CN208565131U - Hydraulic gear and the hydraulic fast ram machine of servo digital control with it - Google Patents

Abstract

The utility model discloses a kind of hydraulic gear and with its hydraulic fast ram machine of servo digital control, including pedestal, hydraulic cylinder and toggle mechanism, during punch forming, hydraulic oil is inputted quick chamber by oil pump, is quickly stretched out in displacement range when driving piston rod just to stretch the plate to be punched of lower die to the upper mold loaded on slide unit from the position being opened completely；Then oil pump is by hydraulic oil through inputting pressurizing chamber, and quickly to increase the thrust output of piston rod, and the plate to be punched for making piston rod just stretch lower die in upper mold extremely will stretch out at a slow speed the stage that plate to be punched is completely stretched；When piston rod i.e. will be fully extended, spool is moved to piston rod and offsets with the inside bottom wall of cylinder body, spool overcomes the elastic force of top spring to move up and open pressure relief vent under the drag effect of the inside bottom wall of cylinder body, the hydraulic oil in pressurizing chamber is set to flow into pressure-releasing cavity, with the fast automatic thrust reduced to piston rod, electrical and hydraulic system the release time is saved, ram efficiency is improved.

Description

Hydraulic gear and the hydraulic fast ram machine of servo digital control with it

Technical field

The utility model relates to stamping technology field, in particular to a kind of hydraulic gear and the servo digital control with it Hydraulic fast ram machine.

Background technique

Hydraulic cylinder is the executive component in Hydraulic Power Transmission System, it is the energy converting means for hydraulic energy being converted into mechanical energy It sets.Have the characteristics that structure is simple, reliable operation, when realizing straight reciprocating motion, deceleration device can be removed from, and do not have with it There is drive gap, movement is steady, and high transmission accuracy, therefore is used widely in the hydraulic system of various machinery.

But existing hydraulic cylinder is influenced by the slower factor of the switching of output speed value and thrust magnitude, use scope by Limitation has been arrived, for example, for press machine, it is required that upper mold can be driven in vertical difference during open mold Regional scope provides different speed and thrust for upper mold, and existing hydraulic cylinder by output speed value and thrust magnitude switching compared with Slow factor influences, and takes a long time to realize the requirement, has seriously affected ram efficiency and (be only able to achieve within general one minute Open mold ten times or so).

Thus, existing press machine mainly uses motor-driven mode, i.e., is moved by motor drive flywheel, and lead to Clutch is crossed, transmission gear drives crank link mechanism that sliding block is made to move up and down, and then drives upper mold lifting, so that upper mold is under The punch forming to sheet metal is realized in mould cooperation.It, need to be using flywheel, deceleration device etc. but using motor-driven mode Mechanism can make press machine structure is complicated to change, in addition, that there are drive gaps is relatively large, movement steady for this kind of drive The relatively low problem of property, corresponding transmission accuracy and forming quality of products are lower.

Utility model content

The main purpose of the utility model be propose a kind of hydraulic gear and with its servo digital control it is hydraulic quickly Press machine, it is intended to which transmission accuracy simultaneously improves ram efficiency.

To achieve the above object, the utility model proposes a kind of hydraulic gears, comprising:

