Water and gas injection type rotary oil cylinder

Abstract

The invention discloses a water and gas injection type rotary oil cylinder. The rotary oil cylinder comprises an oil distributor, a cylinder body and a piston assembly arranged in the cylinder body. The oil separator comprises an oil separator main body and an oil separator end cover, the oil separator main body and the oil separator end cover are provided with a water and gas injection channel, the piston rod is of a pipeline structure, and the water and gas injection channel of the oil separator is connected with a pipeline of the piston rod to form a water and gas inlet channel of the rotary oil cylinder; the inner wall of the oil separator main body is provided with a plurality of oil separation paths, the cylinder body is internally provided with a plurality of oil path channels, the plurality of oil separation paths are connected with the plurality of oil path channels in a one-to-one correspondence manner, and a plurality of mutually independent working oil paths are formed in the rotary oil cylinder. By arranging a plurality of working oil ways, oil way driving of various working operations can be integrated on the rotary oil cylinder, and the practicability of the rotary oil cylinder is improved.

Description

Technical Field

[0001] This invention relates to the field of rotary cylinder technology, specifically to a water-injection / air-injection type rotary cylinder. Background Technology

[0002] Existing rotary cylinders control the extension and retraction of the piston rod through an oil circuit, thereby controlling the opening and closing of the gripper at the working end or the extension and retraction of the spindle. Due to the simple internal oil circuit design of existing rotary cylinders, their functions are limited. For machine tools that require multiple operations, multiple sets of cylinder structures or power components are needed to meet the processing requirements. Therefore, there is an urgent need for an integrated rotary cylinder structure that can meet the needs of multiple operation drives. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a water-injection and air-injection type rotary cylinder. By integrating multiple working oil circuits inside the cylinder body and forming independent driving oil circuits with an oil distributor, it can simultaneously meet different working operation requirements and improve the practicality of the rotary cylinder.

[0004] This invention provides a water-injection and air-injection type rotary cylinder, the rotary cylinder comprising: an oil distributor, a cylinder body, and a piston assembly disposed inside the cylinder body;

[0005] The oil separator includes an oil separator body and an oil separator end cap. The oil separator body and the oil separator end cap are provided with water injection and air injection channels. The piston rod is a pipe structure. The water injection and air injection channels of the oil separator are connected to the pipe of the piston rod to form the water inlet and air inlet channels of the rotary cylinder.

[0006] The inner wall of the oil distributor body is provided with several oil distribution channels, and the cylinder body is provided with several oil passages. The oil distribution channels are connected one-to-one with the oil passages, forming several independent working oil circuits in the rotary cylinder.

[0007] Furthermore, the oil separator end cap is provided with a water injection port or an air injection port.

[0008] Furthermore, the cylinder block includes a cylinder block end cap and a cylinder block body, and the oil distributor is disposed on the outwardly extending end of the cylinder block end cap;

[0009] The piston assembly includes a piston rod and a piston sleeved on the piston rod, the piston being located inside the cylinder body.

[0010] Furthermore, a copper sleeve is provided between the oil distributor end cap and the cylinder block end cap;

[0011] A flow divider hole is provided on one side of the copper sleeve.

[0012] Furthermore, the distributor end cap is also provided with an oil seal, which is located at one end of the distributor end cap near the distributor body.

[0013] Furthermore, the oil separator body is provided with skeleton oil seals at both ends to prevent oil overflow.

[0014] Furthermore, the oil separator body is also provided with two inclined return oil channels;

[0015] One end of the oil return channel is located below the oil seal position of the oil distributor body, and the other end of the oil return channel is connected to the oil return port in the middle of the oil return body.

[0016] Furthermore, the inner wall of the oil distributor body is provided with several oil distribution grooves, and one end of the cylinder head is provided with several oil passages, with the oil distribution grooves and oil passages connected one-to-one.

