CN210759039U - Injection molding machine and electric injection device thereof - Google Patents

Abstract

The utility model discloses an injection molding machine and an electric injection device thereof, which comprises a base, a pull rod group and a driving mechanism, wherein a lead screw component is driven by a second belt wheel and forces an injection seat to displace along the axial direction of the pull rod group; wherein the meshing has the second hold-in range on the two adjacent second wheel hubs, improves injection speed through the drive mode that adopts two motor and two lead screws, and the synchronism of two lead screws utilizes the second hold-in range to mesh in two second band pulleys and can promote, and then has improved the stability that the injection seat moved the in-process, can also have better injection quality under having higher injection speed, reduces the extrusion wear between lead screw and the injection seat simultaneously, the life of improvement device.

Description

Injection molding machine and electric injection device thereof

Technical Field

The utility model belongs to the technical field of injection moulding equipment's technique and specifically relates to an injection molding machine and electronic injection device thereof is related to.

Background

An injection molding machine is a molding device for making thermoplastic plastics or thermosetting plastics into plastic products with various shapes by utilizing a plastic molding die. The injection system is one of the most important components of an injection molding machine and has the function of injecting molten plastic into a mold cavity through a screw at a certain pressure and speed after a certain amount of plastic is heated and plasticized within a specified time in one cycle of the injection molding machine.

The injection system has electric and hydraulic driving modes, and the electric injection device is widely used at present because of better controllability and injection precision. In the working process of the electric injection device, the servo motor drives the screw rod to rotate, the screw rod drives the injection seat to move through the matched nut, and the injection seat drives the screw rod to axially move to realize injection operation.

In order to improve the injection efficiency and improve the injection speed, an electric injection device driven by a double lead screw appears on the market to meet the requirement of high-speed injection. For example, patent publication No. CN103182769A discloses an all-electric ultra-high-speed injection molding machine, which employs two injection servo motors, each of which drives a lead screw to rotate, and the two lead screws drive an injection seat to move, so as to realize injection.

Although the above patent can achieve the purpose of high-speed injection, the injection driving mode of the double screw rods needs to ensure that the double screw rods have better rotation synchronism, and the existing operation is to carry out repeated debugging on two servo motors to ensure the synchronism during working, but in the actual working process, the ideal synchronous state is difficult to achieve, and the injection quality is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first purpose provides an electronic injection device, the synchronism when keeping two lead screws rotation that can be better improves injection quality and life.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

an electric injection device comprising:

a base including a front plate and a tail plate spaced from the front plate by a certain distance;

the pull rod group is connected between the front plate and the tail plate;

the injection seat is arranged between the front plate and the tail plate and is connected with the pull rod set in a sliding manner;

the driving mechanism comprises a first driving component and a second driving component which have the same structure, and the first driving component and the second driving component respectively comprise a first servo motor arranged on the tail plate, a first belt wheel connected to the first servo motor, a second belt wheel and a first synchronous belt meshed with the first belt wheel and the second belt wheel; and the number of the first and second groups,

one end of each of the two lead screw assemblies is correspondingly connected to the first driving assembly and the second driving assembly respectively, the other end of each of the two lead screw assemblies is connected to the injection seat, and the lead screw assemblies are driven by the second belt wheel and force the injection seat to displace along the axial direction of the pull rod group;

the second belt wheel comprises a first hub meshed with the first synchronous belt and a second hub adjacent to the first hub, and the two adjacent second hubs are meshed with the second synchronous belt.

By adopting the technical scheme, the injection seat is driven to slide by the two groups of screw rod assemblies, and the pull rod assembly plays a role in guiding the sliding of the injection seat to displace in a designed injection molding path, so that the injection accuracy is improved, and the injection quality is improved; two sets of screw assemblies respectively utilize first drive assembly and second drive assembly to carry out drive work, specifically rotate through two first servo motor and utilize first synchronous belt drive second band pulley to rotate, drive screw assembly work respectively when two second band pulleys rotate, the synchronism during two screw assemblies work mainly depends on the synchronism of two second band pulley rotations, and in order to guarantee the synchronism during two second band pulley rotations, the second hold-in range has additionally been add, utilize the second hold-in range to engage make two second band pulleys can calibrate on two second wheel hubs, realize the rotation synchronism of two second band pulleys, and then better assurance the synchronism of two screw assemblies during operation, improve the stability when driving the injection seat, reduce the moment of torsion that the injection seat produced when two screw assemblies synchronism are poor simultaneously, promote whole injection apparatus's life. And the moment of torsion of injection seat in the displacement process mainly derives from two sets of screw assemblies when the drive injection seat, and the left and right displacement volume inequality of injection seat forms, and the synchronism of two sets of screw assemblies during operation is worse, and the torque volume just is big more, and is just big more to the wearing and tearing volume of injection seat and screw assembly, and life just is low more, and the better great problem of the big moment of torsion volume of alleviating injection seat displacement process of the design of this scheme.

Preferably, the device further comprises a tensioning assembly, wherein the tensioning assembly comprises a tensioning wheel, and the tensioning wheel is arranged between the two second belt pulleys; the tensioning wheel can displace along the vertical direction of a circle center connecting line of the two second belt wheels, and the smooth surface of the second synchronous belt is always attached to the tensioning wheel.