Pedestal；

Hydraulic cylinder, the hydraulic cylinder is loaded on pedestal, including cylinder body, interior bar and piston rod, and the hollow formation of cylinder interior is held Receive space；Interior bar and cylinder body are connected, and accommodation space is stretched out on the top of interior bar, and it is close that first is equipped at interior bar and the mating surface of cylinder body Seal structure；Piston rod defines open-topped cavity, and piston rod movable set is in interior bar and can move axially along interior bar, piston Second seals structure is housed, the lower end of interior bar is equipped with third sealing structure to separate cavity up and down at the mating surface of bar and interior bar At backhaul chamber and quick chamber, the periphery wall of piston rod is equipped with the 4th sealing structure with by the clearance space between piston rod and cylinder body It is separated into pressurizing chamber and pressure-releasing cavity up and down, cylinder body is stretched out in the lower part of piston rod, and the is equipped at the mating surface of cylinder body and piston rod Five sealing structures, the part that piston rod stretches out cylinder body offers the express passway for leading to quick chamber to connect rapid liquid inlet pipe, interior The part that bar is located at outside cylinder body offers the return pass for leading to backhaul chamber to connect backhaul inlet tube, and outer wall of cylinder block offers logical Even for the discharge channel of pressure-releasing cavity to connect release outlet tube, the position that cylinder body corresponds to pressurizing chamber offers the pressurization for leading to pressurizing chamber To connect pressurization inlet tube, the piston rod is also provided with the adapter cavity for leading to pressurizing chamber and leads to adapter cavity and release in channel The pressure relief vent of chamber has spool and top spring in adapter cavity, and the top of spool is offseted by pushing up the roof elasticity of spring and adapter cavity, lower part Across pressure relief vent and pressure-releasing cavity is protruded into, when piston rod is not fully extended, spool seals pressure relief vent under the elastic force effect of top spring It closes, when piston rod i.e. will be fully extended, spool overcomes the elastic force of top spring upward under the drag effect of the inside bottom wall of cylinder body Movement simultaneously opens pressure relief vent；And

Toggle mechanism, loaded on being connected on pedestal and with the piston rod, the free end of toggle mechanism connects the toggle mechanism Be connected to slide unit, when piston rod stretches, can drive toggle mechanism driving slide unit straight reciprocating motion and by piston rod export thrust Amplification.

The utility model also proposes a kind of hydraulic fast ram machine of servo digital control, including rack and hydraulic gear, The hydraulic gear is above-mentioned hydraulic gear.

Piston rod is set in the part that interior bar is located in the accommodation space of cylinder body by technical solutions of the utility model, in interior bar Lower end installation third sealing structure with will the cavity of piston rod up and down be separated into backhaul chamber and quick chamber, in the outer wall of piston rod Equipped with the 4th sealing structure the clearance space between piston rod and cylinder body is separated into pressurizing chamber and pressure-releasing cavity up and down, leading to The adapter cavity and pressure relief vent of pressurizing chamber and pressure-releasing cavity dress installation spool and top spring, and toggle mechanism is connected with piston rod.Punching press During molding, servo-control system control oil pump is first passed through by the hydraulic oil with first pressure through rapid liquid inlet pipe and fast Fast channel inputs quick chamber, with drive piston rod from the position being opened completely to the upper mold loaded on slide unit just stretched lower die wait rush Quickly stretched out in displacement range when pressing plate material (it should be noted that in this displacement range, resistance that piston rod is subject to without or Person is smaller, is suitble to use higher stretching speed)；Then, servo-control system control oil pump will be with the hydraulic of second pressure The pressurized channel of oil and pressurization inlet tube input pressurizing chamber, quickly to increase the thrust output of piston rod, and make piston rod upper The plate to be punched that mould has just stretched lower die, which extremely will stretch out at a slow speed the stage that plate to be punched is completely stretched, (should illustrate It is that piston rod is by biggish resistance in this stage, it is desirable that piston rod is overhanging at a slow speed and exports biggish thrust)；And then, When piston rod i.e. will be fully extended, spool is moved to piston rod and offsets with the inside bottom wall of cylinder body, and spool is in cylinder body Overcome the elastic force of top spring to move up and open pressure relief vent under the drag effect of side bottom wall, makes that there is second pressure in pressurizing chamber Hydraulic oil flow into pressure-releasing cavity through adapter cavity and pressure relief vent, with the fast automatic thrust reduced to piston rod, save electrical and liquid The release time of pressure system molds upper die and lower die completely (it should be noted that this stage until piston rod is fully extended It is suitble to need to reduce thrust, prevents from overloading).Obviously, the utility model can increase substantially cutting for output speed value and thrust magnitude Efficiency is changed, the ram efficiency (being able to achieve open mold for general one minute about 40 times) of press machine can be improved.And press machine can be simplified Structure, and improve corresponding transmission accuracy.

Detailed description of the invention

Fig. 1 is the stereoscopic schematic diagram of the utility model hydraulic gear；

Fig. 2 is the main view of the utility model hydraulic gear；

Fig. 3 is the schematic diagram of the utility model press machine；

Fig. 4 is the cross-sectional view of hydraulic cylinder and pedestal；

Fig. 5 is the enlarged detail view of the part A of Fig. 4；

Fig. 6 is the schematic diagram of piston rod；

Fig. 7 is the schematic diagram of interior bar.

