Lunch box body injection mold

Abstract

The invention provides a lunch box body injection mold which comprises a fixed mold with a mold cavity and a movable mold arranged below the fixed mold, the movable mold comprises a lower fixing plate, a plurality of mold feet are arranged on the lower fixing plate, a lower movable mold plate is arranged on the mold feet, a mold core hole is formed in the top face of the lower movable mold plate, a mold core is inserted in the mold core hole, and a mold core is arranged in the mold core hole. The mold core is inserted into a mold cavity of the fixed mold, an insert groove is formed in the top face of the mold core in a penetrating mode, a demolding insert and a side insert are embedded in the insert groove, a transverse narrow slit and a vertical narrow slit are formed in the top face of the mold core, and the transverse narrow slit and the vertical narrow slit are arranged on the mold core, the demolding insert and the side insert in a split mode. According to the mold core of the lunch box body injection mold, the demolding insert and the side insert are spliced in a manner of forming the insert groove, so that a plurality of narrow slits are decomposed, the narrow slits are partially positioned on the mold core, and the other parts of the narrow slits are positioned on the demolding insert or the side insert, so that during processing, the use of a slender cutter with insufficient rigidity can be reduced, the processing difficulty of the mold core is favorably reduced, and the production efficiency is improved. The cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an injection mold for a lunch box body. Background Art

[0002] Injection molds are core process equipment used alongside injection molding machines in the plastics processing industry. Molten plastic is injected into the mold cavity, where it cools and solidifies to create a plastic product with a defined shape and size. The molding components of an injection mold are those that come into direct contact with the molten plastic and determine the shape and size of the part. These components primarily include a fixed mold, a movable mold (core), and a cavity. The fixed mold forms the exterior surface of the part, the movable mold forms the interior, and the cavity is the space within which the part is formed.

[0003] A lunch box, also known as a bento box, is a container specifically designed for holding meals. Typically made of materials such as aluminum, stainless steel, and plastic, it primarily consists of a box body and a lid. Its core function is to ensure food hygiene while providing a portable dining solution to meet people's dietary needs while working, studying, or traveling.

[0004] like Figure 1 As shown, a lunch box body is fixedly connected with horizontal bars and vertical bars, which are slender and thin-walled and arranged perpendicularly to each other. The horizontal bars and vertical bars divide the interior of the lunch box body into rice compartments and vegetable compartments.

[0005] The above-mentioned existing technical solutions have the following defects: since the lunch box body has slender, thin-walled horizontal and vertical pieces, the core of the lunch box body injection mold needs to have multiple narrow slits for forming the horizontal and vertical pieces. The narrow slits are deep and narrow grooves. When processing the core, a slender tool needs to be used to process the multiple narrow slits. Since the slender tool has insufficient rigidity, it is easy to vibrate during the cutting process. The accumulated errors in processing multiple narrow slits can easily cause the slender tool to break. Therefore, the core of the existing lunch box body injection mold has the problem of difficulty in processing. Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a lunch box body injection mold in view of the above-mentioned deficiencies in the prior art, which solves the problem of difficult processing in the prior art.

[0007] The above-mentioned object of the present invention is achieved through the following technical solutions: A lunch box body injection mold, comprising a fixed mold with a mold cavity and a movable mold arranged below the fixed mold, the movable mold comprising a lower fixed plate, a plurality of mold feet are arranged on the lower fixed plate, a lower movable mold plate is arranged on the mold feet, a core hole is provided on the top surface of the lower movable mold plate, a core is inserted into the core hole, the core is inserted into the mold cavity of the fixed mold, an insert groove is provided on the top surface of the core, a demolding insert and a side insert are embedded in the insert groove, a horizontal narrow slit and a vertical narrow slit are provided on the top surface of the core, and the horizontal narrow slit and the vertical narrow slit are separately provided on the core, the demolding insert and the side insert.

[0008] The present invention is further configured as follows: a flange embedded in the core hole is provided at the bottom of the outer side wall of the core, the core is fixed to the lower movable template by the flange, an upper movable template is provided on the lower movable template, the upper movable template presses the flange of the core into the core hole, and a core through-hole is provided in the middle of the upper movable template for the core, demolding insert and side insert to pass through.

[0009] The present invention is further configured as follows: the side inserts are fixed to the lower movable template via locking screws.

[0010] The present invention is further configured as follows: a guide rod hole is opened on the bottom wall of the core hole, a connecting rod is provided on the bottom surface of the demolding insert, the connecting rod passes through the guide rod hole that slides with the demolding insert, a connecting head is provided on the bottom surface of the connecting rod, a pin plate is slidably provided between the lower fixed plate and the lower movable template, a connecting device is provided on the top surface of the pin plate, and the connecting device centers and clamps the connecting rod while locking and fixing the connecting head.

[0011] The present invention is further configured as follows: a locking ring groove is circumferentially provided on the connector, the connecting device includes a locker, the locker is arranged on the ejector plate through a connecting seat, the locker includes an outer body with an inner cavity inside, a through hole for the connector to pass through is provided on the top surface of the outer body, a plurality of plug guide grooves are provided on the cavity wall of the inner cavity, a locking plug is slidably provided in the plug guide groove, and a locking component is provided in the outer body for driving the locking plug to perform reciprocating linear motion along the plug guide groove, thereby controlling the locking plug to be inserted into or withdrawn from the locking ring groove.

