Ejector device for large die casting machine

Abstract

The utility model discloses an ejector device of a large die-casting machine, belonging to the technical field of die-casting machines. The ejector device comprises an ejector oil cylinder, the ejector oil cylinder comprises a cylinder barrel and a piston rod which are arranged in a matched manner, the piston rod is fixedly connected with an ejector oil cylinder guide rod and a movable template, the ejector oil cylinder guide rod is movably connected with a rear template, the movable template and the rear template can approach and move away from each other along the output direction of the ejector oil cylinder, the cylinder barrel is connected with an ejector plate, the ejector plate can approach and move away from the movable template along the output direction of the ejector oil cylinder, the movable template is fixed with at least one ejector plate guide rod, the ejector plate guide rod is parallel to the piston rod, and the ejector plate is movably connected with the ejector plate guide rod. The scheme of the utility model effectively solves the problems of damaged ejector oil cylinder and oil leakage in the traditional ejector structure, and prolongs the service life of the structure.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to an ejection device of a large die-casting machine. Background Art

[0002] The development of automotive integrated die-casting technology is driving the development of ultra-large die-casting machine technology. Ultra-large die-casting requires high system pressure and clamping force to die-cast large-sized, high-quality castings, and the corresponding molds will also be larger. During the mold change process, large molds also have higher requirements for mold ejection devices.

[0003] In the traditional mold ejection structure, the piston rod is directly connected to the template during the mold ejection process, which plays a role in bearing and guiding. Since the piston rod bears the entire gravity of the ejector plate and is unevenly stressed during movement, the cylinder sags severely during operation, causing the ejector plate to tilt and shake up and down during ejection. At the same time, long-term operation causes serious friction and wear between the upper surface of the piston rod and the inner diameter of the cylinder, and the operating stability of the ejector plate is greatly reduced after a certain period of operation. Due to the poor operating stability of the ejection structure, the connection between the piston rod and the template is easy to loosen, and may even cause the piston rod of the ejector cylinder to break during operation. The tilting of the cylinder during operation and long-term wear lead to widespread oil leakage in the cylinder of this structure.

[0004] In order to solve the above problems, the prior art has provided many technical solutions, such as the U.S. patent with publication number US20240051205A1, which discloses a mold tooling for injection molding, which includes two mold parts that can approach and move away along the tool axis, and also includes a first mold core having a mounting end and a core end. The two mold parts form a mold cavity and a socket in the closed position, and the mold cavity and the socket hold the mounting end between the two mold parts and are suitable for releasing the mounting end in the open position. The invention can facilitate the ejection of the mold so as to remove the molded product from the mold. The technical solution of this invention patent still has room for improvement in the following technical solutions: the mold is subjected to pressure when it is ejected, and the pressure is applied by the cylinder to one side of the mold. The telescopic end of the cylinder is subjected to a large pressure and is prone to wear. Utility Model Content

[0005] The utility model aims to provide an ejection device for a large die-casting machine which can improve the mold transfer stability and reduce wear.

[0006] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0007] The invention discloses an ejector device for a large die-casting machine, comprising an ejector oil cylinder, wherein the ejector oil cylinder comprises a cylinder barrel and a piston rod which are matched with each other, the piston rod is fixedly connected with an ejector oil cylinder guide rod and a movable template, and the ejector oil cylinder guide rod is movably connected with a rear template.

[0008] Preferably, the moving template and the rear template can approach and move away from each other along the output direction of the ejector cylinder. The ejector cylinder guide rod and the piston rod are arranged to guide the rear template in the sliding process relative to the moving template, reduce the interference of the piston rod when the ejector cylinder is working, improve the stability of the rear template relative to the moving template, and at the same time enhance the life of the piston rod and reduce its damage risk;

[0009] The ejector cylinder guide rod not only realizes the sliding guidance of the rear template, but also disperses the load acting on the ejector cylinder because it is fixed to the piston rod, reducing the possibility of piston rod displacement and deformation. On the one hand, it reduces the probability of piston rod damage and reduces maintenance costs. On the other hand, it also reduces the possibility of malfunctions caused by shaking when the rear template moves, thereby improving the operating stability of the die-casting machine.

