CN115532540A

CN115532540A - Multi-point glue injection gun

Info

Publication number: CN115532540A
Application number: CN202211523738.7A
Authority: CN
Inventors: 朱建晓
Original assignee: Suzhou Konig Electronic Technology Co ltd
Current assignee: Suzhou Konig Electronic Technology Co ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2022-12-30
Anticipated expiration: 2042-12-01
Also published as: CN115532540B

Abstract

The application discloses multiple spot injecting glue rifle to reduce out jiao kou interval, it is extravagant to reduce the sizing material, wherein, multiple spot injecting glue rifle includes: a main body; a drive assembly; a valve needle adjustment assembly; the main body is provided with a plurality of valve cavities which penetrate through the main body along the axial direction; the plurality of valve cavities are arranged in parallel at intervals; a glue solution flow channel communicated with the plurality of valve cavities is also arranged in the main body, and the glue solution flow channel is provided with a glue solution input end for inputting a preset pressure glue solution; each valve cavity is provided with a valve needle capable of moving axially; a sealing structure is arranged between the valve needle and the main body; the valve needle adjusting assembly is connected with a plurality of valve needles and can be used for operatively adjusting the axial position of each valve needle; the driving assembly can drive the valve needle to move to a gun sealing position for sealing the gun head glue outlet from an opening position for opening the gun head glue outlet along the axial direction.

Description

Multi-point glue injection gun

Technical Field

The application relates to the field of injection molding, in particular to a multi-point glue injection gun.

Background

The glue injection gun of the low-pressure glue injection machine (including an imported low-pressure glue injection machine) used in the market at present adopts a method of directly machining on a gun body to make movable fit of a valve needle hole and a valve needle, and an O-shaped sealing ring is added for sealing at the same time, so that glue leakage from a movable fit gap between the valve needle and the hole is prevented. The method has the defects of high processing difficulty, difficulty in ensuring the smoothness and the precision of the processed matching hole and corresponding dimensional tolerance and form and position tolerance, and influence on wear resistance due to the fact that the surface hardness of the hole is improved. The valve needle and the gun body are easy to wear, the service life of the glue injection gun is short, and the glue injection gun can not be maintained and repaired and can only be replaced by a new glue injection gun. Resulting in an increase in use cost.

In order to solve the problems, the applicant applies a utility model patent with the publication number of CN203459234U in 24/7/2013, which discloses a gun body of an injection gun, a gun nozzle and a cylinder installed at the tail end of the gun body, a valve needle seat is further arranged between the gun body and a cylinder fixing plate, the valve needle seat is fixed on a piston rod of the cylinder, the front end of the valve needle is matched with the gun nozzle and is pressed against the gun nozzle, thereby achieving the advantages of improving the processing precision, ensuring the form and position tolerance, improving the wear resistance and the like, but the valve needle seat cannot heat a runner to form a hot runner, cold glue can occur in the using process, and the effect of injecting glue and sealing glue is influenced.

Therefore, the applicant filed an invention patent with the publication number CN113814129a named as a hot runner glue gun on 17/10/2021 to meet the requirement of hot runner glue injection. According to the patent applied by the applicant, the existing glue injection guns are single-gun-head glue injection guns, and can perform array arrangement on a plurality of glue injection guns for glue injection in order to improve efficiency, but because the glue injection guns are mutually independent, the distance between glue outlets is still overlarge (because the glue injection guns or hot runner glue injection structures in the existing market have larger volumes, certain limit requirements on the distance between the glue injection points generally require more than 25 mm), for workpieces with smaller layout requirements on the product glue injection points, the distance between the glue outlets is larger, and a cold runner is required to be used for guiding glue to the required glue injection points (for example, the product requirements on glue injection are within 20mm or within 16mm, the glue injection guns or hot runner glue injection structures in the market cannot meet), so that excessive material at a water gap, overlarge ratio and serious glue waste are caused.

Disclosure of Invention

The inventor researches and discovers that each glue injection gun can independently and respectively inject glue into the corresponding cavity, and the gun body main body is provided with the corresponding flow channel and the heating pipe, so that the size of the gun body main body is limited, and the distance between glue outlets is difficult to reduce. However, further research has found that it is difficult to satisfy simultaneous gun sealing among a plurality of valve needles when a plurality of glue injection guns are integrated, and the valve needle of the existing independent glue injection gun is independently screwed into a valve needle seat (for example, a hot runner glue gun of CN 202111206541.6) for regulation, so that such a structure cannot satisfy simultaneous regulation of a plurality of valve needles and cannot satisfy simultaneous gun sealing of a plurality of valve needles.

