CN111872724A - Cutter unfolding power head - Google Patents

Abstract

The invention provides a cutter unfolding power head, and belongs to the technical field of machinery. The problems that a spindle of an existing cutter expanding power head is prone to abrasion and high in maintenance cost are solved. This exhibition sword unit head of improvement structure, including the main shaft, wear to be equipped with the clearance between pull rod and the main shaft in the main shaft, its characterized in that, the main shaft rear side is provided with the core cover and the core cover that radially link firmly with the main shaft can be dismantled with the main shaft and be connected, the core cover is established outside the pull rod and the core cover outside is equipped with the radial spacing subassembly of core cover, the internal diameter of core cover slightly is greater than the pull rod external diameter that supplies core cover department of establishing and the internal diameter of core cover is less than the internal diameter of main shaft. The main shaft of the cutter expanding power head with the improved structure is not easy to wear and has low maintenance cost.

Description

Cutter unfolding power head

Technical Field

The invention belongs to the technical field of machinery, and relates to a machining part, in particular to a power head.

Background

The power head is a power component which can realize main movement and feed movement and has automatic workpiece circulation. The novel variable-speed transmission mechanism is a simple variable-speed transmission mechanism, has various forms, has the basic principle that a motor drives a gear variable-speed mechanism, can realize functions of boring, milling, drilling and the like, and can do linear motion in a small range due to the fact that some of the variable-speed transmission mechanism is provided with a guide rail. The power head mainly realizes different processing through main shaft rotation and feeding. And if the workpiece machining process is complex (turning inclined pull grooves, turning taper surfaces, turning threads and the like), the machining process can be realized only by a specific servo cutter expanding power head.

For example, in the patent with application No. 201520726505.6, a cutter expanding power head is disclosed, which comprises a main shaft unit, a feeding unit, and a processing unit, wherein the main shaft unit has a main shaft, the feeding unit has a feeding motor, the feeding motor is connected to the main shaft of the main shaft unit through a first ball screw, the processing unit has a processing motor, a pull rod and an expanding cutter head, the processing motor is connected to one end of the pull rod through a second ball screw, the other end of the pull rod is connected to the expanding cutter head, and the expanding cutter head is connected to the main shaft of the main shaft unit.

This kind of exhibition sword unit head is continuing exhibition tool bit at the main shaft front end, wear to be equipped with the clearance between pull rod and main shaft and the pull rod in the main shaft, the main shaft is usually realized driving exhibition tool bit rotation through rotating electrical machines and the hold-in range pulley subassembly that set up on the motor box, and hold-in range etc. in the hold-in range pulley subassembly need the tensioning, hold-in range pulley subassembly can produce a pulling force to the main shaft at this in-process, and the exhibition tool bit is being connected to the main shaft front end and is keeping the location, consequently this pulling force inevitable can make the main shaft rear end cause the skew or crooked phenomenon, make contact and then produce contact wear between main shaft rear. The main shaft is a core part, and the abrasion of the main shaft further causes the error of the matching relation with other parts to influence the working precision. And the main shaft has high precision requirement, so the manufacturing cost is high, once the main shaft is worn and damaged, the main shaft can only be replaced, and the main shaft is inconvenient to maintain and has high cost.

In order to prevent the abrasion or damage of the main shaft, one of the conventionally conceivable solutions is to solve from the result that, in the case where the tilting phenomenon inevitably occurs, the abrasion is prevented from occurring when the main shaft is in contact with the drawbar by using the main shaft made of a wear-resistant material and increasing the hardness of the main shaft. Or an easily-conceived mode is to solve the problem from the source, that is, directly support the end part of the rear end of the main shaft, so as to prevent the rear end of the main shaft from tilting after the main shaft is pulled by the synchronous pulley transmission assembly in the middle, that is, to prevent the tilting problem from occurring and further avoid the occurrence of wear, as shown in the patent with the application number of 201910204362.5.

Disclosure of Invention

The invention aims to provide a cutter expanding power head aiming at the problems in the prior art, and aims to solve the problems that a main shaft of the existing cutter expanding power head is easy to wear and high in maintenance cost.

