CN111300758B - Screw thread core-pulling mechanism and injection mold - Google Patents

Screw thread core-pulling mechanism and injection mold Download PDF

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Publication number
CN111300758B
CN111300758B CN202010202800.7A CN202010202800A CN111300758B CN 111300758 B CN111300758 B CN 111300758B CN 202010202800 A CN202010202800 A CN 202010202800A CN 111300758 B CN111300758 B CN 111300758B
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China
Prior art keywords
core
rod
thread
seat
core rod
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CN111300758A (en
Inventor
胡上华
张文彪
张�荣
胡本涛
陈翔养
陈天
匡仁煌
陈珺
朱帝宏
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Guangdong Bozhilin Robot Co Ltd
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Guangdong Bozhilin Robot Co Ltd
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Priority to CN202010202800.7A priority Critical patent/CN111300758B/en
Publication of CN111300758A publication Critical patent/CN111300758A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/2618Moulds having screw-threaded mould walls
    • B29C45/262Moulds having screw-threaded mould walls provided with unscrewing drive means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/44Removing or ejecting moulded articles for undercut articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2001/00Articles provided with screw threads

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention relates to a thread core-pulling mechanism and an injection mold. The screw core-pulling mechanism includes: a slider seat; one end of the rack is connected with the front template in a sliding way, and the other end of the rack penetrates through the sliding block seat; the gear transmission assembly is arranged on the sliding block seat; the core rod assembly comprises a thread sleeve and a threaded core rod, the thread sleeve is fixed on the sliding block seat, the threaded core rod is rotatably arranged on the sliding block seat, one end of the threaded core rod is provided with a first external thread, the other end of the threaded core rod is provided with a second external thread, the threaded core rod is also provided with a transmission tooth, and the transmission tooth is in transmission connection with the rack through a gear transmission assembly; one end of the side hole core pulling rod is connected with the sliding block seat, and the other end of the side hole core pulling rod is used for forming a side hole of a product; and the driving component is used for driving the sliding block seat to reciprocate along the core-pulling direction. The thread core-pulling mechanism is simple in overall structure, small in occupied space, capable of effectively optimizing the space of an injection mold and saving production cost.

Description

Screw thread core-pulling mechanism and injection mold
Technical Field
The invention relates to the technical field of molds, in particular to a thread core-pulling mechanism and an injection mold.
Background
When a plastic product is developed and manufactured, a motor thread-releasing mechanism is often required to be arranged in the direction of a side hole with an inner thread, and a sliding block core-pulling mechanism is arranged in the direction of the side hole without the inner thread to respectively realize the thread-releasing action and the core-pulling action.
Disclosure of Invention
Therefore, the thread core-pulling mechanism and the injection mold are needed to solve the problems, the thread core-pulling mechanism is simple in overall structure and small in occupied space, the space of the injection mold can be effectively optimized, and the production cost is saved.
A screw thread mechanism of loosing core for injection mold, injection mold includes preceding template and back template, the screw thread mechanism of loosing core includes:
the sliding block seat is arranged in a cavity formed by enclosing the front template and the rear template;
one end of the rack is connected with the front template in a sliding mode, and the other end of the rack penetrates through the sliding block seat;
the gear transmission assembly is mounted on the sliding block seat;
the core rod assembly comprises a thread sleeve and a thread core rod, the thread sleeve is fixed on the sliding block seat, the thread core rod is rotatably arranged on the sliding block seat, one end of the thread core rod is provided with a first external thread in threaded fit with the thread sleeve, the other end of the thread core rod is provided with a second external thread used for an internal thread of a side hole of a molded product, the thread core rod is also provided with a transmission tooth, and the transmission tooth is in transmission connection with the rack through the gear transmission assembly;
one end of the side hole core pulling rod is connected with the sliding block seat, and the other end of the side hole core pulling rod is used for forming a side hole of the product; and
and the driving assembly is used for driving the sliding block seat to reciprocate along the core-pulling direction.
