Automobile bottom guard plate anti-retreat single-cavity double-color injection molding mold

Abstract

The application relates to a single-cavity double-color injection molding die for preventing the retreat of an automobile underguard, which comprises a movable die plate and a fixed die plate, a first molding area for molding a guard body and a second molding area for molding a connecting soft pad are arranged on the movable die plate, a cavity one communicating with the second molding area is arranged on the movable die plate, a stop block is slidably connected in the cavity one, a driving part for driving the stop block to slide is arranged on the movable die plate, and the end of the stop block extends into and fills the second molding area; an inserting rod is slidably connected on the stop block, a control mechanism for controlling the sliding of the inserting rod is arranged on the stop block, an inserting groove matched with the inserting rod is arranged on the movable die plate, and the inserting rod is inserted into the inserting groove to limit the sliding of the stop block. The application realizes the injection molding of a single-cavity double-color product.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to a single-cavity, two-color injection molding mold for preventing the underbody protection plate of an automobile. Background Technology

[0002] A type of car underbody protection plate, such as Figure 15 As shown, the system includes a skid plate body 91, which is injection molded using a mold. Both sides of the skid plate body 91 are provided with connecting pads 92 and mounting holes 93, with the two mounting holes 93 located on top of the two skid plate bodies 91 respectively. The skid plate body 91 and the connecting pads 92 are injection molded from two different materials, therefore a two-color mold is required to complete the production of the automotive underbody skid plate. Traditional two-color molds use a dual-cavity structure to complete product production, but dual-cavity molds are relatively large, require more steel, and have higher production costs.

[0003] To control costs, the molds used to produce automotive underbody protection plates are designed with a single-cavity, dual-forming-zone structure, thereby controlling mold size and cost. The dual-forming zones refer to the forming zone for forming the underbody protection plate body 91 and the forming zone for forming the connecting pad 92.

[0004] The protective plate body 91 is flat, which makes the molding area on the mold for molding the protective plate body 91 flat and elongated. In order to ensure the complete molding of the protective plate body 91, the injection molding machine will provide a large injection pressure when injecting hot melt plastic into the molding area for molding the protective plate body 91, so as to ensure that the hot melt plastic can fully fill the molding area for molding the protective plate body 91.

[0005] Extremely high injection pressure can easily force hot-melt plastic into the molding area of ​​the connecting pad 92. In order not to affect the injection molding of the connecting pad 92, a sealing structure needs to be designed on the mold to prevent hot-melt plastic from flowing into the molding area used to mold the connecting pad 92 when the molded protective plate body 91 is being injection molded. Summary of the Invention

[0006] This application provides a single-cavity, two-color injection molding die for preventing the underbody panel from slipping, which enables single-cavity, two-color product injection molding.

[0007] The technical solution provided in this application for a single-cavity, two-color injection molding die for preventing the rollover of an automotive underbody protection plate is as follows:

[0008] The utility model provides an automobile bottom fender anti -retreating single -cavity double -color injection moulding mould, including movable die plate and fixed die plate, movable die plate is set with two second forming area for forming connecting soft pad for forming fender body's first forming area, two forming rods for forming assembly hole are equipped in the first forming area, movable die plate is set with cavity no.

[0009] Through adopting above technical scheme, after mould closing, injection molding machine injects hot melt plastic to first forming area, and the forming of fender body is completed.

[0010] Preferably, the movable die plate is provided with a plurality of avoiding grooves communicating with the cavity one, and the fixed die plate is provided with a plurality of limiting blocks, the plurality of limiting blocks penetrating through the plurality of avoiding grooves and extending into the cavity one, the limiting block being located on the movement path of the stop block moving away from the second forming area, and the end of the stop block moving out of the second forming area just when the stop block abuts against the limiting block.

[0011] Through the above technical scheme, when the injection molding machine injects hot melt plastic into the second forming area, the limiting block prevents the stop block from retreating, thereby preventing the occurrence of quality problems such as a gap and a flash during the injection molding of the connecting soft pad. After the injection molding of the connecting soft pad, the limiting block moves out of the cavity one, the driving part drives the stop block to move away from the formed connecting soft pad, thereby eliminating the adhesion between the connecting soft pad and the stop block and reducing the probability of the connecting soft pad being pulled out together with the fender body during demolding.

