Pneumatic metering pump

Abstract

The utility model relates to the technical field of metering pumps, and provides a pneumatic metering pump which comprises a one-way valve, a metering mechanism, a driving mechanism and a control mechanism. Wherein the one-way valve is provided with a material storage cavity; a metering cylinder body of the metering mechanism is communicated with the material storage cavity, and a metering piston is slidably connected into the metering cylinder body so as to change the size of the material storage cavity; a driving part of the driving mechanism is connected with the metering piston; a driving cylinder body is internally divided into a first driving cavity and a second driving cavity; the control mechanism comprises an electromagnetic valve and an adjusting screw, the electromagnetic valve controls the driving piston to slide back and forth, and the adjusting screw adjusts the stroke of the driving piston. According to the pneumatic metering pump provided by the utility model, the motion control of the metering piston is easier through the electromagnetic valve, the motion of the metering piston can be controlled without more control components, the structure of the metering pump can be simplified, the cost is reduced, and the control precision is high, so that the motion of the metering piston is more accurate, and the precision of the pneumatic metering pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pumps, in particular to a pneumatic metering pump. Background Art

[0002] Metering pump is a kind of fluid conveying machinery, and its outstanding feature is that it can maintain a constant flow rate regardless of the discharge pressure. Metering pumps can simultaneously complete the functions of conveying, metering and regulating, thereby simplifying the production process. Using multiple metering pumps, several media can be input into the process flow in accurate proportions for mixing. Due to its own outstanding features, metering pumps have now been widely used in various industrial fields such as petrochemicals, pharmaceuticals, and food.

[0003] The metering pump in the prior art controls the movement stroke of the driving member in the driving mechanism to make the metering piston of the metering mechanism perform reciprocating sliding motion of the corresponding stroke, thereby alternately changing the volume of the one-way valve storage chamber to inhale or pump out the material and achieve the purpose of quantitatively conveying the material.

[0004] However, in the related metering pump technology, the motion control of the metering piston is difficult and requires more control components, which makes the structure of the metering pump complicated, the manufacturing cost is high, and the accuracy is poor. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a pneumatic metering pump to solve at least one of the above-mentioned technical defects in the prior art, making the motion control of the metering piston of the pneumatic metering pump easier, without requiring more control components, thereby simplifying the structure of the metering pump, reducing manufacturing costs and improving accuracy.

[0006] In order to achieve the purpose of the utility model, the utility model provides a pneumatic metering pump, which includes:

[0007] A one-way valve having an inlet, an outlet and a storage cavity that are interconnected;

[0008] The metering mechanism comprises a metering cylinder and a metering piston, wherein the metering cylinder is connected to the material storage cavity, and the metering piston is slidably connected to the metering cylinder and is suitable for changing the volume of the material storage cavity;

[0009] The driving mechanism comprises a driving member, a driving piston and a driving cylinder, wherein the first end of the driving member is connected to the metering piston, the second end of the driving member is connected to the driving piston, and the driving piston is slidably connected to the driving cylinder.

[0010] The driving piston divides the driving cylinder into a first driving chamber and a second driving chamber;

[0011] Control mechanism, including solenoid valve and adjusting screw,

[0012] The solenoid valve has a first gas delivery port and a second gas delivery port, wherein the first gas delivery port is communicated with the first drive chamber, and the second gas delivery port is communicated with the second drive chamber.

[0013] The solenoid valve controls the first gas delivery port and the second gas delivery port to alternately ventilate, so as to control the driving piston to slide back and forth along the axial direction of the driving cylinder body.

[0014] The adjusting screw extends into the second driving cavity through a spiral connection, and is suitable for adjusting the sliding stroke of the driving piston in the driving cylinder.

[0015] Preferably, the control mechanism further includes a ventilation valve,

[0016] The air exchange valve is arranged on the driving cylinder body and extends into the first driving chamber, and the air exchange valve is communicated with the solenoid valve.

[0017] When the driving piston contacts the air exchange valve, the first air delivery port of the solenoid valve outputs gas, and the gas flows into the first driving chamber to drive the driving piston to slide toward the second driving chamber.

