阅读说明：本技术 电镦锻造用的四柱压力机及油路系统 (Four-column press and oil circuit system for electric upsetting forging ) 是由 牛永 牛林涛 于 2020-08-20 设计创作，主要内容包括：本发明涉及一种电镦锻造用的四柱压力机及油路系统,包括上滑块、下滑块,所述上滑块和下滑块分别套在导柱上并与导柱滑动连接,所述液压缸上的伸缩杆与上滑块固定连接,所述顶板、上滑块、下滑块和底座之间通过拉绳联动机构连接,以使上滑块和下滑块作相互远离或靠近的运动。本发明通过拉绳联动机构的设置,使上滑块上的上模与下滑块上的下模之间相互撞击对工件实现锻造,双向撞击产生的锻造力大,而驱动上滑块移动所需的驱动力小,可以采用小油缸的液压缸即可实现上滑块的运动,并达到锻造所需的力,由于采用液压缸的油缸小,充油快,效率高,液压缸上的伸缩杆进给速度快,有助于提高生产效率。(The invention relates to a four-column press for electric upsetting forging and an oil circuit system, which comprise an upper slide block and a lower slide block, wherein the upper slide block and the lower slide block are respectively sleeved on a guide post and are in sliding connection with the guide post, a telescopic rod on a hydraulic cylinder is fixedly connected with the upper slide block, and a top plate, the upper slide block, the lower slide block and a base are connected through a pull rope linkage mechanism so as to enable the upper slide block and the lower slide block to move away from or close to each other. According to the invention, through the arrangement of the pull rope linkage mechanism, the upper die on the upper sliding block and the lower die on the lower sliding block mutually impact to forge a workpiece, the forging force generated by bidirectional impact is large, the driving force required for driving the upper sliding block to move is small, the movement of the upper sliding block can be realized by adopting a hydraulic cylinder of a small oil cylinder, and the force required for forging is achieved.)

1. The utility model provides a four post presses of electric upsetting forging usefulness, includes roof, base, fixed four evenly distributed's guide pillar between roof and the base, install the pneumatic cylinder on the roof, its characterized in that: the upper sliding block and the lower sliding block are respectively sleeved on the guide post and are in sliding connection with the guide post, a telescopic rod on the hydraulic cylinder is fixedly connected with the upper sliding block, and the upper sliding block and the lower sliding block are connected through a pull rope linkage mechanism to reach a balanced state, so that the gravity between the upper sliding block and the lower sliding block is mutually offset and moves away from or close to each other;

the pull rope linkage mechanism comprises a first pulley support, a second pulley support and a third pulley support, wherein the first pulley supports are respectively provided with pulley blocks, the first pulley supports are respectively fixed on the side walls of the top plate and the base, the second pulley supports are fixed on the side wall of the upper sliding block in a vertically arranged mode, the number of the third pulley supports is two, the vertically arranged modes are fixed on the side wall of the lower sliding block, the pulley blocks on the first pulley support on the top plate, the pulley blocks on the second pulley support above the top plate and the pulley blocks on the third pulley support above the top plate are all connected through winding of an upper pull rope, and the pulley blocks on the first pulley support on the base, the pulley blocks on the third pulley support below the bottom plate and the pulley blocks on the second pulley support below the bottom plate are all connected through winding of a lower pull rope.

2. The four-column press for electric upsetting forging as recited in claim 1, wherein: the weights of the upper sliding block and the lower sliding block are equal.

3. The four-column press for electric upsetting forging as recited in claim 1, wherein: the pulley block on the first pulley support comprises at least three pulleys which are arranged in parallel, and the pulley blocks on the second pulley support and the third pulley support comprise at least two pulleys which are arranged in parallel.

4. The four-column press for electric upsetting forging as recited in claim 1, wherein: the number of the pull rope linkage mechanisms is two and the two pull rope linkage mechanisms are respectively positioned on the two sides of the top plate and the base.

5. The four-column press for electric upsetting forging as recited in claim 1, wherein: the upper sliding block, the lower sliding block and the guide pillar are connected in a sliding mode through bushing components, and the bushing components are installed on the upper sliding block and the lower sliding block respectively.

