Hydraulic buffer device and hydraulic control system

Abstract

The present disclosure provides a hydraulic buffer device and a hydraulic control system, which belong to the field of hydraulic transmission technology. The hydraulic buffer device includes a base, a piston assembly and an elastic member; the piston assembly includes a sliding rod, a first piston and a second piston, the first piston and the second piston are respectively connected to the two ends of the sliding rod, and the first piston is movably located in the first cavity, and the second piston is movably located in the second cavity, and the moving direction of the first piston and the second piston is the same as the axial direction of the sliding rod; if the piston assembly is in the first position, the sliding rod and the interior of the base form a first channel and a second channel, and the first channel is connected to the first cavity. The second channel is connected to the second cavity. The elastic member is located in the second cavity, and the elastic member is located between the second end of the sliding rod and the second piston, and the two ends of the elastic member are respectively against the inner wall of the second piston and the base. The present disclosure can improve the service life of the actuator through the hydraulic buffer device.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of hydraulic transmission, and in particular relates to a hydraulic buffer device and a hydraulic control system. Background Art

[0002] Hydraulic transmission is a transmission method that uses pressurized liquid as the working medium for energy conversion and control. Using hydraulic transmission technology in machinery can effectively simplify the structure of the machine, reduce its weight, reduce material consumption, and improve work efficiency and reliability.

[0003] In related art, a hydraulic transmission system generally includes a power element, an actuator, and a control element. The power element's oil outlet is connected to the control element's oil inlet, the control element's first working oil port is connected to the actuator's oil inlet, the control element's second working oil port is connected to the actuator's oil return port, and the control element's oil return port is connected to the power element's oil return port. When the hydraulic transmission system is activated, the power element supplies high-pressure oil to the actuator through the control element, enabling the actuator to operate. When the hydraulic transmission system is shut down, the power element stops supplying high-pressure oil to the actuator, causing the actuator to cease operation. When the hydraulic transmission system is activated, pressure in the actuator builds up instantaneously, causing a shock to the actuator. Furthermore, when the hydraulic system is shut down, the actuator has significant inertia, and the instantaneous closure of the hydraulic oil circuit can cause a shock to the hydraulic transmission system, seriously shortening its service life. To reduce the impact force during the opening and closing of the actuator, separate slow-start and slow-close valves are typically installed in the hydraulic transmission system. These valves are connected between the actuator and the control element.

[0004] However, since the slow-start valve and the slow-close valve are separately connected between the actuator and the control element, this makes the hydraulic transmission system complicated and increases the volume of the hydraulic transmission system. Summary of the Invention

[0005] The embodiments of the present disclosure provide a hydraulic buffer device and a hydraulic control system that can simplify the structure of the transmission system. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a hydraulic buffer device, which includes a base, a piston assembly and an elastic member; the interior of the base is provided with a first cavity and a second cavity isolated from each other; the piston assembly includes a sliding rod, a first piston and a second piston, the first piston is connected to the first end of the sliding rod, the second piston is located between the first end and the second end of the sliding rod, and the second piston is connected to the outer wall of the sliding rod, and the first piston is located in the first cavity, and the second piston is located in the second cavity; the piston assembly is configured to move along the axis direction of the sliding rod between a first position and a second position, and when the piston assembly is in the first position, the sliding rod and the interior of the base A first channel and a second channel are formed, and the first channel is connected to the first cavity, and the second channel is connected to the second cavity. The first end of the first channel and the first end of the second channel are respectively used to communicate with the oil port of the power element, and the second end of the first channel and the second end of the second channel are respectively used to communicate with the oil port of the actuator; when the piston assembly is in the second position, the first channel and the second channel are not formed inside the sliding rod and the base; the elastic member is located in the second cavity, and the elastic member is located between the second end of the sliding rod and the second piston, the elastic member is sleeved on the sliding rod, and the two ends of the elastic member are respectively against the second piston and the inner wall of the base.

[0007] In another embodiment of the present disclosure, the outer wall of the base has a first oil port, a second oil port, a third oil port and a fourth oil port, and the first oil port, the second oil port, the third oil port and the fourth oil port are located between the first cavity and the second cavity, the first oil port is connected to the first cavity, and the second oil port is connected to the second cavity; the sliding rod has a first through hole and a second through hole arranged at intervals in the axial direction, and when the piston assembly is in the first position, the first through hole is respectively connected to the first oil port and the third oil port to form the first channel, and the second through hole is respectively connected to the second oil port and the fourth oil port to form the second channel.

