CN214867609U

CN214867609U - Cutter floating structure for rotary cutting equipment

Info

Publication number: CN214867609U
Application number: CN202121078685.3U
Authority: CN
Inventors: 张宇
Original assignee: SHENZHEN NEW CANGHAI MACHINERY CO Ltd
Current assignee: SHENZHEN NEW CANGHAI MACHINERY CO Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-11-26
Anticipated expiration: 2031-05-19

Abstract

The application discloses a cutter floating structure for rotary-cut equipment includes: the sliding seat and a cutter mounting shaft arranged on the sliding seat; the sliding seat is provided with a cutter disc mounting part, and the cutter mounting shaft is pivoted to the cutter disc mounting part through a matched cutter bearing; the front end of the cutter mounting shaft is provided with a cutter fixing part which is used for fixing the cutter head; the cutter bearing can move in the axial direction of the cutter mounting shaft based on the sliding seat so as to enable the cutter disc fixed on the cutter mounting shaft to approach or be far away from the sliding seat; a floating elastic component is arranged between the cutter bearing and the sliding seat, and the floating elastic component forces the cutter mounting shaft to be at an initial position so that the disc surface of the cutter disc is close to the sliding seat.

Description

Cutter floating structure for rotary cutting equipment

Technical Field

The application relates to the field of machining, in particular to a cutter floating structure for rotary cutting equipment.

Background

The rotary cutting device comprises a rotary cutting base and a main shaft which is rotatably arranged on the rotary cutting base, a rotary cutting cutter disc is arranged at the front end of the main shaft, two groups or three groups of cutters are uniformly distributed on the circumference of the rotary cutting cutter disc, a belt groove is arranged on the periphery of the rotary cutting cutter disc, a cutter disc driving device drives the rotary cutting cutter disc to rotate based on the rotary cutting base through a belt, and in the rotating process of the rotary cutting cutter disc, a cutter feeding structure drives the cutters on the rotary cutting blades to feed so as to cut off the steel pipe which passes through the main shaft.

The cutter comprises a cutter disc and a cutter holder, wherein the cutter holder is movably connected with the rotary cutter disc and can slide in the radial direction of the rotary cutter disc based on the rotary cutter disc, and the cutter holder is driven to move to realize feeding based on the rotary cutter disc through a cutter feeding structure.

In the process of cutting the steel pipe by the cutter head, one side of the steel pipe on two sides of the cutting position is fixed, the position of the steel pipe on the fixed side cannot be changed, the steel pipe section on the fixed side continuously supports the cutter head along with the gradual cutting of the cutter head into the wall thickness of the steel pipe, and the cutter head is gradually accelerated along with the increase of the cutter point cutting amount, so that the cutter head is abnormally abraded, and the service life of the cutter head is shortened.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems existing in the prior art, the application provides a cutter floating structure for rotary cutting equipment, which can enable a cutter disc to be far away from a floating seat in the cutting process, reduce abnormal wear caused by the disc surface of the steel pipe end surface abutting against the cutter disc to the cutter disc, and prolong the service life of the cutter disc.

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

there is provided a cutter floating structure for a rotary cutting apparatus, comprising: the sliding seat and a cutter mounting shaft arranged on the sliding seat; the sliding seat is provided with a cutter disc mounting part, and the cutter mounting shaft is pivoted to the cutter disc mounting part through a matched cutter bearing; the front end of the cutter mounting shaft is provided with a cutter fixing part which is used for fixing the cutter head; the cutter bearing can move in the axial direction of the cutter mounting shaft based on the sliding seat so as to enable the cutter disc fixed on the cutter mounting shaft to approach or be far away from the sliding seat; a floating elastic component is arranged between the cutter bearing and the sliding seat, and the floating elastic component forces the cutter mounting shaft to be at an initial position so that the disc surface of the cutter disc is close to the sliding seat.

