Anti-retreating single-cavity double-color injection molding mold for automobile bottom guard plate

Abstract

The invention relates to an automobile bottom guard plate anti-retreating single-cavity double-color injection molding mold which comprises a movable mold plate and a fixed mold plate, the movable mold plate is provided with a first molding area used for molding a guard plate body and a second molding area used for molding a connecting cushion, the movable mold plate is provided with a first cavity communicated with the second molding area, and the fixed mold plate is provided with a second cavity communicated with the second molding area. A check block is slidably connected into the first cavity, a driving part used for driving the check block to slide is arranged on the movable mold plate, and the end of the check block extends into the second forming area and fills the second forming area. A check block is arranged on the movable mold plate, an insertion rod is connected to the check block in a sliding mode, a control mechanism used for controlling the insertion rod to slide is arranged on the check block, an insertion groove matched with the insertion rod in an inserted mode is formed in the movable mold plate, and the insertion rod is inserted into the insertion groove to limit sliding of the check block. According to the invention, single-cavity double-color product injection molding is realized.

Description

Technical Field

[0001] The invention relates to the field of molds, in particular to a single-cavity two-color injection molding mold for preventing the retreat of an automobile bottom guard plate. Background Art

[0002] A car bottom guard plate Figure 15 As shown, it includes a guard plate body 91, and the guard plate body 91 is injection molded by a mold. Connecting pads 92 and assembly holes 93 are provided on both sides of the guard plate body 91, and the two assembly holes 93 are respectively located above the two guard plate bodies 91. The guard plate body 91 and the connecting pads 92 are injection molded by two materials, so it is necessary to design a two-color mold to complete the production of the car bottom guard plate. Traditional two-color molds complete the production of products by designing a double-cavity structure, but the mold volume of the double-cavity structure is relatively large, more steel is required, and the production cost is high.

[0003] To control costs, the mold for producing the underbody guard plate is designed with a single cavity and dual molding zones, thereby controlling the mold volume and cost. The dual molding zones here refer to the molding zone for molding the underbody guard plate body 91 and the molding zone for molding the connecting cushion 92.

[0004] The guard plate body 91 is flat, so the molding area of ​​the mold for molding the guard plate body 91 is flat and narrow. To ensure that the guard plate body 91 is completely molded, the injection molding machine applies a high injection pressure when injecting hot melt plastic into the molding area for molding the guard plate body 91 to ensure that the hot melt plastic can fully fill the molding area for molding the guard plate body 91.

[0005] The extremely high injection pressure will also easily press the hot melt plastic into the molding area for molding the connection cushion 92. In order not to affect the injection molding of the connection cushion 92, a sealing structure needs to be designed on the mold to prevent the hot melt plastic from flowing into the molding area for molding the connection cushion 92 when the molding guard plate body 91 is injection molded. Summary of the Invention

[0006] The present application provides a single-cavity two-color injection molding die for preventing the retreat of automobile underbody guard plates, which realizes the injection molding of two-color products in a single cavity.

[0007] The present application provides a single-cavity, two-color injection molding die for preventing the underbody guard from retreating, which adopts the following technical solutions: A single-cavity, two-color injection molding die for preventing the underbody guard plate from retreating, comprising a movable die plate and a fixed die plate, the movable die plate being provided with a first molding area for molding the guard plate body and two second molding areas for molding connecting soft cushions, the first molding area being provided with two molding rods for molding assembly holes, the movable die plate being provided with a chamber connected to the second molding area, a block being slidably connected to the chamber one, the movable die plate being provided with a driving portion for driving the block to slide, the end of the block extending into and filling the second molding area; an insert rod being slidably connected to the block, the block being provided with a control mechanism for controlling the sliding of the insert rod, the movable die plate being provided with a slot for plugging and cooperating with the insert rod, the insert rod being inserted into the slot to limit the sliding of the block.

[0008] By adopting the above technical solution, after the mold is closed, the injection molding machine injects hot-melt plastic into the first molding area to complete the molding of the guard plate body. When the hot-melt plastic fills the first molding area, it will impact the block. Due to the limitation of the insert rod and the slot, the block will not retreat when impacted by the hot-melt plastic, which also prevents the hot-melt plastic from flowing into the second molding area, ensuring the injection molding of the connecting cushion. After the guard plate body is injection-molded, the control mechanism controls the insert rod to move out of the slot, thereby releasing the movement restriction of the block, and then the drive unit drives the block to move, so that the block moves out of the second molding area, so that the injection molding machine can inject the hot-melt plastic used to mold the connecting cushion into the second molding area, thereby completing the injection molding of the connecting cushion.

