A cut-off valve, lower cylinder structure and pneumatic plunger pump

Abstract

The present disclosure relates to a lower cutting valve, a lower cylinder structure and a pneumatic plunger pump, the lower cutting valve comprising a ring-shaped valve core and a shell arranged outside the valve core; the shell comprises a first part located at the peripheral side of the valve core and a second part extending inward from the upper end of the first part and covering the upper end of the valve core, and at least the part near the center of the upper surface of the second part forms an outward and downward inclined flow guide surface. The second part covering the upper end of the valve core is provided with a flow guide surface, which is beneficial to guide the material above the lower cutting valve to move outward, reduce the adverse effects of the material deposited and accumulated above the lower cutting valve on the lower cutting valve, and is beneficial to improve the service life of the lower cutting valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pump, in particular to a lower valve, a lower cylinder structure and a pneumatic plunger pump. BACKGROUND

[0002] The pneumatic plunger pump is often used to pump liquid material or liquid material with solid particles from a material cylinder. The valve is often used in the pneumatic plunger pump, which can be used for isolation of different spaces in the pump. If the material contains a large amount of high-hardness solid filler, the solid filler is easy to deposit and accumulate above the valve over time, which affects the use of the valve. SUMMARY

[0003] The first aspect of the present application provides a lower valve, which comprises a ring-shaped valve core and a shell arranged outside the valve core; the shell comprises a first part located at the peripheral side of the valve core and a second part extending inward from the upper end of the first part and covering the upper end of the valve core, and at least the part near the center of the upper surface of the second part forms an outward and downward inclined flow guide surface.

[0004] Optionally, in the radial direction of the second part, the height of the flow guide surface gradually decreases from inside to outside.

[0005] Optionally, the flow guide surface is a conical surface.

[0006] Optionally, the material of the valve core is polyether ether ketone material.

[0007] Optionally, the inner side wall of the second part is provided with an annular accommodating groove opening inward, and a valve sealing ring is arranged in the accommodating groove.

[0008] Optionally, the valve core comprises a first ring part extending longitudinally and a second ring part extending outward from the lower end of the first ring part; the shell is sleeved outside the valve core, and the lower end of the first part abuts against the upper surface of the second ring part.

[0009] The second aspect of the present application provides a lower cylinder structure, which comprises a cylinder, a lifting rod arranged in the cylinder, a connecting rod, a feeding spoon, a piston assembly and a lower cutting valve as described above; wherein the cylinder is provided with a feeding port and a discharging port, and has a first chamber, a second chamber and a third chamber arranged in sequence in the up-down direction inside the cylinder, the discharging port is communicated with the first chamber, and the feeding port is located at the lower end of the third chamber; the piston assembly is a hollow structure, the piston assembly is sleeved on the outside of the lifting rod and can move up and down in the first chamber along with the lifting rod, a spacing space penetrating up and down is formed between the inner wall of the piston assembly and the lifting rod, and the outer side of the piston assembly is attached to the inner wall of the cylinder; the feeding spoon is connected to the lower end of the lifting rod and can move up and down along with the lifting rod and can pass through the feeding port;

[0010] During the lifting of the lifting rod, the bottom of the piston assembly is sealed, and a first space above the piston assembly and a second space below the piston assembly in the first chamber are isolated; the second space is communicated with the second chamber and the third chamber, and the material enters the third chamber under the action of the feeding spoon and moves upward;

[0011] During the lowering of the lifting rod, the second chamber and the third chamber are isolated, the bottom of the piston assembly can be opened, and the spacing space is communicated with the first space, the second space and the second chamber until the bottom of the piston assembly is sealed;

[0012] The feeding spoon is arranged at the lower end of the lifting rod through the connecting rod, the lower cutting valve is arranged in the second chamber and is attached and sleeved on the outside of the connecting rod, and the lower cutting valve can be lifted in the second chamber during the lifting of the connecting rod along with the lifting rod; during the lowering of the lifting rod, the lower cutting valve seals the connection between the second chamber and the third chamber, and during the lifting of the lifting rod, the lower cutting valve is lifted to make the second chamber communicated with the third chamber.

