Device for solving ejection imbalance caused by shrinkage of riser of low-pressure casting mold

Abstract

The device comprises an upper die and a lower die which are stacked up and down, a top plate assembly is arranged above the upper die, a riser jacking device and a first jacking rod inserted into a die cavity are installed on the top plate assembly, and the riser jacking device comprises a fixing block; a first guide block and a second guide block are installed on the two sides of the interior of the fixing block correspondingly, the second guide block slides up and down along the inner wall of the fixing block within a certain range, racks are vertically arranged on the inner side of the first guide block and the inner side of the second guide block correspondingly, and the first guide block and the second guide block are in transmission through a gear; the first guide block synchronously slides up and down along with the second guide block, a check block is installed in the fixing block and located above the second guide block, a spring is installed between the check block and the second guide block, the lower end of the first guide block is connected with a return rod, and the lower end of the second guide block is connected with a second ejector rod. By optimizing the riser jacking device, the influence of riser shrinkage on jacking balance is effectively reduced, the casting quality is improved, and the yield is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low pressure casting, in particular to a device for solving the imbalance caused by the shrinkage of the riser of a low pressure casting mold. BACKGROUND

[0002] In the process of low pressure casting, the design and manufacture of the riser have a significant impact on the quality of the casting. The main role of the riser is to compensate for the shrinkage of the casting during the solidification process, preventing defects such as shrinkage holes and shrinkage porosity. However, the riser also shrinks during the solidification process, causing imbalance during ejection, affecting the ejection quality of the casting and the service life of the mold. Existing solutions focus on optimizing the design of the riser or adjusting the ejection mechanism, but the effect is limited and cannot fundamentally solve the problem of imbalance caused by the shrinkage of the riser. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a device for solving the imbalance caused by the shrinkage of the riser of a low pressure casting mold, which effectively reduces the impact of riser shrinkage on ejection balance by optimizing the riser and ejection device, improves the quality of the casting, and improves the yield; through mechanical linkage and elastic compensation mechanism, effectively solve the ejection lag problem caused by the shrinkage of the riser, improve the quality of the casting and the service life of the mold, have the advantages of simple structure and high reliability.

[0004] The technical solution adopted by the present application to solve the technical problem is to provide a device for solving the imbalance caused by the shrinkage of the riser of a low pressure casting mold, comprising an upper mold and a lower mold stacked on top of each other, a top plate assembly is provided above the upper mold, a riser and ejection device and a top rod one inserted into the mold cavity are installed on the top plate assembly, the riser and ejection device comprises a fixed block, the inside of the fixed block is provided with a guide block one and a guide block two on both sides respectively, the guide block two slides up and down within a certain range along the inner wall of the fixed block, the inside of the guide block one and the inside of the guide block two are both provided with a rack vertically, the guide block one and the guide block two are connected through a gear transmission, the guide block one slides up and down synchronously with the guide block two, a stop block is installed inside the fixed block above the guide block two, a spring is installed between the stop block and the guide block two, a return rod is connected to the lower end of the guide block one, and a top rod two is connected to the lower end of the guide block two.

[0005] As a supplement to the technical solution of the present application, the top plate assembly comprises a top plate and a top rod fixing plate, the top rod fixing plate is installed at the lower end of the top plate, the top rod is fixed at the lower end of the top plate through the top rod fixing plate, and the top rod fixing plate and the top plate are connected and fixed by fasteners.

[0006] As a supplement to the technical scheme of the application, the fixed block is a T-shaped block structure, and the two protrusions on the upper part of the fixed block are buckled on the top plate and fixed by screws.

[0007] As a supplement to the technical scheme of the application, the lower end of the guide block one and the lower end of the guide block two are provided with T-shaped clamping grooves, which are used for clamping the return rod or the ejector rod two.

[0008] As a supplement to the technical scheme of the application, one side of the guide block two is provided with a long slit, and the front end of the fixed block is inserted into a limiting block which is located in the long slit.

[0009] As a supplement to the technical scheme of the application, the inner wall of the fixed block and the stop block are fixed by a positioning pin.

[0010] As a supplement to the technical scheme of the application, the gear has two, and the two gears are arranged in an upper and lower staggered manner and are engaged together, the upper gear is engaged with the rack on the side edge of the guide block two, and the lower gear is engaged with the rack on the side edge of the guide block one.

[0011] As a supplement to the technical scheme of the application, the upper end of the guide block two is provided with a spring cavity for accommodating a spring, and the spring cavity is a circular groove structure.

