Non-motor unwinding mechanism

Abstract

The utility model relates to the technical field of material unwinding, in particular to a motor-free unwinding mechanism which comprises a mounting plate and an unwinding drum rotationally connected to the mounting plate to unwind a film material, the mounting plate is hinged to a tensioning swing arm through a first hinge shaft, and one end of the tensioning swing arm is provided with a tensioning roller located in front of the unwinding drum; the axial direction of the tensioning roller is parallel to the axial direction of the unwinding drum, the starting end of a film material is wound on the upper circumferential wall of the tensioning roller and extends downwards to be discharged, the starting end of the film material is pulled by a power device to be discharged, and the other end of the tensioning swing arm is provided with a brake part which abuts against the unwinding drum to conduct braking. The mounting plate is provided with a first elastic piece which forces the tensioning swing arm to swing till the brake piece abuts against the unwinding drum in a normal state. The unwinding mechanism has the effect of reducing the maintenance cost of the unwinding mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of material unwinding, and in particular to a motorless unwinding mechanism. Background Art

[0002] After electronic components are processed, they need to be packaged. The products are placed sequentially in a carrier with multiple independent slots. The slots are then covered with packaging film, which is then heat-sealed using a hot press. During the continuous packaging process, the film material needs to be unwound.

[0003] In existing technology, unwinding is typically performed with a motor. When the film is loose, it indicates that the motor is unwinding too fast, and the motor needs to be stopped, stopping the unwinding process until the film is properly tensioned. When the film is too tight, it indicates that the motor is unwinding too slowly, and the motor will speed up the unwinding process. Using a motor to unwind the film consumes electricity and requires multiple sensors to monitor the film's status, resulting in high maintenance costs and calls for further improvement. Utility Model Content

[0004] In order to reduce the maintenance cost of the unwinding mechanism, the present application provides a motorless unwinding mechanism.

[0005] The present application provides a motorless unwinding mechanism that adopts the following technical solutions:

[0006] The cam is secured to the chassis and has a first end that is secured to the chassis by a spring that is secured to the chassis's front end and a second end that is secured to the chassis's rear end.

[0007] By adopting the above technical solution, the starting end of the film material on the unwinding drum is wound around the upper wall of the tensioning roller and extends downward for discharging. The starting end of the film material is pulled and discharged by the power device. During the discharging process of the film material, a downward force is first applied to the tensioning roller, so that the front end of the tensioning swing arm swings downward around the axis of the first hinge shaft, thereby driving the rear end of the tensioning swing arm to swing upward around the axis of the first hinge shaft, so that the brake part is separated from the unwinding drum, and the brake on the unwinding drum is released. The unwinding drum will then rotate to perform the unwinding operation. At this time, the first elastic part undergoes elastic deformation and has elastic potential energy. When the unwinding speed of the unwinding drum is too fast, the force acting on the tensioning roller becomes smaller, and the first elastic part forces the tensioning swing arm to swing back to its original position, so that the brake part is pressed against the unwinding drum to brake the unwinding drum. There is no need to use a motor, and it can be adaptively tensioned, reducing the maintenance cost of the unwinding mechanism.

[0008] Preferably, the tensioning roller includes a tensioning shaft fixedly connected to the end of the tensioning swing arm and a tensioning wheel coaxially rotatably sleeved on the tensioning shaft.

[0009] By adopting the above technical solution, the tensioning wheel is rotatably connected to the tensioning shaft, so that the tensioning wheel rotates along with the film material during the film material conveying process, reducing the friction between the film material and the tensioning roller and improving the smoothness of the film material discharge.

[0010] Preferably, the tensioning shaft is fixedly connected to a limiting frame, and the limiting frame includes a pair of limiting vertical plates respectively located at both ends of the tensioning wheel and fixedly connected to the tensioning shaft, and a limiting horizontal plate fixedly connected between the two limiting vertical plates and located above the tensioning wheel. The lower end surface of the limiting horizontal plate and the upper wall of the tensioning wheel form a membrane material cavity, and the starting end of the membrane material passes through the membrane material cavity and extends downward.