[0013] Optionally, the piston assembly comprises a hollow piston column, an upper locking member and a lower locking member sleeved on the outside of the piston column, and a blocking member and a first sealing ring fixed between the upper locking member and the lower locking member; wherein the blocking member is provided with an annular first mounting groove with an opening facing the outer circumferential side, and the first sealing ring is arranged in the first mounting groove; at least one of the outer circumferential side of the upper locking member and the lower locking member is provided with an annular second mounting groove, and a second sealing ring is arranged in the second mounting groove; the material rigidity of the blocking member is greater than the material rigidity of the first sealing ring.

[0014] Optionally, the first sealing ring is a trapezoidal sealing ring; and / or,

[0015] The second sealing ring is an O-ring; and / or,

[0016] The piston rod is integrally formed with the lower locking member; and / or

[0017] The blocking member includes a first blocking member located in the middle, a second blocking member located above the first blocking member, and a second blocking member located below the first blocking member; the upper end of the second blocking member abuts against the upper locking member, the second blocking member abuts against the lower locking member, the first blocking member and the second blocking member form a first mounting groove, and the first blocking member and the third blocking member form another first mounting groove.

[0018] A third aspect of the present invention provides a pneumatic plunger pump, including a drive device and a lower cylinder structure as described above; the drive device is driven to the lifting rod and is capable of driving the lifting rod to raise and lower to transport materials through the lower cylinder structure.

[0019] In the aforementioned cut-off valve of this application, by providing a guide surface in the second part at the upper end of the valve core, it is beneficial to guide the material above the cut-off valve to move outward, reduce the adverse effects of material sedimentation and accumulation on the cut-off valve, and improve the service life of the cut-off valve. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a pneumatic plunger pump according to an exemplary embodiment of this application;

[0021] Figure 2 This is a three-dimensional structural diagram of a lower cylinder block structure according to an exemplary embodiment of this application;

[0022] Figure 3 yes Figure 2 The side view of the lower cylinder block structure is shown.

[0023] Figure 4 It is along Figure 3 The sectional view of the lower cylinder block structure obtained by section line AA shown.

[0024] Figure 5 yes Figure 4 An enlarged schematic diagram of section B of the lower cylinder block structure is shown;

[0025] Figure 6 yes Figure 4 An enlarged schematic diagram of point C in the lower cylinder block structure shown;

[0026] Figure 7 This is an exploded view of a piston assembly according to an exemplary embodiment of this application;

[0027] Figure 8is an exploded view of a poppet valve according to an example embodiment of the present application;

[0028] Figure 9 is a perspective view of a poppet valve and valve seat according to an example embodiment of the present application;

[0029] Figure 10 is a cross-sectional view of a poppet valve and valve seat according to an example embodiment of the present application. DETAILED DESCRIPTION

[0030] The example embodiments will be described in detail in this disclosure with reference to the drawings. Whenever the shapes, relative arrangements, numerical expressions and other aspects of constituent elements described in the present disclosure are clearly described, the present disclosure is not limited only to what is explicitly described, and alternative embodiments can be included within the scope of the present disclosure. For example, the number of constituent elements and the connection types of a constituent element with other elements shown in the drawings can be changed. Also, even if a certain feature is not shown in some drawings, it is understood that this feature can be included in the present disclosure. Also, the size relationships or proportions of a constituent element shown in the drawings are for the purpose of illustration and explanation only and are not intended to limit the scope of the present disclosure. Also, the relative importance of constituent elements can be changed according to design, manufacture, use or other operational aspects. Therefore, specific shapes, numerical expressions and other technical terms used herein are merely used to describe specific embodiments, but are not intended to limit the present disclosure. Accordingly, the terms "comprise", "include", "comprising", "including", "have", "has", "have", "has", "containing", "contain" or similar terms are used inclusively and not exclusivity.

