Anti-pinching collet with adjustable jaw stroke

Abstract

The present invention provides an anti-pinching collet with adjustable jaw stroke, comprising a frame, a rotary drive assembly arranged on the frame, a rotatable mounting plate driven by the rotary drive assembly, a pair of jaws arranged in upper and lower parts and left and right parts, a jaw drive assembly arranged on the mounting plate, a stroke adjustment and anti-pinching assembly arranged on the mounting plate for adjusting and limiting the strokes of the two pairs of jaws during operation and preventing the two pairs of jaws from pinching a workpiece, the jaw drive assembly comprising a slider provided with a limit arm, the slider and the jaws each being provided with teeth that cooperate with each other, and the mounting position of the jaws on the slider being adjustable, the stroke adjustment and anti-pinching assembly comprising a stroke adjustment limit block and an anti-pinching limit block arranged at intervals, the limit arm of the slider being movably arranged in the interval between the stroke adjustment limit block and the anti-pinching limit block. The present invention is applicable to a wide range of sizes of workpieces to be processed and has strong applicability, can prevent workpieces from being pinched, has high clamping efficiency, and saves energy.

Description

Technical Field

[0001] The invention relates to the technical field of laser tube cutting and clamping tools, and in particular to an anti-pinching collet with adjustable clamping jaw stroke. Background Art

[0002] A collet is a device used to clamp workpieces such as shafts and tubes during machining, and is also widely used in laser tube cutting production lines. Currently, there are two main types of collets. One type uses an elastic cylindrical clamping member that uses a matching elastic cylindrical clamping member to squeeze the workpiece. For example, Chinese patent publication No. CN216398862U discloses a pneumatic collet for cylindrical workpieces. The collet comprises a cover plate, a piston plate, an elastic collet (actually, an elastic chuck), and a collet seat. During operation, the sliding of the piston plate drives the collet. As the collet moves toward the cover plate, the tapered surfaces between the collet and the collet seat cooperate to squeeze and contract the collet, thereby clamping the workpiece. Another example is Chinese patent publication No. CN214816851U, which discloses a collet spindle clamping seat. This collet also uses a clamping mechanism similar to the aforementioned collet: an elastic collet and a telescopic sleeve. When this type of collet is used, the size of the workpiece that can be clamped remains basically unchanged. That is, it is used for a single workpiece, and the size of the applicable workpiece is severely limited, and its versatility is poor. If it is needed to clamp workpieces of different sizes, collets of different sizes are required, resulting in the need for more production equipment and high costs. Another common type of collet currently used is a collet-type chuck with slidable jaws on a slider to clamp the workpiece to be processed. For example, the Chinese patent document with application publication number CN216398862U discloses a collet-type chuck for a laser tube cutting machine, which achieves clamping and loosening of the workpiece by sliding the jaws on the chuck seat. Compared with the aforementioned elastic collet, its dimensional applicability to the workpiece is enhanced but it is still limited. After the jaws are fixed and installed, the total stroke cannot be changed and it does not have a stroke adjustment function. Each time the jaws perform a clamping and loosening action, they need to perform a full-stroke movement on their chuck seat, which affects the clamping efficiency and wastes energy. In addition, the overall structure of the collet-type chuck for the laser tube cutting machine is complex, and the transmission mechanism between the jaw driving force and the jaws is unclear.

[0003] Furthermore, the two common types of collets mentioned above do not have a mechanism to prevent the workpiece from being flattened or crushed. When they are used to clamp thin-walled tubes or fragile pipes, the pipes are likely to come loose if the clamping is loose, and the workpieces are likely to be flattened or crushed if the clamping is tight.

[0004] Therefore, in view of the above-mentioned problems existing in the existing collets, continuing to develop new and more suitable collets is a technical issue of interest to technical personnel in the industry. Summary of the Invention

[0005] The purpose of the present invention is to provide a collet with adjustable jaw stroke to prevent flattening in order to solve the technical problems of the collet in the prior art, such as limited applicable workpiece size and easy flattening of the workpiece during use.

