CN208853504U - A kind of servo locking mechanism, buffer unit and punching machine - Google Patents

Abstract

The utility model discloses a kind of servo locking mechanisms, comprising: oil-hydraulic cylinder, valve rod, fuel feeding assembly and servo valve, wherein valve rod is movably arranged in the oil-hydraulic cylinder；Fuel feeding assembly includes one to store the oil drum of second hydraulic oil, one be set to the oil drum and the servopump connecting with second petroleum pipeline and the servo motor that connect with the servopump；Servo valve has a port, an oil inlet and an oil discharge outlet, which is connected by the first petroleum pipeline with the oil-hydraulic cylinder, which is connected by the second petroleum pipeline with the fuel feeding assembly.The utility model additionally provides buffer unit and punching machine with the servo locking mechanism, by the design of the servo valve and fuel feeding assembly of servo locking mechanism, can control the speed of die-cushion sliding block rising to reduce power when its collision board and the noise of generation.

Description

A kind of servo locking mechanism, buffer unit and punching machine

Technical field

The utility model relates to technical field of industrial equipment, a kind of servo locking mechanism, buffering dress are particularly related to It sets and punching machine.

Background technique

Refering to fig. 1, the formed punch 12, one that existing punching machine 1 is set to board 11 comprising a board 11, one is set to 12 bottom of formed punch The upper mold 13, one at end is located at interval at the lower mold 14 and a buffer unit 15 of 13 lower section of upper mold.Buffer unit 15 includes one Die-cushion sliding block 151, the more mandrils for being set to 151 top of die-cushion sliding block and being arranged in lower mold 14 positioned at lower 14 lower section of mold 152, carrier 153, two for being located at the lower section of die-cushion sliding block 151 be set between carrier 153 and die-cushion sliding block 151 to The mobile driving cylinder 154, one of driving die-cushion sliding block 151 is set to the fuel tank 155 of 153 bottom end of carrier, a cushion dashpot 156, An and control module 157.155 internal reservoir of fuel tank has hydraulic oil 150.

Cushion dashpot 156 has a cylinder body 158, a piston rod 159 and a piston 160.Cylinder body 158 is set to fuel tank 155 It is interior.Piston rod 159 is arranged in carrier 153 and cylinder body 158 and top is fixedly connected to die-cushion sliding block 151.Piston 160 is arranged In in cylinder body 158 and set be fixed in piston rod 159.Cylinder body 158 defines a upper chamber 161, Ji Yiwei for being located at 160 top of piston Lower oil chamber 162 in 160 lower section of piston.Control module 157 includes that a cylinder body 163, one for being set to 155 side of fuel tank is set to Valve rod 164, a solenoid valve 165, a gas receiver 166 and a pneumatic supply 167 in cylinder body 163.Cylinder body 163 defines a connection Runner 168 between upper chamber 161 and fuel tank 155 to circulate for hydraulic oil 150.Valve rod 164 is to control runner 168 Circulation blocks.

When die-cushion sliding block 151 and piston 160 distinguish a position lower dead point position shown in Fig. 1, solenoid valve 165 is switched to One air-suction state.At this point, the produced air pressure of pneumatic supply 167, which will drive the gas in gas receiver 166, flows into cylinder via solenoid valve 165 In body 163 and valve rod 164 is pushed to be moved to the blocking position of a blocking runner 168.Due to the hydraulic oil 150 in upper chamber 161 Can not be via runner 168 toward downstream in fuel tank 155, therefore, die-cushion sliding block 151 can be located in lower dead point position.

Referring to Fig.2, solenoid valve 165 is switched to an exhaust condition, is made in cylinder body 163 when die-cushion sliding block 151 to be made rises Gas can be emitted into outside via solenoid valve 165, with band ovable valve stem 164 be moved to a non-obstructing position shown in Fig. 2.Through Two driving cylinders 154 driving die-cushion sliding blocks 151 up move, and die-cushion sliding block 151 up can penetrate piston rod in moving process For 159 band pistons 160 toward moving up, piston 160, which can squeeze the hydraulic oil 150 in upper chamber 161, makes it via runner 168 to flowing down To fuel tank 155.It just can not be further continued for moving up when 151 top of die-cushion sliding block collides a stop part 111 of board 11, at this time Die-cushion sliding block 151 in a upper dead center position, and a workpiece 17 is lifted off lower mold 14 by mandril 152.Due on die-cushion sliding block 151 The speed risen is to be back to fuel tank by manually adjusting the control hydraulic oil 150 of flow control valve 169 that one is arranged on runner 168 155 and lower oil chamber 162 in flow, it is hydraulic to adjust flow control valve 169 can not to be adjusted in 151 uphill process of die-cushion sliding block Oily 150 flows and then the rate of climb for changing die-cushion sliding block 151, therefore, die-cushion sliding block 151 is up pushed away and is touched by cylinder 154 When bumping against stop part 111 very big noise can be generated because colliding power greatly.Since die-cushion sliding block 151 is in long-time use process In can be driven by cylinder 154 and be continually colliding stop part 111, therefore, it is very easy to cause die-cushion sliding block 151 and stop part 111 It is impaired to cause service life to reduce in turn.

