CN113199703A

CN113199703A - Combined injection mold and working method thereof

Info

Publication number: CN113199703A
Application number: CN202110531202.9A
Authority: CN
Inventors: 吴伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-16
Filing date: 2021-05-16
Publication date: 2021-08-03

Abstract

The invention relates to the technical field of injection molds and discloses a combined injection mold and a working method thereof, wherein the combined injection mold comprises a lower mold base, the top of the lower mold base is movably connected with a fixed plate, the top of the lower mold base is provided with a material returning mechanism, the material returning mechanism is positioned at the front part of the fixed plate, the inside of the fixed plate is provided with a fixed mechanism, the top of the fixed plate is movably connected with a female mold, the top of the female mold is movably connected with a male mold, the top of the male mold is connected with an upper mold base through a bolt, the inside of the female mold is provided with a discharging mechanism, the inside of the male mold is provided with a protection mechanism, the combined injection mold and the working method thereof can automatically return discharged products after mold division through the operation of the material returning mechanism, further, manual material returning of workers is not needed, the contact between the workers and the products is reduced, and the risk of injury is reduced, and the working efficiency is improved, and the labor intensity of workers is reduced.

Description

Combined injection mold and working method thereof

Technical Field

The invention relates to the technical field of injection molds, in particular to a combined injection mold and a working method thereof.

Background

An injection mold is a tool for producing plastic products; the injection molding is a processing method used in batch production of parts with complex shapes, and particularly relates to a method for injecting heated and melted plastics into a mold cavity from an injection molding machine at high pressure, and obtaining a molded product after cooling and solidification, wherein the injection molding mold is divided into a thermosetting plastic mold and a thermoplastic plastic mold according to molding characteristics; according to the forming process, the method is divided into a transfer mold, a blow mold, a cast mold, a hot forming mold, a hot pressing mold (compression mold), an injection mold and the like, wherein the hot pressing mold can be divided into a flash type, a semi-flash type and a non-flash type by a flash mode, and the injection mold can be divided into a cold runner mold and a hot runner mold by a pouring system; the device can be divided into a movable type and a fixed type according to the loading and unloading mode.

In the injection mold in the market, a worker needs to manually extend into the mold to take out an injection molded product after mold separation, the temperature of the product which is just molded is higher, the worker can be injured when the worker is not in place for protection, safety accidents can occur if the mold is subjected to mold re-closing accidents, and the manual material returning efficiency is lower; in addition, the existing injection mold is easy to stick to a female die in the molding process, and the processed product is not easy to take out; in the existing injection mold, the female mold and the lower mold base are integrally formed, and when the female mold is worn, the whole lower mold needs to be replaced, so that the manufacturing cost is indirectly increased; therefore, a combined injection mold and a working method thereof are provided to solve the problems.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a combined injection mold and a working method thereof, aiming at the defects in the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a modular injection mold and operating method thereof, includes the die holder, the top swing joint of die holder has the fixed plate, the top of die holder is provided with material returned mechanism, and material returned mechanism is located the front portion of fixed plate, the inside of fixed plate is provided with fixed establishment, the top swing joint of fixed plate has the die, the top swing joint of die has the terrace die, the top of terrace die has the upper die base through bolted connection, the inside of die is provided with discharge mechanism, the inside of terrace die is provided with protection machanism.

Preferably, the material returning mechanism comprises a supporting column, a torsion spring is sleeved on the surface of the supporting column, a fixing column is rotatably connected to the top end of the supporting column, a push rod and a bevel gear are respectively welded on the surface of the fixing column, the bevel gear is located below the push rod, a bevel rack is welded at the bottom of the upper die base, and the bevel rack and the bevel gear of the bevel gear are both 45 degrees in inclination, so that the bevel rack and the bevel gear can be vertically meshed and driven.

Preferably, the bottom end of the supporting column is welded and fixed with the top of the lower die holder, the two ends of the torsion spring are clamped and fixed with the fixing column and the inner wall of the lower die holder respectively, and the number of teeth of the helical rack is only one fourth of the number of teeth of the helical gear, so that the helical rack can only drive the helical gear to rotate ninety degrees, and the helical gear is prevented from rotating too much to cause the torsion spring to be damaged.