By adopting the technical scheme, the tensioning assembly is mainly used for adjusting the tension degree of the second synchronous belt, and the tension is realized by adjusting the tensioning wheel to act on the second synchronous belt along the vertical direction of the connecting line of the circle centers of the two second belt wheels, so that the second synchronous belt generates compression deformation with different degrees, the friction force between the tooth surface of the second synchronous belt and the second wheel hub is increased, the slip between the second synchronous belt and the second belt wheels is reduced, the rotation synchronism between the two second belt wheels is improved, the stable displacement of the injection seat is better driven, the torque amount in the moving process of the injection seat is reduced, and the service life of the device is prolonged; secondly, the tension pulley applies force to a smooth surface of the second synchronous belt, the smooth surface is one side of the opposite tooth surface, so that the tension pulley does not need to be toothed on the surface, and the smooth surfaces are matched, thereby reducing the processing requirement on the tension pulley and reducing the manufacturing cost; meanwhile, when the second synchronous belt is meshed with the two second belt wheels, the two second belt wheels are inevitably tensioned by the second synchronous belt, so that the two second belt wheels have opposite movement trends, the larger the movement trend is, the larger the extrusion wear degree between the screw rod assembly and other components is, when the tensioning wheel applies force to the second synchronous belt, the two second belt wheels generate tilting force to force the two second belt wheels to have a downward inclined movement trend, but because the tensioning wheel applies force to the smooth surface of the second synchronous belt, relative to the tensioning mode of enabling the second synchronous belt to be stretched by acting on the tooth surface, the included angle between the tilting force direction and the horizontal plane is relatively smaller, the downward inclined movement trend between the two second belt wheels is smaller, and the extrusion wear between the screw rod assembly and other components can be reduced.

Preferably, the bearing component comprises a limiting wheel which is arranged on the second belt wheel and can rotate relative to the second belt wheel and a bearing plate arranged on the two limiting wheels.

Through adopting above-mentioned technical scheme, the loading board is connected two pulleys, transmits the bearing board through spacing round with the power in opposite directions that two pulleys received, has reduced the tensile force that two second pulleys received, utilizes the loading board to keep the interval between two second pulleys simultaneously, reduces because two second pulleys take place when moving in opposite directions, and improvement life and the stability of during operation with the extrusion wear between other parts.

Preferably, the screw assembly includes:

one end of the nut seat is connected with the injection seat;

the screw rod comprises a threaded section in threaded connection with the nut seat and an optical axis section extending from one end of the threaded section to one side of the tail plate, and the optical axis section is connected with the second belt wheel; and the number of the first and second groups,

the bearing block is arranged in the tail plate and is provided with a bearing cavity, and at least one first angular contact ball bearing and an adjacent second angular contact ball bearing are arranged in the bearing cavity;

the first angular contact ball bearing and the second angular contact ball bearing are both sleeved on the optical shaft section, the stress direction of the first angular contact ball bearing is opposite to the injection direction, the stress direction of the second angular contact ball bearing is the same as the injection direction, and the number of the first angular contact ball bearings is larger than that of the second angular contact ball bearings.

By adopting the technical scheme, the rotation of the second belt wheel drives the screw rod to rotate, the rotation of the screw rod drives the nut seat to displace along the axial direction of the screw rod, the nut seat is connected with the injection seat to further drive the injection seat to move, and injection operation is realized; secondly, the number of the first angular contact ball bearings is larger than that of the second angular contact ball bearings, so that the axial loads of different sizes on the lead screw are matched; in addition, the optical axis section and the second band pulley of lead screw are connected, and whole bearing frame also sets up in tailboard one side, improve the support intensity of lead screw and second band pulley junction, and the lead screw is kept away from the one end of optical axis section and is connected with the injection seat, support the lead screw through the injection seat, come whole stability when promoting the lead screw installation, support stability the prerequisite to the lead screw satisfying, can shorten the length of whole lead screw, reduce manufacturing cost, and the one end of lead screw only has the connection with the tailboard, be connected with the front bezel, can reduce the atress of front bezel, improve the life of whole base.

Preferably, the injection seat comprises:

a movable plate;

one end of the stress plate is connected to the movable plate, and a force sensor is arranged in the stress plate; and the number of the first and second groups,

the thrust plate is connected to one end face, far away from the movable plate, of the stress plate;

the movable plate and the thrust plate are connected to the pull rod group in a sliding mode, and one end of the screw rod assembly is connected with the thrust plate.

Through adopting above-mentioned technical scheme, on two sets of lead screw assemblies all were connected to the thrust plate, the thrust plate received lead screw assembly's effort back, and the application of force gives the atress board, installs force sensor in the atress board, and force sensor converts the pressure of responding to into in the signal of telecommunication sends numerical control system, realizes the regulation to servo motor's output torque, satisfies injection pressure's requirement. Because the thrust plate is arranged to receive the acting force of the two groups of screw rod assemblies and act on the stress plate, the pressure received by the whole stress plate is a value, namely, the torque of the servo motor can be adjusted by accurately measuring the pressure only by arranging a force sensor, the injection quality is improved, and the structure is simplified.

Preferably, the stress plate includes a first convex ring and a second convex ring which are located on two end faces and concentrically arranged, the movable plate is provided with a first ring groove for the first convex ring to be clamped, the thrust plate is provided with a second ring groove for the second convex ring to be clamped, the first convex ring is circumferentially provided with a plurality of first mounting holes, and the second convex ring is circumferentially provided with second mounting holes; wherein the radius of the first convex ring is not equal to the radius of the second convex ring.

