Oil-electricity composite type mold closing device of injection molding machine

Abstract

The utility model relates to the field of injection molding machines, and discloses an oil-electricity composite mold closing device of an injection molding machine, which comprises a tail plate, a fixed mold plate, a movable mold plate and a thrust seat, the electrically-driven mold moving assembly comprises a nut fixedly installed on the thrust seat and a lead screw with one end connected with the nut and the other end connected with the tail plate, the lead screw is rotationally connected with the tail plate through a rotating bearing and can do reciprocating motion in the axial direction of the lead screw relative to the tail plate, and an oil-driven mold locking assembly is arranged between the tail plate and the lead screw. The oil-driven mold locking assembly comprises a fixed meshing piece fixed to the lead screw, a mold locking oil cylinder fixed to the tail plate and a movable meshing piece which is fixed to the end of a piston rod of the mold locking oil cylinder and is meshed with or unmeshed with the fixed meshing piece along with stretching and retracting of the piston rod. And a traction baffle ring is fixed at one end, far away from the fixed occlusion piece, of the movable occlusion piece on the lead screw. According to the mold closing device, the mold moving precision and sufficient mold locking force are ensured, and meanwhile, the cost is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine field especially relates to a injection molding machine oil electricity compound type mold closing device. BACKGROUND

[0002] The conventional three-plate injection molding machine is divided into three-plate electric injection molding machine and three-plate hydraulic injection molding machine according to the mold closing driving mode. The three-plate electric injection molding machine has high precision in actual work, and the lock mold screw rod only needs to provide the force to push the movable mold plate and overcome the friction in the mold moving process. The force is small, but in the mold locking stage, it needs to support the huge mold locking force, so its performance completely needs to be determined according to the mold locking force, which leads to a large amount of performance and cost waste in the mold moving working condition. The three-plate hydraulic injection molding machine needs to push the mold closing of the thrust bearing due to the mold locking oil cylinder, and the piston rod stroke is long, which leads to the length of the machine body size more than the mold moving section, increases the volume of the injection molding machine and the energy consumption in the normal working state, and the precision is relatively low.

[0003] Based on the advantages and disadvantages of the three-plate electric injection molding machine and the three-plate hydraulic injection molding machine, the electric composite mold closing mechanism disclosed in the Chinese patent with the authorized publication number CN102189652B contains a servo motor, a screw pair and a top column. The servo motor is connected with the screw in the screw pair, the screw nut in the screw pair is fixed on the top column connected with the movable mold plate, the screw is matched with the screw nut fixed on one end of the top column, the other end of the top column is fixed with the movable mold plate, the servo motor drives the screw to rotate after starting, the screw gives the screw nut axial feeding force, the screw nut is fixed on the top column, the top column pushes the movable mold plate to make axial reciprocating motion, and the mold locking device controlled by oil pressure is further included. The high-pressure mold locking oil cylinder is contained in the rear mold plate, the high-pressure oil enters the mold locking cavity to push the mold locking piston, the mold locking piston passes through the pair of open and close clamping nuts, the surface of the top column with external threads and the movable mold plate to transmit the mold locking force to the mold.

[0004] In the structure, the two ends of the top column are respectively fixed with a screw nut and a moving template, the moving template and the rear template are guided through a pull rod, with the rotation of the screw, the top column and the moving template reciprocate along the axial direction of the screw, the rear template is provided with a mold locking oil cylinder, the mold locking piston is guided to extend and retract relative to the rear template, two split embracing nuts which can move along the radial direction of the mold locking piston are arranged on the mold locking piston, when the split embracing nuts embrace, the split embracing nuts engage with the external threads on the outer ring wall of the top column, the movement of the top column is limited, and then the rotation of the screw is limited, the mold locking is realized, the above scheme has the following disadvantages: 1, the mold locking oil cylinder and the embracing oil cylinder need to be arranged, the embracing oil cylinder is only used to realize the engagement of the embracing nut and the external threads of the top column, has no mold locking performance, more than two embracing oil cylinders need to be arranged to ensure the stability of the engagement with the top column, the top column needs to be provided for the screw to be inserted, therefore, the diameter of the top column is large, and the external threads of the top column need to be designed with a certain length and high precision, which leads to the significant increase of the design cost and the operation cost; 2, a support needs to be fixedly arranged at the end, away from the moving template, of the rear template, the screw is arranged in the support, and the servo motor is fixed at the end of the support, the length of the support is positively related to the length of the screw, the length of the screw is positively related to the moving distance of the moving template, so that the length of the machine body of the whole injection molding machine is still very long, and the design cost and the operation cost are increased. Utility model content

