Valve type hot runner structure of mold

Abstract

The utility model provides a valve type hot runner structure of a mold, and belongs to the technical field of molds. The problem that an existing mold is unstable when driving a valve needle to move is solved. According to the valve type hot runner structure of the mold, the mold comprises a fixed mold, a hot runner is formed in the fixed mold, a valve needle is arranged in the hot runner in a penetrating mode, the valve type hot runner structure comprises a cylinder body fixed to the fixed mold and a sliding plug arranged in the cylinder body, a buffering hole is formed in the sliding plug, and the top end of the valve needle is inserted into the buffering hole of the sliding plug in a sliding mode. The top end of the sliding plug is in threaded connection with an adjusting bolt, a buffer spring located between the adjusting bolt and the top end of the valve needle is arranged in the sliding plug, and the sliding plug can do reciprocating linear movement in the cylinder body in the axial direction of the valve needle. The valve type hot runner structure of the mold is more compact, and the moving stability of the valve needle is also improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a valve hot runner structure of mould. BACKGROUND

[0002] In the field of injection mould, hot runner technology has been widely quoted, hot runner technology not only can reduce the waste of plastic material, can also shorten the forming cycle and promote production efficiency, after the product is filled every time, the valve needle will seal the gate, improve the qualified rate of product.

[0003] The advantage of the gate of this mould is that the product has no material head, so the gate is directly placed on the appearance surface of the product, once the valve needle is closed, only a ring-shaped mark is seen around the gate, and the diameter of the ring-shaped mark is the same as the diameter of the gate. For example, Chinese patent application

authorized publication number: CN206568477U

[0004] The above structure moves the valve needle plate through the power unit, and the valve needle plate drives the plurality of valve needles to make reciprocating linear motion along the axial direction of the valve needle, so that the driving force of the power unit is large when driving the valve needle plate to move. The valve needle plate needs to drive the plurality of valve needles to move when moving, which leads to unstable movement of the valve needle, affects the cooperation of the valve needle and the mould, and easily leads to the situation that the gate appears flash. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a valve hot runner structure of mould. The technical problem to be solved by the utility model is how to stabilize the movement of the valve needle driven by the existing mould.

[0006] The purpose of the utility model can be achieved by the following technical schemes:

[0007] A valve hot runner structure of mould, the mould comprises a fixed mould, a hot runner is formed in the fixed mould, a valve needle is arranged in the hot runner, and the valve hot runner structure comprises a cylinder body fixed on the fixed mould and a sliding plug arranged in the cylinder body. A buffer hole is formed in the sliding plug, the top end of the valve needle is slidably inserted into the buffer hole of the sliding plug, an adjusting bolt is threadedly connected to the top end of the sliding plug, a buffer spring is arranged between the adjusting bolt and the top end of the valve needle in the sliding plug, and the sliding plug can make reciprocating linear movement in the cylinder body along the axial direction of the valve needle.

[0008] Working principle: by the valve needle is provided in the hot runner of the fixed mold, fixed on the fixed mold cylinder, provided with a slide in the cylinder, the slide is provided with a buffer hole, the top end of the valve needle is inserted into the buffer hole of the slide, after clamping, the molten material enters into the forming cavity through the hot runner, at this time the valve needle does not plug the gate, when the molten material in the forming cavity is enough, the slide can reciprocating linearly move in the cylinder along the axial direction of the valve needle, the movement of the slide drives the valve needle to move, the valve needle moves linearly towards the forming cavity, the buffer spring is provided between the adjusting bolt in the slide and the top of the valve needle, which buffers the impact and reduces the impact force, avoiding the cracking failure of the gate under the action of fatigue stress, through the linear motion of the slide in the cylinder, the valve needle moves, the slide moves along the inner cavity wall of the cylinder, which has a guiding effect on the movement of the slide, improves the stability of the slide movement, and improves the stability of the valve needle movement, so that the valve needle can stably block the gate, and the stability of the valve needle movement is improved.

[0009] More importantly, the application is directly provided with a buffer hole on the slide in the cylinder, and the valve needle replaces the existing piston rod, which is inserted into the cylinder, and the top end of the piston rod is inserted into the buffer hole of the slide. The buffer spring is also integrated into the cylinder. Compared with the existing elastic element directly provided on the outside of the driving element, the structure is more compact and the stability is higher.

[0010] In the valve type hot runner structure of the mold, the fixed mold is connected with a fixed mold panel, the fixed mold panel is provided with an adjusting hole, and the adjusting hole and the adjusting bolt are arranged in the axial direction of the valve needle.