[0008] 18. The oil pump of claim 17, wherein the oil pump has a first end in contact with the oil pan of the second end cap and a second end cap disposed in the oil pan of the second end cap. The injector has a first end and a second end, and the injector has a second end, and the oil pan is a third end. The injector has a second end and a second end cap disposed in the oil pan of the second end cap.

[0009] In another implementation of the present disclosure, the first vertical segment and the second vertical segment are coaxially arranged, and the axial direction of the first vertical segment is perpendicular to the axial direction of the sliding rod, and the inner diameters of the first vertical segment, the first through hole and the second vertical segment are the same; the third vertical segment and the fourth vertical segment are coaxially arranged, the axial direction of the third vertical segment is perpendicular to the axial direction of the sliding rod, and the inner diameters of the third vertical segment, the second through hole and the fourth vertical segment are the same.

[0010] In another embodiment of the present disclosure, the first cavity has a first inner wall and a second inner wall relative to each other in the moving direction of the piston assembly, and the direction from the first inner wall to the second inner wall is the direction from the second piston to the first piston; if the piston assembly is in the first position, the first piston is against the first inner wall.

[0011] In another embodiment of the present disclosure, the outer wall of the base body also has a fifth oil port, which is connected to the first channel and the first cavity; the hydraulic buffer device also includes a first adjusting plug, which is movably connected to the fifth oil port, and the first adjusting plug is used to adjust the flow area between the first cavity and the first channel.

[0012] In another embodiment of the present disclosure, the first cavity has a first inner wall and a second inner wall relative to each other in the moving direction of the piston assembly, and the direction from the first inner wall to the second inner wall is the direction from the second piston to the first piston; if the piston assembly is in the second position, there is a gap between the first piston and the second inner wall, and the fifth oil port is located in the gap.

[0013] In another embodiment of the present disclosure, the outer wall of the base body further has a sixth oil port, which is connected to the second channel and the second cavity; the hydraulic buffer device also includes a second adjusting plug, which is movably connected to the sixth oil port, and the second adjusting plug is used to adjust the flow area between the second cavity and the second channel.

[0014] In yet another implementation of the present disclosure, the hydraulic buffer device includes an anti-rotation key, the anti-rotation key is connected to the outer wall of the slide rod, and the anti-rotation key is clearance-fitted with the base.

[0015] In another embodiment of the present disclosure, a hydraulic control system is further provided, which includes a power element, an actuator, a hydraulic buffer device and a control element, and the hydraulic buffer device is the hydraulic buffer device described above; the oil outlet of the power element is connected to the oil inlet of the control element, the first working oil port of the control element is connected to the first cavity in the hydraulic buffer device, and the first cavity is connected to the oil inlet of the actuator, the oil outlet of the actuator is connected to the second cavity in the hydraulic buffer device, the second cavity is connected to the second working oil port of the control element, and the oil return port of the control element is connected to the oil return port of the power element.

[0016] The technical solutions provided by the embodiments of the present disclosure have the following beneficial effects:

[0017] When the hydraulic buffer device provided by the embodiment of the present disclosure is used in a hydraulic control system, since the hydraulic buffer device includes a base, a piston assembly and an elastic member, and the interior of the base has a first cavity and a second cavity that are isolated from each other, the first cavity can be connected to the oil inlet of the actuator, and the second cavity can be connected to the oil return port of the actuator, that is, the first cavity is used as the oil inlet chamber of the actuator, and the second cavity is used as the oil return chamber of the actuator, so that the base can be connected to the hydraulic control system.

[0018] When the actuator is started, the first cavity serves as the oil inlet chamber, and the first cavity is connected to the power element. There will be pressurized oil in the first cavity, so that the pressurized oil will push the first piston toward the second piston. Since the elastic member is sleeved on the sliding rod, the two ends of the elastic member respectively abut against the inner wall of the second piston and the base, so that the first piston and the second piston will move slowly. Since the piston assembly has a first position and a second position, when the piston assembly slowly moves to the first position, at this time, since the sliding rod and the interior of the base form the first channel and the second channel, the pressurized oil output by the power element will enter the actuator through the first channel, driving the actuator to perform the corresponding action. At the same time, the return oil of the actuator will be recovered to the power element through the second channel.

[0019] When the actuator is closed, the power element no longer supplies pressurized oil to the first oil channel. At this point, the elastic member pushes the slide rod slowly from the first position to the second position. As the slide rod moves, the first and second channels are slowly disconnected, creating a damping effect, causing the slide rod to slowly move until the first and second channels are disconnected. Simultaneously, the first piston squeezes the pressurized oil in the first chamber, forcing it to drain through the corresponding drain port. This slowly closes the actuator until it locks.