In view of the research and analysis, the following technical scheme of the multi-point glue injection gun is adopted in the application:

a multi-point glue injection gun comprising: a main body; a drive assembly; a valve needle adjustment assembly;

the main body is provided with a plurality of valve cavities which penetrate through the main body along the axial direction; the plurality of valve cavities are arranged in parallel at intervals; a glue solution flow channel communicated with the plurality of valve cavities is also arranged in the main body, and the glue solution flow channel is provided with a glue solution input end for inputting a preset pressure glue solution; each valve cavity is provided with a valve needle capable of moving axially; a sealing structure is arranged between the valve needle and the main body;

the valve needle adjusting assembly is connected with a plurality of valve needles and can be used for operatively adjusting the axial position of each valve needle; the driving assembly can drive the valve needle to move from an opening position for opening the glue outlet to a gun sealing position for sealing the glue outlet along the axial direction.

A glue injection gun comprising:

the valve comprises a main body, a valve body and a valve body, wherein the main body is provided with a plurality of valve cavities which penetrate through the main body along the axial direction; the plurality of valve cavities are arranged in parallel at intervals; a glue solution flow channel communicated with the plurality of valve cavities is also arranged in the main body, and the glue solution flow channel is provided with a glue solution input end for inputting glue solution; each valve cavity is provided with a valve needle capable of moving axially; the valve needle has a first axial position and a second axial position in the axial direction;

and the driving assembly is used for driving the valve needle to move from the first axial position to the second axial position along the axial direction.

Preferably, the first axial position is an opening position for opening the glue outlet; and the second axial position is a gun sealing position for sealing the glue outlet.

Preferably, the valve needle adjusting assembly comprises a plurality of adjusting rods corresponding to the valve needles one by one; the adjusting rod can be operated to move along a transverse direction perpendicular to the axial direction; the adjusting rod is provided with a first matching part, and the valve needle is provided with a second matching part; the transverse movement of the adjusting rod forms an axial movement of the valve needle by means of the cooperation of the first and second cooperating portions.

Preferably, at least one of the first fitting portion and the second fitting portion is provided with an inclined surface.

Preferably, the first matching part is a first inclined plane, and the second matching part is a second inclined plane located on one side of the first inclined plane close to the lance head; the first inclined surface and the second inclined surface are both planes.

Preferably, the valve needle has a throat; the narrow part forms side grooves distributed on two sides of the valve needle; one end of the adjusting rod is provided with a left fork head and a right fork head which are respectively inserted into the side grooves on the two sides; the first inclined plane is arranged on one side of the left fork head and the right fork head close to the gun head; and a second inclined plane is arranged on the side surface of the side groove, which is close to the gun head.

Preferably, the valve needle adjusting assembly fixes the relative position of the valve needle and the valve needle in an axially adjustable manner.

Preferably, the valve needle adjustment assembly is provided with a reset member that applies a biasing force to the valve needle to move toward the open position; the first engaging portion applies a force to the second engaging portion in a direction opposite to the biasing force.

Preferably, the reset piece comprises a reset spring sleeved outside the valve needle; one end of the return spring, which is close to the gun head, is fixed on the valve needle adjusting assembly, and one end of the return spring, which is far away from the gun head, is propped against the valve needle; the first matching part is positioned on one side of the second matching part, which is far away from the gun head.

Preferably, the valve needle adjusting assembly is provided with a plurality of guide channels extending along the transverse direction; the adjusting rods are accommodated in the guide channels in a one-to-one correspondence manner and can move transversely; the valve needles penetrate through the guide channels in a one-to-one correspondence manner; the valve needle adjusting assembly is also provided with a screw hole communicated with the guide channel at one end of the adjusting rod far away from the valve needle; the screw hole is in threaded connection with an adjusting screw; one end of the adjusting screw is an operating end, and the other end of the adjusting screw is propped against the adjusting rod.

Preferably, the needle adjustment assembly is axially movably disposed between the drive assembly and the main body; the valve needle adjusting assembly comprises a valve needle cover plate, a valve needle plate and an adjusting plate which are fixedly connected in a stacking mode; the valve needles are positioned on one side of the valve needle cover plate far away from the driving assembly, and penetrate through the valve needle plate and the adjusting plate; the valve needle cover plate is connected with the driving assembly and is driven by the driving assembly;

the valve needle plate is provided with a plurality of first mounting holes which penetrate through the valve needle plate along the axial direction; the adjusting plate is provided with a plurality of second mounting holes which penetrate through the adjusting plate along the axial direction; the second mounting holes are communicated with the first mounting holes in a one-to-one alignment manner and are penetrated by the valve needle; the upper end of the valve needle is provided with a reset ring platform; a fixed step is arranged in the first mounting hole; the reset spring is limited between the reset ring platform and the fixed step; the upper end of the valve needle is fixedly connected with an anti-rotation rod vertical to the valve needle; the valve needle plate is also provided with an anti-rotation groove communicated with the first mounting hole; the anti-rotation rod is accommodated in the anti-rotation groove; the guide channel forms an observation hole at one side of the valve needle adjusting component back to the screw hole; the cross section of the guide channel is matched with the cross section of the adjusting rod.

Preferably, the distance between the glue outlets of two adjacent gun heads is less than 20 mm.

Preferably, the main body is an integrally formed structure; the valve needle is of an integrally formed structure; the valve cavities are arranged in parallel in a row.

