A mold clamping driving device, a mold clamping system and a bottle preform injection molding machine

Abstract

The application relates to a mold closing driving device of an injection molding machine, a mold closing system and a preform injection molding machine, and belongs to the technical field of injection molding machines. The mold closing driving device comprises a driving box body, a high-speed servo motor, a gear transmission mechanism, a reciprocating rod-shaped rack and a guide sealing assembly. The high-speed servo motor is fixedly installed at the end of the driving box body, and the output end of the high-speed servo motor is in transmission connection with the gear transmission mechanism. The gear transmission mechanism is wholly accommodated in the driving box body, and the gear transmission mechanism comprises an upper combined gear shaft group, a lower combined gear shaft group and a driving gear shaft group. The upper and lower end faces of the meshing tooth rod are simultaneously clamped and engaged to drive the reciprocating rod-shaped rack to reciprocate, the radial component force borne by the rack can be counteracted, the problems of unbalanced load and unbalanced swing caused by one-side driving can be prevented, the meshing side gap can be effectively reduced, the impact and noise during mold opening and closing commutation can be reduced, and the transmission rigidity and motion stability can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, and more specifically, to an injection molding machine mold clamping drive device, mold clamping system, and preform injection molding machine. Background Technology

[0002] Preform injection molding machines are core equipment in the plastic packaging industry. The mold clamping device, as its core functional unit, directly determines the machine's mold opening and closing speed, clamping accuracy, and production cycle time. Currently, preform injection molding production is developing towards higher speeds, higher precision, and lower energy consumption, placing higher demands on the transmission rigidity, response speed, and operational stability of the mold clamping drive system.

[0003] Currently, existing injection molding machine mold clamping drive solutions suffer from problems such as oil leakage, response lag, and oil temperature affecting accuracy. Conventional electric gear and rack drive solutions often employ a single-sided gear meshing rack structure, which exhibits defects such as large meshing clearance, significant reversing impact, and easy swaying of the rack under uneven load under high-speed reciprocating operation. This reduces transmission rigidity and positioning accuracy, affects the smooth operation of the moving platen, and thus restricts the improvement of preform molding quality and production efficiency. At the same time, the integration of existing drive structures is insufficient, with functions such as guiding, sealing, lubrication, and cooling being scattered, making assembly and maintenance inconvenient, and the overall structural compactness needs to be improved. Therefore, there is an urgent need to design an injection molding machine mold clamping drive device, mold clamping system, and preform injection molding machine to solve the above problems. Summary of the Invention

[0004] In view of the problems in the related technologies, the present invention proposes an injection molding machine mold closing drive device, a mold closing system and a preform injection molding machine to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] The technical solution of this invention is implemented as follows: A mold clamping drive device for an injection molding machine includes a drive housing, a high-speed servo motor, a gear transmission mechanism, a reciprocating rod-shaped rack, and a guide sealing assembly; The high-speed servo motor is fixedly installed at the end of the drive housing, and the output end of the high-speed servo motor is connected to the gear transmission mechanism. The gear transmission mechanism is housed inside the drive housing, and includes an upper combined gear shaft group, a lower combined gear shaft group, and a drive gear shaft group. The upper and lower combined gear shaft groups are located on the upper and lower sides of the reciprocating rod rack, and the drive gear shaft group is connected to the high-speed servo motor and the lower combined gear shaft group respectively. The reciprocating rod-shaped rack is inserted into the drive housing along the opening and closing direction, and the reciprocating rod-shaped rack includes an integrally connected rack and push-pull rod. The upper and lower end faces of the rack are provided with meshing teeth, and the upper combined gear shaft group and the lower combined gear shaft group are both meshed with the rack. The guide sealing assembly is fixedly installed on the side wall of the drive housing corresponding to the extension of the push-pull rod.

