Hydraulic damper device

Abstract

The application discloses a hydraulic buffering device, which comprises a device shell, a transmission assembly and an elastic member. The device shell is provided with a first cavity, a first through hole, a second cavity and an opening which are sequentially arranged and sequentially connected. The first cavity and the second cavity are filled with a buffer solution. The size of the first through hole is smaller than that of the first cavity. The opening penetrates the surface of the device shell. The transmission assembly comprises a main shaft, a first piston, a first plug body and a second piston. The main shaft is arranged in the first through hole, the second cavity and the opening. The first piston, the first plug body and the second piston are fixedly arranged on the main shaft. The first piston is sealed and blocked in the first cavity. The first plug body can be sealed and blocked in the first through hole or can move with the main shaft to be separated from the first through hole and enter the first cavity. The second piston is sealed and blocked in the second cavity. The elastic member can reset the transmission assembly. The hydraulic buffering device can be used to absorb a large pressure while occupying a small use and setting space.

Description

Technical Field

[0001] This invention relates to the field of hydraulic buffer technology, and more particularly to a hydraulic buffer device. Background Technology

[0002] To prevent damage to equipment caused by impacts, heavy weight, or heavy loads during use, hydraulic buffer devices are typically installed at these locations. These devices receive pressure and convert it into kinetic and thermal energy in the buffer solution, thereby absorbing at least a portion of the pressure and achieving a buffering effect.

[0003] However, since the majority of the pressure absorbed by a hydraulic buffer device is absorbed through the conversion of kinetic energy into a buffer solution, the volume of the buffer chamber into which the buffer solution enters has a significant impact on the maximum pressure that the hydraulic buffer device can absorb. Specifically, the larger the volume of the buffer chamber, the greater the maximum pressure that the hydraulic buffer device can absorb. Therefore, when a large pressure absorption capacity is required, the hydraulic buffer device suffers from the problem of having a large buffer chamber volume, resulting in a larger footprint and installation space required for the hydraulic buffer device. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic buffer device that can absorb large pressures while requiring a small footprint in terms of usage and installation space.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A hydraulic buffer device is provided, comprising:

[0007] The device housing has a first cavity, a first through hole, a second cavity, and an opening arranged in sequence and connected to each other. The first cavity and the second cavity are filled with buffer solution. In a direction perpendicular to a first direction, the size of the first through hole is smaller than the size of the first cavity. The opening penetrates the surface of the device housing. The device housing also has a buffer cavity connected to the side of the first cavity away from the second cavity. The first direction is the direction in which the first cavity, the first through hole, and the second cavity are arranged in sequence.

[0008] A transmission assembly, comprising a main shaft, a first piston, a first plug, and a second piston, wherein the main shaft passes through a first through hole, a second cavity, and the opening, with one end of the main shaft located within the first cavity and the other end located outside the device housing; the first piston, the first plug, and the second piston are all fixedly mounted on the main shaft; the first piston seals and blocks the first cavity; the first plug can seal and block the first through hole, or the first plug can move with the main shaft to disengage from the first through hole and enter the first cavity; and the second piston seals and blocks the second cavity.

[0009] An elastic element is abutted between the transmission assembly and the cavity wall of the first cavity, and the elastic element is capable of resetting the transmission assembly.

[0010] As a preferred technical solution of the hydraulic buffer device, the device housing also has a second through hole and a third cavity. Along the first direction, the second cavity, the second through hole, the third cavity and the opening are arranged in sequence and connected in sequence. The buffer solution is contained in the third cavity. Along the direction perpendicular to the first direction, the size of the second through hole is smaller than the size of the second cavity.

[0011] The transmission assembly further includes a third piston and a second plug body. The third piston and the second plug body are both fixedly disposed on the main shaft. The third piston seals and blocks the third cavity. The second plug body can seal and block the second through hole, and the second plug body can disengage from the second through hole and enter the second cavity along with the main shaft.

[0012] As a preferred technical solution of the hydraulic buffer device, the second piston is provided with a first check valve. The first check valve can open when the pressure along the second direction is greater than the pressure threshold, and allow the buffer to pass through the first check valve along the second direction, wherein the second direction is the opposite direction to the first direction.

[0013] The device housing also has a first connecting groove and a second connecting groove. The first connecting groove connects the side of the second cavity near the first through hole to the buffer cavity, and the second connecting groove connects the side of the third cavity near the second cavity to the buffer cavity.

[0014] As a preferred technical solution of the hydraulic buffer device, the device housing has a plurality of third cavities arranged sequentially along the first direction, and any two adjacent third cavities are connected through a third through hole. For a third cavity and a third through hole arranged sequentially along the first direction, the size of the third through hole is smaller than the size of the third cavity in the direction perpendicular to the first direction. The transmission assembly includes a plurality of third pistons, and each third piston is respectively sealed and plugged in each of the third cavities.

[0015] The transmission assembly further includes a third plug, which is fixedly disposed on the main shaft. The third plug can seal and block the third through hole, and the third plug can move with the main shaft toward the first cavity to disengage from the third through hole and enter the third cavity.

[0016] As a preferred technical solution of the hydraulic buffer device, a second check valve is provided on part of the third piston. The second check valve can open when the pressure along the second direction is greater than the pressure threshold, and allow the buffer to pass through the second check valve along the second direction, wherein the second direction is the opposite direction to the first direction.

[0017] The device housing also has a plurality of second communication slots corresponding to the third piston provided with the second one-way valve. The third cavity corresponding to the third piston and the third cavity adjacent to the third piston along the first direction are all provided with the second communication slots. Each second communication slot is respectively connected between the side of each third cavity near the second cavity and the buffer cavity.

