Capillary tube anti-blocking self-cleaning type high-viscosity lubricating oil kinematic viscosity testing device

Abstract

The invention relates to the technical field of new material detection, and discloses a capillary tube anti-blocking self-cleaning type high-viscosity lubricating oil kinematic viscosity testing device. The device comprises a device body, a water bath cylinder and a viscometer arranged in the water bath cylinder, the viscometer is provided with a measuring tube, a capillary tube, a liquid storage ball and a buffer ball, the liquid storage ball and the buffer ball are connected, a pumping assembly is arranged at the bottom of the device body, a plunger pump is arranged at the top, and on-off of a pipeline is controlled through a valve assembly; a piston plate of the pumping assembly can be driven by a compression spring and a second telescopic air cylinder to achieve slow ascending sample injection and rapid descending energy storage release, so that high-speed turbulent flow is automatically formed in a capillary tube after measurement is finished, and thorough self-cleaning of a high-viscosity residual oil sample is achieved. The technical problem that the capillary tube is prone to being blocked is effectively solved, meanwhile, preheating of the spiral heat conduction tube and automatic timing of liquid level sensing are integrated, full-process automatic measurement is achieved, and the detection precision and efficiency are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new material detection, and particularly relates to a capillary anti-blocking self-cleaning high-viscosity lubricating oil kinematic viscosity testing device. BACKGROUND

[0002] Kinematic viscosity is a core index for measuring the rheological property of lubricating oil, and is crucial for new material research and development and industrial application. At present, a kinematic viscosity tester based on a glass capillary is generally used for measurement at home and abroad. Although this method is a standard method, it has obvious limitations in processing high-viscosity and easily-residual lubricating oil samples. After the completion of the test, the inner wall of the capillary is prone to adhere to high-viscosity oil samples. If the capillary is not thoroughly cleaned, the inner diameter of the capillary will change or even be blocked, which seriously affects the accuracy of subsequent measurement. The existing cleaning methods mostly rely on manual repeated flushing with organic solvents, which is not only tedious and inefficient, but also has problems such as incomplete cleaning, solvent pollution and health risks to personnel.

[0003] The automation improvement in the prior art is mostly focused on the automation of the measurement process, such as automatic sampling and timing, but it cannot effectively solve the fundamental problem of capillary blockage caused by high-viscosity lubricating oil. Although some devices have a simple reverse flushing function, the cleaning intensity is insufficient, and cannot generate turbulent flow strength sufficient to peel off stubborn residual oil samples. In addition, the sample preheating is not sufficient, which causes a temperature difference between the oil sample entering the measurement unit and the constant temperature bath, which is also an important factor that introduces measurement errors. Therefore, it is a technical bottleneck to be solved in the field to develop a high-viscosity lubricating oil kinematic viscosity testing device that can automatically and thoroughly clean the capillary and ensure uniformity of the sample temperature. SUMMARY

[0004] The technical problem to be solved by the present application is the shortcomings in the prior art. To this end, the present application provides a capillary anti-blocking self-cleaning high-viscosity lubricating oil kinematic viscosity testing device.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a capillary anti-blocking self-cleaning high-viscosity lubricating oil kinematic viscosity testing device, comprising a device main body and a water bath cylinder arranged in front of the device main body, a viscometer is arranged in the water bath cylinder, the viscometer comprises a measuring tube and vent pipes and air inlet pipes arranged on both sides of the measuring tube, the top end of the vent pipe is bent and communicates with the upper part inside the measuring tube, a one-way valve is arranged at the bent top end of the vent pipe, an upper liquid storage ball and a measuring ball are sequentially arranged below the measuring tube, a capillary tube is connected to the bottom of the measuring tube, a buffer ball is arranged at the bottom of the capillary tube, the bottom of the buffer ball communicates with the bottom of the vent pipe, a main liquid storage ball is arranged at the bottom of the air inlet pipe, the main liquid storage ball communicates with the buffer ball through a bent pipe, the bottom of the bent pipe is connected to an inlet and outlet liquid pipe, a plurality of spiral heat conduction pipes are uniformly distributed below the inlet and outlet liquid pipe, a plunger pump is movably arranged at the top of the front of the device main body, and the plunger pump is used to generate negative pressure in the measuring tube.

