A kind of take-off mechanism with weighing

Abstract

The utility model belongs to the unloading technology field relates to a take weighing mechanism. The utility model discloses the reel, unloading arm and tension sensor, and one end of unloading arm is rotatoryly connected with reel through mounting shaft, and the reel is installed the drive piece of driving unloading arm rotation, and the tension sensor is installed between the output of drive piece and unloading arm. Through installing tension sensor between unloading arm and unloading cylinder, the weight detection is completed synchronously in the unloading process. The independent weighing station and weighing residence time are saved, the overall rhythm of single volume operation is shortened, and the production efficiency is effectively improved. Through push rod, lead screw and spring, when the film roll reaches the receiving platform, the blocking of the blocking rod can be automatically removed, the film roll is automatically rolled down, and no additional power source or manual intervention is needed, further improving the automation degree and work efficiency of unloading.

Description

Technical Field

[0001] This utility model belongs to the field of unwinding technology and relates to an unwinding mechanism with weighing function. Background Technology

[0002] In roll film production equipment such as blown film machines, after the finished film roll is wound up, it needs to be unloaded from the winding position and transferred to the receiving table.

[0003] Patent document CN220351214U discloses an automatic film roll weighing mechanism for a thin film surface winding device. The mechanism works as follows: a winding shaft carrying the film roll moves along a horizontal guide rail from the winding position to the unwinding position. When the end of the winding shaft reaches the arc-shaped recess of the support block, the piston rod of the vertical cylinder retracts, causing the weight of the film roll to fall entirely onto the support block and be transmitted to the weighing sensor, thus completing the weighing. After weighing, the piston rod of the cylinder extends, lifting the winding shaft to detach it from the support block, allowing it to continue moving towards the unwinding position.

[0004] The weighing and unwinding actions have a sequential order. None of the above solutions can complete the weighing simultaneously during the unwinding process, which restricts the overall production efficiency of the machine.

[0005] To solve the above problems, this utility model proposes a weighing and unloading mechanism. Utility Model Content

[0006] To address the problems existing in the background technology, this utility model proposes a weighing and unwinding mechanism.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A weighing unwinding mechanism includes a take-up table, an unwinding arm, and a tension sensor. One end of the unwinding arm is rotatably connected to the take-up table via a mounting shaft. A drive unit for driving the unwinding arm to rotate is mounted on the take-up table. The tension sensor is installed between the output end of the drive unit and the unwinding arm.

[0009] The end of the unloading arm is slidably connected to a stop bar, which is used to limit the movement of the air shaft.

[0010] The unloading arm is slidably connected to a push rod, and a linkage is provided between the push rod and the stop rod to allow the stop rod and the push rod to slide in opposite directions.

[0011] The linkage includes a lead screw with helical grooves of opposite directions on both sides. A stop rod and a push rod are slidably connected to both sides of the lead screw. A first guide block is provided between the stop rod and the lead screw and is slidably disposed in the corresponding helical groove. A second guide block is provided between the push rod and the lead screw and is slidably disposed in the corresponding helical groove.

[0012] Furthermore, the driving component is a roll unloading cylinder.

[0013] Furthermore, a take-up position is provided on the take-up table.

[0014] Furthermore, a spring is fixedly connected between the push rod and the unloading arm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By installing a tension sensor between the unloading arm and the unloading cylinder, weight detection is completed simultaneously during the unloading process. This eliminates the need for a separate weighing station and weighing dwell time, shortens the overall cycle time of single-roll operations, and effectively improves production efficiency.

[0017] By setting a stop bar, the air shaft is effectively blocked when the unloading arm rotates downwards to unload the film, avoiding the risk of the film roll accidentally slipping and improving operational safety. In addition, the stop bar can be automatically released when the film roll reaches the receiving table via a push rod, lead screw, and spring, allowing the film roll to roll down automatically without the need for an additional power source or manual intervention, further improving the automation level and work efficiency of unloading. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a utility model Figure 1 Enlarged view of part A;

[0020] Figure 3 This is a schematic diagram of the structure of the stop rod and push rod in this utility model;

[0021] Figure 4 This is a schematic diagram of the installation structure of the unloading cylinder and the tension sensor in this utility model.

[0022] In the diagram: 1. Rewinding table; 2. Air shaft; 3. Rewinding position; 4. Unwinding cylinder; 5. Mounting shaft; 6. Unwinding arm; 7. Tension sensor; 8. Stop bar; 9. Push rod; 10. Lead screw; 11. Spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-4 As shown, the technical solution adopted by this utility model is as follows: a weighing and unwinding mechanism, including a winding platform 1, an unwinding arm 6 and a tension sensor 7.

