Internal heating type ironing head of strapping machine

Abstract

The utility model relates to the technical field of packaging machines, in particular to an internal heating type ironing head of a strapping machine, which comprises an ironing head shell, a cover plate, a heating element and a temperature measuring element, an opening is arranged on the top surface of the ironing head shell, and the cover plate is connected with the ironing head shell in the opening through a connecting piece; a first groove matched with the heating element in shape is formed in the inner bottom face of the ironing head shell, and the heating element is placed in the first groove. The side edge of the first groove is also provided with a second groove used for placing a temperature measuring element. According to the scheme, the heating element is embedded into the ironing head shell, and the groove is formed, so that the thickness of the shell is reduced, and the heat conduction speed is increased; and the temperature measuring element is also embedded into the groove in the ironing head shell, so that the temperature measuring device has the characteristics of high temperature detection precision, high feedback speed and high sensitivity, and the sealing quality of the strapping tape and the packaging firmness are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing machine technical field especially relates to a kind of bundling machine inner hot ironing head. BACKGROUND

[0002] Bundling machine is a kind of equipment using plastic material binding belt winding product, when binding belt reaches specified position, need to utilize ironing head by rotating or translating etc. Mode to close to and contact binding belt, so that binding belt is heated and melted, to realize sealing. The ironing head of traditional bundling machine realizes sealing band, and the heating element used by outer hot ironing head is usually cut from 1mm-3mm thick high temperature alloy metal plate, directly as ironing head main part, when current passes, metal plate generates heat, and heat is transferred to the surface of ironing head. This kind of ironing head controls the heating capacity of ironing head by adjusting duty cycle to control the power-on time and power-off time of electric heating element, but in high-speed sealing band process, often appear the situation of large temperature difference range, for example, from the highest value 500 degrees to 450 degrees, temperature fluctuation range error is as high as dozens of degrees, leading to the temperature used for every packing and sealing band is not uniform value, which may lead to poor sealing band effect, such as incomplete fusion or excessive burning.

[0003] In the prior art, the utility model with patent no. CN202020725307.9 named a kind of novel ironing head and the bundling machine with the structure thereof discloses an inner heating ironing head structure, it includes metal shell, insulating sheet and heating element, at least two insulating sheets are provided in metal shell, and heating element is provided between the insulating sheets;Heating element sets up two groups of parallel electric heating wires, and electric heating wire is connected with power supply connecting line and thermocouple for detecting temperature.

[0004] In the patent, the insulating sheet is attached inside the metal shell, and the heating element is directly attached between the two insulating sheets, so in the heat conduction process of the electric heating element, the heat needs to pass through the thickness of the insulating sheet and the metal shell itself, and the heat conduction speed is slow and the conduction time is long. UTILITY MODEL CONTENTS

[0005] To solve the problem of slow heat conduction response speed and long conduction time of the existing inner heating ironing head, the utility model provides an inner heating ironing head of bundling machine, which helps to improve the heat conduction speed.

[0006] To achieve the above-mentioned purpose, the following technical solutions are provided:

[0007] An inner heating ironing head of bundling machine, comprising an ironing head shell, a cover plate, a heating element and a temperature measuring element, the top surface of the ironing head shell is provided with an opening, and the cover plate is connected with the ironing head shell in the opening through a connecting piece;The inner bottom surface of the ironing head shell is provided with a first recess matching the shape of the heating element, and the heating element is placed in the first recess;A second recess for placing the temperature measuring element is also provided on the side of the first recess.

[0008] Furthermore, inward-facing buckles are provided on both sides of the opening, and the cover plate is secured to the outer shell of the heating head by the buckles.

[0009] Furthermore, the outer shell of the heating head is provided with slots on both sides, and the cover plate is provided with locking strips on both sides that cooperate with the slots.

[0010] Furthermore, on the inner bottom surface of the heating head shell, on the side away from the working end of the heating head shell, there is a wire groove communicating with the first groove, which is used to place the power cord connected to the heating element.

[0011] Furthermore, the outer shell of the heating head and the cover plate are provided with corresponding connection holes, and the outer shell of the heating head and the cover plate are connected at the connection holes by a connector.

