High-frequency induction welding machine

Abstract

The present invention relates to the technical field of welding machines. Disclosed is a high-frequency induction welding machine, comprising: a welding machine main body, a mounting base, an upper mold and a lower mold, wherein a coil is mounted on the lower mold, and a monitoring assembly, a welding protection assembly and an extrusion protection assembly are provided on the upper mold. In the present invention, by means of improving the upper mold and providing the monitoring assembly, the welding protection assembly and the extrusion protection assembly, when the monitoring assembly detects a position offset of an upper plastic member by means of an ejector pin, the welding protection assembly operates and controls the circuit of the coil to be in a disconnected state, such that the coil is prevented from heating a metal medium on a lower plastic member, and damage to the lower plastic member is thus avoided; moreover, after the extrusion protection assembly operates, the pressure of an upper-mold main body on the upper plastic member is reduced, such that the deformation of or damage to the upper plastic member caused by the upper-mold main body continuously pressing down on the upper plastic member with a relatively large pressure is prevented. In such a manner, the upper plastic member and the lower plastic member can both be protected, thereby reducing the probability of product damage, reducing economic losses, and achieving a higher safety.

Description

A high-frequency induction welding machine Technical Field

[0001] The present invention relates to the technical field of welding machines, in particular to a high-frequency induction welding machine. Background Art

[0002] The high-frequency induction welding machine uses a metal coil as the dielectric material and high-frequency induction heating technology based on the principle of electromagnetic induction to generate induction heating on the metal dielectric of the plastic product, and applies a certain pressure to make the working interface melt quickly, and then fill the interface gap to achieve the welding effect. During operation, the staff first places the metal dielectric at the connection between the two plastic parts, and then merges the plastic parts into the lower mold. When the welding machine is running, it drives the upper mold to move downward to fix and press the merged plastic parts. At the same time, the coil is energized to heat the metal dielectric. After the connection between the plastic parts melts and cools, the two plastic parts can be tightened, and finally the plastic parts can be taken out of the mold.

[0003] Existing high-frequency induction welding machines are often semi-automatic equipment, that is, the placement of the metal medium and the loading and unloading processes are all manual operations. During manual loading, improper operation may cause the upper and lower plastic parts to be offset. In many cases, the position offset is difficult to detect. At this time, if welding is performed directly, the offset upper plastic part will not be able to smoothly enter the mold cavity when the upper mold moves downward, causing the bottom of the upper mold to directly press down on the upper plastic part when it contacts it, resulting in the upper plastic part being squeezed and damaged. In addition, the metal medium heated by the coil after power is applied can only melt the lower plastic part, causing the lower plastic part to be scrapped. In this case, the product will be damaged and economic losses will also occur.

[0004] Currently, no effective solutions have been proposed for the problems in related technologies.

[0005] Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a high-frequency induction welding machine, which has the advantages of high safety and solves the problem that the welding operation of the welding machine may damage the plastic parts when the position of the plastic parts is offset.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a high-frequency induction welding machine, comprising a welding machine body, a mounting base, an upper mold and a lower mold, wherein the lower mold is provided with a coil, and the upper mold is provided with a monitoring component, a welding protection component and an extrusion protection component;

[0008] The upper mold comprises an upper mold body, and a mold cavity is provided at the bottom of the upper mold body;

[0009] The monitoring assembly is mounted on the upper mold and includes an ejector pin movably connected to the upper mold. The monitoring assembly is used to determine whether the position of the upper plastic part is offset.

[0010] The welding protection assembly is mounted on the upper mold and connected to the coil, and is used to control the circuit of the coil to be disconnected when the position of the upper plastic part is offset;

[0011] The extrusion protection assembly is installed on the upper mold, and the extrusion protection assembly is used to reduce the pressure of the upper mold on the upper plastic part when the position of the upper plastic part is offset;

[0012] When the welding machine body controls the upper mold to move downward, the upper plastic part pushes the ejector pin to move. When the ejector pin does not move to the specified position, it is determined that the position of the upper plastic part is offset, and the welding protection component disconnects the coil circuit. At the same time, the pressure of the downward-moving upper mold on the upper plastic part is reduced.

[0013] Preferably, the upper mold also includes a base plate, which is fixed to the bottom of the mounting seat by adjusting bolts, and an insertion rod is fixed to the top of the upper mold body, and the insertion rod passes through the base plate and is movably connected to the base plate. A first spring is disposed on the outer sleeve of the insertion rod, and the bottom end of the first spring is fixed to the upper mold body, and the top end of the first spring is fixed to the base plate.