Preferably, the cutter bearing comprises a bearing outer ring and a bearing inner ring, and the bearing inner ring is sleeved and fixed on the cutter mounting shaft; the cutter head mounting part penetrates through the front surface and the back surface of the sliding seat, and the inner diameter of the bearing outer ring is matched with that of the cutter head mounting part; an annular gland is arranged on the front surface of the sliding seat, namely one side provided with the cutter head, an elastic containing part is arranged on one side of the gland facing the sliding seat, a floating spring is arranged in the elastic containing part and serves as a floating elastic part, and the floating spring is abutted against the outer ring of the bearing; the cutter head installation part is provided with an axial limiting part to limit the axial position of the cutter installation shaft.

Preferably, a bearing washer is provided between the floating spring and the bearing outer race.

Preferably, the back of slide is equipped with the limiting plate, and the limiting plate is equipped with spacing boss as the spacing portion of axial, limiting plate, and the installation axle of cutter is in the spacing boss butt of initial position in the bearing inner race.

Preferably, the rear end of the cutter mounting shaft is connected with a locking member, the cutter mounting shaft is provided with a shaft shoulder, and the locking member abuts against the bearing inner ring so as to fix the inner ring of the cutter bearing between the shaft shoulder and the locking member which are arranged on the cutter bearing.

Preferably, the cutter mounting shaft is provided at a front end thereof with a mounting shaft portion for fitting the cutter head and a locking shaft portion provided with a locking nut for fastening the cutter head to the mounting shaft portion by tightening the locking nut.

The technical scheme provided by the application can comprise the following beneficial effects: there is provided a cutter floating structure for a rotary cutting apparatus, comprising: the sliding seat and a cutter mounting shaft arranged on the sliding seat; the sliding seat is provided with a cutter disc mounting part, and the cutter mounting shaft is pivoted to the cutter disc mounting part through a matched cutter bearing; the front end of the cutter mounting shaft is provided with a cutter fixing part which is used for fixing the cutter head; the cutter bearing can move in the axial direction of the cutter mounting shaft based on the sliding seat so as to enable the cutter disc fixed on the cutter mounting shaft to approach or be far away from the sliding seat; a floating elastic component is arranged between the cutter bearing and the sliding seat, and the floating elastic component forces the cutter mounting shaft to be at an initial position so that the disc surface of the cutter disc is close to the sliding seat. The floating structure of the cutter can enable the cutter head to be far away from the floating seat in the cutting process, reduce abnormal abrasion caused by the cutter head when the end surface of the steel pipe is abutted to the cutter head, and prolong the service life of the cutter head.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

Fig. 1 is a schematic view of the overall structure shown in embodiment 1 of the present application.

Fig. 2 is a schematic sectional view of the entire structure shown in embodiment 1 of the present application.

Fig. 3 is a side schematic view of the entire structure shown in embodiment 1 of the present application after hiding the rack.

Fig. 4 is a schematic view 1 of a link installation shown in embodiment 1 of the present application.

Fig. 5 is a schematic view 2 of a link installation shown in embodiment 1 of the present application.

Fig. 6 is a schematic view 3 of a link installation shown in embodiment 1 of the present application.

Fig. 7 is a schematic view of the overall structure of the connecting rod shown in embodiment 1 of the present application.

Fig. 8 is a front partially cut-away schematic view of a cutter assembly shown in embodiment 1 of the present application.

Fig. 9 is a schematic front view of a cutter member shown in embodiment 1 of the present application.

Fig. 10 is a schematic sectional view at C-C in fig. 8, which is shown in embodiment 1 of the present application.

Fig. 11 is a schematic view of the overall structure of the fixing base shown in embodiment 1 of the present application.

Fig. 12 is a schematic view of the entire structure of the sliding seat shown in embodiment 1 of the present application.

Fig. 13 is a schematic view of the entire structure of the adjustment seat shown in embodiment 1 of the present application.

Fig. 14 is a longitudinal sectional view of the cutter assembly shown in embodiment 1 of the present application.

Fig. 15 is a partial part assembly schematic view of a cutter member shown in embodiment 1 of the present application.

Description of the reference numerals

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.

