Gear synchronous transmission anti-pinch laser pipe cutting chuck

Abstract

The application provides a gear synchronous transmission anti-clamping laser pipe cutting chuck, which comprises a front cover, a rear cover, a connecting shaft for fixedly connecting the front cover and the rear cover, two pairs of clamping claws for clamping a pipe, an actuating cylinder for providing a power source, a synchronous driving mechanism for synchronously transmitting the driving force of the actuating cylinder to the clamping claws, and an anti-clamping mechanism for limiting the stroke of the synchronous driving mechanism and thus limiting the stroke of the clamping claws; the synchronous driving mechanism comprises an ear seat connected with the actuating cylinder, a push rod connected with the ear seat, a synchronous driving gear wheel in transmission connection with the push rod, four driven gear wheels in meshing connection with the synchronous driving gear wheel, one pawl fixedly arranged on each of the driven gear wheels, and four sliders slidably arranged on the front cover; the four pawls are in transmission connection with the four sliders respectively; and one clamping claw is fixedly arranged on each of the sliders. The application has high transmission efficiency and synchronous precision, is suitable for machining pipe fittings with a large size range, and can be effectively used for clamping thin pipes or fragile pipe fittings.

Description

Technical Field

[0001] This invention relates to the field of laser tube cutting auxiliary tools technology, specifically to a gear synchronous transmission anti-pinch laser tube cutting chuck. Background Technology

[0002] When laser cutting pipe fittings, chucks are typically used to clamp and fix the fittings. Existing chucks generally include a front and rear cover as the mounting base, two sets of jaws (two jaws per set, one vertical and one horizontal) for clamping the pipe fitting, an actuating cylinder (also called a power source, usually a pneumatic cylinder) that provides power to the jaws, a transmission mechanism between the actuating cylinder and the two sets of jaws, and a synchronization mechanism to synchronize the movement of the two sets of jaws. Existing chucks vary in transmission method, including rack and pinion chucks, flexible transmission chucks, and shift fork transmission chucks. The synchronization mechanism of existing chucks is generally separate from the drive mechanism. For example, a lightweight pipe-cutting chuck disclosed in Chinese patent document CN106984842B uses a four-bar linkage as the synchronization mechanism. In such chucks, the synchronization mechanism and clamping mechanism are separate, occupying space in the pipe fitting through-hole on the chuck, thus limiting the applicable pipe sizes, resulting in low cost-effectiveness and limited synchronization accuracy. Chinese patent document CN214684838U discloses a fork-type transmission chuck integrating a drive mechanism and a synchronization mechanism. Its cylinder power drives the chuck's movement via the chuck, connecting rod, and slider. Simultaneously, the cylinder power drives a second rotating disk via the chuck and transmission rod, which rotates based on the first rotating disk to achieve synchronized movement between the chucks. The problem is that both the drive and synchronization mechanisms use a slotted pin structure where corresponding slots on the chuck engage with the transmission rod and connecting rod respectively. This results in a relatively complex chuck shape and, due to functional requirements, a high installation position, leading to a long transmission rod and connecting rod, which can cause jamming during use. The chuck suffers from several drawbacks, including stiffness, dead spots, and low synchronization accuracy. Furthermore, the pawl interferes with the second rotating disc (synchronization ring) during operation, limiting the size of the synchronization ring. This restricts the size of the circular hole in the center of the chuck used to hold the workpiece; if a square hole is made, the size must be even smaller. With the external dimensions unchanged, the applicable range of workpiece sizes is relatively small, affecting the chuck's cost-effectiveness. Additionally, the first and second rotating discs, acting as the synchronization mechanism, experience sliding friction with the hollow shaft, resulting in insufficient transmission efficiency. Moreover, to increase the wear resistance of the first rotating disc, it is usually necessary to replace the commonly used aluminum part with a steel part, significantly increasing the chuck's weight.

