CN210791861U - Double-cavity injection mold - Google Patents

Abstract

The utility model relates to the technical field of molds, in particular to a double-cavity injection mold, which comprises a fixed mold and a movable mold, wherein the movable mold comprises a movable mold base plate and base plates respectively fixedly arranged on two sides of the movable mold base plate, the bearing plate, public template and be used for with ejecting subassembly of fashioned plastics work piece, it is equipped with two at least cores to correspond on the public template, every core is equal fixed cover and is equipped with first drive gear, the drive gear of first drive gear meshing, the coaxial fixedly connected with second drive gear of drive gear, second drive gear meshing has the rack, the fixed adjust cylinder that is equipped with of bearing plate, adjust cylinder's fixed connecting block that is provided with of piston shaft, the connecting block is rectangular cubic basically, the draw-in groove has been seted up to the lateral wall that the connecting block deviates from the piston shaft, one side of draw-in groove is equipped with the card entry, the one end of rack corresponds fixed be provided. This application has the advantage that the staff of being convenient for changes the rack, is favorable to reducing the cost of moulding plastics production.

Description

Double-cavity injection mold

Technical Field

The utility model relates to the technical field of molds, more specifically say, it relates to a double cavity injection mold.

Background

An injection mold is a tool for producing plastic products; and is also a tool for giving the plastic product complete structure and accurate dimension. Injection molding is a process used to mass produce parts of some complex shapes. Specifically, the plastic melted by heating is injected into a mold cavity from an injection molding machine at high pressure, and a formed product is obtained after cooling and solidification.

Conventionally, in the production of a plastic workpiece with an internal thread by using an injection mold, a rotational mold-releasing mechanism must be provided in the mold. The prior rotary demoulding mechanism, for example, chinese patent with publication number CN205112270U, discloses a plastic product thread stripping device applied to an injection mould, comprising a driving unit and a transmission unit, wherein the driving unit comprises a hydraulic oil cylinder and a transmission rack arranged at the end of the hydraulic oil cylinder, the transmission unit comprises a transmission rod for driving a mould core to be separated from a plastic product and a transmission gear set for driving the transmission rod to rotate, a movable thread insert embedded into the mould is arranged at the end of the transmission rod, the transmission gear set is arranged at the other end of the transmission rod, the transmission gear set comprises a first transmission gear nested in the transmission rod and a meshing gear set for realizing transmission of the transmission rack and the transmission rod, the meshing gear set comprises a second transmission gear integrally connected with the side surface, and the third transmission gear is in meshing transmission with the first transmission gear and the transmission rack.

In the above-mentioned technique, hydraulic cylinder and the direct fixed connection of mode direct fixed connection of welding generally are passed through to the tip of driving rack, though can realize that hydraulic cylinder drive driving rack removes, when the damage appears in driving rack, the staff is difficult to change driving rack, can only change hydraulic cylinder and driving rack together, makes again with new oil pressure cylinder and driving rack, and this kind of way has increased the manufacturing cost of moulding plastics to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of above-mentioned prior art, the utility model aims at providing a double cavity injection mould has the advantage that the staff of being convenient for changes the rack, is favorable to reducing the cost of moulding plastics production.

The above technical purpose of the present invention can be achieved by the following technical solutions: a double-cavity injection mold comprises a fixed mold and a movable mold, wherein the fixed mold is provided with at least two cavities; the movable die comprises a movable die base plate, base plates, a supporting plate, a male die plate and an ejection assembly, wherein the base plates are fixedly arranged on two sides of the movable die base plate respectively, the ejection assembly is used for ejecting a formed plastic workpiece out, two sides of the supporting plate are fixedly arranged on the base plates respectively, the male die plate is fixedly arranged on one side, away from the base plates, of the supporting plate, at least two cores are correspondingly arranged on the male die plate, and a gap for forming the plastic workpiece is formed between each core and the cavity;

each core is fixedly sleeved with a first driving gear, a transmission gear meshed with the first driving gear is coaxially and fixedly connected with a second driving gear, the second driving gear is meshed with a rack, an adjusting cylinder is fixedly arranged on the supporting plate, a connecting block is fixedly arranged on a piston shaft of the adjusting cylinder, the connecting block is basically in a rectangular block shape, a clamping groove is formed in the side wall of the connecting block, which deviates from the piston shaft, a clamping inlet is formed in one side of the clamping groove, and a clamping block which is matched with the clamping groove in a clamping mode is correspondingly and fixedly arranged at one end of the rack.

