阅读说明：本技术 塑料包头螺钉 (Plastic head-covering screw ) 是由 李光千 窦敏 于 2019-09-23 设计创作，主要内容包括：本发明公开一种专用的塑料包头螺钉,紧固连接塑料衬板和塑料安装板,由包头螺钉和塑料包头帽子固定连接在一起组成,包头螺钉由圆扁头、方颈和螺杆组成,圆扁头、方颈和螺杆具有相同的中心轴且沿中心轴的方向依次固定连接；圆扁头是两端面是平面的圆柱形,固定镶嵌在塑料包头帽子的内部,方颈的横截面是正方形,在轴向上的一段固定镶嵌在塑料包头帽子的内部,另一段伸出在塑料包头帽子之外；塑料包头帽子是两端面是平面的圆柱形,侧壁上设有一圈齿状结构；安装后与塑料衬板齐平,使衬板表面平整,无螺钉凸起,具有防止跟转、防止脱出、防止耐磨、抗静电性能,使工作于塑料衬板表面的部件的使用寿命更长。(The invention discloses a special plastic wrapping head screw, which is fixedly connected with a plastic lining plate and a plastic mounting plate and consists of a wrapping head screw and a plastic wrapping head cap which are fixedly connected together, wherein the wrapping head screw consists of a round flat head, a square neck and a screw rod, and the round flat head, the square neck and the screw rod have the same central shaft and are sequentially and fixedly connected along the direction of the central shaft; the round flat head is a cylinder with two planar end faces and is fixedly embedded in the plastic cap head, the cross section of the square neck is square, one section in the axial direction is fixedly embedded in the plastic cap head, and the other section extends out of the plastic cap head; the plastic head covering cap is a cylinder with two planar end faces, and a circle of tooth-shaped structure is arranged on the side wall; after being installed, the lining plate is flush with the plastic lining plate, so that the surface of the lining plate is smooth, no screw is raised, the anti-rotation, anti-dropping, anti-abrasion and anti-static performances are realized, and the service life of parts working on the surface of the plastic lining plate is longer.)

1. The utility model provides a plastics baotou screw, fastening connection plastics welt (7) and plastics mounting panel (8), characterized by: the plastic cap is formed by fixedly connecting a cap head screw and a plastic cap head cap (1), the cap head screw is formed by a round flat head (3), a square neck (4) and a screw rod (5), the round flat head (3), the square neck (4) and the screw rod (5) have the same central shaft and are sequentially and fixedly connected along the direction of the central shaft; the round flat head (3) is a cylinder with two plane end faces, is fixedly embedded in the plastic cap (1), the cross section of the square neck (4) is square, one section in the axial direction is fixedly embedded in the plastic cap (1), and the other section extends out of the plastic cap (1); the plastic cap (1) is a cylinder with two plane end faces, and a circle of dentate structure (2) is arranged on the side wall.

2. The plastic ferrule screw as defined in claim 1, wherein: the outer diameter of the plastic head covering cap (1), the outer diameter of the round flat head (3), the side length of the cross section of the square neck (4) and the outer diameter of the screw rod (5) are reduced in sequence.

3. The plastic ferrule screw as defined in claim 2, wherein: the outer diameter of the plastic cap-covered cap (1) is D, the outer diameter of the round flat head (3) is D1, the outer diameter of the screw (5) is D, the side length of the square of the cross section of the square neck (4) is a, D is more than 3D, D1 is more than 2D, D1 is more than a, and D =0.8 a.

4. The plastic ferrule screw as defined in claim 3, wherein: the axial length of the plastic cap (1) is L1, the axial length of the square neck (4) extending out of the plastic cap (1) is L2, and L2= 0.2-0.5L 1.

5. The plastic ferrule screw of claim 4, wherein: a stepped counter bore is formed in the plastic lining plate (7), the plastic cap (1) is matched with a large hole in the stepped counter bore, the axial length L1 is equal to the depth of the large hole in the stepped counter bore, and the end face of the plastic cap (1) is flush with the end face of the large hole in the counter bore; the square neck (4) extending out of the plastic cap (1) is tightly matched with the small hole in the counter bore, and the axial length L2 is smaller than the depth of the small hole in the stepped counter bore.

6. The plastic ferrule screw as defined in claim 1, wherein: the plastic cap (1) is made of ultra-high molecular weight polyethylene, nylon or polyurethane.

7. The plastic ferrule screw as defined in claim 1, wherein: the longitudinal section of the tooth-like structure (2) can be saw-tooth-shaped, round or rectangular.

