Screw-down oil cylinder and hot rolling unit

Abstract

The invention relates to the technical field of machining equipment, and provides a screw-down oil cylinder and a hot rolling unit. The screw-down oil cylinder comprises a cylinder body used for being connected to the bottom of a rolling mill housing, and the opening end of the cylinder body deviates from the bottom of the rolling mill housing; the piston is movably connected to the open end of the cylinder body, a hole cavity is formed in the end, away from the cylinder body, of the piston, the pressure measuring instrument is arranged in the hole cavity, and the pressure bearing pad is connected to the end, away from the cylinder body, of the piston and used for sealing the hole cavity. The guide rod penetrates through the rolling mill housing and the cylinder body and is connected with the piston; the fixed part of the displacement sensor is arranged on the top of a rolling mill housing, and the movable part of the displacement sensor is connected to one end of the guide rod away from the piston. The pressure measuring instrument is arranged in the hole cavity through the pressure bearing pad so that the pressure measuring instrument can be arranged in the screw-down oil cylinder, damage to the pressure measuring instrument caused by the severe environment is avoided, the displacement sensor is arranged outside the rolling mill housing, the maintenance and replacement convenience is improved, and then the use convenience of the pressure measuring instrument and the displacement sensor is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing equipment, in particular to a pressing oil cylinder and a hot rolling mill unit. Background Art

[0002] In the metal processing and rolling industry, the press cylinder is an important hydraulic equipment for achieving precise pressing and forming. Its main function is to push the piston movement through the pressure of the hydraulic oil, thereby controlling the pressing force and displacement during the rolling process. In order to ensure the normal operation of the press cylinder, detection devices such as pressure gauges and displacement sensors are usually used to monitor the press cylinder. The pressure gauge is responsible for real-time monitoring of the pressure changes in the cylinder to ensure the stability and safety of the hydraulic system. The displacement sensor is used to measure the displacement of the piston and provide the necessary feedback signal for precise control and adjustment, thereby ensuring product quality and production efficiency.

[0003] In the prior art, the pressure gauge is usually separated from the pressure cylinder. However, due to factors such as window size limitations and roller system structure limitations, some rolling mills cannot reasonably place the pressure gauge. In addition, the working environment outside the pressure cylinder is harsh and needs to withstand high temperature, high pressure and vibration, which greatly shortens the service life of the pressure gauge. The displacement sensor is usually installed inside the cylinder. This setting not only limits the accessibility of the sensor, but also increases the difficulty of replacement and maintenance. Summary of the invention

[0004] The problem solved by the invention is how to improve the service life of a depression cylinder pressure gauge and the convenience of using a displacement sensor.

[0005] In order to solve the above problems, the present invention provides a pressing cylinder and a hot rolling mill unit.

[0006] In a first aspect, the present invention provides a depression oil cylinder, comprising: a cylinder body, a piston, a pressure gauge, a displacement sensor, a pressure pad and a guide rod;

[0007] The cylinder body is used to be connected to the bottom of the rolling mill arch, and the open end of the cylinder body is away from the bottom of the rolling mill arch;

[0008] The piston is movably connected to the open end of the cylinder body, a cavity is formed at one end of the piston away from the cylinder body, the pressure gauge is arranged in the cavity, the pressure pad is connected to the end of the piston away from the cylinder body, and the pressure pad is used to close the cavity;

[0009] The guide rod is used to penetrate the rolling mill arch and the cylinder body and is connected to the piston;

[0010] The fixed part of the displacement sensor is used to be arranged on the top of the rolling mill arch, and the movable part of the displacement sensor is connected to an end of the guide rod away from the piston.

[0011] Optionally, the depression cylinder also includes a portal frame, the portal frame includes a side plate and a middle plate, the two side plates are used to be spaced apart and arranged on the top of the rolling mill arch, the middle plate is arranged between the two side plates, and the fixing part of the displacement sensor is arranged on the middle plate.

