CN217019095U - Leading pneumatic chuck of large aperture square hole - Google Patents

Abstract

The utility model discloses a large-aperture square-hole front pneumatic chuck, which comprises a base, a chuck body and a rotary sealing assembly, wherein the center of the chuck body is provided with a square hole, and the chuck body and the rotary sealing assembly are respectively and coaxially arranged at the front end and the rear end of the base in a rotating manner; the chuck comprises a chuck body and is characterized in that a clamping assembly is arranged at the front end of the chuck body, a supporting assembly is fixedly arranged at the rear end of the chuck body, a synchronizing assembly located between a rotary driving assembly and the chuck body is sleeved on the supporting assembly, and the synchronizing assembly is connected with the clamping assembly and is suitable for driving the clamping assembly to synchronously move. According to the utility model, on the premise of not changing the overall outer diameter of the chuck, the size of the central hole of the square-hole chuck is further enlarged, the requirement of cutting a larger-size pipe can be met, and the use cost of pipe cutting is further reduced.

Description

Leading air chuck of large aperture square hole

Technical Field

The utility model relates to the technical field of chucks, in particular to a large-aperture square-hole front pneumatic chuck.

Background

The pneumatic chuck is used as an important accessory of laser cutting equipment and is used for clamping and conveying pipes and profiles made of various materials, so that the pipes and the profiles are machined. Conventional pneumatic chuck in market includes the base and rotates the chuck body and the rotary seal subassembly of locating the base front and back end, and the centre links to each other through rotating the cover, and chuck body front end is equipped with the centre gripping subassembly, rotates the synchronous subassembly that the cover overcoat was established and is linked to each other with the centre gripping subassembly to realize centre gripping subassembly synchronization action.

Tubular product cross sectional shape on the market is different to circular cross section tubular product is many, and square tubular product is inferior, receives traditional thinking to influence, and the chuck centre bore on the market, chuck body, rotation cover and rotary seal subassembly's hole are mostly circular promptly. When the square pipe is cut, even if the side length of the cross section of the square pipe is smaller than the diameter of the central hole of the chuck, the diagonal line of the cross section of the square pipe is larger than the diameter of the central hole of the chuck, and the chuck with a larger size needs to be arranged on a laser cutting production line, so that the use cost is greatly increased. Therefore, a square hole chuck is designed, a square hole is formed in the center of the chuck body, the inner diameter of the rotating sleeve is correspondingly enlarged, and therefore the square pipe cutting requirements are met. Although the problem is solved to a certain extent through the improvement, the cross section of the rotating sleeve can only be circular due to the fact that the synchronous assembly is sleeved on the rotating sleeve, the rotating sleeve is influenced by the size of the structure, the size of the central square hole is smaller than that of the original circular hole in an expanded mode, the effect is not obvious, and square tube cutting in a smaller size range can only be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide the large-aperture square-hole prepositive pneumatic chuck aiming at the defects in the prior art, so that the size of the center hole of the square-hole chuck is further enlarged on the premise of not changing the overall outer diameter of the chuck, the requirement of cutting a larger-size pipe can be met, and the use cost of pipe cutting is further reduced.

The technical scheme for realizing the aim of the utility model is as follows:

a large-aperture square-hole front pneumatic chuck comprises a base, a chuck body and a rotary sealing assembly, wherein the center of the chuck body is provided with a square hole, the chuck body and the rotary sealing assembly are respectively and coaxially arranged at the front end and the rear end of the base in a rotating mode, a square connecting sleeve corresponding to the square hole is fixedly connected between the front end of the rotary sealing assembly and the chuck body, and a rotary driving assembly fixedly arranged at the front end of the rotary sealing assembly is coaxially arranged outside the square connecting sleeve; the chuck comprises a chuck body and is characterized in that a clamping assembly is arranged at the front end of the chuck body, a supporting assembly is fixedly arranged at the rear end of the chuck body, a synchronizing assembly located between a rotary driving assembly and the chuck body is sleeved on the supporting assembly, and the synchronizing assembly is connected with the clamping assembly and is suitable for driving the clamping assembly to act synchronously.

Further, the synchronizing assembly comprises a first spacer bush, a first synchronizing ring, a second synchronizing ring and a second spacer bush which are coaxially and rotatably arranged from front to back in sequence.

