Inflatable chuck for coiled material cylinder core

Abstract

The utility model discloses an inflatable chuck for a coiled material cylinder core. The inflatable chuck comprises an outer cylinder body, an air bag, a wedge block seat, an inner cylinder body, a plurality of wedge blocks, a plurality of key bars and an axial spring, an inflation hole is radially formed in the hole wall corresponding to the rear inner hole of the outer cylinder body; a plurality of key bar insertion holes are uniformly formed in the hole wall of the front inner hole; the air bag is clamped between the air bag seat and the air bag cover plate; the rear air bag seat is mounted in the rear inner hole of the outer cylinder in a manner that the outer port of the air passage is aligned with the inflation hole in the outer cylinder; a plurality of sliding grooves with shallow rear parts and deep front parts are uniformly formed in the outer circumferential surface of the wedge block seat in the circumferential direction; a plurality of wedge block insertion holes are uniformly distributed on the circumference of the cylinder wall of the inner cylinder body; a plurality of wedge blocks are inserted into a plurality of sliding grooves in the wedge block seat and a plurality of wedge block insertion holes in the inner cylinder body in a one-to-one correspondence manner; the plurality of key bars are inserted into the plurality of key bar insertion holes in the outer cylinder body in a one-to-one correspondence manner; and the axial spring is arranged in an inner hole of the wedge block seat. The coiled material cylinder core tensioning device can stably and reliably tension and fix coiled material cylinder cores with different hole diameters.

Description

Technical Field

[0001] The utility model relates to an air expansion chuck for a coiled material core. Background Art

[0002] Currently, there are two methods for winding and unwinding webs in papermaking and rotary printing equipment: shafted and shaftless (cantilevered) winding and unwinding. With shafted winding and unwinding, changing the web requires removing the entire shaft from the finished web core and inserting it into the new one, which is time-consuming and labor-intensive. A web chuck is a shaftless winding and unwinding device used to secure the web and is widely used in automated web unwinding and rewinding systems.

[0003] There are generally two types of coil chucks on the market:

[0004] 1. Use the elastic force of the spring to push the expansion block to tighten the coil core (see Chinese utility model patent ZL201920234395.X). Since the force of the spring is small, it is generally used in non-manufacturing equipment and equipment that does not require high coil tension.

[0005] 2. Use the cylinder to push the top cone to expand the sheet to tighten the coil core (see Chinese utility model patent ZL201320540546.7). Due to the poor pressure-holding performance of the cylinder, as the cylinder is used for a longer time, the pressure-holding time of the cylinder is shortened. It is necessary to continuously replenish air to maintain the pressure. This structure of replenishing air to the rotating cylinder is relatively complex, and the failure rate will also increase accordingly. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects of the prior art and provide a pneumatic expansion chuck for coil cores, which can tension and fix coil cores with different apertures and has stable and reliable tensioning force.

[0007] The purpose of the utility model is achieved as follows: an air expansion chuck for a coil core, comprising an outer cylinder, an air bag, a wedge seat, an inner cylinder, several wedges, several key strips and an axial spring; wherein,

[0008] The outer cylindrical surface of the outer cylinder is divided into a rear outer cylindrical surface and a front outer cylindrical surface, the diameters of which decrease from large to small. The inner hole of the outer cylinder is divided into a rear inner hole, a middle inner hole and a front inner hole, the diameters of which decrease from large to small. The sum of the lengths of the rear inner hole and the middle inner hole is adapted to the length of the rear outer cylindrical surface. An air filling hole is radially provided on the hole wall corresponding to the rear inner hole. Several long waist-shaped key bar insertion holes are evenly distributed on the hole wall of the front inner hole. An annular outer cylinder cover plate is fixed on the front end surface of the outer cylinder, and a plurality of external countersunk holes and a plurality of internal threaded through holes are provided on the outer cylinder cover plate.

[0009] The airbag is sandwiched between the airbag seat and the airbag cover; an L-shaped air duct is provided in the airbag seat, and the airbag seat is installed in the rear inner hole of the outer cylinder in such a manner that the outer end of the air duct is aligned with the inflation hole on the outer cylinder, so that the airbag and the airbag cover are located in the middle inner hole of the outer cylinder; the inflation nozzle of the airbag is installed in the outer end of the air duct through the inflation hole on the outer cylinder;

[0010] The wedge block seat is a cylindrical body with a flange at the rear end. The outer surface of the wedge block seat is evenly distributed around the circumference with a plurality of concave grooves that are shallow at the rear and deep at the front. The wedge block seat is mounted on the front end surface of the airbag cover through the flange in a manner that the plurality of grooves correspond one-to-one with the plurality of key bar insertion holes on the outer cylinder.