[0017] This invention provides a water-injection and air-injection type rotary cylinder. By integrating multiple working oil circuits inside the cylinder body and forming independent drive oil circuits with an oil distributor, it can simultaneously meet different working operation requirements and improve the practicality of the rotary cylinder. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the water-injection and air-injection type rotary cylinder in an embodiment of the present invention;

[0020] Figure 2 This is a structural cross-sectional view of the water-injection and air-injection type rotary cylinder in an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the water-injection and air-injection type rotary cylinder from another angle in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 3 This invention provides a water-injection and air-injection type rotary cylinder, which includes: an oil distributor, a cylinder body, and a piston assembly disposed inside the cylinder body;

[0024] The oil separator 1 includes an oil separator body 12 and an oil separator end cap 11. The oil separator body 12 and the oil separator end cap 11 are provided with water injection and air injection channels 111. The piston rod 31 is a pipe structure. The water injection and air injection channels 111 of the oil separator 1 are connected to the pipe of the piston rod 31 to form the water inlet and air inlet channels of the rotary cylinder.

[0025] The inner wall of the oil distributor body 12 is provided with several oil distribution channels, and the cylinder body 2 is provided with several oil passages. The oil distribution channels are connected one-to-one with the oil passages, forming several independent working oil circuits in the rotary cylinder.

[0026] The distributor 1 consists of a distributor body 12 and a distributor end cap 11. The distributor body 12 is the core part of the distributor 1, carrying the main fluid passage, while the distributor end cap 11 is used to close one end of the distributor body 12 and provide an external interface. For example, the distributor body 12 can be formed by one-piece casting, and the distributor end cap 11 is connected to the distributor body 12 by bolts to ensure good sealing.

[0027] Both the distributor body 12 and the distributor end cap 11 are provided with water and air injection channels 111. These channels are used to guide water or gas media into or out of the oil cylinder. For example, these water and air injection channels 111 can be designed as axially extending channels inside the distributor body 12, with corresponding connection holes on the distributor end cap 11 to facilitate external pipeline access. Alternatively, the water and air injection channels 111 can be designed as semi-circular grooves formed on the mating surfaces of the distributor body 12 and the distributor end cap 11, forming a complete channel when the two are joined.

[0028] The piston rod 31 is designed as a pipe structure. This means that the piston rod 31 has a hollow channel inside, which can be used to transport fluid media and can meet the requirements of operations such as water cooling or air cooling at the working end and cleaning.

[0029] The water and air inlet channel 111 of the distributor 1 is connected to the pipe of the piston rod 31, forming the water and air inlet channel of the rotary cylinder. This connection method ensures that water or gas can smoothly enter the pipe inside the piston rod 31 from the distributor 1 and be further transported to the inside or outside of the cylinder. For example, the connection between the distributor 1 and the piston rod 31 can adopt a rotary seal structure, allowing the piston rod 31 to maintain fluid communication during rotation or extension. Another connection method is that the end of the channel inside the distributor 1 is connected to the pipe inlet of the piston rod 31 through a radial hole and sealed by a sealing ring.

[0030] The inner wall of the distributor body 12 is provided with several oil distribution passages. These oil distribution passages are used to introduce hydraulic oil from the outside and distribute it to specific areas inside the cylinder. For example, these oil distribution passages can be designed as annular grooves or axial holes along the inner wall of the distributor body 12, and their number and position are configured according to the functional requirements of the cylinder.

[0031] The cylinder 2 has several oil passages inside. These oil passages cooperate with the distribution oil passages to guide hydraulic oil to different working chambers of the piston assembly 3, thereby achieving precise control of the piston 32's movement. For example, these oil passages can be designed as channels machined into the inner wall of the cylinder 2, or implemented by setting independent oil guide pipes inside the cylinder 2.

