A sandblast spray guard

Abstract

This utility model belongs to the field of surface treatment technology and discloses a sandblasting and spraying protection device, including a main body and a first sealing element. The main body can be inserted into the cylinder port of a hydraulic cylinder. A limiting groove is formed in the cylinder port. A positioning part is circumferentially protruding on the upper end of the main body for engaging with the limiting groove. The first sealing element is circumferentially disposed on the main body and can seal against the inner wall of the cylinder port to prevent foreign objects such as sand or paint from entering the cylinder. A ventilation channel is formed inside the main body, and the opening of the ventilation channel is located on the top surface of the main body. A first air jet hole is formed circumferentially on the main body and communicates with the ventilation channel. The first air jet hole is located between the first sealing element and the positioning part and can blow foreign objects out of the cylinder. The sandblasting and spraying protection device can effectively prevent foreign objects such as sand and paint from entering the cylinder and avoid interfering with the sandblasting and spraying operation at the upper end of the hydraulic cylinder, thus ensuring the overall quality and performance of the hydraulic cylinder.

Description

Technical Field

[0001] This utility model relates to the field of surface treatment technology, and in particular to a sandblasting and spraying protective device. Background Technology

[0002] In the manufacturing process of hydraulic cylinders, sandblasting and spraying are key steps to improve their surface performance and extend their service life. Sandblasting removes surface impurities and increases roughness to improve coating adhesion, while spraying imparts corrosion resistance, friction reduction, and wear resistance to the cylinder. However, during actual sandblasting and spraying operations, sand and paint fragments can easily enter the cylinder body through the gaps at the top of the cylinder opening, and steel grit can easily accumulate at the internal threads of the cylinder opening. This not only makes cleaning difficult but can also lead to the entry of the fluid pipe or connector seat. Due to their concealed nature, workers often fail to notice these issues, posing significant hidden dangers to the quality and safety of the hydraulic cylinder.

[0003] Currently, to prevent sand or paint fragments from entering the cylinder body, existing sandblasting protection devices are designed to tightly cover the outer wall of the cylinder inlet. While this method can block sand fragments to some extent, it completely obstructs the upper part of the cylinder, resulting in the absence of sandblasting treatment on the upper part. Consequently, the sprayed coating cannot form a firm bond with the upper surface of the cylinder, significantly affecting the surface performance optimization of the hydraulic cylinder, disrupting the integrity and consistency of the entire sandblasting process, and seriously impacting the overall quality and performance of the hydraulic cylinder.

[0004] Therefore, there is an urgent need to develop a sandblasting and spraying protective device to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a sandblasting and spraying protection device that can effectively prevent foreign objects such as sand and paint from entering the cylinder body and avoid interfering with the sandblasting and spraying operation at the top of the cylinder, thereby ensuring the overall quality and performance of the hydraulic cylinder.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A sandblasting and spraying protective device includes a main body and a first sealing element. The main body can be inserted into the cylinder port of a hydraulic cylinder. A limiting groove is formed in the cylinder port. A positioning part is circumferentially protruding on the upper end of the main body for engaging with the limiting groove. The first sealing element is circumferentially disposed on the circumferential surface of the main body and can seal against the inner wall of the cylinder port. A ventilation channel is formed inside the main body, and the opening of the ventilation channel is located on the top surface of the main body. A first air jet hole is formed circumferentially on the main body and communicates with the ventilation channel. The first air jet hole is located between the first sealing element and the positioning part.

[0008] In some optional embodiments, the sandblasting and spraying protection device further includes a second seal, which is circumferentially disposed on the main body and located on the side of the first seal away from the positioning portion.

[0009] In some optional embodiments, the second seal and the first seal are spaced apart along the axial direction of the main body, and the circumferential surface of the main body is also provided with a second jet hole communicating with the ventilation channel, the second jet hole being located between the first seal and the second seal.

[0010] In some optional embodiments, the main body is provided with at least two first jet holes spaced evenly around its circumference; and / or, the main body is provided with at least two second jet holes spaced evenly around its circumference.

[0011] In some optional embodiments, the ratio of the cross-sectional area of ​​the first jet orifice to that of the ventilation channel is not greater than 0.5; and / or,

[0012] The ratio of the cross-sectional area of ​​the second jet orifice to that of the ventilation channel is not greater than 0.5.

[0013] In some alternative embodiments, the ventilation channel extends axially along the body, and the first jet orifice and the second jet orifice extend radially along the body, respectively.

[0014] In some alternative embodiments, the circumferential surface of the body is machined with a first sealing ring groove for receiving the first seal; and / or,

[0015] The main body has a second sealing ring groove machined on its circumferential surface to accommodate the second sealing element.

[0016] In some alternative embodiments, both the first seal and the second seal are resilient sealing rings.

[0017] In some alternative embodiments, the lower end of the body is chamfered.

