CN108788329A - A kind of machine for cutting thread for steel bar - Google Patents

Abstract

The invention discloses a steel bar thread processing machine, comprising: a main motor, a reducer, a spindle box, a machine head, a feed mechanism, a guide rod, a vise, a knife opening mechanism, a frame and an automatic control system; a vise, a guide Both the rod and the reducer are fixed on the frame, and the reducer is set as a parallel shaft reducer, and the output shaft of the reducer is set as a spline shaft; the main shaft is connected with the spline shaft through the first coupling; the main motor and the reducer connection; the feed mechanism is arranged in parallel under the spline shaft, and is used to push the machine head to move axially; the automatic control system is electrically connected with the feed mechanism and the reducer. The invention discloses a steel bar thread processing machine, which has better processing precision, higher production efficiency and lower maintenance and use cost, is especially suitable for large-volume steel bar thread processing production lines, and has broad market prospects.

Description

A steel bar threading machine

technical field

The invention relates to the technical field of building construction equipment, and more specifically relates to a steel bar thread processing machine.

Background technique

In modern concrete structure buildings, steel sleeve threaded connection is one of the most important steel bar connection methods. The method is to process straight threads or tapered threads at the ends of the steel bars, and then use a connecting sleeve processed with corresponding internal threads to connect two steel bars together, which has fast connection, good performance and wide application. The processing of steel bar connection threads is usually carried out at the engineering construction site or the steel bar processing site of the prefabricated component factory, and is completed by using a special steel bar thread processing machine.

The steel bar thread processing machine includes a main motor, a reducer, a machine head, a machine base, a feed mechanism, a guide rod or a slide rail, a cooling system, a steel bar clamping vise, and a frame. Domestic steel bar thread processing machines have been used for nearly 30 years, but there are still some shortcomings in the products on the market:

First of all, the machine base and the reducer base are integrated or combined into one, the main motor is directly connected to the reducer or installed on the machine base and indirectly connected to the reducer, the output shaft of the reducer is installed with the main shaft of the machine head, and the main motor is installed on the main shaft. The head and machine base are installed on the guide rod or slide rail. When processing steel bar threads, the feed mechanism pushes the machine base to drive the machine head, reducer, main motor, etc. to move longitudinally along the guide rod or slide rail. The moving speed of the machine head Depending on the driving force provided by the feed mechanism, no matter whether the feed mechanism is manually driven or the hydraulic and pneumatic assist device is used to drive the feed mechanism, the feed driving force is not related to the pitch of the thread to be processed. Only when the threading tool or thread rolling wheel After a section of thread is processed on the steel bar, the formed thread interacts with the cutter or the thread rolling wheel, so that the machine head continues to advance according to the pitch of the processed formed thread. Therefore, the thread processed by this steel thread processing machine is greatly affected by the driving force of the feed mechanism, and it is difficult to manufacture threads that truly meet the design accuracy requirements. The equipment that is completely manually driven has high labor intensity and poor thread accuracy; However, the reducer that forms a mechanical linkage structure between the rotation of the machine head and the screw, although the distance that the machine head rotates forward is related to the pitch of the linked screw, avoids the influence of manual or mechanically assisted driving force on the thread processing accuracy of the machine head, but Threads with different pitches require the use of screws with corresponding pitches. Therefore, when the pitch of the steel bar is changed, the linkage screw needs to be replaced. The production efficiency is low, and the wear of the screw has a direct impact on the machining accuracy of the steel bar thread.

Secondly, the steel bar thread processing machine adopts a reducer with the input shaft and output shaft on the same axis. The coolant in the cooling system enters the center hole of the main shaft through the radial hole of the head spindle installed on the output shaft of the reducer, and then enters the machine head. If the center hole lubricates and cools the threading tool and the thread head of the steel bar, when the coolant of the main shaft of the machine head enters the hole, the annular sealing ring on both sides of the hole and the main shaft will accumulate fine iron filings and iron chips brought by the circulating coolant. Chips will cause wear and tear on the spindle and seals to cause coolant leakage, damage adjacent parts, cause higher maintenance frequency of equipment, reduce effective working time and increase the processing cost of steel thread.

The structural design defects of these steel thread processing machines have seriously restricted the improvement of steel thread processing accuracy and production efficiency. We should strive to improve the quality of construction projects in our country, and improving the technology and quality level of construction equipment is to complete this. The basic work of the task.

