CN217652987U

CN217652987U - Rotary hydraulic cylinder

Info

Publication number: CN217652987U
Application number: CN202123204506.9U
Authority: CN
Inventors: 余彦冬; 陈万勇; 顾丽莉; 王健伟; 汤旦丹; 秦榛
Original assignee: Jiangyin Hongteng Machinery Co ltd
Current assignee: Jiangyin Hongteng Machinery Co ltd
Priority date: 2021-12-19
Filing date: 2021-12-19
Publication date: 2022-10-25
Anticipated expiration: 2031-12-19

Abstract

The utility model relates to a pneumatic cylinder, especially a rotary hydraulic cylinder, include: the cylinder body, the rotating shaft, the piston ring and the end cover; the cylinder body is provided with a piston hole, a first oil hole and a second oil hole which are communicated with the piston hole, and one end of the piston hole is provided with a right-handed internal thread; an annular rotating groove is formed in the rotating shaft, left-handed external threads are arranged on one side of the rotating groove, and the rotating shaft is rotatably installed on the piston hole; the piston ring is movably inserted in the piston hole and the rotating shaft and is positioned between the first oil hole and the second oil hole, the piston ring is provided with a rotating sleeve, two sides of the rotating sleeve are respectively provided with a right-handed external thread and a left-handed internal thread, the rotating sleeve is movably inserted in the rotating groove, the right-handed external thread and the right-handed internal thread form a right-handed thread pair, and the left-handed internal thread and the left-handed external thread form a left-handed thread pair; the end cover is fixed on the rotating shaft and is rotatably arranged at the other end of the piston hole. The hydraulic cylinder has the advantages of high rotating speed and large rotating angle, and the rotating shaft does not need to extend out.

Description

Rotary hydraulic cylinder

Technical Field

The utility model relates to a pneumatic cylinder, especially a rotary hydraulic cylinder.

Background

The existing rotary hydraulic cylinder usually rotates when a piston rod extends out, and the existing rotary hydraulic cylinder has small rotation angle and slow rotation speed and cannot be applied to occasions without extending out the piston rod.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a only provide rotary motion to a rotary hydraulic cylinder that the rotation rate is fast, rotation angle is big, concrete technical scheme is:

a rotary fluid cylinder comprising: the cylinder body is provided with a piston hole, a first oil hole and a second oil hole which are communicated with the piston hole, and one end of the piston hole is provided with a right-handed internal thread; the rotary shaft is provided with an annular rotary groove, one side of the rotary groove is provided with a left-handed external thread, and the rotary shaft is rotatably arranged on the piston hole; the piston ring is movably inserted in the piston hole and the rotating shaft and is positioned between the first oil hole and the second oil hole, a rotating sleeve is arranged on the piston ring, right-handed external threads and left-handed internal threads are respectively arranged on two sides of the rotating sleeve, the rotating sleeve is movably inserted in the rotating groove, the right-handed external threads and the right-handed internal threads form a right-handed thread pair, and the left-handed internal threads and the left-handed external threads form a left-handed thread pair; and the end cover is fixed on the rotating shaft and is rotatably arranged at the other end of the piston hole.

Preferably, still include anticreep device, anticreep device includes anticreep ring, anticreep ring is fixed on the end cover, be equipped with the anticreep internal tooth on the anticreep ring, be equipped with the anticreep external tooth on the rotation axis, the anticreep external tooth with the meshing of anticreep internal tooth.

Preferably, the piston ring further comprises a pressure limiting valve, the pressure limiting valve is mounted in a pressure limiting hole of the rotating shaft, a third oil hole and a fourth oil hole which are communicated with the pressure limiting hole are further formed in the rotating shaft, and the piston ring is located between the third oil hole and the fourth oil hole.

Preferably, one end of the piston hole is provided with a limiting ring, and the right-handed internal thread is arranged on the limiting ring; and a rotating ring is arranged on the rotating shaft and is positioned on one side of the limiting ring.

Furthermore, the right-handed thread pair and the left-handed thread pair are both large-lead multi-start trapezoidal thread pairs.

Compared with the prior art the utility model discloses following beneficial effect has:

the utility model provides a pair of rotary hydraulic cylinder is through the vice quick rotation that realizes the rotation axis with right-hand thread pair of the left-hand thread pair of being connected with the piston to increased the pivoted angle, the rotation axis need not stretch out simultaneously, can the left-handed also can the dextrorotation.

