Polyurethane foam forming mold

Abstract

The utility model relates to the technical field of forming dies, in particular to a polyurethane foam forming die. Comprising a rack, a forming die assembly, a positioning assembly and a press-fit locking assembly, the rack is provided with a mounting plate, the forming die assembly comprises a lower die mounted on the mounting plate and an upper die covering the lower die in an openable and closable mode, and the positioning assembly is located between the lower die and the upper die and used for limiting the relative positions of the lower die and the upper die; the press-fit locking assembly comprises a driving device, a mounting frame, a curved bar, a first connecting plate and a second connecting plate, the driving device and the forming die assembly are mounted on the mounting plate at intervals in the X direction, the mounting frame is arranged between the driving device and the forming die assembly, the curved bar is rotatably mounted on the mounting frame, the first connecting plate is connected with the upper die and the curved bar, and the second connecting plate is connected with the driving device and the curved bar. Rapid die assembly and self-locking of the upper die and the lower die can be achieved, manual operation is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of molding die technology, and in particular to a polyurethane foam molding die. Background Technology

[0002] Polyurethane foam is widely used in automotive interiors, furniture filling, and industrial packaging due to its lightweight, elasticity, and energy absorption properties. Its molding process typically involves injecting liquid polyurethane raw material into a mold cavity and then precisely pressing and shaping it to achieve the desired form.

[0003] In existing polyurethane foam molding technology, the mold closing operation often employs conventional methods, using mechanical snap-fit ​​structures to achieve closure between the upper and lower molds. However, this traditional polyurethane foam molding mold has many drawbacks. When locking the mold, the mechanical snap-fit ​​structure may loosen or even disengage under significant pressure, resulting in poor mold sealing and affecting the molding quality of the polyurethane foam. Furthermore, this mechanical snap-fit ​​structure is cumbersome to operate during mold opening and closing, requiring frequent manual installation and removal of the snap-fit, further reducing production efficiency. Therefore, there is an urgent need for a polyurethane foam molding mold to solve the above problems. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a polyurethane foam molding mold, which solves the technical problems of easy loosening of mechanical snap-fit ​​structure, poor sealing due to snap-fit ​​failure, and cumbersome mold opening and closing operation and low production efficiency.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A polyurethane foam molding die, comprising:

[0007] A frame, on which a mounting plate is provided;

[0008] A molding die assembly is mounted on a mounting plate. The molding die assembly includes a lower die and an upper die. The lower die is mounted on the mounting plate, and the upper die is detachably mounted on the lower die.

[0009] A positioning component is disposed between the lower mold and the upper mold, and the positioning component is used to define the relative position between the lower mold and the upper mold;

[0010] A pressing and locking assembly includes: a driving device, a mounting bracket, a crank, a first connecting plate, and a second connecting plate. The driving device is mounted on the mounting plate at a distance from the forming mold assembly in the X direction. The mounting bracket is located between the driving device and the forming mold assembly. The crank is rotatably mounted on the mounting bracket. The first connecting plate is located between the upper mold and the crank and is pivotally connected to both the upper mold and the crank. The second connecting plate is located between the driving device and the crank and is pivotally connected to both the driving device and the crank. When the upper mold is locked onto the lower mold, the first connecting plate, the crank, and the rotation pivot of the upper mold are collinear in the vertical direction. The second connecting plate, the driving device, and the rotation pivot of the crank are also collinear in the vertical direction.

