Dustproof device of variable-amplitude oil cylinder

Abstract

The utility model provides a dust-proof device of a variable-amplitude oil cylinder, which comprises a dust-proof cover which is used for being arranged close to a sliding sleeve of the variable-amplitude oil cylinder and is divided into an upper half cover and a lower half cover; the sealing ring is used for being nested on the inner side of the dust cover, the sealing ring is in contact with the surface of a piston rod of the variable-amplitude oil cylinder, and the sealing ring is divided into an upper half ring and a lower half ring; and the magnetic group consists of a plurality of magnets, is uniformly fixed on one side, facing the sliding sleeve, of the dust cover, and is used for magnetically attracting the dust cover to the sliding sleeve. The dustproof device is simple in structure and convenient to operate and install.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinder equipment, and particularly relates to a dust-proof device for a luffing cylinder. Background Art

[0002] Luffing cylinders are commonly used for adjusting the elevation angle of mechanisms in mechanical equipment. In the working and standby conditions in sandy environments, since the piston rod is located above the cylinder, dust and other particles will continuously accumulate outside the dust-proof ring of the sliding sleeve. During the retraction process of the piston rod, the accumulated dust is likely to cross the dust-proof ring and enter the interior of the cylinder, thereby accelerating the failure of the cylinder and the hydraulic system. Generally, the dust-proof function of luffing cylinders is not strengthened separately in design. If the operating environment conditions are harsh, it will lead to a shortened service life of the cylinder.

[0003] In view of this, it is urgent to design a dust-proof device for a luffing cylinder that can prevent dust from entering the interior of the cylinder and is easy to install. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a dust-proof device for a luffing cylinder.

[0005] The utility model provides a dust-proof device for a luffing cylinder, including: a dust-proof cover, which is arranged close to the sliding sleeve of the luffing cylinder and is divided into an upper half cover and a lower half cover; a sealing ring, which is nested inside the dust-proof cover, and the sealing ring contacts the surface of the piston rod of the luffing cylinder and is divided into an upper half ring and a lower half ring; a magnetic group, which is composed of multiple magnets and is uniformly fixed on the side of the dust-proof cover facing the sliding sleeve, and the magnetic group is used to magnetically attract the dust-proof cover to the sliding sleeve.

[0006] According to an embodiment of the utility model, the upper half cover is provided with an oil injection hole for injecting oil into the sealing ring.

[0007] According to an embodiment of the utility model, the lower half cover is provided with an observation hole for observing the oil lubrication condition of the sealing ring.

[0008] According to an embodiment of the utility model, the sealing ring is a felt ring oil seal, and its cross-section is L-shaped, and the flange of the sealing ring faces the side of the sliding sleeve.

[0009] According to an embodiment of the utility model, a groove is arranged inside the dust-proof cover, and both sides of the groove are divided into a first ring plate and a second ring plate. The one facing the sliding sleeve is the first ring plate, and the one away from the sliding sleeve is the second ring plate.

[0010] According to an embodiment of the utility model, the diameter of the edge of the second ring plate is larger than the outer diameter of the piston rod, and the diameter of the edge of the first ring plate is larger than the diameter of the edge of the second ring plate.

[0011] According to an embodiment of the present utility model, the height of the first ring plate relative to the bottom of the groove matches the flange of the sealing ring. The flange of the sealing ring abuts against the outer side of the first ring plate from the outer side of the first ring plate. The outer side of the flange is adsorbed to the sliding sleeve by the magnetic group and fits with the end face of the sliding sleeve. The side of the sealing ring away from its flange abuts against the inner side of the second ring plate.

[0012] According to an embodiment of the present utility model, the dust-proof device of the luffing cylinder further includes: ear seats, which are arranged at both ends of the upper half cover and the lower half cover. The upper half cover and the lower half cover are connected through the ear seats to limit the sealing ring within the dust-proof cover.

[0013] According to an embodiment of the present utility model, the dust-proof device of the luffing cylinder further includes: a dust-proof ring, which is fixed on the piston rod axially outside the sliding sleeve when the piston rod is in the retracted state through a hose clamp.

[0014] According to an embodiment of the present utility model, the dust-proof device of the luffing cylinder further includes: a dust-proof plug, which is used for installation at the port of the oil injection hole to prevent dust from entering the oil injection hole.

[0015] The dust-proof device of the luffing cylinder in this application is connected to the end of the sliding sleeve through a plurality of magnets by the dust-proof cover, avoiding on-site mechanical processing of the protective sleeve. Moreover, both the sealing ring and the dust-proof cover adopt a semi-sectional snap-fit structure. Cleaning and replacing the sealing ring do not require disassembling the piston rod connection part. This dust-proof device has a simple structure and convenient operation, and is easy to install.

