CN110360078B - Metering pump for ensuring stable liquid-material mixing proportion - Google Patents

Abstract

The invention provides a metering pump for ensuring the stable mixing proportion of liquid materials, which comprises a cylinder body and a piston assembly, wherein the cylinder body comprises a fixed cylinder and a cylinder body moving plate, and a cylinder body opening, a liquid inlet and a liquid outlet are formed on the fixed cylinder; the cylinder body moving plate is arranged at the opening of the cylinder body in a sliding way and forms a cylinder body space together with the fixed cylinder; the piston assembly comprises an actuating plate and a piston telescopic piece, the actuating plate is slidably arranged on the fixed cylinder, and the piston telescopic piece is connected with the actuating plate and is in sliding contact with the fixed cylinder and the cylinder moving plate so as to form a closed space for containing liquid materials in the cylinder space. The metering pump adjusts the cross-sectional area of the closed space through the movement of the cylinder moving plate, and further realizes the adjustment of the liquid feeding amount. When the device is applied to mixing of various liquid materials, the actuating plates of the metering pumps can move synchronously. When the mixing device is used, the cross section of each metering pump is adjusted according to the liquid feeding amount of each liquid material, and the stability of the mixing proportion can be ensured.

Description

Metering pump for ensuring stable liquid-material mixing proportion

Technical Field

The invention relates to the technical field of liquid material output, in particular to a metering pump.

Background

In the existing PU (polyurethane) foaming part manufacturing equipment, a metering pump in an adopted system is a key part, and the mixing ratio of two materials is controlled by the metering pump of each system. The metering pumps of the prior art generally regulate the amount of liquid delivered by varying the stroke of the plug. Because the system pressure is unstable, and the control system of each of the two metering pumps ensures that the plug movement speeds of the two metering pumps are inconsistent, in the using process, the stroke of the plug can be influenced by the reaction of the outlet pressure and the return stroke difference of the mechanical mechanism to cause the plug to move and jump, namely, the time is fast and slow, so that the liquid output is unstable, the mixing proportion of the two materials is unstable, or the discharging is asynchronous to cause layering, and the produced foaming parts are unqualified.

Disclosure of Invention

The invention aims to provide a metering pump which can adjust liquid feeding amount and ensure stable mixing proportion of a plurality of liquid materials when the plurality of liquid materials are mixed.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a metering pump for ensuring the stable mixing proportion of liquid materials comprises a cylinder body and a piston assembly, wherein the cylinder body comprises a fixed cylinder and a cylinder body moving plate, a cylinder body opening is formed at one side of the fixed cylinder, and a liquid inlet and a liquid outlet are formed in the fixed cylinder at intervals; the cylinder body moving plate is arranged at the opening of the cylinder body in a sliding manner and forms a cylinder body space together with the fixed cylinder; the piston assembly comprises an actuating plate and a piston telescopic piece, the actuating plate is slidably arranged on the fixed cylinder, the piston telescopic piece is connected with the actuating plate and is in sliding contact with the inner wall of the fixed cylinder and the inner wall of the cylinder body moving plate so as to form a closed space for containing liquid materials in the cylinder body space, and the closed space is communicated with the liquid inlet and the liquid outlet; under the action of external force, the actuating plate can drive the piston expansion piece to reciprocate along a first direction, the cylinder moving plate can reciprocate along a second direction perpendicular to the first direction to adjust the cross-sectional area of the closed space, and the piston expansion piece can correspondingly expand and contract along the second direction under the force, so that the piston expansion piece can be kept in contact with the cylinder moving plate.

Furthermore, the piston telescopic part comprises a push plate, a telescopic plate and a push driving part, the push plate and the actuating plate are arranged oppositely, the push plate is in sliding contact with the inner side of the cylinder moving plate, the actuating plate and the fixed cylinder are in sliding contact with one side of the cylinder moving plate, the telescopic plate is positioned in the cylinder space, the opposite two sides of the telescopic plate are respectively connected with the actuating plate and the push plate, and the free side edge of the telescopic plate is in sliding contact with the inner wall of the fixed cylinder; the ejection driving part is located on one side, back to the closed space, of the telescopic plate and is connected with the ejector plate and the actuating plate so as to drive the ejector plate to move along the second direction and drive the telescopic plate to perform telescopic movement along the second direction.

