Dispensing valve and dispensing device

Abstract

The embodiment of the present application provides a dispensing valve and a dispensing device, wherein the dispensing valve can realize dispensing packaging of LEDs on one side, and can make glue in a glue storage cylinder flow in circulation through cooperation of a circulation cavity, a circulation glue extruding rod and a circulation glue pumping channel and a circulation backflow channel, so that precipitation of the glue in the glue storage cylinder due to long time static state is avoided, and uniform proportioning can be maintained for a long time, which is beneficial to improving quality and qualification rate of LED products, and the glue in the glue storage cylinder can be used up by the dispensing device because the glue is always proportioned uniformly, effective use rate of the glue is improved, material waste is reduced, and glue raw material cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of dispensing technology, and more particularly to a dispensing valve and dispensing device. Background Technology

[0002] In the LED manufacturing process, phosphor needs to be evenly dispersed in encapsulating adhesive at a certain ratio, and then the phosphor adhesive is applied to the LED cup using a dispensing device. However, the prepared phosphor adhesive will experience sedimentation over time, resulting in inconsistent light emission colors or excessive dispersion in the same batch of LED products, affecting the product qualification rate. Summary of the Invention

[0003] The dispensing valve and dispensing device provided in this invention mainly solve the technical problem of how to avoid precipitation of the prepared fluorescent adhesive, which affects the quality of LED products.

[0004] To address the aforementioned technical problems, this invention provides a dispensing valve, comprising a valve body, a valve core, and an extrusion rod. The valve body has a glue storage cylinder interface, the first end of which is connected to a glue storage cylinder for storing glue. The valve body also includes a valve core placement cavity and a glue cavity, the glue cavity comprising a circulation cavity. The extrusion rod includes a circulation extrusion rod that matches the circulation cavity, moving along the axis of the circulation cavity to change the air pressure within it. The valve core is disposed within the valve core placement cavity and is movable relative to it. The valve core has a circulating glue extraction channel and a circulating return channel, each channel being configured to either be connected or closed depending on the relative position of the valve core and the valve core placement cavity.

[0005] During the glue extraction stage in the circulation chamber, the glue extraction channel connects the second end of the glue storage cylinder interface with the circulation chamber, allowing the glue in the glue storage cylinder to enter the circulation chamber through the glue extraction channel; during the glue extrusion stage in the circulation chamber, the return channel connects the circulation chamber with the glue storage cylinder, allowing the glue in the circulation chamber to enter the glue storage cylinder.

[0006] Optionally, the valve body includes an upper valve body and a valve core sleeve, with the rubber cavity disposed in the upper valve body and the valve core mounting cavity disposed in the valve core sleeve, and the valve core sleeve and the upper valve body being detachably connected.

[0007] Optionally, the valve core may translate relative to the valve core mounting cavity along its axial direction; or, the valve core may rotate relative to the valve body body about its axis.

[0008] Optionally, the valve body is also provided with a needle interface, the first end of which is used to connect with a dispensing needle; the glue chamber also includes an injection chamber, and the extrusion rod includes an injection extrusion rod that matches the injection chamber. The injection extrusion rod moves along the axis of the injection chamber to change the air pressure in the circulation chamber; the valve core is also provided with a working glue extraction channel and a working glue extrusion channel, which are interconnected with the circulation glue extraction channel;

[0009] During the glue extraction stage of the glue injection chamber, the working glue extraction channel connects the second end of the glue storage cylinder to the glue injection chamber, so that the glue in the glue storage cylinder can enter the glue injection chamber through the working glue extraction channel; during the glue extrusion stage of the glue injection chamber, the working glue extrusion channel connects the second end of the glue dispensing needle to the glue injection chamber, so that the glue in the glue injection chamber can enter the glue dispensing needle through the working glue extrusion channel and be extruded from the glue dispensing needle.

[0010] Optionally, the working glue extraction channel and the circulating glue extraction channel are arranged on the surface of the valve core along the axis of the valve core.

[0011] Optionally, the working extrusion channel extends through the valve core in a direction perpendicular to the valve core's axis.

[0012] Optionally, an elastic sealing ring is fixedly provided at the end of the glue cavity away from the valve core, and / or, an elastic sealing ring is fixedly provided at the inner end of the glue extrusion rod, the inner end of which is the end of the glue extrusion rod that extends into the glue cavity; the elastic sealing ring is used to seal the gap between the glue extrusion rod and the glue cavity in the radial direction of the glue cavity.

[0013] Optionally, the valve body is also provided with a return pipe interface. One end of the return pipe interface is used to connect with the outlet of the return channel during the extrusion stage of the circulation chamber, and the other end is used to connect with the inlet of the return pipe. The outlet of the return pipe is used to communicate with the return hole provided on the side wall of the storage cylinder.

[0014] Optionally, the recirculation channel extends through the valve core in a direction perpendicular to its axis, or the recirculation channel is shaped like a "7" in the cross-section of the valve core, or the recirculation channel is disposed on the surface of the valve core.

[0015] This invention also provides a dispensing device, which includes a power unit, a glue reservoir, a dispensing needle, and a dispensing valve as described above. The glue reservoir is connected to the first end of the glue reservoir interface on the dispensing valve, and the dispensing needle is connected to the first end of the needle interface on the dispensing valve. The power unit includes a glue rod power unit and a valve core power unit. The glue rod power unit is used to drive the glue extrusion rod to move along the axis of the glue cavity, and the valve core power unit is used to drive the valve core to move relative to the valve core placement cavity.

[0016] Optionally, the valve body of the dispensing valve is provided with a return pipe interface. One end of the return pipe interface is used to connect with the outlet of the circulating return channel during the dispensing stage of the circulating chamber, and the other end is used to connect with the inlet of the return pipe. The outlet of the return pipe is located on the upper side wall of the glue storage cylinder.

[0017] Optionally, the valve body is provided with a needle interface, the first end of which is used to connect to a dispensing needle; the glue chamber also includes an injection chamber, and the extrusion rod includes an injection extrusion rod that matches the injection chamber. The injection extrusion rod moves along the axis of the injection chamber to change the air pressure in the circulation chamber; the glue rod power unit drives the circulation extrusion rod and the injection extrusion rod synchronously.

