CN211202495U - Multi-sealing steel ball lock hydraulic cylinder - Google Patents

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a multi-sealing steel ball lock hydraulic cylinder, the locking force of the existing hydraulic cylinder is not enough and the sealing effect is not good, therefore, the scheme provides a multi-sealing steel ball lock hydraulic cylinder, which comprises a lower end cover, a piston rod, a cylinder barrel, an upper end cover and an earring, a first oil port close to the lower end cover and a second oil port close to the upper end cover are arranged on the cylinder barrel, a spring and a piston are arranged at the part close to the end cover in the cylinder barrel, a uniform distribution hole and an end face annular groove are arranged at the end part of the piston rod, an arc surface groove matched with the uniform distribution hole is arranged on the inner wall of the cylinder barrel, steel balls are arranged between the uniform distribution hole and the arc surface groove, a plurality of grating rings are arranged between the cylinder barrel and the piston, a retaining ring is arranged in the cylinder barrel, the hydraulic oil cylinder solves the problems and has a good development prospect in the technical field of hydraulic oil cylinders.

Description

Multi-sealing steel ball lock hydraulic cylinder

Technical Field

The utility model relates to a hydraulic cylinder technical field especially relates to a multiple sealed steel ball lock pneumatic cylinder.

Background

The hydraulic cylinder is one of the commonly used executing elements in the hydraulic industry, and a piston rod of the hydraulic cylinder is required to stay at a certain fixed position for a long time in many occasions, namely, the hydraulic cylinder has no displacement under the action of external load.

The traditional method is to design a locking loop, generally a three-position four-way reversing valve, a one-way valve, a hydraulic control one-way valve, a two-way hydraulic lock and the like form a corresponding loop to achieve the purpose of one-way or two-way locking, but the locking mode of a hydraulic cylinder and a hydraulic valve inevitably has leakage, so that the piston rod cannot be guaranteed to stay at a certain fixed position for a long time, and the leakage is more serious particularly under the condition of heavy load, so that the traditional hydraulic cylinder and hydraulic valve locking technology cannot meet the use requirement on occasions with higher requirements on the heavy load and the locking position.

The existing locking hydraulic cylinder is divided into two forms of stroke two-end locking and required stroke section locking according to locking positions, common locking modes comprise an outer inserted pin bead, an outer pressing sleeve, a screw rod piston rod, conical surface friction pressing and the like, and the locking modes of the outer inserted pin bead and the outer pressing sleeve are manual locking and are not suitable for modern operation; the locking mode of the piston rod of the screw rod is automatic operation, but the additional system is complex, the mechanism is huge, and the cost is complex; the conical surface friction pressing locking mechanism is simple, but the conical surface pressing reverse thrust is limited, and the requirement of heavy load work cannot be met.

And if the hydraulic cylinder is used on a ship, water pollution can be caused due to oil leakage of the hydraulic cylinder, so that the locking hydraulic cylinder with good sealing property is required to be provided so as to meet the requirement of long-time and high-precision locking and positioning of the hydraulic cylinder and avoid the problem of oil leakage caused by leakage inside the hydraulic cylinder.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned condition, for overcoming prior art's defect, the utility model provides a multiple sealed steel ball lock pneumatic cylinder solves current pneumatic cylinder locking dynamics and reaches the not good problem of sealed effect inadequately.

