Self-adaptive uniform load misalignment locking ejection mechanism triggered by demolding resistance and demolding machine

Abstract

This invention relates to the field of die-casting demolding equipment technology, specifically to an adaptive load-equalizing misaligned locking ejection mechanism and demolding machine triggered by demolding resistance. The ejection mechanism includes a telescopic rod, a base, a top mold section, and an elastic section. The guide post, outer sleeve, and connecting box in the top mold section are connected by inner and outer through holes to form a sealed channel. The elastic section provides pre-tight support to keep the inner and outer through holes aligned and open. The piston can float independently axially with the demolding resistance. Based on the principle of communicating vessels, the ejector rod adaptively conforms to the casting and distributes force evenly, compensating for height differences caused by ejector rod wear. When the demolding resistance reaches the resistance threshold, the elastic section deforms, causing the guide post and outer sleeve to misalign, closing the flow channel between the inner and outer through holes. The fluid medium is transformed into a rigid hydraulic column, achieving rigid ejection of the entire casting. This effectively solves the problem of uneven force distribution on the casting caused by uneven ejector rod wear, preventing casting deformation, tearing, and chipping, ensuring damage-free demolding of die-cast parts, and improving demolding stability and product yield.

Description

Technical Field

[0001] This invention relates to the field of die-casting demolding equipment technology, specifically to an adaptive load-equalizing misaligned locking ejection mechanism and demolding machine triggered by demolding resistance. Background Technology

[0002] Die casting machines are core equipment in the field of die casting molding technology. They are used to inject molten metal into a mold under pressure and cool it into shape. After the mold is opened, an ejector mechanism is needed to complete the demolding and unloading of the casting. Existing technology ZL202322642378.9 discloses a die casting machine with automatic unloading, which achieves automatic demolding and unloading of castings through the cooperation of a pushing unit and a demolding unit. Although it solves the problems of low efficiency and easy damage to castings caused by traditional manual / robot grasping and unloading, it still does not solve the core defects of the ejector mechanism described below.

[0003] After die casting, the castings need to be demolded by an ejector mechanism. Existing die casting demolding machines often use a rigid, linked system of multiple ejector rods with fixed strokes at each ejection point. In actual demolding, the casting surfaces are uneven and vary in shape. Even if the ejector rods are initially adjusted to the appropriate ejection height, as demolding continues, the wear on the tips of the ejector rods will significantly deviate due to the differences in the casting surface shape. Some ejector rods, due to wear and shortening, cannot effectively abut at their corresponding points, causing localized stress imbalances in the casting and leading to quality defects such as tearing, chipping, and deformation. While existing visual inspection equipment can monitor the deformation status of castings in real time and immediately stop the machine for repair after detecting defects, its accuracy is limited. By the time the equipment identifies a deformation problem, a batch of deformed castings has already been produced. These castings must be re-inspected one by one to determine if the deformation is compliant; unqualified products must be scrapped.

[0004] It is evident that the ejection failure caused by uneven wear of the ejector rod in traditional rigid linkage ejection mechanisms directly leads to an increase in casting defect rate and production costs, and makes it difficult to fundamentally guarantee the non-destructive demolding and safe use of high-precision die-cast parts. Summary of the Invention