Refering to fig. 1 and Fig. 2, since workpiece 17 is shored fixation position shown in Fig. 2 by mandril 152, when formed punch 12 Upper mold 13 is driven to move down and when contact workpiece 17, the impact force of 13 moment impact workpiece 17 of upper mold is very big, and impacts When generated noise it is also big.Since upper mold 13 understands continuous Ground shock waves position in the work of fixed position in long-time use process Part 17, therefore, it is very easy to which upper mold 13 and lower mold 14 is caused to be damaged and then die life is caused to reduce.

Therefore, the inventor of the utility model needs to conceive a kind of new technology to improve its problem.

Utility model content

The utility model is intended to provide a kind of servo locking mechanism, buffer unit and punching machine.

The technical solution of the utility model is:

A kind of servo locking mechanism, comprising: oil-hydraulic cylinder, valve rod, fuel feeding assembly and servo valve, wherein valve rod is removable Ground is set in the oil-hydraulic cylinder；Fuel feeding assembly includes one to store the oil drum of second hydraulic oil, one be set to the oil drum simultaneously The servo motor that the servopump and one connecting with second petroleum pipeline are connect with the servopump；Servo valve have a port, one into Hydraulic fluid port and an oil discharge outlet, the port are connected by the first petroleum pipeline with the oil-hydraulic cylinder, which passes through the second petroleum pipeline It is connected with the fuel feeding assembly.

Preferably, servo valve is the oil pressure servo valve of position closed circuit type in one or four mouthfuls three.

A kind of buffer unit, comprising: a servo locking mechanism, the servo locking mechanism are servo described above Locking mechanism.

Preferably, further includes:

One carrier；

One driving mechanism is set on the carrier；

One die-cushion sliding block, the merging that connects with the driving mechanism can be driven by it and be moved；

One fuel tank is set to the carrier and stores one first hydraulic oil；

One cushion dashpot, including a buffering cylinder body, a piston rod and a piston, the cushion dashpot body are located at below the carrier, The piston rod can be arranged in the carrier and the buffering cylinder body up or down and be fixedly connected to the die-cushion sliding block, the piston It is set in the cushion dashpot body and set is fixed in the piston rod, which defines a upper chamber being located above the piston, and One is located at the lower oil chamber being connected below the piston and with the fuel tank.

Preferably, servo valve is the oil pressure servo valve of position closed circuit type in one or four mouthfuls three.

A kind of punching machine a, comprising: buffer unit, the buffer unit are buffer unit described above.

Preferably, further includes: a board, a formed punch, a upper mold, once mold, wherein board includes a pedestal and one Stop part, stop part are set to a top surface of pedestal；Upper mold is set to formed punch bottom end；Lower mold is set to the pedestal of board Top surface.

Preferably, the buffer unit further include:

One carrier；

One driving mechanism is set on the carrier；

One die-cushion sliding block, the merging that connects with the driving mechanism can be driven by it and be moved；

One fuel tank is set to the carrier and stores one first hydraulic oil；

One cushion dashpot, including a buffering cylinder body, a piston rod and a piston, the cushion dashpot body are located at below the carrier, The piston rod can be arranged in the carrier and the buffering cylinder body up or down and be fixedly connected to the die-cushion sliding block, the piston It is set in the cushion dashpot body and set is fixed in the piston rod, which defines a upper chamber being located above the piston, and One is located at the lower oil chamber being connected below the piston and with the fuel tank.

By adopting the above technical scheme, the utility model include at least it is following the utility model has the advantages that

Servo locking mechanism, buffer unit and punching machine described in the utility model, by watching for servo locking mechanism The design for taking valve and fuel feeding assembly can control the speed of die-cushion sliding block rising to reduce power and generation when it collides board Noise.Furthermore it is moved down in advance before formed punch punching press by die-cushion sliding block, impact force when upper mold moment impact workpiece can be reduced And the noise generated.

