Die-casting die demolding device

Abstract

The invention belongs to the technical field of die casting, and discloses a die-casting die demolding device which comprises a die-casting machine tool and further comprises an injection mechanism. According to the technical scheme, a demolding ejector rod, an expansion assembly, a hydraulic assembly, a fixing assembly and a communicating groove are arranged; when the hydraulic cylinder drives the whole movable mold to move towards one side for demolding, the expansion assembly can be limited by the inner diameters of the movable mold and the positioning assembly to deflect and contract till one side of the expansion assembly makes contact with the surface of one side of a die casting in the movable mold, and then the expansion assembly is released from limited extrusion and contraction; due to the fact that one side of the hydraulic drive assembly is extruded, hydraulic oil in an inner cavity can be guided into the fixing assembly through a communicating groove, the other side of the expansion assembly is blocked and fixed through movement of the end, finally, the expansion assembly can enlarge the area of the end of the demolding ejector rod, the stress face is increased, and scratches are avoided; and the expansion assembly is telescopic, so that demolding of various types of molds can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of die casting, and specifically relates to a demoulding device for a die-casting mold. Background Technique

[0002] The demoulding device of a die-casting mold is a key component to ensure the smooth separation of the formed casting from the mold. Its design directly affects production efficiency, casting quality, and mold life. The common demoulding methods are as follows:

[0003] 1. Ejector Pin Demoulding

[0004] Principle: The casting is directly ejected through an ejector pin, an ejector tube, or an ejector block.

[0005] Applicable Scenarios: Castings with simple structures and regular shapes;

[0006] Advantages: Low cost, easy to machine and maintain;

[0007] Disadvantages: Uneven ejection force distribution may cause casting deformation, and multiple ejector pins are required for complex shapes.

[0008] 2. Stripper Plate Demoulding

[0009] Principle: The casting is uniformly pushed by an integral stripper plate.

[0010] Applicable Scenarios: Large, thin-walled, or deep-cavity castings;

[0011] Advantages: Uniform thrust, reducing the risk of casting deformation;

[0012] Disadvantages: Complex structure, requiring a guiding mechanism.

[0013] 3. Compressed Air Demoulding

[0014] Principle: Compressed air is injected through air holes to assist in separating the casting.

[0015] Applicable Scenarios: Castings with deep holes, complex internal cavities, or large clamping forces;

[0016] Advantages: Non-contact separation, reducing casting damage;

[0017] Disadvantages: Sealing design is required, and the control difficulty is relatively high.

[0018] Hydraulic Demoulding

[0019] Principle: A hydraulic cylinder is used to push the demoulding element.

[0020] Applicable Scenarios: Large or high-clamping force castings;

[0021] Advantages: Large and controllable thrust, suitable for automated production;

[0022] Disadvantages: High cost and complex maintenance.

[0023] From the comparison of the above different demoulding methods, it can be concluded that the conventional ejector pin demoulding method is more cost-saving. However, its stress point is small, and deformation will occur when pushing the die-casting part. Therefore, multiple ejector pins need to be arranged to achieve uniform force dispersion. When designing for different molds, the design is complex and cumbersome, and mold scratches will be caused during the pushing process, affecting the overall aesthetics of the die-casting part. Therefore, it needs to be improved. Summary of the Invention

[0024] To solve the problems raised in the above background technology, the present invention provides a demoulding device for a die-casting mold, which has the advantages of avoiding scratches and being able to cope with the demoulding of multiple molds.

