Injection mold for a paint bucket

Abstract

The present invention provides an injection mold for a paint bucket, and belongs to the technical field of injection molds. The injection mold for the paint bucket includes an upper top plate, a movable mold, a fixed mold, and a lower bottom plate. The upper top plate is fixed to the movable mold. A barrel bottom forming block for blocking the upper port of the mold cavity is fixed on the lower end surface of the upper top plate. A gate sleeve is inserted through the barrel bottom forming block. An injection needle is fixed on the upper top plate. The gate sleeve is sleeved on the lower end of the injection needle. The outlet of the injection needle is connected to the mold cavity. A gate cooling channel is provided in the gate sleeve. A barrel outer bottom cooling component capable of cooling the outer bottom surface of the paint bucket is fixed on the barrel bottom forming block. A barrel outer wall cooling component capable of cooling the outer wall of the paint bucket is embedded in the movable mold. A barrel inner cooling component capable of cooling the inner wall and inner bottom surface of the paint bucket is embedded in the core. Multiple cooling components perform all-round cooling on various parts of the paint bucket, and the cooling effect is good and the speed is fast, so as to achieve the purpose of rapid molding and improve product quality and production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds and relates to an injection mold for a paint bucket. Background Art

[0002] The more common paint buckets on the market include a barrel-shaped body, and the outer wall of the upper port of the barrel-shaped body has 2-4 layers of annular reinforcing ribs arranged along the height direction of the paint bucket. The annular reinforcing ribs are used to enhance the strength of the upper port of the paint bucket. There are also handle mounting parts on both sides of the upper port. The two ends of the handle are inserted into the handle mounting part to install the handle. Workers can lift the paint bucket upward by holding the handle. Since the handle mounting part needs to bear the weight of the entire paint bucket, the annular reinforcing ribs are provided to prevent the upper port from being deformed due to the heavy paint bucket. The barrel-shaped body of the paint bucket is integrally injection molded by an injection mold. The cooling system in the injection mold is used to control the temperature of the mold, which can quickly shape the injection molded product, which can not only improve production efficiency, but also affect the shrinkage rate, strength and surface quality of the product.

[0003] For example, the utility model patent with patent number 202021655597.0 discloses a large paint bucket rapid prototyping mold, in which a first pipe is embedded in the inner wall of the molding groove, a second pipe is embedded in the inner cavity of the mold, and a connecting pipe is used to connect the first pipe and the second pipe. When in use, a water cycle is formed between the first pipe, the second pipe and the cooling box. This cooling system that uses a water channel to cool the inside and outside of the barrel is relatively backward, resulting in uneven cooling temperatures in various parts of the barrel at the same time, and as the water temperature rises, the cooling speed at the end of the water channel becomes slower and slower, resulting in uneven cooling and low cooling efficiency. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose an injection mold for a paint bucket, which can perform all-round cooling on all parts of the paint bucket, has good cooling effect and fast cooling speed, achieves the purpose of rapid molding, and improves product quality and production efficiency.

[0005] The objective of the present invention can be achieved through the following technical scheme: an injection mold for a paint bucket, comprising an upper top plate, a movable mold, a fixed mold and a lower bottom plate, the upper top plate is fixed to the movable mold, the fixed mold is fixed to the lower bottom plate, a mold cavity is opened on the movable mold and passes through the movable mold from top to bottom, and a core protruding upward in the middle of the fixed mold and inserted into the mold cavity, characterized in that a barrel bottom forming block for blocking an upper port of the mold cavity is fixed on the lower end surface of the upper top plate, a gate sleeve is penetrated and embedded in the barrel bottom forming block, an injection molding needle is fixed on the upper top plate, the gate sleeve is sleeved on the lower end of the injection molding needle, the outlet of the injection molding needle is connected to the mold cavity, a gate cooling channel is provided in the gate sleeve, a barrel outer bottom cooling component capable of cooling the outer bottom surface of the paint bucket is fixed on the barrel bottom forming block, a barrel outer wall cooling component capable of cooling the outer wall of the paint bucket is embedded in the movable mold, and a barrel inner cooling component capable of cooling the inner wall and inner bottom surface of the paint bucket is embedded in the core.

[0006] Furthermore, the gate sleeve is made of 3D printing, and the gate cooling channel is located on the side of the gate sleeve close to the injection needle. The gate cooling channel includes a circular annular channel and an oblique water inlet pipe and an oblique water outlet pipe connecting the two ends of the annular channel. A gate water inlet pipe and a gate water outlet pipe are provided between the upper top plate and the barrel bottom forming block. The gate water inlet pipe is connected to the oblique water inlet pipe, and the gate water outlet pipe is connected to the oblique water outlet pipe.

[0007] The lower end of the sprue sleeve is close to the center of the outer bottom of the paint bucket. The center of the outer bottom of the paint bucket is cooled quickly by quickly cooling the sprue sleeve. At the same time, the sprue sleeve is made of 3D printing technology, and the sprue cooling channel is designed to be closer to the inner wall of the sprue sleeve, that is, close to the injection port of the injection needle tube, so that the injection port part is quickly cooled to accelerate product shaping.

[0008] Furthermore, the barrel outer bottom cooling assembly includes a central annular pipeline, an inner ring pipeline and an outer ring pipeline. The central annular pipeline is located inside the inner ring pipeline and is connected to the inner ring pipeline. An inner ring water inlet pipeline and an inner ring water outlet pipeline connected to the inner ring pipeline are provided on the upper top plate. An outer ring water inlet pipeline and an outer ring water outlet pipeline connected to the outer ring pipeline are provided on the upper top plate.