[0010] Preferably, the oil cylinder is connected with an ejector plate, and the ejector plate can approach and move away from the movable template along the output direction of the ejector oil cylinder.

[0011] Preferably, the oil cylinder is provided with end covers at both ends, and the oil cylinder is assembled with the ejector plate through the end covers. The oil cylinder and the ejector plate are assembled by providing the end covers, which is convenient for disassembly and assembly;

[0012] A through hole is provided on the end cover, and the through hole is equipped with a piston rod and an ejector cylinder guide rod. The piston rod and the ejector cylinder guide rod can pass through the through hole to ensure the coaxiality of the piston rod and the ejector cylinder guide rod relative to the cylinder barrel, thereby ensuring the parallelism of the movable template and the rear template, ensuring that the two molds can move along the piston rod and the ejector cylinder guide rod during the subsequent mold closing and mold opening processes, that is, ensuring the accuracy of mold opening and closing.

[0013] Preferably, the movable template is fixed with at least one ejector plate guide rod, the ejector plate guide rod is parallel to the piston rod, and the ejector plate is movably connected to the ejector plate guide rod. By arranging the ejector cylinder guide rod at the end of the ejector cylinder, the ejector cylinder guide rod can guide the mold during the mold opening and closing process, so that the two molds can move along the axial direction of the piston rod and the ejector cylinder guide rod, ensuring the sliding parallelism between the movable template and the rear template, and improving the stability and accuracy of mold closing and opening;

[0014] During the mold opening and closing process, the ejector cylinder as a whole is subjected to a load in a direction perpendicular to the axis. The load can be dispersed to the ejector plate guide rod through the ejector plate, thereby reducing the load on the piston rod and the cylinder barrel, so as to reduce or avoid deformation of the piston rod and the cylinder barrel due to excessive load during mold ejection, which may cause the ejection mold to tilt and shake. Furthermore, by providing an ejector plate and an ejector plate guide rod, the force can be further dispersed to the ejector plate during the mold ejection process, and the contact surface during the ejection process can be increased by the ejector plate, thereby avoiding the problem of repeated friction between the piston rod and the inner diameter of the cylinder barrel and loose connection between the piston rod and the template in the prior art, which may cause the piston rod to break.

[0015] Preferably, the ejector oil cylinder guide rod is coaxially arranged with the piston rod, and the rear template has a through groove, through which the ejector oil cylinder guide rod passes. The through groove is arranged with the ejector oil cylinder guide rod, and the ejector oil cylinder guide rod can slide in the through groove to realize the sliding guide of the rear template. The ejector oil cylinder guide rod and the piston rod are coaxially arranged to reduce the unbalanced load at the connection between the two, and prevent the two from breaking at the connection. Since the ejector oil cylinder guide rod disperses the vertical pressure on the piston rod, the through groove forms a support for the ejector oil cylinder guide rod during the sliding process, and the displacement of the piston rod relative to the cylinder barrel is stabilized by stabilizing the ejector oil cylinder guide rod, which further reduces the possibility of internal wear of the ejector oil cylinder, reduces the possibility of oil leakage of the cylinder body, and improves the operating stability of the die-casting machine.

[0016] Preferably, the rear template is provided with a groove on one side close to the oil cylinder barrel, and the groove is arranged in cooperation with the oil cylinder barrel. The groove can accommodate the oil cylinder barrel, and the oil cylinder barrel can enter the groove and abut against the inner end surface of the groove to realize the ejection of the rear template. The cooperation of the two can further guide the ejection process of the rear template and improve the stability. On the other hand, the oil cylinder barrel forms contact after entering the groove, which is conducive to the dispersion of the load force on the oil cylinder barrel, thereby increasing the service life of the oil cylinder barrel and the piston rod and reducing the maintenance frequency.

