CN219232944U

CN219232944U - Ultra-micro volume metering dispensing valve and mounting seat

Info

Publication number: CN219232944U
Application number: CN202223178075.8U
Authority: CN
Inventors: 张涛; 林雄界; 乐猛; 易智勇; 王正龙; 卢国艺
Original assignee: Shenzhen Tengsheng Precision Equipment Co ltd
Current assignee: Shenzhen Tengsheng Precision Equipment Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-06-23
Anticipated expiration: 2032-11-28

Abstract

The utility model relates to the technical field of dispensing equipment, and discloses an ultra-micro volume metering dispensing valve and a mounting seat. The ultra-micro volume metering dispensing valve comprises: the feeding device comprises a valve body, a feeding mechanism and an extrusion mechanism arranged in the valve body, wherein an inner cavity is arranged in the valve body, a nozzle with a hollow interior is arranged on one side, close to the inner cavity, of the valve body, a first through hole penetrating through the valve body is arranged between the inner cavity and the nozzle, the inner cavity is communicated with the first through hole, and the nozzle is communicated with the first through hole; the feeding mechanism provides glue; the extrusion mechanism comprises a valve rod, a piezoelectric assembly and a pushing assembly for outputting linear motion, wherein the piezoelectric assembly comprises an elastic piece, a piezoelectric stack and a plunger arranged at one end of the piezoelectric stack, and the elastic piece is arranged at one end of the plunger, which is away from the piezoelectric stack. The scheme reduces the influence of volume compression and expansion of glue on control precision, and is suitable for ultra-micro precise dispensing control of granular liquid.

Description

Ultra-micro volume metering dispensing valve and mounting seat

Technical Field

The utility model relates to the technical field of dispensing equipment, in particular to an ultra-micro volume metering dispensing valve and a mounting seat.

Background

The dispensing valve is an automatic machine which is specially used for controlling liquid and pouring, smearing and filling the liquid on the surface of a product or in the product. With the continuous development of technology, the dispensing machine is widely applied to the automobile manufacturing industry, the electronic manufacturing industry, industrial electric industry, solar photovoltaic industry, constructional engineering and the like.

In the prior art, the common needle striking valve, screw valve, injection valve and the like in the market have the defects of different degrees, and in principle, the liquid is subjected to unavoidable mechanical rigid extrusion action, so that the internal tissues of the liquid are destroyed; particularly, liquid with particles such as soldering paste, silver paste and the like can cause particles to deform or adhere together to form large particles due to mechanical effects such as impact, extrusion, friction and the like, so that a needle is blocked or the outlet flow is unstable, and ultra-micro precise dispensing is difficult to realize.

Disclosure of Invention

The utility model mainly aims to provide an ultra-micro volume metering type dispensing valve and a mounting seat, and aims to solve the technical problems of needle blockage or unstable outlet flow in precise dispensing.

In order to achieve the above object, the present utility model provides an ultra-micro volume metering dispensing valve, comprising: the valve body is internally provided with an inner cavity, one side of the valve body, which is close to the inner cavity, is provided with a nozzle with a hollow interior, a first through hole penetrating through the valve body is arranged between the inner cavity and the nozzle, the inner cavity is communicated with the first through hole, and the nozzle is communicated with the first through hole; the feeding mechanism is used for providing glue; the extrusion mechanism comprises a valve rod, a piezoelectric assembly and a pushing assembly for outputting linear motion, the piezoelectric assembly comprises an elastic piece, a piezoelectric stack and a plunger arranged at one end of the piezoelectric stack, the elastic piece is arranged at one end of the plunger, which is away from the piezoelectric stack, and is propped against the wall of the inner cavity, the piezoelectric assembly is arranged in the inner cavity, the plunger reciprocates up and down in the inner cavity, the valve rod is movably arranged in the first through hole, two ends of the valve rod extend out of the first through hole, two flow passages which are not communicated with each other are arranged in the valve rod, one end of the valve rod is connected with the pushing assembly, the other end of the valve rod is communicated with a discharge hole of the feeding mechanism, the valve rod reciprocates left and right under the driving of the pushing assembly, one flow passage is communicated with the inner cavity and the discharge hole of the feeding mechanism when the valve rod moves to the left limit, and the other flow passage is communicated with the inner cavity and the nozzle when the valve rod moves to the right limit.