[0009] Preferably, the movable template is provided with a plurality of avoidance grooves connected to chamber one, and the fixed template is provided with a plurality of limit blocks, which pass through the plurality of avoidance grooves and extend into chamber one; the limit blocks are located on the movement path of the block moving away from the second molding area, and when the block moves to conflict with the limit block, the end of the block just moves out of the second molding area.

[0010] By adopting the above technical solution, when the injection molding machine injects hot-melt plastic into the second molding zone, the limit block prevents the block from retreating, thereby preventing quality issues such as uneven injection time of the connecting cushion and flash. After the connecting cushion is injection-molded, the mold is opened, the limit block moves out of chamber one, and the drive unit drives the block away from the already-molded connecting cushion, thereby releasing the adhesion between the connecting cushion and the block, and reducing the probability of the connecting cushion being pulled up with the guard plate body when it is demolded.

[0011] Preferably, a push block is slidably connected to the movable template, and the bottom area of ​​the second molding area is opened on the push block; a spring 1 is provided in the movable template, and the elastic force of the spring 1 acts on the push block, and the spring 1 always drives the push block to move toward the stop block so that the push block always conflicts with the stop block; when the mold is in the closed state, the stop block presses the push block to limit the movement of the push block; when the stop block moves into the chamber 1, the stop block cancels the restriction on the movement of the push block, and the spring 1 pushes the push block to move into the chamber 1.

[0012] By adopting this technical solution, as the stopper moves away from the connecting cushion, it no longer presses against the pusher block. Spring 1 rebounds, driving the pusher block toward chamber 1. This movement pushes the connecting cushion toward chamber 1, causing it to bend and deform, thereby releasing the connection cushion from the second molding area. After the product is subsequently demolded, the drive unit drives the stopper back into position. This movement pushes the pusher block back into position, compressing spring 1.

[0013] Preferably, an insert is provided on the movable template, the spring is provided in the insert, the push block is slidably connected to the insert, and the second molding area is composed of the insert and the push block.

[0014] By adopting the above technical solution, the processing of the second forming area is facilitated, and the installation of the spring and the push block is also facilitated.

[0015] Preferably, two mounting cavities are provided on the movable template, and the two mounting cavities are connected to two different avoidance grooves. The forming rod is slidably connected in the mounting cavity, and a matching block is provided on the forming rod. The matching block is slidably connected in the mounting cavity. A return spring is provided in the mounting cavity, and the return spring is sleeved on the forming rod and contacts the matching block. A stop block is provided at one end of the forming rod away from the first forming area, and the stop block extends into the mounting cavity. A slope is provided on the end of the stop block facing the fixed template. When the mold is closed, the limit block presses against the slope to drive the stop block to move into the mounting cavity, so that the end of the forming rod extends into the first forming area to meet the forming of the assembly hole.

[0016] By adopting this technical solution, when the mold is closed, the limit block presses against the inclined surface, driving the stop block, forming rod, and mating block to move. This movement of the mating block presses against the return spring, causing the forming rod to extend into the first molding area, thereby forming the assembly hole. After the underbody guard is injection molded, the mold is opened, the limit block moves out of the limit slot, and the spring rebounds, driving the stop block, forming rod, and mating block toward the avoidance slot, allowing the forming rod to move out of the assembly slot, releasing the undercut structure between the forming rod and the assembly slot, and ensuring smooth demolding of the underbody guard.

[0017] Preferably, the block includes a block 1 and a block 2 which are connected to each other, the block 1 extends into and fills the second forming area, the block 2 is connected to the driving part, the block 1 is provided with a dovetail block 1, the block 2 is provided with a dovetail groove 1, the dovetail block 1 is slidably connected in the dovetail groove 1; the insertion rod is slidably connected to the block 2.

[0018] By adopting the above technical solution, the positions of the driving part and other components are adjusted so that the driving part and other components can be reasonably installed on the movable template, avoiding interference between the driving part and other components and the installation of other components on the movable template.

