阅读说明：本技术 一种组合螺杆结构及装拆方法 (Combined screw structure and assembling and disassembling method ) 是由 李华 韩鑫 姚进 于 2021-07-15 设计创作，主要内容包括：一种组合螺杆结构及装拆方法,其结构包括第一螺杆1、连接件2、螺母3、第二螺杆4,第一螺杆1和第二螺杆4都与螺母3通过螺纹连接,连接件2通过过盈配合将第一螺杆1和第二螺杆4连接起来,该装置结构在安装时对连接件2进行冷冻处理安装,在拆卸时通过第一孔结构23注入液压油进行拆卸,能够方便地对分段螺杆进行组合安装及拆卸,螺杆连接处能够承受一定的拉压应力和弯矩且组合起来的螺杆螺纹相位一致。(The utility model provides a combination screw rod structure and method of installing and removing, its structure includes first screw rod 1, connecting piece 2, nut 3, second screw rod 4, first screw rod 1 and second screw rod 4 all pass through threaded connection with nut 3, connecting piece 2 is connected first screw rod 1 and second screw rod 4 through interference fit, the device structure carries out the refrigeration processing installation to connecting piece 2 when the installation, inject hydraulic oil through first pore structure 23 and dismantle when dismantling, can conveniently carry out aggregate erection and dismantlement to the segmentation screw rod, the screw rod junction can bear certain tensile and compressive stress and moment of flexure and the screw rod screw thread phase place that combines up is unanimous.)

1. The utility model provides a combination screw rod structure which characterized in that: comprises a first screw rod 1, a connecting piece 2, a nut 3 and a second screw rod 4; the first screw rod 1 and the second screw rod 4 are both connected with the nut 3 through threads, the first screw rod 1 is provided with a first taper hole 11, and the second screw rod 4 is provided with a second taper hole 41; the connecting piece 2 is designed with a first conical surface 21 and a second conical surface 22 and a first hole structure 23 and a second hole structure 24; the connecting piece 2 is made of metal with good plasticity, and the first screw rod 1 and the second screw rod 4 are connected through the interference fit of the first conical surface 21 and the first conical hole 11 and the interference fit of the second conical surface 22 and the second conical hole 41.

2. The modular screw construction of claim 1, further comprising: the included angle between the generatrix of the first conical surface 21 and the second conical surface 22 of the connecting piece 2 and the axis is smaller than the equivalent friction angle.

3. A method of installing the modular screw structure of claim 1, wherein: the installation method comprises the following steps:

the method comprises the following steps: screwing a second screw rod 4 into the middle position of the nut 3;

step two: the connecting piece 2 is frozen to reduce the volume and generate elastic deformation, and can be conveniently placed into the second taper hole 41;

step three: screwing the first screw rod 1 into the middle of the nut 3, applying a certain torque, and simultaneously screwing the first screw rod 1 and the second screw rod 4 to the middle of the nut 3, so that the connecting piece 2 is clamped by the two screw rods;

step four: after the temperature of the connecting piece 2 is restored to the room temperature, the connecting piece 2 is restored to the original shape and size, at the moment, the first conical surface 21 and the first conical hole 11 of the connecting piece 2 are in interference fit, the second conical surface 22 and the second conical hole 41 are in interference fit, and the first screw rod 1 and the second screw rod 4 are connected;

step five: the nut 3 is removed.

4. A method of disassembling the modular screw structure of claim 1, wherein: the disassembling method comprises the following steps:

the method comprises the following steps: screwing the oil pipe into the first hole structure 23;

step two: hydraulic oil with certain oil pressure is injected, and the friction force generated by interference fit of the connecting piece 2 is overcome through the oil pressure, so that the first screw rod 1 and the second screw rod 4 are separated.

Technical Field

The invention relates to the field of mechanical transmission, in particular to a combined screw structure and an assembling and disassembling method.

Background

The screw is a common part in mechanical transmission, belongs to a slender rod piece, and is difficult to machine in some occasions needing long screws. The longer screw rod is easy to bend and deform during processing, so that the processing precision of the thread is poor, and waste products are easy to appear. Aiming at the processing problem of the long screw, the current common solution is to process the long screw in sections and finally combine and connect the screws processed in sections when in use, so the problem is transferred to how to combine the sectional screws.

Patent CN109296720A has proposed a novel nickel base alloy segmentation screw rod, and the device includes part structures such as draw-in groove, buckle lock, and the cooperation and the lock that mainly pass through draw-in groove and buckle die will be segmented the screw rod built-up connection and get up. The advantage of this patent is to lead to the new material characteristic of nickel base alloy, has increased the life of screw rod, and one of them section can be directly changed to the detachable segmentation mode after certain section is damaged, reduces the cost of wasting of resources and reprocessing.

