Full-stroke laser tube cutting chuck

Abstract

The present invention provides a full-stroke laser tube cutting chuck, comprising a frame, a rotary drive mechanism and a spindle mounted on the frame, a front cover mounted in front of the spindle, a connecting sleeve fixedly connected to the front cover and the spindle at its front and rear ends, two pairs of clamping jaws mounted on the front side of the front cover, an anti-pinching mechanism for preventing pinching, and a synchronous drive mechanism for synchronously driving the two pairs of clamping jaws. The synchronous drive mechanism comprises a cylinder, a push plate fixedly connected to the piston rod of the cylinder, four drive screws each equipped with at least one drive nut, rotary support bearings supporting the rotation of the drive screws, a shift fork fixedly mounted at the front end of each drive screw, and four power wedges, each of which is transmission-connected to a shift fork; the rotary support bearings are fixedly mounted in the front cover and the spindle; a clamping jaw is fixedly mounted on the front side of each power wedge; during operation, the drive nut cooperates with the drive screw to convert the linear power of the cylinder into the rotational power of the drive screw. The present invention has a simple structure, reliable operation, good economic efficiency, and high synchronization accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of laser tube cutting auxiliary tools, and in particular to a full-stroke laser tube cutting chuck. Background Art

[0002] Chucks are essential auxiliary tools on laser cutting machine production lines. Two chucks are usually required for use. Based on the chuck structure and their placement on the production line, the industry refers to the two cooperating chucks as front and tail chucks. These two chucks are structurally distinct. During machining, the tail and front chucks clamp the workpiece together. During machining, the tail chuck gradually approaches the front chuck and works in conjunction with the front chuck. Common pneumatic tail chucks, such as those disclosed in authorization announcement number CN215846416U and publication number CN115446472A, generally use cylinders as their power source, with a synchronous transmission mechanism between the cylinder and the clamping jaws, typically levers and racks. The synchronous transmission mechanism mainly composed of gears and racks used in the existing tail cards takes up a large space and is difficult to install in the limited space of the tail cards. In addition, the synchronous transmission mechanism mainly composed of gears and racks will affect the working accuracy due to wear during use, and it is very difficult to restore and adjust it. Due to the structural limitations of the transmission mechanism of the existing tail cards, it is difficult for the clamping jaws to operate throughout the full stroke (the two pairs of clamping jaws can move from the maximum open state to the respective engaged states, which is called the full stroke in the industry). Therefore, during use, the clamping jaws need to be replaced frequently for workpieces of different sizes, which affects work efficiency. In addition, the existing tail cards either do not have an anti-pinching mechanism to prevent the clamping jaws from pinching or crushing the workpiece, or the anti-pinching mechanism is relatively complex, which further increases the difficulty of installing the various components in the tail cards. Summary of the Invention

[0003] The purpose of the present invention is to provide a full-stroke anti-pinching laser tube cutting chuck used as a tail card with a synchronous drive mechanism and an anti-pinching mechanism of a completely new structural design, so as to solve the corresponding technical problems existing in the existing tail cards.

[0004] The technical solution of the present invention is: a full-stroke laser tube cutting chuck, comprising a frame, a rotary drive mechanism arranged on the frame, a main shaft rotatably arranged on the frame and connected to the rotary drive mechanism, a front cover arranged in front of the main shaft, a connecting sleeve fixedly connected to the front cover and the main shaft at the front and rear ends respectively, four clamping jaws, two of which are arranged opposite to each other in the upper and lower directions and the left and right directions and movably arranged on the front side of the front cover, and its structural characteristics are: it also includes a synchronous drive mechanism for synchronously driving the two pairs of clamping jaws to move toward or away from each other, the synchronous drive mechanism includes a cylinder as a power source, a push rod fixedly connected to the piston rod of the cylinder and arranged in front of the cylinder Plate, four driving screws, each driving screw is equipped with at least one driving nut which cooperates with its thread and is fixed on the cylinder or the push plate for converting the linear motion of the cylinder and the push plate into the rotational motion of the driving screw, a rotation support bearing is fixedly provided at the front and rear ends of each driving screw, a shift fork is fixedly provided at the front end of each driving screw, and four power wedges which are movably provided on the front cover and each is connected to a corresponding shift fork in transmission; the rotation support bearings on the front and rear ends of each driving screw are respectively fixed in the front cover and the main shaft; the above-mentioned four clamping jaws are fixedly provided on the front end surfaces of the four power wedges.

