CN212003878U

CN212003878U - High-strength cement screw

Info

Publication number: CN212003878U
Application number: CN202020498705.1U
Authority: CN
Inventors: 周乾
Original assignee: Zhejiang Jingyi Standard Parts Co ltd
Current assignee: Zhejiang Jingyi Standard Parts Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-11-24
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to a standard component technical field, concretely relates to is used in a high strength cement screw in modern building and interior decoration field. The utility model discloses a body, be equipped with the external screw thread on the body, the head of body is equipped with the big conical head in outer little, several teeth that the external screw thread is close to the conical head are equipped with inside sunken V type breach, external screw thread and V type breach form the flower tooth. The beneficial effects of the utility model are that under the condition that does not increase current screw manufacturing cost hardly, the chip removal is smooth and easy when satisfying high strength cement screw and twist the cement wall, can bear great intensity load simultaneously.

Description

High-strength cement screw

Technical Field

The utility model relates to a standard component technical field, concretely relates to is used in a high strength cement screw in modern building and interior decoration field.

Background

In the field of modern buildings and interior decoration, objects are required to be fixed on buildings such as cement walls and brick walls, especially for heavier objects such as electric water heaters, screws and bolts are required to bear larger strength after being fixed on the walls.

Chinese utility model patent CN201318367Y discloses a cement screw in 2009 in 9 months and 30 days, has increased its fastening force through 2 rows of low tooth screw threads, can fix the heavier object than ordinary screw, but this product often needs to bore a aperture in advance when using, often because the cement piece is not in time discharged when the cement screw is twisted half, the card is in 2 rows to the tooth screw thread, finally leads to the cement screw can't continue to attack into.

Chinese utility model patent CN201090582Y publication No. 2008, 7, 23 discloses another kind of cement screw, and this product adopts the drill bit to punch through the preceding drill bit structure that increases at conventional cement screw, and the screw directly twists in the hole that preceding drill bit was beaten at the back. However, the cost of adding a drill bit structure in front of a conventional cement screw, which is typically between a few cents and a few gross costs in size, is quite high, and between a few cents and a few tens of cents in size. Ultimately resulting in the production cost of the product being tens to tens of times the price of ordinary cement screws.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiency of the background art, the utility model provides a high strength cement screw.

The technical scheme of the utility model is that: the novel tooth-shaped screwdriver comprises a body, be equipped with the external screw thread on the body, the head of body is equipped with the big-end-up's in outer little, the external screw thread is close to a few teeth of conical head and is equipped with inside sunken V type breach, external screw thread and V type breach form the flower tooth.

Preferably, the external thread is provided with an inward concave V-shaped notch close to 3 teeth-4 teeth of the cone head.

Preferably, the external thread is provided with an inward concave V-shaped notch close to the thread of which the conical head accounts for 30% -40% of the total length of the external thread.

Preferably, the thread angle 2a of the external thread is 40 °.

Preferably, an inner quincuncial groove is formed in the tail pan head of the body.

Preferably, the cone angle 4a of the cone head is in the range of 10 ° to 20 °.

Preferably, the cone angle 4a of the cone head is 15 °.

Preferably, the body is made of carbon steel material, and the hardness of the body is HRC40-HRC 50.

The beneficial effects of the utility model are that under the condition that does not increase current screw manufacturing cost hardly, the chip removal is smooth and easy when satisfying high strength cement screw and twist the cement wall, can bear great intensity load simultaneously.

Drawings

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

Fig. 2 is a partially enlarged view of a portion a of fig. 1.

Fig. 3 is a left side view of the present invention.

In fig. 1-3, a body 1, an external thread 2, a thread angle 2a, a notch 3, a cone head 4, a cone angle 4a, a pan head 5, and an internal plum blossom groove 6.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in fig. 1-3, this embodiment provides a high strength cement screw, including body 1, be equipped with external screw thread 2 on the body 1, the head of body 1 is equipped with little big-end-up's conical head 4, several teeth that external screw thread 2 is close to conical head 4 are equipped with inside sunken V type breach 3, external screw thread 2 and V type breach 3 form the flower tooth.

The conical head 4 can be conical or truncated cone-shaped, the conical head 4 can also be a round angle with a truncated cone-shaped head, the conical head 4 is convenient to position and screw into a cement wall, and a small lead hole is screwed out of the cement wall by the conical head 4 during use.

