Sealed multi-stage hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a sealed multi-stage hydraulic cylinder which comprises a first telescopic pipe, a second telescopic pipe, a bolt, a magnet and an extension part. The top end of the first telescopic pipe extends from the top end of the cylinder barrel of the hydraulic cylinder to the moving direction of a piston rod of the hydraulic cylinder in the height direction of the hydraulic cylinder. The second telescopic pipe is arranged on the inner side of the first telescopic pipe and connected to the end of a piston rod of the hydraulic cylinder in a sleeving mode. The telescopic pipes are connected in a sleeved mode, so that the two telescopic rods respectively protect one piston rod of the hydraulic cylinder, the piston rod of the hydraulic cylinder is protected in a segmented mode, meanwhile, the inner side space of the first telescopic pipe is enlarged through the extending part, the first telescopic pipe is made to avoid a connector of the hydraulic cylinder when stretching out and drawing back, and the hydraulic cylinder is protected. And the two telescopic rods are matched to integrally protect the piston rod of the hydraulic cylinder.

Description

TECHNICAL FIELD

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

[0002] The hydraulic cylinder is an execution element in a hydraulic transmission system, which is an energy conversion device for converting hydraulic energy into mechanical energy.

[0003] The Chinese patent document with the authorized announcement number CN208858683U discloses a sealed dustproof multistage hydraulic cylinder, which can play a good dustproof role on the multistage hydraulic cylinder body assembly through the cooperation of the first dustproof pipe, the second dustproof pipe, the third dustproof pipe and the circular sealing top block in the dustproof structure, thereby prolonging the service life of the multistage hydraulic cylinder body assembly.

[0004] However, in the above-mentioned scheme, long notches are formed on the outer circumferential surfaces of the plurality of dustproof pipes to avoid the obstruction between the plurality of dustproof pipes and the hydraulic cylinder joint during the extension and retraction, but the long notches will make the protection of the dustproof pipe on the rod incomplete, resulting in poor dustproof effect of the dustproof pipe. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problems in the background art and provides a sealed multistage hydraulic cylinder.

[0006] The technical scheme of the utility model: a sealed multistage hydraulic cylinder, comprising a first telescopic pipe, a second telescopic pipe, a bolt, a magnet and an extension part.

[0007] The first telescopic pipe is sleeved outside the cylinder barrel of the hydraulic cylinder and the top end thereof extends along the height direction of the hydraulic cylinder from the top end of the cylinder barrel of the hydraulic cylinder towards the moving direction of the piston rod of the hydraulic cylinder.

[0008] The second telescopic pipe is arranged inside the first telescopic pipe and is sleeved at the end part of the piston rod of the hydraulic cylinder, and the top end of the second telescopic pipe is provided with a throat clamp for fixedly connecting the end part of the second telescopic pipe with the piston rod of the hydraulic cylinder in the use state.

[0009] The bolt is arranged at the bottom end of the first telescopic pipe and located at the side surface of the cylinder barrel of the hydraulic cylinder, and has a nut at the end part.

[0010] The magnet is arranged at the top end of the cylinder barrel of the hydraulic cylinder and located inside the first telescopic pipe, and the top end of the magnet is movably connected with the top end inside the first telescopic pipe.

[0011] The extension part is arranged at the side surface of the first telescopic pipe and located at the side surface of the joint of the hydraulic cylinder.

[0012] Preferably, the first telescopic pipe comprises a first telescopic pipe body and a limiting plate.

[0013] The first telescopic pipe body is sleeved outside the cylinder barrel of the hydraulic cylinder;

[0014] The limiting plate is arranged at the top end of the first telescopic pipe body, and the end face is provided with a through hole smaller than the outer diameter of the cylinder barrel of the hydraulic cylinder.

[0015] Preferably, the bottom end of the first telescopic pipe body is provided with a first connecting ring wrapped outside the cylinder barrel of the hydraulic cylinder, the side face of the first connecting ring is provided with an opening, and the two sides of the first connecting ring are respectively provided with a fixed plate connected with a bolt.