[0011] Based on the above structure, the principle of the polyurethane foam molding die is as follows: the lower mold and the upper mold together form the cavity for polyurethane foam molding. First, polyurethane raw material is injected into the cavity of the lower mold. Then, the drive device is turned on, causing the output end of the drive device to extend and retract vertically. During this process, the direction of movement of the output end of the drive device is from the position near the mounting plate to the direction away from the mounting plate. Since the drive device and the crank are pivotally connected through the second connecting plate, the crank is rotatably mounted on the mounting frame. As the drive device moves upward, the second connecting plate rotates, pushing the crank to rotate around the pivot point on the mounting frame. According to the lever principle, this rotation of the crank will cause the end of the crank away from the drive device to move downward. Because the end of the crank away from the drive device is pivotally connected to the first connecting plate, and the upper mold is pivotally connected to the first connecting plate, the downward movement of the crank drives the first connecting plate to rotate around its connection point with the upper mold. During this process, the first connecting plate also rotates around the connection point between the crank and the first connecting plate. The rotation of the first connecting plate will push the upper mold... The mold moves downwards, and the upper mold gradually moves downwards under the push of the first connecting plate until the upper mold covers the lower mold. As the drive device continues to extend and retract upwards, the crank and the first connecting plate continue to rotate, and the upper mold continues to move downwards. When the upper mold and the lower mold are in close contact, pressure continues to be applied until the first connecting plate, the crank, and the rotation pivot of the upper mold are collinear in the vertical direction, and the second connecting plate, the drive device, and the rotation pivot of the crank are collinear in the vertical direction, thus completing the locking. The polyurethane raw material completes the molding process in the cavity, and finally obtains a foam product with a specific shape and size. When the foam needs to be demolded, the movable end of the drive device retracts, the upper mold disengages from the lower mold, and the molded polyurethane foam is removed. Through the synergistic action of each component in the pressing and locking assembly, the upper mold and the lower mold can be quickly closed and self-locked, reducing the tedious manual opening and closing operations and improving production efficiency. During the process of the lower mold and the upper mold closing, the positioning assembly can ensure the consistency of the position of the lower mold and the upper mold each time they are closed, thereby ensuring that the molded polyurethane foam product has stable and accurate dimensional and shape accuracy.

[0012] Furthermore, in this application, a polyurethane foam molding die includes a positioning component comprising: a set of positioning pins, wherein the positioning pins are disposed on the upper mold near the lower mold side, and the positioning pins are spaced apart circumferentially along the upper mold side; and a set of positioning grooves are provided on the lower mold near the upper mold side, wherein each positioning groove corresponds to one of the positioning pins. As a preferred embodiment of this application, when the polyurethane foam molding die needs to be closed, the upper mold moves downward, and the positioning pins on the upper mold can accurately insert into the positioning grooves of the lower mold, thereby ensuring that the positions of the lower and upper molds are accurate each time the mold is closed, preventing the upper mold from shifting during the closing process, and ensuring the accuracy of the molded product.

[0013] Furthermore, in a polyurethane foam molding mold of this application, a sealing element is provided at the contact point between the lower mold and the upper mold, and the sealing element is arranged along the circumference of the lower mold. As a preferred embodiment of this application, the sealing element in the polyurethane foam molding mold of this application is used to prevent polyurethane raw material from overflowing from the gap between the upper and lower molds under the pressure inside the cavity, reducing the possibility of polyurethane raw material leakage from the edges, avoiding the problems of raw material waste and mold contamination, and also ensuring the integrity of the polyurethane foam product shape and the accuracy of its dimensions.

[0014] Furthermore, in a polyurethane foam molding die of this application, a set of guide pillars is provided on the mounting plate. The set of guide pillars is spaced apart circumferentially along the molding die assembly. A movable plate is sleeved on the set of guide pillars. The upper die is detachably mounted on the movable plate near the molding die assembly, and the movable plate is pivotally connected to a first connecting plate on the side away from the molding die assembly. As a preferred embodiment of this application, in a polyurethane foam molding die of this application, the set of guide pillars provides multi-directional support and guidance for the movement of the movable plate, preventing the movable plate from tilting or shifting during movement, thereby ensuring the stability and accuracy of the upper die's up-and-down movement during mold closing and demolding. The upper die is detachably mounted on the movable plate, facilitating the replacement and maintenance of the upper die. When it is necessary to replace the upper die with one of different specifications or shapes, it can be quickly disassembled and installed, improving the versatility and flexibility of the die.

