阅读说明：本技术 外冷转内冷刀柄及外冷转内冷刀柄组件 (Outer cold interior cold handle of a knife and outer cold interior cold handle of a knife subassembly that changes of outer cold ) 是由 颜炳姜 李伟秋 于 2019-09-10 设计创作，主要内容包括：本发明涉及一种外冷转内冷刀柄及外冷转内冷刀柄组件,外冷转内冷刀柄包括刀柄本体、定位环、轴承座、轴承、定位柱、弹性件及换刀块,当需要将装配或取下刀柄本体,机械手抓取刀柄本体,使刀柄本体伸入或脱出主轴,向下或向下作用定位柱,第一卡位部与第二卡位部松开或卡合,实现刀柄本体自由转动或被限位。通过内冷刀具的方式实现内冷润滑,而且通过定位环上的第一卡位部与定位柱上的第二卡位部实现定位,达到快速更换刀柄的目的,避免人工调节喷嘴的位置或喷射角度,提高效率以降低人工成本,且保证产品质量稳定性。(The invention relates to an external-cooling-to-internal-cooling tool handle and an external-cooling-to-internal-cooling tool handle assembly. The mode through interior cold cutter realizes interior cold lubrication, realizes the location through first screens portion on the holding ring and the second screens portion on the reference column moreover, reaches the purpose of quick replacement handle of a knife, avoids the position or the spray angle of artifical regulation nozzle, raises the efficiency in order to reduce the cost of labor, and guarantees product quality stability.)

1. The utility model provides an outer cold-turning inner cooling handle of a knife which characterized in that includes:

the tool holder comprises a tool holder body, wherein a communication hole and a clamping hole are formed in the tool holder body, the communication hole is communicated with the clamping hole, and a positioning boss is arranged on the outer side wall of the tool holder body;

the positioning ring is sleeved on the outer side of the cutter handle body, an avoiding notch is formed in the positioning ring, and a first clamping part is arranged on the positioning ring;

the bearing seat is sleeved outside the tool holder body, a bearing is embedded on the bearing seat, the positioning ring is positioned between the positioning boss and the bearing seat and between the positioning boss and the bearing, the bearing seat is further provided with a medium channel and an annular groove which are mutually communicated, the annular groove is communicated with the communication hole, the bearing seat is further provided with a positioning hole, and the positioning hole is communicated with the medium channel;

the positioning column, the elastic part and the cutter changing block, wherein one end of the positioning column extends into the positioning hole, two ends of the elastic part are respectively abutted against the bottom of the positioning column and the bottom of the positioning hole, a first channel is formed in the positioning column and communicated with the medium channel, a second clamping part is arranged on the outer side wall of the positioning column and used for being matched with the first clamping part, a second channel is formed in the cutter changing block, the other end of the positioning column extends into the cutter changing block, and the second channel is communicated with the first channel.

2. The external-cooling internal-cooling knife handle according to claim 1, wherein the first clamping portion is a first clamping groove formed in the positioning ring, the bearing seat is provided with a second clamping groove corresponding to the first clamping groove, the second clamping portion is a clamping projection protruding out of the positioning column, and the clamping projection can be clamped into the first clamping groove and/or the second clamping groove.

3. The external-cooling internal-cooling tool handle according to claim 2, wherein the clamping projection comprises a connecting part and a clamping part, and the clamping part is connected to the outer side wall of the positioning column through the connecting part.

4. The external-cooling internal-cooling tool handle according to claim 3, wherein the clamping projection further comprises a first abutting portion, the bearing seat is further provided with a second abutting portion for abutting against the first abutting portion, and the second abutting portion is located on two sides of the second clamping groove.

5. The external cooling-to-internal cooling tool handle according to any one of claims 1 to 4, wherein a sealing structure is arranged between the bearing and the annular groove and/or the communication hole, the sealing structure is a sealing ring, and the sealing ring is sleeved outside the tool handle body and is positioned between the bearing and the annular groove or the communication hole.

