Mold opening and closing device with central mold locking function for plastic product forming machine

Abstract

The invention discloses a mold opening and closing device with a central mold locking function for a plastic product forming machine. The plastic product forming machine comprises a base, an upper pull rod is connected between the opposite sides of the upper ends of the left pull arm and the right pull arm, and a lower pull rod is connected between the opposite sides of the lower ends of the left pull arm and the right pull arm; the bottoms of the left and right mold frames and the base form a sliding pair respectively; the center position of the right side of the right mold frame is fixed with the middle part of the left side of the right pull arm; the mold opening and closing device comprises a swing arm connecting frame, a dead point overrunning self-locking mechanism and a pair of synchronizing mechanisms, the upper portion of the left side of the swing arm connecting frame is fixed to the middle of the right side of the left pull arm, the bottom of the swing arm connecting frame and the base form a sliding pair, and the dead point overrunning self-locking mechanism is connected between the upper portion of the right side of the swing arm connecting frame and the center of the left side of the left mold frame. And the pair of synchronizing mechanisms is arranged on the base at the position between the swing arm connecting frame and the lower end of the left mold frame. The mold locking device has the advantages that dead point mold locking can be realized to generate strong self-locking force, so that the quality of a plastic product is ensured; energy consumption is saved, and oil leakage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plastic product forming machines, and particularly relates to a mold opening and closing device with a center locking function for a plastic product forming machine. BACKGROUND

[0002] The aforementioned plastic products include hollow and non-hollow plastic products. The former, i.e. hollow plastic products, are various plastic containers, stacking barrels, IBC ton barrels and water tanks, etc. The latter, i.e. non-hollow plastic products, are plastic covers, sealing rings, automotive interior parts, door panels, vehicle body floor panels and protective panels, charging pile housings, subway interior panels, vehicle engine fans, etc.

[0003] A plastic product forming machine completes one mold opening and closing action for each formed workpiece. For this purpose, see CN101890772A (mold opening and closing mechanism), CN101890850A (magnetic mold closing device for hollow plastic product forming machine), CN102357948A (elbow type mold opening and closing mechanism), CN103522528A (horizontal mold closing mechanism for blow molding) and CN103587109A (mold locking device for hollow plastic product forming machine), etc.

[0004] As known in the industry, the larger the volume of the plastic workpiece to be formed, the greater the oil cylinder stroke of the mold opening and closing mechanism structure system, and after the two half-molds (i.e. left and right half-molds or front and rear half-molds) facing each other are closed in place, they need to be locked by sufficient locking force to ensure the quality of the plastic product. If the plastic product is hollow, a visible mold closing seam or flash will be left on the product in the case of insufficient locking force, which needs to be deburred (i.e. "flash removal") manually or by machine. If the plastic product is non-hollow, the parting surface will be spread apart, creating a gap as an abnormal exhaust or pressure relief passage, the melt fills the wall cavity, and the injection pressure will leak to the outside through the gap, resulting in incomplete products due to lack of material.

[0005] As known from the above description, the quality of the plastic product will be affected by the locking effect, and the direct action of the locking force on the center of the mold can to some extent avoid the deformation of the mold frame (also known as "mold plate") due to eccentric moment (Gorelin column bending), product flash, and leakage of material to the outside.

[0006] The prior art opening and closing mold device generally has the following technical problems: first, the structure system of the locking mechanism does not have a strong self-locking force when passing the dead point, thus failing to meet the expected locking requirements; second, it does not have energy saving effect, because during the pressure maintaining stage (also called "pressure maintaining period") after locking, the locking oil cylinder still needs to continuously maintain high pressure pump operation as the hydraulic machine, thus increasing energy consumption; third, it cannot meet the clean production requirements, because the use of hydraulic oil cylinder locking cannot avoid oil leakage, affecting the environment of the operation site, and also increasing the use cost and affecting the working efficiency of the plastic product forming machine due to the need to replace the hydraulic oil from time to time in the shutdown state; fourth, the rigid connection of the plastic product forming machine is relatively weak and the wear of the moving parts is relatively serious. Based on the foregoing factors, it is necessary to improve, and the technical solution to be introduced below is generated in this background. SUMMARY

[0007] The task of the present application is to provide a plastic product forming machine with a center locking function opening and closing mold device which helps the relevant components of the structure system of the locking mechanism to generate a strong self-locking force when passing the dead point, is conducive to abandoning the traditional design mode of hydraulic cylinder locking, significantly reduces energy consumption, avoids oil leakage, embodies clean production, and is beneficial to ensuring the ideal uniformity of the locking force and eliminating problems such as die frame deformation caused by eccentric torque.

[0008] The task of the present application is accomplished in the following way: a plastic product forming machine with a center locking function opening and closing mold device, the plastic product forming machine comprising a base, a left pull arm corresponding to the upper left end of the base and a right pull arm corresponding to the upper right end of the base and opposite to the left pull arm, an upper pull rod connected between the opposite sides of the upper ends of the left and right pull arms, and a lower pull rod connected between the opposite sides of the lower ends of the left and right pull arms and at a position corresponding to the lower side of the upper pull rod, the upper and lower pull rods being parallel to each other, a left die frame and a right die frame, the bottoms of the left and right die frames each forming a sliding pair with the base, and the right side center position of the right die frame being fixed with the left side middle part of the height direction of the right pull arm in height; the opening and closing mold device with a center locking function comprises a swing arm connecting frame, a dead point overrunning self-locking mechanism, and a pair of synchronization mechanisms, the left side upper part of the swing arm connecting frame being fixed with the right side middle part of the height direction of the left pull arm, and the bottom forming a sliding pair with the base, the dead point overrunning self-locking mechanism being connected between the right side upper part of the swing arm connecting frame and the left side center position of the left die frame, and the pair of synchronization mechanisms being arranged on the base at a position between the swing arm connecting frame and the lower end of the left die frame and connected with the lower end of the swing arm connecting frame and the lower end of the left die frame.

