Speed-regulating PVC heat-shrinkable sleeve traction device

Abstract

The application belongs to the technical field of heat-shrinkable sleeve production traction equipment, and particularly relates to a speed-regulating PVC heat-shrinkable sleeve traction device, which comprises a base, two matching blocks, a compression roller and a traction roller, the two matching blocks are respectively fixedly installed on the left and right sides above the base, and are internally provided with sliding grooves, sliding blocks are slidably connected in the sliding grooves, a screw rod is attached to the top of one of the sliding blocks, a sliding rod is integrally formed on the top of the other sliding block, the screw rod is threadedly connected in the matching block, and the sliding rod is slidably connected in the matching block. The speed-regulating driving mode of the traditional variable-speed motor + frequency converter is abandoned, a pure mechanical friction speed-regulating structure is adopted, a general motor can be used to complete speed regulation and traction, the structure is simple, the cost is low, and adjustment is convenient; a step-by-step intermittent feeding mode is adopted, heat-shrinkable sleeve stress rebound and cooling setting time are reserved, stretching diameter change and indentation are avoided, the cutting station is accurately stopped, and multiple specifications of soft thin-walled PVC heat-shrinkable sleeves are stably conveyed and produced.

Description

Technical Field

[0001] This invention belongs to the technical field of heat shrink tubing production traction equipment, specifically relating to a speed-regulating PVC heat shrink tubing traction device. Background Technology

[0002] PVC heat shrink sleeves, with their excellent insulation, sealing, corrosion protection, and heat shrinking properties, are widely used in the coating and protection processing of wires and cables, electronic components, and pipeline corrosion protection industries. In the continuous extrusion molding, cooling, shaping, cutting, and winding production line of PVC heat shrink sleeves, the traction device is the core key equipment. It mainly undertakes the functions of uniform speed conveying, step feeding, and positioning conveying of the heat shrink sleeves. The stability of the traction speed, the ease of speed adjustment, and the smoothness of conveying directly determine the dimensional accuracy, appearance quality, and production yield of the finished PVC heat shrink sleeves.

[0003] Currently, most traditional PVC heat shrink tubing traction devices in the industry use variable speed motors and frequency converters to directly drive the traction rollers or tracks to adjust their speed, thus adapting to the conveying speed requirements of heat shrink tubing of different specifications. For example, existing patent document CN218489091U discloses a traction device for heat shrink tubing processing, which uses a variable frequency motor to drive the traction rollers to achieve continuous stepless speed regulation, and adjusts the spacing of the pressure rollers by a screw to adapt to the conveying of heat shrink tubing of different diameters; patent document CN218947851U discloses a heat shrink tubing cutting machine with a traction mechanism, which also uses a variable frequency motor to drive the traction mechanism, and works with the cutting station to achieve continuous adjustment of traction speed and fixed-length cutting control.

[0004] While the two existing traction devices mentioned above can achieve traction speed adjustment, they still have many shortcomings in practical applications: First, the procurement cost of variable speed motors and frequency converters is high, and the entire drive control system has a complex structure. For large-scale use in small and medium-sized PVC heat shrink tubing production lines, the equipment investment cost increases significantly. Second, variable speed motors themselves have a precise structure and many supporting electronic control components, making them susceptible to the effects of workshop dust and humidity during operation, resulting in a high failure rate, difficult maintenance, and high maintenance costs. Third, variable frequency and variable speed motors are prone to generating harmonics and electromagnetic interference during operation, which... It affects the normal operation of precision low-voltage electrical equipment such as temperature control instruments and cutting sensors around the production line. Moreover, the motor heat dissipation effect is poor when running at low speed, which is prone to overheating, overload, and rapid life decay. Fourth, traditional variable speed motor drives are mostly continuous constant speed traction methods. After the PVC heat shrink sleeve is extruded and cooled, there is no time for it to rebound. Continuous traction can easily cause the thin-walled heat shrink sleeve to stretch and change diameter, and the tube wall to be indented and deformed and cracked. When working with the fixed length cutting station, it is impossible to achieve precise stopping, and the finished product size deviation is large, making it difficult to adapt to the stable production needs of soft thin-walled multi-specification PVC heat shrink sleeves.

