CN217783914U - Full-stroke locking hydraulic oil cylinder - Google Patents
Full-stroke locking hydraulic oil cylinder Download PDFInfo
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- CN217783914U CN217783914U CN202221947266.3U CN202221947266U CN217783914U CN 217783914 U CN217783914 U CN 217783914U CN 202221947266 U CN202221947266 U CN 202221947266U CN 217783914 U CN217783914 U CN 217783914U
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Abstract
A full-stroke locking hydraulic oil cylinder comprises a cylinder barrel, a piston rod assembly, a guide sleeve and a cylinder bottom assembly; the piston rod assembly is assembled by an expansion sleeve, a piston and a piston rod and is fixed by a large nut; the cylinder bottom component is composed of a cylinder bottom, an oil plug and a tail end gland, is in threaded connection and fixed at the bottom of the cylinder barrel, and increases the looseness prevention of a set screw. An unlocking cavity oil port, a rod cavity oil port and a rodless cavity oil port are machined on the cylinder barrel; the oil port of the unlocking cavity is connected with the cylinder bottom, is directly communicated with the inner hole of the piston rod through an oil guide pipe and finally acts on the locking cavity through the oil hole of the expansion sleeve; the oil port of the rod cavity is connected with the annular groove of the guide ring and is directly communicated with the rod cavity in the oil cylinder, and the oil port of the rodless cavity is directly communicated with the rodless cavity; the tight cover that expands is installed in the piston rod afterbody to both ends all are equipped with the piston, make between two pistons, expand tight cover external diameter and cylinder inner wall stroke locking and unlock the chamber, the utility model discloses a can realize the full stroke locking of pneumatic cylinder, the locking effect is stable.
Description
Technical Field
The utility model relates to a machine-building field specifically belongs to a full stroke locking hydraulic cylinder.
Background
Common hydraulic cylinder locking modes are divided into mechanical locking and hydraulic control locking, the mechanical locking can only be locked at a fixed position generally, the full-stroke locking is difficult to realize, even if the full-stroke locking is realized, the locking or unlocking failure of the hydraulic cylinder is easily caused due to the clamping stagnation of a mechanical device, and the hydraulic control locking can realize the full-stroke locking by controlling the hydraulic circuit locking through a hydraulic element, but the hydraulic cylinder and the hydraulic element can not avoid leakage to a certain degree, so that the hydraulic locking mode can not realize the long-time stable locking.
Disclosure of Invention
An object of the utility model is to overcome the not enough of above-mentioned pneumatic cylinder locking mode, and provide a full stroke locking hydraulic cylinder, can realize the full stroke locking of pneumatic cylinder, the locking effect is stable.
The technical scheme of the utility model is that: an expansion sleeve is sleeved outside a piston rod in the cylinder barrel, the outer diameter of the expansion sleeve is in interference fit with the inner wall of the cylinder barrel, an unlocking cavity oil port is arranged on the cylinder barrel, an unlocking cavity oil way for expanding the wall part of the cylinder barrel in interference fit with the outer diameter of the expansion sleeve through hydraulic oil is arranged in the cylinder barrel, and the position of the unlocking cavity is arranged between the outer diameter of the expansion sleeve and the inner wall part of the cylinder barrel in interference fit with the outer diameter of the expansion sleeve; one port of the unlocking cavity oil way is communicated with the unlocking cavity oil port, and the other port of the unlocking cavity oil way corresponds to the unlocking cavity;
when an oil port of the unlocking cavity is an oil inlet, the oil liquid flows to the position of the unlocking cavity along the oil path of the unlocking cavity, the inner wall part of the cylinder barrel in interference fit with the outer diameter of the expansion sleeve elastically deforms and expands under the action of oil pressure, the outer diameter of the expansion sleeve is in clearance fit with the inner wall of the cylinder barrel to form the unlocking cavity, and the piston rod is in an unlocking state;
when the oil port of the unlocking cavity is the oil outlet, the unlocking cavity is unloaded, the inner wall of the cylinder barrel and the outer wall of the expansion sleeve recover interference fit, and the piston rod is in a locking state.
