Hydraulic oil cylinder

Abstract

The utility model relates to the technical field of oil cylinders, in particular to a hydraulic oil cylinder which comprises an oil cylinder body, a piston rod, an adjusting sleeve, a locking nut, an adjusting sleeve and a rod head. Wherein the piston rod is movably mounted in the oil cylinder body; the adjusting sleeve is connected with a piston rod exposed out of the oil cylinder body; the adjusting sleeve and the locking nut are sequentially arranged outside the adjusting sleeve in a sleeving mode and connected with the adjusting sleeve in a threaded mode, and the adjusting sleeve can be pressed by the locking nut and abut against the oil cylinder body. The rod head is connected to the structure, exposed out of the adjusting sleeve, of the piston rod, and a first connecting part is formed on the rod head and used for rotating with a target and being detachably connected with the target. Therefore, according to the plunger type hydraulic oil cylinder with the variable installation distance, the installation distance of the oil cylinder can be adjusted in time after the oil cylinder is installed, the total length of the oil cylinder is kept unchanged after adjustment and when the piston rod completely stretches out, the application range is wider, and practicability is higher.

Description

Technical Field

[0001] This application relates to the technical field of oil cylinders, and in particular to a hydraulic oil cylinder. Background Art

[0002] An oil cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy. An oil cylinder basically mainly consists of a cylinder body and end covers, a piston and a piston rod, and a sealing device. In addition to being used individually, hydraulic cylinders can also be combined in two or more, or combined with other mechanisms to complete special functions. With simple structure, reliable operation, and smooth movement, it is widely used in hydraulic systems of various mechanical equipment.

[0003] Currently, during the use of agricultural and industrial machinery, without changing the overall length after the oil cylinder extends, it is necessary to adjust the installation distance. For example, during the harvesting process of a harvester, according to the different stubble heights of crops, it is necessary to adjust the installation distance of the oil cylinder in a timely manner, so as to change the height of the lowest point of the cutting table. And when the piston rod is fully extended after adjustment, the total length of the oil cylinder needs to remain unchanged. Ordinary hydraulic cylinders cannot meet this requirement, so there is an urgent need to develop a new structure of oil cylinder that can adjust the installation distance of the oil cylinder in a timely manner after installation, and when the piston rod is fully extended after adjustment, the total length of the oil cylinder remains unchanged. Summary of the Utility Model

[0004] The purpose of this application is to provide a hydraulic oil cylinder, which to a certain extent solves the technical problem in the prior art that there is an urgent need to develop a new structure of oil cylinder that can adjust the installation distance of the oil cylinder in a timely manner after installation, and when the piston rod is fully extended after adjustment, the total length of the oil cylinder remains unchanged.

[0005] This application provides a hydraulic oil cylinder, including: an oil cylinder body, a piston rod, an adjusting sleeve, a locking nut, an adjusting sleeve, and a rod head; wherein, the piston rod is movably installed in the oil cylinder body; the adjusting sleeve is connected to the piston rod exposed outside the oil cylinder body;

[0006] The adjusting sleeve and the locking nut are sequentially sleeved outside the adjusting sleeve, and are both threadedly connected to the adjusting sleeve, and the adjusting sleeve can be pressed by the locking nut and abutted against the oil cylinder body;

[0007] The rod head is connected to the structure of the piston rod exposed outside the adjusting sleeve, and the rod head is formed with a first connecting portion for rotatably and detachably connecting to a target.

[0008] In the above technical solution, further, the adjusting sleeve is threadedly connected to the piston rod.

[0009] In any of the above technical solutions, further, the hydraulic cylinder also includes a fixing nut, which is sleeved outside the piston rod and is used to press the adjustment sleeve; the rod head abuts against a side of the fixing nut away from the adjustment sleeve.

[0010] In any of the above technical solutions, further, the rod head is formed with a cavity, and the structure of the piston rod exposed outside the adjustment sleeve extends into the cavity and is threadedly connected to the rod head.

[0011] In any of the above technical solutions, further, the piston rod comprises a main rod and an end rod connected in sequence; wherein the diameter of the end rod is smaller than that of the main rod, so that the end of the main rod forms an annular first right-angle mounting surface;

[0012] The adjusting sleeve is in a cap shape, and the inner wall of the adjusting sleeve is formed with an annular second right-angle mounting surface matching the first right-angle mounting surface; the rod head is connected to the end rod.