[0020] That is to say, in the embodiment of the present disclosure, since the piston assembly moves slowly inside the base, and the first channel and the second channel are also slowly connected or slowly staggered and cut off, the pressure oil entering the actuator also flows slowly or is slowly recovered, which greatly reduces the impact force of the actuator when opening and closing, thereby extending the service life of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 is a structural schematic diagram of a hydraulic buffer device provided in an embodiment of the present disclosure;

[0023] Figure 2 yes Figure 1 Cross-sectional view along AA direction;

[0024] Figure 3 yes Figure 1 Cross-sectional view along the BB direction;

[0025] Figure 4 It is a structural diagram of the hydraulic control system provided by an embodiment of the present disclosure.

[0026] The symbols in the figure mean the following:

[0027] 1. Base; 11. First cavity; 111. First inner wall; 112. Second inner wall; 12. Second cavity;

[0028] 2. Piston assembly; 21. Sliding rod; 22. First piston; 23. Second piston;

[0029] 3. Elastic parts;

[0030] 4. First adjustment plug;

[0031] 5. Second adjustment plug; 6. Anti-rotation key;

[0032] 101, first oil port; 102, second oil port; 103, third oil port; 104, fourth oil port; 105, fifth oil port; 106, sixth oil port;

[0033] 201, first channel; 2011, first vertical section; 2012, second vertical section; 2013, first horizontal section;

[0034] 202, second channel; 2021, third vertical section; 2022, fourth vertical section; 2023, second horizontal section;

[0035] 211, first through hole; 212, second through hole;

[0036] 100. Power element; 200. Actuator; 300. Hydraulic buffer device; 400. Control element. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0038] The embodiment of the present disclosure provides a hydraulic buffer device, such as Figure 1 As shown, the hydraulic buffer device comprises a base body 1, a piston assembly 2 and an elastic member 3. The base body 1 has a first cavity 11 and a second cavity 12 which are isolated from each other.

[0039] The piston assembly 2 includes a slide rod 21, a first piston 22 and a second piston 23. The first piston 22 is connected to the first end of the slide rod 21, the second piston 23 is located between the first end and the second end of the slide rod 21, and the second piston 23 is connected to the outer wall of the slide rod 21. The first piston 22 is located in the first cavity 11, and the second piston 23 is located in the second cavity 12.

[0040] The piston assembly 2 is configured to move along the axis of the slide rod 21 between a first position and a second position. When the piston assembly 2 is in the first position, the slide rod 21 and the interior of the base body 1 form a first channel 201 and a second channel 202. The first channel 201 communicates with the first cavity 11, and the second channel 202 communicates with the second cavity 12. The first end of the first channel 201 and the first end of the second channel 202 are respectively connected to the oil port of the power element, and the second end of the first channel 201 and the second end of the second channel 202 are respectively connected to the oil port of the actuator. When the piston assembly 2 is in the second position, the first channel 201 and the second channel 202 are not formed between the slide rod 21 and the interior of the base body 1.

[0041] The elastic member 3 is located in the second cavity 12 and between the second end of the slide rod 21 and the second piston 23 . The elastic member 3 is sleeved on the slide rod 21 , and the two ends of the elastic member 3 respectively abut against the second piston 23 and the inner wall of the base 1 .

[0042] When the hydraulic buffer device provided by the embodiment of the present disclosure is used in a hydraulic control system, since the hydraulic buffer device includes a base 1, a piston assembly 2 and an elastic member 3, and the interior of the base 1 has a first cavity 11 and a second cavity 12 that are isolated from each other, the first cavity 11 can be connected to the oil inlet of the actuator, and the second cavity 12 can be connected to the oil return port of the actuator, that is, the first cavity 11 is used as the oil inlet cavity of the actuator, and the second cavity 12 is used as the oil return cavity of the actuator, so that the base 1 can be connected to the hydraulic control system.

[0043] When the actuator is started, the first cavity 11 is used as the oil inlet chamber, and the first cavity 11 is connected to the power element. There will be pressure oil in the first cavity 11 (such as Figure 1 (arrow on the right side of the figure), so that the pressure oil will push the first piston 22 to move toward the second piston 23. Since the elastic member 3 is mounted on the slide rod 21, the two ends of the elastic member 3 respectively abut against the second piston 23 and the inner wall of the base 1. This will cause the first piston 22 and the second piston 23 to move slowly. Since the piston assembly 2 has a first position and a second position, when the piston assembly 2 slowly moves to the first position, at this time, since the slide rod 21 and the interior of the base 1 form the first channel 201 and the second channel 202, the pressure oil output by the power element will enter the actuator through the first channel 201 (see Figure 1 At the same time, the return oil of the actuator will be recovered to the power element through the second channel 202 (see Figure 1 (arrow in the second channel).

