Mechanical limiting and oil cylinder cooperative driving mechanism for inner extraction of two-color injection mold top side

Abstract

This invention discloses a mechanical limiting and hydraulic cylinder coordinated driving mechanism for the inner pull-out mechanism on the top side of a two-color injection mold, relating to the field of two-color injection mold technology. The mechanism includes an inner pull-out shovel base and a limiting drive rod fixed to the fixed mold side, and a hydraulic cylinder, an inner pull-out steering block, an inner pull-out main body, and a limiting slider disposed on the moving mold side. The limiting slider has a limiting groove, and the limiting drive rod has an inclined portion that cooperates with it. The inner pull-out steering block has a limiting hole, and the limiting slider can be inserted into or removed from the limiting hole under the action of an elastic element. During mold opening, the limiting drive rod separates from the limiting groove, and the elastic element drives the limiting slider to lock the inner pull-out steering block, preventing it from falling. During mold closing, the limiting drive rod drives the limiting slider to unlock via the inclined surface, and then the inner pull-out shovel base precisely resets the inner pull-out steering block. This invention, through a purely mechanical limiting structure, eliminates the risk of the top side slider falling during power switching, improves reset accuracy, eliminates the auxiliary hydraulic cylinder, simplifies the mold structure, and reduces costs.

Description

Technical Field

[0001] This invention relates to the field of two-color injection mold technology, and more particularly to a mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner pull-out of the top side of a two-color injection mold. Background Technology

[0002] In two-color injection molded products such as automotive headlights, when the inner side of the product has a large stroke and a large area of ​​undercut structure, the clamping force of the molded product on the sliding block inside the mold is enormous. Conventional hydraulic drive mechanisms cannot independently overcome this clamping force to complete safe core pulling. Therefore, the industry generally adopts a combined drive scheme of "mechanical initial pulling with inclined guide pillars + final pulling with hydraulic cylinders".

[0003] However, this existing technology has the following drawbacks in practical applications: First, when the sliding block on the day side (the side in the direction of the mold ejector pin) disengages from the mechanical drive mechanism such as the inclined guide pillar during the mold opening process, the sliding block loses its mechanical constraint and is prone to free fall under its own weight and the inertia of mold opening, causing the cylinder piston rod to bend or break, or the sliding block to directly hit the mold core, resulting in mold damage.

[0004] Secondly, during the mold closing and reset stage, the slider position is easily affected by gravity due to the top side structure, which makes it impossible for the inclined guide post to be accurately inserted into the guide hole of the slider, thus causing serious failures such as mold collision and mold jamming, significantly increasing mold maintenance costs and production downtime.

[0005] Third, to avoid the above problems, existing technologies often require the addition of an auxiliary locking cylinder to lock the position of the slider. This leads to a more complex mold structure, increased installation space, and redundant hydraulic lines, which significantly increases the manufacturing cost of the mold and the difficulty of subsequent maintenance.

[0006] Therefore, developing a drive mechanism that can safely, reliably, and cost-effectively solve the problem of controlling the position of the sliding block within a large stroke on the top side is a technical challenge that urgently needs to be addressed in this field. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner pull of the top side of a two-color injection mold. This invention achieves rigid position locking within the switching range between mechanical drive and hydraulic cylinder drive through a purely mechanical limiting structure, eliminating the risk of slider falling and mold collision, improving reset accuracy, and simplifying the mold structure.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner core pulling of a two-color injection mold includes a hydraulic cylinder on the moving mold side, an inner core pulling steering block connected to the hydraulic cylinder, an inner core pulling body connected to the inner core pulling steering block, and an inner core pulling spatula base on the fixed mold side for driving the inner core pulling steering block and the inner core pulling body to complete the initial core pulling and separate the inner core pulling body from the product. It also includes a limiting drive rod fixed to the fixed mold side, a limiting slider slidably disposed on the moving mold side, and an elastic element acting on the limiting slider and enabling the limiting slider to move towards the inner core pulling steering block. The front end of the limiting drive rod has a first inclined portion. The sliding block has a limiting groove, and a second inclined portion matching the first inclined portion is formed in the limiting groove; the inner pull-out turning block has a limiting hole that cooperates with the limiting sliding block; when the mold is opened, the limiting drive rod is inserted into the limiting groove, and the limiting sliding block is brought close to the limiting hole by the elastic element through the sliding cooperation of the first inclined portion and the second inclined portion. When the inner pull-out shovel base is about to detach from the inner pull-out turning block, the limiting drive rod is pulled out from the limiting groove, and the elastic element drives the limiting sliding block to insert into the limiting hole, locking the inner pull-out turning block.

