CN220697345U - Piston structure, glue outlet mechanism and glue coating equipment - Google Patents

Abstract

The utility model discloses a piston structure, a glue outlet mechanism and glue coating equipment, wherein the piston structure comprises: the piston and adjustment mechanism, the piston is cylindricly, adjustment mechanism and piston connection for adjust the biggest external diameter of piston, adjustment mechanism includes mobilizable regulation skeleton, and the piston cover is established in the periphery side of regulation skeleton and is connected with regulation skeleton, and regulation skeleton can draw in and can expand towards the central axis direction of keeping away from the piston towards the central axis direction that is close to the piston. According to the piston structure provided by the embodiment of the utility model, the universality of the piston structure can be improved, the abrasion to the piston structure can be reduced, and the service life of the piston structure can be prolonged.

Description

Piston structure, glue outlet mechanism and glue coating equipment

Technical Field

The utility model relates to the technical field of pistons, in particular to a piston structure, a glue outlet mechanism and glue spreading equipment.

Background

In the related art, a piston structure is generally disposed in a cylinder, and the piston structure can reciprocate relative to the cylinder. However, the piston structure and the cylinder body which are usually matched are required to meet that the outer diameter size of the piston structure is basically consistent with the inner diameter size of the cylinder body so that the piston structure can be closely matched with the cylinder body, and therefore the piston structure with one specification size cannot be matched with a plurality of cylinder bodies with different inner diameter sizes, and the universality of the piston structure is poor; and in the reciprocating motion process of the piston structure relative to the cylinder body, the close fit of the piston structure and the cylinder body can enable the mutual friction between the piston structure and the inner wall of the cylinder body to be large, so that the abrasion of the piston structure is easy to cause, and the service life of the piston structure is short. Thus, improvements are needed.

Disclosure of Invention

In view of the above problems, the present utility model provides a piston structure, which can improve the versatility of the piston structure, reduce the abrasion of the piston structure, and prolong the service life of the piston structure.

In a first aspect, an embodiment of the present utility model provides a piston structure, including: a piston having a cylindrical shape; the adjusting mechanism is connected with the piston and used for adjusting the maximum outer diameter of the piston, the adjusting mechanism comprises a movable adjusting framework, the piston is sleeved on the outer periphery of the adjusting framework and connected with the adjusting framework, and the adjusting framework can be folded towards the direction close to the central axis of the piston and unfolded away from the direction close to the central axis of the piston.

In the technical scheme, the maximum outer diameter of the piston is adjusted by arranging the adjusting mechanism connected with the piston, so that the piston structure can be matched with various cylinders with different inner diameter sizes for use, and the universality of the piston structure is improved; in the moving process of the piston, the matching state between the piston and the cylinder body can be changed by adjusting the maximum outer diameter of the piston, so that the friction between the piston and the cylinder body can be reduced, the abrasion of a piston structure is reduced, and the service life of the piston structure is prolonged; through making adjustment mechanism include mobilizable regulation skeleton, and establish the piston cover at the periphery side of adjusting the skeleton and be connected with adjusting the skeleton, adjustment mechanism adjusts the biggest external diameter of piston through the receipts of adjusting the skeleton or expansion degree for the adjustment mode of the biggest external diameter of piston is simple high-efficient, and adjusts the receipts of skeleton and expansion degree and nimble and be convenient for control, thereby makes nimble and be convenient for control to the regulation of the biggest external diameter of piston, makes the size of the biggest external diameter that the piston can have also more various.

In some embodiments, the adjusting mechanism comprises an adjusting rod, the adjusting skeleton is connected with one end of the adjusting rod, and the adjusting rod is movable along the axial direction of the piston so as to drive the adjusting skeleton to move.

In the technical scheme, the adjusting rod is arranged, and the adjusting framework is connected with one end of the adjusting rod, so that the adjusting rod can transmit power to the adjusting framework, the folding and unfolding of the adjusting framework can be controlled by moving the adjusting rod, the operation is simpler, and the labor-saving operation can be realized; when the piston structure is arranged in the cylinder body for use, the maximum outer diameter of the piston can be adjusted from the outside of the cylinder body through the adjusting rod, so that the maximum outer diameter of the piston can be conveniently adjusted.

In some embodiments, the adjusting skeleton comprises a plurality of skeleton bars arranged at intervals along the circumferential direction of the piston, one end of each skeleton bar is movably connected with one end of the piston away from the adjusting rod, and the other end of each skeleton bar is movably connected with one end of the adjusting rod.

In the above technical scheme, the adjusting framework comprises a plurality of framework rods which are arranged at intervals along the circumferential direction of the piston, and when the piston is driven to move through folding or unfolding movement, the plurality of framework rods which are arranged at intervals along the circumferential direction of the piston enable all parts of the piston in the circumferential direction to move towards the central axis direction far away from or close to the piston, so that the maximum outer diameter of the piston can be changed. Through making the one end of skeleton pole and the one end swing joint of keeping away from the regulation pole of piston, but the other end of skeleton pole and the one end swing joint of adjusting the pole, avoid adjusting the pole and drive the motion of regulation skeleton and adjust the dead phenomenon of skeleton drive piston motion's in-process appearance card.

In some embodiments, one end of the piston far away from the adjusting rod is provided with a plurality of first connecting columns, the first connecting columns are arranged at intervals along the circumferential direction of the piston, one end of the adjusting rod near the piston is provided with a plurality of second connecting columns, and the second connecting columns are arranged at intervals along the circumferential direction of the adjusting rod; one end of each framework rod is provided with a first lantern ring, the first lantern ring is sleeved on the first connecting column, the other end of each framework rod is provided with a second lantern ring, and the second lantern ring is sleeved on the second connecting column.

In the above technical scheme, through setting up a plurality of first spliced poles at the one end that the piston kept away from the regulation pole along circumference interval to and set up a plurality of second spliced poles at the one end that the regulation pole is adjacent to the piston along circumference interval, a plurality of first spliced poles and a plurality of second spliced poles correspond the setting with a plurality of hack levers of adjusting the skeleton, make a plurality of hack levers connect in the piston through first spliced pole, a plurality of hack levers connect in the regulation pole through the second spliced pole. Through set up first lantern ring and second lantern ring respectively at the both ends of skeleton pole to make first lantern ring cover locate first spliced pole, make second lantern ring cover locate the second spliced pole, make the relation of connection between skeleton pole and the piston and between skeleton pole and the regulation pole simple and stable.

