CN110360078A - A kind of metering pump ensuring that liquid material mixed proportion is stable - Google Patents

Abstract

The invention provides a metering pump that ensures a stable mixing ratio of liquid materials, including a cylinder body and a piston assembly. The cylinder body includes a fixed cylinder and a moving plate for the cylinder body. A cylinder body opening, a liquid inlet and a liquid outlet are formed on the fixed cylinder; The body moving plate is slidably installed at the opening of the cylinder body, and forms a cylinder body space together with the fixed cylinder; the piston assembly includes an actuating plate and a piston telescopic part, and the actuating plate is slidably installed on the fixed cylinder, and the piston is telescopic. The component is connected with the actuating plate and is in sliding contact with the fixed cylinder and the moving plate of the cylinder body to form a closed space for accommodating the liquid material in the space of the cylinder body. The metering pump adjusts the cross-sectional area of the enclosed space through the movement of the moving plate of the cylinder body, thereby realizing the adjustment of the liquid delivery volume. When it is applied to the mixing of various liquid materials, the actuating plates of multiple metering pumps can move synchronously. When in use, as long as the cross-section of each metering pump is adjusted according to the liquid delivery volume of each liquid material, the mixing ratio can be kept stable.

Description

A metering pump to ensure stable mixing ratio of liquid and material

technical field

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

Background technique

In the existing PU (polyurethane) foaming parts manufacturing equipment, the metering pump in the system used is the key component, and the mixing ratio of the two materials is controlled by the metering pumps of the respective systems. The metering pump in the prior art usually adjusts the delivery volume by changing the stroke of the plug. Due to the instability of the system pressure, and the respective control systems of the two metering pumps, the movement speed of the two metering pump plugs is inconsistent. During use, the stroke of the plug will be affected by the reaction of the outlet pressure and the return stroke difference of the mechanical mechanism, resulting in the movement of the plug. The jumping phenomenon is that it is fast and slow, which makes the liquid output unstable, resulting in an unstable mixing ratio of the two materials, or the asynchronous output of the materials leads to stratification, resulting in unqualified foamed parts.

Contents of the invention

The present invention aims to provide a metering pump capable of adjusting the liquid delivery volume and ensuring a stable mixing ratio of various liquid materials when the various liquid materials are mixed.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A metering pump that ensures a stable mixing ratio of liquid materials, including a cylinder and a piston assembly, the cylinder includes a fixed cylinder and a moving plate for the cylinder, one side of the fixed cylinder forms a cylinder opening, and the fixed cylinder also has a A liquid inlet and a liquid outlet are provided at intervals; the moving plate of the cylinder body is slidably installed at the opening of the cylinder body, and forms a cylinder body space together with the fixed cylinder; the piston assembly includes a A moving plate and a piston telescopic part, the actuating plate is slidably installed on the fixed cylinder, the piston telescopic part is connected with the actuating plate, and moves with the inner wall of the fixed cylinder and the cylinder body The inner wall of the plate is in sliding contact to form a closed space for containing the liquid material in the cylinder space, and the closed space is connected with the liquid inlet and the liquid outlet; under the action of external force, the The actuating plate can drive the piston telescopic member to reciprocate along a first direction, and the cylinder moving plate can reciprocate along a second direction perpendicular to the first direction to adjust the cross-sectional area of the enclosed space , the piston telescoping member can be forced to expand and contract correspondingly along the second direction, so that the piston telescoping member can keep in contact with the cylinder moving plate.

Further, the piston expansion member includes a pusher plate, a telescopic plate and a pusher drive member, the pusher plate is arranged opposite to the actuating plate, and the pusher plate is in sliding contact with the inner side of the moving plate of the cylinder body, so The actuating plate is in sliding contact with one side of the fixed cylinder relative to the moving plate of the cylinder body, the telescopic plate is located in the space of the cylinder body, and the opposite sides of the telescopic plate are respectively in contact with the actuating plate and the moving plate of the cylinder body. The ejector plate is connected, and the free side of the telescopic plate is in sliding contact with the inner wall of the fixed cylinder; the ejector driving member is located on the side of the telescopic plate facing away from the confined space, and connects the ejector plate and the inner wall of the fixed cylinder. The actuating plate is used to drive the ejector plate to move along the second direction, and drive the telescopic plate to perform telescopic movement along the second direction.