[0018] The beneficial effects of this invention are:

[0019] The dispensing valve and dispensing device including the dispensing valve provided in this invention have a circulation chamber on the valve body cup and a circulation suction channel and a circulation return channel on the valve core that cooperate with the circulation chamber. When the circulation extrusion rod is pulled, the air pressure in the circulation chamber decreases, allowing the adhesive in the storage tank to enter the circulation chamber through the circulation suction channel. When the circulation extrusion rod is pushed, the air pressure in the circulation chamber increases, allowing the adhesive in the circulation chamber to flow back into the storage tank through the circulation return channel. In this way, the dispensing valve can achieve dispensing and encapsulation of LEDs, and the cooperation of the circulation chamber, circulation extrusion rod, circulation suction channel, and circulation return channel allows the adhesive in the storage tank to circulate, thus preventing sedimentation due to prolonged stagnation and maintaining a uniform ratio for a long time. This not only improves the quality and pass rate of LED products, but also ensures that the adhesive in the storage tank is always uniformly mixed, allowing it to be used up by the dispensing device, improving the effective utilization rate of the adhesive, reducing material waste, and lowering the cost of adhesive raw materials.

[0020] Other features and corresponding beneficial effects of the present invention will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in the specification. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a dispensing valve provided in Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of a valve body provided in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the extrusion rod provided in Embodiment 1 of the present invention;

[0024] Figure 4aThis is a schematic diagram of the fit between the extrusion rod, the glue cavity, and the elastic sealing ring provided in Embodiment 1 of the present invention;

[0025] Figure 4b This is another schematic diagram showing the cooperation between the extrusion rod, the glue cavity, and the elastic sealing ring provided in Embodiment 1 of the present invention;

[0026] Figure 5 This is a schematic diagram of a valve core that switches by rotation, as provided in Embodiment 1 of the present invention.

[0027] Figure 6a This is a schematic diagram of the valve body provided in Embodiment 1 of the present invention from a certain viewing angle;

[0028] Figure 6b This is a schematic diagram of the valve body provided in Embodiment 1 of the present invention from another viewing angle;

[0029] Figure 7 This is a schematic diagram of another structure of the valve core that switches by rotation, as provided in Embodiment 1 of the present invention;

[0030] Figure 8 This is a schematic diagram of a valve core that switches by translation, as provided in Embodiment 1 of the present invention.

[0031] Figure 9 This is a schematic diagram of a dispensing device provided in Embodiment 2 of the present invention;

[0032] Figure 10 This is a schematic diagram of the dispensing device provided in Embodiment 3 of the present invention from one viewing angle;

[0033] Figure 11 This is a schematic diagram of the dispensing device provided in Embodiment 3 of the present invention from another viewing angle.

[0034] 1-Dispensing valve; 10-Valve body; 111-Injection chamber; 112-Circulation chamber; 113-Valve core mounting chamber; 121-Needle interface; 122-Reservoir interface; 123-Return interface; 20-Valve core; 211-Working glue extraction channel; 212-Working glue extrusion channel; 221-Circulation glue extraction channel; 222-Circulation return channel; 30-Extrusion rod; 31-Injection extrusion rod; 32-Circulation extrusion rod; 9-Dispensing device; 91-Reservoir; 92-Dispensing needle; 93-Return tube; 100-Dispensing device ; 40-Dispensing valve; 411-Valve body cover; 411a-Degassing hole; 411b-Collection tank; 412-Valve body; 412a-Injection chamber; 412b-Circulation chamber; 413-Valve core sleeve; 4130-Valve core mounting chamber; 413a-Needle interface; 413b-Glue reservoir interface; 413c-Return interface; 42-Valve core; 431-Injection extrusion rod; 432-Circulation extrusion rod; 50-Dispensing needle; 60-Glue reservoir; 70-Return pipe; R1-Cavity elastic sealing ring; R2-Rod elastic sealing ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] Example 1:

[0037] Since white LEDs are obtained by setting a light conversion layer on blue or green LEDs, the manufacturing process typically involves mixing phosphor in a specific ratio into an encapsulating adhesive and stirring thoroughly to obtain a phosphor adhesive. This phosphor adhesive is then applied to the LED cup, covering the blue or green LED to convert the emitted light into white light. In some cases, quantum dot materials can be used instead of phosphor, and mixed uniformly with the encapsulating adhesive to obtain a quantum dot adhesive.

[0038] However, regardless of whether phosphors or quantum dot materials are used to form the encapsulation adhesive, sediment will form within the adhesive over time, affecting the quality and yield of LED products. To address this, this embodiment first provides a dispensing valve; please refer to [link to relevant documentation]. Figure 1 The schematic diagram of the dispensing valve shown is as follows: The dispensing valve 1 includes a valve body 10, a valve core 20, and an extrusion rod 30.

[0039] The valve body cup also contains a valve core mounting cavity and a glue cavity, the glue cavity including a circulation cavity; the glue extrusion rod includes a circulation extrusion rod that matches the circulation cavity, the circulation extrusion rod moves along the axis of the circulation cavity to change the air pressure in the circulation cavity.

[0040] Please combine Figure 2 The schematic diagram of the valve body 10 shown illustrates the structure of the valve body 10. The valve body 10 is equipped with a glue storage cylinder interface 122. The first end of the glue storage cylinder interface 122 is used to connect to a glue storage cylinder, which is used to store the prepared glue. In this embodiment, the glue stored in the glue storage cylinder can be prepared from encapsulating adhesive and phosphor, or from encapsulating adhesive and quantum dot materials. Simultaneously, the valve body 10 also includes a glue cavity and a valve core mounting cavity 113. The valve core mounting cavity 113 is used to install the valve core 20, and the glue cavity is used to temporarily store the glue extracted from the glue storage cylinder. The glue cavity includes a circulation cavity 112. The extrusion rod 30 includes a circulation extrusion rod 32 that matches the circulation cavity 112. The circulation extrusion rod 32 can move along the axis of the circulation cavity 112 to change the air pressure within the circulation cavity 112, thereby causing the glue to be drawn into or extruded from the circulation cavity 112.

