CN210758924U

CN210758924U - Rotary demolding mold

Info

Publication number: CN210758924U
Application number: CN201921597549.8U
Authority: CN
Inventors: 梁振民
Original assignee: Dongguan Shen An Plastic Mold Co ltd
Current assignee: Dongguan Shen An Plastic Mold Co ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-06-16
Anticipated expiration: 2029-09-23

Abstract

The utility model relates to a rotate drawing of patterns mould relates to injection mold's technical field, and it includes cover half and movable mould, the movable mould include the movable mould bedplate with set up in the demoulding mechanism of movable mould bedplate. When the fixed die and the movable die are closed, the end part of the rotation stopping core extends into the cavity, and the rotation stopping block is arranged to enable a rotation stopping hole to be formed in the plastic part so as to limit the relative rotation between the plastic part and the rotation stopping core; when the fixed die and the movable die are separated, the plastic part moves along with the movable die to be separated from the die cavity, and the detaching assembly drives the thread core to rotate so that the thread core and the plastic part can rotate relatively, so that the demolding between the plastic part and the thread core is completed. The utility model has the advantages of compact structure and stability.

Description

Rotary demolding mold

Technical Field

The utility model belongs to the technical field of injection mold's technique and specifically relates to a rotate drawing of patterns mould is related to.

Background

Various tools and products used in daily production and life are as large as a base and a machine body shell of a machine tool and as small as a shell of a screw, a button and various household appliances, and have no close relation with a die. The shape of the mold determines the shape of the products, and the processing quality and precision of the mold determine the quality of the products.

The molds at the present stage are mainly classified into hardware molds, plastic molds, and special molds thereof according to the difference of the molded materials. Among them, a plastic mold, that is, a common injection mold, is a short name for a combined mold used for compression molding, extrusion molding, injection, blow molding and low-foaming molding. The coordination change of the male die, the female die and the auxiliary forming system of the die can process a series of plastic parts with different shapes and sizes.

The injection mold mainly comprises a fixed mold and a movable mold. The fixed mold part is arranged on a fixed workbench of an injection machine and is kept still all the time in the injection molding process. The movable mould part is arranged on a movable workbench of the injection machine and can move through a mould closing system of the injection machine in the injection molding process. When the injection molding is started, the mold closing system drives the movable mold to move towards the direction close to the fixed mold. And the fixed mold is matched with the parting surface. After closing, a cavity and a pouring system which are consistent with the shape and the size of a product are formed between the movable mold and the fixed mold, the injection machine injects plastic melt into the cavity through the pouring system so that the cavity is filled with the plastic melt, and after pressure maintaining, feeding and cooling shaping, the mold closing system drives the movable mold to move towards the direction far away from the fixed mold, so that the movable mold and the fixed mold are opened from a parting surface, and a plastic part moves along with the movable mold. When the movable mould retreats to a certain position, the demoulding mechanism inside the movable mould pushes the plastic part to be separated from the novel mould, and therefore the finished plastic part is obtained.

However, many prior art plastic articles have helical lateral grooves and grooves, which require rotational demolding when using one-piece swages or cores, i.e., the plastic part and the molded part are rotated relative to each other during demolding. But the lead angle of the thread is small, and the thread has the characteristic of axial self-locking, so that the demoulding is carried out by a special rotating mechanism.

The existing rotating mechanism for detaching the threads by using external power mainly comprises motor detachment and hydraulic cylinder detachment. Wherein, the selection of size can be carried out according to actual stroke needs to the pneumatic cylinder. However, along with the increase of the stroke, the volume of the hydraulic cylinder is increased, so that the die has the defects of large appearance and complex structure, and the die is only provided with the large hydraulic cylinder and is easy to cause instable installation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rotation drawing of patterns mould has compact structure and stable advantage.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a rotary stripper die, comprising:

the fixed die comprises a fixed die base plate and a concave die plate fixedly arranged on the fixed die base plate, and a cavity is formed in the concave die plate;

the moving die comprises a moving die base plate and a demoulding mechanism arranged on the moving die base plate, the demoulding mechanism comprises a first moving die plate, a second moving die plate and a third moving die plate which are sequentially arranged along the direction far away from the fixed die, the first moving die plate, the second moving die plate, the third moving die plate and the moving die base plate are relatively fixed,

the first movable mold plate is in threaded connection with a threaded core, the threaded core is sequentially provided with a first threaded section, a second threaded section and a gear section along the direction far away from the fixed mold, the first threaded section is used for forming plastic part threads, and the second threaded section is in threaded connection with the second movable mold plate;

the second movable mould plate is provided with a detaching assembly for driving the threaded core to rotate, the detaching assembly comprises a first gear meshed with the threaded core gear section, a second gear coaxially and fixedly arranged on the first gear, a rack meshed with the second gear and a driving piece for driving the rack to move, the diameter of the reference circle of the first gear is larger than that of the reference circle of the second gear,

and a rotation stopping core is fixedly arranged on the third movable template, the end part of the rotation stopping core penetrates out of the threaded core to extend into the cavity, and a rotation stopping block is fixedly arranged at the end part of the rotation stopping core.

