Die changing station based on annular refrigerator door foaming line die frame

Abstract

The utility model relates to a mould changing station based on an annular refrigerator door body foaming line mould frame, the mould changing station is used for changing moulds in the foaming mould frame, the foaming mould frame is formed by hinging an upper mould frame and a lower mould frame, moulds matched with the upper mould frame and the lower mould frame are respectively embedded in the upper mould frame and the lower mould frame through screws, and the mould changing station is used for changing the moulds in the foaming mould frame. The die changing station comprises a supporting frame which is of a door-shaped structure and composed of a square frame beam and stand columns, and first platform plates are horizontally and symmetrically arranged on the lower portions of the pair of stand columns located on the same end side of the square frame beam respectively. An electric hoist I is obliquely and downwards suspended on the square frame beam along one side of the short axis of the square frame beam; and the electric hoist I hooks and lifts the upper mold frame of the foaming mold frame in a closed state through a hook arranged at the telescopic end of the electric hoist I. According to the die changing station, due to the arrangement of the first electric hoist, the original heavy work that two persons are needed to cooperatively and manually lift the upper die frame is replaced, the physical output of operators is greatly reduced, meanwhile, the die changing period is shortened, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to refrigerator door body foaming mould frame technical field, especially relates to the mould changing station based on annular refrigerator door body foaming line mould frame. BACKGROUND

[0002] On the annular refrigerator door body foaming line, the upper mould frame and the lower mould frame are connected by a hinged structure. The two parts of the mould frame are embedded with moulds matched with the upper and lower mould frames by screws. In the production process, after the moulds are filled with foaming material, the upper and lower mould frames are precisely closed, and the foaming material is expanded by heating to form a required refrigerator door body insulation layer.

[0003] However, as the production cycle progresses, the moulds need to be replaced regularly due to wear or product specification changes. The current replacement process not only requires a lot of labor, but also has safety hazards. Specifically, two operators need to work together to loosen the screws that fix the moulds in the upper and lower mould frames, then lift the heavy upper mould frame together to slowly open it. At this time, the moulds in the upper mould frame will naturally fall on the moulds in the lower mould frame. Then, the old moulds are removed by a forklift, and new moulds are installed. Finally, the operators lower the upper mould frame and tighten the screws that fix the moulds in the upper and lower mould frames. During the entire process, manually lifting or lowering the heavy upper mould frame not only consumes a lot of physical strength, but also easily causes accidental injuries such as sprains or heavy object injuries due to improper operation, greatly increasing the risk coefficient of the operation. SUMMARY

[0004] The utility model provides a mould changing station based on annular refrigerator door body foaming line mould frame in view of the deficiency of prior art, specific technical scheme is as follows:

[0005] The utility model provides a mould changing station based on annular refrigerator door body foaming line mould frame, which is used for replacing the moulds in the foaming mould frame. The foaming mould frame is composed of an upper mould frame and a lower mould frame connected by a hinge. Screws are embedded in the upper and lower mould frames to fix the moulds matched with them. The mould changing station includes a support frame with a door-shaped structure composed of a square frame beam and a pair of vertical columns. A pair of vertical columns are horizontally and symmetrically arranged on the lower part of the square frame beam at the same end side. A platform plate one is arranged on the lower part of each vertical column. An electric hoist one is inclined downward on one side of the short axis of the square frame beam. The hook of the electric hoist one is connected to the upper mould frame of the foaming mould frame in the closed state to lift it up.

[0006] As a preferred technical solution of the utility model, a H-shaped longitudinal beam is installed on the top surface of the square frame beam along the short axis. A cantilever frame with an inverted L-shaped structure is installed on one end of the H-shaped longitudinal beam. The electric hoist one with an adjustable inclination angle is installed on the lower part of the cantilever frame.

