An injection molding mold with air flotation and automatic gate cutting functions

Abstract

The present invention relates to an injection molding mold with both air flotation and automatic gate cutting functions, an injection molding mold with both air flotation and automatic gate cutting functions, two first baffles are slidably connected along the mold opening direction of the mold on the fixed template, two groups of first driving parts are arranged on the fixed template, two exhaust cavities are arranged on the movable template, two exhaust channels are arranged on the fixed template, the two exhaust channels are connected to the two cavities respectively, and the exhaust channels are connected to the exhaust cavities and the cavities when the molds are closed, two second baffles are slidably connected along the mold opening direction of the mold on the fixed template, two groups of second driving parts are arranged on the fixed template, and the second driving parts are used to drive the second baffles to slide into the exhaust channel so that the second baffles block the cavity and the exhaust channel. The present invention ensures that the product can be automatically trimmed while the product is being formed.

Description

Technical Field

[0001] The invention relates to the field of molds, and in particular to an injection molding mold with air flotation and automatic gate cutting functions. Background Art

[0002] A kind of electric tricycle left and right plastic handrails as attached Fig.13 As shown, two symmetrical armrest bodies 9 are included, and the ends of the two armrest bodies 9 are provided with a mounting portion 91 .

[0003] The armrest body 9 is produced by injection molding using a mold. During the injection molding of the armrest body 9, a gas-assisted process of injecting gas into the mold is used to assist the molding of the armrest body 9. The application of the gas-assisted process can reduce the weight of the armrest body 9, thereby reducing the plastic required for the injection molding of the armrest body 9, thereby reducing the production cost of the armrest body 9.

[0004] When gas is injected into the mold by the gas-assisted process, the gas may flush the hot-melt plastic back into the injection channel of the mold, making it impossible for the hot-melt plastic to fill the molding area in the mold for molding the armrest body 9 according to the predetermined filling route, thereby failing to ensure smooth injection molding of the armrest body 9. Summary of the invention

[0005] The present application provides an injection molding mold that has both air flotation and automatic gate trimming functions, which ensures that the product can be automatically trimmed while the product is being molded.

[0006] The present application provides an injection molding mold with both air flotation and automatic gate cutting functions, which adopts the following technical solutions:

[0007] An injection molding mold with both air flotation and automatic gate cutting functions, comprising an upper mold body and a lower mold body, wherein the upper mold body comprises an upper fixed plate, a fixed mold plate, two cavities opened on the fixed mold plate, and two injection runners, wherein the two injection runners are respectively connected to the two cavities; the lower mold body comprises a lower fixed plate, two top plates, two mold feet, a movable mold plate, an air inlet needle arranged on the top plate and a plurality of ejector needles, and two cores opened on the movable mold plate, wherein two first baffles are slidably connected to the fixed mold plate along the mold opening direction of the mold, and two groups of first driving parts are arranged on the fixed mold plate, wherein The first driving unit is used to drive the first baffle to slide into the injection channel 1 so that the first baffle blocks the cavity and the injection channel 1; two exhaust cavities are provided on the movable template, and two exhaust channels are provided on the fixed template. The two exhaust channels are connected to the two cavities respectively, and the exhaust channels are connected to the exhaust cavity and the cavity when the mold is closed. Two second baffles are slidably connected to the fixed template along the opening direction of the mold. Two groups of second driving units are provided on the fixed template. The second driving unit is used to drive the second baffle to slide into the exhaust channel so that the second baffle blocks the cavity and the exhaust channel.

[0008] By adopting the above technical solution, after the mold is closed, the second driving unit drives the second baffle to slide so that the second baffle slides into the exhaust channel and conflicts with the movable template. At this time, the second baffle will block the cavity and the exhaust channel, so that the hot melt plastic will not flow into the exhaust channel and the exhaust cavity when it is injected into the cavity. Then the injection molding machine injects the hot melt plastic into the cavity and the core through the injection runner 1. After the injection of the hot melt plastic is completed, the second driving unit drives the second baffle to slide and reset so that the exhaust channel connects the cavity and the air inlet cavity. At the same time, after the injection of the hot melt plastic is completed, the first driving unit drives the first baffle to slide into the injection runner 1 and conflict with the movable template. At this time, the first baffle blocks the injection runner 1 and the cavity. When the first baffle slides into the injection runner 1, it will cut off the hot melt plastic in the cavity and the hot melt plastic in the injection runner 1, thereby achieving the effect of trimming the gate. Subsequently, gas is injected into the mold through the air inlet needle, and the gas will drive the hot melt plastic to flow, thereby filling the core and the cavity to ensure the smooth molding of the product. At the same time, the gas will enter the exhaust cavity from the cavity through the exhaust channel, thereby preventing the gas from being trapped in the core and the cavity and affecting the molding of the armrest body. After the gas-assisted molding of the armrest body, the second drive unit drives the second baffle to slide into the exhaust channel to cut off the injection waste in the armrest body and the exhaust channel, thereby achieving the purpose of trimming the gate.

