A quick interchange mechanism for injection molds

Abstract

This application relates to the field of injection molds, and more particularly to a quick-change mechanism for injection molds, comprising: a main core block disposed on a mold core plate, the outer surface of the main core block being shaped to the same part as a workpiece, and a groove formed on the main core block corresponding to a different part of workpiece one; a movable core block, the outer surface of which is shaped to the different part of workpiece two, and the movable core block being movably disposed within the groove along the mold closing direction; after the movable core block slides into the protruding groove, it can fit against the part of the movable core block corresponding to the mold cavity surface; after the movable core block slides into the groove, it can form an injection space for the different part of workpiece two with the part of the movable core block corresponding to the mold cavity surface. This application has the effect of improving the core-changing speed of the mold, thereby improving operational efficiency.

Description

Technical Field

[0001] This application relates to the field of injection molds, and more particularly to a quick-change mechanism for injection molds. Background Technology

[0002] Injection molds are tools used to produce plastic products. Injection molds mainly consist of a frame system, within which a front mold core plate and a rear mold core plate are installed. The front mold core plate and the rear mold core plate can move relative to each other, and after the front mold core plate and the rear mold core plate are combined, they form a mold cavity for injection molding of workpieces.

[0003] The shape and size of the injection mold cavity are usually the same as the shape and size of the workpiece to be injection molded, in order to ensure the structural accuracy of the final injection molded product. Therefore, if the product structure changes, the mold needs to be replaced to complete the injection molding of the new product. However, for products where only part of the structure changes, a core-changing method can be used. This involves creating replaceable cores for the structurally different parts of the product. During injection molding, the core corresponding to the desired product structure is selected and installed to complete the injection molding of the workpiece.

[0004] Reference Figure 1 The relevant solutions involve the following two types of workpieces:

[0005] The workpiece includes an outer shell 01, a recess 02 is formed on one side of the outer shell 01, and a through groove 03 is formed on the bottom surface of the recess 02.

[0006] The second workpiece includes an outer shell 01, a recess 02 is formed on one side of the outer shell 01, and a wing plate 04 is formed protruding from the bottom surface of the recess 02.

[0007] The similarities between workpiece one and workpiece two are as follows:

[0008] The outer shell 01 has a recessed portion 02 formed on one side of the outer shell 01.

[0009] The difference between workpiece one and workpiece two lies in:

[0010] The bottom surface of the recessed part 02 of workpiece 2 is partially closed and protruded with a wing plate 04 corresponding to the through groove 03 of product 1.

[0011] When performing injection molding of workpiece one and workpiece two, it is necessary to switch the mold core. The core replacement operation is mainly done manually, that is, the operator uses tools to manually disassemble the mold core and then install a different mold core. The overall core replacement operation is cumbersome, time-consuming and affects the work efficiency. Summary of the Invention

[0012] To improve the core-changing speed of molds and thus increase operational efficiency, this application provides a quick-change mechanism for injection molds.

[0013] This application provides a quick interchange mechanism for injection molds, employing the following technical solution:

[0014] A quick-change mechanism for injection molds, comprising:

[0015] The main core block is set on any mold core plate. The outer surface of the main core block is formed to the same shape as the workpiece. The main core block is formed with a receiving groove corresponding to a different part of the workpiece.

[0016] The movable core block has an outer surface shaped to resemble the different part of workpiece two. The movable core block is movably positioned in the receiving groove along the mold closing direction.

[0017] After the movable core block slides into the protruding receiving groove, it can fit with the part of the movable core block corresponding to the mold cavity surface; after the movable core block slides into the receiving groove, it can form the injection space of the two different parts of the workpiece with the part of the movable core block corresponding to the mold cavity surface.

[0018] By adopting the above technical solution, when workpiece one needs to be injection molded, the sliding movable core block protrudes from the receiving groove and abuts against the mold cavity surface. During injection, the injection molding liquid will not flow into the part of the mold cavity that is in contact with the movable core block. In this way, the injection-molded product will have a through groove formed in the part of the movable core block, which is the different part shape of workpiece one. When workpiece two needs to be injection molded, the sliding movable core block returns to its original position, forming an injection space between the movable core block and the mold cavity surface. During injection, the injection molding liquid can flow into the injection space. In this way, the injection-molded product will have the injection space shape formed in the part of the movable core block, which is the different part shape of workpiece two. Thus, by moving the movable core block, the injection molding operations of workpiece one and workpiece two can be quickly switched, improving the core changing speed of the mold and thus improving the operation efficiency.