[0044] When the actuator is closed, the power element no longer supplies pressurized oil to the first oil channel. At this point, the elastic member pushes the slide rod 21 to slowly move from the first position to the second position. As the slide rod 21 moves, the first channel 201 and the second channel 202 are slowly cut off, creating a damping effect, causing the slide rod 21 to slowly move until the first channel 201 and the second channel 202 are cut off. Simultaneously, the first piston 22 squeezes the pressurized oil within the first chamber 11, allowing the pressurized oil within the first chamber 11 to slowly enter the actuator through the gradually cut first channel 201 and be discharged through the second channel 202. This allows the actuator to slowly close until it is locked.

[0045] That is to say, in the embodiment of the present disclosure, since the piston assembly 2 moves slowly inside the base 1, and the first channel 201 and the second channel 202 are also slowly connected or slowly staggered and cut off, the pressure oil entering the actuator also flows slowly or is slowly recovered, which greatly reduces the impact force of the actuator when opening and closing, thereby extending the service life of the actuator.

[0046] Of course, in the embodiment of the present disclosure, the second cavity 12 can also be used as the oil inlet chamber when the actuator is started. At this time, the second cavity 12 is connected to the power element (that is, Figure 1 The second piston 23 in the second cavity 12 is connected to the inner wall of the first piston 22 and the second cavity 12 is connected to the power element), so that the pressure oil will push the second piston 23 away from the first piston 22 (that is, toward Figure 1 The piston assembly 2 moves slowly from the second position to the first position. This process is similar to the above-mentioned use of the first cavity 11 as the oil inlet chamber, and will not be repeated here.

[0047] It can be seen that the hydraulic buffer device provided in the embodiment of the present disclosure can control the bidirectional slow opening and closing of the actuator, so that the pressure oil circuit and the return oil circuit can be freely interchanged under different working conditions, greatly simplifying the hydraulic system, simplifying the hydraulic control system, and optimizing the volume of the corresponding hydraulic system.

[0048] In this embodiment, the elastic member 3 is a telescopic spring. The telescopic spring can enable the piston assembly 2 to automatically switch from the first position to the second position.

[0049] Continue to see Figure 1 The outer wall of the base 1 has a first oil port 101, a second oil port 102, a third oil port 103 and a fourth oil port 104, and the first oil port 101, the second oil port 102, the third oil port 103 and the fourth oil port 104 are located between the first cavity 11 and the second cavity 12, the first oil port 101 is connected to the first cavity 11, and the second oil port 102 is connected to the second cavity 12.

[0050] Figure 2 yes Figure 1 The cross-sectional view along the AA direction, combined with Figure 2 The slide rod 21 has a first through hole 211 and a second through hole 212 spaced apart in the axial direction. When the piston assembly 2 is in the first position, the first through hole 211 communicates with the first oil port 101 and the third oil port 103, respectively, to form a first channel 201, and the second through hole 212 communicates with the second oil port 102 and the fourth oil port 104, respectively, to form a second channel 202.

[0051] In the above implementation, a first oil port 101, a second oil port 102, a third oil port 103, and a fourth oil port 104 are provided on the outer wall of the base body 1. The first oil port 101 can be used as an oil inlet to communicate with a power element in the hydraulic control system. The second oil port 102 can be used as an oil return port to communicate with the power element in the hydraulic control system. The third oil port 103 can be used as a first working oil port to communicate with the oil inlet of an actuator in the hydraulic control system. The fourth oil port 104 can be used as a second working oil port to communicate with the oil return port of the actuator.

[0052] At the same time, a first through hole 211 and a second through hole 212 are arranged at intervals on the slide rod 21, so that when the piston assembly 2 is in the first position, the first through hole 211 is aligned with the first oil port 101 and the third oil port 103 respectively to connect to form a first channel 201, and at the same time, the second through hole 212 is aligned with the second oil port 102 and the fourth oil port 104 respectively to connect to form a second channel 202, that is, the first channel 201 is used as the oil inlet channel of the actuator, and the second channel 202 is used as the oil return channel.

[0053] See again Figure 1 The first channel 201 includes a first vertical section 2011, a second vertical section 2012, and a first transverse section 2013. The first vertical section 2011 and the second vertical section 2012 are located on either side of the axis of the slide rod 21. The first end of the first vertical section 2011 is the first oil port 101, and the second end of the first vertical section 2011 selectively faces the first through hole 211.