[0011] The inner diameter of the inner cylinder is adapted to the outer diameter of the wedge block seat, and the outer diameter of the inner cylinder is smaller than the diameter of the front inner hole of the outer cylinder; a plurality of long waist-shaped wedge block insertion holes are evenly distributed on the circumference of the cylinder wall of the inner cylinder; the inner cylinder is slidably mounted on the outer circumferential surface of the wedge block seat in a manner that the plurality of wedge block insertion holes correspond to the plurality of sliding grooves on the wedge block seat one-to-one, and a plurality of threaded blind holes corresponding to the plurality of external countersunk holes on the outer cylinder cover plate are formed on the front end surface of the inner cylinder, so that the inner cylinder is coaxially fixed to the rear end surface of the outer cylinder cover plate;

[0012] The wedge block is a right-angled trapezoidal block, and the inner end surface of the wedge block is an inclined surface adapted to the bottom surface of the sliding groove on the wedge block seat; the multiple wedge blocks are first inserted into the multiple sliding grooves on the wedge block seat in a one-to-one correspondence, and then inserted radially outward in a one-to-one correspondence into the multiple wedge block insertion holes on the inner cylinder;

[0013] The key bar is a long rectangular block, and a clamping plate extends from the inside of each of the two end surfaces. A spring mounting groove is provided on the outer end surface of the clamping plate, and a radial spring is installed in the spring mounting groove. The plurality of key bars are inserted into the plurality of key bar insertion holes on the outer cylinder from the front inner hole of the outer cylinder radially outward in a one-to-one correspondence, so that the inner end surfaces of the plurality of key bars contact the outer end surfaces of the plurality of wedge blocks in a one-to-one correspondence, and the outer end surfaces of the radial springs at both ends of the plurality of key bars abut against the inner wall surface of the front inner hole of the outer cylinder.

[0014] The axial spring is installed in the inner hole of the wedge block seat, and the front end of the axial spring is fixed on a spring cover plate. The spring cover plate is provided with a plurality of countersunk holes corresponding to the plurality of internal threaded through holes on the outer cylinder cover plate, so that the spring cover plate is coaxially fixed on the front end surface of the outer cylinder cover plate.

[0015] The above-mentioned pneumatic chuck for coil core, wherein the diameter of the rear outer surface of the outer cylinder is larger than the outer diameter of the coil core; the diameter of the front outer surface of the outer cylinder is smaller than the inner diameter of the coil core.

[0016] The above-mentioned air expansion chuck for coil core, wherein the diameter of the airbag seat is adapted to the aperture of the rear inner hole of the outer cylinder, and the airbag seat is installed on the step surface between the rear inner hole and the middle inner hole of the outer cylinder by a plurality of screws.

[0017] The pneumatic chuck for coiled material core of the utility model has the following characteristics:

[0018] 1. The airbag used can use the compressibility of gas to achieve spring effect. The airbag can be separated from the air source after one inflation, which is well adapted to the rotating working state of the coil. The airbag maintains pressure for a long time, so that the six key strips can firmly tension the coil core. It can be used for coil cores with different inner diameters, so that the coil is evenly stressed. Even if the tension of the coil is too large, it will not cause circumferential slippage between the six key strips and the coil core, thereby effectively avoiding the deviation of the coil.

[0019] 2. It can shorten the operation time. The separation and clamping of the air bag from the coil core only takes a few seconds to complete the inflation and deflation of the air bag. There is no need to disassemble any parts at the end of the coil core to tightly engage with the coil core. The coil core is also easy to clamp. The coil core can be moved and fixed in any position by the inflation and deflation action. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an axial cross-sectional view of the pneumatic chuck for coil core of the utility model;

[0021] Figure 2 yes Figure 1 A-direction view in;

[0022] Figure 3 yes Figure 1 BB view in the figure;

[0023] Figure 4 yes Figure 1 CC view in the figure;

[0024] Figure 5 This is an axial cross-sectional view of the outer cylinder in the pneumatic chuck of the present utility model;

[0025] Figure 5a yes Figure 5 DD view in the;

[0026] Figure 6 This is a schematic structural diagram of the wedge seat in the pneumatic chuck of the present invention;

[0027] Figure 6a yes Figure 6 EE directed graph in ;

[0028] Figure 7This is an axial cross-sectional view of the inner cylinder of the pneumatic chuck of the present invention;

[0029] Figure 7a yes Figure 7 A top view of

[0030] Figure 8 It is a plan view of the key bar in the pneumatic chuck of the present utility model;

[0031] Figure 8a yes Figure 8 FF view in the. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] See also Figures 1 to 8a The utility model of the pneumatic expansion chuck for the coil core includes an outer cylinder 1, an air bag 2, a wedge block seat 3, an inner cylinder 4, six wedge blocks 5, six key strips 6 and an axial spring 8.