Preferably, a baffle is fixedly arranged at one end of the adjusting plate; the baffle plate is provided with a baffle hole for the adjusting screw to pass through; an elastic piece for applying a biasing force to the adjusting rod is arranged between the baffle and the adjusting rod.

Preferably, the drive assembly comprises at least one air cylinder; each cylinder correspondingly drives more than two valve needles.

Preferably, one end of the valve cavity is fixedly connected with a gun head with a glue outlet; or the multipoint glue injection gun is detachably butted with the mould and is provided with a gun head with a glue outlet.

Preferably, the lance tip is integrally formed with the main body; the glue outlet is formed in one end of the main body.

This disclosed multiple spot injecting glue rifle sets up a plurality of needle sets collectively in same main part, reduces rifle head interval, is convenient for dock with the less work piece of product injecting glue point overall arrangement requirement, need not to set up the cold runner and passes through, reduces the production of mouth of a river material, and then reduces extravagantly.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a perspective view of a multi-point glue injection gun according to an embodiment of the present disclosure;

FIG. 2 is a block diagram of the valve pin assembly of FIG. 1;

FIG. 3 is a partial block diagram of FIG. 2;

FIG. 4 is a view of the valve needle plate of FIG. 1;

FIG. 5 is a block diagram of the regulating plate of FIG. 1 in cooperation with a valve needle;

FIG. 6 is a view of the regulating plate of FIG. 5;

FIG. 7 is a longitudinal section of FIG. 1;

fig. 8 is a cross-sectional view of fig. 1.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terms "up, down, left and right" described in the present disclosure are defined according to the direction when facing fig. 7, and it is understood that "axial" is the "up-down direction", or, taking a return spring as an example, the end away from the lance tip is the upper end, and the end close to the lance tip is the lower end; "front-to-back" is defined in terms of the length direction (transverse) of the adjustment rod, for example: the regulating rod moves forward towards the valve needle and moves backward away from the valve needle.

As shown in fig. 1 to 8, one embodiment of the present disclosure provides a multi-point glue injection gun, including: a main body 4; a drive assembly; valve needle adjustment assembly.

The main body 4 is provided with a plurality of valve cavities which penetrate through the main body along the axial direction; the valve cavities are arranged in parallel at intervals. A glue solution flow passage 15 which is communicated with the plurality of valve cavities is also arranged in the main body 4; the glue solution flow channel 15 is used for being introduced with glue solution with preset pressure. Each of said valve chambers is provided with an axially movable valve needle 20. One end of the valve cavity is fixedly connected with a gun head 5.

The gun head 5 can be assembled on the main body in a split mode or integrated on the main body in an integrated mode, and a plurality of glue outlets are formed in the lower end (end face) of the main body. In other embodiments, the gun heads can be assembled and integrated on the mold, and the multipoint glue injection gun and the gun heads on the mold can be detachably assembled and butted to realize glue injection when glue injection is needed.

The glue solution flow channel 15 comprises a main flow channel and a communicating flow channel which are vertical to the axial direction. The main flow channel extends along a straight line; the plurality of communicating flow passages communicate the plurality of valve cavities with the glue solution flow passage 15 in a one-to-one correspondence manner. The communicating flow passage is vertically communicated with the main flow passage and the valve cavity. The valve cavity is perpendicular to the glue solution flow passage 15. One end of the glue solution flow channel 15 (main flow channel) is a blocking end, and the other end forms an opening on the side wall of the main body 4 to form a glue solution input end. The glue solution input end is communicated with a glue solution input joint 3. The glue liquid input joint inputs the glue liquid with preset pressure (constant pressure, less than 3 Mpa) to realize isobaric glue injection.

The valve needle 20 has a plurality of axial positions: a first axial position and a second axial position below the first axial position. Wherein the drive assembly is operable to move the valve needle 20 between the first axial position and the second axial position. In particular, the valve needle 20 has a gun sealing position for sealing the glue outlet, and the gun sealing position may correspond to the second axial position of the valve needle 20. The gun head 5 is provided with a glue outlet, and the lower end of the valve needle 20 is inserted into the glue outlet to plug the glue outlet, so that the gun head 5 is plugged to block glue outlet. The valve needle 20 also has an open position in which the lance tip 5 is open, which may correspond to a first axial position of the valve needle. The valve needle 20 is used for sealing and opening as the up-and-down movement, wherein the opening position is the top dead center position of the valve needle 20, and the gun sealing position is the bottom dead center position of the valve needle 20.

As shown in fig. 7, the distance L between the glue outlets of two adjacent lance heads 5 is less than 20mm, and the distance L between two adjacent valve needles is less than 20 mm. Further, the distance L between the glue outlets or the valve needles of two adjacent gun heads 5 is between 8 and 18mm, and further, the distance L between the glue outlets or the valve needles of two adjacent gun heads 5 is between 11 and 15 mm.