[0013] In any of the above technical solutions, further, the cylinder body includes a cylinder body and an end cover; wherein the end cover is sleeved and fixed on one end of the cylinder body along its length direction, and the end cover is formed with an installation cavity and two through holes connected to the installation cavity, and the piston rod extends into the installation cavity through one of the through holes, and the piston rod extends outside the installation cavity through another through hole; the adjustment sleeve abuts against the end of the end cover facing away from the cylinder body.

[0014] In any of the above technical solutions, further, the end cover is connected to the cylinder body by welding or by threads.

[0015] In any of the above technical solutions, further, the hydraulic cylinder also includes a first sealing ring, which is sleeved on the outside of the cylinder body and located inside the end cover.

[0016] In any of the above technical solutions, further, the hydraulic cylinder also includes a second sealing ring, a retaining ring and a guide ring; wherein, the second sealing ring, the retaining ring and the guide ring are all sleeved outside the piston rod, and the second sealing ring, the retaining ring and the guide ring are located between the cylinder body and the adjustment sleeve; the retaining ring rests on the inner wall of the end cover close to the rod head.

[0017] In any of the above technical solutions, further, the first connecting portion is a mounting through hole, and the club head is detachably connected to the corresponding target site through the mounting through hole and the fastening member.

[0018] In any of the above technical solutions, further, the cylinder body is formed with a second connecting portion for rotatably connecting to a target location.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows:

[0020] During the use of the hydraulic cylinder provided in the present application, when increasing the installation distance, first loosen the lock nut, and rotate the adjusting sleeve clockwise. At this time, the adjusting sleeve moves outward relative to the adjusting sleeve. Since the rod head, the adjusting sleeve, and the piston rod are connected and fixed together, they will move outward as a whole, the installation distance of the cylinder increases, and since the piston rod moves outward, the stroke of the cylinder decreases, so as to ensure that the total length of the cylinder remains unchanged after the piston rod fully extends. After the adjustment is completed, lock the lock nut.

[0021] When decreasing the installation distance, first loosen the lock nut, and rotate the adjusting sleeve counterclockwise. At this time, the adjusting sleeve moves inward relative to the adjusting sleeve. Since the rod head, the adjusting sleeve, and the piston rod are connected and fixed together, they will move outward as a whole, the installation distance of the cylinder decreases, and since the piston rod moves inward, the stroke of the cylinder increases, so as to ensure that the total length of the cylinder remains unchanged after the piston rod fully extends.

[0022] It can be seen that the present application designs a plunger type hydraulic cylinder with a variable installation distance, which can adjust the installation distance of the cylinder in a timely manner after the cylinder is installed. After the adjustment, when the piston rod fully extends, the total length of the cylinder remains unchanged, with a wider application range and stronger practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the hydraulic cylinder provided by the embodiment of the present application;

[0025] Figure 2 It is a schematic structural diagram of the hydraulic cylinder during adjustment provided by the embodiment of the present application;

[0026] Figure 3 It is a comparison diagram of the initial state of the hydraulic cylinder provided by the embodiment of the present application and the state after adjusting the installation distance;

[0027] Figure 4 It is a comparison diagram of the hydraulic cylinder provided by the embodiment of the present application when the cylinder rod fully extends based on the initial state and the hydraulic cylinder when the cylinder rod fully extends after adjusting the installation distance.

[0028] Reference Signs:

[0029] 1 - Hydraulic cylinder body, 101 - Cylinder block, 1011 - Second connection part, 102 - End cover, 2 - Piston rod, 21 - Main rod, 22 - End rod, 3 - Adjusting sleeve, 4 - Locking nut, 5 - Adjusting sleeve, 6 - Rod head, 61 - First connection part, 7 - Fixing nut, 8 - First sealing ring, 9 - Second sealing ring, 10 - Retaining ring, 11 - Guide ring. Detailed Embodiments

[0030] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application.

[0031] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0032] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] Next, refer to Figures 1 to 4 Describe the hydraulic cylinder according to some embodiments of the present application.

[0036] See Figures 1 to 4As shown in the figure, an embodiment of the present application provides a hydraulic cylinder, including: a cylinder body 1, a piston rod 2, an adjusting sleeve 3, a locking nut 4, an adjusting sleeve 5, and a rod head 6; wherein, the piston rod 2 is movably installed in the cylinder body 1; the adjusting sleeve 5 is connected to the piston rod 2 exposed outside the cylinder body 1;

[0037] The adjusting sleeve 3 and the locking nut 4 are sequentially sleeved outside the adjusting sleeve 5, and both are threadedly connected to the adjusting sleeve 5, and the adjusting sleeve 3 can be pressed by the locking nut 4, and preferably, the adjusting sleeve 3 is pressed by the locking nut 4 and abuts against the cylinder body 1, which helps to increase the adjustment stroke. Of course, it is not limited to this. There may also be a certain gap between the adjusting sleeve 3 and the cylinder body 1 along the moving direction of the piston rod 2, etc., which is specifically selected according to actual needs;

[0038] The rod head 6 is connected to the structure of the piston rod 2 exposed outside the adjusting sleeve 5, and the rod head 6 is formed with a first connecting portion 61 for rotatably and detachably connecting to the target.

