CN111550484A - Countersunk screw with controllable pretightening force and disassembling method thereof - Google Patents
Countersunk screw with controllable pretightening force and disassembling method thereof Download PDFInfo
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- CN111550484A CN111550484A CN202010279492.8A CN202010279492A CN111550484A CN 111550484 A CN111550484 A CN 111550484A CN 202010279492 A CN202010279492 A CN 202010279492A CN 111550484 A CN111550484 A CN 111550484A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000010079 rubber tapping Methods 0.000 claims abstract description 6
- 230000036316 preload Effects 0.000 claims 4
- 230000009286 beneficial effect Effects 0.000 description 7
- 208000010392 Bone Fractures Diseases 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
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Abstract
The invention relates to a countersunk screw with controllable pretightening force and a disassembling method thereof, belonging to the technical field of fasteners. The countersunk head screw comprises a working part, a process part and a dismounting hole, wherein the working part comprises a screw head and a screw rod, the screw rod is provided with a fastening thread, the process part comprises a pulling section and a neck breaking section, the neck breaking section is positioned between the pulling section and the working part so as to form a neck breaking groove on the countersunk head screw, the dismounting hole axially penetrates through the process part along the countersunk head screw and enters the working part, the dismounting hole is a dismounting threaded hole or a unthreaded hole, the unthreaded hole is used for tapping when the countersunk head screw is dismounted so as to form a dismounting threaded hole, the screwing direction of the dismounting threaded hole is opposite to the screwing direction of the fastening thread of the screw rod, and the dismounting screw is used for screwing the dismounting screw so as to dismount the countersunk head screw. The countersunk head screw can be applied to the use working condition that the surface of the connected piece is required to be flat, and after the countersunk head screw is used, the countersunk head screw can be detached, so that the use is more convenient.
Description
Technical Field
The invention belongs to the technical field of fasteners, and particularly relates to a countersunk screw with controllable pretightening force and a disassembling method thereof.
Background
At present, when bolts and screws are installed in China, manual tightening is mostly adopted, but the tightening precision of the manual tightening is only about +/-60% even by experienced workers, so that the bolts and the screws are easily over-tightened or under-tightened, and the bolts and the screws are broken or cannot be fastened.
In order to solve the above problems, the prior art generally adopts a bolt and a nut with controllable pretightening force, for example, chinese patent application with application publication No. CN104265747A and application date 2014.09.15 discloses a light bolt connector with rated pretightening force and a processing method thereof, a hexagonal wrenching surface of the bolt connector is provided with a twist-off groove, a bolt head is provided with a lightening hole for lightening the weight of the bolt, when a mounting bolt is twisted, as long as the rated pretightening force is reached, the bolt connector is disconnected from the twist-off groove, a structure positioned at the upper part of the twist-off groove can automatically fall off, the pretightening force is controlled to a proper value, and the weight of the bolt is further lightened.
However, after the bolt is installed, the bolt head partially protrudes out of the surface of the connected piece, and the bolt is not suitable for the use condition that the surface of the connected piece is required to be flat, so that a countersunk head screw with controllable pretightening force needs to be designed.
Disclosure of Invention
The invention aims to provide a countersunk head screw with controllable pretightening force, which is applied to the use working condition that the surface of a connected piece is required to be smooth, and also provides a method for disassembling the countersunk head screw with controllable pretightening force.
The countersunk head screw with controllable pretightening force adopts the following technical scheme:
a countersunk-head screw with controllable pre-tightening force, comprising:
a working portion including a screw head and a screw shaft having a fastening thread;
the process part comprises a wrenching section and a neck breaking section, wherein the neck breaking section is positioned between the wrenching section and the working part so as to form a neck breaking groove on the countersunk head screw;
the dismounting hole penetrates through the process part along the axial direction of the countersunk head screw and enters the working part;
the dismounting holes are dismounting threaded holes; or the disassembly hole is a unthreaded hole which is used for tapping when the countersunk head screw is disassembled to form a disassembly threaded hole;
the screw thread turning direction of the dismounting screw hole is opposite to the fastening screw thread turning direction of the screw rod and is used for screwing the dismounting screw to dismount the countersunk head screw.
