A die pressing capping machine and its capping die

Abstract

A die-casting capping machine and a capping die provided by the present invention. The capping die includes an upper die and a lower die. The upper die is provided with a first water circulation component and a second water circulation component at the axis of a cylindrical pipe sleeve. The first water circulation component includes a spiral water circulation core and an upper die water isolation sleeve sleeved outside the spiral water circulation core. The spiral water circulation core is connected to an inner sleeve pipe to form a first liquid inlet flow channel, and the upper die water isolation sleeve is communicated with an outer sleeve pipe to form a first liquid return flow channel. The second water circulation component includes a threaded core sleeve sleeved outside the upper die water isolation sleeve. A snake-shaped coiled core cooling flow channel is formed at the lower end inside the core wall of the threaded core sleeve, which improves the service life of internal parts of the die, improves the speed and cooling effect, and thus improves the production efficiency. The die-casting capping machine adopts this capping die, effectively reducing the failure rate caused by the capping die during the production process of the machine, and at the same time improving the production efficiency and quality of the whole die-casting capping machine for producing bottle caps.

Description

Technical Field

[0001] The present invention relates to the field of capping machine equipment, and particularly to a die pressing capping machine and its capping die. Background Art

[0002] China is a major country in packaging manufacturing and consumption in the world. The proportion of plastic packaging in the total output value of the packaging industry has exceeded 30%, becoming a main force in the packaging industry and playing an irreplaceable role in various fields such as food, beverages, daily necessities, and industrial and agricultural production. In recent years, the packaging products and packaging materials in the plastic packaging industry have grown steadily, and new packaging materials, new processes, new technologies, and new products have emerged continuously. Nowadays, for various beverages, cosmetics, medicines, etc., most of their packaging adopts plastic packaging, and plastic bottle caps are indispensable for plastic bottle structures, and plastic bottle caps often need to be produced separately.

[0003] There are various types of machine equipment for manufacturing plastic bottle caps, among which die pressing capping machines are the most commonly used. Currently, all die pressing capping machines have a pressing module, which includes a rotating main body and an upper die and a bottom die arranged on the rotating main body. The upper die has a cooling device. In the prior art, the structural design of the cooling device is relatively unreasonable, and the cooling effect is not good. For example, Figure 1 in a cooling structure for an upper die described in Figure 1 it uses the combination of two parts (such as the combination of A1 and A2 in Figure 1 ) and transports cooling water through the gap between the two parts (such as the D position in Figure 1 ) for cooling. In order to achieve the formation of the side wall of the bottle cap thread, this structural design ultimately results in a thin wall thickness at the formed part of the side wall of the thread (as shown at the B position in Figure 1 ), there are many stress concentration points (as shown at the C position in ). Splitting into two parts weakens the strength of the two parts, and it is easy to deform and fail during the mold closing and demolding processes, shortening the part life, resulting in a shorter service life of the entire mold, increased maintenance costs, and reduced production efficiency. At the same time, the split-flow cooling structure adopted in the prior art leads to uneven water flow of the transported cooling water and insufficient cooling, ultimately affecting the product quality.

[0004] In view of the above situation, the present invention provides a capping die with a long service life, good cooling effect, and high product forming quality.

[0005] The present invention also provides a die pressing capping machine that uses the capping die, reduces the failure rate, lowers the maintenance cost, and improves the production efficiency.