[0017] The setting of the groove ensures the parallelism of the contact between the end of the cylinder barrel and the end face of the rear template, so as to ensure that the rear template is subjected to a force perpendicular to the end face, further reducing the possibility of shaking when the rear template is ejected, and improving the accuracy of mold closing and opening.

[0018] Preferably, the groove and the through groove are arranged coaxially, and the groove and the through groove are connected. After the oil cylinder barrel enters the groove, it squeezes the gas in the groove, and part of the gas flows out from the narrow gap between the groove and the oil cylinder barrel, and the other part of the gas enters the through groove connected to the groove. During the process that the oil cylinder barrel slides relative to the piston rod and ejects the rear template, the ejector oil cylinder guide rod slides relative to the rear template in the through groove. During the sliding process, the ejector oil cylinder guide rod generates heat due to friction. The airflow entering the through groove from the groove can cool and dissipate the ejector oil cylinder guide rod, thereby extending the life of the ejector oil cylinder guide rod and reducing maintenance costs.

[0019] Preferably, the ejector plate array is provided with through holes, and the ejector plate has a side surface that can contact the movable template, and the side surface is parallel to the end surface of the adjacent movable template. When the ejector oil cylinder performs an ejection action, the cylinder barrel carries the ejector plate to slide relative to the ejector plate guide rod. The provision of the through holes reduces the weight of the ejector plate, thereby reducing the external load on the cylinder barrel and the ejector plate guide rod, and further reduces the possibility of oil leakage or jamming caused by deformation of the ejector oil cylinder; when the ejector oil cylinder retracts, the parallel side surface and the end surface can fit together.

[0020] Preferably, the inside of the oil cylinder barrel and the piston rod form a first oil chamber and a second oil chamber, and the piston rod and the ejector oil cylinder guide rod have a first oil circuit and a second oil circuit connected to each other, the first oil circuit is connected to the first oil chamber, the second oil circuit is connected to the second oil chamber, and the first oil circuit and the second oil circuit both pass through the ejector oil cylinder guide rod. By passing oil through the first oil circuit and the second oil circuit of the ejector oil cylinder guide rod, the piston rod can move relative to the piston barrel in two directions, thereby realizing the ejection action and the retraction action;

[0021] Since one end of the ejector cylinder guide rod passes through the through groove and is located outside the rear template, oil is pumped to the first oil circuit and the second oil circuit through this end, and there is no need to arrange related components on the side of the cylinder barrel. On the one hand, the load on the cylinder barrel is reduced, thereby reducing the possibility of deformation and wear and improving the accuracy. On the other hand, the spatial layout outside the cylinder barrel is optimized, the ejection and retraction space is increased, and the assembly and disassembly of surrounding components are convenient.

[0022] Compared with the prior art, the utility model has the following beneficial effects: compared with the traditional ejection without a guide rod, the structure reduces the load of the ejector cylinder through the ejector plate guide rod, reduces the possibility of damage to the piston rod, and improves the smoothness and fluency of operation; the ejector cylinder guide rod and the cylinder barrel are used to guide the plate body sliding, thereby improving the accuracy of mold closing and opening; the connection method of the ejector plate, the ejector plate guide rod and the piston rod forms multiple guides, which reduces the unbalanced load and is not easy to loosen, thereby extending the service life of the components and improving the stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the application state of a mold ejection structure of a large die-casting machine of the utility model;

[0025] Figure 2 This is a schematic diagram of a die ejection structure scheme of a large die-casting machine of the utility model;

[0026] Figure 3 It is a cross-sectional schematic diagram of the connection between the ejection cylinder and the top plate;

[0027] Figure 4 It is a cross-sectional schematic diagram of the first oil circuit and the second oil circuit.

