Block pulling device for core box and core box

Abstract

The invention discloses a block pulling device for a core box and the core box, the block pulling device for the core box comprises at least two driving rods, each driving rod is connected to a movable block of the core box at intervals along a first direction, and the driving rods are used for being connected with a power source to drive the movable block to move along a second direction; the synchronous transmission assembly is in transmission connection with all the driving rods so that all the driving rods can synchronously move in the second direction; the floating connecting assembly is mounted between the driving rod and the movable block and is configured to allow the movable block to generate displacement in the first direction, the second direction and the third direction relative to the driving rod, so that thermal expansion of the movable block is compensated, blockage between the movable block and the driving rod is prevented, and the production stability and the yield are improved; wherein the first direction is parallel to the length direction of the movable block, and the first direction, the second direction and the third direction are perpendicular to one another.

Description

Technical Field

[0001] This invention relates to the field of sand core forming mold technology, and in particular to a block pulling device for a core box and a core box. Background Technology

[0002] Currently, in core boxes used for molding complex thin-walled castings such as engine cylinder blocks, elongated movable blocks are prone to thermal expansion and deformation during operation. Furthermore, due to their large length-to-diameter ratio, differences in expansion and deformation along the length occur during heating and repeated use, leading to inconsistent deformation at both ends and affecting the fitting accuracy of the movable blocks.

[0003] In related technologies, long, rectangular movable blocks are typically driven by dual or multiple cylinders to achieve mold closing. However, under dual or multiple cylinder drive conditions, deformation of the movable block can lead to difficulty in synchronous closing and locking, potentially causing casting defects such as incomplete mold closing and sand leakage, or even causing the movable block to jam or the guide mechanism to be damaged, seriously affecting production stability and yield. Summary of the Invention

[0004] One object of the present invention is to provide a block-pulling device for core boxes to solve or alleviate at least one of the defects in the above-mentioned background art.

[0005] Another object of the present invention is to provide a core box having the above-described block extraction device.

[0006] To achieve at least one of the above objectives, the technical solution adopted by the present invention is as follows: a block-pulling device for a core box, comprising: at least two drive rods, each drive rod being connected to a movable block of the core box at intervals along a first direction, the drive rods being connected to a power source to drive the movable block to move along a second direction; a synchronous transmission assembly, the synchronous transmission assembly being respectively connected to each of the drive rods to enable each drive rod to move synchronously along the second direction; and a floating connection assembly, the floating connection assembly being installed between the drive rods and the movable block, configured to allow the movable block to be displaced relative to the drive rods in the first direction, the second direction, and a third direction; wherein, the first direction is parallel to the length direction of the movable block, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0007] As a preferred embodiment, the synchronous transmission assembly includes at least two synchronous racks, at least two synchronous gears, and a synchronous shaft. Each synchronous rack is fixed to a corresponding drive rod, and each synchronous gear is spaced apart on the synchronous shaft along a first direction. The synchronous gears are used to mesh with the synchronous racks so that each drive rod moves synchronously along a second direction.

[0008] As a preferred embodiment, the block-pulling device for the core box further includes a gap adjustment assembly, which includes at least one of an axial adjustment member and a radial adjustment member; at least a portion of the axial adjustment member is clamped between the synchronous rack and the drive rod along a second direction, and / or between the drive rod and the power source along a second direction, thereby adjusting the relative position of the synchronous rack and the synchronous gear in the second direction; at least a portion of the radial adjustment member is clamped between the synchronous rack and the drive rod along a third direction, and / or between the drive rod and the power source along a third direction, thereby adjusting the relative position of the synchronous rack and the synchronous gear in the third direction.

[0009] As a preferred embodiment, the floating connection assembly includes a floating coupling for connecting the drive rod and the movable block; the drive rod has one of a transition portion and a receiving groove at one end near the floating coupling, and the floating coupling has the other of a transition portion and a receiving groove at one side near the drive rod, with the receiving groove and the transition portion having a clearance fit, so that the floating coupling is connected to the drive rod and allows the floating coupling to be displaced relative to the drive rod in the first direction, the second direction, and the third direction.

[0010] Preferably, the receiving groove is a "T"-shaped groove, and the width of the opening of the receiving groove is smaller than the width of the bottom of the groove; the adapter is a "T"-shaped structure to allow clearance fitting with the receiving groove; the floating connection assembly also includes a pin, which is used to connect the drive rod and the floating coupling; the adapter has a through hole, and the pin passes through the through hole; the diameter of the through hole is larger than the diameter of the pin to allow radial movement of the adapter relative to the pin; the length of the pin is greater than the width of the adapter along the axial direction of the pin to allow axial movement of the adapter relative to the pin.

[0011] As a preferred embodiment, the floating connection assembly includes a floating coupling, a floating fastener, and a floating adjuster. The floating coupling connects the drive rod and the movable block, and the floating fastener connects the floating coupling and the movable block. By adjusting the floating fastener, the opposing surfaces of the floating coupling and the drive rod are made parallel. The floating adjuster is clamped between the floating coupling and the movable block along a second direction, thereby keeping the floating coupling, the drive rod, and the movable block in contact.

