CN101761716A

CN101761716A - Seal swivel joint

Info

Publication number: CN101761716A
Application number: CN 201010121455
Authority: CN
Inventors: 宋国裕; 殷嘉寿; 潘志荣
Original assignee: Wuxi changjiang hydraulic cylinder factory
Current assignee: Wuxi changjiang hydraulic cylinder factory
Priority date: 2010-03-10
Filing date: 2010-03-10
Publication date: 2010-06-30

Abstract

The invention relates to a seal swivel joint. The joint comprises a swivel spindle and a joint body, wherein the swivel spindle is arranged in the joint body; a first deep groove ball bearing and a second deep groove ball bearing are sleeved on the swivel spindle; an inner ring of the first deep groove ball bearing and an inner ring of the second deep groove ball bearing are connected with the swivel spindle, and make swiveling motion with the swivel spindle; an outer ring of the first deep groove ball bearing, an outer ring of the second deep groove ball bearing and an inner hole of the joint body are connected and fixed through an interference fit; a certain clearance is reserved between the swivel spindle and the joint body; a first oil port and a second oil port are arranged on the joint body; the swivel spindle is provided with a first oil channel and a second oil channel; the first oil port is communicated to a cavity with a rod of a hydraulic cylinder through the first oil channel, while the second oil port is communicated to a cavity without a rod of the hydraulic cylinder through the second oil channel. The seal swivel joint has smart and reasonable structure and good operation effect, can effectively reduce leakage of working medium caused by broken sealing element, and avoids abrasion caused by direct contact between the swivel spindle and the joint body.

Description

Seal swivel joint

Technical field

The present invention relates to a kind of hydraulic connectors, specifically is a kind of seal swivel joint that is used on the oil hydraulic cylinder.

Background technique

In the prior art, the seal swivel joint that is used on the oil hydraulic cylinder mainly is made up of rotation mandrel, fittings body and Sealing etc.After operation a period of time, Sealing is easy to wearing and tearing, behind the sealing part abrasion, can cause the leakage of working medium when rotated, and when rapid circular movement, it is comparatively serious to generate heat owing to rubbing between rotation mandrel and the fittings body, occurs " locking " phenomenon easily, thereby only is applicable to the occasion of low speed rotation.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, the seal swivel joint that a kind of structure is ingenious rationally, operational effect is good is provided, the sealing swivel joint can effectively reduce the leakage that damages the working medium that causes because of Sealing, avoid rotating and directly contact between mandrel and the fittings body and wear and tear, can satisfy the job requirement of high speed rotating.

According to technological scheme provided by the invention, described seal swivel joint comprises rotation mandrel and fittings body, the rotation mandrel is assemblied in the fittings body, it is characterized in that, suit first deep groove ball bearing, second deep groove ball bearing on the rotation mandrel, the inner ring of first deep groove ball bearing, second deep groove ball bearing is connected with the rotation mandrel, rotates with the rotation mandrel; The outer ring of first deep groove ball bearing, second deep groove ball bearing and the endoporus of fittings body are connected and fixed by interference fit; There is certain interval between rotation mandrel and the fittings body; Offer first hydraulic fluid port and second hydraulic fluid port on the fittings body, rotation offers first oil duct and second oil duct on the mandrel, and first hydraulic fluid port is communicated to the rod chamber of oil hydraulic cylinder by first oil duct, and second hydraulic fluid port is communicated to the rodless cavity of oil hydraulic cylinder by second oil duct.

As a further improvement on the present invention, offer the leakage hydraulic fluid port on the described end cap, offer the leakage oil duct on the described rotation mandrel, reveal hydraulic fluid port and be connected with the leakage oil duct.

As a further improvement on the present invention, the end that first deep groove ball bearing is housed of described fittings body is equipped with rotating seal ring by saturating lid sealing between the saturating lid and first deep groove ball bearing; The end that second deep groove ball bearing is housed of fittings body is equipped with seal ring by end bracket enclosed between end cap and the fittings body.

As a further improvement on the present invention, described rotating seal ring is made up of clamping section, sealed lip and extension spring, and clamping section and sealed lip are combined closely, and extension spring is sleeved on the sealed lip.

As a further improvement on the present invention, described clamping section adopts canvas filler rubber to make; Described sealed lip adopts rubber to make.

The present invention compared with prior art, advantage is: (1), rotation mandrel and fittings body have the gap, can avoid rotating directly contacting between mandrel and the fittings body and wearing and tearing, and influence flexibility of revolution; (2), hydraulic oil circulates between rotation mandrel and fittings body, can improve counterrotating flexibility, has cooling action again, can reduce frictional heating, guarantees the swivel joint continuous operation; (3), extension spring is arranged in the rotating seal ring, increase the radial compaction power of sealed lip, can prevent the external leakage of working medium, guarantee swivel joint fast rotational under High Temperature High Pressure the rotation mandrel; (4), simple and reasonable for structure, compact, be easy to safeguard that life cycle is long.

Description of drawings

Fig. 1 is a structural front view of the present invention.

Fig. 2 is the A portion enlarged diagram among Fig. 1.

Description of reference numerals: 1-rotation mandrel, 2-rotating seal ring, 2a-clamping section, 2b-sealed lip, 2c-extension spring, 3-first deep groove ball bearing, 4-first hydraulic fluid port, 5-second hydraulic fluid port, 6-fittings body, 7-second deep groove ball bearing, 8-leakage hydraulic fluid port, 9-end cap, 10-first oil duct, 11-second oil duct, 12-reveal oil duct, 13-covers thoroughly.

