CN114576235A - Hydraulic cylinder and working machine - Google Patents
Hydraulic cylinder and working machine Download PDFInfo
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- CN114576235A CN114576235A CN202210332028.XA CN202210332028A CN114576235A CN 114576235 A CN114576235 A CN 114576235A CN 202210332028 A CN202210332028 A CN 202210332028A CN 114576235 A CN114576235 A CN 114576235A
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- piston
- guide
- sliding
- piston rod
- cylinder body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to the technical field of hydraulic elements and provides a hydraulic cylinder and an operating machine. The hydraulic cylinder comprises a cylinder body, a piston rod and a primary buffer structure; the first-level buffer structure comprises: the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod from one end, close to the piston, of the piston rod to the end far away from the piston; the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body and is propped against the buffer inclined plane; and the first elastic piece is respectively connected with the cylinder body and the sliding block and is used for driving the sliding block to the direction close to the guide piece. Under the effect of one-level buffer structure, the slider provides the resistance for the guide to slow down the speed of piston, and then avoid piston and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging.
Description
Technical Field
The invention relates to the technical field of hydraulic elements, in particular to a hydraulic cylinder and an operating machine.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion. When the piston moves to the tail end of the stroke of the cylinder barrel along with the piston rod, the piston can collide with the sealing cover, so that the hydraulic cylinder generates larger noise and vibration, and the hydraulic cylinder is damaged
Therefore, how to solve the problem that the piston is easy to collide with the cylinder head is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a hydraulic cylinder and an operating machine, which are used for overcoming the defect that a piston is easy to collide with a cylinder cover in the prior art, and achieving the effects of buffering the piston and preventing the piston from colliding with the cylinder cover.
The invention provides a hydraulic cylinder, which comprises a cylinder body, a piston rod and a primary buffer structure, wherein the piston rod is arranged on the cylinder body; the primary buffer structure includes:
the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod from one end, close to the piston, of the piston rod to the end far away from the piston;
the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body and abuts against the buffer inclined plane;
the first elastic piece is respectively connected with the cylinder body and the sliding block and used for driving the sliding block towards the direction close to the guide piece.
The hydraulic cylinder further comprises a secondary buffering structure, wherein the secondary buffering structure comprises a second elastic piece;
the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can abut against the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.
The hydraulic cylinder further comprises a sliding piece and a positioning structure;
the sliding part is sleeved between the guide part and the piston rod and is respectively in sliding fit with the guide part and the piston rod;
the positioning structure is connected with one end, close to the piston, of the guide piece, the positioning structure is sleeved on the piston rod, a gap is formed between the positioning structure and the piston rod, and the positioning structure and one end, close to the piston, of the sliding piece can be switched between an abutting state and an interval state.
According to the hydraulic cylinder provided by the invention, the outer circumferential surface of one end, close to the piston, of the sliding piece is provided with the annular flange, and the guide piece is provided with the annular groove for placing the annular flange.
According to the hydraulic cylinder provided by the invention, the annular flange is provided with the pressure relief hole which is arranged along the axial direction of the sliding piece in a penetrating way;
the pressure relief hole is provided opposite to a gap between the slider and the guide.
According to the hydraulic cylinder provided by the invention, the hydraulic cylinder further comprises a second elastic piece;
the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can be connected with the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.
According to the hydraulic cylinder provided by the invention, the guide piece comprises a guide sleeve sleeved on the piston rod and a sliding ring sleeved on the guide sleeve, and the buffer inclined plane is arranged on the sliding ring;
the guide sleeve is provided with a shaft shoulder, and the shaft shoulder is abutted to one end, close to the piston, of the sliding ring.
The hydraulic cylinder further comprises a guide rod connected with the cylinder body, and the first elastic piece and the sliding block are sleeved on the guide rod;
the sliding ring is provided with a wedge-shaped block, the inclined plane of the wedge-shaped block is arranged as the buffering inclined plane, the wedge-shaped block is provided with a sliding groove for the guide rod to extend into, and the sliding groove is arranged along the axial extension of the piston rod.