[0007] As an optimal technical scheme of the utility model, the second electric hoist is suspended below the long axis of the square frame beam and can be transversely positioned and slid, and the hook arranged at the telescopic end of the second electric hoist can hoist the mold in the waiting hoisting state in the foaming mold frame to a height where the prongs of the external forklift can be forked.

[0008] As an optimal technical scheme of the utility model, the bottom surface of the square frame beam is provided with a H-shaped cross beam along the long axis, and a horizontal moving assembly is arranged at the lower part of the H-shaped cross beam; the horizontal moving assembly comprises mounting plates vertically arranged on the two sides of the H-shaped cross beam, a pair of T-shaped structure pulleys are vertically and symmetrically arranged on the top inner sides of the two mounting plates, respectively, a pair of pulleys are rollingly hung on the lower edge of the H-shaped cross beam, and one of the pulleys is driven to walk by the motor arranged on the outer side of the corresponding mounting plate; a suspension rod is vertically connected between the bottom parts of the two mounting plates, and springs are vertically and symmetrically connected between the end parts of the suspension rod, respectively; and the second electric hoist is hung below the suspension rod.

[0009] As an optimal technical scheme of the utility model, a limiting assembly is arranged at the upper part of the pair of vertical columns on the same side of the square frame beam; the limiting assembly comprises a reinforcing beam one horizontally mounted on the inner side of the corresponding vertical column, and cantilever beams are vertically and symmetrically mounted on the inner side end parts of the reinforcing beam one, respectively; and a limiting pin for preventing the upper mold frame from accidentally falling after being lifted is vertically and gapingly arranged at the end part of the cantilever beam.

[0010] As an optimal technical scheme of the utility model, the end surface outer sides of the platform plate one are vertically and fixedly connected with rotating shafts, respectively, and the two rotating shafts are rotatably connected with bearing seats vertically mounted on the inner vertical surfaces of the corresponding vertical columns, respectively;

[0011] The platform plate one is divided into a horizontal state and a vertical state, when in the horizontal state, the end parts thereof are supported by suspension plates horizontally fixed on the corresponding vertical columns, respectively; and when in the vertical state, the platform plate one is detachably inserted and fixed by the positioning assembly arranged on the corresponding vertical column on the inlet side of the support frame.

[0012] As an optimal technical scheme of the utility model, the positioning assembly comprises a mounting block fixed on the corresponding vertical column on the inlet side of the support frame, the mounting block is in an inverted L-shaped structure, a positioning pin is vertically and gapingly inserted on the horizontal part of the mounting block, and the positioning pin is vertically and detachably inserted into the positioning hole arranged on the end part of the inner surface of the corresponding platform plate one.

[0013] As an optimal technical scheme of the utility model, the platform plate two is horizontally fixed on the vertical column away from the inlet side of the support frame, and the platform plate two is flush with the platform plate one in the horizontal state; one end side of the platform plate two is fixedly suspended by the reinforcing beam two transversely and vertically connected on the corresponding vertical column, and the other end side thereof is fixedly supported by the ladder frame arranged on the ground.

[0014] The utility model has the advantages that:

[0015] The die changing station of the utility model replaces the heavy labor of manually lifting the upper die frame by two people through the setting of the electric hoist one.

[0016] The precise control and stable lifting capacity of the electric hoist one effectively avoid the accidental injuries such as sprain and heavy object bruise when lifting or lowering the heavy upper die frame manually, significantly reduce the risk coefficient of operation, and provide a safer working environment for the operator.

