WO2020048204A1

WO2020048204A1 - Pumping machine

Info

Publication number: WO2020048204A1
Application number: PCT/CN2019/093914
Authority: WO
Inventors: 连彬; 李永久; 毛志兵; 何旭辉
Original assignee: 三一汽车制造有限公司
Priority date: 2018-09-03
Filing date: 2019-06-28
Publication date: 2020-03-12
Also published as: CN108799040A

Abstract

A pumping machine, comprising a conveying cylinder (26, 27), and a main oil cylinder (28, 29) provided at one end of the conveying cylinder (26, 27), wherein a piston is provided in the conveying cylinder (26, 27); a piston rod of the main oil cylinder (28, 29) is connected to the piston of the conveying cylinder (26, 27) to drive the piston of the conveying cylinder (26, 27) to conduct reciprocating movement in the conveying cylinder (26, 27); the other end of the conveying cylinder (26, 27) is connected to a grout sucking pipe by means of a grout sucking valve (30, 31) and is connected to a grout discharging pipe by means of a grout discharging valve (32, 33); the grout sucking valve (30, 31) and the grout discharging valve (32, 33) are one-way valves, wherein at least one of the one-way valves comprises a valve body (3), a plug (4), and an elastic piece (5); an inlet (6) and an outlet (7) are provided on the valve body (3); the plug (4) is used for connecting and disconnecting the inlet (6) and the outlet (7) of the valve body (3); and the elastic piece is used for pushing the plug (4) to disconnect the inlet (6) and the outlet (7) of the valve body (3). The pumping machine is simple in structure, low in manufacturing costs, and good in synchronization.

Description

Pumping machinery

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on September 3, 2018, with application number 201811020139.7, and the invention name is "a pumping machine", the entire contents of which are incorporated herein by reference.

Technical field

This application relates to the field of construction machinery, and in particular, to a pumping machine.

Background technique

At present, the commonly used pumping machinery for slurry transportation includes belt conveyors, screw conveyors, screw pumps, plunger pumps, diaphragm pumps, etc. Among them, belt conveyors, screw conveyors, screw pumps, etc. are subject to structural principles. Limitations: Generally, the transportation distance is not far, the transportation displacement is small, and it is difficult to transport sludge with high water content; the plunger pump has a complicated structure, high manufacturing cost, and is sensitive to impurities in the transportation fluid; the diaphragm pump has high energy consumption, The diaphragm is easily damaged when transporting high-temperature and corrosive fluids. When the diaphragm is working, the agitation frequency is high, which is easy to damage, causing high maintenance costs, and its displacement and lift are also limited; The valve manufacturing requirements are very high, which has led to the S-valve piston concrete pump not only having a complicated structure, but also high cost, and inconvenient use and maintenance.

The invention with the patent number ZL201620139166.6 provides a piston mud conveying pump, which includes a main feed pipe, a main discharge pipe, two material cylinders and two oil cylinders, and one end of the two material cylinders corresponds to two corresponding ones. The cylinder is connected. The delivery pump also includes two inlet hydraulic control check valves and two outlet hydraulic control check valves. At the other end of the two material cylinders, a three-way pipe is connected to an inlet hydraulic control check valve and an Outlet hydraulically controlled check valves, the inlets of the two inlet hydraulically controlled check valves are connected together through pipelines and then connected to the main feed pipe, and the outlets of the two outlet hydraulically controlled check valves are connected together through pipelines and then connected to the general outlet. Material pipe; two inlet hydraulic control check valves and two outlet hydraulic control check valves are controlled by hydraulic cylinders to open and close.

The piston mud pump with this structure, two inlet hydraulic control check valves and two outlet hydraulic control check valves are controlled by hydraulic cylinders to open and close. There is a signal difference when reversing with the two oil cylinders. Time; and complex structure, high manufacturing costs.

Summary of the Invention

In view of this, the present application proposes a pumping machine with a simple structure, low manufacturing cost, good synchronization, or no out-of-synchronization problem.