[0032] Several hydraulic distribution lines are connected one-to-one with several hydraulic passages, forming several independent working hydraulic circuits within the rotary cylinder. This one-to-one connection ensures that the hydraulic oil distributed by each distribution line can accurately enter the corresponding hydraulic passage in the cylinder 2, thus forming an independent hydraulic circuit. For example, each distribution line on the distributor body 12 can be aligned and connected to a hydraulic passage on the cylinder 2 through a radial hole, and the isolation between the lines is ensured by a seal. Thus, each working hydraulic circuit can independently control different movement directions or speeds of the piston assembly 3. For example, one working hydraulic circuit controls the extension of the piston 32, another working hydraulic circuit controls the retraction of the piston 32, or multiple working hydraulic circuits can control different clamping or rotation functions respectively.

[0033] Specifically, the distributor end cap 11 is provided with a water / air injection port. This port is used for external fluid media (water or air) to enter the water / air inlet channel inside the rotary cylinder. The port can be designed as a threaded interface for easy connection to pipelines via threads; it can also be designed as a quick-connect fitting for rapid connection and disconnection; or it can be designed as a flange interface to adapt to high-flow or high-pressure applications.

[0034] The water-injection and air-injection type rotary cylinder of this application has a water-injection and air-injection port on its distributor end cover 11. This water-injection and air-injection port serves as the inlet for external fluid media (water or air) to enter the cylinder and is connected to the water-injection and air-injection channel 111 inside the distributor end cover 11. When an external water or air supply device is connected through this water-injection and air-injection port, the water or air medium can smoothly enter the water-injection and air-injection channel 111 of the distributor end cover 11, and further flow through the water-injection and air-injection channel 111 of the distributor body 12, and finally enter the pipe structure of the piston rod 31, forming the water-inlet and air-inlet channel of the rotary cylinder. In this way, external water or air media can be effectively introduced into the cylinder, thereby realizing the water-injection or air-injection operation inside the cylinder, ensuring that the cylinder can work normally under specific working conditions, such as for cooling, lubrication, or providing auxiliary power. The presence of this water and air injection port enables the entire water and air injection system to have complete external connection capabilities, solves the practical operational problem of medium introduction, and allows the rotary cylinder to fully perform its functions.

[0035] Specifically, the cylinder body 2 includes a cylinder end cap 21 and a cylinder body 22, with the oil distributor 1 disposed on the outwardly extending end of the cylinder end cap 21. The piston assembly 3 includes a piston rod 31 and a piston 32 sleeved on the piston rod 31, the piston 32 being located inside the cylinder body 22. The cylinder body 2 is the outer shell of the rotary cylinder, used to house the piston assembly 3 and form a working chamber. Subdividing it into the cylinder end cap 21 and the cylinder body 22 allows for modular design and manufacturing. The cylinder body 22 is typically the main body of the cylinder, with a large length and internal cavity, while the cylinder end cap 21 is used to close one end of the cylinder body 22 and provides an interface for installing other components. This split structure facilitates machining different parts with varying precision requirements; for example, the inner surface of the cylinder body 22 requires high-precision machining to ensure smooth movement and sealing of the piston 32, while the cylinder end cap 21 may require a more complex mounting structure.

[0036] The oil distributor 1 is the core component responsible for distributing oil and water / air. Positioning it on the outward-extending end of the cylinder block end cap 21 means that the oil distributor 1 and the cylinder block end cap 21 form an integrated or tightly connected unit. This layout helps shorten the length of the oil and water / air passages, reduces the risk of leakage, and simplifies the overall assembly process. The outward-extending design provides sufficient installation space for the oil distributor 1 while avoiding interference with the movement of the piston 32 inside the cylinder block 2. For example, the cylinder block end cap 21 can be designed with a protruding flange or sleeve structure, to which the oil distributor 1 is bolted; alternatively, the cylinder block end cap 21 can be directly machined with mounting holes and positioning structures to mate with the oil distributor 1, allowing the oil distributor 1 to be directly inserted and fixed.

