CN201636115U

CN201636115U - Mechanical self-locking hydraulic cylinder

Info

Publication number: CN201636115U
Application number: CN2010201278204U
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: 2010-11-17
Anticipated expiration: 2020-03-10

Abstract

The utility model relates to improvement of a hydraulic cylinder, in particular to a mechanical self-locking hydraulic cylinder. For the mechanical self-locking hydraulic cylinder, based on the traditional hydraulic cylinder, a spring locking structure is provided; a sliding sleeve is ejected-out by using the self-reset of the spring; the conical surface of the sliding sleeve compresses a steel ball, the steel ball is fixed in a ring-shaped groove of the cylinder body so as to lead the cylinder body and a piston rod not to relatively move, and plays a role in locking the piston rod. The mechanical self-locking hydraulic cylinder with simple structure, easy maintenance and convenient use can effectively lock the piston rod and ensure normal work of the device, even if leakage exists or a rod-free cavity does not supply pressure oil during long-period using of the hydraulic cylinder.

Description

The mechanical self-latching oil hydraulic cylinder

Technical field

The utility model belongs to the hydraulic equipment technical field, relates to a kind of improvement of oil hydraulic cylinder, specifically is a kind of mechanical self-latching oil hydraulic cylinder that possesses auto-lock function.

Background technique

Oil hydraulic cylinder is a kind of application area equipment very widely, as working medium, the variation by sealed volume comes transmitting movement, comes transferring power by the fluid pressure inside with fluid for it, can hydraulic pressure be can change into mechanical energy, straight reciprocating motion or oscillating motion done.Oil hydraulic cylinder is made up of several parts such as piston rod, cylinder body, piston and sealing systems usually.Development along with oil hydraulic cylinder, be applied in more and more on the vertical jacking apparatus, guide rail locking apparatus, milling train locking device of radar fix device, the bridge formation machine of some machinery such as space flight navigation, in these applications, the piston rod of oil hydraulic cylinder need remain on the same position state within a certain period of time usually and can not have mobile.Such requirement was to realize by Pilot operated check valve of serial connection on the return line of oil hydraulic cylinder in the past, but there is following shortcoming in this lock mode: leak because oil hydraulic cylinder can not be accomplished to seal completely not have, particularly under the situation of bearing certain pressure, leaking appears in hydraulic oil unavoidably, at this time piston rod will produce certain displacement, thereby has influence on the working efficiency and the Security of equipment.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of structure ingenious reasonable, safe and reliable mechanical self-latching oil hydraulic cylinder, the piston rod of this oil hydraulic cylinder locks by the mechanical self-latching mode, can avoid oil hydraulic cylinder to shorten, guarantee the equipment proper functioning because of external leakage causes stroke.

The technological scheme that provides according to the utility model, described mechanical self-latching oil hydraulic cylinder comprises the piston rod that cylinder body and dress can move freely within it, the piston rod tail end is equipped with piston, piston is divided into rod chamber and rodless cavity with cylinder body, rod chamber is by rod chamber hydraulic fluid port turnover hydraulic oil, and rodless cavity is by rodless cavity hydraulic fluid port turnover hydraulic oil; The head end of cylinder body is connected with cylinder head, in the cylinder body of cylinder head inboard sliding sleeve is installed, and the center of cylinder head and sliding sleeve offers center hole, and the head end of piston rod passes center hole, and the center hole sealed sliding on piston rod and cylinder head, the sliding sleeve movingly; It is characterized in that, in the cylinder body along head end caudad direction be divided into first position with first internal diameter and second position with second internal diameter, first internal diameter is greater than second internal diameter; Cylinder head, sliding sleeve sealing are assemblied in first position of cylinder body; Between cylinder head, the sliding sleeve spring is housed, spring one end is pressed on the cylinder head, and the other end is pressed on sliding sleeve on the interior edge face at first position; Center hole edge on the other end of described sliding sleeve extends axially backward and forms an extension, and the external diameter of extension is less than second internal diameter of described cylinder body, and the diameter of extension tail end diminishes gradually, shrinks to form the conical surface; Be concaved with an annular groove on the inwall at cylinder body second position, the transverse section of annular groove is arc or semicircle; On the front-end face of piston, be provided with an annular cavity, the perisporium of annular cavity is provided with a circular groove, be equipped with at least one steel ball in the circular groove, the internal diameter of annular cavity is greater than the external diameter of extension, the extension can be inserted annular cavity and be contacted steel ball, the radius of steel ball is less than the radius of described annular groove, and steel ball can be contained in the annular groove.