Further, the pushing driving part includes a scissors mechanism and a driver, the opposite ends of the scissors mechanism are respectively connected with the actuating plate and the pushing plate, and the driver is mounted on the actuating plate and connected with the scissor mechanism to drive the scissor mechanism to drive the telescopic plate and the ejector plate to move.

Further, the scissor mechanism includes two scissor telescopic parts and a connecting shaft, the two scissor telescopic parts are arranged in parallel and opposite each other, each scissor telescopic part includes two mounting plates and a scissor frame, and the two mounting plates The plates are respectively fixedly connected with the actuating plate and the ejecting plate, and each mounting plate is provided with a dovetail groove extending along the first direction; the opposite ends of the scissor frame have a fixed rod end and One moving rod end, two fixed rod ends are respectively rotatably connected with two mounting plates, and the two moving rod ends are slidingly connected with the dovetail grooves on the two mounting plates respectively through a dovetail slider; the hinge shaft of the scissor frame The pin is also connected with the telescopic plate through a connecting rod; the connecting shaft is located at one end of the scissor frame, and is connected with two moving rod ends at the same end of the scissor frame; the driver is connected with the connecting shaft connect.

Further, the expansion plate includes a plurality of piston plates hinged in sequence along the second direction, and the connecting rod is connected to the hinge of two adjacent piston plates.

Further, one end of the actuating plate slides through the fixed cylinder and is located outside the cylinder space, and the ejector plate is located in the cylinder space.

Further, the cylinder space is in the shape of a cube.

Further, the number of the piston assemblies is two, the two piston assemblies are arranged opposite to each other along the first direction, the actuating plates of the two piston assemblies are connected together, and the piston telescoping parts of the two piston assemblies connect the The space of the cylinder body is divided into an installation space and two enclosed spaces located at opposite ends of the installation space; the number of the liquid inlet and the liquid outlet is two, and the two liquid inlets are respectively connected to the two The two closed spaces communicate with each other, and the two liquid outlets communicate with the two closed spaces respectively.

Owing to adopting above-mentioned technical scheme, the present invention has following beneficial effect:

1. The above-mentioned metering pump adjusts the cross-sectional area of the enclosed space through the movement of the moving plate of the cylinder body, and then realizes the adjustment of the liquid delivery volume. When it is applied to the mixing of various liquid materials, since the metering pump adjusts the amount of liquid delivered through the movement of the moving plate of the cylinder body, it allows the actuating plates of multiple metering pumps to move synchronously, so as long as it is based on each liquid The liquid delivery volume of the material is adjusted to the cross section of each metering pump, which can ensure the stability of the mixing ratio of various liquid materials during mixing, and is not affected by the instability of the system pressure, which improves the qualified rate of the product. Since the actuating plates of multiple metering pumps move synchronously, it can ensure that various liquid materials are discharged at the same time, avoiding the occurrence of stratification during mixing due to asynchronous discharge.

2. For the above-mentioned metering pump, the expansion and contraction of the telescopic plate is controlled by the scissors mechanism, which can make the movement of the telescopic plate more stable; the scissors mechanism controls the movement through the ejector driving part, which can give a thrust to the ejector plate and the actuating plate, so that The ejector plate is kept in close contact with the moving plate of the cylinder body, and the actuating plate is kept in close contact with the fixed cylinder, so as to ensure that the piston assembly has sufficient pressure to ensure the sealing of the enclosed space, avoiding the liquid material from contaminating the scissor mechanism, and further improving the efficiency of the metering pump. accuracy and service life.

3. The above-mentioned metering pump is in the shape of a cube, which is convenient for calculating the output volume of the liquid.

Description of 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 shown in Fig. 1 .

Fig. 4 is a structural diagram of the metering pump shown in Fig. 3 from another perspective.

Fig. 5 is a perspective view of the ejector driving part in the metering pump shown in Fig. 4 .

FIG. 6 is a partial exploded view of the ejection drive shown in FIG. 5 .

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

Fig. 8 is a perspective view of the telescopic plate shown in Fig. 7 at another viewing angle.

Fig. 9 is an exploded view of the piston plate in the telescopic plate shown in Fig. 7 .

Fig. 10 is a schematic perspective view of the metering pump shown in 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 shown in FIG. 11. FIG.