[0006] A pumping assembly is located at the front bottom of the main body of the device. The pumping assembly includes a housing, inside which a piston plate is movably mounted. A second telescopic cylinder is connected to the bottom of the housing. The second telescopic cylinder is used to control the movement of the piston plate within the housing. The piston plate divides the interior of the housing into upper and lower spaces. The upper space inside the housing is a liquid storage chamber, which is connected to a spiral heat-conducting pipe via a connecting pipe. A valve assembly is also installed on the vent pipe and the air inlet pipe. A connecting pipe is provided between the valve assembly and the housing. One end of the connecting pipe is connected to the lower space inside the housing. This is used to generate positive pressure when the piston plate descends, causing the valve assembly to close the vent pipe and the air inlet pipe, thereby creating negative pressure inside the measuring tube to draw in the capillary.

[0007] Preferably, the water bath is equipped with a first liquid level sensor timer and a second liquid level sensor timer. The first liquid level sensor timer corresponds to the middle position between the upper liquid storage ball and the measuring ball, and the second liquid level sensor timer corresponds to the position below the measuring ball.

[0008] Preferably, a first telescopic cylinder is installed at the top front of the main body of the device. The output end of the first telescopic cylinder is fixedly connected to the plunger pump. The first telescopic cylinder is used to control the docking of the plunger pump with the top of the measuring tube. The one-way closing valve is configured such that when the plunger pump draws suction from the measuring tube, a negative pressure is generated inside the measuring tube, and the one-way closing valve is in a closed state. When the measuring tube is under normal pressure, the one-way closing valve is in a connected state.

[0009] Preferably, the valve assembly includes a housing mounted on the vent pipe and the intake pipe. The housing has a vertically penetrating channel inside and a slide groove inside. A slider is slidably connected in the slide groove. A valve plate is installed on the side of the slider near the channel, extending into the channel to change the internal communication state of the vent pipe and the intake pipe. A return spring is fixedly installed between the other side of the slider and the inner wall of the slide groove. An air inlet is provided on the side of the housing away from the channel, communicating with the inside of the slide groove. The return spring is configured such that it is in a compressed state under normal pressure inside the air inlet.

[0010] Preferably, the pumping assembly further includes a compression spring fixedly installed between the bottom of the piston plate and the inner wall of the housing, and a connecting block is provided at the bottom of the piston plate, with a transverse movable groove and a longitudinal movable groove inside the connecting block.

[0011] Preferably, both sides of the transverse movable groove are slidably connected to an extrusion block, and a small spring is installed between the extrusion block and the inner wall of the transverse movable groove. The interior of the longitudinal movable groove is slidably connected to a limit block, and a movable rod is installed at the bottom of the limit block. The other end of the movable rod passes through the bottom of the housing and is fixedly connected to the second telescopic cylinder.

[0012] Preferably, the cross-sectional shape of the extrusion block is a right trapezoid with opposite faces inclined and the upper part smaller than the lower part, and the cross-section of the limiting block is an isosceles trapezoid with the upper part larger than the lower part.

[0013] Preferably, the bottom inner wall of the shell is fixedly provided with a connecting rod, and the end of the connecting rod is fixedly connected with a guide column, and the top and bottom of the extrusion block are provided with extrusion grooves.

[0014] Preferably, the lower two sides of the inside of the shell are provided with exhaust holes in communication with the outside, so as to avoid that the piston plate in the shell cannot move.

[0015] Preferably, the outside of the shell is connected with a liquid discharge pipe and a liquid inlet pipe, and the liquid discharge pipe and the liquid inlet pipe are respectively provided with on-off valves.

[0016] The technical effects and advantages of the present application are as follows:

[0017] In the present application, the pumping assembly and the valve assembly work simultaneously, and after the measurement is completed, the anti-blocking and self-cleaning process is automatically triggered. The compressed spring is used to store energy and release driving force to generate a transient strong suction force, and the valve is automatically closed in the capillary tube to form a high-speed turbulent flow, so that the residual high-viscosity oil sample is completely removed, and the problem of capillary tube blockage is fundamentally solved. At the same time, the whole process automation from sampling, constant temperature, measurement to cleaning is realized, and the pre-heating function of the spiral heat conduction pipe effectively eliminates the measurement error caused by temperature difference, thereby ensuring the testing accuracy of high-viscosity samples and greatly improving the detection efficiency and equipment maintenance convenience. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosed content of the present application will be explained with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference signs are used to refer to the same parts:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a schematic diagram of the partial structure of the present application;