[0012] The present invention is further configured as follows: a plurality of mounting grooves are provided on the cavity wall of the inner cavity, the upper ends of the mounting grooves are connected to the plug guide grooves, the thickness of the mounting grooves is smaller than the diameter of the plug guide grooves, the locking assembly includes a middle slide and a hinge rod, the middle slide is slidably arranged in the inner cavity, a hinge groove is provided on the side wall of the middle slide, a locking hinge seat extending into the mounting groove is provided on the side wall of the locking plug, one end of the hinge rod is hinged to the middle slide through a pin shaft fixed in the hinge groove, and the other end is hinged to the locking plug through the locking hinge seat, and the hinge point of the hinge rod and the middle slide is located on the lower inner side of the hinge point of the hinge rod and the locking plug.

[0013] The present invention is further configured as follows: a middle sliding column is provided on the end surface of the middle sliding table away from the through-hole, and a push-plate spring is sleeved on the middle sliding column, one end of the push-plate spring is against the middle sliding table, and the other end is against the bottom wall of the inner cavity.

[0014] The present invention is further configured as follows: a fixing column is provided on the top surface of the connecting seat, a movable guide hole extending into the connecting seat is opened on the top surface of the fixing column, the bottom of the outer body is inserted into the movable guide hole slidingly matched therewith, a plurality of linked hinged seats are provided on the outer side wall of the outer body, a hinged base is provided on the top surface of the connecting seat, a centering clamp is hinged on the hinged base, the centering clamp is hinged to a linkage frame, and the end of the linkage frame away from the centering clamp is hinged to the outer body through a linkage hinged seat.

[0015] The present invention is further configured as follows: a pusher spring is provided in the movable guide hole, one end of the pusher spring abuts against the bottom surface of the outer body, and the other end abuts against the bottom wall of the movable guide hole.

[0016] The present invention is further configured as follows: an upper ejector hole is provided on the top surface of the demolding insert, a lower ejector hole aligned with the upper ejector hole is provided on the bottom wall of the core hole, an ejector cylinder is provided on the top surface of the connecting seat, which passes through the lower ejector hole and the upper ejector hole in sequence, and an ejector guide hole, a piston cavity and an oil cavity are sequentially provided on the top surface of the ejector cylinder downwardly, an ejector rod is slidably provided in the ejector guide hole, a forming head is provided on the top of the ejector rod, a piston plate slidably matched with the piston cavity is provided at the bottom of the ejector rod, a return spring is sleeved on the ejector rod, the upper end of the return spring is abutted against the top wall of the piston cavity, and the lower end of the return spring is abutted against the top surface of the piston plate, an oil filling pipe is provided on the outer wall of the ejector cylinder, and the oil filling pipe is connected to a hydraulic device, which is used to inject oil into the oil cavity to push the piston plate, the ejector rod and the forming head upward.

[0017] In summary, the beneficial technical effects of the present invention are:

[0018] (1) The core of the lunch box body injection mold is spliced ​​with the demoulding insert and the side insert by providing an insert groove, so that a plurality of horizontal narrow slits and vertical narrow slits are separately provided on the core, the demoulding insert and the side insert that can be processed separately. Therefore, during processing, the use of slender tools with insufficient rigidity can be reduced, which is conducive to reducing the processing difficulty of the core and reducing costs;

[0019] (2) A connecting device is provided on the ejector plate of the lunch box body injection mold. The connecting device locks and fixes the connecting head while centering and clamping the connecting rod. The demoulding insert is connected to the ejector plate through the connecting device, the connecting head, and the connecting rod. Since the connecting rod is positioned by centering and clamping, the demoulding insert can stably perform the demoulding work;

[0020] (3) When replacing the demoulding insert of the lunch box body injection mold, the demoulding insert can be directly disassembled and replaced on the injection mold without disassembling the entire injection mold. The demoulding insert is easy to disassemble and replace, which greatly shortens the downtime of the injection mold;

[0021] (4) For thin-walled parts such as lunch box bodies, the lunch box body injection mold adopts a demoulding insert to complete the first demoulding work, and adopts a ejector rod with a forming head to complete the second demoulding work. Two gentler demoulding actions are used instead of sequential strong demoulding that may be destructive, so that the lunch box body with thin-walled horizontal and vertical bars can be safely and reliably ejected, which is beneficial to avoid the risk of the lunch box body being penetrated due to excessive single ejection force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of a lunch box body in the prior art;

[0023] Figure 2 It is a structural schematic diagram of the lunch box body injection mold of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the fixed mold in the present invention;

[0025] Figure 4 It is a schematic diagram of the explosion structure of the movable mold in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the movable mold in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the connecting device in the present invention;

[0028] Figure 7 It is a cross-sectional structural diagram of the connecting device of the present invention from a first viewing angle;

[0029] Figure 8 is a cross-sectional structural diagram of the connecting device of the present invention from a second viewing angle;

[0030] Figure 9 It is a partial cross-sectional structural diagram of the ejector cylinder in the present invention;

[0031] Figure 10 It is a structural schematic diagram of the ejector cylinder and the hydraulic device in the present invention.

