Used for shielding workpieces on the inner wall of shaft holes

Abstract

The present invention discloses a shielding workpiece for the inner wall of a shaft hole. The shielding workpiece for the inner wall of the shaft hole includes an elastic shielding plate. The elastic shielding plate is rolled from a straight shape into a cylindrical shape and is used to be placed in the shaft hole so as to elastically fit on the inner wall of the shaft hole through radial elastic force. That is, before the shaft hole needs to be painted, the elastic shielding plate can be rolled from a straight shape into a cylindrical shape and then placed in the shaft hole. Since the elastic shielding plate is elastic, it can tightly fit with the inner wall of the shaft hole through the radial elastic force formed by elastic deformation, so that the shaft hole can be shielded and protected in a way that replaces manual grease application during painting, thereby achieving the purpose of improving the processing efficiency of the pump truck arm.

Description

Technical Field

[0001] The invention belongs to the technical field of coating processing, and in particular relates to a shielding workpiece used for the inner wall of a shaft hole. Background Art

[0002] like Figure 1 As shown, when painting the pump truck boom, in order to prevent paint from adhering to the wall of the finely machined shaft hole 5, a layer of lithium-based grease 6 is generally applied to the wall of the shaft hole 5 before painting. However, the movement of each arm section of the pump truck boom needs to rely on a four-bar mechanism driven by an oil cylinder. Based on the six-section boom structure commonly found in the market, there are as many as 168 finely machined shaft holes 5. In addition, the lithium-based grease 6 must completely cover the wall of the shaft hole 5 and cannot drip onto other surfaces of the part or exceed the wall of the shaft hole 5. Therefore, using manual grease to shield and protect the shaft hole 5 will result in low processing efficiency of the pump truck boom. Summary of the Invention

[0003] In response to the above-mentioned defects or shortcomings of the prior art, the present invention provides a shielding workpiece for the inner wall of the shaft hole, which can replace the manual greasing method to shield and protect the shaft hole during painting processing, thereby achieving the purpose of improving the processing efficiency of the pump truck boom.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a shielding workpiece for the inner wall of the shaft hole, wherein the shielding workpiece for the inner wall of the shaft hole includes an elastic shielding plate, which is wound from a straight shape into a cylindrical shape and is used to be placed in the shaft hole to elastically fit on the inner wall of the shaft hole through radial elastic force.

[0005] In an embodiment of the present invention, the length of the elastic shielding plate is set to be greater than the circumference of the shaft hole. The elastic shielding plate is wound along the length direction and forms an outer ring elastically fitting with the inner wall of the shaft hole and an inner ring elastically fitting with the outer ring.

[0006] In an embodiment of the present invention, the free end of the elastic shielding plate curled to form the outer ring is chamfered toward the inner wall of the shaft hole so that the chamfered surface is fitted with the inner ring.

[0007] In the embodiment of the present invention, the angle between the chamfered surface and the side surface of the elastic shielding plate used for contacting with the inner wall of the shaft hole is 15° to 45°.

[0008] In an embodiment of the present invention, the elastic shielding plate includes a main body and a handle extending outward from one side of the main body. The main body is rolled into a cylindrical shape from a straight shape and is used to be placed in the shaft hole to form an outer ring and an inner ring and allow the handle to extend out of the shaft hole.

[0009] In the embodiment of the present invention, a hand-held opening is further provided on the main body, and the hand-held opening and the hand-held portion are provided at both ends of the main body, and the hand-held opening is used to be located on the outer ring when the main body is wound.

[0010] In the embodiment of the present invention, the main body is square, and a notch corresponding to the handle is formed on a side of the main body away from the handle.

[0011] In an embodiment of the present invention, the width of the main body is set to be greater than or equal to the depth of the shaft hole.

[0012] In the embodiment of the present invention, the material of the elastic shielding plate is at least one of polypropylene, polysulfone and acrylonitrile-butadiene-styrene plastic.

