Straight fixed-length reaming device

Abstract

The utility model discloses a straight fixed-length reaming device which comprises a drill bit, a sleeve is arranged at the rear end of the drill bit, a tool apron and a connecting rod are sequentially arranged in the sleeve from front to back, cutting edges are rotatably arranged on the two sides of the front end of the tool apron, the drill bit is in threaded connection with the sleeve, and the tool apron is connected with the connecting rod. The drill bit is suitable for the technical field of concrete structure post-anchoring, the two cutting edges move forwards along with the forward movement of the connecting rod, the two cutting edges expand outwards under the action of the tail of the drill bit, then the interior of a drill hole is expanded, the whole hole expanding process is more stable, hole expanding is more uniform, and the hole expanding effect is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of post-anchoring of concrete structures, in particular to a straight-in type fixed-length hole expanding device. Background Art

[0002] Concrete post-anchoring technology is now widely used in construction engineering fields such as civil engineering, railways, and rail transit, involving a wide variety of products. For example: chemical anchor bolts, chemical anchor bolts, expansion anchor bolts, cut-bottom anchor bolts, and expanded-bottom anchor bolts. Cut-bottom anchor bolts and expanded-bottom anchor bolts are widely favored by construction units because of their high bearing capacity, good seismic performance, and fast construction. Among them, the expanded-bottom anchor bolts require the cooperation of the reaming drill bit during the installation process to install the expanded-bottom anchor bolts in place.

[0003] The installation process is as follows: First, use an electric hammer or a water drill to complete the drilling work on the concrete substrate. Secondly, install the reaming drill bit on the electric hammer and insert it into the straight hole that has just been made. Turn on the drill switch, and the reaming cutter head on the reaming drill bit gradually opens and cuts the concrete through the hammer drilling of the electric hammer, and finally drills a conical space at the bottom of the concrete hole. Finally, put the bottom anchor bolt into the expanded hole and apply a certain torque to complete the anchoring. Looking back at the above installation process, the reaming drill bit plays a very critical role.

[0004] At present, there are various types of hole-reaming drill bits on the market, including hole-stirring drill bits, eccentric drill bits, and the like.

[0005] Stirring drill: workers swing the drill to expand the hole. This hole expansion technology cannot effectively expand the bottom of the hole into a regular conical space, and when the hole is expanded deeper, the longer the swing length of the drill bit, the smaller the swing angle, which further affects the hole expansion effect.

[0006] Eccentric drill bit: a drill bit with a hole expansion cutter at one end of the drill bit axis. When the drill bit rotates, the cutter expands outward to generate lateral force to cut the concrete hole wall. This technology has a hole expansion cutter at one end and the other end is empty, so it is easy to cause problems such as violent vibration of the drill bit, uneven hole expansion, and drill jamming during the hole expansion process. Utility Model Content

[0007] The utility model aims to overcome the defects of the prior art and provide a straight-in type fixed-length hole expanding device.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A straight-in fixed-length hole reaming device comprises a drill bit, a sleeve is provided at the rear end of the drill bit, a tool holder and a connecting rod are provided in the sleeve from front to back in sequence, cutting edges are rotatably provided on both sides of the front end of the tool holder, a threaded connection is adopted between the drill bit and the sleeve, and the tool holder is connected to the connecting rod.

[0010] Preferably, as the connecting rod moves forward, the two cutting edges move forward accordingly, and the two cutting edges expand outward under the action of the drill bit tail.

[0011] Preferably, the two cutting edges are symmetrically arranged, and the front ends of both are provided with cutting edges inclined outward. The rear ends of the two cutting edges are respectively hinged to the positioning pin holes on both sides of the front end of the tool holder.

[0012] Preferably, a tool groove is formed at the rear end of the drill bit. The cutting edge and the tool holder are both slidably arranged in the tool groove. Guide grooves are formed on both sides of the front end of the tool groove. The guide grooves are structured such that the depth gradually increases from front to back, and the guide grooves communicate with the tool groove.

[0013] Preferably, a threaded section is provided at the rear end of the connecting rod. A quantitative limit switch is screwed onto the threaded section, and a drill tail is screwed onto the rear end of the threaded section for connecting to a drilling rig.

[0014] Preferably, an anti-threaded connection is adopted between the drill bit and the casing.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0016] In the present utility model, as the connecting rod moves forward, the two cutting edges move forward accordingly, and the two cutting edges expand outward under the action of the drill bit tail, thereby reaming the inside of the drill hole. The entire reaming process is more stable, the reaming is more uniform, and the reaming effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an overall structural schematic diagram of a direct-feed fixed-size reaming device of the present utility model;

[0018] Figure 2 is a structural schematic diagram of a drill bit for internal reaming of the present utility model;

[0019] Figure 3 is a structural schematic diagram of a tool holder for internal reaming of the present utility model;

[0020] Figure 4 is a structural schematic diagram of a cutting edge for internal reaming of the present utility model;

[0021] Figure 5 is a structural schematic diagram of a connecting rod for internal reaming of the present utility model;

[0022] Figure 6 is a structural schematic diagram of a casing for internal reaming of the present utility model.

[0023] Reference numerals: 1, drill bit; 11, cutter groove; 12, guiding groove; 2, tool holder; 3, connecting rod; 4, cutting edge; 41, blade edge; 5, casing; 6, quantitative limit switch; 7, drill tail. Detailed implementation manners

[0024] The following further describes the detailed implementation manners of a direct-feed fixed-size hole expanding device of the present utility model in combination with embodiments. The direct-feed fixed-size hole expanding device of the present utility model is not limited to the descriptions of the following embodiments.

