Portable reinforcing steel bar straight thread threading machine and threading method thereof

Abstract

The invention discloses a portable steel bar straight thread threading machine and a threading method thereof, and belongs to the technical field of construction machinery. The reinforcing steel bar positioning mechanism is arranged at one end of the vehicle body; the reinforcing steel bar positioning mechanism is provided with a positioning space with an adjustable size, and is provided with a floating space with a preset length in the X-axis direction; the rotary threaded cutter is arranged opposite to the steel bar positioning mechanism in the X-axis direction; the rotary thread cutter has a rotational degree of freedom, and a connector positioner is arranged in the rotary thread cutter; and the connector positioner controls the reciprocating degree of freedom of the reinforcing steel bar in the X-axis direction. According to the invention, a portable straight thread threading machine is adopted to carry out secondary processing on an applied unqualified straight thread joint at any time along with a construction site, so that the quality is ensured to be completely qualified. Besides, the steel bar positioning mechanism is in an open type positioning mode and is suitable for positioning the steel bars with certain lengths, the steel bars can be directly placed from the open position, and additional manual or mechanical long-distance dragging, inserting and positioning are not needed. Meanwhile, a floating space in the X-axis direction is given by the steel bar positioning mechanism, and the floating space is used for generating the thread pitch needed by straight thread turning.

Description

Technical Field

[0001] The invention belongs to the technical field of construction machinery, and in particular relates to a portable steel bar straight threading machine and a threading method thereof. Background Art

[0002] According to the construction industry, there are many regulations for steel bar connections, and the quality of steel bar joints is particularly important. The straight thread connection process is currently in a very mature state. However, there are still unqualified products put into use before the straight thread joints are processed and shipped out and used. Because the straight thread joint processing machinery is a medium-sized machinery, the processing location and the machinery are used in a fixed position. After the unqualified straight thread joint steel bars are applied to the main structure, there is no way to rectify them to get straight thread steel bar joints, which leads to hidden dangers in the steel bar connection. Summary of the invention

[0003] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a portable steel bar straight threading machine and a threading method thereof.

[0004] The present invention adopts the following technical scheme: a portable steel bar straight threading machine, comprising a body, the body having a degree of freedom of movement; the length of the body is defined as an X-axis direction, and the width is defined as a Y-axis direction; and further comprising: A steel bar positioning mechanism is provided at one end of the vehicle body; the steel bar positioning mechanism has a positioning space with adjustable size and a floating space with a predetermined length in the X-axis direction; The rotary thread tool is arranged opposite to the steel bar positioning mechanism in the X-axis direction; the rotary thread tool has a rotational degree of freedom, and a connector positioner is arranged inside the rotary thread tool; the connector positioner controls the reciprocating degree of freedom of the steel bar in the X-axis direction; A driving mechanism is transmission-connected to the rotating thread tool.

[0005] In a further embodiment, the steel bar positioning mechanism comprises: A floating assembly mounted on the upper surface of the vehicle body; A clamping claw cylinder, drivingly connected to the output end of the floating assembly; The first clamping member and the second clamping member are respectively arranged at two output ends of the clamping cylinder; the working modes between the first clamping member and the second clamping member at least include: a solid positioning mode and a dynamic positioning mode.

[0006] In a further embodiment, the rotary thread tool comprises: The tool holder comprises: a base, a body connected to the base, and a mounting cavity opened inside the body; the base has a connecting end, which is configured to be transmission-connected to the driving mechanism, and the mounting cavity is configured to install the connector locator; At least one set of thread cutter assemblies is distributed in the body at a predetermined distance; the thread cutter assemblies include: A guide seat is correspondingly installed in the body; an arc-shaped guide groove is provided on the guide seat; A knife handle is movably sleeved in the guide seat; a guide column is provided on one side of the knife handle, and the guide column is adapted to the arc-shaped guide groove; A rotary cylinder is arranged below the guide seat; the bottom of the tool handle is rotatably connected to a rotary rod of the rotary cylinder; The cutter head is fixedly mounted on the top of the cutter handle; the cutter head is driven by a rotary cylinder and is combined with an arc guide groove and a guide column to adjust the cutting amount.

