Compression-molding injection mold and injection-molding process

Abstract

The application discloses a compression molding injection mold and an injection molding process. The injection mold comprises a mold base and a mold cover arranged on the mold base. A plurality of mold cavities are arranged along the circumference of the mold base. A plurality of mold plates matched with the mold cavities are arranged along the circumferential direction of the mold cover, and the mold plates can move to compress the mold cavities. The mold base comprises a movable mold and a rotating core plate. The movable mold and the rotating core plate are detachably connected. The mold cavities are arranged on the movable mold. The rotating core plate is arranged between the movable mold and the mold cover. The injection mold can avoid appearance problems such as concave, shrinkage mark, internal bubble and internal cavity by means of layer-by-layer stacking or core-injection molding. The compression molding is applied to the primary molding process, the residual stress after the primary molding can be reduced, the shrinkage of the primary injection molding can be compressed, and the overall molding cycle can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to a compression molding injection mold and an injection molding process. BACKGROUND

[0002] Injection molded parts are generally divided into two categories: thin-walled parts and thick-walled parts. With the traditional single-layer injection molding method, the thickness of the injection molded part increases, and the molding cycle also increases, making the product injection molding extremely difficult. Moreover, the product molded once has residual stress, and the traditional solution is to increase the protection pressure and holding time to achieve compensation, but this method still results in a large residual stress and prolongs the overall molding cycle. Moreover, the single-layer injection molding method produces appearance problems such as concave, shrinkage marks, internal bubbles, and internal cavities. Therefore, there is an urgent need for an injection mold that can reduce residual stress, reduce the overall molding cycle, and solve the above appearance problems such as concave, shrinkage marks, internal bubbles, and internal cavities. SUMMARY

[0003] The present application proposes a compression molding injection mold and an injection molding process to solve the above problems and needs. The technical features adopted can achieve the above technical purposes and bring other technical effects.

[0004] One object of the present application is to provide a compression molding injection mold. The injection mold comprises a mold base and a mold cover arranged on the mold base. A plurality of mold cavities are arranged along the circumference of the mold base, and the volume of the mold cavities increases along the circumferential direction. A plurality of mold plates are arranged along the circumferential direction of the mold cover and cooperate with the mold cavities. The mold plates can compress the mold cavities.

[0005] The mold base comprises a movable mold and a core plate. The movable mold and the core plate are detachably connected. The mold cavities are formed on the movable mold, and the core plate is located between the movable mold and the mold cover.

[0006] In the technical scheme, when the injection mold is used for injection molding, the mold cover is arranged on the mold base to make the injection mold in a closed mold state and injection molding is performed on the first mold cavity of the injection mold to form a primary product; then the mold cover and the mold base are adjusted to move towards each other to make the mold cover move to compress the primary product; then the mold cover is adjusted from the closed mold state to an open mold state, the core plate is lifted to make the core plate separate from the movable mold, and then the core plate is rotated to make the product rotate synchronously with the core plate to the second mold cavity; then the core plate is lowered to make the core plate fit with the movable mold, and then the mold cover and the mold base are adjusted from the open mold state to the closed mold state, injection molding is performed on the primary product in the second mold cavity of the injection mold to form a secondary product; the mold cover and the mold base are continuously adjusted to move towards each other to make the mold cover move to compress the secondary product; finally, the above steps are repeated to perform multiple injection moldings to form multiple products until the injection molding is completed. The injection mold forms the product by means of layer-by-layer stacking or core-in-sheath injection molding, and can avoid appearance problems such as recess, shrink mark, internal bubble and internal cavity. The compression molding is applied to the primary molding process, the residual stress after the primary molding can be reduced, the shrinkage of the primary injection molding can be compressed, and the purpose of reducing the overall molding cycle can be achieved.

[0007] In addition, the compression molding injection mold according to the present application can further have the following technical features.

[0008] In an example of the present application, the mold plate can move between a first position and a second position for compressing the mold cavity, wherein the mold plate seals the mold cavity in both the first position and the second position, and the volume of the mold cavity when the mold plate is in the first position is greater than the volume of the mold cavity when the mold plate is in the second position.