Through adopting above-mentioned technical scheme, the both ends face of atress board is connected respectively on movable plate and thrust plate, the setting of first bulge loop and second bulge loop is convenient for quick and is fixed a position with movable plate and thrust plate, secondly first bulge loop and second bulge loop are cyclic annular and both are the concentric setting, the area of contact between atress board and movable plate and the thrust plate has been increased, precision when improving the dynamometry, and radius inequality between first bulge loop and the second bulge loop, make the atress board receive and produce the interval between the loading force of thrust plate and the loading force that the atress board received the movable plate, make the atress board produce a moment of torsion, increase the deflection of atress board, enlarge the atress, improve force sensor's detection precision, make the moment of torsion accuse output that can more accurate control servo motor, improve the injection quality.

Preferably, the pull rod group comprises a first pull rod and a second pull rod, the front plate is provided with a cylinder hole, the first pull rod and the second pull rod are diagonally arranged between the front plate and the rear plate, and a circle center connecting line of the first pull rod and the second pull rod and the cylinder hole is on the same straight line.

Through adopting above-mentioned technical scheme, first pull rod and second pull rod provide the guidance quality when injecting the seat and sliding, and when arranging first pull rod and second pull rod, adopted oblique diagonal to arrange, and both are in a straight line with the centre of a circle in barrel hole for when injecting the seat and taking place the displacement, first pull rod draws sweat with the second and can offset the moment of torsion of front bezel and tailboard, promotes the stability and the life of whole base.

Preferably, the device further comprises a limiting assembly, wherein the limiting assembly comprises:

the hoop is sleeved on the first pull rod and the second pull rod, and one end of the hoop is abutted against the front plate; and the number of the first and second groups,

one end of the limiting rod is connected to the injection seat, and the other end of the limiting rod extends towards the tail plate.

Through adopting above-mentioned technical scheme, spacing subassembly is used for realizing the spacing of injection seat displacement from beginning to end, and the staple bolt is used for spacing injection seat at the biggest stroke of injection in-process, and the gag lever post is used for the biggest spacing when spacing injection seat rolls back, and then has realized the injecing to injection seat round trip stroke, improves the security of during operation.

Preferably, the base is integrally arranged, the injection device further comprises a bottom plate connected with the front plate and the tail plate, two parallel linear guide rails are mounted on the bottom plate, and a sliding block matched with the linear guide rails is arranged at the bottom of the injection seat.

By adopting the technical scheme, the integral base improves the overall strength, and when the injection seat slides to the first pull rod and the second pull rod, the whole base can be stressed, so that the supporting strength is improved; secondly, the injection seat improves the guidance quality of the injection seat during displacement through the matching between the sliding block and the linear guide rail, and the weight of the injection seat is borne on the bottom plate through the linear guide rail, so that the possibility that the pull rod group deforms due to the weight of the injection seat is reduced, and the service life of the whole device is prolonged better.

Preferably, the injection device further comprises an injection mechanism, the injection mechanism comprising:

one end of the machine barrel is connected with the front plate, and an injection screw is arranged in the machine barrel;

the rotating hub is partially accommodated in the movable plate and can rotate relative to the movable plate, one end of the injection screw is connected with the rotating hub, and a weight reduction groove is formed in the rotating hub; and the number of the first and second groups,

the third driving assembly comprises a second servo motor connected to the movable plate, a third belt wheel connected with the second servo motor, a fourth belt wheel connected to the rotating hub and a third synchronous belt meshed with the third belt wheel and the fourth belt wheel;

the movable plate is internally provided with a cavity for accommodating the rotating hub, a first end cover and a second end cover are respectively arranged at two ends of the movable plate, a third angular contact ball bearing, a tapered roller bearing and a deep groove ball bearing are arranged on the rotating hub from one side of the first end cover to the second end cover, and the stress directions of the third angular contact ball bearing and the tapered roller bearing are opposite; first end cover is including extending to the adjustable ring in the cavity, the adjustable ring is contradicted in the outer lane terminal surface department of third corner contact ball bearing, still set up the third mounting hole of circumference equipartition on the terminal surface of first end cover, seted up the regulation hole in two adjacent third mounting holes, regulation hole female connection has adjusting screw, adjusting screw's tip is contradicted on the terminal surface of movable plate.

Through adopting above-mentioned technical scheme, the material enters into the barrel after, injection screw with rotate hub synchronous rotation, rotate the hub and pass through the drive of third hold-in range by second servo motor and rotate, and then realize the screw propulsion of material. The rotating hub is connected with the injection screw, so that the injection screws of different models can be conveniently replaced, the rotating hub is partially accommodated in the cavity of the movable plate, the external structure is simplified, and the weight reduction groove is formed in the rotating hub, so that better rotational inertia can be ensured, and the stability of the injection screw during rotation is improved.

When the rotating hub rotates relative to the movable plate, the third angular contact ball bearing, the tapered roller bearing and the deep groove ball bearing are utilized to realize the relative rotation between the rotating hub and the movable plate, wherein the third angular contact ball bearing and the tapered roller bearing are opposite in stress and are used for bearing the axial load between the movable plate and the rotating hub in the displacement process of the injection seat, and the axial load resistance of the rotating hub is effectively improved; secondly, the first end cover can control the extrusion force between the first end cover and the third angle contact ball bearing through the adjusting screw, the tighter the adjusting screw is screwed to the end face of the movable plate, the smaller the acting force between the first end cover and the third angle contact ball bearing is, the axial gaps between the inner ring, the outer ring and the rolling parts of the third angle contact ball bearing and the tapered roller bearing can be better guaranteed, the better working state of the three bearings is kept, and the injection quality and the service life are improved.