Furthermore, the ejection driving part comprises a scissor mechanism and a driver, two opposite ends of the scissor mechanism are respectively connected with the actuating plate and the ejection plate, and the driver is arranged on the actuating plate and connected with the scissor mechanism to drive the expansion plate and the ejection plate to move.

Furthermore, the scissor mechanism comprises two scissor telescopic pieces and a connecting shaft, the two scissor telescopic pieces are arranged in parallel and oppositely, each scissor telescopic piece comprises two mounting plates and a scissor rack, the two mounting plates are respectively fixedly connected with the actuating plate and the ejector plate, and each mounting plate is provided with a dovetail groove extending along the first direction; the two opposite ends of the fork shearing frame are respectively provided with a fixed rod end and a movable rod end, the two fixed rod ends are respectively connected with the two mounting plates in a rotating way, and the two movable rod ends are respectively connected with the dovetail grooves on the two mounting plates in a sliding way through a dovetail slide block; the hinge shaft pin of the fork shearing frame is also connected with the telescopic plate through a connecting rod; the connecting shaft is positioned at one end of the fork shearing frame and is connected with two movable rod ends positioned at the same end of the fork shearing frame; the driver is connected with the connecting shaft.

Further, the expansion plate comprises a plurality of piston plates which are sequentially hinged along the second direction, and the connecting rod is connected to the hinged position of two adjacent piston plates.

Furthermore, one end of the actuating plate penetrates through the fixed cylinder in a sliding mode and is located outside the cylinder space, and the ejector plate is located in the cylinder space.

Further, the cylinder space is cubic.

Furthermore, the number of the piston assemblies is two, the two piston assemblies are oppositely arranged along the first direction, the actuating plates of the two piston assemblies are connected together, and the piston telescopic pieces of the two piston assemblies divide the cylinder space into an installation space and two closed spaces positioned at the two opposite ends of the installation space; the liquid inlet reaches the quantity of liquid outlet is two, two inlets respectively with two airtight space intercommunication, two liquid outlets respectively with two airtight space intercommunication.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

1. the metering pump adjusts the cross sectional area of the closed space through the movement of the cylinder moving plate, and further realizes the adjustment of the liquid feeding amount. When the metering pump is applied to mixing of various liquid materials, the liquid feeding amount of the metering pump is adjusted through the movement of the cylinder moving plate, so that the actuating plates of the metering pumps are allowed to move synchronously, and the stable mixing proportion of the various liquid materials during mixing can be ensured as long as the cross sections of the metering pumps are adjusted according to the liquid feeding amount of each liquid material, the influence of unstable system pressure is avoided, and the product yield is improved. Because the action plate synchronous motion of a plurality of measuring pumps, consequently, can ensure the ejection of compact of multiple liquid material simultaneously, avoid the ejection of compact to lead to the emergence of layering phenomenon when compounding not synchronous.

2. In the metering pump, the telescopic plate of the metering pump is controlled to be telescopic through the shearing fork mechanism, so that the telescopic plate can move more stably; the shearing fork mechanism is controlled to move by the ejection driving piece, the ejection driving piece can give a thrust to the ejection plate and the actuating plate, so that the ejection plate is in close contact with the cylinder moving plate, the actuating plate is in close contact with the fixed cylinder, the piston assembly is guaranteed to have enough pressure to guarantee the sealing performance of a closed space, the liquid material is prevented from polluting the shearing fork mechanism, and the precision and the service life of the metering pump are further improved.

3. The metering pump is cubic, so that the output quantity of the liquid can be calculated conveniently.

Drawings

Fig. 1 is a perspective view of a metering pump in a first embodiment of the present invention.

