Hydraulic cylinder

Abstract

An embodiment of the present invention provides a hydraulic cylinder, which includes: two cylinder barrels and a piston rod. Wherein, both ends of the piston rod extend into the interiors of the two cylinder barrels respectively, and the two cylinder barrels can expand and contract simultaneously or independently along the axial direction of the piston rod. Through this structural arrangement, two cylinder barrels are sleeved on the same piston rod. When one of the cylinder barrels extends independently, the hydraulic cylinder has the output force of a single cylinder barrel. When the two cylinder barrels extend simultaneously, the hydraulic cylinder has the output force of the superposition of two cylinder barrels. Compared with the prior art, by adding cylinder barrels and enabling each cylinder barrel to expand and contract independently or simultaneously, the hydraulic cylinder realizes an increase in the thrust of the hydraulic cylinder. Thus, there is no need to separately add a hydraulic cylinder, which can greatly reduce the component cost. At the same time, it can also reduce the occupied space of multiple hydraulic cylinders.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic components, and particularly to a hydraulic cylinder. Background Art

[0002] A hydraulic cylinder is an important actuator in a hydraulic system. The hydraulic cylinder can convert hydraulic energy into mechanical energy and cooperate with various transmission mechanisms to complete various mechanical movements. The hydraulic cylinder has the characteristics of simple structure, large output force, stable and reliable performance, etc.

[0003] In the hydraulic cylinders used in the prior art, the cylinder barrel is usually of an integral structure. The thrust of the piston rod is fixed. If it is necessary to increase the thrust, additional hydraulic cylinders need to be installed, which results in an increase in cost. At the same time, it is not convenient to install two hydraulic cylinders simultaneously in a limited space area. Summary of the Invention

[0004] The present invention provides a hydraulic cylinder to solve the problems in the prior art that to increase the thrust of the hydraulic cylinder, the number of hydraulic cylinders needs to be increased accordingly, resulting in increased cost and large space occupied by the hydraulic cylinders. The present invention realizes the effect of increasing the thrust of the hydraulic cylinder while ensuring the number of hydraulic cylinders remains unchanged, reducing the cost and reducing the space occupied by the hydraulic cylinder.

[0005] A hydraulic cylinder according to the present invention includes: two cylinder barrels and a piston rod.

[0006] Wherein, both ends of the piston rod extend into the interiors of the two cylinder barrels, and the two cylinder barrels can simultaneously expand and contract or independently expand and contract along the axial direction of the piston rod.

[0007] A hydraulic cylinder according to the present invention, the two cylinder barrels are respectively a first cylinder barrel and a second cylinder barrel, and the hydraulic cylinder further includes a first piston and a second piston.

[0008] Wherein, one end of the piston rod extends into the first cylinder barrel, and the first piston is installed at the end of the piston rod located inside the first cylinder barrel. The other end of the piston rod extends into the second cylinder barrel, and the second piston is installed at the end of the piston rod located inside the second cylinder barrel.

[0009] Wherein, a first guide sleeve is installed at the end of the first cylinder barrel away from the first piston, and a second guide sleeve is installed at the end of the second cylinder barrel away from the second piston.

[0010] A hydraulic cylinder according to the present invention, a first rod chamber and a first rodless chamber are formed inside the first cylinder barrel, and a second rod chamber and a second rodless chamber are formed inside the second cylinder barrel.

[0011] Wherein, a first oil port and a second oil port are provided on the first cylinder barrel. The first oil port is communicated with the first rodless cavity, and the first rodless cavity is communicated with the second rod cavity, and the second oil port is communicated with the first rod cavity.

[0012] Wherein, a third oil port is provided on the second cylinder barrel, and the third oil port is communicated with the second rodless cavity.

[0013] According to a hydraulic cylinder provided by the present invention, a tubing is installed inside the piston rod. One end of the tubing is communicated with the first rodless cavity, and an oil passing hole is provided at the other end of the tubing, and the oil passing hole is communicated with the second rod cavity.

[0014] According to a hydraulic cylinder provided by the present invention, a protective cover is installed between the first cylinder barrel and the second cylinder barrel, and the protective cover can expand and contract along with the movement of the first cylinder barrel and the second cylinder barrel.

[0015] According to a hydraulic cylinder provided by the present invention, both between the first cylinder barrel and the protective cover and between the second cylinder barrel and the protective cover are connected by clamps.