[0012] Preferably, the movable mold plate is slidably connected with a push block, and the bottom region of the second forming area is arranged on the push block; the movable mold plate is provided with a spring one, and the elastic force of the spring one acts on the push block; the spring one always drives the push block to move towards the stop block, so that the push block always abuts against the stop block; in the mold clamping state, the stop block abuts against the push block to limit the movement of the push block; when the stop block moves into the chamber one, the stop block cancels the limitation on the movement of the push block, and the spring one drives the push block to move into the chamber one.

[0013] By adopting the above technical scheme, in the process that the stop block moves away from the soft pad, the stop block no longer abuts against the push block, the spring one rebounds to drive the push block to move towards the chamber one, and the push block drives the connected soft pad to bend and deform towards the chamber one when moving, so that the adhesion between the soft pad and the second forming area is released. After the product is demolded, the driving part drives the stop block to move back, and the stop block drives the push block to move back when moving back, and the spring one is compressed under stress.

[0014] Preferably, the movable mold plate is provided with an insert block, the spring one is arranged in the insert block, and the push block is slidably connected to the insert block; the second forming area is jointly formed by the insert block and the push block.

[0015] By adopting the above technical scheme, the processing of the second forming area is facilitated, and the installation of the spring one and the push block is also facilitated.

[0016] Preferably, two installation cavities are arranged on the movable mold plate, the two installation cavities are communicated with two different avoiding grooves, the forming rod is slidably connected in the installation cavity, the forming rod is provided with a matching block, the matching block is slidably connected in the installation cavity, a reset spring is arranged in the installation cavity, the reset spring is sleeved on the forming rod and abuts against the matching block, an abutting block is arranged at one end of the forming rod away from the first forming area, the abutting block extends into the installation cavity, and an inclined surface is arranged on one end of the abutting block away from the fixed mold plate; when the mold is clamped, the limiting block abuts against the inclined surface to drive the abutting block to move into the installation cavity, so that the end of the forming rod extends into the first forming area to meet the forming of the assembly hole.

[0017] By adopting the above technical scheme, when the mold is clamped, the limiting block abuts against the inclined surface to drive the abutting block, the forming rod and the matching block to move, the movement of the matching block will abut against the reset spring, and the movement of the forming rod will extend into the first forming area to meet the forming of the assembly hole. After the automobile bottom guard plate is injection molded, the mold is opened, the limiting block moves out of the limiting groove, the spring rebounds to drive the abutting block, the forming rod and the matching block to move towards the avoiding groove, so that the forming rod moves away from the assembly groove, the reverse locking structure of the forming rod and the assembly groove is released, and the smooth demolding of the automobile bottom guard plate is ensured.

[0018] Preferably, the stopper comprises a block one and a block two connected with each other, the block one extends into and fills the second forming area, the block two is connected with the driving part, the block one is provided with a dovetail block one, the block two is provided with a dovetail groove one, and the dovetail block one is slidingly connected in the dovetail groove one; the inserting rod is slidingly connected on the block two.

[0019] By adopting the technical scheme, the position of the driving part and other components is adjusted, so that the driving part and other components can be reasonably installed on the movable die plate, and installation interference between the driving part and other components and other components on the movable die plate is avoided.

[0020] Preferably, the control mechanism comprises a cavity two and a cavity three provided on the block two, a sliding block provided on the inserting rod and slidingly connected in the cavity two, a spring two provided in the cavity two and abutting against the sliding block, and a control block slidingly connected in the cavity three and connected with the driving part; the control block is provided with a dovetail groove two, the inserting rod passes through the cavity two and extends into the cavity three, an end of the inserting rod extending into the cavity three is provided with a dovetail block two, the dovetail block two is slidingly connected in the dovetail groove two; when the control block moves away from the second forming area, the inserting rod is driven to move into the block two by abutting against the dovetail block two, and the sliding block slides along with the inserting rod and abuts against the spring two; when the control block moves close to the second forming area, the dovetail block two is not driven to move, and meanwhile, a space for the movement reset of the dovetail block two is formed in the dovetail groove two.