After injection molding is finished, an injection mold is opened at a parting surface PL position between a front mold plate and a rear mold plate, the front mold plate can drive a rack to move along a mold opening direction, a threaded core rod is driven to rotate through a gear transmission assembly in the rack moving process, and under the matching of a first external thread and a threaded sleeve, the threaded core rod can retreat towards one side far away from a product until a second external thread of the threaded core rod is separated from an internal thread of a side hole of the product, so that synchronous thread stripping action can be realized in the mold opening process; when the mold stops opening, the driving assembly drives the sliding block seat to move along the core pulling direction, the rack and the gear transmission assembly are in a meshed state and can synchronously move in the same direction as the sliding block seat, the threaded core rod and the side hole core pulling rod can be driven to move along the core pulling direction in the moving process of the sliding block seat and be separated from the side hole of the product, core pulling action is completed, and then the ejection mechanism of the injection mold can smoothly eject the product. The thread core-pulling mechanism can complete automatic thread-releasing action while opening the mold without using other auxiliary equipment (such as a traditional motor thread-releasing mechanism), so that the whole structure is simplified, the occupied space is smaller, the space of an injection mold can be effectively optimized, the tonnage and the energy consumption of the injection molding machine are reduced, and the production cost is saved.
In one embodiment, the gear transmission assembly includes a first transmission gear, a second transmission gear, and a transmission rod coaxially connecting the first transmission gear and the second transmission gear, the transmission rod is rotatably mounted to the slider seat, the first transmission gear is engaged with the rack, and the second transmission gear is engaged with the transmission teeth.
In one embodiment, the slider seat is provided with an inner cavity with one open side, a side cover is fixed on the open side of the slider seat, an installation cavity for installing the gear transmission assembly, the core rod assembly and the side hole core-pulling rod is defined between the side cover and the slider seat, and the same end of the threaded core rod and the same end of the side hole core-pulling rod respectively penetrate out of one surface of the slider seat far away from the side cover.
In one embodiment, the thread core rod is provided with a central cavity with two through ends, the core rod assembly further comprises an inner core rod, a fixing block and a fixing sleeve, the inner core rod penetrates through the central cavity, the fixing block is fixed at one end, close to the first external thread, of the inner core rod, the fixing block is arranged in the fixing sleeve and can move along the axial direction of the inner core rod relative to the fixing sleeve, the fixing sleeve is fixed on the side cover, a core head used for forming the inner hole of the side hole of the product is arranged at one end, close to the second external thread, of the inner core rod, and two end faces of the thread core rod are respectively abutted to the fixing block and the core head in a limiting mode.
In one embodiment, a connecting block is arranged at one end of the rack, guide wheels are respectively arranged on two opposite sides of the connecting block, and the guide wheels are in sliding fit with the front mold plate and can enable the connecting block to slide in a reciprocating manner along the core-pulling direction.
In one embodiment, the threaded core pulling mechanism further comprises a guide strip, the guide strip is fixedly connected with the rear template, a boss is arranged on the side of the slider seat, and the guide strip is matched with the boss to guide the movement of the slider seat along the core pulling direction.
In one embodiment, a wedging block is arranged on one side, close to the front template, of the slider seat, a groove matched with the wedging block is formed in the front template, and the wedging block is embedded in the groove in a matched mode of the injection mold.
In one embodiment, the threaded core-pulling mechanism further comprises a die opening stroke control rod, one end of the die opening stroke control rod is connected with the front die plate, the other end of the die opening stroke control rod penetrates through the rear die plate, a limiting groove is formed in the rear die plate, and a limiting flange matched with the limiting groove is arranged at the end of the die opening stroke control rod.
