CN210733111U

CN210733111U - Three-plate die

Info

Publication number: CN210733111U
Application number: CN201921713232.6U
Authority: CN
Inventors: 刘海华
Original assignee: Dongguan Shen An Plastic Mold Co ltd
Current assignee: Dongguan Shen An Plastic Mold Co ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-06-12
Anticipated expiration: 2029-10-12

Abstract

The utility model relates to a mould field, more specifically say, it relates to a three-plate mould. The key points of the technical scheme are as follows: the utility model provides a three-plate die, includes front mould, back mould and supplementary die sinking device, wherein, the front mould includes preceding die carrier bottom plate, first preceding die carrier and the preceding die carrier of second, on the die carrier bottom plate before first preceding die carrier sets up, the die carrier setting is on first preceding die carrier before the second, the back mould includes back die carrier bottom plate and back die carrier, back die carrier with back die carrier bottom plate is opening and shutting the mould in-process common motion, supplementary die sinking device is installed on the front mould for supplementary second grade die sinking that realizes the mould. The utility model discloses a three-plate mold, can realize the second grade die sinking of mould better; the structure is simple, the cost is low, and the two-stage opening and closing of the three-plate die can be realized only by arranging a simple mechanism on the die.

Description

Three-plate die

Technical Field

The utility model relates to a mould field, more specifically say, it relates to a three-plate mould.

Background

The three-plate die is a die needing two-stage die opening and is suitable for processing some complex workpieces.

At present, the mode of realizing the two-stage mold opening of the three-plate mold is realized by changing a mold opening and closing device on an injection molding machine.

However, such a method requires a corresponding modification of the injection molding machine, which is troublesome, and the moving mechanism required for increasing the first-stage mold opening generally has the disadvantages of complex structure and high cost.

Therefore, there is a need for a three-plate mold designed to overcome the above problems.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a three-plate mold can realize the second grade die sinking under the condition that need not reequip the mould device that opens and shuts on the injection molding machine.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a three-plate die, includes front mould, back mould and supplementary die sinking device, wherein, the front mould includes preceding die carrier bottom plate, first preceding die carrier and the preceding die carrier of second, on the die carrier bottom plate before first preceding die carrier sets up, the die carrier setting is on first preceding die carrier before the second, the back mould includes back die carrier bottom plate and back die carrier, back die carrier with back die carrier bottom plate is opening and shutting the mould in-process common motion, supplementary die sinking device is installed on the front mould for supplementary second grade die sinking that realizes the mould.

Through adopting above-mentioned technical scheme, this mould needs the three board of die sinking to be die carrier and back die carrier before first preceding die carrier, second respectively, supplementary die sinking setting can make the separation of die carrier before first preceding die carrier and the second on the front mould, and the mould opening and closing device on the injection molding machine can make the separation of front mould and back mould, like this, just can realize the second grade separation of mould.

The utility model discloses further set up to: the auxiliary die sinking device comprises an electric cylinder and two fixing blocks, the two fixing blocks are arranged on the side wall of the first front die carrier and the side wall of the second front die carrier respectively, and a cylinder body and a telescopic shaft of the electric cylinder are fixedly connected with the two fixing blocks respectively.

Through adopting above-mentioned technical scheme, electronic jar can promote two fixed block phase separations, and then makes the die carrier phase separation before first preceding die carrier and the second.

The utility model discloses further set up to: supplementary mold opening device includes fixing base, first supplementary pole, the supplementary pole that opens and shuts of second, chucking piece and elastic component, wherein, first supplementary pole that opens and shuts includes first fixed part, first hook portion and first main part, first fixed part, first hook portion and first main part integrated into one piece, first main part sets up between first fixed part and the first main part, first fixed part is fixed to be set up preceding die carrier bottom plate department.

The second auxiliary opening and closing rod comprises a second fixing part, a second hooking part and a second main body part, the second fixing part, the second hooking part and the second main body part are integrally formed, the second main body part is arranged between the first fixing part and the second main body part, and the second fixing part is fixedly arranged at the rear die carrier.

The fixing base is fixedly arranged on the second front die frame, a first yielding hole and a second yielding hole are formed in the fixing base along the die opening and closing direction of the die, the first yielding hole is used for enabling the first main body portion to penetrate, and the second yielding hole is used for enabling the second main body portion to penetrate.

