Symmetrically distributed hollow shaft double eccentric adjustable mechanism and method of use

Abstract

The application discloses a kind of symmetric distribution's hollow shaft double eccentric adjustable mechanism and use method, it is related to metrological pump technical field, including shell and two groups of plunger movably connected in its inside, the lower of shell is symmetrically provided with two groups of cylinder body, metering cavity is opened in the inside of cylinder body, the outside of cylinder body is connected with upper feeding portion and lower feeding portion by extraction pipe, the upper feeding portion includes upper feed pipe and upper discharge pipe, the lower feeding portion includes lower feed pipe and lower discharge pipe, further include: slow pressure portion, it is set to upper feeding portion and lower feeding portion other side, including fixed box, storage cavity is opened in the inside of fixed box;Moving part, movably connected in the inside of fixed box, for changing the communication loop of fixed box and metering cavity, cross pipe is opened in the inside of moving part;The present application is through flow detection compensation, fault discrimination, feed automatic switching and reverse flushing, realize on-line clearing block not shutdown;And matching replenishment amount as needed, guarantee fluid continuous stable delivery.

Description

Technical Field

[0001] This invention relates to the field of metering pump technology, and in particular to a symmetrically distributed hollow shaft double eccentric adjustable mechanism and its usage method. Background Technology

[0002] In the process of fluid transportation, precise control of fluid transportation has become a key link to improve the overall energy efficiency and optimize the operating performance. Traditional fluid transportation components have limitations in terms of control accuracy, energy consumption control and operating stability, making it difficult to meet the needs of refined and low-energy use. Metering pumps, on the other hand, rely on the volumetric working principle to achieve stable quantitative transportation and flexibly adjust the fluid transportation state according to the actual operating conditions, providing important support for precise fluid transportation.

[0003] Chinese patent application CN116447113A discloses a permanent magnet electromagnetic metering pump, including a pump head. The pump head has a one-way suction valve and a discharge valve at both ends. The pump head is fixedly connected to a pump head connector, and a pump chamber is formed between the pump head and the pump head connector. A diaphragm is provided between the pump head and the pump head connector.

[0004] Chinese patent application CN113217322A discloses a metering pump, including a drive end housing and a connecting rod, an eccentric structure, and a stroke length adjustment mechanism respectively disposed within the drive end housing. The connecting rod includes an assembly portion, and the eccentric structure is slidably disposed within the assembly portion of the connecting rod, allowing the connecting rod to move relative to the drive end housing.

[0005] The above technical solutions have some problems in use. For example, the adjustable plunger mechanism adopts a single-sided eccentric structure, and the eccentric force distribution is seriously uneven during operation. At the same time, the fluid pumping of a single metering chamber is not continuous, resulting in obvious fluid pulses at the outlet. When the total amount of fluid flowing inside the extraction pipe of the existing device decreases, it does not have an automatic flow compensation function, and it cannot quickly determine the cause of the flow drop, let alone quickly locate the specific blocked or leaking pipe. Summary of the Invention

[0006] The purpose of this invention is to provide a symmetrically distributed hollow shaft double eccentric adjustable mechanism and its usage method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a symmetrically distributed hollow shaft double eccentric adjustable mechanism, comprising a housing and two sets of plungers movably connected inside it, two sets of cylinders symmetrically arranged below the housing, each cylinder having a metering chamber inside, and a feeding section and a discharging section connected to the outside of the cylinders via extraction pipes, the feeding section including an upper feed pipe and an upper discharge pipe, the discharging section including a lower feed pipe and a lower discharge pipe, and further comprising: The pressure relief section is located on the other side of the loading and unloading sections, and includes a fixed box with a storage cavity inside the fixed box. The movable component is movably connected inside the fixed box and is used to change the connection loop between the fixed box and the metering chamber. The movable component has cross pipes inside.

[0008] Preferably, the storage cavity is formed inside the fixed box and located above the moving part, for forming a communication loop with the feeding part.

[0009] Preferably, one end of the upper feed pipe is connected to the storage tank and the other end is connected to the storage cavity, and one end of the upper discharge pipe is connected to the storage cavity and the other end is connected to the extraction pipe, for conveying fluid into the metering cavity.

[0010] Preferably, one end of the lower feed pipe is connected to the material preparation tank via the pump body, and one end of the lower discharge pipe is connected to the extraction pipe, which is used to drive the moving part to move and change the connection loop of the metering chamber.

