Cost-reduced rotary nozzle cut-off device for injection molding machine

Abstract

A rotary nozzle cut-off device for an injection molding machine with reduced cost comprises a nozzle body, a flow channel is formed in the middle of the nozzle body, a valve element shaft is rotatably arranged in the nozzle body, a through hole is formed in the middle of the valve element shaft, the through hole and the flow channel are arranged on a straight line and are in a communicated state, and a cut-off control mechanism is used for controlling rotation of the valve element shaft. And meanwhile, the closure control mechanism can enable the valve core shaft to return to the initial position, so that the through hole and the flow channel are recovered to be in the communication state, and the closure state is achieved. The cut-off control mechanism comprises a driving air cylinder serving as a driving source, a conversion shaft for converting linear motion of the driving air cylinder into rotary motion, a driving gear fixed at one end of the conversion shaft and a driven gear fixed at one end of the valve core shaft, and the driving gear is meshed with the driven gear, so that the rotary motion of the conversion shaft is transmitted to the valve core shaft; the cut-off control mechanism part of the nozzle cut-off device is improved, and the overall manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to a rotary nozzle intercepting device for an injection molding machine with reduced cost. Background Art

[0002] The rotary nozzle shut-off device for an injection molding machine mentioned in application number 202323166871.4 is the applicant's prior application. Compared with the existing known plunger shut-off nozzle or needle valve shut-off nozzle, the rotary nozzle shut-off device adopts a rotatable valve core shaft, which rotates smoothly with low resistance and is more suitable for high-pressure injection molding equipment. In the scheme mentioned in application number 202323166871.4, the rotation control of the valve core shaft needs to be achieved through the linkage of the first cylinder, the second cylinder, multiple ball bearings and other components. The structure is relatively complex, with more components and high manufacturing costs, and further improvement is needed.

[0003] The applicant further optimized the original application plan and thus came up with this plan. Summary of the invention

[0004] In view of the shortcomings existing in the above problems, the utility model provides a rotary nozzle shutoff device for an injection molding machine with reduced cost.

[0005] To achieve the above object, the utility model provides a cost-reduced rotary nozzle cut-off device for an injection molding machine, comprising:

[0006] A nozzle body, wherein a flow channel is formed in the middle of the nozzle body;

[0007] A valve core shaft, the valve core shaft is rotatably disposed in the nozzle body, a through hole is processed in the middle of the valve core shaft, and the through hole is arranged in a straight line with the flow channel and is in a connected state;

[0008] A flow cut-off control mechanism, the flow cut-off control mechanism is used to control the rotation of the valve core shaft so that the positions of the through hole and the flow channel are offset to achieve a flow cut-off state. At the same time, the flow cut-off control mechanism can return the valve core shaft to an initial position so that the through hole and the flow channel are restored to a connected state;

[0009] The cut-off control mechanism includes a driving cylinder as a driving source, a conversion shaft that converts the linear motion of the driving cylinder into rotational motion, a driving gear fixed at one end of the conversion shaft, and a driven gear fixed at one end of the valve core shaft. The driving gear and the driven gear are in a meshing configuration so that the rotational motion of the conversion shaft is transmitted to the valve core shaft.

[0010] Furthermore, a nozzle head is connected to the lower part of the nozzle body.

[0011] Furthermore, the valve core shaft includes a shaft body and connecting shafts integrally formed on both sides of the shaft body, the through hole is processed on the shaft body, and both connecting shafts form a rotatable structure with the nozzle body through bearing a, and a metal sealing ring is provided between the shaft body and the bearing a.

[0012] Furthermore, a spacer sleeve is provided between the nozzle body and the valve core shaft, the position of the spacer sleeve is fixed relative to the nozzle body, the flow channel passes through the spacer sleeve to form a connection with the through hole, the outer circle of the bearing a is tightly fitted with the inner wall of the spacer sleeve, and hole clamps are provided at both ends of the spacer sleeve, and the hole clamps limit the bearing a.

[0013] Furthermore, a mounting plate is fixed to the upper part of the nozzle body, the driving cylinder is connected to the mounting plate through a cylinder fixing frame, a cylinder body is also fixed to the mounting plate, the conversion shaft is rotatably arranged in the cylinder body through a bearing b, a spiral groove is machined on the conversion shaft, a synchronization shaft is fixed to the piston shaft of the driving cylinder, the synchronization shaft moves synchronously with the piston shaft of the driving cylinder, and one end of the synchronization shaft extends into the spiral groove.