[0015] Furthermore, in this application, a polyurethane foam molding mold includes a mounting frame comprising a pair of uprights and a horizontal plate. The pair of uprights are spaced apart on the mounting plate in the Y direction, and the horizontal plate is positioned between the pair of uprights. The curved rod is rotatably mounted on the side of the horizontal plate near the molding mold assembly via a mounting seat. As a preferred embodiment of this application, the mounting frame and the horizontal plate form a stable frame structure in the polyurethane foam molding mold. This structure effectively supports the curved rod. During the opening and closing of the upper and lower molds, the driving device pushes the curved rod to rotate around the mounting seat. The stable structure of the mounting frame ensures that the curved rod will not wobble or shift during rotation, guaranteeing the accuracy and stability of the curved rod's rotation.

[0016] Furthermore, in a polyurethane foam molding die of this application, the crank rod has a V-shaped structure, and the turning point of the crank rod is rotatably connected to the mounting base via a rotating shaft. As a preferred embodiment of this application, the V-shaped crank rod design of the polyurethane foam molding die of this application can effectively utilize the lever principle. When the driving device pushes the crank rod to rotate through the second connecting plate, the V-shaped structure can change the direction of force transmission and amplify the force, so that a small force output by the driving device can be converted into a large downward pressure on the upper mold, thereby achieving more efficient pressing between the upper and lower molds and meeting the pressure requirements required for polyurethane foam molding.

[0017] Furthermore, in a polyurethane foam molding mold of this application, each of the pair of columns is provided with a mounting rod at the end away from the mounting plate. The mounting rod extends in the X direction, and the end of the guide column away from the mounting plate is detachably connected to the mounting rod. As a preferred embodiment of this application, the mounting rod provides an additional support point for the end of the guide column away from the mounting plate, making the guide column form a structure with both ends fixed. This enhances the overall stability of the guide column, reduces the shaking or deformation of the guide column when bearing the movement of the upper mold, effectively ensures the smoothness and accuracy of the up-and-down movement of the moving plate and the upper mold along the guide column, ensures the smooth progress of the mold closing and demolding process, and when the guide column is worn or damaged after long-term use, it can be quickly disassembled and replaced with a new guide column, reducing the maintenance cost and maintenance time of the mold and improving the utilization efficiency of the mold.

[0018] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0019] The purpose of this invention is to provide a polyurethane foam molding die. A positioning component ensures accurate mold-closing of the lower and upper molds. The coordinated operation of the driving device, mounting bracket, crank, first connecting plate, and second connecting plate in the pressing and locking assembly enables rapid mold-closing and self-locking of the upper and lower molds, reducing manual mold-opening and closing operations and improving production efficiency. A sealing element is installed at the contact point between the upper and lower molds to prevent material spillage, improving the production quality of the polyurethane foam. Furthermore, the use of an easy-to-replace and maintain upper mold mounting structure and a guide column mounting structure that enhances stability improves the molding accuracy and production efficiency of the polyurethane foam products, while reducing mold maintenance costs. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a polyurethane foam molding die according to an embodiment of this application;

[0021] Figure 2This is a schematic diagram of the structure of a polyurethane foam molding die in the locked state according to an embodiment of this application.

[0022] In the diagram: 1-Frame; 2-Mounting plate; 3-Forming mold assembly; 31-Lower mold; 310-Positioning groove; 32-Upper mold; 4-Positioning assembly; 41-Positioning column; 5-Pressure locking assembly; 51-Drive device; 52-Mounting frame; 521-Column; 522-Horizontal plate; 523-Mounting base; 524-Mounting rod; 53-Curved rod; 54-First connecting plate; 55-Second connecting plate; 6-Seal; 7-Guide column; 8-Moving plate. Detailed Implementation

[0023] like Figure 1 , 2 As shown, a polyurethane foam molding die includes:

[0024] Frame 1, on which mounting plate 2 is provided;

[0025] A molding die assembly 3 is disposed on a mounting plate 2. The molding die assembly 3 includes a lower die 31 and an upper die 32. The lower die 31 is mounted on the mounting plate 2, and the upper die 32 is closably disposed on the lower die 31.

[0026] Positioning component 4 is disposed between the lower mold 31 and the upper mold 32, and the positioning component 4 is used to define the relative position between the lower mold 31 and the upper mold 32.

