CN220146588U - Ejection mechanism of injection mold - Google Patents

Abstract

The utility model discloses an ejection mechanism of an injection mold, and belongs to the technical field of injection molds. The ejection mechanism comprises an ejector rod, a top plate and an ejector pin, wherein the top end of the ejector rod penetrates through the lower supporting plate, the top end of the ejector rod is connected with the top plate, and the ejector pin is connected above the top plate; the ejector pin comprises an ejector pin head and an ejector bolt, the bottom of the ejector bolt is connected with the top plate, the ejector pin head is in threaded connection with the top end of the ejector bolt, and the ejector pin head is used for directly contacting a die product and applying ejection force to the die product; the thimble head of thimble has the cross section shape the same with the shaping space cross section, and the thimble head can reciprocate along the shaping space. According to the novel ejection mechanism of the injection mold, disclosed by the utility model, the cross section of the ejector pin for ejecting the mold product covers the whole area inside the lower mold core, so that the mold product can be easily ejected even if the mold product is combined to the mold core through strong adhesion force.

Description

Ejection mechanism of injection mold

Technical Field

The utility model relates to an ejection mechanism of an injection mold, belongs to the technical field of injection molds, and in particular relates to an ejection mechanism of an injection mold of a motor rotor.

Background

Injection Mold (Injection Mold) is a tool for producing a resin article, and is one of important devices in resin processing. Injection molds are typically made of metal materials such as steel and the like, and require several precision machining and heat treatments in their manufacture.

The injection mold works on the principle that resin particles or powder are heated and melted and then injected into a mold cavity in the mold through an injection molding machine. After the resin cools and solidifies, the mold opens and ejects the molded resin article. Injection molds can produce a variety of resin articles of different shapes and sizes, such as various resin housings, containers, parts, toys, and the like.

In the conventional injection molding process, pigments, stabilizers, plasticizers, fillers, etc. are first added to a resin to form a mixture and put into a hopper, and then a heating device is placed just in front of a feed port, which is generally heated by electric heating, high-pressure steam, etc., and after the resin is brought into a molten state, the mixture is injected into a mold by an injection molding machine with a piston, thereby forming a resin product.

Such an injection molding die has a molding space corresponding to the external shape and size of an injection product, and is formed by combining an upper die and a lower die that can be separated from each other, thereby enabling the injection product that can be molded in the molding space to be molded.

In the mold as described above, a plurality of ejector pins are mounted on the lower mold so that the injection product can be ejected out of the mold when the mold is separated.

Specifically, a conventional mold will be described below with reference to fig. 1.

An upper mold 101 is mounted to the bottom of the top plate 102, and the upper mold 101 includes an upper core (not shown); a lower die 104 is arranged above the bottom plate 105, the lower die 104 comprises a lower core 111, pin holes and guide holes are arranged on the lower core 111, the lower die 104 is arranged above the bottom plate 105, limiting blocks 103 are arranged on two sides of the bottom plate 105, and an ejection mechanism is arranged below the lower die 104 and comprises an ejector rod 110, a top plate 108, an ejector pin 106, a reset pin 107 and a reset spring 109; the ejector rod 110 is arranged at the bottom of the top plate 108, the ejector rod 110 penetrates through the bottom plate 105, the top plate 108 is arranged above the bottom plate 105 and between the two limiting blocks 103, reset pins 107 are respectively arranged at four corners above the top plate 108, each reset pin 107 is sleeved with a reset spring 109, and a plurality of ejector pins 106 are arranged in the middle of the upper part of the top plate 108.

With the conventional mold having such a structure as described above, when the ejector pins 110 are raised and lowered after the upper mold 101 and the lower mold 104 are separated, the entire top plate 108 including the ejector pins 106 and the reset pins 107 is lifted upward, and at the same time, the upper ends of the ejector pins 106 protrude from the pin holes on the lower core 111, so that the mold product above the lower core 111 can be pushed out. At this time, the return pin 107 serves to guide the vertical movement of the ejector pin 106, and as the top plate 108 is lifted, the return spring 109 is compressed together, and then an elastic restoring force can be applied to the lifting mechanism.

However, such conventional mold as described above has the following drawbacks.

First, conventional ejector mechanisms are designed to release the molded product by acting on it using ejector pins 106. However, there is a problem in that smaller diameter pins 106 generally cannot generate an ejector force exceeding a certain magnitude.

