Lifting lug structure for mold lifting

Abstract

An exemplary mold hoist lug structure includes a pair of lugs protruding from a mold and spaced apart from each other and a hoist pin removably mounted on the pair of lugs, where the hoist pin includes: a body having a first end surface and a second end surface; a fixing ring fixed to the main body; and a stop ring configured to be movable between the main body and the fixed ring in a radial direction of the main body, in which each of the pair of lugs includes a through hole configured to allow passage of the main body of the lifting pin, the fixed ring, and the stop ring.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0088444, filed on Jul. 7, 2023, which is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a die lifting lug structure. Background Art

[0004] The mold may have a lifting lug attached adjacent to each edge thereof, and a lifting pin may be detachably mounted on the lifting lug. The end portion of the cable or wire may be connected to the lifting pin. A crane or a trolley may be connected to the wire, and the mold may be moved up and down or reversed by the movement of the crane or the trolley. The weight of the mold may be relatively heavy (e.g., 10-30 tons), and when the mold moves up and down or reverses, the load may be concentrated on the lifting pin, so the lifting pin is considered to be an important component to ensure safety during mold movement.

[0005] The jacking pin may be divided into a ring type jacking pin having a stop ring and a fixing ring provided at one end portion of a body, and a stop type jacking pin having a stopper and a stop groove.

[0006] When the mold is reversed, the annular lifting pin according to the related art may be released arbitrarily from the lifting lug, so the mold may fall. In addition, when the annular lifting pin of the related art is manually released from the lifting lug by a worker, safety accidents of the worker may frequently occur.

[0007] The stopper type jack pin according to the related art may cause the wire material to be damaged due to the stopper groove. When the die is reversed, the load may be concentrated between the die and the gripping portion of the jack pin, so that the gripping portion may be easily damaged.

[0008] Furthermore, the jack pin of the related art may be arbitrarily released from the lifting eye due to vibration acting on the mold in a state where the jack pin is mounted on the lifting eye.

[0009] The above information described in this Background section is provided to help understanding the background of the present inventive concept and may include any technical concept that is not considered to be prior art known to one skilled in the art. Summary of the invention

[0010] The present disclosure relates to a mold lifting lug structure. Certain embodiments relate to a mold lifting lug structure designed to allow a lifting pin to be detachably mounted on a lifting lug of a mold in an easy and safe manner.

[0011] The embodiments of the present disclosure can solve the problems occurring in the prior art while keeping the advantages achieved by the prior art intact.

[0012] Embodiments of the present disclosure provide a mold lifting lug structure designed to allow a lifting pin to be detachably mounted on a lifting lug of a mold in an easy and safe manner, thereby improving work safety and ease of use.

[0013] According to an embodiment of the present disclosure, a mold lifting lug structure may include: a pair of lifting lugs protruding from the mold and spaced apart from each other; and a lifting pin detachably mounted on the pair of lifting lugs. The lifting pin may include: a body having a first end surface and a second end surface; a fixing ring fixed to the body; and a stop ring configured to be movable in a radial direction of the body between the body and the fixing ring. Each lifting lug may have a through hole that allows the body, the fixing ring, and the stop ring of the lifting pin to pass through.

[0014] The outer diameter of the body may be substantially the same as the inner diameter of the through hole, and the outer diameter of the retaining ring and the outer diameter of the stop ring may be substantially the same as the outer diameter of the body.

[0015] The body may include a support protrusion protruding from the first end surface and a fixing protrusion protruding from the support protrusion. The stop ring may be elastically supported to the support protrusion by a coil spring.

[0016] The central longitudinal axis of the support extension may be aligned with the central longitudinal axis of the retaining extension, and the central longitudinal axis of the support extension may be aligned with the central longitudinal axis of the retaining ring and the central longitudinal axis of the body.

[0017] Due to the spring force of the coil spring, the central longitudinal axis of the stop ring may be eccentrically offset relative to the central longitudinal axis of the body.

[0018] When an external force greater than the spring force of the coil spring acts radially inward on the stop ring, the central longitudinal axis of the stop ring may be aligned with the central longitudinal axis of the body.