[0005] To address the technical problem of casting deformation during ejection caused by uneven wear of the ejector rod in the ejection mechanism, this invention provides an adaptive load-equalizing misalignment locking ejection mechanism triggered by demolding resistance. Furthermore, this invention also provides a demolding machine using this ejection mechanism.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An adaptive load-equalizing misaligned locking ejection mechanism triggered by demolding resistance, comprising: The telescopic rod, installed on the lower surface of the base, is used to provide demolding power; The top mold section includes at least two hollow guide pillars fixed to the upper surface of the base. An outer sleeve is slidably fitted to the outer wall of each guide pillar, and a piston is slidably fitted to the inner cavity of the outer sleeve. A push rod for pushing against the casting is fixed to the piston. All outer sleeves pass through and are fixed to the same connecting box. An external through-hole is provided in the wall of each outer sleeve, and the cavity of the connecting box communicates with the inner cavity of the outer sleeve through the external through-hole. An internal through-hole is provided on the side wall of each guide pillar, and when there is no relative movement between the guide pillar and the outer sleeve, the internal through-hole communicates with the corresponding external through-hole. The inner cavities of each outer sleeve, each guide pillar, and the connecting box cavity communicate with the external through-holes to form a closed flow channel, which is filled with a fluid medium. The elastic part, compressed between the connecting box and the base, is used to keep the guide column and the outer sleeve in a state of no relative movement before the casting is lifted, so that the closed flow channel remains open. Each piston can float axially independently according to the demolding resistance. Based on the principle of communicating vessels, the ejector rod adaptively fits the casting and distributes the load through the pressure equalization of the fluid medium. When the demolding resistance reaches the resistance threshold, axial deformation occurs, causing the guide column to move axially relative to the outer sleeve, thereby causing the two through holes to be misaligned to close the closed flow channel, and the fluid medium is converted into a rigid hydraulic column to achieve rigid ejection.

[0007] As a further improvement to the above scheme: when there is no relative movement between the guide post and the outer sleeve, the axes of all external and internal through holes are located in the same plane, and the mating external and internal through holes are coaxially aligned and connected to each other.

[0008] As a further improvement to the above scheme: the axes of the same set of mutually cooperating guide columns, outer sleeves, pistons and push rods coincide with each other.

[0009] As a further improvement to the above solution: the guide column has a two-stage stepped structure with a thicker top and a thinner bottom, and the bottom opening of the outer sleeve has a two-stage stepped opening with a larger top and a smaller bottom. The two slide and seal together to form a stop fit to prevent detachment.

[0010] As a further improvement to the above scheme: the top opening of the outer sleeve is a two-stage stepped opening that is smaller at the top and larger at the bottom. The steps of this opening form a stop step to prevent the piston from sliding out of the inner cavity of the outer sleeve.

[0011] As a further improvement to the above solution: the elastic part includes multiple support springs, which are compressed and disposed between the connecting box and the base, and are evenly distributed along the base or arranged in a corresponding matching manner with the top mold part, so as to provide the connecting box with an upward static support force and a reset power.

[0012] As a further improvement to the above scheme: multiple external through holes are opened on the cylinder wall of a single outer sleeve that mates with the connecting box. Each external through hole is evenly arranged around the circumference of the outer sleeve, and each internal through hole that mates with each external through hole is arranged on the corresponding guide post in the same way.

[0013] As a further improvement to the above scheme: multiple external through holes are opened on the cylinder wall of a single outer sleeve that mates with the connecting box. Each external through hole in the same group is evenly arranged around the circumference of the outer sleeve, and multiple groups are equidistantly arranged along the axial direction of the outer sleeve; each group of internal through holes that mate with each group of external through holes is arranged on the corresponding guide post in the same way.

[0014] As a further improvement to the above scheme: the outer through hole and the inner through hole are circular through holes of the same diameter, and their axes are perpendicular to the central axis of the outer sleeve and the guide post.

[0015] A demolding machine includes a demolding machine body and an adaptive load-equalizing misalignment locking ejection mechanism triggered by demolding resistance, used to complete the adaptive load-equalizing fit and rigid non-destructive demolding of die-cast parts.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The ejection mechanism of this invention, through its elastic part, maintains no relative displacement between the guide post and the outer sleeve when the demolding resistance does not reach the resistance threshold. This ensures that the outer through hole of the outer sleeve and the inner through hole of the guide post are always aligned and connected, thereby forming a continuous and sealed flow channel between the inner cavities of each outer sleeve, the inner cavity of the guide post, and the cavity of the connecting box. The fluid medium in the flow channel can flow freely. Based on the principle of communicating vessels, automatic pressure balancing is achieved. Even if the ejector rods wear down and shorten due to long-term use, resulting in inconsistent effective ejection lengths, each piston can still drive the corresponding ejector rod to float independently axially with the demolding resistance, automatically compensating for the height difference caused by wear, and ensuring that each ejector rod can reliably contact the corresponding point of the casting. This design eliminates problems such as incomplete ejection and force imbalance caused by wear and failure of the ejector pins. Once all ejector pins have completed adaptive fitting and the demolding resistance reaches the resistance threshold, the elastic part undergoes axial deformation, causing the guide pin to shift relative to the outer sleeve. The inner and outer through holes are misaligned to close the sealed flow channel, and the fluid medium is then transformed into an incompressible rigid hydraulic column. This connects the base, guide pin, outer sleeve, piston, and ejector pins into an integrated rigid force transmission structure, allowing the ejection force to be evenly distributed to each ejector pin. This completely avoids excessive or insufficient local force caused by uneven wear of the ejector pins, thereby eliminating quality defects such as casting scratches, chipping, and deformation, and achieving non-destructive and stable ejection of the die casting.

