A mold repair laser welder

Abstract

This invention provides a laser welding machine for mold repair, belonging to the field of mold welding and repair technology. It includes a protective cover, with an electric actuator mounted on the top of the cover. A displacement module is mounted on the power end of the electric actuator, and a second displacement module is mounted on the first displacement module. A face-changing module is installed at the bottom of the protective cover. The face-changing module includes a support platform, on which a circular piece is rotatably mounted. A constraint module and a constraint part are also mounted on the support platform. This invention solves the problem that during repair, different surfaces of the mold may need to be treated, and changing the face manually is difficult due to weight, and requires repeated face-changing and constraint operations, which is cumbersome.

Description

Technical Field

[0001] This invention belongs to the field of mold welding and repair technology, and specifically relates to a mold repair laser welding machine. Background Technology

[0002] Injection molds are indispensable tools in the production of plastic products, and their precision and integrity directly affect product quality and production efficiency. Over long-term use, molds may develop cracks, chips, or other damage due to wear, impact, or other reasons. If this damage is not repaired promptly, it will seriously affect the mold's lifespan and product quality.

[0003] Laser welding technology is a melting welding technology that uses a high-energy-density laser beam as a heat source. Currently, molds may encounter some problems during actual operation, and lasers are used to repair them. During the repair process, different surfaces of the mold may need to be treated. However, it is difficult for operators to change the surfaces themselves due to the weight, and the process of changing surfaces and applying constraints repeatedly is quite cumbersome. Therefore, a laser welding machine for mold repair is proposed. Summary of the Invention

[0004] This invention provides a laser welding machine for mold repair, which aims to solve the problem that during the repair process, different surfaces of the mold may need to be treated, and it is difficult for operators to change the surfaces themselves due to the weight, and the process of changing surfaces and constraining is cumbersome.

[0005] This invention provides a laser welding machine for mold repair, including a protective cover. An electric push rod is installed on the top of the protective cover, a displacement module is installed on the power end of the electric push rod, a displacement module is installed on the displacement module, and a face-changing module is installed at the bottom of the protective cover. The face-changing module includes a support platform, on which a ring-shaped piece is rotatably mounted. A constraint module and a constraint part one are mounted on the support platform. A constraint piece is mounted on the constraint module. The constraint part one is used to pull the constraint piece to lock the mold. The constraint module is used to constrain the mold. The constraint module is equipped with a traction module, a high-low displacement module, and a face-changing surface. The traction module is used to pull the adapted high-low displacement module and face-changing surface to slide, thereby initially allowing the high-low displacement module to pull the constraint piece to move to a higher position, and then allowing the face-changing surface to pull the constraint piece to rotate and change its surface.

[0006] Preferably, the lower walls of the four corners of the support platform are supported by column legs.

[0007] Preferably, the constraint module includes a locking frame, a pair of which are mirror-mounted. The locking frame has a displacement hole facing upwards. The constraint piece is slidably connected to the displacement hole of the locking frame. The locking frame is slidably mounted on the support platform. A pair of pieces are mounted on the plate body. The piece body is fixedly connected to the connecting piece. The pair of pieces are mounted on both sides of the first disc body. The first disc body is engaged with the piece body.

[0008] Preferably, the traction module includes a traction rod, a traction plate is fixedly connected to the traction rod, a traction cylinder is fixedly connected to the traction plate, and two rows of sliding rods are arranged in a ring on the traction cylinder. Each row of sliding rods is equipped with several sliding rods, which are evenly spaced. The sliding rods are slidably mounted on the side wall of the traction cylinder. An elastic element three is installed on each sliding rod, and one side of the elastic element three is fixedly connected to the traction platform. The traction platforms on the two rows of sliding rods face away from each other.

