Inflatable chuck for coiled material cylinder core

Abstract

The invention discloses an inflatable chuck for a coiled material barrel core. The inflatable chuck comprises an outer barrel body, an air bag, a wedge block seat, an inner barrel 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 invention relates to an air expansion chuck for a coiled material core. Background Art

[0002] At present, there are two ways to wind and unwind the coils in papermaking equipment and rotary printing equipment, namely shaft-type winding and unwinding and shaftless (cantilever) winding and unwinding. If the shaft-type winding and unwinding is used, when changing the roll paper, the entire shaft needs to be pulled out from the finished coil core and then inserted into the new coil core, which is time-consuming and labor-intensive. The coil chuck is a shaftless winding and unwinding device used to fix the coil, and is widely used in automated coil unwinding and winding devices.

[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 invention patent ZL201920234395.X). Since the force of the spring to push 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 open the expansion plate to tighten the coil core (see Chinese invention patent ZL201320540546.7). Due to the poor pressure-maintaining performance of the cylinder, as the cylinder is used for a longer time, the pressure-maintaining time of the cylinder is shortened, and 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 increase accordingly. Summary of the invention

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

[0007] The object of the present invention is achieved as follows: an air expansion chuck for a coil core comprises an outer cylinder, an air bag, a wedge block seat, an inner cylinder, a plurality of wedge blocks, a plurality of 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 whose diameters change from large to small, and the inner hole of the outer cylinder is divided into a rear inner hole, a middle inner hole and a front inner hole whose diameters change from large to small, and the sum of the length of the rear inner hole and the length of the middle inner hole is adapted to the length of the rear outer cylindrical surface; an inflation hole is radially opened on the hole wall corresponding to the rear inner hole; a plurality of 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 opened on the outer cylinder cover plate;

[0009] The airbag is sandwiched between the airbag seat and the airbag cover; an L-shaped airway is provided in the airbag seat, and the rear airbag seat is installed in the rear inner hole of the outer cylinder in a manner that the outer port of the airway 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 port of the airway through the inflation hole on the outer cylinder;

[0010] The wedge block seat is a cylindrical body with a flange at the rear end, and a plurality of concave sliding grooves that are shallow at the rear and deep at the front are evenly distributed on the outer circumference of the wedge block seat. 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 sliding grooves correspond to the plurality of key bar insertion holes on the outer cylinder one by one;

[0011] The inner diameter of the inner cylinder is adapted to the outer diameter of the wedge 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 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 seat in a manner that the plurality of wedge insertion holes correspond to the plurality of sliding grooves on the wedge seat one by 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 on 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 slide groove on the wedge block seat; a plurality of wedge blocks are firstly embedded in a plurality of slide grooves on the wedge block seat in a one-to-one correspondence, and then radially outwardly inserted in a plurality of wedge block insertion holes on the inner cylinder in a one-to-one correspondence;

[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 installation groove is provided on the outer end surface of the clamping plate, and a radial spring is installed in the spring installation groove; a plurality of key bars are inserted into a plurality of key bar insertion holes on the outer cylinder body radially outward from the front inner hole of the outer cylinder body one by one, so that the inner end surfaces of the plurality of key bars contact the outer end surfaces of the plurality of wedge blocks one by one, and the outer end surfaces of the radial springs at the two ends of the plurality of key bars are pressed against the inner wall surface of the front inner hole of the outer cylinder body;

[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 expansion chuck for the coil core, wherein 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.

[0016] The above-mentioned air expansion chuck for the 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 air expansion chuck for the coil core of the present invention has the following characteristics:

[0018] 1. The airbag used can use the compressibility of gas to achieve spring action. The airbag can be separated from the gas source after one inflation, which is well adapted to the rotating working state of the coil. The airbag has a long-lasting pressure retention, so that the six key strips can firmly tension the coil core. It can be used for coil cores with different inner diameters to make the coil 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 expansion device and the coil core only takes a few seconds to complete the inflation and deflation of the airbag. 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 easy to clamp. The coil core can be moved and fixed in any position by the action of inflation and deflation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axial cross-sectional view of the air expansion chuck for the coil core of the present invention;

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

[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 is an axial cross-sectional view of the outer cylinder in the air expansion chuck of the present invention;

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

[0026] Figure 6 It is a schematic structural diagram of a wedge seat in the air expansion chuck of the present invention;

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

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

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

[0030] Figure 8 is a plan view of a key strip in the air expansion chuck of the present invention;