[0031] The terminology used in the present disclosure is solely for the purpose of describing particular embodiments and is not intended to limit the present disclosure. As used in the present disclosure and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0032] It should be understood that the use of "first", "second", and / or like designations in the present disclosure is intended to indicate the existence of a correspondence between or among the various elements denoted by such designations as opposed to describing a particular sequential or chronological order. Also, use of "one" or "the" or like designations is not intended to limit the number of items to a single item but rather means that at least one of those items are present. Unless otherwise indicated, "front", "back", "under", and / or "over", "upper", "lower", "left", "right", and / or like terms are not intended to be absolute designations but are relative terms in relation to the other elements described herein. "Including" and like terms are meant to encompass the elements listed thereafter and do not exclude the presence of additional, unrecited elements. "Connected" or "coupled" and like terms are not intended to be limited to a direct connection or coupling but also include indirect connections or couplings, such as through an intermediary.

[0033] Embodiments of the present application will be described below in detail with reference to the accompanying drawings. Features in the following embodiments and implementation forms can be combined with each other as long as there is no conflict.

[0034] Figure 1Fig. 1 is a structural schematic diagram of a pneumatic plunger pump 1000 according to an example embodiment of the present application. Please refer to Figure 1 , and if necessary, in combination with Figures 2 to 10 , it is shown. The pneumatic plunger pump 1000 can be used to pump liquid material or liquid material with solid particles out of a material cartridge, such as can be used to pump silica gel containing metal particles out of a silica gel packaging cartridge.

[0035] The pneumatic plunger pump 1000 includes a lower cylinder structure 100, a crossbeam 300, a drive rod 400, a connecting rod 500, a supporting plate 600, a wheel disc 700, and a sleeve rod 800. The wheel disc 700 is fixedly connected to the lower end of the lower cylinder structure 100. The sleeve rod 800 is fixed to the opposite sides of the supporting plate 600. The drive rod 400 is arranged in the sleeve rod 800 in a liftable manner. The crossbeam 300 is arranged at the upper end of the drive rod 400 and can be lifted with the drive rod 400. The lower cylinder structure 100 is fixed below the crossbeam 300 through the connecting rod 500, so that the lower cylinder structure 100 and the wheel disc 700 can be lifted with the crossbeam 300. During use of the pneumatic plunger pump 1000, the material cartridge is arranged on the supporting plate 600, the wheel disc 700 is inserted into the material cartridge and can be attached to the cartridge wall of the material cartridge and can be lifted relative to the cartridge wall of the material cartridge to be lifted to a corresponding position according to the amount of material in the material cartridge.

[0036] The pneumatic plunger pump 1000 further includes a driving device 200. The driving device 200 is arranged at the upper end of the lower cylinder structure 100 and is used to be drivingly connected to the lifting structure in the lower cylinder structure 100 to drive the corresponding lifting structure to be lifted. The driving device 200 is a pneumatic driving device, such as a pneumatic motor.

[0037] The lower cylinder structure 100 includes a cylinder 10, a lifting rod 60 arranged in the cylinder 10, a feeding spoon 40, and a piston assembly 20. The cylinder 10 is provided with a feeding port 102 and a discharging port 101, and the inside of the cylinder 10 has a first chamber 11, a second chamber 12, and a third chamber 13 arranged in sequence in the up-down direction. The discharging port 101 is in communication with the first chamber 11, and the feeding port 102 is located at the lower end of the third chamber 13. For example, in some embodiments, the feeding port 102 can be an opening at the lower end of the third chamber. The first chamber 11, the second chamber 12, and the third chamber 13 can be formed by independent cylinder side walls or by the same cylinder side wall.

[0038] Please refer to Figure 4 , in some embodiments, the first chamber 11 referred to herein can be understood as the internal space corresponding to the D section area of the cylinder 10 shown in Figure 4 . Correspondingly, the second chamber 12 can be understood as the internal space corresponding to the E section area of the cylinder 10 shown in Figure 4 , and the third chamber 13 can be understood as the internal space corresponding to the F section area of the cylinder 10 shown in Figure 4The internal space corresponding to the F-section area of the shown cylinder body 10.

