CN208252466U - Hydraulic device - Google Patents

Abstract

The utility model provides a kind of hydraulic device, which includes work head assembly and hydraulic device, and hydraulic device includes driving assembly, pump oil component, hydraulic cylinder assembly and piston spring assembly.Pump oil component is connected to driving assembly, pumps out oil liquid under the action of driving assembly.Hydraulic cylinder assembly includes cylinder body, has fuel feed hole and oil return hole on cylinder body, work head assembly protrudes into cylinder body.Piston spring assembly includes big piston assembly and small piston assembly.Big piston assembly includes big piston head, big piston rod and the reset spring being sheathed on big piston rod, has a piston hole opened up along piston rod length direction on big piston head.Small piston assembly includes small piston head, small piston rod and the return spring being sheathed on small piston rod, and small piston rod passes through piston hole, and small piston head blocks piston hole；When the end of small piston assembly moves to work head assembly, small piston head opens piston hole, is connected to the oil pocket of big piston rod two sides, oil liquid flows into oil return hole through piston hole.

Description

Hydraulic device

Technical field

The utility model relates to technical field of hydraulic pressure, and in particular to a kind of hydraulic device.

Background technique

Under the rapid development of China's economy, people's lives level is continuously improved, to major infrastructure and building construction Demand it is increasing, it is also higher and higher to the quality requirement of engineering.Steel form is the weight that concrete constructs in engineering construction Component part is wanted, it has the advantages that reducing operating cost, easily operated, saving material, performance is good.With arriving for industrial age Come, for steel form as the pillar in construction material, its specification quality affects the construction success or failure of China's building.

The process equipment of steel form is hydraulic process equipment at present, and most hydraulic process equipment is unidirectional oil liquid stream Logical, oil return usually requires to carry out manual oil return.Also occurs a kind of two-way oil liquid stream on the market at present to improve the efficiency of processing Logical hydraulic process equipment, this kind of equipment need to be arranged switching valve to realize retracting automatically for piston, but oily in this kind of equipment The setting in road is very complicated, during use detonation or the problem of oil liquid leakage frequent occurrence.

In addition, that there is typically further work noises is big, the service life is short, leakproofness is poor, movement parts mill for existing hydraulic process equipment The problems such as damage is big, low oil pressure.Poorly sealed, part is easy to appear since manufacturing process is poor, between binding face to misalign, wear greatly Equal undesirable conditions cause the mechanical performance of equipment to decline, temperature raising, noise increase, the rough sledding such as service life reduction.

Utility model content

The utility model provides to overcome the problems such as oil duct irrational distribution is easy to produce detonation in existing hydraulic device A kind of oil duct is distributed compact and safe to use hydraulic device.

To achieve the goals above, the utility model provides a kind of hydraulic device, which includes work head assembly And hydraulic device, hydraulic device include driving assembly, pump oil component, hydraulic cylinder assembly and piston spring assembly.Pump oil component It is connected to driving assembly, pumps out oil liquid under the action of driving assembly.Hydraulic cylinder assembly includes cylinder body, has connection on cylinder body The fuel feed hole and oil return hole of pump oil component, work head assembly protrude into cylinder body.Piston spring assembly is set in cylinder body, piston bullet Spring assembly includes big piston assembly and small piston assembly.Big piston assembly includes big piston head, big piston rod and is sheathed on big Reset spring on piston rod has a piston hole opened up along piston rod length direction on big piston head.Small piston assembly packet Small piston head, small piston rod and the return spring being sheathed on small piston rod are included, small piston rod passes through piston hole, small piston head Block piston hole；When the end of small piston assembly moves to work head assembly, small piston head opens piston hole, is connected to big piston The oil pocket of bar two sides, oil liquid flow into oil return hole through piston hole.

An embodiment according to the present utility model, small piston assembly further include the locating part being set on small piston rod, when When small piston head opens piston hole, locating part limits the movement travel of small piston rod, and return spring is set in small piston head and limit Between the part of position.

An embodiment according to the present utility model, small piston rod include first body of rod and for being set in turn in small piston head Bipole body, the diameter of first body of rod are greater than the diameter of second body of rod, and locating part is to lock across second body of rod and with first body of rod Nut.

An embodiment according to the present utility model, small piston assembly further include that be relatively arranged on locating part with return spring another Protect spring in the position of crossing of side.