An oil guide pipe is arranged on the cylinder bottom, an inner hole for the oil guide pipe to move is formed in the tail end of the piston rod, and the oil guide pipe extends into the inner hole; the oil passing holes are formed in the expansion sleeve and the piston rod, an unlocking cavity oil path is formed between the oil guide pipe and the inner hole of the piston rod, the unlocking cavity oil port is communicated with one port of the unlocking cavity oil path, and the other port of the unlocking cavity oil path corresponds to the position of the unlocking cavity through the oil passing holes in the piston rod and the expansion sleeve.
The oil guide pipe extends into the inner hole; the cylinder barrel is provided with an unlocking cavity oil port, a rodless cavity oil port and three oil ports of a rod cavity oil port, an expansion sleeve is arranged between two pistons on the piston rod, the tail end of the oil guide pipe is provided with an oil plug, the oil guide pipe is provided with an unlocking cavity oil passing groove on the contact surface with the oil plug, the cylinder bottom is further provided with a connecting oil duct communicated with the unlocking cavity oil port and the unlocking cavity oil passing groove, and the unlocking cavity oil port is communicated with one end port of an unlocking cavity oil path through the unlocking cavity oil passing groove, the connecting oil duct and the unlocking cavity oil path.
The end gland is connected with the bottom of the cylinder barrel in a sealing way.
The two pistons are arranged at the tail part of the piston rod and distributed at two sides of the expansion sleeve, and are tightly pressed at the tail part of the piston rod by large nuts, and the inner diameter and the outer diameter of each set of piston are dynamically sealed.
A plurality of outer oil passing holes are uniformly distributed in the waist of the expansion sleeve, a plurality of inner oil passing holes corresponding to the outer oil passing holes are uniformly distributed on the piston rod, and annular oil passing grooves are formed in the outer diameter of the expansion sleeve at the outer oil passing holes and in the positions of the piston rod outer diameter corresponding to the inner oil passing holes.
And a static seal is arranged on the contact surface of the oil guide pipe and the cylinder bottom, and a dynamic seal is arranged at the tail part of the piston rod to prevent the leakage in the unlocking oil way.
For guaranteeing that the oil port of the unlocking cavity can stably supply oil to the unlocking cavity, the inner hole of the piston rod is larger than the outer diameter of the oil guide pipe by more than 4mm, and the depth of the inner hole of the piston rod is longer than the length of the oil guide pipe by more than 20mm, so that the oil guide pipe and the bottom of the hole of the piston rod are prevented from being cut off, and the unlocking cavity is prevented from being cut off.
The cylinder bottom assembly is composed of a cylinder bottom, an oil plug used for sealing the tail end of the oil guide pipe and a tail end gland, the cylinder bottom assembly is fixed at the bottom of the cylinder barrel in a threaded connection mode, a step hole is formed in the cylinder bottom and comprises a large hole portion located at the tail portion and a small hole portion located at the front portion, the large step portion at the tail portion of the oil guide pipe is arranged in the large hole portion, the small hole portion penetrates through the small hole portion in the middle portion of the oil guide pipe, and the small portion at the front portion of the oil guide pipe extends into the inner hole.
The utility model discloses full stroke locking pneumatic cylinder relies on the frictional force that tight cover and cylinder between the interference fit produced to realize locking function, and frictional force is frictional surface's normal pressure F, coefficient of friction and friction area three's product. When the oil port of the unlocking cavity is not supplied with oil, the oil port of the unlocking cavity is in interference fit with the cylinder barrel, the hydraulic cylinder is in a locking state, when high-pressure oil is filled into the unlocking cavity, the cylinder barrel is elastically deformed at the position of the unlocking cavity, the hydraulic cylinder is unlocked automatically, the high-pressure oil is removed, the cylinder barrel of the unlocking cavity recovers deformation, and the hydraulic cylinder is locked by means of friction force of the cylinder barrel and the expansion sleeve.
