Pneumatic type collet assembly

Abstract

The application relates to a pneumatic type tensioning chuck assembly which is composed of a driving shaft and a chuck. The driving shaft comprises a shaft body, a detachable tail cover, a cylinder piston and a connecting rod. The tail cover and the shaft body form a piston moving space. The connecting rod transmits the piston movement to the top taper head. The chuck comprises a first main body, a second main body, a sliding block and a supporting block. The sliding block slope is consistent with the taper of the taper head. The movement of the top taper head is converted into the movement of the sliding block. The force is uniformly transmitted through the abutting of the supporting block to drive the pipe core to rotate. The assembly is also optimized in multiple structures: the telescopic rubber ring buffers the impact and automatically resets; the spring assists the piston movement and buffers the limit impact; the dustproof sealing ring guarantees the sealing and the stability of the air pressure; the tail cover gas interface cooperates with the electromagnetic valve to realize the automation; the cylinder piston is provided with a sealing ring and a guide ring; the buffer pad is additionally arranged to reduce the piston impact; the shaft body is provided with a taper head accommodating cavity to optimize the space, position the guide and protect the taper head. The assembly improves the performance, stability and automation degree and reduces the operation and maintenance cost.

Description

Technical Field

[0001] This application relates to the field of winding take-up equipment technology, and in particular to a pneumatic tensioning clamp assembly. Background Technology

[0002] In the field of winding operations, the chuck, as a key component, determines the winding quality and production efficiency. Currently, sliding chucks theoretically possess the ability to stably tension the core and are widely used in related production equipment. In basic core tensioning operations, they can initially achieve core fixation and rotational drive, meeting winding operations with certain precision requirements. However, in actual production, sliding chucks still reveal some problems that need to be addressed. On the one hand, fluctuations in winding tension, and the acceleration and deceleration of winding during production pose challenges to the stability of sliding chucks. Especially during the deceleration phase, the winding tension decreases, the torque of the drive motor decreases accordingly, and this leads to a decrease in the torque of the chuck's rotating shaft. This reduces the outward thrust of the chuck tensioning block, ultimately causing slippage and movement between the chuck and the core. This disrupts the neatness and tightness of the winding, resulting in abnormal winding quality and affecting subsequent processing and use of the product.

[0003] On the other hand, with prolonged use, wear and tear on the chuck's rotating shaft is inevitable. Wear on the rotating shaft increases the roundness and runout of the chuck after tensioning, making it unable to meet the stringent requirements for full runout. This reduces the accuracy of core winding and may also cause equipment vibration, increased noise, and other problems, shortening the equipment's lifespan and increasing safety hazards and maintenance costs during production. Utility Model Content

[0004] The purpose of this application is to provide a pneumatic tensioning clamp assembly that prevents relative slippage between the core and the clamp, thus avoiding defects caused by tension fluctuations. This purpose is achieved through the following technical solution: the pneumatic tensioning clamp assembly of this application includes a drive shaft and a clamp.

[0005] The drive shaft includes a shaft body, a tail cover, a cylinder piston, and a connecting rod. The tail cover is connected to the shaft body, forming a space for the piston to move within the shaft body. One end of the connecting rod is connected to the cylinder piston, and the other end passes through the shaft body and is connected to the top cone.

[0006] The card head includes a first body, a second body, multiple support blocks, and multiple sliders. The first body is fixedly connected to the shaft. The second body includes a limiting ring. The first body and the second body are fixedly connected together. The limiting ring includes multiple limiting grooves corresponding to the sliders.

[0007] The slider has a sloping structure at one end, with the sloping angle being the same as that of the top cone.

[0008] In one embodiment, a telescopic rubber ring is also included, which surrounds the support block.

[0009] In one embodiment, a spring is also included, which is sleeved on the connecting rod, with one end abutting against the cylinder piston and the other end abutting against the shaft.

[0010] In one embodiment, a sealing dust ring is also included, which is disposed on the connecting rod, and the shaft body includes a sealing dust ring receiving groove.