The second purpose of the utility model is to provide an injection molding machine, the synchronism when keeping two lead screws to rotate that can be better improves injection quality and life.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

an injection molding machine, comprising the electric injection device.

To sum up, the utility model discloses a beneficial technological effect does:

1. the injection speed is improved by adopting a driving mode of double motors and double screws, and the synchronism of the double screws is improved by using a second synchronous belt to be meshed with two second belt wheels, so that the stability of the injection seat in the moving process is improved, the injection quality can be better under the condition of higher injection speed, the extrusion abrasion between the screws and the injection seat is reduced, and the service life of the device is prolonged;

2. the tensioning assembly is arranged to tension and adjust the second synchronous belt, so that the friction force between the second synchronous belt and the second belt wheel is improved, the slipping phenomenon between the second synchronous belt and the second belt wheel is reduced, the synchronism of the two second belt wheels during rotation is better improved, meanwhile, the bearing plate is utilized to bear the tensioning force between the two second belt wheels during tensioning synchronization, the two second belt wheels are positioned, the extrusion abrasion between the two lead screws and the second belt wheels is reduced, the stability of lead screw transmission is better improved, and the service life of the whole device is longer;

3. the injection seat is arranged in a split mode, the two screw rods are synchronously connected to the thrust plate, acting force of the two screw rods is transmitted through the thrust plate and acts on the stress plate with the force sensor, the first convex ring and the second convex ring are arranged at the two ends of the stress plate respectively and used for increasing the contact area and installing and positioning accuracy, and meanwhile, the deformation of the stress plate is improved by setting the diameters of the first convex ring and the second convex ring, so that force measurement data obtained finally are more accurate, the injection quality is improved, the integral structure is simplified, and the manufacturing cost is reduced;

4. the bearing seat is arranged at the tail plate, and the plurality of first angular contact ball bearings and the plurality of second angular contact ball bearings are arranged in the bearing seat to abut against the axial load of the screw rod due to the injection pressure, so that the service life of the screw rod is prolonged, the limit assembly is utilized to limit the stroke of the injection seat, the overall length of the screw rod can be shortened, the manufacturing cost is reduced, the length of the screw rod is shortened, the manufacturing production is facilitated, and meanwhile, higher rigidity can be ensured;

5. the first pull rod and the second pull rod are arranged through the center of the cylinder hole in a diagonal manner, so that the torque generated by the base when the injection seat is displaced during injection is reduced, the stability during injection is improved, and meanwhile, the weight of the injection seat is borne by the bottom plate of the base through the matching between the sliding block and the linear guide rail, so that the stress of the pull rod group is reduced, the guidance performance of the injection seat in the displacement process is improved, and the injection precision is improved;

6. through being connected injection screw with the rotation hub, be convenient for change the injection screw of different models, utilize first end cover to adjust the pretightning force of inner bearing simultaneously, the life of better promotion inner bearing, and then improve the stability and the life of whole device operation.

Drawings

FIG. 1 is a schematic view of an electric injection device according to a first embodiment;

FIG. 2 is a schematic view of an injection seat mounted on a base according to one embodiment;

FIG. 3 is a schematic structural diagram mainly illustrating a front plate of the susceptor in the first embodiment;

FIG. 4 is an exploded view of the injection seat shown from a perspective according to one embodiment;

FIG. 5 is an exploded view of the injection seat shown from another perspective according to one embodiment;

FIG. 6 is a schematic structural view of an injection mechanism according to a first embodiment;

FIG. 7 is a schematic view of the mounting of the rotating hub in the movable plate according to one embodiment;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is a front view of the first end cap of the first embodiment;

FIG. 10 is a schematic structural diagram of a driving mechanism according to a first embodiment;

FIG. 11 is a model diagram of the stress on the two second pulleys during tensioning adjustment according to the first embodiment;

FIG. 12 is a schematic view of the installation between the screw and the bearing seat in the first embodiment;

fig. 13 is a schematic structural diagram of a screw assembly according to an embodiment.

In the figure, 10, a base; 11. a front plate; 111. a pull rod mounting hole; 112. a barrel bore; 12. a tail plate; 13. a base plate; 20. an injection seat; 21. a movable plate; 211. a first guide cylinder; 212. a first ring groove; 213. a cavity; 214. a first end cap; 2141. an adjusting ring; 2142. a third mounting hole; 2143. an adjustment hole; 215. a second end cap; 216. a first shoulder; 217. a second shoulder; 218. a third shoulder; 22. a strain gauge pressure sensor; 221. a first convex ring; 2211. a first mounting hole; 222. a second convex ring; 2221. a second mounting hole; 23. a thrust plate; 231. a second guide cylinder; 232. a connecting seat; 233. a second ring groove; 24. a slider; 25. a linear guide rail; 30. a drive mechanism; 31. a first drive assembly; 32. a second drive assembly; 33. a first servo motor; 34. a first pulley; 35. a first synchronization belt; 36. a second pulley; 361. a first hub; 362. a second hub; 37. a carrier plate; 38. a second synchronous belt; 39. a wheel body; 391. a wheel groove; 392. pressing a plate; 393. connecting a bearing; 40. a lead screw assembly; 41. a lead screw; 411. a threaded segment; 412. a light axis segment; 42. a nut seat; 43. a bearing seat; 44. a bearing cap; 45. a first angular contact ball bearing; 46. a second angular contact ball bearing; 50. an injection mechanism; 51. a barrel; 52. an injection screw; 53. a charging bucket; 54. a second servo motor; 55. a third belt pulley; 56. a fourth pulley; 57. a third synchronous belt; 58. rotating the hub; 581. a weight reduction groove; 582. a third contact ball bearing; 5821. an outer ring; 583. a tapered roller bearing; 584. a deep groove ball bearing; 60a, a first pull rod; 60b, a second pull rod; 61. an anchor ear is arranged; 62. a lower hoop; 63. a limiting rod; 70. a tension wheel; 71. an adjusting seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