[0017] 2. By evenly distributing multiple external through holes around the circumference of a single outer sleeve and correspondingly setting internal through holes on the guide pillars in the same manner, the cross-sectional area of ​​fluid flow in the closed flow channel can be significantly increased, accelerating the pressure equalization speed of the fluid medium. This makes the adaptive load-sharing adjustment of the ejector rod more sensitive and efficient. At the same time, the even circumferential distribution can balance the force on the outer sleeve and the guide pillars, avoiding local stress concentration and uneven wear, and ensuring the stability of the flow channel and misalignment locking. Furthermore, by equidistantly distributing multiple sets of external through holes along the axial direction of the outer sleeve and simultaneously setting multiple sets of internal through holes on the guide pillars, the fluid flow efficiency and adaptive adjustment response speed are further improved. This also forms a multi-channel redundancy guarantee. Even if a single set of through holes experiences slight blockage or wear, the other sets can still work normally, greatly improving the reliability of the mechanism. Moreover, multiple sets of axial through holes can accommodate larger flow rates of fluid, making the ejector rod height compensation more accurate and the rigid locking more tight, significantly enhancing the adaptability of the mechanism to demolding operations of die-cast parts of different specifications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ejection mechanism.

[0019] In the diagram: 10, telescopic rod; 20, base; 30, top mold part; 31, guide post; 311, inner through hole; 32, outer sleeve; 321, outer through hole; 33, piston; 34, ejector rod; 35, connecting box; 40, elastic part; 41, support spring. Detailed Implementation

[0020] The technical solutions of the 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.

[0021] like Figure 1 As shown, this embodiment describes the overall structure, assembly relationship, initial state, three-stage workflow, reset logic and key coordination requirements of the self-adaptive load-equalizing misaligned locking ejection mechanism triggered by demolding resistance (hereinafter referred to as this ejection mechanism). This ejection mechanism is specially designed for the demolding process of large high-pressure die castings. It adopts a pure mechanical structure, without external electrical control and complex valve blocks, and can complete the entire demolding process of flexible adaptive fitting → resistance-triggered locking → rigid non-destructive ejection in sequence, ensuring that the casting is demolded with uniform force, without deformation, without puncture, and without the ejector rod 34 breaking.

[0022] This embodiment describes the overall structure, assembly relationship, initial state, three-stage workflow, reset logic, and key matching requirements of the adaptive load-equalizing misaligned locking ejection mechanism triggered by demolding resistance (hereinafter referred to as this ejection mechanism). This mechanism can be mounted on the demolding machine body to form a complete demolding machine, which is dedicated to the demolding process of die castings. It adopts a pure mechanical structure without external electrical control and complex valve blocks, and sequentially realizes the entire process of flexible adaptive load-equalizing fit → demolding resistance triggered misaligned locking → rigid non-destructive ejection, solving the problems of uneven force, wear and failure of ejector rod 34, and easy deformation of castings in traditional ejection mechanisms.

[0023] I. Overall Organization

[0024] 1. Basic driver components

[0025] The base 20 of this ejection mechanism is a rigid base plate. The bottom of the base 20 is vertically fixedly connected to the mold ejection telescopic rod 10. The telescopic rod 10 provides the axial ejection power for demolding of the entire mechanism, as well as the reset return power of the mold part 30 and the elastic part 40. The stroke and ejection power of the telescopic rod 10 are matched with the demolding requirements of large high-pressure die castings.