[0016] According to a hydraulic cylinder provided by the present invention, spherical plain bearings are installed at the outer ends of both the first cylinder barrel and the second cylinder barrel.

[0017] According to a hydraulic cylinder provided by the present invention, dust rings are installed at the outer ends of both the first guide sleeve and the second guide sleeve.

[0018] According to a hydraulic cylinder provided by the present invention, dynamic sealing devices are installed between the first piston and the first cylinder barrel, between the piston rod and the first guide sleeve, between the second piston and the second cylinder barrel, and between the piston rod and the second guide sleeve.

[0019] According to a hydraulic cylinder provided by the present invention, static sealing devices are installed between the first piston and the piston rod, between the first guide sleeve and the first cylinder barrel, between the second piston and the piston rod, and between the second guide sleeve and the second cylinder barrel.

[0020] In the hydraulic cylinder provided by the present invention, both ends of the piston rod respectively extend into the interiors of the two cylinder barrels, and the two cylinder barrels can simultaneously expand and contract or independently expand and contract along the axial direction of the piston rod.

[0021] With this structural arrangement, two cylinder barrels are sleeved on the same piston rod. When one of the cylinder barrels extends independently, the hydraulic cylinder has the output force of a single cylinder barrel. When the two cylinder barrels extend simultaneously, the hydraulic cylinder has the output force of the superposition of two cylinder barrels. Compared with the prior art, this hydraulic cylinder increases the thrust of the hydraulic cylinder by adding cylinder barrels and enabling each cylinder barrel to extend and retract independently or simultaneously. Thus, there is no need to separately add a hydraulic cylinder, which can greatly reduce the component cost. At the same time, it can also reduce the occupied space of multiple hydraulic cylinders. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the external structure of the hydraulic cylinder provided by the present invention;

[0024] Figure 2 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 1 ;

[0025] Figure 3 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 2 ;

[0026] Figure 4 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 3 ;

[0027] Figure 5 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 4 ;

[0028] Figure 6 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 5 ;

[0029] Figure 7 is a schematic diagram of the internal structure of the hydraulic cylinder provided by the present invention Figure 6 ;

[0030] Reference Signs:

[0031] 100: First Cylinder Barrel; 101: First Guide Sleeve; 102: First Piston;

[0032] 103: First Rod Chamber; 104: First Rodless Chamber; 105: First Oil Port;

[0033] 106: Second oil port; 200: Second cylinder barrel; 201: Second guide sleeve;

[0034] 202: Second piston; 203: Second rod chamber; 204: Second rodless chamber;

[0035] 205: Third oil port; 300: Piston rod; 301: Oil pipe;

[0036] 302: Oil through hole; 400: Protective cover; 401: Clamp;

[0037] 500: Spherical plain bearing. Specific embodiments

[0038] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0039] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention 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 understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "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. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0041] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] Next, in conjunction with Figures 1 to 7 a hydraulic cylinder provided by an embodiment of the present invention will be described. It should be understood that the following is only a schematic implementation manner of the present invention and does not constitute any special limitation to the present invention.

[0044] An embodiment of the present invention provides a hydraulic cylinder, as Figures 1 to 7 shown, the hydraulic cylinder includes: two cylinder barrels and a piston rod 300.

[0045] Wherein, both ends of the piston rod 300 extend into the interiors of the two cylinder barrels, and the two cylinder barrels can simultaneously expand and contract or independently expand and contract along the axial direction of the piston rod 300.

[0046] With this structural arrangement, two cylinder barrels are sleeved on the same piston rod 300. When one of the cylinder barrels independently extends, the hydraulic cylinder has the output force of a single cylinder barrel. When the two cylinder barrels extend simultaneously, the hydraulic cylinder has the output force of the superposition of two cylinder barrels. Compared with the prior art, this hydraulic cylinder realizes an increase in the thrust of the hydraulic cylinder by adding cylinder barrels and enabling each cylinder barrel to independently or simultaneously expand and contract. Thus, there is no need to separately add a hydraulic cylinder, which can greatly reduce the component cost. At the same time, it can also reduce the occupied space of multiple hydraulic cylinders.

[0047] In one embodiment of the present invention, the two cylinder barrels are respectively a first cylinder barrel 100 and a second cylinder barrel 200. The hydraulic cylinder further includes a first piston 102 and a second piston 202.

[0048] One end of the piston rod 300 extends into the first cylinder 100, and a first piston 102 is installed at the end of the piston rod 300 located inside the first cylinder 100. The other end of the piston rod 300 extends into the second cylinder 200, and a second piston 202 is installed at the end of the piston rod 300 located inside the second cylinder 200.