[0025] To achieve the above object, the present invention provides the following technical solution: A demoulding device for a die-casting mold, including a die-casting machine tool, further including: a shot mechanism, the shot mechanism is arranged on one side of the top of the die-casting machine tool; a fixed mold, the fixed mold is arranged in the inner cavity of the top of the die-casting machine tool, and the fixed mold is communicated with the end of the shot mechanism; a movable mold, the movable mold is slidably connected to the inner cavity of the top of the die-casting machine tool, and one side of the movable mold is fixedly connected to the output end of a hydraulic cylinder arranged in the inner cavity of the top of the die-casting machine tool; a support plate, the support plate is arranged on the top inner cavity of the die-casting machine tool and is located between the movable mold and the hydraulic cylinder, and a demoulding mechanism is arranged on one side of the support plate; wherein, the demoulding mechanism includes a demoulding ejector pin fixedly installed on one side of the support plate, an expansion assembly is hinged to the end of the demoulding ejector pin, a hydraulic component is arranged at the end of the demoulding ejector pin, fixed components are arranged on both sides of one end of the hydraulic component inside the demoulding ejector pin, and the hydraulic component and the fixed components are communicated through a communication groove.

[0026] Preferably, the expansion assembly includes an expansion plate group, a mounting seat, an air cavity and a top support piston rod;

[0027] The mounting seat is arranged on the surface of the end of the demoulding ejector pin, the expansion plate group is movably sleeved inside the mounting seat, the air cavity is opened inside the expansion plate group, and the air cavity is located inside the inner end shaft of the expansion plate group, and the top support piston rod is movably installed on both sides of the inner cavity of the air cavity.

[0028] Preferably, the expansion plate group includes a mounting plate, a telescopic rod, a telescopic plate and a first spring;

[0029] The mounting plate is movably sleeved inside the expansion plate group, the telescopic rod is arranged inside the mounting plate, the telescopic plate is arranged at the output end of the telescopic rod, and the telescopic plate is elastically connected to the mounting plate through the first spring.

[0030] Preferably, the hydraulic component includes a first hydraulic cavity, a top push piston rod and a second spring;

[0031] The first hydraulic cavity is opened at the end of the demolding ejector rod. The ejecting piston rod is movably installed inside the first hydraulic cavity, and the ejecting piston rod is elastically connected to the inner wall of the first hydraulic cavity through a second spring.

[0032] Preferably, the fixing assembly includes a second hydraulic cavity, a hydraulic piston rod, and a fixing ring.

[0033] The second hydraulic cavity is opened inside the demolding ejector rod, and the second hydraulic cavity is located outside the communication groove. The second hydraulic cavity is communicated with the first hydraulic cavity through the communication groove. The hydraulic piston rod is movably installed inside the second hydraulic cavity, and the fixing ring is arranged at the end of the hydraulic piston rod.

[0034] Preferably, a positioning assembly is arranged inside the moving mold. The positioning assembly includes a positioning baffle, a cylinder, a fixing bracket, and a third spring.

[0035] The positioning baffle is movably installed inside the moving mold. The cylinder is arranged inside the moving mold and is located at the outer end of the positioning baffle. The fixing bracket is movably sleeved on the surface of the cylinder. The inner end of one side of the fixing bracket is inserted into the two sides inside the positioning baffle. The other side of the fixing bracket extends to the surface of the moving mold, and the inner end of the other side of the fixing bracket is designed in a bevel shape. The outer side of the fixing bracket is elastically connected to the inside of the moving mold through a third spring.

[0036] Preferably, valve flaps are arranged at the end of the inner groove of the positioning baffle. The number of the valve flaps is two, and both valve flaps are made of rubber.

[0037] Preferably, a sealing assembly is arranged in the inner groove on one side of the moving mold. The sealing assembly includes a movable block, a driving piston rod, a sealing blocking block, and a limiting member.

[0038] The movable block is movably installed in the inner groove on one side of the moving mold. The driving piston rod is movably installed inside the movable block. The sealing blocking block is arranged at the end of the driving piston rod. The limiting member is arranged at the outer end of the sealing blocking block, and the outer end of the limiting member is slidably connected to the inner wall of the positioning baffle. One end of the movable block is designed in a bevel shape.

[0039] Preferably, a limiting hydraulic assembly is arranged on the inner wall of the moving mold and is located outside the movable block. The limiting hydraulic assembly includes a limiting hydraulic cavity, a limiting piston rod, and a tension spring.

