CN220072209U - Dispensing machine - Google Patents

Abstract

The utility model discloses a glue dispenser, which comprises a storage tank, a storage cavity, a glue dispensing needle and a glue dispensing valve, wherein the storage tank is used for storing glue; the dispensing valve can be switched between a first state and a second state; when the dispensing valve is in a first state, the dispensing valve enables the storage tank to be in fluid communication with the storage cavity and cuts off a flow passage communicated between the storage cavity and the dispensing needle so as to guide the sizing material from the storage tank to the storage cavity; when the dispensing valve is in the second state, the dispensing valve enables the storage cavity to be in fluid communication with the dispensing needle and cuts off a flow passage communicated between the storage tank and the storage cavity. Through carrying out the setting as above to the dispensing valve, avoid the dispensing needle and store the storage tank direct communication that has more fluid, the dispensing needle is when the point is glued with the storage chamber direct communication of storing less fluid, has reduced the degree of difficulty of dispensing volume control, does benefit to the stability of dispensing volume at every turn.

Description

Dispensing machine

Technical Field

The utility model relates to the technical field of processing equipment, in particular to a dispensing machine.

Background

The dispensing machine is a machine which is specially used for controlling fluid and dripping, coating and encapsulating the fluid on the surface of a product or in the product, so that the dispensing machine achieves the functions of sealing, fixing, waterproofing and the like. The dispensing machine is mainly used for bonding, pouring, coating, sealing and filling glue, oil and other liquids in the product technology. When used to apply glue, the dispenser may also be referred to as a dispenser.

The conventional dispensing machine has the problem that dispensing is difficult to stabilize, and inconvenience is brought to users.

Disclosure of Invention

The utility model mainly provides a dispensing machine for improving the dispensing stability.

In order to solve the technical problems, the utility model adopts a technical scheme that: provided is a dispenser including: the device comprises a storage tank, a storage cavity, a dispensing needle and a dispensing valve; wherein the storage tank is used for storing sizing materials; the dispensing valve can be switched between a first state and a second state; when the dispensing valve is in the first state, the dispensing valve enables the storage tank to be in fluid communication with the storage cavity and cuts off a flow passage communicated between the storage cavity and the dispensing needle so as to guide the sizing material from the storage tank to the storage cavity; when the dispensing valve is in the second state, the dispensing valve enables the storage cavity to be in fluid communication with the dispensing needle and cuts off a flow passage communicated between the storage tank and the storage cavity.

In one embodiment, the volume of the storage chamber is less than the volume of the reservoir.

In one embodiment, the dispensing valve is a three-way valve; the dispensing valve comprises a valve body and a valve core; the valve body is provided with a first through hole, a second through hole and a third through hole, the first through hole is in fluid communication with the storage cavity, the second through hole is in fluid communication with the storage tank, and the third through hole is in fluid communication with the dispensing needle; the axis of the second through hole and the axis of the third through hole are symmetrical with respect to the axis of the first through hole.

In one embodiment, the valve core is provided with a fluid channel, and the fluid channel comprises a feeding section and a discharging section which extend in a straight line, and an arc-shaped section connected between the feeding section and the discharging section.

In an embodiment, when the dispensing valve is in the first state, the axis of the discharging section coincides with the axis of the first through hole, and the axis of the feeding section coincides with the axis of the second through hole; when the dispensing valve is in the second state, the axis of the feeding section coincides with the axis of the first through hole, and the axis of the discharging section coincides with the axis of the third through hole.

In an embodiment, the dispensing valve is switched from the first state to the second state or from the second state to the first state, and the valve core rotates by the same angle relative to the valve body as the included angle formed by the axis of the feeding section and the axis of the discharging section.

In an embodiment, a runner wall of the runner communicated between the storage tank and the dispensing valve comprises a first inner wall and a first outer wall, a first cooling cavity is formed between the first inner wall and the first outer wall in a defined mode, and the first cooling cavity is used for containing first cooling liquid.

In an embodiment, the cavity wall of the storage cavity comprises a second inner wall and a second outer wall, a second cooling cavity is defined between the second outer wall and the second inner wall, and the second cooling cavity is used for containing a second cooling liquid.

In one embodiment, the device further comprises a piston and a motor; the storage cavity is provided with a first opening and a second opening which are oppositely arranged; the piston at least partially penetrates through the first opening and is arranged in the storage cavity; the second opening is used for enabling the storage cavity to be in fluid communication with the storage tank or the dispensing needle;

when the dispensing valve is in the first state, the motor drives the piston to move in a direction away from the second opening; when the dispensing valve is in the second state, the motor drives the piston to move towards the direction close to the second opening.