Optionally, the feeding mechanism comprises a needle cylinder filled with glue, one end of the needle cylinder is provided with a hose communicated with the inner cavity of the needle cylinder, and the other end of the needle cylinder is communicated with the runner.

Optionally, the propelling movement subassembly includes connecting rod, support column and does the actuating lever of straight line reciprocating motion, the support column set up in the valve body, the connecting rod rotatable cover is located on the support column, connecting rod one end with the valve rod articulates, the other end with the actuating lever articulates.

Optionally, a first shaft shoulder for positioning is arranged at the joint of the valve rod and the hose, and a second shaft shoulder for positioning is arranged at the joint of the valve rod and the connecting rod.

Optionally, the flow channel comprises a first flow channel and a second flow channel, when the valve rod moves to the position that the first shaft shoulder is attached to the valve body, one end of the first flow channel is communicated with the hose, and the other end of the first flow channel is communicated with the inner cavity; when the valve rod moves to the second shoulder to be attached to the valve body, one end of the second flow channel is communicated with the inner cavity, and the other end of the second flow channel is communicated with the nozzle.

Optionally, an adapter is arranged between the needle cylinder and the hose.

Optionally, the ultra-micro volume metering dispensing valve further comprises an outer cover, the outer cover is sleeved on the surface of the valve body, the needle cylinder is mounted on the outer cover, and a power connector is arranged on the outer cover.

Optionally, the valve rod is made of tungsten steel.

The utility model also provides a mounting seat which is applied to the ultra-micro volume metering dispensing valve, the mounting seat comprises a base and a movable block, one end of the base is provided with a protruding part, the other end of the base is provided with a rotating shaft, the movable block is rotatably connected with the rotating shaft, the movable block is attached to the protruding part, a first fastening piece is arranged on the protruding part, a conical surface blind hole is formed in the top end of the movable block, the first fastening piece is tightly pressed on the conical surface blind hole, the movable block is tightly pressed on the rotating shaft, and one surface of the movable block, which is far away from the base, is connected with the valve body.

Optionally, the mount pad still includes the second fastener, the second fastener set up in the base center, correspond on the movable block the position of second fastener is equipped with the draw-in groove, the second fastener with the draw-in groove cooperation.

In the technical scheme provided by the utility model, when the ultra-micro volume metering dispensing valve starts to work, the pushing assembly makes linear motion to drive the valve rod to do left-right reciprocating motion, the left limit is that the valve rod moves to one end of the pushing assembly farthest from the valve body, the right limit is that the valve rod moves to one end of the pushing assembly closest to the valve body, and when the valve rod moves to the left limit, glue in the feeding mechanism is pumped into the inner cavity through a flow channel in the valve rod; when the valve rod moves to the right limit, the elastic piece in the piezoelectric component is a belleville spring, has the performance characteristics of high rigidity, high buffering and shock absorbing capacity and capability of bearing a large load with small deformation, and is suitable for occasions with small axial space requirements and high temperature and high pressure. Glue pumped into the inner cavity due to the up-and-down reciprocating motion of the plunger is pushed into the runner by the plunger and flows into the nozzle to be sprayed out. In the process, the piezoelectric stack pushes the plunger to perform nanoscale positioning movement in the inner cavity, and according to the volume metering principle, the plunger movement distance multiplied by the plunger sectional area is the actual adhesive amount; the plunger is pushed by the pressing point stack to move only in the nano level, so that the volume of glue contained in the inner cavity is small, the design can reduce the influence of glue volume compression and expansion on control precision, and the design can not have rigid extrusion effect on glue, so that the damage of liquid tissues is avoided, and the plunger is particularly suitable for ultra-micro precise dispensing control of liquid containing particles such as tin paste, silver paste and the like.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.

