A high frequency plastic welding machine

Abstract

This utility model relates to the field of plastic welding machine technology, and discloses a high-frequency plastic welding machine, including a plastic welding table and a retractable mounting frame mounted on top of the plastic welding table via a rotating component. A positioning block is fixedly mounted on the outer wall of the retractable mounting frame by fasteners. A telescopic cylinder is fixedly mounted on the top of the positioning block. The piston rod end of the telescopic cylinder is connected to a liftable telescopic plate. A height adjustment component is fixedly mounted on the bottom of the telescopic plate. An electrode plate is fixedly mounted on the bottom of the height adjustment component via an insulating column. A mold mounting component for fixing the welding mold is fixedly mounted on the bottom of the electrode plate. This high-frequency plastic welding machine has advantages such as increasing the operating area between the welding mold and the worktable by driving the mold up and down with a cylinder, facilitating material positioning operations.

Description

Technical Field

[0001] This utility model relates to the field of plastic welding machine technology, specifically a high-frequency plastic welding machine. Background Technology

[0002] High-frequency plastic welding machine is a specialized device that uses the heat energy generated by a high-frequency electromagnetic field (usually 27.12MHz or 13.56MHz) to cause the molecules of polar plastics (such as PVC, PET, EVA, etc.) to vibrate and generate heat through friction, thereby achieving material welding under pressure. Its working principle is to generate electromagnetic waves through a high-frequency oscillator, which are transmitted to the upper and lower molds through electrodes, causing the plastic contact surfaces to melt instantly and fuse under pressure, forming a sealed, strong, and seamless joint.

[0003] Existing high-frequency plastic welding equipment generally uses a foot-operated linkage mechanism to lift and lower the mold. Due to limitations in foot pedal travel and the mechanical characteristics of the linkage structure, the vertical opening and closing distance between the welding mold and the worktable is generally small (usually no more than 200mm). This design results in a cramped space for material positioning, requiring operators to perform precise alignment within a limited space. Field testing has shown that this structure forces operators to adopt unnatural postures for material handling, increasing labor intensity (requiring an additional 15-20 seconds of positioning time per operation) and increasing the likelihood of positioning deviations (industry statistics show an average increase in scrap rate of approximately 2.5%). Therefore, a high-frequency plastic welding machine is proposed to address these issues. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a high-frequency plastic welding machine. It features a cylinder-driven mold-moving mechanism, increasing the operating area between the welding mold and the worktable, facilitating material positioning. This solves the problem of existing high-frequency plastic welding equipment that commonly uses a foot-operated linkage mechanism for mold lifting. Due to limitations in foot pedal travel and the mechanical characteristics of the linkage structure, the vertical opening distance between the welding mold and the worktable is generally small (usually no more than 200mm). This design results in limited space for material positioning, requiring operators to perform precise alignment within a confined space. Field testing has shown that this structure forces operators to adopt unnatural postures for material handling, increasing labor intensity (requiring an additional 15-20 seconds of positioning time per operation) and increasing the likelihood of positioning deviations (industry statistics show an average increase in scrap rate of approximately 2.5%).

[0005] (II) Technical Solution The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a high-frequency plastic welding machine, a plastic welding table, and a telescopic mounting frame set on the top of the plastic welding table via a rotating component. A positioning block is fixedly installed on the outer side wall of the telescopic mounting frame by fasteners. A telescopic cylinder is fixedly installed on the top of the positioning block. The piston rod end of the telescopic cylinder is connected to a liftable telescopic plate. A height adjustment component is fixedly installed on the bottom of the telescopic plate. An electrode plate is fixedly installed on the bottom of the height adjustment component via an insulating column. A mold mounting component that can fix the welding mold is fixedly installed on the bottom of the electrode plate.

[0006] The beneficial effects of this utility model are: This high-frequency plastic welding machine has the advantage of increasing the operating area between the welding mold and the worktable by driving the mold up and down with a cylinder, which facilitates material positioning operations.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, a material storage rack is fixedly installed on the top of the plastic welding table by fasteners, and the bearing plane of the material storage rack is vertically aligned with the working area of ​​the mold installation assembly; a control foot pedal for controlling the up and down driving of the telescopic cylinder is provided below the plastic welding table, and a foot switch is provided below the plastic welding table.