[0006] Furthermore, the upper combined gear shaft assembly and the lower combined gear shaft assembly have the same and symmetrical structure, and each combined gear shaft assembly includes two gear shafts, two transmission gears and two push-pull gears arranged axially symmetrically. The two transmission gears and the two push-pull gears are coaxially fixedly mounted on the gear shafts, and the corresponding tooth surfaces of the push-pull gears mesh with the gear rack. The two transmission gears located on the upper combined gear shaft assembly and the two transmission gears located on the lower combined gear shaft assembly mesh with each other. The two ends of the gear shafts are rotatably supported on the inner wall of the drive housing by bearings.

[0007] Furthermore, the drive gear shaft assembly includes a drive shaft, a driven shaft, and a driving shaft. One end of the drive shaft is coaxially connected to the output end of a high-speed servo motor. A drive gear is fixedly mounted on the drive shaft. A first driven gear and a second driven gear are fixedly mounted on the driven shaft, and the first driven gear meshes with the drive gear. A first driving gear and two second driving gears distributed on both sides of the first driving gear are fixedly mounted on the driving shaft, and the first driving gear meshes with the second driven gears. The two second driving gears respectively mesh with two transmission gears on the lower combined gear shaft assembly.

[0008] Furthermore, the guide sealing assembly includes a fixed cylinder, a guide cylinder, a sealing ring, and a sealing groove. The fixed cylinder is fixedly installed at the opening on the side wall of the drive housing. The guide cylinder is movably embedded in the inner ring of the fixed cylinder. The inner hole of the guide cylinder slides with the outer wall of the push-pull rod. The sealing groove is opened at the inner end face of the fixed cylinder and the guide cylinder. The sealing ring is embedded in the sealing groove and sleeved on the outer periphery of the guide cylinder and the push-pull rod.

[0009] Furthermore, a sealing end cylinder is fixedly installed at the end of the drive housing away from the guide sealing assembly, and the sealing end cylinder is sealed to the drive housing and covers the outside of the gear rod.

[0010] Furthermore, the drive housing is also equipped with a braking mechanism, and the braking mechanism is connected to the drive gear shaft assembly for transmission.

[0011] Furthermore, the drive housing is provided with a cooling structure and a lubrication structure inside, with the cooling structure arranged along the inner wall of the drive housing and the lubrication structure provided corresponding to the gear meshing part and the rack mating surface.

[0012] An injection molding machine mold clamping system includes a mold plate support, a five-point mold clamping mechanism, a first guide rod, a guide sleeve, a moving mold plate, a fixed mold plate, and the injection molding machine mold clamping drive device. The drive housing is fixedly installed at the rear end of the template support, and the first guide rod is fixedly installed at the four front corners of the template support. The fixed template is fixedly installed at the front end of the first guide rod, and the moving template is slidably fitted onto the first guide rod via a guide sleeve. The five-point mold closing mechanism is located between the moving template and the template support, and the five-point mold closing mechanism includes a toggle linkage assembly, a crosshead, and a second guide rod. The middle of the crosshead is fixedly connected to the end of the push-pull rod of the reciprocating rod-shaped rack. The rear end of the toggle linkage assembly is hinged to the template support, the middle is hinged to the crosshead, and the front end is hinged to the back of the moving template. The second guide rod is fixedly installed on the template support and passes through the crosshead along the mold opening and closing direction.

[0013] Furthermore, the elbow linkage assembly is configured as two symmetrical sets, and each set of elbow linkage assembly is composed of multiple connecting rods that are sequentially hinged to form a five-point elbow structure. The elbow linkage assembly is driven by the injection molding machine mold closing drive device to straighten and bend the crosshead, and drive the moving template to reciprocate along the first guide rod.

[0014] A preform injection molding machine includes an injection device, a frame, and a mold clamping system. The mold clamping system and the injection device are both fixedly installed on the frame, and the nozzle of the injection device is arranged opposite to the mold cavity of the mold clamping system.

