Double-loop hydraulic system for preventing coiled materials from being damaged by jacking of coil conveying trolley

Abstract

The utility model relates to a double-loop hydraulic system for preventing coiled materials from being damaged by jacking of a coil conveying trolley, which comprises a high-pressure loop connected with a jacking oil cylinder of the coil conveying trolley and a low-pressure loop, and the low-pressure loop and the high-pressure loop are switched through a reversing valve. The low-pressure loop comprises a low-pressure control oil way, a low-pressure reducing valve and a first hydraulic control one-way valve, the low-pressure reducing valve and the first hydraulic control one-way valve are connected in series, the low-pressure control oil way is connected with the oil inlet end of the first hydraulic control one-way valve, and the oil outlet end of the first hydraulic control one-way valve is connected with the oil inlet end of the jacking oil cylinder. A low-pressure loop is additionally arranged on the basis of an original high-pressure loop for controlling a jacking oil cylinder of a coil conveying trolley to work, the jacking oil cylinder is firstly driven by the low-pressure loop to work, small-pressure contact with a coiled material is achieved, then the high-pressure loop is switched to control the jacking oil cylinder to jack the coiled material at high pressure, it is guaranteed that oil pressure can bear the weight of the coiled material, and the coiled material is safely jacked and conveyed away; in the whole process, the bottom of the coiled material is effectively prevented from being excessively pressed to generate marks which affect the product quality.

Description

Technical field:

[0002] The utility model relates to a double-circuit hydraulic system for preventing a coil transport trolley from damaging coils. Background technology:

[0004] After the domestic cold rolling mill finishes rolling aluminum coils, the coil transport trolley at the exit of the cold rolling mill is in the process of unloading and lifting the coils. When the tray of the coil transport trolley contacts the aluminum coil, since a single high-pressure hydraulic oil circuit is used to control the lifting cylinder on the coil transport trolley, in order to lift the coil, the lifting cylinder on the coil transport trolley is usually set to a lifting pressure that exceeds the weight of the coil to contact the bottom of the aluminum coil, which easily causes excessive pressure on the bottom of the coil, resulting in marks and affecting product quality. Therefore, it is necessary to improve this technical problem, and this case was born. Utility model content:

[0006] The utility model makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the utility model is to provide a dual-circuit hydraulic system for preventing the coil from being damaged by the coil transport trolley, which has a reasonable design and can effectively avoid excessive pressure on the bottom of the coil caused by the coil unloading and lifting process.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, comprising a high-pressure circuit connected to a lifting cylinder of the coil transport trolley, and a low-pressure circuit. The low-pressure circuit and the high-pressure circuit are switched by a reversing valve. The low-pressure circuit comprises a low-pressure control oil circuit and a low-pressure reducing valve and a first hydraulically controlled one-way valve connected in series. The low-pressure control oil circuit is connected to the oil inlet end of the first hydraulically controlled one-way valve, and the oil outlet end of the first hydraulically controlled one-way valve is connected to the oil inlet end of the lifting cylinder.

[0008] Furthermore, the high-pressure circuit includes a high-pressure control oil circuit, a second hydraulically controlled one-way valve and a high-pressure reducing valve. The high-pressure control oil circuit and the low-pressure control oil circuit are switched by a reversing valve. The high-pressure control oil circuit is connected to the oil inlet end of the second hydraulically controlled one-way valve, and the oil outlet end of the second hydraulically controlled one-way valve is connected to the oil inlet end of the lifting cylinder. The high-pressure reducing valve is connected between the oil inlet end and the oil outlet end of the lifting cylinder.

[0009] Furthermore, the oil supply pressure of the low-pressure circuit is less than 30 Bar.

[0010] Furthermore, the maximum oil supply pressure of the high-pressure circuit is 160 Bar.

[0011] Furthermore, the coil transport trolley is provided with a detection unit for detecting whether the pallet of the coil transport trolley contacts the coil, and the detection unit is electrically connected to the reversing valve, the first hydraulically controlled one-way valve, the second hydraulically controlled one-way valve, the low-pressure reducing valve and the high-pressure reducing valve through the control unit.

[0012] Compared with the prior art, the utility model has the following effects: the utility model has a simple and reasonable structural design, and a low-pressure circuit is added on the basis of the original high-pressure circuit for controlling the lifting cylinder of the coil transport trolley. The lifting cylinder is first driven by the low-pressure circuit to achieve low-pressure contact with the coil, and then the high-pressure circuit is switched back to control the lifting cylinder to lift the coil with high pressure, ensuring that the oil pressure can bear the weight of the coil and safely lift the coil and transport it away. The whole process effectively avoids excessive pressure on the bottom of the coil, which causes marks and affects product quality. Description of the drawings:

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the coil transport trolley in the embodiment of the utility model.