[0009] In an example of the present application, the movable mold has a mold table, and the core plate has a through hole corresponding to the mold table, wherein the mold cavity is formed on the mold table.

[0010] In an example of the present application, the core plate has a mounting hole,

[0011] The injection mold further comprises:

[0012] The core mounting plate is fixedly connected in the mounting hole and fixedly connected with the connecting rod of the injection molding machine.

[0013] The mounting hole is formed through the core plate at a position corresponding to the connecting rod.

[0014] In an example of the present application, the movable mold has a through hole, the through hole is coaxially arranged with the mounting hole, and the inner diameter of the through hole is greater than the outer diameter of the connecting rod.

[0015] In one example of the present application, the rotating core mounting plate comprises a main body portion and an extension portion extending from an outer side wall of the main body portion in a radial direction away from the main body portion; wherein the mounting hole corresponding to the rotating core mounting plate comprises a first hole portion and a second hole portion in sequence, and the first hole portion is adapted to the main body portion, and the second hole portion is adapted to the extension portion.

[0016] In one example of the present application,

[0017] The rotating core mounting plate and the rotating core plate are connected by fasteners;

[0018] A plurality of first positioning holes are formed on the rotating core mounting plate;

[0019] A plurality of second positioning holes corresponding to the first positioning holes are formed on the rotating core plate;

[0020] The fasteners are sequentially arranged in the first positioning holes and the second positioning holes.

[0021] In one example of the present application,

[0022] The rotating core mounting plate and the connecting rod are connected by a threaded connection;

[0023] A threaded hole is formed on the rotating core mounting plate;

[0024] An external thread is formed on an outer peripheral wall of the connecting rod and is adapted to the threaded hole.

[0025] In one example of the present application,

[0026] A positioning hole is formed along an axial direction of the threaded hole;

[0027] A protrusion is formed along an axial direction of the connecting rod and is adapted to the positioning hole.

[0028] Another object of the present application is to provide an injection molding process of the compression molding injection mold as described above, comprising the following steps:

[0029] S10: covering the mold cover on the mold base to place the injection mold in a closed mold state and injecting the first mold cavity of the injection mold to form a primary product;

[0030] S20: adjusting the relative movement between the mold cover and the mold base to make the mold cover move to compress the primary product;

[0031] S30: adjusting the mold cover from the closed mold state to the open mold state, lifting the rotating core plate to separate the rotating core plate from the moving mold, and then rotating the rotating core plate to make the product rotate synchronously to the second mold cavity;

[0032] S40: Lowering the rotating core plate so that the rotating core plate is attached to the movable mold, and then adjusting the mold cover and the mold base from the mold opening state to the mold closing state, and injecting the secondary product into the first product in the second mold cavity of the injection mold to form the secondary product;

[0033] S50: Repeating S30 to S40 to form multiple injection molded products to complete the injection molded product.

[0034] The most preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings, so that the features and advantages of the present application can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below. The drawings are only used to show some embodiments of the present application, and the present application is not limited to the drawings.

[0036] Figure 1 It is a front view of a compression molding injection mold according to an embodiment of the present application;

[0037] Figure 2 It is an exploded view of the compression molding injection mold according to an embodiment of the present application in one direction;

[0038] Figure 3 It is an exploded view of the compression molding injection mold according to an embodiment of the present application in another direction;

[0039] Figure 4 It is an exploded view of the compression molding injection mold according to an embodiment of the present application in another direction;

[0040] Figure 5 It is a structural schematic diagram of the connection of the compression molding injection mold and the connecting rod according to an embodiment of the present application;

[0041] Figure 6 It is a flowchart of the injection molding process of the compression molding injection mold according to an embodiment of the present application.