[0026] 2. Top mold section

[0027] Multiple guide columns 31 are vertically fixed on the base 20. The columns have a two-stage stepped structure with a large diameter at the top and a small diameter at the bottom. The top is open and the inside is a through column cavity.

[0028] Each guide post 31 has a coaxially sealed sliding fit with an outer sleeve 32 at its top. The bottom opening of the outer sleeve 32 is a two-stage stepped opening that is larger at the top and smaller at the bottom. It is coaxially sleeved and slidably sealed with the two-stage stepped structure of the guide post 31, which restricts the radial movement of the outer sleeve 32 and prevents it from slipping off the guide post 31.

[0029] The top opening of the outer sleeve 32 is a two-stage stepped opening, with the smaller opening at the top and the larger opening at the bottom. The smaller diameter section is precisely fitted with the outer diameter of the push rod 34, while the larger diameter section has a piston 33 that is coaxially sealed and slidably fitted inside. The upper end face of the piston 33 is fixedly connected to the bottom end of the push rod 34. The piston 33 can slide freely along the inner wall of the outer sleeve 32 in the axial direction and will not come out of the top opening of the outer sleeve 32.

[0030] All outer sleeves 32 are vertically inserted and sealed inside the connecting box 35, and are fixedly connected to each other. The connecting box 35 is a sealed hollow cavity. Each outer sleeve 32 is located at the same axial position inside the connecting box 35 and is provided with an external through hole 321. The cavity of the connecting box 35 is connected to the cavity of the corresponding outer sleeve 32 through the external through hole 321.

[0031] The guide post 31 has an inner through hole 311, which is coaxially connected with the outer through hole 321 under static conditions, so that the column cavity of each guide post 31, the cylinder cavity of each outer sleeve 32, and the box cavity of the connecting box 35 form a closed flow channel.

[0032] Through-hole arrangement requirements: Multiple external through-holes 321 are provided on the cylinder wall of a single outer sleeve 32 that mates with the connecting box 35. Each external through-hole 321 is evenly arranged around the circumference of the outer sleeve 32, and the mating internal through-holes 311 are arranged on the corresponding guide post 31 in the same manner. Multiple sets of external through-holes 321 can be arranged equidistantly along the axial direction of the outer sleeve 32, and each set of internal through-holes 311 is arranged correspondingly in the same manner. The external through-holes 321 and the internal through-holes 311 are circular through-holes with the same diameter, and their axes are perpendicular to the central axis of the outer sleeve 32 and the guide post 31. When there is no relative movement between the guide post 31 and the outer sleeve 32, the axes of all internal and external through-holes 321 are located in the same plane, and the mating internal and external through-holes 321 are coaxially aligned and connected to each other.

[0033] Top mold 30 layout requirements: The top mold 30 shall be arranged according to the shape contour, projected area and demolding force requirements of the casting, so that each guide post 31 is evenly distributed on the base 20; or according to the key stress area, wall thickness distribution and easily deformable position of the casting, the top mold 30 shall be arranged in a matrix, symmetrical or random form according to the preset ejection point position, so as to ensure that the casting is subjected to balanced force and no local overload during the ejection process, and avoid the casting deformation, cracking or puncture caused by uneven load at the ejection point.

[0034] 3. Elastic part

[0035] Multiple circular cross-section support springs 41 are uniformly compressed and assembled between the lower surface of the connecting box 35 and the upper surface of the base 20. The support springs 41 are vertically arranged and have uniform preload, providing the connecting box 35 with upward static support force and reset power.

[0036] The elastic part 40 is arranged in a corresponding and matching manner with the top mold part 30. Each support spring 41 is evenly distributed along the base 20, or is arranged in a complementary manner with the top mold part 30, either in the same position or in a staggered position. This ensures that the connecting box 35 is subjected to stable force in the initial state and during operation, without tilting or jamming, and guarantees that each through hole is synchronously aligned and synchronously staggered and locked, thereby achieving force balance and consistent action across the entire ejection plane.