Fig. 2 is a perspective view of the metering pump shown in fig. 1.

Fig. 3 is an exploded view of the metering pump of fig. 1.

Fig. 4 is a block diagram of the metering pump of fig. 3 from another perspective.

Fig. 5 is a perspective view of the ejector drive member of the metering pump of fig. 4.

Fig. 6 is a partially exploded view of the ejector actuator of fig. 5.

Fig. 7 is a perspective view of a metering pump telescopic plate in the first embodiment of the present invention.

Fig. 8 is a perspective view of the expansion plate shown in fig. 7 from another perspective.

Fig. 9 is an exploded view of the piston plate of the expansion plate of fig. 7.

Fig. 10 is a perspective schematic view of the metering pump of fig. 1 in a front view.

Fig. 11 is a perspective view of a metering pump in a second embodiment of the present invention.

Fig. 12 is a perspective view of the metering pump of fig. 11.

Fig. 13 is an exploded view of the metering pump of fig. 11.

Fig. 14 is a diagram illustrating a state of use of the metering pump shown in fig. 1.

Description of the main elements

100-metering pump, 2-cylinder body, 21-fixed cylinder, 211-liquid inlet, 212-liquid outlet, 213-end plate, 2131-sliding hole, 214-first side plate, 215-second side plate, 216-third side plate, 23-cylinder body moving plate, 25-cylinder body opening, 4-piston assembly, 41-actuating plate, 43-piston telescopic piece, 431-push plate, 433-telescopic plate, 4331-piston plate, 4332-connecting sleeve, 4334-bolt penetrating shaft, 435-push driving piece, 436-scissor mechanism, 4361-scissor telescopic piece, 4362-connecting shaft, 4363-mounting plate, 4364-scissor rack, 4365-dovetail groove, 4366-fixed rod end, 4367-moving rod end, 4368-hinged shaft pin, 4369-connecting rod, 4360 dovetail slide block, 437 driver, 5-closed space, and 6-installation space.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a metering pump 100 according to a first embodiment of the present invention includes a cylinder 2 and a piston assembly 4 mounted on the cylinder 2.

In the present embodiment, the cylinder 2 has a substantially cubic box shape and includes a fixed cylinder 21 and a cylinder moving plate 23. Referring to fig. 2 to 4, a cylinder opening 25 is formed at one side of the fixed cylinder 21, and a liquid inlet 211 and a liquid outlet 212 are further formed at intervals on the fixed cylinder 21; the cylinder moving plate 23 is slidably installed at the cylinder opening 25, and encloses a cylinder space with the fixed cylinder 21, and the cylinder space is cubic.

In the present embodiment, the fixed cylinder 21 includes two end plates 213, a first side plate 214, a second side plate 215, and a third side plate 216. The end plate 213 is substantially in the form of a cube plate, and the two end plates 213 are arranged in parallel and opposite to each other. One of the end plates 213 has a sliding hole 2131 formed therethrough, and the sliding hole 2131 is in spatial communication with the cylinder and is disposed away from the cylinder opening 25. The first side plate 214, the second side plate 215 and the third side plate 216 are all substantially in the shape of a cuboid plate, the first side plate 214, the second side plate 215 and the third side plate 216 are sequentially connected and arranged around the periphery of the end plate 213, and two opposite ends of the first side plate 214, two opposite ends of the second side plate 215 and two opposite ends of the third side plate 216 are respectively connected with the two end plates 213. The first side plate 214 and the third side plate 216 together enclose the cylinder opening 25, and the cylinder opening 25 is substantially rectangular. The liquid inlet 211 is disposed on the first side plate 214 and located at an end of the first side plate 214 away from the sliding hole 2131. The liquid outlets 212 are formed in the third side plate 216 and are located at one end of the third side plate 216 away from the sliding hole 2131.

