A hole opening tool for spline holes on the surface of a fuel tank

Abstract

The present invention discloses a hole-opening tool for spline holes on the surface of an oil tank, comprising a tool body and a base, wherein two vertical sides of the lower end of the tool body are provided with a tool having a spline notch cross-section shape that can be flipped relative to the tool body, a limiting hole having a spline notch cross-section shape for the tool body and the tool to vertically pass through is provided in the middle of the base, and a connecting rod assembly for driving the tool body to move upward is detachably provided at the upper end of the tool body, so as to realize the opening of the spline hole on the surface of the oil tank between the tool and the limiting hole. The above-mentioned hole-opening tool for spline holes on the surface of the oil tank can realize the opening of the spline hole on the oil tank through the combined action of the tool having a spline notch cross-section shape and the limiting hole, and the impurities cut off enter the limiting hole together with the tool, thereby preventing the impurities from falling into the oil tank during the hole-opening process, and the hole-opening process is fast and convenient, and easier to realize.

Description

Technical Field

[0001] The invention relates to the technical field of spline holes, and in particular to a hole-opening tool for spline holes on the surface of an oil tank. Background Art

[0002] The oil float is used as a sensor device for detecting the oil level and is positioned and installed with the fuel tank through a spline hole. The spline hole on the fuel tank is processed by a punching process.

[0003] Generally, the oil floats of vehicles leaving the factory are of fixed sizes. The installation sizes of oil floats in the aftermarket vary, and they often do not match the spline holes on the fuel tank. The problem is usually solved by replacing the fuel tank assembly, replacing accessories again, or dismantling the fuel tank and re-drilling holes. Replacing the fuel tank assembly and re-changing accessories often takes a long time and brings inconvenience.

[0004] The commonly used methods for re-opening holes are laser cutting or manual marking and then grinding to spline holes. The laser cutting method can quickly realize spline holes, but it often requires large laser cutting equipment. Except for some professional manufacturers that will be equipped with large laser cutting equipment, general after-sales service stations will hardly be equipped with it. Therefore, the equipment conditions required for the laser cutting method are relatively harsh and difficult to implement; for the method of manual marking and then grinding, it is easier to implement and is not limited by large equipment. Specifically, a circular hole smaller than the spline hole is first opened, and then the spline size is drawn according to the size of the oil float, and the spline hole is opened by a file or other grinding tool. The method of manual marking and then grinding is easier to implement than the laser cutting method, but there is a problem of low efficiency. During the manual processing process, there is also a hidden danger that impurities under grinding fall into the fuel tank and affect the cleanliness of the vehicle's oil circuit. Therefore, how to provide a tool for opening spline holes on the surface of the fuel tank that can be manually opened quickly without the help of tools through machine equipment outdoors and can avoid impurities falling into the fuel tank when opening the hole is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a hole-opening tool for spline holes on the surface of an oil tank, wherein the tool body is driven to move by a connecting rod assembly, and the moving tool cuts the surface of the oil tank between the base and the tool, and the spline hole on the oil tank is opened under the joint action of the tool having a spline groove cross-section shape and the limiting hole of the base, and the impurities cut off enter the limiting hole together with the tool, thereby preventing the impurities from falling into the oil tank during the hole opening, and the hole opening process is quick, convenient, and easier to implement.

[0006] To achieve the above-mentioned purpose, the present invention provides a hole-opening tool for spline holes on the surface of an oil tank, comprising a tool body and a base, wherein two vertical sides of the lower end of the tool body are provided with tools with a spline groove cross-section shape that can be flipped relative to the tool body, and a limiting hole with a spline groove cross-section shape for allowing the tool body and the tool to vertically pass through the middle of the base, and a connecting rod assembly for driving the tool body to move upward is detachably provided on the upper end of the tool body, so as to realize the spline hole opening on the surface of the oil tank between the tool and the limiting hole.

