Fastening screw and mounting tool thereof

Abstract

The invention discloses a fastening screw and a mounting tool thereof. The technical problem that the locking and retaining effects of the fastening screw are poor is solved. The fastening screw comprises a nut part and a screw rod part, a plurality of arc-shaped locking pieces are integrally formed at the bottom of the screw rod part, the concave faces of the multiple locking pieces are oppositely arranged, the multiple locking pieces are arranged in the circumferential direction of the screw rod part at equal intervals, and the bottoms of the multiple locking pieces can be expanded outwards under the action of an external tool. And the plurality of locking sheets are respectively and tightly propped against the step surface in the step hole of the lower part, so that the retaining and locking of the fastening screw are realized. The installation tool comprises a supporting frame, a supporting hole, a wrenching screw, a wrenching sleeve, a bearing hole, a pushing screw and the like and is used for achieving installation of the fastening screw. According to the fastening screw, the locking and anti-falling effects of the fastening screw can be improved, so that the fastening screw can adapt to a high-load and strong-vibration working environment, and the connection stability between equipment is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of fasteners, and particularly relates to a fastening screw and an installation tool therefor. Background Art

[0002] A fastening screw is a type of fastener, which is divided into a pointed fastening screw and a flat-headed fastening screw. Since the front end of the pointed fastening screw has a pointed structure and a relatively large pitch, it is generally used for fastening wooden parts and plastic parts. Since the pitch of the flat-headed fastening screw is small and uniform, it is generally used for fastening metals and machine parts.

[0003] Nowadays, in the fields of oil logging, aerospace, etc., different working environments and installation positions have different requirements for fastening screws. Some require fasteners to have high tensile performance, some require fasteners to have high fatigue resistance, and some require fasteners to have excellent anti-loosening performance. These different performance requirements place high demands on the structural form and dimensional accuracy of fasteners.

[0004] Currently, flat-headed fastening screws are usually used to connect the various components of oil logging and aerospace equipment. That is, stepped holes are respectively provided in the upper component and the lower component of the equipment, and fastening threads that cooperate with the fastening screw are provided in the stepped hole of the lower component. The fastening screw is passed through the stepped hole of the upper component and screwed into the stepped hole of the lower component, thereby realizing the connection between the upper component and the lower component of the equipment.

[0005] However, the locking and anti-detachment effects of the fastening screws in the related art are relatively poor. Especially when the instrument is in a working environment with high load and strong vibration, the fastening screws are prone to loosening problems, thus affecting the connection stability between the equipment, and there is room for improvement. Summary of the Invention

[0006] In order to solve all or part of the above problems, the purpose of the present invention is to provide a fastening screw and an installation tool therefor, which can improve the locking and anti-detachment effects of the fastening screw, enable the fastening screw to adapt to the working environment with high load and strong vibration, and ensure the connection stability between the equipment.

[0007] In a first aspect, the present invention provides a fastening screw, including a nut portion and a screw rod portion. A plurality of arc-shaped locking pieces are integrally formed at the bottom of the screw rod portion. The concave surfaces of the plurality of locking pieces are arranged opposite to each other, and the plurality of locking pieces are arranged at equal intervals along the circumferential direction of the screw rod portion. The bottoms of the plurality of locking pieces can be outwardly expanded under the action of an external tool, and the plurality of locking pieces are respectively in close contact with the stepped surfaces in the stepped hole of the lower component, so as to realize the anti-retreat locking of the fastening screw.

[0008] Optionally, bending notches are respectively provided at the top positions of the outer side walls of each of the locking pieces, so that the locking pieces can smoothly undergo plastic bending deformation along the corresponding bending notches.

[0009] Optionally, guiding inclined surfaces are respectively provided at the bottom positions of the inner side walls of each of the locking pieces, so that an external tool can be smoothly inserted between the plurality of locking pieces.

