A telescopic air collet
By simplifying the structure of the air chuck and adopting an independent air circuit design, combined with bearings and speed control valves, the problems of high processing difficulty and maintenance difficulties caused by the complex structure in the existing technology have been solved, realizing low-cost and high-efficiency air chuck operation.
Patent Information
- Application Number
- CN202521991913.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-16
AI Technical Summary
Existing telescopic air expansion chucks have complex structures, resulting in high processing difficulty and increased costs. They also have many seals that are prone to leakage, making maintenance difficult and affecting equipment reliability and production efficiency.
Design a compact air expansion chuck with axial limiting and circumferential rotation connection between the chuck shaft and the chuck rotation shaft. The air path is independent. The stability is improved by using tapered roller bearings and deep groove ball bearings. A speed regulating valve is set to control the gas flow, simplifying the air path structure and enhancing the sealing performance.
It reduces processing and maintenance costs, improves equipment performance and reliability, simplifies operating procedures, reduces the risk of air leakage, and extends equipment lifespan.
Smart Images
Figure CN224677552U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of clamping technology, and in particular to a telescopic air-expanding chuck. Background Technology
[0002] An air-expanding chuck is a common type of winding chuck that uses compressed air to control the expansion and contraction of the chuck, thereby securing and releasing roll-shaped materials (such as paper, film, fabric, and metal foil). It is primarily used in winding and unwinding equipment and is one of the core components in the roll material handling industry. Its core working principle utilizes the combination of air pressure and mechanical structure to achieve keyless, highly concentric clamping.
[0003] With the continuous development of industrial production, the requirements for the performance and reliability of winding chucks, such as air-expanding chucks, are becoming increasingly stringent. High-efficiency and stable winding chucks can improve production efficiency, ensure product quality, and promote the development and progress of related industries. Their performance directly affects the overall operation and production efficiency of the winding equipment, making them indispensable in industrial production.
[0004] Telescopic air chucks in related technologies require complex structures to achieve multiple combined movements such as air expansion, rotation, and telescopic movement. This is especially true when pneumatically driven for telescopic movement, where the air circuit structure becomes intricate, and dynamic sealing at multiple points must be considered. This structural complexity increases the difficulty and cost of manufacturing individual components. Furthermore, the increased number of seals due to the complex structure also increases the difficulty of sealing, significantly raising the risk of leakage. Additionally, seals are prone to aging and leakage, bearings are easily worn and difficult to replace, resulting in high maintenance costs. Utility Model Content
[0005] In order to design a telescopic air chuck with a relatively simple structure and improve its airtightness and reduce its production and use costs, this application provides a telescopic air chuck.
[0006] The telescopic air-expansion chuck provided in this application adopts the following technical solution: A telescopic air-expanding chuck includes a cylinder body and a chuck shaft; One end of the chuck shaft is provided with an air expansion head, and the other end of the chuck shaft is provided with a high-speed rotary air connector. The interior of the chuck shaft has an air expansion channel connecting the high-speed rotary air connector and the air expansion head. The chuck shaft is fitted with a chuck rotating shaft, and the chuck shaft and the chuck rotating shaft are axially limited and circumferentially rotatable. The chuck shaft is axially slidably disposed within the cylinder body, forming a sliding cavity between the two; the outer circumferential surface of the chuck shaft has an annular partition along its circumference, which divides the sliding cavity between the cylinder body and the chuck shaft into a first cavity and a second cavity; the cylinder body is respectively provided with a first air hole communicating with the first cavity and a second air hole communicating with the second cavity. The cylinder body is also equipped with a drive wheel for rotating the chuck shaft.
[0007] Inside the cylinder, the annular partition of the chuck shaft acts like a piston, while the chuck shaft itself acts like a piston rod. During unwinding, the chuck shaft and the air expansion head stop rotating; the air expansion head exhausts air through the expansion channel and high-speed rotating air connector, causing it to contract radially; then, air is supplied to the first cavity through the first air hole, and the second cavity exhausts air through the second air hole. This allows the chuck shaft to drive the chuck shaft to move axially towards the second cavity, achieving axial contraction of the entire air expansion chuck. During winding, air is supplied to the second cavity through the second air hole, and the first cavity exhausts air through the first air hole. This allows the chuck shaft to drive the chuck shaft to move axially towards the first cavity, achieving axial extension of the entire air expansion chuck. This allows the air expansion head to move into the center hole of the roll material. Then, air is supplied to the air expansion head through the high-speed rotating air connector and expansion channel, causing it to expand radially and tighten the roll material. Finally, a drive motor drives the drive wheel to rotate, which in turn drives the chuck shaft and the air expansion head to rotate, achieving the winding function.