[0011] After long-term use, the valve needle produces a certain impact on the gate each time, the buffer spring reduces the impact of the valve needle on the gate, and when the valve needle and the mold gate need to be adjusted, the tool pliers or the like can be inserted into the accommodation cavity from the adjusting hole and the adjusting bolt can be removed, so that the adjustment of the valve needle can be realized. The taper of the tail of the valve needle is matched and adjusted with the taper of the mold gate, so that the adjustment of the valve needle is more convenient. The compression degree of the buffer spring can be adjusted by rotating the adjusting bolt, so that the buffer spring can always play a good damping effect during long-term use, which is convenient for maintenance of the valve needle, greatly improves the work efficiency and maintenance efficiency, and ensures the yield of the mold after long-term use.

[0012] In the valve type hot runner structure of the mold, the top of the valve needle has a limiting shoulder, the slide has a limiting flange in the form of a ring, one end of the limiting shoulder abuts against one end of the limiting flange in the axial direction of the valve needle, and the outer side wall of the limiting shoulder has a limiting wall in the form of a plane, which can be close to or fit with the inner side wall of the slide.

[0013] The top of the valve needle is positioned quickly with the slide block by setting the limiting shoulder on the limiting ridge, and the cooperation between the limiting wall and the inner wall of the slide plug prevents the valve needle from rotating circumferentially during the buffering process, so that the valve needle only moves linearly along its axial direction, ensuring that the valve needle can stably block the sprue, and improving the precision of the mold.

[0014] In the valve hot runner structure of the mold, the inner wall of the slide plug is inwardly protruded to form a blocking part, the blocking part is arranged corresponding to the limiting wall, and the blocking part is close to or in contact with the corresponding limiting wall.

[0015] The cooperation between the blocking part and the limiting wall prevents the top of the valve needle from rotating circumferentially by the cooperation of the limiting wall of the limiting shoulder, so as to improve the precision of the mold.

[0016] In the valve hot runner structure of the mold, the middle part of the outer wall of the slide plug is protruded circumferentially to form a sliding ring, and two air vents are formed on the cylinder body, and the two air vents are located at the two ends of the sliding ring along the axial direction of the valve needle.

[0017] When driving the linear motion of the valve needle, gas is introduced from the air vent close to the top end of the cylinder body to push the sliding ring of the slide plug to move along the cylinder body, and the slide plug drives the valve needle to move linearly along the axial direction synchronously to realize the closing of the sprue by the valve needle, when it is needed to open the sprue, the gas is directly introduced into the other air vent to push the sliding ring of the slide plug to move reversely, and the setting of the sliding ring makes it more convenient and stable to drive the slide plug to move.

[0018] In the valve hot runner structure of the mold, the limiting wall is provided with two limiting walls, and the two limiting walls are connected by two arc-shaped mounting walls, and the two limiting walls are symmetrically arranged along the axial direction of the valve needle.

[0019] The setting of the two limiting walls requires less processing of the top of the original valve needle, and more upper top surface of the valve needle is reserved for the abutting of the buffer spring, and the cooperation between the mounting wall and the limiting wall makes the inner wall of the slide plug close to the limiting wall, and the top of the valve needle is more stable.

[0020] In the valve hot runner structure of the mold, the valve needle is arranged obliquely, and the side wall of the fixed mold panel is provided with the adjusting hole, and the adjusting hole is arranged obliquely and has the same oblique angle as the valve needle.

[0021] The opening is formed on the side wall of the fixed mold panel, and the installation of the fixed mold panel is not affected by the opening on the end of the fixed mold panel during the production process of the mold, and the installation of the fixed mold panel is not affected by the opening on the side wall, and the adjustment of the valve needle is also convenient.

[0022] The top of the sliding plug is provided with a counterbore, and the head of the adjusting bolt is arranged in the counterbore.

[0023] The counterbore is arranged to make the adjusting bolt more stable, and when the overall compression of the buffer spring needs to be adjusted, the adjusting bolt is limited to avoid being excessively embedded in the sliding plug when rotating, so that the adjustment is more convenient and stable.

[0024] In the valve hot runner structure of the mold, the top end of the sliding plug is located outside the cylinder body, and a sealing ring is arranged between the outer side wall of the top end of the sliding plug and the inner side wall of the cylinder body.

[0025] The sealing ring is arranged to avoid gas overflow of the cylinder body and ensure the stability of the cylinder drive.

[0026] Compared with the prior art, the sliding plug moves linearly in the cylinder body to drive the valve needle to move, the sliding plug moves along the inner cavity wall of the cylinder body during movement, the movement of the sliding plug is guided, the stability of the sliding plug movement is improved, and the stability of the valve needle movement is improved, so that the valve needle can stably block the sprue, and the stability of the valve needle movement is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional view of the utility model after assembly at the valve needle.

