CN104772494B - Elastic chuck - Google Patents

Abstract

The invention relates to an elastic chuck, comprising a cylinder, wherein an axial through cavity is arranged in the cylinder, the through cavity is provided with a positioning shaft, the outer wall of the cylinder is provided with at least two groove positions, each groove position is respectively provided with a positioning ring, each positioning ring consists of at least two positioning arcs, two ends of each positioning arc are respectively in threaded connection with the bottom of each groove position through a positioning screw, a protruding block is integrally formed on the inner side of each positioning arc, the groove position corresponding to the protruding block is provided with a through hole, the through hole is communicated with the through cavity, the protruding block is inserted into the through hole, a positioning round table is arranged at the position of each positioning shaft corresponding to the protruding block, each positioning screw comprises an integrally formed screw cap and a screw rod, each screw rod comprises an integrally formed screw thread part; the elastic chuck is simple in structure, when the cylindrical pipe is clamped, the positioning rings are opened simultaneously to clamp the cylindrical pipe, and stress is uniform, so that the thickness of the side wall of the processed cylindrical pipe is consistent, the defective rate of products is reduced, and the quality of the products is improved.

Description

an elastic chuck

technical field

The invention relates to the technical field of light transmission devices, in particular to an elastic collet.

Background technique

A collet is a jig that clamps a cylindrical tube for processing. The structure of the existing elastic collet is unreasonable, one end has a large diameter and the other end has a small diameter, and the force is uneven. At the same time, when the collet is rotated by the motor, a large centrifugal force will be generated, which makes the force on the cylindrical tube uneven , so that the thickness of the side wall of the processed cylindrical tube varies greatly, and the size changes greatly, which seriously increases the defective rate of the product, reduces the quality of the product, and increases the production cost.

In addition, the existing collets still have the situation that the clamping force is not easy to control. If the clamping force is too large, the cylindrical tube will be easily broken; The shape tube falls from the chuck, which reduces the processing quality and processing efficiency.

Contents of the invention

In order to overcome the above-mentioned defects, the present invention provides an elastic chuck. The elastic chuck has a simple structure, and the diameters at both ends are the same. When the chuck is rotated by the motor, the cylindrical tube will not be affected by the centrifugal force, and the force will be uniform, so that the thickness of the side wall of the processed cylindrical tube is consistent, and the size does not change, reducing the number of times the product is produced. The product rate is improved, the quality of the product is improved, the production cost is reduced, and the economic benefit is improved; the clamping force of the collet is easy to control, and the processing quality and processing efficiency are improved.

In order to achieve the above object, the present invention adopts the following technical solutions.

A collet, comprising a cylinder, the cylinder is provided with an axial cavity, the cavity is provided with a positioning shaft, the outer wall of the cylinder is provided with at least two slots, each slot Positioning rings are respectively provided, and the positioning rings are composed of at least two positioning arcs, the two ends of the positioning arcs are screwed to the bottom of the slot through positioning screws, and the inner side of the positioning arcs is integrally formed with a protrusion. The position corresponding to the protruding block is provided with a through hole in the slot, the through hole communicates with the through cavity, the protruding block is inserted into the through hole, and the positioning shaft is provided with a position corresponding to the protruding block. The positioning round platform, the positioning screw includes an integrally formed nut and a screw rod, the screw rod includes an integrally formed threaded part and a smooth part, the smooth part is close to the nut, and the threaded part is away from the nut.

Wherein, two adjacent positioning arcs use the same positioning screw to be screwed to the bottom of the slot.

Wherein, the length of the smooth portion is 3-5 mm.

Wherein, the smooth part is covered with a soft buffer ring, and the thickness of the soft buffer ring is 1-1.5 mm.

Wherein, the side wall of the cylinder is symmetrically provided with a first pin hole and a second pin hole, the position of the positioning shaft corresponding to the first pin hole is provided with a third pin hole, and the cylinder is provided with a pin, The pins respectively pass through the first pin hole, the second pin hole and the third pin hole.

Wherein, the lengths of the first pin hole and the second pin hole are 1.5 to 3 times the diameter of the pin, and the diameter of the third pin hole is equal to the diameter of the pin.

Wherein, the positioning shaft includes an outer shaft and an inner shaft, and the outer shaft is provided with an axial channel, and the axial channel communicates with both ends of the outer shaft, and the inner shaft is inserted into the axial channel, so The positioning round platform is arranged on the outer shaft, the inner shaft is provided with a fourth pin hole, the pin passes through the fourth pin hole, the length of the fourth pin hole is the same as the length of the first pin hole Equally, the inner end of the inner shaft is provided with a connecting portion.

