Rolling core type bandage pulling-out device with adjustable tension

Abstract

The invention discloses a pulling-force-adjustable roll core type bandage pulling-out device which comprises a shell, a roll core, a pull rod, a pull rod and a pull rod. The fixing piece is fixedly installed in the shell, and a containing hole and a sliding groove are formed in the fixing piece; the rotating part is arranged on the periphery of the fixed part in a sleeving manner; the resistance assembly comprises a fixed ratchet wheel, a sliding ratchet wheel and a compression spring, the fixed ratchet wheel is fixedly connected to the rotating part, the sliding ratchet wheel is arranged in the sliding groove and can move in the length direction of the sliding groove, the fixed ratchet wheel is meshed with the sliding ratchet wheel, and the compression spring is contained in the containing hole and used for providing pressing force facing the fixed ratchet wheel for the sliding ratchet wheel; the adjusting assembly is used for adjusting the pressing force of the pressure spring; the roll core is detachably connected with the rotating piece, and the periphery of the roll core is used for winding a bandage. By means of the device, the consistency of operation of different operators can be guaranteed, it is guaranteed that the binding pressure of each time is kept constant, meanwhile, the pulling force can be adjusted according to different binding parts, and the controllability and safety of treatment are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a roll-up bandage pull-out device with adjustable tension. Background Technology

[0002] Bandages are commonly used medical items in clinical practice for bandaging wounds, securing dressings, or applying pressure. Elastic bandages, due to their good extensibility and resilience, can provide continuous and even pressure to the limb during bandaging, playing an important role in suppressing swelling and promoting healing. However, in actual use, the tightness of the bandage largely depends on the personal experience and subjective judgment of medical personnel. Therefore, it is difficult to quantify and standardize the bandaging pressure, which can easily lead to situations where excessive pressure affects blood circulation in the limb, or insufficient pressure fails to achieve the desired therapeutic effect, posing certain medical risks.

[0003] To overcome these problems, some solutions have been introduced to the market that can determine the level of bandaging pressure by incorporating pressure indicators into the bandage itself. Specifically, specific graphics are printed on the bandage, and when the image is stretched into different specific shapes, it indicates that different levels of tension have been reached. However, this solution is easily affected by viewing angle, the curvature of the bandage, and individual differences in judgment, resulting in low accuracy.

[0004] In addition, existing technologies also provide some devices for assisting in the pulling out of bandages. For example, Chinese patent document CN208435920U discloses an elastic bandage assembly that can display the magnitude of elasticity. It estimates the tensile force by comparing a pressure measuring ruler with specific scale lines with the marking lines on the bandage. Although this solution provides a reference, the reading process still relies on manual comparison and judgment, and cannot achieve direct, digital display and control of the tensile force. Furthermore, it does not solve the problem of potential fluctuations in tensile force during the pulling out process.

[0005] For example, Chinese patent document CN109864853A discloses a visual elastic bandage tension adjustment and force limiting device, which measures and displays the real-time tension of the bandage as it passes through the roller using a sensor. While this device can monitor instantaneous tension, it does not apply a constant resistance torque to the rotation of the bandage roll. Therefore, it cannot control the initial tension of pulling the bandage from the roller to a constant value. The final pressure applied during actual bandaging still largely depends on the operator's hand strength and speed in pulling the bandage. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a tension-adjustable roll-type bandage pull-out device, which can ensure the consistency of operation by different operators, ensure that the pressure of each bandage remains constant, and at the same time, can adjust the tension according to different bandaging sites, thereby improving the controllability and safety of treatment.

[0007] The technical solution adopted by this invention to solve its technical problem is: An adjustable tension roll-type bandage pull-out device, comprising: The outer casing has an outlet for pulling out the bandage, and the outlet is equipped with a guide roller; A fastener is fixedly installed inside the housing, and its interior has a receiving hole and a sliding groove; A rotating component is fitted around the outer periphery of the fixed component; A resistance assembly, disposed between the fixed member and the rotating member, includes a fixed ratchet, a sliding ratchet, and a compression spring. The fixed ratchet is fixedly connected to the rotating member. The sliding ratchet is disposed in the slide groove and can move along the length direction of the slide groove. The fixed ratchet meshes with the sliding ratchet. The compression spring is accommodated in the receiving hole and is used to provide a clamping force to the sliding ratchet toward the fixed ratchet. An adjustment component is used to adjust the clamping force of the compression spring; The core, detachably connected to the rotating component, has its outer periphery used for wrapping bandages.

