Low pressure casting mold ejector mechanism

Abstract

The utility model relates to hub manufacturing technical field, and disclose a kind of low-pressure casting mould ejector rod mechanism, it includes by split setting push rod and telescopic rod constitute ejector rod assembly, it further includes the guide sleeve fixed in mould body, its inner cavity provides guide passage for ejector rod assembly, push rod top end connects die-casting machine ejector rod plate, telescopic rod sliding adaptation in guide sleeve. The utility model can avoid the eccentric wear problem generated by the inclination of ejector rod, effectively reduce the phenomenon of ejector rod operation jam and mould run aluminum, prolong the service life of ejector rod and sleeve, reduce maintenance frequency and cost;Laser displacement sensor passes through digital detection push rod stroke, effectively promote displacement control precision and automation control level, avoid the deformation of hub caused by excessive ejection or ejection not in place causes stripping failure, significantly improve product qualification rate;Contact switch as backup protection device, can prevent push rod overstroke damage component, adapt to foundry workshop dust, vibration and other complex environment.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub manufacturing technology, and in particular to a low-pressure casting mold ejector mechanism. Background Technology

[0002] In low-pressure casting wheel production, the demolding process is a crucial link between the die-casting of the wheel blank and subsequent processing. Its operational efficiency and stability directly affect the production line's uptime, product qualification rate, and production costs. Existing demolding devices typically consist of an integrally formed long ejector rod and ejector sleeve. The ejector sleeve is fixed to the mold body and is a hollow cylindrical shape that provides guidance. The long ejector rod is an integral structure (200-400mm in length), with its upper end connected to the ejector plate and its lower end sliding to fit the ejector sleeve. During operation, the hydraulic system drives the ejector plate to move downwards, which in turn moves the long ejector rod downwards along the inner wall of the ejector sleeve, ejecting the wheel hub from the mold top and completing the demolding process.

[0003] However, in actual operation, the one-piece molded long ejector pin only mates with the ejector pin sleeve at its lower 15mm. This presents several significant drawbacks: First, the ejector pin is prone to uneven movement, leading to increased wear on the ejector pin sleeve and subsequent jamming. Furthermore, the increased clearance due to wear can cause molten aluminum to seep in (i.e., aluminum leakage). Second, the ejector pin sleeve requires frequent replacement due to severe wear, significantly increasing production costs. Third, the lack of data-driven methods for detecting ejector pin movement distance makes it impossible to accurately control displacement based on actual product requirements, easily resulting in excessive or insufficient ejector pin movement, affecting demolding stability and production efficiency.

[0004] Therefore, developing a new type of ejector mechanism for low-pressure casting molds to overcome the above-mentioned defects is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this utility model is to address the above-mentioned problems by providing a low-pressure casting mold ejector mechanism. The technical solution adopted by this utility model is as follows: A low-pressure casting mold ejector mechanism includes an ejector assembly, which consists of a push rod and a telescopic rod separately arranged, and also includes a guide sleeve nested and fixed inside the mold body. The guide sleeve vertically penetrates the mold body, and its inner cavity provides a guide channel for the ejector assembly. The top end of the push rod is connected to the ejector plate of the die-casting machine, and the telescopic rod is slidably adapted to the guide sleeve.

[0006] Preferably, the guide sleeve has an axial cavity for assembling a powerful spring, a stop seat is fixedly provided at the bottom of the cavity, a guide hole is provided at the center of the stop seat, the telescopic rod has a T-shaped structure, the lower part of the telescopic rod passes through the powerful spring, and the bottom part passes through the guide hole; the upper and lower parts of the telescopic rod are slidably connected to the inner wall of the cavity and the guide hole, respectively.

[0007] Preferably, a retaining ring is detachably provided on the top of the accommodating cavity. The outer diameter of the retaining ring is machined with an external thread, which is adapted to the internal thread of the inner wall of the accommodating cavity. The inner diameter of the retaining ring is smaller than the diameter of the upper end of the telescopic rod, while the inner diameter of the retaining ring is larger than the diameter of the push rod.