[0007] In a further embodiment, the floating assembly comprises: The forward and reverse motors and the bearing seat are arranged adjacent to each other along the X-axis; A threaded rod rotatably mounted in the bearing seat; The positioning plate is connected to the threaded rod through threaded transmission; the threaded rod is configured to fix the clamping jaw cylinder.

[0008] In a further embodiment, the first clamping member comprises: A first clamping plate is configured to be connected to the clamping jaw cylinder; The first positioning plate and the second positioning plate are vertically fixed to the two end surfaces of the first clamping plate along the Y-axis; the clamping surfaces of the first positioning plate and the second positioning plate are both concave surfaces; A driving cylinder is vertically mounted on the outer side of the first clamping plate along the Y-axis direction; The inner clamping plate is arranged between the first positioning plate and the second positioning plate and is transmission-connected to the output end of the driving cylinder.

[0009] In a further embodiment, the second clamping member comprises: A second clamping plate is configured to be connected to the clamping jaw cylinder; A mounting block connected to the second clamping plate; a clamping surface of the mounting block is provided with at least two sets of mounting grooves; A plurality of clamping wheels are correspondingly installed in the installation grooves.

[0010] In a further embodiment, the drive mechanism comprises: A driving motor is mounted on one side of the rotary thread cutter; A driving wheel, fixed to the output shaft of the driving motor; A rotating roller is mounted on the vehicle body through a bracket; the rotating roller is fixedly connected to the center of the connecting end; The driven wheel is correspondingly mounted on the rotating roller; the driven wheel is connected to the driving wheel through a transmission belt.

[0011] In a further embodiment, the installation cavity comprises an installation cavity and an operation cavity which are interconnected; and the connector positioner comprises: A positioning cylinder is detachably mounted in the mounting cavity; a through hole is provided at the bottom of the positioning cylinder; A lifting cylinder is fixed in the operating cavity; A compression spring, one end of which is connected to the output end of the lifting cylinder; A positioning rod, one end of which is connected to the other end of the compression spring; the other end of the positioning rod passes through the through hole and is provided with a positioning protrusion.

[0012] In a further embodiment, it further includes: a guide member fixed at the other end of the positioning rod; the guide member includes: an umbrella-shaped connecting ring, and a ferrule fixed at the end of the connecting ring; the ferrule is adapted to the through hole.

[0013] The threading method using the portable steel bar straight thread threading machine as described above comprises the following steps: Threading machine reset: Select the positioning cylinder that matches the outer diameter of the steel bar to be processed and install it in the installation cavity. The cutter head of the rotating thread tool does not overlap with the positioning cylinder. Control the lifting cylinder to be in the ejection state. Define the coordinates of the current positioning bump as ; Correspondingly, the center coordinates of the positioning plate in the steel bar positioning mechanism are , the first clamping member and the second clamping member are separated from each other to form a clamping space; Loading the steel bars to be processed: passing the waiting end of the steel bars to be processed through the clamping space to reach the positioning cylinder and contact with the positioning protrusion until the compression spring is fully compressed and the first clamping member and the second clamping member gather together for positioning, which is a dynamic positioning mode; Cutting straight steel bar threads: While the driving mechanism controls the rotation of the rotary thread cutter, the rotary cylinder in the thread cutter assembly rotates the cutter handle at a predetermined speed. The cutter handle rotates under the action of the arc guide groove and the guide column, increasing the amount of cutter head cut until the current thread circle is cut; the cutter head returns to the initial state: there is no overlap between the cutter head and the positioning cylinder; Straight thread pitch generation: The drive cylinder controls the inner clamping plate to push out and further limit the steel bar to enter the solid positioning mode; according to the thread pitch , compress the lifting cylinder and rotate the forward and reverse motor at the same time, so that the coordinates of the current positioning bump are , the center coordinates of the positioning plate are , the compression spring is continuously in a fully compressed state, and the drive cylinder switches to a compressed state to enter dynamic positioning mode; This process is repeated to generate the straight thread and pitch of the steel bar.