Through adopting above-mentioned technical scheme, the epaxial connecting block of adjusting cylinder piston cooperates with the fixture block joint on the rack to realize that adjusting cylinder orders about the rack through the connecting block and removes, when the rack needs to be changed, the staff removes the linkage effect between fixture block and the draw-in groove and can make the fixture block break away from the draw-in groove, and the staff can realize changing the rack this moment.

Preferably, the clamping groove comprises a first clamping end and a second clamping end, the first clamping end of the clamping groove is fixedly and convexly provided with a first limiting block towards the direction in the clamping groove, and the clamping block is correspondingly provided with a butting groove butted against the first limiting block; one side of the clamping block is correspondingly provided with a first avoiding groove for the second clamping end of the clamping groove to be clamped in.

Through adopting above-mentioned technical scheme, butt groove and first stopper cooperation setting, the cooperation setting of second card income end and first spacing groove of keeping away realizes fixture block and draw-in groove joint cooperation.

Preferably, a chamfer is arranged at a corner of the first avoiding groove.

Through adopting above-mentioned technical scheme, be provided with like this and do benefit to the corner that reduces first keep away the position groove and the wearing and tearing between the second joint end.

Preferably, the corner of the butt joint groove is provided with an arc transition, and the first limiting block is correspondingly provided with an arc transition.

Through adopting above-mentioned technical scheme, be provided with like this and do benefit to the corner that reduces the butt joint groove and the wearing and tearing between the first stopper, be favorable to prolonging the life of connecting block and fixture block.

Preferably, the first limiting block and the first clamping end of the clamping groove are integrally formed.

Through adopting above-mentioned technical scheme, first stopper and first joint end integrated into one piece are favorable to improving the joint strength of the first joint end of first stopper and draw-in groove.

Preferably, the length between the second clamping end of the clamping groove and the bottom of the clamping groove is smaller than the length between the side wall of the first limiting block, which is far away from the clamping groove, and the bottom of the clamping groove.

Through adopting above-mentioned technical scheme, because the length of second joint end to draw-in groove tank bottom is less to make the length of first aversion groove shorter, be favorable to improving the structural strength of connecting block.

Preferably, the side wall of the support plate is fixedly provided with a mounting seat, the cylinder body of the adjusting cylinder is fixedly arranged on the side wall of the mounting seat, the mounting seat is provided with a first guide groove for the piston shaft of the adjusting cylinder to pass through, one side of the first guide groove is provided with an opening, and the connecting block and the rack can slide along the first guide groove.

Through adopting above-mentioned technical scheme, adjust the cylinder and install in the lateral wall of mount pad to realize adjust cylinder fixed mounting in the bearing plate, the mount pad that is equipped with first guide way plays the guard action to adjust the cylinder's piston shaft.

Preferably, two opposite side walls of the connecting block can abut against two opposite groove walls of the first guide groove.

Through adopting above-mentioned scheme, be provided with like this and do benefit to the stability that improves the connecting block and slide along first guide way.

Preferably, the adjusting cylinder is fixed to the mounting base by a plurality of bolts.

Through adopting above-mentioned scheme, be provided with like this and do benefit to the stability of being connected between improvement adjust cylinder and the mount pad.

To sum up, the utility model discloses following beneficial effect has:

1. the connecting block on the piston shaft of the adjusting cylinder is in clamping fit with the clamping block on the rack, so that the adjusting cylinder drives the rack to move through the connecting block, when the rack needs to be replaced, a worker removes the connecting action between the clamping block and the clamping groove to enable the clamping block to be separated from the clamping groove, and the worker can replace the rack at the moment;

2. the length from the second clamping end to the bottom of the clamping groove is shorter, so that the length of the first avoiding groove is shorter, and the structural strength of the connecting block is improved;

3. when sliding, the two opposite side walls of the connecting block can be abutted against the two opposite groove walls of the first guide groove, so that the sliding stability of the connecting block along the first guide groove is improved.

