Hydraulic cylinder sealing tool and system of medium-speed coal mill

Abstract

The utility model provides a hydraulic cylinder sealing tool and system of a medium-speed coal mill, the hydraulic cylinder sealing tool of the medium-speed coal mill comprises a sealing ring, the inner side wall of the sealing ring is attached to the side wall of a piston rod of a hydraulic cylinder, and the bottom surface of the sealing ring is attached to the top surface of an end cover of the hydraulic cylinder; a temporary oil storage cavity of an annular structure is formed in the inner side wall of the sealing ring, the bottom face of the temporary oil storage cavity and the bottom face of the sealing ring are located on the same plane, an oil discharging channel is formed in the sealing ring, one end of the oil discharging channel is communicated with the temporary oil storage cavity, and the other end of the oil discharging channel is arranged on the outer side wall of the sealing ring. A hydraulic cylinder sealing tool of a medium-speed coal mill comprises a sealing ring and a hydraulic cylinder. According to the utility model, on-site environment pollution and fire hazard and waste can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-speed coal mills, in particular to a hydraulic cylinder sealing tool and a system of a medium-speed coal mill. Background Art

[0002] In the existing medium-speed coal mill, the upward lifting or downward loading force generated by the hydraulic cylinder is transmitted to the grinding roller assembly through the pull rod. The hydraulic cylinder lifts the grinding roller assembly upward to facilitate the cleaning work after the medium-speed coal mill is operated. The hydraulic cylinder loads the grinding roller assembly downward to provide pressure for the grinding roller assembly, thereby grinding the raw coal on the grinding disc into coal powder that meets the standards.

[0003] During the operation of the medium-speed coal mill, the loading pressure of the upper cylinder of the hydraulic cylinder is about 10MPa, and the back pressure of the lower cylinder of the hydraulic cylinder is about 2MPa. A dynamic sealing device is provided at the connection between the piston rod and the end cover in the hydraulic cylinder. The piston rod makes reciprocating motion in the vertical direction relative to the end cover for a long time (about 2 times / second). The dynamic sealing device at the connection between the piston rod and the end cover is prone to wear and aging after the piston rod reciprocates for a long time. At the same time, dust and coal particles near the medium-speed coal mill will also be brought to the dynamic sealing device by the piston rod that reciprocates up and down. The dust and coal particles will cause wear and damage to the dynamic sealing device in a short time. If the dynamic sealing device is damaged, the high-pressure hydraulic oil in the upper cylinder of the hydraulic cylinder will easily leak from the connection between the piston rod and the end cover, which will not only pollute the on-site environment, but also cause fire hazards and waste. Utility Model Content

[0004] According to the technical problems raised above, a hydraulic cylinder sealing tool and system for a medium-speed coal mill are provided. The high-pressure hydraulic oil in the upper cylinder of the hydraulic cylinder is prevented from leaking from the connection between the piston rod and the end cover, thereby avoiding pollution of the on-site environment and causing fire hazards and waste. The technical means adopted by the utility model are as follows:

[0005] In the first aspect, a hydraulic cylinder sealing fixture of a medium-speed coal mill comprises a sealing ring whose axis is perpendicular to a horizontal plane and can be sleeved on the outside of a piston rod of a hydraulic cylinder, wherein an inner wall of the sealing ring is in contact with a side wall of the piston rod of the hydraulic cylinder, and a bottom surface of the sealing ring is in contact with a top surface of an end cover of the hydraulic cylinder; a temporary oil storage cavity of an annular structure is provided on the inner wall of the sealing ring along its circumferential direction, the bottom surface of the temporary oil storage cavity and the bottom surface of the sealing ring are located on the same plane, an oil discharge channel is provided on the sealing ring, one end of the oil discharge channel is connected to the temporary oil storage cavity, and the other end of the oil discharge channel is arranged on the outer wall of the sealing ring.

