Stroke self-detection loading oil cylinder and coal mill system

Abstract

The utility model relates to the technical field of coal mill hydraulic loading systems, in particular to a stroke self-detection loading oil cylinder and a coal mill system.The stroke self-detection loading oil cylinder comprises a telescopic unit, the telescopic unit comprises a cylinder body, a piston is arranged in the cylinder body in a sliding mode, the piston divides the interior of the cylinder body into a first cavity and a second cavity, and the first cavity is communicated with the second cavity; a driving rod is arranged in the first cavity, one end of the driving rod is connected with the piston, and the other end of the driving rod extends out of the barrel in the axis direction of the barrel; the driving unit is respectively communicated with the first cavity and the second cavity and is used for driving the piston to do reciprocating motion along the axis of the barrel body; and the detection unit is arranged on the barrel body, is connected with the driving rod and is used for detecting the displacement stroke of the driving rod and outputting the displacement value of the driving rod in real time, and when the stroke self-detection loading oil cylinder is applied to a coal mill system, the grinding roller of the coal mill can be loaded to an accurate working position according to the detected displacement value, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mill hydraulic loading systems, in particular to a stroke self-detecting loading oil cylinder and a coal mill system. Background Art

[0002] The hydraulic loading system is widely used in medium-speed roller coal mills in cement, steel, chemical, thermal power plants, etc. The on-site grinding rollers are connected to the oil cylinder through a pressure frame and a pull rod. At present, the upper and lower limits are combined with the mechanical displacement scale indication to collect the signals of the grinding rollers being raised and lowered and measure the thickness of the coal seam inside the coal mill. In addition, the grinding rollers on some sites are lowered to the default position 15 seconds after the roller lowering instruction is executed. Therefore, there is a large error in the on-site indication signal. When the grinding roller is overloaded, the grinding roller and the grinding table are in contact, which will cause the coal mill to vibrate too much. When the grinding roller is not loaded in place, the grinding pressure applied by the grinding roller to the coal seam is insufficient, and insufficient grinding will occur, which seriously affects the production quality and production efficiency. The oil cylinder of the prior art can only realize the loading and lifting functions of the grinding roller, but cannot detect the displacement stroke of the oil cylinder in real time, resulting in the oil cylinder being unable to load the grinding roller to the accurate working position. Therefore, a stroke self-detection loading oil cylinder and coal mill system are urgently needed. Utility Model Content

[0003] To this end, the utility model provides a stroke self-detecting loading oil cylinder and a coal mill system, which are used to overcome the problem in the prior art that the oil cylinder cannot detect the displacement stroke in real time and cannot load the grinding roller to the accurate working position.

[0004] To achieve the above-mentioned purpose, the utility model provides a stroke self-detecting loading cylinder in a first aspect, comprising:

[0005] The telescopic unit comprises a cylinder, a piston is slidably arranged in the cylinder, the piston divides the interior of the cylinder into a first cavity and a second cavity, a driving rod is arranged in the first cavity, one end of the driving rod is connected to the piston, and the other end extends to the outside of the cylinder along the axis direction of the cylinder;

[0006] A driving unit, which is in communication with the first cavity and the second cavity respectively, and is used to drive the piston to reciprocate along the axis of the cylinder;

[0007] The detection unit is arranged on the cylinder and connected to the driving rod, and is used for detecting the displacement stroke of the driving rod and outputting the displacement value of the driving rod in real time.

[0008] Furthermore, the detection unit comprises:

[0009] A guide rail, which is parallel to the axis of the cylinder and fixed to the outer wall of the cylinder through a support frame, and a magnetic slider is slidably connected to the guide rail, and the magnetic slider is connected to the driving rod through a connecting assembly;

[0010] A magnetic field generator, which is arranged on one side of the guide rail and fixedly connected to the support frame;

[0011] A magnetostrictive sensor is mounted on the magnetic slider and is used to sense changes in the magnetic field and convert the changes in the magnetic field into electrical signals. An output end of the magnetostrictive sensor is electrically connected to a signal processor, which is used to receive the electrical signal transmitted by the magnetostrictive sensor and convert the electrical signal into a displacement value of the driving rod.

[0012] Furthermore, the connecting assembly includes a first connecting rod, which is parallel to the axis of the cylinder, one end of which is fixedly connected to the magnetic slider, and the other end is fixedly connected to a second connecting rod perpendicular to it, and the second connecting rod is fixedly connected to a driving rod located outside the cylinder through a retaining ring.