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

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

[0033] See also Figures 1 to 8a The air expansion chuck for the coil core of the present invention comprises 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 with the mechanical arm of the device through five screws 101; the mechanical arm can move up, 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, that is, 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, and the diameter of the rear outer cylindrical surface 1A is larger 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, that is, it is divided into a rear inner hole 1a, a middle inner hole 1b and a front inner hole 1c, the sum of the length of the rear inner hole 1a and the length of 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 arranged on the step surface between the rear inner hole 1a and the middle inner hole 1b; an air filling hole 1C is radially arranged on the hole wall corresponding to the rear inner hole 1a; six long waist-shaped key bar insertion holes 10 are evenly arranged 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 whose diameter matches the aperture of the rear inner hole 1a of the outer cylinder 1, and an L-shaped airway 20 is provided in the airbag seat 2A, that is, the direction of the airway 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 corresponding to the four threaded blind holes on the outer cylinder 1, and the airbag seat 2A is provided with an outer surface of the airway 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 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 slide 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 block seat 3 in a manner that the six wedge block insertion holes 40 correspond one-to-one to the six slide grooves 30 on the wedge block seat 3, and a plurality of threaded blind holes 41 corresponding one-to-one to the four external countersunk holes 111 on the cylinder cover plate 11 are provided on the front end surface of the inner cylinder 4, so that the inner cylinder 4 is coaxially fixed to the rear end surface of the outer cylinder cover plate 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, and 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, and a clamping plate 60 is extended inside each of the two end surfaces of the key bar 6. A spring installation groove is provided on the outer end surface of the clamping plate 60, and a radial spring 7 is installed in the spring installation groove (see 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 has 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] When the pneumatic chuck for the coil core of the present invention is in operation, first, two mechanical arms each carry a pneumatic chuck and coaxially move forward (in the length center direction of the coil core 100) to insert into the inner holes at both ends of the coil core 100, until the step surface between the rear outer cylindrical surface 1A and the front outer cylindrical surface 1B of the outer cylinder 1 hits the end wall of the coil core 100, and then the airbag 2 is inflated through the inflation nozzle 2C, and the airbag 2 will expand axially, and the wedge block seat 3 is placed in the inner cylinder 4 by the airbag cover plate 2B. Push forward. Since 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 the wedge block insertion holes 40 correspondingly inserted in the six wedge block insertion holes 40 of the inner cylinder 4 are pushed out radially outward. At the same time, the six wedge blocks 5 also push the six key strips 6 one by one along the six key strip insertion holes 10 on the outer cylinder 1 radially outward to the front outer cylindrical surface 1B until the outer end surfaces of the six key strips 6 are pushed against 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 backwards. When the wedge block seat 3 moves backwards, 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 cylinder 1, so that the six key strips 6 loosen the inner hole wall of the coil core 100. The two robotic arms move backwards at the same time to detach the entire air expansion chuck from the coil core 100, so that the coil core 100 can be removed and the coil can be replaced.

[0044] The air expansion chuck for the coil core of the present invention uses an air bag 2 that can realize the spring effect by utilizing the compressibility of gas. The air bag 2 can be separated from the gas source after one inflation, which is well adapted to the rotating working state of the coil. The air bag 2 has a long-lasting pressure retention, so that the six key strips 6 can firmly tension the coil core 100. Even if the tension of the coil is too large, the six key strips 6 will not cause circumferential slippage between the coil core 100, thereby effectively avoiding the deviation of the coil. The surfaces of the slide groove 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 block 5 has a certain hardness, which can reduce the friction coefficient of the wedge block 5 in the process of sliding in the slide groove 30 of the wedge block seat 3; in addition, the six slide grooves 30 on the wedge block seat 3 are evenly distributed around the circumference, which can avoid the inner cylinder 4 from being subjected to radial force 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 relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to 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 strips 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 whose diameters change from large to small, and the inner hole of the outer cylinder is divided into a rear inner hole, a middle inner hole and a front inner hole whose diameters change from large to small, and the sum of the length of the rear inner hole and the length of the middle inner hole is adapted to the length of the rear outer cylindrical surface; an inflation hole is radially opened on the hole wall corresponding to the rear inner hole; a plurality of 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 opened on the outer cylinder cover plate; The airbag is sandwiched between the airbag seat and the airbag cover; an L-shaped airway is provided in the airbag seat, and the rear airbag seat is installed in the rear inner hole of the outer cylinder in a manner that the outer port of the airway 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 port of the airway through the inflation hole on the outer cylinder; The wedge block seat is a cylindrical body with a flange at the rear end, and a plurality of concave sliding grooves that are shallow at the rear and deep at the front are evenly distributed on the outer circumference of the wedge block seat. 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 sliding grooves correspond to the plurality of key bar insertion holes on the outer cylinder one by one; The inner diameter of the inner cylinder is adapted to the outer diameter of the wedge 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 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 seat in a manner that the plurality of wedge insertion holes correspond to the plurality of sliding grooves on the wedge seat one by 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 on 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 slide groove on the wedge block seat; a plurality of wedge blocks are firstly embedded in a plurality of slide grooves on the wedge block seat in a one-to-one correspondence, and then radially outwardly inserted in a plurality of wedge block insertion holes on the inner cylinder in a one-to-one correspondence; 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 installation groove is provided on the outer end surface of the clamping plate, and a radial spring is installed in the spring installation groove; a plurality of key bars are inserted into a plurality of key bar insertion holes on the outer cylinder body radially outward from the front inner hole of the outer cylinder body one by one, so that the inner end surfaces of the plurality of key bars contact the outer end surfaces of the plurality of wedge blocks one by one, and the outer end surfaces of the radial springs at the two ends of the plurality of key bars are pressed against the inner wall surface of the front inner hole of the outer cylinder body; 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 matched with 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.

Images