A hot-dip plasticizing device for metal workpieces

Abstract

This invention discloses a hot-dip coating apparatus for metal workpieces, including a coating tank, a placement rack inside the tank, a mounting frame fixedly connected between the front and back sides of the tank's outer wall, a hydraulic cylinder fixedly mounted on the middle of the upper surface of the mounting frame, a suction mechanism at the top of the placement rack's inner cavity, a support mechanism at the bottom of the placement rack's inner wall, and a pressing mechanism on the upper surface of the placement rack. By moving the placement rack upwards, one end of a movable block presses against the inclined surface of an extrusion block, causing one end of both the movable and rotating blocks to rotate downwards. The rotating block drives a connecting rod to pull the movable rod to one side, causing the bottom of the movable rod to press down on the movable rack. The lower surface of the magnetic block attracts the upper surface of the metal workpiece. Utilizing the elasticity of a compression spring, the movable rack and the metal workpiece are pushed upwards, ensuring thorough coating of the bottom of the metal workpiece and improving the coating effect.

Description

Technical Field

[0001] This invention relates to the field of metal workpiece processing, and in particular to a hot-dip plastic coating apparatus for metal workpieces. Background Technology

[0002] Dip coating, also known as hot dip coating or hot-applied coating, is a common plastic coating process. Depending on the raw materials used, it can be divided into liquid dip coating and powder dip coating. Dip-coated products are widely used in various aspects of production and daily life both domestically and internationally, such as clothes hangers, pliers, scissors sleeves, and water valve wrenches. Liquid dip coating processes mostly use thermoplastic dip coating liquids. Thermoplastic coatings have the characteristics of softening upon preheating and solidifying into a film upon cooling. The process is primarily a physical melting and plasticizing film formation, making processing and production relatively simple.

[0003] When performing dip coating on common metal workpieces, the workpiece is usually placed on a rack, which then immerses the workpiece in the solution for dip coating. However, because the workpiece is placed on the rack, the lower surface of the workpiece is in contact with the surface of the rack, creating a barrier between the contact area and the dip coating solution. This makes it difficult to perform dip coating on the contact area between the lower surface of the workpiece and the rack, thus reducing the effectiveness of the dip coating process. Summary of the Invention

[0004] The purpose of this invention is to provide a hot-dip plastic coating apparatus for metal workpieces to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal workpiece hot-dip plastic coating device, comprising a plastic coating tank, a placement rack disposed in the inner cavity of the plastic coating tank, an mounting frame fixedly connected between the front and back sides of the outer wall of the plastic coating tank, a hydraulic cylinder fixedly mounted in the middle of the upper surface of the mounting frame, a suction mechanism disposed at the top of the inner cavity of the placement rack for gripping the metal workpiece, a support mechanism disposed at the bottom of the inner wall of the placement rack for supporting the lower surface of the metal workpiece, and a pressing mechanism disposed on the upper surface of the placement rack for pressing the suction mechanism downward.

[0006] Preferably, the suction mechanism includes a movable frame, the two sides of which are slidably interlocked with the top of the placement frame, a plurality of mounting rods are fixedly connected at equal intervals on the lower surface of the movable frame, a fixing block is fixedly connected to the bottom end of the mounting rod, a plurality of fixing rods are fixedly connected at equal intervals on the lower surface of the fixing block, and a magnetic block is fixedly connected to the bottom end of the fixing rod.

[0007] Preferably, the support mechanism includes multiple support blocks, which are arranged in the shape of isosceles triangles. The lower surface of the support block is fixedly connected to the bottom of the inner wall of the movable frame. Multiple placement slots are evenly spaced at the top of the multiple support blocks. A protrusion is provided at the bottom of the inner wall of the placement slot, and the top of the protrusion is chamfered.

[0008] Preferably, the pressing mechanism includes a fixed frame, the lower surface of the fixed frame is fixedly connected to the upper surface of the placement frame, fixed seats are fixedly connected to both sides of the top of the inner wall of the fixed frame, a fixed shaft is fixedly inserted through the bottom of the fixed seat, and a movable rod is rotatably inserted through the fixed shaft.

[0009] Preferably, a fixed shaft two is fixedly inserted and connected to the bottom of the movable rod, and connecting seats are rotatably inserted and connected to both ends of the fixed shaft two. A connecting groove is provided below the connecting seat, and two connecting grooves are opened on both sides of the upper surface of the movable frame. The inner cavity of the connecting groove is slidably inserted and connected to the bottom of the connecting seat. A connecting rod is provided on one side of the movable rod, and a fixed shaft three is rotatably inserted and connected to both ends of the connecting rod.