[0012] Furthermore, the heating element is a ceramic heating element or an electric heating wire.

[0013] The beneficial effects of this utility model are as follows: This solution embeds the heating element inside the heating head shell, and by setting a groove, the shell thickness is reduced, which helps to improve the heat conduction speed; the temperature measuring element is also embedded in the groove inside the heating head shell, which has the characteristics of high temperature detection accuracy, fast feedback speed and high sensitivity, ensuring the sealing quality of the strapping and the firmness of the packaging. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an internal heating head for a strapping machine according to the present invention;

[0015] Figure 2 for Figure 1 A schematic diagram of the exploded structure;

[0016] Figure 3 This is a schematic diagram of another structure of the internal heating head of the strapping machine according to the present invention;

[0017] Figure 4 This is a detailed structural diagram of the heating element shell in this utility model;

[0018] In the diagram: 1. Iron head shell; 2. Cover plate; 3. Heating element; 4. Temperature measuring element; 5. First groove; 6. Second groove; 7. Buckle; 8. Slot; 9. Clip; 10. Wire groove; 11. Connecting hole; 12. Connector; 13. Iron head bracket. Detailed Implementation

[0019] The following detailed description of an internal heating head for a strapping machine, in conjunction with specific embodiments, illustrates this utility model.

[0020] The hot type sealing head in a bundling machine comprises a sealing head shell 1, a cover plate 2, a heating element 3 and a temperature measuring element 4. The top surface of the sealing head shell 1 is provided with an opening, and the cover plate 2 is connected with the sealing head shell 1 in the opening through a connecting piece 12. The inner bottom surface of the sealing head shell 1 is provided with a first recess 5 matching the shape of the heating element 3, and the heating element 3 is placed in the first recess 5. A second recess 6 for placing the temperature measuring element 4 is further provided at the side of the first recess 5.

[0021] In the embodiment, the temperature measuring element 4 is a temperature sensor. The temperature measuring element 4 is embedded in the recess inside the sealing head shell 1, and has the characteristics of high temperature detection precision, fast feedback speed and high sensitivity. The heating element 3 and the temperature measuring element 4 are connected to a control circuit through a line. After receiving the electric signal feedback by the temperature sensor, the temperature signal acquisition unit in the control circuit converts the electric signal into a digital signal and transmits it to a calculation processing unit. The calculation processing unit compares and calculates the set temperature value and the real-time temperature value according to the PID control algorithm, calculates the appropriate output parameters, and the switching circuit unit in the control circuit adjusts the closing and conduction time ratio in the switching cycle according to the parameters output by the calculation processing unit, so as to control the power output to the heating element. When the sealing head temperature is lower than the set temperature, the conduction time is increased and the heating power is increased to make the sealing head temperature rise. When the sealing head temperature is higher than the set temperature, the conduction time is reduced and the heating power is reduced to make the sealing head temperature drop, so as to finally realize the constant temperature control of the sealing head. The constant temperature sealing head can accurately control the temperature. In the bundling tape sealing process, stable temperature can ensure the quality of the bundling tape. For example, for polypropylene (PP) packaging tape, appropriate sealing temperature can make the molecular chain of the packaging tape fully fused at the sealing position. If the temperature fluctuation is too large, it may cause the sealing to be not firm and appear as a virtual welding. The constant temperature sealing head can effectively avoid this situation, so that the quality of each sealing can be kept consistent, thereby ensuring the firmness of the package.

[0022] Generally speaking, when the head is working at too high a temperature, the performance of its material will quickly decrease. For example, for a metal head, high temperature will accelerate the thermal fatigue of the metal, causing cracks on the surface of the head, excessive oxidation or overheating of the head due to too high a temperature, and other damages. Through the cooperation of the temperature measuring element 4 and the control circuit, the head can be prevented from working at an inappropriate temperature range by precise temperature control, reducing thermal damage and thus prolonging the service life of the head and reducing the maintenance cost and replacement frequency of the equipment. The constant-temperature head does not need to be preheated and wait for the temperature to stabilize as frequently as a non-constant-temperature head, and it can enter the working state more quickly. For example, in a continuous packaging operation, when the next packaging and sealing is needed, the constant-temperature head can quickly reach the set temperature and perform high-quality sealing. Moreover, because its temperature is stable, it will not need to be resealed due to an inappropriate temperature, reducing the number of interruptions during the work process and thus effectively improving the overall efficiency of the packaging work. Different packaging tape materials, such as PP packaging tape and PET packaging tape, have different melting points and sealing requirements. The constant-temperature head can be adjusted to the set temperature to meet the sealing requirements of different materials.