[0013] Furthermore, a first valve body communicating with the first cavity and a second valve body communicating with the second cavity are provided on the side wall of the cylinder.

[0014] Furthermore, the driving unit comprises:

[0015] An oil storage tank, which is used to store oil, and an output port of the oil storage tank is connected to an oil pump;

[0016] The electromagnetic reversing valve has an input end connected to the output end of the oil pump, and an output end connected to the first valve body and the second valve body respectively.

[0017] Furthermore, an accumulator is provided on one side of the cylinder, and the accumulator is connected to the first cavity through an oil pipe.

[0018] Furthermore, a sealing ring is sleeved on the side wall of the piston, and the sealing ring is in sliding contact with the inner wall of the cylinder.

[0019] Furthermore, an end cover is fixedly mounted on the port of the cylinder, and an opening matching the outer diameter of the driving rod is formed on the end cover.

[0020] Furthermore, an earring is fixedly connected to one end of the barrel away from the port.

[0021] A second aspect of the utility model provides a coal mill system, wherein the coal mill system comprises the stroke self-detection loading cylinder as described above.

[0022] Compared with the prior art, the beneficial effect of the utility model lies in that the piston and the driving rod are driven to reciprocate along the axis of the cylinder by the driving unit, and since the detection unit is connected to the driving rod, the displacement stroke of the driving rod can be detected and the displacement value of the driving rod can be output, and the stroke self-detection loading cylinder can not only realize the loading function but also detect the displacement stroke of the driving rod in real time; when the stroke self-detection loading cylinder is applied to the coal mill system, the grinding roller of the coal mill can be loaded to the accurate working position according to the detected displacement value, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a coal mill system provided by the utility model;

[0024] Figure 2 A structural schematic diagram of the stroke self-detection loading cylinder provided by the utility model;

[0025] Figure 3 for Figure 2 A schematic diagram of the structure of the detection unit in FIG.

[0026] Figure 4 for Figure 3 Side view of

[0027] Figure 5 for Figure 2 A schematic diagram of the structure of the middle telescopic unit in the extended state;

[0028] Figure 6 for Figure 2 A schematic diagram of the structure of the middle telescopic unit in a shortened state;

[0029] Figure 7 for Figure 2 A cross-sectional view of the middle structure;

[0030] Numbers in the figure:

[0031] 1. Telescopic unit; 11. Driving rod; 12. End cover; 13. Accumulator; 14. Earring; 15. First valve body; 16. Second valve body; 17. Cylinder; 18. Oil pipe; 19. Piston; 2. Detection unit; 21. Magnetic slider; 22. Guide rail; 23. First connecting rod; 24. Second connecting rod; 25. Snap ring; 26. Fisheye joint; 27. Support frame; 3. Pull rod; 4. Mounting frame; 5. Grinding roller; 6. Grinding table. DETAILED DESCRIPTION

[0032] In order to make the purpose and advantages of the utility model more clearly understood, the utility model is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] Example 1

[0037] See also Figure 1-Figure 7 As shown, this embodiment provides a stroke self-detecting loading cylinder with a novel embodiment, including:

[0038] The telescopic unit 1 comprises a cylinder 17, a piston 19 is slidably disposed in the cylinder 17, the piston 19 divides the interior of the cylinder 17 into a first cavity and a second cavity, a driving rod 11 is disposed in the first cavity, one end of the driving rod 11 is connected to the piston 19, and the other end extends to the outside of the cylinder 17 along the axis direction of the cylinder 17;

[0039] A driving unit, which is in communication with the first cavity and the second cavity respectively, and is used to drive the piston 19 to reciprocate along the axis of the cylinder 17;

[0040] The detection unit 2 is disposed on the cylinder 17 and connected to the driving rod 11 , and is used to detect the displacement stroke of the driving rod 11 and output the displacement value of the driving rod 11 in real time.

[0041] Specifically, the piston 19 and the drive rod 11 can be driven to reciprocate along the axis of the cylinder through the driving unit. Since the detection unit 2 is connected to the drive rod 11, the displacement stroke of the drive rod 11 can be detected and the displacement value of the drive rod 11 can be output. The stroke self-detection loading cylinder can not only realize the loading function but also detect the displacement stroke of the drive rod 11 in real time. When the stroke self-detection loading cylinder is applied to the coal mill system, the grinding roller 5 of the coal mill can be loaded to the accurate working position according to the detected displacement value, thereby improving production efficiency.

