Hot runner needle valve type glue sealing mechanism and hot runner system

Abstract

The utility model provides a hot runner needle valve type glue sealing mechanism and a hot runner system, and the hot runner needle valve type glue sealing mechanism comprises a motor, a transmission mechanism and a valve needle, the motor is connected with the valve needle through a transmission mechanism to drive the valve needle to move to a first position or a second position along the center line of the valve needle so as to open or close the glue outlet; the transmission mechanism comprises a transmission part, a spiral groove is formed in the transmission part, a push block inserted into the spiral groove is arranged on the valve needle, the transmission mechanism is connected with an output shaft of the motor through the transmission part, and the transmission part is used for pushing the push block to move along the track limited by the limiting structure through the groove wall of the spiral groove when driven by the motor to rotate. And the push block drives the valve needle to move to a first position or a second position along the center line of the valve needle. The motor is used for replacing an air cylinder, the rotating speed of the motor is controllable, for example, the rotating speed can be controlled through a PLC control panel, the opening and closing speed of the valve needle can be effectively controlled, sudden impact like the air cylinder is avoided, and abrasion of the glue outlet is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot runner, and particularly relates to a hot runner needle valve type glue sealing mechanism and a hot runner system. Background Art

[0002] There are two types of runners in injection molds, namely cold runners and hot runners. A cold runner is just a channel without any auxiliary accessories, so its structure is relatively simple. A hot runner has a short forming cycle, can increase production, and has a flat and beautiful gate, no sprue material, and small loss. However, the structure of a hot runner is relatively complex and requires many auxiliary workpieces to complete. Among them, there are two ways for the glue outlet of the hot runner: one is an open type; the other is a needle valve type. The open type glue outlet is prone to glue leakage and blockage, so the needle valve type glue outlet is commonly used now. The needle valve type drives the valve needle to reciprocate through the piston of the cylinder, so that the glue outlet is opened or closed, thereby achieving a perfect effect of injection and glue sealing. The existing needle valve type glue outlet has at least the following deficiencies:

[0003] 1. Using a cylinder as the power for the reciprocation of the valve needle cannot effectively control the opening and closing speed of the valve needle, resulting in easy wear of the glue outlet;

[0004] 2. When there are multiple groups of valve needles, the movement of the valve needles cannot be controlled in a sequential order according to needs;

[0005] 3. After long-term reciprocating movement under high temperature and high pressure, the wear between the valve needle and the glue sealing valve sleeve is serious, and it is easy to leak glue, resulting in the valve needle being stuck. Content of the Utility Model

[0006] Therefore, the utility model provides a hot runner needle valve type glue sealing mechanism and a hot runner system, which can solve the technical problem that in the prior art, using a cylinder as the power for the reciprocation of the valve needle cannot effectively control the opening and closing speed of the valve needle, resulting in easy wear of the glue outlet.

[0007] To solve the above problems, the utility model provides a hot runner needle valve type glue sealing mechanism, which includes a motor, a transmission mechanism and a valve needle; the motor is connected to the valve needle through the transmission mechanism to drive the valve needle to move along its own center line to a first position or a second position, and the valve needle is used to open the glue outlet when moving to the first position and close the glue outlet when moving to the second position;

[0008] Wherein, the transmission mechanism includes a transmission part, a spiral groove is arranged on the transmission part, a push block inserted into the spiral groove is arranged on the valve needle, the transmission mechanism is connected to the output shaft of the motor through the transmission part, and the transmission part is used to drive the push block to move along the track defined by the limiting structure through the groove wall of the spiral groove when rotating under the drive of the motor, so that the push block drives the valve needle to move along its own center line to the first position or the second position.

[0009] In some embodiments, one end of the transmission member is provided with a guiding hole, the spiral groove is arranged on the inner wall of the guiding hole, the pushing block is located on the side wall of the valve needle, the valve needle is inserted into the guiding hole and is in sliding fit with the guiding hole.

