Small-gap feeding device of injection molding machine

Abstract

The utility model relates to a feeding device of a small-gap injection molding machine, an injection screw rod is positioned in an injection box body and is sleeved with a screw rod nut, the screw rod nut is fixedly connected with a glue injection screw rod from the end part through a transmission shaft, the feeding device comprises a feeding turntable and a driving piece, and the feeding turntable is rotationally connected onto the injection box body around the direction of the center line of the feeding turntable; the feeding device further comprises an auxiliary frame fixedly connected to the lead screw nut and / or the transmission shaft, the auxiliary frame extends in the length direction of the injection lead screw, the feeding rotary disc is slidably connected to the auxiliary frame, and the center line of the feeding rotary disc coincides with the center line of the transmission shaft. On one hand, the auxiliary frame assists the center line of the feeding turntable to coincide with the center line of the transmission shaft, and rolling friction is formed between the feeding turntable and the auxiliary frame, so that the center positioning accuracy of the transmission shaft can be accurately controlled in the feeding process, and stable feeding is ensured; on the other hand, friction force generated between the feeding turntable and the auxiliary frame is small, abrasion is effectively reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of injection molding machines, and in particular relates to a feeding device for a small gap injection molding machine. Background Art

[0002] The injection device of the injection molding machine mainly realizes four actions: 1) Injection: the injection motor drives the injection screw located in the injection box to push the injection screw forward; 2) Pressure holding: keep the pressure of the mold cavity and the material pipe unchanged for a period of time, and the injection motor continues to work; 3) Feeding: the feeding motor drives the injection screw to rotate (the injection screw can only rotate in one direction); 4) Back release: when the feeding motor drives the injection screw to rotate, the pressure in the front section of the screw will become greater and greater to generate back pressure. At this time, the injection screw needs to move backward to release the back pressure. At this time, the feeding motor and the injection motor work at the same time.

[0003] At present, there is an injection molding machine. In order to realize the linkage between the injection screw and the injection lead screw, a lead screw nut with threaded matching is arranged on the injection lead screw. The lead screw nut is fixedly connected to the injection screw through a transmission shaft, wherein a turntable driven by a feeding motor is sleeved on the transmission shaft, and a keyway is formed between the turntable and the rotating shaft. Therefore, when the turntable is stationary, the injection lead screw rotates, and the lead screw nut drives the injection screw to move linearly through the transmission shaft for injection; when the turntable rotates in the opposite direction relative to the injection lead screw, the injection screw, the transmission shaft and the lead screw nut rotate synchronously in the opposite direction to perform the feeding action.

[0004] However, in the actual production process, in the existing injection molding machine, since the drive shaft moves in a linear direction relative to the turntable when feeding, a certain gap is required between the turntable and the drive shaft so as not to affect the linear motion of the drive shaft. However, in this way, it is difficult to accurately control the center positioning accuracy of the drive shaft (there is a deviation from the center line of the turntable), which can easily cause an adverse effect on the feeding process. In addition, the friction between the turntable and the drive shaft is large, the loss is high, and the service life is short. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an improved feeding device for a small gap injection molding machine.

[0006] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0007] A feeding device for a small gap injection molding machine, wherein an injection screw is located in an injection box and is sleeved with a screw nut, and the screw nut is fixedly connected to the injection screw from the end through a transmission shaft, the feeding device comprises a feeding turntable and a driving member, the feeding turntable rotates around its own center line direction and is connected to the injection box; the feeding device also comprises an auxiliary frame fixedly connected to the screw nut and / or the transmission shaft, wherein the auxiliary frame extends along the length direction of the injection screw, the feeding turntable is slidably connected to the auxiliary frame, and the center line of the feeding turntable coincides with the center line of the transmission shaft, when feeding, the driving member drives the feeding turntable to rotate around its own center line, the screw nut, the transmission shaft, the injection screw and the auxiliary frame rotate synchronously and move along the length direction of the injection screw, and rolling friction is formed between the feeding turntable and the auxiliary frame.

[0008] According to a specific implementation and preferred aspect of the utility model, the auxiliary frame includes a first end plate and a second end plate fixedly connected to the screw nut and / or the transmission shaft and spaced along the length direction of the injection screw, a sliding rod connected between the first end plate and the second end plate and extending along the length direction of the injection screw, and the feeding turntable is slidably connected to the sliding rod. Here, the structure is simple, easy to assemble and implement.