[0019] Preferably, the control mechanism includes chamber 2 and chamber 3 provided on block 2, a slider provided on the insertion rod and slidably connected to chamber 2, a spring 2 provided in chamber 2 and in contact with the slider, and a control block slidably connected to chamber 3, and the control block is connected to the driving part; a dovetail groove 2 is provided on the control block, the insertion rod passes through chamber 2 and extends into chamber 3, and a dovetail block 2 is provided on the end of the insertion rod extending into chamber 3, and the dovetail block 2 is slidably connected to the dovetail groove 2; when the control block moves away from the second molding area, it drives the insertion rod to move into block 2 by pressing the dovetail block 2, and the slider slides with the insertion rod and presses the spring 2; when the control block moves close to the second molding area, it does not drive the dovetail block 2 to move, and at the same time, a space for the dovetail block 2 to move and reset is formed in the dovetail groove 2.

[0020] By adopting the above technical solution, after the guard plate body is injection molded, the driving unit drives the control block to slide in chamber three, so that the control block moves away from the second molding area. During this process, the control block will press against the dovetail block two to make the rod move into block two, so as to release the plug-in fit between the rod and the slot. In the process of the rod entering block two, the rod will slide in chamber two with the slider, and the slider two will press against the spring two, so that the spring two is compressed. Subsequently, the control block will move to conflict with the cavity wall of chamber three, and at this time the rod will also move into block two. The control block will continue to move away from the second molding area, thereby pushing block two to move away from the second molding area. When block two moves away from the second molding area, it will drive block one to move away from the second molding area, so that the second molding area can be used to form a connecting cushion. After the subsequent product is demolded, the drive unit pushes the control block to move closer to the second molding area. When the control block moves closer to the second molding area, space is formed in dovetail groove two for dovetail block two to move back to its original position. Spring two will rebound and drive the slider to move back to its original position a short distance, causing the insertion rod to collide with the side wall of chamber one. The control block then moves to collide with the cavity wall of chamber three near the second molding area and pushes block two to move back to its original position. Once block two moves back to its original position, the insertion rod will align with the slot, and spring two will continue to rebound and drive the slider to move back to its original position, causing the insertion rod to insert into the slot, thereby limiting the movement of block two. When the movement of block two is restricted, the movement of block one is also restricted. This helps block one withstand the impact of the hot melt plastic.

[0021] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention realizes double anti-retraction of block one through the cooperation between the slot and the insertion rod, and the cooperation between block two and the limit block, thereby ensuring high-quality injection molding of the connection cushion; 2. The present invention removes the restriction on the second retreat of the block 2 after the mold is opened, so that the block 2 can move away from the connecting cushion with the block 1, thereby releasing the adhesion between the block 1 and the connecting cushion.

[0022] 3. The present invention is provided with a push block and a spring 1, and the movement of the push block is controlled by the movement of the block 1, so that when the block 2 retreats for the second time, the push block can push the end of the connecting cushion to bend and deform, thereby releasing the adhesion between the connecting cushion and the second molding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the mold in the closed state.

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the fixed template and the movable template.

[0025] Figure 3 It is a structural diagram of the dynamic template.

[0026] Figure 4 It is a structural diagram of the insert.

[0027] Figure 5 yes Figure 2 Cross-sectional view of the fixed template and the movable template along line AA.

[0028] Figure 6 Schematic diagram of the structure of the stopper, plunger and control mechanism.

[0029] Figure 7 Schematic diagram of the local structure of the moving template when viewed from above.

[0030] Figure 8 yes Figure 7 Partial cross-sectional view of the center fixed template along line BB.

[0031] Figure 9 It is a schematic diagram of the mechanism of the plunger, slider, control block and drive unit.

[0032] Figure 10 It is a structural diagram of the fixed template.

[0033] Figure 11 yes Figure 5 A partial enlarged view of point C in the middle.

[0034] Figure 12 yes Figure 11 Schematic diagram of the structure when the middle block moves out of the second forming area.

[0035] Figure 13 yes Figure 11 Schematic diagram of the structure after the middle block 1 moves into the chamber 1 and the spring 1 drives the push block to move.

[0036] Figure 14 yes Figure 5 A partial enlarged view of point D in the middle.

[0037] Figure 15 It is a structural diagram of the car bottom guard plate.