[0009] Preferably, the first driving part includes a first matching block connected to the fixed template along the mold opening direction of the mold, a first driving block slidably connected to the fixed template along the mold opening direction perpendicular to the mold, a first oil cylinder for driving the first driving block to slide, a T-shaped first inclined groove provided on the first driving block, a first sliding block provided on the first matching block and slidably matched with the T-shaped first inclined groove, the first baffle is provided on the first matching block, and when the first driving block slides, the first sliding block is driven to slide through the T-shaped first inclined groove.

[0010] By adopting the above technical solution, when the output shaft of the first oil cylinder is extended, it will drive the first driving block to move away from the first oil cylinder. When the first driving block moves away from the first oil cylinder, it will drive the first slider to slide toward the movable template through the T-shaped first inclined groove. When the first slider slides toward the movable template, it will move the first matching block and the first baffle plate close to the movable template, so that the first baffle plate moves into the injection molding runner 1 and abuts against the movable template, thereby blocking the injection molding runner 1 and the cavity and cutting off the gate of the handrail body. When the output shaft of the first oil cylinder is retracted, it will drive the first driving block to move close to the first oil cylinder. When the first driving block moves close to the first oil cylinder, it will drive the first slider to slide away from the movable template through the T-shaped first inclined groove. When the first slider slides away from the movable template, it will move the first matching block and the first baffle plate away from the movable template, so that the first baffle plate moves out of the injection molding runner 1, so that the injection molding runner 1 is connected with the cavity, and the hot melt plastic can be injected into the cavity and the core through the injection molding runner 1.

[0011] Preferably, the second driving part includes a second matching block connected to the fixed template along the mold opening direction of the mold, a second driving block slidably connected to the fixed template along the mold opening direction perpendicular to the mold, a second oil cylinder for driving the second driving block to slide, a T-shaped second inclined groove provided on the second driving block, a second slider provided on the second matching block and slidably matched with the T-shaped second inclined groove, the second baffle is provided on the second matching block, and when the second driving block slides, the second slider is driven to slide through the T-shaped second inclined groove.

[0012] By adopting the above technical solution, when the output shaft of the second oil cylinder is extended, it will drive the second driving block to move away from the second oil cylinder. When the second driving block moves away from the second oil cylinder, it will drive the second slider to slide toward the movable template through the T-shaped second inclined groove. When the second slider slides toward the movable template, it will move the second matching block and the second baffle plate close to the movable template, and finally the second baffle plate will move into the exhaust channel and abut against the movable template to block the mold cavity and the exhaust channel. When the output shaft of the second oil cylinder is retracted, it will drive the second driving block to move close to the second oil cylinder. When the second driving block moves close to the second oil cylinder, it will drive the second slider to slide away from the movable template through the T-shaped second inclined groove. When the second slider slides away from the movable template, it will move the second matching block and the second baffle plate away from the movable template, so that the second baffle plate moves out of the exhaust channel, so that the exhaust channel is connected with the mold cavity.

[0013] Preferably, two sliding grooves are provided on the movable template, the two sliding grooves are respectively connected to the two cores, and the two sliding grooves are slidingly connected with forming blocks for the forming assembly part; two inclined rods are provided on the fixed template, and inclined holes are provided on the two forming blocks. The two inclined rods are respectively plugged into the two inclined holes, and the inclined rods and the inclined holes cooperate to convert the power of opening and closing the upper mold body and the lower mold body into the power of sliding the forming blocks.

[0014] By adopting the above technical solution, when the injection molding machine controls the lower mold body to move toward the upper mold body, the inclined rod will move and insert into the inclined hole, and the inclined rod will drive the molding block to move close to the core, and finally the inclined rod will press the molding block against the movable mold plate so that the molding block and the core are connected to form the handrail body. After the injection molding of the handrail body is completed, the injection molding machine controls the lower mold body to move away from the upper mold body. When the lower mold body moves away from the upper mold body, the inclined rod will drive the molding block to move away from the assembly part, thereby releasing the undercut structure between the molding block and the assembly part so that the handrail body after injection molding can be demolded smoothly.

[0015] Preferably, a sliding cavity 1 is provided on the forming block, and an avoidance block is slidingly connected in the sliding cavity 1, and a slope is provided on a surface of the avoidance block facing the core; a sliding cavity 2 is provided on the side wall of the sliding cavity 1 away from the core, and one end of the avoidance block extends into the sliding cavity 2, and a spring is provided in the sliding cavity 2, and the elastic force of the spring acts on the avoidance block. When there is no external force, the spring presses the avoidance block against the side wall of the sliding cavity 1 close to the core, and when the mold is closed, the slope and the sliding cavity 1 are located on the movement path of the first baffle.

