Automatic tinplate box forming machine

Abstract

The invention relates to an automatic tinplate box forming machine applied to the field of tinplate box production, and the automatic tinplate box forming machine comprises a detachable die, a lifting block, a lifting air cylinder and a positioning block, and by adopting the positioning block, the lifting block, the lifting air cylinder and other structures, a stamped iron box finished product can be lifted and obliquely discharged through the lifting air cylinder and the lifting block, and the production efficiency is improved. In this way, the purposes of full-automatic feeding and discharging and full-automatic stamping are achieved. According to the automatic tinplate box forming machine, the using effects of full-automatic feeding and discharging and full-automatic stamping can be achieved only by slightly improving an existing automatic tinplate box forming machine, additional equipment such as a mechanical arm does not need to be adopted, the improvement cost of the automatic tinplate box forming machine is greatly saved, and better universality is achieved; in addition, automatic discharging of finished tinplate boxes is achieved through a transmission structure, stamping power output is fully utilized, the energy utilization efficiency is improved, and the energy-saving and environment-friendly production effect is achieved.

Description

Technical Field

[0001] This invention relates to an automatic tin box forming machine, and more particularly to an automatic tin box forming machine applied in the field of tin box production. Background Technology

[0002] Tinplate boxes, also known as tin-plated iron boxes, are a type of packaging box made of tinplate. Tinplate, also called tin-plated iron, is a common name for electroplated tin-coated thin steel sheet, abbreviated as SPTE, which refers to cold-rolled low-carbon thin steel sheet or strip plated with commercially pure tin on both sides. Tin primarily serves to prevent corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability, and aesthetic appearance of tin into one material, possessing characteristics such as corrosion resistance, non-toxicity, high strength, and good ductility. Due to its properties, tinplate has good ductility, oxidation resistance, and can be printed on, is not easily damaged, and can be made into various shapes, making it convenient for transportation and a preferred packaging material. Tinplate box forming uses the punch of a stamping machine to punch iron material into a pre-made mold, using pressure to deform the tinplate material into shape. The initial stamped box has a large diameter, which can be reduced through a re-stamping process. Traditional automatic tin box forming machines do not have automatic loading and unloading functions, requiring manual loading and unloading (see https: / / haokan.baidu.com / v?pd=wisenatural&vid=10277369915178007263). This is combined with the automatic tin box forming machine for automatic stamping and forming operations, which results in high labor costs and certain dangers.

[0003] To address the issue of inability to automatically load and unload materials, a certain automatic tin box forming machine on the market adopts a design equipped with an external robotic arm (see https: / / haokan.baidu.com / v?pd=wisenatural&vid=17927707577155672281), and has a certain market share.

[0004] Chinese patent CN111959172B discloses an automatic logo stamping loading and unloading system, including a loading mechanism, a stamping mechanism, an unloading mechanism, and a transfer mechanism. The stamping mechanism includes a raw material stamping area and a product stamping area. The transfer mechanism includes a suction claw assembly and a robotic arm connected to and driving the suction claw assembly. The suction claw assembly transfers the raw material contained in the loading mechanism to the raw material stamping area. After the stamping mechanism completes the stamping of the raw material, the suction claw assembly transfers multiple logo icons generated from the raw material stamping to the product stamping area. After the stamping mechanism completes the stamping of the logo icons, the suction claw assembly transfers the logo icons to the unloading mechanism. The automatic logo stamping loading and unloading system provided by this invention has a safe working environment, a high degree of automation, and high production efficiency.

[0005] The aforementioned automatic loading and unloading system works on a similar principle to existing automatic tin box forming machines equipped with external robotic arms.

[0006] However, existing automatic tin box forming machines equipped with external robotic arms have added external robotic arm equipment and external robotic arm control systems (hardware and software). They cannot be completely improved on traditional automatic tin box forming machines. Compared with traditional automatic tin box forming machines, the improvement cost is greatly increased, thereby increasing production costs and the burden of technological improvement on enterprises. Summary of the Invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to make minor improvements to the existing automatic tin box forming machine to achieve automatic loading and unloading, automatic stamping and forming, etc.; at the same time, reduce the improvement cost of the automatic tin box forming machine.

