Welding device for steel plate box shell of refrigerator

Abstract

The invention discloses a refrigerator steel plate box shell welding device, and relates to the technical field of refrigerator steel plate box shell welding, the refrigerator steel plate box shell welding device comprises a base and steel plate parts, the top of the base is provided with a right-angle frame, the two steel plate parts are placed on the right-angle frame, and a welding assembly for welding the two steel plate parts is arranged above the right-angle frame; supporting seats fixedly mounted on the base are arranged on the two sides of the right-angle frame, a mounting frame is fixedly mounted on the tops of the supporting seats, and a control assembly for stabilizing the steel plate piece is arranged on the mounting frame. According to the welding device for the refrigerator steel plate box shell, a second air cylinder drives a connecting plate, a pressing plate and other components to move synchronously, precise pushing of two to-be-welded steel plate pieces is achieved, it is guaranteed that the to-be-welded ends of the to-be-welded steel plate pieces can be tightly attached through the pushing action, a welding gap is effectively eliminated, and therefore the subsequent welding effect is guaranteed, and the welding efficiency is improved. By means of the design, the sealing performance and strength of welding are improved, and the service life of the welding structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of steel plate box shell welding for refrigerators, in particular to a welding device for a steel plate box shell for refrigerators. Background Art

[0002] In the refrigeration industry, the steel plate shell of the refrigerator is the main structural component of the refrigerator. Its welding quality and precision have an important impact on the thermal insulation performance, sealing and overall structural strength of the refrigerator. During the operation, the traditional refrigerator steel plate shell welding device often relies on manual or relatively simple mechanical structures to achieve the positioning and welding of steel plates. Although these existing technologies can meet production needs to a certain extent, they have many shortcomings.

[0003] In the prior art, the welding of the steel plate shell of the refrigerator is usually done by manually holding the steel plate to align the steel plate, and then welding is performed through welding equipment. This method is not only inefficient, but also difficult to ensure the alignment accuracy, which can easily lead to excessive welding gaps or misalignment of the steel plate, thereby affecting the welding quality and the overall performance of the refrigerator. In addition, manual operation also has safety hazards, such as the risk of burns or fire caused by welding sparks. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a welding device for a steel plate box shell of a refrigerator, which solves the technical problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a welding device for a steel plate box shell of a refrigerator, comprising a base and a steel plate member, a right angle frame is arranged on the top of the base, and two steel plates are placed on the right angle frame, a welding assembly for welding the two steel plates is arranged above the right angle frame, support seats fixedly installed on the base are arranged on both sides of the right angle frame, a mounting frame is fixedly installed on the top of the support seat, and a control assembly for stabilizing the steel plate member is arranged on the mounting frame;

[0006] The top of the support seat is fixedly connected with a fixing frame, the inner end of the support seat is slidably connected with a lifting plate in the vertical direction, and the inner end of the lifting plate is provided with a mounting groove;

[0007] The control component includes a pressure plate, a first cylinder is arranged on the top of the pressure plate, the first cylinder is fixedly mounted on the mounting frame, guide rods are arranged on both sides of the bottom end of the pressure plate for rotation through torsion springs, a U-shaped frame is arranged below the guide rods and is fixedly mounted on the top of the support seat, a control plate is slidably connected to the U-shaped frame, and a pressing plate for fixing the position of the steel plate is arranged on the inner end of the control plate.

[0008] As a further preferred embodiment of the present technical solution, a driving groove is provided on the surface of the control panel, and the position of the driving groove corresponds to the position of the guide rod, a trapezoidal block fixedly mounted on the U-shaped frame is provided below the control panel, a fixed rod is fixedly connected to one side of the trapezoidal block, a slide plate is provided at the bottom of the control panel, and the slide plate is slidably mounted on the fixed rod, and a first damping spring mounted on the fixed rod is provided between the slide plate and the trapezoidal block.