[0008] As a further improvement to the above technical solution, the inner wall of the outer shell is provided with a first sleeve and a protrusion located inside the first sleeve, and an annular gap is formed between the first sleeve and the protrusion. One end of the fixing member is provided with a second sleeve, the second sleeve is coaxial with the receiving hole, and the second sleeve extends into the annular gap and is fixedly connected to the first sleeve or the protrusion.

[0009] As a further improvement to the above technical solution, the rotating component has a through hole inside, and the fixed ratchet is fixed in the through hole and divided into a first hole segment and a second hole segment. The first hole segment is sleeved on the outer periphery of the first sleeve, and the second hole segment is sleeved on the outer periphery of the fixed component, so that one axial end of the fixed ratchet is limited by the end face of the first sleeve.

[0010] As a further improvement to the above technical solution, the sliding ratchet is provided with a plurality of slide bars arranged in a ring array on one axial side. The number of slide grooves is the same as the number of slide bars and they slide in one-to-one. The plurality of slide grooves pass through the second sleeve and extend axially into the receiving hole. A baffle is provided at the center of the sliding ratchet. One end of the compression spring abuts against the baffle. The baffle has a plurality of clearance openings for the second sleeve to pass through.

[0011] As a further improvement to the above technical solution, the end of the fixing member away from the second sleeve is provided with a second threaded hole, the second threaded hole is coaxial with the receiving hole, the adjusting component includes a stud and an adjusting knob, the adjusting knob is disposed at one end of the stud, the stud is threadedly connected to the second threaded hole, the end of the stud away from the adjusting knob is used to limit one end of the compression spring, and the outer shell is provided with an operating hole corresponding to the adjusting knob.

[0012] As a further improvement to the above technical solution, the fixing member is also provided with a guide hole, the receiving hole, the guide hole and the second threaded hole are connected in sequence and coaxial, the end of the stud away from the adjusting knob is provided with a guide post, the guide post is slidably engaged with the guide hole, one end of the compression spring is provided with a pressure block, and one end of the guide post abuts against the pressure block.

[0013] As a further improvement to the above technical solution, the outer shell includes a housing and a cover. The housing includes an end cap and two arc-shaped pieces. One end of each of the two arc-shaped pieces is fixedly connected to the edge of the end cap. The discharge port is formed between the two arc-shaped pieces. The guide roller is disposed on one side of the arc-shaped pieces. The cover is detachably connected to the other end of the two arc-shaped pieces and is parallel to the end cap. The first sleeve and the protrusion are disposed on the inner wall of the end cap. The operating hole is disposed on the cover.

[0014] As a further improvement to the above technical solution, an arc-shaped flange is provided on the radially outer side of the cover, and two first arc-shaped limiting pieces are provided on the inner wall of the arc-shaped flange. Two second arc-shaped limiting pieces are provided on the inner edge of the cover. The first arc-shaped limiting pieces and the second arc-shaped limiting pieces are respectively engaged with the outer and inner sides of the corresponding arc-shaped pieces.

[0015] As a further improvement to the above technical solution, one end of the fixing member is provided with a slot, and the inner wall of the cover is provided with a locking block that engages with the slot.

[0016] As a further improvement to the above technical solution, the inner hole of the winding core and the outer periphery of the rotating component are engaged by a toothed structure to achieve synchronous rotation, and the winding core can move relative to the rotating component along the axial direction.