[0011] In one embodiment, the tail cap further includes a gas port connected to a pneumatic rotary joint.

[0012] In one embodiment, a solenoid valve is also included.

[0013] In one embodiment, the first body and the second body are screwed together, with the screw passing through the limiting ring.

[0014] In one embodiment, the cylinder piston includes a sealing ring and a guide ring.

[0015] In one embodiment, the cylinder piston also includes a buffer pad.

[0016] In one embodiment, the shaft also includes a cone-shaped receiving cavity.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] The pneumatic tensioning clamp assembly of this application achieves tensioning through a pneumatic drive structure. The cylinder piston in the drive shaft moves under air pressure, driving the connecting rod and the top cone to move. Since the inclined angle of the inclined surface structure at one end of the slider in the clamp is consistent with the inclined angle of the top cone, the movement of the top cone will cause the slider to be pushed outward along the limiting groove in the limiting ring, thereby pushing the support block to tightly press against the inner wall of the core. This ensures that the core and the clamp do not slip relative to each other during the winding process, whether there are tension fluctuations, winding speed increase or decrease, etc., avoiding abnormal winding quality problems caused by slippage and improving the stability and reliability of the winding operation.

[0019] This application achieves a high level of performance in the industry by ensuring machining precision in its structural design, allowing the runout of the chuck during operation to be controlled within 3 microns. Surface treatment of the cone and slider materials improves the wear resistance of the components, ensuring long-term accuracy even after frequent friction and wear during extended use. This extends the service life of the chuck assembly and reduces the frequency of replacements and maintenance costs due to component wear.

[0020] Furthermore, the sealing and dustproof performance is further optimized through a sealing dustproof ring. A buffer pad on the cylinder piston reduces the impact force between the piston and the tail cover. The gas interface on the tail cover connects to the pneumatic rotary joint, facilitating the connection between the pneumatic system and an external air source. The telescopic rubber ring surrounding the support block has an adjustable telescopic function, automatically returning the slider to its original position when the connecting rod retracts. This eliminates the need for other components, simplifying the mechanical structure, improving the automation level and ease of operation, and making the overall structural design more compact and rational. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the drive shaft portion in the pneumatic tensioning clamp assembly of this application;

[0022] Figure 2 This is an exploded structural diagram of the clamping head portion in the pneumatic tensioning clamping head assembly of this application;

[0023] Figure 3 This is a schematic diagram of the overall structure of the pneumatic tensioning clamp assembly of this application.

[0024] Explanation of reference numerals in the attached drawings: 100, drive shaft; 110, shaft body; 111, cone head receiving cavity; 120, tail cover; 121, gas interface; 130, cylinder piston; 131, sealing ring; 132, guide ring; 133, buffer pad; 140, connecting rod; 150, top cone head; 160, spring; 170, sealing dust ring; 200, chuck; 210, first body; 220, second body; 221, limiting ring; 230, support block; 240, slider; 250, telescopic rubber ring; 260, receiving groove. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0026] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Core winding operations are present in numerous industries, such as cable manufacturing, film production, and paper processing. The quality of winding directly affects the subsequent processing, storage, and final performance of the product. As a key component in the core winding process, the clamping head, while theoretically capable of tensioning the core using traditional sliding clamping heads, inevitably experiences tension fluctuations and frequent changes in winding speed during actual production. This can lead to slippage and movement between the clamping head and the core, resulting in abnormal winding quality. Over time, the wear of critical internal components of the clamping head becomes severe, increasing the roundness and runout after tensioning. To address these problems with traditional sliding clamping heads, this application provides a pneumatic tensioning clamping head assembly. The core and clamping head are fixedly connected, preventing relative slippage. The specific structure and technical features of this pneumatic tensioning clamping head assembly will be described in detail below. Please refer to... Figures 1 to 3 As shown, a pneumatic tensioning clamp 200 assembly in a preferred embodiment of this application includes a drive shaft 100 and a clamp 200:

[0029] The drive shaft 100 includes a shaft body 110, a tail cover 120, a cylinder piston 130, and a connecting rod 140. The tail cover 120 is connected to the shaft body 110, and a space for piston movement is formed in the shaft body 110. One end of the connecting rod 140 is connected to the cylinder piston 130, and the other end passes through the shaft body 110 and is connected to the top cone 150.

