CN208408772U - A kind of machine for cutting thread for steel bar - Google Patents

Abstract

The utility model discloses a kind of machine for cutting thread for steel bar, comprising: main motor, speed reducer, spindle box, head, feed mechanism, guide rod, vice, cutter mechanism, rack and automatic control system；Vice, guide rod and speed reducer are both secured in rack, and speed reducer is provided parallel to axis speed reducer, and speed reducer output shaft is set as splined shaft；Main shaft passes through first shaft coupling and spline axis connection；Main motor is connect with speed reducer；Feed mechanism is arranged in parallel in the lower section of splined shaft, for pushing head to move axially；Automatic control system is electrically connected with feed mechanism and speed reducer.The utility model, which discloses, provides a kind of machine for cutting thread for steel bar, has better machining accuracy, higher production efficiency and lower maintenance cost, is particularly suitable for high-volume screw thread steel machining production line, has a vast market foreground.

Description

A kind of machine for cutting thread for steel bar

Technical field

The utility model relates to construction equipment technical fields, process more particularly to a kind of screw thread steel Machine.

Background technique

In modern concrete structural construction, reinforced bar sleeve threaded connection is one of most important connecting method for reinforcing bars.It should Method is to process straight thread or taper thread for end reinforced, then with being machined with the connection sleeve of corresponding internal screw thread for two reinforcing bars It links together, connection is quickly, performance is good, is widely used.The processing of steel bar joint screw is usually live or pre- in engineering construction The steel bar meter field of component factory processed carries out, and is completed by using special reinforced thread generator.

Machine for cutting thread for steel bar includes by main motor, speed reducer, head, base, feed mechanism, guide rod or sliding rail, cooling System, reinforcing bar clamp vice, rack.Domestic machine for cutting thread for steel bar has nearly 30 years applicating histories, but produces currently on the market There are still some shortcomings for product:

Firstly, base is integrated or is combined into one with speed reducer base, main motor is directly connected to or is mounted in speed reducer It is indirectly connected on base with speed reducer, head spindle is installed on the output shaft of speed reducer, head is installed on main shaft, base is mounted in and leads On bar or sliding rail, when screwing steel bars screw thread, base is pushed to drive the edge together such as head, speed reducer, main motor by feed mechanism Guide rod or sliding rail longitudinal movement, head movement speed depend on feed mechanism provide driving force size, no matter manual drive into Drive feed mechanism to mechanism or hydropneumatic power assisting device, Feed servo system power all with the thread pitch onrelevant processed, Only in threading tool or cylindrical die roll after steel bar meter goes out one section of screw thread, molded screw thread and cutter or cylindrical die roll are mutual Effect, moves on head by the screw pitch of machined forming thread.Therefore, the spiral shell of the processing of this machine for cutting thread for steel bar Line is influenced very big by feed mechanism driving force, it is difficult to be produced the screw thread for really meeting design accuracy requirement, be used people completely The equipment of work driving is even more labor intensity height, and accuracy of thread is poor；And head rotation is formed into subtracting for mechanical linkage structure with screw rod Fast machine avoids head feeding and manually or mechanically helps although the distance that head rotation is advanced is associated with the formation of linkage screw screw pitch Dynamic influence of the driving force to accuracy of screw machining, but process different pitch screws and need the screw rod using corresponding screw pitch, therefore add When the screw pitch of work reinforcing bar changes, it is necessary to replace linkage screw, production efficiency is low, and screw rod abrasion is to screw thread steel machining accuracy Also there is direct influence.

Secondly, machine for cutting thread for steel bar using input shaft, output shaft same axis structure speed reducer, cooling system Coolant liquid is to enter spindle hole by the head spindle radial hole installed on speed reducer output shaft, enters back into head center Hole is lubricated threading tool and screw thread steel silk head, cools down, in the coolant liquid access aperture two sides of head spindle At ring type seal and main shaft cooperation, the tiny iron filings of circulating cooling liquid bring can be accumulated, iron filings are caused to main shaft and sealing element Coolant liquid will be made to leak after abrasion, damage adjacent components, cause the higher frequency of maintenance of equipment, reduce the effective time It is short, increase the processing cost of screw thread steel.