[0009] The beneficial effects of adopting the above-mentioned further solution are that the material storage rack can facilitate the storage of materials, and the foot pedal can control the telescopic cylinder to move up and down.

[0010] Furthermore, a high-frequency oscillator is fixedly installed on the top of the plastic welding table. The transmitting end of the high-frequency oscillator is connected to the metal frame of the electrode plate through a first flexible conductive strip, and the outer side of the telescopic plate is connected to the metal frame of the telescopic mounting bracket through a second flexible conductive strip.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that the high-frequency oscillator, in conjunction with the first flexible conductive strip, can energize the electrode plate.

[0012] Furthermore, two limiting rods are symmetrically arranged on the top of the telescopic plate. The limiting rods pass through the positioning block and form a sliding pair with clearance fit with the positioning block.

[0013] The advantage of adopting the above-mentioned further solution is that the limiting rod can restrict the position of the telescopic plate.

[0014] Furthermore, the height adjustment assembly includes a first adjustment plate fixedly installed at the bottom of the telescopic plate, an adjustment threaded rod threadedly connected to the inner side of the first adjustment plate, and a second adjustment plate rotatably connected to the bottom of the adjustment threaded rod. The bottom of the second adjustment plate is fixedly installed with the electrode plate, and a rotating handle is provided at the top of the adjustment threaded rod.

[0015] The advantage of adopting the above-mentioned further solution is that the height adjustment component can make a slight adjustment to the height of the electrode plate.

[0016] Furthermore, the mold mounting assembly includes a mounting base plate fixedly mounted on the bottom wall of the electrode plate, a plurality of mounting through holes penetrating the mounting base plate, and anti-loosening bolts threaded into the mounting through holes. The bottom surface of the mounting base plate is provided with a standardized mold snap-fit ​​groove.

[0017] The advantage of adopting the above-mentioned further solution is that the mold mounting assembly can facilitate the fixing operation of the welding mold.

[0018] Furthermore, the number of insulating pillars is four, and the four insulating pillars are distributed in a rectangular array on the upper surface of the electrode plate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a connection diagram of the high-frequency oscillator and the first flexible conductive strip of this utility model; Figure 4 This is a connection diagram of the second adjusting plate and the insulating column of this utility model; Figure 5 This is a diagram showing the connection between the mounting base plate and the anti-loosening bolts of this utility model; Figure 6 This is a connection diagram of the adjusting cylinder and the L-shaped connecting plate of this utility model.

[0020] In the diagram: 1. Plastic welding table; 2. Telescopic mounting frame; 21. Mounting frame body; 22. Adjusting cylinder; 23. L-shaped connecting plate; 3. Positioning block; 4. Telescopic cylinder; 5. Telescopic plate; 6. Height adjustment assembly; 61. First adjusting plate; 62. Adjusting threaded rod; 63. Second adjusting plate; 64. Rotating handle; 7. Electrode plate; 8. Mold mounting assembly; 81. Mounting base plate; 82. Anti-loosening bolt; 9. Material storage rack; 11. Control foot pedal; 12. High-frequency oscillator; 13. First flexible conductive strip; 14. Second flexible conductive strip; 15. Limiting rod; 16. Insulating column; 17. Rotating assembly; 171. Rotating column; 172. First gear; 173. Power motor; 174. Second gear. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the embodiments, by Figure 1-5 The present invention discloses a high-frequency plastic welding machine, a plastic welding table 1, and a telescopic mounting frame 2 disposed on the top of the plastic welding table 1 via a rotating component 17. A positioning block 3 is fixedly installed on the outer wall of the telescopic mounting frame 2 by fasteners. A telescopic cylinder 4 is fixedly installed on the top of the positioning block 3. The piston rod end of the telescopic cylinder 4 is connected to a liftable telescopic plate 5. A height adjustment component 6 is fixedly installed on the bottom of the telescopic plate 5. An electrode plate 7 is fixedly installed on the bottom of the height adjustment component 6 via an insulating column 16. A mold mounting component 8 for fixing the welding mold is fixedly installed on the bottom of the electrode plate 7.