[0013] In the embodiment of the present invention, the thickness of the elastic shielding plate is 0.2 mm to 2.0 mm.

[0014] Through the above technical solution, the shielding workpiece for the inner wall of the shaft hole provided by the embodiment of the present invention has the following beneficial effects:

[0015] The shielding workpiece used for the inner wall of the shaft hole includes an elastic shielding plate, which is rolled from a straight shape into a cylindrical shape and is used to be placed in the shaft hole so as to elastically fit on the inner wall of the shaft hole through radial elastic force. Before the shaft hole needs to be painted, the elastic shielding plate can be rolled from a straight shape into a cylindrical shape and then placed in the shaft hole. Since the elastic shielding plate is elastic, it can fit tightly with the inner wall of the shaft hole through the radial elastic force formed by elastic deformation, so that the shaft hole can be shielded and protected in a way that replaces manual grease application during painting, thereby achieving the purpose of improving the processing efficiency of the pump truck boom.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure in which the shaft hole is shielded and protected by artificial grease application;

[0019] Figure 2 is a schematic structural diagram of a wound arrangement of an elastic shielding plate according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of an elastic shielding plate according to an embodiment of the present invention from one perspective;

[0021] Figure 4FIG. 1 is a schematic structural diagram of an elastic shielding plate according to an embodiment of the present invention from another perspective.

[0022] Description of Reference Numerals

[0023] 1 elastic shielding plate 11 main body

[0024] 111 outer ring 112 inner ring

[0025] 12 Handle 2 chamfer

[0026] 3 Handle port 4 Notch

[0027] 5 Shaft hole 6 Lithium grease DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0029] like Figure 1 As shown, when painting the pump truck boom, in order to prevent paint from adhering to the wall of the finely machined shaft hole 5, a layer of lithium-based grease 6 is generally applied to the wall of the shaft hole 5 before painting. However, the movement of each arm section of the pump truck boom needs to rely on a four-bar mechanism driven by an oil cylinder. Based on the six-section boom structure commonly found in the market, there are as many as 168 finely machined shaft holes 5. In addition, the lithium-based grease 6 must completely cover the wall of the shaft hole 5 and cannot drip onto other surfaces of the part or exceed the wall of the shaft hole 5. Therefore, using manual grease to shield and protect the shaft hole 5 will result in low processing efficiency of the pump truck boom.

[0030] Currently, the painting process for pump truck boom parts after finishing includes the following steps: sandblasting, shaft hole grease application, paint spraying, and baking. To ensure production line efficiency and rapid paint curing, the baking process typically brings the part surface temperature to 90-110°C.

[0031] The steps of the shaft hole grease coating process are as follows:

[0032] 1. After the sandblasting process, use a brush to evenly apply lithium-based grease 6 on the wall surface of the finished shaft hole 5 of the part, and make sure that the wall surface is completely covered and the lithium-based grease 5 cannot drip onto other surfaces of the part or exceed the finished shaft hole surface.

[0033] 2. When the parts are off the line, you can use a scraper to remove the lithium-based grease 6. Make sure that the lithium-based grease 6 does not contaminate the painted surface.

[0034] Therefore, in order to ensure the coating quality of the lithium-based grease 6 and the processing quality of the paint surface, the coating efficiency and the scraping efficiency of the lithium-based grease will be affected.

[0035] At the same time, the shielding and protection of the shaft hole 5 by manual grease application has the following disadvantages:

[0036] 1. Due to the high baking temperature used in the baking process, the finely machined shaft hole 5 needs to be shielded with high-temperature resistant lithium-based grease 6. At the same time, the lithium-based grease 6 stained with paint cannot be reused. Therefore, the cost of manual grease application is high and not environmentally friendly.

[0037] 2. In order to prevent the lithium-based grease 6 from contaminating other parts of the parts and steel shots, the shaft hole grease coating process is generally carried out after the sandblasting process. However, the shielding protection of the shaft hole 5 cannot cover the sandblasting process, causing the sandblasting to cause the roughness of the wall surface of the fine-machined shaft hole 5 to change, affecting the accuracy of the shaft hole 5.