In one embodiment, the driving assembly comprises a driving part, a fixed seat, a connecting rod and a mounting block, the driving part is mounted on the fixed seat, one end of the connecting rod is fixedly connected with the driving end of the driving part, and the other end of the connecting rod is fixedly connected with the sliding block seat through the mounting block.
An injection mould comprising a threaded core-pulling mechanism as claimed in any one of the preceding claims.
Drawings
FIG. 1 is a schematic structural diagram of a threaded core-pulling mechanism according to an embodiment of the present invention;
FIG. 2 is an exploded view of the threaded core-pulling mechanism of FIG. 1;
FIG. 3 is an exploded view of a core pin assembly of the threaded core pulling mechanism;
FIG. 4 is a first cross-sectional view of an injection mold according to an embodiment of the invention;
FIG. 5 is a schematic view of a portion of the injection mold of FIG. 4;
fig. 6 is a second cross-sectional view of an injection mold according to an embodiment of the invention.
10. A slider holder, 11, a side cover, 12, a wedge block, 13, a guide bar, 20, a rack bar, 21, a connecting block, 22, a guide wheel, 23, a first pin, 24, a second pin, 25, a track line, 30, a gear transmission assembly, 31, a first transmission gear, 32, a second transmission gear, 33, a transmission rod, 34, a third bearing, 35, a fourth bearing, 40, a core rod assembly, 41, a thread bushing, 42, a thread core rod, 421, a first external thread, 422, a second external thread, 423, a transmission tooth, 43, a first bearing, 44, a second bearing, 45, an internal core rod, 451, a core head, 46, a fixing block, 47, a fixing sleeve, 48, a key bar, 50, a side hole, 60, a driving assembly, 61, a driving member, 62, a fixing base, 63, a connecting rod, 64, a mounting block, 70, a front template, 80, a rear template, 90, a mold opening stroke control rod, 100, a guide bar, 20, a rack bar, 21, a third bearing, a fourth bearing, a core rod assembly, a core bar, a screw bushing, a bushing, an article of manufacture.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. The terms "first," "second," "third," and "fourth" used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.
A thread core-pulling mechanism is used for an injection mold, please refer to FIG. 6, the injection mold comprises a front mold plate 70 and a rear mold plate 80, please refer to FIGS. 1 and 2, the thread core-pulling mechanism comprises a slider seat 10, a rack 20, a gear transmission assembly 30, a core rod assembly 40, a side hole core-pulling rod 50 and a driving assembly 60.
As shown in fig. 6, the slider holder 10 is disposed in a cavity defined by the front mold plate 70 and the rear mold plate 80. One end of the rack 20 is slidably connected to the front mold plate 70 and can slide relative to the front mold plate 70 in the core-pulling direction, and the other end of the rack penetrates through the slider seat 10, and during mold opening, the front mold plate 70 can drive the rack 20 to move along the mold opening direction. The gear assembly 30 is mounted to the slider holder 10. Referring to fig. 3 and 5, the core rod assembly 40 includes a thread insert 41 and a threaded core rod 42, the thread insert 41 is fixed to the slider seat 10, the threaded core rod 42 is rotatably mounted to the slider seat 10, and optionally, the threaded core rod 42 is mounted to the slider seat 10 through a first bearing 43 and a second bearing 44, so that the rotation stability is better. One end of the screw-type core rod 42 is provided with a first external thread 421 in threaded fit with the screw thread sleeve 41, the other end is provided with a second external thread 422 of the side hole internal thread for the molded product 100, the screw-type core rod 42 is further provided with a driving tooth 423, and the driving tooth 423 is in transmission connection with the rack 20 through the gear transmission assembly 30. The gear transmission assembly 30 is used for converting the movement of the rack 20 in the mold opening direction into the rotation movement of the threaded core rod 42, and further the movement of the threaded core rod 42 in the axial direction can be realized through the matching of the threaded core rod 42 and the thread sleeve 41. One end of the side hole plunger rod 50 is connected to the slider holder 10 and the other end is used for a side hole of the molded article 100. The driving assembly 60 is used for driving the slider holder 10 to reciprocate along the core-pulling direction, and the rack 20 and the slider holder 10 move synchronously during the core-pulling process.
