Low-energy-consumption static pressure supporting hydraulic cylinder

Abstract

The low-energy-consumption static pressure supporting hydraulic cylinder comprises a cylinder barrel and a piston rod body arranged in the cylinder barrel, a cylinder cover and a plugging structure are installed at the two ends of the cylinder barrel respectively, the plugging structure is a base or the cylinder cover, a gap buffer area is arranged at the end, inserted into the cylinder barrel, of the cylinder cover, a gap groove is formed in the inner wall of a cavity of the cylinder cover, and the piston rod body is arranged in the gap groove. The cylinder cover is provided with a second oil channel, and the second oil channel is communicated with the gap groove through the first oil channel. The structure is novel, and the gap buffer area, the constant-pressure oil supply channel and the static pressure supporting oil cavity are organically combined, so that energy is effectively transmitted and recycled; the gap buffer area and the buffer sleeve are combined to serve as a front device for oil supplementing and pressure stabilizing of the static pressure supporting oil cavity, so that the static pressure supporting oil cavity does not need to be provided with an oil way independently, and the overall structure is simplified. In addition, due to the integrated design of the gap buffer area and the static pressure supporting oil cavity, the space is saved, the system performance is improved, and the manufacturing and maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to a low-energy-consumption static pressure support hydraulic cylinder. Background Art

[0002] As the design concept of mechanical products continues to evolve towards humanization, intelligence, miniaturization and greening, the hydraulic cylinder, as a key engineering machinery component, has an increasingly prominent demand for improving efficiency and reducing energy consumption. Green energy saving is not only an important trend in the design of the whole machine, but also a key direction for improving the performance of the hydraulic cylinder. In modern industrial applications, the hydraulic cylinder is an important actuator, and its energy utilization efficiency is directly related to the overall performance of the system.

[0003] Existing hydrostatic support structures usually require an independent oil system to provide stable high-pressure oil to ensure the support effect. However, this design not only increases the complexity and cost of the system, but also leads to higher energy loss. In addition, the traditional gap buffer structure mainly achieves the buffering effect by converting mechanical energy into internal energy. Although this method can effectively absorb the impact force, it generates a large amount of heat energy loss during the energy conversion process, further exacerbating the waste of energy. In order to solve the above problems, the present invention proposes a low-energy consumption hydrostatic support hydraulic cylinder. Summary of the invention

[0004] The object of the present invention is to provide a low-energy consumption static pressure support hydraulic cylinder to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-energy static pressure support hydraulic cylinder, comprising a cylinder barrel and a piston rod body arranged in the cylinder barrel, the two ends of the cylinder barrel are respectively installed with a cylinder head and a sealing structure, the sealing structure is a base or a cylinder head, the end of the cylinder head inserted into the cylinder barrel is provided with a gap buffer zone, a gap groove is formed on the inner wall of the cavity of the cylinder head, a second oil channel is provided on the cylinder head, the second oil channel is connected with the gap groove through a first oil channel, and a constant pressure oil supply channel, a static pressure support oil chamber and a pressure relief return oil channel are also integrated on the cylinder head, wherein the constant pressure oil supply channel is connected with the static pressure support oil chamber through a fourth oil channel, the constant pressure oil supply channel is connected with the first oil channel through the second oil channel, and the static pressure support oil chamber is connected with the pressure relief return oil channel.

[0006] As a further solution of the present invention: the piston rod body comprises a piston rod, the outer circumferential surface of the piston rod is provided with a piston located in the cylinder, and both ends of the piston are installed with a buffer sleeve, and the buffer sleeve is sleeved on the outer circumferential surface of the piston rod.

[0007] As a further solution of the present invention: at least one sealing groove is provided on the inner wall of the cavity of the cylinder head, and a sealing ring is provided inside the sealing groove.

[0008] As a further solution of the present invention: a one-way valve is provided on the opening side of the first oil passage located on the outer peripheral surface of the cylinder head.