[0019] The coil spring may include an inner coiled portion wound around an outer surface of the support extension and an outer coiled portion at least partially contacting an inner surface of the stop ring. The center of curvature of the inner coiled portion may be aligned with the center of the support extension, and the center of curvature of the outer coiled portion may be spaced apart from the center of the support extension.

[0020] The support extension may have a predetermined knurl pattern disposed on an outer surface thereof, and the inner winding portion of the coil spring may frictionally contact the knurl pattern of the support extension.

[0021] The coil spring may have a tip bent from an inner end thereof, and the support protrusion may have a recess receiving the tip.

[0022] The mold lifting lug structure may further include a gripping portion secured to the second end surface of the body.

[0023] The grip portion may have a stop surface protruding outwardly from the second end surface of the body.

[0024] The mold lifting eye structure may further include a pressure block protruding from an outer surface of at least one of the pair of eyes. The pressure block may have a pressure surface that allows contact with the stop ring.

[0025] The radius of the pressing surface may be substantially the same as the radius of the stop ring.

[0026] The embodiments of the present invention may be described using the following elements in conjunction with the drawings.

[0027] 10 Mould lifting lug structure

[0028] 11 First lifting lug

[0029] 11a First through hole

[0030] 12 Second lifting lug

[0031] 12a Second through hole

[0032] 13 Briquetting

[0033] 13a Pressed surface

[0034] 20 Lifting Pin

[0035] 21 Subject

[0036] 22 Fixing ring

[0037] 23 Snap ring

[0038] 24a Internal winding section

[0039] 24b External winding portion

[0040] 24 Coil spring

[0041] 26 Support extension

[0042] 27 Fixed extension BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and other objects, features and advantages of the embodiments of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0044] Figure 1A perspective view of a mold lifting lug structure according to an exemplary embodiment of the present disclosure is shown;

[0045] Figure 2 A lifting pin of a mold lifting lug structure according to an exemplary embodiment of the present disclosure is shown;

[0046] Figure 3 A jacking pin of a mold jacking lug structure is shown with a retaining ring and a stop ring removed therefrom according to an exemplary embodiment of the present disclosure;

[0047] Figure 4 A coil spring of a mold lifting lug structure according to an exemplary embodiment of the present disclosure is shown;

[0048] Figure 5 Shown along Figure 2 A cross-sectional view taken along line AA in FIG.

[0049] Figure 6 Shows Figure 5 A variation of the exemplary embodiment shown in;

[0050] Figure 7 A stop ring of a mold lifting lug structure according to an exemplary embodiment of the present disclosure is shown;

[0051] Figure 8 A fixing ring of a mold lifting lug structure according to an exemplary embodiment of the present disclosure is shown;

[0052] Fig. 9 The following state is shown: in the mold lifting lug structure according to the exemplary embodiment of the present disclosure, when the stop ring of the lifting pin is eccentrically biased upward relative to the main body and the fixing ring of the lifting pin, the stop ring of the lifting pin is locked to the first lifting lug;

[0053] Fig.10 The following state is shown: in the mold lifting lug structure according to the exemplary embodiment of the present disclosure, when the stop ring of the lifting pin is eccentrically biased downward relative to the main body of the lifting pin and the fixing ring, the stop ring of the lifting pin is locked to the first lifting lug; and

[0054] Fig.11 The following state is shown: in the mold lifting ear structure according to an exemplary embodiment of the present disclosure, when the stop ring of the lifting pin contacts the pressing surface of the pressure block of the first lifting ear, the stop ring of the lifting pin is aligned with the main body and the fixing ring of the lifting pin. DETAILED DESCRIPTION

[0055] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used throughout the text to refer to the same or equivalent elements. In addition, detailed descriptions of known technologies associated with the present disclosure will be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure.

[0056] Terms such as first, second, A, B, (a) and (b) can be used to describe the elements in the exemplary embodiments of the present disclosure. These terms are only used to distinguish an element from another element, and the inherent characteristics, sequence or order of the corresponding element, etc. are not limited by these terms. Unless otherwise defined, all terms used in this article (including technical or scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the field to which the present disclosure belongs. Those terms as defined in commonly used dictionaries should be interpreted as having the meaning equal to the contextual meaning in the relevant field, and should not be interpreted as having an ideal or overly formal meaning, unless clearly defined as such in the present application.