[0032] In the above drawings: 1, lunch box body; 2, horizontal rail; 3, vertical rail; 4, fixed mold; 5, upper fixed plate; 6, fixed plate; 7, mold cavity; 8, gate; 9, sprue; 10, mounting hole; 11, straight guide pin; 12, movable mold; 13, lower fixed plate; 14, mold foot; 15, lower movable plate; 16, upper movable plate; 161, fixing screw; 162, core hole; 17, guide pin hole; 18, ejector plate; 19, needle plate guide hole; 20, needle plate guide pin; 21 , return spring; 22, core hole; 23, core; 24, horizontal narrow slit; 25, vertical narrow slit; 26, flange; 27, locking screw; 28, insert groove; 29, demoulding insert; 30, side insert; 31, locking screw; 32, guide rod hole; 33, connecting rod; 34, connector; 35, locking ring groove; 36, connecting device; 37, connecting seat; 38, fixing column; 39, movable guide hole; 40, lock; 41, outer body; 42, inner cavity ;43. Through-hole;44. Plug guide groove;45. Mounting groove;46. Locking plug;47. Locking hinge seat;48. Middle slide;49. Positioning socket;50. Middle slide column;51. Push-table spring;52. Hinge groove;53. Hinge rod;54. Hinge base;55. Centering clamp;56. Clamp hinge shaft;57. Linking hinge seat;58. Linking frame;59. Linking hinge shaft;60. Ejector spring;61. Locking screw hole;62. Inner lock Fixed through-hole; 63. External locking through-hole; 64. Locking screw; 65. Upper ejector hole; 66. Lower ejector hole; 67. Ejector cylinder; 68. Ejector guide hole; 69. Piston chamber; 70. Oil chamber; 71. Ejector rod; 72. Forming head; 73. Piston plate; 74. Return spring; 75. Sealing groove; 76. Sealing ring; 77. Oil filling pipe; 78. Oil tank; 79. Hydraulic pump; 80. Oil inlet pipe; 81. Oil outlet pipe; 82. Solenoid valve; 83. Connecting pipe. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further explained below with reference to the accompanying drawings and specific implementation methods.

[0034] like Figure 2 As shown, the present invention provides an injection mold for a lunch box body, comprising a fixed mold 4 and a movable mold 12.

[0035] like Figure 2 and 3As shown, the fixed mold 4, also known as the female mold, is used to shape the outer surface of the lunch box body 1. The fixed mold 4 is fixedly mounted on the fixed base of the injection molding machine and includes an upper fixed plate 5 and a fixed plate 6. The fixed plate 6 is screwed to the upper fixed plate 5 via screws penetrated through the top surface of the upper fixed plate 5. A mold cavity 7 is defined on the end surface of the fixed plate 6 facing the movable mold 12. A gate 8 and a sprue 9 are defined in the center of the top surface of the upper fixed plate 5, which are connected in sequence. The molten plastic ejected from the nozzle of the injection molding machine passes through the gate 8 and sprue 9 in sequence and enters the mold cavity 7.

[0036] like Figure 3 As shown, four mounting holes 10 are opened through the fixed template 6. The mounting holes 10 are circular holes. The four mounting holes 10 are close to the four corners of the fixed template 6. A cylindrical straight guide column 11 is inserted into the mounting hole 10. The top of the straight guide column 11 is screwed to the fixed template 6.

[0037] like Figure 2 As shown, the movable mold 12 is also called the male mold, and the movable mold 12 is used to form the inner surface of the lunch box body 1, the horizontal piece 2 and the vertical piece 3. The movable mold 12 is fixedly mounted on the movable seat of the injection molding machine, and the movable mold 12 includes a lower fixed plate 13, a mold foot 14, a lower movable mold plate 15, and an upper movable mold plate 16.

[0038] like Figure 2 and 5 As shown, the lower fixed plate 13 is a rectangular plate, the number of the mold feet 14 is two, the two mutually symmetrical mold feet 14 are screwed to the lower fixed plate 13, and the lower movable plate 15 is screwed to the two mold feet 14.

[0039] like Figure 3 and 5 As shown, a guide post hole 17 is opened on the end surface of the movable mold 12 facing the fixed mold 4. The guide post hole 17 is a circular hole. There are four guide post holes 17. The four guide post holes 17 are respectively close to the four corners of the movable mold 12. The guide post holes 17 pass through the upper movable template 16 and the lower movable template 15 in sequence. The guide post holes 17 slide with the straight guide post 11, so that the lunch box body injection mold can stably perform demoulding and mold closing.

