CN107745020B

CN107745020B - Hydraulic system of four-roller corrugated plate bending machine

Info

Publication number: CN107745020B
Application number: CN201711136768.1A
Authority: CN
Inventors: 吴善普; 吴善照
Original assignee: ANHUI DEXI DHI TECHNOLOGY CO LTD
Current assignee: ANHUI DEXI DHI TECHNOLOGY CO LTD
Priority date: 2017-11-16
Filing date: 2017-11-16
Publication date: 2023-08-01
Anticipated expiration: 2037-11-16
Also published as: CN107745020A

Abstract

The invention discloses a hydraulic system of a four-roller corrugated plate bending machine, and belongs to the technical field of plate bending machines. It includes the control part of the cylinder; the P port of the three-position four-way valve I in the oil cylinder control part is connected with pressure oil of the oil supply control part, the T port of the three-position four-way valve I is connected with an oil tank, the A port of the three-position four-way valve I is connected with the inlet of the one-way valve II, the outlet of the one-way valve II is connected with the lower cavity of the lower roller oil cylinder or the lower cavity of the side roller oil cylinder, the B port of the three-position four-way valve I is connected with the outlet of the sequence valve II, and the inlet of the sequence valve II is connected with the upper cavity of the lower roller oil cylinder or the upper cavity of the side roller oil cylinder; the sequence valve I is connected in parallel with the two ends of the one-way valve II; and the P port of the two-position two-way valve is connected with the outlet end of the sequence valve II, and the A port of the two-position two-way valve is connected with the inlet end of the sequence valve II. The invention can realize the control of the up-and-down movement of the lower roller and the side roller of the veneer reeling machine, ensure the synchronism of the movement of the two ends of the lower roller or the side roller of the veneer reeling machine, and meet the requirements of the veneer reeling machine with different thickness and radian.

Description

Hydraulic system of four-roller corrugated plate bending machine

Technical Field

The invention belongs to the technical field of plate bending machines, and particularly relates to a hydraulic system of a four-roller corrugated plate bending machine.

Background

The plate bending machine (also called a rolling machine) is a machine tool for continuously bending metal plates, and can be divided into a two-roll plate bending machine, a three-roll plate bending machine and a four-roll plate bending machine according to the structure of the machine tool. Two-roll plate bending machines are used for processing large-sized plates, such as ship steel plates, while three-roll and four-roll plate bending machines are used for processing large-sized plates.

The working principle of the three-roller veneer reeling machine is that a plastic metal plate with a flat specification passes through between three working rollers (two lower rollers and one upper roller), and the metal plate is continuously bent for a plurality of times by virtue of the downward pressing of the upper roller and the rotation movement of the lower roller to generate permanent plastic deformation, so that the metal plate is reeled into a cylinder, a cone or a part of the cylinder, the cone; but the arc radius of the corrugated plate processed by the three-roller plate bending machine is basically equal to or close to the radius of the upper roller, the processing of the corrugated plate curled by different diameters is finished by virtue of rollers with different diameters, when the three-roller plate bending machine curls, the two ends of the corrugated plate cannot be processed, a certain rebound exists after the product is processed, the two ends of the obtained corrugated plate are straight, the obtained product is not in a standard arc shape, and the subsequent processing is time-consuming and labor-consuming. The four-roller plate bending machine overcomes the defects of the three-roller plate bending machine, and adopts an upper roller, a lower roller and two side rollers which are parallel to each other and are positioned on two sides of the lower roller, wherein the lower roller and the side rollers are rotatably arranged on a frame and can be driven to move up and down through a hydraulic cylinder, the upper roller is fixed on the frame, the upper roller and the lower roller are both provided with driving mechanisms for driving the upper roller and the lower roller to rotate, and plate bending of plates with various diameters can be more flexibly completed through the cooperation of the four rollers; the rolling die has the characteristics of preflex plate ends at two ends, material alignment, rolling of workpieces with smaller diameters and relatively high rolling precision, and is widely applied to plate roll bending molding.

Because the rolling pressure of the plate bending machine is very high, the frame for supporting each roller is required to have very high strength, therefore, the existing four-roller plate bending machine adopts an integral frame formed by welding plates and is welded with a plurality of reinforcing rib plates so as to improve the strength and the supporting stability of the frame and ensure the precision requirement of plate bending. The integral frame structure is high in natural strength, but has the following disadvantages that components such as each roller, each hydraulic cylinder and corresponding bracket are required to be installed in the installation holes of the frame, so that the components cannot be directly placed in the installation holes from the upper part of the frame, the components are required to be slowly plugged into the corresponding installation holes of the frame from one side of the frame from the side, the components are often large and heavy, the components are required to be installed after being lifted by a crane or the like, the side-inserted installation mode is time-consuming and labor-consuming, collision risks are very easy to occur, the installation process is very careful, three and four people are often assembled together, the time is also required to be several days, and the production efficiency is seriously reduced. In addition, the integral frame has relatively large volume, high welding requirement and difficult guarantee of dimensional accuracy.

The frames of the four-roller plate bending machine at present are all of integral structures, for example, the Chinese patent application number filed by the applicant is: 201210095383.6, publication date: the name of the plate bending machine for corrugated plate is 2012, 7 and 25, and the plate bending machine comprises a hydraulic pile, a frame, rollers and a rolling frame, wherein the rollers comprise two upper rollers and two lower rollers, regular waves are uniformly arranged on the upper rollers, and the waves of the two upper rollers are identical; the number of the lower rollers is two, and the surface of the lower roller is provided with waves corresponding to the waves on the surface of the upper roller; the distance between the two upper rollers is smaller than the distance between the two lower rollers; the distance between the lower roller and the corresponding upper roller is controlled and regulated by means of the forward and backward movement of the roller driven by the hydraulic pile and the vertical up and down movement of the upper roller, when the coil plate for processing corrugated plates with different diameters works, the roller does not need to be replaced, and the hydraulic pile has the advantages that processed products are standard arcs, two ends of a workpiece have no straight line segments, the control precision is high, the hydraulic pile saves time and labor, the appearance of the products is attractive, and the like.

For another example, chinese patent application No.: 201520456363.6, publication date: the patent literature on the year 2015 12 month 23 discloses a four roller veneer reeling machine of micro-control ripple, including fuselage, upper roller, lower roller and base, the both sides of lower roller respectively are equipped with a side roller, the below of side roller and lower roller is equipped with hydraulic drive, upper roller and lower roller all are connected rotatory drive, the last ripple mould that presses of a plurality of groups that adds that is equipped with of upper roller, the last ripple mould that presses that is equipped with of lower roller that adds that is equipped with a plurality of groups and the last ripple mould that presses that matches of upper roller, the ripple mould that presses is formed by upper and lower two mould combination, the interface department of upper and lower piece mould all is equipped with the screw hole, the ripple mould that presses passes through bolt fixed connection on the face of cylinder of upper roller, lower roller. The die of the equipment is convenient to disassemble and assemble; the dies of each group can be freely combined, and can adapt to the pressing of corrugated cylinders with different lengths; the pressing ripple dies on the upper roller and the lower roller can be changed in position, and can press the inner ripple cylinder and the outer ripple cylinder; and a stop device is arranged to prevent the workpiece from deviating.

