CN102909440A - Synchronous tapping machine with retractable inner shaft of motor - Google Patents

Abstract

The invention relates to a tapping machine which utilizes a cylinder to realize rapid advance and retreat in idle strokes, utilizes the forward and reverse rotation of a motor, and drives the nut to rotate through the speed change of a belt and a gear, and realizes synchronous thread processing by feeding and retreating a screw rod. It includes a frame, a squirrel-cage motor, a gearbox, a screw nut transmission mechanism, a fast cylinder idle travel mechanism and a parking brake mechanism; The motor is fixed on the frame, the gearbox is installed on the back cover of the squirrel-cage motor, the screw nut transmission mechanism and the parking brake mechanism are fixedly installed in the gearbox, and the cylinder idle stroke fast mechanism is installed on the screw nut transmission mechanism. At the upper end of the screw, the squirrel-cage motor drives the expansion and rotation of the inner shaft of the squirrel-cage motor through the gearbox and the screw nut transmission mechanism, and controls the movement of the squirrel-cage motor through the cylinder idle stroke fast mechanism and the parking brake mechanism Free-travel forward and parking brakes for inner axles.

Description

Synchronous Tapping Machine with Telescopic Motor Inner Shaft

technical field

The invention relates to a tapping machine in mechanical processing equipment, in particular to a tapping machine that utilizes a cylinder to realize rapid advance and retreat in idle strokes, utilizes the forward and reverse rotation of the motor and drives the nut to rotate through the speed change of the belt and the gear, and the screw rod feeds and retreats to realize Tapping machine for simultaneous threading.

Background technique

Existing synchronous tapping machine generally is made up of three-phase asynchronous motor, belt, main shaft, lifting cover, electromagnetic clutch, screw mandrel and gear, and motor is connected with main shaft and screw mandrel by gear and belt. The feed speed required for rapid advance and retreat and synchronous tapping uses electromagnetic clutches to switch gears with different sizes of teeth to complete the meshing. Use the switch to commutate the power supply to realize the positive and negative rotation of the motor to drive the main shaft and the screw to control the main shaft. Forward and reverse to achieve simultaneous tapping.

The disadvantage of this structure is that the motor is used to control the main shaft, and the electromagnetic clutch is used to switch gears to complete the fast forward and retreat of the idle stroke and the advance and retreat of the working stroke according to the pitch. The structure is relatively complicated, the manufacturing precision is high, and the cost is also high.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects, and provide a tapping machine that utilizes the cylinder to realize rapid advance and retreat in idle strokes, utilizes the forward and reverse rotation of the motor, and drives the screw to advance and retreat through the speed change of the belt and gear to realize synchronous thread processing.

The solution adopted in the present invention is: a synchronous tapping machine with telescopic inner shaft of the motor, characterized in that it includes a frame (9), a squirrel-cage motor (1), a gearbox (19), a screw nut drive Mechanism, cylinder idle stroke fast mechanism and parking brake mechanism; the inner shaft of the squirrel-cage motor (1) can be freely retracted, and a cutter is installed at the lower end, and the squirrel-cage motor (1) is fixed on the frame (9) , the gearbox (19) is installed on the rear cover of the squirrel-cage motor (1), the screw nut transmission mechanism and the parking brake mechanism are fixedly installed in the gearbox (19), and the cylinder idle stroke fast mechanism is installed on the screw nut drive The upper end of the screw rod of the mechanism, the squirrel-cage motor (1) drives the expansion and rotation of the inner shaft of the squirrel-cage motor (1) through the gearbox (19) in cooperation with the screw nut transmission mechanism, and quickly Mechanism and Parking Brake The mechanism controls the idle travel forward and parking brake of the inner shaft of the squirrel cage motor (1).