Specific embodiment

Below in conjunction with attached drawing, the technical scheme in the utility model embodiment is clearly and completely described, shows So, described embodiment is only a part of the embodiment of the utility model, instead of all the embodiments.It is practical based on this Embodiment in novel, every other reality obtained by those of ordinary skill in the art without making creative efforts Example is applied, is fallen within the protection scope of the utility model.

It is to be appreciated that if related in the utility model embodiment directionality instruction (such as up, down, left, right, before and after, Top, bottom, inside and outside, vertical, transverse direction, longitudinal direction, counterclockwise, clockwise, circumferentially, radially, axially ...), then directionality indicates only For explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if When the particular pose changes, then directionality instruction also correspondingly changes correspondingly.

In addition, if relating to the description of " first " or " second " etc. in the utility model embodiment, should " first " or The description of person " second " etc. is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated The quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can explicitly or implicitly include to Few this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be common with this field Based on technical staff can be realized, this skill will be understood that when the combination of technical solution appearance is conflicting or cannot achieve The combination of art scheme is not present, also not within the protection scope of the requires of the utility model.

The utility model proposes a kind of hydraulic gears.

In the utility model embodiment, as shown in Fig. 1 to 7, which includes pedestal 100, hydraulic cylinder and toggle mechanism 4。

Wherein, the rack 200 that pedestal 100 is fixedly arranged on press machine is located at the position above lower die (not shown).

Hydraulic cylinder includes cylinder body 1, interior bar 2 and piston rod 3, and 1 inner hollow of cylinder body forms accommodation space.The interior bar 2 with Cylinder body 1 is connected, and accommodation space is stretched out on the top of interior bar 2, and the first sealing structure 21 is equipped at interior bar 2 and the mating surface of cylinder body 1. Piston rod 3 defines open-topped cavity, and 3 movable set of piston rod is in interior bar 2 and axial (or upper and lower) can move along interior bar 2 It is dynamic, second seals structure 31 is housed at the mating surface of piston rod 3 and interior bar 2, the lower end of interior bar 2 equipped with third sealing structure 22 with Cavity is separated into backhaul chamber 32 and quick chamber 33 up and down, the periphery wall of piston rod 3 is equipped with the 4th sealing structure 34 with by piston Clearance space between bar 3 and cylinder body 1 is separated into pressurizing chamber 35 and pressure-releasing cavity 36 up and down, and cylinder body 1 is stretched out in the lower part of piston rod 3, And the 5th sealing structure 111 is equipped at the mating surface of cylinder body 1 and piston rod 3, the part that piston rod 3 stretches out cylinder body 1 offers logical Even to connect rapid liquid inlet pipe (not shown), the part that interior bar 2 is located at outside cylinder body 1 offers logical the express passway 37 of quick chamber 33 For the return pass 23 of the journey that is linked back chamber 32 to connect backhaul inlet tube (not shown), 1 outer wall of cylinder body, which offers, leads to pressure-releasing cavity 36 To connect release outlet tube (not shown), the position of the corresponding pressurizing chamber 35 of cylinder body 1 offers to lead to be added discharge channel (not shown) The pressurization passageway 12 of chamber 35 is pressed to pressurize inlet tube (not shown) to connect, the piston rod 3, which is also provided with, leads to pressurizing chamber 35 Adapter cavity 38 and the pressure relief vent 381 for leading to adapter cavity 38 and pressure-releasing cavity 36 have spool 5 and top spring 51, spool 5 in adapter cavity 38 Top offseted by top spring 51 and the roof elasticity of adapter cavity 38, work is worked as across pressure relief vent 381 and pressure-releasing cavity 36 is protruded into lower part When stopper rod 3 is not fully extended, spool 5 closes pressure relief vent 381 under the elastic force effect of top spring 51, when piston rod 3 will be complete When stretching, spool 5 overcomes the elastic force of top spring 51 to move up and by pressure relief vent under the drag effect of the inside bottom wall of cylinder body 1 381 open.