[0014] Preferably, a slot is provided in the top wall of the mold cavity, the ejector pin is arranged in the slot, the top end of the ejector pin is movably connected to the upper mold body and the base plate, the bottom end of the ejector pin extends to the bottom of the mold cavity, a stopper is fixed in the middle of the ejector pin, a second spring is mounted on the outer sleeve of the ejector pin, the top end of the second spring is fixed to the inner wall of the slot, and the bottom end of the second spring is fixed to the stopper.

[0015] Preferably, the welding protection assembly includes a first wiring copper plate and a second wiring copper plate, the first wiring copper plate and the second wiring copper plate are symmetrically distributed on both sides of the ejector and are both fixed to the upper mold body, a first wire is fixed on the first wiring copper plate, the first wire is connected to the coil at one end away from the first wiring copper plate, the coil is connected to the welding machine body at one end away from the first wire, a second wire is fixed on the second wiring copper plate, and the second wire is connected to the welding machine body.

[0016] Preferably, a conductive copper block is provided in the middle of the ejector pin, and the conductive copper block passes through the ejector pin and is fixedly connected to the ejector pin.

[0017] Preferably, the extrusion protection assembly includes a collar, which is fixed on the top of the base plate, and is located between the insertion rod and the ejector pin. A pin is movably inserted in the collar, and a block is fixed to the pin near one end of the insertion rod. A third spring is disposed on the outer sleeve of the pin, and both ends of the third spring are respectively fixed to the block and the collar. A slot is provided on the side wall of the insertion rod, and the block engages with the slot.

[0018] Preferably, the end of the latch close to the ejector pin is fixedly connected to a first magnetic block, and the middle of the ejector pin is fixed to a second magnetic block.

[0019] Preferably, a pressure sensor is provided at the connection between the first spring and the base plate, and an alarm is fixed on the welding machine body.

[0020] Preferably, a guide rod is fixedly connected to the top of the upper mold body, and the guide rod is movably plugged into the base plate.

[0021] Compared with the prior art, the present invention provides a high-frequency induction welding machine with the following beneficial effects:

[0022] 1. This high-frequency induction welding machine improves the upper mold and is equipped with a monitoring component, a welding protection component and an extrusion protection component. When the monitoring component detects the position deviation of the upper plastic part through the ejector pin, the welding protection component is activated and the circuit of the control coil is in a disconnected state, thereby preventing the coil from heating the metal medium on the lower plastic part, thereby preventing the lower plastic part from being damaged after the metal medium is heated. At the same time, after the extrusion protection component is activated, the pressure of the upper mold body on the upper plastic part is reduced, preventing the upper mold body from continuously pressing down on the upper plastic part with a large pressure, causing deformation or damage to the upper plastic part. In this way, it is beneficial to protect the upper and lower plastic parts at the same time, greatly reducing the probability of product damage, reducing economic losses, and being safer.

[0023] 2. This high-frequency induction welding machine monitors the position deviation of the upper plastic part through the ejector pin. It has a simple structure, low cost and accurate monitoring. By setting the first spring, the second spring and the third spring, it is helpful to reset the upper mold body, the ejector pin and the latch respectively, which is conducive to reuse, is not easy to damage, has a long service life and is easy to maintain.

[0024] 3. This high-frequency induction welding machine is equipped with a pressure sensor and an alarm, which is conducive to controlling the operation of the alarm when the position of the upper plastic part is offset, and conveniently prompting the operator to adjust the position of the upper plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of the three-dimensional structure of a high-frequency induction welding machine of the present invention;

[0026] FIG2 is a schematic structural diagram of the lower mold of the present invention;

[0027] FIG3 is an enlarged view of portion A of FIG2 of the present invention;

[0028] FIG4 is an enlarged view of portion B of FIG2 of the present invention;

[0029] FIG5 is a schematic structural diagram of an upper mold of the present invention;

[0030] FIG6 is an enlarged view of portion C of FIG5 of the present invention;

[0031] FIG7 is a schematic structural diagram of an extrusion protection assembly according to the present invention;

[0032] FIG8 is an enlarged view of portion D of FIG7 of the present invention;

[0033] FIG9 is an enlarged view of portion E of FIG7 of the present invention;

[0034] FIG10 is a schematic diagram of the operation of the welding protection assembly of the present invention;

[0035] FIG11 is an enlarged view of portion F of FIG10 of the present invention;

[0036] FIG12 is a schematic diagram of the operation of the extrusion protection assembly of the present invention;

[0037] FIG13 is an enlarged view of the G portion of FIG12 of the present invention.