[0040] The limiting hydraulic cavity is opened inside the moving mold, and the limiting hydraulic cavity is located outside the movable block. The limiting piston rod is movably installed inside the limiting hydraulic cavity. The inner end of the limiting piston rod is fixedly connected to the surface of the movable block. The limiting piston rod is elastically connected to the inner wall of the limiting hydraulic cavity through a tension spring.

[0041] Preferably, a communicating pipe is fixedly connected to the outside of one end of the movable block, and the other end of the communicating pipe is communicated with the limiting liquid cavity.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The above technical solution sets a demolding ejector rod, an expansion assembly, a hydraulic assembly, a fixing assembly and a communicating groove; when the moving die is driven by a hydraulic cylinder to move integrally to one side for demolding, the expansion assembly can be deflected and contracted due to the inner diameter limitation of the moving die and the positioning assembly until one side of the expansion assembly contacts the surface of one side of the die casting in the moving die, and then the expansion assembly will be released from the restriction and extruded and contracted, so that the air pressure in the expansion assembly is released and deflected and reset. Since one side of the hydraulic assembly is extruded, the hydraulic oil in the inner cavity will be introduced into the fixing assembly through the communicating groove, so that the end moves to block and fix the other side of the expansion assembly. Finally, the expansion assembly will expand the end area of the demolding ejector rod, increase the stress surface and avoid scratches, and the telescopic performance of the expansion assembly can meet the demolding of various types of dies.

[0044] The present invention sets a positioning baffle, a fixing bracket and a third spring. Due to the elastic force of the third spring, the fixing bracket can be pushed to move towards each other, so that the inner end of one side of the fixing bracket is inserted into the positioning baffle to fix the whole positioning baffle, avoiding changes during die casting in the fixed die and the moving die by the injection mechanism, and achieving a good stabilizing effect. When the hydraulic cylinder drives the moving die to demold to one side, the end of the demolding mechanism will push the inclined surface of the inner end of the other side of the fixing bracket, causing the fixing bracket to move away from each other, and the clamping and fixing of the whole positioning baffle can be smoothly released.

[0045] The present invention sets a valve flap, a sealing assembly and a limiting hydraulic assembly. Through the power action of the limiting hydraulic assembly, the sealing assembly can be made to fit together to block and fix one side of the valve flap, thereby avoiding the plastic fluid from squeezing and pushing the valve flap to open during die casting, achieving a good sealing effect. Then, when the hydraulic cylinder drives the moving die to demold, the end of the demolding mechanism will squeeze and push the inclined surface of the end of the sealing assembly, and squeeze and push the whole sealing assembly and the limiting hydraulic assembly to move away from each other. Then, the hydraulic oil in the limiting hydraulic assembly will be introduced into the output end of the sealing assembly through the communicating pipe, so that the output end of the sealing assembly drives the whole positioning assembly to move to one side, creating a space between the positioning assembly and the die casting for the end of the demolding mechanism to turn over. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic structural diagram of the present invention;

[0047] Figure 2 is a partial cross-sectional structural diagram of the die casting machine of the present invention;

[0048] Figure 3 isFigure 2 Schematic diagram of the enlarged local structure at position A

[0049] Figure 4 Schematic diagram of the structure of the demolding ejector rod of the present invention

[0050] Figure 5 Cross-sectional structure schematic diagram of the positioning baffle of the present invention

[0051] Figure 6 is Figure 5 Schematic diagram of the enlarged local structure at position B

[0052] Figure 7 Cross-sectional structure schematic diagram of the fixed bracket of the present invention

[0053] Figure 8 is Figure 7 Schematic diagram of the enlarged local structure at position C

[0054] Figure 9 Schematic diagram of the structure of the movable block of the present invention

[0055] Figure 10 Partial structure schematic diagram of the demolding ejector rod of the present invention

[0056] Figure 11 Partial cross-sectional structure schematic diagram of the demolding mechanism of the present invention

[0057] Figure 12 is Figure 11 Schematic diagram of the enlarged local structure at position D

[0058] Figure 13 is Figure 11 Schematic diagram of the enlarged local structure at position E