The valve needle 20 is of an integrally formed structure. The number of the valve needles 20 is more than 2, and the valve needles may be arranged in a single-row array as shown in fig. 1, fig. 2, and fig. 7, or in a multi-row array. In the embodiment with a plurality of rows of valve needles 20, two adjacent rows of valve needles 20 may be aligned or staggered.

In the present embodiment, the number of the valve needles 20 is more than 3 and less than 10, so as to facilitate the arrangement of the glue solution flow channels 15, and meanwhile, the valve needles 20 are arranged in a single row array. Set up a plurality of needle 20 sets up at same main part 4 collectively, reduce 5 intervals of rifle head, be convenient for dock with the less work piece of product injecting glue point overall arrangement requirement, need not to set up the cold runner and carry out the transition, reduce the production of mouth of a river material, and then reduce extravagantly.

The main body 4 is a gun body, which is an integrally formed structure, and may be formed by casting, drawing, or the like. In this embodiment, the main body 4 is an integrally formed structure, and the plurality of valve cavities and the glue flow channels 15 are disposed on the main body 4. The main body 4 is also provided with a heat insulation assembly, the heat insulation assembly comprises a heating rod or a heating pipe arranged on the main body 4 and a temperature sensor, and the valve cavity and the glue solution of the glue solution flow passage 15 are kept at a preset temperature through the heating main body 4 so as to smoothly inject glue. One side of the main body 4 is provided with a wire harness head 6 electrically connected with a heating rod or a heating pipe 10 and a temperature sensor.

A sealing structure 25 is provided in the valve chamber between the valve needle 20 and the main body 4. The upper end of the needle 20 extends out of the body 4 to connect with the needle adjustment assembly. The upper end of the valve needle 20 is provided with a T-head 21. The lower end of the valve needle 20 seals the glue outlet at the gun sealing position. The sealing structure 25 is located above the glue flow channel 15. The sealing structure 25 comprises a valve needle sleeve plug 17 and a valve needle sleeve 18. The valve needle sleeve 18 and the valve needle sleeve plug 17 are sleeved between the valve needle 20 and the main body 4 (valve cavity wall), a first sealing ring 22 is arranged between the valve needle sleeve 18 and the valve needle 20, and a second sealing ring 19 is arranged between the valve needle sleeve 18 and the main body 4, so that the valve needle 20 and the main body 4 are sealed. The first 22 and second 19 seals are O-rings. The valve needle sleeve plug 17 is fixedly connected in the valve cavity through threads and limits the valve needle sleeve 18 below. And a limit step is also arranged in the valve cavity. The valve needle sleeve 18 is positioned between the valve needle sleeve plug 17 and the stop step. A spacer 23 is also provided below the seal 25. The cushion block 23 is located between the limit step and the needle sleeve 18 to support and limit the needle sleeve 18.

The valve needles 20 are driven by the same driving assembly to move synchronously, and simultaneously block the gun head 5. The drive assembly comprises at least one cylinder 1. In the present embodiment, the driving assembly includes a single cylinder, a cylinder fixing plate 2 is fixedly connected to an upper end of the main body 4, and the needle 20 is located below the cylinder fixing plate 2. The cylinder 1 is fixedly connected to a cylinder fixing plate 2. Specifically, the cylinder fixing plate 2 is fixedly connected with a plurality of guide posts 13, and is fixedly connected with the main body 4 through the guide posts 13. The cylinder 1 has a piston rod. The piston rod is fixedly connected with a push plate (the push plate is a valve needle cover plate 9). The push plate can synchronously drive the valve needles 20 to move up and down along the axial direction. The cylinder fixing plate 2 is a rectangular plate structure, and four guide pillars 13 are distributed at four corner positions of the cylinder fixing plate 2. The cylinder fixing plate 2 is provided with a through hole, and a piston rod penetrates through the through hole to be connected with a valve needle adjusting assembly below the piston rod.

In an embodiment such as a multi-row valve needle embodiment, the driving assembly includes a plurality of air cylinders to provide more driving force to ensure smooth opening and closing of the glue injection, and the plurality of air cylinders can act on all the valve needles simultaneously and can drive different valve needles respectively. For example: in the case of 4 rows of valve needles, two cylinders drive 2 rows of valve needles separately.

In this embodiment, the driving assembly is further connected to a controller, and the controller controls the driving assembly to drive the valve needle 20 to be located at the gun sealing position for a predetermined time period to control the glue injection effect. And the preset time length is greater than the rated glue injection time length. The rated glue injection time is the cavity volume divided by the single gun head glue injection speed. And stopping injecting glue when the pressure in the cavity is equal to the glue injection pressure after the cavity is filled with the glue solution.

The upper end of the valve needle 20 is connected with a valve needle adjusting component. The needle adjustment assembly is operable to provide axial position adjustment of each valve needle 20. Each valve needle 20 is independently operable to adjust its axial position by the valve needle adjustment assembly. The multi-point glue injection gun drives the valve needle 20 to move synchronously by means of the valve needle adjusting assembly. The valve needle adjusting assembly is driven by the force applied by the piston rod and driven by the cylinder 1 to linearly reciprocate. The upper ends of the plurality of valve needles 20 are connected to and adjustably positionable by the valve needle adjustment assembly in axial position connection with the valve needle adjustment assembly.