[0009] In one specific embodiment of the present application, the base comprises a front bottom beam, a rear bottom beam, a left connecting cross beam, a right connecting cross beam and a set of middle connecting cross beams, the front bottom beam and the rear bottom beam are parallel to each other in the length direction, a front guide rail is fixed to the upper part of the front bottom beam in the length direction, and a rear guide rail is fixed to the upper part of the rear bottom beam in the length direction, the left connecting cross beam is fixed between the left end of the front and rear bottom beams, the right connecting cross beam is fixed between the right end of the front and rear bottom beams, and the set of middle connecting cross beams are fixed between the middle part of the front and rear bottom beams; the bottom of the left and right mold frames and the swing arm connecting frame forms a sliding pair with the front and rear guide rails; the synchronous mechanism is arranged on the upper part of one of the middle connecting cross beams corresponding to the right side of the swing arm connecting frame.

[0010] In another specific embodiment of the present application, a pair of swing arm connecting frame hinged ears are formed on the right side of the swing arm connecting frame, a bearing accommodating hole is formed on each of the pair of swing arm connecting frame hinged ears, and a left mold frame hinged seat is fixed to the left side center position of the left mold frame; the dead point overrunning self-locking mechanism is connected between the pair of swing arm connecting frame hinged ears and the left mold frame hinged seat.

[0011] In yet another specific embodiment of the present application, the dead point overrunning self-locking mechanism comprises a motor, a speed reducer, a swing arm, a pull arm and a pair of bearings, the motor is fixed to the front side of the speed reducer in a horizontal state and is in transmission cooperation with the speed reducer, the speed reducer shaft of the speed reducer faces the rear, the pair of bearings are arranged in the bearing accommodating holes on the pair of swing arm connecting frame hinged ears, the left end of the swing arm is inserted between the pair of swing arm connecting frame hinged ears, a swing arm transmission connection hole is formed on the left end of the swing arm, a flat key groove is formed on the hole arm of the swing arm transmission connection hole, the swing arm transmission connection hole corresponds to the bearing inner ring hole of the pair of bearings, a pair of swing arm shaft seats corresponding to each other in the front and rear positions are formed on the right end of the swing arm, a pull arm hinged shaft hole corresponding to each other in the front and rear positions is formed on each of the pair of swing arm shaft seats, the left end of the pull arm is inserted between the pair of swing arm shaft seats and is hinged to the pair of swing arm shaft seats through the pull arm left hinged shaft provided with a pull arm left hinged shaft bearing, and the right end of the pull arm is hinged to the left mold frame hinged seat through the pull arm right hinged shaft provided with a pull arm right hinged shaft bearing, the speed reducer shaft of the speed reducer cooperates with the bearing inner ring hole, a flat key is formed on the speed reducer shaft and at a position corresponding to the flat key groove, and the flat key is fixed in key cooperation with the flat key groove.

[0012] In still another specific embodiment of the present application, the left mold frame hinged seat is fixed on a left mold frame hinged seat cover plate, and the left mold frame hinged seat cover plate is fixed to the left side center position of the left mold frame; the motor is a servo motor with forward and reverse rotation functions.

[0013] In still another specific embodiment of the present application, a left pull arm threaded head is formed at the left end of the pull arm, a right pull arm threaded head is formed at the right end of the pull arm, a left pull arm hinged shaft connector is threadedly connected to the left pull arm threaded head, a left pull arm hinged shaft hole is formed at the left end of the left pull arm hinged shaft connector, a right pull arm hinged shaft connector is threadedly connected to the right pull arm threaded head, a right pull arm hinged shaft hole is formed at the right end of the right pull arm hinged shaft connector, the left pull arm hinged shaft is hinged to the pair of swing arm shaft seats at the position corresponding to the left pull arm hinged shaft hole, and the right pull arm hinged shaft is hinged to the left die frame hinged seat at the position corresponding to the right pull arm hinged shaft hole.

[0014] In still another specific embodiment of the present application, a right die frame cover plate is fixed at the middle right side of the right die frame, and a right pull arm connecting seat is fixed at the middle left side of the right pull arm in the height direction, and the right die frame and the right pull arm are fixed by the right die frame cover plate and the right pull arm connecting seat through fasteners; a swing arm connecting frame cover plate is fixed at the upper left side of the swing arm connecting frame, and the upper part of the swing arm connecting frame and the left pull arm are fixed through the swing arm connecting frame cover plate and the middle right side of the left pull arm in the height direction.

[0015] In still another specific embodiment of the present application, a pair of left die frame legs are extended at the lower part of the left die frame and at the positions corresponding to the front and rear bottom beams, and a pair of left die frame sliders are respectively fixed at the bottom of the pair of left die frame legs and at the positions corresponding to the front and rear guide rails; a pair of right die frame legs are extended at the lower part of the right die frame and at the positions corresponding to the front and rear bottom beams, and a pair of right die frame sliders are respectively fixed at the bottom of the pair of right die frame legs and at the positions corresponding to the front and rear guide rails; a pair of swing arm connecting frame sliders are respectively fixed at the bottom of the swing arm connecting frame and at the positions corresponding to the front and rear bottom beams; the pair of left die frame sliders, the pair of right die frame sliders, and the pair of swing arm connecting frame sliders form sliding pairs with the front and rear guide rails.

[0016] In still another specific embodiment of the present application, the left pull arm and the right pull arm are inclined, and the inclination direction is from back to front from top to bottom.

