CN115095577A - Hydraulic buffer device and hydraulic control system - Google Patents

Abstract

The utility model provides a hydraulic buffer and hydraulic control system belongs to hydraulic transmission technical field. The hydraulic buffer device comprises a base body, a piston assembly and an elastic piece; the piston assembly comprises a slide bar, a first piston and a second piston, the first piston and the second piston are respectively connected with two ends of the slide bar, the first piston is movably positioned in the first cavity, the second piston is movably positioned in the second cavity, and the moving directions of the first piston and the second piston are the same as the axial direction of the slide bar; if the piston assembly is located at the first position, a first channel and a second channel are formed inside the sliding rod and the base body, and the first channel is communicated with the first cavity. The second channel is in communication with the second cavity. The elastic piece is located in the second cavity and located between the second end of the sliding rod and the second piston, and two ends of the elastic piece are respectively abutted to the second piston and the inner wall of the base body. The hydraulic buffer device can prolong the service life of the actuating element.

Description

Hydraulic buffer device and hydraulic control system

Technical Field

The disclosure belongs to the technical field of hydraulic transmission, and particularly relates to a hydraulic buffer device and a hydraulic control system.

Background

Hydraulic transmission is a transmission mode in which energy conversion and control are performed by using a pressure fluid as a working medium. The hydraulic transmission technology is adopted on the machine, so that the structure of the machine can be effectively simplified, the weight of the machine is reduced, the material consumption is reduced, and the working efficiency and the reliability are improved.

In the related art, a hydraulic transmission system generally includes a power element, an execution element, a control element, and the like, wherein an oil outlet of the power element is communicated with an oil inlet of the control element, a first working oil port of the control element is communicated with an oil inlet of the execution element, a second working oil port of the control element is communicated with an oil return port of the execution element, and the oil return port of the control element is communicated with an oil return port of the power element. After the hydraulic transmission system is started, the power element inputs high-pressure oil to the execution element through the control element, so that the execution element can act. When the hydraulic transmission system is closed, the power element suspends inputting high-pressure oil to the execution element, and the execution element stops acting. When the hydraulic drive system is activated, the actuator pressure builds momentarily, which can cause an impact to the actuator. And when hydraulic system closed, the executive component has great inertia, closes the hydraulic circuit in the twinkling of an eye, can cause the impact to hydraulic transmission system, seriously influences hydraulic transmission system's life. In order to reduce the impact force when the actuating element is opened and closed, a separate slow opening valve and a separate slow closing valve are generally arranged in the hydraulic transmission system, and the slow opening valve and the slow closing valve are connected between the actuating element and the control element.

However, since the slow start valve and the slow close valve are separately connected between the actuator and the control element, the hydraulic transmission system is complicated and the volume of the hydraulic transmission system is increased.

Disclosure of Invention

The embodiment of the disclosure provides a hydraulic buffer device and a hydraulic control system, which can simplify the structure of a transmission system. The technical scheme is as follows:

the disclosed embodiment provides a hydraulic buffer device, which comprises a base body, a piston assembly and an elastic piece; the substrate is internally provided with a first cavity and a second cavity which are isolated from each other; the piston assembly comprises a slide bar, a first piston and a second piston, the first piston is connected with the first end of the slide bar, the second piston is positioned between the first end and the second end of the slide bar, the second piston is connected with the outer wall of the slide bar, the first piston is positioned in the first cavity, and the second piston is positioned in the second cavity; the piston assembly is configured to move along the axial direction of the slide rod between a first position and a second position, when the piston assembly is located at the first position, a first channel and a second channel are formed inside the slide rod and the base body, the first channel is communicated with the first cavity, the second channel is communicated with the second cavity, a first end of the first channel and a first end of the second channel are respectively used for being communicated with an oil port of a power element, and a second end of the first channel and a second end of the second channel are respectively used for being communicated with an oil port of an actuating element; when the piston assembly is located at the second position, the slide rod and the inner part of the base body do not form a first channel and a second channel; the elastic piece is located in the second cavity, the elastic piece is located between the second end of the sliding rod and the second piston, the sliding rod is sleeved with the elastic piece, and two ends of the elastic piece respectively abut against the second piston and the inner wall of the base body.

