An electric injection molding device for an injection molding machine

Abstract

The present invention belongs to the field of injection molding machines, and specifically relates to an electric injection molding device for injection molding machines, comprising: an injection seat, the upper end of which is slidably connected to a pre-plastic seat; a pre-plastic assembly, the end of which is provided with a pre-plastic bearing, and the pre-plastic bearing is movably connected to the pre-plastic seat; a lead screw assembly, one end of which is connected to the injection seat, the end of the lead screw assembly is provided with a connecting portion, the connecting portion is provided with a spherical roller bearing, and the spherical roller bearing is movably inserted in the pre-plastic bearing; when the lead screw assembly rotates, it can drive the pre-plastic bearing to move forward and backward relative to the injection seat. Compared with the prior art, the advantage of the present invention is that the electric injection molding device for injection molding machines only needs one pre-plastic bearing to connect the lead screw and the pre-plastic assembly, which saves the space occupied by the injection device, reduces the internal parts of the injection device, and reduces the cost. The lead screw relies on a deep groove ball bearing and a spherical roller bearing for centering and maintaining the lead screw angle, respectively, to ensure that the lead screw angle will not deviate, meeting the injection molding requirements.

Description

Technical Field

[0001] The invention belongs to the field of injection molding machines, and in particular relates to an electric injection molding device used for an injection molding machine. Background Art

[0002] At present, electric injection devices all use motors to drive the lead screw, which converts the rotational motion of the motor rotor into the linear feed motion of the related machinery to achieve injection and ejection. The lead screw is provided with radial positioning support by the support bearing unit, and bears the axial injection and ejection forces. The plasticizing function of the electric injection device is driven by the motor to rotate the screw through the transmission device. The two systems use different power motors, separate actions, and have different bearing support units. The pre-plasticization and injection actions are respectively realized by two sets of motors and two sets of bearings. In the actual practical process, the angle of the lead screw is prone to deviation. This setting makes it difficult to adjust the lead screw, and the cost of the injection device is high and the floor space is relatively large. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an electric injection molding device for an injection molding machine in view of the current status of the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: an electric injection molding device for an injection molding machine is provided, comprising: an injection seat, the upper end of which is slidably connected to a pre-molding seat;

[0005] A pre-plasticizing component, wherein a pre-plasticizing bearing is disposed at the end of the pre-plasticizing component, and the pre-plasticizing bearing is movably connected to the pre-plasticizing seat;

[0006] A screw assembly, one end of which is connected to the injection seat, the end of the screw assembly is provided with a connecting portion, the connecting portion is provided with a spherical roller bearing, and the spherical roller bearing is movably inserted in the pre-plastic bearing;

[0007] When the screw assembly rotates, it can drive the pre-molded bearing to move forward and backward relative to the injection seat.

[0008] In the above-mentioned electric injection molding device for an injection molding machine, the pre-plastic bearing includes a coupling and a transition coupling, the coupling and the transition coupling are detachably connected, the connecting part movably passes through the transition coupling, and the outer wall of the spherical roller bearing is connected to the inner wall of the transition coupling.

[0009] In the above-mentioned electric injection molding device for an injection molding machine, the pre-plasticizing assembly comprises: a screw, the end of which is connected to the coupling;

[0010] A pre-plasticizing pulley, which is fixedly sleeved on the screw;

[0011] A pre-plasticizing motor is arranged on the injection seat, and the pre-plasticizing motor is connected to the pre-plasticizing pulley through a belt.

[0012] In the above-mentioned electric injection molding device for an injection molding machine, the pre-plastic seat is sleeved on the coupling, one end of the pre-plastic seat extends toward the transition coupling, and the first tapered roller bearing and the second tapered roller bearing are respectively arranged at both ends of the pre-plastic seat, the first tapered roller bearing abuts against the outer side of the coupling, and the second tapered roller bearing abuts against the outer side of the transition coupling, and the first bearing cover and the second bearing cover are respectively arranged at both ends of the pre-plastic seat, the first bearing cover abuts against the end of the coupling, and the second bearing cover abuts against the end of the transition coupling.

[0013] In the above-mentioned electric injection molding device for an injection molding machine, the screw assembly comprises: a screw, the connecting portion is arranged at the front end of the screw, and the rear end of the screw is threadedly connected to the injection seat;

[0014] An injection pulley, which is sleeved on the lead screw;

[0015] An injection motor is arranged on the injection seat, and the injection motor is connected to the injection pulley through a belt.