[0016] In the figure:

[0017] 1-high-pressure oil circuit; 2-coil transport trolley; 3-lifting cylinder; 4-pallet; 5-coil; 6-low-pressure circuit; 7-low-pressure control oil circuit; 8-low-pressure reducing valve; 9-first hydraulically controlled one-way valve; 10-high-pressure control oil circuit; 11-second hydraulically controlled one-way valve; 12-high-pressure reducing valve. Specific implementation method:

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figures 1-2As shown, the utility model is a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, comprising an original high-pressure circuit 1 connected to a lifting cylinder 3 of a coil transport trolley 2, the improvement of the hydraulic system being that it also comprises a low-pressure circuit 6, the low-pressure circuit 6 and the high-pressure circuit 1 are switched via a reversing valve (not shown in the figure), and the high- and low-pressure circuits are switched to work via the reversing valve; the low-pressure circuit 6 comprises a low-pressure control oil circuit 7, a low-pressure reducing valve 8 connected in series and a first hydraulically controlled one-way valve 9, the low-pressure control oil circuit 7 is connected to the oil inlet end of the first hydraulically controlled one-way valve 9, and the oil outlet end of the first hydraulically controlled one-way valve 9 is connected to the oil inlet end of the lifting cylinder 3. By adding a low-pressure circuit on the basis of the original high-pressure circuit, during the process of unloading and lifting the coil, the coil transport trolley first drives the lifting cylinder through the low-pressure circuit to achieve small pressure contact with the coil, and then switches back to the high-pressure circuit to control the lifting cylinder to lift the coil with high pressure, ensuring that the oil pressure can bear the weight of the coil and safely lift the coil and transport it away. The whole process effectively avoids excessive pressure on the bottom of the coil, which will cause marks and affect product quality.

[0022] In this embodiment, the high-pressure circuit 1 includes a high-pressure control oil circuit 10, a second hydraulically controlled one-way valve 11 and a high-pressure reducing valve 12. The high-pressure control oil circuit 10 and the low-pressure control oil circuit 7 are switched by a reversing valve. The high-pressure control oil circuit and the low-pressure control oil circuit are supplied with oil by an oil pump. The high-pressure control oil circuit 10 is connected to the oil inlet end of the second hydraulically controlled one-way valve 11, and the oil outlet end of the second hydraulically controlled one-way valve 11 is connected to the oil inlet end of the lifting cylinder 3. The high-pressure reducing valve 12 is connected between the oil inlet end and the oil outlet end of the lifting cylinder 3.

[0023] It should be noted that in this hydraulic system, the remaining pipeline connections of the first hydraulically controlled one-way valve, the second hydraulically controlled one-way valve, the low-pressure reducing valve and the high-pressure reducing valve are existing technologies, such as the oil unloading port of the hydraulically controlled one-way valve being connected to the oil return tank, etc., and no further repetition will be made here.

[0024] In this embodiment, the oil supply pressure of the low-pressure circuit is less than 30 Bar.

[0025] In this embodiment, the maximum oil supply pressure of the high-pressure circuit is 160 Bar.

[0026] Specific implementation process: During the unloading and lifting process of the coil transport trolley, the reversing valve switches to control the oil inlet of the low-pressure control oil circuit 7, opens the first hydraulic control one-way valve 9, and the oil circuit of the lifting cylinder 3 of the coil transport trolley 2 is supplied with oil from the newly added low-pressure circuit 6, with a pressure less than 30Bar. The lifting cylinder 3 contacts the coil with a small pressure to avoid damage caused by high pressure touching the coil. After the tray 4 of the coil transport trolley 1 completely contacts the coil 5, the reversing valve is controlled to switch the valve body direction, the low-pressure control oil circuit 7 is cut off, and the oil circuit of the lifting cylinder 3 goes to the original high-pressure oil circuit 1, with a maximum oil pressure of 160Bar, to ensure that the oil pressure can bear the weight of the coil and safely lift and transport the coil.

[0027] In another embodiment, for the convenience of control, a detection unit for detecting whether the pallet of the coil transport trolley contacts the coil is provided on the coil transport trolley, and the detection unit is electrically connected to the reversing valve, the first hydraulically controlled one-way valve, the second hydraulically controlled one-way valve, the low-pressure reducing valve and the high-pressure reducing valve through the control unit.

[0028] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0029] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0030] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, comprising a high-pressure circuit connected to a lifting cylinder of the coil transport trolley, characterized in that: It also includes a low-pressure circuit, which is switched with the high-pressure circuit through a reversing valve. The low-pressure circuit includes a low-pressure control oil circuit and a low-pressure reducing valve and a first hydraulically controlled one-way valve connected in series. The low-pressure control oil circuit is connected to the oil inlet end of the first hydraulically controlled one-way valve, and the oil outlet end of the first hydraulically controlled one-way valve is connected to the oil inlet end of the lifting cylinder.

2. According to claim 1, a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, characterized in that: The high-pressure circuit includes a high-pressure control oil circuit, a second hydraulically controlled one-way valve and a high-pressure reducing valve. The high-pressure control oil circuit and the low-pressure control oil circuit are switched by a reversing valve. The high-pressure control oil circuit is connected to the oil inlet end of the second hydraulically controlled one-way valve, and the oil outlet end of the second hydraulically controlled one-way valve is connected to the oil inlet end of the jacking cylinder. The high-pressure reducing valve is connected between the oil inlet end and the oil outlet end of the jacking cylinder.

3. According to claim 2, a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, characterized in that: The oil supply pressure of the low-pressure circuit is less than 30 Bar.

4. According to claim 3, a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, characterized in that: The maximum oil supply pressure of the high-pressure circuit is 160 Bar.

5. According to claim 4, a dual-circuit hydraulic system for preventing a coil transport trolley from damaging a coil, characterized in that: The coil transport trolley is provided with a detection unit for detecting whether the pallet of the coil transport trolley contacts the coil; the detection unit is electrically connected to the reversing valve, the first hydraulically controlled one-way valve, the second hydraulically controlled one-way valve, the low-pressure reducing valve and the high-pressure reducing valve through the control unit.

Images