[0003] Common chucks are typically full-stroke chucks with two sets of jaws that can engage independently. When used to clamp thin or fragile pipes, the stroke of the two jaws is difficult to control. If the clamp is loose, the pipe can easily fall off; if it is tight, the pipe can be flattened or crushed, rendering it unusable. To address this issue, Chinese patent document CN107790904A discloses a drive device and clamping mechanism for the jaws of a laser pipe cutting machine, which can prevent workpiece damage. However, its cylinder and pneumatic system are complex and costly. Chinese patent document CN111618456A discloses an intelligent pneumatic chuck that uses an electrical detection mechanism, including a displacement sensor and a computer board, to prevent the pipe from being flattened or crushed. While it solves the aforementioned problems, its structure is relatively complex, increasing equipment costs. Furthermore, the chuck vibrates significantly during use in a harsh working environment, which can easily interfere with the electrical components and affect the reliability of the detection mechanism. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a gear synchronous transmission anti-pinch laser tube cutting chuck that has high transmission efficiency and synchronization accuracy, is applicable to a wide range of processed tube sizes under the premise of the same external dimensions, and can be effectively used to clamp thin or fragile tubes.

[0005] The technical solution of the present invention is as follows: The gear synchronous transmission anti-pinch laser tube cutting chuck of the present invention includes a front cover and a rear cover as a mounting base, a connecting shaft that fixes the front cover and the rear cover together, a pair of vertical jaws and a pair of horizontal jaws for clamping tubes during use, and an actuating cylinder for providing the power source for the movement of the jaws. Its structural features are: it also includes a synchronous drive mechanism including a synchronous drive gear and four driven gears for synchronously transmitting the driving force of the actuating cylinder to the jaws, and an anti-pinch mechanism for limiting the stroke of the synchronous drive mechanism and thus correspondingly limiting the stroke of the jaws.

[0006] A further embodiment is as follows: the aforementioned synchronous drive mechanism further includes an ear seat fixedly connected to the outer end of the piston rod of the aforementioned actuating cylinder, a push rod fixedly connected to the aforementioned ear seat, a pawl fixedly disposed on each driven gear, and four sliders slidably disposed on the aforementioned front cover; the aforementioned four driven gears are rotatably disposed on the aforementioned connecting shaft and all mesh with the aforementioned synchronous drive gear, the aforementioned push rod is drivingly connected to the synchronous drive gear; each of the four pawls is drivingly connected to one slider; and one pawl is fixedly disposed on each slider.

[0007] A further embodiment is as follows: the aforementioned synchronous drive gear includes an annular body and two or more connecting ears that are integrally or fixedly connected to the body and protrude outwards. The outer circumference of the body is provided with four segments of transmission teeth at intervals, and the connecting ears are provided with connecting holes. The synchronous drive gear is sleeved with the aforementioned push rod through the connecting holes of its connecting ears. The synchronous drive gear meshes with one driven gear through each of its four segments of transmission teeth.

[0008] A further embodiment is as follows: the aforementioned pawl includes a lever arm and a lever located at the inner end of the lever arm and extending forward. The pawl is fixed to the driven gear by the outer side of its lever arm and can rotate with the driven gear. Each pawl is connected to a slider by its lever arm.

[0009] A further solution is as follows: four grooves are evenly spaced on the front cover, each groove has a slide rail on both sides, and each groove has a lever through hole; one slider is set in each of the four grooves of the front cover and is slidably connected to the corresponding slide rail; the outer rear end of the slider has a forward-recessed lever receiving groove, and the lever of the pawl passes through the lever through hole of the front cover and is inserted into the lever receiving groove of the slider.

[0010] A further embodiment is as follows: the aforementioned synchronous drive mechanism further includes three or more sets of rotary support bearing assemblies fixedly disposed on the rear end face of the aforementioned front cover and located inside the body of the aforementioned synchronous drive gear. The aforementioned rotary support bearing assembly includes a spindle fixedly disposed on the rear end face of the front cover, a bearing sleeved with the spindle and capable of rotating by the spindle, and a pressure cap fixedly disposed on the rear end face of the front cover and located at the rear end of the body of the synchronous drive gear to limit the synchronous drive gear; the outer ring of the bearing is in contact with the inner side of the body of the synchronous drive gear.

