Flat head thread rolling machine

Abstract

The utility model provides a flat head thread rolling machine. The flat head thread rolling machine comprises a motor with a hollow rotating shaft. The cutting assembly is located at the output end of the motor and driven by the motor, and the electric push rod is located at the other end of the motor, penetrates through the hollow rotating shaft and is rotationally connected with the cutting assembly. The electric push rod comprises an electric push rod body and an advancing and retreating rod capable of axially stretching out and drawing back relative to the electric push rod body. The cutting assembly comprises a rotary positioning structure, and the rotary positioning structure is connected with the advancing and retreating rod so that the cutting assembly can be dragged by the advancing and retreating rod to stretch out and draw back in the axial direction while rotating. The advancing and retreating rod is directly connected with the cutting assembly through the rotary positioning structure, synchronous rotation of the advancing and retreating rod and the hollow rotating shaft is avoided, radial vibration is eliminated, and stability and reliability of the whole machine structure are facilitated; the cost is reduced, the length of the whole machine is reduced, the occupied space is reduced, and assembly and transportation are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar end processing, in particular to a flat head thread rolling machine. Background Art

[0002] Rebars are widely used in the construction field. Based on the requirements of national construction technical specifications, current key projects such as subways, bridges, tunnels, schools, hospitals, and government office areas require that rebar connections be made using sleeve connections. At the same time, the ends of the rebars must be flat, and no bevels or horseshoe shapes are allowed. Otherwise, when the two rebars are connected through the sleeve, the end face fit will not meet the requirements.

[0003] In order to realize the cutting and grinding of the steel bar ends in the existing flat head thread rolling machine, Figure 1 As shown, the cutting assembly 20 needs to extend to contact the end of the steel bar when cutting and grinding, and retract after completing the cutting and grinding; therefore, the cutter head is connected to the electric push rod 30 to achieve its axial extension and contraction. In the prior art, the cutter head is fixedly set on the cutter seat 23, and one end of the cutter seat 23 is fixedly connected to the cutter rod 24, and the other end of the cutter rod 24 is fixedly connected to the push-pull rod 4. The above-mentioned push-pull rod 4 is passed through the hollow rotating shaft 11 of the motor 10 and rotates synchronously. The electric push rod 30 includes an electric push rod body 31 and a connecting rod 34 connected to the electric push rod body 31. The rotary valve structure 5 and the push-pull rod 4; wherein, the rotary valve structure 5 is arranged between the connecting rod 34 not rotating and the push-pull rod 4 rotating, and the connecting rod 34 drives the push-pull rod 4 to expand and contract axially. Specifically, one end of the rotary valve structure 5 is fixedly connected to the connecting rod 34 of the electric push rod 30, and the other end is rotatably connected to the push-pull rod 4, that is, the push-pull rod 4 is rotatably confined in the chamber of the rotary valve by the shaft retaining spring 51 and the hole retaining spring 52 and the bearing 53 therebetween, so that no torque is transmitted between the connecting rod 34 of the electric push rod 30 not rotating and the push-pull rod 4 rotating, and it can only expand and contract axially.

[0004] However, the disadvantages of this structure are:

[0005] 1. The need to separately provide the rotary valve structure 5 and its axial movement guide structure results in high costs;

[0006] 2. The rotary valve structure 5 and its axially movable guide structure are arranged behind the motor 10. They are long in the axial direction, occupy a large space, and are inconvenient to assemble and transport.

[0007] 3. It is not conducive to the miniaturization design of the whole machine and occupies a large area when in use;

[0008] 4. The push-pull rod 4 rotates along with the main shaft of the motor 10. Due to its long length, it causes radial vibration, which affects the stability and reliability of the entire structure.

[0009] Therefore, it is necessary to improve the above-mentioned axial telescopic transmission structure. Utility Model Content

[0010] The utility model provides a flat-head thread rolling machine, comprising a motor 10 having a hollow rotating shaft 11; a cutting assembly 20 located at the output end of the motor 10 and driven by the motor 10, and an electric push rod 30 located at the other end of the motor 10 and passing through the hollow rotating shaft 11 and rotatably connected to the cutting assembly 20; the electric push rod 30 comprises an electric push rod body 31 and an advance and retreat rod 32 that can axially extend and retract relative to the electric push rod body 31; the cutting assembly 20 comprises a rotation positioning structure 21, and the rotation positioning structure 21 is connected to the advance and retreat rod 32 so that the cutting assembly 20 is pulled and retracted in the axial direction by the advance and retreat rod 32 while rotating.

[0011] Preferably, the cutting assembly 20 includes a positioning sleeve 22 fixedly connected to the output end of the motor 10, a tool holder 23 disposed in the positioning sleeve 22 and capable of rotating and axially moving relative to the positioning sleeve 22, and a tool rod 24 for driving the tool holder 23 to rotate, wherein the other end of the tool rod 24 is connected to the hollow rotating shaft 11 of the motor 10;

[0012] The rotation positioning structure 21 includes: a locking nut 211 arranged in the center hole at the end of the tool holder 23, and the locking nut 211 is bolted to the advance and retreat rod 32; a positioning bearing 212 arranged on the inner wall of the tool rod 24, and the advance and retreat rod 32 is passed through the positioning bearing 212, and the positioning bearing 212 is pressed against the end of the tool holder 23 and positioned by the boss 241 on the inner wall of the tool rod 24.