[0007] Preferably, rotary cutter shafts extending in directions perpendicular to the vertical axis are symmetrically provided on both vertical sides of the lower end of the tool body, and the tool is rotatably connected to the tool body via the rotary cutter shafts.

[0008] Preferably, the connecting rod assembly includes a shaft rod that is transversely inserted into the upper end of the tool body and an eccentric rod that is rotatably connected at both ends of the shaft rod.

[0009] Preferably, the eccentric rod comprises an eccentric disk and an extension rod, the extension rod is fixedly connected to the eccentric disk, and the eccentric disk is provided with an eccentric opening for the shaft rod to penetrate.

[0010] Preferably, it also includes a lifting rod provided at the upper end of the tool body for holding.

[0011] Preferably, the tool body comprises a first cylinder whose upper end is used to connect to the connecting rod assembly and a second cylinder whose lower end is used to connect to the tool, and the first cylinder and the second cylinder are vertically arranged along an axis and fixedly connected.

[0012] Preferably, the limiting hole comprises a pair of first limiting grooves and a pair of second limiting grooves extending along arc lines, and the arc radius of the first limiting grooves is smaller than the arc radius of the second limiting grooves.

[0013] Preferably, it also includes a limit card for positioning the base on the surface of the oil tank.

[0014] Preferably, a positioning groove for the limit card to be engaged is provided on the circumference of the base.

[0015] Preferably, there are two positioning grooves symmetrically arranged on the base, and there are two limiting clips.

[0016] Compared with the above-mentioned background technology, the hole-punching tool for spline holes on the surface of an oil tank provided by the present invention comprises a tool body and a base, a connecting rod assembly is detachably provided on the upper end of the tool body, tools are provided on both sides of the lower end of the tool body, a limiting hole is provided in the middle of the base for the tool body and the tool to vertically pass through, the tool and the limiting hole have the same spline groove cross-sectional shape, when the hole-punching tool for spline holes on the surface of an oil tank is used to punch spline holes in the oil tank, the tool body descends from the limiting hole in the middle of the base and enters a preset circular hole on the surface of the oil tank, and the total cross-section of the tool and the tool body is reduced by folding the tool relative to the tool body so as to enter the preset circular hole, at this time, the base and the tool are respectively located in the oil tank. The inside and outside of the tank, that is, the upper and lower sides of the surface of the oil tank, are flattened by folding the tool relative to the tool body to achieve parallel correspondence between the tool with a spline groove cross-section shape and the limiting hole with a spline groove cross-section shape. The tool body is driven to move upward relative to the base through the connecting rod assembly to provide power for the tool to move upward and cut. The spline hole on the surface of the oil tank is opened by the cutting surface of the tool and the limiting hole with the same spline groove cross-section shape and the cutting power of the tool for upward cutting. The upward cutting of the tool toward and into the limiting hole allows the cut impurities to enter the limiting hole together with the tool to prevent impurities from falling into the oil tank. The hole opening process is fast, convenient, and easier to achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a hole-opening tool for a spline hole on a fuel tank surface provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a tool body provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a tool body provided by an embodiment of the present invention being assembled into a base;

[0021] Figure 4 A schematic diagram of the structure of the tool body and the base provided in an embodiment of the present invention before entering the circular hole on the surface of the oil tank;

[0022] Figure 5 A schematic diagram of the structure of the tool body and the base provided in an embodiment of the present invention after entering the circular hole on the surface of the oil tank;

[0023] Figure 6A schematic diagram of the structure of the tool body and the base provided in the embodiment of the present invention after entering the circular hole on the surface of the oil tank and preparing to open a hole;

[0024] Figure 7 A schematic diagram of the assembly structure of the eccentric rod on the tool body provided by an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of the effect of the eccentric rod provided in an embodiment of the present invention;

[0026] Fig. 9 A schematic diagram of the effect of a tool for drilling spline holes on a fuel tank surface provided by an embodiment of the present invention;

[0027] Fig.10 A top view of a base provided by an embodiment of the present invention;

[0028] Fig.11 A schematic diagram of the effect of the limit card provided in an embodiment of the present invention;

[0029] Fig.12 A schematic structural diagram of a first spline groove provided in an embodiment of the present invention;

[0030] Fig.13 A schematic structural diagram of a spline hole provided in an embodiment of the present invention.