[0008] By adopting the above technical solution, the air expansion channel inside the chuck shaft connects the high-speed rotating air connector and the air expansion head. An external air source is connected to the high-speed rotating air connector to supply air to the air expansion head, which can inflate and expand to clamp paper tubes and other roll materials. The chuck shaft and the chuck rotating shaft are axially limited and circumferentially rotated, allowing the chuck shaft to rotate within the chuck rotating shaft. The chuck rotating shaft is axially slidably disposed in the cylinder body. An annular partition divides the sliding cavity into a first cavity and a second cavity. By venting through the first and second air holes, the extension or retraction of the chuck rotating shaft within the cylinder body can be controlled, thereby driving the extension and retraction of the chuck shaft. The drive wheel on the cylinder body can drive the chuck shaft to rotate. The whole system can simultaneously provide clamping, extension, and winding motions for paper tubes and other roll materials. In this application, the air passage of the air expansion head is connected to an external air source from the inside and end of the chuck shaft; the driving air source for the extension and retraction movement of the air expansion head, chuck shaft, and chuck rotating shaft is connected to an external air source from the side of the cylinder body. The two air passages are independent of each other and do not interfere with each other, which facilitates the processing and assembly of parts. The entire air expansion chuck in this application has a compact structure and is easy to operate. Due to its relatively simple structure, it is easy to process, has low cost, and is easy to maintain. The selection of reasonable connection and sealing structures makes it have good load-bearing capacity, good sealing performance, and safe operation.
[0009] Optionally, the chuck shaft and the chuck rotating shaft are rotatably connected by a first bearing assembly, the first bearing assembly including tapered roller bearings and deep groove ball bearings located at both ends of the chuck rotating shaft; The chuck shaft is fitted with a bearing inner spacer; the two ends of the bearing inner spacer abut against the inner surface of the tapered roller bearing and the inner surface of the deep groove ball bearing, respectively. One end of the chuck shaft is fixedly provided with a front pressure cover that abuts against the outer side of the tapered roller bearing; the other end of the chuck shaft is fixedly provided with a rear pressure cover that abuts against the outer side of the deep groove ball bearing.
[0010] By adopting the above technical solution, tapered roller bearings and deep groove ball bearings are used as the first bearing assembly to realize the circumferential rotational connection between the chuck shaft and the chuck rotating shaft, which can improve the stability and load-bearing capacity of the chuck shaft during rotation. By setting the bearing inner spacer, front cover and rear cover to axially limit the bearing, the first bearing assembly is prevented from axially moving during operation, ensuring the stability and reliability of the first bearing assembly and improving the overall rigidity of the structure.
[0011] Optionally, the two ends of the bearing inner spacer abut against the inner side surface of the inner ring of the tapered roller bearing and the inner side surface of the inner ring of the deep groove ball bearing, respectively; a first abutting step is provided on the chuck shaft on the outer side of the inner ring of the tapered roller bearing; a lock nut and a nut retaining ring are provided on the chuck shaft on the outer side of the inner ring of the deep groove ball bearing. A second abutting step is provided on the chuck shaft inside the outer ring of the tapered roller bearing; a third abutting step is provided on the chuck shaft inside the outer ring of the deep groove ball bearing; the front pressure cover abuts against the outer surface of the outer ring of the tapered roller bearing; and the rear pressure cover abuts against the outer surface of the outer ring of the deep groove ball bearing.
[0012] By adopting the above technical solution, the inner and outer rings of the tapered roller bearing and deep groove ball bearing are axially limited by the bearing inner spacer, the first abutment step, the lock nut and nut retaining ring, the second abutment step, the third abutment step, the front cover and the rear cover, ensuring the stability of the axial limiting and circumferential rotation connection between the chuck shaft and the chuck rotating shaft, improving the rigidity and load-bearing capacity of the overall structure, reducing bearing wear and replacement difficulty, and lowering maintenance costs.
[0013] Optionally, a first dustproof ring is provided between the outer side of the inner ring of the tapered roller bearing and the first abutment step; a second dustproof ring is provided between the side of the front pressure cover and the outer peripheral surface of the chuck shaft.
[0014] By adopting the above technical solution, the first and second dustproof rings can prevent dust and other impurities from entering the telescopic air chuck, avoiding wear on bearings and other components caused by impurities, improving the service life of the telescopic air chuck, enhancing the operational stability and safety of the entire mechanism, reducing the probability of failures caused by impurities, and lowering maintenance costs.