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

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

Explanation of main component symbols

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-action plate, 43-piston expansion part, 431-ejector plate, 433-expansion plate, 4331- Piston plate, 4332-connecting sleeve, 4334-intersecting pin shaft, 435-ejecting driving part, 436-scissor mechanism, 4361-scissor expansion part, 4362-connecting shaft, 4363-installation plate, 4364-scissor frame, 4365-Dovetail groove, 4366-Fixed rod end, 4367-Movement rod end, 4368-Hinged shaft pin, 4369-Connecting rod, 4360-Dovetail slider, 437-Driver, 5-Confined space, 6-Installation space.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or there can also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 , the first embodiment of the present invention provides a metering pump 100 to ensure a stable mixing ratio of liquid and material, including a cylinder 2 and a piston assembly 4 installed on the cylinder 2 .

In this embodiment, the cylinder body 2 is roughly in the shape of a cubic box, and includes a fixed cylinder 21 and a cylinder moving plate 23 . Please refer to Fig. 2 to Fig. 4 together, one side of the fixed cylinder 21 forms the cylinder opening 25, and the fixed cylinder 21 is also provided with a liquid inlet 211 and a liquid outlet 212 at intervals; the cylinder moving plate 23 is slidably installed on Cylinder body opening 25 places, and jointly encloses a cylinder body space with fixed cylinder 21, and cylinder body space is cube shape.

In this 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 plates 213 are roughly in the shape of a cubic plate, and two end plates 213 are arranged parallel to each other. A sliding hole 2131 is opened through one of the end plates 213 , and the sliding hole 2131 communicates with the cylinder body space and is disposed away from the cylinder body opening 25 . The first side plate 214, the second side plate 215 and the third side plate 216 are generally in the shape of a cube, and the first side plate 214, the second side plate 215 and the third side plate 216 are sequentially connected and surround the periphery of the end plate 213 It is provided that opposite ends of the first side plate 214 , opposite ends of the second side plate 215 and opposite ends of the third side plate 216 are respectively connected to the two end plates 213 . The first side plate 214 and the third side plate 216 jointly enclose the cylinder opening 25 , and the cylinder opening 25 is roughly in the shape of a rectangular opening. The liquid inlet 211 is defined 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 defined on the third side plate 216 and are located at an end of the third side plate 216 away from the sliding hole 2131 .

The cylinder moving plate 23 is roughly in the shape of a cuboid, which matches the shape of the cylinder opening 25 . Wherein two opposite sides of the cylinder moving plate 23 are in sliding contact with the inner walls of the two end plates 213 respectively, and the remaining two opposite sides of the cylinder moving plate 23 are respectively in contact with the inner walls of the first side plate 214 and the third side plate 216. The inner wall is in sliding contact 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 improve the sealing performance of the cylinder space. Preferably, sealing rings (not shown) are provided on the surrounding walls of the cylinder moving plate 23 to further improve the sealing performance. The setting of the sealing ring belongs to the prior art, and will not be repeated here for the sake of omitting space.

The piston assembly 4 includes an actuating plate 41 and a piston telescoping member 43 . The actuating plate 41 is slidably installed on the fixed cylinder 21, and the piston telescoping member 43 is connected with the actuating plate 41, and is in sliding contact with the inner wall of the fixed cylinder 21 and the inner wall of the cylinder moving plate 23, so as to move in the cylinder space. An airtight space 5 for accommodating the liquid material is formed inside, and the airtight space 5 communicates 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 telescopic element 43 to reciprocate along a first direction, and the cylinder moving plate 23 can reciprocate along a second direction perpendicular to the first direction to adjust the cross section of the enclosed space 5. area, the piston telescoping member 43 can expand and contract correspondingly in the second direction under force, so that the piston telescoping member 43 can keep in contact with the cylinder moving plate 23 .

