CN216939317U - Nozzle replacing device - Google Patents

Abstract

The utility model relates to the technical field of automatic equipment, in particular to a nozzle replacing device, wherein a feeding device can be used for placing a plurality of nozzles and sending the nozzles to a replacing station, the replacing device is arranged on a rack and is driven to the replacing station through the rack to replace the nozzles, the replacing device comprises a first driving assembly, a connecting piece and a locking sleeve, the first driving assembly is used for driving the connecting piece and the locking sleeve to move relatively to realize locking fixation or unlocking separation of the nozzles, and the replacing device is matched with the feeding device to realize automatic replacement of new and old nozzles at the replacing station. The monitoring assembly comprises a distance sensor and a correlation sensor, and when a new nozzle is manually placed in the placement groove, the sensing column corresponding to the placement groove needs to be pulled out. And detecting the induction column through the distance sensor, and determining whether the old nozzle is placed in the empty placement groove. When taking a new nozzle, whether the corresponding placing groove has the nozzle or not is detected through the correlation sensor, the new nozzle is locked and taken away by the replacing device, and emptying is prevented.

Description

Nozzle replacing device

Technical Field

The utility model relates to the technical field of automation equipment, in particular to a nozzle replacing device.

Background

The nozzle is an important element on welding equipment, the quality of the nozzle can directly influence the welding quality, and in order to ensure that the nozzle can work stably under the designed technological parameters, the nozzle needs to be periodically detached from the welding equipment for cleaning and maintenance. The change of present nozzle all relies on the manual work to go on, when welding equipment need change the nozzle in the use, appears the condition that personnel scalded in the dismantlement in-process of nozzle easily, and because the manual work is changed unskilled of operation, leads to the time consuming to have a long time or a short time, still can cause the nozzle to damage, influences welding equipment performance.

In view of the above problems, the present designer is actively making research and innovation based on the practical experience and professional knowledge that is abundant for many years in the engineering application of such products, in order to create a nozzle replacement device to make it more practical.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a nozzle replacing device aiming at the defects in the prior art.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a nozzle exchange device comprising: the nozzle replacing device comprises a rack, a replacing device and a feeding device, wherein the feeding device can be used for placing a plurality of nozzles and sending the nozzles to a replacing station, and the replacing device is arranged on the rack and is driven to the replacing station through the rack to replace the nozzles;

the replacing device comprises a first driving assembly, a connecting piece and a locking sleeve, wherein the connecting piece is hung at the bottom of the rack and used for connecting the nozzle, the locking sleeve is sleeved on an outer ring of the connecting piece and can move along the length direction of the connecting piece, and the first driving assembly can drive the locking sleeve to move and cooperate with the connecting piece to lock and fix the nozzle or unlock and separate the nozzle;

the feeding device comprises a second driving assembly, a feeding rotary table and a monitoring assembly, wherein the feeding rotary table is provided with a plurality of arrangement grooves for placing nozzles, the second driving assembly drives the feeding rotary table to rotate, and the monitoring assembly is used for detecting whether the nozzles are arranged in the arrangement grooves or not.

Furthermore, two ends of the connecting piece are arranged in a through mode and comprise a connecting part and a fixing part, the connecting part is fixedly connected with the rack, the locking sleeve is arranged corresponding to the fixing part, a limiting hole is formed in the fixing part, and a retaining ring is arranged at one end, close to the connecting part, of the fixing part;

the through-hole of lock sleeve is provided with first portion and second part along its axial be provided with the bulge loop between the first portion with the second part, the first part cover is established keep off the ring outer lane the outer lane cover of fixed part is equipped with compression spring, compression spring's both ends respectively with keep off the ring with bulge loop looks butt, the second part cover is established fixed part outer lane and cooperation its outer wall form spacing chamber be provided with the stopper in the spacing chamber, the lock sleeve removes and drives the stopper is followed spacing hole is outstanding or is returned.