[0016] By adopting the above technical solution, after the first baffle moves into the injection molding runner 1, it will continue to move and conflict with the inclined surface, and then the first baffle will continue to move and push the avoidance block to move away from the core, and finally the first baffle will move into the sliding cavity 1 and fit the side wall of the sliding cavity 1 close to the core, and the spring will press the avoidance block against the first baffle. At this time, a sealing structure is formed between the side wall of the sliding cavity 1 close to the core, the first baffle, and the avoidance block. If there is no above-mentioned sealing structure, the first baffle will only conflict with the movable template when it extends into the injection molding runner 1. Under the action of gas pressure, the hot melt plastic in the cavity will drill into the injection molding runner 1 from the gap between the first baffle and the movable template, so that the handrail body will also be connected to the waste material in the injection molding runner 1, which will make the first baffle unable to play the purpose of trimming the gate of the handrail body well, and the gate must be manually trimmed after the injection molding of the handrail body is completed. Therefore, the above-mentioned sealing structure is provided to better block the injection molding runner and the mold cavity during the gas-assisted molding stage of the handrail body, prevent the connection between the handrail body and the waste material in the injection molding material, and ensure the effect of trimming the gate of the first baffle.

[0017] Preferably, a stopper is provided on the avoidance block, and the stopper is located on the side of the avoidance block away from the core. The stopper is attached to and slidably connected to the surface of the molding block. The stopper is used to form a blocking structure with the avoidance block to prevent hot-melt plastic from entering the sliding cavity two. When the mold is closed, the stopper extends into the injection runner one.

[0018] By adopting the above technical solution, hot melt plastic is prevented from entering and filling the second sliding cavity, thereby ensuring the pushing and resetting effect of the spring on the avoidance block.

[0019] Preferably, a third baffle is provided on the avoidance block, and the third baffle is used to extend into injection channel 1 when the upper mold body and the lower mold body are closed. After the third baffle extends into injection channel 1, it forms a narrow opening with injection channel 1 for preventing hot melt plastic from being sprayed into the cavity.

[0020] By adopting the above technical solution, a third baffle is provided to improve the injection molding quality of the handrail body. At the same time, when the hot melt plastic is injected into the mold cavity through the injection molding runner 1, it will press against the third baffle and the avoidance block, so that the avoidance block moves toward the core, so that the hot melt plastic will press the avoidance block against the side wall of the sliding cavity 1 close to the core, preventing the hot melt plastic from drilling into the sliding cavity 1. At the same time, the third baffle will form an inverted structure with the waste material retained in the injection molding runner 1. After the mold is opened, the molding block will move away from the handrail body. When the molding block moves away from the handrail body, it will also move away from the handrail body with the avoidance block and the third baffle. When the third baffle moves away from the handrail body, it will pull the waste material in the injection molding runner 1 away from the handrail body, completing the fracture separation of the handrail body and the waste material, thereby achieving the purpose of trimming the gate. The above structure is set because after the mold has been molded for tens of thousands of times, the first baffle will be worn due to frequent movement, which will increase the gap between the first baffle and the injection runner 1. At this time, the plastic in the cavity will easily pass through the gap between the first baffle and the injection runner 1 under the pressure of the gas, and drill into the injection runner 1 and reconnect with the waste material in the injection runner 1. If the above structure is set, even if the handrail body is connected to the waste material during the gas-assisted molding process, the connection between the waste material and the handrail body will be broken when the mold is opened later, thereby achieving the automatic trimming effect of the handrail body gate.

[0021] Preferably, a connecting channel connecting the outside and the sliding cavity 1 is provided on the forming block, and when the mold is closed, the connecting channel and the channel opening of the sliding cavity 1 face the first baffle.

[0022] By adopting the above technical solution, when hot melt plastic is injected, if plastic is squeezed into the space between the sliding cavity 1 and the avoidance block, the plastic entering the sliding cavity 1 will be pushed into the connecting channel during the movement of the first baffle to prevent the plastic retained in the sliding cavity from affecting the reset of the avoidance block. At the same time, the design of the connecting channel can also prevent the plastic in the mold cavity from drilling into the injection flow channel 1.

[0023] The technical effects of the present invention are mainly reflected in the following aspects:

[0024] 1. The present invention ensures that the product can be automatically cut at the gate while ensuring gas-assisted molding of the product;

[0025] 2. The present invention provides a third baffle to separate the product and the injection molding waste;

[0026] 3. The present invention provides a connecting channel to prevent plastic from being retained in the sliding cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the mold of this application.

