SU857353A2 - Vibrating hammer - Google Patents

Description

(54) VIBROMOLOT

one

The invention relates to the construction and can be used for immersion in the soil of piles, groove, casing and similar building elements, as well as for the destruction of rocks.

According to the main author. St. No. 249296 is known for a vibrating hammer for immersing piles and the like in elements, including an unbalance exciter and a cap, an electromagnet that is installed between the exciter and cap, and in a known device by switching an electromagnet on and off using a switch, for example, a switch is provided from work in vibration mode to work in vibro-impact mode and vice versa.

However, in the specified vibratory hammer, an increase in impact energy and efficiency in a shock mode of operation is achieved by increasing the mass of the impact part and the impact speed, which entails an increase in the dimensions and mass of the vibration hammer, as well as the power consumption. In addition, under impact, a part of the impact energy does not turn into useful work by immersing a building element or destroying the rock, "4 is lost upon rebound, which reduces the efficiency of the vibro-hammer.

The purpose of the invention is to increase the efficiency of the vibratory hammer in the shock mode by using the available electromagnet to increase the impact speed and increase the efficiency of energy transfer by reducing the rebound value and the loss of energy associated with it.

) Q This goal is achieved by the fact that the vibrating hammer is provided with sensors electrically connected with an electromagnet control unit, while one of the sensors is mounted on the head plate with the possibility of displacement in the vertical

5, and the other is mounted on one of the colliding parts of the vibratory hammer.

The drawing shows a diagram of the vibratory hammer.

The vibrohammer contains a shock part consisting of an unbalanced vibration exciter with directional oscillation bodies 2 with a striker 2 mounted on a spring suspension 3. On the striker 2 of the shock part there is a shock sensor 4 installed. Pile head 5

The sensor for the b coordinates of the impact part is installed. Between the exciter 1 and the pile cap 5, an electromagnet 7 is installed with a coil 8 fed by voltage U from a power source (not shown) through a contactless (thyristor) control unit 9. Electromagnet 7 is rigidly connected to head restraint 5. Inside immersed head 5 introduced immersed element (pile) 10.

The device works as follows.

When turned on, the vibration exciter 1 oscillates on the spring suspension 3, strikes striker 2 (through the base of the electromagnet) on the pile headboard 5, sending shock impulses to the submerged element (pile) 10. When the shock part moves in the direction of impact, the sensor 6 moves coordinates before applying impact (at a certain, predetermined distance between the shock part and the head cover), the control signal to the control unit 9, which, according to the sensor signal, turns on the coil 8 of the electromagnet 7. At the same time, An electromagnetic force starts to act on the vibro-hammer, which accelerates the impact part, increasing its impact speed and impact energy of the vibro-hammer, and on the other hand, acting at the moment of impact, reduces the rebound value of the impact part, increases the efficiency of the transfer of impact energy, thereby increasing the efficiency devices. At the moment of the collision, the sensor 4 of the impact delivers a control signal to the control unit 9 to switch off the electromagnet 7 so that the electromagnetic force does not prevent the shock part from moving in the opposite (impact) direction after the impact.

The displacement coordinate sensor 6 of the impact part is configured to adjust the impact coordinate of the impact part, which allows adjusting the moment of sending a control pulse to the control unit and the moment of switching on the electromagnet before the collision to optimize parameters, for example, to adjust the magnitude of the shock velocity. If the device needs to operate in the vibration mode, the sensors are not used, and the electromagnet by the control unit is turned on permanently. Due to the relatively large inductance (and constant

time) coils of the electromagnet and, based on the possible speed of the control unit, the intended use range of the device is limited by the frequency of the impacts of the vibro-hammer 500 beats per minute

Due to the fact that, according to the sensor signal, the displacement coordinates of the impact part, the control unit switches on the electromagnet immediately before the impact and leaves it turned on at the moment of the impact,

0a turns it off at the signal of the impact sensor immediately after the impact, and the following events occur. When turned on, the electromagnet accelerates the impact part due to the action of electromagnetic force on it, as a result of which the shock speed and impact energy increases, in addition, due to the action of electromagnetic force at the moment of impact, the rebound of the impact part and the energy loss associated with it decrease, due to which efficiency transmission

impact energy increases. Since the electromagnet is immediately switched off after the impact, this does not affect the normal operation of the device.

Thus, the proposed vibratory hammer allows to increase the efficiency of its

5 operation in udyr mode by increasing the impact energy without increasing the dimensions and mass of the vibro-hammer, increasing the impact speed when using an electromagnet with which the known vibro-hammer is equipped, and increasing the efficiency of transfer of the impact energy due to a decrease in the impact of the impact part during an impact.

Claims (1)

Invention Formula Vibrating hammer for immersion in the soil of piles and similar elements by author. St. No. 249296, characterized in that, in order to increase work efficiency, it is equipped with sensors electrically connected with an electromagnet control unit, wherein one of the sensors is mounted on the head plate with a possibility of displacement in the vertical plane, and the other is mounted on one of the colliding parts vibrohammer Sources of information taken into account during the examination 1. USSR Author's Certificate No. 249296, cl. E 02 D 7/18, 1966.