CN209990602U - Improved structure of plunger pump for water mist sand blasting machine - Google Patents

Abstract

The utility model relates to a plunger pump technical field, it discloses a plunger pump improvement structure that water smoke sand blasting machine used, including the switching-over part and the plunger pump part of independent equipment respectively, switching-over part and plunger pump part are arranged and are docked according to upper and lower position, the switching-over part includes the casing subassembly and sets up the reciprocating lever subassembly that can commutate the motion from top to bottom on the casing subassembly, the plunger pump part includes pump body subassembly and sets up the plunger subassembly that can reciprocate on the pump body subassembly, the reciprocating lever subassembly with the coaxial butt joint of plunger subassembly, the casing subassembly with through the fixed connection of a plurality of quantity of connecting screw bolts between the pump body subassembly; the reversing component is a reversing component with a cylinder body and a pneumatic piston. The utility model provides an inconvenient and its switching-over part frosts easily winter of conventional plunger pump maintenance and influence the drawback of power.

Description

Improved structure of plunger pump for water mist sand blasting machine

Technical Field

The utility model relates to a plunger pump technical field, concretely relates to plunger pump that water smoke sand blasting machine was used improves structure.

Background

In the prior art, a conventional plunger pump is generally adopted as a pressure water delivery device for a water mist sand blasting machine. The conventional plunger pump is not convenient to disassemble and maintain due to its structural problem, and its reversing part is easily frosted in winter to affect power and reduce its reliability. In addition, the conventional plunger pump has a large compression ratio, and cannot form the best matching when being matched with a water mist sand blasting machine for use, so that the water mist sand blasting effect is influenced.

Therefore, it is necessary to improve the structure of the existing plunger pump by reasonably optimizing the compression ratio and the flow rate according to the characteristics of the water mist blasting and combining the range of the mixing ratio of the water mist blasting medium and the working pressure range.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a plunger pump that water smoke sand blasting machine used improves structure aims at solving the inconvenient and easy drawback that frosts and influence power winter of conventional plunger pump maintenance. The specific technical scheme is as follows:

an improved structure of a plunger pump for a water mist sand blasting machine comprises a reversing component and a plunger pump component which are respectively and independently assembled, wherein the reversing component and the plunger pump component are arranged and butted according to the upper position and the lower position, the reversing component comprises a shell component and a reciprocating rod component which is arranged on the shell component and can move up and down in a reversing way, the plunger pump component comprises a pump body component and a plunger component which is arranged on the pump body component and can move up and down in a reversing way, the reciprocating rod component is coaxially butted with the plunger component, and the shell component is fixedly connected with the pump body component through a plurality of connecting studs; the reversing component is a reversing component with a cylinder body and a pneumatic piston.

In the technical scheme, the reversing component and the plunger pump component are arranged into independent assembled split components to form a modular structure, on one hand, the assembly and the maintenance are simplified, and on the other hand, the reversing component is the reversing component with the cylinder body and the pneumatic piston, so that compared with the traditional integrated plunger pump structure, the problem that the power is influenced by the fact that the reversing component frosts in winter can be effectively solved.

The utility model provides a housing assembly's concrete structure does: the shell component comprises a cylinder body, an upper cylinder cover is arranged at the upper end of the cylinder body, a lower cylinder cover is arranged at the lower end of the cylinder body, the reciprocating rod component comprises a pneumatic piston and a piston rod, the pneumatic piston is arranged in the cylinder body, the piston rod is connected in an inner hole of the pneumatic piston, the lower cylinder cover passes through the connecting stud and the pump body component, and the piston rod penetrates through the lower cylinder cover and the plunger component to be in coaxial butt joint.

The reversing component and the plunger pump component are connected through the connecting stud, so that the reversing component and the plunger pump component are convenient and quick to assemble and convenient to maintain.

The utility model provides a concrete structure of switching-over part does: the reversing component comprises an air distribution chamber arranged at the upper end of the upper cover of the air cylinder and a reversing rod connected between the air distribution chamber and the piston rod, the air distribution chamber comprises an upper reversing chamber, an air inlet chamber and a lower reversing chamber which are sequentially arranged from top to bottom and are separated from each other, the air inlet chamber is connected with an air inlet pipe, the upper reversing chamber is provided with a passage communicated with the upper cavity of the air cylinder body, the lower reversing chamber is provided with a passage communicated with the lower cavity of the air cylinder body, a movable reversing valve module used for communicating the air inlet chamber with the upper reversing chamber or communicating the air inlet chamber with the lower reversing chamber is arranged at the joint of the reversing rod and the air distribution chamber, the upper end of the piston rod is provided with an axial mounting hole, the lower end of the reversing rod is sequentially connected with a seat ring, a spring and a movable ring from bottom to top, and the reversing rod, and the movable ring and the seat ring are respectively in sliding fit with the axial mounting hole.