The cylinder moving plate 23 has a substantially rectangular parallelepiped plate shape, and matches the shape of the cylinder opening 25. Two opposite side edges of the cylinder moving plate 23 are in sliding contact with the inner walls of the two end plates 213, respectively, and the other two opposite side edges of the cylinder moving plate 23 are in sliding contact with the inner walls of the first side plate 214 and the third side plate 216, respectively, to seal the cylinder opening 25 of the fixed cylinder 21, so that the cylinder moving plate 23 and the fixed cylinder 21 form the cylinder space, and the sealing performance of the cylinder space is improved. Preferably, a sealing ring (not shown) is provided on a peripheral wall of the cylinder moving plate 23 to further improve sealability. The arrangement of the sealing ring belongs to the prior art, and is not described herein for brevity.

The piston unit 4 includes an actuating plate 41 and a piston expansion member 43. The actuating plate 41 is slidably mounted on the fixed cylinder 21, the piston extension member 43 is connected to the actuating plate 41 and slidably contacts with the inner wall of the fixed cylinder 21 and the inner wall of the cylinder moving plate 23, so as to form a closed space 5 for containing liquid material in the cylinder space, and the closed space 5 is communicated with both the liquid inlet 211 and the liquid outlet 212. Under the action of external force, the actuating plate 41 can drive the piston extensible member 43 to reciprocate along a first direction, the cylinder moving plate 23 can reciprocate along a second direction perpendicular to the first direction to adjust the cross-sectional area of the enclosed space 5, and the piston extensible member 43 can be correspondingly extended and retracted along the second direction under the action of force, so that the piston extensible member 43 can be kept in contact with the cylinder moving plate 23.

In the present embodiment, the first direction is a height direction of the cylinder 2 in fig. 1, and the second direction is a longitudinal direction of the cylinder 2 in fig. 1. Referring to fig. 10, the operating plate 41 is substantially rectangular plate-shaped, one end of the operating plate 41 extends into the cylinder space through the sliding hole 2131, and the other end is located outside the cylinder space. One side of the actuating plate 41 is in sliding contact with the second side plate 215, and the width of the actuating plate 41 is the same as the width of the cylinder space, so that opposite sides of the actuating plate 41 can be in contact with the inner walls of the first side plate 214 and the third side plate 216, respectively. Preferably, mounting grooves (not shown) are recessed in the side of the operating plate 41 facing the second side plate 215, the side of the operating plate 41 facing the first side plate 214, and the side of the operating plate 41 facing the third side plate 216, and sealing strips (not shown) are installed in the mounting grooves, and the three sealing strips are in sliding contact with the first side plate 214, the second side plate 215, and the third side plate 216 respectively, so as to prevent the liquid material in the enclosed space 5 from leaking along the gap between the operating plate 41 and the fixed cylinder 21, thereby improving the sealing performance of the enclosed space 5. The installation of the sealing strip is prior art and will not be described herein for brevity.

In this embodiment, the piston jack 43 includes a push plate 431, a jack plate 433, and a push driving member 435. The top plate 431 is disposed opposite to the operation plate 41. In the present embodiment, the top plate 431 is housed in the cylinder space and is in sliding contact with the inside of the cylinder moving plate 23; opposite two sides of the telescopic plate 433 are respectively connected with the actuating plate 41 and the pushing plate 431, and the free side edge of the telescopic plate 433 is in sliding contact with the inner wall of the fixed cylinder 21, so that a closed space 5 is formed at one side of the telescopic plate 433 close to the liquid inlet 211 and the liquid outlet 212; the pushing driving piece 435 is accommodated in the cylinder space and is positioned on one side of the expansion plate 433, which is opposite to the closed space 5; the pushing driving member 435 connects the pushing plate 431 and the actuating plate 41 to drive the pushing plate 431 to move along the second direction and drive the telescopic plate 433 to telescope along the second direction.

