Combined hydraulic cylinder

Abstract

The utility model discloses a combined hydraulic cylinder which comprises a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder, the first hydraulic cylinder comprises a first cavity, a first piston rod and a second hydraulic cylinder, the first cavity is used for containing working media, and the first piston rod and the second hydraulic cylinder are arranged in the first cavity. The second hydraulic cylinder comprises a second cavity for containing a working medium and a second piston rod arranged in the second cavity, the third hydraulic cylinder is arranged between the first hydraulic cylinder and the second hydraulic cylinder, the third hydraulic cylinder comprises a third piston rod, the third piston rod is connected with the first piston rod and the second piston rod, and the third piston rod can move in a reciprocating mode. According to the combined hydraulic cylinder, a three-piston structure is adopted, the third piston rod reciprocates to drive the first piston rod and the second piston rod to reciprocate, working media in the first cavity and the second cavity can be continuously pressurized, energy consumption can be reduced, working efficiency can be improved, space can be saved, and environmental protection and energy conservation are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and more specifically, to a combined hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The existing combined hydraulic cylinder has the problem of low working efficiency.

[0003] Therefore, how to improve the working efficiency of the hydraulic cylinder has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, an object of the utility model is to provide a combined hydraulic cylinder to improve working efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A combined hydraulic cylinder, comprising:

[0007] A first hydraulic cylinder, the first hydraulic cylinder comprising a first cavity containing a working medium and a first piston rod disposed in the first cavity;

[0008] A second hydraulic cylinder, the second hydraulic cylinder comprising a second cavity containing a working medium and a second piston rod disposed in the second cavity;

[0009] The third hydraulic cylinder is arranged between the first hydraulic cylinder and the second hydraulic cylinder. The third hydraulic cylinder comprises a third piston rod. The third piston rod is connected to the first piston rod and the second piston rod respectively. The third piston rod can move back and forth.

[0010] Optionally, in the above-mentioned combined hydraulic cylinder, the third hydraulic cylinder includes a third cavity and a fourth cavity that are connected to each other, the third cavity and the fourth cavity are both connected to the hydraulic system, and the third piston rod passes through the third cavity and the fourth cavity.

[0011] Optionally, in the above-mentioned combined hydraulic cylinder, the third hydraulic cylinder is provided with a first interface and a second interface connected to the hydraulic system, the first interface is connected to the third cavity, the second interface is connected to the fourth cavity, and the first interface and the second interface can be switched with each other.

[0012] Optionally, in the above-mentioned combined hydraulic cylinder, a magnetostrictive displacement sensor is provided on at least one of the first hydraulic cylinder and the second hydraulic cylinder, and the magnetostrictive displacement sensor is electrically connected to the hydraulic system.

[0013] Optionally, in the above-described combined hydraulic cylinder, the transmission medium of the third hydraulic cylinder is hydraulic oil.

[0014] Optionally, in the above-described combined hydraulic cylinder, the first hydraulic cylinder, the third hydraulic cylinder, and the second hydraulic cylinder are detachably connected.

[0015] Optionally, in the above-described combined hydraulic cylinder, the working media in the first hydraulic cylinder and the second hydraulic cylinder include water, polymer, and mud.

[0016] Optionally, in the above-described combined hydraulic cylinder, a first liquid inlet and a first liquid outlet are provided on the first hydraulic cylinder, and check valves are provided on both the first liquid inlet and the first liquid outlet;

[0017] A second liquid inlet and a second liquid outlet are provided on the second hydraulic cylinder, and check valves are provided on both the second liquid inlet and the second liquid outlet.

[0018] Optionally, in the above-described combined hydraulic cylinder, air release and evacuation valves and hydraulic filters are provided on both the first hydraulic cylinder and the second hydraulic cylinder.

[0019] Optionally, in the above-described combined hydraulic cylinder, sealing structures are provided between the first hydraulic cylinder and the third hydraulic cylinder, and between the third hydraulic cylinder and the second hydraulic cylinder.

