Ultrasonic welding machine with anti-pinch structure

Abstract

The utility model discloses an ultrasonic welding machine with an anti-pinch structure, which relates to the technical field of ultrasonic welding and comprises a base, a support is fixedly mounted on the base, an electric push rod is mounted on the support, an ultrasonic transducer is fixedly mounted at the output tail end of the electric push rod, an amplitude-change pole is connected onto the ultrasonic transducer, and the amplitude-change pole is connected with the anti-pinch structure. A mold assembly is installed between the amplitude-change pole and the base and comprises an upper mold fixedly installed on the amplitude-change pole and a lower mold fixedly installed on the base, a grating switch is installed between the upper mold and the lower mold and connected to a power line of the electric push rod, and a limiting mechanism is installed in the lower mold. A positioning groove is formed in the middle of the lower die, and an inlet-outlet is formed in the edge of the positioning groove. According to the ultrasonic welding machine with the anti-pinch structure, the mold assembly can prevent hand pinching accidents from occurring, the limiting mechanism can prevent a workpiece from moving in the welding process, and the welding precision is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic welding technology, specifically an ultrasonic welding machine with an anti-pinch structure. Background Technology

[0002] Ultrasonic welding is a highly efficient and clean solid-state joining technology that uses high-frequency mechanical vibration to generate heat through friction between the molecules of plastic or metal contact surfaces, causing them to fuse instantly under pressure. Two hemispherical plastic parts are typically welded into a spherical shape using an ultrasonic welding machine.

[0003] In the prior art, patent announcement number CN222819570U discloses an ultrasonic welding machine, including a base. The bottom of the base is equipped with a wire groove. The front side of the base is respectively embedded with a two-hand start button and an emergency stop button. A bracket is installed on the base, and a lifting cylinder is installed on the top of the bracket. A fine-tuning shim is installed on the front side of the bracket by hexagonal bolts, and a linear guide is installed on the fine-tuning shim. A lifting fixing seat is installed on the slider of the linear guide, and the top of the lifting fixing seat is connected to the output end of the lifting cylinder. A transducer fixing plate is installed at the bottom of the lifting fixing seat, and a horizontal adjustment flange is installed at the bottom of the transducer fixing plate by hexagonal bolts. An ultrasonic transducer is installed on the horizontal adjustment flange, and an amplitude transformer is installed at the bottom of the ultrasonic transducer. An ultrasonic mold is installed at the bottom of the amplitude transformer.

[0004] The aforementioned device uses an amplitude transformer to drive the mold to vibrate at high frequency, causing the plastic to generate heat through friction and fuse instantly under pressure. However, no protective measures are provided on the mold, making it very easy for operators' hands to be pinched during the mold's downward movement. Furthermore, the mold's movement may cause slight displacement of the workpiece inside, which directly affects the welding accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide an ultrasonic welding machine with an anti-pinch structure to solve the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an ultrasonic welding machine with an anti-pinch structure, comprising a base, a bracket fixedly mounted on the base, an electric push rod mounted on the bracket, an ultrasonic transducer fixedly mounted at the output end of the electric push rod, an amplitude transformer connected to the ultrasonic transducer, a mold assembly installed between the amplitude transformer and the base, the mold assembly comprising an upper mold fixedly mounted on the amplitude transformer and a lower mold fixedly mounted on the base, a grating switch installed between the upper mold and the lower mold, and the grating switch connected to the power line of the electric push rod, and a limit mechanism installed inside the lower mold.

[0007] Preferably, a positioning groove is provided in the middle of the lower mold, and an inlet and outlet are provided at the edge of the positioning groove, and a spherical workpiece is placed on the lower mold.

[0008] Preferably, the bottom of the lower mold is provided with bolts, and the lower mold is fixedly installed on the base by bolts.

[0009] Preferably, the upper mold has a docking hole, the upper mold is connected to the lower end of the amplitude transformer through the docking hole, the upper mold is installed above the lower mold through the amplitude transformer, and the upper mold and the lower mold are vertically aligned.

[0010] Preferably, the limiting mechanism includes a retainer and a positioning sleeve fixedly installed in the lower mold. A return spring is provided in the positioning sleeve, and a telescopic rod is slidably installed in the positioning sleeve. A lifting arm is fixedly installed at the lower end of the telescopic rod. A rack and a limiting strip are fixedly installed on the lifting arm. A rotary switch is fixedly installed on the retainer and is connected to the power line of the ultrasonic transducer. A gear is fixedly installed on the input end of the rotary switch and meshes with the rack.

[0011] Preferably, the positioning sleeve has a through hole at its bottom, through which the telescopic rod extends out of the positioning sleeve.