Both the above solutions are improved in terms of the performance of the rolled sheet, do not take into account the problems of equipment assembly, or possibly do not take into account, but do not provide a good way to facilitate equipment assembly while guaranteeing the strength of the frame, so that the frame supporting each roller is entirely of unitary construction. Also, other four-roller plate bending machines in the prior art also adopt the mode, so that the problems of high difficulty and low efficiency in the equipment assembling process, difficulty in guaranteeing the welding precision of a frame and the like are not solved effectively.

Disclosure of Invention

1. Problems to be solved

The invention provides a hydraulic system of a four-roller corrugated plate bending machine, which aims to solve the problems of

The utility model provides a split type four-roller corrugated plate bending machine, the problem that the assembly degree of difficulty of current four-roller plate bending machine is high, inefficiency to and the frame welding precision that supports each roller is difficult to guarantee is solved. The machine frame for supporting each roller of the plate bending machine adopts a split type structural design and is detachably fastened through the locking mechanism, so that the assembly of the plate bending machine is greatly facilitated, the assembly efficiency is improved, the assembly speed is improved by 3-4 times compared with that of the existing integral structure, and the probability of collision in the assembly process can be effectively reduced.

The veneer reeling machine is further provided with the material supporting device on the basis of the existing structure, and the problem that an arc-shaped plate is difficult to take off after the existing veneer reeling machine is used for reeling is effectively solved.

The invention also provides a hydraulic system of the four-roller corrugated plate bending machine, which controls the plate bending machine, realizes the synchronism of the movement of the two ends of the lower roller or the side roller of the plate bending machine and the like, and ensures the working stability of each roller.

2. Technical proposal

In order to solve the problems, the invention adopts the following technical scheme.

A split four-roller corrugated plate bending machine comprises a pair of frames, an upper roller, a top frame and a tensioning mechanism, wherein the frames are arranged on a base; one end of the upper roller is arranged on one of the frames through a turnover bracket; the other end of the upper roller is arranged on the other frame through a top frame, and two ends of the top frame are detachably connected with the frame through a tensioning mechanism respectively.

As a further improvement, the tensioning mechanism comprises a tensioning connecting rod, a swinging connecting rod and a locking screw sleeve; one end of the tensioning connecting rod is connected with the top frame through a top frame pin shaft, and the other end of the tensioning connecting rod is connected with the frame through an eccentric locking pin shaft; the top frame pin shaft is connected with one end of the upper screw rod; one end of the swing connecting rod is connected with the eccentric locking pin shaft, and the other end of the swing connecting rod is connected with one end of the lower screw rod; and the two ends of the locking screw sleeve are provided with forward and reverse screw holes which are respectively in threaded connection with the other end of the upper screw rod and the other end of the lower screw rod.

As a further improvement, the eccentric locking pin shaft comprises a polygonal end head, a shaft neck, an eccentric section and a shaft neck from one end to the other end, the swinging connecting rod is provided with a hole matched with the polygonal end head, and the axis of the eccentric section and the axis of the shaft neck are provided with eccentric distances.

As a further improvement, two ends of a lower roller of the plate bending machine are respectively connected with the frame through lower roller oil cylinders, the cylinder body of each lower roller oil cylinder is connected with the lower roller, and the piston rod of each lower roller oil cylinder is connected with the frame.

As a further improvement, the side rollers of the plate bending machine are arranged on the side roller support, two ends of the side roller support are respectively connected with the frame through side roller oil cylinders, the cylinder bodies of the side roller oil cylinders are connected with the side roller support, and piston rods of the side roller oil cylinders are connected with the frame.

As a further improvement, a lower roller slot hole and a side roller slot hole are arranged on the frame; the lower roller cylinder is positioned in the lower roller slot hole, and the cylinder body of the lower roller cylinder is in sliding fit with the two side walls of the lower roller slot hole; the side roller cylinder is positioned in the side roller slot hole, and the cylinder body of the side roller cylinder is in sliding fit with two side walls of the side roller slot hole.

As a further improvement, a lower roller bracket is arranged between the two lower roller cylinders, and a support roller assembly is arranged on the lower roller bracket and/or the side roller bracket and is used for supporting the lower roller or the side roller.

As a further improvement, the supporting roller assembly comprises a supporting platform, a wheel seat and an adjusting screw rod which are arranged on the lower roller bracket or the side roller bracket; the wheel seat is provided with a pair of supporting wheels which are supported from two sides below the lower roller or the side roller; a pair of wedge blocks are arranged between the wheel seat and the supporting platform, and the wedge blocks are matched with the inclined surfaces of the wheel seat; and two ends of the adjusting screw are respectively connected with two adjusting nuts arranged in the wedge block.

As a further improvement, the ends of the lower roller support and the side roller support are provided with transverse key grooves, the upper side and the lower side of the transverse key grooves are respectively provided with a longitudinal key groove, the cylinder bodies of the lower roller cylinder and the side roller cylinder are provided with matched transverse key grooves and longitudinal key grooves, and the cylinder bodies of the lower roller support and the lower roller cylinder are matched in a positioning manner through the keys of the transverse key grooves and the transverse key grooves, and the cylinder bodies of the side roller support and the side roller cylinder are matched in a positioning manner.

As a further improvement, a material supporting mechanism is arranged on the discharging side of the plate bending machine; the material supporting mechanism comprises a first material supporting frame and a second material supporting frame which are connected, the first material supporting frame is driven by a first material supporting oil cylinder, and a second material supporting oil cylinder is arranged between the first material supporting frame and the second material supporting frame; the first material supporting frame is provided with a pair of material supporting rollers, and the second material supporting frame is also provided with a material supporting roller.

The hydraulic system of the four-roller corrugated plate bending machine comprises an oil supply control part and an oil cylinder control part, wherein the oil supply control part is used for providing hydraulic oil for the oil cylinder control part, and the oil cylinder control part is used for controlling the action of a lower roller oil cylinder or a side roller oil cylinder; the oil cylinder control part comprises a three-position four-way valve I, a one-way valve II, a sequence valve I, a sequence valve II and a two-position two-way valve, wherein the P port of the three-position four-way valve I is connected with pressure oil of the oil supply control part, the T port of the three-position four-way valve I is connected with an oil tank, the A port of the three-position four-way valve I is connected with the inlet of the one-way valve II, the outlet of the one-way valve II is connected with the lower cavity of the lower roller oil cylinder or the lower cavity of the side roller oil cylinder, the B port of the three-position four-way valve I is connected with the outlet of the sequence valve II, and the inlet of the sequence valve II is connected with the upper cavity of the lower roller oil cylinder or the upper cavity of the side roller oil cylinder; the sequence valve I is connected in parallel with the two ends of the one-way valve II; and the P port of the two-position two-way valve is connected with the outlet end of the sequence valve II, and the A port of the two-position two-way valve is connected with the inlet end of the sequence valve II.

