A feeding mechanism for injection molding machines used in plastic parts production

Abstract

This utility model relates to the field of plastic parts manufacturing technology, specifically to a feeding mechanism for an injection molding machine used in plastic parts production. The mechanism includes a feeding channel; a feeding control unit located between the inside and outside of the feeding channel for controlling the feeding amount; a vertical shaft rotatably mounted on the top of the extrusion cylinder and a horizontal bar radially fixed to the outside of the vertical shaft, with a torsion spring outside the vertical shaft for driving its reset; and a linkage unit located between the outer end of the auger shaft and the horizontal bar for intermittently deflecting the horizontal bar by a certain angle. This utility model, by inserting two gates opposite each other within the feeding channel and cooperating with the power transmission of a rack and pinion mechanism, causes the two gates to open and close once per revolution of the auger shaft, achieving quantitative feeding based on the auger shaft's rotation speed. Furthermore, by adjusting the length of the overlapping portion between the extension strip and the horizontal bar, the angle at which the extension strip deflects the horizontal bar is adjusted, and the opening and closing distance of the two gates is simultaneously adjusted, further improving the accuracy of the feeding amount.

Description

Technical Field

[0001] This utility model relates to the field of plastic parts manufacturing technology, and in particular to a feeding mechanism for an injection molding machine used in plastic parts manufacturing. Background Technology

[0002] In the production of plastic products, bottle-shaped plastic products are generally produced using blow molding, while more complex three-dimensional plastic products require injection molding. A screw injection molding machine uses high pressure to extrude a fixed quantity of molten raw material into the mold cavity, where it is then cooled and shaped by a cooling system. During the production process, the mold used at the output end of the injection molding machine is generally detachable, allowing for the customization of special molds according to customer needs. By changing the mold at the output end of the injection molding machine, various three-dimensional plastic products can be produced within the maximum single injection volume.

[0003] When the mold is changed, the product shape and volume change, and the cooling and setting time will also change accordingly. It is necessary to adjust the screw (auger shaft) speed and the amount of raw material fed into the extrusion barrel simultaneously. However, the feeding amount of existing injection molding machines is difficult to adjust accurately and synchronously, which has a significant impact on the stability of long-term injection molding. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a feeding mechanism for an injection molding machine used in the production of plastic parts, so as to solve the problem that the feeding amount is difficult to adjust accurately and synchronously, which has a significant impact on the stability of long-term injection molding.

[0005] To achieve the above objectives, this utility model provides a feeding mechanism for an injection molding machine used in the production of plastic parts, including a feeding channel; The feeding control unit is located between the inside and outside of the feeding channel, and is used to control the feeding amount; A vertical shaft located at the top of the extrusion cylinder and a horizontal bar radially fixed to the outside of the vertical shaft are rotated. A torsion spring for driving the vertical shaft to return to its original position is provided outside the vertical shaft. The linkage is located between the outer end of the auger shaft and the crossbar, and it is used to intermittently deflect the crossbar by a certain angle. The linkage unit includes an external disk fixed to the outer end of the auger shaft. The outer disk has an axially arranged screw hole at its boundary. A square hole is coaxially arranged on the inner end face of the screw hole and passes through the outer disk. An adjusting screw threaded into a screw hole; The extension strip, which is slidably placed inside the square hole, is moved by turning the adjusting screw, thereby adjusting the length of the part of the extension strip that overlaps with the crossbar and thus adjusting the angle of the crossbar's deflection.

[0006] Preferably, the crossbar is initially coplanar and parallel to the auger shaft, and the crossbar is located outside the feeding channel.

[0007] Preferably, the extension bar corresponds to the crossbar, and the length variation of the extension bar is greater than the length of the crossbar.

[0008] Preferably, the feeding control unit includes a limiting groove that extends laterally through a set of opposing vertical surfaces on the feeding channel, and two gates are slidably disposed inside the limiting groove, with a linkage component between the two gates.