By adopting the technical scheme, when the fixed die and the movable die are assembled, the end part of the rotation stopping core extends into the cavity, and the rotation stopping block is arranged to enable the rotation stopping hole to be formed in the plastic part so as to limit the relative rotation between the plastic part and the rotation stopping core;

when the fixed die is separated from the movable die, the plastic part moves along with the movable die to be separated from the cavity, and the detaching assembly drives the threaded core to rotate so that the threaded core and the plastic part can rotate relatively, so that the demolding between the plastic part and the threaded core is completed;

the reference circle diameter of the first gear is larger than that of the second gear, so that the linear velocity of the first gear is larger than that of the second gear, the transmission ratio between the rack and the second thread section of the thread core is controlled by controlling the ratio of the reference circle diameters between the first gear and the second gear, and the rack with the same length can obtain more revolutions of the thread core, so that the mold structure is more compact to avoid the problem of larger appearance;

the dismounting component is independently arranged on the second movable template, the threaded core is arranged on the first movable template, and the rotation stopping core is arranged on the third movable template, so that the demoulding mechanism has enough installation position on the second movable template, the installation stability of the demoulding mechanism is improved under the condition of ensuring compact structure, and the stability of the mould structure is improved.

The utility model discloses further set up to: the second movable mould plate is provided with a slide hole for the threaded core to pass through and a rotary groove for the first gear to be installed, the rotary groove is communicated with the slide hole, a rotary shaft which is coaxially and fixedly connected with the first gear is arranged in the rotary groove, the second gear is coaxially and fixedly connected with the rotary shaft, a first shaft hole for the rotary shaft to be rotatably connected with one end of the rotary shaft is formed in the rotary groove, and a second shaft hole for the rotary shaft to be embedded into is formed in the third movable mould plate.

Through adopting above-mentioned technical scheme, the cooperation of primary shaft hole and secondary shaft hole is so that the pivot can be in the stable rotation of rotary tank to guarantee the operation that first gear can normally be stable, improved the operating stability just enough of drawing of patterns, from this, improved the stable in structure of this mould when guaranteeing this mould compact structure.

The utility model discloses further set up to: the first shaft hole is internally provided with a first bearing, the inner ring of the first bearing is sleeved on the outer circular surface of the rotating shaft, the second shaft hole is internally provided with a second bearing, and the inner ring of the second bearing is sleeved on the outer circular surface of the rotating shaft.

Through adopting above-mentioned technical scheme, the setting of first bearing and second bearing has reduced the frictional force between pivot and first shaft hole and the second shaft hole to demoulding mechanism's operating stability has been improved.

The utility model discloses further set up to: the threaded core is further provided with a limiting circular shaft section, the limiting circular shaft section is located on one side, close to the third movable template, of the gear section, the diameter of the limiting circular shaft section on the threaded core is smaller than that of the gear section on the threaded core, a limiting shaft sleeve for the limiting circular shaft section to penetrate through is fixedly arranged on one side, facing the third movable template, of the sliding hole, and the inner diameter of the limiting shaft sleeve is smaller than that of the gear section on the threaded core.

Through adopting above-mentioned technical scheme, spacing axle sleeve conflicts with the gear section with the sliding distance of restriction thread core, avoids thread core sliding distance too big and with the third movable mould board between take place the striking, guarantees the stability of this mould at the drawing of patterns in-process from this.

The utility model discloses further set up to: and a through groove for the rack to pass through is formed in the second movable template, the extending direction of the through groove is vertical to the extending direction of the sliding hole, and the through groove is positioned between the sliding hole and the rotating groove.

Through adopting above-mentioned technical scheme, the reference circle diameter of second gear is greater than the reference circle diameter of first gear to leave great space before making second gear and slide opening, lead to the groove and lie in between slide opening and the rotary trough and pass in order to supply the rack to slide, thereby make the structure of this mould compacter.

The utility model discloses further set up to: the moving distance of the thread core on the second movable mould plate is less than the length of the first thread section on the thread core.