[0042] LIST OF REFERENCE NUMBERS:

[0043] Injection mold 100;

[0044] Mold base 110;

[0045] Movable mold 111;

[0046] Mold table 1111;

[0047] Mold cavity 1112;

[0048] Through hole 1113;

[0049] core plate 112;

[0050] through hole 1121;

[0051] mounting hole 1122;

[0052] first hole portion 11221;

[0053] second hole portion 11222;

[0054] mold cover 120;

[0055] mold plate 121;

[0056] link 130;

[0057] projection 131;

[0058] core mounting plate 140;

[0059] main body portion 141;

[0060] extension portion 142;

[0061] threaded hole 143;

[0062] fitting hole 144. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the technical solutions of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0064] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms, as used herein, do not imply any order, quantity, or importance, but are used to identify various components. Also, the terms "a" and "an" do not limit the quantity to one but rather mean "one or more". The terms "including", "comprising", and similar terms mean that the components or objects listed after the term are included, but not limited to, the components or objects recited. The terms "connected" and "coupled" are not restricted to direct connections or couplings, but can include indirect connections or couplings through other components or objects. The terms "upper", "lower", "left", "right", and similar terms are used to describe relative positions of the components or objects, and the relative positions can change when the absolute positions of the components or objects are changed.

[0065] According to a first aspect of the present application, a compression molding injection mold 100 is provided, as shown in the accompanying drawings, the injection mold 100 comprises a mold base 110 and a mold cover 120 arranged on the mold base 110, wherein a plurality of mold cavities 1112 are formed along the circumferential direction of the mold base 110, and the volumes of the mold cavities 1112 increase sequentially along the circumferential direction, a plurality of mold plates 121 are formed along the circumferential direction of the mold cover 120 and are matched with the mold cavities 1112, and the mold plates 121 are capable of performing a compression movement on the mold cavities 1112. Figures 1 to 5

[0066] The mold base 110 comprises a movable mold 111 and a core plate 112, the movable mold 111 is detachably connected with the core plate 112, the mold cavities 1112 are formed on the movable mold 111, and the core plate 112 is located between the movable mold 111 and the mold cover 120.

[0067] ​In the injection molding using the injection mold 100, the mold cover 120 is first covered on the mold base 110 to make the injection mold 100 in a closed mold state and to perform injection molding on the first mold cavity 1112 to form a primary product; then the mold cover 120 is adjusted to move towards the mold base 110 to make the mold cover 120 move to compress the primary product; then the mold cover 120 is adjusted from the closed mold state to the open mold state, the core plate 112 is lifted to make the core plate 112 separate from the movable mold 111, and then the core plate 112 is rotated to make the product rotate synchronously to the second mold cavity 1112; then the core plate 112 is lowered to make the core plate 112 fit with the movable mold 111, and then the mold cover 120 is adjusted from the open mold state to the closed mold state between the mold cover 120 and the mold base 110, and injection molding is performed on the primary product in the second mold cavity 1112 of the injection mold 100 to form a secondary product; finally, the above steps are repeated to perform multiple injection moldings to form multiple products until the injection molding is completed. The injection mold 100 forms the product by means of layer-by-layer stacking or core-injection molding, which can avoid appearance problems such as recess, shrink mark, internal bubble, internal cavity, etc., and can reduce the residual stress of the product after primary molding by applying compression molding to the primary molding process, and can compensate for the shrinkage of the primary injection molding by compression, thereby achieving the purpose of reducing the overall molding cycle.

[0068] It can be understood that the mold cavity 1112 is provided with an injection port connected with an external injection machine, and the injection liquid flows into the mold cavity through the flow channel to perform injection molding; the injection mold 100 is installed on the injection machine, and the movement between the mold base 110 and the mold cover 120 is realized by the injection machine, for example, a connecting rod is arranged on the injection machine to realize the movement of the injection mold.

[0069] In an example of the present application, the mold plate 121 can move between a first position and a second position for compressing the mold cavity 1112, wherein the mold plate 121 seals the mold cavity 1112 in both the first position and the second position, and the volume of the mold cavity 1112 when the mold plate 121 is in the first position is greater than the volume of the mold cavity 1112 when the mold plate 121 is in the second position.

[0070] In a specific embodiment of the present application, the mold plate 121 compresses the mold cavity 1112 once, i.e. from the first position to the second position, which can reduce the residual stress of the product after primary molding and compensate for the shrinkage of the primary injection molding by compression, thereby achieving the purpose of reducing the overall molding cycle.

[0071] In an example of the present application, the movable mold 111 has a mold table 1111, and the core plate 112 has a through hole 1121 matched with the mold table 1111, wherein the mold cavity 1112 is formed on the mold table 1111.