[0016] It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and they cannot limit the scope claimed by the present utility model. Description of the Drawings

[0017] The following drawings are part of the specification of the present utility model, which illustrate the exemplary embodiments of the present utility model. The attached drawings, together with the description of the specification, are used to explain the principle of the utility model.

[0018] Figure 1 is a cross-sectional view of the dust-proof device of the luffing cylinder according to an embodiment of the present utility model;

[0019] Figure 2 is a cross-sectional view of the dust-proof device of the luffing cylinder according to another embodiment of the present utility model;

[0020] Figure 3 is an exploded view of the dust-proof device of the luffing cylinder according to an embodiment of the present utility model;

[0021] Figure 4 is a schematic diagram of the dust-proof cover in the dust-proof device of the luffing cylinder according to an embodiment of the present utility model.

[0022] Reference Numerals:

[0023] 100 - dust cover, 101 - upper half cover, 102 - lower half cover, 103 - oil injection hole, 104 - observation hole, 105 - first ring plate, 106 - second ring plate, 107 - ear seat, 108 - dust plug, 200 - seal, 201 - upper half circle, 202 - lower half circle, 300 - magnetic group, 400 - dust ring, 401 - hose clamp. Detailed Embodiment

[0024] The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. To make the objectives, technical solutions, and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present utility model and are used to exemplarily illustrate the principles of the present utility model, and are not configured to limit the present utility model. Additionally, the components in the drawings are not necessarily drawn to scale. For example, the dimensions of some components or regions in the drawings may be enlarged for other components or regions to assist in understanding the embodiments of the present utility model.

[0025] The directional terms appearing in the following description are all the directions shown in the drawings and do not specifically limit the structure of the embodiments of the present utility model. In the description of the present utility model, it should be noted that unless otherwise specified, the terms "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In addition, the terms "including", "comprising", "having" or any other variants thereof are intended to cover non-exclusive inclusion, such that a series of elements, structures, or components includes not only those elements but also other structures or components that are not explicitly listed or are inherent to the structures or components. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the articles or devices including the elements.

[0027] Spatial relationship terms such as "below", "beneath", "under", "lower", "above", "on", "higher", etc. are used for convenience of description to explain the positioning of one element relative to a second element, and these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. Additionally, for example, "one element is on / under another element" can mean that the two elements are in direct contact or that there are other elements between the two elements. Furthermore, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and should not be construed as limiting. Similar terms denote similar elements throughout the description.

[0028] For those skilled in the art, the present utility model can be implemented without some of these specific details. The following description of the embodiments is merely provided to provide a better understanding of the present utility model by showing examples of the present utility model.

[0029] Figure 1 is a cross-sectional view of a dust-proof device for a boom cylinder according to an embodiment of the present utility model; Figure 2 is a cross-sectional view of a dust-proof device for a boom cylinder according to another embodiment of the present utility model; Figure 3 is an exploded view of a dust-proof device for a boom cylinder according to an embodiment of the present utility model; Figure 4 is a schematic view of a dust-proof cover in a dust-proof device for a boom cylinder according to an embodiment of the present utility model.

[0030] As Figure 1 shown, the present utility model provides a dust-proof device for a boom cylinder, including: a dust-proof cover 100, which is arranged close to the sliding sleeve T of the boom cylinder and is divided into an upper half cover 101 and a lower half cover 102; a sealing ring 200, which is nested inside the dust-proof cover 100, and the sealing ring 200 is in contact with the surface of the piston rod G of the boom cylinder and is divided into an upper half ring 201 and a lower half ring 202; a magnetic group 300, which is composed of a plurality of magnets and is uniformly fixed on one side of the dust-proof cover 100 facing the sliding sleeve T, and the magnetic group 300 is used to magnetically attract the dust-proof cover 100 to the sliding sleeve T.

[0031] Specifically, the boom cylinder is a mechanical transmission mechanism mainly used to control and adjust the amplitude variation of the hydraulic stroke in a hydraulic system, wherein the piston rod G performs telescopic adjustment inside the cylindrical sliding sleeve T. The dust-proof device for the boom cylinder of the present application can be installed on-site after the boom cylinder is delivered from the factory, thereby improving the service life of the boom cylinder.

[0032] Among them, the dust cover 100 of the dust-proof device is connected to the end of the luffing cylinder sliding sleeve T by multiple magnets, avoiding on-site machining of the protective sleeve. Both the sealing ring 200 and the dust cover 100 adopt a semi-sectional snap-fit structure. Cleaning and replacing the sealing ring 200 do not require disassembling the connecting part of the piston rod G. The device has a simple structure and is convenient to operate. In one embodiment, the magnet can be a strong neodymium iron boron cylindrical magnet. The dust cover 100 is provided with positioning holes for uniformly distributing magnetic groups 300 on the circumference near the sliding sleeve T. The magnet can be bonded in the positioning holes at the corresponding positions of the dust cover 100 through a two-component structural adhesive, and the magnetic poles can be matched to have the same orientation during installation.