[0018] In some alternative embodiments, the top surface of the body is provided with a pull ring.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a sandblasting and spraying protection device, including a main body and a first sealing element. The main body can be inserted into the cylinder port of a hydraulic cylinder. A positioning part is circumferentially protruding from the upper end of the main body for engaging with a limiting groove to position the main body along the axial direction of the cylinder port. When the positioning part is engaged with the limiting groove, it fits against the bottom wall of the limiting groove, preventing foreign objects such as sand or paint from entering the cylinder body. The first sealing element is circumferentially disposed on the main body and can seal against the inner wall of the cylinder port, further improving the sealing performance between the sandblasting and spraying protection device and the cylinder body. A ventilation channel is provided inside the main body, with the opening of the ventilation channel located on the top surface of the main body. A first air jet hole communicating with the ventilation channel is provided circumferentially on the main body and is located between the first sealing element and the positioning part. After sandblasting or spraying is completed, gas is injected into the main body through the ventilation channel, and the gas is ejected from the first air jet hole, which can blow foreign objects out of the cylinder body. The sandblasting and spraying protection device can effectively prevent foreign objects such as sand and paint from entering the cylinder body, and can also avoid interfering with the sandblasting and spraying operation at the top of the cylinder. It can ensure the overall quality and performance of the hydraulic cylinder, improve cleaning efficiency, reduce manual labor intensity, and help improve production efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the sandblasting and spraying protection device of this utility model;

[0022] Figure 2 This is a bottom view of the sandblasting and spraying protective device of this utility model;

[0023] Figure 3 yes Figure 2 Sectional view at point AA.

[0024] In the picture:

[0025] 1. Main body; 11. Positioning part; 12. Ventilation channel; 13. First air jet hole; 14. Second air jet hole; 15. First sealing ring groove; 16. Second sealing ring groove; 2. First sealing element; 3. Second sealing element. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] like Figures 1-3 As shown, this embodiment provides a sandblasting and spraying protection device that can seal the cylinder opening of a hydraulic cylinder to prevent foreign objects from entering.

[0031] It should be noted that a limit groove is provided inside the cylinder port for installing piston limiting components to limit the piston's stroke.

[0032] The sandblasting and spraying protection device of this embodiment includes a main body 1 and a first sealing member 2. The main body 1 can be inserted into the cylinder port of the hydraulic cylinder. The upper end of the main body 1 is circumferentially provided with a positioning part 11, which is used to engage with the limiting groove to position the main body 1 along the axial direction of the cylinder port. When the positioning part 11 is engaged with the limiting groove, the positioning part 11 is in contact with the bottom wall of the limiting groove, which can prevent foreign objects such as sand or paint from entering the cylinder body.

[0033] The first sealing element 2 is located on the circumference of the main body 1, and can seal with the inner wall of the cylinder port, further improving the sealing performance between the sandblasting and spraying protection device and the cylinder body.

[0034] A ventilation channel 12 is provided inside the main body 1, and the opening of the ventilation channel 12 is located on the top surface of the main body 1. A first jet hole 13 communicating with the ventilation channel 12 is provided around the main body 1. The first jet hole 13 is located between the first sealing member 2 and the positioning part 11. After sandblasting or spraying is completed, gas is injected into the main body 1 through the ventilation channel 12. The gas is ejected from the first jet hole 13, which can blow foreign objects out of the cylinder body.

[0035] It is easy to understand that, on the one hand, in some extreme cases, foreign objects enter between the positioning part 11 and the limiting groove. At this time, the foreign objects are blocked between the first sealing member 2 and the positioning part 11. Gas is ejected through the first jet hole 13. The gas acts on the positioning part 11, creating a gap between the positioning part 11 and the bottom wall of the limiting groove, so that the gas can blow the foreign objects out of the gap. On the other hand, the gas ejected through the first jet hole 13 can blow the limiting groove and the foreign objects above the limiting groove out of the cylinder body, thereby completing the cleaning of the cylinder opening and preventing foreign objects from entering the cylinder body.

[0036] The above-mentioned design can effectively prevent foreign objects such as sand and paint from entering the cylinder body, and will not interfere with the sandblasting and spraying operation at the top of the cylinder. It can ensure the overall quality and performance of the hydraulic cylinder, improve cleaning efficiency, reduce manual labor intensity, and help improve production efficiency.

[0037] In addition, the first seal 2 seals with the inner wall of the cylinder, which can fix the sandblasting protection device inside the cylinder and prevent the sandblasting protection device from falling off.

[0038] In some optional embodiments, the sandblasting and spraying protection device further includes a second seal 3, which is arranged around the periphery of the main body 1 and located on the side of the first seal 2 away from the positioning part 11. By adding the second seal 3 to the main body 1, the sealing performance and connection stability between the main body 1 and the inner wall of the cylinder can be improved, and the protection effect on the inside of the cylinder can be further enhanced.