Furthermore, a plurality of limiting holes are formed in the circumferential direction of the fixing part, a clamping ring is arranged at one end, away from the locking sleeve, of each limiting hole, and the outline of each limiting block is larger than the inner ring of the clamping ring and smaller than the limiting hole;

the stopper corresponds spacing hole sets up to globular piece, just the diameter of stopper is less than the diameter in spacing hole is greater than the internal diameter of snap ring, the second part is close to the one end of bulge loop sets up to drawing in the structure in, and its internal diameter orientation the bulge loop reduces gradually, the stopper is close to the bulge loop sets up.

Further, a driving ring is arranged on the outer ring of the locking sleeve, and the first driving assembly is fixedly connected with the driving ring and drives the locking sleeve to move through the driving ring.

Furthermore, the first driving assembly comprises a first cylinder, a pull rope and a fixed block, the first cylinder is arranged on the rack, the fixed block is fixedly connected with the driving ring, and two ends of the pull rope are respectively fixedly connected with an output shaft of the first cylinder and the fixed block.

Further, the first driving assembly comprises a second cylinder and a mounting plate, the mounting plate is parallel to the driving ring and is arranged on the connecting portion, the second cylinder is fixed on the mounting plate along the vertical direction, and an output shaft of the second cylinder faces the driving ring and is fixedly connected with the driving ring.

Furthermore, the second driving assembly is arranged on the supporting plate and comprises a stepping motor, a synchronous belt, a first synchronous wheel and a second synchronous wheel;

the first synchronizing wheel coaxially rotates along with an output shaft of the stepping motor, the second synchronizing wheel is coaxially arranged with the feeding turntable, and the outer ring of the first synchronizing wheel and the outer ring of the second synchronizing wheel are sleeved with the synchronizing belt.

Furthermore, the plurality of arrangement grooves are formed in the edge of the feeding turntable along the circumferential direction of the feeding turntable, a plurality of induction columns are arranged corresponding to the plurality of arrangement grooves, and the induction columns are arranged close to the arrangement grooves;

the induction column is pressed downwards and protrudes out of the bottom of the feeding rotary table, and the radial size of the induction column on the feeding rotary table is smaller than that of the placement groove.

Further, the monitoring subassembly sets up in the backup pad, including distance sensor and correlation sensor, distance sensor can detect with interval between the response post, correlation sensor can detect whether there is the nozzle in the resettlement groove.

Furthermore, the distance sensor corresponds to the induction column and is located below the feeding rotary table, and the correlation sensor corresponds to the placement groove and is located at the replacement station and above the feeding rotary table.

The utility model has the beneficial effects that:

the nozzle is locked and fixed or unlocked and separated through the relative movement of the connecting piece and the locking sleeve, and the replacement device is matched with a feeding device to realize the automatic replacement of a new nozzle and an old nozzle at a replacement station;

and when the old nozzle is placed in the placing groove, the induction column is pressed down, the induction column is detected by the distance sensor, and whether the old nozzle is placed in the empty placing groove is determined. When a new nozzle is manually placed in the placing groove, the induction column corresponding to the placing groove needs to be pulled out; therefore, the new nozzle and the old nozzle can be rapidly distinguished through the matching of the induction column and the distance sensor. When the old nozzle is replaced, the nozzle is not arranged in the corresponding arranging groove through the detection of the opposite jetting sensor, so that the phenomenon that the replacing device descends to cause collision when the nozzle is arranged is prevented; when taking a new nozzle, whether the corresponding placing groove has the nozzle or not is detected through the correlation sensor, the new nozzle is locked and taken away by the replacing device, and emptying is prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a nozzle changer according to the present invention;

FIG. 2 is a schematic structural view of a feeding device in the present invention;

FIG. 3 is a schematic view of an exploded structure of the charging device of the present invention;

FIG. 4 is a schematic view of the mounting of the changing device on the frame of the present invention;

FIG. 5 is a schematic view of the replacing device according to the present invention;

FIG. 6 is a schematic view of the engagement of the connector and locking sleeve of the present invention;

FIG. 7 is a schematic cross-sectional view of FIG. 6;

FIG. 8 is a schematic diagram of the exploded structure of FIG. 7;

FIG. 9 is an enlarged view of a portion of the structure at A in FIG. 8;

FIG. 10 is another embodiment of the first drive assembly of the present invention;

FIG. 11 is a schematic view of the structure of a nozzle according to the present invention;

fig. 12 is a schematic view of the replacement of the nozzle in the present invention.

