Air cylinder and oil cylinder combined device with supporting ring and energy-saving type hydraulic station

Abstract

The utility model provides an air cylinder and oil cylinder combined device with a supporting ring and an energy-saving hydraulic station with the air cylinder and oil cylinder combined device. A piston rod mounting hole is formed in an air cylinder end cover of an air cylinder in the axial direction of the air cylinder end cover; a supporting clamping groove is formed in the periphery of the piston rod mounting hole in the air cylinder end cover, and a supporting ring is arranged in the supporting clamping groove. According to the utility model, the piston rod can slide through the piston rod mounting hole in the air cylinder end cover, so that the connection between the air cylinder piston in the air cylinder and the oil cylinder piston in the oil cylinder is realized; a supporting clamping groove is formed in the periphery of a piston rod mounting hole in the air cylinder end cover, and a supporting ring is clamped in the supporting clamping groove, so that the piston rod is rigidly supported, sliding abrasion of sliding of the piston rod to a sealing ring is reduced, and the sealing performance of the sealing ring between an air cylinder and an oil cylinder is improved; oil and gas mixing between the oil cylinder and the air cylinder is avoided, and therefore it is guaranteed that the oil cylinder can accurately output hydraulic pressure.

Description

Technical Field

[0001] The utility model relates to a hydraulic station, in particular to a combined device of a cylinder and an oil cylinder with a support ring and an energy-saving hydraulic station. Background Technique

[0002] A hydraulic station is a hydraulic device that supplies oil according to the required flow direction, pressure, and flow rate, and is usually used in conjunction with machine tools that require hydraulic drive actuators.

[0003] The utility model patent with the Chinese publication number CN219081986U discloses an energy-saving hydraulic station. As Figure 1 shown, it includes: an oil tank 1', a gas-liquid booster pump, and a solenoid valve group 6'; the liquid outlet of the oil tank 1' is communicated with the liquid inlet of the gas-liquid booster pump; the liquid outlet of the gas-liquid booster pump is communicated with the liquid inlet of the solenoid valve group 6'; the liquid return port of the solenoid valve group 6' is communicated with the liquid inlet of the oil tank 1'; the gas-liquid booster pump includes: a pneumatic cylinder 10' and an oil cylinder 11'; the pneumatic cylinder 10' and the oil cylinder 11' are communicated; a pneumatic piston in contact with the inner wall is arranged in the pneumatic cylinder 10', and an oil cylinder piston in contact with the inner wall is arranged in the oil cylinder 11'; the piston area of the pneumatic piston is larger than the piston area of the oil cylinder piston; it also includes a gas supply device, including: a gas source, a first air control valve 27', a second air control valve 28', and an air control reversing valve 29'; the first air control valve 27' is arranged on one side of the pneumatic cylinder 10, and the second air control valve 28 is arranged on the other side of the pneumatic cylinder 10'; the gas source is respectively connected to the air inlets of the first air control valve 27', the second air control valve 28', and the air control reversing valve 29'; the air control reversing valve 28' includes: an A' air outlet and a B' air outlet; the A' air outlet is communicated with one side of the pneumatic cylinder 10', and the B' air outlet is communicated with the other side of the pneumatic cylinder 10'; the first air control valve 27' is connected to the air control reversing valve 29' through a first gas source circuit 30' to control the air control reversing valve 29' to start the A' air outlet; the second air control valve 28' is connected to the air control reversing valve 29' through a second gas source circuit 31' to control the air control reversing valve 29' to start the B' air outlet.

[0004] In the factory use environment of the above energy-saving hydraulic station, the oil cylinder piston is generally used to cooperate with the cylinder barrel of the oil cylinder, and the cylinder barrel is filled with oil. The pneumatic piston and the oil cylinder piston are connected by a piston rod, and the oil cylinder piston is driven by the pneumatic piston to move reciprocally. Since the oil cylinder piston needs to be installed in the oil cylinder barrel to seal the oil, the sealing performance between the oil cylinder piston and the oil cylinder barrel is required to be very high. However, in the above energy-saving hydraulic station, during the movement of the piston rod, the sealing ring will be slid and worn, resulting in insufficient sealing between the oil cylinder and the air cylinder, causing the phenomenon of oil and gas intermixing between the oil cylinder and the air cylinder, resulting in the inability of the oil cylinder to accurately output hydraulic pressure, the loss of pressure of the tooling, and the problems of the workpiece not being clamped tightly and the tool hitting the workpiece. Summary of the Utility Model

[0005] The technical problem to be solved by the present utility model is to provide a combined device of a cylinder and an oil cylinder with a support ring and an energy-saving hydraulic station with the combined device of the cylinder and the oil cylinder.