Embodiment

The invention will be further described below in conjunction with concrete drawings and Examples.

As shown in Figure 1, the present invention mainly by rotation mandrel 1, rotating seal ring 2, first deep groove ball bearing 3, fittings body 6, second deep groove ball bearing 7, end cap 9, cover component such as 13 thoroughly and form.

As shown in Figure 1, be assemblied in the fittings body 6 on the rotation mandrel 1, the inner ring of suit first deep groove ball bearing 3, second deep groove ball bearing, 7, the first deep groove ball bearings 3, second deep groove ball bearing 7 is connected with rotation mandrel 1 on the rotation mandrel 1, rotates with rotation mandrel 1; The outer ring of first deep groove ball bearing 3, second deep groove ball bearing 7 and the endoporus of fittings body 6 are connected and fixed by interference fit, and fittings body 6 keeps transfixion; There is certain interval between rotation mandrel 1 and the fittings body 6, to guarantee that working medium circulates in the gap; Offer first hydraulic fluid port 4 and second hydraulic fluid port 5 on the fittings body 6, offer first oil duct 10 and second oil duct 11 on the described rotation mandrel 1, first hydraulic fluid port 4 is communicated to the rod chamber of oil hydraulic cylinder by first oil duct 10, and second hydraulic fluid port 5 is communicated to the rodless cavity of oil hydraulic cylinder by second oil duct 11.

As shown in Figure 1, the end that first deep groove ball bearing 3 is housed of described fittings body 6 covers thoroughly between 13 and first deep groove ball bearing 3 rotating seal ring 2 is housed by saturating lid 13 sealings; The end that second deep groove ball bearing 7 is housed of fittings body 6 is equipped with seal ring by end cap 9 sealings between end cap 9 and the fittings body 6; Offer on the end cap 9 and reveal hydraulic fluid port 8, offer on the rotation mandrel 1 and reveal oil duct 12, revealing hydraulic fluid port 8 is connected with leakage oil duct 12, swivel joint is when work, working medium between the slit of rotation mandrel 1 and fittings body 6 can release via revealing hydraulic fluid port 9, the heat that releases generation in the time of can taking away swivel joint work of working medium.

As shown in Figure 2, described rotating seal ring 2 is made up of clamping section 2a, sealed lip 2b and extension spring 2c; Clamping section 2a adopts canvas filler rubber to make, and is very durable; Sealed lip 2b adopts rubber to make, itself and clamping section 2a are closely linked, and extension spring 2c is sleeved on the sealed lip 2b, are used to increase the radial compaction power of sealed lip 2b to rotation mandrel 1, prevented the external leakage of hydraulic oil, swivel joint can be run up.

During swivel joint work, 4 oil-feeds of first hydraulic fluid port or 5 oil-feeds of second hydraulic fluid port, hydraulic oil flows in the gap between rotation mandrel 1 and fittings body 6, form one deck oil film, the rotation mandrel 1 and first deep groove ball bearing 3, when second deep groove ball bearing 7 is made high speed rotary motion with equipment work-piece, hydraulic oil has played effect lubricated and cooling, avoids rotating the friction damage that directly contacts generation between mandrel 1 and the fittings body 6, has guaranteed the long-term use of swivel joint.

Claims

1. seal swivel joint, comprise rotation mandrel (1) and fittings body (6), rotation mandrel (1) is assemblied in the fittings body (6), it is characterized in that, rotation mandrel (1) is gone up suit first deep groove ball bearing (3), second deep groove ball bearing (7), the inner ring of first deep groove ball bearing (3), second deep groove ball bearing (7) is connected with rotation mandrel (1), rotates with rotation mandrel (1); The endoporus of the outer ring of first deep groove ball bearing (3), second deep groove ball bearing (7) and fittings body (6) is connected and fixed by interference fit; There is certain interval between rotation mandrel (1) and the fittings body (6); Offer first hydraulic fluid port (4) and second hydraulic fluid port (5) on the fittings body (6), offer first oil duct (10) and second oil duct (11) on the rotation mandrel (1), first hydraulic fluid port (4) is communicated to the rod chamber of oil hydraulic cylinder by first oil duct (10), and second hydraulic fluid port (5) is communicated to the rodless cavity of oil hydraulic cylinder by second oil duct (11).

2. seal swivel joint as claimed in claim 1, its feature also are, offer on the described end cap (9) and reveal hydraulic fluid port (8), offer on the described rotation mandrel (1) to reveal oil duct (12), reveal hydraulic fluid port (8) and are connected with leakage oil duct (12).

3. seal swivel joint as claimed in claim 1, its feature also is, the end that first deep groove ball bearing (3) is housed of described fittings body (6) is equipped with rotating seal ring (2) by saturating lid (13) sealing between saturating lid (13) and first deep groove ball bearing (3); The end that second deep groove ball bearing (7) is housed of fittings body (6) is equipped with seal ring by end cap (9) sealing between end cap (9) and the fittings body (6).

4. seal swivel joint as claimed in claim 3, its feature also is, described rotating seal ring (2) is made up of clamping section (2a), sealed lip (2b) and extension spring (2c), combine closely with sealed lip (2b) in clamping section (2a), extension spring (2c) is sleeved on the sealed lip (2b).

5. seal swivel joint as claimed in claim 4, its feature are that also described clamping section (2a) adopts canvas filler rubber to make; Described sealed lip (2b) adopts rubber to make.