Defect in these machine for cutting thread for steel bar structures in design, seriously constrains screw thread steel machining accuracy and production The raising of efficiency, the 2017 Nian9Yue Central Committee of the Communist Party of China, State Council have issued " instruction about development increased quality action ", This policy requirements guidance under, we should make great efforts improve China construction engineering quality, and improve construction equipment technology, Quality level is then the basic work for completing this task.

Therefore, how the machine for cutting thread for steel bar of a kind of good processing accuracy, high production efficiency is provided, is those skilled in the art The problem of member's urgent need to resolve.

Utility model content

In view of this, the present invention provides a kind of machine for cutting thread for steel bar, not only guarantee the processing essence of screw thread steel Degree is high, improves work efficiency, and extend the service life of processing machine, reduces production cost.

To achieve the goals above, the utility model adopts the following technical solution:

A kind of machine for cutting thread for steel bar, comprising: main motor, speed reducer, head, the base of tool, main shaft, first shaft coupling, flower Key axis, spindle box, guide rod, feed mechanism, vice, rack and automatic control system；It the vice, the speed reducer and described leads Bar is both secured in the rack；The main motor is connected with the speed reducer；The speed reducer is provided parallel to axis deceleration Machine, and the output shaft of the speed reducer is set as splined shaft；The splined shaft can be sliding along the output shaft axis of the speed reducer It is dynamic；The base of tool and cutter of screwing steel bars are installed, the head is mounted on the master supported by the spindle box on the head On axis, the main shaft passes through first shaft coupling and the spline axis connection；The feed mechanism is arranged in parallel in the splined shaft Lower section, for pushing the spindle box to move axially, and then drive the head to move along axis by spindle box；It is described automatic Control system is electrically connected with the speed reducer and the feed mechanism.

Preferably, the spindle box is supported in the rack by a pair of guide rods, and can be sliding along the guide rod axis It is dynamic；The axis of the guide rod is parallel to the axis of the splined shaft；The treasure maesa herb of through-hole is equipped with centered on the splined shaft setting Key axis.

It preferably, further include coolant circulation system, the coolant circulation system includes coolant liquid water pipe, the cooling Liquid water pipe is set in the central through hole of the splined shaft, and the center of the head is arranged in the front end of the coolant liquid water pipe In hole, the rear end of the coolant liquid water pipe is stretched out other than end of the splined shaft far from head end.

Preferably, the feed mechanism includes: servo motor, speed reducer for servo motor, lead screw, second shaft coupling and lead screw One end of swivel nut, the lead screw is mounted in fixed bearing block, and the other end is installed in supporting bearing base；The fixed bearing block and The supporting bearing base is both secured in the rack；The servo motor is connected with the speed reducer for servo motor, described to watch The output shaft for taking motor reducer is connect by the second shaft coupling with the lead screw in the fixed bearing block；The silk Thick stick swivel nut and the lead screw are cooperatively connected, and are fixedly connected with the spindle box.Servo motor subtracts by speed reducer for servo motor Accurately lead screw is driven to rotate clockwise or counterclockwise after speed, the rotation of lead screw has pushed lead screw swivel nut and spindle box band motivation Head is moved along the axis of the splined shaft, to realize the forward or backward of head, is completed the accurate traveling of head, is realized reinforcing bar The processing of screw thread.

Preferably, the forward end for the coolant liquid water pipe being placed in the head centre bore is provided with reinforcing bar locating rod, and The reinforcing bar locating rod is corresponding with screw thread steel length to be processed.Realize that the end for being processed reinforcing bar is fixed by reinforcing bar locating rod Position guarantees the machining accuracy of screw thread steel length.

