Connecting rod core-pulling assembly for mold machining

Abstract

The invention provides a connecting rod core-pulling assembly for mold machining, and relates to the field of injection molds. A movable mold seat is arranged on the top end surface of the mounting base; an upper die base is arranged on the top end face of the movable die base. Four injection molding grooves are formed in the bottom end face of the upper mold base in a rectangular array shape. The top end face of the mounting base is fixedly connected with four fixing bases in a rectangular array shape. The four fixing seats are of rectangular block structures; the movable mold base is slidably connected to the outer sides of the four fixing bases. In the core pulling process, the arc-shaped rack can drive the control gear to rotate along with sliding of the core pulling sliding base, at the moment, the core pulling piece can be pulled to conduct small-amplitude reciprocating sliding through a series of transmission along with rotation of the fixed rotating shaft, and the problem that due to the fact that a plastic part and a core pulling block are tightly attached before core pulling, the plastic part cannot be tightly attached to the core pulling block is solved. The problem that the plastic part is bent, deformed or cracked in the core pulling process due to local stress concentration caused by hard separation of the core pulling block in the pulling process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a connecting rod core-pulling component used for mold processing. Background Art

[0002] During the processing of plastic parts using injection molds, since plastic parts often have non-axial structures such as side holes and side recesses, in order to prevent these structures from getting stuck in the plastic parts during demolding, workers usually use connecting rod core pulling assemblies to first pull the cores that form these complex structures out of the plastic parts when opening the mold, eliminating demolding obstacles and ensuring smooth removal of the plastic parts. Existing connecting rod core pulling assemblies usually consist of a core, a control slider and a connecting rod.

[0003] For example: The utility model with application number CN202420723585.9 discloses a double-link linkage core-pulling mold structure, which specifically includes a core-pulling structure, wherein the core-pulling structure includes a driving structure and two execution structures, wherein the driving structure includes a guide block, and the execution structure includes a fixedly connected core and a slider, and the slider and the guide block are connected by a connecting rod, one end of the connecting rod is rotatably connected to the slider, and the other end is rotatably connected to the guide block; in this application, the transmission from the driving structure to the execution structure is realized by a rotatably connected connecting rod, so that the installation direction of the driving structure does not need to be parallel to or coincide with the moving direction of the execution structure, so that a single driving structure can drive two execution structures to move at the same time, thereby avoiding the interference problem that may be caused by the existence of multiple driving structures.

[0004] However, the existing connecting rod core pulling assembly usually performs core pulling by direct pulling during the core pulling process. However, when performing core pulling on plastic parts with bent tubes or curved corners, since the plastic part is tightly fitted with the core pulling block before the core pulling, the core pulling block is easily separated from the core pulling block during the pulling process, resulting in local stress concentration, causing the plastic part to bend, deform or crack during the core pulling process, causing damage to the plastic, affecting the molding quality of the plastic part, and being inconvenient to use. Summary of the Invention

[0005] In view of this, the present invention provides a connecting rod core pulling assembly for mold processing, which has a core pulling component that releases the internal stress of the plastic part in layers during the core pulling process by reciprocating pulling. During the mold opening process, the second push rod is first started to drive the upper mold base to open the mold. As the upper mold base is opened, the locking block is disengaged from the locking groove. As the locking block is disengaged, the limit on the core pulling slide is released. Then, the first push rod is started to open the movable mold base. As the movable mold base is opened, the guide slide is released in the guide slide groove. Perform reverse sliding, and the reverse sliding of the guide slide column will cause the core-pulling slide to slide in the sliding arc groove in the reverse direction, and the core-pulling part will be pulled out of the injection molding groove for core pulling. In the process of core pulling, the reverse sliding of the core-pulling slide will cause the arc-shaped rack to drive the control gear to rotate in the reverse direction. At this time, as the fixed shaft rotates, the locking pawl will drive the locking ratchet to rotate, and as the locking ratchet rotates, the rotating frame will be driven to rotate. As the rotating frame rotates, the core-pulling part will be pulled through the control connecting rod to perform a small reciprocating sliding.