The invention has the technical effects that: the invention relates to a countersunk head screw with controllable pretightening force, which comprises a process part, a working part and a dismounting hole, wherein the process part comprises a wrenching section and a broken neck section, when the countersunk head screw is screwed into a connected surface by using a wrenching tool, if the acting force of the countersunk head screw is not less than the rated pretightening force, the broken neck section is broken to separate the process part from the working part, the problem that the screw is too screwed or the screwing force is too small, and the screw is not broken or the fastening purpose cannot be achieved is solved, when the countersunk head screw needs to be dismounted, if the dismounting hole is a smooth hole, tapping is needed to be carried out firstly, the screwing direction of the thread formed by tapping is opposite to the screwing direction of the fastening thread of a screw rod, then a left-handed screw is screwed to be used as a dismounting screw, the countersunk head screw can be screwed out from the surface of a connected piece by screwing the dismounting screw, if the dismounting hole is a threaded hole, the, the sunk screw can be screwed out by screwing and disassembling the screw. The countersunk head screw can be applied to the use working condition that the surface of the connected piece is required to be flat, and after the countersunk head screw is used, the countersunk head screw can be detached, so that the use is more convenient.
Further, the dismounting hole is a blind hole.
The beneficial effects are that: the dismounting hole is set to be the blind hole, so that the dismounting hole does not need to penetrate through the whole countersunk head screw, the structural strength of the countersunk head screw is improved, and the risk of fracture of the countersunk head screw due to insufficient structural strength is reduced.
Further, the bottom of the blind hole is located at the screw head.
The beneficial effects are that: the bottom of the blind hole is arranged at the head of the screw, so that the screw rod is solid and has higher structural strength.
Further, the cross section of the wrenching section is larger than that of the neck-breaking section to form a step.
The beneficial effects are that: the cross section of the wrenching section is larger than that of the neck breaking section, so that the wrenching section is easier to clamp and turn by a wrenching tool.
Furthermore, the neck breaking section is of a round table structure, and the small-diameter end of the neck breaking section is close to the working part.
The beneficial effects are that: the cross section of the neck-breaking section is gradually reduced from the process part to the working part, and the structural strength of the neck-breaking section is lowest at the position close to the working part, so that the neck-breaking section is easy to break, and the neck-breaking section cannot protrude from the surface of a connected piece after being broken.
Further, the dismounting hole is a cylindrical hole.
The beneficial effects are that: the cylindrical hole can conveniently tap and conveniently dismantle and screw to twist into countersunk screw in.
The technical scheme of the method for disassembling the countersunk head screw with the controllable pretightening force is as follows:
a method for disassembling a countersunk head screw with controllable pretightening force includes screwing a disassembling screw into a disassembling hole of the countersunk head screw, driving the countersunk head screw to be reversely loosened by the disassembling screw in a screwing direction opposite to a screwing direction of fastening threads of the countersunk head screw, and realizing disassembly.
The invention has the beneficial effects that: according to the dismounting method of the countersunk head screw with the controllable pretightening force, the dismounting screw with the screwing direction opposite to that of the countersunk head screw is screwed into the dismounting hole, and the countersunk head screw is dismounted by using the dismounting screw, so that the method is simple and convenient.
Further, the dismounting hole of the countersunk head screw is a smooth hole, and before the dismounting screw is screwed, a dismounting thread is processed in the smooth hole, and the dismounting thread is screwed in the opposite direction to the fastening thread of the countersunk head screw.
The beneficial effects are that: the countersunk head screw with the disassembly hole being the unthreaded hole can also be disassembled.
