Relying on its own air distribution system, the compressed air enters the front and rear air chambers of the piston (hammer) alternately, so that the piston reciprocates continuously. The alloy ball teeth break the rock. According to the structural characteristics of the gas distribution system, the DTH hammer is divided into two types: valve type and valveless type.
(1) DTH hammer with valve. The air flow is controlled by the valve plate, and can be divided into side exhaust and central exhaust according to the exhaust mode. The side-exhaust valve DTH hammer is the earliest used, and its exhaust gas is discharged from the side of the hammer head. The exhaust gas of the central exhaust valve DTH hammer is discharged from the central hole of the hammer head. In comparison, the effect of removing cuttings by the central exhaust method is good, the service life of the hammer head is long, and the drilling efficiency is high.
(2) Valveless DTH hammer. There is no valve plate, and its gas distribution system consists of a group of holes arranged on the cylinder wall, which automatically distributes gas during the movement of the piston. In the total stroke of the piston movement, one section relies on the expansion of compressed air to do work. Under the same pressure conditions, the consumption of compressed air is only 2/3 of that of the valved DTH hammer.
According to the working pressure, the DTH hammer is divided into low pressure DTH hammer (0.5~0.7MPa), medium pressure DTH hammer (0.56~1.05MPa) and high pressure DTH hammer (0.56~2.46MPa), which are suitable for different working conditions. Down The Hole Bits,Dth Hammer,Down Hole Hammer Bits,Down Hole Hammer Drill Bits Gansu Lanzhou and Wuwei International Land Port Management and Operation Co.Ltd. , https://www.gslwyygs.com
Many high-end residential areas or office buildings have now installed pedestrian access gates at the entrances and exits to identify them and block outsiders to prevent accidents. The three roller gates have played a very positive role in this respect. This article will discuss the causes and solutions of the common problems of the three roller gates.
1. How to install the rotating rod?
Solution: 1) The gate is energized, and the gate is lifted manually to make the electromagnet at the bottom of the rod holder pull. Turn the turntable and press the block with the clamp to the bottom of the bracket, so that the position of the turntable on which the brake lever is installed is in the middle position. 2) Install the brake lever to tighten the screw and test.
2. How can an emergency ensure that the channel is unobstructed, or what port is the fire signal or emergency signal connected to the control panel?
Solution: 1) Power off; 2) Emergency signal or fire signal input to the test controller port of the gate controller, the lever is automatically dropped, and the channel is unblocked.
3. Power is not on the pole?
Reason analysis: 1) The lever is too up, the gate is lifted manually after the gate is energized, and the brake lever lock pushes the bottom of the lower rod bracket upward, but the position where the electromagnet can be attracted is not pushed. The rod cannot be buckled; 2) the brake rod and the pressure block are misaligned, and the pressure block cannot be buckled into the brake head.
Solution: 1) Power on the gate Manually press the bottom of the off-rod bracket upwards to make the electromagnet attract the iron block, then loosen the four screws that fix the rod bracket, and adjust the lower rod bracket to adjust it down to a suitable position. 2) If there is a deviation between the brake lever and the clamp, the three brake levers are replaced by the installation position.
4. Power off the pole
Analysis of the cause: The drop lever bracket is too up, causing the bottom of the brake lever to be lowered after the solenoid is desorbed.
Solution: Firstly press the bottom of the off-rod bracket upwards to make the electromagnet attract the iron block, then loosen the four screws that fix the rod bracket and press it down (usually stick the lock at the gate) ), finally tighten the screw and turn off the power test.
5. The indicator light is off.
Cause analysis: 1) The indicator terminal is not fully inserted or loose, resulting in poor contact; 2) The indicator light is faulty.
Solution: 1) Check if the indicator terminal is plugged in; 2) If the terminal is still not lit, then the indicator of the next door can be replaced with a good indicator. After the good indicator is replaced, the indicator is on. The original indicator light is broken and needs to be replaced. 3) The multimeter measures whether the 12V GND port of the indicator port has 12V voltage output, indicating that the circuit board is faulty and needs to be replaced.
6. The indicator light is always on the green arrow
Cause Analysis: The board signal output is abnormal or the indicator is faulty.
Solution: You can replace the good indicator on other gates. If the indicator is still lit, the green arrow indicates that the board is defective. You need to replace the board. Otherwise, it is a problem with the indicator. If there is no other good indicator, you can use the multimeter to measure whether D1 GND or D2 GND always has 12V voltage output.
7. Running sound is big
Cause analysis: buffer buffer is not strong enough
Solution: Increase the damping force: the nut of the buffer is screwed out counterclockwise, and the buffer is screwed clockwise. If it does not work, check if the spring inside the base of the plum blossom wheel is stuck or loses its elasticity. If it is, replace the base.
8. How to connect the remote control or button and press the button to open the door all the time, can the person pass all the time, press the button again and then close?
Solution: 1) Short-circuit the three-roller control panel Man1 Gnd (forward) or Man2 Gnd (outward direction), open or exit the door, cancel the shorting, the gate is closed; 2) the remote control or button supports the signal self-locking; 3) Example: 2-way wiring method
9. How many people can you brush once?
Cause analysis: 1) The travel switch is damaged, or the wire ends are not properly contacted. 2) The circuit board is faulty.
Solution: 1) Check the travel switch, whether the wire is off or the travel switch is damaged; 2) Check if the square electromagnet is always open and not closed; 3) Replace the control panel.
10. Can you achieve free access on the other side of the card?
Solution: Remove the lock arm on one side of the electromagnet, no need to swipe freely.
11. The swipe passer has not closed by one or two seconds of the gate, or how long does it wait after the card is swiped?
Solution: Check if the dial code is correct. The default is 2 and 4 or 3 4, and the waiting time is 5 seconds. If you still need to extend the waiting time, you can set the dialing code as needed and according to the instructions.
12. Sometimes the card is swiped but the lever cannot be pushed open?
Solution: 1) Whether the access control board relay has a beating sound when swiping, if there is no explanation that the card reading is unsuccessful (the access control relay delay needs to be set to 0 seconds or 1 second or the card has no permission; 2) whether the indicator light is switched immediately after swiping the card Green arrow, if not, check the access control wiring; 3) After the card is swiped, the indicator light turns to the green arrow, but open the chassis to observe that the electromagnet is not in the position, you need to adjust the electromagnet or replace the electromagnet.