6. The four-column press for electric upsetting forging as recited in claim 5, wherein: the bushing assembly comprises a fixed cylinder, an installation sleeve and a copper sleeve, the fixed cylinder is fixed on the corresponding upper sliding block or the corresponding lower sliding block, the installation sleeve is located in the fixed cylinder, the top end of the installation sleeve extends to the upper portion of the fixed cylinder, the top end of the installation sleeve is connected with the fixed cylinder, the inner wall of the fixed cylinder and the outer wall of the installation sleeve are of conical surface structures matched with each other, the copper sleeve is installed in the installation sleeve, and the guide pillar penetrates through the copper sleeve.

7. The four-column press for electric upsetting forging as recited in claim 6, wherein: the installation cover is formed by splicing at least four arc-shaped plates, each arc-shaped plate is detachably connected with the top end of the fixing cylinder through a pressing plate, an arc-shaped copper plate is installed on the inner side wall of each arc-shaped plate, and the arc-shaped copper plates are spliced to form a copper sleeve.

8. The four-column press for electric upsetting forging as recited in claim 7, wherein: the improved arc-shaped bolt pressing machine is characterized in that at least two hollow studs are connected to the pressing plate in a threaded mode, the bottom ends of the hollow studs are rotatably connected with the top end of the fixing cylinder, inner hexagon bolts are arranged in the hollow studs and are in threaded connection with the top end of the fixing cylinder so as to compress the hollow studs, locking nuts are connected to the outer wall of the hollow studs in a threaded mode so as to compress the pressing plate, a groove is formed in the top of the outer wall of the arc-shaped plate, and one end of the pressing plate is inserted into the groove so that the arc-shaped plate.

9. The utility model provides an oil piping system of four post presses of electric upsetting forging usefulness which characterized in that: the four-column press for electric upsetting forging is the four-column press for electric upsetting forging as claimed in any one of claims 1 to 8, and comprises an oil pump, a first branch system and a second branch system, wherein the oil pump is sequentially connected with an overflow valve, a first check valve, a check stop valve and an energy accumulator, the energy accumulator is respectively connected with the first branch system and the second branch system, the first branch system comprises a first electromagnetic directional valve, a first pressure reducing valve and two first throttle valves, a P port end of the first electromagnetic directional valve is connected with the energy accumulator through the first pressure reducing valve, an A port end of the first electromagnetic directional valve is connected with an oil inlet of an oil cylinder on a hydraulic cylinder through one first throttle valve, a B port end of the first electromagnetic directional valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder through the other first throttle valve, the second branch system comprises an electro-hydraulic directional valve, the port P end of the electro-hydraulic reversing valve is connected with the energy accumulator, the port A end of the electro-hydraulic reversing valve is connected with an oil inlet of an oil cylinder on the hydraulic cylinder, and the port B end of the electro-hydraulic reversing valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder.

10. The oil piping system of the four-column press for electric upsetting forging as recited in claim 9, wherein: the energy accumulator is further connected with a third branch system, the third branch system comprises a second pressure reducing valve, a second electromagnetic directional valve and two second throttle valves, the P opening end of the second electromagnetic directional valve is connected with the energy accumulator through the second pressure reducing valve, the A opening end of the second electromagnetic directional valve is connected with an oil inlet of an oil cylinder on the hydraulic cylinder through one second throttle valve, and the B opening end of the second electromagnetic directional valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder through the other second throttle valve.

Technical Field

The invention relates to the technical field of stamping equipment, in particular to a four-column press for electric upsetting forging and an oil circuit system.

Background

The press machine can be widely applied to the processes of cutting, punching, blanking, bending, riveting, forming and the like. The metal is processed into parts by applying a strong pressure to the metal blank to cause plastic deformation and fracture of the metal.

The press machine has a hydraulic press, a screw press and a crank press, the stroke of the crank press can not be adjusted, a bottom dead center can be generated, the screw press is large in size and high in requirement on a foundation, for the hydraulic press, an upper die capable of moving is driven by a hydraulic cylinder in the prior art, a lower die is in a fixed state, the upper die is driven by the hydraulic cylinder to move downwards during forging, the upper die is matched with the lower die to forge a workpiece, the force ratio required by forging is large, the corresponding hydraulic cylinder is also large, the speed is relatively slow in the oil filling process, the feeding speed of the hydraulic cylinder is also slow, and therefore the production efficiency is reduced.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a four-column press for electric upsetting forging and an oil way system.