[0039] The piston assembly 20 is specifically arranged in the first chamber 11, and the outer side of the piston assembly 20 is attached to the inner wall of the cylinder body 10. The piston assembly 20 is sleeved on the lifting rod 60 and can move up and down in the first chamber 11 along with the lifting rod 60. The inner wall of the piston assembly 20 and the lifting rod 60 form a through gap space 203.

[0040] The feeding spoon 40 is connected to the lower side of the lifting rod 60 and can move up and down along with the lifting rod 60 and can pass through the feeding port 102. The lifting rod 60 can be specifically connected to the lower side of the driving device 200 through the upper driving rod 50. The driving device 200 drives the lifting rod 60 to lift by directly driving the upper driving rod 50 to lift, so as to transport the material through the lower cylinder structure 100.

[0041] When the pneumatic plunger pump 1000 works, the bottom of the piston assembly 20 is sealed during the lifting of the lifting rod 60, and the first space above the piston assembly 20 in the first chamber 11 is isolated from the second space below the piston assembly 20. The second space is in communication with the second chamber 12 and the third chamber 13, and the material enters the third chamber 13 under the action of the feeding spoon 40 and continues to move upward along with the upward movement of the lifting rod 60. During the lifting of the lifting rod 60, the material in the first space is extruded upward and flows out of the discharging port 101.

[0042] During the descending of the lifting rod 60, the second chamber 12 and the third chamber 13 are isolated, the bottom of the piston can be opened, the gap space 203 is in communication with the first space, the second space and the second chamber 12, until the bottom of the piston is sealed. Correspondingly, the upper locking piece 21 includes a locking part 211 and a through part 212, the through part 212 forms a through hole 2120, and the gap space 203 is in communication with the first space through the through hole 2120. During the descending of the lifting rod 60, the second gap space 203 is in communication with the first space, the second space and the second chamber 12, and the material also flows upward and can flow out of the discharging port 101. It can be seen that during the lifting and descending of the lifting rod 60, the discharging port 101 has material output.

[0043] The lower cylinder structure 100 further comprises a connecting rod 70 and a lower cutting valve 30. The feeding spoon 40 is arranged at the lower end of the lifting rod 60 through the connecting rod 70, and the lower cutting valve 30 is arranged in the second chamber 12 and is sleeved on the outside of the connecting rod 70. The lower cutting valve 30 is subjected to the friction force of the connecting rod 70 and can be lifted in the second chamber 12 along with the connecting rod 70 during the lifting of the connecting rod 70 along with the lifting rod 60. During the lowering of the lifting rod 60, the lower cutting valve 30 can be lowered to seal the connection between the second chamber 12 and the third chamber 13. During the lifting of the lifting rod 60, the lower cutting valve 30 can be lifted to make the second chamber 12 communicate with the third chamber 13. The upper portion of the second chamber 12 is provided with a limiting wall 121 to limit the lifting movement of the lower cutting valve 30. After the lower cutting valve 30 is lifted to abut against the limiting wall 121 along with the connecting rod 70, the connecting rod 70 can continue to be lifted, but the lower cutting valve 30 does not continue to be lifted. When the lower cutting valve 30 is lowered to the connection between the second chamber 12 and the third chamber 13, the lower cutting valve 30 is limited at this position and cannot be lowered, and the connecting rod 70 can continue to be lowered.

[0044] It should be noted that the lifting rod 60 can be understood as a piston rod. The height of the lifting rod 60 is slightly greater than the height of the piston assembly 20. The structure size of the upper and lower ends of the lifting rod 60 is relatively large, and the upper end or the lower end can limit the upward and downward movement of the piston assembly 20 when the piston assembly 20 moves to abut against the upper end or the lower end. Under the action of the friction force of the inner wall of the cylinder 10, the piston assembly 20 can move upward and downward relative to the lifting rod 60. Specifically, when the lifting rod 60 starts to lift from the lower position, the piston assembly 20 is subjected to the downward friction force of the inner wall of the cylinder 10 and can be lowered relative to the lifting rod 60. When the lifting rod 60 is lowered from the high position, the piston assembly 20 is subjected to the upward friction force of the inner wall of the cylinder 10 and can move upward relative to the lifting rod 60.