Further, the supporting component comprises a plurality of first limiting columns and second limiting columns which are vertically arranged on the chuck body and are respectively and uniformly arranged along the circumferential direction, and the first limiting columns and the second limiting columns are respectively suitable for supporting the first synchronizing ring and the second synchronizing ring to rotate.

Furthermore, the first limiting column comprises a first pin sleeve fixedly arranged on the chuck body, a first rotating pin inserted into the first pin sleeve is arranged at the top of the first pin sleeve, and the outer peripheral surface of the end part of the first rotating pin is contacted with the inner ring of the first synchronous ring; the second limiting column comprises a second pin sleeve fixedly mounted on the chuck body, a second rotating pin inserted into the second pin sleeve is arranged at the top of the second pin sleeve, and the outer peripheral surface of the end of the second rotating pin is in contact with the inner ring of the second synchronizing ring.

Further, the rotary driving assembly comprises a driven gear ring coaxially arranged between the second spacer bush and the rotary sealing assembly, a bearing is arranged between the driven gear ring and the chuck body and sleeved outside the synchronous assembly, the inner ring of the bearing is fixedly connected with the front end of the driven gear ring, the outer ring of the bearing is fixedly connected with the base, the rear end of the driven gear ring is fixedly connected with the front end of the rotary sealing assembly, the driven gear ring is covered with a shell fixedly arranged on the base, and a speed reducer meshed with the driven gear ring is adjustably arranged on the outer peripheral surface of the shell.

Further, the centre gripping subassembly includes bilateral symmetry slidable mounting first jack catch subassembly and upper and lower symmetry slidable mounting second jack catch subassembly on the chuck body, even fixed mounting has four groups centre gripping drive assembly on the chuck body, and wherein two sets of centre gripping drive assemblies that the symmetry set up all with the outer peripheral face swing joint of first synchronizer ring and be suitable for the action of drive first jack catch subassembly, in addition two sets of centre gripping drive assembly all with the outer peripheral face swing joint of second synchronizer ring and be suitable for the action of drive second jack catch subassembly.

Further, fixed mounting has linear slide rail on the chuck body, first jack catch subassembly and second jack catch subassembly are all through linear slide rail slidable mounting on the chuck body.

Furthermore, the clamping driving assembly comprises an air cylinder fixedly installed on the chuck body, a piston rod of the air cylinder is hinged to a wing-shaped push rod, a swing shaft which is vertically rotatably installed on the chuck body is fixedly arranged in the middle of the push rod, an extending portion is vertically arranged at the other end of the swing shaft, a pin shaft which is rotatably connected with the synchronizing assembly is vertically and fixedly connected to the other end of the extending portion, and the other end of the push rod is movably connected with a sliding block of the linear sliding rail.

Furthermore, centre gripping drive assembly dustcoat is equipped with the dust cover of fixed mounting on the chuck body and between being located adjacent first jack catch subassembly and the second jack catch subassembly, and adjacent dust cover is close to one side fixedly connected with dust guard at chuck center, fixed mounting has the baffle that extends to the dust guard on linear slide's the slider.

Further, a circular positioning groove is formed in the center of the rear end of the rotary sealing assembly.

By adopting the technical scheme, the utility model has the following beneficial effects:

(1) according to the utility model, the square connecting sleeve replaces the connecting function of the rotating sleeve, the supporting component replaces the rotating supporting function of the rotating sleeve, and the traditional chuck design is changed, so that the traditional rotating sleeve design is abandoned, the center of the chuck can be provided with a larger size and penetrates through the front and rear square holes, the requirement of cutting a larger-size pipe is met, and the use cost of pipe cutting is further reduced.

(2) The first spacer and the second spacer are arranged, so that the axial positions of the first synchronizing ring and the second synchronizing ring are limited, and the first synchronizing ring and the second synchronizing ring can be connected with the clamping assembly.

(3) The supporting assembly is of a structure with a plurality of limiting columns, the structure is simple, the manufacturing cost is low, meanwhile, the occupied space is small, the chuck can be provided with a central hole with a larger area, the contact area with the synchronous ring is small, friction is reduced, and the synchronous ring can rotate more flexibly.