[0009] As a further preferred embodiment of the present technical solution, a slide groove is provided at the outer end of the pressing plate, a slider is slidably connected in the slide groove, and one end of the slider is fixedly connected to the control board, and a plurality of protrusions are provided at the inner end of the pressing plate.

[0010] As a further preferred embodiment of the present technical solution, a second cylinder is provided on one side of the top of the control board, a connecting plate is provided on the output end of the control board, and the connecting plate is connected to the pressing plate.

[0011] As a further optimization of the technical solution, both ends of the pressure plate are threadedly connected to limit rods, the limit rods are located at the outer ends of the guide rods, and the guide rods are pushed to rotate toward the limit rod side under the elastic force of the torsion spring.

[0012] As a further preferred embodiment of the present technical solution, support frames are fixedly connected to both sides of the top of the support seat, a vertical rod is fixedly connected to the top of the support frame, a sliding plate is slidably connected to the vertical rod, a pressure plate is fixedly connected at one end of the sliding plate, a connecting rod is rotatably connected to the other end of the sliding plate, a push plate is rotatably connected to the other end of the connecting rod, the push plate is slidably installed on the support frame, and a second damping spring mounted on the vertical rod is arranged between the sliding plate and the support frame.

[0013] As a further preferred embodiment of the present technical solution, support frames are fixedly connected to both sides of the top of the support seat, a vertical rod is fixedly connected to the top of the support frame, a sliding plate is slidably connected to the vertical rod, a pressure plate is fixedly connected at one end of the sliding plate, a connecting rod is rotatably connected to the other end of the sliding plate, a push plate is rotatably connected to the other end of the connecting rod, the push plate is slidably installed on the support frame, and a second damping spring mounted on the vertical rod is arranged between the sliding plate and the support frame.

[0014] As a further preferred embodiment of the present technical solution, the welding assembly includes sliding rods fixedly mounted on both sides of the mounting frame, a movable plate is slidably connected to the sliding rods, a third cylinder fixedly mounted on the mounting frame is provided on the top of the movable plate, an electric slide rail is provided at the bottom of the movable plate, a slide seat is slidably connected to the electric slide rail, and a welding gun is provided at the bottom of the slide seat.

[0015] Compared with the prior art, it has the following beneficial effects:

[0016] By accurately embedding the steel plates into the inner mounting grooves and using the cylinder to drive the coordinated movement of the pressure plate with the guide rod, control plate and other components, precise positioning and pressing of the steel plates are achieved. This process not only ensures the stability of the steel plates before welding, but also significantly improves the positioning accuracy of the overall device. Through automated pressing and positioning processing, the preparation time before welding is greatly shortened and work efficiency is improved. At the same time, this design also ensures that the steel plates will not affect the welding quality due to position offset during the welding process, thereby further improving the accuracy and efficiency of welding. The ingenious design of the sliding plate, connecting rod, push plate and other components enables the steel plates to be accurately centered before welding, ensuring the accuracy of the welding position. This step lays a solid foundation for subsequent welding operations and improves the welding yield and consistency.

[0017] Through the innovative design of the first gear rod, gear, second gear rod and other transmission components, the upward and centered movement of the steel plate on the right-angle frame is realized. This design not only simplifies the positioning process, but also improves the accuracy and efficiency of positioning, creating more favorable conditions for subsequent welding processing; through the second cylinder driving the synchronous movement of the connecting plate, pressing plate and other components, the precise pushing of the two steel plates to be welded is achieved. This pushing action ensures that the ends of the steel plates to be welded can fit tightly, effectively eliminating the welding gap, thereby ensuring the subsequent welding effect. This design not only improves the sealing and strength of the welding, but also extends the service life of the welded structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the welding assembly in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the support seat, the lifting plate, the pressing plate, the U-shaped frame and the pressing plate in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the pressing plate, the control plate, the U-shaped frame and the guide rod in the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the pressing plate, the control plate, the trapezoidal block, the protrusion, the second cylinder and the connecting plate in the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the pressure plate, the guide rod and the limit rod in the present invention;

[0024] Figure 7 It is a structural schematic diagram of the sliding board, the linkage rod and the pushing board in the present invention;

[0025] Figure 8 It is a schematic structural diagram of the pressure plate, the first gear rod, the gear, the second gear rod and the lifting plate in the present invention.

