A cylinder

Abstract

The utility model discloses a kind of oil cylinders, including cylinder barrel, first oil cavity is equipped in the cylinder barrel, piston and piston rod installed in the cylinder barrel, the opening end of the cylinder barrel is sealed by first end cover, one end of the piston rod is fixedly connected with the piston, the other end passes through first end cover, the piston rod inside is provided with second oil cavity, the both ends of the piston rod are provided with first oil hole and second oil hole being communicated with second oil cavity, second oil cavity is communicated with first oil cavity by second oil hole, oil liquid is through first oil hole, second oil cavity, second oil hole to first oil cavity cylinder barrel jacking. Through the above mode, the utility model is jacked by cylinder barrel, greatly increases the bearing capacity, increases the deflection and rigidity of oil cylinder, is suitable for more devices and some specific occasions, prolongs the service life of oil cylinder.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder. Background Technology

[0002] Currently, hydraulic cylinders generally operate with a fixed cylinder body and a moving piston rod, with the working fluid entering and exiting through an interface located on the cylinder body. However, some equipment, due to structural requirements, uses a fixed piston rod and moving cylinder body. In such cases, the oil pipe connected to the cylinder body interface will interfere with the normal operation of the hydraulic cylinder. Even with a flexible hose connection, the hose needs to be lengthened to accommodate the cylinder's stroke. When the cylinder's stroke is large, the extra hose length will occupy significant space, greatly affecting the equipment's structural dimensions. Furthermore, the retraction and extension of the hose during cylinder movement can cause excessive wear, shortening its lifespan and potentially leading to abnormal entanglement accidents. All of these factors significantly limit the application of cylinder-type hydraulic cylinders. Utility Model Content

[0003] The main technical problem this invention addresses is to provide a hydraulic cylinder that overcomes the aforementioned issues.

[0004] To solve the above-mentioned technical problems, the present invention provides a hydraulic cylinder, including a cylinder barrel, a first oil chamber inside the cylinder barrel, a piston and a piston rod installed inside the cylinder barrel, the open end of the cylinder barrel being sealed by a first end cap, one end of the piston rod being fixedly connected to the piston, and the other end passing through the first end cap, a second oil chamber being provided inside the piston rod, and a first oil hole and a second oil hole being provided at both ends of the piston rod, communicating with the second oil chamber, the second oil chamber being connected to the first oil chamber through the second oil hole, and oil flowing through the first oil hole, the second oil chamber, and the second oil hole to the first oil chamber to lift the cylinder barrel. The hydraulic cylinder of this application is used in an inverted manner, that is, the piston rod is fixed below, and the cylinder barrel moves above. When oil enters the second oil chamber from the first oil hole of the piston rod and flows from the second oil hole to the first oil chamber, the pressure of the oil lifts the cylinder barrel; conversely, when oil returns from the first oil chamber through the second oil hole and flows out again from the first oil hole, the cylinder barrel descends. The lifting motion via the cylinder increases the cylinder's flexibility and rigidity, making it suitable for more devices and specific applications, and extending the cylinder's service life.

[0005] The piston is located at the outer end of the piston rod. When the piston is located outside the piston rod, the second oil hole is connected to the first oil chamber, allowing the oil to enter the first oil chamber directly from the second oil hole, ensuring that the oil enters the first oil chamber smoothly. The pressure of the oil causes the cylinder to move upward.

[0006] The piston has only a guide ring at its outer diameter, without a sealing ring.

[0007] A buffer assembly is provided between the end of the second oil hole of the piston rod and the cylinder. The buffer assembly between the cylinder and the piston rod in this application provides cushioning during the cylinder's descent and recovery, preventing hard contact between the cylinder and the piston rod.

[0008] The buffer assembly includes a protrusion facing the piston rod, and the end of the second oil hole of the piston rod is provided with a groove that matches the protrusion. In this application, the second oil hole of the piston rod communicates with the groove; when the protrusion descends into the groove, it can block oil from entering the first oil chamber of the cylinder.

[0009] The protrusion is conical, and the diameter of the part of the protrusion that contacts the cylinder gradually decreases. Specifically, an anti-slip layer is provided between the protrusion and the groove, allowing the protrusion to slowly enter the groove and thus protecting the piston rod.

[0010] The first end cap is fitted with a sealing kit for mating with the piston rod. Specifically, the outer end of the first end cap has a flat opening for easy clamping with a wrench.

[0011] The sealing kit includes a dustproof ring, a second guide ring, and a sealing ring. One end of the guide ring is fixedly connected to the first end cap. The outer and inner walls of the guide ring are respectively equipped with a dustproof ring and a sealing ring to ensure a tight seal between the first end cap and the piston rod and prevent oil leakage.