[0072] That is, in the specific injection molding process, the mold cavity 1112 on the mold table 1111 cooperates with the mold plate 121, and the presence of the core plate 112 is to facilitate the rotation of the mold 111 cover, that is, from the position of one of the mold cavities 1112 to the position of the other mold cavity 1112, through the above structure, the cover plate can be compressed The mold cavity 1112, and the core plate 112 drives the mold 111 cover to rotate.

[0073] In an example of the present application, the core plate 112 is provided with a mounting hole 1122,

[0074] The injection mold 100 further comprises:

[0075] The core mounting plate 140 is fixedly connected in the mounting hole 1122 and fixedly connected with the connecting rod 130.

[0076] Among them, the mounting hole 1122 is throughly provided on the core plate 112 and corresponds to the position of the connecting rod 130.

[0077] When using the injection mold 100, first, place the injection mold 100 on the injection molding machine, so that the connecting rod 130 of the injection molding machine is opposite to the through hole 1121 of the movable mold 111; Then disassemble the core mounting plate 140 on the core plate 112, and lift the connecting rod 130 to make it pass through the through hole 1121 and the mounting hole 1122 in turn and protrude from the core plate 112; Then the core mounting plate 140 is fixedly connected with the connecting rod 130, and the connecting rod 130 is lowered to make the core mounting plate 140 fit in the mounting hole 1122; Finally, the core mounting plate 140 is fixedly connected with the core plate 112, and the core plate 112 is separated from the movable mold 111; By setting the core mounting plate 140, the connection between the connecting rod 130 and the core plate 112 can be facilitated, the assembly is simple, the step of lifting the core plate 112 is omitted, and the installation time is greatly saved and the installation efficiency is greatly improved.

[0078] In an example of the present application, the inner diameter of the mounting hole 1122 is greater than the outer diameter of the connecting rod 130;

[0079] That is, in order to further facilitate the connection between the connecting rod 130 and the core mounting plate 140, the connecting rod 130 needs to be lifted to protrude from the core plate 112, so that by making the inner diameter of the mounting hole 1122 greater than the outer diameter of the connecting rod 130, the connecting rod 130 can be conveniently passed through the mounting hole 1122.

[0080] In one example of the present application, the rotating core mounting plate 140 comprises a main body portion 141 and an extension portion 142 extending from the outer side wall of the main body portion 141 in a direction away from the main body portion 141; wherein the mounting hole 1122 corresponding to the rotating core mounting plate 140 comprises a first hole portion 11221 and a second hole portion 11222 which are sequentially communicated, and the first hole portion 11221 is adapted to the main body portion 141, and the second hole portion 11222 is adapted to the extension portion 142;

[0081] In other words, the mounting hole 1122 is a stepped hole, and the inner diameter of the first hole portion 11221 is smaller than the inner diameter of the second hole portion 11222, and correspondingly, the rotating core mounting plate 140 also has a stepped structure, and the stepped mounting hole 1122 can facilitate the assembly of the rotating core mounting plate 140 and the rotating core plate 112.

[0082] In one example of the present application, the movable die 111 is provided with a through hole 1113 coaxially arranged with the mounting hole 1122, and the inner diameter of the through hole 1113 is larger than the outer diameter of the connecting rod 130;

[0083] The through hole 1113 is arranged in a gap with the connecting rod 130, and the presence of the through hole 1113 can facilitate the connection of the connecting rod 130 and the rotating core mounting plate 140, that is, the connecting rod 130 is arranged to pass through the through hole 1113 to the mounting hole 1122 and is fixedly connected with the rotating core mounting plate 140.

[0084] In one example of the present application,

[0085] The rotating core mounting plate 140 and the rotating core plate 112 are connected by fasteners;

[0086] The rotating core mounting plate 140 is provided with a plurality of first positioning holes;

[0087] The rotating core plate 112 is provided with a plurality of second positioning holes corresponding to the first positioning holes one by one;

[0088] The fasteners sequentially pass through the first positioning holes and the second positioning holes;

[0089] The above fastener connection can more reliably connect the rotating core mounting plate 140 and the rotating core plate 112 together, and is convenient to disassemble.