[0014] Beneficial effects of the present invention: The present invention uses a portable straight thread threading machine to perform secondary processing on unqualified straight thread joints that have been used at any time at the construction site to ensure that the quality is all qualified. In addition, the steel bar positioning mechanism of the present invention is an open-type positioning, which is suitable for positioning steel bars with a certain length. The steel bars can be placed directly from the open place without the need for additional manual or mechanical (conditions do not allow: harsh environment, heavy steel bars) long-distance dragging, insertion and positioning. At the same time, the steel bar positioning mechanism of the present application provides a floating space in the X-axis direction for realizing the pitch generation required for straight thread threading.

[0015] In addition, the rotary thread cutter configured in the present invention has a rotatable cutter head, and the cutter head can adjust the cutting amount with the cooperation of other components to turn the required thread. In addition, the rotary thread cutter configured in the present invention is compatible with the steel bar positioning mechanism and has a connector positioner, which is not only used to ensure the stability of the steel bar during the threading process, but also to adapt to the pitch generation and work synchronously with the floating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of a portable straight thread cutting machine for steel bars.

[0017] Figure 2 It is a structural diagram of the steel bar positioning mechanism.

[0018] Figure 3 It is a structural diagram of a rotary thread tool.

[0019] Figure 4 It is a structural diagram of the thread cutter assembly.

[0020] Figure 5 It is a structural diagram of the connector locator.

[0021] Figure 6 This is the threading principle diagram of a portable steel bar straight thread threading machine.

[0022] Figures 1 to 5The labels in are: car body 1, steel bar positioning mechanism 2, rotary thread tool 3, driving mechanism 4, steel bar 5, floating assembly 201, clamping claw cylinder 202, first clamping plate 203, first positioning plate 204, second positioning plate 205, recessed surface 206, inner clamping plate 207, second clamping plate 208, mounting block 209, mounting groove 210, clamping wheel 211, bearing seat 201-a, threaded rod 201-b, positioning plate 201-c, tool holder 301, main body 302, threaded cutter assembly 303, positioning cylinder 304, lifting cylinder 305, compression spring 306, positioning rod 307, positioning protrusion 308, guide member 309, guide seat 303-a, arc guide groove 303-b, tool handle 303-c, tool head 303-d, guide column 303-e, connecting ring 309-a, ring 309-b. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Example 1 A portable steel bar straight threading machine comprises a body 1, wherein the body 1 has the freedom of movement; the length of the body 1 is defined as the X-axis direction, and the width is defined as the Y-axis direction. The body 1 has the freedom of movement through wheels, and a brake mechanism is provided on the corresponding wheels for stable operation.

[0025] like Figure 1 As shown, it also includes: a steel bar positioning mechanism 2 arranged at one end of the car body 1. In order to adapt to steel bars of different outer diameters, the steel bar positioning mechanism 2 of this embodiment has a positioning space with adjustable size. In a further embodiment, the steel bar positioning mechanism 2 also has a floating space of a predetermined length in the X-axis direction, and the floating space is used for the pitch generation below.

[0026] Correspondingly, the rotary thread cutter 3 is arranged opposite to the steel bar positioning mechanism 2 in the X-axis direction. Furthermore, the rotary thread cutter 3 has a rotational degree of freedom, and a connector positioner is arranged inside the rotary thread cutter 3; the connector positioner controls the reciprocating degree of freedom of the steel bar in the X-axis direction. In order to achieve full threading, the rotary thread cutter 3 is connected to the driving mechanism 4 in transmission. In other words, the driving mechanism 4 is the rotation power source of the rotary thread cutter 3.

