Hydraulic system and hydraulic cylinder

Abstract

The utility model belongs to the technical field of fluid pressure executing mechanisms, and particularly relates to a hydraulic system and a hydraulic cylinder. The piston rod is inserted into the hydraulic cylinder body so as to divide a cavity in the hydraulic cylinder body into a rod cavity and a rodless cavity; the rod cavity and the rodless cavity are each provided with a speed oil port and a pressure oil port, and the speed oil ports are located on the inner sides of the pressure oil ports. The first hydraulic subsystem is connected with the two speed oil ports and is suitable for adjusting the speed of a piston rod; according to the hydraulic system and the hydraulic cylinder, the speed oil port and the pressure oil ports are separately arranged, and the first hydraulic subsystem and the second hydraulic subsystem which can be independently adjusted are used; therefore, the speed of the piston rod can be adjusted at will under the condition that the thrust of the hydraulic cylinder is stable, and the thrust of the hydraulic cylinder can be adjusted at will under the condition that the speed of the piston rod is stable.

Description

Technical Field

[0001] This utility model belongs to the technical field of fluid pressure actuators, specifically relating to a straight cylinder type fluid pressure actuator, and more particularly to a hydraulic system and a hydraulic cylinder. Background Technology

[0002] The existing hydraulic cylinder has only two oil ports on its cylinder body. The two oil ports are connected to the rod chamber and rodless chamber of the cylinder body, respectively. Oil is supplied to the corresponding oil ports through the hydraulic system to make the piston rod move.

[0003] In some testing devices, hydraulic pressure is used to drive the movement of corresponding components for testing. The testing method generally employs a controlled variable approach, meaning that only one variable, such as speed or thrust, needs to be kept constant. If a hydraulic cylinder is used, adjusting the cylinder's movement speed will change the thrust, leading to inaccurate test results. For example, when simulating the effects of thrust and impulse on a test bench, other variables need to be kept constant. Simulating a constant thrust while verifying the effect of impulse requires no change in the pressure provided by the cylinder; simulating a constant impulse while verifying the effect of thrust requires no change in the piston rod speed of the cylinder.

[0004] Based on the above-mentioned technical problems, those skilled in the art urgently need to design a hydraulic system and a hydraulic cylinder.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one hydraulic system and a hydraulic cylinder.

[0007] In a first aspect, embodiments of this disclosure provide a hydraulic system, comprising: a hydraulic cylinder body; a piston rod inserted into the hydraulic cylinder body to divide the chamber within the hydraulic cylinder body into a rod-side chamber and a rodless chamber; both the rod-side chamber and the rodless chamber are provided with a speed port and a pressure port, and the speed port is located between the two pressure ports; a first hydraulic subsystem connected to the two speed ports and adapted to adjust the speed of the piston rod; and a second hydraulic subsystem connected to the two pressure ports and adapted to adjust the thrust of the piston rod.

[0008] In one optional embodiment, a piston and a pair of buffer sleeves are fitted onto the extended end of the piston rod; the piston is located between the two buffer sleeves; wherein, a locking nut is provided on the extended end of the piston rod to press the piston and the buffer sleeves together.

[0009] In one alternative embodiment, the sidewall of the buffer sleeve is inclined, and the side away from the piston is the smaller end.

[0010] In one alternative embodiment, a stop pad is provided on the buffer sleeve on the rod cavity side; the stop pad is connected to the small end of the buffer sleeve.

[0011] In one alternative implementation, when the piston rod moves to the end of its stroke, the buffer sleeve is adapted to block the corresponding speed port.

[0012] In one optional embodiment, the speed port is located on the side wall of the hydraulic cylinder body; the pressure port is located on the bottom of the cavity of the hydraulic cylinder body.

[0013] Secondly, this disclosure also provides a hydraulic cylinder, including: a hydraulic cylinder body; a piston rod inserted into the hydraulic cylinder body to divide the chamber inside the hydraulic cylinder body into a rod-type chamber and a rodless chamber; both the rod-type chamber and the rodless chamber are provided with a speed port and a pressure port, and the speed port is located between the two pressure ports.