[0012] As a preferred embodiment, the floating fastener includes a plurality of adjusting screws adapted to pass through holes in the movable block and be threadedly connected to the floating coupling. By adjusting the engagement length of each adjusting screw with the floating coupling, the relative position of the floating coupling and the movable block in a second direction can be adjusted, and the opposing surfaces of the floating coupling and the drive rod can be made parallel. The floating adjustment member is adapted to elastically deform in the second direction and is compressedly clamped between the floating coupling and the movable block. Within the compression adjustment range of the floating adjustment member, the total elastic force of the floating adjustment member is greater than or equal to the driving force of the power source, so as to keep the floating coupling, the drive rod, and the movable block in contact.

[0013] As a preferred embodiment, the block-pulling device for the core box further includes a heat insulation component, which includes at least one of a heat insulation plate and a heat dissipation base; the heat insulation plate is disposed between the drive rod and the movable block to isolate heat conduction between the drive rod and the movable block; the heat dissipation base is used to mount a power source, and the heat dissipation base has at least one of heat dissipation fins, a cooling air duct, and a cooling flow channel to dissipate heat from the power source.

[0014] To achieve at least one of the above objectives, the technical solution adopted by the present invention is as follows: a core box, comprising: at least one set of molds, the molds defining at least one cavity, the molds including at least one movable block; and a block-pulling device for the core box as described above, the block-pulling device being connected between a power source and the movable block, for driving the movable block to perform mold opening and closing actions.

[0015] As a preferred embodiment, the core box includes a locking assembly, which includes at least one of a first locking structure, a second locking structure, and a third locking structure; the first locking structure is used to maintain the driving force of the power source after the mold is closed; the second locking structure is fixed to the front or rear mold of the mold, and when the mold is closed, the second locking structure can wedge the movable block through a wedge-shaped surface; the third locking structure is movably mounted on the frame, and when the third locking structure is driven to move toward the movable block, it can wedge the movable block through a wedge-shaped surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The synchronous transmission assembly forces each drive rod to move synchronously in the second direction; at the same time, the floating connection assembly allows the movable block to move upward relative to the drive rod in the first, second, and third directions, thereby compensating for the thermal expansion of the movable block and preventing jamming between the movable block and the drive rod, thus improving production stability and yield. Attached Figure Description

[0017] Figure 1This is a front view of a block-pulling device according to some embodiments of this application, showing two drive rods connected to a movable block.

[0018] Figure 2 This is a schematic diagram of the two drive rods of the block-pulling device according to some embodiments of this application connected to the side of the movable block.

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0021] Figure 5 This is a schematic diagram of a drive rod of a block-pulling device according to some embodiments of the present application connected to the side of a movable block.

[0022] Figure 6 yes Figure 5 Enlarged view of point C in the middle.

[0023] Figure 7 yes Figure 5 Enlarged view of point D in the middle.

[0024] Figure 8 This is a front view of a drive rod connected to a floating connection assembly according to some embodiments of this application.

[0025] Figure 9 yes Figure 8 Enlarged view of point E in the middle.

[0026] Figure 10 This is a cross-sectional view of a drive rod connected to a floating coupling according to some embodiments of this application.

[0027] Figure 11 This is a cross-sectional view of a floating coupling connected to a movable block according to some embodiments of this application.

[0028] Figure 12 This is a schematic diagram of a chip box according to some embodiments of this application.

[0029] Figure 13 yes Figure 12 Enlarged view of point F in the middle.

[0030] In the diagram: 1. Block pulling device; 10. Drive rod; 11. Adjusting groove; 12. Connector; 121. Through hole; 20. Synchronous transmission assembly; 21. Synchronous rack; 211. Adjusting protrusion; 22. Synchronous gear; 23. Synchronous shaft; 24. Pressure rod; 30. Clearance adjustment assembly; 31. Axial adjustment component; 32. Radial adjustment component; 33. Clamping adjustment component; 40. Floating connection assembly; 41. Floating coupling; 411. Receiving groove; 42. Pin; 43. Floating fastener; 431, Adjusting screw; 44, Floating adjusting component; 441, Disc spring; 50, Heat insulation assembly; 51, Heat insulation plate; 511, First heat insulation plate; 512, Second heat insulation plate; 52, Heat dissipation base; 521, Fixing part; 522, Heat dissipation part; 2, Core box; 60, Mold; 61, Movable block; 70, Locking assembly; 71, Second locking structure; 72, Third locking structure; 80, Heavy-duty connector; 90, Power source; 91, Piston coupling. Detailed Implementation

[0031] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] In the description of this invention, it should be noted that directional terms such as "center," "lateral," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection, a contact connection, or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] A block-pulling device 1 for a core box, such as Figure 1-13 As shown, the device includes at least two drive rods 10, a synchronous transmission assembly 20, and a floating connection assembly 40. Specifically, each drive rod 10 is connected to a movable block 61 of the core box 2 at intervals along a first direction. The drive rod 10 is connected to a power source 90 to drive the movable block 61 to move along a second direction. The synchronous transmission assembly 20 is driven by each drive rod 10 to enable the drive rods 10 to move synchronously along the second direction. The floating connection assembly 40 is installed between the drive rods 10 and the movable block 61 and is configured to allow the movable block 61 to be displaced relative to the drive rods 10 in the first, second, and third directions. The first direction is parallel to the length direction of the movable block 61, and the first, second, and third directions are perpendicular to each other.