[0017] In still another specific embodiment of the present application, in the pair of synchronization mechanisms, the synchronization mechanism located at the rear is identical in structure to the synchronization mechanism located at the front, and the pair of synchronization mechanisms are connected in opposite directions between the swing arm connecting frame and the left mold frame, the synchronization mechanism located at the front comprises a synchronization gear seat, a synchronization gear, a left mold frame synchronization pull rod and a swing arm connecting frame synchronization pull rod, the synchronization gear seat is fixed to the upper portion of the corresponding one of the set of intermediate connecting crossbeams to the right of the swing arm connecting frame, the synchronization gear seat has a synchronization gear accommodating cavity, a left mold frame synchronization pull rod rack corresponding hole is formed in the front cavity wall of the synchronization gear accommodating cavity, and a swing arm connecting frame synchronization pull rod rack corresponding hole is formed in the rear cavity wall and at the position corresponding to the left mold frame synchronization pull rod rack corresponding hole, a synchronization gear shaft lower shaft head pivot support hole is formed in the bottom wall of the synchronization gear accommodating cavity, a synchronization gear accommodating cavity cover is fixed to the top of the synchronization gear accommodating cavity, a synchronization gear shaft upper shaft head pivot support hole is formed in the central portion of the synchronization gear accommodating cavity cover and at the position corresponding to the synchronization gear shaft lower shaft head pivot support hole, the synchronization gear is rotatably arranged in the synchronization gear accommodating cavity and the front side and the rear side of the synchronization gear correspond to the left mold frame synchronization pull rod rack corresponding hole and the swing arm connecting frame synchronization pull rod rack corresponding hole respectively, the synchronization gear shaft lower shaft head of the synchronization gear is rotatably supported on the synchronization gear shaft lower shaft head pivot support hole, and the synchronization gear shaft upper shaft head of the synchronization gear is rotatably supported on the synchronization gear shaft upper shaft head pivot support hole, the right end of the left mold frame synchronization pull rod is fixedly connected to the lower end of the left mold frame, and the right end of the left mold frame synchronization pull rod extends to the left side of the synchronization gear seat through the synchronization gear seat and is formed with a left mold frame synchronization pull rod rack on the side facing the synchronization gear accommodating cavity, the swing arm connecting frame synchronization pull rod is located at the rear side of the left mold frame synchronization pull rod, the left end of the swing arm connecting frame synchronization pull rod is fixed to the lower portion of the arm connecting frame, and the right end of the swing arm connecting frame synchronization pull rod extends to the right side of the synchronization gear seat through the synchronization gear seat and is formed with a swing arm connecting frame synchronization pull rod rack on the side facing the synchronization gear accommodating cavity, and the synchronization gear is simultaneously engaged with the left mold frame synchronization pull rod rack and the swing arm connecting frame synchronization pull rod rack at the positions corresponding to the left mold frame synchronization pull rod rack corresponding hole and the swing arm connecting frame synchronization pull rod rack corresponding hole at the same time.

[0018] The technical effect of the technical scheme provided by the present application is that: because the dead point overrunning self-locking mechanism is adopted in the structure system of the mold opening and closing device with the center locking function, the dead point locking can be realized to generate strong self-locking force, and the quality of the plastic products is ensured; because only a small force is needed to ensure the locking during the dead point locking and pressure maintaining stage, the high pressure oil pump does not need to be continuously operated to meet the oil cylinder pressure as using the oil cylinder, so that the energy consumption is significantly saved, and the clean production is realized by avoiding the oil leakage; because the center locking can fully ensure the ideal uniformity of the locking force, the problems such as the deformation of the mold frame caused by the eccentric moment are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure diagram of the embodiment of the present application is shown in the figure. Figure 2 The detailed structure diagram of the dead point overrunning self-locking mechanism is shown in the figure. Figure 1 Figure 3 The preferred embodiment diagram of the pull arm of the structure system of the dead point overrunning self-locking mechanism is shown in the figure. Figure 1 Figure 4 The detailed structure diagram of the synchronous mechanism is shown in the figure. Figure 1 Figure 5 The schematic diagram of the left mold frame and the right mold frame in the mold opening state away from each other of the present application is shown in the figure.

[0020] ​​​In the figure: 1. Base, 11. Front bottom beam, 111. Front guide rail, 12. Rear bottom beam, 121. Rear guide rail, 13. Left connecting cross beam, 14. Right connecting cross beam, 15. Middle connecting cross beam, 16. Bottom beam connecting plate; 2. Left pull arm, 21. Left pull arm upper pull rod connecting hole, 22. Left pull arm lower pull rod connecting hole; 3. Right pull arm, 31. Right pull arm connecting seat, 311. Right die frame cover plate boss matching hole, 32. Right pull arm upper pull rod connecting hole, 33. Right pull arm lower pull rod connecting hole; 4a. Upper pull rod, 4b. Lower pull rod, 4c. Upper pull rod threaded head, 4d. Upper pull rod locking nut; 5. Left die frame, 51. Left die frame hinged seat, 511. Left die frame hinged seat cover plate, 52. Left die frame leg, 521. Left die frame sliding block, 6. Right die frame, 61. Right die frame cover plate, 62. Right die frame leg, 621. Right die frame sliding block; 7. Swing arm connecting frame, 71. Swing arm connecting frame hinged lug, 711. Bearing accommodating hole, 72. Swing arm connecting frame cover plate, 73. Swing arm connecting frame sliding block, 74. Swing arm connecting frame cover plate matching hole; 8. Dead point overrunning self-locking mechanism, 81. Motor, 82. Reducer, 821. Reducer shaft, 8211. Flat key, 83. Swing arm, 831. Swing arm transmission connecting hole, 8311. Flat key groove, 832. Swing arm shaft seat, 8321. Pull arm hinged shaft hole, 84. Pull arm, 841. Pull arm left hinged shaft, 8411. Pull arm left hinged shaft bearing, 842. Pull arm right hinged shaft, 8421. Pull arm right hinged shaft bearing, 843. Pull arm left threaded head, 8431. Pull arm left hinged shaft connector, 84311. Pull arm left hinged shaft hole, 8432. Pull arm left locking nut, 844. Pull arm right threaded head, 8441. Pull arm right hinged shaft connector, 84411. Pull arm right hinged shaft hole, 8442. Pull arm right locking nut, 85. Bearing, 851. Bearing inner ring hole; 9. Synchronization mechanism, 91. Synchronization gear seat, 911. Synchronization gear accommodating cavity, 912. Left die frame synchronization pull rod rack corresponding hole, 913. Swing arm connecting frame synchronization pull rod rack corresponding hole, 914. Synchronization gear shaft lower shaft head pivot support hole, 915. Synchronization gear accommodating cavity cover, 9151. Synchronization gear shaft upper shaft head pivot support hole, 92. Synchronization gear, 921. Synchronization gear shaft lower shaft head, 922. Synchronization gear shaft upper shaft head, 93. Left die frame synchronization pull rod, 931. Left die frame synchronization pull rod rack, 932. Left die frame synchronization pull rod threaded head, 94. Swing arm connecting frame synchronization pull rod, 941. Swing arm connecting frame synchronization pull rod rack, 942. Swing arm connecting frame synchronization pull rod threaded head. DETAILED DESCRIPTION

[0021] In order to make the technical essence and beneficial effects of the present application more clearly understood, the applicant will make a detailed description in the form of examples below, but the description of the examples is not a limitation on the technical scheme of the present application, and any equivalent transformation only in form but not in substance made according to the concept of the present application should be regarded as the technical scheme of the present application.