As a further improvement, the oil cylinder control part further comprises a hydraulic control one-way valve I, a hydraulic control one-way valve II and a two-position four-way valve III, wherein the hydraulic control one-way valve I is arranged between the sequence valve II and an upper cavity of the lower roller oil cylinder or an upper cavity of the side roller oil cylinder, the hydraulic control one-way valve II is arranged between the one-way valve II and the lower roller oil cylinder or the side roller oil cylinder, control oil ports of the hydraulic control one-way valve I and the hydraulic control one-way valve II are both connected with a port B of the two-position four-way valve III, a port P of the two-position four-way valve III is connected with pressure oil of the oil supply control part, a port T of the two-position four-way valve III is connected with an oil tank, and a port A of the two-position four-way valve III is cut off.

As a further improvement, the outlet of the hydraulic control one-way valve I is connected to the oil tank through an overflow valve II.

As a further improvement, the oil supply control part comprises an oil pump and an overflow valve I, wherein an inlet of the oil pump is connected with an oil tank, an outlet of the oil pump is connected with a P port of the three-position four-way valve I, and the overflow valve I is connected between the outlet of the oil pump and the oil tank.

As a further improvement, the oil supply control part further comprises a two-position four-way valve I, and the two-position four-way valve I is connected in parallel with two ends of the overflow valve I.

As a further improvement, the oil supply control part further comprises a two-position four-way valve II and a speed regulating valve, wherein the P port of the two-position four-way valve II is connected with the outlet of the oil pump, the T port of the two-position four-way valve II is connected with the oil tank, the A port of the two-position four-way valve II is cut off, and the B port of the two-position four-way valve II is connected to the oil tank through the speed regulating valve.

As a further improvement, a filter and a one-way valve I are arranged on a pipeline between the outlet of the oil pump and the P port of the three-position four-way valve I.

As a further improvement, the oil supply control part is provided with two oil pumps, and three pairs of oil cylinder control parts are correspondingly arranged to respectively control a pair of lower roller oil cylinders and two pairs of side roller oil cylinders, and the three oil cylinder control parts for controlling the lower roller oil cylinders and the side roller oil cylinders on the same side are supplied with oil by the same oil pump.

As a further improvement, a discharge control section is also included; the discharging control part comprises a three-position four-way valve II and a double-hydraulic control one-way valve, a P port of the three-position four-way valve II is connected with pressure oil of the oil supply control part, a T port of the three-position four-way valve II is connected with an oil tank, and an A port and a B port of the three-position four-way valve II are respectively connected with an upper cavity and a lower cavity of the turnover oil cylinder through the double-hydraulic control one-way valve.

As a further improvement, the discharging control part further comprises a sequence valve III and a one-way valve III, and the sequence valve III and the one-way valve III are arranged in parallel between the double-hydraulic control one-way valve and the lower cavity of the tipping oil cylinder.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) The split type four-roller corrugated plate bending machine breaks through the structure that the traditional rollers are fixed on the integral type frame, adopts a split type structure, one end of the upper roller is arranged on an independent top frame, and the top frame is detachably arranged on the frame through a tensioning mechanism, so that the assembly of the plate bending machine is greatly facilitated, the assembly efficiency is improved, the assembly speed is improved by 3-4 times compared with that of the traditional plate bending machine, and meanwhile, the probability of collision in the assembly process can be effectively reduced.

(2) The split type four-roller corrugated plate bending machine is characterized in that a tensioning mechanism locks a top frame by twisting a locking screw sleeve, an upper screw rod and a lower screw rod are pulled through positive and negative screw holes at two ends of the locking screw sleeve, the lower screw rod drives a swinging connecting rod to rotate, an eccentric locking pin shaft is driven to rotate, and a top frame pin shaft is tensioned through the tensioning connecting rod, so that the top frame is pressed above a frame; the structure design is simple and ingenious, the top frame can be reliably fixed on the frame, the top frame can be fastened for a long time without loosening under high pressure and high vibration environment, and the top frame is convenient to detach, so that the assembly of the plate bending machine is simpler and more convenient, and the welding difficulty of the frame can be reduced.

(3) Compared with the traditional mode that the oil cylinder drives the sliding blocks to drive the rollers to move up and down, the split four-roller corrugated plate bending machine has the advantages that the sliding blocks are omitted, the structure is more compact, the whole height of the plate bending machine is greatly reduced, and the weight of the whole machine is also reduced; on the other hand, the supporting contact surface is longer, the supporting stability of the lower roller and the side roller is improved, the upper and lower lifting operation of the lower roller and the side roller is ensured to be stable, and the precision requirement of the rolled workpiece is improved.

(4) The split type four-roller corrugated plate bending machine is characterized in that a supporting roller assembly is additionally arranged to support a lower roller and a side roller, so that stress in the length direction is balanced, two wedge blocks are simultaneously driven to move reversely through an adjusting screw rod, and inclined plane sliding is converted into vertical movement of a wheel seat, so that the height of a supporting wheel is adjusted to meet the requirement of rolling plates without thickness; the support roller assembly is ingenious and reasonable in structural design, and can avoid the problem that the radius of a rolled pipe or arc plate is gradually reduced from the middle to two ends due to the fact that the lower roller and the side rollers are slightly bent under the action of pressure in the process of rolling a workpiece, so that the radius of the rolled piece on the whole length is identical, and the machining precision is improved.

(5) The split type four-roller corrugated plate bending machine is assembled into the end faces of the lower roller support and the side roller support by using keys, and the corresponding two-way positioning structure design of the transverse key groove and the longitudinal key groove of the lower roller oil cylinder and the corresponding side roller oil cylinder is convenient to assemble, ensures the positioning accuracy, ensures the mounting positions of the lower roller and the side roller to be accurate, ensures that all axes are parallel, and improves the rolling quality.

(6) According to the split type four-roller corrugated plate bending machine, the material supporting structure is additionally arranged on the discharging side, the rolled workpiece is supported, the workpiece is prevented from being difficult to take down or fall, the material supporting structure can adjust the angles of the first material supporting frame and the second material supporting frame through the first material supporting oil cylinder and the second material supporting oil cylinder, so that the material supporting requirements of rolled parts with different radiuses are used, the rolled parts are greatly facilitated to be taken down from the plate bending machine, and the rolling operation safety is improved.

(7) The hydraulic system of the four-roller corrugated plate bending machine can realize the control of the up-and-down motion of the lower roller and the side roller of the plate bending machine, meets the requirements of plate bending with different thickness and radian, can ensure the synchronism of the motion of the lower roller or the two ends of the side roller of the plate bending machine, has the synchronous control precision of 0.3mm, has good positioning performance on the roller, is not easy to move or shake under the conditions of high roller pressure and high vibration, and ensures the stability of the rolling work.

(8) According to the hydraulic system of the four-roller corrugated plate bending machine, the unloading control part can stably put down the overturning bracket, so that a rolled round pipe is taken out conveniently, the overturning bracket can be ensured to stably support the upper roller, and the running stability of the upper roller is ensured.