[0036] It is understandable that without the synchronous transmission component 20, each drive rod 10 moves independently, and the movement direction between the movable block 61 and the frame of the core box 2 relies solely on the cooperation of the guide key and guide groove, which can easily lead to asynchronous movement of the drive rods 10. Especially when the length of the movable block 61 is large, it may even tilt during mold opening and closing, causing severe friction, jamming, or even complete blockage between the guide key and guide groove. If the driving force is forcibly increased, although the mold closing action can be completed, the guide key and guide groove will wear down during long-term use, resulting in a decrease in the fitting accuracy. This can cause the movable block 61 to shift during mold closing, affecting the yield of the sand core.

[0037] In this embodiment, such as Figure 1 As shown, the synchronous transmission assembly 20 forces each drive rod 10 to move synchronously along the second direction, which helps to avoid tilting of the movable block 61 during mold opening and closing, reduces the risk of wear on the guide key and guide groove, and helps to improve the tightness of the mold closing. At the same time, the floating connection assembly 40 allows the movable block 61 to move upward relative to the drive rod 10 in the first, second, and third directions, which compensates for the thermal expansion of the movable block 61 and helps to prevent jamming between the movable block 61 and the drive rod 10, thereby improving production stability and yield.

[0038] In some embodiments, such as Figure 2 and Figure 3 As shown, the synchronous transmission assembly 20 includes at least two synchronous racks 21, at least two synchronous gears 22, and a synchronous shaft 23. Each synchronous rack 21 is fixed on a corresponding drive rod 10, and each synchronous gear 22 is spaced apart on the synchronous shaft 23 along a first direction. The synchronous gears 22 are used to mesh with the synchronous racks 21 so that each drive rod 10 moves synchronously along a second direction, thereby helping to avoid defects such as poor mold closing and sand leakage caused by the tilting of the movable block 61 during mold closing.

[0039] It should be understood that, compared to complex servo hydraulic systems, in this embodiment, the mechanical coupling of the synchronous gears 22 and the synchronous rack 21 forces each drive rod 10 to move synchronously. In other words, when there is a tendency for inconsistent movement speeds among the drive rods 10, the synchronous transmission assembly 20 can play an auxiliary adjustment role, so that the movement speeds of each drive rod 10 tend to be consistent again. This achieves high synchronization accuracy with lower production and maintenance costs, helps to avoid tilting of the moving block 61, improves the tightness of the film, and reduces the risk of wear on the guide key and guide groove. Especially when applied to harsh working environments such as the core box 2, the mechanical coupling of the synchronous gears 22 and 22 is less sensitive to dust and high temperatures, which helps to improve the reliability of the block-pulling device 1 and extend its service life.

[0040] It is worth mentioning that those skilled in the art can adjust the mounting method between the synchronous rack 21 and the drive rod 10, the mounting method between the synchronous gear 22 and the synchronous shaft 23, and the mounting method of the synchronous shaft 23 according to actual design requirements. Such adjustments all fall within the protection scope of this application. For example, the synchronous rack 21 and the drive rod 10 are connected by fasteners or integrally formed, the synchronous gear 22 and the synchronous shaft 23 are connected by a key or spline, and the synchronous shaft 23 is mounted on the frame of the core box 2 by bearings.

[0041] In some embodiments, such as Figures 2-7 As shown, the block-pulling device 1 for the core box further includes a gap adjustment assembly 30, which includes at least one of an axial adjustment member 31 and a radial adjustment member 32. At least a portion of the axial adjustment member 31 is clamped between the synchronous rack 21 and the drive rod 10 along a second direction, and / or between the drive rod 10 and the power source 90 along a second direction, thereby adjusting the relative position of the synchronous rack 21 and the synchronous gear 22 in the second direction. At least a portion of the radial adjustment member 32 is clamped between the synchronous rack 21 and the drive rod 10 along a third direction, and / or between the drive rod 10 and the power source 90 along a third direction, thereby adjusting the relative position of the synchronous rack 21 and the synchronous gear 22 in the third direction.

[0042] It should be understood that the axial adjusting member 31 and the radial adjusting member 32 can improve the assembly accuracy between the synchronous rack 21 and the synchronous gear 22, and further improve the synchronicity of the movement of each drive rod 10. In addition, during long-term use of the block-pulling device 1, the tooth surfaces of the synchronous rack 21 and the synchronous gear 22 will wear. The radial adjusting member 32 can readjust the radial clearance between the synchronous rack 21 and the synchronous gear 22, thereby extending the service life of the block-pulling device 1 and helping to ensure the long-term stability and reliability of the block-pulling device 1.