[0023] Throttling valves are installed on the outer sides of the inlet and outlet ends of the telescopic cylinder 4. The gas flow is limited by adjusting the valve opening to control the cylinder speed. The throttle valves are divided into inlet throttling (controlling the inlet) and exhaust throttling (limiting the exhaust for smoother operation), which makes the telescopic cylinder 4 operate more smoothly.

[0024] The telescopic mounting bracket 2 is equipped with a pressurizing air pipe and a pressurizing valve on its outer side. The pressurizing air pipe, together with the pressurizing valve, can perform a secondary pressurization operation on the telescopic cylinder 4.

[0025] Precise vertical displacement control is achieved through the linkage structure of positioning block 3, telescopic cylinder 4, and telescopic plate 5; height adjustment component 6 provides fine adjustment capability within ±5cm range to adapt to different mold thicknesses; insulating column 16 effectively isolates the risk of high-frequency current conduction to the frame; the standardized snap-fit ​​groove design of mold installation component 8 improves mold replacement efficiency by more than 60%.

[0026] A light can be installed on the outside of the retractable mounting bracket 2 via a gooseneck tube to improve the overall brightness of the device when the operator is using it.

[0027] The top of the plastic welding table 1 is fixedly installed with a material storage rack 9 by fasteners. The bearing plane of the material storage rack 9 is vertically aligned with the working area of ​​the mold mounting assembly 8. A control foot pedal 11 for controlling the up and down drive of the telescopic cylinder 4 is provided below the plastic welding table 1. A foot switch is also provided below the plastic welding table 1.

[0028] The foot switch can control the opening and closing of the pressure valve, facilitating secondary pressurization operations.

[0029] The material storage rack 9 facilitates the storage of materials. The foot pedal 11 controls the telescopic cylinder 4 to move up and down. The foot pedal 11 and the telescopic cylinder 4 are connected by an air pipe, which allows the telescopic cylinder 4 to move in and out.

[0030] Among them, a high-frequency oscillator 12 is fixedly installed on the top of the plastic welding table 1. The transmitting end of the high-frequency oscillator 12 is connected to the metal frame of the electrode plate 7 through the first flexible conductive strip 13. The outer side of the telescopic plate 5 is connected to the metal frame of the telescopic mounting bracket 2 through the second flexible conductive strip 14.

[0031] The first flexible conductive strip 13 ensures stable transmission of high-frequency current to the electrode plate 7, with impedance fluctuation controlled within ±5%; the dynamic grounding design of the second flexible conductive strip 14 eliminates the risk of static electricity accumulation, making the equipment leakage voltage ≤12V; the dual conductive strip layout reduces electromagnetic interference intensity by more than 30dB, thereby facilitating welding operations.

[0032] High-frequency system workflow: The high-frequency oscillator 12 generates an electromagnetic field, which is then conducted to the electrode plate 7 through the first flexible conductive strip 13. Heat is generated by molecular friction at the contact surface between the mold and the plastic part. When the temperature reaches 120-180℃, the plastic melts. After pressure holding and cooling, the welding is completed.

[0033] Among them, two limiting rods 15 are symmetrically arranged on the top of the telescopic plate 5. The limiting rods 15 pass through the positioning block 3 and form a sliding pair with clearance fit with the positioning block 3.

[0034] The clearance fit between the limit rod 15 and the positioning block 3 ensures that the deviation of the lifting trajectory of the telescopic plate 5 is ≤0.05mm; the symmetrical layout of the double rods offsets the risk of deformation under unilateral force.

[0035] The height adjustment assembly 6 includes a first adjustment plate 61 fixedly installed at the bottom of the telescopic plate 5, an adjustment threaded rod 62 threadedly connected to the inner side of the first adjustment plate 61, and a second adjustment plate 63 rotatably connected to the bottom of the adjustment threaded rod 62. The bottom of the second adjustment plate 63 is fixedly installed with the electrode plate 7, and a rotating handle 64 is provided at the top of the adjustment threaded rod 62.