[0006] To solve the above technical problem, the present utility model provides the following technical solutions:

[0007] On the one hand, the present utility model provides a combined device of a cylinder and an oil cylinder with a support ring. A piston rod mounting hole arranged along the axial direction is provided on the cylinder end cover of the cylinder for mounting a piston rod, so that the piston rod passes through the piston rod mounting hole in a slidable manner to realize the connection between the cylinder piston in the cylinder and the oil cylinder piston in the oil cylinder; a support clamping groove is provided on the cylinder end cover on the outer periphery of the piston rod mounting hole, and a support ring is arranged in the support clamping groove for rigidly supporting the piston rod to reduce the sliding wear of the sealing ring caused by the sliding of the piston rod.

[0008] Further, in the above combined device of the cylinder and the oil cylinder, the support ring is a hard support ring.

[0009] Further, in the above combined device of the cylinder and the oil cylinder, the support ring is a ring-shaped structure made of polytetrafluoroethylene material; or, the support ring is a copper support ring.

[0010] Further, in the above combined device of the cylinder and the oil cylinder, a sliding clearance fit is provided between the piston rod and the support ring; a sliding clearance fit is provided between the piston rod and the piston rod mounting hole, and the clearance between the piston rod and the inner wall of the piston rod mounting hole is 0.05 - 0.08 mm.

[0011] Further, in the above combined device of the cylinder and the oil cylinder, the support clamping groove is a U-shaped structure and is arranged circumferentially around the piston rod mounting hole in a full circle, so that the support ring can be clamped in the support clamping groove.

[0012] Further, in the above combined device of the cylinder and the oil cylinder, a seal mounting groove is further provided on the cylinder end cover on the outer periphery of the piston rod mounting hole, and sealing rings are arranged in the seal mounting grooves.

[0013] Further, in the above combined device of the cylinder and the oil cylinder, there is one seal mounting groove and one support clamping groove, and the seal mounting groove and the support clamping groove are respectively arranged on the end side of the cylinder end cover close to the inside of the cylinder and the end side of the cylinder end cover close to the outside of the cylinder.

[0014] Further, in the above-described cylinder and oil cylinder combination device, there is one each of the seal mounting groove and the support clamping groove, and the seal mounting groove and the support clamping groove are respectively disposed on the end side of the cylinder end cover close to the outside of the cylinder and on the end side of the cylinder end cover close to the inside of the cylinder.

[0015] Further, in the above-described cylinder and oil cylinder combination device, there is one support clamping groove and two seal mounting grooves, and the two seal mounting grooves are respectively disposed on both sides of the support clamping groove.

[0016] On the other hand, the present invention provides an energy-saving hydraulic station, which includes: a gas-liquid booster pump and a control valve group for controlling the commutation of the gas-liquid booster pump; the energy-saving hydraulic station includes the above-described cylinder and oil cylinder combination device having a support ring.

[0017] The cylinder and oil cylinder combination device with a support ring provided by the present invention and the energy-saving hydraulic station having the cylinder and oil cylinder combination device realize the connection between the cylinder piston in the cylinder and the oil cylinder piston in the oil cylinder through the piston rod mounting hole on the cylinder end cover for the sliding of the piston rod; through the support clamping groove provided on the outer periphery of the piston rod mounting hole on the cylinder end cover and the support ring clamped in the support clamping groove, the piston rod is rigidly supported to reduce the sliding wear of the sealing ring caused by the sliding of the piston rod, thereby improving the sealing performance between the cylinder and the oil cylinder by the sealing ring, avoiding the phenomenon of oil and gas intermixing between the oil cylinder and the cylinder, ensuring that the oil cylinder can accurately output hydraulic pressure, and then accurately executing through the hydraulic pressure, such as clamping a workpiece, and avoiding problems such as the workpiece not being clamped tightly and tool collision. Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 is a schematic structural diagram of an energy-saving hydraulic station in the prior art;