[0006] To achieve this object, the present invention provides a cap-making mold for preparing a bottle cap. The bottle cap includes an inner side and an outer side opposite to the inner side. The inner side includes a bottom and a threaded side wall formed around the bottom in its circumferential direction. The cap-making mold includes: an upper mold and a lower mold. An upper mold surface of the upper mold and a lower mold surface of the lower mold cooperate to form a mold cavity for molding the bottle cap. The upper mold further includes: an upper mold body including a cylindrical tube sleeve and a fixed mounting member, and the fixed mounting member is installed at the upper end of the cylindrical tube sleeve; a cooling module for cooling and shaping the bottle cap in the mold cavity, which includes a first water delivery assembly and a second water delivery assembly; the first water delivery assembly is arranged at the axis of the cylindrical tube sleeve and includes a guiding water core, a spiral water delivery core, an upper mold water isolation sleeve and a joint. The guiding water core includes an inner sleeve and an outer sleeve, and the outer sleeve is coaxially sleeved outside the inner sleeve. A lower end of the inner sleeve is sealingly connected to an upper end of the spiral water delivery core. A first liquid inlet channel is formed by penetrating an upper end surface of the inner sleeve to a lower end surface of the spiral water delivery core. The upper mold water isolation sleeve is sleeved outside the spiral water delivery core and is sealingly installed with the outer sleeve. A cooling cavity is formed between an inner wall of the upper mold water isolation sleeve and the lower end surface of the spiral water delivery core. A first liquid return channel is jointly formed between the inner wall of the upper mold water isolation sleeve and the outer wall of the spiral water delivery core and between the inner wall of the outer sleeve and the outer wall of the inner sleeve; the joint includes a first liquid inlet and a first liquid return port, the first liquid inlet is communicated with the first liquid inlet channel, and the first liquid return port is communicated with the first liquid return channel; the second water delivery assembly includes a liquid inlet pipe, a liquid return pipe and a threaded core. The threaded core is sleeved outside the upper mold water isolation sleeve. The threaded core includes a cylindrical wall body, and a thread groove is recessed on an outer side of a lower end of the cylindrical wall body for molding the threaded side wall of the bottle cap. A second liquid inlet and a second liquid return port are opened on an upper end surface of the cylindrical wall body. The second liquid inlet and the second liquid return port respectively extend downward along the cylindrical wall body to form a second liquid inlet channel and a second liquid return channel. A core cooling channel that is serpentinely coiled along the circumferential direction of the cylindrical wall body is formed at a lower end inside the cylindrical wall body, and the core cooling channel is respectively communicated with the second liquid inlet channel and the second liquid return channel; the liquid inlet pipe and the liquid return pipe penetrate through the joint and extend downward into the cylindrical tube sleeve and are respectively communicated with the second liquid inlet and the second liquid return port; and an ejection module including an air flow assisted ejection structure, the air flow assisted ejection structure includes an air inlet nozzle and an air flow channel, and the air flow channel extends to the mold cavity for assisting in blowing out the bottle cap.

[0007] Preferably, the lower mold includes a mold base and a third water circulation component. The third water circulation component is arranged inside the mold base and includes a lower mold water insulation sleeve. A third liquid inlet is formed in the middle of the bottom surface of the lower mold water insulation sleeve close to the mold base. The third liquid inlet extends into the lower mold water insulation sleeve to form a lower mold cooling channel. A third liquid return port is formed at the end of the lower mold cooling channel in the lower mold water insulation sleeve. The lower mold water insulation sleeve is installed inside the mold base and cooperates with the mold base to form the lower mold surface for adapting to the outer side of the bottle cap. A third liquid inlet channel and a third liquid return channel are respectively penetrated through the mold base. The third liquid inlet channel is communicated with the third liquid inlet, and the third liquid return channel is communicated with the third liquid return port. Therefore, the third water circulation component is arranged in the lower mold and cooperates with the first water circulation component and the second water circulation component of the upper mold to jointly cool the mold cavity, greatly shortening the cooling and shaping time of the bottle cap and thus improving the production efficiency.

[0008] Further, the lower mold cooling channel is in a vortex shape inside the bottom of the lower mold water insulation sleeve and in a serpentine winding shape inside the side wall of the lower mold water insulation sleeve. The vortex-shaped lower mold cooling channel inside the bottom of the lower mold water insulation sleeve is used to realize the cooling and shaping of the bottom of the outer side of the bottle cap, and the serpentine winding-shaped lower mold cooling channel inside the side wall of the lower mold water insulation sleeve is used to realize the side wall cooling and shaping of the bottle cap. The lower mold cooling channel adopts a single-direction cooling channel structure of vortex shape and serpentine winding shape, avoiding problems such as uneven flow velocity and flow rate and poor cooling effect existing in traditional split cooling, thus improving the cooling effect and product quality.