FIG. 1 is a schematic diagram of the overall structure of an embodiment of an ultra-micro volume metering dispensing valve and mounting base of the present utility model;

FIG. 2 is a schematic diagram of an embodiment of the ultra-micro volume metering dispensing valve filled with glue according to the present utility model;

FIG. 3 is a schematic diagram of an embodiment of the present utility model for extruding glue through an ultra-micro volume metering dispensing valve;

fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

Wherein, 1, ultra-micro volume metering dispensing valve; 2. a valve body; 21. an inner cavity; 211. a second through hole; 22. a nozzle; 23. a first through hole; 3. a feeding mechanism; 31. a needle cylinder; 32. a hose; 33. an adapter; 4. an extrusion mechanism; 41. a pushing assembly; 411. a connecting rod; 412. a support column; 413. a driving rod; 42. a piezoelectric assembly; 421. a piezoelectric stack; 422. a plunger; 43. a valve stem; 431. a first flow passage; 432. a second flow passage; 433. a first shoulder; 434. a second shoulder; 5. an outer cover; 51. a power supply connector; 6. a mounting base; 61. a movable block; 611. a clamping groove; 612. conical blind holes; 62. a base; 621. a boss; 6211. a first fastener; 622. a rotating shaft; 623. and a second fastener.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like are used in this specification for purposes of illustration only. In the description of the present utility model, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. The terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or groups thereof may be present or added.

Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the utility model described below can be combined with one another as long as they do not conflict with one another.

As shown in fig. 1, the present utility model provides an ultra-micro volume metering dispensing valve 1, wherein the ultra-micro volume metering dispensing valve 1 comprises: the valve body 2 is internally provided with an inner cavity 21, one side, close to the inner cavity 21, of the valve body 2 is provided with a nozzle 22 with a hollow inside, a first through hole 23 penetrating through the valve body 2 is arranged between the inner cavity 21 and the nozzle 22, the inner cavity 21 is communicated with the first through hole 23, and the nozzle 22 is communicated with the first through hole 23; the feeding mechanism 3, the feeding mechanism 3 provides glue; the extrusion mechanism 4 is arranged in the valve body 2, the extrusion mechanism 4 comprises a valve rod 43, a piezoelectric assembly 42 and a pushing assembly 41 for outputting linear motion, the piezoelectric assembly 42 comprises an elastic piece, a piezoelectric stack 421 and a plunger 422 arranged at one end of the piezoelectric stack 421, the elastic piece is arranged at one end of the plunger 422, which is away from the piezoelectric stack 421, and is propped against the wall of the inner cavity 21, the piezoelectric assembly 42 is arranged in the inner cavity 21, the plunger 422 reciprocates up and down in the inner cavity 21, the valve rod 43 is movably arranged in a first through hole 23, two ends of the valve rod extend out of the first through hole 23, two flow passages which are not communicated with each other are arranged in the valve rod 43, one end of the valve rod 43 is connected with the pushing assembly 41, the other end of the valve rod 43 is communicated with a discharge port of the feeding mechanism 3, the valve rod 43 reciprocates left and right under the driving of the pushing assembly 41, one flow passage is communicated with the inner cavity 21 and the discharge port of the feeding mechanism 3 when the valve rod 43 moves to the left limit, and the other flow passage is communicated with the inner cavity 21 and the nozzle 22 when the valve rod 43 moves to the right limit.