[0005] The utility model provides a kind of injection molding machine oil-electricity composite type mold closing device that can significantly reduce cost in view of the higher design cost and operation cost caused by the higher design difficulty, more complex structure and larger machine length of the existing electric composite mold closing mechanism.

[0006] To solve the above technical problems, the utility model solves by the following technical schemes:

[0007] A kind of injection molding machine oil-electricity composite type mold closing device, including tail plate and fixed die plate being fixedly arranged on the machine body and guiding moving between the two, pusher seat is arranged between dynamic template and tail plate and pusher seat is respectively connected with tail plate and dynamic template through connecting rod assembly, electric drive shift module is arranged between tail plate and pusher seat, electric drive shift module includes screw nut being fixedly installed on pusher seat, screw being connected with screw nut at one end and being connected with tail plate at the other end, screw is rotatably connected with tail plate by rotating bearing while being movable along the axial direction of screw relative to tail plate, oil-driven mold locking assembly is arranged between tail plate and screw, oil-driven mold locking assembly includes fixed engagement piece being fixed on screw, mold locking oil cylinder being fixed on tail plate and moving engagement piece being fixed on piston rod end of mold locking oil cylinder and being engaged or disengaged with fixed engagement piece along with the extension and retraction of piston rod, pull stop ring is fixed on screw at the end, away from fixed engagement piece, of moving engagement piece.

[0008] Adopting the above scheme, the moving die plate moving process is mainly driven by the screw rotation, when the moving die plate moves to the specified position, the lock oil cylinder piston rod is extended, first make the moving and fixed die components engage, make the screw and the lock oil cylinder connected, with the piston rod continues to extend, push the screw, the thrust seat together forward, and then make the moving die plate and the fixed die plate close and provide the required locking force by the lock oil cylinder; the lock oil cylinder in the process of stretching and retracting, with independent locking and breaking function, and the function of the background technology of the holding oil cylinder, that is, the fixed die component and the moving die component are engaged to realize the connection function of the lock oil cylinder and the screw, so that the lock oil cylinder can carry the screw and the thrust seat to move to the fixed die direction, and then drive the moving die to close to the fixed die and realize the locking, the above structure, the holding oil cylinder, the top column and the bracket are omitted, the structure is simplified, the manufacturing difficulty is reduced, the length of the machine body is shortened, and the design cost is significantly reduced. The stroke of the oil cylinder is much shorter than the running stroke of the thrust seat, which further saves the operation cost and design cost, the screw only needs to provide the moving power, the performance requirement of the screw is reduced, and the design cost is further reduced. Therefore, the above design can ensure the moving precision and sufficient locking force while significantly reducing the cost.

[0009] As preferred, the fixed die component is a fixed tooth ring coaxially fixed on the screw, and the moving die component is a moving tooth ring sleeved on the screw, the teeth of the fixed tooth ring and the moving tooth ring are arranged on the side opposite to each other and uniformly distributed around the circumference of the screw, and the lock oil cylinder is uniformly and spacedly arranged around the circumference of the screw.