[0009] Preferably, the spiral water circulation core includes a convex ring part and a spiral convex part. The convex ring part is located on the outer side of the lower end of the spiral water circulation core. A predetermined number of diversion grooves are evenly arranged in a concave manner on the circumferential side surface of the convex ring part. The spiral convex part is formed on the outer side of the spiral water circulation core and is located above the convex ring part. The spiral convex part is tangent to the inner wall of the upper mold water insulation sleeve.

[0010] Preferably, the upper ends of the inner sleeve and the outer sleeve both extend into the joint and are hermetically connected to the joint.

[0011] Preferably, a through hole that is in clearance fit with the liquid inlet pipe and the liquid return pipe respectively is penetrated through the joint.

[0012] Preferably, a pair of first springs are arranged between the joint and the fixed mounting part to support and buffer the joint.

[0013] Preferably, a second spring is arranged between the fixed mounting part and the cylindrical pipe sleeve to provide forming pressure and be used for the reset of the upper mold after mold opening.

[0014] Preferably, a third spring is sleeved outside the upper end of the threaded core to realize the reset of the threaded core.

[0015] The present invention also provides a die pressing capping machine, which includes a frame, a feeding module, an extrusion module and a pressing module arranged on the frame. The pressing module includes a rotating body and a predetermined number of compression molding dies arranged on the rotating body. It is characterized in that the compression molding die is the above-mentioned capping die.

[0016] The beneficial effects of the present invention:

[0017] A cap-making mold provided by the present invention includes an upper mold and a lower mold. The upper mold is provided with a first water circulation component and a second water circulation component at the axis of a cylindrical pipe sleeve. The first water circulation component includes a guiding water core, a spiral water core, an upper mold water isolation sleeve and a joint. The guiding water core includes an outer sleeve pipe and an inner sleeve pipe arranged coaxially. One lower end of the inner sleeve pipe is connected to one upper end of the spiral water core. A first liquid inlet channel is formed by penetrating one upper end surface of the inner sleeve pipe to one lower end surface of the spiral water core. The upper mold water isolation sleeve is sleeved outside the spiral water core and is sealed and installed with the outer sleeve pipe. A cooling cavity is formed between the inner wall of the upper mold water isolation sleeve and the lower end surface of the spiral water core. This cooling cavity is used to realize the bottom cooling and shaping of the inner side of the bottle cap, and at the same time can provide cooling for the threaded side wall of the bottle cap. A first liquid return channel is jointly formed between the inner wall of the upper mold water isolation sleeve and the outer wall of the spiral water core and between the inner wall of the outer sleeve pipe and the outer wall of the inner sleeve pipe. The first liquid return channel passes through the spiral water core with a spiral structure, and the return water is unidirectional and spiral, avoiding the problem that the traditional split cooling structure causes uneven water flow of the transported cooling water and insufficient cooling. The first water circulation component transports the cooling water through a pipe-in-pipe type. This design forms a convection of the low-temperature cooling water in the first liquid inlet channel and the heated cooling water in the first liquid return channel in terms of structure, thereby realizing the function of mutual heat exchange, so that the heated cooling water circulating back along the first liquid return channel is appropriately cooled. While ensuring the cooling effect, the first water circulation component reduces the work done by external equipment to cool the heated cooling water, reduces energy consumption, and thus reduces production costs. At the same time, the second water circulation component includes a threaded core sleeve outside the upper mold water isolation sleeve. A thread groove for forming the threaded side wall of the bottle cap is provided on the outer side of its lower end. The threaded core includes a cylindrical wall body. A core cooling channel that is serpentinely coiled is formed along the circumferential direction at the lower end of the cylindrical wall body for cooling and shaping the threaded side wall of the bottle cap. Therefore, a threaded core is independently designed to cool and shape the threaded side wall of the bottle cap. The serpentinely coiled core cooling channel adopts a unidirectional flow design to ensure uniform water flow of the cooling water and improve the cooling effect. Cooperating with the first water circulation component further shortens the cooling and shaping time of the bottle cap and improves production efficiency. Further, independently designing the threaded core can reserve enough space to design the upper mold water isolation sleeve, ensuring that the structural design of the upper mold water isolation sleeve is more reasonable, that is, the thickness of the mechanism wall is uniform, reducing stress concentration points, enhancing the mechanical strength of the entire upper mold water isolation sleeve, greatly improving its service life, and also improving the service life of the entire mold, thereby reducing maintenance costs and improving production efficiency.