(4) The first limiting column and the second limiting column are simple in structural design, the outer peripheral surfaces of the end parts of the first rotating pin and the second rotating pin are respectively contacted with the inner rings of the first synchronizing ring and the second synchronizing ring, so that the radial supporting effect on the synchronizing rings can be achieved, and the circumferential rotation of the synchronizing rings is smoother.

(5) The rotary driving component drives the driven gear ring to rotate through the speed reducer so as to drive the square connecting sleeve and the chuck body to rotate, and the rotating function of the chuck is realized.

(6) The two first jaw assemblies realize synchronous motion under the action of the two groups of clamping driving assemblies and the first synchronizing ring, and the two second jaw assemblies realize synchronous motion under the action of the other two groups of clamping driving assemblies and the second synchronizing ring, so that the pipe clamping performance is improved.

(7) According to the chuck, the linear slide rail is adopted to realize that the clamping jaw assembly is slidably arranged on the chuck body, and compared with the traditional chuck, the chuck has the advantages that the T-shaped groove is formed in the chuck body, and the sliding block is arranged in the T-shaped groove, so that the structure is simplified, meanwhile, the sliding friction force is greatly reduced, and the clamping jaws can move more smoothly.

(8) The clamping driving assembly pushes the push rod to rotate around the swinging shafts through the air cylinder, so that the sliding block is pushed to drive the clamping jaws to move, and as the other ends of the symmetrically arranged swinging shafts are connected with the same synchronizing ring, when one of the swinging shafts rotates, the synchronizing ring is driven to rotate, so that the linkage of the other swinging shaft is realized, and further, the synchronous motion of the symmetrically arranged clamping jaws is realized.

(9) According to the chuck, the dustproof effect of the whole chuck is improved by arranging the combination form of the dustproof cover, the dustproof plate and the baffle.

(10) The center of the rear end of the rotary sealing assembly is provided with the circular positioning groove, so that the rotary sealing assembly is convenient to position and mount with a laser cutting machine.

Drawings

In order that the manner in which the present invention is more fully understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, wherein:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a rear view of the present invention;

FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2;

FIG. 4 is a partial enlarged view of FIG. 3 at B;

FIG. 5 is a schematic view of a clamp driving assembly according to the present invention;

FIG. 6 is a schematic view of the support assembly of the present invention;

FIG. 7 is a schematic view of the construction of the swing shaft of the present invention.

The reference numbers in the figures are:

the device comprises a base 1, a chuck body 2, a rotary sealing assembly 3, a positioning groove 3-1, a square connecting sleeve 4, a rotary driving assembly 5, a driven gear ring 5-1, a speed reducer 5-2, a clamping assembly 6, a first jaw assembly 6-1, a second jaw assembly 6-2, a linear slide rail 6-3, an air cylinder 6-4, an extending portion 6-6-1, a push rod 6-5, a swing shaft 6-6, a pin shaft 6-7, a supporting assembly 7, a first limiting column 7-1, a first pin sleeve 7-1-1, a first rotating pin 7-1-2, a second limiting column 7-2, a second pin sleeve 7-2-1, a second rotating pin 7-2-2, a synchronizing assembly 8, a first spacer sleeve 8-1, a first synchronizing ring 8-2, a second synchronizing ring 8-2, A second synchronizing ring 8-3, a second spacer 8-4, a bearing 9, a shell 10, a dust cover 11, a dust guard 12 and a baffle 13.

Detailed Description

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

(example 1)

As the leading air chuck in large aperture square hole that fig. 1 to fig. 7 show, which comprises a base 1, chuck body 2, rotary seal subassembly 3, square adapter sleeve 4, rotary drive subassembly 5, clamping component 6, supporting component 7 and synchronous subassembly 8, wherein chuck body 2, square adapter sleeve 4 and rotary seal subassembly 3 are coaxial fixed continuous in proper order, chuck body 2 and rotary seal subassembly 3 are coaxial rotation respectively and are located both ends around base 1 simultaneously, the square hole corresponding with square adapter sleeve 4 has all been seted up at chuck body 2 and rotary seal subassembly 3's center. The rotary driving assembly 5 is sleeved outside the square connecting sleeve 4 and is fixedly installed at the front end of the rotary sealing assembly 3, the clamping assembly 6 is arranged at the front end of the chuck body 2 and is connected with the synchronizing assembly 8, the supporting assembly 7 is fixedly installed at the rear end of the chuck body 2, and the synchronizing assembly 8 is located between the rotary driving assembly 5 and the chuck body 2 and is sleeved on the supporting assembly 7. Replace the connection function who rotates the cover through square adapter sleeve 4, replace the rotation support function who rotates the cover through supporting component 7, changed traditional chuck design to give up traditional rotation cover design, make the chuck center can set up oversize and run through square hole from beginning to end, satisfy the tubular product cutting of bigger specification, further reduced the use cost of tubular product cutting.

