阅读说明：本技术 一种变径双螺纹长度可调节的自攻螺钉 (Self-tapping screw with adjustable reducing double-thread length ) 是由 张二韩 陈熔 曹路杰 任忠伟 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种变径双螺纹长度可调节的自攻螺钉,包括螺钉以及与螺钉可拆卸连接的调节螺扣,螺钉靠近头部的一端外壁上设置有固定长度的粗深螺纹,螺钉靠近尾部的一端外壁上设置有固定长度的细浅螺纹,粗深螺纹与细浅螺纹之间无缝接合,粗深螺纹与调节螺扣螺纹连接。采用此自攻螺钉在钢结构单层屋面用于固定保温层及防水层时,通过细浅螺纹和粗深螺纹的组合设计实现既能固定厚钢板也能固定薄钢板。螺钉靠近尾部的一端为固定长度的细浅螺纹,紧接着是固定长度的粗深螺纹,通过固定的螺纹长度拧进钢板时阻力停止,调节螺扣控制螺钉与套管之间的搭接长度实现压紧固定,拧入钢板深度一致,实现受力统一,有效解决了螺钉固定深度无法控制的问题。(The invention relates to a self-tapping screw with adjustable variable-diameter double-thread length, which comprises a screw and an adjusting screw thread detachably connected with the screw, wherein thick and deep threads with fixed lengths are arranged on the outer wall of one end, close to the head, of the screw, thin and shallow threads with fixed lengths are arranged on the outer wall of one end, close to the tail, of the screw, the thick and deep threads are in seamless joint with the thin and shallow threads, and the thick and deep threads are in threaded connection with the adjusting screw thread. When the self-tapping screw is used for fixing a heat-insulating layer and a waterproof layer on a steel structure single-layer roof, the combination design of thin and shallow threads and thick and deep threads is adopted to realize that both a thick steel plate and a thin steel plate can be fixed. The one end that the screw is close to the afterbody is the thin shallow screw thread of fixed length, is the thick dark screw thread of fixed length immediately, and resistance stops when screwing in the steel sheet through fixed thread length, adjusts the overlap joint length between thread tightening control screw and the sleeve pipe and realizes compressing tightly fixedly, and it is unanimous to twist the steel sheet degree of depth, realizes that the atress is unified, has effectively solved the uncontrollable problem of screw fixation degree of depth.)

1. The utility model provides a self-tapping screw with adjustable two screw thread lengths of reducing which characterized in that: including screw (1) and with screw (1) can dismantle regulation spiro union (2) of being connected, screw (1) is provided with thick dark screw thread (3) of fixed length on being close to the one end outer wall of head, screw (1) is provided with thin shallow screw thread (4) of fixed length on being close to the one end outer wall of afterbody, thick dark screw thread (3) with seamless joint between thin shallow screw thread (4), thick dark screw thread (3) with regulation spiro union (2) threaded connection.

2. A variable diameter double thread length adjustable self-tapping screw as in claim 1 wherein: the adjusting screw thread (2) is provided with a groove (21), the thick and deep threads (3) and the head are provided with a transition rod (5) which is fixedly connected with the screw (1) in an integrated mode, the adjusting screw thread (2) is installed on the transition rod (5), and the head is embedded in the groove (21).

3. A variable diameter double thread length adjustable self-tapping screw as in claim 2 wherein: an arc-shaped notch (22) for the transition rod (5) to be inserted is formed in the adjusting screw fastener (2).

4. A variable diameter double thread length adjustable self-tapping screw as in claim 1 wherein: the screw (1) is in the one end coaxial fixedly connected with one end of the thin and shallow thread (4) far away from the thick and deep thread (3) is a conical punching rod (6), and the outer wall of the punching rod (6) is smoothly arranged.

5. A variable diameter double thread length adjustable self-tapping screw as in claim 1 wherein: the screw (1) is made of carbon steel or stainless steel material.

6. A variable diameter double thread length adjustable self-tapping screw as in claim 1 wherein: two batch head grooves (23) which are positioned on the same straight line are arranged on the adjusting screw thread (2).

Technical Field

The invention relates to the technical field of self-tapping screws, in particular to a self-tapping screw with adjustable variable-diameter double threads.

Background

The self-tapping screw, or fast-tooth screw, is a steel fast-assembling fastener with galvanized and passivated surface. Tapping screws are often used for connecting thin metal plates (steel plates, saw plates, etc.). During connection, a thread bottom hole is firstly formed on the connected piece, and then the tapping screw is screwed into the thread bottom hole of the connected piece.

Among the prior art, self-tapping screw divides into thin shallow screw thread and thick dark screw thread two kinds when steel construction individual layer roofing is used for fixed heat preservation and waterproof layer, selects for use thin shallow screw thread when fixed thick steel plate, selects for use thick dark screw thread when fixed sheet steel to select for use the screw of different length according to the different heat preservation thickness of wanting to fix, adopt screw cooperation plastic sleeve to be used for fixed heated board or waterproofing membrane.