An embodiment according to the present utility model, cylinder body are in hollow tubular, have multiple fuel feed holes on the bottom of cylinder body And oil return hole, there is in the side wall of cylinder body the drainback passage of connection oil return hole, there is oil return into hole in the interior side-wall surface of cylinder body, When small piston head opens piston hole, the oil liquid in oil pocket is driven to enter oil return into hole and drainback passage through piston hole, oil return Hole.

An embodiment according to the present utility model, the quantity of fuel feed hole is even number on cylinder body, and two fuel feed holes form a pair, Multipair fuel feed hole is evenly distributed in the circumferential direction of cylinder base, all has a U-shaped counterbore on the position of every a pair of fuel feed hole, and two Fuel feed hole is provided with the bottom of U-shaped counterbore.

An embodiment according to the present utility model, hydraulic cylinder assembly further include relief valve or regulating valve, and cylinder body is close to bottom Lateral wall on at least one lug boss radially, there is the radially installed hole of connection driving oil pocket on lug boss, let out Pressure valve or regulating valve are installed in radially installed hole.

An embodiment according to the present utility model, work head assembly are perforating press head assembly, perforating press head assembly packet Include head body and dynamic punching head.The middle part of head body has a throat for placing material to be processed, and throat is close to hydraulic dress The side set offers dynamic punching head mounting hole, and the other side of throat has quiet punching seat.Dynamic punching head is installed on dynamic punching head In mounting hole, the end of the big piston rod in hydraulic device, which is protruded into dynamic punching head mounting hole, connects dynamic punching head.

An embodiment according to the present utility model, big piston assembly further include flat key, have installation flat key on big piston rod Flat key slot, offer axially directed slot on work head assembly, flat key is mounted on guide groove by fixing piece, and big piston rod follows Flat key is axially movable.

An embodiment according to the present utility model, work head assembly are cutting nipper work head, cut expansion pincers work head, expander Any one of work head and bending machine work head.

In conclusion hydraulic device provided by the utility model is defeated by oil liquid by setting driving assembly and pump oil component It send to hydraulic cylinder.By the way that piston hole is arranged on the big piston head of piston spring assembly, small piston assembly is mounted on piston hole It is interior.In the initial state, small piston head blocks piston hole, when oil liquid enters driving oil pocket and piston spring assembly is pushed to move ahead When, since work head assembly is extend into cylinder body, the end of small piston assembly can be in contact with work head assembly, small piston assembly Stress is driven in the wrong direction, and piston hole is opened, and the oil liquid in oil pocket is driven to enter in the oil pocket of the other side through piston hole, and oil liquid passes through on cylinder body Oil return hole carries out oil return, and the oil pressure in the oil pocket of two sides disappears, and big piston rod automatically resets under the action of reset spring.This implementation The hydraulic device that example provides realizes the automatic release of oil liquid, total by the way that small piston assembly is arranged in big piston assembly It is very compact and ingenious, as long as small piston assembly and the contact of work head assembly can realize the release of oil liquid, using unusual Safety.

Further, by the way that relief valve or regulating valve are arranged on hydraulic cylinder assembly, when the oil pressure in driving oil pocket is excessively high When, relief valve starting realizes slow pressure release, the intracorporal pressure of cylinder is made to be maintained at setting range while completing high-pressure work It is interior.By the different pressing force of setting regulating valve pressure limit spring, to reach different maximum instantaneous oil pressure level adjustment.When When oil pressure is greater than the pressing force of regulating valve pressure limit spring in driving oil pocket in hydraulic cylinder, the unlatching of regulating valve, release is accordingly Oil pressure, to reach normal oil pressure level.The setting of relief valve or regulating valve can further improve the peace that hydraulic device uses Quan Xing.

For above and other objects, features and advantages of the utility model can be clearer and more comprehensible, preferable reality is cited below particularly Example is applied, and cooperates attached drawing, is described in detail below.

Detailed description of the invention

Fig. 1 show the structural schematic diagram of the hydraulic device of an embodiment of the present invention offer.

Fig. 2 show the structural schematic diagram of piston spring assembly in Fig. 1.

Fig. 2A is structural schematic diagram of the Fig. 2 under another visual angle.

Fig. 2 B show the cross-sectional view of Fig. 2.

Fig. 2 C show the cross-sectional view of small piston assembly in Fig. 2.

Fig. 3 show the structural schematic diagram of hydraulic cylinder assembly.

Fig. 3 A show structural schematic diagram of the Fig. 3 under another visual angle.