Preferably, a sliding matching surface is arranged between the air inlet chamber and the movable reversing valve module, the upper reversing chamber, the air inlet chamber and the lower reversing chamber are respectively provided with an orifice on the sliding matching surface, the air inlet chamber of the movable reversing valve module is communicated with the upper reversing chamber after moving upwards, and meanwhile, the air inlet chamber of the movable reversing valve module is communicated with the lower reversing chamber after moving downwards.

Preferably, the movable reversing valve module comprises a slider seat arranged on the upper part of the reversing rod and sliders respectively installed on the left side surface and the right side surface of the slider seat and capable of moving left and right, the sliders are tightly propped against the sliding matching surface through springs, and reversing holes are formed in the sliders.

Preferably, the front and rear parts of the slider seat are provided with horizontally arranged arc-shaped convex strips, and the upper end of the cylinder upper cover is provided with a roller shaft which horizontally abuts against the cam surface on the arc-shaped convex strips on the slider seat through a spring to control reversing in the direction opposite to the direction of the arc-shaped convex strips.

The utility model discloses the theory of operation that automatic switching-over operation is realized to well portable switching-over valve module is: when the movable reversing valve module on the reversing rod is in the position after moving upwards, the compressed air in the air inlet chamber is communicated with the upper reversing chamber, and the compressed air in the air inlet chamber enters the upper reversing chamber; because the upper reversing chamber is provided with a passage communicated with the upper cavity of the cylinder body, compressed air in the upper reversing chamber enters the upper cavity of the cylinder body to push the pneumatic piston to move downwards together with the piston rod, so that the plunger assembly coaxially butted with the piston rod is driven to move downwards; when the pneumatic piston moves downwards to an extreme position, the pneumatic piston stops moving, the pressure of compressed air in an upper cavity of the cylinder body is gradually increased, the compressed air with the increased pressure pushes a movable ring on the reversing rod to move downwards, the pressure applied by the compressed air to the movable ring is transmitted to a seat ring through a spring, and when the pressure of the compressed air is increased to a set pressure value, the seat ring drives the reversing rod to move downwards and enables a movable reversing valve module at the upper end of the reversing rod to move downwards; meanwhile, the direction change is realized after the movable reversing valve module moves downwards, so that the air inlet chamber is communicated with the lower reversing chamber, compressed air in the air inlet chamber enters the lower reversing chamber, and the compressed air in the lower reversing chamber enters the lower cavity of the air cylinder body to push the pneumatic piston to move upwards together with the piston rod so as to drive the plunger assembly which is coaxially butted with the piston rod to move upwards as the lower reversing chamber is provided with a passage communicated with the lower cavity of the air cylinder body; meanwhile, after the movable reversing valve module moves downwards, the cam surfaces of the arc-shaped convex strips on the sliding block seat are pressed on the roller shafts, the roller shafts exert acting force on the cam surfaces of the arc-shaped convex strips under the action of the springs to push the sliding block seat to move upwards, so that the movable reversing valve module is positioned at the position after moving upwards, reversing reset is realized, and automatic reversing is realized through the reciprocating circulation.

The arc-shaped convex strips which are horizontally arranged are arranged at the front part and the rear part of the sliding block seat, and the reversing reset is controlled by the roller shaft which is elastically pushed, so that the reversing operation has the advantages of stability, reliability, low noise and convenience in maintenance.

Among the plunger pump part, its pump body subassembly includes the pneumatic cylinder, connects the suction connector, the connection of pneumatic cylinder lower extreme are in the spit joint of pneumatic cylinder upper end, its plunger subassembly is including setting up plunger, setting in the pneumatic cylinder are in the plunger upper end be used for with the plunger rod that the piston rod is connected, be provided with the intercommunication on the plunger suction connector with spit out the passageway that connects suction connector with be provided with first check ball valve on the passageway between the plunger with be provided with second check ball valve on the passageway between the spit joint.