Reference numerals: 1. a frame; 2. replacing the device; 3. a feeding device; 4. a first drive assembly; 41. a first cylinder; 42. pulling a rope; 43. a fixed block; 44. a second cylinder; 45. mounting a plate; 5. a connecting member; 51. a connecting portion; 52. a fixed part; 521. a limiting hole; 522. a snap ring; 53. a baffle ring; 54. a compression spring; 6. a locking sleeve; 61. a first portion; 62. a second portion; 63. a convex ring; 64. a limiting cavity; 65. a limiting block; 66. a drive ring; 7. a second drive assembly; 71. a stepping motor; 72. a synchronous belt; 73. a first synchronizing wheel; 74. a second synchronizing wheel; 75. a support plate; 8. a feeding turntable; 81. a placing groove; 82. an induction column; 9. a monitoring component; 91. a distance sensor; 92. a correlation sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An automatic nozzle replacing device 2 as shown in fig. 1 to 12 comprises a frame 1, a replacing device 2 and a feeding device 3, wherein the feeding device 3 can be used for placing a plurality of nozzles and sending the nozzles to a replacing station, and the replacing device 2 is arranged on the frame 1 and driven to the replacing station through the frame 1 to replace the nozzles; the replacing device 2 comprises a first driving component 4, a connecting piece 5 and a locking sleeve 6, wherein the connecting piece 5 is hung at the bottom of the rack 1 and used for connecting a nozzle, the locking sleeve 6 is sleeved on the outer ring of the connecting piece 5 and can move along the length direction of the connecting piece, and the first driving component 4 can drive the locking sleeve 6 to move and match with the connecting piece 5 to lock and fix or unlock and separate the nozzle; loading attachment 3 includes second drive assembly 7, material loading revolving stage 8 and monitoring subassembly 9, has seted up a plurality of settling grooves 81 on material loading revolving stage 8 and has been used for placing the nozzle, and second drive assembly 7 drive material loading revolving stage 8 rotates, and monitoring subassembly 9 is arranged in detecting settling groove 81 and has or not nozzle.

In the specific implementation process, the locking sleeve 6 is always sleeved on the outer ring of the connecting piece 5 under the action of the first driving component 4, the locking sleeve 6 is driven to move up and down by the first driving component 4, and at the moment, the locking sleeve 6 moves up and down relative to the connecting piece 5, so that the locking and fixing or unlocking and separation of a nozzle inserted into one end, far away from the rack 1, of the connecting piece 5 are realized; set up a plurality of new nozzles on material loading revolving stage 8, at first drive empty arrangement groove 81 to the change station under material loading revolving stage 8's rotation, drop to the arrangement groove 81 through first drive assembly 4 drive nozzle, rethread second drive assembly 7 drive material loading revolving stage 8 will place the arrangement groove 81 of new nozzle and move to the change station, it is fixed with new nozzle locking through first drive assembly 4, accomplish the change of nozzle.

Specifically, as shown in fig. 7 and 8, two ends of the connecting member 5 are disposed through, and include a connecting portion 51 and a fixing portion 52, the connecting portion 51 is fixedly connected to the frame 1, the locking sleeve 6 is disposed corresponding to the fixing portion 52, the fixing portion 52 is provided with a limiting hole 521, and one end of the fixing portion adjacent to the connecting portion 51 is provided with a retaining ring 53; the through hole of the locking sleeve 6 is provided with a first part 61 and a second part 62 along the axial direction thereof, a convex ring 63 is arranged between the first part 61 and the second part 62, the first part 61 is sleeved on the outer ring of the retaining ring 53, a compression spring 54 is sleeved on the outer ring of the fixing part 52, two ends of the compression spring 54 are respectively abutted against the retaining ring 53 and the convex ring 63, the second part 62 is sleeved on the outer ring of the fixing part 52 and forms a limiting cavity 64 by matching with the outer ring thereof, a limiting block 65 is arranged in the limiting cavity 64, and the locking sleeve 6 moves and drives the limiting block 65 to protrude or retract from the limiting hole 521.