[0021] By adopting the technical scheme, after the guard plate body is injection molded, the driving part drives the control block to slide in the cavity three, so that the control block moves away from the second forming area. During this process, the control block will press the dovetail block two, so that the insertion rod moves into the block body two to release the insertion fit between the insertion rod and the insertion slot. During the process that the insertion rod moves into the block body two, the insertion rod will slide with the sliding block in the cavity two, the sliding block two will press the spring two, and the spring two will be compressed under stress. Subsequently, the control block will move to abut against the cavity wall of the cavity three, and at this time, the insertion rod also moves into the block body two. Subsequently, the control block will continue to move away from the second forming area, thereby driving the block body two to move away from the second forming area, and when the block body two moves away from the second forming area, the block body one will be driven to move away from the second forming area, so that the second forming area can be used for molding the connecting cushion. After the subsequent product is demolded, the driving part drives the control block to move close to the second forming area, when the control block moves close to the second forming area, the dovetail groove two forms a space for the movement of the dovetail block two, the spring two will rebound to drive the sliding block to move back a small distance, so that the insertion rod abuts against the side wall of the cavity one. Then the control block moves to abut against the cavity wall of the cavity three close to the second forming area and drives the block body two to move back, once the block body two moves back to the initial position, the insertion rod will be aligned with the insertion slot, the spring two will continue to rebound to drive the sliding block to move back, so that the insertion rod is inserted into the insertion slot, thereby limiting the movement of the block body two, and when the movement of the block body two is limited, the movement of the block body one is also limited. Thus, the block body one can help resist the impact of hot melt plastic.

[0022] The technical effects of the present application mainly embody in the following aspects:

[0023] 1. The present application realizes twice anti-retreat of the block body one through the cooperation of the insertion slot and the insertion rod and the cooperation of the block body two and the limiting block, thereby ensuring high-quality injection molding of the connecting cushion.

[0024] 2. The present application releases the limitation on the second retreat of the block body two after the mold is opened, so that the block body two can move away from the connecting cushion with the block body one, thereby releasing the adhesion between the block body one and the connecting cushion.

[0025] 3. The present application sets the push block and the spring one, controls the movement of the push block through the movement of the block body one, so that the push block can push the end of the connecting cushion to bend and deform when the block body two retreats for the second time, thereby releasing the adhesion between the connecting cushion and the second forming area. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure schematic diagram in the mold clamped state.

[0027] Figure 2 is Figure 1 structure schematic diagram of the fixed mold plate and the movable mold plate.

[0028] Figure 3 is a structure schematic diagram of the movable mold plate.

[0029] Figure 4 is a structural diagram of the insert.

[0030] Figure 5 is Figure 2 is a sectional view of the fixed die plate and the moving die plate along the line A-A.

[0031] Figure 6 is a structural diagram of the stop block, the insertion rod, and the control mechanism.

[0032] Figure 7 is a partial mechanism diagram of the moving die plate in a top view state.

[0033] Figure 8 is Figure 7 is a partial sectional view of the fixed die plate along the line B-B.

[0034] Figure 9 is a mechanism diagram of the insertion rod, the sliding block, the control block, and the driving part.

[0035] Figure 10 is a structural diagram of the fixed die plate.

[0036] Figure 11 is Figure 5 is a partial enlarged view at C.

[0037] Figure 12 is Figure 11 is a structural diagram of the block body one when moving out of the second forming area.

[0038] Figure 13 is Figure 11 is a structural diagram of the block body one when moving into the cavity one and after the spring one drives the push block to move.

[0039] Figure 14 is Figure 5 is a partial enlarged view at D.

[0040] Figure 15 is a structural diagram of the automobile underbody panel.

[0041] : 1, movable mold plate; 11, first forming area; 12, second forming area; 13, chamber one; 14, driving part; 15, avoiding groove; 16, push block; 17, spring one; 18, insert block; 19, insertion slot; 2, fixed mold plate; 21, limiting block; 3, stop block; 31, block one; 32, block two; 33, dovetail block one; 34, dovetail groove one; 4, insertion rod; 5, control mechanism; 51, chamber two; 52, chamber three; 53, sliding block; 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, mounting cavity; 82, forming rod; 83, matching block; 84, reset spring; 85, abutting block; 86, inclined surface; 91, guard plate body; 92, connecting soft pad; 93, assembly hole. DETAILED DESCRIPTION

[0042] The application will be further described in detail below with reference to the drawings, so that the technical scheme of the application is easier to understand and master.