[0040] like Figure 2 and 4As shown, an ejector plate 18 slides between the lower fixed plate 13 and the lower movable plate 15. The ejector plate 18 is positioned between the two mold legs 14 and has four circular needle plate guide holes 19 arranged in a rectangular pattern. Four needle plate guide posts 20 are positioned between the lower fixed plate 13 and the lower movable plate 15. Each of the four posts is positioned between the two mold legs 14 and has a rectangular pattern. They slide between the guide holes 19, with their upper ends abutting the bottom surface of the lower movable plate 15 and their lower ends screwed to the lower fixed plate 13. Each of the needle plate guide posts 20 is fitted with a return spring 21, one end of which abuts the lower movable plate 15 and the other end abuts the ejector plate 18. The return spring 21 serves to reset the ejector plate 18. When the lunch box body injection mold is installed on an injection molding machine for use, the ejector plate 18 is driven by the ejection cylinder of the injection molding machine to do reciprocating linear motion.

[0041] When the injection mold of the lunch box body enters the demoulding stage, the piston rod of the ejector cylinder extends, and the piston rod of the ejector cylinder penetrates the opening of the lower fixed plate 13 and pushes the ejector plate 18 upward. At this time, the return spring 21 is converted into a compressed state. When the piston rod of the ejector cylinder retracts, the elastic force generated by the return spring 21 will push the ejector plate 18 back to its initial position.

[0042] like Figure 4 and 5 As shown, a core hole 22 is formed on the top surface of the lower movable platen 15, into which a core 23 is inserted. The core 23 is inserted into the mold cavity 7 of the fixed mold 4. The gap between the core 23 and the wall of the mold cavity 7 forms the mold cavity for forming the lunch box body 1. Two horizontal narrow slits 24 and two vertical narrow slits 25 are formed on the top surface of the core 23. The two horizontal narrow slits 24 are used to form the two horizontal rails 2 in the lunch box body 1, and the two vertical narrow slits 25 are used to form the two vertical rails 3 in the lunch box body 1.

[0043] like Figure 4 As shown, a flange 26 extends outward from the bottom of the outer wall of the core 23, and the flange 26 is completely embedded in the core hole 22. The flange 26 is fixed to the lower movable template 15 by a locking screw 27. The locking screw 27 is passed through the bottom surface of the lower movable template 15, and the bottom surface of the lower movable template 15 is provided with a countersunk hole to accommodate the locking screw 27.

[0044] like Figure 4As shown, an insert groove 28 is provided on the top surface of the core 23, and the insert groove 28 is "L"-shaped. A demoulding insert 29 and a side insert 30 are embedded in the insert groove 28. Two horizontal narrow slits 24 are evenly arranged on the core 23, the demoulding insert 29 and the side insert 30. Two vertical narrow slits 25 are evenly arranged on the core 23, the demoulding insert 29 and the side insert 30. The core 23, the demoulding insert 29 and the side insert 30 can be processed separately. When processing the demoulding insert 29 and the side insert 30, there is no need to use a slender tool. When processing the core 23, only a small section of the vertical narrow slit 25 that has not been separated requires a slender tool.

[0045] The upper movable template 16 is fixed to the lower movable template 15 by four fixing screws 161. The upper movable template 16 presses and fixes the flange 26 of the core 23 in the core hole 22. A core hole 162 is provided in the middle of the upper movable template 16 for the core 23, the demolding insert 29 and the side insert 30 to pass through.

[0046] The core 23 of the injection mold for the lunch box body is spliced ​​with the demoulding insert 29 and the side insert 30 by providing an insert groove 28, so that the multiple horizontal narrow slits 24 and the vertical narrow slits 25 are separately provided on the core 23, the demoulding insert 29 and the side insert 30 that can be processed separately. Therefore, during processing, the use of slender tools with insufficient rigidity can be reduced, which is conducive to reducing the processing difficulty of the core 23 and reducing costs.

[0047] like Figure 4 As shown, the side insert 30 is fixed to the lower movable template 15 by means of locking screws 31. There are two locking screws 31. The two locking screws 31 are passed through the bottom surface of the lower movable template 15. The bottom surface of the lower movable template 15 is provided with countersunk holes to accommodate the locking screws 31.

[0048] like Figure 4 and 7 As shown, a circular guide rod hole 32 is defined in the bottom wall of the core hole 22. A cylindrical connecting rod 33 is fixedly connected to the bottom surface of the demolding insert 29. Sliding engagement between the connecting rod 33 and the guide rod hole 32 allows for stable reciprocating linear motion. A cylindrical connector 34 is coaxially connected to the bottom surface of the connecting rod 33. The diameter of the connector 34 is smaller than that of the connecting rod 33, and a semicircular locking ring groove 35 is defined circumferentially on the sidewall of the connector 34.

[0049] like Figure 6 As shown, a connecting device 36 is provided on the top surface of the ejector plate 18. The connecting device 36 centers and clamps the connecting rod 33 while locking and fixing the connecting head 34. The ejector plate 18 is connected to the demolding insert 29 through the connecting device 36, the connecting head 34 and the connecting rod 33.

[0050] like Figure 6 As shown, the connecting device 36 includes a connecting seat 37 and a locker 40 .