For toggle mechanism 4 loaded on being connected on pedestal and with the piston rod, the free end of toggle mechanism 4 is connected with slide unit 6, sliding Platform 6 vertical can be slidably mounted in rack 200, and slide unit 6 can be used for installing upper mold, when piston rod 3 stretches, can drive toggle mechanism 4 driving slide units 6 drive upper mold straight reciprocating motion and the thrust for exporting piston rod 3 is amplified.

During punch forming (such as blanking, shearing, punching or drawing and forming), servo-control system control is first passed through Hydraulic oil with first pressure is inputted quick chamber 33 through rapid liquid inlet pipe and express passway by liquefaction pump, to drive piston rod 3 Position when just having stretched plate to be punched (not shown) of lower die (not shown) to the upper mold loaded on slide unit 6 from the position being opened completely Move in range and quickly stretch out (it should be noted that in this displacement range, resistance that piston rod 3 is subject to without or it is smaller, be suitble to Using higher stretching speed)；Then, servo-control system control oil pump is by the pressurized channel of hydraulic oil with second pressure Pressurizing chamber is inputted with pressurization inlet tube, quickly to increase the thrust output of piston rod 3, and makes piston rod 3 in the case where upper mold just stretches The stage that plate to be punched will be extremely completely stretched by the plate to be punched of mould stretches out at a slow speed (it should be noted that in this stage Middle piston rod 3 is by biggish resistance, it is desirable that piston rod is overhanging at a slow speed and exports biggish thrust)；And then, in piston rod 3 When i.e. will be fully extended, spool be moved to piston rod 3 and offsets with the inside bottom wall of cylinder body, inside bottom wall of the spool in cylinder body Overcome the elastic force of top spring to move up and open pressure relief vent under drag effect, makes the hydraulic oil in pressurizing chamber with second pressure Pressure-releasing cavity is flowed into through adapter cavity and pressure relief vent, with the fast automatic thrust reduced to piston rod 3, is saved electrical and hydraulic system The release time molds upper die and lower die completely (it should be noted that this stage is suitble to need until piston rod 3 is fully extended Thrust is reduced, prevents from overloading).Obviously, the utility model can increase substantially the switching efficiency of output speed value and thrust magnitude, can Improve the ram efficiency (being able to achieve open mold for general one minute about 40 times) of press machine.And the structure of press machine can be simplified, and Improve corresponding transmission accuracy.And when needing to shrink piston rod 3, then it can control oil pump to pass through back the hydraulic oil with third pressure Cheng Tongdao and backhaul inlet tube input backhaul chamber simultaneously push piston rod 3 to shrink, and the hydraulic oil of pressurizing chamber 35 and quick chamber 33 is then Fuel tank is flowed back to, until piston rod 3 is shunk in place.

(do not scheme it should be noted that the arrival end of express passway 37 is equipped with the first connector 39 and is equipped with the first hydraulic valve Show), the entrance of the first hydraulic valve connects oil pump by the rapid liquid inlet pipe, and outlet connects fuel tank (not shown) by oil pipe, The arrival end of return pass 23 is equipped with the second connector 24 and is equipped with the second hydraulic valve (not shown), and the entrance of the second hydraulic valve is logical The backhaul inlet tube connection oil pump is crossed, outlet connects fuel tank (not shown) by oil pipe；The arrival end of pressurization passageway 12 is equipped with Third connector 13 is simultaneously equipped with third hydraulic valve (not shown), the entrance of the third liquid valve pressurization inlet tube (not shown) logically Lead to oil pump, outlet connects fuel tank (not shown) by oil pipe, the first hydraulic valve, the second hydraulic valve and third hydraulic valve and servo Control system electrical connection, and can by servo-control system switching direction, for example, piston rod 3 stretch out during, backhaul chamber Hydraulic oil can only flow out and cannot flow into, pressurizing chamber 35 and quick chamber 33 then cannot only flow out for hydraulic oil inflow, in work During stopper rod 3 is shunk, then on the contrary.