In order to achieve the purpose, the invention adopts the technical scheme that:

a four-column press for electric upsetting forging comprises a top plate and a base, wherein four guide columns which are uniformly distributed are fixed between the top plate and the base, a hydraulic cylinder is mounted on the top plate, the four-column press further comprises an upper sliding block and a lower sliding block, the upper sliding block and the lower sliding block are respectively sleeved on the guide columns and are in sliding connection with the guide columns, a telescopic rod on the hydraulic cylinder is fixedly connected with the upper sliding block, and the upper sliding block and the lower sliding block are connected through a stay cord linkage mechanism to reach a balanced state, so that the gravity between the upper sliding block and the lower sliding block is mutually offset and move away from or close to each other;

the pull rope linkage mechanism comprises a first pulley support, a second pulley support and a third pulley support, wherein the first pulley supports are respectively provided with pulley blocks, the first pulley supports are respectively fixed on the side walls of the top plate and the base, the second pulley supports are fixed on the side wall of the upper sliding block in a vertically arranged mode, the number of the third pulley supports is two, the vertically arranged modes are fixed on the side wall of the lower sliding block, the pulley blocks on the first pulley support on the top plate, the pulley blocks on the second pulley support above the top plate and the pulley blocks on the third pulley support above the top plate are all connected through winding of an upper pull rope, and the pulley blocks on the first pulley support on the base, the pulley blocks on the third pulley support below the bottom plate and the pulley blocks on the second pulley support below the bottom plate are all connected through winding of a lower pull rope.

In any of the above aspects, the weight of the upper slider and the weight of the lower slider are preferably equal.

In any of the above schemes, preferably, the pulley block on the first pulley support includes at least three pulleys which are all arranged in parallel, and the pulley blocks on the second pulley support and the third pulley support include at least two pulleys which are all arranged in parallel.

In any of the above aspects, preferably, the number of the rope pulling linkage mechanisms is two, and the two rope pulling linkage mechanisms are respectively positioned at two sides of the top plate and the base.

In any of the above schemes, preferably, the upper slider and the lower slider are slidably connected with the guide pillar through bushing assemblies, and the bushing assemblies are respectively mounted on the upper slider and the lower slider.

In any of the above schemes, preferably, the bushing assembly includes a fixed cylinder, an installation sleeve, and a copper sleeve, the fixed cylinder is fixed on the corresponding upper slider or lower slider, the installation sleeve is located in the fixed cylinder, the top end of the installation sleeve extends to the upper side of the fixed cylinder, the top end of the installation sleeve is connected with the fixed cylinder, the inner wall of the fixed cylinder and the outer wall of the installation sleeve are in a conical surface structure matched with each other, the copper sleeve is installed in the installation sleeve, and the guide post penetrates through the copper sleeve.

In any of the above schemes, preferably, the mounting sleeve is formed by splicing at least four arc-shaped plates, an arc-shaped copper plate is mounted on the inner side wall of each arc-shaped plate, the arc-shaped copper plates are spliced to form a copper sleeve, and each arc-shaped plate is detachably connected with the top end of the fixed cylinder through a pressing plate.

In any of the above schemes, preferably, the pressing plate is in threaded connection with at least two hollow studs, the bottom ends of the hollow studs are rotatably connected with the top end of the fixed cylinder, inner hexagon bolts are arranged in the hollow studs, the inner hexagon bolts are in threaded connection with the top end of the fixed cylinder to compress the hollow studs, locking nuts are in threaded connection with the outer wall of the hollow studs to compress the pressing plate, a groove is formed in the top of the outer wall of the arc-shaped plate, and one end of the pressing plate is inserted into the groove to enable the arc-shaped plate to slide radially.

The invention also provides an oil circuit system of the four-column press for electric upsetting forging, which is the four-column press for electric upsetting forging and comprises an oil pump, a first branch system and a second branch system, wherein the oil pump is sequentially connected with an overflow valve, a first one-way valve, a one-way stop valve and an energy accumulator, the energy accumulator is respectively connected with the first branch system and the second branch system, the first branch system comprises a first electromagnetic reversing valve, a first pressure reducing valve and two first throttle valves, the port P end of the first electromagnetic reversing valve is connected with the energy accumulator through the first pressure reducing valve, the port A end of the first electromagnetic reversing valve is connected with an oil inlet of an oil cylinder on a hydraulic cylinder through one first throttle valve, the port B end of the first electromagnetic reversing valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder through the other first throttle valve, the second branch system comprises an electro-hydraulic reversing valve, the P opening end of the electro-hydraulic reversing valve is connected with the energy accumulator, the A opening end of the electro-hydraulic reversing valve is connected with an oil inlet of an oil cylinder on the hydraulic cylinder, and the B opening end of the electro-hydraulic reversing valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder.