[0020] As can be seen from the above solution, the combined hydraulic cylinder disclosed in the present invention adopts a three-piston structure. By the reciprocating movement of the third piston rod, the reciprocating movement of the first piston rod and the second piston rod is driven, and the working media in the first cavity and the second cavity can be continuously pressurized, which can reduce energy consumption, improve work efficiency, save space, and be environmentally friendly and energy-saving. At the same time, compared with the prior art in which a high-pressure plunger pump or a multistage centrifugal pump is used to pressurize the working medium, the structure of the combined hydraulic cylinder is simpler, which can improve efficiency, enhance the stability and reliability of the system, and reduce the need for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the combined hydraulic cylinder disclosed in the embodiment of the present invention;

[0023] Figure 2 It is a cross-sectional view of the combined hydraulic cylinder disclosed in the embodiment of the present invention;

[0024] Figure 3 This is the top view of the combined hydraulic cylinder disclosed in the embodiment of the present utility model.

[0025] Among them, 10 is the first hydraulic cylinder, 11 is the first cavity, 12 is the first piston rod, and 13 is the first piston;

[0026] 20 is the second hydraulic cylinder, 21 is the second cavity, 22 is the second piston rod, and 23 is the second piston;

[0027] 30 is the third hydraulic cylinder, 31 is the third piston rod, 311 is the third piston, 32 is the third cavity, and 33 is the fourth cavity;

[0028] 40 is the magnetostrictive displacement sensor. Specific embodiments

[0029] In addition to the problems mentioned in the background art, there are also the following problems: In the prior art, liquid transportation mostly uses high-pressure plunger pumps or multistage centrifugal pumps for pressurization and boosting. There are the following problems with this method: the maximum pressure value of the liquid is low (the multistage centrifugal pump will not exceed 21 MPa, and the plunger pump generally will not exceed 25 MPa), the specific consumption is high, the service life is short, the energy consumption is large, the efficiency is low, and the maintenance is frequent.

[0030] The core of the present utility model lies in disclosing a combined hydraulic cylinder to improve work efficiency.

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] As Figure 1 and Figure 3 shown, the embodiment of the present utility model discloses a combined hydraulic cylinder, including a first hydraulic cylinder 10, a second hydraulic cylinder 20, and a third hydraulic cylinder 30.

[0033] As Figure 2 shown, the first hydraulic cylinder 10, the third hydraulic cylinder 30, and the second hydraulic cylinder 20 are coaxially arranged, and the third hydraulic cylinder 30 is arranged between the first hydraulic cylinder 10 and the second hydraulic cylinder 20. As Figure 1As shown in the figure, the first hydraulic cylinder 10 includes a first cavity 11 that houses a working medium and a first piston rod 12 disposed within the first cavity 11. A first piston 13 is provided on the first piston rod 12. The second hydraulic cylinder 20 includes a second cavity 21 that houses a working medium and a second piston rod 22 disposed within the second cavity 21. A second piston 23 is provided on the second piston rod 22.

[0034] The third hydraulic cylinder 30 includes a third piston rod 31. A third piston 311 is provided on the third piston rod 31. The third piston rod 31 is respectively connected to the first piston rod 12 and the second piston rod 22, and the third piston rod 31 can reciprocate along the axial direction, that is, the third piston rod 31 can move in the direction close to the first hydraulic cylinder 10 and close to the second hydraulic cylinder 20. The moving direction of the third piston rod 31 shown in the figure is the left-right direction.

[0035] When the third piston rod 31 moves leftward as shown in the figure, it can drive the first piston rod 12 to move leftward, thereby pressurizing the working medium in the first cavity 11; when the third piston rod 31 moves rightward as shown in the figure, it can drive the second piston rod 22 to move rightward, thereby pressurizing the working medium in the second cavity 11.

[0036] The first piston rod 12, the second piston rod 22, and the third piston rod 31 can be of an integral structure or a split structure. Preferably, they are of an integral structure. The first piston 13 and the second piston 23 are disposed at both ends of the third piston rod 31, and the third piston 311 is disposed between the first piston 13 and the second piston 23 and is located within the third hydraulic cylinder 30, forming a three-piston structure.

[0037] The combined hydraulic cylinder disclosed in the embodiment of the present invention adopts a three-piston structure. By the reciprocating movement of the third piston rod 31, it drives the first piston rod 12 and the second piston rod 22 to reciprocate, and can continuously pressurize the working medium in the first cavity 11 and the second cavity 21. It can reduce energy consumption, improve work efficiency, save space, and be environmentally friendly and energy-saving. At the same time, compared with the prior art of pressurizing the working medium by using a high-pressure plunger pump or a multistage centrifugal pump, the structure of using the combined hydraulic cylinder is simpler, can improve efficiency, enhance the stability and reliability of the system, and reduce the need for maintenance.