After the injection molding is finished, as shown in fig. 5 and 6, the injection mold is opened at a parting plane PL position between the front mold plate 70 and the rear mold plate 80, the front mold plate 70 can drive the rack 20 to move along the mold opening direction, the rack 20 drives the threaded core rod 42 to rotate through the gear transmission assembly 30 in the moving process, and under the matching of the first external thread 421 and the thread sleeve 41, the threaded core rod 42 can retreat towards one side far away from the product 100 until the second external thread 422 of the threaded core rod 42 is separated from the inner thread of the side hole of the product 100, so that the synchronous thread removing action in the mold opening process can be realized; when the mold is stopped to be opened, the driving assembly 60 drives the slider seat 10 to move along the core-pulling direction, the rack 20 is connected with the front mold plate 70 in a sliding manner and can slide relative to the front mold plate 70 in the core-pulling direction, and the rack 20 and the gear transmission assembly 30 are in a meshed state, so that the rack 20 and the slider seat 10 can synchronously move in the same direction, the slider seat 10 can drive the threaded core rod 42 and the side hole core rod 50 to move along the core-pulling direction and separate from the side holes of the product 100 in the moving process, the core-pulling action is completed, and then the ejection mechanism of the injection mold can smoothly eject the product 100. The thread core-pulling mechanism can complete automatic thread-releasing action while opening the mold without using other auxiliary equipment (such as a traditional motor thread-releasing mechanism), so that the whole structure is simplified, the occupied space is smaller, the space of an injection mold can be effectively optimized, the tonnage and the energy consumption of the injection molding machine are reduced, and the production cost is saved.
In addition, after the product 100 is demolded, the driving assembly 60 can drive the slider holder 10 to move reversely to reset, during the movement and resetting of the slider holder 10, the rack 20 moves in the same direction and can slide and reset relative to the front mold plate 70, then, mold closing is performed, the rack 20 can move in the mold closing direction under the driving of the front mold plate 70, and then, the reverse movement and resetting of the threaded core rod 42 are realized through the matching of the rack 20 and the gear transmission assembly 30. Therefore, the thread core-pulling mechanism can be automatically reset to the initial state, so that the injection molding production of the product 100 is repeatedly carried out, and the production efficiency is improved.
Referring to fig. 2 and 4, in one embodiment, the gear transmission assembly 30 includes a first transmission gear 31, a second transmission gear 32, and a transmission rod 33 coaxially connecting the first transmission gear 31 and the second transmission gear 32, wherein the transmission rod 33 is rotatably mounted on the slider holder 10, the first transmission gear 31 is engaged with the rack 20, and the second transmission gear 32 is engaged with the transmission tooth 423. Specifically, the transmission rod 33 may be mounted on the slider seat 10 through a third bearing 34 and a fourth bearing 35, the transmission rod 33 and the threaded core rod 42 are substantially parallel to each other, during the mold opening process, the front mold plate 70 is separated from the rear mold plate 80, the front mold plate 70 may drive the rack 20 to perform a linear motion along the mold opening direction, the rack 20 and the first transmission gear 31 are in a meshed state, and may drive the first transmission gear 31 to rotate, the first transmission gear 31 further drives the second transmission gear 32 to rotate through the transmission rod 33, and the second transmission gear 32 and the transmission teeth 423 on the threaded core rod 42 are in a meshed state, and may drive the threaded core rod 42 to rotate. The gear transmission assembly 30 has a compact overall structure and reliable transmission. Of course, in other embodiments, the gear assembly 30 may be formed by combining gears of other types (e.g., bevel gears), as long as the linear motion of the rack 20 is converted into the rotation of the threaded core rod 42.