The chucking piece is provided with connecting portion, first chucking portion and second chucking portion all with connecting portion fixed connection, have one section clearance between first chucking portion and the second chucking portion, the fixing base still is provided with the groove that slides that supplies the chucking piece to slide, the chucking piece can be at the inslot that slides along the direction with die sinking direction vertically removal.

The elastic component sets up at the inslot that slides, and one end is connected with the chucking piece, and the other end is connected with the cell wall in groove that slides, and the elastic component sets up along the direction of sliding of chucking piece under the effect of elastic component, first chucking piece can with first main part butt, the second chucking portion can with second main part butt.

The second clamping part can cooperate with the second hooking part to limit the second auxiliary opening and closing rod to be drawn out of the second abdicating hole, the first clamping part can cooperate with the first hooking part to enable the clamping block to compress the elastic part, and the limiting relation of the second clamping part to the second hooking part is released.

Through adopting above-mentioned technical scheme, during the die sinking, the mould clamping device that opens and shuts on the injection molding machine can drive the back die carrier and keep away from preceding die carrier bottom plate motion, because the limiting displacement of second clamping part to second hooking part, the supplementary pole and the fixing base that open and shut of second keep away from preceding die carrier bottom plate motion in the lump, and then make preceding die carrier of second and back die carrier keep away from preceding die carrier bottom plate motion in the lump, realize first order die sinking, the first main part of the first supplementary pole that opens and shuts of this moment removes in the first hole of stepping down. When the first hooking part of the first auxiliary opening and closing rod moves to the position matched with the first clamping part, the first clamping part and the first hooking part are matched to enable the clamping block to compress the elastic piece, at the moment, the limit relation of the second hooking part by the second clamping part is released, the opening and closing device on the injection molding machine continues to drive the rear mold frame to be far away from the front mold frame bottom plate, the second front mold frame is not driven to move, the second front mold frame is separated from the rear mold frame, and the secondary demolding of the mold is realized.

The utility model discloses further set up to: the elastic piece is a spring.

Through adopting above-mentioned technical scheme, the spring is a common elastic component, can realize the elasticity better and reply the function.

The utility model discloses further set up to: the clamping block is provided with a spring groove, and one end of the spring connected with the clamping block is arranged in the spring groove.

Through adopting above-mentioned technical scheme, the setting of spring groove for the displacement more is difficult to appear in the spring groove, perhaps to the condition of both sides deformation.

The utility model discloses further set up to: the spring tensioning adjusting mechanism comprises a thread groove formed in the fixing base and a thread block arranged in the thread groove, the thread block is fixedly connected with the thread groove, the arranging direction of the thread groove is consistent with the direction of the spring, the thread groove is communicated with the sliding groove, and one end of the spring is fixedly connected with the thread block.

Through adopting above-mentioned technical scheme, only need adjust the position of screw thread piece in the thread groove, just can realize adjusting spring tensile force.

The utility model discloses further set up to: and one end of the thread block, which is not connected with the spring, is provided with a hexagonal hole.

Through adopting above-mentioned technical scheme, the screw thread piece sets up the hexagonal hole for operation workman can adjust the dynamics that compresses tightly of spring to the chucking piece through hexagonal spanner.

The utility model discloses further set up to: the first hooking part is provided with a first inclined plane and a second inclined plane, the first clamping part is provided with a third inclined plane and a fourth inclined plane, the second hooking part is provided with a fifth inclined plane, the second clamping part is provided with a sixth inclined plane, the fifth inclined plane and the sixth inclined plane are matched to enable the clamping block to compress the elastic piece, the second inclined plane and the third inclined plane are matched to enable the clamping block to compress the elastic piece, and the first inclined plane and the fourth inclined plane are matched to compress the elastic piece.

Through adopting above-mentioned technical scheme, the inclined plane cooperation is a better cooperation mode, and the cooperation on first inclined plane, fourth inclined plane to and the cooperation on sixth inclined plane and fifth inclined plane all are for the compound die process is more unobstructed, and the cooperation on second inclined plane and third inclined plane is mainly that the die sinking for the second grade is more smooth and easy.