[0009] Preferably, the high and low displacement module includes a second rotating ring with several openings evenly spaced on it. The second rotating ring is rotatably mounted on a support frame. The openings on the second rotating ring are plugged into and connected to one row of traction platforms. The second rotating ring is fixedly connected to a mounting base. The mounting base is fixedly connected to a threaded rod. The threaded rod is rotatably mounted on a support column. A displacement platform is mounted on the threaded rod. The displacement platform is threadedly connected to the threaded rod. A face-changing rod is rotatably connected to the displacement platform. The face-changing rod is fixedly connected to a constraint plate.

[0010] Preferably, the high and low displacement module is equipped with a second constraint part, which is used to constrain the rotation of the face-changing rod.

[0011] Preferably, the second constraint part includes a constraint column, which is slidably mounted on the displacement platform. An elastic element four is mounted on the constraint column, and a constraint ring is fixedly connected to the constraint column. The constraint cavity of the constraint ring is inserted and connected to the constraint platform. The constraint platform is fixedly connected to the face-changing rod. A pressing rod is fixedly connected to the constraint ring. The pressing rod is fitted and connected to the interlocking platform. The interlocking platform is fixedly connected to the support frame.

[0012] Preferably, the face-changing section includes a rotating ring one, on which a plurality of openings are equally spaced. The openings on the rotating ring one are connected to the traction table. The rotating ring one is fixedly connected to the umbrella disc five. The rotating ring one is rotatably mounted on the support frame. The umbrella disc five is engaged with the umbrella disc three. The umbrella disc three and the disc body two are mounted on the same rod. The disc body two is rotatably connected to the locking frame. The disc body two and the disc body four are engaged with each other. The disc body four is fixedly connected to the face-changing rod.

[0013] Preferably, the first constraint part includes a stop platform, a pair of stop platforms are mirror-mounted, the stop platforms are fixed to the displacement rod, the displacement rod is slidably mounted on the bending plate, and the bending plate is fixedly connected to the power end of the second electric actuator.

[0014] Preferably, the first displacement module includes an assembly frame, a threaded rod, a motor, and a threaded connector. The assembly frame is connected to the power end of the electric actuator. The first motor is mounted on one side of the assembly frame. The rotating rod of the first motor is fixedly connected to the threaded rod, which is rotatably connected to the assembly frame. The threaded rod is threadedly connected to the threaded connector. The second displacement module has the same structure as the first displacement module, and a laser welding head is mounted on the second displacement module.

[0015] The beneficial effects of this invention are as follows: 1. This invention can self-constrain and straighten the mold, making laser repair of the mold and subsequent actions more convenient.