According to the hydraulic cylinder provided by the invention, sliding sealing structures are arranged between the sliding part and the piston rod, between the sliding part and the guide part and between the guide part and the cylinder body.
According to the hydraulic cylinder provided by the invention, the positioning structure comprises the cushion pad and the fixed sleeve, the fixed sleeve is in threaded fit with the guide part, the cushion pad is arranged between the fixed sleeve and the sliding part, and the cushion pad is connected with the fixed sleeve;
and/or the sliding part comprises a free piston and a spacer bush, the free piston is arranged at one end close to the piston, and the spacer bush is arranged at one end far away from the piston.
The invention also provides a working machine comprising the hydraulic cylinder.
According to the hydraulic cylinder provided by the invention, by arranging the primary buffer structure, the piston can abut against the guide piece in the extending process of the piston rod, and the piston drives the guide piece to synchronously move. In the process of the movement of the guide piece, the buffer inclined plane of the guide piece interacts with the sliding block, and the buffer inclined plane drives the sliding block to move towards the direction far away from the piston rod and compress the first elastic piece. Under the effect of first elastic component, the slider provides the resistance for the guide to slow down the speed of piston, and then avoid piston and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging, the life of extension pneumatic cylinder.
Specifically, the present invention provides a working machine including the hydraulic cylinder, which includes all the advantages of the hydraulic cylinder.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, 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 block diagram of a hydraulic cylinder provided in some embodiments of the present invention;
FIG. 2 is an enlarged view of section I of FIG. 1;
FIG. 3 is an enlarged view of section II of FIG. 2;
FIG. 4 is a schematic view showing an installation state of the slider and the first elastic member provided in some embodiments of the present invention
Fig. 5 is a schematic view of the arrangement of slip rings and wedge blocks provided in some embodiments of the present invention.
Reference numerals:
1. a cylinder barrel; 2. a connecting member; 3. an end cap; 4. a gland; 5. a piston; 6. a piston rod; 7. a buffer bevel; 8. a slider; 9. a first elastic member; 10. an annular flange; 11. an annular groove; 12. a pressure relief vent; 13. a second elastic member; 14. a guide sleeve; 15. a slip ring; 16. a shaft shoulder; 17. a guide bar; 18. a wedge block; 19. a cushion pad; 20. fixing a sleeve; 21. a free piston; 22. a spacer sleeve; 23. a cushion ring; 24. a steel wire sleeve; 25. a chute; 26. a limiting sleeve; 27. and (4) a hole shoulder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The hydraulic cylinder provided in the embodiment of the present invention is described below with reference to fig. 1 to 5.
Specifically, the hydraulic cylinder includes a cylinder body, a piston 5, a piston rod 6, and a primary cushion structure. The primary buffer structure comprises a guide part, a slide block 8 and a first elastic part 9.
Alternatively, the cylinder block may include a cylinder tube 1, a connecting member 2, an end cap 3, and a gland 4.
Referring to fig. 1, the cylinder 1, the connecting member 2, the end cap 3 and the gland 4 are sequentially connected from top to bottom, and any adjacent two may be connected by a threaded fastener.
Further, an oil port having a rod chamber may be provided on the connection member 2.
The piston 5 is slidably provided in the cylinder. Specifically, the piston 5 is slidably disposed inside the cylinder tube 1. A sliding sealing structure is arranged between the piston 5 and the cylinder barrel 1.
A first end of a piston rod 6 is connected to the piston 5 and a second end of the piston rod 6 extends from the cylinder. Specifically, the second end of the piston rod 6 passes through the connecting member 2, the end cap 3 and the gland 4 in sequence and extends out.
The guide is slidably disposed within the cylinder, and the guide is slidably fitted outside the piston rod 6. The end of the guide near the piston 5 can be against the piston 5. The guide is provided with a buffering bevel 7, and the buffering bevel 7 gradually inclines towards the direction approaching the piston rod 6 from the end of the piston rod 6 approaching the piston to the end far away from the piston.