[0018] Furthermore, the lower die includes a third water circulation component, which cooperates with the first and second water circulation components of the upper die to jointly cool the die cavity, greatly shortening the cooling and shaping time of the bottle cap and thus improving the production efficiency. At the same time, the lower die water jacket in the third water circulation component is provided with a cooling channel structure in a single swirling direction, avoiding problems such as uneven flow velocity and flow rate and poor cooling effect in traditional split cooling, thereby improving the cooling effect and product quality.

[0019] The cap pressing machine provided by the present invention adopts the cap making die, which minimizes the failure rate caused by the cap making die during the machine production process. Also, due to the shortening of the cooling and shaping time of the bottle cap and the improvement of the cooling effect by the cap making die, the production efficiency and quality of the bottle caps produced by the entire cap pressing machine are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a partial structural schematic diagram of a cooling module in the prior art provided by the present invention;

[0021] Figure 2 is a three-dimensional structural schematic diagram of a cap making die provided by an embodiment of the present invention;

[0022] Figure 3 is Figure 2 the front view of the cap making die in the view;

[0023] Figure 4 is Figure 3 a partial enlarged structural schematic diagram of part A in;

[0024] Figure 5 is Figure 3 a partial structural schematic diagram in;

[0025] Figure 6 is a schematic diagram of the perspective state of the thread core provided by the present embodiment.

[0026] In the figure: 1 - gas source connector, 2a - liquid inlet connector, 2b - liquid return connector, 3 - connector, 4 - first spring, 10 - upper die, 20 - lower die, 30 - bottle cap, 20a - liquid inlet pipe, 20b - liquid return pipe, 100 - fixed mounting part, 101 - outer sleeve, 102 - inner sleeve, 103 - first liquid inlet flow channel, 104 - second liquid inlet flow channel, 104a - second liquid inlet, 105 - spiral water transport core, 105a - spiral convex part, 105b - convex ring part, 106 - threaded core, 106a - thread groove, 107 - upper die water isolation sleeve, 108 - third spring, 109 - second liquid return flow channel, 109a - second liquid return port, 110 - second spring, 111 - cylindrical pipe sleeve, 111a - outer part, 111b - fixing ring, 112 - air flow channel, 113 - first liquid return flow channel, 114 - core cooling flow channel, 115 - cooling cavity, 200 - die base, 201 - lower die water isolation sleeve, 202 - lower die cooling flow channel, 203 - third liquid inlet flow channel, 204 - third liquid inlet, 205 - third liquid return flow channel, 206 - lower die pressing sleeve, 301 - first liquid inlet, 302 - first liquid return port, 303 - through hole. Specific embodiments

[0027] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Embodiment 1

[0029] Refer to the attached Figure 2 and Figure 5 In this embodiment, a cap - making mold is provided for the preparation of the bottle cap 30. The bottle cap 30 includes an inner side and an outer side opposite to the inner side. The inner side includes a bottom and a threaded side wall formed around the bottom in its circumferential direction. The cap - making mold includes: an upper die 10 and a lower die 20. An upper die surface of the upper die 10 and a lower die surface of the lower die 20 cooperate to form a mold cavity (not shown in the figure) for molding the bottle cap 30.