[0028] Figure 2 It is a structural schematic diagram of the upper mold body.

[0029] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0030] Figure 4 It is a structural schematic diagram of the lower mold body.

[0031] Figure 5 It is a structural diagram of fixed templates, movable templates and other components.

[0032] Figure 6 yes Figure 5 Partial cross-sectional view of the center fixed template and other components along line BB.

[0033] Figure 7 yes Figure 5 Schematic diagram of the structure of the first driving part and the first baffle.

[0034] Figure 8 yes Figure 6 A partial enlarged view of point C in the middle.

[0035] Fig. 9 yes Figure 2 A partial enlarged view of point D in the middle.

[0036] Fig.10 yes Figure 5 Partial cross-sectional view of the center fixed template and other components along line EE.

[0037] Fig.11 yes Figure 5 Schematic diagram of the structure of the second driving part and the second baffle.

[0038] Fig.12 yes Fig.10 A partial enlarged view of point F in the middle.

[0039] Fig.13 It is a structural schematic diagram of the left and right plastic handrails of an electric tricycle.

[0040] Figure numerals: 1, upper mold body; 11, upper fixed plate; 12, fixed mold plate; 121, first baffle; 122, exhaust channel; 123, second baffle; 124, inclined rod; 13, cavity; 14, injection flow channel 1; 2, lower mold body; 21, lower fixed plate; 22, top plate; 23, mold foot; 24, movable mold plate; 241, exhaust cavity; 242, sliding groove; 243, injection flow channel 2; 25, air inlet needle; 26, ejector pin; 27, core; 28, pull rod; 3, first driving part; 31, first mating part Block; 32, first driving block; 33, first oil cylinder; 34, T-shaped first inclined groove; 35, first slider; 4, second driving part; 41, second matching block; 42, second driving block; 43, second oil cylinder; 44, T-shaped second inclined groove; 45, second slider; 5, forming block; 51, inclined hole; 52, sliding cavity one; 53, sliding cavity two; 54, spring; 55, connecting channel; 6, avoidance block; 61, inclined surface; 7, stopper; 81, third stopper; 82, narrow pass; 9, handrail body; 91, assembly part. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0042] Reference Figure 1-Figure 3 The present embodiment of an injection molding mold with both air flotation and automatic gate cutting functions includes an upper mold body 1 and a lower mold body 2. The upper mold body 1 includes an upper fixed plate 11, a fixed mold plate 12, two mold cavities 13 opened on the fixed mold plate 12, and two injection runners 14. The two injection runners 14 are respectively connected to the two mold cavities 13. The two injection runners 14 are connected to each other at one end away from the two mold cavities 13.

[0043] Reference Figure 4 The lower mold body 2 includes a lower fixed plate 21, two top plates 22, two mold feet 23, a movable mold plate 24, and two cores 27 provided on the movable mold plate 24. The movable mold plate 24 is provided with two exhaust cavities 241, and the fixed mold plate 12 is provided with two exhaust channels 122, which are respectively connected to the two mold cavities 13. When the mold is closed, the two exhaust channels 122 are respectively connected to the two exhaust cavities 241 and the two mold cavities 13.

[0044] Reference Figure 4 The movable mold plate 24 is also provided with an injection flow channel 243, which is butted with one end of the two injection flow channels 14 that are interconnected when the mold is closed. Two pull rods 28 are fixed on one of the top plates 22, and both pull rods 28 extend into the injection flow channel 243.

[0045] Reference Figure 4The lower mold body 2 also includes four air inlet needles 25 and a plurality of ejector needles 26 fixed on the ejector plate 22. The four air inlet needles 25 are grouped in pairs, and a group of air inlet needles 25 extends into a core 27. The plurality of ejector needles 26 are divided into four groups, two groups of ejector needles 26 extend into two cores 27, and two groups of ejector needles 26 extend into two exhaust cavities 241, respectively.

[0046] Reference Figure 2 , Figure 3 , Figure 5-Figure 8 Two first baffles 121 are slidably connected to the fixed mold plate 12 along the mold opening direction of the mold. Two groups of first driving parts 3 are provided on the fixed mold plate 12. The first driving part 3 is used to drive the first baffle 121 to slide into the injection channel 14 so that the first baffle 121 blocks the cavity 13 and the injection channel 14.

[0047] Reference Figure 6 and Figure 7 The first driving part 3 includes a first matching block 31 connected to the fixed template 12 along the mold opening direction of the mold, a first driving block 32 slidably connected to the fixed template 12 along the mold opening direction perpendicular to the mold, a first oil cylinder 33 for driving the first driving block 32 to slide, a T-shaped first inclined groove 34 provided on the first driving block 32, and a first sliding block 35 fixed on the first matching block 31 and slidably matched with the T-shaped first inclined groove 34.