[0015] The beneficial effects of this invention are: 1. In this invention, the upper and lower combined gear shaft groups are arranged symmetrically. During operation, the upper and lower transmission gears mesh with each other to achieve synchronous reverse rotation. The upper and lower push-pull gears simultaneously clamp the upper and lower end faces of the meshing rack to drive the rack to reciprocate. This can offset the radial component force on the rack, prevent the problem of uneven load and sway caused by unilateral drive, effectively reduce the meshing backlash, reduce the impact and noise during mold opening and closing and reversal, and significantly improve the transmission rigidity and motion stability.

[0016] 2. In this invention, the drive gear shaft group structure, which consists of a drive shaft, a driven shaft, and a driving shaft, transmits power step by step through the drive gear, the first driven gear, the second driven gear, and the first driving gear. Then, the two second driving gears synchronously drive the two lower gear shafts, which can achieve speed reduction and torque increase, improve the output driving force, and at the same time ensure the synchronous operation of the left and right transmission gears, so that the rack is evenly stressed on both sides and the power transmission is stable and reliable.

[0017] 3. In this invention, the guide sealing assembly is set up so that the guide cylinder in the fixed cylinder provides radial sliding support and guidance for the extension section of the push-pull rod during operation, and the sealing ring in the sealing groove simultaneously achieves axial external sealing. This can accurately limit the radial deflection of the rack, ensure the accuracy of linear motion, and effectively prevent the leakage of lubricating medium in the drive housing, and block external dust, cooling water and other impurities from entering the drive housing.

[0018] 4. In this invention, by integrating a braking mechanism, a cooling structure, and a lubrication structure into the drive housing, the braking mechanism can brake and lock the drive gear shaft assembly during shutdown, pressure holding, or emergency conditions, thereby improving the equipment's position holding capability and operational safety. The cooling structure, arranged along the inner wall of the housing, can continuously remove the heat generated by the transmission, controlling the temperature rise and preventing thermal deformation from affecting the transmission accuracy. The lubrication structure can continuously supply lubricating medium to the gear meshing surface and the rack mating surface, reducing component wear. The synergy of these multiple structures ensures the equipment operates stably at high speed for extended periods, extending the service life of core components.

[0019] 5. In this invention, the mold closing system structure consisting of a double guide rod and a five-point mold closing mechanism is used. During operation, the reciprocating rod-shaped rack pushes the crosshead to move precisely along the second guide rod, thereby driving the upper and lower symmetrical elbow connecting rod assembly to unfold or bend, and driving the moving template to move smoothly back and forth along the first guide rod, thus achieving rapid mold locking and mold opening. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of an injection molding machine mold closing drive device, a mold closing system, and a drive housing for a preform injection molding machine.

[0022] Figure 2 This is a schematic diagram of the mold closing drive device, mold closing system, cooling structure, and braking mechanism of an injection molding machine for preforms.

[0023] Figure 3 This is a schematic diagram of the structure of a mold clamping drive device, a mold clamping system, and a moving and fixed mold platen of a preform injection molding machine.

[0024] Figure 4 This is a sectional view of a mold clamping drive device, a mold clamping system, and a drive housing for a preform injection molding machine.

[0025] Figure 5This is a schematic diagram of a mold clamping drive device, a mold clamping system, and a toothed rod and push-pull rod structure for an injection molding machine for preforms.

[0026] Figure 6 This is a cross-sectional view of a mold clamping drive device, a mold clamping system, and a guide sealing assembly for a preform injection molding machine.

[0027] Figure 7 This is a schematic diagram of the structure of an injection molding machine mold closing drive device, a mold closing system, and a gear transmission mechanism for a preform injection molding machine.

[0028] Figure 8 This is a development diagram of a mold clamping drive device, a mold clamping system, and a gear transmission mechanism for a preform injection molding machine.

[0029] Figure 9 This is a schematic diagram of a mold clamping drive device, a mold clamping system, and a five-point mold clamping mechanism for a preform injection molding machine.

