Water-retaining porous brick extrusion forming device

Abstract

The application provides a water-retaining porous brick extrusion forming device, and relates to the technical field of porous brick production. The device comprises an extrusion assembly, an upper die and a lower die. The extrusion assembly comprises a bottom plate, a top plate, a limiting rod, a moving sleeve and a driving unit. The bottom plate and the top plate are arranged oppositely. The bottom end of the limiting rod is connected with the bottom plate. The moving sleeve is rotatably connected with the top plate. The rod body of the limiting rod is provided with external threads. The inside of the moving sleeve is provided with internal threads matched with the external threads. The moving sleeve is sleeved on the limiting rod and is screwed with the limiting rod. The driving unit is drivingly connected with the moving sleeve and can drive the moving sleeve to rotate. The upper die is detachably connected with the bottom surface of the top plate. The bottom of the upper die is provided with a die column. The lower die is provided with a forming groove. When the moving sleeve moves along the limiting rod and approaches the bottom plate, the die column can be inserted into the forming groove, abuts against the groove wall of the forming groove and makes the upper die and the lower die fit together to form a forming die cavity. The application has high production efficiency.

Description

Technical Field

[0001] This application relates to the field of porous brick production technology, and in particular to a water-retaining porous brick extrusion molding device. Background Technology

[0002] Water-retaining porous bricks are an eco-friendly building material. Utilizing their abundant internal pores, they absorb and store large amounts of water like a sponge, slowly releasing this water for evaporative cooling, replenishing groundwater, or nourishing plants. The production of water-retaining porous bricks requires the brick blanks to be extruded and shaped using a specialized molding device.

[0003] Existing water-retaining porous brick extrusion molding devices generally include an upper mold, a lower mold, and an extrusion assembly. The upper and lower molds are fixedly connected to the extrusion assembly. Users can first drive the upper and lower molds to approach each other and assemble them through the extrusion assembly to form a molding cavity that is compatible with the water-retaining porous brick. Then, the molding device is placed in a brick kiln for heating to form the brick blank.

[0004] However, since a set of water-retaining porous brick extrusion molding equipment can only be used to fire one water-retaining porous brick in a short period of time, in order to ensure sufficient production efficiency, users must prepare a large number of water-retaining porous brick extrusion molding equipment, which makes the use cost of existing water-retaining porous brick extrusion molding equipment high.

[0005] In view of this, there is a need to provide a water-retaining porous brick extrusion molding device. Utility Model Content

[0006] To address the problem that existing water-retaining porous brick extrusion molding devices require multiple units when simultaneously extruding multiple brick blanks, resulting in high operating costs, this application provides a water-retaining porous brick extrusion molding device.

[0007] This application provides a water-retaining porous brick extrusion molding device, which adopts the following technical solution: it includes an extrusion assembly, an upper die and a lower die. The extrusion assembly includes a bottom plate, a top plate, a limiting rod, a movable sleeve and a driving unit. The bottom plate and the top plate are arranged opposite each other. The bottom end of the limiting rod is connected to the bottom plate. The movable sleeve is rotatably connected to the top plate. The limiting rod has an external thread on its body. The movable sleeve has an internal thread that matches the external thread. The movable sleeve is sleeved on the limiting rod and screwed to the limiting rod. The driving unit is connected to the movable sleeve and can drive the movable sleeve to rotate. The upper mold is detachably connected to the bottom surface of the top plate, and the bottom of the upper mold is provided with mold pillars; The lower mold has a forming groove. When the movable sleeve approaches the bottom plate along the limiting rod, the mold column can be inserted into the forming groove and abut against the groove wall, so that the upper mold and the lower mold are assembled, and a forming cavity adapted to the water-retaining porous brick is formed between the upper mold and the lower mold.

[0008] By adopting the above technical solution, the moving sleeve of the extrusion assembly can rotate under the drive unit and move up and down along the limiting rod, thereby driving the upper die to move closer to or away from the lower die to achieve the assembly and separation of the upper and lower dies, facilitating the rapid formation of the molding cavity and making operation convenient. Compared with the shortcomings of existing water-retaining porous brick extrusion molding devices, which can only be used to fire one water-retaining porous brick in a short time, require a large number of devices to ensure production efficiency, and have high operating costs, this water-retaining porous brick extrusion molding device can achieve the extrusion molding of a large number of upper and lower dies in a short time, which reduces the equipment operating cost and improves production efficiency.