[0011] Preferably, the upper discharge pipe is equipped with an upper flow detector to detect the flow rate of fluid discharged from the upper discharge pipe to the extraction pipe, and the lower discharge pipe is equipped with a lower flow detector to detect the flow rate of fluid discharged from the lower discharge pipe to the extraction pipe.

[0012] Preferably, the cross pipe has an X-shaped structure, and the openings of the cross pipe are respectively the upper left opening, the lower left opening, the upper right opening, and the lower right opening. The upper left opening can be connected to the upper feed pipe, the lower left opening can be connected to the lower feed pipe, the upper right opening can be connected to the upper discharge pipe, and the lower right opening can be connected to the lower discharge pipe. A drive component for controlling the up and down movement of the moving component is provided on the lower side of the moving component.

[0013] A method for using a symmetrically distributed hollow shaft double-eccentric adjustable mechanism, the method comprising the following steps: S1. When the flow detector detects a decrease in fluid flow rate per unit time in the upper discharge pipe, record L1 and calculate the flow rate difference L between L1 and the standard value L0. A ; S2. The moving component causes the cross pipe to move downwards, connecting the lower left opening to the lower feed pipe and the upper right opening to the lower discharge pipe. The lower discharge pipe compensates for the fluid in the extraction pipe, and the compensation amount is L. A ; S3. When the plunger sucks up material in the next unit of time, it maintains flow compensation. The upper flow detector detects the flow rate as L2 and determines whether L2 is equal to L1. If they are not equal, the pressure in the storage tank decreases. If they are equal, there is a blockage or leakage in the feeding section. S4. The driving component controls the moving component to move the cross pipe upward so that the upper left opening is connected to the upper feed pipe and the lower right opening is connected to the lower discharge pipe. The lower flow detector detects the flow rate as L3 and determines whether L3 is equal to L0. If L3 is not equal to L0, it is determined that the upper feed pipe is blocked or leaking. If L3 is equal to L0, it is determined that the upper discharge pipe is blocked or leaking.

[0014] Preferably, step S2 includes: starting the pump and conveying fluid along the lower feed pipe to the lower discharge pipe, and the lower flow detector detecting that the fluid replenishment in the lower discharge pipe is L. A .

[0015] Preferably, S4 includes: when the plunger moves downward along the metering chamber, a portion of the fluid in the extraction tube flows back into the upper discharge pipe for reverse flushing and unclogging.

[0016] The technical effects and advantages of this invention are as follows: 1. The present invention features a symmetrically arranged eccentric mechanism to achieve double eccentric transmission and alternating pumping and discharging of two sets of metering chambers. This solves the problems of uneven eccentric force, large operating impact, and high rotational inertia and energy consumption in the traditional single-sided plunger mechanism, thus ensuring continuous and stable fluid delivery.

[0017] 2. This invention uses flow detection and dynamic flow compensation to automatically replenish material when the feed rate in the extraction tube decreases, and promptly determines whether the decrease in flow rate is due to pipeline blockage or insufficient system pressure, thereby improving conveying stability and fault diagnosis efficiency.

[0018] 3. This invention solves the problems of needing to stop the machine for handling blockages, slow positioning of blocked pipes, and low maintenance efficiency by using an automatic switching and reverse flushing structure for cross-pipes, thus achieving online unblocking and continuous operation without stopping the machine. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of a portion of the hollow shaft structure of the present invention; Figure 2 This is a schematic cross-sectional view of a portion of the eccentric adjustment mechanism of the present invention; Figure 3 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 4 This is a schematic diagram of a portion of the cylinder block structure of the present invention; Figure 5 This is a schematic cross-sectional view of a portion of the metering cavity structure of the present invention; Figure 6 This is a schematic cross-sectional view of the first state of the cross-pipe structure of the present invention; Figure 7 This is a schematic cross-sectional view of the second state section of the cross-pipe structure of the present invention; Figure 8 This is a schematic cross-sectional view of the third state section of the cross-pipe structure of the present invention; Figure 9 This is a schematic cross-sectional view of the fourth state of the cross-pipe structure of the present invention.