Referring to fig. 1 and 2, in an embodiment, the slider seat 10 has an inner cavity with an open side, the side cover 11 is fixed to the open side of the slider seat 10, a mounting cavity for mounting the gear transmission assembly 30, the core pin assembly 40 and the side hole plunger rod 50 is defined between the side cover 11 and the slider seat 10, and the same ends of the threaded core rod 42 and the side hole plunger rod 50 respectively penetrate through a surface of the slider seat 10 away from the side cover 11. Thus, the internal space of the slider holder 10 can be fully utilized, the overall structure is more compact, and the precise gear transmission assembly 30 can be protected. Alternatively, the side cover 11 and the slider seat 10 may be detachably connected by fasteners (e.g., screws, pins, etc.).
Further, please refer to fig. 3 and 4, the threaded core rod 42 has a central cavity with two through ends, the core rod assembly 40 further includes an inner core rod 45, a fixing block 46 and a fixing sleeve 47, the inner core rod 45 is inserted into the central cavity, the fixing block 46 is fixed at one end of the inner core rod 45 near the first external thread 421, the fixing block 46 is arranged in the fixing sleeve 47 and can move axially along the inner core rod 45 relative to the fixing sleeve 47, the fixing sleeve 47 is fixed on the side cover 11, a core head 451 for a side hole inner cavity of the molded product 100 is arranged at one end of the inner core rod 45 near the second external thread 422, and two end faces of the threaded core rod 42 are respectively in limit abutment with the fixing block 46 and the core head 451.
Specifically, in the injection molding, the core 451 of the inner core rod 45 is used for molding in the inner cavity of the side hole, and the second external thread 422 of the threaded core rod 42 is used for molding in the inner tooth of the side hole of the product 100, wherein the shape of the core 451 may be set according to the shape of the product 100 to be injection molded, for example, as shown in fig. 5, the core 451 is set to be stepped, and accordingly, the inner cavity of the stepped hole shape may be molded. The fixing block 46 is provided with a through hole for inserting the end of the inner core rod 45, the fixing block 46 is further provided with a key hole, and correspondingly, the end of the inner core rod 45 is provided with a key groove. During assembly, the inner core rod 45 is inserted into the hollow cavity of the threaded core rod 42, one end, far away from the core head 451, of the inner core rod 45 is inserted into the through hole of the fixing block 46, and then the fixing block 46 and the inner core rod 45 are fixed through the key strip 48, so that the assembly is simple and convenient. The side cover 11 is provided with an installation opening for installing the fixing sleeve 47, the fixing sleeve 47 can be fixed at the installation opening through a fastener (such as a screw, a pin and the like), the fixing block 46 is embedded in the fixing sleeve 47, the fixing block 46 is roughly elliptical, correspondingly, the inner hole of the fixing sleeve 47 is also elliptical, the fixing sleeve 47 can limit the rotation of the fixing block 46 and the inner core rod 45, and meanwhile, the fixing block 46 can move axially relative to the fixing sleeve 47 along the inner core rod 45. In the process of opening the mold, the threaded core rod 42 rotates and retreats to perform the thread removing action, and the inner core rod 45 only retreats along the axial direction under the driving of the threaded core rod 42 without rotating, so that the product 100 can be prevented from being damaged, and the quality of the product 100 can be ensured.
Referring to fig. 1, in one embodiment, one end of the rack 20 is provided with a connecting block 21, two opposite sides of the connecting block 21 are respectively provided with a guide wheel 22, and the guide wheels 22 are slidably engaged with the front mold plate 70 to enable the connecting block 21 to slide back and forth along the core pulling direction. Specifically, as shown in fig. 2 and 4, the rack 20 may be connected to the connecting block 21 by a first pin 23, and the guide wheel 22 may be connected to the connecting block 21 by a second pin 24. The guide wheel 22 is in contact with the front mold plate 70 to reciprocate along the trajectory line 25 shown in fig. 1. The guide wheel 22 is arranged to make the sliding fit between the connecting block 21 and the front mold plate 70 smoother, so as to ensure that the rack 20 can move synchronously with the slider holder 10 more smoothly when the slider holder 10 moves.