[0005] Meanwhile, existing conventional mechanical traction speed regulation structures mostly use fixed transmission ratio adjustment, which can only achieve a limited range of speed regulation. This makes it impossible to accurately match the step feeding and intermittent stopping requirements of heat shrink sleeves under different production conditions, resulting in low adjustment accuracy and poor adaptability. Therefore, there is an urgent need to develop a PVC heat shrink sleeve traction device that is simple in structure, requires no variable speed motor drive, offers convenient and precise speed regulation, and can achieve step intermittent traction. This would reduce equipment manufacturing and maintenance costs while improving the stability of heat shrink sleeve conveying and the quality of finished product processing. Summary of the Invention

[0006] The purpose of this invention is to provide a speed-adjustable PVC heat shrink sleeve traction device to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a speed-adjustable PVC heat shrink sleeve traction device, comprising a base, two blocks, a pressure roller, and a traction roller. The two blocks are respectively fixedly installed on the upper left and right sides of the base, and have internal sliding grooves. Slider blocks are slidably connected in the sliding grooves. A screw is attached to the upper part of one slider, and a sliding rod is integrally formed on the upper part of the other slider. The screw is threaded into the block, and the sliding rod is slidably connected into the block. A spring spring is provided at the bottom of each slider. The pressure roller is rotatably connected between the two sliders. One block has a cavity inside, and a cover plate is bolted to the inner side of the cavity. The traction roller is rotatably connected between the block and the cover plate, and one end of the traction roller is located in the cavity. An output shaft is rotatably connected to the left side of the cavity, and a roller is provided on the output shaft. A cone is integrally formed at one end of the traction roller, and the outer surface of the cone is in contact with the outer surface of the roller. The output shaft is fixedly connected to the output end of an external drive motor. An adjustment shaft is connected inside the cover plate.

[0008] The present invention further illustrates that the output shaft includes a drive shaft and a connecting shaft, the roller is composed of three cams, two of which are integrally formed on the outer end of the connecting shaft, and the cams contact the cone after rotation; a boss is provided on the outer side of the drive shaft, and a groove is provided on the inner wall of the connecting shaft, and the drive shaft is slidably connected to the inside of the connecting shaft through the groove and the boss.

[0009] The present invention further illustrates that the drive shaft is fixedly connected to the output end of the external drive motor, and a limit is provided between the left end and the left end of the connecting shaft, and a spring is provided between the limit. The spring is sleeved on the outside of the drive shaft, and the left end of the adjusting shaft is in contact with the right end of the connecting shaft to limit the connecting shaft.

[0010] The present invention further illustrates that the adjusting shaft is threadedly connected inside the cover plate, and its right end extends out of the cover plate.

[0011] The present invention further illustrates that the right end of the drive shaft is integrally formed with a support shaft, wherein a movable groove is provided between the two cams, and the other cam is movably connected in the movable groove, the inner wall of the middle cam is integrally formed with a sliding shaft, the inner end of the sliding shaft is integrally formed with a sleeve, the inside of the connecting shaft is provided with a sliding groove, and the sliding shaft is slidably connected in the sliding groove.

[0012] The present invention further illustrates that the middle cam is arranged opposite to the other two cams, the sleeve is sleeved on the support shaft, the support shaft is stepped, and the stepped part is provided with rounded corners. The edge of the sleeve is also rounded. The left diameter of the support shaft is smaller than the right diameter. The adjusting shaft is through-shaped, and the support shaft is inserted into the adjusting shaft after the adjusting shaft moves.