In some embodiments, the adjustment mechanism comprises: the driving component is connected with the other end of the adjusting rod to drive the adjusting rod to move, and the driving component comprises a driving cylinder or a driving motor.

In the technical scheme, the driving part is arranged and can provide power for the adjusting rod connected with the driving part to drive the adjusting rod to move, so that the adjusting rod can transmit power to the adjusting framework, and then the adjusting framework transmits power to the piston. The movement of the adjusting mechanism is automated by the driving means comprising a driving cylinder or a driving motor.

In some embodiments, the piston structure includes a push rod connected to one side of the piston in the axial direction and extending in the axial direction of the piston, a guide channel extending in the extending direction of the push rod is formed in the push rod, and the adjusting rod is disposed through the guide channel and is movable in the extending direction of the guide channel.

In the technical scheme, the guide channel is formed in the push rod and the adjusting rod penetrates through the guide channel, and the guide channel plays a guide role in the movement of the adjusting rod, so that the adjusting rod moves along the extending direction of the guide channel, and the adjusting rod can stably transmit power to the adjusting framework to drive the adjusting framework to move.

In some embodiments, a limiting protrusion is formed at one end of the adjusting rod, which is far away from the piston, and the limiting protrusion is disposed on the outer circumferential wall of the adjusting rod, so as to limit the adjusting rod in the extending direction of the push rod.

In the above technical scheme, through setting up spacing arch at the periphery wall of adjusting the pole, when adjusting the pole and moving along the extending direction of the direction passageway of push rod, spacing arch can be used to restrict the relative position of adjusting pole and push rod, avoids adjusting the pole by whole pushing into the direction passageway in, can be used to restrict the amount of movement of adjusting the pole, avoids adjusting the pole and causes the skeleton pole to warp even damage when driving the skeleton pole motion.

In some embodiments, the piston is cone-shaped or straight-shaped.

In the technical scheme, the piston is in the cone shape, the part with the maximum outer diameter of the piston is positioned at one end of the piston, and the end of the piston is adjusted when the maximum outer diameter is adjusted through the adjusting mechanism, so that the adjusting difficulty is small, and the maximum outer diameter size of the piston is easier to adjust and control. And the piston is in a cone shape, so that the contact area between the piston and the inner wall of the cylinder body is smaller in the working process, and the abrasion of the piston is smaller.

In some embodiments, the piston structure includes a push rod connected to one side of the piston in the axial direction and extending in the axial direction of the piston, the push rod being connected to a small end of the piston.

During operation of the piston structure, the end of the piston having the largest outer diameter is typically the working end for transmitting the power received by the piston. Through making the tip of push rod and piston be connected for the tip of piston can receive the power from the push rod, and go out the power transmission through the one end that has the biggest external diameter of piston, set up like this and make the relative position overall arrangement of piston and push rod reasonable, and the push rod can not prevent the piston to carry out power transmission.

In some embodiments, the piston is an elastomer.

In the technical scheme, the piston is made of the elastic body, so that the piston has better elasticity, and the piston moves towards the direction close to or far away from the central axis of the piston along with the movement of the adjusting mechanism more easily, so that the maximum outer diameter of the piston is adjusted more easily.

In some embodiments, the piston is a polyethylene.

In the technical scheme, the piston is made of the polyethylene piece, and the polyethylene piece has good elasticity and wear resistance, so that when the piston needs to form an interference fit sealing effect with the cylinder body in the cylinder body, the sealing effect between the piston and the inner wall of the cylinder body is good; and in the process of moving the piston relative to the cylinder body, the piston can be worn, and the wear resistance of the polyethylene piece is good, so that the wear degree of the piston can be reduced, and the service life of the piston can be prolonged.

In a second aspect, an embodiment of the present utility model provides a glue discharging mechanism, including: the cylinder body is provided with a containing cavity, a glue outlet and a glue inlet, wherein the glue outlet and the glue inlet are suitable for being communicated with the containing cavity, and the containing cavity is used for containing glue; in the piston structure according to the embodiment of the first aspect of the present utility model, the piston is reciprocally disposed in the accommodating chamber.

In the technical scheme, the piston structure is arranged and can be arranged in the accommodating cavity of the glue discharging mechanism in a reciprocating manner, so that the piston can be used as a power transmission device for pushing glue in the glue discharging mechanism to discharge glue; and the maximum external diameter of the piston can be adjusted by the adjusting mechanism of the piston structure, so that the friction between the piston and the cylinder body in the working process is reduced by adjusting the maximum external diameter of the piston, the abrasion to the piston structure is reduced, the service life of the piston structure is prolonged, and the service life of the glue discharging mechanism is also prevented from being short due to the fact that the piston structure is damaged and is inconvenient to replace.

In some embodiments, the glue out mechanism has a glue out state and a glue in-up state, the maximum outer diameter of the piston in the glue in-up state being smaller than the maximum outer diameter of the piston in the glue out state.

In the technical scheme, when the glue outlet mechanism is in a glue outlet state, the piston moves towards the direction adjacent to the glue outlet, and the piston pushes glue in the accommodating cavity to flow towards the glue outlet and the glue outlet is used for discharging glue; when the glue supplementing state is adopted, the piston moves towards the direction away from the glue outlet, glue supplementing is conveniently carried out in the accommodating cavity, and the piston is conveniently moved towards the direction adjacent to the glue outlet again after glue supplementing is completed in the accommodating cavity.

In the play gluey state of play gluey mechanism, the biggest external diameter of piston is increased through adjustment mechanism's biggest external diameter adjustment piston to improve the sealed effect between piston and the inner wall that holds the chamber, reduce and push away gluey in-process piston and hold the leak gum that takes place between the inner wall in chamber, make and hold the intracavity gluey all to follow out the glue outlet outflow, reduce the gluey volume of remaining in the play gluey mechanism.

When the glue outlet mechanism is in a glue supplementing state, the maximum outer diameter of the piston is reduced by adjusting the maximum outer diameter of the piston through the adjusting mechanism, so that the friction force between the piston and the inner wall of the containing cavity can be reduced, the abrasion of the piston relative to the cylinder body during movement can be reduced, and the service life of the piston is prolonged.

In a third aspect, an embodiment of the present utility model provides a glue spreading apparatus, including: the glue outlet mechanism of the embodiment of the second aspect of the utility model.