[0016] In the above-mentioned electric injection molding device for an injection molding machine, a lead screw nut is provided on the injection seat, and the lead screw is threadedly connected to the lead screw nut.

[0017] In the above-mentioned electric injection molding device for an injection molding machine, a fixing plate is arranged on the injection seat, a pressure sensor is arranged on the fixing plate, and the pressure sensor is connected to the lead screw.

[0018] In the above-mentioned electric injection molding device for an injection molding machine, the lead screw movably passes through the second bearing cover.

[0019] In the above-mentioned electric injection molding device for an injection molding machine, a deep groove ball bearing is sleeved on the lead screw, and the outer side wall of the deep groove ball bearing movably abuts against the inner side wall of the transition coupling.

[0020] Compared with the prior art, the advantage of the present invention is that the electric injection molding device for the injection molding machine only needs one pre-molding bearing to connect the lead screw and the pre-molding component, which saves the space occupied by the injection device, reduces the internal parts of the injection device, and reduces the cost. The lead screw relies on a deep groove ball bearing and a spherical roller bearing for centering and maintaining the lead screw angle, ensuring that the lead screw angle will not deviate and meet the injection molding requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the electric injection molding device for the injection molding machine;

[0022] Figure 2 It is a top view of the electric injection molding device for the injection molding machine;

[0023] In the figure, 1. injection seat; 2. pre-plastic seat; 3. spherical roller bearing; 4. connecting part; 5. coupling; 6. transition coupling; 7. screw; 8. pre-plastic pulley; 9. pre-plastic motor; 11. first tapered roller bearing; 12. second tapered roller bearing; 13. first bearing gland; 14. second bearing gland; 15. lead screw; 16. injection pulley; 17. injection motor; 18. lead screw nut; 19. fixing plate; 20. pressure sensor; 21. deep groove ball bearing. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 and Figure 2 As shown, the electric injection molding device for the injection molding machine includes: an injection seat 1, the upper end of which is slidably connected to a pre-plasticizing seat; a pre-plasticizing component, the end of which is provided with a pre-plasticizing bearing, and the pre-plasticizing bearing is movably connected to the pre-plasticizing seat; a screw assembly, which is threadedly connected to the injection seat 1, and the end of the screw assembly is provided with a connecting portion 4, and the connecting portion 4 is provided with a spherical roller bearing 3, the spherical roller bearing 3 is inserted in the pre-plasticizing bearing, and the outer wall of the spherical roller bearing 3 is connected to the inner wall of the pre-plasticizing bearing.

[0026] The preplastic seat can move forward and backward on the injection seat 1. A preplastic bearing is provided at the end of the preplastic assembly. When the preplastic seat 2 moves forward and backward, it can drive the preplastic assembly to move forward and backward to realize actions such as injection and ejection. One end of the screw assembly is movably connected to the injection seat 1. Because the injection seat 1 is fixed, when the screw assembly rotates, it can drive the preplastic assembly to move. When the preplastic assembly is working, the preplastic bearing rotates. At this time, the preplastic bearing rotates relative to the screw assembly, and will not drive the screw assembly to rotate. In this way, the screw assembly can be ensured to be in a stationary state, thereby achieving the purpose of separate preplasticization.

[0027] During the rotation of the screw assembly, the connecting part 4 can rotate in the pre-molded bearing, because the connecting part 4 is provided with a spherical roller bearing 3, and the outer wall of the spherical roller bearing 3 is connected to the inner wall of the pre-molded bearing, so that the spherical roller bearing 3 can keep the connecting part 4 at the center position in the pre-molded bearing at all times, thereby ensuring that the angle between the screw assembly and the pre-molded does not change at all times, ensuring the injection molding accuracy, and preventing the screw 15 from breaking due to excessive torque between the screw 15 and the pre-molded bearing after the angle is offset, thereby greatly improving the service life of the injection molding device, and in this injection molding device, only the screw assembly needs to be connected to the pre-molded assembly, and only a single pre-molded bearing needs to be used at the connection between the two, and there is no need to set a load-bearing bearing at the other end of the screw assembly, which greatly reduces the support cost and floor space of the device.