[0009] Specifically, the drive unit includes an internal gear ring, planetary gears, and a crank handle. The internal gear ring is rotatably connected to the top surface of the top plate around the central axis of the limiting rod. The planetary gears are rotatably connected to the top surface of the top plate. A sun gear is connected to the top of the movable sleeve. Both the sun gear and the internal gear ring mesh with the planetary gears. The crank handle is connected to the top ring surface of the internal gear ring.

[0010] By adopting the above technical solution, the drive unit uses an internal gear ring, planetary gears, a crank handle, planetary gears, and a sun gear. Utilizing the transmission characteristics of the planetary gear system, when the crank handle is turned, driving the internal gear ring to rotate, power is transmitted through the planetary gears, causing the movable sleeve connected to the sun gear to rotate. This transmission method effectively amplifies torque, allowing operators to drive the movable sleeve to rotate with less force when turning the crank handle, making operation more labor-saving. Furthermore, the compact structure of the planetary gear system helps reduce the overall space occupied by the device, improving its space utilization. Simultaneously, it achieves smooth transmission, ensuring stable rotation of the movable sleeve, thereby enabling the upper and lower molds to accurately assemble and form the molding cavity, improving the precision and quality of the extrusion molding of water-retaining porous bricks.

[0011] Furthermore, a rotating hole is provided on the top plate, the bottom end of the movable sleeve extends through the rotating hole to the bottom of the top plate, and a limiting protrusion is formed on the outer side wall of the movable sleeve. The limiting protrusion can abut against the bottom plate surface of the top plate, and the planetary gear can abut against the top plate surface of the top plate. The top plate has an annular groove that fits the internal gear ring. The bottom annular surface of the internal gear ring is inserted into the annular groove, and a thrust ball bearing abuts between the internal gear ring and the bottom wall of the annular groove. A limiting groove is also formed on the side wall of the annular groove along the circumference of the annular groove. An abutting protrusion is provided on the outer wheel surface of the internal gear ring. The abutting protrusion is inserted into the limiting groove and abuts against the groove wall of the limiting groove and can slide along the limiting groove.

[0012] By adopting the above technical solution, the rotating hole allows the movable sleeve to pass through, enabling it to rotate flexibly relative to the top plate. The limiting protrusion abuts against the bottom surface of the top plate to prevent the movable sleeve from detaching from the top plate, ensuring stable installation of the movable sleeve. The planetary gear abuts against the top surface of the top plate, helping to stabilize the position of the planetary gear and ensuring the stability of the gear transmission. The annular groove provides rotation space for the internal gear ring, which can rotate around the central axis of the limiting rod. The thrust ball bearing can effectively bear the axial load, reducing friction during the rotation of the internal gear ring and lowering energy consumption. The limiting groove, in conjunction with the abutting protrusion, can limit and guide the rotation of the internal gear ring, making its rotation smoother and preventing it from shifting during rotation. This ensures the stable operation of the entire drive unit, enabling the extrusion assembly to stably drive the upper and lower dies to assemble, improving the reliability and service life of the water-retaining porous brick extrusion molding device.

[0013] Furthermore, gaskets are provided between the planetary gear and the top surface of the top plate, and between the bottom surface of the top plate and the limiting protrusion.

[0014] By adopting the above technical solution, shims are set between the planetary gear and the top plate of the top plate, and between the bottom plate of the top plate and the limiting protrusion. This can reduce the direct friction between the planetary gear and the limiting protrusion and the top plate, reduce the wear of components, extend the service life of the device, and also help reduce the noise during the rotation of the moving sleeve and improve the stability of the device operation.

[0015] Specifically, the top plate includes a fixed hook, a movable hook, a guide rod, and an elastic element. The handle end of the fixed hook is located on the bottom surface of the top plate. A guide groove is formed on the side edge of the top plate along the direction from near to away from the fixed hook. One end of the guide rod is inserted into the guide groove and can slide along the guide groove. The other end of the guide rod is connected to the movable hook. The elastic element is located between the end of the guide rod away from the movable hook and the inner wall of the guide groove. The elastic element can apply a force to the guide rod close to the fixed hook. When the movable hook approaches the fixed hook, the hook ends of both the movable hook and the fixed hook can abut against the bottom of the upper mold, and the upper mold is abutted between the movable hook and the fixed hook.