[0010] Adopting the above scheme, the teeth of the fixed tooth ring and the moving tooth ring are uniformly and spacedly distributed around the circumference, and the engagement precision can be designed by designing the number of teeth, when the moving tooth ring engages with the fixed tooth ring, the lock oil cylinder is uniformly and spacedly arranged two or more, which can ensure the stability and directivity of the moving tooth ring stretching and retracting, and the lock oil cylinder can simultaneously push the screw and the thrust seat to move during the extension process; during the retraction process of the lock oil cylinder, the thrust seat and the screw are first retracted a certain stroke through the lock oil cylinder, then the driving motor is started, the screw rotates to drive the nut to retract along the axial direction, and then the thrust seat is driven to move close to the tail plate along the axial direction of the screw until it moves to the initial position.

[0011] As preferred, the end of the moving tooth ring close to the tail plate is integrally provided with a guide sleeve matched with the tail plate in a guide plug-in manner.

[0012] Adopting the above scheme, the design of the guide sleeve can further increase the directivity of the moving tooth ring movement, and share the torque reaction of the screw rotation with the reaction force of the lock oil cylinder.

[0013] As preferred, after the moving tooth ring completely engages with the fixed tooth ring, there is a matching gap of 1.10-1.22 times the tooth thickness between the moving tooth ring and the pulling stop ring.

[0014] With the above scheme, the design of the connecting rod assembly and the thrust base is intended to increase the clamping force between the movable die plate and the fixed die plate after the mold is closed by using the force amplification ratio, in practice, the movement of the thrust base drives the movable die plate to move, and the movement distance of the movable die plate is greater than the thrust base. The cooperation gap is positively correlated with the movement stroke of the screw relative to the clamping oil cylinder. The greater the movable cooperation gap of the screw relative to the clamping oil cylinder, the greater the uncontrollable amplitude of the screw. When clamping, it is easy to cause a large impact between the movable die plate and the fixed die plate. Such impact is unavoidable, but it is necessary to reduce the amplitude and force of the impact. Tests show that when the cooperation gap is 1.10-1.22 times the tooth thickness, the movable gear ring and the fixed gear ring can be engaged or disengaged, and the impact amplitude and force between the movable die plate and the fixed die plate can be controlled within a controllable range.

[0015] As preferred, the fixed gear ring is fixed with the screw through the first flat key, and a limiting block ring is protruded on the screw and abuts against the side of the fixed gear ring away from the movable gear ring.

[0016] With the above scheme, after the gear ring and the screw are installed in key cooperation, the relative movement of the two in the circumferential and axial directions can be limited, and the limiting block ring can further increase the axial limiting force to resist the clamping force applied by the clamping oil cylinder.

[0017] As preferred, the rotating bearing is installed in the bearing seat, the side of the tail plate close to the thrust base is recessed with a guide groove concentric with the screw, the guide sleeve is inserted into the guide groove shaft, and the bearing seat is guided to slide in the guide groove between the guide sleeve and the bottom of the guide groove.

[0018] With the above scheme, only one guide groove is needed to guide the cooperation of the guide sleeve and the bearing seat.

[0019] As preferred, a synchronous driving assembly is arranged between the driving motor and the screw, the synchronous driving assembly includes a first synchronous wheel fixed on the motor shaft of the driving motor, a second synchronous wheel rotatably arranged on the side of the tail plate away from the thrust base and coaxial with the screw, and a synchronous belt tensioned on the first synchronous wheel and the second synchronous wheel. The center hole of the second synchronous wheel can pass through the screw, and a guide mechanism that limits the relative rotation of the center hole and the screw while allowing the relative movement of the center hole and the screw in the axial direction is arranged between the center hole and the screw.

[0020] As preferred, the guide structure includes a third key groove recessed in the end of the second synchronous wheel and communicated with the center hole, a fourth key groove opened in the axial direction of the screw at the end of the screw, and a second flat key inserted and cooperated with the third key groove and the fourth key groove. An end ring is fixed on the second synchronous wheel to limit the second flat key from leaving the third key groove and the fourth key groove.

[0021] Adopting the above scheme, the synchronous driving assembly is used for realizing synchronous operation of the driving motor and the lead screw, the design can avoid the problem of length increase of the machine body caused by the driving motor arranged at the end part, and can improve the stability of the driving motor installation, and the design of the guide mechanism can drive the lead screw to rotate synchronously when the second synchronous wheel rotates, and does not affect the displacement of the lead screw along the axial direction.