[0009] Preferably, there are one or more slide bars, and each slide bar is spaced apart from the screw nut and / or the transmission shaft. Here, the position of each slide bar is related to the actual assembly working condition to avoid interference.

[0010] Preferably, there are multiple slide bars, which are spaced apart around the center line of the ejection screw rod. This can improve the stability of the feeding turntable during rotation.

[0011] Preferably, a linear bearing is sleeved on the slide bar, a mounting hole matching the linear bearing is formed on the feeding turntable, and the feeding turntable is sleeved on the linear bearing from the mounting hole. Here, the linear bearing has the advantages of low friction, reliable structure, strong bearing capacity, high long-distance running accuracy, and long service life.

[0012] Preferably, the first end plate is sleeved and fixedly connected to the joint between the screw nut and the transmission shaft; the second end plate is fixedly connected to the end of the screw nut away from the transmission shaft. In this way, not only the probability of deformation of the screw nut caused by the instantaneous start of the feeding turntable is effectively reduced, but also the transmission performance between the screw nut and the transmission shaft can be enhanced, so as to realize the precise movement of the injection screw.

[0013] Specifically, the butt joint ends of the screw nut and the transmission shaft are respectively formed with a first step and a second step protruding outward, the first end plate is located between the first step and the second step, and the three are fixedly connected by bolts.

[0014] According to another specific implementation and preferred aspect of the utility model, a mounting groove is formed in the injection box, wherein a rolling bearing is embedded in the mounting groove, a plug-in portion matching the rolling bearing is formed on the surface of the feeding turntable, and the feeding turntable is plugged into the rolling bearing from the plug-in portion. Hereby, the feeding turntable is accurately positioned in the injection box.

[0015] Preferably, the rolling bearing is a deep groove ball bearing.

[0016] Preferably, a mounting hole penetrating the feeding turntable is formed on the plug-in portion, and during assembly, the linear bearing, the plug-in portion and the rolling bearing are distributed in sequence from the inside to the outside.

[0017] In addition, the feeding turntable adopts a gear, and the output shaft of the driving member is provided with a transmission gear meshing with the feeding turntable.

[0018] Due to the implementation of the above technical solution, the utility model has the following advantages compared with the prior art:

[0019] The prior art injection molding machine has the defects of being difficult to accurately control the center positioning accuracy of the transmission shaft, and the large friction between the turntable and the transmission shaft resulting in a short service life when feeding. The present application designs the structure of the feeding device of the small gap injection molding machine as a whole, and cleverly solves the deficiencies and defects of the prior art. After adopting the feeding device, when feeding, the driving member drives the feeding turntable to rotate around its own center line, and the auxiliary frame rotates accordingly and drives the screw nut, the transmission shaft and the injection screw to rotate synchronously, and under the thread cooperation of the screw nut and the injection screw, the screw nut, the transmission shaft, the injection screw and the auxiliary frame rotate synchronously. The auxiliary frame moves synchronously along the length direction of the injection screw, and in the relative movement of the auxiliary frame and the feeding turntable, rolling friction is formed between the auxiliary frame and the feeding turntable. Therefore, compared with the prior art, the utility model, on the one hand, uses the auxiliary frame to assist the center line of the feeding turntable to coincide with the center line of the transmission shaft, and rolling friction is formed between the feeding turntable and the auxiliary frame, and the gap between the two is small, so that the center positioning accuracy of the transmission shaft can be accurately controlled during the feeding process to ensure stable feeding; on the other hand, the friction generated between the feeding turntable and the auxiliary frame is small, which effectively reduces wear and improves service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the small gap injection molding machine feeding device of this embodiment (partially omitted);

[0021] Figure 2 for Figure 1 Schematic diagram of structural decomposition;

[0022] Figure 3 for Figure 1 A half-section schematic diagram of the local structure;

[0023] Among them: 1, feeding turntable; 10, plug-in part; k, mounting hole;

[0024] 2. Driving member; 20. Transmission gear;

[0025] 3. Auxiliary frame; 31. First end plate; 32. Second end plate; 33. Sliding rod; 330. Linear bearing;

[0026] T, injection box; T0, mounting groove; T1, rolling bearing; G1, injection screw; G2, injection screw; M, screw nut; Z, transmission shaft; t1, first step; t2, second step. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] like Figures 1 to 3 As shown, the feeding device of the small gap injection molding machine of this embodiment includes a feeding turntable 1, a driving member 2, and an auxiliary frame 3. The injection screw G1 of this embodiment is located in the injection box T and is sleeved with a screw nut M, and the screw nut M is fixedly connected to the injection screw G2 from the end through the transmission shaft Z.