[0027] The pressing and locking assembly 5 includes: a driving device 51, a mounting bracket 52, a crank 53, a first connecting plate 54, and a second connecting plate 55. The driving device 51 is mounted on the mounting plate 2 at a distance from the forming mold assembly 3 in the X direction. The mounting bracket 52 is located between the driving device 51 and the forming mold assembly 3. The crank 53 is rotatably mounted on the mounting bracket 52. The first connecting plate 54 is located between the upper mold 32 and the crank 53 and is pivotally connected to the upper mold 32 and the crank 53, respectively. The second connecting plate 55 is located between the driving device 51 and the crank 53 and is pivotally connected to the driving device 51 and the crank 53, respectively. When the upper mold 32 is locked on the lower mold 31, the rotation pivots of the first connecting plate 54, the crank 53, and the upper mold 32 are collinear in the vertical direction, and the rotation pivots of the second connecting plate 55, the driving device 51, and the crank 53 are collinear in the vertical direction.

[0028] Based on the above structure, the principle of the polyurethane foam molding die is as follows: the lower mold 31 and the upper mold 32 together form the cavity for polyurethane foam molding. First, polyurethane raw material is injected into the cavity of the lower mold 31. Then, the drive device 51 is turned on, causing the output end of the drive device 51 to extend and retract vertically. During this process, the direction of movement of the output end of the drive device 51 is from the position close to the mounting plate 2 to the direction away from the mounting plate 2. Since the drive device 51 and the crank 53 are pivotally connected through the second connecting plate 55, the crank 53 can be rotatably mounted. Mounted on the mounting bracket 52, as the drive device 51 moves upward, the second connecting plate 55 rotates, pushing the crank 53 to rotate around the pivot point on the mounting bracket 52. According to the lever principle, this rotation of the crank 53 will cause the end of the crank 53 away from the drive device 51 to move downward. Because the end of the crank 53 away from the drive device 51 is pivotally connected to the first connecting plate 54, and the upper mold 32 is pivotally connected to the first connecting plate 54, the downward movement of the crank 53 drives the first connecting plate 54 to rotate around its connection point with the upper mold 32. During this process, the first connecting plate 54 also... Rotating around the connection point between the crank 53 and the first connecting plate 54, the rotation of the first connecting plate 54 pushes the upper mold 32 downward. Under the push of the first connecting plate 54, the upper mold 32 gradually moves downward until it covers the lower mold 31. As the drive device 51 continues to extend and retract upward, the crank 53 and the first connecting plate 54 continue to rotate, and the upper mold 32 continues to move downward. When the upper mold 32 and the lower mold 31 are in close contact, pressure continues to be applied until the rotation pivot of the first connecting plate 54, the crank 53, and the upper mold 32 are collinear in the vertical direction, and the second connecting plate 5... The rotation pivots of the drive device 51 and the crank 53 are collinear in the vertical direction, completing the locking process. The polyurethane raw material completes the molding process in the cavity, ultimately obtaining a foam product with a specific shape and size. When the foam needs to be demolded, the movable end of the drive device 51 retracts, the upper mold 32 disengages from the lower mold 31, and the molded polyurethane foam is removed. During the mold closing process of the lower mold 31 and the upper mold 32, the positioning component 4 ensures that the positions of the lower mold 31 and the upper mold 32 are consistent each time the mold closes, thereby ensuring that the molded polyurethane foam product has stable and accurate dimensional and shape accuracy. The drive device 51 is a cylinder, mounted on the mounting plate 2, and the output end of the drive device 51 is pivotally connected to the second connecting plate 55.

[0029] In this embodiment, the positioning component 4 includes: a set of positioning posts 41, which are located on the side of the upper mold 32 near the lower mold 31 and spaced apart circumferentially along the upper mold 32. A set of positioning grooves 310 are provided on the side of the lower mold 31 near the upper mold 32, with each positioning groove 310 corresponding to one of the positioning posts 41. When mold closing is required, the upper mold 32 moves downward, and the positioning posts 41 on the upper mold 32 can accurately insert into the positioning grooves 310 of the lower mold 31. This ensures that the positions of the lower mold 31 and the upper mold 32 are accurate each time the mold closes, preventing the upper mold 32 from shifting during the closing process and ensuring the accuracy of the molded product. The set of positioning posts 41 consists of four posts, and correspondingly, the set of positioning grooves 310 also consists of four grooves.

