A device for sealing and cornering a film envelope

Abstract

This utility model provides a wrapping, sealing, and corner-cutting device, including a sealing mechanism, a corner-cutting mechanism, and a conveying mechanism. The sealing mechanism is configured to heat-seal the open end of the wrapped semi-finished product to obtain the finished box. The conveying mechanism, in the form of a conveyor belt, carries the finished box sequentially through the sealing mechanism and the corner-cutting mechanism. The corner-cutting mechanism includes a first corner-cutting mechanism and a second corner-cutting mechanism. The sealing mechanism is positioned upstream of the corner-cutting mechanism. First, the open end of the wrapped semi-finished product is heat-sealed to obtain the finished box. Then, the sealed box is corner-cut and partially resealed, fundamentally avoiding edge damage and leakage caused by cutting before sealing. The first and second sensors are used to detect when the semi-finished product reaches the sealing position and when the box reaches the corner-cutting position, respectively, thereby achieving segmented detection and precise triggering, effectively compensating for conveyor belt speed fluctuations or positional deviations, and reducing many risks such as misaligned cutting and tool collisions.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, and more specifically, to a coating sealing and corner cutting device. Background Technology

[0002] In existing packaging production lines, wrapped boxes typically require two steps—sealing and corner cutting—before the final product can be output. Common methods currently available include: completing corner cutting and sealing on the same side or at a single station; cutting corners before sealing; or simply trimming the corners without subsequent sealing. However, such corner cutting methods easily lead to asymmetrical corner treatment, low throughput, and even the need for manual finishing, severely impacting production cycle time and consistency. In particular, the reliance on mechanical gear shifting or conveyor belt step control, coupled with a lack of segmented sensor detection, makes the production prone to misaligned cutting, tool impact, or defective products when the conveyor belt speed fluctuates, slips, or the semi-finished product's dimensions deviate. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a wrapping and sealing corner cutting device to solve the above problems.

[0004] The present invention adopts the following solution:

[0005] This application provides a film-sealing and corner-cutting device, including a sealing mechanism, a corner-cutting mechanism, and a conveying mechanism. The sealing mechanism is configured to heat-seal the open end of the film-sealed semi-finished product to obtain a finished box. The conveying mechanism, via a conveyor belt, carries the finished box sequentially through the sealing mechanism and the corner-cutting mechanism. The corner-cutting mechanism includes a first corner-cutting mechanism on the left and a second corner-cutting mechanism on the right. The first and second corner-cutting mechanisms are movably positioned opposite each other along the X-axis on both sides of the conveying mechanism. The first corner-cutting mechanism includes two cooperating first drive bases and a sealing knife assembly mounted on the first drive bases. The first drive bases can move synchronously towards or away from each other along the Y-axis, and the first drive bases can drive the sealing knife assembly to seal the box. The blade assembly moves freely along the X-axis; the second corner-cutting mechanism includes two cooperating second drive bases and another sealing blade assembly disposed on the second drive bases; the second drive bases can move synchronously towards or away from each other along the Y-axis, and the second drive bases can drive the other sealing blade assembly to move freely along the X-axis; each sealing blade assembly includes a front sealing blade group for cutting and sealing the two front corners of the finished box wrapping, and a rear sealing blade group for cutting and sealing the two rear corners of the finished box wrapping; it also includes at least a first sensor disposed on the upstream side of the transmission mechanism along the transmission direction, and a second sensor on the midstream side; the first sensor is used to detect when the semi-finished product enters the position to be sealed, and the second sensor is used to detect when the finished box enters the position to be cut.

[0006] As a further improvement, the two front sealing knife groups at the front end share the same bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting off the two front corners of the sealing membrane; the two rear sealing knife groups at the rear end share another bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting off the two rear corners of the sealing membrane.

[0007] As a further improvement, the first drive base and the second drive base located on the front side are respectively provided with their respective front sealing knife groups, and the first drive base and the second drive base located on the rear side are respectively provided with their respective rear sealing knife groups.

[0008] As a further improvement, the two first drive bases and the two second drive bases are each equipped with their own bidirectional lead screw mechanism.

[0009] As a further improvement, both the front sealing knife group and the rear sealing knife group include sealing knives, levers, and support components; the two front sealing knife groups are symmetrically arranged to heat-seal the two front corners of the finished box located at the first corner cutting station; the two rear sealing knife groups are symmetrically arranged to heat-seal the two rear corners of the finished box located at the second corner cutting station.

[0010] As a further improvement, the first sensor is configured as a photoelectric pair, respectively positioned on the left and right sides of the transmission mechanism adjacent to the sealing mechanism.