[0011] A further embodiment is as follows: the aforementioned anti-pinch mechanism includes a left mounting base and a right mounting base arranged in a mirror image of each other, a screw rod rotatably mounted on the left mounting base and the right mounting base respectively, a linear guide rail fixedly connected to the left mounting base and the right mounting base respectively, a sliding block slidably mounted on the linear guide rail, a limiting member fixedly connected to the sliding block and threadedly connected to the screw rod, and a screw locking block fixedly connected to the left mounting base or the right mounting base to lock the screw rod when the limiting member is adjusted and moved to a set position on the screw rod during use; the number of anti-pinch mechanisms is not greater than the number of the aforementioned actuating cylinders.

[0012] A further solution is: two or four actuating cylinders are fixedly installed on the rear end face of the front cover, and two or four anti-pinch mechanisms are fixedly installed on the front end face of the rear cover at the positions corresponding to the actuating cylinders. Each anti-pinch mechanism has its limiting component rigidly limiting the stroke of the ear seat of the synchronous drive mechanism.

[0013] A further solution is as follows: the limiting member of the above-mentioned anti-pinch mechanism is composed of a connecting part and a limiting block provided on the connecting part, which are integrally or fixedly connected; the connecting part is provided with a threaded through hole; the limiting member is connected to the above-mentioned screw threadedly through the threaded through hole of its connecting part, and the limiting member is fixedly connected to the above-mentioned sliding block through its connecting part; the limiting member rigidly limits the stroke of the ear seat of the above-mentioned synchronous drive mechanism through its limiting block.

[0014] A further option is to provide a pipe fitting receiving hole in the middle of the aforementioned front cover, which can be either a square hole or a round hole.

[0015] The present invention has the following positive effects: (1) The present invention, through the overall structural design of the synchronous drive mechanism including a large annular synchronous drive gear driving four driven gears, makes it smoother and more efficient in operation than similar mechanisms in the prior art. Moreover, one set of synchronous drive mechanism enables two sets of four jaws to work in precise synchronization, and the synchronization accuracy is significantly improved compared with the prior art. (2) Through the overall structural design of the synchronous drive mechanism, compared with similar chucks in the prior art, under the premise that the outer dimensions of the chuck remain unchanged, when the pipe fitting receiving hole of the present invention is made into a square hole, the opposite side dimension of the square hole can be larger than the diameter of the round hole in the prior art. If the pipe fitting receiving hole is made into a round hole, the diameter is significantly larger than that of the round hole in the prior art. Thus, under the premise of the same outer dimensions, the applicable range of pipe fitting sizes is significantly increased, which significantly improves the cost performance of the chuck of the present invention. (3) The anti-flattening mechanism designed in this invention is easy to install on the chuck through its overall structural design. During use, the position of the limiting component can be easily adjusted by rotating the screw. After the limiting component is adjusted to the set position, the limiting block of the limiting component limits the travel of the transmission mechanism during operation, thereby limiting the travel of the two sets of jaws of the chuck. While ensuring that the two sets of jaws clamp the pipe being processed, they cannot continue to move relative to each other, thus ensuring that the thin-walled or fragile pipe being processed will not be flattened, deformed, or crushed while being clamped. (4) The anti-flattening mechanism of this invention has a simple overall structure, low cost, and adopts a purely mechanical structure, which is suitable for the harsh working environment of the chuck and has high reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the front cover structure;

[0018] Figure 3 To remove Figure 1 A schematic diagram of the structure of an embodiment of the present invention is shown below, including the rear cover, front cover, and locking claws.

[0019] Figure 4 for Figure 3 A schematic diagram of the synchronous drive gear and rotating support bearing assembly of the intermediate synchronous drive mechanism;

[0020] Figure 5 From Figure 4 A schematic diagram of the structure when viewed from the rear;

[0021] Figure 6 for Figure 3 Schematic diagram of the anti-flattening mechanism;

[0022] Figure 7 To and Figure 6 Schematic diagram of the anti-pinch mechanism when viewed from different directions;

[0023] Figure 8 To remove Figure 1 The diagram shows the structure of another embodiment of the present invention as seen from the rear cover.