[0054] The first end of the second vertical section 2012 is the third oil port 103, and the second end of the second vertical section 2012 selectively faces the first through hole 211. The first end of the first horizontal section 2013 communicates with the middle of the first vertical section 2011, and the second end of the first horizontal section 2013 communicates with the first cavity 11.

[0055] The second channel 202 includes a third vertical segment 2021 , a fourth vertical segment 2022 and a second horizontal segment 2023 . The third vertical segment 2021 and the fourth vertical segment 2022 are respectively located on both sides of the axis direction of the sliding rod 21 .

[0056] The first end of the third vertical segment 2021 is the second oil port 102, and the second end of the third vertical segment 2021 is selectively opposite the second through hole 212. The first end of the fourth vertical segment 2022 is the fourth oil port 104, and the second end of the fourth vertical segment 2022 is selectively opposite the second through hole 212. The first end of the second horizontal segment 2023 is connected to the middle portion of the third vertical segment 2021, and the second end of the second horizontal segment 2023 is selectively opposite the second cavity 12.

[0057] In the above implementation, the first channel 201 is configured as a first vertical segment 2011, a second vertical segment 2012, and a first transverse segment 2013. The first vertical segment 2011 forms the first oil port 101, which is also used to communicate with the first through-hole 211. The second vertical segment 2012 forms the third oil port 103, which is also used to communicate with the first through-hole 211. The first transverse segment 2013 is used to communicate with the first vertical segment 2011, thereby allowing the first channel 201 to communicate with the first cavity 11.

[0058] Similarly, the second channel 202 is configured as a third vertical segment 2021, a fourth vertical segment 2022, and a second transverse segment 2023. The third vertical segment 2021 forms the second oil port 102, which is also used to communicate with the second through hole 212. The fourth vertical segment 2022 forms the fourth oil port 104, which is also used to communicate with the second through hole 212. The second transverse segment 2023 is used to communicate with the third vertical segment 2021, thereby allowing the second channel 202 to communicate with the second cavity 12.

[0059] For example, when the piston assembly 2 is in the first position, the second end of the first vertical segment 2011 is opposite to and communicates with the first through hole 211, and the second end of the second vertical segment 2012 is opposite to and communicates with the first through hole 211. The second end of the third vertical segment 2021 is opposite to and communicates with the second through hole 212, and the second end of the fourth vertical segment 2022 is opposite to and communicates with the second through hole 212. In this way, the first channel 201 and the second channel 202 are formed.

[0060] See again Figure 1 Optionally, the first vertical segment 2011 and the second vertical segment 2012 are coaxially arranged, and the axial direction of the first vertical segment 2011 is perpendicular to the axial direction of the sliding rod 21, and the inner diameters of the first vertical segment 2011, the first through hole 211 and the second vertical segment 2012 are the same.

[0061] The third vertical segment 2021 and the fourth vertical segment 2022 are coaxially arranged, the axis direction of the third vertical segment 2021 is perpendicular to the axis direction of the slide rod 21, and the inner diameters of the third vertical segment 2021, the second through hole 212 and the fourth vertical segment 2022 are the same.

[0062] In the above implementation, through the above arrangement, on the one hand, the first channel 201 and the second channel 202 can be quickly formed inside the base 1. On the other hand, when the piston assembly 2 moves, the first oil port 101 and the third oil port 103 are connected to the first through hole 211, and the second oil port 102 and the fourth oil port 104 are connected to the second through hole 212, so that they can change linearly with the movement speed of the slide rod 21, that is, the flow area of ​​the first channel 201 and the second channel 202 can be slowly controlled, thereby effectively controlling the opening speed of the actuator.

[0063] Optionally, the first cavity 11 has a first inner wall 111 and a second inner wall 112 opposite to each other in the moving direction of the piston assembly 2, and the direction from the first inner wall 111 to the second inner wall 112 is the direction from the second piston 23 to the first piston 22. When the piston assembly 2 is in the first position, the first piston 22 abuts against the first inner wall 111.

[0064] In the above implementation, when the piston assembly 2 is in the first position, the first piston 22 and the first inner wall 111 are arranged to abut against each other. This prevents the piston assembly 2 from moving further forward when it reaches this position under the action of the pressurized oil. That is, during the process of moving from the second position to the first position, the corresponding end position is the first position. In other words, the first piston 22 is limited within the first cavity 11, so that the actuator can be in the open or closed state in this state, thereby locking the actuator.

[0065] Continue to see Figure 1 The outer wall of the base body 1 further has a fifth oil port 105 , which is communicated with the first channel 201 and the first cavity 11 .

[0066] The hydraulic buffer device further includes a first adjusting plug 4 , which is movably connected to the fifth oil port 105 . The first adjusting plug 4 is used to adjust the flow area between the first cavity 11 and the first channel 201 .

