Buffered multi-stage servo hydraulic cylinder

Abstract

The present disclosure is a kind of buffer multistage servo hydraulic cylinder, at least including two hydraulic components, with: at least including one stage cylinder (11), two-stage cylinder (12), oil storage device (13) hydraulic cylinder body (1), two-stage cylinder (12) is arranged in one stage cylinder (11) and is communicated with it, oil storage device (13) is arranged in one stage cylinder (11) one end and is communicated with it;Servo motor (2) is arranged in one side of hydraulic cylinder body (1) and is connected with hydraulic cylinder body (1) by connecting flange (21);Oil pump (3) is arranged in one end of servo motor (2) and is connected with servo motor (2) by shaft coupling (31);At least a part of buffer device (4) is arranged in hydraulic cylinder body (1) and is located in one stage cylinder (11) one end;The buffer multistage servo hydraulic cylinder provided by the application can be used in multiple pressure chambers, high-precision position control and speed regulation are realized by servo motor, and the hydraulic cylinder is protected by buffer device.

Description

Buffered multi-stage servo hydraulic cylinder Technical Field

[0001] This invention relates to the field of hydraulic machinery, and more particularly to a buffered multi-stage servo hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are widely used in pressure equipment such as oil presses, bending machines, and riveting machines. With the development of servo motor technology, electro-hydraulic servo products have also emerged, such as traditional hydraulic stations connected to hydraulic cylinders. Multi-stage hydraulic cylinders have a compact structure and can achieve a longer stroke than single-stage hydraulic cylinders within a given installation space. Therefore, they are widely used in engineering machinery with limited space.

[0003] When the piston returns at a high speed, especially when the hydraulic cylinder is under a heavy load, the piston or piston rod may collide with the bottom of the hydraulic cylinder, which may affect the working performance of the hydraulic cylinder. In addition, the structure of multi-stage hydraulic cylinders may cause problems such as slow piston movement and instability in multiple hydraulic cylinders connected in series. Summary of the Invention

[0004] To address the aforementioned technical problems, one aspect of the present invention provides a buffered multi-stage servo hydraulic cylinder, comprising at least two stages of hydraulic components: a hydraulic cylinder body, the hydraulic cylinder body including at least a primary cylinder body, a secondary cylinder body, and an oil reservoir, the secondary cylinder body being disposed within the primary cylinder body and communicating with the primary cylinder body, the oil reservoir being disposed at one end of the primary cylinder body and communicating with the primary cylinder body; a servo motor, the servo motor being disposed on one side of the hydraulic cylinder body and connected to the hydraulic cylinder body via a connecting flange; an oil pump, the oil pump being disposed at one end of the servo motor and connected to the servo motor via a coupling, the oil pump being driven by the servo motor; and a buffer device, at least a portion of the buffer device being disposed within the hydraulic cylinder body and located at one end of the primary cylinder body; wherein, when the hydraulic cylinder body contracts, the buffer device fills the rodless chamber of the primary cylinder body. The buffered multi-stage servo hydraulic cylinder provided by the present invention allows for the combined use of multiple pressure chambers, achieving high-precision position control and speed adjustment through the servo motor, and preventing the piston from impacting the cylinder head, generating noise, affecting piston movement accuracy, or even damaging machine parts when it reaches the end of its stroke through the buffer device.

[0005] Preferably, the primary cylinder includes a cylinder barrel, a primary piston, and a primary piston rod. One end of the cylinder barrel is provided with a front cylinder connector, and the other end is provided with a rear cylinder connector. A first drive chamber is formed inside the cylinder barrel. The primary piston and the primary piston rod move within the first drive chamber. The primary piston and the primary piston rod are disposed inside the cylinder barrel and are connected. The primary piston slides with the cylinder through a sealing ring. A second drive chamber is formed inside the primary piston rod.

[0006] Preferably, the front connector of the hydraulic cylinder is provided with a first oil port, which is connected to the first drive chamber, and the rear connector of the hydraulic cylinder is provided with a second oil port, which is connected to the first drive chamber. The first oil port and the second oil port are used for oil inlet and oil return.

[0007] Preferably, the primary piston is a split-type piston.

