CN111890639A

CN111890639A - Spiral demolding structure

Info

Publication number: CN111890639A
Application number: CN202011062631.8A
Authority: CN
Inventors: 王龙胜; 郑海笑; 郭剑康
Original assignee: Ningbo Junsheng Qunying Automobile System Co Ltd
Current assignee: Ningbo Junsheng Qunying Automobile System Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-11-06
Anticipated expiration: 2040-09-30
Also published as: CN111890639B

Abstract

The invention discloses a spiral demolding structure, and belongs to the technical field of injection molds. Including thread pole, thread bush, mold insert, back template, power unit, drive mechanism, carve tight slider and lifting mechanism, the thread bush is fixed on the back template, the thread pole can be at the thread bush internal rotation, power unit drives the rotation of thread pole through drive mechanism, thread pole bottom is equipped with carves tight slider, but lifting mechanism lifting carves tight slider and carves tight thread pole, the thread pole top is equipped with the mold insert of block. Aiming at the problem that the gap is very easy to appear on the thread rod collision surface of the spiral demolding structure in the prior art, and the flash of the injection molding product is very easy to appear, the lifting mechanism is additionally arranged on the bottom surface of the thread rod, so that the technical problem that the gap is very easy to appear on the thread rod top collision surface, so that the flash of the product is very easy to appear is solved, and the reject ratio of the product is greatly reduced.

Description

Spiral demolding structure

Technical Field

The invention relates to the technical field of injection molds, in particular to a spiral demolding structure.

Background

When the injection molded product involves threaded holes, it is common in the mold industry to use spiral demolding structures for manufacturing. And after the injection molding is finished, the screw thread rod in the spiral demolding structure performs spiral action in the screw thread sleeve and is screwed out of the threaded hole of the product. The thread rod is fixed and withstands the injection pressure through the thread of the thread sleeve in the die assembly and injection molding state. Because the thread sleeve and the thread rod need to rotate, a certain fit clearance exists, and the collision surface at the top of the thread rod is easy to have a clearance, so that the injection molding product is easy to have flash, and the reject ratio of the product is improved in the production process.

Disclosure of Invention

The invention provides a spiral demolding structure, aiming at the technical problem that the burr of an injection molding product is easy to run due to the fact that a gap is easy to occur on the thread rod collision surface of the spiral demolding structure in the prior art.

In order to solve the problems, the technical scheme provided by the invention is as follows:

the utility model provides a spiral demolding structure, includes thread pole, thread bush, mold insert, back template, power unit, drive mechanism, carves tight slider and lifting mechanism, the thread bush is fixed on the template of back, the thread pole can be at thread bush internal rotation, power unit drives the rotation of thread pole through drive mechanism, thread pole bottom is equipped with carves tight slider, lifting mechanism can be lifted carve tight slider and carve tight thread pole, thread pole top is equipped with the mold insert of looks block.

And the thread which is matched with the surface of the screw rod is arranged in the screw thread sleeve. One end of the insert is fixed on the front template, and the other end of the insert can be attached to the top of the screw thread rod. The periphery of the joint of the collision penetrating surface of the insert and the top of the screw rod is a product forming area, when injection molding liquid is sprayed into the product forming area through an injection molding hole, if the collision penetrating surface of the insert and the top of the screw rod is not tightly jointed with each other, a gap is formed, the injection molding liquid can flow into the gap, so that the injection molding product has flash, and the product is unqualified. When the mold is closed and injection molding is carried out, the tight wedge sliding block is attached to the bottom of the screw thread rod under the action of the lifting mechanism to wedge the tight screw thread rod, the screw thread rod can be firmly attached to the mold insert due to the wedge tight action of the thread sleeve and the wedge tight action of the tight wedge sliding block, the mold insert is prevented from colliding with the top of the screw thread rod to form a gap at the junction of the penetrating surface, and the injection molding product is prevented from being flapped. After the injection molding is finished, the lifting mechanism does not lift the wedging sliding block any more, and the wedging sliding block falls back to release the wedging force on the screw thread rod. The power mechanism drives the screw thread rod to be screwed out of the injection molding product through the transmission mechanism, and the injection molding of the product is completed.