[0008] To solve the above problems, the present invention provides an automatic tin box forming machine, including a forming machine base, a mold mounted on the forming machine base, a punch head adapted to the mold above the mold, a punch cylinder for driving the punch head to move up and down fixed at the upper end of the forming machine base by a bracket, and a feeding mechanism for intermittent feeding provided on one side of the forming machine base. The mold includes a mold frame and a bottom mold. The mold frame is fixedly embedded in the mounting groove in the middle of the forming machine base, and the bottom mold is movably installed in the mold frame and its periphery is in contact with the inner periphery wall of the mold frame. A first receiving groove is provided on the bottom surface of the groove in the middle of the molding base. The length and width of the first receiving groove are both smaller than the length and width of the bottom mold. A lifting block is movably installed in the first receiving tank. The lifting block has a trapezoidal cross-section. The edge where the upper end face of the lifting block intersects with the inclined surface is hinged to the bottom surface of the bottom mold. The inclined surface of the lifting block faces away from the feeding mechanism. A lifting cylinder is fixed to the bottom surface of the molding machine base. The piston rod of the lifting cylinder moves through the bottom of the molding machine base and is fixed to the lower end of the lifting block. The upper surface of the molding base is equipped with a positioning block that buffers and limits the iron box material. The positioning block is located on the side of the mold away from the feeding mechanism.

[0009] In the aforementioned automatic tin box forming machine, a positioning block is used in conjunction with a feeding mechanism to position the tin box raw material, so that the tin box raw material automatically stops at a predetermined position above the mold. The finished tin box is then lifted and tilted for discharge by a lifting cylinder and a lifting block, thereby achieving fully automatic loading and unloading and fully automatic stamping. Only minor modifications are needed to the existing automatic tin box forming machine, without the need for additional robotic arms or other equipment, reducing the improvement cost of fully automatic stamping and realizing fully automatic stamping and forming operations.

[0010] As a further addition to this application, the length of the upper surface of the lifting block is less than half the length of the bottom surface of the bottom mold.

[0011] As a further supplement to this application, a rounded corner is provided at the intersection of the side of the bottom mold away from the inclined surface of the lifting block and the bottom surface of the bottom mold.

[0012] As a further supplement to this application, a soft contact block is fixedly embedded on the side of the bottom mold away from the rounded corner. When the bottom mold is located above the mold frame and is tilted, the soft contact block contacts the upper edge of the mold frame.

[0013] As a further supplement to this application, the groove on the bottom mold for embedding the soft contact block is integrally formed with reinforcing ribs.

[0014] As a further supplement to this application, a second receiving groove is provided at the upper end of the lifting block, and an auxiliary reset spring is fixed in the second receiving groove. The upper end of the auxiliary reset spring is fixed to the bottom surface of the bottom mold, and the tension generated by the auxiliary reset spring is less than the gravity of the bottom mold when it is tilted.

[0015] As a further supplement to this application, the positioning block includes a fixed plate and a buffer plate. The fixed plate is fixed to the upper surface of the forming machine base, and the buffer plate is located on the side of the fixed plate near the feeding mechanism and is elastically connected to the fixed plate through an elastic element.

[0016] As a further supplement to this application, the elastic element includes metal springs, and multiple metal springs are arranged in an equidistant array along the length direction of the fixed plate. The two ends of the multiple metal springs are respectively fixed to the side wall of the fixed plate and the buffer soft plate that are close to each other.

[0017] As a further supplement to this application, when the bottom mold is tilted along the inclined surface of the lifting block after being raised, the horizontal height of the lowest point of the upper surface of the bottom mold is higher than the horizontal height of the highest point of the fixed plate or the buffer plate.

[0018] As a further supplement to this application, a driven roller is rolledly connected to the upper surface of the molding base, and multiple driven rollers are arranged in a parallel array between the feeding mechanism and the mold. A material discharge ramp is provided on the upper surface of the molding base at the end away from the feeding mechanism. The material discharge ramp is located on the side of the positioning block away from the mold.