[0030] The card head 200 includes a first body 210, a second body 220, a plurality of support blocks 230 and a plurality of sliders 240. The first body 210 is used to be fixedly connected to the shaft 110. The second body 220 includes a limiting ring 221. The first body 210 and the second body 220 are fixedly connected together. The limiting ring 221 includes a plurality of limiting grooves corresponding to the sliders 240 respectively.

[0031] The slider 240 has a sloping structure at one end, and the sloping angle is the same as the sloping angle of the top cone 150.

[0032] The drive shaft 100 includes a shaft body 110, a tail cover 120, a cylinder piston 130, and a connecting rod 140. The tail cover 120 is independently designed and is firmly fixed to one end of the shaft body 110 with screws, allowing for quick disassembly and installation. When the tail cover 120 is connected to the shaft body 110, a relatively sealed and independent space is formed inside the shaft body 110. The cylinder piston 130 is located in the space formed inside the shaft body 110. One end of the connecting rod 140 is tightly connected to the cylinder piston 130, and the other end passes through the shaft body 110 and is connected to the top cone 150. The linear motion of the cylinder piston 130 can be transmitted to the top cone 150.

[0033] The chuck 200 structure consists of a first body 210, a second body 220, multiple support blocks 230, and multiple sliders 240. The first body 210 serves as a connecting component between the chuck 200 and the drive shaft 100, and is used to fix it to the shaft 110 to ensure the relative position between the chuck 200 and the drive shaft 100 is stable. The second body 220 is provided with a limit ring 221. The first body 210 and the second body 220 are connected together by a reliable fixing method to form a complete chuck 200 structure. The limiting ring 221 includes multiple limiting grooves corresponding to the slider 240. These limiting grooves, the first body 210, and the second body 220 together restrict the slider 240 to slide only along a direction perpendicular to the connecting rod 140. One end of each slider 240 is designed as a bevel, and the inclination angle of this bevel is consistent with the inclination angle of the top cone 150, meaning the cone and the slider 240 have the same taper. The linear motion of the cylinder piston 130 is transmitted to the top cone 150 via the connecting rod 140. When the cone of the drive shaft 100 is pushed out, because its taper is consistent with the taper of the bevel structure of the slider 240, the cone can achieve a tight fit with the slider 240, uniformly transmitting force to the slider 240 during the pushing process, allowing the slider 240 to slide radially. The support block 230 can directly abut against the core, thereby enabling the clamp 200 to drive the core to rotate.

[0034] In a further embodiment, a telescopic rubber ring 250 is also included, which surrounds the support block 230. The slider 240 slides radially under the push of the top cone 150, thereby pushing the expansion support block 230 outward. With the telescopic rubber ring 250 present, the expansion support block 230 expands the telescopic rubber ring 250 surrounding it during movement, causing the telescopic rubber ring 250 to fit tightly against the inner wall of the core, enabling it to withstand greater winding tension. Furthermore, due to the elasticity of the telescopic rubber ring 250, it can buffer the impact force during the winding process to a certain extent.

[0035] After the work is completed, by switching the solenoid valve to the exhaust mode, the cylinder piston 130 retracts under the action of the internal spring 160 or external air pressure, driving the top cone 150 to retract as well. At this time, the telescopic rubber ring 250 on the chuck 200, with its own elasticity, presses the slider 240 and the expansion support block 230 back to their initial positions, so that the chuck 200 returns to its untightened state, and the core can be easily removed. The automatic reset function improves production efficiency and reduces the workload and errors of manual operation.