6. The external cooling-to-internal cooling tool handle according to any one of claims 1 to 4, wherein a sealing structure is arranged between the bearing and the annular groove and/or the communication hole, the sealing structure is a labyrinth groove, a gap exists between the inner wall of the bearing seat and the outer wall of the tool handle body, the labyrinth groove is communicated with the gap, and the labyrinth groove is positioned between the bearing and the annular groove and/or the communication hole.

7. The external-cooling inner-cooling tool shank according to claim 6, wherein the labyrinth groove is formed in the inner wall of the bearing seat and is located between the bearing and the annular groove; or

The labyrinth groove is formed in the outer wall of the cutter handle and is positioned between the bearing and the communication hole; or

The labyrinth groove comprises a first groove and a second groove, the first groove is formed in the inner wall of the bearing seat, the second groove is formed in the outer wall of the tool holder body, the first groove and the second groove are communicated with the gap, the first groove is located between the bearing and the annular groove, and the second groove is located between the bearing and the communicating hole.

8. The external cooling-to-internal cooling tool handle according to any one of claims 1 to 4, wherein the positioning ring is further provided with a plurality of threaded holes, the plurality of threaded holes are circumferentially distributed at intervals, and a threaded fastener is arranged in the threaded holes in a penetrating manner so as to fix the positioning ring on the tool handle body.

9. The external cooling-to-internal cooling tool handle according to any one of claims 1 to 4, further comprising a quick-connection plug, wherein the quick-connection plug is arranged on the tool changing block, a third channel is formed in the quick-connection plug, and the third channel is communicated with the second channel.

10. The utility model provides an outer cold interior cold knife handle subassembly that changes, its characterized in that includes:

the external cold-turning internal cold tool shank of any one of claims 1 to 9; and

the tool head is assembled in the clamping hole, an internal cooling hole is formed in the tool head, and the internal cooling hole is communicated with the clamping hole.

Technical Field

The invention relates to the technical field of cutting machining, in particular to an external-cooling-to-internal-cooling cutter handle and an external-cooling-to-internal-cooling cutter handle.

Background

At present, the existing micro-lubricating system generally adopts an external nozzle to spray oil mist for lubrication in the machining of a machine tool, and the angle and the distance between a single nozzle or a plurality of nozzles and a workpiece and a cutter are manually adjusted by an operator so as to achieve the required lubricating and cooling effect. However, the lubrication method using the external nozzle is only suitable for conventional milling, shallow depth drilling and the like, and for some deep hole machining or deep groove milling, the lubrication method is difficult to lubricate the tool tip, so that the service life of the tool is greatly reduced, and the machining quality of the workpiece is greatly influenced.

In addition, a part generally has multiple processes in the machining process, frequent tool changing is needed, the situation that the tool mounting length of each tool is different and even the length of each tool shank is different often occurs, in order to enable the lubrication in the machining process to achieve a good effect, the machine needs to be stopped every time one tool is replaced, and the position or the spraying angle of a nozzle is manually adjusted. The result that leads to like this is, inefficiency, and the cost of labor increases, and the manual regulation is difficult to guarantee the uniformity in addition, has the uncertainty to make the cooling effect of every probably different, just also can't guarantee product quality's stability.

Disclosure of Invention

Therefore, it is necessary to provide an external-cooling-to-internal-cooling tool holder and an external-cooling-to-internal-cooling tool holder assembly, which can improve the efficiency, reduce the labor cost and ensure the stability of the product quality, in order to solve the above technical problems.

An external cold-turning internal cold tool shank comprising:

the tool holder comprises a tool holder body, wherein a communication hole and a clamping hole are formed in the tool holder body, the communication hole is communicated with the clamping hole, and a positioning boss is arranged on the outer side wall of the tool holder body;

the positioning ring is sleeved on the outer side of the cutter handle body, an avoiding notch is formed in the positioning ring, and a first clamping part is arranged on the positioning ring;

the bearing seat is sleeved outside the tool holder body, a bearing is embedded on the bearing seat, the positioning ring is positioned between the positioning boss and the bearing seat and between the positioning boss and the bearing, the bearing seat is further provided with a medium channel and an annular groove which are mutually communicated, the annular groove is communicated with the communication hole, the bearing seat is further provided with a positioning hole, and the positioning hole is communicated with the medium channel;

the positioning column, the elastic part and the cutter changing block, wherein one end of the positioning column extends into the positioning hole, two ends of the elastic part are respectively abutted against the bottom of the positioning column and the bottom of the positioning hole, a first channel is formed in the positioning column and communicated with the medium channel, a second clamping part is arranged on the outer side wall of the positioning column and used for being matched with the first clamping part, a second channel is formed in the cutter changing block, the other end of the positioning column extends into the cutter changing block, and the second channel is communicated with the first channel.