[0020] Figure 2 is a schematic structural diagram between the oil cylinder and the cylinder in the energy-saving hydraulic station provided by the first embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of the connection between the cylinder end cover and the piston rod provided by the first embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of the connection between the cylinder end cover and the piston rod provided by the second embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the structure at the connection between the cylinder end cover and the piston rod provided for the third embodiment of the present utility model;

[0024] Description of the reference numerals:

[0025] 1'- oil tank, 5'- filter, 6'- solenoid valve group, 7'- solenoid valve seat, 8'- output inlet and return oil pipe, 9'- silencer, 10'- pneumatic cylinder, 11'- oil cylinder, 26'- air source, 27'- first pneumatic control valve, 28'- second pneumatic control valve, 29'- pneumatic control reversing valve, 30'- first air source circuit, 31'- second air source circuit, 33'- return oil pipeline;

[0026] 1 - oil cylinder, 11 - oil cylinder piston, 111 - piston body, 2 - cylinder, 21 - cylinder piston, 22 - cylinder end cover, 221 - piston rod mounting hole, 222 - seal mounting groove, 223 - support clamping groove, 3 - piston rod, 4 - sealing ring, 5 - support ring. Detailed implementation manners

[0027] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] First embodiment:

[0029] Refer to Figure 2 , which is a schematic diagram of the structure of the energy-saving hydraulic station provided for the first embodiment of the present utility model. As shown in the figure, the gas-liquid booster pump of the energy-saving hydraulic station includes a linked oil cylinder 1 and a cylinder 2. A cylinder piston 21 in contact with the inner wall is provided in the cylinder 2, and an oil cylinder piston 11 in contact with the inner wall is provided in the oil cylinder 1. The cylinder piston 21 and the oil cylinder piston 11 are connected by a piston rod 3 to realize the linkage between the two.

[0030] Refer to Figure 2 and Figure 3 , which shows the preferred structure of the gas-liquid booster pump provided for the first embodiment of the present utility model. As shown in the figure, the gas-liquid booster pump includes a linked oil cylinder 1 and a cylinder 2. A cylinder piston 21 in contact with the inner wall is provided in the cylinder 2, and an oil cylinder piston 11 in contact with the inner wall is provided in the oil cylinder 1. The cylinder piston 21 and the oil cylinder piston 11 are connected by a piston rod 3 to realize the linkage between the two.

[0031] Specifically, an oil cylinder through hole is provided at the end of the oil cylinder 1 adjacent to the cylinder 2, and a piston rod mounting hole 221 arranged along its axial direction is provided on the cylinder end cover 22 of the cylinder 2 adjacent to the oil cylinder 1 (such as the cylinder end cover on the left side shown in Figure 2 ). The oil cylinder through hole and the piston rod mounting hole 221 are coaxially arranged and communicated with each other. The oil cylinder 1 and the cylinder 2 are communicated through the oil cylinder through hole and the piston rod mounting hole 221. The piston rod 3 passes through the oil cylinder through hole and the piston rod mounting hole 221 in a sealed sliding connection manner. Moreover, both ends of the piston rod 3 are fixedly connected to the oil cylinder piston 11 and the cylinder piston 21 respectively. In this embodiment, both ends of the piston rod 3 respectively penetrate through the oil cylinder piston 11 and the cylinder piston 21, and are connected and fixed to the oil cylinder piston 11 and the cylinder piston 21 through connecting parts such as nuts. In this embodiment, the gas-liquid booster pump is a single oil cylinder, and it can also be a double oil cylinder. No limitation is made to it in this embodiment. In this embodiment, the piston area of the cylinder piston 21 is larger than the piston area of the oil cylinder piston 11. In particular, the piston area of the cylinder piston 21 can be several times larger than the piston area of the oil cylinder piston 11, so as to facilitate the calculation of pressure. For example, if the piston area of the cylinder piston 21 is 6 times the piston area of the oil cylinder piston 11, when the cylinder 2 outputs a pressure of 1 bar, the oil cylinder 1 outputs a pressure of 6 bar. Among them, the piston rod mounting hole 221 is a through hole structure arranged along the axial direction of the cylinder 2. Figure 2 The arrow direction in

[0032] refers to the oil flow direction in the one-way valves on both sides of the oil cylinder, that is, the oil inlet and outlet direction.