The sliding block 8 is connected with the cylinder body in a sliding way along the radial direction of the cylinder body, and the sliding block 8 is abutted against the buffer inclined plane 7.
Optionally, the end cap 3 is provided with a hole shoulder 27 and a position-limiting sleeve 26, wherein a gap is provided between the position-limiting sleeve 26 and the hole shoulder 27, and the sliding block 8 is slidably arranged between the hole shoulder 27 and the position-limiting sleeve 26. Further, one end of the position limiting sleeve 26 abuts against the connecting piece 2, and the other end of the position limiting sleeve abuts against the protruding structure on the inner wall of the end cover 3, that is, the position limiting sleeve 26 is pressed and fixed by the end cover 3 and the connecting piece 2, so that a space for the sliding of the sliding block 8 is formed between the position limiting sleeve 26 and the hole shoulder 27.
The first elastic member 9 is connected to the cylinder and the slider 8, respectively, and the first elastic member 9 is used to drive the slider 8 in a direction close to the guide. For example, the first elastic member 9 may be provided as a spring.
Referring to fig. 1, in the hydraulic cylinder provided in the embodiment of the present invention, by providing a primary buffer structure, the piston 5 can abut against the guide during the process of extending the piston rod 6, and the piston 5 drives the guide to synchronously displace. In the process of moving the guide piece, the buffer inclined plane 7 of the guide piece interacts with the slide block 8, and the buffer inclined plane 7 drives the slide block 8 to move towards the direction far away from the piston rod 6 and compress the first elastic piece 9. Under the effect of first elastic component 9, slider 8 provides the resistance for the guide to slow down piston 5's speed, and then avoid piston 5 and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging, the life of extension pneumatic cylinder.
Further, the angle between the damping ramp 7 and the direction of extension of the piston rod 6 is less than 45 °. With this arrangement, when the piston 5 travels a unit length distance in a state where the piston 5 abuts against the guide, the slider 8 travels a unit length distance less than the unit length, and the compression amount of the corresponding spring is less than the unit length. So, can carry out the flexible buffering to piston 5, avoid making piston 5 scram and losing the meaning of buffering too big to piston 5's buffering, can avoid piston 5 scram and produce the noise problem that hydraulic shock caused simultaneously.
Referring to fig. 4 and 5, further, the sliding blocks 8 and the first elastic members 9 are provided in plurality and are in one-to-one correspondence. The plurality of sliders 8 are evenly distributed along the circumferential direction of the guide.
By such an arrangement, the buffering and decelerating effect on the piston 5 can be improved, and the stress on the piston 5 is uniform.
Referring to fig. 1, in some embodiments provided by the present invention, the outer surface of the guide is provided with a shoulder 16. The cylinder body is provided with a locating surface for abutting against the end of the shoulder 16 adjacent the piston 5. For example, the locating surface may be provided as an end surface of the end of the connector 2 adjacent the end cap 3.
So set up, at the in-process that piston rod 6 contracts along with piston 5, the guide resets under the drive of slider 8 and offsets with the locating surface, through offsetting with connecting piece 2, can avoid the guide to continue the displacement along with piston rod 6 and lead to the problem that buffering inclined plane 7 and slider 8 break away from each other.
Referring to fig. 1, in some embodiments provided by the present invention, the guide member includes a guide sleeve 14 fitted over the piston rod 6 and a slip ring 15 fitted over the guide sleeve 14, and the buffering slope 7 is provided to the slider 8. The guide sleeve 14 can abut against the piston 5.
The shaft shoulder 16 is arranged on the guide sleeve 14, and one end of the slip ring 15 close to the piston 5 is abutted against the shaft shoulder 16.
The piston rod 6 can be guided by providing a guide sleeve 14. During the process of extending the piston rod 6, the piston 5 abuts against the guide sleeve 14 and pushes the guide sleeve 14 to move, and the shaft shoulder 16 of the guide sleeve 14 pushes the slide ring 15 to move, so that the buffer inclined plane 7 of the slide ring 15 drives the slide block 8 to compress the first elastic element 9. When the piston rod 6 retracts, the first elastic part 9 restores to deform and drives the sliding block 8 to displace, the sliding block 8 pushes the sliding ring 15 to move, and the sliding ring 15 pushes the shaft shoulder 16 to abut against the connecting piece 2.