[0009] As a further solution of the present invention: the constant pressure oil supply passage includes a plurality of third oil passages opened in the cylinder head, one of the third oil passages is connected to the second oil passage, and the plurality of third oil passages are connected to each other in sequence, and the outer peripheral surface of the cylinder head is formed with a plurality of first T-grooves corresponding one-to-one to the plurality of third oil passages.

[0010] As a further solution of the present invention: the static pressure support oil chamber includes a plurality of fifth oil passages opened in the cylinder head, and the inner wall of the cylinder head cavity is formed with a plurality of oil storage chambers with the same number as the fifth oil passages, and the oil storage chambers correspond to the fifth oil passages one by one, and the ends of the plurality of fifth oil passages away from the oil storage chambers are all provided with third T-grooves.

[0011] As a further solution of the present invention: the number of the third oil passages, the fourth oil passages and the fifth oil passages is the same, and the third oil passages, the fourth oil passages and the fifth oil passages correspond to each other one by one.

[0012] As a further solution of the present invention: a second T-shaped groove is formed at the end of the fourth oil passage away from the fifth oil passage.

[0013] As a further solution of the present invention: a seventh oil passage and an eighth oil passage are provided on the cylinder barrel, the seventh oil passage is connected with the second oil passage, and the eighth oil passage is connected with the pressure relief return oil passage.

[0014] As a further solution of the present invention: the pressure relief oil return passage includes an oil drain groove opened on the inner wall of the cylinder head cavity, and the cylinder head also integrates a sixth oil passage connected to the eighth oil passage, and the sixth oil passage is connected to the oil drain groove through the oil drain passage.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present application realizes the effective transfer and reuse of energy by organically combining the gap buffer zone, the constant pressure oil supply channel and the static pressure support oil chamber; specifically, the combined design of the gap buffer zone and the buffer sleeve serves as a pre-device for oil replenishment and pressure stabilization of the static pressure support oil chamber, so that the static pressure support oil chamber does not need to be equipped with a separate oil circuit, thereby simplifying the overall structure; in addition, the integrated design of the gap buffer zone and the static pressure support oil chamber not only saves space, but also improves system performance and reduces manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the hydraulic cylinder of the present invention;

[0018] Figure 2It is a cross-sectional schematic diagram of a hydraulic cylinder of the present invention;

[0019] Figure 3 It is a cross-sectional schematic diagram of a cylinder head of the present invention from a first viewing angle;

[0020] Figure 4 A schematic cross-sectional view of a cylinder head according to the present invention from a second viewing angle;

[0021] Figure 5 It is a schematic diagram of the constant pressure oil supply passage of the present invention;

[0022] Figure 6 It is a schematic diagram of the static pressure support oil chamber of the present invention;

[0023] Figure 7 It is a schematic diagram of the pressure relief oil return passage of the present invention;

[0024] Figure 8 It is a schematic diagram of the connection between the first oil passage and the second oil passage of the present invention;