Fig. 3 B show the structural schematic diagram of relief valve in Fig. 3.

Fig. 3 C show the structural schematic diagram of regulating valve in Fig. 3.

Fig. 4 show the structural schematic diagram of work head assembly.

Fig. 4 A show the cross-sectional view of Fig. 4.

Fig. 4 B show the structural schematic diagram of dynamic punching head.

Fig. 5 show the decomposition diagram of driving assembly.

Fig. 6 show the structural schematic diagram of pump oil component.

Fig. 6 A show the assembling schematic diagram of plunger tray Yu multiple plungers.

Specific embodiment

As shown in Fig. 1 to Fig. 2 C, hydraulic device provided in this embodiment includes work head assembly 100 and hydraulic device 200, Hydraulic device 200 includes driving assembly 1, pump oil component 2, hydraulic cylinder assembly 3 and piston spring assembly 4.Pump oil component 2 connects In driving assembly 1, oil liquid is pumped out under the action of driving assembly 1.Hydraulic cylinder assembly 3 includes cylinder body 31, is had on cylinder body 31 It is connected to the fuel feed hole 311 and oil return hole 312 of pump oil component, work head assembly 100 protrudes into cylinder body 31.Piston spring assembly 4 is set It is placed in cylinder body 31, piston spring assembly 4 includes big piston assembly 41 and small piston assembly 42.Big piston assembly 41 includes big living Chock plug 411, big piston rod 412 and the reset spring 413 being sheathed on big piston rod have on big piston head 411 one along work The piston hole 4111 that stopper rod length direction opens up.Small piston assembly 42 includes small piston head 421, small piston rod 422 and is arranged In the return spring 423 on small piston rod, small piston rod 422 passes through piston hole 4111, and small piston head 421 blocks piston hole 4111；When the end of small piston assembly 42 moves to work head assembly 100, small piston head 421 opens piston hole 4111, connection The oil pocket of big 412 two sides of piston rod, oil liquid flow into oil return hole 312 through piston hole.

To avoid small piston assembly 42 from being detached from out of piston hole 4111, setting small piston assembly 42 further includes being set to small work Locating part 424 on stopper rod, when small piston head 421 opens piston hole 4111, locating part 424 limits the movement row of small piston rod Journey, return spring 423 are set between small piston head 421 and locating part 424.Specifically, in this present embodiment, small piston rod 422 include first body of rod 4221 and second body of rod 4222 for being set in turn in small piston head, and the diameter of first body of rod 4221 is greater than The diameter of second body of rod 4222, locating part 424 are the nut across second body of rod 4222 and with the locking of first body of rod 4221.When small Piston rod when reverse movement, engages between nut and piston hole 4111, is limited under the action of work head assembly.To prevent Locking nut is slided to second body of rod 4222, in other embodiments, can also be opened up near small piston rod thickness separation One outer conduit, the inside are assembled with a small clip, limit to nut.

In this present embodiment, small piston assembly 42 further includes that 424 other side of locating part is relatively arranged on return spring 423 Cross position protect spring 425.Position protection spring 425 and work head assembly 100 have been served as when contacting, position protection spring 425 has been crossed and is pressed Contracting pushes small piston rod reverse movement by locating part 424, so that small piston head 421 opens piston hole 4111.Cross position guarantor Shield spring 425 makes small piston assembly 42 and the contact of work head assembly 100 be Elastic Contact, and the two has buffering at the time of contact Power, so that the movement of work head assembly 100 is more smoothly.

As shown in Fig. 4 to Fig. 4 B, in this present embodiment, work head assembly 100 is perforating press head assembly.However, this reality This is not limited in any way with novel.In other embodiments, work head assembly be cutting nipper work head, cut expansion pincers work head, Any one of expander work head and bending machine work head.

Perforating press head assembly it include screw shell 101, head body 102 and dynamic punching head 103.Swivel nut cylinder 101 It is sheathed on big piston rod 412.Threaded joints 101 have the annular groove axially extended on the end face of hydraulic device, The side wall of threaded joints 101 is divided into inner sidewall 1011 and lateral wall 1012, inner sidewall 1011 and lateral wall by annular groove 1012 protrude into cylinder body 31 and are located at the inner side and outer side of reset spring 413, and the end of inner sidewall 1011 and small piston are total Protect elasticity 425 opposite at the position of crossing on 42.In the motion process of piston spring assembly 4, touched once crossing position protection elasticity 425 Contact the end of inner sidewall 1011, small piston assembly 42 is inversely mobile, realizes pressure release.For the stream convenient for assembly and piston stroke Freely, in this present embodiment, the length that lateral wall 1012 is arranged is greater than the length of inner sidewall 1011.