[0057] refer to Figure 1 The mold lifting lug structure 10 according to an exemplary embodiment of the present disclosure may include a pair of lugs protruding from the mold 1 and a lifting pin 20 detachably mounted on the pair of lugs 11 and 12 .

[0058] refer to Figure 1 , a pair of ears may include a first ear 11 and a second ear 12 spaced apart from the first ear 11. The first ear 11 may have a first through hole 11a, and the second ear 12 may have a second through hole 12a. The second through hole 12a of the second ear 12 may be aligned with the first through hole 11a of the first ear 11. The diameter of the first through hole 11a may be the same as the diameter of the second through hole 12a, and the central longitudinal axis of the first through hole 11a may be aligned with the central longitudinal axis of the second through hole 12a.

[0059] The lifting pin 20 can be inserted into the first through hole 11a of the first lifting ear 11 and the second through hole 12a of the second lifting ear 12, so that the middle part of the lifting pin 20 can be exposed through the gap between the first lifting ear 11 and the second lifting ear 12, and the cable or wire 3 can be wrapped around the middle part of the lifting pin 20.

[0060] refer to Figure 2 The lifting pin 20 may include: a main body 21; a fixing ring 22 fixed to the main body 21; and a stop ring 23 configured to be movable between the main body 21 and the fixing ring 22 along the radial direction of the main body 21.

[0061] The cylindrical shape of the body 21 may have a predetermined length L and a predetermined outer diameter d1, and the outer diameter d1 of the body 21 may be substantially the same as the inner diameter of the first through hole 11a and the inner diameter of the second through hole 12a. Figure 3 , the body 21 may have a first end surface 21a and a second end surface 21b opposite to each other. The body 21 may have a support extension 26 protruding from the first end surface 21a of the body 21 by a predetermined length, and the central longitudinal axis of the support extension 26 may be aligned with the central longitudinal axis X1 of the body 21. The body 21 may have a fixing extension 27 protruding from the support extension 26 by a predetermined length, and the central longitudinal axis of the fixing extension 27 may be aligned with the central longitudinal axis of the support extension 26 and the central longitudinal axis X1 of the body 21. The outer diameter d5 of the fixing extension 27 may be smaller than the outer diameter d4 of the support extension 26.

[0062] The fixing ring 22 may be fixed to the fixing protrusion 27. The central longitudinal axis of the fixing protrusion 27 may be aligned with the central longitudinal axis X2 of the fixing ring 22, and the central longitudinal axis X2 of the fixing ring 22 may be aligned with the central longitudinal axis X1 of the body 21. Figure 8 The fixing ring 22 may have a predetermined outer diameter d2 and a predetermined inner diameter d7. The outer diameter d2 of the fixing ring 22 may be substantially the same as the outer diameter d1 of the body 21, and the inner diameter d7 of the fixing ring 22 may be the same as the outer diameter d5 of the fixing extension 27. According to an exemplary embodiment, the inner surface of the fixing ring 22 may be formed by CO 2 The fixing ring 22 is welded and fixed to the outer surface of the fixing protrusion 27, so that the welding strength between the fixing ring 22 and the fixing protrusion 27 can be increased. In addition, the fixing ring 22 may have a tapered surface 22b provided on its outer surface. When the lifting pin 20 is inserted into the second through hole 12a of the second lifting eye 12 and the first through hole 11a of the first lifting eye 11, the tapered surface 22b may allow the fixing ring 22 to be smoothly inserted into the second through hole 12a of the second lifting eye 12 and the first through hole 11a of the first lifting eye 11.

[0063] The stop ring 23 can be elastically supported on the support extension 26 of the main body 21 by the coil spring 24, and the central longitudinal axis X3 of the stop ring 23 can be eccentrically offset relative to the central longitudinal axis X1 of the main body 21 and the central longitudinal axis X2 of the fixing ring 22 due to the spring force of the coil spring 24. In addition, when an external force greater than the spring force of the coil spring 24 acts on the stop ring 23 inwardly in the radial direction, the central longitudinal axis X3 of the stop ring 23 can be aligned with the central longitudinal axis X1 of the main body 21 and the central longitudinal axis X2 of the fixing ring 22.