[0048] Reference Figure 5-Figure 7 The two first baffles 121 are respectively fixed on the first matching block 31, and when the first driving block 32 slides, the first slider 35 is driven to slide through the T-shaped first inclined groove 34. In order to save costs, in this embodiment, the two first driving blocks 32 are directly made together, and then a first oil cylinder 33 is used to drive the two first driving blocks 32 to slide at the same time.

[0049] Reference Figure 9-12 Two second baffles 123 are slidably connected to the fixed template 12 along the mold opening direction of the mold. Two sets of second driving parts 4 are provided on the fixed template 12. The second driving parts 4 are used to drive the second baffles 123 to slide into the exhaust channel 122 and conflict with the movable template 24 so that the second baffles 123 block the cavity 13 and the exhaust channel 122.

[0050] Reference Figure 5 , Fig.10 and Fig.11, wherein the second driving part 4 comprises a second matching block 41 connected to the fixed plate 12 along the mold opening direction of the mold, a second driving block 42 slidably connected to the fixed plate 12 along the mold opening direction perpendicular to the mold, a second oil cylinder 43 for driving the second driving block 42 to slide, a T-shaped second inclined groove 44 provided on the second driving block 42, and a second slider 45 fixed to the second matching block 41 and slidably matched with the T-shaped second inclined groove 44. The output shaft of the second oil cylinder 43 is connected to the second driving block 42, the second baffle 123 is fixed to the second matching block 41, and when the second driving block 42 slides, the second slider 45 is driven to slide through the T-shaped second inclined groove 44.

[0051] Reference Figure 1 , Figure 2 , Figure 4-Figure 6 The movable plate 24 is provided with two sliding grooves 242, the two sliding grooves 242 are connected to the two cores 27 respectively, and the two sliding grooves 242 are slidably connected with the forming blocks 5 for forming the assembly part 91. The fixed plate 12 is provided with two inclined rods 124, and the two forming blocks 5 are provided with inclined holes 51. The two inclined rods 124 are respectively plugged and matched with the two inclined holes 51. The inclined rods 124 cooperate with the inclined holes 51 to convert the power of opening and closing the upper mold body 1 and the lower mold body 2 into the power of sliding the forming blocks 5.

[0052] Reference Figure 1 , Figure 2 , Figure 4-Figure 6 When the injection molding machine controls the lower mold body 2 to move toward the upper mold body 1, the inclined rod 124 will move and insert into the inclined hole 51, and the inclined rod 124 will drive the molding block 5 to move close to the core 27. Finally, the inclined rod 124 will press the molding block 5 against the movable mold plate 24 so that the molding block 5 is connected with the core 27 to form the handrail body 9. After the injection molding of the handrail body 9 is completed, the injection molding machine controls the lower mold body 2 to move away from the upper mold body 1. When the lower mold body 2 moves away from the upper mold body 1, the inclined rod 124 will drive the molding block 5 to move away from the assembly part 91, thereby releasing the undercut structure between the molding block 5 and the assembly part 91 so that the handrail body 9 after injection molding can be demolded smoothly.

[0053] Reference Figure 4-Figure 6 , Figure 8 The molding block 5 is provided with a sliding cavity 1 52, and a avoidance block 6 is slidably connected in the sliding cavity 1 52 along the mold opening direction perpendicular to the mold, and a slope 61 is provided on the side of the avoidance block 6 facing the core 27. A sliding cavity 2 53 is provided on the side wall of the sliding cavity 1 52 away from the core 27, and one end of the avoidance block 6 extends into the sliding cavity 2 53. A spring 54 is provided in the sliding cavity 2 53, and the elastic force of the spring 54 acts on the avoidance block 6. When there is no external force, the spring 54 presses the avoidance block 6 against the side wall of the sliding cavity 1 52 close to the core 27.

[0054] Reference Figure 4-Figure 6 , Figure 8When the mold is closed, the inclined surface 61 and the sliding cavity 1 52 are located on the movement path of the first baffle 121. The forming block 5 is provided with a connecting channel 55 connecting the outside and the sliding cavity 1 52. When the mold is closed, the channel openings of the connecting channel 55 and the sliding cavity 1 52 face the first baffle 121.

[0055] Reference Figure 4-Figure 6 , Figure 8 A stopper 7 is integrally formed on the avoidance block 6. The stopper 7 is located on the side of the avoidance block 6 away from the core 27. The stopper 7 is attached to and slidably connected to the surface of the molding block 5. The stopper 7 is used to cooperate with the avoidance block 6 to prevent the hot melt plastic from entering the sliding cavity 53. When the mold is closed, the stopper 7 extends into the injection runner 14.