Its technical scheme is, a multiple sealed steel ball lock pneumatic cylinder, including lower end cover, piston rod, cylinder, upper end cover and earrings, set up the first hydraulic fluid port that is close to the lower end cover on the cylinder and be close to the second hydraulic fluid port of upper end cover, the earrings pass through lock nut and piston rod thread tightening, the one end that is close to the lower end cover in the cylinder sets up down spring and gliding piston, the spring is located between gliding piston and the lower end cover down, the one end that is close to the upper end cover in the cylinder sets up spring and last piston, the spring is located between last piston and the upper end cover, the tailpiece of the piston rod portion is provided with equipartition hole and the terminal surface annular that is used for placing the steel ball, it has a plurality ofly and is annular evenly distributed in piston rod circumference surface to equipartition hole, the cylinder inner wall be provided with equipartition hole complex first arc surface slot and second arc surface slot, the arc surface slot on first arc surface slot and the second arc surface slot and the ball bearing is characterized in that the ball bearing is arranged between the uniformly distributed holes and the arc surface grooves, the ball bearing is arranged in the uniformly distributed holes and is clamped with the arc surface grooves to realize locking, 2 grating rings are arranged between the cylinder barrel and the upper sliding piston, between the cylinder barrel and the lower sliding piston and between the piston rod and the cylinder barrel and are used for sealing, the two grating rings are a group, and guide belts are arranged on two sides of each group of grating ring and used for guiding the pistons respectively.

Furthermore, sealing rings are arranged between the lower end cover and the cylinder barrel and between the upper end cover and the cylinder barrel to prevent hydraulic oil from leaking, a dustproof ring is arranged between the piston rod and the upper end cover to prevent impurities such as dust from entering the oil cylinder along with the piston rod, and a guide belt is arranged on one side of the dustproof ring close to the piston and used for guiding the piston rod.

Furthermore, the piston rod is in a step shape, the uniformly distributed holes comprise a first uniformly distributed hole and a second uniformly distributed hole which are distributed on the piston rod at the larger diameter end, the first uniformly distributed hole is close to the end where the lower sliding piston is located, the second uniformly distributed hole is close to the end where the upper sliding piston is located, the first uniformly distributed hole and the second uniformly distributed hole are both formed by a plurality of uniformly distributed holes which are uniformly distributed on the peripheral surface of the piston rod, the steel ball comprises a first steel ball group and a second steel ball group, the first steel ball group is distributed in the first uniformly distributed hole, the second steel ball group is distributed in the second uniformly distributed hole, and when the piston rod is in the minimum stroke, the first steel ball group enters the first arc surface groove under the pushing of the lower sliding piston to realize locking; when the piston rod is in the maximum stroke, the second steel ball group enters the second arc surface groove under the pushing of the upper sliding piston, and locking is achieved.

Furthermore, a first retaining ring and a second retaining ring are arranged between the cylinder barrel and the lower sliding piston, a third retaining ring and a fourth retaining ring are arranged between the cylinder barrel and the upper sliding piston, the first retaining ring and the second retaining ring are distributed on two sides of the first oil port, and the third retaining ring and the fourth retaining ring are distributed on two sides of the second oil port.

Furthermore, a first annular groove matched with the first retainer ring and a second annular groove matched with the second retainer ring are respectively arranged on two sides of the first oil port, a third annular groove matched with the third retainer ring and a fourth annular groove matched with the fourth retainer ring are respectively arranged on two sides of the second oil port, the grooves are matched with the retainer rings one by one for use, the first retainer ring is used for positioning the downward sliding piston, the fourth retainer ring is used for positioning the upward sliding piston, and the second retainer ring and the third retainer ring are used for limiting the maximum stroke and the minimum stroke of the piston rod.

Furthermore, the first arc surface groove is located at one end, far away from the lower spring, of the lower sliding piston, the second arc surface groove is located at one end, far away from the upper spring, of the upper sliding piston, one end, close to the corresponding arc surface groove, of each piston is an internal cylindrical external cone and is a revolution surface with a chamfer and a fillet, the chamfer and the fillet are located at the end part of the external cone, a smooth inclined plane for the steel ball to enter the arc surface groove is formed, and the steel ball can smoothly enter the corresponding arc surface groove under the pushing of the piston to achieve locking.

Furthermore, threads are processed at two ends of the cylinder barrel, and the end covers are connected with the cylinder barrel through the threads.

Furthermore, the piston rod is an integrated structure formed by the piston rod and the piston.