In any of the above schemes, preferably, the energy accumulator is further connected with a third branch system, the third branch system includes a second pressure reducing valve, a second electromagnetic directional valve and two second throttle valves, a P port end of the second electromagnetic directional valve is connected with the energy accumulator through the second pressure reducing valve, a port end of the second electromagnetic directional valve is connected with an oil inlet of an oil cylinder on the hydraulic cylinder through one second throttle valve, and a port end B of the second electromagnetic directional valve is connected with an oil outlet of the oil cylinder on the hydraulic cylinder through another second throttle valve.

Compared with the prior art, the four-column press and the oil way system for electric upsetting forging have the following beneficial effects:

1. the upper sliding block and the lower sliding block are connected through the stay cord linkage mechanism, when the hydraulic cylinder drives the upper sliding block to move up and down, the lower sliding block can move along with the upper sliding block to move close to or away from each other, so that an upper die on the upper sliding block and a lower die on the lower sliding block mutually collide to forge a workpiece, the forging force is large, the weights of the upper sliding block and the lower sliding block are equal, and the weights of the upper sliding block and the lower sliding block are mutually offset through the stay cord linkage mechanism, so that the weight of the upper sliding block does not need to act on the hydraulic cylinder, the driving force required for driving the upper sliding block to move is reduced, the movement of the upper sliding block can be realized by adopting the hydraulic cylinder with small cylinder diameter and small stroke, the force required for forging is achieved, the cylinder diameter of the hydraulic cylinder is small, the oil filling is fast, the efficiency is, the oil cylinder of the hydraulic cylinder is a standard oil cylinder, so that the hydraulic cylinder is easy to purchase and convenient to replace;

2. the pressing plate drives the corresponding arc-shaped plate to move along the radial direction of the mounting sleeve in the downward moving process, so that the adjustment of the size of the gap between the copper sleeve and the guide pillar is realized, the phenomenon that the gap between the guide pillar and the copper sleeve is enlarged and the machining precision is reduced and the requirement is not met after the copper sleeve is worn for a long time is avoided, the waste of resources is reduced, and the cost is saved;

3. in the oil circuit system, because the electro-hydraulic reversing valve in the second branch is directly connected with the energy accumulator, the stored energy of the energy accumulator is directly released, and the telescopic rod on the oil cylinder realizes quick feeding without the adjustment of oil pressure and oil flow rate, so that the upper sliding block has high running speed.

Drawings

FIG. 1 is a schematic overall structure diagram of a four-column press for electric upsetting forging according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the embodiment of FIG. 1;

FIG. 3 is an overall perspective view of the bushing assembly of FIG. 2;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a cross-sectional view of the bushing assembly of FIG. 3;

fig. 6 is a diagram of an oil circuit system of the four-column press.

The figures are labeled as follows: 1. a top plate; 2. an upper slide block; 3. a lower slide block; 4. a base; 5. a guide post; 6. pulling a rope upwards; 7. a lower pull rope; 8. a hydraulic cylinder; 9. a first pulley bracket; 10. a second sheave bracket; 11. a third pulley holder; 12. a bushing assembly; 13. a fixed cylinder; 14. a hollow stud; 15. a clamping plate; 16. an arc-shaped plate; 17. pressing a plate; 18. an arc copper plate; 19. an oil cylinder; 20. a first electromagnetic directional valve; 21. a first pressure reducing valve; 22. a first throttle valve; 23. an electro-hydraulic directional valve; 24. an accumulator; 25. an overflow valve; 26. a one-way stop valve; 27. an oil pump; 28. a second electromagnetic directional valve; 29. a second pressure reducing valve; 30. a hexagon socket head cap screw; 31. and locking the nut.

Detailed Description

In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.