Drawings

FIG. 1 is a schematic perspective view of a plate bending machine according to the present invention;

FIG. 2 is a schematic diagram of the front view of the plate bending machine according to the present invention;

FIG. 3 is a schematic view of a right-side view partially in cross-section of the veneer reeling machine of the present invention;

FIG. 4 is a rotational cross-sectional view of A-A of FIG. 3;

FIG. 5 is a schematic perspective view of an eccentric locking pin in the tensioning mechanism of the present invention;

FIG. 6 is a schematic perspective view of a side roller installation in accordance with the present invention;

FIG. 7 is a schematic perspective view of a side roller bracket according to the present invention;

FIG. 8 is a schematic diagram of the front view of a backup roll assembly of the present invention;

FIG. 9 is a schematic diagram of a left side view of a backup roll assembly of the present invention;

FIG. 10 is a cross-sectional view of B-B of FIG. 9;

FIG. 11 is a schematic diagram of a material supporting mechanism according to the present invention;

FIG. 12 is a schematic diagram of the hydraulic system of the veneer reeling machine of the present invention;

FIG. 13 is an enlarged view of part (1) of FIG. 12;

FIG. 14 is an enlarged view of the portion (2) of FIG. 12;

fig. 15 is an enlarged view of the portion (3) in fig. 12.

The reference numerals in the drawings are respectively:

1. an oil tank; 2. an oil pump; 3. a filter; 4. a one-way valve I; 5. an overflow valve I; 6. two-position four-way valve I; 7. two-position four-way valve II; 8. a speed regulating valve; 9. three-position four-way valve I; 10. a one-way valve II; 11. a sequence valve I; 12. a sequence valve II; 13. two-position two-way valve; 14. a hydraulic control one-way valve I; 15. a hydraulic control one-way valve II; 16. a two-position four-way valve III; 17. a three-position four-way valve II; 18. a double-pilot operated check valve; 19. a sequence valve III; 20. a one-way valve III; 21. an overflow valve II;

100. a base; 200. a frame; 210. a lower roller slot; 220 side roller slots; 300. an upper roller; 400. a lower roller; 410. a lower roller cylinder;

500. a side roller; 510. a side roller bracket; 511. a transverse keyway; 512. longitudinal key slot; 520. a side roller cylinder; 530. a side roller bearing block; 540. a backup roll assembly; 541. a support platform; 542. a wheel seat; 543. a support wheel; 544. wedge blocks; 545. adjusting a screw; 546. an adjusting nut;

600. a top frame;

700. a tensioning mechanism; 710. tensioning the connecting rod; 720. a top frame pin shaft; 730. eccentric locking pin shafts; 731. a polygonal end; 732. a journal; 733. an eccentric section; 740. swinging the connecting rod; 750. a lower screw; 760. a screw rod is arranged; 770. a locking screw sleeve;

800. Tipping the bracket; 810. overturning the oil cylinder;

900. a material supporting mechanism; 910. a first material supporting frame; 920. a second material supporting frame; 930. the first material supporting oil cylinder; 940. a second material supporting oil cylinder; 950. and a material supporting roller.

Detailed Description

The invention is further described below in connection with specific embodiments and the accompanying drawings.

Example 1

As shown in fig. 1, 2 and 3, the split type four-roll corrugated roll bending machine of the present embodiment mainly includes a base 100, a pair of frames 200, an upper roll 300, a lower roll 400, a pair of side rolls 500, a top frame 600 and a tightening mechanism 700. Wherein, a pair of frames 200 are disposed at opposite sides of the base 100, the base 100 and the frames 200 are formed by welding plates, a plurality of reinforcing ribs are provided inside thereof to reinforce their strength, the frames 200 are fixed to the base 100 by bolts, both ends of the lower roller 400 are respectively supported and disposed on the frames 200 by a lower roller cylinder 410, two side rollers 500 are respectively disposed at both sides of the lower roller 400, and both ends of the lower roller 400 are respectively supported and disposed on the frames 200 by a side roller cylinder 520.

In the conventional veneer reeling machine, the upper roller 300 is also directly installed on the frame, and the requirement on the supporting strength of the frame 200 for each roller is high because the pressure of the working roller of the veneer reeling machine is very high, so that the frame of the conventional veneer reeling machine adopts an integral structure, and corresponding holes are reserved on the frame so that the end parts of each roller are installed and supported. Although the integral frame structure is inherently strong, the following disadvantages are that the components such as each roller, the hydraulic cylinder, the corresponding bracket and the like are required to be installed in the installation holes on the frame, so that the components are slowly plugged into the corresponding installation holes from the side surface of the frame, the components are often larger and heavier, the components are required to be installed after being lifted by a crane and the like, the side-inserted installation mode is time-consuming and labor-consuming, the risk of collision is extremely easy to occur, the installation process is very careful, three and four people are often assembled together, the time is also spent for several days, and the production efficiency is seriously reduced. Moreover, when the whole round tube is rolled, one end of the upper roller 300 adopts a fixed support, and the other end adopts a reversible movable support in order to take down the tube; therefore, the traditional brackets on two sides are not symmetrical, but are high on one side and low on the other side, the welding difficulty is higher, and the accuracy of the installation position is not easy to control.

Based on the above, the upper roller 300 is not directly mounted to the frames 200 in the present embodiment, but one end of the upper roller 300 is mounted to one of the frames 200 through the turnover bracket 800, and the other end of the upper roller 300 is mounted to the other frame 200 through the top bracket 600. The upper end of the turnover support 800 is provided with a bearing hole, the end part of the upper roller 300 can be installed in the bearing hole through a bearing, the lower end of the turnover support 800 is hinged on the frame 200 through a pin shaft, the turnover support 800 can be driven to turn up and down through the turnover oil cylinder 810, namely, the lower end of the turnover oil cylinder 810 is hinged on the base 100, and the upper end is hinged with the turnover support 800, so that the turnover oil cylinder 810 can drive the turnover support 800 to turn up and down, and the turnover support 800 supports the upper roller 300 or is released, so that a rolled round tube can be taken out from the end. The other end of the upper roller 300 is also mounted in the top frame 600 through bearings, the top frame 600 is supported above the frame 200, and both ends thereof are detachably connected with the frame 200 through a tensioning mechanism 700, respectively. Therefore, the design of the top frame 600 makes the upper roller 300 not directly installed on the frame 200, and breaks through the traditional inherent structural form, at this time, the two frames 200 at two sides can be completely identical in mechanism part, so that the number of welding parts is reduced, uniform welding and uniform processing are facilitated, and welding and processing quality and accuracy are easily ensured; more importantly, when the whole machine is assembled, the components such as each roller, the oil cylinder and the like can be directly hoisted and installed from the upper part without being inserted from the side surface, so that the assembly is greatly facilitated, the assembly efficiency is improved, the assembly speed is improved by 3-4 times compared with the prior assembly speed, the mechanical part assembly of the whole machine can be completed by only one assembly worker, the labor force is saved, and the probability of collision in the assembly process can be effectively reduced.

The design of the top chassis 600 naturally brings the above advantages, but it is necessary to ensure the connection reliability of the top chassis 600 and the frame 200. In general, it is most conceivable to fix the top frame 600 to the frame 200 by using bolts, which is convenient and quick; however, the bolt is difficult to be applied here, and is easy to loosen and even be lengthened or broken due to the fact that the roll pressure and vibration of the plate bending machine are large, and the bolt is inconvenient to install.