[0010] Optionally, the nut portion includes a corner head portion and a flange portion. The corner head portion is integrally formed at the top of the flange portion. The flange portion is integrally formed at the top of the screw portion. The outer diameter of the flange portion is greater than the outer diameter of the corner head portion, and the lower surface of the flange portion can be in close contact with the step surface in the step hole of the upper component.

[0011] Optionally, the corner head portion is a twelve-sided head.

[0012] Optionally, the spreading angle of the locking piece is 45° - 55°.

[0013] In a second aspect, the present invention provides an installation tool for installing a fastening screw. The installation tool includes:

[0014] A support frame, having a C-shaped structure and for a worker to hold;

[0015] A support hole, provided at the upper end of the support frame;

[0016] A wrenching screw, threadedly connected in the support hole;

[0017] A wrenching sleeve, coaxially provided at the bottom of the wrenching screw and capable of tightly sleeving on the nut portion;

[0018] A receiving hole, provided at the lower end of the support frame;

[0019] A pushing screw, threadedly connected in the receiving hole;

[0020] The pushing screw is located directly below the wrenching sleeve and is coaxial with the wrenching sleeve. The top of the pushing screw can be inserted between the plurality of locking pieces and cause the bottoms of the plurality of locking pieces to spread outwards.

[0021] Optionally, a twelve-sided groove is provided on the inner side wall of the wrenching sleeve, and the twelve-sided groove is matched with the twelve-sided head.

[0022] Optionally, inner hexagonal control grooves for cooperating with a hexagonal wrench are respectively provided on the nuts of the wrenching screw and the pushing screw.

[0023] Optionally, a conical pushing surface is provided at the top of the pushing screw, so that the top of the pushing screw can be smoothly inserted between the plurality of locking pieces, and the plurality of locking pieces can be smoothly expanded.

[0024] Optionally, a positioning sleeve is threadedly sleeved on the screw rod of the pushing screw. When the upper surface of the positioning sleeve abuts against the bottom of the support frame, the plurality of locking pieces are respectively expanded and tightly abut against the step surfaces in the step holes of the lower component.

[0025] As can be seen from the above technical solutions, the fastening screw and its installation tool provided by the present invention have the following advantages:

[0026] The fastening screw can improve the locking and anti-loosening effects, so that the fastening screw can adapt to the working environment of high load and strong vibration to ensure the connection stability between devices. The installation tool can realize the rapid and convenient installation of the fastening screw, which can not only improve the operation convenience but also improve the operation efficiency.

[0027] Other features and advantages of the present invention will be described in the subsequent specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solutions of the present invention and do not constitute a limitation to the technical solutions of the present invention.

[0029] Figure 1 It is a schematic structural diagram of the fastening screw in Embodiment 1 of the present invention;

[0030] Figure 2 It is a schematic diagram of the usage state of the fastening screw in Embodiment 1 of the present invention;

[0031] Figure 3 It is a cross-sectional view of the installation tool in Embodiment 2 of the present invention.

[0032] Description of the reference numerals:

[0033] 1, nut part; 101, angular head part; 102, flange part; 2, screw rod part; 3, locking piece; 4, bending notch; 5, guiding inclined surface; 6, support frame; 7, support hole; 8, wrenching screw; 9, wrenching sleeve; 10, receiving hole; 11, pushing screw; 12, twelve-angle groove; 13, internal hexagonal control groove; 14, pushing surface; 15, positioning sleeve; 16, limiting block; 17, limiting groove;

[0034] 100, upper component; 200, lower component; 300, step hole; 400, step surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be arbitrarily combined with each other.

[0036] Embodiment 1

[0037] As Figure 1 、 Figure 2 shown in Embodiment 1 of the present invention, a fastening screw is disclosed in this embodiment, which includes a nut portion 1 and a screw rod portion 2, and the nut portion 1 is integrally formed and connected to the top of the screw rod portion 2. A plurality of arc-shaped locking pieces 3 are integrally formed at the bottom of the screw rod portion 2, the concave surfaces of the plurality of locking pieces 3 are arranged opposite to each other, and the plurality of locking pieces 3 are arranged at equal intervals along the circumferential direction of the screw rod portion 2.