[0038] Reference numerals: 1, movable platen; 11, first molding area; 12, second molding area; 13, chamber 1; 14, driving part; 15, avoidance groove; 16, push block; 17, spring 1; 18, insert; 19, slot; 2, fixed platen; 21, limit block; 3, stopper; 31, block 1; 32, block 2; 33, dovetail block 1; 34, dovetail groove 1; 4, insertion rod; 5, control mechanism; 51, chamber 2; 52 , chamber three; 53, slider; 54, spring two; 55, control block; 61, dovetail groove two; 62, dovetail block two; 71, upper fixed plate; 72, hot runner plate; 73, mold foot; 74, ejection mechanism; 75, lower fixed plate; 81, installation cavity; 82, forming rod; 83, matching block; 84, return spring; 85, stop block; 86, inclined surface; 91, guard plate body; 92, connecting cushion; 93, assembly hole;. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings to make the technical solution of this application easier to understand and grasp.

[0040] Reference Figure 1-Figure 4 In this embodiment, a single-cavity, two-shot injection molding mold for preventing the retreat of an automobile underbody guard plate comprises an upper fixed plate 71, a hot runner plate 72, a fixed plate 2, a movable plate 1, multiple mold feet 73, an ejector mechanism 74, and a lower fixed plate 75. The movable plate 1 defines a first molding area 11 for molding the guard plate body 91. Two inserts 18 are detachably connected to the movable plate 1, each of which defines a second molding area 12 for molding a connecting cushion 92. (The ejector mechanism 74 herein is a conventional ejector plate and ejector pin structure, as is common knowledge in the art.)

[0041] Reference Figure 2 In Figure 6, the movable platen 1 has two chambers 13, each connected to the second forming area 12. A stopper 3 is slidably connected within each chamber 13. The stopper 3 comprises a first block 31 and a second block 32, which are connected to each other. Block 1 31 is provided with a dovetail block 33, and block 2 32 is provided with a dovetail groove 34, which is slidably connected to the dovetail block 33. The end of block 1 31, away from block 2 32, extends into and fills the second forming area 12.

[0042] Reference Figure 6-Figure 8 Each second block 32 is slidably connected to two rods 4, perpendicular to the mold opening direction. The two rods 4 are located on either side of the second block 32, and the sliding direction of the rods 4 is perpendicular to the sliding direction of the corresponding second block 32. The movable plate 1 is provided with slots 19 for the rods 4 to engage. The rods 4 are inserted into the slots 19 to limit the sliding of the block 3.

[0043] Reference Figure 6-Figure 9The second block 32 is provided with two control mechanisms 5 for respectively controlling the sliding movement of the insertion rod 4. The control mechanism 5 includes a second chamber 51 and a third chamber 52 formed in the second block 32, a slider 53 integrally formed with the insertion rod 4 and slidably connected to the second chamber 51, a second spring 54 provided in the second chamber 51 and in contact with the slider 53, and a control block 55 slidably connected to the third chamber 52.

[0044] Reference Figure 2 、 Figure 5-Figure 7 Two drive units 14 are mounted on the movable platen 1. The drive units 14 are hydraulic cylinders and are located on the side of the two blocks 32 away from the second molding area 12. The output shafts of the drive units 14 extend into the third chamber 52 and are connected to the control block 55. When the output shafts of the drive units 14 are extended or retracted, the control block 55 is driven to slide within the third chamber 52.

[0045] Reference Figure 7-Figure 9 A dovetail groove 2 61 is provided on the end of the control block 55 away from the driving portion 14. One side end of the insertion rod 4 passes through the second chamber 51 and extends into the third chamber 52. A dovetail block 2 62 is provided on the end of the insertion rod 4 extending into the third chamber 52. The dovetail block 2 62 is slidably connected in the dovetail groove 2 61. When the control block 55 moves away from the second molding area 12, it drives the insertion rod 4 to move into the block 2 32 by pressing the dovetail block 2 62, so that the slider 53 slides along with the insertion rod 4 and presses the spring 2 54. When the control block 55 moves close to the second molding area 12, it does not drive the dovetail block 2 62 to move. At the same time, a space is formed in the dovetail groove 2 61 for the dovetail block 2 62 to move and reset. In order to save costs, the control blocks 55 in the two control mechanisms 5 are actually designed as one control block 55.

[0046] Reference Figure 2 、 Figure 3 、 Figure 5 and Figure 10 Four avoidance grooves 15 are formed on the movable platen 1 along the mold opening direction. Two avoidance grooves 15 form a group, and the two avoidance grooves 15 in the same group connect to the same chamber 13. Four limit blocks 21 are fixed to the fixed platen 2. The four limit blocks 21 pass through the four avoidance grooves 15 and extend into the corresponding chamber 1 13. The limit blocks 21 are located on the motion path of the second block 32 moving away from the second molding area 12. When the second block 32 moves to contact the limit blocks 21, the end of the first block 31 extending into the second molding area 12 just moves out of the second molding area 12.