[0012] Optionally, the guide rod includes a first guide rod and a second guide rod, one end of the first guide rod is connected to the piston, the other end of the first guide rod is used to extend into the rolling mill arch, the second guide rod is arranged in the rolling mill arch, and the end of the first guide rod extending into the rolling mill arch is detachably connected to the second guide rod.

[0013] Optionally, the depression cylinder further includes a bushing, wherein the bushing is disposed between the rolling mill arch and the cylinder body, and the first guide rod is passed through the bushing.

[0014] Optionally, the first guide rod and the second guide rod are connected by threads, and the depression cylinder also includes a stop assembly, which is connected between the first guide rod and the second guide rod, and the stop assembly is used to prevent the threads of the first guide rod and the second guide rod from loosening.

[0015] Optionally, the depression cylinder further includes a lower pad, and the lower pad is arranged between the pressure pad and the pressure gauge.

[0016] Optionally, the depression cylinder further includes an upper pad, and the upper pad is arranged between the pressure gauge and the piston.

[0017] Optionally, a wire outlet hole is formed on the side wall of the piston, and the wire outlet hole is communicated with the cavity.

[0018] Optionally, the pressing cylinder further comprises a cylinder cover, which is detachably connected to the end surface of the cylinder body away from the rolling mill arch, and an oil circuit is opened on the cylinder cover, which is connected to the inside of the cylinder body.

[0019] In a second aspect, the present invention provides a hot rolling mill group, including a rolling mill housing and the depression cylinder as described above.

[0020] The beneficial effects of the depression cylinder, i.e., the hot rolling mill unit, of the present invention are as follows: the cylinder body is arranged at the bottom of the rolling mill arch, and the rolling mill arch can provide a certain support force and fixing effect for the cylinder body. The open end of the cylinder body is away from the bottom of the rolling mill arch, and the piston is arranged at the open end of the cylinder body. A cavity for placing a pressure gauge is provided at one end of the piston away from the cylinder body, and the cavity after the pressure gauge is installed can be closed by a pressure pad to prevent the pressure gauge from falling during the operation of the depression cylinder. The pressure gauge is arranged in the depression cylinder through the cavity and the pressure pad, which avoids damage to the pressure gauge caused by the complex working environment outside the depression cylinder and the problem of being unable to install, thereby improving the service life and convenience of the pressure gauge, and increasing the applicability of the depression cylinder. Pressure gauges of different sizes can be placed in the cavity. At the same time, one end of the guide rod is connected to the piston, and the other end is provided with a movable end of the displacement sensor, and the guide rod passes through the rolling mill arch and the cylinder body, so that the end of the guide rod away from the piston extends out of the depression cylinder. For example, the end of the guide rod away from the piston is arranged on the rolling mill arch or is flush with the end surface of the rolling mill arch away from the cylinder body, so that the movable end of the displacement sensor is connected to the outside of the depression cylinder, and the fixed end of the displacement sensor is arranged on the top of the rolling mill arch. Even if the displacement sensors are arranged on the outside of the depression cylinder, it is helpful to repair and replace the displacement sensors, increase the convenience of using the displacement sensors, and avoid the influence of the internal environment of the cylinder (such as heavy water vapor) on the displacement sensors, thereby improving the service life of the displacement sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a pressing cylinder according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1-cylinder body; 2-piston; 21-bore cavity; 3-pressure gauge; 4-displacement sensor; 5-pressure pad; 6-guide rod; 61-first guide rod; 62-second guide rod; 7-rolling mill arch; 8-gantry; 81-side plate; 82-middle plate; 9-bushing; 10-stop assembly; 11-lower pad; 12-upper pad; 13-wire outlet hole; 14-cylinder head. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0025] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0026] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0027] like Figure 1 As shown, a pressing cylinder according to an embodiment of the present invention includes a cylinder body 1, a piston 2, a pressure gauge 3, a displacement sensor 4, a pressure pad 5 and a guide rod 6.