In the present embodiment, the push plate 431 is parallel to the operation plate 41. The top plate 431 has a substantially square plate shape, and has a width equal to that of the cylinder space, so that opposite sides of the top plate 431 can be in sliding contact with the inner walls of the first side plate 214 and the third side plate 216, respectively. The expansion plate 433 is substantially square, two opposite sides thereof are respectively connected to an end of the actuation plate 41 away from the sliding hole 2131 and an end of the pushing plate 431 away from the sliding hole 2131, and a free side of the expansion plate 433 is respectively in sliding contact with an inner wall of the first side plate 214 and an inner wall of the third side plate 216. The closed space 5 is positioned on one side of the telescopic plate 433, which is opposite to the sliding hole 2131; the side of the expansion plate 433 facing away from the enclosed space 5 forms an installation space 6.

Preferably, fixing grooves (not shown) are respectively formed on one side of the pushing plate 431 facing the cylinder moving plate 23, one side of the pushing plate 431 facing the first side plate 214, and one side of the concave pushing plate 431 facing the third side plate 216, sealing strips (not shown) are installed in the fixing grooves, and the three sealing strips are respectively in sliding contact with the cylinder moving plate 23, the first side plate 214 and the third side plate 216 to prevent liquid in the sealed space 5 from leaking to the installation space 6 from a gap between the pushing plate 431 and the cylinder moving plate 23, so that the sealing performance of the sealed space 5 is improved. The free side of the expansion plate 433 is also provided with a sealing strip (not shown) to prevent the liquid material in the enclosed space 5 from leaking to the installation space 6 from the gap between the expansion plate 433 and the fixed cylinder 21, so as to improve the sealing performance of the enclosed space 5.

Referring to fig. 7 to 9, in the present embodiment, the telescopic plate 433 includes a plurality of piston plates 4331 hinged in sequence along the second direction, specifically: a connecting sleeve 4332 is connected to one side of each piston plate 4331 facing the adjacent piston plate 4331, and the connecting sleeves 4332 of the adjacent two piston plates 4331 are arranged in a third direction (the width direction of the cylinder body 2 in fig. 1) perpendicular to the first direction and the second direction, and are rotatably connected by a bolt shaft 4334, so that the adjacent two piston plates 4331 are hinged together.

Referring to fig. 4 to 6 and fig. 10, the pushing driving member 435 is located in the installation space 6, and includes a scissors mechanism 436 and a driver 437. The opposite ends of the scissors mechanism 436 are respectively connected with the actuating plate 41 and the pushing plate 431; the driver 437 is connected to the scissors mechanism 436 to drive the top pushing plate 431 to move, so that the top pushing plate 431 abuts against the inner side of the cylinder moving plate 23, and simultaneously drives the telescopic plate 433 to extend and retract along the second direction.

In this embodiment, the scissors mechanism 436 includes two scissors telescoping members 4361 and a connecting shaft 4362, and the two scissors telescoping members 4361 are disposed oppositely and in parallel along the third direction. Each scissor telescopic element 4361 comprises two mounting plates 4363 and a scissor bracket 4364, the two mounting plates 4363 are fixedly connected with the actuating plate 41 and the ejector plate 431 respectively, and each mounting plate 4363 is provided with a dovetail groove 4365 extending along a first direction; the fork-shearing frame 4364 belongs to the prior art, and has two opposite ends each having a fixed rod end 4366 and a movable rod end 4367, wherein the two fixed rod ends 4366 are respectively rotatably connected with two mounting plates 4363, and the two movable rod ends 4367 are respectively slidably connected with dovetail grooves 4365 on the two mounting plates 4363 through a dovetail slider 4360; the hinge pin 4368 of the fork arm 4364 is connected to the hinge joint of two adjacent piston plates 4331, i.e. the through pin shaft 4334, by a connecting rod 4369. The connecting shaft 4362 is located at an end of the fork arm 4364 near the movable plate 41, and is connected to two movable rod ends 4367 of the two fork arms 4364 near an end of the movable plate 41. The actuator 437 is mounted on the operating plate 41 and connected to the connecting shaft 4362. The actuator 437 is preferably a pneumatic or hydraulic cylinder. The connecting shaft 4362 can be pushed by the driver 437 to move along the dovetail groove 4365, so as to drive the two fork arms 4364 to extend and retract along the second direction, and further, the fork arms 4364 give a pushing force to the top pushing plate 431 and the actuating plate 41, so that the top pushing plate 431 and the cylinder moving plate 23 keep in contact, the actuating plate 41 and the second side plate 215 keep in contact, and meanwhile, the fork arms 4364 and the top pushing plate 431 can drive the telescopic plate 433 to perform corresponding extending and retracting movements.