In order to solve the above technical problems, the present application proposes a pumping machine, which includes a conveying cylinder and a main oil cylinder provided at one end of the conveying cylinder. The conveying cylinder is provided with a piston, a piston rod of the main oil cylinder and the conveying cylinder. The piston is connected to drive the piston of the conveying cylinder to reciprocate in the conveying cylinder. The other end of the conveying cylinder is connected to the suction pipe through a suction valve and the discharge pipe through a discharge valve. The suction valve and the discharge valve Is a check valve, wherein at least one check valve includes a valve body, a plug and an elastic member, the valve body is provided with an inlet and an outlet, and the plug is used to open and disconnect the valve body's inlet and Outlet, the elastic member is used for pushing the plug to disconnect the inlet and outlet of the valve body.

As an improvement of the above-mentioned pumping machine in one aspect, it further includes a fixed seat fixedly arranged in the valve body, the fixed seat includes a base, a connecting rod and a head seat, and the head seat is provided between the inlet and the outlet of the valve body and It is fixedly connected to the valve body, the head seat is provided with a flow hole, two ends of the connecting rod are respectively connected to the base and the head seat, the plug and an elastic member are sleeved on the connecting rod, The elastic member is disposed between the plug and the base, and the elastic member is used to push the plug to block the flow hole to disconnect the inlet and outlet of the valve body.

As an improvement of the above-mentioned pumping machine, the plug is provided with a pressure relief hole penetrating axially. When the plug opens the inlet and outlet of the valve body, the pressure relief hole and the overcurrent The holes are in a communicating state, and when the plug disconnects the inlet and the outlet of the valve body, the pressure relief hole and the over-flow hole are in a disconnected state.

As an improvement of the above-mentioned pumping machine on one hand, it further includes a limit head and a limit pin, the head seat is provided with a step hole, and one end of the connecting rod passes through the base and the limit head in turn and then passes through the limit. The position head and the limit pin of the connecting rod are locked, and both ends of the position limit head are axially limited by the step hole and the limit pin, respectively.

As an improvement of the above-mentioned pumping machine in one aspect, it further includes a shaft sleeve sleeved on the connecting rod, the connecting rod is provided with a shaft shoulder, and two ends of the shaft sleeve abut the base and the base respectively. The shaft shoulder, the plug and the shaft sleeve slidingly fit.

As an improvement of the above pumping machine in one aspect, an end of the shaft sleeve facing the base is provided with a convex portion, the shaft sleeve abuts the base through the convex portion, and the elastic member is a compression spring.

As an improvement of the above-mentioned pumping machine in one aspect, the valve body includes a front shell and a rear shell which are detachably connected.

As an improvement of the above-mentioned pumping machinery, it includes a directional valve, an oil tank, an oil pump, a driving device, and a hydraulic oil cooler. The oil inlet of the directional valve is connected to the oil pump and the oil tank in this order. The oil pump and the drive The device is connected, and the oil return port of the reversing valve is sequentially connected with a hydraulic oil cooler and a fuel tank;

The conveying cylinder includes a first conveying cylinder and a second conveying cylinder. The main oil cylinder includes a first main oil cylinder and a second main oil cylinder. The suction valve includes a first suction valve and a second suction valve. The discharge valve includes a first discharge valve and a second discharge valve. The two working oil ports of the reversing valve are respectively connected to the first cavity of the first main cylinder and the first cavity of the second main cylinder. The second cavity of the oil cylinder is in communication with the second cavity of the second main oil cylinder. The piston rod of the first main oil cylinder is connected to the piston in the first conveying cylinder, and the piston rod of the second main oil cylinder is in the second conveying cylinder. The piston-less connection of the first conveying cylinder and the second conveying cylinder is connected to the suction pipe through the first suction valve and the second suction valve, respectively. The rod cavity is connected to the discharge pipe through a first discharge valve and a second discharge valve, respectively;

Alternatively, the suction valve includes a first suction valve and a second suction valve, and the discharge valve includes a first discharge valve and a second discharge valve, and the rodless cavity of the conveying cylinder passes through the first A suction valve is connected to the suction pipe and the discharge pipe is connected through the first discharge valve. The rod cavity of the conveying cylinder is connected to the suction pipe through the second suction valve and connected to the discharge through the second discharge valve. The two working oil ports of the directional valve are respectively connected to the rod cavity and the rodless cavity of the main oil cylinder.