[0014] Furthermore, the cylinder body and the cylinder fixing frame are both processed with long grooves for the linear movement of the synchronization shaft.

[0015] The beneficial effects of the utility model compared to the prior art are as follows: the nozzle cut-off device adopts a rotatable valve core shaft, which rotates smoothly with low resistance and is more suitable for high-pressure injection molding equipment; compared with a rotary nozzle cut-off device for an injection molding machine mentioned in application No. 202323166871.4, the cut-off control mechanism is improved and the overall manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a rotary nozzle shutoff device for an injection molding machine with reduced cost;

[0017] Figure 2 A cross-sectional view of a rotary nozzle shutoff device for an injection molding machine with reduced cost;

[0018] Figure 3 An exploded view of a rotary nozzle shutoff device for an injection molding machine with reduced cost;

[0019] Figure 4 Schematic diagram of the valve core shaft involved.

[0020] In the figure: 1, nozzle head; 2, nozzle body; 21, flow channel; 3, bearing a; 4, metal sealing ring; 5, valve core shaft; 51, through hole; 5a, shaft body; 5b, connecting shaft; 6, spacer; 7, driven gear; 8, driving gear; 9, conversion shaft; 91, spiral groove; 10, mounting plate; 11, bearing b; 12, cylinder; 13, cylinder fixing bracket; 14, synchronization shaft; 15, driving cylinder. DETAILED DESCRIPTION

[0021] like Figures 1 to 4 As shown, a cost-reduced rotary nozzle shutoff device for an injection molding machine according to an embodiment of the utility model comprises a nozzle body 2, a flow channel 21 is formed in the middle of the nozzle body 2; a valve core shaft 5 is rotatably arranged in the nozzle body 2, a through hole 51 is formed in the middle of the valve core shaft 5, and the through hole 51 and the flow channel 21 are arranged in a straight line and are in a connected state; a shutoff control mechanism is used to control the rotation of the valve core shaft 5, so that the positions of the through hole 51 and the flow channel 21 are staggered to reach a shutoff state, and at the same time, the shutoff control mechanism can return the valve core shaft 5 to the initial position, so that the through hole 51 and the flow channel 21 are connected. The shutoff control mechanism includes a driving cylinder 15 as a driving source, a conversion shaft 9 for converting the linear motion of the driving cylinder 15 into a rotational motion, a driving gear 8 fixed at one end of the conversion shaft 9, and a driven gear 7 fixed at one end of the valve core shaft 5. The driving gear 8 and the driven gear 7 are meshed with each other to transmit the rotational motion of the conversion shaft 9 to the valve core shaft 5. The lower part of the nozzle body 2 is connected to the nozzle head 1. The valve core shaft 5 includes a shaft body 5a, a connecting shaft 5b integrally formed on both sides of the shaft body 5a, and a through hole 51 is processed on the shaft body 5a. The connecting shaft 5b forms a rotatable structure with the nozzle body 2 through the bearing a3. A metal sealing ring 4 is provided between the shaft body 5a and the bearing a3 to protect the bearing a3. A spacer 6 is provided between the nozzle body 2 and the valve core shaft 5. The spacer 6 is fixed relative to the nozzle body 2. The flow channel 21 passes through the spacer 6 and is connected with the through hole 51. The outer circle of the bearing a3 is tightly matched with the inner wall of the spacer 6. Hole cards are also provided at both ends of the spacer 6. The hole cards limit the bearing a3. A mounting plate 10 is fixed on the upper part of the nozzle body 2. The driving cylinder 15 is fixed through the cylinder The fixed frame 13 is connected to the mounting plate 10, and a cylinder 12 is also fixed on the mounting plate 10. The conversion shaft 9 is rotatably arranged in the cylinder 12 through the bearing b11. The conversion shaft 9 is processed with a spiral groove 91 (the spiral angle of the spiral groove 91 is 45 degrees to avoid jamming during operation). A synchronous shaft 14 is fixed on the piston shaft of the driving cylinder 15. The synchronous shaft 14 moves synchronously with the piston shaft of the driving cylinder 15, and one end of the synchronous shaft 14 extends into the spiral groove 91; the cylinder 12 and the cylinder fixing frame 13 are both processed with long grooves for the linear movement of the synchronous shaft 14.