The central hole of the rotor core (2) of the squirrel-cage motor (1) is reamed, and the inner diameter of the rotor core (2) after reaming is not greater than the inner diameter of the fence cage in the rotor core (2); the motor shaft is composed of The split-type shaft sleeve body (3) with internal splines in the middle section is fitted with the corresponding inner shaft (4) with external splines in the middle section. The front and rear sections of the inner hole of the shaft sleeve body (3) are cylindrical holes. The middle section is an internal spline, the outer diameter of the front section is an external thread, the outer circle of the sleeve body (3) is tightly fitted and fixed in the central hole of the rotor core (2), the front section and the rear section of the inner shaft (4) are optical axes, and the middle section is External spline, the lower end of the optical shaft is provided with an internal taper hole and external thread for installing the collet, and a stepped shaft (5) front threaded column is screwed and fixed in the central threaded hole provided on the rear end of the inner shaft (4) , the stepped shaft (5) simultaneously presses the return spring (6) into the space formed by the rear section of the inner hole of the sleeve body (3), that is, the inner hole behind the inner spline and the rear optical axis of the inner shaft (4) , put a steel ball (7) in the central hole on the upper end surface of the stepped shaft (5); the waterproof cover (8) is screwed and fixed on the external thread of the outer diameter of the front section of the shaft sleeve body (3), and the squirrel cage motor (1 ) end caps with a certain clearance fit.

The speed gearbox includes a synchronous pulley (10), a lower synchronous pulley and gear fixing device, an upper synchronous pulley and gear fixing device, the first synchronous belt (11), The second synchronous belt (12), the synchronous pulley (30) and the gearbox casing (20), the gearbox casing (20) are integrally fixed on the rear cover of the squirrel-cage motor (1) by screws.

The inner hole of the synchronous pulley (10) is statically fitted with the outer diameter of the rear section of the shaft sleeve body (3); the keyway in the inner hole also corresponds to the keyway on the outer diameter of the rear section of the shaft sleeve body (3), and Connect together with the shaft sleeve body (3) by a key.

The lower synchronous pulley and gear fixing device: including lower synchronous pulley (12), bearing (15), lower bearing fixing seat (13), bearing pressure plate (14), gear fixing plate (16), gear (18) and positioning nails (17); there is a concentric step hole in the lower synchronous pulley (12), the middle section is equipped with a bearing (15), and there is a lower bearing fixing seat (13) in the shape of a stepped shaft, and the big end is fixed on the gearbox by screws On the shell (20), the small end is in static fit with the inner hole of the bearing (15). The large end of the disc-shaped bearing plate (14) is pressed against the inner ring of the bearing (15), the small end is in clearance fit with the inner step hole of the lower bearing holder (13), and a screw passes through the inner ring of the bearing plate (14). Inner hole, fix the bearing pressure plate (14) and the bearing (15) on the central threaded hole of the lower bearing fixing seat (13); the stepped disk-shaped gear fixing plate (16) with internal thread is concentrically fixed on the lower timing belt by screws In the center of the wheel (12), there is a gear (18) with a concentric step well hole inside. The inner diameter of the step well is statically matched with the outer step of the gear fixing plate (16), and is concentrically fixed on the gear fixing plate (16) by screws and positioning nails (17). ) of the center.

The upper synchronous pulley and gear fixing device: including upper synchronous pulley (24), bearing (25), upper bearing fixing seat (26), bearing pressure plate (23), gear fixing plate (22), gear (21) , positioning nail (17), pressure plate (27) and fixing nut (28); the structure of the bearing end of the upper bearing fixing seat (26) and the installation method of other connected parts are similar to the lower bearing fixing seat (13); One end is cylindrical, with an external thread on the head, which passes through the upper hole of the gearbox casing (20) and the center hole of the pressure plate (27), and is screwed and fixed on the gearbox casing (20) through a fixing nut (28).

The screw nut transmission mechanism: includes a screw rod (35) with an inner hole fixed on the cylinder bottom plate (37), fixed on the synchronous pulley (30) by screws, and has a concentric stepped shaft with a small end The main nut (31) with external thread, the bearing (32), the compression nut (34) and the bearing cover plate (33); the inner diameter of the bearing (32) and the outer diameter of the stepped shaft middle of the main nut (31) form a static fit . The compression nut (34) is screwed on the thread of the main nut (31) to press the inner ring of the bearing (32); the outer diameter of the bearing (32) and the stepped hole of the gearbox housing (20) form a static fit; the stepped hole The disc-shaped bearing cover plate (33) presses the outer ring of the bearing (32), and is fixed on the gearbox housing (20), and the screw mandrel (35) is screwed and passed through the main nut (31).