Optionally, the lifting mechanism comprises a first driving member and a wedging block fixed on an output shaft of the first driving member.

Optionally, a first driving surface is arranged on the wedging sliding block, a second driving surface which is abutted against the first driving surface is arranged on the wedging block, the wedging block is matched with the second driving surface through the first driving surface to drive the wedging sliding block to move up and down, and the wedging sliding block and the wedging block are provided with anti-falling structures.

Optionally, the wedging sliding block is provided with a guide hole, a guide pin penetrates through the guide hole, one end of the guide pin is fixed on the rear template, and a spring penetrates through one end of the guide pin, which is close to the rear template.

Optionally, a wear-resistant block is arranged at the joint where the first driving surface and the second driving surface abut, and a wear-resistant cover plate is arranged on the sliding plane of the wedging block.

Optionally, the lifting mechanism is a cylinder, a ram or an electric cylinder.

Optionally, one end of the insert is fixed on the front template, the other end of the insert is attached to the top of the threaded rod, and a through exhaust hole is formed in the insert.

Optionally, the thread of the screw thread rod matched with the thread sleeve is shorter than the thread in the thread sleeve, and the top of the screw thread rod is provided with the thread and extends into the product forming area.

Optionally, the wedging block is connected with a first driving piece through a driving medium, and the first driving piece is fixed on the rear mold base plate through a driving fixing block.

Optionally, the power mechanism is a motor, the transmission mechanism includes a first gear, a chain and a second gear, and the motor drives the threaded rod to rotate through the first gear, the chain and the second gear.

A spiral demolding structure comprises the following use steps:

A. constructing a spiral demolding structure;

B. before injection molding, the power mechanism is started, the power mechanism drives the first gear to rotate through the chain, the first gear is meshed with the second gear to drive the screw tooth rod to rotate and advance in the screw tooth sleeve until the top of the screw tooth rod is in collision with the penetrating surface and is tightly attached to the insert without a gap, and then the power mechanism is closed.

C. Then, the first driving piece is started, the first driving piece drives the wedging block to slide, the anti-falling part of the wedging block slides into the first groove of the wedging sliding block, the second driving surface of the wedging block is gradually attached to the first driving surface of the wedging sliding block, the attaching area is gradually increased, the wedging block gradually drives the wedging sliding block to be lifted, the spring is compressed until the wedging sliding block is contacted with the bottom of the thread rod, and the thread rod is wedged tightly.

D. After the injection molding is finished, the first driving piece drives the wedging block to enable the wedging sliding block to fall back. The spring is released by the compressed potential energy to further push the wedging sliding block to fall back. And then starting a power mechanism, wherein the power mechanism drives the screw thread rod to rotate in the screw thread sleeve through the transmission mechanism until the screw thread rod is screwed out of the product.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) according to the spiral demolding structure provided by the embodiment of the invention, the tight thread rod is wedged by the tight wedge sliding block through additionally arranging the lifting mechanism, so that the top of the thread rod is prevented from colliding with a penetrating surface to form a gap, the technical problem of flash running of an injection molding product is solved, and the product reject ratio is greatly reduced.

(2) According to the spiral demolding structure provided by the embodiment of the invention, the first driving surface and the second driving surface are matched to gradually drive the wedging sliding block to be lifted, so that the transverse motion of the driving piece is converted into the vertical motion, the driving piece can be prevented from being overlarge in stroke, and the lifting stability of the lifting mechanism is improved.

Drawings

FIG. 1 is an assembly view of a spiral demolding structure according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a spiral demolding structure according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a side B of a spiral demolding structure 2 according to an embodiment of the present invention;

FIG. 4 is a schematic view of a wedge-clamping slider of a spiral demolding structure according to an embodiment of the present invention;

fig. 5 is a schematic view of a wedging block of a spiral demolding structure according to an embodiment of the present invention.