In one embodiment, the first positioning portion is a first positioning groove formed in the positioning ring, the bearing seat is provided with a second positioning groove corresponding to the first positioning groove, the second positioning portion is a positioning protrusion protruding out of the positioning column, and the positioning protrusion can be inserted into the first positioning groove and/or the second positioning groove.

In one embodiment, the positioning protrusion includes a connecting portion and a positioning portion, and the positioning portion is connected to an outer sidewall of the positioning column through the connecting portion.

In one embodiment, the clamping projection further includes a first abutting portion, the bearing seat is further provided with a second abutting portion for abutting against the first abutting portion, and the second abutting portion is located on two sides of the second clamping groove.

In one embodiment, a sealing structure is arranged between the bearing and the annular groove and/or the communication hole, the sealing structure is a sealing ring, and the sealing ring is sleeved outside the cutter handle body and is positioned between the bearing and the annular groove or the communication hole.

In one embodiment, a sealing structure is arranged between the bearing and the annular groove and/or the communication hole, the sealing structure is a labyrinth groove, a gap exists between the inner wall of the bearing seat and the outer wall of the tool holder body, the labyrinth groove is communicated with the gap, and the labyrinth groove is positioned between the bearing and the annular groove and/or the communication hole.

In one embodiment, the labyrinth groove is opened on the inner wall of the bearing seat and is positioned between the bearing and the annular groove; or

The labyrinth groove is formed in the outer wall of the cutter handle and is positioned between the bearing and the communication hole; or

The labyrinth groove comprises a first groove and a second groove, the first groove is formed in the inner wall of the bearing seat, the second groove is formed in the outer wall of the tool holder body, the first groove and the second groove are communicated with the gap, the first groove is located between the bearing and the annular groove, and the second groove is located between the bearing and the communicating hole.

In one embodiment, the positioning ring is further provided with a plurality of threaded holes which are distributed at intervals along the circumferential direction, and threaded fasteners are arranged in the threaded holes in a penetrating mode to fix the positioning ring on the tool handle body.

In one embodiment, the quick-connection tool changer further comprises a quick-connection plug, the quick-connection plug is arranged on the tool changing block, a third channel is formed in the quick-connection plug, and the third channel is communicated with the second channel.

An external cold-to-internal cold shank assembly comprising:

the external cold-turning internal cold tool shank as described in any one of the above; and

the tool head is assembled in the clamping hole, an internal cooling hole is formed in the tool head, and the internal cooling hole is communicated with the clamping hole.

The external-cooling, internal-cooling and external-cooling knife handle at least has the following advantages:

the positioning ring is sleeved outside the knife handle body and positioned below the positioning boss, and the positioning ring is not fixed with the knife handle body at the moment. Then the bearing is mounted on the bearing seat, and the positioning ring is positioned between the positioning boss and the bearing seat and between the positioning boss and the bearing. Arrange the elastic component in the locating hole, the rotational positioning ring makes the second screens portion of dodging breach and reference column correspond, dodges the breach this moment and steps down for second screens portion, then stretches into the locating hole with the one end of reference column in, pushes down the reference column afterwards, reference column compression elastic component, then the rotational positioning ring makes the second screens portion of dodging breach and reference column stagger, the reference column is pushed down by the holding ring, can accomplish the installation of reference column. Fix the tool changing block on the main shaft or on the auxiliary support, after the position of tool changing block was confirmed, stretch into the tool changing block with the other end of reference column and be fixed in the tool changing block, then rotatory holding ring guarantees that first screens portion and second screens portion looks block can confirm the position of holding ring, then locks the holding ring on handle of a knife body, fixes the position of holding ring well.