[0011] By adopting the above technical solution, the starting end of the film material passes through the film material cavity and extends downward, making the film material more stable during the discharging process, avoiding the deviation or shaking of the film material during the discharging process, and improving the reliability and stability of the unwinding process.

[0012] Preferably, the tensioning swing arm is located on the side of the mounting plate away from the unwinding drum, the mounting plate is rotatably connected to the unwinding shaft, the unwinding drum includes a cylinder body detachably connected to the unwinding shaft and a pair of side plates respectively fixedly connected to the two ends of the cylinder body, the cylinder body and the side plates are sleeved on the unwinding shaft, the cylinder body and the unwinding shaft are circumferentially linked, the mounting plate is provided with an avoidance groove for the brake part to slide through, and the end of the unwinding shaft close to the mounting plate is coaxially fixedly connected to a brake ring for the brake part to abut.

[0013] By adopting this technical solution, the tensioning swing arm is located on the side of the mounting plate away from the unwinding drum, ensuring ample room for the tensioning swing arm to swing, thereby improving the stability and reliability of the mechanism. The cylinder body is detachably connected to the unwinding shaft, facilitating film replacement and maintenance, and enhancing operational convenience. The mounting plate includes a clearance groove for the brake element to slide through. A brake ring, which the brake element abuts, is coaxially fixed to the end of the unwinding shaft closest to the mounting plate. This ensures that the brake element can accurately and reliably brake the unwinding drum, avoiding unwinding instability caused by improperly positioned brake elements.

[0014] Preferably, the brake component includes a brake rod fixedly connected to the end of the tensioning swing arm and a rubber head cover coaxially fixedly sleeved on the brake rod, the brake rod slides through the avoidance groove, and the rubber head cover abuts against the brake ring for braking.

[0015] By adopting the above technical solution, the brake rod provides a mounting carrier for the rubber head cover. When the rubber head cover abuts against the brake ring, there is a large friction between the rubber head cover and the brake ring, so as to facilitate timely braking. At the same time, the flexible contact of the rubber head cover can reduce the wear on the brake ring and extend the service life.

[0016] Preferably, the outer peripheral wall of the unwinding shaft is provided with a second elastic member, which is normally pressed against the inner peripheral wall of the cylinder to realize the circumferential linkage setting of the cylinder and the unwinding shaft in a damping form.

[0017] By adopting this technical solution, the second elastic member normally abuts against the inner circumferential wall of the cylinder, providing damping for the circumferential linkage between the cylinder and the unwinding shaft. This effectively prevents unnecessary relative sliding of the cylinder during the unwinding process, improving the stability and reliability of the unwinding process. This structural design also simplifies the complexity of the unwinding mechanism and reduces maintenance costs.

[0018] Preferably, the mounting plate is provided with an anti-slip assembly for limiting axial slippage of the cylinder, and the anti-slip assembly includes a limit swing plate hinged to the mounting plate through a second hinge shaft and a limit baffle arranged at the free end of the limit swing plate, and the limit baffle abuts against the outer wall of the side plate away from the mounting plate.

[0019] By adopting the above technical solution, when the cylinder needs to be replaced, a force is applied to the free end of the limit swing plate to make the limit baffle and the limit swing plate rotate around the axis of the second hinge shaft in the direction away from the cylinder, thereby separating the limit baffle from the side plate and providing a sliding avoidance space for the axial sliding of the cylinder. Then the cylinder can be pulled out with force. After the new cylinder is installed, the limit swing plate is rotated to reset so that the limit baffle abuts against the outer wall of the side plate away from the mounting plate, effectively preventing the cylinder from sliding in the opposite direction and escaping from the unwinding shaft.

[0020] Preferably, the limit baffle is slidably connected to the limit swing plate along the length direction of the limit swing plate, and the limit swing plate is provided with a fixing member for fixing the sliding position of the limit baffle.

[0021] By adopting this technical solution, the limit baffle is slidably connected to the limit swing plate along its length, allowing the position of the limit baffle to be adjusted according to actual needs, enhancing the flexibility and applicability of the device. Furthermore, a fixing member is provided on the limit swing plate to secure the sliding position of the limit baffle, ensuring that the limit baffle remains fixed after adjustment, preventing loosening due to vibration or other external factors, and improving the stability and reliability of the device.