[0017] The beneficial effects of this invention are as follows: This invention provides a tension-adjustable roll-type bandage pull-out device. Through a fixed component, a rotating component, a resistance component, an adjusting component, and a roll core disposed within the outer casing, the rotating component and the fixed component can rotate relative to each other. The resistance component is disposed between the fixed component and the rotating component. The operator adjusts the compression of the compression spring by adjusting the adjusting component according to treatment needs, thereby adjusting the spring's clamping force. During bandaging, the operator holds the outer casing with one hand and pulls the bandage head through the outlet with continuous force using the other hand, bringing the bandage head into contact with the guide roller. The tension of the bandage is transmitted to the rotating component through the roll core. The rotating component drives the fixed ratchet to rotate. The fixed ratchet needs to overcome the friction between itself and the sliding ratchet to rotate. At this time, the resistance torque formed by this friction is proportional to the axial clamping force of the compression spring acting on the fixed ratchet through the sliding ratchet. Since the position of the guide roller at the outlet is fixed, regardless of the bandage roll diameter continuously decreasing, the fulcrum when the bandage is pulled out is always at the tangent point of the guide roller; therefore, the radius of the lever arm is constant. Let the pulling force be F, the resisting torque be T, and the radius of the lever arm be r. According to the physical formula F=T / r, since the preset clamping force keeps the resisting torque T and the radius of the lever arm r constant, the output pulling force F remains constant throughout the bandage pulling process, regardless of the remaining diameter of the bandage roll itself. This means that the operator can pull the bandage out and wrap it around the affected area with a constant pulling force, thus ensuring consistency in operation among different operators and maintaining a constant pressure for each bandage application. Furthermore, the pulling force can be adjusted according to different bandaging sites, improving the controllability and safety of the treatment. Moreover, the entire device requires no electronic components, sensors, or batteries, avoiding electromagnetic interference and improving the device's reliability and lifespan. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of a tension-adjustable roll-type bandage pull-out device provided in an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure when the cover is open; Figure 3 yes Figure 2 Another structural diagram from a different perspective; Figure 4 yes Figure 1 A structural diagram illustrating the process of changing a bandage roll; Figure 5 yes Figure 1 A sectional view; Figure 6 yes Figure 1 Exploded view; Figure 7 yes Figure 6An exploded view from another perspective; Figure 8 yes Figure 6 A partial exploded view.

[0020] Reference numerals: 100-outer shell, 110-housing shell, 111-end cap, 112-arc-shaped piece, 113-discharge port, 115-first sleeve, 116-protrusion, 117-external thread, 120-cover, 121-operating hole, 122-arc-shaped flange, 123-first arc-shaped limiting piece, 124-second arc-shaped limiting piece, 125-block, 130-guide roller, 200-fixing component, 210-accommodating hole, 220-slide groove, 230-second sleeve, 2 40-First threaded hole, 250-Second threaded hole, 260-Guide hole, 270-Slot, 300-Rotating component, 310-First hole section, 320-Second hole section, 400-Resistance component, 410-Fixed ratchet, 420-Sliding ratchet, 421-Slide bar, 422-Baffle, 423-Allowing opening, 430-Compression spring, 500-Adjusting component, 510-Stud, 520-Adjusting knob, 530-Guide post, 540-Pressure block, 600-Core. Detailed Implementation

[0021] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0022] Reference Figures 1 to 8This invention provides an adjustable tension roll-type bandage pull-out device, comprising a housing 100, a fixing member 200, a rotating member 300, a resistance component 400, an adjusting component 500, and a roll core 600 disposed within the housing 100. The housing 100 has a discharge port 113 for pulling out the bandage, and a guide roller 130 is provided in the discharge port 113. The fixing member 200 is a cylindrical structure, with one end fixedly installed inside the housing 100, and has a receiving hole 210 and a sliding groove 220 inside. The rotating member 300 is sleeved on the outer periphery of the fixing member 200. The resistance component 400 is disposed between the fixing member 200 and the rotating member 300, and includes a fixed ratchet 410, a sliding ratchet 420, and a compression spring 430. 410 is fixedly connected to the rotating part 300. The sliding ratchet 420 is disposed in the slide groove 220 and can move along the length direction of the slide groove 220. The fixed ratchet 410 meshes with the sliding ratchet 420. The compression spring 430 is accommodated in the receiving hole 210 and is used to provide a clamping force to the sliding ratchet 420 toward the fixed ratchet 410. The adjusting assembly 500 is used to adjust the clamping force of the compression spring 430. The core 600 is detachably connected to the rotating part 300, and its outer periphery is used to wrap the bandage.