Thus, the present embodiment specifically designs the tightening mechanism 700 to meet this particular connection requirement, and as shown in connection with fig. 3 and 4, the tightening mechanism 700 includes a tightening link 710, a swing link 740, and a locking screw 770; one end of the tensioning connecting rod 710 is connected with the top frame 600 through a top frame pin shaft 720, and the other end is connected with the frame 200 through an eccentric locking pin shaft 730; the top frame pin shaft 720 is hinged with one end of the upper screw 760; one end of the swing link 740 is connected with the eccentric locking pin shaft 730, and the other end is hinged with one end of the lower screw 750; the locking screw sleeve 770 has forward and reverse screw holes at both ends, which are respectively screw-connected with the other end of the upper screw 760 and the other end of the lower screw 750, and a wrench clamping plane is provided in the middle of the outer surface of the locking screw sleeve 770, so that the locking screw sleeve 770 can be rotated conveniently. As shown in fig. 5, the eccentric locking pin 730 includes, from one end to the other, a polygonal end 731, a positioning shoulder, a journal 732, an eccentric section 733, and a journal 732; wherein, the swinging connecting rod 740 has a hole matched with the polygonal end 731, so that the swinging connecting rod 740 can drive the eccentric locking pin 730 to rotate together, and the polygonal end 731 in the embodiment is a regular hexagon; the two journals 732 are supported on the frame 200 with the axis of the eccentric section 733 not coincident with the axis of the journals 732 and having an eccentricity such that rotation of the eccentric locking pin 730 pulls the tension link 710 downward.

The tensioning step of the tensioning mechanism 700 on the top frame 600 is as follows: the locking screw sleeve 770 is rotated, the front and back screw holes at the two ends of the locking screw sleeve 770 are in threaded transmission with the upper screw 760 and the lower screw 750, the upper screw 760 and the lower screw 750 are screwed into the locking screw sleeve 770, the lower screw 750 drives the swinging connecting rod 740 to rotate, the eccentric locking pin 730 is further driven to rotate, the top frame pin 720 is tensioned through the tensioning connecting rod 710, and therefore the top frame 600 is pressed above the frame 200. During the rolling process, the roller pressure and vibration force are radially applied to the eccentric locking pin 730 through the tension link 710, and the rotation torque is not generated to the eccentric locking pin 730, the locking screw sleeve 770 is not reversely rotated, and the top chassis 600 is not loosened. Therefore, the structure design is simple and ingenious, the top frame 600 can be reliably fixed on the frame 200, the top frame can be fastened for a long time without loosening under high pressure and high vibration environment, and the top frame is convenient to detach, so that the assembly of the plate bending machine is simpler and more convenient, and the welding difficulty of the frame 200 can be reduced.

Example 2

The split four-roller corrugated plate bending machine of the embodiment optimally designs the installation form of each roller on the basis of the embodiment 1. In the traditional veneer reeling machine, each roller is driven by an oil cylinder, namely the oil cylinder is connected with a sliding block, two ends of the roller are arranged on the sliding block, and in order to ensure the stability of up-and-down movement of each roller, the supporting surface of the sliding block has a certain length requirement, so that the height of a rack is higher, the weight of the whole machine is relatively heavier, and the manufacturing cost is also high.

To solve this problem, as shown in fig. 3, in this embodiment, a lower roller slot 210 and side roller slots 220 located at two sides of the lower roller slot 210 are formed on the frame 200, a lower roller cylinder 410 and a side roller cylinder 520 are respectively disposed in the lower roller slot 210 and the side roller slot 220, a piston rod of the lower roller cylinder 410 and a piston rod of the side roller cylinder 520 are hinged to the frame 200 through pins, and a cylinder body of the lower roller cylinder 410 and a cylinder body of the side roller cylinder 520 are respectively in sliding fit with two sides of the lower roller slot 210 and two sides of the side roller slot 220, and wear-resistant copper plates are adopted as the mating surfaces so as to reduce sliding friction and improve wear resistance. Compared with the traditional mode that the oil cylinder drives the sliding blocks to drive the rollers to move up and down, the structure is more compact, the whole height of the plate bending machine is greatly reduced, and the weight of the whole machine is also reduced; on the other hand, the support contact surface is longer, the support stability of the lower roller 400 and the side roller 500 is improved, the upper and lower lifting operation of the lower roller 400 and the side roller 500 is ensured to be stable, and the precision requirement of the rolled workpiece is improved.

Since the lower roller bracket and the side roller bracket 510 are also welded parts, they are long and heavy, and it is difficult to ensure the accuracy of the connection positions of both ends thereof with the oil cylinder in practical installation. Therefore, as shown in fig. 7, in this embodiment, transverse keyways 511 are provided at the ends of the lower roller support and the side roller support 510, longitudinal keyways 512 are provided on the upper and lower sides of the transverse keyways 511, and matching transverse keyways 511 and longitudinal keyways 512 are provided on the cylinders of the lower roller cylinder 410 and the side roller cylinder 520, and the cylinders of the lower roller support and the lower roller cylinder 410 are positioned and matched by the keys fitted into the transverse keyways 511 and the transverse keyways 511, and the cylinders of the side roller support 510 and the side roller cylinder 520 are positioned and matched. The bidirectional positioning structure design is convenient to assemble, ensures positioning accuracy, ensures that the installation positions of the lower roller 400 and the side roller 500 are accurate, ensures that all axes are parallel, and improves rolling quality.

The lower roller 400 and the side roller 500 are supported at both ends, which inevitably results in weaker supporting force in the middle, particularly, a thicker plate is rolled under the rolling pressure of rolling, and the middle of the lower roller 400 and the side roller 500 inevitably bends slightly downwards, so that the radius of a rolled round tube or circular arc plate is gradually reduced from the middle to both ends, the quality of a rolled product is seriously influenced, and the service life of the roller is also adversely influenced. For this reason, in this embodiment, the supporting roller assembly 540 is added to support the lower roller 400 and the side roller 500 from below, and as shown in fig. 2, 6 and 7, both ends of the side roller 500 are respectively installed in the side roller bearing housing 530 through bearings, the side roller bearing housing 530 is fixed on the side roller bracket 510, and both ends of the side roller bracket 510 are connected with the cylinder body of the side roller cylinder 520; similarly, a lower roller bracket is arranged between the two lower roller cylinders 410, two ends of the lower roller bracket are connected with the cylinder body of the lower roller cylinder 410, and as the lower roller 400 needs power driving, the lower roller 400 is not arranged on the lower roller bracket, but the cylinder body of the lower roller cylinder 410 is provided with a bearing hole, two ends of the lower roller 400 are arranged in the bearing hole on the cylinder body of the lower roller cylinder 410 through bearings, and one end of the lower roller 400 extends out of the outer side of the lower roller cylinder 410 and is connected with a speed reducing motor; the supporting roller assemblies 540 are installed on the lower roller support and the side roller support 510, and each lower roller support and side roller support 510 is provided with two supporting roller assemblies 540, which are supported from the symmetrical positions of the two sides in the middle of the lower part of the roller, and have upward supporting force to the roller, so as to prevent the middle of the roller from bending downwards and micro-deforming.