In the technical scheme, through setting up foretell play gum machine construct, can reduce the wearing and tearing to the piston of play gum machine constructs to be favorable to prolonging the life of play gum machine construct and rubber coating equipment, and be favorable to reducing the maintenance frequency of rubber coating equipment.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic perspective view of a piston structure according to some embodiments of the present utility model;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

FIG. 4 is an exploded schematic view of the piston structure of FIG. 1;

fig. 5 is an enlarged view at C in fig. 4;

FIG. 6 is an enlarged view at D in FIG. 4;

FIG. 7 is a side view of the piston structure of FIG. 1;

FIG. 8 is a front view of the piston structure of FIG. 1;

FIG. 9 is a side view of the piston of FIG. 1;

fig. 10 is a schematic perspective view of a glue dispensing mechanism according to some embodiments of the utility model.

Reference numerals:

100. a piston structure;

1. a piston; 11. a first connection post; 12. a first end; 13. a second end; 14. a first connection portion;

2. a push rod; 21. a guide channel; 22. a third end; 23. a fourth end; 24. a second connecting portion;

3. an adjusting mechanism; 31. adjusting a framework; 311. a bone frame rod; 3111. a first collar; 3112. a second collar; 32. an adjusting rod; 321. a second connection post; 322. a limit protrusion;

200. a glue discharging mechanism;

10. a glue outlet;

20. a cylinder body.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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 present application. 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.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The piston structure is used as a common power transmission structure, and is used for power transmission by reciprocating in the cylinder body, and can be widely applied to the fields of mechanical equipment (such as gluing equipment), automobiles and the like. Some piston structures have various pneumatic and hydraulic systems as power sources; some piston structures are used as glue pushing pieces of the glue discharging mechanism, and the power sources of the piston structures can be manually pushed or electrically pushed.

In the related art, a piston structure is generally disposed in a cylinder, and the piston structure can reciprocate relative to the cylinder. However, the piston structure and the cylinder body which are usually matched are required to meet the requirement that the outer diameter size of the piston structure is basically consistent with the inner diameter size of the cylinder body, so that the piston structure can be tightly matched with the cylinder body, the piston structure with the same specification size cannot be matched with a plurality of cylinder bodies with different inner diameter sizes, and the universality of the piston structure is poor; and in the reciprocating motion process of the piston structure relative to the cylinder body, the close fit of the piston structure and the cylinder body can enable the mutual friction between the piston structure and the inner wall of the cylinder body to be large, so that the abrasion of the piston structure is easy to cause, and the service life of the piston structure is short.

Based on this, the applicant proposes a piston structure provided with a piston and an adjusting mechanism connected to the piston for adjusting the maximum outer diameter of the piston. In such a piston structure, the maximum outer diameter of the piston is adjusted through the adjusting mechanism, so that the maximum outer diameter of the piston can be matched with cylinders with different inner diameters for use, and the universality of the piston structure can be improved. By adjusting the maximum outer diameter of the piston, the abrasion generated by the mutual friction between the piston and the cylinder body in the moving process can be reduced by reducing the maximum outer diameter of the piston, and the service life of the piston is prolonged.

The piston structure disclosed by the embodiment of the utility model can be used for devices using the piston structure as a power transmission structure, and the devices can be, but are not limited to, a glue outlet mechanism of glue coating equipment, a braking device of an automobile, a speed changing device of the automobile, a hydraulic pump and the like.

When the piston structure is applied to the glue outlet mechanism of the glue coating equipment, the piston structure is arranged in the cylinder body of the glue outlet mechanism and can reciprocate relative to the cylinder body of the glue outlet mechanism, when the glue outlet mechanism is used for discharging glue, the piston structure can be used as a power transmission structure to push the glue in the cylinder body to be discharged, and after the glue outlet of the glue outlet mechanism is completed, the piston structure can move to return to the position of the piston structure in the cylinder body before the glue is discharged.

The glue discharging mechanism of the embodiment of the utility model can be widely applied to various production fields, such as the fields of batteries, electronic equipment, automobiles, medical appliances and the like, and the embodiment of the utility model is not limited to the fields. For example, the glue discharging mechanism can be used in the field of batteries, and the battery core, the battery cell, the battery box and the like in the field of batteries are not limited. For example, the glue discharging mechanism can be used for gluing the battery cell, so that the inside of the battery cell becomes a sealed environment. The glue discharging mechanism can also be used for connecting a plurality of electric cores, and the electric cores are adhered into a whole through glue discharged by the glue discharging mechanism, so that the collision safety of the battery cell can be improved. The glue outlet mechanism can be used for bonding the battery monomer and the box body, the glue can increase the structural strength of the battery box, the glue connected between the battery monomer and the box body can also be used as a heat conducting medium, and the glue layer plays a role in conducting heat and is used for transferring heat generated by the battery monomer to the box body and further transferring the heat to a water cooling system through the box body, so that the heat of the battery box can be dissipated.

The glue outlet mechanism of the embodiment of the utility model can also have a metering function, and the movement of the piston structure can be controlled by metering the glue in the accommodating cavity of the cylinder body of the glue outlet mechanism so as to control the glue outlet amount of the glue outlet mechanism.

A piston structure 100 according to an embodiment of the present utility model is described below with reference to fig. 1-9.

Referring to fig. 1-4, in a first aspect, an embodiment of the present utility model provides a piston structure 100 comprising: a piston 1 and an adjusting mechanism 3. The piston 1 is cylindric, and adjustment mechanism 3 is connected with piston 1 for adjust the biggest external diameter of piston 1, adjustment mechanism 3 includes mobilizable regulation skeleton 31, and piston 1 cover is established in the periphery side of regulation skeleton 31 and is connected with regulation skeleton 31, and regulation skeleton 31 can draw in towards the central axis direction that is close to piston 1 and can expand towards the central axis direction that keeps away from piston 1.

Wherein the adjustment mechanism 3 is connected to the piston 1 such that the adjustment mechanism 3 may drive the piston 1 to move to adjust the maximum outer diameter of the piston 1, the adjustment mechanism 3 may be used to increase the maximum outer diameter of the piston 1, or the adjustment mechanism 3 may be used to decrease the maximum outer diameter of the piston 1.

The maximum outer diameter of the piston 1 is the diameter of the piston 1 at the outer edge having the largest diameter when the piston 1 is not moved and is stably maintained to a certain state.