[0006] The present invention provides a purpose and function of a connecting rod core pulling assembly for mold processing, which specifically includes: a mounting base; a movable mold seat is provided on the top surface of the mounting base; an upper mold seat is provided on the top surface of the movable mold seat; four injection grooves are provided on the bottom surface of the upper mold seat in a rectangular array; four fixed seats are fixedly connected to the top surface of the mounting base in a rectangular array; the four fixed seats are all rectangular block structures; the movable mold seat is slidably connected to the outside of the four fixed seats; four positioning grooves are provided on the bottom surface of the upper mold seat in a rectangular array; the four positioning grooves are all rectangular groove structures; the four positioning grooves are respectively connected to the four fixed seats The position of the seat is aligned; the top surface of the movable mold seat is provided with four molding cavities in a rectangular array; the four molding cavities are respectively aligned with the positions of the four injection grooves; four rotating columns are rotatably connected in a rectangular array in the mounting base; the four rotating columns are respectively arranged in the four molding cavities; the upper part of the four rotating columns is provided with molding grooves; the four molding grooves are respectively aligned with the positions of the four injection grooves; the four rotating columns are fixedly connected with a fixed column; four sliding arc grooves are provided in the upper mold seat in a rectangular array; the four sliding arc grooves are respectively aligned with the positions of the four molding cavities; a core-pulling slide is slidably connected in the four sliding arc grooves.

[0007] Furthermore, the outside of the mounting base is symmetrically bolted with two first push rods; the two first push rods are respectively arranged on the left and right sides of the mounting base; the ends of the first push rod output shafts are fixedly connected to the outside of the movable mold base; an injection channel is opened in the upper mold base; the ends of the injection channel are respectively arranged in four injection grooves.

[0008] Furthermore, the outside of the mounting base is symmetrically bolted with two second push rods; the two second push rods are respectively arranged on the front and rear sides of the mounting base; and the ends of the two second push rods are fixedly connected to the outside of the upper mold base.

[0009] Furthermore, the inner sides of the four core-pulling slides are slidably connected to core-pulling parts; the outer sides of the four core-pulling slides are fixedly connected to a guide slide; a guide slot is opened in each of the four fixed seats; and the four guide slides are slidably connected in the four guide slots respectively.

[0010] Furthermore, a locking groove is provided on the top surface of each of the four sliding arc grooves; the bottom surface of the upper mold base is fixedly connected with four locking blocks in a rectangular array; the four locking blocks are respectively aligned with the positions of the four locking grooves; and the four locking blocks are respectively inserted into the four locking grooves.

[0011] Furthermore, each of the four core-pulling slides is rotatably connected to a fixed rotating shaft; the lower part of the four sliding arc grooves is fixedly connected to an arc-shaped rack; the four core-pulling slides are respectively slidably connected to the outside of the four arc-shaped racks; the outside of the four fixed rotating shafts is coaxially fixedly connected to a control gear; the four control gears are respectively engaged with the four arc-shaped racks.

[0012] Furthermore, the outside of the four fixed shafts are symmetrically hinged with a group of locking pawls; the four core-pulling slides are rotatably connected with a group of locking ratchets; the four groups of locking ratchets are respectively engaged with the four groups of locking pawls; and the four groups of locking ratchets are respectively aligned with the positions of the four control gears.

[0013] Furthermore, the outsides of the four groups of locking ratchets are coaxially fixedly connected to a group of rotating frames; the ends of the four groups of rotating frames are hingedly connected to a group of control links; the ends of the two groups of control links are respectively hingedly connected to the outsides of the four core-pulling parts.

[0014] Furthermore, a transmission shaft is rotatably connected in the center of the mounting base; a transmission gear is coaxially fixedly connected to the outside of the transmission shaft; and the transmission gear is arranged in the mounting base.

[0015] Furthermore, the outside of the transmission gear is meshed with four auxiliary gears in a circular array; the four auxiliary gears are coaxially fixedly connected to the outside of the four rotating columns; the top surfaces of the four fixed columns are fixedly connected with threaded forming columns; the four threaded forming columns are aligned with the positions of the four forming cavities respectively.

[0016] Beneficial effects

[0017] The present invention can realize that the core pulling part is pulled back and forth in a small range by the arc rack as the core pulling slide seat slides and the control gear rotates. At this time, the core pulling part is pulled back and forth in a small range by a series of transmission pulls as the fixed rotating shaft rotates. The reciprocating sliding of the core pulling part can make the core pulling part be pulled back and forth in the injection molded part in a small range, and the internal stress of the plastic part can be released layer by layer through the reciprocating extraction, thereby avoiding deformation and cracking of the plastic part during the core pulling process. At the same time, the reciprocating extraction of the core pulling part can reduce the fitting tightness between the plastic part and the core pulling part, thereby improving the stability of the demoulding action. The reciprocating extraction of the core pulling part can also reduce the structural blocking resistance, reduce the resistance during core pulling, reduce the wear of the core pulling part, effectively improve the convenience of the connecting rod core pulling assembly, and make it more convenient to use.