It is understood that the liquid inlet 211 and the liquid outlet 212 may be provided with a one-way valve, the one-way valve at the liquid inlet 211 only allows the liquid material to enter the enclosed space 5 from the liquid inlet 211, and the one-way valve at the liquid outlet 212 only allows the liquid material to be discharged from the enclosed space 5 from the liquid outlet 212, which belongs to the prior art and will not be described herein for brevity.

Referring to fig. 14, in use, the cross-sectional area of the sealed space 5 is adjusted by moving the cylinder moving plate 23 and extending and contracting the piston extensible member 43 according to the required liquid feeding amount of the liquid material each time. The movement of the cylinder moving plate 23 can be driven by a driving device, and the driving device preferably adopts a worm gear driving device, so that the output force is large, the self-locking effect is good, and the positioning is accurate. The structure of the worm gear driving device belongs to the prior art, and is not described herein for brevity.

The extension and retraction of the telescopic plate 433 are driven by the pushing and ejecting driving piece 435, when the driver 437 drives the connecting shaft 4362 to move in a direction away from the sliding hole 2131, the fork frame 4364 is stretched, and the pushing and ejecting plate 431 is driven to move towards the cylinder moving plate 23 to be tightly attached to the cylinder moving plate 23; when the driver 437 drives the connecting shaft 4362 to move toward the slide hole 2131, the fork arm 4364 contracts, so that the telescopic plate 433 is compressed. This arrangement ensures that the top plate 431 is in close contact with the cylinder moving plate 23, thereby ensuring the sealing property of the sealed space 5.

According to the required liquid feeding amount of the liquid material each time, the driving action plate 41 drives the piston telescopic piece 43 to move along the first direction by a preset distance h: when the piston extension piece 43 moves towards the sliding hole 2131, the enclosed space 5 can be enlarged (the left drawing in fig. 14), at this time, the enclosed space 5 is under negative pressure, the liquid material enters the enclosed space 5 of the metering pump 100 through the liquid inlet 211, when the piston extension piece 43 moves away from the sliding hole 2131, the enclosed space 5 is reduced (the right drawing in fig. 14), and the liquid material is discharged out of the enclosed space 5 through the liquid outlet 212. The movement of the actuating plate 41 is preferably driven by a driving means, such as a hydraulic cylinder, etc., which is known in the art and will not be described herein for brevity. The liquid feeding amount of the liquid material at each time is the product of the cross-sectional area of the closed space 5 of the metering pump 100 and the moving distance h of the operating plate 41.

Referring to fig. 11 to 13 together, a metering pump (not shown) according to a second embodiment of the present invention has substantially the same structure as the metering pump 100 according to the first embodiment, and includes a cylinder 2 and a piston assembly 4 mounted on the cylinder 2, the cylinder 2 includes a fixed cylinder 21 and a cylinder moving plate 23, and the difference is that: in the present embodiment, the two end plates 213 are each provided with a slide hole 2131; the number of the piston assemblies 4 is two, the structure thereof is the same as that of the first embodiment, the two piston assemblies 4 are oppositely arranged along the first direction, one ends of the two actuating plates 41 respectively extend into the cylinder space from the two sliding holes 2131, and the ends of the two actuating plates 41 located in the cylinder space are connected together, in this embodiment, the actuating plates 41 of the two piston assemblies 4 are integrally formed into a whole. The piston telescopic pieces 43 of the two piston assemblies 4 divide the cylinder space into an installation space 6 and two closed spaces 5 positioned at two opposite ends of the installation space 6; the number of the liquid inlets 211 and the number of the liquid outlets 212 are two, the two liquid inlets 211 are respectively provided on the two end plates 213 and respectively communicated with the two enclosed spaces 5, and the two liquid outlets 212 are respectively provided on the two end plates 213 and respectively communicated with the two enclosed spaces 5.