[0024] The reference numerals in the above figures are as follows:

[0025] 1. Claw 1, vertical claw 11, horizontal claw 12; 2. Front cover 2, pipe fitting receiving hole 21, slide groove 22, slide rail 23, lever through hole 24; 3. Connecting shaft 3; 4. Rear cover 4; 5. Actuating cylinder 5, mounting post 51;

[0026] Synchronous drive mechanism 6, ear seat 61, push rod 62, synchronous drive gear 63, body 63-1, transmission gear 63-1-1, connecting ear 63-2, connecting hole 63-2-1, rotary support bearing assembly 64, spindle 64-1, bearing 64-2, pressure cap 64-3, driven gear 65, pawl 66, actuating arm 66-1, lever 66-2, slider 67, lever receiving groove 67-1;

[0027] Anti-pinch mechanism 7, left mounting base 71, right mounting base 72, screw 73, linear guide rail 74, sliding block 75, limiting component 76, connecting part 76-1, limiting block 76-2, screw locking block 77, locking screw 77-1. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] (Example 1)

[0030] In this embodiment, when describing the orientation, it uses... Figure 1 The direction being faced is the front as described, with the back to the front. Figure 1 The direction it faces is the rear, as described. Figure 1 The up-down and left-right directions in the text are still the same as those in the description.

[0031] See Figures 1 to 3 The gear synchronous transmission anti-pinch laser tube cutting chuck of this embodiment mainly consists of a chuck 1, a front cover 2, a connecting shaft 3, a rear cover 4, an actuating cylinder 5, a synchronous drive mechanism 6, and an anti-pinch mechanism 7.

[0032] The chuck 1 can be a roller-type or non-roller-type chuck from the prior art. The chuck 1 includes two vertical chucks 11 and two horizontal chucks 12; the chuck 1 is prior art, and its structure will not be described in detail.

[0033] See Figure 2 The front cover 2 is a disc-shaped structure with a through-hole 21 for accommodating a pipe in the center. This hole can be square or round; in this embodiment, a square hole is used. The front cover 2 has four grooves 22 arranged vertically and horizontally, with slide rails 23 on both sides of each groove 22. In this embodiment, each groove 22 has a lever passage hole 24, which is preferably an arc-shaped through hole. The rear cover 4 is also a disc-shaped structure, with an outer perimeter approximately the same size as the front cover 2.

[0034] See Figure 3 The connecting shaft 3 is a cylindrical structural component, and there are four connecting shafts 3. The front and rear ends of the four connecting shafts 3 are fixedly connected to the front cover 2 and the rear cover 4 respectively, thereby assembling the front cover 2 and the rear cover 4 together. The actuating cylinder 5 serves as the power source for driving the movement of the chuck 1. The actuating cylinder 5 can be a pneumatic cylinder or a hydraulic cylinder. In this embodiment, the actuating cylinder 5 is preferably a pneumatic cylinder. In this embodiment, two actuating cylinders 5 are provided, and the two actuating cylinders 5 are fixedly mounted on the rear end face of the front cover 2 by the provided mounting posts 51.

[0035] Still see Figure 3 The synchronous drive mechanism 6 is used to synchronously transmit the power output from the actuating cylinder 5 to the four chucks 1 to drive the four chucks 1 to move synchronously. The synchronous drive mechanism 6 includes a lug 61, a push rod 62, a synchronous drive gear 63, a rotary support bearing assembly 64, a driven gear 65, a chuck 66, and a slider 67. The lug 61 is fixedly connected to the outer end of the piston rod of the actuating cylinder 5, and the push rod 62 is fixedly connected to the lug 61. Each actuating cylinder 5 is equipped with one set of lug 61 and push rod 62.