[0019] Optional, also includes:

[0020] The pusher slides along the mold closing direction within the mold frame system, with one end of the pusher penetrating the main core block and fixed to the movable core block on the side opposite to its outer surface.

[0021] The first spring has its two ends abutting against the mold frame system and the pusher respectively, and is used to drive the pusher to move away from the main core block until the movable core block is reset;

[0022] The pusher assembly, a frame system fixed to the mold, is used to drive the pusher component to move towards the main core block.

[0023] By adopting the above technical solution, during operation, the pushing component drives the pushing member to move and squeeze the spring, which enables the pushing member to drive the movable core block to protrude synchronously out of the receiving groove; when the pushing component resets, the first spring will also drive the pushing member to reset, so as to drive the movable core block to reset in the receiving groove.

[0024] Optional, the driving components include:

[0025] The push block is movably disposed in the mold frame system along the mold closing direction perpendicular to the mold. One end of the push block is formed with a pushing slope. The push block slides so that the pushing slope abuts against the end of the push member away from the main core block and pushes the main core block to move to the surface of the mold cavity.

[0026] The drive component is a frame system fixed to the mold, used to drive the pusher block to move.

[0027] By adopting the above technical solution, the driving component drives the pusher block to slide, and the pusher block can move towards the main core block by pushing the inclined surface against the end of the pusher block away from the main core block, so as to realize that the movable core block protrudes out of the receiving groove. Conversely, when the pusher block moves in the opposite direction, the first spring can also push the pusher block to slide in the opposite direction along the pushing inclined surface until the movable core block is reset.

[0028] Optionally, the pusher block and the pusher have a push plane on their adjacent surfaces, and the push plane is in contact with the push inclined surface;

[0029] After the pusher contacts the pusher plane, the pusher drives the movable core block to protrude out of the receiving groove and contact the inner surface of the mold cavity.

[0030] By adopting the above technical solution, when it is necessary to form workpiece one, the pusher moves horizontally until the pusher contacts the pusher's pusher slope. The pusher will then drive the movable core block to contact the inner surface of the mold cavity. Since the movement direction of the pusher is perpendicular to the movement direction of the pusher, the stability of the movable core block in the mold cavity can be guaranteed when the pusher contacts the pusher's pusher plane.

[0031] Optionally, the pusher includes:

[0032] The first push rod is arranged along the direction of movement of the pushing component, and one end of the first push rod is fixed to the movable core block;

[0033] The top column is coaxially fixed to the end of the first push rod away from the movable core block, and is used to abut against the push block;

[0034] Cooling channels are formed inside the first push rod and are arranged along the axial direction of the first push rod for heat exchange of the movable core block;

[0035] The fluid exchange channel is formed inside the top column and communicates with the cooling channel for the entry and exit of coolant.

[0036] By adopting the above technical solution, after the workpiece injection molding is completed, the coolant can flow through the fluid exchange channel. After the coolant enters the fluid exchange channel, it can flow into the cooling channel of the first push rod. Then, through the flow of the coolant, the heat of the moving core block can be carried away, so as to facilitate the cooling and demolding of the injection molded part.

[0037] Optionally, a guide pipe is fixed inside the cooling channel along its axial direction, and a cooling cavity one is formed between the outer peripheral wall of the guide pipe and the cooling channel, and a cooling cavity two communicating with the cooling cavity one is formed inside the guide pipe.

[0038] By adopting the above technical solution, after the coolant enters from one end of the coolant exchange channel, the coolant can flow between cooling chamber one and cooling chamber two and flow out from the other end of the coolant exchange channel, thereby carrying away the heat of the moving core block through the coolant, so as to facilitate the molding of the injection molded part.

[0039] Optionally, the drive components include:

[0040] The pull shaft is fixed at one end of the push block in the direction of movement;

[0041] The first drive cylinder is fixed to the frame system of the mold. The telescopic rod of the first drive cylinder is fixed to the pull shaft and is used to drive the pull shaft to move.

[0042] By adopting the above technical solution, during operation, the first drive cylinder drives the pull shaft to move, which can realize the movement of the push block and the switching of the position of the movable core block.

[0043] Optional, also includes:

[0044] The limiting block, a frame system fixed to the mold, is located on the side of the push block away from the driving component and is used to limit the extreme position of one end of the push block's movement direction.

[0045] A pull rod is provided along the axial direction of the pull shaft, and one end of the pull rod is fixed to the pull shaft;

[0046] Two abutting inclined surfaces are set on opposite sides of the tie rod, and the two abutting inclined surfaces are parallel to each other;

[0047] Two second drive cylinders are symmetrically fixed to the frame system of the mold, and the axial direction of the second drive cylinder is perpendicular to the axial direction of the first drive cylinder.

