CN117189702A - Hydraulic system of bending machine - Google Patents

Abstract

The application discloses a hydraulic system of a bending machine, which comprises an oil tank, an oil pump, a first oil cylinder and a second oil cylinder, wherein the oil pump is provided with an oil suction port and an oil outlet; the second oil cylinder is connected with a second pipeline, a third one-way valve is connected between the second pipeline and the oil tank, a fourth pipeline is connected between the second pipeline and the oil outlet, and the fourth pipeline is provided with a fourth stop valve; a stop structure is connected between the oil outlet and the oil tank. The folding plate mould moves in a first stroke and a second stroke, the folding plate mould does not contact with the steel plate in the first stroke, does not need to bear the reaction force of the steel plate, and bends when contacting with the steel plate in the second stroke.

Description

Hydraulic system of bending machine

Technical Field

The application relates to the technical field of hydraulic pressure, in particular to a hydraulic system of a bending machine.

Background

The bending machine presses and bends the steel plate through the hydraulic system, and the steel plate with larger thickness is bent and needs to output larger pressure, so that the diameter of the oil cylinder is larger, and in order to be stressed uniformly, a plurality of oil cylinders are generally required to be arranged for applying force to the folded plate mould, then the folded plate mould applies force to the steel plate to bend, the oil pump is required to supply oil to the oil cylinders with a plurality of large diameters, the extending speed of the piston rods of the oil cylinders is lower, the moving speed of the folded plate mould is lower, and the production efficiency is lower.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a hydraulic system of a bending machine.

According to the hydraulic system of the bending machine, which is disclosed by the embodiment of the application, the hydraulic system comprises an oil tank, an oil pump, a first oil cylinder and a second oil cylinder, wherein the oil pump is provided with an oil suction port and an oil outlet, the oil suction port is communicated with the oil pump, and a first pipeline is connected between the oil outlet and the first oil cylinder; the second oil cylinder is connected with a second pipeline, a third one-way valve is connected between the second pipeline and the oil tank, a fourth pipeline is connected between the second pipeline and the oil outlet, and the fourth pipeline is provided with a fourth stop valve; a stop structure is connected between the oil outlet and the oil tank.

According to the hydraulic system of the bending machine, at least the following technical effects are achieved: the folding plate mould moves in a first stroke and a second stroke, the folding plate mould does not contact with the steel plate in the first stroke, does not need to bear the reaction force of the steel plate, and bends when contacting with the steel plate in the second stroke. When the oil pump is started, the stop structure is regulated to a stop state, in one stroke, the fourth stop valve is regulated to the stop state, hydraulic oil output by the oil pump only needs to be supplied to the first oil cylinder, the first oil cylinder can push the folded plate mould to quickly approach the steel plate, and at the moment, the hydraulic oil required to be supplemented by the second oil cylinder can flow from the oil tank to the second oil cylinder after passing through the third one-way valve; in the second-stage stroke, the fourth stop valve is adjusted to be in a conducting state, hydraulic oil output by the oil pump is supplied to the first oil cylinder and the second oil cylinder, and enough pressure is generated to bend the steel plate.

According to some embodiments of the application, an eighth relief valve is connected between the oil outlet and the oil tank. Therefore, the pressure at the oil outlet can be controlled, and the hydraulic system is prevented from being damaged due to the fact that the pressure at the oil outlet is too high.

According to some embodiments of the application, a sixth check valve is connected between the second pipe and the oil outlet. When bending is carried out, if the reaction force is too large, the hydraulic oil at the second pipeline can be decompressed through the sixth one-way valve, so that the hydraulic system is prevented from being damaged.

According to some embodiments of the application, the fourth shut-off valve is a one-way shut-off valve. In one stroke, if the folded plate mould reaches too large reaction force due to emergency, the hydraulic oil at the second pipeline can be decompressed through the fourth stop valve, so that the hydraulic system is prevented from being damaged.

According to some embodiments of the application, the fourth shut-off valve is an electronically controlled check valve. This facilitates the control of the fourth shut-off valve.

According to some embodiments of the application, the first line is provided with a first electrically controlled one-way valve. Therefore, in the feeding process, the stop mechanism can be adjusted to be in a conducting state to stop the action, and the first electric control one-way valve can play a role of locking, so that the folded plate die stays at the current position, and the stop mechanism can be adjusted to be in a stop state when the feeding is needed to be continued.

According to some embodiments of the application, the first cylinder is a double stroke cylinder, the first cylinder has a first piston chamber and a second piston chamber, and the first piston chamber and the second piston chamber are connected with the first pipeline and the second pipeline respectively. In the two-section stroke, the first oil cylinder can also provide thrust for the folding die, and the stress of the folding die is more uniform.