In the utility model embodiment, there are many embodiments for toggle mechanism 4, in a preferred embodiment, the piston The part that bar 3 is located at outside cylinder body 1 is connected with free bearing 6, and the toggle mechanism 4 includes at least row's wrist 41(as shown in Figure 2 For two rows of situations, two rows of wrists are symmetrical arranged, it is of course also possible to for three rows, four rows etc.), every row's wrist is at least There are a wrist (three situations being illustrated in figure 2, it is of course also possible to for two, four or more), each toggle Component 41 includes drive rod 413, output rod 412 and swing rod 411, and the upper end of every swing rod 411 and pedestal are pivotally connected (or hinged), Lower end is pivotally connected with the upper end of corresponding output rod 412, and the lower end of output rod 412 and slide unit 6 are pivotally connected, and the one of every drive rod 413 End is pivotally connected with free bearing 6, and the other end is pivotally connected with corresponding output rod 412, when piston rod stretches, can drive pendulum by drive rod 413 Bar 411 and output rod 412 are swung, when swing rod 411 and output rod 412 are rocked to and are generally in same straight line (i.e. at toggle mechanism 4 In substantially straight configuration) when, the thrust of piston rod can significantly be amplified (such as 20 times of amplification) by toggle mechanism 4, and make upper mold It is molded completely with lower die, and plays pressure maintaining and protection mold, it should be noted that when upper die and lower die mold completely, Although pressure-releasing cavity is shed the pressure of the hydraulic oil of pressurizing chamber 35, the hydraulic oil of quick chamber 33 acts on piston rod and generates Thrust through in straight configuration toggle mechanism 4 significantly amplify after, the pressure maintaining of fully sufficient product to be formed in a mold Sizing.Certainly, toggle mechanism 4 can also use the prior art, be not discussed here.

Specifically, cylinder body 1 includes shell 10 and guide sleeve 11, and the receiving that the shell 10 defines bottom-open is empty Between, guide sleeve 11 is loaded at the open bottom of shell 10, and is placed on piston rod 3, the internal perisporium of guide sleeve 11 and the mating surface of piston rod 3 Place is set at the periphery wall of guide sleeve 11 and the mating surface of cylinder body 1 equipped with the 5th sealing structure 111 with preventing hydraulic oil from leaking outside There is the 6th sealing structure 112, to prevent hydraulic oil from leaking outside.Further, radial overhanging flange is arranged at the bottom of the shell 10 101, the flange 101 offers screw via hole, shell 10 to be fastened on pedestal 100 by screw, to carry out to cylinder body 1 Positioning.

Specifically, the interior bar 2 step shaft-like big in the small lower section of upper section, step surface are butted on the inside roof of cylinder body 1, Upper section stretches out shell 10 from the via hole for being opened in 1 roof of cylinder body, and the periphery wall that upper section stretches out the part of cylinder body 1 forms screw thread, There is nut 8 to be rotatably connected in upper section and offset with the outside roof of cylinder body 1, interior bar 2 is fastened at cylinder body 1.

Specifically, the piston rod 3 includes main body 30 and body 301, and the main body 30 defines open-topped institute Cavity is stated, the body 301 is loaded on top open part, and activity is placed on interior bar 2, the internal perisporium of body 301 and the cooperation of interior bar 2 The second seals structure 31 is housed, to seal, the periphery wall of the body 301 and the mating surface of main body 30 are filled at face There is the 7th sealing structure 310, to seal.

Further, the position of the corresponding pressurizing chamber 35 of the cylinder body 1 offers the repairing hole 14 for leading to pressurizing chamber 35, repairing Hole 14 is connect by hydraulic valve 7 and oil pipe (not shown) with slippage pump (not shown), when the first pressure that has of quick chamber 33 During hydraulic oil drives piston rod 3 to stretch out, the space of pressurizing chamber 35 be will increase, and just need here through slippage pump through hydraulic Valve 7 and repairing pipe are toward the supplement hydraulic oil of pressurizing chamber 35, so that the hydraulic oil in pressurizing chamber 35 remains full of pressurizing chamber 35, otherwise, During the subsequent past input of pressurizing chamber 35 has the hydraulic oil of second pressure, it is also necessary to first with hydraulic with second pressure Oil is full of the process of pressurizing chamber 35, and this will affect working efficiency.