[0038] In the figure: 1. Welding machine body; 2. Mounting base; 3. Upper mold; 31. Upper mold body; 32. Mold cavity; 33. Base plate; 34. Adjusting bolt; 35. Insert rod; 351. Card slot; 36. First spring; 37. Slot; 4. Lower mold; 5. Coil; 6. Monitoring assembly; 61. Ejector pin; 62. Block; 63. Second spring; 7. Welding protection assembly; 71. First connecting copper sheet; 72. Second connecting copper sheet; 73. First wire; 74. Second wire; 75. Conductive copper block; 8. Extrusion protection assembly; 81. Ring; 82. Pin; 83. Block; 84. Third spring; 85. First magnetic block; 86. Second magnetic block; 9. Pressure sensor; 10. Alarm; 11. Guide rod. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] As introduced in the background technology, there are deficiencies in the existing technology. In order to solve the above technical problems, this application proposes a high-frequency induction welding machine.

[0041] Referring to Figures 1-6, a high-frequency induction welding machine includes a welding machine body 1, a mounting base 2, an upper mold 3, and a lower mold 4. The lower mold 4 is mounted with a coil 5, and the upper mold 3 is provided with a monitoring component 6, a welding protection component 7, and an extrusion protection component 8.

[0042] The upper mold 3 includes an upper mold body 31, and a mold cavity 32 is provided at the bottom of the upper mold body 31;

[0043] The monitoring assembly 6 is mounted on the upper mold 3 and includes an ejector pin 61 movably connected to the upper mold 3. The monitoring assembly 6 is used to determine whether the position of the upper plastic part is offset.

[0044] The welding protection assembly 7 is mounted on the upper mold 3 and connected to the coil 5. The welding protection assembly 7 is used to control the circuit of the coil 5 to be disconnected when the position of the upper plastic part is offset;

[0045] The extrusion protection component 8 is installed on the upper mold 3, and the extrusion protection component 8 is used to reduce the pressure of the upper mold 3 on the upper plastic part when the position of the upper plastic part is offset;

[0046] When the welding machine body 1 controls the upper mold 3 to move downward, the upper plastic part pushes the ejector pin 61 to move. When the ejector pin 61 does not move to the specified position, it is determined that the position of the upper plastic part is offset, and the welding protection component 7 disconnects the circuit of the coil 5. At the same time, the pressure of the upper mold 3 on the upper plastic part is reduced.

[0047] Among them, the structure of the mounting base 2 and the welding machine body 1 is the same as that of the prior art. During welding work, the welding machine body 1 drives the mounting base 2 to move vertically through the built-in cylinder. The coil 5 is partially fixedly embedded in the lower mold 4 and just surrounds the connection of the plastic parts. When welding, the ejector pin 61 is just located at the top of the upper plastic part. The monitoring component 6 determines the standard of position deviation of the upper plastic part through the ejector pin 61 as follows: when the position of the upper plastic part is accurate, the mold cavity 32 of the lower mold 4 corresponds to the position of the upper plastic part. When the lower mold 4 moves downward, the upper plastic part can just move into the mold cavity 32; when the position of the upper plastic part is offset, the upper plastic part cannot move into the mold cavity 32, but contacts and abuts against each other with the lower mold 4; at this time, the relative displacement between the lower mold 4 and the upper plastic part changes, and the displacement amount of the ejector pin 61 after contacting the upper plastic part is different. When the displacement amount of the ejector pin 61 after contacting the upper plastic part is insufficient, it means that the upper plastic part has not moved into the mold cavity 32 of the upper mold 3, that is, the position of the upper plastic part is offset;

[0048] When in use, the upper plastic part and the lower plastic part are first combined and placed in the lower mold 4, the welding machine body 1 controls the mounting seat 2 to move downward, and then drives the upper mold 3 to move downward. When the upper mold 3 moves downward, it will drive the ejector pin 61 to move downward. If the position of the upper plastic part is not offset, the ejector pin 61 will first contact the upper plastic part and cannot move further, and the upper mold body 31 will continue to move downward. Therefore, the upper mold body 31 and the ejector pin 61 produce relative displacement until the upper plastic part enters the mold cavity 32 and finally contacts the inner wall of the mold cavity 32, the upper mold body 31 stops moving and presses the upper plastic part; if the position of the upper plastic part is offset, the upper plastic part cannot move into the film cavity, and when the bottom of the upper mold body 31 contacts the upper plastic part, it cannot move downward smoothly, and the relative displacement between the upper mold body 31 and the ejector pin 61 is reduced. At this time, the welding protection component 7 is operated, so that the coil 5 of the lower mold 4 is in a circuit-breaking state, and welding work cannot be performed, avoiding invalid welding, and the operation of the welding protection component 7 reduces the pressure of the upper mold body 31 on the upper plastic part to prevent damage to the upper plastic part;