In other words, it is not so-called whether the shape of the injection molded product is relatively simple and the area of contact with the upper and lower cores is small, but when the shape of the upper and lower cores is complex or the contact area of the injection molded product with the upper and lower cores is large, for example, an insert. When injection molding, the product needs to be separated from the upper core and the lower core, and a strong ejection force is required at this time, if the ejector pins 106 with small (thin) diameters are used, the ejector pins 106 cannot overcome the adhesion force between the product and the mold, and the problem that the ejector pins 106 are bent or broken easily occurs.

Second, the ejector pins, which are connected to only a specific area of the entire bottom area of the mold and eject the mold, do not uniformly apply the ejection force to the entire surface of the mold, as in the conventional mold described above, the ejector pins 106 eject only the four corner areas of the injection mold, and therefore, such an ejector mechanism intensively applies the ejection force only to a specific portion of the mold product, which has problems such as easy bending of the mold product or damage and peeling of the surface coating.

Third, the ejector pins 106 are distributed over the entire surface of the top plate 108, and the ejector pins 110 supporting the top plate 108 are connected to the bottom center of the top plate 108, so that the ejector pins 110 have a strong ejector force when pushing the top plate 108 upward. In this case, the ejector pins mounted above the top plate 108 and away from the ejector pins 110 generate bending moments on the top plate 108, and the opposite ejector pins 106 near the ejector pins 110 generate insignificant bending moments. When the top plate 108 is bent, a non-vertical ejection force exists between the ejector pins 106 and the mold product, but ejection forces in other directions occur (in the case that the top plate 108 is not bent, an ejection force applied by the ejector pins 106 to the mold product is in the vertical direction), so that the injection molded product cannot be ejected uniformly and stably.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a novel ejection mechanism of an injection mold, which comprises the following steps: 1. even if the die product is adhered to the die core by strong adhesive force, the occurrence of bending or fracture of the thimble can be prevented;

2. when demolding is carried out, uniform ejection force can be applied to the surface of the whole mold product, and mold bending or damage and falling of a surface coating are prevented;

3. the top plate is not bent when the ejector pin receives larger ejection force.

The technical problems to be solved by the utility model are realized by adopting the following technical scheme:

an ejection mechanism of an injection mold comprises an upper mold and a lower mold which can be combined and separated from each other, wherein an upper mold core is arranged below the upper mold, a lower mold core is arranged above the lower mold, a molding space for molding the mold is formed between the upper mold and the lower mold, and the lower mold is connected to a lower supporting plate;

the method is characterized in that:

the ejection mechanism comprises an ejector rod, a top plate and an ejector pin, wherein the top end of the ejector rod penetrates through the lower supporting plate, the top end of the ejector rod is connected with the top plate, and the ejector pin is connected above the top plate;

the ejector pin comprises an ejector pin head and an ejector bolt, the bottom of the ejector bolt is connected with the top plate, the ejector pin head is in threaded connection with the top end of the ejector bolt, and the ejector pin head is used for directly contacting a die product and applying ejection force to the die product;

the thimble head of thimble has the cross section shape the same with the shaping space cross section, and the thimble head can reciprocate along the shaping space.

As a preferable example, the thimble further comprises a guide sleeve, wherein the guide sleeve is arranged between the lower end of the thimble head and the upper end of the top plate, an ejection bolt is inserted into the guide sleeve, a guide hole is arranged on the fixing plate, and the top end of the guide sleeve penetrates through the guide hole.

As a preferable example, the lower end of the lower mold core is provided with a lower core step protruding along the circumference, and a lower mold groove into which the lower core step falls is arranged in the lower mold plate.

The beneficial effects of the utility model are as follows:

(1) According to the novel ejection mechanism of the injection mold, disclosed by the utility model, the cross section of the ejector pin for ejecting the mold product covers the whole area inside the lower mold core, so that the mold product can be easily ejected even if the mold product is combined to the mold core through strong adhesive force;

(2) According to the utility model, when the forming die product is ejected, the uniform ejection force is applied to the whole surface of the forming die product, so that the forming die product cannot be bent, and the problem that the coating of the outer layer of the metal material is damaged and falls off cannot occur;

(3) According to the utility model, the ejector pins at the center of the ejector plate are the same as the ejector pins, so that the ejector plate for fixing the ejector pins cannot be bent, and uniform ejection force can be kept on a molding die product all the time.

