CN111605148A

CN111605148A - Full-electric ejection device

Info

Publication number: CN111605148A
Application number: CN202010466661.9A
Authority: CN
Inventors: 傅南红; 林旭焕; 赵龙; 柴贤彬
Original assignee: Ningbo Zhafir Plastics Machinery Co ltd
Current assignee: Ningbo Zhafir Plastics Machinery Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-09-01

Abstract

The invention discloses a full-electric ejection device, which comprises a motor assembly, a synchronous pulley assembly, a screw rod pair and a central ejection assembly, wherein the screw rod pair consists of a screw rod and a nut matched with the screw rod; the advantages are that the lead screw pair lead screw and the main ejection rod are coaxially arranged, and the lead screw pair lead screw is suitable for all-electric single-color injection molding machines, double-color injection molding machines and multi-component injection molding machines.

Description

Full-electric ejection device

Technical Field

The invention relates to an injection molding machine, in particular to a full-electric ejection device.

Background

In recent years, the industry of injection molding machines has developed rapidly, and in order to meet the demand of market diversification, a double-color injection molding machine and a multi-component injection molding machine have become a bright spot of the industry. At present, all-electric, all-hydraulic and electro-hydraulic mixed injection molding machines exist in the market. As the hydraulic machine adopted by the full-hydraulic injection molding machine has the problems of large pollution, low control precision and the like, many merchants are biased to research and develop the full-hydraulic injection molding machine. Although the research and development of the fully-electric injection molding machine have achieved great success, the fully-electric two-color injection molding machine or multi-component injection molding machine on the market is rarely researched at present and is basically fully-hydraulic or electro-hydraulic.

The central ejection device of the full-hydraulic or electro-hydraulic mixed double-color injection molding machine basically adopts hydraulic ejection, but the hydraulic ejection has low control precision and is difficult to realize independent ejection control. The central ejection device of the fully-electric single-color injection molding machine adopts electric ejection, but because a screw rod of a screw pair is not coaxial with a main ejection rod, the central ejection device can only be applied to the fully-electric single-color injection molding machine with a double-screw pair single ejection structure, but cannot be applied to the fully-electric multi-component injection molding machine with a fully-electric double ejection structure.

Disclosure of Invention

The invention aims to solve the technical problem of providing a full-electric ejection device, wherein a screw rod of a screw pair and a main ejection rod are coaxially arranged, and the full-electric ejection device is suitable for full-electric single-color injection molding machines, double-color injection molding machines and multi-component injection molding machines.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a full-electric ejecting device, includes motor element, synchronous pulley subassembly, lead screw pair, central ejecting subassembly, the lead screw pair by the lead screw and with lead screw complex nut constitute its characterized in that: the motor assembly drives the nut to rotate through the synchronous pulley assembly, the lead screw drives the central ejection assembly to axially move, the central ejection assembly comprises an ejection guide plate and a main ejection rod, the axial rear end of the lead screw is fixedly connected with the front end face of the ejection guide plate, the axial front end of the main ejection rod is fixedly connected with the rear end face of the ejection guide plate, and the lead screw is coaxial with the main ejection rod.

The full-electric ejection device also comprises a lead screw supporting assembly, wherein the lead screw supporting assembly consists of a bearing, a lead screw sleeve, a fastening nut, a bearing seat and a bearing gland, the bearing sleeve is arranged outside the screw nut in a sleeved mode, the rear end of an inner ring of the bearing is pressed by a rear end flange of the screw nut, the lead screw sleeve is arranged outside the screw nut in a sleeved mode, the front end of the inner ring of the bearing is pressed by the lead screw sleeve, the fastening nut is in threaded connection with the front end of the screw nut to tightly press the bearing, the bearing seat is arranged outside the bearing in a sleeved mode, a rear end oil seal is arranged between the inner side of the rear end of the bearing seat and the outer wall of the rear end flange of the screw nut, the bearing gland is fixedly connected with the front end of the bearing seat, and a front end oil seal is arranged between the rear end of the bearing gland and the outer wall of the lead screw sleeve, the bearing seat is characterized in that a lubricating oil joint for providing lubricating oil for the bearing is arranged on the top of the bearing seat, an oil drainage hole for draining redundant lubricating oil is formed in the bottom of the bearing seat, and a plug is arranged on the oil drainage hole. When the nut rotates at a high speed, the nut can stably rotate through the screw support assembly.