Specifically, third sealing structure 22 includes fixed (preferably by being threadedly engaged the pullover being screwed on) in 2 lower end of interior bar 221 and sealing element 222, the sealing element 222 is loaded on the periphery wall of pullover 221.More specifically, sealing element includes at least one The periphery wall of rubber ring, pullover 221 slots and installs the rubber ring.

Specifically, as shown in fig. 6, the arrival end of express passway 37 is set to the periphery that piston rod 3 is located at the part outside cylinder body 1 Wall or bottom wall, and extend to and be connected to the cavity.

Specifically, as shown in fig. 7, the arrival end of the return pass 23 is preferably opened in the roof of interior bar 2, outlet end is opened It is connected to set on its side wall and with backhaul chamber 32.

Specifically, first sealing structure 21, the 4th sealing structure 34 of second seals structure 31, the 5th sealing structure 111, the 6th sealing structure 112, the 7th sealing structure 310 may each comprise at least one rubber ring (such as one, two, three It is a or more), the mode of fluting installation equally can be used in mounting means.

It should be noted that the first pressure, the second pressure and the third pressure can as needed depending on, example Such as, second pressure is preferably greater than first pressure.

It should be noted that when there is the hydraulic oil of first pressure toward the input of quick chamber 33, it is when defeated toward pressurizing chamber 35 Enter hydraulic oil with second pressure and when toward the input of backhaul chamber 32 have third pressure hydraulic oil can by setting with The sensor of servo-control system electrical connection, and realize specifically how to be arranged by sensor sensing upper mold movement position, this The technical staff in field, that is, it is contemplated that how to be arranged, is not discussed here after seeing the content that this specification is recorded.

As shown in Figures 1 to 7, the utility model also propose a kind of hydraulic fast ram machine of servo digital control, including rack with And hydraulic gear, the structure of the hydraulic gear are equipped with upper die and lower die in rack, due to watching referring to above-described embodiment It takes numerical control hydraulic fast ram machine and uses whole technical solutions of all embodiments of above-mentioned hydraulic gear, therefore at least have There are all beneficial effects brought by the technical solution of above-described embodiment, this is no longer going to repeat them.

The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, It is all under the design of the utility model, equivalent structure transformation made based on the specification and figures of the utility model, or Directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. hydraulic gear characterized by comprising

Pedestal；

Hydraulic cylinder, the hydraulic cylinder is loaded on pedestal, including cylinder body, interior bar and piston rod, and the hollow formation of cylinder interior accommodates empty Between；Interior bar and cylinder body are connected, and accommodation space is stretched out on the top of interior bar, and the first sealing knot is equipped at interior bar and the mating surface of cylinder body Structure；Piston rod defines open-topped cavity, and piston rod movable set is in interior bar and can move axially along interior bar, piston rod and Second seals structure is housed, the lower end of interior bar is equipped with third sealing structure cavity to be separated into back up and down at the mating surface of interior bar Journey chamber and quick chamber, the periphery wall of piston rod are equipped with the 4th sealing structure with will be above and below the clearance space between piston rod and cylinder body It is separated into pressurizing chamber and pressure-releasing cavity, cylinder body is stretched out in the lower part of piston rod, and it is close that the 5th is equipped at the mating surface of cylinder body and piston rod Seal structure, the part that piston rod stretches out cylinder body offer the express passway for leading to quick chamber to connect rapid liquid inlet pipe, interior bar position The return pass for leading to backhaul chamber is offered in the part outside cylinder body to connect backhaul inlet tube, outer wall of cylinder block is offered to lead to and be unloaded Press the discharge channel of chamber to connect release outlet tube, the position that cylinder body corresponds to pressurizing chamber offers the pressurization passageway for leading to pressurizing chamber It is pressurizeed inlet tube with connection, the piston rod is also provided with the adapter cavity for leading to pressurizing chamber and leads to adapter cavity and pressure-releasing cavity Pressure relief vent has spool and top spring in adapter cavity, and the top of spool is offseted by pushing up the roof elasticity of spring and adapter cavity, and lower part passes through Pressure relief vent simultaneously protrudes into pressure-releasing cavity, and when piston rod is not fully extended, spool closes pressure relief vent under the elastic force effect of top spring, when When piston rod i.e. will be fully extended, spool overcomes the elastic force of top spring to move up simultaneously under the drag effect of the inside bottom wall of cylinder body Pressure relief vent is opened；And

Toggle mechanism, loaded on being connected on pedestal and with the piston rod, the free end of toggle mechanism is connected with the toggle mechanism Slide unit when piston rod stretches, can drive toggle mechanism driving slide unit straight reciprocating motion and amplify the thrust of piston rod output.