[0026] In the figure: 1, base; 2, right angle frame; 3, steel plate; 4, support seat; 5, mounting frame; 6, control assembly; 7, welding assembly; 41, fixing frame; 42, lifting plate; 43, mounting groove; 61, pressing plate; 62, first cylinder; 63, U-shaped frame; 64, control board; 65, driving groove; 66, guide rod; 67, pressing plate; 68, trapezoidal block; 69, fixing rod; 610, first damping spring; 611, slide groove; 612, Slider; 613, bump; 614, second cylinder; 615, connecting plate; 616, limit rod; 617, support frame; 618, push plate; 619, vertical rod; 620, slide plate; 621, connecting rod; 622, second damping spring; 623, first gear rod; 624, gear; 625, second gear rod; 71, slide rod; 72, moving plate; 73, third cylinder; 74, electric slide rail; 75, slide seat; 76, welding gun. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings of the specification. 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 work are within the scope of protection of the present invention.

[0028] Embodiment 1: Combination Figure 1-Figure 8 As shown, the present invention provides a technical solution: a welding device for a steel plate box shell of a refrigerator, comprising a base 1 and a steel plate member 3, a right angle frame 2 is arranged on the top of the base 1, and two steel plates 3 are placed on the right angle frame 2, a welding assembly 7 for welding the two steel plates 3 is arranged above the right angle frame 2, and support seats 4 fixedly mounted on the base 1 are arranged on both sides of the right angle frame 2, the support seat 4 is designed to be a solid structure, a mounting frame 5 is fixedly mounted on the top, and a control assembly 6 for stabilizing the steel plate member 3 is arranged on the mounting frame 5, and the top of the support seat 4 is connected through a fixing frame 41 to ensure its stability;

[0029] The inner end of the support seat 4 is slidably connected with a lifting plate 42 in the vertical direction. The inner end of the lifting plate 42 is provided with a mounting groove 43 so that the bottom of the steel plate 3 can be placed therein. When the lifting plate 42 moves up and down, it can drive the steel plate 3 to move up and down accordingly, thereby adjusting the positions of the two steel plates 3 according to welding requirements;

[0030] The control assembly 6 includes a pressing plate 61, a first cylinder 62 is provided on the top of the pressing plate 61, and the first cylinder 62 is fixedly mounted on the mounting frame 5 to ensure its stability and precise control. Guide rods 66 are provided on both sides of the bottom end of the pressing plate 61 through torsion spring rotation. The elastic force of the torsion spring pushes the guide rods 66 to rotate outward to ensure its flexibility and response speed. A U-shaped frame 63 fixedly mounted on the top of the support seat 4 is provided below the guide rod 66. A control plate 64 is slidably connected to the U-shaped frame 63. A pressing plate 67 for fixing the position of the steel plate 3 is provided on the inner side end of the control plate 64. When the first cylinder 62 is turned on, it will drive the pressing plate 61 and the guide rod 66 to move downward, so that the guide rod 66 pushes the control plate 64 to move inward, and then drives the pressing plate 67 to move inward, thereby pressing and positioning the steel plate 3 located on both sides of the right-angle frame 2 for subsequent welding.

[0031] A driving groove 65 is provided on the surface of the control plate 64, and the position of the driving groove 65 corresponds to the position of the guide rod 66. When the guide rod 66 moves downward, the end of the guide rod 66 moves into the driving groove 65. A trapezoidal block 68 fixedly installed on the U-shaped frame 63 is provided below the control plate 64. The guide rod 66 moves downward into the driving groove 65 and contacts the inclined surface of the trapezoidal block 68. Under the action of the trapezoidal block 68, the guide rod 66 rotates inward and pushes the control plate 64 and the pressing plate 67 to move inward, so as to perform a pressing and positioning process on the steel plate 3. A fixing rod 69 is fixedly connected to one side of the trapezoidal block 68. A slide plate is provided at the bottom of the control plate 64, and the slide plate is slidably installed on the fixing rod 69. A first damping spring 610 sleeved on the fixing rod 69 is provided between the slide plate and the trapezoidal block 68. The elastic force of the first damping spring 610 pushes the slide plate, the control plate 64, and the pressing plate 67 to move outward and reset, so as to facilitate the next welding process.