[0067] In the above-described implementation, a fifth oil port 105 is provided on the outer wall of the base body, which facilitates the installation of the first adjusting plug 4. By arranging the first adjusting plug 4, the flow area between the first cavity 11 and the first channel 201 can be slowly controlled by adjusting the first adjusting plug 4. In other words, the flow rate of the pressurized oil between the first cavity 11 and the first channel 201 can be slowly adjusted, thereby controlling the pressurized oil entering the actuator, thereby slowly opening or closing the actuator and reducing impact force or inertia.

[0068] That is, the fifth oil port 105 and the first regulating plug 4 can jointly form a first control oil port, so as to control the flow of the pressure oil between the base body 1 and the actuator through the first control oil port.

[0069] Optionally, when the piston assembly 2 is in the second position, there is a gap between the first piston 22 and the second inner wall 112 (eg Figure 1 L in the figure), and the fifth oil port 105 is located in the gap.

[0070] In this way, a large amount of pressure oil can be filled through the gap, so that under the action of the pressure oil, the first piston 22 can move toward the second piston 23, thereby allowing the piston assembly 2 to be transferred from the second position to the first position.

[0071] exist Figure 1 In order to simply illustrate the situation where the piston assembly 2 moves from the first position to the second position, Figure 1 The distance a is the same as the distance b, that is, the first piston 22 and the second piston 23 indicated by the dotted lines are corresponding positions when the piston assembly 2 is in the second position.

[0072] Continue to see Figure 1 The outer wall of the base body 1 further has a sixth oil port 106 , which is connected to the second channel 202 and the second cavity 12 .

[0073] The hydraulic buffer device further includes a second adjusting plug 5 , which is movably connected to the sixth oil port 106 . The second adjusting plug 5 is used to adjust the flow area between the second cavity 12 and the second channel 202 .

[0074] In the above implementation, a sixth oil port 106 is provided on the outer wall of the base body, which facilitates the installation of the second regulating plug 5. By arranging the second regulating plug 5, the flow area between the second cavity 12 and the second channel 202 can be slowly controlled by adjusting the second regulating plug 5. In other words, the flow rate of the pressurized oil between the second cavity 12 and the second channel 202 can be slowly adjusted, thereby controlling the pressurized oil entering the actuator, thereby slowly opening or closing the actuator and reducing impact force or inertia.

[0075] That is, the sixth oil port 106 and the second regulating plug 5 can jointly form a second control oil port, so as to control the flow of the pressure oil between the base body 1 and the actuator through the second control oil port.

[0076] For example, the first adjusting plug 4 and the second adjusting plug 5 have the same structure, both being adjusting bolts. Accordingly, the fifth oil port 105 and the sixth oil port 106 are threaded holes, with the first adjusting plug 4 threadedly inserted into the fifth oil port 105 and the second adjusting plug 5 threadedly inserted into the sixth oil port 106.

[0077] In this way, the flow area between the first cavity 11 and the first channel 201 and the flow area between the second cavity 12 and the second channel 202 can be easily adjusted.

[0078] For example, the fifth oil port 105 is located at the connection between the first transverse section 2013 and the first cavity 11 . The sixth oil port 106 is located at the connection between the second transverse section 2023 and the second cavity 12 .

[0079] In this way, the flow area between the first cavity 11 and the first channel 201 and the flow area between the second cavity 12 and the second channel 202 can be effectively controlled.

[0080] Optionally, the hydraulic buffer device further includes an anti-rotation key 6 , which is connected to the outer wall of the slide rod 21 and has a clearance fit with the base 1 .

[0081] In the above implementation, the main function of the anti-rotation key 6 is to prevent the base 1 and the slide bar 21 from rotating relative to each other, so as to prevent the oil port on the base 1 and the oil port on the slide bar 21 from being in a different straight line.

[0082] Exemplarily, the anti-rotation key 6 is a flat key.

[0083] In the above implementation, the anti-rotation key 6 is configured as a flat key, which facilitates installation while preventing relative rotation between the base 1 and the slide rod 21 .

[0084] For example, a keyway is provided on the outer wall of the slide bar 21, the anti-rotation key is interference-fitted in the keyway, and the anti-rotation key 6 is clearance-fitted with the base 1. In this way, the anti-rotation key can be installed through the keyway so that the anti-rotation key can move with the slide bar 21 without being separated.

[0085] Exemplarily, the piston assembly 2 further includes a plurality of seals, which are sleeved on the slide rod 21 at intervals, and the seals are in contact with the base 1 respectively.