The axial position of the target valve needle 20 is adjusted through the valve needle adjusting assembly, and then each valve needle 20 is positioned at a desired gun sealing position (such as the gun sealing position shown in fig. 7) before use, so that leakage caused by the fact that a certain valve needle 20 does not completely seal a glue outlet at the gun sealing position is avoided, glue injection accuracy is guaranteed, and safety problems caused by material leakage are avoided.

Compared with the method that a plurality of independent single-gun-head glue injection guns are used for carrying out array arrangement and glue injection simultaneously, the distance between two adjacent gun heads is more than 25mm, so that the gun heads are difficult to apply to workpieces with glue injection points with small distances, and even if the gun heads are applied, a large number of cold runners need to be arranged, so that a water gap is large, and material waste is serious. The multi-point glue injection gun of the embodiment can reduce the distance between the glue outlets of the adjacent gun heads 5 to be less than 20mm, even less than 15mm, has an obvious effect of reducing material waste compared with an independent single-gun head glue injection gun, can reduce the material waste by more than 80% in actual measurement, and takes 100 tons of the waste of the existing independent single-gun head glue injection gun as an example, and the waste of the multi-point glue injection gun of the embodiment is less than 20 tons.

In addition, there is machining error valve needle 20 to each part has assembly tolerance or error, and then has the problem that rifle head 5 can't completely seal the rifle after assembling a plurality of valve needles 20 of concentrating on a main part 4, borrows to regulate and control each valve needle 20 independently by the valve needle adjusting part, makes it can be sealed rifle head 5 in the rifle position, guarantees to seal gluey effect.

Can guarantee through needle adjusting part that needle 20 will go out the jiao kou shutoff at the gun position to fix the location with needle 20, follow needle adjusting part simultaneous movement, and then each needle 20's removal range is unanimous. And, the condition that the needle 20 easily produces wearing and tearing after the injecting glue rifle is used for a long time, continues to adjust the position of needle 20 through needle adjusting part, plugs the needle 20 with the play jiao kou of rifle head 5 again, need not to change new injecting glue rifle, can prolong the life of injecting glue rifle by a wide margin.

In order to allow the valve needle 20 to be returned to the open position upon depression, the valve needle adjustment assembly is provided with a return member. The reset element applies a biasing force to the valve needle 20 moving towards the open position. When the cylinder 1 drives the valve needle adjusting assembly to move upwards, the resetting piece pushes the valve needle 20 to move upwards synchronously along with the valve needle adjusting assembly until the valve needle adjusting assembly reaches an opening position (which can be regarded as an initial position).

Specifically, the return spring 16 is sleeved outside the valve needle 20 and pushes the valve needle 20 upwards; the upper end of the valve needle 20 is provided with a reset ring platform; the upper end of the reset spring 16 props against the reset ring platform, and the lower end props against the valve needle plate 7. When the valve needle needs to move downwards towards the gun sealing position, the cylinder 1 pushes the adjusting component body consisting of the valve needle cover plate 9, the valve needle plate 7 and the adjusting plate 8 which are fixedly connected to move, and the adjusting rod 12 in the adjusting component body presses the valve needle 20 downwards by means of the cooperation of the first matching part and the second matching part to move together with the valve needle 20.

In this embodiment, the needle adjusting assembly is slidably sleeved on the guide post 13. The needle adjustment assembly is arranged to move axially between the cylinder fixing plate 2 and the main body 4. Specifically, the valve needle adjusting assembly comprises a valve needle cover plate 9, a valve needle plate 7 and an adjusting plate 8. The valve needle cover plate 9, the valve needle plate 7 and the adjusting plate 8 are fixedly connected in sequence along the axial direction. The valve needle cover plate 9, the valve needle plate 7 and the adjusting plate 8 are arranged in a stacked mode. The guide post 13 passes through the valve needle cover plate 9, the valve needle plate 7 and the adjusting plate 8. A guide sleeve 14 is arranged between the valve needle cover plate 9, the adjusting plate 8 and the guide post 13. A gap is formed between the adjusting plate 8 and the guide post 13.

A plurality of valve needles 20 are arranged on a side of the valve needle cover plate 9 facing away from the drive assembly to be synchronously driven by the valve needle cover plate 9. The driving component and the valve needles 20 are respectively positioned at two sides of the valve needle cover plate 9. The valve needle cover plate 9, the valve needle plate 7 and the adjusting plate 8 are arranged in a stacked mode. Two adjacent valve needle cover plates 9, two adjacent valve needle plates 7 and two adjacent adjusting plates 8 are in plane contact, so that the flatness is guaranteed, and the action consistency of each valve needle 20 is further guaranteed.