[0010] Preferably, one end of one of the fixed shafts is fixedly connected to the front of the movable rod, and movable grooves are provided on both sides of the fixed frame. An installation shaft is fixedly connected to the middle of the inner wall of the movable groove, and a rotating block is rotatably connected to the installation shaft. The front of one end of the rotating block is fixedly connected to one end of another fixed shaft.

[0011] Preferably, a connecting shaft is fixedly inserted at the other end of the rotating block, and a movable block is rotatably inserted between the two ends of the connecting shaft. A limit block is fixedly connected to the lower surface of the other end of the rotating block, and the upper surface of one end of the limit block is in contact with the lower surface of the movable block. Extrusion blocks are fixedly connected to the top of both sides of the inner wall of the dip-coating box. The top and bottom of one side of the extrusion block are inclined. A stop block is fixedly connected to the upper surface of the other end of the rotating block.

[0012] Preferably, the top of the placement rack has multiple grooves at equal intervals, and the bottom of the inner wall of the groove is fixedly connected to a compression spring, the top of the compression spring being in contact with the top of the inner wall of the movable rack.

[0013] Preferably, the output end of the hydraulic cylinder is connected to a piston rod, the bottom end of the piston rod is fixedly connected to the middle of the upper surface of the mounting frame, the mounting frame is U-shaped, the placement frame is slidably inserted into the inner cavity of the dip-coating box, and a control cabinet is fixedly installed on the upper surface of the mounting frame.

[0014] Preferably, the movable frame is arranged in a U-shape, the bottom of the inner wall of the movable frame is in contact with the top of the inner wall of the placement frame, the magnetic block is disposed above one of the support blocks, the mounting rod is disposed in the inner cavity of the placement frame, and positioning blocks are fixedly connected to both sides of the bottom of the inner wall of the placement frame.

[0015] The technical effects and advantages of this invention are as follows:

[0016] (1) The present invention utilizes a combination of movable block, rotating block, extrusion block, connecting rod, movable rod, movable frame, compression spring, and magnetic block. By moving the placement frame upward, one end of the movable block is pressed against the inclined surface of the extrusion block, causing one end of the movable block and rotating block to rotate downward. The other end of the rotating block drives one end of the connecting rod to move upward, and the other end of the connecting rod pulls the movable rod to one side to rotate. The bottom of the movable rod presses down on the movable frame, causing the movable frame to move down together with multiple magnetic blocks. The lower surface of the magnetic blocks attracts the upper surface of the metal workpiece. Utilizing the elasticity of the compression spring, the movable frame and the metal workpiece are pushed upward, ensuring that the bottom of the metal workpiece is fully dipped in plastic, thus improving the dip-plastic effect of the metal workpiece.

[0017] (2) The present invention utilizes a combination of movable block, rotating block and limiting block to move the fixed frame upward together through the placement frame, thereby causing the upper surface of the metal workpiece to separate from the dip coating solution, and causing one end of the movable block to press against the inclined surface of the extrusion block. The limiting block limits the lower surface of the movable block, so that the rotating block rotates around the mounting shaft. When the placement frame moves downward, it causes the movable block to move above the extrusion block. The extrusion movable block rotates upward around the connecting shaft to prevent obstruction of the downward movement of the placement frame and ensure the normal use of the placement frame.

[0018] (3) The present invention utilizes a combination of support blocks, placement grooves and protrusions. By placing the metal workpiece between multiple support blocks, the metal workpiece is positioned in the inner cavity of the placement groove, which limits the position of the metal workpiece. The lower surface of the metal workpiece is in contact with the top of the protrusion, reducing the contact area of ​​the lower surface of the metal workpiece and improving the dip coating effect on the lower surface of the metal workpiece. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a front cross-sectional view of the dip-coating box of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the placement rack of the present invention.

[0022] Figure 4 This is a front cross-sectional view of the movable frame of the present invention.

[0023] Figure 5 For the present invention Figure 3 A magnified structural diagram at point A.

[0024] Figure 6 For the present invention Figure 3 A magnified structural diagram at point B.

[0025] Figure 7 This is a schematic diagram of the front structure of the active block of the present invention.