[0015] Optionally, the cylinder block includes a front cylinder head, a rear cylinder head, and a flange sleeve; the flange sleeve is located between the front cylinder head and the rear cylinder head, one end of the flange sleeve is fixedly connected to the front cylinder head, and the other end of the flange sleeve is fixedly connected to the rear cylinder head. The first air port is located on the front cylinder head, and a first speed control valve is provided at the first air port of the front cylinder head; the second air port is located on the rear cylinder head, and a second speed control valve is provided at the second air port of the rear cylinder head.
[0016] By adopting the above technical solution, the cylinder block is configured to include a front cylinder head, a rear cylinder head, and a flange sleeve, which facilitates the processing, assembly, and maintenance of the cylinder block. The first speed control valve is set at the first air port and the second speed control valve is set at the second air port, which can conveniently control the air intake speed of the first and second chambers, thereby accurately controlling the extension and retraction speed of the chuck shaft. This makes the operation of the telescopic air chuck simpler, and the overall structure is compact and simple, reducing the processing difficulty and cost.
[0017] Optionally, the sliding cavity is located between the front cylinder head and the rear cylinder head, the outer peripheral surface of the annular partition is slidably connected to the inner wall of the flange sleeve, and a wear-resistant ring and a first sealing ring are provided between the outer peripheral surface of the annular partition and the inner wall of the flange sleeve. A first cylinder bushing is provided between the inner wall of the front cylinder head and the outer peripheral surface of the chuck shaft, and a second cylinder bushing is provided between the inner wall of the rear cylinder head and the outer peripheral surface of the chuck shaft.
[0018] By adopting the above technical solution, the sliding cavity is located between the front cylinder head and the rear cylinder head. With the help of the annular partition, the sliding cavity is divided into a first cavity and a second cavity, which can realize the forward and backward movement of the chuck shaft. A wear-resistant ring and a first sealing ring are set between the outer circumference of the annular partition and the inner wall of the flange sleeve, which can reduce wear and improve sealing performance, and reduce the risk of air leakage. A first cylinder bushing is set between the inner wall of the front cylinder head and the outer circumference of the chuck shaft, and a second cylinder bushing is set between the inner wall of the rear cylinder head and the outer circumference of the chuck shaft, which can support the chuck shaft, reduce wear, and ensure its stable sliding.
[0019] Optionally, the drive wheel is located at the end of the cylinder body away from the air expansion head, and the drive wheel and the end of the cylinder body are rotatably connected by a second bearing assembly; the drive wheel has a mounting hole in the middle, and the chuck shaft passes through the mounting hole of the drive wheel and the two are circumferentially limited and axially slidably connected.
[0020] By adopting the above technical solution, the drive wheel can rotate flexibly relative to the cylinder body and drive the chuck shaft to rotate. At the same time, the chuck shaft is allowed to slide axially relative to the drive wheel, thereby realizing the winding and telescopic functions of the telescopic air expansion chuck. It has a compact structure, can provide clamping, extension and winding movements in a centralized manner, is easy to operate, has a low cost, and has good load-bearing capacity, safe operation and good sealing performance.
[0021] Optionally, the second bearing assembly includes a turntable bearing; a mounting groove is provided on the side of the drive wheel facing the cylinder body, the turntable bearing is located in the mounting groove, the outer ring of the turntable bearing is fixedly connected to the drive wheel, and the inner ring of the turntable bearing is fixedly connected to the end of the cylinder body; The outer circumferential surface of the chuck shaft is connected to the wall of the mounting hole of the drive wheel via a spline.
[0022] By adopting the above technical solution, the circumferential limiting and axial sliding connection between the chuck shaft and the drive wheel are achieved, enabling the drive wheel to drive the chuck shaft to rotate, and the chuck shaft to slide axially relative to the drive wheel. Combined with the overall solution, the chuck shaft can achieve telescopic movement while being driven by the drive wheel to achieve winding movement. Its overall structure is compact, has good load-bearing capacity, is simple to operate, low in cost and easy to maintain, and at the same time ensures sealing performance.
[0023] Optionally, the air expansion channel extends through both ends of the chuck shaft along its central axis, the end of the chuck shaft is fixedly connected to the air expansion head, and the air expansion channel is connected to the air passage of the air expansion head; a second sealing ring is provided between the end face of the chuck shaft and the connecting surface of the air expansion head.
[0024] By adopting the above technical solution, the gas from the high-speed rotating air connector can smoothly reach the air expansion head, realizing the air expansion function of the air expansion head; by setting a second sealing ring, gas leakage can be prevented, sealing performance can be improved, thereby ensuring the normal operation of the air expansion chuck.
[0025] Optionally, a third sealing ring is provided between one end of the flange sleeve and the front cylinder head, and a fourth sealing ring is provided between the other end of the flange sleeve and the rear cylinder head; a fifth sealing ring is provided between the inner wall of the front cylinder head and the outer peripheral surface of the chuck shaft, and a sixth sealing ring is provided between the inner wall of the rear cylinder head and the outer peripheral surface of the chuck shaft.