[0005] A further solution is: the above-mentioned cylinder also has a cylinder body, a front end cover and a rear end cover, the outer periphery of the front end cover and the rear end cover of the above-mentioned cylinder protrudes outward relative to the cylinder body, and the front end cover and the rear end cover are each provided with four front-to-back through-holes for mounting on their protruding outer peripheries; the above-mentioned push plate is a plate structure member with an overall circular shape, and the outer periphery of the push plate is provided with four front-to-back through-holes for mounting.

[0006] A further solution is: each drive screw is equipped with a drive nut, two of the four drive nuts are fixedly set in two mounting holes opposite to each other in the upper and lower directions or left and right directions of the push plate; the other two of the four drive nuts are fixedly set in two mounting holes opposite to each other in the left and right directions or up and down directions of the front cover or the rear end cover.

[0007] A further solution is: two of the four drive screws are each equipped with a drive nut, and the two drive nuts are each fixedly set in two mounting holes opposite to each other in the upper and lower directions or left and right directions of the push plate; the other two of the four drive screws are each equipped with two drive nuts, and the four drive nuts are each fixedly set in two mounting holes opposite to each other in the left and right directions or up and down directions of the front cover and the rear end cover.

[0008] A further solution is: the above-mentioned front cover includes a main body and a pressure plate fixed on the front side of the above-mentioned main body; four mounting grooves are provided on the main body facing forward, each mounting groove is provided with a driving screw through hole, and the pressure plate is provided with four power wedge movable grooves in the up and down and left and right directions, and four bearing mounting countersunk holes are provided on the pressure plate and the above-mentioned main shaft; the rotating support bearings fixed on the front and rear ends of the four driving screws are fixedly arranged in each of the four bearing mounting countersunk holes of the pressure plate and the main shaft; four shift forks are movably arranged in the four mounting grooves of the main body of the front cover and are transmission connected to the corresponding power wedge.

[0009] A further solution is: the above-mentioned shift fork includes a base plate and a shift rod that is integral with or fixedly connected to the above-mentioned base plate and extends forward, and the rear end of the above-mentioned power wedge is provided with a shift rod accommodating groove; the shift fork is fixedly connected to the front end of the driving screw by its base plate, and the shift fork is extended into the shift rod accommodating groove of the power wedge by its shift rod to realize transmission connection, and the middle part of each power wedge can be slidably arranged in a corresponding power wedge movable groove of the pressure plate of the front cover.

[0010] A further solution is that the drive nut is composed of a single nut, or is composed of two nuts that cooperate with each other.

[0011] A further solution is: the above-mentioned full-stroke laser tube cutting chuck also includes an anti-pinching mechanism, the above-mentioned anti-pinching mechanism includes an anti-pinching screw and two sets of limiting nuts that cooperate with the anti-pinching screw thread, the above-mentioned anti-pinching screw can movably pass through the anti-pinching screw through holes provided on the push plate and the front end cover and the rear end cover of the cylinder, and the front and rear ends of the anti-pinching screw are fixedly connected to the front cover and the main shaft respectively; one of the two sets of limiting nuts is adjustably arranged on the front side of the above-mentioned push plate on the anti-pinching screw, and the other set of limiting nuts is adjustably arranged on the rear side of the front end cover or the rear side of the rear end cover of the cylinder on the anti-pinching screw.

[0012] A further solution is: the above-mentioned connecting sleeve is a structural member with a hollow cylindrical shape as a whole, a hollow part is provided on the wall of the connecting sleeve, and the connecting sleeve is equipped with a cover of a cylindrical plate body, which is fixed to the outer periphery of the connecting sleeve and closes the hollow part of the connecting sleeve.

