Liquid viscosity coefficient measuring device based on stepping motor control

Abstract

The utility model discloses a liquid viscosity coefficient measuring device based on stepping motor control, and relates to the technical field of liquid viscosity coefficient measuring devices. The water tank comprises a water tank body, a sliding rail assembly, a connecting plate and a light sliding block, the sliding rail assembly is fixed to the top of the water tank body and comprises supporting plates and an air cushion guide rail, the supporting plates are fixed to the two short edges of the top of the water tank body, the air cushion guide rail is fixed between the two supporting plates, and fixing blocks are fixed to the middles of the tops of the two supporting plates. A connecting plate is jointly fixed to the tops of the two fixing blocks, a stepping motor is fixed to one side of one fixing block, and a light sliding block is movably connected to the outer side of the air cushion guide rail. Through the arrangement of the water tank, the sliding rail assembly, the connecting plate and the light sliding block, the problems that errors are large in the measurement process in the work of detecting the viscosity coefficient of liquid through a traditional falling ball method, and errors are prone to being generated in different initial liquid levels in the measurement process are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid viscosity coefficient measuring devices, and particularly relates to a liquid viscosity coefficient measuring device based on stepping motor control. Background Technique

[0002] The liquid viscosity coefficient is an important physical quantity describing the nature of internal friction in liquids, also known as the internal friction coefficient or viscosity. The liquid viscosity coefficient refers to the internal friction force per unit area along the flow layer when there is a unit velocity gradient between two laminar flow layers. It characterizes the ability of the liquid to resist deformation and only manifests when there is relative motion in the liquid. In the falling ball method detection, the viscosity coefficient is calculated by measuring the falling speed of the small ball in the liquid. When the small ball falls uniformly in the liquid, its gravity, buoyancy, and viscous resistance reach equilibrium. According to Stokes' formula (η = 2gr²(ρ s - ρ l ) / 9v), the viscosity coefficient can be calculated, but it still has the following drawbacks in actual use:

[0003] In the traditional falling ball method for detecting the viscosity coefficient of liquids, it is necessary for experimenters to observe with the naked eye to determine when the small ball reaches a uniform speed during its movement in the liquid to be measured. Moreover, during the work, the small ball is also affected by the gravitational acceleration, resulting in a large measurement error.

[0004] Secondly, during the measurement, the small ball is often placed at different positions in the liquid. In the detection work, when the small ball starts the measurement at different initial liquid levels, the measured data has a certain error, affecting the measurement accuracy. Content of the Utility Model

[0005] The purpose of the utility model is to provide a liquid viscosity coefficient measuring device based on stepping motor control. By setting a water tank, a slide rail assembly, a connecting plate, and a light slider, the problems of large measurement errors in the traditional falling ball method for detecting the viscosity coefficient of liquids and the easy generation of errors when the small ball is at different initial liquid levels during the measurement are solved.

[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] The utility model relates to a device for measuring the viscosity coefficient of a liquid based on stepping motor control, which comprises a water tank, a slide rail assembly, a connecting plate and a light slider. A slide rail assembly is fixed on the top of the water tank. The slide rail assembly comprises a support plate and an air cushion guide rail. Support plates are fixed at two short sides of the top of the water tank. An air cushion guide rail is fixedly arranged between the two support plates. Fixed blocks are fixed in the middle of the tops of the two support plates. A connecting plate is fixedly arranged on the tops of the two fixed blocks. A stepping motor is fixed on one side of one of the fixed blocks. The outer side of the air cushion guide rail is movably connected with a light slider. A sliding port is formed through the light slider, and the air cushion guide rail penetrates through the sliding port. A fixed rod is fixed at the center of the bottom of the light slider, and a small ball is fixed at the bottom end of the fixed rod. During operation, the water tank is used to contain the liquid whose viscosity coefficient needs to be measured, and the slide rail assembly provides a supporting effect for the light slider above the water tank. The force sensor driven by the structure driven by the stepping motor on the connecting plate drives the light slider to move on the air cushion guide rail under the pulling of the connecting rope, and drives the small ball to slide in the liquid to be measured in the water tank.

[0008] Further, a water outlet pipe is fixedly communicated with the upper part of one end of the water tank, and a switch valve is fixed on the periphery of the water outlet pipe. The water outlet pipe ensures that the liquid levels are the same when measuring the viscosity coefficient of the liquid to be measured in the water tank, and the on-off of the water outlet pipe is controlled by the switch valve.