[0059] In the figure: 1, die-casting machine tool; 2, injection mechanism; 3, fixed die; 4, movable die; 5, hydraulic cylinder; 6, support plate; 7, demoulding mechanism; 701, demoulding ejector rod; 702, expansion assembly; 7021, expansion plate group; 70211, mounting plate; 70212, telescopic rod; 70213, telescopic plate; 70214, first spring; 7022, mounting seat; 7023, air chamber; 7024, top support piston rod; 703, hydraulic component; 7031, first hydraulic chamber; 7032, top moving piston rod; 7033, second spring; 704, fixing component; 7041, second hydraulic chamber; 7042, hydraulic piston rod; 7043, fixing ring; 705, communication groove; 8, positioning component; 801, positioning baffle; 802, cylinder; 803, fixed fixture; 804, third spring; 9, valve flap; 10, sealing component; 101, movable block; 102, driving piston rod; 103, sealing and blocking block; 104, limiting part; 11, limiting hydraulic component; 1101, limiting hydraulic chamber; 1102, limiting piston rod; 1103, tension spring; 12, connecting pipe. Detailed implementation manner

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0061] As Figures 1 to 13 shown, the present invention provides a die-casting mold demoulding device, including a die-casting machine tool 1, and further including: an injection mechanism 2, the injection mechanism 2 is arranged on one side of the top of the die-casting machine tool 1; a fixed die 3, the fixed die 3 is arranged in the inner cavity of the top of the die-casting machine tool 1, and the fixed die 3 is communicated with the end of the injection mechanism 2; a movable die 4, the movable die 4 is slidably connected to the inner cavity of the top of the die-casting machine tool 1, and one side of the movable die 4 is fixedly connected to the output end of a hydraulic cylinder 5 arranged in the inner cavity of the top of the die-casting machine tool 1; a support plate 6, the support plate 6 is arranged on the top of the inner cavity of the die-casting machine tool 1 and is located between the movable die 4 and the hydraulic cylinder 5, and a demoulding mechanism 7 is arranged on one side of the support plate 6; wherein, the demoulding mechanism 7 includes a demoulding ejector rod 701 fixedly installed on one side of the support plate 6, an expansion assembly 702 is hinged to the end of the demoulding ejector rod 701, a hydraulic component 703 is arranged at the end of the demoulding ejector rod 701, fixing components 704 are arranged on both sides of one end of the hydraulic component 703 inside the demoulding ejector rod 701, and the hydraulic component 703 and the fixing components 704 are connected and communicated through a communication groove 705.

[0062] By starting the hydraulic cylinder 5 to drive the moving die 4 to move to one side, the inner cavity of the moving die 4 can squeeze and contract the expansion component 702, and then the demoulding ejector rod 701 and the expansion component 702 as a whole can smoothly enter the inner cavity of the moving die 4, so that the hydraulic component 703 at the end of the demoulding ejector rod 701 contacts the die-casting part, and when the hydraulic component 703 is squeezed, the fixing component 704 can block and fix one side of the expansion component 702 that is released and expanded.

[0063] As Figure 13 shown, the expansion component 702 includes an expansion plate group 7021, a mounting seat 7022, an air cavity 7023, and a top support piston rod 7024;

[0064] The mounting seat 7022 is arranged on the end surface of the demoulding ejector rod 701, the expansion plate group 7021 is movably sleeved inside the mounting seat 7022, the air cavity 7023 is opened inside the expansion plate group 7021, and the air cavity 7023 is located inside the inner end shaft of the expansion plate group 7021. The top support piston rod 7024 is movably installed on both sides of the inner cavity of the air cavity 7023.

[0065] Adopting the above scheme: by providing the air cavity 7023, the inside of the air cavity 7023 is filled with gas and in a sealed state at this time. Therefore, the two air cavities 7023 can push and center the two sides of the inner end shaft of the expansion plate group 7021.

