A double hydraulic cylinder structure

Abstract

The present invention provides a double hydraulic cylinder structure. A double hydraulic cylinder structure includes an oil circuit control system and a first hydraulic cylinder and a second hydraulic cylinder respectively connected to the oil circuit control system. The first hydraulic cylinder includes a cylinder barrel, a piston rod and a piston. The cylinder barrel includes a first cavity without a rod, a second cavity with a rod and a third cavity arranged inside the piston rod and the size of the cavity changes with the extension length of the piston rod. The first cavity, the second cavity and the third cavity are not connected to each other. The second hydraulic cylinder includes a fourth cavity without a rod and a fifth cavity with a rod; the third cavity is connected to the fourth cavity or the fifth cavity through the oil circuit control system. The present invention uses a structure in which two hydraulic cylinders are linked and an oil circuit control system is matched, so that the first hydraulic cylinder can drive the extension and contraction of the second hydraulic cylinder, and can also independently control the extension and contraction of the second hydraulic cylinder. In the lifting or arm lifting adjustment, the leveling mechanism can be adjusted more smoothly and occupy less layout space.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control machinery, and more specifically, to a double hydraulic cylinder structure. Background Art

[0002] In lifting machinery, hydraulic devices are often used to drive the arm to lift or swing the arm to achieve the movement of the heavy arm.

[0003] For example, in the process of tunnel, underground engineering and mining construction, it is necessary to use the drill arm of the rock drill to drill blasting holes, but the actual rock section is uneven. To ensure the best blasting effect, the rock drilling propulsion beam on the drill arm must always maintain a certain angle with the center line of the tunnel during drilling operations; the leveling of the rock drilling propulsion beam is a key technology. When adjusting the height or left and right position of the main arm, if there is no leveling or adjustment device under the rock drilling propulsion beam, the top rock drilling propulsion beam will not remain parallel to the initial position, which will cause the drilling path to be unable to be parallel, and ultimately affect the blasting effect.

[0004] In the current technical means, when the main arm cylinder drives the main arm to pitch, there are many ways to level or adjust the rock drilling propulsion beam to ensure the translation of the rock drilling propulsion beam, but most of the structural layouts are relatively complex, and the translation structure increases the space of the equipment, affecting the freedom of movement of the main arm when it swings or pitches; for example, CN 205805428 U discloses a translation mechanism of the drill arm of a tunneling drilling vehicle, in which the cylinder linkage structure realizes the translation of the rock drilling propulsion beam when it pitches by cooperating with an arm lifting cylinder, an arm lifting translation signal cylinder and an arm lifting translation signal cylinder cooperating with the arm lifting translation signal cylinder. The arm lifting translation signal cylinder is added on one side of the arm lifting cylinder. Such a cylinder linkage structure increases the overall layout space, and also affects the freedom of movement of the main arm, which will be subject to certain restrictions when the rock drilling vehicle turns.

[0005] Use new content

[0006] The present invention provides a double hydraulic cylinder structure to overcome the problem that the three-cylinder linkage structure described in the above background technology increases the overall layout space, affects the freedom of movement of the main arm, and is subject to certain restrictions when the rock drilling vehicle turns.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual hydraulic cylinder structure, including an oil circuit control system and a first hydraulic cylinder and a second hydraulic cylinder respectively connected to the oil circuit control system, the first hydraulic cylinder including a cylinder barrel, a piston rod and a piston, the cylinder barrel including a rodless first cavity, a second cavity with a rod and a third cavity arranged inside the piston rod and the cavity size changes with the extension length of the piston rod, the first cavity, the second cavity and the third cavity are not connected to each other, the second hydraulic cylinder includes a rodless fourth cavity and a rod-equipped fifth cavity; the third cavity is connected to the fourth cavity or the fifth cavity through the oil circuit control system.