Drawings

FIG. 1 is a cross-sectional view of a rotary fluid cylinder;

FIG. 2 is a cross-sectional view of the cylinder block;

FIG. 3 is a cross-sectional view of a piston ring;

fig. 4 is a sectional view of the rotary shaft.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 4, a rotary hydraulic cylinder includes: cylinder 2, rotation axis 1, piston ring 3, end cover 4 and anticreep device.

The two ends of the cylinder body 2 are provided with fixing rings 27, the cylinder body 2 is provided with a piston hole 20 and a first oil hole 21 and a second oil hole 22 which are communicated with the piston hole 20, one end of the piston hole 20 is provided with a limiting ring 25, and the limiting ring 25 is provided with a right-handed internal thread 26.

One end of the rotating shaft 1 is provided with a mounting hole 11 and a rotating ring 10, the rotating ring 10 is provided with an annular rotating groove 13, one side of the rotating groove 13 is provided with a left-handed external thread 12, the rotating shaft 1 is rotatably mounted on the piston hole 20, and the rotating ring 10 is positioned on one side of the limiting ring 25.

The piston ring 3 is movably inserted in the piston hole 20 and the rotating shaft 1 and is positioned between the first oil hole 21 and the second oil hole 22, the piston ring 3 is provided with a rotary sleeve 31, the outer circular surface of the rotary sleeve 31 is provided with a right-handed external thread 32, the inner circular surface of the rotary sleeve 31 is provided with a left-handed internal thread 33, the rotary sleeve 31 is movably inserted in the rotary groove 13, the right-handed external thread 32 and the right-handed internal thread 26 form a right-handed thread pair, and the left-handed internal thread 33 and the left-handed external thread 12 form a left-handed thread pair; the right-handed thread pair and the left-handed thread pair are both large-lead multi-start trapezoidal thread pairs.

The end cover 4 is connected with the other end of the rotating shaft 1 through threads and is rotatably arranged at the other end of the piston hole 20; the end cover 4 is provided with an end ring 41, the end ring 41 is rotatably located at the other end of the piston bore 20, and the end ring 41 and the rotating ring 10 define the axial position of the rotating shaft 1 to prevent the rotating shaft 1 from moving axially.

Anticreep device includes anticreep ring 5, and anticreep ring 5 passes through the fix with screw on end cover 4, is equipped with anticreep internal tooth 51 on the anticreep ring 5, is equipped with anticreep external tooth 17 on the rotation axis 1, and anticreep external tooth 17 meshes with anticreep internal tooth 51, and anticreep ring 5, rotation axis 1 and end cover 4 synchronous rotation prevent that the screw thread between end cover 4 and the rotation axis 1 from breaking back.

The rotating ring 10 is provided with a first sealing ring 81, the outer circumferential surface of the piston ring 3 is provided with a second sealing ring 82, the inner circumferential surface of the piston ring 3 is provided with a third sealing ring 83, the inner circumferential surface of the end cover 4 is provided with a fourth sealing ring 84, and the outer circumferential surface of the end cover 4 is provided with a fifth sealing ring 85.

The rotary hydraulic cylinder provided by the embodiment is a double-helix rotary hydraulic cylinder, and hydraulic oil is adopted to push the piston ring 3 to move left and right. The outer circle and the inner hole of the piston ring 3 are provided with large-lead multi-start trapezoidal threads which respectively form a right-handed screw pair with the cylinder body 2 and a left-handed screw pair with the output rotating shaft 1. When the piston ring 3 moves left and right, the piston ring rotates under the restriction of the right-handed screw pair of the cylinder body 2, meanwhile, the left-handed screw pair pushes the rotating shaft 1 to rotate, the rotating vectors of the piston ring 3 and the rotating shaft 1 are superposed, the rotating angle of the rotating shaft 1 is increased, and the rotating speed is high.

By changing the amount of hydraulic oil supplied to the rotary cylinder, the rotational speed of the rotary shaft 1 can be changed. By changing the pressure of the hydraulic oil, the output torque of the rotary shaft 1 can be changed. By changing the flow direction of the hydraulic oil, the rotation direction of the rotating shaft 1 can be changed.

The piston ring 3 divides the piston bore 20 into a first oil pressure chamber 23 and a second oil pressure chamber 24, the first oil pressure chamber 23 communicates with the first oil hole 21, and the second oil pressure chamber 24 communicates with the second oil hole 22. When the first oil hole 21 is communicated with the oil inlet of the hydraulic system, hydraulic oil enters the first oil pressure cavity 23 to push the piston ring 3 to move rightwards, and hydraulic oil in the second oil pressure cavity 24 is discharged out of the hydraulic cylinder through the second oil hole 22. Piston ring 3 moves the in-process to the right, receives the vice restraint of excircle right-handed screw selection, does clockwise rotation simultaneously, and the left-handed screw on the piston ring 3 is vice to promote rotation axis 1 and also to do clockwise rotation, and two clockwise turning vectors superpose, increase rotation axis 1's clockwise corner. On the contrary, when the second oil hole 22 is connected to the oil feed of the hydraulic system, the rotary shaft 1 rotates counterclockwise.