Preferably, the fixing mechanism comprises a bidirectional screw, a sliding block is connected to the surface of the bidirectional screw in a threaded manner, sliding grooves are formed in the top of the lower die holder and the bottom of the female die, a first bevel gear is welded to the surface of the bidirectional screw, a second bevel gear is meshed with the surface of the first bevel gear, the number of the second bevel gears is two, and the two second bevel gears are fixedly connected through a connecting rod, so that the bidirectional screw on the other side can be driven to rotate simultaneously by rotating the bidirectional screw on one side.

Preferably, the surface of two-way screw rod rotates with the inner wall of fixed plate to be connected, the surface of slider respectively with the inner wall sliding connection of fixed plate and spout, the both ends of two-way screw rod all weld has the hexagonal fixture block, make things convenient for the workman to use outer hexagonal spanner to rotate it, can also reduce occupying of space when not using.

Preferably, the unloading mechanism is including the stripper, the bottom welding of stripper has the spring of unloading, the bottom welding of terrace die has the depression bar, notes material hole has been seted up to the inside of depression bar, the feed port has all been seted up to the inside of depression bar, terrace die and upper die base, the oil filler point has all been seted up to the inside of upper die base and terrace die, need carry out sealing process between the inner wall of stripper and die, plastics get into the stripper below when preventing to mould plastics, and then lead to the unable shaping of product, make the mould take place to damage even.

Preferably, the surface of stripper and the inner wall sliding connection of die, the bottom of the spring of unloading and the inner wall welded fastening of die, the quantity of the spring of unloading is provided with four, and four springs of unloading all use the centre of a circle of stripper as the distribution of symmetry axis circle array, and the depression bar also is in same axis with the stripper, and the design can increase the stability of stripper like this, takes place the skew when preventing it from removing, and then the card is in the die, and then leads to the mould can't continue to use.

Preferably, protection machanism is including the traveller, the skin weld of traveller has the chuck, reset spring has been cup jointed on the surface of traveller, the oil storage tank has been seted up to the inside of terrace die, the inner wall welding of oil storage tank has the spacing ring, the inlet port has been seted up to the inside of traveller, the passageway has been seted up to the inside of die, can carry out oily interpolation in the oil storage tank through the oil filler point, and the diameter of passageway sets up by oneself according to the kind of actual oil, only need oil can slowly permeate into, the passageway diameter can not be too big, and then leads to the oil to flow in a large number, can lead to the unable normal shaping of product.

Preferably, the bottom of traveller and the top of die contact each other, the surface of traveller and chuck all with the inner wall sliding connection of terrace die, reset spring's both ends respectively with the top of chuck and the inner wall of terrace die contact each other, the surface of traveller and the inner wall sliding connection of spacing ring, reset spring can drive the traveller through the chuck and reset, carries out the oil impregnate operation when making things convenient for the compound die next time.

A working method of a combined injection mold comprises the following steps:

the method comprises the following steps: during installation, the lower die holder is sequentially aligned with the fixing plate and the female die, and the sliding blocks respectively enter the sliding chutes of the lower die holder and the female die;

step two: the two-way screw rotates and drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the two-way screws to rotate simultaneously, the two sliding blocks move reversely and move into the sliding grooves, and the lower die holder and the female die are fixed;

step three: when the die is closed, the upper die base drives the helical rack to move downwards and drives the helical gear to rotate, the helical gear drives the fixed column to rotate clockwise and drives the push rod to rotate together, after the die is closed, the helical rack is separated from the helical gear, and the push rod is reset under the action of the torsion spring;

step four: when the die is closed, the female die is contacted with the male die, the sliding column is jacked up by the female die, the sliding column drives the reset spring to contract through the chuck, meanwhile, the oil inlet hole extends out of the limit ring, oil in the oil storage tank enters the oil inlet hole and permeates into the channel, and the oil permeates into the female die from the channel;

step five: when the die is closed, the male die is driven by the upper die base to move downwards and drive the pressure rod to move downwards, the pressure rod pushes the stripper plate to move downwards, the stripper plate is compressed by the stripper spring, injection molding is carried out in the feed hole, and the die is separated after cooling;

step six: when the mold is separated, the pressing rod moves upwards, the discharging spring drives the discharging plate to move upwards, the discharging plate pushes out a formed product, the upper die base drives the helical rack to move upwards and drives the helical gear to rotate anticlockwise, the helical gear drives the fixing column to drive the push rod to rotate so as to return the product, and after the mold separation is finished, the push rod is reset by the torsion spring.