As an improvement of the above-mentioned pumping machinery in one aspect, it includes a control device and a pressure detection device for detecting the pressure in the suction pipe and the discharge pipe. The control device and the driving device, the reversing valve, and the pressure A detection device is connected, and the control device is configured to control the driving device and the switching valve to operate according to the detection data of the pressure detection device.

As an improvement of the above-mentioned pumping machinery in one aspect, the control device includes an electric control cabinet body, a display and a communication module arranged on the electric control cabinet body, and the display is used for displaying the pressure in the suction pipe and the discharge pipe. Equipment operating parameters.

In the pumping machine of the present application, at least one non-return valve directly controls the opening and closing of the inlet and the outlet according to the fluid pressure difference on both sides of the inlet and the outlet, and the elastic member in the structure. The structure is simple and the manufacturing cost is low. Moreover, the opening and closing of the check valve of this structure is controlled by the pressure of the pipeline, and there is no problem of out-of-sync.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of the application are used to provide further understanding of the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application.

1 is a schematic structural diagram of a check valve in a specific embodiment of the present application;

FIG. 2 is an exploded schematic view of the check valve of FIG. 1; FIG.

3 is an exploded view of the one-way valve of FIG. 1 viewed from another angle;

4 is a schematic diagram of a control principle of a pumping machine in the first embodiment of the present application;

5 is a schematic diagram of a control principle of a pumping machine in a second embodiment of the present application;

6 is a schematic structural diagram of a pumping machine in a specific embodiment of the present application;

Figure 7 is a top view of Figure 6;

8 is a partially enlarged schematic diagram of FIG. 7;

FIG. 9 is a schematic structural diagram of a control device in this application in a specific embodiment.

The corresponding relationship between the reference numerals and parts in Figures 1 to 9 is:

1 suction pipe, 2 discharge pipe, 3 valve body, 4 plugs, 5 elastic parts, 6 inlets, 7 outlets, 8 base, 9 connecting rods, 10 head seats, 11 flow holes, 12 pressure relief holes, 13 Limit head, 14 limit pin, 15 step hole, 16 shaft sleeve, 17 shaft shoulder, 18 boss, 19 front shell, 20 rear shell, 21 directional valve, 22 fuel tank, 23 oil pump, 24 drive unit, 25 Hydraulic oil cooler, 26 first transfer cylinder, 27 second transfer cylinder, 28 first main cylinder, 29 second main cylinder, 30 first suction valve, 31 second suction valve, 32 first discharge valve, 33 second discharge valve, 34 control device, 35 electric control cabinet body, 36 display, 37 communication module.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The application will be described in detail below with reference to the drawings and embodiments.

Example one

As shown in FIG. 1 to FIG. 4 and FIG. 6 to FIG. 9, the present application provides a pumping machine. The pumping machine includes a conveying cylinder and a main oil cylinder disposed at one end of the conveying cylinder. The conveying cylinder is provided with a piston. The piston rod of the main oil cylinder is connected with the piston of the conveying cylinder to drive the piston of the conveying cylinder to reciprocate in the conveying cylinder. The other end of the conveying cylinder is connected to the suction pipe 1 through a suction valve and connected through a discharge valve. Discharge pipe 2, the suction valve and discharge valve are one-way valves, wherein at least one one-way valve includes a valve body 3, a plug 4 and an elastic member 5, and an inlet 6 is provided on the valve body 3. And outlet 7, the plug 4 is used to open and close the inlet 6 and outlet 7 of the valve body 3, and the elastic member 5 is used to push the plug 4 to open the inlet 6 and outlet of the valve body 3 7.