[0056] Reference Figure 4-Figure 6 , Figure 8 A third baffle 81 is integrally formed on the avoidance block 6, and the third baffle 81 is used to extend into the injection channel 14 when the upper mold body 1 and the lower mold body 2 are closed. After the third baffle 81 extends into the injection channel 14, it forms a bottleneck 82 with the injection channel 14 for preventing hot melt plastic from being sprayed into the cavity 13.

[0057] The complete injection molding process of the armrest body 9 of the present application is as follows:

[0058] Reference Figure 1 , Figure 2 and Figure 4 First, the injection molding machine controls the lower mold body 2 to move toward the upper mold body 1 to complete the mold closing so that the core 27 is connected to the cavity 13. When the injection molding machine controls the lower mold body 2 to move toward the upper mold body 1, the two inclined rods 124 will move and insert into the two inclined holes 51, and the two inclined rods 124 will drive the two molding blocks 5 to move close to the core 27. When the upper mold body 1 and the lower mold body 2 are closed, the two inclined rods 124 will also press the two molding blocks 5 against the movable mold plate 24 so that the two molding blocks 5 are respectively connected to the two cores 27 to form the handrail body 9 together.

[0059] Reference Figure 5 , Figure 9-12 After the mold is closed, the output shafts of the two second oil cylinders 43 extend to drive the two second driving blocks 42 to move away from the second oil cylinders 43. When the two second driving blocks 42 move away from the two second oil cylinders 43, they drive the two second sliders 45 to slide toward the movable template 24 through the two T-shaped second inclined grooves 44. When the two second sliders 45 slide toward the movable template 24, they will move the two second matching blocks 41 and the two second baffles 123 close to the movable template 24, and finally make the two second baffles 123 move into the two exhaust channels 122 respectively and abut against the movable template 24, and the two second baffles 123 respectively block the two cavities 13 and the two exhaust channels 122.

[0060] Reference Figure 5-Figure 8 After the two second baffles 123 respectively block the two cavities 13 and the two exhaust channels 122, the injection molding machine injects hot-melt plastic into the mold. The hot-melt plastic will first flow into the injection runner 243, and then flow into the two injection runners 14. Then, the hot-melt plastic is injected into the two cavities 13 through the two injection runners 14. When the hot-melt plastic is injected into the cavity 13 through the injection runner 14, it will press the third baffle 81 and the avoidance block 6, thereby pressing the avoidance block 6 against the side wall of the sliding cavity 52 close to the core 27 to prevent the hot-melt plastic from drilling into the sliding cavity 52 and the avoidance block 6.

[0061] Reference Figure 5-Figure 8 After the hot melt plastic is injected, the output shaft of the first cylinder 33 extends and drives the two first driving blocks 32 to move away from the first cylinder 33. When the two first driving blocks 32 move away from the first cylinder 33, they will drive the two first sliders 35 to slide toward the movable template 24 through the two T-shaped first inclined grooves 34. When the two first sliders 35 slide toward the movable template 24, they will carry the two first matching blocks 31 and the two first blocking pieces 121 to move close to the movable template 24.

[0062] Reference Figure 5-Figure 8 When the two first baffles 121 move close to the movable mold plate 24, they will first move into the two injection runners 14 respectively. When the first baffles 121 slide into the injection runner 14, they will cut off the hot melt plastic in the core 27 and the hot melt plastic in the injection runner 14, thereby achieving the effect of trimming the gate.

[0063] Reference Figure 5-Figure 8 After the two first baffles 121 move into the two injection runners 14, they will continue to move and collide with the two inclined surfaces 61. Then, the two first baffles 121 will continue to move and push the two avoidance blocks 6 to move away from the core 27. Finally, the two first baffles 121 will move into the two sliding cavities 152 and respectively fit with the side walls of the sliding cavities 152 close to the core 27, and the two springs 54 will press the two avoidance blocks 6 against the two first baffles 121. At this time, a sealing structure is formed between the side walls of the sliding cavity 152 close to the core 27, the first baffles 121, and the avoidance blocks 6. If plastic drills into the sliding cavity 152 and the avoidance blocks 6 when the hot melt plastic is injected into the cavity 13, the plastic entering the sliding cavity 152 will be pushed into the connecting channel 55 during the movement of the first baffle 121 to prevent the plastic retained in the sliding cavity from affecting the reset of the avoidance blocks 6.