[0049] A first guide sleeve 101 is installed at the end of the first cylinder 100 away from the first piston 102. A second guide sleeve 201 is installed at the end of the second cylinder 200 away from the second piston 202.

[0050] For example, as Figures 2 to 7 shown, the hydraulic cylinder includes a first cylinder 100, a second cylinder 200, a first piston 102, a second piston 202, and a piston rod 300.

[0051] The first cylinder 100 is located at the left end, and the second cylinder 200 is located at the right end. Specifically, the left end of the piston rod 300 extends into the interior of the first cylinder 100, and a first piston 102 is installed at the left end of the piston rod 300. The right end of the piston rod 300 extends into the interior of the second cylinder 200, and a second piston 202 is installed at the right end of the piston rod 300. At the right end of the first cylinder 100, a first guide sleeve 101 is installed between the first cylinder 100 and the piston rod 300; at the left end of the second cylinder 200, a second guide sleeve 201 is installed between the second cylinder 200 and the piston rod 300.

[0052] Moreover, the first cylinder 100 and the second cylinder 200 can expand and contract simultaneously or independently along the axial direction of the piston rod 300.

[0053] Furthermore, in an embodiment of the present invention, dust-proof rings are installed at the outer ends of the first guide sleeve 101 and the second guide sleeve 201.

[0054] Even further, in an embodiment of the present invention, dynamic sealing devices are installed between the first piston 102 and the first cylinder 100, between the piston rod 300 and the first guide sleeve 101, between the second piston 202 and the second cylinder 200, and between the piston rod 300 and the second guide sleeve 201.

[0055] In addition, in an embodiment of the present invention, static sealing devices are installed between the first piston 102 and the piston rod 300, between the first guide sleeve 101 and the first cylinder 100, between the second piston 202 and the piston rod 300, and between the second guide sleeve 201 and the second cylinder 200.

[0056] Specifically, the hydraulic cylinder includes a first cylinder 100, a second cylinder 200, a first piston 102, a second piston 202, and a piston rod 300.

[0057] Among them, the first cylinder 100 is located at the left end, and the second cylinder 200 is located at the right end. Specifically, the left end of the piston rod 300 extends into the interior of the first cylinder 100, and a first piston 102 is installed at the left end of the piston rod 300. The right end of the piston rod 300 extends into the interior of the second cylinder 200, and a second piston 202 is installed at the right end of the piston rod 300.

[0058] At the right end of the first cylinder 100, a first guide sleeve 101 is installed between the first cylinder 100 and the piston rod 300; at the left end of the second cylinder 200, a second guide sleeve 201 is installed between the second cylinder 200 and the piston rod 300. And dust-proof rings are installed at the outer ends of the first guide sleeve 101 and the second guide sleeve 201.

[0059] The first cylinder 100 and the second cylinder 200 can expand and contract simultaneously or independently along the axial direction of the piston rod 300.

[0060] At the same time, dynamic sealing devices are installed between the first piston 102 and the first cylinder 100, between the piston rod 300 and the first guide sleeve 101, between the second piston 202 and the second cylinder 200, and between the piston rod 300 and the second guide sleeve 201. For example, the dynamic sealing device is a Gleitring. Static sealing devices are installed between the first piston 102 and the piston rod 300, between the first guide sleeve 101 and the first cylinder 100, between the second piston 202 and the piston rod 300, and between the second guide sleeve 201 and the second cylinder 200. For example, the static sealing device is an O-ring.

[0061] It should be understood here that for the specific dimensions and types of the dust-proof rings, dynamic sealing devices, and static sealing devices, the present invention does not make any specific limitations. Workers can adjust the specific dimensions and types of the dust-proof rings, dynamic sealing devices, and static sealing devices according to specific working conditions.

[0062] According to the embodiments described above, by installing dust-proof rings at the outer ends of the first guide sleeve 101 and the second guide sleeve 201, it is possible to effectively prevent external impurities from invading the hydraulic cylinder through the gaps between the first guide sleeve 101 and the piston rod 300, and between the second guide sleeve 201 and the piston rod 300, causing damage to the hydraulic cylinder.

