CN220850213U - Microminiature hydraulic cylinder buffer - Google Patents

Abstract

The utility model discloses a microminiature hydraulic cylinder buffer device, and belongs to the field of hydraulic cylinder buffer. The device comprises a cylinder body, a piston rod and a buffer plunger, wherein the tail end of the cylinder body is provided with a buffer plunger hole; the side wall of the buffer plunger hole is provided with a one-way valve hole; a flat end opposite-top wave spring is arranged in the one-way valve hole; the end, far away from the buffering plunger hole, of the flat end opposite-top wave spring is coaxially connected with a sealing plug; the other end of the flat end opposite-pushing wave spring is connected with a valve core; the top of the valve core is in a conical structure, and the bottom of the valve core is provided with a first limit groove matched with the flat-end opposite-top wave spring; the valve core is provided with a plurality of through holes along the horizontal direction; a first cavity is arranged between the valve core and the sealing plug, and the first cavity is communicated with the through hole through a connecting hole arranged along the axial direction; and the side wall of the one-way valve hole is provided with an oil passing side hole for connecting the through hole and the large cavity of the cylinder body. The buffer device has no obvious noise, and can realize good neutrality and good oil sealing effect of the valve core of the hydraulic cylinder under any installation angle state.

Description

Microminiature hydraulic cylinder buffer

Technical Field

The utility model relates to the technical field of hydraulic cylinder buffering, in particular to a miniature hydraulic cylinder buffering device.

Background

The excavator is required to have high overall operation efficiency by the industry, especially a microminiature excavator, the structure of the type of excavator is small and the layout is compact, the working device and the balance weight center of the overall machine base are greatly changed under different states, the reciprocating speed of a hydraulic cylinder is high, the impact strength is high, and the reversing frequency is high. Therefore, in the reciprocating motion process of the hydraulic cylinder, when the piston rod is retracted to the end, the running speed of the piston rod is high, and the piston rod is easy to mechanically collide with the cylinder bottom, so that the use reliability of the hydraulic cylinder is affected. In order to prolong the service life of the hydraulic cylinder sealing system and avoid mechanical impact and hydraulic impact by other structural members of the main machine, a certain buffer structure is usually arranged at the end of the internal stroke of the hydraulic cylinder to reduce the mechanical impact.

The check valve in the adjustable flow hole type buffer device in the prior art usually adopts a common spring to support a steel ball to block an oil port channel, and in the process that the buffer plunger enters a buffer column hole, the steel ball is subjected to spring force and reverse impact of oil liquid in the buffer column hole, noise is caused by rotation in a valve hole, and the larger the system flow is, the more obvious the rotation sound is. In the same way, in the quick starting process of the piston rod (the buffer plunger is far away from the buffer column hole), the oil pushes the steel ball to move, and the steel ball is also rotated due to the impact force of the oil and the elastic force of the reverse spring, so that noise is generated. When the oil cylinder is placed at a certain installation angle, such as the level of the one-way valve or a certain inclination angle, in the process that the piston rod rapidly reciprocates and repeatedly enters the buffer area, the steel ball is at risk of shifting to one side of the valve hole, for example, the spring is blocked on the screw thread after being askew under the pressure of oil, so that rebound cannot be performed, at the moment, the steel ball cannot block an oil port communicated with an inner hole of the buffer column, so that oil is leaked from two cavities, and finally, the problem of intermittent non-buffer can occur, so that the service life of the hydraulic cylinder is influenced.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the miniature hydraulic cylinder buffer device, which has no obvious noise, can realize good valve core to neutrality and good oil sealing effect of the hydraulic cylinder in any installation angle state, and can avoid the problem that the intermittent buffer does not exist due to overlarge flow of a host system.

The utility model is realized by the following technical scheme:

the miniature hydraulic cylinder buffer device comprises a cylinder body, a piston rod and a buffer plunger, and is characterized in that the tail end of the cylinder body is provided with a buffer plunger hole; the side wall of the buffer plunger hole is provided with a one-way valve hole; a flat end opposite-top wave spring is arranged in the one-way valve hole; a sealing plug is arranged at one end of the flat end opposite-pushing wave spring, which is far away from the buffer plunger hole, and the flat end opposite-pushing wave spring is coaxial with the sealing plug; the other end of the flat end opposite-pushing wave spring is connected with a valve core; the top of the valve core is in a conical structure, and the bottom of the valve core is provided with a first limit groove matched with the flat end opposite-top wave spring; the valve core is provided with a plurality of through holes along the horizontal direction; a first cavity is arranged between the valve core and the sealing plug, and the first cavity is communicated with the through hole through a connecting hole arranged along the axial direction; and the side wall of the one-way valve hole is provided with an oil passing side hole for connecting the through hole and the large cavity of the cylinder body.

