A method for removing a corroded screw

Abstract

The invention discloses a method for removing a rusted screw rod, and relates to the technical field of removing broken wires. The method specifically comprises the following steps: S1, cutting the rod body of the rusted screw rod exposed on the outside, processing the rusted screw rod at the cutting surface toward the axial center of the rusted screw rod to form a borehole, and determining the borehole depth H0 and the borehole diameter D according to the diameter of the rusted screw rod, and processing a thread inside the borehole; S2, selecting a suitable broken wire extractor according to the borehole diameter D, and the thread of the tap part of the broken wire extractor is opposite to the thread of the inner wall of the borehole; S3, wedging the tap part of the broken wire extractor into the borehole, the wedging depth of the tap part of the broken wire extractor into the borehole is H, and ensuring that the borehole depth H0 is greater than the sum of the wedging depth H of the broken wire extractor and the reserved matching depth h. The method provides precise control of the removal process, improves the removal efficiency, and reduces potential damage to the structure.

Description

Technical Field

[0001] The invention relates to the technical field of broken wire removal, and more particularly to a method for removing a corroded screw. Background Art

[0002] Corroded screws are a common problem in the industrial and construction sectors. Due to environmental factors and material aging, screws may corrode over time, making them difficult to remove from the structure, especially if replacement or repair is required.

[0003] Rust causes the screw to be tightly bonded to the surrounding structure. Traditional removal methods such as direct knocking or using ordinary tools are often difficult to effectively remove the screw. When trying to remove the rusted screw, due to the tight bond between the screw and the surrounding structure, it may even cause the screw to break or the structure itself to be damaged, increasing maintenance costs. There are also methods of removing rusted screws with a broken wire extractor, but there is a lack of control over the drilling depth and the wedging depth of the broken wire extractor, resulting in the breakage of the rusted screw or incomplete removal during the removal process.

[0004] Therefore, how to provide a removal method that can accurately control the wedging depth during the removal process and reduce damage to the rusted screw and structure is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a method for removing a corroded screw, aiming to solve the above technical problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for removing a corroded screw, comprising the following steps:

[0008] S1, cutting the exposed outer rod of the corroded screw, processing the cut surface of the corroded screw toward the axial center of the corroded screw to form a drill hole, and determining the drill hole depth H0 and the drill hole diameter D according to the diameter of the corroded screw, and processing the inside of the drill hole with threads;

[0009] S2. Select a suitable broken wire extractor according to the borehole diameter D, wherein the thread of the tap part of the broken wire extractor is opposite to the thread of the inner wall of the borehole;

[0010] S3, wedging the tap part of the broken wire extractor into the drilled hole, the wedging depth of the tap part of the broken wire extractor into the drilled hole is H, and ensuring that the drilling depth H0 is greater than the sum of the wedging depth H of the broken wire extractor and the reserved fitting depth h.

[0011] Through the above technical scheme, the present invention provides a method for removing a rusted screw rod, which includes cutting the rusted screw rod, drilling a hole, using a broken wire extractor, and ensuring that the drilling depth is greater than the wedging depth of the broken wire extractor and the reserved matching depth. This method provides precise control over the removal process, reduces potential damage to the structure, and ensures that the drilling depth is large enough so that the broken wire extractor can effectively wedge into the screw rod and provide sufficient torque to loosen and remove the screw rod; during the drilling process, a certain pressure and heat are applied to the rusted screw rod, resulting in local plastic deformation of the screw rod material, causing the screw rod to shrink slightly along the radial direction, thereby reducing the contact area between the rusted screw rod and the surrounding structure to a certain extent, and reducing friction; at the same time, the drilling process applies mechanical force to the rust layer, resulting in partial destruction or peeling of the rust layer, reducing the adhesion between the rusted screw rod and the surrounding structure, and further reducing the torque required to loosen the screw rod. Therefore, during the removal process, the deeper the drilling hole, the smaller the loosening torque, thereby improving the efficiency and safety of the removal.

[0012] Preferably, in the above-mentioned method for removing a corroded screw, the calculation formula of the drilling diameter D is:

[0013] D = dp;

[0014] Among them, d is the diameter of the corroded screw, and p is the pitch of the corroded screw. Through the diameter of the corroded screw and its pitch, the drilling diameter can be accurately calculated to adapt to different corroded screw sizes and improve the applicability and accuracy of the removal method.

[0015] Preferably, in the above-mentioned method for removing a corroded screw, the drilling diameter D is the maximum drilling diameter, and the calculation formula of the actual drilling diameter is:

[0016] Dactual = D*{1-(25% to 40%)}. This design can avoid structural damage caused by drilling too large a hole, while ensuring that there is enough space for removing the corroded screw.