[0012] A fixing assembly is installed on the piston rod passing through the first end cap for fixing the piston rod.

[0013] The fixing assembly includes a fixing plate and a stop. The end of the piston rod that passes through the first end cover forms the stop in a stepped shape, which is used to limit and fix the fixing plate. Specifically, the fixing plate is used for fixed installation with the equipment. The fixing plate is provided with mounting holes. After the piston rod passes through the mounting holes, the stop is used to limit the position of the fixing plate and fix it to it, ensuring that the piston rod remains fixed when the cylinder performs a lifting movement.

[0014] The diameters of the first oil hole and the second oil hole are smaller than the diameter of the second oil cavity.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a hydraulic cylinder that is used inverted, with the piston rod fixed below and the cylinder moving above. When hydraulic fluid enters the second oil chamber from the first oil hole on the piston rod and flows from the second oil hole to the first oil chamber, the pressure of the hydraulic fluid lifts the cylinder. Conversely, when the hydraulic fluid flows from the first oil chamber back to the first oil chamber through the second oil hole and then out again from the first oil hole, the cylinder descends. This lifting motion of the cylinder increases the cylinder's flexibility and rigidity, making it suitable for more devices and specific applications, and extending the cylinder's service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder according to this utility model; Figure 2 yes Figure 1 The right view; Figure 3 yes Figure 1 A sectional view; Figure 4 This is a schematic diagram of the structure of a piston rod of a hydraulic cylinder according to this utility model; Figure 5 This is a structural schematic diagram of a sealing kit for a hydraulic cylinder according to the present invention; Figure 6 This is a schematic diagram of the hydraulic oil flow direction of a cylinder according to this utility model. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0018] Please see Figures 1-6 The embodiments of this utility model include: This utility model discloses a hydraulic cylinder, including a cylinder barrel 1, a first oil chamber inside the cylinder barrel 1, a piston 2 and a piston rod 3 installed inside the cylinder barrel 1, the open end of the cylinder barrel 1 being sealed by a first end cap 4, one end of the piston rod 3 being fixedly connected to the piston 2, and the other end passing through the first end cap 4, a second oil chamber 31 being provided inside the piston rod 3, and a first oil hole 32 and a second oil hole 33 being provided at both ends of the piston rod 3, which are connected to the second oil chamber 31. The second oil chamber 31 is connected to the first oil chamber through the second oil hole 32, and hydraulic fluid flows through the first oil hole 32, the second oil chamber 31, and the second oil hole 33 to the first oil chamber to lift the cylinder barrel 1. This hydraulic cylinder is used in an inverted configuration, with the piston rod fixed at the bottom and the cylinder moving at the top. When hydraulic fluid enters the second oil chamber from the first oil hole on the piston rod and flows from the second oil hole to the first oil chamber, the pressure of the fluid lifts the cylinder. Conversely, when fluid flows from the first oil chamber back to the first oil chamber through the second oil hole and then out through the first oil hole, the cylinder descends. This lifting motion of the cylinder increases its flexibility and rigidity, making it suitable for more devices and specific applications, and extending its service life.

[0019] The piston 2 is located at the outer end of the piston rod 3. Only a first guide ring 21 is provided on the outer diameter of the piston.

[0020] When the piston is positioned outside the piston rod, the second oil hole is connected to the first oil chamber, allowing the oil to enter the first oil chamber directly from the second oil hole, ensuring that the oil enters the first oil chamber smoothly. The pressure of the oil causes the cylinder to move upward.

[0021] A buffer assembly 6 is provided between the end of the second oil hole 33 of the piston rod 3 and the cylinder 1. The buffer assembly provided between the cylinder and the piston rod in this application provides cushioning when the cylinder descends and falls back, avoiding hard contact between the cylinder and the piston rod.

[0022] The buffer assembly 6 includes a protrusion 61 protruding towards the piston rod 3, and the end of the second oil hole of the piston rod 3 is provided with a groove 62 that matches the protrusion 61. The second oil hole of the piston rod in this application communicates with the groove, and when the protrusion descends into the groove, it can block the oil from entering the first oil chamber of the cylinder.

[0023] The protrusion 61 is conical, and the diameter of the bottom of the protrusion gradually decreases at the contact point with the cylinder. Specifically, an anti-slip layer is provided between the protrusion 61 and the groove 62, allowing the protrusion to slowly enter the groove and providing a cushioning effect. Of course, in specific implementations, the protrusion can also take other shapes, such as rectangles or squares; the anti-slip layer can also be a sealing ring, etc., and any structure that provides anti-slip and sealing functions is within the protection scope of this application.

[0024] The first end cap is fitted with a sealing kit 7 for mating with the piston rod 3. Specifically, the outer end of the first end cap has a flat opening for easy clamping with a wrench.