[0032] A slide groove 611 is provided at the outer end of the pressing plate 67, a slider 612 is slidably connected in the slide groove 611, one end of the slider 612 is fixedly connected to the control plate 64 to ensure synchronous movement, and a plurality of protrusions 613 are provided at the inner end of the pressing plate 67, which can increase the contact area with the steel plate 3, thereby improving the accuracy of pressing positioning;

[0033] A second cylinder 614 is provided on one side of the top of the control board 64, and the second cylinder 614 is in a parallel state with the support frame 617. A connecting plate 615 is provided at the output end of the control board 64, and the connecting plate 615 is connected to the pressing plate 67. By turning on the second cylinder 614, the connecting plate 615 is driven to move upwards obliquely, and then the connecting plate 615 drives the pressing plate 67 to move upwards obliquely. The pressing plate 67 cooperates with the protrusion 613 to push the two steel plates 3 to be welded toward the welding position during the clamping process, so that the ends to be welded of the two steel plates 3 to be welded are closely fitted to ensure the subsequent welding effect;

[0034] The two ends of the pressure plate 61 are threadedly connected to the limit rod 616, and the limit rod 616 is located at the outer end of the guide rod 66. The guide rod 66 pushes the guide rod 66 to rotate toward the limit rod 616 under the elastic force of the torsion spring. The position of the limit rod 616 is adjusted by rotating the limit rod 616, thereby changing the initial position of the guide rod 66. The change in the initial position of the guide rod 66 changes the moving distance of the guide rod 66 pushing the control plate 64, thereby being able to push the steel plates 3 of different specifications for subsequent welding processing;

[0035] The top of the support seat 4 is fixedly connected with a support frame 617 on both sides, and the top of the support frame 617 is fixedly connected with a vertical rod 619, and a sliding plate 620 is slidably connected to the vertical rod 619. One end of the sliding plate 620 is fixedly connected to the pressure plate 61, and the other end is rotatably connected to a connecting rod 621. The other end of the connecting rod 621 is rotatably connected to a pushing plate 618, and the pushing plate 618 is slidably installed on the support frame 617. A second damping spring 622 sleeved on the vertical rod 619 is arranged between the sliding plate 620 and the support frame 617. When the pressure plate 61 moves downward, it drives the sliding plate 620 to move downward and compresses the second damping spring 622. When the sliding plate 620 moves downward, it drives the connecting rod 621 to move, so that the connecting rod 621 pushes the pushing plate 618 to move inward, so that the inclined surface of the pushing plate 618 pushes the steel plate 3 to be located on the right-angle frame 2 for centering, so as to facilitate the subsequent welding process;

[0036] The first gear rod 623 is fixedly connected to both sides of the bottom of the pressure plate 61, one side of the first gear rod 623 is meshedly connected to a gear 624 rotatably mounted on the fixed frame 41, and the other side of the gear 624 is meshedly connected to a second gear rod 625, the bottom end of the second gear rod 625 is fixedly connected to the lifting plate 42, and a sliding groove for the first gear rod 623 and the second gear rod 625 to move is provided on the fixed frame 41. When the pressure plate 61 moves downward, it drives the first gear rod 623 to move downward, so that the first gear rod 623 drives the gear 624 to rotate, and the gear 624 drives the second gear rod 625 to move upward, so that the second gear rod 625 drives the lifting plate 42 to move upward, and then the lifting plate 42 drives the steel plate 3 located on the right-angle frame 2 to move upward and in the center for subsequent welding processing.

