CN110695142A

CN110695142A - Straightening device for slender shaft parts without center holes

Info

Publication number: CN110695142A
Application number: CN201911056494.4A
Authority: CN
Inventors: 王忠新; 昌春海; 梁守开; 张永娟; 徐文清; 祝艳奇
Original assignee: LIUAN JIANGHUAI YONGDA MACHINERY MANUFACTURING CO LTD
Current assignee: LIUAN JIANGHUAI YONGDA MACHINERY MANUFACTURING CO LTD
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-01-17

Abstract

The invention discloses a straightening device for slender shaft parts without a central hole, which comprises a left support frame and a right support frame, wherein the left side of the left support frame and the right side of the right support frame are respectively provided with a tip mechanism, each tip mechanism comprises a tip base, a tip fixing seat, a tip shaft sleeve, a connecting sleeve and a floating adapter, when in work, two floating adapters of the two center mechanisms tightly support two ends of a shaft part without a central hole, pressure bearings at the upper ends of the left and right supporting frames move downwards to form a self-centering supporting mechanism for self-centering supporting of the shaft part together with the two supporting frames, the driving mechanism drives a center shaft sleeve of the driving center mechanism to rotate so as to drive the center and the floating adapters to rotate, and then the floating adapter, the center shaft sleeve and the center of the shaft part and the driven center mechanism are driven to synchronously rotate, and the rotary angle of the shaft part is recorded through a rotary encoder. The invention has the advantages that: the method can accurately straighten slender shaft parts without center holes and has low cost.

Description

Straightening device for slender shaft parts without center holes

Technical Field

The invention relates to a shaft part straightening tool, in particular to a slender shaft part straightening device without a central hole.

Background

The existing automatic shaft part straightening machine is applied to straightening slender shaft parts with center holes, and the existing double-center straightening device cannot meet the automatic straightening requirement aiming at slender shaft parts without center holes with higher coaxiality requirements. In the prior art, most slender shaft parts without center holes can be straightened only by purchasing special equipment of a three-roller straightening machine, the equipment investment value is high, special equipment is omitted, only manual straightening is adopted, the efficiency is low, and the straightening precision is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a straightening device for slender shaft parts without a central hole, so as to realize the purposes of accurately straightening slender shaft parts without a central hole and having low cost.

The invention is realized by the following technical scheme:

a straightening device for slender shaft parts without a central hole comprises a left support frame and a right support frame which are arranged on a machine tool linear rail, the shaft parts are supported by the left support frame and the right support frame, a displacement sensor is arranged between the left support frame and the right support frame, a measuring head of the displacement sensor is positioned below the shaft parts and is contacted with the surfaces of the shaft parts, tip mechanisms are respectively arranged on the left side of the left support frame and the right side of the right support frame, one opposite ends of the two tip mechanisms are inner ends,

each tip mechanism comprises a tip base, a tip fixing seat, a tip shaft sleeve, a connecting sleeve and a floating adapter, wherein the tip base is detachably mounted on a machine tool linear rail, the tip fixing seat is arranged on the tip base in a sliding mode, a left through mounting hole and a right through mounting hole are formed in the upper portion of the tip fixing seat, the tip shaft sleeve is rotatably mounted in the mounting hole of the tip fixing seat, the tip is fixed in an inner hole of the tip shaft sleeve, the part, extending out of the inner end of the tip shaft sleeve, of the tip end of the tip is an extending section of the tip, the connecting sleeve is fixedly sleeved on the extending section of the tip, the outer end of the floating adapter extends into the connecting sleeve, a centering hole used for accommodating the tip end of the tip is formed in the center of the outer end of the floating adapter, the tip end of the tip is in linear contact with the centering hole, and a lateral, the floating adapter is connected with the connecting sleeve, the diameter of a through hole in the side face of the connecting sleeve is larger than the outer diameter of the lateral screw, and a gap is reserved between the floating adapter and the connecting sleeve so as to realize the floating of the floating adapter in the connecting sleeve; the inner end of the floating adapter is provided with an insertion hole for inserting the end part of the shaft part, the insertion hole is a conical hole, and the taper of the insertion hole is consistent with the chamfer taper of the end part of the shaft part;