[0010] In some embodiments, the hot runner needle valve sealing mechanism includes a fixing member, the limiting structure includes a limiting groove arranged on the fixing member, the limiting groove extends along the central axis direction of the valve needle, the pushing block is inserted into the limiting groove and can move along the limiting groove; wherein, the trajectory defined by the limiting structure is the extending trajectory of the limiting groove.

[0011] In some embodiments, the number of the limiting grooves is more than two, and the number of the pushing blocks is equal to and corresponds to the number of the limiting grooves one by one.

[0012] In some embodiments, when one end of the transmission member is provided with a guiding hole and the spiral groove is arranged on the inner wall of the guiding hole, the spiral groove penetrates through the outer wall of the transmission member, the fixing member is sleeved outside the transmission member, and the pushing block penetrates through the outer wall of the transmission member.

[0013] In some embodiments, the hot runner needle valve sealing mechanism further includes a sealing valve sleeve, the sealing valve sleeve is a fixed component, the sealing valve sleeve is provided with a penetrating sleeve hole, the sealing valve sleeve is sleeved on the sealing section of the transmission member through the sleeve hole, and the sleeve hole and the sealing section are in rotational fit through a conical table surface;

[0014] Wherein, the conical table surface on the sleeve hole forms a conical hole section, and the large-mouth end of the two ends of the conical hole section is closer to the glue outlet.

[0015] In some embodiments, the motor is a stepping motor.

[0016] The present invention also provides a hot runner system, which includes the hot runner needle valve sealing mechanism described in any one of the above; the number of the glue outlets is more than two, and the number of the hot runner needle valve sealing mechanisms is equal to and corresponds to the number of the glue outlets one by one;

[0017] Wherein, the hot runner system further includes a control board, and the control board is used to control the motors of the hot runner needle valve sealing mechanisms, so that the valve needles do not close the corresponding glue outlets simultaneously.

[0018] The hot runner needle valve sealing mechanism and the hot runner system provided by the present invention have the following beneficial effects:

[0019] 1. Replace the cylinder with a motor. The rotation speed of the motor is controllable. For example, it can be controlled by a PLC control board, which can effectively control the opening and closing speed of the valve needle. It will not suddenly impact like a cylinder, which is beneficial to reducing the wear of the glue outlet.

[0020] 2. The sequence can be set according to needs. For the hot runner with multiple groups of needle valves, the sequence of the valve needles avoids problems such as air entrapment, shrinkage, and deformation of the product, improves the appearance of the product, and also plays an auxiliary role in the glue flow balance of the runner, thereby simplifying the runner processing technology and saving processing costs.

[0021] 3. Change the up and down movement of the valve needle above the glue-sealing valve sleeve, which reduces a concentric point with the glue outlet, makes the valve needle more flexible, and uses a spiral method to move the valve needle, thus separating the up and down movement and the rotational movement.

[0022] 4. The glue sealing of the glue-sealing valve sleeve was originally cylindrical glue sealing and required up and down movement. In this case, if it is too tight, it will jam the valve needle; if it is too loose, it will leak glue, and the wear is large. The concentricity with the glue outlet needs to be very accurate, otherwise the wear is large and the number of repair times is many. After the modification and rotation, the glue is sealed with a conical table surface. The glue-sealing valve sleeve is not concentric with the glue outlet. Even if there is wear on the conical table surface, it will become more and more tightly sealed and will not leak glue instead. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0024] Figure 1 is a schematic structural diagram of the hot runner needle valve type glue-sealing mechanism of the present invention;

[0025] Figure 2 is a partial exploded schematic diagram of the hot runner needle valve type glue-sealing mechanism of the present invention;

[0026] Figure 3 is an assembly schematic diagram of the glue-sealing section of the glue-sealing valve sleeve and the valve needle;

[0027] Figure 4 is a partial structural schematic diagram of the hot runner system.