[0041] It is understood that the dispensing valve 1 has a dispensing function. Therefore, in this embodiment, the dispensing valve 1 includes not only a structure for realizing glue circulation, but also a structure for dispensing glue. Please continue to refer to... Figure 1 and Figure 2 :

[0042] The glue chamber includes a dispensing chamber 111 and a circulation chamber 112. The dispensing chamber 111 stores the glue that will be injected into the encapsulated object (e.g., the cup / bowl corresponding to an LED chip) through the dispensing needle; while the circulation chamber 112 stores the glue that will be returned to the glue reservoir. It is understood that a dispensing valve 1 may include only one dispensing chamber 111 and one circulation chamber 112, as... Figure 1 As shown. However, in some other examples of this embodiment, a dispensing valve 1 may also be provided with at least two dispensing chambers 111, and / or at least two circulation chambers 112.

[0043] The valve body 10 is also provided with a needle interface 121 and a glue reservoir interface 122. The first end of the needle interface 121 is used to connect to a dispensing needle, and the first end of the glue reservoir interface 122 is used to connect to a glue reservoir. The dispensing needle can dispense the glue in the dispensing cavity 111 onto the target object, while the glue reservoir is used to store the prepared glue. In this embodiment, the glue stored in the glue reservoir can be prepared by mixing encapsulating adhesive and phosphor, or by mixing encapsulating adhesive and quantum dot material.

[0044] like Figure 3As shown, the extrusion rod 30 is of two types: one type is the injection extrusion rod 31, and the other is the circulating extrusion rod 32. The injection extrusion rod 31 is used to cooperate with the injection cavity 111, and the two together form a piston mechanism: the injection extrusion rod 31 moves within the injection cavity 111 along the axis of the injection cavity 111, for example... Figure 1 In this process, the glue-dispensing extrusion rod 31 moves up and down within the glue-dispensing chamber 111, thereby changing the air pressure within the glue-dispensing chamber 111. This causes the glue to be drawn from the glue reservoir into the glue-dispensing chamber 111, or to be squeezed from the glue-dispensing chamber 111 into the dispensing needle. The circulating extrusion rod 32 cooperates with the circulating chamber 112, and the two together form a piston mechanism: the circulating extrusion rod 32 moves within the circulating chamber 112 along the axis of the circulating chamber 112, for example... Figure 1 In this process, the circulating extrusion rod 32 moves up and down within the circulating chamber 112, thereby changing the air pressure within the circulating chamber 112. This causes the glue to be drawn from the glue storage cylinder into the circulating chamber 112, or to be extruded from the circulating chamber 112 into the glue storage cylinder. It is understood that the structures of the glue injection extrusion rod 31 and the circulating extrusion rod 32 can be the same or different. For example, if the structures of the glue injection chamber 111 and the circulating chamber 112 are the same, then the structures of the glue injection extrusion rod 31 and the circulating extrusion rod 32 can also be the same.

[0045] It is understood that, in order to ensure a tight fit between the extrusion rod 30 and the glue cavity to form a piston mechanism, at least one side of the extrusion rod 30 should have no gap with the inner wall of the glue cavity. For example, at least one part of the extrusion rod 30 and the glue cavity should be in an interference fit state. Therefore, in some examples of this embodiment, an elastic sealing ring can be provided between the extrusion rod 30 and the glue cavity, so that the elastic sealing ring seals the gap between the extrusion rod 30 and the glue cavity in the radial direction of the glue cavity.

[0046] In some examples of this embodiment, such as Figure 4a As shown, the elastic sealing ring 40 is fixed on the extrusion rod 30 and moves together with the extrusion rod 30 in the glue cavity. Under normal circumstances, the elastic sealing ring 40 can be fixed on the inner end of the extrusion rod 30. The so-called "inner end" refers to the end of the extrusion rod that extends into the glue cavity.

[0047] In some other examples of this embodiment, the elastic sealing ring 40 is fixed to the inner wall of the adhesive cavity, such as... Figure 4bAs shown, the elastic sealing ring 40 does not move with the extrusion rod 30 within the glue cavity. It is understood that when the elastic sealing ring 40 is fixed to the inner wall of the glue cavity, its position determines the length of the movement path of the corresponding extrusion rod 30 within the glue cavity, and also determines the effective volume of the glue cavity, naturally also determining the amount of glue stored in the cavity. To allow the glue cavity to store more glue, in this embodiment, the elastic sealing ring is fixedly positioned at the end of the glue cavity furthest from the valve core 20.

[0048] Assuming the cross-sectional area of ​​the glue cavity is s1, the cross-sectional area of ​​the extrusion rod 30 is s2, and the moving length of the extrusion rod 30 is d, then it should be understood that when the elastic sealing ring 40 is fixed on the extrusion rod 30, the volume V1 of glue drawn / extruded by the moving length d of the extrusion rod 30 is:

[0049] V1 = s1 * d;

[0050] When the elastic sealing ring 40 is fixed on the inner wall of the glue cavity, the volume V2 of glue drawn / extruded by the moving length d of the extrusion rod 30 is:

[0051] V2 = s2 * d;

[0052] In some other examples of this embodiment, elastic sealing rings 40 can also be fixedly provided on both the inner wall of the glue cavity and the extrusion rod 30. In this case, the volume of glue drawn / extruded per unit length of movement of the extrusion rod 30 should be calculated according to the cross-section s1 of the glue cavity, but the amount of glue that the glue cavity can store is determined by the position of the elastic sealing ring fixedly provided inside the glue cavity.

[0053] The valve core 20 is disposed in the valve core mounting cavity 113. In some examples of this embodiment, the valve body 10 is integrally formed. In other examples of this embodiment, the valve body 10 includes an upper valve body and a valve core sleeve, wherein the glue cavity (circulation cavity 112 and injection cavity 111) is disposed in the upper valve body, and the valve core mounting cavity 113 is disposed in the valve core sleeve. The valve core sleeve is detachably connected to the upper valve body. Therefore, in these examples, the valve core sleeve and valve core 20 in the dispensing valve 1 can be disassembled and replaced.

