A heat sealing machine for processing seat cover bags and a working method thereof

Abstract

The application discloses a heat sealing machine for seat cover bag processing, which comprises a base, a vertical driving mechanism, a heat sealing cutter frame and a heat sealing cutter set. The top surface of the base is a workbench for placing seat cover bags that need to be heat sealed. The vertical driving mechanism is arranged on the top surface of the base and is connected to the heat sealing cutter frame through a vertically downward working end. The bottom of the heat sealing cutter frame is fixed with the heat sealing cutter set. The heat sealing cutter set is horizontally arranged and can be translated downward to be pressed on the workbench. The heat sealing cutter set comprises a hot knife and a heating belt. The hot knife is made of a flat steel band which is bent into a C-shaped arc and is consistent with a set arc-shaped heat sealing line. The heating belt is attached to one side of the hot knife and heats the hot knife. The application further discloses a working method of the heat sealing machine for seat cover bag processing. The application can complete the arc-shaped heat sealing line in one time, saves manpower and improves the processing quality.

Description

Technical Field

[0001] This invention relates to the field of automotive seat cover processing technology, and in particular to a heat sealing machine for processing seat covers and its working method. Background Technology

[0002] To ensure hygiene for test drive passengers, disposable plastic bags are often placed over the seats in new cars for sale. Auto repair shops also use these disposable seat covers for protection during vehicle maintenance. Figure 1 As shown, an existing seat cover bag 9 is displayed. To better adapt to the shape of the seat top, the top sealing line of the plastic film bag is an arc-shaped heat seal line 901, which is a large convex arc-shaped heat seal line. However, existing equipment, whether it is a highly automated bag making machine production line or a manual heat sealing machine, has a straight heat sealing blade, which can only produce a straight heat seal line.

[0003] Because the demand for these seat covers is not very large, and they are large and have a unique shape, factories currently often use manual heat sealing with hand tools. A template is created to mimic the shape, with perforations on it that match the curved heat sealing line 901. The template is then placed on the plastic film to be heat-sealed and positioned. A small hand-held heat-sealing tool is then used to manually heat-seal the plastic film bag along the perforations on the template, bit by bit. While this method meets the bag-making requirements, it suffers from high labor costs, and the quality of the heat seal heavily depends on the worker's skill level.

[0004] To overcome the above problems, a heat sealing machine for processing seat covers and its working method are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a heat sealing machine and its working method for processing seat covers, which can complete the arc-shaped heat sealing line in one go, saving manpower and improving the processing quality.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention discloses a heat-sealing machine for processing seat covers, comprising a base, a vertical drive mechanism, a heat-sealing knife holder, and a heat-sealing knife assembly. The top surface of the base serves as a worktable for placing seat covers to be heat-sealed. The vertical drive mechanism is mounted on the top surface of the base, with its vertically downward working end connected to the heat-sealing knife holder. The bottom of the heat-sealing knife holder is fixed to the heat-sealing knife assembly, which is horizontally positioned and capable of sliding downwards to press against the worktable. The heat-sealing knife assembly includes a hot-stick blade and a heating band. The hot-stick blade is made of flat steel strip bent into a C-arc shape, consistent with a predetermined arc-shaped heat-sealing line. The heating band is attached to one side of the hot-stick blade and heats it.

[0008] Furthermore, the heat-sealing knife assembly also includes a back steel strip, connecting plates, and a clamping screw. The back steel strip is a flat steel strip that runs the same length as the heat-sealing knife and is stacked on the outer wall of the heating band. Multiple connecting plates are fixedly connected to the top surface of the heat-sealing knife at equal intervals. The connecting plates are L-shaped and have threaded holes on the upright plates on the outer side of the heat-sealing knife. The clamping screw is threaded into the threaded holes and its inner end is pressed against the outer wall of the back steel strip. The connecting plates have mounting holes on the flat plate portion inside the heat-sealing knife, and bolts connected to the bottom surface of the heat-sealing knife holder are installed in the mounting holes.

[0009] Furthermore, a heat insulation pad is stacked between the back steel strip and the heating strip, and the working bottom edge of the hot knife protrudes along the entire length of the back steel strip, the heating strip and the heat insulation pad.