[0027] In a further embodiment, the driving mechanism 4 comprises: a driving motor installed on one side of the rotary threaded tool 3, wherein a driving wheel is fixed on the output shaft of the driving motor. It also comprises: a rotating roller installed on the vehicle body 1 through a bracket, and the rotating roller is connected to the rotary threaded tool 3. Correspondingly, a driven wheel is also installed on the rotating roller, and the driven wheel is connected to the driving wheel through a transmission belt.

[0028] That is, the driving motor rotates to drive the driving wheel to rotate, and the driving wheel drives the driven wheel to rotate by the rotating belt, so that the rotary thread tool 3 connected to the driven wheel rotates.

[0029] Considering that the steel bars on the construction site have a certain weight and mass, if the steel bar positioning mechanism 2 is a non-open structure, it needs to be passed through and positioned manually or by another configuration mechanism, and it is relatively troublesome to disassemble. Therefore, this embodiment adopts an open steel bar positioning mechanism 2, that is, when transporting steel bars, the steel bars can be placed in the steel bar positioning mechanism 2 in one step and then positioned.

[0030] like Figure 2 As shown, the steel bar positioning mechanism 2 includes: a floating assembly 201 installed on the upper surface of the vehicle body 1, and a clamping cylinder 202 connected to the output end of the floating assembly 201. The clamping cylinder 202 in this embodiment is a clamping cylinder 202 in the prior art, which has two output ends and is not described in detail here.

[0031] The floating assembly 201 includes: a forward and reverse motor and a bearing seat 201-a adjacently arranged along the X-axis, a threaded rod 201-b is rotatably installed inside the bearing seat 201-a, and a positioning plate 201-c is connected to the threaded rod 201-b through a threaded transmission. A clamping cylinder 202 is installed on the positioning plate 201-c.

[0032] It also includes: a first clamping member and a second clamping member respectively arranged at two output ends of the clamping jaw cylinder 202. In a further embodiment, the working mode between the first clamping member and the second clamping member includes at least: a solid positioning mode and a dynamic positioning mode. The solid positioning mode is used for threading, and the dynamic positioning mode is used for pitch generation. The corresponding positioning mode is selected based on two different processing states to meet the decomposition of friction or other forces during processing.

[0033] The implementation structures of the above two positioning modes are as follows: the first clamping member includes: a first clamping plate 203 connected to the output end of the clamping claw cylinder 202, and a first positioning plate 204 and a second positioning plate 205 are vertically fixed to the two end surfaces of the first clamping plate 203 along the Y axis. In order to better clamp the steel bars, the clamping surfaces of the first positioning plate 204 and the second positioning plate 205 of this embodiment are both concave surfaces 206 according to the surface characteristics of the steel bars.

[0034] It also includes: a driving cylinder vertically installed on the outer side of the first clamping plate 203 along the Y axis, the output end of the driving cylinder is located between the first positioning plate 204 and the second positioning plate 205 and is drivingly connected to the inner clamping plate 207. In other words, the inner clamping plate 207 is located between the first positioning plate 204 and the second positioning plate 205.

[0035] The second clamping member includes: a second clamping plate 208 connected to the output end of the clamping cylinder 202. The second clamping plate 208 is connected to a mounting block 209, and the clamping surface of the mounting block 209 is provided with at least two groups of mounting grooves 210; each group of mounting grooves 210 is correspondingly installed with a clamping wheel 211.

[0036] It can be further understood that when the connecting end of the steel bar is in the threading stage, the external force on the steel bar is the pressure given by the cutter head 303-d, and at this time, the driving cylinder and the inner clamping plate 207 are in a compressed state, that is, there is no contact between the inner clamping plate 207 and the steel bar. Therefore, the steel bar can decompose the force to the corresponding pressure wheel 211 and the roller bearing by shaking slightly, so as to reduce the overall shaking and ensure the stability and accuracy of threading.