Referring to fig. 1, there is shown a structure of a power injection device, which includes a base 10, an injection seat 20 disposed in the base 10, an injection mechanism 50 connected to the injection seat 20, and a driving mechanism 30. The driving mechanism 30 is connected with a screw assembly 40, the screw assembly 40 is connected with the injection seat 20, and the driving mechanism 30 drives the injection seat 20 to displace so as to realize the injection process.

Referring to fig. 2 and 3 together, the base 10 is substantially U-shaped, and includes a front plate 11 and a rear plate 12 spaced apart from each other, the front plate 11 and the rear plate 12 are connected by a bottom plate 13, and the injection seat 20 is located above the bottom plate 13 and between the front plate 11 and the rear plate 12. A pull rod group is further arranged between the front plate 11 and the tail plate 12, two pull rod mounting holes 111 are formed in the front plate 11 and the tail plate 12 in an oblique diagonal mode, a barrel hole 112 is further formed in the front plate 11, and connecting lines of circle centers of the two pull rod mounting holes 111 and the barrel hole 112 are located on the same straight line L. The pull rod set comprises a first pull rod 60a and a second pull rod 60b, two ends of the first pull rod 60a and the second pull rod 60b are respectively arranged in the pull rod mounting holes 111 in a penetrating mode for positioning, and the injection seat 20 is connected to the first pull rod 60a and the second pull rod 60b in a sliding mode, so that the displacement of the injection seat 20 is guided.

The bottom plate 13 is further provided with two parallel linear guide rails 25, the bottom of the injection seat 20 is provided with a slide block 24 matched with the linear guide rails 25, the whole weight of the injection seat 20 is transmitted to the bottom plate 13 through the linear guide rails 25, and the gravity of the injection seat 20 on the first pull rod 60a and the second pull rod 60b is reduced.

The device is also provided with a limiting component which is used for limiting the sliding stroke of the injection seat 20 on the pull rod set. Comprises a hoop arranged at one end of the first pull rod 60a and the second pull rod 60b at the same side, and a limit rod 63 arranged on one end face of the injection seat 20 far away from the hoop. The anchor ear comprises an upper anchor ear 61 and a lower anchor ear 62, the upper anchor ear 61 and the lower anchor ear 62 are sleeved on the first pull rod 60a and the second pull rod 60b through bolts, and one end face of the whole anchor ear is abutted on the surface of the front plate 11. One end of the limiting rod 63 is connected to the injection seat 20 in a threaded manner, the other end of the limiting rod extends towards one side of the tail plate 12, and the end of the limiting rod 63 is abutted to the tail plate 12 to limit the displacement of the injection seat 20 in one side direction.

Referring to fig. 4 and 5 together, the injection seat 20 is a split type, and includes a movable plate 21, a strain gauge pressure sensor 22, and a thrust plate 23 connected in sequence. The movable plate 21 is a main body plate, the slider 24 in fig. 2 is mounted at the bottom of the movable plate 21, the entire movable plate 21 includes two first guide cylinders 211 diagonally arranged, the two first guide cylinders 211 are used for the first pull rod 60a and the second pull rod 60b to penetrate, thereby realizing the sliding connection between the movable plate 21 and the pull rod set, and simultaneously realizing the displacement limitation in the other side direction of the entire injection seat 20 when the end surface of the first guide cylinder 211 abuts against the end surface of the hoop.

The strain type pressure sensor 22 is roughly in a round cake shape, a first convex ring 221 is arranged at the outer edge of one end face of the strain type pressure sensor, and a plurality of first mounting holes 2211 in a circumferential array are formed in the first convex ring 221; the end surface of the movable plate 21 is provided with a first annular groove 212 for the first protruding ring 221 to be clamped, and the movable plate 21 and the strain type pressure sensor 22 are fixed by a plurality of screws passing through the first mounting holes 2211.

The thrust plate 23 includes two second guiding cylinders 231 arranged diagonally, and the first pull rod 60a and the second pull rod 60b respectively pass through the two second guiding cylinders 231, so as to improve the guidance of the entire injection seat 20 during sliding. The thrust plate 23 is provided with a second ring groove 233 on an end surface facing the strain type pressure sensor 22, the strain type pressure sensor 22 is provided with a second convex ring 222 on the end surface facing the thrust plate 23, the second convex ring 222 can be clamped in the second ring groove 233, a plurality of second mounting holes 2221 are arranged on the second convex ring 222 in the same circumferential array, and the whole strain type pressure sensor 22 passes through the second mounting holes 2221 by screws to be mounted and fixed with the thrust plate 23.

It is particularly noted that the first collar 221 and the second collar 222 are concentrically disposed, and in this embodiment, the diameter of the first collar 221 is larger than that of the second collar 222, and when the strain gauge pressure sensor 22 is mounted, it is necessary to complete the connection between the strain gauge pressure sensor 22 and the thrust plate 23 in advance, and then to mount the connection between the strain gauge pressure sensor 22 and the movable plate 21. When the injection seat 20 is stressed, the thrust plate 23 acts on the first convex ring 221, and the second convex ring 222 receives the acting force of the movable plate 21 through the acting force and the reaction force, so that the whole strain type pressure sensor 22 generates a moment, the deformation of the strain gauge is improved, and the force measurement precision is improved.

