CN116811148B - Needle valve adjustment mechanism and injection mold - Google Patents

Abstract

The present invention discloses a needle valve adjustment mechanism and an injection mold, comprising an adjustment seat, a driving rod, an adjustment assembly and a reset assembly, wherein a cavity and a first air inlet and a second air inlet connected to the cavity are provided inside the adjustment seat; the driving rod is rotatably connected to the adjustment seat and comprises a matching section located in the cavity, the driving rod is connected to the valve needle of the needle valve and rotates synchronously; the adjustment assembly comprises a first rotating member, a second rotating member and a driving member slidably arranged in the cavity, the first rotating member and the second rotating member are connected to the driving rod and rotate synchronously, a first cavity connected to the first air inlet is provided between the first rotating member and the driving member, and a second cavity connected to the second air inlet is provided between the second rotating member and the driving member; the reset assembly comprises an elastic member for resetting the adjustment assembly to an initial state. The needle valve adjustment mechanism and the injection mold of the present invention can adjust the position and opening of the needle valve, improve the adjustment accuracy, and reduce the occupied space.

Description

Needle valve adjustment mechanism and injection mold

Technical Field

The invention relates to the field of injection molds, and in particular to a needle valve regulating mechanism and an injection mold.

Background technique

In injection molds, the amount of glue injected is usually controlled by adjusting the position and opening of the needle valve.

In the related art, the needle valve in the injection mold is mainly adjusted by turbine mechanism drive, hydraulic adjustment or pneumatic adjustment. When the turbine mechanism is adjusted, the valve needle of the needle valve is connected to the turbine mechanism, and the turbine mechanism drives the valve needle to rotate, adjusts the position of the valve needle in the syringe, and then adjusts the position and opening of the needle valve. Among them, the turbine mechanism controls the valve needle, which has the problem of bloated structure and large space occupation; while hydraulic adjustment and pneumatic adjustment mainly drive the valve needle to move linearly through hydraulic or air pressure, thereby controlling the opening of the needle valve, and there is a problem of insufficient control accuracy.

Summary of the invention

1. Technical issues to be solved

The present invention provides a needle valve adjustment mechanism and an injection mold, which at least solve the technical problem of how to adjust the position and opening of the needle valve, improve the adjustment accuracy, and reduce the occupied space.

(II) Technical solution

In order to solve the above technical problems, the present invention provides the following technical solutions:

A needle valve adjustment mechanism, comprising:

An adjustment seat, wherein a cavity is provided inside the adjustment seat and a first air inlet hole and a second air inlet hole communicated with the cavity;

A driving rod, the driving rod is rotatably connected to the adjusting seat and comprises a matching section located in the cavity, the driving rod is connected to the valve needle of the needle valve and rotates synchronously;

An adjusting component, the adjusting component comprises a first rotating member, a second rotating member and a driving member slidably disposed in the cavity, the first rotating member and the second rotating member are connected to the driving rod and rotate synchronously, a first cavity connected to the first air inlet hole is provided between the first rotating member and the driving member, a second cavity connected to the second air inlet hole is provided between the second rotating member and the driving member, and the driving member is configured to push the second rotating member to rotate forwardly through a threaded surface under the driving of the air pressure of the first cavity, and to push the first rotating member to rotate reversely through a threaded surface under the driving of the air pressure of the second cavity;

A reset component, wherein the reset component comprises an elastic member for resetting the adjustment component to an initial state.

In some embodiments, the first rotating member, the second rotating member and the driving member of the adjustment assembly are respectively a first ratchet, an intermediate ratchet and a second ratchet which are slidably sleeved on the mating section in sequence, the first ratchet and the second ratchet are circumferentially fixed to the mating section, the intermediate ratchet is rotatably connected to the mating section, the adjustment seat comprises a guide strip located inside the cavity, the first ratchet, the intermediate ratchet and the second ratchet are slidably matched with the guide strip and are circumferentially fixed relative to the adjustment seat in the guide strip region; the ends of the intermediate ratchet, the first ratchet and the second ratchet are provided with threaded surfaces;