[0022] The utility model discloses a movable die plate moving process is mainly driven by screw rotation, when movable die plate moves to the specified position, lock -on oil cylinder piston rod stretches out, first makes mobile occlusion piece and fixed occlusion piece occlusion, makes the screw with lock -on oil cylinder connection, along with the piston rod's continuous stretch out, push screw, thrust base advance together, further make movable die plate and fixed die plate close and provide the required locking force of lock -on oil cylinder, lock -on oil cylinder in telescoping process, have independent lock -on and break -up function, and the function of background art's embracing oil cylinder, i. e. drive fixed occlusion piece and mobile occlusion piece occlusion to realize the connection function of lock -on oil cylinder and screw, make lock -on oil cylinder can carry screw and thrust base to the fixed die direction movement, further drive movable die to approach fixed die and realize lock -on, the above -mentioned structure, has dispensed with embracing oil cylinder, jamb and support's design, simplifies the structure, reduces the manufacturing difficulty simultaneously, shortens the length of machine body, further significantly reduced design cost, the stroke of oil cylinder is far shorter than the operation stroke of thrust base, further saves the operation cost and design cost, screw only needs to provide moving power, reduces the requirement to the performance of screw, further reduces design cost, therefore, the above -mentioned design guarantees the moving precision and the lock -on force of sufficient, and significantly reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the isometric view of an oil-electricity composite mold closing device of an injection molding machine of the embodiment;

[0024] Figure 2 is the front view of an oil-electricity composite mold closing device of an injection molding machine of the embodiment;

[0025] Figure 3 is Figure 2 the sectional view of A-A of

[0026] Figure 4 is Figure 3 the enlarged view of A of

[0027] Figure 5 is Figure 3 the enlarged view of B of

[0028] Figure 6 is the isometric view of a movable gear ring of the embodiment;

[0029] Figure 7 is the isometric view of a fixed gear ring of the embodiment;

[0030] Figure 8 is the front view of the mobile tooth ring and the fixed tooth ring of the embodiment when they are engaged.

[0031] The names of the parts referred to by the numbers in the above drawings are as follows: 1, fixed die plate; 2, tail plate; 201, guide groove; 3, movable die plate; 4, pull rod; 5, driving motor; 6, first synchronous wheel; 7, second synchronous wheel; 8, synchronous belt; 9, mold locking oil cylinder; 10, front connecting rod; 11, rear connecting rod; 12, split connecting rod; 13, thrust block; 14, nut; 15, lead screw; 16, third key groove; 17, fourth key groove; 18, second flat key; 19, sealing ring; 20, locking bolt; 21, fixed tooth ring; 211, first key groove; 22, mobile tooth ring; 23, guide sleeve; 231, guide section; 24, pulling stop ring; 25, limiting stop ring; 26, bearing block; 27, rotating bearing; 28, fit clearance; 29, first flat key. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and embodiments.

[0033] An oil-electric hybrid mold closing device of an injection molding machine, referring to Figures 1-2 As shown, it comprises a tail plate 2 and a fixed die plate 1 fixed on the machine body, a pull rod 4 is installed between the tail plate 2 and the fixed die plate 1, a movable die plate 3 is guided and moved between the fixed die plate 1 and the tail plate 2 through the pull rod 4, a thrust block 13 is arranged between the tail plate 2 and the movable die plate 3, the thrust block 13 is linked and connected with the tail plate 2 and the movable die plate 3 through a connecting rod assembly, the connecting rod assembly comprises front connecting rods 10 and rear connecting rods 11 hinged to each other, in the embodiment, three front connecting rods 10 are arranged above and below respectively, four rear connecting rods 11 are arranged above and below respectively, and the ends of the front connecting rods 10 and the rear connecting rods 11 away from each other are hinged to the movable die plate 3 and the tail plate 2 respectively, and each rear connecting rod 11 is hinged to a split connecting rod 12 near the tail plate 2, and the end of the split connecting rod 12 away from the rear connecting rod 11 is hinged to the thrust block 13, and the above structures are prior art.