[0016] 2. This invention can constrain and lock multiple side walls of the mold and achieve the goal of changing the surface, which is convenient for subsequent processing. By installing the surface changing module, this invention can change all the side walls of the mold to face upwards, eliminating the need for operators to perform tedious locking and surface changing actions, making it easy and convenient.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the front side of the protective cover without the inner structure according to an embodiment of the present invention; Figure 3 This is a top view of the support platform structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure below the support platform according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the right side view of the disk body according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the traction cylinder structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly base structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the displacement stage structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of displacement module one according to an embodiment of the present invention; reference numerals: 11, protective cover; 12, electric actuator one; 13, displacement module one; 131, assembly frame; 132, threaded rod one; 133, motor one; 134, threaded joint; 14, displacement module two; 152, electric actuator two; 153, bending piece; 154, displacement rod; 155, elastic element one; 156, stop platform; 157, support platform; 158, ring-shaped piece; 159, guide bar one; 1520, connecting piece; 1521, locking frame; 1522, plate body; 1523, disc body one; 1524, motor two; 1525, assembly frame one; 1526, motor three; 1527, assembly frame two; 1528 1529. Motor; 1530. Support frame; 1531. Disc body 2; 1532. Umbrella disc 3; 1533. Connecting platform; 1534. Disc body 4; 1535. Constraint plate; 1536. Threaded rod; 1537. Support column; 1538. Umbrella disc 5; 1539. Traction rod; 1540. Traction cylinder; 1541. Rotating ring 1; 1542. Traction platform; 1543. Sliding rod; 1544. Elastic element 3; 1545. Assembly seat; 1546. Rotating ring 2; 1547. Changing bar; 1548. Constraint ring; 1549. Constraint platform; 1550. Pressing bar; 1551. Displacement platform; 1552. Constraint column; 1553. Elastic element 4. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-9 This invention provides a laser welding machine for mold repair, including a protective cover 11, an electric push rod 12 installed on the top of the protective cover 11, a displacement module 13 installed on the power end of the electric push rod 12, a displacement module 2 14 installed on the displacement module 13, and a face-changing module installed at the bottom of the protective cover 11. The displacement module 13 includes an assembly frame 131, a threaded rod 132, a motor 133, and a threaded joint 134. The assembly frame 131 is connected to the power end of the electric push rod 12. The motor 133 is installed on one side of the assembly frame 131. The rotating rod of the motor 133 is fixedly connected to the threaded rod 132, which is rotatably connected to the assembly frame 131. The threaded joint 134 is threadedly connected to the threaded rod 132. The inner top wall of the threaded rod 132 is fixedly connected to the guide bar 2. The top of the threaded joint 134 is slidably connected to the guide bar 2. The operation of the motor 133 pulls the threaded rod 132 to rotate, so that the threaded joint 134 is displaced under the pull of the threaded rod 132, which in turn pulls the displacement module 14 to move. The displacement module 14 then pulls the laser welding head to move, which can repair the upward side of the mold. It has a wide range and strong adaptability. The structure of displacement module 2 14 is the same as that of displacement module 1 13. Displacement module 1 13 and displacement module 2 14 are arranged in a cross shape and can be displaced in two directions. The bottom of the wire joint 134 on displacement module 2 14 is fixedly connected to the laser welding head. The wire joint 134 in displacement module 1 13 is fixedly connected to the assembly frame 131 of displacement module 2 14. The face-changing module includes a traction module, a high / low displacement module, a face-changing section, a constraint module, a constraint part one, a support platform 157, a ring-shaped piece 158, a motor three 1526, an assembly frame two 1527, and a constraint piece 1534. The lower walls of the four corners of the support platform 157 are supported by column legs. Several displacement holes are installed on the support platform 157. The ring-shaped piece 158 is rotatably mounted on the support platform 157. Several displacement holes are installed on the ring-shaped piece 158. The displacement holes on the support platform 157 and the displacement holes on the ring-shaped piece 158 are matched one-to-one. The ring-shaped piece 158 and the motor three 1526 are also matched. The 526 rotating rod is fixed, the motor 3 1526 is fixed on the support platform 157, the assembly frame 2 1527 is fixed on the guide bar 159, the support platform 157 is equipped with a constraint module, the constraint module is equipped with a constraint plate 1534, the constraint part 1 is used to pull the constraint plate 1534 to perform the action of locking the mold, the traction module is used to pull the high and low displacement modules and the changing surface to move, thereby allowing the high and low displacement modules to pull the constraint plate 1534 to move to a higher position, and then allowing the changing surface to pull the constraint plate 1534 to rotate and change the surface, the constraint module is used to constrain the position of the mold.

[0021] The constraint module includes guide bar 159, connecting piece 1520, locking frame 1521, plate 1522, disc 1523, motor 1524, and assembly frame 1525. A pair of locking frames 1521 are mirror-mounted, and each locking frame 1521 has a displacement hole facing upwards. The constraint piece 1534 slides along the displacement hole of the locking frame 1521. The locking frame 1521 is slidably mounted on the support platform 157. A pair of plates 1522 are mounted, and each plate 1522 is fixedly connected to the connecting piece 1520. The connecting piece 1520 is fixedly connected to the locking frame 1521. The plate 1520 is slidably mounted on the guide bar 159. The guide bar 159 is fixed to the support platform 157. The pair of plates 1522 are mounted on both sides of the disc body 1523. The plates 1522 have pre-reserved equally spaced teeth. The disc body 1523 has pre-reserved several equally spaced teeth. The disc body 1523 and the plates 1522 are meshed and connected. The disc body 1523 is fixed to the rotating rod of the motor 2 1524. The motor 2 1524 is fixed to the assembly frame 1525. The assembly frame 1525 is fixed to the guide bar 159.