[0016] By adopting the above technical solution, the fixed hook, movable hook, guide rod, and elastic element set on the top plate form a structure that facilitates the installation and disassembly of the upper mold. The elastic element applies a force close to the fixed hook to the guide rod, causing the movable hook to move closer to the fixed hook and abut the hook ends of both against the bottom of the upper mold. The handles of both hold the upper mold between them, achieving stable installation of the upper mold.

[0017] Specifically, the top surface of the base plate has countersunk holes that are adapted to the lower mold.

[0018] By adopting the above technical solution, a countersunk hole adapted to the lower mold is opened on the top of the base plate, which can achieve stable placement of the lower mold on the base plate.

[0019] Furthermore, the bottom of the lower mold has a discharge hole leading to the molding cavity, and the bottom wall of the countersunk hole has a receiving hole corresponding to the discharge hole. The diameter of the receiving hole gradually decreases in the direction from approaching to moving away from the lower mold.

[0020] By adopting the above technical solution, the design of the discharge hole and the receiving hole can facilitate the discharge of excess brick blanks in the forming mold cavity when the upper mold and the lower mold are closed; the structure of the gradually decreasing diameter of the receiving hole can play a certain role in restricting the brick blanks when they leave the forming mold cavity, so that the brick blanks in the forming mold cavity are more compact, which is conducive to improving the forming quality of the brick blanks.

[0021] Specifically, the lower mold also includes a hook and loop fastener, the handle of which is hinged to the outer side wall of the lower mold. When the upper mold and the lower mold are assembled, the hook end of the hook and loop fastener can abut against the side of the upper mold away from the lower mold, thereby abutting the upper mold between the hook and the lower mold.

[0022] By adopting the above technical solution, the buckle can stably abut the upper mold against the lower mold when the upper and lower molds are assembled, so that the upper and lower molds can still maintain the assembled state when the upper and lower molds are separated from the extrusion components, which is convenient for the subsequent brick firing process.

[0023] In summary, this application includes the following beneficial technical effects: The device includes an extrusion assembly, an upper die, and a lower die. The extrusion assembly includes a base plate, a top plate, a limiting rod, a movable sleeve, and a drive unit. The base plate and the top plate are arranged opposite each other. The bottom end of the limiting rod is connected to the base plate. The movable sleeve is rotatably connected to the top plate. The limiting rod has an external thread, and the movable sleeve has an internal thread that matches the external thread. The movable sleeve is fitted onto the limiting rod and screwed to it. The drive unit is connected to the movable sleeve and can drive the movable sleeve to rotate. The upper die is detachably connected to the bottom plate of the top plate. The upper mold has a mold column at its bottom, while the lower mold has a forming groove. When the moving sleeve approaches the bottom plate along the limiting rod, the mold column can be inserted into the forming groove and abut against the groove wall, thus assembling the upper and lower molds. A forming cavity adapted to the water-retaining porous brick is formed between the upper and lower molds. This allows the moving sleeve of the extrusion assembly to rotate under the drive unit and move up and down along the limiting rod, thereby moving the upper mold closer to or away from the lower mold to achieve the assembly and separation of the upper and lower molds. This facilitates the rapid formation of the forming cavity and is easy to operate. Compared to existing water-retaining porous brick extrusion molding devices, which can only be used to fire one water-retaining porous brick in a short time, require a large number of devices to ensure production efficiency, and have high operating costs, this water-retaining porous brick extrusion molding device can extrude and mold a large number of upper and lower molds in a short time, reducing equipment operating costs and improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a perspective view of a water-retaining porous brick extrusion molding device according to this application; Figure 2 It is along Figure 1 A schematic cross-sectional view taken along the central axis of the middle limiting post along its length.