[0028] The pre-plastic bearing comprises a coupling 5 and a transition coupling 6. The coupling 5 and the transition coupling 6 are detachably connected. The connecting portion 4 movably penetrates the transition coupling 6. The outer wall of the spherical roller bearing 3 is connected to the inner wall of the transition coupling 6.

[0029] The coupling 5 and the transition coupling 6 are connected by splines. This connection method is convenient for disassembling and assembling the coupling 5 and the transition coupling 6. As the use time of the injection molding device increases, the wear of the spherical roller bearing 3 will cause its internal clearance to be too large. At this time, the spherical roller bearing 3 needs to be replaced. Because the outer wall of the spherical roller bearing 3 is connected to the inner wall of the pre-plasticized bearing, it is necessary to start from the inside of the pre-plasticized bearing when replacing it. The coupling 5 and the transition coupling 6 are detachably connected. In actual practical use, the spherical roller bearing 3 inside can be replaced by removing the transition coupling 6, which is more convenient.

[0030] The pre-plasticizing component comprises: a screw 7, an end of which is connected to a coupling 5; a pre-plasticizing pulley 8, which is fixedly sleeved on the screw 7; a pre-plasticizing motor 9, which is arranged on the pre-plasticizing seat 2, and the pre-plasticizing motor 9 is connected to the pre-plasticizing pulley 8 through a belt.

[0031] The pre-plasticizing motor 9 can drive the pre-plasticizing pulley 8 to rotate through a belt, because the pre-plasticizing pulley 8 is sleeved on the screw 7, and then when the pre-plasticizing pulley 8 rotates, it can drive the screw 7 to rotate to realize the pre-plasticizing work. The end of the screw 7 is connected to the coupling 5. When the screw assembly works, it can drive the pre-plasticizing seat 2 to move radially, and then drive the screw 7 to move radially to realize the injection molding action.

[0032] The pre-plasticizing seat 2 is sleeved on the coupling 5, and one end of the pre-plasticizing seat 2 extends toward the transition coupling 6. The first tapered roller bearing 11 and the second tapered roller bearing 12 are respectively arranged at both ends of the pre-plasticizing seat 2. The first tapered roller bearing 11 abuts against the outer side of the coupling 5, and the second tapered roller bearing 12 abuts against the outer side of the transition coupling 6. The first bearing pressure cover 13 and the second bearing pressure cover 14 are respectively arranged at both ends of the pre-plasticizing seat 2. The first bearing pressure cover 13 abuts against the end of the coupling 5, and the second bearing pressure cover 14 abuts against the end of the transition coupling 6.

[0033] The coupling 5 and the transition coupling 6 are detachably connected. The connecting portion 4 of the screw 15 is connected to the transition coupling 6 through the spherical roller bearing 3. When the screw 15 rotates and drives the transition coupling 6 to move radially, the coupling 5 will be subjected to radial tension, which can easily cause the coupling 5 and the transition coupling 6 to separate. The pre-plastic seat 2 is sleeved on the coupling 5 and extends toward the transition coupling 6. The first bearing pressure cover 13 and the second bearing pressure cover 14 are respectively provided at both ends of the sealing barrel. The first bearing pressure cover 13 abuts against the end of the coupling 5, and the second bearing pressure cover 14 abuts against the end of the transition coupling 6. That is, when the coupling 5 or the transition coupling 6 is subjected to tension, the sealing barrel, the first bearing pressure cover 13 and the second bearing pressure cover 14 can play a stabilizing role to ensure the coupling There will be no separation between the joint 5 and the transition coupling 6. The first tapered roller bearing 11 and the second tapered roller bearing 12 are respectively arranged at both ends of the pre-plasticizing seat 2. The first tapered roller bearing 11 abuts against the outer side of the coupling 5, and the second tapered roller bearing 12 abuts against the outer side of the transition coupling 6. Since one end of the screw 7 is connected to the coupling 5, when the pre-plasticizing pulley 8 drives the screw 7 to rotate, the coupling 5 and the transition coupling 6 will rotate. At this time, the first tapered roller bearing 11 and the second tapered roller bearing 12 can reduce the friction between the coupling 5, the transition coupling 6 and the pre-plasticizing seat 2, and improve their service life. In addition, the first tapered roller bearing 11 and the second tapered roller bearing 12 can ensure that the angles of the coupling 5 and the transition coupling 6 remain unchanged during rotation.