[0006] Furthermore, a first anti-oil leakage sealing ring installation groove with an annular structure is opened on the inner side wall of the sealing ring along its circumferential direction, and the first anti-oil leakage sealing ring installation groove is located above the temporary oil storage chamber. The first anti-oil leakage sealing ring installation groove is filled with a first anti-oil leakage sealing ring that fits with the side wall of the piston rod of the hydraulic cylinder.

[0007] Furthermore, a second anti-oil leakage sealing ring installation groove with an annular structure is opened on the bottom surface of the sealing ring, and the second anti-oil leakage sealing ring installation groove surrounds the periphery of the temporary oil storage cavity. The second anti-oil leakage sealing ring installation groove is filled with a second anti-oil leakage sealing ring that fits the top surface of the end cover of the hydraulic cylinder.

[0008] Furthermore, a dustproof sealing ring mounting groove with an annular structure is opened on the inner side wall of the sealing ring along its circumferential direction, and the dustproof sealing ring mounting groove is located above the first anti-oil leakage sealing ring mounting groove. The dustproof sealing ring mounting groove is filled with a dustproof sealing ring that fits the side wall of the piston rod of the hydraulic cylinder.

[0009] Furthermore, the sealing ring is composed of a first sealing ring assembly and a second sealing ring assembly, both of which are semi-annular structures; one end of the first sealing ring assembly is detachably connected to one end of the second sealing ring assembly, and the other end of the first sealing ring assembly is detachably connected to the other end of the second sealing ring assembly.

[0010] In a second aspect, a hydraulic cylinder sealing system for a medium-speed coal mill comprises a hydraulic cylinder, wherein the hydraulic cylinder comprises a cylinder body, an end cover and a piston rod, wherein the cylinder body is a cylindrical structure with an axis perpendicular to a horizontal plane, an open upper end and a closed lower end, the end cover is detachably covered on the opening at the upper end of the cylinder body, the end cover is provided with a mounting hole with an axis perpendicular to the horizontal plane, the piston rod is coaxially mounted in the mounting hole, and also comprises a hydraulic cylinder sealing fixture for a medium-speed coal mill as described in any one of the first aspects, wherein a sealing ring in the hydraulic cylinder sealing fixture for the medium-speed coal mill is sleeved on the outside of the piston rod of the hydraulic cylinder, the inner side wall of the sealing ring in the hydraulic cylinder sealing fixture for the medium-speed coal mill is in contact with the side wall of the piston rod of the hydraulic cylinder, and the bottom surface of the sealing ring in the hydraulic cylinder sealing fixture for the medium-speed coal mill is in contact with the top surface of the end cover of the hydraulic cylinder.

[0011] The utility model has the following advantages:

[0012] 1. The utility model comprises a sealing ring sleeved on the outside of the piston rod of the hydraulic cylinder, the inner side wall of the sealing ring is in contact with the side wall of the piston rod of the hydraulic cylinder, and the bottom surface of the sealing ring is in contact with the top surface of the end cover of the hydraulic cylinder; a temporary oil storage cavity is opened on the inner side wall of the sealing ring along its circumferential direction, the bottom surface of the temporary oil storage cavity and the bottom surface of the sealing ring are located on the same plane, and are used to store the high-pressure hydraulic oil leaked from the connection between the piston rod and the end cover. The high-pressure hydraulic oil in the temporary oil storage cavity is output to the oil storage barrel or refluxed to the oil tank of the hydraulic cylinder through the oil discharge channel, thereby avoiding pollution of the on-site environment and causing fire hazards and waste.

[0013] 2. In the utility model, a first anti-oil leakage sealing ring installation groove is provided on the inner side wall of the sealing ring, which is located above the temporary oil storage chamber. The first anti-oil leakage sealing ring installation groove is filled with a first anti-oil leakage sealing ring that fits the side wall of the piston rod of the hydraulic cylinder, which can prevent the high-pressure hydraulic oil in the temporary oil storage chamber from leaking out of the temporary oil storage chamber through the gap between the sealing ring and the piston rod.