As shown in fig. 1 to 6, an embodiment of a four-column press for electric upsetting forging according to the present invention includes a top plate 1, a base 4, four guide posts 5 uniformly distributed between the top plate 1 and the base 4, a hydraulic cylinder 8 mounted on the top plate 1, an upper slider 2 and a lower slider 3, wherein the upper slider 2 and the lower slider 3 are respectively sleeved on the guide posts 5 and the guide posts 5 are slidably connected, an expansion link on the hydraulic cylinder 8 is fixedly connected with the upper slider 2, and the upper slider 2 and the lower slider 3 are connected by a pull rope linkage mechanism to reach a balanced state, such that gravity between the upper slider 2 and the lower slider 3 is cancelled out and moves away from or close to each other;

the pull rope linkage mechanism comprises a first pulley bracket 9, a second pulley bracket 10 and a third pulley bracket 11 which are all provided with pulley blocks, the first pulley brackets 9 are respectively fixed on the side walls of the top plate 1 and the base 4, the second pulley brackets 10 are two and are fixed on the side wall of the upper slide block 2 in an up-and-down arrangement mode, the number of the third pulley brackets 11 is two and the third pulley brackets are fixed on the side wall of the lower slide block 3 in an up-and-down arrangement manner, the pulley block on the first pulley bracket 9, the pulley block on the second pulley bracket 10 and the pulley block on the third pulley bracket 11 on the top plate 1 are wound and connected through the upper pull rope 6, and the pulley block on the first pulley bracket 9, the pulley block on the third pulley bracket 11 which is close to the lower part and the pulley block on the second pulley bracket 10 which is close to the lower part on the base 4 are all connected by winding through the lower pull rope 7.

When the upper sliding block moves upwards, the lower sliding block moves downwards, the pulling force generated by the gravity of the lower sliding block acts on the upper sliding block through the pull rope linkage mechanism, so that the gravity and the pulling force of the upper sliding block are offset, the hydraulic cylinder drives the upper sliding block to move upwards with small force, when the upper sliding block moves downwards, the lower sliding block moves upwards, the pulling force generated by the gravity of the lower sliding block also acts on the upper sliding block through the pull rope linkage mechanism and is offset by the interaction with the gravity of the upper sliding block, and the hydraulic cylinder exerts small force on the upper sliding block so that the upper sliding block can move downwards.

Through the arrangement of the stay cord linkage mechanism, when the hydraulic cylinder 8 drives the upper slide block 2 to move up and down, the lower slide block 3 can move simultaneously with the upper slide block 2, the upper slide block 2 and the lower slide block 3 move close to or away from each other in the stay cord linkage mechanism together, so that the upper slide block 2 drives the upper die and the lower die driven by the lower slide block 3 to mutually impact and forge a workpiece, the forging force is large, the weights of the upper slide block and the lower slide block are equal, the weights of the upper slide block and the lower slide block are mutually offset through the stay cord linkage mechanism, the gravity of the upper slide block does not need to act on the hydraulic cylinder, the driving force required for driving the upper slide block to move is reduced, the driving force required for driving the upper slide block 2 is small, the hydraulic cylinder with small cylinder diameter and small stroke can be adopted to realize the movement of the upper slide block and achieve the force required for forging, the oil, the telescopic rod feeding speed on the hydraulic cylinder is high, the production efficiency is improved, and the oil cylinder of the hydraulic cylinder is a standard oil cylinder, is easy to purchase and is convenient to replace.

The weights of the upper sliding block 2 and the lower sliding block 3 are equal, so that the upper sliding block 2 and the lower sliding block 3 are kept balanced.

The pulley blocks on the first pulley support 9 comprise at least three pulleys which are arranged in parallel, and the pulley blocks on the second pulley support 10 and the third pulley support 11 comprise at least two pulleys which are arranged in parallel. When the number of the pulleys on the first pulley support 9 is three, and the number of the pulleys on the second pulley support 10 is two, the two ends of the upper pull rope 6 are fixed with the first pulley support 9 on the side wall of the top plate 1, the two ends of the lower pull rope 7 are fixed with the first pulley support 9 on the side wall of the base 4, the two second pulley supports on the upper slide block are arranged in an up-and-down parallel mode, the two third pulley supports on the lower slide block are arranged in an up-and-down parallel mode, the upper pull rope is respectively wound with the second pulley support above the upper slide block and the third pulley support above the lower slide block, and the lower pull rope is respectively wound with the second pulley support below the upper slide block and the third pulley support below the lower slide block.