[0036] The pneumatic tensioning chuck 200 assembly further includes a spring 160, which is sleeved onto the connecting rod 140. One end of the spring abuts against the cylinder piston 130, and the other end abuts against a corresponding position on the shaft 110. Throughout the operation of the chuck 200 assembly, the spring 160 remains in a proper working state, cooperating with the cylinder piston 130, connecting rod 140, and shaft 110. When the pneumatic tensioning chuck 200 assembly is working, the cylinder piston 130 moves outward under air pressure, pushing the connecting rod 140 and the top cone 150, thereby achieving the tensioning operation of the chuck 200 on the core. When the work is completed and the core needs to be released, the air pressure disappears or switches. At this time, the spring 160, relying on its accumulated elastic potential energy, can quickly and smoothly push the cylinder piston 130 back to its initial position. During the movement of the cylinder piston 130, especially when it reaches its limit position, a large impact force may be generated due to inertia or sudden changes in air pressure. The spring 160, sleeved on the connecting rod 140, can act as a buffer when the piston moves to its limit position. During installation, simply sleeve the spring 160 accurately on the connecting rod 140 and adjust its contact position with the cylinder piston 130 and the shaft 110.

[0037] In addition, a sealing dust ring 170 is further configured, and a specially designed receiving groove 260 for the sealing dust ring 170 is located at the corresponding position on the shaft 110. The size and shape of the receiving groove 260 match the sealing dust ring 170. When the sealing dust ring 170 is installed on the connecting rod 140 and embedded in the receiving groove 260 of the shaft 110, the two form a sealing structure, effectively preventing the intrusion of external dust, impurities, and liquids, ensuring the stability of the chuck 200 assembly. The sealing dust ring 170, set on the connecting rod 140 and embedded in the receiving groove 260 of the shaft 110, can effectively prevent dust from entering the interior of the assembly, ensuring the cleanliness of the surfaces of each moving part. The pneumatic tensioning chuck 200 assembly relies on the air pressure in the cylinder to drive the piston movement, thereby realizing the tensioning and loosening operation of the chuck 200. If there is a gap between the connecting rod 140 and the shaft 110, it will cause gas leakage in the cylinder, causing the pressure in the cylinder to drop, which will not provide enough power to drive the piston movement, affecting the normal operation of the chuck 200. The 170 sealing dust ring reduces gas leakage and ensures stable pressure inside the cylinder.

[0038] In addition to basic connection and sealing functions, the tail cap 120 is designed with an additional gas interface 121, which is compatible with the pneumatic rotary joint to form a reliable gas transmission channel. During operation, the solenoid valve acts as a control element, regulating the flow and on / off of compressed air. Compressed air enters orderly through the gas interface 121 of the tail cap 120, and along the pre-designed air passage, pushes the piston in the cylinder. The piston moves linearly under the force of the compressed air, and then transmits the power to the top cone 150 through the connecting rod 140, ultimately causing the top cone 150 to push out according to the preset requirements, realizing the tightening operation of the clamp 200 assembly on the tube core.

[0039] The solenoid valve, based on preset electrical control signals, controls the on / off state, flow direction, and flow rate of compressed air, thereby effectively regulating the movement of the cylinder piston 130 and controlling the ejection and retraction of the top cone 150 of the clamp 200. When tensioning the mandrel is required, the solenoid valve can control the timing and flow rate of compressed air entering the cylinder, ensuring the piston smoothly and accurately pushes the top cone 150 out. The solenoid valve, combined with an automated control system, enables the pneumatic tensioning clamp 200 assembly to operate automatically. By writing corresponding control programs, the opening and closing actions of the solenoid valve can be automatically controlled according to different production needs, achieving automatic ejection and retraction of the top cone 150 of the clamp 200. The solenoid valve can be selected and configured according to the specific operating requirements of the pneumatic tensioning clamp 200 assembly.