When the piston rod is in the minimum stroke, the lower sliding piston tightly pushes the first check ring under the action of the lower spring, the first steel ball group is pushed by the lower sliding piston to enter the first arc surface groove along the inner cylinder, and the outer cone and the revolution surface with the chamfer angle and the fillet enter the first arc surface groove, so that the locking of the steel ball lock hydraulic cylinder in the minimum stroke is realized; when the piston rod needs to extend outwards, hydraulic oil is introduced from the first oil port, the hydraulic oil acts on the lower sliding piston, when acting force generated by the hydraulic oil is enough to overcome the spring force of the lower spring and can further compress the lower spring, the lower piston moves towards the direction of the lower spring under the acting force of the hydraulic oil, when the lower spring is compressed to a certain degree, namely the lower sliding piston moves to a certain position, the first steel ball group slides from the first arc surface groove and is pressed into the first uniform distribution hole of the piston rod, the piston rod extends outwards under the acting force of the hydraulic oil until extending to the maximum stroke position, and at the moment, the second steel ball group enters the second arc surface groove along the outer cone of the revolution surface under the pushing of the upper sliding piston, so that the hydraulic cylinder of the steel ball lock is quickly locked at the maximum stroke; when the piston rod needs to contract inwards, hydraulic oil is introduced from the second oil port, the hydraulic oil acts on the upper sliding piston, acting force generated by the hydraulic oil is enough to overcome spring force of the upper spring and can further compress the upper spring, the upper piston moves towards the upper spring under the acting force of the hydraulic oil, when the upper spring is compressed to a certain degree, namely the upper sliding piston moves to a certain position, the second steel ball group slides the second arc surface groove and is pressed into the second uniform distribution hole in the piston rod, the piston rod contracts inwards under the acting force of the hydraulic oil until the piston rod contracts to the minimum stroke position, at the moment, the first steel ball group pushes the lower sliding piston to move along the inner cylinder, the outer cone enters the first arc surface groove along the rotating surface with the chamfer angle and the fillet, and the steel ball lock hydraulic cylinder is quickly locked at the minimum stroke, when the check ring moves on the piston rod, the check ring is arranged between the cylinder barrel and the upper, The sealing effect is achieved between the cylinder barrel and the lower sliding piston and between the piston rod and the cylinder barrel, and oil leakage is avoided.

The technical effect of the utility model is, through set up two sets of equal cloth holes and set up the steel ball on the piston rod, respectively with the cooperation of the first arc surface slot of gliding piston department and the second arc surface slot of last sliding piston department, under the prerequisite that lets in hydraulic oil, utilize the piston under the effect of spring, shift the steel ball position, realize the locking of piston rod in maximum stroke position and minimum stroke position department, and guarantee the leakproofness of pneumatic cylinder through setting up a plurality of check rings, prevent that fluid from leaking, the guidance tape is used for the piston direction, moreover, the steam generator is compact in structure, safety and reliability, save installation space, lighten the whole weight of pneumatic cylinder.

Drawings

Fig. 1 is a schematic structural view of the steel ball lock hydraulic cylinder of the present invention at the minimum stroke position.

Fig. 2 is a schematic structural view of the steel ball lock hydraulic cylinder of the present invention at the maximum stroke position.

Fig. 3 is a schematic view of the piston rod structure of the steel ball lock hydraulic cylinder of the present invention.

Fig. 4 is the schematic view of the cylinder structure of the steel ball lock hydraulic cylinder of the present invention.