[0026] By adopting the above technical solution, the sealing performance of the telescopic air expansion chuck can be improved, the risk of air leakage can be reduced, and maintenance problems caused by air leakage can be reduced. At the same time, it helps to improve the overall performance and safety. Moreover, the structure is simple, which helps to reduce the processing difficulty and cost.
[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. In this application, the air passage of the air expansion head is connected to an external air source from the inside and end of the chuck shaft; the driving air source for the extension and retraction movement of the air expansion head, chuck shaft, and chuck rotating shaft is connected to an external air source from the side of the cylinder body. The two air passages are independent of each other and do not interfere with each other, which facilitates the processing and assembly of parts.
[0028] 2. The telescopic air-expanding chuck in this application has a compact structure. Through the rational layout of components such as the chuck shaft, chuck rotating shaft, and cylinder body, it can provide clamping, extension, and winding movements in a centralized manner. The chuck shaft is equipped with an air expansion head and a high-speed rotary air connector, and has an internal air expansion channel to realize the air expansion head for clamping. The chuck rotating shaft slides axially within the cylinder body to realize extension and retraction movements. The drive wheel drives the chuck shaft to rotate, realizing the winding movement, which greatly improves the performance of the equipment.
[0029] 3. Compared with existing telescopic air chucks, the telescopic air chuck in this application has a simpler overall structure, a more streamlined number of components and connections, reducing processing difficulty and costs. Furthermore, due to its simple structure, maintenance operations such as replacing bearings and seals are more convenient, further reducing maintenance costs. Attached Figure Description
[0030] Figure 1 This is a cross-sectional view of the telescopic air-expanding chuck in this application.
[0031] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.
[0032] Figure 3 This is a partial cross-sectional view of the telescopic air-expanding chuck in this application.
[0033] In the picture: 10. Cylinder block; 11. Sliding chamber; 12. First chamber; 13. Second chamber; 14. First air port; 15. Second air port; 16. Front cylinder head; 17. Rear cylinder head; 18. Flange sleeve; 20. Chuck shaft; 21. Air expansion channel; 22. First abutment step; 30. Head swelling due to gas; 40. High-speed rotary air connector; 50. Chuck pivot; 51. Annular partition; 52. Second abutment step; 53. Third abutment step; 60. Drive wheel; 61. Mounting hole; 62. Mounting slot; 70. First bearing assembly; 71. Tapered roller bearing; 72. Deep groove ball bearing; 73. Bearing inner spacer; 74. Front cover; 75. Rear cover; 76. Lock nut; 77. Nut retaining ring; 78. First dustproof retaining ring; 79. Second dustproof retaining ring; 80. Second bearing assembly; 81. Turntable bearing; 90. First speed control valve; 100. Second speed control valve; 110. Wear-resistant ring; 120. First sealing ring; 130. First cylinder bushing; 140. Second cylinder bushing; 150. Second sealing ring; 160. Third sealing ring; 170. Fourth sealing ring; 180. Fifth sealing ring; 190. Sixth sealing ring. Detailed Implementation
[0034] The following will be combined with the appendix Figure 1 - Appendix Figure 3 The technical solutions in the embodiments of this utility model are clearly and completely described herein. The described embodiments are only possible technical implementations of this utility model and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of this utility model without creative effort, and these embodiments are also within the protection scope of this utility model.
[0035] Reference Figure 1 and Figure 2As shown, the telescopic air expansion chuck in this application includes a cylinder body 10, a chuck shaft 20, a chuck rotating shaft 50, an air expansion head 30, a drive wheel 60, and a high-speed rotary air connector 40; the air expansion head 30 and the high-speed rotary air connector 40 are respectively disposed at both ends of the chuck shaft 20, and an air expansion channel 21 is provided inside the chuck shaft 20, which is used to connect the high-speed rotary air connector 40 and the air expansion head 30. The chuck shaft 50 is sleeved on the chuck shaft 20, and the cylinder body 10 is sleeved outside the chuck shaft 50. The chuck shaft 20 and the chuck shaft 50 are rotatably connected by the first bearing assembly 70, and the chuck shaft 20 and the chuck shaft 50 are axially limited and circumferentially rotatably connected. The drive wheel 60 is rotatably connected to the end of the cylinder body 10 by the second bearing assembly 80, and the drive wheel 60 is located at the end of the cylinder body 10 away from the air expansion head 30 and close to the high-speed rotating air connector 40, so as to avoid interference between the drive wheel 60 and the air expansion head 30. The drive wheel 60 has a mounting hole 61 in the middle, and the chuck shaft 20 passes through the mounting hole 61 of the drive wheel 60, and the two are circumferentially limited and axially slidably connected. In this application, the air expansion head 30 has an internal air bladder structure, which can expand radially after inflation to tighten paper tubes and other roll materials; one end of the high-speed rotary air connector 40 is fixed to the end of the chuck shaft 20 and communicates with the air expansion channel 21 inside the chuck shaft 20, and the other end of the high-speed rotary air connector 40 is connected to an air pipe for communication with a solenoid valve and an external air source. The two ends of the high-speed rotary air connector 40 can rotate relative to each other and have a dynamic sealing structure, that is, one end of the high-speed rotary air connector 40 can rotate with the chuck shaft 20, while the other end remains stationary; the specific structure and principle of the air expansion head 30 and the high-speed rotary air connector 40 are existing technologies and will not be described in detail here.