[0064] Reference Figure 5 , Figure 9-12When the two first baffles 121 move, the output shafts of the two second cylinders 43 retract to drive the two second drive blocks 42 to move closer to the two second cylinders 43. When the two second drive blocks 42 move closer to the second cylinders 43, they will drive the two second sliders 45 to slide away from the movable template 24 through the two T-shaped second inclined grooves 44. When the two second sliders 45 slide away from the movable template 24, they will move the two second matching blocks 41 and the two second baffles 123 away from the movable template 24, so that the two second baffles 123 move out of the two exhaust channels 122, so that the two exhaust channels 122 are connected with the two cavities 13.

[0065] Reference Figure 4 , Figure 5 , Figure 9-12 After the two first baffles 121 move out of the two exhaust channels 122, the external air pump will inject gas into the two cores 27 through the two air inlet needles 25 to assist the molding of the two handrail bodies 9. After the handrail body 9 is gas-assisted molded, the output shafts of the two second oil cylinders 43 extend to drive the two second drive blocks 42 to move away from the two second oil cylinders 43. When the two second drive blocks 42 move away from the two second oil cylinders 43, they drive the two second sliders 45 to slide toward the movable plate 24 through the two T-shaped second inclined grooves 44. When the two second sliders 45 slide toward the movable plate 24, they will move the two second matching blocks 41 and the two second baffles 123 close to the movable plate 24, and finally make the two second baffles 123 move into the two exhaust channels 122 respectively, thereby cutting off the injection waste in the two handrail bodies 9 and the two exhaust channels 122, and achieving the purpose of trimming the gate.

[0066] Reference Figure 6-Figure 8 , Fig.10 , Fig.11 After the gate trimming is completed, the output shafts of the two second oil cylinders 43 retract, causing the two second baffles 123 to move and reset. At the same time, when the two second baffles 123 move out of the two exhaust channels 122, the output shaft of the first oil cylinder 33 retracts, causing the two first baffles 121 to move and reset, thereby exiting the sliding cavity 1 52 and the injection runner 1 14. At this time, due to the undercut relationship between the waste material and the third baffle 81, the spring 54 cannot push the avoidance block 6 to move and reset.

[0067] Reference Figure 1 , Figure 2 and Figure 4 After the gate trimming of the handrail body 9 is completed, the injection molding machine controls the lower mold body 2 to move away from the upper mold body 1. When the lower mold body 2 moves away from the upper mold body 1, the inclined rod 124 will drive the molding block 5 to move away from the assembly part 91, thereby releasing the undercut structure between the molding block 5 and the assembly part 91 so that the injection-molded handrail body 9 can be smoothly demolded.

[0068] Reference Figure 5, Figure 6 and Figure 8 When the molding block 5 moves away from the armrest body 9, it will also move away from the armrest body 9 with the avoidance block 6 and the third baffle 81. When the third baffle 81 moves away from the armrest body 9, it will pull the waste material in the injection runner 14 away from the armrest body 9, completing the separation of the armrest body 9 from the gate. In the process of the third baffle 81 moving away from the core 27, the third baffle 81 will gradually release the undercut relationship with the waste material. After the third baffle 81 moves away from the waste material, the spring 54 will rebound and press the avoidance block 6 against the side wall of the sliding cavity 1 52 close to the core 27.

[0069] Reference Figure 3 After the mold is completely opened, the injection molding machine controls the two ejector plates 22 to move toward the movable platen 24, so that the four groups of ejector pins 26 and the two pull rods 28 push the armrest body 9, the waste in the second injection runner 243, and the waste in the two exhaust cavities 241 out of the movable platen 24. When the ejector pins 26 push the armrest body 9, the air pump blows air into the air inlet pin 25 so that the gas blows the armrest body 9 to float and separate from the core 27, thereby assisting the demolding of the armrest body 9.

[0070] After the two armrest bodies 9 are ejected from the movable template 24, the injection molding machine operator can remove the armrest bodies 9. After the armrest bodies 9 are removed, the injection molding machine operator can re-operate the injection molding machine to reset the two ejector plates 22, so that the four groups of ejector pins 26, the two pulling rods 28, and the multiple air inlet needles 25 are reset, and then the lower mold body 2 is controlled to move toward the upper mold body 1, so that the mold is closed to carry out injection molding of the next group of armrest bodies 9.