The utility model provides an exhibition sword unit head, includes the main shaft, wear to be equipped with the clearance between pull rod and the main shaft in the main shaft, its characterized in that, the main shaft rear side is provided with the core cover and the core cover that link firmly with the main shaft is radial can dismantle with the main shaft and be connected, the core cover is established outside the pull rod and the core cover outside is equipped with the radial spacing subassembly of core cover, the internal diameter of core cover slightly is greater than the pull rod external diameter that supplies core cover department of establishing and the internal diameter of core cover is less than the internal diameter of main shaft.

The front end of a main shaft of the cutter unfolding power head is connected with the cutter unfolding, the core sleeve is radially limited by the limiting component, so that the radial position of the core sleeve can be basically unchanged, and the radial positioning of the core sleeve and the rear side of the main shaft is equivalent to that the limiting component can also radially limit the rear end of the main shaft to a certain degree, so that the rear end of the main shaft is prevented from being eccentric or inclined to a certain degree due to the fact that the main shaft is tensioned by a synchronous transmission mechanism on a motor box, the phenomenon that the main shaft is inconsistent with the concentricity of the pull rod, and further the main shaft and the pull rod are in frictional contact or are abraded is avoided, the main shaft is prevented from being. The inner diameter of the core sleeve is slightly larger than the outer diameter of the pull rod at the position where the core sleeve is sleeved and is combined with the limit of the limit component, so that a gap is formed between the core sleeve and the pull rod, the core sleeve and the pull rod can be always coaxially arranged, and the core sleeve and the pull rod can normally generate relative motion without friction. In addition, even in the extreme condition that errors exist in all matching and the like, the spindle is inevitably deviated to a certain degree, the spindle and the core sleeve are positioned in the radial direction, the inner diameter of the core sleeve is set to be smaller than that of the spindle, namely, the core sleeve is in contact with the pull rod preferentially because the distance between the core sleeve and the pull rod is smaller, the spindle is prevented from being directly abraded, the precision of the spindle is further influenced, the core sleeve is detachably connected with the spindle, the core sleeve can be conveniently replaced when the core sleeve is abraded, the spindle is not influenced, the core sleeve does not need to be matched with other complex parts such as cutters and the like, the precision requirement is low relatively, the production and manufacturing cost is low, and the maintenance cost is low.

Conventionally, the core sleeve fixedly connected with the main shaft is arranged on the rear side of the main shaft, and the core sleeve is matched with the supporting component to realize the supporting function. Since it is the spindle that is ultimately supported, it is conventionally understood in the art that direct support of the spindle is simplest to prevent skewed wear of the spindle, the more parts there are more costly and costly to maintain, the more unstable the fit is and the more susceptible the error base is, the less accurate the fit is and the more the wear is.

In foretell exhibition sword unit head, the core cover has the convex location arch to the front side in the one end that links to each other with the main shaft, the location arch stretches into in the main shaft and sets up with the laminating of main shaft internal surface mutually. The positioning protrusion is attached to the inner surface of the main shaft in an abutting mode, so that the positioning protrusion and the inner surface of the main shaft can be positioned in a radial direction, the radial fixed connection relation between the main shaft and the core sleeve is more reliable, the main shaft is not prone to being skewed, abrasion is avoided, and maintenance cost is further reduced.

In the above cutter unfolding power head, the positioning protrusions are annular or the number of the positioning protrusions is at least two and is uniformly distributed along the circumferential direction of the core sleeve. Annular location arch can all laminate with the main shaft internal surface in whole surface, and this laminating area is big and just can't produce radial upward relative movement between main shaft and the core cover when making normally assemble into, guarantees all the time that radial stable location between the two makes the radial relation of linking firmly between main shaft and the core cover more reliable, guarantees that the main shaft is difficult for skewing and then difficult production wearing and tearing all the time, further reduces cost of maintenance. In addition, the positioning bulges are uniformly distributed along the circumferential direction of the core sleeve, so that the effect can be achieved.

In foretell exhibition sword unit head, exhibition sword unit head is still including establishing the pressure cap that the cover was established outside the core cover, press the cap to be the annular and have the spacing turn-ups of turning over inwards, convex spacing arch has on the outer peripheral face of core cover, press cap and main shaft threaded connection and spacing arch by the centre gripping between pressure cap and main shaft terminal surface. The connection between the main shaft and the core sleeve can be conveniently realized through the compression of the pressing cap, and meanwhile, when the core sleeve is damaged, only the core sleeve needs to be replaced without replacing the pressing cap, threads and the like do not need to be machined on the core sleeve, and therefore the cost can be further reduced. The main shaft is high in machining precision, so that the precision of the end face is high, the end face of the main shaft can play a role of a positioning face simultaneously in the process that the limiting protrusion is clamped tightly, the core sleeve is assisted in installation and positioning, the matching precision between the core sleeve and the main shaft is high, the radial fixed connection relation between the main shaft and the core sleeve is more reliable, and the main shaft is guaranteed not to be prone to skew all the time and not prone to abrasion.