[0028] The reference numerals are as follows:

[0029] 1. Motor; 2. Transmission part; 3. Valve needle; 4. Fixing part; 5. Glue-sealing valve sleeve; 21. Spiral groove; 31. Pusher block; 41. Limit groove; 51. Conical hole section; 201. Guide hole; 100. Hot runner needle valve type glue-sealing mechanism; 101. Glue outlet. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing the specific implementation mode and are not intended to limit the exemplary implementation mode according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0032] It should be understood that the term " / and" used herein is only a relational expression describing the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0033] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the structures, ratios, sizes, etc. shown in the accompanying drawings are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. Technologies, methods and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but in appropriate cases, the technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as only exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0035] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation other than the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0036] In addition, it should be noted that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0037] Referring jointly to Figure 1 and Figure 2 As shown, according to an embodiment of the present utility model, a hot runner needle valve type glue sealing mechanism 100 is provided, which includes a motor 1, a transmission mechanism and a valve needle 3. The motor 1 is connected to the valve needle 3 through the transmission mechanism to drive the valve needle 3 to move along its own central axis to a first position or a second position. The valve needle 3 is used to open the glue outlet 101 when moving to the first position and close the glue outlet 101 when moving to the second position.

[0038] Among them, the transmission mechanism includes a transmission member 2, on which a spiral groove 21 is provided, and a push block 31 inserted into the spiral groove 21 is provided on the valve needle 3. The transmission mechanism is connected to the output shaft of the motor 1 through the transmission member 2. When the transmission member 2 is driven by the motor 1 to rotate, the push block 31 is pushed by the groove wall of the spiral groove 21 to move along the trajectory defined by the limiting structure, so that the push block 31 drives the valve needle 3 to move along its own center line to the first position or the second position.

[0039] In the above example, the transmission member 2 is preferably a transmission shaft, and the center lines of the transmission shaft, the spiral groove 21, and the valve needle 3 coincide. The spiral groove 21 cooperates with the limiting structure. When the transmission member 2 rotates, the push block 31 can be pushed to move along the trajectory defined by the limiting structure, and the defined trajectory can extend along the direction of the center line of the valve needle 3, so that the push block 31 drives the valve needle 3 to move to the first position or the second position.

[0040] Among them, since the valve needle 3 is driven by the motor 1, the purpose of controlling the opening and closing speed of the glue outlet 101 of the valve needle 3 can be achieved by adjusting the rotation speed of the motor 1.

[0041] In a specific application example, the above-mentioned motor 1 can be a stepping motor, and the operating speed of the motor 1 can be controlled by a control board such as a PLC control board. In this way, the opening and closing speed of the valve needle 3 can be effectively controlled, and there will be no sudden impact like a cylinder, which is beneficial to reducing the wear of the glue outlet 101.

[0042] In some embodiments, as Figure 3 shown, one end of the aforementioned transmission member 2 can be provided with a guide hole 201, and the aforementioned spiral groove 21 is provided on the hole wall of the guide hole 201. The aforementioned push block 31 is located on the side wall of the valve needle 3, and the push block 31 is preferably fixedly connected to the valve needle 3. The valve needle 3 is inserted into the guide hole 201 and is slidably matched with the guide hole 201.

[0043] In the above example, by providing the guide hole 201, it is beneficial to guide the movement of the valve needle 3 and can improve the movement accuracy of the valve needle 3.

[0044] As Figure 1 and Figure 2 shown, the aforementioned hot runner needle valve sealing mechanism 100 may further include a fixing member 4, and the aforementioned limiting structure includes a limiting groove 41 provided on the fixing member 4, and the limiting groove 41 extends along the center line direction of the valve needle 3. The push block 31 is inserted into the limiting groove 41 and can move along the limiting groove 41. Among them, the trajectory defined by the limiting structure is the extension trajectory of the limiting groove 41.