[0036] Reference Figure 1 and Figure 3As shown, a sliding cavity 11 is formed between the chuck shaft 50 and the cylinder body 10. The outer circumferential surface of the chuck shaft 50 has an annular partition 51 along its circumference, which divides the sliding cavity 11 between the cylinder body 10 and the chuck shaft 50 into a first cavity 12 and a second cavity 13. The cylinder body 10 is provided with a first air hole 14 communicating with the first cavity 12 and a second air hole 15 communicating with the second cavity 13. Inside the cylinder body 10, the annular partition 51 of the chuck shaft 50 acts similarly to a piston, and the chuck shaft 50 acts similarly to a piston rod. The drive wheel 60 can be a gear or a pulley, and the drive motor is connected to the drive wheel 60 via a gear meshing or belt transmission structure. During unwinding, the chuck shaft 20 and the air expansion head 30 stop rotating; the air expansion head 30 exhausts air through the air expansion channel 21 and the high-speed rotating air connector 40, causing the air expansion head 30 to contract radially; then, air is supplied to the first cavity 12 through the first air hole 14, and air is exhausted from the second cavity 13 through the second air hole 15. The chuck shaft 50 can then drive the chuck shaft 20 to move towards the second cavity 13, achieving axial contraction of the entire air expansion chuck; during winding, air is supplied to the second cavity 13 through the second air hole 15, causing the first... The cavity 12 exhausts air through the first air hole 14, and the chuck shaft 50 can drive the chuck shaft 20 to move towards the first cavity 12, realizing the axial extension of the entire air expansion chuck, so that the air expansion head 30 moves into the center hole of the roll material. Then, the air expansion head 30 is supplied with air through the high-speed rotating air connector 40 and the air expansion channel 21, and the air expansion head 30 expands radially to tighten the roll material. Then, the drive motor drives the drive wheel 60 to rotate, thereby driving the chuck shaft 20 and the air expansion head 30 to rotate, realizing the winding function.
[0037] Reference Figure 1 and Figure 2As shown, the first bearing assembly 70 includes a tapered roller bearing 71 and a deep groove ball bearing 72 located at both ends of the chuck shaft 50; a bearing inner spacer 73 is sleeved on the chuck shaft 20; the two ends of the bearing inner spacer 73 abut against the inner side of the tapered roller bearing 71 and the inner side of the deep groove ball bearing 72, respectively; a front pressure cap 74 is fixedly provided at one end of the chuck shaft 50, abutting against the outer side of the tapered roller bearing 71; and a rear pressure cap 75 is fixedly provided at the other end of the chuck shaft 50, abutting against the outer side of the deep groove ball bearing 72. Furthermore, the two ends of the bearing inner spacer 73 abut against the inner side surface of the inner ring of the tapered roller bearing 71 and the inner side surface of the inner ring of the deep groove ball bearing 72, respectively; a first abutting step 22 is provided on the chuck shaft 20 on the outer side of the inner ring of the tapered roller bearing 71; a locking nut 76 and a nut retaining ring 77 are provided on the chuck shaft 20 on the outer side of the inner ring of the deep groove ball bearing 72; a second abutting step 52 is provided on the chuck shaft 50 on the inner side of the outer ring of the tapered roller bearing 71; a third abutting step 53 is provided on the chuck shaft 50 on the inner side of the outer ring of the deep groove ball bearing 72; a front pressure cover 74 abuts against the outer side surface of the outer ring of the tapered roller bearing 71; and a rear pressure cover 75 abuts against the outer side surface of the outer ring of the deep groove ball bearing 72. The inner and outer rings of the tapered roller bearing 71 and the deep groove ball bearing 72 are axially limited by the bearing inner spacer 73, the first abutment step 22, the locking nut 76 and the nut retaining ring 77, the second abutment step 52, the third abutment step 53, the front pressure cover 74 and the rear pressure cover 75, so as to prevent the first bearing assembly 70 from axially moving during operation, ensuring the stability of the axial limiting and circumferential rotation connection between the chuck shaft 20 and the chuck rotating shaft 50, improving the rigidity and load-bearing capacity of the overall structure, reducing bearing wear and replacement difficulty, and lowering maintenance costs.