[0016] Preferably, the extension part is wrapped outside the joint of the hydraulic cylinder, and the side face of the limiting plate extends to the top end of the extension part and is connected with the extension part.

[0017] Preferably, the second telescopic pipe comprises a second telescopic pipe body, a second connecting ring, a connecting plate and a third connecting ring.

[0018] The second telescopic pipe body is sleeved outside the piston rod of the hydraulic cylinder;

[0019] The third connecting ring is arranged at the bottom end of the second telescopic pipe body and extends to the inside of the first telescopic pipe body;

[0020] The connecting plate is arranged at one end of the third connecting ring and is movably connected with the limiting plate;

[0021] The second connecting ring is arranged at the other end of the second telescopic pipe body and is wrapped outside the piston rod of the hydraulic cylinder.

[0022] Preferably, the length of the third connecting ring is greater than the thickness of the limiting plate.

[0023] Preferably, the outer diameter of the third connecting ring is smaller than the diameter of the through hole of the limiting plate, and the outer diameters of the connecting plate and the second telescopic pipe body are greater than the diameter of the through hole of the limiting plate.

[0024] Compared with the prior art, the above technical scheme of the utility model has the following beneficial technical effects:

[0025] The utility model discloses a telescopic pipe sleeve connection, and two telescopic rods are used for protecting a piston rod of the hydraulic cylinder respectively, so that the piston rod of the hydraulic cylinder is protected in sections, and the inside space of the first telescopic pipe is increased through the extension part, so that the first telescopic pipe avoids the joint of the hydraulic cylinder when telescoping, and the two telescopic rods are used for protecting the piston rod of the hydraulic cylinder integrally. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a perspective view of an embodiment of the utility model.

[0027] Figure 2 It is a magnet and hydraulic cylinder connecting structure schematic view in an embodiment of the utility model.

[0028] Figure 3 This is a cross-sectional schematic diagram of the telescopic tube connection structure in one embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the second telescopic tube structure in one embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the first telescopic tube structure in one embodiment of the present invention.

[0031] Reference numerals: 1. Hydraulic cylinder; 2. First telescopic tube; 21. First telescopic tube body; 22. First connecting ring; 23. Extension; 24. Limiting plate; 25. Fixing plate; 3. Second telescopic tube; 31. Second telescopic tube body; 32. Second connecting ring; 33. Connecting plate; 34. Third connecting ring; 4. Hose clamp; 5. Bolt; 6. Magnet. Detailed Implementation

[0032] Example 1

[0033] like Figures 1-5 As shown, the present invention proposes a sealed multi-stage hydraulic cylinder, which includes a first telescopic tube 2, a second telescopic tube 3, a bolt 5, a magnet 6, and an extension 23;

[0034] The first telescopic tube 2 is sleeved on the outside of the cylinder of the hydraulic cylinder 1, and its top end extends from the top end of the cylinder of the hydraulic cylinder 1 toward the piston rod of the hydraulic cylinder 1 along the height direction of the hydraulic cylinder 1.

[0035] The second telescopic tube 3 is located inside the first telescopic tube 2 and is sleeved on the piston rod end of the hydraulic cylinder 1. The top end of the second telescopic tube 3 is provided with a hose clamp 4 for tightly and fixedly connecting the end of the second telescopic tube 3 to the piston rod of the hydraulic cylinder 1 in use. The hose clamp 4 can be replaced by a clamp, cable tie or other tightening structure in use.

[0036] Bolt 5 is located at the bottom end of the first telescopic tube 2 and on the side of the cylinder of the hydraulic cylinder 1, and has a nut at its end;

[0037] Magnet 6 is located at the top of the cylinder of hydraulic cylinder 1 and inside the first telescopic tube 2. The top of magnet 6 is movably connected to the top of the inner side of the first telescopic tube 2. Magnet 6 can be installed by adhesive or by slotting it at the edge of the top of the cylinder of hydraulic cylinder 1.