[0049] By improving the upper mold 3 and setting up a monitoring component 6, a welding protection component 7 and an extrusion protection component 8, when the monitoring component 6 detects the position deviation of the upper plastic part through the ejector pin 61, the welding protection component 7 is activated and controls the circuit of the coil 5 to be in an off state, thereby preventing the coil 5 from heating the metal medium on the lower plastic part, thereby preventing the metal medium from damaging the lower plastic part after heating. At the same time, after the extrusion protection component 8 is activated, the pressure of the upper mold body 31 on the upper plastic part is reduced, preventing the upper mold body 31 from continuously pressing down the upper plastic part with a large pressure to cause deformation or damage to the upper plastic part. In this way, it is beneficial to protect the upper and lower plastic parts, greatly reducing the probability of product damage, reducing economic losses, and being safer.

[0050] Further, referring to Figures 2 to 9, the upper mold 3 also includes a base plate 33, which is fixed to the bottom of the mounting seat 2 by an adjusting bolt 34. A rod 35 is fixed to the top of the upper mold body 31, and the rod 35 passes through the base plate 33 and is movably connected to the base plate 33. A first spring 36 is arranged on the outer sleeve of the rod 35, and the bottom end of the first spring 36 is fixed to the upper mold body 31, and the top end of the first spring 36 is fixed to the base plate 33. A slot 37 is provided in the top wall of the mold cavity 32, and the ejector pin 61 is arranged in the slot 37. The top end of the ejector pin 61 is movably connected to the upper mold body 31 and the base plate 33, and the bottom end of the ejector pin 61 extends to the bottom of the mold cavity 32. A stopper 62 is fixed to the middle of the ejector pin 61, and a second spring 63 is arranged on the outer sleeve of the ejector pin 61. The top end of the second spring 63 is fixed to the inner wall of the slot 37, and the bottom end of the second spring 63 is fixed to the stopper 62.

[0051] The adjusting bolts 34 are the same as those in the prior art. Four adjusting bolts 34 are preferably provided for adjusting the height of the base plate 33. The insert rod 35 is vertically provided. A strip slider is provided on the side wall of the insert rod 35. A slide groove matching the strip slider is provided on the base plate 33. In the initial state, the horizontal height of the bottom end of the ejector pin 61 is lower than the horizontal height of the bottom of the upper mold body 31. Therefore, when the upper mold body 31 moves downward, the ejector pin 61 contacts the upper plastic part earlier than the upper mold body 31. The stopper 62 and the slot 37 are both circular. The diameter of the stopper 62 is smaller than the diameter of the slot 37. When the upper plastic part moves into the mold cavity 32, the ejector pin 61 can be pushed into the slot 37.

[0052] When the upper mold body 31 is in use, the lower mold body 31 moves downward, which drives the adjusting bolt 34 to move. The lower mold body 33 moves downward, which drives the base plate 33 to move. The base plate 33 moves downward, which drives the first spring 36 to move downward. The upper mold body 31 moves downward, which drives the second spring 63 to move downward. The second spring 63 moves downward, which drives the ejector pin 61 to move downward. The ejector pin 61 cannot move further when it contacts the upper plastic part. The upper mold body 31 that continues to move downward squeezes the second spring 63, causing the second spring 63 to be compressed and move relative to the ejector pin 61. When the upper plastic part is in the correct position, the upper mold body 31 will continue to move downward until the top of the upper plastic part is in contact with the inner wall of the mold cavity 32. At this time, the bottom end of the ejector pin 61 is completely retracted into the slot 37. When the position of the upper plastic part is offset, the bottom of the upper mold body 31 will contact the offset upper plastic part, causing the upper mold body 31 to be unable to move further. At this time, the ejector pin 61 no longer moves relative to the upper mold body 31, and the ejector pin 61 only retracts into the mold cavity 32.