[0038] Reference Figure 2 As shown, a first dustproof ring 78 is provided between the outer side of the inner ring of the tapered roller bearing 71 and the first abutment step 22; a second dustproof ring 79 is provided between the side of the front pressure cover 74 and the outer peripheral surface of the chuck shaft 20. The first dustproof ring 78 and the second dustproof ring 79 prevent dust and other impurities from entering the telescopic air chuck, avoiding wear on bearings and other components, improving the service life of the telescopic air chuck, enhancing the operational stability and safety of the entire mechanism, reducing the probability of malfunctions caused by impurities, and lowering maintenance costs.
[0039] Reference Figure 1 and Figure 3As shown, the cylinder body 10 includes a front cylinder head 16, a rear cylinder head 17, and a flange sleeve 18; this facilitates the machining, assembly, and maintenance of the cylinder body 10. The flange sleeve 18 is located between the front cylinder head 16 and the rear cylinder head 17, with one end of the flange sleeve 18 fixedly connected to the front cylinder head 16 and the other end of the flange sleeve 18 fixedly connected to the rear cylinder head 17. A first air hole 14 is provided on the front cylinder head 16, and a first speed control valve 90 is provided at the first air hole 14 of the front cylinder head 16; a second air hole 15 is provided on the rear cylinder head 17, and a second speed control valve 100 is provided at the second air hole 15 of the rear cylinder head 17. This allows for convenient control of the air intake speed of the first chamber 12 and the second chamber 13, thereby precisely controlling the extension and retraction speed of the chuck shaft 50, making the operation of the telescopic air expansion chuck simpler, and the overall structure is compact and simple, reducing machining difficulty and cost.
[0040] Reference Figure 1 and Figure 3 As shown, the sliding cavity 11 is located between the front cylinder head 16 and the rear cylinder head 17. The outer circumferential surface of the annular partition 51 is slidably connected to the inner wall of the flange sleeve 18. A wear-resistant ring 110 and a first sealing ring 120 are provided between the outer circumferential surface of the annular partition 51 and the inner wall of the flange sleeve 18, which can reduce wear and improve sealing performance, and reduce the risk of air leakage. A first cylinder bushing 130 is provided between the inner wall of the front cylinder head 16 and the outer circumferential surface of the chuck shaft 50, and a second cylinder bushing 140 is provided between the inner wall of the rear cylinder head 17 and the outer circumferential surface of the chuck shaft 50, which can support the chuck shaft 50, reduce wear, and ensure its stable sliding.
[0041] Reference Figure 1 As shown, the second bearing assembly 80 includes a turntable bearing 81; a mounting groove 62 is provided on the side of the drive wheel 60 facing the cylinder body 10, the turntable bearing 81 is located in the mounting groove 62, the outer ring of the turntable bearing 81 is fixedly connected to the drive wheel 60, and the inner ring of the turntable bearing 81 is fixedly connected to the end of the cylinder body 10; the outer circumferential surface of the chuck shaft 20 is connected to the wall of the mounting hole 61 of the drive wheel 60 through a spline, thus realizing the circumferential limiting and axial sliding connection between the chuck shaft 20 and the drive wheel 60, so that the drive wheel 60 can drive the chuck shaft 20 to rotate, and the chuck shaft 20 can slide axially relative to the drive wheel 60. Combined with the overall scheme, the chuck shaft 20 can realize the telescopic movement while being driven by the drive wheel 60 to realize the winding movement. Its overall structure is compact, has good load-bearing capacity, is simple to operate, low in cost and easy to maintain, and at the same time ensures sealing performance.
[0042] Reference Figure 1 , Figure 2 and Figure 3As shown, the air expansion channel 21 runs through both ends of the chuck shaft 20 along the central axis of the chuck shaft 20. The end of the chuck shaft 20 is fixedly connected to the air expansion head 30, and the air expansion channel 21 is connected to the air passage of the air expansion head 30. A second sealing ring 150 is provided between the end face of the chuck shaft 20 and the connecting surface of the air expansion head 30. This allows the gas from the high-speed rotating air connector 40 to smoothly reach the air expansion head 30, realizing the air expansion function of the air expansion head 30. By providing the second sealing ring 150, gas leakage can be prevented, sealing performance can be improved, and the normal operation of the air expansion chuck can be guaranteed. A third sealing ring 160 is provided between one end of the flange sleeve 18 and the front cylinder head 16, and a fourth sealing ring 170 is provided between the other end of the flange sleeve 18 and the rear cylinder head 17; a fifth sealing ring 180 is provided between the inner wall of the front cylinder head 16 and the outer peripheral surface of the chuck shaft 50, and a sixth sealing ring 190 is provided between the inner wall of the rear cylinder head 17 and the outer peripheral surface of the chuck shaft 50. This can improve the sealing performance of the telescopic air expansion chuck, reduce the risk of air leakage, reduce maintenance problems caused by air leakage, and at the same time help to improve the overall performance and safety. Moreover, the structure is simple and helps to reduce the processing difficulty and cost.