[0017] The portal structure support frame composed of the square beam and the column is stable in structure and can bear the weight of the electric hoist one and the upper die frame, and meanwhile, the setting of the platform plate one also provides an operation platform for the operator to conveniently loosen and tighten the screws on the die. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A perspective structural schematic view of the die changing station of the utility model is shown;

[0019] Figure 2 A perspective structural schematic view of the die changing station of the utility model is shown; Figure 1 An enlarged view of the structure of the A part;

[0020] Figure 3 A perspective structural schematic view of the die changing station of the utility model is shown;

[0021] Figure 4 An enlarged view of the structure of the B part; Figure 3

[0022] An enlarged view of the structure of the B part; Figure 5 A front view of the structure of the die changing station of the utility model is shown;

[0023] Figure 6 A front view of the structure of the die changing station of the utility model is shown;

[0024] Figure 7 A front view of the structure of the die changing station of the utility model is shown;

[0025] As shown in the figure: 1, support frame; 11, square box beam; 12, column; 2, electric hoist 1; 21, I-beam; 22, cantilever frame; 3, electric hoist 2; 31, I-beam; 32, horizontal moving assembly; 321, mounting plate; 322, suspension rod; 323, pulley; 324, motor; 325, spring; 4, platform plate 1; 41, positioning hole; 42, shaft; 43, bearing seat; 44, suspension plate; 5, limiting assembly; 51, reinforcing beam 1; 52, cantilever beam; 53, limiting pin; 6, positioning assembly; 61, mounting block; 62, positioning pin; 7, platform plate 2; 71, reinforcing beam 2; 72, step frame; 8, foaming mold frame; 81, upper mold frame; 82, lower mold frame. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0027] Example 1

[0028] To solve the technical problems in the background art, the following mold changing station based on the annular refrigerator door body foaming line mold frame is given:

[0029] As shown in Figure 1 , Figure 3 and Figures 5 to 7 , the mold changing station based on the annular refrigerator door body foaming line mold frame is used for the replacement operation of the mold in the foaming mold frame 8, the foaming mold frame 8 is hinged by the upper mold frame 81 and the lower mold frame 82, and the upper mold frame 81 and the lower mold frame 82 are respectively embedded with molds matched with them through screws, the mold changing station includes a support frame 1 with a door type structure composed of a square box beam 11 and a column 12, and a pair of columns 12 are respectively provided with a platform plate 1 horizontally symmetrically below the same end side of the square box beam 11; the square box beam 11 is inclined downward along one side of its short axis and suspends an electric hoist 1, and the electric hoist 1 hooks and pulls up the upper mold frame 81 of the foaming mold frame 8 in the closed state through the hook provided at the telescopic end thereof.

[0030] By adopting the above technical scheme, the mold changing station replaces the heavy labor of manually lifting the upper mold frame by two people through the setting of the electric hoist 1, the telescopic end hook of the electric hoist 1 can easily hook and pull up the upper mold frame 81 of the foaming mold frame 8 in the closed state, greatly reducing the physical consumption of the operator, and also shortening the mold replacement cycle and improving the production efficiency.

[0031] The precise control and stable lifting capacity of the electric hoist 2 effectively avoid the accidental injuries such as sprain and heavy object injury that may occur when lifting or lowering the heavy upper mold frame 81 manually, and significantly reduce the risk coefficient of the operation, thereby providing a safer working environment for the operator.

[0032] The portal structure support frame 1 composed of the box beam 11 and the column 12 is stable in structure and can bear the weight of the electric hoist 2 and the upper mold frame 81. Meanwhile, the setting of the platform plate 4 also provides an operation platform for the operator to conveniently loosen or tighten the screws on the mold.

[0033] As shown in Figure 2 , the I-beam 21 is mounted on the top surface of the box beam 11 along the short axis thereof, and the inverted L-shaped cantilever frame 22 is mounted at one end of the I-beam 21. The electric hoist 2 with an adjustable inclination angle is mounted on the lower part of the cantilever frame 22.

[0034] By adopting the above technical solution, the I-beam 21 serves as a bearing structure, which is designed to have high strength and good torsional resistance, and can bear the weight of the electric hoist 2 and its load (i.e., the upper mold frame 81), thereby ensuring the stability and reliability of the entire lifting process.