[0006] The technical solution of the present invention is: the anti-pinching collet with adjustable jaw stroke of the present invention includes a frame, a rotating drive assembly arranged on the above-mentioned frame, a rotatable mounting disk driven by the above-mentioned rotating drive assembly, a pair of jaws arranged in the upper and lower directions and the left and right directions, and a jaw driving assembly arranged on the above-mentioned mounting disk for driving the above-mentioned two pairs of jaws to move. Its structural feature is: it also includes a stroke adjustment and anti-pinching assembly arranged on the above-mentioned mounting disk for adjusting and limiting the stroke of the two pairs of jaws during work through the above-mentioned jaw driving assembly and preventing the two pairs of jaws from pinching the workpiece.

[0007] A further solution is: the above-mentioned mounting plate includes a main body and an installation connecting ring, a center hole is provided in the middle of the above-mentioned main body, and four guide rail mounting grooves are provided on the front end surface of the main body in the up and down directions and the front and back directions. The installation connecting ring is provided on the rear end periphery of the center hole of the main body and is integrated with or fixedly connected to the main body.

[0008] A further solution is: the above-mentioned jaw drive assembly includes two cylinders fixedly mounted on the above-mentioned mounting plate body, a swivel movably mounted on the mounting connecting ring of the above-mentioned mounting plate and driven by the above-mentioned two cylinders, a linear guide rail fixedly mounted in each of the four guide rail mounting grooves of the body of the above-mentioned mounting plate, and a slider each slidingly engaged with a linear guide rail and driven by the swivel.

[0009] A further solution is: four arc-shaped slots for transmission are evenly spaced on the above-mentioned swivel, and the above-mentioned two cylinders are each fixed on the above-mentioned mounting plate through a cylinder mounting column, and the two cylinders are each connected to the swivel through a push rod to drive the swivel to rotate.

[0010] A further solution is: a clamping claw engaging tooth is provided on the front end surface of the above-mentioned slider, a sliding groove is provided in the middle of the rear end of the slider, which is sleeved and slidably matched with the linear guide rail, and a driving shaft is provided below the rear end of the slider, which extends backward and passes through the above-mentioned mounting plate, and a transmission bearing is rotatably provided in an arc-shaped slot hole of the above-mentioned swivel and fixedly connected to the rear end of the driving shaft; a group of clamping claw mounting screw holes are provided on the slider.

[0011] A further solution is: a docking tooth is provided on the rear end face of the above-mentioned clamping jaw, a bolt receiving slot is provided on the clamping jaw, and two or more position-adjustable mounting bolts are provided in the bolt receiving slot; according to the size of the diameter of the clamped workpiece, the docking teeth of each of the four clamping jaws are meshed with the matching teeth of the clamping jaw of a slider, and the four clamping jaws are fixedly connected to the corresponding slider by matching the position-adjustable mounting bolts in the bolt receiving slot of the clamping jaw with the clamping jaw mounting screw holes at corresponding positions in a group of clamping jaw mounting screw holes of the slider.

[0012] A further solution is that a scale pointer is fixedly provided on the clamping jaw, and a diameter size scale of the clamped workpiece matching the scale pointer is provided on the front end surface of the slider.

[0013] A further solution is: a limit block is provided on the above-mentioned slider, and the above-mentioned limit block is provided with a protruding limit arm; the above-mentioned stroke adjustment and anti-pinching limit block includes a base, a stroke adjustment limit block and an anti-pinching limit block which are fixedly arranged on the above-mentioned base and can be adjusted in position, and the anti-pinching limit block and the stroke adjustment limit block are spaced apart on the inner and outer sides of the base; the stroke adjustment and anti-pinching limit block are provided with four sets, each set of stroke adjustment and anti-pinching components is fixed on the mounting plate by its base and cooperates with the position of a slider, and the limit arm of the limit block of each slider can be movably arranged in the interval between the stroke adjustment limit block and the anti-pinching limit block of the stroke adjustment and anti-pinching assembly at the corresponding position.