[0053] By setting the monitoring component 6 as a movable ejector pin 61, the relative displacement between the ejector pin 61 and the upper mold body 31 can be used to determine whether the upper plastic part has successfully entered the mold cavity 32, which is conducive to determining whether the position of the upper plastic part has shifted. It has high accuracy, simple structure, and is easy to maintain.

[0054] Further, referring to Figures 3 to 9, the welding protection assembly 7 includes a first copper wiring sheet 71 and a second copper wiring sheet 72. The first copper wiring sheet 71 and the second copper wiring sheet 72 are symmetrically distributed on both sides of the ejector pin 61 and are both fixed to the upper mold body 31. A first wire 73 is fixed to the first copper wiring sheet 71. The end of the first wire 73 away from the first copper wiring sheet 71 is connected to the coil 5. The end of the coil 5 away from the first wire 73 is connected to the welding machine body 1. A second wire 74 is fixed to the second copper wiring sheet 72. The second wire 74 is connected to the welding machine body 1. A conductive copper block 75 is provided in the middle of the ejector pin 61. The conductive copper block 75 passes through the ejector pin 61 and is fixedly connected to the ejector pin 61.

[0055] The upper mold body 31 and the ejector pin 61 are both made of insulating material. In the initial state, no electrical conduction occurs between the first copper plate 71 and the second copper plate 72, and the circuit where the coil 5 is located is in an open circuit state. The first wire 73 and the second wire 74 are both flexible and can bend with the movement of the upper mold 3 without affecting the continuity of the circuit.

[0056] When in use, when the position of the upper plastic part and the lower plastic part after being combined is accurate, the ejector pin 61 and the upper mold body 31 are relatively displaced and then come to rest. At this time, the conductive copper block 75 on the ejector pin 61 can just move between the first connecting copper plate 71 and the second connecting copper plate 72, and the conductive copper block 75 is in contact with the first connecting copper plate 71 and the second connecting copper plate 72 at the same time. At this time, the conductive copper block 75 closes the circuit where the coil 5 is located. When the coil 5 is energized, it can heat the metal medium for welding. When the position of the upper plastic part is offset, the relative displacement of the ejector pin 61 and the upper mold body 31 changes. The conductive copper block 75 on the ejector pin 61 cannot move between the first connecting copper plate 71 and the second connecting copper plate 72, nor can it contact the first connecting copper plate 71 and the second connecting copper plate 72 at the same time, so that the circuit where the coil 5 is located is still in an open circuit state. The coil 5 cannot be energized and cannot heat the metal medium. Therefore, when the position of the upper plastic part is offset, welding cannot be performed.

[0057] By setting the welding protection component 7 to the first wiring copper plate 71, the second wiring copper plate 72, the first wire 73 and the second wire 74, the circuit where the coil 5 is located is in an open circuit state in the initial state. It can only be turned on when the upper plastic part is accurately positioned and the upper mold 3 and the lower mold 4 are smoothly merged. This is beneficial to effectively prevent the coil 5 from heating the metal medium on the lower plastic part when the position of the upper plastic part is offset, thereby avoiding invalid welding that damages the lower plastic part and reducing economic losses caused by human operational errors.

[0058] Further, referring to Figures 10 to 13, the squeeze protection assembly 8 includes a collar 81, which is fixed to the top of the base plate 33. The collar 81 is located between the insertion rod 35 and the ejector pin 61. A latch 82 is movably inserted in the collar 81. A clamping block 83 is fixed to the end of the latch 82 near the insertion rod 35. A third spring 84 is disposed on the outer sleeve of the latch 82. The two ends of the third spring 84 are respectively fixed to the clamping block 83 and the collar 81. A slot 351 is provided on the side wall of the insertion rod 35. The clamping block 83 engages with the slot 351. A first magnetic block 85 is fixed to the end of the latch 82 near the ejector pin 61. A second magnetic block 86 is fixed to the middle of the ejector pin 61.

[0059] In the initial state, the locking action of the locking block 83 and the locking groove 351 can achieve a stable connection between the insertion rod 35 and the base plate 33, preventing the insertion rod 35 from moving freely. The first magnetic block 85 is configured as an electromagnet, and the second magnetic block 86 is configured as a permanent magnet. In actual application, when the position of the upper plastic part and the lower plastic part after merging is accurate, the time from the ejector 61 contacting the upper plastic part to the ejector 61 and the upper mold body 31 being relatively stationary is set to Δt. When the bottom end of the ejector 61 contacts the upper plastic part, the first magnetic block 85 is configured to generate magnetism after being energized after the time Δt.

