Function and scope of application:

Latex machine stability testerIt is mainly suitable for latex production units and research institutes to conduct mechanical stability testing on natural latex and synthetic latex, and is an essential instrument for improving latex quality.

The motor has a large backup capacity and is equipped with a high reliability, high torque high-speed motor. The speed control system can adjust the motor speed in real time according to changes in the motor load, ensuring accurate and stable speed adjustment.

Execution standard: meets the requirements of ISO 35 standard

Latex machine stability testerMain technical parameters:

1) Usage conditions: temperature 10 ℃~40 ℃, humidity<85% RH;

2) Mixing speed: 14000rpm ± 200rpm;

3) Indication error: ≤ 0.1%;

4) Measurement resolution: 1rpm;

5) Display mode: LED display;

7) Zui High Speed: 20000rpm; Minimum speed: 2000rpm;

8) Volume: 400mm × 350mm × 720mm;

9) Net weight: approximately 30kg;

10) Specification of mixing disc:

Natural rubber latex: diameter 20.83 ± 0.03mm, thickness 1.57 ± 0.05mm

Synthetic latex: diameter 36.12 ± 0.03mm, thickness 1.58 ± 0.05mm

11) Latex container: height 130 ± 2mm, inner diameter 58 ± 2mm

12) Can operate continuously for 1 hour

13) Instrument size: 400mm × 350mm × 740mm

14) Required space: 0.5m in front and back, 1.0m on both sides

15) Power supply: 2000VA 220VAC 50HZ

Structure and working principle:

The speed control part adopts advanced variable frequency speed control mode and uses negative feedback technology to accurately control the speed. It can meet the setting and adjustment of the speed in a wide range and has multiple display modes, which can directly display the speed.

The interference fit between the mixing disc and the mixing shaft is tightly assembled to ensure that the mixing disc and the rotating shaft are concentric. The motor has undergone a dynamic balance test to ensure that the shaft swing does not exceed 0.25mm at 14000rpm.

The latex container is connected using a flexible connection method and a bracket. The latex container is fixed by lifting or lowering the cup holder, and the fixed position of the limit sleeve along the column direction determines the distance between the bottom of the latex container and the bottom of the mixing disc. The position of this instrument has been adjusted, and users do not need to adjust the position of the limit sleeve.

The overall center of gravity of the instrument is stable, firmly supported, and not easily deformed. The positioning of the container is achieved by the upper positioning block.

Main structure and working principle

1. Main structure:

The instrument consists of three parts: (1) speed regulation and measurement part. The motor drives the high-speed rotating parts of the mixing shaft and disc. ⑶ Base and adjustable latex container.

Speed regulation and measurement part: frequency converter, speed display.

2. Working principle:

A high-speed motor with a long shaft and a stirring plate at the end of the shaft. The high-speed rotating motor drives the long shaft and the stirring plate connected to it to operate. The constant shear force of the metal disk horizontally stirs the latex and measures the content of solidified material produced after a specified time.

Operation and usage

1. Select the mixing plate as needed and fasten it onto the shaft.

2. Place the latex container on the container holder, tighten the lock button (note: be sure to tighten the container), take the required sample according to the regulations and pour it into the latex container. Rotate the container holder knob to the highest point, which is 13 ± 1mm from the bottom of the mixing plate to the bottom of the latex container. Place the protective cover in place to prevent the mixing shaft from colliding with the container and causing danger.

3. Connect the power supply (220V) and turn on the power switch.

4. Setting of speed value:

After turning on, the frequency converter displays "H234.0" and "H" in a flashing state, with the following number indicating the frequency value. At this time, it should display around 234.0. If it were not for the knob on the control panel, the frequency would be around 234 at a speed of 14000r/min because 1Hz ≈ 60r/min. The speed has been set to this value at the factory.

5. At this point, you can press the green "Run" button on the frequency converter panel, and the high-speed motor can automatically increase to 14000 ± 200r/min. After the motor runs smoothly, align the tachometer with the reflective paper attached to the mixing shaft to measure the speed, which should be around 14000 ± 200r/min. If not, it can be adjusted.

6. At the designated time, press the red "stop" button on the frequency converter panel to gradually stop the high-speed motor from rotating. After the motor stops, lower the container tray to the bottom. Loosen the container fastening screws and remove the container.

7. Rinse the mixing shaft and mixing plate with distilled water. (Latex corrodes the long axis and disc) Then remove the latex container and measure according to relevant standards.