It preferably, further include a cutter mechanism, described cutter mechanism includes hydraulic cylinder and knife ring, and described knife ring setting exists For controlling the folding of the base of tool on the outside of the head, the movement of described knife ring is controlled by the hydraulic cylinder.

Preferably, the vice is set as being clamped by the Driven by Hydraulic Cylinder by the fixture that a pair moves in parallel in opposite directions The automatic clamping mechanism of reinforcing bar.

Preferably, the coolant liquid water pipe reaches the splined shaft far from the rear end outside the end of the head end, passes through Water pipe bracket is fixed on the rack or the speed reducer.

Preferably, the automatic control system includes driving pulley, synchronous belt, driven pulley, encoder and control unit, The driving pulley is mounted on the splined shaft, and the driven pulley is connect by the synchronous belt with the driving pulley, The encoder is connect with the driven pulley, and is electrically connected with the control unit.Driving pulley drives driven pulley rotation, Encoder detects the rotational parameters of driven pulley and is transferred to control unit, and control unit controls servo electricity according to testing result The movement speed of machine.Screw thread for processing different screw pitch need to only design the driver ginseng to servo motor on the control unit Number, simple and convenient, not only the labor intensity of operator reduces significantly, but also generally reduce device fabrication and maintenance at This, substantially increases the equipment effective time, improves production efficiency, significantly reduce the processing cost of screw thread steel.

Preferably, the hydraulic cylinder is equipped with the hydraulic pump driving and control of solenoid valve or electro-hydraulic valve by one；Institute Hydraulic pump is stated to be electrically connected with the automatic control system.

It can be seen via above technical scheme that compared with prior art, a kind of screw thread steel disclosed by the utility model adds Work machine, using parallel axle speed reducing machine, and by the fixed rack of speed reducer and main motor, using in the output end of speed reducer can axis To mobile splined shaft, rotational power, while the feed mechanism driven by servo motor are provided to head by splined shaft, is driven Dynamic main shaft, head, spindle box, splined shaft are vertically moved along guide rod, it has the advantage that:

First, the load that feed mechanism driving moving parts advances is greatly reduced, power mechanism, feed mechanism are improved Durability and service life, reduce the processing cost of screw thread；

Second, with automatic control system control servo motor driving feed mechanism realize the movement to head longitudinal direction and What head rotation matched is precisely controlled, and promotes the accuracy of screw machining of machine for cutting thread for steel bar to the industrial lathe of high-precision Precision level；

Third, coolant circulation system are sent into coolant liquid from the hollow splined output shaft of speed reducer to head centre bore, are made cold But liquid is thoroughly isolated with mechanical parts such as head spindles, not only avoids the damage of machine components, and the work of direct sending coolant liquid It is good to make high pressure, cooling process tool, flushing cutting iron filings effect, improves screw processing quality, reduces cutter loss, section Screw thread process cost is saved；

4th, with the cutter mechanism of automatic control system control driving, knife, the time of returning sword is more accurate, movement is more reliable, It is few to open cutter mechanism accessory loss, further improves accuracy of screw machining；

5th, with the vice of automatic control system control driving, steel bar clamping work is realized into automation, is grasped reducing The labor intensity for making worker simultaneously, is raised labour productivity, and screw thread process cost is reduced；

6th, reinforcing bar is processed in vice clamping sinciput and positions boom end on being fixed on coolant liquid water pipe, may be implemented Screwing steel bars longitudinal direction exact position, positioning method is simple, precision is high, equally has to the raising of accuracy of screw machining and production efficiency It is contributed.

As it can be seen that the utility model discloses the machine for cutting thread for steel bar of offer, there is better machining accuracy, higher production Efficiency and lower maintenance cost are particularly suitable for high-volume screw thread steel machining production line, before having a vast market Scape.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also Other attached drawings can be obtained according to the attached drawing of offer.

Fig. 1 attached drawing is main view provided by the utility model.

Fig. 2 attached drawing is B-B sectional view provided by the utility model.