[0037] In the embodiment of the present invention, the steel plate 3 to be welded is placed on both sides of the right-angle frame 2, and the bottom end of the steel plate 3 is accurately embedded in the inner mounting groove 43. This design not only ensures the stability of the steel plate 3, but also improves the positioning accuracy of the overall device. By turning on the first cylinder 62, the pressing plate 61 and the guide rod 66 are driven to move downward in a coordinated manner. The guide rod 66 cleverly uses the guidance of the driving groove 65 to push the control plate 64 to move accurately inward. The control plate 64 then drives the pressing plate 67 to fit the steel plate 3 tightly inward, thereby realizing the pressing and positioning processing of the steel plate 3. This process not only improves the preparation efficiency before welding, but also ensures that the steel plate 3 will not affect the welding quality due to position offset during the welding process, thereby significantly improving the welding accuracy and efficiency.

[0038] At the same time, the downward movement of the pressure plate 61 also triggers the synchronous descent of the sliding plate 620. In this process, the second damping spring 622 is effectively compressed, which plays a role of buffering and stabilization. The descent of the sliding plate 620 drives the smooth movement of the linkage rod 621, thereby pushing the push plate 618 to move inward. The inclined surface of the push plate 618 cleverly contacts the steel plate 3, pushing it to be accurately centered on the right-angle frame 2. This step further ensures that the position of the steel plate 3 before welding is accurate, lays a solid foundation for subsequent welding operations, and improves the welding yield and consistency.

[0039] In addition, the descent of the pressing plate 61 also drives the synchronous movement of the first gear rod 623. Through the transmission of the gear 624, the second gear rod 625 is driven to move upward. This motion chain finally drives the lifting plate 42 to move upward, driving the steel plate 3 to move upward and centered on the right-angle frame 2. This innovative design not only simplifies the positioning process of the steel plate 3, but also improves the accuracy and efficiency of positioning, creating more favorable conditions for subsequent welding processing.

[0040] Finally, by turning on the second cylinder 614, the connecting plate 615 drives the synchronous movement of the pressing plate 67 in the inclined upward movement. The pressing plate 67 and the protrusion 613 work closely together, and the two steel plates 3 to be welded are accurately pushed toward the welding point during the clamping process. This pushing action ensures that the ends of the steel plates 3 to be welded can fit tightly, effectively eliminating the welding gap, thereby ensuring the subsequent welding effect. This design not only improves the sealing and strength of the welding, but also extends the service life of the welding structure, bringing users a more reliable and high-quality welding experience.

[0041] Embodiment 2: Combination Figure 2As shown, on the basis of the first embodiment, the welding assembly 7 includes slide bars 71 fixedly mounted on both sides of the mounting frame 5, and these slide bars 71 have smooth surfaces, which can ensure that the moving plate 72 slidably connected thereon can move smoothly, and a third cylinder 73 fixedly mounted on the mounting frame 5 is provided on the top of the moving plate 72, and this cylinder 73 can provide precise power control, so that the moving plate 72 can be accurately positioned and moved on the slide bars 71;

[0042] In addition, an electric slide rail 74 is set at the bottom of the movable plate 72. The slide rail 74 can provide stable sliding support to ensure that the slide seat 75 can slide smoothly thereon. A welding gun 76 is set at the bottom of the slide seat 75. The welding gun 76 is the core component of the entire welding assembly. It can perform precise welding operations under the coordinated action of the movable plate 72 and the electric slide rail 74. Through this design, the welding assembly 7 can realize efficient and precise welding operations, greatly improving production efficiency and welding quality.