[0035] The design of the cantilever frame 22 allows the electric hoist 2 to be adjusted within a certain range in the vertical direction, i.e., the inclination angle of the electric hoist 2 is adjustable. This feature allows the operator to flexibly adjust the hooking position of the electric hoist 2 according to the actual operation requirements, thereby ensuring that the upper mold frame 81 can be accurately and stably hooked and pulled up.

[0036] Embodiment Two

[0037] In combination with Figure 1 , Figures 3 to 7 , on the basis of the above embodiment, the present embodiment further provides the following content:

[0038] In the present embodiment, as shown in Figure 1 and Figure 3 , the electric hoist 2 is suspended below the box beam 11 along the long axis thereof and can be laterally positioned and slid. The electric hoist 2 is provided with a hook at the telescopic end thereof, which can lift the mold in the foaming mold frame 8 from the lower mold frame 82 to a height at which the prongs of the external forklift can be forked.

[0039] By adopting the above technical solution, the gap between the mold and the lower mold frame 82 in the prior art is small, and the prongs of the forklift are not easy to fork in, which not only affects the work efficiency of the forklift in changing the mold, but also easily damages the mold.

[0040] The second electric hoist 3 is arranged to move horizontally to the upper side of the mold, and the hook arranged at the telescopic end of the second electric hoist 3 can cooperate with the lifting rope to lift the mold in the foaming mold frame 8 from the lower mold frame 82 to a height where the prongs of the external forklift can be easily forked, so that the forklift can easily take the mold from the lower mold frame 82 and transport it to the designated position. This design not only improves the efficiency of the forklift mold changing work, but also reduces the damage to the mold.

[0041] As shown in Figure 1 and Figures 3 to 7 , the I-beam 31 is arranged on the bottom surface of the square beam 11 along the long axis, and the I-beam 31 is arranged with a horizontal moving assembly 32; the horizontal moving assembly 32 includes two mounting plates 321 arranged vertically opposite to both sides of the I-beam 31, and a pair of T-shaped structure pulleys 323 are vertically and symmetrically arranged on the top of each mounting plate 321, the pulleys 323 are arranged to roll along the lower edge of the I-beam 31, and one of the pulleys 323 is driven to move by a motor 324 arranged on the outer side of the corresponding mounting plate 321; the two mounting plates 321 are connected by a suspension rod 322 at the bottom, and the ends of the suspension rod 322 are connected by springs 325; the second electric hoist 3 is arranged below the suspension rod 322.

[0042] By adopting the above technical scheme, the design of the horizontal moving assembly 32 enables the second electric hoist 3 to quickly and accurately adjust the position to adapt to the lifting operation of the mold;

[0043] The two mounting plates 321 of the horizontal moving assembly 32 are connected by the suspension rod 322 and the springs 325, which not only enhances the stability of the second electric hoist 3 during movement, but also can buffer and disperse the impact force generated during movement to a certain extent, ensuring the safety of the operation.

[0044] After the second electric hoist 3 is precisely positioned by the horizontal moving assembly 32, it can directly lift the mold in the foaming mold frame 8, avoiding the cumbersome process of manually lifting or transporting the mold. This not only simplifies the process of mold replacement, but also greatly improves the operation efficiency of the entire production line.

[0045] Example three

[0046] As shown in Figure 1 , Figure 5 and Figure 6 , on the basis of the above embodiment, the present embodiment further gives the following contents:

[0047] In this embodiment, a pair of columns 12 on the same side of the frame beam 11 is provided with a limiting assembly 5 at the upper part; the limiting assembly 5 includes a reinforcing beam one 51 transversely installed on the inner side of the corresponding column 12, and the inner vertical end of the reinforcing beam one 51 is vertically and symmetrically installed with a cantilever beam 52, and the end of the cantilever beam 52 is vertically and gapingly inserted with a limiting pin 53 for preventing the accidental falling of the upper die frame 81 after being lifted.