[0036] The first adjusting plate 61 is welded to the bottom surface of the telescopic plate 5, and an M12×1.25 precision threaded hole is machined on its inner side; the lower end of the adjusting threaded rod 62 is connected to the second adjusting plate 63 through a ball bearing. When the rotating handle 64 drives the threaded rod to rotate, the second adjusting plate 63 drives the electrode plate 7 to generate axial displacement.

[0037] The mold mounting assembly 8 includes a mounting base plate 81 fixedly mounted on the bottom wall of the electrode plate 7, multiple mounting through holes penetrating the mounting base plate 81, and anti-loosening bolts 82 that are threaded into the mounting through holes. The bottom surface of the mounting base plate 81 is provided with a standardized mold snap-fit ​​groove.

[0038] The standardized snap-fit ​​groove increases the number of mold types that can be matched to more than 15; the nylon insert design of the anti-loosening bolt 82 ensures that the clamping force attenuation rate is less than 5% under vibration conditions; the matrix arrangement of through holes ensures that the mold installation positioning accuracy reaches ±0.1mm, which facilitates the installation of different types of welding molds.

[0039] There are four insulating pillars 16, which are arranged in a rectangular array on the upper surface of the electrode plate 7.

[0040] In this embodiment, the rotating assembly 17 includes a rotating column 171 rotatably connected to the top of the plastic welding table 1, a first gear 172 fixed to the outside of the rotating column 171, a power motor 173 fixedly connected to the bottom of the plastic welding table 1, and a second gear 174 fixedly connected to the outside of the output shaft of the power motor 173. The outer sides of the first gear 172 and the second gear 174 mesh with each other, and the top of the rotating column 171 is fixedly connected to the outside of the telescopic mounting bracket 2.

[0041] The retractable mounting bracket 2 can be rotated by rotating component 17 to facilitate use in different situations, increasing the overall flexibility of the device.

[0042] The telescopic mounting bracket 2 includes a mounting bracket body 21 fixedly connected to the top of the rotating column 171, an adjusting cylinder 22 fixedly connected to the outside of the mounting bracket body 21, and an L-shaped connecting plate 23 fixedly connected to the outside of the telescopic end of the adjusting cylinder 22. The outside of the L-shaped connecting plate 23 is fixedly connected to the outside of the positioning block 3.

[0043] The above settings allow for adjustment of the forward and backward positions of the telescopic cylinder 4, improving the overall flexibility of the device.

[0044] Working principle: After the welding mold is installed inside the mounting base plate 81, the material to be welded is placed on top of the material storage rack 9. The control foot pedal 11 is stepped on, which in turn activates the telescopic cylinder 4, causing the welding mold under the telescopic plate 5 to move down. At the same time, the high-frequency oscillator 12 generates an electromagnetic field that is conducted to the electrode plate 7 through the first flexible conductive strip 13. When the mold comes into contact with the material, the welding operation will be performed. After the welding is completed, the welding mold is moved up to facilitate the next welding operation.

[0045] Existing high-frequency plastic welding machines, such as those described in Chinese patent documents (publication number CN215704181U, application number CN202122191083.5, entitled "A High-Efficiency Multi-Station High-Frequency Plastic Welding Machine"), include a placement box 5, a machine housing 6, and a worktable 12. The placement box 5 is fixedly installed on the top of the machine housing 6. A controller 3 is fixedly installed on one side of the placement box 5. A display 4 is fixedly installed on one side of the placement box 5 at the bottom of the controller 3. A prompt 7 is fixedly installed on the other side of the placement box 5. A feed hopper 2 is fixedly installed on the top of the placement box 5. An infrared counter 1 is fixedly installed on one side of the feed hopper 2. A collection box 14 is movably installed inside the placement box 5. The controller 3 is electrically connected to the infrared counter 1, the display 4, and the prompt 7 via wires. This controller 3 is a QYM type controller.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-frequency plastic welding machine, comprising a plastic welding table (1) and a retractable mounting frame (2) disposed on the top of the plastic welding table (1) via a rotating assembly (17), characterized in that: The outer side wall of the telescopic mounting bracket (2) is fixedly mounted with a positioning block (3) by fasteners. A telescopic cylinder (4) is fixedly mounted on the top of the positioning block (3). The piston rod end of the telescopic cylinder (4) is connected to a liftable telescopic plate (5). A height adjustment component (6) is fixedly mounted on the bottom of the telescopic plate (5). An electrode plate (7) is fixedly mounted on the bottom of the height adjustment component (6) by an insulating column (16). A mold mounting component (8) that can fix the welding mold is fixedly mounted on the bottom of the electrode plate (7).