[0010] Furthermore, the base of the hot knife is provided with a heat insulation groove, which is an arc groove, and the two heat insulation grooves on both sides are staggered. The heating band is disposed between the heat insulation groove and the working bottom edge of the hot knife.

[0011] Furthermore, the heat-sealing knife holder is an I-shaped steel pipe frame, and the two ends of the crossbeam are provided with screw mounting holes for connecting the vertical drive mechanism. The crossbeam is also provided with threaded holes corresponding to the mounting holes.

[0012] Furthermore, the longitudinal beam of the heat-sealing knife holder is a nested beam comprising a middle sleeve and a middle insert tube, the middle insert tube being guided and slidably inserted into the middle sleeve; a locking screw is provided on the outer wall of the middle sleeve, the inner end of the locking screw being pressed against the outer wall of the middle insert tube; the number of threaded holes at the same installation position is multiple and they are spaced apart along the direction of the change in the specifications of the arc-shaped heat-sealing line.

[0013] Furthermore, the vertical drive mechanism includes columns, guide sleeves, linear drive units, top crossbeams, and support screws. The four columns are vertically arranged at the four corners of the workbench. The tops of two adjacent columns are connected by a horizontally arranged top plate. The linear drive unit is vertically installed in the middle of the top plate, and its protruding working end is connected to the longitudinal beam plate. The two ends of the longitudinal beam plate are slidably guided to the columns by the guide sleeves. The two top crossbeams are arranged in parallel and their two ends are fixedly connected to the longitudinal beam plates. The four support screws are vertically arranged, with the top end of each support screw connected to the top crossbeam plate and the bottom end connected to the screw mounting hole.

[0014] Furthermore, it also includes a blown film assembly, which includes a guide hole block, a guide rod, a bottom mounting block, a pressure roller, and an air nozzle. The guide hole block is installed at the upper middle position of the front part of the heat sealing knife holder. The cantilever end of the guide hole block is guided and connected to the guide rod through a vertical guide hole. The bottom of the guide rod is connected to the bottom mounting block. The guide rod is axially pre-positioned in the vertical guide hole by a compression spring and a top locking nut. The pressure roller is installed at the bottom end of the bottom mounting block. The air nozzle can deliver dry and clean compressed air to flatten the seat cover film that needs to be heat sealed.

[0015] The present invention also discloses a working method of a heat sealing machine for processing seat covers. The heat sealing machine for processing seat covers according to claim 8 is used to process the arc-shaped heat sealing line of the seat cover. The vertical drive mechanism drives the heat sealing knife group to press out the entire arc-shaped heat sealing line in one reciprocating stroke.

[0016] Furthermore, this includes the following steps:

[0017] Step 1: Material preparation. The film material has been divided into multiple equal-length plastic film cylindrical sections and stacked together. The heat sealing knife group is reset to the highest position. A person holds a section of plastic film in their hand and places it on the worktable. Both hands grasp the middle of the two sides of the plastic film section and pull it taut to the front edge of the worktable.

[0018] Step 2: Lay the film flat. Using the buttons on the control panel, the vertical drive mechanism drives the heat sealing knife assembly to move downwards to the middle position. At this time, the pressure roller is connected to the plastic film, and the air nozzle sprays out a fan-shaped diffused airflow to flatten the end of the plastic film that needs to be heat sealed.

[0019] Step 3: Heat sealing. Using the buttons on the control panel, the vertical drive mechanism drives the heat sealing knife group to continue moving downwards to the lowest position. At this time, the hot knife presses against the plastic film for heat sealing. After the set time is reached, the vertical drive mechanism drives the heat sealing knife group to automatically return to the middle position.

[0020] Step 4: Cooling. The jet nozzle sprays a fan-shaped diffused airflow to cool and shape the completed arc-shaped heat-sealed line. After the set time is reached, the airflow is stopped, and the vertical drive mechanism drives the heat-sealing knife group to automatically return to the highest position. The seat cover is then manually removed to prepare for the next work.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0022] This invention relates to a heat-sealing machine for processing seat covers. It utilizes a hot-pressing blade formed by bending a single flat steel strip, providing strong conformability and enabling the creation of perfectly compliant arc-shaped heat-sealing lines. Furthermore, the consistent height of the working bottom edge allows for simultaneous heat sealing, achieving complete forming in a single press. A heating band of equal length is attached to one side of the hot-pressing blade, ensuring continuous heating along its length and preventing uneven heating in certain areas. This heat-sealing machine for processing seat covers can complete the arc-shaped heat-sealing line in one operation, saving labor and improving processing efficiency and quality.