In this present embodiment, there is the external screw thread being threadedly coupled with cylinder body 31 on lateral wall 1012.Lateral wall 1012 is in spiral shell There is limited step 1012a on side of the line far from cylinder body 31, when screw shell 101 is threadedly coupled in place with cylinder body 31, limit End of the position step 1012a just with cylinder body 31 offsets.In this present embodiment, it is also set up between screw shell 101 and cylinder body 31 There are O-ring seals, prevents hydraulic cylinder oil leak.In this present embodiment, in assembly, one has been opened up on the medium position of cylinder body 31 Backing-up screw hole is limited in work head assembly in cylinder body 31 by a Screw 104, prevents work head assembly in operation It loosens, rotates.

In this present embodiment, the middle part of head body 102 has a throat 1021 for placing material to be processed, throat 1021 The dynamic punching head mounting hole coaxial with screw shell 101 is offered close to the side of hydraulic device, the other side of throat has quiet Punching seat 1022.Dynamic punching head 103 is installed in dynamic punching head mounting hole, and the end of the big piston rod 412 in hydraulic device is stretched Enter and connects dynamic punching head 103 in punching head mounting hole.There is lightweight groove in head body 101 and it is one left and right Asymmetric Complicated Spatial Structure, the dissymmetrical structure can further decrease the weight of work head assembly.It is examined for security protection Consider, in other embodiments, can also be provided with backplate near quiet punching seat.

In this present embodiment, moving punching head 103 includes interconnecting piece 1031, limiting section 1032 and cutter hub 1033.Interconnecting piece The 1031 cylindrical and abuttings that are connected with the end of big piston rod 412, limiting section 1032 is cylindrical and is arranged in interconnecting piece 1031 sides far from big piston rod 412, the diameter of limiting section 1032 are greater than the diameter of interconnecting piece 1031.The connection limit of cutter hub 1033 Position portion 1032, the end of cutter hub 1033 include being located in the middle sharp tackle mouth 1033a, are formed in sharp tackle mouth two sides dull edge 1033b And the wedge angle 1033c for sharp tackle mouth center.Sharp tackle mouth 1033a and wedge angle 1033c can be rapidly under the action of hydraulic device Steel plate is punched out.

The release of oil liquid is the small piston by being arranged in big piston assembly 41 in hydraulic device provided in this embodiment Assembly 42 is realized.When small piston assembly is not in contact with work head assembly 100, the oil pressure in oil pocket is driven to be continuously increased, it is living Fill in the constantly forward completion punching of main assemblage of spring.When punching is completed the end of small piston assembly 42 just with work head assembly 100 It is in contact, small piston head 421 opens piston hole 4111, and the oil liquid in oil pocket is driven to enter in the oil pocket of the other side simultaneously through piston hole It flows into oil return hole, oil pressure disappears, and big piston rod 412 resets under the action of reset spring 413, and work head assembly is with big piston Bar is retracted, and realizes automatically moving back and forth for work head assembly.The design of small piston assembly 42 and itself and work head assembly 100 it Between cooperation it is very exquisite, entire pressure relief and oil circuit are all very simple, efficiently solve it is hydraulic on the market at present plus Construction equipment detonation or the problems such as oil leak because caused by oil circuit is complicated.

For the safety in utilization for further increasing hydraulic device, in this present embodiment, hydraulic cylinder assembly 3 further includes relief valve 32 and regulating valve 33, cylinder body 31 has on the lateral wall of bottom there are two lug boss 315 radially, has on lug boss 315 There is the radially installed hole of connection driving oil pocket, relief valve 32 and regulating valve 33 are installed in radially installed hole.However, this is practical new Type is not limited in any way this.In other embodiments, hydraulic cylinder assembly 3 can be only comprising one in relief valve or regulating valve It is a.