[0064] refer to Figure 7, the stop ring 23 may have a predetermined outer diameter d3 and a predetermined inner diameter d6. The outer diameter d3 of the stop ring 23 may be substantially the same as the outer diameter d1 of the body 21, and the inner diameter d6 of the stop ring 23 may be greater than the outer diameter d4 of the support protrusion 26. In addition, the stop ring 23 may have a tapered surface 23b provided on an outer surface thereof. When the lifting pin 20 is inserted into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11, the tapered surface 23b may allow the stop ring 23 to be smoothly inserted into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11.

[0065] refer to Figure 4 , the coil spring 24 may have an inner end 24d and an outer end 24f. The coil spring 24 may include an inner winding portion 24a and an outer winding portion 24b continuously connected to the inner winding portion 24a. The center of curvature C2 of the outer winding portion 24b may be spaced apart from the center of curvature C1 of the inner winding portion 24a by a predetermined vertical distance S1 and a predetermined horizontal distance S2. In addition, the coil spring 24 may include a bent portion 24c bent from the outer winding portion 24b. The center of curvature C3 of the bent portion 24c may be spaced apart from the center of curvature C2 of the outer winding portion 24b. The radius of curvature of the outer winding portion 24b may be slightly greater than or equal to the radius of curvature of the stop ring 23.

[0066] refer to Figure 5 , the inner winding portion 24a of the coil spring 24 may be wound around the outer surface of the support protrusion 26 of the body 21, and the outer winding portion 24b of the coil spring 24 may at least partially contact the inner surface 23a of the stop ring 23. The center of curvature C1 of the inner winding portion 24a may be aligned with the center of the support protrusion 26, and the center C5 of the stop ring 23 may be spaced apart from the center of the support protrusion 26. Therefore, the center C5 of the stop ring 23 may be eccentrically offset relative to the center of the body 21 due to the coil spring 24.

[0067] When an external force that overcomes the spring force of the coil spring 24 is applied radially inward to the stop ring 23, the outer winding portion 24b of the coil spring 24 can be contracted toward the center of the support protrusion 26, and thus the center C5 of the stop ring 23 can be aligned with the center of the support protrusion 26. Thus, the central longitudinal axis X3 of the stop ring 23 can be forcibly aligned with the central longitudinal axis X1 of the body 21 and the central longitudinal axis X2 of the fixing ring 22 by the external force. When the lifting pin 20 passes through the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11 in sequence, the stop ring 23 can contact the inner surface of the second through hole 12a of the second lifting ear 12, the inner surface of the first through hole 11a of the first lifting ear 11, and the pressing surface 13a of the pressing block 13, so that the outer winding portion 24b of the coil spring 24 can be contracted toward the center of the support protrusion 26. Therefore, the center C5 of the stop ring 23 may be aligned with the center of the support protrusion 26 so that the central longitudinal axis X3 of the stop ring 23 may be aligned with the central longitudinal axis X1 of the body 21 and the central longitudinal axis X2 of the fixing ring 22 .

[0068] refer to Figure 3 and Figure 5 , the support extension 26 may have a predetermined knurl pattern formed on its outer surface. The inner surface and / or the inner end 24d of the coil spring 24 may frictionally contact the knurl pattern, so that the inner surface and / or the inner end 24d of the coil spring 24 may be prevented from sliding in the rotation direction on the outer surface of the support extension 26. Therefore, the coil spring 24 may be prevented from sliding in the rotation direction between the outer surface of the support extension 26 and the inner surface 23a of the stop ring 23.

[0069] According to an alternative exemplary embodiment, Figure 6 As shown, the coil spring 24 may have a tip 24e bent from the inner end 24d, and the support protrusion 26 may have a recess in which the tip 24e of the coil spring 24 is received. When the tip 24e of the coil spring 24 is inserted into the recess of the support protrusion 26, the inner winding portion 24a of the coil spring 24 may be fixed to the support protrusion 26, and thus the coil spring 24 can be prevented from sliding in the rotation direction between the outer surface of the support protrusion 26 and the inner surface 23a of the stop ring 23.

[0070] The lifting pin 20 may be inserted into the second through hole 12a of the second lifting eye 12 and the first through hole 11a of the first lifting eye 11, so that the lifting pin 20 may be mounted on the second lifting eye 12 and the first lifting eye 11. In a state where the lifting pin 20 is mounted on the second lifting eye 12 and the first lifting eye 11, the second end surface 21b of the body 21 may be exposed from the second through hole 12a of the second lifting eye 12, and the first end surface 21a of the body 21 may be exposed from the first through hole 11a of the first lifting eye 11.