[0008] Preferably, the secondary cylinder includes a secondary piston and a secondary piston rod, at least a portion of the secondary piston and the secondary piston rod are disposed in the second drive chamber, and the secondary piston and the secondary piston rod are connected; the secondary piston and the secondary piston rod move within the second drive chamber.

[0009] Preferably, the cylinder barrel has a first air port, and the buffer device includes a first connector, an air bladder, an air supply pipe, and an air pump. The first connector is located on one side of the rear connector of the cylinder. The air bladder is connected to the first connector. The air bladder has a second air port. The air supply pipe passes through the first air port and is sealed to the first air port. One end of the air supply pipe is connected to the second air port, and the other end is connected to the air pump. The air bladder buffers the first-stage piston. The air bladder is easily deformed under force. When the air bladder is in contact with one end of the first-stage piston, the force provided by the air bladder to the first-stage piston can be evenly applied to the end face of the first-stage piston, protecting the end face of the first-stage piston. At the same time, the even force also makes it easier to stabilize the movement state of the first-stage piston. If the air bladder is inflated during the extension stage of the hydraulic cylinder, the air bladder can also push the first-stage piston to extend, which can accelerate the pushing of the first-stage piston.

[0010] Preferably, the buffer device further includes an exhaust module, which has a through third air port and a fourth air port. The air supply pipe is a segmented pipe, with one segment connected to the third air port and the other segment connected to the fourth air port. An exhaust valve is provided inside the exhaust block, and the exhaust valve is connected to the air supply pipe. Automatic exhaust of the airbag is achieved through the exhaust valve.

[0011] Preferably, the buffer device further includes a second connector and an elastic element, the second connector being disposed on one side of the rear connector of the hydraulic cylinder, and the elastic element being disposed on the second connector; the elastic element provides a double buffering effect on the first-stage piston.

[0012] Preferably, the second connector is connected to one side of the rear connector of the hydraulic cylinder, one end of the elastic member is connected to the second connector, and the other end is connected to the first connector; the elastic member is located between the airbag and the rear connector of the hydraulic cylinder, and the elastic member and the airbag simultaneously provide a buffering effect for the first-stage piston.

[0013] Preferably, the second connector is connected to one side of the rear connector of the hydraulic cylinder, and the second connector and the elastic member surround the airbag member; the elastic member is located between the first-stage piston and the rear connector of the hydraulic cylinder, and the elastic member can provide a buffering effect on the first-stage piston before, after or simultaneously with the airbag member.

[0014] Preferably, the buffer device includes the following operating method: S1: When the first-stage cylinder extends, the air pump is started, and the air pump inflates the airbag component through the air supply pipe; S2: When the first-stage cylinder retracts, the exhaust valve is opened, and the airbag component exhausts air through the exhaust valve.

[0015] Preferably, in S2, when the first-stage piston contacts the airbag component, the exhaust valve is opened, and the rate at which the thickness of the airbag component decreases is less than the rate at which the first-stage piston decreases. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the structure of a buffered multi-stage servo hydraulic cylinder provided in an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of a hydraulic cylinder provided in an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the structure of an oil pump provided in an embodiment of the present invention;

[0020] Figure 4 is a structural schematic diagram of a primary cylinder block and a secondary cylinder block provided in an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of the structure of the hydraulic cylinder front connector provided in an embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of the structure of the hydraulic cylinder rear connector provided in an embodiment of the present invention;

[0023] Figure 7 is a schematic diagram of the front end of a first-stage piston rod according to an embodiment of the present invention;

[0024] Figure 8 is a schematic diagram of the buffer device in area A of Figure 1;

[0025] Figure 9 is a schematic diagram of the structure of an oil storage device provided in an embodiment of the present invention;

[0026] Figure 10 is a schematic diagram of the structure of a buffer device provided in an embodiment of the present invention;

[0027] Figure 11 is a schematic diagram of an elastic element provided in an embodiment of the present invention;

[0028] Figure 12 is a schematic diagram of another structure of the elastic member provided in one embodiment of the present invention. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] Example 1

[0031] As shown in Figure 1, this embodiment provides a buffered multi-stage servo hydraulic cylinder. The buffered multi-stage servo hydraulic cylinder is at least a two-stage servo hydraulic cylinder. This embodiment is described using a two-stage servo hydraulic cylinder. Specifically, the two-stage servo hydraulic cylinder includes a hydraulic cylinder body 1, a servo motor 2, an oil pump 3, and a buffer device 4.