Further, please refer to fig. 2 and fig. 6, the thread core-pulling mechanism further includes a guide bar 13, the guide bar 13 is fixedly connected with the rear mold plate 80, a boss is disposed on a side portion of the slider seat 10, and the guide bar 13 is matched with the boss to guide the movement of the slider seat 10 along the core-pulling direction. Specifically, the guide bar 13 extends along the core pulling direction, and the guide bar 13 is pressed on a boss at the side of the slider seat 10, so that the slider seat 10 can be well guided during core pulling movement. Optionally. Two guide bars 13 are provided, and the two guide bars 13 are respectively located at two opposite sides of the slider holder 10.
Referring to fig. 1 and 4, in one embodiment, a clamping block 12 is disposed on a side of the slider seat 10 close to the front mold plate 70, a groove matched with the clamping block 12 is disposed on the front mold plate 70, and the clamping block 12 is embedded in the groove when the injection mold is in a mold clamping state. Therefore, the sliding block seat 10 can be effectively prevented from sliding and retreating in the injection molding process, so that the injection molding quality is ensured.
In addition, referring to fig. 6, the threaded core-pulling mechanism further includes a mold-opening stroke control rod 90, one end of the mold-opening stroke control rod 90 is connected to the front mold plate 70, the other end of the mold-opening stroke control rod penetrates through the rear mold plate 80, a limiting groove is formed in the rear mold plate 80, and a limiting flange matched with the limiting groove is formed at the end of the mold-opening stroke control rod 90. In the mold opening process, the front mold plate 70 and the rear mold plate 80 are gradually separated, the front mold plate 70 drives the mold opening stroke control rod 90 to move along the mold opening direction until the limit flange at the end of the mold opening stroke control rod 90 is in butt fit with the limit groove on the rear mold plate 80 to complete the mold opening action, and the mold opening stroke of the injection mold can be accurately controlled through the mold opening stroke control rod 90. As shown in fig. 6, a distance L between the limiting flange of the mold opening stroke control rod 90 and the limiting groove on the rear mold plate 80 is the mold opening stroke of the injection mold.
Referring to fig. 1 again, in one embodiment, the driving assembly 60 includes a driving member 61, a fixing seat 62, a connecting rod 63 and a mounting block 64, the driving member 61 is mounted on the fixing seat 62, one end of the connecting rod 63 is fixedly connected to the driving end of the driving member 61, and the other end is fixedly connected to the slider seat 10 through the mounting block 64. The driving member 61 drives the connecting rod 63 to perform a telescopic motion, so as to drive the slider seat 10 to reciprocate along the core-pulling direction. The driving member 61 may be a cylinder or an air cylinder. For example, in the present embodiment, the driving member 61 is a cylinder.
The invention further provides an injection mold, which comprises the thread core-pulling mechanism in any embodiment. The specific structure of the thread core-pulling mechanism can refer to the above embodiments, and is not described in detail herein. The injection mold adopts the thread core-pulling mechanism, so that the space of the injection mold is optimized, the volume of the injection mold can be reduced, the volume of an injection molding machine is favorably reduced, the energy consumption is reduced, and the energy conservation and the environmental protection are more favorably realized.