The utility model provides a general locking return circuit not enough under the special operating mode, realized the long-time reliable locking function of pneumatic cylinder full stroke, simple structure, convenient to use, job stabilization is reliable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of an oil circuit;
FIG. 3 is a schematic view of an unlocking chamber;
FIG. 4 is a schematic view of an end seal of the oil pipe;
FIG. 5 is a schematic structural view of the expansion sleeve;
fig. 6 is a schematic view of the rod end oil hole.
Detailed Description
In fig. 1-3, the full-stroke hydraulic locking cylinder includes a cylinder barrel 8, a piston rod assembly, a guide sleeve 9, and a cylinder bottom assembly. The piston rod assembly is assembled by an expansion sleeve 5, a piston 6 and a piston rod 11 and is fixed by a large nut 16; the cylinder bottom component is composed of a cylinder bottom 3, an oil plug 2 and a tail end gland 1, is in threaded connection and fixed at the bottom of the cylinder barrel 8, and increases the looseness prevention of a set screw. The cylinder barrel 8 is provided with three oil ports, namely an unlocking cavity oil port 17, a rodless cavity oil port 18 and a rod cavity oil port 19, an expansion sleeve 5 is arranged between two pistons 6 on a piston rod 11, an unlocking oil way oil guide pipe 7 is arranged on a cylinder bottom 3, the tail end of the oil guide pipe is sealed by an oil plug 2, finally a tail end gland 1 is connected with a fastening screw through threads and is installed at the bottom of the oil cylinder in a locking manner, and an inner hole for the oil guide pipe 7 to move is machined at one end of the piston rod 11. For guaranteeing that the oil port of the unlocking cavity can supply oil stably to the unlocking cavity, the inner hole of the piston rod 11 is larger than the outer diameter of the oil guide pipe 7 by more than 4mm, the depth is longer than the effective length of the oil guide pipe 7 by more than 20mm, and the inner hole and the opening part are provided with small guide sleeves to prevent leakage of the rodless cavity and the unlocking cavity. Two sets of pistons 6 are arranged at the tail part of the piston rod 11 and distributed at two sides of the expansion sleeve 5, and are tightly pressed at the tail part of the piston rod 11 by large nuts 16, and the inner diameter and the outer diameter of each set of pistons 6 are dynamically sealed. An oil port 17 of the unlocking cavity is connected with the cylinder bottom 3, is directly communicated with an inner hole of the piston rod 11 through an oil guide pipe 7 and finally acts on the locking cavity through an oil hole of the expansion sleeve 5. The rod cavity oil port 19 is connected with the annular groove of the guide sleeve 9 and is communicated with the rod cavity in the oil cylinder, and the rodless cavity oil port 17 is communicated with the rodless cavity. The tight cover 5 that expands is installed in 11 afterbody of piston rod to both ends all are equipped with piston 6, make between two pistons 6, expand tight cover 5 external diameter and 8 inner walls of cylinder form locking and unblock chamber, expand tight cover 5 and 8 cooperation forms of cylinder be base hole system (H7/v 7) interference fit, 5 waist equipartitions of the tight cover that expands cross the oilhole outside 4mm of diameter, the oil hole department is all processed at the outer oil hole of crossing to the inside and outside footpath and has the annular oil groove of crossing of R3. Wherein, 4 is a small guide sleeve, 10 is a large baffle ring, 12 is a hole baffle ring, 13 is a shaft baffle ring, 14 is an outer baffle ring, and 15 is an inner baffle ring.
In fig. 4, a static seal 22 is arranged on a contact surface 21 of the oil guide pipe 7 and the cylinder bottom 3, and a dynamic seal is arranged at the tail part of the piston rod 11 to prevent leakage in an unlocking oil path. The contact surface of the oil guide pipe 7 and the oil plug 2 is provided with an unlocking cavity oil through groove.