[0008] Furthermore, the first hydraulic cylinder also includes a guide rod arranged in the cylinder barrel, the piston rod is a hollow structure, one end of the guide rod is fixed on the inner bottom wall of the cylinder barrel, the guide rod is arranged parallel to the piston rod, one end of the piston rod located in the cylinder barrel is connected to the piston, the piston rod and the piston are both sleeved on the guide rod, the inner wall of the piston is slidingly and sealingly connected to the guide rod, the outer wall of the piston is slidingly and sealingly connected to the inner wall of the cylinder barrel, the piston divides the interior of the cylinder barrel into a first cavity and a second cavity, and the guide rod and the interior of the piston rod form the third cavity.

[0009] Furthermore, a first connecting ear is provided on the outer wall of one end of the cylinder bottom of the first hydraulic cylinder, and a second connecting ear is provided on the end of the piston rod away from the first connecting ear.

[0010] Preferably, the outer wall of the guide rod is slidably and sealingly connected to the inner wall of the piston rod, and there is always a distance between one end of the guide rod close to the second connecting ear and one end of the inner cavity of the piston rod close to the second connecting ear to form the third cavity.

[0011] Furthermore, the cylinder is a structure with one end open and the other end sealed, the piston rod is inserted into the interior of the cylinder from the open end of the cylinder, a sealing ring is fixedly provided on the circumferential inner wall of the open end of the cylinder, the sealing ring is sleeved on the piston rod and is slidingly and sealingly connected to the piston rod.

[0012] Further, the oil circuit control system includes a pressure oil source, a first control valve and a second control valve, one end of the first control valve and one end of the second control valve are respectively connected to the pressure oil source;

[0013] The other end of the first control valve is connected to the first cavity via a first oil circuit, and the other end of the first control valve is also connected to the second cavity via a second oil circuit;

[0014] The other end of the second control valve is connected to the fourth cavity via a fourth oil circuit; the other end of the second control valve is also connected to the fifth cavity via a fifth oil circuit;

[0015] The third cavity is connected to the fourth oil circuit via the third oil circuit; the first oil circuit is connected to the fifth oil circuit via the sixth oil circuit;

[0016] The sixth oil circuit is provided with a one-way valve, and the sixth oil circuit is also connected to the first oil return port through the seventh oil circuit on the outlet side of the one-way valve, and the seventh oil circuit is provided with a hydraulically controlled one-way valve.

[0017] Preferably, the first oil circuit and the second oil circuit are both provided with a first balancing valve;

[0018] The third oil circuit and the fourth oil circuit are connected to the second oil return port through the overflow valve at one end close to the second hydraulic cylinder, and the fourth oil circuit and the fifth oil circuit are jointly provided with a second balancing valve. After the third oil circuit is connected with the fourth oil circuit, it enters the second balancing valve.

[0019] As a preferred implementation, the first control valve and the second control valve are both O-type reversing valves.

[0020] As another preferred implementation, the first control valve and the second control valve are both Y-type reversing valves, and a first hydraulic lock is provided on a side of the fourth oil circuit and the fifth oil circuit close to the first control valve.

[0021] As another preferred embodiment, the first control valve and the second control valve are both proportional valves, the first control valve and the second control valve are both Y-type reversing valves, and a second hydraulic lock is provided on the side of the fourth oil circuit and the fifth oil circuit close to the first control valve.

[0022] Compared with the prior art, the beneficial effects are:

[0023] 1. The present invention adopts a structure in which two hydraulic cylinders are linked and matched with a reasonably arranged oil circuit control system, so that the first hydraulic cylinder can drive the extension and retraction of the second hydraulic cylinder, and can also independently control the extension and retraction of the second hydraulic cylinder. In the process of lifting or arm lifting adjustment, the leveling mechanism can be adjusted more smoothly and occupies less layout space. When used in lifting or drilling machinery, the overall size of the machinery is smaller and the use is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the internal structure of the first hydraulic cylinder in the present invention.

[0026] Figure 3It is a structural schematic diagram of Example 2.