[0086] In the above implementation, the sealing member is used to seal the sliding rod 21 and the base 1 to improve the overall sealing of the hydraulic buffer device.

[0087] Wherein, the sealing member is an annular sealing ring.

[0088] Figure 3 yes Figure 1 The cross-sectional view along the BB direction, combined with Figure 3 The base 1 is a circular cylindrical structure, and the two ends of the base 1 form a sealed first cavity 11 and a second cavity 12 respectively.

[0089] In the above implementation, the base 1 is set to a circular cylindrical structure, so that the first cavity 11 and the second cavity 12 formed can be cylindrical. In this way, the first piston 22 and the second piston 23 can be set to corresponding circular structures respectively, which facilitates the movably arrangement of the first piston 22 and the second piston 23 in the base 1 without considering the matching problem between the first piston 22 and the second piston 23 and the inner wall of the base 1, thereby simplifying the structure and improving assembly efficiency.

[0090] On the other hand, the embodiment of the present disclosure also provides a hydraulic control system, such as Figure 4 As shown, the hydraulic control system includes a power element 100, an actuator 200, a hydraulic buffer device 300 and a control element 400. The hydraulic buffer device 300 is the hydraulic buffer device mentioned above.

[0091] The oil outlet of the power element 100 is connected to the oil inlet of the control element 400, the first working oil port of the control element 400 is connected to the first cavity 11 in the hydraulic buffer device 300, and the first cavity 11 is connected to the oil inlet of the actuator 200, the oil outlet of the actuator 200 is connected to the second cavity 12 in the hydraulic buffer device 300, the second cavity 12 is connected to the second working oil port of the control element 400, and the oil return port of the control element 400 is connected to the oil return port of the power element 100.

[0092] The above hydraulic control system has the same beneficial effects as the aforementioned hydraulic buffer device, which will not be described in detail here.

[0093] For example, the power element 100 is an oil supply system comprising an oil tank and an oil pump. The oil pump's oil output port is connected to the first oil port of the hydraulic buffer device, and the oil tank is connected to the second oil port of the hydraulic buffer device. The actuator 200 is a motor or a cylinder.

[0094] The above description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A hydraulic buffer device, characterized in that: The hydraulic buffer device comprises a base (1), a piston assembly (2) and an elastic member (3); The interior of the base body (1) comprises a first cavity (11) and a second cavity (12) which are isolated from each other; The piston assembly (2) comprises a slide rod (21), a first piston (22) and a second piston (23), wherein the first piston (22) is connected to the first end of the slide rod (21), the second piston (23) is located between the first end and the second end of the slide rod (21), and the second piston (23) is connected to the outer wall of the slide rod (21), and the first piston (22) is located in the first cavity (11), and the second piston (23) is located in the second cavity (12); The piston assembly (2) is configured to move between a first position and a second position along the axial direction of the slide rod (21); when the piston assembly (2) is located at the first position, the slide rod (21) and the interior of the base (1) form a first channel (201) and a second channel (202); the first channel (201) is communicated with the first cavity (11), and the second channel (202) is communicated with the second cavity (12); the first end of the first channel (201) and the first end of the second channel (202) are respectively used to communicate with the oil port of the power element, and the second end of the first channel (201) and the second end of the second channel (202) are respectively used to communicate with the oil port of the actuator; When the piston assembly (2) is located at the second position, the sliding rod (21) and the interior of the base body (1) do not form a first channel (201) and a second channel (202); The elastic member (3) is located in the second cavity (12), and the elastic member (3) is located between the second end of the slide rod (21) and the second piston (23). The elastic member (3) is sleeved on the slide rod (21), and the two ends of the elastic member (3) are respectively against the second piston (23) and the inner wall of the base (1).

2. The hydraulic buffer device according to claim 1, characterized in that: The outer wall of the base (1) has a first oil port (101), a second oil port (102), a third oil port (103) and a fourth oil port (104), and the first oil port (101), the second oil port (102), the third oil port (103) and the fourth oil port (104) are located between the first cavity (11) and the second cavity (12), the first oil port (101) is in communication with the first cavity (11), and the second oil port (102) is in communication with the second cavity (12); The slide rod (21) has a first through hole (211) and a second through hole (212) arranged at intervals in the axial direction. When the piston assembly (2) is located at the first position, the first through hole (211) is respectively connected to the first oil port (101) and the third oil port (103) to form the first channel (201), and the second through hole (212) is respectively connected to the second oil port (102) and the fourth oil port (104) to form the second channel (202).