[0030] Figure label: 1. Drive housing; 2. High-speed servo motor; 3. Guide sealing assembly; 31. Fixed cylinder; 32. Guide cylinder; 33. Sealing ring; 34. Sealing groove; 4. Reciprocating rod-shaped rack; 41. Rack; 42. Push-pull rod; 5. Braking mechanism; 6. Sealing end cylinder; 7. Cooling structure; 8. Lubrication structure; 9. Gear transmission mechanism; 91. Upper combined gear shaft assembly; 911. Gear shaft; 912. Transmission gear; 913. Push-pull gear; 92. Lower combined gear shaft assembly; 93. Drive gear shaft assembly; 931. Drive shaft; 932. Drive gear; 933. Driven shaft; 934. First driven gear; 935. Second driven gear; 936. Drive shaft; 937. Second drive gear; 938. First drive gear; 10. Template support; 11. Five-point mold closing mechanism; 111. Crank linkage assembly; 112. Crosshead; 113. Second guide rod; 12. First guide rod; 13. Guide sleeve; 14. Moving template; 15. Fixed template. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0032] Please see Figures 1-9 A mold clamping drive device for an injection molding machine includes a drive housing 1, a high-speed servo motor 2, a gear transmission mechanism 9, a reciprocating rod-shaped rack 4, and a guide sealing assembly 3. The high-speed servo motor 2 is fixedly installed at the end of the drive housing 1, and the output end of the high-speed servo motor 2 is connected to the gear transmission mechanism 9. The gear transmission mechanism 9 is housed entirely within the drive housing 1. The gear transmission mechanism 9 includes an upper combined gear shaft assembly 91, a lower combined gear shaft assembly 92, and a drive gear shaft assembly 93. The upper combined gear shaft assembly 91 and the lower combined gear shaft assembly 92 are respectively located on the upper and lower sides of the reciprocating rod-shaped rack 4. The drive gear shaft assembly 93 is connected to the high-speed servo motor 2 and the lower combined gear shaft assembly 92 respectively. The upper combined gear shaft assembly 91 and the lower combined gear shaft assembly 92 have identical and symmetrical structures. Each combined gear shaft assembly includes two gear shafts 911 arranged axially symmetrically, two transmission gears 912, and two push-pull gears. Gear 913, two transmission gears 912, and two push-pull gears 913 are coaxially fixedly mounted on gear shaft 911, and the push-pull gears 913 mesh with the corresponding tooth surfaces of the rack 41. The two transmission gears 912 on the upper combined gear shaft assembly 91 and the lower combined gear shaft assembly 92 mesh correspondingly. The two ends of the gear shaft 911 are rotatably supported on the inner wall of the drive housing 1 by bearings. The drive gear shaft assembly 93 includes a drive shaft 931, a driven shaft 933, and a driving shaft 936. One end of the drive shaft 931 is coaxially connected to the output end of the high-speed servo motor 2. Drive gears are fixedly mounted on the drive shaft 931. Wheel 932, driven shaft 933 has a first driven gear 934 and a second driven gear 935 fixedly mounted on it, and the first driven gear 934 meshes with the drive gear 932. Drive shaft 936 has a first drive gear 938 and two second drive gears 937 distributed on both sides of the first drive gear 938 fixedly mounted on it, and the first drive gear 938 meshes with the second driven gears 