Hot runner system structure of servo control valve needle

Abstract

The utility model discloses a hot runner system structure of a servo control valve needle. The hot runner system structure comprises a groove body which is arranged on the outer surface of a fixed mold and is used for accommodating a synchronous belt, a driving wheel, a plurality of synchronous wheels and a pair of idle wheels, the pair of idle wheels are rotationally arranged on the pair of sliding seats in a one-to-one correspondence manner; a sliding chute for accommodating the pair of sliding seats is also formed in the outer surface of the fixed mold; a screw rod is arranged in the sliding chute and penetrates through the pair of sliding seats; the pair of sliding seats are respectively provided with threaded through holes which are penetrated by the screw rod and are in threaded fit with the screw rod; the two ends of the screw are rotationally connected with the inner wall of the sliding groove through supporting bearings correspondingly, and the screw is further provided with a driving mechanism for driving the screw to rotate. According to the hot runner system structure of the servo control valve needle, the displacement of the plurality of valve needles can be simultaneously controlled through the driving wheel, the synchronous belt and the plurality of synchronous wheels, so that the plurality of valve needles are synchronously opened and closed; and the tensioning degree of the synchronous belt can be adjusted through the pair of idle wheels, and then it is guaranteed that the driving wheel can stably drive the multiple synchronous wheels.

Description

Technical Field

[0001] This utility model relates to a hot runner system structure for a servo-controlled valve needle. Background Technology

[0002] Chinese patent application number 201920046185.8 discloses a hot runner system structure for servo-controlled valve needles, which can simultaneously control the displacement of multiple valve needles, enabling multiple valve needles to open and close synchronously.

[0003] The patented servo-controlled valve needle hot runner system structure includes: a fixed mold, a runner plate located inside the fixed mold, multiple valve needles penetrating the runner plate, a valve needle positioning plate located inside the fixed mold and fixed to the outer ends of each valve needle, multiple lead screw positioning seats located on the valve needle positioning plate, multiple lead screws that are threadedly engaged with the multiple lead screw positioning seats, multiple synchronous pulleys located at the outer ends of each lead screw, a drive wheel that drives the multiple synchronous pulleys to rotate synchronously via a synchronous belt, a drive mechanism (including a servo motor and a reducer) that drives the drive wheel to rotate, a pair of idler pulleys fixed to the fixed mold and located on both sides of the drive wheel for tensioning the synchronous belt inward, and a groove located on the outer surface of the fixed mold for accommodating the synchronous belt, drive wheel, multiple synchronous pulleys and a pair of idler pulleys.

[0004] The working principle of the hot runner system structure of the servo-controlled valve needle in this patent includes:

[0005] The drive mechanism (servo motor and reducer) drives the drive wheel to rotate forward or in reverse. The drive wheel drives multiple synchronous pulleys to rotate forward or in reverse synchronously via a synchronous belt. The synchronous pulleys drive the corresponding lead screw to rotate forward or in reverse. The lead screw drives the valve needle positioning plate to move along the valve needle penetration direction via the lead screw positioning seat (making the valve needle positioning plate move closer to or away from the flow channel plate). The valve needle positioning plate drives multiple valve needles to move synchronously relative to the flow channel plate, thereby realizing the synchronous opening and closing of multiple valve needles.

[0006] Furthermore, a pair of idler pulleys tension the timing belt inward, pressing the timing belt against the driving pulley and multiple timing pulleys, so that the driving pulley can drive multiple timing pulleys through the timing belt.