[0090] In one example of the present application,

[0091] The rotating core mounting plate 140 and the connecting rod 130 are connected by threads;

[0092] The rotating core mounting plate 140 is provided with a threaded hole 143;

[0093] The outer peripheral wall of the connecting rod 130 is provided with an outer thread matched with the threaded hole 143;

[0094] The above connection method is simpler, more convenient and has high reliability.

[0095] In one example of the present application,

[0096] The matching hole 144 is formed along the axial direction of the threaded hole 143;

[0097] The protrusion 131 matched with the matching hole 144 is formed along the axial direction of the connecting rod 130;

[0098] The matching hole 144 and the protrusion 131 can facilitate the centering cooperation between the connecting rod 130 and the threaded hole 143.

[0099] In one example of the present application, the matching hole 144 is coaxially arranged with the protrusion 131;

[0100] In one example of the present application, the matching hole 144 is further provided with a sealing ring configured to seal the gap between the protrusion 131 and the matching hole 144;

[0101] Since the water-oil pipeline is arranged in the connecting rod 130, the sealing ring can effectively seal the gap between the protrusion 131 and the matching hole 144.

[0102] According to the second aspect of the present application, an injection molding process of the compression molding injection mold 100 is as follows, Figure 6 As shown, the process comprises the following steps:

[0103] S10: Covering the mold cover 120 on the mold base 110 to make the injection mold 100 in a closed mold state and injecting the first mold cavity 1112 of the injection mold 100 to form a primary product;

[0104] S20: Adjusting the relative movement between the mold cover 120 and the mold base 110 to make the mold cover 120 move to compress the primary product;

[0105] S30: Adjusting the mold cover 120 from the closed mold state to the open mold state, lifting the rotating core plate 112 to make the rotating core plate 112 separate from the movable mold 111, and then rotating the rotating core plate 112 to make the product rotate synchronously to the second mold cavity 1112;

[0106] S40: the descending core plate 112 is fitted with the movable mold 111, and then the mold cover 120 is adjusted from the open mold state to the closed mold state between the mold base 110, and the primary product in the second mold cavity 1112 of the injection mold 100 is injection molded to form a secondary product;

[0107] S50: repeating S30 to S40 to perform multiple injection molding to form multiple products until the injection molding product is completed.

[0108] It should be noted that the mold cavity 1112 cooperates with the mold cover 120 to form a sealed injection mold cavity 1112, and the volume of the mold cavity 1112 increases in the circumferential direction, and the volume of the first mold cavity 1112 is smaller than that of the second mold cavity 1112, and so on.

[0109] The first mold cavity 1112 of the injection mold 100 is injection molded by the injection molding machine, and after the primary product is formed, the mold cover 120 is adjusted to move towards the mold base 110 so that the mold cover 120 moves to compress the primary product; the injection mold 100 is opened at this time, and the primary product is left on one side of the core plate 112 and the movable mold 111, and then the core plate 112 is lifted by the connecting rod 130, so that the core plate 112 is connected to the primary product and separated from the movable mold 111, and then the connecting rod 130 is rotated to transfer the primary product from the first mold cavity 1112 to the second mold cavity 1112 for the second injection molding; that is, the compression is only performed in the first mold cavity 1112 in the injection molding process, and the product is formed after multiple injection moldings, and the injection molding process forms the product by layering or core injection molding, which can avoid appearance problems such as concave, shrinkage mark, internal bubble, internal cavity, etc., and can reduce the residual stress of the product after primary molding, and can compensate for the shrinkage of the primary injection molding by compression, thereby achieving the purpose of reducing the overall molding cycle.

[0110] The above describes the exemplary embodiments of the compression molding injection mold and injection molding process in detail with reference to the preferred embodiments, however, those skilled in the art can understand that various modifications and improvements can be made to the above specific embodiments without departing from the concept of the present application, and various technical features and structures of the present application can be combined without exceeding the protection scope of the present application, and the protection scope of the present application is determined by the appended claims.