[0066] As Figure 11 shown, the expansion plate group 7021 includes a mounting plate 70211, a telescopic rod 70212, a telescopic plate 70213, and a first spring 70214;

[0067] The mounting plate 70211 is movably sleeved inside the expansion plate group 7021, the telescopic rod 70212 is arranged inside the mounting plate 70211, the telescopic plate 70213 is arranged at the output end of the telescopic rod 70212, and the telescopic plate 70213 is elastically connected to the mounting plate 70211 through the first spring 70214.

[0068] Adopting the above scheme: by providing the telescopic rod 70212 and the first spring 70214, due to the elastic force of the first spring 70214, the telescopic plate 70213 can be pushed to extend outward, and when the end of the telescopic plate 70213 is squeezed, it will contract. The telescopic rod 70212 can limit the telescopic movement of the telescopic plate 70213.

[0069] As Figure 11 shown, the hydraulic component 703 includes a first hydraulic cavity 7031, a top moving piston rod 7032, and a second spring 7033;

[0070] The first hydraulic cavity 7031 is opened at the end of the demolding ejector rod 701. The ejecting piston rod 7032 is movably installed in the inner cavity of the first hydraulic cavity 7031. The ejecting piston rod 7032 is elastically connected to the inner wall of the first hydraulic cavity 7031 through a second spring 7033.

[0071] With the above solution: Due to the elastic force of the second spring 7033, the ejecting piston rod 7032 can be pushed to extend to one side, and a gap will be smoothly generated in the inner cavity of the first hydraulic cavity 7031 to store hydraulic oil.

[0072] As Figure 11 and Figure 12 shown, the fixing assembly 704 includes a second hydraulic cavity 7041, a hydraulic piston rod 7042, and a fixing ring 7043;

[0073] The second hydraulic cavity 7041 is opened inside the demolding ejector rod 701, and the second hydraulic cavity 7041 is located outside the communication groove 705. The second hydraulic cavity 7041 is communicated with the first hydraulic cavity 7031 through the communication groove 705. The hydraulic piston rod 7042 is movably installed in the inner cavity of the second hydraulic cavity 7041. The fixing ring 7043 is arranged at the end of the hydraulic piston rod 7042.

[0074] With the above solution: By providing the fixing ring 7043, when the ejecting piston rod 7032 is compressed and pushed into the first hydraulic cavity 7031 by the die-casting part, the hydraulic oil in the inner cavity of the first hydraulic cavity 7031 will be introduced into the second hydraulic cavity 7041 through the communication groove 705, so as to push the hydraulic piston rod 7042 and the fixing ring 7043 to move to one side, and the fixing ring 7043 blocks and fixes one side of the expansion plate group 7021.

[0075] As Figure 8 shown, a positioning assembly 8 is arranged inside the moving die 4. The positioning assembly 8 includes a positioning baffle 801, a cylinder 802, a fixing bracket 803, and a third spring 804;

[0076] The positioning baffle 801 is movably installed in the inner cavity of the moving die 4. The cylinder 802 is arranged inside the moving die 4 and is located at the outer end of the positioning baffle 801. The fixing bracket 803 is movably sleeved on the surface of the cylinder 802. The inner end of one side of the fixing bracket 803 is inserted into both sides of the positioning baffle 801. The other side of the fixing bracket 803 extends to the surface of the moving die 4, and the inner end of the other side of the fixing bracket 803 is designed in a bevel shape. The outside of the fixing bracket 803 is elastically connected to the inside of the moving die 4 through a third spring 804.

[0077] Adopt the above solution: By providing a fixed holder 803, the elastic force of the third spring 804 can push the fixed holder 803 to move towards each other along the surface of the cylinder 802, so that the inner ends of the fixed holder 803 can be smoothly inserted into the two sides inside the positioning baffle 801, thereby clamping and fixing the whole positioning baffle 801. The size and shape of the positioning baffle 801 are not fixed and can be designed according to the actual situation.

[0078] As Figure 3 and Figure 6 shown, valve flaps 9 are arranged at the ends of the inner groove of the positioning baffle 801. The number of valve flaps 9 is two, and both valve flaps 9 are made of rubber.