[0014] A further solution is: the above-mentioned anti-pinching collet with adjustable jaw stroke also includes a cylinder air distribution device provided on the above-mentioned frame for the air inlet and outlet of the above-mentioned two cylinders, a dust cover is fixedly installed on the above-mentioned frame, and the above-mentioned rotary drive assembly includes a reducer, a driving gear connected to the reducer, a driven gear meshing with the driving gear, and a connecting sleeve whose rear end is fixedly connected to the driven gear and whose front end is fixedly connected to the mounting connecting ring of the above-mentioned mounting plate.

[0015] A further solution is that the above-mentioned anti-pinching collet with adjustable jaw stroke is provided with a through hole for accommodating the clamped workpiece along the axis.

[0016] The present invention has positive effects:

[0017] (1) The present invention has a design including the structures of the clamping jaws and the slider and an assembly structure with adjustable positions between them. Compared with the collet of the same type in the prior art, the size range of the workpieces applicable to the present invention is greatly increased, and the applicability is greatly improved, thereby effectively saving the equipment cost of production.

[0018] (2) When the present invention is used to change a workpiece from one size to another, the clamping jaw scale pointer is matched with the clamped workpiece diameter size scale of the slider according to the size of the workpiece, and then the teeth of the clamping jaw and the slider are engaged with each other, and then the bolt position is adjusted and tightened. The adjustment of workpieces of different sizes is convenient and fast, saving time and effort.

[0019] (3) The present invention is provided with a stroke adjustment and anti-pinching component, and a limit arm and other structural designs that cooperate with it are provided on the slider. During use, on the one hand, the slider only needs to drive the clamping jaws to clamp and release the workpiece with a relatively small stroke. Compared with the full-stroke movement of the clamping jaws of the existing similar collet on the sliding member to clamp and release the workpiece, the clamping speed and efficiency of the present invention are greatly improved, and the driving energy can be effectively saved. On the other hand, by limiting the movement of the clamping jaws to clamp the workpiece, the problem of the workpiece being easily flattened or crushed by the existing similar collet can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the present invention;

[0021] Figure 2 for Figure 1 AA sectional view;

[0022] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 4 For the Figure 3 Schematic diagram of the overall three-dimensional structure of the present invention when viewed from different directions;

[0024] Figure 5 To remove Figure 3 Schematic diagram of the three-dimensional structure behind the dust cover;

[0025] Figure 6 For the Figure 5 Schematic diagram of the three-dimensional structure when observed from different directions;

[0026] Figure 7 For the Figure 5 and Figure 6 Schematic diagram of the three-dimensional structure when observed from different directions;

[0027] Figure 8 An exploded schematic diagram of a pair of left and right gripping jaws and a gripping jaw drive assembly of the present invention;

[0028] Figure 9 It is a schematic diagram of the three-dimensional structure of the slider of the present invention.

[0029] The reference numerals in the above drawings are as follows:

[0030] Mounting plate 1, body 11, center hole 11-1, guide rail mounting groove 11-2, cylinder mounting hole 11-3, slider drive shaft through hole 11-4, mounting connecting ring 12, mounting fixing screw hole 12-1;

[0031] Clamping jaw 2, docking teeth 21, bolt receiving slot 22, mounting bolt 23, scale pointer 24;

[0032] Gripper drive assembly 3, slider 31, gripper teeth 31-1, slide 31-2, drive shaft 31-3, transmission bearing 31-4, limit block 31-5, limit arm 31-5-1, gripper mounting screw hole 31-6, clamped workpiece diameter scale 31-7; linear guide 32; swivel 33, intermediate socket hole 33-1, arc-shaped slot 33-2; cylinder 34, cylinder mounting column 34-1; push rod 34-2;