As further improvement of the utility model, be concaved with the cylinder head spring eye and the sliding sleeve spring eye that are used for putting spring on described cylinder head and the sliding sleeve opposing end faces respectively.

As further improvement of the utility model, described rodless cavity hydraulic fluid port and rod chamber hydraulic fluid port are opened in the head end of piston rod, the rodless cavity hydraulic fluid port is communicated to the oil hydraulic cylinder rodless cavity by the rodless cavity oil duct on the piston rod, and the rod chamber hydraulic fluid port is communicated to the oil hydraulic cylinder rod chamber by the rod chamber oil duct on the piston rod.

The utility model compared with prior art, advantage is: simple in structure, be easy to safeguard, easy to use.Do not supply at rodless cavity under the situation of pressure oil; steel ball is fixed in the interior annular groove of cylinder body; make cylinder body and the piston rod can not relative movement; piston rod is positioned original position firmly; can not fall automatically because of the rodless cavity release; play the effect of latching ram bar effectively, protected working equipment effectively.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Description of reference numerals: 1-piston rod, 2-cylinder head, 3-flange, 4-spring, 5-sliding sleeve, 6-cylinder body, 7-extension, 8-annular groove, the 9-conical surface, 10-steel ball, 11-piston, 12-rodless cavity, 13-annular cavity, 14-second position, 15-rod chamber, 16-first position, 17-rodless cavity oil duct, 18-rodless cavity oil duct, 19-rodless cavity hydraulic fluid port, 20-rod chamber hydraulic fluid port, D1-first internal diameter, D2-second internal diameter.

Embodiment

The utility model is described in further detail below in conjunction with concrete drawings and Examples.

As shown in Figure 1, mechanical self-latching oil hydraulic cylinder described in the utility model mainly is made up of parts such as piston rod 1, cylinder head 2, flange 3, spring 4, sliding sleeve 5, cylinder body 6, steel ball 10 and pistons 11.

As shown in Figure 1, piston rod 1 is contained in the cylinder body 6 and can moves freely, and piston rod 1 tail end is equipped with piston 11, and piston 11 is divided into rod chamber 15 and rodless cavity 12 with cylinder body 6; In the cylinder body 6 along head end caudad direction be divided into first position 16 and have second position, 14, the first inside diameter D 1 of second inside diameter D 2 greater than second inside diameter D 2 with first inside diameter D 1; The head end of cylinder body 6 is connected with cylinder head 2 by flange 3, in the cylinder body 6 of cylinder head 2 inboards, sliding sleeve 5 is installed, cylinder head 2 offers center hole with the center of sliding sleeve 5, and the head end of piston rod 1 passes center hole, and the center hole sealed sliding on piston rod 1 and cylinder head 2, the sliding sleeve 5 movingly; Cylinder head 2, sliding sleeve 5 sealings are assemblied in first position 16 of cylinder body 6, spring 4 with strong reset function is housed between cylinder head 2, the sliding sleeve 5, be concaved with cylinder head spring eye and the sliding sleeve spring eye that is used for putting spring 4 respectively on cylinder head 2 and sliding sleeve 5 opposing end faces, spring 4 one ends are pressed on the cylinder head 2, and the other end is pressed on sliding sleeve 5 on the interior edge face at first position 16; Center hole edge on the other end of described sliding sleeve 5 extends axially backward and forms an extension 7, and the external diameter of extension 7 is less than second inside diameter D 1 of described cylinder body 6, and the diameter of extension 7 tail ends diminishes gradually, shrinks to form the conical surface 9; Be concaved with an annular groove 8 on the inwall at cylinder body 6 second positions 14, the transverse section of annular groove 8 is arc or semicircle; On the front-end face of piston 11, be provided with an annular cavity 13, the perisporium of annular cavity 13 is provided with a circular groove, be equipped with a plurality of steel balls 10 in the circular groove, the internal diameter of annular cavity 13 is greater than the external diameter of extension 7, extension 7 can be inserted annular cavity 13 and be contacted steel ball 10, the radius of steel ball 10 is less than the radius of described annular groove 8, and steel ball 10 can be contained in the annular groove 8; The head end of described piston rod 1 offers rodless cavity hydraulic fluid port 19 and rod chamber hydraulic fluid port 20, rodless cavity hydraulic fluid port 19 is communicated to oil hydraulic cylinder rodless cavity 12 by the rodless cavity oil duct 17 on the piston rod 1, and rod chamber hydraulic fluid port 20 is communicated to oil hydraulic cylinder rod chamber 15 by the rod chamber oil duct 18 on the piston rod 1.