[0025] Reference numerals: 1. Extrusion assembly; 11. Base plate; 111. Receiving hole; 112. Guide post; 12. Top plate; 121. Fixing hook; 122. Moving hook; 123. Guide rod; 124. Elastic element; 13. Limiting rod; 14. Moving sleeve; 141. Sun gear; 142. Limiting protrusion; 143. Gasket; 15. Drive unit; 151. Internal gear ring; 152. Planetary gear; 153. Handle; 2. Upper die; 21. Die pillar; 3. Lower die; 31. Buckle. Detailed Implementation

[0026] Figure 1 This is a perspective view of an extrusion molding apparatus for water-retaining porous bricks according to this application. Figure 2 along Figure 1 A schematic cross-sectional view taken along the central axis of the middle limiting post along its length. See also... Figure 1 and Figure 2The water-retaining porous brick extrusion molding device provided in this application includes: an extrusion assembly 1, two upper dies 2 and two lower dies 3, with each upper die 2 corresponding to one of the two lower dies 3. Each upper die 2 has multiple die pillars 21 spaced parallel to each other at its bottom. Each lower die 3 has a molding groove and multiple discharge holes leading to the molding cavity at its bottom. The die pillars 21 correspond one-to-one with the discharge holes. When the upper dies 2 and lower dies 3 are assembled, each die pillar 21 is inserted into a corresponding discharge hole and discharged. The inner walls of the holes abut against each other, so that a molding cavity suitable for water-retaining porous bricks is formed between the upper mold 2 and the lower mold 3. Each of the four side walls of the lower mold 3 is provided with a buckle 31, and the handle end of each buckle 31 is hinged to the outer side wall of the lower mold 3. When the upper mold 2 and the lower mold 3 are assembled, the hook end of each buckle 31 can abut against the side of the upper mold 2 away from the lower mold 3, and abut against the upper mold 2 between the buckle 31 and the lower mold 3, so that the upper mold 2 and the lower mold 3 can still maintain the assembled state during the subsequent brick firing process.

[0027] See Figure 1 and Figure 2 The extrusion assembly 1 includes a base plate 11, a top plate 12, a limiting rod 13, a movable sleeve 14, and a drive unit 15. The base plate 11 and the top plate 12 are arranged vertically opposite each other. The bottom end of the limiting rod 13 is connected to the base plate 11. The rod body of the limiting rod 13 is provided with an external thread. The interior of the movable sleeve 14 is provided with an internal thread that matches the external thread. The movable sleeve 14 is sleeved on the limiting rod 13 and screwed to the limiting rod 13. A countersunk hole adapted to the lower die 3 is opened on the top surface of the base plate 11 so that the lower die 3 can be stably placed on the base plate 11. A receiving hole 111 corresponding to the discharge hole is opened on the bottom wall of the countersunk hole. The diameter of the receiving hole 111 increases from near to far. The diameter of the upper mold 2 gradually decreases in the direction away from the lower mold 3, so that when the upper mold 2 and the lower mold 3 are closed, the excess brick blank in the forming cavity can be discharged along the discharge hole and the receiving hole 111. The structure of the receiving hole 111 with the gradually decreasing diameter can play a certain role in restricting the brick blank when leaving the forming cavity, so that the brick blank in the forming cavity is more compact, which is beneficial to improving the forming quality of the brick blank. A rotating hole is provided in the middle of the top plate 12. The top plate 12 is provided with two sets of connecting parts for detachably connecting the two upper molds 2. The two sets of connecting parts are symmetrically arranged with the rotating hole as the center. Each set of connecting parts includes a fixed hook 121, a moving hook 122, a guide rod 123 and an elastic element 124.

[0028] See Figure 1 and Figure 2In a set of connectors: the handle end of the fixed hook 121 is located on the bottom plate surface of the top plate 12, and a guide groove is provided on the side plate edge of the top plate 12 along the direction from near to far from the fixed hook 121. One end of the guide rod 123 is inserted into the guide groove and can slide along the guide groove. The other end of the guide rod 123 is connected to the movable hook 122. The elastic member 124 is located between the end of the guide rod 123 away from the movable hook 122 and the inner wall of the guide groove. The elastic member 124 can apply a force close to the fixed hook 121 to the guide rod 123. When the movable hook 122 is close to the fixed hook 121, the hook ends of both the movable hook 122 and the fixed hook 121 can abut against the bottom of the upper mold 2 and abut against the corresponding upper mold 2 between the movable hook 122 and the fixed hook 121, so that the upper mold 2 and the top plate 12 can be detachably connected through the connectors.