[0042] See also Figure 2 to Figure 4 As shown, in the embodiment of the utility model, the detection unit 2 includes:

[0043] A guide rail 22, which is parallel to the axis of the cylinder and fixed to the outer wall of the cylinder through a support frame 27, and a magnetic slider 21 is slidably connected to the guide rail 22, and the magnetic slider 21 is connected to the driving rod 11 through a connecting assembly;

[0044] A magnetic field generator, which is disposed on one side of the guide rail 22 and fixedly connected to the support frame 27;

[0045] The magnetostrictive sensor is installed on the magnetic slider 21, and is used to sense the change of the magnetic field and convert the change of the magnetic field into an electrical signal. Its output end is electrically connected to a signal processor, and the signal processor is used to receive the electrical signal transmitted by the magnetostrictive sensor and convert the electrical signal into the displacement value of the driving rod 11.

[0046] Specifically, the support frame 27 is fixedly mounted on the outer wall of the cylinder by bolts.

[0047] Specifically, the magnetic field generator is used to generate a magnetic field. When the magnetic slider 21 moves along the guide rail 22, the magnetic field will change. At this time, the length of the magnetostrictive material in the magnetostrictive displacement sensor will change with the change of the magnetic field, so that the magnetostrictive displacement sensor can detect the change of the magnetic field and convert the change of the magnetic field into an electrical signal, which is then transmitted to the signal processor. The signal processor converts the electrical signal into the displacement value of the drive rod 11.

[0048] In an embodiment of the utility model, the connecting assembly includes a first connecting rod 23, which is parallel to the axis of the cylinder, one end of which is fixedly connected to the magnetic slider 21, and the other end is fixedly connected to a second connecting rod 24 perpendicular to it, and the second connecting rod 24 is fixedly connected to the driving rod 11 located outside the cylinder through a retaining ring 25.

[0049] Specifically, the first connecting rod 23 and the second connecting rod 24 are fixedly connected via a fisheye joint 26 ; and the clamping ring 25 is fixedly sleeved on the side wall of the driving rod 11 .

[0050] See also Figure 2 and Figure 7 As shown, in the embodiment of the utility model, a first valve body 15 communicating with the first cavity and a second valve body 16 communicating with the second cavity are arranged on the side wall of the cylinder 17 .

[0051] In an embodiment of the utility model, the driving unit comprises:

[0052] An oil storage tank, which is used to store oil, and an output port of the oil storage tank is connected to an oil pump;

[0053] The electromagnetic reversing valve has an input end connected to the output end of the oil pump, and an output end connected to the first valve body 15 and the second valve body 16 respectively.

[0054] Specifically, the oil pump transports oil from the oil storage tank to the electromagnetic reversing valve, and the oil flows into the cylinder 17 through the electromagnetic reversing valve.

[0055] Specifically, the electromagnetic reversing valve has a first working state and a second working state. When in the first working state, the electromagnetic reversing valve allows the oil to flow into the second cavity through the second valve body 16, and allows the oil to flow out of the first cavity through the first valve body 15. When in the second working state, the electromagnetic reversing valve allows the oil to flow into the first cavity through the first valve body 15, and allows the oil to flow out of the second cavity through the second valve body 16.

[0056] Specifically, if Figure 5 and Figure 6 As shown, when the electromagnetic reversing valve is switched to the first working state, the telescopic unit is extended, and when it is switched to the second working state, the telescopic unit is contracted.

[0057] In the embodiment of the utility model, an accumulator 13 is disposed on one side of the cylinder 17 , and the accumulator 13 is connected to the first cavity through an oil pipe 18 .

[0058] Specifically, when additional pressure is required in the first cavity, the accumulator 13 releases energy into the first cavity to ensure smooth operation of the loading cylinder.

[0059] In the embodiment of the utility model, a sealing ring is sleeved on the side wall of the piston 19, and the sealing ring is in sliding contact with the inner wall of the cylinder.

[0060] Specifically, the sealing ring can prevent liquid from flowing between the first cavity and the second cavity.

[0061] In the embodiment of the utility model, an end cover 12 is fixedly installed at the port of the cylinder, and an opening matching the outer diameter of the driving rod 11 is formed on the end cover 12 .