[0012] Beneficial effects: The application relates to a device for solving the imbalance of ejection caused by the shrinkage of a low-pressure casting mold riser, which effectively reduces the influence of the shrinkage of the riser on the ejection balance by optimizing the riser and ejection device, improves the casting quality and the yield, effectively solves the ejection lag caused by the shrinkage of the riser through a mechanical linkage and an elastic compensation mechanism, improves the casting quality and the mold life, and has the advantages of simple structure and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of the application;

[0014] Figure 2 is a sectional view of the riser and ejection device;

[0015] Figure 3 is an exploded view of the riser and ejection device;

[0016] Figure 4 is a structural schematic diagram between the guide block one and the guide block two.

[0017] Figure: 1, riser and ejector device, 2, ejector plate, 3, ejector rod fixing plate, 5, upper mold, 6, lower mold, 7, casting, 8, sand core, 9, riser, 10, screw, 11, fixing block, 12, guide block one, 13, spring, 14, stop block, 15, guide block two, 16, limit block, 17, gear, 18, positioning pin, 41, ejector rod one, 42, ejector rod two, 43, return rod, 101, T-shaped clamping groove. DETAILED DESCRIPTION

[0018] The application will be further described below in connection with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not used to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content of the application, and these equivalent forms also fall within the scope of the appended claims.

[0019] Embodiments of the application relate to a device for solving the imbalance of ejection caused by the shrinkage of the riser of a low-pressure casting mold, as shown in Figures 1-4 The device comprises an upper mold 5 and a lower mold 6 stacked one above the other, the upper mold 5 is provided with an ejector plate assembly, the ejector plate assembly is provided with a riser and ejector device 1 and an ejector rod one 41 inserted into the mold cavity, the riser and ejector device 1 comprises a fixing block 11, the fixing block 11 is internally provided with a guide block one 12 and a guide block two 15 on both sides respectively, the guide block two 15 slides up and down within a certain range along the inner wall of the fixing block 11, the inner side of the guide block one 12 and the inner side of the guide block two 15 are both vertically provided with a rack, the guide block one 12 and the guide block two 15 are driven by a gear 17, the guide block one 12 synchronously slides up and down following the guide block two 15, the fixing block 11 is internally provided with a stop block 14 above the guide block two 15, the stop block 14 and the guide block two 15 are provided with a spring 13 therebetween, the lower end of the guide block one 12 is connected with a return rod 43, and the lower end of the guide block two 15 is connected with an ejector rod two 42.

[0020] As a structure description of the ejector plate assembly, the ejector plate assembly comprises an ejector plate 2 and an ejector rod fixing plate 3, the ejector rod fixing plate 3 is installed at the lower end of the ejector plate 2, the ejector rod 41 is fixed at the lower end of the ejector plate 2 through the ejector rod fixing plate 3, and the ejector rod fixing plate 3 and the ejector plate 2 are connected and fixed by fasteners, which are generally bolts or screws.

[0021] As an installation description of the fixing block 11, the fixing block 11 is in a T-shaped block structure, the two side protrusions of the upper part of the fixing block 11 are buckled on the ejector plate 2 and are fixed by screws 10.

[0022] As a connection description of the guide block one 12 and the guide block two 15, refer to Figure 3 and Figure 4As shown, the lower end of the guide block one 12 and the lower end of the guide block two 15 are both provided with a T-shaped clamping groove 101, which is used for clamping the return rod 43 or the top rod two 42. The cap part on the upper end of the return rod 43 or the cap part on the upper end of the top rod two 42 is buckled into the T-shaped clamping groove 101 to realize clamping and fixing of the two, which is convenient for later maintenance and replacement.

[0023] As a preferred scheme of the guide block two 15, a long slot is formed on one side of the guide block two 15, and the front end of the fixed block 11 is inserted into a limiting block 16 located in the long slot. Through cooperation of the limiting block 16 and the long slot, the guide block two 15 is realized to slide up and down within a certain range.

[0024] The inner wall of the fixed block 11 and the stop block 14 are fixed through a positioning pin 18.

[0025] As a preferred scheme of the gear 17, there are two gears 17, which are arranged in a staggered manner and meshed together. The upper gear 17 is meshed with the rack on the side of the guide block two 15, and the lower gear 17 is meshed with the rack on the side of the guide block one 12. Of course, the number of gears 17 can be adjusted as needed, as long as the guide block one 12 can be realized to slide up and down synchronously with the guide block two 15.

[0026] As a preferred scheme of the guide block two 15, a spring cavity for accommodating the spring 13 is formed on the upper end of the guide block two 15, which is in a circular groove structure. The position of the lower part of the spring 13 is limited through the spring cavity to prevent the spring 13 from moving randomly. The spring 13 can be completely retracted into the spring cavity.

[0027] The ejection stage: after the mold is opened, that is, the upper and lower molds are separated, the guide block two 15 and the top rod two 42 are pushed downward by the spring force of the spring 13 due to the shrinkage of the riser 9, so that the lower part of the top rod two 42 still abuts against the bottom of the riser 9. Then the top plate assembly controls the top rod one 41 and the top rod two 42 to eject, the top rod one 41 ejects the casting 7, and the top rod two 42 ejects the riser 9. The riser 9 and the casting 7 are synchronized to demold, avoiding tilting or jamming caused by shrinkage difference.