As shown in fig. 10, in the application, the nozzle is fixedly connected with the replacing device 2 through the clamping seat on the nozzle, and is stably matched with the placing groove 81 on the feeding device 3, a ring groove is formed in the circumferential outer wall of one end of the clamping seat close to the replacing device 2, the limiting block 65 is clamped into the ring groove by the locking sleeve 6 after the limiting block 65 is ejected out of the limiting hole 521, the limiting block 65 is tightly pressed by the internal compression spring 54, and the replacing device 2 is locked with the nozzle.

Furthermore, a plurality of limiting holes 521 are arranged along the circumferential direction of the fixing part 52, a snap ring 522 is arranged at one end of each limiting hole far away from the locking sleeve, and the outline of each limiting block is larger than the inner ring of the snap ring 522 and smaller than the limiting hole 521; the limiting block 65 is arranged to be a spherical part corresponding to the limiting hole 521, and the diameter of the limiting block 65 is smaller than the diameter of the limiting hole 521 and larger than the inner diameter of the snap ring 522, as shown in fig. 9; one end of the second portion 62 close to the protruding ring 63 is set to a furled structure, and the inner diameter thereof is gradually reduced toward the protruding ring 63, and the limit block 65 is set close to the protruding ring 63.

The diameter of the limiting block 65 is larger than the inner diameter of the snap ring 522 but smaller than the diameter of the limiting hole 521, so that the limiting block 65 cannot pass through the limiting hole 521 and fall off after the nozzle is separated, and meanwhile, the part protruding out of the limiting hole 521 cannot exceed half of the self volume when the limiting block 65 locks the nozzle, so that the limiting block 65 can return; the setting of draw in structure is convenient for at the lock sleeve 6 removal in-process, with nozzle locking or unblock, and the spacing chamber 64 that the cooperation fixed part 52 formed keeps away from fixed part 52 at lock sleeve 6 and removes the in-process, and stopper 65 can break away from gradually in spacing hole 521 automatically, realizes breaking away from automatically of nozzle.

A drive ring 66 is arranged on the outer ring of the locking sleeve 6, and the first drive assembly 4 is fixedly connected with the drive ring 66 and drives the locking sleeve 6 to move through the drive ring 66. The first driving assembly 4 comprises a first cylinder 41, a pull rope 42 and a fixing block 43, the first cylinder 41 is arranged on the frame 1, the fixing block 43 is fixedly connected with the driving ring 66, and two ends of the pull rope 42 are respectively fixedly connected with an output shaft of the first cylinder 41 and the fixing block 43, so that the occupied space is small.

In the implementation process, when the pull rope 42 is not stressed, the locking sleeve 6 presses the limiting block 65 by the internal compression spring 54 to enable the limiting block to protrude out of the limiting hole 521 and clamp the annular groove on the nozzle, so that the nozzle is fixed; the first cylinder 41 pulls the pull rope 42, so that the pull rope 42 drives the fixing block 43 and drives the locking sleeve 6 to move upwards, and the locking sleeve 6 releases the limiting block 65 and releases the nozzle to enable the locking sleeve 6 to be separated.

As another preferred embodiment of the first driving assembly 4 of the present application, as shown in fig. 9, the first driving assembly 4 includes a second cylinder 44 and a mounting plate 45, the mounting plate 45 is disposed on the connecting portion 51 in parallel with the driving ring 66, the second cylinder 44 is fixed on the mounting plate 45 in the vertical direction, and an output shaft of the second cylinder 44 is disposed toward the driving ring 66 and fixedly connected thereto, and the occupied space is large.

In the implementation process, the second cylinder 44 extends out, and the locking sleeve 6 presses the limiting block 65 by virtue of the internal compression spring 54, so that the limiting block protrudes out of the limiting hole 521 and clamps the annular groove on the nozzle, so that the nozzle is fixed; when the second cylinder 44 retracts, the locking sleeve 6 is lifted, and the locking sleeve 6 releases the limiting block 65 and releases the nozzle to be separated.

