Quick lifting system for feeding roller

Abstract

The invention discloses a feeding roller quick lifting system which comprises an oil conveying pipeline, an oil return pipeline, a left hydraulic cylinder and a right hydraulic cylinder, rod cavities of the hydraulic cylinders are connected with the oil conveying pipeline and the oil return pipeline through rod cavity pipelines, and rodless cavities of the hydraulic cylinders are connected with the oil conveying pipeline and the oil return pipeline through rodless cavity pipelines. A rod cavity energy accumulator and a rod cavity reversing valve are arranged on the rod cavity pipeline, and a rodless cavity energy accumulator, a rodless cavity reversing valve and an electromagnetic ball valve are arranged on the rodless cavity pipeline. The electromagnetic ball valve can lock pressure oil in the rodless cavity, the pressure building time of the rodless cavity is shortened, and the rodless cavity energy accumulator can compensate for changes of the volume and pressure of hydraulic oil in the rodless cavity. The rod cavity energy accumulator can compensate changes of volume and pressure of hydraulic oil of the rod cavity, oil can be rapidly fed and discharged from the rod cavity, and rapid lifting of the heavy servo feeding roller can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of strip conveying, in particular to a feeding roller rapid lifting system. Background Art

[0002] The servo feeder is an automatic feeding device driven by a servo motor. Its working principle is to drive two feed rollers through the servo motor so that the plate can be fed accurately according to the specified requirements.

[0003] During the stamping process of the strip, because there are guide pins in the mold, it is necessary to lift the feed roller when the press is closed to automatically align the strip.

[0004] There are two existing technologies. One uses a pneumatic cylinder to quickly lift the feed roller. This solution has the advantages of low cost, simple control, and high lifting force. However, it is limited by the switching speed of the pneumatic valve and the movement speed of the piston in the cylinder, and the maximum cycle time is generally within 30spm. The other uses a servo motor to drive a cam to achieve rapid lifting. The advantage is a high cycle time, which can reach a maximum of over 90spm. However, the control program is complex, the lifting force is small, and the cost is high. There is an urgent need for a cost-effective device that can quickly lift heavy servo feed rollers. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a feed roller quick lifting system which is low in cost and can realize the quick lifting of heavy servo feed rollers.

[0006] The technical solution adopted by the present invention to solve the technical problem is: A feed roller quick lifting system includes an oil pipeline, an oil return pipeline and left and right hydraulic cylinders, the rod chamber of the hydraulic cylinder is connected to the oil pipeline and the oil return pipeline through the rod chamber pipeline, and the rodless chamber of the hydraulic cylinder is connected to the oil pipeline and the oil return pipeline through the rodless chamber pipeline, the rod chamber pipeline is provided with a rod chamber accumulator and a rod chamber reversing valve, and the rodless chamber pipeline is provided with a rodless chamber accumulator, a rodless chamber reversing valve and an electromagnetic ball valve.

[0007] Furthermore, a manual pressure reducing valve is provided on the rod cavity pipeline.

[0008] Furthermore, a proportional pressure reducing valve is provided on the rodless cavity pipeline.

[0009] Furthermore, a one-way throttle valve is provided on the rodless cavity pipeline.

[0010] Furthermore, a pressure detection sensor is provided on the rodless cavity pipeline.

[0011] Furthermore, one end of the rod chamber reversing valve is communicated with the rod chamber of the hydraulic cylinder, and the other end of the rod chamber reversing valve is connected to the oil delivery pipeline and the oil return pipeline respectively.

[0012] Furthermore, one end of the rodless cavity reversing valve is communicated with the rodless cavity of the hydraulic cylinder, and the other end of the rodless cavity reversing valve is connected to the oil delivery pipeline and the oil return pipeline respectively.

[0013] The beneficial effects of the present invention are: 1. In the present invention, the rod chamber of the hydraulic cylinder is connected to the oil supply pipeline and the oil return pipeline through a rod chamber pipeline, and the rodless chamber of the hydraulic cylinder is connected to the oil supply pipeline and the oil return pipeline through a rodless chamber pipeline. The rod chamber pipeline is provided with a rod chamber accumulator and a rod chamber reversing valve. The rodless chamber pipeline is provided with a rodless chamber accumulator, a rodless chamber reversing valve and an electromagnetic ball valve. The rodless chambers of the two oil cylinders are connected in sequence with a rodless chamber accumulator, an electromagnetic ball valve and a rodless chamber reversing valve. The electromagnetic ball valve can lock the pressure oil in the rodless chamber, reducing the pressure building time of the rodless chamber. The rodless chamber accumulator can compensate for the changes in the volume and pressure of the hydraulic oil in the rodless chamber. The rod chamber accumulator can compensate for the changes in the volume and pressure of the hydraulic oil in the rod chamber. The rod chamber can quickly take in and discharge oil, and can achieve the rapid lifting of the heavy servo feed roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 It is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the present invention in a downward pressing state; Figure 3 It is a schematic diagram of the present invention in a lifted state.