In the above cutter unfolding power head, the limiting flange has a limiting surface attached to the limiting protrusion, an annular yielding groove is formed in the inner surface of the pressing cap, and a groove wall on one side of the yielding groove is connected with the limiting surface and is located on the same plane. The setting of the groove of stepping down for spacing face can be hugged closely to the core cover in the in-process of installation, avoids because the dimensional deviation that machining precision scheduling problem caused and then leads to the condition that can't paste, and this design has improved the assembly efficiency between core cover and the pressure cap, reduces the time cost of dismouting. Meanwhile, the core sleeve is stably and accurately positioned on the pressing cap, so that the connection relation between the pressing cap and the core sleeve is more reliable, the main shaft is not prone to being skewed all the time, abrasion is not prone to being generated, and maintenance cost is further reduced.

In the above cutter expanding power head, the limiting flange has an annular inner peripheral surface, and the inner peripheral surface of the limiting flange is attached to the outer peripheral surface of the core sleeve. This setting can make and carry out dual radial spacing to the core cover, increases the core cover and presses the laminating area between the cap and just make the core cover just can't produce radial upward relative movement with pressing the cap when normally assembling into, guarantees the radial stable location between the two throughout, and then makes the radial positioning of main shaft more reliable, guarantees that the main shaft is difficult for skewing and then difficult production wearing and tearing all the time, further reduces cost of maintenance.

In foretell exhibition sword unit head, spacing subassembly includes that the cover establishes bearing frame one outside the core cover and sets up bearing one between bearing frame one and core cover, exhibition sword unit head still includes the motor box that links firmly with the main shaft axial and the exhibition sword support that links firmly with the motor box, exhibition sword support links firmly the slide rail that parallels with the main shaft in, slide block one has been linked firmly on the slide rail, slide block one links firmly with bearing frame one mutually. The exhibition sword support links firmly with the motor box, and the slide rail, slider one is connected again on the exhibition sword support, and the bearing frame links firmly with slider one, therefore the radial position of bearing frame one is by these a little slider one, the slide rail, exhibition sword support etc. are confirmed, and these a little slider and slide rail isotructure can also realize the support to the axial motion process of bearing frame one, even do not influence when spacing subassembly produces the ascending motion of axial and support spacing stationarity yet, guarantee that the main shaft can be reliably difficult for producing wearing and tearing all the time in radial positioning. In addition, the bearing I can ensure that the circumferential rotation of the core sleeve or even the main shaft is not influenced even if the bearing seat I is circumferentially fixed, and the main shaft is prevented from being damaged or being incapable of being normally used due to the interference, clamping stagnation and the like.

In foretell exhibition sword unit head, exhibition sword unit head still includes the lead screw that links firmly with the pull rod axial, be provided with the rotating electrical machines on the exhibition sword support and overlap the screw-nut who establishes outside the lead screw, the rotating electrical machines can drive screw-nut synchronous rotation and drive the lead screw and slide along the axial is reciprocal. According to the invention, the rotary motor can drive the lead screw nut to rotate in the circumferential direction, the lead screw nut and the rotary motor can realize circumferential synchronous motion through a conventional synchronous pulley component, the lead screw nut is sleeved outside the lead screw and can convert the rotary motion into axial motion of the lead screw, and finally the pull rod is driven to reciprocate in the axial direction. The screw rod and the screw rod nut are conventional screw rod nut assemblies which are commercially available and are not described in detail herein.