Through adopting above-mentioned technical scheme, when spacing axle sleeve contradicts with the gear section, the rack continues to order about threaded core and rotates so that break away from between first movable mould board and the second movable mould board to order about to mould and break away from between the core with stopping rotating, thereby accomplish the drawing of patterns of moulding the piece.

The utility model discloses further set up to: the fixed bracket that is provided with on the outer wall of second movable mould board, the bracket include with second movable mould board fixed connection's first frame plate, with driving piece fixed connection's second frame plate and be located first frame plate with support body between the second frame plate, the one end of support body with first frame plate fixed connection and the other end with fixed connection between the second frame plate, seted up the confession on the support body the gliding guide chute of rack.

Through adopting above-mentioned technical scheme, the driving piece orders about the rack and slides along the guide way with the slip stability who improves the rack to improve the structural stability that this mould gave in drawing of patterns in-process.

The utility model discloses further set up to: the width of the first frame plate is larger than the thickness of the second movable template, one end of the first frame plate is fixedly connected with the second movable template, and the other end of the same end face of the first frame plate is fixedly connected with the third movable template.

Through adopting above-mentioned technical scheme, first frame plate simultaneously with second movable mould board and third movable mould board fixed connection to the connection stability between second movable mould board and the third movable mould board has been improved.

The utility model discloses further set up to: the driving part is a hydraulic cylinder or a pneumatic cylinder, a piston rod is arranged on the driving part, and the end part of the piston rod is fixedly connected with the rack.

Through adopting above-mentioned technical scheme, the setting of pneumatic cylinder and pneumatic cylinder for the rack can stably drive the rotation of second gear, thereby improves the job stabilization nature when this mould drawing of patterns.

To sum up, the utility model discloses a beneficial technological effect does:

1. the reference circle diameter of the first gear is larger than that of the second gear, so that the linear velocity of the first gear is larger than that of the second gear, the transmission ratio between the rack and the second thread section of the thread core is controlled by controlling the ratio of the reference circle diameters between the first gear and the second gear, and the rack with the same length can obtain more revolutions of the thread core, so that the mold structure is more compact to avoid the problem of larger appearance;

2. the dismounting component is independently arranged on the second movable template, the threaded core is arranged on the first movable template, and the rotation stopping core is arranged on the third movable template, so that the demoulding mechanism has enough installation position on the second movable template, the installation stability of the demoulding mechanism is improved under the condition of ensuring compact structure, and the stability of the mould structure is improved;

3. when spacing axle sleeve contradicts with the gear section, the rack continues to order about threaded core and rotates so that break away from between first movable mould board and the second movable mould board to order about to mould and break away from between the core with stopping rotating, thereby accomplish the drawing of patterns of moulding the piece.

Drawings

Fig. 1 is a schematic diagram of the overall explosion structure of the present invention;

fig. 2 is a schematic view of the installation explosion structure of the present invention;

fig. 3 is a schematic sectional structure of the present invention;

FIG. 4 is an enlarged partial schematic view of portion A of FIG. 3;

FIG. 5 is a schematic view of the mounting structure of the second movable platen;

fig. 6 is a schematic view of the mounting structure of the ejector mechanism;

FIG. 7 is a schematic view of the overall construction of the threaded core;

FIG. 8 is a cross-sectional structural schematic of a threaded core;

FIG. 9 is a schematic view of the entire structure of the rotation stopping core;

fig. 10 is a front view structural schematic diagram of the rotation stopping core.

In the figure, 1, a fixed die; 11. a fixed die base plate; 12. a cavity plate; 13. a cavity; 2. moving the mold; 21. a movable mould seat plate; 22. a demolding mechanism; 221. a first movable template; 222. a second movable template; 2221. a slide hole; 2222. rotating the groove; 2223. a first bearing; 2224. a limiting shaft sleeve; 2225. a through groove; 223. a third movable template; 2231. a second bearing; 224. a threaded core; 2241. a first thread segment; 2242. a second thread segment; 2243. a gear segment; 2244. limiting the round shaft section; 2245. perforating; 2246. demoulding inclined planes; 225. detaching the assembly; 2251. a first gear; 2252. a second gear; 2253. a rack; 2254. a rotating shaft; 226. a rotation stopping core; 2261. a rotation stopping block; 2262. a cap body; 2263. a rod body; 2264. a card slot; 227. a bracket; 2271. a first frame plate; 2272. a second frame plate; 2273. a frame body; 2274. a guide chute; 228. a drive member; 2281. a piston rod.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Referring to fig. 1 and 2, for the utility model discloses a rotate drawing of patterns mould, including cover half 1 and movable mould 2. The fixed die 1 is arranged on a fixed workbench of an injection machine and is kept still all the time in the injection molding process. The movable mold 2 is arranged on a movable workbench of the injection molding machine and can move through a mold closing system of the injection molding machine in the injection molding process. When the injection molding is started, the mold closing system drives the movable mold 2 to move towards the direction close to the fixed mold 1.