[0011] As a further improvement, the second sensor is configured as another photoelectric pair, respectively positioned on the left and right sides of the transmission mechanism before entering the chamfering mechanism.

[0012] As a further improvement, a buffer path is formed on the conveyor belt where the transmission mechanism between the first sensor and the second sensor is located.

[0013] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0014] 1. The film-sealing and corner-cutting device of this application sets the sealing mechanism upstream of the corner-cutting mechanism. It first heat-seals the open end of the semi-finished product after film sealing to obtain the finished box, and then cuts the corners and performs partial secondary sealing on the sealed box. This fundamentally avoids the edge damage and leakage problems caused by cutting before sealing, and ensures the integrity and reliability of the sealing surface.

[0015] 2. The system employs a first and a second corner-cutting mechanism located on both sides of the transmission mechanism, which can move in opposite directions along the X-axis. Each sealing assembly includes a front sealing knife group and a rear sealing knife group, which can cut off and reseal the front and rear corners of the box, ensuring that the corners on both sides are symmetrical and consistent. This significantly reduces defects such as off-center cutting, residual corners, and incomplete sealing, thereby improving the yield rate. The box is then continuously transported by the conveyor belt used in the transmission mechanism. The corner-cutting mechanisms on both sides can work in parallel or alternately. With the help of sensor closed-loop trigger control, the idle travel and waiting time are reduced, thereby improving the production cycle and the overall throughput of the line.

[0016] 3. The first sensor on the upstream side and the second sensor on the midstream side, which are set in the transmission direction, are used to detect when the semi-finished product reaches the sealing position and when the box reaches the corner cutting position, respectively, so as to realize segmented detection and precise triggering, effectively compensate for the speed fluctuation or position deviation of the conveyor belt, and reduce many risks such as misaligned cutting and tool collision. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the wrapping and sealing corner cutting device according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the wrapping and sealing corner cutting device according to an embodiment of the present invention from other perspectives;

[0019] Figure 3 This is a schematic diagram of the structure of the film sealing corner cutting device after the sealing mechanism is hidden, according to an embodiment of the present invention.

[0020] Icons: 1-Sealing mechanism; 2-Corner cutting mechanism; 21-First corner cutting mechanism; 22-Second corner cutting mechanism; 23-First drive base; 24-Second drive base; 25-Front sealing knife assembly; 26-Rear sealing knife assembly; 3-Transmission mechanism; 31-Conveyor belt; 32-Buffer path; 4-First sensor; 5-Second sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0022] Example

[0023] Combination Figures 1 to 3 This embodiment provides a film sealing and corner cutting device, including a sealing mechanism 1, a corner cutting mechanism 2, and a transmission mechanism 3.

[0024] The sealing mechanism 1 is configured to heat-seal the open end of the wrapped semi-finished product to obtain the finished box. The conveying mechanism 3, via a conveyor belt 31, carries the finished box sequentially through the sealing mechanism 1 and the corner-cutting mechanism 2. The corner-cutting mechanism 2 includes a first corner-cutting mechanism 21 located on the left and a second corner-cutting mechanism 22 located on the right. The first corner-cutting mechanism 21 and the second corner-cutting mechanism 22 are movably positioned on opposite sides of the conveying mechanism 3 along the X-axis.

[0025] The first corner-cutting mechanism 21 includes two cooperating first drive bases 23 and a sealing knife assembly disposed on the first drive bases 23. The first drive bases 23 can move synchronously towards or away from each other along the Y-axis, and the first drive bases 23 can drive the sealing knife assembly to move freely along the X-axis.

[0026] Correspondingly, the second corner-cutting mechanism 22 includes two cooperating second drive bases 24 and another sealing knife assembly disposed on the second drive bases 24. The second drive bases 24 can move synchronously towards or away from each other along the Y-axis direction, and the second drive bases 24 can drive the other sealing knife assembly to move freely along the X-axis direction.

[0027] Specifically, each sealing knife assembly includes a front sealing knife group 25 for cutting and sealing the two front corners of the finished box wrapping, and a rear sealing knife group 26 for cutting and sealing the two rear corners of the finished box wrapping.

[0028] Furthermore, the film sealing and corner-cutting device also includes a first sensor 4 disposed on the upstream side of the conveying mechanism 3 along the conveying direction, and a second sensor 5 disposed on the midstream side. The first sensor 4 is used to detect when the semi-finished product enters the sealing position, and the second sensor 5 is used to detect when the finished box enters the corner-cutting position.

[0029] The aforementioned film-sealing and corner-cutting device places the sealing mechanism 1 upstream of the corner-cutting mechanism 2. It first heat-seals the open end of the semi-finished product after film sealing to obtain the finished box, and then cuts the corners and performs partial secondary sealing on the sealed box. This fundamentally avoids edge damage and leakage caused by cutting before sealing, ensuring the integrity and reliability of the sealing surface.