[0022] Preferably, the limit baffle has a guide groove that is slidably sleeved on the limit swing plate, the inner wall of the guide groove is provided with a threaded hole, and the limit swing plate is provided with a through groove, the through groove corresponds to the threaded hole, the through groove is a strip groove and the length direction is parallel to the length direction of the limit swing plate, the fixing part is a fixing bolt that is provided in the through groove and threadedly connected to the threaded hole, and the nut end face of the fixing bolt is pressed against the outer wall of the limit swing plate.

[0023] By adopting this technical solution, the stopper plate can slide on the stopper plate, thereby adjusting its position so that it more accurately abuts the outer wall of the side plate, preventing axial slippage of the cylinder. The fixing bolt passes through the slot and is threaded into the threaded hole, fixing the position of the stopper plate, ensuring its stability and reliability, and avoiding the risk of the cylinder falling off due to loosening of the stopper plate.

[0024] Preferably, the first elastic member is a tension spring, one end of the tension spring is fixedly connected to the mounting plate, and the other end of the tension spring is fixedly connected to the tensioning swing arm.

[0025] By employing this technical solution, the tension spring serves as the first elastic element. During the unwinding process, when the film tension changes, the tension spring rapidly responds and generates corresponding changes in elastic force. When the film tension decreases, the elastic force of the tension spring resets the tensioning arm, re-engaging the brake element against the unwind drum, effectively preventing excessive film slack. Conversely, when the film tension becomes excessive, the tension spring stretches, reducing the constraint on the tensioning arm and freeing the brake element from the unwind drum, ensuring smooth rotation of the unwind drum. This improves system stability and reliability, while reducing maintenance costs.

[0026] In summary, the present invention has the following beneficial effects:

[0027] The first elastic member forces the tensioning swing arm to swing back to its original position, so that the brake member is pressed against the unwinding drum to brake the unwinding drum. No motor is required, and the tensioning roller can be automatically adjusted.

[0028] 2. The second elastic member is normally pressed against the inner wall of the cylinder, achieving circumferential linkage between the cylinder and the unwinding shaft in the form of damping, effectively preventing unnecessary relative sliding of the cylinder during the unwinding process, and improving the stability and reliability of the unwinding process. At the same time, this structural design simplifies the complexity of the unwinding mechanism and reduces maintenance costs;

[0029] 3. When the cylinder needs to be replaced, apply force to the free end of the limit swing plate to make the limit baffle and the limit swing plate rotate around the axis of the second hinge shaft in the direction away from the cylinder, thereby separating the limit baffle from the side plate and providing a sliding avoidance space for the axial sliding of the cylinder. Then, pull out the cylinder with force. After installing the new cylinder, rotate and reset the limit swing plate so that the limit baffle abuts against the outer wall of the side plate away from the mounting plate, effectively preventing the cylinder from sliding in the opposite direction and coming off the unwinding shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a motorless unwinding mechanism;

[0031] Figure 2 It is a schematic diagram of the connection structure between the unwinding drum and the unwinding shaft;

[0032] Figure 3 It is a schematic diagram of the connection structure between the shrapnel and the unwinding shaft;

[0033] Figure 4 Schematic diagram of the connection structure between the limit baffle and the limit swing plate;

[0034] Figure 5 It is a structural diagram of the limit frame;

[0035] Figure 6 It is a structural diagram of the limit support plate and the detection bracket.

[0036] In the figure, 1, mounting plate; 11, articulated seat; 111, second articulated shaft; 12, tensioning swing arm; 121, first articulated shaft; 13, tension spring; 14, tensioning roller; 141, tensioning shaft; 142, tensioning pulley; 15, limiting frame; 151, limiting vertical plate; 152, limiting horizontal plate; 16, avoidance groove; 17, brake component; 171, brake lever; 172, rubber head cover; 18 , detection hole; 19, detection bracket; 191, photoelectric sensor; 10, limit support plate; 2, unwinding drum; 21, cylinder; 22, side plate; 3, unwinding shaft; 31, brake ring; 32, spring piece; 33, mounting groove; 4, anti-slip assembly; 41, limit swing plate; 411, through groove; 42, limit baffle; 421, guide groove; 422, threaded hole; 43, limit disk; 44, fixing bolt. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-6 This application is described in further detail.

