How many steps does the concrete mixer have?

Concrete mixers are different from ordinary vehicles. Because the mixing barrel behind the concrete mixer needs to rotate all the time during transportation, it is difficult to drive, and the driver needs to be experienced and cautious. Moreover, the gear of the mixer is different from that of ordinary vehicles, so how to shift gears when driving a concrete mixer? How many steps does the concrete mixer have? Next, let's introduce the related contents of shifting the mixer. Let's take a look. 1. How many gears does the concrete mixer have?

Generally, there are eight, ten and twelve concrete mixers.

1. If the mixer is in 9th gear, it is equipped with high and low gear boxes.

When shifting between high and low gears, the shifting between high and low gears can only be performed between the last gear 4 of low gear and the first gear 5 of high gear. If you change gears, such as 4 to 6, 7 to 3, etc. The friction belt will wear prematurely because of the large speed difference of the auxiliary box synchronizer. The high-grade friction belt is exposed, and the clicking sound will be heard at the moment when it turns from low to high, and vice versa. This is because the synchronous work of gears after the synchronizer friction belt fails depends on the impact and combination of synchronizer meshing teeth with low-grade reduction gears or high-grade driving gears. Further, the upper gear is engaged, and further, the auxiliary box is out of gear.

When shifting from high gear to low gear, it is necessary to consciously pause for a moment (normally within 1 sec) after hitting the neutral gear of one gear horizontally to the neutral gear of another gear to ensure the successful combination of synchronizers in the auxiliary gearbox. Generally, it is based on the sound of synchronizer when shifting gears, and then you can hang in the target gear you want to shift gears. If the auxiliary box has not been successfully combined (such as rough shifting, unstable air pressure in the airway, poor airway, etc.). ), you will hang the gear of the main box, which may cause the synchronizer of the auxiliary box to fail, such as broken pin, and even lead to the explosion of the auxiliary box.

2. If it is a single H-operated gearbox.

There is only one neutral position in the single H-operated transmission gear, and all gears corresponding to the low gear and the high gear are coincident positions, including the neutral position. Therefore, its high and low gears are not achieved by horizontal racket, but by pulling the high and low toggle button on the side of the cab shift handball up and down. Down is low, up is high. The single H valve is actually a one-way valve, and the air flow can shift gears between 1.2.3.4 gears by pushing the shift fork. Single H valve is used for basic gear shifting without auxiliary box.

3. If it is a double H-controlled gearbox.

The double H valve is a two-way valve, one realizes the shift of 1.2.3.4, and the other realizes the shift of high-speed 5.6.7.8 gear through the auxiliary box. Double H valve is mainly used to realize high and low gears and basic gears together with the auxiliary box. The main box and the transfer box are separated, and the shift action of the main box and the shift action of the auxiliary box need to be carried out at the same time, which is combined to shift to a high gear, and this needs to be realized by a two-way air valve.

Second, how to shift gears when opening a concrete mixer?

1. Start in gear: For the gearbox with high and low speed control, the transmission ratio of low gear is relatively large, so when we start in neutral gear or flat gear, we can start in third gear or fourth gear. If we start from heavy vehicles or slopes, we must use second gear. Start the ignition of the vehicle, press the clutch lightly on the accelerator, look at the tachometer to about 2000 rpm, release the clutch and brake, and the vehicle will start. Put in second gear, pull it back to neutral to the left and then pull it back.

2. High-speed gear shifting: When driving on the expressway, the upshift mode of 1-3-5 is generally adopted, starting at a low speed and then shifting at a high speed. For example, when starting in the third gear at low speed, step on the accelerator, pull the accelerator back to neutral, shift to the high speed and directly shift to the fifth gear. When the vehicle speed increases, directly shift to 7th gear. When the car is in the third gear, the speed is usually between 25 and 40 miles per hour. If you are a beginner, it is recommended to develop good habits step by step.

3. Variable speed shifting: In variable speed shifting, we must keep in mind the principle of accelerating first and then decelerating. Step on the accelerator to increase the speed before upshifting, and retract the accelerator to decrease the speed before downshifting. Try to separate your feet when shifting gears. When shifting gears, according to the principles of stepping on (clutch), picking (neutral), stepping on (clutch) and shifting gears (high-grade), you can easily shift gears by quickly stepping on the two-foot clutch pedal.

4. Shift gears up and down the slope: shift to low gear in advance when going uphill, and try not to shift gears on the slope. It is forbidden to change high and low speed in the middle of the slope; It is forbidden to slide in neutral when going downhill, and it is forbidden to change high and low speeds; It is forbidden to shift into a low gear when the vehicle speed is higher than 30km/h, and so on.