[0009] As a preferred embodiment of the present invention, the hydraulic cylinder is connected to the internal steering block via a hydraulic cylinder hanger.

[0010] As a preferred embodiment of the present invention, a guide block is also fixedly provided on the moving mold side, the guide block being slidably engaged with the limiting slider to guide the moving direction of the limiting slider.

[0011] As a preferred embodiment of the present invention, a limiting connecting seat is provided on the moving mold side, and a connecting rod is fixedly connected to the limiting connecting seat. The elastic element is a compression spring, which is sleeved on the connecting rod, with one end abutting against the limiting connecting seat and the other end abutting against the limiting slider.

[0012] As a preferred embodiment of the present invention, a wear-resistant sheet is fixedly provided on the back of the limiting slider.

[0013] As a preferred embodiment of the present invention, the inner pull-out steering block is provided with a connecting hole, and the inner pull-out shovel base is connected with a shovel base slider, the shovel base slider having a T-shaped structure and slidingly engaging with the connecting hole.

[0014] As a preferred embodiment of the present invention, the inner drawing steering block and the inner drawing body are slidably connected by a T-shaped block, and the two move in different directions.

[0015] The present invention also provides a two-color injection mold, including the mechanical limiting and hydraulic cylinder co-drive mechanism for the inner pulling of the top side of the two-color injection mold as described in any of the above claims.

[0016] The present invention also provides a collaborative driving method based on any of the above-described mechanisms, including a mold opening stage and a mold closing stage: Mold making stage: a. The inner core extraction is completed by driving the inner core extraction steering block and the inner core extraction body to complete the initial core extraction. b. At the same time, the limit drive rod moves synchronously, the limit drive rod is pulled out from the limit groove, and the elastic element pushes the limit slider to insert into the limit hole of the inner pull steering block, locking the inner pull steering block; c. The hydraulic cylinder drives the internal core pulling steering block and the internal core pulling body to complete the final core pulling to the predetermined position; Mold closing stage: d. The hydraulic cylinder drives the inner pull steering block and the inner pull main body to pre-reset to the limit locking position; e. When the mold is closed, the limit drive rod is inserted into the limit slot, and the inclined surface pushes the limit slider to compress the elastic element and disengage from the limit hole, thus releasing the limit; f. The inner pull shovel base is inserted into the inner pull steering block. The inner pull steering block and the inner pull body are precisely reset by the inner pull shovel base drive, and the mold locking is completed.

[0017] By adopting the above-described technical solution, the beneficial effects of the present invention compared with the prior art are as follows: 1. The mechanical limiting and hydraulic cylinder coordinated drive mechanism of the two-color injection mold top side inner pull of the present invention significantly improves reliability: Through the purely mechanical elastic limiting mechanism, rigid position holding is provided during the "vacuum period" of power switching between hydraulic cylinder and inclined guide column, which fundamentally eliminates the risk of the top side slider falling due to gravity, completely avoids hydraulic cylinder damage and mold collision accidents, and greatly improves the safety of mold operation.

[0018] 2. The mechanical limit and hydraulic cylinder coordinated drive mechanism for the inner pull of the two-color injection mold of the present invention reduces production costs: The present invention relies entirely on the mold opening and closing action to trigger, without the need for additional auxiliary hydraulic cylinders, hydraulic control valves and supporting pipelines. The mold structure is more compact, and the manufacturing cost can be reduced by 15%-20%. At the same time, it significantly reduces the workload and cost of later maintenance.