As shown in Figure 3B, the top of relief valve has a steel ball, when big piston rod forward direction executes and drives oil pocket internal pressure When power is excessively high, oil pressure carries out pressure release by relief valve in driving oil pocket, to reach normal oil pressure level；Another of relief valve Purpose is to realize the slow pressure release of oil pressure, and the intracorporal pressure of cylinder is made to be maintained at setting range while completing high-pressure work It is interior.As shown in Figure 3 C, regulating valve 33 mainly realizes maximum instantaneous oil pressure cntrol, by the pressure for adjusting regulating valve pressure limit spring Clamp force, to reach the setting of different maximum instantaneous oil pressure levels.When oil pressure is greater than the pressing force of limited spring in driving oil pocket When, the taper valve core of regulating valve is jacked up, and corresponding oil pressure is discharged, to reach normal oil pressure level.

In this present embodiment, cylinder body 31 is in hollow tubular, has multiple fuel feed holes 311 and oil return on the bottom of cylinder body 31 Hole 312, the side wall of cylinder body 31 is interior to have the drainback passage 313 for being connected to oil return hole 312, has oil return in the interior side-wall surface of cylinder body Into hole 314, when small piston head 421 opens piston hole 4111, drive oil liquid in oil pocket through piston hole 4111, oil return into hole 314 and drainback passage 313 enter oil return hole 312.However, the utility model is not limited in any way this.In other embodiments In, drainback passage 313 may be provided at the outside of cylinder body.

In this present embodiment, oil return is set to the forward extreme position of big piston assembly 41 into hole 314, and oil return at this time is into hole 314 are connected with the oil pocket of big 41 two sides of piston assembly respectively, the hydraulic oil in the oil pocket of two sides can by oil return into hole 314 into The quick draining of row, improves the speed of draining.

In this present embodiment, the quantity of fuel feed hole 311 is six on cylinder body, and six fuel feed holes form three pairs, respectively with column Three couples of oil outlet a22 on three plunger mounting portion a2 on plug tray a are oppositely arranged.Three pairs of fuel feed holes are evenly distributed on cylinder body In the circumferential direction of bottom, 120 degree are differed between adjacent two pairs, all has a U-shaped counterbore on the position of every a pair of of fuel feed hole, two into Oilhole is provided with the bottom of U-shaped counterbore.U-shaped counterbore can cache the oil outlet a22 oil liquid sprayed, enable oil liquid whole Into in fuel feed hole 311.

To prevent big piston rod from rotating in cylinder body, in this present embodiment, a flat key slot is opened up on big piston rod, Flat key 5 is mounted in flat key slot.A bolt hole has been opened up at the middle part of flat key 5, flat key has been consolidated using a hexagon socket head cap screw It is scheduled in the flat key slot of piston rod.In assembly, flat key 5 is inserted into the guide groove 1023 of head body 102, and big piston rod follows Flat key prevents the circumferential turn of piston spring assembly 4 along the axial movement of guide groove.It further, is the leakage for preventing oil liquid, It is also equipped with U-shaped sealing ring 6 on big piston rod front and work head general assembly position, prevents oil liquid from leaking outside.

As shown in Fig. 6 and Fig. 6 A, in this present embodiment, pump oil component 2 is including plunger tray a, plunger needle bearing b and partially Spindle bearing c, eccentric shaft d, multiple strainer e and multiple plunger f.Plunger tray a is fixedly connected on driving assembly 1, plunger support The center of block a has axis hole a1, and plunger tray a includes multiple plunger mounting portion a2 radially extended, each plunger mounting portion The plunger hole a21 that one radially extends and at least one the axial oil outlet a22 being connected with plunger hole are all had on a2, it is each On the surface of plunger mounting portion a2 with one perpendicular to the axis of plunger hole oil-feed tank a23, oil liquid through oil-feed tank a23 reach column F is filled in, forms arc side channel between two neighboring plunger mounting portion a2, the bottom of arc side channel has oil liquid hole a3.Plunger needle roller Bearing b and eccentric shaft bearing c are installed in axis hole a1, and plunger needle bearing b and eccentric shaft bearing c are out of axis hole a1 in order to prevent Abjection, and plunger needle bearing b end wear is prevented, sliding shim and clip can be mounted in the side plunger needle bearing b. Eccentric shaft d outer-hexagonal end d3 connects the interior hexagonal on DC brushless motor output shaft by ring flange, and the other end is rolled across plunger Needle bearing b is connected with eccentric shaft bearing c.Multiple strainer e are set to oil liquid hole a3.Multiple plunger f difference elastic conjunctions are in column Consent a21 and the circumferential direction for being located at eccentric shaft bearing c drive multiple plunger f along column when eccentric shaft d drives eccentric shaft bearing c rotation Consent a1 is moved back and forth, and plunger f constantly reciprocally passes through oil-feed tank a23, and constantly oil liquid is pumped to hydraulic cylinder side.However, this Utility model is not limited in any way the structure of pump oil component.