[0038] The present application discloses a motor-free unwinding mechanism. Figure 1 、 Figure 2 , including a mounting plate 1 and a reel 2 rotatably connected to the mounting plate 1 for unwinding the film material. The mounting plate 1 is rotatably connected to a reel shaft 3 , and the axial direction of the reel shaft 3 is perpendicular to the plate surface of the mounting plate 1 .

[0039] Reference Figure 2 、 Figure 3 The unwinding shaft 3 has a brake ring 31 coaxially fixedly sleeved on one end near the mounting plate 1, and a second elastic member is provided on the outer peripheral wall of the unwinding shaft 3. Specifically, the second elastic member is a spring 32, which is strip-shaped. The outer peripheral walls of both ends of the unwinding shaft 3 have mounting grooves 33. There are multiple mounting grooves 33 and they are distributed around the axis of the unwinding shaft 3. One end of the spring 32 is screwed to the mounting groove 33 at one end of the unwinding shaft 3, and the other end of the spring 32 is screwed to the mounting groove 33 at the other end of the unwinding shaft 3, so that the middle part of the spring 32 protrudes from the outer peripheral wall of the unwinding shaft 3. The unwinding drum 2 includes a barrel 21 detachably connected to the unwinding shaft 3 and a pair of side plates 22 coaxially fixedly sleeved on both ends of the barrel 21. The side plate 22 close to the mounting plate 1 is a transparent plate, and the other side plate 22 is an opaque plate. The film material is wound around the barrel 21 and is located between the two side plates 22. After the cylinder 21 is sleeved on the unwinding shaft 3, the spring piece 32 is pressed against the inner wall of the cylinder 21, realizing the circumferential linkage setting of the cylinder 21 and the unwinding shaft 3 in the form of damping, so that when the unwinding shaft 3 rotates, the cylinder 21 is driven to rotate together.

[0040] Reference Figure 2 、 Figure 4The rear end of the mounting plate 1 is fixedly connected to a hinge seat 11. The hinge seat 11 is provided with an anti-slip assembly 4 that limits the axial sliding of the cylinder 21. The anti-slip assembly 4 includes a limit swing plate 41 hinged to the hinge seat 11 via a second hinge shaft 111, a limit baffle 42 provided at the free end of the limit swing plate 41, and a limit plate 43 fixedly connected to the limit baffle 42. The axial direction of the second hinge shaft 111 is vertically arranged. The limit baffle 42 is slidably connected to the limit swing plate 41 along the length direction of the limit swing plate 41. The limit swing plate 41 is provided with a fixing member to fix the sliding position of the limit baffle 42. The limiting baffle 42 has a guide slot 421 that is slidably mounted on the limiting swing plate 41. The inner wall of the guide slot 421 is provided with a threaded hole 422. The limiting swing plate 41 is provided with a through slot 411 that corresponds to the threaded hole 422. The through slot 411 is a strip-shaped slot with its length parallel to the length of the limiting swing plate 41. The fixing member is a fixing bolt 44 that is inserted through the through slot 411 and threadedly connected to the threaded hole 422. The end face of the nut of the fixing bolt 44 abuts the outer wall of the limiting swing plate 41. The limiting plate 43 has a waist-shaped hole for the end of the unwinding shaft 3 away from the mounting plate 1 to pass through. The limiting plate 43 abuts the outer wall of the side plate 22 away from the mounting plate 1.