[0019] 3. The mechanical limit and hydraulic cylinder collaborative drive mechanism for the inner pull of the two-color injection mold top side of the present invention improves the reset accuracy: The graded reset strategy of "hydraulic cylinder pre-reset to limit point + inclined guide post (shovel base) final fine positioning" is adopted. The limit slider provides a clear intermediate positioning reference, which ensures that the inclined guide post can be accurately inserted every time, which greatly improves the mold closing reset accuracy and reduces the need for manual debugging and correction.

[0020] 4. The mechanical limiting and hydraulic cylinder coordinated drive mechanism of the inner pull-out of the two-color injection mold of the present invention has a compact structure: the mechanical limiting mechanism is integrated on the side of the inner pull-out slider, which occupies little space, reduces hydraulic components and installation space, and improves the overall adaptability of the mold.

[0021] 5. The mechanical limit and hydraulic cylinder coordinated drive mechanism for the inner pull of the top side of the two-color injection mold of the present invention has strong versatility: the mechanism does not rely on complex electronic or hydraulic control, works stably and reliably, and can be widely used in various two-color / multi-color injection molds, especially suitable for molds of large and complex molding products such as automotive lamps and home appliance shells. Attached Figure Description

[0022] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings: Figure 1 This is the front view of an example of the present invention; Figure 2 This is a left view of an example of the present invention; Figure 3 This is a bottom view of an example of the present invention; Figures 4 to 7 This is a perspective view of an example of the present invention; The reference numerals in the accompanying drawings include: 1. Hydraulic cylinder; 2. Inner shovel base; 21. Shovel base slider; 3. Inner shovel steering block; 31. Limiting hole; 32. Connecting hole; 4. Inner shovel body; 41. T-block; 5. Limiting drive rod; 5. First inclined part; 6. Limiting slider; 61. Limiting groove; 62. Second inclined part; 63. Limiting connecting seat; 64. Connecting rod; 65. Wear-resistant plate; 7. Elastic element; 8. Hydraulic cylinder hanger; 9. Guide block. Detailed Implementation

[0023] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. It should be pointed out that all accompanying drawings are exemplary representations. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] Reference Figures 1 to 7 , Figure 1 This is the front view of an example of the present invention. Figure 2 This is a left view of an example of the present invention. Figure 3 This is a bottom view of an example of the present invention. Figures 4 to 7 This is a perspective view of an example of the present invention. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner pulling of the top side of the two-color injection mold provided by the present invention is applied to a large automotive lighting horizontal through-beam two-color injection mold. It includes a hydraulic cylinder 1, an inner pulling shovel base 2, an inner pulling steering block 3, an inner pulling body 4, a limiting drive rod 5, a limiting slider 6, an elastic element 7, a hydraulic cylinder hanger 8, and a guide block 9. The inner pulling shovel base 2 and the limiting drive rod 5 are fixed on the fixed mold side and are used to simultaneously drive the inner pulling and limiting mechanisms. The hydraulic cylinder 1, the inner pulling steering block 3, the inner pulling body 4, the limiting slider 6, the elastic element 7, the hydraulic cylinder hanger 8, and the guide block 9 are all installed on the moving mold side and move with the moving mold to complete the core pulling and resetting of the product.

[0028] More specifically, the hydraulic cylinder 1 is fixedly mounted on the moving mold side, and the hydraulic cylinder 1 is connected to the inner pulling steering block 3. The hydraulic cylinder 1 is preferably connected to the inner pulling steering block 3 through the hydraulic cylinder hanger 8. The inner pulling steering block 3 and the inner pulling body 4 are slidably connected through the T-shaped block 41. The two move in different directions, thereby realizing the conversion of the horizontal driving force into the core pulling motion. The inner pulling shovel base 2 is mounted on the fixed mold side. The inner pulling shovel base 2 is used to drive the inner pulling steering block 3 and the inner pulling body 4 to complete the initial core pulling and separate the inner pulling body 4 from the product. The inner pulling steering block 3 is provided with a connecting hole 32 for cooperating with the inner pulling shovel base 2. The inner pulling shovel base 2 is connected with a shovel base slider 21. The shovel base slider 21 has a T-shaped structure and slides in cooperation with the connecting hole 32. At the same time, the inner pulling steering block 3 is provided with a limiting hole 31 that cooperates with the limiting slider 6.