[0023] Furthermore, the installation of several connecting plates solves both the installation problems of the heat-sealing knife assembly and the heat-sealing knife holder, as well as the installation of the heating belt. The addition of a back steel strip significantly improves the back support of the heating belt, enhancing its fit with the heat-sealing knife and thus significantly improving heat utilization efficiency. The use of heat insulation pads and grooves reduces the heat loss path of the heating belt, ensuring efficient heating of the heat-sealing knife. The heat-sealing knife holder, constructed with an I-beam steel pipe frame, is simple and easy to implement, facilitating the installation of C-shaped heat-sealing knives. The nested arrangement of the central sleeve and central insert allows for adjustment of the spacing between the two crossbeams. Multiple threaded holes enable timely adjustment of the heat-sealing knife shape to adapt to changes in seat cover specifications, meeting the production needs of various seat cover sizes. Four vertical support screws connect the heat-sealing knife holder and the top crossbeam plate, providing support and leveling the heat-sealing knife holder, ensuring that the working bottom edge of the heat-sealing knife is on the same horizontal plane. By adding a blown film assembly, the plastic film can be smoothly laid out before heat sealing, reducing the workload of manual laying. Simultaneously, the surface of the plastic film can be cleaned during the blowing process, reducing the impact of dust. The pressure rollers allow for auxiliary positioning of the plastic film at the center of the front edge of the worktable, preventing inaccurate positioning caused by the film shifting backward during the blowing process.

[0024] The present invention relates to a heat-sealing machine for processing seat covers. Through three-position movement control—highest, middle, and lowest—it achieves the functions of air nozzle cleaning, plastic film laying, and cooling / shaping. Simultaneously, due to the height difference, the impact of air jetting on the heat-sealing blade assembly is minimal. The final cooling / shaping step allows for rapid cooling of the heat-sealed area along the curved heat-sealing line, preventing breakage at the curved heat-sealing line during manual unloading. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of an existing seat cover structure;

[0027] Figure 2This is a schematic diagram of the main structure of the heat sealing machine for processing seat covers according to the present invention;

[0028] Figure 3 This is a schematic diagram of the left side of the heat sealing machine for processing seat covers according to the present invention;

[0029] Figure 4 This is a bottom view schematic diagram of the heat sealing knife holder and heat sealing knife assembly of the present invention;

[0030] Figure 5 This is a cross-sectional view of the hot air knife assembly of the present invention at the installation position.

[0031] Explanation of reference numerals in the attached drawings: 1. Base; 2. Column; 201. Top plate; 3. Guide sleeve; 4. Linear drive unit; 5. Top crossbeam plate; 6. Support screw; 7. Heat sealing knife holder; 701. Middle sleeve; 702. Middle insert tube; 703. Threaded hole; 704. Screw mounting hole; 705. Locking set screw; 8. Heat sealing knife assembly; 801. Hot knife; 8011. Heat insulation groove; 802. Heating belt; 803. Heat insulation pad; 804. Back steel belt; 805. Connecting plate; 806. Pressing set screw; 807. Mounting hole; 9. Seat cover; 901. Arc-shaped heat sealing line; 10. Guide hole block; 11. Guide rod; 111. Screw section; 12. Bottom mounting block; 13. Pressure roller; 14. Pad layer; 15. Control panel; 16. Air nozzle. Detailed Implementation

[0032] The core of this invention is to provide a heat sealing machine for processing seat covers and its working method, which can complete the arc-shaped heat sealing line in one go, saving manpower and improving processing quality.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Refer to the attached diagram. Figure 1 A schematic diagram of an existing seat cover structure; Figure 2This is a schematic diagram of the main structure of the heat sealing machine for processing seat covers according to the present invention; Figure 3 This is a schematic diagram of the left side of the heat sealing machine for processing seat covers according to the present invention; Figure 4 This is a bottom view schematic diagram of the heat sealing knife holder and heat sealing knife assembly of the present invention; Figure 5 This is a cross-sectional view of the hot air knife assembly of the present invention at the installation position.