[0022] The traction module includes a motor 1528, a traction rod 1538, a traction plate 1539, a traction cylinder 1540, a traction platform 1542, a sliding bar 1543, and an elastic element 1544. The motor 1528 is fixedly connected to the locking frame 1521. The rotating rod of the motor 1528 is fixedly connected to the traction rod 1538. The traction plate 1539 is fixedly connected to the traction rod 1538, and the traction cylinder 1540 is fixedly connected to the traction plate 1539. The traction cylinder 1540 has two rows of sliding bars 1543 arranged in a circular shape, and each row of sliding bars 1543 is equipped with several sliding rods. A number of sliding rods 1543 are installed at equal intervals. The sliding rods 1543 are slidably installed on the side wall of the traction cylinder 1540. An elastic element 1544 is installed on the sliding rod 1543. One side of the elastic element 1544 is fixed to the traction platform 1542, and the other side of the elastic element 1544 is fixed to the traction cylinder 1540. A traction platform 1542 is fixed to each sliding rod 1543. The traction platform 1542 is a triangular prism with one of its angles being 90 degrees. The traction platforms 1542 on the two rows of sliding rods 1543 face away from each other.

[0023] The high and low displacement module includes a support frame 1529, a threaded rod 1535, a support column 1536, an assembly base 1545, a second rotating ring 1546, a face-changing rod 1547, and a displacement platform 1551. The support frame 1529 is fixedly connected to the locking frame 1521. The second rotating ring 1546 is rotatably connected to the support frame 1529. Several openings are evenly spaced on the second rotating ring 1546, and the openings on the second rotating ring 1546 are plugged into and connected to one of the rows of traction platforms 1542. Rotating ring 1546 is fixedly connected to mounting base 1545. Mounting base 1545 is fixedly connected to threaded rod 1535. Threaded rod 1535 is rotatably mounted on support column 1536. Support column 1536 is fixedly connected to locking bracket 1521. Displacement platform 1551 is mounted on threaded rod 1535. Displacement platform 1551 is threadedly connected to threaded rod 1535. Face changing rod 1547 is rotatably connected to displacement platform 1551. Face changing rod 1547 is fixedly connected to constraint piece 1534.

[0024] The high and low displacement module is equipped with a second constraint part, which is used to constrain the rotation of the face-changing rod 1547.

[0025] The second constraint section includes a connecting platform 1532, a constraint ring 1548, a constraint table 1549, a pressure bar 1550, a displacement table 1551, and a constraint post 1552. A pair of constraint posts 1552 are mounted on the displacement table 1551 and slidably mounted on it. An elastic element 1553 is mounted on the constraint post 1552. One side of the elastic element 1553 is fixedly mounted on the displacement table 1551, and the other side is fixedly mounted on the constraint post 1552. The constraint ring 1548 is fixedly connected to the constraint post 1552. Several constraint cavities are equally spaced on the constraint ring 1548. The constraint cavities of the constraint ring 1548 are inserted and connected to the constraint platform 1549. The constraint platform 1549 is fixedly connected to the face-changing rod 1547. The pressure rod 1550 is fixedly connected to the constraint ring 1548. The pressure rod 1550 is fitted and connected to the interlocking platform 1532. The interlocking platform 1532 is fixedly connected to the support frame 1529.