[0018] As a preferred technical solution of the hydraulic buffer device, at least a portion of the second connecting groove is provided with a third check valve. The third check valve allows the buffer solution to flow from the buffer cavity through the third check valve to the third cavity, and the third check valve can prevent the buffer solution from flowing from the third cavity through the third check valve to the buffer cavity.

[0019] As a preferred technical solution of the hydraulic buffer device, for a plug, a connecting groove and a piston arranged sequentially along the first direction, the plug has a size h, the connecting groove has a size s, and when the transmission assembly is in the initial position relative to the device housing, the distance between the piston and the connecting groove is t, where t+s≤h.

[0020] As a preferred technical solution of the hydraulic buffer device, along the first direction, the transmission assembly includes a plurality of plugs, each having a size h, and along the first direction, the size h of the plurality of plugs decreases sequentially.

[0021] As a preferred embodiment of the hydraulic buffer device, the first piston includes a first cylindrical portion and a first extension portion. The outer peripheral surface of the first cylindrical portion seals against the cavity wall of the first cavity. The first extension portion connects the first cylindrical portion and the main shaft, and the first extension portion closes the gap between the first cylindrical portion and the first extension portion; and / or,

[0022] The second piston includes a second cylindrical portion and a second extension portion. The outer peripheral surface of the second cylindrical portion seals against the cavity wall of the second cavity. The second extension portion connects the second cylindrical portion and the main shaft, and the second extension portion closes the gap between the second cylindrical portion and the second extension portion; and / or,

[0023] The third piston includes a third cylindrical portion and a third extension portion. The outer peripheral surface of the third cylindrical portion is sealed against the cavity wall of the third cavity. The third extension portion is connected between the third cylindrical portion and the main shaft, and the third extension portion closes the gap between the third cylindrical portion and the third extension portion.

[0024] As a preferred embodiment of the hydraulic buffer device, the buffer cavity includes a first buffer cavity and a second buffer cavity spaced apart. The first buffer cavity is connected to the side of the first cavity away from the second cavity, and the second buffer cavity is located on the side of the first buffer cavity along the first direction, and the second buffer cavity is connected to the side of the second cavity closer to the first cavity; and / or,

[0025] The device housing includes a first part and a second part connected to each other, the second part being located on one side of the first part along the first direction, the first part having the first cavity, the first through hole and part of the buffer cavity, and the second part having the second cavity, the opening and the remaining buffer cavity.

[0026] Along a direction perpendicular to the first direction, the first part has a size d1, and the second part has a size d2, where d1 ≥ d2.

[0027] The beneficial effects of this invention are as follows:

[0028] By including a first cavity, a first through hole, and a second cavity connected in sequence in the housing of the device, and including a first piston that seals and blocks the first cavity, a first plug that can seal and block the first through hole or disengage from the first through hole, and a second piston that seals and blocks the second cavity, the pressure absorption capacity of the hydraulic buffer device can be improved without increasing the space occupied by the hydraulic buffer device in use and installation.

[0029] Specifically, when the device housing and the end of the main shaft located outside the device housing are not subjected to additional pressure along the extension direction of the main shaft, the device housing and the transmission assembly maintain a relatively stable relative position under the action of the elastic element. In other words, at this time, the transmission assembly is in its initial position relative to the device housing. When the device housing and the end of the main shaft located outside the device housing are subjected to pressure along the extension direction of the main shaft, the main shaft moves relative to the device housing in a second direction under the pressure. The first piston moves along the second direction with the main shaft, thereby pushing at least a portion of the buffer solution in the first cavity into the buffer cavity, converting part of the pressure into the kinetic energy of the at least portion of the buffer solution. At the same time, the elastic element can also convert part of the pressure into elastic deformation for absorption, thereby performing the first stage of pressure absorption. Further, when the first plug moves along the second direction with the main shaft to disengage from the first through hole, the second piston can also push at least a portion of the buffer solution in the second cavity into the first cavity, converting part of the pressure into the kinetic energy of the at least portion of the buffer solution, thereby performing the second stage of pressure absorption. Here, the aforementioned second direction is the opposite direction of the first direction.

[0030] Therefore, in the first-stage absorption process, pressure is mainly absorbed by converting pressure into the kinetic energy of the buffer solution flowing into the buffer cavity. In the second-stage absorption process, pressure is mainly absorbed by converting pressure into the kinetic energy of the buffer solution flowing into the first cavity. Thus, compared with related technologies that only absorb pressure by converting pressure into the kinetic energy of the buffer solution flowing into the buffer cavity, the hydraulic buffer device provided by this invention, having the same buffer cavity volume as related technologies, can absorb a larger maximum pressure because it can also absorb pressure by converting pressure into the kinetic energy of the buffer solution flowing into the first cavity during the second-stage absorption process. In other words, the hydraulic buffer device provided by this invention can absorb larger pressures while occupying less space in terms of usage and installation. Attached Figure Description

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0032] Figure 1This is a schematic diagram of one structure of the hydraulic buffer device described in the embodiment.

[0033] Figure 2 This is another side view of the hydraulic buffer device described in the embodiment.

[0034] Figure 3 for Figure 2 The diagram shows the structure of the hydraulic buffer device (during the first stage of absorption).

[0035] Figure 4 for Figure 2 The diagram shows the structure of the hydraulic buffer device (during the second stage of absorption).

[0036] Figure 5 for Figure 2 The diagram shows the structural structure of the device housing.

[0037] Figure 6 for Figure 2 The diagram shows the structure of the transmission component.