Claims

1. An injection molding process for compression-molding injection molds, characterized in that, The compression molding injection mold comprises a mold base (110) and a mold cover (120) arranged on the mold base (110), wherein a plurality of mold cavities (1112) are arranged along the circumference of the mold base (110), and the volumes of the mold cavities (1112) increase in sequence along the circumferential direction, a plurality of mold plates (121) matched with the mold cavities (1112) are formed along the circumferential direction of the mold cover (120), and the mold plates (121) can move to compress the mold cavities (1112); The mold base (110) comprises a movable mold (111) and a rotating core plate (112), the movable mold (111) is detachably connected with the rotating core plate (112), the mold cavities (1112) are formed on the movable mold (111), and the rotating core plate (112) is located between the movable mold (111) and the mold cover (120); The mold plates (121) can move between a first position and a second position to compress the mold cavities (1112), wherein the mold plates (121) seal the mold cavities (1112) in both the first position and the second position, and the volume of the mold cavities (1112) when the mold plates (121) are in the first position is greater than the volume of the mold cavities (1112) when the mold plates (121) are in the second position; The movable mold (111) has a mold table (1111), the rotating core plate (112) has a through hole (1121) matched with the mold table (1111), and the mold cavities (1112) are formed on the mold table (1111); The injection molding process comprises the following steps: S10: arranging the mold cover (120) on the mold base (110) to make the injection mold (100) in a closed mold state and injecting the first mold cavity (1112) of the injection mold (100) to form a primary product; S20: adjusting the relative movement between the mold cover (120) and the mold base (110) to make the mold cover (120) move to compress the primary product; S30: adjusting the mold cover (120) from the closed mold state to an open mold state, lifting the rotating core plate (112) to make the rotating core plate (112) separate from the movable mold (111), and then rotating the rotating core plate (112) to make the product rotate synchronously to the second mold cavity (1112); S40: lowering the rotating core plate (112) to make the rotating core plate (112) fit the movable mold (111), and then adjusting the mold cover (120) and the mold base (110) from the open mold state to the closed mold state, and injecting the primary product in the second mold cavity (1112) of the injection mold (100) to form a secondary product; S50: repeating S30 to S40 to perform multiple injection molding to form multiple products until the injection molding is completed.

2. The injection molding process of the compression molding injection mold according to claim 1, wherein the injection mold further comprises: a rotating core mounting plate (140) fixedly connected in the mounting hole (1122) and fixedly connected with a connecting rod (130) of an injection molding machine. ​ A mounting hole (1122) is formed through the rotating core plate (112) at a position corresponding to the connecting rod (130).

3. The injection molding process of the compression molding injection mold according to claim 2, characterized in that, A through hole (1113) is formed through the movable mold (111), the through hole (1113) is coaxially arranged with the mounting hole (1122), and the inner diameter of the through hole (1113) is larger than the outer diameter of the connecting rod (130).

4. The injection molding process of the compression molding injection mold according to claim 2, characterized in that, The rotating core mounting plate (140) includes a main body portion (141) and an extension portion (142) extending away from the main body portion (141) in a radial direction; the mounting hole (1122) corresponding to the rotating core mounting plate (140) includes a first hole portion (11221) and a second hole portion (11222) connected in sequence, and the first hole portion (11221) is matched with the main body portion (141), and the second hole portion (11222) is matched with the extension portion (142).

5. The injection molding process of the compression molding injection mold according to claim 2, characterized in that, The rotating core mounting plate (140) and the rotating core plate (112) are connected by a fastener; A plurality of first positioning holes are formed in the rotating core mounting plate (140); A plurality of second positioning holes corresponding to the first positioning holes are formed in the rotating core plate (112); The fastener passes through the first positioning hole and the second positioning hole in sequence.

6. The injection molding process of the compression molding injection mold according to claim 2, characterized in that, The rotating core mounting plate (140) and the connecting rod (130) are connected by a threaded connection; A threaded hole (143) is formed in the rotating core mounting plate (140); An external thread is formed in the outer peripheral wall of the connecting rod (130) and matched with the threaded hole (143).

7. The injection molding process of the compression molding injection mold according to claim 6, characterized in that, An adapter hole (144) is formed in the axial direction of the threaded hole (143); A protrusion (131) matched with the adapter hole (144) is formed in the axial direction of the connecting rod (130).

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