one of the two centre mechanisms is a driving centre mechanism, the other of the two centre mechanisms is a driven centre mechanism, the driving centre mechanism further comprises a driving mechanism, a centre shaft sleeve of the driven centre mechanism is connected with an extending shaft of the rotary encoder through a transmission mechanism, and the centre shaft sleeve of the driven centre mechanism and the extending shaft of the rotary encoder realize synchronous rotation;

when the device works, two floating adapters of two center mechanisms tightly push two ends of a shaft part without a central hole, a driving mechanism drives a center shaft sleeve of a driving center mechanism to rotate, so that a center and the floating adapters of the driving center mechanism are driven to rotate, the floating adapters, the center shaft sleeves and the centers of the shaft part and a driven center mechanism are driven to synchronously rotate, the center shaft sleeve of the driven center mechanism drives an extension shaft of a rotary encoder to synchronously rotate through a transmission mechanism, and the rotary angle of the shaft part is recorded through the rotary encoder;

a pressurizing assembly is arranged above a tip fixing seat of each tip mechanism respectively, the pressurizing assembly comprises a pressurizing mounting plate, a pressurizing cylinder, a pressure seat and a pressurizing bearing, the pressurizing mounting plate is mounted on the tip fixing seat, the pressurizing cylinder is mounted on the pressurizing mounting plate, a piston rod of the pressurizing cylinder vertically extends downwards and is fixedly connected with the pressure seat, a pressure hole parallel to the axial lead of a tip shaft sleeve is formed in the pressure seat, a pressure shaft is fixedly mounted in the pressure hole, the inner end of the pressure shaft extends out of the pressure hole and is fixedly sleeved with the pressurizing bearing, the pressurizing bearing is positioned above the shaft part, and the pressurizing bearing is driven by the pressurizing cylinder to vertically move so as to drive the pressurizing bearing to press the shaft part from the upper part; the two pressurizing bearings and the two support frames form a self-centering supporting mechanism for self-centering supporting of the shaft parts.

Furthermore, two pressurizing bearings of the two tip mechanisms are respectively positioned right above the left support frame and the right support frame.

Furthermore, in the driving center mechanism, the driving mechanism comprises a motor, a first driving pulley, a first driven pulley and a first synchronous belt, the first driven pulley is fixed on the center shaft sleeve, the motor is mounted on the center fixing seat through a motor mounting plate, the first driving pulley is fixed on an output shaft of the motor, and the first driving pulley is in transmission connection with the first driven pulley through the first synchronous belt.

Furthermore, in the driven centre mechanism, the transmission mechanism comprises a second driving belt wheel, a second driven belt wheel and a second synchronous belt, the second driving belt wheel is fixed on the centre shaft sleeve, the second driven belt wheel is fixed on an extending shaft of the rotary encoder, and the second driving belt wheel and the second driven belt wheel are in transmission connection through the second synchronous belt.

Furthermore, the inner end of the floating adapter is provided with a rectangular open slot which is through along the radial direction.

Furthermore, every top mechanism still includes top actuating cylinder, top actuating cylinder installs on top base, top actuating cylinder's piston rod along left right direction level stretch out and with top fixing base fixed connection, drive top fixing base along left right direction round trip movement through top actuating cylinder, and then drive two top mechanism's top fixing base and draw close each other or keep away from each other.

Furthermore, a section of an inner hole of the center shaft sleeve close to the inner end is a Morse taper hole, a section of outer wall of the center close to the outer end is a Morse taper outer wall, and the center is detachably connected with the center shaft sleeve through matching of the Morse taper outer wall and the Morse taper hole.

Furthermore, the top shaft sleeve is rotatably connected with the mounting hole of the top fixing seat through two deep groove ball bearings, a thrust ball bearing is further arranged between the two deep groove ball bearings, the thrust ball bearing and the two deep groove ball bearings are separated through an outer ring spacer and an inner ring spacer respectively, the inner ring spacer is abutted against the inner ring of the deep groove ball bearing on one side corresponding to the inner ring spacer, the outer ring spacer is abutted against the outer ring of the deep groove ball bearing on one side corresponding to the outer ring spacer, and the outer ring spacer is used for limiting the axial direction and the circumferential direction of the thrust ball bearing.