When the tool holder body needs to be assembled on the main shaft, the tool holder main body is grabbed by means of an external mechanical arm, one end, provided with the blind rivet, of the tool holder main body extends into the main shaft, the clamping jaw on the main shaft clamps the blind rivet, the blind rivet is upwards pulled through the pull rod, the positioning column is pressed downwards, the first clamping portion and the second clamping portion are loosened, and the tool holder body can freely rotate. When the handle of a knife body needs to be taken off, the handle of a knife main part is grabbed with the help of an external manipulator, the blind rivet is loosened by the clamping jaw on the main shaft, the manipulator pulls the handle of a knife main part downwards, one end of the handle of a knife main part is separated from the main shaft, one end of the positioning column is separated from the knife changing block, the positioning column is bounced through the elastic part, the first clamping part is clamped with the second clamping part, the relative position of the handle of a knife body and the bearing seat is limited, and the handle. Therefore, the mode through interior cold cutter realizes interior cold lubrication, realizes the location through first screens portion on the holding ring and the second screens portion on the reference column in addition, reaches the purpose of quick replacement handle of a knife, avoids the position or the spray angle of artifical regulation nozzle, raises the efficiency in order to reduce the cost of labor, and guarantees product quality stability.

Drawings

FIG. 1 is a schematic view of an embodiment of an external cold-to-internal cold tool shank assembly;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

fig. 4 is an enlarged view of a portion a in fig. 3.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

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 invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

Referring to fig. 1 to 3, an external-cooling-to-internal-cooling tool holder assembly 10 according to an embodiment includes an external-cooling-to-internal-cooling tool holder 100 and a tool head 200, the tool head 200 is clamped on the external-cooling-to-internal-cooling tool holder 100, and the tool head 200 is cooled and lubricated by an internal cooling method. The tool head 200 may be a tool, a grinding disc, or the like.

Specifically, the external cold-turning internal cold tool shank 100 includes a shank body 110, a positioning ring 170, a bearing seat 120, a bearing 130, a positioning column 140, an elastic member 150 and a tool changing block 160. The interior of the tool holder body 110 is provided with a communication hole 111 and a clamping hole 112, the communication hole 111 is communicated with the clamping hole 112, the tool head 200 is assembled in the clamping hole 112, the tool head 200 is further provided with an inner cooling hole 210, and the inner cooling hole 210 is communicated with the clamping hole 112. For example, an axially extending internal channel 113 is further formed in the tool holder body 110, and the communication hole 111 communicates with the clamping hole 112 through the internal channel 113.

The outer side wall of the tool holder body 110 is provided with a positioning boss 114. For example, in the present embodiment, the positioning boss 114 may be integrally formed and protruded on the outer sidewall of the tool holder body 110. Of course, in other embodiments, the positioning boss 114 may be provided separately from the tool shank body 110.

The positioning ring 170 is sleeved on the outer side of the tool holder body 110, an avoiding notch 171 is formed on the positioning ring 170, and a first clamping portion is arranged on the positioning ring 170. For example, the retaining ring 170 is a circular ring-shaped structure, and the relief notch 171 is formed by cutting a side of the retaining ring 170.

The bearing seat 120 is sleeved outside the tool holder body 110, the bearing 130 is embedded on the bearing seat 120, and the positioning ring 170 is located between the positioning boss 114 and the bearing seat 120 and the bearing 130. The bearing seat 120 is further provided with a medium channel 121 and an annular groove 122 which are communicated with each other, the annular groove 122 is communicated with the communicating hole 111, a sealing structure is arranged between the bearing 130 and the annular groove 122 and/or the communicating hole 111, the bearing seat 120 is further provided with a positioning hole 124, and the positioning hole 124 is communicated with the medium channel 121.

One end of the positioning post 140 extends into the positioning hole 124, two ends of the elastic member 150 respectively abut against the bottoms of the positioning post 140 and the positioning hole 124, a first channel 142 is formed on the positioning post 140, and the first channel 142 is communicated with the medium channel 121. The outer side wall of the positioning column 140 is provided with a second clamping portion, the second clamping portion is used for being matched with the first clamping portion, a second channel 161 is formed on the tool changing block 160, the other end of the positioning column 140 extends into the tool changing block 160, and the second channel 161 is communicated with the first channel 142.