Fig. 3 attached drawing is top view provided by the utility model.

Fig. 4 attached drawing is the sectional view of feed mechanism provided by the utility model.

Fig. 5 attached drawing is side view provided by the utility model.

Wherein, 1 is main motor, and 2 be speed reducer, and 3 be head, and 4 be feed mechanism, and 5 be vice, and 6 be a cutter mechanism, and 7 are Rack, 8 be hollow splined shaft, and 9 be coolant liquid water pipe, and 10 be first shaft coupling, and 11 be automatic control system, and 12 be main shaft, 13 It is the base of tool for guide rod, 14,15 be spindle box, and 16 be a knife ring, and 17 be servo motor, and 18 be speed reducer for servo motor, and 19 are Lead screw, 20 be fixed bearing block, and 21 be supporting bearing base, and 22 be reinforcing bar locating rod, and 23 be driving pulley, and 24 be synchronous belt, 25 It is encoder for driven pulley, 26,27 be lead screw swivel nut, and 28 be second shaft coupling.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The utility model embodiment discloses a kind of machine for cutting thread for steel bar, including 1, 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 5,7 and of rack Automatic control system 11；Vice 5, speed reducer 2 and guide rod 13 are both secured in rack 7；Main motor 1 is connect with speed reducer 2；Slow down Machine 2 is provided parallel to axis speed reducer, and the output shaft of speed reducer 2 is set as splined shaft 8；Splined shaft 8 can be along the defeated of speed reducer 2 The sliding of shaft axis；The base of tool 14 and cutter of screwing steel bars are installed, head 3 is mounted on to be supported by spindle box 15 on head 3 Main shaft 12 on；Main shaft 12 connect by first shaft coupling 10 with splined shaft 8, and by the transmitting of splined shaft 8 come power realization The rotation of head 3；The guide rod 13 that a pair of of axis is parallel to 8 axis of splined shaft is fixed in rack 7；Spindle box 15 is by guide rod 13 Support, and can be slided along 13 axis of guide rod；Feed mechanism 4 is arranged in parallel in the lower section of splined shaft 8, for pushing 15 axis of spindle box Head 3 is driven to move along axis to movement, and then by spindle box 15；Automatic control system 11 and speed reducer 2 and feed mechanism 4 are equal Electrical connection.

Speed reducer 2 is fixed in rack 7, and splined shaft 8 is equipped with the hollow splined shaft of through-hole, splined shaft 8 centered on being arranged Both ends are stretched out before and after output end of reducer respectively, and speed reducer 2 is given by hollow splined shaft 8, first shaft coupling 10 and main shaft 12 Head 3 provides rotatory force, only has moving component: head 3, main shaft 12, spindle box 15, first shaft coupling 10 and hollow splined shaft 8, the total weight of moving mechanical part is light, greatly reduces the load that feed mechanism 4 drives head 3 to advance, makes feed mechanism Motional inertia reduces, and lifetime of system improves, and thereby reduces the processing cost of screw thread steel.

It further include coolant circulation system to further optimize above-mentioned technical proposal, coolant circulation system includes: Coolant liquid water pipe 9, coolant liquid water pipe 9 are set in the central through hole of splined shaft 8, and the front end of coolant liquid water pipe 9 is arranged in machine In first 3 centre bore, the rear end of coolant liquid water pipe 9 is stretched out other than end of the splined shaft 8 far from 3 end of head.By subtracting It is inserted into coolant liquid water pipe 9 in 8 centre bore of splined shaft of fast machine 2, cooling water can not only be made all to be flushed on cutting element, it is cooling Effect is good, and the metal fillings for avoiding screwing steel bars screw thread from cutting is flushed to inside head, falls in bite and with the rotation of head 3 Between processed screw thread steel, to guarantee the Forming Quality of screw thread, the machining accuracy of screw thread is improved.