In foretell exhibition sword unit head, still be provided with the bearing frame two that links firmly mutually with the lead screw in the exhibition sword support, the rear end threaded connection of pull rod has the pull rod adapter sleeve, the pull rod adapter sleeve wears to establish in bearing frame two and links to each other through bearing two between pull rod adapter sleeve and the bearing frame two. The second bearing seat can realize radial support of the pull rod, radial limiting of the pull rod is guaranteed, and then the end part of the pull rod is prevented from being deviated, so that the end part of the pull rod is inconsistent in coaxiality with the main shaft and is prevented from contacting the main shaft. The circumferential limiting of the second bearing seat can not affect the circumferential rotation of the connecting sleeve of the pull rod through the second bearing. In addition, the second bearing seat is not directly connected between the pull rods through the second bearing, but a pull rod connecting sleeve is arranged at the end part of each pull rod, the pull rod connecting sleeves can facilitate assembly between the pull rods and the second bearing seats, contact abrasion and the like between the pull rods and the bearings directly and the like are avoided, the pull rod connecting sleeves can be directly replaced when the pull rods are damaged, the pull rods do not need to be replaced, and maintenance cost is reduced.

In the above cutter unfolding power head, the core sleeve is provided with an annular positioning bulge protruding towards the front side, and the core sleeve is in threaded connection with the main shaft through the positioning bulge. Besides being connected through the pressure cap, the core sleeve and the main shaft can be directly connected with each other through the threads arranged on the core sleeve and the main shaft in a screwed mode, two quick connections can be achieved, and the core sleeve and the main shaft can be conveniently replaced when damaged and maintained.

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

1. carry out radial spacing of certain degree through spacing subassembly to core cover and the main shaft that links firmly with the core cover, the certain degree is avoided the main shaft to lead to the rear end off-centre or crooked owing to receive synchronous drive mechanism's on the motor box tensioning force, avoids inconsistent and then lead to appearing frictional contact or wearing and tearing between main shaft and the pull rod with the concentricity of pull rod, prevents that the main shaft from damaging.

2. Even if the main shaft is inevitably deflected to a certain degree, the inner diameter of the core sleeve is set to be smaller than that of the main shaft, namely, the distance between the core sleeve and the pull rod is smaller, so that the core sleeve can also preferentially contact the pull rod, and the main shaft is prevented from being directly abraded to further influence the precision of the main shaft.

3. The core sleeve is detachably connected with the main shaft, so that the core sleeve can be conveniently replaced when the core sleeve is worn without affecting the main shaft, the core sleeve does not need to be matched with complex parts such as other cutters and the like, and relatively speaking, the production and manufacturing cost is low and the maintenance cost is low.

Drawings

Fig. 1 is a schematic perspective view of a power head of a scalpel in an embodiment.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is an enlarged view of a portion D of fig. 3.

Fig. 5 is a schematic perspective view of a core sleeve according to an embodiment.

Fig. 6 is a schematic perspective view of a medium pressure cap according to an embodiment.

FIG. 7 is a schematic view of a connection structure of the core barrel, the spindle and the press cap according to an embodiment.

Fig. 8 is an enlarged view of a portion B of fig. 2.

Fig. 9 is an enlarged view of a portion C of fig. 2.

In the figure, 1, main shaft; 2. a pull rod; 3. a core sleeve; 31. positioning the projection; 32. a limiting bulge; 4. a limiting component; 41. a first bearing seat; 42. a first bearing; 43. locking the nut; 5. pressing the cap; 51. limiting and flanging; 511. a limiting surface; 52. a yielding groove; 6. a motor box; 7. a knife unfolding bracket; 81. a slide rail; 82. a first sliding block; 83. a screw rod; 84. a rotating electric machine; 85. a feed screw nut; 86. a second bearing seat; 87. a second bearing; 88. a pull rod connecting sleeve; 91. a feed drive source; 92. a rotary drive source.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1 and 2, a cutter expanding power head includes a main shaft 1, a cutter expanding head (not shown in the figure) is connected to a front end of the main shaft 1, the cutter expanding power head further includes a rotary drive source 92 for driving the main shaft 1 to rotate and a feed drive source 91 for driving the main shaft 1 to feed along an axial direction, the cutter expanding head can be driven to move correspondingly by the rotary motion and the linear motion of the main shaft 1, and the rotary drive source 92 and the feed drive source 91 in this embodiment can both adopt common drive sources such as motors.

As shown in fig. 1 and 3, the cutter unfolding power head further comprises a motor box 6 axially fixedly connected with the spindle 1 and a cutter unfolding support 7 fixedly connected with the motor box 6, a sliding rail 81 parallel to the spindle 1 is fixedly connected in the cutter unfolding support 7, and a first sliding block 82 is fixedly connected on the sliding rail 81. In addition, the scalpel head in the embodiment can also perform complex motions such as thread turning, and the function is mainly realized by the pull rod 2 connected with the scalpel.