[0037] The piston rod 31 serves as a power output or input component, and its piping structure is used for water / air passage. The piston 32 moves inside the cylinder 2, converting fluid pressure into mechanical force or vice versa. The piston 32 is fitted onto the piston rod 31, meaning that there is a relatively fixed connection between the piston 32 and the piston rod 31, usually achieved through threads, key connections, interference fits, or welding, to ensure synchronous movement and force transmission between the two.

[0038] The cylinder body 22 provides the enclosed space required for the movement of the piston 32 and forms the working chamber. The reciprocating motion of the piston 32 inside the cylinder body 22 drives the piston rod 31 to extend and retract through the pressure difference formed at its two ends. This positioning ensures that the piston 32 can effectively divide the internal space of the cylinder, forming different pressure chambers, thereby realizing the push-pull function of the cylinder. The piston 32 moves linearly under the guidance of the inner wall of the cylinder body 22; or, a dynamic seal is achieved between the piston 32 and the cylinder body 22 through a sealing ring to ensure that the working medium does not leak.

[0039] Specifically, a copper sleeve 5 is provided between the distributor end cap 11 and the cylinder end cap 21, and a flow-diverting hole is provided on one side of the copper sleeve 5. The copper sleeve 5 is a sleeve-shaped part made of copper alloy, which is usually used for the fit between the shaft and the hole, and plays a role in support, guidance, friction reduction and auxiliary sealing. The copper sleeve 5 can be installed in the hole of the distributor end cap 11 or the cylinder end cap 21 by press-fit, or fixed by threaded connection. Its material can be a bronze alloy with good self-lubricating and wear resistance, such as tin bronze or aluminum bronze. In some other embodiments, the copper sleeve 5 can also be designed with a flange structure, which is fixed to one of the end caps by bolts, and the other end contacts the mating surface of the other end cap. In order to further improve its wear resistance, the surface of the copper sleeve 5 can be specially treated, such as carburizing, chrome plating or spraying a friction-reducing coating. The flow-diverting hole is a hole opened in the side wall of the copper sleeve 5, which serves to guide the fluid (usually oil) from one area to another, or to divert it in a specific area. The diversion orifice can be located on the side of the copper sleeve 5 near the cylinder end cap 21 to receive lubricating oil from inside the cylinder end cap 21 and guide it to the mating surface between the copper sleeve 5 and the distributor end cap 11. The diversion orifice can be one or more radial holes. In other embodiments, the diversion orifice can also be located on the side of the copper sleeve 5 near the distributor end cap 11 to return oil between the mating surfaces of the copper sleeve 5 and the distributor end cap 11 to a specific channel inside the cylinder 2, or to balance the pressure in that area. The diversion orifice can be designed as an annular groove along the circumferential direction and communicate with one or more radial holes.

[0040] Specifically, an oil seal 6 is provided on the distributor end cover 11, and the oil seal 6 is located at one end of the distributor end cover 11 near the distributor body 12. The oil seal 6 is a device for sealing fluid leakage between rotating or reciprocating moving parts, and is usually made of elastic material and metal skeleton, forming a seal through the contact between the lip and the mating surface.

[0041] Furthermore, the oil seal 6 can adopt various structural forms. It can be a radial lip oil seal 6, whose sealing lip radially presses against the surface of the rotating shaft for sealing; it can also be an axial end face oil seal 6, which seals by pressing the two end faces against each other; or it can be a V-ring oil seal 6, which seals by contacting the surface of the shaft or hole with its V-shaped lip. The introduction of the oil seal 6 is intended to effectively prevent oil leakage, ensure the integrity of the oil inside the oil cylinder, and prevent external contaminants from entering. The oil seal 6 is located at one end of the distributor end cover 11 near the distributor body 12, which means that the oil seal 6 is precisely installed in the critical area where the distributor end cover 11 connects to or is adjacent to the distributor body 12, aiming to directly seal any fluid leakage paths that may exist in this area.