[0019] As another improvement of this application, a lifting rod is fixed to the lower end of the lifting block, and a movable rod is fixed to one side of the lifting rod via a connecting rod; A fixed rod is fixed to one side of the stamping head by a fixed block, and the movable rod is slidably connected inside the fixed rod; The fixed rod has a locking hole on the side near the molding base, and the movable rod has a hemispherical locking block that is adapted to the fixed rod and protrudes outward on the side near the molding base by a spring. A top block is fixed on the side of the molding base near the fixed rod. The top block is located in the middle of the fixed rod and corresponds to the position of the locking hole. The upper end of the movable rod is also elastically connected to the inner top wall of the fixed rod by a spring. The spring force at the upper end of the hemispherical block is less than the spring force between the movable rod and the hemispherical block.

[0020] In summary, the positioning block, in conjunction with the feeding mechanism, is used to position the tin box material, so that the tin box material automatically stops at the predetermined position above the mold. Specifically, the feeding mechanism conveys the tin box material in a straight line to the top of the mold. The tin box material moves forward under the action of inertia, and finally one side contacts the side of the positioning block, and is stopped above the mold under the action of the positioning block, thus achieving the purpose of positioning and placing the tin box material. It can also lift and tilt the stamped iron box product through the lifting cylinder and lifting block. Specifically, after stamping, the piston rod of the lifting cylinder extends and drives the lifting block to move upward. The lifting block simultaneously drives the bottom die to move upward, and finally the bottom die rises to the point of separation from the mold frame. At this time, the bottom die tilts along the hinge with the lifting block under its own weight, so that the finished product on the bottom die slides along the upper surface of the bottom die to the side of the forming base away from the feeding mechanism, completing the product removal operation. Then the lifting cylinder is restarted and the bottom die is driven down through the lifting block, so that one side of the bottom die contacts one edge of the upper end of the mold frame, and after contact, it flips upward to reset. Finally, the bottom die moves to the lower end of the mold frame to complete the reset. This achieves the purpose of fully automatic loading and unloading and fully automatic stamping. This automatic tin box forming machine only requires minor modifications to existing automatic tin box forming machines to achieve fully automatic loading and unloading and fully automatic stamping. It does not require additional robotic arms or other equipment, which greatly saves the cost of modifying the automatic tin box forming machine and has better versatility. In other embodiments, the transmission structure is fully utilized to realize the automatic discharge of the finished tin box, achieving the effect of using the stamping power to drive the finished tin box to discharge; compared with using a cylinder to eject, the equipment cost is reduced, and the power output of the stamping is fully utilized to improve the energy utilization efficiency, achieving the effect of energy-saving and environmentally friendly production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this application; Figure 2 This is a cross-sectional view of the forming base and die during stamping according to the first embodiment of this application; Figure 3 This is a schematic diagram of the structure of the bottom mold when it flips along the upper end of the lifting block according to the first embodiment of this application; Figure 4 for Figure 3 Enlarged view of the structure at point A in the image; Figure 5 This is a schematic diagram illustrating the separation of the bottom mold and the soft contact block in the first embodiment of this application; Figure 6 This is a schematic diagram of the fixing plate structure according to the first embodiment of this application; Figure 7 This is a diagram showing the state of the lifting block raising the bottom mold for material discharge according to the first embodiment of this application. Figure 8 This is a schematic diagram of the automatic tin box forming machine, feeding mechanism, and stacking frame in accordance with the first embodiment of this application. Figure 9 This is a side view of the fixed rod in the second embodiment of this application.

[0022] Explanation of the labels in the diagram: 1. Molding base; 2. Mold; 21. Mold frame; 22. Bottom mold; 221. Rounded corner; 222. Reinforcing rib; 3. Punching head; 4. Punching cylinder; 5. Positioning block; 51. Fixing plate; 52. Buffer plate; 53. Metal spring; 6. Lifting block; 61. Second receiving groove; 7. Auxiliary return spring; 8. Lifting cylinder; 9. Driven roller; 10. Soft contact block; 11. Unloading ramp; 12. First receiving groove; 13. Feeding mechanism; 14. Stacking box frame; 15. Lifting rod; 16. Connecting rod; 17. Movable rod; 18. Fixing rod; 181. Locking hole; 19. Hemispherical locking block; 20. Top block. Detailed Implementation