[0045] The lower cylinder structure 100 can further comprise an upper cutting valve (not shown). The upper cutting valve is fixedly installed at the lower end of the lifting rod 60. During the lifting of the lifting rod 60, the piston assembly 20 can be lowered relative to the lifting rod 60 until abutting against the upper cutting valve, so as to realize the sealing of the bottom of the piston assembly 20. During the lowering of the lifting rod 60, the piston assembly 20 can move upward relative to the lifting rod 60 to separate from the upper cutting valve, so as to realize the communication of the spacing space 203 with the first space, the second space and the second chamber 12, until the upper cutting valve abuts against the bottom of the first chamber 11 (which can also be regarded as the connection between the first chamber and the second chamber), and the lower end of the piston assembly 20 abuts against the upper cutting valve, the bottom of the piston assembly 20 is sealed, that is, the piston assembly 20 is lowered to the lowest position, which is the critical state of the lifting movement of the lifting rod 60, and then the lifting rod 60 will be lifted.

[0046] The piston assembly 20 comprises a hollow piston column 26, an upper locking member 21, a lower locking member 22, a blocking member and a first sealing ring 24 fixed between the upper locking member 21 and the lower locking member 22. The blocking member is provided with a first annular mounting groove 201 with an opening facing the outer circumferential side, and the first sealing ring 24 is arranged in the first mounting groove 201. At least one of the upper locking member 21 and the lower locking member 22 is provided with a second annular mounting groove 202 on the outer circumferential side, and the second annular mounting groove 202 is provided with a second sealing ring 27. The material rigidity of the blocking member is greater than the material rigidity of the first sealing ring 24, so as to provide sufficient blocking and limiting effects to the first sealing ring 24.

[0047] It should be noted that, in some embodiments, the material of the blocking member is metal. The outer periphery of the first sealing ring and the outer periphery of the blocking member can be located on the same cylindrical surface, or the outer periphery of the first sealing ring can slightly protrude outward of the outer periphery of the blocking member, so as to ensure the sealing property of the first sealing ring. Similarly, the outer periphery of the second sealing ring and the outer periphery of the corresponding upper locking member 21 or lower locking member 22 can be located on the same cylindrical surface, or the outer periphery of the second sealing ring can slightly protrude outward of the outer periphery of the corresponding upper locking member 21 or lower locking member 22, so as to ensure the sealing property of the second sealing ring.

[0048] In some embodiments, the height of the first sealing ring 24 on the side close to the piston column 26 is less than the height of the first sealing ring 24 on the outer circumferential side, so that the thickness of the side of the sealing ring close to the inner wall of the cylinder is greater, which is beneficial to reduce the deformation amount of the first sealing ring, thereby improving the sealing property of the first sealing ring.

[0049] In some embodiments, in the radial direction of the first sealing ring 24, the height of the first sealing ring 24 gradually increases from the inside to the outside.

[0050] For example, in some embodiments, the first sealing ring 24 is a trapezoidal sealing ring as shown in FIG. 4. Figure 5

[0051] In some embodiments, the second sealing ring 27 is an O-shaped sealing ring.

[0052] The upper locking member 21 and the lower locking member 22 mentioned herein can be locking nuts. The upper locking member 21 and the lower locking member 22 can be fixedly assembled with the piston column 26 through threaded cooperation.

[0053] In some embodiments, the piston column 26 and the lower locking member 22 are integrally formed. Compared with the embodiment in which threads are arranged in the lower locking member 22 and the piston column 26, the structure strength of the piston column 26 and the lower locking member 22 is not affected due to the arrangement of threads, which is beneficial to improve the structure strength of the piston assembly 20 and improve the sealing property of the piston assembly 20 and the upper valve.