[0060] During use, when the upper plastic part is in the correct position, the ejector pin 61 and the upper mold body 31 undergo relative displacement and then come to rest. During the relative displacement of the ejector pin 61 and the upper mold body 31, the second magnetic block 86 on the ejector pin 61 also moves together. During this process, the second magnetic block 86 first moves close to the first magnetic block 85 and then moves away from the first magnetic block 85. When the position of the upper plastic part is offset, the relative displacement of the ejector pin 61 and the upper mold body 31 changes. At this time, after the relative movement of the ejector pin 61 and the upper mold body 31, the second magnetic block 86 on the ejector pin 61 just moves to the position corresponding to the first magnetic block 85. Then, after the time Δt is reached, the first magnetic block 85 is energized and generates magnetic force. At this time, the second magnetic block 86 attracts the first magnetic block 85, causing the first magnetic block 85 to move to fit the second magnetic block 86. When the first magnetic block 85 moves, it drives the latch 82 to move. When the latch 82 moves, it drives the clamping block 83 to move. When the clamping block 83 moves, it compresses the third spring 84. Finally, the clamping block 83 completely disengages from the clamping groove 351, thereby releasing the fastening state between the insertion rod 35 and the base plate 33. At this time, the downwardly moving base plate 33 will not directly apply pressure to the upper plastic part through the insertion rod 35 and the lower mold body, but will compress the first spring 36. The elastic force generated by the compression of the first spring 36 acts on the upper plastic part through the upper mold body 31, greatly reducing the pressure on the upper plastic part.

[0061] By setting up the extrusion protection component 8, when the position of the upper plastic part is offset, the extrusion protection component 8 releases the fixed connection between the insertion rod 35 and the base plate 33, so that the upper mold body 31 is connected to the base plate 33 only through the first spring 36, and then the downward pressure is converted into the elastic force after the compression of the first spring 36, which greatly reduces the pressure on the upper plastic part, thereby effectively protecting the upper plastic part, avoiding damage to the upper plastic part, improving safety, and reducing economic losses.

[0062] Further, referring to FIG10 and FIG11 , a pressure sensor 9 is provided at the connection between the first spring 36 and the base plate 33 , and an alarm 10 is fixed on the welding machine body 1 ;

[0063] Among them, the pressure sensor 9 is electrically connected to the welding machine body 1, and the alarm 10 is also electrically connected to the welding machine body 1. During use, when the position of the upper plastic part is offset, the squeeze protection component 8 is operated to compress the first spring 36. The elastic force of the first spring 36 triggers the pressure sensor 9. The pressure sensor 9 transmits an electrical signal to the welding machine body 1, and the welding machine body 1 controls the alarm 10 to operate;

[0064] By providing the pressure sensor 9 and the alarm 10 , it is advantageous to control the operation of the alarm 10 when the position of the upper plastic part is offset, thereby conveniently prompting the operator.

[0065] Further, referring to FIG5 , a guide rod 11 is fixedly connected to the top of the upper mold body 31 , and the guide rod 11 is movably plugged into the base plate 33 ;

[0066] There are four guide rods 11, which are evenly arranged on the top of the upper mold body 31. A linear bearing is provided at the connection between the guide rods 11 and the base rod. By providing the guide rods 11, it is beneficial to guide the upper mold body 31 when the upper mold body 31 moves.

[0067] Working principle: When in use, first combine the upper plastic part and the lower plastic part and then put them into the lower mold 4. The welding machine body 1 controls the mounting base 2 to move downward. When the mounting base 2 moves downward, it drives the adjusting bolt 34 to move. When the adjusting bolt 34 moves downward, it drives the base plate 33 to move. When the base plate 33 moves, it drives the first spring 36 to move downward. When the first spring 36 moves downward, it drives the upper mold body 31 to move downward. When the upper mold body 31 moves downward, it drives the second spring 63 to move downward. When the second spring 63 moves downward, it drives the ejector pin 61 to move downward. When the ejector pin 61 contacts the upper plastic part, it cannot move further, and continues to move. The upper mold body 31 that continues to move downward squeezes the second spring 63, compressing the second spring 63 and moving relative to the ejector pin 61. When the upper plastic part is in the correct position, the upper mold body 31 will continue to move downward until the top of the upper plastic part abuts the inner wall of the mold cavity 32. At this time, the bottom end of the ejector pin 61 is completely retracted into the slot 37. When the position of the upper plastic part shifts, the bottom of the upper mold body 31 contacts the shifted upper plastic part, preventing the upper mold body 31 from moving further. At this time, the ejector pin 61 no longer moves relative to the upper mold body 31 and only retracts into the mold cavity 32.