[0028] Reference numerals: ejector plate 1; ejector plate guide rod 2; ejector cylinder guide rod 3; piston rod 4; movable template 5; cylinder barrel 6; end cover 7; rear template 8; first oil circuit 31; second oil circuit 32; first oil chamber 61; second oil chamber 62. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0031] See attached Figure 1 -Attached Figure 3 , an ejector device of a large die-casting machine, comprising: an ejector cylinder, the ejector cylinder comprising a cylinder barrel 6 and a piston rod 4 that are arranged in a coordinated manner, the piston rod 4 is fixedly connected to an ejector cylinder guide rod 3 and a movable template 5, and the ejector cylinder guide rod 3 is movably connected to a rear template 8.

[0032] The movable template 5 and the rear template 8 can approach and move away from each other along the output direction of the ejector cylinder. The configuration of the ejector cylinder guide rod 3 and the piston rod 4 can guide the rear template 8 in the sliding process relative to the movable template 5, reduce the interference received by the piston rod 4 when the ejector cylinder is working, improve the stability of the rear template 8 relative to the movable template 5, and at the same time enhance the life of the piston rod 4 and reduce its damage risk;

[0033] While the ejector cylinder guide rod 3 realizes the sliding guidance of the rear template 8, since it is fixedly connected to the piston rod 4, it disperses the load acting on the ejector cylinder and reduces the possibility of displacement and deformation of the piston rod 4. On the one hand, it reduces the probability of damage to the piston rod 4 and reduces maintenance costs. On the other hand, it also reduces the possibility of malfunctions caused by shaking when the rear template 8 moves, thereby improving the operating stability of the die-casting machine.

[0034] The oil cylinder barrel 6 is connected with an ejector plate 1, and the ejector plate 1 can approach and move away from the movable template 5 along the output direction of the ejector oil cylinder.

[0035] The oil cylinder 6 is provided with end covers 7 at both ends, and the oil cylinder 6 is assembled with the ejector plate 1 through the end covers 7. The oil cylinder 6 and the ejector plate 1 are assembled by providing the end covers 7, which is convenient for disassembly and assembly;

[0036] A through hole is provided on the end cover 7, and the through hole is equipped with the piston rod 4 and the ejector cylinder guide rod 3. The piston rod 4 and the ejector cylinder guide rod 3 can pass through the through hole to ensure the coaxiality of the piston rod 4 and the ejector cylinder guide rod 3 relative to the cylinder barrel 6, thereby ensuring the parallelism of the movable template 5 and the rear template 8, ensuring that the two molds can move along the piston rod 4 and the ejector cylinder guide rod 3 during the subsequent mold closing and mold opening processes, that is, ensuring the accuracy of mold opening and closing.

[0037] The movable template 5 is fixed with at least one ejector plate guide rod 2, which is parallel to the piston rod 4, and the ejector plate 1 is movably connected to the ejector plate guide rod 2. By arranging the ejector cylinder guide rod 3 at the end of the ejector cylinder, the ejector cylinder guide rod 3 can guide the mold during the mold opening and closing process, so that the two molds can move along the axial direction of the piston rod 4 and the ejector cylinder guide rod 3, ensuring the sliding parallelism between the movable template 5 and the rear template 8, and improving the stability and accuracy of mold closing and opening;

[0038] During the mold opening and closing process, the ejector cylinder as a whole is subjected to a load in a direction perpendicular to the axis, and the load can be dispersed to the ejector plate guide rod 2 through the ejector plate 1, thereby reducing the load on the piston rod 4 and the cylinder barrel 6, so as to reduce or avoid the deformation of the piston rod 4 and the cylinder barrel 6 due to excessive load during the mold ejection process, which may cause the ejection mold to tilt and shake. Furthermore, by providing the ejector plate 1 and the ejector plate guide rod 2, the force is further dispersed to the ejector plate 1 during the mold ejection process, and the contact surface during the ejection process is increased by the ejector plate 1, thereby avoiding the problem of repeated friction between the piston rod 4 and the inner diameter of the cylinder barrel and the loose connection between the piston rod 4 and the template in the prior art, which may cause the piston rod 4 to break.