[0021] Figure 3 It is a front view of the viscometer and the pumping assembly structure of the present application;

[0022] Figure 4 It is a sectional view of the viscometer of the present application;

[0023] Figure 5 It is a schematic diagram of the partial structure of the viscometer, the valve assembly and the pumping assembly of the present application;

[0024] Figure 6 It is a sectional view of the valve assembly structure of the present application;

[0025] Figure 7 Figure 6 is a structural sectional view of the pumping assembly of the present application;

[0026] Figure 8 Figure 7 is a structural schematic view of the extrusion block, limit block and guide column of the present application.

[0027] Figure 1 is a schematic view of the device body; Figure 2 is a schematic view of the water bath cylinder; Figure 3 is a schematic view of the measuring tube; Figure 4 is a schematic view of the vent pipe; Figure 5 is a schematic view of the air inlet pipe; Figure 6 is a schematic view of the upper liquid storage ball; Figure 7 is a schematic view of the measuring ball; Figure 8 is a schematic view of the capillary tube; Figure 9 is a schematic view of the buffer ball; Figure 10 is a schematic view of the main liquid storage ball; Figure 11 is a schematic view of the elbow pipe; Figure 12 is a schematic view of the inlet and outlet liquid pipe; Figure 13 is a schematic view of the spiral heat conduction pipe; Figure 14 is a schematic view of the one-way closing valve; Figure 15 is a schematic view of the shell; Figure 16 is a schematic view of the channel; Figure 17 is a schematic view of the valve plate; Figure 18 is a schematic view of the sliding groove; Figure 19 is a schematic view of the sliding block; Figure 20 is a schematic view of the return spring; Figure 21 is a schematic view of the air inlet port; Figure 22 is a schematic view of the first liquid level sensing timer; Figure 23 is a schematic view of the second liquid level sensing timer; Figure 24 is a schematic view of the plunger pump; Figure 25 is a schematic view of the first telescopic air cylinder; Figure 26 is a schematic view of the connecting pipe; Figure 27 is a schematic view of the housing; Figure 28 is a schematic view of the piston plate; Figure 29 is a schematic view of the liquid storage cavity; Figure 30 is a schematic view of the compression spring; Figure 31 is a schematic view of the air vent hole; Figure 32 is a schematic view of the connecting block; Figure 33 is a schematic view of the transverse movable slot; Figure 34 is a schematic view of the longitudinal movable slot; Figure 35 is a schematic view of the small spring; Figure 36 is a schematic view of the extrusion block; Figure 37 is a schematic view of the extrusion slot; Figure 38 is a schematic view of the limit block; Figure 39 is a schematic view of the movable rod; Figure 40 is a schematic view of the connecting rod; Figure 41 is a schematic view of the guide column; Figure 42 is a schematic view of the second telescopic air cylinder; Figure 43 is a schematic view of the communication pipe; Figure 44 is a schematic view of the liquid discharge pipe; and Figure 45 is a schematic view of the liquid inlet pipe. DETAILED DESCRIPTION

[0028] It is easy to understand that, according to the technical scheme of the present application, those skilled in the art can propose various structural modes and implementation modes that can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and the accompanying drawings are only exemplary descriptions of the technical scheme of the present application, and should not be regarded as the whole or as a limitation or restriction of the technical scheme of the present application.

[0029] Please refer to Figures 1 to 8 The present application provides a capillary tube anti-blocking self-cleaning high-viscosity lubricating oil kinematic viscosity testing device; the device comprises a device body 1 and a water bath cylinder 2 arranged in front of the device body 1; a viscometer is arranged inside the water bath cylinder 2, and the water bath cylinder 2 is used to provide a constant temperature environment to ensure the accuracy of viscosity measurement.

[0030] The viscometer comprises a measuring tube 3 and a vent pipe 4 and an air inlet pipe 5 arranged on both sides of the measuring tube 3; the measuring tube 3 is used to carry the liquid to be measured and perform viscosity measurement; the top end of the vent pipe 4 is bent and communicates with the upper part inside the measuring tube 3, and a one-way valve 14 is arranged at the bent top end of the vent pipe 4; the one-way valve 14 is configured as follows: when the plunger pump 24 performs suction on the measuring tube 3, negative pressure is generated inside the measuring tube 3, and the one-way valve 14 is in a closed state, so that the negative pressure inside the measuring tube 3 can effectively act on the liquid; when the inside of the measuring tube 3 is in a normal pressure state, the one-way valve 14 is in a communication state, allowing air to flow, which facilitates the oil in the buffer ball 9 to drop.