The motor element constitute by servo motor, the hold-in range wheel subassembly constitute by first band pulley, second band pulley and hold-in range, first band pulley set up in servo motor's output shaft on, the second band pulley cover locate the rear end of lead screw on, the second band pulley with the rear end flange of screw pass through fastener fixed connection, the rotation of second band pulley drives screw rotary motion, the hold-in range around locating first band pulley with the second band pulley on.

Four corners of the ejection guide plate are respectively and movably provided with a guide rod, the axis of each guide rod is parallel to the axis of the main ejection rod, the axial front end of each guide rod is connected with the bearing seat through a connecting plate, the rear end of each guide rod is connected with a movable template of the injection molding machine, and the four guide rods play a role in supporting the ejection guide plate and the bearing seat.

The ejection guide plate is movably provided with at least one limiting rod, the axis of the limiting rod is parallel to the axis of the main ejection rod, the axial front end of the limiting rod is provided with a limiting stop block used for limiting excessive axial movement of the ejection guide plate during retraction, and the rear end of the limiting rod is connected with a movable template of the injection molding machine. In general, two limiting rods are symmetrically arranged up and down, so that the limiting is more stable; in addition, the limiting rod also plays a role in supporting the ejection guide plate.

The ejection guide plate is provided with four auxiliary ejection rods, the four auxiliary ejection rods are distributed around the main ejection rod, and the axes of the auxiliary ejection rods are parallel to the axis of the main ejection rod. Generally, four auxiliary ejection rods are positioned at four corners around the main ejection rod, namely, the four auxiliary ejection rods enclose a square.

The central position of the rear end face of the ejecting guide plate is fixed with a fixed sleeve through a fastener, and the axial front end of the main ejecting rod is in threaded connection with the fixed sleeve.

Compared with the prior art, the invention has the advantages that:

1) the screw is driven to rotate by the motor assembly, so that the screw rod drives the main ejection rod to move axially, namely, electric ejection is adopted, the screw rod pair can be accurately driven, the control precision is high, and the electric ejection and synchronous pulley assembly transmission can be adopted to conveniently realize independent ejection control; in addition, the screw pair has high transmission efficiency, energy conservation, high efficiency and no pollution.

2) The rear axial end of the screw rod is fixedly connected with the front end face of the ejection guide plate, the front axial end of the main ejection rod is fixedly connected with the rear end face of the ejection guide plate, and the screw rod is coaxial with the main ejection rod.

Drawings

Fig. 1 is a schematic structural view of an all-electric ejection device of the present invention;

FIG. 2 is a cross-sectional view of a lead screw pair and a lead screw support assembly in the all-electric ejection device of the present invention;

fig. 3 is a schematic structural view of a center ejection assembly in the all-electric ejection device of the present invention;

fig. 4 is a partial sectional view of a connecting structure of a main ejector rod and an ejector guide plate in a center ejector assembly in the all-electric ejector device of the present invention;

fig. 5 is a schematic view of the fully-electric ejection device of the present invention mounted on a movable platen of an injection molding machine.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The invention provides a full-electric ejection device, which comprises a motor assembly 1, a synchronous pulley assembly 2, a screw pair 3 and a central ejection assembly 4, wherein the screw pair 3 consists of a screw rod 31 and a nut 32 matched with the screw rod 31, the motor assembly 1 drives the nut 32 to rotate through the synchronous pulley assembly 2, the screw rod 31 drives the central ejection assembly 4 to axially move, the central ejection assembly 4 consists of an ejection guide plate 41 and a main ejection rod 42, the axial rear end of the screw rod 31 is fixedly connected with the front end face of the ejection guide plate 41, the axial front end of the main ejection rod 42 is fixedly connected with the rear end face of the ejection guide plate 41, specifically, a fixed sleeve 48 is fixed at the central position of the rear end face of the ejection guide plate 41 through a fastener such as a screw, the axial front end of the main ejection rod 42 is in threaded connection with the fixed sleeve 48, and the screw rod 31 is coaxial with the main ejection rod 42.