[0023] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] Implementation method 1: This invention provides an automatic tin box forming machine. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 7 and Figure 8 The system includes a forming base 1, a mold 2 mounted on the forming base 1, a punch head 3 adapted to the mold 2 above the mold 2, a punch cylinder 4 for driving the punch head 3 to move up and down fixed at the upper end of the forming base 1 by a bracket, and a feeding mechanism 13 for intermittent feeding on one side of the forming base 1. The mold 2 includes a mold frame 21 and a bottom mold 22. The mold frame 21 is fixedly embedded in the mounting groove in the middle of the forming base 1, and the bottom mold 22 is movably installed in the mold frame 21 and its periphery is in contact with the inner periphery wall of the mold frame 21. A first receiving groove 12 is provided on the bottom surface of the groove in the middle of the molding base 1. The length and width of the first receiving groove 12 are both smaller than the length and width of the bottom mold 22. A lifting block 6 is movably installed in the first receiving groove 12. The lifting block 6 has a trapezoidal cross section. The edge where the upper end face of the lifting block 6 intersects with the inclined surface is hinged to the bottom surface of the bottom mold 22. The inclined surface of the lifting block 6 faces the side away from the feeding mechanism 13. A lifting cylinder 8 is fixed on the bottom surface of the molding base 1. The piston rod of the lifting cylinder 8 moves through the bottom of the molding base 1 and is fixed to the lower end of the lifting block 6. A positioning block 5 is installed on the upper surface of the molding base 1 to buffer and limit the iron box material. The positioning block 5 is located on the side of the mold 2 away from the feeding mechanism 13.

[0025] Based on the above structure, the positioning block 5 is used in conjunction with the feeding mechanism 13 to position the iron plate of the iron box raw material, so that the iron box raw material automatically stops at the predetermined position above the mold 2. Specifically, the feeding mechanism 13 conveys the iron box raw material in a straight line to the top of the mold 2. The iron box raw material moves forward under the action of inertia, and finally one side contacts the side of the positioning block 5, and stops above the mold 2 under the action of the positioning block 5, so as to achieve the purpose of positioning and placing the iron box raw material. The machine can also lift and tilt the stamped iron box product through the lifting cylinder 8 and lifting block 6. Specifically, after stamping, the piston rod of the lifting cylinder 8 extends and drives the lifting block 6 to move upward. The lifting block 6 simultaneously drives the bottom mold 22 to move upward, and finally the bottom mold 22 rises to disengage from the mold frame 21. At this time, the bottom mold 22 tilts along the hinge with the lifting block 6 under its own weight, so that the finished product on the bottom mold 22 slides along the upper surface of the bottom mold 22 to the side of the forming base 1 away from the feeding mechanism 13, completing the product removal operation. Then the lifting cylinder 8 is restarted and the bottom mold 22 is lowered through the lifting block 6, so that one side of the bottom mold 22 contacts one edge of the upper end of the mold frame 21, and after contact, it flips upward to reset. Finally, the bottom mold 22 moves to the lower end of the mold frame 21 to complete the reset. This achieves the purpose of fully automatic loading and unloading and fully automatic stamping. This automatic tin box forming machine only requires minor modifications to existing automatic tin box forming machines to achieve fully automatic loading and unloading and fully automatic stamping. It eliminates the need for additional robotic arms and other equipment, greatly saving on the cost of modifying the automatic tin box forming machine and offering greater versatility.

[0026] It should be noted that the automatic tin box forming machine should also have a corresponding programmable industrial controller (not shown in the figure). The controller can be a commonly used controller in the prior art that is applicable to this embodiment. It is equipped with a control program and can control the opening and closing, stroke, etc. of the feeding mechanism 13, the lifting cylinder 8 and the stamping cylinder 4, so as to realize automatic stamping and forming operations.

[0027] Figure 2 The length of the upper surface of the lifting block 6 is less than half the length of the bottom surface of the bottom mold 22. This ensures that the suspended part of the bottom mold 22, which does not contact the upper surface of the lifting block 6, has a large gravity, thereby achieving the effect of automatic tilting of the bottom mold 22.

[0028] Figure 5 A rounded corner 221 is provided at the intersection of the side of the bottom mold 22 away from the inclined surface of the lifting block 6 and the bottom surface of the bottom mold 22. By providing the rounded corner 221, the bottom of one side of the bottom mold 22 is prevented from forming an abutment contact with the side wall of the mold frame 21 during the tilting or resetting process, thereby avoiding the situation where the bottom mold 22 cannot tilt or cannot be reset, and ensuring the smooth progress of the blanking operation and the stamping operation.