[0031] The lower part of the measuring tube 3 is sequentially provided with an upper liquid storage ball 6 and a measuring ball 7; the upper liquid storage ball 6 and the measuring ball 7 are components for storing and measuring the volume of liquid in the viscometer; the bottom of the measuring tube 3 is connected with a capillary tube 8, which is used to generate fluid resistance and conduct viscosity measurement; the bottom of the capillary tube 8 is provided with a buffer ball 9, which is used to buffer the flow of liquid and is in communication with the bottom of the vent tube 4; the bottom of the air inlet tube 5 is provided with a main liquid storage ball 10, which is used to store the liquid to be measured; the bottom of the main liquid storage ball 10 is in communication with the bottom of the buffer ball 9 through an elbow pipe 11, and the bottom of the elbow pipe 11 is connected with an inlet and outlet liquid pipe 12; the inlet and outlet liquid pipe 12 is a channel for liquid to enter and exit the viscometer; the lower part of the inlet and outlet liquid pipe 12 is uniformly distributed with spiral heat conduction pipes 13, which are used to preheat the liquid before it enters the viscometer, so as to reduce the viscosity of high-viscosity lubricating oil and facilitate measurement; the spiral heat conduction pipes 13 can efficiently transfer the heat in the water bath cylinder 2 to the liquid flowing therethrough through their large surface area, achieving uniform and rapid preheating.

[0032] The front top of the equipment body 1 is movably provided with a plunger pump 24, which is used to generate negative pressure in the measuring tube 3, so as to suck the liquid to be measured into the measuring tube 3 for measurement; in order to realize the precise docking of the plunger pump 24 and the measuring tube 3, the front top of the equipment body 1 is provided with a first telescopic air cylinder 25, the output end of which is fixedly connected with the plunger pump 24, and the first telescopic air cylinder 25 is used to control the docking of the plunger pump 24 and the top of the measuring tube 3.

[0033] The front bottom of the equipment body 1 is provided with a pumping assembly, which is used to pump the liquid to be measured into the viscometer and realize the cleaning function; the pumping assembly comprises a shell 27, and a piston plate 28 is movably arranged in the shell 27; the bottom of the shell 27 is connected with a second telescopic air cylinder 42, which is used to control the movement of the piston plate 28 in the shell 27; the piston plate 28 divides the inside of the shell 27 into an upper space and a lower space; the upper space in the shell 27 is a liquid storage cavity 29, which is used to store the liquid to be measured; the liquid storage cavity 29 is in communication with the spiral heat conduction pipes 13 through a connecting pipe 26, forming a liquid conveying passage.

[0034] Valve assemblies are also arranged on the vent tube 4 and the air inlet tube 5; a communication pipe 43 is arranged between the valve assemblies and the shell 27, one end of the bottom of the communication pipe 43 being in communication with the lower space in the inside of the shell 27; the communication pipe 43 is used to transmit the positive pressure generated in the lower space in the inside of the shell 27 to the valve assemblies when the piston plate 28 descends, so as to promote the valve assemblies to close the vent tube 4 and the air inlet tube 5, and then generate negative pressure in the inside of the measuring tube 3 to suck the capillary tube 8, realizing the self-cleaning function.

[0035] In a preferred embodiment, the inside of the water bath cylinder 2 is provided with a first liquid level sensing timer 22 and a second liquid level sensing timer 23; the first liquid level sensing timer 22 corresponds to the position of the upper liquid storage ball 6 and the middle position of the measuring ball 7, and the second liquid level sensing timer 23 corresponds to the position below the measuring ball 7; the two liquid level sensing timers are used to accurately detect the time when the liquid passes through a specific position, so as to automatically calculate the kinematic viscosity value, thereby improving the automation and accuracy of the measurement.