[0026] In the diagram: 1. Dipping box; 2. Placement rack; 3. Mounting rack; 4. Hydraulic cylinder; 5. Suction mechanism; 51. Movable frame; 52. Mounting rod; 53. Fixing block; 54. Fixing rod; 55. Magnetic block; 6. Support mechanism; 61. Support block; 62. Placement groove; 63. Protrusion; 7. Pressing mechanism; 71. Fixing frame; 72. Fixing seat; 73. Movable rod; 74. Connecting seat; 75. Connecting groove; 76. Connecting rod; 77. Movable groove; 78. Rotating block; 79. Movable block; 710. Limiting block; 711. Extrusion block; 712. Stop block; 713. Groove; 714. Compression spring; 8. Positioning block. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides, for example Figure 1-7The device shown includes a hot-dip coating apparatus for metal workpieces, comprising a coating tank 1, the bottom of which is filled with a coating solution. Metal workpieces are immersed in the solution for coating treatment. A placement rack 2 is provided inside the coating tank 1. Multiple metal workpieces are placed into the placement rack 2, which in turn moves the workpieces into the coating tank 1. A mounting frame 3 is fixedly connected between the front and back sides of the outer wall of the coating tank 1. The mounting frame 3 is used to mount a hydraulic cylinder 4 and a control cabinet. The hydraulic cylinder 4 is fixedly mounted in the middle of the upper surface of the mounting frame 3. The hydraulic cylinder 4 is electrically connected to an external power source via an external switch. The hydraulic cylinder 4 drives the placement rack 2 to move vertically within the coating tank 1. The placement rack 2 is movable, facilitating the loading and unloading of metal workpieces within its inner cavity. A suction mechanism 5 is located at the top of the inner cavity of the placement rack 2, used to grip the metal workpiece. The suction mechanism 5 grips the upper surface of the metal workpiece, lifting it upwards, facilitating complete dip coating of the lower surface. A support mechanism 6 is located at the bottom of the inner wall of the placement rack 2, used to support the lower surface of the metal workpiece. The support mechanism 6 reduces the contact area of ​​the metal workpiece, increasing the dip coating area. A pressing mechanism 7 is located on the upper surface of the placement rack 2, used to press the suction mechanism 5 downwards, facilitating the downward gripping of the upper surface of the metal workpiece.

[0029] The suction mechanism 5 includes a movable frame 51, which drives the fixed rod 54 and the magnetic block 55 to move vertically. The movable frame 51 slides vertically on the top of the placement frame 2. The two sides of the movable frame 51 are slidably interlocked with the top of the placement frame 2. Multiple mounting rods 52 are fixedly connected at equal intervals on the lower surface of the movable frame 51. The mounting rods 52 are used to connect the fixed block 53 and the movable frame 51, so that the fixed block 53 and the mounting rods 52 move together with the movable frame 51. The bottom end of the mounting rod 52 is fixedly connected to the fixed block 53. Block 53 is elongated and used to install fixing rods 54. Multiple fixing rods 54 are fixedly connected at equal intervals on the lower surface of fixing block 53. The fixing rods 54 are used to install magnetic blocks 55 and drive the magnetic blocks 55 to move in the vertical direction. The bottom end of the fixing rod 54 is fixedly connected to the magnetic block 55. The movable frame 51 drives the fixing rod 54 and the magnetic block 55 to move downward together, so that the lower surface of the magnetic block 55 attracts the upper surface of the metal workpiece, thereby driving the metal workpiece to move upward, which facilitates the dip coating of the lower surface of the metal workpiece.

[0030] The support mechanism 6 includes multiple support blocks 61, which support the lower surface of the metal workpiece and reduce the contact area between the lower surface of the metal workpiece and the top of the support block 61. The support blocks 61 are arranged in the shape of isosceles triangles. The lower surface of the support blocks 61 is fixedly connected to the bottom of the inner wall of the movable frame 51. Multiple placement slots 62 are evenly and equidistantly opened on the top of the multiple support blocks 61. By placing the metal workpiece in the inner cavity of the placement slot 62, the front and back of the metal workpiece are limited. The other multiple support blocks 61 are used to limit the sides of the metal workpiece to ensure the stability of the metal workpiece. The bottom of the inner wall of the placement slot 62 is provided with a protrusion 63. The top of the protrusion 63 contacts the lower surface of the metal workpiece to reduce the contact area and improve the integrity of the metal workpiece dip coating. The top of the protrusion 63 is chamfered.