Wherein, the sliding path of the intermediate ratchet includes an initial position, a first position and a second position; the first ratchet and the intermediate ratchet form a first cavity connected to the first air inlet in the cavity, and the first cavity is configured to push the intermediate ratchet from the initial position to the first position by air pressure, and at the same time push the first ratchet to disengage from the guide strip, in the first position, the intermediate ratchet pushes the second ratchet through the threaded surface so that the second ratchet rotates forward after disengaging from the guide strip; the second ratchet and the intermediate ratchet form a second cavity connected to the second air inlet in the cavity, and the second cavity is configured to push the intermediate ratchet from the initial position to the second position by air pressure, and at the same time push the second ratchet to disengage from the guide strip, in the second position, the intermediate ratchet pushes the first ratchet through the threaded surface so that the first ratchet rotates in the opposite direction after disengaging from the guide strip.

In some embodiments, the first ratchet includes a plurality of first sliders arranged around the driving rod, a first guide groove is provided between adjacent first sliders, and the guide bar is slidably provided in the first guide groove; the second ratchet includes a plurality of second sliders arranged around the driving rod, a second guide groove is provided between adjacent second sliders, and the guide bar is slidably provided in the second guide groove; the intermediate ratchet includes a plurality of intermediate sliders arranged around the driving rod, an intermediate guide groove is provided between adjacent intermediate sliders, and the guide bar is slidably provided in the intermediate guide groove, the first slider, the second slider and the intermediate slider are provided with inclined surfaces, and the threaded surface is formed between the inclined surfaces of the first slider, between the inclined surfaces of the second slider and between the inclined surfaces of the intermediate slider.

In some embodiments, the first slider, the second slider and the middle slider are arranged in a group, and the first slider, the second slider and the middle slider in the same group are arranged in a direction parallel to the driving axis, the inclined surfaces of the first slider and the second slider in the same group have the same inclination and are in opposite directions, the adjacent inclined surfaces of the middle slider and the first slider in the same group have the same inclination and are in opposite directions, and the adjacent inclined surfaces of the middle slider and the second slider in the same group have the same inclination and are in opposite directions.

In some embodiments, the inclined surfaces of the first sliders have the same inclination direction, and the slope increases or decreases from the first to the last, the inclined surfaces of the middle sliders have the same inclination direction and slope, and the inclined surfaces of the second sliders have the same inclination direction, and the slope increases or decreases from the first to the last.

In some embodiments, the reset assembly includes springs located between the first ratchet and the intermediate ratchet, between the intermediate ratchet and the second ratchet, between the first ratchet and the adjustment seat, and between the second ratchet and the adjustment seat. The springs are configured as the elastic member and are sleeved on the drive rod.

In some embodiments, a guide surface is provided at the end of the guide bar, and the guide surface is an arc surface or a wedge surface symmetrically arranged along the center line of the guide bar.

In some embodiments, the mating section of the driving rod includes a circular shaft and two sections of non-circular shafts respectively connected to the two ends of the circular shaft, the first ratchet and the second ratchet are each provided with an axial hole adapted to the non-circular shaft, and are sleeved and circumferentially fixed with the non-circular shaft through the axial hole, and the middle ratchet is provided with a circular hole, and is rotatably connected to the round shaft through the circular hole.

In some embodiments, the needle barrel of the needle valve is fixed relative to the mold, and the valve needle is provided with threads and connected to the mold via the threads, so that the depth of the valve needle inserted into the needle barrel can be adjusted via the threads when the valve needle rotates.

The present invention also provides an injection mold, comprising the needle valve regulating mechanism.