[0026] The face-changing device includes a second disc 1530, a third umbrella disc 1531, a fourth disc 1533, a fifth umbrella disc 1537, and a first rotating ring 1541. The first rotating ring 1541 is rotatably mounted on a support frame 1529. Several openings are evenly spaced on the first rotating ring 1541, and these openings are plugged into the traction table 1542. The first rotating ring 1541 is fixedly connected to the fifth umbrella disc 1537, which has several pre-drilled teeth. The third umbrella disc 1531 also has pre-drilled teeth. With several teeth, the umbrella disc five 1537 and the umbrella disc three 1531 are engaged and connected. The umbrella disc three 1531 and the disc body two 1530 are installed on the same rod. The disc body two 1530 is rotatably connected to the locking frame 1521. The disc body two 1530 is provided with several teeth at equal intervals. The disc body four 1533 is provided with several teeth that match those on the disc body two 1530. The disc body two 1530 and the disc body four 1533 are engaged and connected. The disc body four 1533 is fixedly connected to the face-changing rod 1547.

[0027] The first restraint unit includes an electric actuator 152, a bending plate 153, a displacement rod 154, an elastic element 155, and a stop platform 156. A pair of stop platforms 156 are mirror images of each other. The stop platforms 156 are fixed to the displacement rod 154. An elastic element 155 is mounted on the displacement rod 154. One side of the elastic element 155 is fixed to the stop platform 156, and the other side of the elastic element 155 is fixed to the bending plate 153. The displacement rod 154 is slidably mounted on the bending plate 153. The bending plate 153 is fixed to the power end of the electric actuator 152. The electric actuator 152 is fixed between the column legs.

[0028] The specific implementation method is as follows: During operation, the mold is placed on the support platform 157 from the side. During the period when the mold and the stop platform 156 are in contact with the slope, the mold pulls the stop platform 156 to move. The displacement bar 154 on the stop platform 156 slides on the bending piece 153, and the elastic element 155 is compressed. After the mold moves to the ring piece 158 and the mold and the stop platform 156 separate and are in contact, the stop platform 156 returns to its original position under the effect of the elastic element 155.

[0029] During the period when the mold needs to be constrained, the second motor 1524 is run, the second motor 1524 pulls the first disc 1523 to rotate, the first disc 1523 pulls a pair of plates 1522 to move, the connecting plate 1520 on the plate 1522 slides on the first guide bar 159, and each pair of plates 1522 pulls a pair of locking frames 1521 to move towards the position of the adjacent mold via the connecting plate 1520, and the constraint plate 1534 on the locking frame 1521 locks and constrains the mold; the second pair of electric push rods 152 are run, the second electric push rods 152 pull the stop platform 156 on the displacement bar 154 via the bending plate 153 to constrain and lock the mold, so that the mold can be locked from several directions.

[0030] When laser welding is required on other wall surfaces of the mold, the electric actuator 152 pulls the stop platform 156 to a position where it cannot fit with the mold; the motor 1528 is activated, the rotating rod of the motor 1528 rotates in the opposite direction, the motor 1528 pulls the traction rod 1538 to rotate, the traction rod 1538 pulls the traction plate 1539 and the traction cylinder 1540 to rotate, the slope on the row of traction platforms 1542 on the traction cylinder 1540 fits with the opening on the rotating ring 1541, during the rotation of the traction cylinder 1540, the elasticity of the elastic element 1544 cannot pull the rotating ring 1541 to rotate, the opening on the rotating ring 1541 allows the sliding bar 1543 on the traction platform 1542 to slide on the traction cylinder 1540, the traction platform 1542 will squeeze the elastic element 1544, thus the traction platform 1542 cannot pull the rotating ring 1541 to rotate; the traction cylinder 1544... The parallel edge of the other row of traction platforms 1542 on 40 is in contact with the opening on the rotating ring 1546. The traction platform 1542 pulls the rotating ring 1546 to rotate. The rotating ring 1546 pulls the mounting base 1545 to rotate. The mounting base 1545 pulls the threaded rod 1535 to rotate. The threaded rod 1535 pulls the displacement platform 1551 to move upward. The displacement platform 1551 pulls the disc 1533 and the constraint plate 1534 to move upward via the face-changing rod 1547. When the disc 1533 and the disc 1530 are engaged, the rotating rod of the motor 1528 no longer rotates in the opposite direction. Because the threaded rod 1535 can achieve the purpose of moving the connected structure back and forth without changing the direction of rotation, the threaded rod 1535 can pull the displacement platform 1551 to move downward while the rotating rod of the motor 1528 continues to rotate in the opposite direction.