[0025] In the figure: 1. cylinder barrel; 2. cylinder head; 3. piston rod body; 3-1. piston rod; 3-2. piston; 3-3. buffer sleeve; 4. one-way valve; 5. gap buffer zone; 6. gap groove; 7. sealing groove; 8. first oil channel; 9. second oil channel; 10. third oil channel; 11. first T-slot; 12. fourth oil channel; 13. second T-slot; 14. fifth oil channel; 15. oil storage chamber; 16. third T-slot; 17. oil drain groove; 18. oil drain channel; 19. sixth oil channel; 20. seventh oil channel; 21. eighth oil channel. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-8In an embodiment of the present invention, a low-energy static pressure support hydraulic cylinder includes a cylinder barrel 1 and a piston rod body 3 arranged in the cylinder barrel 1. The two ends of the cylinder barrel 1 are respectively installed with a cylinder cover 2 and a blocking structure. The cylinder cover 2 and the blocking structure are fixed to the ends of the cylinder barrel 1 by bolts to facilitate subsequent disassembly and assembly; the blocking structure is a base or a cylinder cover 2. In this embodiment, preferably, the blocking structure is also a cylinder cover 2, so that the two ends of the cylinder barrel 1 are both installed with cylinder covers 2, and the structures of the two cylinder covers 2 are mirror images of the same. The oil in the two cylinder covers 2 is interconnected under the action of the seventh oil passage 20 and the eighth oil passage 21 on the cylinder barrel 1; a gap buffer is provided at the end of the cylinder cover 2 inserted into the cylinder barrel 1 Zone 5, the inner diameter of the gap buffer zone 5 matches the outer diameter of the buffer sleeve 3-3, so that the buffer sleeve 3-3 can smoothly enter the interior of the gap buffer zone 5 when moving toward the side of the cylinder head 2, and at the same time, the oil can also enter the gap groove 6 formed on the inner wall of the cylinder head 2 cavity through the gap between the buffer sleeve 3-3 and the gap buffer zone 5. This process can continuously replenish oil for the static pressure support oil chamber, and use the pressure oil of the buffer structure as the oil replenishment and pressure stabilization pre-device of the static pressure support oil chamber, so that one action and one pressure replenishment and pressure stabilization are achieved, the mechanical action is maintained, and the structural reliability is guaranteed; at this time, the oil pressure and energy formed by the buffer can be converted into energy for the static pressure support, and continuously replenished during the reciprocating motion. And stabilize the support oil pressure, through mechanical operation and buffer oil to form the role of oil pump, supply high-pressure oil to the pressure-reducing support, realize the pressure oil in the cylinder 1 is supplied to the static pressure support oil chamber, avoid the static pressure support separate oil circuit supply, achieve the effect of energy saving, and can also effectively avoid the buffer temperature rise, so that the system energy and buffer oil can be reused, not only improve the performance of the oil cylinder, but also save energy consumption; the inner diameter of the gap groove 6 is larger than the outer diameter of the piston rod 3-1, and a gap is formed between the outer circumference of the piston rod 3-1 and the inner circumference of the cylinder head 2, and the gap is used for oil to flow through, and the oil is throttled through the gap, while the passage of the pressure oil is increased to achieve energy saving. Flow and buffering; a sealing groove 7 is provided on the inner wall of the cavity of the cylinder head 2, and a sealing ring is provided inside the sealing groove 7, which can effectively prevent the oil in the low-energy static pressure support hydraulic cylinder from leaking out and maintain the static pressure support oil. A second oil passage 9 is provided on the cylinder head 2, and the second oil passage 9 is connected with the clearance groove 6 through the first oil passage 8. The first oil passage 8 is located on the opening side of the outer peripheral surface of the cylinder head 2 and is provided with a one-way valve 4. A constant-pressure oil supply passage, a static pressure support oil chamber and a pressure relief return oil passage are also integrated on the cylinder head 2, wherein the constant-pressure oil supply passage is connected to the static pressure support oil chamber through a fourth oil passage 12, the constant-pressure oil supply passage is connected to the first oil passage 8 through the second oil passage 9, and the static pressure support oil chamber is connected to the pressure relief return oil passage.