[0068] When the upper and lower plastic parts are accurately positioned after being combined, the ejector pin 61 and the upper mold body 31 undergo relative displacement and then come to rest. At this time, the conductive copper block 75 on the ejector pin 61 can just move between the first and second wiring copper plates 71, 72, and the conductive copper block 75 simultaneously contacts the first and second wiring copper plates 71, 72. At this time, the conductive copper block 75 closes the circuit where the coil 5 is located. When the coil 5 is energized, it can heat the metal medium to facilitate welding. At the same time, during the relative displacement of the ejector pin 61 and the upper mold body 31, the second magnetic block 86 on the ejector pin 61 also moves together. During this process, the second magnetic block 86 first moves close to the first magnetic block 85 and then moves away from the first magnetic block 85.

[0069] When the position of the upper plastic part is offset, the relative displacement of the ejector pin 61 and the upper mold body 31 changes. The conductive copper block 75 on the ejector pin 61 cannot move between the first wiring copper plate 71 and the second wiring copper plate 72, nor can it contact the first wiring copper plate 71 and the second wiring copper plate 72 at the same time, so that the circuit where the coil 5 is located is still in an open circuit state, the coil 5 cannot be energized, and the metal medium cannot be heated. Therefore, when the position of the upper plastic part is offset, welding cannot be performed. At the same time, when the position of the upper plastic part is offset, the relative displacement of the ejector pin 61 and the upper mold body 31 changes. At this time, after the ejector pin 61 and the upper mold body 31 move relative to each other, the second magnetic block 86 on the ejector pin 61 just moves to the position corresponding to the first magnetic block 85. Then the first magnetic block 85 is energized and generates magnetic force. The second magnetic block 86 then attracts the first magnetic block. 85, so that the first magnetic block 85 moves to fit the second magnetic block 86. When the first magnetic block 85 moves, it drives the latch 82 to move. When the latch 82 moves, it drives the block 83 to move. When the block 83 moves, it compresses the third spring 84. Finally, the block 83 completely disengages from the slot 351, thereby releasing the fastening state between the insertion rod 35 and the base plate 33. At this time, the downward-moving base plate 33 will not directly apply pressure to the upper plastic part through the insertion rod 35 and the lower mold body, but will compress the first spring 36. The elastic force generated by the compression of the first spring 36 acts on the upper plastic part through the upper mold body 31, and the pressure on the upper plastic part is greatly reduced. In addition, the elastic force of the compressed first spring 36 triggers the pressure sensor 9, and the pressure sensor 9 transmits an electrical signal to the welding machine body 1. The welding machine body 1 controls the alarm 10 to operate to prompt the operator;

[0070] By improving the upper mold 3 and setting a monitoring component 6, a welding protection component 7 and an extrusion protection component 8, when the monitoring component 6 detects the position deviation of the upper plastic part through the ejector pin 61, the welding protection component 7 is activated and controls the circuit of the coil 5 to be in an off state, thereby preventing the coil 5 from heating the metal medium on the lower plastic part, thereby preventing the metal medium from damaging the lower plastic part after heating. At the same time, after the extrusion protection component 8 is activated, the pressure of the upper mold body 31 on the upper plastic part is reduced, thereby preventing the upper mold body 31 from continuously pressing the upper plastic part with a large pressure to cause deformation or damage to the upper plastic part. In this way, it is beneficial to the upper and lower plastic parts. The upper mold body 31, the ejector pin 61 and the latch 82 are reset respectively by arranging the first spring 36, the second spring 63 and the third spring 84, which is conducive to resetting the upper mold body 31, the ejector pin 61 and the latch 82, and is conducive to reuse. The upper mold body 31, the ejector pin 61 and the latch 82 are reset respectively by arranging the first spring 36, the second spring 63 and the third spring 84, and are ..., and are conducive to reuse. The upper mold body 31, the ejector pin 61 and the latch 82 are reset respectively, and are conducive to reuse. The upper mold body 31, the ejector pin 61 and the latch 82 are reset respectively, and the upper mold body 31, the ejector pin 61 and the latch 82 are reset respectively, and the upper mold body 31, the upper mold body 31 and the upper mold body 31 are not prone to damage, and have a long service life and are convenient for maintenance. The upper mold body 31 and the upper mold body 31 are protected at the same time, which greatly reduces the probability of product damage, reduces economic losses and is safer. The upper mold body 31 and the