[0037] When the demolding resistance does not reach the resistance threshold, the elastic part 40 keeps the guide post 31 and the outer sleeve 32 without relative movement, so that the sealed flow channel is open; when the demolding resistance reaches the resistance threshold, it generates axial deformation, causing the guide post 31 to be axially displaced relative to the outer sleeve 32, and the inner and outer through holes 321 are misaligned to close the sealed flow channel.

[0038] 4. Fluid medium

[0039] The sealed flow channel formed by the outer sleeve 32 cylinder cavity, the guide column 31 column cavity, and the connecting box 35 box cavity is completely filled with die-casting special high-temperature anti-wear hydraulic oil to ensure the fluid's incompressible characteristics.

[0040] II. Initial State

[0041] 1. The sum of the static elastic forces of the elastic part 40 is greater than the sum of the total weight of its upper support member and the sliding friction force of each piston 33 relative to the outer sleeve 32, thereby ensuring the continuous conduction of the connecting channel during the flexible adaptive bonding stage.

[0042] 2. The upper stepped surface of the guide post 31 abuts against the bottom stepped surface of the outer sleeve 32. The support spring 41 pushes the connecting box 35 to the initial high position. The inner through hole 311 on the guide post 31 is completely coaxially aligned with the outer through hole 321 of the outer sleeve 32, and the connecting channel is fully connected.

[0043] 3. All push rods 34 extend to the same length, the piston 33 is in the initial position inside the outer sleeve 32, and the mechanism is in the standby state for ejection.

[0044] III. Stage Actions

[0045] The entire demolding process of the mechanism is divided into three continuous stages: "flexible adaptive fitting → resistance-triggered locking → rigid non-destructive ejection". The action is without delay and without external intervention, and is completely triggered by the physical resistance of demolding.

[0046] (I) Phase 1: Flexible Adaptive Fitting

[0047] 1. Push-out start

[0048] The telescopic rod 10 pushes the base 20 upward at a uniform speed. The top of the push rod 34 is the first to contact the surface of the die casting. At this time, due to uneven cooling and shrinkage of the casting and the surface height difference due to the mold processing tolerance, the demolding resistance borne by each push rod 34 is different.

[0049] 2. Adaptive height adjustment

[0050] Because the outer through hole 321 and the inner through hole 311 are coaxially connected, the hydraulic oil in the closed flow channel can flow freely: the push rod 34, which is subject to greater resistance, drives the piston 33 to slide slightly downward in the outer sleeve 32, squeezing the hydraulic oil in the cavity; the push rod 34, which is subject to less resistance or is suspended, allows the piston 33 to slide upward under the thrust of the hydraulic oil, and the push rod 34 automatically extends to compensate for the height.

[0051] 3. Complete load equalization

[0052] Hydraulic oil achieves automatic pressure balance in each chamber through a closed flow channel, and all push rods 34 quickly complete height self-adaptive adjustment. The top of the push rod 34 achieves full-area flexible fit with the surface of the casting, without local overload or suspension, achieving a completely uniform load state.

[0053] 4. Maintain state

[0054] During this stage, the total demolding resistance is less than the total static elastic force of the springs. There is no axial displacement between the guide post 31 and the outer sleeve 32. The through holes remain aligned, the sealed flow channel remains open, and the flexible fit is stable.

[0055] (II) Stage Two: Resistance Triggered Lockout

[0056] 1. Breaking through the resistance threshold

[0057] After all the ejector rods 34 are fully in contact with the casting, the telescopic rod 10 continues to apply ejection force, and the demolding resistance rises sharply, instantly exceeding the resistance threshold set by the pre-tension of the support spring 41.