In this embodiment, the first direction is the height direction of the cylinder body 2 in FIG. 1 , and the second direction is the length direction of the cylinder body 2 in FIG. 1 . Please also refer to FIG. 10 , the actuating plate 41 is roughly in the shape of a cuboid plate, one end of the actuating 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 operating plate 41 is in sliding contact with the second side plate 215, and the width of the operating plate 41 is the same as the width of the cylinder body space, so that the opposite sides of the operating plate 41 can respectively contact the inner wall of the first side plate 214. and the inner wall of the third side plate 216 are in contact. Preferably, the side of the actuating plate 41 facing the second side plate 215, the side of the actuating plate 41 facing the first side plate 214, and the side of the actuating plate 41 facing the third side plate 216 are all concavely provided with mounting grooves. (not shown in the figure), a sealing strip (not shown in the figure) is installed in the installation groove, and the three sealing strips are respectively in sliding contact with the first side plate 214, the second side plate 215 and the third side plate 216 to prevent the airtight space 5 The liquid material inside leaks along the gap between the operating plate 41 and the fixed cylinder 21, thereby improving the sealing performance of the closed space 5. The installation of the sealing strip belongs to the prior art, and will not be repeated here for the sake of omitting space.

In this embodiment, the piston telescoping member 43 includes an ejector plate 431 , an extensible plate 433 and an ejector driving member 435 . The ejector plate 431 is opposite to the action plate 41 . In this embodiment, the ejector plate 431 is accommodated in the cylinder body space, and is in sliding contact with the inner side of the cylinder body moving plate 23; The free side of the free side is in sliding contact with the inner wall of the fixed cylinder 21, thereby forming a closed space 5 on the side of the telescopic plate 433 close to the liquid inlet 211 and the liquid outlet 212; The telescopic plate 433 faces away from the side of the confined space 5; the ejector driving member 435 connects the ejector plate 431 and the actuating plate 41 to drive the ejector plate 431 to move along the second direction, and drives the telescopic plate 433 to expand and contract along the second direction.

In this embodiment, the pushing plate 431 is parallel to the actuating plate 41 . The ejector plate 431 is roughly square plate-shaped with the same width as the cylinder space, so that the opposite sides of the ejector plate 431 can slide in contact with the inner wall of the first side plate 214 and the inner wall of the third side plate 216 respectively. The telescopic plate 433 is roughly square, and its opposite sides are respectively connected with the end of the actuating plate 41 far away from the sliding hole 2131 and the end of the pushing plate 431 away from the sliding hole 2131. The inner wall is in sliding contact with the inner wall of the third side plate 216 . The enclosed space 5 is located on the side of the telescopic plate 433 facing away from the sliding hole 2131 ; the side of the telescopic plate 433 facing away from the enclosed space 5 forms an installation space 6 .

Preferably, the side of the ejector plate 431 facing the cylinder moving plate 23, the side of the ejector plate 431 facing the first side plate 214, and the side of the concave ejector plate 431 facing the third side plate 216 are all provided with fixing grooves (not shown in the figure). shown), a sealing strip (not shown) is installed in the fixed groove, and the three sealing strips are respectively in sliding contact with the moving plate 23 of the cylinder body, the first side plate 214 and the third side plate 216, so as to prevent the liquid in the closed space 5 from The material leaks from the gap between the ejector plate 431 and the cylinder moving plate 23 to the installation space 6, thereby improving the sealing performance of the closed space 5. A sealing strip (not shown) is also installed on the free side of the expansion plate 433 to prevent the liquid material in the closed space 5 from leaking from the gap between the expansion plate 433 and the fixed cylinder 21 body 2 to the installation space 6, and then The sealing performance of the closed space 5 can be improved.

Please refer to FIG. 7 to FIG. 9 together. In this embodiment, the telescopic plate 433 includes a plurality of piston plates 4331 hinged in sequence along the second direction, specifically: each piston plate 4331 faces the side of the adjacent piston plate 4331 Connecting sleeves 4332 are connected, and the connecting sleeves 4332 of two adjacent piston plates 4331 are arranged along the third direction (the width direction of the cylinder body 2 in Fig. 1 ) perpendicular to the first direction and the second direction, and are inserted through the pin 4334 realizes rotational connection, thereby hinges two adjacent piston plates 4331 together.

Please refer to FIG. 4 to FIG. 6 and FIG. 10 at the same time, the ejection driving member 435 is located in the installation space 6 and includes a scissor mechanism 436 and a driver 437 . The opposite ends of the scissor mechanism 436 are respectively connected with the actuating plate 41 and the ejector plate 431; the driver 437 is connected with the scissor mechanism 436 to drive the scissor mechanism 436 to drive the ejector plate 431 to move, so that the ejector plate 431 and the cylinder body move The inner sides of the boards 23 are opposed to each other, and at the same time, the telescopic board 433 is driven to expand and contract along the second direction.