[0042] Specifically, the oil distributor body 12 is equipped with skeleton oil seals 4 at both ends to prevent oil overflow. The skeleton oil seal 4 is a self-tightening lip seal, typically composed of a rubber sealing body, a metal skeleton, and a helical spring. The metal skeleton is used to enhance the rigidity of the oil seal 6 and maintain its shape, while the helical spring is used to apply radial force to the sealing lip, making it tightly fit against the surface of the shaft or hole, thereby achieving a seal.

[0043] By installing skeleton oil seals 4 at both ends of the distributor body 12, oil overflow from both ends of the distributor body 12 can be effectively prevented. In the above-mentioned water-injection and air-injection type rotary cylinder, the distributor body 12 is responsible for distributing oil to the oil passages inside the cylinder body 2 through the oil distribution circuit. This process involves the flow of oil under a certain pressure. The skeleton oil seal 4, with its sealing lip and the assistance of a spring, maintains continuous tight contact and pressure with the mating surface (such as the inner surface of the distributor end cap 11 or the copper sleeve 5), thereby forming an effective barrier to prevent oil leakage from the connection gap between the distributor body 12 and surrounding components. This ensures that the oil can be accurately guided to the predetermined working oil circuit, maintains the integrity and pressure of the hydraulic system, and thus ensures the stable and efficient operation of the rotary cylinder.

[0044] Specifically, the oil separator body 12 is also provided with two inclined oil return channels 121; one end of the oil return channel 121 is located below the oil seal 6 of the oil separator body 12, and the other end of the oil return channel 121 is connected to the oil return port in the middle of the oil separator body. The inclined oil return channel 121 refers to a channel provided inside the oil separator body 12 for guiding the return flow of oil, whose axis is at a certain angle to the central axis or surface of the oil separator body 12, rather than being parallel or perpendicular. This inclined design helps to utilize gravity or fluid dynamics principles to guide the return flow of oil more effectively and reduce the retention of oil in the channel. For example, the channel can be spiral or obliquely straight through the wall thickness of the oil separator body 12, or the channel can be stepped or gradually inclined to adapt to different structural spaces and fluid characteristics. One end of the oil return channel 121 is located below the oil seal 6 of the oil separator body 12, aiming to collect and drain oil that may accumulate below the skeleton oil seal 4. For example, the inlet of the return oil channel 121 can be located below the skeleton oil seal 4, adjacent to the sealing lip of the skeleton oil seal 4, to maximize the capture of leaked oil. Alternatively, the inlet of the return oil channel 121 can be an annular groove surrounding the area below the skeleton oil seal 4, ensuring that the oil can be fully collected. The other end of the return oil channel 121 is connected to the return oil port in the middle of the return oil body, used to guide the collected oil back to the central return oil system inside the distributor body 12, realizing the recycling or discharge of the oil. For example, the outlet of the return oil channel 121 can be directly connected to the central return oil chamber inside the distributor body 12, or the outlet of the return oil channel 121 can be connected to a separate oil collection chamber, which is then connected to an external return oil pipeline through the return oil port.

[0045] Specifically, the inner wall of the distributor body 12 is provided with several oil distribution grooves, and one end of the cylinder head is provided with several oil passages. The oil distribution grooves and oil passages are connected one-to-one. The oil distribution grooves are grooves or channels of a specific shape set on the inner wall of the distributor body 12. Their main function is to precisely guide and distribute the oil, ensuring that the oil is stably transferred from the distributor body 12 to the oil passages of the cylinder block 2. The oil distribution grooves can be designed as annular grooves evenly distributed along the circumference of the inner wall of the distributor body 12, or as grooves arranged axially or spirally, to adapt to different oil transfer requirements and rotational characteristics. Furthermore, the oil distribution grooves can also be multiple independent, radially arranged grooves, each corresponding to a specific oil passage, to achieve more precise oil control. The oil passages are holes or pipes set at one end of the cylinder head (i.e., the end opposite to the distributor body 12). Their function is to receive the oil from the oil distribution grooves and accurately guide it to the corresponding working chamber inside the cylinder block 2. The oil passage can be designed as a radially drilled hole, leading directly to the working chamber inside the cylinder block 2, or connected to an oil passage pre-cast or machined inside the cylinder head. To ensure the sealing of the connection, the inlet of the oil passage can be designed with a structure for installing a sealing ring.