The difference between the present application and the existing structure is that both the suction valve and the discharge valve are one-way valves. Among them, at least one one-way valve includes a valve body 3, a plug 4 and an elastic member 5. An inlet 6 and an outlet 7 are provided, the plug 4 is used to open and close the inlet 6 and the outlet 7 of the valve body 3, and the elastic member 5 is used to push the plug 4 to disconnect the valve body 3 Inlet 6 and outlet 7, among which, the elastic member 5 can be a compression spring. The suction valve and the discharge valve using the special structure described above can automatically close the inlet 6 and pump the mud by using the elastic force of the elastic member 5 during pumping mud. The piston of the cylinder reciprocates in the conveying cylinder to form a positive pressure or a negative pressure in the conveying cylinder. The positive or negative pressure can open or close the suction valve and the discharge valve, and open and close the suction valve and the discharge valve. No other auxiliary equipment is needed in the process of the valve, and it has the characteristics of simple structure and convenient operation.

From the above, it can be known that at least one non-return valve of the pumping machine of the present application directly controls the connection and disconnection of the inlet 6 and the outlet 7 according to the fluid pressure difference on the sides of the inlet 6 and the outlet 7 and the elastic member 5 in its structure. Open, simple structure, low manufacturing cost, and the opening and closing of the one-way valve is controlled by the pressure of the pipeline, so there is no non-synchronization problem.

Specifically, it further includes a fixing seat fixedly disposed in the valve body 3. The fixing seat includes a base 8, a connecting rod 9, and a head seat 10. The head seat 10 is provided between the inlet 6 and the outlet 7 of the valve body 3. And fixedly connected to the valve body 3, the head seat 10 is provided with a flow hole 11, the two ends of the connecting rod 9 are respectively connected to the base 8 and the head seat 10, the plug 4 and the elastic member 5 The elastic member 5 is sleeved on the connecting rod 9, and the elastic member 5 is disposed between the plug 4 and the base 8. The elastic member 5 is used to push the plug 4 to block the flow hole 11 to The inlet 6 and the outlet 7 of the valve body 3 are disconnected.

In the foregoing embodiment, preferably, the plug 4 is provided with a pressure relief hole 12 penetrating axially. When the plug 4 opens the inlet 6 and the outlet 7 of the valve body 3, the pressure relief hole 12 and The through-flow hole 11 is in a communicating state. When the plug 4 disconnects the inlet 6 and the outlet 7 of the valve body 3, the pressure relief hole 12 and the through-flow hole 11 are in a disconnected state. In other words, the plug 4 is provided with a pressure relief hole 12 at a position offset from the flow hole 11, and the pressure relief hole 12 is located between the flow hole 11 and the connecting rod 9. 12 can mainly play two roles. The first point is that when the pressure is too large, the pressure relief hole 12 can play a good pressure relief effect, reduce the damage to the parts by the pressure, and extend the service life of the parts. The second point is The mud flow is increased, and when the plug 4 opens the inlet 6 and the outlet 7 of the valve body 3, the mud can be shunted to the pressure relief hole 12.

In the foregoing embodiment, preferably, in order to reduce the damage caused to the connecting rod 9 by the direct sliding friction between the connecting rod 9 and the plug 4, a shaft sleeve 16 sleeved on the connecting rod 9 is further provided. The connecting rod 9 is provided with A shaft shoulder 17 and two ends of the shaft sleeve 16 abut the base 8 and the shaft shoulder 17 respectively, and the plug 4 and the shaft sleeve 16 are slidingly fitted. More preferably, a protruding portion 18 is provided on an end of the sleeve 16 facing the base 8, and the sleeve 16 abuts the base 8 through the protruding portion 18.

Specifically, it further includes a limiting head 13 and a limiting pin 14. The head base 10 is provided with a step hole 15. One end of the connecting rod 9 passes through the base 8 and the limiting head 13 in order and then passes through the limiting position. The head 13 and the limiting pin 14 of the connecting rod 9 are locked. Both ends of the limiting head 13 are axially limited by the step hole 15 and the limiting pin 14 respectively.