Therefore, how to provide a steel bar threading machine with good machining accuracy and high production efficiency is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides a steel bar thread processing machine, which not only ensures high processing precision of the steel bar thread, improves work efficiency, but also prolongs the service life of the processing machine and reduces production costs.

In order to achieve the above object, the present invention adopts the following technical solutions:

A steel bar thread processing machine, comprising: a main motor, a reducer, a machine head, a tool holder, a main shaft, a first coupling, a spline shaft, a main shaft box, a guide rod, a feed mechanism, a vise, a frame and an automatic control system; the vise, the reducer and the guide rod are all fixed on the frame; the main motor is connected to the reducer; the reducer is set as a parallel shaft reducer, and The output shaft of the reducer is set as a spline shaft; the spline shaft can slide along the axis of the output shaft of the reducer; a tool seat and a tool for processing steel bars are installed on the head, and the head is installed On the main shaft supported by the headstock, the main shaft is connected with the spline shaft through a first coupling; the feed mechanism is arranged in parallel below the spline shaft and is used to push the main shaft The box moves axially, and the spindle box drives the machine head to move along the axis; the automatic control system is electrically connected to the reducer and the feeding mechanism.

Preferably, the headstock is supported on the frame by a pair of guide rods, and can slide along the axis of the guide rods; the axis of the guide rods is parallel to the axis of the spline shaft; the spline The shaft is set as a hollow spline shaft with a through hole in the center.

Preferably, it also includes a cooling liquid circulation system, the cooling liquid circulation system includes a cooling liquid water pipe, the cooling liquid water pipe is arranged in the central through hole of the spline shaft, and the front end of the cooling liquid water pipe is arranged at the In the center hole of the machine head, the rear end of the coolant water pipe protrudes beyond the end of the spline shaft away from the machine head end.

Preferably, the feed mechanism includes: a servo motor, a servo motor reducer, a lead screw, a second coupling and a lead screw nut, one end of the lead screw is installed in a fixed bearing seat, and the other end is installed in a support bearing In the seat; the fixed bearing seat and the supporting bearing seat are fixed on the frame; the servo motor is connected to the servo motor reducer, and the output shaft of the servo motor reducer is on the fixed bearing The seat is connected with the lead screw through the second coupling; the lead screw nut is mated with the lead screw and fixedly connected with the headstock. After the servo motor is decelerated by the servo motor reducer, it accurately drives the screw to rotate clockwise or counterclockwise. The rotation of the screw pushes the screw sleeve and the spindle box to drive the machine head to move along the axis of the spline shaft, thereby realizing The advance or retreat of the machine head completes the precise travel of the machine head and realizes the processing of steel thread.

Preferably, the front end of the coolant water pipe placed in the central hole of the machine head is provided with a steel bar positioning rod, and the steel bar positioning rod corresponds to the thread length of the steel bar to be processed. The end positioning of the steel bar to be processed is realized by the steel bar positioning rod, so as to ensure the processing accuracy of the thread length of the steel bar.

Preferably, it also includes a knife opening mechanism, the knife opening mechanism includes a hydraulic cylinder and a knife opening ring, the knife opening ring is arranged outside the machine head for controlling the opening and closing of the tool seat, and the knife opening ring The action is controlled by the hydraulic cylinder.

Preferably, the vise is set as an automatic clamping mechanism that is driven by the hydraulic cylinder and clamps the steel bars through a pair of clamps that move in parallel.

Preferably, the coolant water pipe extends to the rear end of the spline shaft away from the end of the machine head, and is fixed on the machine frame or the reducer through a water pipe bracket.

Preferably, the automatic control system includes a driving pulley, a synchronous belt, a driven pulley, an encoder and a control unit, the driving pulley is installed on the spline shaft, and the driven pulley passes through the The synchronous belt is connected to the driving pulley, the encoder is connected to the driven pulley, and is electrically connected to the control unit. The driving pulley drives the driven pulley to rotate, the encoder detects the rotation parameters of the driven pulley and transmits it to the control unit, and the control unit controls the moving speed of the servo motor according to the detection result. For the processing of threads with different pitches, it is only necessary to design the driver parameters of the servo motor on the control unit, which is simple and convenient. Not only the labor intensity of the operator is greatly reduced, but also the overall cost of equipment manufacturing and maintenance is reduced, and the effective work of the equipment is greatly improved. Time, improve production efficiency, and significantly reduce the processing cost of steel thread.