Drawings

Fig. 1 is a schematic view showing a three-dimensional exploded structure of a conventional mold;

FIG. 2 is a schematic side sectional view of an injection mold with an ejection mechanism according to the present utility model;

FIG. 3 is a schematic side sectional exploded view of a lower die with an ejector mechanism according to the present utility model;

FIG. 4 is a schematic side sectional exploded view of the upper die of the present utility model;

fig. 5 is a schematic view showing a state in which a molding die is mounted in an injection die;

fig. 6 is a schematic view showing a state in which a molding die product is ejected from an injection die.

In the figure: 10. an upper die; 11. an upper template; 12. an upper die groove; 13. an upper mold core; 14. a core-up step; 15. a second round hole; 16. a support hole; 17. an upper core rod groove; 18. an upper core bar; 19. a club head; 20. an upper fixing plate; 30. a lower die; 31. a lower support plate; 32. a cushion block; 33. a fixing plate; 34. a lower template; 35. a lower die groove; 36. a top plate; 37. a bolt head groove; 38. a top plate fixing plate; 39. a return spring; 40. a lower mold core; 41. a lower core step; 43. a support rod; 44. a needle head is propped against; 45. a first round hole; 46. an internal thread; 47. a guide sleeve; 48. ejecting a bolt; 49. an external thread; 50. a push rod; 51. and (5) fastening a bolt.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

The present utility model is to solve the problems in the background art described above, and has the following objects:

first, the objective is to prevent the ejector pins of the ejector mechanism from bending or breaking even if the molded article is bonded to the core by a strong adhesive force.

Second, when ejecting a molded product, the object is to prevent the product from being bent or damaged by applying a uniform ejection force to the entire surface of the molded product.

Third, the object is to prevent the top plate from bending even when a strong ejection force acts on the ejector pin.

Hereinafter, preferred embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

Fig. 2 is a sectional view showing a state where the lower mold portion and the upper mold portion are combined, fig. 3 is an exploded sectional view showing the lower mold portion, and fig. 4 is an exploded sectional view showing the upper mold portion.

The utility model relates to an ejection mechanism of an injection mold, belongs to the technical field of injection molds, and in particular relates to an ejection mechanism of a motor rotor injection mold. The injection mold includes an upper mold 10 and a lower mold 30, and the upper mold 10 and the lower mold 30 may be combined and separated to form a mold product.

First, as shown in fig. 2 and 3, the lower die 30 is placed on the lower support plate 31, and the lower support plate 31 is made of a thick steel plate.

A spacer 32 is fixed to each corner above the lower support plate 31;

the fixing plate 33 is installed at the upper end of the pad 32, and the fixing plate 33 is used for forming a certain interval between the lower support plate 31 and the pad 32;

the lower die plate 34 is connected to the upper end of the fixed plate 33, and forms a space for molding a product when the lower die plate is brought into combined contact with the upper die plate 11.

A top plate 36 which is movable up and down is provided in a space formed between the fixed plate 33 and the lower support plate 31;

the top plate generally consists of a top plate securing plate 38 attached to the lower end of the top plate 36.

In addition, a return spring 39 as a compression spring is connected between the fixed plate 33 and the top plate 36.

The lower die plate 34 separable from the upper die plate 11 is provided with a lower die core 40, a molding space is formed in the lower die core 40, the molding space is used to form a molded product in the form of a motor rotor, and the lower die core 40 has a lower die step 41 provided with a protrusion in a circumferential direction along a lower end thereof, a lower die groove 35 is provided on the lower die plate 34, and the lower die step 41 is seated in the lower die groove 35 so that the lower die core 40 does not come off the lower die plate 34.

In addition, there is no concentric circle between the lower core step 41 and the circumference of the upper portion of the lower mold core 40, so that the lower mold core 40 does not rotate in the lower mold groove 35 in the lower mold plate 34 when the lower mold core 40 is connected to the lower mold plate 34.

The lower die plate 34 is provided at each corner with a circular rod-shaped supporting bar 43 protruding upward, and a supporting hole 16 allowing the supporting bar 43 to be inserted therein is correspondingly formed at the bottom of the upper die plate 11.

In addition, the fixing plate 33 is installed at the lower end of the lower mold plate 34 such that the lower mold core 40 does not fall to the lower end. The fixing plate 33 is connected to the lower mold plate 34 by bolts, and the fixing plate 33 is made of a wide steel plate so as to entirely cover the lower end of the lower mold core 40.

As another embodiment for fixing the lower mold core 40 and the lower mold plate 34, the lower mold core 40 is connected to the lower mold plate 34 by using small fixing screws, in which case there is no need to provide the fixing plate 33 at the lower end of the lower mold core 40. The lower mold core 40 is directly fixed by the fixing screw without using the fixing plate 33 additionally. Therefore, this approach has the advantages of low material cost and simple installation work.