[0038] A shielding workpiece for an inner wall of a shaft hole according to the present invention will be described below with reference to the accompanying drawings.

[0039] like Figure 1 and Figure 2 As shown, in the present invention, a shielding workpiece for the inner wall of the shaft hole is provided, wherein the shielding workpiece for the inner wall of the shaft hole includes an elastic shielding plate 1, which is wound from a straight shape into a cylindrical shape and is used to be placed in the shaft hole 5 so as to elastically fit on the inner wall of the shaft hole 5 through radial elastic force.

[0040] After using the above-mentioned shielding workpiece, before the shaft hole 5 needs to be painted, the elastic shielding plate 1 can be rolled from a straight shape into a cylindrical shape and then placed in the shaft hole 5. Since the elastic shielding plate 1 is elastic, it can fit tightly with the inner wall of the shaft hole 5 through the radial elastic force formed by elastic deformation, so that the shaft hole 5 can be shielded and protected in a way that replaces manual grease application during the painting process, thereby achieving the purpose of improving the processing efficiency of the pump truck boom.

[0041] In this embodiment of the present invention, the length of the elastic shielding plate 1 is configured to be greater than the circumference of the axial hole 5. The elastic shielding plate 1 is wound along its length and forms an outer ring 111 that elastically contacts the inner wall of the axial hole 5, and an inner ring 112 that elastically contacts the outer ring 111. That is, the number of turns of the elastic shielding plate 1 wound within the axial hole 5 can be greater than one, and is not limited to an integer number of turns. For example, it can be 1.5 turns, 2 turns, 2.5 turns, or 3 turns, as long as the inner ring 112 can firmly abut the outer ring 111 against the inner wall of the axial hole 5. Furthermore, in the present invention, the outer ring 111 of the elastic shielding plate 1 is the first turn, counting from the outside inward. That is, the outer ring 111 generally refers to the turn that contacts the inner wall of the axial hole 5, while the inner ring 112 refers to all turns, counting from the outside inward, except the first turn. The inner ring 112 can be less than one turn or multiple turns.

[0042] Specifically, the length of the elastic shielding plate 1 can be determined based on the circumference of the largest shaft hole on the pump truck boom, so that the elastic shielding plate 1 can be applied to all shaft holes 5 on the pump truck boom, thereby improving the versatility of the elastic shielding plate 1. For shaft holes 5 of different circumferences, the elastic shielding plate 1 can be wound with different numbers of turns. For shaft holes 5 with larger circumferences, the elastic shielding plate 1 needs to be wound with fewer turns, while for shaft holes 5 with smaller circumferences, the elastic shielding plate 1 needs to be wound with more turns.

[0043] See also Figure 2 and Figure 4 In this embodiment of the present invention, the free end of the curled outer ring 111 of the elastic shielding plate 1 is provided with a chamfer 2 on the side facing away from the inner wall of the shaft hole 5, so that the chamfered surface of the chamfer 2 is aligned with the inner ring 112. When the outer ring 111 of the elastic shielding plate 1 is aligned with the inner wall of the shaft hole 5, a step gap is formed between the free end of the outer ring 111 and the inner wall of the shaft hole 5. By providing the chamfer 2 on the free end of the outer ring 111, with the chamfered surface of the chamfer 2 facing the inner ring 112, this step gap can be reduced, thereby improving the shielding effect of the elastic shielding plate 1 on the shaft hole 5. It should be noted that when the thickness of the elastic shielding plate 1 is less than 1 mm, the chamfer 2 does not need to be provided. Furthermore, the chamfer 2 can be formed throughout the entire thickness of the elastic shielding plate 1 or only partially. For example, when the thickness of the elastic shielding plate 1 is 1.5 mm, the chamfer 2 can have a thickness of 1.5 mm or 1 mm along the thickness direction.