[0036] In a preferred embodiment, referring to Figure 6 , the valve assembly comprises a shell 15 mounted on the vent pipe 4 and the air inlet pipe 5, and a through channel 16 is arranged in the shell 15; a sliding groove 18 is further arranged in the shell 15, and a sliding block 19 is slidably connected in the sliding groove 18; the sliding block 19 is provided with a valve plate 17 on the side close to the channel 16, and the valve plate 17 extends into the channel 16 and is used to change the connection state of the inside of the vent pipe 4 and the air inlet pipe 5; a return spring 20 is fixedly arranged between the other side of the sliding block 19 and the inner wall of the sliding groove 18; a gas connection port 21 is arranged on the side of the shell 15 away from the channel 16, and the gas connection port 21 is in communication with the inside of the sliding groove 18; the return spring 20 is configured such that under the normal pressure in the gas connection port 21, the return spring 20 is in a compressed state, so that the valve plate 17 does not hinder the communication of the channel 16; when the gas connection port 21 receives a positive pressure from the communication pipe 43, the positive pressure overcomes the elastic force of the return spring 20, pushes the sliding block 19 and the valve plate 17 to move, thereby closing the channel 16 and realizing the closure of the vent pipe 4 and the air inlet pipe 5.

[0037] Example two

[0038] Please refer to Figure 7 and Figure 8 , this embodiment further describes the structure and working principle of the pumping assembly based on the embodiment one.

[0039] The pumping assembly further comprises a compression spring 30 fixedly arranged between the bottom of the piston plate 28 and the inner wall of the shell 27; the compression spring 30 is compressed when the piston plate 28 descends, and releases energy under certain conditions to drive the piston plate 28 to rebound quickly, thereby generating a strong suction force; the bottom of the piston plate 28 is further provided with a connecting block 32, and the inside of the connecting block 32 is provided with a transverse movable groove 33 and a longitudinal movable groove 34.

[0040] The inside of the transverse movable groove 33 is slidably connected with a pressing block 36 on both sides, and a small spring 35 is arranged between the pressing block 36 and the inner wall of the transverse movable groove 33; the small spring 35 is used to push the pressing block 36 inward; the inside of the longitudinal movable groove 34 is slidably connected with a limiting block 38, and the bottom of the limiting block 38 is provided with a movable rod 39, and the other end of the movable rod 39 penetrates through the bottom of the shell 27 and is fixedly connected with the second telescopic air cylinder 42.

[0041] The cross-sectional shape of the extrusion block 36 is a right trapezoid with the opposite faces inclined and the upper part smaller than the lower part, and the cross-sectional shape of the limiting block 38 is an isosceles trapezoid with the upper part larger than the lower part; so that when the limiting block 38 is reset by moving downward, it can push the extrusion block 36 outward through the inclined face, and return to the lower part of the extrusion block 36.

[0042] The bottom inner wall of the shell 27 is fixedly installed with a connecting rod 40, and the end of the connecting rod 40 is fixedly connected with a guide column 41; the top and bottom of the extrusion block 36 are provided with extrusion grooves 37; in the normal state, the upper part of the limiting block 38 is in contact with the lower part of the two groups of extrusion blocks 36, at this time the extrusion blocks 36 are pushed upward by the limiting block 38, so as to push the piston plate 28.

[0043] Working principle:

[0044] Phase one: slow sampling and synchronous heating: in the initial state, the second telescopic cylinder 42 starts to work, and its output end pushes the limiting block 38 upward through the movable rod 39; the upper part of the limiting block 38 is in contact with the lower part of the extrusion block 36, and due to the special trapezoidal structure of the limiting block 38 and the extrusion block 36, the limiting block 38 will push the extrusion block 36 in the rising process, so that the connecting block 32 and the piston plate 28 slowly move upward; the slow upward movement of the piston plate 28 stably pushes the lubricating oil in the liquid storage cavity 29 into the spiral heat conducting pipe 13 through the connecting pipe 26; when the lubricating oil flows through the spiral heat conducting pipe 13, it can efficiently absorb heat from the water bath cylinder 2 due to the huge surface area of the spiral heat conducting pipe 13, so as to realize uniform and rapid preheating, reduce the viscosity, and facilitate subsequent measurement; the preheated lubricating oil enters the bottom of the viscometer through the inlet and outlet pipe 12, and slowly fills the main liquid storage ball 10 and other parts.