[0038] In the picture:

[0039] 1. Hydraulic buffer device; 10. Device housing; 10a. First part; 10b. Second part; 100a. First cavity; 100b. Second cavity; 100c. Third cavity; 101a. First through hole; 101b. Second through hole; 101c. Third through hole; 102. Opening; 103. Buffer cavity; 103a. First buffer cavity; 103b. Second buffer cavity; 104a. First connecting groove; 104b. Second connecting groove; 11. Transmission assembly; 110. Main shaft; 111. First piston; 111a. First cylindrical portion; 111b. First extension; 112. First plug body; 113. Second piston; 113a. Second cylindrical portion; 113b. Second extension; 114. Third piston; 114a. Third cylindrical portion; 114b. Third extension; 115. Second plug body; 116. Third plug body; 12. Elastic element; 131. First check valve; 132. Second check valve; 133. Third check valve. Detailed Implementation

[0040] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] like Figures 1 to 5As shown, the present invention provides a hydraulic buffer device 1, including a device housing 10, a transmission assembly 11, and an elastic element 12. The device housing 10 has a first cavity 100a, a first through hole 101a, a second cavity 100b, and an opening 102 arranged sequentially and connected to each other. The first cavity 100a and the second cavity 100b are filled with buffer solution (not shown in the figure). Along a direction perpendicular to the first direction X1, the size of the first through hole 101a is smaller than the size of the first cavity 100a. The opening 102 penetrates the surface of the device housing 10. The device housing 10 also has a buffer cavity 103 connected to the side of the first cavity 100a away from the second cavity 100b. The first direction X1 is the direction in which the first cavity 100a, the first through hole 101a, and the second cavity 100b are arranged sequentially. The transmission assembly 11 includes a main shaft 110, a first piston 111, a first plug 112, and a second piston 113. 13. The main shaft 110 passes through the first through hole 101a, the second cavity 100b, and the opening 102. One end of the main shaft 110 is located inside the first cavity 100a, and the other end of the main shaft 110 is located outside the device housing 10. The first piston 111, the first plug 112, and the second piston 113 are all fixedly installed on the main shaft 110. The first piston 111 seals and blocks inside the first cavity 100a. The first plug 112 can seal and block the first through hole 101a, or the first plug 112 can move with the main shaft 110 to disengage from the first through hole 101a and enter the first cavity 100a. The second piston 113 seals and blocks inside the second cavity 100b. The elastic member 12 abuts against the cavity wall between the transmission assembly 11 and the first cavity 100a. The elastic member 12 can reset the transmission assembly 11.

[0044] When the device housing 10 and the end of the main shaft 110 located outside the device housing 10 are not subjected to additional pressure along the extension direction of the main shaft 110, the device housing 10 and the transmission assembly 11 are maintained in a relatively stable relative position under the action of the elastic member 12. In other words, at this time, the transmission assembly 11 is in the initial position relative to the device housing 10. When the device housing 10 and the end of the main shaft 110 located outside the device housing 10 are subjected to pressure along the extension direction of the main shaft 110, the main shaft 110 moves relative to the device housing 10 in the second direction X2 under the action of pressure. The first piston 111 moves with the main shaft 110 in the second direction X2, thereby pushing at least a portion of the buffer solution in the first cavity 100a into the buffer cavity 103 through the first piston 111, so as to convert part of the pressure into the kinetic energy of the at least a portion of the buffer solution. At the same time, the elastic member 12 can also convert part of the pressure into elastic deformation for absorption, thereby performing the first stage of pressure absorption. Furthermore, when the first plug 112 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, the second piston 113 can also push at least a portion of the buffer solution in the second cavity 100b into the first cavity 100a, thereby converting part of the pressure into the kinetic energy of the at least portion of the buffer solution, thus performing a second stage of pressure absorption. Here, the aforementioned second direction X2 is the opposite direction of the first direction X1. Figure 3 The arrows in the image indicate the flow direction of a portion of the buffer solution during the first-stage absorption process. Figure 4 The arrows in the diagram indicate the flow direction of a portion of the buffer solution during the second-stage absorption process.

[0045] Therefore, in the first stage of absorption, the pressure is mainly absorbed by converting the pressure into the kinetic energy of the buffer solution flowing into the buffer cavity 103. In the second stage of absorption, the pressure is mainly absorbed by converting the pressure into the kinetic energy of the buffer solution flowing into the first cavity 100a. Therefore, compared with the hydraulic buffer device 1 in the related art, which only absorbs pressure by converting the pressure into the kinetic energy of the buffer solution flowing into the buffer cavity 103, the hydraulic buffer device 1 provided by the present invention has a buffer cavity 103 of the same volume as the hydraulic buffer device 1 in the related art. Since the hydraulic buffer device 1 provided by the present invention can also absorb pressure by converting the pressure into the kinetic energy of the buffer solution flowing into the first cavity 100a in the second stage of absorption, the maximum pressure that the hydraulic buffer device 1 provided by the present invention can absorb is greater. In other words, the hydraulic buffer device 1 provided by the present invention can be used to absorb larger pressures while occupying less space in terms of usage and installation.

[0046] Understandably, when the first plug 112 moves along the second direction X2 with the main shaft 110 and has not yet disengaged from the first through hole 101a, the second piston 113 also moves along the second direction X2 with the main shaft 110 and compresses the buffer solution located in the second cavity 100b. At this time, part of the pressure is converted into the heat energy of the buffer solution in the second cavity 100b, and the temperature of the buffer solution in the second cavity 100b rises.

[0047] In addition, since the buffer reflux requires a certain pressure, it will encounter a certain resistance during the process of pushing the transmission component 11 to reset through the elastic element 12. The reset process is relatively slow, so after the additional pressure applied to the hydraulic buffer device 1 is reduced or disappears, the hydraulic buffer device 1 can reset smoothly. The rebound effect of the hydraulic buffer device 1 is small, and the smoothness and reliability during the operation process are good.