[0018] During the rotation of the fixed shaft, due to the self-locking characteristics between the locking ratchet and the locking pawl, the rotation of the fixed shaft during the mold closing process will not drive the locking ratchet to rotate through the locking pawl. Only during the mold opening process, as the fixed shaft rotates, the locking pawl will drive the locking ratchet to rotate, ensuring that the cavity is completely closed during mold closing, ensuring the molding size accuracy and shape consistency of the plastic parts, ensuring the molding quality of the injection molded parts, and effectively improving the practicality of the connecting rod core pulling assembly.

[0019] During the mold opening process, the transmission shaft is driven to rotate by an external drive motor, and then the transmission gear drives the four auxiliary gears to rotate. The rotation of the four auxiliary gears will drive the rotating column to rotate. As the rotating column rotates, the fixed column and the molding groove are driven to rotate. When the fixed column rotates, the threaded molding column is also driven to rotate. Then, the threaded portion of the injection molded part is demoulded by the rotation of the molding groove and the threaded molding column, thereby ensuring the demoulding effect of the threaded portion of the plastic part, preventing the threaded portion of the plastic part from being damaged during the demoulding process, and further improving the practicality of the connecting rod core pulling assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0021] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0022] In the attached figure:

[0023] Figure 1 It is an axonometric structural diagram of the present invention.

[0024] Figure 2It is a schematic cross-sectional structural diagram of the upper die base of the present invention.

[0025] Figure 3 It is a schematic diagram of the axonometric structure of the molding cavity of the present invention.

[0026] Figure 4 It is a schematic cross-sectional structural diagram of the movable die seat of the present invention.

[0027] Figure 5 It is a schematic diagram of the axonometric structure of the sliding arc groove of the present invention.

[0028] Figure 6 It is a schematic diagram of the axonometric structure of the fixing seat of the present invention.

[0029] Figure 7 It is a schematic cross-sectional structural diagram of the core-pulling slide of the present invention.

[0030] Figure 8 It is a schematic diagram of the axonometric structure of the fixed rotating shaft of the present invention.

[0031] Figure 9 It is a schematic cross-sectional structural diagram of the mounting base of the present invention.

[0032] Figure 10 This invention Figure 9 A is an enlarged structural diagram of FIG.

[0033] Reference Signs List

[0034] 1. Mounting base; 101. Moving mold base; 102. Upper mold base; 103. First push rod; 104. Second push rod; 105. Injection channel; 106. Injection groove; 107. Locking block; 108. Molding cavity; 109. Locking groove; 110. Fixed seat; 111. Positioning groove; 112. Sliding arc groove; 113. Core-pulling slide; 114. Core-pulling part; 115. Guide slide; 116. Guide slide column; 117. Arc rack; 118. Fixed shaft; 119. Locking pawl; 120. Locking ratchet; 121. Control gear; 122. Rotating frame; 123. Control connecting rod; 124. Transmission shaft; 125. Transmission gear; 126. Rotating column; 127. Auxiliary gear; 128. Fixed column; 129. Molding groove; 130. Threaded molding column. DETAILED DESCRIPTION

[0035] Example 1:

[0036] The present invention provides a connecting rod core pulling assembly for mold processing, please refer to Figures 1 to 10 As shown, it includes: a mounting base 1;

[0037] The top surface of the mounting base 1 is provided with a movable mold seat 101; the top surface of the movable mold seat 101 is provided with an upper mold seat 102; the bottom surface of the upper mold seat 102 is provided with four injection grooves 106 in a rectangular array; the top surface of the mounting base 1 is fixedly connected with four fixed seats 110 in a rectangular array; the four fixed seats 110 are all rectangular block structures; the movable mold seat 101 is slidably connected to the outside of the four fixed seats 110; the bottom surface of the upper mold seat 102 is provided with four positioning grooves 111 in a rectangular array; the four positioning grooves 111 are all rectangular groove structures; the four positioning grooves 111 are respectively aligned with the positions of the four fixed seats 110; the top surface of the movable mold seat 101 is provided with Four molding cavities 108; the four molding cavities 108 are aligned with the positions of the four injection molding grooves 106 respectively; four rotating columns 126 are rotatably connected in a rectangular array in the mounting base 1; the four rotating columns 126 are respectively arranged in the four molding cavities 108; the upper part of the four rotating columns 126 is provided with a molding groove 129; the four molding grooves 129 are aligned with the positions of the four injection molding grooves 106 respectively; the four rotating columns 126 are fixedly connected with a fixed column 128; four sliding arc grooves 112 are provided in a rectangular array in the upper mold base 102; the four sliding arc grooves 112 are aligned with the positions of the four molding cavities 108 respectively; a core-pulling slide 113 is slidably connected in the four sliding arc grooves 112.