The cylindrical shape means a structure in which the inside is formed to be hollow and the cross section is annular, wherein the cross section of the cylindrical shape may be annular.

The adjusting framework 31 is folded towards the direction close to the central axis of the piston 1, so that the piston 1 connected with the adjusting framework 31 can be driven to move towards the direction close to the central axis of the piston 1, and the maximum outer diameter of the piston 1 is reduced; the expansion of the adjustment frame 31 in a direction away from the central axis of the piston 1 may drive the piston 1 connected to the adjustment frame 31 to move in a direction away from the central axis of the piston 1 to increase the maximum outer diameter of the piston 1.

Alternatively, when the piston 1 is mounted to the cylinder 20, the largest outer diameter portion of the piston 1 is fitted to the cylinder 20, for example, a portion of the piston 1 having the largest outer diameter is in contact fit with the inner wall of the cylinder 20.

When the piston structure 100 is required to be matched with the cylinders 20 with different inner diameter sizes, the maximum outer diameter size of the piston structure 100 can be adjusted according to the inner diameter size of the cylinder 20 to be matched, so that the piston 1 can be matched with the inner wall of the cylinder 20 to be matched. Specifically, the piston 1 is driven to move by the adjusting mechanism 3 so that the maximum outer diameter size of the piston 1 matches the inner diameter size of the cylinder 20 to be matched for use, and then the piston 1 is mounted to the cylinder 20 so that the maximum outer diameter portion of the cylinder 20 is in contact fit with the inner wall of the cylinder 20.

When the piston 1 is mounted to the cylinder 20 having a certain inner diameter size, the piston 1 can reciprocate with respect to the cylinder 20, and the maximum outer diameter portion of the piston 1 is in contact engagement with the inner wall of the cylinder 20, and the piston 1 is worn during the movement. When the piston 1 does not need power transmission, in order to reduce the abrasion degree of the piston 1, the adjusting mechanism 3 can drive the piston 1 to move so as to reduce the maximum outer diameter of the piston 1, so that the friction force between the maximum outer diameter part of the piston 1 and the cylinder 20 is reduced, and the abrasion of the piston 1 can be reduced; when the piston 1 needs to transmit power, the adjusting mechanism 3 can drive the piston 1 to move to increase the maximum outer diameter of the piston 1, so that the maximum outer diameter part of the piston 1 can restore to be in contact with the inner wall of the cylinder 20.

In the above technical solution, the maximum outer diameter of the piston 1 is adjusted by setting the adjusting mechanism 3 connected with the piston 1, so that the piston structure 100 can be matched with various cylinders 20 with different inner diameter sizes for use, and the universality of the piston structure 100 is improved; and in the motion process of the piston 1, the state of close fit between the piston 1 and the cylinder body 20 can be changed by adjusting the maximum outer diameter of the piston 1, so that the friction between the piston 1 and the cylinder body 20 can be reduced, the abrasion to the piston structure 100 is reduced, and the service life of the piston structure 100 is prolonged. Through making adjustment mechanism 3 include mobilizable regulation skeleton 31, and establish the periphery side at regulation skeleton 31 with piston 1 cover and be connected with regulation skeleton 31, adjustment mechanism 3 adjusts the biggest external diameter of piston 1 through the receipts of adjusting the degree of drawing in or expanding of skeleton 31 for the regulation mode of the biggest external diameter of piston 1 is simple high-efficient, and adjusts the nimble and be convenient for control of the regulation of drawing in and expanding of skeleton 31, thereby makes nimble and be convenient for control of the regulation of the biggest external diameter of piston 1, makes the size of the biggest external diameter that piston 1 can have also more various.

Referring to fig. 1-3, in some embodiments, the piston 1 is cylindrical and the adjustment mechanism 3 is configured to drive the piston 1 in a direction away from or toward the central axis of the piston 1 to adjust the maximum outer diameter of the piston 1.

Alternatively, the adjusting mechanism 3 may be used to drive the cylinder wall of the piston 1 to deform so that the piston 1 moves away from or near the central axis of the piston 1, e.g. the cylinder wall is formed by an elastic member, and the adjusting mechanism 3 may be used to drive the cylinder wall to elastically deform; for example, the cylinder wall is formed by a foldable structure, and the adjusting mechanism 3 can be used for driving the cylinder wall to be folded inwards or unfolded outwards. Alternatively, the adjusting mechanism 3 may be further configured to drive the cylinder wall of the piston 1 to move radially so that the piston 1 moves in a direction away from or close to the central axis of the piston 1.

The adjusting mechanism 3 is used for increasing the maximum outer diameter of the piston 1 when the adjusting mechanism 3 is used for driving the piston 1 to move towards the direction away from the central axis of the piston 1; the adjustment mechanism 3 is used to reduce the maximum outer diameter of the piston 1 when the adjustment mechanism 3 is used to drive the piston 1 in a direction approaching the central axis of the piston 1.

In the above technical solution, the piston 1 is driven by the adjusting mechanism 3 to move towards the direction away from the central axis of the piston 1 to increase the maximum outer diameter of the piston 1, and the piston 1 is driven by the adjusting mechanism 3 to move towards the direction close to the central axis of the piston 1 to decrease the maximum outer diameter of the piston 1, so that the purpose of adjusting the maximum outer diameter of the piston 1 can be conveniently achieved.

Referring to fig. 1-4, in some embodiments, the adjusting mechanism 3 includes an adjusting rod 32, the adjusting frame 31 is connected to one end of the adjusting rod 32, and the adjusting rod 32 is movable along the axial direction of the piston 1 to move the adjusting frame 31.

The adjusting rod 32 can be moved along the axial direction of the piston 1 to drive the adjusting framework 31 to be folded towards the direction close to the central axis of the piston 1, or the adjusting rod 32 can be moved along the axial direction of the piston 1 to drive the adjusting framework 31 to be unfolded towards the direction far away from the central axis of the piston 1. For example, the adjusting rod 32 moves along the axial direction of the piston 1 towards the direction of the end, away from the adjusting rod 32, of the piston 1, and can drive the adjusting framework 31 to be unfolded towards the direction away from the central axis of the piston 1; the adjusting rod 32 moves along the axial direction of the piston 1 towards the direction away from one end of the piston 1 away from the adjusting rod 32, so that the adjusting framework 31 can be driven to retract towards the central axis direction close to the piston 1.