[0022] In the following description, the directional or positional concepts of up, down, left, right, front and back are all based on the current position state, and thus cannot be understood as a special limitation on the technical scheme provided by the present application. Figure 1 The current position state is taken as the reference, and thus cannot be understood as a special limitation on the technical scheme provided by the present application.

[0023] Please refer to Figure 1 , which shows a base 1 of the structural system of a plastic product forming machine, which is arranged on a platform like a floor above the floor or on the floor or on a similar carrier based on the floor in the use state; a left pull arm 2 corresponding to the upper left end of the aforementioned base 1 and a right pull arm 3 corresponding to the upper right end of the aforementioned base 1 and opposite to the left pull arm 2 are shown, an upper pull rod 4a is connected between the opposite sides of the upper ends of the left and right pull arms 2, 3, and a lower pull rod 4b is connected between the opposite sides of the lower ends of the left and right pull arms 2, 3 and at a position below the upper pull rod 4a, the upper and lower pull rods 4a, 4b are parallel to each other; a left mold frame 5 and a right mold frame 6 are shown, the bottoms of the left and right mold frames 5, 6 each form a sliding pair with the aforementioned base 1, and the right side center position of the right mold frame 6 is fixed with the left side middle part of the height direction of the aforementioned right pull arm 3; a swing arm connecting frame 7 of the structural system of the mold opening and closing device with a center locking function, a dead point overrunning self-locking mechanism 8 and a pair of synchronization mechanisms 9 are shown, the left side upper part of the swing arm connecting frame 7 is fixed with the right side middle part of the height direction of the aforementioned left pull arm 2, and the bottom forms a sliding pair with the aforementioned base 1, the dead point overrunning self-locking mechanism 8 is connected between the right side upper part of the swing arm connecting frame 7 and the left side center position of the aforementioned left mold frame 5, and the pair of synchronization mechanisms 9 are arranged on the aforementioned base 1 at a position between the aforementioned swing arm connecting frame 7 and the lower end of the left mold frame 5 and connected with the lower end of the swing arm connecting frame 7 and the lower end of the left mold frame 5.

[0024] By Figure 1As shown, a left pull arm upper pull rod connecting hole 21 is formed at the upper end of the left pull arm 2 and at a position corresponding to the left end of the upper pull rod 4a, and a left pull arm lower pull rod connecting hole 22 is formed at the lower end of the left pull arm 2 and at a position corresponding to the left end of the lower pull rod 4b; a right pull arm upper pull rod connecting hole 32 is formed at the upper end of the right pull arm 3 and at a position corresponding to the right end of the upper pull rod 4a, and a right pull arm lower pull rod connecting hole 33 is formed at the lower end of the right pull arm 3 and at a position corresponding to the right end of the lower pull rod 4b. The left and right ends of the aforementioned upper pull rod 4a are each provided with an upper pull rod threaded head 4c and are each defined by an upper pull rod locking nut 4d that is screwed onto the upper pull rod threaded head 4c after passing through the left pull arm upper pull rod connecting hole 21 and the right pull arm upper pull rod connecting hole 32, respectively. Since the structure and connection mode of the lower pull rod 4b are the same as those of the aforementioned upper pull rod 4a, they will not be described again.

[0025] As shown, Figure 1 As shown, the left and right pull arms 2, 3, the upper pull rod 4a, and the lower pull rod 4b form a parallelogram relationship, but the length of the left and right pull arms 2, 3, which are equal in length (i.e., the aforementioned height), is less than the length of the upper and lower pull rods 4a, 4b, which are equal in length.

[0026] Please continue to see Figure 1 and in combination Figure 2 The aforementioned base 1 includes a front bottom beam 11, a rear bottom beam 12, a left connecting cross beam 13, a right connecting cross beam 14, and a set of middle connecting cross beams 15, the front bottom beam 11 and the rear bottom beam 12 are parallel to each other in the length direction and are provided with a front guide rail 111 at the upper part of the length direction of the front bottom beam 11 and a rear guide rail 121 at the upper part of the length direction of the rear bottom beam 12, the left connecting cross beam 13 is fixed between the left end facing sides of the front and rear bottom beams 11, 12, the right connecting cross beam 14 is fixed between the right end facing sides of the front and rear bottom beams 11, 12, and the set of middle connecting cross beams 15 are fixed at intervals between the middle part facing sides of the front and rear bottom beams 11, 12; the bottom parts of the aforementioned left mold frame 5, right mold frame 6, and swing arm connecting frame 7 form sliding pairs with the front guide rail 111 and the rear guide rail 121; the aforementioned synchronization mechanism 9 is arranged at the upper part of one of the middle connecting cross beams 15 corresponding to the right side of the aforementioned swing arm connecting frame 7. A bottom beam connecting plate 16 for connecting the front and rear bottom beams 11, 12 is shown arranged at intervals on the bottom parts of the front and rear bottom beams 11, 12.

[0027] A pair of swing arm connecting frame hinged ears 71 are formed on the right upper part of the swing arm connecting frame 7, a bearing accommodating hole 711 is formed on each of the pair of swing arm connecting frame hinged ears 71, a left mold frame hinged seat 51 is fixed on the left center position of the left mold frame 5, and the dead point overrunning self-locking mechanism 8 is connected between the pair of swing arm connecting frame hinged ears 71 and the left mold frame hinged seat 51.

[0028] Please continue to see Figure 1 And see Figure 2 And Figure 3 The dead point overrunning self-locking mechanism 8 includes a motor 81, a reduction box 82, a swing arm 83, a pull arm 84 and a pair of bearings 85. The motor 81 is fixed to the front side of the reduction box 82 in a horizontal state and is in transmission cooperation with the reduction box 82. The reduction box shaft 821 of the reduction box 82 faces backward. The pair of bearings 85 are arranged in the bearing accommodating holes 711 on the pair of swing arm connecting frame hinged ears 71. The left end of the swing arm 83 is inserted between the pair of swing arm connecting frame hinged ears 71. A swing arm transmission connection hole 831 is formed on the left end of the swing arm 83. A flat key groove 8311 is formed on the hole wall of the swing arm transmission connection hole 831. The swing arm transmission connection hole 831 corresponds to the bearing inner ring hole 851 of the pair of bearings 85 (the bearing inner ring 85 is in transmission). A pair of swing arm shaft seats 832 corresponding to each other in front and back are formed on the right end of the swing arm 83. A pull arm hinged shaft hole 8321 corresponding to each other in front and back is formed on each of the pair of swing arm shaft seats 832. The left end of the pull arm 84 is hinged to the pair of swing arm shaft seats 832 through the pull arm left hinged shaft 841 provided with a pull arm left hinged shaft bearing 8411. The right end of the pull arm 84 is hinged to the left mold frame hinged seat 51 through the pull arm right hinged shaft 842 provided with a pull arm right hinged shaft bearing 8421. The reduction box shaft 821 of the reduction box 82 cooperates with the bearing inner ring hole 851. A flat key 8211 is formed on the reduction box shaft 821 at a position corresponding to the flat key groove 8311. The flat key 8211 is fixed to the flat key groove 8311 in key cooperation.