[0037] When the steel bar needs to move a short distance to generate the pitch, the inner clamping plate 207 needs to be pushed out by the driving cylinder so that the driving cylinder presses the steel bar to increase the friction force to achieve short-distance clamping movement, which is a dynamic positioning mode.

[0038] In another embodiment, in combination Figure 3 The rotary thread cutter 3 includes: a cutter holder 301, including: a base, a body 302 connected to the base, and a mounting cavity opened inside the body 302. The base has a connection end, which is configured to be transmission-connected to the drive mechanism 4, such as the rotating roller in the drive mechanism 4 mentioned above. The mounting cavity is configured to install the connector locator. Furthermore, it also includes three groups of thread cutter assemblies 303 distributed in the body 302 at a predetermined distance. The uniform distribution is considered to ensure that the force of the steel bar is balanced when the cutter head 303-d acts on the steel bar, thereby improving the accuracy.

[0039] like Figure 4 As shown, the thread cutter assembly 303 includes: a guide seat 303-a installed in the body 302, and an arc-shaped guide groove 303-b is provided on the guide seat 303-a. A tool handle 303-c is movably mounted in the guide seat 303-a, and a guide column 303-e is provided on one side of the tool handle 303-c, and the guide column 303-e is adapted to the arc-shaped guide groove 303-b.

[0040] A rotary cylinder is provided below the guide seat 303-a, and the bottom of the tool handle 303-c is rotatably connected to the rotary rod of the rotary cylinder. Correspondingly, a cutter head 303-d is fixedly installed on the top of the tool handle 303-c. The cutter head 303-d, driven by the rotary cylinder, combines the arc guide groove 303-b and the guide column 303-e to adjust the amount of cut-in. Therefore, the arc guide groove 303-b in this embodiment is horizontally opened. Under the action of the rotary cylinder, the tool handle 303-c rotates along the arc guide groove 303-b to change the distance between the head of the cutter head 303-d and the center of the installation cavity to adjust the amount of cut-in.

[0041] Similarly, in order to ensure stability, the steel bar connector is positioned at the cutter head 303-d by a connector positioner. In order to be applicable to steel bars of different sizes, the present embodiment makes the following improvements: First, as shown in the figure, the installation cavity includes an installation cavity and an operation cavity that are interconnected. The connector positioner includes: a positioning cylinder 304 that is detachably installed in the installation cavity, wherein the bottom of the positioning cylinder 304 is provided with a through hole. The purpose of being detachable is to enable the replacement of positioning cylinders 304 with different inner diameters to meet steel bars of different requirements.

[0042] Furthermore, a lifting cylinder 305 is fixed in the operating cavity, and the output end of the lifting cylinder 305 is connected to a compression spring 306 , and the other end of the compression spring 306 is connected to a positioning rod 307 , and the top of the positioning rod 307 passes through the through hole and is provided with a positioning protrusion 308 .

[0043] In this embodiment, a compression spring 306 is added between the positioning rod 307 and the lifting gas rod to play a buffering role when pressure is applied to the steel bar joint, and also to play a damping effect during threading.

[0044] Considering the instability of the compression spring 306, a guide member 309 is fixed on the top of the positioning rod 307. The guide member 309 includes: an umbrella-shaped connecting ring 309-a, and a ring 309-b fixed at the end of the connecting ring 309-a; the ring 309-b is adapted to the through hole. In other words, the combination of the ring 309-b and the through hole plays a guiding role to ensure that the movement will not deviate.