[0018] When the driving piston is separated from the air exchange valve, the second gas delivery port of the solenoid valve outputs gas, and the gas flows into the second driving chamber to drive the driving piston to slide toward the first driving chamber.

[0019] Preferably, the ventilation valve comprises an elastic member, a ventilation valve core and a ventilation valve core seat;

[0020] The elastic member is arranged in the ventilation valve core seat, and the elastic member abuts against the ventilation valve core seat and the ventilation valve core respectively, so that the ventilation valve core and the ventilation valve core seat are telescopically connected;

[0021] The air exchange valve core seat is arranged on the driving cylinder body, and the air exchange valve core extends into the first driving chamber;

[0022] When the driving piston contacts the gas exchange valve core, the gas in the first driving chamber flows to the solenoid valve through the gas exchange valve core, so that the first gas delivery port of the solenoid valve is opened.

[0023] When the driving piston is separated from the gas exchange valve core, the gas in the first driving chamber is disconnected from the solenoid valve, so that the second gas delivery port of the solenoid valve is opened.

[0024] Preferably, the control mechanism further includes a first throttle valve and a second throttle valve.

[0025] The first throttle valve is arranged between the first gas delivery port and the first driving chamber, and the second throttle valve is arranged between the second gas delivery port and the second driving chamber.

[0026] Preferably, the portion of the adjusting screw extending outward is provided with a scale.

[0027] Preferably, the metering mechanism further comprises a metering inner cylinder, the metering inner cylinder is arranged in the metering cylinder body, and the metering piston is slidably connected to the metering inner cylinder;

[0028] The driving mechanism further comprises a driving inner cylinder, wherein the driving inner cylinder is arranged in the driving cylinder body, and the driving piston is slidably connected to the driving inner cylinder.

[0029] Preferably, it also includes a first sealing ring and a second sealing ring,

[0030] The first sealing ring is arranged between the metering piston and the metering inner cylinder, and the second sealing ring is arranged between the driving piston and the driving inner cylinder.

[0031] Preferably, it further comprises a first muffler, a second muffler and a third muffler,

[0032] The first muffler is communicated with the first gas delivery port, the second muffler is communicated with the second gas delivery port, and the third muffler is communicated with the ventilation valve.

[0033] Preferably, the metering cylinder is provided with an observation window, and the observation window is located between the metering piston and the driving member.

[0034] Preferably, the control mechanism further comprises a first locking column, and the first locking column passes through the driving cylinder body through a spiral connection and abuts against the adjusting screw.

[0035] The beneficial effects of the utility model are as follows: the utility model provides a pneumatic metering pump, which controls the reciprocating sliding motion of a driving piston in a driving cylinder body by arranging an electromagnetic valve with a first air delivery port and a second air delivery port, and uses a driving member to respectively connect the driving piston and the metering piston to control the reciprocating sliding motion of the metering piston in the metering cylinder body; at the same time, an adjusting screw is used to extend into the second driving chamber in a spiral connection manner to adjust the sliding stroke of the driving piston in the driving cylinder body, and under the connecting action of the driving member, the sliding stroke of the metering piston in the metering cylinder body can also be adjusted by the adjusting screw; the alternating ventilation of the first air delivery port and the second air delivery port by the electromagnetic valve, and the spiral adjustment of the adjusting screw, can make the movement control of the metering piston easier, and the movement of the metering piston can be controlled without more control components to achieve the adjustment of the rated metering value, which can simplify the structure of the metering pump and reduce the manufacturing cost, and the electromagnetic valve has high control accuracy for the alternating ventilation, so that the movement of the metering piston is more precise, so as to improve the accuracy of the pneumatic metering pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and other purposes, features and advantages of the present invention will become more clear through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the drawings are not deliberately scaled to the actual size, but the focus is on illustrating the subject matter of the present application.

[0037] Figure 1 A schematic diagram of the overall structure of a pneumatic metering pump provided in an embodiment of the utility model;

[0038] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0039] Figure 3 for Figure 1 Cross-sectional view of the middle BB;

[0040] Figure 4 for Figure 3 Cross-sectional view of CC;

[0041] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0042] Figure 6 A schematic diagram of the air circuit of a pneumatic metering pump provided in an embodiment of the utility model.