935. The two second drive gears 937 respectively mesh with two transmission gears 912 on the lower combined gear shaft assembly 92. The high-speed servo motor 2 drives the drive shaft 931 and the drive gear 932 to rotate synchronously, and the first driven gear... After the driven shaft 934 and the second driven gear 935 drive the drive shaft 936 to rotate in stages, the two second drive gears 937 drive the two transmission gears 912 of the lower combined gear shaft group 92 to rotate in the same direction. Then, through the meshing transmission of the upper and lower transmission gears 912, the transmission gears 912 of the upper combined gear shaft group 91 rotate in the opposite direction. Finally, the push-pull gears 913 on the upper and lower sides rotate in the opposite direction synchronously, and together clamp and drive the reciprocating rod rack 4 to achieve linear reciprocating motion, which cancels the radial component force on the rack, effectively reduces the meshing clearance, reduces the reversing impact, and significantly improves the transmission rigidity and running stability. A reciprocating rod rack 4 is inserted into the drive housing 1 along the opening and closing mold direction. The reciprocating rod rack 4 includes an integrally connected rack 41 and push-pull rod 42. The upper and lower end faces of the rack 41 are provided with meshing teeth. The upper combined gear shaft group 91 and the lower combined gear shaft group 92 are both meshed with the rack 41. The reciprocating rod rack 4 is clamped from the upper and lower sides and driven to make linear reciprocating motion. The guide sealing assembly 3 is fixedly installed on the side wall of the drive housing 1 corresponding to the extended section of the push-pull rod 42. It is used to guide and seal the extended section of the reciprocating rod-shaped rack 4. The guide sealing assembly 3 includes a fixed cylinder 31, a guide cylinder 32, a sealing ring 33, and a sealing groove 34. The fixed cylinder 31 is fixedly installed at the opening on the side wall of the drive housing 1. The guide cylinder 32 is movably embedded in the inner ring of the fixed cylinder 31. The inner hole of the guide cylinder 32 slides with the outer wall of the push-pull rod 42. The sealing groove 34 is opened at the inner end face of the fixed cylinder 31 and the guide cylinder 32. The sealing ring 33 is embedded in the sealing groove 34 and sleeved. Around the outer periphery of the guide cylinder 32 and the push-pull rod 42, the rack 41 receives the driving force of the push-pull gears 913 on both sides through the upper and lower double-sided meshing teeth, driving the push-pull rod 42 to translate axially and output linear power. The guide cylinder 32 and the outer wall of the push-pull rod 42 slide together to form radial support and limit the extended end of the rack. The sealing ring 33, under the positioning of the sealing groove 34, tightly adheres to the outer periphery of the push-pull rod 42 to form a sealing barrier, thereby limiting the radial runout of the reciprocating rod rack 4, ensuring the guiding accuracy of the linear motion, and at the same time achieving reliable sealing inside and outside the drive housing 1 to prevent leakage of lubricating medium and intrusion of external dust, cooling water and other impurities.