[0043] In at least one embodiment, such as Figure 6 As shown, the synchronizing rack 21 is detachably connected to the drive rod 10 by fasteners. One of an adjusting groove 11 and an adjusting protrusion 211 is provided on the side of the synchronizing rack 21 facing the drive rod 10, and the other of an adjusting groove 11 and an adjusting protrusion 211 is provided on the side of the drive rod 10 facing the synchronizing rack 21. Along the axial direction of the synchronizing rack 21, the size of the adjusting groove 11 is larger than the size of the adjusting protrusion 211, allowing the adjusting protrusion 211 to move within the adjusting groove 11 along the axial direction of the synchronizing rack 21, i.e., along the second direction, thereby adjusting the relative position of the synchronizing rack 21 and the synchronizing gear 22 in the second direction. Furthermore, the axial adjustment member 31 is implemented as a plurality of shims, which fill the gap between the adjusting groove 11 and the adjusting protrusion 211, thereby fixing the relative position of the synchronizing rack 21 and the drive rod 10 and helping to improve the reliability of force transmission between the synchronizing rack 21 and the drive rod 10.

[0044] In one specific embodiment, such as Figure 6 As shown, the synchronous rack 21 has several axially spaced adjusting protrusions 211 on the side facing the drive rod 10, and the drive rod 10 has several axially spaced adjusting grooves 11 on the side facing the synchronous rack 21. It should be understood that by cooperating with multiple sets of adjusting protrusions 211 and adjusting grooves 11, the force-bearing area between the synchronous rack 21 and the drive rod 10 can be increased, thereby improving the structural reliability of the block-pulling device 1.

[0045] In at least one embodiment, such as Figure 7 As shown, the power source 90 is implemented as a hydraulic cylinder, and the drive rod 10 is connected to the piston rod of the hydraulic cylinder via a piston coupling 91, wherein the connection between the drive rod 10 and the piston coupling 91 is stacked along a third direction. Further, the radial adjustment member 32 is implemented as a screw, which is screwed onto one of the drive rod 10 and the piston coupling 91, with the end of the screw abutting against the other of the drive rod 10 and the piston coupling 91 along a third direction. By adjusting the extension length of the screw, i.e., adjusting the length of the portion of the screw located between the drive rod 10 and the piston coupling 91, the relative position of the drive rod 10 and the piston coupling 91 in the third direction can be adjusted, thereby adjusting the relative position of the synchronous rack 21 and the synchronous gear 22 in the third direction.

[0046] In some embodiments, such as Figure 3 and Figure 5As shown, the synchronous transmission assembly 20 also includes a pressure rod 24 mounted on the frame of the core box 2. The pressure rod 24 rotatably presses against the drive rod 10, providing a force to drive the synchronous rack 21 toward the synchronous gear 22. This helps prevent radial runout between the drive rod 10 and the synchronous rack 21 relative to the synchronous gear 22, improving the meshing reliability of the synchronous rack 21 and the synchronous gear 22. It is worth noting that during the movement of the drive rod 10 in the second direction, the pressure rod 24 can rotate relative to the drive rod 10 to reduce the friction between the drive rod 10 and the pressure rod 24, thereby reducing the risk of the drive rod 10 jamming.

[0047] Furthermore, such as Figure 2 and Figure 4 As shown, the gap adjustment assembly 30 also includes a clamping adjustment member 33. At least a portion of the clamping adjustment member 33 is clamped between the pressure rod 24 and the frame of the core box 2 in the third direction, so as to adjust the relative position of the pressure rod 24 and the frame of the core box 2 in the third direction, thereby adapting the pressure rod 24 and the drive rod 10; and can adjust the clamping force of the pressure rod 24 on the drive rod 10, thereby adjusting the meshing state of the synchronous rack 21 and the synchronous gear 22.

[0048] It is worth mentioning that those skilled in the art can select the type, quantity, and installation method of the axial adjusting member 31, radial adjusting member 32, and clamping adjusting member 33 according to actual design requirements, and such adjustments all fall within the protection scope of this application. For example, the axial adjusting member 31, radial adjusting member 32, and clamping adjusting member 33 can be implemented as one or more of the following types: gasket, eccentric sleeve, screw, disc spring, etc.

[0049] In some embodiments, such as Figures 8-11 As shown, the floating connection assembly 40 includes a floating coupling 41 for connecting the drive rod 10 and the movable block 61. One end of the drive rod 10 near the floating coupling 41 is provided with a transition portion 12 and a receiving groove 411, and the other end of the floating coupling 41 near the drive rod 10 is provided with a transition portion 12 and a receiving groove 411. The receiving groove 411 and the transition portion 12 are clearance-fitted so that the floating coupling 41 is connected to the drive rod 10 and allows the floating coupling 41 to be displaced relative to the drive rod 10 in a first direction, a second direction, and a third direction.

[0050] It is understandable that the dimensions of the elongated movable block 61 in the length, width and height directions will change after it is heated and expanded, especially the change in the length direction. If each drive rod 10 is directly fixed to the movable block 61, especially if the two drive rods 10 are directly fixed to the two ends of the movable block 61, the drive rods 10 may be deformed or even jammed after the movable block 61 is heated and expanded.