By adopting the technical scheme, the invention can bring the following beneficial effects:

1. the operation through material returned mechanism can be automatic carry out the material returned to the product after unloading after the mould divides the mould, and then need not the manual material returned of workman, reduces the contact between workman and the product, reduces injured risk to increased work efficiency, reduced workman's intensity of labour.

2. The die can be conveniently combined through the fixing mechanism, so that the die is more convenient and quicker to produce and assemble, the assembling time is shortened, and the working efficiency is improved.

3. The product after the shaping can be unloaded automatically through shedding mechanism, prevents that the product still is arranged in the die after the mould divides, and then can't return the material, influences the practicality of device.

4. Can carry out the fat liquoring to the die when the compound die through protection machanism, when preventing injection moulding, plastics glue at the die inner wall, and then can't take out after leading to the product shaping, be unfavorable for using widely.

5. The compound die through the mould can drive material returned mechanism, shedding mechanism and protection machanism function simultaneously, can reduce placing of power supply, and then reduces the input of cost, can also reduce occuping of space, realizes the synchronous operation between each mechanism, and work efficiency can promote.

6. Set up into the component structure with die and die holder, after the die wearing and tearing, can change alone the die can, need not to change whole lower mould, can effectively reduce cost, can also provide the efficiency of changing.

Drawings

FIG. 1 is a schematic view of an overall structure of a combined injection mold according to the present invention;

FIG. 2 is a schematic view of a portion of a modular injection mold according to the present invention;

FIG. 3 is a schematic view of a material returning mechanism of a combined injection mold according to the present invention;

FIG. 4 is a schematic view of a fixing mechanism of a combined injection mold according to the present invention;

FIG. 5 is a schematic view of a discharge mechanism of a combined injection mold according to the present invention;

FIG. 6 is a schematic view of a combined injection mold protection mechanism according to the present invention;

FIG. 7 is a sectional view of a combined injection mold guard mechanism according to the present invention.

In the figure: 1. a lower die holder; 2. a fixing plate; 3. a material returning mechanism; 31. a support pillar; 32. a torsion spring; 33. fixing a column; 34. a push rod; 35. a helical gear; 36. a helical rack; 4. a fixing mechanism; 41. a bidirectional screw; 42. a slider; 43. a chute; 44. a first bevel gear; 45. a second bevel gear; 5. a female die; 6. a male die; 7. an upper die holder; 8. a discharge mechanism; 81. a stripper plate; 82. a discharge spring; 83. a pressure lever; 84. a material injection hole; 85. a feed port; 86. an oil filler hole; 9. a protection mechanism; 91. a traveler; 92. a chuck; 93. a return spring; 94. an oil inlet hole; 95. a limiting ring; 96. an oil storage tank; 97. a channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A combined injection mold and a working method thereof are disclosed, as shown in figures 1-5, comprising a lower mold base 1, a fixed plate 2 is movably connected with the top of the lower mold base 1, a material returning mechanism 3 is arranged on the top of the lower mold base 1, the material returning mechanism 3 is positioned at the front part of the fixed plate 2, the fixed mechanism 4 is arranged inside the fixed plate 2, the top part of the fixed plate 2 is movably connected with a female die 5, the top part of the female die 5 is movably connected with a male die 6, the top part of the male die 6 is connected with an upper die base 7 through a bolt, the female die 5 is internally provided with a discharging mechanism 8, the male die 6 is internally provided with a protection mechanism 9, the discharging mechanism 3 can automatically discharge the discharged product after the mould is separated, and then need not the manual material returned of workman, reduce the contact between workman and the product, reduce injured risk to increased work efficiency, reduced workman's intensity of labour.