[0029] The left mold frame hinged seat 51 is fixed on a left mold frame hinged seat cover plate 511, and the left mold frame hinged seat cover plate 511 is fixed to the left center position of the left mold frame 5. In this embodiment, the motor 81 is a servo motor with forward and reverse rotation function.

[0030] Please see Figure 3As a preferred solution, a left pulling arm threaded head 843 is formed at the left end of the pulling arm 84, a right pulling arm threaded head 844 is formed at the right end of the pulling arm 84, a left pulling arm hinged shaft connecting head 8431 is threadedly connected to the left pulling arm threaded head 843, a left pulling arm hinged shaft hole 84311 is formed at the left end of the left pulling arm hinged shaft connecting head 8431, a right pulling arm hinged shaft connecting head 8441 is threadedly connected to the right pulling arm threaded head 844, a right pulling arm hinged shaft hole 84411 is formed at the right end of the right pulling arm hinged shaft connecting head 8441, the left pulling arm hinged shaft 841 is hinged to the pair of swing arm shaft seats 832 at a position corresponding to the left pulling arm hinged shaft hole 84311, and the right pulling arm hinged shaft 842 is hinged to the left mold frame hinged seat 51 at a position corresponding to the right pulling arm hinged shaft hole 84411.

[0031] After the left pulling arm threaded head 843 is screwed into the left pulling arm hinged shaft connecting head 8431, a left pulling arm locking nut 8432 threadedly fitted to the left pulling arm threaded head 843 is locked. Similarly, after the right pulling arm threaded head 844 is screwed into the right pulling arm hinged shaft connecting head 8441, a right pulling arm locking nut 8442 threadedly fitted to the right pulling arm threaded head 844 is locked. As can be seen from the foregoing description, as a preferred solution, the pulling arm 84 is adjustable as required.

[0032] A right mold frame cover plate 61 is fixed to the right middle portion of the right mold frame 6, and a right pulling arm connecting seat 31 is preferably fixed to the left middle portion of the right pulling arm 3 in the height direction by welding. The right mold frame 6 and the right pulling arm 3 are fixed by fasteners such as bolts through the right mold frame cover plate 61 and the right pulling arm connecting seat 31, that is, the right mold frame cover plate 61 and the right pulling arm connecting seat 31 are fixed to each other by fasteners such as bolts to fix the right mold frame 6 and the right pulling arm 3. A swing arm connecting frame cover plate 72 is fixed to the left upper portion of the swing arm connecting frame 7, and the upper portion of the swing arm connecting frame 7 and the left pulling arm 2 are fixed by fixing the swing arm connecting frame cover plate 72 to the right middle portion of the left pulling arm 2 in the height direction.

[0033] By Figure 1 and Figure 2As shown, the aforementioned right pull arm connecting seat 31 is essentially a right pull arm connecting plate, and a right die carrier cover plate boss matching hole 311 is formed on the right pull arm connecting seat 31, which penetrates through the thickness direction of the right pull arm connecting seat 31, i.e. from the left side to the right side of the right pull arm connecting seat 31. As compensation, a right die carrier cover plate boss is formed on the right side of the aforementioned right die carrier cover plate 61 and at the position corresponding to the right die carrier cover plate boss matching hole 311, which is inserted into the right die carrier cover plate boss matching hole 311. This matching mode has an extremely effective connection effect. The applicant needs to explain that if the aforementioned right die carrier cover plate boss matching hole 311 is formed as a circular cavity structure that does not penetrate through the thickness direction of the right pull arm connecting seat 31, it is also feasible. Therefore, regardless of the way adopted, it should be considered as falling within the technical connotation disclosed in the present application. As shown in Figure 2 the swing arm connecting frame cover plate matching hole 74 on the left side of the swing arm connecting frame 7 for the aforementioned swing arm connecting frame cover plate 72 to be fixed and matched, which is the same as the fixed and matched connection form of the aforementioned right die carrier cover plate 61 and the right pull arm connecting seat 31. Therefore, the applicant will not repeat it here.

[0034] As shown in Figure 1 , a pair of left die carrier legs 52 extend from the lower part of the aforementioned left die carrier 5 and at the positions corresponding to the aforementioned front bottom beam 11 and rear bottom beam 12, and a pair of left die carrier sliders 521 are respectively fixed at the bottom of the pair of left die carrier legs 52 and at the positions corresponding to the aforementioned front guide rail 111 and rear guide rail 121; a pair of right die carrier legs 62 extend from the lower part of the aforementioned right die carrier 6 and at the positions corresponding to the aforementioned front bottom beam 11 and rear bottom beam 12, and a pair of right die carrier sliders 621 are respectively fixed at the bottom of the pair of right die carrier legs 62 and at the positions corresponding to the front guide rail 111 and rear guide rail 121; a pair of swing arm connecting frame sliders 73 are respectively fixed at the bottom of the aforementioned swing arm connecting frame 7 and at the positions corresponding to the aforementioned front bottom beam 11 and rear bottom beam 12; the aforementioned pair of left die carrier sliders 521, right die carrier sliders 621 and pair of swing arm connecting frame sliders 73 form sliding pairs with the aforementioned front guide rail 111 and rear guide rail 121.

[0035] Please refer to Figure 4 and in combination with Figure 1 , as shown in Figure 1 , the aforementioned left pull arm 2 and right pull arm 3 are inclinedly arranged, and the inclination direction is inclined from back to front from top to bottom.