[0009] Further, the slide rail assembly further comprises a connecting frame. A connecting frame is fixed on one side of the support plate close to the air cushion guide rail near the stepping motor. The connecting frame is arranged above the air cushion guide rail. During the operation of the slide rail assembly, a fixed pulley is rotatably connected in the connecting frame.

[0010] Further, the slide rail assembly further comprises a fixed pulley and a connecting rope. A fixed pulley is rotatably connected in the connecting frame. A connecting rope is wound around the periphery of the fixed pulley. The lower end of the connecting rope is fixed to the light slider. The fixed pulley changes the pulling direction of the connecting rope.

[0011] Further, a threaded rod is fixed at the output end of the stepping motor. The threaded rod passes through the fixed block fixed to the stepping motor, and the end of the threaded rod away from the stepping motor is rotatably connected to the fixed block away from the stepping motor. During the rotation of the threaded rod driven by the stepping motor, the sliding plate is driven to move.

[0012] Further, a sliding plate is threadedly connected to the periphery of the threaded rod. The top of the sliding plate is in contact with the connecting plate. A force sensor is fixed at the short side of the bottom of the sliding plate close to the stepping motor. The upper end of the connecting rope is fixed to one end of the force sensor close to the stepping motor. During the operation of the threaded rod, the force sensor is driven to move through the sliding plate, and the connecting rope is pulled to drive the light slider to move.

[0013] The utility model has the following beneficial effects:

[0014] By setting a water tank, a slide rail assembly, a connecting plate and a lightweight slider, the utility model solves the problem of large measurement errors in the traditional falling ball method for detecting the viscosity coefficient of a liquid. When measuring the viscosity coefficient of the fluid to be measured, start the air cushion guide rail. First, without pouring any liquid into the water tank, directly start the stepping motor to drive the threaded rod to rotate, drive the sliding plate to slide at the bottom of the connecting plate, and at the same time drive the force sensor. After the movement direction of the connecting rope connected to the force sensor is changed by the fixed pulley, it pulls the lightweight slider to slide on the air cushion guide rail, driving the sliding port, the fixed rod and the small ball at the bottom of the lightweight slider to slide in the air or the fluid to be measured. After the measured vertical value is calculated, the viscosity coefficient of the fluid to be measured is obtained. In the measurement, the stepping motor can accurately control the pulse signal to achieve precise control of the movement speed and displacement of the small ball, ensure the uniform movement of the small ball, effectively avoid errors caused by unstable speed, and have higher measurement accuracy.

[0015] By setting a water tank, the utility model solves the problem of easy errors in the measurement when the small ball is at different initial liquid levels. When measuring the viscosity coefficient of the corresponding liquid, pour the liquid to be measured into the water tank and make it higher than the height of the water outlet pipe, and set the container for receiving the excess liquid below the water outlet pipe. Open the switch valve on the water outlet pipe, and the excess liquid in the water tank will drain into the collecting container from the water outlet pipe until no more liquid drains from the water outlet pipe, then close the switch valve. Ensure that when measuring different liquids, the liquid level in the water tank is the same and the liquid just submerges the small ball, ensuring that the small ball is at the same depth in the measurement of the viscosity coefficient of different liquids and reducing errors. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a three-dimensional assembly structure diagram of a liquid viscosity coefficient measuring device based on stepping motor control;

[0018] Figure 2 It is a three-dimensional structure diagram of the water tank;

[0019] Figure 3 It is a three-dimensional structure diagram of the slide rail assembly;

[0020] Figure 4 It is a three-dimensional structure diagram of the connecting plate;

[0021] Figure 5It is a three-dimensional view of a lightweight slider structure.

[0022] Reference numerals:

[0023] 1. Water tank; 101. Water outlet pipe; 102. On-off valve; 2. Slide rail assembly; 201. Support plate; 202. Air cushion rail; 203. Connection frame; 204. Fixed pulley; 205. Connection rope; 3. Connection plate; 301. Fixed block; 302. Stepping motor; 303. Threaded rod; 304. Slide plate; 305. Force sensor; 4. Lightweight slider; 401. Slide port; 402. Fixed rod; 403. Small ball. Specific implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Specific embodiment 1

