Convenient adjustable bag opening mechanism of packing machine
The design of the multi-guide rod and electric hook assembly of the convenient and adjustable bag opening mechanism solves the problem of poor adaptability of traditional bag opening mechanisms, and achieves stable opening and efficient packaging of bags of different sizes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional bag opening mechanisms are difficult to adapt to packaging bags of different sizes, resulting in problems such as tearing of the bag opening or insufficient opening. In particular, when dealing with irregularly shaped packaging bags or express bags made of thicker materials, manual adjustment is required, which affects packing efficiency.
It adopts a convenient and adjustable bag opening mechanism, including multiple parallel guide rods and electric hook components. Through the reverse rotation design of the electric hook components and the rigid stop of the limit rod, the opening width can be infinitely adjusted from 5 to 60 cm. Combined with non-contact detection or optical path blocking detection signals, the stability and adaptability of the bag opening are ensured.
It improves the flexibility and stability of the bag opening mechanism, adapts to packaging bags of different sizes, reduces the risk of bag tearing, improves packaging efficiency, and shortens the single bag opening cycle.
Smart Images
Figure CN224029382U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to express packaging machine technical field especially is involved in a kind of convenient adjustable bag opening mechanism of packing machine. BACKGROUND
[0002] In the field of express logistics automation, the packaging machine needs to realize the accurate unfolding and positioning of the packaging bag through the bag opening device. The traditional bag opening mechanism mostly adopts fixed support or one-way opening structure, which has the following technical defects: 1. Single-degree-of-freedom opening action is difficult to adapt to packaging bags of different sizes, which may easily cause bag opening to tear or not to open sufficiently; 2. The existing double-bar structure generally has component motion trajectory interference, affecting the continuity and stability of the bag opening action; 3. In particular for irregularly shaped packaging bags or thickened material express bags, the conventional bag opening structure often needs manual secondary adjustment due to the lack of multi-state switching capability, which seriously restricts the packaging efficiency. Therefore, it is necessary to improve. SUMMARY
[0003] In view of the deficiencies in the prior art, the utility model aims to provide a convenient adjustable bag opening mechanism of packing machine, which can be quickly adapted and set according to the shape of the packaging bag and the packaging object to meet the stringent requirements of high-speed automatic packaging.
[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a convenient adjustable bag opening mechanism of packing machine, which comprises two fixed side frames and a guide rod connected between the two fixed side frames. The number of guide rods is two or more, and each guide rod is arranged in parallel. The bag opening mechanism further comprises two electric hook assemblies movably mounted on each guide rod. The two electric hook assemblies are provided with the same number of linear bearings as the guide rods. Each linear bearing has a mounting hole. The mounting hole of each linear bearing is fitted on the corresponding guide rod with a gap between the inner wall of the mounting hole and the outer wall of the guide rod to form a friction pair. An opening hook is rotatably arranged on the outer side of the electric hook assembly. The outer side of the opening hook forms an opening hook arm. The opening hook is connected to a hook driving device. The opening hook has an initial state and an opening state. When the opening hook is in the initial state, the opening hook arm of the opening hook is rotated to a position above its rotation axis to release the bag opening. When the opening hook is in the opening state, the opening hook arm of the opening hook is rotated to a position below its rotation axis to hook the bag opening. The rotation directions of the opening hooks on both sides are opposite. When opening the bag, the opening hook on the left side is rotated in the clockwise direction, and the opening hook on the right side is rotated in the counterclockwise direction. The opening width between the two opening hooks is adjustable.
[0005] In a further technical solution, the electric hook assembly comprises a sliding seat, and a linear bearing is fixedly installed at the bottom of the sliding seat; the hook driving device comprises a stepping motor, the stepping motor is fixed to the rear side of the sliding seat, the output shaft of the stepping motor extends to the front side of the sliding seat, and a bag supporting hook is fixed to the output shaft of the stepping motor; a limiting rod is arranged on the outer side of the sliding seat, the limiting rod is located in the rotation track of the corresponding bag supporting hook, and the limiting rod and the bag supporting hook are in blocking and limiting cooperation, when the bag supporting hook is blocked in the limiting rod, the bag supporting hook is in an initial state.
[0006] In a further technical solution, the width of the opening is 5cm-60cm.
[0007] In a further technical solution, the number of guide rods is two; when each linear bearing is axially displaced along the corresponding guide rod, the corresponding friction pair forms a resistance torque opposite to the direction of motion, and the resistance value is 2-20N·m.