In fig. 5 and 6, 4 outer oil through holes are uniformly distributed at the waist of the expansion sleeve 5, the diameter D1=4mm of the outer oil through hole, 4 inner oil through holes corresponding to the outer oil through holes are uniformly distributed on the piston rod 11, the diameter D2=4mm of the inner oil through hole, the diameter D1=10mm of the annular oil through groove at the outer oil through hole at the inner diameter of the expansion sleeve 5, the radius R =3mm of the annular oil through groove at the outer oil through hole at the outer diameter of the expansion sleeve 5, and the diameter D2= 10mm of the annular oil through groove at the inner oil through hole at the outer diameter of the piston rod 11.
Because the expansion sleeve 5 and the cylinder barrel 8 are in interference fit, the hydraulic oil cylinder is in a locking state before the oil supply of the unlocking cavity. When oil is supplied to the oil port 17 of the unlocking cavity, after the pressure of the unlocking cavity formed by the inner wall of the cylinder barrel 8 and the outer wall of the expansion sleeve 5 between the two pistons 6 reaches the elastic deformation value of the cylinder barrel 8, the cylinder barrel 8 is elastically deformed at the position of the unlocking cavity 20, the inner wall of the cylinder barrel 8 and the outer wall of the expansion sleeve 5 at the position of the unlocking cavity 20 are gradually separated, the friction force is reduced, the unlocking of the hydraulic oil cylinder is achieved, and the oil is supplied to the oil port 19 of the rod cavity or the oil port 18 of the rodless cavity at the moment, so that the telescopic function of the hydraulic oil cylinder is realized. When the unblock chamber 20 off-load, unblock chamber 20 pressure reduces to below the cylinder 8 elastic deformation value, and cylinder 8 resumes to initial condition, because the tight cover 5 external diameter that expands is greater than the cylinder 8 internal diameter, receives the influence of the tight cover 5 that expands, and cylinder 8 and the tight cover 5 that expands between frictional force lead to the tight cover 5 that expands can't realize the back-and-forth movement, no matter give the pole chamber hydraulic fluid port 19 or do not have pole chamber hydraulic fluid port 18 oil supply this moment, and hydraulic cylinder is locking.
Claims (9)
1. The utility model provides a full stroke locking hydraulic cylinder which characterized in that: an expansion sleeve (5) is sleeved outside a piston rod (11) in the cylinder barrel (8), the outer diameter of the expansion sleeve (5) is in interference fit with the inner wall of the cylinder barrel (8), an unlocking cavity oil port (17) is formed in the cylinder barrel (8), an unlocking cavity oil way for expanding the wall part of the cylinder barrel (8) in interference fit with the outer diameter of the expansion sleeve (5) through hydraulic oil is arranged in the cylinder barrel (8), and the position of an unlocking cavity (20) is arranged between the outer diameter of the expansion sleeve (5) and the inner wall part of the cylinder barrel (8) in interference fit with the outer diameter of the expansion sleeve (5); one port of the unlocking cavity oil way is communicated with the unlocking cavity oil port (17), and the other port of the unlocking cavity oil way corresponds to the unlocking cavity (20);
when the oil port (17) of the unlocking cavity is an oil inlet, the oil liquid flows to the position of the unlocking cavity (20) along the oil path of the unlocking cavity, the inner wall part of the cylinder barrel (8) in interference fit with the outer diameter of the expansion sleeve (5) elastically deforms and expands under the action of oil pressure, the outer diameter of the expansion sleeve (5) is in clearance fit with the inner wall of the cylinder barrel (8) to form the unlocking cavity (20), and the piston rod (11) is in an unlocking state;
when the oil port (17) of the unlocking cavity is an oil outlet, the unlocking cavity (20) is unloaded, the inner wall of the cylinder barrel (8) and the outer wall of the expansion sleeve (5) are restored to be in interference fit, and the piston rod (11) is in a locking state.
2. The full stroke locking hydraulic ram of claim 1, wherein: an oil guide pipe (7) is arranged on the cylinder bottom (3), an inner hole for the oil guide pipe (7) to move is formed in the tail end of the piston rod (11), and the oil guide pipe (7) extends into the inner hole; oil passing holes are formed in the expansion sleeve (5) and the piston rod (11), an unlocking cavity oil way is formed between inner holes of the oil guide pipe (7) and the piston rod (11), an unlocking cavity oil hole (17) is communicated with one end opening of the unlocking cavity oil way, and the other end opening of the unlocking cavity oil way corresponds to the position of the unlocking cavity (20) through the oil passing holes in the piston rod (11) and the expansion sleeve (5).