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

firstly, the secondary die opening of the die can be better realized;

and secondly, the structure is simple, the cost is low, and the two-stage opening and closing of the three-plate die can be realized only by arranging a simple mechanism on the die.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1;

FIG. 2 is a schematic view of the entire structure of embodiment 2;

FIG. 3 is a schematic view showing an assembling relationship of the auxiliary mold opening device in embodiment 2;

FIG. 4 is a schematic view showing another assembling relationship of the auxiliary mold opening device in embodiment 2;

FIG. 5 is a schematic view showing the relationship between slopes of the auxiliary mold opening device in example 2;

fig. 6 is a schematic view showing the assembling relationship of the spring in embodiment 3.

In the figure: 1. a front mold frame base plate; 2. a first front mold frame; 3. a second front mold frame; 4. fixing one block; 5. fixing the two blocks; 6. a rear mould frame; 7. square iron; 8. a rear mould base plate; 9. a support pillar; 10. a slide push plate; 11. a push plate guide post; 12. a fixed seat; 12a, a first yielding hole; 12b, a second abdicating hole; 12c, a sliding groove; 13. a first auxiliary opening and closing rod; 13a, a first hooking part; 13b, a first body portion; 13c, a first fixing part; 14. a second auxiliary opening and closing rod; 14a, a second hooking part; 14b, a second body portion; 14c, a second fixing part; 15. a clamping block; 15a, a first clamping part; 15b, a second clamping part; 15c, a connecting part; 16. a spring; 17. a first inclined plane; 18. a second inclined plane; 19. a third inclined plane; 20. a fourth slope; 21. a fifth bevel; 22. a sixth slope; 23. a spring slot; 24. a thread block; 24a, a hexagonal hole; 25. a thread groove.

Detailed Description

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

In which like parts are designated by like reference numerals. It should be noted that the following description uses terms of orientation such as "front and back end," "left and right sides," "above," "below," and the like to refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" to refer to directions toward and away from, respectively, the geometric center of a particular component. In addition, the descriptions of "mounted on … …", "disposed on … …" and the like refer to two components having a certain connection and positional relationship, and do not refer to one component being on the upper surface of the other component. In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the case of the example 1, the following examples are given,

referring to fig. 1, a three-plate mold includes a front mold, a rear mold, and an auxiliary mold opening device mounted on the front mold for assisting in achieving a secondary mold opening of the mold. Four supporting columns 9 are arranged on the mould, so that the mould can be better placed when being transported or stored.

The front mold comprises a front mold frame base plate 1, a first front mold frame 2 and a second front mold frame 3, wherein the first front mold frame 2 is arranged on the front mold frame base plate 1, the second front mold frame 3 is arranged on the first front mold frame 2, and the arrangement on … … refers to an assembly sequence, namely the front mold is assembled according to the sequence of the front mold frame base plate 1, the first front mold frame 2 and the second front mold frame 3.

The rear die comprises a rear die carrier bottom plate 8, a rear die carrier 6, two square irons 7, a line position push plate 10 and a push plate guide pillar 11, wherein the two square irons 7 are arranged on two sides of the rear die carrier 6, the rear die carrier 6 is arranged on one side, far away from the rear die carrier bottom plate 8, of the two square irons 7, the line position push plate 10 is arranged between the two square irons 7, and the push plate guide pillar 11 is arranged between the rear die carrier bottom plate 8 and the rear die carrier 6 and used for guiding the line position push plate 10.

In the mould, a fixed block 4 is arranged on the second front mould frame 3, a fixed block 5 is arranged on the rear mould frame 6, the fixed block 4 and the fixed block 5 are respectively provided with a bulge and a recess which are matched with each other, and the fixed block 4 and the fixed block 5 can be mutually matched to strengthen the positioning effect during mould closing.

The auxiliary mold opening device comprises an electric cylinder (not shown in the figure) and two fixing blocks (not shown in the figure), the two fixing blocks are respectively arranged on the side walls of the first front mold frame 2 and the second front mold frame 3, and a cylinder body and a telescopic shaft of the electric cylinder are respectively fixedly connected with the two fixing blocks.

The three plates of the mold needing mold opening are respectively a first front mold frame 2, a second front mold frame 3 and a rear mold frame 6, and the principle of the secondary mold opening of the embodiment is as follows: the electronic jar can promote two fixed block phase separations, and then makes the 3 phase separations of first preceding die carrier 2 and the 3 phase separations of second preceding die carrier, can make the separation of first preceding die carrier 2 and the 3 phase separations of second preceding die carrier, and the mold opening and closing device on the injection molding machine can make front mould and back mould separation, like this, just can realize the second grade separation of mould.