In another implementation manner of the present disclosure, the outer wall of the base body 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 communicated with the first cavity, and the second oil port is communicated with the second cavity; the sliding rod is provided with a first through hole and a second through hole which are arranged at intervals in the axial direction, when the piston assembly is located at the first position, the first through hole is communicated with the first oil port and the third oil port respectively to form the first channel, and the second through hole is communicated with the second oil port and the fourth oil port respectively to form the second channel.

In yet another implementation of the present disclosure, the first channel includes a first vertical section, a second vertical section, and a first horizontal section; the first vertical section and the second vertical section are respectively positioned at two sides of the axis direction of the slide bar, a first end of the first vertical section is provided with a first oil port, and a second end of the first vertical section is selectively opposite to the first through hole; the first end of the second vertical section is a third oil port, and the second end of the second vertical section is selectively opposite to the first through hole; the first end of the first transverse section is communicated with the middle part of the first vertical section, and the second end of the first transverse section is communicated with the first cavity; the second channel comprises a third vertical section, a fourth vertical section and a second transverse section, and the third vertical section and the fourth vertical section are respectively positioned at two sides of the axis direction of the slide bar; the first end of the third vertical section is a second oil port, the second end of the third vertical section is selectively opposite to the second through hole, the first end of the fourth vertical section is a fourth oil port, and the second end of the fourth vertical section is selectively opposite to the second through hole; the first end of the second transverse section is communicated with the middle of the third vertical section, and the second end of the second transverse section is communicated with the second cavity.

In another implementation manner of the present disclosure, the first vertical section and the second vertical section are coaxially arranged, an axial direction of the first vertical section is perpendicular to an axial direction of the slide bar, and inner diameters of the first vertical section, the first through hole and the second vertical section are the same; the third vertical section and the fourth vertical section are coaxially arranged, the axis direction of the third vertical section is perpendicular to the axis direction of the sliding rod, and the inner diameters of the third vertical section, the second through hole and the fourth vertical section are the same.

In yet another implementation of the present disclosure, the first cavity has first and second opposing inner walls in a direction of movement of the piston assembly, the first inner wall to the second inner wall being in a direction of the second piston to the first piston; if the piston assembly is located at the first position, the first piston abuts against the first inner wall.

In another implementation manner of the present disclosure, the outer wall of the base further has a fifth oil port, and the fifth oil port is communicated with the first channel and the first cavity; the hydraulic buffer device further comprises a first adjusting plug, the first adjusting plug is movably connected into the fifth oil port, and the first adjusting plug is used for adjusting the flow area of the first cavity and the first channel.

In yet another implementation of the present disclosure, the first cavity has a first inner wall and a second inner wall opposite to each other in a moving direction of the piston assembly, and a direction from the first inner wall to the second inner wall is a direction from the second piston to the first piston; if the piston assembly is located at the second position, a gap is formed between the first piston and the second inner wall, and the fifth oil port is located in the gap.

In yet another implementation of the present disclosure, the outer wall of the base further has a sixth oil port, and the sixth oil port is communicated with the second channel and the second cavity; the hydraulic buffer device further comprises a second adjusting plug, the second adjusting plug is movably connected into the sixth oil port, and the second adjusting plug is used for adjusting the flow area of the second cavity and the second channel.

In yet another implementation of the present disclosure, the hydraulic buffer device includes an anti-rotation key connected to an outer wall of the sliding rod, and the anti-rotation key is in clearance fit with the base when the piston assembly is located at the first position.