[0027] Figure 4 It is a structural schematic diagram of Example 3. DETAILED DESCRIPTION

[0028] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0031] Example 1

[0032] This embodiment provides a dual hydraulic cylinder structure, such as Figure 1 and Figure 2 As shown, a dual hydraulic cylinder structure includes an oil circuit control system and a first hydraulic cylinder 10 and a second hydraulic cylinder 20 respectively connected to the oil circuit control system. The first hydraulic cylinder 10 includes a cylinder barrel 1, a piston rod 2 and a piston 3. The cylinder barrel 1 includes a rodless first cavity 7, a rod-containing second cavity 8 and a third cavity 9 which is arranged inside the piston rod 2 and whose cavity size changes with the extension length of the piston rod 2. The first cavity 7, the second cavity 8 and the third cavity 9 are not connected to each other. The second hydraulic cylinder 20 includes a rodless fourth cavity 21 and a rod-containing fifth cavity 22; the third cavity 9 is connected to the fourth cavity 21 through the oil circuit control system.

[0033] like Figure 1As shown, the first hydraulic cylinder 10 also includes a guide rod 4 arranged in the cylinder barrel 1, the piston rod 2 is a hollow structure, one end of the guide rod 4 is fixed on the inner bottom wall of the cylinder barrel 1, the guide rod 4 and the piston rod 2 are arranged in parallel, the end of the piston rod 2 located in the cylinder barrel 1 is connected to the piston 3, the piston rod 2 and the piston 3 are both sleeved on the guide rod 4, the inner wall of the piston 3 is slidably sealed and connected to the guide rod 4, the outer wall of the piston 3 is slidably sealed and connected to the inner wall of the cylinder barrel 1, the piston 3 divides the inside of the cylinder barrel 1 into a first cavity 7 and a second cavity 8, the guide rod 4 and the inside of the piston rod 2 form a third cavity 9; the third cavity 9 is also connected to a one-way exhaust port 11, the first A first connecting ear 5 is also provided on the outer wall of one end of the bottom of the cylinder barrel 1 of the hydraulic cylinder 10, and a second connecting ear 6 is provided on the end of the piston rod 2 away from the first connecting ear 5; the outer wall of the guide rod 4 is slidingly and sealingly connected to the inner wall of the piston rod 2, and there is always a gap between the end of the guide rod 4 close to the second connecting ear 6 and the end of the inner cavity of the piston rod 2 close to the second connecting ear 6 to form a third cavity 9; the cylinder barrel 1 is a structure with one end open and the other end sealed, and the piston rod 2 is inserted into the interior of the cylinder barrel 1 from the open end of the cylinder barrel 1, and a sealing ring is fixedly provided on the circumferential inner wall of the open end of the cylinder barrel 1, and the sealing ring is sleeved on the piston rod 2 and slidingly and sealingly connected to the piston rod 2.

[0034] In this embodiment, the oil circuit control system includes a pressure oil source 12, a first control valve 13 and a second control valve 14, one end of the first control valve 13 and one end of the second control valve 14 are respectively connected to the pressure oil source 12; the other end of the first control valve 13 is connected to the first cavity 7 via a first oil circuit a, and the other end of the first control valve 13 is also connected to the second cavity 8 via a second oil circuit b; the other end of the second control valve 14 is connected to the fourth cavity 21 via a fourth oil circuit d; the other end of the second control valve 14 is also connected to the fifth cavity 22 via a fifth oil circuit e; the third cavity 9 is connected to the fourth oil circuit d via the third oil circuit c; the first oil circuit a is connected to the fifth oil circuit e via the sixth oil circuit f; a one-way valve 18 is provided on the sixth oil circuit f, and the sixth oil circuit f is also connected to the first oil return port T1 via the seventh oil circuit g on the outlet side of the one-way valve 18, and a hydraulically controlled one-way valve 19 is provided on the seventh oil circuit g.