[0033] In this invention, a sealing end cylinder 6 is fixedly installed at the end of the drive housing 1 away from the guide sealing assembly 3, and the sealing end cylinder 6 is sealed to the drive housing 1 and covers the outside of the gear 41. The sealing end cylinder 6 forms a closed shield to the rear opening of the drive housing 1, and accommodates the tail end of the gear 41 in the closed space. This can effectively prevent external dust and moisture from entering the drive housing 1, avoid contamination and corrosion of the transmission components, and prevent internal lubricating grease from splashing outward.

[0034] In this invention, the drive housing 1 is also provided with a braking mechanism 5, and the braking mechanism 5 is connected to the drive gear shaft assembly 93 for braking and locking the drive gear shaft assembly 93. The drive housing 1 is provided with a cooling structure 7 and a lubrication structure 8. The cooling structure 7 is arranged along the inner wall of the drive housing 1 to remove the heat generated during the transmission process. The lubrication structure 8 is provided corresponding to the gear meshing part and the rack mating surface to supply lubricating medium.

[0035] An injection molding machine mold closing system includes a mold plate support 10, a five-point mold closing mechanism 11, a first guide rod 12, a guide sleeve 13, a moving mold plate 14, a fixed mold plate 15, and an injection molding machine mold closing drive device. The drive housing 1 is fixedly installed at the rear end of the template support 10, and the first guide rod 12 is fixedly installed at the four front corners of the template support 10. The fixed template 15 is fixedly installed at the front end of the first guide rod 12. The moving template 14 is slidably fitted onto the first guide rod 12 through the guide sleeve 13. The five-point mold closing mechanism 11 is set between the moving template 14 and the template support 10. The five-point mold closing mechanism 11 includes a toggle linkage assembly 111, a crosshead 112, and a second guide rod 113. The middle of the crosshead 112 is fixedly connected to the end of the push-pull rod 42 of the reciprocating rod rack 4. The rear end of the toggle linkage assembly 111 is hinged to the template support 10, the middle is hinged to the crosshead 112, and the front end is hinged to the back of the moving template 14. The second guide rod 113 is fixedly installed on the template support 10 and passes through the crosshead 112 along the mold opening and closing direction. The elbow linkage assembly 111 is configured as two symmetrical sets, and each set of elbow linkage assemblies 111 consists of multiple connecting rods that are sequentially hinged to form a five-point elbow structure. The elbow linkage assembly 111 pushes the crosshead 112 to straighten and bend through the injection molding machine's mold closing drive device, and drives the moving platen 14 to reciprocate along the first guide rod 12 to realize the mold closing and mold opening actions. When the mold is closed, the reciprocating rod-shaped rack 4 pushes the crosshead 112 to move forward along the second guide rod 113, which drives the elbow linkage assembly 111 to gradually unfold and straighten, and pushes the moving platen 14 to move smoothly along the first guide rod 12 through the guide sleeve 13 to the fixed platen 15, and finally reaches the maximum unfolding range to realize mold locking. When the mold is opened, the reciprocating rod-shaped rack 4 pulls the crosshead 112 to move backward, and the elbow linkage assembly 111 bends and retracts, which drives the moving platen 14 to move backward to open the mold, thereby realizing rapid mold locking and mold opening with the help of the five-point mold closing mechanism 11.

[0036] A preform injection molding machine includes an injection unit, a frame, and an injection molding machine clamping system. Both the clamping system and the injection unit are fixedly mounted on the frame, and the nozzle of the injection unit is positioned opposite to the mold cavity of the clamping system. After the clamping system locks the mold, the injection unit injects molten plastic into the mold cavity. After holding pressure and cooling, the clamping system opens the mold and removes the preform, completing a full production cycle. The molding machine equipped with the above-mentioned clamping drive device can achieve high-speed mold opening and locking, resulting in a fast production cycle and stable molding quality.