[0029] The limiting drive rod 5 is fixed to the fixed mold side, and the front end of the limiting drive rod 5 is provided with a first inclined part 51. The limiting slider 6 is slidably disposed on the moving mold side. In one embodiment, a guide block 9 is also fixedly disposed on the moving mold side. The guide block 9 is slidably engaged with the limiting slider 6 to guide the movement direction of the limiting slider 6. A limiting groove 61 is formed on the limiting slider 6, and a second inclined part 62 matching the first inclined part 51 is formed in the limiting groove 61. The elastic element 7 acts on the limiting slider 6 and can cause the limiting slider 6 to move inward toward the direction of the limiting block 3. In a more specific embodiment, a limiting connecting seat 63 is provided on the moving mold side. A connecting rod 64 is fixedly connected to the limiting connecting seat 63. The elastic element 7 is a compression spring, which is sleeved on the connecting rod 64. One end of the spring abuts against the limiting connecting seat 63, and the other end abuts against the limiting slider 6. The compression spring is always in a pre-compressed state to provide the limiting slider 6 with a thrust to insert into the limiting hole 31. In one embodiment, to increase durability, a wear-resistant sheet 65 is fixedly provided on the back of the limiting slider 6.

[0030] When the mold is opened, the limiting drive rod 5 is inserted into the limiting groove 61. Through the sliding cooperation of the first inclined part 51 and the second inclined part 62, the limiting slider 6 is brought close to the limiting hole 31 by the elastic element 7. When the inner pull shovel base 2 is about to disengage from the inner pull steering block 3, the limiting drive rod 5 is pulled out from the limiting groove 61, and the elastic element 7 drives the limiting slider 6 to insert into the limiting hole 31, locking the inner pull steering block 3.

[0031] The present invention also provides a two-color injection mold, including the mechanical limiting and hydraulic cylinder co-drive mechanism for the inner pulling of the top side of the two-color injection mold as described above.

[0032] The present invention also provides a collaborative driving method based on any of the above-described mechanisms, including a mold opening stage and a mold closing stage: Mold making stage: a. The inner core extraction shovel base 2 drives the inner core extraction steering block 3 and the inner core extraction body 4 to complete the initial core extraction; b. At the same time, the limit drive rod 5 moves synchronously, the limit drive rod 5 is pulled out from the limit groove 61, and the elastic element 7 pushes the limit slider 6 to insert into the limit hole 31 of the inner pull steering block 3, locking the inner pull steering block 3. c. The hydraulic cylinder 1 drives the inner core pulling steering block 3 and the inner core pulling body 4 to complete the final core pulling to the predetermined position; Mold closing stage: d. The hydraulic cylinder 1 drives the inner pull steering block 3 and the inner pull body 4 to pre-reset to the limit locking position; e. When the mold is closed, the limit drive rod 5 is inserted into the limit groove 61, and the limit slider 6 is pushed by the inclined surface to compress the elastic element 7 and disengage from the limit hole 31, thus releasing the limit; f. The inner pull shovel base 2 is inserted into the inner pull steering block 3. The inner pull steering block 3 and the inner pull body 4 are precisely reset by the inner pull shovel base 2, thus completing the mold locking.

[0033] The following will refer to Figures 1 to 7 The working principle of the present invention will be explained.

[0034] Mold opening stage (initial drawing → locking → final drawing): 1. Initial extraction: The mold begins to open, and the inner extraction shovel base 2, which is fixed in the fixed mold, cooperates with the connecting hole 32 on the inner extraction steering block 3 through its T-shaped shovel base slider 21, driving the inner extraction steering block 3 to move, and then driving the inner extraction body 4 to move through the T-shaped block 41, completing the initial separation from the product (initial core extraction).