In the case of the example 2, the following examples are given,

the structure of the mold of the present embodiment is the same as that of the mold of embodiment 1, except that the auxiliary mold opening device of the present embodiment is different.

Referring to fig. 2 and 3, the auxiliary mold opening device of this embodiment includes a fixing seat 12, a first auxiliary opening/closing rod 13, a second auxiliary opening/closing rod 14, a clamping block 15, and an elastic member, specifically, the elastic member of this embodiment is a spring 16, it should be understood that in other embodiments, the elastic member may also be an elastic rubber column or other elastic members capable of achieving the purpose of the present invention. It should be further noted that the auxiliary mold opening device of this embodiment is provided with two positions, which are respectively disposed on two opposite sidewalls of the mold, and the two auxiliary mold openings can make the second-stage mold opening of the mold of this embodiment more stable.

Referring to fig. 3 and 4, the first auxiliary opening and closing lever 13 includes a first fixing portion 13c, a first hooking portion 13a, and a first main body portion 13b, the first fixing portion 13c, the first hooking portion 13a, and the first main body portion 13b are integrally formed, the first main body portion 13b is disposed between the first fixing portion 13c and the first main body portion 13b, and the first fixing portion 13c is fixedly disposed at the front mold frame base plate 1.

The second auxiliary opening and closing lever 14 includes a second fixing portion 14c, a second hooking portion 14a, and a second main body portion 14b, the second fixing portion 14c, the second hooking portion 14a, and the second main body portion 14b are integrally formed, the second main body portion 14b is disposed between the first fixing portion 13c and the second main body portion 14b, and the second fixing portion 14c is fixedly disposed at the rear mold frame 6.

The fixing seat 12 is fixedly arranged on the second front mold frame 3, the fixing seat 12 is provided with a first yielding hole 12a and a second yielding hole 12b along the mold opening and closing direction of the mold, the first yielding hole 12a is used for the first main body part 13b to pass through, and the second yielding hole 12b is used for the second main body part 14b to pass through.

Chucking piece 15 is provided with connecting portion 15c, first chucking portion 15a and second chucking portion 15b all with connecting portion 15c fixed connection, there is one section clearance between first chucking portion 15a and the second chucking portion 15b, fixing base 12 still is provided with the groove 12c that slides that supplies chucking piece 15 to slide, chucking piece 15 can move along the direction perpendicular with the die sinking direction in the groove 12c that slides.

The spring 16 is disposed in the sliding groove 12c, one end of the spring is fixedly connected to the clamping block 15, the spring 16 may be fixedly connected to the connecting portion 15c of the clamping block 15, or may be fixedly connected to the second clamping portion 15b of the clamping block 15, the other end of the spring is fixedly connected to the groove wall of the sliding groove 12c, the spring 16 is disposed along the sliding direction of the clamping block 15, the first clamping block 15 can abut against the first main body portion 13b, and the second clamping portion 15b can abut against the second main body portion 14b under the action of the spring 16.

Referring to fig. 5, the first hooking portion 13a is provided with a first inclined surface 17 and a second inclined surface 18, the first clamping portion 15a is provided with a third inclined surface 19 and a fourth inclined surface 20, the second hooking portion 14a is provided with a fifth inclined surface 21, the second clamping portion 15b is provided with a sixth inclined surface 22, the fifth inclined surface 21 and the sixth inclined surface 22 cooperate to enable the clamping block 15 to compress the spring 16, the second inclined surface 18 and the third inclined surface 19 cooperate to enable the clamping block 15 to compress the spring 16, and the first inclined surface 17 and the fourth inclined surface 20 cooperate to compress the spring 16.

The second locking part 15b can be matched with the second hooking part 14a to limit the second auxiliary opening and closing rod 14 from being drawn out of the second abdicating hole 12b, the first locking part 15a can be matched with the first hooking part 13a to enable the locking block 15 to compress the spring 16, and the limiting relation of the second locking part 15b to the second hooking part 14a is released.