[0043] Referring to Figures 1-4 The automobile bottom guard plate anti-retraction single-cavity double-color injection molding mold of the embodiment comprises an upper fixed plate 71, a hot runner plate 72, a fixed mold plate 2, a movable mold plate 1, a plurality of mold feet 73, an ejection mechanism 74, and a lower fixed plate 75. The movable mold plate 1 is provided with a first forming area 11 for forming a guard plate body 91. Two insert blocks 18 are detachably connected to the movable mold plate 1. The two insert blocks 18 are each provided with a second forming area 12 for forming a connecting soft pad 92. (The ejection mechanism 74 in the application is a conventional ejector plate and ejector pin structure, which is well known in the art.)

[0044] Referring to Figure 2 Referring to

[0045] Referring to Figures 6-8 Each block two 32 is slidably connected to two insertion rods 4 perpendicular to the mold opening direction. The two insertion rods 4 are located on the two sides of the block two 32, and the sliding direction of the insertion rod 4 is perpendicular to the sliding direction of the corresponding block two 32. The movable mold plate 1 is provided with an insertion slot 19 matched with the insertion rod 4. The insertion rod 4 is inserted into the insertion slot 19 to limit the sliding of the stop block 3.

[0046] Referring to Figures 6-9The second block 32 is provided with two sets of control mechanisms 5 for controlling the sliding of the insertion rod 4 respectively. The control mechanism 5 includes a second chamber 51 and a third chamber 52 formed on the second block 32, a slider 53 integrally formed on the insertion rod 4 and slidably connected in the second chamber 51, a second spring 54 disposed in the second chamber 51 and in contact with the slider 53, and a control block 55 slidably connected in the third chamber 52.

[0047] Reference Figure 2 , Figures 5-7 Two drive units 14 are installed on the moving template 1. The drive units 14 are hydraulic cylinders. The two drive units 14 are located on the side of the two blocks 32 away from the second forming area 12. The output shaft of the drive unit 14 extends into the cavity 3 52 and is connected to the control block 55. When the output shaft of the drive unit 14 extends or retracts, it can drive the control block 55 to slide within the cavity 3 52.

[0048] Reference Figures 7-9 The control block 55 has a dovetail groove 61 at the end away from the drive unit 14. One end of the insertion rod 4 passes through the second chamber 51 and extends into the third chamber 52. The end of the insertion rod 4 extending into the third chamber 52 has a dovetail block 62, which is slidably connected in the dovetail groove 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 body 32 by pressing the dovetail block 62, so that the slider 53 slides with the insertion rod 4 and presses the spring 54. When the control block 55 moves closer to the second molding area 12, it does not drive the dovetail block 62 to move, and at the same time, a space is formed in the dovetail groove 61 for the dovetail block 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.

[0049] Reference Figure 2 , Figure 3 , Figure 5 and Figure 10 The moving template 1 has four clearance grooves 15 along the mold opening direction, with two clearance grooves 15 forming a group, and the two clearance grooves 15 in the same group connecting to the same cavity 13. The fixed template 2 has four limiting blocks 21 fixed on it, which pass through the four clearance grooves 15 and extend into the corresponding cavity 13. The limiting blocks 21 are located on the movement path of the second block 32 moving away from the second molding area 12. When the second block 32 moves to the point of contact with the limiting block 21, the end of the first block 31 extending into the second molding area 12 just moves out of the second molding area 12.

[0050] Reference Figures 2-5 , Figure 11Each block 18 is slidably connected with two push blocks 16 along the moving direction of the block body two 32, and the bottom part of the second forming area 12 is provided on the push blocks 16. Two springs one 17 are further arranged in each block 18, and the four springs one 17 are respectively located on the side of the four push blocks 16 away from the adjacent block body one 31. The elastic force of the four springs one 17 always acts on the four push blocks 16, so that the push blocks 16 always abut against the block body one 31. In the closed state of the mold, the block body one 31 abuts against the push blocks 16 to limit the movement of the push blocks 16; when the block body one 31 moves into the cavity one 13, the block body one 31 cancels the limitation on the movement of the push blocks 16, and the spring one 17 pushes the push blocks 16 to move into the cavity one 13.