[0031] The pressing mechanism 7 includes a fixed frame 71, which is U-shaped and used to install the movable frame 51. The lower surface of the fixed frame 71 is fixedly connected to the upper surface of the placement frame 2. The fixed frame 71 moves together with the placement frame 2. Fixed seats 72 are fixedly connected to both sides of the top of the inner wall of the fixed frame 71. The fixed seats 72 are used to install the movable rod 73. A fixed shaft is fixedly inserted through the bottom of the fixed seat 72. The movable rod 73 is rotatably inserted through the fixed shaft. The movable rod 73 is located above the movable frame 51. The top of the movable rod 73 rotates around the fixed shaft.

[0032] A fixed shaft 2 is fixedly inserted into the bottom of the movable rod 73. The fixed shaft 2 is used to install the connecting seat 74. The two ends of the fixed shaft 2 are rotatably inserted into the connecting seat 74. The connecting seat 74 rotates around the fixed shaft 2 to connect the movable rod 73 and the movable frame 51. The bottom of the connecting seat 74 is T-shaped. A connecting groove 75 is provided below the connecting seat 74. Two connecting grooves 75 are opened on both sides of the upper surface of the movable frame 51. The connecting grooves 75 are T-shaped. The inner cavity of the connecting groove 75 is slidably inserted into the bottom of the connecting seat 74. The seat 74 is movably engaged with the inner cavity of the connecting groove 75, allowing the connecting seat 74 to slide within the inner cavity of the connecting groove 75. As the movable rod 73 rotates, it drives the bottom connecting seat 74 to slide within the inner cavity of the connecting groove 75, and presses against the movable frame 51, causing the movable frame 51 to move vertically. A connecting rod 76 is provided on one side of the movable rod 73, which is used to connect the movable rod 73 and the rotating block 78. Both ends of the connecting rod 76 are rotatably connected to a fixed shaft three, and both ends of the connecting rod 76 rotate around the fixed shaft three.

[0033] One end of one of the fixed shafts is fixedly connected to the front of the movable rod 73. The connecting rod 76 drives the movable rod 73 to rotate. Movable slots 77 are provided on both sides of the fixed frame 71. The movable slots 77 are used to install the rotating block 78 and the mounting shaft. The mounting shaft is fixedly connected to the middle of the inner wall of the movable slot 77. The rotating block 78 is rotatably connected to the mounting shaft. The rotating block 78 rotates around the mounting shaft in the inner cavity of the movable slot 77. One end of the rotating block 78 drives the connecting rod 76 to move. The front of one end of the rotating block 78 is connected to the inner wall of the movable slot 77. One end of another fixed shaft is fixedly connected. When one end of the rotating block 78 rotates upward around the mounting shaft, one end of the rotating block 78 drives one end of the connecting rod 76 to move upward, so that the other end of the connecting rod 76 drives the movable rod 73 to rotate to one side around the fixed shaft. The bottom of the movable rod 73 presses down on the upper surface of the movable frame 51 and drives the connecting seat 74 to slide along the inner cavity of the connecting groove 75, so that the movable frame 51 and the magnetic block 55 move vertically downward, and the magnetic block 55 attracts the upper surface of the metal workpiece.

[0034] A connecting shaft is fixedly inserted at the other end of the rotating block 78. The connecting shaft is used to install the movable block 79. The movable block 79 is rotatably inserted between the two ends of the connecting shaft and rotates upward around the connecting shaft. A limit block 710 is fixedly connected to the lower surface of the other end of the rotating block 78. The limit block 710 is used to limit the rotation of the movable block 79, so that the movable block 79 cannot rotate downward around the connecting shaft. The upper surface of one end of the limit block 710 is in contact with the lower surface of the movable block 79. An extrusion block 711 is fixedly connected to the top of both sides of the inner wall of the dip-coating box 1. The top and bottom of one side of the extrusion block 711 are both inclined. The extrusion block 711 corresponds to the position of the movable block 79. When the placement rack 2 When moving upward, the fixed frame 71 moves upward together, causing the upper surface of the metal workpiece to separate from the dip coating solution, and causing one end of the movable block 79 to press against the inclined surface of the extrusion block 711, causing the rotating block 78 to rotate around the mounting shaft. The upper surface of the other end of the rotating block 78 is fixedly connected to the stop block 712, which is located on one side of the movable block 79 to limit the rotation of the movable block 79, prevent the movable block 79 from flipping, and ensure that the movable block 79 rotates back to the horizontal position. When the placement frame 2 moves downward, it causes the movable block 79 to move above the extrusion block 711, and the extrusion block 79 rotates upward around the connecting shaft to prevent obstruction of the downward movement of the placement frame 2.