[0033] Certainly, in other embodiments, the end of the oil cylinder 1 and the cylinder 2 can also share a single end cover, such as the cylinder end cover. The piston rod 3 can slidably penetrate through the piston rod mounting hole 221, and both ends respectively extend into the interior of the oil cylinder 1 and the interior of the cylinder 2.

[0034] Continue to refer to Figure 2 and Figure 3 . A sealing ring 4 can also be provided on the cylinder end cover 22 on the outer periphery of the piston rod mounting hole 221 on the side close to the inside of the cylinder 2 for sealing. Specifically, on the cylinder block 22, on the outer periphery of the piston rod mounting hole 221 on the side close to the inside of the cylinder 2 (such as Figure 3On the right side (as shown), a sealing installation groove 222 is also provided. The sealing ring 4 can be arranged in the sealing installation groove 222 to seal the cylinder 2, preventing the mutual leakage of oil and gas between the cylinder 2 and the oil cylinder 1, that is, preventing the oil in the oil cylinder 1 from flowing into the cylinder 2 and also preventing the gas in the cylinder 2 from flowing into the oil cylinder 1, which can ensure the stability of the operation of the oil cylinder 1 and the cylinder 2. Among them, the sealing installation groove 222 can be of a U-shaped structure and arranged circumferentially around the piston rod installation hole 221, and is also connected to the piston rod installation hole 221 to facilitate the installation of the sealing ring 4. In this embodiment, the sealing ring 4 can be an O-ring.

[0035] Continue to refer to Figure 2 The cylinder end cover 22 is also provided with a support and fixation groove 223 on the outer periphery of the piston rod installation hole 221. A support ring 5 is arranged in the support and fixation groove 223 to provide rigid support for the piston rod, reducing the sliding wear of the sealing ring caused by the sliding of the piston rod, and achieving hard protection for the sealing ring.

[0036] Specifically, on the outer periphery of the piston rod installation hole 221 of the cylinder end cover 22, on the side far from the inner cavity of the cylinder 2 (such as Figure 2 the left side as shown), a support and fixation groove 223 is also provided, that is, the support and fixation groove 223 is arranged on the side closer to the outside of the cylinder 2 (such as Figure 2 the left side as shown). The support ring 5 is clamped in the support and fixation groove 223, with its outer wall abutted against the cylinder end cover 22, that is, on the wall surface of the support and fixation groove 223 of the cylinder end cover 22, and its inner wall is used to abut against the outer wall of the piston rod 3 to provide rigid support for the sliding of the piston rod 3, thereby avoiding the sliding extrusion wear of the sealing ring 4 when the piston rod 3 slides and achieving hard protection for the sealing ring. That is to say, there is one sealing installation groove 222 and one support and fixation groove 223 respectively. And the sealing installation groove 222 and the support and fixation groove 223 are respectively located on the end side of the cylinder end cover 22 close to the inside of the cylinder 2 (such as Figure 3 the right end side as shown) and the end side of the cylinder end cover 22 close to the outside of the cylinder 2 (such as Figure 3 the left end side as shown). At the same time, there is one sealing ring 4 and one support ring 5 respectively. And the sealing ring 4 and the support ring 5 are respectively located on the end side of the cylinder end cover 22 close to the inside of the cylinder 2 (such as Figure 3 the right end side as shown) and the end side of the cylinder end cover 22 close to the outside of the cylinder 2 (such as Figure 3 the left end side as shown). Among them, the support and fixation groove 223 can be of a U-shaped structure and arranged circumferentially around the piston rod installation hole 221, and is also connected to the piston rod installation hole 221 to enable the support ring 5 to be clamped in the support and fixation groove 223, facilitating the installation of the support ring 5; the support ring 5 is of a ring structure, which is arranged in the support and fixation groove 223, and its inner wall can abut against the outer wall of the piston rod 3.