Furthermore, be equipped with a plurality of displacement sensor between left and right support frame, a plurality of displacement sensor along the even setting of left and right direction interval.

Compared with the prior art, the invention has the following advantages:

1. the straightening device for slender shaft parts without the central hole, provided by the invention, can perform self-centering on the shaft parts through a self-centering supporting mechanism formed by two pressurizing bearings and two supporting frames; the inner ends of the two tops are respectively connected with a floating rotating head through a connecting sleeve, the two ends of the shaft part without the central hole are tightly pushed through the jacks of the two floating adapters, and the shaft part without the central hole is accurately detected and accurately straightened by matching a rotary encoder and a displacement sensor. In addition, when being directed at the axle type part of taking the centre bore, only need remove corresponding connecting sleeve and float the rotating head can, all can carry out the alignment to the axle type part of taking the centre bore and the axle type part that does not take the centre bore, the commonality is strong, and the alignment of two kinds of axle type parts switches convenient and fast, maneuverability is strong.

2. According to the straightening device for the slender shaft type part without the central hole, provided by the invention, two groups of pressurizing assemblies are additionally arranged above the shaft type part, the pressurizing assemblies are pressed from the upper part of the shaft type part through the pressurizing bearings, and the two pressurizing bearings and the two supporting frames jointly form the reference center of the straightened shaft type part, so that a gap is eliminated, the positioning precision is ensured, the unification of a detection reference and a straightening reference is ensured, and the straightening precision is further ensured.

3. According to the straightening device for the slender shaft type part without the center hole, provided by the invention, the position of the shaft type part needing to be straightened in the axial direction is confirmed through the displacement sensor, the position of the shaft type part needing to be straightened in the circumferential direction is detected and confirmed through the rotary encoder, so that the straightening position of the shaft type part is accurately determined, the computer judges the maximum bending value of the workpiece and the position and the direction of the maximum bending value according to data, and sends an instruction to stop the workpiece from rotating when the maximum bending point of the workpiece faces upwards, so that the accuracy of the straightening position is ensured, and the accurate straightening of the part is ensured.

4. The invention provides a straightening device for slender shaft parts without a central hole, wherein a floating adapter can radially float in a connecting sleeve by taking the tip end of a tip as the center, so that the movement interference caused by the fact that the floating adapters at two ends are not concentric with the reference center of a straightened part when the straightened part is tightly propped against the floating adapter at the two ends and is driven to rotate can be avoided.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is an assembled perspective view of the tip and the tip holder of the present invention.

Fig. 4 is a cross-sectional view of the connection of the tip and the tip holder of the present invention.

Fig. 5 is a perspective view of the live center mechanism of the present invention.

Fig. 6 is a side view of the live center mechanism of the present invention.

Fig. 7 is a perspective view of the driven tip mechanism of the present invention.

Figure 8 is a top view of the driven tip mechanism of the present invention.

Figure 9 is a cross-sectional view of the floating adapter and tip connection of the present invention.

Figure 10 is a perspective view of the floating adapter of the present invention.

Fig. 11 is a perspective view of a shaft component of the present invention.

Fig. 12 is a perspective view of the pressing assembly of the present invention.

Reference numbers in the figures: 1 machine tool linear rail, 2 left support frame, 3 right support frame, 4 displacement sensor, 5 measuring head, 6 shaft parts, 7 driving center mechanism, 8 driven center mechanism, 9 center base, 10 center fixing base, 11 center, 12 center shaft sleeve, 13 connecting sleeve, 14 floating adapter, 15 deep groove ball bearing, 16 bearing end cover, 17 thrust ball bearing, 18 outer ring spacer, 19 inner ring spacer, 20 mounting screw, 21 tip end, 22 centering hole, 23 side screw, 24 jack, 25 chamfer, 26 plane structure, 27 rectangular open slot, 28 center driving cylinder, 29 rotary encoder, 30 motor, 31 first driving belt wheel, 32 first driven belt wheel, 33 first synchronous belt, 34 second driving belt wheel, 35 second driven belt wheel, 36 second synchronous belt, 37 pressurizing mounting plate, 38 pressurizing cylinder, 39 pressure seat, 40 pressurizing bearing, 41 pressure shaft, 42 support frame base, 43 sensor base, 44 pressure head.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