In order to further optimize above-mentioned technical proposal, feed mechanism 4 includes: servo motor 17, speed reducer for servo motor 18, lead screw 19, second shaft coupling 28 and lead screw swivel nut 27, one end of lead screw 19 are mounted in fixed bearing block 20, other end peace It fills in supporting bearing base 21, fixed bearing block 20 and supporting bearing base 21 are both secured in rack 7；Feed mechanism 4 is relative to machine Frame 7 be it is static, lead screw 19 rotate, pushed the axial movement of spindle box 15；Servo motor 17 and speed reducer for servo motor 18 Connection, the output shaft of speed reducer for servo motor 18 are connect by second shaft coupling 28 with lead screw 19 in fixed bearing block 20；Silk Thick stick swivel nut 27 and lead screw 19 are cooperatively connected, and are fixedly connected with spindle box 15, and as the rotation of lead screw 19 pushes spindle box 15 drive heads 3 are moved along the axis of splined shaft 8.Servo motor 17 drives lead screw 19 after the deceleration of speed reducer for servo motor 18 It accurately rotates clockwise or counterclockwise, the rotation of lead screw has pushed lead screw swivel nut 27 and spindle box 19 to drive head 3 along spline The axis of axis 8 is mobile, to realize the forward or backward of head 3, completes the accurate traveling of head 3, realizes adding for screw thread steel Work.

In order to further optimize above-mentioned technical proposal, it is placed in the forward end setting of the coolant liquid water pipe 9 of 3 inner hole of head There is reinforcing bar locating rod 22, and reinforcing bar locating rod 22 is corresponding with screw thread steel length to be processed.It is realized by reinforcing bar locating rod 22 The positioning of reinforcing bar guarantees the machining accuracy of screw thread steel.

It further include a cutter mechanism 6 to further optimize above-mentioned technical proposal, cutter mechanism 6 includes hydraulic cylinder and opens Knife ring 16, knife ring 16 are arranged in for controlling the folding of the base of tool 14 on the outside of head 3, and the movement of knife ring 16 passes through hydraulic cylinder Control.

In order to further optimize above-mentioned technical proposal, vice 5 is set as by Driven by Hydraulic Cylinder, by a pair of opposite parallel The automatic clamping mechanism of mobile fixture clamping reinforcing bar.

In order to further optimize above-mentioned technical proposal, coolant liquid water pipe 9 reaches splined shaft 8 far from 3 end end of head Outer rear end is fixed in rack 7 or speed reducer 2 by water pipe bracket.Coolant liquid water pipe 9 is inserted into 8 centre bore of splined shaft, is kept away Having exempted from sealing system damage brings systematic part to damage, to reduce plant maintenance use cost；Automatic clamping mechanism makes steel The production and processing of muscle can be fully automated, and significantly improve processing efficiency, reduce screw thread process cost.

In order to further optimize above-mentioned technical proposal, automatic control system 11 include driving pulley 23, synchronous belt 24, from Movable belt pulley 25, encoder 26 and control unit, driving pulley 23 are mounted on splined shaft 8, and driven pulley 25 passes through synchronous belt 24 It is connect with driving pulley 23, encoder 26 is connect with driven pulley 25, and is electrically connected with control unit.Control unit is set as PLC, driving pulley drive driven pulley rotation, and encoder detects the rotational parameters of driven pulley and is transferred to PLC, PLC root According to the movement speed of testing result control servo motor.Screw thread for processing different screw pitch need to only design on PLC to servo The driver parameter of motor, simple and convenient, not only the labor intensity of operator reduces significantly, but also generally reduces and set It prepares and makes and maintenance cost, substantially increase the equipment effective time, improve production efficiency, significantly reduce screw thread steel Processing cost.

In order to further optimize above-mentioned technical proposal, hydraulic cylinder is equipped with the liquid of solenoid valve or electro-hydraulic valve by one Press pump driving and control；Hydraulic pump is electrically connected with automatic control system 11.