In this embodiment, the material returning mechanism 3 includes a supporting column 31, a torsion spring 32 is sleeved on the surface of the supporting column 31, a fixing column 33 is rotatably connected to the top end of the supporting column 31, a push rod 34 and a helical gear 35 are respectively welded on the surface of the fixing column 33, the helical gear 35 is located below the push rod 34, a helical rack 36 is welded at the bottom of the upper die base 7, and the tooth inclinations of the helical rack 36 and the helical gear 35 are both 45 degrees, so that the helical rack and the helical gear can be vertically meshed and driven.

Further, the bottom end of the supporting column 31 is welded and fixed with the top of the lower die holder 1, two ends of the torsion spring 32 are clamped and fixed with the fixing column 33 and the inner wall of the lower die holder 1, and the number of teeth of the helical gear rack 36 is only one fourth of the number of teeth of the helical gear 35, so that the helical gear rack 36 only drives the helical gear 35 to rotate ninety degrees, and the helical gear 35 is prevented from rotating too much to cause the torsion spring 32 to be damaged.

Furthermore, the fixing mechanism 4 comprises a bidirectional screw rod 41, a sliding block 42 is in threaded connection with the surface of the bidirectional screw rod 41, sliding grooves 43 are formed in the top of the lower die holder 1 and the bottom of the female die 5, a first bevel gear 44 is welded on the surface of the bidirectional screw rod 41, a second bevel gear 45 is meshed on the surface of the first bevel gear 44, and the fixing mechanism 4 can facilitate die assembly, so that the die assembly is more convenient and rapid to produce and assemble, the assembling time is shortened, and the working efficiency is improved.

In addition, the surface of two-way screw rod 41 rotates with the inner wall of fixed plate 2 to be connected, the surface of slider 42 respectively with the inner wall sliding connection of fixed plate 2 and spout 43, No. two bevel gear 45's quantity is provided with two, and carry out fixed connection through the connecting rod between two No. two bevel gear 45, thereby can drive the two-way screw rod 41 simultaneous rotation of another side through rotatory two-way screw rod 41 on one side, and hexagonal fixture block has all been welded at two ends of two-way screw rod 41, make things convenient for the workman to use outer hexagonal spanner to rotate it, can also reduce the occupation in space when not using.

Besides, shedding mechanism 8 is including stripper 81, stripper 81's bottom welding has discharge spring 82, punch 6's bottom welding has depression bar 83, annotate material hole 84 has been seted up to depression bar 83's inside, depression bar 83, feed port 85 has all been seted up to the inside of terrace die 6 and last die holder 7, oil filler point 86 has all been seted up to the inside of last die holder 7 and terrace die 6, can unload the product after the shaping automatically through shedding mechanism 8, prevent that the product still is located die 5 behind the split die, and then can't carry out the material returned, influence the practicality of device.

As shown in fig. 5-7, the surface of the discharging plate 81 is slidably connected with the inner wall of the female die 5, the bottom end of the discharging spring 82 is welded and fixed with the inner wall of the female die 5, sealing treatment is required between the discharging plate 81 and the inner wall of the female die 5, plastic is prevented from entering the lower part of the discharging plate 81 during injection molding, and further a product cannot be molded, even the die is damaged, the number of the discharging springs 82 is four, the four discharging springs 82 are distributed in a circular array mode by taking the circle center of the discharging plate 81 as a symmetry axis, and the pressing rod 83 is also located on the same axis with the discharging plate 81, so that the stability of the discharging plate 81 can be improved, deviation is prevented during movement, and further the discharging plate is clamped in the female die 5, and further the die cannot be used continuously.

It is worth noting that protection machanism 9 is including traveller 91, the skin weld of traveller 91 has chuck 92, reset spring 93 has been cup jointed on the surface of traveller 91, oil storage tank 96 has been seted up to the inside of terrace die 6, the inner wall welding of oil storage tank 96 has spacing ring 95, inlet port 94 has been seted up to the inside of traveller 91, passageway 97 has been seted up to the inside of die 5, can carry out the fat liquoring to die 5 when the compound die through protection machanism 9, when preventing injection moulding, plastics glue at the inner wall of die 5, and then can't take out after leading to the product shaping, be unfavorable for using widely.