[0013] The present invention further explains that the inner side of the right-side block is provided with two interconnected spiral grooves, and a ball bearing is rolled in the spiral groove. The ball bearing is embedded in the right end of the traction roller and the two are rolled in connection.

[0014] The present invention further illustrates that the cone is elastic.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: It adopts a pure mechanical friction speed regulation structure, eliminating the need for a variable speed motor and frequency converter, and can be driven by a regular motor, significantly reducing equipment procurement and investment costs; at the same time, it avoids the drawbacks of variable speed motors, such as complex structure, high failure rate, electromagnetic interference, easy overheating at low speed, and difficult maintenance. To achieve step-by-step conveying and improve product quality, the traction rollers are driven by intermittent friction between the cam and the cone to form a step-by-step alternating conveying, which allows time for stress rebound and cooling and shaping of PVC heat shrink sleeves. This effectively prevents stretching and diameter change, tube wall indentation and tearing caused by continuous traction, and is suitable for the production of thin-walled soft heat shrink sleeves. The speed adjustment is convenient and precise, and it has a wide range of applications. The cam position can be finely adjusted axially by adjusting the shaft, and the friction transmission ratio can be changed to achieve smooth speed adjustment. It is easy to operate and can match the traction requirements of different production speeds and different specifications of PVC heat shrink sleeves. It can also be used with the cutting station to achieve precise stop cutting, and has strong production adaptability. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the component of the present invention; Figure 3This is the front view of the present invention; Figure 4 This is an exploded view of the components, traction shaft, and cover plate of the present invention. Figure 5 This is a schematic diagram showing the positional relationship between the connecting shaft and the cone cylinder of the present invention; Figure 6 This is a plan view of the output shaft, adjustment shaft, and cover plate of the present invention; Figure 7 This is a cross-sectional view of the connecting shaft of the present invention; Figure 8 This is an exploded view of the internal structure of the connecting shaft of the present invention; In the diagram: 1. Base; 2. Block; 21. Slider; 22. Spring; 23. Spiral groove; 231. Ball bearing; 3. Pressure roller; 4. Traction roller; 41. Conical cylinder; 42. Drive shaft; 421. Support shaft; 43. Connecting shaft; 44. Cam; 441. Sliding shaft; 442. Sleeve; 45. Spring; 5. Cover plate; 51. Adjusting shaft. Detailed Implementation

[0017] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-8 The present invention provides a technical solution: a speed-adjustable PVC heat shrink sleeve traction device, including a base 1, two supporting blocks 2, a pressure roller 3 and a traction roller 4. The two supporting blocks 2 are respectively fixedly installed on the upper left and right sides of the base 1, and are provided with sliding grooves inside. Slider 21 is slidably connected in the chute. A screw is attached to the top of one slider 21, and a slide rod is integrally formed on the top of the other slider 21. The screw is threaded into the assembly block 2, and the slide rod is slidably connected into the assembly block 2. A spring spring 22 is provided at the bottom of each slider 21. The pressure roller 3 is rotatably connected between the two sliders 21. One of the components 2 has a cavity inside, and a cover plate 5 is bolted to the inside of the cavity. The traction roller 4 is rotatably connected between the component 2 and the cover plate 5, and one end of the traction roller 4 is located in the cavity. An output shaft is rotatably connected to the left side of the cavity, and a roller is provided on the output shaft. A cone 41 is integrally formed at one end of the traction roller 4. The outer surface of the cone 41 is in contact with the outer surface of the roller. The output shaft is fixedly connected to the output end of an external drive motor. An adjustment shaft 51 is connected inside the cover plate 5. The PVC heat shrink sleeve passes between the pressure roller 3 and the traction roller 4 and is introduced into the winding device or other equipment. During production, the PVC heat shrink sleeve is pulled. The operator rotates the screw, which pushes the slider 21 downward through the threaded transmission, causing the spring spring 22 to deform under force. The movement of the slider 21 drives the pressure roller 3 downward, reducing the distance between the traction roller 4 and the pressure roller 3, thereby stabilizing the PVC heat shrink sleeve and facilitating subsequent smooth pulling of the PVC heat shrink sleeve. During the pulling process, the external drive motor runs, driving the roller to roll through the output shaft. The friction between the roller and the cone cylinder 41 drives the traction roller 4 to rotate, pulling the PVC heat shrink sleeve. At the same time, the operator can adjust the roller through the adjusting shaft 51. The position causes friction between the roller and the cone 41, changing the rotation speed of the cone 41 to achieve speed regulation. Compared to adjusting with a variable speed motor, this method can use a regular motor, which is cheaper and can be used in large quantities. Variable speed motors have a more complex structure, a higher failure rate, higher requirements for the installation environment, electromagnetic interference that can affect surrounding equipment, poor heat dissipation at low speeds, and are prone to overheating. They also have high maintenance costs and require skilled electricians. Furthermore, they are not cost-effective in all operating conditions. If the equipment runs at a fixed speed year-round, using a variable speed motor is a complete waste, costing more money and increasing the likelihood of failures. Therefore, this speed regulation method, compared to directly using a variable speed motor, ensures convenient speed regulation while reducing costs.