[0020] In the diagram: 1. Plunger; 2. Eccentric adjustment mechanism; 3. Eccentric shaft; 4. Connecting rod; 5. Eccentric wheel; 6. Worm gear; 7. Hollow shaft; 8. Worm wheel; 9. Retaining ring; 10. Housing; 11. Pin-key composite component; 12. Metering chamber; 13. Feeding section; 1301. Upper feed pipe; 1302. Upper discharge pipe; 14. Discharging section; 1401. Lower feed pipe; 1402. Lower discharge pipe; 15. Pressure relief section; 1501. Fixed box; 1502. Storage chamber; 16. Moving component; 17. Cylinder body; 18. Upper flow detector; 19. Lower flow detector; 20. Cross pipe; 20a. Upper left opening; 20b. Lower left opening; 20c. Upper right opening; 20d. Lower right opening; 21. Extraction pipe; 22. Drive component. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Existing metering pump plunger adjustable mechanisms are mostly single-sided, with prominent core defects. The single-sided structure is prone to eccentricity, resulting in uneven operation and load distribution. The device must withstand huge rotational inertia and impact loads, leading to poor operational stability. There are gaps in the pumping and discharging of a single metering chamber, and fluid delivery is accompanied by obvious flow pulses, resulting in discontinuous output. Eccentric load imbalance also significantly increases energy loss. The control accuracy and energy efficiency are low, which cannot meet the low-energy consumption, precise, and stable fluid delivery requirements of energy-saving household appliances.

[0023] This invention provides, for example Figures 1 to 9The illustrated hollow shaft double eccentric adjustable mechanism includes a housing 10 and two sets of plungers 1 movably connected inside it. Two sets of cylinders 17 are symmetrically arranged below the housing 10. Each cylinder 17 has a metering chamber 12, which allows for flow extraction and discharge. The outer side of each cylinder 17 is connected to a loading section 13 and a discharging section 14 via an extraction pipe 21. A one-way valve is installed inside the extraction pipe 21, near the metering chamber 12, ensuring that fluid inside the extraction pipe 21 can only flow into the metering chamber 12 in one direction, while fluid inside the loading section 13 flows... The fluid feeding section 14 provides fluid compensation and also includes: a pressure-reducing section 15, which is located on the other side of the feeding section 13 and the feeding section 14, including a fixed box 1501, with a storage chamber 1502 inside the fixed box 1501, and the pressure-reducing section 15 adjusts the flow rate of the fluid entering the extraction pipe 21; and a moving part 16, which is movably connected inside the fixed box 1501 and is used to change the connection loop between the fixed box 1501 and the metering chamber 12. The moving part 16 can move up and down inside the fixed box 1501, and a cross pipe 20 is provided inside the moving part 16.

[0024] The double eccentric adjustable mechanism also includes an eccentric adjustment mechanism 2, an eccentric shaft 3, and an eccentric wheel 5 disposed inside the housing 10. The eccentric adjustment mechanism 2 is connected to the eccentric shaft 3 for transmission, and the eccentric wheel 5 is movably connected to the outer surface of the eccentric shaft 3. The eccentricity of the eccentric wheel 5 is adjusted by the rotation of the eccentric shaft 3, providing an adjustable eccentric basis for the movement of the mechanism.

[0025] The double eccentric adjustable mechanism also includes a worm 6, a hollow shaft 7, a worm wheel 8, and a retaining ring 9. The worm wheel 8 is embedded in the outer surface of the hollow shaft 7, and the worm 6 meshes with the worm wheel 8. The two form a meshing transmission pair to transmit power. The rotation of the worm 6 drives the rotation of the worm wheel 8, and the worm wheel 8 drives the rotation of the hollow shaft 7 to realize the pumping process. The retaining ring 9 is fixed to the outer surface of the hollow shaft 7 and abuts against the side wall of the worm wheel 8 to axially limit the worm wheel 8.

[0026] The double eccentric adjustable mechanism also includes a connecting rod 4 and a key-pin composite 11; one end of the connecting rod 4 is hinged to the eccentric wheel 5 and the other end is hinged to the plunger 1, converting the rotational motion of the eccentric wheel 5 into the reciprocating linear motion of the plunger 1, and the housing 10 positions and installs each part through the key-pin composite 11.

[0027] In use, after starting the mechanism operation switch, the operator rotates the handwheel with precise scale according to the fluid conveying conditions. The rotation of the handwheel directly drives the eccentric adjustment mechanism 2 to move, and the eccentric adjustment mechanism 2 then drives the eccentric shaft 3 to rotate synchronously. The handwheel scale corresponds one-to-one with the rotation angle of the eccentric shaft 3. The rotation of the eccentric shaft 3 directly adjusts the eccentricity of the eccentric wheel 5, precisely matching the required pumping volume of the metering chamber 12, and providing a suitable stroke basis for the stable reciprocating motion of the plunger 1.

[0028] External power input drives the worm 6 to rotate continuously. The rotation of the worm 6 directly drives the worm wheel 8 to rotate synchronously. The rotation of the worm wheel 8 then drives the hollow shaft 7 to rotate at a uniform and stable speed. The retaining ring 9 is fixed at the end of the hollow shaft 7 to axially limit the worm wheel 8, preventing the worm wheel 8 from axially moving during rotation and ensuring that the power transmission is stable and without deviation throughout the entire process.