[0036] In one specific implementation, such as Figures 1-5 As shown, the heat-sealing machine for processing seat covers according to the present invention includes a base 1, a vertical drive mechanism, a heat-sealing knife holder 7, and a heat-sealing knife assembly 8. The top surface of the base 1 is a worktable for placing seat covers 9 to be heat-sealed. A pad 14 is laid on the horizontally arranged worktable, comprising a bottom layer of heat-insulating rubber sheet and a top layer of Teflon high-temperature cloth. The vertical drive mechanism is mounted on the top surface of the base 1, with its vertically downward working end connected to the heat-sealing knife holder 7. The bottom of the heat-sealing knife holder 7 is fixed to the heat-sealing knife assembly 8, which is horizontally arranged and can slide downwards to press against the worktable. The heat-sealing knife assembly 8 includes a hot-stripping blade 801 and a heating band 802. The hot-stripping blade 801 is made of flat steel strip bent into a C-arc shape, consistent with the predetermined arc-shaped heat-sealing line 901. The heating band 802 is attached to one side of the hot-stripping blade 801 and heats it. A temperature sensor is also installed on the heat-sealing knife holder 7 to monitor the temperature of the hot-stripping blade 801. An electrical control box is installed inside the base 1. The electrical control system inside the electrical control box controls the vertical drive mechanism, the heating belt 802 and the temperature sensor.

[0037] The heat-sealing knife 801, formed by bending a single flat steel strip, has strong conforming ability and can produce a perfectly compliant arc-shaped heat-sealing line 901. Furthermore, the working bottom edge has a consistent height, allowing for simultaneous heat sealing and forming in a single press. A heating band 802 of equal length is attached to one side of the heat-sealing knife 801, enabling heating along the entire length of the knife and preventing uneven heating. This invention's heat-sealing machine for processing seat covers can complete the arc-shaped heat-sealing line in one operation, saving manpower and improving processing efficiency and quality.

[0038] In one specific embodiment of the present invention, such as Figure 4 and Figure 5 As shown, note Figure 4 and Figure 5The views shown are bottom views and then sectional views, so the vertical positions are reversed compared to the actual views. The heat-sealing knife assembly 8 also includes a backing steel strip 804, connecting plates 805, and clamping screws 806. The backing steel strip 804 is a flat steel strip that runs the same length as the heat-sealing knife 801 and is stacked on the outer wall of the heating band 802. Multiple connecting plates 805 are fixedly connected to the top surface of the heat-sealing knife 801 at equal intervals. The connecting plates 805 are L-shaped and have threaded holes on the upright plates on the outer side of the heat-sealing knife 801. The clamping screws 806 are threaded into the threaded holes, and their inner ends are pressed against the outer wall of the backing steel strip 804. The connecting plates 805 have mounting holes 807 on the flat plate portion inside the heat-sealing knife 801. Bolts connected to the bottom surface of the heat-sealing knife holder 7 are installed in the mounting holes 807.

[0039] Specifically, such as Figure 4 and Figure 5 As shown, a heat insulation pad 803 is also stacked between the back steel strip 804 and the heating strip 802. The heat insulation pad 803 can be a rock wool pad or an asbestos pad. The working bottom edge of the hot knife 801 protrudes along its entire length from the back steel strip 804, the heating strip 802 and the heat insulation pad 803.

[0040] Furthermore, to prevent the working bottom edge of the hot knife 801 from sticking to the plastic film, the working bottom edge of the hot knife 801 is coated with a PTFE coating.

[0041] Specifically, such as Figure 5 As shown, the base of the hot knife 801 is provided with a heat insulation groove 8011. The heat insulation groove 8011 is an arc groove, and the two heat insulation grooves 8011 on both sides are staggered. The heating band 802 is provided between the heat insulation groove 8011 and the working bottom edge of the hot knife 801.