The number of the pull rope linkage mechanisms is two and the two pull rope linkage mechanisms are respectively positioned on the two sides of the top plate 1 and the base 4.

Seted up the through-hole that link up respectively on the lateral wall of first pulley bracket 9, second pulley bracket 10 and third pulley bracket 11, the pulley passes through the shaft shoulder screw and installs in the through-hole, winding last stay cord 6 or lower stay cord 7 run through a lateral wall of through-hole on the pulley to make stay cord 6 and lower stay cord 7 extend to the outside in can following corresponding first pulley bracket 9, second pulley bracket 10 and third pulley bracket 11, with the winding on other pulleys.

The upper sliding block 2, the lower sliding block 3 and the guide post 5 are connected in a sliding mode through bushing components 12, and the bushing components 12 are installed on the upper sliding block 2 and the lower sliding block 3 respectively. And four corner ends at the top and the bottom of the upper sliding block 2 are respectively provided with a bushing component 12, and four corner ends at the top and the bottom of the lower sliding block 3 are respectively provided with a bushing component 12.

The bushing assembly 12 comprises a fixed cylinder 13, an installation sleeve and a copper sleeve, the fixed cylinder 13 is fixed on the corresponding upper sliding block 2 or the corresponding lower sliding block 3, the installation sleeve is located in the fixed cylinder 13, the top end of the installation sleeve extends to the upper side of the fixed cylinder 13, the top end of the installation sleeve is connected with the fixed cylinder 13, the inner wall of the fixed cylinder 13 and the outer wall of the installation sleeve are of conical surface structures matched with each other, the copper sleeve is installed in the installation sleeve, and the guide pillar 5 penetrates through the copper sleeve.

The installation sleeve is formed by splicing at least four arc-shaped plates 16, an arc-shaped copper plate 18 is installed on the inner side wall of each arc-shaped plate 16, the arc-shaped copper plates 18 are spliced to form a copper sleeve, and each arc-shaped plate 16 is detachably connected with the top end of the fixed cylinder 13 through a pressing plate 17.

The pressure plate 17 is connected with at least two hollow studs 14 in a threaded manner, the bottom ends of the hollow studs 14 are rotatably connected with the top end of the fixed cylinder 13, inner hexagon bolts 30 are arranged in the hollow studs 14, the inner hexagon bolts 30 are in threaded connection with the top end of the fixed cylinder to tightly press the hollow studs 14, locking nuts 31 are in threaded connection with the outer wall of the hollow studs 14 to tightly press the pressure plate 17, grooves are formed in the tops of the outer walls of the arc-shaped plates 16 of the hollow studs, and one ends of the pressure plate 17 are inserted into the grooves to enable the arc-shaped plates 16 to slide radially.

In this embodiment, the inner wall of installation cover outer wall and fixed cylinder 13 is the circular conical surface structure of mutually supporting, and the installation cover is formed by 16 concatenations of polylith arc, when the clearance between copper sheathing and guide pillar 5 needs to be adjusted, only need to rotate hollow stud 14, make clamp plate 17 drive the arc 16 that corresponds and move down the radial movement that the in-process can follow the installation cover, thereby realized the regulation of clearance size between copper sheathing and the guide pillar 5, avoid because of the copper sheathing after long-time wearing and tearing, the unsatisfied requirement of clearance grow between guide pillar 5 and the copper sheathing and frequently change the copper sheathing, reduce the waste of resource, and save cost.

Wherein, the inner wall bottom of arc 16 is equipped with the arch of outside extension, the top of arc 16 is connected with clamping plate 15 through the bolt is dismantled, arc copper 18 is compressed tightly between clamping plate 15 and arch in order to be fixed with arc 16.

The top of base 4 is fixed with work piece ejector pin, and the bottom central point of top shoe 2 is fixed and is used for the last mould of shaping work piece, and the top central point of lower slider 3 is fixed and is used for the lower mould of shaping work piece, goes up mould and lower mould combined action shaping work piece, and the ejector pin is corresponding with the lower mould, and the work piece ejector pin is ejecting with the fashioned work piece after the shaping.