[0029] The hollow shaft 7 serves as the core transmission component, continuously rotating to drive two sets of symmetrically distributed eccentric wheels 5 with a phase difference of 180° to rotate synchronously. The rotation of the eccentric wheels 5 directly drives the connecting rod 4 to reciprocate. The reciprocating motion of the connecting rod 4 then drives the plunger 1 to perform linear reciprocating motion, completing the smooth transition from rotational motion to linear reciprocating motion, and providing the core power for the metering chamber 12 to pump out fluid.

[0030] The housing 10 uses the key-pin composite 11 to precisely position and constrain all moving parts such as the eccentric wheel 5, connecting rod 4, and plunger 1, ensuring that the plunger 1 moves along the same axis and has a uniform reciprocating stroke, thus ensuring that the metering chamber 12 has a stable pumping volume and reliable conveying accuracy.

[0031] When the hollow shaft 7 rotates continuously, the left eccentric wheel 5 drives the left plunger 1 to move downward along the metering chamber 12 and compress the internal volume of the left metering chamber 12. The fluid in the chamber is discharged under the pressure of the plunger 1. At the same time, due to the 180° phase difference, the right eccentric wheel 5 drives the right plunger 1 to move upward along the metering chamber 12 and expands the internal volume of the right metering chamber 12. A negative pressure environment is formed in the chamber, and the fluid suction operation is completed. As the hollow shaft 7 rotates continuously, the phases of the two sets of eccentric wheels 5 switch synchronously. The left eccentric wheel 5 drives the left plunger 1 to move upward, and the left metering chamber 12 expands and suctions the fluid. The right eccentric wheel 5 drives the right plunger 1 to move downward, and the right metering chamber 12 compresses and discharges the fluid.

[0032] The two sets of plungers 1 always maintain a reverse alternating motion state with no gaps. When one set is pumping, the other set is pumping out synchronously. This cycle repeats to achieve continuous and stable fluid delivery and eliminates the flow pulse problem caused by the gap between the pumping and pumping of a single metering mechanism.

[0033] The symmetrically distributed double eccentric structure allows the operating forces of the two sets of metering chambers 12 to cancel each other out, significantly reducing the eccentric load, rotational inertia and impact load during the operation of the mechanism, effectively reducing energy consumption, and significantly improving the overall operational stability and service life of the machine.

[0034] The entire mechanism, from handwheel scale adjustment and power transmission to the alternating extraction and discharge of two sets of metering chambers 12, is seamless, efficient, and stable throughout the entire process. It accurately meets the core requirements of energy-saving household appliances, namely, precise fluid delivery, low-energy operation, and long service life. It fundamentally solves the technical problems of uneven eccentric load, large operating impact, and intermittent fluid delivery in traditional single-sided plunger mechanisms, providing stable and reliable volumetric metering and power support for precise fluid delivery.

[0035] Example 2 Based on the above embodiments, there are several unresolved technical defects. When the fluid flow rate in the extraction pipe 21 decreases, the device cannot automatically compensate for the fluid flow rate, nor can it determine whether the decrease in flow rate is due to pipe blockage, insufficient system pressure, or leakage in the pipe. When a certain pipe is blocked by impurities or leaks, the existing device can only be shut down for maintenance, causing an interruption in operation. It is also difficult to quickly locate the specific blocked pipe, which greatly reduces maintenance efficiency.

[0036] To solve the above problems, in this symmetrically distributed hollow shaft double eccentric adjustable mechanism, the storage cavity 1502 is formed inside the fixed box 1501 and located above the moving part 16, and the moving part 16 is sealed and slidably connected to the inner wall of the storage cavity 1502 to form a communication loop with the feeding part 13, so that the fluid inside the storage cavity 1502 can enter the feeding part 13 for circulation.

[0037] The feeding section 13 includes an upper feed pipe 1301 and an upper discharge pipe 1302. One end of the upper feed pipe 1301 is connected to the storage tank, and the other end is connected to the storage cavity 1502. Fluid inside the storage tank enters the storage cavity 1502 along the upper feed pipe 1301. One end of the upper discharge pipe 1302 is connected to the storage cavity 1502, and the other end is connected to the extraction pipe 21. It is used to deliver fluid into the metering cavity 12. Fluid inside the storage cavity 1502 is sent into the extraction pipe 21 along the upper discharge pipe 1302.