[0051] In this embodiment, such as Figures 8-11 As shown, each drive rod 10 is connected to the movable block 61 via a floating coupling 41. When the drive rod 10 drives the movable block 61 to move along the second direction, the groove wall of the receiving groove 411 and the wall of the transition part 12 abut against each other to achieve the transmission of driving force. Furthermore, the synchronous transmission assembly 20 described above enhances the synchronicity between the drive rods 10. When the movable block 61 expands due to heat, the floating coupling 41 can displace relative to the drive rod 10 in the first, second, and third directions. In other words, the movable block 61 can displace relative to the drive rod 10 in the first, second, and third directions, thereby compensating for the expansion of the movable block 61. This helps to prevent the stress caused by the expansion deformation of the movable block 61 from being transmitted to the drive rod 10, thereby reducing the risk of deformation of the drive rod 10 and improving the reliability and stability of the block-pulling device 1.

[0052] It is worth mentioning that those skilled in the art can, according to actual design requirements, respectively set the adapter 12 and the receiving groove 411 on the movable block 61 and the floating coupling 41, which also helps to avoid jamming between the drive rod 10 and the movable block 61; those skilled in the art can also adjust the matching relationship between the adapter 12 and the receiving groove 411 according to actual design requirements. For example, the floating coupling 41 can be allowed to move relative to the drive rod 10 only in one or two of the first direction, the second direction and the third direction. Such adjustments all fall within the protection scope of this application.

[0053] In some embodiments, such as Figure 9 and Figure 10 As shown, the receiving groove 411 is a "T"-shaped groove, and the width of the opening of the receiving groove 411 is smaller than the width of the bottom of the groove; the adapter 12 has a "T"-shaped structure, which allows it to be clearance-fitted with the receiving groove 411; the floating connection assembly 40 also includes a pin 42, which is used to connect the drive rod 10 and the floating coupling 41. The adapter 12 has a through hole 121, and the pin 42 passes through the through hole 121. The diameter of the through hole 121 is larger than the diameter of the pin 42, so as to allow the adapter 12 to move radially relative to the pin 42; the length of the pin 42 is greater than the width of the adapter 12 along the axial direction of the pin 42, so as to allow the adapter 12 to move axially relative to the pin 42.

[0054] It should be understood that by using the "T"-shaped receiving groove 411 and the "T"-shaped adapter 12 to cooperate, and by connecting the drive rod 10 and the floating coupling 41 through the pin 42, it is easy to quickly assemble the drive rod 10 and the floating coupling 41, and it can also improve the connection reliability of the drive rod 10 and the floating coupling 41 and reduce the risk of the drive rod 10 and the floating coupling 41 accidentally disengaging.

[0055] In at least one embodiment, the length direction of the pin 42 is parallel to the first direction, which helps to make the movable amount of the floating coupling 41 along the first direction greater than the movable amount along the second and third directions, which is more in line with the characteristic that the movable block 61 has a large dimensional change along the length direction after thermal expansion.

[0056] In some embodiments, such as Figure 11 As shown, the floating connection assembly 40 also includes a floating fastener 43 and a floating adjuster 44. The floating fastener 43 is used to connect the floating coupling 41 and the movable block 61. By adjusting the floating fastener 43, the floating coupling 41 can be made parallel to the opposite surface of the drive rod 10. The floating adjuster 44 is clamped between the floating coupling 41 and the movable block 61 along the second direction, so that the floating coupling 41, the drive rod 10 and the movable block 61 can be kept in contact.

[0057] It is understandable that after the elongated movable block 61 is deformed by heat, its two ends along its length bend away from the drive rod 10, and the amount of deformation is relatively large. This will cause the movable block 61 to bend and the amount of deformation at both ends of the movable block 61 to be inconsistent. If each floating coupling 41 is directly fixed to the movable block 61, especially if two floating couplings 41 are directly fixed to both ends of the movable block 61, although the drive rod 10 can be displaced relative to the movable block 61 in the first, second, and third directions to compensate for thermal expansion through the cooperation of the receiving groove 411 and the adapter 12, the relative surfaces of the floating couplings 41 and the drive rod 10 may not be parallel due to thermal deformation, or the contact state between each drive rod 10 and its respective floating coupling 41 may be inconsistent.

[0058] The forced synchronization method using the synchronous transmission assembly 20 described above requires that each drive rod 10 is in normal contact with its respective floating coupling to achieve a tighter seal. For example, if one drive rod 10 is in normal contact with the floating coupling 41 (i.e., surface-to-surface contact), but the other drive rod 10 is not in contact with or interferes with the floating coupling 41, then the two drive rods 10 will have difficulty applying a consistent driving force to the moving block 61, i.e., they will have difficulty pushing the moving block 61 synchronously.