[0045] In the above example, when the transmission member 2 rotates, it pushes the push block 31 through the groove wall of the spiral groove 21, and the limiting structure limits the push block 31 through the limiting groove 41, so that the push block 31 moves along the limiting groove 41. Among them, the cooperation between the spiral groove 21 and the limiting groove 41 can convert the rotational motion of the transmission member 2 into the linear motion of the push block 31.

[0046] In some embodiments, the number of the foregoing limiting grooves 41 may be more than two, and the number of the push blocks 31 is equal to the number of the limiting grooves 41 and corresponds to each other one by one.

[0047] In the above example, by setting a larger number of push blocks 31, the stability of the push block 31 driving the valve needle 3 to move can be improved.

[0048] As Figure 1 shown, when a guiding hole 201 is provided at one end of the transmission member 2 and the spiral groove 21 is provided on the hole wall of the guiding hole 201, the foregoing spiral groove 21 penetrates through the outer wall of the transmission member 2, the fixing member 4 is sleeved on the outside of the transmission member 2, and the push block 31 penetrates through the outer wall of the transmission member 2.

[0049] In the above example, by sleeving the fixing member 4 on the outside of the transmission member 2, the fixing member 4 can provide housing protection for the transmission member 2.

[0050] As Figure 3 shown, the foregoing hot runner needle valve type glue sealing mechanism 100 may further include a glue sealing valve sleeve 5, and the glue sealing valve sleeve 5 is a fixing component. A penetrating sleeve hole is provided on the glue sealing valve sleeve 5, and the glue sealing valve sleeve 5 is sleeved on the glue sealing section of the transmission member 2 through the sleeve hole. The sleeve hole and the glue sealing section are rotationally matched through conical table surfaces, that is, conical table surfaces are provided on both the sleeve hole and the glue sealing section.

[0051] Among them, the conical table surface on the sleeve hole forms a conical hole section 51, and the large-mouth end of the two ends of the conical hole section 51 is closer to the glue outlet 101.

[0052] In the above example, since the sleeve hole and the glue sealing section are rotationally matched through conical table surfaces, it is easier to assemble the valve needle 3 and the glue sealing valve sleeve 5. Among them, the up-and-down movement of the valve needle 3 is changed to above the glue sealing valve sleeve 5, so that a concentric point with the glue outlet 101 is reduced, making the valve needle 3 more flexible, and the valve needle 3 moves in a spiral manner, thus separating the up-and-down movement and the rotational movement. In addition, for the glue sealing of the glue sealing valve sleeve 5, the original cylindrical glue sealing requires up-and-down movement. If it is too tight, it will jam the valve needle 3; if it is too loose, it will leak glue, and the wear is large. The concentricity with the glue outlet 101 needs to be very accurate, otherwise the wear is large and the number of repair times is many. After the modification to rotation, the glue is sealed with a conical table surface. The glue sealing valve sleeve 5 is not concentric with the glue outlet 101. Even if there is wear on the conical table surface, it will become more and more tightly fitted and will not leak glue instead.

[0053] As Figure 4As shown in the figure, the present utility model further provides a hot runner system, which includes the aforementioned hot runner needle valve glue-sealing mechanism 100. The number of the aforementioned glue outlets 101 is more than two, and the number of the hot runner needle valve glue-sealing mechanisms 100 is equal to and corresponds one-to-one with the number of the glue outlets 101. Among them, the hot runner system further includes a control board, and the control board is used to control the motors 1 of the respective hot runner needle valve glue-sealing mechanisms 100 so that the respective valve needles 3 do not close the corresponding glue outlets 101 simultaneously.

[0054] It should be noted here that: the above control board can be a PLC control board.

[0055] In the above example, the sequence can be set according to needs. For the hot runner with multiple groups of needle valves, the sequence of the valve needles 3 avoids problems such as air entrapment, shrinkage, and deformation of the product, improves the appearance of the product, and at the same time also plays an auxiliary role in the glue flow balance of the runner, thereby simplifying the runner processing technology and saving processing costs.