[0035] The top of the placement frame 2 is provided with multiple grooves 713 at equal intervals. The grooves 713 are used to install and accommodate the compression springs 714. The bottom of the inner wall of the groove 713 is fixedly connected to the compression springs 714. The compression springs 714 are used to support the movable frame 51 and ensure the stability of the movable frame 51. The top of the compression springs 714 is in contact with the top of the inner wall of the movable frame 51. When the movable frame 51 moves downward, the bottom of the inner wall of the movable frame 51 compresses and deforms the compression springs 714, and releases the downward pressure on the movable frame 51. Using the elastic action of the compression springs 714, the movable frame 51 is pushed upward, so that the magnetic block 55 moves the metal workpiece upward together, and the lower surface of the metal workpiece is separated from the support block 61.

[0036] The output end of the hydraulic cylinder 4 is connected to a piston rod. The bottom end of the piston rod is fixedly connected to the middle of the upper surface of the fixed frame 71. Through the operation of the hydraulic cylinder 4, the piston rod drives the placement frame 2 to move in the vertical direction, and the distance of movement of the placement frame 2 is controlled, causing the upper surface of the metal workpiece to separate from the dip coating solution. After the workpiece is cooled, the placement frame 2 moves upward, so that the movable block 79 is pressed against the inclined surface of the extrusion block 711. At this time, the bottom of the metal workpiece is still immersed in the solution. The mounting frame 3 is U-shaped. The placement frame 2 is slidably inserted into the inner cavity of the dip coating box 1. A control cabinet is fixedly installed on the upper surface of the mounting frame 3. The inner cavity of the control cabinet is equipped with a control circuit board and electrical components for controlling the operation of the hydraulic cylinder 4.

[0037] The movable frame 51 is arranged in a U-shape. The bottom of the inner wall of the movable frame 51 is in contact with the top of the inner wall of the placement frame 2. A magnetic block 55 is set above one of the support blocks 61. The magnetic block 55 is used to attract and grasp the metal workpiece. The mounting rod 52 is set in the inner cavity of the placement frame 2. Positioning blocks 8 are fixedly connected to both sides of the bottom of the inner wall of the placement frame 2. The positioning blocks 8 are used to limit the two sides of the bottom of the placement frame 2 to prevent the metal workpieces on both sides from falling off.