According to some embodiments of the application, a manual shut-off valve is connected between the tank and the outlet. Through setting up manual stop valve, when meetting the trouble and leading to the unable normal return stroke of folded plate mould to original position, can stop the oil pump before the maintenance, make manual stop valve switch on, then first hydro-cylinder and second hydro-cylinder all can the pressure release, after the folded plate mould descends to safe position, carry out the maintenance again and get rid of the trouble.

According to some embodiments of the application, the shut-off structure comprises a two-position four-way reversing valve, wherein a port P and a port A of the two-position four-way reversing valve are communicated with the oil outlet, and a port T and a port B of the two-position four-way reversing valve are communicated with the oil tank. The two-position four-way reversing valve has smaller hydraulic impact and reduces the failure occurrence rate of the stop structure.

According to some embodiments of the application, the fourth line is provided with a throttle valve. Thus, the feeding speed of the folded plate mould in the two-stage travel can be controlled by the throttle valve so as to adapt to the actual requirements of the production field.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a bender hydraulic system according to an embodiment of the present application.

In the accompanying drawings:

100-an oil pump; 110-an oil tank; 120-manual shut-off valve; 130-two-position four-way reversing valve; 140-eighth overflow valve; 150-a sixth one-way valve; 160-a third one-way valve; 170-fourth electric control one-way valve; 180-throttle valve; 190-a first overflow valve; 200-a first electric control one-way valve; 210-a first oil cylinder; 220-a second oil cylinder.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, only for convenience of description and simplification of the description, and are not intended to indicate that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Further, the meaning of a plurality is one or more, and the meaning of a plurality is two or more, and greater than, less than, exceeding, etc. is understood to exclude the present number, and the meaning of above, below, within, etc. is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

A hydraulic system of a bending machine according to an embodiment of the present application is described below with reference to fig. 1.

The hydraulic system of the bending machine comprises an oil tank 110, an oil pump 100, a first oil cylinder 210 and a second oil cylinder 220, wherein the oil pump 100 is provided with an oil suction port and an oil outlet, the oil suction port is communicated with the oil pump 100, and a first pipeline is connected between the oil outlet and the first oil cylinder 210; the second oil cylinder 220 is connected with a second pipeline, a third pipeline is connected between the second pipeline and the oil tank 110, a third one-way valve 160 is arranged on the third pipeline in series, the conduction direction of the third one-way valve 160 is the direction from the oil pump 100 to the second oil cylinder 220, a fourth pipeline is connected between the second pipeline and the oil outlet, and a fourth stop valve is arranged on the fourth pipeline in series; a fifth pipeline is connected between the oil outlet and the oil tank 110, and the fifth pipeline is provided with a stop structure.

It should be noted that the movement of the folded plate mold has a first stroke and a second stroke, the folded plate mold does not contact the steel plate in the first stroke, does not need to bear the reaction force of the steel plate, and the folded plate mold contacts the steel plate and bends in the second stroke. When the oil pump 100 is started and the stop structure is regulated to the stop state, in one stroke, the fourth stop valve is regulated to the stop state, hydraulic oil output by the oil pump 100 only needs to be supplied to the first oil cylinder 210, the first oil cylinder 210 can push the folded plate mould to quickly approach the steel plate, and at the moment, the hydraulic oil required to be supplemented by the second oil cylinder 220 can flow from the oil tank 110 to the second oil cylinder 220 through the third one-way valve 160; in the second stroke, the fourth stop valve is adjusted to be in an on state, and the hydraulic oil output by the oil pump 100 is supplied to the first oil cylinder 210 and the second oil cylinder 220, so that enough pressure is generated to bend the steel plate. After bending is completed, the stop structure and the fourth stop valve are both adjusted to be in a conducting state, the hydraulic system is used for pressure relief, and the folded plate die can return to the original position.

The first oil cylinder 210 and the second oil cylinder 220 can be single-acting oil cylinders, namely, the first oil cylinder 210 and the second oil cylinder 220 are both provided with an oil receiving port, a first pipeline is connected to the oil receiving port of the first oil cylinder 210, a second pipeline is connected to the oil receiving port of the second oil cylinder 220, oil supply to the oil receiving port can realize the extension of the first oil cylinder 210 and the second oil cylinder 220, the first oil cylinder 210 and the second oil cylinder 220 are vertically arranged, piston rods of the first oil cylinder 210 and piston rods of the second oil cylinder 220 extend upwards and are connected to a folded plate mold together, and when the oil receiving port is communicated to the oil tank 110, the folded plate mold and the piston rods move downwards under the action of gravity, and hydraulic oil is discharged from the oil receiving port. Of course, the first cylinder 210 and the second cylinder 220 may be double-acting cylinders, and an additional oil path is provided for the return stroke of the first cylinder 210 and the second cylinder 220, so that the first cylinder 210 and the second cylinder 220 may not be vertically arranged because gravity return stroke is not required.