[0048] Optionally, the elastic element 12 may include, but is not limited to, a spring or a spring sheet. When the elastic element 12 includes a spring, the elastic element 12 may be at least partially sleeved on the outer periphery of one end of the main shaft 110 located in the first cavity 100a, so that the position of the elastic element 12 in the first cavity 100a is now determined by the main shaft 110, thereby improving the stability and reliability of the reset function of the elastic element 12.

[0049] Optionally, the side of the first piston 111 near the second cavity 100b can be connected to the first plug body 112. This can prevent the formation of a gap between the first piston 111 and the first plug body 112, making the structure of the transmission assembly 11 more compact. On the other hand, the first plug body 112 can provide a certain pushing force to the first piston 111, so as to provide certain support for the first piston 111 to push the buffer solution during the movement of the first piston 111 and the first plug body 112 along the second direction X2 with the main shaft 110.

[0050] Optionally, the first piston 111 includes a first cylindrical portion 111a and a first extension portion 111b. The outer peripheral surface of the first cylindrical portion 111a seals against the cavity wall of the first cavity 100a. The first extension portion 111b connects the first cylindrical portion 111a and the main shaft 110, and the first extension portion 111b closes the gap between the first cylindrical portion 111a and the first extension portion 111b. Thus, the sealing contact area between the first piston 111 and the inner wall of the first cavity 100a can be increased by the first cylindrical portion 111a, so that the sealing contact between the first piston 111 and the first cavity 100a is better. At the same time, the gap between the first cylindrical portion 111a and the first extension portion 111b can be closed by the first extension portion 111b, so that the first piston 111 can be sealed in the first cavity 100a.

[0051] When, as in the aforementioned technical solution, the side of the first piston 111 near the second cavity 100b is connected to the first plug body 112, specifically, the side of the first cylindrical portion 111a near the second cavity 100b can be connected to the first plug body 112.

[0052] Optionally, the second piston 113 includes a second cylindrical portion 113a and a second extension portion 113b. The outer peripheral surface of the second cylindrical portion 113a seals against the cavity wall of the second cavity 100b. The second extension portion 113b connects the second cylindrical portion 113a and the main shaft 110, and the second extension portion 113b closes the gap between the second cylindrical portion 113a and the second extension portion 113b. The second cylindrical portion 113a can increase the sealing contact area between the second piston 113 and the inner wall of the second cavity 100b, so that the sealing performance of the sealing contact between the second piston 113 and the second cavity 100b is better. At the same time, the second extension portion 113b can close the gap between the second cylindrical portion 113a and the second extension portion 113b, so that the second piston 113 can be sealed in the second cavity 100b.

[0053] Optionally, the buffer chamber 103 includes a first buffer chamber 103a and a second buffer chamber 103b spaced apart. The first buffer chamber 103a is connected to the side of the first chamber 100a away from the second chamber 100b, and the second buffer chamber 103b is located on the side of the first buffer chamber 103a along the first direction X1, and the second buffer chamber 103b is connected to the side of the second chamber 100b close to the first chamber 100a. Thus, during the movement of the second piston 113 along the second direction X2 with the main shaft 110, the second piston 113 can also push a portion of the buffer oil into the second buffer chamber. In 103b, during the process of the elastic member 12 pushing the transmission assembly 11 to reset, the buffer solution in the first buffer cavity 103a can flow back into the first cavity 100a, and the buffer solution in the second buffer cavity 103b can flow back into the second cavity 100b. This avoids the problem that the buffer solution in the buffer cavity 103 is difficult to flow back quickly due to the distance between the end of the buffer cavity 103 away from the first cavity 100a and the first cavity 100a, which would make it difficult for the elastic member 12 to push the transmission assembly 11 to reset to the initial position and cause the reset of the transmission assembly 11 to take too long.

[0054] To avoid the second buffer chamber 103b being directly connected to the second cavity 100b, thus affecting the effectiveness of the process where the second piston 113 pushes a portion of the buffer solution in the second cavity 100b into the first cavity 100a when the first plug 112 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, alternatively, the volume of the second buffer chamber 103b can be made smaller so that when the first plug 112 moves along the second direction X2 with the main shaft 110 to about to disengage from the first through hole 101a, the second plug 115 pushes a portion of the buffer solution into the second buffer chamber 103b and fills the second buffer chamber 103b. Thus, when the first plug 112 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, the second piston 113 can push a portion of the buffer solution in the second cavity 100b into the first cavity 100a.

[0055] Alternatively, the second buffer cavity 103b can be connected to the side of the second cavity 100b near the first cavity 100a via the first connecting groove 104a. For a plug, a connecting groove, and a piston sequentially arranged along the first direction X1, the plug has a dimension h, the connecting groove has a dimension s, and when the transmission assembly 11 is in its initial position relative to the device housing 10, the distance between the piston and the connecting groove is t. Dimensions h, s, and t satisfy: t + s ≤ h. In other words, along the first direction X1, the first plug 112 has a dimension h, the first connecting groove... The groove 104a has a dimension s. When the transmission assembly 11 is in the initial position relative to the device housing 10, the distance between the second piston 113 and the first connecting groove 104a is t. The dimension h, dimension s, and distance t satisfy: t+s≤h, ​​where the units of dimension s, dimension h, and distance t are all mm. Thus, when the first plug 112 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, the second piston 113 can close the first connecting groove 104a to prevent the buffer solution from being partially diverted to the first connecting groove 104a when the second piston 113 further pushes the buffer solution in the second cavity 100b.