[0019] The output shaft includes a drive shaft 42 and a connecting shaft 43. The roller is composed of three cams 44, two of which are integrally formed on the outer end of the connecting shaft 43. After the cams 44 rotate, they contact the cone 41. A boss is provided on the outer side of the drive shaft 42, and a groove is provided on the inner wall of the connecting shaft 43. The drive shaft 42 is slidably connected to the inside of the connecting shaft 43 through the groove and the boss.

[0020] The drive shaft 42 is fixedly connected to the output end of the external drive motor, and a limit is provided between the left end and the left end of the connecting shaft 43. A spring 45 is provided between the limit and the limit. The spring 45 is sleeved on the outside of the drive shaft 42. The left end of the adjusting shaft 51 is in contact with the right end of the connecting shaft 43 to limit the connecting shaft 43. An external drive motor drives the drive shaft 42 to rotate. The drive shaft 42 drives the connecting shaft 43 to rotate via a boss and a groove, thereby driving the three cams 44 to rotate synchronously. Two of the cams 44 rotate and then contact the cone 41, and then disengage from it. The contact between the cone 41 and the cams 44 generates friction, which drives the cone 41 to rotate, and in turn drives the traction roller 4 to rotate, thus pulling the PVC heat shrink sleeve. After pulling a certain distance, two of the cams 44 disengage from the cone 41, and the traction roller 4 stops rotating until the other cam 44 contacts the cone 41, driving the traction roller 4 to rotate again, so that... The traction roller 4 rotates in a step-by-step manner to traction the PVC heat shrink tubing. It adopts an intermittent step-by-step feeding method, which allows the PVC heat shrink tubing to be transported alternately by moving and stopping. This allows time for stress rebound and cooling and shaping, avoiding stretching and diameter changes and tube wall indentations caused by continuous traction. When the PVC heat shrink tubing is not being wound up but cut, it works with the cutting station to achieve precise cutting at the stop point, improving the dimensional accuracy and appearance quality of the finished product. It is suitable for the smooth transport and production of various specifications of soft thin-walled heat shrink tubing and can be used for traction in most PVC heat shrink tubing production operations, making it widely applicable.