[0014] In one optional embodiment, a piston and a pair of buffer sleeves are fitted onto the extended end of the piston rod; the piston is located between the two buffer sleeves; wherein, a locking nut is provided on the extended end of the piston rod to press the piston and the buffer sleeves together.

[0015] In one optional embodiment, the sidewall of the buffer sleeve is inclined, and the side away from the piston is the small end; a stop pad is provided on the buffer sleeve on the rod cavity side; the stop pad is connected to the small end of the buffer sleeve.

[0016] In one alternative embodiment, the speed port is located on the side wall of the hydraulic cylinder body; the pressure port is located on the bottom of the cavity of the hydraulic cylinder body; and when the piston rod moves to the end of its stroke, the buffer sleeve is adapted to block the corresponding speed port.

[0017] The beneficial effects of this utility model are that, by separating the speed oil port and the pressure oil port, and using an independently adjustable first hydraulic subsystem and a second hydraulic subsystem, the hydraulic system and hydraulic cylinder can arbitrarily adjust the piston rod speed while ensuring the stability of the hydraulic cylinder thrust, and can also arbitrarily adjust the hydraulic cylinder thrust while ensuring the stability of the piston rod speed, thus greatly improving the applicability of the hydraulic cylinder.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a hydraulic system provided in an embodiment of the present disclosure;

[0022] Figure 2 This is a schematic diagram of the structure of a hydraulic cylinder moving to the bottom of the rodless cavity according to an embodiment of the present disclosure;

[0023] Figure 3 This is a schematic diagram of the structure of a buffer sleeve provided in an embodiment of the present disclosure;

[0024] Figure 4 This is a cross-sectional view of a buffer sleeve provided in an embodiment of the present disclosure;

[0025] Figure 5 This is a schematic diagram of the structure of a hydraulic cylinder moving to the bottom of the rod chamber, as provided in an embodiment of this disclosure.

[0026] In the picture:

[0027] Hydraulic cylinder body 1, rod chamber 11, rodless chamber 12, speed port 13, pressure port 14;

[0028] Piston rod 2;

[0029] Piston 3;

[0030] Buffer sleeve 4, side wall 41, small end 42;

[0031] Lock nut 5;

[0032] 6-inch stop pad;

[0033] First hydraulic subsystem a, second hydraulic subsystem b. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0036] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] like Figure 1 As shown, at least one embodiment provides a hydraulic system including: a hydraulic cylinder body 1 and a piston rod 2, wherein the piston rod 2 is inserted into the hydraulic cylinder body 1 to divide the chambers within the hydraulic cylinder body 1 into a rod-side chamber 11 and a rodless chamber 12.

[0038] In some embodiments, a speed oil port 13 and a pressure oil port 14 are provided on the rod chamber 11, and a speed oil port 13 and a pressure oil port 14 are also provided on the rodless chamber 12; wherein, the speed oil port 13 is located between the two pressure oil ports 14.

[0039] In some embodiments, the two speed ports 13 are connected to the first hydraulic subsystem a, and the two pressure ports 14 are connected to the second hydraulic subsystem b.

[0040] Specifically, the second hydraulic subsystem b is used to adjust the thrust of the piston rod 2, and the first hydraulic subsystem a is used to adjust the moving speed of the piston rod 2.

[0041] In this embodiment, both the first hydraulic subsystem a and the second hydraulic subsystem b can be adjusted independently, and cooperate with the separately set speed port 13 and pressure port 14. This allows for arbitrary adjustment of the piston rod 2 speed while ensuring stable hydraulic cylinder thrust, and also allows for arbitrary adjustment of the hydraulic cylinder thrust while ensuring stable piston rod 2 speed, greatly improving the applicability of the hydraulic cylinder.

[0042] In some embodiments, both the first hydraulic subsystem a and the second hydraulic subsystem b include: a hydraulic pump, an oil tank, hydraulic oil, pipelines, valves, etc., and the hydraulic pump converts mechanical energy into hydraulic energy to output high-pressure oil.

[0043] like Figure 2 As shown, in some embodiments, a piston 3 and a pair of buffer sleeves 4 are fitted onto the extension end 21 of the piston rod 2; wherein the piston 3 is located between the two buffer sleeves 4.