In this embodiment, the scissors mechanism 436 includes two scissors telescopic parts 4361 and a connecting shaft 4362, and the two scissors telescopic parts 4361 are arranged parallel to each other along the third direction. Each scissor telescopic member 4361 includes two mounting plates 4363 and a scissor frame 4364, and the two mounting plates 4363 are fixedly connected with the actuating plate 41 and the pushing plate 431 respectively, and each mounting plate 4363 is provided with a The extended dovetail groove 4365; the structure of the scissor frame 4364 belongs to the prior art, and its opposite ends all have a fixed rod end 4366 and a moving rod end 4367, and the two fixed rod ends 4366 are respectively connected with two mounting plates 4363 in rotation , the two moving rod ends 4367 are slidingly connected to the dovetail grooves 4365 on the two mounting plates 4363 through a dovetail slider 4360 respectively; The hinge, that is, through the pin shaft 4334. The connecting shaft 4362 is located at one end of the scissor frame 4364 near the actuating plate 41, and is connected with two moving rod ends 4367 of the two scissor frames 4364 near the end of the actuating plate 41. The driver 437 is installed on the action plate 41 and connected with the connecting shaft 4362 . The actuator 437 is preferably a pneumatic or hydraulic cylinder. The driver 437 can push the connecting shaft 4362 to move along the dovetail groove 4365, so as to drive the two scissor frames 4364 to expand and contract in the second direction, and then give the push plate 431 and the actuating plate 41 a thrust through the scissor frame 4364, so that the push plate 431 keeps in contact with the cylinder moving plate 23 and makes the actuating plate 41 keep in contact with the second side plate 215, while the movement of the scissor frame 4364 and the pushing plate 431 can drive the telescopic plate 433 to carry out the corresponding telescopic movement.

It can be understood that a one-way valve can be provided at the liquid inlet 211 and the liquid outlet 212, and the one-way valve at the liquid inlet 211 only allows the liquid material to enter the closed space 5 from the liquid inlet 211, and the liquid outlet 212 The one-way valve only allows the liquid material to be discharged from the closed space 5 through the liquid outlet 212, which belongs to the prior art, and will not be repeated here for the sake of omitting space.

Please refer to FIG. 14 . During use, the cross-sectional area of the closed space 5 can be adjusted by moving the cylinder moving plate 23 and the expansion and contraction of the piston telescopic part 43 according to the required liquid delivery amount of the liquid material each time. Wherein, the movement of the cylinder moving plate 23 can be driven by a driving device. The driving device preferably adopts a worm gear driving device, which has a large output force, good self-locking effect, and accurate positioning. The structure of the worm gear driving device belongs to the prior art, and will not be repeated here for the sake of omitting space.

The expansion and contraction of the telescopic plate 433 is driven by the push-off driver 435. When the driver 437 drives the connecting shaft 4362 to move away from the sliding hole 2131, the scissor frame 4364 is stretched, driving the push-off plate 431 to move toward the cylinder moving plate 23 to It is in close contact with the moving plate 23 of the cylinder body; when the driver 437 drives the connecting shaft 4362 to move toward the sliding hole 2131, the scissor frame 4364 shrinks, so that the telescopic plate 433 is compressed. This arrangement can ensure that the ejector plate 431 is in close contact with the cylinder moving plate 23 , thereby ensuring the sealing of the closed space 5 .

According to the amount of liquid required for the liquid material each time, the actuating plate 41 is driven to drive the piston telescopic member 43 to move a preset distance h along the first direction: when the piston telescopic member 43 moves toward the sliding hole 2131, the enclosed space 5 can be enlarged (the accompanying drawing on the left side of Figure 14), at this time, the closed space 5 is under negative pressure, and the liquid material enters the closed space 5 of the metering pump 100 through the liquid inlet 211. When the piston telescopic member 43 moves away from the sliding hole 2131 The enclosed space 5 becomes smaller (the accompanying drawing on the right of 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 device, such as a hydraulic cylinder, which belongs to the prior art, and will not be repeated here for omitting space. The amount of liquid material delivered 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 actuating plate 41 .