[0048] The telescopic rods of the two second drive cylinders extend to their limit positions, where they can abut against the two abutting inclined surfaces, and cause the pull rods to drive the push block to move through the pull shaft to the limit position where the push block moves away from the direction of the limit block.

[0049] By adopting the above technical solution, on the one hand, the extreme positions at both ends of the push block's movement direction can be restricted to achieve the stability of the push block's movement; on the other hand, when the push block moves away from the limit block, the action of the two second drive cylinders can further assist the push block's movement.

[0050] Optionally, the main core block is movably disposed on the mold core plate along the mold closing direction;

[0051] A second push rod is fixed on the side of the main core block that is away from its outer surface.

[0052] By adopting the above technical solution, after the workpiece is formed, the main core block moves to protrude from the mold plate, which can eject the injection-molded workpiece from the mold plate, so as to facilitate the demolding of the injection-molded part.

[0053] Optionally, the first push rod includes:

[0054] The sliding rod is fixed to the top column;

[0055] A sleeve rod is fixed to the movable core block, and the sleeve rod is sealed and fitted on the outside of the slide rod.

[0056] Two grooves are respectively provided on the slide rod and the sleeve rod, and the relative sliding of the sleeve rod and the slide rod can make the grooves connect;

[0057] The limiting post is movably set within the two receiving slots;

[0058] The first spring is disposed in the groove and is used to push the limiting post to slide between the two grooves to limit the relative movement of the sleeve rod and the sliding rod.

[0059] The main core block is also provided with:

[0060] The connecting rod slides within the main core block along a direction perpendicular to the movement of the main core block, and is provided with two grooves corresponding to the first push rod;

[0061] The swing plate is hinged at one end to the main core block, and its other end abuts against the connecting rod;

[0062] The third spring is fixed between the main core block and the connecting rod, and is used to push the connecting rod to swing the plate to an inclined state and to disengage the first push rod from the two grooves.

[0063] As the main core block moves away from the mold core plate, the mold core plate can push the swing plate to press the connecting rod into the two grooves, thereby causing the limiting post to retract into the groove of the slide rod, so that the sleeve rod can slide relative to the slide rod.

[0064] By adopting the above technical solution, during the demolding operation, as the main core block protrudes from the mold core plate, the slider slides along the guide groove, presses against the swing plate, and pushes the connecting rod, thereby inserting the connecting rod into the groove of the sleeve rod and pressing against the limiting post. When the limiting post disengages from the groove of the sleeve rod, the sleeve rod can move synchronously with the main core block, so that the movable core block moves synchronously with the main core block, ensuring the demolding of the workpiece. After the workpiece is ejected, when the main core block returns to its initial position, the second spring pushes the connecting rod to move out of the groove, pushes the swing plate to return to its original position, and at the same time, the grooves of the sleeve rod and the slide rod will correspond to each other. After the connecting rod exits the groove of the sleeve rod, the limiting post is pushed by the first spring to re-insert between the grooves of the two slide rods and the sleeve rod, maintaining the connection between the sleeve rod and the slide rod, restricting the relative movement of the sleeve rod and the slide rod, and enabling the first push rod to drive the movable core block to move synchronously again.

[0065] In summary, this application includes at least one of the following beneficial technical effects:

[0066] 1. When workpiece one needs to be injection molded, the sliding movable core block protrudes from the receiving groove and abuts against the mold cavity surface. During injection, the injection molding liquid will not flow into the part of the mold cavity that is in contact with the movable core block. In this way, the injection-molded product will have a through groove formed in the part of the movable core block, which is the different part shape of workpiece one. When workpiece two needs to be injection molded, the sliding movable core block returns to its original position, forming an injection space between the movable core block and the mold cavity surface. During injection, the injection molding liquid can flow into the injection space. In this way, the injection-molded product will have the injection space shape formed in the part of the movable core block, which is the different part shape of workpiece two. Thus, by moving the movable core block, the injection operation of workpiece one and workpiece two can be quickly switched, improving the core changing speed of the mold and thus improving the operation efficiency.