[0058] The resistance threshold of this ejection mechanism is uniformly set by the sum of the static support forces of the support springs 41 in the elastic part 40. When setting this threshold, two core conditions must be met: First, the sum of the static support forces of the support springs 41 must be configured to be greater than the sum of the total weight of the upper support components of the mechanism and the sliding friction force between the piston 33 and the outer sleeve 32. This ensures that during the adaptive fitting stage of the ejector rod 34, the connecting box 35 maintains its initial high position, the closed flow channel remains continuously open, allowing the ejector rod 34 to freely compensate for wear height differences and complete the uniform loading and fitting of the casting across the entire area. Second, this resistance threshold is set to be slightly greater than the sum of the demolding resistances before the ejector rod 34 fully fits the casting. Furthermore, the ejection force is less than that required for normal demolding of the die casting. This ensures that only after all ejector pins 34 have completed wear compensation and fully adhered to the casting surface will the continuously applied ejection force cause the demolding resistance to exceed the resistance threshold. This triggers the relative misalignment of the guide pin 31 and the outer sleeve 32, the flow channel locks, and the system switches to rigid ejection mode. This avoids premature locking due to an excessively low resistance threshold before adaptive compensation is completed, and also prevents locking from being triggered due to an excessively high resistance threshold. Ultimately, this achieves precise control by "first adaptively correcting the wear deviation of the ejector pins 34, and then rigidly and uniformly ejecting," completely solving the casting deformation problem caused by uneven wear of the ejector pins 34.

[0059] 2. Axial relative displacement

[0060] The base 20 drives the guide column 31 to overcome the elastic force of the support spring 41 and generate a slight axial displacement upward, causing the guide column 31 and the outer sleeve 32 to be axially misaligned.

[0061] 3. Physical locking of flow channels

[0062] The outer through hole 321 and the inner through hole 311 are completely misaligned. The inner wall of the outer sleeve 32 and the outer wall of the guide column 31 completely block the through hole, and each chamber forms an independent sealed space, transforming the fluid hydraulic oil into a non-flowing rigid hydraulic column.

[0063] (III) Stage 3: Rigid and lossless ejection

[0064] 1. Forming a rigid force transmission body

[0065] The hydraulic oil in the sealed chamber is an incompressible medium. The rigid base 20, guide column 31, outer sleeve 32, piston 33, and push rod 34 are connected into an integrated rigid structure through a rigid hydraulic column, and there is no relative displacement or power loss among the components.

[0066] 2. Perform non-destructive ejection

[0067] The ejection thrust of the telescopic rod 10 is evenly transmitted to each ejector rod 34 through the integrated rigid structure. Each ejector rod 34 is subjected to completely equal force, which smoothly and synchronously ejects the casting from the mold cavity, completely avoiding problems such as casting penetration, overall deformation, and ejector rod 34 breakage.

[0068] 3. Complete the ejection process.

[0069] After the casting has completely detached from the mold cavity, the demolding resistance disappears, and the mechanism enters the reset process: (1) Drive Reset The telescopic rod 10 drives the base 20 to return downwards, the pushing force disappears, and the guide column 31 moves downwards synchronously with the base 20.

[0070] (2) Elastic reset

[0071] The support spring 41 of the elastic part 40 releases the pre-tight elastic force, pushing the connecting box 35 and the outer sleeve 32 to return to their original position until the upper stepped surface of the guide post 31 and the bottom opening of the outer sleeve 32 re-abut against each other.

[0072] (3) Flow channel opening and pressure relief

[0073] The outer sleeve 32 and the guide post 31 return to their initial axial positions, the outer through hole 321 and the inner through hole 311 are re-aligned coaxially, the sealed chamber is depressurized, and the hydraulic oil returns to a free-flowing state.