[0054] The valve core 20 can move within the valve core mounting cavity 113. It is understood that, in order to allow the valve core 20 to cooperate with the valve body 10, the gap between the valve core 20 and the valve core mounting cavity 113 is very small. In some examples of this embodiment, the valve core 20 can rotate within the valve core mounting cavity 113. Therefore, when the valve core 20 can rotate within the valve core mounting cavity 113, in order to avoid the valve core 20 encountering obstacles formed by the inner wall of the valve core mounting cavity 113 in the direction of rotation, the cross-sections of the valve core 20 and the valve core mounting cavity 113 should be circular. For example, the valve core 20 can be a cylinder, and the valve core mounting cavity 113 is also a cylindrical space. In some other examples, both the valve core 20 and the valve core mounting cavity 113 can be spindle-shaped. In other examples, the valve core 20 can be translated within the valve core mounting cavity 113. In this case, it should be ensured that the valve core 20 does not encounter any obstacles formed by the inner wall of the valve core mounting cavity 113 in the translational direction. The valve core 20 and the valve core mounting cavity 113 can be prisms, such as cylinders or prismatic bodies. In this case, there are not many requirements for the shape of the cross-section of the valve core 20 and the valve core mounting cavity 113. For example, the shape of the cross-section of the valve core 20 and the valve core mounting cavity 113 can include, but is not limited to, rectangles, rhombuses, circles, and parallelograms.

[0055] In this embodiment, the valve core 20 is provided with multiple channels, which provide pathways for the flow of adhesive within the valve core 20. Some channels may have their main bodies located inside the valve core 20, with only their ends on the surface of the valve core 20; other channels may be entirely located on the surface of the valve core 20, in which case the channels are grooves formed on the surface of the valve core 20. The grooves on the valve core 20 include working adhesive extraction channels, working adhesive extrusion channels, circulating adhesive extraction channels, and circulating return channels. The working adhesive extraction channels and working adhesive extrusion channels correspond to the adhesive injection chamber 111, while the circulating adhesive extraction channels and circulating return channels correspond to the circulation chamber 112.

[0056] The working glue-drawing channel connects the second end of the glue storage cylinder interface 122 to the glue injection chamber 111 during the glue-drawing stage, allowing the glue in the glue storage cylinder to enter the glue injection chamber through the working glue-drawing channel, thereby achieving glue drawing from the glue injection chamber 111. The working glue-extrusion channel connects the second end of the needle interface to the glue injection chamber 111 during the glue-extrusion stage, allowing the glue in the glue injection chamber 111 to enter the dispensing needle through the working glue-extrusion channel and be extruded from the dispensing needle, thereby achieving glue extrusion from the glue injection chamber 111. The circulating glue-drawing channel connects the second end of the glue storage cylinder interface to the circulating chamber 112 during the glue drawing stage, allowing the glue in the glue storage cylinder to enter the circulating chamber 112 through the circulating glue-drawing channel, thereby achieving glue drawing from the circulating chamber 112. The circulation return channel is used to connect the circulation chamber 112 with the glue storage cylinder during the glue extrusion stage, so that the glue in the circulation chamber 112 can enter the glue storage cylinder and realize the return of the glue in the circulation chamber 112.

[0057] It should be understood that when there is more than one dispensing chamber 111 on the dispensing valve 1, each dispensing chamber 111 may be provided with a separate working dispensing channel and a working dispensing channel, or two or more dispensing chambers 111 may share the same working dispensing channel and working dispensing channel; when there is more than one circulation chamber 112 on the dispensing valve 1, each circulation chamber 112 may be provided with a separate circulation dispensing channel and a circulation return channel, or two or more circulation chambers 112 may share the same circulation dispensing channel and circulation return channel.

[0058] The working glue extraction channel, working glue extrusion channel, circulating glue extraction channel, and circulating return channel are categorized as either "connected" or "blocked." A channel is connected when both ends are unblocked. A channel is blocked when at least one end is blocked. In this embodiment, because the valve core 20 can move relative to the valve core mounting cavity 113, each channel can be configured as either connected or blocked depending on the relative position of the valve core 20 and the valve core mounting cavity 113.

[0059] It is understandable that the working glue extraction channel, working glue extrusion channel, circulating glue extraction channel, and circulating return channel are not simultaneously connected. For example, the working glue extraction channel and the working glue extrusion channel will not be connected simultaneously, nor will the circulating glue extraction channel and the circulating return channel. This is because it is impossible for a glue chamber to be extruded simultaneously in the glue extraction channel. In addition, if the corresponding working glue extraction channel is connected during the glue extrusion process of a glue injection chamber 111, the glue extruded from that glue injection chamber 111 is likely to return to the glue storage tank through the corresponding working glue extraction channel instead of being squeezed into the dispensing needle, thus interfering with the normal dispensing operation of the dispensing valve 1.

[0060] Please see Figure 5 The image shows a valve spool that switches the connected channel by rotating it in the valve spool housing cavity 113:

[0061] Figure 5 (a) shows a schematic diagram of one state of the valve core 20. Figure 5 (b) shows a schematic diagram of the valve core 20 after it has been rotated 90°. Figure 5 (c) shows Figure 5 A schematic diagram of the cross-section at point "I" in (a), and Figure 5 (d) shows Figure 5 A schematic diagram of the cross-section at “I” in (b).

[0062] comprehensive Figure 5It can be seen that the working glue extraction channel 211 is connected to the circulating glue extraction channel 221 and is disposed on the surface of the valve core 20 along the axis of the valve core 20. It is understood that in some other examples of this embodiment, the working glue extraction channel 211 and the circulating glue extraction channel 221 can also be independent of each other. When the working glue extraction channel 211 and the circulating glue extraction channel 221 are independent of each other, the second end of the glue storage cylinder interface 122 can include multiple ports to ensure that each port corresponds to a glue extraction channel.

[0063] Normally, because the dispensing needle is located directly below the dispensing valve 1, the dispensing chamber 111 and the needle interface 121 are located opposite each other on the side of the valve core mounting chamber 113. For example, in Figure 5 Among them, the working extrusion channel 212 can penetrate the valve core along a direction perpendicular to the axis of the valve core 20. Specifically, in Figure 5 In (b), the axis cd of the working extrusion channel 212 is perpendicular to the axis ab of the valve core 20. Additionally, in Figure 5 In this configuration, the working extrusion channel 212 intersects the axis of the valve core 20. This means that in the cross-section of the valve core 20, the working extrusion channel 212 passes through the center of the cross-section. For example, when the valve core 20 is cylindrical, the working extrusion channel 212 will pass through the center of the cross-section. It should be understood that... Figure 5 In the valve core 20 shown, the working extrusion channel 212 is a straight channel, but in some other examples of this embodiment, the working extrusion channel 212 may also be "turned" on the valve core 20.