[0008] In a further technical solution, the bag supporting hook comprises a right-angle type short hook or a Z-shaped long hook, both of which are provided with a bag supporting arm, and the radius of the rotation track of the bag supporting arm of the right-angle type short hook is smaller than that of the bag supporting arm of the Z-shaped long hook.
[0009] In a further technical solution, the right-angle type short hook comprises a rotating arm, the end of the rotating arm is provided with a sleeve hole for sleeving the rotating shaft and fixed by a bolt; the bag supporting arm is formed at the outer end of the rotating arm, and the included angle between the two is 90°-95°, and the length of the rotating arm is 3mm-5mm.
[0010] In a further technical solution, the Z-shaped long hook is sequentially formed with a fork arm, a bent arm and a bag supporting arm, the fork arm and the bag supporting arm are arranged in parallel, and the connection portions of the two and the bent arm form an included angle of greater than 120 degrees, and the three are connected to form a "Z" shape; a sleeve hole is formed at the middle position of the fork arm for sleeving the rotating shaft, and the fork arm is also provided with an open slot extending along the length direction, and coaxially arranged through holes are formed on both sides of the fork arm, a locking bolt is inserted between the two through holes for locking the open slot, so that the sleeve hole is locked on the rotating shaft.
[0011] In a further technical solution, a control circuit is connected to the hook driving device; the electric hook assembly is provided with a reset sensing structure, the reset sensing structure is signal connected to the control circuit to collect the state data of the bag supporting hook, and sends an electric signal representing the start or end of the working cycle to the control circuit to realize the measurement of the intermittent cycle of the continuous bag opening mechanism, and the reset sensing structure comprises an inductive distance switch reset structure or a groove photoelectric switch reset structure.
[0012] In a further technical solution, the induction distance switch type reset structure includes a cylindrical induction probe, the cylindrical induction probe is fixed to the outside of the electric hook assembly, the induction area of the cylindrical induction probe overlaps the rotation track of the bag opening hook, when the bag opening hook rotates to the induction area of the cylindrical induction probe and triggers the cylindrical induction probe, the bag opening hook is in the initial state, and the cylindrical induction probe sends an electric signal representing the end of the bag opening working period to the control circuit.
[0013] In a further technical solution, the slot type photoelectric switch reset structure includes a slot switch and a trigger piece, the slot switch is fixed to the electric hook assembly; the trigger piece is fixedly installed on the rotating shaft of the bag opening hook, and the rotation track of the trigger piece passes through the induction slot of the slot switch, when the rotation track of the trigger piece passes through the induction slot of the slot switch, the slot switch sends an electric signal representing the start of the bag opening working period or the end of the bag opening working period to the control circuit.
[0014] After adopting the above structure, the utility model has the advantages compared with the prior art:
[0015] 1. The electric hook assembly can realize stepless adjustment in a 5-60cm opening width range, the flexibility and working stability of the bag opening mechanism are improved, different sizes of packaging bags can be adapted, and the adaptability and operation efficiency of the bag opening mechanism of the express packaging machine are improved.
[0016] 2. The step motor is driven to cooperate with the hard stop of the limiting rod, so that the positioning error of the initial state of the bag opening hook is less than or equal to ±0.5°, and the mechanism interference caused by rotation overtravel is avoided.
[0017] 3. The left and right bag opening hooks are designed to rotate in opposite directions, a symmetrical bag opening force field is formed, the risk of bag opening tearing caused by unilateral hooking is reduced, and the damage rate of the packaging bag is reduced by 67% compared with the traditional mechanism.
[0018] 4. The cylindrical probe realizes non-contact detection or light path interruption detection, realizes millisecond level response (less than or equal to 5ms) of the bag opening period start / end signal, cooperates with the control circuit to complete accurate measurement of continuous operation, and shortens the single bag opening period to 1.2 seconds. BRIEF DESCRIPTION OF DRAWINGS
[0019] The utility model will be further described below in combination with the drawings and examples.
[0020] Figure 1 is the working schematic view of the bag opening mechanism shown in example 1.
[0021] Figure 2 is the structural schematic view of the bag opening mechanism shown in example 1.
[0022] Figure 3 is the working schematic view of the bag opening mechanism shown in example 2.
[0023] Figure 4 is a structural schematic view of the bag opening supporting mechanism shown in embodiment 2. DETAILED DESCRIPTION
[0024] The following are only preferred embodiments of the utility model, and do not limit the protection scope of the utility model.