The positioning ring 170 is sleeved outside the tool holder body 110 and located below the positioning boss 114, and at this time, the positioning ring 170 is not fixed to the tool holder body 110. The bearing 130 is then mounted to the bearing seat 120 with the retaining ring 170 positioned between the retaining boss 114 and the bearing seat 120 and bearing 130. The elastic part 150 is placed in the positioning hole 124, the positioning ring 170 is rotated to enable the avoiding notch 171 to correspond to the second clamping portion of the positioning column 140, the avoiding notch 171 is enabled to be abducted for the second clamping portion at the moment, then one end of the positioning column 140 extends into the positioning hole 124, the positioning column 140 is pressed downwards, the positioning column 140 compresses the elastic part 150, then the positioning ring 170 is rotated to enable the avoiding notch 171 to be staggered with the second clamping portion of the positioning column 140, the positioning column 140 is pressed by the positioning ring 170, and then the positioning column 140 can be installed. The tool changing block 160 is fixed on the main shaft or the auxiliary support, after the position of the tool changing block 160 is determined, the other end of the positioning column 140 extends into the tool changing block 160 and is fixed on the tool changing block 160, then the positioning ring 170 is rotated to ensure that the first clamping part and the second clamping part are clamped, and then the position of the positioning ring 170 can be determined, and then the positioning ring 170 is locked on the tool holder body 110 to fix the position of the positioning ring 170.

When the tool holder body 110 needs to be assembled on the spindle, the tool holder body 110 is grabbed by means of an external manipulator, one end, provided with the blind rivet, of the tool holder body 110 extends into the spindle, the blind rivet is clamped by the clamping jaw on the spindle, the blind rivet is pulled upwards through the pull rod, the positioning column 140 is pressed downwards, the first clamping portion and the second clamping portion are loosened, and the tool holder body 110 can rotate freely. When the tool holder body 110 needs to be taken down, the external mechanical arm is used for grabbing the tool holder main body 110, the clamping jaw on the main shaft loosens the blind rivet, the mechanical arm pulls the tool holder main body 110 downwards, one end of the tool holder main body 110 is separated from the main shaft, one end of the positioning column 140 is separated from the tool changing block 160, the positioning column 140 bounces through the elastic part 150, the first clamping part is clamped with the second clamping part, the relative position of the tool holder body 110 and the bearing seat 120 is limited, and the tool holder body 110 cannot rotate. Therefore, the inner cooling lubrication is realized in the mode of the inner cooling cutter, and the positioning is realized through the first clamping part on the positioning ring 170 and the second clamping part on the positioning column 140, so that the aim of quickly replacing the cutter handle is fulfilled, the position or the injection angle of the nozzle is prevented from being manually adjusted, the efficiency is improved, the labor cost is reduced, and the stability of the product quality is ensured.

Specifically, in the present embodiment, the first positioning portion is a first positioning groove 173 formed on the positioning ring 170, the bearing seat 120 is formed with a second positioning groove 125 corresponding to the first positioning groove 173, the second positioning portion is a positioning protrusion 144 formed protruding out of the positioning column 140, and the positioning protrusion 144 can be inserted into the first positioning groove 173 and/or the second positioning groove 125. When the locking protrusion 144 is locked in the first locking groove 173, the positioning column 140 is fixed to the handle body 110, and the handle cannot rotate freely. When the locking protrusion 144 is locked in the second locking groove 125, the positioning column 140 is fixed to the bearing seat 120, and the knife handle can rotate freely.

Further, the first locking groove 173 penetrates the bottom and the side of the positioning ring 170, and the second locking groove 125 penetrates the top and the side of the bearing seat 120, so as to lock the locking protrusion 144 into the first locking groove 173 or the second locking groove 125.

Furthermore, the locking protrusion 144 includes a connecting portion 145 and a locking portion 146, and the locking portion 146 is connected to the outer sidewall of the positioning column 140 through the connecting portion 145. When the locking protrusion 144 is locked with the first locking groove 173 or the second locking groove 125, the locking portion 146 extends into the first locking groove 173 or the second locking groove 125 to achieve the locking purpose.