[0071] refer to Figure 2 and Figure 3 The lifting pin 20 may have a gripping portion 25 fixed to the second end surface 21b of the body 21, and the gripping portion 25 may be provided by CO 2 The gripping portion 25 may be fixed to the second end surface 21b of the body 21 by welding or the like. The gripping portion 25 may have a stopper surface 25a protruding outward from the second end surface 21b of the body 21. When the jacking pin 20 is inserted into the second through hole 12a of the second lifting eye 12, the stopper surface 25a may be stopped against the second lifting eye 12, so that the gripping portion 25 may be prevented from being inserted into the second through hole 12a of the second lifting eye 12.

[0072] refer to Figure 1 , Fig. 9 , Fig.10 and Fig.11 , the first lifting ear 11 may have a pressing block 13, and the pressing block 13 may protrude from the outer surface of the first lifting ear 11. According to an exemplary embodiment, the pressing block 13 and the first lifting ear 11 may form an integral one-piece structure. According to another exemplary embodiment, the pressing block 13 may be provided separately from the first lifting ear 11, and the pressing block 13 may be fixed to the outer surface of the first lifting ear 11 using fasteners, welding, etc.

[0073] The pressing block 13 may be disposed toward the center of the first through hole 11a of the first lifting lug 11 and may be positioned to match a portion of the outer peripheral surface of the first through hole 11a of the first lifting lug 11. For example, the pressing block 13 may be located on an upper portion of the outer peripheral surface of the first through hole 11a of the first lifting lug 11.

[0074] The pressing block 13 may have a pressing surface 13a that matches a portion of the outer peripheral surface of the stop ring 23. When the jacking pin 20 rotates and moves, this portion of the outer peripheral surface of the stop ring 23 of the jacking pin 20 may contact the pressing surface 13a, so that the stop ring 23 may be pressed toward the center of the body 21 of the jacking pin 20 by the pressing surface 13a. The radius of the pressing surface 13a may be the same as the radius of the first through hole 11a and the radius of the stop ring 23, or may be slightly larger than the radius of the first through hole 11a and the radius of the stop ring 23. That is, the radius of the pressing surface 13a may also be substantially the same as the radius of the first through hole 11a and the radius of the stop ring 23.

[0075] When the worker grasps the gripping portion 25 and pushes the lifting pin 20 in the locking direction into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11, the lifting pin 20 can be inserted into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11. Specifically, when the worker pushes the lifting pin 20 into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11, the worker can rotate the lifting pin 20 around the central longitudinal axis X1 of the body 21, so that the lifting pin 20 can be more easily inserted into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11.

[0076] Fig. 9 A state is shown in which the stop ring 23 of the jacking pin 20 is locked to the first lifting eye 11 when the stop ring 23 of the jacking pin 20 is eccentrically biased upward from the main body 21 and the fixing ring 22 .

[0077] When the lifting pin 20 is fully inserted into the second through hole 12a of the second lifting ear 12 and the first through hole 11a of the first lifting ear 11, the first end surface 21a of the body 21 of the lifting pin 20 can be fully exposed from the first through hole 11a of the first lifting ear 11, and the second end surface 21b of the body 21 of the lifting pin 20 can be exposed from the second through hole 12a of the second lifting ear 12. Fig. 9 , the first end surface 21a of the body 21 can be completely exposed from the first through hole 11a of the first lifting ear 11, so that the central longitudinal axis X3 of the stop ring 23 can be eccentrically offset upward from the central longitudinal axis X1 of the body 21 and the central longitudinal axis X2 of the fixing ring 22. Therefore, the stop ring 23 of the lifting pin 20 can be locked to the pressure block 13 of the first lifting ear 11, and the lifting pin 20 can be firmly fixed to the second lifting ear 12 and the first lifting ear 11.

[0078] Fig.10 It is shown that the stop ring 23 of the jacking pin 20 is locked to the first lifting eye 11 when the stop ring 23 of the jacking pin 20 is eccentrically biased downwards from the body 21 and the fixing ring 22 .