The fixed die 1 comprises a fixed die base plate 11 and a concave die plate 12 fixedly arranged on the fixed die base plate 11. The fixed mold base plate 11 is provided in a rectangular plate shape. The cavity plate 12 is located on a side of the fixed mold base plate 11 facing away from the fixed work table of the injection machine. The cavity plate 12 is provided with a cavity 13. The die cavity 13 is arranged in an arc-shaped groove according to actual production needs. The cavity 13 is opened toward the movable mold 2. And a pouring system is arranged on the fixed die 1.

Referring to fig. 3 and 4, the movable mold 2 includes a movable mold base plate 21 and a mold-releasing mechanism 22 provided to the movable mold base plate 21. The movable mold base plate 21 is provided in a rectangular plate shape. The demolding mechanism 22 is located on a side of the movable mold base plate 21 away from the moving table of the injection machine. Specifically, the demolding mechanism 22 includes a first movable die plate 221, a second movable die plate 222, a third movable die plate 223, a core assembly, and a stripper assembly 225 that are arranged in this order in a direction away from the fixed die 1.

The first movable die plate 221, the second movable die plate 222, and the third movable die plate 223 are all provided in a rectangular plate shape. The third movable die plate 223 is fixedly arranged on one side of the movable die plate 21 departing from the movable workbench of the injection machine, the second movable die plate 222 is fixedly arranged on one side of the third movable die plate 223 departing from the movable die plate 21, and the first movable die plate 221 is fixedly arranged on one side of the second movable die plate 222 departing from the third movable die plate 223. Preferably, the first movable die plate 221, the second movable die plate 222, the third movable die plate 223 and the movable die plate 21 are connected by bolts.

The middle of the first movable mold plate 221 is perforated with a threaded hole for mounting a core assembly. The axial direction of the screw hole is the same as the moving direction of the movable die 2.

Referring to fig. 5, the second movable platen 222 defines a slide hole 2221 for mounting the core assembly and a rotary slot 2222 for mounting the detachment assembly 225. The axis of the rotation slot 2222 is parallel to the axis of the slide hole 2221. The rotation groove 2222 communicates with the slide hole 2221. The axis of the slide hole 2221 on the second movable die plate 222 coincides with the axis of the screw hole on the first movable die plate 221.

Preferably, the diameter of the threaded hole of the first moving die plate 221 is larger than the diameter of the threaded hole 2221 of the second moving die plate 222.

Referring to fig. 6, the core assembly includes a rotation stop core 226 and a threaded core 224 sleeved on the rotation stop core 226.

Referring to fig. 3, the rotation stopping core 226 is fixedly connected to the third movable die plate 223 and is located on a side of the third movable die plate 223 facing the second movable die plate 222. The threaded core 224 is in threaded connection with the threaded hole of the first moving die plate 221.

Referring to fig. 9 and 10, the rotation stopping core 226 includes a cap 2262 and a rod 2263 fixedly disposed on the cap 2262. The rod 2263 simultaneously passes through the slide hole 2221 of the second moving platen 222 and the threaded hole of the first moving platen 221 so that the cap 2262 extends out of the threaded hole of the first moving platen 221 and toward the fixed mold 1.

Further, the rod 2263 is a cylinder, and the axis of the rod 2263 coincides with the axis of the threaded hole of the first movable template 221. The cap 2262 is arranged like a truncated cone, and the axis of the cap 2262 coincides with the axis of the rod body 2263. The cap body 2262 is located at one end of the rod body 2263 away from the movable mold base plate 21, and the protrusion of the cap body 2262 faces the fixed mold 1. Preferably, the angle between the sidewall of the cap 2262 and the axis of the cap 2262 is 15 ° to 30 °.

Further, the diameter φ 6 of the cap 2262 is larger than the diameter φ 7 of the stem 2263.

Further, a clamping groove 2264 is connected to one end of the rod body 2263, which is far away from the cap body 2262. The latching groove 2264 is provided to limit the rotation of the lever 2263 so that the lever 2263 is stably mounted.

The cap 2262 is fixedly provided with a rotation stopping block 2261 at a side far away from the rod body 2263. Preferably, the number of the rotation stopper 2261 is at least one. When the number of the rotation stoppers 2261 is greater than or equal to two, all the rotation stoppers 2261 are circumferentially and equally spaced on the end surface of the cap body 2262 around the axis of the cap body 2262. The end surface of the rotation stopper 2261 on the side facing the fixed mold 1 is inclined toward the movable mold 2 in a direction away from the axis of the cap 2262.