Detailed description of the invention

Fig. 1 is a front-view schematic diagram of existing punching machine, illustrates a die-cushion sliding block position in a lower dead point position；

Fig. 2 is a front-view schematic diagram of existing punching machine, illustrates the die-cushion sliding block position in a upper dead center position；

Fig. 3 is a front-view schematic diagram of an embodiment of the punching machine that the utility model has buffer unit, illustrates a die-cushion Sliding block position is in a lower dead point position and a valve rod position in a blocking position；

Fig. 4 is a partial enlarged view of the embodiment, illustrates that a servo valve switches to an oil extraction state and two cylinders drive The die-cushion sliding block is moved to move up；

Fig. 5 is a front-view schematic diagram of the embodiment, illustrates the die-cushion sliding block position in a upper dead center position；

Fig. 6 is a front-view schematic diagram of the embodiment, illustrates that the servo valve switches to an oil inlet state, makes the first hydraulic oil A piston is pushed to drive the die-cushion sliding block to move down；

Fig. 7 is a front-view schematic diagram of the embodiment, illustrates the die-cushion sliding block position in the lower dead point position, which cuts The dissengaged positions is shifted to, and a formed punch drives one workpiece of a upper mold punching press.

Wherein:

2 workpiece

3 punching machines

31 boards

311 pedestals

312 stop parts

313 top surfaces

32 formed punches

33 upper molds

34 lower molds

35 buffer units

36 carriers

37 driving mechanisms

371 cylinders

38 die-cushion sliding blocks

39 mandrils

40 fuel tanks

401 oil storage spaces

402 first hydraulic oil

403 roofs

41 cushion dashpots

411 buffering cylinder bodies

412 piston rods

413 pistons

414 upper chambers

415 lower oil chamber

416 cock bodys

417 check valves

42 servo locking mechanisms

43 oil-hydraulic cylinders

431 runners

432 grease chambers

433 communication ports

44 valve rods

45 servo valves

451 ports

452 oil inlets

453 oil discharge outlets

454 first petroleum pipelines

455 second petroleum pipelines

46 fuel feeding assemblies

460 second hydraulic oil

461 oil drums

462 servopumps

463 servo motors

D1 moves up direction

D2 moves down direction

I1 first movement direction

The second moving direction of I2

The middle position P1

P2 first switches through position

P3 second switches through position

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

It is an embodiment of the punching machine 3 that the utility model has buffer unit, punching machine 3 is to a workpiece 2 refering to Fig. 3 and Fig. 4 Carry out stamping forming processing operation.

Punching machine 3 includes a board 31, a formed punch 32, a upper mold 33, once mold 34 and a buffer unit 35.Board 31 include a pedestal 311 and a stop part 312, and stop part 312 is set to a top surface 313 of pedestal 311.Formed punch 32 can be upper and lower It is movably set to board 31 and is located at interval at 311 top of pedestal.Upper mold 33 is set to 32 bottom end of formed punch.Lower mold 34 is arranged In the pedestal 311 of board 31 top surface 313 and be located at interval at the lower section of upper mold 33.

Buffer unit 35 includes a carrier 36, a driving mechanism 37, a die-cushion sliding block 38, more mandrils 39, a fuel tank 40, a cushion dashpot 41 and a servo locking mechanism 42.Carrier 36 is fixedly arranged at pedestal 311 and is located at interval at top surface 313 lower sections.Driving mechanism 37 includes two and is set to 36 top surface of carrier and the cylinder 371 of left and right separately.Die-cushion sliding block 38 The merging that connects with two cylinders 371 of driving mechanism 37 can be driven by it and be moved.Fuel tank 40 is set to 36 bottom surface of carrier simultaneously An oil storage space 401 is defined, oil storage space 401 stores one first hydraulic oil 402.Cushion dashpot 41 includes a buffering cylinder body 411, a piston rod 412 and a piston 413.Buffering cylinder body 411 is fixedly arranged at 403 bottom surface of a roof and the position of fuel tank 40 In in oil storage space 401, and buffers cylinder body 411 and be located at below carrier 36.Piston rod 412 can be arranged in carrying up or down Frame 36, the roof 403 of fuel tank 40 and buffering cylinder body 411,412 top of piston rod is fixedly connected to die-cushion sliding block 38.Piston 413 It is set in buffering cylinder body 411 and set is fixed in piston rod 412.Buffering cylinder body 411 defines a upper chamber for being located at 413 top of piston 414 and one be located at the lower section of piston 413 lower oil chamber 415, lower oil chamber 415 is connected with the oil storage space 401 of fuel tank 40.It oils Room 414 and lower oil chamber 415 are to accommodate the first hydraulic oil 402.Piston 413 has a cock body 416 and multiple is set to cock body Check valve 417 in 416, the first hydraulic oil 402 in lower oil chamber 415 can unidirectionally flow into upper chamber 414 via check valve 417 It is interior.