The above prior art solutions have the following drawbacks: because the existing screws are various and are usually mixed together, errors are easily caused when non-professionals select the screws, the thin steel plate fixed by thin and shallow threads or the thick steel plate fixed by thick and deep threads enable the heat-insulating layer and the waterproof layer not to be stably fixed, the screws are easy to loosen to fall off, and great potential safety hazards exist in the building after the screws fall off. And when the thickness of the fixed object is different, the screw of one specification can not meet all requirements, and screws of various dimensions are required to complete, so that the production cost is increased.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a self-tapping screw with adjustable variable-diameter double-thread length, which not only can adjust the fixed length, but also can fix a thick steel plate and a thin steel plate, has no problem of use error, can better ensure the stress, is single and efficient in production, reduces the storage capacity and reduces the production cost.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a self-tapping screw with adjustable double thread length of reducing, including the screw and with the regulation thread of connection can be dismantled to the screw, the screw is provided with the thick dark screw thread of fixed length on being close to the one end outer wall of head, the screw is close to the thin shallow screw thread of fixed length on the one end outer wall of afterbody, thick dark screw thread with seamless joint between the thin shallow screw thread, thick dark screw thread with regulation thread screw threaded connection.

Through the technical scheme, when the self-tapping screw is used for fixing the heat-insulating layer and the waterproof layer on the steel structure single-layer roof, the thick steel plate and the thin steel plate can be fixed through the combined design of the thin and shallow threads and the thick and deep threads. The one end that the screw is close to the afterbody is the thin shallow screw thread of fixed length, is the thick dark screw thread of fixed length immediately, and resistance stops when screwing in the steel sheet through fixed thread length, adjusts the overlap joint length between thread tightening control screw and the sleeve pipe and realizes compressing tightly fixedly, and it is unanimous to twist the steel sheet degree of depth, realizes that the atress is unified, has effectively solved the uncontrollable problem of screw fixation degree of depth.

Meanwhile, the problem of use errors does not exist, stress can be better guaranteed, the production process is single and efficient, the storage capacity is reduced, and the production cost is reduced. And it utilizes the characteristics that the fixed length can be adjusted, has solved the problem that need multiple length screw when being fixed thing thickness is different, and the practicality is strong.

The present invention in a preferred example may be further configured to: the adjusting screw fastener is provided with a groove, a transition rod which is fixedly connected with the screw in an integrated mode is arranged between the thick and deep threads and the head, and when the adjusting screw fastener is installed on the transition rod, the head is embedded in the groove.

Through the technical scheme, when the adjusting screw fastener is installed on the transition rod, the screwing screw can enable the self-tapping screw to reach the maximum fixed length, and meanwhile, the head of the screw is embedded in the groove, so that the head of the screw is effectively protected, the phenomenon of looseness of the screw is not prone to occurring, and the stability of fixation is improved.

The present invention in a preferred example may be further configured to: and the adjusting screw buckle is provided with an arc-shaped notch for the insertion of the transition rod.

Through above-mentioned technical scheme, when will adjusting the spiral shell knot and install on the screw, need not twist soon from the screw afterbody and adjust the spiral shell knot, only need will adjust the spiral shell knot and install on the transition rod along the arc breach, then twist soon and to be can so that adjust spiral shell knot threaded connection on thick dark screw thread, the installation is dismantled conveniently, does not influence the use of adjusting the spiral shell knot simultaneously.

The present invention in a preferred example may be further configured to: the screw is in thin shallow screw thread keep away from thick dark screw thread's one end integrated into one piece coaxial fixedly connected with one end is conical punching rod, the outer wall of punching rod is smooth setting.

Through the technical scheme, the punching rod with one conical end is convenient for drilling the bottom hole on a fixture, so that the mounting efficiency of the tapping screw is improved.

The present invention in a preferred example may be further configured to: the screw is made of carbon steel or stainless steel material.

Through the technical scheme, the screw made of the carbon steel or stainless steel material is stable in chemical property, not easy to corrode, high in structural strength, high in fixing stability and prolonged in service life.

The present invention in a preferred example may be further configured to: two batch head grooves which are positioned on the same straight line are arranged on the adjusting screw fastener.

Through the technical scheme, when the self-tapping screw is used, the self-tapping screw is convenient to screw by the aid of the head groove, a mode for adjusting the self-tapping screw is added, and practicability is improved.

In summary, the invention includes at least one of the following beneficial technical effects:

1. when the self-tapping screw is used for fixing a heat-insulating layer and a waterproof layer on a steel structure single-layer roof, the combination design of thin and shallow threads and thick and deep threads is adopted to realize that both a thick steel plate and a thin steel plate can be fixed. The one end that the screw is close to the afterbody is the thin shallow screw thread of fixed length, is the thick dark screw thread of fixed length immediately, and resistance stops when screwing in the steel sheet through fixed thread length, adjusts the overlap joint length between thread tightening control screw and the sleeve pipe and realizes compressing tightly fixedly, and it is unanimous to twist the steel sheet degree of depth, realizes that the atress is unified, has effectively solved the uncontrollable problem of screw fixation degree of depth.