[0038] When the fastening screw is threadedly connected to the device and an external tool is inserted between the plurality of locking pieces 3, the bottoms of the plurality of locking pieces 3 can be expanded outwards under the action of the external tool, and the plurality of locking pieces 3 are respectively in close contact with the step surfaces 400 in the step holes 300 of the lower component 200, so as to realize the anti-rotation locking of the fastening screw.

[0039] In the fastening screw of this embodiment, the expandable locking pieces 3 are used to realize the abutting fit with the step surfaces 400 in the step holes 300 of the lower component 200, so as to realize good axial limitation of the fastening screw, effectively improve the locking and anti-loosening effects of the fastening screw, enable the fastening screw to adapt to high-load and strong-vibration working environments, and ensure the connection stability between devices.

[0040] In one embodiment, as Figure 1 、 Figure 2 shown, bending notches 4 are respectively arranged at the top positions of the outer side walls of each locking piece 3 to achieve a good guiding effect, so that the locking piece 3 can smoothly undergo plastic bending deformation along the corresponding bending notches 4, thereby ensuring the smooth installation of the fastening screw.

[0041] In one embodiment, as Figure 1 、 Figure 2 shown, guiding inclined surfaces 5 are respectively integrally formed at the bottom positions of the inner side walls of each locking piece 3, and the bottoms of the inner side walls of the plurality of locking plates are flared, so that an external tool can be smoothly inserted between the plurality of locking pieces 3 to realize the smooth installation of the fastening screw.

[0042] In one embodiment, as Figure 1 、 Figure 2As shown in the figure, the nut portion 1 includes a hexagonal head portion 101 and a flange portion 102. The hexagonal head portion 101 is a twelve-sided head, and the hexagonal head portion 101 is integrally formed on the top of the flange portion 102. The flange portion 102 is integrally formed on the top of the screw portion 2. The outer diameter of the flange portion 102 is greater than the outer diameter of the hexagonal head portion 101, and the lower surface of the flange portion 102 can be in close contact with the step surface 400 in the step hole 300 of the upper component 100.

[0043] By adopting the twelve-sided head hexagonal head portion 101, compared with the ordinary hexagonal head, its across-flat size is smaller, which can not only reduce the weight but also save the installation space, and is more suitable for the installation environment with a narrow assembly space. Moreover, compared with the ordinary hexagonal head, its wrenching ability is higher. By setting the flange portion 102, the contact area between the fastening screw and the upper component 100 is increased, which can not only improve the force condition between the upper component 100 and the lower component 200, but also improve the anti-loosening ability of the fastening screw.

[0044] In one embodiment, as Figure 1 、 Figure 2 shown, the thread type of the screw portion 2 is a common thread, and the thread tolerance zone is 5g6g. In addition, the screw portion 2 belongs to a long thread structure, so that the fastening screw can bear a large tensile force to improve the performance of the fastening screw.

[0045] In one embodiment, as Figure 1 、 Figure 2 shown, the spreading angle of the locking piece 3 is 45° - 55°. In this embodiment, the spreading angle of the locking piece 3 is selected as 50° to ensure the tightening effect between the locking piece 3 and the lower component 200, thereby ensuring the locking stability of the fastening screw.

[0046] Embodiment 2

[0047] As Figure 3 shown in the figure is Embodiment 2 of the present invention. In this embodiment, an installation tool for installing the fastening screw in Embodiment 1 is disclosed. The installation tool includes a support frame 6, and the support frame 6 is in a C-shaped structure and is for a worker to hold. A support hole 7 is provided at the upper end of the support frame 6, and a receiving hole 10 is provided at the lower end. The axes of the support hole 7 and the receiving hole 10 are respectively vertical. The receiving hole 10 is located directly below the support hole 7, and the receiving hole 10 and the support hole 7 are coaxial.