Referring to fig. 12, when the movable plate 41 moves upward along the first direction, the upper enclosed space 5 becomes smaller, so that the liquid in the upper enclosed space 5 is discharged from the corresponding liquid outlet 212, and at the same time, the lower enclosed space 5 becomes larger, so that the liquid enters the lower enclosed space 5 from the lower liquid inlet 211. When the movable plate 41 moves downward in the first direction, the closed space 5 located above becomes large so that the liquid material enters from the liquid inlet 211 located above into the closed space 5 located above, and at the same time, the closed space 5 located below becomes small so that the liquid material located below in the closed space 5 is discharged from the corresponding liquid outlet 212. Through this kind of structure, can make liquid material discharge from two liquid outlets 212 in turn, improve the continuity of operation, and then be favorable to work efficiency's improvement.

The metering pump 100 adjusts the cross-sectional area of the sealed space 5 by moving the cylinder moving plate 23, thereby adjusting the amount of liquid fed. When the metering pump 100 is applied to mixing of multiple liquid materials, the liquid feeding amount of the metering pump 100 is adjusted through the movement of the cylinder moving plate 23, so that the actuating plates of the metering pumps 100 are allowed to move synchronously, and the stable mixing proportion of the multiple liquid materials during mixing can be ensured as long as the cross sections of the metering pumps 100 are adjusted according to the liquid feeding amount of each liquid material, the influence of unstable system pressure is avoided, and the product yield is improved. Because the action plates of the metering pumps 100 move synchronously, the simultaneous discharge of various liquid materials can be ensured, and the layering phenomenon caused by the asynchronous material mixing can be avoided.

In the metering pump 100, the extension plate 433 of the metering pump is controlled to extend and retract by the scissor mechanism 436, so that the movement of the extension plate 433 is more stable; the scissor mechanism 436 is controlled to move by the pushing driving member 435, and can provide a pushing force to the pushing plate 431 and the actuating plate 41, so that the pushing plate 431 is kept in close contact with the cylinder moving plate 23, and the actuating plate 41 is kept in close contact with the fixed cylinder 21, thereby ensuring that the piston assembly 4 has enough pressure to ensure the sealing performance of the closed space 5, preventing liquid materials from polluting the scissor mechanism 436, and further improving the precision and the service life of the metering pump 100.

The metering pump 100 is cubic, and facilitates calculation of the output of the liquid.

It is understood that in other embodiments, the pushing plate 431 and the pushing driving member 435 of the piston assembly 4 may be omitted, and in this case, one side of the telescopic plate 433 may be slidably connected to the cylinder moving plate 23, for example, a dovetail slider may be provided on one side of the telescopic plate 433 facing the cylinder moving plate 23, and a dovetail groove extending in the first direction may be provided on one side of the cylinder moving plate 23 facing the telescopic plate 433, and the dovetail slider may be slidably connected to the dovetail groove. At this time, the expansion plate 433 expands and contracts with the movement of the cylinder moving plate 23. However, this method deteriorates the sealing performance of the sealed space 5, and the accuracy and life of the metering pump 100 are reduced.

It is to be understood that the structure of the telescopic plate 433 is not limited to this embodiment, and other telescopic plate 433 structures in the prior art may be adopted.

It is understood that in other embodiments, the end of the top push plate 431 remote from the telescopic plate 433 may also be extended out of the cylinder space.