[0030] Refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6, the upper die 10 includes an upper die body, a cooling module, and an ejection module. Among them, the upper die body of the upper die 10 includes a cylindrical sleeve 111 and a fixed mounting member 100. The fixed mounting member 100 is installed at the upper end of the cylindrical sleeve and extends into the cylindrical sleeve; the cooling module is used to cool and shape the bottle cap 30 in the mold cavity (not shown in the figure), and it includes a first water circulation component and a second water circulation component; the first water circulation component is arranged at the axis of the cylindrical sleeve 111, and it includes a guiding water core, a spiral water circulation core 105, an upper die water isolation sleeve 107, and a connector 3. The guiding water core includes an inner sleeve 102 and an outer sleeve 101. The outer sleeve 101 is coaxially sleeved outside the inner sleeve 102. One lower end of the inner sleeve 102 is hermetically connected to one upper end of the spiral water circulation core 105. A first liquid inlet channel 103 is formed by the upper end face of the inner sleeve 102 penetrating through to the lower end face of the spiral water circulation core 105. The upper die water isolation sleeve 107 is sleeved outside the spiral water circulation core 105 and is hermetically installed with the outer sleeve 101. A cooling cavity 115 is formed between the inner wall of the upper die water isolation sleeve 107 and the lower end face of the spiral water circulation core 105. A first liquid return channel 113 is jointly formed between the inner wall of the upper die water isolation sleeve 107 and the outer wall of the spiral water circulation core 105 and between the inner wall of the outer sleeve 101 and the outer wall of the inner sleeve 102. The upper ends of the inner sleeve 102 and the outer sleeve 101 both extend into the connector 3 and are hermetically connected to the connector 3; the connector 3 includes a first liquid inlet 301 and a first liquid return port 302. The first liquid inlet 301 is communicated with the first liquid inlet channel 103, and the first liquid return port 302 is communicated with the first liquid return channel 113; the second water circulation component includes a liquid inlet pipe 20a, a liquid return pipe 20b, and a threaded core 106. The threaded core 106 is sleeved outside the upper die water isolation sleeve 107. The threaded core 106 includes a cylindrical wall body. The cylindrical wall body has a certain wall thickness and includes an inner side and an outer side. The area between the inner side and the outer side is inside the cylindrical wall body. A thread groove 106a is recessed on the outer side of the lower end of the cylindrical wall body for forming the threaded side wall of the bottle cap 30. A second liquid inlet 104a and a second liquid return port 109a are opened on the upper end face of the cylindrical wall body. The second liquid inlet 104a and the second liquid return port 109a respectively extend downward along the cylindrical wall body to form a second liquid inlet channel 104 and a second liquid return channel 109. A core cooling channel 114 that is serpentinely coiled along the circumference of the cylindrical side wall is formed at the lower end inside the cylindrical wall body. For the specific structure, reference can be made to Figure 6As shown, the core cooling channels 114 communicate with the second liquid inlet channel 104 and the second liquid return channel 109 respectively; one ends of the liquid inlet pipe 20a and the liquid return pipe 20b are respectively externally connected with a liquid inlet joint 2a and a liquid return joint 2b, and the other ends penetrate through the joint 3 and extend downward into the cylindrical pipe sleeve 111, and are respectively communicated with the second liquid inlet 104a and the second liquid return port 109a. The joint 3 is provided with a through hole 303 which has a clearance fit with the liquid inlet pipe 20a and the liquid return pipe 20b respectively; An ejection module includes a gas flow assisted ejection structure. The gas flow assisted ejection structure includes a gas inlet nozzle (not shown in the figure), an outer sleeve 111a, a fixing ring 111b and a gas flow channel 112. The outer sleeve 111a is sleeved outside the threaded core 106, the fixing ring 111b is sleeved outside the outer sleeve 111a, the gas inlet nozzle (not shown in the figure) is opened on the fixed mounting member 100, a gas source joint 1 is installed on the gas inlet nozzle (not shown in the figure), the gas inlet nozzle (not shown in the figure) communicates with the gas flow channel 112, and the gas flow channel 112 extends to the mold cavity (not shown in the figure) along a first gap between the threaded core 106 and the outer sleeve 111a and a second gap formed between the outer sleeve 111a and the fixing ring 111b respectively, for assisting in blowing out the bottle cap 30 and realizing the ejection of the bottle cap 30 into the liquid inlet pipe 20a.