Referring to fig. 1 to 12, the present embodiment discloses a straightening device for slender shaft parts without a center hole, which includes a left support frame and a right support frame disposed on a machine tool wire rail 1, wherein V-shaped support grooves are respectively disposed at the tops of the left support frame and the right support frame, and the shaft parts 6 are supported by the two V-shaped support grooves. Be equipped with contact displacement sensor 4 between left and right support frame, displacement sensor 4 can set up a plurality ofly, and a plurality of displacement sensor 4 are along controlling the even setting of direction interval, and displacement sensor 4's gauge head 5 is located the below of axle type part 6 and contacts with 6 surfaces of axle type part.

The left side of the left support frame 2 and the right side of the right support frame 3 are respectively provided with a tip mechanism, and the opposite ends of the two tip mechanisms are inner ends. Each centre mechanism comprises a centre base 9, a centre fixing seat 10, a centre 11, a centre shaft sleeve 12, a connecting sleeve 13 and a floating adapter 14, wherein the centre base 9 is detachably arranged on a machine tool line rail 1, the centre fixing seat 10 is arranged on the centre base 9 in a sliding manner, the upper part of the centre fixing seat 10 is provided with a mounting hole which is through from left to right, the centre shaft sleeve 12 is rotatably arranged in the mounting hole of the centre fixing seat 10, the centre shaft sleeve 12 is rotatably connected with the mounting hole of the centre fixing seat 10 through two deep groove ball bearings 15, the outer sides of the two deep groove ball bearings 15 are respectively limited through bearing end covers 16, a thrust ball bearing 17 is further arranged between the two deep groove ball bearings 15, the thrust ball bearing 17 and the two deep groove ball bearings 15 are respectively separated through an outer ring spacer 18 and an inner ring spacer 19, and the spacer 19 is abutted against the inner ring, the outer ring spacer 18 abuts against the outer ring of the deep groove ball bearing 15 on the corresponding side, and the outer ring spacer 18 limits the axial direction and the circumferential direction of the thrust ball bearing 17.

The centre 11 is fixed in the hole of centre axle sleeve 12, and the section of the hole of centre axle sleeve 12 near the inner end is the morse taper hole, and the section of the outer wall of centre 11 near the outer end is the morse taper outer wall, and through the cooperation of morse taper outer wall and morse taper hole, the removable connection between centre 11 and centre axle sleeve 12 is realized. The part of the tip end 21 of the tip 11 extending out of the inner end of the tip shaft sleeve 12 is an extending section of the tip 11, a connecting sleeve 13 is fixedly sleeved on the extending section of the tip 11, an inner hole of the connecting sleeve 13 is a step hole which is through from left to right, a large-end straight hole and a small-end straight hole of the inner hole of the connecting sleeve 13 are in transition through taper holes, the large-end straight hole of the inner hole of the connecting sleeve 13 is fixedly matched with the outer wall of the inner end of the tip 11, the small-end straight hole of the inner hole of the connecting sleeve 13 is in clearance fit with the outer wall of the outer end of the floating adapter 14, a centering hole 22 used for accommodating the tip end 21 of the tip 11 is formed in the center of the outer end of the floating adapter 14, line contact is formed between the tip end 21 of the tip 11 and the centering hole 22, a lateral screw 23 penetrates through the through hole of the connecting sleeve 13 and, the diameter of a through hole on the side surface of the connecting sleeve 13 is larger than the outer diameter of the lateral screw 23, and a gap is reserved between the floating adapter 14 and the connecting sleeve 13 so as to realize the radial floating of the floating adapter 14 in the connecting sleeve 13; the inner end of the floating adapter 14 is provided with an insertion hole 24 for inserting the end of the shaft part 6, the insertion hole 24 is a tapered hole, the taper of the insertion hole 24 is consistent with the taper of the chamfer 25 at the end of the shaft part 6, and the diameter of the large end of the insertion hole 24 is larger than the diameter of the outer circle of the end of the straightened shaft part 6, so that the tapered insertion hole 24 of the floating adapter 14 and the chamfer 25 at the end of the straightened shaft part 6 are in friction driving and float along the center of the tip end 21 of the tip 11 in the radial direction.