In this embodiment, the full electric ejection device further includes a screw supporting assembly 5, the screw supporting assembly 5 is composed of a bearing 51, a screw sleeve 52, a fastening nut 53, a bearing seat 54, and a bearing gland 55, the bearing 51 is sleeved outside the nut 32, the rear end of the inner ring of the bearing 51 is pressed by the rear end flange 321 of the nut 32, the screw sleeve 52 is sleeved outside the nut 32, the front end of the inner ring of the bearing 51 is pressed by the screw sleeve 52, the fastening nut 53 is screwed with the front end of the nut 32 to press the bearing 51, the bearing seat 54 is sleeved outside the bearing 51, a rear end oil seal 56 is disposed between the inner side of the rear end of the bearing seat 54 and the outer wall of the rear end flange 321 of the nut 32, the bearing gland 55 is fixedly connected with the front end of the bearing seat 54, a front end oil seal 57 is disposed between the rear end of the bearing gland 55 and the outer wall of the screw sleeve 52, a lubricating oil joint 541 for providing lubricating oil for the bearing 51, an oil drainage hole 542 for draining redundant lubricating oil is formed in the bottom of the bearing seat 54, and a plug 543 is arranged on the oil drainage hole 542. When the nut 32 rotates at a high speed, the rotation is stabilized by the screw support assembly 5.

In this embodiment, the motor assembly 1 is composed of the servo motor 11, the synchronous pulley assembly 2 is composed of a first pulley 21, a second pulley 22 and a synchronous belt 23, the first pulley 21 is disposed on the output shaft of the servo motor 11, the second pulley 22 is sleeved on the rear end of the screw rod 31, the second pulley 22 is fixedly connected to the rear end flange 321 of the screw nut 32 through a fastener, the second pulley 22 rotates to drive the screw nut 32 to rotate, the second pulley 22 is located in front of the ejector guide plate 41, that is, the second pulley 22 is located between the ejector guide plate 41 and the bearing seat 54, the inside installation manner makes the overall structure more compact, and the synchronous belt 23 is wound on the first pulley 21 and the second pulley 22.

In the embodiment, four corners of the ejection guide plate 41 are respectively and movably provided with a guide rod 43, the axis of each guide rod 43 is parallel to the axis of the main ejection rod 42, the axial front end of each guide rod 43 is connected with a bearing seat 54 through a connecting plate 44, the rear end of each guide rod 43 is in threaded connection with the movable mold plate 6 of the injection molding machine, and the ejection guide plate 41 and the bearing seats 54 are supported by four guide rods 43; two limiting rods 45 are movably arranged on the ejection guide plate 41, the two limiting rods 45 are vertically and symmetrically distributed, the axis of each limiting rod 45 is parallel to the axis of the main ejection rod 42, a limiting stop 46 used for limiting excessive axial movement of the ejection guide plate 41 during retraction is arranged at the axial front end of each limiting rod 45, namely the limiting stop 46 is used for preventing the ejection guide plate 41 from colliding with the second belt wheel 22 on the premise of protecting ejection and retraction in place, and the rear end of each limiting rod 45 is connected with the movable die plate 6 of the injection molding machine; four auxiliary ejector rods 47 are arranged on the ejector guide plate 41, specifically, the respective axial front ends of the four auxiliary ejector rods 47 are respectively in threaded connection with the ejector guide plate 41, the four auxiliary ejector rods 47 are distributed around the main ejector rod 42, the axis of the auxiliary ejector rod 47 is parallel to the axis of the main ejector rod 42, the four auxiliary ejector rods 47 are located at four corners around the main ejector rod 42 under a general condition, namely, the four auxiliary ejector rods 47 enclose a square.

Here, the servo motor 11 adopts the prior art; the first belt pulley 21 and the second belt pulley 22 are both existing belt pulleys; the connection between the first belt wheel 21 and the output shaft of the servo motor 11 and the connection between the second belt wheel 22 and the front end of the screw rod 31 can adopt the existing connection technology, such as key connection and tension wheel connection; the bearing adopts the prior art; the fastening nut 53 can be a common nut; the front end oil seal 57 and the rear end oil seal 56 are both conventional oil seals.

An oil passage may be provided in the screw rod 31, and lubricating oil in the oil passage is used to provide lubricating oil for the screw rod 31 and the nut 32, so as to ensure stable operation of the screw rod 31 and the nut 32.