Further, the locking protrusion 144 further includes a first abutting portion 147, the bearing seat 120 is further provided with a second abutting portion 126 for abutting against the first abutting portion 147, and the second abutting portion 126 is located at two sides of the second locking groove 125. Specifically, the number of the first abutting portions 147 is two, and the first abutting portions are located on two opposite sides of the positioning portion 146. For example, the cross-sectional shape formed by the first abutting portion 147 and the positioning portion 146 may be a "convex" shape. The second abutting portion 126 is a protruding abutting column with the bearing seat 120, and the height of the abutting column is higher than the top surface of the bearing seat 120. When the engaging portion 146 engages with the first engaging groove 173 or the second engaging groove 125, the first abutting portion 147 abuts against the second abutting portion 126, so as to increase the strength of the engaging portion 146 and prevent the engaging portion 146 from being twisted off under the action of torque.

Further, the sealing structure formed between the bearing 130 and the annular groove 122 and/or the communication hole 111 is a labyrinth groove 123, a gap exists between the inner wall of the bearing seat 120 and the outer wall of the tool holder body 110, the labyrinth groove 123 is communicated with the gap, and the labyrinth groove 123 is located between the bearing 130 and the annular groove 122 and/or the communication hole 111.

The cutting fluid or the oil-gas mixture enters the annular groove 122 through the medium channel 121 on the bearing seat 120, and a part of the cutting fluid or the oil-gas mixture leaks out through the gap in the early stage because the gap exists between the inner wall of the bearing seat 120 and the outer wall of the tool shank body 110. However, after the tool holder body 110 is driven to rotate at a high speed along with the high-speed rotation of the spindle, an oil film seal is formed at the gap, and the labyrinth grooves 123 buffer the air flow, so that the cutting fluid or the oil-gas mixture can be well sealed, and therefore the sealing performance between the bearing seat 120 and the tool holder body 110 can be ensured, so that the cutting fluid or the oil-gas mixture can only enter the tool holder body 110 through the communicating hole 111 and then enter the inner cooling hole 210 of the tool head 200 through the inner channel 113 and the clamping hole 112. In addition, because the non-contact labyrinth groove 123 sealing mode is adopted between the tool holder body 110 and the bearing seat 120, no friction exists between the tool holder body 110 and the bearing seat 120 during high-speed operation, and the tool holder body 110 freely rotates, so that the original 3000rpm of the tool holder body 110 can be increased to 18000rpm, and the rotating speed of the main shaft is increased on the premise of solving the problem of temperature rise of the tool holder body 110.

Specifically, referring to fig. 4, the labyrinth groove 123 is formed on the inner wall of the bearing seat 120 and is located between the bearing 130 and the annular groove 122. For example, the bearing housing 120 is formed with a receiving groove, and the bearing 130 is mounted in the receiving groove. Therefore, the bearing 130, the labyrinth groove 123, and the annular groove 122 are arranged at intervals in the axial direction.

Of course, in other embodiments, the labyrinth groove 123 may be formed on the outer wall of the holder body 110 and located between the bearing 130 and the communication hole 111, thereby reducing the difficulty of machining. Or, the labyrinth groove 123 includes a first groove provided on the inner wall of the bearing seat 120 and a second groove provided on the outer wall of the tool holder body 110, both the first groove and the second groove are communicated with the gap, the first groove is located between the bearing 130 and the annular groove 122, and the second groove is located between the bearing 130 and the communication hole 111.

Further, the number of the bearings 130 is two, two bearings 130 are embedded on the bearing seat 120, the two bearings 130 are respectively located at two opposite sides of the annular groove 122, and a labyrinth groove 123 is arranged between each bearing 130 and the annular groove 122 and/or the communication hole 111. Therefore, the two bearings 130 are provided, so that the rotation flexibility between the tool shank body 110 and the bearing seat 120 can be improved. Labyrinth grooves 123 are provided between the two bearings 130 and the annular groove 122 and/or the communication hole 111, and the sealing performance in the up-down direction can be ensured.