In an embodiment, the dispensing valve further comprises a cylinder, and the cylinder drives the dispensing valve to switch between the first state and the second state through a rack and pinion structure.

The beneficial effects of the utility model are as follows: compared with the prior art, the utility model discloses a dispensing machine, which comprises a storage tank, a storage cavity, a dispensing needle and a dispensing valve, wherein the storage tank is used for storing sizing materials, and the dispensing valve can be switched between a first state and a second state; when the dispensing valve is in a first state, the dispensing valve enables the storage tank to be in fluid communication with the storage cavity and cuts off a flow passage communicated between the storage cavity and the dispensing needle so as to guide the sizing material from the storage tank to the storage cavity; when the dispensing valve is in the second state, the dispensing valve enables the storage cavity to be in fluid communication with the dispensing needle and cuts off a flow passage communicated between the storage tank and the storage cavity. Through carrying out the setting as above to the dispensing valve, avoid the dispensing needle and store the storage tank direct communication that has more fluid, the dispensing needle is when the point is glued with the storage chamber direct communication of storing less fluid, has reduced the degree of difficulty of dispensing volume control, does benefit to the stability of dispensing volume at every turn.

Drawings

For a clearer description of embodiments of the utility model or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the utility model, from which, without the inventive effort, other drawings can be obtained for a person skilled in the art, in which:

fig. 1 is a schematic cross-sectional structure of a dispenser according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a dispensing valve of the dispenser shown in fig. 1 in a first state and a second state;

FIG. 3 is an exploded view of the dispensing valve of the dispenser of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the valve core of the dispensing valve shown in FIG. 3;

FIG. 5 is a schematic perspective view of the dispenser of FIG. 1 in a viewing angle;

FIG. 6 is a schematic view of a partial enlarged structure of the area A of the dispenser shown in FIG. 1;

FIG. 7 is a schematic perspective view of the dispenser of FIG. 1 in another view;

FIG. 8 is a schematic view of a partial enlarged structure of a region B of the dispenser shown in FIG. 1;

fig. 9 is a schematic perspective view of the dispenser shown in fig. 1 in another view.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "first," "second," "third," and the like in embodiments of the present utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic cross-sectional structure of a dispensing machine according to an embodiment of the present utility model, and fig. 2 is a schematic structure of a dispensing valve of the dispensing machine shown in fig. 1 in a first state and a second state.

The dispensing machine comprises a storage tank 11, a storage cavity 12, a dispensing needle 13 and a dispensing valve 14. Dispensing valve 14 switches between a first state and a second state. When the dispensing valve 14 is in the first state, the dispensing valve 14 places the reservoir 11 in fluid communication with the reservoir 12 and intercepts the flow path between the reservoir 12 and the dispensing needle 13 to direct fluid in the reservoir 11 to the reservoir 12. When dispensing valve 14 is in the second state, dispensing valve 14 places reservoir 12 in fluid communication with dispensing needle 13 and blocks the flow path between reservoir 11 and reservoir 12.

In the dispensing process of the dispenser, the fluid stored in the storage tank 11 is a dispensing material (i.e., a glue stock), and the dispensing material may be a glue, a liquid, etc., that is, the dispenser is suitable for dispensing of the liquid, the glue, etc. The volume of the storage chamber 12 is smaller than the volume of the storage tank 11, and the amount of fluid stored in the storage tank 11 is larger than the amount of fluid stored in the storage chamber 12. By switching the dispensing valve 14 between the first state and the second state, the direct communication between the dispensing needle 13 and the storage tank 11 storing more fluid is avoided, the direct communication between the dispensing needle 13 and the storage cavity 12 storing less fluid is avoided, the difficulty in controlling the dispensing amount is reduced, and the stability of the dispensing amount at each time is facilitated. The fluid volume stored in the storage tank 11 is larger than the fluid volume stored in the storage cavity 12, so that the fluid in the storage tank 11 can flow into the storage cavity 12 and the sufficient fluid volume in the storage cavity 12 is ensured, the sufficient supply of the dispensing needle 13 is further ensured, and the smoothness of the dispensing process and the stability of dispensing every time are realized.