[0025] The upper part of the winding table 1 is provided with a winding position 3, and an air expansion shaft 2 for winding the film roll is rotatably installed at the winding position 3. During winding, the film roll is sleeved on the air expansion shaft 2 and rotates synchronously with the air expansion shaft 2 to complete the winding.

[0026] The winding table 1 has an internal rotatable mounting shaft 5. One end of the unwinding arm 6 is fixedly mounted on the mounting shaft 5, allowing the unwinding arm 6 to rotate relative to the winding table 1 around the mounting shaft 5. There are two unwinding arms 6, located at opposite ends of the mounting shaft 5. The ends of the unwinding arms 6 are provided with receiving grooves for accommodating the air shaft 2.

[0027] The take-up table 1 is also equipped with a drive unit for driving the unwinding arm 6 to rotate around the mounting shaft 5. In a preferred embodiment, the drive unit is an unwinding cylinder 4. The cylinder body of the unwinding cylinder 4 is rotatably connected to the take-up table 1, and the piston rod output end of the unwinding cylinder 4 is fixedly connected to the middle of the unwinding arm 6 through a tension sensor 7. That is, one end of the tension sensor 7 is connected to the piston rod of the unwinding cylinder 4, and the other end is connected to the middle of the unwinding arm 6. By connecting the tension sensor 7 between the unwinding cylinder 4 and the unwinding arm 6, when the unwinding arm 6 receives the film roll, the tension sensor 7 can directly sense the force transmitted by the unwinding arm 6, realizing online real-time weighing. In this embodiment, the tension sensor 7 is a column-type tension sensor.

[0028] The take-up table 1 is also equipped with a pusher (not shown in the figure). The pusher is located on the side of the take-up position 3 away from the unwinding arm 6, and its output end faces the end of the air shaft 2. Preferably, the pusher is a cylinder or an electric cylinder. After the film roll is wound up, the pusher extends and pushes the air shaft 2 from the take-up position 3 toward the unwinding arm 6, so that both ends of the air shaft 2 fall smoothly onto the upper end face of the unwinding arm 6.

[0029] like Figure 2 and Figure 3 As shown, to prevent the film roll from accidentally slipping during unwinding, a stop bar 8 is slidably provided at the end of the unwinding arm 6 (i.e., the end away from the mounting shaft 5). The stop bar 8 is used to limit and block the air shaft 2 when the unwinding arm 6 is tilted down, preventing the air shaft 2 from accidentally slipping from the end of the unwinding arm 6. Specifically, a groove is provided at the end of the unwinding arm 6, and the stop bar 8 is slidably disposed in the groove and can extend and retract along the width direction of the unwinding arm 6.

[0030] like Figure 2 and Figure 3As shown, a push rod 9 is slidably connected to the unloading arm 6. A linkage is provided between the push rod 9 and the stop rod 8. This linkage is used to make the stop rod 8 and the push rod 9 slide in opposite directions. That is, when the push rod 9 slides inward, the stop rod 8 retracts inward simultaneously. When the push rod 9 slides outward, the stop rod 8 extends outward simultaneously.

[0031] As a preferred embodiment, such as Figure 2 and Figure 3 As shown, the linkage includes a lead screw 10. The lead screw 10 is rotatably mounted inside the unwinding arm 6, and spiral grooves with opposite directions of rotation are respectively opened on both sides of the lead screw 10. The stop rod 8 and the push rod 9 are threadedly connected to both ends of the lead screw 10.

[0032] Specifically, a first guide block is fixedly mounted on the stop rod 8, and this first guide block is slidably disposed in the helical groove at one end of the lead screw 10. A second guide block is fixedly mounted on the push rod 9, and this second guide block is slidably disposed in the helical groove at the other end of the lead screw 10. Since the helical grooves at both ends of the lead screw 10 rotate in opposite directions, when the push rod 9 slides axially, the second guide block forces the lead screw 10 to rotate, and the rotation of the lead screw 10, in turn, drives the stop rod 8 to slide in the opposite direction through the first guide block.

[0033] To achieve automatic reset of the structure, a spring 11 is fixedly connected between the push rod 9 and the unloading arm 6. The spring 11 provides the push rod 9 with an outward reset force. In its natural state, when there is no external force pressing the push rod 9, the spring 11 pushes the push rod 9 outward, which in turn drives the stop rod 8 to extend outward through the lead screw 10 and enter the blocking and limiting state.

[0034] Working principle:

[0035] After the film roll at the take-up position 3 is finished, the air shaft 2 carrying the finished film roll is pushed from the take-up position 3 to the unwinding arm 6 by a pusher (not shown in the figure). This causes both ends of the air shaft 2 to fall into the receiving grooves on the unwinding arms 6 on both sides.