The valve needle adjustment assembly can independently adjust the axial position of each valve needle 20, and the axial position of the valve needle 20 can be adjusted up and down as desired whether the valve needle 20 is in the open position or the gun sealing position. The valve pin adjustment assembly includes a plurality of adjustment rods 12 operable to move in a transverse direction perpendicular to the axial direction. The adjustment rod 12 extends in a transverse direction perpendicular to the valve needle 20. The adjusting rods 12 are arranged corresponding to the valve needles 20 one by one, and the valve needles 20 can be adjusted and controlled in one-to-one correspondence.

For example, when the valve needle 20 is at the open position, the position of the corresponding valve needle 20 is adjusted by adjusting the adjusting rod 12, and then the valve needle is driven to the gun sealing position to verify the sealing performance; correspondingly, when the gun is in the gun sealing position, the gun head 5 is determined not to be sealed through a sealing test (for example, whether liquid leaks or not), and then the corresponding valve needle 20 is adjusted to seal the gun head 5.

The valve needle plate 7 has a plurality of first mounting holes 71 penetrating therethrough in the axial direction. The lower end of the first mounting hole 71 is provided with a fixed step 72; the return spring 16 is captured between the retention step 72 and the return land (shown in fig. 3 and not labeled). To prevent the needle 20 from rotating, the needle plate 7 is further provided with an anti-rotation groove 73 that opens into the first mounting hole 71. The upper end of the valve needle 20 is also fixedly connected with an anti-rotation rod 209, the anti-rotation rod 209 is vertically connected with the valve needle 20 and is placed in the anti-rotation groove 73 to limit the circumferential rotation of the valve needle 20, so that the valve needle can only move along the axial direction.

The regulating plate 8 has a plurality of second mounting holes through which the valve needles 20 pass. The second mounting holes of the adjusting plate 8 and the first mounting holes 71 of the valve needle plate 7 are communicated in one-to-one alignment for the valve needles 20 to pass through. The needle adjustment assembly has a mounting bore for mounting the needle 20. The fitting holes include a first mounting hole 71 through which the valve pin plate 7 passes, and a second mounting hole through which the adjustment plate 8 passes. The guide passage 95 vertically communicates with the fitting hole.

The adjustment plate 8 is provided with a guide channel 95. The guide passage 95 extends in a lateral direction perpendicular to the axial direction. The surface of the adjusting plate 8 facing the valve needle plate 7 is a plane, the surface of the valve needle plate 7 facing the adjusting plate 8 is a plane, and the two surfaces are in laminated contact, so that the installation flatness is ensured, and further, the axial synchronous movement precision of the valve needles 20 is ensured when the valve needles are driven along the axial direction. The adjustment plate 8 is provided with a plurality of adjustment grooves 81 opening upward. The adjustment groove 81 is a rectangular groove and penetrates the adjustment plate 8 in the lateral direction. The valve needle plate 7 covers the adjusting plate 8, and the adjusting groove covers the adjusting groove to form a guide channel 95. The cross section of the guide channel 95 is a polygonal structure, and accordingly, the cross section of the adjustment rod 12 matches the cross section of the guide channel 95, and is also a polygonal structure, so as to avoid an undesired rotational displacement of the adjustment rod 12 in the guide channel 95.

The adjustment plate 8 is further provided with a viewing aperture 810. The viewing aperture 810 opens into the guide channel 95; the plurality of observation holes 810 are in one-to-one correspondence with the plurality of guide passages 95. Specifically, the guide passage 95 forms a viewing hole 810 on one side of the adjustment assembly body, and the fitting condition of the first and second fitting portions can be viewed through the viewing hole 810, so as to adjust the axial position of the valve needle 20.

As shown in fig. 8, the needle adjustment assembly is further provided with an adjustment screw 115. The adjusting plate 8 is provided with a baffle 89 at one end along the guide passage 95. The adjusting plate 8 is provided at the end with a baffle plate installation groove 82 to fixedly install the baffle plate 89 perpendicular to the adjusting groove 81. The baffle 89 is provided with a blocking hole 11 corresponding to each guide channel 95, the rear end of the adjusting rod 12 is provided with a thread groove, and the adjusting screw 115 is in threaded connection with the adjusting rod 12, is inserted into the thread groove in a threaded connection manner and is fixedly connected with the adjusting rod 12. The adjusting screw 115 passes through the blocking hole 11, the front end is in threaded connection with the adjusting rod 12, and the nut of the adjusting screw 115 is blocked outside the blocking hole 11. By turning the adjusting screw 115, the length of the adjusting screw 115 screwed into the thread groove is adjusted and controlled, so that the transverse movement of the adjusting rod 12 is realized, and thereby the axial position adjustment (height adjustment) of the valve needle is realized. The adjusting rod 12 is of a polygonal structure, is limited in a guide channel of the polygonal structure and cannot rotate along with the adjusting screw 115, and therefore the adjusting rod and the adjusting screw can rotate relatively.