(III) Beneficial effects

Compared with the prior art, the needle valve adjustment mechanism provided by the present invention has the following beneficial effects:

The working process of the needle valve adjustment mechanism and the injection mold is as follows: when air is taken in through the first air inlet hole, the airflow pushes the driving member to move toward the second rotating member, and the driving member pushes the second rotating member to rotate forwardly through the threaded surface, thereby driving the driving rod and the valve needle to rotate, and the valve needle cooperates with the mold through the thread and moves axially during the rotation, thereby positively adjusting the opening of the needle valve; when air is taken in through the second air inlet hole, the airflow pushes the driving member to move toward the first rotating member, and the driving member pushes the first rotating member to rotate in the opposite direction through the opposite threaded surface, thereby driving the driving rod and the valve needle to rotate, and the valve needle cooperates with the mold through the thread and moves axially during the rotation, thereby reversely adjusting the opening of the needle valve; after the adjustment is completed, the adjustment component can be reset under the drive of the reset component; wherein the driving rod, the adjustment component and the reset component are concentratedly arranged inside the cavity, and are generally arranged in a straight line, occupying a small space; the linear drive of the driving member by the airflow is converted into the rotation of the driving rod and the valve needle, so that the valve needle can be screwed in relative to the syringe thread in the injection mold, thereby improving the accuracy of the needle valve adjustment opening. It can be seen that the needle valve adjustment mechanism and the injection mold of the present invention can adjust the position and opening of the needle valve, improve the adjustment accuracy, and reduce the occupied space.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of a needle valve adjustment mechanism and an injection mold in an embodiment;

FIG2 is a cross-sectional perspective view of a needle valve adjustment mechanism in an embodiment;

FIG3 is a three-dimensional view of the needle valve adjustment mechanism in the embodiment after the cylinder is removed;

FIG4 is a front view of the needle valve adjustment mechanism in the embodiment;

FIG5 is a schematic diagram of section A in FIG4 ;

FIG6 is a schematic diagram of section B in FIG4 ;

FIG7 is a schematic diagram of section C in FIG4 ;

FIG8 is a perspective view of a cylindrical half-section state of the adjustment seat in the embodiment;

FIG9 is a perspective view of a driving rod in an embodiment;

FIG10 is a perspective view of a first ratchet wheel in an embodiment;

FIG11 is a perspective view of a second ratchet wheel in the embodiment;

FIG. 12 is a perspective view of the intermediate ratchet in the embodiment.

Reference numerals:

Adjustment seat 1, cavity 10, first air inlet hole 11, second air inlet hole 12, guide strip 13, guide surface 130;

Driving rod 2, matching section 20, round shaft 201, non-round shaft 202;

Adjustment assembly 3, first rotating member 31, driving member 32, second rotating member 33, first cavity 34, second cavity 35, threaded surface 300, inclined surface 301, first ratchet 310, first slider 311, first guide groove 312, intermediate ratchet 320, intermediate slider 321, intermediate guide groove 322, second ratchet 330, second slider 331, second guide groove 332;

Reset component 4, elastic member 40;

Needle valve 5 , valve needle 51 , syringe 52 , and socket 510 .

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

In the related art, the needle valve in the injection mold is mainly adjusted by turbine mechanism drive, hydraulic adjustment or pneumatic adjustment. When the turbine mechanism is adjusted, the valve needle of the needle valve is connected to the turbine mechanism, and the turbine mechanism drives the valve needle to rotate, adjusts the position of the valve needle in the syringe, and then adjusts the position and opening of the needle valve. Among them, the turbine mechanism controls the valve needle, which has the problem of bloated structure and large space occupation; while hydraulic adjustment and pneumatic adjustment mainly drive the valve needle to move linearly through hydraulic or air pressure, thereby controlling the opening of the needle valve, and there is a problem of insufficient control accuracy.

To solve the above technical problems, the present embodiment provides: a needle valve adjustment mechanism, refer to Figures 1 to 3, Figure 1 is a cross-sectional view of the needle valve adjustment mechanism and the injection mold in the embodiment, Figure 2 is a cross-sectional stereoscopic view of the needle valve adjustment mechanism in the embodiment, and Figure 3 is a stereoscopic view of the needle valve adjustment mechanism in the embodiment after removing the cylinder.

The needle valve adjustment mechanism of this embodiment includes: an adjustment seat 1 , a driving rod 2 , an adjustment component 3 and a reset component 4 .