[0064] In some examples of this embodiment, the recirculation return channel 222 and the recirculation glue extraction channel 212 may be the same. In this case, the circulation chamber 112 can draw glue from the glue storage tank along a channel and return the drawn glue back to the glue storage tank along the same channel. However, in more examples, the recirculation return channel 222 and the recirculation glue extraction channel 212 are independent of each other and are not the same channel. In these examples, the recirculation return channel 222 will circulate the glue through the return port provided on the valve body 10. Please refer to [link to relevant documentation]. Figure 6a The diagram shows the structure of the valve body 10 from one viewing angle (front view), and... Figure 6b A schematic diagram of the valve body 10 from another viewing angle (side view):

[0065] A return port 123 is disposed on the valve body 10. One end of the return port 123 is used to communicate with the circulation return channel 222 during the extrusion stage with the circulation chamber 112, and the other end is used to communicate with the glue storage tank. In some examples of this embodiment, the return port 123 can be directly connected to the glue storage tank, but in other examples, the return port 123 needs to be connected to the glue storage tank through other components. For example, in some examples, the return port 123 can be connected to the glue storage tank through a return pipe, with one end of the return pipe connected to the return port 123 and the other end connected to the glue storage tank.

[0066] In these examples, the placement of the recirculation channel 222 on the valve core 20 is closely related to the position of the recirculation port 123 on the valve body 10. For example, if the recirculation port 123 and the circulation chamber 112 are located on opposite sides of the valve core mounting cavity 113, the recirculation channel 222 can also penetrate the valve core 20 perpendicularly. Furthermore, the axis of the valve core 20 can intersect the recirculation channel 222, meaning that the recirculation channel 222 passes through the center of the cross-section of the valve core 20. For instance, when the valve core 20 is cylindrical, the recirculation channel 222 passes through the center of the cross-section. In other examples, although the recirculation port 123 and the circulation chamber 112 are located on different sides of the valve core mounting cavity 113, they are not directly opposite each other. Therefore, the recirculation channel 222 is arranged with a bend on the valve core 20. Figure 5 In (a), the circulation chamber 112 is located above the circulation placement chamber 113, while the return port 123 is located on the front of the valve body 10. Therefore, the circulation return channel 222 is arranged in a "7" shape in the valve core 20. Please refer to [link to previous section]. Figure 5 , Figure 5 (e) shows Figure 5 A schematic diagram of the cross-section at point "II" in (a), and Figure 5 (f) shows Figure 5 A schematic diagram of the cross section at “II” in (b).

[0067] It is understandable that the "7"-shaped recirculation channel 222 consists of two sub-channels. Figure 5 In this embodiment, the two sub-channels are perpendicular to each other, and the angle at the "7"-shaped corner is 90°. However, in some other examples of this embodiment, the angle at the "7"-shaped corner may not be 90°; for example, it may be greater than 90°. Furthermore, although in... Figure 5 In the central circulation return channel 222, the "7"-shaped corner is a sharp angle, but in some other examples of this embodiment, the corner can also be a rounded corner. Besides this, although in Figure 5The recirculation channel 222 may include only one corner, but in some other examples of this embodiment, the recirculation channel 222 may also include two or more corners.

[0068] It is understandable that even if the relative positions of the return port 123 and the circulation chamber 112 are the same in both dispensing valves, this does not mean that the arrangement of the circulation return channel 222 in the two dispensing valves is necessarily the same. For example, in one example, the circulation chamber 112 is still located above the valve core mounting chamber 113, and the return port 123 is still located in front of the valve core mounting chamber 113. However, in this example, the circulation return channel 222 is not arranged in a "7" shape in the valve core 20, but is arranged on the surface of the valve core 20. Please refer to [link to relevant documentation]. Figure 7 ,in, Figure 7 (a) shows a schematic diagram of one state of the valve core 20. Figure 7 (b) shows a schematic diagram of the valve core 20 after it has been rotated 90°. Figure 7 (c) shows Figure 7 A schematic diagram of the cross-section at point "II" in (a), and Figure 7 (d) shows Figure 7 A schematic diagram of the cross section at “II” in (b).

[0069] In the aforementioned example, a scheme was provided in which the valve core 20 switches the connected channel by rotation. Below, another scheme is provided in which the valve core 20 switches the connected channel by translation:

[0070] It is understandable that when the valve core 20 switches the connected channels by translating within the valve core mounting cavity 113, the arrangement of each individual channel on the valve core 20—the working glue extraction channel 211, the circulating glue extraction channel 221, the working glue extrusion channel 212, and the circulating return channel 222—can still be described as described above, for example:

[0071] In some examples, the working glue extraction channel 211 and the circulating glue extraction channel 221 can still be connected. In some examples, the working glue extraction channel 211 and the circulating glue extraction channel 221 can be arranged on the surface of the valve core 20 along the axis of the valve core 20.

[0072] In some examples, the working extrusion channel 212 may extend through the valve core 20 in a direction perpendicular to the axis of the valve core 20. In some examples, the working extrusion channel 212 may intersect the axis of the valve core 20. In some examples, the working extrusion channel 212 may also be "turned" on the valve core 20.

[0073] In some examples, the circulating return channel 222 and the circulating glue extraction channel 212 can be the same. In some examples, the circulating return channel 222 and the circulating glue extraction channel 212 are independent of each other, and the circulating return channel 222 circulates the glue through the return port 123 provided on the valve body 10. When the return port 123 and the circulation chamber 112 are located on opposite sides of the valve core mounting chamber 113, the circulating return channel 222 can pass through the valve core 20 perpendicular to the axis of the valve core 20; when the return port 123 and the circulation chamber 112 are located on different sides of the valve core mounting chamber 113, but are not directly opposite each other, the circulating return channel 222 will be arranged with a bend on the valve core 20, for example, in a "7" shape.