[0028] Specifically, when the oil in the cylinder 1 is squeezed by the piston 3-2 and the buffer sleeve 3-3, the oil first passes through the gap between the buffer sleeve 3-3 and the cylinder head 2, and then passes through the gap between the piston rod 3-1 and the cylinder head 2 and then enters the interior of the gap groove 6. At this time, the oil enters the interior of the first oil passage 8 for diversion, dividing the oil into multiple oil passages. When the blocking structure is the cylinder head 2, a part of the oil passes through the first oil passage 8 directly into the one-way valve 4 or the seventh oil passage 20 on the cylinder 1. The oil entering the one-way valve 4 or the seventh oil passage 20 flows to the other side of the cylinder 1, and a part of the remaining oil enters the constant pressure valve 4 through the second oil passage 9. Oil supply channel, when the blocking structure is a base, since the other side of the seventh oil channel 20 is closed, the oil enters the external oil circuit through the one-way valve 4, and the subsequent oil direction is all existing technology, which will not be elaborated here. The oil entering the constant pressure oil supply channel enters the static pressure support oil chamber at the same time after pressure stabilization. The pressure stabilization support is achieved through structural design and hydraulic oil circuit design. The interaction between the gap buffer zone 5, the constant pressure oil supply channel and the static pressure support oil chamber forms an energy-saving interactive support mode in the low-energy static pressure support hydraulic cylinder. By integrating the dual performance characteristics of buffering and static pressure support on the cylinder head 2, dynamic pressure linkage, energy saving and consumption reduction, and improved energy utilization.

[0029] See also Figure 2 In one embodiment, in this embodiment, preferably, the piston rod body 3 includes a piston rod 3-1, and the outer circumferential surface of the piston rod 3-1 is provided with a piston 3-2 located in the cylinder 1, and both ends of the piston 3-2 are installed with a buffer sleeve 3-3, and the buffer sleeve 3-3 is sleeved on the outer circumferential surface of the piston rod 3-1. Furthermore, the buffer sleeve 3-3 is radially fixed on the piston rod 3-1, but can float axially, and plays a buffering role through the relative positions of the buffer sleeve 3-3, the piston rod 3-1 and the cylinder head 2.

[0030] See also Figure 4-5 In one embodiment, in this embodiment, preferably, the constant pressure oil supply passage includes a plurality of third oil passages 10 opened in the cylinder head 2, wherein one third oil passage 10 is connected to the second oil passage 9, and the plurality of third oil passages 10 are connected to each other in sequence, and the outer peripheral surface of the cylinder head 2 is formed with a plurality of first T-shaped grooves 11 corresponding one to one to the plurality of third oil passages 10.

[0031] Specifically, the number of the third oil passages 10 is not limited. In the present embodiment, preferably, the number of the third oil passages 10 is four, and the four third oil passages 10 are distributed in a "mouth" shape. Secondly, a plug can be installed inside the first T-slot 11. The plug ensures processing and subsequent oil pressure measurement of the oil circuit, and can ensure that the oil in the third oil passage 10 will not flow out in the reverse direction through the first T-slot 11. In addition, a one-way valve can also be installed here to prevent the oil from flowing out in the reverse direction, thereby ensuring the static pressure support pressure.

[0032] See also Figure 6 In one embodiment, in this embodiment, preferably, the static pressure support oil chamber includes a plurality of fifth oil passages 14 opened in the cylinder head 2, and the inner wall of the cavity of the cylinder head 2 is formed with a plurality of oil storage chambers 15 having the same number as the fifth oil passages 14, and the oil storage chambers 15 correspond one-to-one to the fifth oil passages 14, and the ends of the plurality of fifth oil passages 14 away from the oil storage chambers 15 are all provided with third T-slots 16.

[0033] Specifically, the hydrostatic support oil chamber does not need to set up a separate oil circuit, which can simplify the structure and cost, and the number of the fifth oil passages 14 is not limited. In this embodiment, preferably, the number of the fifth oil passages 14 is four, and the four fifth oil passages 14 are symmetrically distributed in a "four-leaf clover" shape, so that the supporting performance of the hydrostatic support oil chamber is improved. Secondly, the four oil storage chambers 15 connected to the four fifth oil passages 14 form a relatively closed oil storage space with the surface of the piston rod 3-1, avoiding direct contact between the piston rod 3-1 and the surface of the cylinder head 2 during sliding, thereby reducing the wear of the piston rod 3-1 and the cylinder head 2.