The working principle of the buffer device is as follows: in the reciprocating motion process of the piston rod, when the piston rod approaches (namely, the buffer plunger enters the buffer plunger hole), oil in the large cavity of the cylinder body flows into the one-way valve hole from the oil passing side hole and flows into the first cavity through the through hole, the valve core is subjected to the action of the flat end on the top wave spring and the elastic force and the pressure of the oil in the first cavity, the oil passing port communicated with the one-way valve hole and the buffer plunger hole can be sealed, and the large-cavity oil can only flow into the buffer plunger hole to form buffer. When the hydraulic cylinder is started quickly (namely the buffer plunger leaves the buffer plunger hole), oil enters the buffer plunger hole from the oil port, oil flows out from a throttling gap formed by the buffer plunger and the buffer plunger hole, when the pressure of the oil in the gap is larger than the elasticity of the flat-end opposite-top wave spring, the spring is compressed, the oil pushes the valve core to move, the one-way valve hole is communicated with the buffer plunger hole through the oil port, the oil in the buffer plunger hole flows into a large cavity of the cylinder body from the oil passing side hole, and the piston rod is pushed to move, so that the quick starting is realized.

The beneficial effects are that: according to the utility model, the valve core is adopted to replace a common steel ball, no obvious noise is generated when the valve core moves up and down, the top of the valve core is in a conical structure, an oil passing port connected with a buffer plunger hole can be plugged, and the oil sealing effect is good; compared with a common spring, the flat end opposite-top wave spring has stronger bearing capacity, at least half of space can be saved when the same load is born, the centering is better when the spring is rebounded, the upper end of the flat end opposite-top wave spring is connected with the valve core through a first limit groove arranged along the axial direction, and the two limit grooves are matched with each other, so that the valve core can be automatically centered under any installation angle, and the problem that the valve core has clearance and no buffering due to overlarge flow of a host system is avoided; in the whole device, the sealing plug is used for sealing the one-way valve hole and supporting the flat-end opposite-top wave spring; the through hole and the connecting hole are used for guiding oil into a first cavity formed by the valve core and the sealing plug, when the buffer plunger enters the buffer plunger hole, the oil in the first cavity can generate upward pressure on the valve core, and the oil can be matched with the flat-end opposite-pushing wave spring to firmly push against the oil passing hole, so that the oil in the one-way valve hole is prevented from entering the buffer plunger hole; the oil passing side hole is used for enabling oil in the large cavity to enter the one-way valve hole and oil in the buffer plunger hole to enter the large cavity.

Preferably, the top of the sealing plug is provided with a second limit groove matched with the flat end opposite-top wave spring; the beneficial effects are that: and a second limit groove is arranged below the flat end opposite-top wave spring and is matched with the first limit groove, so that the centering of the flat end opposite-top wave spring is further enhanced, and the valve core always keeps good centering under different system flows.

Preferably, a first shoulder is arranged on the valve core, a second chamber is formed between the first shoulder and the one-way valve hole, and the second chamber is communicated with the oil passing side hole; the beneficial effects are that: the first shoulder is arranged on the valve core, so that a second chamber is formed before the valve core and the one-way valve hole, and when the spring is compressed, oil passing through the oil port above conveniently flows into the oil passing side hole on the side edge.

Preferably, a second shoulder is arranged on the one-way valve hole, and the second shoulder is positioned below the valve core; the beneficial effects are that: the second shoulder is arranged below the one-way valve hole, so that the diameter of the valve core is smaller, the contact area occupation ratio of the flat end opposite-top wave spring and the valve core is improved, and the opposite neutrality of the valve core is further improved.

Preferably, the buffer plunger is in a conical structure; the beneficial effects are that: the buffer plunger is arranged into a conical structure, the throttle gap between the buffer plunger and the buffer plunger hole can be reduced along with the increase of the buffer stroke after the buffer plunger enters the buffer plunger hole, so that the absorption of mechanical energy is uniform, the movement of the piston rod is gradually reduced, the throttle sound can be reduced slowly, and the vibration impact of the buffer tail end is small.