Preferably, the hydraulic cylinder is driven and controlled by a hydraulic pump provided with a solenoid valve or an electro-hydraulic valve; the hydraulic pump is electrically connected to the automatic control system.

It can be seen from the above-mentioned technical solutions that, compared with the prior art, a steel bar threading machine disclosed in the present invention uses a parallel shaft reducer, and the reducer and the main motor are fixed on the frame, and at the output end of the reducer The axially movable spline shaft is used to provide rotational power to the machine head through the spline shaft, and at the same time, the feed mechanism driven by the servo motor drives the main shaft, machine head, headstock, and spline shaft to move longitudinally along the guide rod. The beneficial effects are:

First, it greatly reduces the load of the feed mechanism to drive the moving parts forward, improves the durability and service life of the power mechanism and feed mechanism, and reduces the processing cost of the thread;

Second, the servo motor-driven feed mechanism controlled by the automatic control system realizes the precise control of matching the longitudinal movement of the machine head and the rotation of the machine head, so that the thread processing accuracy of the steel bar thread processing machine can be improved to the precision of high-precision industrial machine tools Level;

Third, the cooling liquid circulation system sends the cooling liquid from the hollow spline output shaft of the reducer to the center hole of the machine head, so that the cooling liquid is completely isolated from the mechanical parts such as the main shaft of the machine head, which not only avoids damage to the mechanical parts, but also directly sends the cooling liquid The working pressure is high, the effect of cooling the machining tool and washing the cutting iron chips is good, which improves the quality of thread processing, reduces the loss of tools, and saves the cost of thread processing;

Fourth, the automatic control system controls and drives the knife opening mechanism, the opening and closing time of the knife is more precise, the action is more reliable, and the parts loss of the knife opening mechanism is less, which further improves the thread processing accuracy;

Fifth, the vise controlled and driven by the automatic control system automates the clamping work of the steel bar, reduces the labor intensity of the operator, improves labor productivity, and reduces the cost of thread processing;

Sixth, the steel bar to be processed is pushed against the end of the positioning rod fixed on the coolant water pipe before the vise is clamped, which can realize the precise longitudinal position of the processed steel bar, the positioning method is simple, and the precision is high. It also improves the thread processing accuracy and production efficiency. contribute.

It can be seen that the steel bar thread processing machine disclosed in the present invention has better processing accuracy, higher production efficiency and lower maintenance and use costs, is especially suitable for large-volume steel bar thread processing production lines, and has broad market prospects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Accompanying drawing of Fig. 1 is the front view that the present invention provides.

Accompanying drawing of Fig. 2 is B-B sectional view provided by the present invention.

The accompanying drawing of Fig. 3 is a top view provided by the present invention.

Figure 4 is a sectional view of the feeding mechanism provided by the present invention.

Figure 5 is a side view provided by the present invention.

Among them, 1 is the main motor, 2 is the reducer, 3 is the machine head, 4 is the feeding mechanism, 5 is the vise, 6 is the knife mechanism, 7 is the frame, 8 is the hollow spline shaft, and 9 is the coolant Water pipe, 10 is the first coupling, 11 is the automatic control system, 12 is the main shaft, 13 is the guide rod, 14 is the tool seat, 15 is the spindle box, 16 is the knife ring, 17 is the servo motor, 18 is the servo motor Reducer, 19 is a leading screw, 20 is a fixed bearing seat, 21 is a support bearing seat, 22 is a steel bar positioning rod, 23 is a driving pulley, 24 is a synchronous belt, 25 is a driven pulley, 26 is an encoder, 27 For the screw sleeve, 28 is the second shaft coupling.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention discloses a steel thread processing machine, including 1, a main motor 1, a reducer 2, a machine head 3, a tool holder 14, a main shaft 12, a first coupling 10, a spline shaft 8, and a main shaft box 15 , guide rod 13, feed mechanism 4, vise 5, frame 7 and automatic control system 11; vise 5, reducer 2 and guide rod 13 are all fixed on the frame 7; main motor 1 is connected with reducer 2 The reducer 2 is set as a parallel shaft reducer, and the output shaft of the reducer 2 is set as a spline shaft 8; the spline shaft 8 can slide along the axis of the output shaft of the reducer 2; a tool for processing steel bars is installed on the machine head 3 Seat 14 and cutting tool, machine head 3 are installed on the main shaft 12 that is supported by headstock 15; A pair of guide rods 13 whose axes are parallel to the axis of the spline shaft 8 are fixed on the frame 7; the headstock 15 is supported by the guide rods 13 and can slide along the axis of the guide rods 13; the feed mechanism 4 is arranged in parallel on the spline The bottom of the key shaft 8 is used to push the spindle box 15 to move axially, and then the spindle box 15 drives the machine head 3 to move along the axis; the automatic control system 11 is electrically connected with the reducer 2 and the feed mechanism 4 .