[0009] Furthermore, the barrel outer wall cooling assembly includes 4-8 barrel outer wall piping units distributed in a ring around the mold cavity, and the barrel outer wall piping unit is embedded in the movable mold. The barrel outer wall piping unit includes an outer wall cooling straight pipe, a plurality of upper arc-shaped heat-conductive sleeves and lower arc-shaped heat-conductive sleeves. The upper arc-shaped heat-conductive sleeves and the lower arc-shaped heat-conductive sleeves are staggered up and down, and the adjacent upper arc-shaped heat-conductive sleeves and the lower arc-shaped heat-conductive sleeves are connected through the outer wall cooling straight pipes. The outer wall cooling straight pipes on both sides are respectively connected to the barrel outer wall water inlet pipe and the barrel outer wall water outlet pipe.

[0010] Furthermore, the barrel cooling assembly includes an inner cooling pipeline, a middle cooling pipeline and an outer cooling pipeline. The upper end of the core is fixed with a heat conduction plate in contact with the inner bottom surface of the paint bucket by long bolts. The inner cooling pipeline includes an "e"-shaped central cooling part fixed on the heat conduction plate. The upper end of the central cooling part has a plurality of upwardly protruding cylindrical cooling heads, and the two ends of the central cooling part are respectively connected to a bent water inlet pipeline and a bent water outlet pipeline; the middle cooling pipeline includes a middle vertical pipe, an upper concave connecting sleeve, and a lower arc-shaped connecting sleeve. The inner ends of the two upper concave connecting sleeves are respectively connected to On a lower arc-shaped connecting sleeve, the outer ends of two upper concave connecting sleeves are respectively connected to the middle-layer water inlet pipe and the middle-layer water outlet pipe through the middle-layer vertical pipe, and the middle-layer cooling pipeline has two groups, and the four upper concave connecting sleeves form a circle; the outer cooling pipeline includes an outer arc-shaped cooling sleeve, an outer vertical pipe, and a lower straight connecting sleeve, and the inner ends of the two outer arc-shaped cooling sleeves are respectively connected to a lower straight connecting sleeve through the outer vertical pipes, and the outer ends of the two outer arc-shaped cooling sleeves are respectively connected to the outer water inlet pipe and the outer water outlet pipe through the outer vertical pipes, and the outer cooling pipeline has four groups, and eight outer arc-shaped cooling sleeves form a circle.

[0011] Furthermore, an octagonal mold bottom cooling water channel is embedded inside the lower end of the fixed mold, and the mold bottom cooling water channel includes eight mold bottom cooling pipes connected end to end and distributed circumferentially, the water inlet of the mold bottom cooling pipe at the head end is connected to the mold bottom water inlet pipe, and the water outlet of the mold bottom cooling pipe at the end is connected to the mold bottom water outlet pipe.

[0012] Furthermore, the injection mold of the paint bucket also includes a slider ejection assembly, which includes an I-shaped top plate slidably arranged in the lower bottom plate, an inclined guide column fixed on the fixed mold and inclined outward, a molding slider and a limit block. The inner side of the molding slider is provided with an arc groove for molding reinforcing ribs and a molding groove for molding a handle mounting portion. The molding slider is sleeved on the inclined guide column and slides obliquely. Four molding sliders are combined to form a circular ring. A molding groove is provided on the fixed mold. The molding slider is located in the molding groove. The two ends of the molding slider are respectively slidably matched with two limit blocks. The limit blocks are triangular in shape. Translation grooves are provided on both sides of the limit blocks. The ends of the molding slider are embedded in the translation grooves and slide horizontally. A connecting rod connected to the limit block is fixed on the I-shaped top plate. Driving the I-shaped top plate can drive the connecting rod and the limit block to move up and down, thereby driving the molding slider to slide along the inclined direction.

[0013] Furthermore, the molding slider is equipped with a slider cooling pipeline, and the slider cooling pipeline includes a plurality of arc-shaped hollow heat-conducting blocks fixed in the molding slider, and adjacent hollow heat-conducting blocks are connected by bending pipes. The hollow heat-conducting block at the head end is connected to a sliding water inlet pipe, and the hollow heat-conducting block at the end is connected to a sliding water outlet pipe. A movable window is provided on the side of the fixed mold for the sliding water inlet pipe and the sliding water outlet pipe to slide obliquely.

[0014] Furthermore, the molded slider is formed by splicing a plurality of splicing inserts, and the arc groove is formed by combining two upper and lower splicing inserts. When forming the reinforcing rib, the air in the arc groove can be discharged from the splicing gap between the splicing inserts, which can solve the problem of air entrapment in the arc groove during high-speed injection molding; and the spliced ​​molded slider is convenient for installing the slider cooling pipeline inside itself.

[0015] The slider cooling pipeline is set in the forming slider, which can quickly cool the handle installation part and the reinforcing ribs. Through the cooperation of the oblique guide column and the limit block, the vertical top of the I-shaped top plate is converted into an oblique sliding, so that the four forming sliders move obliquely outward, first driving the paint bucket to rise together for a distance, until the reinforcing ribs and the forming slider are completely separated, and the paint bucket can be freely raised vertically, which is convenient for the subsequent paint bucket to be separated from the fixed mold. Since the sliding water inlet pipe and the sliding water outlet pipe move together with the forming slider, the movable window facilitates the sliding water inlet pipe and the sliding water outlet pipe to extend and connect to the external water source, while providing a certain amount of activity space.

