CN112815095A

CN112815095A - Precision screw dispensing injection pump shaft seal structure

Info

Publication number: CN112815095A
Application number: CN202110148305.7A
Authority: CN
Inventors: 谭军钱; 陈文宗
Original assignee: Dongguan Juzhun Automation Equipment Co ltd
Current assignee: Dongguan Juzhun Automation Equipment Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-05-18

Abstract

The application relates to a point is glued and is annotated liquid equipment technical field, and more specifically says that it relates to a liquid pump bearing seal structure is glued to accurate screw rod point, including the ring body with locate the ring body inboard and the epaxial hourglass hopper-shaped buffering body of cover locating. The buffer body can absorb the deformation of the bending movement of the ring body, thereby reducing the vibration on the shaft. In addition, the elasticity of the funnel-shaped buffer body is better and better from the circumferential direction to the central part, the buffer effect is better, the central part is tightly attached to the shaft, the elastic tilting is not easy to occur, the rubber material is prevented from permeating, and the sealing effect is good.

Description

Precision screw dispensing injection pump shaft seal structure

Technical Field

The application relates to a liquid equipment technical field is annotated in point, more specifically says that it relates to a liquid pump shaft seal structure is annotated in accurate screw rod point.

Background

Along with the rapid development and growth of 3D printing technology, various glue injection mechanism designs are also available in the market at present, a motor is used for driving a screw rod to rotate forwards and backwards through a gearbox, the screw rod can be linked with a piston assembly arranged in a preset charging barrel to reciprocate, so that the piston assembly is used for extruding molten plastics in the charging barrel to form a discharging (glue injection) action, the combined structure is large in size and high in cost, the discharging (glue injection) amount is not easy to accurately control, and the practical application range of the combined structure is limited.

In order to overcome the above disadvantages, there is a design in the market that a rotary screw rod replaces a telescopic piston assembly (or a glue drawing rod), in which a glue injection channel in a (injection) cylinder is provided with a screw rod with a coaxial (central) center, the shaft rod is directly or indirectly driven by a preset power source (step motor), and the rotation of the screw rod extrudes molten plastics in the (injection) cylinder, so that the plastics can flow out through a preset glue dispensing head at the end of the (injection) cylinder, thereby achieving a precise discharge (glue injection) control function.

However, the screw is rotated by the helical screw to stir the molten plastic in the cylinder, so as to achieve the purpose of pressurization, but the screw is not designed properly, and the inside of the screw is easy to vibrate due to centrifugal force, thereby reducing the service life of the product.

Disclosure of Invention

To the not enough of above-mentioned prior art, the purpose of this application provides a liquid charge pump bearing seal structure is glued to accurate screw rod point, has the advantage of buffering shock attenuation.

1. The technical purpose of the application is realized by the following technical scheme: the utility model provides a liquid pump bearing seal structure is glued to accurate screw rod point, includes the ring body and locates the inboard and epaxial hourglass hopper-shaped buffering body of cover locating of ring body.

Preferably, a sealing ring is annularly arranged on the outer side of the shaft seal.

Preferably, an annular groove is formed in the outer side of the shaft seal, and the sealing ring is embedded in the annular groove.

Preferably, the thickness of the buffer body is gradually reduced from the circumferential direction to the center.

To sum up, the beneficial effect that this application has: the buffer body can absorb the deformation of the bending movement of the ring body, thereby reducing the vibration on the shaft. In addition, the elasticity of the funnel-shaped buffer body is better and better from the circumferential direction to the central part, the buffer effect is better, the central part is tightly attached to the shaft, the elastic tilting is not easy to occur, the rubber material is prevented from permeating, and the sealing effect is good.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a cross-sectional view of the overall structure when the embodiment of the present application is applied;

FIG. 3 is a partial exploded view of an eccentric feed as applied to an embodiment of the present application;

FIG. 4 is another perspective view of a partial exploded view of an eccentric feed as applied to an embodiment of the present application;

fig. 5 is a cross-sectional view of an embodiment of the present application.

Reference numerals: 1. a machine base; 11. a feed port; 2. a material injection pipe; 3. a first screw member; 4. dispensing a glue head; 5. a second threaded member; 6. an eccentric feed section; 61. a coupling; 62. a connecting shaft; 63. a drive shaft; 64. a screw shaft; 7. shaft sealing; 71. a ring body; 72. a buffer body; 73. a seal ring; 8. and a rubber stator sleeve.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or position relative to the orientation or position shown in the drawings to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be considered limiting of the application.