The adjusting seat 1 has a cavity 10 and a first air inlet 11 and a second air inlet 12 communicating with the cavity 10 .

The above-mentioned adjustment seat 1 serves as an installation carrier for the driving rod 2, the adjustment component 3 and the reset component 4, which can be composed of a cylinder and end plates covering both ends of the cylinder. The above-mentioned first air inlet hole 11 and the second air inlet hole 12 are arranged on the cylinder; the first air inlet hole 11 and the second air inlet hole 12 are used to connect with the air supply device to transport air flow into the cavity 10; the guide strip 13 can be integrally formed on the inner side of the cylinder.

The driving rod 2 is rotatably connected to the adjusting seat 1 and includes a matching section 20 located in the cavity 10 . The driving rod 2 is connected to the valve needle 51 of the needle valve 5 and rotates synchronously.

The mating section 20 of the above-mentioned drive rod 2 is used to connect and cooperate with the adjustment component 3. The drive rod 2 and the valve needle 51 can be connected inside or outside the adjustment seat 1. The drive rod 2 is connected to the valve needle 51 of the needle valve 5 and rotates synchronously in a manner that a socket 510 is opened at the end of the valve needle 51, and the socket 510 is a non-circular hole. The shape of the end of the drive rod 2 is adapted to the socket 510 and inserted into the socket 510. The drive rod 2 can axially extend and retract in the socket 510, but is circumferentially restricted by the shape of the socket 510 and the end of the drive rod 2 and cannot rotate in the socket 510, thereby achieving synchronous rotation.

The adjusting assembly 3 includes a first rotating member 31, a driving member 32 and a second rotating member 33 which are slidably arranged in the cavity 10. The first rotating member 31 and the second rotating member 33 are connected to the driving rod 2 and rotate synchronously. A first cavity 34 which is connected to the first air inlet hole 11 is provided between the first rotating member 31 and the driving member 32. A second cavity 35 which is connected to the second air inlet hole 12 is provided between the second rotating member 33 and the driving member 32. The driving member 32 is configured to push the second rotating member 33 to rotate forward through the threaded surface 300 under the driving of the air pressure in the first cavity 34, and to push the first rotating member 31 to rotate reversely through the threaded surface 300 under the driving of the air pressure in the second cavity 35.

The above-mentioned adjustment component 3 is used to control the rotation of the driving rod 2, wherein the threaded surface 300 can be opened on the first rotating member 31 and the second rotating member 33, and can also be opened on the driving member 22. Of course, it can also be set at the same time. For example, threaded surfaces 300 can be set at both ends of the driving member 32 to push the first rotating member 31 and the second rotating member 33 to rotate, and the first rotating member 31 and the second rotating member 33 are also provided with push surfaces or threaded surfaces 300 that cooperate with the threaded surfaces 300; it can be understood that the first cavity 34 and the second cavity 35 are not connected, that is, when the first air inlet hole 11 fills the first cavity 34 with air flow, it will not affect the air pressure in the second cavity 35, and when the second air inlet hole 12 fills the second cavity 35 with air flow, it will not affect the air pressure in the first cavity 34.

The reset assembly 4 includes an elastic member 40 for resetting the adjustment assembly 3 to an initial state.

The number and installation position of the above-mentioned elastic members 40 can be selected according to the structure of the adjustment seat 1 and the adjustment component 3. They can be components with elastic deformation ability such as springs and rubber rings. The elastic members 40 are compressed when the adjustment component 3 moves, and the adjustment component 3 is reset by the elastic force generated by the compression.