The direction of compression of the roller is identical to the direction of movement of the cylinders, i.e., the direction of bending of the roller is identical to the direction of movement of the cylinders, which requires the supporting force of the supporting roller assembly 540 to be identical to the direction of movement of the cylinders, or else effective deformation prevention cannot be performed. As shown in fig. 8, 9 and 10, the support roller assembly 540 includes a support platform 541, a wheel mount 542 and an adjustment screw 545 disposed on the lower roller bracket or side roller bracket 510; wherein, a pair of supporting wheels 543 are arranged on the wheel seat 542 through a shaft, the supporting wheels 543 are contacted with the lower roller 400 or the side roller 500, and are supported from two sides below the lower roller 400 or the side roller 500, and the bottom of the wheel seat 542 is provided with inclined surfaces with two symmetrical sides; a pair of wedges 544 are arranged between the wheel seat 542 and the supporting platform 541, the upper surfaces of the wedges 544 are inclined planes, and the inclined planes of the two wedges 544 are respectively matched with the two inclined planes at the bottom of the wheel seat 542; the two ends of the adjusting screw 545 are respectively connected with two adjusting nuts 546 arranged in the wedges 544, so that the adjusting screw 545 can be rotated to drive the two wedges 544 to move in opposite directions or in opposite directions at the same time, and the height of the supporting wheel 543 can be adjusted.

In order to ensure that the position of the rear wheel seat 542 is regulated by the regulating screw 545 to be fixed, the wheel seat 542 is required to be fixed on the supporting platform 541, so that a T-shaped groove is arranged on the supporting platform 541, a bolt hole is arranged on the wheel seat 542, a waist-shaped hole is arranged on the corresponding wedge 544, the bolt hole and the waist-shaped hole are sequentially penetrated through by bolts, and the T-shaped groove is inserted and then fastened by nuts. The waist-shaped holes of the wedge 544 are designed to accommodate the movement requirements of the wedge 544. In specific adjustment, the adjusting screw 545 is rotated to drive the two wedges 544 to move in opposite directions or in opposite directions simultaneously, so as to drive the supporting wheel 543 to squeeze or loosen the lower roller 400 or the side roller 500. The supporting roller assembly 540 has ingenious and reasonable structural design, and can avoid the problem that the radius of a rolled pipe or arc plate gradually reduces from the middle to two ends due to slight bending of the middle of the lower roller 400 and the side roller 500 under the action of pressure in the process of rolling a workpiece, ensure that the radius of a rolled piece is the same on the whole length, and improve the processing precision.

Example 3

The split four-roller corrugated plate bending machine of the embodiment is further improved on the basis of the embodiment 1 or 2 so as to facilitate the removal of coiled parts.

When the whole round pipe is rolled, the turnover oil cylinder 810 drives the turnover bracket 800 to turn down so as to open one end of the upper roller 300, thereby removing the work piece; when the arc plate is rolled, the workpiece is directly taken down from the discharging side for convenience and rapidness; however, since the arc plate has no reliable force point and is easy to slide, after the rolling is completed, if the lower roller cylinder 410 and the side roller cylinder 520 directly drive the lower roller 400 and the side roller 500 to move down to release the workpiece, the workpiece can directly slide between the upper roller 300 and the lower roller 400, so that the workpiece is difficult to take out, or the roller continues to roll, and the workpiece directly falls to the ground; if the end of the workpiece is not loosened, the workpiece is pinched between the upper roller 300 and the lower roller 400, and it is still difficult to go out.

In order to solve the above problem, in this embodiment, a material supporting mechanism 900 is added on the discharging side of the plate bending machine, so as to facilitate blanking. As shown in connection with fig. 1, 3 and 11, the material supporting mechanism 900 includes a first material supporting frame 910, a second material supporting frame 920, a first material supporting cylinder 930 and a second material supporting cylinder 940; one end of the first material supporting frame 910 is hinged with the frame 200, and the other end of the first material supporting frame 910 is hinged with one end of the second material supporting frame 920; the first material supporting frame 910 is driven by the first material supporting oil cylinder 930, that is, the upper end of the first material supporting oil cylinder 930 is connected with the first material supporting frame 910, and the lower end of the first material supporting oil cylinder 930 is hinged on the base 100; a second material supporting cylinder 940 is arranged between the first material supporting frame 910 and the second material supporting frame 920, namely two ends of the second material supporting cylinder 940 are respectively connected with the first material supporting frame 910 and the second material supporting frame 920; the first material supporting frame 910 is provided with a material supporting roller 950 at each end, and the second material supporting frame 920 is provided with a material supporting roller 950 at one end far away from the first material supporting frame 910.

After the rolling is completed, the angles of the first material supporting frame 910 and the second material supporting frame 920 are adjusted by controlling the first material supporting oil cylinder 930 and the second material supporting oil cylinder 940, so that the three material supporting rollers 950 are in contact with the surface of the workpiece, thereby forming three-point stable support and facilitating the removal of the processed workpiece.

Example 4

As shown in fig. 12, a hydraulic system of the four-roller corrugated plate bending machine in the embodiment controls a lower roller 400 and a side roller 500 of the plate bending machine in the embodiment 2 to meet the requirements of plate bending with different thickness and different radians, and the system mainly comprises three parts, namely an oil supply control part, an oil cylinder control part and a discharge control part; the oil supply control part is used for providing pressure oil for the oil cylinder control part and the discharging control part and controlling the oil pressure, the oil cylinder control part is used for controlling the actions of the lower roller oil cylinder 410 or the side roller oil cylinder 520, adjusting the positions of the lower roller 400 and the side roller 500 to meet the rolling requirement, and the discharging control part is used for controlling the overturning action of the overturning bracket 800 so as to realize the support of the upper roller 300 and the taking out of the rolled product workpiece. These three parts are described in detail below.

As shown in fig. 12 and 13, the oil supply control portion includes the oil pump 2, the relief valve i 5, the two-position four-way valve i 6, the two-position four-way valve ii 7, and the speed regulating valve 8; the two oil pumps 2 are used for supplying pressure, namely, a double pump is adopted, the inlet of each oil pump 2 is connected with the oil tank 1, the outlet of the oil pump 2 is connected with the oil cylinder control part, pressure oil is supplied to the oil cylinder control part, and the overflow valve I5 is connected between the outlet of the oil pump 2 and the oil tank 1, so that the safety of the system pressure is ensured; the two-position four-way valve I6 is connected in parallel with two ends of the overflow valve I5, namely the P port and the A port of the two-position four-way valve I6 are disconnected, other oil ways are not connected, the B port of the two-position four-way valve I6 is connected with the inlet of the overflow valve I5, the T port of the two-position four-way valve I6 is connected with the outlet of the overflow valve I5, namely the oil tank 1, and the two-position four-way valve I6 can realize pressure relief of the system; the P port of the two-position four-way valve II 7 is connected with the outlet of the oil pump 2, the T port of the two-position four-way valve II 7 is connected with the oil tank 1, the A port of the two-position four-way valve II 7 is cut off, namely, no other oil way is connected, the B port of the two-position four-way valve II 7 is connected with the oil tank 1 through the speed regulating valve 8, all oil ports of the electromagnet of the two-position four-way valve II 7 are disconnected when the electromagnet is not electrified, and the speed of the lower roller oil cylinder 410 or the side roller oil cylinder 520 can be controlled through the cooperation of the two-position four-way valve II 7 and the speed regulating valve 8. In addition, be provided with filter 3 and check valve I4 on the pipeline between the export of oil pump 2 and the P mouth of three-position cross valve I9, filter 3 can filter fluid, guarantees the cleanliness of system's hydraulic oil, and check valve I4 can prevent that hydraulic oil from flowing back to oil pump 2, plays the guard action to oil pump 2.