[0038] Among them, two first push rods 103 are symmetrically bolted to the outside of the mounting base 1; the two first push rods 103 are respectively arranged on the left and right sides of the mounting base 1; the ends of the output shafts of the first push rods 103 are fixedly connected to the outside of the movable mold base 101; an injection channel 105 is opened in the upper mold base 102; the ends of the injection channel 105 are respectively arranged in four injection grooves 106.

[0039] Among them, two second push rods 104 are symmetrically bolted to the outside of the mounting base 1; the two second push rods 104 are respectively arranged on the front and back sides of the mounting base 1; the ends of the two second push rods 104 are fixedly connected to the outside of the upper mold base 102.

[0040] Among them, the inner sides of the four core-pulling slides 113 are slidably connected to the core-pulling parts 114; the outer sides of the four core-pulling slides 113 are fixedly connected to a guide slide 116; a guide slot 115 is opened in each of the four fixed seats 110; and the four guide slides 116 are slidably connected in the four guide slots 115 respectively.

[0041] Among them, the top end surface of the four sliding arc grooves 112 is provided with a locking groove 109; the bottom end surface of the upper mold base 102 is fixedly connected with four locking blocks 107 in a rectangular array; the four locking blocks 107 are respectively aligned with the positions of the four locking grooves 109; the four locking blocks 107 are respectively inserted into the four locking grooves 109.

[0042] Among them, each of the four core-pulling slides 113 is rotatably connected to a fixed rotating shaft 118; the lower part of the four sliding arc grooves 112 is fixedly connected to an arc-shaped rack 117; the four core-pulling slides 113 are respectively slidably connected to the outside of the four arc-shaped racks 117; the outside of the four fixed rotating shafts 118 is coaxially fixedly connected to a control gear 121; the four control gears 121 are respectively engaged with the four arc-shaped racks 117.

[0043] Among them, the outside of the four fixed rotating shafts 118 are symmetrically hinged with a group of locking pawls 119; the four core-pulling slides 113 are rotatably connected with a group of locking ratchets 120; the four groups of locking ratchets 120 are respectively engaged with the four groups of locking pawls 119; the four groups of locking ratchets 120 are respectively aligned with the positions of the four control gears 121.

[0044] Among them, the outside of the four groups of locking ratchets 120 are coaxially fixedly connected to a group of rotating frames 122; the ends of the four groups of rotating frames 122 are hingedly connected to a group of control links 123; the ends of the two groups of control links 123 are respectively hingedly connected to the outside of the four core-pulling parts 114.