[0021] The adjusting shaft 51 is threaded into the cover plate 5, and its right end extends out of the cover plate 5; When it is necessary to adjust the rotation speed of the traction roller 4 to adjust the traction speed, the operator only needs to rotate the adjusting shaft 51 to move it through the threaded part. Its left end abuts against the connecting shaft 43, causing it to move relative to the drive shaft 42. At this time, after the cam 44 moves parallel, the positional relationship between it and the cone 41 changes. When it rubs against the outer surface of the cone 41, the speed of the cone 41 changes, thus achieving the purpose of speed adjustment. This can prevent the PVC heat shrink sleeve from being stretched too much and breaking, thus protecting the quality of the PVC heat shrink sleeve. The operation is relatively convenient and efficient, the structure is relatively simple, and the manufacturing cost is low. When the adjusting shaft 51 moves to the left, the cam 44 moves to the left, and the rotation speed of the traction roller 4 slows down. Conversely, when the adjusting shaft 51 moves to the right, the rotation speed of the traction roller 4 speeds up. The reaction force generated by the deformation of the spring 45 allows the connecting shaft 43 to move smoothly to the right and reset.

[0022] The right end of the drive shaft 42 is integrally formed with a support shaft 421, in which a movable groove is provided between two cams 44, and another cam 44 is movably connected in the movable groove. The inner wall of the middle cam 44 is integrally formed with a sliding shaft 441, and the inner end of the sliding shaft 441 is integrally formed with a sleeve 442. The inside of the connecting shaft 43 is provided with a sliding groove, and the sliding shaft 441 is slidably connected in the sliding groove.

[0023] The intermediate cam 44 is arranged opposite to the other two cams 44. The sleeve 442 is sleeved on the support shaft 421. The support shaft 421 is stepped and the stepped part is rounded. The edge of the sleeve 442 is also rounded. The left diameter of the support shaft 421 is smaller than the right diameter. The adjusting shaft 51 is through-hole. After the adjusting shaft 51 moves, the support shaft 421 is inserted into the adjusting shaft 51. When the speed of subsequent winding or discharge of PVC heat shrink sleeve is relatively fast, the speed of the traction roller 4 is increased. The drive shaft 42 supports the sleeve 442 through the support shaft 421, thereby stabilizing the middle cam 44 through the sliding shaft 441, so that the other two cams 44 are set opposite to the middle cam 44. When the connecting shaft 43 rotates, the three cams 44 rotate synchronously and can contact and rub against the cone 41 to increase the stepping frequency and further increase the speed of conveying PVC heat shrink sleeve, thereby improving production efficiency. When the speed of subsequent winding or discharge of the PVC heat shrink sleeve is slow, the speed of the traction roller 4 is slowed down. At this time, the cam 44 contacts and rubs against the left end of the cone 41. At the same time, after the relative movement between the support shaft 421 and the connecting shaft 43, the sleeve 442 moves to the left end of the support shaft 421. The sleeve 442 loses support, so the middle cam 44 can move up, down, left and right. At this time, the connecting shaft 43 rotates. Only two cams 44 can contact and rub against the cone 41. Although the other cam 44 can also rub against the cone 41, the friction is not enough to drive the cone 41 to rotate, thereby reducing the stepping frequency. The speed control precision is higher, which can fully prevent the PVC heat shrink sleeve from being stretched, deformed or even broken, and the protection performance is better. Moreover, when manually adjusting the speed, the speed adjustment precision and stepping frequency are automatically controlled, and the operation is simple and not complicated.

[0024] The right-side block 2 has two interconnected spiral grooves 23 inside, and a ball bearing 231 is rolled inside the spiral groove 23. The ball bearing 231 is embedded in the right end of the traction roller 4 and the two are rolled together.