[0016] Furthermore, a blowing mechanism for blowing the mold away from the fixed mold is also provided in the fixed mold, and the blowing mechanism includes a side wall blowing pipeline, a bottom blowing pipeline and a top wall blowing pipeline which are opened in the fixed mold and have an air inlet located on the side wall or bottom of the fixed mold. An air outlet insert is inlaid at the bottom of the molding groove, and an oblique air hole is opened on the air outlet insert for blowing air obliquely toward the reinforcement ribs of the paint bucket. The air outlet of the bottom blowing pipeline is connected with the oblique air hole, and a through top wall air outlet is opened on the heat conducting plate, and an air top block is provided in the top wall air outlet, and the top wall blowing pipeline is connected with the top wall air outlet. After air is supplied to the top wall blowing pipeline from the outside, the top wall air outlet can be opened to blow air toward the bottom of the paint bucket; an annular air duct is opened on the upper end surface of the core, and an air outlet gap facing the outside is provided between the annular air duct and the heat conducting plate, and the side wall blowing pipeline is connected with the annular air duct.

[0017] The lower bottom plate is provided with an auxiliary air path connected to the bottom air inlet, so as to facilitate air intake from the side wall of the lower bottom plate. The air cap block, as a common mold accessory, operates by precisely regulating the air valve and utilizing the air diffusion principle to enable the product to fall off quickly and realize efficient and automated operation. The air cap block of this application is a common mold accessory that can be purchased on the market. The three air blowing pipelines are all connected to the air pump through pipes. When the paint bucket is demoulded, the air pump is started to supply air to the side wall air blowing pipeline first. The air enters the gap between the paint bucket and the side wall of the core from the air outlet gap, so that the paint bucket expands, thereby achieving the purpose of loosening the side wall of the paint bucket and the mold; then air is supplied to the top wall air blowing pipeline, so that the air enters the gap between the bottom surface of the paint bucket and the heat conduction plate through the air ejection block, thereby achieving the purpose of loosening the contact surface between the bottom surface of the paint bucket and the heat conduction plate; at the same time, after the paint bucket is ejected for a distance by the slider ejection assembly, air is supplied to the bottom air blowing pipeline, and the air is blown obliquely to the paint bucket from the air outlet insert, so that the paint bucket is blown off the fixed mold.

[0018] All water inlet and outlet pipes are directly connected to the circulating water tank, and can also be connected to the circulating water tank of different water sources according to cooling requirements. After the injection mold is closed, the plastic raw material is injected into the mold cavity through the injection needle. After it is filled, the circulating water tank system is turned on, and cooling water is injected into each cooling pipe, cooling water channel, and cooling component at the same time to take away the heat in the mold and quickly shape the injection molded product. During demoulding, the injection molding machine drives the movable mold to separate from the fixed mold, and the paint bucket is still tightly mounted on the core. At this time, the air pump is started to supply air to the side wall blowing pipeline of the blowing mechanism, first to inflate the inner wall of the paint bucket and loosen it, and then to supply air to the top wall blowing pipeline to inflate the bottom of the paint bucket and loosen it. At the same time, the I-shaped top plate is driven upward by the ejection cylinder, driving the limit block to move upward, thereby driving the molding slide block to move upward along the inclined guide column until the paint bucket moves up a certain distance and the arc groove is separated from the reinforcing rib. Finally, air is supplied through the bottom blowing pipeline, and the air outlet insert sprays air to blow the paint bucket off.

[0019] Compared with the prior art, the injection mold of the paint bucket has the following advantages:

[0020] 1. It has multiple independent cooling pipelines for rapid cooling of the mold. Multiple cooling pipelines are used to closely cool the outer bottom surface, outer wall, inner bottom, inner wall and reinforcing ribs of the barrel, so that the paint barrel can be cooled in all directions and at the same temperature. Since the cooling pipelines are relatively short, the cooling speed is very fast, and the cooling temperature and time are close, so that the cooling progress of each area of ​​the paint barrel is kept consistent, which improves product quality and production efficiency and accelerates product finalization.

[0021] Second, the air blowing mechanism cooperates with the slider ejection assembly to easily eject the shaped paint bucket and fix the mold and blow it off the core. The demoulding method is safe and efficient. Moreover, the paint bucket is expanded and loosened before ejection, which can protect the paint bucket well and avoid violent ejection to damage the reinforcement ribs, causing deformation or cracking of the reinforcement ribs.

[0022] 3. The sprue sleeve has an independent sprue cooling channel, which is made by 3D printing. Since the injection needle still has high-temperature plastic raw materials after injection molding, it affects the cooling of the bottom of the paint bucket. The sprue cooling channel is close to the inner wall of the sprue sleeve, that is, close to the glue inlet of the injection needle, which quickly cools the glue inlet part and accelerates product shaping. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the injection mold of this paint bucket.

[0024] Figure 2 yes Figure 1 Enlarged view at A.

[0025] Figure 3 It is a cross-sectional view of the gate bushing.

[0026] Figure 4 It is a schematic diagram of the structure of the gate cooling channel inside the gate sleeve.

[0027] Figure 5 It is a structural diagram of the moving mold.

[0028] Figure 6 It is a structural schematic diagram of the barrel bottom forming block and the barrel outer wall cooling assembly.

[0029] Figure 7 It is a structural schematic diagram of a barrel outer bottom cooling component and a barrel outer wall cooling component.

[0030] Figure 8 It is a structural schematic diagram of the barrel outer wall piping unit.

[0031] Fig. 9 It is a structural diagram of the fixed mold.

[0032] Fig.10 It is a schematic diagram of the three-dimensional structure of the cooling component in the barrel.

[0033] Fig.11 It is a schematic diagram of the top view of the cooling assembly in the barrel.