[0048] By adopting the above technical scheme, the main function of the limiting assembly 5 is to prevent the accidental falling of the upper die frame 81 lifted by the electric hoist one 2 during the mold replacement process. By vertically and gapingly inserting the limiting pin 53 at the end of the cantilever beam 52, when the upper die frame 81 is lifted to a predetermined height by the electric hoist one 2, the limiting pin 53 can be inserted into the appropriate position below the upper die frame 81, thereby forming a physical locking mechanism to ensure that the upper die frame 81 remains stable during mold replacement and will not suddenly fall due to external force or operational error, causing personal injury or equipment damage.

[0049] Since the limiting pin 53 is vertically and gapingly inserted at the end of the cantilever beam 52, the depth and position of the insertion can be adjusted according to actual conditions to adapt to different specifications of the upper die frame 81 and different mold replacement requirements. This adjustability makes the limiting assembly 5 more versatile and adaptable, and can meet the safety limiting requirements under different production conditions.

[0050] Embodiment Four

[0051] In combination Figures 1 to 3 and Figures 5 to 7 with the above embodiments, this embodiment further provides the following contents:

[0052] In this embodiment, as shown in Figure 1 and Figure 2 , the end surface of the platform plate one 4 is vertically and fixedly connected with a rotating shaft 42, and the two rotating shafts 42 are respectively and rotatably connected with a bearing seat 43 vertically installed on the inner vertical surface of the corresponding column 12.

[0053] The platform plate one 4 is divided into a horizontal state and a vertical state, and when in the horizontal state, the ends are respectively supported by a suspension plate 44 horizontally fixed on the corresponding column 12; when in the vertical state, it is detachably inserted and fixed by the positioning assembly 6 provided on the corresponding column 12 at the entrance side of the support frame 1.

[0054] By adopting the above technical scheme, the platform plate one 4 is rotatably connected to the bearing seat 43 installed on the vertical surface of the column 12 through the rotating shaft 42. This design enables the platform plate one 4 to be flexibly switched between the horizontal state and the vertical state. In the horizontal state, the platform plate one 4 provides a stable working platform for the operator, facilitating the mold replacement operation. In the vertical state, the platform plate one 4 does not occupy additional space, which is beneficial to optimizing the overall layout of the mold changing station.

[0055] When the platform plate one 4 is in the horizontal state, it is supported by the suspension plate 44, ensuring that the platform plate one 4 is stable and horizontal, providing a safe and comfortable working environment for the operator. The operator can perform mold disassembly and installation operations on the platform plate one 4 without bending over or adopting other uncomfortable postures, thereby improving the operation efficiency and convenience.

[0056] When the platform plate one 4 is not in use (i.e., in the vertical state), it can be detachably inserted and fixed on the corresponding column 12 of the entrance side of the support frame 1 through the positioning assembly 6. This design not only saves space but also avoids the random placement of the platform plate one 4 when not in use and the potential safety hazards. At the same time, the insertion and fixation of the positioning assembly 6 also ensures the stability and safety of the platform plate one 4 in the vertical state.

[0057] As shown in Figure 1 , the positioning assembly 6 includes a mounting block 61 fixed to the corresponding column 12 of the entrance side of the support frame 1. The mounting block 61 is in an inverted L-shaped structure, and a positioning pin 62 is vertically inserted into the horizontal part of the mounting block 61. The positioning pin 62 can be vertically inserted into the positioning hole 41 formed in the end of the inner side surface of the corresponding platform plate one 4.

[0058] By adopting the above technical scheme, the positioning assembly 6 is provided with the mounting block 61 and the positioning pin 62, which enables the platform plate one 4 to be conveniently positioned and fixed in the vertical state. When the platform plate one 4 needs to be in the vertical state, the operator only needs to vertically insert the positioning pin 62 into the positioning hole 41 formed in the end of the inner side surface of the corresponding platform plate one 4, and the stable fixation of the platform plate one 4 can be achieved. This design not only simplifies the operation process but also improves the positioning accuracy and fixation stability.