1. A lower end cover; 2. a lower spring; 3. a lower slide piston; 41. a first retainer ring; 42. a second retainer ring; 43. a third retainer ring; 44. a fourth retainer ring; 51. a first oil port; 52. a second oil port; 61. a first steel ball group; 62. a first steel ball group; 7. a piston rod; 71. a first uniform distribution hole; 72. a second uniform distribution hole; 8. a cylinder barrel; 81. a first arc surface groove; 82. a second arc surface groove; 83. a first annular groove; 84. a second annular groove; 85. a third annular groove; 86. a fourth annular groove; 9. an upper slide piston; 10. an upper spring; 11. an upper end cover; 12. locking the nut; 13. an ear ring; 14. a guide belt; 15. a Gray circle; 16. a dust ring; 17. and (5) sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1 to 4, the multiple-seal steel ball lock hydraulic cylinder comprises a lower end cover 1, a piston rod 7, a cylinder barrel 8, an upper end cover 11 and an ear ring 13, wherein a first oil port 51 close to the lower end cover 1 and a second oil port 52 close to the upper end cover 11 are arranged on the cylinder barrel 8, the ear ring 13 is fixed with the piston rod 7 through a locking nut 12 in a threaded manner, a lower spring 2 and a lower sliding piston 3 are arranged at one end, close to the lower end cover 1, in the cylinder barrel 8, the lower spring 2 is arranged between the lower end cover 1 and the lower sliding piston 3, an upper spring 10 and an upper sliding piston 9 are arranged at one end, close to the upper end cover 11, in the cylinder barrel 8, the upper spring 10 is arranged between the upper sliding piston 9 and the upper end cover 11, uniform distribution holes for placing steel balls are arranged at the end of the piston rod 7, the uniform distribution holes are annularly and uniformly distributed on the circumferential surface of the piston rod 7, a first arc surface groove 81 and a second arc surface, the arc surface grooves on the first arc surface groove 81 and the second arc surface groove 82 are matched with uniformly distributed holes on the piston rod 7, steel balls are placed between the uniformly distributed holes and the arc surface grooves, the steel balls are placed in the uniformly distributed holes and clamped with the arc surface grooves to realize locking, the first arc surface groove 81 is positioned at one end, far away from the lower spring 2, of the lower sliding piston 3, the second arc surface groove 82 is positioned at one end, far away from the upper spring 10, of the upper sliding piston 3, one end, close to the arc surface grooves, of each piston is an internal cylindrical external cone and is arranged on a chamfer angle and a fillet revolution surface, so that the steel balls can smoothly enter the corresponding arc surface grooves to realize locking under the pushing of the pistons, 2 grid rings 15 are arranged between the cylinder barrel 8 and the upper sliding piston 9, between the cylinder barrel 8 and the lower sliding piston 3, between the piston rod 7 and the cylinder barrel 8 and used for sealing, and the two grid rings are in a group, guide belts 14 are arranged on two sides of each group of the check rings and used for guiding a piston, sealing rings 17 are arranged between the lower end cover and the cylinder barrel and between the upper end cover and the cylinder barrel to prevent hydraulic oil from leaking, a dustproof ring 16 is arranged between the piston rod and the upper end cover to prevent impurities such as dust from entering the oil cylinder along with the piston rod, the guide belts 14 are arranged on one side of the dustproof ring close to the piston and used for guiding the piston rod 7, threads are machined at two ends of the cylinder barrel 8, and the end covers are connected with the cylinder barrel through the threads.