The reducer 2 is fixed on the frame 7, the spline shaft 8 is set as a hollow spline shaft with a through hole in the center, and the two ends of the spline shaft 8 protrude from the output end of the reducer respectively. The key shaft 8, the first coupling 10 and the main shaft 12 provide rotational force to the machine head 3, so that the only moving parts are: the machine head 3, the main shaft 12, the headstock 15, the first coupling 10 and the hollow spline shaft 8 , the total weight of the moving mechanical parts is light, which greatly reduces the load of the feed mechanism 4 driving the head 3 forward, reduces the motion inertia of the feed mechanism, improves the system life, and reduces the processing cost of the steel thread.

In order to further optimize the above-mentioned technical solution, it also includes a cooling liquid circulation system, the cooling liquid circulation system includes: a cooling liquid water pipe 9, the cooling liquid water pipe 9 is arranged in the central through hole of the spline shaft 8, and the front end of the cooling liquid water pipe 9 is arranged In the central hole of the machine head 3 , the rear end of the coolant water pipe 9 protrudes beyond the end of the spline shaft 8 away from the end of the machine head 3 . By inserting the coolant water pipe 9 into the center hole of the spline shaft 8 of the reducer 2, not only can the cooling water be completely rushed to the cutting tool, the cooling effect is good, but also the metal chips cut from the processed steel thread are prevented from rushing into the inside of the machine head , the random head 3 rotates and falls between the cutting knife and the processed steel thread, thereby ensuring the forming quality of the thread and improving the processing accuracy of the thread.

In order to optimize the above-mentioned technical scheme further, feed mechanism 4 comprises: servomotor 17, servomotor speed reducer 18, leading screw 19, second coupling 28 and leading screw nut 27, and one end of leading screw 19 is installed on fixed bearing In the seat 20, the other end is installed in the support bearing seat 21, the fixed bearing seat 20 and the support bearing seat 21 are all fixed on the frame 7; the feed mechanism 4 is stationary relative to the frame 7, and the leading screw 19 rotates, pushing The axial movement of the main shaft box 15; the servo motor 17 is connected with the servo motor reducer 18, and the output shaft of the servo motor reducer 18 is connected with the lead screw 19 through the second coupling 28 in the fixed bearing seat 20; 27 is matched with the lead screw 19 and fixedly connected with the headstock 15, and the headstock 15 is pushed along with the rotation of the lead screw 19 to drive the machine head 3 to move along the axis of the spline shaft 8. The servo motor 17 drives the lead screw 19 to rotate clockwise or counterclockwise after being decelerated by the servo motor reducer 18, and the rotation of the lead screw pushes the lead screw sleeve 27 and the headstock 19 to drive the machine head 3 along the axis of the spline shaft 8 Move, thereby realizing the advance or retreat of the machine head 3, completing the precise travel of the machine head 3, and realizing the processing of steel thread.

In order to further optimize the above technical solution, the front end of the coolant water pipe 9 placed in the inner hole of the machine head 3 is provided with a steel bar positioning rod 22, and the steel bar positioning rod 22 corresponds to the thread length of the steel bar to be processed. The positioning of the reinforcing bar is realized by the reinforcing bar positioning rod 22 to ensure the processing accuracy of the thread of the reinforcing bar.

In order to further optimize the above-mentioned technical scheme, it also includes a knife opening mechanism 6, which includes a hydraulic cylinder and a knife opening ring 16, and the knife opening ring 16 is arranged on the outside of the machine head 3 for controlling the opening and closing of the tool seat 14, and the knife opening mechanism 6 includes a hydraulic cylinder and a knife opening ring 16. The movement of the ring 16 is controlled by hydraulic cylinders.

In order to further optimize the above-mentioned technical solution, the vise 5 is set as an automatic clamping mechanism driven by a hydraulic cylinder to clamp a steel bar through a pair of clamps that move in parallel to each other.