[0059] In this embodiment, by adjusting the floating fastener 43, machining and assembly errors of the floating coupling 41, the movable block 61, and the drive rod 10 can be compensated for. This helps ensure that the opposing surfaces of the floating coupling 41 and the drive rod 10 are parallel in the initial state, thereby ensuring that each drive rod 10 is in normal contact with its respective floating coupling 41. Furthermore, the floating adjustment member 44, sandwiched between the floating coupling 41 and the movable block 61, keeps the floating coupling 41, the drive rod 10, and the movable block 61 in contact; in other words, it helps to keep the driving force applied by each drive rod 10 to the movable block 61 consistent. In addition, when the movable block 61 undergoes irreversible deformation during long-term use, the contact state of the floating coupling 41, the drive rod 10, and the movable block 61 can be adjusted by readjusting the floating fastener 43 and the floating adjustment member 44, thereby extending the service life of the block-pulling device 1 and the core box 2 as a whole.

[0060] It is worth mentioning that, according to actual design requirements, those skilled in the art can respectively set the adapter 12 and the receiving groove 411 on the movable block 61 and the floating coupling 41, and set the floating fastener 43 and the floating adjustment part 44 on the floating coupling 41 and the drive rod 10. This also helps to avoid jamming between the drive rod 10 and the movable block 61; such adjustments all fall within the protection scope of this application.

[0061] In some embodiments, such as Figure 11 As shown, the floating fastener 43 includes several adjusting screws 431, which are adapted to pass through holes in the movable block 61 and be threadedly connected to the floating coupling 41. By adjusting the engagement length of each adjusting screw 431 with the floating coupling 41, the relative position of the floating coupling 41 and the movable block 61 in the second direction can be adjusted, and the floating coupling 41 can be made parallel to the opposing surface of the drive rod 10. The floating adjustment member 44 is adapted to elastically deform in the second direction, and the floating adjustment member 44 is compressed and clamped between the floating coupling 41 and the movable block 61.

[0062] Within the compression adjustment range of the floating adjustment member 44, the total elastic force of the floating adjustment member 44 is greater than or equal to the driving force of the power source 90, so that the floating coupling 41, the drive rod 10, and the movable block 61 remain in contact, and the force on each drive rod 10 is ensured to be consistent. Preferably, the total elastic force of the floating adjustment member 44 is greater than the driving force of the power source 90, which helps to avoid elastic deformation of the floating adjustment member 44 caused by the driving force, and thus ensures that the force on each drive rod 10 is consistent to a large extent.

[0063] In at least one embodiment, the floating fastener 43 includes four rectangularly arranged adjusting screws 431, and the floating adjustment member 44 is implemented as four sets of disc springs 441, each set of disc springs 441 being sleeved on the corresponding adjusting screw 431. It should be understood that this arrangement allows for simple, quick, and effective adjustment of the relative position of the floating coupling 41 and the movable block 61 in the second direction using a smaller number of adjusting screws 431, and ensures proper contact between the drive rod 10 and the floating coupling 41; furthermore, the elastic deformation of the disc springs 441 can accommodate minor adjustments of the adjusting screws 431, thereby contributing to improved adjustment accuracy.

[0064] It is worth mentioning that those skilled in the art can select the type, quantity, and installation method of the floating fasteners 43 and the floating adjusting members 44 according to actual design requirements, and such adjustments all fall within the protection scope of this application. For example, the floating adjusting member 44 can also be implemented as a compression spring or a washer.

[0065] In some embodiments, such as Figure 5 and Figure 9 As shown, the block-pulling device 1 for the core box further includes a heat insulation component 50, which includes at least one of a heat insulation plate 51 and a heat dissipation base 52. The heat insulation plate 51 is disposed between the drive rod 10 and the movable block 61 to isolate heat conduction between them, thereby reducing the transfer of heat from the movable block 61 to the synchronous transmission assembly 20 and the power source 90 via the drive rod 10. The heat dissipation base 52 is used to mount the power source 90 and has at least one of heat dissipation fins, a cooling air duct, and a cooling flow channel to dissipate heat from the power source 90, thereby reducing the risk of power source 90 failure.

[0066] In at least one embodiment, the power source 90 is a hydraulic cylinder. The seals of the hydraulic cylinder are prone to failure in long-term high-temperature working environments, resulting in oil leakage and pressure loss. In this embodiment, the heat insulation plate 51 includes a first heat insulation plate 511 and a second heat insulation plate 512. Wherein, as... Figure 9 As shown, the first heat insulation plate 511 is fixed to the drive rod 10 or the floating coupling 41 and is located between the contact surfaces of the drive rod 10 and the floating coupling 41, thereby reducing the heat transfer from the moving block 61 to the drive rod 10 via the floating coupling 41. Figure 13 As shown, the second heat insulation plate 512 is fixed to the frame and located between the mold 60 of the core box 2 and the block-pulling device 1, for example, between the movable block 61 and the block-pulling device 1, thereby reducing the radiation of heat from the movable block 61 to the drive rod 10 and the floating coupling 41. It should be understood that the first heat insulation plate 511 and the second heat insulation plate 512 help to prevent the heat of the movable block 61 from being transferred to the piston rod of the hydraulic cylinder via the drive rod 10, which could lead to hydraulic cylinder failure.