[0039] The ejector oil cylinder guide rod 3 is coaxially arranged with the piston rod 4, and the rear template 8 has a through groove, through which the ejector oil cylinder guide rod 3 passes. The through groove is arranged with the ejector oil cylinder guide rod 3, and the ejector oil cylinder guide rod 3 can slide in the through groove to realize the sliding guide of the rear template 8. The ejector oil cylinder guide rod 3 and the piston rod 4 are coaxially arranged to reduce the unbalanced load at the connection between the two and prevent the two from breaking at the connection. Since the ejector oil cylinder guide rod 3 disperses the vertical pressure on the piston rod 4, the through groove forms a support for the ejector oil cylinder during the sliding process, and the displacement of the piston rod 4 relative to the cylinder barrel 6 is stabilized by stabilizing the ejector oil cylinder guide rod 3, which further reduces the possibility of internal wear of the ejector oil cylinder, reduces the possibility of oil leakage in the cylinder body, and improves the operating stability of the die-casting machine.

[0040] The rear template 8 is provided with a groove on one side close to the oil cylinder 6, and the groove is arranged in cooperation with the oil cylinder 6. The groove can accommodate the oil cylinder 6, and the oil cylinder 6 can enter the groove and abut the inner end surface of the groove to realize the ejection of the rear template 8. The cooperation of the two can further guide the ejection process of the rear template 8 and improve the stability. On the other hand, the oil cylinder 6 forms contact after entering the groove, which is conducive to the dispersion of the load force on the oil cylinder 6, thereby improving the service life of the oil cylinder 6 and the piston rod 4 and reducing the maintenance frequency.

[0041] The setting of the groove ensures the parallelism of the contact between the end of the cylinder barrel 6 and the end face of the rear template 8, so as to ensure that the rear template 8 is subjected to a force perpendicular to the end face, further reducing the possibility of shaking when the rear template 8 is ejected, and improving the accuracy of mold closing and opening.

[0042] The groove and the through groove are coaxially arranged, and the groove and the through groove are communicated with each other.

[0043] After the cylinder barrel 6 enters the groove, it squeezes the gas in the groove. Part of the gas flows out from the narrow gap between the groove and the cylinder barrel 6, and the other part of the gas enters the through groove connected to the groove. As the cylinder barrel 6 slides relative to the piston rod 4 and ejects the rear template 8, the ejector cylinder guide rod 3 slides relative to the rear template 8 in the through groove. During the sliding process, the ejector cylinder guide rod 3 generates heat due to friction. The airflow from the groove into the through groove can cool and dissipate heat for the ejector cylinder guide rod 3, thereby extending the life of the ejector cylinder guide rod 3 and reducing the maintenance cost.

[0044] The ejector plate 1 is provided with through holes in an array, and the ejector plate 1 has a side surface that can contact the movable template 5, and the side surface is parallel to the end surface of the adjacent movable template 5. When the ejector oil cylinder performs an ejection action, the cylinder barrel 6 carries the ejector plate 1 to slide relative to the ejector plate guide rod 2. The provision of the through holes reduces the weight of the ejector plate 1, thereby reducing the external load received by the cylinder barrel 6 and the ejector plate guide rod 2, and further reduces the possibility of oil leakage or jamming caused by deformation of the ejector oil cylinder; when the ejector oil cylinder retracts, the parallel side surface and the end surface can fit together.