[0035] In this embodiment, the first control valve 13 and the second control valve 14 are both O-type reversing valves; when the O-type reversing valve is in the middle position, the corresponding two oil circuits are closed and the oil circuits are not interconnected, so that the first hydraulic cylinder 10 and the second hydraulic cylinder 20 can be fixed in the working position and remain motionless, and will not move significantly even if an external force is applied; and a first balancing valve 15 is commonly provided on the first oil circuit a and the second oil circuit b; the third oil circuit c and the fourth oil circuit d are respectively connected to the second oil return port T2 through the overflow valve 17 at one end near the second hydraulic cylinder 20, and the fourth oil circuit d and the fifth oil circuit e are commonly provided with a second balancing valve 16, and the third oil circuit c enters the second balancing valve 16 after being connected to the fourth oil circuit d. The first balancing valve 15 and the second balancing valve 16 are both bidirectional balancing valves, and a sequence valve and a one-way valve are provided on each oil circuit to control the flow of liquid in two directions (the first balancing valve 15 and the second balancing valve 16 can also be replaced with hydraulic locks, which can also achieve the same effect); the first balancing valve 15 makes the oil outlet speed of the first oil circuit a and the second oil circuit b more uniform, so that the action of the first hydraulic cylinder 10 is more stable; the second balancing valve 16 makes the oil outlet speed of the fourth oil circuit d and the fifth oil circuit e more uniform, so that the action of the first hydraulic cylinder 10 is more stable. The function of the overflow valve 17 is: when the second hydraulic cylinder 20 acts alone, if the piston rod of the second hydraulic cylinder 20 is fully extended or fully retracted, and then the two hydraulic cylinders are linked, the oil in the fourth cavity 21 or the fifth cavity 22 of the second hydraulic cylinder 20 can flow out from the overflow valve 17 to the second oil return port T2 to prevent the second hydraulic cylinder 20 from exploding.

[0036] In this embodiment, the specific working process is as follows: when the first hydraulic cylinder 10 needs to be extended, the second hydraulic cylinder 20 needs to be linked to retract; then the first control valve 13 is adjusted to the left position, and the high-pressure oil in the pressure oil source 12 passes through the first oil circuit a and the one-way valve on the left side of the first balance valve 15 and enters the first cavity 7 from the A port, the piston rod 2 of the first hydraulic cylinder 10 is extended, and the oil in the second cavity 8 flows from the B port into the second oil circuit b and flows back to the third oil return port T3; at the same time, the high-pressure oil in the pressure oil source 12 passes through the first oil circuit a and then turns to the sixth oil circuit f and passes through the one-way valve 18, and then flows to the fifth oil circuit e and passes through the one-way valve on the right side of the second balance valve 16 and enters the fifth cavity 22 from the E oil inlet of the second hydraulic cylinder 20, the second hydraulic cylinder 20 retracts, and the oil in the fourth cavity 21 flows out from the D port and flows into the third cavity 9 through the fourth oil circuit d and the third oil circuit c;

[0037] When the first hydraulic cylinder 10 needs to be retracted, the second hydraulic cylinder 20 needs to be extended in linkage; the first control valve 13 is adjusted to the right position, and the high-pressure oil from the second oil circuit b passes through the one-way valve on the right side of the first balancing valve 15 and then enters the second cavity 8 through the B port, the first hydraulic cylinder 10 retracts, and the oil in the first cavity 7 flows back to the third oil return port T3 from the A port; at the same time, the volume of the third cavity 9 decreases, and the high-pressure oil in the third cavity 9 flows out from the Y port and then flows through the third oil circuit c to the fourth oil circuit d, and then flows through the one-way valve on the left side of the second balancing valve 16 to the D port of the second hydraulic cylinder 20 and enters the fourth cavity 21, and the second hydraulic cylinder 20 retracts; the high-pressure oil in the fifth cavity 22 flows through the right side of the second balancing valve 16 to the sixth oil circuit f, and finally flows back to the first oil return port T1 through the hydraulically controlled one-way valve 19 on the seventh oil circuit g;