[0051] With reference to Figure 5 and Figure 14 , two installation cavities 81 are provided on the movable die plate 1, the two installation cavities 81 are communicated with two different avoiding grooves 15, and the two avoiding grooves 15 communicated with the two installation cavities 81 are respectively communicated with the two cavities one 13. The two avoiding grooves 15 are slidably connected with a forming rod 82 for forming an assembly hole 93. The forming rod 82 is provided with a cooperation block 83 slidably connected in the installation cavity 81. The end of the forming rod 82 away from the first forming area 11 is provided with an abutting block 85, and the end of the abutting block 85 close to the fixed die plate 2 is provided with an inclined surface 86.

[0052] With reference to Figure 5 and Figure 14 , the installation cavity 81 is provided with a reset spring 84, and the spring is located on the side of the cooperation block 83 close to the first forming area 11, and the elastic force of the spring always acts on the cooperation block 83. When the mold is opened, the abutting block 85 extends into the avoiding groove 15 and abuts against the side wall of the avoiding groove under the action of the reset spring 84, the inclined surface 86 is located in the movement path of the limiting block 21, and the forming rod 82 is located in the movable die plate 1. When the mold is closed, the limiting block 21 abuts against the inclined surface 86 to drive the abutting block 85 to move into the installation cavity 81. The end of the forming rod 82 extends into the first forming area 11 to meet the forming of the assembly hole 93.

[0053] The complete injection molding process of the mold is as follows:

[0054] With reference to Figure 5 and Figure 11 , in the initial state, two block bodies one 31 extend into and fill two second forming areas 12, and four insertion rods 4 on two block bodies two 32 are respectively inserted into corresponding insertion grooves 19. Then the injection molding machine controls the mold to be closed, and when the mold is closed, the two limiting blocks 21 abut against the two abutting blocks 85 to drive the two forming rods 82 to move into the first forming.

[0055] With reference to Figure 5 and Figure 11, the injection molding machine injects hot melt plastic into the first forming 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 forming area 11, it will impact the two blocks of body one 31. Due to the restriction of the insertion rod 4 and the insertion slot 19, the two blocks of body one 31 will not retreat when impacted by the hot melt plastic, which also prevents the hot melt plastic from flowing into the second forming area 12, ensuring the injection molding of the connecting cushion 92.

[0056] Referring to Figures 5-9 , after the guard plate body 91 is injection molded, the output shaft of the two drive parts 14 is retracted, driving the control blocks 55 to slide in the chamber three 52, so that the two control blocks 55 move away from the corresponding second forming area 12. During this process, the two control blocks 55 will press the four dovetail blocks two 62, causing the four insertion rods 4 to move into the corresponding blocks of body two 32, thereby releasing the insertion of the four insertion rods 4 and the four insertion slots 19. During the process of the insertion rod 4 entering the block of body two 32, the insertion rod 4 will slide with the slider 53 in the chamber two 51, and the slider 53 will press the spring two 54, causing the spring two 54 to be compressed under stress.

[0057] Referring to Figures 5-9 , Figure 11 , Figure 12 , the subsequent control blocks 55 will move to abut against the cavity wall of the chamber three 52 away from the second forming area 12. At this time, the insertion rod 4 has already moved into the block of body two 32 and released the insertion with the insertion slot 19. The control blocks 55 will continue to move away from the second forming area 12 under the control of the drive part 14, thereby pushing the block of body two 32 to move away from the second forming area 12. When the block of body two 32 moves away from the second forming area 12, it will drive the block of body one 31 to move away from the second forming area 12. Finally, the two blocks of body one 31 will move to collide with the four limiting blocks 21, and at this time, the two blocks of body one 31 will move into the chamber one 13 away from the end of the two blocks of body two 32, thereby allowing the second forming area 12 to be used for molding the connecting cushion 92. At this time, the two blocks of body one 31 are still pressing the four push blocks 16.

[0058] Referring to Figure 5 , then the injection molding machine fills hot melt plastic into the two second forming areas 12 for molding the two connecting cushions 92. After the two connecting cushions 92 are molded, they are connected to the guard plate body 91. After the two connecting cushions 92 are injection molded, the injection molding machine controls the mold to open, causing the movable mold plate 1 to move away from the fixed mold plate 2. During this process, the four limiting blocks 21 will move away from the movable mold plate 1, the two reset springs 84 will rebound to drive the two blocks of cooperation 83 to move, causing the two forming rods 82 to move away from the two assembly holes 93, and releasing the reverse structure of the two cooperation rods and the guard plate body 91.