[0031] Furthermore, the spiral water-carrying core 105 further includes a convex ring portion 105b and a spiral convex portion 105a. The convex ring portion 105b is located outside the lower end of the spiral water-carrying core 105. A predetermined number of diversion grooves (not shown in the figure) are recessed on the circumferential side surface of the convex ring portion 105b. The spiral convex portion 105a is formed on the outside of the spiral water-carrying core 105 and is located above the convex ring portion 105b. The spiral convex portion 105a is tangent to the inner wall of the upper die water insulation sleeve 107. The convex ring portion 105b and the spiral convex portion 105a and the spiral water-carrying core 105 are an integral structure.

[0032] Furthermore, a pair of first springs 4 are provided between the joint 3 and the fixed mounting member 100, and the pair of first springs 4 are used to support and buffer the joint 3. A second spring 110 is provided between the fixed mounting member 100 and the cylindrical pipe sleeve 111, which is used to provide the molding pressure of the mold and is used for the reset of the upper die 10 after mold opening to avoid the collision between the threaded core 106 and the lower die 20. A third spring 108 is sleeved outside the upper end of the threaded core 106 to realize the reset of the threaded core 106.

[0033] Refer to Figure 5, the lower die 20 includes a die base 200, a third water circulation component, and a lower die pressing sleeve 206 disposed outside the die base 200. The third water circulation component is disposed within the die base 200 and includes a lower die water isolation sleeve 201. The lower die water isolation sleeve 201 is provided with a third liquid inlet 204 near the middle of the bottom surface of the die base 200. The third liquid inlet 204 extends into the lower die water isolation sleeve 201 to form a lower die cooling channel 202. The lower die cooling channel 202 is in a vortex shape at the bottom of the lower die water isolation sleeve 201 and is serpentinely coiled within the side wall of the lower die water isolation sleeve 201. The vortex-shaped lower die cooling channel 202 designed at the bottom of the lower die water isolation sleeve 201 is used to cool and form the bottom of the outer side of the bottle cap 30, and the serpentinely coiled lower die cooling channel 202 designed within the side wall of the lower die water isolation sleeve 201 is used to cool and form the side wall of the bottle cap 30. The lower die water isolation sleeve 201 is provided with a third liquid return port (not shown in the figure) at the end of the lower die cooling channel 202. The lower die water isolation sleeve 201 is installed within the die base 200 and cooperates with the die base 200 to form the lower die surface (not shown in the figure) for adapting to the outer side of the bottle cap 30. The die base 200 is respectively provided with a third liquid inlet channel 203 and a third liquid return channel 205. The third liquid inlet channel 203 is communicated with the third liquid inlet 204, and the third liquid return channel 205 is communicated with the third liquid return port (not shown in the figure). The lower die cooling channel 202 is designed as a single-direction cooling channel structure in a vortex shape and a serpentine coil shape, avoiding problems such as uneven flow rate and flow volume and poor cooling effect existing in the traditional split-type cooling, thereby improving the cooling effect and the product quality.

