CN111805848A

CN111805848A - Internal thread tapping structure and die applying same

Info

Publication number: CN111805848A
Application number: CN202010639540.XA
Authority: CN
Inventors: 王涛; 李晶
Original assignee: Shenzhen Jingding Packaging Materials Co ltd
Current assignee: Shenzhen Jingding Packaging Materials Co ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-23
Anticipated expiration: 2040-07-06
Also published as: CN111805848B

Abstract

The application relates to an internal thread tapping structure and a die applying the same, wherein the internal thread tapping structure comprises a thread column and a nut sleeve, a first thread and a second thread are respectively arranged on the circumferential side surface of the thread column at two ends close to the thread column, and the thread column penetrates through the nut sleeve and is in thread fit with the nut sleeve through the first thread; the second screw thread is used for tapping the internal screw thread on the inner wall of the pipe product, and the rotating directions of the first screw thread and the second screw thread are opposite. This application has the effect that makes injection moulding's pipe class plastic products internal thread shaping simpler, reduce the time that consumes.

Description

Internal thread tapping structure and die applying same

Technical Field

The application relates to the field of a thread tapping structure, in particular to an internal thread tapping structure and a die applying the same.

Background

In the plastic product, the common mode of its production is mostly injection moulding, and the equipment that uses is the injection molding machine, is provided with forming die on the injection molding machine, and after the forming die compound die, pour into the inside die cavity of forming die with the plastics raw materials of molten state through the notes gluey hole on the forming die, treat that the plastics of molten state cools off after finalizing the design, the fashioned plastic product of die sinking takes out again.

After some plastic products of pipes are produced in an injection molding mode, in order to facilitate threaded connection with other parts, internal threads are additionally tapped at the positions, close to the end parts, of the inner walls of the plastic products of pipes, so that the plastic products of pipes are matched with the external threads on the other parts through the internal threads, and the purpose of threaded connection of the plastic products of pipes and the other parts is achieved.

In view of the above-mentioned related technologies, the inventor believes that there is a defect that the internal thread formation of the injection molded plastic pipe product is troublesome and time-consuming.

Disclosure of Invention

In order to make injection moulding's pipe class plastic products internal thread shaping simpler, reduce the time that consumes, this application provides the mould of structure and applied this structure is attacked to internal thread.

In a first aspect, the application provides an internal thread tapping structure, which adopts the following technical scheme:

an internal thread tapping structure comprises a threaded column and a nut sleeve, wherein first threads and second threads are respectively arranged on the circumferential side surface of the threaded column at two ends close to the threaded column, and the threaded column penetrates through the nut sleeve and is in threaded fit with the nut sleeve through the first threads; the second screw thread is used for tapping the internal screw thread on the inner wall of the pipe product, and the rotating directions of the first screw thread and the second screw thread are opposite.

By adopting the technical scheme, the nut sleeve is firstly fixed, so that the nut sleeve cannot rotate around the axis of the threaded column, when a pipe type plastic product is molded, the position of the internal thread on the pipe type plastic product, which needs to be tapped, covers the position of the second thread on the threaded column, after the pipe type plastic product is shaped, the pipe type plastic product is pulled along the axis direction of the threaded column in the direction away from the threaded column, so that the pipe type plastic product is separated from the threaded column, when the pipe type plastic product is pulled, the threaded column can rotate around the axis of the nut sleeve through the first thread because the threaded sleeve is limited to rotate, and because the rotation direction of the second thread is opposite to that of the first thread, when the threaded column rotates, the position on the threaded column, which is wrapped by the pipe type plastic product, can be separated from the pipe type plastic product, and simultaneously, the internal thread is cut on the inner wall of the pipe type plastic product, compared with the mode that the internal thread is cut after the pipe type product is molded, this kind of design combines together the shaping of product and the shaping of internal thread, just also need not follow-up to go to open the internal thread in addition again, has reduced the action of operation for the internal thread is seted up more simple and conveniently, and then saves time more, and the rotation of screw thread post also need not be similar to the device such as motor, pneumatic cylinder or cylinder and provides power in addition, helps reducing the cost of preparation, and the structure is also simpler to a certain extent.

Preferably, the helix angle of the first thread is at least 45 degrees.