The needle valve adjustment mechanism and the injection mold of the above technical solution work as follows: when air is introduced into the first air inlet 11, the airflow pushes the driving member 32 to move toward the second rotating member 33, and the driving member 32 pushes the second rotating member 33 to rotate positively through the threaded surface 300, thereby driving the driving rod 2 and the valve needle 51 to rotate. The valve needle 51 cooperates with the mold through the thread and moves axially during the rotation, thereby positively adjusting the opening of the needle valve 5; when air is introduced into the second air inlet 12, the airflow pushes the driving member 32 to move toward the first rotating member 31, and the driving member 32 pushes the first rotating member 31 in the opposite direction through the opposite threaded surface 300. Rotate, thereby driving the driving rod 2 and the valve needle 51 to rotate, the valve needle 51 cooperates with the mold through the thread and moves axially during the rotation, thereby reversely adjusting the opening of the needle valve 5; after the adjustment is completed, the adjustment component 3 can be reset under the drive of the reset component 4; wherein, the driving rod 2, the adjustment component 3 and the reset component 4 are centrally arranged inside the cavity 10, and are generally arranged in a straight line, occupying a small space; the linear drive of the driving member 32 by the airflow is converted into the rotation of the driving rod 2 and the valve needle 51, so that the valve needle 51 can be screwed in relative to the needle cylinder 52 thread in the injection mold, thereby improving the accuracy of adjusting the opening of the needle valve 5. It can be seen that the needle valve adjustment mechanism mold of the present invention can adjust the position and opening of the needle valve 5, improve the adjustment accuracy, and reduce the occupied space.

2 to 7 , FIG. 4 is a front view of the needle valve adjustment mechanism in the embodiment, FIG. 5 is a schematic diagram of section A in FIG. 4 , FIG. 6 is a schematic diagram of section B in FIG. 4 , and FIG. 7 is a schematic diagram of section C in FIG. 4 . In one embodiment of the adjustment component 3, the first rotating member 31, the second rotating member 33 and the driving member 32 of the adjustment component 3 are respectively the first ratchet 310, the intermediate ratchet 320 and the second ratchet 330 which are slidably sleeved on the matching section 20 in sequence, the first ratchet 310 and the second ratchet 330 are circumferentially fixed to the matching section 20, the intermediate ratchet 320 is rotatably connected to the matching section 20, the adjustment seat 1 includes a guide bar 13 located inside the cavity 10, the first ratchet 310, the intermediate ratchet 320 and the second ratchet 330 are slidably matched with the guide bar 13 and are circumferentially fixed relative to the adjustment seat 1 in the guide bar 13 area, that is, the guide bar 13 can prevent the first ratchet 310, the intermediate ratchet 320 and the second ratchet 330 from rotating circumferentially; the ends of the intermediate ratchet 320, the first ratchet 310 and the second ratchet 330 are provided with the above-mentioned threaded surface 300, and the threaded surface 300 can be a continuous or discontinuous threaded surface 300; wherein the sliding path of the intermediate ratchet 320 includes an initial position, a first position and The second position; in the initial position, the intermediate ratchet 320 can be in a stationary state; the first ratchet 310 and the intermediate ratchet 320 form a first cavity 34 connected to the first air inlet hole 11 in the cavity 10, and the first cavity 34 is configured to push the intermediate ratchet 320 from the initial position to the first position by air pressure, and at the same time push the first ratchet 310 to disengage from the guide strip 13. In the first position, the intermediate ratchet 320 pushes the second ratchet 330 through the threaded surface 300, so that the second ratchet 330 rotates forward after disengaging from the guide strip 13; the second ratchet 330 and the intermediate ratchet 320 form a second cavity 35 connected to the second air inlet hole 12 in the cavity 10, and the second cavity 35 is configured to push the intermediate ratchet 320 from the initial position to the second position by air pressure, and at the same time push the second ratchet 330 to disengage from the guide strip 13. In the second position, the intermediate ratchet 320 pushes the first ratchet 310 through the threaded surface 300, so that the first ratchet 310 rotates in the opposite direction after disengaging from the guide strip 13. In this implementation direction, the middle ratchet 320 pushes the first ratchet 310 and the second ratchet 330 through the threaded surface 300 in two stages. In the first stage, the first ratchet 310 and the second ratchet 330 are circumferentially limited by the guide bar 13 and make linear motion. In the second stage, the first ratchet 310 and the second ratchet 330 are disengaged from the guide bar 13 and make rotational motion. Specifically, the first air inlet 11 takes in air, and under the influence of the air pressure of the first cavity 34, the first ratchet 310 moves upward to get out of the range of the guide bar 13, and the middle ratchet 320 moves downward, pushing the second ratchet 330 out of the range of the guide bar 13. Subsequently, the threaded surfaces 300 between the middle ratchet 320 and the second ratchet 330 squeeze each other, causing the second ratchet 330 to rotate, thereby driving the drive rod 2 to rotate. After the first air inlet 11 stops taking in air, the adjustment component 3 is reset under the action of the elastic member 40; conversely, the lower air inlet takes in air, which can reverse the drive rod 2, so that the valve needle 51 is driven forward and reversed through the drive rod 2, and the valve needle 51 is moved up and down through the thread on the valve needle 51, thereby adjusting the opening of the needle valve 5 and the amount of glue. In this embodiment, the needle valve adjustment mechanism has the advantages of simple and ingenious structure, small space occupation, and high adjustment accuracy.