Example 1

Referring to fig. 1 to 7, a steel tube rotary cutting apparatus includes a frame 101 and a rotary cutting device disposed on a working table of the frame 101, the rotary cutting device includes a rotary cutting base 102 and a main shaft 103 rotatably disposed on the rotary cutting base 102, a rotary cutter disc 104 is mounted at a front end of the main shaft 103, three sets of cutters are uniformly disposed on a circumference of the rotary cutter disc 104, a belt groove 105 is disposed on a periphery of the rotary cutter disc 104, a cutter disc 106 driving device drives the rotary cutter disc 104 to rotate based on the rotary cutting base 102 through a belt, and a cutter feeding structure drives the cutters on the rotary cutter blades to feed to cut a steel tube passing through the main shaft 103 during rotation of the rotary cutter disc 104.

Wherein a cutter feeding structure for rotary cutting equipment comprises: a slide shaft 201, a slide seat 301 and a driving mechanism; the slide base 301 is mounted on the rotary cutting base 102, the slide shaft 201 is disposed on the slide base 301, and the slide shaft 201 can move in the axial direction of the slide base 301 under the driving of the driving mechanism; the front end of the sliding shaft 201 is rotatably connected with a hook claw mounting plate 401, the hook claw mounting plate 401 is provided with a transmission mechanism, the power input side of the transmission mechanism is connected with the hook claw mounting plate 401, and the power output side of the transmission mechanism is connected with a cutter; a synchronous mechanism is arranged between the hook claw mounting plate 401 and the rotary cutter disc 104, so that the hook claw mounting plate 401 can synchronously rotate with the rotary cutter disc 104 while approaching or departing from the rotary cutter disc 104; when the driving mechanism drives the sliding shaft 201 to move in the axial direction of the sliding base 301, the transmission mechanism can drive the cutter to move based on the turntable.

Wherein, the sliding shaft 201 is in a hollow column shape; one side of the sliding seat 301 connected with the sliding shaft 201 is provided with a sleeve joint part 302, the outer diameter of the sliding shaft 201 is matched with the sleeve joint part 302, and the sliding shaft 201 is inserted into the sleeve joint part 302; the outer periphery of the slide base 301 is provided with a driving groove 303 communicating with the socket 302, and the driving mechanism is connected to the slide shaft 201 through the driving groove 303.

Specifically, the driving mechanism comprises a hinge rod and a power device, one end of the hinge rod is rotatably connected with a preset position of the rotary cutting equipment, the other end of the hinge rod is connected with an output end of the power device, and the power device can drive the hinge rod to swing based on the preset position of the rotary cutting equipment; the hinge rod is provided with a shifting shaft 510 at a preset position, and the shifting shaft 510 penetrates through the driving groove 303 to be connected with the sliding shaft 201.

The power device comprises a motor 505, a lead screw 506, a lead screw mounting seat 507 and a nut 508, the lead screw mounting seat 507 is rotatably connected with the power device bracket 503, the power device bracket 503 is configured on the rotary cutting base 102, and the nut 508 is rotatably connected with the free end of the hinge rod, so that the hinge rod is driven to swing based on the preset position of the rotary cutting equipment by the nut 508 in the process that the lead screw 506 rotates to drive the nut 508 to move.

More specifically, the hinge rod includes a first hinge rod 501 and a second hinge rod 502, the first hinge rod 501 and the second hinge rod 502 are connected by a cross rod 504, a screw rod connecting hinge seat 509 is arranged on the cross rod 504, and a nut 508 is rotatably connected with the screw rod connecting hinge seat 509.

The front end of the sliding shaft 201 is provided with a bearing installation part 202, the hook claw installation plate 401 comprises a hook claw disc body 402 and a hook claw disc rotating shaft 403, the hook claw disc rotating shaft 403 is arranged on one side of the hook claw disc body 402, the hook claw disc rotating shaft 403 is provided with a first through hole penetrating through the hook claw installation plate 401, the hook claw disc rotating shaft 403 is pivoted to the bearing installation part 202 through a matching bearing, and the first through hole is used for avoiding the main shaft 103 of the rotary cutting equipment.