[0038] The extension 23 is provided on the side of the first telescopic tube 2 and is located on the side of the connector of the hydraulic cylinder 1 and is connected to the inside of the first telescopic tube 2, thereby increasing the space inside the first telescopic tube 2.

[0039] In the embodiment, the bolt 5 fixes the first telescopic pipe 2 on the cylinder barrel of the hydraulic cylinder 1 through the cooperation of the nut, the magnet 6 adsorbs and fixes the top end of the first telescopic pipe 2 after compression, and the throat clamp 4 fixes one end of the second telescopic pipe 3 at the end close to the piston rod of the hydraulic cylinder 1, drives the second telescopic pipe 3 to extend and retract through the piston rod, and makes the second telescopic pipe 3 prevent dust on the piston rod.

[0040] Embodiment two

[0041] As shown in Figure 3 and Figure 5 The utility model discloses a sealed multistage hydraulic cylinder, compared with embodiment one, in the embodiment, the first telescopic pipe 2 includes first telescopic pipe body 21 and limit board 24.

[0042] The first telescopic pipe body 21 is made of soft material, is sleeved on the outside of the cylinder barrel of the hydraulic cylinder 1 and extends and retracts along the length direction of the cylinder barrel of the hydraulic cylinder 1.

[0043] The limit board 24 is made of metal material and has adsorption connection characteristics between the magnet 6, is arranged at the top end of the first telescopic pipe body 21 and is provided with through hole smaller than the outer diameter value of the cylinder barrel of the hydraulic cylinder 1 on the end face.

[0044] In an optional embodiment, the bottom end of the first telescopic pipe body 21 is provided with the first connecting ring 22 wrapped on the outside of the cylinder barrel of the hydraulic cylinder 1, the side of the first connecting ring 22 has an opening, and the two sides of the first connecting ring 22 are respectively provided with the fixed plate 25 connected with the bolt 5.

[0045] In the embodiment, the limit board 24 is adsorbed and connected with the magnet 6, so that the first telescopic pipe body 21 is fixed after contraction, the limit board 24 limits the bottom end of the second telescopic pipe 3, and when in use, the limit board 24 is separated from the magnet 6 by the driving of the bottom end of the second telescopic pipe 3, the first telescopic pipe body 21 is extended according to the moving direction of the piston rod, and the first telescopic pipe body 21 prevents dust on the piston rod.

[0046] Embodiment three

[0047] As shown in Figure 3 and Figure 5As shown, the utility model provides a kind of sealed multistage hydraulic cylinder, compared with embodiment two, in the embodiment, extension 23 is wrapped in the joint outside of hydraulic cylinder 1, the side of limit plate 24 extends to the top end of extension 23 and is connected with extension 23 for plugging the end of extension 23 when using, wherein, extension 23 is supported by soft material, and bottom end can extend downwards and plugging (not shown in drawing) at fixed plate 25 when using.

[0048] In the embodiment, the inside space of the first telescopic pipe body 21 is increased by the extension 23, so that the first telescopic pipe body 21 avoids the joint of the hydraulic cylinder 1 when sleeved outside the cylinder barrel of the hydraulic cylinder 1, and the first telescopic pipe body 21 completely wraps the cylinder barrel and the piston rod of the hydraulic cylinder 1 through the extension 23 when in use, avoiding the joint of the hydraulic cylinder 1 from blocking the telescopic use.