The reference numerals in the schematic drawings illustrate:

1. a threaded rod; 2. a thread sleeve; 3. a rear template; 4. a power mechanism; 5. a chain; 6. a first gear; 7. wedging a sliding block; 71. a first groove; 8. a wedging block; 81. a T-shaped groove; 82. an anti-drop part; 9. a wear-resistant block; 10. a wear-resistant cover plate; 11. a driver meson; 12; a first driving member; 13. driving the fixed block; 14. a rear mold base plate; 15. a spring; 16. a guide pin; 17. an insert; 18. an exhaust hole; 19. injection molding holes; 20. a second gear; 21. and a front template.

Detailed Description

For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings 1-5 and examples.

Example 1

With reference to fig. 1-5, the spiral demolding structure of this embodiment includes a thread rod 1, a thread sleeve 2, an insert 17, a rear mold plate 3, a power mechanism 4, a transmission mechanism, a wedge tight slide 7, and a lifting mechanism, where the thread sleeve 2 is fixed on the rear mold plate 3, the thread rod 1 can rotate in the thread sleeve 2, the power mechanism 4 drives the thread rod 1 to rotate through the transmission mechanism, the wedge tight slide 7 is disposed at the bottom of the thread rod 1, the lifting mechanism can lift the wedge tight slide 7 and wedge the thread rod 1, and the insert 17 engaged with the top of the thread rod 1 is disposed at the top of the thread rod 1.

And the thread sleeve 2 and the surface of the thread rod 1 are provided with matched threads. One end of the insert 17 is fixed on the front template 21, and the other end of the insert 17 can be attached to the top collision surface of the screw thread rod 1. The periphery of the joint of the insert 17 and the top of the thread rod 1 is a product forming area, and when injection molding liquid is sprayed into the product forming area through the injection molding hole 19, if the joint of the insert 17 and the top of the thread rod 1 is not tight and has a gap, the injection molding liquid can flow into the gap to cause flash to occur in the injection molding product, so that the product is unqualified. When the mold is closed and injection molding is carried out, the tight sliding block 7 is adhered to the bottom of the thread rod 1 under the action of the lifting mechanism, the tight thread rod 1 is wedged, and the thread rod 1 can be firmly adhered to the insert 17 due to the tight wedging action of the threads of the thread sleeve 2 and the tight wedging action of the tight sliding block 7, so that a gap is prevented from being formed at the adhering position of the top collision penetrating surface of the insert 17 and the thread rod 1, and the injection molding product is prevented from being flanged. After the injection molding is finished, the lifting mechanism does not lift the wedge tight sliding block 7 any more, and the wedge tight sliding block 7 falls back to release the wedge tight force on the screw thread rod 1. The power mechanism 4 drives the thread rod 1 to be screwed out of the injection molding product through the transmission mechanism, and the injection molding of the product is completed.

Example 2

With reference to fig. 1-5, compared with the technical solution of embodiment 1, the lifting mechanism of the present embodiment includes a first driving member 12 and a wedge block 8 fixed on an output shaft of the first driving member 12. The first driving member 12 is an oil cylinder, an air cylinder or an electric cylinder, and the first driving member 12 can drive the wedging block 8 to move linearly by moving linearly. The wedging block 8 and the wedging sliding block 7 are provided with inclined planes which can be attached to each other, the wedging block 8 slides along the first driving piece 12 and slowly leans against the wedging sliding block 7, the contact area of the inclined planes is gradually increased, the wedging sliding block 7 is lifted at the same time, and the wedging sliding block 7 can be completely lifted to wedge the tight thread rod 1.