[0045] See attached Figure 4The inside of the cylinder barrel 6 and the piston rod 4 form a first oil chamber 61 and a second oil chamber 62. The piston rod 4 and the ejector cylinder guide rod 3 have a first oil passage 31 and a second oil passage 32 connected to each other. The first oil passage 31 is connected to the first oil chamber 61, and the second oil passage 32 is connected to the second oil chamber 62. The first oil passage 31 and the second oil passage 32 both pass through the ejector cylinder guide rod 3.

[0046] By passing oil through the first oil passage 31 and the second oil passage 32 of the ejector oil cylinder guide rod 3, the piston rod 4 is moved in two directions relative to the piston cylinder, thereby realizing the ejection action and the retraction action;

[0047] Since one end of the ejector cylinder guide rod 3 passes through the through groove and is located outside the rear template 8, oil is pumped to the first oil circuit 31 and the second oil circuit 32 through this end, and there is no need to arrange related components on the side of the cylinder barrel 6. On the one hand, the load on the cylinder barrel 6 is reduced, thereby reducing the possibility of its deformation and wear and improving the accuracy. On the other hand, the spatial layout outside the cylinder barrel 6 is optimized, the ejection and retraction space is increased, and the assembly and disassembly of surrounding components are facilitated.

[0048] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

[0049] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An ejection device for a large die-casting machine, comprising: The ejector oil cylinder is characterized in that: the ejector oil cylinder comprises a cylinder barrel (6) and a piston rod (4) which are arranged in a coordinated manner; the piston rod (4) is fixedly connected to an ejector oil cylinder guide rod (3) and a movable template (5); and the ejector oil cylinder guide rod (3) is movably connected to a rear template (8).

2. The ejector device of a large die-casting machine according to claim 1, characterized in that: The movable template (5) and the rear template (8) can move closer to and farther from each other along the output direction of the ejector cylinder.

3. The ejector device of a large die-casting machine according to claim 1, characterized in that: The oil cylinder barrel (6) is connected to a ejector plate (1), and the ejector plate (1) can move closer to and farther from the movable template (5) along the output direction of the ejector oil cylinder.

4. The ejector device of a large die-casting machine according to claim 3, characterized in that: The oil cylinder barrel (6) is provided with end covers (7) at both ends, and the oil cylinder barrel (6) is assembled with the ejector plate (1) via the end covers (7).

5. The ejector device of a large die-casting machine according to claim 3, characterized in that: The movable template (5) is fixed with at least one ejector plate guide rod (2), the ejector plate guide rod (2) is parallel to the piston rod (4), and the ejector plate (1) is movably connected to the ejector plate guide rod (2).

6. The ejector device of a large die-casting machine according to claim 1, characterized in that: The ejector oil cylinder guide rod (3) is coaxially arranged with the piston rod (4), and the rear template (8) has a through groove, and the ejector oil cylinder guide rod (3) passes through the through groove.

7. The ejector device of a large die-casting machine according to claim 6, characterized in that: The rear template (8) is provided with a groove on a side close to the oil cylinder barrel (6), and the groove is arranged in cooperation with the oil cylinder barrel (6).

8. The ejector device of a large die-casting machine according to claim 7, characterized in that: The groove and the through slot are coaxially arranged, and the groove and the through slot are communicated with each other.

9. The ejector device of a large die-casting machine according to claim 3, characterized in that: The ejector plate (1) is provided with through holes in an array, and the ejector plate (1) has a side surface capable of contacting the movable template (5), and the side surface is parallel to the adjacent end surface of the movable template (5).

10. The ejector device of a large die-casting machine according to claim 3, characterized in that: The interior of the oil cylinder barrel (6) and the piston rod (4) form a first oil chamber (61) and a second oil chamber (62); the piston rod (4) and the ejector cylinder guide rod (3) have a first oil passage (31) and a second oil passage (32) connected thereto; the first oil passage (31) is connected to the first oil chamber (61), the second oil passage (32) is connected to the second oil chamber (62), and the first oil passage (31) and the second oil passage (32) are both connected to the ejector cylinder guide rod (3).

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