8. Wash the latex container thoroughly after measurement, wait for the next use, and wipe the instrument clean.

9. Turn off the power switch.

6、 Precautions for use

1. The mixing shaft must be securely fastened to prevent detachment or inaccurate actual mixing speed at high speeds. Attention: The mixing shaft and glass container must be securely fastened to prevent collision between the mixing shaft and the glass container, which may cause the glass container to shatter and pose a danger. Do not disassemble high-speed motors by yourself.

2. Do not operate the frequency converter below 50Hz.

3. Do not impact the mixing shaft and mixing plate, and do not apply excessive radial force during loading and unloading.

4. During the operation of the motor, when the temperature of a certain part reaches 60 ℃, immediately introduce circulating water and continue running, or stop the machine for cooling.

5. When the value measured by the speedometer during the operation of the high-speed motor does not match the experimental value (14000 ± 200r/min), the knob on the adjustable frequency converter panel can be used to fine tune the output frequency to make the speed of the high-speed motor the correct value. The parameters of the frequency converter have already been set and do not need to be changed.

7、 Installation and commissioning of instruments

1. Place the instrument on a dry and vibration free platform.

2. Insert all the thin ends of the selected mixing shaft into the motor locking holes and tighten them with two wrenches (note: be sure to hold tightly to prevent detachment or tilting).

3. There are two circulating water nozzles on the motor of the instrument that can be freely selected for water inlet and outlet. We need to install a circulating water pipe.

4. Take out the speed measuring paper from the speedometer and stick it onto the mixing shaft.

Manufacturer of high-speed mechanical stability tester

The high-speed mechanical stability tester meets the requirements of GBT 8301-2008 Determination of Mechanical Stability of Concentrated Natural Latex and SHT 1151-1998 Determination of High speed Mechanical Stability of Synthetic Latex standards.

This instrument is mainly suitable for latex production units and research institutes to conduct mechanical stability tests on natural latex and synthetic latex, and is an essential instrument for improving latex quality. Our factory is a professional manufacturer of high-speed mechanical stability testers, with accurate test results and high cost-effectiveness, trusted by a wide range of customers.

Testing method for high-speed mechanical stability tester:
Firstly, dilute 100g of the sample with ammonia solution to achieve a solid content of 55% of the total mass fraction. Then, immediately heat the sample to 36-37 ℃ using a heating device while gently stirring. Then immediately filter the heated latex with a stainless steel wire mesh, weigh 80g of latex and place it in a container. Verify that the temperature of the latex should be at 35 ℃± 1 ℃. Place the latex in the designated position of the instrument for high-speed stirring and start timing until the endpoint is reached.

The judgment of the endpoint of the high-speed mechanical stability tester: Before reaching the endpoint, the vortex around the stirring rod becomes noticeably shallower, and the sound of the stirring device also changes. There are two methods to determine the endpoint:

1. Palm technique:
2. Water surface dispersion method
Main technical parameters:
1. Usage conditions: temperature 10 ℃~40 ℃, humidity<85% RH
2. Mixing speed: 14000rpm ± 200rpm
3. Latex container: flat bottomed glass bucket, height>100mm, inner diameter 58mm, outer diameter 63mm.
4. Low end diameter of mixing rod: 6.3mm
5. Mixing plate:
5.1 Diameter 36.12 ± 0.03mm, thickness 1.57 ± 0.05mm (suitable for synthetic latex)
5.2 Diameter 20.83 ± 0.03mm, thickness 1.57 ± 0.05mm (suitable for natural rubber latex)
6. Indication error ≤ 0.1%
7. Measurement resolution: 1 r/min
8. Display mode: Inverter LED display
9. Zui High Speed: 20000r/min
10. Zui low speed: 2000r/min
11. Power supply: 220V ± 10%, 50H2, 1500W
12. Dimensions: 400mm × 350mm × 720mm

Instrument usage guide:

After unpacking and removing the instrument, place it on the workbench. Rotate the feet to ensure that each foot is in stable contact with the workbench. Turn on the power and select the disc you need, tighten it onto the mixing shaft, pour the latex to be tested into a glass cup, place the cup on the instrument cup holder, move the cup holder to a fixed position and clamp it tightly. Click the "RUN" button on the controller to start the experiment. The default maximum speed of the instrument is 14000r/min (the maximum speed knob is set to 14000), which can be reached by setting it separately.

Instrument configuration:
Instrument host
Special glass cup
Natural latex mixer
Synthetic latex mixer
Speed measuring instrument