[0067] 2. After the workpiece injection molding is completed, the coolant can flow through the coolant exchange channel. After entering the coolant exchange channel, the coolant can flow into the cooling chamber of the first push rod. Then, through the flow of the coolant, the heat of the moving core block can be carried away, so as to facilitate the cooling and demolding of the injection molded part. Attached Figure Description

[0068] Figure 1 These are structural schematic diagrams of workpiece one and workpiece two related to the technology;

[0069] Figure 2 This is a schematic diagram of the structure of a quick-change mechanism for an injection mold according to an embodiment of this application;

[0070] Figure 3 This is a cross-sectional schematic diagram of a quick-change mechanism for an injection mold according to an embodiment of this application;

[0071] Figure 4This is a schematic diagram of the structure of the fixed guide seat of a quick-change mechanism for injection molds according to an embodiment of this application;

[0072] Figure 5 yes Figure 2 Enlarged diagram of section A in the middle;

[0073] Figure 6 This is a cross-sectional schematic diagram of the first push rod structure of a quick-change mechanism for an injection mold according to an embodiment of this application;

[0074] Figure 7 yes Figure 6 Enlarged diagram of section B in the middle;

[0075] Figure 8 yes Figure 6 Enlarged diagram of section C;

[0076] Figure 9 This is a schematic diagram of the second push rod structure of a quick-change mechanism for injection molds according to an embodiment of this application.

[0077] Figure 10 This is a cross-sectional schematic diagram of another main core block of a quick-change mechanism for an injection mold according to an embodiment of this application.

[0078] Figure 11 yes Figure 10 Enlarged schematic diagram of section D in the middle;

[0079] Figure 12 yes Figure 10 Enlarged schematic diagram of section E in the middle.

[0080] Explanation of reference numerals in the attached drawings: 01, outer shell; 02, recessed portion; 03, through groove; 04, wing plate; 1, main core block; 11, receiving groove; 12, straight guide groove; 121, straight guide block; 13, second push rod; 131, movable guide seat; 132, oblique guide groove; 133, oblique guide block; 14, sliding groove; 141, third spring; 142, connecting rod; 15, swing plate; 2, movable core block; 3, first push rod; 31, cooling channel; 311, cooling chamber one; 312, ... Cooling chamber two; 32, guide pipe; 321, notch; 33, slide bar; 34, sleeve rod; 35, trough; 351, second spring; 352, limiting post; 4, top post; 41, first spring; 42, fluid exchange channel; 5, fixed guide seat; 51, push block; 511, pushing plane; 512, pushing inclined plane; 52, pull shaft; 53, first drive cylinder; 54, limiting block; 55, pull rod; 551, slider; 552, contacting inclined plane; 56, second drive cylinder. Detailed Implementation

[0081] The following is a detailed description of a quick-change mechanism for injection molds according to this application.

[0082] Reference Figure 2 and Figure 3 A quick-change mechanism for injection molds mainly includes a main core block 1 and a movable core block 2.

[0083] The main core block 1 is disposed on the inner side of a mold core plate. In this embodiment, the rear mold core plate is used as an example. The outer surface shape of the main core block 1 is the same as the shape of the same part of the two workpieces. The main core block 1 is formed with a receiving groove 11 corresponding to the groove of the workpiece. The opening direction of the receiving groove 11 is set along the mold closing direction. The movable core block 2 is placed in the receiving groove 11, and the outer surface shape of the movable core block 2 is the same as the shape of the different part of the two workpieces.

[0084] The portion of the inner surface of the mold cavity corresponding to the main core block 1 and the movable core block 2 is formed into the shape of workpiece two. When the movable core block 2 protrudes from the receiving groove 11, the outer surface of the movable core block 2 fits into the corresponding portion of the inner surface of the mold cavity. At this time, the shape of the mold cavity in the front and rear mold plates is the shape of workpiece one, which can realize the injection molding of workpiece one. When the movable core block 2 is reset and moved into the receiving groove 11, the outer surface of the movable core block 2 and the inner surface of the mold cavity respectively form injection spaces. At this time, the shape of the mold cavity in the front and rear mold plates is the shape of workpiece two, which can realize the injection molding of workpiece two.

[0085] A first push rod 3 is provided on the side of the movable core block 2 away from its outer surface. The axis of the first push rod 3 is set along the mold closing direction, and the first push rod 3 can slide on the frame system of the mold. One end of the first push rod 3 in the length direction passes through the mold core plate and is fixed to the movable core block 2. In order to facilitate the sliding guidance of the first push rod 3 and the frame system of the mold, a sliding sleeve can be provided on the sliding part of the first push rod 3 and the frame system of the mold. By fixing the sliding sleeve to the frame system of the mold and making the sliding sleeve slide and fit on the first push rod 3, the stability of the sliding of the first push rod 3 can be guaranteed.