[0036] See Figure 4 and Figure 5The synchronous drive gear 63 includes an annular body 63-1 and two or more connecting ears 63-2 that are integrally or fixedly connected to the body 63-1 and protrude outward. The outer periphery of the body 63-1 is provided with transmission teeth 63-1-1. Preferably, the transmission teeth 63-1-1 are arranged in four segments at intervals on the outer periphery of the body 63-1. The connecting ears 63-2 are provided with connecting holes 63-2-1. The synchronous drive gear 63 is sleeved with the push rod 62 through the connecting holes 63-2-1 of its connecting ears 63-2. The rotary support bearing assembly 64 is preferably configured to facilitate smoother rotation of the synchronous drive gear 63. The rotary support bearing assembly 64 includes a spindle 64-1 fixedly mounted on the rear end face of the front cover 2, a bearing 64-2 sleeved with and rotatable on the spindle 64-1, and a pressure cap 64-3 fixedly mounted on the rear end face of the front cover 2 and located at the rear end of the synchronous drive gear 63 body 63-1 to limit the movement of the synchronous drive gear 63. The outer ring of the bearing 64-2 contacts the inner side of the synchronous drive gear 63 body 63-1. Three or more sets of the rotary support bearing assemblies 64 are evenly spaced; in this embodiment, eight sets are provided. The synchronous drive gear 63, driven by the actuating cylinder 5 via the lug 61 and push rod 62, can rotate relative to each rotary support bearing assembly 64.

[0037] Still see Figure 3 One driven gear 65 is rotatably mounted on each of the four connecting shafts 4 and located on the front side of the connecting shaft 3. One pawl 66 is fixedly mounted on each driven gear 65 and located on the front side of the driven gear 65. One slider 67 is set in each of the four sliding grooves 22 of the front cover 2 and is slidably connected to the corresponding slide rail 23. The pawl 66 includes a toggle arm 66-1 and a lever 66-2 located at the inner end of the toggle arm 66-1 and extending forward. The pawl 66 is fixedly mounted on the driven gear 65 by the outside of its toggle arm 66-1 and can rotate with the driven gear 65. The outer rear end of the slider 67 has a forward-recessed lever receiving groove 67-1. The lever 66-2 of the pawl 66 passes through the lever through hole 24 of the front cover 2 and is inserted into the lever receiving groove 67-1 of the slider 67. The aforementioned four pawls 1 are fixedly mounted on the front end face of each of the four sliders 65.

[0038] See Figure 6 and Figure 7 The anti-pinch mechanism 7 mainly consists of a left mounting base 71, a right mounting base 72, a screw 73, a linear guide rail 74, a sliding block 75, a limiting component 76, and a screw locking block 77.

[0039] The left mounting base 71 and the right mounting base 72 have identical structures and are arranged in a mirror image of each other. The screw 73 is a rod-shaped component with heads at both ends and external threads in the middle section; both ends of the screw 73 are rotatably mounted on the left mounting base 71 and the right mounting base 72. The left and right ends of the linear guide rail 74 are fixedly connected to the left mounting base 71 and the right mounting base 72 respectively, and the lower end face of the linear guide rail 74 is flush with the lower end faces of the left mounting base 71 and the right mounting base 72. The sliding block 75 is a block-shaped structural component that mates with the linear guide rail 74; the sliding block 75 is slidably mounted on the linear guide rail 74. The limiting member 76 mainly consists of a connecting part 76-1 and a limiting block 76-2 provided on the connecting part 76-1, either integrally or fixedly connected. The connecting part 76-1 has a threaded through hole; the limiting member 76 is threadedly connected to the screw 73 through the threaded through hole of its connecting part 76-1, and the limiting member 76 is fixedly connected to the sliding block 75 through its connecting part 76-1. During use, rotating the screw 73 with a wrench allows the limiting member 76, which is threadedly connected to the screw 73, to move and adjust its position. The sliding block 75, which is fixedly connected to the limiting member 76, moves synchronously with the limiting member 76 on the linear guide rail 74, guiding and supporting the movement of the limiting member 76. The screw locking block 77 is used to lock the screw 73 after the limiting member 76 is adjusted to the correct position, preventing the limiting member 76 from shifting due to vibration during use.