[0014] 3. In the utility model, a second anti-oil leakage sealing ring installation groove surrounding the periphery of the temporary oil storage chamber is opened on the bottom surface of the sealing ring, and the second anti-oil leakage sealing ring installation groove is filled with a second anti-oil leakage sealing ring that fits the top surface of the end cover of the hydraulic cylinder, which can prevent the high-pressure hydraulic oil in the temporary oil storage chamber from leaking out of the temporary oil storage chamber through the gap between the sealing ring and the end cover.

[0015] 4. In the utility model, a dustproof sealing ring installation groove located above the first oil leakage prevention sealing ring installation groove is opened on the inner side wall of the sealing ring, and the dustproof sealing ring installation groove is filled with a dustproof sealing ring that fits the side wall of the piston rod of the hydraulic cylinder, which can prevent external dust and coal particles from entering the connection between the piston rod and the end cover through the gap between the sealing ring and the piston rod.

[0016] 5. In the utility model, the sealing ring is composed of a first sealing ring assembly and a second sealing ring assembly of a semi-annular structure, one end of the first sealing ring assembly is detachably connected to one end of the second sealing ring assembly, and the other end of the first sealing ring assembly is detachably connected to the other end of the second sealing ring assembly, so as to facilitate the installation of the sealing ring on the piston rod or the removal of the sealing ring from the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is a front view of a hydraulic cylinder sealing tool for a medium-speed coal mill in this embodiment;

[0019] Figure 2 It is a top view of a hydraulic cylinder sealing tooling of a medium-speed coal mill in this embodiment;

[0020] Figure 3 This is an overall structural diagram of a hydraulic cylinder sealing system of a medium-speed coal mill in this embodiment.

[0021] Figure markings: 1-second bolt hole; 2-oil drainage channel; 3-dustproof sealing ring installation groove; 4-first anti-oil leakage sealing ring installation groove; 5-first bolt hole; 6-positioning pin; 7-temporary oil storage chamber; 8-second anti-oil leakage sealing ring installation groove; 9-piston rod; 10-sealing ring; 11-end cover. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0023] First, as Figure 1 and Figure 2 As shown, a hydraulic cylinder sealing fixture of a medium-speed coal mill includes a sealing ring 10 whose axis is perpendicular to the horizontal plane and can be sleeved on the outside of the piston rod 9 of the hydraulic cylinder, the inner wall of the sealing ring 10 is in contact with the side wall of the piston rod 9 of the hydraulic cylinder, and the bottom surface of the sealing ring 10 is in contact with the top surface of the end cover 11 of the hydraulic cylinder; a temporary oil storage cavity 7 of an annular structure is provided on the inner wall of the sealing ring 10 along its circumferential direction, the bottom surface of the temporary oil storage cavity 7 and the bottom surface of the sealing ring 10 are located on the same plane, and an oil discharge channel 2 is provided on the sealing ring 10, one end of the oil discharge channel 2 is connected to the temporary oil storage cavity 7, and the other end of the oil discharge channel 2 is arranged on the outer wall of the sealing ring 10.

[0024] Specifically, one end of the oil discharge channel 2 disposed on the outer side wall of the sealing ring 10 is connected to one end of an oil outlet pipe, and the other end of the oil outlet pipe is connected to the oil tank of the hydraulic cylinder.

[0025] The temporary oil storage chamber 7 is used to store the high-pressure hydraulic oil leaking from the connection between the piston rod 9 and the end cover 11. The high-pressure hydraulic oil in the temporary oil storage chamber 7 flows back to the oil tank of the hydraulic cylinder through the oil discharge channel 2 and the oil outlet pipe, which can not only avoid polluting the on-site environment and causing fire hazards and waste, but also avoid the oil level in the oil tank of the hydraulic cylinder being too low, resulting in the need to frequently refill the oil tank.

[0026] Specifically, the sealing ring 10 is fixed to the end cover 11 of the hydraulic cylinder through the first bolts and the first bolt holes 5 .

[0027] In this embodiment, a first anti-oil leakage sealing ring installation groove 4 with an annular structure is opened on the inner wall of the sealing ring 10 along its circumferential direction. The first anti-oil leakage sealing ring installation groove 4 is located above the temporary oil storage chamber 7. The first anti-oil leakage sealing ring installation groove 4 is filled with a first anti-oil leakage sealing ring that fits the side wall of the piston rod 9 of the hydraulic cylinder.

