Quick unloading device for screw-down oil cylinder of rolling mill

Abstract

The utility model relates to the technical field of oil cylinder unloading, in particular to a rolling mill screw-down oil cylinder quick unloading device which comprises a cylinder body, a first oil port and a second oil port are formed in the surface of the cylinder body, a first piston is connected to the surface of the cylinder body in a sliding mode, and a second piston is connected to the surface of the cylinder body in a sliding mode. A piston rod is fixedly connected to the surface of the first piston, and the first piston divides the cylinder body into a rodless cavity and a rod cavity in the cylinder body. The pressure in the rod cavity is detected in real time through the pressure sensor, when the pressure in the rod cavity is too large, the electromagnetic valve opens the backflow channel of the pressure relief pipe, the rod cavity conveys high-pressure oil back to the rodless cavity through the pressure relief pipe, and therefore unloading of the rod cavity is completed, and due to the fact that the corresponding speed of the electromagnetic valve is high, the pressure relief pipe is not damaged. And the response time is shortened, so that the unloading speed is improved, the control precision of a hydraulic system is guaranteed, and the production efficiency is also guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder unloading, in particular to a rolling mill press-down oil cylinder quick unloading device. Background Art

[0002] A rolling mill is a mechanical device used for metal plastic processing. It applies pressure to metal materials through two or more rotating rollers to cause them to undergo plastic deformation. Cylinders play an important role in rolling mills. They are mainly responsible for applying and adjusting rolling force to achieve plastic deformation of metal materials. Cylinders generate force by compressing oil and can adjust the rolling force by controlling the flow of oil.

[0003] The existing oil cylinder unloading adopts two ways of mechanical unloading and hydraulic unloading for unloading. The response speed of hydraulic unloading and mechanical unloading is slow, which affects the control accuracy of the hydraulic system and further affects the production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a rolling mill press cylinder quick unloading device to solve the problem of slow response speed of hydraulic unloading and mechanical unloading proposed in the above background technology, which affects the control accuracy of the hydraulic system and further affects the production efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions, a rolling mill pressing cylinder quick unloading device: comprising a cylinder body, a first oil port is arranged on the surface of the cylinder body, a second oil port is arranged on the surface of the cylinder body, a first piston is slidably connected to the surface of the cylinder body, a piston rod is fixedly connected to the surface of the first piston, the first piston divides the cylinder body into a rodless chamber and a rod chamber inside the cylinder body, a pressure relief pipe is fixedly installed on the surface of the cylinder body, a solenoid valve is fixedly installed on one end of the pressure relief pipe, a one-way valve is fixedly installed on the other end of the pressure relief pipe, a spring is fixedly connected to the surface of the piston rod, a movable rod is fixedly connected to the surface of the spring, a second piston is fixedly connected to the surface of the movable rod, and a pressure sensor is fixedly connected to the surface of the cylinder body.

[0006] Preferably, the pressure relief pipe is in a "U" shape, one end of the pressure relief pipe is connected to the rodless chamber, and the other end of the pressure relief pipe is connected to the rod chamber.

[0007] Preferably, the one-way valve is arranged at one end of the pressure relief pipe close to the rodless chamber, and the solenoid valve is provided with one end of the pressure relief pipe close to the rod chamber.

[0008] Preferably, the high-pressure oil in the rod chamber can be transported back to the rodless chamber through a pressure relief pipe, thereby reducing the pressure load inside the rod chamber.

[0009] Preferably, the one-way valve limits the high-pressure oil in the rodless chamber from entering the pressure relief pipe, the solenoid valve controls the high-pressure oil in the rod chamber from entering the pressure relief pipe, and the operating end of the pressure sensor is arranged on the rod chamber.

[0010] Preferably, a guide groove is provided on the surface of the piston rod, the spring is fixedly connected to the guide groove of the piston rod, and the movable rod slides on the guide groove of the piston rod.

[0011] Preferably, a circular hole is opened at the center of the first piston, and the movable rod and the second piston pass through the circular hole of the first piston.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The pressure sensor detects the pressure inside the rod chamber in real time. When the pressure inside the rod chamber is too high, the solenoid valve opens the reflux channel of the pressure relief pipe, and the rod chamber transfers the high-pressure oil back to the rodless chamber through the pressure relief pipe, thereby completing the unloading of the rod chamber. Due to the fast response speed of the solenoid valve, the response time is shortened, thereby increasing the unloading speed, ensuring the control accuracy of the hydraulic system and also ensuring production efficiency.