[0043] In the figure:

[0044] 100, one-way valve; 110, feed inlet; 120, discharge outlet; 130, material storage chamber;

[0045] 200, metering mechanism; 210, metering cylinder; 211, observation window; 220, metering piston; 230, metering inner cylinder;

[0046] 300, driving mechanism; 310, driving member; 320, driving piston; 330, driving cylinder; 331, first driving chamber; 332, second driving chamber; 333, ventilation joint; 340, driving inner cylinder;

[0047] 400, control mechanism; 410, solenoid valve; 411, first gas delivery port; 412, second gas delivery port; 413, feedback connector; 420, adjusting screw; 421, adjusting nut; 430, air exchange valve; 431, elastic member; 432, air exchange valve core; 433, air exchange valve core seat; 440, first throttle valve; 450, second throttle valve; 460, first lock column;

[0048] 500, first sealing ring;

[0049] 600, second sealing ring;

[0050] 700, first muffler; 710, second muffler; 720, third muffler. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0052] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0054] Combine the following Figures 1 to 6 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any limitation to the present invention.

[0055] See also Figures 1 to 6 An embodiment of the utility model provides a pneumatic metering pump, which includes a one-way valve 100, a metering mechanism 200, a driving mechanism 300 and a control mechanism 400.

[0056] The one-way valve 100 has an inlet 110 , an outlet 120 and a storage chamber 130 which are interconnected.

[0057] The metering mechanism 200 includes a metering cylinder 210 and a metering piston 220. The metering cylinder 210 is connected to the material storage chamber 130, and the metering piston 220 is slidably connected in the metering cylinder 210. When the metering piston 220 slides in the metering cylinder 210, the volume of the material storage chamber 130 can be changed.

[0058] That is, the volume of the storage chamber 130 can change as the metering piston 220 slides.

[0059] When the metering piston 220 moves along the second axial direction (i.e., the second axial direction) of the metering cylinder 210, Figure 2 When the right side of the material storage chamber 130 slides, the volume of the material storage chamber 130 increases, a negative pressure is formed in the material storage chamber 130, and external materials can enter the material storage chamber 130 through the feed inlet 110.

[0060] When the metering piston 220 moves along the first axial direction (i.e., the adjacent Figure 2 The volume of the material storage chamber 130 becomes smaller, and the material storage chamber 130 is squeezed by the metering piston 220. The material in the material storage chamber 130 can be discharged to the outside through the discharge port 120. The reciprocating motion of the metering piston 220 along the first direction and the second direction can realize the material transportation.

[0061] The driving mechanism 300 includes a driving member 310, a driving piston 320 and a driving cylinder 330. The first end of the driving member 310 is connected to the metering piston 220, the second end of the driving member 310 is connected to the driving piston 320, and the driving piston 320 is slidably connected in the driving cylinder 330. The driving member 310 can be a driving plunger, the first end of the driving plunger is connected to the metering piston 220, and the second end of the driving plunger is connected to the driving piston 320. When the driving piston 320 reciprocates in the driving cylinder 330, the driving plunger can drive the metering piston 220 to slide back and forth in the metering cylinder 210, so as to alternately change the volume of the storage chamber 130.

[0062] The driving piston 320 is slidably connected in the driving cylinder 330 , and the driving cylinder 330 can be divided into a first driving chamber 331 and a second driving chamber 332 .

[0063] The control mechanism 400 includes a solenoid valve 410 and an adjusting screw 420 .

[0064] The solenoid valve 410 has a first gas delivery port 411 and a second gas delivery port 412 . The first gas delivery port 411 is communicated with the first driving chamber 331 , and the second gas delivery port 412 is communicated with the second driving chamber 332 .

[0065] The solenoid valve 410 controls the first gas delivery port 411 and the second gas delivery port 412 to alternately ventilate, and can control the driving piston 320 to slide back and forth along the axial direction of the driving cylinder 330 .