However, if the force pressing the lower mold core 40 from above exceeds a certain level, a small fixing bolt on only one side of the lower mold core 40 is difficult to withstand, and thus the fixing plate 33 needs to be used because of its large supporting area.

Inside the lower core 40, a tip pin 44 having the same cross-sectional shape as the molding space is inserted, and the tip pin 44 moves up and down along the molding space formed in the lower core 40. The top needle 44 itself is formed with a first circular hole 45 extending therethrough from top to bottom. An internal thread 46 that can be coupled with a thread 49 of an ejector bolt 48 is formed at the lower end of the first circular hole 45.

A hollow columnar guide sleeve 47 penetrating the fixing plate 33 is provided between the lower end of the ejector pin head 44 and the upper end of the top plate 36, and the inner diameter of the guide sleeve 47 is the same as the diameter of the ejector bolt 48.

An ejector bolt 48 is provided in the guide sleeve 47, a bolt head groove 37 for fixing the head of the ejector bolt 48 is provided in the top plate 36, an external thread 49 is formed on the top of the ejector bolt 48, and the external thread 49 is connected to the internal thread 46 of the ejector pin 44.

The bolt heads of the ejector bolts 48 are seated in the bolt head grooves 37 formed on the top plate 36, and the bottoms of the bolt head grooves 37 are completely covered by the top plate fixing plate, thereby completely fixing the ejector bolts 48 to the top plate 36.

The ejector 50 is provided at the lower end of the top plate fixing plate 38, and the ejector 50 passes through a circular hole formed in the lower support plate 31.

The lower die plate 34, the fixing plate 33, the spacer 32 and the lower support plate 31 described above are fixed by a single fastening bolt 51. In fixing the components, each component may be fixed separately, in addition to combining the entire components into one component, and other fixing means other than bolting may be used.

As described above, the lower die 30 has been described in detail, and the configuration of the upper die 10 placed on the lower die 30 will be described below.

The upper mold plate 11 and the lower mold plate 34 are combined together to form a molding space, the upper mold plate 11 has an upper mold core 13, the upper mold core 13 has a molding space for molding an injection molded product in the form of a motor rotor, and the upper mold core 13 is connected to the upper mold plate 11 in the same manner that the lower mold core 40 is fixed to the lower mold plate 34.

Accordingly, at the lower end of the upper core 13, an upper core step 14 is circumferentially provided, or bolt holes capable of bolting are formed.

A supporting hole 16 is formed at a corner of the upper die plate 11 to be concave inward so that a supporting rod 43 formed at a corner of the lower die 34 can be inserted.

A second circular hole 15 is formed at the center of the upper core 13, which penetrates from top to bottom, and a head 19 of an upper core rod 18 is located at the upper end of the second circular hole 15.

An upper core bar 18 having an outer diameter equal to the inner diameter of the second round hole 15 is inserted into the second round hole 15, and an upper core bar groove 17 is formed at an upper end portion of the upper core bar 18 and is used for mounting a head 19.

In the present embodiment, the upper die plate 11 and the upper fixing plate 20 are coupled by bolting, but may be coupled by other fixing means.

Although not shown in the present utility model, a runner (not shown) and a gate (not shown) that guide the injection molding material into the molding space should also be included in the injection mold, and these devices are known devices, and only the description and illustration are omitted.

With reference to fig. 5 and 6, a separation operation of an injection molding die according to the present utility model to manufacture a molded product and a completed molded product is described. Fig. 5 is a diagram showing a state in which a molded product is mounted on an injection mold, and fig. 6 is a schematic diagram showing a state in which a molded product mounted on an injection mold is ejected.

The motor rotor S is inserted into the lower mold core 40, and the mold is assembled by inserting the upper core bar 18 into a groove formed in the center of the motor rotor S. When the molds are combined, a molding space is formed between the upper mold core 13 and the lower mold core 40, the motor rotor S, and the ejector pin head 44.

Molten resin of the injection molding machine is injected into the molding space through a runner and a gate (not shown).

As described above, after a certain time elapses after the molten resin is injected into the molding space, the molten resin is gradually solidified and a molded product is formed.

The molded product is a molded insulator structure that surrounds the entire surface of the motor rotor S, and the coil and the motor rotor S are insulated by molding an insulator around the motor rotor S.