[0025] The sealing kit 7 includes a dustproof ring 71, a second guide ring 72, and a sealing ring 73. One end of the guide ring is fixedly connected to the first end cover. The outer and inner walls of the guide ring are respectively equipped with a dustproof ring and a sealing ring to ensure a tight seal between the first end cover and the piston rod and prevent oil leakage.

[0026] A fixing assembly 8 is installed on the piston rod 3 that passes through the first end cap 4 to fix the piston rod.

[0027] The fixing component 8 includes a fixing plate 81 and a stop 82. The end of the piston rod that passes through the first end cover forms the stop in a stepped shape, which is used to limit and fix the fixing plate. Specifically, the fixing plate is used for fixed installation with the equipment. The fixing plate is provided with mounting holes. After the piston rod passes through the mounting holes, the stop is used to limit the position of the fixing plate and fix it to it, ensuring that the piston rod remains fixed when the cylinder performs a lifting movement.

[0028] The diameters of the first oil hole 32 and the second oil hole 33 are smaller than the diameter of the second oil cavity 31.

[0029] The piston rod 3 is fitted with a stroke adjustment sleeve 9. One end of the stroke adjustment sleeve is fixedly installed to the piston, and the distance between the other end of the stroke adjustment sleeve and the guide ring is the lifting height of the cylinder. Specifically, by changing the length of the stroke adjustment sleeve, the lifting height of the cylinder can be changed, making the hydraulic cylinder of this application suitable for more equipment. The length of the stroke adjustment sleeve can be changed according to the usage requirements, thereby achieving the purpose of changing the lifting height of the hydraulic cylinder.

[0030] This utility model discloses a hydraulic cylinder that operates in an inverted manner, with the piston rod fixed at the bottom and the cylinder moving at the top. When hydraulic fluid enters the second oil chamber from the first oil hole on the piston rod and flows from the second oil hole to the first oil chamber, the pressure of the hydraulic fluid lifts the cylinder. Conversely, when the hydraulic fluid flows from the first oil chamber back to the first oil chamber through the second oil hole and then flows out again from the first oil hole, the cylinder descends. This lifting motion of the cylinder increases the cylinder's flexibility and rigidity, making it suitable for more devices and specific applications, and extending the cylinder's service life.

[0031] The installation method of the hydraulic cylinder in this application requires that the first end cover and sealing kit be installed and then placed on the piston rod. Then, the piston and piston rod are installed and fixed. The length of the stroke adjustment sleeve is confirmed according to the requirements and fixedly installed with the piston. Then, the piston rod with the sealing kit, piston, and stroke adjustment sleeve installed is inserted into the cylinder. Finally, the first end cover and second end cover are screwed on, and the fixing plate is fixed to the piston rod. The fixing plate is fixedly installed with the equipment according to the usage requirements.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hydraulic cylinder, characterized in that, The device includes a cylinder, a first oil chamber inside the cylinder, a piston and a piston rod installed inside the cylinder, an open end of the cylinder sealed by a first end cap, one end of the piston rod fixedly connected to the piston, and the other end passing through the first end cap, a second oil chamber inside the piston rod, and a first oil hole and a second oil hole connected to the second oil chamber at both ends of the piston rod, the second oil chamber being connected to the first oil chamber through the second oil hole, and oil flowing through the first oil hole, the second oil chamber, and the second oil hole to the first oil chamber to lift the cylinder.

2. A hydraulic cylinder according to claim 1, characterized in that, The piston is disposed at the outer end of the piston rod, and only a first guide ring is disposed on the outer diameter of the piston.

3. A hydraulic cylinder according to claim 1, characterized in that, A buffer assembly is provided between the end of the second oil hole of the piston rod and the cylinder.

4. A hydraulic cylinder according to claim 3, characterized in that, The buffer assembly includes a protrusion that protrudes toward the piston rod, and the end of the second oil hole of the piston rod is provided with a groove that matches the protrusion.

5. A hydraulic cylinder according to claim 4, characterized in that, The protrusion is conical, and the diameter of the bottom of the protrusion at the contact point with the cylinder gradually decreases.

6. A hydraulic cylinder according to claim 1, characterized in that, The first end cap is fitted with a sealing kit for mating with the piston rod.

7. A hydraulic cylinder according to claim 1, characterized in that, A fixing assembly is installed on the piston rod passing through the first end cap for fixing the piston rod.

8. A hydraulic cylinder according to claim 7, characterized in that, The fixing component includes a fixing plate and a stop. The end of the piston rod that passes through the first end cover forms the stop in a stepped shape, which is used to limit and fix the fixing plate.

9. A hydraulic cylinder according to claim 1, characterized in that, The diameters of the first oil hole and the second oil hole are smaller than the diameter of the second oil cavity.

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