When the fixed mold 1 and the movable mold 2 are assembled, the cap 2262 of the rotation stopping core 226 extends into the cavity 13, and the rotation stopping block 2261 is arranged to form a rotation stopping hole in the plastic part so as to limit the relative rotation between the plastic part and the rotation stopping core 226.

Referring to fig. 6, the axis of the threaded core 224 coincides with the axis of the threaded hole of the first moving die plate 221.

Referring to fig. 7 and 8, the screw core 224 is cylindrically and tubularly disposed such that the screw core 224 has a penetration hole 2245 along its axial direction through which the rod body 2263 passes. The axis of the perforation 2245 coincides with the axis of the stem 2263. The rod 2263 is slidably connected with the through hole 2245 and can rotate relatively. The cap 2262 is located at a side of the perforation 2245 facing the fixed mold 1. The opening of the perforation 2245 toward the side of the fixed mold 1 has a round corner.

Further, the total length L1 of threaded core 224 is greater than the length L2 of stem 2263 to allow sufficient travel distance of threaded core 224 on stem 2263. The diameter φ 5 of the perforations 2245 is smaller than the diameter φ 6 of the cap 2262 so that the cap 2262 cannot pass through the perforations 2245. Preferably, there is a clearance fit between the bore 2245 and the stem 2263.

The outer circular surface of the threaded core 224 is sequentially provided with a first thread section 2241, a second thread section 2242, a gear section 2243 and a limiting circular shaft section 2244 along the direction far away from the fixed die 1. The first thread section 2241 is located at one end, facing the fixed mold 1, of the thread core 224, the second thread section 2242 is located on one side, away from the cap 2262, of the first thread section 2241, the gear section 2243 is located on one side, away from the gear section 2243, of the second thread section 2242, the gear section 2243 is located on one side, away from the first thread section 2241, of the second thread section 2242, and the limiting circular shaft section 2244 is located on one side, away from the second thread section 2242, of the gear section 2243.

Further, when the fixed mold 1 and the movable mold 2 are clamped, the first screw sections 2241 extend into the cavity 13 of the fixed mold 1 to form the plastic part screw threads. Preferably, the first thread segments 2241 are saw-tooth threads, i.e., the profile of the teeth is not isosceles trapezoid. The flank angle of the working surface of the first screw section 2241 is 5-10 degrees, and the flank angle of the non-working surface of the first screw section 2241 is 40-50 degrees. The roots of the sawtooth threads have larger fillets to reduce stress concentration, and the sawtooth threads have the characteristics of high transmission efficiency of the rectangular threads and high root strength of the trapezoidal thread profile threads.

It should be noted that the outer circumferential surface of threaded core 224 is provided with a mold release slope 2246, where mold release slope 2246 is located on a side of first thread segment 2241 facing cap 2262, so that the side of threaded core 224 located on first thread segment 2241 facing cap 2262 is truncated cone-shaped, mold release slope 2246 is inclined outward along a direction away from first thread segment 2241, and an inclined angle α between mold release slope 2246 and the axis of threaded core 224 is 0 ° to 1 °, preferably, when a plastic part with an inclined angle α of 0.5 ° is demolded, mold release slope 2246 facilitates separation between the plastic part and threaded core 224.

Further, the second threaded section 2242 is in threaded connection with the threaded hole of the second movable die plate 222. The second threaded section 2242 is in clearance fit with the threaded hole of the second movable die plate 222. The diameter φ 2 of the second thread segments 2242 is larger than the diameter φ 1 of the first thread segments 2241. The diameter phi 1 of the first thread section 2241 is smaller than the diameter phi 2 of the second thread section 2242, and the end face, facing one side of the first thread section 2241, of the second thread section 2242 closes the cavity 13 on the fixed mold 1, so that the molding of the plastic part is facilitated.

Preferably, the second thread segments 2242 are trapezoidal threads, i.e. the profile of the second thread segments 2242 is isosceles trapezium. The thread angle of the second thread section 2242 is 15-25 degrees. The acme threads have the advantages of better process, high root strength, and good centering properties, thereby increasing root crush strength of the second thread segments 2242 and increasing rotational stability of the threaded core 224.