[0030] The first corner-cutting mechanism 21 and the second corner-cutting mechanism 22, located on both sides of the transmission mechanism 3 and capable of moving towards each other along the X-axis, and each sealing knife assembly including a front sealing knife group 25 and a rear sealing knife group 26, can cut off and reseal the front and rear corners of the box, ensuring that the corners on both sides are symmetrical and consistent, significantly reducing defects such as cutting deviation, residual corners and missing seals, and improving the yield rate. The box is then continuously transported by the conveyor belt 31 used by the transmission mechanism 3. The corner-cutting mechanisms 2 on the left and right sides can work in parallel or alternately. With the help of sensor closed-loop trigger control, the idle stroke and waiting time are reduced, thereby improving the production cycle and the throughput of the entire line.

[0031] The upstream first sensor 4 and the midstream second sensor 5, which are set in the transmission direction, are used to detect when the semi-finished product reaches the sealing position and when the box reaches the corner cutting position, respectively, so as to realize segmented detection and precise triggering, effectively compensate for the speed fluctuation or position deviation of the conveyor belt 31, and reduce many risks such as misaligned cutting and tool collision.

[0032] It should be noted that the sealing mechanism 1 includes an upper heat-sealing assembly and a lower heat-sealing assembly (not shown in the figure), which work together to perform a heat-sealing operation on the open end of the plastic film. Obviously, the sealing mechanism 1 is a commonly used heat-sealing assembly on the market, and its specific structure will not be described in detail here.

[0033] In addition, the transmission mechanism 3 is based on a planar conveyor belt 31, which consists of a driving structure, a driven structure, a tensioning structure, and a conveying guide rail. To prevent slippage and ensure positioning accuracy, positioning blocks or laser rangefinders can be installed on the conveyor belt 31 for position correction. In this embodiment, preferably, a buffer path 32 should be formed on the conveyor belt 31 between the first sensor 4 and the second sensor 5 to achieve cycle buffering, speed matching, or brief pause between sealing and corner cutting to complete the subsequent corner cutting action.

[0034] Specifically, the first sensor 4 is configured as a photoelectric pair, positioned on the left and right sides of the transmission mechanism 3 adjacent to the sealing mechanism 1. The second sensor 5 is configured as another photoelectric pair, positioned on the left and right sides of the transmission mechanism 3 before entering the corner-cutting mechanism 2. When the semi-finished product enters the sealing position and blocks the photoelectric pair, the control center receives a signal from the first sensor 4. After the semi-finished product has completely passed through and the blocking of the photoelectric pair is lifted, the sealing mechanism 1 is immediately triggered to execute the heat-sealing procedure. The photoelectric pairs on the left and right sides can be used to determine whether the semi-finished product is tilted or lateral, and to compensate or alarm. When the finished box is about to enter the corner-cutting position and blocks the photoelectric pair, the preparatory actions of the corner-cutting mechanism 2 are triggered, such as clamping in the Y-axis direction, resetting the sealing knife in the X-axis direction, and preheating the heater, etc.

[0035] like Figure 2 and Figure 3As shown, in this embodiment, the two front sealing knife groups 25 located at the front end share the same bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting and sealing the two front corners of the membrane. The two rear sealing knife groups 26 located at the rear end share another bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting and sealing the two rear corners of the membrane. Obviously, the two left-right symmetrical sealing knife groups can be driven by the existing single bidirectional lead screw mechanism, achieving synchronization in stroke, speed, and phase, ensuring that the cutting and sealing actions of the membrane corners on both sides are performed simultaneously and symmetrically, reducing problems such as cutting deviation, inconsistent dimensions, or poor sealing on one side caused by asynchrony.

[0036] In other embodiments, the bidirectional lead screw mechanism can also be replaced by a planetary ball screw, a double-ended cylinder, or other similar mechanism, all of which fall within the scope of protection of this case.

[0037] like Figure 2 and Figure 3 As shown, in this embodiment, the first drive base 23 and the second drive base 24 located on the front side are respectively provided with their respective front sealing knife groups 25, and the first drive base 23 and the second drive base 24 located on the rear side are respectively provided with their respective rear sealing knife groups 26. Therefore, the two identical drive bases respectively support the front sealing knife groups 25 and the rear sealing knife groups 26, making the mechanical structure, transmission, and action of the front and rear workstations independent. This significantly reduces mutual interference between the front and rear cutting and sealing operations, ensuring the stability and repeatability of their respective actions.