[0047] Reference Figure 2-Figure 5 、 Figure 11, two push blocks 16 are slidably connected to each insert 18 along the movement direction of block 2 32, and the bottom part of the second molding area 12 is opened on the push block 16. Two springs 17 are also placed in each insert 18, and the four springs 17 are respectively located on the side of the four push blocks 16 away from the adjacent block 1 31. The elastic force of the four springs 17 always acts on the four push blocks 16, so that the push blocks 16 always conflict with the block 1 31. When the mold is in the closed state, the block 1 31 presses the push block 16 to limit the movement of the push block 16; when the block 1 31 moves and extends into the cavity 13, the block 1 31 cancels the restriction on the movement of the push block 16, and the spring 17 pushes the push block 16 to move into the cavity 13.

[0048] Reference Figure 5 and Figure 14 The movable platen 1 has two mounting cavities 81, which communicate with two different avoidance grooves 15. The two avoidance grooves 15 communicating with the two mounting cavities 81 are each connected to two chambers 13. A forming rod 82 for forming the assembly hole 93 is slidably connected to each of the two avoidance grooves 15. A mating block 83 is mounted on the forming rod 82, which is slidably connected to the mounting cavity 81. A stop 85 is mounted on the end of the forming rod 82 away from the first forming area 11, and a slope 86 is provided on the end of the stop 85 closer to the fixed platen 2.

[0049] Reference Figure 5 and Figure 14 , a return spring 84 is provided in the mounting cavity 81. The spring is located on the side of the matching block 83 close to the first molding area 11. The elastic force of the spring always acts on the matching block 83. When the mold is opened, under the action of the return spring 84, the block 85 extends into the avoidance groove 15 and conflicts with the side wall of the avoidance groove. The inclined surface 86 is on the movement path of the limit block 21, and the molding rod 82 is located in the movable template 1. When the mold is closed, the limit block 21 presses the inclined surface 86 to drive the block 85 to move into the mounting cavity 81. The end of the molding rod 82 extends into the first molding area 11 to meet the molding of the assembly hole 93. The complete injection molding process of this application mold is as follows: Reference Figure 5 and Figure 11 In the initial state, the two first blocks 31 extend into and fill the two second molding areas 12. The four insertion rods 4 on the two second blocks 32 are respectively inserted into the corresponding slots 19. The injection molding machine then controls the mold to close. When the mold is closed, the two limit blocks 21 press against the two stop blocks 85, causing the two molding rods 82 to move into the first molding.

[0050] Reference Figure 5 and Figure 11After the mold is closed, the injection molding machine injects hot melt plastic into the first molding area 11 to complete the molding of the guard plate body 91 and the two assembly holes 93. When the hot melt plastic fills the first molding area 11, it will impact the two blocks 31. Due to the constraints of the insertion rod 4 and the slot 19, the two blocks 31 will not retreat when impacted by the hot melt plastic. This also prevents the hot melt plastic from flowing into the second molding area 12, ensuring the injection molding of the connection cushion 92.

[0051] Reference Figure 5-Figure 9 After the guard plate body 91 is injection molded, the output shafts of the two drive units 14 retract, driving the control blocks 55 to slide within the third chamber 52, causing the two control blocks 55 to move away from the corresponding second molding area 12. During this process, the two control blocks 55 press against the four second dovetail blocks 62, causing the four insertion rods 4 to move into the corresponding second block 32, thereby releasing the four insertion rods 4 from the four slots 19. As the insertion rods 4 enter the second block 32, they slide with the slider 53 within the second chamber 51, which presses against the second spring 54, compressing it.

[0052] Reference Figure 5-Figure 9 、 Figure 11 、 Figure 12 , the control block 55 will subsequently move to contact the cavity wall of chamber three 52 away from the second molding area 12. At this time, the insertion rod 4 has already moved into block two 32 and released the plug-in fit with the slot 19. The control block 55 will subsequently continue to move away from the second molding area 12 under the control of the driving unit 14, thereby pushing block two 32 to move away from the second molding area 12. When block two 32 moves away from the second molding area 12, it will drive block one 31 to move away from the second molding area 12. Eventually, the two blocks one 31 will move to collide with the four limiting blocks 21. At this time, the ends of the two blocks one 31 away from the two blocks two 32 just move into chamber one 13, so that the second molding area 12 can be used to mold the connecting cushion 92. At this time, the two blocks one 31 are still pressing against the four push blocks 16.