Preferably, a fixed inner groove for fixing the buffer plunger is arranged at the end part of the piston rod along the axial direction; the beneficial effects are that: the end part of the piston rod is provided with the fixed inner groove for fixing the buffer plunger, so that the piston rod and the buffer plunger are separated, the processing difficulty is reduced, and the buffer plunger is convenient to replace when damaged.

Further preferably, a clamping ring is fixed on the buffer plunger, and a clamping groove matched with the clamping ring is arranged in the fixed inner groove; the beneficial effects are that: the buffer plunger is fixed through the clamping and dismounting type clamping ring, and the buffer plunger can have micro-floating quantity along the axial direction and the circumferential direction, so that the buffer fit clearance can be properly enlarged, and the buffer performance is improved.

Preferably, a sealing ring is arranged on the sealing plug; the beneficial effects are that: the sealing effect of sealing plug is further promoted through setting up the sealing washer, prevents that the fluid of top from revealing and influences the buffering effect.

Preferably, the front end of the buffer plunger hole is in a conical structure; the beneficial effects are that: the front end of the buffer plunger hole is arranged into a conical structure, so that the gradient of a throttling gap is further improved, gradual buffer transition is realized, and the buffer plunger throttling sound is reduced.

Preferably, the bottom of the sealing plug is provided with an inner hexagonal hole; the beneficial effects are that: the bottom of the sealing plug is provided with an inner hexagonal hole, and the sealing plug can be conveniently screwed or loosened when the sealing plug is embedded into the cylinder body.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the miniature hydraulic cylinder buffer device, the flat end is selected to support the top wave spring, the spring is good in neutrality during rebound, and the centering of the flat end on the top wave spring is further enhanced through limiting the upper and lower first limiting grooves and the second limiting grooves, so that the centering of the valve core under different system flows is ensured; the conical valve core at the top is matched with the flat end opposite-pushing wave spring, so that the valve core of the hydraulic oil cylinder is good in neutrality and good in oil sealing effect under any installation angle state, and the problem that the gap property of the valve core with overlarge flow of a host system is free from buffering is avoided.

(2) The buffer plunger in the miniature hydraulic cylinder buffer device is in a conical structure and is matched with the buffer plunger hole, so that the buffer fit clearance is enlarged, the buffer throttling area is gradually reduced, the buffer throttling sound is reduced, and a relatively quiet operation environment is provided for users.

Drawings

Fig. 1 is a schematic structural diagram of a micro-hydraulic cylinder buffer device according to an embodiment;

FIG. 2 is a schematic structural view of a one-way valve hole according to an embodiment;

fig. 3 is a schematic diagram of the connection of the buffer plunger and the piston rod according to the embodiment.

In the figure: 1. a cylinder; 2. a piston rod; 3. buffering the plunger; 4. buffering the plunger hole; 5. a one-way valve hole; 6. a sealing plug; 7. flat end opposite top wave spring; 8. a valve core; 9. a first limit groove; 10. a through hole; 11. a first chamber; 12. a connection hole; 13. oil passing side holes; 14. an oil port is crossed; 15. the second limit groove; 16. a first shoulder; 17. a second chamber; 18. a second shoulder; 19. fixing the inner tank; 20. a clasp; 21. a clamping groove; 22. a seal ring; 23. and an inner hexagonal hole.

Detailed Description

The following description of the embodiments of the present patent will be made clearly and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present patent, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the one of ordinary skill in the art based on the embodiments of this patent, are within the scope of protection of this patent.

Examples

As shown in fig. 1, the present embodiment provides a non-small hydraulic cylinder buffer device, which specifically includes a cylinder body 1, a piston rod 2, a buffer plunger 3 and a buffer plunger hole 4; the bottom of the cylinder body 1 is provided with a one-way valve hole 5, and the one-way valve hole 5 is communicated with the buffer plunger hole 4 through an oil passing port 14; the bottom of the one-way valve hole 5 is in threaded connection with a sealing plug 6, and the sealing plug 6 is used for sealing the one-way valve hole 5 to prevent the leakage of oil in the one-way valve hole; the top of the sealing plug 6 is provided with a flat end opposite-top wave spring 7 along the axial direction; the top of the flat end opposite-top wave spring 7 is connected with a valve core 8; the top of the valve core 8 is in a conical structure, and the bottom of the valve core is provided with a first limit groove 9 which is matched with the flat end opposite-top wave spring 7; the valve core 8 is provided with a plurality of through holes 10 along the horizontal direction; a first chamber 11 is arranged between the valve core 8 and the sealing plug 6, and the first chamber 11 is communicated with the through hole 10 through a connecting hole 12 arranged along the axial direction; the through hole 10 and the connecting hole 12 can be used for guiding oil into a first chamber 11 formed by the valve core 8 and the sealing plug 6, when the buffer plunger 3 enters the buffer plunger hole 4, the oil in the first chamber 11 can generate upward pressure on the valve core 8, and the oil is matched with the flat-end opposite-pushing wave spring 7, so that the oil passing through the oil port 14 is firmly supported, and the oil in the one-way valve hole 5 is prevented from entering the buffer plunger hole 4; the side wall of the one-way valve hole 5 is provided with an oil passing side hole 13 for connecting the through hole 10 and the large cavity of the cylinder body 1, and the oil passing side hole 13 is used for enabling oil in the large cavity to enter the one-way valve hole 5 and oil in the buffer plunger hole 4 to enter the large cavity.