In this embodiment, the dispensing valve 14 is a three-way valve, and the specific structure can be seen in fig. 3 and the description thereof below. In other embodiments, the dispensing valve 14 is not limited to a three-way valve, and can be switched between the first state and the second state; for example, the dispensing valve 14 is a four-way valve, the dispensing valve 14 may be in a third state, etc., and the functions to be implemented by the dispensing valve 14 except the first state and the second state are specifically designed according to the needs.

Referring to fig. 3 and 4, fig. 3 is an exploded structure schematic view of a dispensing valve of the dispensing machine shown in fig. 1, and fig. 4 is a cross-sectional structure schematic view of a valve core of the dispensing valve shown in fig. 3.

Dispensing valve 14 includes a valve body 141 and a valve spool 142. The valve body 141 is provided with a receiving hole 1410, and the valve core 142 is disposed in the receiving hole 1410. Illustratively, the receiving hole 1410 penetrates through two opposite surfaces of the valve body 141, the receiving hole 1410 is a circular hole, and the valve core 142 is disposed in cooperation with the receiving hole 1410.

The valve body 141 is provided with a first through hole 1411, a second through hole 1412, and a third through hole 1413. The first through-hole 1411 is in fluid communication with the storage chamber 12. The second through-hole 1412 is in fluid communication with the reservoir 11 and the third through-hole 1413 is in fluid communication with the dispensing needle 13. The axis of the second through hole 1412 and the axis of the third through hole 1413 are symmetrically disposed about the axis of the first through hole 1411. Illustratively, the first through hole 1411, the second through hole 1412, and the third through hole 1413 are circular holes, which facilitate machining, and the circular holes do not have corners, which facilitate reducing resistance to fluid flow. The valve body 141 is illustratively a cuboid in outer contour, and the first through hole 1411, the second through hole 1412, and the third through hole 1413 are located on three sides of the cuboid, respectively.

The valve core 142 is provided with a fluid channel 1421, and an angle formed by an axis of a first port 1422 of the fluid channel 1421 and an axis of a second port 1423 of the fluid channel 1421 is half of an angle formed by an axis of the second through hole 1412 and an axis of the third through hole 1413. Specifically, the fluid channel 1421 includes a first segment 1421a, a second segment 1421b, and a third segment 1421c that are sequentially connected, where a port of the first segment 1421a, which is far from the second segment 1421b, is a first port 1422, and a port of the third segment 1421c, which is far from the second segment 1421b, is a second port 1423; the first segment 1421a and the third segment 1421c extend in a straight line, and an angle formed between the extending direction of the first segment 1421a and the extending direction of the third segment 1421c is the same as an angle formed between the axis of the first port 1422 of the fluid channel 1421 and the axis of the second port 1423 of the fluid channel 1421; the second segment 1421b extends in an arc to avoid sharp corners of the fluid pathway 1421, which may facilitate reducing the resistance to fluid flow. In other words, the first segment 1421a is defined as the discharge section of the fluid pathway 1421, the third segment 1421c is defined as the feed section of the fluid pathway 1421, and the second segment 1421b is an arcuate section connecting between the feed and discharge sections; the fluid channel includes a feed section and a discharge section extending in a straight line, and an arcuate section connected between the feed section and the discharge section.

Illustratively, the cross-sectional shape of the fluid channel 1421 is circular throughout along the fluid flow direction, facilitating processing, and reducing the fluid flow resistance.

When the dispensing valve 14 is in the first state, the axis of the first section 1421a (the discharging section) coincides with the axis of the first through hole 1411, and the axis of the third section 1421c (the feeding section) coincides with the axis of the second through hole 1412, so as to realize the communication between the storage cavity 12 and the storage tank 11 and to intercept the flow passage communicated between the storage cavity 12 and the dispensing needle 13. When the dispensing valve 14 is in the second state, the axis of the third section 1421c (feeding section) coincides with the axis of the first through hole 1411, and the axis of the first section 1421a (discharging section) coincides with the axis of the third through hole 1413, so as to realize fluid communication between the storage cavity 12 and the dispensing needle 13 and to intercept a flow passage communicated between the storage tank 11 and the storage cavity 12.

The dispensing valve 14 is switched from the first state to the second state or from the second state to the first state, and the valve spool 142 rotates with respect to the valve body 141 by the same angle as the axis of the first section 1421a (the discharging section) and the axis of the third section 1421c (the feeding section).