[0009] Preferably, the linkage includes a connecting arm fixed to the outside of the gate on the side away from the inside of the feeding channel. Both ends of the connecting arm are provided with racks. One end of the rack is inserted into a limiting sleeve fixed to the outside of the feeding channel. The limiting sleeve is provided with a linkage tooth that rotates inside. The two sides of the tooth surface of the linkage tooth mesh with two adjacent racks respectively.

[0010] Preferably, the top of the vertical shaft passes through the bottom of the limiting sleeve and extends into its interior, and the top of the vertical shaft is fixedly disposed at the bottom of the linkage tooth.

[0011] Preferably, the torsion spring is sleeved outside the vertical shaft, and the two ends of the torsion spring are respectively fixed outside the vertical shaft and the extrusion cylinder.

[0012] The beneficial effects of this utility model are: This invention inserts two gates opposite each other into the feeding channel, and with the power transmission of the rack and pinion, the two gates open and close once for every revolution of the auger shaft. In this way, the material is fed quantitatively according to the rotation speed of the auger shaft, so that the feeding amount matches the plastic products being produced. Furthermore, by turning the adjusting screw to adjust the length of the overlapping part of the extension strip and the crossbar, the angle at which the extension strip deflects the crossbar is adjusted, thereby indirectly adjusting the spacing between the opening and closing of the two gates, further improving the accuracy of the feeding amount. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ; Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ; Figure 3 This is a three-dimensional illustration of the present invention. Figure 3 ; Figure 4This is a three-dimensional illustration of the present invention. Figure 4 .

[0015] The diagram is marked as follows: 1. Feeding channel; 2. Feeding control unit; 21. Limiting groove; 22. Gate plate; 23. Linkage component; 231. Connecting arm; 232. Rack; 233. Limiting sleeve; 234. Linkage gear; 3. Linkage unit; 31. External disc; 32. Screw hole; 33. Adjusting screw; 34. Square hole; 35. Extension bar; 4. Vertical shaft; 5. Horizontal bar. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] like Figures 1 to 4 As shown, a feeding mechanism for an injection molding machine used in the production of plastic parts includes a feeding channel 1, the top of which is fixedly connected to a feeding hopper via a flange, so as to facilitate feeding raw materials into the continuous phase extrusion cylinder.

[0019] The feeding control unit 2 is located between the inside and outside of the feeding channel 1. It is used to control the feeding amount and improve the coordination between the raw material feeding amount and the product consumption, so as to avoid a large difference between the two and affect the normal operation of the injection molding machine during long-term production.

[0020] A vertical shaft 4 is rotatably mounted on the top of the extrusion cylinder, and a crossbar 5 is radially fixed to the outside of the vertical shaft 4. A torsion spring for driving the vertical shaft 4 to reset is provided on the outside of the vertical shaft 4. The torsion spring is sleeved on the outside of the vertical shaft 4, and the two ends of the torsion spring are respectively fixed to the outside of the vertical shaft 4 and the extrusion cylinder.

[0021] Linkage part 3 is located between the outer end of the auger shaft and the crossbar 5, and is used to intermittently deflect the crossbar 5 by a certain angle.

[0022] The linkage part 3 includes an outer disk 31 fixed to the outer end of the auger shaft. A screw hole 32 is provided axially at the boundary of the outer disk 31. A square hole 34 is provided coaxially on the inner end face of the screw hole 32 and passes through the outer disk 31.

[0023] An adjusting screw 33 is threaded into a screw hole 32.

[0024] The extension strip 35, which is slidably disposed in the square hole 34, is driven to move by turning the adjusting screw 33. This allows the length of the overlapping part of the extension strip 35 and the crossbar 5 to be adjusted, thereby adjusting the deflection angle of the crossbar 5. By setting the feeding control unit 2 in the feeding channel 1, the feeding control unit 2 is driven to operate once for each rotation of the auger shaft. In this way, the feeding can be quantitatively fed according to the rotation speed of the auger shaft, so that the feeding amount matches the melt amount required for the produced plastic products. Furthermore, by turning the adjusting screw 33 to adjust the length of the overlapping part of the extension strip 35 and the crossbar 5, the deflection angle of the crossbar 5 caused by the extension strip 35 can be adjusted, further improving the accuracy of the feeding amount.