[0031] During the upward displacement of the displacement platform 1551, after the pressure bar 1550 and the interlocking platform 1532 come into contact with each other, the displacement platform 1551 continues to move upward, the pressure bar 1550 moves on the slope of the interlocking platform 1532, the pressure bar 1550 pulls the constraint ring 1548 and the constraint post 1552 to move, the constraint post 1552 moves on the displacement platform 1551, the constraint ring 1548 squeezes the elastic element 1553 to shorten, and after the constraint cavity on the constraint platform 1549 and the constraint ring 1548 separates, the disc 1533 and the disc 1530 engage.

[0032] The rotating rod of motor 4 1528 rotates in the forward direction, driving the traction rod 1538 to rotate. The traction rod 1538 then drives the traction plate 1539 and the traction cylinder 1540 to rotate. The slope of another row of traction platforms 1542 on the traction cylinder 1540 is in contact with the opening on the rotating ring 1546. During the rotation of the traction cylinder 1540, the elasticity of the elastic element 3 1544 cannot drive the rotating ring 1546 to rotate. The opening on the rotating ring 1546 allows the sliding rod 1543 on the traction platform 1542 to slide on the traction cylinder 1540. The traction platform 1542 compresses and shortens the elastic element 3 1544, thus preventing the traction platform 1542 from driving the rotating ring 1546 to rotate. The parallel edge of a row of traction platforms 1542 on the traction cylinder 1540 is in contact with the opening on the rotating ring 1541. During the rotation of the traction cylinder 1540, the traction platform 1542... 42. The traction rotating ring 1541 and umbrella plate 5 1537 rotate. Umbrella plate 5 1537 traction umbrella plate 3 1531 rotates. Umbrella plate 3 1531 traction plate body 2 1530 rotates. Plate body 2 1530 traction plate body 4 1533 rotates. Plate body 4 1533 traction changing rod 1547 and sliding rod 1543 rotate, so that the constraint platform 1549 on the changing rod 1547 rotates to a position that matches another constraint cavity on the constraint ring 1548, thus changing the mold surface. This allows the laser head to process the four vertically circular side walls. During the processing of the locked and fitted surfaces, the mold is placed on the circular plate 158, and motor 3 1526 runs. Motor 3 1526 traction the circular plate 158 to rotate, so that the circular plate 158 traction the mold to rotate a quarter turn. Then, the mold surface can be changed again for subsequent laser repair processing.