[0040] Still see Figure 3 The number of anti-pinch mechanisms 7 is no greater than the number of actuating cylinders 5. In this embodiment, the number of anti-pinch mechanisms 7 can be one set or two sets, preferably two sets. Two sets of anti-pinch mechanisms 7 are fixedly mounted on the rear cover 4 and positioned to cooperate with the actuating cylinders 5 fixedly mounted on the rear end face of the front cover 2. In use, the anti-pinch mechanism 7 uses its limiting block 76-2 of the limiting member 76 to limit the stroke of the lug 61 of the synchronous drive mechanism 6, which is fixedly connected to the piston rod of the actuating cylinder 5. This limits the stroke of the two vertical jaws 11 and two horizontal jaws 12 driven by the synchronous drive mechanism 6 of the actuating cylinder 5, thereby achieving the purpose of preventing the processed pipe fitting from being flattened or crushed. Before use, based on the outer circumference dimensions of the thin or fragile pipe fitting being processed and existing industry experience, the position of the limiting member 76 is adjusted to the set value, and then the screw 73 is locked using the screw locking block 77.

[0041] The working principle and process of the gear synchronous transmission anti-pinch laser tube cutting chuck in this embodiment are briefly described below.

[0042] When two actuating cylinders 5 (taking a pneumatic cylinder as an example) are simultaneously intake, the piston rods of each actuating cylinder 5 extend outwards. Through the lug 61 and push rod 62 of the synchronous drive mechanism 6, they drive the synchronous drive gear 63 to rotate, relying on each rotary support bearing assembly 64. The rotation of the synchronous drive gear 64 synchronously drives the four driven gears 65 to rotate, and causes the pawls 66 fixed on the driven gears 65 to rotate synchronously. The lever 66-2 of the pawl 66 rotates in an arc shape within the lever through hole 24 of the front cover 2. Through the cooperation of the lever receiving groove 67-1 of the slider 67, each slider 67 synchronously relies on the corresponding slide rail 2 of the front cover 2. 3. The synchronous drive mechanism 6 performs a centripetal linear motion, causing the two vertical jaws 11 and two horizontal jaws 12 fixed on each slider 67 to perform a synchronous centripetal clamping motion. When the lug 61 of the synchronous drive mechanism 6 moves to abut against the limiting block 76-2 of the limiting member 76 of the anti-flattening mechanism 7, the two vertical jaws 11 and two horizontal jaws 12 have clamped the pipe to be processed. Due to the rigid limitation of the stroke of the two lugs 61 by the two anti-flattening mechanisms 7, the two vertical jaws 11 and two horizontal jaws 12 cannot continue to move centripetally, thereby achieving the purpose of preventing the pipe to be processed from being flattened or crushed. When the two actuating cylinders 5 release air synchronously, the synchronous drive mechanism 6 performs the opposite action to that when the actuating cylinders 5 are inlet, causing the two vertical jaws 11 and two horizontal jaws 12 to perform a synchronous back-to-back motion away from the center, thereby releasing the pipe to be processed.

[0043] (Example 2)

[0044] See Figure 8 The gear-synchronous transmission anti-pinch laser tube cutting chuck of this embodiment is the same as that of Embodiment 1 in other aspects, except that: in this embodiment, four actuating cylinders 5 are provided, four lugs 61 and four push rods 62 are provided in the synchronous drive mechanism 6, and two or four sets of anti-pinch mechanisms 7 are provided, preferably four sets. Compared with Embodiment 1, the power of a single actuating cylinder 5 in this embodiment is less than that in Embodiment 1, and the rotation of the synchronous drive gear 63 is more stable and smooth. The addition of two sets of anti-pinch mechanisms 7 makes the stroke limit of the chuck 1 more reliable.