The external thread 2 and the V-shaped notch 3 form a flower tooth similar to a saw tooth shape, like the shape of a saw blade, so that cement scraps can be made smaller like small particles when a high-strength cement screw is driven into a cement wall, and then the cement scraps are spirally discharged in the grooves between the external thread 2. Enable the spline teeth can enable the utility model discloses can not block when attacking the cement wall and die. Simultaneously, the external threads 2 with a plurality of teeth at the back do not have the V-shaped notch 3, so that the utility model can be firmly fixed on the wall, and can bear strong load.

This V type breach 3's simple manufacture only increases a process at present self-tapping screw's on the market external screw 2 that has now, with 2 preceding several teeth of external screw through the mould directly extrude V type breach 3 can, have the low cost of processing, the screw is twisted to the guide screw has the askew advantage of can not twisting simultaneously.

For most of high-strength cement screws with common standard length specifications, tests show that the external thread 2 is preferably provided with an inward-concave V-shaped notch 3 close to 3-4 teeth of the conical head 4.

For some high-strength cement screws which need to be driven into a thick cement wall and bear larger load, large-size high-strength cement screws with lengthened length are generally selected, and because the screws are generally long after all, in order to reduce the driving time, the threads of the external thread 2, which are close to the conical head 4 and account for 30% -40% of the total length of the external thread 2, are preferably provided with inward-recessed V-shaped notches 3.

For faster attack on the cement wall, the thread angle 2a of the external thread 2 is preferably 40 °. The thread angle 2a of the external thread 2 is 20-30 degrees smaller than that of a conventional tapping screw on the market, so that the external thread can be quickly tapped into a wall, the operation time is saved, the labor cost of the large-scale interior decoration project of the existing building is high, and the time is particularly important to be saved.

Preferably, an inner plum blossom groove 6 is arranged on the tail pan head 5 of the body 1. The inner plum blossom groove 6 can be adopted for some equipment requiring anti-dismantling, so that the dismantling difficulty of non-professional personnel is improved, and the occurrence of safety accidents is reduced. Of course, cross slots or straight slots may be used for some common requirements.

Preferably, the cone angle 4a of the cone head 4 is in the range of 10 ° to 20 °. The angle is more suitable for making a lead hole on a cement wall, and the self-tapping screw is not easy to twist.

Through tests, the cone angle 4a of the cone head 4 is preferably 15 °.

In order to improve the load bearing capacity of the product of the present invention, preferably, the body 1 is made of carbon steel material, and then the hardness of the product is improved through quenching processing, so that the hardness of the body 1 is HRC40-HRC 50. Meanwhile, the antirust capacity of the steel after quenching is greatly improved.

To diameter 6mm, length 60mm the utility model discloses the product can bear 1000N's load for a long time through the test. When inserting the steel chisel between coiled hair 5 and the wall, can bear simultaneously in one minute and beat the steel chisel with the hammer in succession, and the utility model discloses the product does not fracture and drops.

The present embodiment should not be considered as a limitation of the present invention, but any modification made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides a high strength cement screw, includes body (1), its characterized in that: be equipped with external screw thread (2) on body (1), the head of body (1) is equipped with outer little big-end-up's conical head (4), several teeth that external screw thread (2) are close to conical head (4) are equipped with inside sunken V type breach (3), external screw thread (2) and V type breach (3) form the flower tooth.

2. A high strength cement screw as claimed in claim 1, wherein: and 3 teeth-4 teeth of the external thread (2) close to the conical head (4) are provided with inward sunken V-shaped notches (3).

3. A high strength cement screw as claimed in claim 1, wherein: the thread of the external thread (2) which is close to the conical head (4) and accounts for 30% -40% of the total length of the external thread (2) is provided with an inward-concave V-shaped notch (3).

4. A high strength cement screw as claimed in any one of claims 1 to 3, wherein: the thread angle (2a) of the external thread (2) is 40 degrees.

5. A high strength cement screw as claimed in claim 1, wherein: an inner plum blossom groove (6) is arranged on the tail pan head (5) of the body (1).

6. A high strength cement screw as claimed in claim 1, wherein: the cone angle (4a) of the cone head (4) is in the range of 10 DEG to 20 deg.

7. A high strength cement screw as claimed in claim 1, wherein: the cone angle (4a) of the cone head (4) is 15 degrees.

8. A high strength cement screw as claimed in claim 1, wherein: the body (1) is made of carbon steel materials, and the hardness of the body (1) is HRC40-HRC 50.