In this embodiment, because one end of the straightened shaft part 6 is in a chamfer 25 structure, and the other end of the straightened shaft part is in two planar structures 26 formed by cutting off the two sides of the straightened shaft part on the basis of the chamfer 25 structure, for the part with such a structure, a rectangular opening groove 27 penetrating in the radial direction can be formed at the inner end of the floating adapter 14, so that the end part of the shaft part 6 with the two planar structures 26 can be inserted into the rectangular opening groove 27.

Every top mechanism still includes top actuating cylinder 28, and top actuating cylinder 28 is installed on top base 9, and top actuating cylinder 28's piston rod stretches out and with top fixing base 10 fixed connection along left right direction level, drives top fixing base 10 along left right direction round trip movement through top actuating cylinder 28, and then drives two top mechanism's top fixing base 10 and draw close each other or keep away from each other.

One of the two centre mechanisms is a driving centre mechanism 7, the other one is a driven centre mechanism 8, the driving centre mechanism 7 further comprises a driving mechanism, a centre shaft sleeve 12 of the driven centre mechanism 8 is connected with an extending shaft of a rotary encoder 29 through a transmission mechanism, and the centre shaft sleeve 12 of the driven centre mechanism 8 and the extending shaft of the rotary encoder 29 realize synchronous rotation.

In the driving center mechanism 7, the driving mechanism comprises a motor 30, a first driving pulley 31, a first driven pulley 32 and a first synchronous belt 33, the first driven pulley 32 is fixed on the center shaft sleeve 12, the motor 30 is installed on the center fixing seat 10 through a motor 30 mounting plate, the first driving pulley 31 is fixed on an output shaft of the motor 30, and the first driving pulley 31 is in transmission connection with the first driven pulley 32 through the first synchronous belt 33.

In the driven centre mechanism 8, the transmission mechanism comprises a second driving pulley 34, a second driven pulley 35 and a second synchronous belt 36, the second driving pulley 34 is fixed on the centre shaft sleeve 12, the second driven pulley 35 is fixed on an extending shaft of the rotary encoder 29, and the second driving pulley 34 is in transmission connection with the second driven pulley 35 through the second synchronous belt 36.

During operation, two unsteady adapter 14 of two top mechanisms push up tightly 6 both ends of axle type part that do not have the centre bore, it is rotatory to drive top axle sleeve 12 of initiative top mechanism 7 through actuating mechanism, thereby it is rotatory to drive top 11 and unsteady adapter 14 of initiative top mechanism 7, and then drive axle type part 6 and unsteady adapter 14 of driven top mechanism 8, top axle sleeve 12, top 11 synchronous revolution, top axle sleeve 12 rethread drive mechanism of driven top mechanism 8 drives the protruding axle synchronous revolution of rotary encoder 29, record the gyration angle of axle type part 6 through rotary encoder 29.

Specifically, a pressurizing assembly is arranged above the tip fixing seat 10 of each tip mechanism, the pressurizing assembly comprises a pressurizing mounting plate 37, a pressurizing cylinder 38, a pressure seat 39 and a pressurizing bearing 40, the pressurizing mounting plate 37 is mounted on the tip fixing seat 10, the pressurizing cylinder 38 is mounted on the pressurizing mounting plate 37, a piston rod of the pressurizing cylinder 38 vertically extends downwards and is fixedly connected with the pressure seat 39, a pressure hole parallel to the axial lead of the tip shaft sleeve 12 is formed in the pressure seat 39, a pressure shaft 41 is fixedly mounted in the pressure hole, the inner end of the pressure shaft 41 extends out of the pressure hole and is fixedly sleeved with the pressurizing bearing 40, the pressurizing bearing 40 is positioned above the shaft part 6, and the pressurizing bearing 40 is driven by the pressurizing cylinder 38 to vertically move so as to drive the pressurizing bearing 40 to press the shaft part 6 from the upper part; the two pressure bearings 40 and the two support frames jointly form a self-centering supporting mechanism for self-centering supporting of the shaft part 6, each pressure bearing 40 presses the shaft part 6 in the V-shaped groove of the corresponding support frame, and then the two pressure bearings 40 and the V-shaped grooves of the two support frames jointly form two groups of three-point self-centering supporting mechanisms.