[0038] When the second hydraulic cylinder 20 is extended and retracted alone, the first control valve 13 is adjusted to the middle position, and the second control valve 14 is adjusted; when the second control valve 14 is in the left position, the high-pressure oil is pumped into the D port through the fourth oil circuit d and pressed into the fourth cavity 21, the second hydraulic cylinder 20 is extended, and the oil in the fifth cavity 22 flows back to the fourth oil return port T4; when the second control valve 14 is in the right position, the high-pressure oil is pumped into the fifth cavity 22 through the fifth oil circuit e, the second hydraulic cylinder 20 is retracted, and the oil in the fourth cavity 21 flows back to the fourth oil return port T4 after passing through the left side of the second balance valve 16. The first oil return port T1, the second oil return port T2, the third oil return port T3 and the fourth oil return port T4 can be the same port or different ports, and finally converge into the same oil tank.

[0039] This embodiment uses a structure in which two hydraulic cylinders are linked, and is matched with a reasonably arranged oil circuit control system, so that the first hydraulic cylinder 10 can drive the extension and retraction of the second hydraulic cylinder 20, and can also independently control the extension and retraction of the second hydraulic cylinder 20. During lifting or arm adjustment, the leveling mechanism can be adjusted more smoothly and occupy less layout space. When used in lifting or drilling machinery, the overall size of the machinery is smaller and the use is more flexible.

[0040] Example 2

[0041] This embodiment is similar to embodiment 1, except that: Figure 3As shown, the first control valve 13 and the second control valve 14 are both Y-type reversing valves, and a first hydraulic lock 23 is provided on the side of the fourth oil circuit d and the fifth oil circuit e close to the first control valve 13. When a Y-type reversing valve is used, when the Y-type reversing valve is adjusted to the middle position, the two oil circuits connected to it are interconnected with the oil return port, and the Y-type reversing valve can also play a control and adjustment effect, and the response is faster; however, since the oil circuit is connected to the oil return port in the middle position; when the first hydraulic cylinder 10 and the second hydraulic cylinder 20 are linked, the oil in the third oil circuit c may flow back to the fourth oil return port T4 through the fourth oil circuit d, affecting the linkage of the two hydraulic cylinders, so it is necessary to add a first hydraulic lock 23 to the fourth oil circuit d and the fifth oil circuit e so that they will not flow back when linked.

[0042] Example 3

[0043] This embodiment is similar to embodiment 2, except that: Figure 4 As shown, the first control valve 13 and the second control valve 14 are both proportional valves, and the fourth oil circuit d and the fifth oil circuit e are also provided with a second hydraulic lock 24 on the side close to the first control valve 13; when the first control valve 13 and the second control valve 14 use proportional valves, the oil circuits can also be adjusted and controlled.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dual hydraulic cylinder structure, comprising an oil circuit control system and a first hydraulic cylinder (10) and a second hydraulic cylinder (20) respectively connected to the oil circuit control system, wherein the first hydraulic cylinder (10) comprises a cylinder barrel (1), a piston rod (2) and a piston (3), and is characterized in that: The cylinder barrel (1) includes a first cavity (7) without a rod, a second cavity (8) with a rod, and a third cavity (9) arranged inside the piston rod (2) and having a cavity size that changes with the extension length of the piston rod (2); the first cavity (7), the second cavity (8) and the third cavity (9) are not connected to each other; the second hydraulic cylinder (20) includes a fourth cavity (21) without a rod and a fifth cavity (22) with a rod; the third cavity (9) is connected to the fourth cavity (21) or the fifth cavity (22) through the oil circuit control system; The oil circuit control system comprises a pressure oil source (12), a first control valve (13) and a second control valve (14), one end of the first control valve (13) and one end of the second control valve (14) are respectively connected to the pressure oil source (12); The other end of the first control valve (13) is connected to the first cavity (7) via a first oil circuit a, and the other end of the first control valve (13) is also connected to the second cavity (8) via a second oil circuit b; The other end of the second control valve (14) is connected to the fourth chamber (21) via a fourth oil circuit d; the other end of the second control valve (14) is also connected to the fifth chamber (22) via a fifth oil circuit e; The third cavity (9) is connected to the fourth oil circuit d through the third oil circuit c; the first oil circuit a is connected to the fifth oil circuit e through the sixth oil circuit f; The sixth oil circuit f is provided with a one-way valve (18), and the sixth oil circuit f is also connected to the first oil return port T1 through the seventh oil circuit g at the outlet side of the one-way valve (18), and the seventh oil circuit g is provided with a hydraulically controlled one-way valve (19).