[0023] In use, open the outer casing 100, connect the core 600 with the bandage wrapped around it to the rotating part 300, lead out the bandage head, pass through the discharge port 113 of the outer casing 100, close the outer casing 100, and the bandage installation is complete.

[0024] According to treatment needs, the operator adjusts the compression of the spring 430 by adjusting the component 500, thereby adjusting the clamping force of the spring 430. During bandaging, the operator holds the outer shell 100 with one hand and pulls the bandage head through the outlet 113 with a continuous force with the other hand, bringing the bandage head into contact with the guide roller 130. The tension of the bandage is transmitted to the rotating component 300 through the core 600. The rotating component 300 drives the fixed ratchet 410 to rotate. The fixed ratchet 410 needs to overcome the friction between itself and the sliding ratchet 420 in order to rotate. At this time, the resistance torque formed by this friction is proportional to the axial clamping force of the spring 430 acting on the fixed ratchet 410 through the sliding ratchet 420. Since the position of the guide roller 130 at the outlet 113 is fixed, no matter how small the bandage roll diameter becomes, the fulcrum when the bandage is pulled out is always at the tangent point of the guide roller 130. Therefore, the radius of the lever arm is constant. Let the pulling force be F, the resisting torque be T, and the radius of the lever arm be r. According to the physical formula F=T / r, since the preset clamping force keeps the resisting torque T and the radius of the lever arm r constant, the output pulling force F remains constant throughout the bandage pulling process, regardless of the remaining diameter of the bandage roll itself. This means that the operator can pull the bandage out and wrap it around the affected area with a constant pulling force, thus ensuring consistency in operation among different operators and maintaining a constant pressure for each bandage application. Furthermore, the pulling force can be adjusted according to different bandaging sites, improving the controllability and safety of the treatment. Moreover, the entire device requires no electronic components, sensors, or batteries, avoiding electromagnetic interference and improving the device's reliability and lifespan.

[0025] In some preferred embodiments, the inner wall of the outer casing 100 is provided with a first sleeve 115 and a protrusion 116 located inside the first sleeve 115, forming an annular gap between the first sleeve 115 and the protrusion 116. One end of the fixing member 200 is provided with a second sleeve 230, which is coaxial with the receiving hole 210. The second sleeve 230 extends into the annular gap and is fixedly connected to the first sleeve 115 or the protrusion 116.

[0026] Understandably, the inner wall of the first sleeve 115 limits the outer wall of the second sleeve 230 to prevent the fixing member 200 from loosening or deflecting relative to the outer shell 100 during the bandage pulling process. At the same time, it makes the overall structure compact and easy for the operator to grip.

[0027] In some preferred embodiments, the outer periphery of the protrusion 116 is provided with an external thread 117, and the second sleeve 230 is provided with a first threaded hole 240 that matches the external thread 117.

[0028] During installation, first align the end of the fastener 200 with the second sleeve 230 with the protrusion 116 on the inner wall of the housing 100. By rotating the fastener 200 or the housing 100, the first threaded hole 240 on the second sleeve 230 engages with the external thread 117 on the protrusion 116, allowing the second sleeve 230 to precisely extend into the annular gap formed between the first sleeve 115 and the protrusion 116 until it is fully in place and reaches the preset tightness. The threaded connection between the protrusion 116 and the second sleeve 230 provides the main axial tension force, preventing the fastener 200 from axially moving relative to the housing 100, thereby improving the reliability of the device.

[0029] In other alternative embodiments, the fixed connection between the second sleeve 230 and the first sleeve 115 or the protrusion 116 can also be achieved by welding, bonding, interference fit, or other methods.

[0030] If the connection is achieved through welding, a locking or anti-foolproof structure is first set between the second sleeve 230 and the first sleeve 115 or the protrusion 116 for circumferential pre-positioning. The materials of the outer shell 100 and the fastener 200 are both specific weldable materials such as engineering plastics or metals. After the second sleeve 230 is inserted into the annular gap formed between the first sleeve 115 and the protrusion 116, the materials at the contact interface between the second sleeve 230 and the first sleeve 115 or the protrusion 116 are melted and fused together by means of hot melt welding, ultrasonic welding, or laser welding, thereby achieving permanent fixation.