In yet another implementation manner of the present disclosure, a hydraulic control system is further provided, where the hydraulic control system includes a power element, an actuator, a hydraulic buffer device and a control element, and the hydraulic buffer device is the above-mentioned hydraulic buffer device; the oil outlet of the power element is communicated with the oil inlet of the control element, a first working oil port of the control element is communicated with a first cavity in the hydraulic buffer device, the first cavity is communicated with the oil inlet of the execution element, the oil outlet of the execution element is communicated with a second cavity in the hydraulic buffer device, the second cavity is communicated with a second working oil port of the control element, and an oil return port of the control element is communicated with an oil return port of the power element.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

when the hydraulic buffer device provided by the embodiment of the disclosure is used in a hydraulic control system, the hydraulic buffer device comprises a base body, a piston assembly and an elastic member, and the base body is internally provided with a first cavity and a second cavity which are isolated from each other, so that the first cavity and an oil inlet of an execution element can be communicated with an oil return port of the execution element, that is, the first cavity is used as an oil inlet cavity of the execution element, and the second cavity is used as an oil return cavity of the execution element, so that the base body can be connected in the hydraulic control system.

When the executive component starts, the first cavity is used as an oil inlet chamber, the first cavity is communicated with the power component, pressure oil exists in the first cavity, and therefore the pressure oil can push the first piston to move towards the second piston. Because the elastic component is sleeved on the sliding rod, and two ends of the elastic component respectively abut against the second piston and the inner wall of the base body, the first piston and the second piston can slowly move. Because the piston assembly has the first position and the second position, when the piston assembly moves slowly to the first position, because the slide rod and the inner part of the base body form the first channel and the second channel, the pressure oil output by the power element enters the actuating element through the first channel, and the actuating element is driven to perform corresponding actions. At the same time, the return oil of the actuating element is recovered to the power element through the second passage.

When the actuator is closed, the power element does not continue to supply pressurized oil to the first oil passage. At the moment, the elastic piece pushes the sliding rod to slowly move from the first position to the second position. During the moving process of the sliding rod, the first channel and the second channel are slowly cut off and generate a damping effect, so that the sliding rod slowly moves until the first channel and the second channel are cut off. Meanwhile, the first piston extrudes the pressure oil in the first cavity, so that the pressure oil in the first cavity is discharged through the corresponding oil drainage port. In this way, the actuator can be slowly closed until the actuator is locked.

That is to say, in the embodiment of the disclosure, because the piston assembly moves slowly in the base body, and the first passage and the second passage are also communicated slowly or cut off slowly in a staggered manner, the pressure oil entering the actuating element also flows slowly or is recovered slowly, so that the impact force of the actuating element when the actuating element is opened and closed can be greatly reduced, and the service life of the actuating element is further prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic damping device provided in an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

fig. 4 is a schematic structural diagram of a hydraulic control system provided in an embodiment of the present disclosure.

The symbols in the drawings represent the following meanings:

1. a substrate; 11. a first cavity; 111. a first inner wall; 112. a second inner wall; 12. a second cavity;

2. a piston assembly; 21. a slide bar; 22. a first piston; 23. a second piston;

3. an elastic member;

4. a first adjusting plug;

5. a second adjusting plug; 6. a rotation prevention key;

101. a first oil port; 102. a second oil port; 103. a third oil port; 104. a fourth oil port; 105. a fifth oil port; 106. a sixth oil port;

201. a first channel; 2011. a first vertical section; 2012. a second vertical section; 2013. a first transverse segment;

202. a second channel; 2021. a third vertical section; 2022. a fourth vertical section; 2023. a second transverse segment;

211. a first through hole; 212. a second through hole;

100. a power element; 200. an actuator; 300. a hydraulic buffer device; 400. a control element.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The disclosed embodiment provides a hydraulic buffer device, as shown in fig. 1, the hydraulic buffer device includes a base 1, a piston assembly 2, and an elastic member 3. The inside of the base body 1 has a first cavity 11 and a second cavity 12 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 with 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, the second piston 23 is connected with 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.

The piston assembly 2 is configured to move along an axial direction of the slide rod 21 between a first position and a second position, when the piston assembly 2 is located at the first position, the slide rod 21 and the inside 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, the second channel 202 is communicated with the second cavity 12, a first end of the first channel 201 and a first end of the second channel 202 are respectively used for being communicated with an oil port of the power element, and a second end of the first channel 201 and a second end of the second channel 202 are respectively used for being communicated with an oil port of the actuator. When the piston assembly 2 is in the second position, the slide rod 21 and the interior of the base body 1 do not form the first channel 201 and the second channel 202.