Through adopting above-mentioned technical scheme for the screw thread post is when receiving the axial force, can be more light by the pulling, is difficult for when receiving the axial force and by the lock, helps pipe type plastic products when separating with the screw thread post, and the screw thread post rotates around self axis and at the inside internal thread that forms of pipe type plastic products.

Preferably, a partition is arranged between the first thread and the second thread, the partition is arranged in a circular ring shape around the axis of the threaded column on the circumferential side surface of the threaded column, and the end face of one end, close to the first thread, of the partition forms a barrier with the nut sleeve.

Through adopting above-mentioned technical scheme, the setting of separator not only separates first screw thread and second screw thread is fine, but also makes the screw thread post be difficult for upwards breaking away from the nut cover completely, helps the screw thread post once to get back to the normal position after tapping the internal thread so that use next time, still makes the raw materials of melt form simultaneously difficult second screw thread to first screw thread department of crossing to the separation of second screw thread and pipe type shaping product.

Preferably, the diameter of the end part of the separating piece close to the nut sleeve is smaller than the diameter of the end part of the separating piece close to the second thread.

By adopting the technical scheme, the raw materials for forming the separator are saved, and the end with the large diameter of the separator can better prevent the raw materials in a molten state from passing through the second thread.

Preferably, a partition portion is provided between the partition member and the first thread, and the partition portion is located inside the nut sleeve when the partition member abuts against the nut sleeve.

Through adopting above-mentioned technical scheme, the setting of partition portion for when separator and nut cover butt, the screw thread post is difficult to be died by first screw thread lock, so that the screw thread post can be more free rotate around self axis through first screw thread, and then can be more convenient and fast's tapping through the internal thread on the second screw thread with pipe class plastic products.

Preferably, the nut sleeve is provided with a third thread matched with the first thread, the width of the upper crest of the third thread is smaller than that of the bottom of the thread, and the width of the upper crest of the first thread is smaller than that of the bottom of the thread.

Through adopting above-mentioned technical scheme for the thread of second screw thread in the thread groove of third screw thread, when the thread of third screw thread is in the thread groove of second screw thread, the thread can be along the axis of screw post in the thread groove at certain extent activity, and the screw post just also rotates around self axis more easily when receiving the power along the axis direction this moment, so that open out the internal thread on pipe class plastic products.

Preferably, a limiting block is fixedly arranged on the outer side surface of the nut sleeve and used for limiting the nut sleeve to rotate around the axis of the threaded column.

Through adopting above-mentioned technical scheme, the setting of stopper for nut cover only needs to restrict the stopper when the installation, just can reach the purpose that restriction nut cover is difficult for rotating around the screw post axis, compares in restricting whole nut cover, and it can be easier a bit relatively only to restrict the stopper.

In a second aspect, the present application provides a mold using the structure, which adopts the following technical scheme:

a mould applying the structure comprises an upper mould and a lower mould, wherein the upper mould and the lower mould are arranged up and down correspondingly; the upper die comprises an upper forming die and a fixing sleeve, the upper forming die is vertically opposite to the lower die, the fixing sleeve is arranged on the surface of one side, away from the lower die, of the upper forming die, the threaded column is vertically movably arranged in the fixing sleeve (32), the nut sleeve is fixedly arranged at the upper forming die, and the surface of the upper end of the nut sleeve is pressed by the lower end of the fixing sleeve.

By adopting the technical scheme, after the upper die and the lower die are assembled, the plastic raw material in a molten state can be injected into a cavity between the upper die and the lower die, when the shaping of the pipe plastic product is finished, the position of the pipe plastic product, which is required to be provided with the internal thread, can wrap the position of the second thread on the threaded column, when the die is opened after the shaping of the pipe plastic product is finished, the pipe plastic product moves downwards along with the lower die, the threaded column and the nut sleeve move upwards along with the upper die, the threaded column can rotate around the axis of the threaded column due to the existence of the nut sleeve and the first thread, so that the internal thread on the pipe plastic product is provided with the second thread, and meanwhile, due to the fact that the first thread and the second thread have opposite rotating directions, when the threaded column rotates around the axis of the threaded column, the position of the second thread on the threaded column can be separated from the pipe plastic product, and then directly taking the pipe plastic product with the internal thread from the lower die.

