CN208106877U - A kind of single-acting lift cylinders - Google Patents

Abstract

The utility model discloses a kind of single-acting lift cylinders, piston rod, the piston that it includes cylinder barrel, is equipped in cylinder barrel, the oil inlet that cylinder barrel is equipped with, the one end of piston rod in cylinder barrel is equipped with blind hole, boss is equipped among one end of piston, boss is connected in blind hole, and the central through hole through boss is equipped in piston, the check valve of sealing function is equipped in central through hole；Oil cylinder design is when hydraulic oil since leakage makes rod chamber generate extra hydraulic oil, hydraulic cylinder commutates moment, it is opened under the gas pressure effect that check valve compresses in rodless cavity, hydraulic oil reaches rodless cavity by check valve, hydraulic oil is discharged in rod chamber, therefore hydraulic cylinder rodless cavity back pressure appears in piston rod, will not influence rodless cavity, cylinder barrel rodless cavity need not weld oil return pipe, avoid cylinder barrel by oil return pipe and suck the problem of external humidification air causes inner wall to get rusty.

Description

A kind of single-acting lift cylinders

Technical field

The utility model relates to a kind of oil cylinder technical fields, more particularly, to a kind of improvement of single-acting lift cylinders.

Background technique

Single-acting lift cylinders only need thrust in one direction, and Patent Office of the People's Republic of China discloses a kind of one-way cylinder（It is open Number：CN2828406Y）, including between left end cylinder, cylinder body, hydraulic fluid port, piston piston rod, sealing ring left end cap and cylinder body pass through spiral shell Line connection, right end cap are also equipped with bearing, piston and cylinder body, bearing and piston rod by screw attachment on cylinder body, in right end cap Sealed by sealing ring, by seal with O ring between bearing and right end cap, right end cap and cylinder body, hydraulic fluid port only one, be located at institute Right side when piston is in cylinder body right end is stated, left end cap is provided with protective case, spring is also equipped between protective case and left side； But this single-acting lifting cylinder has oil liquid to leak into rod chamber from rodless cavity by sealing element in repeated multiple times movement, this Part oil liquid needs to be discharged, and otherwise makes to generate unnecessary back pressure in rod chamber, and seal fails is caused to reduce the thrust of oil cylinder, Mechanical requirements cannot be reached, need to increase a unnecessary oil return pipe discharge oil liquid, oil cylinder operation generates air pressure, gas pressure In oil pipe, cause external connection position that cannot seal, this often results in oil cylinder and enters humid air and water in actual use, leads It causes to get rusty in wet environment or outdoor inside oil cylinder.

Utility model content

The utility model technical issues that need to address are to provide a kind of single-acting lift cylinders, mainly solve existing skill The lifting rod chamber of single-acting present in art increases the technical issues of oil return pipe leads to oil cylinder internal rust.

The above-mentioned technical problem of the utility model is mainly to be addressed by following technical proposals：

The utility model is a kind of single-acting lift cylinders, including piston rod, the piston being equipped in cylinder barrel, cylinder barrel, on cylinder barrel The oil inlet being equipped with, the one end of piston rod in cylinder barrel are equipped with blind hole, are equipped with boss among one end of piston, boss is connected to blind It is equipped with the central through hole through boss in hole, in piston, the check valve of sealing function is equipped in central through hole；Oil cylinder design is worked as Hydraulic oil is since leakage makes rod chamber generate extra hydraulic oil, and hydraulic cylinder commutates moment, what check valve compressed in rodless cavity Gas pressure effect is lower to open, and hydraulic oil reaches rodless cavity by check valve, and hydraulic oil is discharged in rod chamber, thus hydraulic cylinder without Rod cavity back pressure appears in piston rod, will not influence rodless cavity, and cylinder barrel rodless cavity need not weld oil return pipe, avoids cylinder barrel and passes through The problem of oil return pipe sucking external humidification air causes inner wall to get rusty.

Preferably, the check valve apparatus includes check valve body, nonreturn valve core, check valve are equipped in check valve body Core one end is connected with spring, and the outer end of check valve apparatus is equipped with O-ring seals；The inner end of the check valve apparatus contacts close by line Envelope, check valve is realized by the elastic force of spring to be resetted, and the small check valve of spring pressure can be opened easily.