Preferably, the diameter of the pneumatic piston is 1.25-1.5 times of the diameter of the plunger.

The plunger pump with low compression ratio suitable for the water mist sand blasting machine can be formed by setting reasonable diameters of the pneumatic piston and the plunger.

The utility model discloses in, the gyro wheel axle passes through guide bar, spring and the tight take-up housing in sliding sleeve top. Preferably, the roller shaft is provided with a rolling sleeve which is contacted with the cam surface on the arc-shaped convex strip of the slider seat so as to reduce the friction force when the slider seat moves.

The utility model discloses in, pneumatic piston's upper end still is provided with stop nut.

The utility model has the advantages that:

first, the utility model discloses a plunger pump that water smoke sand blasting machine used improves structure sets the components of a whole that can function independently equipment through stating switching-over part and plunger pump part, forms modular structure, and the one side of which is favorable to simplifying assembly and maintenance, and on the other hand is because the switching-over part of switching-over part for having cylinder block and pneumatic piston, consequently compares with traditional integral type plunger pump structure, can effectively solve the switching-over part because frosting in winter and influence the problem of power.

Second, the utility model discloses a plunger pump that water smoke sand blasting machine used improves structure, its convenient assembling of structure that switching-over part and plunger pump part carry out the connection through connecting stud is swift, and has made things convenient for the maintenance.

Third, the utility model discloses a plunger pump that water smoke sand blasting machine used improves structure is provided with the arc sand grip that the level was arranged through the front and back position of take-up housing to through the technical scheme that the tight roller shaft control switching-over in elasticity top resets, its switching-over operation has steady reliable, low noise, easy maintenance's advantage.

Fourth, the utility model discloses a plunger pump that water smoke sand blasting machine was used improves structure through setting up reasonable pneumatic piston and plunger diameter, can form the plunger pump that is suitable for the low compression ratio that water smoke sand blasting machine was used.

Fifth, the utility model discloses a plunger pump that water smoke sand blasting machine used improves structure is provided with the rolling cover that contacts with the cam surface on the arc sand grip of take-up housing on the gyro wheel axle, frictional force when can effectively reducing the take-up housing and remove.

Drawings

Fig. 1 is a schematic structural diagram of the appearance of an improved structure of a plunger pump for a water mist sand blasting machine according to the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1 with respect to the reversing component;

FIG. 3 is a cross-sectional view (left side view) of the portion of FIG. 2 related to the traveling reversing valve module;

fig. 4 is a schematic view of the internal structure of the plunger pump component of fig. 1.

In the figure: 1. a reversing component, 2, a reciprocating rod component, 3, a pump body component, 4, a plunger component, 5, a connecting stud, 6, a cylinder body, 7, a pneumatic piston, 8, a cylinder upper cover, 9, a cylinder lower cover, 10, a piston rod, 11, an air distribution chamber, 12, a reversing rod, 13, an upper reversing chamber, 14, an air inlet chamber, 15, a lower reversing chamber, 16, an air inlet pipe, 17, a cylinder upper chamber, 18, a cylinder lower chamber, 19, a movable reversing valve module, 20, an axial mounting hole, 21, a seat ring, 22, (for seat ring position) spring, 23, a movable ring, 24, a sliding matching surface, 25, a slider seat, 26, a slider, 27, (for slider position) spring, 28, a reversing hole, 29, an arc-shaped convex strip, 30, (for arc-shaped convex strip position) spring, 31, a roller shaft, 32, a plunger pump component, 33, a shell component, 34, a hydraulic cylinder, 35, a suction joint, 36. the device comprises a discharge joint 37, a plunger 38, a plunger rod 39, a first one-way ball valve 40, a second one-way ball valve 41, a limiting nut 42, a guide rod 43 and a sliding sleeve.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Fig. 1 to 4 show an embodiment of an improved structure of a plunger pump for a water mist sand blasting machine according to the present invention, which includes a reversing component 1 and a plunger pump component 32 that are independently assembled, where the reversing component 1 and the plunger pump component 32 are arranged and butted according to the upper and lower positions, the reversing component 1 includes a housing component 33 and a reciprocating rod component 2 that is arranged on the housing component 33 and can perform a reversing motion up and down, the plunger pump component 32 includes a pump body component 3 and a plunger component 4 that is arranged on the pump body component 3 and can move up and down, the reciprocating rod component 2 is coaxially butted with the plunger component 4, and the housing component 33 is fixedly connected with the pump body component 3 through a plurality of connecting studs 5; the reversing component 1 is a reversing component with a cylinder block 6 and a pneumatic piston 7.