[0086] The first push rod 3 has a top post 4 coaxially fixed at one end away from the movable core block 2. The top post 4 and the slide rod 33 work together to form a pushing component. A first spring 41 is also sleeved on the slide rod 33. One end of the first spring 41 abuts against the mold frame system, or indirectly abuts against the mold frame system through the slide sleeve. The other end of the first spring 41 abuts against the top post 4. Under normal conditions, the first spring 41 can push the top post 4 to move away from the movable core block 2, so that the pushing component as a whole pushes the movable core block 2 to abut against the bottom surface of the receiving groove 11 on the main core block 1, preventing the movable core block 2 from protruding out of the receiving groove 11, thereby facilitating the injection molding of the second workpiece.

[0087] The quick-change mechanism also includes a pushing component, which is disposed in the mold frame system. The pushing component includes a fixed guide seat 5 fixed to the mold frame system. A push block 51 slides within the fixed guide seat 5 along the mold closing direction perpendicular to the mold. The push block 51 has a generally rectangular block structure. The side of the push block 51 opposite to the guide seat is a pushing plane 511, and the end of the push block 51 corresponding to the pushing plane 511 has an inclined notch to form a pushing slope 512.

[0088] Refer to 2 and Figure 3 The pusher post 4, under the action of the first spring 41, can abut against the pusher block 51's pusher plane 511 or pusher ramp 512 (see reference). Figure 4 When a mold is needed to inject workpiece one, the pusher block 51 slides along the guide seat until the top post 4 abuts against the pushing plane 511 of the pusher block 51. At this time, the pusher block 51 will push the top post 4 to compress the first spring 41, so that the movable core block 2 will be pushed out of the groove 35 of the main core block 1 through the first push rod 3, thereby sealing the part of the movable core block 2 in the mold cavity, so that the injection liquid cannot flow through, so that after the workpiece is injection molded, the through groove 03 is formed in the part of the movable core block 2, thus completing the injection molding of workpiece one; when a mold is needed to inject workpiece two... During molding, the push block 51 slides along the fixed guide seat 5 until the top post 4 abuts against the push inclined surface 512. At this time, the first spring 41 will push the top post 4 to move away from the main core block 1, so that the movable core block 2 can be pulled by the first push rod 3 to reset in the groove 35 of the main core block 1. At this time, the part corresponding to the movable core block 2 in the mold cavity will form an injection space to facilitate the filling of the injection liquid. After the workpiece is injection molded, the part corresponding to the movable core block 2 can form the structure of the different part of the workpiece 2, thereby completing the injection molding of the workpiece 2.

[0089] Reference Figure 2 Furthermore, a drive mechanism is provided on one side of the push block 51 to drive the movement of the push block 51.

[0090] Reference Figure 2 and Figure 4 The drive mechanism is fixed to the mold frame system and includes a first drive cylinder 53, which is arranged along the movement direction of the push block 51. A pull shaft 52 is fixed to one end of the push block 51 opposite to its pushing inclined surface 512, and the pull shaft 52 is arranged along the movement direction of the push block 51. The telescopic rod of the first drive cylinder 53 is fixed to the pull shaft 52. Thus, the extension and retraction of the telescopic rod of the first drive cylinder 53 drives the push block 51 to reciprocate via the pull shaft 52.

[0091] Reference Figure 4 Furthermore, a limit block 54 is fixed at one end of the fixed guide seat 5 away from the first drive cylinder 53 to limit the extreme position of one end of the sliding direction of the push block 51 and prevent the push block 51 from disengaging from the guide seat.

[0092] Reference Figure 5 A pull rod 55 is also provided above the pull shaft 52 along its axial direction. One end of the pull rod 55 is fixed to the pull shaft 52, and the other end of the pull rod 55 extends above the first drive cylinder 53. Second drive cylinders 56 are symmetrically arranged on both sides of the pull rod 55 opposite to the pull shaft 52. The telescopic rods of the two second drive cylinders 56 are perpendicular to the pull rod 55. A slider 551 is provided on the side of the pull rod 55 opposite to the two second drive cylinders 56. The two sliders 551 are arranged back and forth along the axial direction of the pull rod 55, and the close portions of the two sliders 551 overlap in projection. A contacting inclined surface 552 is provided at one end of the overlapping portion of the two sliders 551, and the two contacting inclined surfaces 552 are parallel to each other. Rollers are rotatably mounted on the telescopic rods of the two second drive cylinders 56. The rollers contact the contacting inclined surfaces 552 and can roll along the contacting inclined surfaces 552.