[0056] In other embodiments, the volume of the second buffer cavity 103b can be made smaller, while the dimensions s, h, and distance t of the first plug 112, the first connecting groove 104a, and the second piston 113 arranged sequentially along the first direction X1 can satisfy: t+s≤h.

[0057] Since the location for connecting to the device housing 10 away from the opening 102 in equipment requiring the installation of the hydraulic buffer device 1 typically has a larger installation space, while the location for connecting to the portion of the spindle 110 extending out of the opening 102 has a smaller installation space, the device housing 10 may optionally include a first part 10a and a second part 10b connected to each other. The second part 10b is located on one side of the first part 10a along the first direction X1. The first part 10a has a first cavity 100a, a first through hole 101a, and a partial buffer. The cavity 103, the second part 10b has a second cavity 100b, an opening 102 and the remaining buffer cavity 103. Along the direction perpendicular to the first direction X1, the first part 10a has a dimension d1 and the second part 10b has a dimension d2. The dimensions d1 and d2 satisfy: d1 > d2. Thus, the buffer cavity 103 located in the first part 10a can have a larger volume, so that when the hydraulic buffer device 1 is installed in the equipment, the utilization rate of the equipment installation space is higher, and the pressure absorption capacity of the hydraulic buffer device 1 is further improved.

[0058] In other embodiments, dimensions d1 and d2 can be made to satisfy: d1 = d2, so that the hydraulic buffer device 1 can be applied to a device in which the space at the end of the device housing 10 away from the opening 102 is approximately the same as the space at which the main shaft 110 extends out of the opening 102, and the shape and structure of the device housing 10 are simpler and easier to manufacture.

[0059] When the buffer cavity 103 includes a first buffer cavity 103a and a second buffer cavity 103b spaced apart as described above, the first part 10a may have the first buffer cavity 103a and the second part 10b may have the second buffer cavity 103b.

[0060] like Figures 2 to 6As shown, optionally, the device housing 10 also has a second through hole 101b and a third cavity 100c. Along the first direction X1, the second cavity 100b, the second through hole 101b, the third cavity 100c, and the opening 102 are arranged sequentially and connected sequentially. The third cavity 100c is filled with buffer solution. Along the direction perpendicular to the first direction X1, the size of the second through hole 101b is smaller than the size of the second cavity 100b. The transmission assembly 11 also includes a third piston 114 and a second plug 115. The third piston 114 and the second plug 115 are both fixedly disposed on the main shaft 110. The third piston 114 seals and blocks the third cavity 100c. The second plug 115 can seal and block the second through hole 101b, and the second plug 115 can disengage from the second through hole 101b with the main shaft 110 and enter the second cavity 100c. Within cavity 100b, when the device housing 10 and the end of the main shaft 110 located outside the device housing 10 are subjected to pressure along the extension direction of the main shaft 110, the main shaft 110 moves relative to the device housing 10 in the second direction X2 under the pressure. When the second plug 115 moves along the second direction X2 with the main shaft 110 to disengage from the second through hole 101b, the third piston 114 can also push at least a portion of the buffer solution in the third cavity 100c into the second cavity 100b, so as to convert part of the pressure into the kinetic energy of the at least a portion of the buffer solution. This enhances the pressure absorption capacity of the hydraulic buffer device 1 during the second stage of pressure absorption, thereby enabling the hydraulic buffer device 1 to absorb larger pressures while minimizing the space occupied by the hydraulic buffer device 1 in use and installation.

[0061] Understandably, when the second plug 115 moves along the second direction X2 with the main shaft 110 and has not yet disengaged from the second through hole 101b, the third piston 114 also moves along the second direction X2 with the main shaft 110 and compresses the buffer solution located in the third chamber 100c. At this time, part of the pressure is converted into the heat energy of the buffer solution in the third chamber 100c, and the temperature of the buffer solution in the third chamber 100c rises.

[0062] Optionally, the side of the second piston 113 near the third cavity 100c can be connected to the second plug body 115. This can prevent the formation of a gap between the second piston 113 and the second plug body 115, making the structure of the transmission assembly 11 more compact. On the other hand, the second plug body 115 can provide a certain pushing force to the second piston 113, so as to provide certain support for the second piston 113 to push the buffer solution during the movement of the second piston 113 and the second plug body 115 along the second direction X2 with the main shaft 110.

[0063] When the second piston 113 includes a second cylindrical portion 113a and a second extension portion 113b in the aforementioned technical solution, specifically, the side of the second cylindrical portion 113a near the third cavity 100c can be connected to the second piston body 115.

[0064] Optionally, the third piston 114 includes a third cylindrical portion 114a and a third extension portion 114b. The outer peripheral surface of the third cylindrical portion 114a seals against the cavity wall of the third cavity 100c. The third extension portion 114b connects the third cylindrical portion 114a and the main shaft 110, and the third extension portion 114b closes the gap between the third cylindrical portion 114a and the third extension portion 114b. The third cylindrical portion 114a can increase the sealing contact area between the third piston 114 and the inner wall of the third cavity 100c, so that the sealing performance of the sealing contact between the third piston 114 and the third cavity 100c is better. At the same time, the third extension portion 114b can close the gap between the third cylindrical portion 114a and the third extension portion 114b, so that the third piston 114 can be sealed in the third cavity 100c.