[0038] Working principle of the invention: By moving the placement frame 2 upward, the movable block 79 and the rotating block 78 are moved to below the pressing block 711. One end of the movable block 79 presses against the inclined surface of the pressing block 711, causing one end of the movable block 79 and the rotating block 78 to rotate downward, and the other end of the rotating block 78 to rotate upward, thus driving one end of the connecting rod 76 to move upward. The other end of the connecting rod 76 pulls the movable rod 73 to one side to rotate, and the bottom of the movable rod 73 presses down on the movable frame 51, causing the movable frame 51 to move multiple magnetic blocks 55 downward together. The lower surface of the magnetic blocks 55 attracts the upper surface of the metal workpiece. Utilizing the elastic action of the compression spring 714, the movable frame 51 and the metal workpiece are pushed together. When the workpiece moves upward, the lower surface of the metal workpiece separates from the support block 61, ensuring that the bottom of the metal workpiece is fully dipped in the plastic coating. At the same time, when the placement rack 2 moves upward, the fixed frame 71 moves upward together, causing the upper surface of the metal workpiece to separate from the plastic coating solution. This also causes one end of the movable block 79 to press against the inclined surface of the extrusion block 711. The limiting block 710 limits the lower surface of the movable block 79, causing the rotating block 78 to rotate around the mounting shaft. When the placement rack 2 moves downward, it causes the movable block 79 to move above the extrusion block 711. The extrusion block 79 rotates upward around the connecting shaft to prevent obstruction of the downward movement of the placement rack 2 and ensure the normal use of the placement rack 2.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hot-dip plastic coating apparatus for metal workpieces, characterized in that, The device includes a dip-coating box (1), a placement rack (2) is provided in the inner cavity of the dip-coating box (1), an mounting rack (3) is fixedly connected between the front and back sides of the outer wall of the dip-coating box (1), a hydraulic cylinder (4) is fixedly installed in the middle of the upper surface of the mounting rack (3), a suction mechanism (5) is provided at the top of the inner cavity of the placement rack (2) for gripping metal workpieces, a support mechanism (6) is provided at the bottom of the inner wall of the placement rack (2) for supporting the lower surface of the metal workpieces, and a pressing mechanism (7) is provided on the upper surface of the placement rack (2) for pressing the suction mechanism (5) downwards. The suction mechanism (5) includes a movable frame (51), the two sides of which are slidably connected to the top of the placement frame (2). Multiple mounting rods (52) are fixedly connected at equal intervals on the lower surface of the movable frame (51). A fixing block (53) is fixedly connected to the bottom end of the mounting rod (52). Multiple fixing rods (54) are fixedly connected at equal intervals on the lower surface of the fixing block (53). A magnetic block (55) is fixedly connected to the bottom end of the fixing rod (54). The pressing mechanism (7) includes a fixed frame (71), the lower surface of the fixed frame (71) is fixedly connected to the upper surface of the placement frame (2), and fixed seats (72) are fixedly connected to both sides of the top of the inner wall of the fixed frame (71). A fixed shaft is fixedly inserted at the bottom of the fixed seat (72), and a movable rod (73) is rotatably inserted on the fixed shaft. The bottom of the movable rod (73) is fixedly connected to a fixed shaft two, and the two ends of the fixed shaft two are rotatably connected to a connecting seat (74). A connecting groove (75) is provided below the connecting seat (74). The two connecting grooves (75) are opened on both sides of the upper surface of the movable frame (51). The inner cavity of the connecting groove (75) is slidably connected to the bottom of the connecting seat (74). A connecting rod (76) is provided on one side of the movable rod (73). The two ends of the connecting rod (76) are rotatably connected to a fixed shaft three. One end of one of the fixed shafts is fixedly connected to the front of the movable rod (73). Movable grooves (77) are provided on both sides of the fixed frame (71). An installation shaft is fixedly connected to the middle of the inner wall of the movable groove (77). A rotating block (78) is rotatably inserted on the installation shaft. The front of one end of the rotating block (78) is fixedly connected to one end of another fixed shaft. The other end of the rotating block (78) is fixedly connected to a connecting shaft, and the two ends of the connecting shaft are rotatably connected to a movable block (79). The lower surface of the other end of the rotating block (78) is fixedly connected to a limiting block (710). The upper surface of one end of the limiting block (710) is in contact with the lower surface of the movable block (79). The top of both sides of the inner wall of the dip-molding box (1) is fixedly connected to an extrusion block (711). The top and bottom of one side of the extrusion block (711) are both inclined. The upper surface of the other end of the rotating block (78) is fixedly connected to a stop block (712).

2. The hot-dip plastic coating apparatus for metal workpieces according to claim 1, characterized in that, The support mechanism (6) includes multiple support blocks (61), which are arranged in the shape of isosceles triangles. The lower surface of the support block (61) is fixedly connected to the bottom of the inner wall of the placement rack (2). Multiple placement slots (62) are evenly and equidistantly opened on the top of the multiple support blocks (61). A protrusion (63) is opened on the bottom of the inner wall of the placement slot (62), and the top of the protrusion (63) is chamfered.

3. The hot-dip plastic coating apparatus for metal workpieces according to claim 2, characterized in that, The top of the placement rack (2) is provided with multiple grooves (713) at equal intervals. A compression spring (714) is fixedly connected to the bottom of the inner wall of the groove (713). The top of the compression spring (714) is in contact with the top of the inner wall of the movable rack (51).

4. The hot-dip plastic coating apparatus for metal workpieces according to claim 1, characterized in that, The output end of the hydraulic cylinder (4) is connected to a piston rod. The bottom end of the piston rod is fixedly connected to the middle of the upper surface of the fixed frame (71). The mounting frame (3) is U-shaped. The placement frame (2) is slidably inserted into the inner cavity of the dip-coating box (1). The upper surface of the mounting frame (3) is fixedly mounted with a control cabinet.

5. The hot-dip plastic coating apparatus for metal workpieces according to claim 2, characterized in that, The movable frame (51) is arranged in a U-shape. The bottom of the inner wall of the movable frame (51) is in contact with the top of the inner wall of the placement frame (2). The magnetic block (55) is located above one of the support blocks (61). The mounting rod (52) is located in the inner cavity of the placement frame (2). Positioning blocks (8) are fixedly connected to both sides of the bottom of the inner wall of the placement frame (2).

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