Servo locking mechanism 42 includes an oil-hydraulic cylinder 43, a valve rod 44, a servo valve 45 and a fuel feeding assembly 46. Oil-hydraulic cylinder 43 is fixedly arranged at 40 side of fuel tank and defines the upper chamber 414 and fuel tank for being connected to buffering cylinder body 411 Runner 431 between 40 oil storage space 401, runner 431 is with for the flowing of the first hydraulic oil 402.Valve rod 44 is movably set It is placed in circulation or blocking in oil-hydraulic cylinder 43 to control runner 431.Servo valve 45 is position closed circuit type in one or four mouthfuls three Oil pressure servo valve, servo valve 45 have a port 451, an oil inlet 452 and an oil discharge outlet 453.Port 451 passes through one first Petroleum pipeline 454 is connected with a grease chamber 432 of oil-hydraulic cylinder 43.Oil inlet 452 passes through one second petroleum pipeline 455 and fuel feeding assembly 46 are connected.Servo valve 45 can switch between a dissengaged positions, an oil inlet state and an oil extraction state.When servo valve 45 exists When dissengaged positions, servo valve 45 in a middle position P1, at this point, port 451 can not be with 453 phase of oil inlet 452 and oil discharge outlet Connection, servo valve 45 block fuel feeding assembly 46 to supply in one second hydraulic oil 460 to the grease chamber 432 of oil-hydraulic cylinder 43.Work as servo When valve 45 switches to oil inlet state, servo valve 45 switches to one first and switches through position P2, at this point, port 451 and 452 phase of oil inlet Connection, fuel feeding assembly 46 can be supplied in the second hydraulic oil 460 to the grease chamber 432 of oil-hydraulic cylinder 43 by servo valve 45, with driving Valve rod 44 is moved to 433 blocking position of a communication port (as shown in Figure 3) of a blocking runner 431.When 45 row of switching to of servo valve When oil condition, servo valve 45 switches to one second and switches through position P3, at this point, port 451 is connected with oil discharge outlet 453, servo valve 45 can control the flow for the second hydraulic oil 460 being discharged in the grease chamber 432 by oil-hydraulic cylinder 43 to adjust valve rod 44 and block runner 431 433 degree of communication port, and then control the flow velocity of the first hydraulic oil 402 in runner 431.

Specifically, the fuel feeding assembly 46 of the present embodiment includes an oil drum 461, a servopump 462 and a servo motor 463.Oil drum 461 stores the second hydraulic oil 460.Servopump 462 is set in oil drum 461 and connect with the second petroleum pipeline 455. Servo motor 463 is connect with servopump 462 to be operated to control servopump 462, and servopump 462 is made to extract the in oil drum 461 Two hydraulic oil 460 and servo valve 45 is delivered to by the second petroleum pipeline 455.By the variation of 463 output power of servo motor, It can control servopump 462 and supply the second hydraulic oil 460 of different flow to servo valve 45.

When die-cushion sliding block 38 when just like lower dead point position shown in Fig. 3,413, piston of cushion dashpot 41 are in Fig. 3 institute The lower dead point position shown, servo valve 45 make valve rod 44 be located in blocking position in dissengaged positions.At this point, cushion dashpot 41 is upper The first hydraulic oil 402 in grease chamber 414 can not flow into runner 431.Stop by the first hydraulic oil 402 in upper chamber 414 Piston 413 moves up, and die-cushion sliding block 38 is enabled to be securely positioned in lower dead point position.