Specifically, this embodiment is worn to be equipped with pull rod 2 and has the clearance between pull rod 2 and the main shaft 1 in main shaft 1, and main shaft 1 rear side is provided with the core cover 3 of radially linking firmly with main shaft 1. The core sleeve 3 is sleeved outside the pull rod 2, a limiting component 4 for radially limiting the core sleeve 3 is arranged on the outer side of the core sleeve 3, specifically, the limiting component 4 comprises a bearing seat I41 sleeved outside the core sleeve 3 and a bearing I42 arranged between the bearing seat I41 and the core sleeve 3, and the bearing I42 is axially limited on the core sleeve 3 through a locking nut 43 matched with a stepped groove on the outer surface of the core sleeve 3. The first bearing seat 41 is fixedly connected with the first sliding block 82. The unfolding knife bracket 7 is fixedly connected with the motor box 6, the sliding rail 81 and the sliding block 82 are connected to the unfolding knife bracket 7, and the bearing seat 41 is fixedly connected with the sliding block 82, so that the radial position of the bearing seat 41 is determined by the sliding blocks 82, the sliding rail 81, the unfolding knife bracket 7 and the like, and the sliding blocks 82, the sliding rail 81 and other structures can also support the bearing seat 41 along the axial movement process, so that the supporting and limiting stability is not influenced even if the limiting component 4 moves axially, and the main shaft 1 can be reliably positioned in the radial direction all the time and is not easy to wear.

In addition, the first bearing 42 can ensure that the circumferential rotation of the core sleeve 3 and even the main shaft 1 is not influenced even if the first bearing seat 41 is circumferentially fixed, and the main shaft 1 is prevented from being damaged or being incapable of being normally used due to the phenomena of interference, clamping stagnation and the like. Carry out radial spacing messenger core cover 3 through spacing subassembly 4 to core cover 3 and can keep radial position unchangeable basically, and because the rear side radial positioning of core cover 3 and main shaft 1 is equivalent to spacing subassembly 4 promptly and also can carry out the radial spacing of certain degree to the rear end of main shaft 1, so certain degree avoids main shaft 1 to lead to the rear end to be eccentric or crooked owing to receive synchronous drive mechanism's on the motor box 6 straining force, avoid with pull rod 2 the concentricity inconsistent and then lead to appearing frictional contact or wearing and tearing between main shaft 1 and the pull rod 2. The inner diameter of the core sleeve 3 is slightly larger than the outer diameter of the pull rod 2 at the position where the core sleeve 3 is sleeved, so that a gap is formed between the core sleeve 3 and the pull rod 2, and the inner diameter of the core sleeve 3 is smaller than the inner diameter of the spindle 1, namely, the distance between the core sleeve 3 and the pull rod 2 is smaller, so that the core sleeve 3 can also preferentially contact with the pull rod 2, and the spindle 1 is prevented from being directly abraded, and the precision of the spindle 1 is further influenced. Of course, the gap between the core housing 3 and the pull rod 2 can be made smaller in a proper range, as long as the relative movement between the two is not affected.

As shown in fig. 3 to 5, the core housing 3 has a positioning protrusion 31 protruding toward the front side at one end connected to the spindle 1, and the positioning protrusion 31 extends into the spindle 1 and is attached to the inner surface of the spindle 1. The positioning protrusion 31 is abutted against the inner surface of the main shaft 1, so that the positioning protrusion and the main shaft can be positioned in a certain radial direction. The protruding 31 of location is the annular in this embodiment, and annular location is protruding 31 can all be laminated with 1 internal surface of main shaft on the whole surface, and this laminating area is big and just can't produce radial upward relative movement between main shaft 1 and the core cover 3 when making normally assemble into, guarantees the radial stable location between the two all the time.