In the embodiment, the valve core 8 is adopted to replace a common steel ball, no obvious noise is generated when the valve core moves up and down, the top of the valve core 8 is in a conical structure, an oil passing port 14 connected with the buffer plunger hole 4 can be plugged, and the oil sealing effect is good; the flat end opposite-top wave spring 7 is an opposite-top wave spring which is flat up and down, compared with a common spring, the bearing capacity is stronger, at least half of the space can be saved when the same load is born, the centering is better when the spring is rebounded, the upper end of the flat end opposite-top wave spring 7 is connected with the valve core 8 through the first limiting groove 9 which is axially arranged, the two limiting grooves are mutually matched, the automatic centering of the valve core 8 can be realized under any installation angle, and the problem that the gap property is not buffered due to overlarge flow of a host system and the inclined valve core 8 is avoided.

The working principle of the buffer device of the utility model is as follows: in the reciprocating motion process of the piston rod 2, when the piston rod 2 reaches the stroke end to perform buffering (namely, the buffering plunger 3 enters the buffering plunger hole 4), oil in a large cavity of the cylinder body 1 flows into the one-way valve hole 5 from the oil passing side hole 13 and flows into the first cavity 11 through the through hole 10, the valve core 8 is subjected to the pressure of the flat-end opposite-pushing wave spring 7 and the elastic force and the oil in the first cavity 11, the oil passing port 14 communicated with the one-way valve hole 5 and the buffering plunger hole 4 can be sealed, the large-cavity oil can only flow into the buffering plunger hole 4 to form buffering, the speed is slowly reduced, and finally the cylinder body is slowly stopped. When the hydraulic cylinder is started quickly (namely, the buffer plunger 3 leaves the buffer plunger hole 4), oil enters the buffer plunger hole 4 from an oil port, oil flows out from a throttling gap formed by the buffer plunger 3 and the buffer plunger hole 4, when the pressure of the oil in the gap is larger than the elasticity of the flat end opposite-top wave spring 7, the spring is compressed, the oil pushes the valve core 8 to move, the one-way valve hole 5 is communicated with the oil port 14 communicated with the buffer plunger hole 4, and the oil in the buffer plunger hole 4 flows into a large cavity of the cylinder body 1 from the oil passing side hole 13 to push the piston rod 2 to move, so that quick starting is realized.

Alternatively, as shown in fig. 2, there are two through holes 10, and the two through holes 10 are perpendicular to each other.

Optionally, as shown in fig. 2, in order to further enhance the centering of the flat end against the top wave spring 7, the valve core 8 is ensured to keep good centering all the time under different system flows, and the top of the sealing plug 6 is provided with a second limit groove 15 adapted to the flat end against the top wave spring 7.

Optionally, as shown in fig. 2, the valve core 8 is provided with a first shoulder 16, a second chamber 17 is formed between the first shoulder 16 and the one-way valve hole 5, and the second chamber 17 is communicated with the oil passing side hole 13. The first shoulder 16 is arranged on the valve core 8, so that a second chamber 17 is formed before the valve core 8 and the one-way valve hole 5, and when the spring is compressed, the oil passing through the oil port 14 above conveniently flows into the oil passing side hole 13 at the side edge.

Optionally, as shown in fig. 2, a second land 18 is provided on the one-way valve hole 5, and the second land 18 is located below the valve core 8. The second shoulder 18 is arranged below the one-way valve hole 5, so that the diameter of the valve core 8 is smaller, the contact area ratio of the flat end opposite-top wave spring 7 and the valve core is increased, and the opposite neutrality of the valve core 8 is further improved.

