion are in abutment, so that the end of the positioning pin has a gap with the outer wall of the piston rod.

[0013] Further, the first groove is annularly arranged on the outer circumferential surface of the positioning sleeve, so that the positioning pin can be clamped into the first groove when the piston rod moves axially.

[0014] Further, the end of the positioning pin is a smooth circular arc structure.

[0015] Further, the positioning pin is annularly provided with a second groove, and a sealing ring is arranged in the second groove.

[0016] Further, the guide sleeve and the piston rod are provided with a sealing assembly.

[0017] Further, the utility model further comprises a gland, the gland is detachably arranged on the guide sleeve and abuts against one end of the spring.

[0018] Further, the piston rod is provided with a fourth step portion, and the positioning sleeve is arranged on the piston rod between the fourth step portion and the piston.

[0019] Further, the guide slope is a smooth slope.

[0020] Based on the above technical scheme, the utility model can realize the following technical effects:

[0021] 1. The locking oil cylinder of the utility model is characterized in that a positioning sleeve with a groove is arranged on the piston rod, the positioning sleeve is arranged on the piston rod between the fourth step portion of the piston rod and the piston, and a spring and a positioning pin are arranged on the guide sleeve, so that the positioning pin is clamped into the first groove of the positioning sleeve after the piston rod is extended, and the piston is locked.

[0022] 2. The locking oil cylinder of the utility model is characterized in that a third step portion is arranged on the guide sleeve, the second step portion of the positioning pin and the third step portion of the guide sleeve are in abutment, so that the end of the positioning pin has a gap with the outer wall of the piston rod, and the contact between the positioning pin and the piston rod is avoided to prevent the piston rod from being abraded.

[0023] 3. The locking oil cylinder of the utility model is characterized in that when the piston rod needs to be retracted after being locked in the case of oil cut-off, hydraulic oil is only needed to be introduced through the second oil port, a pressure difference is generated between the two cavities of the positioning pin due to the sealing effect of the sealing ring, the hydraulic oil lifts the positioning pin, and the locking is released, so that the piston rod is retracted. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1The utility model discloses a locking oil cylinder initial state structure schematic diagram.

[0025] Figure 2 The utility model discloses a locking oil cylinder locking state structure schematic diagram.

[0026] Figure 3 It is positioning sleeve structure schematic diagram.

[0027] Figure 4 It is positioning pin structure schematic diagram.

[0028] Figure 5 It is the sectional view of guide sleeve.

[0029] In the drawing: 1-cylinder barrel;2-piston;3-piston rod;4-guide sleeve;5-positioning sleeve;51-guide inclined surface;52-first recess;6-positioning pin;61-first step portion;62-second step portion;63-second recess;7-spring;8-pressing cover;9-third step portion;10-fourth step portion;11-sealing ring;12-first oil port;13-second oil port. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0031] It is noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0032] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically indicated. Meanwhile, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings once an item is defined in one drawing.

[0033] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0034] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0035] As shown in Figures 1-5 The present embodiment provides a locking oil cylinder, which comprises a cylinder barrel 1, a piston 2, a piston rod 3 and a guide sleeve 4. The piston 2 is arranged in the cylinder barrel 1, and the piston 2 is fixedly connected to one side of the piston rod 3, so that the piston 2 and the piston rod 3 can move axially along the inner cavity of the cylinder barrel 1. The guide sleeve 4 is fixedly connected to the end of the cylinder barrel 1, and the guide sleeve 4 is provided with a positioning piece. There is a gap between the positioning piece and the outer wall of the piston rod 3, which avoids the wear of the piston rod 3 caused by the contact between the positioning piece and the piston rod 3.

[0036] As shown in Figures 1-3 The locking oil cylinder further comprises a positioning sleeve 5, which is sleeved on the piston rod 3 and provided with a guide inclined surface 51 and a first groove 52 matched with the positioning piece on the positioning sleeve 5. The first groove 52 is used for accommodating the end of the positioning piece.

[0037] As shown in Figure 1 andFigure 2 As shown, the cylinder 1 is provided with a first oil port 12 and a second oil port 13. The first oil port 12 is the oil inlet, through which hydraulic oil is introduced, causing the piston rod 3 to extend. The second oil port 13 is the oil return port, through which hydraulic oil is introduced when the piston rod 3 needs to be retracted.

[0038] As a preferred technical solution in this embodiment, such as Figures 1-4 As shown, the positioning component includes a spring 7 and a positioning pin 6. Wherein, as... Figure 4 As shown, the end of the positioning pin 6 has a smooth, arc-shaped structure, and a second groove 63 is annularly provided on the positioning pin 6, with a sealing ring 11 disposed within the second groove. The positioning pin 6 includes a first stepped portion 61, and a spring is sleeved on one end of the positioning pin 6 and abuts against the first stepped portion 61. The positioning pin 6 also includes a second stepped portion, and a third stepped portion 9 is provided on the guide sleeve 4. The second stepped portion 62 and the third stepped portion 9 abut against each other to create a gap between the end of the positioning pin 6 and the outer wall of the piston rod 3, preventing wear of the piston rod 3 due to contact between the positioning pin and the piston rod 3.