[0043] In the embodiment of the present invention, during the welding operation, when it is necessary to weld two steel plates 3, the third cylinder 73 needs to be started first. The start of the third cylinder 73 will drive the movable plate 72 to move downward along the slide rod 71. As the movable plate 72 descends, it will drive the electric slide rail 74, the slide seat 75 and the welding gun 76 to move downward together. This series of linkage actions ensures that the welding gun 76 can accurately move to the predetermined welding position. After reaching the specified position, the welding gun 76 starts to weld the two steel plates 3. After the welding is completed, in order to ensure the welding quality, it is necessary to perform multi-position welding on the connection between the two steel plates 3. At this time, the electric slide rail 74 plays a role again, driving the slide seat 75 and the welding gun 76 to move along the predetermined trajectory. In this way, the welding gun 76 can perform detailed welding on different positions of the connection, thereby ensuring the integrity and strength of the welded joint. The entire process is achieved through precise mechanical linkage and control, and efficient and high-quality welding operations are achieved.

[0044] Working principle of the welding device for the steel plate shell of the refrigerator:

[0045] Step 1: Place the steel plates 3 to be welded on both sides of the right-angle frame 2, and place the bottom ends of the steel plates 3 in the inner mounting grooves 43. Turn on the first cylinder 62 to drive the pressing plate 61 and the guide rod 66 to move downward, so that the guide rod 66 cooperates with the driving groove 65 to push the control plate 64 to move inward, so that the control plate 64 drives the pressing plate 67 to move inward, so that when the pressing plate 67 moves inward, the steel plates 3 on both sides of the right-angle frame 2 are pressed and positioned, so as to facilitate the subsequent welding process;

[0046] At the same time, the pressing plate 61 moves downward, driving the sliding plate 620 to move downward, and compressing the second damping spring 622. When the sliding plate 620 moves downward, it drives the linkage rod 621 to move, so that the linkage rod 621 pushes the pushing plate 618 to move inward, so that the inclined surface of the pushing plate 618 pushes the steel plate 3 to be located on the right-angle frame 2 for centering, thereby facilitating subsequent welding processing;

[0047] When the pressing plate 61 moves downward, the first gear rod 623 is driven to move downward, so that the first gear rod 623 drives the gear 624 to rotate, so that the gear 624 drives the second gear rod 625 to move upward, so that the second gear rod 625 drives the lifting plate 42 to move upward, so that the lifting plate 42 drives the steel plate 3 located on the right angle frame 2 to move upward and in the center, so as to facilitate the subsequent welding process;

[0048] Step 2: Turn on the second cylinder 614 to drive the connecting plate 615 to move upwards, and then the connecting plate 615 drives the pressing plate 67 to move upwards, so that the pressing plate 67 cooperates with the protrusion 613 to push the two steel plates 3 to be welded toward the welding position during the clamping process, so that the ends of the two steel plates 3 to be welded are closely fitted to ensure the subsequent welding effect;

[0049] Step three, turn on the third cylinder 73 to drive the movable plate 72 on the slide rod 71 to move downward, so that the movable plate 72 drives the electric slide rail 74, the slide seat 75 and the welding gun 76 to move downward, so that the welding gun 76 moves to the welding position, and uses the welding gun 76 to weld the two steel plates 3, and then uses the electric slide rail 74 to drive the slide seat 75 and the welding gun 76 to move, so that the welding gun 76 welds the two steel plates 3 at different positions at the connection.

[0050] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for a steel plate box shell of a refrigerator, comprising a base (1) and a steel plate member (3), characterized in that: A right angle frame (2) is arranged on the top of the base (1), and two steel plates (3) are placed on the right angle frame (2); a welding assembly (7) for welding the two steel plates (3) is arranged above the right angle frame (2); support seats (4) fixedly mounted on the base (1) are arranged on both sides of the right angle frame (2); a mounting frame (5) is fixedly mounted on the top of the support seat (4); and a control assembly (6) for stabilizing the steel plates (3) is arranged on the mounting frame (5); The top of the support seat (4) is fixedly connected to a fixing frame (41), the inner end of the support seat (4) is slidably connected to a lifting plate (42) in a vertical direction, and the inner end of the lifting plate (42) is provided with a mounting groove (43); The control assembly (6) comprises a pressing plate (61), a first cylinder (62) is arranged on the top of the pressing plate (61), the first cylinder (62) is fixedly mounted on the mounting frame (5), guide rods (66) are arranged on both sides of the bottom end of the pressing plate (61) for rotation via torsion springs, a U-shaped frame (63) is arranged below the guide rods (66) and is fixedly mounted on the top of the support seat (4), a control plate (64) is slidably connected to the U-shaped frame (63), and a pressing plate (67) for fixing the position of the steel plate member (3) is arranged at the inner side end of the control plate (64).