Drawings

FIG. 1 is a schematic structural view of an injection mold according to an embodiment of the present invention;

FIG. 2 is a partial sectional view of the male form and the support plate of the embodiment of the present invention, with the stationary form omitted;

FIG. 3 is a partial sectional view of the core plate, the supporting plate, the ejecting assembly and the movable mold base plate, with the fixed mold omitted, according to the embodiment of the present invention;

FIG. 4 is a schematic view of a core according to an embodiment of the present invention;

FIG. 5 is a schematic view of a partial structure of a movable mold according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an adjusting cylinder, a mounting seat, a guide seat and a rack in the embodiment of the present invention;

fig. 7 is a schematic view of the assembly relationship between the connecting block and the rack in the embodiment of the present invention.

Reference numerals: 101. a fixed die base plate; 102. a master template; 103. a sprue bush; 2. moving the mold; 21. a movable mould seat plate; 211. avoiding holes; 22. a base plate; 23. a support plate; 231. a second avoiding groove; 24. a male template; 241. caulking grooves; 3. a core; 31. a core bar; 32. forming a thread forming sleeve; 4. a cooling water channel; 51. an accommodating cavity; 52. a threaded sleeve; 61. a first drive gear; 62. a transmission gear; 63. a second drive gear; 64. a rack; 641. a first abutting surface; 642. a second interference surface; 65. a clamping block; 651. a butt joint groove; 652. a first avoiding groove; 66. an adjusting cylinder; 661. connecting blocks; 662. a card slot; 6621. a first clamping end; 6622. a second clamping end; 6623. a first stopper; 71. a first circular lumen; 72. a second circular lumen; 73. a third circular cavity; 8. a mounting seat; 81. a convex edge; 82. a first guide groove; 9. a guide seat; 91. a second guide groove; 911. a second limiting block; 10. an upper fixing plate; 11. a lower fixing plate; 111. a jack rod sleeve; 121. a thimble; 122. a guide bar; 13. pushing the plate; 14. a plastic workpiece.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A kind of injection mould of double cavity, see figure 1, including the stationary mould and moving die 2, the stationary mould includes stationary mould saddle plate 101 and mother template 102, the mother template 102 of the stationary mould offers at least two cavities (not shown in the figure); in this embodiment, the fixed mold is provided with two cavities. A sprue bush 103 is arranged in the middle of a fixed die seat plate 101 of the fixed die, a main runner (not shown in the figure) is communicated with the sprue bush 103, two sub-runners (not shown in the figure) are communicated with the main runner, and the two sub-runners are respectively communicated with the two cavities correspondingly. A plurality of cooling water channels 4 (not shown) are provided in the mother die plate 102. The movable mold 2 comprises a movable mold seat plate 21, a base plate 22, a support plate 23, a male mold plate 24 and an ejection assembly, wherein the base plate 22, the support plate 23 and the male mold plate 24 are fixedly arranged on two sides of the movable mold seat plate 21 respectively, the ejection assembly is used for ejecting the formed plastic workpiece 14, two sides of the support plate 23 are fixedly arranged on the base plate 22 respectively, the male mold plate 24 is fixedly arranged on one side, deviating from the base plate 22, of the support plate 23, two cores 3 (shown in a combined figure 5) are correspondingly arranged on the male mold plate 24, and a gap for. The working principle of realizing the injection molding workpiece 14 between the injection molding machine, the fixed mold and the movable mold 2 is the prior art and is not described herein.