[0029] Figure 3 and Figure 5 A soft contact block 10 is fixedly embedded on the side of the bottom mold 22 away from the rounded corner 221. When the bottom mold 22 is located above the mold frame 21 and tilted, the soft contact block 10 contacts the upper edge of the mold frame 21. The soft contact block 10 ensures that when the bottom mold 22 is tilted and reset (i.e., when the bottom mold 22 descends with the lifting block 6), the bottom mold 22 makes soft contact with the upper edge of the mold frame 21, avoiding mutual wear between the mold frame 21 and the bottom mold 22 and extending the service life of the mold 2. A reinforcing rib 222 is integrally formed in the groove of the bottom mold 22 for embedding the soft contact block 10. The reinforcing rib 222 enhances the structural stability of the groove of the bottom mold 22 and avoids the deformation of the bottom mold 22 caused by embedding the soft contact block 10.

[0030] Figures 3-4The lifting block 6 has a second receiving groove 61 at its upper end. An auxiliary reset spring 7 is fixed in the second receiving groove 61. The upper end of the auxiliary reset spring 7 is fixed to the bottom surface of the bottom mold 22. The tension generated by the auxiliary reset spring 7 is less than the weight of the bottom mold 22 when it is tilted. With the setting of the auxiliary reset spring 7, after the bottom mold 22 makes soft contact with the edge of the upper end of the mold frame 21, when the bottom mold 22 flips upward, the auxiliary reset spring 7 provides a certain tension to assist the bottom mold 22 in completing the flip reset, thereby further protecting the soft contact block 10, and at the same time making the reset of the bottom mold 22 faster and smoother.

[0031] Figure 6 The positioning block 5 includes a fixed plate 51 and a buffer plate 52. The fixed plate 51 is fixed to the upper surface of the molding base 1. The buffer plate 52 is made of a soft material (such as rubber) and has good elasticity. The buffer plate 52 is located on the side of the fixed plate 51 near the feeding mechanism 13 and is elastically connected to the fixed plate 51 through an elastic element. The elastic element includes multiple metal springs 53, which are evenly distributed along the length of the fixed plate 51. The two ends of the multiple metal springs 53 are respectively close to the fixed plate 51 and the buffer plate 52 on the same side. With the wall fixed, the positioning block 5 ensures that when the iron box material moves to the top of the mold 2 under the action of the feeding mechanism 13, one side of the iron box material first contacts the buffer plate 52. The buffer plate 52 can ensure that there is no hard impact on the iron box material, and provide a certain degree of protection for the iron box material. At the same time, it can buffer the impact force, thereby preventing the iron box material from sliding backward under the impact force. The metal spring 53 can further buffer the impact force, improve the buffering effect, and at the same time ensure that the iron box material is stopped at the predetermined position, ensuring accurate positioning during feeding.

[0032] Figure 7 When the bottom mold 22 is tilted along the inclined surface of the lifting block 6 after being raised, the lowest point of the upper surface of the bottom mold 22 is higher than the highest point of the fixed plate 51 or the buffer plate 52. This ensures that the finished iron box can cross the fixed plate 51 or the buffer plate 52 and be successfully unloaded.

[0033] Figures 7-8 The upper surface of the forming base 1 is shown to be connected to a driven roller 9. Multiple driven rollers 9 are arranged in a parallel array between the feeding mechanism 13 and the mold 2. By setting the driven rollers 9, the friction between the upper surface of the forming base 1 and the iron box material can be reduced, thereby ensuring that the iron box material can slide smoothly to the top of the mold 2. A material discharge ramp 11 is provided on the upper surface of the forming base 1 at the end away from the feeding mechanism 13. The material discharge ramp 11 is located on the side of the positioning block 5 away from the mold 2. A movable stacking frame 14 is also provided on the side of the forming base 1 located on the material discharge ramp 11 to facilitate the collection and stacking of finished tin boxes. The setting of the material discharge ramp 11 ensures that the finished tin boxes can leave the upper surface of the forming base 1 smoothly after forming, and complete the material discharge operation. At the same time, the stacking frame 14 can collect the finished products and facilitate subsequent transportation.