In the technical scheme, the reversing component 1 and the plunger pump component 32 are arranged into independent assembled split components to form a modular structure, so that on one hand, the assembly and the maintenance are simplified, and on the other hand, the reversing component 1 is the reversing component with the cylinder body 6 and the pneumatic piston 7, so that compared with the traditional integrated plunger pump structure, the problem that the power is influenced by frosting of the reversing component in winter can be effectively solved.

The specific structure of the housing assembly 33 in this embodiment is: the housing assembly 33 includes the cylinder block 6, the upper end of cylinder block 6 is provided with cylinder upper cover 8, the lower extreme of cylinder block 6 is provided with cylinder lower cover 9, reciprocating lever subassembly 2 is including setting up in the cylinder block 6 pneumatic piston 7, connection are in piston rod 10 in the pneumatic piston 7 hole, cylinder lower cover 9 passes through connecting stud 5 with pump body subassembly 3 fixed connection, piston rod 10 passes cylinder lower cover 9 with the coaxial butt joint of plunger subassembly 4.

The reversing component 1 and the plunger pump component 32 are connected through the connecting stud 5, so that the assembly is convenient and rapid, and the maintenance is convenient.

The specific structure of the reversing component 1 in this embodiment is as follows: the reversing component 1 comprises an air distribution chamber 11 arranged at the upper end of the cylinder upper cover 8 and a reversing rod 12 connected between the air distribution chamber 11 and the piston rod 10, the air distribution chamber 11 comprises an upper reversing chamber 13, an air inlet chamber 14 and a lower reversing chamber 15 which are sequentially arranged from top to bottom and are separated from each other, the air inlet chamber 14 is connected with an air inlet 16 pipe, the upper reversing chamber 13 is provided with a passage communicated with an upper chamber 17 of a cylinder body, the lower reversing chamber 15 is provided with a passage communicated with a lower chamber 18 of the cylinder body, a movable reversing valve module 19 for communicating the air inlet chamber 14 with the upper reversing chamber 13 or communicating the air inlet chamber 14 with the lower reversing chamber 15 is arranged at the joint of the reversing rod 12 and the air distribution chamber 11, the upper end of the piston rod 10 is provided with an axial mounting hole 20, and the lower end of the reversing rod 12 is sequentially connected with a seat ring 21, a spring 22 and a movable, the reversing rod 12, together with the seat ring 21, the spring 22 and the movable ring 23, is inserted into the axial mounting hole 20, and the movable ring 23 and the seat ring 21 are respectively in sliding fit with the axial mounting hole 20.

Preferably, a sliding matching surface 24 is arranged between the air inlet chamber 14 and the movable reversing valve module 19, the upper reversing chamber 13, the air inlet chamber 14 and the lower reversing chamber 15 are respectively provided with an orifice on the sliding matching surface 24, the air inlet chamber 14 is communicated with the upper reversing chamber 13 after the movable reversing valve module 19 moves upwards, and the air inlet chamber 14 is communicated with the lower reversing chamber 15 after the movable reversing valve module 19 moves downwards.

Preferably, the movable reversing valve module 19 includes a slider seat 25 disposed on the upper portion of the reversing lever 12, and sliders 26 respectively mounted on the left and right side surfaces of the slider seat 25 and movable in the left and right directions, wherein the sliders 26 are pressed against the sliding engagement surface 24 by a spring 27, and the sliders 26 are provided with reversing holes 28.

Preferably, the slider seat 25 is provided at front and rear portions thereof with horizontally arranged arc-shaped protruding strips 29, and the upper end of the cylinder upper cover 8 is provided with a roller shaft 31 which horizontally abuts against cam surfaces on the arc-shaped protruding strips 29 on the slider seat 25 via springs 30 so as to control reversing in a direction opposite to the direction of the arc-shaped protruding strips 29.