Referring to fig. 2 and 3, the ejection assembly includes an ejector rod (not shown), an ejection cylinder (not shown), an upper fixing plate 10, a lower fixing plate 11, a plurality of ejector pins 121, and a push plate 13. And a piston rod of the ejection oil cylinder is fixedly connected with the ejector rod so as to drive the ejector rod to move. The center position of the movable mold base plate 21 is provided with a clearance hole 211 through which one end of the ejector rod, which is far away from the ejection cylinder, passes, and the ejector rod can be connected to the clearance hole 211 in a sliding manner. The upper fixing plate 10 and the lower fixing plate 11 are located between the movable mold base plate 21 and the support plate 23, the lower fixing plate 11 is located at one side close to the movable mold base plate 21, a ejector rod sleeve 111 is arranged on the side surface of the lower fixing plate 11 facing the movable mold base plate 21, and the ejector rod sleeve 111 can slide relative to the clearance hole 211. One end of the ejector rod, which is far away from the ejection cylinder, is fixedly connected in the ejector rod sleeve 111. The upper fixing plate 10 is fixedly connected with the lower fixing plate 11, and a space for the upper fixing plate 10 and the lower fixing plate 11 to synchronously slide is formed by enclosing the two backing plates 22, the movable mold base plate 21 and the supporting plate 23. The side of the male template 24, which is far away from the support plate 23, is provided with a caulking groove 241, the push plate 13 can be embedded into the caulking groove 241, and the push plate 13 can slide out of the caulking groove 241.

In the present embodiment, four ejector pins 121 are provided. One end of the thimble 121 is fixedly connected to the upper fixing plate 10, and the other end of the thimble 121 passes through the support plate 23 and the embedding groove 241 and is fixedly connected to the push plate 13. One end of the core 3 is arranged on the support plate 23, the other end of the core 3 passes through the caulking groove 241 and penetrates out of the push plate 13, and the push plate 13 can push out the plastic workpiece 14 molded on the core rod 31.

Referring to fig. 2 and 3, at least two guide rods 122 are fixedly disposed on the upper fixing plate 10, and the length direction of the guide rods 122 is the same as the sliding direction of the upper fixing plate 10 and the lower fixing plate 11. In the present embodiment, four guide rods 122 are provided in order to make the movement of the upper fixing plate 10 and the lower fixing plate 11 more stable. One end of each of the four guide rods 122 is fixedly disposed at four corners of the upper fixing plate 10. One end of the guide rod 122, which is far away from the upper fixing plate 10, passes through the support plate 23 and the core plate 24, respectively, and the guide rod 122 can slide relative to the support plate 23 and the core plate 24. The side walls of the guide rods 122 are coated with a wear-resistant layer so that the guide rods 122 are not easily worn.

Referring to fig. 4 and 5, the core 3 includes a core rod 31 in a circular truncated cone shape and a thread forming sleeve 32, one end of the core rod 31 is fixedly disposed on the supporting plate 23, the other end of the core rod 31 penetrates through the core plate 24 and can be inserted into the cavity, the core rod 31 is disposed in a hollow manner, and one end of the core rod 31 which can be inserted into the cavity is disposed in a closed manner. A plurality of cooling water channels 4 are fixedly installed in the support plate 23, wherein two cooling water channels 4 penetrate into the hollow part of the core rod 31 to perform a cooling function on the molded plastic workpiece 14. The thread forming sleeve 32 is sleeved on the core rod 31 and can rotate relative to the core rod 31, one end of the thread forming sleeve 32 penetrates through the male die plate 24 and is provided with an external thread in threaded connection with the internal thread of the plastic workpiece 14, an accommodating cavity 51 is formed in the supporting plate 23, a thread sleeve 52 is fixedly arranged in the accommodating cavity 51, the other end of the thread forming sleeve 32 is provided with an external thread in threaded connection with the internal thread of the thread sleeve 52, and a space for the thread forming sleeve 32 to move in the direction towards or away from the formed plastic workpiece 14 on the core rod 31 is formed in the thread sleeve 52.