[0030] In this embodiment, a sealing element 6 is provided at the contact point between the lower mold 31 and the upper mold 32, and the sealing element 6 is arranged circumferentially along the lower mold 31. The sealing element 6 is used to prevent polyurethane raw material from overflowing from the gap between the upper mold 32 and the lower mold 31 under the pressure inside the cavity, reducing the possibility of polyurethane raw material leakage from the edges, avoiding the problems of raw material waste and mold contamination, and also ensuring the integrity of the shape and the accuracy of the dimensions of the polyurethane foam product. The sealing element 6 is a rubber sealing ring.

[0031] In this embodiment, the mounting plate 2 is provided with a set of guide pillars 7, which are spaced apart circumferentially along the molding die assembly 3. A movable plate 8 is fitted onto the set of guide pillars 7. The upper die 32 is detachably mounted on the side of the movable plate 8 near the molding die assembly 3, and the side of the movable plate 8 away from the molding die assembly 3 is pivotally connected to the first connecting plate 54. The set of guide pillars 7 provides multi-directional support and guidance for the movement of the movable plate 8, preventing it from tilting or shifting during movement, thereby ensuring the stability and accuracy of the upper die 32 during mold closing and demolding. The detachable mounting of the upper die 32 on the movable plate 8 facilitates the replacement and maintenance of the upper die 32. When it is necessary to replace the upper die 32 with one of different specifications or shapes, it can be quickly disassembled and installed, improving the versatility and flexibility of the mold. The set of guide pillars 7 consists of three pillars, a design intended to facilitate the installation and removal of the upper die 32.

[0032] In this embodiment, the mounting frame 52 includes a pair of uprights 521 and a horizontal plate 522. The pair of uprights 521 are spaced apart on the mounting plate 2 in the Y direction, and the horizontal plate 522 is located between the pair of uprights 521. The curved rod 53 is rotatably mounted on the side of the horizontal plate 522 near the forming mold assembly 3 via a mounting base 523. The mounting frame 52 and the horizontal plate 522 form a stable frame structure, which can effectively support the curved rod 53. During the opening and closing of the upper mold 32 and the lower mold 31, the driving device 51 pushes the curved rod 53 to rotate around the mounting base 523. The stable structure of the mounting frame 52 can ensure that the curved rod 53 will not wobble or shift during rotation, thus ensuring the accuracy and stability of the rotation of the curved rod 53.

[0033] In this embodiment, the crank 53 has a V-shaped structure, and the turning point of the crank 53 is rotatably connected to the mounting base 523 via a rotating shaft. The design of the V-shaped crank 53 can effectively utilize the lever principle. When the driving device 51 pushes the crank 53 to rotate through the second connecting plate 55, the V-shaped structure can change the direction of force transmission and amplify the force, so that a small force output by the driving device 51 can be converted into a large downward pressure on the upper mold 32, thereby achieving more efficient pressing between the upper mold 32 and the lower mold 31 and meeting the pressure requirements required for polyurethane foam molding.

[0034] In this embodiment, each of the pair of uprights 521 is provided with a mounting rod 524 at the end away from the mounting plate 2. The mounting rod 524 extends in the X direction, and the end of the guide post 7 away from the mounting plate 2 is detachably connected to the mounting rod 524. The mounting rod 524 provides an additional support point for the end of the guide post 7 away from the mounting plate 2, making the guide post 7 form a structure with fixed ends, enhancing the overall stability of the guide post 7, reducing the shaking or deformation of the guide post 7 when bearing the movement of the upper mold 32, effectively ensuring the smoothness and accuracy of the up-and-down movement of the moving plate 8 and the upper mold 32 along the guide post 7, ensuring the smooth progress of the mold closing and demolding process, and when the guide post 7 is worn or damaged after long-term use, it can be quickly disassembled and replaced with a new guide post 7, reducing the maintenance cost and maintenance time of the mold, and improving the utilization efficiency of the mold. A pair of nuts are screwed onto the guide post 7, and the guide post 7 passes through the mounting rod 524. The pair of nuts are located at the upper and lower ends of the mounting rod 524, respectively.