In this present embodiment, plunger tray a includes three plunger mounting portion a2 being uniformly distributed circumferentially, each plunger peace There is a pair of axial direction oil outlet a22 on dress portion a2 and be also provided with sealing ring on the position of each oil outlet a22.However, this Utility model is not limited in any way this.

In this present embodiment, the eccentric wheel d1 on eccentric shaft d is an approximate cylindrical body, center and eccentric shaft axis The center for holding c differs a distance, therefore causes eccentric wheel d1 on the center line of eccentric shaft bearing c in dissymmetrical structure point Cloth.The purpose of for stable and anti-attrition, noise reduction, eccentric wheel d1 also sets up fan-shaped balance close to the side of eccentric shaft bearing c Weight d2, positioned opposite with eccentric wheel d1, fan-shaped balance weight d2 is in flat structure and graded profile is presented in its thickness, from root compared with Thick part is reduced to the relatively thin part of outer rim.The setting of fan-shaped balance weight d2 not only ensure that eccentric shaft d and eccentric shaft bearing c Between mass center, center of gravity, bearing axis be overlapped；Another aspect, it is miscellaneous in fan-shaped balance weight d2 cutting dispersion oil liquid under rotation status Matter effect.

In this present embodiment, each plunger f includes plunger barrel f1, plunger spring f2, cunning switch f3 and piston cap f4. Wherein one end of plunger barrel f1 is contacted with the circumferential direction of eccentric shaft bearing c.Wherein one end of plunger spring f2 is connected to plunger barrel f1. Cunning switch f3 is connected to the other end of plunger spring f2, and cunning switch f3 includes latch bracket and cunning switch spring, latch bracket Including a square floor and the mounting post that square floor side is arranged in, four angles of square floor are carried out at rounded corner Reason, round edge section are inscribed plunger hole, have an arc gap on straight section, four oil are formd between arc gap and plunger hole Road, cunning switch spring are set in mounting post.Piston cap f4 is connected to cunning switch spring.

As shown in figure 5, in this present embodiment, driving assembly 1 includes that DC brushless motor 11, ring flange 12 and setting exist The shaft end of the radiating block 13 of motor output end, DC brushless motor 11 is connected with each other by bolt and ring flange 12.Ring flange 12 Four bolts hole 121 have also been opened up close to outer rim position, ring flange 12 and DC brushless motor have been fixed on by four bolts On the plunger tray a of pump oil component.There are four corresponding with the heat release hole on DC brushless motor 11 for the circumferential tool of radiating block 13 Arc groove, DC brushless motor 11 pass through arc groove radiate.

In this present embodiment, as shown in Figure 1, hydraulic device further includes the hand-held part for being connected to 200 lateral wall of hydraulic device 300, the switch button 400 being electrically connected with DC brushless motor is provided on hand-held part 300.

In conclusion hydraulic device provided by the utility model is defeated by oil liquid by setting driving assembly and pump oil component It send to hydraulic cylinder.By the way that piston hole is arranged on the big piston head of piston spring assembly, small piston assembly is mounted on piston hole It is interior.In the initial state, small piston head blocks piston hole, when oil liquid enters driving oil pocket and piston spring assembly is pushed to move ahead When, since work head assembly is extend into cylinder body, the end of small piston assembly can be in contact with work head assembly, small piston assembly Stress is driven in the wrong direction, and piston hole is opened, and the oil liquid in oil pocket is driven to enter in the oil pocket of the other side through piston hole, and oil liquid passes through on cylinder body Oil return hole carries out oil return, and the oil pressure in the oil pocket of two sides disappears, and big piston rod automatically resets under the action of reset spring.This implementation The hydraulic device that example provides realizes the automatic release of oil liquid, total by the way that small piston assembly is arranged in big piston assembly It is very compact and ingenious, as long as small piston assembly and the contact of work head assembly can realize the release of oil liquid, using unusual Safety.