In the above technical solution, by arranging the adjusting rod 32 and connecting the adjusting frame 31 with one end of the adjusting rod 32, the adjusting rod 32 can transmit power to the adjusting frame 31, and the adjusting frame 31 can be controlled to be folded and unfolded by moving the adjusting rod 32, so that the operation is simpler and the labor-saving operation can be realized; when the piston structure 100 is disposed in the cylinder 20 for use, the maximum outer diameter of the piston 1 can be adjusted from the outside of the cylinder 20 by providing the adjusting rod 32, so that the maximum outer diameter of the piston 1 can be adjusted conveniently.

Referring to fig. 1-7, in some embodiments, the adjusting skeleton 31 includes a plurality of skeleton bars 311 disposed at intervals along the circumferential direction of the piston 1, one end of each skeleton bar 311 is movably connected to one end of the piston 1 remote from the adjusting bar 32, and the other end of each skeleton bar 311 is movably connected to one end of the adjusting bar 32.

For example, when the adjusting rod 32 moves along the extending direction of the guide channel 21 toward the direction approaching the piston 1, the adjusting rod 32 first drives the other end of the frame rod 311 to move toward the end of the piston 1 away from the adjusting rod 32, so that the adjusting frame 31 expands toward the direction away from the central axis of the piston 1, and then one end of the frame rod 311 drives the piston 1 to move toward the direction away from the central axis of the piston 1, so that the maximum outer diameter of the piston 1 increases.

For example, when the adjusting rod 32 moves along the extending direction of the guide channel 21 toward the direction away from the piston 1, the adjusting rod 32 first drives the other end of the frame rod 311 to move toward the end of the piston 1 close to the adjusting rod 32, so that the adjusting frame 31 is folded toward the direction close to the central axis of the piston 1, and then one end of the frame rod 311 drives the piston 1 to move toward the direction close to the central axis of the piston 1, so that the maximum outer diameter of the piston 1 is reduced.

In the above-mentioned technical solution, by making the adjusting skeleton 31 include a plurality of skeleton bars 311 that are disposed at intervals along the circumferential direction of the piston 1, when the adjusting skeleton 31 drives the piston 1 to move by the collapsing or expanding movement, the plurality of skeleton bars 311 that are disposed at intervals along the circumferential direction of the piston 1 make each portion of the piston 1 in the circumferential direction movable toward the direction away from or toward the central axis of the piston 1, so that the maximum outer diameter of the piston 1 can be changed. Through making skeleton pole 311 one end and the one end swing joint that keeps away from regulation pole 32 of piston 1, but the other end and the one end swing joint of regulation pole 32 of skeleton pole 311, avoid adjusting pole 32 and drive the motion of regulation skeleton 31 and adjust the dead phenomenon of skeleton 31 drive piston 1 in-process appearance card.

Referring to fig. 2-7, in some embodiments, an end of the piston 1 remote from the adjustment rod 32 is provided with a plurality of first connection posts 11, the plurality of first connection posts 11 are disposed at intervals along the circumferential direction of the piston 1, an end of the adjustment rod 32 adjacent to the piston 1 is provided with a plurality of second connection posts 321, and the plurality of second connection posts 321 are disposed at intervals along the circumferential direction of the adjustment rod 32. One end of each frame rod 311 is provided with a first collar 3111, the first collar 3111 is sleeved on the first connecting post 11, the other end of each frame rod 311 is provided with a second collar 3112, and the second collar 3112 is sleeved on the second connecting post 321.

In the above technical solution, by arranging the plurality of first connecting posts 11 at intervals along the circumferential direction at the end of the piston 1 far from the adjusting rod 32 and arranging the plurality of second connecting posts 321 at intervals along the circumferential direction at the end of the adjusting rod 32 near the piston 1, the plurality of first connecting posts 11 and the plurality of second connecting posts 321 are correspondingly arranged with the plurality of frame posts 311 of the adjusting skeleton 31, so that the plurality of frame posts 311 are connected to the piston 1 through the first connecting posts 11, and the plurality of frame posts 311 are connected to the adjusting rod 32 through the second connecting posts 321. By providing the first collar 3111 and the second collar 3112 at the two ends of the skeleton rod 311, respectively, and by sleeving the first collar 3111 on the first connecting post 11 and sleeving the second collar 3112 on the second connecting post 321, the connection between the skeleton rod 311 and the piston 1 and between the skeleton rod 311 and the adjusting rod 32 is simple.

In some embodiments, the adjustment mechanism 3 includes a driving member connected to the other end of the adjustment lever 32 to drive the movement of the adjustment lever 32, the driving member including a driving cylinder or a driving motor.

In the above technical solution, by providing the driving component, the driving component can provide power for the adjusting rod 32 connected with the driving component to drive the adjusting rod 32 to move, so that the adjusting rod 32 can transmit power to the adjusting framework 31, and then transmit power to the piston 1 through the adjusting framework 31. The movement of the adjustment mechanism 3 is automated by the drive means comprising a drive cylinder or a drive motor.

Referring to fig. 4, in some embodiments, the piston structure 100 includes a push rod 2, the push rod 2 is connected to one side of the piston 1 in the axial direction and extends in the axial direction of the piston 1, a guide channel 21 extending in the extending direction of the push rod 2 is formed in the push rod 2, and an adjusting rod 32 is provided to penetrate the guide channel 21 and is movable in the extending direction of the guide channel 21.

In the above technical solution, by forming the guide channel 21 in the push rod 2 and threading the adjusting rod 32 in the guide channel 21, the guide channel 21 forms a guiding effect on the movement of the adjusting rod 32, so that the adjusting rod 32 moves along the extending direction of the guide channel 21, and the adjusting rod 32 can stably transmit power to the adjusting frame 31 to drive the adjusting frame 31 to move.

Referring to fig. 8, in some embodiments, a limiting protrusion 322 is formed at an end of the adjustment lever 32 remote from the piston 1, and the limiting protrusion 322 is provided at an outer circumferential wall of the adjustment lever 32 to limit the adjustment lever 32 in the extending direction of the push rod 2.

In the above technical solution, by arranging the limiting protrusion 322 on the outer circumferential wall of the adjusting rod 32, when the adjusting rod 32 moves along the extending direction of the guide channel 21 of the push rod 2, the limiting protrusion 322 can be used for limiting the relative position of the adjusting rod 32 and the push rod 2, so as to prevent the adjusting rod 32 from being integrally pushed into the guide channel 21, and can be used for limiting the moving amount of the adjusting rod 32, so as to prevent the adjusting rod 32 from causing deformation or even damage of the bone frame rod 311 when driving the bone frame rod 311 to move.