In order to further optimize the above technical solution, the coolant water pipe 9 protrudes to the rear end of the spline shaft 8 away from the end of the machine head 3, and is fixed on the frame 7 or the reducer 2 through the water pipe bracket. The coolant water pipe 9 is inserted into the center hole of the spline shaft 8, which avoids the damage of the system parts caused by the damage of the sealing system, thereby reducing the cost of equipment maintenance and use; the automatic clamping mechanism enables the production and processing of steel bars to be fully automated, which significantly improves the processing and production Efficiency, reduce threading cost.

In order to further optimize the above technical scheme, the automatic control system 11 includes a driving pulley 23, a synchronous belt 24, a driven pulley 25, an encoder 26 and a control unit, the driving pulley 23 is installed on the spline shaft 8, and the driven belt The pulley 25 is connected to the driving pulley 23 through the synchronous belt 24, the encoder 26 is connected to the driven pulley 25, and is electrically connected to the control unit. The control unit is set as PLC, the driving pulley drives the driven pulley to rotate, the encoder detects the rotation parameters of the driven pulley and transmits it to the PLC, and the PLC controls the moving speed of the servo motor according to the detection result. For processing threads with different pitches, it is only necessary to design the driver parameters of the servo motor on the PLC, which is simple and convenient, not only greatly reduces the labor intensity of the operator, but also reduces the overall cost of equipment manufacturing and maintenance, and greatly improves the effective working time of the equipment. , Improve production efficiency and significantly reduce the processing cost of steel thread.

In order to further optimize the above technical solution, the hydraulic cylinder is driven and controlled by a hydraulic pump equipped with a solenoid valve or an electro-hydraulic valve; the hydraulic pump is electrically connected to the automatic control system 11 .

The working process of a steel bar thread processing machine disclosed by the present invention is as follows: firstly, connect the equipment circuit and the hydraulic oil circuit system, start the equipment automatic control system 11, insert the steel bar into the vise jaw, and push the end of the steel bar against the steel bar positioning rod 22, press the steel bar clamping control button, start the automatic clamping mechanism to clamp the steel bar, then press the steel bar processing button, start the main motor 1, the main motor 1 drives the parallel shaft reducer 2 to rotate, and the power output by the reducer 2 passes through The spline shaft 8 at the output end, the first coupling 10, and the main shaft 12 are sent to the machine head 3, and the machine head 3 is equipped with a steel bar processing tool seat and tool rotation; On the frame 7, a lead screw 19 driven by a servo motor 17 is arranged in parallel below the spline shaft 8. When the machine head 3 rotates, the synchronously rotating spline shaft 8 drives the driving pulley 23 to rotate, and the driving pulley 23 passes through the synchronous The belt 23 drives the driven pulley 25 to rotate, and the encoder 26 records the rotation parameter data of the driven pulley 25 and transmits it to the automatic control system 11. The PLC of the automatic control system 11 controls the rotation of the servo motor 17, and the servo motor 17 passes through the servo motor. After the reducer 18 decelerates, the screw 19 is driven to rotate clockwise or counterclockwise precisely. The rotation of the screw pushes the screw sleeve 27 and the spindle box 15 to drive the machine head 3 to move along the axis of the spline shaft 8, thereby realizing the 3 advances or retreats according to the setting value of the automatic control system 11, and completes the precise advance on the axis during the rotation of the machine head 3, and realizes the precise machining of the steel thread; after the steel thread of the specified length is processed, the program is set by the PLC A signal is sent to start the knife-opening mechanism 6, and the knife-opening mechanism 6 pushes the knife-opening ring 16 to move, so that the steel bar processing tool holder and the tool realize the knife-opening action, and then the PLC controls the reverse rotation of the servo motor 17 to return the machine head 3 to the set position. At the same time, the knife opening mechanism 6 returns to its original position, the automatic clamping mechanism of the steel bar clamp is released, the automatic control system sends out a signal, the reducer 2 stops rotating, the machine head 3 stops rotating, and the processed steel bar is removed, a steel bar The thread processing is completed.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of machine for cutting thread for steel bar, which is characterized in that including：Main motor (1), speed reducer (2), head (3), the base of tool (14), main shaft (12), first shaft coupling (10), splined shaft (8), spindle box (15), guide rod (13), feed mechanism (4), vice (5), rack (7) and automatic control system (11)；

The vice (5), the speed reducer (2) and the guide rod (13) are both secured in the rack (7)；