[0063] In addition, dynamic sealing devices are installed between the first piston 102 and the first cylinder barrel 100, between the piston rod 300 and the first guide sleeve 101, between the second piston 202 and the second cylinder barrel 200, and between the piston rod 300 and the second guide sleeve 201. Static sealing devices are installed between the first piston 102 and the piston rod 300, between the first guide sleeve 101 and the first cylinder barrel 100, between the second piston 202 and the piston rod 300, and between the second guide sleeve 201 and the second cylinder barrel 200, which can effectively ensure the sealing performance of the hydraulic cylinder and improve the working precision of the hydraulic cylinder.

[0064] In an embodiment of the present invention, a first rod chamber 103 and a first rodless chamber 104 are formed inside the first cylinder barrel 100. A second rod chamber 203 and a second rodless chamber 204 are formed inside the second cylinder barrel 200.

[0065] Wherein, a first oil port 105 and a second oil port 106 are provided on the first cylinder barrel 100. The first oil port 105 is communicated with the first rodless chamber 104, and the first rodless chamber 104 is communicated with the second rod chamber 203. The second oil port 106 is communicated with the first rod chamber 103.

[0066] Wherein, a third oil port 205 is provided on the second cylinder barrel 200. The third oil port 205 is communicated with the second rodless chamber 204.

[0067] Furthermore, in an embodiment of the present invention, an oil pipe 301 is installed inside the piston rod 300. One end of the oil pipe 301 is communicated with the first rodless chamber 104. An oil passing hole 302 is provided at the other end of the oil pipe 301. The oil passing hole 302 is communicated with the second rod chamber 203.

[0068] For example, as Figures 1 to 7 shown, a first rod chamber 103 and a first rodless chamber 104 are formed inside the first cylinder barrel 100. A second rod chamber 203 and a second rodless chamber 204 are formed inside the second cylinder barrel 200. Specifically, the left cavity of the first piston 102 is the first rodless chamber 104, and the right cavity of the first piston 102 is the first rod chamber 103. The left cavity of the second piston 202 is the second rod chamber 203, and the right cavity of the second piston 202 is the second rodless chamber 204.

[0069] A first oil port 105 and a second oil port 106 are formed on the first cylinder barrel 100. Among them, the first oil port 105 communicates with the first rodless cavity 104, and the second oil port 106 communicates with the first rod cavity 103. A third oil port 205 is formed on the second cylinder barrel 200, and the third oil port 205 communicates with the second rodless cavity 204. And, an oil pipe 301 is installed on the central axis of the piston rod 300. The left end of the oil pipe 301 communicates with the first rodless cavity 104, and an oil passing hole 302 is formed at the right end of the oil pipe 301. The oil pipe 301 and the second rod cavity 203 are interconnected through the oil passing hole 302. That is, the first rodless cavity 104 is communicated with the second rod cavity 203 through the oil pipe 301.

[0070] Figure 2 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the first oil port 105 in an exposed state. In this figure, no hydraulic oil is filled in the first rodless cavity 104;

[0071] Figure 3 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the first oil port 105 in an exposed state. In this figure, part of the hydraulic oil is filled in the first rodless cavity 104;

[0072] Figure 4 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the second oil port 106 in an exposed state. In this figure, no hydraulic oil is filled in the first rodless cavity 104;

[0073] Figure 5 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the second oil port 106 in an exposed state. In this figure, part of the hydraulic oil is filled in the first rodless cavity 104;

[0074] Figure 6 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the third oil port 205 in an exposed state. In this figure, no hydraulic oil is filled in the second rodless cavity 204;

[0075] Figure 7 The figure shows a schematic cross-sectional structure diagram of a hydraulic cylinder with the third oil port 205 in an exposed state. In this figure, part of the hydraulic oil is filled in the second rodless cavity 204.

[0076] As Figure 2 、 Figure 4 and Figure 6 shown, in the initial state, the first piston 102 is closely attached to the left end of the first cylinder barrel 100, and the second piston 202 is closely attached to the right end of the second cylinder barrel 200.

[0077] As Figure 3 and Figure 5As shown, when injecting oil into the first oil port 105, the hydraulic oil enters the first rodless cavity 104 from the first oil port 105. At the same time, the hydraulic oil in the first rod cavity 103 flows back to the second oil port 106 to drive the first cylinder barrel 100 to quickly extend to the left. At the same time, a part of the hydraulic oil in the first rod cavity 103 can flow through the oil pipe 301 and the oil through hole 302 in the piston rod 300 and flow smoothly into the second rod cavity 203. At this time, the second cylinder barrel 200 remains in the original state and does not move. Thus, the independent telescopic movement of the first cylinder barrel 100 can be completed.