[0039] In some optional embodiments, the second seal 3 and the first seal 2 are spaced apart along the axial direction of the main body 1, and the circumferential surface of the main body 1 is also provided with a second air jet hole 14 communicating with the ventilation channel 12. The second air jet hole 14 is located between the first seal 2 and the second seal 3.

[0040] It is easy to understand that in some extreme cases, foreign objects may pass through the positioning part 11 and the first seal 2 to reach between the first seal 2 and the second seal 3. This indicates that there is a gap between the positioning part 11 and the first seal 2 and the cylinder port. When sandblasting or spraying is completed, and gas is injected into the main body 1 through the ventilation channel 12, due to the existence of the gap, the gas can be ejected from the first jet hole 13 and the second jet hole 14 at the same time, thereby blowing the foreign objects out of the cylinder body.

[0041] In some optional embodiments, the main body 1 is provided with at least two first jet holes 13 evenly spaced around its circumference to ensure that the airflow thoroughly cleans the inner wall of the cylinder port and that the cleaning effect is uniform, which helps to reduce cleaning dead zones. Optionally, the number of first jet holes 13 includes, but is not limited to, two, three or five, and is not limited here.

[0042] In some optional embodiments, the main body 1 is provided with at least two second jet holes 14 evenly spaced around its circumference to ensure that the airflow thoroughly cleans the inner wall of the cylinder port and that the cleaning effect is uniform, which helps to reduce cleaning dead zones. Optionally, the number of second jet holes 14 includes, but is not limited to, two, three or five, and is not limited here.

[0043] In some optional embodiments, the ratio of the cross-sectional area of ​​the first jet orifice 13 to that of the ventilation channel 12 is no greater than 0.5. The larger cross-sectional area of ​​the ventilation channel 12 ensures sufficient gas flow, providing a stable gas source for subsequent gas injection. The smaller cross-sectional area of ​​the first jet orifice 13 allows for increased flow velocity and pressure due to the contraction of the flow cross-section during ejection. This results in gas being ejected from the first jet orifice 13 at higher pressure and velocity, creating strong jetting force. This effectively impacts and carries foreign objects out, achieving efficient removal of foreign objects. This ensures a continuous gas supply and optimizes jetting performance through the difference in cross-sectional area, ultimately achieving excellent foreign object ejection. Optionally, the ratio of the cross-sectional area of ​​the first jet orifice 13 to that of the ventilation channel 12 can be 0.05, 0.2, or 0.4, and is not limited thereto.

[0044] In some optional embodiments, the ratio of the cross-sectional area of ​​the second jet orifice 14 to that of the ventilation channel 12 is no greater than 0.5. The larger cross-sectional area of ​​the ventilation channel 12 ensures sufficient gas flow, providing a stable gas source for subsequent gas injection. The smaller cross-sectional area of ​​the second jet orifice 14 allows for increased velocity and pressure due to the contraction of the flow cross-section during ejection. This results in gas being ejected from the second jet orifice 14 at higher pressure and velocity, creating strong jet propulsion. This effectively impacts and carries foreign objects out, achieving efficient removal of foreign objects. This ensures a continuous gas supply and optimizes injection performance through the difference in cross-sectional area, ultimately achieving excellent foreign object ejection. Optionally, the ratio of the cross-sectional area of ​​the second jet orifice 14 to that of the ventilation channel 12 can be 0.05, 0.2, or 0.4, and is not limited thereto.

[0045] In some optional embodiments, the ventilation channel 12 extends axially along the main body 1, allowing gas to flow smoothly along the axis of the main body 1, forming an airflow transmission path consistent with the structural orientation of the main body 1. This reduces flow resistance and energy loss within the channel, ensuring stable and efficient gas delivery from the gas source to the jet nozzle. The first jet nozzle 13 and the second jet nozzle 14 extend radially along the main body 1, respectively. The design of the ventilation channel 12 extending axially along the main body 1 ensures that the ejected gas direction is perpendicular to the axis of the main body 1, forming a radial jet flow. This axial air intake and radial jet layout allows the gas to form multi-directional jet coverage within the circumference of the main body 1, facilitating all-round impact against foreign objects in different locations around the main body 1. Simultaneously, the axial and radial perpendicular structural design allows for a 90° change in gas flow direction, creating a strong velocity shift and pressure concentration effect at the jet nozzle, further enhancing the impact force of the gas jet and the efficiency of removing foreign objects. Furthermore, this layout conforms to the geometry of the main body 1, facilitating manufacturing and structural integration, resulting in a compact and rational overall structure, and improving the practicality and reliability of the device.