Drawings
FIG. 1 is a schematic structural view of a countersunk head screw with controllable pre-tightening force according to the invention;
FIG. 2 is a front view of the countersunk-head screw of FIG. 1;
FIG. 3 is a bottom view of the countersunk-head screw of FIG. 2;
FIG. 4 is a schematic view of the countersunk-head screw of FIG. 1 with the process and working parts separated;
fig. 5 is a schematic structural view of the countersunk-head screw of fig. 4 when detached.
1-a working part; 11-screw head; 12-a screw shaft; 2-process part; 21-wrenching and twisting section; 22-neck breaking section; 3-connected piece; 4-disassembling the hole; 5-disassembling the screw.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the recitation of "comprising an … …" may occur without the exclusion of additional like elements present in the process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
Example 1 of a countersunk-head screw with controllable pretension according to the invention:
as shown in fig. 1, the countersunk head screw with controllable pretightening force of the present invention includes a working part 1 and a process part 2.
As shown in fig. 2 and 3, the working part 1 includes a screw head 11 and a screw rod 12, the screw rod 12 is provided with a fastening thread, the fastening thread is a right-handed thread, the screw head 11 is in an inverted truncated cone shape, and the screw head 11 sinks into the surface of the connected piece 3 in use.
As shown in fig. 1 and 3, the process portion 2 includes a wrenching section 21 and a neck-breaking section 22, the wrenching section 21 is a hexagonal head, and the outer hexagonal surface of the hexagonal head is used as a wrenching surface which can be screwed by a wrench to screw a countersunk head screw into a predetermined position. A breakneck section 22 is provided between the wrenching section 21 and the working portion 1 to form a breakneck groove in the countersunk-head screw. To facilitate wrench turning, the cross-section of the wrenching section 21 is larger than the cross-section of the neck section 22 to form a step.
According to the maximum pre-tightening force which can be borne by the neck-breaking section 22, the maximum pre-tightening force is set as the rated pre-tightening force of the countersunk head screw. As shown in fig. 4, when the wrenching section 21 of the countersunk head screw is turned by a wrench, if the pretightening force applied to the countersunk head screw is not less than the rated pretightening force, the neck-breaking section 22 will break, so that the process part 1 and the working part 2 are separated, and the problem that the screw breaks or cannot be fastened due to over-tightening or too low tightening force is not easy to occur. In the present embodiment, in order to make the fracture point of the broken neck section 22 just flush with the upper end face of the screw head 11, the broken neck section 22 is configured to be a circular truncated cone structure, and the small diameter end of the broken neck section 22 is close to the working portion 1.
As shown in fig. 1, in order to facilitate the removal of the countersunk-head screw, a removal hole 4 is provided in the countersunk-head screw, and the removal hole 4 penetrates the process part 2 in the axial direction of the countersunk-head screw and enters the working part 1. In the present embodiment, the dismounting hole 4 is a cylindrical unthreaded hole and is a blind hole with a hole bottom located at the screw head 11. When it is desired to remove an already installed countersunk head screw, as shown in fig. 5, it is only necessary to tap a left-handed screw tap at the unthreaded hole of the screw head 11 and form a left-handed removal threaded hole, then screw in a left-handed screw as the removal screw 5, and then unscrew the countersunk head screw from the surface of the to-be-connected member 3 by screwing the removal screw 5. Since the removal hole 4 is processed by cutting away the material, the removal hole 4 also has a function of reducing the weight of the countersunk screw.
The invention is used as follows:
firstly, a screw rod 12 of a countersunk head screw is screwed into the matched internal threads to be left and right buckled in the connecting piece 3, then a hexagonal head of the process part 2 is clamped by using a hexagonal wrench, then the hexagonal wrench is screwed to completely screw the countersunk head screw into the connected piece 3, after the hexagonal wrench is completely screwed, a certain torque is continuously applied to the hexagonal wrench, so that a broken neck section 22 of the process part 2 is broken due to the acting force exceeding the rated pretightening force, at the moment, the process part 2 is separated from the working part 1, a dismounting hole 4 is still reserved on a screw head 11 of the working part 1, and at the moment, the mounting process of the countersunk head screw is completed.
