CN202418094U - Anti-swelling multi-stage hydraulic cylinder used for sanitation vehicle - Google Patents

Abstract

The utility model discloses an anti-swelling multi-stage hydraulic cylinder used for a sanitation vehicle, which comprises an outer cylinder barrel (1), intermediate-stage cylinder barrels and a piston rod. Both the outer cylinder barrel (1) and the intermediate-stage cylinder barrels are connected with front caps, and sealing pieces are arranged on both the intermediate-stage cylinder barrels and the piston rod. The anti-swelling multi-stage hydraulic cylinder used for the sanitation vehicle is characterized in that oil holes, decompression holes and starting holes are all arranged on the intermediate-stage cylinder barrels, oil holes, decompression holes and starting holes are arranged on the piston rod and communicated with corresponding cavities respectively, the piston rod is provided with an extension rod (22), a protracting oil port (20), a retracting oil port (21) are arranged on the extension rod (22), the protracting oil port (20) is communicated with an oil pipe (18), the oil pipe (18) is communicated with the outer cylinder barrel (1) and a left end cavity formed by the intermediate-stage cylinder barrels connected with the outer cylinder barrel (1), and the retracting oil port (21) is communicated with a cavity of the piston rod. The anti-swelling multi-stage hydraulic cylinder used for the sanitation vehicle is long in service life and hard to deform.

Description

A kind of environmental sanitation vehicles is with the anti-multistage hydraulic cylinder that expands

Technical field:

The utility model relates to a kind of multistage hydraulic cylinder, relates in particular to a kind of environmental sanitation vehicles with the anti-multistage hydraulic cylinder that expands.

Background technique:

(the utility model is an example with three grades to environmental sanitation vehicles in the past with multistage hydraulic cylinder; Referring to Fig. 1) constitute by outer cylinder 1, cylinder barrel I 2, cylinder barrel II 3, piston rod 4, protecgulum I 5, protecgulum II 6, protecgulum III 7 etc., piston rod 4 is provided with Sealing I 8, and cylinder barrel II 3 is provided with Sealing II 9; Cylinder barrel I 2 is provided with Sealing III 10; Form D chamber 14, E chamber 15, F chamber 16, G chamber 17, H chamber 19 between outer cylinder 1, each intergrade cylinder barrel, the piston rod 4, cylinder barrel I 2 is provided with that oil-through hole A 11, cylinder barrel II 3 are provided with oil-through hole B 12, piston rod 4 is provided with oil-through hole C 13, and an end of piston rod 4 is provided with extension bar 22; Extension bar 22 is provided with overhanging hydraulic fluid port 20, retraction hydraulic fluid port 21; Overhanging hydraulic fluid port 20 communicates with oil pipe 18, and oil pipe 18 communicates with H chamber 19, and retraction hydraulic fluid port 21 communicates with G chamber 17.Its in use normal generation is expanded cylinder phenomenon (being that certain one deck cylinder barrel external diameter becomes greatly) and is caused scrapping; Its reason is to occur disorderly level in the overhanging process; Be the cylinder barrel I when also not reaching terminal point the cylinder barrel II just begin relative movement with it (or cylinder barrel II when also not reaching terminal point piston rod just begin relative movement with it); Momentary status as shown in Figure 2 will occur like this: the Sealing II is sealed oil-through hole A (or the Sealing I is sealed oil-through hole B); Hydraulic oil in the D chamber can not be discharged, and H cavity pressure oil (20～25MPa) active area is the left side gross area of maximum first stage piston, itself and the ratio＞5:1 of D chamber annular cross section area; So oil pressure moment in D chamber rises to more than the 100MPa, (yield limit that has surpassed outer cylinder) causes outer cylinder outwards to produce permanent deformation.

The model utility content:

The purpose of the utility model is to overcome the deficiency of above-mentioned prior art and a kind of long service life is provided, and on-deformable environmental sanitation vehicles is with the anti-multistage hydraulic cylinder that expands.

The purpose of the utility model can reach through following measure: a kind of environmental sanitation vehicles is with the anti-multistage hydraulic cylinder that expands, and it comprises outer cylinder, is provided with the intergrade cylinder barrel in the outer cylinder; Be provided with piston rod in the intergrade cylinder barrel; Outer cylinder and intergrade cylinder barrel all connect protecgulum, are equipped with Sealing on each intergrade cylinder barrel and the piston rod, between outer cylinder and the coupled intergrade cylinder barrel, between each intergrade cylinder barrel, between piston rod and the coupled intergrade cylinder barrel, all form cavity in the piston rod; It is characterized in that being equipped with on the intergrade cylinder barrel oil-through hole, relief hole, Starting Hole; Piston rod is provided with oil-through hole, oil-through hole, relief hole, Starting Hole respectively and corresponding with it cavity be communicated with, piston rod is provided with extension bar; Extension bar is provided with overhanging hydraulic fluid port, retraction hydraulic fluid port; Overhanging hydraulic fluid port is communicated with oil pipe, and oil pipe is communicated with the left end cavity that outer cylinder and coupled intergrade cylinder barrel form, and the retraction hydraulic fluid port communicates with the cavity of piston rod.