[0066] Specifically, when the electromagnetic valve 410 controls the first gas delivery port 411 to open, gas enters the first driving chamber 331, which can make the driving piston 320 slide along the second axial direction of the driving cylinder 330. Through the action of the driving plunger, the metering piston 220 also slides along the second axial direction of the metering cylinder 210 (i.e., the second axial direction of the metering cylinder 210). Figure 2 The volume of the storage chamber 130 increases by sliding the slide member 120 onto the right side of the storage chamber 130.

[0067] When the electromagnetic valve 410 controls the second gas delivery port 412 to open, gas enters the second driving chamber 332, which can make the driving piston 320 slide along the first axial direction of the driving cylinder 330. Through the action of the driving plunger, the metering piston 220 also slides along the first axial direction of the metering cylinder 210 (i.e., the adjacent Figure 2 The left side of the material storage chamber 130 slides, and the volume of the material storage chamber 130 becomes smaller.

[0068] That is, the solenoid valve 410 controls the first gas delivery port 411 and the second gas delivery port 412 to alternately ventilate, so that the volume of the material storage chamber 130 can be changed alternately to realize the transportation of materials.

[0069] The adjusting screw 420 extends into the second driving chamber 332 in a spiral connection manner, and can adjust the sliding stroke of the driving piston 320 in the driving cylinder 330 .

[0070] When the adjusting screw 420 rotates forward, the adjusting screw 420 moves along the first axial direction of the driving cylinder 330, and the first end of the adjusting screw 420 can abut against the driving piston 320, so that the sliding stroke of the driving piston 320 in the driving cylinder 330 becomes shorter. Through the action of the driving member 310 (driving plunger), the sliding stroke of the metering piston 220 in the metering cylinder 210 also becomes shorter, thereby reducing the maximum volume of the storage chamber 130, that is, the rated metering value of the pneumatic metering pump becomes smaller.

[0071] When the adjusting screw 420 is reversed, the adjusting screw 420 moves in the second axial direction of the driving cylinder 330, and the first end of the adjusting screw 420 can abut against the driving piston 320, so that the sliding stroke of the driving piston 320 in the driving cylinder 330 becomes longer. Through the action of the driving member 310 (driving plunger), the sliding stroke of the metering piston 220 in the metering cylinder 210 is also lengthened, thereby increasing the maximum volume of the storage chamber 130, that is, the rated metering value of the pneumatic metering pump becomes larger.

[0072] That is to say, by adjusting the rotation operation of the screw 420, the sliding stroke of the driving piston 320 in the driving cylinder 330 can be adjusted, and the movement stroke of the driving member 310 can also be adjusted, thereby adjusting the sliding stroke of the metering piston 220 in the metering cylinder 210 to adjust the rated metering value of the pneumatic metering pump.

[0073] It can be understood that the pneumatic metering pump provided in the embodiment of the utility model controls the reciprocating sliding motion of the driving piston 320 in the driving cylinder 330 by setting a solenoid valve 410 having a first air delivery port 411 and a second air delivery port 412, and uses a driving member 310 to respectively connect the driving piston 320 and the metering piston 220 to control the reciprocating sliding motion of the metering piston 220 in the metering cylinder 210; at the same time, an adjusting screw 420 is used to extend into the second driving chamber 332 in a spiral connection to adjust the sliding stroke of the driving piston 320 in the driving cylinder 330, and under the connection action of the driving member 310, the metering piston The sliding stroke of 220 in the metering cylinder 210 can also be adjusted by the adjusting screw 420; the alternating ventilation of the first air supply port 411 and the second air supply port 412 by the solenoid valve 410, and the spiral adjustment of the adjusting screw 420, can make the movement control of the metering piston 220 easier, and the movement of the metering piston 220 can be controlled without more control components to achieve the adjustment of the rated metering value, which can simplify the structure of the metering pump and reduce the manufacturing cost. In addition, the solenoid valve 410 has high control accuracy for the alternating ventilation, so that the movement of the metering piston 220 is more precise, so as to improve the accuracy of the pneumatic metering pump.