[0035] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A polyurethane foam forming mold characterized by: The utility model relates to a kind of moulding die assembly and moulding die locking device, comprising: Frame (1), which is provided with mounting plate (2) on the frame (1); Forming die assembly (3), the forming die assembly (3) is equipped on mounting plate (2), and the forming die assembly (3) includes: lower die (31), upper die (32), the lower die (31) is installed on mounting plate (2), and the upper die (32) is coveringly equipped on lower die (31); Positioning assembly (4), the positioning assembly (4) is equipped between lower die (31) and upper die (32), and the positioning assembly (4) is used to limit the relative position between lower die (31) and upper die (32); Compression locking assembly (5), the compression locking assembly (5) includes: drive device (51), mounting bracket (52), crank rod (53), first connecting plate (54), second connecting plate (55), the drive device (51) is installed on mounting plate (2) in X direction and is spaced from forming die assembly (3), the mounting bracket (52) is equipped between drive device (51) and forming die assembly (3), the crank rod (53) is rotatably installed in mounting bracket (52), the first connecting plate (54) is equipped between upper die (32) and crank rod (53), and the first connecting plate (54) is respectively pivotally connected with upper die (32), crank rod (53), the second connecting plate (55) is equipped between drive device (51) and crank rod (53), and the second connecting plate (55) is respectively pivotally connected with drive device (51), crank rod (53), when the upper die (32) is locked on lower die (31), the rotating pivot of the first connecting plate (54), crank rod (53), upper die (32) is collinear in vertical direction, and the rotating pivot of the second connecting plate (55), drive device (51), crank rod (53) is collinear in vertical direction.

2. The polyurethane foam forming mold according to claim 1, characterized by: The positioning assembly (4) includes: a group of positioning columns (41), a group of the positioning columns (41) are equipped on the side of upper die (32) close to lower die (31), and a group of the positioning columns (41) are spaced along the circumference of upper die (32), and a group of positioning grooves (310) are equipped on the side of lower die (31) close to upper die (32), and the positioning groove (310) corresponds to positioning column (41) one by one.

3. The polyurethane foam forming mold according to claim 1, wherein: The abutment of the lower die (31) and the upper die (32) is provided with sealing element (6), and the sealing element (6) is arranged along the circumference of the lower die (31).

4. The polyurethane foam forming mold according to claim 1, wherein: A group of guide columns (7) are provided on the mounting plate (2), a group of the guide columns (7) are spaced along the circumference of the forming die assembly (3), a group of the guide columns (7) are provided with movable plate (8), the upper die (32) is detachably installed on the side of movable plate (8) close to the forming die assembly (3), and the side of movable plate (8) away from the forming die assembly (3) is pivotally connected with the first connecting plate (54).

5. The polyurethane foam forming mold according to claim 4, characterized in that: The mounting frame (52) comprises a pair of columns (521), a cross plate (522), the pair of columns (521) are spaced apart in the Y direction on the mounting plate (2), the cross plate (522) is arranged between the pair of columns (521), and the curved rod (53) is rotatably arranged on the side of the cross plate (522) close to the forming die assembly (3) through a mounting seat (523).

6. The polyurethane foam forming mold according to claim 5, wherein: The curved rod (53) is in a V-shaped structure, and the turning part of the curved rod (53) is rotatably connected with the mounting seat (523) through a rotating shaft.

7. The polyurethane foam forming mold according to claim 6, characterized by: The pair of columns (521) are provided with mounting rods (524) at the ends away from the mounting plate (2), the mounting rods (524) are arranged in extension in the X direction, and the guide column (7) is detachably connected with the mounting rod (524) at the end away from the mounting plate (2).

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