[0045] Example 2 Based on the portable steel bar straight threading machine disclosed in Example 1, this embodiment discloses a threading method of the portable steel bar straight threading machine, combined with Figure 6 The following steps are involved: Threading machine reset: Select the positioning cylinder that matches the outer diameter of the steel bar to be processed and install it in the installation cavity. The cutter head of the rotating thread tool does not overlap with the positioning cylinder. Control the lifting cylinder to be in the ejection state. Define the coordinates of the current positioning bump as ; Correspondingly, the center coordinates of the positioning plate in the steel bar positioning mechanism are , the first clamping member and the second clamping member are separated from each other to form a clamping space; Loading the steel bars to be processed: passing the waiting end of the steel bars to be processed through the clamping space to reach the positioning cylinder and contact with the positioning protrusion until the compression spring is fully compressed and the first clamping member and the second clamping member gather together for positioning, which is a dynamic positioning mode; Cutting straight steel bar threads: While the driving mechanism controls the rotation of the rotary thread cutter, the rotary cylinder in the thread cutter assembly rotates the cutter handle at a predetermined speed. The cutter handle rotates under the action of the arc guide groove and the guide column, increasing the amount of cutter head cut until the current thread circle is cut; the cutter head returns to the initial state: there is no overlap between the cutter head and the positioning cylinder; Straight thread pitch generation: The drive cylinder controls the inner clamping plate to push out and further limit the steel bar to enter the solid positioning mode; according to the thread pitch , compress the lifting cylinder and rotate the forward and reverse motor at the same time, so that the coordinates of the current positioning bump are , the center coordinates of the positioning plate are , the compression spring is continuously in a fully compressed state, and the drive cylinder switches to a compressed state to enter dynamic positioning mode; This process is repeated to generate the straight thread and pitch of the steel bar.

Claims

1. A portable steel bar straight threading machine, comprising a body, the body having a degree of freedom of movement; the length of the body is defined as the X-axis direction, and the width is defined as the Y-axis direction; characterized in that: Also includes: A steel bar positioning mechanism is provided at one end of the vehicle body; the steel bar positioning mechanism has a positioning space with adjustable size and a floating space with a predetermined length in the X-axis direction; The rotary thread tool is arranged opposite to the steel bar positioning mechanism in the X-axis direction; the rotary thread tool has a rotational degree of freedom, and a connector positioner is arranged inside the rotary thread tool; the connector positioner controls the reciprocating degree of freedom of the steel bar in the X-axis direction; A driving mechanism is transmission-connected to the rotating thread tool.

2. A portable steel bar straight threading machine according to claim 1, characterized in that: The steel bar positioning mechanism comprises: A floating assembly mounted on the upper surface of the vehicle body; A clamping claw cylinder, drivingly connected to the output end of the floating assembly; The first clamping member and the second clamping member are respectively arranged at two output ends of the clamping cylinder; the working modes between the first clamping member and the second clamping member at least include: a solid positioning mode and a dynamic positioning mode.

3. A portable steel bar straight threading machine according to claim 1, characterized in that: The rotary thread tool comprises: The tool holder comprises: a base, a body connected to the base, and a mounting cavity opened inside the body; the base has a connecting end, which is configured to be transmission-connected to the driving mechanism, and the mounting cavity is configured to install the connector locator; At least one set of thread cutter assemblies is distributed in the body at a predetermined distance; the thread cutter assemblies include: A guide seat is correspondingly installed in the body; an arc-shaped guide groove is provided on the guide seat; A knife handle is movably sleeved in the guide seat; a guide column is provided on one side of the knife handle, and the guide column is adapted to the arc-shaped guide groove; A rotary cylinder is arranged below the guide seat; the bottom of the tool handle is rotatably connected to a rotary rod of the rotary cylinder; The cutter head is fixedly mounted on the top of the cutter handle; the cutter head is driven by a rotary cylinder and is combined with an arc guide groove and a guide column to adjust the cutting amount.

4. A portable steel bar straight threading machine according to claim 2, characterized in that: The floating assembly comprises: The forward and reverse motors and the bearing seat are arranged adjacent to each other along the X-axis; A threaded rod rotatably mounted in the bearing seat; The positioning plate is connected to the threaded rod through threaded transmission; the threaded rod is configured to fix the clamping jaw cylinder.