[0074] Combination Figures 3 to 5 In some embodiments of the present invention, the control mechanism 400 also includes a ventilation valve 430 .

[0075] The air exchange valve 430 is disposed on the driving cylinder body 330 , and the air exchange valve 430 extends into the first driving chamber 331 . The air exchange valve 430 is communicated with the solenoid valve 410 .

[0076] The driving piston 320 is driven along the first axial direction (i.e., the first direction) of the driving cylinder 330. Figure 2 When the driving piston 320 slides to the bottom of the first driving chamber 331 of the driving cylinder 330, the driving piston 320 abuts against the ventilation valve 430, and the first gas delivery port 411 of the solenoid valve 410 outputs gas. The gas flows into the first driving chamber 331, which can drive the driving piston 320 to slide toward the second driving chamber 332 (that is, to slide in the second axial direction of the driving cylinder 330).

[0077] The driving piston 320 is driven along the second axial direction of the driving cylinder 330 (i.e., the Figure 2The driving piston 320 slides toward the right side of the first driving chamber 331 (i.e., slides toward the first axial direction of the driving cylinder body 330) when the driving piston 320 abuts against the adjusting screw 420, the driving piston 320 separates from the ventilation valve 430, and the second gas delivery port 412 of the solenoid valve 410 outputs gas, and the gas flows into the second driving chamber 332, which can drive the driving piston 320 to slide toward the first driving chamber 331 (i.e., slide toward the first axial direction of the driving cylinder body 330).

[0078] In this embodiment, the pneumatic metering pump can feed back the sliding position of the driving piston 320 in the driving cylinder 330 to the solenoid valve 410 by setting a ventilation valve 430 in the first driving chamber 331, so that the solenoid valve 410 can more accurately adjust the alternating gas supply of the first gas supply port 411 and the second gas supply port 412, thereby improving the movement accuracy of the driving piston 320 and further improving the movement accuracy of the metering piston 220, thereby further improving the metering accuracy of the pneumatic metering pump.

[0079] Combination Figure 4 and Figure 5 Specifically, in some embodiments of the present invention, the ventilation valve 430 includes an elastic member 431 , a ventilation valve core 432 and a ventilation valve core seat 433 .

[0080] The elastic member 431 is disposed in the ventilation valve core seat 433 , and the elastic member 431 abuts against the ventilation valve core seat 433 and the ventilation valve core 432 respectively, so that the ventilation valve core 432 and the ventilation valve core seat 433 are telescopically connected.

[0081] The air exchange valve core seat 433 is disposed on the driving cylinder body 330 , and the air exchange valve core 432 extends into the first driving chamber 331 .

[0082] When the driving piston 320 abuts against the gas exchange valve core 432 , the gas in the first driving chamber 331 flows to the solenoid valve 410 through the gas exchange valve core 432 , so that the first gas delivery port 411 of the solenoid valve 410 is opened.

[0083] When the driving piston 320 is separated from the gas exchange valve core 432 , the gas in the first driving chamber 331 is disconnected from the electromagnetic valve 410 , so that the second gas delivery port 412 of the electromagnetic valve 410 is opened.

[0084] The elastic member 431 may be a gas spring, which is arranged in the gas valve core seat 433, the first end of the gas valve core 432 extends into the gas valve core seat 433 and abuts against the gas spring, the second end of the gas valve core 432 extends into the first driving chamber 331, and the gas valve core seat 433 may also be arranged in the gas passage and the gas joint 333 through the driving cylinder 330 and connected to the feedback joint 413 of the solenoid valve 410. In this way, the structure of the gas valve 430 is simpler, and the manufacturing cost of the pneumatic metering pump is further reduced.

[0085] Combination Figure 1In some embodiments of the present invention, the control mechanism 400 further includes a first throttle valve 440 and a second throttle valve 450 .

[0086] The first throttle valve 440 is disposed between the first gas delivery port 411 and the first driving chamber 331 , and the second throttle valve 450 is disposed between the second gas delivery port 412 and the second driving chamber 332 .