In order to fix the position of the adjusting screw 115 relatively and push the adjusting lever 12 to move forward and backward smoothly in the transverse direction, an elastic member 129 for applying a biasing force (elastic force) to the adjusting lever 12 is provided between the stopper 89 and the adjusting lever 12. The resilient member 129 applies a biasing force to the adjustment rod 12 away from the adjustment screw 115 (towards the valve needle). Specifically, the elastic element 129 comprises a spring sleeved outside the adjusting screw 115, which pushes the adjusting rod 12 forward to move toward the valve needle, so as to prevent the adjusting screw 115 from moving backward, thereby positioning the axial position of the valve needle more stably. For example, the adjusting screw 115 pushes the adjusting rod 12 to move forward, which presses the valve needle 20 downward, so that the valve needle 20 moves downward. When the adjusting screw 115 is screwed outward, the adjusting rod 12 moves backward following the adjusting screw 115, so that the valve needle 20 moves upward and returns.

In another possible embodiment, the baffle 89 itself is provided with a threaded adjustment hole through which it extends, and an adjustment screw is screwed into the threaded adjustment hole and must abut against the adjustment rod 12, and by turning the adjustment screw, the adjustment screw is moved along the length direction (transverse direction) of the adjustment rod 12, thereby adjusting the transverse position of the adjustment rod 12. For example, the adjusting screw pushes the adjusting rod 12 to move inward, which presses the valve needle 20 downward, so that the valve needle 20 moves downward. When the adjusting screw is screwed outwards, the valve needle 20 pushes the adjusting rod 12 outwards to move along with the adjusting screw under the action of the return spring 16 through a first matching part and a second matching part, so that the valve needle 20 moves upwards and returns.

In the present embodiment, to achieve an adjustable axial position of the valve needle 20, the adjusting lever 12 is provided with a first mating portion. The needle 20 is provided with a second engagement portion below the spring 16. The first and second cooperating portions cooperate to convert the lateral linear movement of the adjustment rod 12 into an axial linear movement of the valve needle 20. In this embodiment, at least one of the first and second engaging portions is a slope. As shown in fig. 2 and 3, the end of the adjustment rod 12 close to the needle 20 is a front end, the end far from the needle 20 is a rear end, the first engaging portion is a first inclined surface 125 provided at the front end of the adjustment rod 12, and the second inclined surface 261 is a lower surface of the side groove 26.

The adjustment rod 12 is operable to move in a lateral direction. The height position (axial position) of the adjustment rod 12 is not changed but moves only in the lateral direction with respect to the needle adjustment assembly. The adjusting rod 12 adjusts the axial position of the valve needle 20 by moving along the transverse direction, wherein at least one of the first matching portion and the second matching portion is an inclined surface, and the first matching portion is located above the second matching portion. The adjustment rod 12 presses down the needle 20 and in cooperation with the spring 16 fixes the position of the needle 20. Through the cooperation of the second cooperation part and the first cooperation part in different positions.

In order to avoid the situation that the adjusting rod 12 is blocked in the process of moving transversely, the first matching part and the second matching part are both in inclined surface structures. Also, the first inclined surface 125 and the second inclined surface 261 are both flat surfaces. The first inclined surface 125 and the second inclined surface 261 have the same inclination for better fitting and smoother movement when relative movement occurs, avoiding obstruction. Of course, the slope of the first inclined surface 125 may be greater than that of the second inclined surface 261. In addition, to avoid the occurrence of blockage, the mating surface of the second mating portion may also be a cambered surface structure such as a spherical surface. Of course, the matching surface of the first matching part is not limited to the inclined surface, and may also be an arc surface, and only the matching surface is required to be smoothly increased from back to front.

The valve needle 20 has a throat. The narrow portions form lateral grooves 26 on the valve needle 20 distributed on both sides. The mating end of the adjustment lever 12 forms a prong structure 120 and is inserted into the side groove 26. The prong structure 120 includes a left prong 120a and a right prong 120b. The lower sides of the left and right prongs 120a, 120b are each provided with a first inclined surface 125. The lower sides of the left and right side grooves 26 of the narrow portion are provided with second inclined surfaces 261.

Bearing in mind the above description, by providing the rotation preventing bar 209 and the rotation preventing groove 73, the needle 20 is prevented from rotating during assembly, which facilitates positioning of the needle 20, so that the jaw structure 120 of the adjusting bar 12 is engaged with the narrow portion of the needle 20, thereby facilitating the abutting of the first and second engaging portions. Of course, the upper side surface of the side groove 26 can be driven by the fork head structure 120 when moving upwards, so as to be reset to the opening position, open the glue injection gun, further match with the return spring 16, reduce the reset bias effect of the return spring 16 and prolong the service life.

Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified elements, components, parts or steps as well as other elements, components, parts or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims

1. A multi-point glue injection gun comprising: a main body; a drive assembly; a valve needle adjustment assembly;

the valve needle adjusting assembly is connected with a plurality of valve needles and can be used for operatively adjusting the axial position of each valve needle; the driving assembly can drive the valve needle to move to a gun sealing position for sealing the gun head glue outlet along the axial direction from an opening position for opening the gun head glue outlet.

