CN207145400U - Base expanding and base expanding mechanical anchor after a kind of - Google Patents

Abstract

The utility model discloses a bottom-expanding mechanical anchor bolt, which comprises an anchor rod, a nut and an expansion sleeve sleeved on the anchor rod. The anchor rod includes an upper screw part and a lower polished rod part, and the nut is threadedly connected to the screw part. , the lower end of the polished rod is provided with a frustum-shaped expansion part, the side wall of the lower end of the expansion sleeve is provided with an expansion groove along its axial direction, and the side wall of the lower end of the expansion sleeve is provided with multiple holes for increasing Teeth for anchoring effect. The post-expansion mechanical anchor bolt greatly improves the anchoring force by adding a plurality of teeth, and the anchoring effect is more guaranteed. Even if one tooth falls off, the other teeth can ensure sufficient anchoring force. In addition, through the expansion sleeve There is a ring-shaped groove on the tube at the upper end of the expansion groove, which can weaken the strength of the expansion sleeve at this place, facilitate the expansion of the lower end of the expansion sleeve, and make the expansion sleeve easily open and cut into the matrix to generate anchoring force. Simple and easy to implement.

Description

A post-expansion bottom mechanical anchor bolt

technical field

The utility model relates to an anchor bolt, in particular to a rear expanding bottom mechanical anchor bolt.

Background technique

At present, due to the disadvantages of chemical anchor bolts such as easy aging, difficult construction, and low temperature resistance, the chemical anchor bolts on the existing market have been gradually replaced by mechanical anchor bolts. The existing post-expansion mechanical anchor bolts on the market are put in through drilling and anchor bolts, and the expansion sleeve is expanded by nuts to achieve the purpose of locking. However, most of the existing post-expansion mechanical anchor bolts have poor anchoring force. The problem, therefore, urgently needs to be solved.

Utility model content

The purpose of the utility model is to solve the above-mentioned problems and provide a rear expansion bottom mechanical anchor to solve the problem of poor anchoring force of the existing rear expansion bottom mechanical anchor.

The purpose of this utility model is to realize through the following technical solutions:

A post-expansion mechanical anchor bolt, including an anchor rod, a nut and an expansion sleeve sleeved on the anchor rod, the anchor rod includes an upper screw part and a lower polished rod part, and the nut is threadedly connected to the screw part , the lower end of the polished rod part is provided with an expansion part of a conical structure, the side wall of the lower end of the expansion sleeve is provided with an expansion groove along its axial direction, and the side wall of the lower end of the expansion sleeve is provided with multiple teeth for added anchoring effect.

As a preferred solution of the present utility model, two teeth are arranged on the side wall of the lower end of the expansion sleeve.

As a preferred solution of the present utility model, the two teeth include a first tooth for positioning and a second tooth for enhancing the anchoring effect, the first tooth is a sawtooth, which has an excellent positioning effect, The outer end surface of the second tooth is a plane, which can increase the friction force and improve the anchoring effect.

As a preferred solution of the present utility model, the expansion sleeve is provided with a groove with an annular structure at the expansion part, and the groove is located above the expansion groove; furthermore, the strength of the expansion position can be reduced, and the expansion sleeve can be easily expanded. Expand.

As a preferred solution of the present invention, the bottom of the expansion sleeve is provided with a guide hole, and the radius of the guide hole decreases successively from bottom to top.

As a preferred solution of the present invention, a plurality of expansion grooves are formed on the side wall of the lower end of the expansion sleeve, and the expansion grooves are evenly distributed along the circumferential direction of the expansion sleeve.

As a preferred solution of the present utility model, spring washers and flat washers are sequentially arranged between the nut and the expansion sleeve from top to bottom.

The beneficial effect of the utility model is that the mechanical anchor bolt with rear expanded bottom can greatly improve the anchoring force by adding a plurality of teeth, and the anchoring effect is more guaranteed. Even if one tooth falls off, the other teeth can ensure sufficient anchoring. In addition, by setting a ring-shaped groove on the expansion sleeve at the upper end of the expansion groove, the strength of the expansion sleeve can be weakened, and the lower end of the expansion sleeve can be easily expanded, so that the expansion sleeve can be easily opened. Cutting into the matrix to generate anchoring force, the structure is simple and easy to realize.

Description of drawings

Fig. 1 is the structure diagram of a kind of rear expanding mechanical anchor bolt of the utility model;

Fig. 2 is a schematic diagram of the use state of a rear expansion bottom mechanical anchor bolt of the present invention.