Wherein, the tool apron includes adjusting seat 109 and sliding seat 110, the rotary cutter head 104 has fixed seats 108, the sliding seat 110 is disposed in the fixed seats 108 in a sliding manner, the cutter head 106 is pivoted to the sliding seat 110; the adjusting seat 109 is connected to the sliding seat 110 in a position-adjustable manner, the adjusting seat 109 is provided with a driven slider 409, the driven slider 409 can move in the axial direction of the sliding shaft 201 based on the adjusting seat 109, and the connecting rod 408 is pivoted to the driven slider 409; the reverse side of the hook claw mounting plate 401, which is provided with the hook claw disc rotating shaft 403, is provided with a driving slider 406 which is in sliding connection with the hook claw mounting plate 401, specifically, the hook claw mounting plate 401 is provided with a hook claw sliding seat 404, the hook claw sliding seat 404 is provided with a hook claw sliding groove 405, and the driving slider 406 is arranged in the hook claw sliding groove 405 in a sliding manner; the transmission mechanism comprises a connecting rod 408, a rod body of the connecting rod 408 is rotatably connected to the rotary cutter disc 104, one end of the connecting rod 408 is rotatably connected to the cutter holder, and the other end of the connecting rod 408 is rotatably connected to the driving slider 406.

Specifically, the connecting rod 408 is L-shaped, a first connecting rod pivoting portion 410 is disposed at a corner of the connecting rod 408, and the first connecting rod pivoting portion 410 is rotatably connected to the rotary cutter head 104 through a matching rotating shaft, specifically, a connecting rod hinge base 113 is disposed at the back of the fixing base 108, and the first connecting rod pivoting portion 410 is pivotally connected to the connecting rod hinge base 113 through a matching rotating shaft, so that the connecting rod is indirectly pivotally connected to the rotary cutter head 104; the two ends of the connecting rod 408 are respectively provided with a connecting rod second pivoting part 411 and a connecting rod third pivoting part 412, the connecting rod second pivoting part 411 is pivoted on the driven slide block 409 through a matching rotating shaft, and the third pivoting part is pivoted on the connecting rod driving slide block 406; one end of the link 408 having the second pivot portion 411 serves as a power output side of the transmission mechanism, and one end of the link 408 having the third pivot portion 412 serves as a power input side of the transmission mechanism.

In order to realize the synchronous rotation of the hook mounting plate 401 and the rotary cutter head 104, the synchronizing mechanism includes a guide rod 111 and a sliding sleeve 112, one end of the guide rod 111 is connected with the hook mounting plate 401, and the other end of the guide rod 111 is inserted into the sliding sleeve 112 disposed on the rotary cutter head 104.

In the above steel tube rotary cutting apparatus, due to factors such as assembly error or tolerance of the outer diameter dimension of the cutter head, if not adjusted, different cutter heads may contact the workpiece to be cut off in sequence during the feeding process, and therefore an independent adjusting mechanism needs to be designed so that the position of the cutter head can be finely adjusted based on the cutter holder to eliminate the above-mentioned influence.

Referring to fig. 8 to 13, a cutter adjusting structure for rotary cutting apparatus includes: a fixed seat 108, a sliding seat 110 and an adjusting seat 109; the fixed seat 108 is provided with a first sliding groove 1081, the sliding seat 110 is arranged in the first sliding groove 1081, and the sliding seat 110 is provided with a cutter head mounting part 1104 for mounting a cutter head; the sliding seat 110 is provided with a second chute 1101, the adjusting seat 109 is arranged in the second chute 1101, and the adjusting seat 109 is provided with a feeding connecting part 1091 for connecting a feeding structure; the upper end face of the adjusting seat 109 is provided with a first adjusting threaded hole 1092, the upper side wall of the second chute 1101 is provided with a first adjusting hole 1105 corresponding to the adjusting threaded hole, the first adjusting hole 1105 is communicated with the upper end face of the sliding seat, and the upper end face of the sliding seat is provided with a first adjusting screw 601 which passes through the first adjusting hole 1105 and is connected with the first adjusting threaded hole 1092; the upper end surface of the sliding seat 110 is provided with a second adjusting threaded hole 1106 adjacent to the first adjusting hole 1105, the second adjusting threaded hole 1106 penetrates through the upper sidewall of the second sliding chute 1101, a second adjusting screw 602 is disposed in the second adjusting threaded hole 1106, and the second adjusting screw 602 is screwed into the second adjusting threaded hole 1106 and abuts against the upper end surface of the adjusting seat 109.