8. The plastic ferrule screw as defined in claim 1, wherein: the plastic cap head cap (1) is provided with a cross or hexagonal groove (6) in the middle of the end surface back to the screw rod (5).

9. The plastic ferrule screw as defined in claim 1, wherein: the outer diameter of the tooth-shaped structure (2) is equal to that of the plastic cap (1).

Technical Field

The invention relates to a special screw, in particular to a plastic head-covering screw for fastening and connecting a plastic lining plate, which is used for occasions needing to install a wear-resistant or antistatic plastic lining plate on a working surface.

Background

The plastic cap-wrapping screw can be widely applied to various scales of feed factories, flour factories, rice factories, oil factories, pharmaceutical factories, grain depots, harbors and docks, coal mines and other occasions needing to install the plastic lining plates so as to improve the wear resistance or the antistatic performance of the working surface. The existing screw installed on the plastic liner plate is generally a common hexagon socket head cap screw or a common screw as shown in fig. 1, the joint of the head 11 and the shaft 13 of the screw is a transition section 12, the head 11 is conical, the outer diameter of the transition section 12 is larger than the outer diameter of the shaft 13 but smaller than the outer diameter of the head 11, and the head 11 and the transition section 12 are both wrapped by a conical plastic cap 10. After the screw with the structure is installed, the conical plastic cap 10 protrudes out of the surface of the plastic lining plate, so that friction and material running resistance are increased, the running reliability of equipment is reduced, the plastic cap 10 is very easy to break off and wear due to the impact of materials, and at the moment, sparks are easily generated due to the friction of the exposed steel screw head 11 and the materials or other moving parts, so that potential safety hazards are brought. After the nut is used, if the nut is loosened, the screw is easy to fall off and drop because the screw head 11 does not have the anti-slip function, and after the nut is bitten with the rod part 13, the screw does not have the good rotation stopping function, so that the screw is difficult to detach.

Disclosure of Invention

The invention aims to solve the problems of the existing screw installed on the plastic liner plate, and provides a plastic ferrule screw which is flush with the surface of the plastic liner plate after installation, cannot be impacted and has an anti-slipping function.

In order to achieve the purpose, the invention adopts the following technical scheme: the plastic liner plate and the plastic mounting plate are fixedly connected together by the plastic cap head cap and the cap head screw, the cap head screw consists of a round flat head, a square neck and a screw rod, and the round flat head, the square neck and the screw rod have the same central shaft and are sequentially and fixedly connected along the direction of the central shaft; the round flat head is a cylinder with two planar end faces and is fixedly embedded in the plastic cap head, the cross section of the square neck is square, one section in the axial direction is fixedly embedded in the plastic cap head, and the other section extends out of the plastic cap head; the plastic cap head is a cylinder with two plane end faces, and a circle of tooth-shaped structure is arranged on the side wall.

Further, the outer diameter of the plastic cap head, the outer diameter of the round flat head, the side length of the cross section of the square neck and the outer diameter of the screw are reduced in sequence.

Further, the outer diameter of the plastic cap head is D, the outer diameter of the round flat head is D1, the outer diameter of the screw is D, the side length of the square of the cross section of the square neck is a, D is more than 3D, D1 is more than 2D, D1 is more than a, and D =0.8 a.

Furthermore, the axial length of the plastic cap with a toe cap is L1, the axial length of the square neck extending out of the plastic cap with a toe cap is L2, and L2= 0.2-0.5L 1.

Furthermore, a stepped counter bore is formed in the plastic lining plate, the plastic cap and the cap are matched with a large hole in the stepped counter bore, the axial length L1 is equal to the depth of the large hole in the stepped counter bore, and the end face of the plastic cap and the end face of the large hole in the counter bore are flush; the square neck extending out of the plastic cap head is tightly matched with the small hole in the counter bore, and the axial length L2 is smaller than the depth of the small hole in the stepped counter bore.

The invention adopts the technical scheme to highlight the beneficial effects that:

1. the invention changes the contact and fixation mode of the existing screw and the plastic lining plate, and the screw is flush with the plastic lining plate after being installed, so that the surface of the lining plate is smooth, no screw bulge exists, and the cap with the anti-falling tooth shape can better prevent the nut from loosening and prevent the screw with the plastic head from retreating from the plastic lining plate.

2. The invention is especially suitable for the installation of the plastic lining board in the occasions requiring wear resistance and static resistance, can be widely used on various devices, and is a more reliable and safer plastic lining board fastening product.