Two pressurizing bearings 40 of the two tip mechanisms are respectively positioned right above the left and right supporting frames.

The left and right support frames are respectively installed on a machine tool linear rail 1 through support frame bases 42, the displacement sensor 4 is installed on the machine tool linear rail 1 through a sensor base 43, the machine tool linear rail 1 extends along the left and right directions, the bottoms of the support frame bases 42, the sensor bases 43 and the tip bases 9 are respectively connected with the machine tool linear rail 1 in a sliding mode, and the position fixing among the support frame bases 42, the sensor bases 43 and the tip bases 9 and the machine tool linear rail 1 is achieved through mounting screws 20.

The working process of the straightening device provided by the embodiment is as follows:

the manipulator places the straightened slender shaft part 6 without the central hole on the V-shaped grooves of the left and right support frames, the left and right centre driving cylinders 28 act to push the left and right centre fixing seats 10 to approach each other until the floating adapters 14 on the two centres 11 contact with the two ends of the straightened shaft part 6, the two centre driving cylinders 28 stop acting, and at the moment, the straightened shaft part 6 slightly breaks away from the two support frames. Meanwhile, the pressurizing components above the driving center mechanism 7 and the driven center mechanism 8 act, namely, the two pressurizing cylinders 38 drive the two pressurizing bearings 40 to move downwards, the inner rings of the pressurizing bearings 40 are fixedly connected to the pressure shaft 41, the outer rings of the pressurizing bearings 40 are in contact with the outer circle of the straightened shaft part 6 to synchronously rotate, and the outer rings and the tangent points of the straightened shaft part 6 on the two side surfaces of the V-shaped groove of the support frame form the reference center of the straightened shaft part 6 together.

Then the motor 30 of the driving center mechanism 7 is started to drive the first driving belt wheel 31 to rotate, the first driving belt wheel 31 drives the first driven belt wheel 32 to synchronously rotate through the first synchronous belt 33, the rotating motion is transmitted to the center shaft sleeve 12 to enable the center 11 to rotate, and the center 11 is in contact friction with one end of the straightened shaft part 6 through the floating adapter 14 connected to the center 11 to drive the straightened shaft part 6 to synchronously rotate. A floating adapter 14 connected with a tip 11 on the driven tip mechanism 8 is in contact with the other end of the straightened shaft part 6, and the floating adapter 14 of the driven tip mechanism 8 is driven to float and rotate through friction. At the moment, a measuring head 5 of a displacement sensor 4 below a straightened shaft part 6 is in contact with the straightened shaft part 6, and the value of the maximum jumping position of the shaft part 6 is fed back to an equipment system and recorded; the centre 11 of the driven centre mechanism 8 transmits the rotary motion to the centre shaft sleeve 12, the second driving belt wheel 34 on the centre shaft sleeve 12 is driven to coaxially rotate, the second driving belt wheel 34 drives the second driven belt wheel 35 to synchronously rotate through the second synchronous belt 36, and the signal of the rotating angle of the second driven belt wheel 35 is fed back into the equipment system through the rotary encoder 29 and recorded. The computer judges the maximum bending value, the position and the direction of the shaft part 6 according to the data, and sends out an instruction to stop the shaft part 6 when the maximum bending point of the shaft part 6 faces upwards, so that the downward pressure and the downward pressing position of the pressure head 44 can be determined. After the pressing position is confirmed, the floating adapters 14 at the two ends and the two pressurizing bearings 40 are withdrawn, the part of the shaft part 6 needing to be straightened is placed under the pressure head 44, and then the pressure head 44 is pressed down, so that the shaft part 6 can be straightened. Therefore, the beating of the slender shaft type part 6 without the central hole can be detected and straightened in real time.