2, FIG3 and FIG10 to FIG12, wherein FIG10 is a stereoscopic view of the first ratchet in the embodiment, FIG11 is a stereoscopic view of the second ratchet in the embodiment, and FIG12 is a stereoscopic view of the intermediate ratchet in the embodiment. In one embodiment, the first ratchet 310, the intermediate ratchet 320 and the second ratchet 330 are slidably matched with the guide bar 13 and are circumferentially fixed relative to the adjustment seat 1 in the guide bar 13 area, the first ratchet 310 includes a plurality of first sliders 311 arranged around the drive rod 2, a first guide groove 312 is provided between adjacent first sliders 311, and the guide bar 13 is slidably arranged in the first guide groove 312; the second ratchet 330 includes a plurality of second sliders 331 arranged around the drive rod 2, a second guide groove 332 is provided between adjacent second sliders 331, and the guide bar 13 is slidably arranged in the second guide groove 332; the intermediate ratchet 320 includes a plurality of intermediate sliders 321 arranged around the drive rod 2, an intermediate guide groove 322 is provided between adjacent intermediate sliders 321, and the guide bar 13 is slidably arranged in the intermediate guide groove 322.

Referring to FIG. 3 , in one embodiment in which the ends of the intermediate ratchet 320, the first ratchet 310 and the second ratchet 330 are provided with threaded surfaces 300, the first slider 311, the second slider 331 and the intermediate slider 321 are provided with inclined surfaces 301, and the threaded surfaces 300 are formed between the inclined surfaces 301 of the first slider 311, between the inclined surfaces 301 of the second slider 331 and between the inclined surfaces 301 of the intermediate slider 321. The intermediate ratchet 320 pushes the first ratchet 310 or the second ratchet 330 to rotate through the threaded surface 300, specifically including the intermediate slider 321 squeezing the inclined surface 301 of each first slider 311 or the second slider 331 through the inclined surface 301 in turn, so that the first slider 311 and the second slider 331 are subjected to the force that causes the first ratchet 310 and the second ratchet 330 to rotate circumferentially. In this arrangement, the first slider 311, the second slider 331 and the intermediate slider 321 can cooperate with the guide bar 13 for guidance, and can also form a threaded surface 300 through the inclined surface 301 to realize the rotation function.

Further, the first slider 311, the second slider 331 and the middle slider 321 are arranged in a group, and the first slider 311, the second slider 331 and the middle slider 321 in the same group are arranged in a direction parallel to the driving axis, the inclined surfaces 301 of the first slider 311 and the second slider 331 in the same group have the same inclination and are in opposite directions, the adjacent inclined surfaces 301 of the middle slider 321 and the first slider 311 in the same group have the same inclination and are in opposite directions, and the adjacent inclined surfaces 301 of the middle slider 321 and the second slider 331 in the same group have the same inclination and are in opposite directions; the inclined surfaces 301 of the first slider 311 have the same inclination, and the slope increases or decreases from the first to the last, the inclined surfaces 301 of the middle slider 321 have the same inclination and slope, and the inclined surfaces 301 of the second slider 331 have the same inclination, and the slope increases or decreases from the first to the last.