[0028] The cylinder body 1 is used to be connected to the bottom of the rolling mill arch 7, and the open end of the cylinder body 1 is away from the bottom of the rolling mill arch 7. The outer shape of the cylinder body 1 can be cylindrical or polygonal or other irregular shapes.

[0029] The piston 2 is movably connected to the open end of the cylinder body 1, and a cavity 21 is formed at the end of the piston 2 away from the cylinder body 1. The pressure gauge 3 is arranged in the cavity 21. The pressure pad 5 is connected to the end of the piston 2 away from the cylinder body 1, and the pressure pad 5 is used to close the cavity 21.

[0030] Specifically, in order to ensure that the pressure gauge 3 does not shake in the bore 21 as the piston 2 moves, the width and length of the bore 21 are usually matched with the width and length of the pressure gauge 3, so that the pressure pad 5 can be detachably connected to the end of the piston away from the cylinder body 1 by, for example, a number of bolts. After the bore 21 is closed, the pressure gauge 3 is clamped in the bore 21 to prevent the pressure gauge 3 from falling, or the pressure gauge 3 is detachably connected (for example, bolted or pasted) to the inner wall of the bore 21 to fix the pressure gauge 3. It should be noted that due to the large number of types and sizes of pressure gauges 3, in order to ensure the applicability of the depression cylinder, the bore 21 is usually opened larger. When the pressure gauge 3 is installed, the pressure gauge 3 can be detachably connected to the inner wall of the bore 3, or the empty part in the bore 21 after the pressure gauge 3 is installed can be filled with a pad, a pad or other structure.

[0031] The guide rod 6 is used to penetrate the rolling mill arch 7 and the cylinder body 1 and is connected to the piston 2 .

[0032] The fixed portion of the displacement sensor 4 is used to be arranged on the top of the rolling mill arch 7 , and the movable portion of the displacement sensor 4 is connected to an end of the guide rod 6 away from the piston 2 .

[0033] Specifically, the displacement sensor 4 can be a split displacement sensor, and the fixed part of the displacement sensor 4, that is, the sensing body, is set on the rolling mill arch 7 to ensure the stability of the fixed part of the displacement sensor 4. The movable part of the displacement sensor 4, that is, the measuring part, is set at the end of the guide rod away from the piston 2. The displacement measurement is realized by the relative movement of the fixed part of the displacement sensor 4 and the movable part of the displacement sensor 4, that is, the guide rod moves with the piston 2 to drive the movable part of the displacement sensor 4 to move. The fixed part of the displacement sensor 4 fixedly set on the rolling mill arch 7 detects the movement displacement of the movable part of the displacement sensor 4, and then obtains the movement displacement of the pressing cylinder piston 2.

[0034] It should be noted that the displacement sensor 4 in this embodiment is an electromagnetic displacement sensor, wherein the fixed part of the displacement sensor 4 is a sensing rod or a magnetic head, and the movable part of the displacement sensor 4 is a magnet ring or a magnetic scale, and an LVDT (Linear Variable Differential Transformer) displacement sensor, etc., may also be used. Alternatively, an integrated displacement sensor, such as a laser displacement sensor, etc., may also be used, and the integrated displacement sensor 4 is set on the top of the rolling mill arch 7, and the detection end (such as a laser reflection end) of the displacement sensor 4 is directed toward the end of the guide rod 6 away from the piston 2 to measure the movement displacement of the guide rod 6.

[0035] Specifically, the guide rod 6 passes through the rolling mill arch 7 and the cylinder body 1, that is, the length of the guide rod 6 is greater than or equal to the sum of the lengths of the rolling mill arch 7 and the cylinder body 1, so that the end of the guide rod 6 away from the piston 2 is arranged on the rolling mill arch 7 or is flush with the end surface of the rolling mill arch 7 away from the cylinder body 1, and then the displacement sensor 4 is installed and then the outside of the cylinder is pressed down.