The utility model is compared with prior art can produce following good effect: the utility model has increased starting area control structure and relief hole than environmental sanitation vehicles in the past with multistage hydraulic cylinder.Right side, the left and right sides end face of second level piston and the left side of minimum first stage piston of maximum first stage piston all have less roughness; And mutual parallelism very high (realizing with the perpendicularity of center line separately through guaranteeing respectively); After they were fitted each other, junction plane can be not oily excessively.The starting area of maximum one-level is the poor of φ T and φ S area, the annular cross section area that partial starting area is the Q1 chamber (pressure oil gets into the Q1 chamber through Starting Hole 1), and the starting area of minimum one-level is merely the area of φ S.The ratio of (in position shown in Figure 3) three grades of suffered overhanging active forces (oil pressure active force and static friction force poor, minimum one-level also will deduct load force) is greater than 9:3:1.After the maximum one-level starting, three grades move right synchronously; After maximum one-level was reached home, the second level and minimum one-level continued to move right synchronously.Though the compression area of minimum one-level has increased the annular cross section area (pressure oil gets into the Q2 chambeies through Starting Hole 2) in Q2 chamber at this moment, partial compression area has increased the poor of φ Z and φ S area especially; After reaching home in the second level, minimum one-level continues to move right the range until reaching multistage cylinder.Like this, do not had random level, just avoided bloated cylinder phenomenon yet.Above-mentioned starting area control structure can not definitely be avoided the disorderly generation of level phenomenon.Poor such as being in when the Sealing III groove bottom of cylinder barrel I footpath and cylinder barrel II external diameter; The internal diameter and the protecgulum I rod seal circle groove bottom of outer cylinder directly are in allowance below nominal size simultaneously, and particularly the form and position tolerance (coaxality of circularity, cylindricity, straightness accuracy, right-hand member internal thread) when the outer cylinder endoporus is in the upper limit, and the suffered static friction force of cylinder barrel I reaches maximum value; Its starting force just might be less than the second level (in like manner partial starting force also might less than the third level); At this moment also state shown in Figure 4 can appear, but because the existence of relief hole a (relief hole b), the D chamber can not generate high pressure in (E chamber); Press together in final and H chamber; Form differential state, can normally accomplish the maximum functional stroke equally, cylinder can not expand.

Description of drawings:

The structural representation of the multistage hydraulic cylinder that Fig. 1 uses for existing environmental sanitation vehicles;

Fig. 2 is the bloated cylinder view of Fig. 1;

Fig. 3 is the structural representation (is example with three grades) of the utility model;

Fig. 4 is the anti-view that expands of the pressure release of Fig. 3.

Embodiment: elaborate below in conjunction with the preferred forms of accompanying drawing to the utility model:

Embodiment: a kind of environmental sanitation vehicles is with the anti-multistage hydraulic cylinder (referring to Fig. 3, Fig. 4) that expands, and the utility model is an example with three grades, and it comprises outer cylinder 1; Establish cylinder barrel I 2 in the outer cylinder 1, establish cylinder barrel II 3 in the cylinder barrel I 2, be provided with piston rod 4 in the cylinder barrel II 3; The right-hand member of outer cylinder 1 connects protecgulum I 5, and the right-hand member of cylinder barrel I 2 connects protecgulum II 6, and the right-hand member of cylinder barrel II 3 connects protecgulum III 7; Piston rod 4 is provided with Sealing I 8, and cylinder barrel II 3 is provided with Sealing II 9, and cylinder barrel I 2 is provided with Sealing III 10; Form D chamber 14, H chamber 19 between outer cylinder 1 and the cylinder barrel I 2, form E chamber 15, Q1 chamber 27 between cylinder barrel I 2 and the cylinder barrel II 3, form F chamber 16, Q2 chamber 28 between cylinder barrel II 3 and the piston rod 4; Form G chamber 17 in the piston rod 4, cylinder barrel I 2 is provided with oil-through hole A 11, relief hole A 23, Starting Hole A 25, and oil-through hole A 11 and relief hole A 23 are communicated with D chamber 14, E chamber 15 respectively; Starting Hole A 25 is communicated with H chamber 19, Q1 chamber 27 respectively, and cylinder barrel II 3 is provided with oil-through hole B 12, relief hole B 24, Starting Hole B 26, and oil-through hole B 12 and relief hole B 24 are communicated with E chamber 15, F chamber 16 respectively; Starting Hole B 26 is communicated with Q1 chamber 27, Q2 chamber 28 respectively, and piston rod 4 is provided with oil-through hole C 13, and oil-through hole C 13 is communicated with F chamber 16, G chamber 17 respectively; The right-hand member of piston rod 4 is provided with extension bar 22, and extension bar 22 is provided with overhanging hydraulic fluid port 20, retraction hydraulic fluid port 21, and overhanging hydraulic fluid port 20 communicates with oil pipe 18; Oil pipe 18 communicates with H chamber 19, and retraction hydraulic fluid port 21 communicates with G chamber 17.