[0051] like Figure 6 As shown, the connecting seat 37 is a circular plate and is screwed to the top surface of the ejector plate 18. A fixing post 38 is coaxially fixed to the center of the top surface of the connecting seat 37. The fixing post 38 is cylindrical and has a movable guide hole 39 formed on its top surface. The movable guide hole 39 is a circular hole, and the bottom of the movable guide hole 39 extends into the connecting seat 37.

[0052] like Figure 7 As shown, the locking device 40 is used to lock and secure the connector 34. The locking device 40 includes an outer body 41. The outer body 41 is cylindrical and has an inner cavity 42 at its center. The inner cavity 42 is a cylindrical chamber. A through-hole 43 is formed at the center of the top surface of the outer body 41. The through-hole 43 is a circular hole that communicates with the inner cavity 42. The connector 34 extends through the through-hole 43 into the inner cavity 42 of the outer body 41.

[0053] like Figure 7 As shown, two plug guide grooves 44 and two mounting grooves 45 are symmetrically opened on the cavity wall of the inner cavity 42. The plug guide groove 44 is a circular groove, and the mounting groove 45 is a rectangular groove. The two mounting grooves 45 are respectively located below the two plug guide grooves 44. The upper ends of the mounting grooves 45 are connected to the plug guide grooves 44. The thickness of the mounting grooves 45 is smaller than the diameter of the plug guide grooves 44.

[0054] like Figure 7 As shown, a locking plug 46 is slidably provided in each plug guide groove 44. The locking plug 46 is a hemispherical cylinder. The hemispherical head of the locking plug 46 can be plugged into the locking slide groove of the connector 34. A locking hinge seat 47 extending into the mounting groove 45 is fixedly connected to the side wall of the locking plug 46.

[0055] like Figure 7 As shown, a locking assembly is provided in the outer body 41 , and the locking assembly is used to drive the locking plug 46 to perform reciprocating linear motion along the plug guide groove 44 , thereby controlling the locking plug 46 to be inserted into or withdrawn from the locking ring groove 35 .

[0056] The locking assembly includes a middle slide 48 and a hinge rod 53. The middle slide 48 is cylindrical and slides in the inner cavity 42. A positioning hole 49 is provided on the end surface of the middle slide 48 facing the through-hole 43. The positioning hole 49 is a circular hole and engages with the connector 34. A middle slide column 50 is coaxially fixedly connected to the end surface of the middle slide 48 facing away from the through-hole 43. A push spring 51 is sleeved on the middle slide column 50. One end of the push spring 51 abuts against the middle slide 48, and the other end abuts against the bottom wall of the inner cavity 42. The push spring 51 is used to push the middle slide 48 toward the through-hole 43. Two hinge grooves 52 are symmetrically provided on the side wall of the middle slide 48. One end of the hinge rod 53 is hinged to the middle slide 48 through a pin fixed in the hinge groove 52, and the other end is hinged to the locking plug 46 through a locking hinge seat 47. The hinge point of the hinge rod 53 and the middle slide 48 is located on the lower inner side of the hinge point of the hinge rod 53 and the locking plug 46.

[0057] like Figure 6 As shown, three articulated bases 54 are fixedly connected to the top surface of the connecting base 37. The three articulated bases 54 are equidistantly distributed on the circumference. A centering jaw 55 is hinged on each articulated base 54. The centering jaw 55 is hinged to the articulated base 54 through a jaw articulated shaft 56. The jaw articulated shaft 56 passes through the lower end of the articulated base 54 and the centering jaw 55 at the same time. The jaw articulated shaft 56 is fixed to the articulated base 54 by slotting at both ends and arranging a retaining spring. The centering jaw 55 is rotatably set on the jaw articulated shaft 56.

[0058] like Figure 6 As shown, three linkage hinge seats 57 are fixedly connected to the top of the outer wall of the outer body 41. The three linkage hinge seats 57 are equidistantly distributed around the circumference. Each linkage hinge seat 57 is hingedly connected to a linkage frame 58. The linkage frame 58 is in the shape of an "I". One end of the linkage frame 58 away from the linkage hinge seat 57 is hinged to the middle of the centering clamp 55. The two ends of the linkage frame 58 are respectively hinged to the centering clamp 55 and the linkage hinge seat 57 through two linkage hinge shafts 59. One linkage hinge shaft 59 passes through both the centering clamp 55 and the linkage hinge seat 57, and the other linkage hinge shaft 59 passes through both the linkage hinge seat 57 and the linkage frame 58. The linkage hinge shaft 59 is fixed by slotting at both ends and being provided with a retaining spring. The linkage hinge shaft 59 is rotatably connected to the linkage frame 58.

[0059] like Figure 7 As shown, the bottom of the outer body 41 is inserted into the movable guide hole 39, and the outer body 41 slides in cooperation with the movable guide hole 39. A pusher spring 60 is disposed in the movable guide hole 39. One end of the pusher spring 60 abuts against the bottom surface of the outer body 41, and the other end abuts against the bottom wall of the movable guide hole 39. The pusher spring 60 is used to push the outer body 41 upward.