[0031] in:

[0032] 1-eccentric rod, 2-tool body, 21-lifting rod, 22-shaft hole, 23-tool, 24-rotating tool shaft, 3-shaft rod, 4-limiting card, 5-base, 51-positioning groove, 59-limiting hole, 591-first limiting groove body, 592-second limiting groove body, 9-oil tank, 90-spline hole, 91-first spline groove, 910-circular hole arc body, 911-second spline groove body, 912-first spline groove body. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Please refer to Figures 1 to 13 ,in, Figure 1A schematic diagram of the structure of a hole-opening tool for a spline hole on a fuel tank surface provided by an embodiment of the present invention, Figure 2 A schematic diagram of the structure of a tool body provided by an embodiment of the present invention, Figure 3 A schematic diagram of the structure of a tool body provided by an embodiment of the present invention being assembled into a base. Figure 4 This is a schematic diagram of the structure of the tool body and the base provided by the embodiment of the present invention when they are assembled into the circular hole of the box skin. Figure 5 This is a schematic diagram of the structure of the tool body and the base provided by the embodiment of the present invention after being assembled into the circular hole of the box skin. Figure 6 A schematic diagram of the structure of the tool body and the base provided by the embodiment of the present invention after being assembled into the circular hole of the box skin and ready to be opened. Figure 7 A schematic diagram of the assembly structure of the eccentric rod on the tool body provided by an embodiment of the present invention, Figure 8 A schematic diagram of the effect of the eccentric rod provided in an embodiment of the present invention, Fig. 9 A schematic diagram of the effect of a tool for drilling spline holes on a fuel tank surface provided by an embodiment of the present invention, Fig.10 A top view of a base provided by an embodiment of the present invention, Fig.11 A schematic diagram of the effect of the limit card provided in an embodiment of the present invention, Fig.12 A schematic structural diagram of a first spline groove provided in an embodiment of the present invention, Fig.13 A schematic structural diagram of a spline hole provided in an embodiment of the present invention.

[0036] In a first specific embodiment, the hole-opening tool for spline holes on the surface of an oil tank provided by the present invention comprises a tool body 2 and a base 5. The upper end of the tool body 2 is detachably provided with a connecting rod assembly for driving the tool body 2 to move upward relative to the base 5. A tool 23 is provided at the lower end of the tool body 2. The tool 23 is arranged on both vertical sides of the lower end of the tool body 2. The tool 23 is rotatably connected to the tool body 2, that is, the tool 23 can be flipped relative to the tool body 2. A limiting hole 59 is provided in the middle of the base 5 for the tool body 2 and the tool 23 to pass vertically. The limiting hole 59 and the tool 23 have the same spline groove cross-sectional shape.

[0037] In the present embodiment, when the hole-opening tool for spline holes on the surface of the oil tank opens the spline hole 90 in the oil tank 9, a circular hole is first opened on the surface of the oil tank 9. It should be noted that conventional technical means such as a hole opener can be used for opening the circular hole. Because the method of opening the circular hole does not belong to the improved content of the present invention, it will not be repeated here.