The core sleeve 3 is detachably connected with the main shaft 1, so that the core sleeve 3 can be conveniently replaced when the core sleeve 3 is worn without affecting the main shaft 1. Specifically, the pressing cap 5 is sleeved outside the core sleeve 3, the pressing cap 5 is annular and is provided with a limiting flanging 51 which is turned inwards, a convex limiting bulge 32 is arranged on the outer peripheral surface of the core sleeve 3, the pressing cap 5 is in threaded connection with the spindle 1, and the limiting bulge 32 is clamped between the pressing cap 5 and the end surface of the spindle 1. The connection between the main shaft 1 and the core sleeve 3 can be conveniently realized through the compression of the pressing cap 5, and meanwhile, when the core sleeve 3 is damaged, only the core sleeve 3 needs to be replaced without replacing the pressing cap 5, threads and the like do not need to be machined on the core sleeve 3, and therefore the cost can be further reduced. As shown in fig. 4, 6 and 7, the limiting flange 51 has a limiting surface 511 that is attached to the limiting protrusion 32, an annular receding groove 52 is formed on the inner surface of the pressing cap 5, and a groove wall of one side of the receding groove 52 is connected to the limiting surface 511 and is located on the same plane.

In addition, the limiting flange 51 has an annular inner peripheral surface, and the inner peripheral surface of the limiting flange 51 is attached to the outer peripheral surface of the core sleeve 3. This setting can make can carry out dual radial spacing to core sleeve 3, increases core sleeve 3 and presses the laminating area between cap 5 and make core sleeve 3 with press cap 5 when normally assembling into even whole and between just can't produce radial upward relative movement.

As shown in fig. 8, a second bearing seat 86 fixedly connected with the screw 83 is further arranged in the spreader bar support 7, a pull rod connecting sleeve 88 is connected to the rear end of the pull rod 2 through a thread, the pull rod connecting sleeve 88 is arranged in the second bearing seat 86 in a penetrating manner, and the pull rod connecting sleeve 88 is connected with the second bearing seat 86 through the second bearing 87. The second bearing seat 86 can realize radial support of the pull rod 2, ensure radial limitation of the pull rod 2, and further prevent the end part of the pull rod 2 from deviating and contacting with the spindle 1 due to inconsistent coaxiality. The second bearing 87 ensures that the circumferential limit of the second bearing seat 86 does not influence the circumferential rotation of the pull rod connecting sleeve 88.

Further, as shown in fig. 9, the cutter expanding power head further includes a screw rod 83 axially and fixedly connected to the pull rod 2, a rotary motor 84 and a screw rod nut 85 sleeved outside the screw rod 83 are arranged on the cutter expanding bracket 7, and the rotary motor 84 can drive the screw rod nut 85 to synchronously rotate and drive the screw rod 83 to slide back and forth along the axial direction. The circumferential synchronous motion between the rotary motor 84 and the feed screw nut 85 can be achieved by a conventional synchronous pulley assembly. The lead screw 83 and the lead screw nut 85 are conventional lead screw nut 85 components, which are commercially available and are not described herein.

Example two:

the structure and principle of this embodiment are basically the same as those of the first embodiment, and different points are as follows: in this embodiment, the pressing cap 5 is not used to connect the spindle 1 and the core housing 3, but an annular positioning protrusion 31 protruding toward the front side is provided on the core housing 3, and the core housing 3 is in threaded connection with the spindle 1 through the positioning protrusion 31. The core sleeve 3 is directly provided with threads to be in threaded connection with the main shaft 1, two quick connections can be realized, and the core sleeve can be conveniently replaced and maintained when damaged.

Example three:

the structure and principle of this embodiment are basically the same as those of the first embodiment, and different points are as follows: the limiting component 4 comprises a sliding barrel sleeved outside the core sleeve 3, a second sliding block is further arranged on the outer peripheral face of the core sleeve 3, a sliding groove which is axially arranged along the main shaft 1 and can be used for embedding the second sliding block is formed in the sliding barrel, the cutter unfolding power head further comprises a motor box 6 fixedly connected with the main shaft 1 in the axial direction and a cutter unfolding support 7 fixedly connected with the motor box 6, and the cutter unfolding support 7 is in a cylindrical shape and is connected with the sliding barrel through a bearing in a three-phase mode. Radial spacing to core housing 3 can also be realized through above-mentioned mode, realize the support to core housing 3 well, do not hinder rotation and the circumferential movement of core housing 3 simultaneously.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the main shaft 1, the pull rod 2, the core sleeve 3, the positioning protrusion 31, the limiting protrusion 32, the limiting component 4, the first bearing seat 41, the first bearing 42, the pressing cap 5, the limiting flange 51, the limiting surface 511, the abdicating groove 52, the motor box 6, the spreader bracket 7, the sliding rail 81, the first slider 82, the lead screw 83, the rotating motor 84, the lead screw nut (85)85, the second bearing seat 86, the second bearing 87, the pull rod connecting sleeve 88, the feeding driving source 91, the rotating driving source 92, and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. The utility model provides an exhibition sword unit head, includes main shaft (1), wear to be equipped with pull rod (2) and main shaft (1) in main shaft (1) and have the clearance between, its characterized in that, main shaft (1) rear side is provided with core cover (3) and main shaft (1) that radially link firmly with main shaft (1) and can dismantle with main shaft (1) and be connected, core cover (3) cover is established outside pull rod (2) and core cover (3) outside and is equipped with the radial spacing subassembly (4) of core cover (3), the internal diameter of core cover (3) slightly is greater than the internal diameter that supplies pull rod (2) external diameter and core cover (3) that core cover (3) cover was located to be less than main shaft (1).