[0012] Preferably, one end of the return spring is connected to the telescopic rod, and the other end of the return spring is connected to the top of the positioning sleeve. The limiting strip extends out of the lower mold through the inlet and outlet, and the limiting strip is connected to the lower end of the telescopic rod through the lifting arm.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this application, after the spherical workpiece is precisely positioned and placed in the positioning groove, the operator can release their hands. At this time, due to the absence of obstructions, the grating switch is activated, which triggers the power supply to the electric push rod, causing the upper mold to move downwards and achieve mold closure. After closure, the ultrasonic transducer and its amplitude transformer start, completing the welding process of the workpiece. If there are foreign objects between the upper and lower molds, the grating switch will be blocked, causing the closing circuit to be interrupted, thus preventing mold closure and effectively avoiding the risk of the mold pinching and injuring the operator's hands.

[0015] 2. In this application, the return spring can drive the extension of the limiting strip, which in turn restricts the movement of the workpiece to prevent positional displacement during welding, thereby ensuring welding accuracy. During mold closing, the upper mold applies pressure to the limiting strip, causing it to enter the lower mold and prompting the lifting arm to move downwards. The downward movement of the lifting arm drives the rack to move downwards, which in turn causes the gear to rotate. The rotation of the gear triggers the activation of the rotary switch, automatically turning on the power to the ultrasonic transducer after mold closing, thus facilitating the welding operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the mold assembly of this utility model;

[0019] Figure 4 This is a schematic diagram of the limiting mechanism of this utility model.

[0020] The following components are labeled in the diagram: 1. Base; 2. Bracket; 3. Electric push rod; 4. Ultrasonic transducer; 5. Amplitude bar; 6. Mold assembly; 601. Upper mold; 602. Spherical workpiece; 603. Lower mold; 604. Positioning groove; 605. Inlet / outlet; 606. Grating switch; 7. Limiting mechanism; 701. Cage; 702. Positioning sleeve; 703. Return spring; 704. Telescopic rod; 705. Limiting strip; 706. Lifting arm; 707. Rack; 708. Gear; 709. Rotary switch. 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] like Figure 1 and Figure 2As shown, this utility model provides a technical solution for an ultrasonic welding machine with an anti-pinch structure, including a base 1, a bracket 2 fixedly installed on the base 1, an electric push rod 3 installed on the bracket 2, an ultrasonic transducer 4 fixedly installed at the output end of the electric push rod 3, an amplitude transformer 5 connected to the ultrasonic transducer 4, a mold assembly 6 installed between the amplitude transformer 5 and the base 1, and a limiting mechanism 7 installed in the lower mold 603. The mold assembly 6 can prevent hand pinching accidents, and the limiting mechanism 7 can prevent the workpiece from shifting during the welding process, ensuring welding accuracy.

[0023] like Figure 2 and Figure 3 As shown, the mold assembly 6 includes an upper mold 601 fixedly installed on the amplitude rod 5 and a lower mold 603 fixedly installed on the base 1. A grating switch 606 is installed between the upper mold 601 and the lower mold 603, and the grating switch 606 is connected to the power line of the electric push rod 3. A positioning groove 604 is provided in the middle of the lower mold 603, and an inlet and outlet 605 are provided at the edge of the positioning groove 604. A spherical workpiece 602 is placed on the lower mold 603. Bolts are provided at the bottom of the lower mold 603, and the lower mold 603 is fixedly installed on the base 1 by bolts.

[0024] Specifically, once the spherical workpiece 602 is precisely placed inside the positioning groove 604, the operator can completely release their hands. Once the hands are removed, the grating switch 606 will no longer be obstructed and will be in an unobstructed open state. This change in state triggers a signal, which in turn connects the power to the electric push rod 3. After power is connected, the upper mold 601 begins to move downwards, performing the mold closing action. After the mold closing action is completed, the ultrasonic transducer 4 and the amplitude transformer 5 immediately begin to work, working together to weld the spherical workpiece 602 together. If any foreign object exists between the upper mold 601 and the lower mold 603, the grating switch 606 will detect it and immediately switch to the closed state. The closed grating switch 606 prevents the mold closing action from occurring, effectively avoiding the danger of the mold pinching and injuring the operator's hands.

[0025] like Figure 2 and Figure 4As shown, the limiting mechanism 7 includes a retainer 701 and a positioning sleeve 702 fixedly installed in the lower mold 603. A return spring 703 is provided in the positioning sleeve 702. A telescopic rod 704 is slidably installed in the positioning sleeve 702. A lifting arm 706 is fixedly installed at the lower end of the telescopic rod 704. A rack 707 and a limiting strip 705 are fixedly installed on the lifting arm 706. A rotary switch 709 is fixedly installed on the retainer 701 and is connected to the power line of the ultrasonic transducer 4. A gear 708 is fixedly installed on the input end of the rotary switch 709 and meshes with the rack 707. A through hole is opened at the bottom of the positioning sleeve 702, and the telescopic rod 704 extends out of the positioning sleeve 702 through the through hole.