[0038] Such as Figure 1As shown, the third hydraulic cylinder 30 includes a third cavity 32 and a fourth cavity 33. The third piston 311 separates the third cavity 32 and the fourth cavity 33. The third piston rod 31 passes through the third cavity 32 and the fourth cavity 33. Both the third cavity 32 and the fourth cavity 33 are connected to the hydraulic system. The hydraulic system supplies a transmission medium to the third cavity 32 and the fourth cavity 33 to push the third piston 311 to move, thereby driving the first piston rod 12 and the second piston rod 22 to move. The transmission medium is preferably hydraulic oil.

[0039] In some specific embodiments, the third hydraulic cylinder 30 is provided with a first interface and a second interface connected to the hydraulic system. The first interface is connected to the third cavity 32, and the second interface is connected to the fourth cavity 33. The first interface and the second interface are respectively connected to the hydraulic system. When the third piston rod 31 needs to move in the direction close to the first hydraulic cylinder 10 (shown as moving to the left in the figure), the transmission medium in the hydraulic system enters the fourth cavity 33, thereby pushing the third piston rod 31 to move in the direction close to the first hydraulic cylinder 10, and the transmission medium in the third cavity 32 flows out. When the third piston rod 31 needs to move in the direction close to the second hydraulic cylinder 20 (shown as moving to the right in the figure), the transmission medium in the hydraulic system enters the third cavity 32, thereby pushing the third piston rod 31 to move in the direction close to the second hydraulic cylinder 20, and the transmission medium in the fourth cavity 33 flows out. By setting a reversing valve on the hydraulic system, the switching between the first interface and the second interface is realized. Here, the switching means that one of the first interface and the second interface is for liquid inlet and the other is for liquid outlet.

[0040] In some specific embodiments, the combined hydraulic cylinder includes a controller. Under the action of the controller, the switching between the first interface and the second interface can be realized. Specifically, it can be switched according to the set time, or can be switched according to the positions of the first piston rod 12 and the second piston rod 22. In some specific embodiments, at least one of the first hydraulic cylinder 10 and the second hydraulic cylinder 20 is provided with a magnetostrictive displacement sensor 40. The magnetostrictive displacement sensor 40 is electrically connected to the reversing valve of the hydraulic system. Figure 1 As shown in the figure, the magnetostrictive displacement sensor 40 is arranged on the first hydraulic cylinder 10. The arrangement of the magnetostrictive displacement sensor 40 can detect the position of the first piston rod 12 at any time and transmit the detected position information to the controller. The controller can control the reversing action of the reversing valve according to the detected position information. The setting of the controller can realize the digitalization of the movement displacement of the combined hydraulic cylinder.

[0041] In some specific embodiments, the first hydraulic cylinder 10, the third hydraulic cylinder 30, and the second hydraulic cylinder 20 are connected in sequence. Specifically, it can be by a detachable connection method, such as connected by a flange, or can be by a non-detachable connection method, such as a welding connection method. The detachable connection method is preferred for convenient maintenance.

[0042] In the combined hydraulic cylinder disclosed in the embodiment of the present utility model, the working medium in the first hydraulic cylinder 10 and the second hydraulic cylinder 20 includes, but is not limited to, water, polymer, and slurry, and may also be other liquids. The types of the working medium in the first hydraulic cylinder 10 and the second hydraulic cylinder 20 may be the same or different, and are specifically determined according to actual requirements. When the working media are different, the combined hydraulic cylinder can be used to boost different media.

[0043] Further, a first liquid inlet and a second liquid outlet are provided on the first hydraulic cylinder 10, and check valves are provided on both the first liquid inlet and the first liquid outlet. A second liquid inlet and a second liquid outlet are provided on the second hydraulic cylinder 20, and check valves are provided on both the second liquid inlet and the second liquid outlet. The check valves can prevent the backflow of the working medium.