Referring to fig. 6 and 7 together, the injection mechanism 50 includes a barrel 51, a rotating hub 58 retained in the movable plate 21, and a third driving assembly for driving the rotating hub 58 to rotate. The barrel 51 is partially disposed through the barrel bore 112 (see FIG. 3) and secured thereto by a nut. An injection screw 52 penetrates through the cylinder 51, a material barrel 53 is connected above the cylinder 51, and the injection material enters the cylinder 51 through the material barrel 53 and moves to one side of the nozzle through the rotation of the injection screw 52.

One end of the injection screw 52 extends from within the barrel 51 and is connected to a rotating hub 58. A cavity 213 is formed in the movable plate 21, and the rotating hub 58 is partially received in the cavity 213 and is rotatable relative to the movable plate 21.

The third driving unit includes a second servo motor 54 fixed to the movable plate 21, a third pulley 55 connected to the second servo motor 54, and a fourth pulley 56. The fourth belt wheel 56 is fixedly mounted with the rotary hub 58 through key connection, synchronous rotation of the fourth belt wheel 56 and the rotary hub 58 is achieved, the third belt wheel 55 and the fourth belt wheel 56 are linked through the third synchronous belt 57, and further when the second servo motor 54 works, the rotary hub 58 can be driven to rotate the injection screw 52, and feeding of injection materials is achieved.

A first end cap 214 and a second end cap 215 are connected to both ends of the cavity 213 of the movable plate 21, respectively, and both ends of the cavity 213 are closed by the first end cap 214 and the second end cap 215. In order to realize the relative rotation between the rotating hub 58 and the movable plate 21, a third contact ball bearing 582, a tapered roller bearing 583 and a deep groove ball bearing 584 are sequentially installed on the rotating hub 58 from one side of the first end cover 214 to the second end cover 215, wherein the force directions of the third contact ball bearing 582 and the tapered roller bearing 583 are opposite. The rotating hub 58 is a rotating body formed by rotating around an axis, and is provided with a first shaft shoulder 216 for abutting against the end surface of the third contact ball bearing 582, a second shaft shoulder 217 and a third shaft shoulder 218 for abutting against the two end surfaces of the tapered roller bearing 583, and the first end cover 214 applies pretightening force to the end surface of the third contact ball bearing 582, so that the clearance between the third contact ball bearing 582 and the inner part of the tapered roller bearing 583 is ensured, and the stability in working is improved. Furthermore, a lightening groove 581 is formed in the rotary hub 58 along the axis, and the lightening groove 581 is formed by cutting out the rotary hub around the axis and is designed to achieve the moment of inertia when the rotary hub 58 rotates.

Referring to fig. 8 and 9, the first end cap 214 includes a adjusting ring 2141 extending toward a side of the third contact ball bearing 582, and an end of the adjusting ring 2141 abuts against an outer ring 5821 of the third contact ball bearing 582. The first end cap 214 is provided with a plurality of third mounting holes 2142 uniformly distributed in the circumferential direction at the outer edge of the end surface thereof, and the first end cap 214 and the movable plate 21 are connected by a fastener passing through the third mounting holes 2142. An adjusting hole 2143 is further formed in each two adjacent third mounting holes 2142, an adjusting screw is connected to each adjusting hole 2143 through internal threads, the end portion of each adjusting screw can abut against the end face of the movable plate 21, pre-tightening force between the first end cover 214 and the third corner contact ball bearing 582 is achieved by screwing the adjusting screw, the adjusting screw is screwed into one side of the movable plate 21, the larger the gap between the first end cover 214 and the third corner contact ball bearing 582 is, and the smaller the pre-tightening force between the first end cover 214 and the third corner contact ball bearing 582 is.

Referring to fig. 1 and 10 together, the driving mechanism 30 includes two sets of first driving components 31 and second driving components 32 with the same structure. The first driving assembly 31 and the second driving assembly 32 both comprise a first servo motor 33 fixed on the tail plate 12, the first servo motor 33 is connected with a first belt wheel 34, one end of the screw rod assembly 40 is connected with a second belt wheel 36, the first belt wheel 34 and the second belt wheel 36 are driven by a first synchronous belt 35, and the first servo motor 33 drives the screw rod assembly 40 to work.

Referring to fig. 11 and 12, the two second pulleys 36 are synchronously adjusted by a second timing belt 38. The second pulley 36 includes a first hub 361 and a second hub 362 adjacent to the first hub 361, in which the first timing belt 35 is engaged on the first hub 361 and the second timing belt 38 is engaged on the second hub 362.

The tailgate 12 is further provided with a tensioning assembly comprising a tensioning wheel 70, the tensioning wheel 70 being pivotally connected to an adjustment seat 71. The tension pulley 70 is located on the perpendicular plane of the connecting line of the circle centers of the two second belt pulleys 36, and the tension pulley 70 is always attached to the smooth surface of the second synchronous belt 38, specifically, the smooth surface is flat and has no teeth. The tension adjustment of the second timing belt 38 is achieved by the vertical sliding of the adjustment block 71. For example, as shown in fig. 11, the tension pulley 70 applies a force to the second timing belt 38, so that the degree of engagement between the second timing belt 38 and the two second pulleys 36 is increased, the transmission efficiency is improved, and the slip phenomenon is reduced.