[0038] The feeding section 14 includes a lower feed pipe 1401 and a lower discharge pipe 1402. One end of the lower feed pipe 1401 is connected to the material tank through the pump body, and the other end of the lower discharge pipe 1402 is connected to the extraction pipe 21. It is used to drive the moving part 16 to move and change the connection circuit of the metering chamber 12. Therefore, the feeding section 14 is an independent part, which mainly adjusts the feeding section 13. Since the extraction pipe 21 is equipped with a one-way valve, when the plunger 1 moves downward along the metering chamber 12, the fluid inside the lower discharge pipe 1402 enters the upper discharge pipe 1302 and the upper feed pipe 1301 for reverse flushing and clearing.

[0039] An upper flow detector 18 is installed inside the upper discharge pipe 1302 to detect the flow rate of the fluid discharged from the upper discharge pipe 1302 into the extraction pipe 21. A lower flow detector 19 is installed inside the lower discharge pipe 1402 to detect the flow rate of the fluid discharged from the lower discharge pipe 1402 into the extraction pipe 21.

[0040] The cross pipe 20 has an X-shaped structure, and the openings of the cross pipe 20 are respectively the upper left opening 20a, the lower left opening 20b, the upper right opening 20c, and the lower right opening 20d. The upper left opening 20a can be connected to the upper feed pipe 1301, and the fluid inside the upper feed pipe 1301 can enter the upper left opening 20a. The lower left opening 20b can be connected to the lower feed pipe 1401, and the fluid inside the lower feed pipe 1401 can enter the lower left opening 20b. The upper right opening 20c can be connected to the upper discharge pipe 1302, and the fluid inside the upper right opening 20c can enter the upper discharge pipe 1302. The lower right opening 20d can be connected to the lower discharge pipe 1402, and the fluid inside the lower right opening 20d can enter the lower discharge pipe 1402. A drive component 22 for controlling the up and down movement of the moving component 16 is provided on the lower side of the moving component 16.

[0041] In summary, during use, the fluid in the storage tank is temporarily stored in the storage chamber 1502 via the upper feed pipe 1301 from the output end. The storage chamber 1502 is filled with fluid, and the entire upper feed pipe 1301, storage chamber 1502, upper discharge pipe 1302, and extraction pipe 21 are all filled with fluid and await subsequent extraction and discharge. Subsequently, as the plunger 1 reciprocates continuously within the metering chamber 12, the fluid inside the storage tank continuously enters the storage chamber 1502 via the upper feed pipe 1301 under the suction force. The fluid inside the storage chamber 1502 does not... The fluid flows into the upper discharge pipe 1302 and then into the extraction pipe 21. Finally, following the reciprocating motion of the plunger 1, it is regularly drawn into the metering chamber 12. The upper flow detector 18 records the fluid flow rate inside the upper discharge pipe 1302 as the standard value L0. The flow rates in this application are all within the controllable standard values ​​and can be adjusted appropriately according to actual needs. The moving part 16 is in the initial position, and the upper left port 20a, lower left port 20b, upper right port 20c, and lower right port 20d of the cross pipe 20 are all blocked (e.g., Figure 6 (As shown).

[0042] When the flow rate detector 18 of the upper discharge pipe 1302 on the left side detects a decrease in the flow rate of the fluid flowing into the extraction pipe 21 per unit time, and the upper flow rate detector 18 records the data per unit time as L1 and records the difference L between L1 and L0. A At this time, the drive unit 22 controls the moving part 16 to move downward, so that the lower left opening 20b is connected to the lower feed pipe 1401, and the upper right opening 20c is connected to the lower discharge pipe 1402. The lower feed pipe 1401 and the lower discharge pipe 1402 are connected through the cross pipe 20 (e.g., Figure 7 As shown), the left pump body starts and continuously delivers fluid along the lower feed pipe 1401 through the cross pipe 20 into the lower discharge pipe 1402. The lower discharge pipe 1402 continuously delivers fluid into the extraction pipe 21, thereby compensating for the fluid flow rate flowing into the extraction pipe 21. At this time, the lower flow rate detector 19 detects that the fluid compensation amount per unit time in the lower discharge pipe 1402 is L.A This ensures that the fluid flow rate entering the metering chamber 12 through the extraction tube 21 is uniform and stable. As the plunger 1 moves upward, the lower feed pipe 1401 continuously compensates for the flow rate inside the extraction tube 21 along the lower discharge pipe 1402, preventing changes in flow rate and subsequent pulse ejection of fluid.