[0049] Embodiment four

[0050] As Figures 3-4 shown, the utility model provides a kind of sealed multistage hydraulic cylinder, compared with embodiment one, in the embodiment, second telescopic pipe 3 includes second telescopic pipe body 31 second connecting ring 32, connecting plate 33 and third connecting ring 34;

[0051] The second telescopic pipe body 31 is sleeved outside the piston rod of the hydraulic cylinder 1;The third connecting ring 34 is arranged at the bottom end of the second telescopic pipe body 31 and extends to the inside of the first telescopic pipe body 21;It should be noted that the length value of the third connecting ring 34 is greater than the thickness value of the limit plate 24, for placing the second telescopic pipe body 31 and the connecting plate 33 above and below the limit plate 24 respectively when in use;The connecting plate 33 is arranged at one end of the third connecting ring 34 and is movably connected with the limit plate 24;It should be noted that the outer diameter value of the third connecting ring 34 is less than the hole diameter value of the limit plate 24, and the outer diameter values of the connecting plate 33 and the second telescopic pipe body 31 are both greater than the hole diameter value of the limit plate 24;

[0052] The second connecting ring 32 is arranged at the other end of the second telescopic pipe body 31 and wrapped outside the piston rod of the hydraulic cylinder 1.

[0053] In this embodiment, the second connecting ring 32 is connected with the piston rod through the throat ring 4, so that the piston rod drives the second telescopic pipe body 31 to extend through the second connecting ring 32, dustproof work is performed on the piston rod, and when the piston rod extends for a long time, the second telescopic pipe body 31 drives the connecting plate 33 to move in the first telescopic pipe body 21 through the third connecting ring 34, so that the connecting plate 33 drives the limiting plate 24 to move, the limiting plate 24 is separated from the magnet 6, the first telescopic pipe body 21 extends, and when it is retracted, the piston rod drives the second telescopic pipe body 31 to move towards the upper end surface of the limiting plate 24 through the second connecting ring 32, so that the second telescopic pipe body 31 drives the limiting plate 24 to reset, and after the limiting plate 24 is reset, the second telescopic pipe body 31 resets.

[0054] In summary, in use, the bolt 5 adjusts the spacing between the two fixed plates 25 through the cooperation of the nut, so that the fixed plate 25 drives the opening of the first connecting ring 22 to shrink, the first connecting ring 22 is fixed on the cylinder barrel of the hydraulic cylinder 1, the magnet 6 is adsorbed and connected with the limiting plate 24, the first telescopic pipe body 21 is placed in a compressed state, and the second connecting ring 32 is fixed on the piston rod of the hydraulic cylinder 1 through the throat ring 4, when the piston rod extends, the piston rod drives the second telescopic pipe body 31 to extend through the second connecting ring 32, at the same time, the other end of the second telescopic pipe body 31 is limited by magnetic attraction force through the cooperation of the limiting plate 24, the magnet 6, and the connecting plate 33 and the third connecting ring 34, and when the piston rod extends for a long time, the second telescopic pipe body 31 drives the connecting plate 33 to move in the first telescopic pipe body 21 through the third connecting ring 34, so that the connecting plate 33 drives the limiting plate 24 to move, the limiting plate 24 is separated from the magnet 6, the first telescopic pipe body 21 extends, the first telescopic pipe body 21 and the second telescopic pipe body 31 cooperate to protect the piston rod as a whole, and when it is retracted, the piston rod drives the second telescopic pipe body 31 to move towards the upper end surface of the limiting plate 24 through the second connecting ring 32, so that the second telescopic pipe body 31 moves and retracts, and when it is retracted, the limiting plate 24 drives the first telescopic pipe body 21 to retract, at the same time, the first telescopic pipe body 21 drives the extension 23 to wrap the cylinder barrel of the hydraulic cylinder 1, avoiding the occurrence of obstacles between the joint of the hydraulic cylinder 1 and the first telescopic pipe body 21, at the same time, the limiting plate 24 is adsorbed and connected with the magnet 6 again, the connecting plate 33 is connected with the upper end surface of the cylinder barrel of the hydraulic cylinder 1, so that the second telescopic pipe body 31 retracts and resets, and in use, a telescopic rod smaller than the second telescopic pipe 3 is additionally provided, the limiting plate 24 is installed at the end of the second connecting ring 32, the small-size telescopic pipe is inserted into the second telescopic pipe 3, the small-size telescopic pipe is connected with the 24 on the second telescopic pipe 3, the protection length is extended.