[0037] In this embodiment, a sliding clearance fit is provided between the piston rod 3 and the support ring 5, so as to rigidly support the sliding of the piston rod 3 through the support ring 5, and avoid the sliding extrusion wear of the elastic sealing ring 4 by the piston rod 3.

[0038] In this embodiment, the support ring 5 has a hard ring structure to achieve rigid support with a certain hardness; in this embodiment, the support ring 5 can be made of polytetrafluoroethylene material, has a certain hardness, good self-lubricity and wear resistance; of course, it can also be made of other hard materials, such as copper and other materials, that is, a copper support ring, and no limitation is made thereto in this embodiment.

[0039] In this embodiment, the cross-section of the support ring 5 can be a square structure, or can be other shapes such as a tapered structure with a wider outer width and a narrower inner width, and no limitation is made thereto in this embodiment.

[0040] Second Embodiment:

[0041] The difference between the energy-saving hydraulic station and cylinder provided in the second embodiment and the energy-saving hydraulic station and cylinder provided in the first embodiment lies in that: the relative positions between the seal mounting groove 222 and the support clamping groove 223 are different, that is, the relative positions of the support ring 5 and the sealing ring 4 are different, and the positional relationships, connection relationships, structures and materials of other components are the same as those in the first embodiment.

[0042] See Figure 4 , which shows a schematic structural diagram of the connection between the cylinder head and the piston rod provided in the second embodiment of the present invention. As shown in the figure, on the outer periphery of the piston rod mounting hole 221 of the cylinder head 22, on the side away from the inside of the cylinder 2 (such as Figure 4 the left side shown), a seal mounting groove 222 can be provided, and a sealing ring 4 can be provided in the seal mounting groove 222 for sealing. On the outer periphery of the piston rod mounting hole 221 of the cylinder head 22, on the side close to the inner cavity of the cylinder 2 (such as Figure 4 the right side shown), a support clamping groove 223 is further provided, that is, the support clamping groove 223 is provided on the side close to the inside of the cylinder 2 (such as Figure 4 the right side shown), and the support ring 5 is clamped in the support clamping groove 223. That is to say, there is one seal mounting groove 222 and one support clamping groove 223, and the seal mounting groove 222 and the support clamping groove 223 are respectively located on the end side of the cylinder head 22 close to the outside of the cylinder 2 (such as Figure 4 the left end side shown), the end side of the cylinder head 22 close to the inside of the cylinder 2 (such as Figure 4 the right end side shown). At the same time, there is one sealing ring 4 and one support ring 5, and the sealing ring 4 and the support ring 5 are respectively located on the end side of the cylinder head 22 close to the inside of the cylinder 2 (such as Figure 4 the left end side shown), the end side of the cylinder head 22 close to the outside of the cylinder 2 (such as Figure 4the right end side shown).

[0043] Third Embodiment:

[0044] The difference between the energy-saving hydraulic station and cylinder provided in the third embodiment and the energy-saving hydraulic station and cylinder provided in the first embodiment lies in that: the number of the sealing installation grooves 222 and the relative positions between the sealing installation grooves 222 and the support clamping grooves 223 are different, that is, the number of the sealing rings 4 and the relative positions between the support rings 5 and the sealing rings 4 are different, and the positional relationships, connection relationships, structures and materials of other components are the same as those in the first embodiment.

[0045] Refer to Figure 5 , which shows a schematic structural diagram of the connection between the cylinder head of the cylinder provided in the third embodiment of the present invention and the piston rod. As shown in the figure, sealing installation grooves 222 can be provided on the outer peripheries of both end sides of the cylinder head 22 around the piston rod installation hole 221, that is, two sealing installation grooves 222 are provided, and sealing rings 4 can be provided in both of the two sealing installation grooves 222 for sealing. A support clamping groove 223 can also be provided on the cylinder head 22 around the piston rod installation hole 221 between the two sealing installation grooves 222, and the support ring 5 is clamped in the support clamping groove 223. That is to say, there are two sealing installation grooves 222, one support clamping groove 223, the sealing installation grooves 222 are respectively arranged on both sides of the support clamping groove 221, at the same time, there are two sealing rings 4 and one support ring 5, and the two sealing rings 4 are respectively arranged on both sides of the support ring 5.