Referring to fig. 12 and 14, the cylinder control part includes a three-position four-way valve i 9, a check valve ii 10, a sequence valve i 11, a sequence valve ii 12, a two-position two-way valve 13, a pilot operated check valve i 14, a pilot operated check valve ii 15, and a two-position four-way valve iii 16; the middle position function of the three-position four-way valve I9 is Y-shaped, the P port of the three-position four-way valve I9 is connected with pressure oil of an oil supply control part, namely, the P port of the three-position four-way valve I9 is connected with an outlet of a one-way valve I4, the T port of the three-position four-way valve I9 is connected with an oil tank 1, the A port of the three-position four-way valve I9 is connected with an inlet of a one-way valve II 10, the outlet of the one-way valve II 10 is connected with a lower cavity of a lower roller oil cylinder 410 or a lower cavity of a side roller oil cylinder 520, the B port of the three-position four-way valve I9 is connected with an outlet of a sequence valve II 12, and the inlet of the sequence valve II 12 is connected with an upper cavity of the lower roller oil cylinder 410 or an upper cavity of the side roller oil cylinder 520; the sequence valve I11 is connected in parallel with two ends of the one-way valve II 10, the inlet of the sequence valve I11 is connected with the outlet of the one-way valve II 10, the inlet of the sequence valve I11 is connected with the one-way valve II 10, and a balance valve is formed by the cooperation of the one-way valve II 10 and the sequence valve I11, so that the descending of the lower roller 400 or the side roller 500 is slower and stable, and the impact is avoided; the P port of the two-position two-way valve 13 is connected with the outlet end of the sequence valve II 12, the A port of the two-position two-way valve 13 is connected with the inlet end of the sequence valve II 12, and when the electromagnet of the two-position two-way valve 13 is in power failure, the electromagnet is in one-way conduction from the P port to the A port, and the rapid ascending and the slow steady ascending of the lower roller 400 or the side roller 500 can be realized through the cooperation of the sequence valve II 12 and the two-position two-way valve 13.

In addition, the hydraulic control one-way valve I14 is arranged between the sequence valve II 12 and the lower roller cylinder 410 or the side roller cylinder 520, the hydraulic control one-way valve II 15 is arranged between the one-way valve II 10 and the lower roller cylinder 410 or the side roller cylinder 520, the control oil ports of the hydraulic control one-way valve I14 and the hydraulic control one-way valve II 15 are both connected with the port B of the two-position four-way valve III 16, the port P of the two-position four-way valve III 16 is connected with pressure oil of an oil supply control part, namely connected with the outlet of the one-way valve I4, the port T of the two-position four-way valve III 16 is connected with an oil tank, and the port A of the two-position four-way valve III 16 is blocked, namely not connected with other oil paths; through two-position four-way valve III 16 cooperation pilot operated check valve I14 and pilot operated check valve II 15, after lower roll 400 or side roller 500 moves in place, can lock lower roll 400 or side roller 500 position, prevent to take place to remove and shake in the coiling process, guarantee stability and the precision of coiling. In this embodiment, the outlet of the pilot operated check valve i 14 is connected to the oil tank 1 through the relief valve ii 21, and overflows when the upper top pressure of the lower roller 400 or the side roller 500 exceeds the required pressure, so as to ensure the stability of the top pressure.

In this embodiment, the two oil pumps 2 of the oil supply control portion correspond to three pairs of oil cylinder control portions, respectively, the three pairs of oil cylinder control portions control the actions of the pair of lower roll oil cylinders 410 and the pair of side roll oil cylinders 520, respectively, and the three oil cylinder control portions controlling the same side, such as the left or right side lower roll oil cylinder 410 and the side roll oil cylinder 520 of the veneer reeling machine, are supplied with oil from the same oil pump 2, which is advantageous in ensuring pressure stability at both ends of the roll and synchronization of movement at both ends of the roll.

As shown in fig. 12 and 15, the discharge control part comprises a three-position four-way valve ii 17, a double-pilot check valve 18, a sequence valve iii 19 and a check valve iii 20; the middle position function of the three-position four-way valve II 17 is Y-shaped, the P port of the three-position four-way valve II 17 is connected with pressure oil of an oil supply control part, the T port of the three-position four-way valve II 17 is connected with an oil tank 1, and the A port and the B port of the three-position four-way valve II 17 are respectively connected with an upper cavity and a lower cavity of the turnover oil cylinder 810 through a double-hydraulic control one-way valve 18, so that when the turnover support 800 is driven to stand up to support the upper roller 300, the double-hydraulic control one-way valve 18 can lock the position of the turnover oil cylinder 810, and the stability of the support is ensured; the sequence valve III 19 and the check valve III 20 are arranged in parallel between the double hydraulic control check valve 18 and the lower cavity of the tipping cylinder 810, so that the tipping bracket 800 is slow and stable in the tipping process.

The motion control of the lower roll 400 and the side rolls 500 of the plate bending machine can be realized by the system, and the motion control is specifically as follows:

when the lower roller 400 or the side roller 500 needs to be pushed upwards, the electromagnet of the two-position four-way valve I6 is powered on, the electromagnet of the two-position four-way valve II 7 is powered off, the electromagnet of the three-position four-way valve I9 is powered on, the electromagnet of the two-position four-way valve III 16 is powered on, hydraulic oil pumped out by the oil pump 2 enters the lower cavity of the lower roller cylinder 410 or the lower cavity of the side roller cylinder 520 through the three-position four-way valve I9 and the one-way valve II 10 to push the lower roller 400 or the side roller 500 upwards, and hydraulic oil in the upper cavity of the lower roller cylinder 410 or the upper cavity of the side roller cylinder 520 flows through the sequence valve II 12 and the two-position two-way valve 13, at the moment, if the electromagnet of the two-position two-way valve 13 is powered on, the lower roller 400 or the side roller 500 rapidly ascends, and if the electromagnet of the two-position two-way valve 13 is powered off, the lower roller 400 or the side roller 500 slowly and stably ascends;

After the lower roller 400 or the side roller 500 moves in place, the electromagnet of the two-position four-way valve III 16 is powered off, the electromagnet of the two-position four-way valve I6 is powered off, the system is decompressed, the lower roller cylinder 410 or the side roller cylinder 520 is free from pressure oil input, the position of the lower roller 400 or the side roller 500 is locked by the hydraulic control one-way valve I14 and the hydraulic control one-way valve II 15, stable support can be carried out, and vibration of the roller cannot occur;

when the lower roller 400 or the side roller 500 descends, the electromagnet of the two-position four-way valve I6 is powered on, the electromagnet of the two-position four-way valve II 7 is powered off, the electromagnet on the left side of the three-position four-way valve I9 is powered on, the electromagnet of the two-position four-way valve III 16 is powered on, hydraulic oil pumped by the oil pump 2 enters the upper cavity of the lower roller cylinder 410 or the upper cavity of the side roller cylinder 520 through the three-position four-way valve I9, the two-position two-way valve 13 and the hydraulic control one-way valve I14, and hydraulic oil in the lower cavity of the lower roller cylinder 410 or the lower cavity of the side roller cylinder 520 flows into the oil tank 1 through the hydraulic control one-way valve II 15, the sequence valve I11 and the three-position four-way valve I9, so that the stable descending of the lower roller 400 or the side roller 500 is realized;

when the running speed of the lower roller 400 or the side roller 500 needs to be adjusted, the electromagnet of the two-position four-way valve II 7 is electrified, and the running speed of the lower roller cylinder 410 or the side roller cylinder 520 can be changed by adjusting the speed regulating valve 8, so that the speed adjustment of the lower roller 400 or the side roller 500 is realized;