[0039] According to the above-described structure, the adjustment process of the hydraulic cylinder provided by the present application is as follows: When increasing the installation distance, as Figure 2 、 Figure 3 and Figure 4 shown, first loosen the locking nut 4, rotate the adjusting sleeve 3 clockwise. At this time, the adjusting sleeve 5 moves outward relative to the adjusting sleeve 3. Since the rod head 6, the adjusting sleeve 5, and the piston rod 2 are connected and fixed together, they will move outward as a whole. The installation distance of the cylinder increases, and since the piston rod 2 moves outward, the stroke of the cylinder decreases, so as to ensure that the total length of the cylinder remains unchanged after the piston rod 2 is fully extended. After the adjustment is completed, lock the locking nut 4.

[0040] When decreasing the installation distance, as Figure 1 、 Figure 3 and Figure 4 shown, first loosen the locking nut 4, rotate the adjusting sleeve 3 counterclockwise. At this time, the adjusting sleeve 5 moves inward relative to the adjusting sleeve 3. Since the rod head 6, the adjusting sleeve 5, and the piston rod 2 are connected and fixed together, they will move outward as a whole. The installation distance of the cylinder decreases, and since the piston rod 2 moves inward, the stroke of the cylinder increases, so as to ensure that the total length of the cylinder remains unchanged after the piston rod 2 is fully extended.

[0041] It can be seen that the present application designs a plunger-type hydraulic cylinder with a variable installation distance, which can adjust the installation distance of the cylinder in a timely manner after the cylinder is installed. After the adjustment, when the piston rod 2 is fully extended, the total length of the cylinder remains unchanged, and the application range is wider and the practicability is stronger.

[0042] It should be noted that: Figure 3 and Figure 4 In, the meanings of each symbol are as follows:

[0043] L1: represents the reduced length of the hydraulic cylinder’s stroke;

[0044] L2: represents the increase in installation distance;

[0045] L3: represents the stroke of the hydraulic cylinder in the initial state;

[0046] L4: represents the stroke of the hydraulic cylinder after adjusting the installation distance;

[0047] L5: represents the installation distance of the cylinder;

[0048] Ltotal: represents the total length of the hydraulic cylinder when the cylinder rod is fully extended based on state A, i.e. the initial state before adjusting the installation distance, and state B, i.e. the state after adjusting the installation distance.

[0049] In this embodiment, preferably, Figure 1 As shown, the adjusting sleeve 5 is threadedly connected to the piston rod 2 .

[0050] According to the structure described above, it can be seen that the adjustment sleeve 5 and the piston rod 2 are connected in a detachable manner, which is convenient for adjustment and subsequent maintenance.

[0051] It should be noted that the connection method between the adjustment sleeve 5 and the piston rod 2 is not limited to threaded connection, and can also be connected in a non-detachable manner such as welding.

[0052] In this embodiment, preferably, Figure 1 As shown, the hydraulic cylinder further comprises a fixing nut 7 which is sleeved on the outside of the piston rod 2 and is used to press the adjusting sleeve 5 ; the rod head 6 abuts against a side of the fixing nut 7 which is away from the adjusting sleeve 5 .

[0053] According to the structure described above, the fixing nut 7 has the function of locking the adjusting sleeve 5 on the one hand, and preventing the rod head 6 from relatively rotating when the adjusting sleeve 3 rotates on the other hand, causing the orientation of the mounting hole to change.

[0054] In this embodiment, preferably, Figure 1 As shown, the rod head 6 is formed with a cavity, and the structure of the piston rod 2 exposed outside the adjustment sleeve 5 extends into the cavity and is threadedly connected to the rod head 6 .

[0055] According to the structure described above, the end of the piston rod 2 can be installed in the cavity of the rod head 6, so that the piston rod 2 and the rod head 6 are assembled more firmly and stably.

[0056] It should be noted that the structure of the rod head 6 and the matching structure with the cylinder rod are not limited to the above, and can also be designed according to actual needs. For example, the rod head 6 can also be in the shape of a U-shaped ear, or the rod head 6 can be in the shape of a plate or a block and installed on the side of one end of the cylinder rod, etc.