[0040] The first body 210 and the second body 220 are securely connected by screws. During the connection process, the screws are passed sequentially through corresponding holes pre-set on the limiting ring 221, and then screwed into matching threaded holes on the first body 210 and the second body 220, and tightened to a specified torque, so that the first body 210, the second body 220 and the limiting ring 221 are combined into a whole. The screws tightly connect the first body 210 and the second body 220, enabling them to withstand significant external forces, including forces in various directions such as tension, compression, and shear. During the operation of the pneumatic tensioning chuck 200 assembly, the movement of the cylinder piston 130 generates significant power, and the core also exerts a certain reaction force on the chuck 200 during winding. The screw connection ensures that the first body 210 and the second body 220 will not loosen or separate under these forces. In addition, the screw hole passes through the limiting ring 221, which can simultaneously provide auxiliary fixation for the limiting ring 221, and at the same time, the screw will not be exposed between the first body 210 and the second body 220.

[0041] The cylinder piston 130 is further optimized in design, equipped with a sealing ring 131 and a guide ring 132. The sealing ring 131 is made of high-performance rubber or polytetrafluoroethylene, and its cross-sectional shape ensures a tight fit with the inner wall of the cylinder to form a seal. The guide ring 132 can be made of engineering plastic with good self-lubricating and wear-resistant properties, and is installed in the middle of the cylinder piston 130 to achieve smooth relative sliding. In the pneumatic tensioning chuck 200 assembly, the cylinder relies on compressed air to generate power to drive the piston, thereby realizing the tensioning and loosening operation of the chuck 200. The high-performance sealing ring 131 ensures the stability of the pressure inside the cylinder. The cylinder piston 130 performs reciprocating linear motion inside the cylinder, and the guide ring 132 plays a guiding role, ensuring that the piston always moves along the axis of the cylinder during the movement, avoiding piston deflection and jamming. Compared with a cylinder without a guide ring 132, using a guide ring 132 can extend the service life of the cylinder and piston and reduce the failure rate of the equipment.

[0042] In a further technical solution, a buffer pad 133 can be added, made of a material with good elasticity and wear resistance, such as polyurethane rubber. This buffer pad is installed near the end of the piston stroke of the cylinder piston 130, playing a crucial buffering role when the piston reaches the end of its stroke. During the operation of the pneumatic tensioning chuck 200 assembly, the cylinder piston 130 undergoes high-speed reciprocating linear motion driven by compressed air. When the piston reaches the end of its stroke, without a buffer device, the piston would directly impact the cylinder end cover at a high speed, generating a strong mechanical impact. The presence of the buffer pad 133 allows it to gradually absorb and dissipate the piston's kinetic energy through its elastic deformation as the piston approaches the end of its stroke, transforming the originally strong impact into a gentler buffering process.

[0043] In the structural design of the shaft 110, a conical head receiving cavity 111 can be further added, which is opened at a specific position on the shaft 110. Its shape is a groove structure adapted to the bottom of the top conical head 150, achieving a tight and flexible fit with the top conical head 150. This ensures that the top conical head 150 can extend smoothly when needed and be fully accommodated in the cavity when retracted. This method optimizes the space layout, and the rational use of space is crucial in the pneumatic tensioning clamp 200 assembly. The conical head receiving cavity 111 is directly set on the shaft 110, avoiding the need to set up an additional support structure or movement space for the top conical head 150, making the entire assembly structure more compact and achieving more functions within a limited space. In addition, the conical structure of the cone-shaped receiving cavity 111 can also provide positioning and guidance for the top cone 150. When the top cone 150 extends under the push of the cylinder piston 130, the conical surface of the cone-shaped receiving cavity 111 can guide the top cone 150 to move accurately in a predetermined direction, ensuring that the top cone 150 can be ejected vertically and stably. The positioning and guiding function prevents the top cone 150 from deflecting or shaking during the extension process. When the equipment is not in operation or during transportation, the top cone 150 is housed in the cone-shaped receiving cavity 111, which can protect the top cone 150 and prevent it from being damaged by collision or friction with other objects.