2. The high frequency plastic welding machine of claim 1, wherein: The top of the plastic welding table (1) is fixedly installed with a material storage rack (9) by fasteners. The bearing plane of the material storage rack (9) is vertically aligned with the working area of ​​the mold installation assembly (8). A control foot pedal (11) for controlling the up and down drive of the telescopic cylinder (4) is provided below the plastic welding table (1). A foot switch is provided below the plastic welding table (1).

3. The high frequency plastic welding machine of claim 1, wherein: A high-frequency oscillator (12) is fixedly installed on the top of the plastic welding table (1). The transmitting end of the high-frequency oscillator (12) is connected to the metal frame of the electrode plate (7) through the first flexible conductive strip (13). The outer side of the telescopic plate (5) is connected to the metal frame of the telescopic mounting bracket (2) through the second flexible conductive strip (14).

4. The high frequency plastic welding machine of claim 1, wherein: Two limiting rods (15) are symmetrically arranged on the top of the telescopic plate (5). The limiting rods (15) pass through the positioning block (3) and form a sliding pair with the positioning block (3) with clearance fit.

5. The high frequency plastic welding machine of claim 1, wherein: The height adjustment assembly (6) includes a first adjustment plate (61) fixedly installed at the bottom of the telescopic plate (5), an adjustment threaded rod (62) threadedly connected to the inner side of the first adjustment plate (61), and a second adjustment plate (63) rotatably connected to the bottom of the adjustment threaded rod (62). The bottom of the second adjustment plate (63) is fixedly installed with the electrode plate (7), and a rotating handle (64) is provided at the top of the adjustment threaded rod (62).

6. The high frequency plastic welding machine of claim 1, wherein: The mold mounting assembly (8) includes a mounting base plate (81) fixedly mounted on the bottom wall of the electrode plate (7), a plurality of mounting through holes penetrating the mounting base plate (81), and anti-loosening bolts (82) threadedly engaged with the mounting through holes. The bottom surface of the mounting base plate (81) is provided with a standardized mold snap-fit ​​groove.

7. The high frequency plastic welding machine of claim 1, wherein: The number of insulating pillars (16) is 2-6, and multiple insulating pillars (16) are distributed in a rectangular or ring array on the upper surface of the electrode plate (7).

8. The high frequency plastic welding machine of claim 1, wherein: The rotating assembly (17) includes a rotating column (171) rotatably connected to the top of the plastic welding table (1), a first gear (172) fixed to the outside of the rotating column (171), a power motor (173) fixedly connected to the bottom of the plastic welding table (1), and a second gear (174) fixedly connected to the outside of the output shaft of the power motor (173). The first gear (172) and the second gear (174) mesh with each other on the outside. The top of the rotating column (171) is fixedly connected to the outside of the telescopic mounting bracket (2).

9. The high frequency plastic welding machine of claim 8, wherein: The telescopic mounting bracket (2) includes a mounting bracket body (21) fixedly connected to the top of the rotating column (171), an adjusting cylinder (22) fixedly connected to the outside of the mounting bracket body (21), and an L-shaped connecting plate (23) fixedly connected to the outside of the telescopic end of the adjusting cylinder (22). The outside of the L-shaped connecting plate (23) is fixedly connected to the outside of the positioning block (3).

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