Wherein, the outer end of the inner shaft is provided with a groove, and the groove is provided with an elastic component, and the outer end of the elastic component is screwed to the axial channel.

Wherein, the elastic assembly includes a fixed base, a spring, a first fixed piece and a second fixed piece, the fixed base is provided with a fixed cavity, the second fixed piece passes through the fixed cavity, and the first fixed piece passes through the fixed cavity. The fixing part includes an integrally formed cap and a cylinder, the spring is inserted into the cylinder, one end of the spring abuts against the cap, the other end of the spring abuts against the fixing seat, and the The second fixing part is screwed to the first fixing part, the outer periphery of the fixing seat is provided with threads, the fixing seat is screwed to the axial passage through the threads, and the cap is connected to the pin Abut.

Wherein, the inner end of the cylinder is provided with a fixing ring, and the fixing ring is fixedly connected with the cylinder, and the fixing ring is provided with a plurality of fixing holes, and the fixing holes are equidistantly arranged.

The beneficial effects of the present invention are: an elastic collet of the present invention includes a cylinder, and an axial through cavity is provided in the cylinder, and a positioning shaft is provided in the through cavity, and the outer wall of the cylinder is provided with At least two slots, each slot is provided with a positioning ring, the positioning ring is composed of at least two positioning arcs, the two ends of the positioning arcs are screwed to the bottom of the slot through positioning screws, and the positioning The inner side of the arc is integrally formed with a protrusion, and the position corresponding to the position of the protrusion is provided with a through hole, the through hole communicates with the through cavity, the protrusion is inserted into the through hole, and the positioning The position of the shaft corresponding to the protrusion is provided with a positioning round platform, the positioning screw includes an integrally formed nut and a screw rod, the screw rod includes an integrally formed threaded part and a smooth part, and the smooth part is close to the nut, so The threaded portion is far away from the nut; the elastic collet has a simple structure, and the diameters at both ends are the same. When the motor rotates, the cylindrical tube will not be affected by the centrifugal force, and the force will be uniform, so that the thickness of the side wall of the processed cylindrical tube is the same, and the size does not change, which reduces the defective rate of the product and improves the quality of the product. The quality of the collet reduces the production cost and improves the economic benefit; the clamping force of the collet is easy to control, which improves the processing quality and processing efficiency.

Description of drawings

The present invention will be further described with the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

Fig. 1 is a structural schematic diagram of an elastic collet of the present invention.

Fig. 2 is a sectional view of an elastic collet of the present invention.

Fig. 3 is a schematic diagram of an exploded structure of an elastic collet according to the present invention.

Figure 4 is a schematic structural view of the cylinder.

Fig. 5 is a sectional view of a combined state of a cylinder and a positioning shaft.

Fig. 6 is a schematic structural view of the positioning shaft.

Fig. 7 is a sectional view of a positioning shaft.

Fig. 8 is a cross-sectional view of the elastic component.

Fig. 9 is a schematic diagram of an exploded structure of an elastic component.

Fig. 10 is a sectional view of the combined state of the set screw and the soft buffer ring.

Fig. 11 is a schematic structural view of the inner shaft.

Fig. 12 is a sectional view of the inner shaft.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, which are preferred embodiments of the present invention.

Example.

As shown in Figures 1 to 12, an elastic collet of the present invention includes a cylinder 1, and an axial through cavity is provided in the cylinder 1, and a positioning shaft 2 is provided in the through cavity, and a positioning shaft 2 is provided in the cylinder. The outer wall of the barrel 1 is provided with at least two slots 12, and each slot 12 is respectively provided with a positioning ring 3, and the positioning ring 3 is composed of at least two positioning arcs 32, and the two ends of the positioning arcs 32 are respectively positioned The screw 31 is screwed to the bottom of the slot 12, and the inner side of the positioning arc 32 is integrally formed with a protrusion 321, and the position of the slot 12 corresponding to the protrusion 321 is provided with a through hole 121, and the through hole 121 Connected with the through cavity, the protrusion 321 is inserted into the through hole 121, the position of the positioning shaft 2 corresponding to the protrusion 321 is provided with a positioning round platform 212, and the positioning screw 31 includes an integrally formed nut 314 and a screw, the screw includes an integrally formed threaded portion 311 and a smooth portion 312 , the smooth portion 312 is close to the nut 314 , and the threaded portion 311 is away from the nut 314 .

As a preferred technical solution, there are three slots 12 in this embodiment, and the positioning ring 3 is composed of three positioning arcs 32 .