[0034] Fig.12 It is a schematic diagram of the structure of the inner cooling pipeline.

[0035] Fig.13 It is a schematic diagram of the structure of the middle layer cooling pipeline.

[0036] Fig.14 It is a schematic diagram of the structure of the mold bottom cooling water channel.

[0037] Fig.15 It is a structural schematic diagram of the slider ejection assembly.

[0038] Fig.16 It is a structural schematic diagram of the slider cooling pipeline.

[0039] Fig.17 It is a schematic diagram of the cross-sectional structure of the forming slider.

[0040] Fig.18 It is a structural schematic diagram of a paint bucket of the present invention.

[0041] In the figure, 1, top plate; 2, movable mold; 21, mold cavity; 3, fixed mold; 31, core; 311, annular air channel; 32, heat conducting plate; 321, top wall air outlet; 322, air top block; 33, molding groove; 34, movable window; 4, bottom plate; 5, barrel bottom molding block; 6, gate sleeve; 61, gate cooling channel; 611, annular channel; 612, oblique water inlet pipeline; 613, oblique water outlet pipeline; 614, gate water inlet pipeline; 615, gate water outlet pipeline; 7, injection needle; 8, barrel outer bottom cooling assembly; 81, center annular pipeline; 82, inner ring shaped pipeline; 821, inner ring water inlet pipeline; 822, inner ring water outlet pipeline; 83, outer ring annular pipeline; 831, outer ring water inlet pipeline; 832, outer ring water outlet pipeline; 9, barrel outer wall cooling assembly; 91, barrel outer wall pipeline unit; 911, outer wall cooling straight pipe; 912, upper arc-shaped heat-conducting sleeve; 913, lower arc-shaped heat-conducting sleeve; 914, barrel outer wall water inlet pipeline; 915, barrel outer wall water outlet pipeline; 10, barrel inner cooling assembly; 101, inner layer cooling pipeline; 1011, central cooling unit; 1012, cooling head; 1013, bent water inlet pipeline; 1014, bent water outlet Pipeline; 102, middle cooling pipeline; 1021, middle vertical pipe; 1022, upper concave connecting sleeve; 1023, lower arc connecting sleeve; 1024, middle water inlet pipe; 1025, middle water outlet pipe; 103, outer cooling pipeline; 1031, outer arc cooling sleeve; 1032, outer vertical pipe; 1033, lower straight connecting sleeve; 1034, outer water inlet pipe; 1035, outer water outlet pipe; 104, mold bottom cooling water channel; 1041, mold bottom cooling pipe; 1042, mold bottom water inlet pipe; 1043, mold bottom water outlet pipe; 11, slider ejection assembly; 111, I-shaped top plate; 112, inclined guide column; 113, forming slider; 1131, splicing insert; 114, limit block; 115, arc groove; 116, forming groove; 117, translation slide; 118, connecting rod; 12, slider cooling pipeline; 121, hollow heat conductive block; 122, bending pipe; 123, sliding water inlet pipe; 124, sliding water outlet pipe; 13, blowing mechanism; 131, side wall blowing pipeline; 132, bottom blowing pipeline; 1321, air outlet insert; 133, top wall blowing pipeline; 14, paint bucket; 141, reinforcing rib; 142, handle installation part. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] like Figure 1 , Figure 5As shown, the injection mold of the paint bucket includes an upper top plate 1, a movable mold 2, a fixed mold 3 and a lower bottom plate 4. The upper top plate 1 is fixed to the movable mold 2, and the fixed mold 3 is fixed to the lower bottom plate 4. The movable mold 2 is provided with a mold cavity 21 which passes through the movable mold 2 from top to bottom, and the middle part of the fixed mold 3 has a core 31 which protrudes upward and is inserted into the mold cavity 21.

[0044] The lower end surface of the upper top plate 1 is fixed with a barrel bottom forming block 5 for blocking the upper port of the mold cavity 21, and a gate sleeve 6 is inserted through the barrel bottom forming block 5. An injection needle tube 7 is fixed on the upper top plate 1. The gate sleeve 6 is sleeved on the lower end of the injection needle tube 7. The outlet of the injection needle tube 7 is connected to the mold cavity 21. The gate sleeve 6 is provided with a gate cooling channel 61. The barrel bottom forming block 5 is fixed with a barrel outer bottom cooling component 8 that can cool the outer bottom surface of the paint bucket 14. The movable mold 2 is embedded with a barrel outer wall cooling component 9 that can cool the outer wall of the paint bucket 14. The core 31 is embedded with a barrel inner cooling component 10 that can cool the inner wall and inner bottom surface of the paint bucket 14. There are multiple independent cooling components in the mold to quickly cool down various parts of the paint bucket 14, so that the paint bucket 14 is cooled in all directions and at the same temperature.

[0045] like Figure 3 , Figure 4 As shown, the gate sleeve 6 is made of 3D printing, and the gate cooling channel 61 is located on the side of the gate sleeve 6 close to the injection needle 7. The gate cooling channel 61 includes a circular annular channel 611 and an oblique water inlet pipeline 612 and an oblique water outlet pipeline 613 connecting the two ends of the annular channel 611. A gate water inlet pipeline 614 and a gate water outlet pipeline 615 are provided between the upper top plate 1 and the barrel bottom forming block 5. The gate water inlet pipeline 614 is connected to the oblique water inlet pipeline 612, and the gate water outlet pipeline 615 is connected to the oblique water outlet pipeline 613.