With this arrangement, when the buffering inclined surface 7 is worn or damaged, only the slide ring 15 can be replaced without replacing the guide sleeve 14. Likewise, when the guide sleeve 14 is worn or damaged, only the guide sleeve 14 may be replaced without replacing the slide ring 15. Thus, the maintenance cost of the hydraulic cylinder can be reduced.
Further, in order to enable a better connection of the slide ring 15 to the guide sleeve 14, the slide ring can be reliably and accurately reset. Referring to fig. 3, the hydraulic cylinder further comprises a wire sleeve 24, and the wire sleeve 24 is sleeved on the guide sleeve 14 and abuts against one end of the sliding ring 15 far away from the piston 5. The slide ring 15 can always be displaced synchronously with the guide sleeve 14 by the interaction of the wire sleeve 24 and the shoulder 16.
In some embodiments provided by the present invention, the hydraulic cylinder further comprises a secondary damping structure comprising a second elastic member 13.
The second elastic element 13 is disposed in the cylinder, a first end of the second elastic element 13 is connected to the cylinder, a second end of the second elastic element 13 can abut against the guide, and the second elastic element 13 is used for driving the guide to an end of the guide close to the piston 5.
Therefore, in the process of extending the piston rod, after the piston 5 pushes the guide part to be connected with the second elastic part 13, the piston 5 can be simultaneously buffered under the combined action of the primary buffer structure and the secondary buffer structure, and larger impact force can be effectively born, so that the piston 5 stops moving.
Referring to FIG. 1, in some embodiments provided by the present disclosure, the hydraulic cylinder further includes a slide and a positioning structure.
The sliding part is sleeved between the guide part and the piston rod 6 and is respectively in sliding fit with the guide part and the piston rod 6. Specifically, the sliding member is fitted between the guide sleeve 14 and the piston rod 6, and the guide sleeve 14 guides the piston rod 6 via the sliding member.
The positioning structure is connected to the end of the guide near the piston 5. For example, the locating structure is connected to the end of the guide sleeve 14 adjacent the piston 5. The positioning structure is sleeved on the piston rod 6, and a gap is formed between the positioning structure and the piston rod 6. The positioning structure and the end of the slider close to the piston 5 can be switched between an abutting state and a spaced state.
Referring to fig. 1, the operation principle includes: in the process that the piston rod 6 extends out, when the piston 5 does not abut against the guide sleeve 14, high-pressure hydraulic oil in the rod cavity enters between the positioning structure and the sliding part from a gap between the positioning structure and the piston rod 6, at the moment, the sliding part can abut against the gland 4 or the second elastic part 13 of the cylinder body under the driving of the hydraulic oil, and the sliding part and the positioning structure are in an interval state.
When the piston 5 is abutted to the guide sleeve 14, the positioning structure moves towards the direction close to the sliding part, so that the spacing distance between the sliding part and the positioning structure is reduced, at the moment, hydraulic oil between the sliding part and the positioning structure is extruded to enter the rod cavity from the gap between the positioning structure and the piston rod 6, and the hydraulic oil acts on the piston 5 to play a role in buffering the piston 5.
When the positioning structure runs to the position where the distance between the positioning structure and the sliding part is zero, the positioning structure and the sliding part are in an abutting state, and at the moment, one end of the sliding part, which is far away from the piston 5, abuts against the cylinder body or the second elastic part 13, so that the positioning structure stops under the limit of the sliding part, and the piston 5 stops at the same time.
So set up, can utilize the hydraulic oil between location structure and the slider to play the effect of flexible buffering to piston 5, so, can effectively avoid on the one hand when piston 5 momentum is too big, slider 8 and buffering inclined plane 7 response lead to producing too big striking and lead to structural damage's problem between each structure too fast. Meanwhile, the piston 5 can be prevented from suddenly stopping due to overlarge buffering generated by interaction of the sliding block 8 and the buffering inclined plane 7, and the oil cylinder is prevented from losing buffering significance due to rigid impact generated in the cylinder barrel 1.