[0036] In this embodiment, the cylinder body 1 is arranged at the bottom of the rolling mill arch 7, and the rolling mill arch 7 can provide a certain support force and fixing effect for the cylinder body 1. The open end of the cylinder body 1 is away from the bottom of the rolling mill arch 7, and the piston 2 is arranged at the open end of the cylinder body 1. The end of the piston 2 away from the cylinder body 1 is provided with a cavity 21 for placing the pressure gauge 3. The cavity 21 after the pressure gauge 3 is installed can be closed by using a pressure pad 5 to prevent the pressure gauge 3 from falling during the operation of the pressing cylinder. The pressure gauge 3 is arranged in the pressing cylinder through the cavity 21 and the pressure pad 5, which avoids damage to the pressure gauge 3 caused by the complex working environment outside the pressing cylinder and the problem of being unable to install, thereby improving the service life and convenience of the pressure gauge 3, and increasing the applicability of the pressing cylinder. Pressure gauges 3 of different sizes can be placed in the cavity 21. At the same time, one end of the guide rod 6 is connected to the piston 2, and the other end is provided with the movable end of the displacement sensor 4, and the guide rod passes through the rolling mill arch 7 and the cylinder body 1, so that the end of the guide rod 6 away from the piston 2 extends out of the depression cylinder. For example, the end of the guide rod 6 away from the piston 2 is arranged on the rolling mill arch 7 or is flush with the end surface of the rolling mill arch 7 away from the cylinder body 1, so that the movable end of the displacement sensor 4 is connected to the outside of the depression cylinder, and the fixed end of the displacement sensor 4 is arranged on the top of the rolling mill arch 7. Even if the displacement sensor 4 is arranged on the outside of the depression cylinder, it is helpful to repair and replace the displacement sensor 4, increase the convenience of use of the displacement sensor 4, and avoid the influence of the internal environment of the cylinder (such as heavy water vapor) on the displacement sensor, thereby improving the service life of the displacement sensor 4.

[0037] Optionally, the pressing cylinder also includes a portal frame 8, which includes a side plate 81 and a middle plate 82, the two side plates 81 are used to be spaced apart at the top of the rolling mill arch 7, the middle plate 82 is arranged between the two side plates 81, and the fixing part of the displacement sensor 4 is arranged on the middle plate 82.

[0038] Specifically, the portal frame 8 is arranged on the top of the rolling mill arch 7 and is used to fix the fixing part of the displacement sensor 4. Figure 1 As shown, the portal frame 8 includes two side plates 81 and a middle plate 82. The two side plates 81 are respectively arranged on both sides of the top guide rod 6 of the rolling mill arch 7, and the middle plate 82 is arranged between the two side plates 81. The middle plate 82 corresponds to the end of the guide rod 6. The fixed part of the displacement sensor 4 is arranged on the middle plate 82 so that the fixed part of the displacement sensor 4 faces the end of the guide rod 6, thereby detecting the movement displacement of the guide rod 6.

[0039] Optionally, the guide rod 6 includes a first guide rod 61 and a second guide rod 62, one end of the first guide rod 61 is connected to the piston 2, the other end of the first guide rod 61 is used to extend into the rolling mill arch 7, the second guide rod 62 is arranged in the rolling mill arch 7, and the end of the first guide rod 61 extending into the rolling mill arch 7 is detachably connected to the second guide rod 62.

[0040] Specifically, since the existing guide rods are of limited length, their ends are both in the depression cylinder. In order to set the end of the guide rod 6 in the depression cylinder, the guide rod 6 is set on a first guide rod 61 and a second guide rod 62 that are detachably connected to increase the length of the guide rod 6. The bottom end of the first guide rod 61 is connected to the piston 2 in the depression cylinder, and the other end is detachably connected to the second guide rod 62. The second guide rod 62 is set in the rolling mill arch 7.

[0041] Optionally, the depression cylinder further includes a bushing 9 , which is disposed between the rolling mill arch 7 and the cylinder body 1 , and the first guide rod 61 passes through the bushing 9 .