Furthermore, the terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

A precision screw dispensing and filling pump, see fig. 1 to 5, comprising:

a frame 1 for mounting a driving part (not shown) and having a through hole;

the material injection pipe 2 is coaxial with the through hole and is arranged at the bottom end of the machine shell through a first threaded part 3;

the dispensing head 4 is coaxially arranged at the bottom end of the material injection pipe 2 with the through hole through a second threaded part 5;

the eccentric feeding part 6 comprises a coupling 61, a connecting shaft 62, a shaft sleeve and a shaft sleeve, wherein the coupling 61, the connecting shaft 62 and the shaft sleeve are sequentially connected and rotatably connected with the inner wall of the through hole,

The transmission shaft 63 and the screw shaft 64, the coupler 61, the connecting shaft 62 and the transmission shaft 63 are coaxially connected, the screw shaft 64 and the transmission shaft 63 are eccentrically connected, and the connecting shaft 62 and the transmission shaft 63, and the transmission shaft 63 and the screw shaft 64 are hinged through pin shafts.

When the liquid injection pump works, the eccentric feeding part 6 is driven to rotate by the driving part and passes through the coupling 61 and the connecting shaft 62

The screw shaft 64 is driven to do eccentric motion by the transmission of the transmission shaft 63, so that the screw shaft 64 does eccentric rotation in the material injection pipe 2, and the rubber material is extruded to the dispensing head 4 under the combined action of the centrifugal force, the rubber material gravity and the screw feeding of the screw shaft 64 by utilizing the larger centrifugal force generated in the process of the eccentric rotation of the screw shaft 64, so that the rubber material discharging pressure, the rubber material discharging speed and the rubber material discharging amount are improved, and the structure is exquisite and compact; in addition, the connecting shaft 62 and the transmission shaft 63 are hinged through pin shafts, and the transmission shaft 63 and the screw shaft 64 are hinged through pin shafts, so that the rigid connection is changed into movable connection, small eccentric vibration is absorbed, and the movement of the screw shaft 64 is stable and smooth.

In this embodiment, the base 1, the feeding tube 2 and the dispensing head 4 are all sealed.

Specifically, a feeding hole 11 communicated with the through hole is formed in one side of the machine base 1. Of course, the number and the position of the feeding holes 11 can be adjusted according to actual requirements.

Specifically, a shaft seal 7 is arranged between the connecting shaft 62 and the inner wall of the through hole.

Specifically, the shaft seal 7 includes a ring 71 and a funnel-shaped buffer 72 disposed inside the ring 71 and sleeved on the shaft. The cushion body 72 can absorb the amount of deformation of the ring body 71 due to bending. In this embodiment, the shaft is the connecting shaft 62.

Specifically, the driving part is a servo motor. The servo motor is accurately controlled, and the glue yield of the glue material can be accurately controlled; and through the corotation of servo motor, can realize that the dispensing head 4 goes out to glue, through servo motor reversal, can realize that dispensing head 4 "inhales to glue", after dispensing, can avoid dispensing head 4 to appear spilling the condition of gluing like this for the point is glued and is got things neatly more.

Specifically, a sealing ring 73 is annularly arranged on the outer side of the shaft seal 7. So as to maintain the sealing performance between the outer periphery of the shaft and the inner wall of the through hole. Specifically, an annular groove is formed in the outer side of the shaft seal 7, and the sealing ring is embedded in the annular groove. The annular groove can limit the up-and-down displacement of the sealing ring 73, and plays a role in positioning.

Specifically, the thickness of the cushion body 72 is gradually reduced from the circumferential direction to the center. Therefore, the elasticity is better and better from the circumferential direction to the central part, the buffering effect is better, the central part is tightly attached to the shaft, the elasticity is not easy to warp, the rubber material is prevented from permeating, and the sealing effect is good.

Specifically, the first screw member 3 and the second screw member 5 are both nuts.

Specifically, the inner wall of the material injection pipe 2 is provided with a rubber stator sleeve 8 with threads, which is used for reducing the impact of the screw shaft 64 on the inner wall of the material injection pipe 2 and guiding the rubber to make spiral motion.

The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims of the present application.

Claims

1. The utility model provides a liquid pump shaft seal structure is annotated in accurate screw rod point, characterized by includes the ring body and locates the ring body inboard and overlap and locate epaxial hourglass hopper-shaped buffering body.

2. The precision screw dispensing and injection pump shaft seal structure according to claim 1, which is characterized in that: and a sealing ring is annularly arranged on the outer side of the shaft seal.

3. The precision screw dispensing injection pump shaft seal structure according to claim 2, characterized in that: the outer side of the shaft seal is provided with an annular groove, and the sealing ring is embedded in the annular groove.

4. The precision screw dispensing injection pump shaft seal structure according to claim 3, characterized in that: the thickness of the buffer body is gradually reduced from the circumferential direction to the center.