[0033] As Figure 3 shown, according to an embodiment of the present invention, the upper half cover 101 is provided with an oil injection hole 103 for injecting oil into the sealing ring 200.

[0034] According to an embodiment of the present invention, the lower half cover 102 is provided with an observation hole 104 for observing the oil lubrication condition of the sealing ring 200.

[0035] According to an embodiment of the present invention, the sealing ring 200 is a felt ring oil seal, and its cross-section is L-shaped. The flange of the sealing ring 200 faces the sliding sleeve T side.

[0036] As Figure 4 shown, according to an embodiment of the present invention, the inner side of the dust cover 100 is provided with a groove. The two sides of the groove are respectively the first ring plate 105 and the second ring plate 106. The side facing the sliding sleeve T is the first ring plate 105, and the side away from the sliding sleeve T is the second ring plate 106.

[0037] According to an embodiment of the present invention, the diameter of the edge of the second ring plate 106 is larger than the outer diameter of the piston rod G, and the diameter of the edge of the first ring plate 105 is larger than the diameter of the edge of the second ring plate 106.

[0038] According to an embodiment of the present invention, the height of the first ring plate 105 relative to the bottom of the groove is matched with the flange of the sealing ring 200. The flange of the sealing ring 200 abuts against the outer side of the first ring plate 105 from the outer side of the first ring plate 105, and the outer side of the flange is adsorbed to the sliding sleeve T through the magnetic group 300 and fits with the end face of the sliding sleeve T. The side of the sealing ring 200 away from its flange abuts against the inner side of the second ring plate 106.

[0039] According to an embodiment of the present invention, the dust-proof device of the luffing cylinder further includes: an ear seat 107, which is arranged at both ends of the upper half cover 101 and the lower half cover 102. The upper half cover 101 and the lower half cover 102 are connected through the ear seat 107 to limit the sealing ring 200 within the dust cover 100.

[0040] As Figure 2 and Figure 3As shown, according to an embodiment of the present utility model, the dust-proof device of the luffing oil cylinder further includes: a dust-proof ring 400, which is fixed on the piston rod G through a hose clamp 401, and the dust-proof ring 400 is arranged axially outside the sliding sleeve T when the piston rod G is in the retracted state.

[0041] According to an embodiment of the present utility model, the dust-proof device of the luffing oil cylinder further includes: a dust-proof plug 108, which is used to be installed at the port of the oil injection hole 103 to prevent dust from entering the oil injection hole 103.

[0042] Specifically, the dust-proof cover 100 can be made of carbon structural steel material and is composed of two half covers, namely an upper half cover 101 and a lower half cover 102. Both the upper half cover 101 and the lower half cover 102 are provided with grooves for installing the sealing ring 200. The two sides in the width direction of the groove are respectively a first ring plate 105 and a second ring plate 106. The side facing the sliding sleeve T is the first ring plate 105, and the side away from the sliding sleeve T is the second ring plate 106. The diameter (inner diameter) of the second ring plate 106 is larger than the outer diameter of the piston rod G, and the diameter (inner diameter) of the first ring plate 105 is larger than the diameter of the second ring plate 106. The diameters of the first ring plate 105 and the second ring plate 106 being larger than the outer diameter of the piston rod G is to ensure that the two half covers can be buckled and installed with each other. The diameter of the first ring plate 105 being larger than the diameter of the second ring plate 106 is mainly to confine the sealing ring 200 inside, improving the oil seal effect on the luffing oil cylinder.

[0043] It should be noted that the sealing ring 200 is a felt oil seal, which can be made of semi-coarse wool felt and is composed of an upper half ring 201 and a lower half ring 202. For example, the cross-section of the sealing ring 200 is L-shaped, and the flange faces the side of the sliding sleeve T. After installation, the height of the flange of the sealing ring 200 in the radial direction is greater than the height of the radial protrusion of the magnetic group 300. For example, the height of the first ring plate 105 matches the flange structure of the sealing ring 200, where the flange of the sealing ring 200 abuts against the outer side of the first ring plate 105 from the outside of the first ring plate 105, and the outer side of the flange is adsorbed to the sliding sleeve T through the magnetic group 300 and fits with the end face of the sliding sleeve T. The side of the sealing ring 200 away from its flange abuts against the inner side of the second ring plate 106. The sealing ring 200 of the present application can further improve the oil seal effect by setting a flange structure and abutting against the sliding sleeve T, the first ring plate 105 and the second ring plate 106 in a matching manner.