[0045] Phase two: constant temperature measurement and automatic timing: when the sample is filled, the first telescopic cylinder 25 works to press down the plunger pump 24 and seal the top end of the measuring tube 3; then, the plunger pump 24 works to generate negative pressure in the measuring tube 3; at this time, the one-way valve 14 at the top end of the vent pipe 4 is automatically closed due to the negative pressure, so as to ensure the negative pressure environment in the measuring tube 3; under the action of negative pressure, the oil sample at the bottom of the viscometer is sucked up, mainly flowing upward through the capillary tube 8, entering the measuring ball 7 and the upper liquid storage ball 6 in turn, and then the first telescopic cylinder 25 drives the plunger pump 24 to reset, the one-way valve is opened, the oil sample below the capillary tube 8 is vented, the oil sample in the measuring tube 3 flows under the action of gravity, and the test formally starts; when the oil sample liquid surface passes through the first liquid level sensing timer 22 and the second liquid level sensing timer 23, the system automatically records the flow time, and calculates the kinematic viscosity value according to the preset formula.

[0046] Stage three: after the measurement is completed, the system automatically enters the cleaning mode; the second telescopic cylinder 42 continues to extend, further pushing the movable rod 39 and the limiting block 38 to move upwards; when the limiting block 38 pushes the extrusion block 36 to the bottom, the guide column 41 passes through the guide effect of the extrusion groove 37, so that the two groups of extrusion blocks 36 overcome the elastic force of the small spring 35 and are away from each other, thereby being separated from the limiting block 38 and releasing the locking of the piston plate 28; the compressed compression spring 30 rapidly releases the energy, pulls the piston plate 28 to quickly descend, at the same time, the air below the piston plate 28 is compressed, the generated positive pressure gas is pressed into the air inlet 21 of the valve assembly, the positive pressure overcomes the elastic force of the return spring 20, pushes the sliding block 19 and the valve plate 17 to move, so that the valve plate 17 moves to the middle of the channel 16, thereby simultaneously closing the vent pipe 4 and the air inlet pipe 5; at this time, a closed system is formed in the entire viscometer; the rapid descent of the piston plate 28 generates a strong suction force in the liquid storage cavity 29; this strong negative pressure is transmitted to the bottom of the viscometer through the connecting pipe 26, the spiral heat conducting pipe 13 and the liquid inlet and outlet pipe 12, rapidly extracts the waste liquid in the viscometer, and forms a high-speed turbulent flow in the capillary tube 8, which can effectively flush away the residual oil sample on the pipe wall, realize rapid and thorough cleaning of the capillary tube 8, and effectively prevent blockage. In this process, cleaning liquid can be injected from the top of the measuring pipe 3, and the strong negative pressure suction process is matched to realize thorough cleaning of the entire pipeline and the capillary tube.

[0047] In a preferred embodiment, the lower two sides of the inside of the shell 27 are provided with exhaust holes 31 communicating with the outside, so as to avoid that the piston plate 28 in the shell 27 cannot move, ensure that the air pressure under the piston plate 28 can be discharged in time when the piston plate 28 moves, and at the same time ensure that the inside is still in a positive pressure state, so as to ensure smooth movement of the piston plate 28 and closure of the valve assembly.

[0048] In a preferred embodiment, the outside of the shell 27 is connected with a liquid discharge pipe 44 and a liquid inlet pipe 45, and the liquid discharge pipe 44 and the liquid inlet pipe 45 are respectively provided with on-off valves; the liquid discharge pipe 44 is used for discharging waste liquid or cleaning liquid in the liquid storage cavity 29, and the liquid inlet pipe 45 is used for supplementing new sample or cleaning liquid to be measured, and the on-off valves can conveniently control the inlet and outlet of the liquid.

[0049] The technical scope of the present application is not limited to the content in the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should all belong to the protection scope of the present application.