When the rolled finished round tube is required to be removed, the electromagnet on the right side of the three-position four-way valve II 17 is electrified, hydraulic oil enters the upper cavity of the turnover oil cylinder 810 through the three-position four-way valve II 17 and the double-hydraulic control one-way valve 18, and hydraulic oil in the lower cavity of the turnover oil cylinder 810 flows back to the oil tank 1 through the sequence valve III 19, the double-hydraulic control one-way valve 18 and the three-position four-way valve II 17, so that the turnover oil cylinder 810 drives the turnover support 800 to turn downwards, the end part of the upper roller 300 is opened, and a workpiece can be removed.

From the above, the system of the embodiment can realize the control of the up-and-down motion of the lower roller 400 and the side roller 500 of the plate bending machine, and meet the requirements of plate bending with different thickness and radian.

The examples of the present invention are merely for describing the preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and those skilled in the art should make various changes and modifications to the technical solution of the present invention without departing from the spirit of the present invention.

Claims

1. The hydraulic system of the four-roller corrugated plate bending machine comprises an oil supply control part and an oil cylinder control part, wherein the oil supply control part is used for providing hydraulic oil for the oil cylinder control part, and the oil cylinder control part is used for controlling the action of a lower roller oil cylinder (410) or a side roller oil cylinder (520), and is characterized in that: the oil cylinder control part comprises a three-position four-way valve I (9), a one-way valve II (10), a sequence valve I (11), a sequence valve II (12) and a two-position two-way valve (13), wherein the P port of the three-position four-way valve I (9) is connected with pressure oil of the oil supply control part, the T port of the three-position four-way valve I (9) is connected with an oil tank (1), the A port of the three-position four-way valve I (9) is connected with an inlet of the one-way valve II (10), an outlet of the one-way valve II (10) is connected with a lower cavity of a lower roller oil cylinder (410) or a lower cavity of a side roller oil cylinder (520), and the B port of the three-position four-way valve I (9) is connected with an outlet of the sequence valve II (12), and the inlet of the sequence valve II (12) is connected with an upper cavity of the lower roller oil cylinder (410) or an upper cavity of the side roller oil cylinder (520); the sequence valve I (11) is connected in parallel with two ends of the one-way valve II (10); the P port of the two-position two-way valve (13) is connected with the outlet end of the sequence valve II (12), and the A port of the two-position two-way valve (13) is connected with the inlet end of the sequence valve II (12).

2. The hydraulic system of a four-roll corrugated sheet bending machine as defined in claim 1, wherein: the oil cylinder control part further comprises a hydraulic control one-way valve I (14), a hydraulic control one-way valve II (15) and a two-position four-way valve III (16), wherein the hydraulic control one-way valve I (14) is arranged between the sequence valve II (12) and the upper cavity of the lower roller oil cylinder (410) or the upper cavity of the side roller oil cylinder (520), the hydraulic control one-way valve II (15) is arranged between the one-way valve II (10) and the lower cavity of the lower roller oil cylinder (410) or the lower cavity of the side roller oil cylinder (520), control oil ports of the hydraulic control one-way valve I (14) and the hydraulic control one-way valve II (15) are connected with the B port of the two-position four-way valve III (16), the P port of the two-position four-way valve III (16) is connected with pressure oil of the oil supply control part, the T port of the two-position four-way valve III (16) is connected with the oil tank, and the A port of the two-position four-way valve III (16) is disconnected.

3. The hydraulic system of a four-roll corrugated sheet bending machine as defined in claim 2, wherein: the outlet of the hydraulic control one-way valve I (14) is connected to the oil tank (1) through the overflow valve II (21).

4. The hydraulic system of a four-roll corrugated sheet bending machine as defined in claim 1, wherein: the oil supply control part comprises an oil pump (2) and an overflow valve I (5), wherein an inlet of the oil pump (2) is connected with the oil tank (1), an outlet of the oil pump (2) is connected with a P port of a three-position four-way valve I (9), and the overflow valve I (5) is connected between an outlet of the oil pump (2) and the oil tank (1).

5. The hydraulic system of the four-roll corrugated sheet bending machine according to claim 4, wherein: the oil supply control part further comprises a two-position four-way valve I (6), and the two-position four-way valve I (6) is connected in parallel with two ends of the overflow valve I (5).

6. The hydraulic system of the four-roll corrugated sheet bending machine according to claim 5, wherein: the oil supply control part further comprises a two-position four-way valve II (7) and a speed regulating valve (8), wherein the P port of the two-position four-way valve II (7) is connected with the outlet of the oil pump (2), the T port of the two-position four-way valve II (7) is communicated with the oil tank (1), the A port of the two-position four-way valve II (7) is disconnected, and the B port of the two-position four-way valve II (7) is connected to the oil tank (1) through the speed regulating valve (8).

7. A hydraulic system of a four-roll corrugated sheet bending machine according to claim 4 or 5 or 6, wherein: a filter (3) and a one-way valve I (4) are arranged on a pipeline between an outlet of the oil pump (2) and a P port of the three-position four-way valve I (9).

8. A hydraulic system of a four-roll corrugated sheet bending machine according to claim 4 or 5 or 6, wherein: the oil supply control part is provided with two oil pumps (2), three pairs of oil cylinder control parts are correspondingly arranged, the three pairs of oil cylinder control parts respectively control a pair of lower roller oil cylinders (410) and two pairs of side roller oil cylinders (520), and the three oil cylinder control parts controlling the lower roller oil cylinders (410) and the side roller oil cylinders (520) on the same side are supplied with oil by the same oil pump (2).

9. A hydraulic system of a four-roll corrugated sheet bending machine according to claim 1 or 2, wherein: the device also comprises a discharging control part; the discharging control part comprises a three-position four-way valve II (17) and a double-hydraulic control one-way valve (18), wherein the P port of the three-position four-way valve II (17) is connected with pressure oil of the oil supply control part, the T port of the three-position four-way valve II (17) is connected with the oil tank (1), and the A port and the B port of the three-position four-way valve II (17) are respectively connected with the upper cavity and the lower cavity of the overturning oil cylinder (810) through the double-hydraulic control one-way valve (18).

10. The hydraulic system of a four-roll corrugated sheet bending machine as recited in claim 9, wherein: the discharging control part further comprises a sequence valve III (19) and a one-way valve III (20), and the sequence valve III (19) and the one-way valve III (20) are arranged in parallel between the double hydraulic control one-way valve (18) and the lower cavity of the turnover oil cylinder (810).