As shown in fig. 2 and 3, the second driving assembly 7 is disposed on the supporting plate 75, and the second driving assembly 7 includes a stepping motor 71, a timing belt 72, a first synchronizing wheel 73, and a second synchronizing wheel 74; the first synchronizing wheel 73 coaxially rotates along with an output shaft of the stepping motor 71, the second synchronizing wheel 74 is coaxially arranged with the feeding turntable 8, and the synchronizing belt 72 is sleeved on outer rings of the first synchronizing wheel 73 and the second synchronizing wheel 74.

Specifically, the plurality of placing grooves 81 are formed in the edge of the feeding turntable 8 along the circumferential direction, a plurality of induction columns 82 are arranged corresponding to the plurality of placing grooves 81, and the induction columns 82 are arranged close to the placing grooves 81; the induction column 82 presses down and protrudes out of the bottom of the feeding rotary table 8, and the radial dimension of the induction column 82 on the feeding rotary table 8 is smaller than that of the placement groove 81.

In the use process, the monitoring assembly 9 is arranged on the supporting plate 75 and comprises a distance sensor 91 and an opposite-shooting sensor 92, the distance sensor 91 can detect the distance between the sensing column 82 and the opposite-shooting sensor 92 can detect whether a nozzle exists in the arranging groove 81 or not. Distance sensor 91 corresponds the setting of induction column 82, and is located material loading revolving stage 8 below, and correlation sensor 92 corresponds the setting of arrangement groove 81 and sets up at the change station, and is located material loading revolving stage 8 top. Specifically, the second driving assembly 7 drives the feeding rotary table 8 to move the empty placing groove 81 to the replacing station, the induction column 82 is pressed down when the old nozzle is placed in the placing groove 81, and the second driving assembly 7 drives the feeding rotary table 8 to move the placing groove 81 in which the new nozzle is placed to the replacing station.

At this time, the pressed sensing bar 82 is positioned above the distance sensor 91, and the distance sensor 91 detects the sensing bar 82, which indicates that the nozzle of the installation slot 81 is an old nozzle. When the old nozzle is replaced, the nozzle is not in the corresponding placement groove 81 by detecting the presence of the nozzle by the opposite-jet sensor 92, and the replacement device 2 is prevented from descending and colliding. When a new nozzle is manually placed in the placing groove 81, the sensing post 82 corresponding to the placing groove 81 needs to be pulled out. After the old nozzle is replaced, when a new nozzle is taken out, whether the nozzle exists in the corresponding placing groove 81 is detected through the correlation sensor 92, the new nozzle is locked and taken away by the replacing device 2, and emptying is prevented.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A nozzle exchange device, comprising: the nozzle replacing device comprises a rack (1), a replacing device (2) and a feeding device (3), wherein the feeding device (3) can be used for placing a plurality of nozzles and sending the nozzles to a replacing station, and the replacing device (2) is arranged on the rack (1) and is driven to the replacing station through the rack (1) to replace the nozzles;

the replacing device (2) comprises a first driving assembly (4), a connecting piece (5) and a locking sleeve (6), wherein the connecting piece (5) is hung at the bottom of the rack (1) and used for connecting a nozzle, the locking sleeve (6) is sleeved on the outer ring of the connecting piece (5) and can move along the length direction of the connecting piece, and the first driving assembly (4) can drive the locking sleeve (6) to move and is matched with the connecting piece (5) to lock and fix the nozzle or unlock and separate the nozzle;

loading attachment (3) include second drive assembly (7), material loading revolving stage (8) and monitoring subassembly (9) it is used for placing the nozzle to have seted up a plurality of resettlement grooves (81) on material loading revolving stage (8), second drive assembly (7) drive material loading revolving stage (8) rotate, monitoring subassembly (9) are used for detecting whether have the nozzle in resettlement groove (81).