2. The welding device for a steel plate box shell of a refrigerator according to claim 1, characterized in that: A driving groove (65) is provided on the surface of the control plate (64), and the position of the driving groove (65) corresponds to the position of the guide rod (66). A trapezoidal block (68) fixedly mounted on the U-shaped frame (63) is provided below the control plate (64), and a fixing rod (69) is fixedly connected to one side of the trapezoidal block (68). A sliding plate is provided at the bottom of the control plate (64), and the sliding plate is slidably mounted on the fixing rod (69). A first damping spring (610) sleeved on the fixing rod (69) is provided between the sliding plate and the trapezoidal block (68).

3. The welding device for a steel plate box shell of a refrigerator according to claim 2, characterized in that: A slide groove (611) is provided at the outer end of the pressing plate (67), a slider (612) is slidably connected in the slide groove (611), and one end of the slider (612) is fixedly connected to the control plate (64), and a plurality of protrusions (613) are provided at the inner end of the pressing plate (67).

4. The welding device for a steel plate box shell of a refrigerator according to claim 3, characterized in that: A second cylinder (614) is arranged on one side of the top of the control plate (64), a connecting plate (615) is arranged at the output end of the control plate (64), and the connecting plate (615) is connected to the pressing plate (67).

5. The welding device for a steel plate box shell of a refrigerator according to claim 4, characterized in that: The two ends of the pressure plate (61) are threadedly connected to a limit rod (616), the limit rod (616) is located at the outer end of the guide rod (66), and the guide rod (66) is pushed to rotate toward one side of the limit rod (616) under the elastic force of the torsion spring.

6. The welding device for a steel plate box shell of a refrigerator according to claim 5, characterized in that: A support frame (617) is fixedly connected to both sides of the top of the support seat (4), a vertical rod (619) is fixedly connected to the top of the support frame (617), a sliding plate (620) is slidably connected to the vertical rod (619), one end of the sliding plate (620) is fixedly connected to a pressure plate (61), the other end of the sliding plate (620) is rotatably connected to a connecting rod (621), the other end of the connecting rod (621) is rotatably connected to a push plate (618), the push plate (618) is slidably mounted on the support frame (617), and a second damping spring (622) sleeved on the vertical rod (619) is arranged between the sliding plate (620) and the support frame (617).

7. The welding device for a steel plate box shell of a refrigerator according to claim 6, characterized in that: A support frame (617) is fixedly connected to both sides of the top of the support seat (4), a vertical rod (619) is fixedly connected to the top of the support frame (617), a sliding plate (620) is slidably connected to the vertical rod (619), one end of the sliding plate (620) is fixedly connected to a pressure plate (61), the other end of the sliding plate (620) is rotatably connected to a connecting rod (621), the other end of the connecting rod (621) is rotatably connected to a push plate (618), the push plate (618) is slidably mounted on the support frame (617), and a second damping spring (622) sleeved on the vertical rod (619) is arranged between the sliding plate (620) and the support frame (617).

8. The welding device for a steel plate box shell of a refrigerator according to claim 1, characterized in that: The welding assembly (7) comprises a slide bar (71) fixedly mounted on both sides of the mounting frame (5), a movable plate (72) being slidably connected to the slide bar (71), a third cylinder (73) fixedly mounted on the mounting frame (5) being arranged on the top of the movable plate (72), an electric slide rail (74) being arranged on the bottom of the movable plate (72), a slide seat (75) being slidably connected to the electric slide rail (74), and a welding gun (76) being arranged on the bottom of the slide seat (75).

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