[0033] After the mold processing is completed, the mold is moved to a higher position via the face-changing module. At this time, tools such as a forklift can be used to lift and remove the mold from the bottom. The above describes and illustrates the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A laser welding machine for mold repair, comprising a protective cover, characterized in that, The top of the protective cover is equipped with an electric actuator, the power end of the electric actuator is equipped with a displacement module, the displacement module is equipped with a displacement module, and the bottom of the protective cover is equipped with a face-changing module. The face-changing module includes a support platform, on which a ring-shaped piece is rotatably mounted. A constraint module and a constraint part one are mounted on the support platform. A constraint piece is mounted on the constraint module. The constraint part one is used to pull the constraint piece to lock the mold. The constraint module is used to constrain the mold. The constraint module is equipped with a traction module, a high-low displacement module and a face-changing surface. The traction module is used to pull the adapted high-low displacement module and face-changing surface to slide, so that the high-low displacement module initially pulls the constraint piece to move to a higher position, and then the face-changing surface pulls the constraint piece to rotate and change the face. The traction module includes a motor, a traction rod, a traction plate, a traction cylinder, a traction platform, sliding bars, and an elastic element. The traction rod is fixedly connected to the traction plate, and the traction plate is fixedly connected to the traction cylinder. The traction cylinder has two rows of sliding bars arranged in a ring. Each row of sliding bars has several sliding bars, which are evenly spaced. The sliding bars are slidably mounted on the side wall of the traction cylinder. An elastic element is installed on each sliding bar, and one side of the elastic element is fixedly connected to the traction platform. The traction platforms on the two rows of sliding bars face away from each other. The high and low displacement module includes a support frame, a threaded rod, a support column, an assembly base, a second rotating ring, a face-changing rod, and a displacement platform. The second rotating ring has several openings at equal intervals. The second rotating ring is rotatably mounted on the support frame. The openings on the second rotating ring are plugged into and connected to one row of traction platforms. The second rotating ring is fixedly connected to the assembly base. The assembly base is fixedly connected to the threaded rod. The threaded rod is rotatably mounted on the support column. The displacement platform is mounted on the threaded rod. The displacement platform is threadedly connected to the threaded rod. The face-changing rod is rotatably connected to the displacement platform. The face-changing rod is fixedly connected to the constraint plate. The high and low displacement module is equipped with a second constraint part, which is used to constrain the rotation of the face-changing rod. The second constraint part includes a connecting platform, a constraint ring, a constraint platform, a pressure bar, a displacement platform, and a constraint column. The constraint column is slidably mounted on the displacement platform. An elastic element four is mounted on the constraint column. The constraint ring is fixedly connected to the constraint column. The constraint cavity of the constraint ring is inserted and connected to the constraint platform. The constraint platform is fixedly connected to the face bar. The pressure bar is fixedly connected to the constraint ring. The pressure bar is fitted and connected to the connecting platform. The connecting platform is fixedly connected to the support frame. The face-changing device includes a second disc, a third umbrella disc, a fourth disc, a fifth umbrella disc, and a first rotating ring. The first rotating ring has several openings at equal intervals. The openings on the first rotating ring are connected to the traction table. The first rotating ring is fixedly connected to the fifth umbrella disc. The first rotating ring is rotatably mounted on the support frame. The fifth umbrella disc is engaged with the third umbrella disc. The third umbrella disc and the second disc are mounted on the same rod. The second disc is rotatably connected to the locking frame. The second disc is engaged with the fourth disc. The fourth disc is fixedly connected to the face-changing rod.

2. The laser welding machine for mold repair according to claim 1, characterized in that: The lower walls of the four corners of the support platform are supported by column legs.

3. The laser welding machine for mold repair according to claim 1, characterized in that: The constraint module includes a guide bar, a connecting piece, a locking frame, a plate, a disc, a motor, and an assembly frame. A pair of locking frames are mirror-mounted, and each locking frame has a displacement hole. The constraint pieces slide and connect on the displacement holes of the locking frames. The locking frames are slidably mounted on the support platform. A pair of plates and a pair of connecting pieces are mounted. The plates and connecting pieces are fixedly connected. One plate is connected to one of the connecting pieces, and the other plate is connected to the other connecting piece. A pair of plates are mounted on both sides of the disc, and the disc is engaged with the plates.

4. The laser welding machine for mold repair according to claim 1, characterized in that: The first constraint part includes a second electric actuator, a bending plate, a displacement bar, a first elastic element, and a stop platform. A pair of stop platforms are mirror-mounted. The stop platforms are fixed to the displacement bar. The displacement bar is slidably mounted on the bending plate. The bending plate is fixedly connected to the power end of the second electric actuator.

5. A laser welding machine for mold repair according to claim 1, characterized in that: The first displacement module includes an assembly frame, a threaded rod, a motor, and a threaded connector. The assembly frame is connected to the power end of the electric actuator. The first motor is installed on one side of the assembly frame. The rotating rod of the first motor is fixedly connected to the threaded rod, which is rotatably connected to the assembly frame. The threaded rod is threadedly connected to the threaded connector. The second displacement module has the same structure as the first displacement module. The second displacement module is equipped with a laser welding head.

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