The working principle of the embodiment is as follows:

during the die sinking, the last mold opening and closing device of injection molding machine can drive back die carrier 6 and keep away from preceding die carrier bottom plate 1 motion, because second chucking part 15b to the second hooking part 14 a's limiting displacement, the supplementary pole 14 that opens and shuts of second and the motion of preceding die carrier bottom plate 1 is kept away from in the lump to fixing base 12, and then make the preceding die carrier bottom plate 1 motion of keeping away from in the lump of second preceding die carrier 3 and back die carrier 6, realize first order die sinking, the first main part 13b of the first supplementary pole 13 that opens and shuts of this moment moves in the first hole 12a that steps down. When the first hooking part 13a of the first auxiliary opening and closing rod 13 moves to the position matched with the first clamping part 15a, the first clamping part 15a and the first hooking part 13a are matched to enable the clamping block 15 to compress the spring 16, and the first clamping part 15a and the first hooking part 13a are matched to be realized through the matching of the second inclined surface 18 and the third inclined surface 19, at the moment, the limit relation of the second clamping part 15b to the second hooking part 14a is released, the mold opening and closing device on the injection molding machine continues to drive the rear mold frame 6 to be far away from the front mold frame base plate 1, and the second front mold frame 3 is not driven to move, so that the second front mold frame 3 is separated from the rear mold frame 6, and the secondary demolding of the mold is realized.

During die assembly, the rear die frame 6 approaches to the front die frame bottom plate 1, firstly, the second auxiliary opening and closing rod 14 enters the second abdicating hole 12b, the fifth inclined surface 21 and the sixth inclined surface 22 are matched to compress the spring 16, then the clamping block 15 enables the second clamping part 15b to be abutted against the second main body part 14b under the action of the spring 16, then the first auxiliary opening and closing rod 13 enters the first abdicating hole 12a, the first inclined surface 17 and the fourth inclined surface 20 are matched to compress the spring 16, then the clamping block 15 enables the first clamping part 15a to be abutted against the first main body part 13b under the action of the spring 16, and finally, complete die assembly is realized under the action of a die opening and closing device on the injection molding machine.

In the case of the example 3, the following examples are given,

the present embodiment has the same shape and structure as embodiment 2, and the same principle of realizing the secondary demolding of the mold, and the difference is that the spring 16 is installed and used slightly differently.

Referring to fig. 6, the clamping block 15 in this embodiment is provided with a spring groove 23, and one end of the spring 16 connected with the clamping block 15 is arranged in the spring groove 23, which means that one end of the spring 16 is fixedly connected with the groove bottom of the spring groove 23. The wall of the sliding groove 12c is also provided with a spring 16 tensioning and adjusting mechanism, the spring 16 tensioning and adjusting mechanism comprises a thread groove 25 arranged on the fixed seat 12 and a thread block 24 arranged in the thread groove 25, the thread block 24 is fixedly connected with the thread groove 25, the opening direction of the thread groove 25 is consistent with the setting direction of the spring 16, the thread groove 25 is communicated with the sliding groove 12c, and one end of the spring 16, which is not connected with the bottom of the spring groove 23, is fixedly connected with the thread block 24. The end of the screw block 24 not connected to the spring 16 is provided with a hexagonal hole 24a, and the hexagonal hole 24a is used when the hexagonal wrench rotates the screw block 24.

The spring 16 of the present embodiment is more stable and firm in installation and use, and the spring 16 tightening mechanism is provided so that the tightening force of the spring 16 can be adjusted.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A three-plate mold, characterized in that: comprises a front die, a rear die and an auxiliary die opening device, wherein,

the front mould comprises a front mould base plate (1), a first front mould base (2) and a second front mould base (3), wherein the first front mould base (2) is arranged on the front mould base plate (1), and the second front mould base (3) is arranged on the first front mould base (2);

the rear die comprises a rear die frame bottom plate (8) and a rear die frame (6), and the rear die frame (6) and the rear die frame bottom plate (8) move together in the die opening and closing process;

the auxiliary mold opening device is arranged on the front mold and is used for assisting in realizing the secondary mold opening of the mold.

2. A three-plate mold according to claim 1, wherein: the auxiliary die sinking device comprises an electric cylinder and two fixing blocks, the two fixing blocks are arranged on the side walls of the first front die frame (2) and the second front die frame (3) respectively, and the cylinder body and the telescopic shaft of the electric cylinder are fixedly connected with the two fixing blocks respectively.