[0013] The present invention has positive effects: (1) The present invention uses a new structural design of the synchronous drive mechanism, so that a set of mechanisms can not only realize the full-stroke drive of the two pairs of jaws, but also realize the precise synchronization of the movement of the two pairs of jaws. Compared with the tail clamps of the lever and gear rack transmission mechanism commonly used in the prior art, the stroke of the two pairs of jaws of the present invention can be greatly increased. Therefore, during use, the types of jaws and the frequency of jaw replacement can be greatly reduced for workpieces of different sizes, thereby improving work efficiency. (2) The synchronous drive mechanism of the present invention outputs the linear power of the cylinder through the rotation of the drive nut and the drive screw. The transmission is reliable, the overall structure is simple, and it is easy to install in the limited space of the tail clamp, thereby effectively solving the problems of the lever and gear rack drive mechanism commonly used in the prior art, such as the large space occupied in the tail clamp and the inconvenient installation, and the gear rack mechanism affecting the accuracy due to rapid wear during operation. (3) After the basic model of the chuck manufactured using the synchronous drive mechanism of the present invention is finalized, to manufacture other tail chucks of different models and specifications, it is only necessary to select a drive nut and a drive screw with the corresponding pitch. The other structures do not need to be changed to manufacture a series of tail chucks of the required models and specifications. This has good versatility and economy. In addition, the screw and nut are both market standard parts, which are easy to obtain and low in cost. (4) The anti-pinching mechanism of the present invention consists of an anti-pinching screw and two sets of limit nuts. Compared with the anti-pinching mechanism in the prior art, it has a simple structure, low cost, and convenient stroke adjustment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 To remove Figure 1 Schematic diagram of the structure behind the cover equipped with the middle connecting sleeve;

[0016] Figure 3 To remove Figure 2 Schematic diagram of the structure after the middle connection sleeve;

[0017] Figure 4 For Figure 3 Schematic diagram of the structure when viewed from different angles;

[0018] Figure 5 To remove Figure 3 Schematic diagram of the structure behind the pressure plate of the middle clamping jaw and the front cover;

[0019] Figure 6 To remove Figure 4 A schematic diagram of the structure behind the main body of the middle front cover;

[0020] Figure 7 This is a schematic diagram of the driving structure of a gripper using a simplified drawing method.

[0021] The reference numerals in the above drawings are as follows:

[0022] Clamping jaw 1, left and right clamping jaw 11, up and down clamping jaw 12; front cover 2, main body 21, mounting slot 21-1, pressure plate 22, power wedge movable slot 22-1; main shaft 3; connecting sleeve 4, cover 41; synchronous drive mechanism 5, cylinder 51, cylinder body 51-1, front end cover 51-2, rear end cover 51-3, piston rod 51-4, push plate 52, drive screw 53, drive nut 53-1, rotary support bearing 54, shift fork 55, base plate 55-1, shift rod 55-2, power wedge 56, shift rod accommodating slot 56-1; anti-pinching mechanism 6, anti-pinching screw 61, limit nut 62; frame 7, rotary drive mechanism 8. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] (Example 1)

[0025] See Figures 1 to 7 The full-stroke laser tube cutting chuck of this embodiment is mainly composed of a clamping jaw 1, a front cover 2, a main shaft 3, a connecting sleeve 4, a synchronous drive mechanism 5, an anti-pinching mechanism 6, a frame 7 and a rotation drive mechanism 8.

[0026] The clamping jaws 1 are used in the chuck of this embodiment to clamp the workpiece during operation. The clamping jaws 1 include two left-right clamping jaws 11 and two up-down clamping jaws 12. The clamping jaws 1 are prior art and their structure is not described in detail.

[0027] The front cover 2 is a generally circular structure. It comprises a main body 21 and a pressure plate 22 fixed to the front side of the main body 21. The main body 21 is provided with four mounting slots 21-1 facing forward, each containing a drive screw hole (not labeled in the figure) that extends through the main body 21. The pressure plate 22 is provided with four power wedge movable slots 22-1, located vertically and horizontally. The pressure plate 22 is also provided with four bearing mounting countersunk holes (not labeled in the figure) that extend forward from its rear end.