[0093] As the telescopic rods of the two second drive cylinders 56 extend, they can cooperate with the push inclined plane to push the slider 551 to move along the axis of the pull rod 55. Thus, the pull rod 55 can drive the pull shaft 52 to move, thereby assisting the first drive cylinder 53 in dragging the push block 51.

[0094] Furthermore, since the two contacting inclined surfaces 552 are parallel to each other and are located in the overlapping part of the projection of the two sliders 551, when the telescopic rods of the two second drive cylinders 56 extend to the limit position, that is, when they simultaneously contact the low point of the two contacting inclined surfaces 552, they can also limit the relative position of the two sliders 551 and the two second drive cylinders 56, that is, limit the pull rod 55 from moving. Here, the limit position of the push block 51 tends to move away from the direction of the limit block 54.

[0095] Reference Figure 6 and Figure 7 Furthermore, a cooling channel 31 extending into the movable core block 2 is formed within the first push rod 3 along its axial direction. A guide tube 32 is provided within the cooling channel 31 along its extending direction. One end of the guide tube 32 is fixed to the first push rod 3, and a notch 321 is formed between the other end of the guide tube 32 and the end of the cooling channel 31 extending into the movable core block 2. The outer diameter of the guide tube 32 is smaller than the diameter of the cooling channel 31, so that a first cooling chamber 311 is formed between the outer wall of the guide tube 32 and the channel wall of the cooling channel 31, while a second cooling chamber 312 is formed inside the guide tube 32. The first cooling chamber 311 and the second cooling chamber 312 are interconnected through the notch 321.

[0096] Reference Figure 6 and Figure 8The top column 4 also has a fluid exchange channel 42 formed inside. Both ends of the fluid exchange channel 42 extend out of both sides of the top column 4 for connecting the coolant pipe. The middle part of the fluid exchange channel 42 is connected to the first cooling chamber 311 and the second cooling chamber 312, so that the coolant flows through the first cooling chamber 311 and the second cooling chamber 312 in sequence at one end of the fluid exchange channel 42 and then flows out from the other end of the fluid exchange channel 42, or the coolant flows through the second cooling chamber 312 and the first cooling chamber 311 in sequence at one end of the fluid exchange channel 42 and then flows out from the other end of the fluid exchange channel 42.

[0097] After the workpiece injection molding is completed, the coolant can be sent to the coolant exchange channel 42, so that the coolant flows to the cooling chamber 311 and the cooling chamber 312 of the first push rod 3 to remove the heat of the movable core block 2, so as to facilitate the cooling and demolding of the injection molded part.

[0098] Reference Figure 9 Furthermore, the main core block 1 is movably disposed on the mold core plate along the mold closing direction. Specifically, a straight guide groove 12 is formed on one side of the main core block 1 along its moving direction. The mold frame system is provided with a straight guide block 121, which slides in the straight guide groove 12 to guide the main core block 1.

[0099] A second push rod 13 is fixed on the side of the main core block 1 away from its outer surface. The second push rod 13 is slidably connected to the mold frame system. The mold frame system is also provided with a second push rod 13 drive assembly for pushing the second push rod 13 to slide so that the main core block 1 protrudes or retracts into the mold core plate.

[0100] Specifically, the second push rod 13 drive assembly includes a movable guide seat 131, which slides along the mold closing direction perpendicular to the mold frame system. The mold frame system is also provided with a pull hook for cooperating with the movable guide seat 131 to realize the movement of the movable guide seat 131.

[0101] The movable guide seat 131 has an inclined guide groove 132 at an angle. The inclined guide groove 132 is inclined in the mold closing direction. The end of the second push rod 13 away from the main core block 1 is fixed with an inclined guide block 133. The inclined guide block 133 slides in the inclined guide groove 132 and can be dragged to move with the sliding of the movable guide seat 131, so as to drive the main core block 1 to move through the second push rod 13. At the same time, because the first spring 41 is set on the first push rod 3, when the movable core block 2 moves synchronously with the main core block 1, the first spring 41 can be compressed so that the movable core block 2 can move a certain distance away from the mold plate synchronously with the main core block 1, so as to realize the ejection of the injection molded part, ensure the smooth movement of the main core block 1, and avoid the movable core block 2 from hindering the movement of the main core block 1.