[0065] At this time, the transmission assembly 11 includes a first plug 112 and a second plug 115. In other words, the transmission assembly 11 includes multiple plugs. Along the first direction X1, the multiple plugs each have a size h. Optionally, the size h of any two plugs may be different. Thus, when the multiple plugs move along the second direction X2 with the main shaft 110, the time at which each plug disengages from its corresponding through hole is different. This allows for further subdivision of the second-stage absorption process, making the second-stage absorption process include multiple sub-absorption processes. Through these multiple sub-absorption processes, the absorbed pressure is gradually converted sequentially, avoiding the instantaneous conversion and absorption of excessive pressure during the second-stage absorption. This avoids low force conversion and absorption efficiency and prevents the hydraulic buffer device 1 from being easily subjected to large impacts in local areas. It also improves the smoothness and reliability of the hydraulic buffer device 1 during operation.

[0066] Optionally, the dimensions h of the multiple plugs can be sequentially decreased or increased along one direction, thereby facilitating the design and calculation of the multi-stage sub-absorption process performed sequentially by the hydraulic buffer device 1. For example, along the first direction X1, the dimensions h of the multiple plugs are sequentially decreased.

[0067] To further enhance the pressure conversion and absorption capacity of the hydraulic buffer device 1 during the second-stage absorption process, optionally, a first check valve 131 is provided on the second piston 113. The first check valve 131 can open when the pressure along the second direction X2 is greater than the pressure threshold, and allow the buffer solution to pass through the first check valve 131 along the second direction X2. Thus, the buffer solution can also pass through the first check valve 131 along the second direction X2, so that the pressure can be converted into the kinetic energy of the buffer solution rushing from one side of the second piston 113 to the other side of the second piston 113 along the second direction X2.

[0068] As the buffer solution flows from one side of the second piston 113 to the other side along the second direction X2, the amount of buffer solution that can flow back into the third cavity 100c during reset decreases, while the amount of buffer solution that can flow back into the second cavity 100b increases. Based on this, the device housing 10 further includes a first connecting groove 104a and a second connecting groove 104b. The first connecting groove 104a connects the side of the second cavity 100b near the first through hole 101a with the buffer cavity 103, so that excess buffer solution can enter the buffer cavity 103 through the first connecting groove 104a to avoid excess buffer solution from hindering the reset process of the transmission assembly 11. The second connecting groove 104b connects the side of the third cavity 100c near the second cavity 100b with the buffer cavity 103, so that during reset, the buffer solution can flow back into the third cavity 100c through the second connecting groove 104b.

[0069] When the second piston 113 includes a second cylindrical portion 113a and a second extension portion 113b in the aforementioned technical solution, a first one-way valve 131 is provided on the second extension portion 113b so that the buffer solution can pass through the first one-way valve 131 along the second direction X2 so that the buffer solution can flow from one side of the second extension portion 113b to the other side of the second extension portion 113b.

[0070] When the buffer cavity 103 includes a first buffer cavity 103a and a second buffer cavity 103b spaced apart as described in the aforementioned technical solution, the second connecting groove 104b can connect the side of the third cavity 100c near the second cavity 100b with the second buffer cavity 103b.

[0071] To avoid the buffer cavity 103 being directly connected to the second cavity 100b, which would affect the effectiveness of the process where the second piston 113 pushes part of the buffer solution in the second cavity 100b into the first cavity 100a when the first plug 112 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, as described in the aforementioned technical solution, when the size h of the first plug 112, the size s of the first connecting groove 104a, and the transmission assembly 11 are in their initial positions relative to the device housing 10, the distance t between the second piston 113 and the first connecting groove 104a satisfies: t+s≤h.

[0072] Optionally, the device housing 10 has a plurality of third cavities 100c. Along the first direction X1, the plurality of third cavities 100c are arranged sequentially, and any two adjacent third cavities 100c are connected through a third through hole 101c. For a third cavity 100c and a third through hole 101c arranged sequentially along the first direction X1, the size of the third through hole 101c is smaller than the size of the third cavity 100c in the direction perpendicular to the first direction X1. The transmission assembly 11 includes a plurality of third pistons 114, each third piston 114 correspondingly sealing and blocking within a third cavity 100c. The transmission assembly 11 also includes a third plug 116, which is fixedly installed... Placed on the main shaft 110, the third plug 116 can seal and block the third through hole 101c, and the third plug 116 can move with the main shaft 110 toward the first cavity 100a to disengage from the third through hole 101c and enter the third cavity 100c. By increasing the number of third cavities 100c and correspondingly increasing the number of third pistons 114, and by adding the third through hole 101c and the third plug 116, the pressure can be further converted into the kinetic energy of the buffer entering the adjacent third cavity 100c along the second direction X2 from one third cavity 100c, thereby further improving the pressure conversion absorption capacity of the hydraulic buffer device 1 during the second stage absorption process.

[0073] Optionally, the side of the third piston 114 away from the second cavity 100b can be connected to the third plug 116. This can prevent gaps from forming between the third piston 114 and the adjacent third plug 116, making the structure of the transmission assembly 11 more compact. On the other hand, the third plug 116 can provide a certain pushing force to the third piston 114, so as to provide certain support for the third piston 114 to push the buffer solution as the third piston 114 and the third plug 116 move with the main shaft 110 along the second direction X2.

[0074] When the third piston 114 includes a third cylindrical portion 114a and a third extension portion 114b in the aforementioned technical solution, specifically, the side of the third cylindrical portion 114a away from the second cavity 100b can be connected to the third plug body 116.

[0075] To further enhance the pressure conversion and absorption capacity of the hydraulic buffer device 1 during the second-stage absorption process, optionally, a second check valve 132 is provided on a portion of the third piston 114. The second check valve 132 can open when the pressure along the second direction X2 is greater than the pressure threshold, allowing the buffer solution to pass through the second check valve 132 along the second direction X2. Thus, the buffer solution can also pass through the second check valve 132 along the second direction X2, so that the pressure can be converted into the kinetic energy of the buffer solution rushing from one side of the third piston 114 to the other side of the third piston 114 along the second direction X2.