[0034] An electrically driven mold-moving assembly is provided between the tail plate 2 and the thrust base 13. The electrically driven mold-moving assembly includes a set of lead screw pairs and a drive motor 5. The lead screw pairs include a lead screw 15 and a lead screw nut 14. The lead screw nut 14 is fixedly mounted on the thrust base 13 by bolts. One end of the lead screw 15 passes through the lead screw nut 14 and is screwed to the lead screw nut 14. The other end of the lead screw 15 is connected to the tail plate 2. A guide groove 201 is recessed at the center of the end of the tail plate 2 facing the thrust base 13. A bearing seat 26 is guided to move within the guide groove 201. A rotating bearing 27 is mounted on the bearing seat 26. The lead screw 15 is located away from the lead screw nut 14. The end passes through the rotating bearing 27. The inner ring of the lead screw 15 and the rotating bearing 27 are restricted from relative rotation by splines. The axial movement of the rotating bearing 27 relative to the lead screw 15 is restricted by setting snap rings at both ends of the rotating bearing 27 on the lead screw 15. The connection method between the rotating bearing 27 and the lead screw 15 is the prior art. This embodiment only shows one implementation method, which is not shown in the figure. The assembly of the lead screw 15 and the rotating bearing 27 allows the lead screw 15 to rotate relative to the bearing seat 26. Therefore, the lead screw 15 can both rotate and reciprocate along its own axis relative to the tail plate 2.

[0035] The drive motor 5 is either a servo motor or a stepper motor, and it is fixedly mounted on one side of the tailplate 2. See details. Figure 1 As shown, the lead screw 15 is driven to rotate by a synchronous drive assembly. The synchronous drive assembly includes a first synchronous pulley 6 fixed on the motor shaft of the drive motor 5, a second synchronous pulley 7 rotatably disposed on the side of the tail plate 2 away from the thrust seat 13 and coaxial with the lead screw 15, and a synchronous belt 8 tensioned on the first and second synchronous pulleys 6 and 7. The diameter of the second synchronous pulley 7 is larger than that of the first synchronous pulley 6. This design can achieve the effect of saving effort and reduce the power requirements of the drive motor 5. The center hole of the second synchronous pulley 7 allows the lead screw 15 to pass through, and a guide mechanism is provided between the center hole and the lead screw 15 to restrict their relative rotation while enabling their relative movement along the axial direction. Figures 3-4 As shown, the guide structure includes a third keyway 16 recessed at the end of the second synchronous pulley 7 away from the tail plate 2 and communicating with the central hole, a fourth keyway 17 opened at the end of the lead screw 15 along the axial direction of the lead screw 15, and a second flat key 18 that is simultaneously inserted and engaged with the third keyway 16 and the fourth keyway 17. A sealing ring 19 is fixed on the second synchronous pulley 7 by a locking bolt 20 to prevent the second flat key 18 from disengaging from the third keyway 16 and the fourth keyway 17. The guide structure is designed to accommodate the reciprocating motion of the lead screw 15 along its axial direction.

[0036] An oil-driven mold-locking assembly is installed between the tail plate 2 and the lead screw 15, combined with... Figures 5-8As shown, the oil-driven locking mode assembly comprises a fixed gear ring 21 fixed on the lead screw 15 through a first flat key 29, a movable gear ring 22 sleeved on the lead screw 15 and located between the tail plate 2 and the fixed gear ring 21, and locking mode oil cylinders 9 fixed on the tail plate 2. The teeth of the fixed gear ring 21 and the movable gear ring 22 are uniformly distributed in interval and have uniform thickness. The teeth of the two are arranged on the sides opposite to each other and are uniformly and spacedly distributed around the circumference of the lead screw 15. The cylinder body of the locking mode oil cylinder 9 is fixed on the tail plate 2 by screws. The locking mode oil cylinder 9 is provided with two and is symmetrically arranged around the circumference of the lead screw 15. The piston rod of the locking mode oil cylinder 9 is fixedly connected to the side of the movable gear ring 22 away from the teeth through screws after passing through the rear end of the tail plate 2. The side of the movable gear ring 22 away from the fixed gear ring 21 integrally extends a guide sleeve 23 which is insertedly matched with the guide groove 201. The outer wall of the guide sleeve 23 is symmetrically provided with a guide surface 231 which is guideingly insertedly matched with the guide groove 201.