Patent CN210880811U proposes an easily cleaned combined screw, which is provided with internal and external threads on two screws to be connected, and the segmented screws are connected through the threads. The advantage of this patent is that the connection operation of screw rod is fairly simple, and it is more convenient to maintain the work, and the screw rod adopts the material of nitriding steel can improve the hardness, fatigue strength and the corrosion resistance of screw rod.

Patent CN205010920U proposes a polypropylene combined screw, which is formed into an integral rod shape by connecting a metal side rod, a plastic rod and a metal middle rod in sequence. The advantage of this patent is to divide into a plurality of segments with whole screw rod for every segment length of screw rod reduces greatly, and the preparation degree of difficulty greatly reduced has thereby reduced the manufacturing cost of whole screw rod.

The above three patents all have two common disadvantages: 1. the phases of the threads of two adjacent screw rods cannot be ensured to be consistent; 2. the joint has poor ability to withstand tensile and compressive stresses or bending moments.

Disclosure of Invention

The invention mainly aims to overcome the defects of the prior art and provide a combined screw structure and an assembling and disassembling method.

The invention is realized by adopting the following technical scheme: a combined screw structure comprises a first screw 1, a connecting piece 2, a nut 3 and a second screw 4; the first screw rod 1 and the second screw rod 4 are both connected with the nut 3 through threads, the first screw rod 1 is provided with a first taper hole 11, and the second screw rod 4 is provided with a second taper hole 41; the connecting piece 2 is designed with a first conical surface 21 and a second conical surface 22 and a first hole structure 23 and a second hole structure 24; the connecting piece 2 is made of metal with good plasticity, and the first screw rod 1 and the second screw rod 4 are connected through the interference fit of the first conical surface 21 and the first conical hole 11 and the interference fit of the second conical surface 22 and the second conical hole 41.

Further, the included angle between the generatrix of the first conical surface 21 and the second conical surface 22 of the connecting piece 2 and the axis is smaller than the equivalent friction angle.

Further, the invention also provides an installation method of the combined screw structure, which comprises the following steps:

the method comprises the following steps: screwing a second screw rod 4 into the middle position of the nut 3;

step two: the connecting piece 2 is frozen to reduce the volume and generate elastic deformation, and can be conveniently placed into the second taper hole 41;

step three: screwing the first screw rod 1 into the middle of the nut 3, applying a certain torque, and simultaneously screwing the first screw rod 1 and the second screw rod 4 to the middle of the nut 3, so that the connecting piece 2 is clamped by the two screw rods;

step four: after the temperature of the connecting piece 2 is restored to the room temperature, the connecting piece 2 is restored to the original shape and size, at this time, the first conical surface 21 and the first conical hole 11 of the connecting piece 2 are in interference fit, the second conical surface 22 and the second conical hole 41 are in interference fit, and the first screw rod 1 and the second screw rod 4 are connected.

Step five: the nut 3 is removed.

Further, the invention also provides a disassembling method of the combined screw, which comprises the following steps:

the method comprises the following steps: screwing the oil pipe into the first hole structure 23;

step two: hydraulic oil with certain oil pressure is injected, and the friction force generated by interference fit of the connecting piece 2 is overcome through the oil pressure, so that the first screw rod 1 and the second screw rod 4 are separated.

The invention has the beneficial effects that: the nut 3 is matched with the first screw rod 1 and the second screw rod 4 at the same time to ensure that the thread phases of the first screw rod 1 and the second screw rod 4 are consistent, the first screw rod 2 and the second screw rod 4 are connected through the interference fit of the connecting piece 2, the first screw rod 2 and the second screw rod 4, and the connecting part can bear certain tensile and compressive stress and bending moment; the device structure carries out the refrigeration processing installation to connecting piece 2 when the installation, injects hydraulic oil through first pore structure 23 and dismantles when dismantling, can conveniently carry out aggregate erection and dismantlement to the segmentation screw rod.

Drawings

Fig. 1 is an assembly schematic of the present invention.

Fig. 2 is a schematic structural view of the first screw 1 of the present invention.

Fig. 3 is a schematic structural view of the second screw 4 of the present invention.

Fig. 4 is a top view of the connector 2 of the present invention.

Fig. 5 is a front view of the connector 2 of the present invention.