[0046] The solution of this application constructs a precise and independent oil transmission path by setting several oil distribution grooves on the inner wall of the oil distributor body 12 and several oil passages at one end of the cylinder head, and connecting these oil distribution grooves and oil passages one-to-one. When the rotary cylinder is working, the oil distributor body 12, as a relatively stationary or moving component, has oil distribution grooves on its inner wall that can precisely guide the oil. At the same time, the cylinder head, as a component that rotates together with the piston assembly 3, has oil passages on it that can be precisely aligned or dynamically connected with the oil distribution grooves. This one-to-one correspondence structure design ensures that each independent working oil passage from the oil distributor body 12 to the inside of the cylinder 2 receives a stable and non-interfering oil supply. Compared to simply using generalized oil passage connections, this specific structure and correspondence between the oil distribution grooves and oil passages significantly improves the accuracy and sealing of oil distribution, effectively avoiding oil leakage and crossflow during rotation, thereby ensuring the reliable operation of multiple independent working oil passages of the rotary cylinder.

[0047] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0048] Furthermore, the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A water-injection / air-injection type rotary hydraulic cylinder, characterized in that, The rotary cylinder includes: an oil distributor, a cylinder body, and a piston assembly disposed inside the cylinder body; The oil separator includes an oil separator body and an oil separator end cap. The oil separator body and the oil separator end cap are provided with water injection and air injection channels. The piston rod is a pipe structure. The water injection and air injection channels of the oil separator are connected to the pipe of the piston rod to form the water inlet and air inlet channels of the rotary cylinder. The inner wall of the oil distributor body is provided with several oil distribution channels, and the cylinder body is provided with several oil passages. The oil distribution channels are connected one-to-one with the oil passages, forming several independent working oil circuits in the rotary cylinder.

2. The water-injection and air-injection type rotary cylinder according to claim 1, characterized in that, The oil separator end cap is provided with a water injection port and an air injection port.

3. The water-injection and air-injection type rotary cylinder according to claim 1, characterized in that, The cylinder block includes a cylinder block end cap and a cylinder block body, and the oil distributor is disposed on the outwardly extending end of the cylinder block end cap; The piston assembly includes a piston rod and a piston sleeved on the piston rod, the piston being located inside the cylinder body.

4. The water-injection and air-injection type rotary cylinder according to claim 3, characterized in that, A copper sleeve is provided between the oil separator end cap and the cylinder end cap; A flow divider hole is provided on one side of the copper sleeve.

5. The water-injection and air-injection type rotary cylinder according to claim 4, characterized in that, The distributor end cap is also provided with an oil seal, which is located at one end of the distributor end cap near the distributor body.

6. The water-injection and air-injection type rotary cylinder according to claim 4, characterized in that, The oil separator body is equipped with skeleton oil seals at both ends to prevent oil overflow.

7. The water-injection and air-injection type rotary cylinder according to claim 6, characterized in that, The oil separator body is also provided with two inclined return oil channels; One end of the oil return channel is located below the oil seal position of the oil distributor body, and the other end of the oil return channel is connected to the oil return port in the middle of the oil return body.

8. The water-injection and air-injection type rotary cylinder according to claim 6, characterized in that, The inner wall of the oil distributor body is provided with several oil distribution grooves, and one end of the cylinder head is provided with several oil passages. The oil distribution grooves and the oil passages are connected one-to-one.

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