3. The full-stroke locking hydraulic cylinder of claim 2, wherein: the oil guide pipe (7) extends into the inner hole; be equipped with unblock chamber hydraulic fluid port (17) on cylinder (8), no pole chamber hydraulic fluid port (18) and have three hydraulic fluid port of pole chamber hydraulic fluid port (19), be equipped with tight cover (5) that expand in the middle of two pistons (6) that are located on piston rod (11), it has oil plug (2) to lead oil pipe (7) end, it crosses the oil groove to lead oil pipe (7) to be equipped with the unblock chamber on with oil plug (2) contact surface, still be equipped with the connection oil duct that leads to unblock chamber hydraulic fluid port (17) and unblock chamber to cross the oil groove on cylinder bottom (3), unblock chamber hydraulic fluid port (17) crosses the oil groove through the unblock chamber, connect oil duct and unblock chamber oil circuit a port intercommunication.
4. The full-stroke locking hydraulic cylinder of claim 3, wherein: the tail end gland (1) is connected to the bottom of the cylinder barrel (8) in a sealing mode.
5. The full-stroke locking hydraulic cylinder of claim 3, wherein: the two pistons (6) are arranged at the tail part of the piston rod (11), distributed at two sides of the expansion sleeve (5) and tightly pressed at the tail part of the piston rod (11) by large nuts (16), and the inner diameter and the outer diameter of each set of piston (6) are dynamically sealed.
6. A full-stroke locking hydraulic ram according to claim 2 or claim 3 wherein: a plurality of outer oil passing holes are uniformly distributed in the waist of the expansion sleeve (5), a plurality of inner oil passing holes corresponding to the outer oil passing holes are uniformly distributed in the piston rod (11), the inner diameter and the outer diameter of the expansion sleeve (5) are arranged at the outer oil passing holes, and annular oil passing grooves are formed in the positions, corresponding to the inner oil passing holes, of the outer diameter of the piston rod (11).
7. A full-stroke locking hydraulic ram according to claim 2 or claim 3 wherein: the contact surface (21) of the oil guide pipe (7) and the cylinder bottom (3) is provided with a static seal (22), and the tail part of the piston rod (11) is provided with a dynamic seal.
8. A full-stroke locking hydraulic ram according to claim 2 or claim 3 wherein: the inner hole of the piston rod (11) is larger than the outer diameter of the oil guide pipe (7) by more than 4mm, and the depth of the inner hole of the piston rod (11) is longer than the length of the oil guide pipe (7) by more than 20 mm.
9. The full-stroke locking hydraulic cylinder of claim 2, wherein: the cylinder bottom assembly is composed of a cylinder bottom (3), an oil plug (2) used for sealing the tail end of an oil guide pipe (7) and a tail end pressing cover (1), the cylinder bottom assembly is fixed at the bottom of a cylinder barrel (8) in a threaded connection mode, a step hole is formed in the cylinder bottom (3), the step hole comprises a large hole portion located at the tail portion and a small hole portion located at the front portion, the large step portion located at the tail portion of the oil guide pipe (7) is arranged in the large hole portion, the small hole portion penetrates through the thin portion in the middle of the oil guide pipe (7), and the thin portion at the front portion of the oil guide pipe (7) extends into an inner hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221947266.3U CN217783914U (en) | 2022-07-27 | 2022-07-27 | Full-stroke locking hydraulic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221947266.3U CN217783914U (en) | 2022-07-27 | 2022-07-27 | Full-stroke locking hydraulic oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217783914U true CN217783914U (en) | 2022-11-11 |
Family
ID=83941340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221947266.3U Active CN217783914U (en) | 2022-07-27 | 2022-07-27 | Full-stroke locking hydraulic oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217783914U (en) |
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2022
- 2022-07-27 CN CN202221947266.3U patent/CN217783914U/en active Active
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