[0042] By setting up several connecting plates 805, the installation problems of the heat sealing knife assembly 8 and the heat sealing knife holder 7 can be solved, as well as the installation problem of the heating band 802. By adding a back steel strip 804, the back support of the heating band 802 can be better achieved, which significantly improves the fit between it and the hot knife 801 and significantly improves the heat utilization efficiency. By setting up the heat insulation pad 803 and the heat insulation groove 8011, the heat dissipation path of the heating band 802 can be reduced, ensuring that the hot knife 801 is heated efficiently.

[0043] In one specific embodiment of the present invention, such as Figure 4 As shown, the heat-sealing knife holder 7 is an I-beam steel pipe frame. Both ends of the crossbeam are provided with screw mounting holes 704 for connecting to the vertical drive mechanism. The length of the front crossbeam is slightly greater than that of the rear crossbeam, adapting to the shape of the hot knife 801. The crossbeam is also provided with threaded holes 703 corresponding to the mounting holes 807.

[0044] Specifically, such as Figure 4As shown, the longitudinal beam of the heat-sealing knife holder 7 is a nested beam, including a middle sleeve 701 and a middle insert tube 702. The middle insert tube 702 is guided and slidably inserted into the middle sleeve 701. A locking screw 705 is provided on the outer wall of the middle sleeve 701, and the inner end of the locking screw 705 is pressed against the outer wall of the middle insert tube 702. There are multiple threaded holes 703 at the same installation position, which are spaced apart along the direction of specification change of the arc-shaped heat-sealing line 901.

[0045] The heat-sealing knife holder 7, made of I-beam steel pipe frame, is simple to implement and easy to install the C-shaped hot knife 801. The nested arrangement of the middle sleeve 701 and the middle insert 702 allows for adjustment of the spacing between the two crossbeams. It is also equipped with multiple threaded holes 703, which can be used to adjust the shape of the hot knife 801 for adaptive assembly after the specifications of the seat cover 9 change, thus meeting the production needs of seat cover 9 of various specifications.

[0046] In one specific embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the vertical drive mechanism includes columns 2, guide sleeves 3, linear drive units 4, top crossbeam plates 5, and support screws 6. Four columns 2 are vertically positioned at the four corners of the workbench. The tops of two adjacent columns 2 are connected by a horizontally positioned top plate 201. The linear drive unit 4 is vertically installed in the middle of the top plate 201. There are two linear drive units 4, which operate synchronously. The protruding working ends of the linear drive units 4 are connected to the longitudinal beam plate, and both ends of the longitudinal beam plate are slidably guided onto the columns 2 by the guide sleeves 3. Two top crossbeam plates 5 are arranged parallel to each other and fixedly connected to the longitudinal beam plates at both ends. Four support screws 6 are vertically positioned, with the top ends of the support screws 6 connected to the top crossbeam plates 5 and the bottom ends connected to screw mounting holes 704.

[0047] Obviously, the vertical drive mechanism can also be in the form of a single gantry frame, requiring only a linear drive unit to be placed in the middle of the gantry frame beam. Similar simple variations all fall within the scope of protection of this invention.

[0048] Specifically, the linear drive unit 4 can be a double-stroke cylinder, a hydraulic cylinder, or an electric actuator. The connection between the support screw 6 and the mounting hole 704 is secured by two lock nuts, one above the other.

[0049] By connecting the heat-sealing knife holder 7 and the top crossbeam plate 5 with four vertical support screws 6, the heat-sealing knife holder 7 can be leveled while providing support, thereby ensuring that the working bottom edge of the hot knife 801 is on the same horizontal plane.