Preferably, the circumferential side surface of the threaded column is fixedly provided with a limiting part at one end far away from the second thread, and the limiting part and the upper end surface of the nut sleeve form a separation block.

Through adopting above-mentioned technical scheme, when the internal thread of screw post on with the pipe class product is opened through the second screw thread, the screw post both need rotate around self axis, need follow self axis direction one section distance of motion again, and the setting of locating part, then neither can influence the screw post and rotate around self axis, can let self follow self axis direction motion in certain extent again, accord with the screw post completely and set up the internal screw thread operation requirement on pipe class plastic products, and the screw post still can not break away from completely from the nut cover when using, can make things convenient for next time to use.

Preferably, a resetting piece is fixedly arranged inside the threaded column, the resetting piece extends along the axis of the threaded column, and the lower end part of the resetting piece exceeds the end part of the threaded column, which is close to one end of the second thread; and an ejector rod is vertically and fixedly arranged on the lower die, and when the upper die and the lower die are closed, the upper end part of the ejector rod pushes the lower end part of the reset piece to move upwards.

Through adopting above-mentioned technical scheme, reset the setting of piece and ejector pin for when going up mould and lower mould compound die, the ejector pin can move through the top and reset the piece and upwards push back original position department with the screw thread post, so that later the screw thread post need open the internal thread position department and open the internal thread on pipe type plastic products, this kind of design makes things convenient for screw thread post reuse.

Drawings

Fig. 1 is a schematic view of an overall structure of an internal thread tapping structure in an embodiment of the present application.

Fig. 2 is a schematic cross-sectional view of a die with an internal thread tapping structure mounted therein in the embodiment of the present application.

Fig. 3 is an enlarged schematic view of a structure at a in fig. 2.

Description of reference numerals: 1. a threaded post; 11. a first thread; 12. a second thread; 13. a separator; 14. a partition portion; 15. a limiting member; 16. a reset member; 2. a nut sleeve; 21. a third thread; 22. a limiting block; 3. an upper die; 31. an upper forming die; 311. mounting grooves; 312. a limiting groove; 32. fixing a sleeve; 4. a lower die; 41. and a push rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses an internal thread tapping structure. Referring to fig. 1, the internal thread tapping structure includes a threaded column 1 and a nut sleeve 2, the threaded column 1 and the nut sleeve 2 are both made of stainless steel, the threaded column 1 is cylindrical, the nut sleeve 2 may be in a ring shape or a square ring shape, and in this embodiment, the nut sleeve 2 is in a ring shape; the peripheral side surface of the threaded column 1 is provided with a first thread 11 and a second thread 12 at two ends close to the threaded column 1, and the threaded column 1 penetrates through a hole in the nut sleeve 2 and is in threaded fit with the nut sleeve 2 through the first thread 11; the second thread 12 is used for tapping internal threads on the inner wall of a pipe product, and the first thread 11 and the second thread 12 are opposite in rotation direction.

Referring to fig. 1, when a pipe plastic product is in a soft state, the pipe plastic product needs to be provided with an internal thread at a position to wrap a second thread 12 of a threaded column 1, after the pipe plastic product is shaped, the pipe plastic product is pulled along the axis direction of the threaded column 1 to move the pipe plastic product in a direction away from the threaded column 1, at this time, due to the existence of a nut sleeve 2 and a first thread 11, the threaded column 1 can rotate around the axis of the pipe plastic product, and due to the fact that the rotation direction of the first thread 11 is opposite to that of the second thread 12, the position of the second thread 12 on the threaded column 1 can be separated from the pipe plastic product, and the internal thread is provided on the pipe plastic product at the same time, in this design mode, the pipe plastic product is formed and the internal thread is opened together, and the pipe plastic product does not need to be taken out of the internal thread afterwards, so that the operation action is saved, make this work simple more convenient, the rotation of screw thread post 1 need not be similar to the device such as motor, pneumatic cylinder or cylinder in addition provides power, helps reducing the cost of preparation, and the structure is also simpler to a certain extent.