Meanwhile, the acting force of the two second belt wheels 36 on the second timing belt 38 has an opposite tensioning force F1, so that the two second belt wheels 36 have opposite movement trends, the acting force of the tensioning wheel 70 causes the two second belt wheels 36 to have a vertically downward acting force F2, the tensioning force F1 and the acting force F2 are combined through force, so that the two second belt wheels 36 have the magnitude and the movement trends of the acting force F3, the larger the included angle α between the acting force F3 and the horizontal plane is, the larger the downward inclination amplitude of the two second belt wheels 36 is, therefore, a bearing plate 37 is further arranged between the two second belt wheels 36, the acting force F3 is resisted by the bearing plate 37, the movement trends of the two second belt wheels 36 in the radial direction are reduced, and the bearing plate 37 and the limiting wheel also serve as bearing components of the two second belt wheels 36.

One end of the second belt wheel 36 is connected with a limiting wheel, the limiting wheel comprises a wheel body 39 partially accommodated in the second belt wheel 36, and the wheel body 39 and the second belt wheel 36 rotate relatively through a connecting bearing 393 arranged in the second belt wheel 36. One end of the wheel body 39 penetrates through the bearing plate 37 and is connected with a pressing plate 392 through a screw, a wheel groove 391 is formed between the pressing plate 392 and the wheel body 39, and the bearing plate 37 is just embedded in the wheel groove 391 to realize the connection between the bearing plate 37 and the wheel body 39.

Referring to fig. 12 and 13 together, the screw assembly 40 includes two sets, each set including a screw 41 and a nut seat 42 screwed on the screw 41. Referring to fig. 4, the thrust plate 23 further includes a connecting seat 232 located at both sides, and an end surface of the nut seat 42 is connected to the connecting seat 232 by a screw, thereby achieving connection between the screw assembly 40 and the injection seat 20.

The screw 41 includes a threaded section 411 and an optical axis section 412 extending from an end of the threaded section 411 toward the tail plate 12, and an end of the optical axis section 412 is connected to the second pulley 36, so that the rotation of the second pulley 36 can drive the rotation of the whole screw 41. A bearing seat 43 is further installed in the tail plate 12, and a bearing cavity is provided in the bearing seat 43, in this embodiment, three first angular contact ball bearings 45 and one second angular contact ball bearing 46 are sequentially installed in the bearing cavity. One end of the bearing seat 43 is closed by a bearing cover 44, and three first angular ball bearings 45 and one second angular ball bearing 46 are mounted on the optical shaft section 412.

The injection direction is defined as the direction indicated by the arrow B, the force receiving direction of the first angular contact ball bearing 45 is opposite to the injection direction, and the second angular contact ball bearing 46 is the same as the injection direction. When in injection, the lead screw 41 can be acted by a force opposite to the injection direction, and the three first angular contact ball bearings 45 can resist the acting force from the lead screw 41 to achieve the bearing effect; and the second angular contact ball bearing 46 is used for resisting the reaction force applied to the lead screw 41 when the lead screw moves in the opposite direction after the injection is completed, so that the whole lead screw assembly 40 has high axial load resistance.

When the injection device works, the second servo motor 54 works to drive the injection screw 52 to rotate in advance, an operator puts injection materials into the charging basket 53, and the injection materials can be pushed under the action of the injection screw 52. Subsequently, the two first servo motors 33 work to synchronously drive the two second belt wheels 36 to rotate, the second belt wheels 36 drive the two lead screws 41 to rotate, the lead screws 41 drive the nut seats 42 to displace along the axial direction of the lead screws 41, and further drive the injection seats 20 to displace along the axial direction of the pull rods 60, so as to push the injection screw 52 to displace axially in the barrel 51, thereby realizing the propulsion injection. During the injection process, the strain gauge pressure sensor 22 receives the acting forces of the movable plate 21 and the thrust plate 23 to generate a pressure signal, and the pressure signal is fed back to the two first servo motors 33 to adjust the output torque of the first servo motors 33, thereby controlling the propelling speed of the injection seat 20.

Example two

An injection molding machine comprises the electric injection device in the first embodiment.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (11)

1. An electric injection device, comprising:

a base (10) including a front plate (11) and a tail plate (12) spaced a certain distance from the front plate (11);

the pull rod group is connected between the front plate (11) and the tail plate (12);

the injection seat (20) is arranged between the front plate (11) and the tail plate (12) and is connected with the pull rod set in a sliding manner;

the driving mechanism (30) comprises a first driving component (31) and a second driving component (32) which are identical in structure, and the first driving component (31) and the second driving component (32) respectively comprise a first servo motor (33) arranged on the tail plate (12), a first belt wheel (34) connected to the first servo motor (33), a second belt wheel (36) and a first synchronous belt (35) meshed with the first belt wheel (34) and the second belt wheel (36); and the number of the first and second groups,

one end of each of the two lead screw assemblies (40) is respectively and correspondingly connected to the first driving assembly (31) and the second driving assembly (32), the other end of each of the two lead screw assemblies (40) is connected to the injection seat (20), and the lead screw assemblies (40) are driven by the second belt wheel (36) and force the injection seat (20) to displace along the axial direction of the pull rod set;

the second belt wheel (36) comprises a first hub (361) meshed with the first synchronous belt (35) and second hubs (362) adjacent to the first hub (361), and second synchronous belts (38) are meshed on the two adjacent second hubs (362).