5. The portable steel bar straight threading machine according to claim 2, characterized in that: The first clamping member comprises: A first clamping plate is configured to be connected to the clamping jaw cylinder; The first positioning plate and the second positioning plate are vertically fixed to the two end surfaces of the first clamping plate along the Y-axis; the clamping surfaces of the first positioning plate and the second positioning plate are both concave surfaces; A driving cylinder is vertically mounted on the outer side of the first clamping plate along the Y-axis direction; The inner clamping plate is arranged between the first positioning plate and the second positioning plate and is transmission-connected to the output end of the driving cylinder.

6. A portable steel bar straight threading machine according to claim 2, characterized in that: The second clamping member comprises: A second clamping plate is configured to be connected to the clamping jaw cylinder; A mounting block connected to the second clamping plate; a clamping surface of the mounting block is provided with at least two sets of mounting grooves; A plurality of clamping wheels are correspondingly installed in the installation grooves.

7. The portable steel bar straight threading machine according to claim 3, characterized in that: The driving mechanism comprises: A driving motor is mounted on one side of the rotary thread cutter; A driving wheel, fixed to the output shaft of the driving motor; A rotating roller is mounted on the vehicle body through a bracket; the rotating roller is fixedly connected to the center of the connecting end; The driven wheel is correspondingly mounted on the rotating roller; the driven wheel is connected to the driving wheel through a transmission belt.

8. The portable steel bar straight threading machine according to claim 3, characterized in that: The installation cavity includes an installation cavity and an operation cavity which are interconnected; the connector positioner includes: A positioning cylinder is detachably mounted in the mounting cavity; a through hole is provided at the bottom of the positioning cylinder; A lifting cylinder is fixed in the operating cavity; A compression spring, one end of which is connected to the output end of the lifting cylinder; A positioning rod, one end of which is connected to the other end of the compression spring; the other end of the positioning rod passes through the through hole and is provided with a positioning protrusion.

9. The portable steel bar straight threading machine according to claim 8, characterized in that: Also includes: A guide member fixed at the other end of the positioning rod; the guide member comprises: an umbrella-shaped connecting ring, and a ferrule fixed at the end of the connecting ring; The ferrule is adapted to fit into the through hole.

10. A threading method using the portable steel bar straight threading machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: Threading machine reset: Select the positioning cylinder that matches the outer diameter of the steel bar to be processed and install it in the installation cavity. The cutter head of the rotating thread tool does not overlap with the positioning cylinder. Control the lifting cylinder to be in the ejection state. Define the coordinates of the current positioning bump as ; Correspondingly, the center coordinates of the positioning plate in the steel bar positioning mechanism are , the first clamping member and the second clamping member are separated from each other to form a clamping space; Loading the steel bars to be processed: passing the waiting end of the steel bars to be processed through the clamping space to reach the positioning cylinder and contact with the positioning protrusion until the compression spring is fully compressed and the first clamping member and the second clamping member gather together for positioning, which is a dynamic positioning mode; Cutting straight steel bar threads: While the driving mechanism controls the rotation of the rotary thread cutter, the rotary cylinder in the thread cutter assembly rotates the cutter handle at a predetermined speed. The cutter handle rotates under the action of the arc guide groove and the guide column, increasing the cutting amount of the cutter head until the current thread circle is cut. The cutter head returns to its initial state: there is no overlap between the cutter head and the positioning tube; Straight thread pitch generation: The drive cylinder controls the inner clamping plate to push out and further limit the steel bar to enter the solid positioning mode; according to the thread pitch , compress the lifting cylinder and rotate the forward and reverse motor at the same time, so that the coordinates of the current positioning bump are , the center coordinates of the positioning plate are , the compression spring is continuously in a fully compressed state, and the drive cylinder switches to a compressed state to enter dynamic positioning mode; This process is repeated to generate the straight thread and pitch of the steel bar.

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