[0046] In some optional embodiments, the circumferential surface of the main body 1 is machined with a first sealing ring groove 15 for accommodating the first sealing element 2. The first sealing element 2 is embedded in the first sealing ring groove 15, which can play a role in positioning and limiting the first sealing element 2, preventing it from shifting or twisting during assembly or operation, ensuring the stability and consistency of the sealing structure, and providing a long-term and stable guarantee for the sealing connection between the main body 1 and external components.

[0047] In some optional embodiments, the circumferential surface of the main body 1 is machined with a second sealing ring groove 16 for accommodating the second sealing element 3. The second sealing element 3 is embedded in the first sealing ring groove 15, which can play a role in positioning and limiting the second sealing element 3, preventing it from shifting or twisting during assembly or operation, ensuring the stability and consistency of the sealing structure, and further providing a long-term and stable guarantee for the sealing connection between the main body 1 and external components.

[0048] In some optional embodiments, both the first seal 2 and the second seal 3 are elastic sealing rings. Utilizing the elastic deformation properties of their elastic materials (such as rubber, silicone, etc.), they can effectively resist gas and liquid leakage and adapt to pressure fluctuations and slight displacements under different working conditions. The elastic material has low precision requirements on the assembly surface, which can compensate for minor errors generated during processing or assembly, and improve the compatibility and reliability of the sealing structure. Moreover, the elastic sealing ring has a simple structure, low cost, and is easy to standardize production and quick assembly, which can significantly reduce manufacturing and maintenance costs.

[0049] In some optional embodiments, the lower end of the main body 1 is chamfered, which serves as a guide during assembly, reduces edge resistance, and guides the main body 1 to be smoothly inserted into the cylinder port, thereby improving assembly efficiency and reducing the risk of damage to the inner wall of the cylinder port; at the same time, it eliminates sharp edges, avoids scratching personnel or abrading surrounding parts, and enhances safety.

[0050] In some optional embodiments, the top surface of the main body 1 is provided with a pull ring, which is easy to hold or used as a lifting point. The staff can easily remove the sandblasting protective device from the cylinder opening through the pull ring, which is convenient for reuse.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sandblasting and spraying protective device, characterized in that, The device includes a main body (1) and a first sealing element (2). The main body (1) can be inserted into the cylinder port of a hydraulic cylinder. A limiting groove is provided in the cylinder port. A positioning part (11) is circumferentially protruding from the upper end of the main body (1) for engaging with the limiting groove. The first sealing element (2) is circumferentially disposed around the main body (1) and can seal against the inner wall of the cylinder port. A ventilation channel (12) is provided inside the main body (1), and the opening of the ventilation channel (12) is located on the top surface of the main body (1). A first air jet hole (13) communicating with the ventilation channel (12) is provided circumferentially on the main body (1). The first air jet hole (13) is located between the first sealing element (2) and the positioning part (11).

2. The sandblasting and spraying protective device according to claim 1, characterized in that, The sandblasting and spraying protection device also includes a second seal (3), which is arranged around the periphery of the main body (1) and located on the side of the first seal (2) away from the positioning part (11).

3. The sandblasting and spraying protective device according to claim 2, characterized in that, The second seal (3) and the first seal (2) are spaced apart along the axial direction of the main body (1). The main body (1) is also provided with a second jet hole (14) communicating with the ventilation channel (12). The second jet hole (14) is located between the first seal (2) and the second seal (3).

4. The sandblasting and spraying protective device according to claim 3, characterized in that, The main body (1) is provided with at least two first jet holes (13) evenly spaced in the circumference; and / or, the main body (1) is provided with at least two second jet holes (14) evenly spaced in the circumference.

5. The sandblasting and spraying protective device according to claim 3, characterized in that, The ratio of the cross-sectional area of ​​the first jet orifice (13) to that of the ventilation channel (12) is not greater than 0.5; and / or, The ratio of the cross-sectional area of ​​the second jet hole (14) to that of the ventilation channel (12) is not greater than 0.

5.

6. The sandblasting and spraying protective device according to claim 3, characterized in that, The ventilation channel (12) extends along the axial direction of the body (1), and the first jet hole (13) and the second jet hole (14) extend along the radial direction of the body (1), respectively.

7. The sandblasting and spraying protective device according to claim 3, characterized in that, The body (1) has a first sealing ring groove (15) machined on its circumferential surface for accommodating the first sealing element (2); and / or, The body (1) has a second sealing ring groove (16) machined on its circumferential surface for accommodating the second seal (3).

8. The sandblasting and spraying protective device according to claim 3, characterized in that, Both the first seal (2) and the second seal (3) are elastic sealing rings.

9. The sandblasting and spraying protective device according to any one of claims 1 to 8, characterized in that, The lower end of the main body (1) is chamfered.

10. The sandblasting and spraying protective device according to any one of claims 1 to 8, characterized in that, The top surface of the main body (1) is provided with a pull ring.

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