[0060] like Figure 8As shown, a locking screw hole 61 is provided on the side wall of the middle slide 48, an inner locking through hole 62 is provided on the side wall of the outer body 41, and an outer locking through hole 63 is provided on the side wall of the fixing column 38. A locking screw 64 threadedly connected to the locking screw hole 61 is provided through the inner locking through hole 62 and the outer locking through hole 63.

[0061] The detailed installation process of the demoulding insert 29 in this embodiment is as follows:

[0062] S1: The flange 26 of the core 23 is fixed to the lower movable platen 15 by the locking screw 27. The side insert 30 is fixed to the lower movable platen 15 by the locking screw 31. The worker places the demoulding insert 29 into the insert groove 28 and passes the connecting rod 33 through the guide rod hole 32 that slides with it.

[0063] S2: The demoulding insert 29, the connecting rod 33 and the connecting head 34 continue to descend until the connecting head 34 extends into the inner cavity 42 of the outer body 41 through the through-hole 43, and then the connecting head 34 is inserted into the positioning socket 49 of the middle slide 48. The connecting head 34 continues to descend, which will push the middle slide 48 to move away from the through-hole 43 until the bottom surface of the middle slide 50 abuts against the bottom wall of the inner cavity 42. At this time, the bottom wall of the connecting rod 33 abuts against the top surface of the outer body 41. In this process, since the hinge point of the hinge rod 53 and the middle slide 48 is located on the inner and lower side of the hinge point of the hinge rod 53 and the locking plug 46, the hinge rod 53 will drive the two locking plugs 46 to insert into the locking ring groove 35 of the connecting head 34. At this time, the locker 40 completes the locking and fixing work of the connecting head 34.

[0064] S3: The connecting rod 33 continues to move downward, pushing the locker 40 with the outer body 41 downward until the linkage hinge seat 57 abuts against the top surface of the fixed column 38. During this process, the linkage hinge seat 57 moves downward, driving the top of the centering jaw 55 to move inward through the linkage frame 58. The three centering jaws 55 clamp and center the connecting rod 33, and at this time the locking screw hole 61, the inner locking through-hole 62 and the outer locking through-hole 63 are aligned. The worker passes the locking screw 64 through the outer locking through-hole 63 and the inner locking through-hole 62 in turn and then threads it into the locking screw hole 61.

[0065] A connecting device 36 is provided on the ejector plate 18 of the injection mold of the lunch box body. The connecting device 36 centeringly clamps the connecting rod 33 while locking and fixing the connecting head 34. The demoulding insert 29 is connected to the ejector plate 18 through the connecting device 36, the connecting head 34 and the connecting rod 33. Since the connecting rod 33 is positioned by centering and clamping, the demoulding insert 29 can stably perform the demoulding work.

[0066] The detailed disassembly process of the demoulding insert 29 in this embodiment is as follows:

[0067] S1: The ejector plate 18 moves upward, pushing the demoulding insert 29 upward until the top of the demoulding insert 29 slides out of the insert groove 28.

[0068] Provide a force point for workers to take the demoulding insert 29;

[0069] S2: The worker first removes the locking screw 64, then slides the demoulding insert 29 out of the top of the insert groove 28 and lifts the demoulding insert 29 upward until the weight of the demoulding insert 29 is no longer applied to the middle slide 48 of the locker 40. The compressed ejector spring 60 pushes the locker 40 upward, and the linked hinge seat 57 moves upward accordingly. The upward movement of the linked hinge seat 57 pushes the top of the centering clamp 55 outward through the linkage frame 58, and the three centering clamps 55 release the centering clamping force on the connecting rod 33.

[0070] S3: Since the weight of the demoulding insert 29 is not applied to the middle slide 48 of the locker 40, the compressed push spring 51 pushes the middle slide 48 toward the through hole 43. Since the hinge point between the hinge rod 53 and the middle slide 48 is located below and inside the hinge point between the hinge rod 53 and the locking plug 46, the hinge rod 53 drives the two locking plugs 46 to withdraw from the locking ring groove 35 of the connector 34.

[0071] S4: The worker continues to pull up the demoulding insert 29 to remove the demoulding insert 29.

[0072] When the stripping insert 29 of the lunch box body injection mold is replaced, it can be directly disassembled and replaced on the injection mold without disassembling the entire injection mold. The stripping insert 29 is easy to disassemble and replace, which greatly shortens the downtime of the injection mold.

[0073] like Figure 2 and 4 As shown, three upper circular ejector holes 65 are formed through the top surface of the demolding insert 29. Three lower ejector holes 66 are formed through the bottom wall of the core hole 22. These lower ejector holes 66 are circular holes of the same diameter as the upper ejector holes 65. The three lower ejector holes 66 are equidistantly distributed around the outside of the guide rod hole 32 and are aligned with the three upper ejector holes 65. Three cylindrical ejector tubes 67 are fixedly connected to the top surface of the connecting seat 37. The ejector tubes 67 pass through the lower ejector holes 66 and the upper ejector hole 65 in sequence from bottom to top, and slide in engagement with the lower ejector holes 66 and the upper ejector holes 65.