Referring to fig. 1-7, in some embodiments, the piston 1 is cone-shaped or straight-cylindrical.

Wherein the cone-shaped cylinder has one end and the other end in the axial direction of the piston 1, and the size of the maximum outer diameter of the piston 1 gradually increases or decreases in a direction from the one end of the cone-shaped cylinder toward the other end of the cone-shaped cylinder.

The straight cylinder has one end and the other end along the axial direction of the piston 1, and the maximum outer diameter dimension of the piston 1 is unchanged in the direction from the one end of the straight cylinder toward the other end of the straight cylinder.

In the above technical scheme, the piston 1 is in a conical cylinder shape or a straight cylinder shape, so that the piston is simple in structure and easy to process and manufacture. By making the piston 1 in a cone shape, the part of the piston 1 with the largest outer diameter is positioned at one end of the piston 1, and the end of the piston 1 is adjusted when the largest outer diameter is adjusted by the adjusting mechanism 3, so that the adjusting difficulty is small, and the maximum outer diameter size of the piston 1 is easier to adjust and control. And the piston 1 has a conical cylindrical shape so that the contact area of the piston 1 with the inner wall of the cylinder 20 is also small during operation, thereby causing less wear of the piston 1.

Referring to fig. 8-9, in some embodiments, the piston structure 100 includes a push rod 2, the push rod 2 being connected to one axial side of the piston 1 and extending in the axial direction of the piston 1, the push rod 2 being connected to a small end of the piston 1.

During operation of the piston structure 100, the end of the piston 1 having the largest outer diameter is typically the working end for transmitting the power received by the piston 1. Through making push rod 2 be connected with the tip of piston 1 for the tip of piston 1 can receive the power from push rod 2, and goes out the power transmission through the one end that has the biggest external diameter of piston 1, sets up like this and makes the relative position overall arrangement of piston 1 and push rod 2 reasonable, and push rod 2 can not prevent piston 1 to carry out power transmission.

Referring to fig. 9, in some embodiments, the piston 1 is an elastomer.

Alternatively, the elastomer may be a polymer elastomer, which may be a thermosetting elastomer or a thermoplastic elastomer; the elastic body may be an inorganic elastic body having elasticity, for example, an elastic body formed of silica gel.

In the above technical solution, the piston 1 is made of an elastomer, so that the piston 1 has better elasticity, and the piston 1 is easier to move along with the movement of the adjusting mechanism 3 towards the direction close to or away from the central axis of the piston 1, so that the maximum outer diameter of the piston 1 is easier to be adjusted.

Referring to fig. 9, in some embodiments, the piston 1 is a polyethylene member.

In the above technical solution, the piston 1 is made of a polyethylene piece, which has good elasticity and wear resistance, so that when the piston 1 needs to form an interference fit sealing effect with the cylinder 20 in the cylinder 20, the sealing effect between the piston 1 and the inner wall of the cylinder 20 is good; and in the process of moving the piston 1 relative to the cylinder body 20, the piston 1 can be worn, and the wear resistance of the polyethylene piece is better, so that the wear degree of the piston 1 can be reduced, and the service life of the piston 1 can be prolonged.

Referring to fig. 10, in a second aspect, an embodiment of the present utility model provides a glue discharging mechanism 200, including: the cylinder 20 and the piston structure 100 are provided, the cylinder 20 is provided with a containing cavity, a glue outlet 10 and a glue inlet, the glue outlet 10 and the glue inlet are suitable for being communicated with the containing cavity, the containing cavity is used for containing glue, and the piston 1 is arranged in the containing cavity in a reciprocating mode.

In the above technical solution, by providing the above piston structure 100 and arranging the piston structure 100 in the accommodating cavity of the glue discharging mechanism 200 in a manner of being capable of reciprocating, the piston 1 can be used as a power transmission device for pushing the glue in the glue discharging mechanism 200 to discharge the glue; and the adjustment mechanism 3 of the piston structure 100 can be used for adjusting the maximum outer diameter of the piston 1, and the friction between the piston 1 and the cylinder body 20 is reduced in the working process by adjusting the maximum outer diameter of the piston 1, so that the abrasion to the piston structure 100 is reduced, the service life of the piston structure 100 is prolonged, and the service life of the glue discharging mechanism 200 is also prevented from being shorter due to the fact that the piston structure 100 is damaged and is inconvenient to replace.

Referring to fig. 10, in some embodiments, the glue dispensing mechanism 200 has a glue dispensing state and a glue replenishment state, and the maximum outer diameter of the piston 1 in the glue replenishment state is smaller than the maximum outer diameter of the piston 1 in the glue dispensing state.

In the glue outlet state, the piston 1 moves towards the direction adjacent to the glue outlet 10, and in the glue supplementing state, the piston 1 moves towards the direction far away from the glue outlet 10.

When the glue discharging mechanism 200 is in a glue discharging state, the driving mechanism of the adjusting mechanism 3 provides power to drive the adjusting rod 32 to move along the extending direction of the guide channel 21 of the push rod 2 towards the direction close to the piston 1 (shown in the direction e1 in fig. 10), the adjusting rod 32 drives the adjusting framework 31 to be unfolded towards the direction far away from the central axis of the piston 1, the adjusting framework 31 drives the piston 1 to move towards the direction far away from the central axis of the piston 1, so that the maximum outer diameter of the piston 1 is increased, the maximum outer diameter of the piston 1 is basically consistent with the inner diameter of the accommodating cavity of the glue discharging mechanism 200, and when the piston 1 moves towards the direction close to the glue discharging opening 10, the piston 1 pushes glue in the accommodating cavity towards the glue discharging opening 10, so that the glue in the accommodating cavity is discharged through the glue discharging opening 10.

When the glue outlet mechanism 200 is in a glue supplementing state, the driving mechanism of the adjusting mechanism 3 provides power to drive the adjusting rod 32 to move along the extending direction of the guide channel 21 of the push rod 2 towards the direction away from the piston 1 (shown in the e2 direction in fig. 10), the adjusting rod 32 drives the adjusting framework 31 to be unfolded towards the direction close to the central axis of the piston 1, the adjusting framework 31 drives the piston 1 to move towards the direction close to the central axis of the piston 1, the maximum outer diameter of the piston 1 is reduced, and therefore the maximum outer diameter of the piston 1 is smaller than the inner diameter of the accommodating cavity of the glue outlet mechanism 200, and when the piston 1 moves towards the direction away from the glue outlet 10, no contact exists between the piston 1 and the inner wall of the accommodating cavity, so that abrasion on the piston 1 can be reduced.