[0028] Figure 2 is Figure 1 is a local enlarged view of A in the figure.

[0029] Figure 3 is a structure schematic view of the sliding plug in the utility model.

[0030] Figure 4 is a partial structure schematic view of the valve needle in the utility model.

[0031] In the figure, 1, fixed mold; 11, fixed mold frame; 12, fixed mold insert; 12a, cooling water jacket; 2, fixed mold panel; 21, adjusting hole; 3, valve needle; 31, limiting shoulder; 31a, limiting wall; 31b, mounting wall; 4, driving part; 41, cylinder body; 41a, piston cavity; 41b, air vent; 6, sliding plug; 61, adjusting bolt; 62, limiting edge; 63, blocking part; 64, counterbore; 65, sliding ring; 66, buffer hole; 7, buffer spring; 8, sealing ring; 9, hot runner. DETAILED DESCRIPTION

[0032] The utility model discloses the specific embodiment of the utility model is as follows, and the technical scheme of the utility model is further described in connection with the drawings, but the utility model is not limited to these embodiments.

[0033] As Figure 1 The valve hot runner structure of the mold includes a fixed mold 1, and a hot runner 9 is formed on the fixed mold 1, and a valve needle 3 is arranged in the hot runner 9.

[0034] Specifically, as Figures 1-4 The valve hot runner structure includes a cylinder body 41 fixed on the fixed mold 1 and a sliding plug 6 arranged in the cylinder body 41, the sliding plug 6 is provided with a buffer hole 66, the top end of the valve needle 3 is slidably inserted into the buffer hole 66 of the sliding plug 6, the top end of the sliding plug 6 is threadedly connected with an adjusting bolt 61, the sliding plug 6 is provided with a buffer spring 7 between the adjusting bolt 61 and the top end of the valve needle 3, and the sliding plug 6 can reciprocatingly and linearly move in the cylinder body 41 along the axial direction of the valve needle 3.

[0035] Working principle: the valve needle 3 is arranged in the hot runner 9 of the fixed mold 1, the cylinder body 41 is fixed on the fixed mold 1, the sliding plug 6 is arranged in the cylinder body 41, the sliding plug 6 is provided with the buffer hole 66, the top end of the valve needle 3 is slidably inserted into the buffer hole 66 of the sliding plug 6, after the mold is closed, the molten raw material enters the molding cavity through the hot runner 9, at this time, the valve needle 3 does not block the gate, when the molten raw material in the molding cavity is sufficient, the sliding plug 6 can reciprocatingly and linearly move in the cylinder body 41 along the axial direction of the valve needle 3, the movement of the sliding plug 6 drives the movement of the valve needle 3, the valve needle 3 linearly moves towards the molding cavity, the buffer spring 7 is arranged between the adjusting bolt 61 in the sliding plug 6 and the top of the valve needle 3, so as to buffer the impact and reduce the impact force, thereby avoiding the cracking failure of the gate under the action of fatigue stress, through the linear movement of the sliding plug 6 in the cylinder body 41, the valve needle 3 of the sliding plug 6 is driven to move, the sliding plug 6 moves along the inner cavity wall of the cylinder body 41, which has a guiding effect on the movement of the sliding plug 6 and improves the stability of the movement of the sliding plug 6 and the valve needle 3, so that the valve needle 3 can stably block the gate and improve the stability of the movement of the valve needle 3.

[0036] As Figures 2-4As shown, the fixed mold 1 is connected with a fixed mold panel 2, the fixed mold panel 2 is provided with an adjusting hole 21, the adjusting hole 21 is arranged along the axial direction of the valve needle 3, the top of the valve needle 3 is provided with a limiting shoulder 31, the sliding plug 6 is provided with a limiting flange 62 in the form of a ring, one end of the limiting shoulder 31 abuts against one end of the limiting flange 62 along the axial direction of the valve needle 3, the outer side wall of the limiting shoulder 31 is provided with a limiting wall 31a in the form of a plane, the limiting wall 31a can be close to or abut against the inner side wall of the sliding plug 6, the inner side wall of the sliding plug 6 is inwardly protruded to form a blocking part 63, the blocking part 63 is arranged corresponding to the limiting wall 31a, and the blocking part 63 is close to or abut against the corresponding limiting wall 31a, the limiting wall 31a is provided with two, the two limiting walls 31a are connected through two mounting walls 31b in the form of an arc, and the two limiting walls 31a are symmetrically arranged along the axial direction of the valve needle 3.

[0037] As shown in Figure 1 and Figure 2 , the valve needle 3 is arranged obliquely, the side wall of the fixed mold panel 2 is provided with the adjusting hole 21, the adjusting hole 21 is arranged obliquely and the oblique angle is the same as the oblique angle of the valve needle 3, the top of the sliding plug 6 is provided with a counterbore 64, the head of the adjusting bolt 61 is arranged in the counterbore 64, and the buffer spring 7 is arranged between the upper end face of the valve needle 3 and the rod part of the adjusting bolt 61.