[0038] The tool body 2 moves downward relative to the base 5 in the limiting hole 59 in the middle of the base 5. In order to avoid interference between the tool 23 in the unfolded state and the edge of the limiting hole 59, the tool 23 is flipped relative to the tool body 2 to reduce the total cross-sectional area of ​​the tool 23 and the tool body 2 so that the tool 23 enters the circular hole opened on the surface of the oil tank 9 together with the tool body 2. After the tool 23 enters the oil tank 9 on the tool body 2, the tool 23 is located in the oil tank 9, that is, on the lower side of the surface of the oil tank 9, and the base 5 is located outside the oil tank 9, that is, on the upper side of the surface of the oil tank 9, and the circular hole opened on the surface of the oil tank 9 is located between the base 5 and the tool 23. The tool 23 and the limiting hole 59 in the base 5 have a spline notch cross-sectional shape, and the tool 23 and the base 5 are correspondingly arranged on both sides of the circular hole.

[0039] It should be noted that the radial dimension of the spline groove cross-section is greater than the radial dimension of the circular hole. When the connecting rod assembly drives the tool body 2 to move upward relative to the base 5, the tool 23 with a spline groove cross-section shape and the limiting hole 59 serve as cutting surfaces. Under the action of the cutting force of the upward movement of the tool 23, the circular hole arc 910 on the outer edge of the circular hole is cut to realize the opening of the spline hole 90.

[0040] In this embodiment, there are two cutters 23 and they are symmetrically arranged on both sides of the lower end of the cutter body 2. A rotary cutter shaft 24 is arranged on both sides of the lower end of the cutter body 2. The extension direction of the rotary cutter shaft 24 is perpendicular to the vertical axis. The two cutters 23 are respectively connected to the cutter body 2 through the rotary cutter shaft 24 on the corresponding side. It should be noted that in order to ensure that the cutter 23 enters the preset circular hole together with the cutter body 2 without interference, the cutter 23 is flipped relative to the cutter body 2 to reduce the cross-sectional area passing through the preset circular hole. More specifically, the rotary cutter shaft 24 is located in a plane perpendicular to the penetration direction of the cutter body 2, and the connection between the cutter 23 and the rotary cutter shaft 24 is used to realize the flipping of the cutter 23 relative to the plane.

[0041] In this embodiment, the tool 23 has a maximum flip angle relative to the tool body 2 on the rotary cutter shaft 24, has a first motion limit when the tool 23 is flattened, that is, the tool 23 is located in a plane perpendicular to the insertion direction of the tool body 2, at which time the angle between the tool 23 and the horizontal plane is 0°, and has a maximum flip angle, that is, a second motion limit, when the tool 23 is flipped upward to 80° relative to the rotary cutter shaft 24. When the tool body 2 enters the preset circular hole through the limiting hole 59 of the base 5, the tool 23 is adjusted within the range of 0° to 80° to meet the condition of entering the preset circular hole without obstruction. After the tool 23 enters the oil tank 9, the folded tool 23 is flattened so that the tool 23 is fixed when it is located at the first motion limit, and at this time the angle between the tool 23 and the plane perpendicular to the insertion direction of the tool body 2 is 0°.

[0042] More specifically, the connecting rod assembly includes a shaft rod 3 that is laterally inserted into the upper end of the tool body 2 and an eccentric rod 1 that is rotatably connected at both ends of the shaft rod 3. Similarly, the upper end of the tool body 2 is provided with an axle hole 22 for the shaft rod 3 to be laterally inserted. It should be noted that the shaft rod 3 is detachably connected to the tool body 2, and the eccentric rod 1 is detachably connected to the shaft rod 3. When the tool body 2 enters the preset circular hole through the limiting hole 59 of the base 5, the eccentric rod 1 and the shaft rod 3 are both removed, and the tool body 2 moves downward relative to the base 5, that is, the base 5 moves upward relative to the tool body 2. The cross-section of the upper end of the tool body 2 from which the eccentric rod 1 and the shaft rod 3 are removed is less than or equal to the limiting hole 59 of the base 5, and the base 5 moves upward to the upper end of the tool body 2, at which time the base 5 blocks the axle hole 22. Furthermore, the tool 23 and the lower end of the tool body 2 enter the oil tank 9, the base 5 moves downward at the upper end of the tool body 2 and fits with the tool 23 on the upper and lower sides of the surface of the oil tank 9 respectively. At this time, the tool body 2 exposes the obstructed through-axis hole 22 due to the downward movement of the base 5, the shaft rod 3 is inserted into the through-axis hole 22 and eccentric rods 1 are installed at both ends of the shaft rod 3. The tool body 2 is driven to move through the connecting rod assembly and then the motion cutting force is provided to the tool 23 to realize the cutting of the circular hole arc 910 on the outer edge of the circular hole on the surface of the oil tank 9 by the tool 23.