[0057] In this embodiment, preferably, Figure 1 As shown, the piston rod 2 includes a main rod 21 and an end rod 22 connected in sequence; wherein the diameter of the end rod 22 is smaller than that of the main rod 21, so that the end of the main rod 21 forms a first annular right-angle mounting surface;

[0058] The adjusting sleeve 3 is in a cap shape, and the inner wall of the adjusting sleeve 3 is formed with an annular second right-angle mounting surface matching the first right-angle mounting surface; the rod head 6 is connected to the end rod 22 .

[0059] According to the structure described above, it can be known that the end of the main rod 21 forms an annular first right-angle mounting surface, and the inner wall of the adjustment sleeve 3 forms an annular second right-angle mounting surface, and when the piston rod 2 and the adjustment sleeve 3 are assembled, the second right-angle mounting surface cooperates with the first right-angle mounting surface, thereby limiting the adjustment sleeve 3 and making the assembly of the adjustment sleeve 3 and the piston rod 2 more firm and more stable.

[0060] Furthermore, preferably, the main rod 21 and the end rod 22 are of an integrated structure. Of course, this is not limited thereto, and they may also be of a split structure, assembled together by welding or the like.

[0061] In this embodiment, preferably, Figure 1 As shown, the cylinder body 1 includes a cylinder body 101 and an end cover 102; wherein the end cover 102 is sleeved and fixed on one end of the cylinder body 101 along its length direction, and the end cover 102 is formed with a mounting cavity and two through holes connected to the mounting cavity, and the piston rod 2 extends into the mounting cavity through one of the through holes, and the piston rod 2 extends out of the mounting cavity through the other through hole; the adjustment sleeve 3 abuts against the end of the end cover 102 away from the cylinder body 101.

[0062] According to the structure described above, the cylinder body 101 plays a major supporting role for the piston rod 2 , and the end cover 102 is used to cover the cylinder body 101 , and the following sealing and limiting structures can be installed in the end cover 102 .

[0063] In this embodiment, preferably, Figure 1 As shown, the end cover 102 is connected to the cylinder body 101 through threads.

[0064] According to the structure described above, the end cover 102 and the cylinder body 101 are connected in a detachable manner, which is convenient for adjustment and subsequent maintenance.

[0065] It should be noted that the connection method between the end cover 102 and the cylinder body 101 is not limited to the above-mentioned threaded connection. The end cover 102 and the cylinder body 101 can also be connected by welding or other methods, which makes the connection more stable and firm.

[0066] In this embodiment, preferably,Figure 1 As shown, the hydraulic cylinder further includes a first sealing ring 8 , which is sleeved on the outside of the cylinder body 101 and located inside the end cover 102 .

[0067] According to the structure described above, it can be known that the first sealing ring 8 plays a role in sealing the gap between the cylinder body 101 and the end cover 102, thereby improving the sealing effect.

[0068] Further, preferably, the first sealing ring 8 can be an O-ring, but of course, it is not limited thereto and can be designed according to actual needs.

[0069] In this embodiment, preferably, Figure 1 As shown, the hydraulic cylinder also includes a second sealing ring 9, a retaining ring 10 and a guide ring 11; wherein the second sealing ring 9, the retaining ring 10 and the guide ring 11 are all sleeved outside the piston rod 2, and the second sealing ring 9, the retaining ring 10 and the guide ring 11 are located between the cylinder body 101 and the adjustment sleeve 3; the retaining ring 10 abuts against the inner wall of the end cover 102 close to the rod head 6.

[0070] According to the structure described above, the second sealing ring 9 plays a sealing role, the guide ring 11 plays a guiding role for the piston rod 2, and the retaining ring 10 plays a role of limiting and increasing strength.

[0071] Further, preferably, the number of the second sealing rings 9 is two, and they are sequentially arranged along the length direction of the piston rod 2, and preferably, one of the second sealing rings 9 is a Y-shaped sealing ring, and one of the second sealing rings 9 is a step seal. Of course, the number and structure of the second sealing rings 9 are not limited to the above, and can also be designed according to actual needs.

[0072] In this embodiment, preferably, Figure 1 As shown, the first connection portion 61 is a mounting through hole, and the club head 6 is detachably connected to the corresponding target site through the mounting through hole and the fastening member.