Working principle of the present utility model and working procedure are as follows:

Lock operation: when rodless cavity 12 oil-feeds, during rod chamber 15 oil returns, hydraulic oil promotion piston 11 and piston rod 1 are to left movement, and piston rod 1 stretches out, and piston 11 drives steel balls 10 and is moved to the left, steel ball 10 contacts the conical surface 9 of sliding sleeve 5 and overcomes the thrust of spring 4, promote sliding sleeve 5 and be moved to the left, when moving to certain position, steel ball 10 enters in the annular groove 8 on cylinder body 6 inner hole walls, oil hydraulic cylinder arrives working stroke, and piston rod 1 can not move again; At this moment, rodless cavity 12 stops oil-feed, and spring 4 relies on the elastic reset of self and promotes sliding sleeve 5 and moves right, and the conical surface 9 of sliding sleeve 5 is fixed on steel ball 10 extruding in the annular groove 8, and making between piston rod 1 and the cylinder body 6 can not relative movement, thus pinning piston rod 1.

Unlocking operation: rod chamber 15 oil-feeds, during rodless cavity 12 oil returns, the thrust that the thrust that hydraulic oil produces at first overcomes spring 4 promotes sliding sleeve 5 to left movement, and the conical surface 9 and the steel ball 10 of sliding sleeve 5 disengage, steel ball 10 in the annular groove 8 of cylinder body 6 is replied free state, and this moment, oil hydraulic cylinder was separated open locking; The pressure that produces of hydraulic oil promotes piston 11 and piston rod 1 moves right again then, and in piston rod 1 retract cylinder 6, steel ball 10 moves right with piston 11.

Claims

1. mechanical self-latching oil hydraulic cylinder, comprise the piston rod (1) that cylinder body (6) and dress can move freely within it, piston rod (1) tail end is equipped with piston (11), piston (11) is divided into rod chamber (15) and rodless cavity (12) with cylinder body (6), rod chamber (15) is by rod chamber hydraulic fluid port (20) turnover hydraulic oil, and rodless cavity (12) is by rodless cavity hydraulic fluid port (19) turnover hydraulic oil; The head end of cylinder body (6) is connected with cylinder head (2), in the cylinder body (6) of cylinder head (2) inboard, sliding sleeve (5) is installed, cylinder head (2) offers center hole with the center of sliding sleeve (5), the head end of piston rod (1) passes center hole, and the center hole sealed sliding on piston rod (1) and cylinder head (2), the sliding sleeve (5) movingly; It is characterized in that, in the cylinder body (6) along head end caudad direction be divided into first position (16) with first internal diameter (D1) and second position (14) with second internal diameter (D2), first internal diameter (D1) is greater than second internal diameter (D2); Cylinder head (2), sliding sleeve (5) sealing are assemblied in first position (16) of cylinder body (6); Between cylinder head (2), the sliding sleeve (5) spring (4) is housed, spring (4) one ends are pressed on the cylinder head (2), and the other end is pressed on sliding sleeve (5) on the interior edge face of first position (16); Center hole edge on the other end of described sliding sleeve (5) extends axially backward and forms an extension (7), the external diameter of extension (7) is less than second internal diameter (D1) of described cylinder body (6), the diameter of extension (7) tail end diminishes gradually, shrinks to form the conical surface (9); Be concaved with an annular groove (8) on the inwall at cylinder body (6) second positions (14), the transverse section of annular groove (8) is arc or semicircle; On the front-end face of piston (11), be provided with an annular cavity (13), the perisporium of annular cavity (13) is provided with a circular groove, be equipped with at least one steel ball (10) in the circular groove, the internal diameter of annular cavity (13) is greater than the external diameter of extension (7), extension (7) can be inserted annular cavity (13) and be contacted steel ball (10), the radius of steel ball (10) is less than the radius of described annular groove (8), and steel ball (10) can be contained in the annular groove (8).

2. mechanical self-latching oil hydraulic cylinder as claimed in claim 1, its feature also are, are concaved with cylinder head spring eye and the sliding sleeve spring eye that is used for putting spring (4) respectively on described cylinder head (2) and sliding sleeve (5) opposing end faces.

3. mechanical self-latching oil hydraulic cylinder as claimed in claim 1, its feature also is, described rodless cavity hydraulic fluid port (19) and rod chamber hydraulic fluid port (20) are opened in the head end of piston rod (1), rodless cavity hydraulic fluid port (19) is communicated to oil hydraulic cylinder rodless cavity (12) by the rodless cavity oil duct (17) on the piston rod (1), and rod chamber hydraulic fluid port (20) is communicated to oil hydraulic cylinder rod chamber (15) by the rod chamber oil duct (18) on the piston rod (1).