[0025] Embodiment 1
[0026] As shown in Figure 1 and Figure 2 A convenient adjustable bag opening supporting mechanism of a packing machine comprises two fixed side frames 9 and guide rods 91 connected between the two fixed side frames 9, the number of guide rods 91 is two or more, each guide rod 91 is arranged in parallel, the bag opening supporting mechanism further comprises two electric hook assemblies 1 movably installed on each guide rod 91, the two electric hook assemblies 1 are provided with linear bearings 10 in the same number as the guide rods 91, each linear bearing 10 is provided with a mounting hole, the mounting hole of each linear bearing 10 is sleeved on the corresponding guide rod 91, the inner wall of the mounting hole and the outer wall of the guide rod 91 are in clearance fit and form a friction pair, the outer side of the electric hook assembly 1 is rotatably provided with a bag supporting hook, the outer side of the bag supporting hook is provided with a bag supporting arm 22, the bag supporting hook is connected with a hook driving device, the bag supporting hook has an initial state and a bag supporting state, when the bag supporting hook is in the initial state, the bag supporting arm 22 of the bag supporting hook is rotated to a position above the rotation shaft thereof to release the bag opening; when the bag supporting hook is in the bag supporting state, the bag supporting arm 22 of the bag supporting hook is rotated to a position below the rotation shaft thereof to hook the bag opening, the rotation directions of the bag supporting hooks on the two sides are opposite, when supporting the bag opening, the bag supporting hook on the left side is rotated in clockwise direction, the bag supporting hook on the right side is rotated in counterclockwise direction, and the two bag supporting hooks form an adjustable opening width.
[0027] The electric hook assembly 1 can realize stepless adjustment within the opening width range of 5-60 cm, improve the flexibility and working stability of the bag opening supporting mechanism, adapt to packaging bags of different sizes, and improve the adaptability and operation efficiency of the bag opening supporting mechanism of the express packing machine.
[0028] Specifically, the electric hook assembly 1 comprises a sliding seat, and the linear bearing 10 is fixedly installed on the bottom of the sliding seat; the hook driving device comprises a stepping motor 12, the stepping motor 12 is fixed to the rear side of the sliding seat, the output shaft of the stepping motor 12 extends to the front side of the sliding seat, and the bag supporting hook is fixed to the output shaft of the stepping motor 12; the outer side of the sliding seat is provided with a limiting rod 11, the limiting rod 11 is in the rotation track of the corresponding bag supporting hook, and the limiting rod 11 and the bag supporting hook are in blocking and limiting fit, when the bag supporting hook is blocked in the limiting rod 11, the bag supporting hook is in the initial state.
[0029] The servo motor 12 drives the hard stop of the matching limiting rod 11 to ensure that the positioning error of the bag supporting hook in the initial state is less than or equal to ±0.5°, and to avoid mechanism interference caused by rotation overtravel.
[0030] Specifically, the opening width is 5cm-60cm.
[0031] The left and right bag supporting hooks are designed to rotate in opposite directions to form a symmetrical bag supporting force field, thereby reducing the risk of bag opening tearing caused by unilateral hooking, and reducing the bag damage rate by 67% compared with the traditional mechanism.
[0032] Specifically, the number of guide rods 91 is two; when each linear bearing 10 produces axial displacement along the corresponding guide rod 91, the corresponding friction pair forms a resistance torque opposite to the direction of motion, and the resistance value is 2-20N·m.
[0033] Specifically, the bag supporting hook is a right-angle type short hook 2, which includes a rotating arm 21, and the end of the rotating arm 21 is provided with a sleeve hole for sleeving and fixing the rotating shaft; a bag supporting hook arm 22 is formed at the outer end of the rotating arm 21, and the angle between the two is 92°, and the length of the rotating arm 21 is 3mm-5mm.
[0034] The right-angle type short hook 2 arranged in a right angle has outward hooking effect on the two sides of the bag supporting hook arm 22 in the bag supporting state, which can improve the lifting force of the bag hooking, improve the bearing capacity during packaging, and is more stable and less likely to fall off the bag.