When the countersunk head screw needs to be disassembled, the disassembly hole 4 on the screw head 11 is tapped by using a left-handed screw tap to form a left-handed disassembly threaded hole, then the left-handed disassembly screw 5 is screwed in, and then the disassembly screw 5 is screwed to unscrew the countersunk head screw from the surface of the connected piece 3.
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in example 1, the removal hole is a smooth hole, and when the countersunk head screw needs to be removed, a left-handed thread having a direction opposite to that of the fastening thread on the screw shank is further processed in the smooth hole to form a removal threaded hole. When the mounted countersunk head screw needs to be disassembled, only a left-handed screw needs to be screwed in, and then the countersunk head screw can be screwed out from the surface of the connected piece by screwing the left-handed screw.
Example 3 of a countersunk-head screw with controllable pretension according to the invention:
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in the embodiment 1, the dismounting hole is a blind hole with a hole bottom located at the screw head, and in the embodiment, the dismounting hole is a blind hole with a hole bottom located at the screw rod.
Example 4 of a countersunk-head screw with controllable pretension according to the invention:
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in the embodiment 1, the dismounting hole is a blind hole, and in the embodiment, the dismounting hole is a through hole.
Example 5 of a countersunk-head screw with controllable pretension according to the invention:
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in the embodiment 1, the removal hole is a cylindrical hole, and in the embodiment, the removal hole is a conical hole.
Example 6 of a countersunk-head screw with controllable pretension according to the invention:
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in embodiment 1, the cross section of the wrenching section is larger than that of the neck section to form a step, and in this embodiment, the cross section of the wrenching section is smaller than that of the neck section to form a step. In other embodiments, the cross-section of the wrenching section is the same size as the cross-section of the neck section.
Example 7 of a countersunk-head screw with controllable pretension according to the invention:
the countersunk-head screw with controllable pretension force in this embodiment differs from the countersunk-head screw with controllable pretension force in embodiment 1 only in that: in embodiment 1, the neck-breaking section is an inverted truncated cone shape with a large top and a small bottom, in this embodiment, an annular groove is provided on the upper end surface of the screw head, the neck-breaking section is a three-stage cylindrical section with a large top and a small bottom, and the outer peripheral surface of the third-stage cylindrical section with the smallest diameter is the inner wall surface of the annular groove.
The embodiment of the method for disassembling the countersunk head screw with the controllable pretightening force comprises the following steps:
when the countersunk head screw needs to be disassembled, the disassembling screw is screwed into the disassembling hole of the countersunk head screw, the screwing direction of the disassembling screw is opposite to the screwing direction of the fastening thread of the countersunk head screw, and the countersunk head screw is driven to be reversely loosened through the disassembling screw so as to realize disassembly.
In this embodiment, the dismounting hole is a dismounting threaded hole, so that the dismounting screw can be directly screwed into the hole, and since the screwing direction of the dismounting screw is opposite to the screwing direction of the fastening thread of the countersunk screw, when force is applied in the direction of screwing the dismounting screw, the countersunk screw can be driven to rotate reversely, and the dismounting screw is loosened from the corresponding fastening mounting hole, so that the screw dismounting is realized.
Because the screwing direction of the disassembly thread is opposite to that of the fastening thread, when the disassembly screw is screwed in the disassembly direction, the disassembly screw and the countersunk head screw can be always fastened and assembled together, and the disassembly acting force is ensured.
In addition, in the present embodiment, the removal hole is a removal threaded hole having a removal thread. In other embodiments, the disassembly hole may be configured as a smooth hole, and in this case, the smooth hole needs to be tapped first, the disassembly thread is processed, attention is paid to make the screwing direction of the disassembly thread formed by tapping opposite to the screwing direction of the fastening thread of the screw rod, then the disassembly screw is screwed into the tapped smooth hole, and then the disassembly screw is screwed continuously to take out the countersunk head screw screwed into the surface of the connected member.