[0102] In another proposed solution, when the required movement distance of the main core block 1 is too large and the compression deformation of the first spring 41 is insufficient to meet the movement distance of the main core block 1, the following solution can also be adopted:

[0103] Reference Figure 10 and Figure 11 The first push rod 3 includes a sliding rod 33 and a sleeve rod 34 coaxially arranged. The sleeve rod 34 is fixed to the movable core block 2, and the sliding rod 33 is fixed to the top column 4. The sleeve rod 34 is sealed and fitted onto the sliding rod 33. A receiving groove 35 is provided at a position corresponding to the peripheral wall of the sleeve and the peripheral wall of the sliding rod 33. The receiving groove 35 penetrates the peripheral wall of the sleeve and extends into the peripheral wall of the sliding rod 33. A second spring 351 and a limiting post 352 are provided in the receiving groove 35. The second spring 351 is fixed between the receiving groove 35 and the limiting post 352. Under normal conditions, the second spring 351 pushes the limiting post 352 to a position in the receiving groove 35 between the sliding rod 33 and the sleeve rod 34, thereby limiting the relative movement of the sliding rod 33 and the sleeve rod 34 and ensuring the normal operation of the first push rod 3.

[0104] Reference Figure 10 and Figure 11 The main core block 1 also has a sliding groove 14 formed in the mold opening direction perpendicular to the mold. When the movable core block 2 retracts and resets into the receiving groove 11 of the main core block 1, the sliding groove 14 is correspondingly set with the receiving groove 35. A third spring 141 and a connecting rod 142 are set in the sliding groove 14 (see reference). Figure 12 The third spring 141 is fixed between the slide groove 14 and the connecting rod 142. Under normal conditions, the third spring 141 can keep the connecting rod 142 from being inserted into the receiving groove 35. A swing plate 15 is also provided in the straight guide groove 12 of the main core block 1. The upper end of the swing plate 15 is hinged to the main core block 1, and the lower end of the swing plate 15 is a free end. The end of the connecting rod 142 away from the receiving groove 35 extends into the straight guide groove 12 and abuts against the lower side of the swing plate 15. Under normal conditions, the third spring 141 will also keep the connecting rod 142 pushing the lower end of the swing plate 15 in an inclined state. As the main core block 1 moves away from the mold core plate, the straight guide block 121 fixed to the mold core plate slides along the straight guide groove 12 and comes into contact with the swing plate 15, thereby swinging the swing plate 15 so that the connecting rod 142 is inserted into the receiving groove 35 until the limiting post 352 is pushed back into the receiving groove 35 of the slide rod 33, so that the sleeve rod 34 can slide relative to the slide rod 33.

[0105] In summary, during the demolding process, as the main core block 1 protrudes from the mold core plate, the straight guide block 121 slides along the straight guide groove 12, pressing against the swing plate 15. This pushes the connecting rod 142, causing it to insert into the groove 35 of the sleeve rod 34 and press against the limiting post 352. This allows the limiting post 352 to disengage from the groove 35 of the sleeve rod 34. At this time, the sleeve rod 34 can move synchronously with the main core block 1, ensuring that the movable core block 2 moves synchronously with the main core block 1 and guaranteeing the demolding of the workpiece. After the workpiece is ejected, the main core block 1 returns to its initial position. In the initial position, the second spring 351 pushes the connecting rod 142 out of the groove 35, and the connecting rod 142 pushes the swing plate 15 to reset. At the same time, the grooves 35 of the sleeve rod 34 and the slide rod 33 will correspond to each other. After the connecting rod 142 exits the groove 35 of the sleeve rod 34, the limiting post 352 is pushed by the first spring 41 and re-inserted between the grooves 35 of the two slide rods 33 and the sleeve rod 34, maintaining the connection between the sleeve rod 34 and the slide rod 33, and restricting the relative movement of the sleeve rod 34 and the slide rod 33. This allows the first push rod 3 to drive the movable core block 2 to move synchronously again.