[0007] Although the hot runner system structure of the patented servo control valve needle can tension the synchronous belt inward through a pair of idler pulleys, pressing the synchronous belt against the drive pulley and multiple synchronous pulleys; however, the pair of idler pulleys are fixed to the fixed mold, so the distance between the pair of idler pulleys cannot be adjusted, and consequently the degree to which the pair of idler pulleys tension the synchronous belt inward cannot be adjusted, that is, the tension of the synchronous belt cannot be adjusted. This may result in problems such as the synchronous belt not being tensioned in place or being over-tensioned inward. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this utility model provides a hot runner system structure for servo-controlled valve needles, comprising: a fixed mold; a runner plate disposed inside the fixed mold; multiple valve needles penetrating the runner plate; a valve needle positioning plate disposed inside the fixed mold and fixedly connected to the outer ends of each valve needle; multiple lead screw positioning seats disposed on the valve needle positioning plate; multiple lead screws threadedly engaged with the multiple lead screw positioning seats; multiple synchronous pulleys disposed at the outer ends of each lead screw; a drive wheel that drives the multiple synchronous pulleys to rotate synchronously via a synchronous belt; a drive mechanism (including a servo motor and a reducer) that drives the drive wheel to rotate; a pair of idler pulleys disposed on both sides of the drive wheel for tensioning the synchronous belt inward; and a groove disposed on the outer surface of the fixed mold for accommodating the synchronous belt, the drive wheel, the multiple synchronous pulleys, and the pair of idler pulleys.

[0009] The pair of idler wheels are rotatably mounted on a pair of slide blocks in a corresponding manner. The outer surface of the fixed mold is also provided with a groove for accommodating the pair of slide blocks. The groove is lower than the groove body and spans the groove body. A screw is placed in the groove and passes through the pair of slide blocks. The screw extends in the same direction as the groove. The pair of slide blocks are respectively provided with threaded through holes that are penetrated by the screw and threaded with the screw. The threads of the threaded through holes of the pair of slide blocks are in opposite directions.

[0010] Both ends of the screw are rotatably connected to the inner wall of the groove through support bearings, and the screw is also equipped with a drive mechanism to drive its rotation.

[0011] Preferably, the groove is provided along the length of the fixed mold.

[0012] Preferably, the driving mechanism includes: a worm gear fixed to one end of the screw and coaxial with the screw, and a worm wheel cooperating with the worm gear; the axle of the worm wheel is rotatably connected to the fixed mold, and the outer end of the axle is provided with an internal hexagonal hole.

[0013] Preferably, the outer surface of the fixed mold is further provided with a groove for accommodating the worm gear, the groove is connected to the slide groove, and the groove and the slide groove extend in the same direction.

[0014] Preferably, the worm is rotatably connected to the inner wall of the groove at its end furthest from the screw via an end bearing.

[0015] Preferably, the outer surface of the fixed mold is further provided with a groove for accommodating the worm gear, the groove being located on one side of the rod groove and communicating with the rod groove.

[0016] Preferably, the axle of the worm gear is rotatably connected to the bottom wall of the groove via an internal bearing.

[0017] Preferably, the axle of the worm gear is perpendicular to the outer surface of the fixed mold.

[0018] The advantages and beneficial effects of this utility model are as follows: It provides a hot runner system structure for servo-controlled valve needles, which can simultaneously control the displacement of multiple valve needles through a drive wheel, a timing belt, and multiple timing pulleys, so that multiple valve needles open and close synchronously; it can also adjust the tension of the timing belt through a pair of idler pulleys, thereby ensuring that the drive wheel can stably drive multiple timing pulleys.

[0019] This utility model makes partial improvements to the hot runner system structure of the servo control valve needle disclosed in Chinese Patent Application No. 201920046185.8, mainly by adding a structure that adjusts the tension of the synchronous belt through a pair of idler pulleys. This utility model does not improve other parts of that patent; other parts of the hot runner system structure of the servo control valve needle can be found in the patent's description and will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] The specific technical solution of this utility model is as follows:

[0023] like Figure 1 As shown, a hot runner system structure for a servo-controlled valve needle includes: a fixed mold 10, a runner plate disposed inside the fixed mold 10, multiple valve needles penetrating the runner plate, a valve needle positioning plate disposed inside the fixed mold 10 and fixed to the outer end of each valve needle, multiple lead screw positioning seats disposed on the valve needle positioning plate, multiple lead screws that are threadedly engaged with the multiple lead screw positioning seats, multiple synchronous pulleys 6 disposed at the outer end of each lead screw, a drive wheel 14 that drives the multiple synchronous pulleys 6 to rotate synchronously via a synchronous belt 11, a drive mechanism (including a servo motor and a reducer) that drives the drive wheel 14 to rotate, a pair of idler pulleys 12 disposed on both sides of the drive wheel 14 and used to tension the synchronous belt 11 inward, and a groove 10a disposed on the outer surface of the fixed mold 10 for accommodating the synchronous belt 11, the drive wheel 14, the multiple synchronous pulleys 6 and the pair of idler pulleys 12;

[0024] The pair of idler wheels 12 are rotatably mounted on a pair of slide blocks 16 in a one-to-one correspondence. The outer surface of the fixed mold 10 is also provided with a groove 17 for accommodating the pair of slide blocks 16. The groove 17 is arranged along the length direction of the fixed mold 10. The groove 17 is lower than the groove body 10a and spans the groove body 10a. A screw 18 is placed in the groove 17 and passes through the pair of slide blocks 16. The screw 18 extends in the same direction as the groove 17. The pair of slide blocks 16 are respectively provided with threaded through holes through which the screw 18 passes and threadedly engages with the screw 18. The threads of the threaded through holes of the pair of slide blocks 16 are opposite in direction.

[0025] The two ends of the screw 18 are rotatably connected to the inner wall of the slide groove 17 via support bearings 19, and the screw 18 is also equipped with a drive mechanism to drive its rotation.

[0026] The drive mechanism includes: a worm 20 fixed to one end of the screw 18 and coaxial with the screw 18, and a worm wheel 21 cooperating with the worm 20; the axle 22 of the worm wheel 21 is rotatably connected to the fixed mold 10, and the outer end of the axle 22 is provided with an internal hexagonal hole 23;

[0027] The outer surface of the fixed mold 10 is also provided with a rod groove 24 for accommodating the worm 20. The rod groove 24 is connected to the slide groove 17 and extends in the same direction as the slide groove 17. The worm 20 is rotatably connected to the inner wall of the rod groove 24 at its end away from the screw 18 through an end bearing 25.

[0028] The outer surface of the fixed mold 10 is also provided with a groove 26 for accommodating the worm gear 21. The groove 26 is located on one side of the rod groove 24 and is connected to the rod groove 24. The axle 22 of the worm gear 21 is rotatably connected to the bottom wall of the groove 26 through an internal bearing. The axle 22 of the worm gear 21 is perpendicular to the outer surface of the fixed mold 10.

[0029] The working principle of the servo-controlled valve needle hot runner system structure of this utility model includes: the drive mechanism (servo motor and reducer) drives the drive wheel 14 to rotate forward or reverse. The drive wheel 14 drives multiple synchronous wheels 6 to rotate forward or reverse synchronously through the synchronous belt 11. The synchronous wheels 6 drive the corresponding lead screw to rotate forward or reverse. The lead screw drives the valve needle positioning plate to move along the valve needle penetration direction through the lead screw positioning seat (so that the valve needle positioning plate is closer to or farther away from the flow channel plate). The valve needle positioning plate drives multiple valve needles to move synchronously relative to the flow channel plate, thereby realizing the synchronous opening and closing of multiple valve needles.