Refering to Fig. 4 and Fig. 5, the two cylinders 371 driving die-cushion sliding block 38 of driving mechanism 37 to be penetrated is moved by lower dead point position When moving to just like upper dead center position shown in fig. 5, servo valve 45 can first switch to oil extraction state.At this point, servo valve 45 can control Flow by the second hydraulic oil 460 being discharged in the grease chamber 432 of oil-hydraulic cylinder 43, to control valve rod 44 along a first movement direction The degree of I1 mobile distance and then the communication port 433 for adjusting the blocking runner 431 of valve rod 44.For Fig. 4, valve rod 44 blocks stream The middle section of port 433, and communication port 433 is not blocked and in open state by valve rod 44 close to peripheral part.Then, two gas Cylinder 371 drives die-cushion sliding block 38 to move up direction D1 along one and up moves, and die-cushion sliding block 38 will drive top during up moving Bar 39 is up moved by the up pushing tow of workpiece 2, and through piston rod 412 with piston 413.The mistake that piston 413 up moves In, the first hydraulic oil 402 in upper chamber 414 can not flow downstream into lower oil chamber 415 via each check valve 417, therefore, piston 413 cock body 416 and check valve 417, which can squeeze the first hydraulic oil 402 in upper chamber 414, flows into it along direction shown in arrow In runner 431.Due to communication port 433 only close to peripheral part it is in open state, the first hydraulic oil 402 flows through Flow can become smaller when port 433 and flow velocity can be slack-off.Flow velocity by the first hydraulic oil 402 of limitation is slack-off, to limit work 413 edge of plug moves up the speed that direction D1 is moved.Although each cylinder 371 is to push die-cushion sliding block 38 to move up with a scheduled thrust, But piston 413 is slowed down along the speed for moving up direction D1 and moving, so as to cause work because the flow velocity of the first hydraulic oil 402 is limited Stopper rod 412 and die-cushion sliding block 38 can only be moved up with piston 413 with identical speed.Whereby, it can slow down what die-cushion sliding block 38 moved up Speed.

When 38 top of die-cushion sliding block collides stop part 312, die-cushion sliding block 38 just can not be further continued for moving up, at this point, mould Sliding block 38, pad is in upper dead center position.Servo valve 45 can control the second hydraulic oil 460 and maximum flow is discharged, and make valve rod 44 along One moving direction I1 is moved to a non-obstructing position for not blocking communication port 433 completely as shown in Figure 5.Due on die-cushion sliding block 38 The speed of shifting is slower, therefore, can reduce by 38 top of die-cushion sliding block collision stop part 312 when power and generation noise, by This, can be effectively reduced die-cushion sliding block 38 and stop part 312 is impaired to promote its service life.

Refering to Fig. 5 and Fig. 6, when formed punch 32 to be penetrated drives 33 stamped workpieces 2 of upper mold, servo valve 45 switches to oil inlet shape State, servo motor 463 supply the second hydraulic oil 460 to servo valve 45, and servo valve 45 exports the second liquid by the first petroleum pipeline 454 In pressure oil 460 to the grease chamber 432 of oil-hydraulic cylinder 43, make the second hydraulic oil 460 that valve rod 44 be pushed to move along one second moving direction I2 It is dynamic.Whereby, the size that can control the unlatching of communication port 433 is injected into upper chamber 414 to control the first hydraulic oil 402 in runner 431 It is interior.Whereby, the first hydraulic oil 402 can squeeze down the cock body 416 of piston 413 so that piston 413 pulls down piston rod 412, And then die-cushion sliding block 38, mandril 39 and workpiece 2 is driven to move down.Piston 413 move down excessively in, first in lower oil chamber 415 Hydraulic oil 402 then can up flow into upper chamber 414 along direction shown in arrow via each check valve 417, so that the first hydraulic oil 402 can be promptly toward flowing upwardly in upper chamber 414.Whereby, the first hydraulic oil 402 can through extrusion piston 413 cock body 416 it is fast Fast area dynamic model pad sliding block 38, mandril 39 and workpiece 2 move down a trip in advance.

Refering to Fig. 6 and Fig. 7, when die-cushion sliding block 38, mandril 39 and workpiece 2 are displaced downwardly to position shown in fig. 6 in advance, formed punch And then 32 can drive upper mold 33 to move down along direction D2 is moved down.It can be touched in 33 folding process of upper mold while down Mobile workpiece 2, so that the impact force of 33 moment impact workpiece 2 of upper mold reduces, and generated noise can also subtract when impact It is small.Whereby, upper mold 33 can be reduced to be damaged during impacting workpiece 2 to improve its service life.