[0025] like Figures 1 to 3 As shown, the crossbar 5 is initially coplanar and parallel to the auger shaft. The crossbar 5 is located outside the feeding channel 1. This design facilitates the linkage between the auger shaft and the crossbar 5, and reduces the space occupied by the linkage part 3 and the feeding control part 2 outside the extrusion cylinder.

[0026] like Figures 1 to 3 As shown, the extension bar 35 corresponds to the crossbar 5, and the length variation of the extension bar 35 is greater than the length of the crossbar 5.

[0027] This design allows the extension bar 35 to deflect the crossbar 5 at smaller angles as the overlap length is smaller, and vice versa. The deflection angle of the crossbar 5 is within the range of 0° to 90° (excluding 0° and 90°). This can be linked with the feeding control unit 2 to adjust the size of the opening of the gate 22, enabling more precise control of the feeding amount and improving the matching between the raw material feeding amount and the production quality and efficiency of plastic products.

[0028] like Figures 1 to 4 As shown, the feeding control unit 2 includes a limiting groove 21 that runs horizontally through one of the opposing vertical surfaces on the feeding channel 1. Two gates 22 are slidably disposed inside the limiting groove 21, and a linkage 23 is disposed between the two gates 22.

[0029] The linkage 23 includes a connecting arm 231 fixed to the outside of the gate 22 away from the inside of the feeding channel 1. Both ends of the connecting arm 231 are provided with racks 232. One end of the rack 232 is inserted and connected to a limiting sleeve 233 fixed to the outside of the feeding channel 1. The limiting sleeve 233 is provided with a linkage tooth 234 inside. The two sides of the tooth surface of the linkage tooth 234 respectively mesh with two adjacent racks 232.

[0030] The top of the vertical shaft 4 passes through the bottom of the limiting sleeve 233 and extends into it. The top of the vertical shaft 4 is fixedly located at the bottom of the linkage tooth 234. This design allows the vertical shaft 4 to be linked with one of the linkage teeth 234, enabling them to rotate synchronously in the same direction. When the extension bar 35 deflects the crossbar 5 once, it synchronously drives the linkage tooth 234 to deflect, causing it to drive the two adjacent racks 232 to move in opposite directions, thus pushing the two gates 22 away from each other. When the extension bar 35 separates from the crossbar 5, the torque accumulated by the torsion spring during the deflection of the crossbar 5 pushes the vertical shaft 4 to reset and deflect, thereby driving the two gates 22 to close. This completes one opening and closing of the gates 22, ensuring that the opening and closing of the gates 22 is consistent with the number of rotations of the auger shaft. This allows for quantitative feeding of raw materials, reduces the error in the amount of material fed each time, and improves the stability of feeding.

[0031] When the auger shaft rotates once, it drives the outer disk 31, adjusting screw 33 and outer extension strip 35 to rotate synchronously in the same direction. During this process, the end of the outer extension strip 35 away from the outer disk 31 contacts the crossbar 5 once in the same horizontal plane. This pushes the crossbar 5 to deflect at a certain angle and then separates it. The crossbar 5 will deflect and reset under the torque of the torsion spring, realizing the intermittent deflection of the crossbar 5 and driving the linkage 23 to operate once. This pushes the two gates 22 away from each other and then closes them again, realizing the opening and closing of the two gates 22 once. The number of times the gates 22 open and close is synchronized with the number of rotations of the auger shaft, realizing the quantitative feeding of raw materials into the extrusion cylinder. Before feeding, the outer extension strip 35 is driven to move axially by turning the adjusting screw 33, realizing the adjustment of the length of the overlapping part of the outer extension strip 35 and the crossbar 5, further improving the feeding accuracy of raw materials, so that the amount of raw materials fed matches the amount of plastic products used in production, improving the production quality of plastic products, reducing the difference range of raw material feeding each time, and improving the stability of raw material supply.