As shown in fig. 2 and 3, each thread forming sleeve 32 is fixedly sleeved with a first driving gear 61, and the male mold plate 24 is provided with a first circular cavity 71 for the first driving gear 61 to rotate. The male mold plate 24 is provided with a second circular cavity 72 (see fig. 2), the second circular cavity 72 is communicated with the first circular cavity 71, the second circular cavity 72 is rotatably connected with a transmission gear 62 which is engaged with the first driving gear 61, the transmission gear 62 is coaxially and fixedly connected with a second driving gear 63, the support plate 23 is provided with a third circular cavity 73 for the second driving gear 63 to rotate, and the third circular cavity 73 is communicated with the second circular cavity 72. The second drive gear 63 is engaged with a rack gear 64, the rack gear 64 being located outside the support plate 23. The supporting plate 23 is fixedly provided with an adjusting cylinder 66, the adjusting cylinder 66 can drive a rack 64 to move, the rack 64 drives a second driving gear 63 to rotate, the second driving gear 63 drives a transmission gear 62 to rotate, the transmission gear 62 simultaneously drives two first driving gears 61 to rotate, the first driving gears 61 drive the thread forming sleeve 32 to rotate, at the moment, the thread forming sleeve 32 moves towards the direction in the thread sleeve 52 until the external thread of the thread forming sleeve 32 is separated from the internal thread of the formed plastic workpiece 14, and therefore thread demoulding is achieved. Can realize simultaneously driving two cores 3 through a adjust cylinder 66 cooperation rack 64, second drive gear 63 and drive gear 62 and carry out the screw thread drawing of patterns in this application, compare in the mode that a power supply of exclusive use drives a screw thread shaping cover 32 and realizes the screw thread drawing of patterns, this application adopt a power supply carry on the screw thread drawing of patterns can, be favorable to sparingly the cost of moulding plastics, be favorable to improving the synchronism of two screw thread shaping covers 32 drawing of patterns simultaneously.

Referring to fig. 1 and 6, the side wall of the support plate 23 is fixedly provided with a mounting seat 8. Specifically, a protruding edge 81 is fixedly disposed on one side of the mounting seat 8, and the protruding edge 81 is fixed to the side wall of the support plate 23 by a plurality of bolts. The thickness of the ledge 81 is set to W, which ranges from 18mm to 25mm, and in this embodiment, the thickness W of the ledge 81 is preferably 22mm to ensure the stability of the connection between the mounting seat 8 and the support plate 23. An adjusting cylinder 66 is arranged on the side wall of the mounting seat 8. The cylinder body of the adjusting cylinder 66 is fixed to the mount 8 by a plurality of bolts. The mounting seat 8 is provided with a first guide groove 82 for the piston shaft of the adjusting cylinder 66 to pass through, one side of the first guide groove 82 is provided with an opening, and the rack 64 can be connected with the first guide groove 82 in a sliding manner. The piston shaft of the adjusting cylinder 66 is positioned in the first guide groove 82, and when the movable die 2 is transported, the mounting seat 8 plays a role in protecting the piston shaft, so that the influence on the straightness of the piston shaft caused by collision in the transportation process is avoided. In order to further improve the moving stability of the rack 64, the other side of the support plate 23 is also fixedly provided with a guide seat 9, and the convex edge 81 of the mounting seat 8 is fixedly connected with the guide seat 9 through a bolt. The lateral wall of guide holder 9 is seted up the second guide way 91 with first guide way 82 intercommunication each other, and in the in-process that adjustment cylinder 66 drove rack 64 and removed, rack 64 can move along first guide way 82 and second guide way 91. The side wall of the support plate 23 is opened with a second avoiding groove 231 through which the toothed portion of the rack 64 passes, and the rack 64 can move along the second avoiding groove 231.

Referring to fig. 1 and 2, the second guide groove 91 is substantially L-shaped in cross section in the transverse direction, and a side of the second guide groove 91 adjacent to the support plate 23 is opened such that the second guide groove 91 communicates with the third circular cavity 73. The second guide groove 91 is provided with a second stopper 911 away from the side wall of the support plate 23 in the direction toward the support plate 23, and in this embodiment, the second stopper 911 is integrally formed with the groove wall of the second guide groove 91. The rack 64 is respectively provided with a first collision surface 641 and a second collision surface 642, the first collision surface 641 of the rack 64 collides with the side wall of the second stopper 911, and the second collision surface 642 of the rack 64 collides with the groove wall of the second guide groove 91, so that the rack 64 is more stable in the moving process.