When the device is installed, a servo motor 11 is installed on a movable template 6 of an injection molding machine through a motor flange 12, the servo motor 11 provides driving force for a central ejection assembly 4, a heated bearing 51 is installed on the outer diameter of a nut 32, a lead screw sleeve 52 is installed to press the inner ring of the bearing 51, the bearing 51 is pressed through a fastening nut 53 to reduce or eliminate axial clearance, a rear end oil seal 56 is installed on the inner side of the rear end of a bearing seat 54, a lead screw pair 3 which is already provided with the bearing 51, the lead screw sleeve 52 and the fastening nut 53 is installed in the bearing seat 54, a front end oil seal 57 is installed in the rear end of a bearing gland 55 and is installed on the front end surface of the bearing seat 54 to press the outer ring of the bearing 51, a second belt wheel 22 is fixedly connected with a rear end flange 321 of the nut 32, so that the second belt wheel 22 drives the nut 32 to rotate together and is positioned on the front end surface of an ejection guide plate 41, to position the assembled assembly in place on the ejector guide plate 41.

Claims

1. The utility model provides a full-electric ejecting device, includes motor element, synchronous pulley subassembly, lead screw pair, central ejecting subassembly, the lead screw pair by the lead screw and with lead screw complex nut constitute its characterized in that: the motor assembly drives the nut to rotate through the synchronous pulley assembly, the lead screw drives the central ejection assembly to axially move, the central ejection assembly comprises an ejection guide plate and a main ejection rod, the axial rear end of the lead screw is fixedly connected with the front end face of the ejection guide plate, the axial front end of the main ejection rod is fixedly connected with the rear end face of the ejection guide plate, and the lead screw is coaxial with the main ejection rod.

2. An all-electric ejection device according to claim 1, wherein: the full-electric ejection device also comprises a lead screw supporting assembly, wherein the lead screw supporting assembly consists of a bearing, a lead screw sleeve, a fastening nut, a bearing seat and a bearing gland, the bearing sleeve is arranged outside the screw nut in a sleeved mode, the rear end of an inner ring of the bearing is pressed by a rear end flange of the screw nut, the lead screw sleeve is arranged outside the screw nut in a sleeved mode, the front end of the inner ring of the bearing is pressed by the lead screw sleeve, the fastening nut is in threaded connection with the front end of the screw nut to tightly press the bearing, the bearing seat is arranged outside the bearing in a sleeved mode, a rear end oil seal is arranged between the inner side of the rear end of the bearing seat and the outer wall of the rear end flange of the screw nut, the bearing gland is fixedly connected with the front end of the bearing seat, and a front end oil seal is arranged between the rear end of the bearing gland and the outer wall of the lead screw sleeve, the bearing seat is characterized in that a lubricating oil joint for providing lubricating oil for the bearing is arranged on the top of the bearing seat, an oil drainage hole for draining redundant lubricating oil is formed in the bottom of the bearing seat, and a plug is arranged on the oil drainage hole.

3. An all-electric ejection device according to claim 2, wherein: the motor element comprises servo motor, synchronous pulley element comprises first band pulley, second band pulley and hold-in range, first band pulley set up in servo motor's output shaft on, the second band pulley cover locate the rear end of lead screw on, the second band pulley with the rear end flange fixed connection of screw, the hold-in range around locate first band pulley with the second band pulley on.

4. An all-electric ejection device according to claim 2 or 3, wherein: the four corners of the ejection guide plate are respectively and movably provided with a guide rod, the axis of each guide rod is parallel to the axis of the main ejection rod, the axial front end of each guide rod is connected with the bearing seat through a connecting plate, and the rear end of each guide rod is connected with a movable template of the injection molding machine.

5. An all-electric ejection device according to claim 4, wherein: the ejection guide plate is movably provided with at least one limiting rod, the axis of the limiting rod is parallel to the axis of the main ejection rod, the axial front end of the limiting rod is provided with a limiting stop block used for limiting excessive axial movement of the ejection guide plate during retraction, and the rear end of the limiting rod is connected with a movable template of the injection molding machine.

6. An all-electric ejection device according to claim 5, wherein: the ejection guide plate is provided with four auxiliary ejection rods, the four auxiliary ejection rods are distributed around the main ejection rod, and the axes of the auxiliary ejection rods are parallel to the axis of the main ejection rod.

7. An all-electric ejection device according to claim 1, wherein: the central position of the rear end face of the ejecting guide plate is fixed with a fixed sleeve through a fastener, and the axial front end of the main ejecting rod is in threaded connection with the fixed sleeve.