[0037] In summary, with the aid of the above-mentioned technical solution of the present invention, the working principle of the present invention is as follows: When the mold is closed, the high-speed servo motor 2 outputs rotational power, driving the drive shaft 931 to rotate synchronously. The drive gear 932, which is fixedly mounted on the drive shaft 931, rotates accordingly. Through gear meshing, it drives the first driven gear 934 to rotate, thereby causing the driven shaft 933 and the coaxially fixed second driven gear 935 to rotate coaxially together. The second driven gear 935 meshes and drives the first driving gear 938 to rotate, causing the driving shaft 936 and the two second driving gears 937 distributed on both sides of the first driving gear 938 to rotate synchronously. The two second driving gears 937 respectively mesh with the two transmission gears 912 on the lower combined gear shaft assembly 92, driving the two lower gear shafts 911 and the corresponding coaxially fixed push-pull gears 913 to rotate in the same direction. At the same time, the two transmission gears 912 on the lower combined gear shaft assembly 92 rotate in the same direction. The transmission gears 912 mesh with the two corresponding transmission gears 912 on the upper combined gear shaft group 91, driving the upper gear shaft 911 and the push-pull gear 913 to rotate in opposite directions. This makes the upper combined gear shaft group 91 and the lower combined gear shaft group 92 rotate synchronously in opposite directions. The push-pull gears 913 on both sides simultaneously mesh with the meshing teeth on the upper and lower end faces of the reciprocating rod rack 41. The reciprocating rod rack 4 is clamped and driven to move forward in a straight line along the axial direction from both sides. The push-pull rod 42 at the front end of the reciprocating rod rack 4 drives the cross head 112 to move forward along the second guide rod 113, pushing the elbow connecting rod assembly 111 of the five-point mold closing mechanism 11 to gradually unfold and straighten. This pushes the moving template 14 to move smoothly towards the fixed template 15 along the first guide rod 12 through the guide sleeve 13. Finally, the elbow connecting rod assembly 111 reaches the maximum unfolding range, completing the mold closing action. When the mold is opened, the high-speed servo motor 2 outputs power in the reverse direction, which is transmitted in the reverse direction through the above-mentioned transmission chain, driving the reciprocating rod rack 4 to move backward along the axis, pulling the crosshead 112 backward to bend and retract the elbow connecting rod assembly 111, thereby driving the moving template 14 to move backward smoothly to realize the mold opening. During equipment operation, the guide sealing assembly 3 provides guidance support and sealing protection for the extended section of the reciprocating rod rack 4. The braking mechanism 5 can brake and lock the transmission system as needed. The cooling structure 7 and the lubrication structure 8 maintain the temperature stability inside the drive housing 1 and the lubrication status of the transmission components, respectively, ensuring the long-term stable operation of the equipment.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold clamping drive device for an injection molding machine, characterized in that, It includes a drive housing (1), a high-speed servo motor (2), a gear transmission mechanism (9), a reciprocating rod rack (4), and a guide sealing assembly (3). The high-speed servo motor (2) is fixedly installed at the end of the drive housing (1), and the output end of the high-speed servo motor (2) is connected to the gear transmission mechanism (9). The gear transmission mechanism (9) is housed inside the drive housing (1), and the gear transmission mechanism (9) includes an upper combined gear shaft assembly (91), a lower combined gear shaft assembly (92) and a drive gear shaft assembly (93). The upper combined gear shaft assembly (91) and the lower combined gear shaft assembly (92) are respectively located on the upper and lower sides of the reciprocating rod rack (4), and the drive gear shaft assembly (93) is connected to the high-speed servo motor (2) and the lower combined gear shaft assembly (92) respectively. The reciprocating rod-shaped rack (4) is inserted into the drive housing (1) along the opening and closing mold direction, and the reciprocating rod-shaped rack (4) includes an integrally connected rack (41) and push-pull rod (42). The upper and lower end faces of the rack (41) are provided with meshing teeth, and the upper combined gear shaft group (91) and the lower combined gear shaft group (92) are both meshed with the rack (41). The guide sealing assembly (3) is fixedly installed on the side wall of the drive housing (1) corresponding to the push-pull rod (42) extending out.

2. The injection molding machine mold clamping drive device according to claim 1, characterized in that, The upper combined gear shaft group (91) and the lower combined gear shaft group (92) have the same structure and are symmetrical. Each combined gear shaft group includes two gear shafts (911), two transmission gears (912) and two push-pull gears (913) arranged axially symmetrically. The two transmission gears (912) and the two push-pull gears (913) are coaxially fixedly mounted on the gear shafts (911). The push-pull gears (913) mesh with the corresponding tooth surfaces of the rack (41). The two transmission gears (912) located on the upper combined gear shaft group (91) and the two transmission gears (912) located on the lower combined gear shaft group (92) mesh with each other. The two ends of the gear shafts (911) are rotatably supported on the inner wall of the drive housing (1) by bearings.

3. The injection molding machine mold clamping drive device according to claim 2, characterized in that, The drive gear shaft assembly (93) includes a drive shaft (931), a driven shaft (933), and a drive shaft (936). One end of the drive shaft (931) is coaxially connected to the output end of the high-speed servo motor (2). A drive gear (932) is fixedly mounted on the drive shaft (931). A first driven gear (934) and a second driven gear (935) are fixedly mounted on the driven shaft (933). The first driven gear (934) meshes with the drive gear (932). A first drive gear (938) and two second drive gears (937) distributed on both sides of the first drive gear (938) are fixedly mounted on the drive shaft (936). The first drive gear (938) meshes with the second driven gears (935). The two second drive gears (937) mesh with two transmission gears (912) on the lower combined gear shaft assembly (92), respectively.