[0043] In this embodiment, the eccentric rod 1 includes an eccentric disc and an extension rod, the extension rod is fixedly connected to the eccentric disc, and the eccentric disc is provided with an eccentric opening for the shaft rod 3 to be inserted. The extension rod is manually held and the eccentric disc is driven to rotate around the shaft rod 3. At a certain angle, the lower side of the eccentric disc is in contact with the upper surface of the base 5. When the extension rod is continued to be driven and the eccentric disc is driven to rotate on the upper surface of the base 5, the eccentric disc acts on the base 5 and applies downward pressure. Under the action of the downward pressure, the tool body 2 drives the unfolded tool 23 to move upward and cuts the circular hole arc 910 on the outer edge of the circular hole.

[0044] When the extension rod drives the eccentric disk to rotate around the shaft 3, the vertical distance between the eccentric opening of the eccentric disk and the bottom side of the eccentric disk changes continuously. It should be noted that the vertical distance between the eccentric opening and the bottom side of the eccentric disk has a first distance and a second distance. At the first distance, the vertical distance between the eccentric opening and the bottom side of the eccentric disk is the smallest. At this time, there is a space between the eccentric disk and the base 5, and the bottom side of the eccentric disk does not contact the upper surface of the base 5; at the second distance, the vertical distance between the eccentric opening and the bottom side of the eccentric disk is the largest. At this time, the bottom side of the eccentric disk is in close contact with the upper surface of the base 5 and the tool 23 moves upward under the action of the force applied by the eccentric disk and has entered the limit hole 59. That is to say, in the process that the extension rod drives the eccentric disc to rotate, so that the vertical distance between the eccentric opening and the bottom side of the eccentric disc gradually increases from the first distance to the second distance, the distance between the eccentric disc and the upper surface of the base 5 gradually decreases and has a contact state. At this time, the eccentric disc has a third distance, and the third distance is in the interval between the first distance and the second distance; in the process that the extension rod drives the eccentric disc to gradually increase from the third distance to the second distance, the tool body 2 begins to move upward in the limiting hole 59, and the tool 23 moves toward the surface of the oil tank 9 driven by the tool body 2 and is about to enter the limiting hole 59. At the moment of cutting the circular hole arc 910 at the outer edge of the circular hole on the surface of the oil tank 9, the eccentric disk has a fourth distance, and the fourth distance is in the interval between the third distance and the second distance; in the process of the extension rod driving the eccentric disk to gradually increase from the fourth distance toward the second distance, the tool 23 fits the outer edge of the circular hole on the surface of the oil tank 9 and cuts under the drive of the tool body 2, and the impurities cut by the tool 23 enter the limiting hole 59 together with the tool 23 on the upper surface of the tool 23 and stop moving when the eccentric disk rotates to the second distance. At this time, the tool 23 and the tool body 2 have the maximum height that the eccentric disk can lift.

[0045] In order to facilitate the tool body 2 to be placed in the oil tank 9 through the circular hole, a lifting rod 21 for holding is provided at the upper end of the tool body 2. More specifically, the lifting rod 21 is a semicircular arc rod, and the tool body 2 can be placed before the hole is opened and taken out after the hole is opened by manually holding the arc rod.