[0028] The spindle 3 is provided with four bearing mounting counterbores recessed rearward from its front end. The connecting sleeve 4 is an overall hollow cylindrical structural member with hollowed-out sections on its walls. This reduces the overall weight of the chuck while ensuring connection strength and facilitates stroke adjustment and setting operations for related components, including the anti-pinching mechanism 6. The front and rear ends of the connecting sleeve 4 are fixedly connected to the main body 21 of the front cover 2 and the spindle 3, respectively. Preferably, the connecting sleeve 4 is equipped with a cylindrical plate-shaped cover 41, which is fixedly mounted on the outer periphery of the connecting sleeve 4 and is used to prevent dust from entering the chuck through the hollowed-out sections of the connecting sleeve 4.

[0029] The synchronous drive mechanism 5 primarily comprises a cylinder 51, which serves as the power source for the four gripping jaws 1; a push plate 52 fixedly connected to the piston rod 51-4 of the cylinder 51; four drive screws 53; a rotation support bearing 54 for supporting the rotation of the drive screws 53; a shift fork 55 fixedly mounted on the drive screws 53; and a power wedge 56 drivingly connected to the shift fork 55. Each drive screw 53 is equipped with at least one drive nut 53-1, which is threadably engaged with the drive screw 53 and fixedly mounted on the cylinder 51 or push plate 52 to convert the linear motion of the cylinder 51 and push plate 52 into rotational motion of the drive screw 53.

[0030] The cylinder 51 mainly consists of a cylinder body 51-1, a front end cover 51-2 and a rear end cover 51-3 which are airtightly arranged on the front and rear sides of the cylinder body 51-1, a piston rod 51-4 which extends forward from the middle of the front end cover 51-2 in an airtight manner, and a piston (not shown in the figure) which is movably arranged in the cylinder body 51-1 and fixedly connected to the inner end of the piston rod 51-4; as a preferred embodiment, the outer periphery of the front end cover 51-2 and the rear end cover 51-3 of the cylinder 51 of this embodiment protrudes outward relative to the cylinder body 51-1, and the front end cover 51-2 and the rear end cover 51-3 are each provided with four front-to-back through-holes for mounting and one through-hole for preventing the screw from being pinched. The push plate 52 is a plate structure with an overall circular shape. The outer periphery of the push plate 52 is provided with four front-to-back through-holes for installation and one through-hole for preventing the screw from being pinched. The holes on the push plate 52 correspond to the positions of the holes on the front cover 51-2 and the rear cover 51-3. The push plate 52 is fixedly connected to the front end of the piston rod 51-4 of the cylinder 51 at the middle of its rear end surface.

[0031] The drive nut 53-1 and the drive screw 53 can be arranged in the following manner: first, each drive screw 53 is equipped with a drive nut 53-1 that is threadedly matched with it, that is, there are four drive nuts 53-1 in total, two of the four drive nuts 53-1 are fixedly set in two mounting holes opposite to each other in the upper and lower directions or two mounting holes opposite to each other in the left and right directions of the push plate 52; the other two of the four drive nuts 53-1 are respectively fixed in two mounting holes opposite to each other in the left and right directions or the upper and lower directions of the front cover 51-2 or the rear end cover 51-3. Secondly, two of the four drive screws 53 are each equipped with a threaded drive nut 53-1, and these two drive nuts 53-1 are each fixedly mounted in two mounting holes that are opposite each other in the vertical or horizontal directions of the push plate 52. The remaining two of the four drive screws 53 are each equipped with two threaded drive nuts 53-1, for a total of four, and these four drive nuts 53 are each fixedly mounted in two mounting holes that are opposite each other in the horizontal or vertical directions of the front cover 51-2 and the rear cover 51-3. The remaining mounting holes in the front cover 51-2 and the rear cover 51-3 of the cylinder 51 and the push plate 52 that are not equipped with drive nuts 53-1 are used for the passage of the corresponding drive screws 53.