The working principle of the mobile reversing valve module 19 in this embodiment to realize automatic reversing operation is as follows: when the reversing valve works, compressed air is connected and enters the air inlet chamber 14 through the air inlet pipe 16, when the movable reversing valve module 19 on the reversing rod 12 is in the position after upward movement, the compressed air in the air inlet chamber 14 is communicated with the upper reversing chamber 13, and the compressed air in the air inlet chamber 14 enters the upper reversing chamber 13; because the upper reversing chamber 13 is provided with a passage communicated with the upper cavity 17 of the cylinder body, compressed air in the upper reversing chamber 13 enters the upper cavity 17 of the cylinder body, and pushes the pneumatic piston 7 to move downwards together with the piston rod 10, so that the plunger assembly 4 coaxially butted with the piston rod 10 is driven to move downwards; when the pneumatic piston 7 moves downwards to the extreme position, the pneumatic piston 7 stops moving, the pressure of compressed air in the upper cavity 17 of the cylinder body is gradually increased, the compressed air with the increased pressure pushes the movable ring 23 on the reversing rod 12 to move downwards, the pressure applied to the movable ring 23 by the compressed air is transmitted to the seat ring 21 through the spring 22, and when the pressure of the compressed air is increased to a set pressure value, the seat ring 21 drives the reversing rod 12 to move downwards and the movable reversing valve module 19 at the upper end of the reversing rod 12 moves downwards; the movable reversing valve module 19 is shifted downwards to realize reversing, so that the air inlet chamber 14 is communicated with the lower reversing chamber 15, compressed air in the air inlet chamber enters the lower reversing chamber 15, and the compressed air in the lower reversing chamber 15 enters the lower cavity 18 of the cylinder body because the lower reversing chamber 15 is provided with a passage communicated with the lower cavity 18 of the cylinder body, pushes the pneumatic piston 7 to move upwards together with the piston rod 10, and drives the plunger assembly 4 coaxially butted with the piston rod 19 to move upwards; meanwhile, after the movable reversing valve module 19 moves downwards, the cam surfaces of the arc-shaped convex strips 29 on the slider seat 25 of the movable reversing valve module are pressed against the roller shafts 31 (as shown in fig. 3), and the roller shafts 31 exert force on the cam surfaces of the arc-shaped convex strips 29 under the action of the springs 30 to push the slider seat 25 to move upwards, so that the movable reversing valve module 19 is in the position after moving upwards, thereby realizing reversing reset, and realizing automatic reversing by the reciprocating cycle.

The technical scheme that the arc-shaped convex strips 29 which are horizontally arranged are arranged at the front part and the rear part of the sliding block seat 25, and the reversing reset is controlled by the roller shaft 31 which is elastically pushed tightly is adopted, so that the reversing operation has the advantages of stability, reliability, low noise and convenience in maintenance.

In the plunger pump member 32 of the present embodiment, the pump body unit 3 includes a hydraulic cylinder 34, a suction joint 35 connected to a lower end of the hydraulic cylinder 34, and a discharge joint 36 connected to an upper end of the hydraulic cylinder 34, and the plunger unit 4 includes a plunger 37 provided in the hydraulic cylinder 34, and a plunger rod 38 provided at an upper end of the plunger 37 and connected to the piston rod 10, the plunger 37 is provided with a passage for communicating the suction joint 35 and the discharge joint 36, the passage between the suction joint 35 and the plunger 37 is provided with a first check ball valve 39, and the passage between the plunger 37 and the discharge joint 36 is provided with a second check ball valve 40.

Preferably, the diameter of the pneumatic piston 7 is 1.25 to 1.5 times of the diameter of the plunger 37.

By setting the diameters of the pneumatic piston 7 and the plunger 37 to be appropriate, a plunger pump having a low compression ratio suitable for the water mist blasting machine can be formed.

In this embodiment, the roller shaft 31 abuts against the slider seat 25 via the guide rod 42, the spring 30 and the sliding sleeve 43. Preferably, the roller shaft 31 is provided with a rolling sleeve contacting with the cam surface of the arc-shaped convex strip 29 of the slider seat 25 to reduce the friction force when the slider seat 25 moves.

In this embodiment, the upper end of the pneumatic piston 7 is further provided with a limit nut 41.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The improved structure of the plunger pump for the water mist sand blasting machine is characterized by comprising a reversing part and a plunger pump part which are respectively and independently assembled, wherein the reversing part and the plunger pump part are arranged and butted according to the upper position and the lower position, the reversing part comprises a shell assembly and a reciprocating rod assembly which is arranged on the shell assembly and can move in a reversing way up and down, the plunger pump part comprises a pump body assembly and a plunger assembly which is arranged on the pump body assembly and can move up and down in a reciprocating way, the reciprocating rod assembly is coaxially butted with the plunger assembly, and the shell assembly is fixedly connected with the pump body assembly through a plurality of connecting studs; the reversing component is a reversing component with a cylinder body and a pneumatic piston.