[0028] Specifically, the first anti-oil leakage sealing ring is a U-shaped ring, and the first anti-oil leakage sealing ring installation groove 4 and the first anti-oil leakage sealing ring cooperate to prevent the high-pressure hydraulic oil in the temporary oil storage chamber 7 from leaking from the temporary oil storage chamber 7 through the gap between the sealing ring 10 and the piston rod 9.

[0029] In this embodiment, a second anti-oil leakage sealing ring installation groove 8 with an annular structure is opened on the bottom surface of the sealing ring 10, and the second anti-oil leakage sealing ring installation groove 8 surrounds the periphery of the temporary oil storage chamber 7. The second anti-oil leakage sealing ring installation groove 8 is filled with a second anti-oil leakage sealing ring that fits the top surface of the end cover 11 of the hydraulic cylinder.

[0030] Specifically, the second anti-oil leakage sealing ring is an O-ring, and the second anti-oil leakage sealing ring installation groove 8 cooperates with the second anti-oil leakage sealing ring to prevent the high-pressure hydraulic oil in the temporary oil storage chamber 7 from leaking from the temporary oil storage chamber 7 through the gap between the sealing ring 10 and the end cover 11.

[0031] In this embodiment, a dustproof sealing ring mounting groove 3 with an annular structure is opened on the inner side wall of the sealing ring 10 along its circumferential direction. The dustproof sealing ring mounting groove 3 is located above the first anti-oil leakage sealing ring mounting groove 4. The dustproof sealing ring mounting groove 3 is filled with a dustproof sealing ring that fits the side wall of the piston rod 9 of the hydraulic cylinder.

[0032] The dustproof sealing ring installation groove 3 cooperates with the dustproof sealing ring to prevent external dust and coal particles from entering the connection between the piston rod 9 and the end cover 11 through the gap between the sealing ring 10 and the piston rod 9.

[0033] In this embodiment, the sealing ring 10 is composed of a first sealing ring assembly and a second sealing ring assembly, both of which are semi-annular structures; one end of the first sealing ring assembly is detachably connected to one end of the second sealing ring assembly, and the other end of the first sealing ring assembly is detachably connected to the other end of the second sealing ring assembly.

[0034] Specifically, the first sealing ring assembly and the second sealing ring assembly are fixed together by a positioning pin 6, a second bolt and a second bolt hole 1 that cooperate with each other, so as to facilitate installation of the sealing ring 10 on the piston rod 9 or removal of the sealing ring 10 from the piston rod 9.

[0035] Second, as Figure 3 As shown, a hydraulic cylinder sealing system of a medium-speed coal mill comprises a hydraulic cylinder, wherein the hydraulic cylinder comprises a cylinder body, an end cover 11 and a piston rod 9, wherein the cylinder body is a cylindrical structure with an axis perpendicular to a horizontal plane, an open upper end and a closed lower end, the end cover 11 is detachably covered on the opening at the upper end of the cylinder body, the end cover 11 is provided with a mounting hole with an axis perpendicular to the horizontal plane, the piston rod 9 is coaxially mounted in the mounting hole, and further comprises a hydraulic cylinder sealing fixture of a medium-speed coal mill as described in any one of the first aspects, wherein a sealing ring 10 in the hydraulic cylinder sealing fixture of the medium-speed coal mill is sleeved on the outside of the piston rod 9 of the hydraulic cylinder, the inner side wall of the sealing ring 10 in the hydraulic cylinder sealing fixture of the medium-speed coal mill is in contact with the side wall of the piston rod 9 of the hydraulic cylinder, and the bottom surface of the sealing ring 10 in the hydraulic cylinder sealing fixture of the medium-speed coal mill is in contact with the top surface of the end cover 11 of the hydraulic cylinder.