[0038] By integrating the front and rear sealing blades onto independent drive bases, the mechanical and control functions of the front and rear workstations are separated, thereby reducing mutual interference between workstations, improving the positioning accuracy of the cutting and sealing action, and greatly optimizing the corner cutting and heat sealing efficiency of the production line.

[0039] It is understood that the two first drive bases 23 and the two second drive bases 24 are each equipped with their own bidirectional lead screw mechanism. The two drive bases on the same side also adopt a bidirectional synchronous drive method. The two front sealing knife groups 25 or rear sealing knife groups 26 on the drive bases on different sides of the front or rear end also achieve synchronous operation of the two sealing knife groups on the same side along the Y-axis or the two different sides along the X-axis by placing the bidirectional lead screw mechanism horizontally between the two drive bases on different sides.

[0040] Furthermore, both the front sealing knife group 25 and the rear sealing knife group 26 include sealing knives, levers, and support members (not shown in the figure). The improvements involved in this case are not included in the knife groups. Clearly, the two front sealing knife groups 25 are symmetrically arranged to heat-seal the two front corners of the finished box at the first corner-cutting station. The two rear sealing knife groups 26 are symmetrically arranged to heat-seal the two rear corners of the finished box at the second corner-cutting station.

[0041] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

Claims

1. A film-sealing corner-cutting device, characterized in that, This includes a sealing mechanism, a corner-cutting mechanism, and a conveying mechanism; The sealing mechanism is configured to heat-seal the open end of the wrapped semi-finished product to obtain the finished box. The transmission mechanism, in the form of a conveyor belt, is used to drive the finished box through the sealing mechanism and the corner-cutting mechanism in sequence; The corner-cutting mechanism includes a first corner-cutting mechanism located on the left and a second corner-cutting mechanism located on the right; the first corner-cutting mechanism and the second corner-cutting mechanism are movably arranged on both sides of the transmission mechanism along the X-axis. The first corner-cutting mechanism includes two cooperating first drive bases and a sealing knife assembly disposed on the first drive bases; the first drive bases can move synchronously towards or away from each other along the Y-axis direction, and the first drive bases can drive the sealing knife assembly to move freely along the X-axis direction. Furthermore, the second corner-cutting mechanism includes two cooperating second drive bases and another sealing knife assembly disposed on the second drive bases; the second drive bases can move synchronously towards or away from each other along the Y-axis direction, and the second drive bases can drive the other sealing knife assembly to move freely along the X-axis direction; Furthermore, each sealing assembly includes a front sealing knife group for cutting and sealing the two front corners of the finished box wrapping, and a rear sealing knife group for cutting and sealing the two rear corners of the finished box wrapping; it also includes at least a first sensor disposed on the upstream side of the transmission mechanism along the transmission direction, and a second sensor disposed on the midstream side; the first sensor is used to detect when the semi-finished product enters the position to be sealed, and the second sensor is used to detect when the finished box enters the position to be cut corners.

2. The film sealing and corner cutting device according to claim 1, characterized in that, The two front sealing knife groups located at the front end share the same bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting off the front corners of the two sealing films; the two rear sealing knife groups located at the rear end share another bidirectional lead screw mechanism to move towards or away from each other along the X-axis when cutting off the rear corners of the two sealing films.

3. The film-sealing and corner-cutting device according to claim 1, characterized in that, The first drive base and the second drive base located on the front side are respectively equipped with their respective front sealing knife groups, and the first drive base and the second drive base located on the rear side are respectively equipped with their respective rear sealing knife groups.

4. The film sealing and corner cutting device according to claim 3, characterized in that, Each of the two first drive bases and the two second drive bases is equipped with its own bidirectional lead screw mechanism.

5. The film sealing and corner cutting device according to claim 1, characterized in that, Both the front sealing knife group and the rear sealing knife group include sealing knives, levers, and support components; the two front sealing knife groups are symmetrically arranged and are used to heat-seal the two front corners of the finished box located at the first corner cutting station; the two rear sealing knife groups are symmetrically arranged and are used to heat-seal the two rear corners of the finished box located at the second corner cutting station.

6. The film sealing and corner cutting device according to claim 1, characterized in that, The first sensor is configured as a photoelectric pair, which is respectively positioned on the left and right sides of the transmission mechanism adjacent to the sealing mechanism.

7. The wrapping and sealing corner-cutting device according to claim 6, characterized in that, The second sensor is configured as another photoelectric pair, which are respectively positioned on the left and right sides of the transmission mechanism before entering the chamfering mechanism.

8. The film sealing and corner cutting device according to claim 7, characterized in that, A buffer path is formed on the conveyor belt where the transmission mechanism between the first sensor and the second sensor is located.

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