In order to enable the pretightening force between the adjusting seat 109 and the sliding seat 110 in the process that the first adjusting screw 601 drives the adjusting seat 109 to be away from the second adjusting screw 602 in the adjusting process, a pretightening elastic component is arranged between the upper end surface of the adjusting seat 109 and the sliding seat 110. A pre-tightening spring 605 is configured as a pre-tightening elastic component, and the pre-tightening spring 605 is sleeved on the second adjusting screw 602. Specifically, the second adjustment screw 602 includes a second screw thread portion 603 and a second screw spring portion 604, the diameter of the second screw spring portion 604 is smaller than that of the second screw thread portion 603, the pre-tightening spring 605 is sleeved on the second screw spring portion 604, and the outer diameter of the pre-tightening spring 605 is smaller than the inner diameter of the second adjustment screw hole 1106.

Further, the cross section of the first sliding groove 1081 is T-shaped, and the first sliding groove 1081 includes a first bottom plate 1082, a first side plate 1083 and a first cover plate 1084. In order to adjust the sliding gap between the sliding seat 110 and the first sliding groove 1081, one of the first side plates 1083 has a plurality of gap adjusting threaded holes 1085 along the extending direction of the first sliding groove 1081, and a gap adjusting block 606 is disposed between the first side plate 1083 having the gap adjusting threaded holes 1085 and the sliding seat 110.

The cross-sectional shape of the sliding seat is matched with that of the first sliding groove 1081, one side of the sliding seat, which is in contact with the first bottom plate 1082, is a bottom surface of the sliding seat, one side opposite to the bottom surface of the sliding seat is a top surface of the sliding seat, the second sliding groove 1101 comprises a second through groove 1102 and a second sinking groove 1103, the second through groove 1102 is consistent with the extending direction of the first sliding groove 1081 and is communicated with the top surface of the adjusting seat 109 and the top surface of the adjusting seat 109, and the second sinking groove 1103 is arranged on the bottom surface of the adjusting seat 109.

The first bottom plate 1082 is provided with a first avoiding groove 1086, the first avoiding groove 1086 penetrates through the first bottom plate 1082, and the width of the first avoiding groove 1086 is smaller than the width of the adjusting base 109.

The adjusting base 109 is provided with an adjusting body anti-falling platform 1093 matched with the second sinking groove 1103, and a feeding chute is arranged on the side of the adjusting base 109 contacting the first bottom plate 1082 as a feeding connecting part 1091.

In order to obtain the adjusted value during debugging, the adjusting seat is provided with an indicator 1094, and the sliding seat 110 is provided with a scale 1107 corresponding to the indicator 1094.

In order to realize that the cutter disc floats in the axial of cutter installation axle, this application still provides a cutter floating structure for rotary-cut equipment.

Referring to fig. 14 and 15, a cutter floating structure for rotary cutting apparatus includes: a sliding seat and a cutter mounting shaft 701 arranged on the sliding seat; the sliding seat is provided with a cutter head mounting part, and a cutter mounting shaft 701 is pivoted to the cutter head mounting part through a matching cutter bearing 702; a cutter fixing part is arranged at the front end of the cutter mounting shaft 701 and used for fixing a cutter head; the cutter bearing 702 can move in the axial direction of the cutter mounting shaft 701 based on the sliding seat, so that the disc surface of the cutter disc fixed on the cutter mounting shaft 701 approaches to or departs from the sliding seat; a floating elastic component is arranged between the cutter bearing 702 and the sliding seat, and the floating elastic component forces the cutter mounting shaft 701 to be at an initial position so that the disk surface of the cutter disk is close to the sliding seat.