Specifically, the rotary driving assembly 5 comprises a driven gear ring 5-1 and a speed reducer 5-2 meshed with the driven gear ring 5-1, a bearing 9 sleeved outside the synchronizing assembly 8 is arranged between the driven gear ring 5-1 and the chuck body 2, the inner ring of the bearing 9 is fixedly connected with the front end of the driven gear ring 5-1, the outer ring is fixedly connected with the base 1, and the driven gear ring 5-1 is coaxially arranged between the synchronizing assembly 8 and the rotary sealing assembly 3 and is fixedly connected with the front end of the rotary sealing assembly 3. The driven gear ring 5-1 is covered with a shell 10 fixedly arranged on the base 1, and the speed reducer 5-2 is adjustably arranged on the peripheral surface of the shell 10. The driven gear ring 5-1 is driven to rotate through the speed reducer 5-2, so that the square connecting sleeve 4 and the chuck body 2 are driven to rotate, and the rotation function of the chuck is realized.

The clamping assembly 6 comprises a first clamping jaw assembly 6-1, a second clamping jaw assembly 6-2, linear sliding rails 6-3 and a clamping driving assembly, wherein the number of the linear sliding rails 6-3 is four, the linear sliding rails are uniformly and fixedly arranged on the chuck body 1 along the circumferential direction, the first clamping jaw assembly 6-1 is provided with two sliding blocks which are fixedly arranged on the linear sliding rails 6-3 which are vertically symmetrical, and the second clamping jaw assembly 6-2 is provided with two sliding blocks which are fixedly arranged on the linear sliding rails 6-3 which are horizontally symmetrical. The linear sliding rails 6-3 are used for realizing that the clamping jaw assembly is slidably arranged on the chuck body 1, and compared with the traditional chuck in which a T-shaped groove is formed in the chuck body and a sliding block is arranged in the T-shaped groove, the structure is simplified, and meanwhile, the sliding friction force is greatly reduced, so that the clamping jaw can move more smoothly.

The clamping driving assembly is provided with four groups, each group comprises an air cylinder 6-4, a push rod 6-5, a swinging shaft 6-6 and a pin shaft 6-7, wherein the air cylinder 6-4 is fixedly arranged on the chuck body 1, the push rod 6-5 is wing-shaped, one end of the push rod is hinged with a piston rod of the air cylinder 6-4, and the other end of the push rod is movably connected with a sliding block of the linear sliding rail 6-3, so that the first jaw assembly 6-1 and the second jaw assembly 6-2 are driven to move along the radial direction of the chuck. The swing shaft 6-6 is vertically fixed on the chuck body 1 which is rotatably arranged, one end of the swing shaft is fixedly connected with the middle part of the push rod 6-5, the other end of the swing shaft is vertically provided with an extension part 6-6-1, and the pin shaft 6-7 is vertically and fixedly arranged at the other end of the extension part 6-6-1.