[0032] As shown in Figure 2, the hydraulic cylinder body 1 includes a primary cylinder body 11, a secondary cylinder body 12, and an oil storage device 13. The secondary cylinder body 12 is disposed inside the primary cylinder body 11 and is connected to the primary cylinder body 11. It can be understood that the hydraulic cylinder includes two working stages: an extension stage and a retraction stage. In the extension stage, hydraulic oil enters the hydraulic cylinder and pushes the primary cylinder body 11. The primary cylinder body 11 is the main actuation stage of the secondary cylinder body 12. When the primary cylinder body 11 reaches its maximum stroke, hydraulic oil enters the primary cylinder body 11 and pushes the secondary cylinder body 12 until the secondary cylinder body 12 reaches its maximum stroke. It can be imagined that in a multi-stage hydraulic cylinder, under the action of internal oil pressure, the primary cylinder body 11 with a larger diameter extends first, and then the secondary and tertiary cylinder bodies with smaller diameters extend in sequence.

[0033] Accordingly, during the retraction phase, hydraulic oil first enters the first-stage cylinder 11 and pushes the second-stage cylinder 12. When the second-stage cylinder 12 is fully retracted, the hydraulic oil then pushes the first-stage cylinder 11. That is, the piston extension sequence in the multi-stage hydraulic cylinder is from large to small, while the retraction sequence under no-load is from small to large. It should be noted that "large" and "small" refer to the diameter of the piston.

[0034] As shown in Figure 2, the oil storage device 13 is used for replenishing and returning oil to the multi-stage hydraulic cylinder. It forms an oil storage chamber, which is connected to the first-stage cylinder body 11 through the oil replenishment valve. The servo motor 2 is located on one side of the hydraulic cylinder body 1 and is connected to the hydraulic cylinder body 1 through the connecting flange 21. As shown in Figure 3, the oil pump 3 is located at one end of the servo motor 2 and is connected to the servo motor 2 through the coupling 31. The servo motor 2 drives the oil pump 3 to control the flow direction and flow rate of a portion of the hydraulic oil.

[0035] Specifically, during the extension phase, when hydraulic oil enters the first-stage cylinder 11, it pushes the second-stage cylinder 12. The hydraulic oil in the rodless chamber is drawn into the first-stage cylinder 11 through the oil pump 3. When the hydraulic oil in the rodless chamber is insufficient, it is replenished by the oil storage device 13. The pressure in the rodless chamber is less than the pressure in the oil storage chamber, and the oil replenishment valve is opened. The oil storage device 13 replenishes hydraulic oil to the rodless chamber to push the second-stage cylinder 12 to extend quickly and complete the large mass load.

[0036] Correspondingly, during the contraction phase, the servo motor 2 drives the oil pump 3 to pump hydraulic oil into the rod chamber. The hydraulic oil in the first-stage cylinder 11 is pumped into the rod chamber and the rodless chamber. The oil replenishment valve is opened, and the hydraulic oil in the rodless chamber enters the oil storage chamber.

[0037] As shown in Figure 1, the buffer device 4 includes an internal structure and an external structure, used to protect the first-stage cylinder 11 and / or the second-stage cylinder 12.

[0038] Example 2

[0039] This embodiment uses the two-stage servo hydraulic cylinder in Embodiment 1 as an example. Furthermore, as shown in Figure 4, the first-stage cylinder body 11 includes a cylinder barrel 111, a first-stage piston 112, and a first-stage piston rod 113. The first-stage piston 112 and the first-stage piston rod 113 are disposed inside the cylinder barrel 111, and a first drive chamber 116 is formed inside the cylinder barrel 111. The first-stage piston 112 is connected to the first-stage piston rod 113, and the first-stage piston 112 slides with the cylinder through a sealing ring. A second drive chamber 117 is formed inside the first-stage piston rod 113.

[0040] Furthermore, as shown in Figure 4, one end of the cylinder barrel 111 is provided with a cylinder front connector 114, and the other end is provided with a cylinder rear connector 115. As shown in Figure 5, the cylinder front connector 114 is provided with a first oil port 118, which is connected to the first drive chamber 116. As shown in Figure 6, the cylinder rear connector 115 is provided with a second oil port 119, which is connected to the first drive chamber 116. The first-stage piston 112 and the first-stage piston rod 113 move within the first drive chamber 116.