[0008] Preferably, a laser displacement sensor is provided on the mold body corresponding to the movement path of the push rod. The laser displacement sensor is linked to the hydraulic system of the die-casting machine through a communication line, and can detect the displacement data of the push rod in real time to determine the extension length of the telescopic rod. A detection block is fixedly provided on the push rod. The detection block is made of highly reflective aluminum alloy, and the detection end of the laser displacement sensor faces the surface of the detection block.

[0009] Preferably, a laser displacement sensor is provided on the mold body corresponding to the movement path of the push rod. The laser displacement sensor is linked to the hydraulic system of the die-casting machine through a communication line, and can detect the displacement data of the push rod in real time to determine the extension length of the telescopic rod. A detection block is fixedly provided on the push rod. The detection block is made of highly reflective aluminum alloy, and the detection end of the laser displacement sensor faces the surface of the detection block.

[0010] Preferably, a contact switch is fixedly installed on the mold body at the downward limit position of the push rod. The contact switch is communicatively connected to the hydraulic system of the die-casting machine and serves as the limit protection for the downward movement of the push rod. A trigger block is fixedly installed at the lower part of the push rod, and the position of the trigger block is adapted to the trigger end of the contact switch. The beneficial effects of this utility model are as follows: This utility model addresses the problems in the existing technology, such as the easy wear of integrated long ejector rods leading to operational jamming and aluminum leakage, frequent replacement of ejector rod sleeves increasing costs, low displacement control accuracy easily causing product defects, and lack of safety protection easily damaging equipment. It provides a targeted solution with the following specific benefits: The separate design of the push rod and telescopic rod, combined with the double-guide structure of the guide sleeve, avoids the problem of uneven wear caused by the ejector rod's tilt, effectively reducing ejector rod operational jamming and mold aluminum leakage, extending the service life of the ejector rod and sleeve, and reducing maintenance frequency and costs; laser displacement sensor. By digitally detecting the push rod stroke, the displacement control accuracy and automation level are effectively improved, avoiding excessive ejection that could cause wheel hub deformation or insufficient ejection that could lead to demolding failure, thus significantly improving the product qualification rate. The contact switch, as a backup protection device, can prevent the push rod from overtraveling and damaging components, adapting to the complex environment of the foundry workshop, such as dust and vibration, and improving the safety of equipment operation. In addition, the powerful spring enables the telescopic rod to return automatically without additional power, reducing energy consumption. The detachable and adjustable retaining ring can be adapted to different specifications of wheel hubs, simplifying the structure while improving the versatility of the mechanism, fully meeting the needs of continuous and high-quality production of low-pressure cast wheel hubs. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a partially enlarged schematic diagram of part A of this utility model.

[0014] In the diagram: 10--Ejector rod assembly; 11--Push rod; 12--Telescopic rod; 20--Mold body; 30--Guide sleeve; 31--Accommodation cavity; 32--Stop seat; 33--Retaining ring; 34--Strong spring; 40--Laser displacement sensor; 41--Detection block; 42--Contact switch; 43--Trigger block. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] like Figure 1-2 As shown, a low-pressure casting mold ejector mechanism includes an ejector assembly 10 for ejecting a wheel hub blank. The ejector assembly 10 consists of a separately configured push rod 11 and a telescopic rod 12. It also includes a guide sleeve 30 nested and fixed within the mold body 20. The guide sleeve 30 vertically penetrates the mold body 20, and its inner cavity provides a guiding channel for the ejector assembly 10. Specifically, the top end of the push rod 11 is connected to the ejector plate of the die-casting machine, obtaining lifting power transmitted by the hydraulic system through the top plate; the telescopic rod 12 is slidably adapted within the guide sleeve 30 to perform the ejection operation of the wheel hub blank.