Further, when the positioning structure is in an abutting state with the sliding part, one end of the sliding part, which is far away from the piston, protrudes out of one end of the guide part, which is far away from the piston. So can make location structure and slider offset at the in-process that the piston rod stretches out to can discharge the hydraulic oil between location structure and the slider completely, and then form better buffering effect to the piston.
It should be noted that, as shown in fig. 1, for a hydraulic cylinder provided with a secondary buffer structure, the sliding part may abut against the secondary buffer structure, that is, in this case, the guiding part abuts against the second elastic part 13 through the sliding part. For a hydraulic cylinder without a secondary buffer structure, the sliding part can abut against the cylinder body, that is, the guide part abuts against the cylinder body through the sliding part.
Alternatively, the second elastic member 13 is provided as a disc spring.
Further, the gland 4 is provided with a mounting groove for mounting the belleville spring.
In some embodiments provided by the present invention, the positioning structure includes a cushion pad 19 and a retainer sleeve 20.
The retaining sleeve 20 is threadedly engaged with the guide. For example, the end of the guide sleeve 14 close to the piston 5 is provided with an internal thread, the outer wall of the fixing sleeve 20 is provided with an external thread matching said internal thread, and the fixing sleeve 20 is screwed inside the end of the guide sleeve 14 close to the piston 5.
The cushion pad 19 is disposed between the harness 20 and the slider, and the cushion pad 19 is connected with the harness 20. For example, the cushion 19 may be connected to the harness 20 by means of a threaded fastener connection.
Because the location structure needs often contradict with the slider each other, and the atress condition is comparatively complicated, through setting up location structure into blotter 19 and fixed cover 20, make blotter 19 as with slider complex part, make fixed cover 20 as the part of being connected with the guide, can be to blotter 19 and the corresponding different materials of using of fixed cover 20 on the one hand to satisfy the user demand better, on the other hand be convenient for corresponding change parts that damage easily, and need not to change all parts.
Referring to fig. 1 and 2, in some embodiments of the present invention, an annular flange 10 is provided on the outer circumferential surface of the sliding member near one end of the piston 5, and an annular groove 11 into which the annular flange 10 is inserted is provided on the guide member.
The contact area between the sliding piece and the positioning structure can be increased by arranging the annular flange 10, so that the stress condition between the positioning structure and the annular flange 10 is improved, and the damage of the positioning structure and the annular flange 10 is reduced.
Referring to fig. 1 and 2, in some embodiments provided by the present invention, the annular flange 10 is provided with a pressure relief hole 12 disposed through the slider in the axial direction thereof.
The relief hole 12 is provided opposite to the gap between the slider and the guide.
By providing the pressure relief hole 12, on one hand, in the process of extending the piston rod 6, the hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 can be quickly discharged from the pressure relief hole 12, and the hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 is prevented from obstructing the movement of the sliding part. On the other hand, when the annular flange 10 abuts against the side wall of the annular groove 11, hydraulic oil in a gap between the sliding part and the guide part can be discharged from the pressure relief hole 12, so that the problem that the gap between the sliding part and the guide part is instantaneously high-pressure formed to break down a sealing structure between the sliding part and the guide part due to the rapid abutment of the annular flange 10 and the side wall of the annular groove 11 is solved.
Referring to fig. 1, in some embodiments provided by the present invention, the hydraulic cylinder further includes a cushion ring 23. A damping ring 23 is connected to the end of the positioning structure near the piston 5. That is, the positioning structure abuts against the piston 5 via the cushion ring 23.
For example, the cushion ring 23 may be connected to the guide sleeve 14 by a threaded fastener, and the cushion ring 23 abuts the retaining sleeve 20. The cushion ring 23 has a clearance with the piston rod 6.