[0041] Reference Figure 1 、 Figure 5 A tensioning arm 12 is hingedly connected to the outer wall of the mounting plate 1, away from the unwinding drum 2, via a first hinge shaft 121. The axial direction of the first hinge shaft 121 is perpendicular to the surface of the mounting plate 1. A tensioning roller 14 is provided at one end of the tensioning arm 12, located in front of the unwinding drum 2. The axial direction of the tensioning roller 14 is parallel to the axial direction of the unwinding drum 2. The tensioning roller 14 includes a tensioning shaft 141 fixedly connected to the end of the tensioning arm 12 and a tensioning pulley 142 that is coaxially rotatably mounted on the tensioning shaft 141. The tensioning shaft 141 is fixedly connected to the limiting frame 15, and the limiting frame 15 includes a pair of limiting vertical plates 151 respectively located at both ends of the tensioning wheel 142 and fixedly connected to the tensioning shaft 141, and a limiting horizontal plate 152 fixedly connected between the two limiting vertical plates 151 and located above the tensioning wheel 142. The lower end surface of the limiting horizontal plate 152 and the upper wall of the tensioning wheel 142 form a film material cavity. The starting end of the film material passes through the film material cavity and extends downward. The starting end of the film material is pulled out by a power device.

[0042] Reference Figure 3 、 Figure 6The outer wall of the mounting plate 1 is provided with an escape groove 16. The other end of the tensioning swing arm 12 is provided with a brake member 17 that abuts against the unwinding drum 2 for braking. The brake member 17 includes a brake rod 171 fixedly connected to the end of the tensioning swing arm 12 and a rubber head cover 172 coaxially fixedly sleeved on the brake rod 171. The axial direction of the brake rod 171 is parallel to the axial direction of the unwinding shaft 3. The brake rod 171 slides through the escape groove 16, and the rubber head cover 172 abuts against the brake ring 31 for braking. The mounting plate 1 is provided with a first elastic member that forces the tensioning swing arm 12 to swing until the rubber head cover 172 abuts against the brake ring 31 under normal conditions. The first elastic member is a tension spring 13. One end of the tension spring 13 is fixedly connected to the mounting plate 1, and the other end of the tension spring 13 is fixedly connected to the tensioning swing arm 12. The mounting plate 1 is fixedly connected to a limit support plate 10 located on one side of the avoidance groove 16. The limit support plate 10 extends to the top of the brake rod 171 for the brake rod 171 to abut against, so as to limit the swing amplitude of the tensioning swing arm 12. The position of the limit support plate 10 is adjustable.

[0043] A detection hole 18 is formed through the outer wall of the mounting plate 1. A detection bracket 19 is fixedly connected to the outer wall of the mounting plate 1. A photoelectric sensor 191 is fixedly connected to the detection bracket 19. The photoelectric sensor 191 is used to detect the remaining amount of the film material on the cylinder 21. When the film material on the cylinder 21 is almost used up, the photoelectric sensor 191 transmits a signal to the power device, and the power device stops working.

[0044] The motorless unwinding mechanism of the present embodiment is implemented as follows: During the unwinding process, when the film tension decreases, the elastic force of the tension spring 13 causes the tensioning arm 12 to reset, causing the rubber head cover 172 to press against the brake ring 31 again for braking, thereby effectively preventing the film from excessively loosening. Conversely, when the film tension is excessive, the front end of the tensioning arm 12 swings downward, stretching the tension spring 13, causing the rear end of the tensioning arm 12 to swing upward, causing the rubber head cover 172 to disengage from the brake ring 31, ensuring smooth rotation of the unwinding drum 2, improving the stability and reliability of the system, and reducing maintenance costs.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A motorless unwinding mechanism, characterized in that: The invention comprises a mounting plate (1) and an unwinding drum (2) rotatably connected to the mounting plate (1) for unwinding a film material, wherein the mounting plate (1) is hingedly connected to a tensioning swing arm (12) via a first hinge shaft (121), and one end of the tensioning swing arm (12) is provided with a tensioning roller (14) located in front of the unwinding drum (2), and the axial direction of the tensioning roller (14) is parallel to the axial direction of the unwinding drum (2), and the starting end of the film material is wound around the upper wall of the tensioning roller (14) and extends downward for unwinding, and the starting end of the film material is pulled out by a power device, and the other end of the tensioning swing arm (12) is provided with a brake member (17) abutting against the unwinding drum (2) for braking, and the mounting plate (1) is provided with a first elastic member for forcing the tensioning swing arm (12) to swing until the brake member (17) abuts against the unwinding drum (2) under normal conditions.