4. The injection molding machine mold clamping drive device according to claim 3, characterized in that, The guide sealing assembly (3) includes a fixed cylinder (31), a guide cylinder (32), a sealing ring (33), and a sealing groove (34). The fixed cylinder (31) is fixedly installed at the side wall opening of the drive housing (1). The guide cylinder (32) is movably embedded in the inner ring of the fixed cylinder (31). The inner hole of the guide cylinder (32) slides with the outer wall of the push-pull rod (42). The sealing groove (34) is opened at the inner ring end face of the fixed cylinder (31) and the guide cylinder (32). The sealing ring (33) is embedded in the sealing groove (34) and sleeved on the outer periphery of the guide cylinder (32) and the push-pull rod (42).

5. The injection molding machine mold clamping drive device according to claim 4, characterized in that, A sealing end cylinder (6) is fixedly installed at one end of the drive housing (1) away from the guide sealing assembly (3), and the sealing end cylinder (6) is sealed to the drive housing (1) and covers the outside of the gear rod (41).

6. The injection molding machine mold clamping drive device according to claim 5, characterized in that, The drive housing (1) is also provided with a braking mechanism (5), and the braking mechanism (5) is connected to the drive gear shaft group (93) for transmission.

7. The injection molding machine mold clamping drive device according to claim 6, characterized in that, The drive housing (1) is provided with a cooling structure (7) and a lubrication structure (8) inside. The cooling structure (7) is arranged along the inner wall of the drive housing (1), and the lubrication structure (8) is provided corresponding to the gear meshing part and the rack mating surface.

8. A mold clamping system for an injection molding machine, characterized in that, It includes a template support (10), a five-point mold closing mechanism (11), a first guide rod (12), a guide sleeve (13), a moving template (14), a fixed template (15), and an injection molding machine mold closing drive device as described in any one of claims 1-7; The drive housing (1) is fixedly installed at the rear end of the template support (10), and the first guide rod (12) is fixedly installed at the four front corners of the template support (10). The fixed template (15) is fixedly installed at the front end of the first guide rod (12). The moving template (14) is slidably fitted onto the first guide rod (12) through the guide sleeve (13). The five-point mold closing mechanism (11) is located between the moving template (14) and the template support (10), and the five-point mold closing mechanism (11) includes a toggle linkage assembly (11). 1) Crosshead (112) and second guide rod (113). The middle part of the crosshead (112) is fixedly connected to the end of the push-pull rod (42) of the reciprocating rod rack (4). The rear end of the elbow connecting rod assembly (111) is hinged to the template support (10), the middle part is hinged to the crosshead (112), and the front end is hinged to the back of the moving template (14). The second guide rod (113) is fixedly installed on the template support (10) and passes through the crosshead (112) along the opening and closing direction.

9. The injection molding machine mold clamping system according to claim 8, characterized in that, The elbow linkage assembly (111) is set as two symmetrical sets, and each set of elbow linkage assembly (111) is composed of multiple connecting rods that are hinged in sequence to form a five-point elbow structure. The elbow linkage assembly (111) is driven by the injection molding machine mold closing drive device to straighten and bend the cross head (112) and drive the moving template (14) to move back and forth along the first guide rod (12).

10. A preform injection molding machine, characterized in that, The system includes an injection unit, a frame, and an injection molding machine clamping system as described in claim 8. Both the injection molding machine clamping system and the injection unit are fixedly mounted on the frame, and the nozzle of the injection unit is arranged opposite to the mold cavity of the clamping system.

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