Further, gear segment 2243 is driven in rotation by the engagement of stripper assembly 225 to rotate threaded core 224. The diameter φ 3 of gear segment 2243 is less than the diameter φ 2 of second thread segment 2242. The diameter φ 3 of gear segment 2243 is smaller than the diameter φ 1 of first thread segment 2241. Preferably, gear section 2243 has 50-70 teeth and a module of 2. Diameter phi 3 of gear segment 2243 is smaller than diameter phi 2 of second thread segment 2242, and when gear segment 2243 is driven to rotate by external force, threaded core 224 moves in a direction away from cap 2262 until the end surface of second thread segment 2242 facing the side of gear segment 2243 collides with a rotating object driving gear segment 2243, thereby limiting sliding of threaded core 224.

Further, the limit circular shaft segment 2244 is used to cooperate with the movable die 2 to limit the moving distance of the screw core 224. The diameter φ 4 of the limiting circular shaft segment 2244 is smaller than the diameter φ 3 of the gear segment 2243. When gear segment 2243 is driven to rotate by an external force, threaded core 224 moves in a direction away from cap 2262 until the end surface of gear segment 2243 facing one side of limiting circular shaft segment 2244 collides with a corresponding structure on movable die 2, so that the sliding of threaded core 224 is limited.

It should be mentioned that a limiting sleeve 2224 for the limiting circular shaft segment 2244 to pass through is fixedly arranged at an opening of the sliding hole 2221 facing to one side of the third movable mold plate 223, and an inner diameter of the limiting sleeve 2224 is smaller than the diameter phi 3 of the gear segment 2243 on the threaded core 224. The stop boss 2224 abuts against the gear segment 2243 to limit the sliding distance of the threaded core 224, so that the distance that the threaded core 224 moves on the second moving platen 222 is less than the length of the first threaded segment 2241 on the threaded core 224. Thus, the threaded core 224 is prevented from sliding a too large distance to collide with the third moving die plate 223, thereby ensuring stability of the mold during demolding.

When the restraining sleeve 2224 abuts against the gear segment 2243, the rack 2253 continues to drive the threaded core 224 to rotate to disengage the first movable mold plate 221 from the second movable mold plate 222, thereby driving the plastic part to disengage from the rotation stopping core 226, thereby completing the demolding of the plastic part.

Referring to fig. 5 and 6, the threaded core 224 is rotated by the stripper assembly 225. Specifically, the detachment assembly 225 includes a first gear 2251 engaged with the gear segment 2243 of the threaded core 224, a second gear 2252 coaxially fixedly disposed on the first gear 2251, a rack 2253 engaged with the second gear 2252, and a driving member 228 driving the rack 2253 to move.

The pitch diameter of the first gear 2251 is larger than the pitch diameter of the second gear 2252 so that the linear velocity of the first gear 2251 is larger than the linear velocity of the second gear 2252. Controlling the ratio between the gear racks 2253 and the second thread segments 2242 of the threading core 224 by controlling the ratio of the pitch circle diameters between the first 2251 and the second 2252 gear enables a larger number of turns of the threading core 224 to be obtained for the same length of the gear racks 2253, thereby making the mould structure more compact to avoid problems with larger profiles.

Further, a rotating shaft 2254 coaxially and fixedly connected to the first gear 2251 is rotatably disposed in the rotating slot 2222, and the second gear 2252 is coaxially and fixedly connected to the rotating shaft 2254. The axis of the shaft 2254 coincides with the axis of the slot 2222.

Further, a first shaft hole is formed in the rotating slot 2222 for rotatably connecting one end of the rotating shaft 2254. A first bearing 2223 is mounted in the first shaft hole. Preferably, the first bearing 2223 is a ball bearing. The outer race of the first bearing 2223 is an interference fit with the inner wall of the first shaft bore. The inner ring of the first bearing 2223 is fitted around the outer circumferential surface of the rotating shaft 2254 and is in interference fit with the outer circumferential surface of the rotating shaft 2254. The provision of the first bearing 2223 reduces the frictional force between the rotating shaft 2254 and the first and second shaft holes.

The third movable mold plate 223 is formed with a second shaft hole for inserting the other end of the rotating shaft 2254 for rotation. A second bearing 2231 is mounted in the second shaft bore. Preferably, the second bearing 2231 is a ball bearing. The outer race of the second bearing 2231 is an interference fit with the inner wall of the second shaft bore. The inner ring of the second bearing 2231 is fitted around the outer circumferential surface of the rotating shaft 2254 and is in interference fit with the outer circumferential surface of the rotating shaft 2254. The provision of the first bearing 2223 and the second bearing 2231 reduces the frictional force between the rotating shaft 2254 and the first and second shaft holes.