[0059] As shown in Figure 1 , Figure 3 , and Figures 5 to 7 , the column 12 of the support frame 1 away from the entrance side is horizontally fixed with a platform plate two 7, and the platform plate two 7 is flush with the platform plate one 4 in the horizontal state. One end of the platform plate two 7 is fixed and suspended through the horizontal and vertical reinforcing beam two 71 connected to the corresponding column 12, and the other end is fixed and supported through the step frame 72 arranged on the ground.

[0060] By adopting the technical scheme, the second platform plate 7 is flush with the first platform plate 4 in the horizontal state, thereby providing a stable working platform for the operator. When the upper mold frame 81 of the foaming mold frame 8 is lifted by the hook of the electric hoist 2, the operator can stand on the second platform plate 7 to perform the mold replacement operation, without high-altitude operation or bending operation, thereby greatly reducing the operation difficulty and labor intensity and improving the operation safety.

[0061] The second reinforcing beam 71 is transversely and vertically connected to the corresponding stand column 12, and plays a good supporting and reinforcing role on the second platform plate 7. The design enhances the structural stability of the second platform plate 7, so that the second platform plate 7 can bear greater weight and pressure, and ensures the safety of the operator when working on the platform. The setting of the ladder frame 72 enables the operator to conveniently go up and down the second platform plate 7 and the first platform plate 4.

[0062] The working principle and use process of the utility model are as follows:

[0063] In use, first, the operator pushes the foaming mold frame 8 into the support frame 1 from the inlet, and manually untwists the screws for fixing the mold in the upper mold frame 81 and the lower mold frame 82 one by one.

[0064] Then, the electric hoist 2 hooks the upper mold frame 81 of the foaming mold frame 8 in the closed state through the hook arranged at the telescopic end of the electric hoist 2, and lifts the upper mold frame 81. At this time, the limiting pin 53 in the limiting assembly 5 is inserted to prevent the upper mold frame 81 from falling accidentally, and ensure the operation safety.

[0065] Next, the electric hoist 2 is started, and the electric hoist 2 is transversely positioned and slides on the I-beam 31 through the transverse movement assembly 32, and reaches the upper position of the mold. The hook at the telescopic end of the electric hoist 2 hooks the mold to be hoisted, and lifts the mold away from the lower mold frame 82 to a height at which the external forklift can fork. The forklift then forks the old mold away, and places a new mold. After the new mold is placed, the electric hoist 2 hoists the new mold back to the lower mold frame 82, and completes the replacement of the mold.

[0066] Finally, the operator untwists the limiting pin 53 in the limiting assembly 5, and the electric hoist 2 slowly lowers the upper mold frame 81, so that the upper mold frame 81 is accurately combined with the lower mold frame 82. The operator checks and tightens the screws for fixing the mold in the upper and lower mold frames, and ensures that the mold is firmly installed.

[0067] In the whole replacement process, the operator does not need to manually lift or lower the heavy upper mold frame 81, thereby greatly reducing the labor intensity and safety hazard, and improving the operation efficiency and safety. Meanwhile, the structure of the mold replacement station is reasonable in design, simple in operation, and easy to maintain and maintain.

[0068] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mold changing station based on a ring-shaped refrigerator door body foaming line mold frame, which is used for the changing operation of the mold in the foaming mold frame (8) composed of an upper mold frame (81) and a lower mold frame (82) hinged, and the upper mold frame (81) and the lower mold frame (82) respectively embedded with a mold matched therewith through a screw, characterized in that: The die changing station comprises a portal frame support frame (1) composed of a square frame beam (11) and a pair of columns (12), a pair of platform plates (4) are respectively arranged horizontally symmetrically on the lower part of the pair of columns (12) on the same end side of the square frame beam (11); the square frame beam (11) is inclined downward along one side of its short axis and suspends an electric hoist (2), which hooks the upper die frame (81) of the closed foaming die frame (8) through the hook arranged at the telescopic end to pull and lift up the upper die frame (81).