[0048] In one embodiment, as Figure 3 shown, a wrenching screw 8 is threadedly connected in the support hole 7. A wrenching sleeve 9 is coaxially provided at the bottom of the wrenching screw 8. A twelve-sided groove 12 is provided on the inner side wall of the wrenching sleeve 9 so that the wrenching sleeve 9 can be closely sleeved on the hexagonal head portion 101.

[0049] In one embodiment, as Figure 3As shown, the receiving hole 10 is internally threaded with a push screw 11, which is located directly below the wrench sleeve 9 and coaxial with the wrench sleeve 9. When the push screw 11 is rotated and moved upward, the top of the push screw 11 can be inserted between the multiple locking plates 3, and the bottoms of the multiple locking plates 3 are stretched outward.

[0050] In one embodiment, Figure 3 As shown, the nuts of the wrenching screw 8 and the pushing screw 11 are respectively provided with hexagonal control grooves 13, so that the wrenching screw 8 and the pushing screw 11 can be used in conjunction with a hexagonal wrench, so as to facilitate the staff to quickly rotate the wrenching screw 8 and the pushing screw 11 and improve the convenience of operation.

[0051] In one embodiment, Figure 3 As shown, a conical pushing surface 14 is provided at the top of the pushing screw 11 to improve the guiding effect, so that the top of the pushing screw 11 can be smoothly inserted between the multiple locking plates 3 and the multiple locking plates 3 can be smoothly spread open.

[0052] In one embodiment, Figure 3 As shown, a positioning sleeve 15 is threadedly sleeved on the screw rod of the jacking screw 11 to limit the maximum screwing length of the jacking screw 11. The staff can adjust the position of the positioning sleeve 15 according to actual needs to ensure that when the upper surface of the positioning sleeve 15 abuts against the bottom of the support frame 6, the multiple locking plates 3 are respectively opened and tightly abut against the step surface 400 in the step hole 300 of the lower component 200, thereby providing a good reminder to the staff to prevent the staff from over-screwing the jacking screw 11, thereby reducing the risk of damage to the fastening screw.

[0053] In one embodiment, Figure 3 As shown, the bottom of the wrench screw 8 is integrally formed with a rectangular limit block 16, and the top of the wrench sleeve 9 is provided with a rectangular limit groove 17, and the limit block 16 can be tightly inserted into the limit groove 17. At the same time, the wrench sleeve 9 is screwed with a locking screw (not shown in the figure) that can press against the limit block 16 to achieve the connection between the wrench screw 8 and the wrench sleeve 9. This design allows the wrench sleeve 9 to be disassembled and replaced, and the staff can select the wrench sleeve 9 that matches it according to the shape of the nut portion 1 of the fastening screw, thereby improving the adaptability of the installation tool.

[0054] The installation process of the installation tool for the fastening screws in this embodiment is as follows:

[0055] Pass the fastening screw through the stepped hole 300 of the upper part 100, and rotate the fastening screw through the external sleeve so that the screw part 2 of the fastening screw is tightened in the stepped hole 300 of the lower part 200. Subsequently, control the wrench screw 8 with a hexagon wrench to drive the wrench sleeve 9 to rotate, so that the wrench screw 8 and the wrench sleeve 9 move downward until the wrench sleeve 9 moves to a preset position. Then, pull the support frame 6 downward and make the wrench sleeve 9 tightly sleeved on the angular head 101 of the fastening screw. Immediately afterwards, adjust the position of the limit sleeve as needed, and then control the push screw 11 to rotate with a hexagon wrench. During the upward movement of the push screw 11, the top of the push screw 11 is inserted into the plurality of locking pieces 3, and the bottoms of the plurality of locking pieces 3 are outwardly expanded under the action of the push screw 11. When the limit sleeve abuts against the support frame 6, the plurality of locking pieces 3 complete the expansion action, that is, the plurality of locking pieces 3 are respectively in close contact with the stepped surface 400 in the stepped hole 300 of the lower part 200, thereby completing the installation operation of the fastening screw. Subsequently, control the push screw 11 to rotate in the reverse direction with a hexagon wrench, pull the support frame 6 upward, and make the wrench sleeve 9 disengage from the stepped hole 300 of the upper part 100, and the disassembly of the installation tool can be realized.