[0053] Reference Figure 5 The injection molding machine then fills the two second molding areas 12 with hot-melt plastic to mold two connecting pads 92. After molding, the two connecting pads 92 are connected to the guard plate body 91. After the two connecting pads 92 are injection-molded, the injection molding machine controls the mold to open, causing the movable platen 1 to move away from the fixed platen 2. During this process, the four limit blocks 21 will move away from the movable platen 1, and the two return springs 84 will rebound and drive the two mating blocks 83 to move, causing the two molding rods 82 to move away from the two assembly holes 93, releasing the inverted structure between the two mating rods and the guard plate body 91.

[0054] Reference Figure 5-Figure 9 、 Figure 11-13After the mold is fully opened, the output shafts of the two driving units 14 retract, driving the two second blocks 32 to move away from the two connecting pads 92. As the two control blocks 55 continue to move away from the connecting pads 92, they also drive the two second blocks 32 to move away from the connecting pads 92. As the two second blocks 32 continue to move away from the connecting pads 92, they drive the two first blocks 31 to move back into the chamber 13, thereby releasing the adhesion between the two first blocks 31 and the two connecting pads 92.

[0055] Reference Figure 5-Figure 9 、 Figure 11-13 In the process of the two blocks 31 moving away from the connecting pad 92, the two blocks 31 no longer press the four push blocks 16, and the four springs 17 will rebound and drive the two push blocks 16 to move toward the corresponding chamber 13. When the four push blocks 16 move, they will push the two connecting pads 92 away from one end of the guard plate body 91 toward the chamber 13 to bend and deform, thereby releasing the adhesion between the two connecting pads 92 and the two second molding areas 12.

[0056] Reference Figure 5-Figure 9 After the two first blocks 31 stop moving, the ejection mechanism 74 ejects the product from the movable mold plate 1, releasing it from the mold. After the product is released from the mold, the output shafts of the two drive units 14 extend, pushing the two second blocks 32 toward the second molding area 12. As the two control blocks 55 move toward their corresponding second molding areas 12, space is created within the two second dovetail grooves 61 for the four second dovetail blocks 62 to return to their original position. The four second springs 54 rebound, driving the four sliders 53 to return a short distance, allowing the four insertion rods 4 to contact the sidewalls of chamber 13.

[0057] Reference Figure 5-Figure 9 The two control blocks 55 then move until they come into contact with the walls of the two chambers 3 52 near the corresponding second molding area 12. The control blocks 55 then continue to move, pushing the two blocks 2 32 toward the corresponding two connection cushions 92. As the two blocks 2 32 move away from the corresponding second molding area 12, they push the two blocks 1 31 into the second molding area 12. As the two blocks 1 31 enter the second molding area 12, they push the four push blocks 16 back into position. During this movement, the four push blocks 16 press against the four springs 17, compressing them.

[0058] Reference Figure 5-Figure 9Once the two second blocks 32 return to their initial positions, the two first blocks 31 extend into and fill the two second molding areas 12. The four insertion rods 4 align with the four slots 19, and the four second springs 54 rebound, driving the four sliders 53 back into position, allowing the four insertion rods 4 to insert into the slots 19, thereby restricting the movement of the two second blocks 32. This restriction also restricts the movement of the two first blocks 31, helping them withstand the impact of the hot melt plastic. The injection molding machine then controls the mold to close, and the injection molding of the next underbody panel begins.

[0059] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A single-cavity, two-color injection molding die for preventing the backlash of an automobile underbody guard plate, comprising a movable die plate (1) and a fixed die plate (2), wherein the movable die plate (1) is provided with a first molding area (11) for molding a guard plate body (91), and two second molding areas (12) for molding a connecting cushion (92), wherein the first molding area (11) is provided with two molding rods (82) for molding an assembly hole (93), and wherein: The movable plate (1) is provided with a chamber (13) connected to the second molding area (12); a block (3) is slidably connected in the chamber (13); a driving portion (14) is provided on the movable plate (1) for driving the block (3) to slide; the end of the block (3) extends into and fills the second molding area (12); an insertion rod (4) is slidably connected to the block (3); a control mechanism (5) is provided on the block (3) for controlling the sliding of the insertion rod (4); a slot (19) is provided on the movable plate (1) for plugging and matching with the insertion rod (4); the insertion rod (4) is inserted into the slot (19) to limit the sliding of the block (3).

2. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 1, characterized in that: The movable template (1) is provided with a plurality of avoidance grooves (15) communicating with the first chamber (13); the fixed template (2) is provided with a plurality of limit blocks (21); the plurality of limit blocks (21) pass through the plurality of avoidance grooves (15) and extend into the first chamber (13); the limit blocks (21) are located on a movement path of the stop block (3) moving away from the second molding area (12); when the stop block (3) moves until it contacts the limit block (21), the end of the stop block (3) just moves out of the second molding area (12).

3. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 2, characterized in that: A push block (16) is slidably connected to the movable template (1), and the bottom area of ​​the second molding area (12) is opened on the push block (16); a spring (17) is provided in the movable template (1), and the elastic force of the spring (17) acts on the push block (16), and the spring (17) always drives the push block (16) to move toward the stop block (3), so that the push block (16) always conflicts with the stop block (3); when the mold is in a closed state, the stop block (3) presses the push block (16) to limit the movement of the push block (16); when the stop block (3) moves and extends into the chamber (13), the stop block (3) cancels the restriction on the movement of the push block (16), and the spring (17) pushes the push block (16) to move into the chamber (13).

4. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 3, characterized in that: The movable plate (1) is provided with an insert (18), the spring (17) is arranged in the insert (18), the push block (16) is slidably connected to the insert (18), and the second molding area (12) is composed of the insert (18) and the push block (16).

5. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 2, characterized in that: The movable plate (1) is provided with two mounting cavities (81), the two mounting cavities (81) are connected to two different avoidance grooves (15), the forming rod (82) is slidably connected in the mounting cavity (81), the forming rod (82) is provided with a matching block (83), the matching block (83) is slidably connected in the mounting cavity (81), and a return spring (84) is provided in the mounting cavity (81), the return spring (84) is sleeved on the forming rod (82) and is connected to the matching block (83). ), a stop block (85) is provided at one end of the forming rod (82) away from the first forming area (11), and the stop block (85) extends into the installation cavity (81). An inclined surface (86) is provided on one end of the stop block (85) facing the fixed template (2). When the mold is closed, the limit block (21) presses against the inclined surface (86) to drive the stop block (85) to move into the installation cavity (81), so that the end of the forming rod (82) extends into the first forming area (11) to meet the molding of the assembly hole (93).

6. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 1, characterized in that: The stopper (3) comprises a block 1 (31) and a block 2 (32) which are connected to each other, the block 1 (31) extends into and fills the second forming area (12), the block 2 (32) is connected to the driving part (14), the block 1 (31) is provided with a dovetail block 1 (33), the block 2 (32) is provided with a dovetail groove 1 (34), the dovetail block 1 (33) is slidably connected in the dovetail groove 1 (34); the insertion rod (4) is slidably connected to the block 2 (32).

7. The single-cavity, two-color injection molding die for preventing the retreat of an automobile underbody guard plate according to claim 6, characterized in that: The control mechanism (5) comprises a second chamber (51) and a third chamber (52) provided on the second block (32), a slider (53) provided on the insertion rod (4) and slidably connected to the second chamber (51), a second spring (54) provided in the second chamber (51) and in contact with the slider (53), and a control block (55) slidably connected to the third chamber (52), wherein the control block (55) is connected to the driving part (14); a dovetail groove (61) is provided on the control block (55), the insertion rod (4) passes through the second chamber (51) and extends into the third chamber (52), and the insertion rod (4) is provided with a second dovetail groove (61). ) is provided with a dovetail block 2 (62) on one end extending into the chamber 3 (52), and the dovetail block 2 (62) is slidably connected in the dovetail groove 2 (61); when the control block (55) moves away from the second molding area (12), it drives the insertion rod (4) to move into the block 2 (32) by pressing the dovetail block 2 (62), and the slider (53) slides following the insertion rod (4) and presses the spring 2 (54); when the control block (55) moves close to the second molding area (12), it does not drive the dovetail block 2 (62) to move, and at the same time, a space for the dovetail block 2 (62) to move back is formed in the dovetail groove 2 (61).

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