Referring to fig. 1, the first thread 11 includes four threads parallel to each other around the axis of the threaded post 1, and the lead angle of the first thread 11 is at least 45 degrees, and may be 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, or 85 degrees, and in the present embodiment, the lead angle of the first thread 11 is 60 degrees.

Referring to fig. 1, a spacer 13 is integrally arranged between the first thread 11 and the second thread 12, the spacer 13 is annularly arranged around the axis of the threaded column 1 on the circumferential side surface of the threaded column 1, and an end surface of the spacer 13 close to one end of the first thread 11 forms a barrier with the nut sleeve 2, so that the threaded column 1 is not easy to completely separate from the nut sleeve 2 after moving upwards; the diameter of the end part of the separating piece 13 close to the nut sleeve 2 is smaller than the diameter of the end part of the separating piece 13 close to the second thread 12, when the end opening of one end of the pipe-type plastic product is sleeved on the second thread 12 of the threaded column 1, the diameter of the end part of the separating piece 13 close to the second thread 12 is equal to the outer diameter of the end part of the pipe-type plastic product close to the threaded column 1, and compared with the case that the separating part 14 is not arranged, raw materials in a molten state are not easy to spread to the nut sleeve 2 beyond the separating part 14.

Referring to fig. 1, a partition portion 14 is further provided between the partition 13 and the first thread 11, the partition portion 14 is formed as a gap between the partition 13 and the first thread 11, and when the partition 13 abuts against the nut sleeve 2, the partition portion 14 is located inside the nut sleeve 2; partition 14 sets up for when separator 13 and nut cover 2 butt, the difficult dead circumstances of lock that appears in first screw thread 11 department of screw post 1 helps later screw post 1 precession downwards, when screw post 1 received the effort along self axis direction, can let screw post 1 more conveniently appear around self axis pivoted circumstances simultaneously.

Referring to fig. 1, the second thread 12 has a direction opposite to that of the internal thread formed on the plastic product of the pipe type so as to form the internal thread.

Referring to fig. 1, a third thread 21 matched with the first thread 11 is formed on the inner wall of a hole in the nut sleeve 2, the third thread 21 is also composed of four threads parallel to each other, the width of the upper crest of the third thread 21 is smaller than the width of the bottom of the thread, the width of the upper crest of the first thread 11 is also smaller than the width of the bottom of the thread, so that when the first thread 11 is matched with the third thread 21, the threads of the first thread 11 can have a certain moving space in the thread groove of the third thread 21, the threads of the third thread 21 can have a certain moving space in the thread groove of the first thread 11, and at the moment, the first thread 11 is not too close to the third thread 21, so that the threaded column 1 can more conveniently rotate around the axis when receiving acting force along the axis direction.

Referring to fig. 1, a limiting block 22 is further inserted into the outer side surface of the nut sleeve 2, in this embodiment, the limiting block 22 is disposed on the outer surface of the nut sleeve 2 on the shaft side, the limiting block 22 is columnar and made of stainless steel, and the limiting block 22 is used for limiting the nut sleeve 2 to rotate around the axis of the threaded column 1; because of stopper 22 is the ring shape, after the installation, nut cover 2 still appears around self axis pivoted condition when receiving tangential direction's power easily, so stopper 22's setting can play the effect of restriction nut cover 2 around self axis is rotatory to a certain extent.

Referring to fig. 2 and 3, a mold having the above structure is provided, and includes an upper mold 3 and a lower mold 4, which are disposed to correspond to each other up and down to the lower mold 4; the upper die comprises an upper forming die 31 and a fixing sleeve 32, the upper forming die 31 is vertically opposite to the lower die 4, and a cavity is formed between the upper forming die and the lower die after the upper forming die and the lower die are assembled; the fixing sleeve 32 is in a circular tube shape and made of stainless steel, the axis of the fixing sleeve 32 is vertically arranged, the upper end of the fixing sleeve 32 is fixed on a die holder above the upper forming die 31 through a screw and a flange plate, and the threaded column 1 is vertically movably arranged in the fixing sleeve 32.