[0016] In the figure: oil delivery pipeline 1, oil return pipeline 2, hydraulic cylinder 3, rod chamber pipeline 4, rodless chamber pipeline 5, rod chamber accumulator 6, rod chamber reversing valve 7, rodless chamber accumulator 8, rodless chamber reversing valve 9, solenoid ball valve 10, manual pressure reducing valve 11, proportional pressure reducing valve 12, one-way throttle valve 13, pressure detection sensor 14. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a feed roller quick lifting system includes an oil pipeline 1, an oil return pipeline 2 and left and right hydraulic cylinders 3. The rod chamber of the hydraulic cylinder 3 is connected to the oil pipeline 1 and the oil return pipeline 2 through a rod chamber pipeline 4, and the rodless chamber of the hydraulic cylinder 3 is connected to the oil pipeline 1 and the oil return pipeline 2 through a rodless chamber pipeline 5. The rod chamber pipeline 4 is provided with a rod chamber accumulator 6 and a rod chamber reversing valve 7, and the rodless chamber pipeline 5 is provided with a rodless chamber accumulator 8, a rodless chamber reversing valve 9 and an electromagnetic ball valve 10.

[0019] The function of the accumulator is to compensate for changes in hydraulic oil pressure and volume.

[0020] The rod chamber reversing valve is a three-position four-way solenoid reversing valve, which is used to switch the flow direction of the pressure oil and can block the hydraulic oil for a short time when it is in the middle position.

[0021] The rodless cavity reversing valve is a two-position four-way electromagnetic reversing valve, which is used to switch the flow direction of the pressure oil.

[0022] The function of the electromagnetic ball valve is to cut off the hydraulic pipeline and ensure that the pressure oil is maintained.

[0023] The feeding roller quick lifting device adopts a hydraulic device, which controls the feeding roller to perform vertical up and down reciprocating motion through the cylinder connection mechanism; the feeding roller performs a fixed-axis rotation motion with the roller center as the axis, and the connection structure of the cylinder can be a direct connection or a rod system. The feeding roller realizes the work of transporting the plate through the above-mentioned composite motion.

[0024] The servo feed roller has two operating modes: operating and maintenance. In the operating mode, the pressing force is programmable to accommodate materials of varying thickness, width, and surface quality. The rapid lifting action is completed during the press closing process, accounting for approximately one-tenth of a stamping cycle. In the maintenance mode, the feed roller must be fully raised and maintained.

[0025] A hydraulic cylinder is connected to each end of the servo feed roller. The rod chamber of the hydraulic cylinder is connected in sequence to a rod chamber reversing valve 7 and a rod chamber accumulator 6. The rod chamber reversing valve 7 controls the lifting timing, and the rod chamber accumulator 6 compensates for flow loss during movement. The rodless chambers of the two hydraulic cylinders are connected in sequence to a rodless chamber accumulator 8, an electromagnetic ball valve 10, and a rodless chamber reversing valve 9. The electromagnetic ball valve 10 locks the pressure oil in the rodless chamber, and the rodless chamber accumulator 8 compensates for changes in the volume and pressure of the hydraulic oil in the rodless chamber, reducing the pressure buildup time in the rodless chamber. During maintenance, the reversing valve drains the hydraulic oil from the rodless chamber. The system can programmatically adjust the pressing force, lock the pressure oil in the rodless chamber, and rapidly pump and discharge oil from the rod chamber, enabling rapid lifting of heavy-duty servo feed rollers, with a maximum lifting cycle of 90spm. This solves the problems of slow lifting cycles of existing cylinders and high costs and low power of servo motors.

[0026] The rod cavity pipeline 4 is provided with a manual pressure reducing valve 11, which is used to manually adjust the output pressure and the pressure during lifting.

[0027] The rodless cavity pipeline 5 is provided with a proportional pressure reducing valve 12. The function of the proportional pressure reducing valve 12 is to adjust the output pressure by program control. It is more convenient to use than a manual pressure reducing valve and can adapt to the transportation requirements of different sheet materials.