[0034] See also Figure 3-6 In one embodiment, in this embodiment, preferably, the number of the third oil passage 10, the fourth oil passage 12 and the fifth oil passage 14 is the same, and the third oil passage 10, the fourth oil passage 12 and the fifth oil passage 14 correspond to each other one by one. In order to ensure the stability of the static pressure supporting oil, the third oil passage 10, the fourth oil passage 12 and the fifth oil passage 14 are all set to be slender, which not only replenishes the oil but also stabilizes the supporting oil pressure.

[0035] See also Figure 4-6 In one embodiment, in this embodiment, preferably, a second T-slot 13 is provided at the end of the fourth oil passage 12 away from the fifth oil passage 14, and a plug or a one-way valve can be installed at the second T-slot 13 to ensure that the oil in the fourth oil passage 12 does not flow out in the reverse direction through the second T-slot 13.

[0036] See also Figure 7-8 In one embodiment, in this embodiment, preferably, a seventh oil passage 20 and an eighth oil passage 21 are provided on the cylinder barrel 1, the seventh oil passage 20 is connected to the second oil passage 9, and the eighth oil passage 21 is connected to the pressure relief return oil passage. Further, the seventh oil passage 20, the first oil passage 8 and the second oil passage 9 on the cylinder barrel 1 are all high-pressure oil passages, and the pressure relief return oil passage and the eighth oil passage 21 are low-pressure oil passages. The high-pressure oil passage is used to provide stable oil replenishment and support for the oil in the static pressure support oil chamber, and the oil is refluxed through the low-pressure oil circuit, and the high and low pressure oils are used to supply the static pressure support oil chamber, so that both pressure replenishment and oil replenishment are achieved, and the energy utilization rate is improved, and the distinction between high and low pressure oil circuits is more conducive to energy saving.

[0037] See also Figure 7-8In one embodiment, in this embodiment, preferably, the pressure relief return oil passage includes an oil drain groove 17 opened on the inner wall of the cylinder head 2 cavity, and the cylinder head 2 is also integrated with a sixth oil passage 19 connected to the eighth oil passage 21. The sixth oil passage 19 is connected to the oil drain groove 17 through the oil drain passage 18. Further, the oil in the oil storage space can be drained through the oil drain groove 17, the oil drain passage 18 and the sixth oil passage 19 in sequence. At this time, the oil enters the interior of the eighth oil passage 21, thereby completing the interconnection of the oil in the cylinder heads 2 on both sides.

[0038] The working principle and use process of the present invention are as follows: after the hydraulic cylinder enters the hydraulic oil and acts, the oil pushes the piston 3-2 and the buffer sleeve 3-3 at the right end into the gap buffer zone 5 of the cylinder head 2, and forms high-pressure oil after buffering and throttling. The high-pressure oil first passes through the gap between the buffer sleeve 3-3 and the cylinder head 2, and then passes through the gap between the piston rod 3-1 and the cylinder head 2 and then enters the interior of the gap groove 6. At this time, the high-pressure oil enters the interior of the first oil channel 8 for diversion. A plug-in one-way valve 4 is arranged on the oil channel of the first oil channel 8 to ensure that part of the high-pressure oil can flow into the second oil channel 9 in one direction and then enter the constant-pressure oil supply channel. After the fluctuating pressure oil stabilizes, it becomes a relatively constant pressure oil and enters the static pressure support oil chamber, thereby forming a static pressure support force. At the same time, if it is a double-cylinder head and double-rod cylinder, the high-pressure oil circuit and the low-pressure oil circuit can be connected under the action of the seventh oil channel 20 and the eighth oil channel 21, which is more conducive to energy saving and buffering. In addition, the adjustment and design of the buffering and static pressure support performance can be achieved through the differential design of the constant-pressure oil supply channel.