The main motor (1) connect with the speed reducer (2)；

The speed reducer (2) is provided parallel to axis speed reducer, and the output shaft of the speed reducer (2) is set as splined shaft (8)；Institute Stating splined shaft (8) can slide along the output shaft axis of the speed reducer (2)；

The base of tool (14) and cutter of screwing steel bars are installed, the head (3) is mounted on by the main shaft on the head (3) On the main shaft (12) of case (15) support；The main shaft (12) is connect by first shaft coupling (10) with the splined shaft (8)；

The feed mechanism (4) is arranged in parallel in the lower section of the splined shaft (8), for pushing the spindle box (15) axially to move It is dynamic, and then drive the head (3) to be moved along axis by spindle box (15)；

The automatic control system (11) is electrically connected with the speed reducer (2) and the feed mechanism (4).

2. a kind of machine for cutting thread for steel bar according to claim 1, which is characterized in that the spindle box (15) passes through a pair Guide rod (13) is supported in the rack (7), and can be slided along the guide rod (13) axis；The axis of the guide rod (13) is flat Row is in the axis of the splined shaft (8)；The hollow splined shaft of through-hole is equipped with centered on splined shaft (8) setting.

3. a kind of machine for cutting thread for steel bar according to claim 2, which is characterized in that further include coolant circulation system, The coolant circulation system includes coolant liquid water pipe (9), and the coolant liquid water pipe (9) is set in the splined shaft (8) In heart through-hole, and the front end of the coolant liquid water pipe (9) is arranged in the centre bore of the head (3), the coolant liquid water pipe (9) rear end is stretched out other than end of the splined shaft (8) far from the head (3) end.

4. a kind of machine for cutting thread for steel bar according to claim 2, which is characterized in that the feed mechanism (4) includes：It watches Take motor (17), speed reducer for servo motor (18), leading screw (19), second shaft coupling (28) and leading screw swivel nut (27), the leading screw (19) one end is mounted in fixed bearing block (20), and the other end is installed in supporting bearing base (21)；The fixed bearing block (20) it is both secured in the rack (7) with the supporting bearing base (21)；The servo motor (17) and the servo motor Speed reducer (18) connects, and the output shaft of the speed reducer for servo motor (18) passes through described the in the fixed bearing block (20) Two shaft couplings (28) are connect with the leading screw (19)；The leading screw swivel nut (27) and the leading screw (19) are connected, and with institute It states spindle box (15) to be fixedly connected, and as the rotation of the leading screw (19) pushes the spindle box (15) to drive head (3) Axis along the splined shaft (8) moves.

5. a kind of machine for cutting thread for steel bar according to claim 3, which is characterized in that be placed in the head (3) centre bore The forward end of interior coolant liquid water pipe (9) is provided with reinforcing bar locating rod (22), and the reinforcing bar locating rod (22) with it is to be processed Screw thread steel length is corresponding.

6. a kind of machine for cutting thread for steel bar according to claim 1, which is characterized in that further include a cutter mechanism (6), it is described It includes hydraulic cylinder and a knife ring (16) to open cutter mechanism (6), and described knife ring (16) setting is used to control on the outside of the head (3) The folding of the base of tool (14), the action of described knife ring (16) are controlled by the hydraulic cylinder.

7. a kind of machine for cutting thread for steel bar according to claim 1, which is characterized in that the vice (5) is set as by institute Driven by Hydraulic Cylinder is stated, the automatic clamping mechanism for the fixture clamping reinforcing bar that a pair moves in parallel in opposite directions is passed through.

8. according to a kind of machine for cutting thread for steel bar of claim 3-7 any one of them, which is characterized in that the coolant liquid water pipe (9) splined shaft (8) is reached far from the rear end outside the end of the head (3) end, and the machine is fixed on by water pipe bracket On frame (7) or the speed reducer (2).

9. a kind of machine for cutting thread for steel bar according to claim 8, which is characterized in that automatic control system (11) packet Include driving pulley (23), synchronous belt (24), driven pulley (25), encoder (26) and control unit, the driving pulley (23) On the splined shaft (8), the driven pulley (25) is connected by the synchronous belt (24) and the driving pulley (23) It connects, the encoder (26) connect with the driven pulley (25), and is electrically connected with described control unit.

10. a kind of machine for cutting thread for steel bar according to claim 9, which is characterized in that the hydraulic cylinder is set by one There is the hydraulic pump of solenoid valve or electro-hydraulic valve to drive and control；The hydraulic pump is electrically connected with the automatic control system (11) It connects.