[0079] Adopt the above solution: By providing valve flaps 9, since rubber has a good sealing effect, the inner groove of the positioning baffle 801 can be blocked and sealed.

[0080] As Figure 6 shown, a sealing assembly 10 is arranged in the inner groove on one side of the moving die 4. The sealing assembly 10 includes a movable block 101, a driving piston rod 102, a sealing blocking block 103 and a limiting member 104;

[0081] The movable block 101 is movably installed in the inner groove on one side of the moving die 4. The driving piston rod 102 is movably installed in the inner cavity of the movable block 101. The sealing blocking block 103 is arranged at the end of the driving piston rod 102. The limiting member 104 is arranged at the outer end of the sealing blocking block 103, and the outer end of the limiting member 104 is slidably connected to the inner wall of the positioning baffle 801. One end of the movable block 101 is designed in an inclined surface type.

[0082] Adopt the above solution: Through the design of the limiting member 104, the sealing blocking block 103 can be slidably and limitedly installed inside the cylinder 802 and is located on one side of the valve flap 9. When the sealing blocking blocks 103 move towards each other and are fixed, they can block one side of the valve flap 9.

[0083] As Figure 6 shown, a limiting hydraulic component 11 is arranged on the inner wall of the moving die 4 and is located outside the movable block 101. The limiting hydraulic component 11 includes a limiting hydraulic cavity 1101, a limiting piston rod 1102 and a tension spring 1103;

[0084] The limiting hydraulic cavity 1101 is opened inside the moving die 4 and is located outside the movable block 101. The limiting piston rod 1102 is movably installed in the inner cavity of the limiting hydraulic cavity 1101. The inner end of the limiting piston rod 1102 is fixedly connected to the surface of the movable block 101. The limiting piston rod 1102 is elastically connected to the inner wall of the limiting hydraulic cavity 1101 through the tension spring 1103. Due to the pulling force of the tension spring 1103, the whole limiting piston rod 1102 and the sealing assembly 10 can be pulled to move towards each other.

[0085] like Figure 6 As shown, a connecting pipe 12 is fixedly connected to the outer side of one end of the movable block 101 , and the other end of the connecting pipe 12 is connected to the limiting liquid chamber 1101 .

[0086] The above scheme is adopted: by providing a connecting pipe 12, when the inclined surface at one end of the movable block 101 is pushed by the demolding ejector rod 701 to move in opposite directions, the limiting piston rod 1102 can push the hydraulic oil inside the limiting liquid chamber 1101 through the connecting pipe 12 to enter the movable block 101, thereby smoothly pushing the driving piston rod 102 to pull the sealing blocking block 103, the limiting member 104 and the positioning baffle 801 to move to one side.

[0087] The working principle and use process of the present invention:

[0088] First, the operator can inject the die-cast plastic fluid into the fixed mold 3 and the movable mold 4 through the injection mechanism 2 for molding. After the internal die-cast parts are cooled, a release agent can be introduced into the die-cast parts inside the movable mold 4 to avoid adhesion to the positioning baffle 801. Then the hydraulic cylinder 5 can be started to drive the movable mold 4 as a whole to move to one side, and the end of the demolding ejector rod 701 will squeeze the inner inclined surface of one end of the fixed bracket 803, causing the fixed bracket 803 to move in opposite directions until the inner end of the other side of the fixed bracket 803 is separated from the positioning baffle 801, thereby releasing the clamping and fixing effect of the positioning baffle 801.