2. The ring door line mold change station of claim 1, wherein: A I-shaped longitudinal beam (21) is installed on the top surface of the square frame beam (11) along its short axis, and a cantilever frame (22) of inverted L-shaped structure is installed at one end of the I-shaped longitudinal beam (21), and an electric hoist (2) with adjustable inclination is installed at the lower part of the cantilever frame (22).

3. The ring door line mold change station of claim 2, wherein: An electric hoist (3) that can be transversely positioned and slid is suspended below the square frame beam (11) along its long axis, and the electric hoist (3) hooks the mold in the foaming die frame (8) in the state of being ready to be hoisted through the hook arranged at the telescopic end to hoist the mold away from the lower die frame (82) to a height where the prongs of the external forklift can be forked.

4. The ring door line mold change station of claim 3, wherein: A I-shaped cross beam (31) is installed on the bottom surface of the square frame beam (11) along its long axis, and a horizontal moving assembly (32) is arranged at the lower part of the I-shaped cross beam (31); the horizontal moving assembly (32) comprises mounting plates (321) arranged vertically opposite to each other on both sides of the I-shaped cross beam (31), a pair of T-shaped structure pulleys (323) are respectively arranged vertically symmetrically on the top of each mounting plate (321), the pulleys (323) are rollingly connected to the lower side of the I-shaped cross beam (31), one pair of pulleys (323) is driven to walk by the motor (324) arranged on the outer side of the corresponding mounting plate (321); a suspension rod (322) is vertically connected between the bottoms of the two mounting plates (321), and springs (325) are respectively connected vertically symmetrically between the ends of the suspension rod (322); the electric hoist (3) is hung below the suspension rod (322).

5. The ring door body line mold change station of claim 1, wherein: A limiting assembly (5) is arranged on the upper part of the pair of columns (12) on the same side of the square frame beam (11); the limiting assembly (5) comprises a reinforcing beam (51) transversely arranged on the inner side of the corresponding column (12), and cantilever beams (52) are respectively arranged vertically symmetrically on the inner vertical surface end of the reinforcing beam (51), and limiting pins (53) for preventing the lifted upper die frame (81) from accidentally falling are vertically and gapingly arranged at the ends of the cantilever beams (52).

6. The ring door body line mold change station of claim 1, wherein: The outer side of the end surface of the platform plate (4) is respectively vertically fixedly connected with a rotating shaft (42), and the two rotating shafts (42) are respectively rotatably connected with bearing seats (43) vertically arranged on the inner vertical surface of the corresponding column (12); The platform plate (4) is divided into a horizontal state and a vertical state, when in the horizontal state, the ends thereof are respectively supported by suspension plates (44) horizontally fixed on the corresponding columns (12); when in the vertical state, the platform plate (4) is detachably inserted and fixed by the positioning assembly (6) arranged on the corresponding column (12) on the inlet side of the support frame (1).

7. The ring door body line mold change station of claim 6, wherein: The positioning assembly (6) comprises a mounting block (61) fixed on the corresponding column (12) at the entrance side of the support frame (1), the mounting block (61) is in inverted L-shaped structure, a vertical gap is inserted with a positioning pin (62) on the horizontal part, the positioning pin (62) can be vertically inserted and matched with the positioning hole (41) opened at the end of the inner side of the corresponding platform plate (4).

8. The ring door body line mold change station of claim 6, wherein: The column (12) of the support frame (1) away from the entrance side is horizontally fixed with the platform plate two (7), and the platform plate two (7) is flush with the platform plate one (4) in the horizontal state; one end side of the platform plate two (7) is fixed and suspended through the second reinforcing beam (71) transversely and vertically connected to the corresponding column (12), and the other end side is fixed and supported through the step frame (72) arranged on the ground.

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