Example two: on the basis of the first embodiment, the piston rod is stepped, the uniformly distributed holes include a first uniformly distributed hole 71 and a second uniformly distributed hole 72 which are distributed on the piston rod at the larger diameter end, the first uniformly distributed hole 71 is close to the end where the lower sliding piston 3 is located, the second uniformly distributed hole 72 is close to the end where the upper sliding piston 9 is located, the first uniformly distributed hole 71 and the second uniformly distributed hole 72 are both formed by a plurality of uniformly distributed holes which are uniformly distributed on the outer peripheral surface of the piston rod, the steel balls include a first steel ball group 61 and a second steel ball group 62, the first steel ball group 61 is distributed in the first uniformly distributed hole 71, the second steel ball group 62 is distributed in the second uniformly distributed hole 72, and when the piston rod 7 is at the minimum stroke, the first steel ball group 61 enters the first arc surface groove 81 under the pushing of the lower sliding piston to realize locking; when the piston rod is in the maximum stroke, the second steel ball group 62 enters the second arc surface groove 82 under the pushing of the upper sliding piston to realize locking, a first retainer ring 41 and a second retainer ring 42 are arranged between the cylinder barrel 8 and the lower sliding piston 3, a third retainer ring 43 and a fourth retainer ring 44 are arranged between the cylinder barrel 8 and the upper sliding piston 9, the first retainer ring 41 and the second retainer ring 42 are distributed at two sides of the first oil port 51, the third retainer ring 43 and the fourth retainer ring 44 are distributed at two sides of the second oil port 52, a first annular groove 83 matched with the first retainer ring 41 and a second annular groove 84 matched with the second retainer ring 42 are respectively arranged at two sides of the first oil port 51, a third annular groove 85 matched with the third retainer ring 43 and a fourth annular groove 86 matched with the fourth retainer ring 44 are respectively arranged at two sides of the second oil port 52, each groove is used in one-to-one matching with the retainer rings, and the first retainer ring 41 is used for positioning the lower sliding piston, a fourth retainer ring 44 is used for positioning the upper sliding piston, and both the second retainer ring 42 and the third retainer ring are used for positioning the piston rod.

When the piston rod 7 is in the minimum stroke, the lower sliding piston 3 tightly pushes the first check ring 41 under the action of the lower spring 2, the first steel ball group 61 enters the first arc surface groove 81 along the inner cylinder and the outer cone and the revolving surface with the chamfer angle and the fillet under the pushing action of the lower sliding piston 3, and the locking of the steel ball lock hydraulic cylinder in the minimum stroke is realized; when the piston rod 7 needs to extend outwards, hydraulic oil is introduced from the first oil port 51, acts on the lower sliding piston 3, when the force generated by the hydraulic oil is sufficient to overcome the spring force of the lower spring 2 and can further compress the lower spring 2, the lower piston 3 moves in the direction of the lower spring 2 under the force of the hydraulic oil, and when the lower spring 2 is compressed to a certain extent, namely, when the lower sliding piston 3 moves to a certain position, the first steel ball group 61 slides from the first arc surface groove 81 and is pressed into the first uniform distribution hole 71 of the piston rod 7, the piston rod 7 extends outwards under the action of hydraulic oil until the piston rod extends to the maximum stroke position, at the moment, the second steel ball group 62 enters the second arc surface groove 82 along the inner cylinder and the outer cone and the revolution surface with the chamfer angle and the fillet under the pushing action of the upper sliding piston 9, so that the hydraulic cylinder of the steel ball lock is quickly locked at the maximum stroke; when the piston rod 7 needs to be retracted inward, hydraulic oil is supplied from the second oil port 52, the hydraulic oil acts on the upper slide piston 9, when the force generated by the hydraulic oil is sufficient to overcome the spring force of the upper spring 10 and is able to further compress the upper spring 10, the upper piston 9 is displaced in the direction of the upper spring 10 under the force of the hydraulic oil, and when the upper spring 10 is compressed to a certain extent, namely, when the upper sliding piston 9 moves to a certain position, the second steel ball group 62 slides the second arc surface groove 82 and is pressed into the second uniform distribution hole 72 on the piston rod 7, the piston rod 7 contracts inwards under the action of hydraulic oil until the piston rod contracts to the position of the minimum stroke, at the moment, the first steel ball group 61 enters the first arc surface groove 81 along the inner cylinder under the pushing of the downward sliding piston 3 and the outer cone and the revolution surface with the chamfer angle and the fillet, so that the steel ball lock hydraulic cylinder is locked quickly at the minimum stroke.