3. A three-plate mold according to claim 1, wherein: the auxiliary mold opening device comprises a fixed seat (12), a first auxiliary opening and closing rod (13), a second auxiliary opening and closing rod (14), a clamping block (15) and an elastic piece, wherein,

the first auxiliary opening and closing rod (13) comprises a first fixing part (13c), a first hooking part (13a) and a first main body part (13b), the first fixing part (13c), the first hooking part (13a) and the first main body part (13b) are integrally formed, the first main body part (13b) is arranged between the first fixing part (13c) and the first main body part (13b), and the first fixing part (13c) is fixedly arranged at the front die carrier bottom plate (1);

the second auxiliary opening and closing rod (14) comprises a second fixing part (14c), a second hooking part (14a) and a second main body part (14b), the second fixing part (14c), the second hooking part (14a) and the second main body part (14b) are integrally formed, the second main body part (14b) is arranged between the first fixing part (13c) and the second main body part (14b), and the second fixing part (14c) is fixedly arranged at the rear die carrier (6);

the fixed seat (12) is fixedly arranged on the second front mold frame (3), a first yielding hole (12a) and a second yielding hole (12b) are formed in the fixed seat (12) along the mold opening and closing direction of the mold, the first yielding hole (12a) is used for allowing the first main body part (13b) to penetrate through, and the second yielding hole (12b) is used for allowing the second main body part (14b) to penetrate through;

the clamping block (15) is provided with a connecting part (15c), a first clamping part (15a) and a second clamping part (15b), the first clamping part (15a) and the second clamping part (15b) are fixedly connected with the connecting part (15c), a gap exists between the first clamping part (15a) and the second clamping part (15b), the fixed seat (12) is further provided with a sliding groove (12c) for the clamping block (15) to slide, and the clamping block (15) can move in the sliding groove (12c) along the direction perpendicular to the mold opening direction;

the elastic piece is arranged in the sliding groove (12c), one end of the elastic piece is connected with the clamping block (15), the other end of the elastic piece is connected with the groove wall of the sliding groove (12c), the elastic piece is arranged along the sliding direction of the clamping block (15), the first clamping block (15) can be abutted against the first main body part (13b) under the action of the elastic piece, and the second clamping part (15b) can be abutted against the second main body part (14 b);

the second clamping part (15b) can be matched with the second hooking part (14a) to limit the second auxiliary opening and closing rod (14) to be drawn out of the second abdicating hole (12b), the first clamping part (15a) can be matched with the first hooking part (13a) to enable the clamping block (15) to compress the elastic piece, and the limiting relation of the second clamping part (15b) to the second hooking part (14a) is released.

4. A three-plate die according to claim 3, wherein: the elastic element is a spring (16).

5. A three-plate die according to claim 4, wherein: the clamping block (15) is provided with a spring groove (23), and one end of the spring (16) connected with the clamping block (15) is arranged in the spring groove (23).

6. A three-plate mold according to claim 5, wherein: still be provided with spring (16) tensioning adjustment mechanism on the cell wall of groove (12c) that slides, spring (16) tensioning adjustment mechanism is including seting up thread groove (25) in fixing base (12) and setting up screw block (24) in thread groove (25), screw block (24) with thread groove (25) fixed connection, the direction of seting up of thread groove (25) is unanimous with the direction that spring (16) set up, just thread groove (25) with slide groove (12c) and communicate with each other, spring (16) one end and screw block (24) fixed connection.

7. A three-plate mold according to claim 6, wherein: and a hexagonal hole (24a) is formed in one end, which is not connected with the spring (16), of the thread block (24).

8. A three-plate die according to claim 3, wherein: the first hooking part (13a) is provided with a first inclined surface (17) and a second inclined surface (18), the first clamping part (15a) is provided with a third inclined surface (19) and a fourth inclined surface (20), the second hooking part (14a) is provided with a fifth inclined surface (21), the second clamping part (15b) is provided with a sixth inclined surface (22), the fifth inclined surface (21) is matched with the sixth inclined surface (22) to enable the clamping block (15) to compress the elastic piece, the second inclined surface (18) is matched with the third inclined surface (19) to enable the clamping block (15) to compress the elastic piece, and the first inclined surface (17) is matched with the fourth inclined surface (20) to compress the elastic piece.