[0036] The unwinding cylinder 4 drives the unwinding arm 6 to swing upwards and support the air shaft 2, so that the end of the unwinding arm 6 supports the air shaft 2 carrying the film roll. When the film roll is completely placed on the unwinding arm 6, the unwinding cylinder 4 pulls the unwinding arm 6 through the tension sensor 7 to balance the weight of the film roll. The tension sensor 7 senses the load on the film roll and calculates the actual weight of the film roll in real time, realizing simultaneous weighing during the unwinding process. There is no need to transport the film roll to additional equipment for secondary weighing.

[0037] After the weight check is completed, the unwinding cylinder 4 continues to operate, its piston rod retracts, driving the unwinding arm 6 to rotate downwards around the mounting shaft 5, causing the film roll to gradually descend with the unwinding arm 6. As the rotation angle of the unwinding arm 6 around the mounting shaft 5 gradually increases, when the rotation angle is greater than 90°, the air shaft 2 slides along the upper end face of the unwinding arm 6 under the action of the component of gravity until it abuts against the side wall of the stop rod 8. At this time, the stop rod 8 effectively blocks the air shaft 2, preventing the finished film roll from accidentally slipping off the end of the unwinding arm 6 due to inertia or gravity.

[0038] As the unloading arm 6 continues to rotate downwards, when the lower end of the push rod 9 contacts the receiving platform, the receiving platform applies an upward counter-force to the push rod 9, causing it to slide inwards against the elastic force of the spring 11. As the push rod 9 moves inwards, it drives the lead screw 10 to rotate. The rotation of the lead screw 10 causes the first guide block on the stop rod 8 to slide along the spiral groove. Since the spiral grooves at both ends of the lead screw 10 rotate in opposite directions, the stop rod 8 and the push rod 9 move in opposite directions, i.e., the stop rod 8 retracts inwards, thereby releasing the obstruction to the end of the air shaft 2. At this time, the air shaft 2, along with the finished film roll, automatically rolls down from the end of the unloading arm 6 onto the receiving platform, completing the unloading process.

[0039] After unwinding is completed, the unwinding cylinder 4 reverses its direction, causing the unwinding arm 6 to rotate upward around the mounting shaft 5, and the push rod 9 gradually disengages from the receiving platform. After losing the counter-pushing force from the receiving platform, the push rod 9 slides outward under the restoring force of the spring 11, and drives the stop rod 8 to extend outward and reset synchronously through the lead screw 10, so that it can receive the next finished film roll.

[0040] By installing a tension sensor 7 between the unloading arm 6 and the unloading cylinder 4, the film roll is weighed simultaneously during the unloading process, eliminating the need for a separate weighing procedure. This effectively saves labor and time, improving production efficiency. Simultaneously, a stop bar 8 effectively blocks the air shaft 2 when the unloading arm 6 rotates downwards for unloading, preventing the risk of the film roll accidentally slipping and improving operational safety. Furthermore, the push rod 9, lead screw 10, and spring 11 automatically release the stop bar 8 when the film roll reaches the receiving platform, allowing it to roll down automatically without additional power or manual intervention, further enhancing the automation and efficiency of the unloading process.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A weighing and unwinding mechanism, characterized in that: It includes a take-up table (1), an unwinding arm (6) and a tension sensor (7). One end of the unwinding arm (6) is rotatably connected to the take-up table (1) via a mounting shaft (5). A drive unit for driving the unwinding arm (6) to rotate is installed on the take-up table (1). The tension sensor (7) is installed between the output end of the drive unit and the unwinding arm (6). The end of the unloading arm (6) is slidably connected to a stop bar (8), which is used to limit the movement of the air shaft (2); The unloading arm (6) is slidably connected to a push rod (9), and a linkage is provided between the push rod (9) and the stop rod (8) to make the stop rod (8) and the push rod (9) slide in opposite directions; The linkage includes a lead screw (10), which has spiral grooves with opposite spiral directions on both sides. The stop rod (8) and push rod (9) are slidably connected to both sides of the lead screw (10). A first guide block is provided between the stop rod (8) and the lead screw (10), and the first guide block is slidably disposed in the corresponding spiral groove. A second guide block is provided between the push rod (9) and the lead screw (10), and the second guide block is slidably disposed in the corresponding spiral groove.

2. The weighing and unwinding mechanism according to claim 1, characterized in that: The driving component is a roll unloading cylinder (4).

3. The weighing and unwinding mechanism according to claim 1, characterized in that: The take-up station (1) is provided with a take-up position (3).

4. The weighing and unwinding mechanism according to claim 1, characterized in that: A spring (11) is fixedly connected between the push rod (9) and the unloading arm (6).

Images