[0087] The first throttle valve 440 can control the flow rate of the gas entering the first drive chamber 331, and the second throttle valve 450 can control the flow rate of the gas entering the second drive chamber 332, thereby controlling the sliding speed of the drive piston 320, and then controlling the sliding speed of the metering piston 220, so that the rated metering value of the pneumatic metering pump can be easily adjusted by simply adjusting the corresponding throttle valve, which is easy to operate.

[0088] Furthermore, in order to visualize the adjustment of the rated metering value of the pneumatic metering pump and make the adjustment simpler and more convenient, in some embodiments of the utility model, the part of the adjusting screw 420 extending to the outside is provided with a scale. When the adjusting screw 420 is rotated to adjust the pneumatic metering pump, the metering value can be determined by reading the scale on the adjusting screw 420.

[0089] Combination Figure 2 In order to make the metering piston 220 slide more smoothly in the metering cylinder 210 to improve the accuracy of the pneumatic metering pump, in some embodiments of the present invention, the metering mechanism 200 further includes a metering inner cylinder 230. The metering inner cylinder 230 is disposed in the metering cylinder 210, and the metering piston 220 is slidably connected to the metering inner cylinder 230.

[0090] Of course, the driving mechanism 300 further includes a driving inner cylinder 340 , which is disposed in the driving cylinder body 330 , and the driving piston 320 is slidably connected to the driving inner cylinder 340 .

[0091] Furthermore, in order to improve the sealing between the metering piston 220 and the metering inner cylinder 230, and between the driving piston 320 and the driving inner cylinder 340, and thus make the movement of the driving piston 320 and the metering piston 220 more precise, thereby improving the accuracy of the pneumatic metering pump, in this embodiment, the pneumatic metering pump further includes a first sealing ring 500 and a second sealing ring 600.

[0092] The first sealing ring 500 is disposed between the metering piston 220 and the metering inner cylinder 230 , and the second sealing ring 600 is disposed between the driving piston 320 and the driving inner cylinder 340 .

[0093] The first sealing ring 500 and the second sealing ring 600 may be O-rings. Of course, O-rings may also be provided at the contact points between other components and the cylinder body, for example, an O-ring is also provided at the spiral connection point between the adjusting screw 420 and the driving cylinder body 330 to prevent the gas in the second driving chamber 332 from leaking and affecting the sliding movement of the driving piston 320.

[0094] In order to reduce the noise of the pneumatic metering pump, in some embodiments of the present invention, the pneumatic metering pump further includes a first muffler 700 , a second muffler 710 and a third muffler 720 .

[0095] The first muffler 700 is in communication with the first gas delivery port 411 , the second muffler 710 is in communication with the second gas delivery port 412 , and the third muffler 720 is in communication with the air exchange valve 430 .

[0096] Furthermore, in order to facilitate the operator to know the movement state of the metering piston 220 at any time, in some embodiments of the utility model, an observation window 211 is further provided on the metering cylinder 210. The observation window 211 is located between the metering piston 220 and the driving member 310.

[0097] Combination Figure 2 In some embodiments of the present invention, the control mechanism 400 further includes a first locking column 460. The first locking column 460 passes through the drive cylinder 330 through a spiral connection and abuts against the adjusting screw 420. After the adjusting screw 420 is adjusted, the first locking column 460 can lock the position of the adjusting screw 420 to prevent the adjusting screw 420 from loosening in its own axial direction under the impact of the driving piston 320 and affecting the rated metering value of the pneumatic metering pump, thereby further ensuring the accuracy of the pneumatic metering pump.

[0098] The adjusting screw 420 further includes an adjusting nut 421 . The adjusting nut 421 is fixed on the driving cylinder 330 . The adjusting screw 420 and the adjusting nut 421 are spirally connected.