The elastic collet has a simple structure, and the diameters at both ends are the same. When clamping the cylindrical tube, each positioning ring 3 is opened at the same time, thereby clamping the cylindrical tube. When the collet is rotated by the motor, the cylindrical tube The tube will not be affected by the centrifugal force, and the force is uniform, so that the thickness of the side wall of the processed cylindrical tube is the same, and the size does not change, which reduces the defective rate of the product, improves the quality of the product, and reduces the production cost. The economic benefit is improved; the clamping force of the elastic collet is easy to control, and the processing quality and processing efficiency are improved.

The two adjacent positioning arcs 32 of this embodiment use the same positioning screw 31 to be screwed to the bottom of the slot 12; The screw 31 can provide a sliding track for the positioning ring 3, and then use the positioning ring 3 to clamp or loosen the cylindrical tube.

The length of the smooth part 312 of the present embodiment is 3-5 mm; as a preferred technical solution, the length of the smooth part 312 of the present embodiment is 4 mm; Gliding track, high reliability.

The smooth part 312 of this embodiment is covered with a soft buffer ring 313, and the thickness of the soft buffer ring 313 is 1 to 1.5 mm; this setting structure is simple, easy to form, and can buffer the positioning ring 3 and the nut 314 , to prevent the positioning ring 3 from frequently rubbing the nut 314 and damaging the nut 314. At the same time, it can also buffer the clamping force of the positioning ring 3 to prevent the clamping force of the positioning ring 3 from being too large and breaking the cylindrical tube , so as to maintain the quality of the product, reduce the defective rate, and reduce the production cost.

The side wall of the cylinder 1 in this embodiment is symmetrically provided with a first pin hole 11 and a second pin hole, and the position of the positioning shaft 2 corresponding to the first pin hole 11 is provided with a third pin hole 211. Tube 1 is provided with pin 6, and described pin 6 passes through first pin hole 11, second pin hole and third pin hole 211 respectively; The diameter of described third pin hole 211 is equal to the diameter of described pin 6; The length of the pin hole 11 and the second pin hole is 1.5 to 3 times the diameter of the pin 6; as a preferred technical solution, the length of the first pin hole 11 and the second pin hole of this embodiment It is twice the diameter of the pin 6; the setting structure is simple and easy to form, the pin 6 can drive the positioning shaft 2 to advance or retreat as a whole, and the pin 6 can be within the limited length of the first pin hole 11 and the second pin hole Forward or backward, so that the positioning shaft 2 can apply a support force to the positioning ring 3, so that the positioning ring 3 can apply a clamping force to the cylindrical tube to clamp the cylindrical tube.

The positioning shaft 2 of this embodiment includes an outer shaft 21 and an inner shaft 22, the outer shaft 21 is provided with an axial channel, the axial channel communicates with both ends of the outer shaft 21, and the inner shaft 22 is inserted into the The axial channel, the positioning round table 212 is set on the outer shaft 21, the inner shaft 22 is provided with a fourth pin hole 222, the pin 6 passes through the fourth pin hole 222, the fourth pin The length of the hole 222 is equal to the length of the first pin hole 11, and the inner end of the inner shaft 22 is provided with a connecting portion 223, which is connected to the output end of the oil cylinder during assembly; the setting structure Simple and easy to form, it is beneficial to control the supporting force applied by the positioning shaft 2 to the positioning ring 3, thereby controlling the clamping force of the positioning ring 3 on the cylindrical tube, preventing the cylindrical tube from being broken, and reducing the defective rate.

The outer end of the inner shaft 22 in this embodiment is provided with a groove 221, and the groove 221 is provided with an elastic assembly 5, and the outer end of the elastic assembly 5 is screwed to the axial channel; the elastic assembly 5 includes a fixing seat 53, a spring 52, a first fixing piece 51 and a second fixing piece 54, the fixing seat 53 is provided with a fixing cavity, the second fixing piece 54 passes through the fixing cavity, and the first fixing piece 51 It includes an integrally formed cap body 511 and a cylinder 512, the spring 52 is inserted into the cylinder 512, one end of the spring 52 abuts against the cap body 511, and the other end of the spring 52 abuts against the fixing seat 53, the second fixing member 54 is screwed to the first fixing member 51, the outer peripheral edge of the fixing seat 53 is provided with threads, and the fixing seat 53 is threaded with the axial channel through the threads. Next, the cap body 511 abuts against the pin 6; the setting structure is simple and easy to form, so that the clamping force of the collet is easy to control, and the cylindrical tube will not be broken, so the reliability is high.