[0071] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. An injection molding mold with both air flotation and automatic gate cutting functions, comprising an upper mold body (1) and a lower mold body (2), wherein the upper mold body (1) comprises an upper fixed plate (11), a fixed mold plate (12), two mold cavities (13) opened on the fixed mold plate (12), and two injection flow channels (14), wherein the two injection flow channels (14) are respectively connected to the two mold cavities (13); the lower mold body (2) comprises a lower fixed plate (21), two top plates (22), two mold feet (23), a movable mold plate (24), an air inlet needle (25) and a plurality of ejector needles (26) arranged on the top plate (22), and two mold cores (27) opened on the movable mold plate (24), characterized in that: Two first baffles (121) are slidably connected to the fixed mold plate (12) along the mold opening direction of the mold, and two groups of first driving parts (3) are provided on the fixed mold plate (12). The first driving parts (3) are used to drive the first baffles (121) to slide into the injection flow channel 1 (14) so ​​that the first baffles (121) block the mold cavity (13) and the injection flow channel 1 (14); two exhaust cavities (241) are provided on the movable mold plate (24), and two exhaust channels (122) are provided on the fixed mold plate (12). The channel (122) is connected to the two cavities (13) respectively; the exhaust channel (122) is connected to the exhaust cavity (241) and the cavity (13) when the mold is closed; two second baffles (123) are slidably connected to the fixed mold plate (12) along the mold opening direction of the mold; two groups of second driving parts (4) are provided on the fixed mold plate (12); the second driving parts (4) are used to drive the second baffles (123) to slide into the exhaust channel (122) so that the second baffles (123) block the cavity (13) and the exhaust channel (122); The movable platen (24) is provided with two sliding grooves (242), and a forming block (5) for forming the assembly part (91) is slidably connected in both of the sliding grooves (242); The forming block (5) is provided with a sliding cavity (52), and a avoidance block (6) is slidably connected in the sliding cavity (52); The avoidance block (6) is provided with a third baffle (81), and the third baffle (81) is used to extend into the injection flow channel (14) when the upper mold body (1) and the lower mold body (2) are closed. After the third baffle (81) extends into the injection flow channel (14), it forms a narrow opening (82) with the injection flow channel (14) for preventing hot melt plastic from being sprayed into the mold cavity (13).

2. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 1, characterized in that: The first driving part (3) comprises a first matching block (31) connected to the fixed platen (12) along the mold opening direction of the mold, a first driving block (32) slidably connected to the fixed platen (12) along the mold opening direction perpendicular to the mold, a first oil cylinder (33) for driving the first driving block (32) to slide, a T-shaped first inclined groove (34) provided on the first driving block (32), and a first sliding block (35) provided on the first matching block (31) and slidably matched with the T-shaped first inclined groove (34), wherein the first blocking piece (121) is provided on the first matching block (31), and when the first driving block (32) slides, the first sliding block (35) is driven to slide via the T-shaped first inclined groove (34).

3. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 2, characterized in that: The second driving part (4) comprises a second matching block (41) connected to the fixed platen (12) along the mold opening direction of the mold, a second driving block (42) slidably connected to the fixed platen (12) along the mold opening direction perpendicular to the mold, a second oil cylinder (43) for driving the second driving block (42) to slide, a T-shaped second inclined groove (44) provided on the second driving block (42), and a second sliding block (45) provided on the second matching block (41) and slidably matched with the T-shaped second inclined groove (44), the second blocking piece (123) being provided on the second matching block (41), and when the second driving block (42) slides, the second sliding block (45) is driven to slide via the T-shaped second inclined groove (44).

4. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 1, characterized in that: The two sliding grooves (242) are respectively connected to the two cores (27); the fixed mold plate (12) is provided with two inclined rods (124); the two molding blocks (5) are both provided with inclined holes (51); the two inclined rods (124) are respectively plugged into the two inclined holes (51); the inclined rods (124) cooperate with the inclined holes (51) to convert the power of opening and closing the upper mold body (1) and the lower mold body (2) into the power of sliding the molding blocks (5).

5. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 4, characterized in that: The avoidance block (6) is provided with an inclined surface (61) on one side facing the core (27); a sliding cavity (53) is provided on the side wall of the sliding cavity (52) away from the core (27); one end of the avoidance block (6) extends into the sliding cavity (53); a spring (54) is provided in the sliding cavity (53); the elastic force of the spring (54) acts on the avoidance block (6); when no external force is applied, the spring (54) presses the avoidance block (6) against the side wall of the sliding cavity (52) close to the core (27); when the mold is closed, the inclined surface (61) and the sliding cavity (52) are located on the movement path of the first baffle (121).

6. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 5, characterized in that: The avoidance block (6) is provided with a stopper (7), the stopper (7) being located on a side of the avoidance block (6) away from the core (27), the stopper (7) being attached to and slidably connected to the surface of the molding block (5), the stopper (7) being used to form a blocking structure with the avoidance block (6) to prevent hot melt plastic from entering the sliding cavity (53), and the stopper (7) extending into the injection runner (14) when the mold is closed.

7. The injection molding mold with both air flotation and automatic gate cutting functions according to claim 5, characterized in that: The forming block (5) is provided with a connecting channel (55) connecting the outside world and the sliding cavity (52). When the mold is closed, the channel openings of the connecting channel (55) and the sliding cavity (52) face the first baffle (121).

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