[0043] The implementation principle is as follows: During unwinding, the chuck shaft 20 and the air expansion head 30 stop rotating; the air expansion head 30 exhausts air through the air expansion channel 21 and the high-speed rotating air connector 40, and the air expansion head 30 contracts radially; then, air is supplied to the first cavity 12 through the first speed regulating valve 90 and the first air hole 14, and the second cavity 13 exhausts air through the second air hole 15 and the second speed regulating valve 100, so the chuck shaft 50 can drive the chuck shaft 20 to move towards the second cavity 13, realizing the axial contraction of the entire air expansion chuck; during winding, air is supplied through the second speed regulating valve 100 and the second air hole 15. Air is supplied to the second cavity 13, and the first cavity 12 is vented through the first air hole 14 and the first speed regulating valve 90. The chuck shaft 50 can then drive the chuck shaft 20 to move towards the first cavity 12, realizing the axial extension of the entire air expansion chuck. This allows the air expansion head 30 to move into the center hole of the roll material. Then, the air expansion head 30 is supplied with air through the high-speed rotating air connector 40 and the air expansion channel 21. The air expansion head 30 expands radially, thus tightening the roll material. Then, the drive motor drives the drive wheel 60 to rotate, thereby driving the chuck shaft 20 and the air expansion head 30 to rotate, realizing the winding function.
[0044] In this application, the air passage of the air expansion head 30 is connected to an external air source from the inside and end of the chuck shaft 20; the driving air source for the extension and retraction movement of the air expansion head 30, the chuck shaft 20, and the chuck rotating shaft 50 is connected to an external air source from the side of the cylinder body 10. The two air passages are independent of each other and do not interfere with each other, which facilitates the processing and assembly of parts; the entire air expansion chuck in this application has a compact structure and is easy to operate. Due to its relatively simple structure, it is easy to process, has low cost, and is easy to maintain. The selection of reasonable connection and sealing structures makes it have good load-bearing capacity, good sealing performance, and safe operation.
[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A telescopic pneumatic chuck, comprising a cylinder body (10) and a chuck shaft (20); characterized in that, One end of the chuck shaft (20) is provided with an air expansion head (30), and the other end of the chuck shaft (20) is provided with a high-speed rotary air connector (40). The interior of the chuck shaft (20) has an air expansion channel (21) that connects the high-speed rotary air connector (40) and the air expansion head (30). The chuck shaft (20) is fitted with a chuck rotating shaft (50), and the chuck shaft (20) and the chuck rotating shaft (50) are axially limited and circumferentially rotatable. The chuck shaft (50) is axially slidably disposed within the cylinder body (10) and a sliding cavity (11) is formed between the two; the outer circumferential surface of the chuck shaft (50) has an annular partition (51) along its circumferential direction, the annular partition (51) dividing the sliding cavity (11) between the cylinder body (10) and the chuck shaft (50) into a first cavity (12) and a second cavity (13); the cylinder body (10) is respectively provided with a first air hole (14) communicating with the first cavity (12) and a second air hole (15) communicating with the second cavity (13); The cylinder body (10) is also provided with a drive wheel (60) for driving the chuck shaft (20) to rotate.
2. The telescopic air-expanding chuck according to claim 1, characterized in that, The chuck shaft (20) and the chuck rotating shaft (50) are rotatably connected by a first bearing assembly (70), the first bearing assembly (70) including tapered roller bearings (71) and deep groove ball bearings (72) located at both ends of the chuck rotating shaft (50); The chuck shaft (20) is fitted with a bearing inner sleeve (73); the two ends of the bearing inner sleeve (73) abut against the inner side of the tapered roller bearing (71) and the inner side of the deep groove ball bearing (72), respectively. One end of the chuck shaft (50) is fixedly provided with a front pressure cover (74) that abuts against the outer side of the tapered roller bearing (71); the other end of the chuck shaft (50) is fixedly provided with a rear pressure cover (75) that abuts against the outer side of the deep groove ball bearing (72).