In the figure: the nut comprises a first screw rod 1, a connecting piece 2, a nut 3, a second screw rod 4, a first conical surface 21, a second conical surface 22, a first hole structure 23, a second hole structure 24, a first conical hole 11 and a second conical hole 41.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, a combined screw structure includes a first screw 1, a connecting member 2, a nut 3, and a second screw 4; the first screw rod 1 and the second screw rod 4 are both connected with the nut 3 through threads, the first screw rod 1 is provided with a first taper hole 11, and the second screw rod 4 is provided with a second taper hole 41; the connecting piece 2 is designed with a first conical surface 21 and a second conical surface 22 and a first hole structure 23 and a second hole structure 24; the connecting piece 2 is made of metal with good plasticity, and the first screw rod 1 and the second screw rod 4 are connected through the interference fit of the first conical surface 21 and the first conical hole 11 and the interference fit of the second conical surface 22 and the second conical hole 41.

The included angle between the generatrix of the first conical surface 21 and the second conical surface 22 of the connecting piece 2 and the axis is smaller than the equivalent friction angle.

The invention also provides an installation method of the combined screw structure, which comprises the following steps:

the method comprises the following steps: screwing a second screw rod 4 into the middle position of the nut 3;

step two: the connecting piece 2 is frozen to reduce the volume and generate elastic deformation, and can be conveniently placed into the second taper hole 41;

step three: screwing the first screw rod 1 into the middle of the nut 3, applying a certain torque, and simultaneously screwing the first screw rod 1 and the second screw rod 4 to the middle of the nut 3, so that the connecting piece 2 is clamped by the two screw rods;

step four: after the temperature of the connecting piece 2 is restored to the room temperature, the connecting piece 2 is restored to the original shape and size, at this time, the first conical surface 21 and the first conical hole 11 of the connecting piece 2 are in interference fit, the second conical surface 22 and the second conical hole 41 are in interference fit, and the first screw rod 1 and the second screw rod 4 are connected.

Step five: the nut 3 is removed.

The invention also provides a disassembling method of the combined screw structure, which comprises the following steps:

the method comprises the following steps: screwing the oil pipe into the first hole structure 23;

step two: and hydraulic oil with certain oil pressure is injected into the connecting piece 2, and the friction force generated by interference fit of the connecting piece 2 is overcome through the oil pressure, so that the first screw rod 1 and the second screw rod 4 are separated.

When the device is installed, the second screw rod 4 is screwed into the middle position of the nut 3, then the connecting piece 2 is subjected to freezing treatment, the size of the connecting piece is reduced to generate elastic deformation, the connecting piece can be conveniently placed into the second taper hole 41 (the connecting piece 2 and the second taper hole 41 do not generate interference fit), then the first screw rod 1 is screwed into the middle part of the nut (the connecting piece 2 and the first taper hole 11 do not generate interference fit), then certain axial force is applied to screw the first screw rod 1 and the second screw rod 4 towards the middle position of the nut 3 at the same time, so that the connecting piece 2 is clamped by the two screw rods, and small interference is generated. After the temperature of the connecting piece 2 is restored to the room temperature, the connecting piece 2 is restored to the original shape and size, at the moment, the interference magnitude between the first conical surface 21 and the first conical hole 11 of the connecting piece 2 is further increased, and the interference magnitude between the second conical surface 22 and the second conical hole 41 is also increased, so that the first screw rod 1 and the second screw rod 4 are connected, and because the inclination angle between the generatrix of the first conical surface 21 and the second conical surface 22 of the connecting piece 2 and the axis is smaller than the equivalent friction angle, the connecting piece 2 can be self-locked, is connected and fastened, and can bear certain tensile and compressive stress and bending moment. In the process of restoring the connecting piece 2 to the room temperature, the air between the connecting piece 2 and the first screw 1 and the second screw 4 is exhausted through the second hole structure 24 and then through the first hole structure 23.

When the device is disassembled, the oil pipe is firstly screwed into the first hole structure 23, hydraulic oil with certain oil pressure is injected into the connecting piece 2, the hydraulic oil enters the contact surface of the connecting piece 2 and the first screw rod 1 and the second screw rod 4 through the first hole structure 23 and the second hole structure 24, and the friction force between the connecting piece 2 and the first screw rod 1 and the second screw rod 4 is overcome through the oil pressure of the hydraulic oil, so that the first screw rod 1 and the second screw rod 4 are separated.

Compared with the prior art, the invention has the technical progress that: the nut 3 is matched with the first screw rod 1 and the second screw rod 4 at the same time to ensure that the thread phases of the first screw rod 1 and the second screw rod 4 are consistent, the first screw rod 1 and the second screw rod 4 are connected through the interference fit of the connecting piece 2 and the first screw rod 1 and the second screw rod 4, and the connecting part can bear certain tensile and compressive stress and bending moment; the device structure carries out the refrigeration processing installation to connecting piece 2 when the installation, injects hydraulic oil through first pore structure 23 and dismantles when dismantling, can conveniently carry out aggregate erection and dismantlement to the segmentation screw rod.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.