[0046] The lower end surface of the sprue sleeve 6 is close to the center of the outer bottom surface of the paint bucket 14, and the center of the outer bottom of the paint bucket 14 is quickly cooled by quickly cooling the sprue sleeve 6. At the same time, the sprue sleeve 6 is made of 3D printing technology, and the sprue cooling channel 61 is designed to be closer to the inner wall of the sprue sleeve 6, that is, close to the injection port of the injection needle 7, so that the injection port part is quickly cooled to accelerate product shaping.

[0047] like Figure 6 , Figure 7 As shown, the outer bottom cooling assembly 8 of the barrel includes a central annular pipeline 81, an inner annular pipeline 82 and an outer annular pipeline 83. The central annular pipeline 81 is located inside the inner annular pipeline 82 and communicates with the inner annular pipeline 82. The upper top plate 1 is provided with an inner water inlet pipeline 821 and an inner water outlet pipeline 822 connected to the inner annular pipeline 82. The upper top plate 1 is provided with an outer water inlet pipeline 831 and an outer water outlet pipeline 832 connected to the outer annular pipeline 83. The outer bottom of the barrel is fully covered from inside to outside, the cooling speed is greatly improved, and the cooling is more comprehensive.

[0048] like Figure 8 The barrel outer wall cooling assembly 9 includes 4-8 barrel outer wall pipeline units 91 distributed in an annular manner around the mold cavity 21. The barrel outer wall pipeline unit 91 is embedded in the movable mold 2. The barrel outer wall pipeline unit 91 includes an outer wall cooling straight pipe 911, a plurality of upper arc-shaped heat-conducting sleeves 912 and lower arc-shaped heat-conducting sleeves 913. The upper arc-shaped heat-conducting sleeves 912 and lower arc-shaped heat-conducting sleeves 913 are arranged alternately up and down. The adjacent upper arc-shaped heat-conducting sleeves 912 and lower arc-shaped heat-conducting sleeves 913 are connected through the outer wall cooling straight pipes 911. The outer wall cooling straight pipes 911 on both sides are respectively connected to the barrel outer wall water inlet pipe 914 and the barrel outer wall water outlet pipe 915. Multiple barrel outer wall pipeline units 91 form a ring to cool the barrel outer wall, with high fit and good cooling effect.

[0049] like Fig. 9 , Fig.10 , Fig.11 As shown, the barrel cooling assembly 10 includes an inner cooling pipeline 101, a middle cooling pipeline 102 and an outer cooling pipeline 103, and the upper end of the core 31 is fixed with a heat conducting plate 32 in contact with the inner bottom surface of the paint barrel 14 by long bolts. Fig.12 As shown, the inner cooling pipeline 101 includes an "e"-shaped central cooling part 1011 fixed on the heat conducting plate 32, and the upper end of the central cooling part 1011 has a plurality of cylindrical cooling heads 1012 protruding upward, and the two ends of the central cooling part 1011 are respectively connected to a bent water inlet pipeline 1013 and a bent water outlet pipeline 1014. Fig.13 As shown, the middle-layer cooling pipeline 102 includes a middle-layer vertical pipe 1021, an upper concave connecting sleeve 1022, and a lower arc-shaped connecting sleeve 1023. The inner ends of the two upper concave connecting sleeves 1022 are respectively connected to a lower arc-shaped connecting sleeve 1023 through the middle-layer vertical pipe 1021, and the outer ends of the two upper concave connecting sleeves 1022 are respectively connected to a middle-layer water inlet pipe 1024 and a middle-layer water outlet pipe 1025 through the middle-layer vertical pipe 1021. The middle-layer cooling pipeline 102 has two groups, and four upper concave connecting sleeves 1022 form a circle. The outer cooling pipeline 103 includes an outer arc cooling jacket 1031, an outer vertical pipe 1032, and a lower straight connecting sleeve 1033. The inner ends of the two outer arc cooling jackets 1031 are connected to a lower straight connecting sleeve 1033 through the outer vertical pipe 1032, and the outer ends of the two outer arc cooling jackets 1031 are connected to an outer water inlet pipe 1034 and an outer water outlet pipe 1035 through the outer vertical pipe 1032. The outer cooling pipeline 103 has four groups, and eight outer arc cooling jackets 1031 form a circle. The inner bottom of the barrel is fully covered from the inside to the outside, the cooling speed is greatly improved, and the cooling is more comprehensive.

[0050] like Fig.14As shown, an octagonal mold bottom cooling water channel 104 is embedded inside the lower end of the fixed mold 3, and the mold bottom cooling water channel 104 includes eight mold bottom cooling pipes 1041 connected end to end and distributed circumferentially, the water inlet of the mold bottom cooling pipe 1041 at the head end is connected to the mold bottom water inlet pipe 1042, and the water outlet of the mold bottom cooling pipe 1041 at the end is connected to the mold bottom water outlet pipe 1043. The mold bottom cooling water channel 104 efficiently cools the lower end of the fixed mold 3, has a large contact area, and has a good cooling effect.

[0051] like Fig.15 , Fig.16 As shown, the injection mold of the paint bucket 14 also includes a slider ejection assembly 11, which includes an I-shaped top plate 111 slidably arranged in the lower bottom plate 4, an inclined guide column 112 fixed on the fixed mold 3 and inclined outward, a molding slider 113 and a limit block 114, and an arc groove 115 for molding a reinforcing rib 141 and a molding groove 116 for molding a handle mounting portion 142 are opened on the inner side of the molding slider 113. The molding slider 113 is sleeved on the inclined guide column 112 and slides obliquely. The four molding sliders 113 are surrounded to form a ring, and the fixed mold 3 is provided with an arc groove 115 for molding a reinforcing rib 141 and a molding groove 116 for molding a handle mounting portion 142. The molding slider 113 is sleeved on the inclined guide column 112 and slides obliquely. The four molding sliders 113 are surrounded to form a ring. A forming groove 33 is provided, and a forming slider 113 is located in the forming groove 33. Both ends of the forming slider 113 are respectively slidably matched with two limit blocks 114. The limit blocks 114 are triangular in shape, and translation grooves 117 are provided on both sides of the limit blocks 114. The ends of the forming slider 113 are embedded in the translation grooves 117 and slide horizontally. A connecting rod 118 connected to the limit blocks 114 is fixed on the I-shaped top plate 111. Driving the I-shaped top plate 111 can drive the connecting rod 118 and the limit blocks 114 to move up and down, thereby driving the forming slider 113 to slide along the inclined direction.