[0025] Embodiment 1:

[0026] A direct-feed fixed-size hole expanding device, as Figure 1 shown, includes a drill bit 1. A casing 5 is provided at the rear end of the drill bit 1. A tool holder 2 and a connecting rod 3 are successively arranged in the casing 5 from front to back. Cutting edges 4 are rotatably arranged on both sides of the front end of the tool holder 2. The drill bit 1 and the casing 5 are screwed together by threads, and the tool holder 2 is connected to the connecting rod 3.

[0027] In a possible implementation manner, as the connecting rod 3 moves forward, the two cutting edges 4 move forward accordingly, and the two cutting edges 4 expand outward under the action of the tail of the drill bit 1.

[0028] In a possible implementation manner, the two cutting edges 4 are symmetrically arranged, and blade edges 41 inclined outward are provided at the front ends of both of them. The rear ends of the two cutting edges 4 are respectively hinged to the positioning pin holes on both sides of the front end of the tool holder 2.

[0029] In a possible implementation manner, the two cutting edges 4 are symmetrically arranged, and blade edges 41 inclined outward are welded to the front ends of both of them. The rear ends of the two cutting edges 4 are respectively hinged to the positioning pin holes on both sides of the front end of the tool holder 2.

[0030] In a possible implementation manner, a cutter groove 11 is formed at the rear end of the drill bit 1. The cutting edges 4 and the tool holder 2 are both slidably arranged in the cutter groove 11. Guiding grooves 12 are formed on both sides of the front end of the cutter groove 11. The guiding grooves 12 are structured such that the depth gradually increases from front to back, and the guiding grooves 12 communicate with the cutter groove 11.

[0031] In a possible implementation manner, a threaded section is provided at the rear end of the connecting rod 3. A quantitative limit switch 6 is screwed onto the threaded section, and a drill tail 7 is screwed onto the rear end of the threaded section for connecting to a drilling rig.

[0032] In a possible implementation manner, the drill bit 1 and the casing 5 are screwed together by reverse threads.

[0033] Working principle: As Figure 1-3 shown, first, rotate the quantitative limit switch 6 forward. The connecting rod 3 moves backward and drives the cutting edges 4 to move backward accordingly. The two cutting edges 4 contract to the retracted state under the effect of the constricted mouth at the front end edge of the casing 5. At this time, the hole expanding device is in the closed state;

[0034] Then, connect the closed reaming device to the drilling rig through the drill tail 7, insert the reaming device into the drill hole until the drill bit 1 reaches the reaming depth, rotate the quantitative limit switch 6 backward, and then start the drilling rig. At the same time, push the connecting rod 3 forward. As the connecting rod 3 moves forward, the two cutting edges 4 move forward accordingly, and the two cutting edges 4 expand outward under the action of the guiding groove 12. As the drilling rig rotates, the inner wall of the drill hole is cut, and the inside of the drill hole is reamed. The entire reaming process is more stable, the reaming is more uniform, and the reaming effect is better.

[0035] After the reaming is completed, turn off the drilling rig and pull the connecting rod 3 backward. As the connecting rod 3 moves backward, the two cutting edges 4 move backward accordingly, and the two cutting edges 4 contract under the effect of the mouth narrowing at the front edge of the casing 5. The cutting edges 4 slide in their corresponding guiding grooves 12 until they slide into the tool grooves 11. Rotate the quantitative limit switch 6 forward to fix the position of the casing 5. At this time, the reaming device is in a closed state, and it is pulled out of the hole, that is, the reaming work is completed.

[0036] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A direct-feed fixed-length reaming device, characterized in that: It includes a drill bit (1), a casing (5) is provided at the rear end of the drill bit (1), a tool holder (2) and a connecting rod (3) are sequentially arranged in the casing (5) from front to back, cutting edges (4) are rotatably arranged on both sides of the front end of the tool holder (2), the drill bit (1) and the casing (5) are screwed together, and the tool holder (2) is connected to the connecting rod (3).

2. The direct-feed fixed-length reaming device according to claim 1, wherein: As the connecting rod (3) moves forward, the two cutting edges (4) move forward accordingly, and the two cutting edges (4) expand outward under the action of the tail of the drill bit (1).

3. The direct-feed fixed-length hole expanding device according to claim 1, characterized in that: The two cutting edges (4) are symmetrically arranged, and cutting blades (41) inclined outward are provided at the front ends of the two. The rear ends of the two cutting edges (4) are respectively hinged to the positioning pin holes on both sides of the front end of the tool holder (2).

4. The direct-feed fixed-length reaming device according to claim 3, characterized in that: A tool groove (11) is formed at the rear end of the drill bit (1), the cutting edge (4) and the tool holder (2) are both slidably arranged in the tool groove (11), guide grooves (12) are formed on both sides of the front end of the tool groove (11), the guide grooves (12) have a structure with gradually increasing depth from front to back, and the guide grooves (12) communicate with the tool groove (11).

5. The direct-feed fixed-length reaming device according to claim 1, wherein: A threaded section is provided at the rear end of the connecting rod (3), a quantitative limit switch (6) is screwed on the threaded section, and a drill tail (7) is screwed at the rear end of the threaded section for connecting a drilling rig.

6. The direct-feed fixed-length hole expanding device according to claim 1, characterized in that: The drill bit (1) and the casing (5) are screwed together with reverse threads.

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