The utility model is applied in less and the occasion that stroke is bigger of mounting distance, and the difference of stroke and mounting distance is big more, and the progression that needs is many more.

Its normal course of action is following:

［ overhanging process ］: pressure oil gets into from overhanging hydraulic fluid port 20; Arrive H chamber 19 through oil pipe 18; Promoting cylinder barrel I 2, cylinder barrel II 3 and piston rod 4 moves right synchronously; The oil return in D chamber 14 is arrived G chamber 17 through oil-through hole A 11, E chamber 15, oil-through hole B 12, F chamber 16, oil-through hole C 13, through 21 times hydraulic stations of retraction hydraulic fluid port; Cylinder barrel I 2 touches the 5 back stop motions of protecgulum I, and cylinder barrel II 3 and piston rod 4 continue to move right synchronously, and the oil return in E chamber 15 is through oil-through hole B 12, F chamber 16, oil-through hole C 13, G chamber 17,21 times hydraulic stations of retraction hydraulic fluid port; Cylinder barrel II 3 touches the 6 back stop motions of protecgulum II, and piston rod 4 continues to move right, and the oil return in F chamber 16 is through oil-through hole C 13, G chamber 17,21 times hydraulic stations of retraction hydraulic fluid port.Piston rod 4 touches the 7 back stop motions of protecgulum III, and this moment, multistage hydraulic cylinder all stretched out, and reached range.

［ retraction process ］: pressure oil gets into from retraction hydraulic fluid port 21, through G chamber 17, oil-through hole C 13 is to F chamber 16, promotes piston rod 4 to left movement; After piston rod 4 touched cylinder barrel II 3, pressure oil to E chamber 15, promoted cylinder barrel II 3 (synchronous with piston rod) to left movement through oil-through hole B 12; After cylinder barrel II 3 touched cylinder barrel I 2, pressure to D chamber 14, promoted cylinder barrel I 2 (synchronous with cylinder barrel II and piston rod) to left movement through oil-through hole A 11; After cylinder barrel I 2 touched outer cylinder 1 (bonnet), multistage hydraulic cylinder was all withdrawn.In whole retraction process, the oil return in H chamber 19 is through oil pipe 18,20 times hydraulic stations of overhanging hydraulic fluid port.

Claims (1)

1. an environmental sanitation vehicles is with the anti-multistage hydraulic cylinder that expands, and it comprises outer cylinder (1), and outer cylinder is provided with the intergrade cylinder barrel in (1); Be provided with piston rod in the intergrade cylinder barrel; Outer cylinder (1) and intergrade cylinder barrel all connect protecgulum, are equipped with Sealing on each intergrade cylinder barrel and the piston rod, between outer cylinder (1) and the coupled intergrade cylinder barrel, between each intergrade cylinder barrel, between piston rod and the coupled intergrade cylinder barrel, all form cavity in the piston rod; It is characterized in that being equipped with on the intergrade cylinder barrel oil-through hole, relief hole, Starting Hole; Piston rod is provided with oil-through hole, oil-through hole, relief hole, Starting Hole respectively and corresponding with it cavity be communicated with, piston rod is provided with extension bar (22); Extension bar (22) is provided with overhanging hydraulic fluid port (20), retraction hydraulic fluid port (21); Overhanging hydraulic fluid port (20) is communicated with oil pipe (18), and oil pipe (18) is communicated with the left end cavity that outer cylinder (1) and coupled intergrade cylinder barrel form, and retraction hydraulic fluid port (21) communicates with the cavity of piston rod.

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