[0052] like Fig.16 As shown, the molding slider 113 has a built-in slider cooling pipeline 12, and the slider cooling pipeline 12 includes a plurality of arc-shaped hollow heat-conducting blocks 121 fixed in the molding slider 113, and adjacent hollow heat-conducting blocks 121 are connected by bending pipes 122. The hollow heat-conducting block 121 at the head end is connected to a sliding water inlet pipe 123, and the hollow heat-conducting block 121 at the end is connected to a sliding water outlet pipe 124. A movable window 34 is provided on the side of the fixed mold 3 for the sliding water inlet pipe 123 and the sliding water outlet pipe 124 to slide obliquely.

[0053] like Fig.17 As shown, the molded slider 113 is formed by splicing a plurality of splicing inserts 1131, and the arc groove 115 is formed by combining two upper and lower splicing inserts 1131. When forming the reinforcing rib 141, the air in the arc groove 115 can be discharged from the splicing gap between the splicing inserts 1131, which can solve the problem of trapped air in the arc groove 115 during high-speed injection molding; and the spliced ​​molded slider 113 is convenient for installing the slider cooling pipeline 12 inside itself.

[0054] The slider cooling pipeline 12 is arranged in the forming slider 113, which can quickly cool the handle mounting part 142 and the reinforcing rib 141. Through the cooperation of the oblique guide column 112 and the limit block 114, the vertical top of the I-shaped top plate 111 is converted into an oblique slide, so that the four forming sliders 113 move obliquely outward, first driving the paint bucket 14 to rise together for a distance, until the reinforcing rib 141 is completely separated from the forming slider 113, and the paint bucket 14 can rise vertically freely, which is convenient for the subsequent separation of the paint bucket 14 from the fixed mold 3. Since the sliding water inlet pipe 123 and the sliding water outlet pipe 124 move together with the forming slider 113, the movable window 34 facilitates the sliding water inlet pipe 123 and the sliding water outlet pipe 124 to extend and connect with the external water source, while providing a certain amount of activity space.

[0055] like Figure 1 As shown, the fixed mold 3 is also provided with a blowing mechanism 13 for blowing the mold away from the fixed mold 3, and the blowing mechanism 13 includes a side wall blowing pipeline 131, a bottom blowing pipeline 132 and a top wall blowing pipeline 133, which are opened in the fixed mold 3 and have an air inlet located on the side wall or bottom of the fixed mold 3. An air outlet insert 1321 is embedded at the bottom of the molding groove 33, and an oblique air hole for blowing air inclined toward the reinforcing rib 141 of the paint bucket 14 is opened on the air outlet insert 1321. The air outlet of the bottom blowing pipeline 132 is connected to the oblique air hole The heat conducting plate 32 is provided with a through top wall air outlet 321, and an air top block 322 is arranged in the top wall air outlet 321. The top wall air blowing pipeline 133 is connected with the top wall air outlet 321. After air is supplied to the top wall air blowing pipeline 133 from the outside, the top wall air outlet 321 can be opened to blow air toward the bottom of the paint bucket 14; an annular air channel 311 is provided on the upper end surface of the core 31, and an air outlet gap facing the outside is provided between the annular air channel 311 and the heat conducting plate 32, and the side wall air blowing pipeline 131 is connected with the annular air channel 311.

[0056] The lower bottom plate 4 is provided with an auxiliary air path connected to the bottom air inlet, so as to facilitate air intake from the side wall of the lower bottom plate 4. The three air blowing pipelines are all connected to the air pump through pipes. When the paint bucket 14 is demolded, the air pump is started to first send air to the side wall air blowing pipeline 131, and the air enters the gap between the paint bucket 14 and the side wall of the core 31 from the air outlet slit, so that the paint bucket 14 expands, so as to achieve the purpose of loosening the side wall of the paint bucket 14 and the mold; then, air is sent to the top wall air blowing pipeline 133, so that the air enters the gap between the inner bottom surface of the paint bucket 14 and the heat conducting plate 32 through the air ejection block 322, so as to achieve the purpose of loosening the contact surface between the inner bottom surface of the paint bucket 14 and the heat conducting plate 32; at the same time, after the paint bucket 14 is ejected for a distance by the slider ejection assembly 11, air is sent to the bottom air blowing pipeline 132, and the air is blown obliquely to the paint bucket 14 from the air outlet insert 1321, so that the paint bucket 14 is blown off from the fixed mold 3.

[0057] like Fig.18As shown, the paint bucket 14 of the present application includes a barrel-shaped main body, and the outer wall of the upper port of the barrel-shaped main body has 2-4 layers of reinforcing ribs 141 arranged along the height direction of the paint bucket 14, and the reinforcing ribs 141 are used to enhance the strength of the upper port of the paint bucket 14, and there are also handle mounting parts 142 on both sides of the upper port.