[0031] If the connection is made by adhesive bonding, the circumferential pre-positioning is first achieved by setting a locking or anti-foolproof structure between the second sleeve 230 and the first sleeve 115 or the protrusion 116. Then, epoxy resin, anaerobic adhesive or other adhesives are applied to the mating surfaces between the second sleeve and the first sleeve and / or the protrusion. After the adhesive has completely cured, a firm connection is formed.

[0032] If the connection is made using an interference fit, a pre-positioning mechanism or anti-foolproof structure is first installed between the second sleeve 230 and the first sleeve 115 or the protrusion 116 to ensure circumferential positioning. This ensures that the outer diameter of the second sleeve 230 is slightly larger than the inner diameter of the first sleeve 115, or the inner diameter of the second sleeve 230 is slightly smaller than the outer diameter of the protrusion 116. Then, an axial force is applied using a pressure fixture, causing elastic or plastic deformation of the second sleeve 230, thereby forming a secure interference fit between the second sleeve 230 and the first sleeve 115 or the protrusion 116.

[0033] In some preferred embodiments, the rotating member 300 has a through hole inside, and the fixing ratchet 410 is fixed in the through hole and divided into a first hole segment 310 and a second hole segment 320. The first hole segment 310 is sleeved on the outer periphery of the first sleeve 115, and the second hole segment 320 is sleeved on the outer periphery of the fixing member 200, so that one axial end of the fixing ratchet 410 is limited by the end face of the first sleeve 115.

[0034] Understandably, when the bandage is pulled out, the drive core 600, the rotating component 300, and the fixed ratchet 410 rotate together. At this time, the first sleeve 115 radially limits the first hole section 310, and the fixed component 200 radially limits the second hole section 320, ensuring that the rotating component 300 rotates around the fixed component 200 and the first sleeve 115 as its axis. This improves the stability of the rotating component 300 during rotation and avoids radial sway and off-center loading. At the same time, the end face of the first sleeve 115 forms a mechanical stop, which can continuously withstand the axial pressure transmitted from the fixed ratchet 410, preventing the entire rotating component 300 from axially shifting.

[0035] In some preferred embodiments, a plurality of slide bars 421 arranged in a ring array are provided on one axial side of the sliding ratchet 420. The number of slide grooves 220 is the same as the number of slide bars 421 and they slide in one by one. The plurality of slide grooves 220 pass through the second sleeve 230 and extend axially into the receiving hole 210. A baffle 422 is provided at the center of the sliding ratchet 420. One end of the compression spring 430 abuts against the baffle 422. The baffle 422 has a plurality of clearance openings 423 for the second sleeve 230 to pass through.

[0036] It should be noted that multiple grooves 220 divide the second sleeve 230 into multiple arc-shaped blocks, and multiple clearance openings 423 allow multiple arc-shaped blocks to pass through.

[0037] During assembly, the multiple sliders 421 on the sliding ratchet 420 are aligned one by one with the multiple grooves 220 of the second sleeve 230. Then, the sliding ratchet 420 is pushed axially so that all the sliders 421 are precisely embedded in the corresponding grooves 220. At this time, the multiple arc-shaped blocks formed by the grooves 220 of the second sleeve 230 pass through the corresponding clearance openings 423 on the baffle 422 at the center of the sliding ratchet 420. Thus, within a limited axial space, the travel distance of the sliding ratchet 420 can be longer, thereby expanding the range of pressure adjustment.

[0038] Meanwhile, the compression spring 430 is located in the space formed between the multiple slide bars 421. Therefore, the multiple slide bars 421 can limit the radial position of the compression spring 430, prevent the compression spring 430 from bending, and ensure the stability and accuracy of the pressure.

[0039] When the compression of the spring 430 is adjusted by adjusting the component 500, the force of the spring 430 acts on the baffle 422 and pushes the entire sliding ratchet 420 to move axially along the length of the slide groove 220, so as to adjust the clamping force of the sliding ratchet 420 on the fixed ratchet 410.