In order to facilitate assembly, in a preferred embodiment, the valve body 3 includes a front shell 19 and a rear shell 20 that are detachably connected. When assembling, firstly, one end of the connecting rod 9 is passed through the shaft sleeve 16, the base 8, Limit head 13, then lock upper limit pin 14, the two ends of the sleeve 16 abut the base 8 and the shoulder 17 respectively, and then pass the other end of the connecting rod 9 through the elastic member 5, the plug 4 and the head seat 10 in order. The headrest 10 is fixedly connected to the front shell 19. The front shell 19 is provided with an inlet 6 and an outlet 7. The front shell 19 and the rear shell 20 are closed and the aforementioned components are enclosed by the front shell 19 and the rear shell 20. Inside the valve body 3.

In a specific embodiment, it includes a directional valve 21, an oil tank 22, an oil pump 23, a driving device 24, and a hydraulic oil cooler 25. The oil inlet of the directional valve 21 is connected to the oil pump 23 and the oil tank 22 in sequence. An oil pump 23 is connected to the driving device 24, and an oil return port of the switching valve 21 is connected to a hydraulic oil cooler 25 and an oil tank 22 in this order. The driving device 24 may be a motor or a hydraulic motor. The hydraulic oil cooler 25 is used for cooling the hydraulic oil to prevent the hydraulic oil from affecting the movement of the pumping machinery due to heat generation during the movement. The oil tank 22 is used to store the required hydraulic oil and ensure the smooth movement of the pumping machinery.

The conveying cylinder includes a first conveying cylinder 26 and a second conveying cylinder 27. The main oil cylinder includes a first main oil cylinder 28 and a second main oil cylinder 29. The suction valve includes a first suction valve 30 and a second suction cylinder. The slurry valve 31 includes a first slurry discharge valve 32 and a second slurry discharge valve 33. The two working oil ports of the reversing valve 21 are connected to the first cavity and the second cavity of the first main oil cylinder 28, respectively. The first cavity of the main cylinder 29, the second cavity of the first main cylinder 28, and the second cavity of the second main cylinder 29 are in communication, and the piston rod of the first main cylinder 28 is connected to the piston in the first conveying cylinder 26, The piston rod of the second main oil cylinder 29 is connected to the piston in the second conveying cylinder 27. The rodless chambers of the first conveying cylinder 26 and the second conveying cylinder 27 are respectively passed through the first suction valve 30 and the second suction cylinder. The slurry valve 31 is connected to the suction pipe 1, and the rodless chambers of the first delivery cylinder 26 and the second delivery cylinder 27 are connected to the slurry discharge pipe 2 through the first slurry discharge valve 32 and the second slurry discharge valve 33, respectively.

In the foregoing preferred embodiment, when the piston rod of the first main oil cylinder 28 is contracted, a large degree of vacuum is generated in the rodless cavity of the first conveying cylinder 26. Under the negative pressure of the rodless cavity of the first conveying cylinder 26, The first suction valve 30 is opened, the first discharge valve 32 is closed, and the mud is sucked into the rodless cavity of the first conveying cylinder 26 by the suction pipe 1. At the same time, the piston rod of the second main cylinder 29 is extended, and the second Local high pressure is generated in the rodless cavity of the conveying cylinder 27. Under the positive pressure of the rodless cavity of the second conveying cylinder 27, the second suction valve 31 is closed, the second discharge valve 33 is opened, and the mud is conveyed by the second conveying cylinder. The rodless cavity of 27 is discharged to the discharge pipe 2. When the piston rod of the first main oil cylinder 28 is extended, a local high pressure is generated in the rodless cavity of the first conveying cylinder 26. Under pressure, the first suction valve 30 is closed, the first discharge valve 32 is opened, and the mud is discharged from the rodless cavity of the first conveying cylinder 26 to the discharge pipe 2. At the same time, the piston rod of the second main oil cylinder 29 When contracted, a large vacuum is generated in the rodless cavity of the second conveying cylinder 27. Under the negative pressure of the rodless cavity of the second conveying cylinder 27, the second suction valve 31 is opened. , Second row slurry valve 33 is closed, a mud sucked into the second delivery cylinder rod chamber 27 by the suction pipe slurry. Such a cyclic operation can achieve continuous high-pressure long-distance transportation of mud.