[0037] A first key groove 211 is formed in the inner hole of the fixed gear ring 21 along the axial direction thereof. A second key groove is formed in the lead screw 15 along the axial direction thereof. The first flat key 29 is insertedly matched with the first key groove 211 and the second key groove in interference. A limiting stop ring 25 is protruded on the lead screw 15 and abuts against the side of the fixed gear ring 21 away from the movable gear ring 22. A pulling stop ring 24 is fixed on the lead screw 15 at the end of the guide sleeve 23 away from the fixed gear ring 21. When the movable gear ring 22 is completely engaged with the fixed gear ring 21, there is a matching gap 28 between the pulling stop ring 24 and the guide sleeve 23. The matching gap 28 is 1.10-1.22 times the thickness of the teeth of the fixed gear ring 21 and the movable gear ring 22. The matching gap 28 is positively correlated with the movement stroke of the lead screw 15 relative to the locking mode oil cylinder 9. The greater the matching gap 28 by which the lead screw 15 is movable relative to the locking mode oil cylinder 9, the greater the uncontrollable displacement of the lead screw 15. During the locking mode, a greater impact between the movable die plate 3 and the fixed die plate 1 is likely to occur. Such impact is unavoidable, but it is necessary to reduce the amplitude and intensity of the impact. Tests show that when the matching gap 28 is 1.10-1.22 times the thickness of the teeth, the movable gear ring 22 and the fixed gear ring 21 can be engaged or disengaged, and the impact amplitude and intensity between the movable die plate 3 and the fixed die plate 1 can be controlled within a controllable range.

[0038] The clamping and locking mode processes are as follows:

[0039] 1. The driving motor 5 is started, the lead screw 15 rotates, the nut 14 is driven away from the tail plate 2, and the movable die plate 3 is driven to move towards the fixed die plate 1 at a faster speed than the push rod 13 under the action of the connecting rod assembly.

[0040] 2. When the thrust base 13 moves to the designated position, the piston rod of the locking oil cylinder 9 extends, the moving gear ring 22 is close to and engaged with the fixed gear ring 21, the driving motor 5 stops, the lead screw 15, the lead nut 14 and the thrust base 13 move together with the piston rod to the direction of the fixed mold plate 1, the movable mold plate 3 is combined with the fixed mold plate 1 and locked.

[0041] The mold breaking and mold opening process is as follows:

[0042] 1. The piston rod of the locking oil cylinder 9 retracts, the moving gear ring 22 is against the pulling stop ring 24, the lead screw 15, the lead nut 14 and the thrust base 13 are pulled back by the locking oil cylinder 9;

[0043] 2. The driving motor 5 reverses, the lead screw 15 reverses, the lead nut 14 and the thrust base 13 continue to approach the tail plate 2 until the thrust base 13 approaches the tail plate 2 to the initial position (the movable mold plate 3 is away from the fixed mold plate 1 to the maximum distance).

[0044] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not only limited to the above-mentioned embodiments, all technical solutions belonging to the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, some improvements and decorations without departing from the principle of the utility model are also regarded as the protection scope of the utility model.