[0045] The above embodiments are descriptions of specific implementations of the present invention, and not limitations thereof. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. A gear-synchronized transmission anti-pinch laser tube cutting chuck, comprising a front cover and a rear cover as a mounting base, a connecting shaft for fixing the front cover and the rear cover together, a pair of vertical jaws and a pair of horizontal jaws for clamping tubes during use, and an actuating cylinder for providing power to the jaws for movement, characterized in that: It also includes a synchronous drive mechanism comprising a synchronous drive gear and four driven gears for synchronously transmitting the driving force of the actuating cylinder to the chuck, and an anti-pinch mechanism for limiting the stroke of the synchronous drive mechanism and thus correspondingly limiting the stroke of the chuck. The synchronous drive mechanism further includes an ear seat fixedly connected to the outer end of the piston rod of the actuating cylinder, a push rod fixedly connected to the ear seat, a pawl fixedly disposed on each driven gear, and four sliders slidably disposed on the front cover; the four driven gears are rotatably disposed on the connecting shaft and all mesh with the synchronous drive gear, the push rod is drivenly connected to the synchronous drive gear; each of the four pawls is drivenly connected to one slider; and one pawl is fixedly disposed on each slider. The synchronous drive gear includes a circular body and two or more connecting ears that are integrally or fixedly connected to the body and protrude outward. The outer circumference of the body is provided with four segments of transmission teeth, and the connecting ears are provided with connecting holes. The synchronous drive gear is sleeved with the push rod through the connecting holes of its connecting ears. Each of the four segments of transmission teeth of the synchronous drive gear meshes with one driven gear. The pawl includes a lever arm and a lever located at the inner end of the lever arm and extending forward. The pawl is fixed to the driven gear by the outer side of its lever arm and can rotate with the driven gear. Each pawl is connected to a slider by its lever arm. The anti-pinch mechanism includes a left mounting base and a right mounting base arranged in mirror image of each other, a screw rod rotatably mounted on the left mounting base and the right mounting base respectively, a linear guide rail fixedly connected to the left mounting base and the right mounting base respectively, a sliding block slidably mounted on the linear guide rail, a limiting member fixedly connected to the sliding block and threadedly connected to the screw rod, and a screw locking block fixedly connected to the left mounting base or the right mounting base to lock the screw rod when the limiting member is adjusted and moved to a set position on the screw rod during use; the number of anti-pinch mechanisms is not greater than the number of actuating cylinders.

2. The gear synchronous transmission anti-pinch laser tube cutting chuck according to claim 1, characterized in that: The front cover has four evenly spaced grooves, each groove has a slide rail on both sides, and each groove has a lever through hole. The slider is set in one of the four grooves of the front cover and is slidably connected to the corresponding slide rail. The outer rear end of the slider has a forward-recessed lever receiving groove. The lever of the pawl passes through the lever through hole of the front cover and is inserted into the lever receiving groove of the slider.

3. The gear synchronous transmission anti-pinch laser tube cutting chuck according to claim 1 or 2, characterized in that: The synchronous drive mechanism further includes three or more sets of rotary support bearing assemblies fixedly disposed on the rear end face of the front cover and located inside the body of the synchronous drive gear. The rotary support bearing assembly includes a spindle fixedly disposed on the rear end face of the front cover, a bearing sleeved with the spindle and capable of rotating by the spindle, and a pressure cap fixedly disposed on the rear end face of the front cover and located at the rear end of the body of the synchronous drive gear to limit the synchronous drive gear; the outer ring of the bearing is in contact with the inner side of the body of the synchronous drive gear.

4. The gear synchronous transmission anti-pinch laser tube cutting chuck according to claim 1, characterized in that: Two or four actuating cylinders are fixedly installed on the rear end face of the front cover. Two or four anti-pinch mechanisms are fixedly installed on the front end face of the rear cover at the positions corresponding to the actuating cylinders. Each anti-pinch mechanism uses its limiting component to rigidly limit the stroke of the ear seat of the synchronous drive mechanism.

5. The gear synchronous transmission anti-pinch laser tube cutting chuck according to claim 4, characterized in that: The limiting component of the anti-pinch mechanism is composed of a connecting part and a limiting block provided on the connecting part, which are integrally or fixedly connected; the connecting part is provided with a threaded through hole; the limiting component is connected to the screw threaded through hole of its connecting part, and the limiting component is fixedly connected to the sliding block by its connecting part; the limiting component rigidly limits the stroke of the ear seat of the synchronous drive mechanism by its limiting block.

6. The gear synchronous transmission anti-pinch laser tube cutting chuck according to claim 1, characterized in that: The front cover has a pipe receiving hole in the middle, which can be square or round.

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