[0058] All water inlet and outlet pipes are directly connected to the external circulating water tank, and can be connected to the circulating water tank of different water sources according to the cooling requirements. After the injection mold is closed, the plastic raw material is injected into the mold cavity 21 through the injection needle 7. After it is filled, the circulating water tank system is turned on, and cooling water is injected into each cooling pipe, cooling water channel, and cooling component at the same time to take away the heat in the mold and quickly shape the injection molded product. During demolding, the injection molding machine drives the movable mold 2 to separate from the fixed mold 3, the paint bucket 14 is still tightly wrapped on the core 31, and the reinforcing rib 141 is stuck in the arc groove 115, and the paint bucket 14 and the fixed mold 3 cannot be separated temporarily. At this time, the air pump is started to supply air to the side wall blowing pipe 131 of the blowing mechanism 13, so as to preferentially inflate the inner side wall of the paint bucket 14 and loosen it, and then supply air to the top wall blowing pipe 133, so as to inflate the bottom of the paint bucket 14 and loosen it, and at the same time, the I-shaped top plate 111 is driven upward by the ejection cylinder, driving the limit block 114 upward, thereby driving the forming slide block 113 to move upward along the inclined guide column 112, until the paint bucket 14 moves up a certain distance, and the arc groove 115 is separated from the reinforcing rib 141, and finally air is supplied through the bottom blowing pipe 132, and the air outlet insert 1321 sprays air to blow the paint bucket 14 off.

[0059] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An injection mold for a paint bucket, comprising an upper top plate (1), a movable mold (2), a fixed mold (3) and a lower bottom plate (4), wherein the upper top plate (1) is fixed to the movable mold (2), the fixed mold (3) is fixed to the lower bottom plate (4), the movable mold (2) is provided with a mold cavity (21) which passes through the movable mold (2) from top to bottom, and the fixed mold (3) has a core (31) protruding upward in the middle thereof and inserted into the mold cavity (21), wherein the mold cavity (21) is provided with a mold cavity (21) which is protruding upward. A barrel bottom forming block (5) for blocking the upper port of the mold cavity (21) is fixed on the lower end surface of the upper top plate (1), a gate sleeve (6) is inserted through the barrel bottom forming block (5), an injection needle tube (7) is fixed on the upper top plate (1), the gate sleeve (6) is sleeved on the lower end of the injection needle tube (7), the outlet of the injection needle tube (7) is connected to the mold cavity (21), a gate cooling channel (61) is provided in the gate sleeve (6), and a barrel cooling channel (61) capable of cooling the outer bottom surface of the paint bucket (14) is fixed on the barrel bottom forming block (5). The outer bottom cooling component (8) is embedded in the movable mold (2) with a barrel outer wall cooling component (9) capable of cooling the outer wall of the paint barrel (14); the core (31) is embedded with a barrel inner cooling component (10) capable of cooling the inner wall and inner bottom surface of the paint barrel (14); the barrel inner cooling component (10) comprises an inner cooling pipeline (101), a middle cooling pipeline (102) and an outer cooling pipeline (103); the upper end of the core (31) is fixed with a guide tube in contact with the inner bottom surface of the paint barrel (14) by a long bolt. The heat plate (32), the inner cooling pipeline (101) comprises an "e"-shaped central cooling portion (1011) fixed on the heat conducting plate (32), the upper end of the central cooling portion (1011) having a plurality of upwardly protruding cylindrical cooling heads (1012), and the two ends of the central cooling portion (1011) are respectively connected to a bent water inlet pipeline (1013) and a bent water outlet pipeline (1014); the middle cooling pipeline (102) comprises a middle vertical pipe (1021), an upper concave connecting sleeve ( 1022), a lower arc-shaped connecting sleeve (1023), the inner ends of the two upper concave connecting sleeves (1022) are respectively connected to a lower arc-shaped connecting sleeve (1023) through a middle-layer vertical pipe (1021), the outer ends of the two upper concave connecting sleeves (1022) are respectively connected to a middle-layer water inlet pipe (1024) and a middle-layer water outlet pipe (1025) through a middle-layer vertical pipe (1021), and the middle-layer cooling pipeline (102) has two groups, and the four upper concave connecting sleeves (1022) form a circle;The outer cooling pipeline (103) comprises an outer arc-shaped cooling jacket (1031), an outer vertical pipe (1032), and a lower straight connecting sleeve (1033); the inner ends of the two outer arc-shaped cooling jackets (1031) are respectively connected to a lower straight connecting sleeve (1033) via the outer vertical pipe (1032); the outer ends of the two outer arc-shaped cooling jackets (1031) are respectively connected to an outer water inlet pipe (1031) via the outer vertical pipe (1032). 34) and an outer water outlet pipe (1035), the outer cooling pipeline (103) having four groups of eight outer arc-shaped cooling sleeves (1031) forming a circle, the fixed mold (3) also having a blowing mechanism (13) for blowing the mold away from the fixed mold (3), the blowing mechanism (13) comprising a side wall blowing pipeline (131) and a bottom blowing pipeline (132) which are opened in the fixed mold (3) and have an air inlet located on the side wall or bottom of the fixed mold (3) and a top wall air blowing pipeline (133), an air outlet insert (1321) is embedded at the bottom of the molding groove (33), an oblique air hole for blowing air obliquely toward the reinforcing rib (141) of the paint bucket (14) is opened on the air outlet insert (1321), an air outlet of the bottom air blowing pipeline (132) is connected to the oblique air hole, a through top wall air outlet (321) is opened on the heat conducting plate (32), and an air cap block (322) is arranged in the top wall air outlet (321). ), the top wall air blowing pipeline (133) is connected to the top wall air outlet (321), and after air is supplied from the outside to the top wall air blowing pipeline (133), the top wall air outlet (321) can be opened to blow air toward the bottom of the paint bucket (14); an annular air channel (311) is opened on the upper end surface of the core (31), and an air outlet gap facing the outside is provided between the annular air channel (311) and the heat conducting plate (32), and the side wall air blowing pipeline (131) is connected to the annular air channel (311). ; 2. The injection mold for a paint bucket according to claim 1, characterized in that: The gate sleeve (6) is made by 3D printing. The gate cooling channel (61) is located on a side of the gate sleeve (6) close to the injection needle tube (7). The gate cooling channel (61) comprises a circular ring-shaped annular channel (611) and an oblique water inlet pipeline (612) and an oblique water outlet pipeline (613) connecting two ends of the annular channel (611). A gate water inlet pipeline (614) and a gate water outlet pipeline (615) are provided between the upper top plate (1) and the barrel bottom molding block (5). The gate water inlet pipeline (614) is connected to the oblique water inlet pipeline (612), and the gate water outlet pipeline (615) is connected to the oblique water outlet pipeline (613).