[0032] Working principle: When the auger shaft rotates one revolution, it drives the outer disk 31, adjusting screw 33 and outer extension strip 35 to rotate synchronously in the same direction. During this process, the end of the outer extension strip 35 away from the outer disk 31 contacts the crossbar 5 once in the same horizontal plane, which pushes the crossbar 5 to deflect at a certain angle and then separates it. The crossbar 5 will deflect and reset under the torque of the torsion spring, realizing the intermittent deflection of the crossbar 5 and driving the linkage 23 to operate once, which pushes the two gates 22 away from each other and then closes them, realizing the opening and closing of the two gates 22 once. The number of times the gates 22 open and close is synchronized with the number of revolutions of the auger shaft, realizing the quantitative feeding of raw materials into the extrusion cylinder. Before feeding, the outer extension strip 35 is driven to move axially by turning the adjusting screw 33, realizing the adjustment of the length of the overlapping part of the outer extension strip 35 and the crossbar 5, further improving the feeding accuracy of raw materials, so that the amount of raw materials fed matches the amount of plastic products used in production, improving the production quality of plastic products, reducing the difference range of raw material feeding each time, and improving the stability of raw material supply.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0034] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A feeding mechanism for an injection molding machine used in the production of plastic parts, comprising a feeding channel (1), characterized in that: The feeding control unit (2) is located between the inside and outside of the feeding channel (1) and is used to control the feeding amount; Rotate the vertical shaft (4) located at the top of the extrusion cylinder and the crossbar (5) radially fixed outside the vertical shaft (4). The outside of the vertical shaft (4) is provided with a torsion spring for driving the vertical shaft (4) to return to its original position. The linkage part (3) is located between the outer end of the auger shaft and the crossbar (5), and is used to intermittently deflect the crossbar (5) by a certain angle; The linkage part (3) includes an external disk (31) fixed on the outer end of the auger shaft. The external disk (31) has an axially provided screw hole (32) at its boundary. The inner end face of the screw hole (32) has a square hole (34) that is coaxially provided and passes through the external disk (31). An adjusting screw (33) is threaded into a screw hole (32); The extension bar (35) is slidably placed in the square hole (34). By turning the adjusting screw (33), the extension bar (35) is driven to move, so as to adjust the length of the overlapping part of the extension bar (35) and the crossbar (5) to adjust the angle of the crossbar (5).

2. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 1, characterized in that, The crossbar (5) is initially coplanar and parallel to the auger shaft, and the crossbar (5) is located outside the feeding channel (1).

3. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 1, characterized in that, The extension bar (35) corresponds to the crossbar (5), and the length variation of the extension bar (35) is greater than the length of the crossbar (5).

4. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 1, characterized in that, The feeding control unit (2) includes a limiting groove (21) that runs horizontally through one of the opposite vertical surfaces on the feeding channel (1). Two gates (22) are slidably arranged inside the limiting groove (21), and a linkage (23) is provided between the two gates (22).

5. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 4, characterized in that, The linkage component (23) includes a connecting arm (231) fixed to the outside of the gate (22) away from the inside of the feeding channel (1). Both ends of the connecting arm (231) are provided with racks (232). One end of the rack (232) is inserted and connected to a limiting sleeve (233) fixed to the outside of the feeding channel (1). The limiting sleeve (233) is provided with a linkage tooth (234) inside. The two sides of the tooth surface of the linkage tooth (234) respectively mesh with two adjacent racks (232).

6. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 5, characterized in that, The top of the vertical shaft (4) passes through the bottom of the limiting sleeve (233) and extends into its interior, and the top of the vertical shaft (4) is fixedly located at the bottom of the linkage tooth (234).

7. The feeding mechanism for an injection molding machine for producing plastic parts according to claim 1, characterized in that, The torsion spring is sleeved on the outside of the vertical shaft (4), and the two ends of the torsion spring are respectively fixed on the outside of the vertical shaft (4) and the extrusion cylinder.

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