[0023] In this embodiment, the head shell 1 is provided with a clamping groove 8 on both sides, and the cover plate 2 is provided with a clamping strip 9 on both sides matched with the clamping groove 8. The clamping strip 9 is clamped into the clamping groove 8 of the head shell 1, thereby limiting the left and right positions of the cover plate 2, and then the cover plate 2 is connected with the head shell 1 through the connecting piece 12. In other embodiments, the edges of the opening are provided with inward buckles 7, and the cover plate 2 is clamped into the buckles 7 by pressing to be connected with the head shell 1.

[0024] Preferably, a wire groove 10 is arranged on the inner bottom surface of the head shell 1, away from the working end of the head shell 1, and is in communication with the first recess 5, for placing a power cord connected with the heating element 3.

[0025] Preferably, the head shell 1 and the cover plate 2 are provided with connecting holes 11 at corresponding positions, and the head shell 1 and the cover plate 2 are connected through the connecting piece 12 at the connecting holes 11, so as to fix the heating element 3 and the temperature measuring element 4 inside the head shell 1. After the connection is completed, silicone grease or silicone can be used for packaging. In this embodiment, the connecting piece 12 is a bolt, and the bolt can also be used to install the head shell 1 on the baling machine head support 13.

[0026] In this embodiment, the heating element 3 is a ceramic heating sheet. The ceramic heating sheet is an electronic device that uses the electrical conductivity and thermal conductivity of ceramic materials to achieve a heating effect, and has the characteristics of high insulation resistance, stable resistance value, fast heating speed, high thermal efficiency, and uniform heating. In other embodiments, the heating element 3 can also be an electric heating wire, which is wound into a flat shape and placed inside the first recess 5.

Claims

1. A hot type sealing head in a strapping machine, characterized by The iron head shell (1) is provided with an opening on the top surface, the cover plate (2) is connected with the iron head shell (1) in the opening through the connecting piece (12); the inner bottom surface of the iron head shell (1) is provided with a first recess (5) matched with the shape of the heating element (3), and the heating element (3) is placed in the first recess (5); a second recess (6) for placing the temperature measuring element (4) is further arranged on the side of the first recess (5).

2. An in-line hot tither as defined in claim 1 wherein, The two side edges of the opening are provided with inward buckles (7), and the cover plate (2) is clamped on the iron head shell (1) through the buckles (7).

3. An in-line hot tither as defined in claim 1 wherein, The two sides of the iron head shell (1) are provided with clamping grooves (8), and the two sides of the cover plate (2) are provided with clamping strips (9) matched with the clamping grooves (8).

4. In-heat sealer according to any one of claims 1 to 3, characterized in that, On the inner bottom surface of the iron head shell (1), the side away from the working end of the iron head shell (1) is provided with a wire groove (10) communicated with the first recess (5) for placing the power cord connected with the heating element (3).

5. An in-line hot tither as claimed in any one of claims 1 to 3, wherein, The iron head shell (1) and the cover plate (2) are connected through the connecting piece (12) at the connecting hole (11) on the corresponding positions.

6. An in-line hot tither as defined in claim 4 wherein, The iron head shell (1) and the cover plate (2) are connected through the connecting piece (12) at the connecting hole (11) on the corresponding positions.

7. An in-line hot tither as defined in claim 1, 2, 3 or 6 wherein, The heating element (3) is a ceramic heating sheet or an electric heating wire.

8. An in-line hot tither as defined in claim 4 wherein, The heating element (3) is a ceramic heating sheet or an electric heating wire.

9. An in-line hot tither as defined in claim 5 wherein, The heating element (3) is a ceramic heating sheet or an electric heating wire.

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