[0034] Five threaded blind holes are provided on the rear end surface of the outer cylinder 1 for connecting to the mechanical arm of the device through five screws 101; the mechanical arm can move up and down, left and right, and has driving or braking functions.

[0035] The outer cylindrical surface of the outer cylinder 1 is a first-stage stepped cylindrical surface, namely, it is divided into a rear outer cylindrical surface 1A and a front outer cylindrical surface 1B, the diameter of which is larger and smaller than the outer diameter of the coil core 100; the diameter of the front outer cylindrical surface 1B is smaller than the inner diameter of the coil core 100; the inner hole of the outer cylinder 1 is a second-stage stepped cylindrical surface, namely, it is divided into a rear inner hole 1a, a middle inner hole 1b and a front inner hole 1c, the sum of the lengths of the rear inner hole 1a and the middle inner hole 1b is equal to The length of the rear outer circle 1A is adapted; five threaded blind holes 110 are evenly distributed on the step surface between the rear inner hole 1a and the middle inner hole 1b; an air filling hole 1C is radially opened on the hole wall corresponding to the rear inner hole 1a; six long waist-shaped key bar insertion holes 10 are evenly distributed on the hole wall of the front inner hole 1c; an annular outer cylinder cover plate 11 is fixed on the front end surface of the outer cylinder 1, and four external countersunk holes 111 and four internal threaded through holes 112 (see Figure 5 and Figure 5a ).

[0036] The airbag 2 is sandwiched between the airbag seat 2A and the airbag cover 2B; the airbag seat 2A is a disc body with a diameter that matches the diameter of the rear inner hole 1a of the outer cylinder 1. An L-shaped air duct 20 is provided in the airbag seat 2A, that is, the direction of the air duct 20 is from the outer circumferential surface of the airbag seat 2A radially inward and then axially forward to the inner cavity of the airbag 2; the airbag seat 2A is provided with four mounting holes that correspond to the four threaded blind holes on the outer cylinder 1. The airbag seat 2A is provided with an outer surface of the air duct 20. The port is installed in the rear inner hole 1a of the outer cylinder 1 in an aligned manner with the inflation hole 1C on the outer cylinder 1, and is fixed on the step surface between the rear inner hole 1a and the middle inner hole 1b of the outer cylinder 1 by four screws, so that the airbag 2 and the airbag cover 2B are located in the middle inner hole 1b of the outer cylinder 1; the inflation nozzle 2C of the airbag 2 is installed in the outer port of the airway 20 through the inflation hole 1C of the outer cylinder 1; at least three connecting holes are evenly distributed on the circumference of the airbag cover 2B.

[0037] The wedge block seat 3 is a cylindrical body with a flange 3A at the rear end. Six concave chute grooves 30 (see FIG. Figure 6 and Figure 6a ), the wedge seat 3 is arranged between the middle inner hole 1b and the front inner hole 1c of the outer cylinder 1, and the wedge seat 3 is installed on the front end surface of the airbag cover 2B by at least three flange bolts in a way that the six sliding grooves 30 correspond one-to-one with the six key strip insertion holes 10 on the outer cylinder 1.

[0038] The inner diameter of the inner cylinder 4 is adapted to the outer diameter of the wedge seat 3, and the outer diameter of the inner cylinder 4 is smaller than the diameter of the front inner hole 1c of the outer cylinder 1; six long waist-shaped wedge insertion holes 40 (see FIG. Figure 7 and Figure 7a ); The inner cylinder 4 is slidably mounted on the outer circumferential surface of the wedge seat 3 in a manner that the six wedge insertion holes 40 correspond one-to-one to the six slide grooves 30 on the wedge seat 3, and a plurality of threaded blind holes 41 are provided on the front end surface of the inner cylinder 4 that correspond one-to-one to the four external countersunk holes 111 on the cylinder cover 11, so that the inner cylinder 4 is coaxially fixed to the rear end surface of the outer cylinder cover 11 by four screws.