[0055] The embodiment of the utility model is described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. A sealed multi-stage hydraulic cylinder, characterized by, The first telescopic pipe (2), the second telescopic pipe (3), the bolt (5), the magnet (6) and the extension (23) are included. The first telescopic pipe (2) is sleeved outside the cylinder barrel of the hydraulic cylinder (1) and the top end extends along the height direction of the hydraulic cylinder (1) from the cylinder barrel top end of the hydraulic cylinder (1) to the moving direction of the piston rod of the hydraulic cylinder (1). The second telescopic pipe (3) is arranged inside the first telescopic pipe (2) and is sleeved at the piston rod end of the hydraulic cylinder (1), and the top end of the second telescopic pipe (3) is provided with a thimble (4) for fixedly connecting the end of the second telescopic pipe (3) with the piston rod of the hydraulic cylinder (1) in the use state. The bolt (5) is arranged at the bottom end of the first telescopic pipe (2) and is located at the side of the cylinder barrel of the hydraulic cylinder (1), and the end portion is provided with a nut. The magnet (6) is arranged at the top end of the cylinder barrel of the hydraulic cylinder (1) and is located inside the first telescopic pipe (2), and the top end of the magnet (6) is movably connected with the inside top end of the first telescopic pipe (2). The extension (23) is arranged at the side of the first telescopic pipe (2) and is located at the joint side of the hydraulic cylinder (1).

2. A sealed multi-stage hydraulic cylinder according to claim 1, wherein, The first telescopic pipe (2) includes a first telescopic pipe body (21) and a limiting plate (24). The first telescopic pipe body (21) is sleeved outside the cylinder barrel of the hydraulic cylinder (1). The limiting plate (24) is arranged at the top end of the first telescopic pipe body (21), and the end face is provided with a through hole smaller than the outer diameter value of the cylinder barrel of the hydraulic cylinder (1).

3. A sealed multi-stage hydraulic cylinder according to claim 2, wherein, The bottom end of the first telescopic pipe body (21) is provided with a first connecting ring (22) wrapped outside the cylinder barrel of the hydraulic cylinder (1), the side of the first connecting ring (22) has an opening, and the two sides of the first connecting ring (22) are respectively provided with a fixing plate (25) connected with the bolt (5).

4. A sealed multi-stage hydraulic cylinder according to claim 2, wherein, The extension (23) is wrapped outside the joint of the hydraulic cylinder (1), and the side of the limiting plate (24) extends to the top end of the extension (23) and is connected with the extension (23).

5. A sealed multi-stage hydraulic cylinder according to claim 2, wherein, The second telescopic pipe (3) includes a second telescopic pipe body (31), a second connecting ring (32), a connecting plate (33) and a third connecting ring (34). The second telescopic pipe body (31) is sleeved outside the piston rod of the hydraulic cylinder (1). The third connecting ring (34) is arranged at the bottom end of the second telescopic pipe body (31) and extends to the inside of the first telescopic pipe body (21). The connecting plate (33) is arranged at one end of the third connecting ring (34) and is movably connected with the limiting plate (24). The second connecting ring (32) is arranged at the other end of the second telescopic pipe body (31) and is wrapped outside the piston rod of the hydraulic cylinder (1).

6. A sealed multi-stage hydraulic cylinder according to claim 5, wherein, The length value of the third connecting ring (34) is greater than the thickness value of the limiting plate (24).

7. A sealed multi-stage hydraulic cylinder as claimed in claim 5, wherein, The outer diameter value of the third connecting ring (34) is smaller than the diameter value of the through hole of the limiting plate (24), and the outer diameter values of the connecting plate (33) and the second telescopic pipe body (31) are both greater than the diameter value of the through hole of the limiting plate (24).

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