Example 3

With reference to fig. 1-5, compared with the technical solution of

embodiment

1 or 2, in the spiral demolding structure of this embodiment, the wedge tight sliding block 7 is provided with a first driving surface, the wedge tight block 8 is provided with a second driving surface abutting against the first driving surface, the wedge tight block 8 is matched with the second driving surface through the first driving surface to drive the wedge tight sliding block 7 to move up and down, and the wedge tight sliding block 7 and the wedge tight sliding block 8 are provided with an anti-disengaging structure.

The anti-falling structure comprises an anti-falling part 82 and a first groove 71, and the anti-falling part 82 and the first groove 71 can be matched with each other to prevent the wedge block 8 from falling off when driving the wedge sliding block 7 to move up and down; the second driving surface of the wedging block 8 is provided with an anti-falling part 82, and the first driving surface of the wedging slide block 7 is provided with a first groove 71. The first driving surface of the wedging sliding block 7 and the second driving surface of the wedging sliding block 8 have the same inclination and form an acute angle with the horizontal plane, except that the second driving surface of the wedging sliding block 8 is higher than the first driving surface of the wedging sliding block 7, the height of the lower end of the inclined surface of the wedging sliding block 8 is equal to that of the higher end of the inclined surface of the wedging sliding block 7, and the anti-falling part 82 can extend into the first groove 71 to be matched with the first groove 71 after the wedging sliding block 8 is close to the wedging sliding block 7. The anti-falling part 82 also slides in the first groove 71 when the wedging block 8 continues to slide, and along with the continued sliding of the wedging block 8, the contact area of the first driving surface and the second driving surface gradually increases, and the wedging slide block 7 is slowly lifted under the driving of the wedging block 8 until the wedging slide block contacts with the bottom of the thread rod 1 to wedge the thread rod 1. The surface of the wedge tight sliding block 7 contacting with the screw rod 1 is a plane, so that the screw rod 1 is prevented from inclining when the screw rod 1 is wedged tightly.

Example 4

With reference to fig. 1-5, in the spiral demolding structure of this embodiment, compared with any one of the technical solutions of embodiments 1-3, the wedging sliding block 7 is provided with a guide hole, the guide hole is penetrated with a guide pin 16, one end of the guide pin 16 is fixed on the rear mold plate 3, and one end of the guide pin 16 close to the rear mold plate 3 is penetrated with a spring 15. The guide pin 16 functions to limit the sliding direction of the wedging slider 7. The wedging sliding block 7 is lifted under the action of the wedging block 8, and the guide pin 16 is fixed, so that the wedging block 8 cannot be transversely deviated in the lifting process. When the wedge block 8 is lifted, the spring 15 is in a compressed state, one end of the spring 15 abuts against the wedge sliding block 7, the other end of the spring 15 abuts against the rear template 3, and when the wedge block 8 releases the lifting of the wedge sliding block 7, the wedge sliding block 7 falls back under the elastic force of the spring 15, so that the screw thread rod 1 can be screwed out of an injection product.

Example 5

With reference to fig. 1-5, in the spiral demolding structure of this embodiment, compared with any one of the technical solutions of embodiments 1-4, a wear-resistant block 9 is disposed at a position where the first driving surface and the second driving surface abut, and a wear-resistant cover plate 10 is disposed on a sliding plane of the wedge block 8. The wedging block 8 slides under the driving of the first driving piece 12, when the wedging block 8 is in contact with the wedging sliding block 7, the first driving surface and the second driving surface can be rubbed, the first driving surface and the second driving surface can be damaged for a long time, and the wear-resisting block 9 can prevent the first driving surface and the second driving surface from being damaged due to antifriction. The wear-resistant cover plate 10 has an anti-friction effect and prevents the wedge block 8 from being damaged by sliding contact with other parts, so that the wear-resistant cover plate 10 is arranged below the sliding plane of the wedge block 8, and the wedge block 8 slides and rubs on the wear-resistant cover plate 10.