Claims

1. A capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device, characterized in that, The device includes a main body and a water bath located in front of the main body. A viscometer is installed inside the water bath. The viscometer includes a measuring tube and venting and inlet pipes on both sides of the measuring tube. The top of the venting pipe is bent and communicates with the upper part of the measuring tube. A one-way valve is installed at the bend in the top of the venting pipe. An upper liquid storage ball and a measuring ball are sequentially arranged below the measuring tube. A capillary tube is connected to the bottom of the measuring tube, and a buffer ball is located at the bottom of the capillary tube. The bottom of the venting pipe communicates with the buffer ball. A main liquid storage ball is located at the bottom of the inlet pipe. The bottom of the main liquid storage ball and the bottom of the buffer ball are connected by a bend pipe. An inlet and outlet pipe are connected to the bottom of the bend pipe. Spiral heat-conducting pipes are evenly distributed below the inlet and outlet pipes. A plunger pump is movably installed at the top front of the main body of the device. The plunger pump is used to generate negative pressure inside the measuring tube. A pumping assembly is located at the front bottom of the main body of the device. The pumping assembly includes a housing, inside which a piston plate is movably mounted. A second telescopic cylinder is connected to the bottom of the housing. The second telescopic cylinder is used to control the movement of the piston plate within the housing. The piston plate divides the interior of the housing into upper and lower spaces. The upper space inside the housing is a liquid storage chamber, which is connected to a spiral heat-conducting pipe via a connecting pipe. A valve assembly is also installed on the vent pipe and the air inlet pipe. A connecting pipe is provided between the valve assembly and the housing. One end of the connecting pipe is connected to the lower space inside the housing. This is used to generate positive pressure when the piston plate descends, causing the valve assembly to close the vent pipe and the air inlet pipe, thereby creating negative pressure inside the measuring tube to draw in the capillary.

2. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 1, characterized in that: The water bath is equipped with a first liquid level sensor timer and a second liquid level sensor timer. The first liquid level sensor timer corresponds to the middle position between the upper liquid storage ball and the measuring ball, and the second liquid level sensor timer corresponds to the position below the measuring ball.

3. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 1, characterized in that: A first telescopic cylinder is installed at the top front of the main body of the device. The output end of the first telescopic cylinder is fixedly connected to the plunger pump. The first telescopic cylinder is used to control the plunger pump to dock with the top of the measuring tube. The one-way closing valve is configured such that when the plunger pump draws suction from the measuring tube, a negative pressure is generated inside the measuring tube, and the one-way closing valve is in a closed state. When the measuring tube is under normal pressure, the one-way closing valve is in a connected state.

4. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 1, characterized in that: The valve assembly includes a housing mounted on the vent pipe and the intake pipe. The housing has a vertically penetrating channel inside and a slide groove inside. A slider is slidably connected in the slide groove. A valve plate is installed on the side of the slider near the channel, extending into the channel to change the internal communication state of the vent pipe and the intake pipe. A return spring is fixedly installed between the other side of the slider and the inner wall of the slide groove. An air inlet is provided on the side of the housing away from the channel, communicating with the inside of the slide groove. The return spring is configured such that it is in a compressed state under normal pressure inside the air inlet.

5. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 4, characterized in that: The pumping assembly also includes a compression spring fixedly installed between the bottom of the piston plate and the inner wall of the housing. The bottom of the piston plate is also provided with a connecting block, and the interior of the connecting block is provided with a transverse movable groove and a longitudinal movable groove.

6. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 5, characterized in that: Both sides of the transverse movable groove are slidably connected to the extrusion blocks, and small springs are installed between the extrusion blocks and the inner wall of the transverse movable groove. The interior of the longitudinal movable groove is slidably connected to the limit block, and a movable rod is installed at the bottom of the limit block. The other end of the movable rod passes through the bottom of the housing and is fixedly connected to the second telescopic cylinder.

7. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 6, characterized in that: The cross-sectional shape of the extrusion block is a right trapezoid with opposite inclined surfaces and a smaller top and larger bottom, while the cross-section of the limiting block is an isosceles trapezoid with a larger top and smaller bottom.

8. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 7, characterized in that: A connecting rod is fixedly installed on the bottom inner wall of the housing, and a guide post is fixedly connected to the end of the connecting rod. Extrusion grooves are provided at the top and bottom of the extrusion block.

9. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 8, characterized in that: The lower sides of the interior of the housing are provided with exhaust vents that communicate with the outside, thus preventing the piston plate inside the housing from being unable to move.

10. The capillary anti-clogging self-cleaning high-viscosity lubricating oil kinematic viscosity testing device according to claim 9, characterized in that: The outer side of the housing is connected to a drain pipe and a liquid inlet pipe, and each of the drain pipe and the liquid inlet pipe is equipped with a switch valve.

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