The elastic part 3 is located in the second cavity 12, the elastic part 3 is located between the second end of the sliding rod 21 and the second piston 23, the elastic part 3 is sleeved on the sliding rod 21, and two ends of the elastic part 3 respectively abut against the second piston 23 and the inner wall of the base body 1.

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

When the actuator is started, the first cavity 11 serves as an oil inlet chamber, the first cavity 11 is communicated with the power element, and pressure oil (as shown by the arrow on the right side in fig. 1) is contained in the first cavity 11, so that the pressure oil pushes the first piston 22 to move towards the second piston 23. Since the elastic member 3 is sleeved on the sliding rod 21, the two ends of the elastic member 3 respectively abut against the second piston 23 and the inner wall of the base body 1, so that the first piston 22 and the second piston 23 can move slowly. Since the piston assembly 2 has the first position and the second position, when the piston assembly 2 moves slowly to the first position, since the slide rod 21 and the inner portion of the base body 1 form the first channel 201 and the second channel 202, the pressure oil output by the power element enters the actuator through the first channel 201 (see the arrow in the first channel in fig. 1), and the actuator is driven to perform a corresponding action. At the same time, the return oil from the actuator is recovered to the power element through the second passage 202 (see the arrow in the second passage in fig. 1).

When the actuator is closed, the power element does not continue to supply pressurized oil to the first oil passage. At this time, the elastic member pushes the slide bar 21 to move slowly from the first position to the second position. During the movement of the slide bar 21, the first channel 201 and the second channel 202 are slowly cut off and generate a damping effect, so that the slide bar 21 slowly moves until the first channel 201 and the second channel 202 are cut off. At the same time, the first piston 22 presses the pressure oil in the first chamber 11, so that the pressure oil in the first chamber 11 can also be slowly fed into the actuator through the first passage 201, which is gradually cut off, while being discharged through the second passage 202. In this way, the actuator can be slowly closed until the actuator is locked.

That is to say, in the embodiment of the present disclosure, because the piston assembly 2 moves slowly in the base 1, and the first channel 201 and the second channel 202 are also communicated slowly or cut off in a staggered manner, the pressure oil entering the actuator also flows slowly or is recovered slowly, so that the impact force of the actuator during opening and closing can be greatly reduced, and the service life of the actuator can be further prolonged.

Of course, in the embodiment of the present disclosure, the second cavity 12 may also be used as an oil inlet chamber when the actuator is started, and at this time, the second cavity 12 is communicated with the power element (i.e., the cavity between the second piston 23 and the inner wall of the second cavity 12 close to the first piston 22 in fig. 1 is communicated with the power element), so that the pressure oil pushes the second piston 23 to move away from the first piston 22 (i.e., to move in the left direction in fig. 1), so that the piston assembly 2 slowly moves from the second position to the first position. The process is similar to the above process in which the first cavity 11 is used as an oil inlet chamber, and is not described herein again.

Therefore, the hydraulic buffer device provided by the embodiment of the disclosure can control the bidirectional slow opening and closing of the executing element, so that the pressure oil path and the oil return oil path can be freely exchanged under different working states, the hydraulic system is greatly simplified, the hydraulic control system is simplified, and the volume of the corresponding hydraulic system is optimized.

In this embodiment, the elastic member 3 is a retractable spring. The piston assembly 2 can be automatically switched from the first position into the second position by means of the telescopic spring.

With reference to fig. 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, 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 communicated with the first cavity 11, and the second oil port 102 is communicated with the second cavity 12.

Fig. 2 is a sectional view taken along a direction a-a in fig. 1, and in conjunction with fig. 2, 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 communicated with the first oil port 101 and the third oil port 103 to form a first passage 201, and the second through hole 212 is respectively communicated with the second oil port 102 and the fourth oil port 104 to form a second passage 202.

In the above implementation manner, the outer wall of the base body 1 is provided with the first oil port 101, the second oil port 102, the third oil port 103 and the fourth oil port 104, so that the first oil port 101 can be used as an oil inlet to communicate with a power element in the hydraulic control system. And the second oil port 102 is used as an oil return port, so that the hydraulic control system is communicated with a power element in the hydraulic control system. The third oil port 103 is used as a first working oil port and is communicated with an oil inlet of an actuating element in the hydraulic control system. And the fourth oil port 104 is used as a second working oil port and is communicated with an oil return port of the actuating element.