2. hydraulic gear as described in claim 1, it is characterised in that: the arrival end of express passway is equipped with the first connector simultaneously First hydraulic valve is installed, the entrance of the first hydraulic valve connects oil pump by the rapid liquid inlet pipe, and outlet is connected by oil pipe The arrival end of fuel tank, return pass is equipped with the second connector and is equipped with the second hydraulic valve, and the entrance of the second hydraulic valve passes through described Backhaul inlet tube connects oil pump, and outlet connects fuel tank by oil pipe；The arrival end of pressurization passageway is equipped with third connector and is equipped with Third hydraulic valve, the pressurization inlet tube leads to oil pump to the entrance of third liquid valve logically, and outlet is by oil pipe connection fuel tank, and first Hydraulic valve, the second hydraulic valve and third hydraulic valve are electrically connected with servo-control system.

3. hydraulic gear as described in claim 1, it is characterised in that: cylinder body includes shell and guide sleeve, the shell The accommodation space of bottom-open is defined, guide sleeve is loaded at the open bottom of shell, and is placed on piston rod, the inner circumferential of guide sleeve 5th sealing structure is housed at the mating surface of wall and piston rod, is equipped with the 6th at the periphery wall of guide sleeve and the mating surface of cylinder body Sealing structure.

4. hydraulic gear as claimed in claim 3, it is characterised in that: radial overhanging flange, institute are arranged at the bottom of shell It states flange and offers screw via hole, shell is fastened on pedestal by screw.

5. hydraulic gear as described in claim 1, it is characterised in that: the interior bar step shaft-like big in the small lower section of upper section, Its step surface is butted on the inside roof of cylinder body, and upper section stretches out shell from the via hole for being opened in cylinder body roof, and upper section stretches out cylinder body Partial periphery wall forms screw thread, has nut to be rotatably connected in upper section and offset with the outside roof of cylinder body.

6. hydraulic gear as described in claim 1, it is characterised in that: piston rod includes main body and body, the master Body defines the open-topped cavity, and the body is loaded on top open part, and activity is placed on interior bar, the internal perisporium of body It is tied equipped with the second seals structure, the periphery wall of body and the mating surface of main body equipped with the 7th sealing at the mating surface of interior bar Structure.

7. hydraulic gear as described in claim 1, it is characterised in that: third sealing structure includes being fixedly arranged on interior bar lower end Pullover and sealing element, the sealing element is loaded on the periphery wall of pullover, and sealing element includes at least one rubber ring, pullover it is outer Peripheral wall slots and installs the rubber ring.

8. hydraulic gear as described in claim 1, it is characterised in that: the position that cylinder body corresponds to pressurizing chamber, which offers, leads to The repairing hole of pressurizing chamber, repairing hole are connect by hydraulic valve and oil pipe with slippage pump.

9. hydraulic cylinder as claimed in any of claims 1 to 8 in one of claims, it is characterised in that: piston rod is located at the part outside cylinder body It is connected with free bearing, toggle mechanism includes at least row's wrist, every at least one wrist of row's wrist, each elbow Section component includes drive rod, output rod and swing rod, and the upper end of every swing rod and pedestal are pivotally connected, and lower end is upper with corresponding output rod End pivot joint, the lower end of output rod and slide unit are pivotally connected, and one end of every drive rod and free bearing are pivotally connected, the other end and corresponding output rod Pivot joint when piston rod stretches, can drive swing rod and output rod to swing, when swing rod and output rod are rocked to and substantially locate by drive rod When same straight line, toggle mechanism can significantly amplify the thrust of piston rod, and mold upper die and lower die completely.

10. the hydraulic fast ram machine of servo digital control, it is characterised in that: including rack and such as any one of claim 1 to 9 The hydraulic gear.