[0074] For details regarding the configuration of the circulating return channel 222, the circulating glue extraction channel 221, the working glue extrusion channel 212, and the working glue extraction channel 211, please refer to the description in the foregoing embodiments; these details will not be repeated here. However, it should be understood that when the valve core 20 switches between connected channels by rotating within the valve core mounting cavity 113, the glue outlet of the working glue extraction channel 211 and the glue inlet of the working glue extrusion channel 212 should be at the same position on the axis of the valve core 20. For example, in… Figure 5 Both are located at point "I" on the axis of valve core 20. Since valve core 20 switches by rotation, the outlet of working glue extraction channel 211 and the inlet of working glue extrusion channel 212 are located on different sides of valve core 20. The outlet of circulating glue extraction channel 221 and the inlet of circulating return channel 222 should also be positioned identically on the axis of valve core 20. Figure 5 For example, both are located at "II" on the axis of valve core 20, and they are located on different sides of valve core 20. When valve core 20 switches the connected channels by translating within valve core mounting cavity 113, the outlet of working glue extraction channel 211 and the inlet of working glue extrusion channel 212 are located at different positions on the axis of valve core 20, but they are located on the same side of valve core 20. Please refer to [link to relevant documentation]. Figure 8 The diagram in (a) shows one state of the valve core 20, while Figure 8 (b) shows Figure 8 (a) is a schematic diagram of a state after the valve core 20 has been translated. Figure 8 (c) shows Figure 8 A schematic diagram of the cross-section at point "III" in (a). Figure 8 (d) shows Figure 8 A schematic diagram of the cross-section at point “Ⅳ” in (a).

[0075] The dispensing valve provided in this embodiment not only features a circulation chamber, a circulation extrusion rod, a circulation extraction channel, and a circulation return channel to circulate the adhesive in the storage tank, preventing the adhesive from settling due to stagnation, but also includes a return port. This return port and return pipe further enhance the circulation of the adhesive in the storage tank, improving its fluidity and reducing sedimentation. This, in turn, helps improve the quality and yield of LED products.

[0076] Example 2:

[0077] This embodiment also provides a dispensing device; please refer to [link / reference]. Figure 9 The dispensing device 9 includes the dispensing valve 1 provided in any of the aforementioned examples, and also includes a power unit. Figure 9 (Not shown), glue reservoir 91, glue dispensing needle 92.

[0078] Understandably, the glue storage cylinder 91 is connected to the dispensing valve 1 through the glue storage cylinder interface 122, and is used to store the prepared glue, which can be a mixture of encapsulating glue and phosphor, or a mixture of encapsulating glue and quantum dot material.

[0079] The dispensing needle 92 is connected to the dispensing valve 1 via the needle interface 121. It is understood that the number of dispensing needles 92 is usually the same as the number of dispensing chambers 111 in the dispensing valve 1, and also usually the same as the number of dispensing extrusion rods 31 in the dispensing valve 1. Of course, in some examples, one needle interface 121 includes multiple first ends; in this case, multiple dispensing needles 92 correspond to one dispensing chamber 111 and one dispensing extrusion rod 31.

[0080] The power unit includes a glue rod power unit and a valve core power unit. The glue rod power unit drives the extrusion rods 30 to move along the axis of the glue cavity. It is understood that the dispensing valve 1 includes at least two extrusion rods 30, and in some other examples, the dispensing valve 1 may include more injection extrusion rods 31 and / or more circulating extrusion rods 32. Therefore, in some examples of this embodiment, the glue rod power unit can simultaneously drive each extrusion rod 30 to move in the same direction, in which case the extrusion rods 30 are linked together. However, in some other examples, the glue rod power unit can drive each extrusion rod 30 separately, for example, simultaneously driving each extrusion rod 30 to perform different movements, or driving each extrusion rod 30 to move sequentially. It is understood that some extrusion rods 30 in the dispensing valve 1 can be driven in a linked manner, while others can be driven independently. For example, the glue rod power unit can drive all the injection extrusion rods 31 in a linked manner to simultaneously draw and extrude glue, while the circulating extrusion rods 32 are driven individually.

[0081] The valve core power unit is used to drive the valve core 20 to move relative to the valve core mounting cavity 113. As can be seen from the previous introduction, the movement of the valve core 20 relative to the valve core mounting cavity 113 includes either the rotation of the valve core 20 in the valve core mounting cavity 113 or the translation of the valve core 20 relative to the valve core mounting cavity 113.

[0082] In this embodiment, if the valve body of the dispensing valve 1 is provided with a return pipe interface 123, the dispensing device 9 further includes a return pipe 93. One end of the return pipe interface 123 is used to connect with the outlet of the circulation return channel 222 during the dispensing stage of the circulation chamber 112, and the other end is used to connect with the inlet of the return pipe 93. Understandably, the return pipe 93 is mainly used to connect the circulation chamber 112 and the glue storage cylinder 91 to realize the return of glue. Therefore, the glue outlet of the return pipe 93 is set on the glue storage cylinder 91. Considering that the amount of glue sucked by the circulation chamber 112 each time is about 3% of the effective capacity of the glue storage cylinder 91, in order to maximize the flow of glue in the glue storage cylinder, in this embodiment, the glue outlet of the return pipe 93 is set on the upper part of the side wall of the glue storage cylinder 91. In some examples, the glue outlet of the return pipe 93 is even located at the top of the glue storage cylinder. In this way, the circulation chamber 112 can suck the glue at the bottom of the glue storage cylinder 91 under the action of the circulation extrusion rod 32, and then return the glue to the top of the glue storage cylinder through the return pipe 93, so as to minimize the sedimentation of glue in the glue storage cylinder.

[0083] The dispensing device provided in this embodiment can prevent the glue in the storage tank from settling due to prolonged stagnation, and keep the glue in a uniform ratio for a long time. This not only helps to improve the quality and pass rate of LED products, but also ensures that the glue in the storage tank can be used up by the dispensing device because the ratio is always uniform, thereby improving the effective utilization rate of the glue, reducing material waste, and lowering the cost of glue raw materials.

[0084] Example 3:

[0085] To enable those skilled in the art to better understand the structure and advantages of the dispensing valve and dispensing device provided in the foregoing examples, this embodiment will continue to describe the two in conjunction with the examples. Please refer to [link to relevant documentation]. Figures 10-11 The dispensing device 100 shown:

[0086] The dispensing device 100 includes a dispensing valve 40, a dispensing needle 50, a glue reservoir 60, a return pipe 70, and a power unit (not shown in the figure). The dispensing valve 40 includes a valve body, a valve core 42, and a glue extrusion rod.

[0087] The valve body includes a valve body cover 411, an upper valve body 412, and a valve core sleeve 413. The valve body cover 411 and the upper valve body 412 are detachably connected, and the upper valve body 412 and the valve core sleeve 413 are also detachably connected. The valve body cover 411 and the valve core sleeve 413 are respectively located at both ends of the upper valve body 412.