The course of work of a kind of machine for cutting thread for steel bar disclosed by the utility model are as follows: firstly, connection circuitry, hydraulic Oil piping system, starting device automatic control system 11 are inserted into reinforcing bar in vice jaw, withstand on reinforcing bar locating rod for end reinforced On 22, steel bar clamping control button is pressed, starting automatic clamping mechanism clamps reinforcing bar, then presses steel bar meter button, starting master Motor 1, main motor 1 drive parallel axle speed reducing machine 2 to rotate, and the power that speed reducer 2 exports passes through the splined shaft 8, first of output end Shaft coupling 10, main shaft 12 send head 3 to, and head 3 is rotated with reinforcing bar process tool seat and cutter；The spindle box of supports main shaft 12 15 are supported in rack 7 by a pair of guide rods 13, and 8 parallel beneath of splined shaft is provided with the lead screw 19 driven by servo motor 17, While head 3 rotates, the splined shaft 8 of synchronous rotation drives driving pulley 23 to rotate, and driving pulley 23 passes through synchronous belt 23 Driven pulley 25 is driven to rotate, encoder 26 records the rotational parameters data of driven pulley 25 and passes to automatic control system 11, it is rotated by the PLC control servo motor 17 of automatic control system 11, servo motor 17 slows down by speed reducer for servo motor 18 Driving lead screw 19 accurately rotates clockwise or counterclockwise afterwards, and the rotation of lead screw has pushed lead screw swivel nut 27 and spindle box 15 to drive Head 3 is moved along the axis of splined shaft 8, thus realize that the setting value according to automatic control system 11 of head 3 moves forward or back, The accurate traveling in the rotation of head 3 on axis is completed, realizes the accurate processing of screw thread steel；The steel of complete specific length to be processed After muscle screw thread, signal enabling cutter mechanism 6 is issued by PLC setting program, pushes a knife ring 16 mobile by cutter mechanism 6, makes steel Muscle process tool seat and cutter realize a knife movement, and then PLC controls 17 motor reversal of servo motor, and head 3 is returned to and is set Positioning is set, while a cutter mechanism 6 retracts original position, unclamps the automatic clamping mechanism of rebar clips, and automatic control system issues signal, Speed reducer 2 stops operating, and the rotation of head 3 stops, and removes the reinforcing bar for processing screw thread, and the screw thread process of a reinforcing bar is completed.

Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part It is bright.

The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The widest scope consistent with features of novelty.

Claims (10)

1. a kind of machine for cutting thread for steel bar characterized by comprising 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 on 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 move 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 on 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 it 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: to watch Take motor (17), speed reducer for servo motor (18), lead screw (19), second shaft coupling (28) and lead screw swivel nut (27), the lead 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 on the rack (7) with the supporting bearing base (21)；The servo motor (17) and the servo motor Speed reducer (18) connection, the output shaft of the speed reducer for servo motor (18) pass through described the in the fixed bearing block (20) Two shaft couplings (28) are connect with the lead screw (19)；The lead screw swivel nut (27) and the lead screw (19) are cooperatively connected, and with institute It states spindle box (15) to be fixedly connected, and as the rotation of the lead screw (19) pushes the spindle box (15) to drive head (3) Axis along the splined shaft (8) is mobile.

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 the interior coolant liquid water pipe (9) is provided with reinforcing bar locating rod (22), and the reinforcing bar locating rod (22) with to Screwing steel bars reach is corresponding.

6. a kind of machine for cutting thread for steel bar according to claim 1, which is characterized in that it further include a cutter mechanism (6), it is described Opening cutter mechanism (6) includes hydraulic cylinder and knife ring (16), 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 movement 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 6, 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. a kind of machine for cutting thread for steel bar according to claim 3, which is characterized in that the coolant liquid water pipe (9) is stretched out To the splined shaft (8) far from the head (3) end end outside rear end, by water pipe bracket be fixed on the rack (7) or On 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) It is mounted 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 the control unit.

10. a kind of machine for cutting thread for steel bar according to claim 6, 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.