[0017] During demolding, the hydraulic system of the die-casting machine drives the ejector plate downward, which in turn drives the push rod 11 to move vertically downward simultaneously. When the bottom end of the push rod 11 contacts the telescopic rod 12, it continues to transmit thrust, driving the telescopic rod 12 to be stably ejected under the guidance of the guide sleeve 30, thus separating the hub blank from the mold body 20 and completing the demolding action. In this embodiment, the split ejector assembly 10 breaks through the structural limitations of the traditional one-piece long ejector. Even if the push rod 11 tilts slightly due to assembly errors or long-term use, the telescopic rod 12 can still be ejected vertically under the constraint of the guide sleeve 30, greatly improving the error tolerance of the action; effectively avoiding the problem of uneven wear between the ejector and the sleeve in the traditional structure, reducing ejector jamming and aluminum leakage from the mold body 20, while extending the service life of the ejector assembly 10 and the guide sleeve 30, reducing maintenance frequency and cost.

[0018] Preferably, a strong spring 34 is installed inside the guide sleeve 30 to achieve automatic return of the telescopic rod 12 without the need for additional power drive. Specifically, the guide sleeve 30 has an axially oriented cavity 31 for accommodating the strong spring 34. A stop seat 32 is fixedly installed at the bottom of the cavity 31, and a guide hole is opened in the center of the stop seat 32. The telescopic rod 12 has a T-shaped structure, with its lower part passing through the strong spring 34 and its bottom part passing through the guide hole. The upper and lower parts of the telescopic rod 12 are slidably connected to the inner wall of the cavity 31 and the guide hole, respectively, to achieve dual guidance for the telescopic rod 12. The dual-guide structure significantly improves the movement accuracy of the telescopic rod 12, further reduces its contact wear with the guide sleeve 30, and extends the service life of the component. At the same time, the precise ejection action can prevent the wheel hub blank from deforming due to uneven force, thereby improving the product qualification rate.

[0019] Preferably, a retaining ring 33 is detachably provided on the top of the receiving cavity 31. The outer diameter of the retaining ring 33 is machined with external threads, which are adapted to the internal threads of the inner wall of the receiving cavity 31, so as to realize convenient disassembly and assembly and position adjustment of the retaining ring 33. The inner diameter of the retaining ring 33 is smaller than the diameter of the upper end of the telescopic rod 12, which can form a mechanical block when the telescopic rod 12 moves upward and returns to its original position, limiting its upward limit position and preventing the telescopic rod 12 from moving excessively upward and leaving the receiving cavity 31. At the same time, the inner diameter of the retaining ring 33 is larger than the diameter of the push rod 11, ensuring that the push rod 11 can smoothly pass through the inner hole of the retaining ring 33 and contact the telescopic rod 12 during demolding. The threaded retaining ring 33 facilitates the adjustment of the installation position according to the stroke requirements of telescopic rods 12 of different specifications, improving the versatility of the mechanism; the position-adjustable retaining ring 33 can accurately limit the upward limit position of the telescopic rod 12, ensuring the positional accuracy of the telescopic rod 12.

[0020] Preferably, a laser displacement sensor 40 is installed on the mold body 20 corresponding to the movement path of the push rod 11. The laser displacement sensor 40 is linked to the hydraulic system of the die-casting machine through a communication line, and can detect the displacement data of the push rod 11 in real time, thereby determining the ejection length of the telescopic rod 12. A detection block 41 is fixedly installed on the push rod 11. The detection block 41 is made of highly reflective aluminum alloy. The detection end of the laser displacement sensor 40 faces the surface of the detection block 41 to ensure stable signal acquisition. During demolding, the hydraulic system of the die-casting machine drives the push rod 11 downward. The laser displacement sensor 40 synchronously collects the displacement data of the detection block 41. When the displacement value reaches the preset ejection stroke, the sensor immediately sends a stop command to the hydraulic system. The hydraulic system automatically cuts off the power, and the push rod 11 stops moving downward. This accurately controls the ejection length of the telescopic rod 12, effectively avoiding problems such as hub deformation due to excessive ejection or demolding failure due to insufficient ejection, thus improving demolding consistency and product quality.