The supporting component 7 comprises a first limiting column 7-1 and a second limiting column 7-2, wherein the number of the first limiting column 7-1 and the number of the second limiting column 7-2 are respectively four, and the four limiting columns are uniformly and vertically arranged on the chuck body 1 along the circumferential direction. The synchronizing assembly 8 comprises a first spacer 8-1, a first synchronizing ring 8-2, a second synchronizing ring 8-3 and a second spacer 8-4 which are coaxially and rotatably arranged from front to back in sequence. The supporting component 7 adopts a structure of a limiting column, the design is simple, the manufacturing cost is low, and meanwhile, the occupied space is small, so that a central hole with a larger area can be formed in the chuck, the contact area with the synchronizing component 8 is small, the friction can be reduced, and the synchronizing component 8 can rotate more flexibly. The first limiting column 7-1 comprises a first pin sleeve 7-1-1 fixedly arranged on the chuck body 1, a first rotating pin 7-1-2 inserted into the first pin sleeve 7-1-1 is arranged at the top of the first pin sleeve 7-1-1, and the outer peripheral surface of the end part of the first rotating pin 7-1-2 is contacted with the inner ring of the first synchronous ring 8-2; the second limiting column 7-2 comprises a second pin sleeve 7-2-1 fixedly mounted on the chuck body 1, a second rotating pin 7-2-2 inserted into the second pin sleeve 7-2-1 is arranged at the top of the second pin sleeve 7-2-1, and the outer peripheral surface of the end part of the second rotating pin 7-2-2 is in contact with the inner ring of the second synchronizing ring 8-3.

The other ends of two pin shafts 6-7 in transmission connection with the first jaw assembly 6-1 are rotatably connected with the first synchronizing ring 8-2, and the other ends of the other two pin shafts 6-7 are rotatably connected with the second synchronizing ring 8-3, so that when one oscillating shaft 6-6 rotates, the other oscillating shaft 6-6 is linked, and further, the jaws which are symmetrically arranged synchronously move. The first spacer 8-1 and the second spacer 8-4 are provided to define the axial positions of the first synchronizer ring 8-2 and the second synchronizer ring 8-3 so that they can be connected to the pin 6-7.

The outer cover of the clamping driving assembly is provided with the dust cover 11 which is fixedly installed on the chuck body 1 and located between the adjacent first jaw assembly 6-1 and the second jaw assembly 6-2, one side, close to the center of the chuck, of the adjacent dust cover 11 is fixedly connected with the dust guard 12, and the baffle 13 extending to the dust guard 12 is fixedly installed on the sliding block of the linear sliding rail 6-3, so that the appearance is attractive, and meanwhile, the integral dust-proof effect of the chuck is improved.

The center of the rear end of the rotary sealing component 3 is also provided with a circular positioning groove 3-1, so that the rotary sealing component is convenient to position and mount with a laser cutting machine.

This embodiment replaces the connection function who rotates the cover through square adapter sleeve 4, replaces the rotation support function who rotates the cover through supporting component 7, has changed traditional chuck design to give up traditional rotation cover design, made the chuck center can set up bigger size and run through the square hole around, satisfy the tubular product cutting of bigger specification, further reduced the use cost of tubular product cutting.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a leading air chuck of large aperture square hole which characterized in that: the rotary sealing device comprises a base (1), a chuck body (2) and a rotary sealing component (3), wherein the center of the chuck body is provided with a square hole, the chuck body (2) and the rotary sealing component (3) are respectively and coaxially arranged at the front end and the rear end of the base (1) in a rotating mode, a square connecting sleeve (4) corresponding to the square hole is fixedly connected between the front end of the rotary sealing component (3) and the chuck body (2), and a rotary driving component (5) fixedly arranged at the front end of the rotary sealing component (3) is coaxially arranged outside the square connecting sleeve (4); the front end of chuck body (2) is equipped with centre gripping subassembly (6), and the rear end is fixed to be equipped with supporting component (7), the cover is equipped with and is located synchronous subassembly (8) between rotation driving subassembly (5) and chuck body (2) on supporting component (7), synchronous subassembly (8) link to each other with centre gripping subassembly (6) and are suitable for drive centre gripping subassembly (6) synchronization action.

2. The large-aperture square hole forward air chuck as claimed in claim 1, wherein: the synchronous component (8) comprises a first spacer bush (8-1), a first synchronous ring (8-2), a second synchronous ring (8-3) and a second spacer bush (8-4) which are coaxially and rotatably arranged from front to back in sequence.

3. The large-aperture square hole forward air chuck of claim 2, wherein: the supporting component (7) comprises a plurality of first limiting columns (7-1) and a plurality of second limiting columns (7-2) which are vertically arranged on the chuck body (2) and are respectively suitable for supporting the first synchronizing ring (8-2) and the second synchronizing ring (8-3) to rotate.