When the molded product (i.e., the motor rotor S) is moved to the outside, the upper mold 10 is separated from the lower mold 30. The motor rotor S is fitted inside the lower mold core 40 of the separated lower mold 30.

At this time, when the hydraulically driven ejector pins 50 are driven and moved upward, the top plate 36 fixed on top of the ejector pins 50 is simultaneously lifted, and therefore, the jacking mechanism fixed on the top plate 36 is lifted, and the ejector bolts 48 and the guide bush 47 are also lifted together.

When the ejector bolt 48 and the guide bush 7 are lifted upward, the ejector pin head 44 at the top is also pushed upward, and thus the molded product placed on the ejector pin head 44, that is, the motor rotor S is pushed out.

When the molded product is ejected out of the mold in this way, the operator takes out the molded product, and the hydraulic pressure applied to the bottom jack 50 is released.

When the hydraulic pressure is released, the top plate 36 is lowered by the elastic restoring force of the compression return spring 39 located between the top plate 36 and the fixed plate 33, and thus the top needle 44 is also lowered.

Then, the operator inserts a new motor rotor S into the lower mold core 40, and then repeats the above-described operation so far.

In the vertical movement of the ejector pin head 44, when the ejector pin head 44 is lifted up, it is lifted up by the guide sleeve 47 and the ejector bolt 48, but when the ejector pin head 44 is lowered down, the ejector pin head 44 is lifted down by the ejector bolt 48.

The reason for using the guide bush 47 in addition to the ejector bolt 48 at the same time when ascending in this way is that the guide bush 47 can apply a larger force to the ejector pin 44 when the ejector pin 44 ascends. Stronger forces are distributed to the ejector bolt 48 and the guide sleeve 47 to reduce the load applied to the ejector pin head 44 per unit area, and thus overload of the ejector pin head 44 can be avoided.

As described above, the ejection mechanism of the injection mold of the present utility model functions as follows:

first, even if the molded product is bonded to the core by a strong adhesive force, since the ejector pin for ejecting the molded product moves up and down in the entire area inside the lower core, the molded product is easily ejected to the outside.

Second, an ejection force is uniformly applied to the entire surface of the molded product at the time of ejecting the molded product so that the molded product is not bent or a coating layer coated on a metal material is not peeled off when the molded product is ejected to the outside.

Third, since one ejector pin is used in the center of the top plate (at the same position as the ejector pin) to eject the molded product, the top plate holding the ejector pin is not bent and the molded product can always be ejected uniformly.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, unless specifically defined otherwise.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art within the scope of the utility model, which is defined by the claims and their equivalents.

Claims (3)

1. An ejection mechanism of an injection mold, wherein the injection mold comprises an upper mold (10) and a lower mold (30) which can be combined and separated from each other, an upper mold core (13) is arranged below the upper mold (10), a lower mold core (40) is arranged above the lower mold (30), a molding space for molding the mold is formed between the upper mold (10) and the lower mold (30), and the lower mold (30) is connected to a lower supporting plate (31);

the method is characterized in that:

the ejection mechanism comprises an ejector rod (50), a top plate (36) and an ejector pin, wherein the top end of the ejector rod (50) penetrates through the lower supporting plate (31), the top end of the ejector rod (50) is connected with the top plate (36), and the ejector pin is connected above the top plate (36);

the ejector pin comprises an ejector pin head (44) and an ejector bolt (48), wherein the bottom of the ejector bolt (48) is connected with the top plate (36), the ejector pin head (44) is in threaded connection with the top end of the ejector bolt (48), and the ejector pin head (44) is used for directly contacting a die product and applying ejector force to the die product;

the thimble head (44) of the thimble has the same cross section shape as the cross section of the molding space, and the thimble head (44) can move up and down along the molding space.

2. The ejection mechanism of the injection mold according to claim 1, wherein the ejector pin further comprises a guide sleeve (47) and a fixing plate (33), the guide sleeve (47) is arranged between the lower end of the ejector pin head (44) and the upper end of the top plate (36), an ejection bolt (48) is inserted into the guide sleeve (47), a guide hole is formed in the fixing plate (33), and the top end of the guide sleeve (47) penetrates through the guide hole.

3. The ejection mechanism of an injection mold according to claim 1, wherein the lower mold (30) comprises a lower mold plate (34), a lower core step (41) protruding along the circumference is arranged at the lower end of the lower mold core (40), and a lower mold groove (35) into which the lower core step (41) falls is arranged in the lower mold plate (34).