[0039] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0040] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A low-energy static pressure support hydraulic cylinder, comprising a cylinder barrel (1) and a piston rod body (3) arranged in the cylinder barrel (1), wherein two ends of the cylinder barrel (1) are respectively provided with a cylinder cover (2) and a blocking structure, wherein the blocking structure is a base or a cylinder cover (2), and is characterized in that: A clearance buffer (5) is provided at the end of the cylinder head (2) inserted into the cylinder barrel (1), a clearance groove (6) is formed on the inner wall of the cavity of the cylinder head (2), a second oil passage (9) is provided on the cylinder head (2), the second oil passage (9) is connected to the clearance groove (6) through a first oil passage (8), and a constant pressure oil supply passage, a static pressure support oil chamber and a pressure relief return oil passage are also integrated on the cylinder head (2), wherein the constant pressure oil supply passage is connected to the static pressure support oil chamber through a fourth oil passage (12), the constant pressure oil supply passage is connected to the first oil passage (8) through a second oil passage (9), and the static pressure support oil chamber is connected to the pressure relief return oil passage.

2. The low-energy static pressure support hydraulic cylinder according to claim 1, characterized in that: The piston rod body (3) comprises a piston rod (3-1), the outer circumferential surface of the piston rod (3-1) is provided with a piston (3-2) located in the cylinder (1), and both ends of the piston (3-2) are installed with a buffer sleeve (3-3), and the buffer sleeve (3-3) is sleeved on the outer circumferential surface of the piston rod (3-1).

3. The low-energy static pressure support hydraulic cylinder according to claim 1, characterized in that: At least one sealing groove (7) is provided on the inner wall of the cavity of the cylinder cover (2), and a sealing ring is provided inside the sealing groove (7).

4. The low-energy static pressure support hydraulic cylinder according to claim 1, characterized in that: A one-way valve (4) is provided on the opening side of the first oil passage (8) located on the outer peripheral surface of the cylinder head (2).

5. The low-energy static pressure support hydraulic cylinder according to claim 1, characterized in that: The constant pressure oil supply passage comprises a plurality of third oil passages (10) opened in the cylinder head (2), wherein one of the third oil passages (10) is connected to the second oil passage (9), and the plurality of third oil passages (10) are connected to each other in sequence, and the outer peripheral surface of the cylinder head (2) is formed with a plurality of first T-shaped grooves (11) corresponding one to one to the plurality of third oil passages (10).

6. The low-energy static pressure support hydraulic cylinder according to claim 5, characterized in that: The static pressure support oil chamber comprises a plurality of fifth oil passages (14) opened in the cylinder head (2); a plurality of oil storage chambers (15) having the same number as the fifth oil passages (14) are formed on the inner wall of the chamber of the cylinder head (2); the oil storage chambers (15) correspond to the fifth oil passages (14) one by one; and the ends of the plurality of fifth oil passages (14) away from the oil storage chambers (15) are all provided with third T-shaped grooves (16).

7. The low-energy static pressure support hydraulic cylinder according to claim 6, characterized in that: The number of the third oil passages (10), the fourth oil passages (12) and the fifth oil passages (14) is the same, and the third oil passages (10), the fourth oil passages (12) and the fifth oil passages (14) correspond one to one.

8. The low-energy static pressure support hydraulic cylinder according to claim 7, characterized in that: A second T-shaped groove (13) is provided at the end of the fourth oil passage (12) away from the fifth oil passage (14).

9. The low-energy static pressure support hydraulic cylinder according to claim 1, characterized in that: The cylinder barrel (1) is provided with a seventh oil passage (20) and an eighth oil passage (21); the seventh oil passage (20) is connected to the second oil passage (9), and the eighth oil passage (21) is connected to the pressure relief oil return passage.

10. The low-energy static pressure support hydraulic cylinder according to claim 9, characterized in that: The pressure relief oil return passage comprises an oil drain groove (17) provided on the inner wall of the cylinder head (2) cavity. A sixth oil passage (19) communicating with an eighth oil passage (21) is also integrated in the cylinder head (2). The sixth oil passage (19) is communicated with the oil drain groove (17) via an oil drain passage (18).

Images