[0044] In this embodiment, the diameter of the insertion end 21 of the piston rod 2 is reduced to form a mounting platform. The piston 3 and the buffer sleeve 4, which are sleeved on the insertion end 21, both abut against the mounting platform. Then, the locking nut 5 is threadedly connected to the insertion end 21 of the piston rod 2 to press the piston 3 and the buffer sleeve 4.

[0045] like Figures 2 to 4 As shown, in some embodiments, the sidewall 41 of the buffer sleeve 4 is inclined, and the side away from the piston 3 is the small end 42.

[0046] In some embodiments, when the piston rod 2 moves to the end of its stroke, the buffer sleeve 4 is adapted to block the corresponding speed port 13.

[0047] In this embodiment, as the buffer sleeve 4 passes over the speed port 13, the side wall 41 of the buffer sleeve 4 is inclined, which reduces the flow rate of the hydraulic cylinder through the speed port 13, thereby achieving a buffering effect.

[0048] In some embodiments, the material of the buffer sleeve 4 is generally selected as ductile iron or tin bronze with low hardness to prevent scratching the inner wall of the hydraulic cylinder body 1 during movement.

[0049] like Figure 5 As shown, in some embodiments, a stop pad 6 is provided on the buffer sleeve 4 on the rod cavity 11 side, and the stop pad 6 is connected to the small end 42 of the buffer sleeve 4.

[0050] In this embodiment, the stop pad 6 is used to prevent the buffer sleeve 4 from directly colliding with the bottom of the chamber.

[0051] In some embodiments, the speed port 13 is located on the side wall of the hydraulic cylinder body 1, and the pressure port 14 is located on the bottom of the cavity of the hydraulic cylinder body 1.

[0052] like Figure 1 As shown, at least one embodiment also provides a hydraulic cylinder, including: a hydraulic cylinder body 1; a piston rod 2, inserted into the hydraulic cylinder body 1 to divide the chamber in the hydraulic cylinder body 1 into a rod chamber 11 and a rodless chamber 12; both the rod chamber 11 and the rodless chamber 12 are provided with a speed oil port 13 and a pressure oil port 14, and the speed oil port 13 is located between the two pressure oil ports 14.

[0053] Specifically, the two speed ports 13 are connected to the first hydraulic subsystem a, which is used to adjust the moving speed of the piston rod 2; the two pressure ports 14 are connected to the second hydraulic subsystem b, which is used to adjust the thrust of the piston rod 2.

[0054] In this embodiment, both the first hydraulic subsystem a and the second hydraulic subsystem b can be adjusted independently, and cooperate with the separately set speed port 13 and pressure port 14. This allows for arbitrary adjustment of the piston rod 2 speed while ensuring stable hydraulic cylinder thrust, and also allows for arbitrary adjustment of the hydraulic cylinder thrust while ensuring stable piston rod 2 speed, greatly improving the applicability of the hydraulic cylinder.

[0055] like Figure 2 As shown, in some embodiments, a piston 3 and a pair of buffer sleeves 4 are fitted on the extension end 21 of the piston rod 2; the piston 3 is located between the two buffer sleeves 4; wherein, a locking nut 5 is provided on the extension end 21 of the piston rod 2 to press the piston 3 and the buffer sleeves 4 together.

[0056] In this embodiment, the diameter of the insertion end 21 of the piston rod 2 is reduced to form a mounting platform. The piston 3 and the buffer sleeve 4, which are sleeved on the insertion end 21, both abut against the mounting platform. Then, the locking nut 5 is threadedly connected to the insertion end 21 of the piston rod 2 to press the piston 3 and the buffer sleeve 4.

[0057] like Figures 2 to 4 As shown, in some embodiments, the sidewall 41 of the buffer sleeve 4 is inclined, and the side away from the piston 3 is the small end 42; a stop pad 6 is provided on the buffer sleeve 4 on the rod cavity 11 side; the stop pad 6 is connected to the small end 42 of the buffer sleeve 4.

[0058] In some embodiments, the speed port 13 is located on the side wall of the hydraulic cylinder body 1; the pressure port 14 is located on the bottom of the cavity of the hydraulic cylinder body 1; when the piston rod 2 moves to the end of its stroke, the buffer sleeve 4 is adapted to block the corresponding speed port 13.