2. The self-tapping screw has the advantages that the problem of using errors is solved, stress can be better guaranteed, the self-tapping screw is single and efficient in production, the storage capacity is reduced, and the production cost is reduced. And it utilizes the characteristics that the fixed length can be adjusted, has solved the problem that need multiple length screw when being fixed thing thickness is different, and the practicality is strong.

3. When the adjusting screw fastener is installed on the transition rod, the self-tapping screw can reach the maximum fixed length by screwing the screw, and meanwhile, the head of the screw is embedded in the groove, so that the head of the screw is effectively protected, the phenomenon of looseness is not easy to occur, and the stability of fixation is improved.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Reference numerals: 1. a screw; 2. adjusting the screw buckle; 21. a groove; 22. an arc-shaped notch; 23. a batch head groove; 3. coarse and deep threads; 4. fine and shallow threads; 5. a transition rod; 6. and (4) punching a hole rod.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the variable-diameter double-thread length-adjustable self-tapping screw disclosed by the invention comprises a screw 1 and an adjusting screw thread 2 detachably connected with the screw 1, wherein thick and deep threads 3 with fixed lengths are arranged on the outer wall of one end, close to the head, of the screw 1, thin and shallow threads 4 with fixed lengths are arranged on the outer wall of one end, close to the tail, of the screw 1, the thick and deep threads 3 are in seamless joint with the thin and shallow threads 4, and the thick and deep threads 3 are in threaded connection with the adjusting screw thread 2.

Referring to fig. 1, the end of the screw 1, which is far away from the thick and deep thread 3, of the thin and shallow thread 4 is integrally formed, coaxially and fixedly connected with a punching rod 6 with a conical end, and the outer wall of the punching rod 6 is smoothly arranged. The punching rod 6 having a tapered end facilitates drilling of a pilot hole in a fixture, thereby improving the efficiency of installing the tapping screw.

In the embodiment, the screw 1 is made of carbon steel or stainless steel material, and the screw 1 made of carbon steel or stainless steel material has stable chemical property, is not easy to corrode, and has high structural strength, thereby not only increasing the stability of fixation, but also prolonging the service life of the self-tapping screw. The double-thread screw is matched with a sleeve for use and used for fixing a single-layer flexible roof heat-insulating layer and a waterproof layer.

Two screwdriver head grooves 23 which are located on the same straight line are formed in the adjusting screw buckle 2, when the self-tapping screw is used, the screwdriver head grooves 23 are arranged to facilitate screwing of the self-tapping screw, a mode of adjusting the self-tapping screw is added, and practicability is improved.

Wherein, offer recess 21 on adjusting the turnbuckle 2, refer to fig. 2, be provided with between thick dark screw thread 3 and the head with screw 1 integrated into one piece fixed connection's transition pole 5, when adjusting the turnbuckle 2 and installing on transition pole 5, the head inlays and establishes in recess 21. When adjusting the turnbuckle 2 and installing on transition pole 5, revolve and twist screw 1 and can make self-tapping screw reach the biggest fixed length, the head inlays and establishes in recess 21 simultaneously, and the effectual head of protecting screw 1 makes its difficult emergence not hard up phenomenon, has improved fixed stability.

Referring to fig. 1, offer on the regulation spiral shell knot 2 and supply transition rod 5 to insert the arc breach 22 of establishing, when will adjusting spiral shell knot 2 and install on screw 1, need not twist soon from screw 1 afterbody and adjust spiral shell knot 2, only need will adjust spiral shell knot 2 and install on transition rod 5 along arc breach 22, then twist soon can make and adjust spiral shell knot 2 threaded connection on thick dark screw thread 3, and the installation is dismantled conveniently, does not influence the use of adjusting spiral shell knot 2 simultaneously.

The implementation principle of the embodiment is as follows: when the self-tapping screw is used for fixing a heat-insulating layer and a waterproof layer on a steel structure single-layer roof, the combination design of the thin and shallow threads 4 and the thick and deep threads 3 is adopted to realize that a thick steel plate and a thin steel plate can be fixed. The one end that screw 1 is close to the afterbody is thin shallow screw thread 4 of fixed length, is thick dark screw thread 3 of fixed length next to, and the resistance stops when screwing in the steel sheet through fixed thread length, adjusts 2 control screw of turnbuckle 1 and the overlap joint length between the sleeve pipe and realizes compressing tightly fixedly, and it is unanimous to twist the steel sheet degree of depth, realizes that the atress is unified, has effectively solved the problem that the fixed degree of depth of screw 1 can not be controlled.

Meanwhile, the problem of use errors does not exist, stress can be better guaranteed, the production process is single and efficient, the storage capacity is reduced, and the production cost is reduced. And it utilizes the characteristics that the fixed length can be adjusted, has solved the problem that need multiple length screw 1 when being fixed thing thickness is different, and the practicality is strong. .

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.