[0036] 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 aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A hydraulic cylinder sealing tool for a medium-speed coal mill, characterized in that: It comprises a sealing ring (10) whose axis is perpendicular to the horizontal plane and can be sleeved on the outside of the piston rod (9) of the hydraulic cylinder, the inner side wall of the sealing ring (10) is in contact with the side wall of the piston rod (9) of the hydraulic cylinder, and the bottom surface of the sealing ring (10) is in contact with the top surface of the end cover (11) of the hydraulic cylinder; A temporary oil storage cavity (7) with an annular structure is provided on the inner side wall of the sealing ring (10) along its circumferential direction, and the bottom surface of the temporary oil storage cavity (7) and the bottom surface of the sealing ring (10) are located on the same plane. An oil discharge channel (2) is provided on the sealing ring (10), and one end of the oil discharge channel (2) is connected to the temporary oil storage cavity (7), and the other end of the oil discharge channel (2) is arranged on the outer side wall of the sealing ring (10).

2. The hydraulic cylinder sealing tool for a medium-speed coal mill according to claim 1, characterized in that: A first anti-oil leakage sealing ring installation groove (4) of an annular structure is provided on the inner side wall of the sealing ring (10) along its circumferential direction. The first anti-oil leakage sealing ring installation groove (4) is located above the temporary oil storage chamber (7). The first anti-oil leakage sealing ring installation groove (4) is filled with a first anti-oil leakage sealing ring that fits the side wall of the piston rod (9) of the hydraulic cylinder.

3. The hydraulic cylinder sealing tool for a medium-speed coal mill according to claim 1, characterized in that: A second anti-oil leakage sealing ring installation groove (8) with an annular structure is provided on the bottom surface of the sealing ring (10); the second anti-oil leakage sealing ring installation groove (8) surrounds the periphery of the temporary oil storage chamber (7); and the second anti-oil leakage sealing ring installation groove (8) is filled with a second anti-oil leakage sealing ring that fits the top surface of the end cover (11) of the hydraulic cylinder.

4. The hydraulic cylinder sealing tool for a medium-speed coal mill according to claim 2, characterized in that: A dustproof sealing ring installation groove (3) of an annular structure is provided on the inner side wall of the sealing ring (10) along its circumferential direction. The dustproof sealing ring installation groove (3) is located above the first anti-oil leakage sealing ring installation groove (4). The dustproof sealing ring installation groove (3) is filled with a dustproof sealing ring that fits the side wall of the piston rod (9) of the hydraulic cylinder.

5. The hydraulic cylinder sealing tool for a medium-speed coal mill according to claim 1, characterized in that: The sealing ring (10) is composed of a first sealing ring component and a second sealing ring component, wherein the first sealing ring component and the second sealing ring component are both semi-annular structures; One end of the first sealing ring assembly is detachably connected to one end of the second sealing ring assembly, and the other end of the first sealing ring assembly is detachably connected to the other end of the second sealing ring assembly.

6. A hydraulic cylinder sealing system for a medium-speed coal mill, comprising a hydraulic cylinder, the hydraulic cylinder comprising a cylinder body, an end cover (11) and a piston rod (9), the cylinder body being a cylindrical structure with an axis perpendicular to a horizontal plane, an open upper end and a closed lower end, the end cover (11) being detachably covered at the opening at the upper end of the cylinder body, the end cover (11) being provided with a mounting hole with an axis perpendicular to a horizontal plane, the piston rod (9) being coaxially mounted in the mounting hole, characterized in that: It also includes the hydraulic cylinder sealing fixture of the medium-speed coal mill as described in any one of claims 1 to 5, wherein the sealing ring (10) in the hydraulic cylinder sealing fixture of the medium-speed coal mill is sleeved outside the piston rod (9) of the hydraulic cylinder, the inner side wall of the sealing ring (10) in the hydraulic cylinder sealing fixture of the medium-speed coal mill is in contact with the side wall of the piston rod (9) of the hydraulic cylinder, and the bottom surface of the sealing ring (10) in the hydraulic cylinder sealing fixture of the medium-speed coal mill is in contact with the top surface of the end cover (11) of the hydraulic cylinder.

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