[0039] The wedge block 5 is a right-angled trapezoidal block. The thickness of the wedge block 5 is adapted to the width of the slide groove 30 on the wedge block seat 3. The inner end surface of the wedge block 5 is an inclined surface adapted to the bottom surface of the slide groove 30 on the wedge block seat 3; the six wedge blocks 5 are first embedded in the six slide grooves 30 on the wedge block seat 3 one by one, and then inserted radially outward one by one into the six wedge block insertion holes 40 on the inner cylinder 4.

[0040] The key bar 6 is a long rectangular block. The thickness of the key bar 6 is adapted to the width of the key bar insertion hole 10 on the outer cylinder 1. A card plate 60 is extended from the inside of each end surface of the key bar 6. A spring mounting groove is provided on the outer end surface of the card plate 60. A radial spring 7 (see FIG. 1 ) is installed in the spring mounting groove. Figure 8 and Figure 8a ); The six key bars 6 are respectively inserted into the six key bar insertion holes 10 on the outer cylinder 1 radially outward from the front inner hole 1c of the outer cylinder 1, so that the inner end surfaces of the six key bars 6 are in contact with the outer end surfaces of the six wedge blocks 5, and the outer end surfaces of the radial springs 7 at both ends of the six key bars 6 are against the inner wall surface of the front inner hole 1c of the outer cylinder 1.

[0041] The axial spring 8 is installed in the inner hole of the wedge seat 3, and the front end of the axial spring 8 is fixed on a spring cover plate 80. The spring cover plate 80 is provided with four countersunk holes corresponding to the four internal threaded through holes 112 on the outer cylinder cover plate 11, so that the spring cover plate 80 is coaxially fixed to the front end surface of the outer cylinder cover plate 11 by four screws.

[0042] The pneumatic chuck for the coil core of the present invention is firstly moved forward coaxially (in the longitudinal center direction of the coil core 100) by two robotic arms, each carrying a pneumatic chuck, and inserted into the inner holes at both ends of the coil core 100 until the step surface between the rear outer surface 1A and the front outer surface 1B of the outer cylinder 1 touches the end wall of the coil core 100. Then, the airbag 2 is inflated through the inflation nozzle 2C, and the airbag 2 will expand axially. The wedge block seat 3 is pressed against the inner cylinder 4 by the airbag cover plate 2B. Push forward, because the inner cylinder 4 is fixed in the outer cylinder 1, when the wedge block seat 3 moves forward, the six wedge blocks 5 correspondingly embedded in the six slide grooves 30 and correspondingly inserted into the six wedge block insertion holes 40 of the inner cylinder 4 are radially pushed outward, and at the same time, the six wedge blocks 5 also correspondingly push the six key strips 6 along the six key strip insertion holes 10 on the outer cylinder 1 radially outward to push out the front outer surface 1B until the outer end surfaces of the six key strips 6 hit the inner hole wall of the coil core 100 (see Figure 1 and Figure 4 ), tensioning the coil core 100 to fix the coil, which can not only move the coil, but also drive the clamped coil to unwind and rewind.

[0043] When the inflation nozzle 2C is deflated, the axial spring 8 will push the wedge block seat 3 backward. When the wedge block seat 3 moves backward, the airbag 2 will shrink axially. At the same time, due to the action of the two radial springs 7 on each key strip 6, the six key strips 6 will correspond to the six wedge blocks 5 and retract radially toward the inner hole of the outer cylinder 1, so that the six key strips 6 loosen the inner hole wall of the coil core 100. The two robotic arms move backward at the same time to disengage the entire air expansion chuck from the coil core 100, and the coil core 100 can be removed and the coil can be replaced.

[0044] The pneumatic chuck for a coil core of the present invention utilizes an airbag 2 that utilizes the compressibility of gas to achieve a spring action. After a single inflation, the airbag 2 can be separated from the air source, effectively adapting to the rotating working state of the coil. The airbag 2 maintains pressure for a long time, allowing the six key bars 6 to firmly tension the coil core 100. Even if the tension of the coil is too great, circumferential slippage between the six key bars 6 and the coil core 100 will not occur, thereby effectively preventing the coil from running off course. The surfaces of the chute 30 on the wedge block seat 3, the wedge block insertion hole 40 on the inner cylinder 4, and the key bar insertion hole 10 on the outer cylinder 1 are all smooth, and the wedge 5 has a certain hardness, which can reduce the friction coefficient of the wedge 5 during its sliding within the chute 30 of the wedge block seat 3. Furthermore, the six chute 30 on the wedge block seat 3 are evenly distributed around the circumference, which can prevent the inner cylinder 4 from being subjected to radial forces when the six wedge blocks 5 are ejected.