It is worth to say that the bottom end of the sliding column 91 is in contact with the top of the female die 5, the surfaces of the sliding column 91 and the chuck 92 are in sliding connection with the inner wall of the male die 6, the two ends of the return spring 93 are in contact with the top end of the chuck 92 and the inner wall of the male die 6 respectively, the surface of the sliding column 91 is in sliding connection with the inner wall of the limit ring 95, oil can be added into the oil storage groove 96 through the oil filling hole 86, the diameter of the channel 97 is set according to the type of actual oil, only the oil can slowly permeate into the channel, the diameter of the channel 97 cannot be too large, and further a large amount of oil flows into the channel, so that a product cannot be molded normally, and the return spring 93 can drive the sliding column 91 to reset through the chuck 92, so that oil permeating operation is convenient for next die assembly.

In this embodiment, an operating method of the combined injection mold includes the following steps:

the method comprises the following steps: during installation, the fixing plate 2 and the female die 5 are sequentially placed on the lower die holder 1 in an aligned mode, and the sliding blocks 42 respectively enter the sliding grooves 43 of the lower die holder 1 and the female die 5;

step two: the bidirectional screw rods 41 rotate and drive the first bevel gear 44 to rotate, the first bevel gear 44 drives the second bevel gear 45 to rotate, the second bevel gear 45 drives the two bidirectional screw rods 41 to rotate simultaneously, the two sliding blocks 42 move reversely and move into the sliding grooves 43, and the lower die holder 1 and the female die 5 are fixed;

step three: when the die is closed, the upper die base 7 drives the helical rack 36 to move downwards and drives the helical gear 35 to rotate, the helical gear 35 drives the fixed column 33 to rotate clockwise and drives the push rod 34 to rotate together, after the die is closed, the helical rack 36 is separated from the helical gear 35, and the push rod 34 is reset under the action of the torsion spring 32;

step four: when the die is closed, the female die 5 is in contact with the male die 6, the sliding column 91 is jacked up by the female die 5, the sliding column 91 drives the return spring 93 to contract through the chuck 92, meanwhile, the oil inlet hole 94 extends out of the limiting ring 95, oil in the oil storage groove 96 enters the oil inlet hole 94 and permeates into the channel 97, and the oil permeates into the female die 5 from the channel 97;

step five: when the die is closed, the upper die base 7 drives the male die 6 to move downwards and drives the pressure rod 83 to move downwards, the pressure rod 83 pushes the discharging plate 81 to move downwards, the discharging spring 82 in the discharging plate 81 is compressed, the feeding hole 85 is injected with plastic, and the die is separated after cooling;

step six: during mold separation, the pressing rod 83 moves upwards, the discharging spring 82 drives the discharging plate 81 to move upwards, the discharging plate 81 pushes out a formed product, the upper mold base 7 drives the helical rack 36 to move upwards and drive the helical gear 35 to rotate anticlockwise, the helical gear 35 drives the fixing column 33 to drive the push rod 34 to rotate so as to return the product, and after mold separation is finished, the push rod 34 is reset by the torsion spring 32.