Example 6

With reference to fig. 1 to 5, compared with any one of the technical solutions of embodiments 1 to 5, the spiral demolding structure of this embodiment is configured with an air cylinder, an oil cylinder, or an electric cylinder. An oil cylinder, an air cylinder or an electric cylinder can be arranged at the bottom of the wedge tight sliding block 7, and the wedge tight sliding block 7 is directly lifted by the oil cylinder for a certain height, so that the wedge tight sliding block 7 wedges the thread rod 1.

Example 7

With reference to fig. 1 to 5, in the spiral demolding structure of this embodiment, compared with any one of the technical solutions of embodiments 1 to 6, one end of the insert 17 is fixed on the front mold plate 21, the other end of the insert 17 is attached to the top of the screw rod 1, and the insert 17 is provided with a through exhaust hole 18. The other end of the insert 17 is provided with a first bulge, the top of the thread rod 1 is provided with a first groove 71 matched with the first bulge, and the surface of the first bulge is a touch-through surface. During injection molding, the first groove 71 of the screw rod 1 is tightly attached to the first protrusion of the insert 17. And in the process of fitting the first bulge surface of the insert 17 with the first groove 71 surface of the screw rod 1, gas is exhausted from the exhaust hole 18, so that the insert 17 is tightly matched with the screw rod 1, and the exhaust hole 18 can supplement gas when the insert 17 is separated from the screw rod 1, so that the gas pressure of the fitting surface of the first bulge and the first groove 71 is not too small to separate.

Example 8

With reference to fig. 1-5, compared with any one of the technical solutions of embodiments 1-7, the screw thread matching between the screw thread rod 1 and the screw thread sleeve 2 is shorter than the screw thread inside the screw thread sleeve 2, and the top of the screw thread rod 1 is provided with a screw thread and extends into a product forming area. The thread at the top of the threaded shank 1 is used to create product requirements. The screw thread in the thread insert 2 equals with the screw thread pitch at 1 top of thread pole, and thread pole 1 is at 2 internal rotation rounds of thread insert like this, and thread pole 1 also can rotate the round in the product, and synchronous revolution prevents to cause the injury to the product. When finishing moulding plastics, power unit 4 drives thread pole 1 at thread sleeve 2 internal rotations through drive mechanism, and thread pole 1 is rotated out from the product and needs to rotate certain distance, so the screw thread that thread pole 1 and thread sleeve 2 match is shorter than the screw thread in thread sleeve 2, makes thread pole 1 can be in 2 internal rotations of thread sleeve a section distance, and until thread pole 1 is completely rotated out from the product.

Example 9

With reference to fig. 1 to 5, in the spiral demolding structure of this embodiment, compared with any one of the technical solutions of embodiments 1 to 8, the wedging block 8 is connected to the first driving element 12 through the driving medium 11, and the first driving element 12 is fixed on the rear mold base plate 14 through the driving fixing block 13. The driving meson 11 is a T-shaped block, and the wedging block 8 is provided with a T-shaped groove 81 matched with the driving meson 11. One end of the driving medium 11 is fixedly connected with the first driving member 12, and the other end of the driving medium 11 is disposed in the T-shaped groove 81. One end of the driving fixing block 13 is fixedly connected with the rear die seat plate 14 through a screw, and the other end of the driving fixing block 13 is fixedly connected with the first driving piece 12 through a screw to fix the first driving piece 12.

Example 10

With reference to fig. 1 to 5, in the spiral demolding structure of this embodiment, compared with any one of the technical solutions of embodiments 1 to 9, the power mechanism 4 is a motor, the transmission mechanism includes a first gear 6, a chain 5, and a second gear 20, and the motor drives the threaded rod 1 to rotate through the first gear 6, the chain 5, and the second gear 20. The second gear 20 is fixedly arranged on the thread rod 1, the motor drives the first gear 6 to rotate through the chain 5, and the first gear 6 drives the second gear 20 to rotate so as to drive the thread rod 1 to rotate, so that the thread rod 1 can move up and down in the thread sleeve 2.