[0074] (4) Restore the initial state

[0075] The ejector rod 34, piston 33, and outer sleeve 32 all return to their initial standby positions, the mechanism completes its reset, and is ready for the next die-casting demolding operation, and can enter the cyclic working mode.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A demolding resistance triggered self-adapting load sharing misalignment lockout ejection mechanism, characterized in that, include: Telescopic rod (10), installed on the lower surface of base 20 (20), is used to provide demolding power; The top mold section (30) includes at least two hollow guide pillars (31) fixed to the upper surface of the base 20 (20). The outer wall of the guide pillars (31) is sealed and slidably fitted with an outer sleeve (32). The inner cavity of the outer sleeve (32) is sealed and slidably fitted with a piston (33). A push rod (34) for pushing against the casting is fixedly connected to the piston (33). All the outer sleeves (32) pass through and are fixed to the same connecting box (35). The outer sleeve (32) has an external through hole (321) on its wall. The connecting box (35) The box cavity is connected to the inner cavity of the outer sleeve (32) through the outer through hole (321); the guide post (31) has an inner through hole (311) on its side wall. When there is no relative movement between the guide post (31) and the outer sleeve (32), the inner through hole (311) is connected to the corresponding outer through hole (321); the inner cavity of each outer sleeve (32), the inner cavity of each guide post (31), and the box cavity of the connecting box (35) are connected to the outer through hole (321) through the inner through hole (311) to form a closed flow channel, which is filled with a fluid medium; The elastic part (40) is compressed between the connecting box (35) and the base 20 (20) to keep the guide column (31) and the outer sleeve (32) in a state of no relative movement before the casting is lifted, so that the closed flow channel remains open. Each piston (33) can float axially independently with the demolding resistance. Based on the principle of communicating vessels, the ejector rod (34) is adaptively fitted to the casting and the load is evenly distributed through the pressure equalization of the fluid medium. When the demolding resistance reaches the resistance threshold, axial deformation is generated, so that the guide column (31) is axially displaced relative to the outer sleeve (32), thereby causing the two through holes to be misaligned to close the closed flow channel, so that the fluid medium is converted into a rigid hydraulic column to achieve rigid ejection.

2. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, When there is no relative movement between the guide post (31) and the outer sleeve (32), the axes of all the outer through holes (321) and the inner through holes (311) are located in the same plane, and the mating outer through holes (321) and inner through holes (311) are coaxially aligned and connected to each other.

3. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, The axes of the guide column (31), outer sleeve (32), piston (33) and push rod (34) that cooperate with each other in the same group coincide with each other.

4. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, The guide post (31) has a two-stage stepped structure with a thicker top and a thinner bottom, and the bottom opening of the outer sleeve (32) has a two-stage stepped opening with a larger top and a smaller bottom. The two slide and seal together to form a stop fit to prevent detachment.

5. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, The top opening of the outer sleeve (32) is a two-stage stepped opening that is smaller at the top and larger at the bottom. The steps of this opening form a stop step to prevent the piston (33) from sliding out of the inner cavity of the outer sleeve (32).

6. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, The elastic part (40) includes multiple support springs (41), which are compressed between the connecting box (35) and the base 20 (20) and are evenly distributed along the base 20 (20) or matched with the top mold part (30) to provide upward static support force and reset power for the connecting box (35).

7. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, Multiple external through holes (321) are provided on the cylinder wall of a single outer sleeve (32) that cooperates with the connecting box (35). Each external through hole (321) is evenly arranged around the outer sleeve (32). Each internal through hole (311) that cooperates with each external through hole (321) is arranged on the corresponding guide post (31) in the same way.

8. The self-adaptive load-sharing misalignment locking ejection mechanism triggered by demolding resistance according to claim 1, characterized in that, Multiple external through holes (321) are provided on the cylinder wall of a single outer sleeve (32) that mates with the connecting box (35). In the same group, each external through hole (321) is evenly arranged around the circumference of the outer sleeve (32), and multiple groups are arranged at equal intervals along the axial direction of the outer sleeve (32). Each group of internal through holes (311) that mates with each group of external through holes (321) is arranged on the corresponding guide post (31) in the same way.

9. A demolding resistance-triggered adaptive load-equalizing misaligned locking ejection mechanism according to claim 7 or 8, characterized in that, The outer through hole (321) and the inner through hole (311) are circular through holes with the same diameter, and their axes are perpendicular to the central axis of the outer sleeve (32) and the guide post (31).

10. A demolding machine, characterized in that, It includes a demolding machine body and an adaptive load-equalizing misalignment locking ejection mechanism triggered by demolding resistance as described in any one of claims 1-9, for completing adaptive load-equalizing bonding and rigid non-destructive demolding of the die-casting part.

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