[0076] As the buffer solution flows from one side of the third piston 114 along the second direction X2 to the other side of the third piston 114 during reset, the amount of buffer solution that can flow back to the third cavity 100c adjacent to the third piston 114 along the first direction X1 decreases, while the amount of buffer solution that can flow back to the third cavity 100c corresponding to the third piston 114 increases. Therefore, the device housing 10 further includes a plurality of second communicating grooves 104b, corresponding to the third piston 114 equipped with the second one-way valve 132, the third cavity 100c corresponding to the third piston 114, and the third cavity 100c adjacent to the third piston 114 along the first direction X1. Each adjacent third cavity 100c is provided with a second connecting groove 104b. Each second connecting groove 104b is connected to the side of each third cavity 100c closest to the second cavity 100b and the buffer cavity 103. Thus, excess buffer can enter the buffer cavity 103 through the second connecting groove 104b and the third cavity 100c corresponding to the third piston 114, so as to avoid excess buffer from hindering the reset process of the transmission assembly 11. During the reset process, the buffer can flow back through the second connecting groove 104b to the third cavity 100c adjacent to the third piston 114 along the first direction X1.

[0077] When the third piston 114 includes a third cylindrical portion 114a and a third extension portion 114b in the aforementioned technical solution, the second one-way valve 132 is disposed on the third extension portion 114b so that the buffer solution can pass through the second one-way valve 132 along the second direction X2 so that the buffer solution can flow from one side of the third extension portion 114b to the other side of the third extension portion 114b.

[0078] To avoid the situation where the buffer chamber 103 is directly connected to the third chamber 100c, causing some buffer solution to be diverted through the second connecting groove 104b and directly enter the buffer chamber 103 when the third plug 116 moves along the second direction X2 with the main shaft 110 to disengage from the third through hole 101c, thus affecting the effectiveness of the process by which the third piston 114 pushes some buffer solution in the third chamber 100c to the adjacent second chamber 100b or third chamber 100c along the second direction X2, optionally, at least a portion of the second connecting groove 104b is provided with a third one-way valve 133. The third one-way valve 133 allows buffer solution to flow from the buffer chamber 103 through the third one-way valve 133 to the third chamber 100c, and prevents buffer solution from flowing from the third chamber 100c through the third one-way valve 133 to the buffer chamber 103.

[0079] Alternatively, for a plug, a communicating groove, and a piston arranged sequentially along the first direction X1, the plug has a dimension h, the communicating groove has a dimension s, and when the transmission assembly 11 is in its initial position relative to the device housing 10, the distance between the piston and the communicating groove is t, where t + s ≤ h.

[0080] Specifically, for the second plug 115, the second connecting groove 104b, and the third piston 114 arranged sequentially along the first direction X1, the second plug 115 has a dimension h, the second connecting groove 104b has a dimension s, and when the transmission assembly 11 is in the initial position relative to the device housing 10, the distance between the third piston 114 and the second connecting groove 104b is t. The dimensions h, s, and distance t satisfy: t+s≤h, ​​where the units of dimensions s, h, and distance t are all mm. Thus, when the second plug 115 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, the third piston 114 can close the second connecting groove 104b to prevent the buffer solution from being partially diverted to the second connecting groove 104b when the third piston 114 further pushes the buffer solution in the third cavity 100c.

[0081] For the third plug 116, the second connecting groove 104b, and the third piston 114 arranged sequentially along the first direction X1, the third plug 116 has a dimension h, the second connecting groove 104b has a dimension s, and when the transmission assembly 11 is in the initial position relative to the device housing 10, the distance between the third piston 114 and the second connecting groove 104b is t. The dimensions h, s, and distance t satisfy: t+s≤h, ​​where the units of dimensions s, h, and distance t are all mm. Thus, when the third plug 116 moves along the second direction X2 with the main shaft 110 to disengage from the first through hole 101a, the third piston 114 can close the second connecting groove 104b to prevent the buffer solution from being partially diverted to the second connecting groove 104b when the third piston 114 further pushes the buffer solution in the third cavity 100c.

[0082] Alternatively, while at least a portion of the second connecting groove 104b may be provided with a third check valve 133, for a plug, a connecting groove and a piston arranged sequentially along the first direction X1, the dimensions s, h and distance t may satisfy: t+s≤h. Thus, the second connecting groove 104b may be sealed by the third piston 114 to prevent the third check valve 133 from being subjected to excessive pressure from the third cavity 100c to the buffer cavity 103, which could lead to damage to the third check valve 133.

[0083] When, as described in the aforementioned technical solution, the multiple plugs of the transmission assembly 11 (i.e., the first plug 112, the second plug 115, and all the third plugs 116) along the first direction X1 each have a size h, and the size h of any two plugs is different, the second-stage absorption process can be further subdivided so that the second-stage absorption process includes multi-stage sub-absorption processes. This avoids the absorption of excessive pressure in an instant during the second-stage absorption, thus preventing low force conversion and absorption efficiency and ensuring that the hydraulic buffer device 1 is prone to large impacts in local areas. Furthermore, it improves the smoothness and reliability of the hydraulic buffer device 1 during operation. For example, along the first direction X1, the size h of all the third plugs 116, the second plug 115, and the first plug 112 decreases sequentially.