Further, a through slot 2225 for the rack 2253 to pass through is formed in the second movable mold plate 222, an extending direction of the through slot 2225 is perpendicular to an extending direction of the sliding hole 2221, and the through slot 2225 is located between the sliding hole 2221 and the rotating slot 2222. The second gear 2252 has a larger reference circle diameter than the first gear 2251 so that a larger space is left between the second gear 2252 and the slide hole 2221, and the through slot 2225 is located between the slide hole 2221 and the rotating slot 2222 for the rack 2253 to slide through, thereby making the mold more compact.

Further, a bracket 227 is fixedly arranged on an outer wall surface of the second movable die plate 222, the bracket 227 comprises a first frame plate 2271 fixedly connected with the second movable die plate 222, a second frame plate 2272 fixedly connected with the driving member 228, and a frame body 2273 positioned between the first frame plate 2271 and the second frame plate 2272, one end of the frame body 2273 is fixedly connected with the first frame plate 2271, the other end of the frame body 2273 is fixedly connected with the second frame plate 2272, and a slide guide slot 2274 for the rack 2253 to slide is formed in the frame body 2273.

It should be noted that, referring to fig. 2, the width of the first frame plate 2271 is greater than the thickness of the second movable mold plate 222, one end of the first frame plate 2271 is fixedly connected to the second movable mold plate 222, and the other end of the first frame plate 2271, which is on the same end face, is fixedly connected to the third movable mold plate 223. The first frame plate 2271 is fixedly connected to the second movable die plate 222 and the third movable die plate 223, so that the connection stability between the second movable die plate 222 and the third movable die plate 223 is improved.

Preferably, the driving member 228 is a hydraulic or pneumatic cylinder, and the driving member 228 has a piston rod 2281 thereon, and the end of the piston rod 2281 is fixedly connected to the rack 2253. The setting of pneumatic cylinder for rack 2253 can stably drive second gear 2252 and rotate, thereby improves the job stabilization nature when this mould drawing of patterns.

It is worth mentioning that the detaching module 225 is separately installed on the second movable die plate 222, the screw core 224 is installed on the first movable die plate 221, and the rotation stopping core 226 is installed on the third movable die plate 223, thereby allowing the demolding mechanism 22 to have a sufficient installation position on the second movable die plate 222, improving the installation stability of the demolding mechanism 22 while ensuring the compact structure, and thus improving the stability of the mold structure.

The implementation principle of the embodiment is as follows: when the fixed die 1 and the movable die 2 are matched, the cap body 2262 of the rotation stopping core 226 and the first thread section 2241 of the thread core 224 simultaneously extend into the cavity 13 of the fixed die 1, the first thread section 2241 is used for forming threads of a plastic part, the rotation stopping block 2261 on the cap body 2262 is used for forming a rotation stopping hole in the plastic part, and the rotation stopping block 2261 is connected with the rotation stopping hole on the plastic part in a clamping mode so as to limit the relative rotation between the plastic part and the rotation stopping core 226;

after the plastic part is molded, the fixed die 1 and the movable die 2 are separated to drive the plastic part to move along with the movable die 2 to separate from the cavity 13, then the piston rod 2281 of the driving part 228 drives the rack 2253 to slide in the through hole 2245 to drive the second gear 2252 to rotate, so as to drive the first gear 2251 to rotate, and the gear segment 2243 on the threaded core 224 is meshed with the first gear 2251 to rotate along with the first gear 2251, so that the relative rotation between the threaded core 224 and the plastic part can be realized, and the separation between the threaded core 224 and the plastic part is realized;

after the threaded core 224 is completely separated from the plastic part, the limiting boss 2224 abuts against one side of the gear segment 2243 facing the limiting circular shaft segment 2244, then the rack 2253 continues to drive the threaded core 224 to rotate to separate the first movable mold plate 221 from the second movable mold plate 222, so that the threaded core 224 moves reversely relative to the rotation-stopping core 226 to cause the threaded core 224 to abut against the plastic part, and then the continuously moving threaded core 224 enables the end of the threaded core 224 to push the plastic part to separate from the rotation-stopping core 226, thereby completing the demolding of the plastic part.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A rotary stripper die, comprising:

the fixed die (1) comprises a fixed die base plate (11) and a concave die plate (12) fixedly arranged on the fixed die base plate (11), and a cavity (13) is formed in the concave die plate (12);

the moving die (2), the moving die (2) include the moving die bedplate (21) and set up in demoulding mechanism (22) of moving die bedplate (21), demoulding mechanism (22) include along keeping away from first movable mould board (221), second movable mould board (222) and third movable mould board (223) that fixed mould (1) direction set gradually, first movable mould board (221), second movable mould board (222), third movable mould board (223) and relatively fixed between the moving die bedplate (21),