Referring to fig. 2 and 3, a limiting member 15 is welded on the circumferential side surface of the threaded post 1 at one end away from the second thread 12, the limiting member 15 may be in a ring shape, the ring-shaped limiting member 15 is sleeved on the threaded post 1 and welded to the threaded post 1, or may be in a cylindrical shape, the cylindrical limiting member 15 penetrates through the axial side outer surface of the threaded post 1 and is welded to the threaded post 1, in this embodiment, the limiting member 15 is in a cylindrical shape, and a part of the limiting member 15 located outside the threaded post 1 and an upper end surface of the nut sleeve 2 form a barrier; a gap exists between the limiting piece 15 and the inner wall of the fixing sleeve 32, and the limiting piece 15 can rotate around the axis of the threaded column 1 in the fixing sleeve 32 and can also slide along the axis of the threaded column 1 in the fixing sleeve 32.

Referring to fig. 2 and 3, when the threaded post 1 rotates around its axis, the threaded post 1 rotates and moves downward, and at this time the limiting member 15 also rotates in the fixing sleeve 32 and slides downward, and at the same time, because the upper end surface of the nut sleeve 2 and the limiting member 15 form a barrier, the threaded post 1 is not easy to completely disengage from the nut sleeve 2, so that the threaded post 1 is subsequently restored to the original position, and the threaded post 1 is conveniently reused next time.

Referring to fig. 2 and 3, the nut sleeve 2 is fixedly arranged on the upper forming die 31 through the limiting block 22, a mounting groove 311 is formed in the surface of one side of the upper forming film, which is far away from the lower die 4, the mounting groove 311 is matched with the nut sleeve 2, the surface of one side of the nut sleeve 2, which is far away from the bottom of the mounting groove 311, is flush with the surface of one side of the upper forming film, which is far away from the lower die 4, and the end of the lower end of the fixing sleeve 32 is abutted against the end surface of the nut; still seted up a restriction groove 312 on the surface of last shaping film one side far away from lower mould 4, restriction groove 312 one side and mounting groove 311 intercommunication, restriction groove 312 and stopper 22 looks adaptation, when nut cover 2 is in mounting groove 311, stopper 22 is in restriction groove 312 to the axle side surface of stopper 22 and the lateral wall butt in restriction groove 312 make nut cover 2 when receiving the effort along self tangential direction, the difficult condition of appearing around self axis rotation.

Referring to fig. 2 and 3, when the threaded column 1 is separated from the tubular plastic product, the threaded column 1 is screwed downwards, so that internal threads are formed on the tubular plastic product for the convenience of subsequent continuous use of the threaded column 1, a resetting piece 16 is welded inside the threaded column 1, the resetting piece 16 is cylindrical and made of stainless steel, the axis of the resetting piece 16 is overlapped with the axis of the threaded column 1, the resetting piece 16 extends along the axis of the threaded column 1, and the lower end part of the resetting piece 16 exceeds the end part of the threaded column 1 close to one end of the second thread 12; the ejector rod 41 is vertically and fixedly arranged on the surface of one side, close to the upper die, of the lower die 4, the ejector rod 41 is a core, the ejector rod 41 is located in a die cavity, the ejector rod 41 is fixed through a bolt, and when the upper die and the lower die 4 are closed, the upper end part of the ejector rod 41 pushes the lower end part of the reset piece 16 to move upwards, so that the threaded column 1 moves upwards to the initial position, and the threaded column 1 is utilized subsequently again.

The implementation principle of the die of the internal thread tapping structure and the application of the structure in the embodiment of the application is as follows: when the upper die and the lower die 4 are matched, the ejector rod 41 can upwards eject the reset piece 16, so that the threaded column 1 is subjected to an upward acting force along the axis, at the moment, due to the existence of the nut sleeve 2 and the first threads 11, the threaded column 1 can upwards screw around the axis of the threaded column 1, and after the matched die action is completed, the threaded column 1 returns to the initial position and stops upwards screwing.

And then, injecting a molten plastic raw material into the cavity through a glue injection hole on the mold, so that the molten plastic raw material forms the shape of a tubular plastic product on one hand, and the upper end port of the tubular plastic product can be sleeved on the second thread 12 of the threaded column 1 on the other hand, and opening the mold after the molten plastic raw material is cooled and shaped.