Alternatively, as shown in fig. 3, the buffer plunger 3 has a conical structure. The buffer plunger 3 is arranged into a conical structure, and a throttling gap between the buffer plunger 3 and the buffer plunger hole 4 is reduced along with the increase of the buffer stroke, so that the absorption of mechanical energy is uniform, the movement of the piston rod 2 is gradually reduced, throttling sound can be reduced slowly, and the vibration impact of the buffer tail end is small.

Optionally, as shown in fig. 3, a fixed inner groove 19 for fixing the buffer plunger 3 is provided at an end of the piston rod 2 in an axial direction. The end part of the piston rod 2 is provided with the fixed inner groove 19 for fixing the buffer plunger 3, so that the piston rod 2 and the buffer plunger 3 can be separated, the processing difficulty is reduced, and the buffer plunger 3 is convenient to replace when damaged.

Further alternatively, as shown in fig. 3, a snap ring 20 is fixed on the buffer plunger 3, and a clamping groove 21 adapted to the snap ring 20 is provided in the fixed inner groove 19. The buffer plunger 3 is fixed through the clamping and dismounting type clamping ring 20, and the buffer plunger 3 can have micro-floating quantity along the axial direction and the circumferential direction, so that the buffer fit clearance can be properly enlarged, and the buffer performance is improved.

Optionally, as shown in fig. 2, a sealing ring 22 is disposed above the nut of the sealing plug 6. The sealing ring 22 can further improve the sealing effect of the sealing plug 6 and prevent the oil above from leaking to influence the buffering effect

Alternatively, as shown in fig. 1, the front end of the buffer plunger hole 4 has a conical structure. The front end of the buffer plunger hole 4 is provided with a conical structure, so that the gradient of a throttling gap is further improved, gradual buffer transition is realized, and the buffer plunger throttling sound is reduced.

Optionally, as shown in fig. 2, the bottom of the sealing plug 6 is provided with a hexagonal hole 23. The bottom of the sealing plug 6 is provided with an inner hexagonal hole 23, so that the sealing plug 6 can be conveniently screwed or loosened when the sealing plug 6 is embedded into the cylinder body 1.

The above examples describe in detail the practice of the utility model, but the utility model is not limited to the specific details of the above embodiments. Many simple modifications and variations of the technical solution of the present utility model are possible within the scope of the claims and technical idea of the present utility model, which simple modifications are all within the scope of the present utility model.

Claims (8)

1. The miniature hydraulic cylinder buffer device comprises a cylinder body, a piston rod and a buffer plunger, and is characterized in that the tail end of the cylinder body is provided with a buffer plunger hole; the side wall of the buffer plunger hole is provided with a one-way valve hole; a flat end opposite-top wave spring is arranged in the one-way valve hole; a sealing plug is arranged at one end of the flat end opposite-pushing wave spring, which is far away from the buffer plunger hole, and the flat end opposite-pushing wave spring is coaxial with the sealing plug; the other end of the flat end opposite-pushing wave spring is connected with a valve core; the top of the valve core is in a conical structure, and the bottom of the valve core is provided with a first limit groove matched with the flat end opposite-top wave spring; the valve core is provided with a plurality of through holes along the horizontal direction; a first cavity is arranged between the valve core and the sealing plug, and the first cavity is communicated with the through hole through a connecting hole arranged along the axial direction; and the side wall of the one-way valve hole is provided with an oil passing side hole for connecting the through hole and the large cavity of the cylinder body.

2. The miniature hydraulic cylinder buffer device according to claim 1, wherein the top of the sealing plug is provided with a second limit groove matched with the flat-end opposite-top wave spring.

3. The miniature hydraulic cylinder buffer device according to claim 1, wherein the valve core is provided with a first shoulder, a second chamber is arranged between the first shoulder and the one-way valve hole, and the second chamber is communicated with the oil passing side hole.

4. The miniature hydraulic cylinder buffer according to claim 1, wherein a second shoulder is arranged on the one-way valve hole, and the second shoulder is located below the valve core.

5. The miniature hydraulic cylinder cushioning device of claim 1, wherein the cushioning plunger is of conical configuration.

6. The miniature hydraulic cylinder buffering device according to claim 1, wherein a fixed inner groove for fixing the buffering plunger is provided at an end of the piston rod in an axial direction.

7. The miniature hydraulic cylinder buffer device according to claim 6, wherein a clamping ring is fixed on the buffer plunger, and a clamping groove matched with the clamping ring is arranged in the fixed inner groove.

8. The miniature hydraulic cylinder buffer according to claim 1, wherein a sealing ring is arranged on the sealing plug.