[0088] The upper valve body 412 is provided with at least one injection cavity 412a and at least one circulation cavity 412b. The injection cavity 412a cooperates with the injection extrusion rod 431 in the extrusion rod, and the circulation cavity 412b cooperates with the circulation extrusion rod 432 in the extrusion rod. In order to form a piston mechanism between the cavity and the extrusion rod, in this embodiment, a cavity elastic sealing ring R1 is fixedly provided at the end of the inner wall of the injection cavity 412a away from the valve core, and a rod elastic sealing ring R2 is fixedly provided on the inner end of the circulation extrusion rod 432. The outer diameter of the cavity elastic sealing ring R1 matches the size of the injection cavity 412a, and the inner diameter of the cavity elastic sealing ring R1 matches the size of the injection extrusion rod 431. The cavity elastic sealing ring R1 can seal the gap between the injection extrusion rod 431 and the injection cavity 412a. The outer diameter of the elastic sealing ring R2 on the rod matches the size of the circulation chamber 412b, and the inner diameter of the elastic sealing ring R2 on the rod matches the size of the circulation extrusion rod 432. The elastic sealing ring R2 on the rod can seal the gap between the circulation extrusion rod 432 and the circulation chamber 412b.

[0089] Understandably, because there is no elastic sealing ring on the glue injection extrusion rod 431, the volume of glue drawn / extruded by the movement length d of the glue injection extrusion rod 431 is: v1 = s * d; where s is the cross-sectional area of ​​the glue injection extrusion rod 431. Because there is an elastic sealing ring on the circulating extrusion rod 432, the volume of glue drawn / extruded by the movement length d of the glue injection extrusion rod 431 is: v2 = S * d; where S is the cross-sectional area of ​​the elastic sealing ring R2 on the rod.

[0090] Of course, in other examples, an elastic sealing ring can be provided on the injection extrusion rod 431, and a cavity elastic sealing ring can be provided in the circulation chamber 412b; or, elastic sealing rings can be provided on both the injection extrusion rod 431 and the circulation extrusion rod 432, but no cavity elastic sealing ring is provided in the corresponding glue cavity; or, cavity elastic sealing rings can be provided in both the injection cavity 412a and the circulation chamber 412b, but no elastic sealing ring is provided on the corresponding extrusion rod. In this embodiment, the amount of glue extruded per unit distance of the extrusion rod movement is called the "unit extrusion amount". Typically, the ratio of the unit extrusion amount of the circulation extrusion rod 432 to the unit extrusion amount of the injection extrusion rod 431 is between 0.5 and 5.

[0091] The valve core sleeve 413 has a valve core mounting cavity 4130. In this embodiment, the axes of the dispensing cavity 412a and the circulation cavity 412b are parallel to each other, while the axis of the valve core mounting cavity 4130 is perpendicular to the axis of the dispensing cavity 412a. The valve core sleeve 413 also has a needle interface 413a, a glue reservoir interface 413b, and a return interface 413c. The needle interface 413a is used to connect the dispensing needle 50, the glue reservoir interface 413b is used to connect the glue reservoir 60, and the return interface 413c is used to connect the return tube 70. The other end of the return tube 70 communicates with a return hole provided on the glue reservoir 60. The return hole is a through hole located at least 20 mm from the bottom of the glue reservoir 60. In some examples of this embodiment, the inner diameter of the return tube 70 is greater than 0.2 mm, and the length is greater than 50 mm.

[0092] The valve core is housed within the valve core mounting cavity 4130 and can rotate around its axis within the cavity. The valve core is equipped with a glue extraction channel, a working glue extrusion channel, and a circulation return channel. The working glue extrusion channel and the circulation return channel correspond to the glue injection cavity 412a and the circulation cavity 412b, respectively, while the glue extraction channel corresponds to both the injection cavity 412a and the circulation cavity 412b. In this embodiment, the glue injection extrusion rod 431 and the circulation extrusion rod 432 are linked; therefore, the glue extraction in the injection cavity 412a and the circulation cavity 412b are synchronized, and the glue extrusion is also synchronized.

[0093] During the glue extraction stage of the glue injection chamber 412a and the circulation chamber 412b, the glue inlet of the glue extraction channel is connected to the end of the glue storage cylinder interface 413b away from the glue storage cylinder 60. The glue outlet of the glue extraction channel includes two outlets, one of which is connected to the glue injection chamber and the other of which is connected to the circulation chamber.

[0094] During the glue extrusion stage of the glue injection chamber 412a and the circulation chamber 412b, the glue inlet of the working glue extrusion channel is connected to the glue injection chamber 412a, and the glue outlet is connected to the needle interface 413a; the glue inlet of the circulation return channel is connected to the circulation chamber 412b, and the glue outlet is connected to the return interface 413c.

[0095] The valve core and valve core sleeve 413 can be made of the same or different materials, including but not limited to ceramic and tungsten steel. In this embodiment, both the valve core mounting cavity 4130 and the valve core are cylindrical. The glue extraction channel is set on the surface of the valve core along its axis, and the working glue extrusion channel penetrates the valve core in a direction perpendicular to its axis. The circulation return channel is set in a bend within the valve core, forming a "7" shape in the cross-section of the valve core.

[0096] Understandably, in some other examples, the valve core can also be translated within the valve core mounting cavity 4130 to achieve the switching of the connected channels. In these examples, the translation distance of the valve core within the valve core mounting cavity 4130 can be greater than 1.5 mm.

[0097] The valve body cover 411 can be used to lock the elastic sealing ring. At the same time, the valve body cover 411 is provided with a bubble venting hole (or overflow hole) 411a and a collection groove 411b. Therefore, it can collect the glue overflowing from the bubble venting hole 411a during the bubble venting process or normal dispensing process through the collection groove 411b.

[0098] The dispensing valve and dispensing device provided in this embodiment prevent phosphor from settling in the encapsulating adhesive, ensure the consistency of the adhesive powder, and improve the color consistency of the finished LED product.