[0034] The screw assembly includes: a screw 15, a connecting part 4 is arranged at the front end of the screw 15, and the rear end of the screw 15 is threadedly connected to the injection seat 1; an injection pulley 16, which is sleeved on the screw 15; an injection motor 17, which is arranged on the pre-plastic seat 2, and the injection motor 17 is connected to the injection pulley 16 through a belt.

[0035] The injection pulley 16 can be driven to rotate by the injection motor 17. When the injection pulley 16 rotates, it can drive the screw 15 to rotate. One end of the screw 15 is threadedly connected to the injection seat 1, so that the screw 15 can move forward and backward relative to the injection seat 1, that is, it can drive the pre-plastic seat 2 to move forward and backward.

[0036] A lead screw nut 18 is provided on the injection seat 1 , and the lead screw 15 is threadedly connected to the lead screw nut 18 .

[0037] A fixed plate 19 is provided on the injection seat 1, and a pressure sensor 20 is provided on the fixed plate 19. The pressure sensor 20 is connected to the lead screw 15. When the lead screw 15 moves forward and backward, the pressure sensor 20 can detect the pulling force of the lead screw 15 according to the different moving distances of the lead screw 15 to ensure that the forward or backward distance of the lead screw 15 meets the requirements.

[0038] A deep groove ball bearing 21 is sleeved on the lead screw 15 , and the outer wall of the deep groove ball bearing 21 movably abuts against the inner wall of the transition coupling 6 .

[0039] The deep groove ball bearing 21 can play a centering role for the threaded spindle 15 during installation of the threaded spindle 15 and during rotation of the threaded spindle 15 .

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. An electric injection molding device for an injection molding machine, characterized in that: include: An injection seat, the upper end of which is slidably connected to a pre-plastic seat; A pre-plasticizing component, wherein a pre-plasticizing bearing is disposed at the end of the pre-plasticizing component, and the pre-plasticizing bearing is movably connected to the pre-plasticizing seat; A screw assembly, one end of which is connected to the injection seat, the end of the screw assembly is provided with a connecting portion, the connecting portion is provided with a spherical roller bearing, and the spherical roller bearing is movably inserted in the pre-plastic bearing; When the lead screw assembly rotates, it can drive the pre-molded bearing to move forward and backward relative to the injection seat; The pre-plastic bearing comprises a coupling and a transition coupling, the coupling is detachably connected to the transition coupling, the connecting portion movably penetrates the transition coupling, and the outer side wall of the spherical roller bearing is connected to the inner side wall of the transition coupling; The pre-plastic assembly comprises: a screw, the end of which is connected to the coupling; A pre-plasticizing pulley connected to the screw; A pre-plasticizing motor, which is arranged on the pre-plasticizing seat, and the pre-plasticizing motor is connected to the pre-plasticizing pulley through a belt; The screw assembly comprises: a screw, the connecting portion is arranged at the front end of the screw, and the rear end of the screw is movably connected to the injection seat; An injection pulley, which is sleeved on the lead screw; An injection motor, which is arranged on the pre-plastic seat, and the injection motor is connected to the injection pulley through a belt; A deep groove ball bearing is sleeved on the lead screw, and the outer side wall of the deep groove ball bearing movably abuts against the inner side wall of the transition coupling.

2. The electric injection molding device for an injection molding machine according to claim 1, characterized in that: The pre-plastic seat sleeve is arranged on the coupling. A pre-plastic seat is provided on the coupling, one end of the pre-plastic seat extends toward the transition coupling, and the first tapered roller bearing and the second tapered roller bearing are respectively provided at both ends of the pre-plastic seat, the first tapered roller bearing abuts against the outer side of the coupling, and the second tapered roller bearing abuts against the outer side of the transition coupling, and the first bearing pressure cover and the second bearing pressure cover are respectively provided at both ends of the pre-plastic seat, the first bearing pressure cover abuts against the end of the coupling, and the second bearing pressure cover abuts against the end of the transition coupling.

3. The electric injection molding device for an injection molding machine according to claim 1, characterized in that: A lead screw nut is provided on the injection seat, and the lead screw is threadedly connected with the lead screw nut.

4. The electric injection molding device for an injection molding machine according to claim 1, characterized in that: A fixing plate is arranged on the injection seat, a pressure sensor is arranged on the fixing plate, and the pressure sensor is connected to the lead screw.

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