3. The telescopic air-expansion chuck according to claim 2, characterized in that, The two ends of the bearing inner spacer (73) respectively abut against the inner side surface of the inner ring of the tapered roller bearing (71) and the inner side surface of the inner ring of the deep groove ball bearing (72); a first abutting step (22) is provided on the chuck shaft (20) on the outer side of the inner ring of the tapered roller bearing (71); a lock nut (76) and a nut retainer (77) are provided on the chuck shaft (20) on the outer side of the inner ring of the deep groove ball bearing (72); A second abutting step (52) is provided on the chuck shaft (50) on the inner side of the outer ring of the tapered roller bearing (71); a third abutting step (53) is provided on the chuck shaft (50) on the inner side of the outer ring of the deep groove ball bearing (72); the front pressure cover (74) abuts against the outer side of the outer ring of the tapered roller bearing (71); and the rear pressure cover (75) abuts against the outer side of the outer ring of the deep groove ball bearing (72).
4. The telescopic air-expansion chuck according to claim 3, characterized in that, A first dustproof ring (78) is provided between the outer side of the inner ring of the tapered roller bearing (71) and the first abutment step (22); a second dustproof ring (79) is provided between the side of the front pressure cover (74) and the outer peripheral surface of the chuck shaft (20).
5. The telescopic air-expanding chuck according to claim 1, 2, 3, or 4, characterized in that, The cylinder block (10) includes a front cylinder head (16), a rear cylinder head (17), and a flange sleeve (18); the flange sleeve (18) is located between the front cylinder head (16) and the rear cylinder head (17), one end of the flange sleeve (18) is fixedly connected to the front cylinder head (16), and the other end of the flange sleeve (18) is fixedly connected to the rear cylinder head (17); The first air hole (14) is provided on the front cylinder head (16) and a first speed control valve (90) is provided at the first air hole (14) of the front cylinder head (16); the second air hole (15) is provided on the rear cylinder head (17) and a second speed control valve (100) is provided at the second air hole (15) of the rear cylinder head (17).
6. The telescopic air-expanding chuck according to claim 5, characterized in that, The sliding cavity (11) is located between the front cylinder head (16) and the rear cylinder head (17). The outer peripheral surface of the annular partition (51) is slidably connected to the inner wall of the flange sleeve (18). A wear-resistant ring (110) and a first sealing ring (120) are provided between the outer peripheral surface of the annular partition (51) and the inner wall of the flange sleeve (18). A first cylinder bushing (130) is provided between the inner wall of the front cylinder head (16) and the outer peripheral surface of the chuck shaft (50), and a second cylinder bushing (140) is provided between the inner wall of the rear cylinder head (17) and the outer peripheral surface of the chuck shaft (50).
7. The telescopic air-expanding chuck according to claim 1, 2, 3, or 4, characterized in that, The drive wheel (60) is located at the end of the cylinder body (10) away from the air expansion head (30). The drive wheel (60) and the end of the cylinder body (10) are rotatably connected by a second bearing assembly (80). The drive wheel (60) has a mounting hole (61) in the middle. The chuck shaft (20) passes through the mounting hole (61) of the drive wheel (60) and the two are circumferentially limited and axially slidably connected.
8. The telescopic air-expansion chuck according to claim 7, characterized in that, The second bearing assembly (80) includes a turntable bearing (81); the drive wheel (60) has a mounting groove (62) on the side facing the cylinder body (10), the turntable bearing (81) is located in the mounting groove (62), the outer ring of the turntable bearing (81) is fixedly connected to the drive wheel (60), and the inner ring of the turntable bearing (81) is fixedly connected to the end of the cylinder body (10); The outer peripheral surface of the chuck shaft (20) is connected to the wall of the mounting hole (61) of the drive wheel (60) by a spline.
9. The telescopic air-expanding chuck according to claim 1, 2, 3, or 4, characterized in that, The air expansion channel (21) runs through both ends of the chuck shaft (20) along the central axis of the chuck shaft (20). The end of the chuck shaft (20) is fixedly connected to the air expansion head (30), and the air expansion channel (21) is connected to the air passage of the air expansion head (30). A second sealing ring (150) is provided between the end face of the chuck shaft (20) and the connecting surface of the air expansion head (30).
10. The telescopic air-expanding chuck according to claim 6, characterized in that, A third sealing ring (160) is provided between one end of the flange sleeve (18) and the front cylinder head (16), and a fourth sealing ring (170) is provided between the other end of the flange sleeve (18) and the rear cylinder head (17); a fifth sealing ring (180) is provided between the inner wall of the front cylinder head (16) and the outer peripheral surface of the chuck shaft (50), and a sixth sealing ring (190) is provided between the inner wall of the rear cylinder head (17) and the outer peripheral surface of the chuck shaft (50).