In the technical scheme provided by the utility model, when the ultra-micro volume metering dispensing valve 1 starts to work, the pushing component 41 moves linearly to drive the valve rod 43 to do left-right reciprocating motion, the left limit is that the valve rod 43 moves to one end of the pushing component 41 farthest from the valve body 2, the right limit is that the valve rod 43 moves to one end of the pushing component 41 closest to the valve body 2, and when the valve rod 43 moves to the left limit, glue in the feeding mechanism 3 is pumped into the inner cavity 21 through a flow channel in the valve rod 43; when the valve rod 43 moves to the right limit, the elastic element in the piezoelectric assembly 42 is a belleville spring, has the performance characteristics of high rigidity, high buffering and shock absorbing capacity and capability of bearing a large load with small deformation, and is suitable for occasions with small axial space requirements and high temperature and high pressure. Glue pumped into the cavity 21 by the up and down reciprocating motion of the plunger 422 is pushed into the flow channel by the plunger 422 and flows out into the nozzle 22. In the process, the piezoelectric stack 421 pushes the plunger 422 to perform nano-scale positioning movement in the inner cavity 21, and according to the volumetric metering principle, the movement distance of the plunger 422 multiplied by the sectional area of the plunger 422 is the actual discharged glue amount; the movement amount of the plunger 422 is only nano-scale under the pushing of the pressing point stack, so that the volume of the glue contained in the inner cavity 21 is small, the design can reduce the influence of the volume compression and expansion of the glue on the control precision, and the rigid extrusion effect of the glue can be avoided, so that the liquid tissue is prevented from being damaged, and the device is particularly suitable for ultra-micro precise dispensing control of liquid containing particles, such as tin paste, silver paste and the like.

As shown in fig. 1 to 2, in the present embodiment, the feeding mechanism 3 includes a cylinder 31 filled with glue, one end of the cylinder 31 is provided with a hose 32 communicating with the inner cavity 21 of the cylinder 31, and the other end communicates with a flow passage. The syringe 31 is used for containing glue needed by dispensing, and has the advantages of low cost and simple structure.

As shown in fig. 2 to 3, in the present embodiment, the pushing assembly 41 includes a connecting rod 411, a supporting column 412 and a driving rod 413 that performs a linear reciprocating motion, the supporting column 412 is disposed in the valve body 2, the connecting rod 411 is rotatably sleeved on the supporting column 412, one end of the connecting rod 411 is hinged with the valve rod 43, and the other end is hinged with the driving rod 413. The driving piece is fixedly connected with a power source arranged in the valve body 2, the power source can be a power element such as a cylinder or a motor, and the driving piece is driven to do linear reciprocating motion during operation. The driving piece drives the valve rod 43 to do left and right reciprocating motion through the connecting rod 411, glue solution is filled in a reciprocating mode and extruded, and the glue dispensing valve integrally adopts the valve rod 43 which moves in a reciprocating mode, namely, shear type glue solution filling is achieved, and the glue dispensing valve is simple in structure and efficient in filling.

As shown in fig. 2 to 4, in the present embodiment, a first shoulder 433 for positioning is provided at the joint of the valve stem 43 and the hose 32, and a second shoulder 434 for positioning is provided at the joint of the valve stem 43 near the connecting rod 411. When the valve rod 43 moves to the first shaft shoulder 433 to be attached to the valve body 2, the valve rod 43 moves to the left limit; when the valve rod 43 moves to the second shoulder 434 to be engaged with the valve body 2, the valve rod 43 moves to the right limit. The first shoulder 433 and the second shoulder 434 provided at both ends of the valve stem 43 mainly play a role in positioning.

As shown in fig. 2 to 4, in the present embodiment, the flow passage includes a first flow passage 431 and a second flow passage 432, when the valve rod 43 moves to the first shaft shoulder 433 to be attached to the valve body 2, one end of the first flow passage 431 is communicated with the hose 32, and the other end is communicated with the inner cavity 21; when the valve rod 43 moves to the second shoulder 434 to be attached to the valve body 2, one end of the second flow passage 432 is communicated with the inner cavity 21, and the other end is communicated with the second nozzle 22. The first flow channel 431 is in an inverted L shape as a whole, and two outlets are respectively communicated with the end face of the valve rod 43 and the side face of the valve rod 43, and glue solution provided by the feeding mechanism 3 flows from the end face outlet of the valve rod 43 to the side face outlet of the valve rod 43 and then flows into the inner cavity 21. The second flow passage 432 is in an I shape and is perpendicular to the first through hole 23, the inner cavity 21 and the second flow passage 432 form a straight-through flow passage, compared with a non-straight-through flow passage, the plunger 422 in the inner cavity 21 has smaller pressure loss when extruding glue solution, and the cleaning and the maintenance are easier.