2. The double hydraulic cylinder structure according to claim 1, characterized in that: The first hydraulic cylinder (10) further comprises a guide rod (4) arranged in the cylinder barrel (1); the piston rod (2) is a hollow structure; one end of the guide rod (4) is fixed on the inner bottom wall of the cylinder barrel (1); the guide rod (4) and the piston rod (2) are arranged in parallel; one end of the piston rod (2) located in the cylinder barrel (1) is connected to the piston (3); the piston rod (2) and the piston (3) are both sleeved on the guide rod (4); the inner wall of the piston (3) is connected to the guide rod (4) in a sliding and sealing manner; the outer wall of the piston (3) is connected to the inner wall of the cylinder barrel (1) in a sliding and sealing manner; the piston (3) divides the interior of the cylinder barrel (1) into a first cavity (7) and a second cavity (8); the guide rod (4) and the interior of the piston rod (2) form the third cavity (9).

3. The double hydraulic cylinder structure according to claim 2, characterized in that: A first connecting ear (5) is also provided on the outer wall of one end of the bottom of the cylinder barrel (1) of the first hydraulic cylinder (10), and a second connecting ear (6) is provided on the end of the piston rod (2) away from the first connecting ear (5).

4. The double hydraulic cylinder structure according to claim 3, characterized in that: The outer wall of the guide rod (4) is slidably and sealingly connected to the inner wall of the piston rod (2), and there is always a distance between the end of the guide rod (4) close to the second connecting ear (6) and the end of the inner cavity of the piston rod (2) close to the second connecting ear (6) to form the third cavity (9).

5. The double hydraulic cylinder structure according to claim 1, characterized in that: The cylinder barrel (1) is a structure with one end open and the other end sealed, the piston rod (2) is inserted into the interior of the cylinder barrel (1) from the open end of the cylinder barrel (1), a sealing ring is fixedly provided on the circumferential inner wall of the open end of the cylinder barrel (1), the sealing ring is sleeved on the piston rod (2) and is slidably sealed and connected to the piston rod (2).

6. The double hydraulic cylinder structure according to claim 1, characterized in that: The first oil circuit a and the second oil circuit b are both provided with a first balancing valve (15); The third oil circuit c and the fourth oil circuit d are connected to the second oil return port T2 via an overflow valve (17) at one end close to the second hydraulic cylinder, and a second balancing valve (16) is provided on the fourth oil circuit d and the fifth oil circuit e. After the third oil circuit c is connected to the fourth oil circuit d, the oil enters the second balancing valve (16).

7. The dual hydraulic cylinder structure according to claim 1, characterized in that: The first control valve (13) and the second control valve (14) are both O-type reversing valves.

8. The dual hydraulic cylinder structure according to claim 1, characterized in that: The first control valve (13) and the second control valve (14) are both Y-type reversing valves, and a first hydraulic lock (23) is provided on a side of the fourth oil circuit d and the fifth oil circuit e close to the first control valve (13).

9. The dual hydraulic cylinder structure according to claim 1, characterized in that: The first control valve (13) and the second control valve (14) are both proportional valves, and a second hydraulic lock (24) is provided on a side of the fourth oil circuit d and the fifth oil circuit e close to the first control valve (13).

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