[0079] refer to Fig.10 In a state where the first end surface 21a of the body 21 of the jacking pin 20 is exposed from the first through hole 11a of the first lifting ear 11, when the body 21 of the jacking pin 20 is rotated about its central longitudinal axis X1 by a predetermined angle, the central longitudinal axis X3 of the stop ring 23 can be eccentrically offset downward from the central longitudinal axis X1 of the body 21 and the central longitudinal axis X2 of the fixing ring 22. Therefore, the stop ring 23 of the jacking pin 20 can be locked to the outer surface of the first lifting ear 11, so that the jacking pin 20 can be firmly fixed to the second lifting ear 12 and the first lifting ear 11.

[0080] Fig.11 The following state is shown: when the stop ring 23 of the jacking pin 20 contacts the pressing surface 13 a of the pressing block 13 of the first lifting eye 11 , the stop ring 23 of the jacking pin 20 is aligned with the main body 21 and the fixing ring 22 .

[0081] refer to Fig.11 In a state where the first end surface 21a of the main body 21 of the jacking pin 20 is completely exposed from the first through hole 11a of the first lifting ear 11, when the main body 21 of the jacking pin 20 rotates about its central longitudinal axis X1 by a predetermined angle, the stop ring 23 of the jacking pin 20 can contact the pressing surface 13a of the pressing block 13, and the stop ring 23 can be pressed toward the supporting protrusion 26 by the pressing surface 13a of the pressing block 13, so that the central longitudinal axis X3 of the stop ring 23 can be aligned with the central longitudinal axis X1 of the main body 21 and the central longitudinal axis X2 of the fixing ring 22. Therefore, the stop ring 23 and the fixing ring 22 of the main body 21 of the jacking pin 20 can be easily released from the first through hole 11a of the first lifting ear 11. When the pressing block 13 of the first lifting ear 11 presses the stop ring 23, the stop ring 23 can be aligned with the main body 21 and the fixing ring 22. In this state, when a worker pulls the lifting pin 20 in a releasing direction, the lifting pin 20 may be completely released from the first lifting eye 11 .

[0082] As described above, according to an exemplary embodiment of the present disclosure, when the stop ring of the lifting pin is eccentrically biased relative to the body and the fixing ring due to the coil spring, the locking of the lifting pin and the lifting ear can be stably maintained, and the lifting pin can be prevented from being released from the lifting ear due to external force.

[0083] According to an exemplary embodiment of the present disclosure, when the stop ring of the jack pin is pressed by the pressure block provided on the lifting eye, the jack pin may be aligned with the body and the fixing ring, and thus the jack pin may be easily released from the lifting eye.

[0084] In the above, although the embodiments of the present disclosure have been described with reference to the exemplary embodiments and the accompanying drawings, the embodiments of the present disclosure are not limited thereto, and various modifications and changes may be made by those skilled in the art to which the present disclosure belongs without departing from the spirit and scope of the present disclosure as claimed in the appended claims.

Claims

1. A mold lifting lug structure, comprising: a pair of ears projecting from the mold and spaced apart from each other; as well as A lifting pin is detachably mounted on the pair of lifting ears, wherein the lifting pin comprises: a body having a first end surface and a second end surface; a fixing ring fixed to the main body; and A stop ring is configured to be movable between the main body and the fixing ring in a radial direction of the main body, wherein each of the pair of lifting ears includes a through hole configured to allow the main body of the lifting pin, the fixing ring and the stop ring to pass therethrough.

2. The mold lifting lug structure according to claim 1, wherein: The outer diameter of the body is substantially equal to the inner diameter of the through hole; and The outer diameter of the fixing ring and the outer diameter of the stop ring are substantially equal to the outer diameter of the main body.

3. The mold lifting lug structure according to claim 1, wherein: The body includes a support extension protruding from the first end surface and a fixing extension protruding from the support extension; and The stop ring is elastically supported to the support protrusion by a coil spring.

4. The mold lifting lug structure according to claim 3, wherein: The central longitudinal axis of the support extension is aligned with the central longitudinal axis of the fixed extension; and The central longitudinal axis of the retaining extension is aligned with the central longitudinal axis of the retaining ring and the central longitudinal axis of the body.