Illustratively, the axis of the second through-hole 1412 and the axis of the third through-hole 1413 are perpendicular to the axis of the first through-hole 1411, respectively; the axis of the second through hole 1412 coincides with the axis of the third through hole 1413, i.e., the axis of the second through hole 1412 makes an angle of 180 ° with the axis of the third through hole 1413; the axis of the first port 1422 of the fluid channel 1421 is perpendicular to the axis of the second port 1423 of the fluid channel 1421. The valve core 142 of the dispensing valve 14 is switched from the first state to the second state or from the second state to the first state by rotating by 90 °.

With continued reference to fig. 1, the dispenser further includes a cylinder 15, the cylinder 15 driving the dispensing valve 14 to switch between the first state and the second state. Specifically, referring to fig. 5, fig. 5 is a schematic perspective view of the dispenser shown in fig. 1 in a view angle state, and the cylinder 15 drives the valve core 142 of the dispensing valve 14 to rotate through a rack 151 and a gear 152 structure, so as to switch the dispensing valve 14 between the first state and the second state. In the present embodiment, the cylinder 15 is a pen-shaped cylinder; the pen-shaped air cylinder has a compact structure and is suitable for high-frequency use requirements; the gear 152 is connected with the valve core 142 and is coaxial with the valve core; therefore, the dispensing valve 14 can be switched between the first state and the second state at high frequency, and the continuous high-frequency dispensing requirement is met when the dispensing machine of the embodiment of the utility model is used for dispensing products.

Referring to fig. 1, the dispenser further includes a piston 16 and a motor 17. The opposite chamber walls of the storage chamber 12 are respectively provided with a first opening 121 and a second opening 122; that is, the storage chamber 12 has a first opening 121 and a second opening 122 disposed opposite to each other. The piston 16 is disposed at least partially through the first opening 121 within the storage chamber 12. The second opening 122 is used to place the reservoir 12 in fluid communication with the reservoir 11 or the dispensing needle 13. When the dispensing valve 14 is in the first state, the motor 17 drives the piston 16 to move in a direction away from the second opening 122 so as to suck the fluid in the storage tank 11 into the storage cavity 12, thereby realizing material taking; when the dispensing valve 14 is in the second state, the motor 17 drives the piston to move towards the direction close to the second opening 122, so as to press the fluid in the storage cavity 12 out to the dispensing needle 13, and thus the material injection is realized.

The first opening 121 is matched with the piston 16, the piston 16 seals the first opening 121, and meanwhile, the first opening 121 can smoothly reciprocate, so that the phenomenon of material leakage is avoided. The outer surface of the piston 16 is matched with the inner surface of the storage cavity 12, the gap between the outer surface of the part of the piston 16 positioned in the storage cavity 12 and the inner surface of the storage cavity 12 is as small as possible, the reciprocating motion of the piston 16 can be realized, the control of the amount of fluid pressed out by the piston 16 is facilitated, and the stability and the dispensing precision of dispensing are ensured. The portion of the piston 16 within the reservoir 12 is illustratively cylindrical in outer contoured shape. The storage chamber 12 is a cylindrical cavity.

In the present embodiment, the motor 17 is a servo motor, and the servo motor drives the piston 16 to move through a nut with a rod; the accuracy of control by using the servo motor is utilized, the servo motor is selected to drive the piston 16 to move, so that the control of the moving distance of the piston 16 is facilitated to be improved, the accurate control of the fluid quantity sucked from the storage tank 11 into the storage cavity 12 and the fluid quantity extruded from the storage cavity 12 to the dispensing needle 13 is further realized, the stability of dispensing is ensured, and the dispensing accuracy is improved. The motor 17 is not limited to a servo motor, and may drive the piston 16 to move.

It should be noted that, the dispensing valve 14 is driven by the air cylinder 15 to switch between the first state and the second state, and the motor 17 drives the piston 16 to move, so as to realize the automation of dispensing, save labor, and improve the dispensing efficiency.

Referring to fig. 6 and 7, fig. 6 is a schematic view of a partial enlarged structure of an area a of the dispenser shown in fig. 1, and fig. 7 is a schematic view of the dispenser shown in fig. 1 in another view.