[0041] Understandably, the first oil port 118 and the second oil port 119 are used for oil inlet and outlet. The first oil port 118 is located at the end where the rod chamber is located, and the second oil port 119 is located at the end where the rodless chamber is located. During the extension phase, hydraulic oil is discharged from the rod chamber through the first oil port 118 and pumped into the rodless chamber through the second oil port 119, driving the first-stage piston 112 and the first-stage piston rod 113 to extend. During the retraction phase, hydraulic oil is pumped into the rod chamber through the first oil port 118 and discharged from the rodless chamber through the second oil port 119, driving the first-stage piston 112 and the first-stage piston rod 113 to retract.

[0042] It should be noted that both the rod-type cavity and the rodless cavity are part of the first drive cavity 116.

[0043] It is conceivable that the first-stage piston 112 is a split piston.

[0044] Furthermore, as shown in Figure 4, the secondary cylinder 12 includes a secondary piston and a secondary piston rod 121. At least a portion of the secondary piston and the secondary piston rod 121 are disposed in the second drive chamber 117. The secondary piston and the secondary piston rod 121 are connected. During the extension phase, hydraulic oil pushes the secondary piston and the secondary piston rod 121 to extend. During the retraction phase, hydraulic oil pushes the secondary piston and the secondary piston rod 121 to retract.

[0045] Example 3

[0046] This embodiment uses the two-stage servo hydraulic cylinder in Embodiment 2 as an example. Furthermore, as shown in Figure 7, a front flange 1141 is provided on the front connector 114 of the cylinder, and a piston rod thread cap 1131 is provided at one end of the first-stage piston rod 113. As shown in Figure 8, a light shaft clamping plate 1151 is provided between the first-stage piston 112 and the rear connector 115 of the cylinder, and the light shaft clamping plate 1151 is clamped on the second-stage piston rod 121.

[0047] As shown in Figure 9, one end of the oil storage device 13 is provided with a front cover 131 for the oil replenishing valve, and a transition block 132 for the oil replenishing valve is provided on one side of the front cover 131. One side of the transition block 132 is connected to the connecting flange 21, and one side of the cylinder rear connector 115 is connected to the connecting flange 21.

[0048] Example 4

[0049] This embodiment provides a buffer device 4, which can prevent the first-stage piston 112 from hitting the rear connector 115 of the hydraulic cylinder when it reaches the end of its stroke. The buffer device 4 adopts an internal and external combined design, which can save the internal space of the hydraulic cylinder 111. As shown in Figure 10, the buffer device 4 includes a first connector, an airbag 41, an air supply pipe 42, an air pump and an exhaust module 43. The first connector and the airbag 41 are built into the hydraulic cylinder 111. The first connector is installed on the rear connector 115 of the hydraulic cylinder, and the airbag 41 is installed on the first connector.

[0050] As shown in Figure 10, the air pump and exhaust module 43 are externally mounted on the cylinder 111. The air supply pipe 42 connects the airbag component 41 and the air pump. The cylinder 111 has a first air port 1111. The air supply pipe 42 enters the cylinder 111 through the first air port 1111. One end of the airbag component 41 has a second air port 411. One end of the air supply pipe 42 is sealed to the second air port 411, and the other end is sealed to the air outlet of the air pump.

[0051] Specifically, as shown in Figure 10, the exhaust module 43 has a three-way structure with a third air port 431 and a fourth air port 432 passing through at both ends. The air supply pipe 42 has a two-section structure, namely a first branch pipe and a second branch pipe. One end of the first branch pipe is sealed and connected to the second air port 411 of the airbag component 41, and the other end is sealed and connected to the third air port 431. One end of the second branch pipe is sealed and connected to the fourth air port 432, and the other end is sealed and connected to the air outlet of the air pump.

[0052] As shown in Figure 10, an exhaust valve 433 is provided at the other end of the exhaust module 43. The exhaust valve 433 is connected to the first branch pipe and is used to discharge the gas in the airbag component 41.