The straightening device that this embodiment provided simple structure is compact, easy to operate, when being directed at axle type part 6 of taking the centre bore, only need remove corresponding connecting sleeve 13 and float the swivel head can, to taking axle type part 6 of centre bore and all can straightening with the axle type part 6 of not taking the centre bore, the commonality is strong, and the alignment of two kinds of axle type parts 6 switches convenient and fast, maneuverability is strong.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. There is not slender axles class part coalignment of centre bore, including setting up left and right support frame on lathe line rail (1), support axle class part (6) through left and right support frame, be equipped with displacement sensor (4) between left and right support frame, gauge head (5) of displacement sensor (4) are located the below of axle class part (6) and contact with axle class part (6) surface, and the left side of left branch strut (2), the right side of right branch strut (3) are equipped with top mechanism respectively, and the relative one end of two top mechanisms is inner, its characterized in that:

each tip mechanism comprises a tip base (9), a tip fixing seat (10), a tip (11), a tip shaft sleeve (12), a connecting sleeve (13) and a floating adapter (14), wherein the tip base (9) is detachably mounted on a machine tool line rail (1), the tip fixing seat (10) is slidably arranged on the tip base (9), a left and right through mounting hole is formed in the upper portion of the tip fixing seat (10), the tip shaft sleeve (12) is rotatably mounted in the mounting hole of the tip fixing seat (10), the tip (11) is fixed in an inner hole of the tip shaft sleeve (12), the part, extending out of the inner end of the tip shaft sleeve (12), of a tip end (21) of the tip (11) is an extending section of the tip (11), the extending section of the tip (11) is fixedly sleeved with the connecting sleeve (13), and the outer end of the floating adapter (14) extends into the connecting sleeve (13), the center of the outer end of the floating adapter (14) is provided with a centering hole (22) for accommodating a tip end (21) of the tip (11), the tip end (21) of the tip (11) is in line contact with the centering hole (22), a lateral screw (23) penetrates through a through hole of the connecting sleeve (13) and then is screwed into a threaded hole of the floating adapter (14), so that the floating adapter (14) is connected with the connecting sleeve (13), the diameter of the through hole on the side surface of the connecting sleeve (13) is larger than the outer diameter of the lateral screw (23), and a gap is reserved between the floating adapter (14) and the connecting sleeve (13) to realize the floating of the floating adapter (14) in the connecting sleeve (13); the inner end of the floating adapter (14) is provided with an insertion hole (24) for inserting the end part of the shaft part (6), the insertion hole (24) is a conical hole, and the taper of the insertion hole (24) is consistent with that of a chamfer (25) at the end part of the shaft part (6);

one of the two centre mechanisms is a driving centre mechanism (7), the other one is a driven centre mechanism (8), the driving centre mechanism (7) further comprises a driving mechanism, a centre shaft sleeve (12) of the driven centre mechanism (8) is connected with an extension shaft of a rotary encoder (29) through a transmission mechanism, and the centre shaft sleeve (12) of the driven centre mechanism (8) and the extension shaft of the rotary encoder (29) realize synchronous rotation;

when the automatic centering device works, two floating adapters (14) of two centering mechanisms tightly push two ends of a shaft part (6) without a central hole, a driving mechanism drives a centering shaft sleeve (12) of a driving centering mechanism (7) to rotate, so that a centering head (11) and the floating adapter (14) of the driving centering mechanism (7) are driven to rotate, the floating adapters (14), the centering shaft sleeve (12) and the centering head (11) of the shaft part (6) and a driven centering mechanism (8) are driven to synchronously rotate, the centering shaft sleeve (12) of the driven centering mechanism (8) drives an extension shaft of a rotary encoder (29) to synchronously rotate through a transmission mechanism, and the rotary angle of the shaft part (6) is recorded through the rotary encoder (29);