3. The injection mold for a paint bucket according to claim 1, characterized in that: The barrel outer bottom cooling assembly (8) comprises a central annular pipeline (81), an inner annular pipeline (82) and an outer annular pipeline (83); the central annular pipeline (81) is located inside the inner annular pipeline (82) and is connected to the inner annular pipeline (82); an inner water inlet pipeline (821) and an inner water outlet pipeline (822) connected to the inner annular pipeline (82) are provided on the upper top plate (1); and an outer water inlet pipeline (831) and an outer water outlet pipeline (832) connected to the outer annular pipeline (83) are provided on the upper top plate (1).

4. The injection mold for a paint bucket according to claim 1, characterized in that: The barrel outer wall cooling assembly (9) comprises 4 to 8 barrel outer wall pipeline units (91) distributed in an annular manner around the mold cavity (21); the barrel outer wall pipeline unit (91) is embedded in the movable mold (2); the barrel outer wall pipeline unit (91) comprises an outer wall cooling straight pipe (911), a plurality of upper arc-shaped heat-conducting sleeves (912) and lower arc-shaped heat-conducting sleeves (913); the upper arc-shaped heat-conducting sleeves (912) and the lower arc-shaped heat-conducting sleeves (913) are arranged alternately up and down; adjacent upper arc-shaped heat-conducting sleeves (912) and lower arc-shaped heat-conducting sleeves (913) are connected through the outer wall cooling straight pipes (911); and the outer wall cooling straight pipes (911) on both sides are respectively connected to the barrel outer wall water inlet pipe (914) and the barrel outer wall water outlet pipe (915).

5. The injection mold for a paint bucket according to claim 1, characterized in that: An octagonal mold bottom cooling water channel (104) is also embedded in the interior of the lower end of the fixed mold (3), and the mold bottom cooling water channel (104) comprises eight mold bottom cooling pipes (1041) connected end to end and distributed circumferentially, the water inlet of the mold bottom cooling pipe (1041) at the head end is connected to the mold bottom water inlet pipe (1042), and the water outlet of the mold bottom cooling pipe (1041) at the tail end is connected to the mold bottom water outlet pipe (1043).

6. The injection mold for a paint bucket according to claim 1, characterized in that: The injection mold of the paint bucket further comprises a slider ejection assembly (11), wherein the slider ejection assembly (11) comprises an I-shaped top plate (111) slidably arranged in the lower bottom plate (4), an inclined guide column (112) fixed on the fixed mold (3) and inclined outwardly, a molding slider (113) and a limit block (114), wherein the inner side of the molding slider (113) is provided with an arc groove (115) for molding a reinforcing rib (141) and a molding groove (116) for molding a handle mounting portion (142), the molding slider (113) is sleeved on the inclined guide column (112) and slides obliquely, and the four molding sliders (113) are enclosed to form a circular ring, and the fixed mold (3) is provided with a molding groove (115) for molding a reinforcing rib (141) and a molding groove (116) for molding a handle mounting portion (142). The molding groove (33) is provided with a molding slide block (113) in the molding groove (33). The two ends of the molding slide block (113) are respectively slidably matched with two limit blocks (114). The limit blocks (114) are triangular in shape. Translational slide grooves (117) are provided on both sides of the limit blocks (114). The ends of the molding slide block (113) are embedded in the translational slide grooves (117) to slide horizontally. A connecting rod (118) connected to the limit blocks (114) is fixed on the I-shaped top plate (111). The driving of the I-shaped top plate (111) can drive the connecting rod (118) and the limit blocks (114) to move up and down, thereby driving the molding slide block (113) to slide along the inclined direction.

7. The injection mold for a paint bucket according to claim 6, characterized in that: The molding slider (113) has a slider cooling pipeline (12) built therein, the slider cooling pipeline (12) comprising a plurality of arc-shaped hollow heat-conducting blocks (121) fixed inside the molding slider (113), adjacent hollow heat-conducting blocks (121) being connected via a bent pipe (122), a sliding water inlet pipe (123) being connected to the hollow heat-conducting block (121) at the head end, a sliding water outlet pipe (124) being connected to the hollow heat-conducting block (121) at the tail end, and a movable window (34) for the sliding water inlet pipe (123) and the sliding water outlet pipe (124) to slide obliquely is provided on the side of the fixed mold (3).

8. The injection mold for a paint bucket according to claim 7, characterized in that: The forming slide block (113) is formed by splicing a plurality of splicing inserts (1131), and the arc groove (115) is formed by combining two upper and lower splicing inserts (1131).

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