[0025] Please refer to Figure 1-2, the utility model is a device for measuring the viscosity coefficient of liquid based on stepper motor control, which includes a water tank 1, a slide rail assembly 2, a connecting plate 3 and a light slider 4. The slide rail assembly 2 is fixed on the top of the water tank 1. The water tank 1 contains the liquid whose viscosity coefficient needs to be measured. The slide rail assembly 2 supports the light slider 4 on it. The slide rail assembly 2 includes a support plate 201 and an air cushion guide rail 202. Support plates 201 are fixed at both short sides of the top of the water tank 1. An air cushion guide rail 202 is fixedly connected between the two support plates 201. The support plate 201 fixedly supports a fixed block 301 on it. The air cushion guide rail 202 is fixed between the two support plates 201 and movably connects the light slider 4 on the air cushion guide rail 202. Fixed blocks 301 are fixed in the middle of the tops of the two support plates 201. The fixed block 301 fixedly supports the connecting plate 3 on the support plate 201. The connecting plate 3 restricts the position of the sliding plate 304. A stepper motor 302 is fixed on one side of a fixed block 301. The stepper motor 302 drives the threaded rod 303 to rotate. The light slider 4 is movably connected to the outside of the air cushion guide rail 202. During the sliding of the light slider 4, the fixed rod 402 is driven to move. A sliding opening 401 is formed through the light slider 4. The air cushion guide rail 202 passes through the sliding opening 401. The light slider 4 is movably arranged on the air cushion guide rail 202 through the sliding opening 401. A fixed rod 402 is fixed at the center of the bottom of the light slider 4. A small ball 403 is fixed at the bottom end of the fixed rod 402. The fixed rod 402 at the bottom of the light slider 4 connects the small ball 403 below it, and the small ball 403 is immersed in the liquid in the water tank 1 whose viscosity coefficient needs to be measured during operation.

[0026] Specifically, a water outlet pipe 101 is fixedly connected to the upper part of one end of the water tank 1. A switch valve 102 is fixed on the circumference of the water outlet pipe 101. During operation, the water tank 1 is supported on the workbench surface, and a container for collecting the excess liquid to be measured is supported on the workbench surface below the output end of the water outlet pipe 101. The switch valve 102 on the circumference of the water outlet pipe 101 controls the on-off of the water outlet pipe 101.

[0027] Furthermore, the slide rail assembly 2 further includes a connecting frame 203. A connecting frame 203 is fixed on the side of the support plate 201 close to the air cushion guide rail 202 near the stepper motor 302. The connecting frame 203 is arranged above the air cushion guide rail 202, and a fixed pulley 204 is rotatably connected through the connecting frame 203.

[0028] The operation process of this embodiment is as follows: During work, when it is necessary to measure the viscosity coefficient of the corresponding liquid, pour the liquid to be measured into the water tank 1, and the liquid level should be higher than the height of the water outlet pipe 101. Place the container for receiving the excess liquid below the water outlet pipe 101. Open the switch valve 102 on the water outlet pipe 101, and the excess liquid in the water tank 1 will drain from the water outlet pipe 101 into the collecting container. After the liquid no longer drains from the water outlet pipe 101, close the switch valve 102 to ensure that the liquid level in the water tank 1 is the same when measuring different liquids, and the liquid just submerges the small ball 403. Specific Embodiment Two

[0029] Please refer to Figure 1-5 , on the basis of Specific Embodiment One, the slide rail assembly 2 further includes a fixed pulley 204 and a connecting rope 205. A fixed pulley 204 is rotatably connected inside the connecting frame 203. A connecting rope 205 is wound around the circumference of the fixed pulley 204. The lower end of the connecting rope 205 is fixed to the lightweight slider 4. The fixed pulley 204 movably connects the connecting rope 205 thereon, changes the movement direction of the connecting rope 205, and connects the lightweight slider 4 and the force sensor 305 together through the connecting rope 205.

[0030] Specifically, the output end of the stepping motor 302 is fixed with a threaded rod 303, and the threaded rod 303 passes through the fixed block 301 fixed to the stepping motor 302, and the end of the threaded rod 303 away from the stepping motor 302 is rotatably connected to the fixed block 301 away from the stepping motor 302. When the stepping motor 302 drives the threaded rod 303 to rotate, it drives the sliding plate 304 to perform a stepping movement.

[0031] Furthermore, the threaded rod 303 is threadedly connected with a sliding plate 304. The top of the sliding plate 304 is in contact with the connecting plate 3. A force sensor 305 is fixed at the short side of the bottom of the sliding plate 304 close to the stepping motor 302. The upper end of the connecting rope 205 is fixed to one end of the force sensor 305 close to the stepping motor 302. When the threaded rod 303 is driven by the stepping motor 302, it drives the sliding plate 304 to slide under the connecting plate 3 and drives the force sensor 305 to move, pulling the connecting rope 205 at a constant speed. When the force sensor 305 is subjected to a pulling force, it displays the magnitude of the pulling force.