Alternatively, as shown in fig. 4, the injection mold includes two sets of threaded core-pulling mechanisms, which are symmetrically arranged and can perform the thread stripping and core pulling actions on two opposite sides of the same product 100.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a screw thread mechanism of loosing core for injection mold, injection mold includes preceding template and back template, its characterized in that, the screw thread mechanism of loosing core includes:
the sliding block seat is arranged in a cavity formed by enclosing the front template and the rear template;
one end of the rack is connected with the front template in a sliding mode, and the other end of the rack penetrates through the sliding block seat;
the gear transmission assembly is mounted on the sliding block seat;
the core rod assembly comprises a thread sleeve and a thread core rod, the thread sleeve is fixed on the sliding block seat, the thread core rod is rotatably arranged on the sliding block seat, one end of the thread core rod is provided with a first external thread in threaded fit with the thread sleeve, the other end of the thread core rod is provided with a second external thread used for an internal thread of a side hole of a molded product, the thread core rod is also provided with a transmission tooth, and the transmission tooth is in transmission connection with the rack through the gear transmission assembly; a side cover is fixed on the open side of the sliding block seat, the threaded core rod is provided with a central cavity with two through ends, the core rod assembly further comprises an inner core rod, a fixing block and a fixing sleeve, the inner core rod penetrates through the central cavity, the fixing block is fixed at one end, close to the first external thread, of the inner core rod, the fixing block is arranged in the fixing sleeve and can move axially along the inner core rod relative to the fixing sleeve, the fixing sleeve is fixed on the side cover, and a core head used for forming a side hole inner cavity of the product is arranged at one end, close to the second external thread, of the inner core rod;
one end of the side hole core pulling rod is connected with the sliding block seat, and the other end of the side hole core pulling rod is used for forming a side hole of the product; and
and the driving assembly is used for driving the sliding block seat to reciprocate along the core-pulling direction.
2. The threaded core pulling mechanism according to claim 1, wherein the gear transmission assembly comprises a first transmission gear, a second transmission gear, and a transmission rod coaxially connecting the first transmission gear and the second transmission gear, the transmission rod is rotatably mounted to the slider seat, the first transmission gear is engaged with the rack, and the second transmission gear is engaged with the transmission teeth.
3. The threaded core-pulling mechanism according to claim 2, wherein the slider holder is provided with an inner cavity with an opening at one side, a mounting cavity for mounting the gear transmission assembly, the core rod assembly and the side hole core-pulling rod is defined between the side cover and the slider holder, and the same ends of the threaded core rod and the side hole core-pulling rod respectively penetrate out of one surface of the slider holder far away from the side cover.
4. The threaded core-pulling mechanism according to claim 3, wherein two end faces of the threaded core bar are in limit abutment with the fixing block and the core print respectively.
5. The threaded core pulling mechanism according to claim 1, wherein a connecting block is provided at one end of the rack, guide wheels are provided at opposite sides of the connecting block, respectively, and the guide wheels are slidably engaged with the front mold plate to enable the connecting block to slide back and forth in the core pulling direction.
6. The threaded core pulling mechanism according to claim 1, further comprising a guide bar fixedly connected to the rear mold plate, wherein a boss is provided on a side of the slider seat, and the guide bar cooperates with the boss to guide movement of the slider seat in the core pulling direction.
7. The threaded core-pulling mechanism according to claim 1, wherein a wedge block is arranged on one side of the slider seat close to the front mold plate, a groove matched with the wedge block is arranged on the front mold plate, and the wedge block is embedded in the groove when the injection mold is in a mold closing state.
8. The threaded core pulling mechanism according to claim 1, further comprising a die opening stroke control rod, wherein one end of the die opening stroke control rod is connected with the front die plate, the other end of the die opening stroke control rod penetrates through the rear die plate, a limiting groove is formed in the rear die plate, and a limiting flange matched with the limiting groove is arranged at the end of the die opening stroke control rod.
9. A threaded core-pulling mechanism according to any one of claims 1 to 8, wherein the driving assembly comprises a driving member, a fixed seat, a connecting rod and a mounting block, the driving member is mounted on the fixed seat, one end of the connecting rod is fixedly connected with the driving end of the driving member, and the other end of the connecting rod is fixedly connected with the sliding block seat through the mounting block.
10. An injection mold comprising the thread core-pulling mechanism according to any one of claims 1 to 9.
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