In this embodiment, the cutter bearing 702 includes a bearing outer ring 703 and a bearing inner ring 704, and the bearing inner ring 704 is fixed to the cutter mounting shaft 701 in a sleeved manner; the cutter head mounting part penetrates through the front surface and the back surface of the sliding seat, and the bearing outer ring 703 is matched with the inner diameter of the cutter head mounting part; an annular gland 705 is arranged on the front surface of the sliding seat, namely one side provided with the cutter disc, an elastic holding part 706 is arranged on one side of the gland 705 facing the sliding seat, a floating spring 707 is arranged in the elastic holding part 706, the floating spring 707 serves as a floating elastic component, and the floating spring 707 abuts against a bearing outer ring 703; the cutter head mounting portion is provided with an axial limiting portion to limit the axial position of the cutter mounting shaft 701.

Specifically, a bearing washer is arranged between the floating spring 707 and the bearing outer ring 703, a limiting plate 708 is arranged on the back surface of the slide seat, the limiting plate 708 serves as an axial limiting portion, and the limiting plate 708 is provided with a limiting boss 709, wherein when the cutter mounting shaft 701 is at the initial position, the limiting boss 709 abuts against the bearing outer ring 703.

A locking member 710 is attached to the rear end of the cutter mounting shaft 701 and the locking member 710 abuts the bearing inner race 704 to secure the inner race of the cutter bearing 702 between the shoulder 711 and the locking member 710.

The cutter attachment shaft 701 has an attachment shaft portion 712 and a lock shaft portion 713 at the tip end thereof, the attachment shaft portion 712 is configured to fit the cutter head, the lock shaft portion 713 is provided with a lock nut 714, and the cutter head is fixed to the attachment shaft portion 712 by tightening the lock nut 714.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the spirit of the disclosure.

Claims

1. A cutter floating structure for rotary cutting apparatus, comprising: the sliding seat and a cutter mounting shaft arranged on the sliding seat;

the sliding seat is provided with a cutter disc mounting part, and the cutter mounting shaft is pivoted to the cutter disc mounting part through a matched cutter bearing;

the front end of the cutter mounting shaft is provided with a cutter fixing part which is used for fixing the cutter head;

the cutter bearing can move in the axial direction of the cutter mounting shaft based on the sliding seat so as to enable the cutter disc fixed on the cutter mounting shaft to approach or be far away from the sliding seat;

a floating elastic component is arranged between the cutter bearing and the sliding seat, and the floating elastic component forces the cutter mounting shaft to be at an initial position so that the disc surface of the cutter disc is close to the sliding seat.

2. The cutter floating structure for rotary cutting equipment according to claim 1, wherein the cutter bearing comprises a bearing outer race and a bearing inner race, the bearing inner race being fixedly fitted to the cutter mounting shaft;

the cutter head mounting part penetrates through the front surface and the back surface of the sliding seat, and the inner diameter of the bearing outer ring is matched with that of the cutter head mounting part;

an annular gland is arranged on the front surface of the sliding seat, namely one side provided with the cutter head, an elastic containing part is arranged on one side of the gland facing the sliding seat, a floating spring is arranged in the elastic containing part and serves as a floating elastic part, and the floating spring is abutted against the outer ring of the bearing;

the cutter head installation part is provided with an axial limiting part to limit the axial position of the cutter installation shaft.

3. The cutter floating structure for rotational atherectomy devices of claim 2, wherein a bearing washer is disposed between the floating spring and the bearing outer race.

4. The cutter floating structure for rotary cutting equipment according to claim 2, wherein the slide base has a limiting plate on a back surface thereof, the limiting plate serving as an axial limiting portion, the limiting plate having a limiting boss abutting against the outer race of the bearing when the cutter mounting shaft is at the initial position.

5. The cutter floating structure for rotary cutting apparatus according to claim 2, wherein a locking member is coupled to a rear end of the cutter mounting shaft, the cutter mounting shaft is provided with a shoulder, and the locking member abuts against the inner race of the bearing to fix the inner race of the cutter bearing between the shoulder provided to the cutter bearing and the locking member.

6. The cutter floating structure for rotary cutting apparatus according to claim 2, wherein a front end of the cutter mounting shaft is provided with a mounting shaft portion for housing the cutter head and a locking shaft portion provided with a locking nut for fastening the cutter head to the mounting shaft portion by tightening the locking nut.