[0073] According to the structure described above, a mounting through hole is opened on the rod head 6, and a fastening member such as a bolt or a pin can be passed through the mounting through hole to connect with the through hole on the target ground, thereby realizing a rotatable and detachable connection between the rod head 6 and the target ground, which is convenient for installation and disassembly.

[0074] Further, preferably, the end of the rod head 6 that is away from the cylinder body 1 is formed with the aforementioned first connecting portion 61 , but of course, it is not limited thereto.

[0075] It should be noted that the first connection portion 61 is not limited to the above-mentioned installation through hole, and the first connection portion 61 can also be a pin shaft arranged on the rod head 6, which can be matched with the through hole on the target ground.

[0076] In this embodiment, preferably, as Figure 1 shown, the oil cylinder body 1 is formed with a second connecting portion 1011 for rotatably connecting to a target ground. Preferably, the second connecting portion 1011 is also an installation through hole, and fastening members such as bolts or pin shafts can pass through this installation through hole and be connected to the through hole on the target ground, realizing a rotatable and detachable connection mode between the club head 6 and the target ground, which is convenient for installation and disassembly.

[0077] Further, preferably, the second connecting portion 1011 is formed at one end of the oil cylinder body 1 facing away from the club head 6. Of course, it is not limited thereto.

[0078] It should be noted that: the second connecting portion 1011 is not limited to the above-mentioned installation through hole, and the second connecting portion 1011 can also be a pin shaft provided on the club head 6, which can cooperate with the through hole on the target ground.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic cylinder, characterized in that: include: A cylinder body, a piston rod, an adjusting sleeve, a locking nut, an adjusting sleeve and a rod head; wherein the piston rod is movably installed in the cylinder body; and the adjusting sleeve is connected to the piston rod exposed from the cylinder body; The adjusting sleeve and the locking nut are sequentially sleeved on the outside of the adjusting sleeve and are both threadably connected to the adjusting sleeve, and the adjusting sleeve can be tightened by the locking nut; The rod head is connected to the structure of the piston rod exposed outside the adjustment sleeve, and the rod head is formed with a first connecting portion for rotatably and detachably connecting with a target.

2. The hydraulic cylinder according to claim 1, characterized in that: The adjusting sleeve is threadably connected to the piston rod.

3. The hydraulic cylinder according to claim 2, characterized in that: The hydraulic cylinder also includes a fixing nut, which is sleeved outside the piston rod and is used to press the adjustment sleeve; the rod head abuts against a side of the fixing nut that is away from the adjustment sleeve.

4. The hydraulic cylinder according to claim 1, characterized in that: The rod head is formed with a cavity, and the structure of the piston rod exposed outside the adjustment sleeve extends into the cavity and is threadably connected to the rod head.

5. The hydraulic cylinder according to claim 1, characterized in that: The piston rod comprises a main rod and an end rod connected in sequence; wherein the diameter of the end rod is smaller than that of the main rod, so that the end of the main rod forms an annular first right-angle mounting surface; The adjusting sleeve is in a cap shape, and the inner wall of the adjusting sleeve is formed with an annular second right-angle mounting surface matching the first right-angle mounting surface; the rod head is connected to the end rod.

6. The hydraulic cylinder according to claim 1, characterized in that: The cylinder body includes a cylinder body and an end cover; wherein the end cover is sleeved and fixed on one end of the cylinder body along its length direction, and the end cover is formed with a mounting cavity and two through holes connected to the mounting cavity, and the piston rod extends into the mounting cavity through one of the through holes, and the piston rod extends out of the mounting cavity through the other through hole; the adjustment sleeve abuts against the end of the end cover away from the cylinder body.

7. The hydraulic cylinder according to claim 6, characterized in that: The end cover is connected to the cylinder body by welding or by threads.

8. The hydraulic cylinder according to claim 6, characterized in that: The hydraulic oil cylinder further comprises a first sealing ring, which is sleeved on the outside of the cylinder body and located inside the end cover.

9. The hydraulic cylinder according to claim 6, characterized in that: The hydraulic cylinder also includes a second sealing ring, a retaining ring and a guide ring; wherein the second sealing ring, the retaining ring and the guide ring are all sleeved outside the piston rod, and the second sealing ring, the retaining ring and the guide ring are located between the cylinder body and the adjustment sleeve; the retaining ring rests on the inner wall of the end cover close to the rod head.

10. The hydraulic cylinder according to any one of claims 1 to 9, characterized in that: The first connection portion is a mounting through hole, and the club head is detachably connected to a corresponding target location through the mounting through hole and a fastening member; and / or The oil cylinder body is formed with a second connection portion for rotationally connecting with a target site.

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