[0029] See Figure 1 and Figure 2 The drive unit 15 includes an internal gear ring 151, three planetary gears 152, and a crank 153. An annular groove is formed around the central axis of the limiting rod 13 on the top of the top plate 12. The bottom annular surface of the internal gear ring 151 is inserted into the annular groove, and a thrust ball bearing abuts between the internal gear ring 151 and the bottom wall of the annular groove. A limiting groove is also formed around the circumference of the annular groove on its side wall. An abutting protrusion is provided on the outer surface of the internal gear ring 151, which abuts against the groove wall of the limiting groove and can slide along the limiting groove, allowing the internal gear ring 151 to rotate around the central axis of the limiting rod 13 and be connected to the top plate surface of the top plate 12. The three planetary gears 152 are all rotatably connected to the top plate surface of the top plate 12. The top end of the movable sleeve 14 is fixedly connected (can...). (It is welded) There is a sun gear 141. The sun gear 141 and the internal gear ring 151 are simultaneously engaged with three planet gears 152. The crank handle 153 is connected to the top ring surface of the internal gear ring 151. The bottom end of the movable sleeve 14 extends through the rotating hole to the bottom of the top plate 12. The outer side wall of the movable sleeve 14 forms a limiting protrusion 142. The limiting protrusion 142 can abut against the bottom plate surface of the top plate 12. The planet gears can abut against the top plate surface of the top plate 12. When the user turns the crank handle 153 to drive the internal gear ring 151 to rotate, the power can be transmitted through the planet gears to make the movable sleeve 14 connected to the sun gear 141 rotate. Then the movable sleeve 14, along the length direction of the limiting rod 13, moves the top plate 12 and the upper mold 2 closer to the bottom plate 11, so that the two upper molds 2 can simultaneously assemble with the corresponding lower molds 3. This transmission method can effectively amplify the torque, allowing the operator to drive the moving sleeve 14 to rotate with a smaller force by turning the crank 153, making operation more labor-saving; and the planetary gear system has a compact structure, which helps to reduce the overall space occupied by the device and improve the space utilization of the device; at the same time, it can achieve smooth transmission, ensuring the stable rotation of the moving sleeve 14, thereby enabling the upper mold 2 and the lower mold 3 to accurately assemble into the forming cavity, improving the precision and quality of water-retaining porous brick extrusion molding.

[0030] Specifically, gaskets 143 can be provided between the planetary gear and the top surface of the top plate 12, and between the bottom surface of the top plate 12 and the limiting protrusion 142. This can reduce the direct friction between the planetary gear and the limiting protrusion 142 and the top plate 12, reduce the wear of components, extend the service life of the device, and also help reduce the noise during the rotation of the moving sleeve 14 and improve the stability of the device operation. Furthermore, a guide post 112 can be provided at each of the four corners of the base plate 11, and four guide holes can be opened on the top plate accordingly. Each guide post 112 is inserted into a corresponding guide hole and can slide along the guide hole, so that the movement of the moving sleeve 14 on the limiting rod 13 can be guided by the cooperation of the guide hole and the guide post 112.

[0031] The working principle of the water-retaining porous brick extrusion molding device of this application is as follows: The moving sleeve 14 of the extrusion assembly 1 can rotate under the drive of the drive unit 15 and move up and down along the limiting rod 13, thereby driving the upper die 2 to move closer to or away from the lower die 3 to achieve the assembly and separation of the upper die 2 and the lower die 3, which facilitates the rapid formation of the molding cavity and is easy to operate. Compared with the shortcomings of existing water-retaining porous brick extrusion molding devices, which can only be used to fire one water-retaining porous brick in a short time, require a large number of devices to ensure production efficiency, and have high operating costs, this water-retaining porous brick extrusion molding device can achieve the extrusion molding of a large number of upper dies 2 and lower dies 3 in a short time, which reduces the operating cost of the equipment and improves the production efficiency.

[0032] It should be noted that the above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water-retaining porous brick extrusion molding device, characterized in that: The device includes an extrusion assembly (1), an upper die (2), and a lower die (3). The extrusion assembly (1) includes a base plate (11), a top plate (12), a limiting rod (13), a movable sleeve (14), and a drive unit (15). The base plate (11) and the top plate (12) are arranged opposite each other. The bottom end of the limiting rod (13) is connected to the base plate (11). The movable sleeve (14) is rotatably connected to the top plate (12). The limiting rod (13) has an external thread on its body. The movable sleeve (14) has an internal thread that matches the external thread. The movable sleeve (14) is sleeved on the limiting rod (13) and screwed to the limiting rod (13). The drive unit (15) is connected to the movable sleeve (14) and can drive the movable sleeve (14) to rotate. The upper mold (2) is detachably connected to the bottom plate of the top plate (12), and the bottom of the upper mold (2) is provided with a mold column (21); The lower mold (3) has a forming groove. When the movable sleeve (14) approaches the bottom plate (11) along the limiting rod (13), the mold column (21) can be inserted into the forming groove and abut against the groove wall, so that the upper mold (2) and the lower mold (3) are joined together, and a forming cavity adapted to the water-retaining porous brick is formed between the upper mold (2) and the lower mold (3).