[0078] As Figure 7 shown, when injecting oil into the third oil port 205, the hydraulic oil enters the second rodless cavity 204 from the third oil port 205 to drive the second cylinder barrel 200 to extend to the right. At the same time, the hydraulic oil in the second rod cavity 203 can flow smoothly into the first rodless cavity 104 through the oil through hole 302 and the oil pipe 301. At this time, it will drive the first cylinder barrel 100 to extend to the left. Thus, the simultaneous telescopic movement of the first cylinder barrel 100 and the second cylinder barrel 200 can be completed. At this time, the thrust of the hydraulic cylinder increases accordingly.

[0079] In an embodiment of the present invention, a protective cover 400 is installed between the first cylinder barrel 100 and the second cylinder barrel 200. The protective cover 400 can expand and contract as the first cylinder barrel 100 and the second cylinder barrel 200 move.

[0080] Furthermore, in an embodiment of the present invention, both between the first cylinder barrel 100 and the protective cover 400 and between the second cylinder barrel 200 and the protective cover 400 are connected by a clamp 401.

[0081] According to the embodiments described above, by installing the protective cover 400 between the first cylinder barrel 100 and the second cylinder barrel 200, the first cylinder barrel 100 and the second cylinder barrel 200 can be effectively protected, thereby extending the service life of the hydraulic cylinder. At the same time, by connecting the protective cover 400 to the first cylinder barrel 100 and the second cylinder barrel 200 through the clamp 401, the disassembly, assembly and maintenance work can be carried out more conveniently.

[0082] It should be noted here that the above embodiments are only a schematic embodiment of the present invention and do not constitute any limitation to the present invention. That is to say, the connection manner between the protective cover 400 and the first cylinder barrel 100 and the second cylinder barrel 200 includes but is not limited to clamp connection.

[0083] In an embodiment of the present invention, spherical plain bearings 500 are installed at the outer ends of both the first cylinder barrel 100 and the second cylinder barrel 200.

[0084] Specifically, as Figures 1 to 7As shown in the figure, the hydraulic cylinder includes a first cylinder barrel 100, a second cylinder barrel 200, a first piston 102, a second piston 202, and a piston rod 300.

[0085] Among them, the first cylinder barrel 100 is located at the left end, and the second cylinder barrel 200 is located at the right end. Specifically, the left end of the piston rod 300 extends into the interior of the first cylinder barrel 100, and a first piston 102 is installed at the left end of the piston rod 300. The right end of the piston rod 300 extends into the interior of the second cylinder barrel 200, and a second piston 202 is installed at the right end of the piston rod 300.

[0086] A protective cover 400 is connected between the first cylinder barrel 100 and the second cylinder barrel 200 by a clamp 401. The protective cover 400 can expand and contract with the movement of the first cylinder barrel 100 and the second cylinder barrel 200. Joint bearings 500 are installed at the outer ends of both the first cylinder barrel 100 and the second cylinder barrel 200.

[0087] At the right end of the first cylinder barrel 100, a first guide sleeve 101 is installed between the first cylinder barrel 100 and the piston rod 300; at the left end of the second cylinder barrel 200, a second guide sleeve 201 is installed between the second cylinder barrel 200 and the piston rod 300. And dust rings are installed at the outer ends of both the first guide sleeve 101 and the second guide sleeve 201.

[0088] Dynamic sealing devices are installed between the first piston 102 and the first cylinder barrel 100, between the piston rod 300 and the first guide sleeve 101, between the second piston 202 and the second cylinder barrel 200, and between the piston rod 300 and the second guide sleeve 201. For example, the dynamic sealing device is a Gleitring. Static sealing devices are installed between the first piston 102 and the piston rod 300, between the first guide sleeve 101 and the first cylinder barrel 100, between the second piston 202 and the piston rod 300, and between the second guide sleeve 201 and the second cylinder barrel 200. For example, the static sealing device is an O-ring.

[0089] A first rod chamber 103 and a first rodless chamber 104 are formed inside the first cylinder barrel 100. A second rod chamber 203 and a second rodless chamber 204 are formed inside the second cylinder barrel 200. Specifically, the left side cavity of the first piston 102 is the first rodless chamber 104, and the right side cavity of the first piston 102 is the first rod chamber 103. The left side cavity of the second piston 202 is the second rod chamber 203, and the right side cavity of the second piston 202 is the second rodless chamber 204.