4. The large-aperture square hole forward air chuck of claim 3, wherein: the first limiting column (7-1) comprises a first pin sleeve (7-1-1) fixedly mounted on the chuck body (2), a first rotating pin (7-1-2) inserted into the first pin sleeve (7-1-1) is arranged at the top of the first pin sleeve (7-1-1), and the outer peripheral surface of the end part of the first rotating pin (7-1-2) is in contact with the inner ring of the first synchronizing ring (8-2); the second limiting column (7-2) comprises a second pin sleeve (7-2-1) fixedly mounted on the chuck body (2), a second rotating pin (7-2-2) inserted into the second pin sleeve (7-2-1) is arranged at the top of the second pin sleeve (7-2-1), and the outer peripheral surface of the end part of the second rotating pin (7-2-2) is in contact with the inner ring of the second synchronizing ring (8-3).

5. The large-aperture square hole pre-pneumatic chuck as claimed in claim 2, wherein: the rotary driving assembly (5) comprises a driven gear ring (5-1) coaxially arranged between a second spacer sleeve (8-4) and a rotary sealing assembly (3), a bearing (9) sleeved outside the synchronous assembly (8) is arranged between the driven gear ring (5-1) and a chuck body (2), the inner ring of the bearing (9) is fixedly connected with the front end of the driven gear ring (5-1), the outer ring of the bearing is fixedly connected with a base (1), the rear end of the driven gear ring (5-1) is fixedly connected with the front end of the rotary sealing assembly (3), a shell (10) fixedly mounted on the base (1) is arranged on the outer cover of the driven gear ring (5-1), and a speed reducer (5-2) meshed with the driven gear ring (5-1) is adjustably mounted on the outer peripheral surface of the shell (10).

6. The large-aperture square hole pre-pneumatic chuck as claimed in claim 2, wherein: the clamping assembly (6) comprises a first jaw assembly (6-1) which is arranged on the chuck body (2) in a bilateral symmetry sliding mode and a second jaw assembly (6-2) which is arranged on the chuck body (2) in an up-down symmetry sliding mode, four groups of clamping driving assemblies are uniformly and fixedly arranged on the chuck body (2), two groups of clamping driving assemblies which are symmetrically arranged are movably connected with the outer peripheral surface of the first synchronizing ring (8-2) and are suitable for driving the first jaw assembly (6-1) to move, and the other two groups of clamping driving assemblies are movably connected with the outer peripheral surface of the second synchronizing ring (8-3) and are suitable for driving the second jaw assembly (6-2) to move.

7. The large-aperture square hole forward air chuck of claim 6, wherein: the chuck is characterized in that a linear sliding rail (6-3) is fixedly mounted on the chuck body (2), and the first jaw assembly (6-1) and the second jaw assembly (6-2) are slidably mounted on the chuck body (2) through the linear sliding rail (6-3).

8. The large-aperture square hole forward air chuck of claim 6, wherein: the clamping driving assembly comprises an air cylinder (6-4) fixedly mounted on the chuck body (2), a piston rod of the air cylinder (6-4) is hinged to a wing-shaped push rod (6-5), the middle of the push rod (6-5) is fixedly provided with a swing shaft (6-6) which is vertically and rotatably mounted on the chuck body (2), the other end of the swing shaft (6-6) is vertically provided with an extension part (6-6-1), the other end of the extension part (6-6-1) is vertically and fixedly connected with a pin shaft (6-7) which is rotatably connected with the synchronizing assembly (8), and the other end of the push rod (6-5) is movably connected with a sliding block of the linear sliding rail (6-3).

9. The large-aperture square hole forward air chuck of claim 7, wherein: the clamping driving assembly outer cover is provided with a dust cover (11) which is fixedly installed on the chuck body (2) and located between the adjacent first jaw assembly (6-1) and the second jaw assembly (6-2), one side of the adjacent dust cover (11) close to the center of the chuck is fixedly connected with a dust guard (12), and a baffle (13) extending to the dust guard (12) is fixedly installed on a sliding block of the linear sliding rail (6-3).

10. The large-aperture square hole forward air chuck of claim 1, wherein: and a circular positioning groove (3-1) is formed in the center of the rear end of the rotary sealing assembly (3).

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