[0030] Furthermore, a pair of idler pulleys 12 tension the timing belt 11 inward, pressing the timing belt 11 against the drive pulley 14 and multiple timing pulleys 6, so that the drive pulley 14 can drive multiple timing pulleys 6 through the timing belt 11;

[0031] When the tension of the timing belt 11 needs to be adjusted, insert an Allen wrench into the Allen hole 23 at the outer end of the axle 22. By operating the Allen wrench, the axle 22 rotates forward or backward. The worm gear 21 rotates forward or backward synchronously with the axle 22. The worm gear 21 drives the worm 20 to rotate forward or backward, and the worm 20 drives the screw 18 to rotate forward or backward. The screw 18 drives a pair of slides 16 to move closer or further apart. Consequently, a pair of idler pulleys 12 move closer or further apart synchronously with the pair of slides 16. When a pair of idler pulleys 12 move closer together, the timing belt 11 can be further tensioned inward, adjusting the timing belt 11 that is not tensioned enough to the correct tension. When a pair of idler pulleys 12 move further apart, the tension of the timing belt 11 can be reduced, adjusting the timing belt 11 that is over-tensioned to the correct tension. This ensures that the drive pulley 14 can stably drive multiple timing pulleys 6.

[0032] As can be seen from the above, the hot runner system structure of the servo control valve needle of this utility model can simultaneously control the displacement of multiple valve needles through the drive wheel 14, the synchronous belt 11 and multiple synchronous pulleys 6, so that multiple valve needles open and close synchronously; it can also adjust the tension of the synchronous belt 11 through a pair of idler pulleys 12, thereby ensuring that the drive wheel 14 can stably drive multiple synchronous pulleys 6.

[0033] This utility model makes partial improvements to the hot runner system structure of the servo control valve needle disclosed in Chinese Patent Application No. 201920046185.8. The main improvement is the addition of a structure that adjusts the tension of the synchronous belt 11 via a pair of idler pulleys 12. This utility model does not improve other parts of that patent; other parts of the servo control valve needle's hot runner system structure can be found in the patent's description and will not be repeated here.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hot runner system structure for a servo-controlled valve needle, comprising a groove disposed on the outer surface of a fixed mold for accommodating a timing belt, a drive pulley, multiple timing pulleys, and a pair of idler pulleys; characterized in that, The pair of idler wheels are rotatably mounted on a pair of slide blocks in a corresponding manner. The outer surface of the fixed mold is also provided with a groove for accommodating the pair of slide blocks. The groove is lower than the groove body and spans the groove body. A screw is placed in the groove and passes through the pair of slide blocks. The screw extends in the same direction as the groove. The pair of slide blocks are respectively provided with threaded through holes that are threaded through the screw and threaded with the screw. The threads of the threaded through holes of the pair of slide blocks are opposite in direction. The two ends of the screw are respectively rotatably connected to the inner wall of the groove through support bearings. The screw is also equipped with a drive mechanism to drive its rotation.

2. The hot runner system structure of the servo control valve needle according to claim 1, characterized in that, The chute is provided along the length of the fixed mold.

3. The hot runner system structure of the servo control valve needle according to claim 1, characterized in that, The driving mechanism includes: a worm gear fixed to one end of the screw and coaxial with the screw, and a worm wheel cooperating with the worm gear; the axle of the worm wheel is rotatably connected to the fixed mold, and the outer end of the axle is provided with an internal hexagonal hole.

4. The hot runner system structure of the servo control valve needle according to claim 1, characterized in that, The outer surface of the fixed mold is also provided with a groove for accommodating the worm gear. The groove is connected to the slide groove, and the groove and the slide groove extend in the same direction.

5. The hot runner system structure of the servo control valve needle according to claim 3, characterized in that, The worm gear is rotatably connected to the inner wall of the groove at its end away from the screw via an end bearing.

6. The hot runner system structure of the servo control valve needle according to claim 1, characterized in that, The outer surface of the fixed mold is also provided with a groove for accommodating the worm gear. The groove is located on one side of the rod groove and is connected to the rod groove.

7. The hot runner system structure of the servo control valve needle according to claim 3, characterized in that, The axle of the worm gear is rotatably connected to the bottom wall of the groove via an internal bearing.

8. The hot runner system structure of the servo control valve needle according to claim 3, characterized in that, The axle of the worm gear is perpendicular to the outer surface of the fixed mold.

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