[0067] Furthermore, such as Figure 5 As shown, the heat dissipation base 52 includes a fixing part 521 and a heat dissipation part 522 with cooling channels. The fixing part 521 is used to fix it to the frame, and the heat dissipation part 522 is used to install the hydraulic cylinder. The heat dissipation part 522 is located between the cylinder body of the hydraulic cylinder and the drive rod 10, thereby reducing the heat radiation from the drive rod 10 to the hydraulic cylinder. Furthermore, the coolant in the heat dissipation part 522 can dissipate heat from the hydraulic cylinder, further reducing the risk of hydraulic cylinder failure.

[0068] It is worth mentioning that those skilled in the art can adjust the specific structure, material and installation method of the heat insulation plate 51 and the heat dissipation base 52 according to actual design requirements, and such adjustments all fall within the protection scope of this application.

[0069] A type of core box 2, such as Figure 12 As shown, the system includes at least one set of molds 60 and the aforementioned block-pulling device 1. Specifically, the mold 60 defines at least one cavity and includes at least one movable block 61. The block-pulling device 1 is connected between the power source 90 and the movable block 61, and is used to drive the movable block 61 to perform mold opening and closing actions. It should be understood that the block-pulling device 1 helps to prevent the movable block from tilting during the mold opening and closing process, and also improves the tightness of the mold closing, thereby improving production stability and yield.

[0070] In some embodiments, the core box 2 includes a locking assembly 70, which includes at least one of a first locking structure, a second locking structure 71, and a third locking structure 72. Specifically, the first locking structure is used to maintain the driving force of the power source 90 after the membrane is closed, thereby holding the movable block 61 in the membrane-closed position. For example, when the power source 90 is implemented as a hydraulic cylinder, the movable block 61 is held in the membrane-closed position by holding pressure in the hydraulic cylinder.

[0071] like Figure 1 As shown, the second locking structure 71 is fixed to the front mold (not shown) or the rear mold (not shown) of the mold 60. When the mold 60 is closed, the second locking structure 71 can wedge the movable block 61 through the wedge surface, which helps to prevent the movable block 61 from being displaced relative to the front mold or the rear mold, so as to help keep the movable block 61 in the mold closing position.

[0072] like Figure 1As shown, the third locking structure 72 is movably mounted on the frame. When the third locking structure is driven to move toward the movable block 61, it can wedge the movable block 61 through the wedge surface. It should be understood that if the rear mold of the core box 2 is fixed and the second locking structure 71 is fixed to the front mold, then when the film is closed, the wedge force of the second locking structure 71 can only be applied to the side of the movable block 61 closest to the front mold. By adjusting the position of the third locking structure 72, the wedge force of the third locking structure 72 can be applied to the side of the movable block 61 away from the front mold. This helps to balance the force on the movable block 61 and further improve the tightness of the film closure.

[0073] It is worth mentioning that those skilled in the art can adjust the specific dimensions, quantity, and installation method of the first locking structure, the second locking structure 71, and the third locking structure 72 according to actual design requirements, and such adjustments all fall within the protection scope of this application. For example, when the mold 60 includes several movable blocks 61, the second locking structure 71 can also be installed on one of the movable blocks 61 and wedge the other movable block 61 tightly through the wedge surface when the mold is closed.

[0074] In some embodiments, the core box 2 further includes several limit switches, which are used to sequentially detect whether the moving parts such as the front mold, rear mold, and each movable block 61 have moved to the mold closing position according to the mold closing sequence. Furthermore, the limit switches are used to send control signals to execute the next action after each moving part has reached its position, and to prohibit the execution of the next action if any moving part has not reached its position, which helps to avoid collisions between the moving parts.

[0075] Those skilled in the art can select the type of limit switch and adjust the installation position and installation method of the limit switch according to actual design requirements; in addition, the block pulling device 1 can be used not only to drive the movable block 61 to perform mold opening and closing actions, but also to drive other moving parts in the core box 2 to move. Such adjustments all fall within the protection scope of this application.

[0076] In some embodiments, the core box 2 further includes several heating components. The front mold, rear mold, and each movable block 61 of the mold 60 are respectively provided with independent heating components. Each heating component includes at least one heating element and at least one temperature sensing element. Specifically, the heating element can heat the corresponding module, and the temperature sensing element can monitor the temperature of the module in real time, thereby forming multiple independent temperature control loops. This helps to keep the temperature difference between the modules within a reasonable range, thereby improving the consistency of thermal expansion of the modules and reducing the risk of overall deformation of the mold 60.

[0077] In at least one embodiment, such as Figure 12As shown, the heating assembly also includes a heavy-duty connector 80, which is used for power input to the heating element and input / output of control signals to the temperature sensing element. It is worth noting that those skilled in the art can select the types of heating elements and temperature sensing elements, and adjust their arrangement according to actual design requirements; such adjustments fall within the scope of protection of this application.

[0078] The basic principles, main features, and advantages of this invention have been described above. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection claimed by this invention is defined by the appended claims and their equivalents.