The cylinder idle stroke fast mechanism: includes the cylinder (38), the cylinder bottom plate (37), the push rod (36), the limit nut (42), the cylinder (38) is fixed on the cylinder bottom plate (37), and the lower end of the cylinder rod It is screwed and fixed with the push rod (36) with external thread on the cylindrical head, the outer diameter of the push rod (36) and the inner hole of the screw rod (35) form a clearance fit, and the two limit nuts (42) are tightly fixed on the cylinder (38) on the cylinder rod at the upper end.

The parking brake mechanism: includes a disc-shaped moving wheel set on the upper end step of the bushing body (3) and fixed with the synchronous pulley (10) and pressed on the bushing body (3) by a nut (41). Friction disc (40), friction disc (39), pull rod (46), pre-compression spring (51), upper plate (43), screw (44) and nut (45); one end of the cylindrical pull rod (46) It is fixed on the friction disc (39), passes through the upper end of the transmission case (20) and the bottom plate of the cylinder (37), and the contact position forms a clearance fit, and the other end is fixed with the upper plate (43) by screws; the upper plate (43) corresponds to the cylinder There is a threaded hole in the rod position, screw and fix the height-adjustable screw (44) and nut (45), and the pre-compression spring (51) set on the lower end of the pull rod (46) is compressed and mounted on the gearbox casing (20 Between the inner upper end surface and the friction disc (39).

The beneficial effects of the present invention are: directly use the inner shaft of the motor as the lifting shaft, save the transmission shaft and the lifting sleeve of the traditional tapping machine, and simplify the structure; The speed change of the gear and the gear drives the screw to feed and retreat to realize the synchronous thread processing of the tapping machine.

Description of drawings

Fig. 1 is a top view of the structure of the present invention.

Fig. 2 is a schematic group diagram of A-A section and B-B section and simplified structure of Fig. 1 .

Fig. 3 is a schematic diagram of a cut-away section along line C-C of Fig. 1 and a simplified partial structure.

FIG. 4 is a D-D sectional view of FIG. 2 .

FIG. 5 is a sectional view along line E-E of FIG. 1 .

Figure 6 is an example of the shape.

Figure 7 is an example of the partially hidden shape of the gearbox casing.

In the figure: 1. Squirrel cage motor 2. Rotor core 3. Shaft sleeve body 4. Inner shaft 5. Step shaft 6. Return spring 7. Steel ball 8. Waterproof cover 9. Frame 10. Synchronous pulley 11. Synchronous belt 12. Lower synchronous pulley 13. Lower bearing holder 14. Bearing pressure plate 15. Bearing 16. Gear fixing plate 17. Locating pin 18. Gear 19. Gearbox 20. Gearbox housing 21. Gear 22. Gear Fixed plate 23, bearing pressure plate 24, synchronous pulley 25, bearing 26, upper bearing holder 27, pressure plate 28, fixed nut 29, synchronous belt 30, synchronous pulley 31, main nut 32, bearing 33, bearing cover plate 34, Compression nut 35, screw rod 36, push rod 37, cylinder bottom plate 38, cylinder 39, friction plate 40, moving friction plate 41, nut 42, limit nut 43, upper plate 44, screw 45, nut 46, pull rod 47, Limit screw 48, travel switch 49, parking screw 50, travel switch 51, pre-compression spring.

Detailed ways

The present invention is further described below by specific embodiment:

The structure of the present invention comprises frame 9, squirrel-cage motor 1, gearbox 19, screw nut transmission mechanism, cylinder idle stroke fast mechanism and parking brake mechanism, squirrel-cage motor 1 is fixed on the frame 9, and gearbox 19 is installed On the rear cover of the squirrel-cage motor 1, the screw nut transmission mechanism and the parking brake mechanism are fixedly installed on the gearbox 19, and the cylinder idle stroke fast mechanism is installed on the screw mandrel.