By providing a damping ring 23, as shown in fig. 1, it is on the one hand facilitated that the guide engages against the piston 5 via the damping ring 23. On the other hand, after the buffering ring 23 is arranged, in the process that the guide sleeve 14 is extruded, hydraulic oil between the sliding part and the positioning structure needs to sequentially pass through a gap between the positioning structure and the piston rod 6 and a gap between the buffering ring 23 and the piston rod 6 and then enters the rod cavity, so that the running path of the hydraulic oil is prolonged, the discharge resistance of the hydraulic oil between the positioning structure and the sliding part is increased, and the buffering effect on the piston 5 is improved.
Referring to fig. 1, 3 and 4, in some embodiments provided by the present invention, the hydraulic cylinder further includes a guide rod 17 connected to the cylinder body. The first elastic element 9 and the slide block 8 are sleeved on the guide rod 17. The first elastic member 9 and the slider 8 can be prevented from displacement play by fitting the first elastic member 9 and the slider 8 to the guide rod 17.
The sliding ring 15 is provided with a wedge block 18, the inclined surface of the wedge block 18 is set as a buffering inclined surface 7, the wedge block 18 is provided with a sliding groove 25 for the guide rod 17 to extend into, and the sliding groove 25 extends along the axial direction of the piston rod 6. The guide rod 17 extends into the sliding groove 25, so that the problem that the sliding ring 15 rotates around the guide piece to cause the displacement of the wedge block 18 and the sliding block 8 can be prevented.
Further, the number of the wedge blocks 18 is set to be plural and corresponds to the slide block 8 one by one.
Referring to fig. 1, in some embodiments provided by the present invention, sliding seal structures are provided between the slider and the piston rod 6, between the slider and the guide, and between the guide and the cylinder. Through setting up sliding seal structure, can prevent to have the hydraulic oil of pole intracavity to leak from any one of above three to improve the sealed effect of pneumatic cylinder.
Referring to fig. 1, in some embodiments provided by the present invention, the slider includes a free piston 21 and a spacer 22. The free piston 21 is disposed near one end of the piston. For example, the free piston 21 is intended to abut against a positioning structure. The spacer 22 is disposed at the end remote from the piston. The spacer 22 is intended to abut against a cylinder, for example. For example, a fitting dimension is provided between the free piston 21 and the piston rod 6, and the sliding seal structure is provided between the free piston 21 and the piston rod 6. While spacer 22 may not be provided with a matching dimension with piston rod 6, e.g. a gap is provided between spacer 22 and piston rod 6, spacer 22 being used only for force transmission.
With this arrangement, the machining accuracy of the free piston 21 can be improved, and the machining accuracy of the spacer 22 can be reduced. Thus, on the one hand, the processing difficulty and the processing cost of the sliding part can be reduced, and on the other hand, after the free piston 21 or the spacer 22 is damaged, the damaged part can be replaced without integrally replacing the sliding part.
The invention also provides a working machine.
Specifically, the work machine includes the hydraulic cylinder as described above.
It should be noted that the work machine includes the hydraulic cylinder and also includes all the advantages of the hydraulic cylinder, and the description thereof is omitted.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a hydraulic cylinder, its characterized in that, includes cylinder body, piston rod and one-level buffer structure, one-level buffer structure includes:
the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod from one end, close to the piston, of the piston rod to the end far away from the piston;
the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body, and the sliding block is abutted against the buffer inclined plane;
the first elastic piece is respectively connected with the cylinder body and the sliding block and used for driving the sliding block towards the direction close to the guide piece.
2. The hydraulic cylinder of claim 1, further comprising a secondary dampening structure comprising a second resilient member;
the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can abut against the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.
3. The hydraulic cylinder of claim 1 or 2, further comprising a slide and a positioning structure;
the sliding part is sleeved between the guide part and the piston rod and is respectively in sliding fit with the guide part and the piston rod;
the positioning structure is connected with one end, close to the piston, of the guide piece, the positioning structure is sleeved on the piston rod, a gap is formed between the positioning structure and the piston rod, and the positioning structure and one end, close to the piston, of the sliding piece can be switched between a propping state and a spacing state.