[0074] like Figure 9As shown, an ejector guide hole 68, a piston cavity 69 and an oil cavity 70 are sequentially opened on the top surface of the ejector cylinder 67 downwardly. The cross sections of the ejector guide hole 68, the piston cavity 69 and the oil cavity 70 are all circular. A cylindrical ejector rod 71 is slidably arranged in the ejector guide hole 68. The top of the ejector rod 71 is fixedly connected to a forming head 72, and the bottom of the ejector rod 71 is fixedly connected to a piston plate 73. The piston plate 73 slides with the piston cavity 69. A return spring 74 is sleeved on the ejector rod 71. The upper end of the return spring 74 abuts against the top wall of the piston cavity 69, and the lower end of the return spring 74 abuts against the top surface of the piston plate 73. The return spring 74 drives the ejector rod 71 and the forming head 72 back to the initial forming position by pushing the piston plate 73 downward.

[0075] like Figure 9 As shown, a sealing groove 75 is circumferentially opened on the outer circumferential surface of the piston plate 73, and a sealing ring 76 is embedded in the sealing groove 75. The sealing ring 76 forms a seal between the piston plate 73 and the cavity wall of the piston cavity 69, thereby limiting the leakage of hydraulic oil to the top of the piston plate 73 to a certain extent.

[0076] like Figure 10 As shown, an oil filling pipe 77 is fixedly connected to the outer wall of the ejector cylinder 67, and the oil filling pipe 77 is connected to the oil chamber 70. The oil filling pipe 77 is connected to a hydraulic device for injecting oil into the oil chamber 70 to push the piston plate 73, the ejector rod 71, and the forming head 72 upward. The hydraulic device includes an oil tank 78, a hydraulic pump 79, an oil inlet pipe 80, an oil outlet pipe 81, a solenoid valve 82, and a connecting pipe 83.

[0077] like Figure 10 As shown, the oil tank 78 is used to store hydraulic oil, and the hydraulic pump 79 is fixedly installed on the top surface of the oil tank 78. The inlet of the hydraulic pump 79 is connected to an oil inlet pipe 80 extending into the oil tank 78, the oil outlet pipe 81 is connected between the outlet of the hydraulic pump 79 and the inlet of the solenoid valve 82, and the connecting pipe 83 is connected between the oil filling pipe 77 and the outlet of the solenoid valve 82.

[0078] The detailed demoulding process of the lunch box body injection mold is as follows:

[0079] S1: The upward movement of the ejector plate 18 pushes the demoulding insert 29 upward. The demoulding insert 29 moves upward to a position where the lunch box body 1 is ejected from the core 23 and the side insert 30. At this time, the demoulding insert 29 is not completely separated from the insert groove 28. When the mold is closed, the insert groove 28 can guide the demoulding insert 29, and the horizontal rail 2 and the vertical rail 3 have completed a partial demoulding work.

[0080] S2: The hydraulic pump 79 draws the hydraulic oil from the oil tank 78 through the oil inlet pipe 80, pressurizes the hydraulic oil, converts it into high-pressure hydraulic oil and outputs it. The hydraulic oil passes through the oil outlet pipe 81, the solenoid valve 82, and the connecting pipe 83 in sequence and enters the oil chamber 70. The high-pressure hydraulic oil will push the piston plate 73, the ejector rod 71 and the forming head 72 upward until the lunch box body 1 is ejected from the demoulding insert 29.

[0081] For thin-walled parts such as the lunch box body 1, the lunch box body injection mold adopts a demolding insert 29 to complete the first demolding work, and adopts a ejector rod 71 with a forming head 72 to complete the second demolding work. Two gentler demolding actions are used instead of sequential strong demolding that may be destructive, so as to safely and reliably eject the lunch box body 1 with the thin-walled horizontal piece 2 and the thin-walled vertical piece 3, which is beneficial to avoid the risk of the lunch box body 1 being penetrated due to excessive single ejection force.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lunch box body injection mold, comprising a fixed mold (4) having a mold cavity (7), and a movable mold (12) disposed below the fixed mold (4), wherein the movable mold (12) comprises a lower fixed plate (13), a plurality of mold feet (14) are disposed on the lower fixed plate (13), and a lower movable mold plate (15) is disposed on the mold feet (14), characterized in that: A core hole (22) is provided on the top surface of the lower movable template (15), a core (23) is inserted into the core hole (22), and the core (23) is inserted into the mold cavity (7) of the fixed mold (4). An insert groove (28) is provided on the top surface of the core (23), a demoulding insert (29) and a side insert (30) are embedded in the insert groove (28), and a horizontal narrow slit (24) and a vertical narrow slit (25) are provided on the top surface of the core (23), and the horizontal narrow slit (24) and the vertical narrow slit (25) are separately arranged on the core (23), the demoulding insert (29) and the side insert (30).

2. The lunch box body injection mold according to claim 1, characterized in that: The bottom of the outer wall of the core (23) is provided with a flange (26) embedded in the core hole (22), and the core (23) is fixed to the lower movable template (15) through the flange (26). The lower movable template (15) is provided with an upper movable template (16), and the upper movable template (16) presses and fixes the flange (26) of the core (23) in the core hole (22). The middle part of the upper movable template (16) is provided with a core hole (162) for the core (23), the demoulding insert (29) and the side insert (30) to pass through.