2. The water-retaining porous brick extrusion molding device according to claim 1, characterized in that: The drive unit (15) includes an internal gear ring (151), planetary gears (152) and a rocker arm (153). The internal gear ring (151) is rotatably connected to the top plate of the top plate (12) around the central axis of the limiting rod (13). The planetary gears (152) are rotatably connected to the top plate of the top plate (12). The top end of the movable sleeve (14) is connected to a sun gear (141). Both the sun gear (141) and the internal gear ring (151) mesh with the planetary gears (152). The rocker arm (153) is connected to the top ring surface of the internal gear ring (151).

3. The water-retaining porous brick extrusion molding device according to claim 2, characterized in that: The top plate (12) is provided with a rotating hole, and the bottom end of the movable sleeve (14) extends through the rotating hole to the bottom of the top plate (12). The outer side wall of the movable sleeve (14) forms a limiting protrusion (142), which can abut against the bottom plate surface of the top plate (12), and the planetary gear can abut against the top plate surface of the top plate (12). The top plate (12) has an annular groove that is adapted to the internal gear ring (151). The bottom annular surface of the internal gear ring (151) is inserted into the annular groove, and a thrust ball bearing abuts between the internal gear ring (151) and the bottom wall of the annular groove. A limiting groove is also formed on the side wall of the annular groove along the circumference of the annular groove. The outer wheel surface of the internal gear ring (151) is provided with an abutting protrusion. The abutting protrusion is inserted into the limiting groove and abuts against the groove wall of the limiting groove and can slide along the limiting groove.

4. The water-retaining porous brick extrusion molding device according to claim 3, characterized in that: Gaskets (143) are provided between the planetary gear and the top surface of the top plate (12) and between the bottom surface of the top plate (12) and the limiting protrusion (142).

5. The water-retaining porous brick extrusion molding device according to claim 1, characterized in that: The top plate (12) includes a fixed hook (121), a movable hook (122), a guide rod (123), and an elastic element (124). The handle end of the fixed hook (121) is located on the bottom plate surface of the top plate (12). A guide groove is formed on the side plate edge of the top plate (12) along the direction from near to away from the fixed hook (121). One end of the guide rod (123) is inserted into the guide groove and can slide along the guide groove. The other end of the guide rod (123) is connected to the movable hook (122). The elastic element (124) 4) The guide rod (123) is located between the end away from the movable hook (122) and the inner wall of the guide groove, and the elastic member (124) can apply a force close to the fixed hook (121) to the guide rod (123). When the movable hook (122) is close to the fixed hook (121), the hook ends of the movable hook (122) and the fixed hook (121) can abut against the bottom of the upper mold (2) and abut against the upper mold (2) between the movable hook (122) and the fixed hook (121).

6. The water-retaining porous brick extrusion molding device according to claim 1, characterized in that: The top surface of the base plate (11) is provided with a countersunk hole that is compatible with the lower mold (3).

7. The water-retaining porous brick extrusion molding device according to claim 6, characterized in that: The bottom of the lower mold (3) is provided with a discharge hole leading to the molding cavity, and the bottom wall of the countersunk hole is provided with a receiving hole (111) corresponding to the discharge hole. The diameter of the receiving hole (111) gradually decreases in the direction from approaching to moving away from the lower mold (3).

8. The water-retaining porous brick extrusion molding device according to claim 1, characterized in that: The lower mold (3) also includes a buckle (31), the handle of which is hinged to the outer side wall of the lower mold (3). When the upper mold (2) and the lower mold (3) are assembled, the hook end of the buckle (31) can abut against the side of the upper mold (2) away from the lower mold (3), and abut the upper mold (2) between the buckle (31) and the lower mold (3).

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