[0026] Specifically, the return spring 703 pushes the limit bar 705 to extend, and the extended limit bar 705 effectively restricts the range of motion of the workpiece during the welding process. In this way, the limit bar 705 prevents unnecessary displacement of the workpiece. Furthermore, during mold closing, the upper mold 601 precisely presses the limit bar 705 into the lower mold 603, triggering a series of mechanical reactions. As the limit bar 705 is pressed in, the lifting arm 706 moves downward accordingly. The downward movement of the lifting arm 706 causes the rack 707 to move downward as well, and the downward movement of the rack 707 causes the gear 708 to begin rotating. The rotation of the gear 708 triggers the opening of the rotary switch 709. Once the rotary switch 709 is opened, it automatically connects the power supply to the ultrasonic transducer 4. This series of precise mechanical actions ensures the smooth progress of the welding operation, making the entire welding process both efficient and convenient.

[0027] Working principle: When in use, first place the spherical workpiece 602 in the positioning groove 604, then release your hands. After releasing your hands, the grating switch 606 is unobstructed and in the open state, thereby connecting the power supply of the electric push rod 3, causing the upper mold 601 to move downward and complete the mold closing. After the mold is closed, the ultrasonic transducer 4 and the amplitude transformer 5 work to weld the workpiece together. When there are foreign objects between the upper mold 601 and the lower mold 603, the grating switch 606 is in the closed state and the mold closing cannot be completed, preventing the mold from pinching and injuring the hands. Furthermore, the return spring 703 will pull the limit bar 705 to extend. The extended limit bar 705 can restrict the movement of the workpiece, prevent the workpiece from shifting during the welding process, and ensure welding accuracy. During the mold closing process, the upper mold 601 will press the limit bar 705 into the lower mold 603, thereby causing the lifting arm 706 to move downward. After the lifting arm 706 moves downward, it will drive the rack 707 to move downward. After the rack 707 moves downward, it will drive the gear 708 to rotate. After the gear 708 rotates, it will turn on the knob switch 709, thereby automatically connecting the power supply of the ultrasonic transducer 4 after the mold is closed, which facilitates the welding operation.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An ultrasonic welding machine with an anti-pinch structure, comprising a base (1), a bracket (2) fixedly mounted on the base (1), an electric push rod (3) mounted on the bracket (2), an ultrasonic transducer (4) fixedly mounted at the output end of the electric push rod (3), and an amplitude transformer (5) connected to the ultrasonic transducer (4), characterized in that: A mold assembly (6) is installed between the amplitude rod (5) and the base (1). The mold assembly (6) includes an upper mold (601) fixedly installed on the amplitude rod (5) and a lower mold (603) fixedly installed on the base (1). A grating switch (606) is installed between the upper mold (601) and the lower mold (603), and the grating switch (606) is connected to the power line of the electric push rod (3). A limit mechanism (7) is installed inside the lower mold (603).

2. An ultrasonic welding machine with an anti-pinch structure according to claim 1, characterized in that: The lower mold (603) has a positioning groove (604) in the middle, and an inlet and outlet (605) are provided at the edge of the positioning groove (604). A spherical workpiece (602) is placed on the lower mold (603).

3. An ultrasonic welding machine with an anti-pinch structure according to claim 2, characterized in that: The lower mold (603) is provided with bolts at the bottom, and the lower mold (603) is fixedly installed on the base (1) by bolts.

4. An ultrasonic welding machine with an anti-pinch structure according to claim 3, characterized in that: The upper mold (601) has a docking hole, and the upper mold (601) is connected to the lower end of the amplitude rod (5) through the docking hole. The upper mold (601) is installed above the lower mold (603) through the amplitude rod (5), and the upper mold (601) and the lower mold (603) are aligned vertically.

5. An ultrasonic welding machine with an anti-pinch structure according to claim 4, characterized in that: The limiting mechanism (7) includes a retainer (701) and a positioning sleeve (702) fixedly installed in the lower mold (603). The positioning sleeve (702) is provided with a return spring (703). A telescopic rod (704) is slidably installed in the positioning sleeve (702). A lifting arm (706) is fixedly installed at the lower end of the telescopic rod (704). A rack (707) and a limiting strip (705) are fixedly installed on the lifting arm (706). A rotary switch (709) is fixedly installed on the retainer (701). The rotary switch (709) is connected to the power line of the ultrasonic transducer (4). A gear (708) is fixedly installed on the input end of the rotary switch (709). The gear (708) meshes with the rack (707).

6. An ultrasonic welding machine with an anti-pinch structure according to claim 5, characterized in that: The positioning sleeve (702) has a through hole at the bottom, and the telescopic rod (704) extends out of the positioning sleeve (702) through the through hole.

7. An ultrasonic welding machine with an anti-pinch structure according to claim 6, characterized in that: One end of the reset spring (703) is connected to the telescopic rod (704), and the other end of the reset spring (703) is connected to the top of the positioning sleeve (702). The limiting strip (705) extends out of the lower mold (603) through the inlet and outlet (605), and the limiting strip (705) is connected to the lower end of the telescopic rod (704) through the lifting arm (706).

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