[0054] ​In some embodiments, the blocking piece includes a first blocking piece 23 located in the middle, a second blocking piece 25 located above the first blocking piece 23, and a third blocking piece 28 located below the first blocking piece 23; the upper end of the second blocking piece 25 abuts against the upper locking piece 21, the third blocking piece 28 abuts against the lower locking piece 22, and the first blocking piece 23 and the second blocking piece 25 form a first installation groove 201, and the first blocking piece 23 and the third blocking piece 28 form another first installation groove 201.

[0055] Based on the above structure of the piston assembly, when assembling the piston assembly, only the blocking piece and the first sealing ring need to be sequentially sleeved on the piston column 26, then the upper locking piece 21 is locked at the upper end of the piston column 26, and then the second sealing ring is installed. The assembly of each component of the piston assembly is simple, convenient and easy to operate. For the upper locking piece and the lower locking piece both provided with the second installation groove, the second sealing rings respectively arranged in the two second installation grooves can maintain the force balance of the upper part and the lower part of the piston assembly under a small deformation, which is beneficial to improve the sealing performance of the piston assembly. For the embodiment provided with the two first installation grooves and the corresponding first sealing rings, the upper and lower balance of the piston assembly can also be well maintained, which is beneficial to improve the sealing performance of the piston assembly.

[0056] Further, the lower cutting valve 30 includes an annular valve core 31 and an outer shell 32 arranged outside the valve core 31. The outer shell 32 includes a first part 321 located at the outer circumferential side of the valve core 31 and a second part 322 extending inward from the upper end of the first part 321 and covering the upper part of the valve core 31. At least the part near the center of the second part 322 on the upper surface of the second part 322 forms an outwardly and downwardly inclined flow guide surface 3220, which is beneficial to guide the material above the lower cutting valve to move outward, reduce the adverse effects of the material deposited and accumulated above the lower cutting valve, and improve the service life of the lower cutting valve.

[0057] In some embodiments, in the radial direction of the second part 322, the height of the flow guide surface 3220 gradually decreases from inside to outside. The flow guide surface 3220 can be the upper surface of the part structure near the center of the second part 322, or the upper surface of the entire second part 322.

[0058] Please refer to Figures 8 to 10 In some embodiments, the flow guide surface 3220 is a conical surface. Of course, the flow guide surface 3220 can also be other inclined surfaces, such as an arc-shaped concave surface or an arc-shaped convex surface in the direction from the center of the second part to the outside.

[0059] In some embodiments, the material of the valve core 31 is polyether ether ketone, which is beneficial to improve the structural strength of the valve core 31 and improve the service life of the valve core 31.

[0060] In some embodiments, the material of the shell 32 is metal, such as stainless steel, to improve the structural strength of the cut-off valve, prolong the service life of the cut-off valve, reduce the leakage of materials at the cut-off valve, and improve the material conveying capacity of the pneumatic plunger pump.

[0061] In some embodiments, the inner side wall of the second part 322 is provided with an annular accommodating groove 3201 opening inward, and the accommodating groove 3201 is provided with a valve sealing ring 33.

[0062] In some embodiments, the valve core 31 includes a first annular part 311 extending longitudinally and a second annular part 312 extending outward from the lower end of the first annular part 311. The shell 32 is sleeved outside the valve core 31, and the lower end of the first part 321 abuts against the upper surface of the second annular part 312.

[0063] The shell 32 can be connected by a screw 34. The screw 34 can be transversely provided in the first part 321 and the first annular part 311. In addition, the outer end of the screw 34 can be welded to the first part 321 of the shell 32, so that the shell 32 and the valve core 31 are assembled more firmly.

[0064] Further, the cylinder body 10 is provided with a valve seat 80 at the connection between the second chamber 12 and the third chamber 13. The cut-off valve 30 can specifically abut against the upper end of the valve seat 80 during the downward movement of the connecting rod 70, so as to realize the isolation between the second chamber 12 and the third chamber 13. Correspondingly, the lower end of the valve core 31 can be inwardly recessed to form an annular notch part 3120 to fit the valve seat 80.