[0046] In addition, the tool body 2 includes a first cylinder for connecting the connecting rod assembly at the upper end and a second cylinder for connecting the tool 23 at the lower end. The first cylinder and the second cylinder are vertically arranged along the axis and fixedly connected. Before the hole-making tool is used to make a hole, a circular hole needs to be opened on the surface of the oil tank 9. In order to facilitate the tool body 2 to pass through the circular hole and be placed in the oil tank 9, the upper and lower ends of the tool body 2 are set as the first and second cylindrical cylinders with circular cross-sections. Similarly, in order to facilitate stable and fixed placement on the surface of the oil tank 9, the base 5 is set as a hollow cylinder with a limiting hole 59 in the middle. It should be noted that the holes opened on the surface of the oil tank 9 include but are not limited to circular holes, and the tool body 2 and the base 5 include but are not limited to the cylindrical setting mode. The circular cross-section has been described as the optimal solution in this embodiment. The setting modes for other cross-sectional shapes such as square, triangle and diamond also belong to the description scope of this embodiment.

[0047] In addition, setting the upper and lower ends of the tool body 2 as cylindrical structures also takes into account the requirements of structural stiffness. A square cross-section connector is used for the middle part of the tool body 2, which only serves to connect the upper and lower ends of the tool body 2, so as to save the material of the tool, reduce the overall weight of the tool, and improve the use and operation performance of the tool.

[0048] In this embodiment, the cutter 23 and the limiting hole 59 have a spline notch cross-section shape, and an upward cutting force is provided to the cutter 23 through the connecting rod assembly, and the surface of the oil tank 9 between the cutter 23 and the limiting hole 59 realizes the opening of the spline hole 90 under the cutting action of the cutter 23. In this embodiment, the outer edge of the spline hole 90 is formed into six groups of spline notches equidistantly distributed around the center of a circle, and each group of spline notches includes a second spline groove body 911 with a large diameter and a first spline groove body 912 with a small diameter. In a specific embodiment, the cross-sectional shape of the spline groove of the tool 23 and the limiting hole 59 is two groups of spline grooves symmetrically distributed with the center of a circle, and the outer edge of the limiting hole 59 is provided with a second limiting groove body 592 with a large diameter corresponding to the second spline groove body 911 and a first limiting groove body 591 with a small diameter corresponding to the first spline groove body 912. The two tools 23 are symmetrically located on both sides of the lower end of the tool body 2, and each tool 23 is provided with a large-diameter blade that fits with the second limiting groove body 592 during cutting to achieve cutting of the large-diameter second spline groove body 911 and a small-diameter blade that fits with the first limiting groove body 591 during cutting to achieve cutting of the small-diameter first spline groove body 912.

[0049] In this embodiment, the spline hole 90 is divided into six groups of spline grooves with equal distances from the center of a circle on the outer edge, and the spline hole 90 is punched by two groups at a time and six groups three times using the hole punching tool for the spline holes on the surface of the oil tank.

[0050] Specifically, a pair of cutters 23 symmetrically arranged on both sides of the lower end of the tool body 2 act on the surface of the oil tank 9, and the circular hole arc 910 on the outer edge of the circular hole is cut to form a first spline groove 91. The first spline groove 91 includes two groups of spline grooves symmetrically distributed with the center of the circle, and each group of spline grooves includes a second spline groove body 911 with a large diameter and a first spline groove body 912 with a small diameter. Similarly, the angle of the base 5 and the tool body 2 in the circular hole is changed to achieve the cutting of the spline grooves twice, totaling four groups. At this time, it can be regarded as the cutting of the second spline groove body 911 and the third spline groove body similar to the first spline groove body 912. The second spline groove body 911 and the third spline groove body have the same structure as the first spline groove body 912 and only the angle changes. Under the combination of the first spline groove body 912, the second spline groove body 911 and the third spline groove body, the outer edge is formed into a spline hole 90 with six groups of spline grooves equidistantly distributed with the center of the circle.