[0036] Since the aforementioned pair of synchronization mechanisms 9 has one pair, the structure of the synchronization mechanism 9 located at the rear is the same as that of the synchronization mechanism 9 located at the front, and the connection direction of the pair of synchronization mechanisms 9 between the aforementioned swing arm connecting frame 7 and the left mold frame 5 is opposite to each other, so that the synchronization mechanism 9 located at the front comprises a synchronization gear seat 91, a synchronization gear 92, a left mold frame synchronization pull rod 93 and a swing arm connecting frame synchronization pull rod 94, the synchronization gear seat 91 is fixed on the upper part of the corresponding one of the aforementioned group of middle connecting cross beams 15 corresponding to the right side of the aforementioned swing arm connecting frame 7 by screws, the synchronization gear seat 91 has a synchronization gear containing cavity 911, a left mold frame synchronization pull rod rack corresponding hole 912 is formed on the front cavity wall of the synchronization gear containing cavity 911, and a swing arm connecting frame synchronization pull rod rack corresponding hole 913 is formed on the rear cavity wall and at the position corresponding to the left mold frame synchronization pull rod rack corresponding hole 912, a synchronization gear shaft lower shaft head pivot supporting hole 914 is formed on the bottom wall of the synchronization gear containing cavity 911, a synchronization gear containing cavity cover 915 is fixed on the top of the synchronization gear containing cavity 911 by screws, a synchronization gear shaft upper shaft head pivot supporting hole 9151 is formed on the central part of the synchronization gear containing cavity cover 915 and at the position corresponding to the synchronization gear shaft lower shaft head pivot supporting hole 914, the synchronization gear 92 is rotatably arranged in the aforementioned synchronization gear containing cavity 911, and the front side and the rear side of the synchronization gear 92 correspond to the aforementioned left mold frame synchronization pull rod rack corresponding hole 912 and the swing arm connecting frame synchronization pull rod rack corresponding hole 913 respectively, the synchronization gear shaft lower shaft head 921 of the synchronization gear 92 is rotatably supported on the synchronization gear shaft lower shaft head pivot supporting hole 914, and the synchronization gear shaft upper shaft head 922 of the synchronization gear 92 is rotatably supported on the aforementioned synchronization gear shaft upper shaft head pivot supporting hole 9151, the right end of the left mold frame synchronization pull rod 93 has a left mold frame synchronization pull rod threaded head 932, which is fixedly connected with the lower end of the aforementioned left mold frame 5 by the left mold frame synchronization pull rod threaded head 932, and is locked on the right side of the left mold frame 5 by a locking nut, and the right end of the left mold frame synchronization pull rod 93 extends to the left side of the aforementioned synchronization gear seat 91 and is provided with a left mold frame synchronization pull rod rack 931 on the side facing the aforementioned synchronization gear containing cavity 911, the swing arm connecting frame synchronization pull rod 94 is located at the rear side of the left mold frame synchronization pull rod 93, the left end of the swing arm connecting frame synchronization pull rod 94 has a swing arm connecting frame synchronization pull rod threaded head 942, which is fixed with the lower part of the arm connecting frame 7 by the swing arm connecting frame synchronization pull rod threaded head 942 and is locked on the left side of the swing arm connecting frame 7 by a swing arm connecting frame synchronization pull rod locking nut, and the right end of the swing arm connecting frame synchronization pull rod 94 extends to the right side of the aforementioned synchronization gear seat 91 and is provided with a swing arm connecting frame synchronization pull rod rack 941 on the side facing the aforementioned synchronization gear containing cavity 911,The aforementioned synchronous gear 92 is engaged with the aforementioned left mold frame synchronous pull rod rack 931 and the swing arm connecting frame synchronous pull rod rack 941 at the same time at positions corresponding to the aforementioned left mold frame synchronous pull rod rack corresponding hole 912 and the swing arm connecting frame synchronous pull rod rack corresponding hole 913.

[0037] Please see Figures 1 to 5 , the applicant describes the mold opening and closing process of the application, because Figure 1 is the mold opening state, and because the mold opening process of the left and right mold frames 5, 6 is opposite to the mold closing process of the left and right mold frames 5, 6, the applicant only describes the transition from Figure 5 the mold opening state to Figure 1 the mold closing state. In addition, according to professional knowledge, the left and right mold frames 5, 6 are each fixed on one side of the left and right mold frames 5, 6, and the half-molds are matched to form a complete mold.

[0038] When the mold is closed, the motor 81 of the structure system of the dead point overrunning self-locking mechanism 8 works, drives the reduction box 82, and because the flat key 8211 on the reduction box shaft 821 is connected with the flat key groove 8311 in the swing arm transmission connection hole 831 at the left end of the swing arm 83, the swing arm 83 is driven by the reduction box shaft 821. Because the left end of the pull arm 84 is hinged to a pair of swing arm shaft seats 832 at the right end of the swing arm 83, and the right end of the pull arm 84 is hinged to the left mold frame hinge seat 51 of the left mold frame 5, when the swing arm 83 is driven to move by the reduction box shaft 821, the pull arm 84 is driven by the swing arm 83, and the left mold frame 5 is displaced to the right by the action of the pull arm 84 on the left mold frame hinge seat 51. In the process of the displacement of the left mold frame 5 to the right, the left mold frame synchronous pull rod rack 931 on the aforementioned left mold frame synchronous pull rod 93 of the structure system of the synchronous mechanism 9 drives the synchronous gear 92, the synchronous gear 92 drives the swing arm connecting frame 7 to displace to the left through the swing arm connecting frame synchronous pull rod rack 941, the swing arm connecting frame 7 pulls the right mold frame 6 to displace to the left through the upper and lower pull rods 4a, 4b, and the left mold frame 5 completes the mold closing.

[0039] In the aforementioned process, when the shaft centers of the reduction box shaft 821, the pull arm left hinge shaft 841, and the pull arm right hinge shaft 842 are on the same horizontal plane, the machine is in the dead point locking state, that is, the swing arm 83 and the pull arm 84 are on the same straight line, and the left mold frame hinge seat 51 pushes against the left mold frame 5. In the dead point locking state, the machine does not need to continuously use a large force to maintain the locking state, but relies on the mechanical structure self-locking. As mentioned above, the mold opening state is changed from Figure 1 the mold closing state to Figure 5 the mold opening state, as long as the motor 81 works in reverse, and the motion state of the corresponding components is opposite to the aforementioned.