[0035] Specifically, the electric hook assembly 1 is provided with a control circuit connected with the hook driving device, the servo motor 12 is controlled through the control circuit to control the rotation angle of the bag supporting hook, and the switching between the initial state and the bag supporting state of the bag supporting hook is realized; the electric hook assembly 1 is provided with a reset sensing structure, the reset sensing structure is signal connected with the control circuit to collect the state data of the bag supporting hook, and sends an electric signal representing the beginning or end of the working cycle to the control circuit to realize the measurement of the intermittent period of the continuous bag opening mechanism, and the reset sensing structure in the embodiment is an induction distance switch reset structure, which includes a cylindrical induction probe 3 fixed to the outside of the electric hook assembly 1, the induction area of the cylindrical induction probe 3 overlaps with the rotation track of the bag supporting hook, when the bag supporting hook rotates to the induction area of the cylindrical induction probe 3 and triggers the cylindrical induction probe 3, the bag supporting hook is in the initial state, and the cylindrical induction probe 3 sends an electric signal representing the end of the bag opening working cycle to the control circuit.
[0036] The non-contact detection of the cylindrical probe or the light path blocking detection realizes the millisecond level response of the bag supporting cycle start / end signal, and the control circuit completes the accurate measurement of the continuous work, and the single bag supporting cycle is shortened to 1.2 seconds.
[0037] Embodiment 2
[0038] As shown in Figure 3 and Figure 4 The bag opening supporting mechanism of the present embodiment is basically the same as the above-mentioned embodiments, except that the bag opening supporting hook of the present embodiment is a Z-shaped long hook 4, which is sequentially formed with a fork arm 41, a bent arm 42 and a bag opening supporting arm 22. The fork arm 41 and the bag opening supporting arm 22 are arranged in parallel, and the connection between the two and the bent arm 42 forms an included angle of more than 120 degrees, and the three are connected to form a "Z" shape. A sleeve hole is formed in the middle of the fork arm 41 for sleeving the rotating shaft, and the fork arm 41 is also provided with an open slot 40 extending along its length direction, and coaxial through holes are formed on both sides of the fork arm 41, and a locking bolt is inserted between the two through holes for locking the open slot 40, so as to realize the locking of the sleeve hole on the rotating shaft.
[0039] The bag opening supporting arm 22 is longer, which is suitable for larger packaging bags.
[0040] In addition, the reset sensing structure of the present embodiment is a groove type photoelectric switch reset structure, wherein the output shaft 121 of the servo motor 12 extends to the rear side thereof, and the rear side of the sliding seat is provided with a hanging bracket 15.
[0041] The groove type photoelectric switch reset structure includes a groove type switch 16 and a trigger piece 14, and the groove type switch 16 is fixed to the hanging bracket 15. The trigger piece 14 is fixedly installed on the output shaft 121 of the servo motor 12 and is locked and fixed by a locking ring 13. The rotation track of the trigger piece 14 passes through the sensing groove of the groove type switch 16. When the rotation track of the trigger piece 14 passes through the sensing groove of the groove type switch 16, the groove type switch 16 sends an electrical signal to control the circuit, which represents the start of the bag opening supporting work cycle or the end of the bag opening supporting work cycle.
[0042] The intermittent points of the start of the work cycle and the end of the work cycle are recorded, which can more accurately control the time control of the cycle interval and facilitate the packaging operation of operators with different proficiency.
[0043] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.
Claims
1. A convenient and adjustable bag opening support mechanism for a packing machine, characterized in that: It includes two fixed side frames (9) on both sides and guide rods (91) connecting the two fixed side frames (9). There are two or more guide rods (91), and the guide rods (91) are arranged in parallel. The bag opening mechanism also includes two electric hook assemblies (1) movably mounted on each guide rod (91). These two electric hook assemblies (1) are equipped with the same number of linear bearings (10) as the guide rods (91). Each linear bearing (10) has a mounting hole, and the mounting hole of each linear bearing (10) is fitted onto the corresponding guide rod (91). The inner wall of the mounting hole and the outer wall of the guide rod (91) are in clearance fit, forming a friction pair. An electric hook assembly (1) has a bag-supporting hook rotatably mounted on its outer side. The outer section of the bag-supporting hook forms a bag-supporting arm (22). The bag-supporting hook is connected to a hook drive device. The bag-supporting hook has an initial state and a bag-supporting state. When the bag-supporting hook is in the initial state, the bag-supporting arm (22) of the bag-supporting hook rotates to a position above its rotation axis to release the bag opening. When the bag-supporting hook is in the bag-supporting state, the bag-supporting arm (22) of the bag-supporting hook rotates to a position below its rotation axis to hook the bag opening. The two bag opening hooks rotate in opposite directions. When opening the bag, the bag opening hook on the left rotates clockwise and the bag opening hook on the right rotates counterclockwise, creating an adjustable opening width between the two bag opening hooks.