[0013] Through structural optimization, the utility model directly connects the advance and retreat rod 32 to the cutting assembly 20 through the rotating positioning structure 21, thereby avoiding the synchronous rotation of the advance and retreat rod 32 and the hollow rotating shaft 11, eliminating radial vibration, and being beneficial to the stability and reliability of the entire machine structure; in this way, there is no need to separately set up the rotary valve structure 5 and its axial movement guide structure, which reduces the cost, reduces the length of the entire machine, effectively reduces the occupied space, and facilitates assembly and transportation; it facilitates the miniaturized design of the entire machine, and occupies a small area when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Axial cross-sectional view of a flat head thread rolling machine in the prior art;

[0015] Figure 2 .Axial cross-sectional view of the flat head thread rolling machine of the present invention;

[0016] Figure 3 . An axial cross-sectional view of the axial motion portion of the flat head thread rolling machine of the present invention;

[0017] Figure 4.Assembly drawing of some components of the flat head thread rolling machine of this utility model.

[0018] Figure numerals: 10. Motor; 11. Hollow rotating shaft; 20. Cutting assembly; 21. Rotary positioning structure; 211. Locking nut; 212. Positioning bearing; 22. Positioning sleeve; 23. Tool holder; 24. Tool rod; 241. Boss; 30. Electric push rod; 31. Electric push rod body; 32. Advance and retraction rod; 4. Push-pull rod; 5. Rotary valve structure; 51. Shaft retaining spring; 52. Hole retaining spring; 53. Spring. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0020] Example 1:

[0021] like Figure 2-Figure 4 As shown, the utility model provides a flat head thread rolling machine, comprising a motor 10 with a hollow rotating shaft 11; a cutting assembly 20 located at the output end of the motor 10 and driven by the motor 10, and an electric push rod 30 located at the other end of the motor 10 and passing through the hollow rotating shaft 11 and rotatably connected to the cutting assembly 20; the electric push rod 30 comprises an electric push rod body 31 and an advance and retreat rod 32 that can axially extend and retract relative to the electric push rod body 31; the cutting assembly 20 comprises a rotation positioning structure 21, and the rotation positioning structure 21 is connected to the advance and retreat rod 32 so that the cutting assembly 20 is pulled and retracted in the axial direction by the advance and retreat rod 32 while rotating.

[0022] In a preferred embodiment, the cutting assembly 20 includes a positioning sleeve 22 fixedly connected to the output end of the motor 10, a tool holder 23 disposed in the positioning sleeve 22 and capable of rotating and axially moving relative to the positioning sleeve 22, and a tool rod 24 for driving the tool holder 23 to rotate, wherein the other end of the tool rod 24 is connected to the hollow rotating shaft 11 of the motor 10;

[0023] The rotation positioning structure 21 includes: a locking nut 211 arranged in the center hole at the end of the tool holder 23, and the locking nut 211 is bolted to the advance and retreat rod 32; a positioning bearing 212 arranged on the inner wall of the tool rod 24, and the advance and retreat rod 32 is passed through the positioning bearing 212, and the positioning bearing 212 is pressed against the end of the tool holder 23 and positioned by the boss 241 on the inner wall of the tool rod 24.

[0024] Through structural optimization, the utility model directly connects the advance and retreat rod 32 to the cutting assembly 20 through the rotating positioning structure 21, thereby avoiding the synchronous rotation of the advance and retreat rod 32 and the hollow rotating shaft 11, eliminating radial vibration, and being beneficial to the stability and reliability of the entire machine structure; in this way, there is no need to separately set up the rotary valve structure 5 and its axial movement guide structure, which reduces the cost, reduces the length of the entire machine, effectively reduces the occupied space, and facilitates assembly and transportation; it facilitates the miniaturized design of the entire machine, and occupies a small area when in use.

[0025] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A flat head thread rolling machine, characterized in that: The invention comprises a motor (10) having a hollow rotating shaft (11); a cutting assembly (20) located at an output end of the motor (10) and driven by the motor (10); and an electric push rod (30) located at the other end of the motor (10) and passing through the hollow rotating shaft (11) and rotatably connected to the cutting assembly (20); the electric push rod (30) comprises an electric push rod body (31) and an advance and retreat rod (32) capable of axially extending and retracting relative to the electric push rod body (31); the cutting assembly (20) comprises a rotation positioning structure (21), the rotation positioning structure (21) being connected to the advance and retreat rod (32) so that the cutting assembly (20) is pulled and retracted in the axial direction by the advance and retreat rod (32) while rotating.

2. The flat head thread rolling machine according to claim 1, wherein: The cutting assembly (20) includes a positioning sleeve (22) fixedly connected to the output end of the motor (10), a tool holder (23) arranged in the positioning sleeve (22) and rotating and axially moving relative to the positioning sleeve (22), and a tool rod (24) driving the tool holder (23) to rotate, and the other end of the tool rod (24) is connected to the hollow rotating shaft (11) of the motor (10); The rotation positioning structure (21) includes: a locking nut (211) arranged in the center hole of the end of the knife seat (23), and the locking nut (211) is bolted to the advance and retreat rod (32); a positioning bearing (212) arranged on the inner wall of the knife rod (24), and the advance and retreat rod (32) is passed through the positioning bearing (212), and the positioning bearing (212) is pressed against the end of the knife seat (23) and positioned by the boss (241) on the inner wall of the knife rod (24).

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