[0033] Stroke adjustment and anti-pinching component 4, base 41, stroke adjustment limit block 42, anti-pinching limit block 43;

[0034] Frame 6, dust cover 61;

[0035] Rotation drive assembly 7, reducer 71, driving gear 72, driven gear 73, connecting sleeve 74;

[0036] Cylinder gas distribution device 8, gas distribution fixed outer ring 81, gas distribution rotating inner ring 82, gas distribution seal 83;

[0037] The clamped workpiece receives the through hole 9 . DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] (Example 1)

[0040] In this embodiment, when describing the position, Figure 1 The direction is the front in the description, with the back facing Figure 1 The direction is the rear in the description. Figure 1 The up, down, left, and right directions in the description remain the up, down, left, and right directions in the description.

[0041] See Figures 1 to 9 The anti-pinching collet with adjustable jaw stroke of this embodiment is mainly composed of a mounting plate 1, a jaw 2, a jaw drive assembly 3, a stroke adjustment and anti-pinching assembly 4, a frame 6, a rotation drive assembly 7 and a cylinder gas distribution device 8.

[0042] See also Figure 1 and Figure 8The mounting plate 1 is mainly composed of a body 11 and a mounting connection ring 12. The body 11 is a structural member with an overall circular shape. A center hole 11-1 is provided in the middle of the body 11. Four guide rail mounting grooves 11-2 are evenly spaced on the front surface of the body 11, with two each in the vertical direction and the left and right direction. The body 11 is provided with two cylinder mounting holes 11-3 and four slider drive shaft passage holes 11-4. The mounting connection ring 12 is a circular structural member with a plurality of mounting screw holes 12-1 provided on the mounting connection ring 12. The mounting connection ring 12 is provided on the outer periphery of the rear end of the center hole 11-1 of the body 11 and is integrally connected to or fixedly connected to the body 11. The mounting connection ring 12 is used to connect to the rotation drive assembly 7 so that the mounting plate 1 can rotate when it needs to rotate during use.

[0043] The overall shape of the clamping jaw 2 is essentially the same as that of the prior art. However, this embodiment differs from the prior art in that abutting teeth 21 are provided on the rear end surface of the clamping jaw 2. The clamping jaw 2 is provided with an elongated bolt-receiving slot 22, which is fitted with two or more mounting bolts 23 with adjustable positions. Preferably, a graduated pointer 24 is also fixed to the clamping jaw 2. Four clamping jaws 2 are provided, each having the same structure.

[0044] The clamping jaw driving assembly 3 includes a slider 31 , a linear guide rail 32 , a swivel 33 and a cylinder 34 .

[0045] See also Figure 8 and Figure 9 The front end of the slider 31 is provided with jaw engaging teeth 31-1 that mate with the engaging teeth 21 of the clamping jaw 2. A slot 31-2 for the linear guide 32 is located in the middle of the rear end of the slider 31. A drive shaft 31-3 extends rearwardly below the rear end of the slider 31. During assembly, a transmission bearing 31-4 is fixed to the rear end of the drive shaft 31-3. The slider 31 is provided with a stopper 31-5, which is equipped with an extended stopper arm 31-5-1. The slider 31 is also provided with a set of jaw mounting screw holes 31-6. A scale 31-7 for the diameter of the clamped workpiece is provided on the front end of the slider 31 to mate with the scale pointer 24 preferably provided on the clamping jaw 2. The slider 31 is provided with four identically structured sliders.

[0046] Four linear guide rails 32 are provided. The swivel 33 is an overall annular structural member with a central socket hole 33-1 defined in the center. Four arcuate slots 33-2 for transmission are evenly spaced throughout the ring body. Two cylinders 34 are provided, each equipped with a cylinder mounting post 34-1 and a push rod 34-2.