The runner wall of the runner 18 communicated between the storage tank 11 and the dispensing valve 14 comprises a first inner wall 181 and a first outer wall 182, a first cooling cavity 183 is defined between the first inner wall 181 and the first outer wall 182, and the first cooling cavity 183 is used for accommodating a first cooling liquid. The flow channel wall of the flow channel 18 is provided with a first liquid inlet 184 and a first liquid outlet 185, and the first liquid inlet 184 and the first liquid outlet 185 are communicated with a first cooling cavity 183; specifically, the first liquid inlet 184 and the first liquid outlet 185 penetrate through the first outer wall 182. The first liquid inlet 184 is arranged at the end part of the flow channel wall of the flow channel 18, which is close to the dispensing valve 14, the first liquid outlet 185 is arranged at the end part of the flow channel wall of the flow channel 18, which is close to the storage tank 11, the first cooling liquid continuously flows into the first cooling cavity 183 from the first liquid inlet 184, and flows out of the first cooling cavity 183 from the first liquid outlet 185, so that the cooling of the fluid in the flow channel 18 is realized, and the dispensing machine is applicable to the situation of dispensing needing cooling. The flow rate of the first cooling liquid and the selection of the material of the first cooling liquid are designed according to the temperature requirement during cooling and dispensing.

Referring to fig. 8 and 9, fig. 8 is a schematic view of a partial enlarged structure of a region B of the dispenser shown in fig. 1, and fig. 9 is a schematic view of the dispenser shown in fig. 1 in another view.

The cavity wall of the storage cavity 12 includes a second inner wall 123 and a second outer wall 124, and a second cooling cavity 125 is defined between the second inner wall 123 and the second outer wall 124, and the second cooling cavity 125 is configured to accommodate a second cooling liquid. The cavity wall of the storage cavity 12 is provided with a second liquid inlet 126 and a second liquid outlet 127, and the second liquid inlet 126 and the second liquid outlet 127 are communicated with the second cooling cavity 125; specifically, the second liquid inlet 126 and the second liquid outlet 127 penetrate the second outer wall 124. The second inlet 126 is arranged at the end part of the cavity wall of the storage cavity 12, which is close to the dispensing valve 14, the second outlet 127 is arranged at the end part of the cavity wall of the storage cavity 12, which is close to the storage cavity 12, the second cooling liquid continuously flows into the second cooling cavity 125 from the second inlet 126, and flows out of the second cooling cavity 125 from the second outlet 127, so that the cooling of the fluid in the storage cavity 12 is realized, and the dispensing machine is suitable for the situation of dispensing needing cooling. The flow rate of the second cooling liquid and the selection of the material of the second cooling liquid are designed according to the temperature requirement during cooling and dispensing.

It should be noted that, the first cooling cavity 183 and the second cooling cavity 125 are both of optional structures, and whether the first cooling cavity 183 is formed on the runner wall of the runner 18 and whether the second cooling cavity 125 is formed on the cavity wall of the storage cavity 12 does not affect the dispensing precision and stability of the dispenser. When the dispenser is suitable for cooling dispensing, the first cooling chamber 183 may be formed only on the flow channel wall of the flow channel 18, the second cooling chamber 125 may be formed only on the cavity wall of the storage chamber 12, or the first cooling chamber 183 and the second cooling chamber 125 may be formed on the flow channel wall of the flow channel 18 and the cavity wall of the storage chamber 12 at the same time, and the design is specifically performed as required.

The action principle of dispensing by adopting the dispenser provided by the embodiment of the utility model is as follows: the cylinder 15 drives the dispensing valve 14 to be in a first state, the storage tank 11 is communicated with the storage cavity 12, the motor 17 drives the piston 16 to move in a direction away from the second opening 122, and part of fluid in the storage tank 11 is sucked into the storage cavity 12 to finish the material taking process; the cylinder 15 drives the dispensing valve 14 to be in the second state, the storage cavity 12 is communicated with the dispensing needle 13, the motor 17 drives the piston 16 to move towards the direction close to the second opening 122, and fluid in the storage cavity 12 is pressed out to complete the discharging process.

The joint of the storage tank 11 and the runner 18, the first through hole 1411, the second through hole 1412 and the third through hole 1413 are respectively provided with sealing elements, so that the leakage phenomenon is avoided.

The dispensing amount of the dispensing needle 13 of the dispensing machine provided by the embodiment of the utility model is 0-50g each time, that is, the dispensing amount can be adjusted steplessly within 0-50 g. Specifically, the moving distance of the piston 16 is controlled according to actual needs, and the dispensing amount of each time is adjusted. The dispensing precision of the dispensing needle 13 of the dispensing machine provided by the embodiment of the utility model is +/-0.015 g, so that the stability of the dispensing quantity at each time is ensured. The process control Coefficient (CPK) of the dispenser provided by the embodiment of the utility model is larger than 1.33, so that the stability of the dispensing amount at each time is ensured.