[0039] The locking cylinder also includes a pressure cap 8 that is detachably mounted on the guide sleeve 4 and abuts against one end of the spring 7 to prevent the positioning element from coming out.

[0040] As a preferred technical solution in this embodiment, a sealing assembly is provided between the guide sleeve 4 and the piston rod 3.

[0041] As a preferred technical solution in this example, the piston rod 3 is provided with a fourth step portion 10, and the positioning sleeve 5 is sleeved on the piston rod 3 between the fourth step portion 10 and the piston 2, so that the position between the positioning sleeve 5 and the piston rod 3 remains fixed and there is no relative displacement.

[0042] As a preferred technical solution in this embodiment, the positioning sleeve 5 is provided with a smooth guide slope 51 and a first groove 52 arranged in a ring on the outer peripheral surface of the positioning sleeve 5, so that when the piston rod 3 moves axially, the positioning pin 6 can be engaged into the first groove 52 to lock the piston.

[0043] The working process of this utility model: Initially, as follows: Figure 1 As shown, the piston rod 3 is in the fully retracted state. Hydraulic oil is introduced through the first oil port 12, and after the hydraulic oil is input, the piston rod 3 extends. During the gradual extension of the piston rod 3, since the end of the locating pin 6 and the guide slope 51 of the locating sleeve 5 are both smooth, when the end of the locating sleeve 5 away from the piston 2 touches the lower end of the locating pin 6, it will push the locating pin 6 up. When the locating pin 6 moves to the position of the first groove 52, due to the presence of the spring 7, the locating pin 6 will be engaged in the first groove 52 of the locating sleeve 5. At this time, the piston rod 3 will not be forcibly retracted by external force, thus completing the locking of the hydraulic cylinder.

[0044] When the locking oil cylinder needs to retract the piston rod 3, hydraulic oil is introduced into the second oil port 13, and due to the sealing effect of the sealing ring 11, the hydraulic oil cannot enter the cavity between the gland 8 and the first step portion 61, so that the pressure difference is generated in the cavities at both ends of the positioning pin 6, the pressure of the hydraulic oil lifts the positioning pin 6, the positioning pin 6 is separated from the first groove 52 of the positioning sleeve 5, and thus is unlocked, at this time, the piston rod 3 can be normally moved, and the retraction effect is realized.

[0045] In summary, the locking oil cylinder of the utility model, by installing the positioning sleeve 5 with the first groove 52 on the piston rod 3, after the piston rod 3 is stretched out, the positioning pin 6 is clamped into the first groove 51 of the positioning sleeve 5, and the piston is locked. In addition, by arranging the third step portion 9 on the guide sleeve 4, the second step portion 62 on the positioning pin 6 and the third step portion 9 on the guide sleeve 4 are abutted, so that the lower end of the positioning pin 6 has a gap with the outer wall of the piston rod 3, and the wear of the piston rod 3 caused by the contact between the positioning pin 6 and the piston rod 3 is avoided.

[0046] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A locking ram, characterized in that, The utility model relates to a piston rod positioning device of a cylinder, including: The cylinder (1) is provided with first oil port (12), second oil port (13); Piston (2) and piston rod (3) fixedly connected with piston (2) are arranged in the cylinder (1); Guide sleeve (4) is fixedly connected at the end of cylinder (1), guide sleeve (4) is provided with positioning piece, and positioning piece has clearance with the outer wall of piston rod (3); Positioning sleeve (5) is sleeved on piston rod (3), and positioning sleeve (5) is provided with guide inclined plane (51) and first recess (52) matched with positioning piece.

2. A locking ram as claimed in claim 1, wherein The positioning piece includes spring (7) and positioning pin (6), the positioning pin (6) includes first step portion (61), the spring is sleeved on one end of the positioning pin (6) and abuts against the first step portion (61).

3. A locking ram as claimed in claim 2, wherein The positioning pin includes second step portion (62), the guide sleeve (4) is provided with third step portion (9), the second step portion (62) and the third step portion (9) abut, so that the end of the positioning pin (6) has clearance with the outer wall of the piston rod (3).

4. A locking ram as defined in claim 2 wherein, The first recess (52) is annularly arranged on the outer circumferential surface of the positioning sleeve (5), so that the positioning pin (6) can be clamped into the first recess (52) when the piston rod (3) moves axially.

5. The locking ram as defined in claim 2 wherein, The end of the positioning pin (6) is a smooth circular arc structure.

6. A locking ram as defined in claim 2 wherein, The positioning pin (6) is annularly provided with a second recess (63), and a sealing ring (11) is arranged in the second recess.

7. The locking ram as defined in claim 1, wherein A sealing assembly is arranged between the guide sleeve (4) and the piston rod (3).

8. The locking ram as defined in claim 2 wherein, Further comprising gland (8), the gland (8) can be detachably arranged on the guide sleeve (4) and abut against one end of the spring (7).

9. The locking ram as defined in claim 1, wherein, The piston rod (3) is provided with a fourth step portion (10), and the positioning sleeve (5) is sleeved on the piston rod (3) between the fourth step portion (10) and the piston (2).

10. The locking ram as defined in claim 1, wherein, The guide inclined plane (51) is a smooth inclined plane.

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