Meanwhile, the first through hole 211 and the second through hole 212 are arranged on the slide rod 21 at intervals, so that when the piston assembly 2 is located at the first position, the first through hole 211 is aligned and communicated with the first oil port 101 and the third oil port 103 to form a first passage 201, and meanwhile, the second through hole 212 is aligned and communicated with the second oil port 102 and the fourth oil port 104 to form a second passage 202, that is, the first passage 201 is used as an oil inlet passage of the actuating element, and the second passage 202 is used as an oil return passage.

Referring again to fig. 1, the first channel 201 includes a first riser 2011, a second riser 2012, and a first cross-member 2013. The first vertical section 2011 and the second vertical section 2012 are respectively located at two sides of the axial direction of the sliding rod 21, a first end of the first vertical section 2011 is a first oil port 101, and a second end of the first vertical section 2011 is selectively opposite to the first through hole 211.

The first end of the second riser 2012 is the third port 103, and the second end of the second riser 2012 is selectively opposite to the first through hole 211. The first end of the first horizontal segment 2013 is communicated with the middle of the first vertical segment 2011, and the second end of the first horizontal segment 2013 is communicated with the first cavity 11.

The second channel 202 includes a third vertical section 2021, a fourth vertical section 2022 and a second transverse section 2023, and the third vertical section 2021 and the fourth vertical section 2022 are respectively located at two sides of the axial direction of the slide bar 21.

The first end of the third vertical section 2021 is a second oil port 102, 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 a 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 communicated with the middle of the third vertical section 2021, and the second end of the second transverse section 2023 is selectively opposite to the second cavity 12.

In the above implementation, the first passage 201 is set to be the first vertical section 2011, the second vertical section 2012 and the first horizontal section 2013, so that the first oil port 101 can be formed through the first vertical section 2011, and meanwhile, the first passage is also used for communicating with the first through hole 211. The third oil port 103 is formed through the second riser 2012 while also communicating with the first through hole 211. And the first transverse section 2013 is adapted to communicate with the first vertical section 2011 so as to communicate the first passage 201 with the first cavity 11.

Similarly, providing the second passage 202 as the third vertical section 2021, the fourth vertical section 2022 and the second horizontal section 2023 enables the second oil port 102 to be formed through the third vertical section 2021, and also serves to communicate with the second through hole 212. The fourth oil port 104 is formed through the fourth vertical section 2022 while also communicating with the second through hole 212. While the second transverse section 2023 is adapted to communicate with the third vertical section 2021 such that the second channel 202 communicates with the second cavity 12.

Illustratively, when the piston assembly 2 is in the first position, the second end of the first upright section 2011 is opposite to and in communication with the first through bore 211, and the second end of the second upright section 2012 is opposite to and in communication with the first through bore 211. The second end of the third vertical section 2021 is opposite to and communicates with the second through hole 212, and the second end of the fourth vertical section 2022 is opposite to and communicates with the second through hole 212. This makes it possible to form the first passage 201 and the second passage 202.

Referring again to fig. 1, optionally, 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 slide bar 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 bar 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.

In the above implementation, by the above arrangement, on the one hand, the first channel 201 and the second channel 202 can be formed quickly 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 communicated with the first through hole 211, and the second oil port 102 and the fourth oil port 104 are communicated with the second through hole 212, the linear change can be generated along with the moving speed of the slide rod 21, that is, the flow areas of the first passage 201 and the second passage 202 are slowly controlled, so as to effectively control the opening speed of the actuator.

Optionally, the first chamber 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.

In the above implementation, when the piston assembly 2 is located at the first position, the first piston 22 and the first inner wall 111 are set in an abutting state, so that when the piston assembly 2 moves under the action of the pressure oil, the piston assembly cannot move forward until the first position, that is, during the process of moving from the second position to the first position, the corresponding end position is the first position. The first piston 22 is limited by the inside of the first cavity 11, so that the actuator can be in an open state or a closed state in the state, and the actuator is locked.