[0044] In this embodiment of the present invention, the angle between the chamfered surface and the side surface of the elastic shielding plate 1 that contacts the inner wall of the shaft hole 5 can be 15° to 45°. Specifically, the angle can be preferably 30°. That is, the angle between the chamfered surface and the side surface of the elastic shielding plate 1 that contacts the inner wall of the shaft hole 4 can be set to a smaller acute angle, thereby allowing the chamfered surface to better contact the inner ring 112 and further reducing the step gap between the free end of the outer ring 111 and the wall of the shaft hole 5.

[0045] See also Figure 2 and Figure 3 In this embodiment of the present invention, the elastic shielding plate 1 includes a main body 11 and a handle 12 extending outward from one side of the main body 11. The main body 11 is wound from a straight shape into a cylindrical shape and placed in the shaft hole 5 to form an outer ring 111 and an inner ring 112, and the handle 12 extends out of the shaft hole 5. This allows the main body 11 to be wound into a coil by hand, and also facilitates removal of the elastic shielding plate 1 from the shaft hole 5.

[0046] In this embodiment of the present invention, the main body 11 is further provided with a handle opening 3. The handle opening 3 and the handle portion 12 are located at opposite ends of the main body 11. The handle opening 3 is positioned on the outer ring 111 when the main body 11 is wound. When the handle opening 3 is positioned on the outer ring 111, the handle portion 12 is positioned on the innermost inner ring 112. Therefore, when the elastic shielding plate 1 is wound, the degree of winding of the elastic shielding plate 1 can be adjusted by grasping the handle portion 12 with one hand and pulling the main body 11 with the other hand. This allows for quick adaptation to shaft holes 5 of varying diameters. Specifically, the handle opening 3 can be shaped like a long waist.

[0047] In this embodiment of the present invention, the main body 11 is square in shape. A notch 4 is formed on the side of the main body 11 away from the handle 12, corresponding to the handle 12. Therefore, when batches of elastic shielding plates 1 are processed, the position of the notch 4 of the previous elastic shielding plate 1 can be designed to correspond to the position of the handle 12 of the next elastic shielding plate 1, thereby avoiding excess material and improving material utilization. Of course, in the present invention, both the notch 4 and the handle 12 are located within the inner ring 112, so that the presence of the notch 4 does not affect the shielding protection of the shaft hole 5.

[0048] Furthermore, the shape and size of the notch 4 can be kept the same as those of the handle 12 , that is, when the elastic shielding plates 1 are batch processed, the notch 4 of the previous elastic shielding plate 1 can be arranged to overlap with the handle 12 of the next elastic shielding plate 1 .

[0049] In an embodiment of the present invention, the width of the main body 11 is set to be greater than or equal to the depth of the shaft hole 5, thereby ensuring the shielding and protective effect of the elastic shielding plate 1. It should be noted that the width direction of the main body 11 is set perpendicular to the length direction of the elastic shielding plate 1. In addition, the width of the main body 11 can also be determined based on the maximum shaft hole depth on the pump truck boom, so that the elastic shielding plate 1 can be applied to all shaft holes 5 on the pump truck boom, improving the versatility of the elastic shielding plate 1. At the same time, the smaller the depth of the shaft hole 5, the larger the main body 11 of the elastic shielding plate 1 protrudes from the shaft hole 5.

[0050] In the embodiment of the present invention, the elastic shielding plate 1 is made of at least one of polypropylene (PP), polysulfone (PSF) and acrylonitrile butadiene styrene (ABS). Of course, the present invention is not limited thereto, and other suitable non-metallic elastic materials are also acceptable.

[0051] In the embodiment of the present invention, the thickness of the elastic shielding plate 1 may be 0.2 mm to 2.0 mm. The specific thickness of the elastic shielding plate 1 may be determined according to the specific size of the shaft hole 5 .