[0106] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rapid change mechanism for injection molds, characterized in that, It includes: The main core block (1) is arranged on the mold plate, the outer surface of the main core block (1) is shaped as the same part of the workpiece, and the main core block (1) is shaped with a containing groove (11) corresponding to the different part of the workpiece; The movable core block (2) is shaped as the different part of the workpiece, and the movable core block (2) is arranged in the containing groove (11) along the closing direction of the mold; After the movable core block (2) slides out of the containing groove (11), it can be attached to the part of the mold cavity surface corresponding to the movable core block (2); After the movable core block (2) slides into the containing groove (11), it can form an injection molding space of the different part of the workpiece with the part of the mold cavity surface corresponding to the movable core block (2); The pusher slides in the frame system of the mold along the closing direction of the mold, one end of the pusher is arranged in the main core block (1) and is fixed to the side of the movable core block (2) away from the outer surface thereof; The first spring (41) is arranged at two ends of the frame system of the mold and the pusher respectively, and is used for driving the pusher to move away from the main core block (1) to reset the movable core block (2); The pusher assembly is fixed to the frame system of the mold, and is used for driving the pusher to move in the direction of the main core block; The pusher includes: a first push rod (3) arranged along the moving direction of the pusher assembly, one end of the first push rod (3) is fixed to the movable core block (2); A top column (4) coaxially fixed to one end of the first push rod (3) away from the movable core block (2), used for abutting the push block (51); A cooling channel (31) formed in the first push rod (3) is arranged along the axis direction of the first push rod (3), used for heat exchange of the movable core block (2); A liquid exchange channel (42) formed in the top column (4) is in communication with the cooling channel (31), used for cooling liquid in and out; The first push rod (3) comprises: a sliding rod (33) fixed to the top column (4); a sleeve rod (34) fixed to the movable core block (2), the sleeve rod (34) being sealingly sleeved outside the sliding rod (33); two containing grooves (35) respectively formed in the sliding rod (33) and the sleeve rod (34), the sleeve rod (34) being capable of sliding relative to the sliding rod (33) to communicate the containing grooves (35); a limiting column (352) movably arranged in the two containing grooves (35); and a second spring (351) arranged in the containing groove (35) and used to push the limiting column (352) to slide between the two containing grooves (35) to limit the relative movement of the sleeve rod (34) and the sliding rod (33).

2. A quick change mechanism for injection molds as defined in claim 1, wherein: The pushing assembly comprises: a pushing block (51) movably arranged in a frame system of a mold along a direction perpendicular to a closing direction of the mold, one end of the pushing block (51) being formed with a pushing inclined surface (512), the pushing block (51) being capable of sliding to make the pushing inclined surface (512) abut against one end of the pushing member away from the main core block (1) and push the main core block (1) to move to abut against a surface of a mold cavity; and a driving component fixed to the frame system of the mold and used to drive the pushing block (51) to move.

3. A quick change mechanism for injection molds as defined in claim 2, wherein: The pushing block (51) and the adjacent surface of the pushing member are provided with a pushing surface (511), the pushing surface (511) being in abutment with the pushing inclined surface (512); after the pushing member abuts against the pushing surface (511), the pushing member drives the movable core block (2) to protrude from the containing groove (35) to abut against an inner surface of the mold cavity.

4. A quick change mechanism for injection molds as defined in claim 1, wherein: The first push rod (3) is formed with a cooling channel (31) extending to the movable core block (2) along an axial direction of the first push rod (3); the cooling channel (31) is fixed with a flow guide pipe (32) along an axial direction of the cooling channel (31), a cooling cavity one (311) being formed between the flow guide pipe (32) and the cooling channel (31), and a cooling cavity two (312) being formed in the flow guide pipe (32) and communicating with the cooling cavity one (311).

5. A quick change mechanism for an injection mold as defined in claim 2 wherein: The driving component comprises: a pulling shaft (52) fixed to one end of the movable direction of the push block (51); a first driving cylinder (53) fixed to the frame system of the mold, and a telescopic rod of the first driving cylinder (53) fixed to the pulling shaft (52) for driving the pulling shaft (52) to act.

6. A quick change mechanism for injection molds as defined in claim 5, wherein: Further comprising: a limiting block (54) fixed to the frame system of the mold and located on the side of the push block (51) away from the driving component for limiting the extreme position of one end of the moving direction of the push block (51); a pulling rod (55) arranged along the axis direction of the pulling shaft (52), one end of the pulling rod (55) fixed to the pulling shaft (52); two abutting inclined surfaces (552) arranged on the opposite sides of the pulling rod (55), the two abutting inclined surfaces (552) parallel to each other; two second driving cylinders (56) symmetrically fixed to the frame system of the mold, the axis direction of the second driving cylinder (56) perpendicular to the axis direction of the first driving cylinder (53); the telescopic rod of the two second driving cylinders (56) extended to the extreme position, capable of abutting on the two abutting inclined surfaces (552), and making the pulling rod (55) drive the push block (51) to move through the pulling shaft (52) to the extreme position of the moving direction of the push block (51) away from the limiting block (54).

7. A quick change mechanism for injection molds as defined in claim 1, wherein: The main core block (1) is movably arranged on the mold core plate along the closing direction of the mold; the second push rod (13) is fixed to the side of the main core block (1) away from the outer surface thereof.

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