[0051] In order to achieve accurate positioning of the hole punching tool for the spline hole on the surface of the oil tank 9, a limit card 4 is also included to achieve positioning of the base 5 on the oil tank 9. In this embodiment, the circumference of the base 5 is provided with a positioning groove 51 for the limit card 4 to engage, and the positioning grooves 51 are specifically two and symmetrically arranged on the circumference of the base 5. Similarly, there are also two limit cards 4.

[0052] In this embodiment, the arc surface of the positioning groove 51 for the limit card 4 to fit and engage with the arc surface of the second limit groove body 592 with a large diameter are located on a concentric circle, and the angle between the positioning groove 51 and the second limit groove body 592 is 60°. It should be noted that after the tool 23 cuts two groups of spline grooves symmetrically distributed with the center of the circle on the surface of the oil tank 9 in the first drilling, the tool 23 is taken out together with the impurities cut by the tool 23, and then the tool 23 is put back into the oil tank 9 according to the above process for the second drilling. It should be noted that the tool body 2 and the base 5 need to be rotated forward or reversely in the circular hole by 60° or the sum of 60° and any multiple of 180°, the limit card 4 is engaged in the positioning groove 51, and the lower part of the limit card 4 is inserted into the second spline groove body 911 in the first drilling to realize the positioning of the base 5 on the oil tank 9. The second drilling process is the same as the first drilling process, which will not be repeated here. Similarly, after the second drilling, the tool 23 is taken out together with the impurities cut by the tool 23, and the base 5 and the tool body 2 on the oil tank 9 are repositioned. It should be noted that the tool body 2 and the base 5 continue to rotate 60° or the sum of 60° and any multiple of 180° in the circular hole, and the rotation direction must be the same as the rotation direction during the second drilling. At this time, the limit card 4 is engaged in the positioning groove 51, and the lower part of the limit card 4 is inserted into the large-diameter spline groove body in the second drilling. After the positioning is completed, the third drilling is performed. In summary, the circular hole on the surface of the oil tank 9 is positioned and drilled by the hole-opening tool for the spline hole on the surface of the oil tank, and the spline hole 90 with six groups of spline grooves equidistantly distributed around the center of the circle on the outer edge is drilled. It should be noted that this embodiment only provides a specific implementation method of the positioning groove 51. The positioning groove 51 can also be set in a concentric circle with the arc surface of the first limiting groove body 591 of the small diameter. At this time, the angle between the positioning groove 51 and the first limiting groove body 591 is 60°. There are many similar settings, which will not be described here one by one.