[0043] As plunger 1 continues to move upward, the pump body maintains the compensation amount L in the lower feed pipe 1401 and lower discharge pipe 1402 within the next unit time. B At this time, the flow detector 18 inside the upper discharge pipe 1302 detects the flow rate of the fluid flowing into the extraction pipe 21 from the upper discharge pipe 1302 within a unit time and records the data as L2.

[0044] If L1 is not equal to L2, and L2 is less than L 1， This explains that as the metering chamber 12 continuously pumps and discharges, the fluid pressure inside the storage tank continuously decreases. This reduces the flow rate into the storage chamber 1502 from the upper feed pipe 1301 under the suction force of the plunger 1. Consequently, the flow rate of fluid from the storage chamber 1502 into the extraction pipe 21 via the upper discharge pipe 1302 continuously decreases. Therefore, as the pumping operation continues, the amount of fluid that needs to be supplied to the extraction pipe 21 from the lower feed pipe 1401 to the lower discharge pipe 1402 by the pump increases. That is, the fluid compensation amount per unit time in the lower discharge pipe 1402 is L. B Continue to increase and become greater than L A And L B It is equal to the difference between L0 and L2. Since the adjustment mechanism is double eccentric, when the left plunger 1 moves up and down for one cycle, the plunger 1 inside the right metering chamber 12 moves up and down and pumps out the fluid. The fluid flow compensated by the right pump body continues to increase. The amount of fluid supplied by the left and right pump bodies through the lower feed pipe 1401 to the lower discharge pipe 1402 increases alternately each time, further ensuring the stable discharge of the flow inside the subsequent metering chamber 12.

[0045] If L1 equals L2, it means that the flow rate detected by the upper flow detector 18 in the upper discharge pipe 1302 has returned to normal, that is, the pressure inside the storage tank has not changed, but there is a blockage or leakage in the feeding section 13. At this time, the driving component 22 controls the moving component 16 to move upward in the fixed box 1501. The upper left opening 20a of the cross pipe 20 inside the moving component 16 is connected to the upper feed pipe 1301, and the lower right opening 20d is connected to the lower discharge pipe 1402 (e.g., Figure 8 As shown), at this time, the fluid in the upper feed pipe 1301 flows into the lower discharge pipe 1402 through the cross pipe 20, and finally flows into the extraction pipe 21. At this time, the lower flow detector 19 in the lower discharge pipe 1402 records the data as L3 and compares the size of L3 with L0.

[0046] If L3 is not equal to L0, it indicates that there is a blockage or leakage in the upper feed pipe 1301, resulting in a reduction in the fluid flow rate into the extraction pipe 21. At this time, the driving component 22 drives the moving component 16 to move upward, so that the lower left opening 20b of the cross pipe 20 is connected to the upper feed pipe 1301, and the upper right opening 20c is reconnected to the upper discharge pipe 1302 (e.g., Figure 9 As shown), the pump increases the flow rate of fluid entering the lower feed pipe 1401, thereby increasing the flow rate of fluid entering the extraction pipe 21 through the lower discharge pipe 1402. At this time, the lower flow detector 19 records data as L4.

[0047] Part of the fluid in the extraction pipe 21 flows into the upper discharge pipe 1302, and the upper flow detector 18 records the data as L5; the value of L5 should be the difference between L4 and L0, so as to ensure that the fluid flow rate entering the extraction pipe 21 is always kept at L0 and to maintain the stability of the fluid entering the metering pump 12; when the plunger 1 moves downward along the metering chamber 12, the fluid entering the upper discharge pipe 1302 performs a reverse flushing of the upper feed pipe 1301 and the upper discharge pipe 1302; after the reverse flushing is completed, the moving part 16 moves downward to the initial position (e.g., Figure 6 As shown in the figure, the upper left opening 20a, lower left opening 20b, upper right opening 20c, and lower right opening 20d of the cross pipe 20 are all blocked.

[0048] At this time, the upper flow detector 18 detects the fluid flow rate in the extraction pipe 21 again and records the data as L6. If L6 equals L0, it means that there is a blockage in the upper feed pipe 1301 and it has been restored to normal through back flushing, and all parts are working normally. If L6 does not equal L0, it means that there is a leak in the upper feed pipe 1301, which cannot be solved by back flushing. At this time, a new upper feed pipe 1301 needs to be replaced and subsequent work needs to be carried out.