The central hole of the rotor iron core 2 of the squirrel-cage motor 1 is reamed, and the inner diameter of the rotor iron core 2 after reaming is not greater than the inner diameter of the fence cage in the rotor iron core 2; The shaft sleeve body 3 is fitted with the corresponding inner shaft 4 with external splines in the middle section. The front and rear sections of the inner hole of the shaft sleeve body 3 are cylindrical holes, the middle section is an internal spline, and the outer diameter of the front section is an external thread. The outer circle of the shaft sleeve body 3 is tightly fitted and fixed in the central hole of the rotor core 2. The front and rear sections of the inner shaft 4 are optical axes, the middle section is an external spline, and the lower end of the optical axis is provided with an inner taper hole for installing a chuck and The external thread is screwed and fixed in the central threaded hole provided on the rear end surface of the inner shaft 4 by using a threaded column at the front end of the stepped shaft 5, and the stepped shaft 5 simultaneously presses the return spring 6 on the back section of the inner hole of the shaft sleeve body 3, that is, the inner flower In the space formed by the inner hole behind the key and the rear optical axis of the inner shaft 4, a steel ball 7 is sleeved in the central hole on the upper end surface of the step shaft 5 . The waterproof cover 8 is screwed and fixed on the external thread of the outer diameter of the front section of the shaft sleeve body 3, and has a certain clearance fit with the end cover of the squirrel-cage motor 1.

The speed gearbox 19: including the synchronous pulley 10 installed on the rear section of the shaft sleeve body 3, the lower synchronous pulley and gear fixing device, the upper synchronous pulley and gear fixing device, the first synchronous belt 11, the second synchronous belt 12. The synchronous pulley 30 and the gearbox casing 20, the gearbox casing 20 is integrally fixed on the rear cover of the squirrel-cage motor 1 by screws.

The inner hole of the synchronous pulley 10 is in static fit with the outer diameter of the rear section of the shaft sleeve body 3 . The keyway in the inner hole is also corresponding to the keyway on the outer diameter of the rear section of the shaft sleeve body 3, and is connected with the shaft sleeve body 3 by a key.

Described lower synchronous pulley and gear fixing device: comprise lower synchronous pulley 12, bearing 15, lower bearing holder 13, bearing pressure plate 14, gear fixed plate 16, gear 18 and positioning nail 17. There are concentric step holes in the lower synchronous pulley 12, the middle section is matched with bearing 15, and there is a lower bearing holder 13 in the shape of a stepped shaft. . The large end of the disc-shaped bearing plate 14 is pressed on the inner ring of the bearing 15, and the small end is in clearance fit with the inner stepped hole of the lower bearing holder 13. A screw passes through the inner hole of the bearing plate 14, and the bearing plate 14 is connected. Bearing 15 is fixed on the central screw hole of lower bearing holder 13. The stepped disk-shaped gear fixing plate 16 with internal thread is concentrically fixed on the center of the lower synchronous pulley 12 by screws, and there is a gear 18 with a concentric step well hole inside. It is fixed on the center of the gear fixing plate 16 concentrically with the positioning nail 17.

Described upper synchronous pulley and gear fixture: comprise upper synchronous pulley 24, bearing 25, upper bearing holder 26, bearing pressing plate 23, gear fixing plate 22, gear 21, positioning nail 17, pressing plate 27 and retaining nut 28. The structure of upper bearing holder 26 installation bearing one end and the installation mode of other parts connected are identical with lower bearing holder 13. The other end is cylindrical and has an external thread on the head. It passes through the upper hole of the gearbox casing 20 and the center hole of the pressure plate 27, and is screwed and fixed on the gearbox casing 20 through the fixing nut 28.

The screw nut transmission mechanism: includes a screw rod 35 with an inner hole fixed on the cylinder bottom plate 37, fixed on the synchronous pulley 30 by screws, and has a main nut with a concentric stepped shaft and a small end with an external thread 31, bearing 32, compression nut 34 and bearing cover plate 33. The inner diameter of the bearing 32 and the outer diameter of the stepped shaft middle part of the main nut 31 form static fit. The compression nut 34 is screwed into the thread of the main nut 31 to press the inner ring of the bearing 32 . The outer diameter of the bearing 32 and the stepped hole of the gearbox housing 20 form a static fit. The disc-shaped bearing cover plate 33 with stepped holes presses the outer ring of the bearing 32 and is fixed on the gearbox housing 20 . The screw rod 35 is screwed and passed through the main nut 31 .

Described air cylinder idle stroke fast mechanism: comprises air cylinder 38, air cylinder bottom plate 37, push rod 36, limit nut 42. The cylinder 38 is fixed on the cylinder bottom plate 37, the lower end of the cylinder rod is screwed and fixed with the push rod 36 with external thread on the cylindrical head, the outer diameter of the push rod 36 and the inner hole of the screw mandrel 35 form a clearance fit, and the two limit nuts 42 are connected together. Tightly be fixed on the cylinder rod of cylinder 38 upper ends.