With continued reference to fig. 1, the outer wall of the base 1 further has a fifth oil port 105, and the fifth oil port 105 is communicated with the first passage 201 and the first cavity 11.

The hydraulic buffer device further comprises a first adjusting plug 4, the first adjusting plug 4 is movably connected in the fifth oil port 105, and the first adjusting plug 4 is used for adjusting the flow area between the first cavity 11 and the first channel 201.

In the above implementation, the fifth oil port 105 is formed in the outer wall of the base, so that the first adjusting plug 4 is conveniently installed. 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, that is, the flow rate of the pressure oil between the first cavity 11 and the first channel 201 can be slowly adjusted, and the pressure oil entering the actuator is further controlled, so that the actuator is slowly opened or closed, and the impact force or inertia is reduced.

That is, the fifth oil port 105 and the first adjusting 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 actuating element through the first control oil port.

Alternatively, if the piston assembly 2 is located at the second position, a gap (L in fig. 1) is formed between the first piston 22 and the second inner wall 112, and the fifth oil port 105 is located in the gap.

This allows a large amount of pressure oil to be filled through the gap, so that the first piston 22 can be moved towards the second piston 23 by the pressure oil, and the piston assembly 2 can be transferred from the second position into the first position.

In fig. 1, for the sake of simplicity, the distance a in fig. 1 is the same as the distance b in the case where the piston assembly 2 moves from the first position to the second position, i.e. the first piston 22 and the second piston 23 are shown in dashed lines as corresponding positions when the piston assembly 2 is in the second position.

With continued reference to fig. 1, 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 passage 202 and the second cavity 12.

The hydraulic buffer device further includes a second adjusting plug 5, the second adjusting plug 5 is movably connected to the sixth oil port 106, and the second adjusting plug 5 is configured to adjust a flow area between the second cavity 12 and the second passage 202.

In the above implementation manner, the sixth oil port 106 is disposed on the outer wall of the base, so that the second adjusting plug 5 is conveniently installed. By arranging the second adjusting plug 5, the flow area between the second cavity 12 and the second channel 202 can be slowly controlled by adjusting the second adjusting plug 5, that is, the flow rate of the pressure oil between the second cavity 12 and the second channel 202 can be slowly adjusted, and the pressure oil entering the actuator is further controlled, so that the actuator is slowly opened or closed, and the impact force or inertia is reduced.

That is, the sixth oil port 106 and the second adjusting plug 5 can jointly form a second control oil port, so that the flow of the pressure oil between the base body 1 and the actuator is controlled through the second control oil port.

Illustratively, the first adjusting plug 4 and the second adjusting plug 5 are identical in structure and are both adjusting bolts. Correspondingly, the fifth oil port 105 and the sixth oil port 106 are threaded holes, the first adjusting plug 4 is inserted into the fifth oil port 105 through a thread, and the second adjusting plug 5 is inserted into the sixth oil port 106 through a thread.

This facilitates adjustment of 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.

Illustratively, the fifth port 105 is located at the communication of the first cross-section 2013 with the first cavity 11. The sixth oil port 106 is located at the communication between the second cross section 2023 and the second cavity 12.

This can effectively control 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.

Optionally, the hydraulic damping means comprises an anti-rotation key 6, the anti-rotation key 6 being connected to an outer wall of the slide rod 21, the anti-rotation key 6 being in contact with the base body 1 when the piston assembly 2 is in position.

In the above implementation manner, the main function of the anti-rotation key 6 is to prevent the relative rotation between the base body 1 and the slide rod 21, and to prevent the oil port on the base body 1 and the oil port of the slide rod 21 from being not in the same straight line.

Illustratively, the anti-rotation key 6 is a flat key.

In the above implementation, the anti-rotation key 6 is configured as a flat key, which facilitates the installation and prevents the relative rotation between the base 1 and the sliding rod 21.

Illustratively, a key slot is arranged on the outer wall of the slide rod 21, an anti-rotation key is in interference fit in the key slot, and the anti-rotation key 6 is in clearance fit with the base body 1. Thus, the rotation prevention key can be installed through the key groove, so that the rotation prevention key can move together with the slide bar 21 without being separated.