2. The improved structure of the plunger pump for the water mist sand blasting machine according to claim 1, wherein the housing assembly comprises the cylinder block, an upper cylinder cover is arranged at the upper end of the cylinder block, a lower cylinder cover is arranged at the lower end of the cylinder block, the reciprocating rod assembly comprises the pneumatic piston arranged in the cylinder block and a piston rod connected in an inner hole of the pneumatic piston, the lower cylinder cover is fixedly connected with the pump body assembly through the connecting stud, and the piston rod passes through the lower cylinder cover and is coaxially butted with the plunger assembly.

3. The improved plunger pump structure of claim 2, wherein the reversing component comprises an air distribution chamber arranged at the upper end of the upper cover of the cylinder and a reversing rod connected between the air distribution chamber and the piston rod, the air distribution chamber comprises an upper reversing chamber, an air inlet chamber and a lower reversing chamber which are sequentially arranged from top to bottom and are separated from each other, the air inlet chamber is connected with an air inlet pipe, the upper reversing chamber is provided with a passage communicated with the upper chamber of the cylinder body, the lower reversing chamber is provided with a passage communicated with the lower chamber of the cylinder body, a movable reversing valve module used for communicating the air inlet chamber with the upper reversing chamber or communicating the air inlet chamber with the lower reversing chamber is arranged at the joint of the reversing rod and the air distribution chamber, the upper end of the piston rod is provided with an axial mounting hole, and the lower end of the reversing rod is sequentially connected with a seat ring, a seat ring and, The reversing rod, the seat ring, the spring and the movable ring are inserted into the axial mounting hole together, and the movable ring and the seat ring are respectively in sliding fit with the axial mounting hole.

4. The improved plunger pump structure for water mist sand blasting machine as claimed in claim 3, wherein a sliding fitting surface is provided between the air inlet chamber and the movable reversing valve module, the upper reversing chamber, the air inlet chamber and the lower reversing chamber are respectively provided with an orifice on the sliding fitting surface, the air inlet chamber of the movable reversing valve module is communicated with the upper reversing chamber after moving up, and the air inlet chamber of the movable reversing valve module is communicated with the lower reversing chamber after moving down.

5. The improved plunger pump structure for the water mist sand blasting machine according to claim 4, wherein the movable reversing valve module comprises a slider seat arranged at the upper part of the reversing rod, and sliders respectively installed at the left side surface and the right side surface of the slider seat and capable of moving left and right, the sliders are tightly propped against the sliding matching surface through springs, and reversing holes are formed in the sliders.

6. The improved plunger pump structure for water mist sand blasting machine according to claim 5, characterized in that the front and rear parts of the slide block seat are provided with horizontally arranged arc-shaped convex strips, and the upper end of the cylinder upper cover is provided with a roller shaft which horizontally abuts against the cam surface on the arc-shaped convex strip on the slide block seat through a spring to control reversing in the direction opposite to the direction of the arc-shaped convex strips.

7. The improved structure of the plunger pump for the water mist sand blasting machine according to claim 2, characterized in that the plunger pump component comprises a hydraulic cylinder, a suction joint connected to the lower end of the hydraulic cylinder, and a discharge joint connected to the upper end of the hydraulic cylinder, the plunger component comprises a plunger arranged in the hydraulic cylinder, and a plunger rod arranged at the upper end of the plunger and used for being connected with the piston rod, a passage for communicating the suction joint with the discharge joint is arranged on the plunger, a first check ball valve is arranged on the passage between the suction joint and the plunger, and a second check ball valve is arranged on the passage between the plunger and the discharge joint.

8. The improved structure of the plunger pump for the water mist sand blasting machine according to claim 7, characterized in that the diameter of the pneumatic piston is 1.25-1.5 times of the diameter of the plunger.

9. The improved plunger pump structure for water mist sand blasting machine as claimed in claim 6, wherein the roller shaft is provided with a rolling sleeve contacting with the cam surface on the arc-shaped convex strip of the slider seat.

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