[0045] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. An air expansion chuck for a coil core, comprising an outer cylinder, an air bag, a wedge block seat, an inner cylinder, a plurality of wedge blocks, a plurality of key bars and an axial spring; characterized in that: The outer cylindrical surface of the outer cylinder is divided into a rear outer cylindrical surface and a front outer cylindrical surface, the diameters of which decrease from large to small. The inner hole of the outer cylinder is divided into a rear inner hole, a middle inner hole and a front inner hole, the diameters of which decrease from large to small. The sum of the lengths of the rear inner hole and the middle inner hole is adapted to the length of the rear outer cylindrical surface. An air filling hole is radially provided on the hole wall corresponding to the rear inner hole. Several long waist-shaped key bar insertion holes are evenly distributed on the hole wall of the front inner hole. An annular outer cylinder cover plate is fixed on the front end surface of the outer cylinder, and a plurality of external countersunk holes and a plurality of internal threaded through holes are provided on the outer cylinder cover plate. The airbag is sandwiched between the airbag seat and the airbag cover; an L-shaped air duct is provided in the airbag seat, and the airbag seat is installed in the rear inner hole of the outer cylinder in such a manner that the outer end of the air duct is aligned with the inflation hole on the outer cylinder, so that the airbag and the airbag cover are located in the middle inner hole of the outer cylinder; the inflation nozzle of the airbag is installed in the outer end of the air duct through the inflation hole on the outer cylinder; The wedge block seat is a cylindrical body with a flange at the rear end. The outer surface of the wedge block seat is evenly distributed around the circumference with a plurality of concave grooves that are shallow at the rear and deep at the front. The wedge block seat is mounted on the front end surface of the airbag cover through the flange in a manner that the plurality of grooves correspond one-to-one with the plurality of key bar insertion holes on the outer cylinder. The inner diameter of the inner cylinder is adapted to the outer diameter of the wedge block seat, and the outer diameter of the inner cylinder is smaller than the diameter of the front inner hole of the outer cylinder; a plurality of long waist-shaped wedge block insertion holes are evenly distributed on the circumference of the cylinder wall of the inner cylinder; the inner cylinder is slidably mounted on the outer circumferential surface of the wedge block seat in a manner that the plurality of wedge block insertion holes correspond to the plurality of sliding grooves on the wedge block seat one-to-one, and a plurality of threaded blind holes corresponding to the plurality of external countersunk holes on the outer cylinder cover plate are formed on the front end surface of the inner cylinder, so that the inner cylinder is coaxially fixed to the rear end surface of the outer cylinder cover plate; The wedge block is a right-angled trapezoidal block, and the inner end surface of the wedge block is an inclined surface adapted to the bottom surface of the sliding groove on the wedge block seat; the multiple wedge blocks are first inserted into the multiple sliding grooves on the wedge block seat in a one-to-one correspondence, and then inserted radially outward in a one-to-one correspondence into the multiple wedge block insertion holes on the inner cylinder; The key bar is a long rectangular block, and a clamping plate extends from the inside of each of the two end surfaces. A spring mounting groove is provided on the outer end surface of the clamping plate, and a radial spring is installed in the spring mounting groove. The plurality of key bars are inserted into the plurality of key bar insertion holes on the outer cylinder from the front inner hole of the outer cylinder radially outward in a one-to-one correspondence, so that the inner end surfaces of the plurality of key bars contact the outer end surfaces of the plurality of wedge blocks in a one-to-one correspondence, and the outer end surfaces of the radial springs at both ends of the plurality of key bars abut against the inner wall surface of the front inner hole of the outer cylinder. The axial spring is installed in the inner hole of the wedge block seat, and the front end of the axial spring is fixed on a spring cover plate. The spring cover plate is provided with a plurality of countersunk holes corresponding to the plurality of internal threaded through holes on the outer cylinder cover plate, so that the spring cover plate is coaxially fixed on the front end surface of the outer cylinder cover plate.

2. The pneumatic chuck for coil core according to claim 1, characterized in that: The diameter of the rear outer cylindrical surface of the outer cylinder is larger than the outer diameter of the coil core; the diameter of the front outer cylindrical surface of the outer cylinder is smaller than the inner diameter of the coil core.

3. The pneumatic chuck for coil core according to claim 1, characterized in that: The diameter of the airbag seat is adapted to the aperture of the rear inner hole of the outer cylinder, and the airbag seat is mounted on the step surface between the rear inner hole and the middle inner hole of the outer cylinder by a plurality of screws.

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