[0059] Referring to Figures 5-9 , Figures 11-13, after the mold is completely opened, the output shafts of the two driving parts 14 retract to drive the two block bodies two 32 to move away from the two connecting soft pads 92. When the two control block bodies 55 continue to move away from the connecting soft pads 92, the two control block bodies 55 also drive the two block bodies two 32 to move away from the connecting soft pads 92. When the two block bodies two 32 continue to move away from the connecting soft pads 92, the two block bodies two 32 drive the two block bodies one 31 to move back into the cavities one 13, thereby releasing the adhesion between the two block bodies one 31 and the two connecting soft pads 92.

[0060] Referring to Figures 5-9 、 Figures 11-13 During the process of moving away from the connecting soft pads 92, the two block bodies one 31 no longer press against the four push blocks 16, and the four springs one 17 rebound to drive the two push blocks 16 to move towards the corresponding cavities one 13. When the four push blocks 16 move, they push the two connecting soft pads 92 to bend away from one end of the guard plate body 91 towards the cavities one 13, thereby releasing the adhesion between the two connecting soft pads 92 and the two second forming areas 12.

[0061] Referring to Figures 5-9 After the two block bodies one 31 stop moving, the ejection mechanism 74 ejects the product from the movable die plate 1, so that the product is demolded. After the product is demolded, the output shafts of the two driving parts 14 are elongated to drive the two block bodies two 32 to move close to the second forming areas 12. When the two control block bodies 55 move close to the corresponding cavity walls of the second forming areas 12, spaces are formed in the two dovetail grooves two 61 for the four dovetail blocks two 62 to move back to the original position. The four springs two 54 rebound to drive the four sliding blocks 53 to move back a small distance, so that the four insertion rods 4 are in contact with the side walls of the cavities one 13.

[0062] Referring to Figures 5-9 Subsequently, the two control block bodies 55 move to be in contact with the cavity walls of the two cavities three 52 close to the corresponding second forming areas 12, and then the control block bodies 55 continue to move and drive the two block bodies two 32 to move close to the corresponding two connecting soft pads 92. During the process of moving away from the corresponding second forming areas 12, the two block bodies two 32 drive the two block bodies one 31 to move into the second forming areas 12. When the two block bodies one 31 move into the second forming areas 12, they drive the four push blocks 16 to move back to the original position. During the process of moving back to the original position, the four push blocks 16 press against the four springs one 17, so that the four springs one 17 are compressed under stress.

[0063] Referring to Figures 5-9Once the two blocks 32 are reset to the original position, the two blocks 31 also extend into and fill the two second forming areas 12. The four insertion rods 4 are moved to align with the four insertion slots 19, and the four springs 54 are driven to reset the four sliders 53, so that the four insertion rods 4 are inserted into the insertion slots 19, thereby limiting the movement of the two blocks 32. When the movement of the two blocks 32 is limited, the movement of the two blocks 31 is also limited, thereby helping the blocks 31 to resist the impact of the hot melt plastic. Then the injection molding machine controls the mold to close, and the next automobile underbody shield is formed.