The inner end of cylinder 1 of this embodiment is provided with fixed ring 4, and described fixed ring 4 is fixedly connected with described cylinder 1, and described fixed ring 4 is provided with several fixed holes 41, and several fixed holes 41 are equidistantly spaced. Arrangement; As a preferred technical solution, four fixing holes 41 are provided on the fixing ring 4 of the present embodiment; the setting structure is simple, easy to form, and it is convenient to fix the cylinder 1 to the frame through the fixing ring 4, It is beneficial to the assembly and use of the elastic collet, and has high practicability.

The principle of the present invention is: the oil cylinder drives the connecting portion 223 of the inner shaft 22 to move forward, so that the inner shaft 22 moves forward, the inner shaft 22 drives the pin 6 to move forward, the pin 6 drives the outer shaft 21 to move forward, and the outer shaft 21 The positioning round platform 212 on the upper surface exerts a supporting force on the protrusion 321 on the positioning arc 32, so that the positioning arc 32 is opened, thereby clamping the cylindrical tube; wherein, due to the first pin hole 11 and the second pin hole The length is limited, which limits the displacement distance of the pin 6, and also limits the displacement distance of the positioning shaft 2. After the pin 6 moves forward for a short distance, it cannot continue to move forward. The pin 6 is compressed to generate a backward elastic force (buffering force), so that the positioning shaft 2 generates a backward thrust, thereby avoiding excessive force applied by the oil cylinder, breaking the cylindrical tube, and making the cylindrical tube The force is uniform, the clamping is stable, and the clamping force is neither too large nor too small; thus, the processing accuracy and quality of the product are improved, the defective rate is reduced, and the economic benefit is improved.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand , the technical solution of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims (8)

1. A collet, characterized in that: it comprises a cylinder, the cylinder is provided with an axial cavity, the cavity is provided with a positioning shaft, and the outer wall of the cylinder is provided with at least two grooves Each slot is provided with a positioning ring, the positioning ring is composed of at least two positioning arcs, the two ends of the positioning arcs are screwed to the bottom of the slot through positioning screws, and the inner side of the positioning arcs A protruding block is integrally formed, and a through hole is opened at the position corresponding to the protruding block in the slot, and the through hole communicates with the through cavity, the protruding block is inserted into the through hole, and the positioning shaft corresponds to the The position of the protrusion is provided with a positioning round table, and the positioning screw includes an integrally formed nut and a screw rod, and the screw rod includes an integrally formed threaded part and a smooth part, the smooth part is close to the nut, and the threaded part is far away from the nut. In the nut, the side wall of the cylinder is symmetrically provided with a first pin hole and a second pin hole, and the position of the positioning shaft corresponding to the first pin hole is provided with a third pin hole, and the cylinder is provided with There are pins, and the pins respectively pass through the first pin hole, the second pin hole and the third pin hole; two adjacent positioning arcs are screwed to the bottom of the slot by the same positioning screw. 2. The elastic collet according to claim 1, characterized in that: the length of the smooth part is 3-5 mm. 3 . The collet according to claim 1 , wherein a soft buffer ring is sheathed on the smooth part, and the thickness of the soft buffer ring is 1-1.5 mm. 4 . 4. A collet according to claim 3, characterized in that: the lengths of the first pin hole and the second pin hole are 1.5 to 3 times the diameter of the pin, and the third The diameter of the pin hole is equal to the diameter of the pin. 5. A collet chuck according to claim 1, characterized in that: the positioning shaft comprises an outer shaft and an inner shaft, the outer shaft is provided with an axial channel, and the axial channel and the outer shaft The two ends of the inner shaft are connected, the inner shaft is inserted into the axial passage, the positioning round platform is arranged on the outer shaft, the inner shaft is provided with a fourth pin hole, and the inner end of the inner shaft is provided with a connecting portion. 6. An elastic collet according to claim 5, characterized in that: the outer end of the inner shaft is provided with a groove, the groove is provided with an elastic assembly, and the outer end of the elastic assembly is in contact with the Axial channel screw connection. 7. An elastic collet according to claim 6, characterized in that: the elastic assembly includes a fixing seat, a spring, a first fixing piece and a second fixing piece, and the fixing seat is provided with a fixing cavity, so that The second fixing part passes through the fixing cavity, the first fixing part includes an integrally formed cap and a cylinder, the spring is inserted into the cylinder, and one end of the spring abuts against the cap , the other end of the spring abuts against the fixing seat, the second fixing member is screwed to the first fixing member, the outer periphery of the fixing seat is provided with threads, and the fixing seat passes through the thread Screwed with the axial channel. 8. A collet according to claim 1, characterized in that: the inner end of the cylinder is provided with a fixed ring, the fixed ring is fixedly connected with the cylinder, and the fixed ring is provided with A plurality of fixing holes are arranged equidistantly at intervals.