[0025] The cone 41 is elastic; During the traction process, the cone 41 and the cam 44 rub against each other, while the right end of the traction roller 4 rolls in the spiral groove 23 through the ball 231, thereby generating axial force, which allows the traction roller 4 to move left and right slightly. When the cone 41 and the cam 44 come into contact and squeeze and rub against each other, the squeezing strength between the two increases and the friction increases, which allows the traction roller 4 to rotate smoothly, so as to avoid poor contact due to wear. This can greatly improve the structural strength and service life. When the cone 41 is squeezed, it can deform and then return to its original shape, reducing structural wear, further improving the service life of the structure, and reducing the maintenance frequency. Meanwhile, by removing the cover plate 5, the internal structure can be quickly maintained or replaced, making the operation convenient.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A speed-regulating PVC heat shrink sleeve traction device, comprising a base (1), two supporting blocks (2), a pressure roller (3), and a traction roller (4), characterized in that: The two blocks (2) are fixedly installed on the upper left and right sides of the base (1) respectively, and are provided with sliding grooves inside; One of the components (2) has a cavity inside, and a cover plate (5) is bolted to the inside of the cavity. The traction roller (4) is rotatably connected between the component (2) and the cover plate (5), and one end of the traction roller (4) is located inside the cavity. An output shaft is rotatably connected to the left side of the cavity, and a roller is provided on the output shaft. One end of the traction roller (4) is integrally formed with a cone (41), and the outer surface of the cone (41) is in contact with the outer surface of the roller. The output shaft is fixedly connected to the output end of an external drive motor. An adjusting shaft (51) is connected inside the cover plate (5). The output shaft includes... The drive shaft (42) and the connecting shaft (43) are provided. The roller is composed of three cams (44). The right end of the drive shaft (42) is integrally formed with a support shaft (421). A movable groove is provided between two of the cams (44), and another cam (44) is movably connected in the movable groove. The inner wall of the middle cam (44) is integrally formed with a sliding shaft (441). The inner end of the sliding shaft (441) is integrally formed with a sleeve (442). The sleeve (442) is sleeved on the support shaft (421). The support shaft (421) is stepped, and the stepped part is provided with rounded corners.

2. The speed-regulating PVC heat shrink sleeve traction device according to claim 1, characterized in that: Each of the slide grooves is slidably connected to a slider (21). A screw is attached to the top of one of the sliders (21), and a slide rod is integrally formed on the top of the other slider (21). The screw is threaded into the assembly block (2), and the slide rod is slidably connected into the assembly block (2). Each slider (21) is provided with a spring spring (22) at the bottom. The pressure roller (3) is rotatably connected between the two sliders (21). Two cams (44) are integrally formed on the outer end of the connecting shaft (43). After the cams (44) rotate, they contact the cone (41). The drive shaft (42) has a boss on its outer side and a groove on the inner wall of the connecting shaft (43). The drive shaft (42) is slidably connected to the inside of the connecting shaft (43) through the groove and the boss. The drive shaft (42) is fixedly connected to the output end of the external drive motor. A limit is provided between the left end and the left end of the connecting shaft (43). A spring (45) is provided between the limit and the limit. The spring (45) is sleeved on the outer side of the drive shaft (42). The left end of the adjusting shaft (51) is in contact with the right end of the connecting shaft (43) to limit the connecting shaft (43). The adjusting shaft (51) is threaded into the cover plate (5) and the right end extends out of the cover plate (5).

3. The speed-regulating PVC heat shrink sleeve traction device according to claim 2, characterized in that: The connecting shaft (43) has a sliding groove inside, and the sliding shaft (441) is slidably connected in the sliding groove.

4. The speed-regulating PVC heat shrink sleeve traction device according to claim 3, characterized in that: The middle cam (44) is set opposite to the other two cams (44), the edge of the sleeve (442) is also rounded, the left diameter of the support shaft (421) is smaller than the right diameter, the adjustment shaft (51) is through, and after the adjustment shaft (51) moves, the support shaft (421) is inserted into the adjustment shaft (51).

5. A speed-regulating PVC heat shrink sleeve traction device according to claim 4, characterized in that: The right-side block (2) has two interconnected spiral grooves (23) inside. A ball (231) is rolled inside the spiral groove (23). The ball (231) is embedded in the right end of the traction roller (4) and the two are rolled together.

6. The speed-regulating PVC heat shrink sleeve traction device according to claim 5, characterized in that: The cone (41) is elastic.

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