[0053] This embodiment provides a method for operating the buffer device 4:

[0054] During the elongation phase, the buffer device 4 is in a deflated state;

[0055] During the contraction phase, the air pump is activated to inflate the airbag component 41. After inflation, the airbag component 41 expands. When the first-stage piston 112 reaches the end of its stroke, one side of the first-stage piston 112 comes into contact with the airbag component 41. The airbag component 41 provides a force to the first-stage piston 112 that is opposite to the direction of movement of the first-stage piston 112. The airbag component 41 can prevent the first-stage piston 112 from hitting the hydraulic cylinder rear connector 115, thus playing a buffering and protective role.

[0056] Understandably, before the first-stage piston 112 reaches the end of its stroke, the air pump stops inflating, and the airbag component 41 reaches its maximum inflation value. When the first-stage piston rod 113 extends again, the exhaust valve 433 is opened, and the gas in the airbag component 41 is automatically discharged through the exhaust valve 433.

[0057] Example 5

[0058] This embodiment provides a buffer device 4, the structure of which is the same as that described in Embodiment 4. This embodiment also provides another method of operation for the buffer device 4:

[0059] During the elongation phase, the buffer device 4 is in a deflated state;

[0060] During the contraction phase, the air pump is started first to inflate the airbag component 41. After the airbag component 41 is inflated, it expands. When the inflation volume of the airbag component 41 reaches the maximum value, the air pump stops inflating. When the first-stage piston 112 abuts against the airbag component 41, the exhaust valve 433 is opened. As the first-stage piston 112 moves closer to the rear connector 115 of the hydraulic cylinder, the thickness of the airbag component 41 gradually decreases.

[0061] Understandably, when the airbag component 41 reaches its maximum inflation value, i.e., when the thickness of the airbag component 41 is at its maximum, the first-stage piston 112 cannot move to the end of its stroke. As the exhaust valve 433 opens, the thickness of the airbag component 41 gradually decreases, and the first-stage piston 112 gradually moves to the end of its stroke. During this process, the opening and closing time and opening degree of the exhaust valve 433 are adjusted by the controller connected to the exhaust valve 433. It can be inferred that by adjusting the opening degree of the exhaust valve 433, the rate at which the thickness of the airbag component 41 decreases is adjusted. Specifically, the rate at which the thickness of the airbag component 41 decreases is less than the rate at which the first-stage piston decreases, so as to reduce the rate at which the first-stage piston decreases, ensuring that the airbag component 41 acts as a buffer for the first-stage piston 112. When the thickness of the airbag component 41 is at its minimum, the first-stage piston 112 moves to the end of its stroke.

[0062] Example 6

[0063] This embodiment provides a buffer device 4, the structure of which is the same as that described in Embodiment 4. This embodiment also provides another method of operation for the buffer device 4:

[0064] During the elongation phase, the air pump is started, and the air pump inflates the airbag component 41. After the airbag component 41 is inflated, it expands, and the hydraulic oil pump 3 enters the rodless chamber. The airbag component 41 and the hydraulic oil together push the first-stage piston 112 out. The airbag component 41 plays the role of quickly pushing out the first-stage piston rod 113.

[0065] During the contraction phase, the airbag component 41 maintains the maximum inflation volume. When the first-stage piston 112 moves to the end of its stroke, one side of the first-stage piston 112 abuts against the airbag component 41. The airbag component 41 provides a force to the first-stage piston 112 that is opposite to the direction of movement of the first-stage piston 112. The airbag component 41 can prevent the first-stage piston 112 from hitting the hydraulic cylinder rear connector 115, thus playing a buffering and protective role.

[0066] Example 7

[0067] This embodiment provides a buffer device 4, the structure of which is the same as that described in Embodiment 4. This embodiment also provides another method of operation for the buffer device 4:

[0068] During the elongation phase, the air pump is started, and the air pump inflates the airbag component 41. After the airbag component 41 is inflated, it expands, and the hydraulic oil pump 3 enters the rodless chamber. The airbag component 41 and the hydraulic oil together push the first-stage piston 112 out. The airbag component 41 plays the role of quickly pushing out the first-stage piston rod 113.

[0069] During the contraction phase, the airbag component 41 first maintains the maximum inflation volume. When the first-stage piston 112 abuts against the airbag component 41, the exhaust valve 433 is opened. As the first-stage piston 112 approaches the rear connector 115 of the hydraulic cylinder, the thickness of the airbag component 41 gradually decreases.