[0044] In one embodiment, an oil injection hole 103 is provided at the top of the upper half cover 101 for oil injection maintenance of the sealing ring 200 so that the sealing ring 200 remains in an oiled state; ear seats 107 for connecting with the lower half cover 102 are also provided on both sides of the upper half cover 101. An observation hole 104 is provided at the bottom of the lower half cover 102 for observing the oiled condition of the felt ring oil seal; ear seats 107 for connecting with the upper half cover 101 are also provided on both sides of the lower half cover 102. The ear seats 107 can be connected by fasteners so that the upper half cover 101 and the lower half cover 102 are connected to each other, and the sealing ring 200 is restricted within the dust cover 100. A dust plug 108 is installed at the mouth of the oil injection hole 103 of the upper half cover 101 to prevent dust from entering the oil injection hole 103.

[0045] In specific operation, when the dust cover 100 is engaged with the sliding sleeve T, the sealing ring 200 is subjected to a certain compressive force, so that an annular sealing structure is formed between the sliding sleeve T and the dust cover 100. In addition, the sealing ring 200 can be in close contact with the piston rod G under the pressing of the dust cover 100, and can remove the dust adhered to the outer surface of the piston rod G during the process of the piston rod G retracting into the oil cylinder, and form a relatively dense oil film on the surface of the piston rod G.

[0046] Among them, the dust ring 400 can be made by cutting an L-1100 type polyethylene closed-cell foam board and is fastened at a set position of the piston rod G by a hose clamp 401. For example, when the dust ring is arranged at this position, when the piston rod G is retracted in place, the dust ring 400 can contact the outer ring surface of the dust cover 100 and establish a certain compression amount, so as to prevent dust from accumulating on the surface of the felt ring oil seal during the parking period of the piston rod G in the retracted state. The dust ring 400 can ensure further protection of the felt ring oil seal in the retracted state of the piston rod G and extend the replacement cycle of the felt ring oil seal. For example, the hose clamp 401 is driven by a stainless steel screw rod to fix the dust ring 400 at a set position of the piston rod G.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dust prevention device for a variable amplitude oil cylinder, characterized in that: include: The dust cover is used for the sliding sleeve near the luffing cylinder and is divided into an upper cover and a lower cover; A sealing ring, which is used to be nested inside the dust cover, the sealing ring contacts the piston rod surface of the luffing oil cylinder and is divided into an upper half circle and a lower half circle; The magnetic group is composed of a plurality of magnets and is evenly fixed on the side of the dust cover facing the sliding sleeve. The magnetic group is used to magnetically attract the dust cover to the sliding sleeve.

2. The dust prevention device for the luffing cylinder according to claim 1, characterized in that: The upper half cover is provided with an oil filling hole for filling oil into the sealing ring.

3. The dust prevention device for the luffing cylinder according to claim 1, characterized in that: The lower half cover is provided with an observation hole for observing the oiliness of the sealing ring.

4. The dust prevention device for the luffing cylinder according to claim 1, characterized in that: The sealing ring is a felt ring oil seal, the cross section of which is L-shaped, and the flange of the sealing ring faces one side of the sliding sleeve.

5. The dust prevention device for the luffing cylinder according to claim 4, characterized in that: A groove is arranged on the inner side of the dust cover, and two sides of the groove are divided into a first ring plate and a second ring plate. The first ring plate is on the side facing the sliding sleeve, and the second ring plate is on the side away from the sliding sleeve.

6. The dust prevention device for the luffing cylinder according to claim 5, characterized in that: The edge diameter of the second ring plate is larger than the outer diameter of the piston rod, and the edge diameter of the first ring plate is larger than the edge diameter of the second ring plate.

7. The dust prevention device for the luffing cylinder according to claim 5, characterized in that: The height of the first ring plate relative to the bottom of the groove matches the flange of the sealing ring, the flange of the sealing ring abuts against the outer side of the first ring plate from the outer side of the first ring plate, the outer side of the flange is adsorbed to the sliding sleeve through the magnetic group and fits with the end face of the sliding sleeve, and the sealing ring abuts against the inner side of the second ring plate away from its flange side.

8. The dust prevention device for the luffing cylinder according to claim 1, characterized in that: Also includes: Ear seats are arranged at both ends of the upper half cover and the lower half cover, and the upper half cover and the lower half cover are connected by the ear seats to restrict the sealing ring in the dust cover.

9. The dust prevention device for the luffing cylinder according to claim 1, characterized in that: Also includes: The dust ring is fixed on the piston rod axially outside the sliding sleeve when the piston rod is in the retracted state through a throat clamp.

10. The dust prevention device for the luffing cylinder according to claim 2, characterized in that: Also includes: A dust plug is installed at the oil filling hole to prevent sand and dust from entering the oil filling hole.

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