[0014] 2. When the pressure inside the rodless chamber is too high, the high-pressure oil inside the rodless chamber will push the movable rod through the second piston, causing the movable rod to slide on the guide groove of the piston rod and causing the spring to deform. When the movable rod slides to one side of the piston rod, the high-pressure liquid on the rodless chamber will flow to the guide groove of the piston rod through the circular hole of the first piston. Since the piston rod stores part of the high-pressure oil pressure in the rodless chamber, the load on the rodless chamber is reduced, reducing the impact of the first piston on the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view stereoscopic schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the structure of the utility model;

[0017] Figure 3 It is a schematic top view of the structure of the utility model;

[0018] Figure 4 It is a schematic cross-sectional front view of the structure of the utility model;

[0019] Figure 5 It is a front view and a sectional stereoscopic schematic diagram of the piston rod structure of the utility model.

[0020] In the figure: 1. cylinder body; 2. first oil port; 3. second oil port; 4. first piston; 5. piston rod; 6. rodless chamber; 7. rod chamber; 8. pressure relief pipe; 9. solenoid valve; 10. one-way valve; 11. spring; 12. movable rod; 13. second piston; 14. pressure sensor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 , an embodiment provided by the utility model:

[0023] A rolling mill pressing cylinder quick unloading device: comprises a cylinder body 1, a first oil port 2 is arranged on the surface of the cylinder body 1, a second oil port 3 is arranged on the surface of the cylinder body 1, the first oil port 2 and the second oil port 3 are both used for introducing high-pressure oil, a first piston 4 is slidably connected to the surface of the cylinder body 1, a piston rod 5 is fixedly connected to the surface of the first piston 4, the first piston 4 divides the cylinder body 1 into a rodless chamber 6 and a rod chamber 7 inside the cylinder body 1, a pressure relief pipe 8 is fixedly installed on the surface of the cylinder body 1, a solenoid valve 9 is fixedly installed on one end of the pressure relief pipe 8, a one-way valve 10 is fixedly installed on the other end of the pressure relief pipe 8, a spring 11 is fixedly connected to the surface of the piston rod 5, a movable rod 12 is fixedly connected to the surface of the spring 11, a second piston 13 is fixedly connected to the surface of the movable rod 12, and a pressure sensor 14 is fixedly connected to the surface of the cylinder body 1.

[0024] Furthermore, the pressure relief pipe 8 is in a "U" shape, one end of the pressure relief pipe 8 is connected to the rodless chamber 6, and the other end of the pressure relief pipe 8 is connected to the rod chamber 7. Since the two ends of the pressure relief pipe 8 are arranged at the two ends of the cylinder body 1, the two ends of the pressure relief pipe 8 are always on the rodless chamber 6 and the rod chamber 7 respectively.

[0025] Furthermore, a one-way valve 10 is arranged at one end of the pressure relief pipe 8 close to the rodless chamber 6 to prevent the high-pressure oil inside the rodless chamber 6 from flowing into the pressure relief pipe 8. A solenoid valve 9 is arranged at one end of the pressure relief pipe 8 close to the rod chamber 7. The solenoid valve 9 is used to open the channel between the rod chamber 7 and the pressure relief pipe 8 so that the high-pressure oil on the rod chamber 7 can flow into the pressure relief pipe 8.

[0026] Furthermore, the high-pressure oil in the rod chamber 7 can be transported back to the rodless chamber 6 through the pressure relief pipe 8, reducing the pressure load inside the rod chamber 7. When the pressure inside the rod chamber 7 reaches a predetermined value, the solenoid valve 9 will automatically open the reflux channel of the high-pressure oil.

[0027] Furthermore, the one-way valve 10 limits the high-pressure oil in the rodless chamber 6 from entering the pressure relief pipe 8, ensuring that the high-pressure oil in the rodless chamber 6 can smoothly push the first piston 4 to slide inside the cylinder body 1. The solenoid valve 9 controls the high-pressure oil in the rod chamber 7 to enter the pressure relief pipe 8. The working end of the pressure sensor 14 is set on the rod chamber 7. When the pressure sensor 14 detects that the pressure inside the rod chamber 7 reaches a predetermined value, the reflux channel of the high-pressure oil in the rod chamber 7 can be opened through the solenoid valve 9.

[0028] Furthermore, a guide groove is opened on the surface of the piston rod 5, the spring 11 is fixedly connected to the guide groove of the piston rod 5, the movable rod 12 slides on the guide groove of the piston rod 5, and the elastic force of the spring 11 acts on the movable rod 12, ensuring that the position of the movable rod 12 in the guide groove of the piston rod 5 is relatively stable.