The parking brake mechanism: includes a disc-shaped movable friction disc 40, a friction disc 39, which is set on the upper end step of the shaft sleeve body 3 and is fixed together with the synchronous pulley 10, and is pressed on the shaft sleeve body 3 by a nut 41. Pull rod 46, pre-compression spring 51, upper plate 43, screw 44 and nut 45. One end of two cylindrical pull rods 46 is fixed on the friction disc 39, passes through the upper end of the gearbox housing 20 and the cylinder bottom plate 37, and the contact position becomes clearance fit, and the other end and the upper plate 43 are fixed by screws. The upper plate 43 corresponds to the rod position of the cylinder, and has a threaded hole, which is screwed and tightly fixed with a height-adjustable screw 44 and a nut 45. Two pre-compressed springs 51 sleeved on the lower end of the pull rod 46 are compressed and installed between the upper end surface of the gearbox housing 20 and the friction disc 39 .

It works as follows:

When starting up, the air cylinder 38 takes in air, and the push rod 36 connected to the cylinder rod pushes down on the steel ball 7 and the step shaft 5 connected to the steel ball 7, and the inner shaft 4 carries the clamped tool to overcome the pressure of the return spring 6 Fast forward down. When the limit nut 42 fixed on the upper end of the cylinder rod hits the upper end surface of the cylinder 38, it is hindered and stops descending, and the idle stroke advances to a position. At the same time, the squirrel-cage motor 1 is energized and the shaft sleeve body 3 connected to the rotor core 2, drives the waterproof cover 8, the inner shaft 4 of the spline structure, the stepped shaft 5, the steel ball 7, the return spring 6, and the synchronous pulley 10. The moving friction disc 40 and the nut 41 rotate synchronously. The synchronous pulley 10 drives the lower synchronous pulley 12 and the gear fixing plate 16 and the gear 18 connected thereto to rotate in the same direction through the first synchronous belt 11 . The gear 18 and the gear 21 mesh, and when the gear 18 rotates, the gear 21 is synchronously driven to rotate in the opposite direction, and the gear fixing plate 22 connected to the gear 21 and the synchronous pulley 24 drive the synchronous wheel 30 and the connected main nut 31 through the synchronous belt 29 Also do opposite direction rotation simultaneously with compression nut 34.

Restricted by the bearing 32 and the compression nut 34 fixed on the gearbox casing 20, the main nut 31 rotates but cannot move up and down. The threaded mandrel 35 enclosed within the main nut 31 is restricted by two pull rods 46 passing through the upper end of the stationary gearbox casing 20, and cannot rotate. It is controlled by the reverse rotation of the main nut 31, with the cylinder bottom plate 37 and the cylinder 38 synchronously down a straight line. According to the pitch of the screw mandrel 35, by designing the size of each synchronous pulley and the number of teeth of the two gears, it can be achieved after the gearbox is shifted. Every time the synchronous pulley 10 rotates one circle, the main nut 31 after the speed change controls the screw rod 35 to move downward linearly according to the designed fixed value, and the cylinder bottom plate 37 and cylinder 38 connected with the screw rod 35 also move downward linearly synchronously. The push rod 36 connected with the protruding cylinder rod continues to push the steel ball 7 to move downwards linearly synchronously, and the stepped shaft 5 connected to the steel ball 7, and the inner shaft 4 with the clamped tool also continues to overcome the return The pressure of spring 6 moves downwards by the fixed value of design synchronously with screw mandrel 35. The splines in the middle of the rotating inner shaft 4 are fitted with the inner splines of the sleeve body 3, so that the tool mounted on the inner shaft 4 moves downward while rotating and enters the working stroke.