More preferably, it includes a control device 34 and a pressure detection device for detecting the pressure in the suction pipe 1 and the discharge pipe 2. The control device 34 and the driving device 24, the reversing valve 21 and the The pressure detection device is connected, and the control device 34 is configured to control the driving device 24 and the switching valve 21 to operate according to the detection data of the pressure detection device.

Specifically, the control device 34 includes an electric control cabinet body 35 and a display 36 and a communication module 37 provided on the electric control cabinet body 35. The display 36 is used to display equipment operating parameters, and the equipment operating parameters include suction The pressure parameters in the pipe 1 and the slurry discharge pipe 2, the communication module 37 is used to establish communication with the upper computer of the pumping machine. Among them, the control device 34 may be a single-chip microcomputer or a PLC programmable controller, and the display 36 may directly display the running status of the current device. In this embodiment, since the communication device 37 is provided in the control device 34, the control device 34 can communicate with the upper computer of the pumping machine in a wired or wireless data transmission manner. The upper computer is generally a centralized system for sludge centralized processing. The control device 34 controls the startup and shutdown of the device through the received signals; it can also adjust the output displacement of the device in a timely manner through calculation based on the input pipeline flow information transmitted by the host computer.

In summary, at least one non-return valve of the pumping machine of the present application directly controls the connection and disconnection of the inlet 6 and the outlet 7 according to the fluid pressure difference between the sides of the inlet 6 and the outlet 7 and the elastic member 5 in its structure. Open, simple structure, low manufacturing cost, and the opening and closing of the one-way valve is controlled by the pressure of the pipeline, so there is no non-synchronization problem.

Example two

The difference between the second embodiment and the first embodiment lies in:

As shown in FIG. 5, the suction valve includes a first suction valve 30, a second suction valve 31, the discharge valve includes a first discharge valve 32, a second discharge valve 33, and the conveying cylinder. The rodless cavity is connected to the suction tube 1 through the first suction valve 30 and the drainage tube 2 through the first discharge valve 32. The rod cavity of the conveying cylinder is connected through the second suction valve 31 The suction pipe 1 is connected to the discharge pipe 2 through a second discharge valve 33, and the two working oil ports of the reversing valve 21 are respectively connected to the rod cavity and the rodless cavity of the main oil cylinder.

The reciprocating movement of the piston of the conveying cylinder of the pumping mechanism can realize the process of sucking and discharging twice. Compared with the pumping mechanism in the prior art, the pumping mechanism provided by the present application enhances the pumping mud operation. The continuity greatly improves the work efficiency, and has the characteristics of simple structure and convenient production and processing.

The above are only preferred embodiments of this application, and are not intended to limit this application. Any modification, equivalent replacement, or improvement made within the spirit and principle of this application shall be included in this application. Within the scope of protection.