It should be noted that, when the dispensing machine provided by the embodiment of the utility model is used for dispensing, and different dispensing raw materials are needed to be used for dispensing different parts of the product or different products, the dispensing can be realized by only replacing the dispensing raw materials in the storage tank 11, and the material replacement is convenient, namely the dispensing is just used. The reservoir 11 may also be used to store cleaning fluid; the same dispensing machine uses different dispensing materials to dispense, the dispensing machine needs to be cleaned before the new dispensing material is replaced, cleaning liquid is replaced in the storage tank 11 or another storage tank 11 filled with the cleaning liquid is replaced, and the cleaning of pipeline parts of the dispensing machine can be realized according to the action principle of dispensing, and the cleaning process is automatic and efficient; that is, the dispenser provided by the embodiment of the utility model integrates the automatic suction cleaning function, and solves the problems that disassembly and cleaning are difficult to complete each time of dispensing, and a reloading structure is needed for cleaning. The cleaning liquid is selected according to the characteristics of the dispensing raw materials used in the previous dispensing, and can be cleaned.

In a specific embodiment, the dispensing machine provided by the embodiment of the utility model is used for dispensing the inside of the metal tube of the heating element of the electronic atomization device. Wherein the electronic atomizing device is used for atomizing an aerosol generating substrate to generate aerosol; the heating body comprises a metal tube and a heating wire, the heating wire is used for dispensing glue in the metal tube before being inserted into the metal tube, and the heating body can be applied to a low-temperature heating non-combustion type electronic atomization device.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. A dispenser, comprising:

the device comprises a storage tank, a storage cavity, a dispensing needle and a dispensing valve;

wherein the storage tank is used for storing sizing materials; the dispensing valve can be switched between a first state and a second state; when the dispensing valve is in the first state, the dispensing valve enables the storage tank to be in fluid communication with the storage cavity and cuts off a flow passage communicated between the storage cavity and the dispensing needle so as to guide the sizing material from the storage tank to the storage cavity; when the dispensing valve is in the second state, the dispensing valve enables the storage cavity to be in fluid communication with the dispensing needle and cuts off a flow passage communicated between the storage tank and the storage cavity.

2. The dispenser of claim 1, wherein the volume of the reservoir is less than the volume of the reservoir.

3. The dispenser of claim 1, wherein the dispensing valve is a three-way valve; the dispensing valve comprises a valve body and a valve core; the valve body is provided with a first through hole, a second through hole and a third through hole, the first through hole is in fluid communication with the storage cavity, the second through hole is in fluid communication with the storage tank, and the third through hole is in fluid communication with the dispensing needle; the axis of the second through hole and the axis of the third through hole are symmetrical with respect to the axis of the first through hole.

4. A dispenser according to claim 3, wherein the spool is provided with a fluid passage comprising a straight extending inlet section and outlet section, and an arcuate section connected between the inlet section and the outlet section.

5. The dispenser of claim 4, wherein the dispensing valve is in the first state with the axis of the discharge section coincident with the axis of the first through hole and the axis of the feed section coincident with the axis of the second through hole; when the dispensing valve is in the second state, the axis of the feeding section coincides with the axis of the first through hole, and the axis of the discharging section coincides with the axis of the third through hole.

6. The dispenser of claim 4, wherein the dispensing valve switches from the first state to the second state or vice versa, and the valve spool rotates relative to the valve body by the same angle as the angle formed by the axis of the inlet section and the axis of the outlet section.

7. The dispenser of claim 1, wherein the flow wall of the flow channel in communication between the reservoir and the dispensing valve comprises a first inner wall and a first outer wall defining a first cooling cavity therebetween for receiving a first cooling fluid.

8. The dispenser of claim 1, wherein the cavity wall of the storage cavity includes a second inner wall and a second outer wall defining a second cooling cavity therebetween for receiving a second cooling fluid.

9. The dispenser of claim 1, further comprising a piston and a motor; the storage cavity is provided with a first opening and a second opening which are oppositely arranged; the piston at least partially penetrates through the first opening and is arranged in the storage cavity; the second opening is used for enabling the storage cavity to be in fluid communication with the storage tank or the dispensing needle;

when the dispensing valve is in the first state, the motor drives the piston to move in a direction away from the second opening; when the dispensing valve is in the second state, the motor drives the piston to move towards the direction close to the second opening.

10. The dispenser of claim 1 or 7, further comprising a cylinder that drives the dispensing valve between the first state and the second state via a rack and pinion arrangement.