Referring to Figure 2, in one embodiment of the above-mentioned reset assembly 4, the reset assembly 4 includes springs located between the first ratchet 310 and the intermediate ratchet 320, between the intermediate ratchet 320 and the second ratchet 330, between the first ratchet 310 and the adjustment seat 1, and between the second ratchet 330 and the adjustment seat 1. The spring is configured as an elastic member 40 and is sleeved on the drive rod 2.

Referring to Figure 8, in order to facilitate the first ratchet 310 and the second ratchet 330 to be reset to the position cooperating with the guide bar 13, a guide surface 130 is provided at the end of the guide bar 13, and the guide surface 130 is an arc surface or a wedge surface symmetrically arranged along the center line of the guide bar 13. With such an arrangement, when the first ratchet 310 and the second ratchet 330 are reset, under the push of the elastic member 40, the first slider 311 and the second slider 331 can automatically enter between the guide bars 13 through the inclined surface 301 and the guide surface 130, and the entry action is smoother, which can effectively reduce the wear of components and avoid abnormal noise between components.

Referring to Figure 9, in some embodiments, in order to achieve the connection and synchronous rotation of the first rotating member 31 and the second rotating member 33 with the driving rod 2, the mating section 20 of the driving rod 2 includes a circular shaft 201 and two sections of non-circular shafts 202 respectively connected to the two ends of the circular shaft 201, the first ratchet 310 and the second ratchet 330 are each provided with an axial hole adapted to the non-circular shaft 202, and are sleeved and circumferentially fixed with the non-circular shaft 202 through the axial hole, and the middle ratchet 320 is provided with a circular hole, and is rotatably connected to the circular shaft 201 through the circular hole.

Referring to FIG. 1 , in one installation method of the needle valve 5 and the needle valve adjustment mechanism on the mold, the needle barrel 52 of the needle valve 5 is fixed relative to the mold, and the valve needle 51 is provided with threads and connected to the mold through the threads, so that when the valve needle 51 rotates, the depth of the valve needle 51 inserted into the needle barrel 52 can be adjusted by the threads, that is, the valve needle 51 can be gradually screwed into the needle barrel 52, which has higher adjustment accuracy than the method of adjusting the opening by linear movement.