[0044] As described above, the pneumatic tensioning clamp assembly proposed in this application consists of a drive shaft and a clamp. The drive shaft includes a shaft body, a tail cap, a cylinder piston, and a connecting rod. The tail cap is independently designed and firmly connected to the shaft body with screws, forming a relatively sealed independent space within the shaft body for piston movement. The cylinder piston is placed within this space, and one end of the connecting rod is connected to the piston, while the other end passes through the shaft body and connects to the top conical head, transmitting the linear motion of the piston to the top conical head. The clamp includes a first body, a second body, multiple support blocks, and a slider. The first body is used to fix and connect the shaft body, and the second body is provided with a limiting ring. The two are firmly connected by screws. The limiting ring has a limiting groove corresponding to the slider, restricting the slider from sliding in the direction perpendicular to the connecting rod. The inclined structure at one end of the slider has the same inclination angle as the top conical head, achieving a tight fit and uniform force distribution. The support blocks can abut against the tube core and drive it to rotate.

[0045] The component further optimizes several structural features, including the addition of a telescopic rubber ring surrounding the support block. The slider slides radially, pushing the support block to open the rubber ring, ensuring it conforms to the inner wall of the tube core, bearing the winding tension and buffering impact. After operation, the rubber ring rebounds, automatically resetting the chuck. A spring is fitted onto the connecting rod, cooperating with the cylinder piston and shaft. During operation, it assists the piston in pushing the cone head to tighten the tube core; after completion, it uses elastic potential energy to smoothly push the piston back, also buffering impact at the piston's extreme movement positions. A sealing dustproof ring is embedded in a specially designed receiving groove in the shaft, forming a sealed structure to prevent external impurities from entering, reducing gas leakage and ensuring stable component operation. The tail cover adds a gas interface adapted to a pneumatic rotary joint, forming a gas transmission channel. The solenoid valve regulates the compressed air flow direction, on / off state, and flow rate based on electrical control signals, achieving automated component operation. The cylinder piston is equipped with a high-performance sealing ring and guide ring to ensure stable cylinder pressure, guide the piston's linear movement, and extend the equipment's service life. A buffer pad is added near the end of the cylinder piston's stroke to absorb piston kinetic energy and buffer impact. These improvements enhance component performance, stability, and automation, thereby simplifying the structure and reducing maintenance costs.

[0046] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. A pneumatic type collet assembly comprising: Including the drive shaft and chuck: The drive shaft includes a shaft body, a tail cover, a cylinder piston, and a connecting rod. The tail cover is connected to the shaft body, forming a space for the piston to move within the shaft body. One end of the connecting rod is connected to the cylinder piston, and the other end passes through the shaft body and is connected to the top cone. The card head includes a first body, a second body, multiple support blocks, and multiple sliders. The first body is fixedly connected to the shaft. The second body includes a limiting ring. The first body and the second body are fixedly connected together. The limiting ring includes multiple limiting grooves corresponding to the sliders. The slider has a sloping structure at one end, with the sloping angle being the same as that of the top cone.

2. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, It also includes a telescopic rubber ring that wraps around the support block.

3. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, It also includes a spring, which is sleeved on the connecting rod, with one end abutting against the cylinder piston and the other end abutting against the shaft.

4. The pneumatic tensioning clamp assembly according to claim 3, characterized in that, It also includes a sealing dust ring, which is disposed on the connecting rod, and the shaft body includes a sealing dust ring receiving groove.

5. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, The tail cap also includes a gas port, which is connected to a pneumatic rotary joint.

6. The pneumatic tensioning clamp assembly according to claim 5, characterized in that, It also includes solenoid valves.

7. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, The first body and the second body are fixedly connected together by screws, with the screws passing through the limiting ring.

8. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, The cylinder piston includes a sealing ring and a guide ring.

9. The pneumatic tensioning clamp assembly according to claim 8, characterized in that, The cylinder piston also includes a buffer pad.

10. The pneumatic tensioning clamp assembly according to claim 1, characterized in that, The shaft also includes a cone-shaped receiving cavity.

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