[0034] The second implementation method: This invention provides an automatic tin box forming machine. Please refer to [link / reference]. Figure 9 The difference between it and Example 1 is that: A lifting rod 15 is fixed to the lower end of the lifting block 6, and a movable rod 17 is fixed to one side of the lifting rod 15 via a connecting rod 16. A fixed rod 18 is fixed on one side of the stamping head 3 by a fixed block, and a movable rod 17 is slidably connected inside the fixed rod 18; The fixed rod 18 has a locking hole 181 on the side near the molding base 1, and the movable rod 17 has a hemispherical locking block 19 that is adapted to the fixed rod 18 and protrudes outward on the side near the molding base 1 via a spring. A top block 20 is fixed on the side of the molding base 1 near the fixed rod 18. The top block 20 is located in the middle of the fixed rod 18 and corresponds to the position of the locking hole 181. The upper end of the movable rod 17 is also elastically connected to the inner top wall of the fixed rod 18 by a spring. The spring force at the upper end of the hemispherical block 19 is less than the spring force between the movable rod 17 and the hemispherical block 19.

[0035] Based on the above structure, when the stamping head 3 moves downward under the drive of the stamping cylinder 4, the fixed rod 18 moves downward accordingly. At this time, since the lifting block 6 is already at its lowest position and cannot descend, the fixed rod 18 gradually descends and gradually covers the movable rod 17. After descending a certain distance, the hemispherical locking block 19 retracts into the movable rod 17 under pressure. After continuing to descend for a period of time, the hemispherical locking block 19 overlaps with the locking hole 181 and pops out under the action of the spring. At this time, due to the large pressure applied by the stamping cylinder 4, the hemispherical locking block 19 retracts into the movable rod 17 again, finally allowing the stamping head 3 to descend into the mold 2 and smoothly cooperate with the mold 2 to complete the stamping and forming operation of the tin box. After completion, the stamping head 3 moves upward under the drive of the stamping cylinder 4. At this time, the fixed rod 18 moves upward accordingly and gradually separates from the movable rod 17. When the hemispherical locking block 19 overlaps with the locking hole 181... The hemispherical locking block 19 pops out under the action of the spring and locks into the locking hole 181 for limiting, so that the movable rod 17 and the fixed rod 18 form a temporary long rod. Then, the movable rod 17 rises synchronously with the fixed rod 18 and drives the lifting rod 15 to rise through the connecting rod 16. When the lifting rod 15 rises, it drives the lifting block 6 to rise, so that the formed tin box is discharged (see the steps in Example 1 for details). After the tin box is discharged, the movable rod 17 continues to rise a short distance with the fixed rod 18, so that the locking hole 181 moves to the same position as the top block 20, so that the top block 20 applies pressure to the hemispherical locking block 19 and presses the hemispherical locking block 19 into the movable rod 17. Then, the movable rod 17 automatically descends under the action of the lifting block 6, the lifting rod 15, the connecting rod 16, the movable rod 17 itself and the elastic force of the spring, so that the lifting block 6 is reset, and the bottom mold 22 is reset, thus facilitating the next stamping. It achieves the effect of using stamping power to drive the finished tin box through discharge; compared with using cylinder ejection, it reduces equipment costs and makes full use of the stamping power output, improving energy (power) utilization efficiency and achieving energy-saving and environmentally friendly production.