[0017] Preferably, in the above-mentioned method for removing a corroded screw, in step S3, a steel hammer is first used to knock the tap part of the broken wire extractor into the inside of the drill hole, and initially engages with the thread of the inner wall of the drill hole, and then a wrench is used to twist the broken wire extractor to wedge the tap part of the broken wire extractor into the drill hole. The broken wire extractor can be wedged into the drill hole more stably, thereby improving the efficiency and safety of removing the corroded screw.

[0018] Preferably, in the above-mentioned method for removing a corroded screw, the calculation formula for the wedging depth H of the broken wire extractor is:

[0019]

[0020] Among them, K is the slope of the broken wire extractor, D1 is the handle diameter of the broken wire extractor, D2 is the head diameter of the broken wire extractor, H2 is the thread height of the tap part of the broken wire extractor, H3 is the projection length of the tap thread in the direction perpendicular to the thread axis, H is the wedging depth, and D is the drilling diameter. The slope of the tap affects its wedging area with the rusted screw drilling hole. The larger the wedging area, the easier it is for the broken wire extractor to fit tightly with the rusted screw drilling hole, and the screw can be loosened with fewer turns.

[0021] Preferably, in the above-mentioned method for removing a corroded screw, a torque sensor is installed on the handle of the broken wire extractor, which can measure the torque applied to the broken wire extractor in real time, ensure that the removal process is carried out within a safe parameter range, and prevent damage to the corroded screw or the broken wire extractor caused by excessive torque.

[0022] Preferably, in the above-mentioned method for removing a corroded screw, a displacement sensor is installed on the handle of the broken wire extractor, which can monitor the depth of the broken wire extractor wedging into the borehole, improve the accuracy of the removal process, and provide feedback on the removal progress.

[0023] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a method for removing a corroded screw, which has the following beneficial effects:

[0024] 1. The present invention can effectively remove the corroded screw from the structure by precise drilling and using a broken wire extractor, thereby avoiding damage to the corroded screw and the broken wire extractor that may be caused by traditional methods.

[0025] 2. The present invention reduces damage to surrounding structures by controlling the drilling depth and the wedging depth of the broken wire extractor. By calculating the drilling diameter and the wedging depth, and using torque sensors and displacement sensors, the extraction process can be accurately controlled to reduce uncertainty and risk in operation.

[0026] 3. The present invention can determine the drilling diameter according to the diameter and pitch of the corroded screw, so that it is suitable for corroded screws of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 The accompanying drawing is a schematic diagram of the structure of the broken wire extractor provided by the present invention wedged into the drill hole and tightly matched with the drill hole;

[0029] Figure 2 The accompanying drawing is a schematic structural diagram of a broken wire extractor provided by the present invention;

[0030] Figure 3 The accompanying drawings are schematic diagrams of the initial wedging state of the broken wire extractor provided by the present invention into the drill hole and the process of the close cooperation between the broken wire extractor and the drill hole.

[0031] in:

[0032] 1-Rusted screw;

[0033] 2- Drilling;

[0034] 3-Broken wire extractor. DETAILED DESCRIPTION

[0035] 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.

[0036] Participate in the Figure 1 To Attachment Figure 3 The present invention discloses a method for removing a corroded screw, which specifically comprises the following steps:

[0037] S1, cutting the exposed outer rod of the corroded screw 1, processing the cut surface of the corroded screw 1 toward the axial center of the corroded screw 1 to form a borehole 2, and determining the borehole depth H0 and the borehole diameter D according to the diameter of the corroded screw 1, and processing a thread inside the borehole 2;

[0038] S2. Select a suitable broken wire extractor 3 according to the borehole diameter D. The thread of the tap part of the broken wire extractor 3 is opposite to the thread of the inner wall of the borehole 2.

[0039] S3. Wedging the tap part of the broken wire extractor 3 into the drilled hole 2. The wedging depth of the tap part of the broken wire extractor 3 into the drilled hole 2 is H, and the drilling depth H0 is ensured to be greater than the sum of the wedging depth H of the broken wire extractor 3 and the reserved fitting depth h.

[0040] In order to further optimize the above technical solution, the calculation formula of the drilling diameter D is:

[0041] D = dp;

[0042] Where d is the diameter of the corroded screw and p is the pitch of the corroded screw.

[0043] In order to further optimize the above technical solution, the drilling diameter D is the maximum drilling diameter, and the calculation formula of the actual drilling diameter Dactual is:

[0044] Dactual=D*{1-(25%~40%)}.