Claims

A pumping machine includes a conveying cylinder and a main oil cylinder provided at one end of the conveying cylinder. A piston is arranged in the conveying cylinder, and a piston rod of the main oil cylinder is connected with a piston of the conveying cylinder to drive the piston of the conveying cylinder. The conveying cylinder is reciprocated, and the other end of the conveying cylinder is connected to the suction pipe through a suction valve and the discharge pipe through a discharge valve, wherein the suction valve and the discharge valve are one-way valves, wherein at least There is a one-way valve including a valve body, a plug and an elastic member. The valve body is provided with an inlet and an outlet. The plug is used to open and close the inlet and outlet of the valve body. The elastic member is used for The plug is pushed to disconnect the inlet and outlet of the valve body.
The pumping machine according to claim 1, further comprising a fixed seat fixedly disposed in the valve body, the fixed seat including a base, a connecting rod, and a head seat, the head seat being provided between an inlet and an outlet of the valve body. And the valve body is fixedly connected to each other, the head seat is provided with a flow hole, two ends of the connecting rod are respectively connected to the base and the head seat, and the plug and the elastic member are sleeved on the connecting rod Preferably, the elastic member is disposed between the plug and the base, and the elastic member is used to push the plug to block the flow hole to disconnect the inlet and outlet of the valve body.
The pumping machine according to claim 2, wherein the plug is provided with a pressure relief hole penetrating axially, and when the plug opens the inlet and outlet of the valve body, the pressure relief hole and the The over-flow hole is in a connected state, and when the plug disconnects the inlet and the outlet of the valve body, the pressure relief hole and the over-flow hole are in an off state.
The pumping machine according to claim 2, further comprising a limiting head and a limiting pin, the head seat is provided with a step hole, and one end of the connecting rod passes through the base and the limiting head in order and then passes A limit pin penetrating through the limit head and the connecting rod is locked, and two ends of the limit head are axially limited through the step hole and the limit pin, respectively.
The pumping machine according to claim 2, further comprising a shaft sleeve sleeved on the connecting rod, a shaft shoulder is provided on the connecting rod, and two ends of the shaft sleeve abut the base and the base, respectively. The shaft shoulder, the plug and the shaft sleeve are slidingly fitted.
The pumping machine according to claim 5, wherein an end of the shaft sleeve facing the base is provided with a convex portion, the shaft sleeve abuts against the base through the convex portion, and the elastic member is a compression spring.
The pumping machine according to claim 1, wherein the valve body includes a front case and a rear case that are detachably connected.
The pumping machine according to any one of claims 1 to 7, comprising: a directional valve, an oil tank, an oil pump, a driving device, and a hydraulic oil cooler, and an oil inlet of the directional valve is sequentially connected to an oil pump and an oil tank. The oil pump is connected with the driving device, and the oil return port of the reversing valve is connected with a hydraulic oil cooler and a fuel tank in sequence;

The conveying cylinder includes a first conveying cylinder and a second conveying cylinder. The main oil cylinder includes a first main oil cylinder and a second main oil cylinder. The suction valve includes a first suction valve and a second suction valve. The discharge valve includes a first discharge valve and a second discharge valve. The two working oil ports of the reversing valve are respectively connected to the first cavity of the first main cylinder and the first cavity of the second main cylinder. The second cavity of the oil cylinder is in communication with the second cavity of the second main oil cylinder. The piston rod of the first main oil cylinder is connected to the piston in the first conveying cylinder, and the piston rod of the second main oil cylinder is in the second conveying cylinder. The piston-less connection of the first conveying cylinder and the second conveying cylinder is connected to the suction pipe through the first suction valve and the second suction valve, respectively. The rod cavity is connected to the discharge pipe through a first discharge valve and a second discharge valve, respectively;

Alternatively, the suction valve includes a first suction valve and a second suction valve, and the discharge valve includes a first discharge valve and a second discharge valve, and the rodless cavity of the conveying cylinder passes through the first A suction valve is connected to the suction pipe and the discharge pipe is connected through the first discharge valve. The rod cavity of the conveying cylinder is connected to the suction pipe through the second suction valve and connected to the discharge through the second discharge valve. The two working oil ports of the directional valve are respectively connected to the rod cavity and the rodless cavity of the main oil cylinder.
The pumping machine according to claim 8, comprising: a control device and a pressure detection device for detecting the pressure in the suction pipe and the discharge pipe, the control device and the driving device, the reversing valve, and a pressure detecting device. The pressure detection device is connected, and the control device is configured to control the driving device and the switching valve to operate according to the detection data of the pressure detection device.
The pumping machine according to claim 9, wherein the control device comprises an electric control cabinet body and a display and a communication module arranged on the electric control cabinet body, the display is used for displaying the operating parameters of the equipment, and the equipment is operating The parameters include pressure parameters in the suction pipe and the discharge pipe, and the communication module is used to establish communication with a host computer of the pumping machine.