[0050] In one specific embodiment of the present invention, such as Figure 1 and Figure 2As shown, the heat-sealing machine for processing seat covers of the present invention also includes a blown film assembly, which includes a guide hole block 10, a guide rod 11, a bottom mounting block 12, a pressure roller 13, and an air nozzle 16. The guide hole block 10 is installed at the upper middle position of the front part of the heat-sealing knife holder 7. The cantilever end of the guide hole block 10 is guided and connected to the guide rod 11 through a vertical guide hole. The bottom of the guide rod 11 is connected to the bottom mounting block 12. The guide rod 11 is axially pre-positioned in the vertical guide hole by a compression spring and a top locking nut. The two ends of the compression spring abut against the bottom surface of the guide hole block 10 and the top surface of the bottom mounting block 12, respectively. The top section of the guide rod 11 is a screw section 111, which is connected to the locking nut for axial locking and limiting. The pressure roller 13 is installed at the bottom end of the bottom mounting block 12. In order to facilitate the acquisition of the descent position of the pressure roller 13, a displacement switch is installed on the side wall of the bottom mounting block 12. The displacement switch transmits the intermediate position signal to the electrical control system. The nozzle 16 delivers dry, clean compressed air to flatten the film of the seat cover 9 that requires heat sealing. The back connector of the nozzle 16 connects to the air valve assembly and the air source via an air tube, the air valve assembly being controlled by the equipment's electrical control system.

[0051] Obviously, the nozzle 16 can be in the form of a flat duckbill or multiple nozzle outlets arranged in a fan shape. This allows the dry, clean compressed airflow to be directed towards the flat plastic film material.

[0052] By adding a blown film assembly, the plastic film can be smoothly laid out before heat sealing, reducing the workload of manual laying. Simultaneously, the surface of the plastic film can be cleaned during the blowing process, reducing the impact of dust. The pressure roller 13 provides auxiliary positioning of the plastic film at the center of the front edge of the worktable, preventing inaccurate positioning caused by the film shifting backward during the blowing process.

[0053] This invention relates to a heat-sealing machine for processing seat covers. It utilizes a hot-pressing blade 801, formed by bending a single flat steel strip. This blade has strong conformability, capable of producing perfectly compliant arc-shaped heat-sealing lines 901. Furthermore, the working bottom edge height is consistent, allowing for simultaneous heat sealing in a single press. A heating band 802 of equal length is attached to one side of the hot-pressing blade 801, enabling continuous heating along its entire length and preventing uneven heating. This heat-sealing machine for processing seat covers can complete the arc-shaped heat-sealing line in one operation, saving manpower and improving processing efficiency and quality. Furthermore, the installation of several connecting plates 805 solves both the installation problems of the heat-sealing knife assembly 8 and the heat-sealing knife holder 7, as well as the installation problem of the heating band 802. The addition of a back steel strip 804 significantly improves the back support of the heating band 802, resulting in a better fit with the hot knife 801 and significantly improved heat utilization efficiency. The use of heat insulation pads 803 and heat insulation grooves 8011 reduces the heat dissipation path of the heating band 802, ensuring efficient heating of the hot knife 801. The heat-sealing knife holder 7, using an I-shaped steel pipe frame, has a simple and easy-to-implement structure, facilitating the installation of the C-shaped hot knife 801. The nested arrangement of the middle sleeve 701 and the middle insert 702 allows for adjustment of the spacing between the two crossbeams. Multiple threaded holes 703 enable timely adjustment of the shape of the hot knife 801 for adaptive assembly after changes in the specifications of the seat cover 9, meeting the production needs of various specifications of seat cover 9. By connecting the heat-sealing knife holder 7 and the top crossbeam plate 5 with four vertical support screws 6, the heat-sealing knife holder 7 can be leveled while providing support, ensuring that the working bottom edge of the heat-sealing knife 801 is on the same horizontal plane. The addition of a film blowing assembly allows for smooth laying of the plastic film before heat sealing, reducing manual laying workload. Simultaneously, the surface of the plastic film can be cleaned during the blowing process, reducing the impact of dust. The pressure roller 13 provides auxiliary positioning of the plastic film at the center of the front edge of the worktable, preventing inaccurate positioning caused by the film moving backward during the blowing process.

[0054] The present invention also provides a working method for a heat sealing machine for processing seat covers. The heat sealing machine for processing seat covers with the above-mentioned blown film assembly is used to process the arc-shaped heat sealing line 901 of the seat cover 9. The vertical drive mechanism drives the heat sealing knife group 8 to press out the entire arc-shaped heat sealing line 901 in one reciprocating stroke.