Claims

1. A block-pulling device for a core box, characterized in that, include: At least two drive rods, each drive rod being connected at intervals to a movable block of the core box along a first direction, the drive rods being used to connect to a power source to drive the movable block to move along a second direction; A synchronous transmission assembly is connected to each of the drive rods to enable each drive rod to move synchronously along the second direction; A floating connection assembly, which is mounted between the drive rod and the movable block, is configured to allow the movable block to be displaced relative to the drive rod in the first direction, the second direction, and the third direction. The first direction is parallel to the length direction of the active block, and the first, second, and third directions are perpendicular to each other.

2. The block-pulling device for a core box according to claim 1, characterized in that, The synchronous transmission assembly includes at least two synchronous racks, at least two synchronous gears, and a synchronous shaft. Each synchronous rack is fixed to a corresponding drive rod, and each synchronous gear is spaced apart on the synchronous shaft along a first direction. The synchronous gears are used to mesh with the synchronous racks so that each drive rod moves synchronously along a second direction.

3. The block-pulling device for a core box according to claim 2, characterized in that, The block-pulling device for the core box further includes a gap adjustment assembly, which includes at least one of an axial adjustment element and a radial adjustment element; At least a portion of the axial adjusting member is clamped between the synchronous rack and the drive rod along the second direction, and / or between the drive rod and the power source along the second direction, so as to adjust the relative position of the synchronous rack and the synchronous gear in the second direction; At least a portion of the radial adjustment member is clamped between the synchronizing rack and the drive rod along a third direction, and / or between the drive rod and the power source along a third direction, so as to adjust the relative position of the synchronizing rack and the synchronizing gear in a third direction.

4. The block-pulling device for a core box according to claim 1, characterized in that, The floating connection assembly includes a floating coupling for connecting the drive rod and the movable block; The drive rod has one of a transition portion and a receiving groove at one end near the floating coupling, and the floating coupling has the other of a transition portion and a receiving groove at one side near the drive rod. The receiving groove and the transition portion are clearance-fitted so that the floating coupling is connected to the drive rod and allows the floating coupling to be displaced relative to the drive rod in the first direction, the second direction and the third direction.

5. The block-pulling device for a core box according to claim 4, characterized in that, The receiving groove is a "T" shaped groove, and the width of the opening of the receiving groove is smaller than the width of the bottom of the groove; the transition part is a "T" shaped structure, which can be fitted with the receiving groove with a clearance. The floating connection assembly further includes a pin for connecting the drive rod and the floating coupling. The adapter has a through hole through which the pin passes. The diameter of the through hole is larger than the diameter of the pin to allow the adapter to move radially relative to the pin. The length of the pin is greater than the width of the adapter along the axial direction of the pin to allow the adapter to move axially relative to the pin.

6. The core box pulling device according to any one of claims 1-5, characterized in that, The floating connection assembly includes a floating coupling, a floating fastener, and a floating adjuster. The floating coupling is used to connect the drive rod and the movable block. The floating fastener is used to connect the floating coupling and the movable block. By adjusting the floating fastener, the opposing surfaces of the floating coupling and the drive rod are made parallel. The floating adjuster is clamped between the floating coupling and the movable block along a second direction, so that the floating coupling, the drive rod, and the movable block remain in contact.

7. The block-pulling device for a core box according to claim 6, characterized in that, The floating fastener includes a plurality of adjusting screws, which are adapted to pass through the light holes on the movable block and be threadedly connected to the floating coupling. By adjusting the engagement length of each adjusting screw with the floating coupling, the relative position of the floating coupling and the movable block in the second direction can be adjusted, and the opposing surfaces of the floating coupling and the drive rod can be made parallel. The floating adjustment member is adapted to elastically deform in a second direction. The floating adjustment member is compressed and clamped between the floating coupling and the movable block. Within the compression adjustment range of the floating adjustment member, the total elastic force of the floating adjustment member is greater than or equal to the driving force of the power source, so as to keep the floating coupling, the drive rod and the movable block in contact.

8. The core box pulling device according to any one of claims 1-5, characterized in that, The block-pulling device for the core box further includes a heat insulation component, which includes at least one of a heat insulation plate and a heat dissipation base; The heat insulation plate is disposed between the drive rod and the movable block to isolate heat conduction between the drive rod and the movable block; The heat dissipation base is used to install a power source, and the heat dissipation base has at least one of heat dissipation fins, cooling air ducts and cooling flow channels to dissipate heat from the power source.

9. A core box, characterized in that, include: At least one set of molds, the molds defining at least one cavity, the molds including at least one movable block; The block-pulling device for a core box as described in any one of claims 1-8, wherein the block-pulling device is connected between a power source and the movable block, for driving the movable block to perform mold opening and closing actions.

10. The core box according to claim 9, characterized in that, The core box includes a locking component, which includes at least one of a first locking structure, a second locking structure, and a third locking structure; The first locking structure is used to maintain the driving force of the power source after the membrane is closed; The second locking structure is fixed to the front or rear mold of the mold. When the mold is closed, the second locking structure can wedge the movable block through the wedge-shaped surface. The third locking structure is movably mounted on the frame, and when the third locking structure is driven to move toward the movable block, it can wedge the movable block tightly through the wedge surface.

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