[0042] Specifically, the bushing 9 is fixed between the cylinder body 1 and the rolling mill arch 7 by a plurality of bolts, and the first guide rod 61 is passed through the bushing 9 to ensure the normal operation of the first guide rod 61 in the cylinder body 1 and the rolling mill arch 7 .

[0043] Optionally, the first guide rod 61 and the second guide rod 62 are connected by threads, and the pressing cylinder also includes a stop assembly 10, which is connected between the first guide rod 61 and the second guide rod 62, and the stop assembly 10 is used to prevent the threads of the first guide rod 61 and the second guide rod 62 from loosening.

[0044] Specifically, a connection hole is provided at the end where the first guide rod 61 and the second guide rod 62 are connected, a first thread is provided inside the connection hole, the diameter of the second guide rod 62 is smaller than that of the first guide rod 61, the outer surface of the end where the second guide rod 62 and the first guide rod 61 are connected is provided with a second thread matching the first thread, or a connection portion is provided at the end where the second guide rod 62 and the first guide rod 61 are connected, the outer surface of the connection portion is provided with a second thread matching the first thread, and the first guide rod 61 and the second guide rod 62 are threadedly connected by the first thread and the second thread. In order to prevent the threaded connection between the first guide rod 61 and the second guide rod 62 from loosening during continuous operation, a stopper assembly 10 is provided between the first guide rod 61 and the second guide rod 62 to prevent the threaded connection between the first guide rod 61 and the second guide rod 62 from loosening and causing the connection to be disconnected, thereby achieving thread anti-loosening. In this embodiment, the brake assembly includes a first connecting plate and a second connecting plate that are connected to each other, and the first connecting plate is larger than the second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the ends where the first guide rod 61 and the second guide rod 62 are connected, and the stop assembly 10 is fixed to the second guide rod 62 by bolts and connecting holes opened on the first connecting plate.

[0045] Optionally, the depression cylinder further includes a lower pad 11 , and the lower pad 11 is arranged between the pressure pad 5 and the pressure gauge 3 .

[0046] Optionally, the depression cylinder further includes an upper pad 12 , and the upper pad 12 is disposed between the pressure gauge 3 and the piston 2 .

[0047] Specifically, since different types of pressure gauges 3 have different sizes, when they are installed in the bore 21, shaking is likely to occur, which may lead to inaccurate monitoring data or damage to the pressure gauge 3. For this reason, a lower pad 11 and an upper pad 12 are provided. The lower pad 11 is provided between the pressure pad 5 and the pressure gauge 3, and the upper pad 12 is provided between the pressure gauge 3 and the piston 2. The pressure pad 5 is fastened to the opening of the bore 21 of the piston 2 by a number of bolts, thereby compacting the lower pad 11, the pressure gauge 3 and the upper pad 12 to fix the pressure gauge 3. It should be noted that the upper pad 12 and the lower pad 11 can be used separately, that is, the corresponding pads can be selected according to the size of the pressure gauge 3 used in actual operation and the size of the bore 21. In order to detect the pressure value more accurately, the pressure gauge 3 is usually directly contacted with the piston 2, that is, the pressure gauge 3 is provided on the piston 2, and the pressure gauge 3 is fixed by the lower pad 11.

[0048] Optionally, a wire outlet hole 13 is formed on the side wall of the piston 2 , and the wire outlet hole 13 is communicated with the cavity 21 .

[0049] Specifically, since the pressure gauge 3 needs to be connected to a power source or a controller and other devices when in use, a wire outlet hole 13 connected to the cavity 21 is opened on the side wall of the piston 2. Through the wire outlet hole 13, the pressure gauge 3 is connected to an external controller and other devices to ensure the normal operation of the pressure gauge 3.