[0064] Of course, the above is only a typical example of the present application, and in addition to this, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A single-cavity double-color injection molding mold for preventing the retreat of an automobile underguard, comprising a movable mold plate (1) and a fixed mold plate (2), a first molding area (11) for molding a guard body (91) is formed on the movable mold plate (1), two second molding areas (12) for molding connecting soft pads (92) are formed on the movable mold plate (1), two molding rods (82) for molding assembling holes (93) are arranged in the first molding area (11), characterized in that: The movable die plate (1) is provided with a cavity I (13) communicated with the second forming area (12), a stop block (3) is slidably connected in the cavity I (13), the movable die plate (1) is provided with a driving part (14) for driving the stop block (3) to slide, and the end of the stop block (3) extends into and fills the second forming area (12); the stop block (3) is slidably connected with a plug rod (4), the stop block (3) is provided with a control mechanism (5) for controlling the sliding of the plug rod (4), the movable die plate (1) is provided with a plug groove (19) matched with the plug rod (4), and the plug rod (4) is inserted into the plug groove (19) to limit the sliding of the stop block (3); the movable die plate (1) is provided with a plurality of avoiding grooves (15) communicated with the cavity I (13), the fixed die plate (2) is provided with a plurality of limiting blocks (21), and the plurality of limiting blocks (21) extend into the cavity I (13) through the plurality of avoiding grooves (15); the limiting block (21) is located on the movement path of the stop block (3) moving away from the second forming area (12), and when the stop block (3) moves to abut against the limiting block (21), the end of the stop block (3) just moves out of the second forming area (12); the movable die plate (1) is slidably connected with a push block (16), and the bottom area of the second forming area (12) is provided on the push block (16); the movable die plate (1) is provided with a spring I (17), the spring I (17) is elastically connected to the push block (16), and the spring I (17) always drives the push block (16) to move towards the stop block (3), so that the push block (16) always abuts against the stop block (3); in the mold clamping state, the stop block (3) abuts against the push block (16) to limit the movement of the push block (16); when the stop block (3) moves into the cavity I (13), the stop block (3) cancels the limitation on the movement of the push block (16), and the spring I (17) drives the push block (16) to move into the cavity I (13).

2. The single-cavity double-color injection molding mold for preventing the automobile underguard from retreating according to claim 1, characterized in that: The movable die plate (1) is provided with an insert block (18), the spring I (17) is arranged in the insert block (18), the push block (16) is slidably connected to the insert block (18), and the second forming area (12) is jointly formed by the insert block (18) and the push block (16).

3. The single-cavity double-color injection molding mold for preventing the automobile underguard from retreating according to claim 1, characterized in that: Two installation cavities (81) are formed in the movable die plate (1), the two installation cavities (81) are communicated with two different avoiding grooves (15), the forming rod (82) is slidably connected in the installation cavity (81), the forming rod (82) is provided with a matching block (83), the matching block (83) is slidably connected in the installation cavity (81), the installation cavity (81) is provided with a reset spring (84), the reset spring (84) is sleeved on the forming rod (82) and abuts against the matching block (83), one end of the forming rod (82) away from the first forming area (11) is provided with an abutting block (85), the abutting block (85) extends into the installation cavity (81), an inclined surface (86) is formed in one end of the abutting block (85) facing the fixed die plate (2), when the mold is closed, the limiting block (21) abuts against the inclined surface (86) to drive the abutting 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), so as to meet the molding of the assembly hole (93).

4. The single-cavity double-color injection molding mold for preventing the automobile underguard from retreating according to claim 1, characterized in that: The block (3) comprises a block body one (31) and a block body two (32) connected with each other, the block body one (31) extends into and fills the second forming area (12), the block body two (32) is connected with the driving part (14), the block body one (31) is provided with a dovetail block one (33), the block body two (32) is provided with a dovetail groove one (34), and the dovetail block one (33) is slidably connected in the dovetail groove one (34); the inserting rod (4) is slidably connected on the block body two (32).

5. The anti-retraction single-cavity double-color injection molding mold for an automobile underguard according to claim 4, characterized in that: The control mechanism (5) comprises a cavity two (51) and a cavity three (52) formed in the block body two (32), a sliding block (53) provided on the inserting rod (4) and slidably connected in the cavity two (51), a spring two (54) provided in the cavity two (51) and abutting against the sliding block (53), and a control block (55) slidably connected in the cavity three (52), wherein the control block (55) is connected with the driving part (14); the control block (55) is provided with a dovetail groove two (61), the inserting rod (4) passes through the cavity two (51) and extends into the cavity three (52), the inserting rod (4) is provided with a dovetail block two (62) on one end extending into the cavity three (52), and the dovetail block two (62) is slidably connected in the dovetail groove two (61); when the control block (55) moves away from the second forming area (12), the inserting rod (4) is driven to move into the block body two (32) by abutting against the dovetail block two (62), and the sliding block (53) slides along with the inserting rod (4) and abuts against the spring two (54); when the control block (55) moves close to the second forming area (12), the dovetail block two (62) is not driven to move, and a space for the movement reset of the dovetail block two (62) is formed in the dovetail groove two (61).

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