2. The nozzle replacing device according to claim 1, wherein the connecting member (5) is provided with two ends penetrating and comprises a connecting portion (51) and a fixing portion (52), the connecting portion (51) is fixedly connected with the frame (1), the locking sleeve (6) is provided corresponding to the fixing portion (52), the fixing portion (52) is provided with a limiting hole (521), and one end of the fixing portion close to the connecting portion (51) is provided with a retaining ring (53);

the through hole of the locking sleeve (6) is provided with a first part (61) and a second part (62) along the axial direction of the through hole, a convex ring (63) is arranged between the first part (61) and the second part (62), the first part (61) is sleeved on the outer ring of the retaining ring (53), a compression spring (54) is sleeved on the outer ring of the fixing part (52), two ends of the compression spring (54) are respectively abutted to the retaining ring (53) and the convex ring (63), the second part (62) is sleeved on the outer ring of the fixing part (52) and matched with the outer wall of the fixing part to form a limiting cavity (64), a limiting block (65) is arranged in the limiting cavity (64), and the locking sleeve (6) moves and drives the limiting block (65) to protrude or retract from the limiting hole (521).

3. The nozzle replacing device according to claim 2, wherein a plurality of limiting holes (521) are formed in the circumferential direction of the fixing portion (52), a snap ring (522) is arranged at one end, away from the locking sleeve, of each limiting hole (521), and the outline of each limiting block (65) is larger than the inner ring of the snap ring (522) and smaller than the limiting holes (521);

the limiting block (65) is arranged to be a spherical piece corresponding to the limiting hole (521), the diameter of the limiting block (65) is smaller than that of the limiting hole (521) and larger than the inner diameter of the clamping ring (522), one end, close to the convex ring (63), of the second portion (62) is arranged to be a furled structure, the inner diameter of the second portion is gradually reduced towards the convex ring (63), and the limiting cavity (64) is arranged close to the convex ring (63).

4. Nozzle changing apparatus according to claim 2, wherein a drive ring (66) is provided at the outer ring of the locking sleeve (6), and the first drive assembly (4) is fixedly connected to the drive ring (66) and moves the locking sleeve (6) via the drive ring (66).

5. The nozzle changing apparatus according to claim 4, wherein the first driving assembly (4) comprises a first cylinder (41), a pull rope (42) and a fixing block (43), the first cylinder (41) is disposed on the frame (1), the fixing block (43) is fixedly connected with the driving ring (66), and both ends of the pull rope (42) are fixedly connected with an output shaft of the first cylinder (41) and the fixing block (43), respectively.

6. Nozzle changing device according to claim 4, characterized in that the first drive assembly (4) comprises a second cylinder (44) and a mounting plate (45), the mounting plate (45) being arranged on the connection (51) parallel to the drive ring (66), the second cylinder (44) being fixed on the mounting plate (45) in a vertical direction, and an output shaft of the second cylinder (44) being arranged towards the drive ring (66) and being fixedly connected thereto.

7. Nozzle changing apparatus according to claim 1, wherein the second drive assembly (7) is provided on a support plate (75), the second drive assembly (7) comprising a stepper motor (71), a timing belt (72), a first timing wheel (73) and a second timing wheel (74);

the first synchronizing wheel (73) rotates coaxially with an output shaft of the stepping motor (71), the second synchronizing wheel (74) and the feeding turntable (8) are arranged coaxially, and the outer rings of the first synchronizing wheel (73) and the second synchronizing wheel (74) are sleeved with the synchronous belt (72).

8. The nozzle replacing device according to claim 7, wherein a plurality of the placing grooves (81) are arranged at the edge of the feeding turntable (8) along the circumferential direction, a plurality of induction columns (82) are arranged corresponding to the placing grooves (81), and the induction columns (82) are arranged close to the placing grooves (81);

the induction column (82) is pressed downwards and protrudes out of the bottom of the feeding rotary table (8), and the radial size of the induction column (82) on the feeding rotary table (8) is smaller than that of the placement groove (81).

9. Nozzle changing device according to claim 8, wherein the monitoring assembly (9) is arranged on the support plate (75) and comprises a distance sensor (91) and a correlation sensor (92), the distance sensor (91) being able to detect the distance from the sensing post (82), the correlation sensor (92) being able to detect the presence or absence of a nozzle in the seating groove (81).

10. Nozzle changing device according to claim 9, wherein the distance sensor (91) is arranged in correspondence with the induction column (82) and below the loading turret (8), and the correlation sensor (92) is arranged in correspondence with the seating groove (81) at a changing station and above the loading turret (8).

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