a pressurizing assembly is arranged above the tip fixing seat (10) of each tip mechanism respectively, the pressurizing assembly comprises a pressurizing mounting plate (37), a pressurizing cylinder (38), a pressure seat (39) and a pressurizing bearing (40), the pressurizing mounting plate (37) is mounted on the tip fixing seat (10), the pressurizing cylinder (38) is mounted on the pressurizing mounting plate (37), a piston rod of the pressurizing cylinder (38) vertically extends downwards and is fixedly connected with the pressure seat (39), a pressure hole parallel to the axial lead of the tip shaft sleeve (12) is formed in the pressure seat (39), a pressure shaft (41) is fixedly mounted in the pressure hole, the inner end of the pressure shaft (41) extends out of the pressure hole and is fixedly sleeved with the pressurizing bearing (40), the pressurizing bearing (40) is positioned above the shaft part (6), and the pressurizing bearing (40) is driven to vertically move through the pressurizing cylinder (38), thereby driving the pressurizing bearing (40) to press the shaft part (6) from the upper part; the two pressure bearings (40) and the two support frames jointly form a self-centering supporting mechanism for self-centering supporting of the shaft part (6).

2. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: two pressurizing bearings (40) of the two tip mechanisms are respectively positioned right above the left support frame and the right support frame.

3. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: in the driving center mechanism (7), the driving mechanism comprises a motor (30), a first driving belt wheel (31), a first driven belt wheel (32) and a first synchronous belt (33), the first driven belt wheel (32) is fixed on a center shaft sleeve (12), the motor (30) is installed on a center fixing seat (10) through a motor (30) installing plate, the first driving belt wheel (31) is fixed on an output shaft of the motor (30), and the first driving belt wheel (31) is in transmission connection with the first driven belt wheel (32) through the first synchronous belt (33).

4. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: in the driven centre mechanism (8), the transmission mechanism comprises a second driving belt wheel (34), a second driven belt wheel (35) and a second synchronous belt (36), the second driving belt wheel (34) is fixed on the centre shaft sleeve (12), the second driven belt wheel (35) is fixed on an extending shaft of the rotary encoder (29), and the second driving belt wheel (34) is in transmission connection with the second driven belt wheel (35) through the second synchronous belt (36).

5. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: the inner end of the floating adapter (14) is provided with a rectangular open slot (27) which penetrates through along the radial direction.

6. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: every top mechanism still includes top actuating cylinder (28), top actuating cylinder (28) are installed on top base (9), the piston rod of top actuating cylinder (28) is stretched out and with top fixing base (10) fixed connection along left right direction level, drive top fixing base (10) along left right direction round trip movement through top actuating cylinder (28), and then drive top fixing base (10) of two top mechanisms and draw close each other or keep away from each other.

7. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: the section of the inner hole of the centre shaft sleeve (12) close to the inner end is a Morse taper hole, the section of the outer wall of the centre (11) close to the outer end is a Morse taper outer wall, and the removable connection between the centre (11) and the centre shaft sleeve (12) is realized through the matching of the Morse taper outer wall and the Morse taper hole.

8. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: the rotary connection is realized between the mounting holes of the tip shaft sleeve (12) and the tip fixing seat (10) through two deep groove ball bearings (15), a thrust ball bearing (17) is further arranged between the two deep groove ball bearings (15), the thrust ball bearing (17) and the two deep groove ball bearings (15) are separated through an outer ring spacer (18) and an inner ring spacer (19), the inner ring spacer (19) is abutted to the inner ring of the deep groove ball bearing (15) on one side corresponding to the inner ring spacer, the outer ring spacer (18) is abutted to the outer ring of the deep groove ball bearing (15) on one side corresponding to the outer ring spacer, and the outer ring spacer (18) is used for limiting the axial direction and the circumferential direction of the thrust ball bearing (17).

9. The straightening device for slender shaft parts without central holes as claimed in claim 1, wherein: a plurality of displacement sensors (4) are arranged between the left support frame and the right support frame, and the plurality of displacement sensors (4) are uniformly arranged at intervals in the left-right direction.