3. The hydraulic buffer device according to claim 2, characterized in that: The first channel (201) comprises a first vertical section (2011), a second vertical section (2012) and a first horizontal section (2013); The first vertical section (2011) and the second vertical section (2012) are respectively located on both sides of the axis direction of the slide rod (21); the first end of the first vertical section (2011) is the first oil port (101), and the second end of the first vertical section (2011) is selectively opposite to the first through hole (211); The first end of the second vertical section (2012) is the third oil port (103), and the second end of the second vertical section (2012) is selectively opposite to the first through hole (211); The first end of the first transverse section (2013) is in communication with the middle portion of the first vertical section (2011), and the second end of the first transverse section (2013) is in communication with the first cavity (11); The second channel (202) comprises a third vertical section (2021), a fourth vertical section (2022) and a second horizontal section (2023), wherein the third vertical section (2021) and the fourth vertical section (2022) are respectively located on both sides of the axis direction of the slide rod (21); The first end of the third vertical section (2021) is the second oil port (102), and the second end of the third vertical section (2021) is selectively opposite to the second through hole (212); the first end of the fourth vertical section (2022) is the fourth oil port (104), and the second end of the fourth vertical section (2022) is selectively opposite to the second through hole (212); The first end of the second transverse section (2023) is in communication with the middle portion of the third vertical section (2021), and the second end of the second transverse section (2023) is in communication with the second cavity (12).

4. The hydraulic buffer device according to claim 3, characterized in that: The first vertical section (2011) and the second vertical section (2012) are coaxially arranged, and the axial direction of the first vertical section (2011) is perpendicular to the axial direction of the sliding rod (21), and the inner diameters of the first vertical section (2011), the first through hole (211), and the second vertical section (2012) are the same; The third vertical section (2021) and the fourth vertical section (2022) are coaxially arranged, the axial direction of the third vertical section (2021) is perpendicular to the axial direction of the slide rod (21), and the inner diameters of the third vertical section (2021), the second through hole (212) and the fourth vertical section (2022) are the same.

5. The hydraulic buffer device according to claim 1, characterized in that: The first cavity (11) has a first inner wall (111) and a second inner wall (112) opposite to each other in the moving direction of the piston assembly (2), and the direction from the first inner wall (111) to the second inner wall (112) is the direction from the second piston (23) to the first piston (22); When the piston assembly (2) is located at the first position, the first piston (22) abuts against the first inner wall (111) of the first cavity (11).

6. The hydraulic buffer device according to claim 1, characterized in that: The outer wall of the base body (1) further comprises a fifth oil port (105), wherein the fifth oil port (105) is in communication with the first channel (201) and the first cavity (11); The hydraulic buffer device further comprises a first adjusting plug (4), which is movably connected to the fifth oil port (105), and the first adjusting plug (4) is used to adjust the flow area between the first cavity (11) and the first channel (201).

7. The hydraulic buffer device according to claim 6, characterized in that: The first cavity (11) has a first inner wall (111) and a second inner wall (112) opposite to each other in the moving direction of the piston assembly (2), and the direction from the first inner wall (111) to the second inner wall (112) is the direction from the second piston (23) to the first piston (22); When the piston assembly (2) is located at the second position, a gap exists between the first piston (22) and the second inner wall, and the fifth oil port (105) is located in the gap.

8. The hydraulic buffer device according to claim 1, characterized in that: The outer wall of the base (1) further has a sixth oil port (106), and the sixth oil port (106) is in communication with the second channel (202) and the second cavity (12); The hydraulic buffer device further comprises a second adjusting plug (5), which is movably connected to the sixth oil port (106), and the second adjusting plug (5) is used to adjust the flow area between the second cavity (12) and the second channel (202).

9. The hydraulic buffer device according to claim 1, characterized in that: The hydraulic buffer device further comprises an anti-rotation key (6), the anti-rotation key (6) being connected to the outer wall of the slide rod (21), and the anti-rotation key (6) being clearance-fitted with the base body (1).

10. A hydraulic control system, characterized in that: The hydraulic control system comprises a power element (100), an actuator (200), a hydraulic buffer device (300) and a control element (400), wherein the hydraulic buffer device (300) is the hydraulic buffer device according to any one of claims 1 to 9; The power element (100) and the hydraulic buffer device (300) are connected through the control element (400); the oil outlet of the power element (100) is connected to the oil inlet of the control element (400); the first working oil port of the control element (400) is connected to the first cavity (11) in the hydraulic buffer device (300); the first cavity (11) is connected to the oil inlet of the actuator (200); the oil outlet of the actuator (200) is connected to the second cavity (12) in the hydraulic buffer device (300); the second cavity (12) is connected to the second working oil port of the control element (400); and the oil return port of the control element (400) is connected to the oil return port of the power element (100).

Images