[0045] The specific use and role of the embodiment are as follows: in the embodiment, the first push rod 103 is arranged to drive the movable die seat 101 to move, thereby controlling the opening and closing of the movable die seat 101; the second push rod 104 is arranged to drive the upper die seat 102 to move, thereby controlling the opening and closing of the upper die seat 102; after the upper die seat 102 and the movable die seat 101 are both closed, the molten plastic is injected into the injection molding groove 106 through the injection channel 105, so that the plastic is injected and molded in the injection molding groove 106, the forming cavity 108 and the forming groove 129; during the closing process of the upper die seat 102, the guide slide column 116 slides in the guide slide groove 115, the core pulling slide 113 slides along the sliding arc groove 112 as the guide slide column 116 slides, the core pulling piece 114 is slowly extended as the core pulling slide 113 slides, thereby forming the injection molded part; after the upper die seat 102 is closed, the second push rod 104 is started to close the upper die seat 102; during the closing process of the upper die seat 102, the locking block 107 is slowly inserted into the locking groove 109; after the upper die seat 102 is closed, the locking block 107 is completely inserted into the locking groove 109, at this time, the locking block 107 abuts against the outside of the core pulling slide 113 to limit the position of the core pulling slide 113, thereby ensuring the forming effect of the injection molded part; during the sliding process of the core pulling slide 113 in the sliding arc groove 112, the core pulling slide 113 also slides along the arc gear rack 117, at this time, the arc gear rack 117 drives the control gear 121 meshed therewith to rotate, the fixed rotating shaft 118 is driven to rotate as the control gear 121 rotates; the locking ratchet wheel 120 and the locking ratchet pawl 119 are connected by a torsion spring, which is prior art and will not be described in detail; during the rotation of the fixed rotating shaft 118, the locking ratchet wheel 120 is not driven to rotate by the locking ratchet pawl 119 due to the self-locking characteristic between the locking ratchet wheel 120 and the locking ratchet pawl 119 during the closing process of the upper die seat 102; only during the opening process of the upper die seat 102, the locking ratchet wheel 120 is driven to rotate by the locking ratchet pawl 119 as the fixed rotating shaft 118 rotates; during the opening process of the upper die seat 102, the second push rod 104 is started to drive the upper die seat 102 to open, the locking block 107 is separated from the locking groove 109 as the upper die seat 102 opens, the position of the core pulling slide 113 is released as the locking block 107 separates, then the first push rod 103 is started to drive the movable die seat 101 to open, the guide slide column 116 reversely slides in the guide slide groove 115 as the movable die seat 101 moves, the core pulling slide 113 reversely slides in the sliding arc groove 112 as the guide slide column 116 reversely slides, the core pulling piece 114 is pulled out of the injection molding groove 106 to perform core pulling, during the core pulling process,As the core-pulling slide 113 slides in the opposite direction, the arc-shaped rack 117 drives the control gear 121 to rotate in the opposite direction. At this time, as the fixed shaft 118 rotates, the locking pawl 119 drives the locking ratchet 120 to rotate. As the locking ratchet 120 rotates, the rotating frame 122 rotates. As the rotating frame 122 rotates, the core-pulling member 114 is pulled through the control link 123 to slide back and forth slightly.

[0046] Example 2:

[0047] Based on Example 1, please refer to Figure 1 and Figure 9 As shown, it includes: a transmission shaft 124, a transmission gear 125, an auxiliary gear 127 and a threaded forming column 130. A transmission shaft 124 is centrally connected to the mounting base 1 for rotation; a transmission gear 125 is coaxially fixedly connected to the outside of the transmission shaft 124; the transmission gear 125 is arranged in the mounting base 1.

[0048] Among them, the outside of the transmission gear 125 is in a ring array and engages with four auxiliary gears 127; the four auxiliary gears 127 are coaxially fixedly connected to the outside of the four rotating columns 126; the top surfaces of the four fixed columns 128 are fixedly connected with threaded forming columns 130; the four threaded forming columns 130 are respectively aligned with the positions of the four forming cavities 108.

[0049] Specific usage and function of this embodiment: In the present invention, the transmission shaft 124 is connected to the external drive motor. During the mold opening process, the transmission shaft 124 is driven to rotate by the external drive motor. As the transmission shaft 124 rotates, the transmission gear 125 is driven to rotate. During the rotation of the transmission gear 125, the four auxiliary gears 127 are driven to rotate. The rotation of the four auxiliary gears 127 drives the rotating column 126 to rotate. As the rotating column 126 rotates, the fixed column 128 and the molding groove 129 are driven to rotate. When the fixed column 128 rotates, the threaded molding column 130 is also driven to rotate, and the threaded part of the injection molded part is demolded by the rotation of the molding groove 129 and the threaded molding column 130.

[0050] In this article, there are several points to note:

[0051] 1. The drawings of this embodiment only involve the structures related to this embodiment. Other structures can refer to the general design.