Please refer to Fig. 11 to Fig. 13 together, the second embodiment of the present invention provides a kind of metering pump (not labeled), and its structure is roughly the same as the metering pump 100 in the first embodiment, both include a cylinder body 2 and a The piston assembly 4 on the cylinder body 2, the cylinder body 2 includes a fixed cylinder 21 and a cylinder body moving plate 23, the difference is that in this embodiment, sliding holes 2131 are provided on the two end plates 213; the piston assembly 4 The quantity is two, and its structure is the same as that of the first embodiment. The two piston assemblies 4 are arranged opposite to each other along the first direction. One ends of the two actuating plates 41 extend into the cylinder space from the two sliding holes 2131 respectively. 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 as a whole. The piston expansion parts 43 of the two piston assemblies 4 divide the cylinder space into an installation space 6 and two closed spaces 5 located at opposite ends of the installation space 6; Two liquid inlets 211 are respectively opened on the two end plates 213 and communicate with the two enclosed spaces 5 respectively, and two liquid outlets 212 are respectively opened on the two end plates 213 and communicate with the two enclosed spaces 5 respectively.

Please refer to Fig. 12, when the moving plate 41 moves upward along the first direction, the closed space 5 located above becomes smaller, so that the liquid material located in the closed space 5 above is discharged from the corresponding liquid outlet 212, and at the same time, the liquid material located in the closed space 5 located below The enclosed space 5 becomes larger, so that the liquid material enters the enclosed space 5 located below from the liquid inlet 211 below. When the action plate 41 moves downward along the first direction, the upper enclosed space 5 becomes larger, so that the liquid material enters the upper enclosed space 5 from the upper liquid inlet 211, and at the same time, the lower enclosed space 5 become smaller, so that the liquid material located in the closed space 5 below is discharged from the corresponding liquid outlet 212 . Through this structure, the liquid material can be alternately discharged from the two liquid outlets 212 , which improves the continuity of the operation and is beneficial to the improvement of the working efficiency.

The above-mentioned metering pump 100 adjusts the cross-sectional area of the enclosed space 5 through the movement of the moving plate 23 of the cylinder body, thereby realizing the adjustment of the liquid delivery volume. When it is applied to the mixing of multiple liquid materials, since the metering pump 100 adjusts the liquid delivery volume through the movement of the cylinder moving plate 23, the actuating plates of multiple metering pumps 100 are allowed to move synchronously. Adjusting the liquid delivery volume of each liquid material to the cross section of each metering pump 100 can ensure that the mixing ratio of various liquid materials is stable during mixing, and is not affected by unstable system pressure, thereby improving the qualified rate of the product. Since the actuating plates of the multiple metering pumps 100 move synchronously, it is possible to ensure that various liquid materials are discharged at the same time, avoiding the occurrence of stratification when the materials are mixed due to asynchronous discharge.

The above-mentioned metering pump 100, its expansion plate 433 is controlled by the scissor mechanism 436 to expand and contract, which can make the movement of the expansion plate 433 more stable; 41 a thrust, so that the ejector plate 431 keeps in close contact with the cylinder moving plate 23, and the actuating plate 41 keeps in close contact with the fixed cylinder 21, thereby ensuring that the piston assembly 4 has sufficient pressure to ensure the sealing of the closed space 5, and avoid liquid The material pollutes the scissor mechanism 436, which further improves the accuracy and service life of the metering pump 100.

The above-mentioned metering pump 100 is in the shape of a cube, which is convenient for calculating the output volume of the liquid.

It can be understood that in other embodiments, the ejector plate 431 and the ejector drive member 435 of the piston assembly 4 can be omitted. At this time, one side of the telescopic plate 433 can be slidably connected with the cylinder moving plate 23, for example, A dovetail slider is provided on the side of the telescopic plate 433 facing the cylinder body moving plate 23, and a dovetail groove extending along the first direction is provided on the side of the cylinder body moving plate 23 facing the telescopic plate 433, and the dovetail slider and the dovetail groove Swipe to connect. At this time, the telescopic plate 433 expands and contracts with the movement of the cylinder moving plate 23 . However, this method will deteriorate the sealing performance of the closed space 5 and reduce the accuracy and life of the metering pump 100 .

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

It can be understood that, in other embodiments, the end of the ejector plate 431 away from the telescopic plate 433 can also be extended out of the space of the cylinder body.

It can be understood that the metering pump 100 is not limited to be used in a foaming machine, and can also be applied to other equipment that needs to output liquid materials.

The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not used to limit the scope of the patent application of the present invention. All equivalent changes or modifications completed under the technical spirit suggested by the present invention shall belong to The scope of patents covered by the present invention.