[0056] As can be seen from the above process, using this installation tool can achieve the rapid and convenient installation of the fastening screw, which can not only improve the operation efficiency but also reduce the burden on the staff.

[0057] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those skilled in the art to which the present invention belongs.

[0058] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically defined.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fastening screw, comprising a nut portion (1) and a screw rod portion (2), characterized in that, A plurality of arc-shaped locking pieces (3) are integrally formed at the bottom of the screw part (2). The concave surfaces of the plurality of locking pieces (3) are arranged oppositely, and the plurality of locking pieces (3) are arranged at equal intervals along the circumferential direction of the screw part (2). The bottoms of the plurality of locking pieces (3) can be expanded outwards under the action of an external tool, and the plurality of locking pieces (3) are respectively in close contact with the step surfaces in the step holes of the lower part, so as to realize the anti-loosening locking of the fastening screw.

2. The fastening screw according to claim 1, characterized in that, Bending notches (4) are respectively arranged at the top positions of the outer side walls of each locking piece (3), so that the locking piece (3) can smoothly undergo plastic bending deformation along the corresponding bending notch (4).

3. The fastening screw according to claim 1, characterized in that, Guide inclined surfaces (5) are respectively arranged at the bottom positions of the inner side walls of each locking piece (3), so that an external tool can be smoothly inserted between the plurality of locking pieces (3).

4. The fastening screw according to claim 1, characterized in that, The nut part (1) includes a corner head part (101) and a flange part (102). The corner head part (101) is integrally formed on the top of the flange part (102). The flange part (102) is integrally formed on the top of the screw part (2). The outer diameter of the flange part (102) is larger than the outer diameter of the corner head part (101), and the lower surface of the flange part (102) can be in close contact with the step surface in the step hole of the upper part.

5. The fastening screw according to claim 4, characterized in that, The corner head part (101) adopts a twelve-sided head.

6. The fastening screw according to claim 1, wherein, The expansion angle of the locking piece (3) is 45° - 55°.

7. An installation tool for installing the fastening screw according to any one of claims 1-6, characterized in that, The installation tool includes: A support frame (6), having a C-shaped structure and for a worker to hold; A support hole (7) arranged at the upper end of the support frame (6); A wrenching screw (8) threadedly connected in the support hole (7); A wrenching sleeve (9) coaxially arranged at the bottom of the wrenching screw (8) and capable of tightly sleeving on the nut part (1); A receiving hole (10) arranged at the lower end of the support frame (6); A pushing screw (11) threadedly connected in the receiving hole (10); The pushing screw (11) is located directly below the wrenching sleeve (9) and is coaxial with the wrenching sleeve (9). The top of the pushing screw (11) can be inserted between the plurality of locking pieces (3), and the bottoms of the plurality of locking pieces (3) are expanded outwards.

8. The installation tool according to claim 7, characterized in that, Inner hexagonal control grooves (13) for cooperating with a hexagonal wrench are respectively arranged on the nuts of the wrenching screw (8) and the pushing screw (11).

9. The installation tool according to claim 7, characterized in that The top of the pushing screw (11) is provided with a conical pushing surface (14), so that the top of the pushing screw (11) can be smoothly inserted between the plurality of locking pieces (3), and the plurality of locking pieces (3) are smoothly expanded.

10. The installation tool according to claim 7, characterized in that, A positioning sleeve (15) is threadedly sleeved on the screw of the pushing screw (11). When the upper surface of the positioning sleeve (15) abuts against the bottom of the support frame (6), the plurality of locking pieces (3) are respectively expanded and are respectively in close contact with the step surfaces in the step holes of the lower part.

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