[0062] Specifically, a seal is provided between the inner wall of the opening and the outer wall of the driving rod 11 to ensure the sealing performance of the stroke self-detection loading cylinder.

[0063] In the embodiment of the utility model, an earring 14 is fixedly connected to one end of the cylinder away from the port.

[0064] Example 2

[0065] See also Figure 1 As shown, based on Example 1, an embodiment of the utility model provides a coal mill system, which includes the stroke self-detection loading cylinder as described in Example 1.

[0066] Specifically, the coal mill system includes a grinding table 6, which can rotate around its own axis. The stroke self-detection loading cylinder is arranged on one side of the grinding table 6, and the axes of the two are parallel to each other.

[0067] Specifically, a mounting seat is provided on one side of the grinding table 6 , and the mounting seat and the earring 14 are fixedly connected.

[0068] Specifically, the driving rod 11 is connected to the mounting frame 4 through the pull rod 3, the mounting frame 4 and the pull rod 3 are perpendicular to each other, the mounting frame 4 is located above the grinding table 6, and a plurality of grinding rollers 5 are arranged at the bottom of the grinding frame. The grinding rollers 5 can rotate around their own axes, and the axes of the grinding rollers 5 and the axes of the grinding table 6 form a preset angle.

[0069] Specifically, among the angles formed by the axis of the grinding roller 5 and the axis of the grinding table 6 , the angle toward the grinding table 6 is an acute angle.

[0070] Specifically, the stroke self-detecting loading cylinder is used to drive the grinding roller 5 to a preset position, which includes a first position, a second position and a third position; when the grinding roller 5 is in the first position, the grinding roller 5 is in contact with the grinding table 6, and when it is in the second position, the grinding roller 5 is in contact with the coal material, applying grinding pressure to the coal material, and when it is in the third position, there is a feeding space between the grinding roller 5 and the grinding table 6, which is convenient for feeding coal material onto the grinding table 6.

[0071] Specifically, the coal mill system also includes a control system, which is electrically connected to the detection unit 2 of the stroke self-detection loading cylinder. The control system calculates the coal seam thickness, the wear value of the grinding roller 5 and the roller lowering stroke according to the displacement value fed back by the detection unit 2.

[0072] Specifically, the process of calculating the coal seam thickness, the wear value of the grinding roller 5 and the roller lowering stroke includes:

[0073] Acquire a first displacement value, where the first displacement value is a displacement value of the driving rod 11 when the grinding roller 5 is in the first working position;

[0074] Calculate the wear value of the grinding roller 5, wear value = reference point value - first displacement value, the reference point value is the displacement value of the driving rod 11 when the driving rod 11 and the mounting frame 4 are connected by the pull rod 3, at this time the top end of the driving rod 11 is flush with the top surface of the grinding table 6;

[0075] Acquire a second displacement value, where the second displacement value is a displacement value of the driving rod 11 when the grinding roller 5 is in the second working position;

[0076] Calculate the coal seam thickness, coal seam thickness = second displacement value - reference point value;

[0077] Acquire a third displacement value, where the third displacement value is a displacement value of the driving rod 11 when the grinding roller 5 is in the third working position;

[0078] Calculate the roller drop stroke, roller drop stroke = third displacement value - reference value - coal seam thickness + wear value.

[0079] In the embodiment of the utility model, the travel range of the driving rod 11 of the stroke self-detection loading cylinder is 0-400mm, the travel range of the magnetic slider 21 of the detection unit 2 is 0-430mm, and the control system is a DCS control system (Distributed Control System).

[0080] Specifically, when the driving rod 11 and the mounting frame 4 are connected by the pull rod 3, the top end of the driving rod 11 is flush with the top surface of the grinding table 6, the displacement value of the driving rod 11 is 150 mm, the grinding roller 5 is switched to the first station, and the first displacement value is obtained as 140 mm, and the wear value of the grinding roller 5 is calculated to be 10 mm; the grinding roller 5 is switched to the second station, and the second displacement value is obtained as 200, and the coal seam thickness is calculated to be 50 mm; the grinding roller 5 is switched to the third station, and the third displacement value is obtained as 260 mm, and the roller lowering stroke is calculated to be 70 mm. By setting the stroke self-detection loading cylinder in the coal mill system, the wear value of the grinding roller 5, the coal seam thickness and the roller lowering stroke can be calculated.