Working principle, during installation, the fixing plate 2 and the female die 5 are sequentially placed on the lower die holder 1 in an aligned manner, the sliding blocks 42 respectively enter the sliding grooves 43 at the top of the lower die holder 1 and at the bottom of the female die 5, the bidirectional screw 41 is rotated by using an external hexagonal wrench, the bidirectional screw 41 drives the first bevel gear 44 to rotate, the first bevel gear 44 drives the second bevel gear 45 to rotate, the second bevel gear 45 drives the other bidirectional screw 41 to rotate together, and further drives the two sliding blocks 42 to move in the opposite direction, the sliding blocks 42 move into the sliding grooves 43 and fix the lower die holder 1 and the female die 5, so that the die can be conveniently combined, the production and assembly are more convenient and faster, the assembly time is reduced, the working efficiency is increased, during die assembly, the upper die holder 7 drives the helical rack 36 to move downwards, the helical rack 36 drives the helical gear 35 to rotate, the helical gear 35 drives the fixing column 33 to rotate clockwise, the fixed column 33 drives the push rod 34 to rotate clockwise, the oblique rack 36 is separated from the oblique gear 35 after die assembly, at this time, the push rod 34 can reset under the action of the torsion spring 32, the female die 5 is contacted with the male die 6 during die assembly, so that the slide column 91 is jacked up by the female die 5, the slide column 91 can drive the reset spring 93 to shrink through the chuck 92, meanwhile, the oil inlet 94 can extend out from the limit ring 95, at this time, oil in the oil storage tank 96 can permeate into the channel 97 through the oil inlet 94 and enter the female die 5 from the channel 97, lubrication and adhesion prevention are carried out on the female die 5, when injection molding is carried out, plastic is stuck on the inner wall of the female die 5, so that the product cannot be taken out after molding, popularization and use are not facilitated, the upper die base 7 drives the male die 6 to move downwards, the male die 6 drives the press rod 83 to move downwards, the press rod 83 pushes the discharge plate 81 to move downwards, the discharge plate 81 can compress the discharge spring 82, at this time, injection molding is carried out through the feed hole 85 after the lubricating oil flows in, the mold is divided after the mold is cooled, during mold division, the stripper plate 81 is not pressed continuously due to upward movement of the pressure rod 83, at this time, the stripper plate 81 is driven to move upward by the discharge spring 82, the stripper plate 81 pushes out a formed product under the action of lubricating oil, meanwhile, the upper mold base 7 drives the helical rack 36 to move upward, the helical rack 36 drives the helical gear 35 to rotate anticlockwise, the helical gear 35 drives the push rod 34 to rotate through the fixed column 33, the push rod 34 can return the discharged product, so that the discharged product is automatically returned without manual return of workers, contact between the workers and the product is reduced, the risk of injury is reduced, the working efficiency is increased, the labor intensity of the workers is reduced, and after mold division is finished, the push rod 34 is reset under the action of the torsion spring 32.

The present invention provides a combined injection mold and a working method thereof, and a plurality of methods and ways for implementing the technical scheme, and the above description is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, a plurality of 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. All the components not specified in the present embodiment can be realized by the prior art.

Claims

1. The utility model provides a modular injection mold, includes die holder (1), its characterized in that: the top swing joint of die holder (1) has fixed plate (2), the top of die holder (1) is provided with material returned mechanism (3), and material returned mechanism (3) are located the front portion of fixed plate (2), the inside of fixed plate (2) is provided with fixed establishment (4), the top swing joint of fixed plate (2) has die (5), the top swing joint of die (5) has terrace die (6), there is upper die base (7) at the top of terrace die (6) through bolted connection, the inside of die (5) is provided with shedding mechanism (8), the inside of terrace die (6) is provided with protection machanism (9).

2. A modular injection mold as claimed in claim 1, characterised in that: the material returning mechanism (3) comprises a supporting column (31), a torsion spring (32) is sleeved on the surface of the supporting column (31), a fixing column (33) is rotatably connected to the top end of the supporting column (31), a push rod (34) and a bevel gear (35) are respectively welded on the surface of the fixing column (33), the bevel gear (35) is located below the push rod (34), and a bevel rack (36) is welded at the bottom of the upper die base (7).

3. A modular injection mold as claimed in claim 2, wherein: the bottom of the support column (31) is welded and fixed with the top of the lower die holder (1), and the two ends of the torsion spring (32) are clamped and fixed with the fixing column (33) and the inner wall of the lower die holder (1) respectively.

4. A modular injection mold as claimed in claim 1, characterised in that: the fixing mechanism (4) comprises a bidirectional screw (41), a sliding block (42) is connected to the surface of the bidirectional screw (41) in a threaded mode, sliding grooves (43) are formed in the top of the lower die holder (1) and the bottom of the female die (5), a first bevel gear (44) is welded to the surface of the bidirectional screw (41), and a second bevel gear (45) is meshed to the surface of the first bevel gear (44).