Further, the number of the labyrinth grooves 123 between each bearing 130 and the annular groove 122 and/or the communication hole 111 is two, and the two labyrinth grooves 123 are provided at intervals. The air flow can be further buffered, and the sealing performance is further improved.

Of course, in other embodiments, the sealing structure formed between the bearing 130 and the annular groove 122 and/or the communication hole 111 may also be a sealing ring, and the sealing ring is sleeved outside the tool holder body 110 and is located between the bearing 130 and the annular groove 122 or the communication hole 111. Realize sealed mode, simple structure through the sealing washer.

Further, the number of the communication holes 111 is at least two, and the communication holes 111 extend in the radial direction of the holder body 110. For example, in the embodiment shown in fig. 4, the number of the communication holes 111 is two, and the two communication holes 111 are arranged oppositely to increase the flow rate of the cooling medium and ensure the cooling and lubricating effects. Of course, in other embodiments, one, three, four, etc. communication holes 111 may be provided.

Further, one of the bearings 130 is located between the positioning ring 170 and the bearing seat 120. A pressing portion 148 may be formed on a side of the positioning ring 170 facing the bearing 130, and the pressing portion 148 presses against the bearing 130 to prevent the bearing 130 from moving axially relative to the bearing seat 120. The tool shank body 110 is further provided with a positioning member 115, and the other bearing 130 is located between the positioning member 115 and the bearing seat 120. For example, the positioning member 115 may be a snap spring. Firstly, the bearing 130 is installed on the bearing seat 120, then the bearing seat 120 is sleeved on the outer side of the tool holder body 110, then the clamp spring is clamped on the tool holder body 110, and the positioning boss 114 is matched with the clamp spring to limit the positioning ring 170, the bearing seat 120 and the bearing 130 to axially move.

Furthermore, a plurality of threaded holes 172 are further formed in the positioning ring 170, the plurality of threaded holes 172 are circumferentially distributed at intervals, and a threaded fastener penetrates through the threaded holes 172 to fix the positioning ring 170 to the tool holder body 110. The step of threading the threaded fastener into the threaded hole is performed after the position of the retaining ring 170 is determined. For example, the threaded fastener may be a screw.

Furthermore, a sleeve hole 149 is formed at one end of the positioning post 140 extending into the positioning hole 124, and one end of the elastic member 150 extends into the sleeve hole 149. For example, the elastic member 150 may be a spring, and one end of the spring extends into the sleeve hole 149, thereby improving the stability of the spring. The positioning post 140 further defines a side hole 104, and the side hole 104 is communicated with the first channel 142 and the medium channel 121. The diameter of the side hole 104 is larger than that of the medium passage 121, and thus the probability of the first passage 142 communicating with the medium passage 121 can be increased.

Further, a sealing ring is further disposed between one end of the positioning column 140 extending into the positioning hole 124 and the bearing seat 120, so as to improve the sealing performance between the positioning column 140 and the bearing seat 120. Similarly, a sealing ring is also arranged between one end of the positioning column 140 extending into the tool changing block 160 and the tool changing block 160, so as to improve the sealing performance between the positioning column 140 and the tool changing block 160.

Furthermore, the tool changing block 160 is provided with a mounting hole 163, and the mounting member is inserted into the mounting hole 163, so that the tool changing block 160 can be fixed on the main shaft or other auxiliary supports.

Further, the external cold-turning internal cold tool handle 100 further comprises a quick-connection plug 180, the quick-connection plug 180 is arranged on the tool changing block 160, a third channel 181 is formed in the quick-connection plug 180, and the third channel 181 is communicated with the second channel 161. Through quick connector 180, can realize being linked together fast with external cutting fluid storage device or oil-gas mixture storage device to improve the assembly convenience.

Referring to fig. 3, the external-cooling/internal-cooling tool holder assembly 10 further includes a collet 300, a lock nut 400 and a sealing member 500, wherein one end of the tool bit 200 is clamped in the collet 300, the collet 300 extends into the clamping hole 112, the sealing member 500 is disposed in the lock nut 400, and the lock nut 400 locks the collet 300 at one end of the tool holder body 110.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.