[0040] When the bandage is pulled out, a tangential force is generated between the fixed ratchet 410 and the sliding ratchet 420. At this time, the multiple slide bars 421 on the sliding ratchet 420 cooperate with the multiple slide grooves 220, and the multiple evenly distributed contact surfaces can jointly resist the rotational torque of the sliding ratchet 420, preventing the sliding ratchet 420 from rotating and shaking. At this time, the normal pressure of the sliding ratchet 420 on the tooth surface of the fixed ratchet 410 remains stable, ensuring the constant resistance torque.

[0041] In some preferred embodiments, the end of the fixing member 200 away from the second sleeve 230 is provided with a second threaded hole 250, the second threaded hole 250 is coaxial with the receiving hole 210, the adjusting assembly 500 includes a stud 510 and an adjusting knob 520, the adjusting knob 520 is provided at one end of the stud 510, the stud 510 is threadedly connected to the second threaded hole 250, the end of the stud 510 away from the adjusting knob 520 is used to limit one end of the compression spring 430, and the outer shell 100 is provided with an operating hole 121 corresponding to the adjusting knob 520.

[0042] During adjustment, the operator inserts the knob 520 into the operating hole 121 on the housing 100 and rotates it. The knob 520 rotates the stud 510, converting its rotational motion into linear motion along its axis. When the stud 510 is screwed inward, its end pushes and compresses the spring 430; when the stud is screwed outward, the pressure on the spring 430 is released. This allows for precise and stepless adjustment of the compression of the spring 430, and the adjustment is simple and convenient, requiring no external tools. The operator can easily set the tension with just one hand.

[0043] Moreover, when the stud 510 stops rotating, the elastic force of the compression spring 430 acts on the end of the stud 510, so that the stud 510 and the second threaded hole 250 achieve axial self-locking, which prevents the stud 510 from loosening due to vibration or other external forces during use, and ensures that the position of the stud 510 remains fixed, thereby ensuring a constant resistance torque.

[0044] Furthermore, the fastener 200 is also provided with a guide hole 260, the receiving hole 210, the guide hole 260 and the second threaded hole 250 are connected in sequence and coaxial, the end of the stud 510 away from the adjustment knob 520 is provided with a guide post 530, the guide post 530 slides with the guide hole 260, one end of the compression spring 430 is provided with a pressure block 540, and one end of the guide post 530 abuts against the pressure block 540.

[0045] Understandably, when the operator rotates the adjustment knob 520, the knob 520 drives the thread to rotate and move axially. The guide post 530, located at one end of the stud 510, moves synchronously and slides axially within the guide hole 260 of the fixing member 200. The end of the guide post 530 directly pushes the pressure block 540, which evenly transmits force and compresses the compression spring 430. This ensures that the stud 510 and guide post 530 maintain linear movement, improving the accuracy of the pressure block 540's position and thus ensuring the accuracy of pressure adjustment. Furthermore, the pressure block 540 provides a large and flat contact surface to the end of the compression spring 430, preventing deformation due to uneven force distribution.

[0046] In some preferred embodiments, the outer casing 100 includes a housing 110 and a cover 120. The housing 110 includes an end cap 111 and two arc-shaped pieces 112. One end of each of the two arc-shaped pieces 112 is fixedly connected to the edge of the end cap 111. A discharge port 113 is formed between the two arc-shaped pieces 112. A guide roller 130 is disposed on one side of the arc-shaped pieces 112. The cover 120 is detachably connected to the other end of the two arc-shaped pieces 112 and is parallel to the end cap 111. A first sleeve 115 and a protrusion 116 are disposed on the inner wall of the end cap 111. An operating hole 121 is disposed on the cover 120.

[0047] Understandably, the interior of the housing 110 can fully accommodate all mechanical structures, and the outer periphery of the two arc-shaped pieces 112 of the housing 110 can serve as grips, facilitating operator handling and resulting in a compact overall structure. The cover 120 is detachably connected to the housing 110, facilitating the replacement of the bandage roll.

[0048] To facilitate operators in adjusting different pressure values, a setting or scale corresponding to the adjustment knob 520 can be provided on the outside of the cover 120.