2. An electric injection device according to claim 1, further comprising a tensioning assembly, said tensioning assembly comprising a tensioning wheel (70), said tensioning wheel (70) being disposed between two second pulleys (36); the tensioning wheel (70) can displace along the vertical direction of the connecting line of the circle centers of the two second belt wheels (36), and the smooth surface of the second synchronous belt (38) is always attached to the tensioning wheel (70).

3. An electric injection device according to claim 2, further comprising a force-bearing member, wherein the force-bearing member comprises a limiting wheel mounted on the second pulley (36) and rotatable with respect to the second pulley (36), and a bearing plate (37) mounted on the limiting wheels.

4. An electric injection device according to claim 1, wherein the screw assembly (40) comprises:

the nut seat (42), one end of the said nut seat (42) is connected with injection seat (20);

the lead screw (41) comprises a threaded section (411) in threaded connection with the nut seat (42) and a light shaft section (412) extending from one end of the threaded section (411) to one side of the tail plate (12), and the light shaft section (412) is connected with the second belt wheel (36); and the number of the first and second groups,

the bearing seat (43) is installed in the tail plate (12), the bearing seat (43) is provided with a bearing cavity, and at least one first angular contact ball bearing (45) and an adjacent second angular contact ball bearing (46) are installed in the bearing cavity;

the first angular contact ball bearing (45) and the second angular contact ball bearing (46) are sleeved on the optical shaft section (412), the stress direction of the first angular contact ball bearing (45) is opposite to the injection direction, the stress direction of the second angular contact ball bearing (46) is the same as the injection direction, and the number of the first angular contact ball bearing (45) is larger than that of the second angular contact ball bearing (46).

5. An electric injection device according to claim 1, characterized in that the injection seat (20) comprises:

a movable plate (21);

a strain type pressure sensor (22) having one end connected to the movable plate (21); and the number of the first and second groups,

a thrust plate (23) connected to one end surface of the strain type pressure sensor (22) remote from the movable plate (21);

the movable plate (21) and the thrust plate (23) are connected to the pull rod set in a sliding mode, and one end of the screw rod assembly (40) is connected with the thrust plate (23).

6. The electric injection device according to claim 5, wherein the strain type pressure sensor (22) comprises a first convex ring (221) and a second convex ring (222) which are concentrically arranged on two end faces, a first annular groove (212) for clamping the first convex ring (221) is formed in the movable plate (21), a second annular groove (233) for clamping the second convex ring (222) is formed in the thrust plate (23), a plurality of first mounting holes (2211) are formed in the first convex ring (221) in the circumferential direction, and a second mounting hole (2221) is formed in the second convex ring (222) in the circumferential direction; wherein the radius of the first convex ring (221) is not equal to the radius of the second convex ring (222).

7. The electric injection device according to claim 1, wherein the pull rod set comprises a first pull rod (60 a) and a second pull rod (60 b), the front plate (11) is provided with a barrel hole (112), the first pull rod (60 a) and the second pull rod (60 b) are diagonally arranged between the front plate and the rear plate, and the connection lines of the centers of the first pull rod (60 a) and the second pull rod (60 b) and the barrel hole (112) are on the same straight line.

8. The power injector as claimed in claim 7, further comprising a stop assembly, the stop assembly comprising:

the hoop is sleeved on the first pull rod (60 a) and the second pull rod (60 b), and one end of the hoop is abutted against the front plate (11); and the number of the first and second groups,

one end of the limiting rod (63) is connected to the injection seat (20), and the other end extends to the tail plate (12).

9. An electric injection device according to claim 7, characterized in that the base (10) is integrally provided, and further comprises a bottom plate (13) connecting the front plate (11) and the tail plate (12), two parallel linear guide rails (25) are mounted on the bottom plate (13), and the bottom of the injection seat (20) is provided with a slide block (24) matched with the linear guide rails (25).

10. An electric injection device according to claim 5, further comprising an injection mechanism (50), said injection mechanism (50) comprising:

a cylinder (51), wherein one end of the cylinder (51) is connected with the front plate (11), and an injection screw (52) is arranged in the cylinder (51);

the rotating hub (58) is partially accommodated in the movable plate (21) and can rotate relative to the movable plate (21), one end of the injection screw rod (52) is connected with the rotating hub (58), and a lightening groove (581) is formed in the rotating hub (58); and the number of the first and second groups,

a third driving assembly including a second servo motor (54) connected to the movable plate (21), a third pulley (55) connected to the second servo motor (54), a fourth pulley (56) connected to a rotating hub (58), and a third timing belt (57) engaged with the third pulley (55) and the fourth pulley (56);

the movable plate (21) is internally provided with a cavity (213) for accommodating a rotating hub (58), two ends of the movable plate (21) are respectively provided with a first end cover (214) and a second end cover (215), the rotating hub (58) is provided with a third contact ball bearing (582), a tapered roller bearing (583) and a deep groove ball bearing (584) in the direction from one side of the first end cover (214) to the second end cover (215), and the force directions of the third contact ball bearing (582) and the tapered roller bearing (583) are opposite; first end cover (214) are including extending to adjustable ring (2141) in cavity (213), adjustable ring (2141) are contradicted in outer lane (5821) terminal surface department of third angle contact ball bearing (582), third mounting hole (2142) of circumference equipartition have still been seted up on the terminal surface of first end cover (214), have seted up regulation hole (2143) in two adjacent third mounting holes (2142), regulation hole (2143) female connection has adjusting screw, adjusting screw's tip is contradicted on the terminal surface of movable plate (21).

11. An injection molding machine comprising an electric injection device according to any one of claims 1 to 10.

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