[0052] The shielding workpiece for the inner wall of the shaft hole provided by the present invention can replace the manual greasing method to shield and protect the shaft hole 5, thereby saving the time of greasing and scraping grease; compared with the grease that cannot be reused, the use of shielding tools is less expensive and more environmentally friendly; in addition, when using shielding tools, there is no need to consider the impact of greasing on the sandblasted surface, so that the painting steps of the parts can be adjusted, and the shielding protection of the shaft hole 5 can be advanced to cover the sandblasting process, so that sandblasting will not affect the accuracy of the shaft hole 5.

[0053] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A shielding workpiece for the inner wall of a shaft hole, characterized in that: The shielding workpiece for the inner wall of the shaft hole comprises an elastic shielding plate (1), the elastic shielding plate (1) being wound from a straight shape into a cylindrical shape and being placed in the shaft hole (5) so as to elastically adhere to the inner wall of the shaft hole (5) through radial elastic force; The length of the elastic shielding plate (1) is set to be greater than the circumference of the shaft hole (5), and the elastic shielding plate (1) is wound along the length direction and forms an outer ring (111) elastically fitted with the inner wall of the shaft hole (5) and an inner ring (112) elastically fitted with the outer ring (111); The free end of the outer ring (111) formed by the winding of the elastic shielding plate (1) is provided with a chamfer (2) on the side facing away from the inner wall of the shaft hole (5), so that the chamfered surface formed by the chamfer (2) is fitted with the inner ring (112) and the step gap between the free end of the outer ring (111) and the wall surface of the shaft hole (5) is reduced; The elastic shielding plate (1) is provided with a hand-holding opening (3) and a hand-holding portion (12) at both ends. The hand-holding opening (3) is used to be located on the outer ring (111) when the elastic shielding plate (1) is wound. When the hand-holding opening (3) is located on the outer ring (111), the hand-holding portion (12) is located on the innermost inner ring (112), so that the outer diameter of the winding of the elastic shielding plate (1) can be adjusted by holding the hand-holding opening (3) and the hand-holding portion (12) with two hands.

2. The shielding workpiece for the inner wall of a shaft hole according to claim 1, characterized in that: The angle between the chamfered surface and the side surface of the elastic shielding plate (1) used for contacting the inner wall of the shaft hole (5) is 15° to 45°.

3. The shielding workpiece for the inner wall of a shaft hole according to claim 1, characterized in that: The elastic shielding plate (1) comprises a main body (11) and a hand-held portion (12) extending outward from one side of the main body (11); the main body (11) is wound from a straight shape into a cylindrical shape and is used to be placed in the shaft hole (5) to form the outer ring (111) and the inner ring (112) and to allow the hand-held portion (12) to extend out of the shaft hole (5).

4. The shielding workpiece for the inner wall of a shaft hole according to claim 3, characterized in that: A hand-holding opening (3) is also provided on the main body (11), and the hand-holding opening (3) and the hand-holding portion (12) are respectively provided at two ends of the main body (11), and the hand-holding opening (3) is used to be located on the outer ring (111) when the main body (11) is wound.

5. The shielding workpiece for the inner wall of a shaft hole according to claim 3, characterized in that: The main body (11) is square, and a notch (4) corresponding to the hand-held portion (12) is formed on a side of the main body (11) away from the hand-held portion (12).

6. The shielding workpiece for the inner wall of a shaft hole according to claim 3, characterized in that: The width of the main body (11) is set to be greater than or equal to the depth of the shaft hole (5).

7. The shielding workpiece for the inner wall of a shaft hole according to any one of claims 1 to 6, characterized in that: The material of the elastic shielding plate (1) is at least one of polypropylene, polysulfone and acrylonitrile-butadiene-styrene plastic.

8. The shielding workpiece for the inner wall of a shaft hole according to any one of claims 1 to 6, characterized in that: The thickness of the elastic shielding plate (1) is 0.2 mm to 2.0 mm.

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