[0034] Specifically, the feeding turntable 1 is connected to the injection box T so as to rotate around its own center line, wherein the center line of the feeding turntable 1 coincides with the center line of the injection screw G1; in some specific embodiments, a mounting groove T0 is formed in the injection box T, wherein a rolling bearing T1 is embedded in the mounting groove T0, and a plug-in portion 10 matching the rolling bearing T1 is formed on the disk surface of the feeding turntable 1, and the feeding turntable 1 is inserted into the rolling bearing T1 from the plug-in portion 10. Preferably, the rolling bearing T1 in this embodiment adopts a deep groove ball bearing.

[0035] At the same time, the feeding turntable 1 is a gear with a center hole in the middle, and the ejector screw G1 and the driving member 2 are located above the feeding turntable 1, and the output shaft of the driving member 2 is provided with a transmission gear 20 meshing with the feeding turntable 1, and under the drive of the driving member 2, the feeding turntable 1 rotates around its own center line.

[0036] In this example, the auxiliary frame 3 is fixedly connected to the screw nut M and / or the transmission shaft Z, wherein the auxiliary frame 3 extends along the length direction of the injection screw G1, the feeding turntable 1 is slidably connected to the auxiliary frame 3, and the center line of the feeding turntable 1 coincides with the center line of the transmission shaft Z. When feeding, the driving member 2 drives the feeding turntable 1 to rotate around its own center line, the screw nut M, the transmission shaft Z, the injection screw G2 and the auxiliary frame 3 rotate synchronously and move along the length direction of the injection screw G1, and rolling friction is formed between the feeding turntable 1 and the auxiliary frame 3.

[0037] Specifically, the auxiliary frame 3 includes a first end plate 31 and a second end plate 32 fixedly connected to the screw nut M and / or the transmission shaft Z and spaced apart along the length direction of the injection screw G1, a sliding rod 33 connected between the first end plate 31 and the second end plate 32 and extending along the length direction of the injection screw G1, and the feeding turntable 1 is slidably connected to the sliding rod 33.

[0038] The first end plate 31 is sleeved and fixedly connected to the joint of the screw nut M and the transmission shaft Z; the second end plate 32 is fixedly connected to the end of the screw nut M away from the transmission shaft Z. In order to facilitate assembly and implementation, the joint ends of the screw nut M and the transmission shaft Z are respectively formed with a first step t1 and a second step t2 protruding outward, the first end plate 31 is located between the first step t1 and the second step t2, and the three are fixedly connected by bolts; the second end plate 32 is fixedly connected to the end surface of the screw nut M away from the transmission shaft Z by bolts.

[0039] There are multiple slide bars 33, which are spaced apart around the center line of the ejection screw G1. In some specific embodiments, there are two slide bars 33, which are symmetrically distributed on opposite sides of the screw nut M.

[0040] In order to further facilitate implementation, a mounting hole k corresponding to the two slide bars 33 and passing through the feeding turntable 1 is formed on the plug-in portion 10 in the feeding turntable 1; each slide bar 33 is sleeved with a linear bearing 330 matching the mounting hole k. During assembly, the feeding turntable 1 is sleeved on each linear bearing 330 from each mounting hole k, and the linear bearings 330, the plug-in portion 10, and the rolling bearing T1 are distributed in sequence from the inside to the outside.