2. The convenient and adjustable bag opening support mechanism of a packaging machine according to claim 1, characterized in that: The electric hook assembly (1) includes a sliding seat, and the linear bearing (10) is fixedly installed at the bottom of the sliding seat; the hook drive device includes a stepper motor (12), the stepper motor (12) is fixed to the rear side of the sliding seat, the output shaft of the stepper motor (12) extends to the front side of the sliding seat, and the bag support hook is fixed to the output shaft of the stepper motor (12); a limiting rod (11) is provided on the outside of the sliding seat, the limiting rod (11) is in the rotation trajectory of the corresponding bag support hook, and the limiting rod (11) and the bag support hook are in a blocking and limiting cooperation. When the bag support hook rotates and is blocked by the limiting rod (11), the bag support hook is in the initial state.
3. The convenient adjustable bag opening support mechanism of a packaging machine according to claim 2, characterized in that: The width of the opening is 5cm-60cm.
4. The convenient adjustable bag opening support mechanism of a packaging machine according to claim 3, characterized in that: The number of guide rods (91) is two; when each linear bearing (10) generates axial displacement along the corresponding guide rod (91), the corresponding friction pair forms a resistance torque opposite to the direction of motion, and its resistance value is 2-20 N·m.
5. The convenient and adjustable bag opening support mechanism of a packaging machine according to claim 1, characterized in that: The bag support hook includes a right-angled short hook (2) or a Z-shaped long hook (4), both of which are equipped with the bag support arm (22). The radius of the rotation trajectory of the bag support arm (22) of the right-angled short hook (2) is smaller than the radius of the rotation trajectory of the bag support arm (22) of the Z-shaped long hook (4).
6. The convenient adjustable bag opening support mechanism of a packing machine according to claim 5, characterized in that: The right-angled short hook (2) includes a rotating arm (21), and the end of the rotating arm (21) is provided with a sleeve hole for mounting and fixing its rotating shaft; The bag support arm (22) is formed on the outer end of the rotating support arm (21), and the two form an angle of 90°-95°. The length of the rotating support arm (21) is 3mm-5mm.
7. The convenient adjustable bag opening support mechanism of a packaging machine according to claim 5, characterized in that: The Z-shaped long hook (4) is formed in sequence with a fork arm (41), a bending arm (42) and a bag-supporting hanging arm (22). The fork arm (41) and the bag-supporting hanging arm (22) are arranged in parallel. The connection between the two and the bending arm (42) forms an angle greater than 120 degrees. The three are connected to form a "Z" shape. A sleeve hole is opened in the middle of the fork arm (41) for fitting its rotating shaft. The fork arm (41) is also opened with an opening groove (40) which extends along its length. Coaxial through holes are opened on both sides of the fork arm (41). A locking bolt is inserted between the two through holes to lock the opening groove (40), thereby locking the sleeve hole to the rotating shaft.
8. The convenient adjustable bag opening support mechanism of a packaging machine according to claim 1, characterized in that: It includes a control circuit, which is connected to the hook drive device; the electric hook assembly (1) is provided with a reset sensing structure, which is connected to the control circuit to collect the status data of the bag-holding hook and send an electrical signal representing the start or end of the working cycle to the control circuit, so as to realize the measurement of the periodic interval of the continuous bag-holding mechanism. The reset sensing structure includes a distance-sensing switch type reset structure or a slot-type photoelectric switch type reset structure.
9. A convenient and adjustable bag opening support mechanism for a packing machine according to claim 8, characterized in that: The sensing distance switch type reset structure includes a cylindrical sensing probe (3), which is fixed to the outside of the electric hook assembly (1). The sensing area of the cylindrical sensing probe (3) overlaps with the rotation trajectory of the bag-holding hook. When the bag-holding hook rotates to the sensing area of the cylindrical sensing probe (3) and triggers the cylindrical sensing probe (3), the bag-holding hook is in the initial state. The cylindrical sensing probe (3) sends an electrical signal representing the end of the working cycle of the bag-holding opening to the control circuit.
10. A convenient and adjustable bag opening support mechanism for a packaging machine according to claim 8, characterized in that: The slotted photoelectric switch reset structure includes a slotted switch (16) and a trigger plate (14). The slotted switch (16) is fixed to the electric hook assembly (1). The trigger plate (14) is fixedly installed on the rotating shaft of the bag-holding hook. The rotation trajectory of the trigger plate (14) passes through the sensing slot of the slotted switch (16). When the rotation trajectory of the trigger plate (14) passes through the sensing slot of the slotted switch (16), the slotted switch (16) sends an electrical signal representing the start or end of the bag-holding working cycle to the control circuit.