[0035] 2. Locking: Simultaneously, the limit drive rod 5 also moves synchronously. During the initial pulling process, the front end of the limit drive rod 5 inserts into the limit groove 61 of the limit slider 6, and its first inclined part 51 and second inclined part 62 remain in contact, forcing the limit slider 6 to overcome the elastic force of the elastic element 7 and move away from the inner pulling steering block 3, so that the front end of the limit slider 6 retracts and does not interfere with the initial pulling action. When the mold opening stroke reaches the design value, the inner pulling spade base 2 is about to completely disengage from the connecting hole 32 of the inner pulling steering block 3. At this time, the limit drive rod 5 is also just completely pulled out from the limit groove 61, and the elastic force of the elastic element 7 is released instantly, pushing the limit slider 6 to slide rapidly towards the inner pulling steering block 3, and its front end is precisely inserted into the limit hole 31 of the inner pulling steering block 3 to achieve rigid mechanical locking. At this time, even if the inner pulling spade base 2 has disengaged, the inner pulling steering block 3 and the inner pulling body 4 are also firmly fixed in the current position and will not fall due to gravity.

[0036] 3. Final Pulling: Subsequently, the hydraulic cylinder 1 is activated, and its piston rod pulls the inner pulling steering block 3 through the hydraulic cylinder head 8 to continue moving. Since the inner pulling steering block 3 has been locked by the limit slider 6, the driving force of the hydraulic cylinder 1 will drive the entire locked assembly (including the inner pulling steering block 3 and the inner pulling body 4) to continue to complete the remaining core pulling stroke until the final predetermined position is reached.

[0037] Mold closing stage (pre-reset → unlock → fine reset): 1. Pre-reset: When the mold closing begins, the hydraulic cylinder 1 first reverses its drive, pushing the inner pull steering block 3 and the inner pull body 4 to move towards the forming position. When the side of the inner pull steering block 3 contacts the front end of the extended limit slider 6 again, the inner pull steering block 3 is restricted to the pre-reset position due to the obstruction of the limit slider 6. This position is the "hydraulic cylinder pre-reset to limit locking point".

[0038] 2. Unlocking: The mold continues to close, and the limiting drive rod 5 on the fixed mold side begins to insert into the limiting groove 61 of the limiting slider 6 on the moving mold side. The first inclined part 51 and the second inclined part 62 make inclined surface contact. As the mold closing depth increases, the horizontal component force generated by the inclined surface overcomes the thrust of the elastic element 7, pushing the limiting slider 6 backward, so that its front end completely exits from the limiting hole 31 of the inner pull-out turning block 3, releasing the mechanical lock on the inner pull-out turning block 3.

[0039] 3. Precision Reset: As the limit slider 6 disengages from its locked position, the inner pull-out shovel base 2 also moves synchronously, with its T-shaped shovel base slider 21 precisely inserted into the connecting hole 32 of the inner pull-out steering block 3. Under the action of the mold-closing force, the inner pull-out shovel base 2, through its high-precision drive ramp, precisely pushes and presses the inner pull-out steering block 3 and the inner pull-out main body 4 from the pre-reset position to the final molding position, completing the final precision reset. At this point, the mold is completely closed, the mold is locked, and it is ready for the next injection molding cycle.

[0040] The mechanical limiting and hydraulic cylinder-driven mechanism for the inner pull-out of the top side of the two-color injection mold of this invention significantly improves reliability: Through a purely mechanical elastic limiting mechanism, rigid position holding is provided during the "vacuum period" of power switching between the hydraulic cylinder and the inclined guide column, fundamentally eliminating the risk of the top side slider falling due to gravity, completely avoiding hydraulic cylinder damage and mold collision accidents, and greatly improving the safety of mold operation; Reduced production costs: This invention relies entirely on the mold opening and closing action for triggering, eliminating the need for additional auxiliary hydraulic cylinders, hydraulic control valves, and supporting pipelines, resulting in a more compact mold structure and a 15%-20% reduction in manufacturing costs, while also significantly reducing subsequent maintenance workload and costs; Improved reset accuracy. The system employs a tiered reset strategy of "cylinder pre-reset to limit point + inclined guide post (shovel base) final precision positioning." The limit slider provides a clear intermediate positioning benchmark, ensuring accurate insertion of the inclined guide post each time, significantly improving mold closing reset accuracy and reducing the need for manual debugging and correction. The system is also compact: the mechanical limit mechanism is integrated into the side of the inner sliding block, occupying little space and reducing the need for hydraulic components and installation space, thus improving the overall adaptability of the mold. Furthermore, the system is highly versatile: it does not rely on complex electronic or hydraulic control, operates stably and reliably, and can be widely used in various two-color / multi-color injection molds, especially suitable for molds of large and complex products such as automotive lighting and appliance housings.