According to the dismounting method provided by the invention, the dismounting hole is formed in the countersunk head screw, the dismounting screw is screwed in the hole during dismounting, the dismounting operation of the countersunk head screw is realized under the condition that the external space is not occupied, and the dismounting method is suitable for being applied to the mounting occasion of the countersunk head screw and is convenient to apply.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (8)
1. A countersunk-head screw with controllable pre-tightening force, comprising:
a working portion including a screw head and a screw shaft having a fastening thread;
the process part comprises a wrenching section and a neck breaking section, wherein the neck breaking section is positioned between the wrenching section and the working part so as to form a neck breaking groove on the countersunk head screw;
the method is characterized in that:
the dismounting hole penetrates through the process part along the axial direction of the countersunk head screw and enters the working part;
the dismounting holes are dismounting threaded holes; or the disassembly hole is a unthreaded hole which is used for tapping when the countersunk head screw is disassembled to form a disassembly threaded hole;
the screw thread turning direction of the dismounting screw hole is opposite to the fastening screw thread turning direction of the screw rod and is used for screwing the dismounting screw to dismount the countersunk head screw.
2. The countersunk-head screw with controllable preload force as claimed in claim 1, wherein the dismounting hole is a blind hole.
3. The countersunk-head screw with controllable preload force according to claim 2, characterized in that the bottom of the blind hole is located at the screw head.
4. The countersunk-head screw with controllable preload force as claimed in claim 1, 2 or 3, wherein the cross section of the wrenching section is larger than that of the neck-breaking section to form a step.
5. The countersunk head screw with controllable pretightening force according to claim 1, 2 or 3, wherein the broken neck section is of a circular truncated cone structure, and the small-diameter end of the broken neck section is close to the working part.
6. The countersunk-head screw with controllable preload force as claimed in claim 1, 2 or 3, wherein the dismounting hole is a cylindrical hole.
7. A method for disassembling a countersunk head screw with controllable pretightening force is characterized in that the disassembling screw is screwed into a disassembling hole of the countersunk head screw, the screwing direction of the disassembling screw is opposite to the screwing direction of a fastening thread of the countersunk head screw, and the countersunk head screw is driven to be reversely loosened through the disassembling screw so as to realize the disassembling.
8. The method of claim 7, wherein the removal hole of the countersunk-head screw is a smooth hole, and a removal thread is processed in the smooth hole before the removal screw is screwed, wherein the removal thread is opposite to the tightening thread of the countersunk-head screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010279492.8A CN111550484A (en) | 2020-04-10 | 2020-04-10 | Countersunk screw with controllable pretightening force and disassembling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010279492.8A CN111550484A (en) | 2020-04-10 | 2020-04-10 | Countersunk screw with controllable pretightening force and disassembling method thereof |
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| CN111550484A true CN111550484A (en) | 2020-08-18 |
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| CN202010279492.8A Pending CN111550484A (en) | 2020-04-10 | 2020-04-10 | Countersunk screw with controllable pretightening force and disassembling method thereof |
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| CN202707746U (en) * | 2012-06-14 | 2013-01-30 | 河南中烟工业有限责任公司 | Structure for pulling out bolt without top |
| CN203822797U (en) * | 2014-05-21 | 2014-09-10 | 乐清市精华紧固件有限公司 | Anti-dismantle bolt |
| CN104265747A (en) * | 2014-09-15 | 2015-01-07 | 贵州航天精工制造有限公司 | Rated pretightening force light bolt connection piece and machining method thereof |
| RU2682807C1 (en) * | 2017-11-01 | 2019-03-21 | Публичное акционерное общество "ОДК - Уфимское моторостроительное производственное объединение" (ПАО "ОДК-УМПО") | Bolt for connecting parts |
| CN108361254A (en) * | 2018-02-28 | 2018-08-03 | 成都新力紧科技有限公司 | A kind of electromechanical installation hanger system of building |
| CN210095884U (en) * | 2019-03-29 | 2020-02-21 | 中南大学湘雅医院 | Bone screw bolt convenient to disassemble |
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Application publication date: 20200818 |
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