When the die is opened, the lower die 4, the pipe plastic products and the ejector rod 41 all move downwards, the upper die and the internal thread tapping structure move upwards, at the moment, because the pipe plastic products pull the threaded column 1 downwards, the threaded column 1 is acted by downward force along the self axis, and the threaded column 1 is screwed downwards around the self axis due to the existence of the nut sleeve 2 and the first thread 11, meanwhile, as the second thread 12 and the first thread 11 are opposite in rotation direction, the threaded column 1 is separated from the pipe plastic product at the second thread 12 as the pipe plastic product moves downwards, and simultaneously, the internal thread is formed on the pipe plastic product, after the die opening action is completed, the pipe plastic product is completely separated from the threaded column 1, at the moment, the pipe plastic product can be taken down from the lower die 4, and the pipe plastic product is formed and the internal thread is tapped simultaneously.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An internal thread tapping structure is characterized in that: the nut comprises a threaded column (1) and a nut sleeve (2), wherein first threads (11) and second threads (12) are respectively arranged on the circumferential side surface of the threaded column (1) at two ends close to the threaded column, and the threaded column (1) penetrates through the nut sleeve (2) and is in threaded fit with the nut sleeve (2) through the first threads (11); the second thread (12) is used for tapping internal threads on the inner wall of a pipe product, and the rotating directions of the first thread (11) and the second thread (12) are opposite.

2. The internal thread tapping structure according to claim 1, wherein: the helix angle of the first thread (11) is at least 45 degrees.

3. The internal thread tapping structure according to claim 1, wherein: a separating piece (13) is arranged between the first thread (11) and the second thread (12), the separating piece (13) is arranged on the circumferential side surface of the threaded column (1) in a circular ring shape around the axis of the threaded column (1), and the end face of one end, close to the first thread (11), of the separating piece (13) and the nut sleeve (2) form a separation block.

4. The internal thread tapping structure according to claim 3, wherein: the diameter of the end part of the separating piece (13) close to one end of the nut sleeve (2) is smaller than that of the end part of the separating piece (13) close to one end of the second thread (12).

5. The internal thread tapping structure according to claim 3, wherein: a partition part (14) is arranged between the partition (13) and the first thread (11), and when the partition (13) is abutted against the nut sleeve (2), the partition part (14) is positioned inside the nut sleeve (2).

6. The internal thread tapping structure according to claim 1, wherein: and a third thread (21) matched with the first thread (11) is arranged on the nut sleeve (2), the top width of the upper thread of the third thread (21) is smaller than the bottom width, and the top width of the upper thread of the first thread (11) is smaller than the bottom width.

7. The internal thread tapping structure according to claim 1, wherein: the outer side surface of the nut sleeve (2) is fixedly provided with a limiting block (22), and the limiting block (22) is used for limiting the nut sleeve (2) to rotate around the axis of the threaded column (1).

8. A die using the structure, based on the internal thread tapping structure of any one of claims 1 to 7, wherein: the mould comprises an upper mould (3) and a lower mould (4), and the upper mould and the lower mould (4) are arranged up and down correspondingly; the upper die comprises an upper forming die (31) and a fixing sleeve (32), the upper forming die (31) is vertically opposite to the lower die (4), the fixing sleeve (32) is arranged on the surface of one side, away from the lower die (4), of the upper forming die (31), the threaded column (1) is vertically movably arranged in the fixing sleeve (32), the nut sleeve (2) is fixedly arranged at the upper forming die (31), and the surface of the upper end of the nut sleeve is pressed by the lower end of the fixing sleeve (32).

9. The mold for applying a structure according to claim 8, wherein: the circumferential side surface of the threaded column (1) is fixedly provided with a limiting piece (15) at one end far away from the second thread (12), and the limiting piece (15) and the upper end surface of the nut sleeve (2) form a separation block.

10. The mold for applying a structure according to claim 8, wherein: a resetting piece (16) is fixedly arranged in the threaded column (1), the resetting piece (16) extends along the axis of the threaded column (1), and the lower end part of the resetting piece (16) exceeds the end part of the threaded column (1) close to one end of the second thread (12); and an ejector rod (41) is vertically and fixedly arranged on the lower die (4), and when the upper die and the lower die (4) are closed, the upper end part of the ejector rod (41) pushes the lower end part of the reset piece (16) to move upwards.