[0046] In summary, for the cylinder and oil cylinder combination device with a support ring provided in each embodiment of the present invention and the energy-saving hydraulic station with the cylinder and oil cylinder combination device, through the piston rod installation hole on the cylinder head to allow the sliding of the piston rod, thereby realizing the connection between the cylinder piston in the cylinder and the oil cylinder piston in the oil cylinder; through the support clamping groove provided on the outer periphery of the piston rod installation hole on the cylinder head and the support ring clamped in the support clamping groove, the piston rod is rigidly supported to reduce the sliding wear of the sealing ring caused by the sliding of the piston rod, thereby improving the sealing performance between the cylinder and the oil cylinder by the sealing ring, avoiding the phenomenon of oil and gas intermixing between the oil cylinder and the cylinder, so as to ensure that the oil cylinder can accurately output hydraulic pressure, and then accurately execute through the hydraulic pressure, for example, clamping a workpiece, which can avoid problems such as the workpiece not being clamped tightly and tool hitting.

[0047] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0048] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. A combination of an air cylinder and an oil cylinder with a support ring, characterized in that: The cylinder end cover of the cylinder is provided with a piston rod mounting hole arranged along the axial direction thereof, for mounting the piston rod, so that the piston rod can be slidably inserted into the piston rod mounting hole to achieve connection between the cylinder piston in the cylinder and the oil cylinder piston in the oil cylinder; The cylinder end cover is provided with a supporting clamping groove on the outer periphery of the piston rod mounting hole, and a supporting ring is provided in the supporting clamping groove for rigidly supporting the piston rod to reduce the sliding wear of the sealing ring caused by the sliding of the piston rod.

2. A gas cylinder and oil cylinder combination device according to claim 1, characterized in that: The support ring is a hard support ring.

3. A gas cylinder and oil cylinder combination device according to claim 2, characterized in that: The support ring is a ring-shaped structure made of polytetrafluoroethylene material; or, the support ring is a copper support ring.

4. A gas cylinder and oil cylinder combination device according to any one of claims 1 to 3, characterized in that: The piston rod and the support ring are fitted with a sliding clearance; The piston rod and the piston rod mounting hole have a sliding clearance fit, and the clearance between the piston rod and the inner wall of the piston rod mounting hole is 0.05-0.08 mm.

5. A gas cylinder and oil cylinder combination device according to any one of claims 1 to 3, characterized in that: The support clamping groove is a U-shaped structure and is arranged along the entire circumference of the piston rod mounting hole, so that the support ring can be clamped in the support clamping groove.

6. A gas cylinder and oil cylinder combination device according to any one of claims 1 to 3, characterized in that: The cylinder end cover is also provided with a sealing installation groove on the outer periphery of the piston rod installation hole, and a sealing ring is provided in the sealing installation groove.

7. A gas cylinder and oil cylinder combination device according to claim 6, characterized in that: The sealing installation groove and the supporting fixing groove are both one, and the sealing installation groove and the supporting fixing groove are respectively arranged on the end side of the cylinder end cover close to the inside of the cylinder and the end side of the cylinder end cover close to the outside of the cylinder.

8. The air cylinder and oil cylinder combination device according to claim 6, characterized in that: The sealing installation groove and the supporting fixing groove are both one, and the sealing installation groove and the supporting fixing groove are respectively disposed on the end side of the cylinder end cover close to the outside of the cylinder and the end side of the cylinder end cover close to the inside of the cylinder.

9. The air cylinder and oil cylinder combination device according to claim 6, characterized in that: There is one supporting fixing groove and two sealing installation grooves, and the two sealing installation grooves are respectively arranged on both sides of the supporting fixing groove.

10. An energy-saving hydraulic station, comprising: A gas-liquid booster pump and a control valve group for controlling the reversing of the gas-liquid booster pump; characterized in that the gas-liquid booster pump comprises a gas cylinder and oil cylinder combination device with a support ring as described in any one of claims 1 to 9.

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