Telescopic link drive slider-up 2 on the pneumatic cylinder 8 moves down, second pulley bracket 10 on the slider-up 2 moves down, make slider-down 3 move up under first stay cord effect, thereby make the last mould on slider-up 2 and the lower mould on slider-down 3 collide each other and realize forging the work piece, forge the back of accomplishing, pneumatic cylinder 8 drive slider-up 2 shifts up, under second stay cord and 3 gravity effects of slider-down, slider-down 3 moves down, until recovering to initial position, the required drive power of slider-up 2 is little in the whole process, the feed rate of pneumatic cylinder 8 is fast, and the production efficiency is improved.

The invention also provides an oil circuit system of a four-column press for electric upsetting forging, which comprises an oil pump 27, a first branch system and a second branch system, wherein the oil pump 27 is sequentially connected with an overflow valve 25, a first check valve, a check stop valve 26 and an energy accumulator 24, the energy accumulator 24 is respectively connected with the first branch system and the second branch system, the first branch system comprises a first electromagnetic directional valve 20, a first pressure reducing valve 21 and two first throttle valves 22, the P port end of the first electromagnetic directional valve 20 is connected with the energy accumulator 24 through the first pressure reducing valve 21, the A port end of the first electromagnetic directional valve 20 is connected with an oil inlet of an oil cylinder 19 on a hydraulic cylinder 8 through one first throttle valve 22, the B port end of the first electromagnetic directional valve 20 is connected with an oil outlet of the oil cylinder 19 on the hydraulic cylinder 8 through the other first throttle valve 22, the second branch system comprises an electric hydraulic directional valve 23, the P opening end of the electro-hydraulic reversing valve 23 is connected with the energy accumulator 24, the A opening end of the electro-hydraulic reversing valve 23 is connected with an oil inlet of the oil cylinder 19 on the hydraulic cylinder 8, and the B opening end of the electro-hydraulic reversing valve 23 is connected with an oil outlet of the oil cylinder 19 on the hydraulic cylinder 8.

The energy accumulator 24 is further connected with a third branch system, the third branch system comprises a second pressure reducing valve 29, a second electromagnetic directional valve 28 and two second throttle valves, the P port end of the second electromagnetic directional valve 28 is connected with the energy accumulator 24 through the second pressure reducing valve 29, the A port end of the second electromagnetic directional valve 28 is connected with an oil inlet of the oil cylinder 19 on the hydraulic cylinder 8 through one second throttle valve, and the B port end of the second electromagnetic directional valve 28 is connected with an oil outlet of the oil cylinder 19 on the hydraulic cylinder 8 through the other second throttle valve.

An oil inlet of the oil pump 27 is connected with an oil filter, an energy accumulator 24 is installed on the top plate 1, the type of the first electromagnetic directional valve 20 can be DSG-03-3C2-D24, the type of the second electromagnetic directional valve 28 can be DSG-03-3C4-D24, the electromagnetic directional valve has an unloading function, and the type of the electro-hydraulic directional valve 23 can be 4WEH32E50B, but the electromagnetic directional valve is not limited to the above types.

Wherein the first and second pressure reducing valves 21 and 29 regulate the pressure of the oil, and the first and second throttles 22 and 29 regulate the flow rate of the oil.

Because the energy accumulator 24 is connected with the first branch system, the second branch system and the third branch system, the three oil paths can enable the telescopic rod on the oil cylinder 19 to realize three different feeding speeds, one part of the oil pump 27 enters the energy accumulator 24 after passing through the overflow valve 25 and the one-way valve, the other part of the oil pump enters one of the first branch system, the second branch system and the third branch system, when entering the first branch system, the oil pump 27 enters the A port through the P port end of the first electromagnetic directional valve 20 after being decompressed by the first decompression valve 21, and then enters the oil cylinder 19 through the first throttle valve 22 to drive the telescopic rod on the oil cylinder 19 to move; when the second branch system is adopted, the other part enters the port A through the port P of the electro-hydraulic reversing valve 23 and then enters the oil cylinder 19 to directly enter the oil cylinder 19, the stored energy of the energy accumulator 24 is directly released without regulation of oil pressure and oil flow rate, so that the telescopic rod on the oil cylinder 19 realizes rapid feeding, the second branch system has high reaction speed relative to the first branch system, and the third branch system has the unloading function except the same function as the first branch system.

It will be understood by those skilled in the art that the present invention includes any combination of the summary and detailed description of the invention described above and those illustrated in the accompanying drawings, which is not intended to be limited to the details and which, for the sake of brevity of this description, does not describe every aspect which may be formed by such combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.