[0099] Undoubtedly, the LEDs prepared by the dispensing valves and dispensing devices provided in the foregoing embodiments can be applied to various light-emitting fields. For example, they can be made into backlight modules for display backlighting (which can be backlight modules for terminals such as televisions, monitors, and mobile phones). In this case, they can be applied to backlight modules. Besides display backlighting, they can also be applied to button backlighting, photography, home lighting, medical lighting, decoration, automotive, and transportation fields. When applied to button backlighting, they can serve as backlight sources for buttons on devices with buttons such as mobile phones, calculators, and keyboards; when applied to photography, they can be made into camera flashes; when applied to home lighting, they can be made into floor lamps, table lamps, lighting lamps, ceiling lights, downlights, and spotlights; when applied to medical lighting, they can be made into surgical lights and low-electromagnetic lighting lamps; when applied to decoration, they can be made into various decorative lights, such as various colored lights, landscape lighting, and advertising lights; when applied to the automotive field, they can be made into car lights and car indicator lights; and when applied to the transportation field, they can be made into various traffic lights and streetlights. The above applications are merely a few examples of applications exemplified in this embodiment. It should be understood that the applications of LEDs in this embodiment are not limited to the few fields exemplified above.

[0100] The above description, in conjunction with specific implementation methods, provides a further detailed explanation of the embodiments of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A dispensing valve, characterized in that, The device includes a valve body, a valve core, and an extrusion rod. The valve body has a glue storage cylinder interface, the first end of which is connected to a glue storage cylinder. The valve body also contains a valve core mounting cavity and a glue cavity, the glue cavity including a circulation cavity. The extrusion rod includes a circulation extrusion rod that matches the circulation cavity, moving along the axis of the circulation cavity to change the air pressure within it. The valve core is located within the valve core mounting cavity and is movable relative to it. The valve core has a circulating glue extraction channel and a circulating return channel, each channel being configured to either be connected or closed depending on the relative position of the valve core and the valve core mounting cavity. During the glue extraction stage of the circulation chamber, the second end of the glue extraction channel is connected to the second end of the glue storage cylinder interface and the circulation chamber, so that the glue in the glue storage cylinder can enter the circulation chamber through the glue extraction channel; During the glue extrusion stage in the circulation chamber, the circulation return channel connects the circulation chamber to the glue storage cylinder so that the glue in the circulation chamber can enter the glue storage cylinder. The valve body is also provided with a return pipe interface. One end of the return pipe interface is used to connect with the glue outlet in the circulation return channel during the glue extrusion stage in the circulation chamber, and the other end is used to connect with the glue inlet of the return pipe. The glue outlet of the return pipe is used to communicate with the return hole provided on the side wall of the glue storage cylinder. The valve body is also provided with a needle interface, the first end of which is used to connect with a dispensing needle; the glue chamber also includes a glue injection chamber, and the glue extrusion rod includes a glue injection extrusion rod that matches the glue injection chamber. The glue injection extrusion rod moves along the axis of the glue injection chamber to change the air pressure in the glue injection chamber; the valve core is also provided with a working glue extraction channel and a working glue extrusion channel, and the working glue extraction channel is interconnected with the circulating glue extraction channel; During the glue extraction stage of the glue injection chamber, the working glue extraction channel connects the second end of the glue storage cylinder to the glue injection chamber, allowing the glue in the glue storage cylinder to enter the glue injection chamber through the working glue extraction channel; during the glue extrusion stage of the glue injection chamber, the working glue extrusion channel connects the second end of the needle interface to the glue injection chamber, allowing the glue in the glue injection chamber to enter the dispensing needle through the working glue extrusion channel and be extruded from the dispensing needle; the glue extraction and extrusion of the glue injection chamber and the circulation chamber are performed synchronously.

2. The dispensing valve as described in claim 1, characterized in that, The valve body includes an upper valve body and a valve core sleeve. The rubber cavity is disposed in the upper valve body, and the valve core mounting cavity is disposed in the valve core sleeve. The valve core sleeve is detachably connected to the upper valve body.

3. The dispensing valve as described in claim 1, characterized in that, The valve core can be translated relative to the valve core mounting cavity along its axial direction; or, the valve core can be rotated relative to the valve body body about its axis.

4. The dispensing valve as described in claim 1, characterized in that, The working glue extraction channel and the circulating glue extraction channel are arranged on the surface of the valve core along the axis of the valve core.

5. The dispensing valve as described in claim 1, characterized in that, The working extrusion channel extends through the valve core along a direction perpendicular to the valve core's axis.

6. The dispensing valve as described in claim 1, characterized in that, An elastic sealing ring is fixedly provided at one end of the glue cavity away from the valve core, and / or an elastic sealing ring is fixedly provided at the inner end of the glue extrusion rod, the inner end of which is the end of the glue extrusion rod that extends into the glue cavity; the elastic sealing ring is used to seal the gap between the glue extrusion rod and the glue cavity in the radial direction of the glue cavity.

7. The dispensing valve according to any one of claims 1-6, characterized in that, The circulation return channel extends through the valve core in a direction perpendicular to its axis, or the circulation return channel is shaped like a "7" in the cross-section of the valve core, or the circulation return channel is disposed on the surface of the valve core.

8. A dispensing device, characterized in that, The dispensing device includes a power unit, a glue reservoir, a dispensing needle, and a dispensing valve as described in any one of claims 1-7. The glue reservoir is connected to the first end of the glue reservoir interface on the dispensing valve. The power unit includes a glue rod power unit and a valve core power unit. The glue rod power unit is used to drive the glue extrusion rod to move along the axis of the glue cavity, and the valve core power unit is used to drive the valve core to move relative to the valve core placement cavity.

9. The dispensing device as described in claim 8, characterized in that, The valve body of the dispensing valve is provided with a return pipe interface. One end of the return pipe interface is used to connect with the outlet of the circulating return channel during the dispensing stage of the circulating chamber, and the other end is used to connect with the inlet of the return pipe. The outlet of the return pipe is located on the upper part of the side wall of the glue storage cylinder.

10. The dispensing apparatus as described in claim 8 or 9, characterized in that, The valve body is provided with a needle interface, the first end of which is used to connect to a dispensing needle; the glue chamber also includes an injection chamber, and the extrusion rod includes an injection extrusion rod that matches the injection chamber. The injection extrusion rod moves along the axis of the injection chamber to change the air pressure in the injection chamber; the glue rod power device drives the circulating extrusion rod and the injection extrusion rod synchronously.

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