[0029] Furthermore, a circular hole is opened at the center of the first piston 4, and the movable rod 12 and the second piston 13 pass through the circular hole of the first piston 4. When the pressure inside the rodless chamber 6 is too high, the high-pressure oil will push the movable rod 12 to slide inside the piston rod 5 through the second piston 13, thereby deforming the spring 11. The guide groove of the piston rod 5 can temporarily store the high-pressure oil, thereby reducing the pressure load of the first piston 4 on the inside of the rod chamber 7.

[0030] Working principle: The pressure inside the rod chamber 7 is detected in real time by the pressure sensor 14. When the pressure inside the rod chamber 7 is too high, the solenoid valve 9 opens the reflux channel of the pressure relief pipe 8, and the rod chamber 7 returns the high-pressure oil to the rodless chamber 6 through the pressure relief pipe 8, thereby completing the unloading of the rod chamber 7. Since the response speed of the solenoid valve 9 is fast, the response time is shortened, thereby improving the unloading speed, ensuring the control accuracy of the hydraulic system, and also ensuring production efficiency.

[0031] When the pressure inside the rodless chamber 6 is too high, the high-pressure oil inside the rodless chamber 6 will push the movable rod 12 through the second piston 13, causing the movable rod 12 to slide on the guide groove of the piston rod 5 and causing the spring 11 to deform. When the movable rod 12 slides to one side of the piston rod 5, the high-pressure liquid on the rodless chamber 6 will flow to the guide groove of the piston rod 5 through the circular hole of the first piston 4. Since the piston rod 5 stores a part of the high-pressure oil pressure of the rodless chamber 6, the load on the rodless chamber 6 is reduced, thereby reducing the impact of the first piston 4 on the cylinder body 1.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A rolling mill pressing cylinder quick unloading device, characterized in that: The invention comprises a cylinder body (1), a first oil port (2) is arranged on the surface of the cylinder body (1), a second oil port (3) is arranged on the surface of the cylinder body (1), a first piston (4) is slidably connected to the surface of the cylinder body (1), a piston rod (5) is fixedly connected to the surface of the first piston (4), the first piston (4) divides the cylinder body (1) into a rodless chamber (6) and a rod chamber (7) inside the cylinder body (1), a pressure relief pipe (8) is fixedly installed on the surface of the cylinder body (1), a solenoid valve (9) is fixedly installed on one end of the pressure relief pipe (8), a one-way valve (10) is fixedly installed on the other end of the pressure relief pipe (8), a spring (11) is fixedly connected to the surface of the piston rod (5), a movable rod (12) is fixedly connected to the surface of the spring (11), a second piston (13) is fixedly connected to the surface of the movable rod (12), and a pressure sensor (14) is fixedly connected to the surface of the cylinder body (1).

2. A rolling mill press cylinder quick unloading device according to claim 1, characterized in that: The pressure relief pipe (8) is in a "U" shape, one end of the pressure relief pipe (8) is connected to the rodless chamber (6), and the other end of the pressure relief pipe (8) is connected to the rod chamber (7).

3. A rolling mill press cylinder quick unloading device according to claim 1, characterized in that: The one-way valve (10) is arranged at one end of the pressure relief pipe (8) close to the rodless chamber (6), and the solenoid valve (9) is arranged at one end of the pressure relief pipe (8) close to the rod chamber (7).

4. A rolling mill press cylinder quick unloading device according to claim 3, characterized in that: The high-pressure oil in the rod chamber (7) can be transported back to the rodless chamber (6) through the pressure relief pipe (8), thereby reducing the pressure load inside the rod chamber (7).

5. A rolling mill press cylinder quick unloading device according to claim 4, characterized in that: The one-way valve (10) limits the high-pressure oil in the rodless chamber (6) from entering the pressure relief pipe (8), the solenoid valve (9) controls the high-pressure oil in the rod chamber (7) to enter the pressure relief pipe (8), and the operating end of the pressure sensor (14) is arranged on the rod chamber (7).

6. A rolling mill press cylinder quick unloading device according to claim 1, characterized in that: A guide groove is provided on the surface of the piston rod (5), the spring (11) is fixedly connected to the guide groove of the piston rod (5), and the movable rod (12) slides on the guide groove of the piston rod (5).

7. A rolling mill press cylinder quick unloading device according to claim 6, characterized in that: A circular hole is formed at the center of the first piston (4), and the movable rod (12) and the second piston (13) pass through the circular hole of the first piston (4).

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