[0034] Combined with the attached drawings, the principle of transporting cooling water and ejecting the bottle cap 30 in this embodiment:

[0035] The first water circulation component works: low-temperature cooling water → first liquid inlet 301 → first liquid inlet channel 103 → cooling cavity 115 → first liquid return channel 113 → first liquid return port 302 → heated cooling water; wherein the low-temperature cooling water cools and shapes the inner side of the bottle cap 30 at the cooling cavity 115, and the heated cooling water and the low-temperature cooling water exchange heat at the inner sleeve 102 and the outer sleeve 101.

[0036] The second water circulation component works: low-temperature cooling water → inlet pipe 20a → second liquid inlet 104a → second liquid inlet channel 104 → core cooling channel 114 → second liquid return channel 109 → second liquid return port 109a → return pipe 20b → heated cooling water; wherein the low-temperature cooling water cools and shapes the threaded side wall of the bottle cap 30 at the core cooling channel 114.

[0037] The third water delivery component works. Low-temperature cooling water → the third liquid inlet channel 203 → the third liquid inlet 204 → the lower die cooling channel 202 → the third liquid return port → the third liquid return channel 205 → heated cooling water. Among them, the low-temperature cooling water cools and shapes the outer side of the bottle cap 30 at the lower die cooling channel 202, and at the same time, the heated cooling water cools and shapes the outer side of the bottle cap 30 at the third liquid return channel 205.

[0038] Eject the bottle cap 30. The external air source accesses from the air source connection joint 1. The air flow enters the air flow channel 112 along the air inlet nozzle (not shown in the figure), and enters the cavity along the air flow channel 112 to realize the ejection of the bottle cap 30.

[0039] Embodiment 2

[0040] This embodiment provides a die pressing capping machine, which includes a frame (not shown in the figure), a feeding module (not shown in the figure), an extrusion module (not shown in the figure) and a pressing module (not shown in the figure) arranged on the frame (not shown in the figure). The pressing module includes a rotating main body and a predetermined number of compression molding dies arranged on the rotating main body. The compression molding die is the capping die provided in Embodiment 1. The feeding module extrudes the prepared raw materials to the extrusion module, and after the extrusion module extrudes to the pressing module, the capping die is used for capping.