[0055] In one specific embodiment of the present invention, the working method of the heat sealing machine for processing seat covers includes the following steps:

[0056] Step 1: Material Preparation. The film material has been divided into multiple equal-length cylindrical segments of plastic film and stacked together. Each cylindrical segment corresponds to one seat cover bag 9. The heat-sealing knife assembly 8 is reset to its highest position. The operator holds a segment of plastic film onto the worktable, grasping the middle of both sides of the segment with both hands. This middle position is estimated based on the front-to-back length of the worktable. The film is then pulled taut to the front edge of the worktable. At this point, the portion of the plastic film to be heat-sealed can be loosely placed on the worktable; it does not need to be flattened.

[0057] Step 2: Lay the film flat. Using the button on the control panel 15, the vertical drive mechanism drives the heat sealing knife group 8 to move downwards to the middle position. At this time, the pressure roller 13 is connected to the plastic film. After the electronic control system collects the signal from the displacement switch, it stops the vertical drive mechanism, the valve group opens, and the jet nozzle 16 sprays out a fan-shaped diffused airflow to flatten the end of the plastic film that needs to be heat sealed.

[0058] Step 3: Heat sealing. Using the buttons on the control panel 15, the vertical drive mechanism drives the heat sealing knife group 8 to continue moving downwards to the lowest position. At this time, the hot knife 801 presses against the plastic film for heat sealing. After the set time of 2 to 5 seconds, the vertical drive mechanism drives the heat sealing knife group 8 to automatically return to the middle position.

[0059] Step four: Cooling. The valve group reopens, and the jet nozzle 16 sprays a fan-shaped diffused airflow to cool and shape the completed arc-shaped heat-sealed line 901. The airflow stops after the set time of 3 seconds. The vertical drive mechanism drives the heat-sealing knife group 8 to automatically return to the highest position, and the seat cover 9 is manually removed to prepare for the next work, and the cycle repeats.

[0060] By controlling the movement amplitude of the three stations—highest, middle, and lowest—the air nozzle 16 can perform the functions of cleaning, laying out the plastic film, and cooling and shaping. Simultaneously, due to the height difference, the impact of air jetting on the heat-sealing knife assembly 8 is minimal. The final cooling and shaping step allows for rapid cooling of the heat-sealing area of ​​the curved heat-sealing line 901, preventing breakage at the curved heat-sealing line 901 during manual material handling.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A heat-sealing machine for processing seat covers, characterized in that, The utility model provides a heat sealing cutter group, including base (1), vertical drive mechanism, heat sealing cutter frame (7) and heat sealing cutter group (8), the top surface of base (1) is the workbench of placing the seat cover bag (9) needing heat sealing, vertical drive mechanism is erected on the top surface of base (1) vertical downward work end is connected heat sealing cutter frame (7), heat sealing cutter frame (7) bottom fixed heat sealing cutter group (8), heat sealing cutter group (8) horizontal arrangement and can be downwardly translated and press together on the workbench, heat sealing cutter group (8) including ironing knife (801) and heating band (802), ironing knife (801) adopts flat steel band bending into C arc shape and is consistent with the set arc heat sealing line (901), heating band (802) is attached on one side of ironing knife (801) and is heated for it, heat sealing cutter group (8) still includes back steel band (804), connecting plate piece (805) and compression top wire (806), back steel band (804) is the flat steel strip of with ironing knife (801) length and is stacked on the outer side wall of heating band (802), a plurality of connecting plate piece (805) equidistant interval fixed connection is established on the top surface of ironing knife (801), connecting plate piece (805) is L board shape and is set with threaded hole on the vertical board of ironing knife (801) outer side, compression top wire (806) is screwed with threaded hole and inner end head is compressed on the outer side wall of back steel band (804), the flat plate portion of connecting plate piece (805) is set with mounting hole (807) on the inner side of ironing knife (801), the bolt of mounting hole (807) is mounted to the bottom surface of heat sealing cutter frame (7) and is connected, back steel band (804) and heating band (802) between still stack a layer of heat insulation pad (803), the working bottom of ironing knife (801) is protruding from back steel band (804), heating band (802) and heat insulation pad (803) along length, the root of ironing knife (801) is provided with heat insulation groove (8011), heat insulation groove (8011) is circular arc groove, and the two heat insulation grooves (8011) on both sides are staggered, and the heating band (802) is arranged between the heat insulation groove (8011) and the working bottom of the ironing knife (801). The heat sealing cutter frame (7) is an I-shaped steel pipe frame, screw rod mounting holes (704) connected to the vertical drive mechanism are arranged at both ends of the cross beam, and threaded holes (703) corresponding to the mounting holes (807) are further arranged on the cross beam. The vertical beam of the heat sealing cutter frame (7) is a nested beam including a middle sleeve pipe (701) and a middle insertion pipe (702), the middle insertion pipe (702) is slidably inserted into the middle sleeve pipe (701), a lock top wire (705) is arranged on the outer wall of the middle sleeve pipe (701), the inner end of the lock top wire (705) is tightly pressed against the outer wall of the middle insertion pipe (702), and the number of the threaded holes (703) at the same installation position is multiple and is arranged at intervals along the specification change direction of the arc heat sealing line (901). ​ It also includes a film blowing assembly, the film blowing assembly includes a guide hole block (10), a guide rod (11), a bottom mounting block (12), a pressure wheel (13) and a jet nozzle (16), the guide hole block (10) is installed above the front of the heat sealing knife holder (7) in the middle position, the cantilever end of the guide hole block (10) is connected with the guide rod (11) through the vertical guide hole, the bottom of the guide rod (11) is connected with the bottom mounting block (12); the guide rod (11) is axially positioned in the vertical guide hole through the compression spring and the top lock nut shaft; the pressure wheel (13) is installed at the bottom end of the bottom mounting block (12), and the jet nozzle (16) can guide out dry and clean compressed air to flatten the seat cover bag (9) film which needs to be heat sealed.