Preferably, the raised head face is radially provided with groove, one end of groove is connected to central through hole；In raised head face The groove being equipped with, it can be ensured that oil liquid is passed to unidirectional valve face.

Preferably, being fixedly connected between the boss and blind hole by elastic spring；Simply without sealing, it is ensured that there is bar In the blind hole that the oil liquid of intracavitary air and leakage can smoothly enter into piston rod when piston rises.

Therefore, the utility model structure single-acting lift cylinders solve rod chamber and increase oil pipe and cause what oil cylinder got rusty to ask Topic, it is simple and reasonable for structure.

Detailed description of the invention

Attached drawing 1 is a kind of structural schematic diagram of the utility model；

Attached drawing 2 is a kind of structural schematic diagram of the utility model check valve；

A kind of structural schematic diagram of 3 the utility model boss of attached drawing；

Components, position and number in figure：1, cylinder barrel, 2, piston rod, 3, piston, 4, oil inlet, 5, blind hole, 6, boss, 7, central through hole, 8, check valve, 9, check valve body, 10, nonreturn valve core, 11, spring, 12, O-ring seals, 13, groove, 14, steel Silk retaining ring, groove 13, elastic spring 14.

Specific embodiment

Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.

Embodiment：A kind of this example single-acting lift cylinders as shown in Figure 1, Figure 3 comprising the work being equipped in cylinder barrel 1, cylinder barrel Stopper rod 2, piston 3, the oil inlet 4 that cylinder barrel is equipped with, the one end of piston rod in cylinder barrel are equipped with blind hole 5, and piston is set among one end There is boss 6, raised head face is radially provided with the groove 13 of four connection central through holes 7；It is equipped in piston logical through the center of boss Hole 7, the interior check valve 8 for being equipped with sealing function of central through hole, boss are connected in blind hole by elastic spring 14.

Check valve 8 as shown in Figure 2 includes check valve body 9, is equipped with nonreturn valve core 10, nonreturn valve core one end in check valve body Check valve body bottom end is connected by spring 11, is sealed between check valve and central through hole by being equipped with O-ring seals 12.

When 2 raising of piston rod, oil liquid applies pressure Pv in rodless cavity, piston rod at the uniform velocity raising, check valve 8 at Pv not It can open；When piston rod is raised to top, air and hydraulic oil are gone to form pressure Pn in the blind hole 5 in piston rod in rodless cavity, Pv is greater than Pn at this time, and check valve can not be opened；Rodless cavity pressure Pv is equal to zero when oil cylinder commutates, and check valve is beaten under Pn effect It opens, oil liquid leads to check valve and flows to rodless cavity, and piston rod decline Pn is decreased to zero closed check valve.

The foregoing is merely the structure features of specific embodiment of the utility model, but the utility model to be not limited to This, in the field of the utility model, made changes or modifications all cover practical new at this any those skilled in the art Among the scope of the patents of type.

Claims (4)

1. a kind of single-acting lift cylinders, including cylinder barrel（1）, the piston rod that is equipped in cylinder barrel（2）, piston（3）, what cylinder barrel was equipped with Oil inlet（4）, it is characterised in that the one end of the piston rod in cylinder barrel is equipped with blind hole（5）, among described piston one end Equipped with boss（6）, boss is connected in blind hole, equipped with the central through hole through boss in the piston（7）, in central through hole Check valve equipped with sealing function（8）.

2. a kind of single-acting lift cylinders according to claim 1, it is characterised in that the check valve（8）Including check valve Body（9）, check valve body is interior to be equipped with nonreturn valve core（10）, nonreturn valve core one end passes through spring（11）Connect check valve body bottom end, institute O-ring seals are equipped between the check valve and central through hole stated（12）.

3. a kind of single-acting lift cylinders according to claim 1, it is characterised in that the boss（6）End face is radially provided with Groove（13）, groove one end is connected to central through hole（7）.

4. a kind of single-acting lift cylinders according to claim 1 or 3, it is characterised in that the boss（6）With blind hole（5） Inner wall pass through elastic spring（14）It is fixedly connected.