a threaded core (224) is connected to the first movable mold plate (221) in a threaded mode, a first threaded section (2241), a second threaded section (2242) and a gear section (2243) are sequentially arranged on the threaded core (224) along the direction far away from the fixed mold (1), the first threaded section (2241) is used for forming plastic part threads, and the second threaded section (2242) is in threaded connection with the second movable mold plate (222);

a detaching assembly (225) for driving the threaded core (224) to rotate is arranged on the second movable die plate (222), the detaching assembly (225) comprises a first gear (2251) meshed with the gear section (2243) of the threaded core (224), a second gear (2252) coaxially and fixedly arranged on the first gear (2251), a rack (2253) meshed with the second gear (2252) and a driving piece (228) for driving the rack (2253) to move, the reference circle diameter of the first gear (2251) is larger than that of the second gear (2252),

a rotation stopping core (226) is fixedly arranged on the third movable mould plate (223), the end part of the rotation stopping core (226) penetrates out of the threaded core (224) to extend into the mould cavity (13), and a rotation stopping block (2261) is fixedly arranged at the end part of the rotation stopping core (226).

2. The mold for rotary demolding according to claim 1, wherein the second movable mold plate (222) is provided with a sliding hole (2221) for the threaded core (224) to pass through and a rotating groove (2222) for the first gear (2251) to be installed, the rotating groove (2222) is communicated with the sliding hole (2221), a rotating shaft (2254) coaxially and fixedly connected with the first gear (2251) is rotatably arranged in the rotating groove (2222), the second gear (2252) is coaxially and fixedly connected with the rotating shaft (2254), a first shaft hole for rotatably connecting one end of the rotating shaft (2254) is formed in the rotating groove (2222), and a second shaft hole for the other end of the rotating shaft (2254) to be inserted into for rotation is formed in the third movable mold plate (223).

3. A mold for rotational molding according to claim 2, wherein a first bearing (2223) is installed in the first shaft hole, an inner ring of the first bearing (2223) is fitted to the outer circumferential surface of the rotating shaft (2254), a second bearing (2231) is installed in the second shaft hole, and an inner ring of the second bearing (2231) is fitted to the outer circumferential surface of the rotating shaft (2254).

4. A mold for rotary die-releasing as claimed in claim 2, wherein said threaded core (224) further has a limiting circular shaft section (2244), said limiting circular shaft section (2244) is located at one side of said gear section (2243) close to said third movable die plate (223), the diameter of said limiting circular shaft section (2244) on said threaded core (224) is smaller than the diameter of said gear section (2243) on said threaded core (224), said slide hole (2221) is opened towards one side of said third movable die plate (223) and fixedly provided with a limiting sleeve (2224) for said limiting circular shaft section (2244) to pass through, and the inner diameter of said limiting sleeve (2224) is smaller than the diameter of said gear section (2243) on said threaded core (224).

5. A mold for rotary demolding according to claim 4, wherein the second movable mold plate (222) is provided with a through slot (2225) for the rack (2253) to pass through, the through slot (2225) extends in a direction perpendicular to the direction of the slide hole (2221), and the through slot (2225) is located between the slide hole (2221) and the rotary slot (2222).

6. A rotary stripper die according to claim 4, wherein the distance of travel of the threaded core (224) on the second moving platen (222) is less than the length of the first thread segments (2241) on the threaded core (224).

7. A rotary demolding die as claimed in claim 1, wherein a bracket (227) is fixedly arranged on the outer wall surface of the second movable die plate (222), the bracket (227) comprises a first frame plate (2271) fixedly connected with the second movable die plate (222), a second frame plate (2272) fixedly connected with the driving member (228), and a frame body (2273) located between the first frame plate (2271) and the second frame plate (2272), one end of the frame body (2273) is fixedly connected with the first frame plate (2271) and the other end is fixedly connected with the second frame plate (2272), and a slide guide groove (2274) for the rack (2253) to slide is formed in the frame body (2273).

8. A rotary stripper die according to claim 7, wherein said first shelf (2271) has a width greater than a thickness of said second movable die plate (222), one end of said first shelf (2271) is fixedly connected to said second movable die plate (222), and the other end of said first shelf (2271) having the same end surface is fixedly connected to said third movable die plate (223).

9. A rotary stripper die according to claim 7, wherein the drive member (228) is a hydraulic or pneumatic cylinder, the drive member (228) having a piston rod (2281) thereon, the end of the piston rod (2281) being fixedly connected to the rack (2253).