[0041] In summary, after adopting the feeding device, when feeding, the driving member drives the feeding turntable to rotate around its own center line, and the auxiliary frame rotates accordingly and drives the screw nut, the transmission shaft and the injection screw to rotate synchronously, and under the thread cooperation of the screw nut and the injection screw, the screw nut, the transmission shaft, the injection screw and the auxiliary frame move synchronously along the length direction of the injection screw, and in the relative movement of the auxiliary frame and the feeding turntable, rolling friction is formed between the auxiliary frame and the feeding turntable. Therefore, compared with the prior art, the utility model, on the one hand, assists the center line of the feeding turntable to coincide with the center line of the transmission shaft through the auxiliary frame, and rolling friction is formed between the feeding turntable and the auxiliary frame. The gap between the two is small, so that the center positioning accuracy of the transmission shaft can be accurately controlled during the feeding process to ensure stable feeding; on the other hand, the friction generated between the feeding turntable and the auxiliary frame is small, which effectively reduces wear and improves service life; thirdly, linear bearings are used, which have the advantages of low friction, reliable structure, strong load-bearing capacity, high long-distance running accuracy, and long service life; fourthly, the auxiliary frame of the present application is used, which not only effectively reduces the probability of deformation of the screw nut caused by instantaneous start-up of the feeding turntable, but also can enhance the transmission performance between the screw nut and the transmission shaft, and realize precise movement of the injection screw; fifthly, the structure is simple and easy to assemble and implement

[0042] The above detailed description of the utility model is intended to enable people familiar with the technology in this field to understand the content of the utility model and implement it. It is not intended to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A feeding device for a small gap injection molding machine, wherein the injection screw is located in the injection box and is sleeved with a screw nut, and the screw nut is fixedly connected to the injection screw from the end through a transmission shaft, and the feeding device includes a feeding turntable and a driving member, characterized in that: The feeding turntable rotates around its own center line and is connected to the injection box; The feeding device also includes an auxiliary frame fixedly connected to the screw nut and / or the transmission shaft, wherein the auxiliary frame extends along the length direction of the injection screw, the feeding turntable is slidably connected to the auxiliary frame, and the feeding turntable coincides with the center line of the transmission shaft. During feeding, the driving member drives the feeding turntable to rotate around its own center line, and the screw nut, the transmission shaft, the injection screw and the auxiliary frame rotate synchronously and move along the length direction of the injection screw, and rolling friction is formed between the feeding turntable and the auxiliary frame.

2. The small gap injection molding machine feeding device according to claim 1, characterized in that: The auxiliary frame includes a first end plate and a second end plate fixedly connected to the screw nut and / or the transmission shaft and spaced apart along the length direction of the injection screw, a sliding rod connected between the first end plate and the second end plate and extending along the length direction of the injection screw, and the feeding turntable is slidably connected to the sliding rod.

3. The small gap injection molding machine feeding device according to claim 2, characterized in that: There are one or more sliding rods, and each sliding rod is spaced apart from the screw nut and / or the transmission shaft.

4. The small gap injection molding machine feeding device according to claim 2 or 3, characterized in that: There are multiple slide rods, which are spaced apart around the center line of the injection screw; and / or, a linear bearing is sleeved on the slide rod, a mounting hole matching the linear bearing is formed on the feeding turntable, and the feeding turntable is sleeved on the linear bearing from the mounting hole.

5. The small gap injection molding machine feeding device according to claim 2, characterized in that: The first end plate is sleeved and fixedly connected to the joint between the screw nut and the transmission shaft; the second end plate is fixedly connected to the end of the screw nut away from the transmission shaft.

6. The small gap injection molding machine feeding device according to claim 5, characterized in that: The butt joint ends of the screw nut and the transmission shaft are respectively formed with a first step and a second step protruding outwards, the first end plate is located between the first step and the second step, and the three are fixedly connected by bolts.

7. The small gap injection molding machine feeding device according to claim 4, characterized in that: The injection box is formed with a mounting groove, wherein a rolling bearing is embedded in the mounting groove, and a plug-in portion matching the rolling bearing is formed on the disk surface of the feeding turntable, and the feeding turntable is plugged onto the rolling bearing from the plug-in portion.

8. The small gap injection molding machine feeding device according to claim 7, characterized in that: The rolling bearing adopts a deep groove ball bearing.

9. The small gap injection molding machine feeding device according to claim 7, characterized in that: The plug-in portion is formed with the mounting hole penetrating the feeding turntable, and during assembly, the linear bearing, the plug-in portion and the rolling bearing are sequentially distributed from the inside to the outside.

10. The small gap injection molding machine feeding device according to claim 1, characterized in that: The feeding turntable adopts a gear, and the output shaft of the driving member is provided with a transmission gear meshing with the feeding turntable.

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