3. The lunch box body injection mold according to claim 1, characterized in that: The side insert (30) is fixed on the lower movable template (15) through a locking screw (31).

4. The lunch box body injection mold according to claim 1, characterized in that: A guide rod hole (32) is provided on the bottom wall of the core hole (22), a connecting rod (33) is provided on the bottom surface of the demoulding insert (29), the connecting rod (33) passes through the guide rod hole (32) slidably matched with the core hole, a connecting head (34) is provided on the bottom surface of the connecting rod (33), an ejector plate (18) is slidably provided between the lower fixed plate (13) and the lower movable plate (15), a connecting device (36) is provided on the top surface of the ejector plate (18), and the connecting device (36) centers and clamps the connecting rod (33) while locking and fixing the connecting head (34).

5. The lunch box body injection mold according to claim 4, characterized in that: A locking ring groove (35) is provided on the circumference of the connector (34), and the connecting device (36) includes a locker (40), which is arranged on the ejector plate (18) through a connecting seat (37). The locker (40) includes an outer body (41) with an inner cavity (42) inside, and a through hole (43) for the connector (34) to pass through is provided on the top surface of the outer body (41). A plurality of plug guide grooves (44) are provided on the cavity wall of the inner cavity (42), and a locking plug (46) is slidably provided in the plug guide groove (44). A locking component is provided in the outer body (41) for driving the locking plug (46) to make reciprocating linear motion along the plug guide groove (44), thereby controlling the locking plug (46) to be inserted into or withdrawn from the locking ring groove (35).

6. The lunch box body injection mold according to claim 5, characterized in that: A plurality of mounting grooves (45) are provided on the wall of the inner cavity (42), the upper ends of the mounting grooves (45) are connected to the plug guide groove (44), the thickness of the mounting grooves (45) is smaller than the diameter of the plug guide groove (44), the locking assembly includes a middle slide (48) and a hinge rod (53), the middle slide (48) is slidably arranged in the inner cavity (42), the side wall of the middle slide (48) is provided with a hinge groove (52 ... A locking hinge seat (47) extending into the mounting groove (45) is provided on the side wall of the plug (46); one end of the hinge rod (53) is hinged to the middle slide (48) through a pin fixed in the hinge groove (52); the other end is hinged to the locking plug (46) through the locking hinge seat (47); the hinge point of the hinge rod (53) and the middle slide (48) is located on the lower inner side of the hinge point of the hinge rod (53) and the locking plug (46).

7. The lunch box body injection mold according to claim 6, characterized in that: A middle slide column (50) is provided on the end surface of the middle slide table (48) away from the through hole (43), and a push-table spring (51) is sleeved on the middle slide column (50). One end of the push-table spring (51) abuts against the middle slide table (48), and the other end abuts against the bottom wall of the inner cavity (42).

8. The lunch box body injection mold according to claim 6, characterized in that: A fixing column (38) is provided on the top surface of the connecting seat (37), and a movable guide hole (39) extending into the connecting seat (37) is opened on the top surface of the fixing column (38). The bottom of the outer body (41) is inserted into the movable guide hole (39) that slides with the fixing column (38). A plurality of linked hinge seats (57) are provided on the outer side wall of the outer body (41). A hinge base (54) is provided on the top surface of the connecting seat (37), and a centering clamp (55) is hinged on the hinge base (54). The centering clamp (55) is hinged on a linking frame (58), and the end of the linking frame (58) away from the centering clamp (55) is hinged to the outer body (41) through the linking hinge seat (57).

9. The lunch box body injection mold according to claim 8, characterized in that: A pusher spring (60) is provided in the movable guide hole (39), one end of the pusher spring (60) abuts against the bottom surface of the outer body (41), and the other end abuts against the bottom wall of the movable guide hole (39).

10. The lunch box body injection mold according to claim 1, characterized in that: An upper ejector hole (65) is provided on the top surface of the demoulding insert (29), a lower ejector hole (66) aligned with the upper ejector hole (65) is provided on the bottom wall of the core hole (22), an ejector cylinder (67) passing through the lower ejector hole (66) and the upper ejector hole (65) in sequence is provided on the top surface of the connecting seat (37), an ejector guide hole (68), a piston cavity (69), and an oil cavity (70) are provided downwardly on the top surface of the ejector cylinder (67), an ejector rod (71) is slidably provided in the ejector guide hole (68), and a forming head ( 72), a piston plate (73) that slides with the piston chamber (69) is provided at the bottom of the ejector rod (71), a return spring (74) is sleeved on the ejector rod (71), the upper end of the return spring (74) abuts against the top wall of the piston chamber (69), and the lower end of the return spring (74) abuts against the top surface of the piston plate (73), an oil filling pipe (77) is provided on the outer wall of the ejector cylinder (67), and the oil filling pipe (77) is connected to a hydraulic device, which is used to inject oil into the oil chamber (70) to push the piston plate (73), the ejector rod (71) and the forming head (72) upward.

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