2. The power head for the scalpel according to claim 1, wherein the core sleeve (3) has a positioning protrusion (31) protruding towards the front side at one end connected with the main shaft (1), and the positioning protrusion (31) extends into the main shaft (1) and is attached to the inner surface of the main shaft (1).

3. The power head for the cutter expanding according to claim 2, characterized in that the positioning protrusions (31) are annular or the number of the positioning protrusions (31) is at least two and is evenly distributed along the circumferential direction of the core sleeve (3).

4. The cutter expanding power head according to any one of claims 1 to 3, further comprising a pressing cap (5) sleeved outside the core sleeve (3), wherein the pressing cap (5) is annular and has a limiting flange (51) turned inwards, a convex limiting protrusion (32) is arranged on the outer peripheral surface of the core sleeve (3), the pressing cap (5) is in threaded connection with the spindle (1), and the limiting protrusion (32) is clamped between the pressing cap (5) and the end surface of the spindle (1).

5. The power head for the spreading knife according to claim 4, wherein the limiting flange (51) is provided with a limiting surface (511) which is attached to the limiting protrusion (32), an annular yielding groove (52) is formed in the inner surface of the pressing cap (5), and a groove wall on one side of the yielding groove (52) is connected with the limiting surface (511) and is located on the same plane.

6. The power head for the scalpel spreading tool according to claim 4, wherein the limiting flange (51) is provided with an annular inner circumferential surface, and the inner circumferential surface of the limiting flange (51) is attached to the outer circumferential surface of the core sleeve (3).

7. The cutter expanding power head according to any one of claims 1 to 3, wherein the limiting component (4) comprises a first bearing seat (41) sleeved outside the core sleeve (3) and a first bearing (42) arranged between the first bearing seat (41) and the core sleeve (3), the cutter expanding power head further comprises a motor box (6) fixedly connected with the spindle (1) in the axial direction and a cutter expanding bracket (7) fixedly connected with the motor box (6), a sliding rail (81) parallel to the spindle (1) is fixedly connected in the cutter expanding bracket (7), a first sliding block (82) is fixedly connected on the sliding rail (81), and the first sliding block (82) is fixedly connected with the first bearing seat (41).

8. The cutter expanding power head according to claim 7, further comprising a screw rod (83) axially fixedly connected with the pull rod (2), wherein the cutter expanding bracket (7) is provided with a rotating motor (84) and a screw rod nut (85) sleeved outside the screw rod (83), and the rotating motor (84) can drive the screw rod nut (85) to synchronously rotate and drive the screw rod (83) to slide in an axial reciprocating manner.

9. The cutter expanding power head according to claim 8, wherein a second bearing seat (86) fixedly connected with the screw rod (83) is further arranged in the cutter expanding support (7), a pull rod connecting sleeve (88) is connected to the rear end of the pull rod (2) in a threaded manner, the pull rod connecting sleeve (88) is arranged in the second bearing seat (86) in a penetrating manner, and the pull rod connecting sleeve (88) is connected with the second bearing seat (86) through a second bearing (87).

10. The power head for the cutter expanding according to claim 1, characterized in that the core sleeve (3) is provided with an annular positioning bulge (31) which protrudes towards the front side, and the core sleeve (3) is in threaded connection with the main shaft (1) through the positioning bulge (31).

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