5. A modular injection mold according to claim 4, characterized in that: the surface of the bidirectional screw rod (41) is rotationally connected with the inner wall of the fixed plate (2), and the surface of the sliding block (42) is respectively connected with the inner walls of the fixed plate (2) and the sliding groove (43) in a sliding manner.

6. A modular injection mold as claimed in claim 1, characterised in that: unloading mechanism (8) are including stripper (81), unloading spring (82) have been welded to the bottom of stripper (81), depression bar (83) have been welded to the bottom of terrace die (6), notes material hole (84) have been seted up to the inside of depression bar (83), feed port (85) have all been seted up to the inside of depression bar (83), terrace die (6) and upper die base (7), oil filler point (86) have all been seted up to the inside of upper die base (7) and terrace die (6).

7. A modular injection mold according to claim 6, characterised in that: the surface of the discharging plate (81) is in sliding connection with the inner wall of the female die (5), and the bottom end of the discharging spring (82) is welded and fixed with the inner wall of the female die (5).

8. A modular injection mold as claimed in claim 1, characterised in that: protection machanism (9) are including traveller (91), the skin weld of traveller (91) has chuck (92), reset spring (93) have been cup jointed on the surface of traveller (91), oil storage tank (96) have been seted up to the inside of terrace die (6), the inner wall welding of oil storage tank (96) has spacing ring (95), inlet port (94) have been seted up to the inside of traveller (91), passageway (97) have been seted up to the inside of die (5).

9. A modular injection mold as claimed in claim 8, wherein: the bottom of traveller (91) and the top of die (5) contact each other, the surface of traveller (91) and chuck (92) all with the inner wall sliding connection of terrace die (6), the both ends of reset spring (93) respectively with the top of chuck (92) and the inner wall of terrace die (6) contact each other, the surface of traveller (91) and the inner wall sliding connection of spacing ring (95).

10. A method of operating a combined injection mould, the method being based on an injection mould according to any of claims 1-9, characterized in that: the method comprises the following steps:

the method comprises the following steps: the lower die holder (1) is sequentially aligned with the fixing plate (2) and the female die (5), and the sliding blocks (42) respectively enter the sliding grooves (43) of the lower die holder (1) and the female die (5);

step two: the two-way screw (41) rotates and drives the first bevel gear (44) to rotate, the first bevel gear (44) drives the second bevel gear (45) to rotate, the second bevel gear (45) drives the two-way screw (41) to rotate simultaneously, the two sliding blocks (42) move reversely and move into the sliding grooves (43), and the lower die holder (1) and the female die (5) are fixed;

step three: the upper die holder (7) drives the helical rack (36) to move downwards and drives the helical gear (35) to rotate, the helical gear (35) drives the fixing column (33) to rotate clockwise and drives the push rod (34) to rotate together, after die assembly is carried out, the helical rack (36) is separated from the helical gear (35), and the push rod (34) is reset under the action of the torsion spring (32);

step four: the female die (5) is in contact with the male die (6), the sliding column (91) is jacked up by the female die (5), the sliding column (91) drives the reset spring (93) to contract through the chuck (92), meanwhile, the oil inlet hole (94) extends out of the limiting ring (95), oil in the oil storage groove (96) enters the oil inlet hole (94) and permeates into the channel (97), and the oil permeates into the female die (5) from the channel (97);

step five: the upper die holder (7) drives the male die (6) to move downwards and drives the pressure rod (83) to move downwards, the pressure rod (83) pushes the discharging plate (81) to move downwards, the discharging spring (82) in the discharging plate (81) is compressed, injection molding is carried out in the feeding hole (85), and the die is separated after cooling;

step six: the pressing rod (83) moves upwards, the discharging spring (82) drives the discharging plate (81) to move upwards, the discharging plate (81) pushes out a formed product, the upper die base (7) drives the helical rack (36) to move upwards and drives the helical gear (35) to rotate anticlockwise, the helical gear (35) drives the fixing column (33) to drive the push rod (34) to rotate so as to return the product, and after die separation is finished, the push rod (34) is reset by the torsion spring (32).