Illustratively, the piston assembly 2 further comprises a plurality of sealing elements which are sleeved on the sliding rod 21 at intervals and are respectively contacted with the base body 1.

In the above implementation, the sealing element is used for sealing the sealing performance between the sliding rod 21 and the base body 1, so that the overall sealing performance of the hydraulic buffer device is improved.

Wherein, the sealing member is an annular sealing ring.

Fig. 3 is a cross-sectional view taken along the direction B-B in fig. 1, and in conjunction with fig. 3, the base 1 has a circular cylindrical structure, and two ends of the base 1 respectively form a first sealed cavity 11 and a second sealed cavity 12.

In the above implementation manner, the base body 1 is set to be a circular cylindrical structure, so that the formed first cavity 11 and second cavity 12 are cylindrical, and thus the first piston 22 and the second piston 23 are respectively set to be corresponding circular structures, which facilitates the first piston 22 and the second piston 23 to be movably arranged in the base body 1 without considering the matching problem between the first piston 22 and the inner wall of the base body 1 and the second piston 23, simplifies the structure, and improves the assembly efficiency.

On the other hand, an embodiment of the present disclosure further provides a hydraulic control system, as shown in fig. 4, the hydraulic control system includes a power element 100, an actuating element 200, a hydraulic buffer device 300, and a control element 400, where the hydraulic buffer device 300 is the aforementioned hydraulic buffer device.

An oil outlet of the power element 100 is communicated with an oil inlet of the control element 400, a first working oil port of the control element 400 is communicated with a first cavity 11 in the hydraulic buffer device 300, the first cavity 11 is communicated with an oil inlet of the execution element 200, an oil outlet of the execution element 200 is communicated with a second cavity 12 in the hydraulic buffer device 300, the second cavity 12 is communicated with a second working oil port of the control element 400, and an oil return port of the control element 400 is communicated with an oil return port of the power element 100.

The above hydraulic control system has the same advantages as the hydraulic buffer device, which is described herein.

Illustratively, the power element 100 is an oil supply system including an oil tank and an oil pump. The output oil port of the oil pump is communicated with the first oil port of the hydraulic buffer device, and the oil tank is communicated with the second oil port of the hydraulic buffer device. The actuator 200 is a motor or a cylinder.

The above description is intended only to illustrate the preferred embodiments of the present disclosure, and should not be taken as limiting the disclosure, as any modifications, equivalents, improvements and the like which are within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (10)

1. A hydraulic damping device, characterized in that it comprises a base body (1), a piston assembly (2) and an elastic member (3);

the substrate (1) is internally provided with 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), the first piston (22) is connected with the first end of the slide rod (21), the second piston (23) is positioned between the first end and the second end of the slide rod (21), the second piston (23) is connected with the outer wall of the slide rod (21), the first piston (22) is positioned in the first cavity (11), and the second piston (23) is positioned in the second cavity (12);

the piston assembly (2) is configured to move along the axial direction of the slide rod (21) between a first position and a second position, when the piston assembly (2) is located at the first position, the slide rod (21) and the base body (1) form a first channel (201) and a second channel (202), the first channel (201) is communicated with the first cavity (11), the second channel (202) is communicated with the second cavity (12), a first end of the first channel (201) and a first end of the second channel (202) are respectively used for being communicated with an oil port of a power element, and a second end of the first channel (201) and a second end of the second channel (202) are respectively used for being communicated with an oil port of an actuating element;

when the piston assembly (2) is in the second position, the slide rod (21) and the interior of the base body (1) do not form a first channel (201) and a second channel (202);

the elastic piece (3) is located in the second cavity (12), the elastic piece (3) is located between the second end of the sliding rod (21) and the second piston (23), the elastic piece (3) is sleeved on the sliding rod (21), and two ends of the elastic piece (3) are respectively abutted to the second piston (23) and the inner wall of the base body (1).