In the above technical solution, in the glue outlet state of the glue outlet mechanism 200, the piston 1 moves towards the direction adjacent to the glue outlet 10, and the piston 1 pushes the glue in the accommodating cavity to flow towards the glue outlet 10 and to be discharged from the glue outlet 10; when in the glue supplementing state, the piston 1 moves towards the direction away from the glue outlet 10, so that glue supplementing is carried out in the accommodating cavity, and the piston 1 is convenient to move towards the direction adjacent to the glue outlet 10 again after glue supplementing is completed in the accommodating cavity.

In the glue outlet state of the glue outlet mechanism 200, the maximum outer diameter of the piston 1 is increased by adjusting the maximum outer diameter of the piston 1 through the adjusting mechanism 3, so that the sealing effect between the piston 1 and the inner wall of the containing cavity is improved, glue leakage occurring between the piston 1 and the inner wall of the containing cavity in the glue pushing process is reduced, glue in the containing cavity can flow out from the glue outlet 10, and the residual glue amount in the glue outlet mechanism 200 is reduced.

In the glue feeding state of the glue discharging mechanism 200, the maximum outer diameter of the piston 1 is reduced by adjusting the maximum outer diameter of the piston 1 through the adjusting mechanism 3, so that the friction force between the piston 1 and the inner wall of the accommodating cavity can be reduced, the abrasion of the piston 1 during the movement relative to the cylinder body 20 can be reduced, and the service life of the piston 1 can be prolonged.

In a third aspect, an embodiment of the present utility model provides a glue spreading apparatus, including: the glue discharging mechanism 200 according to the second embodiment of the present utility model.

In the above technical solution, by setting the glue discharging mechanism 200, the abrasion to the piston 1 of the glue discharging mechanism 200 can be reduced, thereby being beneficial to prolonging the service lives of the glue discharging mechanism 200 and the glue spreading equipment and reducing the maintenance frequency of the glue spreading equipment.

A piston structure 100 according to some embodiments of the present utility model is described below with reference to fig. 1-9.

In the present embodiment, the piston structure 100 applied to the glue discharging mechanism 200 is described as an example. The glue discharging mechanism 200 comprises a piston 1, a push rod 2 and an adjusting mechanism 3, wherein the push rod 2 is connected to one side of the piston 1 along the axial direction, and the adjusting mechanism 3 is also connected with the piston 1 for adjusting the maximum outer diameter of the piston 1.

The piston 1 is formed in a cone shape, the piston 1 has a first end 12 and a second end 13 in an axial direction, a small end of the piston 1 is the first end 12, a large end of the piston 1 is the second end 13, the first end 12 of the piston 1 is also provided with a first connecting portion 14, the first connecting portion 14 is formed in a tube shape, the first connecting portion 14 is used for connecting the piston 1 to the push rod 2, and the first connecting portion 14 is located in the push rod 2. The push rod 2 extends along the axial direction of the piston 1, the push rod 2 is provided with a third end 22 and a fourth end 23 in the extending direction, the third end 22 of the push rod 2 is provided with a second connecting part 24, the second connecting part 24 is formed into a cone shape, the taper of the second connecting part 24 is consistent with that of the piston 1, the second connecting part 24 is used for connecting the push rod 2 to the piston 1, and the second connecting part 24 is positioned outside the first end 12 of the piston 1. The second end 13 of the piston 1 is provided with four first connecting posts 11, and the four first connecting posts 11 are arranged at intervals along the circumferential direction of the piston 1.

The adjusting mechanism 3 includes a driving part, an adjusting lever 32, and an adjusting frame 31, the adjusting lever 32 having one end and the other end in the extending direction thereof, one end of the adjusting lever 32 being adjacent to the piston 1, the other end of the adjusting lever 32 being distant from the piston 1. One end of the adjusting rod 32 is provided with four second connecting columns 321, and the four second connecting columns 321 are arranged at intervals along the circumferential direction of the adjusting rod 32, the other end of the adjusting rod 32 is connected to a driving component, and the driving component can drive the adjusting rod 32 to move.

The adjusting skeleton 31 includes four skeleton bars 311, the skeleton bars 311 have one end and the other end along its own extending direction, one end of the skeleton bars 311 is provided with a first collar 3111, the other end of the skeleton bars 311 is provided with a second collar 3112, the first collar 3111 is movably connected to the first connecting post 11, the second collar 3112 is movably connected to the second connecting post 321, thereby the four skeleton bars 311 are respectively correspondingly connected to the four first connecting posts 11 and to the four second connecting posts 321, then one end of the four skeleton bars 311 is connected to the second end 13 of the piston 1 along the circumferential direction of the piston 1, and the other end of the four skeleton bars 311 is connected to one end of the adjusting rod 32 along the circumferential direction of the adjusting rod 32.

A guide channel 21 extending along the extending direction of the push rod 2 is formed in the push rod 2, an adjusting rod 32 is arranged in the guide channel 21 in a penetrating manner, the push rod 2 is provided with one end and the other end along the extending direction, one end of the push rod 2 is adjacent to the piston 1 and connected with the first end 12 of the piston 1, one end of the push rod 2 is also adjacent to one end of the adjusting rod 32, and the other end of the push rod 2 is far away from the piston 1 and is adjacent to the other end of the adjusting rod 32. The other end of the adjusting lever 32 is provided with a limit projection 322 for limiting the relative position of the adjusting lever 32 and the push rod 2 in the extending direction of the push rod 2, and the limit projection 322 is farther from the piston 1 with respect to the other end of the push rod 2.

The driving part can drive the adjusting rod 32 to move in the guide channel 21 along the extending direction of the guide channel 21, so that the adjusting rod 32 can drive the adjusting framework 31 to be folded towards the direction approaching the central axis of the piston 1 or drive the adjusting framework 31 to be unfolded towards the direction far away from the central axis of the piston 1. When the adjusting framework 31 is folded towards the direction close to the central axis of the piston 1, the piston 1 is driven to move towards the direction close to the central axis of the piston 1, so that the maximum outer diameter of the piston 1 is reduced; when the adjusting skeleton 31 expands in a direction away from the central axis of the piston 1, the piston 1 is moved in a circumferential direction away from the center of the piston 1, so as to increase the maximum outer diameter of the piston 1.