[0036] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. An automatic tinplate box forming machine, comprising a forming machine base (1), a mold (2) being mounted on the forming machine base (1), a punch head (3) adapted to the mold (2) being arranged above the mold (2), a punch cylinder (4) for driving the punch head (3) to move up and down being fixed at the upper end of the forming machine base (1) through a bracket, a feeding mechanism (13) for intermittent feeding being arranged on one side of the forming machine base (1), characterized in that: The mold (2) comprises a mold frame (21) and a bottom mold (22); the mold frame (21) is fixedly embedded in a mounting groove in the middle of the molding machine base (1); the bottom mold (22) is movably mounted in the mold frame (21) and its circumferential side is in contact with the inner circumferential side wall of the mold frame (21); A first accommodating groove (12) is provided on the bottom surface of the groove in the middle of the molding machine base (1), and the length and width of the first accommodating groove (12) are both smaller than the length and width of the bottom mold (22); A lifting block (6) is movably mounted in the first receiving groove (12), the lifting block (6) having a trapezoidal cross section, the edge where the upper end surface of the lifting block (6) intersects with the inclined surface is hinged to the bottom surface of the bottom mold (22), and the inclined surface of the lifting block (6) faces a side away from the feeding mechanism (13); A lifting cylinder (8) is fixed to the bottom surface of the molding machine base (1), and a piston rod of the lifting cylinder (8) movably penetrates the bottom of the molding machine base (1) and is fixed to the lower end of the lifting block (6); A positioning block (5) for buffering and limiting the iron box raw material is installed on the upper surface of the molding machine base (1), and the positioning block (5) is located on a side of the mold (2) away from the feeding mechanism (13); A rounded corner portion (221) is provided at the intersection edge between the side of the bottom mold (22) away from the inclined surface of the lifting block (6) and the bottom surface of the bottom mold (22); A soft contact block (10) is fixedly embedded on a side of the bottom mold (22) away from the rounded corner portion (221); the bottom mold (22) is located above the mold frame (21) and the soft contact block (10) contacts the upper edge of the mold frame (21) when the bottom mold (22) is tilted; a reinforcing rib (222) is integrally formed in a groove on the bottom mold (22) for embedding the soft contact block (10); A second receiving groove (61) is formed at the upper end of the lifting block (6), an auxiliary return spring (7) is fixed in the second receiving groove (61), the upper end of the auxiliary return spring (7) is fixed to the bottom surface of the bottom mold (22), and the tension generated by the auxiliary return spring (7) is smaller than the gravity when the bottom mold (22) itself is tilted; When the bottom mold (22) is raised and tilted along the inclined surface of the lifting block (6), the horizontal height of the lowest point of the upper surface of the bottom mold (22) is higher than the horizontal height of the highest point of the fixed plate (51) or the buffer soft plate (52); The lifting block (6) further comprises a lifting rod (15) fixed at the lower end thereof, and a movable rod (17) fixed to one side of the lifting rod (15) via a connecting rod (16); A fixed rod (18) is fixed to one side of the punch head (3) via a fixed block, and the movable rod (17) is slidably connected inside the fixed rod (18); A clamping hole (181) is provided on a side of the fixed rod (18) close to (1), and a hemispherical clamping block (19) which is adapted to the fixed rod (18) and protrudes outward is elastically embedded on a side of the movable rod (17) close to (1) through a spring. A top block (20) is fixed on one side of the (1) close to the fixing rod (18), and the top block (20) is located in the middle of the fixing rod (18) and corresponds to the position of the clamping hole (181); The upper end of the movable rod (17) is also elastically connected to the inner top wall of the fixed rod (18) via a spring, and the elastic force of the spring at the upper end of the hemispherical clamping block (19) is smaller than the elastic force of the spring between the movable rod (17) and the hemispherical clamping block (19).

2. The automatic tinplate box forming machine according to claim 1, characterized in that: The positioning block (5) comprises a fixed plate (51) and a soft buffer plate (52); the fixed plate (51) is fixed to the upper surface of the molding machine base (1); the soft buffer plate (52) is located on a side of the fixed plate (51) close to the feeding mechanism (13) and is elastically connected to the fixed plate (51) via an elastic member.

3. The automatic tinplate box forming machine according to claim 2, characterized in that: The elastic member comprises a metal spring sheet (53), a plurality of the metal spring sheets (53) are provided and are distributed in an array equidistantly along the length direction of the fixed plate (51), and two ends of the plurality of metal spring sheets (53) are respectively fixed to the side wall of the fixed plate (51) and the buffer soft plate (52) on one side close to each other.

4. The automatic tinplate box forming machine according to claim 1, characterized in that: The upper surface of the molding machine base (1) is rollingly connected to a driven roller (9), and a plurality of driven rollers (9) are provided and distributed in an array between the feeding mechanism (13) and the mold (2); A material discharge slope (11) is provided at one end of the upper surface of the molding machine base (1) away from the feeding mechanism (13), and the material discharge slope (11) is located on a side of the positioning block (5) away from the mold (2).

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