4. The hydraulic cylinder according to claim 3, wherein an outer circumferential surface of an end of said sliding member adjacent to said piston is provided with an annular flange, and said guide member is provided with an annular groove into which said annular flange is inserted.
5. The hydraulic cylinder according to claim 4, wherein the annular flange is provided with a relief hole provided through in an axial direction of the slider;
the pressure relief hole is provided opposite to a gap between the slider and the guide.
6. The hydraulic cylinder of claim 1, wherein the guide member comprises a guide sleeve fitted to the piston rod and a slip ring fitted to the guide sleeve, and the buffering slope is provided to the slip ring;
the guide sleeve is provided with a shaft shoulder, and the shaft shoulder is abutted to one end, close to the piston, of the sliding ring.
7. The hydraulic cylinder of claim 6, further comprising a guide rod connected to the cylinder body, wherein the first elastic member and the sliding block are both sleeved on the guide rod;
the sliding ring is provided with a wedge-shaped block, the inclined plane of the wedge-shaped block is arranged as the buffering inclined plane, the wedge-shaped block is provided with a sliding groove for the guide rod to extend into, and the sliding groove is arranged along the axial extension of the piston rod.
8. The hydraulic cylinder of claim 3, wherein sliding seal structures are provided between the slider and the piston rod, between the slider and the guide, and between the guide and the cylinder body.
9. The hydraulic cylinder of claim 3, wherein the positioning structure comprises a cushion pad and a sleeve, the sleeve is threadedly engaged with the guide, the cushion pad is disposed between the sleeve and the slide, and the cushion pad is connected to the sleeve;
and/or the sliding part comprises a free piston and a spacer bush, the free piston is arranged at one end close to the piston, and the spacer bush is arranged at one end far away from the piston.
10. A work machine, characterized by comprising a hydraulic cylinder according to any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332028.XA CN114576235A (en) | 2022-03-30 | 2022-03-30 | Hydraulic cylinder and working machine |
| PCT/CN2022/116421 WO2023184854A1 (en) | 2022-03-30 | 2022-09-01 | Hydraulic cylinder and working machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332028.XA CN114576235A (en) | 2022-03-30 | 2022-03-30 | Hydraulic cylinder and working machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114576235A true CN114576235A (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210332028.XA Pending CN114576235A (en) | 2022-03-30 | 2022-03-30 | Hydraulic cylinder and working machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114576235A (en) |
| WO (1) | WO2023184854A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184854A1 (en) * | 2022-03-30 | 2023-10-05 | 娄底市中兴液压件有限公司 | Hydraulic cylinder and working machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2766615B2 (en) * | 1993-10-18 | 1998-06-18 | エスエムシー株式会社 | Cylinder device |
| CN206290528U (en) * | 2016-12-15 | 2017-06-30 | 安徽科海压缩机制造有限公司 | A kind of buffering hydraulic cylinder assembly |
| CN107120333B (en) * | 2017-06-26 | 2018-12-04 | 泸州长江油缸制造有限公司 | The self-locking hydraulic cylinder being mounted on lifting device |
| CN207640969U (en) * | 2017-11-25 | 2018-07-24 | 华强方特（芜湖）文化科技有限公司 | A kind of tractor buffer unit |
| CN209414302U (en) * | 2018-12-29 | 2019-09-20 | 重庆维庆液压机械有限公司 | A kind of buffering hydraulic cylinder |
| CN111676807A (en) * | 2020-07-16 | 2020-09-18 | 重庆科技学院 | Anti-collision bridge pier |
| CN114576235A (en) * | 2022-03-30 | 2022-06-03 | 娄底市中兴液压件有限公司 | Hydraulic cylinder and working machine |
-
2022
- 2022-03-30 CN CN202210332028.XA patent/CN114576235A/en active Pending
- 2022-09-01 WO PCT/CN2022/116421 patent/WO2023184854A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184854A1 (en) * | 2022-03-30 | 2023-10-05 | 娄底市中兴液压件有限公司 | Hydraulic cylinder and working machine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023184854A1 (en) | 2023-10-05 |
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