[0045] In order to further optimize the above technical solution, in step S3, a steel hammer is first used to knock the tap part of the broken wire extractor 3 into the inside of the drill hole 2, and initially engages with the thread of the inner wall of the drill hole 2, and then a wrench is used to twist the broken wire extractor 3 to wedge the tap part of the broken wire extractor 3 into the drill hole 2.

[0046] In order to further optimize the above technical solution, the calculation formula of the wedging depth H of the broken wire extractor 3 is:

[0047]

[0048] Wherein, K is the slope of the broken wire extractor, D1 is the handle diameter of the broken wire extractor, D2 is the head diameter of the broken wire extractor, H2 is the thread height of the tap part of the broken wire extractor, H3 is the projection length of the tap thread in the direction perpendicular to the thread axis, H is the wedging depth, and D is the drill hole diameter.

[0049] In order to further optimize the above technical solution, a torque sensor is installed on the handle of the broken wire extractor.

[0050] In order to further optimize the above technical solution, a displacement sensor is installed on the handle of the broken wire extractor.

[0051] The embodiments of the present invention are:

[0052] Since only part of the thread of the screw is matched with the connector when in use, and the matching length is about 1 / 3 of the total length, the torque of the rusted screw 1 is too large when it is disassembled. Therefore, when taking out the rusted screw 1, the other non-matching part of the screw - 2 / 3 part is first cut off by a cutting machine. The reason for this is that the material strength of the broken wire extractor 3 is higher than that of the rusted screw 1, which can withstand a larger torque and is not easy to break; the cutting surface of the rusted screw 1 is processed by a radial drilling machine using a center drill to form a bore 2, and the depth of the bore 2 can be directly obtained using the radial drilling machine ruler; a steel hammer is needed to knock the tap part of the broken wire extractor 3 into the bore 2, and the tap part of the broken wire extractor 3 cooperates with the bore 2; the broken wire extractor 3 is twisted with a wrench, and as the number of turns increases, the reverse tap part of the broken wire extractor 3 will be wedged deeper into the bore 2, and the broken wire extractor 3 and the rusted screw 1 will also cooperate more and more tightly, and as the torque increases, the rusted screw 1 will be loosened.

[0053] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for removing a corroded screw, characterized in that: The specific steps include: S1, cutting the exposed outer rod of the corroded screw (1), processing the cut surface of the corroded screw (1) toward the axial center of the corroded screw (1) to form a borehole (2), and determining the borehole depth H0 and the borehole diameter D according to the diameter of the corroded screw (1), and processing the inside of the borehole (2) with a thread; S2. Select a suitable broken wire extractor (3) according to the borehole diameter D, wherein the thread of the tap part of the broken wire extractor (3) is opposite to the thread of the inner wall of the borehole (2); S3. Wedging the tap part of the broken wire extractor (3) into the drilled hole (2). The wedging depth of the tap part of the broken wire extractor (3) into the drilled hole (2) is H, and the drilling depth H0 is ensured to be greater than the sum of the wedging depth H of the broken wire extractor (3) and the reserved fitting depth h.

2. A method for removing a corroded screw according to claim 2, characterized in that: The calculation formula for the drilling diameter D is: D = dp; Where d is the diameter of the corroded screw and p is the pitch of the corroded screw.

3. A method for removing a corroded screw according to claim 2, characterized in that: The drilling diameter D is the maximum drilling diameter, and the calculation formula for the actual drilling diameter Dactual is: Dactual=D*{1-(25%~40%)}.

4. A method for removing a corroded screw according to claim 1, characterized in that: In step S3, a steel hammer is used to knock the tap part of the broken wire extractor (3) into the inside of the drill hole (2) and initially engage with the thread of the inner wall of the drill hole (2). Then, a wrench is used to twist the broken wire extractor (3) to wedge the tap part of the broken wire extractor (3) into the drill hole (2).

5. A method for removing a corroded screw according to claim 1, characterized in that: The calculation formula of the wedging depth H of the broken wire extractor (3) is: Wherein, K is the slope of the broken wire extractor, D1 is the handle diameter of the broken wire extractor, D2 is the head diameter of the broken wire extractor, H2 is the thread height of the tap part of the broken wire extractor, H3 is the projection length of the tap thread in the direction perpendicular to the thread axis, H is the wedging depth, and D is the drill hole diameter.

6. A method for removing a corroded screw according to claim 5, characterized in that: A torque sensor is installed on the handle of the broken wire extractor (3).

7. A method for removing a corroded screw according to claim 5, characterized in that: The handle of the broken wire extractor (3) is equipped with a displacement sensor.

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