[0084] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0085] In the description of this specification, references to terms such as "an embodiment," "example," 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, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0087] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A hydraulic buffer device, characterized in that, include: The device housing has a first cavity, a first through hole, a second cavity, and an opening arranged in sequence and connected to each other. The first cavity and the second cavity are filled with buffer solution. In a direction perpendicular to a first direction, the size of the first through hole is smaller than the size of the first cavity. The opening penetrates the surface of the device housing. The device housing also has a buffer cavity connected to the side of the first cavity away from the second cavity. The first direction is the direction in which the first cavity, the first through hole, and the second cavity are arranged in sequence. A transmission assembly includes a main shaft, a first piston, a first plug, and a second piston. The main shaft passes through a first through hole, a second cavity, and the opening, with one end of the main shaft located inside the first cavity and the other end located outside the device housing. The first piston, the first plug, and the second piston are all fixedly mounted on the main shaft. The first piston seals and blocks the first cavity, the first plug seals and blocks the first through hole, and the first plug can move with the main shaft to disengage from the first through hole and enter the first cavity. The second piston seals and blocks the second cavity. An elastic element abuts against the cavity wall of the transmission assembly and the first cavity, and the elastic element is capable of resetting the transmission assembly. The device housing also has a second through hole and a third cavity. Along the first direction, the second cavity, the second through hole, the third cavity, and the opening are arranged in sequence and connected in sequence. The buffer solution is contained in the third cavity. Along the direction perpendicular to the first direction, the size of the second through hole is smaller than the size of the second cavity. The transmission assembly further includes a third piston and a second plug, both of which are fixedly mounted on the main shaft. The third piston seals and blocks the third cavity, and the second plug can seal and block the second through hole. The second plug can also detach from the second through hole and enter the second cavity along with the main shaft. The device housing also has a first connecting groove and a second connecting groove. The first connecting groove connects the side of the second cavity near the first through hole to the buffer cavity, and the second connecting groove connects the side of the third cavity near the second cavity to the buffer cavity. For a plug, a connecting groove, and a piston arranged sequentially along the first direction, the plug has a dimension h, the connecting groove has a dimension s, and when the transmission assembly is in the initial position relative to the device housing, the distance between the piston and the connecting groove is t, where t + s ≤ h.

2. The hydraulic buffer device according to claim 1, characterized in that, The second piston is provided with a first one-way valve, which can open when the pressure along the second direction is greater than a pressure threshold, and allow the buffer solution to pass through the first one-way valve along the second direction, wherein the second direction is the opposite direction to the first direction.

3. The hydraulic buffer device according to claim 1, characterized in that, The device housing has a plurality of third cavities arranged sequentially along the first direction. Any two adjacent third cavities are connected through a third through hole. For a third cavity and a third through hole arranged sequentially along the first direction, the size of the third through hole is smaller than the size of the third cavity in the direction perpendicular to the first direction. The transmission assembly includes a plurality of third pistons, each of which is respectively sealed and plugged in the third cavity. The transmission assembly further includes a third plug, which is fixedly disposed on the main shaft. The third plug can seal and block the third through hole, and the third plug can move with the main shaft toward the first cavity to disengage from the third through hole and enter the third cavity.

4. The hydraulic buffer device according to claim 3, characterized in that, The third piston is provided with a second one-way valve, which can open when the pressure along the second direction is greater than a pressure threshold, and allow the buffer solution to pass through the second one-way valve along the second direction, wherein the second direction is the opposite direction to the first direction; The device housing also has a plurality of second communication slots corresponding to the third piston provided with the second one-way valve. The third cavity corresponding to the third piston and the third cavity adjacent to the third piston along the first direction are all provided with the second communication slots. Each second communication slot is respectively connected between the side of each third cavity near the second cavity and the buffer cavity.

5. The hydraulic buffer device according to claim 4, characterized in that, At least a portion of the second connecting channel is provided with a third one-way valve, which allows buffer solution to flow from the buffer cavity through the third one-way valve to the third cavity, and the third one-way valve can prevent the buffer solution from flowing from the third cavity through the third one-way valve to the buffer cavity.

6. The hydraulic buffer device according to any one of claims 2-5, characterized in that, Along the first direction, the transmission assembly includes a plurality of plugs, each having a dimension h, and along the first direction, the dimension h of the plurality of plugs decreases sequentially.

7. The hydraulic buffer device according to any one of claims 2-5, characterized in that, The first piston includes a first cylindrical portion and a first extension portion. The outer peripheral surface of the first cylindrical portion seals against the cavity wall of the first cavity. The first extension portion connects the first cylindrical portion and the main shaft, and the first extension portion closes the gap between the first cylindrical portion and the first extension portion; and / or, The second piston includes a second cylindrical portion and a second extension portion. The outer peripheral surface of the second cylindrical portion seals against the cavity wall of the second cavity. The second extension portion connects the second cylindrical portion and the main shaft, and the second extension portion closes the gap between the second cylindrical portion and the second extension portion; and / or, The third piston includes a third cylindrical portion and a third extension portion. The outer peripheral surface of the third cylindrical portion is sealed against the cavity wall of the third cavity. The third extension portion is connected between the third cylindrical portion and the main shaft, and the third extension portion closes the gap between the third cylindrical portion and the third extension portion.

8. The hydraulic buffer device according to any one of claims 1-5, characterized in that, The buffer cavity includes a first buffer cavity and a second buffer cavity spaced apart. The first buffer cavity is connected to the side of the first cavity away from the second cavity, and the second buffer cavity is located on the side of the first buffer cavity along the first direction, and the second buffer cavity is connected to the side of the second cavity close to the first cavity. And / or, The device housing includes a first part and a second part connected to each other, the second part being located on one side of the first part along the first direction, the first part having the first cavity, the first through hole and part of the buffer cavity, and the second part having the second cavity, the opening and the remaining buffer cavity. Along a direction perpendicular to the first direction, the first part has a size d1, and the second part has a size d2, where d1 ≥ d2.

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