[0038] As shown in Figure 2 , the mold further comprises a driving member 4, the driving member 4 comprises the above-mentioned cylinder body, the cylinder body 41 is provided with a piston cavity 41a for the sliding plug 6 to move up and down, the middle part of the outer side wall of the sliding plug 6 is protruded to form a sliding ring 65 along the circumference, the cylinder body 41 is provided with two air vents 41b, the two air vents 41b are respectively located at the two ends of the sliding ring 65 along the axial direction of the valve needle 3, the end part of the top end of the sliding plug 6 is located outside the cylinder body 41, and the outer side wall of the top end of the sliding plug 6 and the inner side wall of the cylinder body 41 are provided with a sealing ring 8.

[0039] As shown in Figure 1 , the fixed mold 1 comprises a fixed mold frame 11 and a fixed mold insert 12 fixedly connected with the fixed mold frame 11, the fixed mold insert 12 is provided with a cooling water jacket 12a, the cooling water jacket 12a is sleeved on the valve needle 3, and the cooling water jacket 12a is located outside the bottom of the valve needle 3.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A valve hot runner structure of a mold, the mold comprising a fixed mold (1) having a hot runner (9) formed therein, and a valve pin (3) penetrating the hot runner (9), characterized in that, The valve hot runner structure comprises a cylinder (41) fixed on a fixed mold (1) and a sliding plug (6) arranged in the cylinder (41), the sliding plug (6) is provided with a buffer hole (66), the top end of the valve needle (3) is slidably inserted into the buffer hole (66) of the sliding plug (6), the top end of the sliding plug (6) is threadedly connected with an adjusting bolt (61), the sliding plug (6) is provided with a buffer spring (7) between the adjusting bolt (61) and the top end of the valve needle (3), and the sliding plug (6) can reciprocate linearly in the cylinder (41) along the axial direction of the valve needle (3).

2. The valve hot runner structure of a mold according to claim 1, wherein The fixed mold (1) is connected with a fixed mold panel (2), the fixed mold panel (2) is provided with an adjusting hole (21), and the adjusting hole (21) is arranged opposite to the adjusting bolt (61) along the axial direction of the valve needle (3).

3. The valve hot runner structure of a mold according to claim 1 or 2, characterized by, The top of the valve needle (3) is provided with a limiting shoulder (31), the sliding plug (6) is provided with a limiting flange (62) in the shape of a ring, one end of the limiting shoulder (31) is abutted against one end of the limiting flange (62) along the axial direction of the valve needle (3), and the outer side wall of the limiting shoulder (31) is provided with a limiting wall (31a) in the shape of a plane, which can be close to or abut against the inner side wall of the sliding plug (6).

4. The valve hot runner structure of a mold according to claim 3, wherein The inner side wall of the sliding plug (6) is inwardly protruded to form a blocking part (63), the blocking part (63) is arranged opposite to the limiting wall (31a), and the blocking part (63) is close to or abut against the corresponding limiting wall (31a).

5. The valve hot runner structure of a mold according to claim 1 or 2, characterized by, The middle part of the outer side wall of the sliding plug (6) is outwardly protruded to form a sliding ring (65), the cylinder (41) is provided with two air vents (41b), and the two air vents (41b) are respectively located at the two ends of the sliding ring (65) along the axial direction of the valve needle (3).

6. The valve hot runner structure of a mold according to claim 3, wherein The limiting wall (31a) is provided with two, the two limiting walls (31a) are connected through two arc-shaped mounting walls (31b), and the two limiting walls (31a) are symmetrically arranged along the axial direction of the valve needle (3).

7. The valve hot runner structure of a mold according to claim 2, wherein The valve needle (3) is arranged obliquely, the side wall of the fixed mold panel (2) is provided with the above-mentioned adjusting hole (21), and the adjusting hole (21) is arranged obliquely and has the same oblique angle as the valve needle (3).

8. The valve hot runner structure of a mold according to claim 1 or 2, characterized by, The top of the sliding plug (6) is provided with a counterbore (64), the head of the adjusting bolt (61) is arranged in the counterbore (64), and the buffer spring (7) is arranged between the end face of the valve needle (3) and the rod part of the adjusting bolt (61).

9. The valve hot runner structure of a mold according to claim 7, wherein The top end of the sliding plug (6) is located outside the cylinder (41), and a sealing ring (8) is arranged between the outer side wall of the top end of the sliding plug (6) and the inner side wall of the cylinder (41).

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