[0041] The above description is only a specific implementation of the present invention. However, those skilled in the art should understand that this is only an example here. The protection scope of the present invention is defined by the appended claims. Therefore, equivalent changes made to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A cap - making mold for preparing a bottle cap. The bottle cap includes an inner side and an outer side opposite to the inner side. The inner side includes a bottom and a threaded side wall formed around the bottom in its circumferential direction. The cap - making mold comprises: an upper mold and a lower mold. An upper mold surface of the upper mold and a lower mold surface of the lower mold cooperate to form a mold cavity for molding the bottle cap. It is characterized in that the upper mold further includes: an upper - mold body, including a cylindrical pipe sleeve and a fixed mounting member, and the fixed mounting member is installed at the upper end of the cylindrical pipe sleeve; a cooling module for cooling and shaping the bottle cap in the mold cavity. It includes a first water - conveying assembly and a second water - conveying assembly. The first water - conveying assembly is arranged at the axis of the cylindrical pipe sleeve and includes a guiding water core, a spiral water - conveying core, an upper - mold water - isolating sleeve and a joint. The guiding water core includes an inner sleeve and an outer sleeve. The outer sleeve is coaxially sleeved outside the inner sleeve. A lower end of the inner sleeve is hermetically connected to an upper end of the spiral water - conveying core. A first liquid - inlet flow channel is formed by the upper - end face of the inner sleeve penetrating through to the lower - end face of the spiral water - conveying core. The upper - mold water - isolating sleeve is sleeved outside the spiral water - conveying core and is hermetically installed with the outer sleeve. A cooling cavity is formed between the inner wall of the upper - mold water - isolating sleeve and the lower - end face of the spiral water - conveying core. A first liquid - return flow channel is jointly formed between the inner wall of the upper - mold water - isolating sleeve and the outer wall of the spiral water - conveying core and between the inner wall of the outer sleeve and the outer wall of the inner sleeve. The joint includes a first liquid - inlet and a first liquid - return port. The first liquid - inlet is communicated with the first liquid - inlet flow channel, and the first liquid - return port is communicated with the first liquid - return flow channel. The second water - conveying assembly includes a liquid - inlet pipe, a liquid - return pipe and a threaded core. The threaded core is sleeved outside the upper - mold water - isolating sleeve. The threaded core includes a cylindrical wall body. A thread groove is recessed on the outer side of the lower end of the cylindrical wall body for molding the threaded side wall of the bottle cap. A second liquid - inlet and a second liquid - return port are opened on the upper - end face of the cylindrical wall body. The second liquid - inlet and the second liquid - return port respectively extend downward along the inside of the cylindrical wall body to form a second liquid - inlet flow channel and a second liquid - return flow channel. A core - cooling flow channel that spirally winds circumferentially along the cylindrical wall body is formed at the lower end inside the cylindrical wall body. The core - cooling flow channel is respectively communicated with the second liquid - inlet flow channel and the second liquid - return flow channel. The liquid - inlet pipe and the liquid - return pipe penetrate through the joint and extend downward into the cylindrical pipe sleeve and are respectively communicated with the second liquid - inlet and the second liquid - return port; and an ejection module, including an air - flow - assisted ejection structure. The air - flow - assisted ejection structure includes an air - inlet nozzle and an air - flow channel. The air - flow channel extends to the mold cavity for assisting in blowing out the bottle cap; The lower die includes a die base and a third water circulation component. The third water circulation component is arranged in the die base and includes a lower die water isolation sleeve. A third liquid inlet is opened in the middle of the bottom surface of the lower die water isolation sleeve close to the die base. The third liquid inlet extends into the lower die water isolation sleeve to form a lower die cooling flow channel. A third liquid return port is opened at the end of the lower die cooling flow channel in the lower die water isolation sleeve. The lower die water isolation sleeve is installed in the die base and cooperates with the die base to form the lower die surface for adapting to the outer side of the bottle cap. A third liquid inlet flow channel and a third liquid return flow channel penetrate through the die base respectively. The third liquid inlet flow channel is communicated with the third liquid inlet, and the third liquid return flow channel is communicated with the third liquid return port. The cap making mold described above is characterized in that the spiral water circulation core further includes a convex ring part and a spiral convex part. The convex ring part is located on the outer side of the lower end of the spiral water circulation core. A predetermined number of diversion grooves are evenly arranged and recessed on the circumferential side surface of the convex ring part. The spiral convex part is formed on the outer side of the spiral water circulation core and is located above the convex ring part. The spiral convex part is tangent to the inner wall of the upper die water isolation sleeve.

2. The cap making mold according to claim 1, characterized in that, The lower die cooling flow channel is in a vortex shape at the bottom of the lower die water isolation sleeve and is in a serpentine winding shape on the side wall of the lower die water isolation sleeve.

3. The cap making mold according to claim 1, characterized in that, The upper ends of the inner sleeve and the outer sleeve both extend into the joint and are hermetically connected to the joint.

4. The cap making mold according to claim 3, characterized in that, A through hole which is respectively in clearance fit with the liquid inlet pipe and the liquid return pipe penetrates through the joint.

5. The cap making mold according to claim 1, characterized in that, A pair of first springs are arranged between the joint and the fixed mounting part.

6. The cap making mold according to claim 1, characterized in that, A second spring is arranged between the fixed mounting part and the cylindrical pipe sleeve.

7. The cap making mold according to claim 1, characterized in that, A third spring is sleeved on the outer side of the upper end part of the thread core.

8. A die pressing cap making machine includes a frame, a feeding module, an extrusion module and a pressing module arranged on the frame. The pressing module includes a rotating main body and a predetermined number of compression molding molds arranged on the rotating main body. characterized in that, The compression molding mold is the cap making mold according to any one of claims 1-7.

Images