[0049] Furthermore, an arc-shaped flange 122 is provided on the radially outer side of the cover 120, and two first arc-shaped limiting pieces 123 are provided on the inner wall of the arc-shaped flange 122. Two second arc-shaped limiting pieces 124 are provided on the inner edge of the cover 120. The first arc-shaped limiting pieces 123 and the second arc-shaped limiting pieces 124 are respectively engaged on the outer and inner sides of the corresponding arc-shaped pieces 112.

[0050] When installing the cover 120, first align the cover 120 with the free ends of the two arc-shaped pieces 112, then push the cover 120 in axially, so that the two arc-shaped pieces 112 are respectively inserted between the corresponding first arc-shaped limiting piece 123 and second arc-shaped limiting piece 124, and the first arc-shaped limiting piece 123 and / or the second arc-shaped limiting piece 124 undergo elastic deformation until the free ends of the two arc-shaped pieces 112 abut against the inner wall of the cover 120. At this time, the first arc-shaped limiting piece 123 and the second arc-shaped limiting piece 124 are respectively engaged on the outer and inner sides of the corresponding arc-shaped pieces 112, and the locking is completed. When removing the cover 120, pull it out axially along the housing 110. Thus, the cover 120 can be quickly installed and removed, improving the replacement efficiency of the bandage roll.

[0051] Furthermore, one end of the fastener 200 is provided with a slot 270, and the inner wall of the cover 120 is provided with a locking block 125 that engages with the slot 270.

[0052] It is understandable that when installing the cover 120, the locking block 125 on the cover 120 is inserted into the locking groove 270 of the fastener 200, thereby achieving double fixation and improving the assembly firmness of the overall structure.

[0053] There are multiple slots 270 and multiple blocks 125. The multiple slots 270 are arranged in a ring array along the axis of the fixing member 200. The multiple blocks 125 are inserted into the corresponding slots 270 respectively. This can make the force uniform and avoid stress concentration and local wear caused by single point force. At the same time, it also keeps the cover 120 and the fixing member 200 concentric.

[0054] Specifically, a raised rib is provided on one side of the locking block 125. When the locking block 125 is inserted into the locking groove 270, the raised rib is interference-fitted with the side wall of the locking groove 270, thereby forcing the raised rib to undergo elastic deformation, so that the raised rib generates a continuous pressing force on the side wall of the locking groove 270, thereby improving the connection between the cover 120 and the fixing member 200.

[0055] In some preferred embodiments, the inner hole of the core 600 and the outer periphery of the rotating member 300 are engaged by a toothed structure to achieve synchronous rotation, and the core 600 can move relative to the rotating member 300 along the axial direction.

[0056] When installing the bandage roll, first open the cover 120, then align the core 600 with the bandage wrapped around it with one end of the rotating part 300, and push the core 600 in axially so that the teeth of the inner hole of the core 600 mesh with the teeth of the outer circumference of the rotating part 300 until it is pushed to the predetermined position. Finally, close the cover 120 on the housing 110.

[0057] When the operator pulls out the bandage, the tension is transmitted to the core 600 through the bandage. Since the inner hole of the core 600 and the outer circumference of the rotating part 300 are engaged by a toothed structure, the core 600 and the rotating part 300 can only move axially and cannot rotate circumferentially. Therefore, the core 600 drives the rotating part 300 and the fixed ratchet 410 to rotate over the resistance torque of the sliding ratchet 420.

[0058] When the bandage is used up, first open the cover 120 and pull the core 600 out of the rotating part 300 along the axis, thereby improving the efficiency of changing the bandage roll.

[0059] It should be noted that the tooth structure can be a structure of intermeshing square teeth, triangular teeth, splines, etc., and no specific limitation is made on the tooth structure in the embodiments of the present invention.