[0032] The operation process of this embodiment is as follows: When it is necessary to measure the viscosity coefficient of the fluid to be measured, start the air cushion guide rail 202. First, without pouring any liquid into the water tank 1, directly start the stepping motor 302 to drive the threaded rod 303 to rotate, drive the sliding plate 304 to slide at the bottom of the connecting plate 3. At the same time, the force sensor 305 is driven. After the moving direction of the connecting rope 205 connected to the force sensor 305 is changed by the fixed pulley 204, it pulls the light slider 4 to slide on the air cushion guide rail 202, driving the sliding port 401, the fixed rod 402 and the small ball 403 at the bottom of the light slider 4 to slide in the air. At this time, let the friction , between the light slider 4 and the air cushion guide rail 202 be the reading of the force sensor 305. The force sensor 305 reaches a uniform speed under the control of the stepping motor 302. Let the reading of the force sensor 305 be , then there is:

[0033]

[0034] When the liquid to be measured is poured into the water tank 1 and set up, the small ball 403 slides uniformly in the liquid to be measured in the water tank 1. Let the increased resistance of the small ball 403 be , let the speed set by the stepping motor 302 be , let the reading of the force sensor 305 at this time be , the radius of the small ball 403 be , the density of the liquid to be measured be , then when the small ball 403 slides in the liquid to be measured, there is the following formula derivation process

[0035]

[0036] Then there is

[0037]

[0038] That is

[0039]

[0040] Obtain the viscosity coefficient of the liquid to be measured; The force analysis of the small ball 403 during operation is as follows

[0041] .

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A liquid viscosity coefficient measuring device based on stepper motor control, comprising a water tank (1), a slide rail assembly (2), a connecting plate (3) and a lightweight slider (4), characterized in that: A slide rail assembly (2) is fixed on the top of the water tank (1), and the slide rail assembly (2) comprises a support plate (201) and an air cushion guide rail (202). Support plates (201) are fixed on both short sides of the top of the water tank (1), and the air cushion guide rail (202) is fixed between the two support plates (201). A fixing block (301) is fixed in the middle of the top of the two support plates (201), and a connecting plate (3) is fixed on the top of the two fixing blocks (301). A stepping motor (302) is fixed on one side of one of the fixing blocks (301). A lightweight slider (4) is movably connected to the outer side of the air cushion guide rail (202), a sliding opening (401) is provided in the lightweight slider (4), and the air cushion guide rail (202) passes through the sliding opening (401). A fixing rod (402) is fixed in the center of the bottom of the lightweight slider (4), and a small ball (403) is fixed at the bottom end of the fixing rod (402).

2. The liquid viscosity coefficient measuring device based on stepper motor control according to claim 1, characterized in that: An upper portion of one end of the water tank (1) is fixedly connected to a water outlet pipe (101), and a switch valve (102) is fixed around the water outlet pipe (101).

3. The liquid viscosity coefficient measuring device based on stepper motor control according to claim 1, characterized in that: The slide rail assembly (2) further comprises a connection frame (203), and a connection frame (203) is fixed to a side of the support plate (201) close to the stepper motor (302) and close to the air cushion guide rail (202), and the connection frame (203) is arranged above the air cushion guide rail (202).

4. The device for measuring liquid viscosity coefficient based on stepper motor control according to claim 3, characterized in that: The slide rail assembly (2) further comprises a fixed pulley (204) and a connecting rope (205); the fixed pulley (204) is rotatably connected in the connecting frame (203); the connecting rope (205) is wound around the fixed pulley (204); and the connecting rope (205) is fixed to the lightweight slider (4) at one end located at the bottom.

5. The device for measuring liquid viscosity coefficient based on stepper motor control according to claim 4, characterized in that: A threaded rod (303) is fixed to the output end of the stepper motor (302), and the threaded rod (303) passes through a fixed block (301) fixed to the stepper motor (302), and one end of the threaded rod (303) away from the stepper motor (302) is rotatably connected to the fixed block (301) away from the stepper motor (302).

6. The device for measuring liquid viscosity coefficient based on stepper motor control according to claim 5, characterized in that: The threaded rod (303) is threadedly connected to a sliding plate (304) on its circumferential side, the top of the sliding plate (304) is in contact with the connecting plate (3), a force sensor (305) is fixed to the bottom of the sliding plate (304) at a short side close to the stepping motor (302), and the upper end of the connecting rope (205) is fixed to one end of the force sensor (305) close to the stepping motor (302).

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