[0090] A first oil port 105 and a second oil port 106 are formed on the first cylinder barrel 100. Among them, the first oil port 105 communicates with the first rodless cavity 104, and the second oil port 106 communicates with the first rod cavity 103. A third oil port 205 is formed on the second cylinder barrel 200, and the third oil port 205 communicates with the second rodless cavity 204. And, an oil pipe 301 is installed on the central axis of the piston rod 300. The left end of the oil pipe 301 communicates with the first rodless cavity 104, and an oil passing hole 302 is formed at the right end of the oil pipe 301. The oil pipe 301 is communicated with the second rod cavity 203 through the oil passing hole 302. That is, the first rodless cavity 104 is communicated with the second rod cavity 203 through the oil pipe 301.

[0091] Through this structural arrangement, when oil is injected into the first oil port 105, the first cylinder barrel 100 can be extended independently. When oil is injected into the third oil port 205, the first cylinder barrel 100 and the second cylinder barrel 200 can be extended simultaneously. At this time, the thrust of the hydraulic cylinder increases accordingly. Thus, the hydraulic cylinder realizes an increase in the thrust of the hydraulic cylinder by adding cylinder barrels and making each cylinder barrel extend and retract independently or simultaneously. Thus, there is no need to separately add a hydraulic cylinder, which can greatly reduce the component cost. At the same time, the occupied space of multiple hydraulic cylinders can also be reduced.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention 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 described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic cylinder, characterized in that, Comprising: Two cylinder barrels and a piston rod, Wherein, both ends of the piston rod respectively extend into the interiors of the two cylinder barrels, and the two cylinder barrels can simultaneously expand and contract or independently expand and contract along the axial direction of the piston rod; The two cylinder barrels are respectively a first cylinder barrel and a second cylinder barrel, and the hydraulic cylinder further comprises a first piston and a second piston, Wherein, one end of the piston rod extends into the first cylinder barrel, and the first piston is installed at the end of the piston rod located inside the first cylinder barrel. The other end of the piston rod extends into the second cylinder barrel, and the second piston is installed at the end of the piston rod located inside the second cylinder barrel, Wherein, a first guide sleeve is installed at the end of the first cylinder barrel away from the first piston, and a second guide sleeve is installed at the end of the second cylinder barrel away from the second piston; A first rod chamber and a first rodless chamber are formed inside the first cylinder barrel, and a second rod chamber and a second rodless chamber are formed inside the second cylinder barrel, Wherein, a first oil port and a second oil port are provided on the first cylinder barrel. The first oil port is communicated with the first rodless chamber, and the first rodless chamber is communicated with the second rod chamber. The second oil port is communicated with the first rod chamber, Wherein, a third oil port is provided on the second cylinder barrel, and the third oil port is communicated with the second rodless chamber; A tubing is installed inside the piston rod. One end of the tubing is communicated with the first rodless chamber, and an oil passing hole is opened at the other end of the tubing. The oil passing hole is communicated with the second rod chamber; Inject oil into the first oil port to realize the separate extension action of the first cylinder barrel; inject oil into the third oil port to realize the simultaneous extension action of the first cylinder barrel and the second cylinder barrel.

2. The hydraulic cylinder according to claim 1, wherein, A protective cover is installed between the first cylinder barrel and the second cylinder barrel, and the protective cover can expand and contract along with the movement of the first cylinder barrel and the second cylinder barrel.

3. The hydraulic cylinder according to claim 2, wherein, Both between the first cylinder barrel and the protective cover and between the second cylinder barrel and the protective cover are connected by clamps.

4. The hydraulic cylinder according to claim 1, wherein, Knuckle bearings are installed at the outer ends of the first cylinder barrel and the second cylinder barrel.

5. The hydraulic cylinder according to claim 1, characterized in that, Dust-proof rings are installed at the outer ends of the first guide sleeve and the second guide sleeve.

6. The hydraulic cylinder according to any one of claims 1 to 5, characterized in that Dynamic sealing devices are installed between the first piston and the first cylinder barrel, between the piston rod and the first guide sleeve, between the second piston and the second cylinder barrel, and between the piston rod and the second guide sleeve.

7. The hydraulic cylinder according to claim 6, characterized in that, Static sealing devices are installed between the first piston and the piston rod, between the first guide sleeve and the first cylinder barrel, between the second piston and the piston rod, and between the second guide sleeve and the second cylinder barrel.

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