Example 11

The present embodiment provides a spiral demolding structure, which includes,

A. constructing a spiral demolding structure described in the above embodiment;

B. before injection molding, the power mechanism 4 is started, the power mechanism 4 drives the first gear 6 to rotate through the chain 5, the first gear 6 is meshed with the second gear 20 to drive the thread rod 1 to rotate and advance in the thread sleeve 2 until the top of the thread rod 1 is in collision with the penetrating surface and is tightly attached to the insert 17 without a gap, and then the power mechanism 4 is closed.

C. Then, the first driving piece 12 is opened, the first driving piece 12 drives the wedging block 8 to slide, the anti-falling part 82 of the wedging block 8 slides into the first groove 71 of the wedging sliding block 7, the second driving surface of the wedging block 8 is gradually attached to the first driving surface of the wedging sliding block 7, the attaching area is gradually increased, the wedging block 8 gradually drives the wedging sliding block 7 to be lifted, the spring 15 is compressed until the wedging sliding block 7 is contacted with the bottom of the thread rod 1, and the thread rod 1 is wedged tightly.

D. After the injection molding is finished, the first driving piece 12 drives the wedging block 8 to enable the wedging sliding block 7 to fall back. The spring 15 is released by the compressed potential energy to further push the wedging slide 7 to fall back. Then the power mechanism 4 is started, the power mechanism 4 drives the thread rod 1 to rotate in the thread sleeve 2 through the transmission mechanism until the thread rod 1 is screwed out of the product.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. The utility model provides a spiral demolding structure, includes thread pole, thread cover, mold insert, back template, power unit, drive mechanism, carves tight slider and lifting mechanism, its characterized in that, the thread cover is fixed on the back template, the thread pole can be at thread cover internal rotation, power unit drives the rotation of thread pole through drive mechanism, thread pole bottom is equipped with carves tight slider, the tight slider of wedge of tight slider can be lifted to the lifting mechanism, thread pole top is equipped with the mold insert of looks block.

2. A screw stripping structure as claimed in claim 1, wherein the lifting mechanism comprises a first drive member and a wedge block secured to an output shaft of the first drive member.

3. The spiral demolding structure as claimed in claim 2, wherein the wedging sliding block is provided with a first driving surface, the wedging block is provided with a second driving surface abutting against the first driving surface, the wedging block is matched with the first driving surface and the second driving surface to drive the wedging sliding block to move up and down, and the wedging sliding block and the wedging block are provided with anti-falling structures.

4. A spiral stripping structure as claimed in claim 3, wherein the wedging slide block is provided with a guide hole, the guide hole is penetrated with a guide pin, one end of the guide pin is fixed on the rear template, and one end of the guide pin close to the rear template is penetrated with a spring.

5. A spiral stripping structure as claimed in claim 4, wherein the first and second driving surfaces are provided with wear-resistant blocks at their junctions, and the sliding plane of the wedge block is provided with a wear-resistant cover plate.

6. A screw stripping structure as claimed in claim 1 or claim 2, wherein the lifting mechanism is an air cylinder, oil cylinder or electric cylinder.

7. The spiral demolding structure of claim 1, wherein one end of the insert is fixed on the front mold plate, the other end of the insert is attached to the top of the threaded rod, and a through exhaust hole is formed in the insert.

8. A screw ejection structure according to claim 1 or 7, wherein the screw thread is provided in the thread sleeve on the surface of the screw shank, the screw shank is provided with a matching thread on the thread sleeve, the matching thread of the screw shank and the thread sleeve is shorter than the thread in the thread sleeve, and the screw shank is provided with a thread on the top and extends into the product forming region.

9. The spiral stripping structure as claimed in claim 2, wherein the wedging block is connected to a first driving member via a driving spacer, and the first driving member is fixed to the rear mold base plate via a driving fixing block.

10. A screw ejection structure according to claim 1, wherein the power mechanism is a motor, the transmission mechanism includes a first gear, a chain and a second gear, and the motor drives the screw rod to rotate through the first gear, the chain and the second gear.