[0052] 2. In the absence of conflict, the features of this embodiment and the embodiments can be combined with each other to obtain new embodiments.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A connecting rod core pulling assembly for mold processing, comprising: The mounting base (1) is provided with a movable mold seat (101) on the top surface of the mounting base (1); the upper mold seat (102) is provided with an upper mold seat (102) on the top surface of the movable mold seat (101); the bottom surface of the upper mold seat (102) is provided with four injection grooves (106) in a rectangular array; the top surface of the mounting base (1) is fixedly connected with four fixed seats (110) in a rectangular array; the four fixed seats (110) are all rectangular block structures; the movable mold seat (101) is slidably connected to the outside of the four fixed seats (110); the bottom surface of the upper mold seat (102) is provided with four positioning grooves (111) in a rectangular array; the four positioning grooves (111) are all rectangular groove structures; the four positioning grooves (111) are respectively aligned with the positions of the four fixed seats (110); the top surface of the movable mold seat (101) is in a rectangular array Four molding cavities (108) are provided; the four molding cavities (108) are aligned with the positions of the four injection molding grooves (106) respectively; four rotating columns (126) are rotatably connected in a rectangular array in the mounting base (1); the four rotating columns (126) are respectively arranged in the four molding cavities (108); the upper parts of the four rotating columns (126) are provided with molding grooves (129); the four molding grooves (129) are aligned with the positions of the four injection molding grooves (106) respectively; the four rotating columns (126) are fixedly connected with a fixed column (128); the upper mold base (102) is provided with four sliding arc grooves (112) in a rectangular array; the four sliding arc grooves (112) are aligned with the positions of the four molding cavities (108) respectively; and a core-pulling slide (113) is slidably connected in the four sliding arc grooves (112).

2. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: The mounting base (1) is symmetrically bolted with two first push rods (103) on the outside; the two first push rods (103) are respectively arranged on the left and right sides of the mounting base (1); the ends of the output shafts of the first push rods (103) are fixedly connected to the outside of the movable mold base (101); an injection channel (105) is opened in the upper mold base (102); the ends of the injection channel (105) are respectively arranged in the four injection grooves (106).

3. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: The outside of the mounting base (1) is symmetrically bolted with two second push rods (104); the two second push rods (104) are respectively arranged on the front and rear sides of the mounting base (1); and the ends of the two second push rods (104) are fixedly connected to the outside of the upper die base (102).

4. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: The inner sides of the four core-pulling slides (113) are all slidably connected to core-pulling pieces (114); the outer sides of the four core-pulling slides (113) are all fixedly connected to a guide slide (116); a guide slot (115) is provided in each of the four fixed seats (110); and the four guide slides (116) are respectively slidably connected in the four guide slots (115).

5. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: The top end surfaces of the four sliding arc grooves (112) are each provided with a locking groove (109); the bottom end surface of the upper die base (102) is fixedly connected with four locking blocks (107) in a rectangular array; the four locking blocks (107) are respectively aligned with the positions of the four locking grooves (109); and the four locking blocks (107) are respectively inserted into the four locking grooves (109).

6. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: The four core-pulling slides (113) are rotatably connected to a fixed shaft (118); the lower parts of the four sliding arc grooves (112) are fixedly connected to an arc-shaped rack (117); the four core-pulling slides (113) are respectively slidably connected to the outside of the four arc-shaped racks (117); the outside of the four fixed shafts (118) are coaxially fixedly connected to a control gear (121); the four control gears (121) are respectively engaged with the four arc-shaped racks (117).

7. A connecting rod core pulling assembly for mold processing according to claim 6, characterized in that: The four fixed shafts (118) are symmetrically hinged on the outside with a group of locking pawls (119); the four core-pulling slides (113) are rotatably connected with a group of locking ratchets (120); the four groups of locking ratchets (120) are respectively engaged with the four groups of locking pawls (119); and the four groups of locking ratchets (120) are respectively aligned with the positions of the four control gears (121).

8. A connecting rod core pulling assembly for mold processing according to claim 7, characterized in that: The exteriors of the four groups of locking ratchets (120) are coaxially fixedly connected to a group of rotating frames (122); the ends of the four groups of rotating frames (122) are hingedly connected to a group of control connecting rods (123); and the ends of the two groups of control connecting rods (123) are hingedly connected to the exteriors of the four core-pulling parts (114).

9. A connecting rod core pulling assembly for mold processing according to claim 1, characterized in that: A transmission shaft (124) is rotatably connected in the center of the mounting base (1); a transmission gear (125) is coaxially fixedly connected to the outside of the transmission shaft (124); and the transmission gear (125) is arranged in the mounting base (1).

10. A connecting rod core pulling assembly for mold processing according to claim 9, characterized in that: The outside of the transmission gear (125) is meshed with four auxiliary gears (127) in a ring array; the four auxiliary gears (127) are coaxially fixedly connected to the outside of the four rotating columns (126); the top surfaces of the four fixed columns (128) are fixedly connected to threaded molding columns (130); the four threaded molding columns (130) are aligned with the positions of the four molding cavities (108).

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