[0032] The drive nut 53-1 can be composed of a single nut that is adapted to the length of the installation holes of the front cover 51-2 and the rear cover 51-3 of the cylinder 51 and the installation hole of the push plate 52, or it can be composed of two nuts arranged relative to each other in the installation hole where the drive nut 53-1 needs to be installed.

[0033] A rotation support bearing 54 is provided at each of the front and rear ends of each driving screw 53. The four rotation support bearings 54 located on the front side are each fixedly connected by their outer rings to the pressure plate 22 of the front cover 2, and are each fixedly provided in the four bearing mounting countersunk holes of the pressure plate 22. The four rotation support bearings 54 located on the front side are each fixedly connected by their inner rings to the front end heads of the four driving screws 53 extending forward after passing through the four mounting grooves 21-1 of the main body 21 of the front cover 2; the four rotation support bearings 54 located on the rear side are each fixedly connected by their outer rings to the main shaft 3, and are each fixedly provided in the four bearing mounting countersunk holes of the main shaft 3. The four rotation support bearings 54 located on the rear side are each fixedly connected by their inner rings to the rear end heads of the four driving screws 53, so that each driving screw 53 can rotate under the drive of the corresponding driving nut 53-1 by relying on the rotation support bearings 54 at its front and rear ends. The shift fork 55 is composed of a base plate 55-1 and a shift rod 55-2 that is integral with or fixedly connected to the base plate 55-1 and extends forward. There are four shift forks 55, and one of the four shift forks 55 is arranged in each of the four mounting grooves 21-1 of the main body 21 of the front cover 2. Each shift fork 55 is fixedly connected to the front end of a corresponding drive screw 53 by its base plate 55-1 and is located on the rear side of the corresponding rotation support bearing 54, so that each shift fork 55 can rotate with the corresponding drive screw 53. The rear end of the power wedge 56 is provided with a shift rod accommodating groove 56-1. Four power wedges 56 are movably provided in the front cover 2. Specifically, each power wedge 56 is arranged in a mounting groove 21-1 of the front cover 2 by its rear end and makes the shift rod 55-2 of a corresponding shift fork 55 extend into the shift rod accommodating groove 56-1 of the power wedge 56 to realize transmission connection. Each power wedge 56 is slidably arranged in a corresponding power wedge movable groove 22-1 of the pressure plate 22 of the front cover 2 by its middle part. The front end of each power wedge 56 extends forward and is fixedly connected to a clamping claw 1.

[0034] The working principle and process of the synchronous drive mechanism 5 driving the two pairs of clamping jaws 1 to move are briefly described as follows:

[0035] When the rodless chamber of the cylinder 51 is inhaled, the piston rod 51-4 extends forward, pushing the push plate 52 to move forward linearly, and at the same time pushing the cylinder body 51-1, the front end cover 51-2 and the rear end cover 51-3 to move linearly backward as a whole, and the four driving screws 53 are driven by the drive nut 53-1 to rotate synchronously, and the rotation of the four driving screws 53 drives the four shift forks 55 to rotate, and each of the four shift forks 55 is matched with the shift rod receiving groove 56-1 of the corresponding power wedge 56 by its shift rod 55-2 to drive the power wedge 56 to each corresponding one on the pressure plate 22 of the front cover 2 The power wedge block moves synchronously in the movable groove 22-1 to clamp the workpiece. If there is no workpiece, the two left and right clamping jaws 11 and the two up and down clamping jaws 12 can be engaged respectively to realize the full stroke operation of the chuck; similarly, when the rod chamber of the cylinder 51 is filled with air, the piston rod 51-4 retracts into the cylinder body 51-1, and the synchronous drive mechanism 5 moves in the opposite direction to the above-mentioned direction, so that the two left and right clamping jaws 11 and the two up and down clamping jaws 12 move synchronously in opposite directions to release the clamped workpiece, and the two pairs of clamping jaws 1 move to the set maximum opening distance.