5. The mold lifting lug structure according to claim 3, wherein: Due to the spring force of the coil spring, the central longitudinal axis of the stop ring is eccentrically offset relative to the central longitudinal axis of the body.

6. The mold lifting lug structure according to claim 5, wherein: In a state where an external force greater than the spring force of the coil spring acts on the stop ring radially inwardly, a central longitudinal axis of the stop ring is aligned with a central longitudinal axis of the main body.

7. The mold lifting lug structure according to claim 3, wherein: The coil spring includes an inner coiled portion wound around an outer surface of the support extension and an outer coiled portion at least partially contacting an inner surface of the stop ring; The center of curvature of the inner winding is aligned with the center of the support extension; and A center of curvature of the outer winding is spaced apart from a center of the support extension.

8. The mold lifting lug structure according to claim 7, wherein: The support extension includes a predetermined knurling pattern on an outer surface of the support extension; and The inner coil of the coil spring is configured to frictionally contact the knurl pattern of the support extension.

9. The mold lifting lug structure according to claim 3, wherein: The coil spring includes a tip bent from an inner end of the coil spring; and The support extension includes a recess configured to receive the tip.

10. A mold lifting lug structure, the mold lifting lug structure comprising: a pair of lifting ears protruding from the mold and spaced apart from each other; as well as A lifting pin is detachably mounted on the pair of lifting ears, wherein the lifting pin comprises: a body having a first end surface and a second end surface; a grip portion fixed to the second end surface of the body; a fixing ring fixed to the main body; and A stop ring is configured to be movable between the main body and the fixing ring in a radial direction of the main body, wherein each of the pair of lifting ears includes a through hole configured to allow the main body of the lifting pin, the fixing ring and the stop ring to pass therethrough.

11. The mold lifting lug structure of claim 10, wherein the gripping portion includes a stop surface protruding outwardly from the second end surface of the body.

12. The mold lifting lug structure according to claim 10, wherein: The outer diameter of the body is substantially equal to the inner diameter of the through hole; and The outer diameter of the fixing ring and the outer diameter of the stop ring are substantially equal to the outer diameter of the body.

13. The mold lifting lug structure according to claim 10, wherein: The body includes a support extension protruding from the first end surface and a fixing extension protruding from the support extension; and The stop ring is elastically supported to the support protrusion by a coil spring.

14. A mold lifting lug structure, the mold lifting lug structure comprising: a pair of lifting ears protruding from the mold and spaced apart from each other; A lifting pin is detachably mounted on the pair of lifting ears, wherein the lifting pin comprises: a body having a first end surface and a second end surface; a fixing ring fixed to the main body; and a stop ring configured to be movable between the main body and the fixing ring in a radial direction of the main body, wherein each of the pair of lifting ears includes a through hole configured to allow the main body of the jacking pin, the fixing ring, and the stop ring to pass therethrough; and A pressing block protrudes from an outer surface of one of the pair of lifting ears, wherein the pressing block has a pressing surface configured to contact the retaining ring.

15. The mold lifting lug structure according to claim 14, wherein the radius of the pressing surface is substantially equal to the radius of the stop ring.

16. The mold lifting lug structure according to claim 14, wherein: The outer diameter of the body is substantially equal to the inner diameter of the through hole; and The outer diameter of the fixing ring and the outer diameter of the stop ring are substantially equal to the outer diameter of the body.

17. The mold lifting lug structure according to claim 14, wherein: The body includes a support extension protruding from the first end surface and a fixing extension protruding from the support extension; and The stop ring is elastically supported to the support protrusion by a coil spring.

18. The mold lifting lug structure according to claim 17, wherein: The coil spring includes an inner coiled portion wound around an outer surface of the support extension and an outer coiled portion at least partially contacting an inner surface of the stop ring; The center of curvature of the inner winding is aligned with the center of the support extension; and A center of curvature of the outer winding is spaced apart from a center of the support extension.

19. The mold lifting lug structure according to claim 18, wherein: The support extension includes a predetermined knurling pattern on an outer surface of the support extension; and The inner coil of the coil spring is configured to frictionally contact the knurl pattern of the support extension.

20. The mold lifting lug structure according to claim 17, wherein: The coil spring includes a tip bent from an inner end of the coil spring; and The support extension includes a recess configured to receive the tip.

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