[0041] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mechanical limiting and oil cylinder cooperative driving mechanism for the inner core-pulling of the top side of a two-color injection mold, comprising an oil cylinder arranged on the movable mold side, an inner-pulling turning block connected with the oil cylinder, an inner-pulling main body connected with the inner-pulling turning block, and an inner-pulling spade base arranged on the fixed mold side for driving the inner-pulling turning block and the inner-pulling main body to complete the initial-stage core-pulling and separate the inner-pulling main body from the product, characterized in that, It also includes a limiting drive rod fixed to the fixed mold side, a limiting slider slidably disposed on the moving mold side, and an elastic element acting on the limiting slider and enabling the limiting slider to move inward toward the inner pull-out turning block. The front end of the limiting drive rod is provided with a first inclined portion, and a limiting groove is formed on the limiting slider. A second inclined portion matching the first inclined portion is formed in the limiting groove. The inner pull-out turning block is provided with a limiting hole that cooperates with the limiting slider. When the mold is opened, the limiting drive rod is inserted into the limiting groove. Through the sliding cooperation of the first inclined portion and the second inclined portion, the limiting slider is brought close to the limiting hole by the elastic element. When the inner pull-out base is about to detach from the inner pull-out turning block, the limiting drive rod is pulled out from the limiting groove, and the elastic element drives the limiting slider to insert into the limiting hole, locking the inner pull-out turning block.

2. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of the two-color injection mold according to claim 1, characterized in that, The hydraulic cylinder is connected to the internal pull-out steering block via a hydraulic cylinder hanger.

3. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of the two-color injection mold according to claim 1, characterized in that, A guide block is also fixedly provided on the moving mold side. The guide block slides in cooperation with the limiting slider to guide the movement direction of the limiting slider.

4. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of the two-color injection mold according to claim 1, characterized in that, The moving mold side is provided with a limiting connecting seat, and a connecting rod is fixedly connected to the limiting connecting seat. The elastic element is a compression spring, which is sleeved on the connecting rod, with one end abutting against the limiting connecting seat and the other end abutting against the limiting slider.

5. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of a two-color injection mold according to claim 1, characterized in that, A wear-resistant plate is fixedly installed on the back of the limiting slider.

6. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of a two-color injection mold according to claim 1, characterized in that, The inner pull steering block is provided with a connecting hole, and the inner pull shovel base is connected with a shovel base slider. The shovel base slider has a T-shaped structure and slides in cooperation with the connecting hole.

7. The mechanical limiting and hydraulic cylinder coordinated drive mechanism for the inner withdrawal of the top side of a two-color injection mold according to claim 1, characterized in that, The inner drawing steering block and the inner drawing body are slidably connected by a T-shaped block, and their movement directions are different.

8. A two-color injection mold, characterized in that, The invention includes a mechanical limiting and hydraulic cylinder-driven mechanism for the inner pulling of the top side of a two-color injection mold as described in any one of claims 1 to 7.

9. A collaborative driving method based on the mechanism described in any one of claims 1 to 7, characterized in that, Includes the mold opening stage and the mold closing stage: Mold making stage: a. The inner core extraction is completed by driving the inner core extraction steering block and the inner core extraction body to complete the initial core extraction. b. At the same time, the limit drive rod moves synchronously, the limit drive rod is pulled out from the limit groove, and the elastic element pushes the limit slider to insert into the limit hole of the inner pull steering block, locking the inner pull steering block; c. The hydraulic cylinder drives the internal core pulling steering block and the internal core pulling body to complete the final core pulling to the predetermined position; Mold closing stage: d. The hydraulic cylinder drives the inner pull steering block and the inner pull main body to pre-reset to the limit locking position; e. When the mold is closed, the limit drive rod is inserted into the limit slot, and the inclined surface pushes the limit slider to compress the elastic element and disengage from the limit hole, thus releasing the limit; f. The inner pull shovel base is inserted into the inner pull steering block. The inner pull steering block and the inner pull body are precisely reset by the inner pull shovel base drive, and the mold locking is completed.

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