[0049] After replacing the upper feed pipe 1301, continue the above process, that is, the plunger 1 moves upward and causes the fluid inside the storage tank to enter the metering chamber 12 along the upper feed pipe 1301, the storage chamber 1502, the upper discharge pipe 1302 and the extraction pipe 21. If the flow rate value L7 detected by the upper flow detector 18 per unit time is still not equal to L0 and the value of L7 remains unchanged, it indicates that there is a blockage or leakage in the upper discharge pipe 1302. However, since the upper feed pipe 1301 and the upper discharge pipe 1302 have been flushed in reverse during the above process, it indicates that there is a leakage in the upper discharge pipe 1302. Therefore, replace the new upper discharge pipe 1302 and proceed with the subsequent work.

[0050] If L3 equals L0, it indicates that the upper feed pipe 1301 is normal and there is a blockage or leakage in the upper discharge pipe 1302, resulting in a reduction in the fluid flow rate into the extraction pipe 21. At this time, the driving component 22 drives the moving component 16 to move upward, so that the lower left opening 20b of the cross pipe 20 is connected to the upper feed pipe 1301, and the upper right opening 20c is reconnected to the upper discharge pipe 1302 (e.g., Figure 9 As shown), when the plunger 1 moves downward along the metering chamber 12, part of the fluid in the extraction pipe 21 flows into the upper feed pipe 1301 and the upper discharge pipe 1302 to perform reverse flushing and clearing of the upper feed pipe 1301; after the reverse flushing is completed, the moving part 16 moves downward to the initial position (as shown). Figure 6 As shown), the upper left port 20a, lower left port 20b, upper right port 20c, and lower right port 20d of the cross pipe 20 are all blocked. The plunger 1 moves upward, causing the fluid inside the storage tank to enter the metering chamber 12 along the upper feed pipe 1301, storage chamber 1502, upper discharge pipe 1302, and extraction pipe 21. At this time, the upper flow detector 18 detects the fluid flow rate in the extraction pipe 21 again and records the data as L8. If L8 equals L0, it means that there is a blockage in the upper discharge pipe 1302 and it has been restored to normal by backflushing, and all parts are working normally. If L8 does not equal L0, it means that there is a leak inside the upper discharge pipe 1302, which cannot be solved by backflushing. At this time, a new upper discharge pipe 1302 needs to be replaced and subsequent work can be carried out.

[0051] Example 3 A method for using a symmetrically distributed hollow shaft double eccentric adjustable mechanism includes the following steps: S1. When the upper flow detector 18 detects a decrease in the fluid flow rate within the upper discharge pipe 1302 per unit time, record L1 and calculate the flow rate difference L between L1 and the standard value L0. A .

[0052] S2. The moving part 16 moves the cross pipe 20 downward, so that the lower left opening 20b is connected to the lower feed pipe 1401, and the upper right opening 20c is connected to the lower discharge pipe 1402. The lower discharge pipe 1402 compensates for the fluid in the extraction pipe 21, and the compensation amount is L. A The pump starts and delivers fluid along the lower feed pipe 1401 to the lower discharge pipe 1402. The lower flow detector 19 detects that the fluid replenishment in the lower discharge pipe 1402 is L. A .

[0053] S3. When the plunger 1 sucks up material in the next unit time, it maintains flow compensation. The upper flow detector 18 detects the flow rate as L2 and determines whether L2 is equal to L1. If they are not equal, the pressure of the storage tank decreases. If they are equal, the feeding section 13 is blocked or leaks material.

[0054] S4. The driving component 22 controls the moving component 16 to move the cross pipe 20 upward so that the upper left port 20a is connected to the upper feed pipe 1301 and the lower right port 20d is connected to the lower discharge pipe 1402. The lower flow detector 19 detects the flow rate as L3 and determines whether L3 is equal to L0. If L3 is not equal to L0, it is determined that the upper feed pipe 1301 is blocked or leaking. If L3 is equal to L0, it is determined that the upper discharge pipe 1302 is blocked or leaking. When the plunger 1 moves downward along the metering chamber 12, part of the fluid in the extraction pipe 21 flows back into the upper discharge pipe 1302 to flush and clear the blockage.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A symmetrically distributed hollow shaft double eccentric adjustable mechanism, comprising a housing (10) and two sets of plungers (1) movably connected inside it, two sets of cylinders (17) symmetrically arranged below the housing (10), a metering chamber (12) is provided inside the cylinder (17), and a feeding section (13) and a discharging section (14) are connected to the outside of the cylinder (17) through a extraction pipe (21), wherein the feeding section (13) includes an upper feed pipe (1301) and an upper discharge pipe (1302), and the discharging section (14) includes a lower feed pipe (1401) and a lower discharge pipe (1402), characterized in that, Also includes: The pressure relief section (15) is located on the other side of the loading section (13) and the unloading section (14), and includes a fixed box (1501) with a storage cavity (1502) inside the fixed box (1501). The movable part (16) is movably connected inside the fixed box (1501) and is used to change the connection loop between the fixed box (1501) and the metering chamber (12). The movable part (16) has a cross pipe (20) inside.