[0050] Optionally, the pressing cylinder also includes a cylinder cover 14, which is detachably connected to the end face of the cylinder body 1 away from the rolling mill arch 7, that is, the cylinder cover 14 is connected to the cylinder body 1 by a plurality of bolts, and an oil circuit is opened on the cylinder cover 14, and the oil circuit is connected to the inside of the cylinder body 1.

[0051] The embodiment of the present invention provides a hot rolling mill group, including a rolling mill arch and the pressing cylinder as described above.

[0052] The beneficial effects of the hot rolling mill of this embodiment relative to the prior art are the same as those of the above-mentioned depression cylinder, and will not be described in detail here.

[0053] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A pressing cylinder, characterized in that: include: Cylinder body (1), piston (2), pressure gauge (3), displacement sensor (4), pressure pad (5) and guide rod (6); The cylinder body (1) is used to be connected to the bottom of the rolling mill arch (7), and the open end of the cylinder body (1) faces away from the bottom of the rolling mill arch (7); The piston (2) is movably connected to the open end of the cylinder (1); a cavity (21) is provided at one end of the piston (2) away from the cylinder (1); the pressure gauge (3) is arranged in the cavity (21); the pressure pad (5) is connected to the end of the piston (2) away from the cylinder (1), and the pressure pad (5) is used to close the cavity (21); The guide rod (6) is used to penetrate the rolling mill arch (7) and the cylinder body (1), and is connected to the piston (2); The fixed part of the displacement sensor (4) is used to be arranged on the top of the rolling mill arch (7), and the movable part of the displacement sensor (4) is connected to an end of the guide rod (6) away from the piston (2).

2. The pressing cylinder according to claim 1, characterized in that: It also includes a portal frame (8), the portal frame (8) including side plates (81) and a middle plate (82), the two side plates (81) being used to be arranged at intervals on the top of the rolling mill arch (7), the middle plate (82) being arranged between the two side plates (81), and the fixing part of the displacement sensor (4) being arranged on the middle plate (82).

3. The pressing cylinder according to claim 1, characterized in that: The guide rod (6) comprises a first guide rod (61) and a second guide rod (62); one end of the first guide rod (61) is connected to the piston (2); the other end of the first guide rod (61) is used to extend into the rolling mill arch (7); the second guide rod (62) is arranged in the rolling mill arch (7); and the end of the first guide rod (61) extending into the rolling mill arch (7) is detachably connected to the second guide rod (62).

4. The pressing cylinder according to claim 3, characterized in that: It also includes a bushing (9), wherein the bushing (9) is arranged between the rolling mill arch (7) and the cylinder body (1), and the first guide rod (61) is passed through the bushing (9).

5. The pressing cylinder according to claim 3, characterized in that: The first guide rod (61) and the second guide rod (62) are connected by threads, and the pressing cylinder further comprises a stop assembly (10). The stop assembly (10) is connected between the first guide rod (61) and the second guide rod (62), and the stop assembly (10) is used to prevent the threads of the first guide rod (61) and the second guide rod (62) from loosening.

6. The pressing cylinder according to claim 1, characterized in that: It also comprises a lower pad (11), wherein the lower pad (11) is arranged between the pressure pad (5) and the pressure measuring instrument (3).

7. The pressing cylinder according to claim 1, characterized in that: It also comprises an upper pad (12), wherein the upper pad (12) is arranged between the pressure gauge (3) and the piston (2).

8. The pressing cylinder according to claim 1, characterized in that: A wire outlet hole (13) is provided on the side wall of the piston (2), and the wire outlet hole (13) is communicated with the cavity (21).

9. The pressing cylinder according to claim 1, characterized in that: It also includes a cylinder cover (14), which is detachably connected to the end surface of the cylinder body (1) away from the rolling mill arch (7), and an oil circuit is opened on the cylinder cover (14), and the oil circuit is connected to the inner cavity of the cylinder body (1).

10. A hot rolling mill, characterized in that: It comprises a rolling mill arch (7) and a pressing cylinder as claimed in any one of claims 1 to 9.

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