[0036] As can be seen from the above, the synchronous drive mechanism 5 of this embodiment is designed with a new structure, so that its set of mechanisms can not only realize the full-stroke drive of the two pairs of jaws 1, but also realize the precise synchronous movement of the two pairs of jaws 1. The chuck of this embodiment using the synchronous drive mechanism 5 has a significantly increased stroke of the two pairs of jaws 1 compared to the tail clamps with levers and gear rack transmission mechanisms commonly used in the prior art. Therefore, during use, the types of jaws and the frequency of jaw replacement can be greatly reduced for workpieces of different sizes, thereby improving work efficiency; the synchronous drive mechanism 5 outputs the linear power of the cylinder through the rotational coordination of the drive nut 53-1 and the drive screw 53, and the transmission operation is reliable, the overall structure is simple, and it is easy to install in the limited space of the tail clamp, thereby effectively solving the problems of the lever and gear rack drive mechanisms commonly used in the prior art, such as the large space occupied in the tail clamp and the inconvenient installation, and the gear rack mechanism affecting the accuracy due to rapid wear during operation. In addition, after the chuck of this embodiment using the synchronous drive mechanism 5 of this embodiment is finalized, to manufacture tail cards of different models and specifications, it is only necessary to select the drive nut 53-1 and the drive screw 53 with the corresponding pitch to manufacture the tail card of the required model and specification, which has good versatility and economy, and the screw and nut are both market standard parts, which are easy to obtain and low in cost.

[0037] The anti-flattening mechanism 6 mainly consists of an anti-flattening screw 61 and a limiting nut 62 that is threadedly engaged with the anti-flattening screw 61. The anti-flattening screw 61 can movably pass through the anti-flattening screw passage holes provided on the front cover 51-2 and rear cover 51-3 of the cylinder 51 and the push plate 52, and the front and rear ends of the anti-flattening screw 61 are respectively fixedly connected to the body 21 of the front cover 2 and the main shaft 3. Two sets of limiting nuts 62 are provided on the anti-flattening screw 61, one set of limiting nuts 62 is provided on the front side of the push plate 52, and the other set of limiting nuts 62 is provided on the rear side of the front cover 51-2 or the rear side of the rear cover 51-3 of the cylinder 51. The anti-flattening mechanism 6 is provided as a preferred method for the chuck of this embodiment.

[0038] During operation, after determining the stroke of the two sets of jaws 1 according to the size of the workpiece to be clamped, the maximum required spacing between the front cover 51-2 or rear cover 51-3 of the cylinder 51 and the push plate 52 can be determined accordingly. The distance between the two sets of limit nuts 62 on the anti-flattening screw 61 can then be adjusted to the required position. During operation, when the front cover 51-2 of the cylinder 51 and the push plate 52 move away from each other to the set maximum spacing, the two sets of jaws 1 have clamped the workpiece. Because the two sets of limit nuts 62 limit the front and rear positions of the push plate 52 and the cylinder 51, they cannot move further, and accordingly, the two sets of jaws 1 cannot continue to move toward each other. This prevents the two sets of jaws 1 from continuing to move toward each other after they have already clamped the workpiece, causing the workpiece to be flattened or crushed.

[0039] The frame 7 serves as the mounting base for the chuck of this embodiment. The spindle 3 is rotatably mounted on the frame 7. A rotary drive mechanism 8 is provided on the frame 7 and is in driving connection with the spindle 3. When necessary, the rotary drive mechanism 8 drives the spindle 3, the connecting sleeve 4, the synchronous drive mechanism 5, the anti-pinching mechanism 6, the front cover 2, and the four clamping jaws 1 for rotational movement. Ultimately, during operation, the four clamping jaws 1 can rotate together while gripping the workpiece. Both the frame 7 and the rotary drive mechanism 8 are well-established technologies, and their structure and mounting relationship are not described in detail.