[0081] Specifically, when the coal mill system is working, the grinding roller 5 is switched to the third station, coal is put on the grinding table 6, the grinding table 6 rotates around its own axis, and the coal put on the grinding table 6 is spread evenly by centrifugal force. According to the calculated roller lowering stroke, the grinding roller 5 is switched to the second station, and grinding pressure is applied to the coal. Each of the grinding rollers 5 rotates around its own axis and cooperates with the grinding table 6 to grind the coal into powder. Compared with the prior art, by setting the stroke self-detection loading cylinder in the coal mill system, the roller lowering stroke can be accurately calculated, so that the stroke self-detection loading cylinder can load the grinding roller 5 to the accurate working position, avoiding overloading or underloading, thereby improving production quality and production efficiency; in addition, the wear value of the grinding roller 5 can be calculated, and there is no need to stop the machine and manually detect the wear value, which reduces maintenance costs.

[0082] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A stroke self-detecting loading cylinder, characterized in that: include: A telescopic unit (1) comprises a cylinder (17), a piston (19) being slidably disposed in the cylinder (17), the piston (19) dividing the interior of the cylinder (17) into a first cavity and a second cavity, a driving rod (11) being disposed in the first cavity, one end of the driving rod (11) being connected to the piston (19), and the other end extending to the outside of the cylinder (17) along the axial direction of the cylinder (17); a driving unit, which is in communication with the first cavity and the second cavity respectively, and is used to drive the piston (19) to reciprocate along the axis of the cylinder (17); A detection unit (2) is arranged on the cylinder (17) and connected to the driving rod (11), and is used to detect the displacement stroke of the driving rod (11) and output the displacement value of the driving rod (11) in real time.

2. The stroke self-detecting loading cylinder according to claim 1, characterized in that: The detection unit (2) comprises: A guide rail (22) parallel to the axis of the cylinder (17) and fixed to the outer wall of the cylinder (17) via a support frame (27); a magnetic slider (21) is slidably connected to the guide rail (22); and the magnetic slider (21) is connected to the driving rod (11) via a connecting assembly; a magnetic field generator, which is arranged on one side of the guide rail (22) and fixedly connected to the support frame (27); A magnetostrictive sensor is mounted on the magnetic slider (21) and is used to sense changes in the magnetic field and convert the changes in the magnetic field into electrical signals. An output end of the magnetostrictive sensor is electrically connected to a signal processor. The signal processor is used to receive the electrical signal transmitted by the magnetostrictive sensor and convert the electrical signal into a displacement value of the drive rod (11).

3. The stroke self-detecting loading cylinder according to claim 2, characterized in that: The connecting assembly comprises a first connecting rod (23) which is parallel to the axis of the cylinder (17), one end of which is fixedly connected to the magnetic slider (21), and the other end of which is fixedly connected to a second connecting rod (24) perpendicular to the first connecting rod (23), and the second connecting rod (24) is fixedly connected to a driving rod (11) located outside the cylinder (17) via a retaining ring (25).

4. The stroke self-detecting loading cylinder according to claim 1, characterized in that: A first valve body (15) communicating with the first cavity and a second valve body (16) communicating with the second cavity are arranged on the side wall of the cylinder (17).

5. The stroke self-detecting loading cylinder according to claim 4, characterized in that: The driving unit comprises: An oil storage tank, which is used to store oil, and an output port of the oil storage tank is connected to an oil pump; An electromagnetic reversing valve has an input end connected to an output end of the oil pump, and an output end connected to the first valve body (15) and the second valve body (16) respectively.

6. The stroke self-detecting loading cylinder according to claim 5, characterized in that: An accumulator (13) is provided on one side of the cylinder (17), and the accumulator (13) is connected to the first cavity through an oil pipe (8).

7. The stroke self-detecting loading cylinder according to claim 6, characterized in that: A sealing ring is sleeved on the side wall of the piston (19), and the sealing ring is in sliding contact with the inner wall of the cylinder (17).

8. The stroke self-detecting loading cylinder according to claim 7, characterized in that: An end cover (12) is fixedly mounted on the port of the cylinder (17), and an opening matching the outer diameter of the driving rod (11) is formed on the end cover (12).

9. The stroke self-detecting loading cylinder according to claim 8, characterized in that: An earring (14) is fixedly connected to one end of the cylinder (17) away from the port.

10. A coal mill system, characterized in that: The coal mill system includes a stroke self-detecting loading cylinder as described in any one of claims 1-9.

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