[0065] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A lower cylinder block structure characterized by comprising: The application relates to a feeding device, which comprises a cylinder, a lifting rod arranged in the cylinder, a connecting rod, a feeding spoon, a piston assembly, an upper cutting valve and a lower cutting valve. During the lifting of the lifting rod, the piston assembly abuts against the upper cutting valve, the bottom of the piston assembly is sealed, a first space above the piston assembly in the first chamber is isolated from a second space below the piston assembly, the second space is communicated with the second chamber and the third chamber, and materials enter the third chamber and move upwards under the action of the feeding spoon. During the lowering of the lifting rod, the piston assembly is separated from the upper cutting valve, the second chamber and the third chamber are isolated, the bottom of the piston assembly can be opened, the interval space is communicated with the first space, the second space and the second chamber, and the bottom of the piston assembly is sealed until the piston assembly abuts against the upper cutting valve. The lower cutting valve comprises a ring-shaped valve core and an outer shell arranged outside the valve core. The feeding spoon is arranged at the lower end of the lifting rod through the connecting rod, the lower cutting valve is arranged in the second chamber and is arranged outside the connecting rod in a sleeving mode, and the lower cutting valve can be lifted in the second chamber during the lifting of the connecting rod along with the lifting rod; during the lowering of the lifting rod, the lower cutting valve seals the connection position of the second chamber and the third chamber, and during the lifting of the lifting rod, the lower cutting valve is lifted, so that the second chamber is communicated with the third chamber.

2. The lower cylinder block structure according to claim 1, characterized by The piston assembly comprises a hollow piston column, an upper locking piece, a lower locking piece, a blocking piece and a first sealing ring which are arranged outside the piston column in a sleeving mode, and a blocking piece and a first sealing ring which are fixed between the upper locking piece and the lower locking piece; wherein the blocking piece is provided with a ring-shaped first mounting groove with an opening facing the peripheral side, and the first sealing ring is arranged in the first mounting groove; at least one of the peripheral sides of the upper locking piece and the lower locking piece is provided with a ring-shaped second mounting groove, and the second mounting groove is provided with a second sealing ring; the material rigidity of the blocking piece is greater than that of the first sealing ring.

3. The lower cylinder block structure according to claim 2, characterized by The first sealing ring is a trapezoidal sealing ring; and / or The second sealing ring is an O-shaped sealing ring; and / or, The piston column is integrally formed with the lower locking member; and / or, The blocking member includes a first blocking member in the middle, a second blocking member above the first blocking member, and a third blocking member below the first blocking member; the upper end of the second blocking member is in abutment with the upper locking member, the third blocking member is in abutment with the lower locking member, the first blocking member and the second blocking member form a first installation groove, and the first blocking member and the third blocking member form another first installation groove.

4. The lower cylinder block structure of claim 1, wherein In the radial direction of the second part of the shell, the height of the flow guide surface gradually decreases from inside to outside.

5. The lower cylinder block structure according to claim 4, wherein The flow guide surface is a conical surface.

6. The lower cylinder block structure of claim 1, wherein The material of the valve core is polyether ether ketone material.

7. The lower cylinder block structure of claim 1, wherein The inner side wall of the second part is provided with an annular accommodating groove opening inward, and a valve sealing ring is arranged in the accommodating groove.

8. The lower cylinder structure according to any one of claims 1 to 7, characterized by, The valve core includes a first ring part extending longitudinally and a second ring part extending outward from the lower end of the first ring part; the shell is sleeved outside the valve core, and the lower end of the first part of the shell abuts against the upper surface of the second ring part.

9. A pneumatic piston pump, characterized in that The drive device is drivingly connected with the lifting rod and can drive the lifting rod to lift to deliver materials through the lower cylinder body structure. The drive device is drivingly connected with the lifting rod and can drive the lifting rod to lift to deliver materials through the lower cylinder body structure.

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