[0040] The above embodiments are illustrations of specific implementation methods of the present invention, rather than limitations of the present invention. Technicians in the relevant technical fields can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. A full-stroke laser tube cutting chuck, comprising a frame, a rotary drive mechanism mounted on the frame, a spindle rotatably mounted on the frame and drivingly connected to the rotary drive mechanism, a front cover mounted in front of the spindle, a connecting sleeve fixedly connected to the front cover and the spindle at its front and rear ends, and four clamping jaws, two each positioned in the upper and lower directions and two each in the left and right directions, movably mounted on the front side of the front cover, characterized in that: The cam is fixedly mounted on the front of the cylinder to move the two pairs of jaws in a synchronous manner so as to move the two pairs of jaws in a direction of rotation relative to each other. The cam is fixedly mounted on the front of the cylinder to move the two pairs of jaws in a direction of rotation relative to each other. The cam is fixedly mounted on the front of the cylinder to move the two pairs of jaws in a direction of rotation relative to each other. The cylinder further comprises a cylinder body, a front end cover and a rear end cover, the outer peripheries of the front end cover and the rear end cover of the cylinder protrude outward relative to the cylinder body, and the front end cover and the rear end cover are each provided with four mounting holes extending through the front and rear directions on the protruding outer periphery; the push plate is a plate structure member having an overall circular shape, and the outer periphery of the push plate is provided with four mounting holes extending through the front and rear directions; The front cover includes a body and a pressure plate fixedly arranged on the front side of the body; four mounting slots are provided on the body facing forward, each mounting slot is provided with a driving screw through hole, the pressure plate is provided with four power wedge movable slots in the up-down and left-right directions, and four bearing mounting countersunk holes are provided on the pressure plate and the main shaft; the rotating support bearings fixed on the front and rear ends of the four driving screws are each fixedly arranged in the four bearing mounting countersunk holes of the pressure plate and the main shaft; four shift forks are each movably arranged in the four mounting slots of the front cover body and are transmission-connected to a corresponding power wedge; The shift fork includes a base plate and a shift rod that is integral with or fixedly connected to the base plate and extends forward, and the rear end of the power wedge is provided with a shift rod accommodating groove; the shift fork is fixedly connected to the front end of the driving screw by its base plate, and the shift fork extends into the shift rod accommodating groove of the power wedge to realize transmission connection by its shift rod, and the middle part of each power wedge is slidably arranged in a corresponding power wedge movable groove of the pressure plate of the front cover.

2. The full-stroke laser tube cutting chuck according to claim 1, characterized in that: Each driving screw is equipped with a driving nut, and two of the four driving nuts are fixedly set in two mounting holes opposite to each other in the upper and lower directions or left and right directions of the push plate; the other two of the four driving nuts are fixedly set in two mounting holes opposite to each other in the left and right directions or up and down directions of the front cover or the rear end cover.

3. The full-stroke laser tube cutting chuck according to claim 1, characterized in that: Two of the four drive screws are each equipped with a drive nut, and the two drive nuts are each fixedly set in two mounting holes opposite to each other in the upper and lower directions or left and right directions of the push plate; the other two of the four drive screws are each equipped with two drive nuts, and the four drive nuts are each fixedly set in two mounting holes opposite to each other in the left and right directions or up and down directions of the front end cover and the rear end cover.

4. The full-stroke laser tube cutting chuck according to any one of claims 1 to 3, characterized in that: The driving nut is composed of a single nut, or is composed of two nuts that cooperate with each other.

5. The full-stroke laser tube cutting chuck according to claim 1, characterized in that: It also includes an anti-pinching mechanism, which includes an anti-pinching screw and two sets of limiting nuts that cooperate with the anti-pinching screw thread. The anti-pinching screw can movably pass through the anti-pinching screw through holes on the push plate and the front end cover and rear end cover of the cylinder. The front and rear ends of the anti-pinching screw are fixedly connected to the front cover and the main shaft respectively; one of the two sets of limiting nuts is adjustably arranged on the front side of the push plate on the anti-pinching screw, and the other set of limiting nuts is adjustably arranged on the rear side of the front end cover or the rear side of the rear end cover of the cylinder on the anti-pinching screw.

6. The full-stroke laser tube cutting chuck according to claim 1, characterized in that: The connecting sleeve is a structural member that is hollow cylindrical as a whole. A hollow portion is provided on the wall of the connecting sleeve. The connecting sleeve is equipped with a cover of a cylindrical plate member. The cover is fixed to the outer periphery of the connecting sleeve and closes the hollow portion of the connecting sleeve.

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