[0060] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A tension-adjustable roll-type bandage pull-out device, characterized in that, include: The outer casing has an outlet for pulling out the bandage, and the outlet is equipped with a guide roller; A fastener is fixedly installed inside the housing, and its interior has a receiving hole and a sliding groove; A rotating component is fitted around the outer periphery of the fixed component; A resistance assembly, disposed between the fixed member and the rotating member, includes a fixed ratchet, a sliding ratchet, and a compression spring. The fixed ratchet is fixedly connected to the rotating member. The sliding ratchet is disposed in the slide groove and can move along the length direction of the slide groove. The fixed ratchet meshes with the sliding ratchet. The compression spring is accommodated in the receiving hole and is used to provide a clamping force to the sliding ratchet toward the fixed ratchet. An adjustment component is used to adjust the clamping force of the compression spring; The core, detachably connected to the rotating component, has its outer periphery used for wrapping bandages.

2. The adjustable tension roll-type bandage pull-out device according to claim 1, characterized in that, The inner wall of the outer casing is provided with a first sleeve and a protrusion located inside the first sleeve. An annular gap is formed between the first sleeve and the protrusion. One end of the fixing member is provided with a second sleeve. The second sleeve is coaxial with the receiving hole. The second sleeve extends into the annular gap and is fixedly connected to the first sleeve or the protrusion.

3. The adjustable tension roll-type bandage pull-out device according to claim 2, characterized in that, The rotating component has a through hole inside. The fixed ratchet is fixed inside the through hole and divided into a first hole segment and a second hole segment. The first hole segment is sleeved on the outer periphery of the first sleeve, and the second hole segment is sleeved on the outer periphery of the fixed component, so that one axial end of the fixed ratchet is limited by the end face of the first sleeve.

4. A tension-adjustable roll-type bandage pull-out device according to claim 2 or 3, characterized in that, The sliding ratchet has a plurality of slide bars arranged in a ring array on one axial side. The number of slide grooves is the same as the number of slide bars and they slide in one-to-one. The plurality of slide grooves pass through the second sleeve and extend axially into the receiving hole. A baffle is provided at the center of the sliding ratchet. One end of the compression spring abuts against the baffle. The baffle has a plurality of clearance openings for the second sleeve to pass through.

5. The adjustable tension roll-type bandage pull-out device according to claim 2, characterized in that, The fixing member has a second threaded hole at the end away from the second sleeve. The second threaded hole is coaxial with the receiving hole. The adjusting component includes a stud and an adjusting knob. The adjusting knob is located at one end of the stud. The stud is threadedly connected to the second threaded hole. The end of the stud away from the adjusting knob is used to limit one end of the compression spring. The outer shell has an operating hole corresponding to the adjusting knob.

6. The adjustable tension roll-type bandage pull-out device according to claim 5, characterized in that, The fixing component is also provided with a guide hole. The receiving hole, the guide hole and the second threaded hole are connected in sequence and coaxial. The end of the stud away from the adjustment knob is provided with a guide post. The guide post is slidably engaged with the guide hole. One end of the compression spring is provided with a pressure block. One end of the guide post abuts against the pressure block.

7. The adjustable tension roll-type bandage pull-out device according to claim 5, characterized in that, The outer casing includes a housing and a cover. The housing includes an end cap and two arc-shaped pieces. One end of each of the two arc-shaped pieces is fixedly connected to the edge of the end cap. The discharge port is formed between the two arc-shaped pieces. The guide roller is disposed on one side of the arc-shaped pieces. The cover is detachably connected to the other end of the two arc-shaped pieces and is parallel to the end cap. The first sleeve and the protrusion are disposed on the inner wall of the end cap. The operating hole is disposed on the cover.

8. The adjustable tension roll-type bandage pull-out device according to claim 7, characterized in that, The cover has an arc-shaped flange on its radial outer side, and the inner wall of the arc-shaped flange has two first arc-shaped limiting pieces. The inner edge of the cover has two second arc-shaped limiting pieces, and the first and second arc-shaped limiting pieces are respectively engaged with the outer and inner sides of the corresponding arc-shaped pieces.

9. A tension-adjustable roll-type bandage pull-out device according to claim 7, characterized in that, One end of the fastener is provided with a slot, and the inner wall of the cover is provided with a block that engages with the slot.

10. The adjustable tension roll-type bandage pull-out device according to claim 1, characterized in that, The inner hole of the winding core engages with the outer periphery of the rotating component through a toothed structure to achieve synchronous rotation, and the winding core can move relative to the rotating component along its axial direction.

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