During work, the steel ball 7 rotates together with the step shaft 5 and always contacts and rubs against the non-rotating push rod 36 . When the limit screw 47 fixed on the cylinder bottom plate 37 moves downward and touches the travel switch 48, the external control electric device prompts the squirrel-cage motor 1 to reverse, and the main nut 31 is controlled to rotate synchronously to the other direction, and the screw mandrel 35, The push rod 36, the cylinder 38 and the cylinder bottom plate 37 also move linearly upwards according to the designed fixed value synchronously. When the stop screw 49 fixed on the cylinder bottom plate 37 touches the travel switch 50, the external control device impels the squirrel-cage motor 1 to stop. The cylinder 38 returns upwards, and the upper end of the cylinder rod pushes against the screw 44 fixed on the upper plate 43, driving the two pull rods 46 connected to the upper plate 43 and the same friction disc 39 to overcome the pressure of the two pre-compressed springs 51 and move upwards. When the friction disc 39 comes into contact with the dynamic friction disc 40 that is rotated together due to the inertial rotation of the motor, the resistance increases instantaneously, which overcomes the inertial rotation of the dynamic friction disc 39 and stops it. Inner shaft 4 and all rotating parts stop rotating synchronously, and a working procedure is completed.

When working again, the cylinder rod descends quickly, and the screw 44 that is out of contact is subjected to the effect of the pre-compression spring 51, and the friction disc 39 synchronously descends until it is attached to the lower end inner wall of the gearbox housing 20, and breaks away from the contact with the movable friction disc 40. contact, without interfering with the completion of the new duty cycle.

Claims (9)

1. the interior retractable synchronous tooth machining unit of axle of motor is characterized in that: comprise frame (9), squirrel cage motor (1), gearbox (19), screw nut driving mechanism, cylinder idle stroke quick mechanism and shut down braking mechanism; The interior axle retractable of described squirrel cage motor (1); its bottom is equipped with cutter; squirrel cage motor (1) is fixed on the frame (9); gearbox (19) is installed on the bonnet of squirrel cage motor (1); screw nut driving mechanism and shutdown braking mechanism are fixedly mounted in the gearbox (19); cylinder idle stroke quick mechanism is installed in the screw mandrel upper end of screw nut driving mechanism; described squirrel cage motor (1) is by match with screw nut driving mechanism the flexible of the interior axle that drives squirrel cage motor (1) and rotating of gearbox (19), advances and shuts down brake by cylinder idle stroke quick mechanism and the idle stroke of shutting down the interior axle of braking mechanism control squirrel cage motor (1).

2. synchronous tooth machining unit according to claim 1 is characterized in that: rotor core (2) the medium pore reaming of described squirrel cage motor (1), the rotor core after the reaming (2) internal diameter are not more than the internal diameter of fence cage in the rotor core (2); Electric machine main shaft is combined into interior axle (4) cover of corresponding stage casing band external splines by the sleeve body (3) of split type stage casing band internal spline, sleeve body (3) endoporus leading portion and back segment are cylindrical hole, interlude is internal spline, the leading portion external diameter is external screw thread, sleeve body (3) cylindrical is tightly fixed in rotor core (2) medium pore, interior axle (4) leading portion and back segment are optical axis, interlude is external splines, the bottom of optical axis is provided with for internal taper hole and external screw thread that chuck is installed, use a Step Shaft (5) front end threaded column to screw up and be fixed in the central, threaded hole of interior axle (4) rear end face setting, in the space that Step Shaft (5) forms the back segment optical axis of return spring (6) the compressing endoporus after the endoporus back segment of sleeve body (3) is internal spline and interior axle (4) simultaneously, overlap in the medium pore of Step Shaft (5) upper surface and put a steel ball (7); Waterproof cover (8) screws up on the external screw thread that is fixed on sleeve body (3) leading portion external diameter, and the end cap of squirrel cage motor (1) has certain matched in clearance.

3. synchronous tooth machining unit according to claim 1, it is characterized in that: institute's speed transmission comprises synchronous pulley (10), lower synchronous pulley and the gear fixing device that is installed on sleeve body (3) back segment, upper synchronous pulley and gear fixing device, the first Timing Belt (11), the second Timing Belt (12), synchronous pulley (30) and gear-box case (20), gear-box case (20) is fixed on the bonnet of squirrel cage motor (1) by screw integral body.

4. synchronous tooth machining unit according to claim 3 is characterized in that: described synchronous pulley (10), the external diameter stationary fit of its endoporus and sleeve body (3) back segment; Keyway in the endoporus is also corresponding with keyway on sleeve body (3) the back segment external diameter, and connects together by key and sleeve body (3).