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high frequency induction welding machine, comprising a welding machine body (1), a mounting seat (2), an upper mold (3) and a lower mold (4), characterized in that: The lower mold (4) is provided with a coil (5), and the upper mold (3) is provided with a monitoring component (6), a welding protection component (7) and an extrusion protection component (8); The upper mold (3) comprises an upper mold body (31), and a mold cavity (32) is provided at the bottom of the upper mold body (31); The monitoring component (6) is mounted on the upper mold (3), the monitoring component (6) comprises an ejector pin (61) movably connected to the upper mold (3), and the monitoring component (6) is used to determine whether the position of the upper plastic part is offset; The welding protection component (7) is mounted on the upper mold (3) and connected to the coil (5), and the welding protection component (7) is used to control the circuit of the coil (5) to be disconnected when the position of the upper plastic part is offset; The extrusion protection component (8) is installed on the upper mold (3), and the extrusion protection component (8) is used to reduce the pressure of the upper mold (3) on the upper plastic part when the position of the upper plastic part is offset; When the welding machine body (1) controls the upper mold (3) to move downward, the upper plastic part pushes the ejector pin (61) to move. When the ejector pin (61) does not move to the specified position, it is determined that the position of the upper plastic part is offset, and the welding protection component (7) disconnects the circuit of the coil (5). At the same time, the pressure of the upper mold (3) moving downward on the upper plastic part is reduced. The upper mold (3) further comprises a base plate (33), the base plate (33) being fixed to the bottom of the mounting seat (2) by means of an adjusting bolt (34), a plug rod (35) being fixed to the top of the upper mold body (31), the plug rod (35) penetrating the base plate (33) and being movably plugged with the base plate (33), a first spring (36) being disposed on the outer sleeve of the plug rod (35), the bottom end of the first spring (36) being fixed to the upper mold body (31), and the top end of the first spring (36) being fixed to the base plate (33); A slot hole (37) is formed on the top wall of the mold cavity (32), and the ejector pin (61) is arranged in the slot hole (37). The top end of the ejector pin (61) is movably connected to the upper mold body (31) and the base plate (33). The bottom end of the ejector pin (61) extends to the bottom of the mold cavity (32). A stopper (62) is fixed in the middle of the ejector pin (61). A second spring (63) is arranged on the outer sleeve of the ejector pin (61). The top end of the second spring (63) is fixed to the inner wall of the slot hole (37), and the bottom end of the second spring (63) is fixed to the stopper (62). The welding protection component (7) comprises a first copper wiring sheet (71) and a second copper wiring sheet (72), wherein the first copper wiring sheet (71) and the second copper wiring sheet (72) are symmetrically distributed on both sides of the ejector pin (61) and are both fixed to the upper mold body (31); a first wire (73) is fixed to the first copper wiring sheet (71); an end of the first wire (73) away from the first copper wiring sheet (71) is connected to the coil (5); an end of the coil (5) away from the first wire (73) is connected to the welding machine body (1); a second wire (74) is fixed to the second copper wiring sheet (72); and the second wire (74) is connected to the welding machine body (1); A conductive copper block (75) is disposed in the middle of the ejector pin (61), and the conductive copper block (75) penetrates the ejector pin (61) and is fixedly connected to the ejector pin (61); The extrusion protection component (8) comprises a collar (81), the collar (81) being fixed on the top of the base plate (33), the collar (81) being located between the insertion rod (35) and the ejector pin (61), a latch (82) being movably inserted in the collar (81), a clamping block (83) being fixed at one end of the latch (82) close to the insertion rod (35), a third spring (84) being disposed on the outer sleeve of the latch (82), two ends of the third spring (84) being respectively fixed to the clamping block (83) and the collar (81), a clamping groove (351) being provided on the side wall of the insertion rod (35), and the clamping block (83) being clamped in the clamping groove (351).

2. A high frequency induction welding machine according to claim 1, characterized in that: A first magnetic block (85) is fixedly connected to one end of the latch pin (82) close to the ejector pin (61), and a second magnetic block (86) is fixed to the middle of the ejector pin (61).

3. A high frequency induction welding machine according to claim 1, characterized in that: A pressure sensor (9) is provided at the connection point between the first spring (36) and the base plate (33), and an alarm (10) is fixed on the welding machine body (1).

4. A high frequency induction welding machine according to claim 1, characterized in that: A guide rod (11) is fixedly connected to the top of the upper mold body (31), and the guide rod (11) is movably plugged into the base plate (33).

Images