[0040] Since the application adopts the structure of three templates, i.e. left and right mold frames 5 and 6, swing arm connecting frame 7, and inclined pull arms, i.e. left and right pull arms 2 and 3, and two pull rods, i.e. upper and lower pull rods 4a and 4b, the mold locking point is located at the center of the mold, and the mold locking force is uniform; the mold can be opened and closed by electricity, and the dead point is locked, i.e. when the mold is locked, the pull arm 84 shown in the figure, which can also be called a connecting rod, is supported flat, thereby achieving energy saving. Figure 1

[0041] In summary, the technical solution provided by the application makes up for the shortcomings in the prior art, successfully completes the invention task, and truly realizes the technical effects described by the applicant in the technical effect column above.​

Claims

1. A mold opening and closing device with a center mold locking function for a plastic product molding machine, the plastic product molding machine comprising a base (1); a left pull arm (2) and a right pull arm (3), the left pull arm (2) corresponding to the upper left end of the base (1), the right pull arm (3) corresponding to the upper right end of the base (1) and corresponding to the left pull arm (2), an upper pull rod (4a) is connected between the opposite sides of the upper ends of the left and right pull arms (2, 3), and a lower pull rod (4b) is connected between the opposite sides of the lower ends of the left and right pull arms (2, 3) and at a position corresponding to the lower side of the upper pull rod (4a), the upper and lower pull rods (4a, 4b) are parallel to each other; a left mold frame (5) and a right mold frame (6), the bottoms of the left and right mold frames (5, 6) each form a sliding pair with the base (1), and the right center position of the right mold frame (6) is fixed to the left middle part of the height direction of the right pull arm (3); it is characterized in that: The mold opening and closing device with a center mold locking function comprises a swing arm connecting frame (7), a dead point overrunning self-locking mechanism (8) and a pair of synchronization mechanisms (9); the upper left side of the swing arm connecting frame (7) is fixed to the middle right side of the left pulling arm (2) in the height direction, and the bottom forms a sliding pair with the base (1); the dead point overrunning self-locking mechanism (8) is connected between the upper right side of the swing arm connecting frame (7) and the left center position of the left mold frame (5); the pair of synchronization mechanisms (9) are arranged on the base (1) at a position between the swing arm connecting frame (7) and the lower end of the left mold frame (5) and are connected to the lower end of the swing arm connecting frame (7) and the lower end of the left mold frame (5).

2. The mold opening and closing device with central mold locking function of the plastic product molding machine according to claim 1, characterized in that: The base (1) comprises a front bottom beam (11), a rear bottom beam (12), a left connecting cross beam (13), a right connecting cross beam (14) and a group of middle connecting cross beams (15). The front bottom beam (11) and the rear bottom beam (12) are parallel to each other in the longitudinal direction, and a front guide rail (111) is fixed to the upper part of the longitudinal direction of the front bottom beam (11), and a rear guide rail (121) is fixed to the upper part of the longitudinal direction of the rear bottom beam (12). The left connecting cross beam (13) is fixed between the left ends of the front and rear bottom beams (11, 12) and the right connecting cross beam (14). A crossbeam (14) is fixed between the right ends of the front and rear bottom beams (11, 12) facing each other, and a group of intermediate connecting crossbeams (15) are fixed at intervals between the middle parts of the front and rear bottom beams (11, 12) facing each other; the bottoms of the left mold frame (5), the right mold frame (6) and the swing arm connecting frame (7) and the front guide rail (111) and the rear guide rail (121) form a sliding pair; the synchronization mechanism (9) is arranged on the upper part of an intermediate connecting crossbeam (15) in the group of intermediate connecting crossbeams (15) corresponding to the right side of the swing arm connecting frame (7).

3. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 1, characterized in that: A pair of swing arm connecting frame hinge ears (71) are formed on the upper right side of the swing arm connecting frame (7), and a bearing accommodating hole (711) is respectively provided on the pair of swing arm connecting frame hinge ears (71) and at corresponding front and rear positions. A left mold frame hinge seat (51) is fixed at the left center position of the left mold frame (5), and the dead point overtaking self-locking mechanism (8) is connected between the pair of swing arm connecting frame hinge ears (71) and the left mold frame hinge seat (51).

4. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 3, characterized in that: The dead point overtaking self-locking mechanism (8) includes a motor (81), a reduction gear box (82), a swing arm (83), a pulling arm (84) and a pair of bearings (85). The motor (81) is fixed to the front side of the reduction gear box (82) in a horizontal position and is in transmission cooperation with the reduction gear box (82). The reduction gear box shaft (821) of the reduction gear box (82) faces backward. The pair of bearings (85) are arranged in the bearing receiving holes (711) on the pair of swing arm connecting frame hinge ears (71). The left end of the swing arm (83) is placed between the pair of swing arm connecting frame hinge ears (71). A swing arm transmission connecting hole (831) is formed at the left end of the swing arm (83). A flat keyway (8311) is formed on the hole arm of the swing arm transmission connecting hole (831). The swing arm transmission connecting hole (831) corresponds to the bearing inner ring hole (851) of the pair of bearings (85). There is a pair of swing arm shaft seats (832) with corresponding positions in front and back, and each of the pair of swing arm shaft seats (832) has a pull arm hinge shaft hole (8321) with corresponding positions in front and back. The left end of the pull arm (84) is placed between the pair of swing arm shaft seats (832) and is hinged to the pair of swing arm shaft seats (832) through the pull arm left hinge shaft (841) equipped with a pull arm left hinge shaft bearing (8411), and the right end of the pull arm (84) is connected to the pair of swing arm shaft seats (832) through the pull arm left hinge shaft bearing (8411). The right hinge shaft (842) of the arm is hinged to the left mold frame hinge seat (51), and the reduction gear shaft (821) of the reduction gear (82) is matched with the inner ring hole (851) of the bearing. A flat key (8211) is formed on the reduction gear shaft (821) and at a position corresponding to the flat key groove (8311). The flat key (8211) is fixed by key matching with the flat key groove (8311).

5. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 4, characterized in that: The left mold frame articulated seat (51) is fixed on a left mold frame articulated seat cover plate (511), and the left mold frame articulated seat cover plate (511) is fixed to the left center position of the left mold frame (5); the motor (81) is a servo motor with forward and reverse rotation functions.

6. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 4, characterized in that: A left-hand threaded head (843) of the pulling arm is formed at the left end of the pulling arm (84), and a right-hand threaded head (844) of the pulling arm is formed at the right end of the pulling arm (84). A left-hand hinged shaft connecting head (8431) of the pulling arm is threadedly connected to the left-hand threaded head (843). A left-hand hinged shaft hole (84311) of the pulling arm is formed at the left end of the left-hand hinged shaft connecting head (8431). A right-hand hinged shaft connecting head (844) of the pulling arm is threadedly connected to the right-hand threaded head (844). The joint (8441) is provided with a right hinge shaft hole (84411) of the pulling arm at the right end of the right hinge shaft connector (8441); the left hinge shaft (841) of the pulling arm is hinged to the pair of swing arm shaft seats (832) at a position corresponding to the left hinge shaft hole (84311) of the pulling arm; and the right hinge shaft (842) of the pulling arm is hinged to the left mold frame hinge seat (51) at a position corresponding to the right hinge shaft hole (84411) of the pulling arm.

7. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 1, characterized in that: A right formwork cover plate (61) is fixed to the middle of the right side of the right formwork (6), and a right pull arm connecting seat (31) is fixed to the left side of the middle of the height direction of the right pull arm (3), and the right formwork (6) and the right pull arm (3) are fixed by fasteners through the right formwork cover plate (61) and the right pull arm connecting seat (31); a swing arm connecting frame cover plate (72) is fixed to the upper left side of the swing arm connecting frame (7), and the upper part of the swing arm connecting frame (7) is fixed to the left pull arm (2) by fixing the swing arm connecting frame cover plate (72) to the middle of the right side of the height direction of the left pull arm (2).

8. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 2, characterized in that: A pair of left mold frame legs (52) extend from the lower part of the left mold frame (5) and at positions corresponding to the front bottom beam (11) and the rear bottom beam (12); a pair of left mold frame sliders (521) are fixed at the bottom of the pair of left mold frame legs (52) and at positions corresponding to the front guide rail (111) and the rear guide rail (121); a pair of right mold frame legs (62) extend from the lower part of the right mold frame (6) and at positions corresponding to the front bottom beam (11) and the rear bottom beam (12); 2) and are fixed at the bottom of the swing arm connecting frame (7) and at positions corresponding to the front guide rail (111) and the rear guide rail (121); a pair of swing arm connecting frame sliders (73) are fixed at the bottom of the swing arm connecting frame (7) and at positions corresponding to the front bottom beam (11) and the rear bottom beam (12); the pair of left mold frame sliders (521), the right mold frame slider (621) and the pair of swing arm connecting frame sliders (73) form a sliding pair with the front guide rail (111) and the rear guide rail (121).

9. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 1 or 7, characterized in that: The left pulling arm (2) and the right pulling arm (3) are arranged tilted, and the tilting direction is from top to bottom and from back to front.

10. The mold opening and closing device with central mold locking function for a plastic product molding machine according to claim 2, characterized in that: In the pair of synchronization mechanisms (9), the synchronization mechanism (9) located at the rear has the same structure as the synchronization mechanism (9) located at the front, and the connection directions of the pair of synchronization mechanisms (9) between the swing arm connecting frame (7) and the left mold frame (5) are opposite to each other. The synchronization mechanism (9) located at the front includes a synchronization gear seat (91), a synchronization gear (92), a left mold frame synchronization rod (93) and a swing arm connecting frame synchronization rod (94). The synchronization gear seat (91) is fixed to the upper part of an intermediate connecting beam (15) corresponding to the right side of the swing arm connecting frame (7) in the group of intermediate connecting beams (15). The synchronization gear seat (91) has a synchronization gear accommodating cavity (91). 11), a left mold frame synchronous pull rod rack corresponding hole (912) is provided on the front cavity wall of the synchronous gear accommodating cavity (911), and a swing arm connecting frame synchronous pull rod rack corresponding hole (913) is provided on the rear cavity wall at a position corresponding to the left mold frame synchronous pull rod rack corresponding hole (912), a synchronous gear shaft lower shaft head pivot support hole (914) is provided on the bottom wall of the synchronous gear accommodating cavity (911), a synchronous gear accommodating cavity cover (915) is fixed at the top corresponding to the synchronous gear accommodating cavity (911), and a synchronous gear shaft upper shaft is provided in the central part of the synchronous gear accommodating cavity cover (915) at a position corresponding to the synchronous gear shaft lower shaft head pivot support hole (914). The synchronous gear (92) is rotatably arranged in the synchronous gear accommodating cavity (911), and the front side and the rear side of the synchronous gear (92) respectively correspond to the corresponding hole (912) of the synchronous pull rod rack of the left mold frame and the corresponding hole (913) of the synchronous pull rod rack of the swing arm connecting frame. The lower shaft head (921) of the synchronous gear shaft of the synchronous gear (92) is rotatably supported on the pivot support hole (914) of the lower shaft head of the synchronous gear shaft, and the upper shaft head (922) of the synchronous gear shaft of the synchronous gear (92) is rotatably supported on the pivot support hole (9151) of the upper shaft head of the synchronous gear shaft. The right end of the left mold frame synchronous pull rod (93) is fixed to the lower end of the left mold frame (5). The left mold frame synchronous pull rod (93) is connected, and the right end of the left mold frame synchronous pull rod (93) passes through the synchronous gear seat (91) and extends to the left side of the synchronous gear seat (91) and forms a left mold frame synchronous pull rod rack (931) on the side facing the synchronous gear accommodating chamber (911). The swing arm connecting frame synchronous pull rod (94) is located on the rear side of the left mold frame synchronous pull rod (93). The left end of the swing arm connecting frame synchronous pull rod (94) is fixed to the lower part of the arm connecting frame (7), and the right end of the swing arm connecting frame synchronous pull rod (94) passes through the synchronous gear seat (91) and extends to the right side of the synchronous gear seat (91) and forms a swing arm connecting frame synchronous pull rod rack (941) on the side facing the synchronous gear accommodating chamber (911).The synchronous gear (92) is meshed with the left mold frame synchronous pull rod rack (931) and the swing arm connecting frame synchronous pull rod rack (941) at the position corresponding to the corresponding hole (912) of the left mold frame synchronous pull rod rack and the corresponding hole (913) of the swing arm connecting frame synchronous pull rod rack.

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