3. The invention has certain follow-up rotation prevention, drop prevention, wear resistance prevention and antistatic performance.

4. The invention can prolong the service life of the parts working on the surface of the plastic lining plate, and obviously improve the reliability and safety of equipment operation.

Drawings

FIG. 1 is a schematic structural view of a conventional screw;

FIG. 2 is a schematic illustration of the structure and dimensioning of the present invention;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is a schematic view of the mounting structure of the present invention;

in FIGS. 2-5: 1. a plastic cap with a wrapping head; 2. a tooth-shaped structure; 3. a round and flat head; 4. a square neck; 5. a screw; 6. a groove; 7. a plastic liner plate; 8. a plastic mounting plate; 9. and a nut.

Detailed Description

As shown in fig. 2, 3 and 4, the present invention comprises a cap screw and a plastic cap 1, wherein the cap screw comprises a round flat head 3, a square neck 4 and a screw rod 5, the round flat head 3, the square neck 4 and the screw rod 5 have the same central axis and are sequentially and fixedly connected together along the central axis to form an integral cap screw. The plastic cap 1 and the cap head screw are fixedly connected together in a pressing or direct injection molding pouring mode.

The round flat head 3 is a cylindrical structure, and two end faces of the round flat head are planes. The round flat head 3 is integrally fixed and embedded in the plastic head cap 1. The cross section of the square neck 4 is square, one section of the square neck 4 in the axial direction is fixedly embedded in the plastic cap 1, and the other section of the square neck extends out of the plastic cap 1.

The plastic cap 1 is a cylindrical structure, and two end faces of the cap are planes. The side wall of the plastic cap 1 is provided with a circle of tooth-shaped structure 2, and the outer diameter of the tooth-shaped structure 2 is equal to the outer diameter of the plastic cap 1.

The outer diameter of the plastic cap 1, the outer diameter of the round flat head 3, the side length of the cross section of the square neck 4 and the outer diameter of the screw 5 are reduced in sequence.

The outer diameter of the plastic cap 1 is D, the outer diameter of the round flat head 3 is D1, the outer diameter of the screw 5 is D, the side length of the square of the cross section of the square neck 4 is a, wherein D is more than 3D, D1 is more than 2D, D1 is more than a, and D =0.8 a.

The axial total length of the invention is L3, the axial length of the plastic toe cap 1 is L1, the axial length of the square neck 4 extending out of the plastic toe cap 1 is L2, L2= 0.2-0.5L 1, and the axial total length of the screw 5 is equal to L3-L1-L2.

The material of the plastic cap 1 may be ultra-high molecular weight polyethylene, nylon, polyurethane, or the like.

The longitudinal section of the tooth-like structure 2 can be saw-toothed, circular or rectangular, etc., which can prevent the invention from being removed from the plastic lining board.

Referring to fig. 3, a cross or hexagonal groove 6 is formed in the middle of the end surface of the plastic cap head cap 1, which faces away from the screw 5.

Referring to fig. 5, when the plastic liner 7 and the plastic mounting plate 8 are fastened together, the plastic liner 7 is provided with a step-shaped counter bore, the plastic cap 1 is matched with a large hole in the counter bore, and the axial length L1 of the plastic cap 1 is equal to the depth of the large hole in the counter bore. The end face of the plastic cap 1 is flush with the end face of the large hole in the counter bore, so that the plastic cap 1 is not exposed out of the counter bore and has no protrusion. The square neck 4 extending out of the plastic cap head 1 is tightly matched with the small hole in the counter bore, and the screw rod 5 extends out of the plastic liner plate 7, penetrates through the plastic mounting plate 8, is installed with the plastic mounting plate 8 in a threaded fit mode, and is fixed through the nut 9. The axial length L2 of the square neck 4 extending beyond the plastic cap 1 is less than the depth of the hole in the counterbore. When the screw is installed, the square neck 4 can be rapidly and effectively extruded into the small hole in the counter bore of the plastic lining plate 7, and the follow-up rotation phenomenon of the screw 5 when the nut 9 is screwed is effectively prevented. When the screw 5 and the nut 9 are bitten, the corresponding wrench is used for assisting disassembly and assembly through the groove 6 on the plastic head covering cap 1. The tooth-shaped structure 2 is tightly attached to the side wall of the counter bore on the plastic lining plate 7, so that the whole plastic lining plate 7 can be prevented from falling off.