[0028] The rodless cavity pipeline 5 is provided with a one-way throttle valve 13, and the function of the one-way throttle valve 13 is to adjust the flow of the hydraulic pipeline and control the speed of the actuator.

[0029] The rodless cavity pipe 5 is provided with a pressure detection sensor 14 , which is used to detect the pressure in the hydraulic pipeline and send a signal to the control system.

[0030] One end of the rod chamber reversing valve 7 is communicated with the rod chamber of the hydraulic cylinder 3 , and the other end of the rod chamber reversing valve 7 is connected to the oil delivery pipeline 1 and the oil return pipeline 2 respectively.

[0031] One end of the rodless cavity reversing valve 9 is communicated with the rodless cavity of the hydraulic cylinder 3 , and the other end of the rodless cavity reversing valve 9 is connected to the oil delivery pipeline 1 and the oil return pipeline 2 respectively.

[0032] like Figure 2 and Figure 3As shown, in the quick-lift state, the manual pressure-reducing valve 11 manually adjusts the pressure, and the rod-chamber accumulator 6 connected to the manual pressure-reducing valve 11 is filled with pressurized oil. When the press enters the quick-lift state, the control program sends a reversing signal to the rod-chamber reversing valve 7. After the reversing is completed, the rod-chamber reversing valve 7 fills the rod-chamber of the oil cylinder with oil. With the assistance of the rod-chamber accumulator 6, rapid oil filling can be achieved. The hydraulic oil in the rodless chamber is compressed by the rod chamber and intercepted by the electromagnetic ball valve 10, preventing it from being discharged. As a result, the bladder of the rodless chamber accumulator 8 expands to accommodate the hydraulic oil compressed from the rod chamber, achieving rapid lifting of the feed roller.

[0033] In the downward pressing state, when the press runs to the set starting falling angle, the control program sends a reversing signal to the rod chamber reversing valve 7. After the rod chamber reversing valve 7 completes the reversing, the rod chamber of the cylinder is discharged, the bladder of the rodless chamber accumulator 8 contracts, and the rodless chamber of the cylinder is filled with oil, completing the rapid drop of the feed roller.

[0034] Maintenance status: The rod chamber reversing valve 7 is reversed, and the rod chamber of the oil cylinder is filled with oil. The rodless chamber reversing valve 9 is reversed, and the rodless chamber of the oil cylinder is drained, so that the feed roller can be lifted slowly with a large stroke.

[0035] In the description of the present invention, it should be noted that the terms "left", "right", "up", "down", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A feeding roller quick lifting system, comprising an oil delivery pipeline (1), an oil return pipeline (2) and two left and right hydraulic cylinders (3), characterized in that: The rod chamber of the hydraulic cylinder (3) is connected to the oil delivery pipeline (1) and the oil return pipeline (2) via a rod chamber pipeline (4); the rodless chamber of the hydraulic cylinder (3) is connected to the oil delivery pipeline (1) and the oil return pipeline (2) via a rodless chamber pipeline (5); a rod chamber accumulator (6) and a rod chamber reversing valve (7) are provided on the rod chamber pipeline (4); and a rodless chamber accumulator (8), a rodless chamber reversing valve (9) and an electromagnetic ball valve (10) are provided on the rodless chamber pipeline (5).

2. A feed roller quick lifting system as claimed in claim 1, characterized in that: A manual pressure reducing valve (11) is provided on the rod cavity pipeline (4).

3. A feed roller quick lifting system as claimed in claim 1, characterized in that: The rodless cavity pipeline (5) is provided with a proportional pressure reducing valve (12).

4. A feed roller quick lifting system as claimed in claim 1, characterized in that: A one-way throttle valve (13) is provided on the rodless cavity pipeline (5).

5. The feed roller quick lifting system according to claim 1, characterized in that: A pressure detection sensor (14) is provided on the rodless cavity pipeline (5).

6. A feed roller quick lifting system as claimed in claim 1, characterized in that: One end of the rod chamber reversing valve (7) is communicated with the rod chamber of the hydraulic cylinder (3), and the other end of the rod chamber reversing valve (7) is respectively connected to the oil delivery pipeline (1) and the oil return pipeline (2).

7. The feed roller quick lifting system according to claim 1, characterized in that: One end of the rodless cavity reversing valve (9) is communicated with the rodless cavity of the hydraulic cylinder (3), and the other end of the rodless cavity reversing valve (9) is respectively connected to the oil delivery pipeline (1) and the oil return pipeline (2).

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