[0070] Understandably, when the airbag component 41 reaches its maximum inflation value, i.e., when the thickness of the airbag component 41 is at its maximum, the first-stage piston 112 cannot move to the end of its stroke. As the exhaust valve 433 opens, the thickness of the airbag component 41 gradually decreases, and the first-stage piston 112 gradually moves to the end of its stroke. During this process, the opening and closing time and opening degree of the exhaust valve 433 are adjusted by the controller connected to the exhaust valve 433. It can be inferred that by adjusting the opening degree of the exhaust valve 433, the rate at which the thickness of the airbag component 41 decreases is adjusted. Specifically, the rate at which the thickness of the airbag component 41 decreases is less than the rate at which the first-stage piston decreases, so as to reduce the rate at which the first-stage piston decreases, ensuring that the airbag component 41 acts as a buffer for the first-stage piston 112. When the thickness of the airbag component 41 is at its minimum, the first-stage piston 112 moves to the end of its stroke.

[0071] Example 8

[0072] This embodiment is illustrated using the buffer device 4 in Embodiment 4. As shown in FIG11, the buffer device 4 further includes a second connector and an elastic member 44. The second connector is disposed on one side of the hydraulic cylinder rear connector 115, and the elastic member 44 is disposed on the second connector.

[0073] Furthermore, the second connector is connected to one side of the hydraulic cylinder rear connector 115, one end of the elastic member 44 is connected to the second connector, and the other end is connected to the first connector.

[0074] Understandably, the second connector and the elastic element 44 provide a second layer of cushioning.

[0075] During the contraction phase, when the second connector abuts against the airbag 41, the elastic element 44 provides a force to the first connector that is opposite to the direction of movement of the first-stage piston 112. This force is then applied to the first-stage piston 112 through the airbag 41. The elastic element 44 can prevent the first-stage piston 112 from hitting the hydraulic cylinder rear connector 115, thus playing a buffering and protective role.

[0076] Example 9

[0077] This embodiment provides another structure for the elastic member 44, as shown in FIG12. The second connector is connected to one side of the hydraulic cylinder rear connector 115, and the second connector and the elastic member 44 surround the airbag member 41.

[0078] During the contraction phase, when the first-stage piston 112 comes into contact with the elastic element 44, the elastic element 44 provides a force to the first-stage piston 112 that is opposite to the direction of movement of the first-stage piston 112. The elastic element 44 can prevent the first-stage piston 112 from hitting the rear connector 115 of the oil cylinder, thus playing a buffering and protective role.

[0079] Understandably, the first-stage piston 112 has moved to the end of its stroke before the elastic element 44 reaches its maximum compression.

[0080] When both the airbag component 41 and the elastic component 44 are used to cushion the first-stage piston 112:

[0081] If the original length of the elastic element 44 is greater than the maximum thickness of the airbag element 41, the elastic element 44 provides cushioning before the airbag element 41.

[0082] If the original length of the elastic element 44 is less than the maximum thickness of the airbag element 41, the airbag element 41 provides cushioning before the elastic element 44.

[0083] If the original length of the elastic element 44 is equal to the maximum thickness of the airbag element 41, the elastic element 44 and the airbag element 41 provide cushioning simultaneously.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0085] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0086] Explanation of reference numerals in the attached figures:

[0087] 1. Hydraulic cylinder body

[0088] 2. Servo motor

[0089] 3. Oil pump

[0090] 4. Buffer device

[0091] 11. First-stage cylinder block

[0092] 12. Secondary cylinder block

[0093] 13. Oil storage device

[0094] 21. Connecting flange

[0095] 31. Coupling

[0096] 41. Airbag components

[0097] 42. Gas supply pipe

[0098] 43. Exhaust module

[0099] 44. Elastic element

[0100] 111. Hydraulic cylinder barrel

[0101] 112. First-stage piston

[0102] 113. First-stage piston rod

[0103] 114. Hydraulic cylinder front connector

[0104] 115. Hydraulic cylinder rear connector

[0105] 116. First driving cavity

[0106] 117. Second driving cavity

[0107] 118. First oil outlet

[0108] 119. Second oil inlet

[0109] 121. Second-stage piston rod

[0110] 131. Front cover of the oil replenishing valve

[0111] 132. Oil replenishment valve transition block

[0112] 411. Second air inlet

[0113] 431. Third air inlet

[0114] 432. Fourth air inlet

[0115] 433. Exhaust valve

[0116] 1111. First air inlet

[0117] 1131. Piston rod threaded cap

[0118] 1141. Front flange installation

[0119] 1151. Optical axis clamping plate

Claims

1. A method for operating a buffered multi-stage servo hydraulic cylinder, applied to a buffered multi-stage servo hydraulic cylinder comprising at least two stages of hydraulic components, characterized in that, The buffer multi-stage servo hydraulic cylinder includes: a hydraulic cylinder body, which includes at least a primary cylinder body, a secondary cylinder body, and an oil reservoir. The secondary cylinder body is disposed within the primary cylinder body and communicates with it. The oil reservoir is disposed at one end of the primary cylinder body and communicates with it. A servo motor is disposed on one side of the hydraulic cylinder body and connected to it via a connecting flange. An oil pump is disposed at one end of the servo motor and connected to it via a coupling. The oil pump is driven by the servo motor. A buffer device is disposed at least partly within the hydraulic cylinder body and located at one end of the primary cylinder body. When the hydraulic cylinder body contracts, the buffer device fills the rodless cavity of the primary cylinder body. A first air port is provided on the cylinder barrel of the primary cylinder body. The buffer device includes a first connecting member, an air bladder, an air supply pipe, and an air pump. The first connecting member is disposed on one side of the rear connector of the cylinder. The air bladder is connected to the first connecting member. The device has a second air port, and the air supply pipe passes through and is sealed to the first air port. One end of the air supply pipe is connected to the second air port, and the other end is connected to an air pump. The buffer device also includes an exhaust module, which has a through-type third and fourth air ports. The air supply pipe is a segmented pipe, with one segment connected to the third air port and the other segment connected to the fourth air port. An exhaust valve is installed inside the exhaust module, and the exhaust valve is connected to the air supply pipe. The buffer device further includes... The first-stage servo hydraulic cylinder includes the following working methods: S1: When the first-stage cylinder extends, the air pump is started, and the air pump inflates the airbag component through the air supply pipe. The airbag component and the hydraulic oil together push the first-stage piston to quickly extend the first-stage piston rod; S2: When the first-stage cylinder retracts, the exhaust valve is opened, and the airbag component exhausts air through the exhaust valve; wherein, when the first-stage piston contacts the airbag component, the exhaust valve is opened, and the rate at which the thickness of the airbag component decreases is less than the rate at which the first-stage piston decreases, so as to reduce the rate at which the first-stage piston is buffered.

2. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 1, characterized in that, The primary cylinder includes a cylinder barrel, a primary piston, and a primary piston rod. One end of the cylinder barrel is provided with a front cylinder connector, and the other end is provided with a rear cylinder connector. A first drive chamber is formed inside the cylinder barrel. The primary piston and the primary piston rod are disposed inside the cylinder barrel and are connected. The primary piston slides with the cylinder through a sealing ring. A second drive chamber is formed inside the primary piston rod.

3. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 2, characterized in that, The front connector of the hydraulic cylinder is provided with a first oil port, which is connected to the first drive chamber. The rear connector of the hydraulic cylinder is provided with a second oil port, which is connected to the first drive chamber.

4. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 2, characterized in that, The first-stage piston is a split-type piston.

5. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 2, characterized in that, The secondary cylinder includes a secondary piston and a secondary piston rod, at least a portion of which is disposed within the second drive chamber, and the secondary piston and the secondary piston rod are connected.

6. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 1, characterized in that, The buffer device further includes a second connector and an elastic element. The second connector is disposed on one side of the rear connector of the hydraulic cylinder, and the elastic element is disposed on the second connector.

7. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 6, characterized in that, The second connector is connected to one side of the rear connector of the hydraulic cylinder, and one end of the elastic member is connected to the second connector, while the other end is connected to the first connector.

8. The working method of the buffered multi-stage servo hydraulic cylinder according to claim 6, characterized in that, The second connector is connected to one side of the rear connector of the hydraulic cylinder, and the second connector and the elastic member surround the airbag.

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