In some embodiments of the present application, an eighth relief valve 140 is connected between the oil outlet and the oil tank 110. An eighth pipeline is further connected between the oil outlet and the oil tank 110, the eighth pipeline is provided with an eighth overflow valve 140, and the overflow direction of the eighth overflow valve 140 is the direction of flowing to the oil tank 110, so that the pressure at the oil outlet can be controlled, and the hydraulic system is prevented from being damaged due to overlarge pressure at the oil outlet.

In some embodiments of the application, a sixth check valve 150 is connected between the second conduit and the outlet. A sixth pipeline is connected between the second pipeline and the oil outlet, and the sixth pipeline is provided with a sixth one-way valve 150. When bending is performed like this, if the reaction force received is too large, the hydraulic oil at the second pipeline can be decompressed through the sixth one-way valve 150, so that the hydraulic system is prevented from being damaged. In particular, when the fourth pipeline is provided with the throttle valve 180, the pressure relief from the sixth pipeline is not limited by the throttle valve 180, and the pressure relief speed can be prevented from being too slow.

In some embodiments of the application, the fourth shut-off valve is a one-way shut-off valve. The fourth stop valve is provided with two gears, namely a fourth first gear and a fourth second gear, wherein in the fourth gear, a fourth pipeline is conducted in a bidirectional manner; in the fourth second gear, the fourth pipeline is conducted in the direction from the second pipeline to the oil outlet and is cut off in the direction from the oil outlet to the second pipeline; in one stroke, if the folded plate mould reaches too large reaction force due to emergency, the hydraulic oil at the second pipeline can be decompressed through the fourth stop valve, so that the hydraulic system is prevented from being damaged. The fourth shut-off valve may be a manually controlled or an electrically operated one-way shut-off valve.

In some embodiments of the application, the fourth shut-off valve is an electronically controlled check valve. The fourth shut-off valve is referred to as a fourth electronically controlled check valve 170, which facilitates control of the fourth shut-off valve.

In some embodiments of the application, the first conduit is provided with a first electronically controlled one-way valve 200. The first electrically controlled check valve 200 has two gears, respectively referred to as a first gear and a first second gear, in which the first pipe is bi-directionally conductive; in the first second gear, the first pipeline is turned on in the direction from the oil outlet to the first oil cylinder 210, and the first oil cylinder 210 is turned off in the direction from the oil outlet to the oil outlet. When the first oil cylinder 210 is required to feed, the first electric control check valve 200 is regulated to a first one-gear or a first two-gear, when the first oil cylinder 210 is required to release pressure, the first electric control check valve 200 is regulated to the first one-gear, and when the first oil cylinder 210 is required to be locked, the first electric control check valve 200 is regulated to the first two-gear; in this way, the stop mechanism can be adjusted to be in a conducting state to stop the action in the feeding process, and the first electronically controlled check valve 200 can play a role of locking, so that the folded plate mould stays at the current position, and the stop mechanism can be adjusted to be in a stop state when the feeding needs to be continued. In addition, a first overflow valve 190 is further provided, the first overflow valve 190 and the first electric control check valve 200 are arranged in parallel, and the overflow direction of the first overflow valve 190 is the flow direction of the oil outlet, so that when bending is performed, if the reaction force is too large, the hydraulic oil at the first oil cylinder 210 can be decompressed through the first overflow valve 190.

In some embodiments of the present application, the first cylinder 210 is a dual stroke cylinder, the first cylinder 210 having a first piston chamber and a second piston chamber, the first piston chamber and the second piston chamber being connected to a first pipe and a second pipe, respectively. The first cylinder 210 acts as two single-acting cylinders arranged in series, the first piston cavity and the second piston cavity are not affected by each other, the first cylinder 210 can be extended by supplying oil to the first piston cavity and/or the second piston cavity, the first cylinder 210 can be shortened by releasing pressure to the first piston cavity and/or the second piston cavity, as disclosed in patent 2015106424. X, a double-stroke hydraulic cylinder can be directly purchased in the market, and the specific structure of the double-stroke hydraulic cylinder is not repeated here. The piston cavity of the second cylinder 220 is called as an advancing piston cavity, the cross-sectional area of the first piston cavity can be set smaller than that of the advancing piston cavity, the cross-sectional area of the second piston cavity is equal to that of the advancing piston cavity, and in one stroke, the folded plate mold can obtain a larger moving speed due to the smaller cross-sectional area of the first piston cavity, and in the second stroke, the first cylinder 210 can also provide thrust for the folded plate mold, so that the stress of the folded plate mold is more uniform.