[0053] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0054] The above is a detailed introduction to the hole-opening tool for the spline hole on the surface of the oil tank provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hole-opening tool for a spline hole on a fuel tank surface, characterized in that: The utility model comprises a tool body (2) and a base (5), wherein two vertical sides of the lower end of the tool body (2) are provided with tools (23) with a spline groove cross-section shape which can be turned relative to the tool body (2), and a limiting hole (59) with a spline groove cross-section shape for allowing the tool body (2) and the tool (23) to vertically pass through is provided in the middle of the base (5), and a connecting rod assembly for driving the tool body (2) to move upward is detachably provided at the upper end of the tool body (2), and an upward cutting force is provided to the tool (23) through the connecting rod assembly, so as to realize the opening of a spline hole (90) on the surface of the oil tank (9) between the tool (23) and the limiting hole (59); The outer edge of the spline hole (90) is formed into six groups of spline slots equidistantly distributed around the center of a circle, each group of the spline slots includes a second spline slot body (911) with a large diameter and a first spline slot body (912) with a small diameter, the limiting hole (59) includes a pair of first limiting slot bodies (591) and a pair of second limiting slot bodies (592) extending along an arc line, the arc radius of the first limiting slot body (591) is smaller than the arc radius of the second limiting slot body (592), and the second limiting slot body (592) and the first spline slot body ( 912), the first limiting groove body (591) corresponds to the second spline groove body (911), the two cutting tools (23) are symmetrically located on both sides of the lower end of the cutting tool body (2), and each of the cutting tools (23) is provided with a large-diameter cutting edge that fits with the second limiting groove body (592) during cutting to achieve the cutting of the second spline groove body (911) with a large diameter, and a small-diameter cutting edge that fits with the first limiting groove body (591) during cutting to achieve the cutting of the first spline groove body (912) with a small diameter; The drilling tool for the spline hole on the surface of the oil tank also includes a limit card (4) for realizing the positioning of the base (5) on the surface of the oil tank (9); a positioning groove (51) for the limit card (4) to be engaged is provided on the circumference of the base (5); and the lower part of the limit card (4) is inserted into the second spline groove body (911) to realize the positioning of the base (5) on the oil tank (9); the arc surface on the positioning groove (51) for the limit card (4) to be engaged and engaged is located on a concentric circle with the arc surface of the second limit groove body (592) with a large diameter; and the angle between the positioning groove (51) and the second limit groove body (592) is 60°; The connecting rod assembly comprises a shaft rod (3) which is laterally inserted into the upper end of the tool body (2) and an eccentric rod (1) which is rotatably connected to both ends of the shaft rod (3); the upper end of the tool body (2) is provided with a through-shaft hole (22) for the shaft rod (3) to be laterally inserted; the shaft rod (3) is detachably connected to the tool body (2); and the eccentric rod (1) is detachably connected to the shaft rod (3); When the tool body (2) enters the preset circular hole through the limiting hole (59) of the base (5), the eccentric rod (1) and the shaft rod (3) are both removed; the tool body (2) moves downward relative to the base (5), that is, the base (5) moves upward relative to the tool body (2), and the cross-section of the upper end of the tool body (2) after the eccentric rod (1) and the shaft rod (3) are removed is smaller than or equal to the size of the limiting hole (59) of the base (5); the base (5) moves relative to the tool body (2) to the upper end of the tool body (2) to cover the through-axis hole (22); the tool (23) is moved together with the tool body (2) ) enters the oil tank (9); the base (5) moves downward at the upper end of the tool body (2) and fits with the tool (23) on the upper and lower sides of the surface of the oil tank (9), respectively, and the tool body (2) exposes the obstructed through-axis hole (22) due to the downward movement of the base (5); the shaft (3) is inserted into the through-axis hole (22) and the eccentric rod (1) is installed at both ends of the shaft (3), and the tool body (2) is driven to move by the connecting rod assembly, and the circular hole arc (910) on the outer edge of the circular hole is cut under the action of the cutting power of the upward movement of the tool (23) to realize the opening of the spline hole (90).

2. The hole-opening tool for spline holes on the surface of a fuel tank according to claim 1, characterized in that: Rotating cutter shafts (24) extending in a direction perpendicular to the vertical axis are symmetrically provided on both vertical sides of the lower end of the cutter body (2), and the cutter (23) is rotatably connected to the cutter body (2) via the rotating cutter shafts (24).

3. The hole-opening tool for spline holes on the surface of a fuel tank according to claim 1, characterized in that: The eccentric rod (1) comprises an eccentric disk and an extension rod, the extension rod is fixedly connected to the eccentric disk, and the eccentric disk is provided with an eccentric opening for the shaft rod (3) to penetrate.

4. The hole-opening tool for spline holes on the surface of a fuel tank according to claim 1, characterized in that: It also includes a lifting rod (21) disposed at the upper end of the tool body (2) for holding.

5. The hole-opening tool for spline holes on the surface of a fuel tank according to claim 1, characterized in that: The tool body (2) comprises a first cylinder whose upper end is used to connect to the connecting rod assembly and a second cylinder whose lower end is used to connect to the tool (23); the first cylinder and the second cylinder are vertically arranged along an axis and fixedly connected.

6. The drilling tool for spline holes on the surface of a fuel tank according to any one of claims 1 to 4, characterized in that: There are two positioning grooves (51) symmetrically arranged on the base (5), and there are two limit clamps (4).

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