Claims

1. An oil-electric combined mold closing device of an injection molding machine, comprising a tail plate (2) and a fixed mold plate (1) fixedly arranged on a machine body, and a movable mold plate (3) guided to move between the tail plate (2) and the fixed mold plate (1), wherein a thrust seat (13) is arranged between the movable mold plate (3) and the tail plate (2), and the thrust seat (13) is connected with the tail plate (2) and the movable mold plate (3) through a connecting rod assembly, characterized in that: An electric drive mold moving assembly is arranged between the tail plate (2) and the thrust base (13), the electric drive mold moving assembly comprises a nut (14) fixedly installed on the thrust base (13), a lead screw (15) connected with the nut (14) at one end and connected with the tail plate (2) at the other end, the lead screw (15) is rotatably connected with the tail plate (2) through a rotating bearing (27) and can relatively reciprocate along the axial direction of the lead screw (15), an oil drive mold locking assembly is arranged between the tail plate (2) and the lead screw (15), the oil drive mold locking assembly comprises a fixed engagement member fixed on the lead screw (15), a mold locking oil cylinder (9) fixed on the tail plate (2), and a movable engagement member fixed on the piston rod end of the mold locking oil cylinder (9) and engaged or disengaged with the fixed engagement member along with the extension and contraction of the piston rod, and a pulling stop ring (24) is fixed on the lead screw (15) at the end away from the movable engagement member.

2. The hydraulic / electric combined clamp apparatus of claim 1 wherein: The fixed engagement member is a fixed tooth ring (21) coaxially fixed on the lead screw (15), and the movable engagement member is a movable tooth ring (22) sleeved on the lead screw (15), the teeth of the fixed tooth ring (21) and the movable tooth ring (22) are arranged on the side opposite to each other and uniformly and spacedly distributed around the circumference of the lead screw (15), and the mold locking oil cylinder (9) is uniformly and spacedly arranged around the circumference of the lead screw (15).

3. The hydraulic / electric clamp system for an injection molding machine of claim 2 wherein: The end of the movable tooth ring (22) close to the tail plate (2) integrally protrudes a guide sleeve (23) which is guided and inserted into the tail plate (2).

4. The hydraulic / electric clamp system for an injection molding machine of claim 2 wherein: After the movable tooth ring (22) is completely engaged with the fixed tooth ring (21), there is a matching gap (28) of 1.10-1.22 times the tooth thickness between the movable tooth ring (22) and the pulling stop ring (24).

5. The hydraulic / electric clamp system for an injection molding machine of claim 2 wherein: The fixed tooth ring (21) is fixed with the lead screw (15) through a first flat key (29), and a limiting stop ring (25) is protruded on the lead screw (15) and abuts against the side of the fixed tooth ring (21) away from the movable tooth ring (22).

6. The hydraulic / electric clamp system for an injection molding machine of claim 3 wherein: The rotating bearing (27) is installed in a bearing seat (26), the side of the tail plate (2) close to the thrust base (13) is recessed with a guide groove (201) concentric with the lead screw (15), the guide sleeve (23) is guided and inserted into the guide groove (201), and the bearing seat (26) is guided and slides in the guide groove (201) and is located between the guide sleeve (23) and the bottom of the guide groove (201).

7. The hydraulic / electric clamp apparatus of claim 6 wherein: A synchronous drive assembly is arranged between the driving motor (5) and the lead screw (15), the synchronous drive assembly comprises a first synchronous wheel (6) fixed on the motor shaft of the driving motor (5), a second synchronous wheel (7) rotatably arranged on the side of the tail plate (2) away from the thrust base (13) and coaxial with the lead screw (15), and a synchronous belt (8) tensioned on the first synchronous wheel (6) and the second synchronous wheel (7), the center hole of the second synchronous wheel (7) can pass through the lead screw (15), and a guide mechanism is arranged between the center hole and the lead screw (15) to limit the relative rotation of the two while allowing the relative movement of the two in the axial direction.

8. The hydraulic / electric clamp apparatus of claim 7 wherein: The guide structure comprises a third key groove (16) recessed on the second synchronizing wheel (7) at the end away from the tail plate (2) and communicating with the central hole, a fourth key groove (17) opened along the axial direction of the lead screw (15) at the end of the lead screw (15), and a second flat key (18) simultaneously inserted into the third key groove (16) and the fourth key groove (17), and an enclosing ring (19) is fixed on the second synchronizing wheel (7) to limit the second flat key (18) from being separated from the third key groove (16) and the fourth key groove (17).

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