It is understood that the metering pump 100 is not limited to use in foaming machines, and may be used in other devices requiring liquid delivery.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a ensure stable measuring pump of liquid material mixture ratio which characterized in that: the cylinder body comprises a fixed cylinder and a cylinder body moving plate, wherein a cylinder body opening is formed on one side of the fixed cylinder, and a liquid inlet and a liquid outlet are formed in the fixed cylinder at intervals; the cylinder body moving plate is arranged at the opening of the cylinder body in a sliding manner and forms a cylinder body space together with the fixed cylinder; the piston assembly comprises an actuating plate and a piston telescopic piece, the actuating plate is slidably arranged on the fixed cylinder, the piston telescopic piece is connected with the actuating plate and is in sliding contact with the inner wall of the fixed cylinder and the inner wall of the cylinder body moving plate so as to form a closed space for containing liquid materials in the cylinder body space, and the closed space is communicated with the liquid inlet and the liquid outlet; under the action of external force, the actuating plate can drive the piston expansion piece to reciprocate along a first direction, the cylinder moving plate can reciprocate along a second direction perpendicular to the first direction to adjust the cross-sectional area of the closed space, and the piston expansion piece can correspondingly expand and contract along the second direction under the force, so that the piston expansion piece can be kept in contact with the cylinder moving plate.

2. The metering pump of claim 1, wherein: the piston telescopic piece comprises a push plate, a telescopic plate and a push driving piece, the push plate and the actuating plate are arranged oppositely, the push plate is in sliding contact with the inner side of the cylinder moving plate, the actuating plate is in sliding contact with one side of the fixed cylinder, which is opposite to the cylinder moving plate, the telescopic plate is positioned in the cylinder space, the opposite two sides of the telescopic plate are respectively connected with the actuating plate and the push plate, and the free side edge of the telescopic plate is in sliding contact with the inner wall of the fixed cylinder; the ejection driving part is located on one side, back to the closed space, of the telescopic plate and is connected with the ejector plate and the actuating plate so as to drive the ejector plate to move along the second direction and drive the telescopic plate to perform telescopic movement along the second direction.

3. The metering pump of claim 2, wherein: the ejection driving part comprises a scissor fork mechanism and a driver, the two opposite ends of the scissor fork mechanism are respectively connected with the actuating plate and the ejection plate, and the driver is arranged on the actuating plate and connected with the scissor fork mechanism so as to drive the scissor fork mechanism to drive the telescopic plate and the ejection plate to move.

4. The metering pump of claim 3, wherein: the scissor mechanism comprises two scissor telescopic pieces and a connecting shaft, the two scissor telescopic pieces are oppositely arranged in parallel, each scissor telescopic piece comprises two mounting plates and a scissor rack, the two mounting plates are fixedly connected with the actuating plate and the ejector plate respectively, and each mounting plate is provided with a dovetail groove extending along the first direction; the two opposite ends of the fork shearing frame are respectively provided with a fixed rod end and a movable rod end, the two fixed rod ends are respectively connected with the two mounting plates in a rotating way, and the two movable rod ends are respectively connected with the dovetail grooves on the two mounting plates in a sliding way through a dovetail slide block; the hinge shaft pin of the fork shearing frame is also connected with the telescopic plate through a connecting rod; the connecting shaft is positioned at one end of the fork shearing frame and is connected with two movable rod ends positioned at the same end of the fork shearing frame; the driver is connected with the connecting shaft.

5. The metering pump of claim 2, wherein: the expansion plate comprises a plurality of piston plates which are sequentially hinged along the second direction, and the connecting rod is connected to the hinged position of two adjacent piston plates.

6. The metering pump of claim 2, wherein: one end of the actuating plate penetrates through the fixed cylinder in a sliding mode and is located outside the cylinder space, and the ejector plate is located in the cylinder space.

7. The metering pump of claim 1, wherein: the space of the cylinder body is cubic.

8. The metering pump of claim 1, wherein: the number of the piston assemblies is two, the two piston assemblies are oppositely arranged along the first direction, the actuating plates of the two piston assemblies are connected together, and the piston telescopic pieces of the two piston assemblies divide the cylinder space into an installation space and two closed spaces positioned at the two opposite ends of the installation space; the liquid inlet reaches the quantity of liquid outlet is two, two inlets respectively with two airtight space intercommunication, two liquid outlets respectively with two airtight space intercommunication.

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