[0021] Preferably, a contact switch 42 is fixedly installed on the mold body 20 at the downward limit position of the push rod 11. The contact switch 42 is communicatively connected to the hydraulic system of the die-casting machine, serving as a double limit protection for the downward movement of the push rod 11. A trigger block 43 is fixedly installed at the lower part of the push rod 11, and the position of the trigger block 43 is adapted to the trigger end of the contact switch 42. When the push rod 11 moves downward to the limit position, the trigger block 43 just abuts against the trigger end of the contact switch 42. During demolding, if the laser displacement sensor 40 fails to send a stop command due to a malfunction, the trigger block 43 continues to move downward with the push rod 11 and abuts against the contact switch 42. The contact switch 42 immediately sends an emergency stop command to the hydraulic system, forcibly cutting off the hydraulic power and preventing the push rod 11 from overtraveling and causing damage to the telescopic rod 12, guide sleeve 30, or hydraulic components. The contact switch 42 serves as a backup protection device for the laser displacement sensor 40, significantly reducing the risk of equipment damage caused by a single component failure. Its mechanical triggering method is stable and reliable, unaffected by environmental factors such as dust and vibration in the foundry workshop, ensuring the effectiveness of the limit switch function, extending the overall service life of the push rod mechanism, and reducing equipment maintenance costs.

[0022] The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered as protected by this utility model.

Claims

1. A push rod mechanism for a low-pressure casting mold, characterized in that: The assembly includes a push rod assembly (10), which consists of a push rod (11) and a telescopic rod (12) that are separately arranged. It also includes a guide sleeve (30) nested and fixed inside the mold body (20). The guide sleeve (30) vertically penetrates the mold body (20), and its inner cavity provides a guide channel for the push rod assembly (10). The top end of the push rod (11) is connected to the die-casting machine push rod plate, and the telescopic rod (12) slides and adapts to the guide sleeve (30).

2. The ejector mechanism for a low-pressure casting mold according to claim 1, characterized in that: The guide sleeve (30) has an axial cavity (31) for assembling a strong spring (34). A stop seat (32) is fixedly provided at the bottom of the cavity (31). A guide hole is provided in the center of the stop seat (32). The telescopic rod (12) has a T-shaped structure. Its lower part passes through the strong spring (34), and its bottom passes through the guide hole. The upper and lower parts of the telescopic rod (12) are slidably connected to the inner wall of the cavity (31) and the guide hole, respectively.

3. The ejector mechanism for a low-pressure casting mold according to claim 2, characterized in that: The top of the accommodating cavity (31) is detachably provided with a retaining ring (33). The outer diameter of the retaining ring (33) is machined with an external thread, which is adapted to the internal thread of the inner wall of the accommodating cavity (31). The inner diameter of the retaining ring (33) is smaller than the diameter of the upper end of the telescopic rod (12), while the inner diameter of the retaining ring (33) is larger than the diameter of the push rod (11).

4. The ejector mechanism for a low-pressure casting mold according to claim 1, characterized in that: A laser displacement sensor (40) is provided on the mold body (20) corresponding to the moving path of the push rod (11). The laser displacement sensor (40) is linked with the hydraulic system of the die casting machine through a communication line, and can detect the displacement data of the push rod (11) in real time to determine the ejection length of the telescopic rod (12). A detection block (41) is fixedly provided on the push rod (11). The detection block (41) is made of high reflective aluminum alloy, and the detection end of the laser displacement sensor (40) faces the surface of the detection block (41).

5. The ejector mechanism for a low-pressure casting mold according to claim 1, characterized in that: A contact switch (42) is fixedly installed on the mold body (20) at the downward limit position of the push rod (11). The contact switch (42) is connected to the hydraulic system of the die casting machine and serves as the limit protection for the downward movement of the push rod (11). A trigger block (43) is fixedly installed at the lower part of the push rod (11). The position of the trigger block (43) is adapted to the trigger end of the contact switch (42).

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