Claims (8)

1. a kind of metering pump for ensuring that liquid material mixed proportion is stable, it is characterised in that: including cylinder body and piston component, the cylinder body Including stationary cylinder and cylinder body movable plate, the side of the stationary cylinder forms cylinder body opening, and also compartment of terrain opens up on the stationary cylinder There are inlet and liquid outlet；The cylinder body movable plate is slidably installed in the cylinder body opening, and common with the stationary cylinder Surround a cylinder space；The piston component includes making movable plate and piston extensible member, it is described make movable plate be slidably installed in it is described On stationary cylinder, the piston extensible member and it is described make movable plate connection, and with the inner wall of the stationary cylinder and the cylinder body movable plate Inner wall sliding contact, to form the confined space for accommodating liquid material, the confined space and institute in the cylinder space It states inlet and the liquid outlet is connected to；Under the effect of external force, described to be able to drive piston extensible member edge as movable plate One first direction move back and forth, the cylinder body movable plate can along the second direction vertical with the first direction move back and forth with Adjust the cross-sectional area of the confined space, the piston extensible member can stress accordingly stretch along the second direction so that Obtaining the piston extensible member can be kept in contact with the cylinder body movable plate.

2. metering pump as described in claim 1, it is characterised in that: the piston extensible member includes ejector plate, expansion plate and pushes away Actuator is pushed up, the ejector plate is oppositely arranged with described as movable plate, the interior Slideslip of the ejector plate and the cylinder body movable plate Contact, the side sliding contact for making the movable plate cylinder body movable plate opposite with the stationary cylinder, the expansion plate are located at institute State in cylinder space, the opposite sides of the expansion plate makees movable plate and ejector plate is connect with described respectively, the expansion plate from By the inner wall sliding contact of side and the stationary cylinder；The ejection actuator is located at the expansion plate backwards to the confined space Side, and connect the ejector plate and it is described make movable plate, to drive the ejector plate to move along the second direction, and drive The expansion plate carries out stretching motion along the second direction.

3. metering pump as claimed in claim 2, it is characterised in that: the ejection actuator includes scissors mechanism and driver, The opposite end of the scissors mechanism makees movable plate and the ejector plate is connect with described respectively, and the driver is installed in the work It is connect on movable plate and with the scissors mechanism, to drive the scissors mechanism to drive the expansion plate and ejector plate movement.

4. metering pump as claimed in claim 3, it is characterised in that: the scissors mechanism includes that two shearing fork telescopic parts and one connect Spindle, two shearing fork telescopic parts are oppositely arranged in parallel, and each shearing fork telescopic part includes two mounting plates and a fork-shearing frame, two peaces Loading board makees movable plate and the ejector plate is fixedly connected with described respectively, and each mounting plate is equipped with to be extended along the first direction Dovetail groove；The opposite end of the fork-shearing frame all has a fixed rod end and a mobile rod end, and two fixed rod ends are respectively with two A mounting plate rotation connection, two mobile rod ends pass through a dovetail slide block respectively and connect with the dovetail groove sliding on two mounting plates It connects；The hinged pivot pin of the fork-shearing frame also passes through connecting rod and connect with the expansion plate；The connecting shaft is located at the fork-shearing frame One end, and be located at described fork-shearing frame the same end two mobile rod ends connect；The driver and the connection axis connection.

5. metering pump as claimed in claim 2, it is characterised in that: the expansion plate includes successively hinged along the second direction Muti-piece piston plate, the connecting rod is connected to the hinged place of adjacent two pieces of piston plates.

6. metering pump as described in claim 1, it is characterised in that: one end sliding for making movable plate is pierced by the stationary cylinder simultaneously Outside the cylinder space, the ejector plate is located in the cylinder space.

7. metering pump as described in claim 1, it is characterised in that: the cylinder space is in cubic.

8. metering pump as described in claim 1, it is characterised in that: the quantity of the piston component is two, two work Plug assembly is oppositely arranged along the first direction, and two piston components link together as movable plate, the work of two piston components Plug extensible member by the cylinder space be divided into installation space and positioned at two of the installation space opposite end it is described closed Space；The quantity of the inlet and the liquid outlet is two, and two inlets connect with two confined spaces respectively Logical, two liquid outlets are connected to two confined spaces respectively.