[0099] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0100] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "some embodiments", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0101] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pneumatic metering pump, characterized in that: include: A one-way valve having an inlet, an outlet and a storage cavity that are interconnected; The metering mechanism comprises a metering cylinder and a metering piston, wherein the metering cylinder is connected to the material storage cavity, and the metering piston is slidably connected to the metering cylinder and is suitable for changing the volume of the material storage cavity; The driving mechanism comprises a driving member, a driving piston and a driving cylinder, wherein the first end of the driving member is connected to the metering piston, the second end of the driving member is connected to the driving piston, and the driving piston is slidably connected to the driving cylinder. The driving piston divides the driving cylinder into a first driving chamber and a second driving chamber; Control mechanism, including solenoid valve and adjusting screw, The solenoid valve has a first gas delivery port and a second gas delivery port, wherein the first gas delivery port is communicated with the first drive chamber, and the second gas delivery port is communicated with the second drive chamber. The solenoid valve controls the first gas delivery port and the second gas delivery port to alternately ventilate, so as to control the driving piston to slide back and forth along the axial direction of the driving cylinder body. The adjusting screw extends into the second driving cavity through a spiral connection, and is suitable for adjusting the sliding stroke of the driving piston in the driving cylinder.

2. The pneumatic metering pump according to claim 1, characterized in that: The control mechanism also includes a ventilation valve, The air exchange valve is arranged on the driving cylinder body and extends into the first driving chamber, and the air exchange valve is communicated with the solenoid valve. When the driving piston contacts the air exchange valve, the first air delivery port of the solenoid valve outputs gas, and the gas flows into the first driving chamber to drive the driving piston to slide toward the second driving chamber. When the driving piston is separated from the air exchange valve, the second gas delivery port of the solenoid valve outputs gas, and the gas flows into the second driving chamber to drive the driving piston to slide toward the first driving chamber.

3. The pneumatic metering pump according to claim 2, characterized in that: The ventilation valve comprises an elastic member, a ventilation valve core and a ventilation valve core seat; The elastic member is arranged in the ventilation valve core seat, and the elastic member abuts against the ventilation valve core seat and the ventilation valve core respectively, so that the ventilation valve core and the ventilation valve core seat are telescopically connected; The air exchange valve core seat is arranged on the driving cylinder body, and the air exchange valve core extends into the first driving chamber; When the driving piston contacts the gas exchange valve core, the gas in the first driving chamber flows to the solenoid valve through the gas exchange valve core, so that the first gas delivery port of the solenoid valve is opened. When the driving piston is separated from the gas exchange valve core, the gas in the first driving chamber is disconnected from the solenoid valve, so that the second gas delivery port of the solenoid valve is opened.

4. The pneumatic metering pump according to claim 1, characterized in that: The control mechanism further includes a first throttle valve and a second throttle valve. The first throttle valve is arranged between the first gas delivery port and the first driving chamber, and the second throttle valve is arranged between the second gas delivery port and the second driving chamber.

5. The pneumatic metering pump according to claim 1, characterized in that: The portion of the adjusting screw rod extending outward is provided with a scale.

6. The pneumatic metering pump according to claim 1, characterized in that: The metering mechanism further comprises a metering inner cylinder, the metering inner cylinder is arranged in the metering cylinder body, and the metering piston is slidably connected to the metering inner cylinder; The driving mechanism further comprises a driving inner cylinder, wherein the driving inner cylinder is arranged in the driving cylinder body, and the driving piston is slidably connected to the driving inner cylinder.

7. The pneumatic metering pump according to claim 6, characterized in that: Also includes a first sealing ring and a second sealing ring, The first sealing ring is arranged between the metering piston and the metering inner cylinder, and the second sealing ring is arranged between the driving piston and the driving inner cylinder.

8. The pneumatic metering pump according to claim 2, characterized in that: Also includes a first muffler, a second muffler and a third muffler, The first muffler is communicated with the first gas delivery port, the second muffler is communicated with the second gas delivery port, and the third muffler is communicated with the ventilation valve.

9. The pneumatic metering pump according to any one of claims 1 to 8, characterized in that: The metering cylinder body is provided with an observation window, and the observation window is located between the metering piston and the driving member.

10. The pneumatic metering pump according to claim 9, characterized in that The control mechanism further comprises a first locking column, which passes through the driving cylinder body through a spiral connection and abuts against the adjusting screw.

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