The cylinder body 2 is fixed on the frame of the equipment through a fixing ring 27, and four mounting holes 11 at the left end of the rotating shaft 1 are used for fixing on a rotating mechanism on the equipment. When the rotating shaft 1 of the rotary hydraulic cylinder rotates, the rotary structure on the equipment is driven to rotate.

Example two

On the basis of the first embodiment, the oil cylinder further comprises a pressure limiting valve 6, the pressure limiting valve 6 is installed in a pressure limiting hole 14 of the rotating shaft 1, a third oil hole 15 and a fourth oil hole 16 which are communicated with the pressure limiting hole 14 are further formed in the rotating shaft 1, the piston ring 3 is located between the third oil hole 15 and the fourth oil hole 16, the third oil hole 15 is communicated with the first oil pressure cavity 23, and the fourth oil hole 16 is communicated with the second oil pressure cavity 24. The oil outlet of the pressure limiting valve 6 is connected with a first oil pressure cavity 23 and a second oil pressure cavity 24 of the hydraulic cylinder. When the rotating shaft 1 drives the load to rotate, if the load is too large, and the pressure of the first oil pressure cavity 23 of the hydraulic cylinder reaches the set pressure of the pressure limiting valve 6, the pressure limiting valve 6 is automatically opened, and the first oil pressure cavity 23 and the second oil pressure cavity 24 are communicated through the third oil hole 15, the pressure limiting hole 14 and the fourth oil hole 16, so that the effects of pressure limiting and load limiting are achieved, and the hydraulic cylinder is effectively protected.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the claims of the present invention.

Claims

1. A rotary fluid cylinder, comprising:

the cylinder body (2) is provided with a piston hole (20) and a first oil hole (21) and a second oil hole (22) which are communicated with the piston hole (20), and one end of the piston hole (20) is provided with a right-handed internal thread (26);

the piston type hydraulic cylinder is characterized by comprising a rotating shaft (1), wherein an annular rotating groove (13) is formed in the rotating shaft (1), a left-handed external thread (12) is arranged on one side of the rotating groove (13), and the rotating shaft (1) is rotatably arranged on a piston hole (20);

the piston ring (3) is movably inserted into the piston hole (20) and the rotating shaft (1) and is positioned between the first oil hole (21) and the second oil hole (22), a rotary sleeve (31) is arranged on the piston ring (3), right-handed external threads (32) and left-handed internal threads (33) are respectively arranged on two sides of the rotary sleeve (31), the rotary sleeve (31) is movably inserted into the rotary groove (13), the right-handed external threads (32) and the right-handed internal threads (26) form a right-handed thread pair, and the left-handed internal threads (33) and the left-handed external threads (12) form a left-handed thread pair; and

and the end cover (4) is fixed on the rotating shaft (1), and is rotatably arranged at the other end of the piston hole (20).

2. The rotary hydraulic cylinder according to claim 1, further comprising an anti-disengagement device, wherein the anti-disengagement device comprises an anti-disengagement ring (5), the anti-disengagement ring (5) is fixed on the end cover (4), anti-disengagement internal teeth (51) are arranged on the anti-disengagement ring (5), anti-disengagement external teeth (17) are arranged on the rotating shaft (1), and the anti-disengagement external teeth (17) are engaged with the anti-disengagement internal teeth (51).

3. A rotary hydraulic cylinder according to claim 1, further comprising a pressure limiting valve (6), wherein the pressure limiting valve (6) is installed in a pressure limiting hole (14) of the rotary shaft (1), a third oil hole (15) and a fourth oil hole (16) communicated with the pressure limiting hole (14) are further formed in the rotary shaft (1), and the piston ring (3) is located between the third oil hole (15) and the fourth oil hole (16).

4. A rotary hydraulic cylinder according to claim 1, characterized in that one end of the piston bore (20) is provided with a stop collar (25), the right-hand internal thread (26) being provided on the stop collar (25); and a rotating ring (10) is arranged on the rotating shaft (1), and the rotating ring (10) is positioned on one side of the limiting ring (25).

5. A rotary fluid-operated cylinder as claimed in any one of claims 1 to 4, wherein the right-hand thread pair and the left-hand thread pair are each a large-lead multiple-start acme thread pair.