[0028] The reset stage: when the mold is closed, the lower mold 6 pushes the return rod 43 and the guide block one 12 to move upward, and the guide block two 15 is reset through linkage of the gear 17, and the top rod two 42 is retracted to the initial position. The spring 13 is in an energy storage and compression state, preparing for the next ejection.

[0029] The present application designs a riser following top device 1 to replace the traditional ejection mechanism, after the riser 9 shrinks, the second ejector rod 42 is followed by the riser 9 under the action of the spring 13; when ejecting, the lower part of the second ejector rod 42 has been pressed against the riser 9, at this time, the riser 9 is ejected together with the casting 7, and the problem of ejection lag caused by the shrinkage of the riser 9 is solved; when the mold is closed, the return rod 43 is pushed downward by the lower mold 6, the guide block one 12 is pushed upward, the guide block two 15 is retracted upward at the same time under the linkage of the two gears 17, and the second ejector rod 42 is pulled back to the original position, and the problem of the return of the ejector rod is solved.

[0030] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0031] In order to facilitate the description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0032] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the protection scope of the present application.

[0033] The above describes in detail the device for solving the imbalance of ejection caused by the shrinkage of the riser of the low-pressure casting mold provided by the application. The principles and implementation manners of the application are described by using specific examples. The above description of the examples is only used to help understand the method of the application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. A device for solving the problem of ejection imbalance caused by riser shrinkage in a low-pressure casting mold, comprising an upper mold (5) and a lower mold (6) stacked one above the other, characterized in that: A top plate assembly is provided above the upper mold (5), and a riser follow-up device (1) and a top rod (41) inserted into the mold cavity are installed on the top plate assembly. The riser follow-up device (1) includes a fixed block (11), and a guide block (12) and a guide block (15) are installed on both sides of the interior of the fixed block (11). The guide block (15) slides up and down within a certain range along the inner wall of the fixed block (11), and the inner side of the guide block (12) and the inner side of the guide block (15) are both vertically arranged. There is a rack, and the guide block 1 (12) and the guide block 2 (15) are driven by a gear (17). The guide block 1 (12) synchronously follows the guide block 2 (15) to slide up and down. A stopper (14) is installed above the guide block 2 (15) inside the fixed block (11), and a spring (13) is installed between the stopper (14) and the guide block 2 (15). The lower end of the guide block 1 (12) is connected to a return rod (43), and the lower end of the guide block 2 (15) is connected to a push rod 2 (42).

2. The device for solving the problem of ejection imbalance caused by riser shrinkage in low-pressure casting molds according to claim 1, characterized in that: The top plate assembly comprises a top plate (2) and a top rod fixing plate (3), the top plate (2) is provided with a top rod fixing plate (3), the top rod (41) is fixed to the lower end of the top plate (2) via the top rod fixing plate (3), and the top plate (2) is connected and fixed by fasteners.

3. The device for solving the problem of ejection imbalance caused by riser shrinkage in low-pressure casting molds according to claim 2, characterized in that: The fixing block (11) is a T-shaped block structure, and the protrusions on both sides of the upper part of the fixing block (11) are buckled on the top plate (2) and fixed with screws (10).

4. The device for solving the problem of ejection imbalance caused by riser shrinkage in low-pressure casting molds according to claim 1, characterized in that: The lower ends of the guide block 1 (12) and the guide block 2 (15) are both provided with T-shaped slots (101), and the T-shaped slots (101) are used for clamping the return rod (43) or the top rod 2 (42).

5. The device for solving the problem of ejection imbalance caused by riser shrinkage in low-pressure casting molds according to claim 1, characterized in that: A long notch is provided on one side of the second guide block (15), and a limiting block (16) is inserted into the front end of the fixed block (11), and the limiting block (16) is located in the long notch.

6. The device for solving the problem of ejection imbalance caused by riser shrinkage in a low-pressure casting mold according to claim 1, characterized in that: The inner wall of the fixing block (11) and the stop block (14) are fixed via a positioning pin (18).

7. The device for solving the problem of ejection imbalance caused by riser shrinkage in a low-pressure casting mold according to claim 1, characterized in that: There are two gears (17) in total. The two gears (17) are staggered and meshed together. The upper gear (17) meshes with the rack on the side of the second guide block (15), and the lower gear (17) meshes with the rack on the side of the first guide block (12).

8. The device for solving the problem of ejection imbalance caused by riser shrinkage in a low-pressure casting mold according to claim 1, characterized in that: The upper end of the second guide block (15) is provided with a spring chamber for accommodating the spring (13), and the spring chamber is in a circular groove structure.

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