2. The hydraulic buffer device as claimed in claim 1, wherein the outer wall of the base body (1) is provided with a first oil port (101), a second oil port (102), a third oil port (103) and a fourth oil port (104), 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 communicated with the first cavity (11), and the second oil port (102) is communicated with the second cavity (12);

the slide rod (21) is provided with a first through hole (211) and a second through hole (212) which are arranged at intervals in the axial direction, when the piston assembly (2) is located at the first position, the first through hole (211) is communicated with the first oil port (101) and the third oil port (103) respectively to form the first channel (201), and the second through hole (212) is communicated with the second oil port (102) and the fourth oil port (104) respectively to form the second channel (202).

3. A hydraulic damping device according to claim 2, characterised 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 two sides of the axis direction of the sliding rod (21), a first oil port (101) is arranged at a first end of the first vertical section (2011), and a 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 a 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 communicated with the middle of the first vertical section (2011), and the second end of the first transverse section (2013) is communicated with the first cavity (11);

the second channel (202) comprises a third vertical section (2021), a fourth vertical section (2022) and a second transverse section (2023), and the third vertical section (2021) and the fourth vertical section (2022) are respectively positioned at two sides of the axial direction of the slide bar (21);

the first end of the third vertical section (2021) is a second oil port (102), 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 communicated with the middle part of the third vertical section (2021), and the second end of the second transverse section (2023) is communicated with the second cavity (12).

4. The hydraulic damping device according to claim 3, characterised in that the first vertical section (2011) and the second vertical section (2012) are coaxially arranged, and the direction of the axis of the first vertical section (2011) is perpendicular to the direction of the axis of the slide rod (21), and the internal 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 bar (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. A hydraulic damping device according to claim 1, characterised in that the first chamber (11) has opposite first (111) and second (112) inner walls in the direction of movement of the piston assembly (2), the direction of the first (111) to second (112) inner walls being the direction of the second piston (23) to the first piston (22);

if the piston assembly (2) is located at the first position, the first piston (22) abuts against a first inner wall (111) of the first cavity (11).

6. The hydraulic damping device according to claim 1, characterized in that the outer wall of the base body (1) further has a fifth oil port (105), the fifth oil port (105) being in communication with the first passage (201) and the first cavity (11);

the hydraulic buffer device further comprises a first adjusting plug (4), the first adjusting plug (4) is movably connected into the fifth oil port (105), and the first adjusting plug (4) is used for adjusting the flow area of the first cavity (11) and the first channel (201).

7. A hydraulic damping arrangement according to claim 6, characterised in that the first chamber (11) has opposite first (111) and second (112) inner walls in the direction of movement of the piston assembly (2), the direction of the first (111) to second (112) inner walls being the direction of the second (23) to first (22) piston;

if the piston assembly (2) is located at the second position, a gap is formed between the first piston (22) and the second inner wall, and the fifth oil port (105) is located in the gap.

8. The hydraulic damping device according to claim 1, characterized in that the outer wall of the base body (1) further has a sixth oil port (106), the sixth oil port (106) being in communication with the second passage (202) and the second cavity (12);

the hydraulic buffer device further comprises a second adjusting plug (5), the second adjusting plug (5) is movably connected into the sixth oil port (106), and the second adjusting plug (5) is used for adjusting the flow area of the second cavity (12) and the second channel (202).

9. A hydraulic damping device according to claim 1, characterised in that it comprises an anti-rotation key (6), said anti-rotation key (6) being connected to an outer wall of said slide rod (21), said anti-rotation key (6) being in clearance fit with said base body (1) when said piston assembly (2) is in said first position.

10. A hydraulic control system, characterized in that the hydraulic control system comprises a power element (100), an actuator (200), a hydraulic damping device (300) and a control element (400), the hydraulic damping device (300) being the hydraulic damping device according to any one of claims 1 to 9;

the oil outlet of the power element (100) is communicated with the oil inlet of the control element (400), a first working oil port of the control element (400) is communicated with a first cavity (11) in the hydraulic buffer device (300), the first cavity (11) is communicated with the oil inlet of the execution element (200), the oil outlet of the execution element (200) is communicated with a second cavity (12) in the hydraulic buffer device (300), the second cavity (12) is communicated with a second working oil port of the control element (400), and the oil return port of the control element (400) is communicated with the oil return port of the power element (100).

Images