In some embodiments of the present application, a manual shut-off valve 120 is connected between the tank 110 and the outlet. A seventh pipeline is connected between the oil tank 110 and the oil outlet, and the seventh pipeline is provided with a manual stop valve 120. Through setting up manual stop valve 120, when meetting the trouble and leading to the unable normal return stroke of folded plate mould to original position, can stop oil pump 100 before the maintenance, make manual stop valve 120 switch on, then first hydro-cylinder 210 and second hydro-cylinder 220 all can the pressure release, after the folded plate mould descends to the safe position, carry out the maintenance again and get rid of the trouble.

In some embodiments of the present application, the shut-off structure includes one, two or more two-position four-way reversing valves 130, each of the P and A ports of the two-position four-way reversing valves 130 being in communication with an oil outlet, and each of the T and B ports of the two-position four-way reversing valves 130 being in communication with the oil tank 110. The two-position four-way selector valve 130 has two gears, referred to as a fifth gear in which port P communicates with port a, port T communicates with port B, and a fifth gear in which port P communicates with port B, port T communicates with port a, respectively. The two-position four-way valve is in a fifth gear, namely the stop structure is in a stop state, at the moment, the P port is communicated with the A port, the pressure applied by the hydraulic system to the two-position four-way reversing valve 130 at the P port and the A port is mutually counteracted, namely the hydraulic impact on the two-position four-way reversing valve 130 is smaller, and the failure occurrence rate of the stop structure is reduced; the two-position four-way valve is in a fifth and second gear, namely the stop structure is in a conducting state. When the power is lost, the two-position four-way reversing valve 130 is in a cut-off state, so that the hydraulic system cannot be decompressed, and all components can be started in place quickly next time; meanwhile, in order to avoid the situation that the pressure can not be released during operation due to the failure of the two-position four-way reversing valve 130, the stop structure can be provided with a plurality of two-position four-way reversing valves 130 which are arranged in parallel, and each two-position four-way reversing valve can control the pressure release of the hydraulic system. Of course, in other embodiments of the application, the shut-off structure may be a conventional manual or electric shut-off valve.

In some embodiments of the present application, the number of the second cylinders 220 is plural, and the plurality of second cylinders 220 are disposed in parallel in the second pipeline. The oil receiving ports of the plurality of second cylinders 220 are connected to a second pipeline, and the second pipeline can supply oil to the plurality of second cylinders 220. In this way, the plurality of second cylinders 220 are arranged to facilitate the stress of the folded plate mold to be more uniform when the folded plate mold contacts the steel plate and bends in the second stroke.

In some embodiments of the application, the fourth conduit is provided with a throttle valve 180. The throttle valve 180 is provided in series with the fourth shut-off valve, and the throttle valve 180 may be a manual valve or an electric valve. Thus, the feeding speed of the folded plate mould in the two-stage travel can be controlled by the throttle valve 180 to adapt to the actual requirements of the production site.

While the preferred embodiment of the present application has been illustrated and described, the present application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.

Claims (10)

1. A hydraulic system of a bending machine, which is characterized in that: the oil pump (100) is provided with an oil suction port and an oil outlet, the oil suction port is communicated with the oil pump (100), and a first pipeline is connected between the oil outlet and the first oil cylinder (210); the second oil cylinder (220) is connected with a second pipeline, a third one-way valve (160) is connected between the second pipeline and the oil tank (110), a fourth pipeline is connected between the second pipeline and the oil outlet, and the fourth pipeline is provided with a fourth stop valve; a stop structure is connected between the oil outlet and the oil tank (110).

2. The bender hydraulic system according to claim 1, wherein: an eighth overflow valve (140) is connected between the oil outlet and the oil tank (110).

3. The bender hydraulic system according to claim 2, wherein: a sixth one-way valve (150) is connected between the second pipeline and the oil outlet.

4. The bender hydraulic system according to claim 2, wherein: the fourth stop valve is a one-way stop valve.

5. The bender hydraulic system according to claim 4, wherein: the fourth stop valve is an electric control one-way valve.

6. The bender hydraulic system according to claim 1, wherein: the first pipeline is provided with a first electric control one-way valve (200).

7. The bender hydraulic system according to claim 6, wherein: the first oil cylinder (210) is a double-stroke oil cylinder, the first oil cylinder (210) is provided with a first piston cavity and a second piston cavity, and the first piston cavity and the second piston cavity are respectively connected with the first pipeline and the second pipeline.

8. The bender hydraulic system according to claim 7, wherein: a manual stop valve (120) is connected between the oil tank (110) and the oil outlet.

9. The bender hydraulic system according to claim 1, wherein: the stop structure comprises a two-position four-way reversing valve (130), wherein a P port and an A port of the two-position four-way reversing valve (130) are communicated with the oil outlet, and a T port and a B port of the two-position four-way reversing valve (130) are communicated with the oil tank (110).

10. The bender hydraulic system according to claim 1, wherein: the fourth pipeline is provided with a throttle valve (180).