5. synchronous tooth machining unit according to claim 3 is characterized in that: described lower synchronous pulley and gear fixing device: comprise lower synchronous pulley (12), bearing (15), lower bearing holder (13), bearing plate (14), gear fixed head (16), gear (18) and locating pin (17); In the lower synchronous pulley (12) concentric stepped hole is arranged, the stage casing cooperates is equipped with bearing (15), and the lower bearing holder (13) of a Step Shaft shape is arranged, and large end is fixed by screws on the gear-box case (20) small end and bearing (15) endoporus stationary fit; The large side pressure of the bearing plate of step plate-like (14) is on bearing (15) inner ring, small end becomes matched in clearance with the interior stepped hole of lower bearing holder (13), a screw passes the endoporus of bearing plate (14), bearing plate (14) connecting shaft is held (15) be fixed on the central, threaded hole of lower bearing holder (13); Step plate-like gear fixed head (16) with internal thread, be fixed on one heart lower synchronous pulley (12) central authorities by screw, in the gear (18) of concentric step wellhole is arranged, its step well internal diameter and the outer step stationary fit of gear fixed head (16) are fixed on the central authorities of gear fixed head (16) with one heart by screw and locating pin (17).

6. synchronous tooth machining unit according to claim 3 is characterized in that: described upper synchronous pulley and gear fixing device: comprise synchronous pulley (24), bearing (25), upper bearing (metal) holder (26), bearing plate (23), gear fixed head (22), gear (21), locating pin (17), pressing plate (27) and hold-down nut (28); Upper bearing (metal) holder (26) is installed the structure of bearing one end and mounting means and the lower bearing holder (13) of other parts of ining succession duplicates; The other end be cylindric, head with external screw thread, pass gear-box case (20) upper hole position and pressing plate (27) centre bore, by hold-down nut (28), screw up and be fixed on the gear-box case (20).

7. synchronous tooth machining unit according to claim 1, it is characterized in that: described screw nut driving mechanism: comprise the screw mandrel with endoporus (35) that is fixed on the cylinder base plate (37), be fixed by screws on the synchronous pulley (30), external form is concentric Step Shaft, the externally threaded mother nut of small end band (31), bearing (32), clamp nut (34) and bearing cover (33); The Step Shaft middle part external diameter of the internal diameter of bearing (32) and mother nut (31) becomes stationary fit; Clamp nut (34) screws up at the screw thread place of mother nut (31), pushes down the inner ring of bearing (32); The external diameter of bearing (32) becomes stationary fit with the stepped hole of gear-box case (20); Push down the outer ring of bearing (32) with the plate-like bearing cover (33) of stepped hole, be fixed on the gear-box case (20), screw mandrel (35) screws up and passes mother nut (31).

8. synchronous tooth machining unit according to claim 1, it is characterized in that: described cylinder idle stroke quick mechanism: comprise cylinder (38), cylinder base plate (37), push rod (36), stop nut (42), cylinder (38) is fixed on the cylinder base plate (37), cylinder rod lower end and the externally threaded push rod of cylindric head band (36) screw up fixing, push rod (36) external diameter becomes matched in clearance with screw mandrel (35) endoporus, and two stop nuts (42) also fasten on the cylinder rod of cylinder (38) upper end.

9. synchronous tooth machining unit according to claim 1 is characterized in that: described shutdown braking mechanism: comprise that the upper end step place and the synchronous pulley (10) that are sleeved on sleeve body (3) are fixed together, are pressed on plate-like dyanainic friction dish (40), grinding disk (39), pull bar (46), pretensioned spring (51), upper plate (43), screw (44) and nut (45) on the sleeve body (3) by nut (41); One end of described cylindric pull bar (46) is fixed on the grinding disk (39), passes gear-box case (20) upper end gentle cylinder bottom plate (37), and the contact position becomes matched in clearance, and the other end and upper plate (43) are fixed by screw; The corresponding cylinder rod of upper plate (43) position, one screwed hole is arranged, screw up and fasten screw (44) and nut (45) that capable of regulating height is housed, be enclosed within the pretensioned spring (51) of pull bar (46) lower end, compression is contained in gear-box case (between 20 interior upper surfaces and the frictional disk (39).

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