Further, by the way that relief valve or regulating valve are arranged on hydraulic cylinder assembly, when the oil pressure in driving oil pocket is excessively high When, relief valve starting realizes slow pressure release, the intracorporal pressure of cylinder is made to be maintained at setting range while completing high-pressure work It is interior.By the different pressing force of setting regulating valve pressure limit spring, to reach different maximum instantaneous oil pressure level adjustment.When When oil pressure is greater than the pressing force of regulating valve pressure limit spring in driving oil pocket in hydraulic cylinder, the unlatching of regulating valve, release is accordingly Oil pressure, to reach normal oil pressure level.The setting of relief valve or regulating valve can further improve the peace that hydraulic device uses Quan Xing.

Although the utility model is disclosed above by preferred embodiment, it is not intended to limit the utility model, it is any This known those skilled in the art can make some changes and embellishment without departing from the spirit and scope of the utility model, therefore this is practical Novel protection scope is subject to view claims range claimed.

Claims (10)

1. a kind of hydraulic device, which is characterized in that including work head assembly and hydraulic device, the hydraulic device includes:

Driving assembly；

Pump oil component, is connected to the driving component, pumps out oil liquid under the action of driving assembly；

Hydraulic cylinder assembly, including cylinder body, have the fuel feed hole and oil return hole of connection pump oil component on cylinder body, and work head assembly protrudes into In cylinder body；

Piston spring assembly, is set in cylinder body, and the piston spring assembly includes:

Big piston assembly, including big piston head, big piston rod and the reset spring being sheathed on big piston rod, on big piston head The piston hole opened up with one along piston rod length direction；

Small piston assembly is worn including small piston head, small piston rod and the return spring being sheathed on small piston rod, small piston rod Piston hole is crossed, small piston head blocks piston hole；When the end of small piston assembly moves to work head assembly, small piston head is opened Piston hole, is connected to the oil pocket of big piston rod two sides, and oil liquid flows into oil return hole through piston hole.

2. hydraulic device according to claim 1, which is characterized in that the small piston assembly further includes being set to small piston Locating part on bar, when small piston head opens piston hole, locating part limits the movement travel of small piston rod, and return spring is arranged Between small piston head and locating part.

3. hydraulic device according to claim 2, which is characterized in that small piston rod includes being set in turn in small piston head First body of rod and second body of rod, the diameter of first body of rod are greater than the diameter of second body of rod, locating part be across second body of rod and with The nut of first body of rod locking.

4. hydraulic device according to claim 2, which is characterized in that the small piston assembly further includes and return spring phase Spring is protected to the position of crossing for being set to the locating part other side.

5. hydraulic device according to claim 1, which is characterized in that cylinder body is in hollow tubular, is had on the bottom of cylinder body There are multiple fuel feed holes and an oil return hole, there is the drainback passage of connection oil return hole in the side wall of cylinder body, in the interior side-wall surface of cylinder body With oil return into hole, when small piston head opens piston hole, drive oil liquid in oil pocket through piston hole, oil return into hole and oil return Channel enters oil return hole.

6. hydraulic device according to claim 5, which is characterized in that on cylinder body the quantity of fuel feed hole be even number, two into Oilhole forms a pair, and multipair fuel feed hole is evenly distributed in the circumferential direction of cylinder base, all has on the position of every a pair of fuel feed hole One U-shaped counterbore, two fuel feed holes are provided with the bottom of U-shaped counterbore.

7. hydraulic device according to claim 1 or 5, which is characterized in that hydraulic cylinder assembly further includes relief valve or adjusting Valve, cylinder body at least one lug boss radially, have connection driving oil pocket on lug boss on the lateral wall of bottom Radially installed hole, relief valve or regulating valve are installed in radially installed hole.

8. hydraulic device according to claim 1, which is characterized in that the work head assembly is perforating press head assembly, Perforating press head assembly includes:

Head body, middle part have a throat for placing material to be processed, and throat offers dynamic punching close to the side of hydraulic device Hole head mounting hole, the other side of throat have quiet punching seat；

Dynamic punching head, is installed in dynamic punching head mounting hole, and dynamic punching head peace is protruded into the end of the big piston rod in hydraulic device It fills and connects dynamic punching head in hole.

9. hydraulic device according to claim 1 or 8, which is characterized in that big piston assembly further includes flat key, big piston rod It is upper that there is the flat key slot for installing flat key, axially directed slot is offered on work head assembly, flat key is mounted on guiding by fixing piece Slot, big piston rod follow flat key axially movable.

10. hydraulic device according to claim 1, which is characterized in that the work head assembly is cutting nipper work head, cuts Expand any one of pincers work head, expander work head and bending machine work head.