2. The multipoint glue injection gun according to claim 1, wherein the valve needle adjusting assembly comprises a plurality of adjusting rods corresponding to the valve needles one to one; the adjusting rod can be operated to move along a transverse direction perpendicular to the axial direction; the adjusting rod is provided with a first matching part, and the valve needle is provided with a second matching part; the transverse movement of the adjusting rod forms an axial movement of the valve needle by means of the cooperation of the first and second cooperating portions.

3. The glue gun as claimed in claim 2, wherein at least one of the first and second mating portions is provided with a chamfer.

4. The multipoint glue injection gun according to claim 3, wherein the first matching portion is a first inclined surface, and the second matching portion is a second inclined surface located on one side of the first inclined surface, which is close to the gun head; the first inclined plane and the second inclined plane are both planes.

5. The multi-shot glue injection gun of claim 4, wherein the valve needle has a throat; the narrow part forms side grooves distributed on two sides of the valve needle; one end of the adjusting rod is provided with a left fork head and a right fork head which are respectively inserted into the side grooves on the two sides; the first inclined plane is arranged on one side, close to the gun head, of the left fork head and the right fork head; and a second inclined plane is arranged on the side surface of the side groove, which is close to the gun head.

6. The multipoint glue injection gun according to claim 1, wherein the valve pin adjustment assembly fixes the relative position of the valve pin and the valve pin in an axially adjustable manner.

7. The multipoint glue injection gun as claimed in claim 2, wherein the valve pin adjustment assembly is provided with a reset member that applies a biasing force to the valve pin to move toward the open position; the first engaging portion applies a force to the second engaging portion in a direction opposite to the biasing force.

8. The multipoint glue injection gun according to claim 7, wherein the return element includes a return spring sleeved outside the valve needle; one end of the return spring, which is close to the gun head, is fixed on the valve needle adjusting assembly, and one end of the return spring, which is far away from the gun head, abuts against the valve needle; the first matching part is positioned on one side of the second matching part, which is far away from the gun head.

9. The multi-shot glue injection gun of claim 8, wherein the valve pin adjustment assembly is provided with a plurality of guide channels extending in a transverse direction; the adjusting rods are accommodated in the guide channels in a one-to-one correspondence manner and can move transversely; the valve needles penetrate through the guide channels in a one-to-one correspondence manner; the valve needle adjusting assembly is also provided with a rotatable adjusting screw at one end of the adjusting rod far away from the valve needle, wherein the fixed position of the adjusting screw is fixed on the adjusting rod; one end of the adjusting screw is an operating end, and the other end of the adjusting screw is in threaded connection with the adjusting rod.

10. The multi-shot glue injection gun of claim 9, wherein the needle adjustment assembly is axially movably disposed between the drive assembly and the main body; the valve needle adjusting assembly comprises a valve needle cover plate, a valve needle plate and an adjusting plate which are fixedly connected in a stacked mode; the valve needles are positioned on one side of the valve needle cover plate far away from the driving assembly, and penetrate through the valve needle plate and the adjusting plate; the valve needle cover plate is connected with the driving component and is driven by the driving component;

the valve needle plate is provided with a plurality of first mounting holes which penetrate through the valve needle plate along the axial direction; the adjusting plate is provided with a plurality of second mounting holes which penetrate through the adjusting plate along the axial direction; the second mounting holes are communicated with the first mounting holes in a one-to-one alignment mode and are penetrated by the valve needle; the upper end of the valve needle is provided with a reset ring platform; a fixed step is arranged in the first mounting hole; the reset spring is limited between the reset ring platform and the fixed step; the upper end of the valve needle is fixedly connected with an anti-rotation rod vertical to the valve needle; the valve needle plate is also provided with an anti-rotation groove communicated with the first mounting hole; the anti-rotation rod is accommodated in the anti-rotation groove; the guide channel forms an observation hole at one side of the valve needle adjusting component back to the adjusting screw; the cross section of the guide channel is matched with the cross section of the adjusting rod.

11. The multi-point glue injection gun according to claim 10, wherein a baffle is further fixedly mounted at one end of the adjusting plate; the baffle plate is provided with a baffle hole for the adjusting screw to pass through; an elastic piece for applying biasing force to the adjusting rod is arranged between the baffle and the adjusting rod.

12. The glue injection gun according to claim 1, wherein the distance between two adjacent valve pins is less than 20 mm.

13. The multi-shot glue injection gun of claim 1, wherein the body is of an integrally formed structure; the valve needle is of an integrally formed structure; the plurality of valve cavities are arranged in parallel into at least one row.

14. The multi-shot glue injection gun of claim 1, wherein the drive assembly includes at least one air cylinder; each cylinder correspondingly drives more than two valve needles.

15. The multipoint glue injection gun according to claim 1, wherein one end of the valve cavity is fixedly connected with a gun head with a glue outlet; or the multipoint glue injection gun is detachably butted with the mould and is provided with a gun head with a glue outlet.

16. The multi-point glue injection gun according to claim 15, wherein the gun head is integrally formed with the main body; the glue outlet is formed in one end of the main body.