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments. It can be understood that the embodiments described here are only used to explain the utility model, rather than limit the utility model.

Please refer to Fig. 1, in this embodiment, a mechanical anchor bolt with rear expanded bottom includes an anchor rod 1 and a nut 2, a spring washer 4, a flat washer 5, The expansion sleeve 3, the anchor rod 1 includes an upper screw part 11 and a lower polished rod part 12, the nut 2 is screwed on the screw part 11, and the lower end of the polished rod part 12 is provided with a frustum-shaped structure. The expansion part 13, the expansion sleeve 3 is sleeved on the anchor rod 1, and the bottom of the expansion sleeve 3 is provided with a guide hole, the radius of the guide hole decreases successively from bottom to top, and the lower end of the expansion sleeve 3 The side wall is provided with expansion grooves 34 along its axial direction. The expansion grooves 34 are multiple, and the multiple expansion grooves 34 are evenly distributed along the circumferential direction of the expansion sleeve 3. The expansion sleeve 34 is located on There is a groove 33 with a ring structure at the expansion part, and the side wall at the lower end of the expansion sleeve 3 is provided with a first tooth 31 for positioning and a second tooth 32 for enhancing the anchoring effect. The first tooth 31 is The outer end surface of the second tooth 32 is a plane.

In this embodiment, the expansion sleeve 3 is provided with a first tooth 31 and a second tooth 32, and the double-teeth design doubles the anchoring performance, the anti-seismic performance is better, and the anchoring effect is more reliable, safe and durable.

It is worth mentioning that, although in this embodiment, the first tooth 31 and the second tooth 32 are arranged on the expansion sleeve 3, and a double-teeth design is adopted, the utility model is not limited thereto, and the expansion sleeve 3 may also be provided with 3 teeth. 1, 4 or more, this embodiment is a preferred solution after combining manufacturing cost and anchoring effect.

Please refer to Figure 2. When in use, tighten the nut 2. When the nut 2 is tightened, the anchor rod 1 moves upward. At this time, the expansion sleeve 3 is pushed by the external force of the anchor rod 1 on the one hand, and the displacement of the top on the other hand. Restriction, coupled with the groove 33 of the annular structure on the expansion sleeve 3 weakens the strength of this place, so that the expansion sleeve 3 can be easily opened and cut into the matrix, thereby generating anchoring force.

The above embodiments only set forth the basic principles and characteristics of the present utility model, and the present utility model is not limited by the above-mentioned embodiments. Under the premise of not departing from the spirit and scope of the present utility model, the present utility model also has various changes and changes. These Variations and changes are within the scope of the claimed invention. The protection scope of the utility model is defined by the appended claims.

Claims (7)

1. A post-expansion mechanical anchor bolt, characterized in that: it includes an anchor rod, a nut and an expansion sleeve sleeved on the anchor rod, the anchor rod includes a screw part above and a polished rod part below, and the nut Threaded on the screw part, the lower end of the polished rod part is provided with a frustum-shaped expansion part, the side wall of the lower end of the expansion sleeve is provided with an expansion groove along its axial direction, and the lower end of the expansion sleeve is The side wall is provided with a plurality of teeth for increasing the anchoring effect. 2 . The post-expansion bottom mechanical anchor according to claim 1 , wherein two teeth are arranged on the side wall of the lower end of the expansion sleeve. 3 . 3. A rear-expanded bottom mechanical anchor bolt according to claim 2, characterized in that: the two teeth include a first tooth for positioning and a second tooth for enhancing the anchoring effect, and the second tooth One tooth is a sawtooth, and the outer end surface of the second tooth is a plane. 4. A post-expansion mechanical anchor according to any one of claims 1 to 3, characterized in that: the expansion sleeve is provided with a ring-shaped groove at the expansion point, and the groove is located at the expansion point. above the groove. 5 . The post-expansion bottom mechanical anchor according to claim 1 , wherein a guide hole is formed at the bottom of the expansion sleeve, and the radius of the guide hole decreases successively from bottom to top. 6 . 6. A post-expansion mechanical anchor bolt according to claim 1, characterized in that: a plurality of expansion grooves are formed on the side wall of the lower end of the expansion sleeve, and the expansion grooves are arranged along the expansion sleeve. evenly distributed in the circumferential direction. 7. The post-expansion bottom mechanical anchor bolt according to claim 1, characterized in that: spring washers and flat washers are sequentially arranged between the nut and the expansion sleeve from top to bottom.