[0089] After that, the hydraulic cylinder 5 is continuously driven to drive the movable mold 4 to move to one side, which will cause the inner cavity of one side of the movable mold 4 to squeeze and shrink the expansion plate group 7021, and then the end of the demoulding ejector rod 701 will slide along the inclined surface of the end of the movable block 101, so that the movable block 101 and the limiting piston rod 1102 move in opposite directions, so that the hydraulic oil in the inner cavity of the limiting liquid cavity 1101 is squeezed and pushed through the connecting pipe 12 to be introduced into the inner cavity of the movable block 101, and then the driving piston rod 102 is driven by the hydraulic oil to pull the sealing blocking block 103 and the limiting block 103. The component 104 and the positioning baffle 801 move to one side as a whole, and since the movable block 101, the driving piston rod 102 and the sealing blocking block 103 move in opposite directions, the blocking fixation on one side of the valve disc 9 will be released, and then the movement of the movable mold 4 will make the end of the push piston rod 7032 at the end of the expansion component 702 contact one side of the die-casting. At this time, the space reserved between the positioning baffle 801 and the die-casting can make the expansion plate group 7021 as a whole pushed by the compressed gas in the air cavity 7023, and the air cavity 7023 drives the expansion plate group 7021 to deflect and open.

[0090] Finally, due to the telescopic design of the telescopic rod 70212 and the telescopic plate 70213, the telescopic plate 70213 can smoothly change and expand along with the inner cavity of different moving dies 4, meeting the demoulding requirements of various types of moving dies 4. Then, since the hydraulic cylinder 5 drives the moving die 4 to move, the end of the ejecting piston rod 7032 will be squeezed and retracted into the first hydraulic cavity 7031, causing the hydraulic oil inside the first hydraulic cavity 7031 to be pushed through the communication groove 705 into the second hydraulic cavity 7041, driving the hydraulic piston rod 7042 and the fixed ring 7043 to move to the other side until the fixed ring 7043 blocks and fixes the other side of the expansion plate group 7021. Finally, the demoulding ejector rod 701 and the telescopic expansion plate group 7021 can eject and demould the die-casting parts inside the moving die 4.

[0091] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A demoulding device for a die-casting mould, comprising a die-casting machine tool (1), characterized in that: Further comprising: A shot mechanism (2), which is arranged on one side of the top of the die-casting machine tool (1); A fixed die (3), which is arranged in the inner cavity of the top of the die-casting machine tool (1), and the fixed die (3) is communicated with the end of the shot mechanism (2); A movable die (4), which is slidably connected to the inner cavity of the top of the die-casting machine tool (1), and one side of the movable die (4) is fixedly connected to the output end of a hydraulic cylinder (5) arranged in the inner cavity of the top of the die-casting machine tool (1); A support plate (6), which is arranged on the top inner cavity of the die-casting machine tool (1) and is located between the movable die (4) and the hydraulic cylinder (5), and a demolding mechanism (7) is arranged on one side of the support plate (6); Wherein, the demolding mechanism (7) includes a demolding ejector rod (701) fixedly installed on one side of the support plate (6), an expansion assembly (702) is hinged to the end of the demolding ejector rod (701), a hydraulic actuator assembly (703) is arranged at the end of the demolding ejector rod (701), fixing components (704) are arranged on both sides of one end of the hydraulic actuator assembly (703) inside the demolding ejector rod (701), and the hydraulic actuator assembly (703) and the fixing components (704) are communicated through a communication groove (705).

2. The demolding device for the die-casting mold according to claim 1, wherein: The expansion assembly (702) includes an expansion plate group (7021), a mounting seat (7022), an air cavity (7023) and a top support piston rod (7024); The mounting seat (7022) is arranged on the surface of the end of the demolding ejector rod (701), the expansion plate group (7021) is movably sleeved inside the mounting seat (7022), the air cavity (7023) is opened inside the expansion plate group (7021), and the air cavity (7023) is located inside the inner end shaft of the expansion plate group (7021), and the top support piston rod (7024) is movably installed on both sides of the inner cavity of the air cavity (7023).

3. The demoulding device of the die-casting mould according to claim 2, characterized in that: The expansion plate group (7021) includes a mounting plate (70211), a telescopic rod (70212), a telescopic plate (70213) and a first spring (70214); The mounting plate (70211) is movably sleeved inside the expansion plate group (7021), the telescopic rod (70212) is arranged inside the mounting plate (70211), the telescopic plate (70213) is arranged at the output end of the telescopic rod (70212), and the telescopic plate (70213) is elastically connected to the mounting plate (70211) through the first spring (70214).