2. The motorless unwinding mechanism according to claim 1, characterized in that: The tensioning roller (14) comprises a tensioning shaft (141) fixedly connected to the end of the tensioning swing arm (12) and a tensioning wheel (142) coaxially rotatably sleeved on the tensioning shaft (141).

3. The motorless unwinding mechanism according to claim 2, characterized in that: The tensioning shaft (141) is fixedly connected to a limiting frame (15), and the limiting frame (15) includes a pair of limiting vertical plates (151) respectively located at both ends of the tensioning wheel (142) and fixedly connected to the tensioning shaft (141), and a limiting horizontal plate (152) fixedly connected between the two limiting vertical plates (151) and located above the tensioning wheel (142). The lower end surface of the limiting horizontal plate (152) and the upper wall of the tensioning wheel (142) form a film material cavity, and the starting end of the film material passes through the film material cavity and extends downward.

4. The motorless unwinding mechanism according to claim 1, characterized in that: The tensioning swing arm (12) is located on a side of the mounting plate (1) away from the unwinding drum (2); the mounting plate (1) is rotatably connected to the unwinding shaft (3); the unwinding drum (2) comprises a cylinder (21) detachably connected to the unwinding shaft (3) and a pair of side plates (22) respectively fixedly connected to the two ends of the cylinder (21); the cylinder (21) and the side plates (22) are sleeved on the unwinding shaft (3); the cylinder (21) and the unwinding shaft (3) are circumferentially linked; the mounting plate (1) is provided with an avoidance groove (16) for the brake member (17) to slide through; and one end of the unwinding shaft (3) close to the mounting plate (1) is coaxially fixedly connected to a brake ring (31) for the brake member (17) to abut against.

5. The motorless unwinding mechanism according to claim 4, characterized in that: The brake component (17) includes a brake rod (171) fixedly connected to the end of the tensioning swing arm (12) and a rubber head cover (172) coaxially fixedly sleeved on the brake rod (171); the brake rod (171) slides through the avoidance groove (16), and the rubber head cover (172) abuts against the brake ring (31) to perform braking.

6. The motorless unwinding mechanism according to claim 4, characterized in that: The outer peripheral wall of the unwinding shaft (3) is provided with a second elastic member, which is normally pressed against the inner peripheral wall of the cylinder (21), thereby realizing a circumferential linkage arrangement between the cylinder (21) and the unwinding shaft (3) in a damping manner.

7. The motorless unwinding mechanism according to claim 6, characterized in that: The mounting plate (1) is provided with an anti-slip assembly (4) for limiting axial sliding of the cylinder (21), the anti-slip assembly (4) comprising a limiting swing plate (41) hinged to the mounting plate (1) via a second hinge shaft (111) and a limiting baffle (42) provided at a free end of the limiting swing plate (41), the limiting baffle (42) abutting against an outer wall of the side plate (22) on a side away from the mounting plate (1).

8. The motorless unwinding mechanism according to claim 7, characterized in that: The limiting baffle (42) is connected to the limiting swing plate (41) in a sliding manner along the length direction of the limiting swing plate (41), and the limiting swing plate (41) is provided with a fixing member for fixing the sliding position of the limiting baffle (42).

9. The motorless unwinding mechanism according to claim 7, characterized in that: The limiting baffle (42) has a guide groove (421) that is slidably sleeved on the limiting swing plate (41). The inner wall of the guide groove (421) is provided with a threaded hole (422). The limiting swing plate (41) is provided with a through groove (411). The through groove (411) corresponds to the threaded hole (422). The through groove (411) is a strip groove and its length direction is parallel to the length direction of the limiting swing plate (41). The fixing member is a fixing bolt (44) that is provided through the through groove (411) and is threadedly connected to the threaded hole (422). The nut end face of the fixing bolt (44) is pressed against the outer wall of the limiting swing plate (41).

10. The motorless unwinding mechanism according to claim 1, characterized in that: The first elastic member is a tension spring (13), one end of the tension spring (13) is fixedly connected to the mounting plate (1), and the other end of the tension spring (13) is fixedly connected to the tensioning swing arm (12).

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