2. The symmetrically distributed hollow shaft double-eccentric adjustable mechanism according to claim 1, characterized in that, The storage cavity (1502) is formed inside the fixed box (1501) and located above the moving part (16), and is used to form a communication loop with the feeding part (13).

3. The symmetrically distributed hollow shaft double-eccentric adjustable mechanism according to claim 1, characterized in that, One end of the upper feed pipe (1301) is connected to the storage tank and the other end is connected to the storage cavity (1502). One end of the upper discharge pipe (1302) is connected to the storage cavity (1502) and the other end is connected to the extraction pipe (21), which is used to deliver fluid into the metering cavity (12).

4. The symmetrically distributed hollow shaft double-eccentric adjustable mechanism according to claim 1, characterized in that, One end of the lower feed pipe (1401) is connected to the material preparation tank through the pump body, and one end of the lower discharge pipe (1402) is connected to the extraction pipe (21), which is used to drive the moving part (16) to move and change the connection loop of the metering chamber (12).

5. The symmetrically distributed hollow shaft double eccentric adjustable mechanism according to claim 1, characterized in that, The upper discharge pipe (1302) is equipped with an upper flow detector (18) for detecting the flow rate of the fluid discharged from the upper discharge pipe (1302) to the extraction pipe (21), and the lower discharge pipe (1402) is equipped with a lower flow detector (19) for detecting the flow rate of the fluid discharged from the lower discharge pipe (1402) to the extraction pipe (21).

6. The symmetrically distributed hollow shaft double-eccentric adjustable mechanism according to claim 5, characterized in that, The cross pipe (20) has an X-shaped structure, and the openings of the cross pipe (20) are the upper left opening (20a), the lower left opening (20b), the upper right opening (20c), and the lower right opening (20d). The upper left opening (20a) can be connected to the upper feed pipe (1301), the lower left opening (20b) can be connected to the lower feed pipe (1401), the upper right opening (20c) can be connected to the upper discharge pipe (1302), and the lower right opening (20d) can be connected to the lower discharge pipe (1402). The lower side of the moving part (16) is provided with a driving part (22) for controlling the up and down movement of the moving part (16).

7. A method of using a symmetrically distributed hollow shaft double-eccentric adjustable mechanism, the method utilizing the double-eccentric adjustable mechanism as described in claim 6, characterized in that, Includes the following steps: S1. When the upper flow detector (18) detects a decrease in the fluid flow rate within the upper discharge pipe (1302) per unit time, record L1 and calculate the flow rate difference L between L1 and the standard value L0. A ; S2. The moving part (16) moves the cross pipe (20) downward so that the lower left opening (20b) is connected to the lower feed pipe (1401) and the upper right opening (20c) is connected to the lower discharge pipe (1402). The lower discharge pipe (1402) compensates for the fluid in the extraction pipe (21) and the compensation amount is L. A ; S3, the plunger (1) maintains flow compensation when feeding material in the next unit time. The upper flow detector (18) detects the flow rate as L2 and determines whether L2 and L1 are equal. If they are not equal, the pressure of the storage tank decreases. If they are equal, the feeding part (13) is blocked or leaks material. S4. The drive unit (22) controls the moving unit (16) to move the cross pipe (20) upward so that the upper left opening (20a) is connected to the upper feed pipe (1301) and the lower right opening (20d) is connected to the lower discharge pipe (1402). The lower flow detector (19) detects the flow rate as L3 and determines whether L3 is equal to L0. If L3 is not equal to L0, it is determined that the upper feed pipe (1301) is blocked or leaking material. If L3 is equal to L0, it is determined that the upper discharge pipe (1302) is blocked or leaking material.

8. The method of using the symmetrically distributed hollow shaft double eccentric adjustable mechanism according to claim 7, characterized in that, S2 includes: the pump body starts and conveys fluid along the lower feed pipe (1401) to the lower discharge pipe (1402), and the lower flow detector (19) detects that the fluid replenishment in the lower discharge pipe (1402) is L. A .

9. The method of using the symmetrically distributed hollow shaft double eccentric adjustable mechanism according to claim 7, characterized in that, The S4 includes: when the plunger (1) moves downward along the metering chamber (12), a portion of the fluid in the extraction tube (21) flows back into the upper discharge tube (1302) to flush and clear the blockage.

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