[0022] The nozzle shut-off device adopts a rotatable valve core shaft, which rotates smoothly with low resistance and is more suitable for high-pressure injection molding equipment. Compared with a rotary nozzle shut-off device for an injection molding machine mentioned in application number 202323166871.4, the shut-off control mechanism is improved and the overall manufacturing cost is reduced.

[0023] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0024] Combination Figure 2 , Figure 3 At this time, the cut-off control mechanism is in a connected state, the driving cylinder 15 is in a high position, that is, the synchronous shaft 14 is located at a high position of the spiral groove 91, and it is necessary to switch to the cut-off state, the driving cylinder 15 moves downward, and the synchronous shaft 14 moves downward synchronously. At the same time, one end of the synchronous shaft 14 rotates along the spiral groove 91 to make the conversion shaft 9 rotate, and the conversion shaft 9 is transmitted to the valve core shaft 5 through the driving gear 8 and the driven gear 7. The valve core shaft 5 rotates to make the position of the through hole 51 and the flow channel 21 staggered, reaching the cut-off state; when the driving cylinder 15 returns to a high position, the device switches to the connected state again.

[0025] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cost-reduced rotary nozzle shutoff device for an injection molding machine, characterized in that: include A nozzle body (2), wherein a flow channel (21) is formed in the middle of the nozzle body (2); A valve core shaft (5), the valve core shaft (5) being rotatably arranged in the nozzle body (2), a through hole (51) being machined in the middle of the valve core shaft (5), the through hole (51) being arranged in a straight line with the flow channel (21) and being in a connected state; a flow cut-off control mechanism, the flow cut-off control mechanism being used to control the rotation of the valve core shaft (5) so that the positions of the through hole (51) and the flow channel (21) are offset to achieve a flow cut-off state; at the same time, the flow cut-off control mechanism can return the valve core shaft (5) to an initial position so that the through hole (51) and the flow channel (21) are restored to a connected state; The cut-off control mechanism comprises a driving cylinder (15) as a driving source, a conversion shaft (9) for converting the linear motion of the driving cylinder (15) into rotational motion, a driving gear (8) fixed to one end of the conversion shaft (9), and a driven gear (7) fixed to one end of the valve core shaft (5), wherein the driving gear (8) and the driven gear (7) are in meshing configuration so that the rotational motion of the conversion shaft (9) is transmitted to the valve core shaft (5).

2. A rotary nozzle cut-off device for an injection molding machine according to claim 1, characterized in that: The lower part of the nozzle body (2) is connected to a nozzle head (1).

3. The rotary nozzle cut-off device for an injection molding machine according to claim 1, characterized in that: The valve core shaft (5) comprises a shaft body (5a) and connecting shafts (5b) integrally formed on both sides of the shaft body (5a); the through hole (51) is machined on the shaft body (5a); the two connecting shafts (5b) are connected to the nozzle body (2) via a bearing a (3) to form a rotatable structure; a metal sealing ring (4) is provided between the shaft body (5a) and the bearing a (3).

4. A rotary nozzle cut-off device for an injection molding machine according to claim 3, characterized in that: A spacer sleeve (6) is provided between the nozzle body (2) and the valve core shaft (5); the position of the spacer sleeve (6) relative to the nozzle body (2) is fixed; the flow channel (21) passes through the spacer sleeve (6) and is connected to the through hole (51); the outer circle of the bearing a (3) is tightly fitted with the inner wall of the spacer sleeve (6); and hole clamps are provided at both ends of the spacer sleeve (6); the hole clamps limit the bearing a (3).

5. The rotary nozzle cut-off device for an injection molding machine according to claim 1, characterized in that: A mounting plate (10) is fixed to the upper part of the nozzle body (2); the driving cylinder (15) is connected to the mounting plate (10) via a cylinder fixing frame (13); a cylinder body (12) is also fixed to the mounting plate (10); the conversion shaft (9) is rotatably arranged in the cylinder body (12) via a bearing b (11); a spiral groove (91) is machined on the conversion shaft (9); a synchronous shaft (14) is fixed to the piston shaft of the driving cylinder (15); the synchronous shaft (14) moves synchronously with the piston shaft of the driving cylinder (15); one end of the synchronous shaft (14) extends into the spiral groove (91).

6. A rotary nozzle cut-off device for an injection molding machine according to claim 5, characterized in that: The cylinder body (12) and the cylinder fixing frame (13) are both machined with long grooves for the linear movement of the synchronization shaft (14).

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