The technical effect of the utility model is, through set up two sets of equal cloth holes and set up the steel ball on the piston rod, respectively with the cooperation of the first arc surface slot of gliding piston department and the second arc surface slot of last sliding piston department, under the prerequisite that lets in hydraulic oil, utilize the piston under the effect of spring, shift the steel ball position, realize the locking of piston rod in maximum stroke position and minimum stroke position department, and guarantee the leakproofness of pneumatic cylinder through setting up a plurality of check rings, prevent that fluid from leaking, the guidance tape is used for the piston direction, moreover, the steam generator is compact in structure, safety and reliability, save installation space, lighten the whole weight of pneumatic cylinder.

The present invention has been described in detail with reference to the specific embodiments and examples, but these should not be construed as limitations of the present invention. Numerous variations and modifications can be made by those skilled in the art without departing from the principles of the invention, which should also be considered as within the scope of the invention.

Claims (7)

1. A multi-seal steel ball lock hydraulic cylinder comprises a lower end cover (1), a piston rod (7), a cylinder barrel (8), an upper end cover (11) and an ear ring (13), wherein a first oil port (51) close to the lower end cover (1) and a second oil port (52) close to the upper end cover (11) are arranged on the cylinder barrel (8), the ear ring (13) is fixed with the piston rod (7) through a lock nut (12), the multi-seal steel ball lock hydraulic cylinder is characterized in that a lower spring (2) and a lower sliding piston (3) are arranged at one end, close to the lower end cover (1), in the cylinder barrel (8), an upper spring (10) and an upper sliding piston (9) are arranged at one end, close to the upper end cover (11), an uniform distribution hole and an end face annular groove are arranged at the end part of the piston rod (7), a first arc face groove (81) and a second arc face groove (82) which are matched with the uniform distribution hole are arranged on, steel balls are placed between the uniform distribution holes and the arc surface grooves, a grating ring (15) is arranged between the cylinder barrel (8) and the piston, a grating ring (15) is arranged between the piston rod and the cylinder barrel, and guide belts (14) are arranged on two sides of each grating ring.

2. The multi-seal steel ball lock hydraulic cylinder as claimed in claim 1, wherein a seal ring (17) is arranged between the end cover and the cylinder barrel, a dust ring (16) is arranged between the piston rod and the upper end cover, and a guide belt (14) is arranged on one side of the dust ring close to the piston.

3. A multiple seal, ball lock cylinder as defined in claim 2 in which the first arcuate groove (81) is located at the end of the lower slide piston (3) remote from the lower spring (2), the second arcuate groove (82) is located at the end of the upper slide piston (9) remote from the upper spring (10), and the end of each piston adjacent to the arcuate groove is an inner cylindrical outer cone and presents a chamfer and fillet surface of revolution.

4. A multi-seal steel ball lock cylinder as defined in claim 1 in which said piston rod is stepped, said equispaced holes include a first (71) and a second (72) equispaced holes distributed on the larger diameter end piston rod, and said steel balls include a first (61) and a second (62) set of steel balls.

5. The multi-seal steel ball lock hydraulic cylinder according to claim 1, wherein a first retainer ring (41) and a second retainer ring (42) are arranged between the cylinder barrel (8) and the lower sliding piston (3), a third retainer ring (43) and a fourth retainer ring (44) are arranged between the cylinder barrel (8) and the upper sliding piston (9), the first retainer ring (41) and the second retainer ring (42) are distributed on two sides of the first oil port (51), and the third retainer ring (43) and the fourth retainer ring (44) are distributed on two sides of the second oil port (52).

6. The multi-seal steel ball lock hydraulic cylinder as claimed in claim 5, wherein a first annular groove (83) and a second annular groove (84) are respectively arranged on two sides of the first oil port (51), a third annular groove (85) and a fourth annular groove (86) are respectively arranged on two sides of the second oil port (52), and each groove is matched with a retainer ring.

7. The multi-seal steel ball lock hydraulic cylinder as claimed in claim 1, wherein threads are machined at both ends of the cylinder barrel (8), and each end cover is connected with the cylinder barrel through the threads.

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