Referring to fig. 6 and 7, in order to increase the stability of the connection between the piston shaft of the adjusting cylinder 66 and the rack 64, a latch 65 snap-fitted into a latch groove 662 is correspondingly and fixedly disposed at one end of the rack 64. The fixed connecting block 661 that is provided with of piston shaft of adjusting cylinder 66, connecting block 661 is rectangular block shape basically, and draw-in groove 662 has been seted up to the lateral wall that connecting block 661 deviates from the piston shaft, and one side of draw-in groove 662 is equipped with the card income mouth that supplies fixture block 65 card to go into. In the present embodiment, the end of the rack 64 is integrally formed with the latch 65, so as to improve the stability of the connection between the latch 65 and the end of the rack 64.

It is worth saying that the slot 662 includes a first engaging end 6621 and a second engaging end 6622, the first engaging end 6621 is provided with a first stopper 6623 protruding toward the direction inside the slot 662, and the stopper 65 is correspondingly provided with an abutting slot 651 for the first stopper 6623 to be embedded into. In this embodiment, the first stopper 6623 and the first fastening end 6621 are integrally formed. In order to reduce the wear between the first limiting block 6623 and the abutting groove 651, the corners of the abutting groove 651 are provided with arc transitions, and similarly, the first limiting block 6623 is correspondingly provided with the arc transitions. A first avoiding groove 652 into which the second clamping end 6622 of the clamping groove 662 is clamped is formed in one side of the clamping block 65, and a chamfer is formed at a corner of the first avoiding groove 652 so as to reduce the wear between the corner of the first avoiding groove 652 and the second clamping end 6622.

Referring to fig. 6, the length from the second stopper 6622 to the bottom of the slot 662 is a1, the length from the side wall of the first stopper 6623 away from the slot 662 to the bottom of the slot 662 is a2, and the length a1 from the second stopper 6622 to the bottom of the slot 662 is smaller than the length a2 from the side wall of the first stopper 6623 away from the slot 662 to the bottom of the slot 662. The length a1 from the second clamping end 6622 to the bottom of the clamping groove 662 is smaller, so that the length of the first avoiding groove 652 is shorter, and the structural strength of the connecting block 661 is improved.

When the adjusting cylinder 66 drives the connecting block 661 to move along the direction of the cylinder body of the adjusting cylinder 66, the connecting block 661 can slidably connect along the first guiding groove 82, and in the sliding process, the side wall of the connecting block 661 where the first engaging end 6621 is located and the side wall of the connecting block 661 where the second engaging end 6622 is located can respectively abut against the two opposite groove walls of the first guiding groove 82. In order to further reduce the abrasion between the connecting block 661 and the first guide groove 82, the corners of the first guide groove 82 are provided with chamfers, and similarly, the connecting block 661 is correspondingly provided with chamfers matched with the chamfers of the first guide groove 82. The adjusting cylinder 66 can drive the connecting block 661 to move in a direction away from the cylinder body of the adjusting cylinder 66, and the side wall of the first limiting block 6623 departing from the slot 662 can abut against the side wall of the second limiting block 911 facing one side of the mounting seat 8.

The specific working process is as follows:

during injection, the lower fixing plate 11 abuts against the movable mold base plate 21. When demolding is required, the adjusting cylinder 66 drives the connecting block 661 to move, the connecting block 661 drives the rack 64 to move, the rack 64 drives the second driving gear 63 to rotate in the moving process, the second driving gear 63 drives the transmission gear 62 to rotate, the transmission gear 62 synchronously drives the two first driving gears 61 to rotate, the first driving gear 61 drives the thread forming sleeve 32 to rotate, so that the thread forming sleeve 32 moves towards one end of the thread sleeve 52 at the moment, the thread forming sleeve 32 is used for enabling the external thread formed on the plastic workpiece 14 to be separated from the internal thread on the plastic workpiece 14, at the moment, the injection molding machine drives the movable mold 2 to move away from the fixed mold, the ejection cylinder drives the ejector rod to move, the ejector rod drives the upper fixing plate 10 and the lower fixing plate 11 to move towards the supporting plate 23, and the ejector pin 121 on the upper fixing plate 10 drives the push plate 13 to, so that the push plate 13 pushes the molded plastic workpiece 14 out of the core rod 31, thereby realizing demolding.