As shown in fig. 2, in the present embodiment, an adapter 33 is provided between the cylinder 31 and the hose 32. When the feeding mechanism 3 works, the glue solution is fed into the needle cylinder 31 by compressing air and then is fed into the inner cavity 21 through the hose 32 to extrude the glue. In this process, the syringe 31 is in a high temperature and high pressure state, and the joint of the syringe 31 and the hose 32 is particularly easy to leak glue, so that a high temperature resistant and firm adapter 33 is required to be arranged between the hose 32 and the syringe 31 to ensure the normal operation of the device.

As shown in fig. 2 to 3, in the present embodiment, the ultra-micro volume metering dispensing valve 1 further includes a housing 5, the housing 5 is sleeved on the surface of the valve body 2, the syringe 31 is mounted on the housing 5, and the housing 5 is provided with a power connector 51. The housing 5 has functions of protecting the valve body 2, housing the fixed cylinder 31, and providing the power connector 51, etc. The power connector 51 is electrically connected with the piezoelectric stack 421 and the power source respectively, and supplies power to the whole dispensing valve.

As shown in fig. 1-4, in one embodiment, the valve stem 43 is made of tungsten steel. The valve rod 43 is made of wear-resistant tungsten steel with high hardness, high precision and long service life.

As shown in fig. 1 to 4, in this embodiment, the present utility model further provides a mounting seat 6, which is applied to, for example, an ultra-micro volume metering dispensing valve 1, where the mounting seat 6 includes a base 62 and a movable block 61, one end of the base 62 is provided with a boss 621, the other end is provided with a rotating shaft 622, the movable block 61 is rotatably connected with the rotating shaft 622, the movable block 61 is attached to the boss 621, the boss 621 is provided with a first fastening member 6211, the top end of the movable block 61 is provided with a conical surface blind hole 612, the first fastening member 6211 is pressed on the conical surface blind hole 612, and the movable block 61 is pressed on the rotating shaft 622, and one surface of the movable block 61 away from the base 62 is connected with the valve body 2. When the mounting seat 6 is used, the ultra-micro volume metering dispensing valve 1 is fixed on the movable block 61 through connecting pieces such as screws, the base 62 is fixedly connected with an external support through the screws, the base 62 is mounted on the rotating shaft 622, the base 62 and the movable block 61 rotate to mutually attached positions, the first fastening piece 6211 is screwed on the conical surface blind hole 612 of the movable block 61, and the conical surface of the conical surface blind hole 612 and the conical surface of the first fastening piece 6211 are eccentric to one side so that the movable block 61 is tightly pressed on the rotating shaft 622.

As shown in fig. 1 to 4, in the present embodiment, the mounting base 6 further includes a second fastening member 623, the second fastening member 623 is disposed at the center of the base 62, a clamping groove 611 is disposed on the movable block 61 corresponding to the position of the second fastening member 623, and the second fastening member 623 is matched with the clamping groove 611. The second fastener 623 may be a pin that is embedded in the base 62. During installation, the movable block 61 is matched with the rotating shaft 622, the movable block 61 is rotated, the clamping groove 611 in the movable block 61 passes through the second fastening piece 623 to lean against the base 62, the first fastening piece 6211 is screwed down to enable the first fastening piece 6211 to be tightly pressed on the conical surface blind hole 612 of the movable block 61, the conical surface blind hole 612 and the conical surface of the first fastening piece 6211 are eccentric to one side, so that the movable block 61 tightly leans against the second fastening piece 623, the second fastening piece 623 is arranged on the base 62 and clamped in the clamping groove 611, and compared with the rotating shaft 622, the clamping groove has more supporting force, and the structural strength of the whole installation seat 6 is enhanced. When the first fastening piece 6211 is loosened during disassembly, the movable block 61 is rotated, so that the ultra-micro volume metering dispensing valve 1 can be disassembled from the base 62, and the disassembly is simple and convenient.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. An ultra-micro volume metering dispensing valve, characterized in that the ultra-micro volume metering dispensing valve comprises:

the valve body is internally provided with an inner cavity, one side of the valve body, which is close to the inner cavity, is provided with a nozzle with a hollow interior, a first through hole penetrating through the valve body is arranged between the inner cavity and the nozzle, the inner cavity is communicated with the first through hole, and the nozzle is communicated with the first through hole;

the feeding mechanism is used for providing glue;

the extrusion mechanism comprises a valve rod, a piezoelectric assembly and a pushing assembly for outputting linear motion, the piezoelectric assembly comprises an elastic piece, a piezoelectric stack and a plunger arranged at one end of the piezoelectric stack, the elastic piece is arranged at one end of the plunger, which is away from the piezoelectric stack, and is propped against the wall of the inner cavity, the piezoelectric assembly is arranged in the inner cavity, the plunger reciprocates up and down in the inner cavity, the valve rod is movably arranged in the first through hole, two ends of the valve rod extend out of the first through hole, two flow passages which are not communicated with each other are arranged in the valve rod, one end of the valve rod is connected with the pushing assembly, the other end of the valve rod is communicated with a discharge hole of the feeding mechanism, the valve rod reciprocates left and right under the driving of the pushing assembly, one flow passage is communicated with the inner cavity and the discharge hole of the feeding mechanism when the valve rod moves to the left limit, and the other flow passage is communicated with the inner cavity and the nozzle when the valve rod moves to the right limit.

2. The ultra-micro volume metering dispensing valve of claim 1, wherein the feeding mechanism comprises a syringe filled with glue, one end of the syringe is provided with a hose communicated with the inner cavity of the syringe, and the other end of the syringe is communicated with the runner.

3. The ultra-micro volume metering dispensing valve according to claim 2, wherein the pushing assembly comprises a connecting rod, a supporting column and a driving rod which makes linear reciprocating motion, the supporting column is arranged in the valve body, the connecting rod is rotatably sleeved on the supporting column, one end of the connecting rod is hinged with the valve rod, and the other end of the connecting rod is hinged with the driving rod.

4. The ultra-micro volume metering dispensing valve of claim 3, wherein a first shoulder for positioning is provided at the joint of the valve rod and the hose, and a second shoulder for positioning is provided at the joint of the valve rod and the connecting rod.

5. The ultra-micro volume metering dispensing valve of claim 4, wherein the flow passage comprises a first flow passage and a second flow passage, wherein when the valve rod moves to the first shaft shoulder to be attached to the valve body, one end of the first flow passage is communicated with the hose, and the other end is communicated with the inner cavity;

when the valve rod moves to the second shoulder to be attached to the valve body, one end of the second flow channel is communicated with the inner cavity, and the other end of the second flow channel is communicated with the nozzle.

6. The ultra-micro volume metering dispensing valve of claim 2, wherein an adapter is provided between the syringe and the hose.

7. The ultra-micro volume metering dispensing valve of claim 2 or 6, further comprising an outer cover, wherein the outer cover is sleeved on the surface of the valve body, the syringe is mounted on the outer cover, and a power connector is arranged on the outer cover.

8. The ultra-micro volume metering dispensing valve of claim 1 wherein the valve stem is made of tungsten steel.

9. The mounting seat is characterized in that the mounting seat is applied to the ultra-micro volume metering type dispensing valve according to any one of claims 1 to 8, the mounting seat comprises a base and a movable block, one end of the base is provided with a protruding portion, the other end of the base is provided with a rotating shaft, the movable block is rotatably connected with the rotating shaft, the top end of the movable block is attached to the protruding portion, a first fastening piece is arranged on the protruding portion, a conical surface blind hole is formed in the top end of the movable block, the first fastening piece is tightly pressed on the conical surface blind hole, the movable block is pressed on the rotating shaft, and one surface of the movable block, which is far away from the base, is connected with the valve body.

10. The mounting base of claim 9, further comprising a second fastener disposed in the center of the base, wherein a slot is disposed in the movable block at a position corresponding to the second fastener, and the second fastener is engaged with the slot.