[0047] Still see Figures 1 to 8 The assembly relationship of the aforementioned mounting plate 1, four clamping jaws 2 and the clamping jaw drive assembly 3 is as follows:

[0048] The swivel 33 is rotatably sleeved on the mounting connection ring 12 of the mounting plate 1, and the two cylinders 34 are each fixed on the mounting plate 1 by matching the two cylinder mounting holes 11-3 on the body 11 of the mounting plate 1 through a cylinder mounting column 34-1. The piston rods of the two cylinders 34 are respectively fixedly connected to the rear ends of a push rod 34-2, and the front ends of the two push rods 34-2 are respectively fixedly connected to the swivel 33; four linear guide rails 32 are each fixedly arranged in the two upper and lower guide rail mounting grooves 11-2 and the two left and right guide rail mounting grooves 11-2 of the body 11 of the mounting plate 1; four sliders 31 are each slidably sleeved with a linear guide rail 32 by their slide grooves 31-2, and each transmission bearing 31-4 of the four sliders 31 is rotatably provided in the four arc-shaped slots 33-2 of the swivel 33, and the rear ends of the drive shafts 31-3 of the four sliders 31 are The four slider drive shafts passing through the main body 11 of the mounting plate 1 respectively pass through one of the holes 11-4 and are fixedly connected to the inner ring of a transmission bearing 31-4; the four jaws 2 are respectively engaged with the jaw engaging teeth 31-1 of a slider 31 by their docking teeth 21, and the scale pointer 24 of the jaw 2 is set relative to the clamped workpiece diameter size scale 31-7 of the corresponding slider 31, and then according to the size of the clamped workpiece diameter, with the assistance of the scale pointer 24 of the jaw 2 and the clamped workpiece diameter size scale 31-7 of the corresponding slider 31, the meshing position of the jaw 2 and the corresponding slider 31 is adjusted to the right position, and then the position-adjustable mounting bolts 23 in the bolt accommodating slot 22 of the jaw 2 are matched with the corresponding jaw mounting screw holes 31-6 in a group of jaw mounting screw holes 31-6 of the slider 31 to fix the jaw 2 to the corresponding slider 31.

[0049] As can be seen from the foregoing, the anti-pinching collet with adjustable jaw stroke of this embodiment is designed so that when in use, for workpieces with different outer diameters, it is only necessary to quickly and conveniently adjust the installation position of each jaw 2 on the corresponding slide 31, so that a collet of this embodiment can be used to meet the needs of workpieces of different sizes, effectively solving the technical problem in the prior art that similar collets are not well applicable to workpieces of different sizes.

[0050] The stroke adjustment and anti-pinching limit block 43 includes a base 41, a stroke adjustment limit block 42 and an anti-pinching limit block 43; the base 41 is a long block-shaped structural member, and the upper side of the base 41 is provided with a position adjustment groove along the length direction for adjusting the stroke adjustment limit block 42 and the anti-pinching limit block 43 to fix the installation position on the base 41. The stroke adjustment limit block 42 and the anti-pinching limit block 43 cooperate with the position adjustment groove of the base 41, and are fixed at intervals on the base 41 by bolts in an adjustable position. There are four sets of stroke adjustment and anti-pinch flattening components 4. Each set of stroke adjustment and anti-pinch flattening components 4 is fixed on the mounting plate 1 by its base 41 and each matches the position of a slider 31. The stroke adjustment limit block 42 of each set of stroke adjustment and anti-pinch flattening components 4 is arranged on the outside, and the anti-pinch flattening limit block 43 is arranged on the inside; the limit arm 31-5-1 of the limit block 31-5 of the slider 31 can be movably arranged in the gap between the stroke adjustment limit block 42 and the anti-pinch flattening limit block 43.