[0044] Further, air release and evacuation valves are provided on both the first hydraulic cylinder 10 and the second hydraulic cylinder 20 to remove the gas in the working medium and ensure the normal operation of the system. In order to filter out the solid impurities in the working medium and ensure the normal operation of the system, hydraulic filters are provided on both the first hydraulic cylinder 10 and the second hydraulic cylinder 20. At the same time, in order to discharge the overflowing working medium in the first hydraulic cylinder 10 and the second hydraulic cylinder 20, overflow pipes are also provided on the first hydraulic cylinder 10 and the second hydraulic cylinder 20, which can centralize the overflow water. When the working medium is water, water discharge ports are also provided on the first hydraulic cylinder 10 and the second hydraulic cylinder 20.

[0045] In the combined hydraulic cylinder disclosed in the embodiment of the present utility model, a sealing structure is provided between the first hydraulic cylinder 10 and the third hydraulic cylinder 30, and between the third hydraulic cylinder 30 and the second hydraulic cylinder 20. The sealing structure can prevent the leakage of the working medium.

[0046] It should be noted that each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0047] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "one", "a kind of" and / or "the" are not specifically singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not form an exclusive list. The method or device may also include other steps or elements. The element defined by the statement "including one..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0048] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0049] In this text, specific examples are used to elaborate on the principles and implementation manners of the present utility model. The description of the above embodiments is only for helping to understand the core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A combined hydraulic cylinder, characterized in that, Comprising: A first hydraulic cylinder (10), the first hydraulic cylinder (10) including a first cavity (11) for containing a working medium and a first piston rod (12) disposed within the first cavity (11); A second hydraulic cylinder (20), the second hydraulic cylinder (20) including a second cavity (21) for containing a working medium and a second piston rod (22) disposed within the second cavity (21); A third hydraulic cylinder (30), the third hydraulic cylinder (30) being disposed between the first hydraulic cylinder (10) and the second hydraulic cylinder (20), the third hydraulic cylinder (30) including a third piston rod (31), the third piston rod (31) being respectively connected to the first piston rod (12) and the second piston rod (22), and the third piston rod (31) being capable of reciprocating movement.

2. The combined hydraulic cylinder according to claim 1, wherein The third hydraulic cylinder (30) includes a third cavity (32) and a fourth cavity (33) that are in communication, both the third cavity (32) and the fourth cavity (33) being in communication with a hydraulic system, and the third piston rod (31) passing through the third cavity (32) and the fourth cavity (33).

3. The combined hydraulic cylinder according to claim 2, wherein The third hydraulic cylinder (30) is provided with a first interface and a second interface that are in communication with the hydraulic system, the first interface being in communication with the third cavity (32), the second interface being in communication with the fourth cavity (33), and the first interface and the second interface being capable of switching with each other.

4. The combined hydraulic cylinder according to claim 3, wherein At least one of the first hydraulic cylinder (10) and the second hydraulic cylinder (20) is provided with a magnetostrictive displacement sensor (40), and the magnetostrictive displacement sensor (40) is electrically connected to the hydraulic system.

5. The combined hydraulic cylinder according to claim 3, characterized in that, The transmission medium of the third hydraulic cylinder (30) is hydraulic oil.

6. The combined hydraulic cylinder according to claim 1, wherein The first hydraulic cylinder (10), the third hydraulic cylinder (30), and the second hydraulic cylinder (20) are detachably connected.

7. The combined hydraulic cylinder according to claim 1, characterized in that, The working media within the first hydraulic cylinder (10) and the second hydraulic cylinder (20) include water, polymer, and mud.

8. The combined hydraulic cylinder according to claim 1, characterized in that, The first hydraulic cylinder (10) is provided with a first liquid inlet and a first liquid outlet, and one-way valves are provided on both the first liquid inlet and the first liquid outlet; The second hydraulic cylinder (20) is provided with a second liquid inlet and a second liquid outlet, and the one-way valves are provided on both the second liquid inlet and the second liquid outlet.

9. The combined hydraulic cylinder according to claim 8, wherein, Both the first hydraulic cylinder (10) and the second hydraulic cylinder (20) are provided with air release and evacuation valves and hydraulic filters.

10. The combined hydraulic cylinder according to any one of claims 1-9, characterized in that, Sealing structures are provided between the first hydraulic cylinder (10) and the third hydraulic cylinder (30), and between the third hydraulic cylinder (30) and the second hydraulic cylinder (20).

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