2. The seat bag processing heat sealer according to claim 1, characterized by: The vertical drive mechanism includes a column (2), a guide sleeve (3), a linear drive unit (4), a top cross beam plate (5) and a support screw (6), four columns (2) are vertically arranged at four corner positions of the workbench, the top of the two adjacent columns (2) in front and back is connected through a horizontally arranged top plate (201), the linear drive unit (4) is vertically installed at the middle position of the top plate (201), the linear drive unit (4) is connected to the longitudinal beam plate towards the protruding working end, and the longitudinal beam plate is slidably guided on the column (2) through the guide sleeve (3); two top cross beam plates (5) are arranged in parallel and fixedly connected at both ends of the longitudinal beam plate, four support screws (6) are vertically arranged, the top end of the support screw (6) is connected with the top cross beam plate (5) and the bottom end is connected with the screw mounting hole (704).

3. A method of operating a heat sealer for bagging seat covers, the method comprising: The seat cover bag (9) is processed by the heat sealing machine for seat cover bag processing in claim 1, and one reciprocating stroke of the vertical drive mechanism drives the heat sealing knife group (8) to press out the entire arc-shaped heat sealing line (901).

4. The method of claim 3, wherein: The method comprises the following steps: Step one, material preparation, the film material is divided into multiple equal-length plastic film cylinder segments which are stacked together, the heat sealing knife group (8) is reset to the highest working position, a segment of plastic film is manually held on the workbench, and both hands respectively hold the middle positions of the two side edges of the segment of plastic film and are pulled tight to the front edge of the workbench; Step two, flattening the film, the vertical drive mechanism drives the heat sealing knife group (8) to move down to the middle working position through the buttons on the control panel (15), at this time, the pressure wheel (13) is connected to the plastic film, and the jet nozzle (16) sprays a fan-shaped air flow to flatten the end of the plastic film which needs to be heat sealed; Step three, heat sealing, the vertical drive mechanism drives the heat sealing knife group (8) to continue to move down to the lowest working position through the buttons on the control panel (15), at this time, the ironing knife (801) is pressed on the plastic film to perform ironing, and after reaching the set time, the vertical drive mechanism drives the heat sealing knife group (8) to automatically reset to the middle working position; Step four, cooling, jet nozzle (16) jet fan-shaped scattering air flow to cool the completed arc-shaped heat seal line (901) shaping, stop air after the set time, the vertical drive mechanism drives the heat seal knife group (8) to automatically reset to the highest position, manually remove the seat cover bag (9), ready for the next work.

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