When the piston structure 100 is applied to the glue outlet mechanism 200, in the glue outlet state of the glue outlet mechanism 200, the piston structure 100 needs to increase the maximum outer diameter to enable the piston 1 and the inner wall of the accommodating cavity of the glue outlet mechanism 200 to be in an interference sealing state, so that glue in the glue outlet mechanism 200 can be discharged through the glue outlet 10 as much as possible. The process of increasing the maximum outer diameter of the piston 1 is as follows: the driving part of the adjusting mechanism 3 drives the adjusting rod 32 to move in the guide channel 21 along the extending direction of the guide channel 21 towards the direction close to the second end 13 of the piston 1, the second connecting post 321 of the adjusting rod 32 drives the adjusting framework 31 to be unfolded towards the direction far away from the central axis of the piston 1 through the second collar 3112 of the framework rod 311, the first collar 3111 of the framework rod 311 drives the piston 1 to move towards the direction far away from the central axis of the piston 1 through the first connecting post 11, and the maximum outer diameter of the piston 1 is increased to a state that the piston 1 is in interference sealing with the inner wall of the accommodating cavity of the glue discharging mechanism 200. Then, the piston 1 is pushed by the push rod 2 to move towards the direction adjacent to the glue outlet 10, and the glue in the accommodating cavity of the glue outlet mechanism 200 is pushed by the piston 1 to be discharged through the glue outlet 10.

In the glue supplementing state of the glue discharging mechanism 200, the piston structure 100 needs to return to the position before the glue discharging of the glue discharging mechanism 200 under the driving of the push rod 2, and in order to reduce the abrasion of the piston 1 in the process of returning to the position before the glue discharging, the maximum outer diameter of the piston 1 needs to be reduced by the adjusting mechanism 3 so that the piston 1 is in a non-contact state with the inner wall of the accommodating cavity. The process of reducing the maximum outer diameter of the piston 1 is as follows: the driving part of the adjusting mechanism 3 drives the adjusting rod 32 to move in the guide channel 21 along the extending direction of the guide channel 21 towards the direction away from the second end 13 of the piston 1, the second connecting post 321 of the adjusting rod 32 drives the adjusting framework 31 to be folded towards the direction close to the central axis of the piston 1 through the second collar 3112 of the framework rod 311, the first collar 3111 of the framework rod 311 drives the piston 1 to move towards the direction close to the central axis of the piston 1 through the first connecting post 11, and the maximum outer diameter of the piston 1 is increased and reduced until the piston 1 is in a non-contact state with the inner wall of the accommodating cavity of the glue discharging mechanism 200. Then, the push rod 2 drives the piston 1 to move towards a direction away from the glue outlet 10, so that the piston structure 100 returns to a position before the glue outlet of the glue outlet mechanism 200.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (13)

1. A piston structure, comprising:

a piston having a cylindrical shape;

the adjusting mechanism is connected with the piston and used for adjusting the maximum outer diameter of the piston, the adjusting mechanism comprises a movable adjusting framework, the piston is sleeved on the outer periphery of the adjusting framework and connected with the adjusting framework, and the adjusting framework can be folded towards the direction close to the central axis of the piston and unfolded away from the direction close to the central axis of the piston.

2. The piston structure of claim 1, wherein the adjustment mechanism comprises an adjustment rod, the adjustment frame being connected to one end of the adjustment rod, the adjustment rod being movable in an axial direction of the piston to move the adjustment frame.

3. The piston structure of claim 2, wherein the adjusting skeleton comprises a plurality of skeleton bars arranged at intervals along the circumferential direction of the piston, one end of each skeleton bar is movably connected with one end of the piston away from the adjusting rod, and the other end of each skeleton bar is movably connected with one end of the adjusting rod.

4. The piston structure according to claim 3, wherein one end of the piston, which is far away from the adjusting rod, is provided with a plurality of first connecting columns, the plurality of first connecting columns are arranged at intervals along the circumferential direction of the piston, one end of the adjusting rod, which is near to the piston, is provided with a plurality of second connecting columns, and the plurality of second connecting columns are arranged at intervals along the circumferential direction of the adjusting rod;

one end of each framework rod is provided with a first lantern ring, the first lantern ring is sleeved on the first connecting column, the other end of each framework rod is provided with a second lantern ring, and the second lantern ring is sleeved on the second connecting column.

5. The piston structure of claim 2 wherein said adjustment mechanism comprises: the driving component is connected with the other end of the adjusting rod to drive the adjusting rod to move, and the driving component comprises a driving cylinder or a driving motor.

6. The piston structure according to claim 2, comprising a push rod connected to one side of the piston in the axial direction and extending in the axial direction of the piston, a guide passage extending in the extending direction of the push rod being formed in the push rod, and the adjusting rod being provided to pass through the guide passage and being movable in the extending direction of the guide passage.

7. The piston structure of claim 6, wherein a limiting protrusion is formed at an end of the adjusting rod, which is far from the piston, and the limiting protrusion is provided at an outer circumferential wall of the adjusting rod to limit the adjusting rod in an extending direction of the push rod.

8. The piston structure of claim 1, wherein the piston is cone-shaped or straight-shaped.

9. The piston structure of claim 8, including a pushrod connected to one side of the piston in the axial direction and extending in the axial direction of the piston, the pushrod connected to a small end of the piston.

10. The piston structure of any one of claims 1-9, wherein the piston is an elastomer.

11. The utility model provides a play gluey mechanism which characterized in that includes:

the cylinder body is provided with a containing cavity, a glue outlet and a glue inlet, wherein the glue outlet and the glue inlet are suitable for being communicated with the containing cavity, and the containing cavity is used for containing glue;

the piston structure according to any one of claims 1 to 10, the piston being reciprocally disposed within the accommodation chamber.

12. The glue dispensing mechanism of claim 11, wherein the glue dispensing mechanism has a glue dispensing state and a glue replenishment state, wherein a maximum outer diameter of the piston in the glue replenishment state is less than a maximum outer diameter of the piston in the glue dispensing state.

13. A gumming device, characterized by comprising: glue dispensing mechanism according to claim 11 or 12.