When die-cushion sliding block 38 is moved to lower dead point position shown in Fig. 7, workpiece 2 is connected on lower mold 34.Upper mold And then 33 stamped workpieces 2 and can match with lower mold 34 and workpiece 2 is shaped to required shape.Then, servo motor 463 Maximum Power Outputs simultaneously control servopump 462 and supply the second hydraulic oil 460 of maximum stream flow to servo valve 45, servo valve 45 In the second hydraulic oil 460 to the grease chamber 432 of oil-hydraulic cylinder 43 for exporting maximum stream flow by the first petroleum pipeline 454, make the second liquid Pressure oil 460 rapidly pushes valve rod 44 to be moved to blocking position shown in Fig. 7 along the second moving direction I2.Then, servo valve 45 Dissengaged positions can be switched to, so that die-cushion sliding block 38 is rapidly positioned at lower dead point position.

In conclusion the punching machine 3 of the present embodiment, by the servo valve 45 and fuel feeding assembly 46 of servo locking mechanism 42 Design, can control the second hydraulic oil 460 being discharged in the grease chamber 432 by oil-hydraulic cylinder 43 when servo valve 45 in oil extraction state Flow with adjust valve rod 44 block runner 431 433 degree of communication port, and then control runner 431 in the first hydraulic oil 402 Flow velocity.Whereby, can control die-cushion sliding block 38 rising speed with reduce its collide board 31 stop part 312 when power and The noise of generation.Furthermore it is moved down in advance before 32 punching press of formed punch by die-cushion sliding block 38,33 moment impact work of upper mold can be reduced The noise of impact force and generation when part 2, therefore the purpose of the utility model can be reached really.

The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The widest scope consistent with features of novelty.

Claims (8)

1. a kind of servo locking mechanism characterized by comprising oil-hydraulic cylinder, valve rod, fuel feeding assembly and servo valve, wherein Valve rod is movably arranged in the oil-hydraulic cylinder；Fuel feeding assembly includes one to store the oil drum of the second hydraulic oil, one be set to The oil drum and the servopump being connect with the second petroleum pipeline and the servo motor that is connect with the servopump；Servo valve has one to lead to Mouthful, an oil inlet and an oil discharge outlet, the port be connected by the first petroleum pipeline with the oil-hydraulic cylinder, which passes through the Two petroleum pipelines are connected with the fuel feeding assembly.

2. servo locking mechanism as described in claim 1, it is characterised in that: servo valve is position closed circuit type in one or four mouthfuls three Oil pressure servo valve.

3. a kind of buffer unit characterized by comprising a servo locking mechanism, the servo locking mechanism are wanted for right Servo locking mechanism described in asking 1.

4. buffer unit as claimed in claim 3, which is characterized in that further include:

One carrier；

One driving mechanism is set on the carrier；

One die-cushion sliding block, the merging that connects with the driving mechanism can be driven by it and be moved；

One fuel tank is set to the carrier and stores one first hydraulic oil；

One cushion dashpot, including a buffering cylinder body, a piston rod and a piston, the cushion dashpot body are located at below the carrier, the work Stopper rod can be arranged in the carrier and the buffering cylinder body up or down and be fixedly connected to the die-cushion sliding block, piston setting In in the cushion dashpot body and set be fixed in the piston rod, the buffering cylinder body define one be located at the piston above upper chamber, Ji Yiwei The lower oil chamber being connected below the piston and with the fuel tank.

5. buffer unit as described in claim 3 or 4, it is characterised in that: servo valve is position closed circuit type in one or four mouthfuls three Oil pressure servo valve.

6. a kind of punching machine characterized by comprising a buffer unit, the buffer unit are buffering as claimed in claim 3 dress It sets.

7. punching machine as claimed in claim 6, which is characterized in that further include: a board, a formed punch, a upper mold, a lower die Tool, wherein board includes a pedestal and a stop part, and stop part is set to a top surface of pedestal；Upper mold is set to formed punch bottom End；Lower mold is set to the top surface of the pedestal of board.

8. punching machine as claimed in claim 6, which is characterized in that the buffer unit further include:

One carrier；

One driving mechanism is set on the carrier；

One die-cushion sliding block, the merging that connects with the driving mechanism can be driven by it and be moved；

One fuel tank is set to the carrier and stores one first hydraulic oil；

One cushion dashpot, including a buffering cylinder body, a piston rod and a piston, the cushion dashpot body are located at below the carrier, the work Stopper rod can be arranged in the carrier and the buffering cylinder body up or down and be fixedly connected to the die-cushion sliding block, piston setting In in the cushion dashpot body and set be fixed in the piston rod, the buffering cylinder body define one be located at the piston above upper chamber, Ji Yiwei The lower oil chamber being connected below the piston and with the fuel tank.