4. The demoulding device of the die-casting mould according to claim 1, wherein: The hydraulic actuator assembly (703) includes a first hydraulic cavity (7031), a top push piston rod (7032) and a second spring (7033); The first hydraulic cavity (7031) is opened at the end of the demolding ejector rod (701), the top push piston rod (7032) is movably installed in the inner cavity of the first hydraulic cavity (7031), and the top push piston rod (7032) is elastically connected to the inner wall of the first hydraulic cavity (7031) through the second spring (7033).

5. The demoulding device of the die-casting mould according to claim 1, characterized in that: The fixing component (704) includes a second hydraulic cavity (7041), a hydraulic piston rod (7042) and a fixing ring (7043); The second hydraulic cavity (7041) is formed inside the demolding ejector rod (701), and the second hydraulic cavity (7041) is located outside the communication groove (705). The second hydraulic cavity (7041) is communicated with the first hydraulic cavity (7031) through the communication groove (705). The hydraulic piston rod (7042) is movably installed in the inner cavity of the second hydraulic cavity (7041), and the fixing ring (7043) is arranged at the end of the hydraulic piston rod (7042).

6. The demoulding device of the die-casting mould according to claim 1, characterized in that: A positioning assembly (8) is arranged inside the moving mold (4). The positioning assembly (8) includes a positioning baffle (801), a cylinder (802), a fixing bracket (803) and a third spring (804). The positioning baffle (801) is movably installed in the inner cavity of the moving mold (4). The cylinder (802) is arranged inside the moving mold (4) and is located at the outer end of the positioning baffle (801). The fixing bracket (803) is movably sleeved on the surface of the cylinder (802). The inner end of one side of the fixing bracket (803) is inserted into both sides of the positioning baffle (801). The other side of the fixing bracket (803) extends to the surface of the moving mold (4), and the inner end of the other side of the fixing bracket (803) is designed in an inclined surface. The outer side of the fixing bracket (803) is elastically connected with the inside of the moving mold (4) through the third spring (804).

7. The demoulding device of the die-casting mould according to claim 6, wherein: A valve flap (9) is arranged at the end of the inner groove of the positioning baffle (801). The number of the valve flaps (9) is two, and both of the valve flaps (9) are made of rubber.

8. The demolding device of the die-casting mold according to claim 1, characterized in that: A sealing assembly (10) is arranged in the inner groove on one side of the moving mold (4). The sealing assembly (10) includes a movable block (101), a driving piston rod (102), a sealing blocking block (103) and a limiting member (104). The movable block (101) is movably installed in the inner groove on one side of the moving mold (4). The driving piston rod (102) is movably installed in the inner cavity of the movable block (101). The sealing blocking block (103) is arranged at the end of the driving piston rod (102). The limiting member (104) is arranged at the outer end of the sealing blocking block (103), and the outer end of the limiting member (104) is slidably connected with the inner wall of the positioning baffle (801). One end of the movable block (101) is designed in an inclined surface.

9. The demoulding device of the die-casting mould according to claim 1, characterized in that: A limiting hydraulic assembly (11) is arranged on the inner wall of the moving mold (4) and is located outside the movable block (101). The limiting hydraulic assembly (11) includes a limiting hydraulic cavity (1101), a limiting piston rod (1102) and a tension spring (1103). The limiting hydraulic cavity (1101) is formed inside the moving mold (4), and the limiting hydraulic cavity (1101) is located outside the movable block (101). The limiting piston rod (1102) is movably installed in the inner cavity of the limiting hydraulic cavity (1101). The inner end of the limiting piston rod (1102) is fixedly connected with the surface of the movable block (101). The limiting piston rod (1102) is elastically connected with the inner wall of the limiting hydraulic cavity (1101) through the tension spring (1103).

10. The demoulding device of the die-casting mould according to claim 8, characterized in that: One end of the movable block (101) is fixedly connected and communicated with a communicating pipe (12), and the other end of the communicating pipe (12) is communicated with a limiting liquid cavity (1101).

Images