The above embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims (9)

1. A double-cavity injection mold comprises a fixed mold and a movable mold (2), wherein the fixed mold is provided with at least two cavities; the die comprises a moving die (2), a base plate (22), a supporting plate (23), a male die plate (24) and an ejection assembly, wherein the base plate (22), the supporting plate (23) and the male die plate (24) are fixedly arranged on two sides of the base plate of the moving die (2) respectively, the ejection assembly is used for ejecting a molded plastic workpiece (14), two sides of the supporting plate (23) are fixedly arranged on the base plate (22) respectively, the male die plate (24) is fixedly arranged on one side, deviating from the base plate (22), of the supporting plate (23), at least two cores (3) are correspondingly arranged on the male die plate (24), and a gap for molding the plastic workpiece (14) is formed between each core (3) and; the method is characterized in that: every core (3) all fixed cover is equipped with first drive gear (61), drive gear (62) of first drive gear (61) meshing, the coaxial fixedly connected with second drive gear (63) of drive gear (62), second drive gear (63) meshing has rack (64), bearing plate (23) are fixed and are provided with adjusting cylinder (66), the fixed connecting block (661) that is provided with of piston shaft of adjusting cylinder (66), connecting block (661) are rectangular block-shaped basically, draw-in groove (662) have been seted up to connecting block (661) deviating from the lateral wall of piston shaft, one side of draw-in groove (662) is equipped with the card mouth, the one end of rack (64) corresponds fixed fixture block (65) that is provided with and draw-in groove (662) joint complex.

2. The dual-cavity injection mold of claim 1, wherein: the clamping groove (662) comprises a first clamping end (6621) and a second clamping end (6622), the first clamping end (6621) of the clamping groove (662) is fixedly and convexly provided with a first limiting block (6623) towards the direction inside the clamping groove (662), and the clamping block (65) is correspondingly provided with a butting groove (651) butted with the first limiting block (6623); one side of the clamping block (65) is correspondingly provided with a first avoiding groove (652) for the second clamping end (6622) of the clamping groove (662) to be clamped in.

3. A dual-cavity injection mold as defined in claim 2, wherein: and chamfers are arranged at the corners of the first avoiding groove (652).

4. A dual-cavity injection mold as defined in claim 2, wherein: the corner of the butt joint groove (651) is provided with arc transition, and the first limiting block (6623) is correspondingly provided with arc transition.

5. The dual-cavity injection mold as set forth in claim 4, wherein: the first limiting block (6623) and the first clamping end (6621) of the clamping groove (662) are integrally formed.

6. The dual-cavity injection mold as set forth in claim 5, wherein: the length between the second clamping end (6622) of the clamping groove (662) and the bottom of the clamping groove (662) is smaller than the length between the side wall of the first limiting block (6623) far away from the clamping groove (662) and the bottom of the clamping groove (662).

7. The dual-cavity injection mold of claim 1, wherein: the side wall of the supporting plate (23) is fixedly provided with an installation seat (8), the cylinder body of the adjusting cylinder (66) is fixedly arranged on the side wall of the installation seat (8), the installation seat (8) is provided with a first guide groove (82) for a piston shaft of the adjusting cylinder (66) to penetrate through, one side of the first guide groove (82) is provided with an opening, and the connecting block (661) and the rack (64) can slide along the first guide groove (82).

8. The dual-cavity injection mold as set forth in claim 7, wherein: two opposite side walls of the connecting block (661) can abut against two opposite groove walls of the first guide groove (82).

9. The dual-cavity injection mold as set forth in claim 7, wherein: the adjusting cylinder (66) is fixed on the mounting seat (8) through a plurality of bolts.

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