[0059] In this embodiment, as the buffer sleeve 4 passes over the speed port 13, the side wall 41 of the buffer sleeve 4 is inclined, which reduces the flow rate of the hydraulic cylinder through the speed port 13, thereby achieving a buffering effect.

[0060] In summary, by separating the speed port 13 and the pressure port 14, and using the independently adjustable first hydraulic subsystem a and second hydraulic subsystem b, this hydraulic system and hydraulic cylinder can arbitrarily adjust the speed of the piston rod 2 while ensuring the stability of the hydraulic cylinder thrust, and can also arbitrarily adjust the thrust of the hydraulic cylinder while ensuring the stability of the piston rod 2 speed, thus greatly improving the applicability of the hydraulic cylinder.

[0061] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0062] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0063] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0064] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0065] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0066] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0068] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0069] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0070] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic system, characterized in that, include: Hydraulic cylinder body (1); The piston rod (2) is inserted into the hydraulic cylinder body (1) to divide the chamber inside the hydraulic cylinder body (1) into a rod chamber (11) and a rodless chamber (12). Both the rod chamber (11) and the rodless chamber (12) are provided with a speed oil port (13) and a pressure oil port (14), and the speed oil port (13) is located between the two pressure oil ports (14); The first hydraulic subsystem (a) is connected to two speed ports (13) and is suitable for adjusting the speed of the piston rod (2); The second hydraulic subsystem (b) is connected to two pressure ports (14) and is suitable for adjusting the thrust of the piston rod (2).

2. The hydraulic system as described in claim 1, characterized in that, A piston (3) and a pair of buffer sleeves (4) are fitted on the extension end (21) of the piston rod (2). The piston (3) is located between the two buffer sleeves (4); The piston rod (2) is provided with a locking nut (5) on its extension end (21) to press the piston (3) and the buffer sleeve (4).

3. The hydraulic system as described in claim 2, characterized in that, The sidewall (41) of the buffer sleeve (4) is inclined, and the side away from the piston (3) is the small end (42).

4. The hydraulic system as described in claim 3, characterized in that, A stop pad (6) is provided on the buffer sleeve (4) on the rod cavity (11) side. The stop pad (6) is connected to the small end (42) of the buffer sleeve (4).

5. The hydraulic system as described in claim 4, characterized in that, When the piston rod (2) moves to the end of its stroke, the buffer sleeve (4) is adapted to block the corresponding speed port (13).

6. The hydraulic system as described in claim 4, characterized in that, The speed port (13) is located on the side wall of the hydraulic cylinder body (1); The pressure port (14) is located on the bottom of the cavity of the hydraulic cylinder body (1).

7. A hydraulic cylinder, characterized in that, include: Hydraulic cylinder body (1); The piston rod (2) is inserted into the hydraulic cylinder body (1) to divide the chamber inside the hydraulic cylinder body (1) into a rod chamber (11) and a rodless chamber (12). Both the rod chamber (11) and the rodless chamber (12) are provided with a speed oil port (13) and a pressure oil port (14), and the speed oil port (13) is located between the two pressure oil ports (14).

8. The hydraulic cylinder as described in claim 7, characterized in that, A piston (3) and a pair of buffer sleeves (4) are fitted on the extension end (21) of the piston rod (2). The piston (3) is located between the two buffer sleeves (4); The piston rod (2) is provided with a locking nut (5) on its extension end (21) to press the piston (3) and the buffer sleeve (4).

9. The hydraulic cylinder as described in claim 8, characterized in that, The sidewall (41) of the buffer sleeve (4) is inclined, and the side away from the piston (3) is the small end (42). A stop pad (6) is provided on the buffer sleeve (4) on the rod cavity (11) side. The stop pad (6) is connected to the small end (42) of the buffer sleeve (4).

10. The hydraulic cylinder as described in claim 9, characterized in that, The speed port (13) is located on the side wall of the hydraulic cylinder body (1); The pressure port (14) is located on the bottom of the cavity of the hydraulic cylinder body (1); When the piston rod (2) moves to the end of its stroke, the buffer sleeve (4) is adapted to block the corresponding speed port (13).

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