Referring to FIG. 1 , this embodiment provides an injection mold, including the needle valve adjustment mechanism described above. Through the application of the needle valve adjustment mechanism, the injection mold can adjust the opening and glue amount of the needle valve 5 , improve the adjustment accuracy, and reduce the overall occupied space.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A needle valve adjustment mechanism, characterized by comprising: An adjustment seat, wherein a cavity is provided inside the adjustment seat and a first air inlet hole and a second air inlet hole communicated with the cavity; A driving rod, the driving rod is rotatably connected to the adjusting seat and comprises a matching section located in the cavity, the driving rod is connected to the valve needle of the needle valve and rotates synchronously; An adjusting component, the adjusting component comprises a first rotating member, a second rotating member and a driving member slidably disposed in the cavity, the first rotating member and the second rotating member are connected to the driving rod and rotate synchronously, a first cavity connected to the first air inlet hole is provided between the first rotating member and the driving member, a second cavity connected to the second air inlet hole is provided between the second rotating member and the driving member, and the driving member is configured to push the second rotating member to rotate forwardly through a threaded surface under the driving of the air pressure of the first cavity, and to push the first rotating member to rotate reversely through a threaded surface under the driving of the air pressure of the second cavity; A reset assembly, the reset assembly comprising an elastic member for resetting the adjustment assembly to an initial state; The first rotating member, the second rotating member and the driving member of the adjusting assembly are respectively a first ratchet, an intermediate ratchet and a second ratchet which are slidably sleeved on the matching section in sequence, the first ratchet and the second ratchet are circumferentially fixed to the matching section, the intermediate ratchet is rotatably connected to the matching section, the adjusting seat comprises a guide strip located inside the cavity, the first ratchet, the intermediate ratchet and the second ratchet are slidably matched with the guide strip and are circumferentially fixed relative to the adjusting seat in the guide strip area; the ends of the intermediate ratchet, the first ratchet and the second ratchet are provided with the threaded surface; Wherein, the sliding path of the intermediate ratchet includes an initial position, a first position and a second position; the first ratchet and the intermediate ratchet form a first cavity connected to the first air inlet in the cavity, and the first cavity is configured to push the intermediate ratchet from the initial position to the first position by air pressure, and at the same time push the first ratchet to disengage from the guide strip, in the first position, the intermediate ratchet pushes the second ratchet through the threaded surface, so that the second ratchet rotates forward after disengaging from the guide strip; the second ratchet and the intermediate ratchet form a second cavity connected to the second air inlet in the cavity, and the second cavity is configured to push the intermediate ratchet from the initial position to the second position by air pressure, and at the same time push the second ratchet to disengage from the guide strip, in the second position, the intermediate ratchet pushes the first ratchet through the threaded surface, so that the first ratchet rotates reversely after disengaging from the guide strip; The first ratchet comprises a plurality of first sliders arranged around the driving rod, a first guide groove is provided between adjacent first sliders, and the guide bar is slidably provided in the first guide groove; the second ratchet comprises a plurality of second sliders arranged around the driving rod, a second guide groove is provided between adjacent second sliders, and the guide bar is slidably provided in the second guide groove; the intermediate ratchet comprises a plurality of intermediate sliders arranged around the driving rod, an intermediate guide groove is provided between adjacent intermediate sliders, and the guide bar is slidably provided in the intermediate guide groove, the first slider, the second slider and the intermediate slider are provided with inclined surfaces, and the threaded surface is formed between the inclined surfaces of the first slider, between the inclined surfaces of the second slider and between the inclined surfaces of the intermediate slider; The reset assembly includes springs located between the first ratchet and the middle ratchet, between the middle ratchet and the second ratchet, between the first ratchet and the adjustment seat, and between the second ratchet and the adjustment seat. The springs are configured as the elastic member and are sleeved on the drive rod. 2. The needle valve adjustment mechanism according to claim 1 is characterized in that the first slider, the second slider and the middle slider are arranged in a group, and the first slider, the second slider and the middle slider in the same group are arranged in a direction parallel to the drive axis, the inclined surfaces of the first slider and the second slider in the same group have the same inclination and are in opposite directions, the adjacent inclined surfaces of the middle slider and the first slider in the same group have the same inclination and are in opposite directions, and the adjacent inclined surfaces of the middle slider and the second slider in the same group have the same inclination and are in opposite directions. 3. The needle valve adjustment mechanism according to claim 2 is characterized in that the inclined surfaces of the first sliders have the same inclination direction, and the slope increases or decreases from the first to the last, the inclined surfaces of the middle sliders have the same inclination direction and slope, and the inclined surfaces of the second sliders have the same inclination direction, and the slope increases or decreases from the first to the last. 4. The needle valve adjustment mechanism according to claim 1 is characterized in that a guide surface is provided at the end of the guide strip, and the guide surface is an arc surface or a wedge surface symmetrically arranged along the center line of the guide strip. 5. The needle valve adjustment mechanism according to claim 1 is characterized in that the mating section of the drive rod includes a circular shaft and two sections of non-circular shafts respectively connected to the two ends of the circular shaft, the first ratchet and the second ratchet are each provided with an axial hole adapted to the non-circular shaft, and are sleeved and circumferentially fixed with the non-circular shaft through the axial hole, and the middle ratchet is provided with a circular hole, and is rotatably connected to the circular shaft through the circular hole. 6. The needle valve adjustment mechanism according to claim 1 is characterized in that the needle barrel of the needle valve is fixed relative to the mold, and the valve needle is provided with a thread and connected to the mold through the thread, so that the depth of the valve needle inserted into the needle barrel can be adjusted through the thread when the valve needle rotates. 7. An injection mold, characterized by comprising the needle valve adjustment mechanism according to claim 1.