[0051] During operation, the two pairs of jaws 2 in the up-down and left-right directions respectively move centripetally to clamp the workpiece under the drive of the two pairs of sliders 31. After the two pairs of jaws 2 clamp the workpiece, the two pairs of sliders 31 drive the two pairs of jaws 2 to continue to move centripetally, which is blocked by the four sets of stroke adjustment and anti-pinching limit blocks 43 located on the inner side of the base 41 of the anti-pinching limit blocks 43 of the anti-pinching limit blocks 43 of the anti-pinching limit blocks 43 (the limit arms 31-5-1 of the limit blocks 31-5 of each slider 31 are offset against the corresponding anti-pinching limit blocks 43), so that the two pairs of jaws 2 cannot continue to move centripetally, thereby achieving the purpose of clamping the workpiece and preventing it from being pinched at the same time. During the release process of the workpiece, the two pairs of jaws 2, driven by the two pairs of slides 31, respectively, move away from the center of the chuck. When the two pairs of slides 31 move to the point where the limit arms 31-5-1 of the limit blocks 31-5 of each slide 31 abut against the corresponding stroke adjustment limit blocks 42 located outside the base 41 of the stroke adjustment and anti-pinching assembly 4, the two pairs of jaws 2 have completely released the workpiece. The next movement of the slides 31 to clamp the workpiece begins from this point until the limit arms 31-5-1 of the limit blocks 31-5 of each slide 31 again abut against the corresponding anti-pinching limit blocks 43, and this cycle repeats. Thus, the collet of this embodiment requires only a relatively short stroke for the slides 31 to drive the jaws 2 to clamp and release the workpiece. Compared to similar collets of the prior art that require the jaws to move through the full stroke on the slide to clamp and release the workpiece, the collet of this embodiment significantly improves clamping speed and efficiency, and can effectively save driving energy.

[0052] The frame 6 serves as the installation base of the collet of this embodiment. Preferably, a dust cover 61 is fixedly mounted on the frame 6 to prevent dust from entering the interior of the collet.

[0053] The rotary drive assembly 7 is provided on the frame 6 and is used to drive the mounting plate 1 and the various components provided on the mounting plate 1, including the clamping jaws 2, to rotate when rotation is required. As an implementation method, in this embodiment, the rotary drive assembly 7 includes a reducer 71, a driving gear 72 connected to the reducer 71, a driven gear 73 meshing with the driving gear 72, and a connecting sleeve 74 whose rear end is fixedly connected to the driven gear 73 and whose front end is fixedly connected to the mounting connection ring 12 of the mounting plate 1 by bolts; thereby, the rotary drive assembly 7 allows the mounting plate 1 to rotate when it is required to rotate during use, thereby driving the clamping jaws 2 to rotate when it is required to rotate. The driven gear 73 is a gear with a circular tube extending backward at the center. The connecting sleeve 74 is a structural member that is generally cylindrical.

[0054] The cylinder gas distribution device 8 is provided on the frame 6 and is used to connect the two cylinders 34 with the provided air source. That is, the cylinder gas distribution device 8 is used for the inlet and outlet of the two cylinders 34. Figure 2 As shown, the cylinder gas distribution device 8 includes a gas distribution fixed outer ring 81, a gas distribution rotating inner ring 82 and a gas distribution seal 83; the structure and working principle of the cylinder gas distribution device 8 are existing technologies and are not described in detail.

[0055] See also Figure 1 and Figure 2 The anti-pinching collet of this embodiment has a workpiece receiving hole 9 extending longitudinally along its axis to facilitate receiving and clamping the workpiece during use. This hole 9 is formed by, from front to back, the center hole 11-1 of the mounting plate 1 body 11, the center hole of the mounting connecting ring 12 of the mounting plate 1, the center hole of the connecting sleeve 74, and the center hole of the rearwardly extending circular tube of the driven gear 73, which are connected in sequence.