[0056] Among them, the technical solution of this utility model is beneficial to improving the use of the hot runner, adding various functions, preventing glue leakage, facilitating maintenance, and reducing the occurrence of problems.

[0057] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0058] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A hot runner needle valve type sealing mechanism (100), characterized in that: The invention comprises a motor (1), a transmission mechanism and a valve needle (3); the motor (1) is connected to the valve needle (3) via the transmission mechanism to drive the valve needle (3) to move along its center line to a first position or a second position, and the valve needle (3) is used to open a glue outlet (101) when it moves to the first position, and to close the glue outlet (101) when it moves to the second position; The transmission mechanism comprises a transmission member (2), the transmission member (2) is provided with a spiral groove (21), the valve needle (3) is provided with a push block (31) inserted into the spiral groove (21), the transmission mechanism is connected to the output shaft of the motor (1) through the transmission member (2), and the transmission member (2) is used to push the push block (31) to move along the trajectory defined by the limiting structure through the groove wall of the spiral groove (21) when driven by the motor (1) to rotate, so that the push block (31) drives the valve needle (3) to move along its own center line to the first position or the second position.

2. The hot runner needle valve type sealing mechanism (100) according to claim 1, characterized in that: A guide hole (201) is provided at one end of the transmission member (2), the spiral groove (21) is arranged on the hole wall of the guide hole (201), the push block (31) is located on the side wall of the valve needle (3), and the valve needle (3) is inserted into the guide hole (201) and slidably cooperates with the guide hole (201).

3. The hot runner needle valve type sealing mechanism (100) according to claim 1 or 2, characterized in that: The hot runner needle valve type sealing mechanism (100) includes a fixing member (4), and the limiting structure includes a limiting groove (41) arranged on the fixing member (4), and the limiting groove (41) extends along the center line direction of the valve needle (3), and the push block (31) is inserted into the limiting groove (41) and can move along the limiting groove (41); wherein, the trajectory defined by the limiting structure is the extension trajectory of the limiting groove (41).

4. The hot runner needle valve type sealing mechanism (100) according to claim 3, characterized in that: The number of the limiting grooves (41) is more than two, and the number of the pushing blocks (31) is equal to the number of the limiting grooves (41) and corresponds one to one.

5. The hot runner needle valve type sealing mechanism (100) according to claim 3, characterized in that: When a guide hole (201) is provided at one end of the transmission member (2) and a spiral groove (21) is arranged on the hole wall of the guide hole (201), the spiral groove (21) penetrates the outer wall of the transmission member (2), the fixing member (4) is sleeved on the outer side of the transmission member (2), and the push block (31) passes through the outer wall of the transmission member (2).

6. The hot runner needle valve type sealing mechanism (100) according to claim 1, 2, 4 or 5, characterized in that: The hot runner needle valve type glue sealing mechanism (100) further comprises a glue sealing valve sleeve (5), the glue sealing valve sleeve (5) being a fixed component, the glue sealing valve sleeve (5) being provided with a through-hole, the glue sealing valve sleeve (5) being sleeved on the glue sealing section of the transmission member (2) through the sleeve hole, and the sleeve hole and the glue sealing section being rotatably matched via a conical surface; The conical cone surface on the sleeve hole forms a conical hole section (51), and the larger end of the two ends of the conical hole section (51) is closer to the glue outlet (101).

7. The hot runner needle valve type sealing mechanism (100) according to claim 1, 2, 4 or 5, characterized in that: The motor (1) is a stepping motor.

8. A hot runner system, characterized in that: The hot runner needle valve type glue sealing mechanism (100) comprises any one of claims 1 to 7; the number of the glue outlets (101) is more than two, and the number of the hot runner needle valve type glue sealing mechanisms (100) is equal to the number of the glue outlets (101) and corresponds one to one; The hot runner system further comprises a control panel, which is used to control the motor (1) of each hot runner needle valve type glue sealing mechanism (100) so that each valve needle (3) does not close the corresponding glue outlet (101) at the same time.

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