[0056] 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 collet chuck with adjustable jaw travel and an anti-pinching feature, comprising a frame, a rotary drive assembly mounted on the frame, a rotatable mounting plate driven by the rotary drive assembly, a pair of jaws disposed vertically and horizontally, and a jaw drive assembly mounted on the mounting plate for driving the two pairs of jaws, characterized in that: It also includes a stroke adjustment and anti-pinching assembly provided on the mounting plate for adjusting and limiting the stroke of the two pairs of jaws during operation through the jaw driving assembly and preventing the two pairs of jaws from pinching the workpiece; The mounting plate includes a body and a mounting connection ring. A center hole is provided in the middle of the body. Four guide rail mounting grooves are provided on the front surface of the body in the vertical direction and the front and back direction. The mounting connection ring is provided on the outer periphery of the rear end of the center hole of the body and is integrally connected with the body or fixedly connected. The clamping jaw drive assembly includes two cylinders fixedly mounted on the mounting plate body, a swivel movably mounted on the mounting connection ring of the mounting plate and driven by the two cylinders, a linear guide rail fixedly mounted in each of the four guide rail mounting grooves of the mounting plate body, and a slider each slidably engaged with a linear guide rail and driven by the swivel; The rotating ring is evenly spaced with four arc-shaped slots for transmission. The two cylinders are each fixed on the mounting plate through a cylinder mounting column. The two cylinders are each connected to the rotating ring through a push rod to drive the rotating ring to rotate. The front end surface of the slider is provided with a clamping claw engaging tooth, the middle of the rear end of the slider is provided with a slide groove that is sleeved and slidably matched with the linear guide rail, and a drive shaft that extends backward and passes through the mounting plate is provided below the rear end of the slider, and is rotatably provided in an arc-shaped slot hole of the swivel ring and fixedly connected to the rear end of the drive shaft. A group of clamping claw mounting screw holes are provided on the slider; The rear end surface of the clamping jaw is provided with a docking tooth, and the clamping jaw is provided with a bolt receiving slot hole, and the bolt receiving slot hole is equipped with two or more mounting bolts with adjustable positions; according to the size of the diameter of the clamped workpiece, the docking teeth of each of the four clamping jaws are meshed with the matching teeth of the clamping jaw of a slider, and the four clamping jaws are fixedly connected to the corresponding slider by the adjustable mounting bolts in the bolt receiving slot hole of the clamping jaw and the clamping jaw mounting screw holes at corresponding positions in a group of clamping jaw mounting screw holes of the slider; A scale pointer is fixed on the clamping jaw, and a diameter scale of the clamped workpiece that matches the scale pointer is provided on the front end surface of the slider; The slider is provided with a limit block, and the limit block is provided with a protruding limit arm; the stroke adjustment and anti-pinching limit block includes a base, a stroke adjustment limit block and an anti-pinching limit block which are adjustably fixed on the base, and the anti-pinching limit block and the stroke adjustment limit block are spaced apart on the inner and outer sides of the base; the stroke adjustment and anti-pinching limit block is provided with four sets, each set of stroke adjustment and anti-pinching components is fixed on the mounting plate by its base and cooperates with the position of a slider, and the limit arm of the limit block of each slider can be movably provided in the interval between the stroke adjustment limit block and the anti-pinching limit block of the stroke adjustment and anti-pinching assembly at the corresponding position.

2. The anti-pinching collet with adjustable jaw stroke according to claim 1, characterized in that: It also includes a cylinder gas distribution device provided on the frame for the air inlet and outlet of the two cylinders, a dust cover fixedly installed on the frame, and the rotary drive assembly includes a reducer, a driving gear connected to the reducer, a driven gear meshing with the driving gear, and a connecting sleeve whose rear end is fixedly connected to the driven gear and whose front end is fixedly connected to the mounting connecting ring of the mounting plate.

3. The anti-pinching collet with adjustable jaw stroke according to claim 2, characterized in that: A through hole for accommodating a clamped workpiece and penetrating front to back is provided along the axis.

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