阅读说明：本技术 一种强夯机起锤零点信号检测系统 (System for detecting zero point signal of lifting hammer of dynamic compactor ) 是由 张俊强 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种强夯机起锤零点信号检测系统,包括压绳缸和零点信号开关,压绳缸安装在卷扬机起重钢丝绳的出绳端,在压绳缸上设置有进口P和信号口K,信号口K与零点信号开关相连接,信号口K触发零点信号开关,零点信号开关与控制器连接。本发明的可以根据强夯机起锤零点信号得到卷扬机起重钢丝绳被拉直状态的出绳量,根据上下两次卷扬机起重钢丝绳被拉直状态的出绳量差值得到每次夯击深度,确保强夯机每次夯击能不变。(The invention discloses a zero signal detection system for a hammer of a dynamic compactor, which comprises a rope pressing cylinder and a zero signal switch, wherein the rope pressing cylinder is arranged at the rope outlet end of a hoisting steel wire rope of a winch, an inlet P and a signal port K are arranged on the rope pressing cylinder, the signal port K is connected with the zero signal switch, the signal port K triggers the zero signal switch, and the zero signal switch is connected with a controller. The invention can obtain the rope output amount of the hoisting steel wire rope of the winch in the straightened state according to the zero point signal of the hammer of the dynamic compactor, and obtain the tamping depth of each time according to the difference value of the rope output amounts of the hoisting steel wire rope of the winch in the straightened state of the hoisting steel wire rope of the upper and lower times, thereby ensuring that the tamping of the dynamic compactor can not be changed each time.)

1. The system for detecting the zero-point signal of the lifting hammer of the dynamic compaction machine is characterized by comprising a rope pressing cylinder (11) and a zero-point signal switch (22), wherein the rope pressing cylinder (11) is installed at the rope outlet end of a lifting steel wire rope of a winch (10), an inlet P and a signal port K are arranged on the rope pressing cylinder (11), the signal port K is connected with the zero-point signal switch (22), the signal port K triggers the zero-point signal switch (22), and the zero-point signal switch (22) is connected with a controller.

2. The system for detecting the zero signal of the lifting hammer of the dynamic compaction machine according to claim 1, wherein the rope pressing cylinder (11) is an air cylinder or an oil cylinder, and when an inlet P of the rope pressing cylinder (11) is aerated or oil is obtained, the rope pressing cylinder (11) extends out, a signal port K is aerated or oil is obtained; when the rope pressing cylinder (11) retracts, the signal port K cuts off gas or oil.

3. The system for detecting the zero point signal of the dynamic compactor lifting hammer according to claim 1, which is characterized by comprising a lead valve (20), an oil-gas valve (19), a relay valve (21) and a secondary brake clamp; the secondary braking clamp is used for braking the winch (10); the air inlets of the pilot valve (20) and the oil-gas valve (19) are communicated with a pilot control air source, the air outlet of the oil-gas valve (19) is communicated with the control port of the pilot valve (20), the control port of the oil-gas valve (19) is communicated with a hammer-starting pilot oil way, the air outlet of the pilot valve (20) is communicated with the air inlet of the relay valve (21), the air outlet of the relay valve (21) is communicated with a secondary brake clamp control air path, and the control port of the relay valve (21) is communicated with a signal port K.

4. The system for detecting the zero point signal of the dynamic compactor lifting hammer according to claim 3, wherein in a normal state, an air inlet of the pilot valve (20) is communicated with an air outlet; the air inlet and the air outlet of the oil-gas valve (19) are disconnected, and the air inlet and the air outlet of the relay valve (21) are disconnected.

5. The system for detecting the zero-point signal of the hammer-lifting of the dynamic compaction machine according to claim 3, wherein the system comprises a non-unhooking mode switching valve (12), wherein an air outlet of the non-unhooking mode switching valve (12) is communicated with an air inlet of a pilot valve (20) and an oil-gas valve (19), and an air inlet of the non-unhooking mode switching valve (12) is communicated with a pilot control air source.

6. The system for detecting the zero signal of the lifting hammer of the dynamic compaction machine according to claim 3, wherein when the pilot oil path of the lifting hammer is not oiled, and the rope pressing cylinder (11) extends out of a signal port K to be oiled or oiled, the secondary brake clamp (9) performs brake clamping; when the hammer is started and the oil is supplied to the oil guide oil path or the rope pressing cylinder (11) retracts to the signal port K to cut off air or oil, the secondary brake clamp (9) is braked and released.

7. The system for detecting the zero point signal of the lifting hammer of the dynamic compaction machine according to any one of claims 1 to 6, wherein before each lifting hammer, the controller firstly controls the rope pressing cylinder (11) to extend to press the lifting steel wire rope; when the hammer is started, the rope pressing cylinder (11) retracts under the reaction force of a hoisting steel wire rope, the controller collects on-off signals of the zero signal switch (22), and the controller determines the zero signal of the hammer starting of the dynamic compactor according to the signals of the zero signal switch (22).

Technical Field

The invention relates to the field of machinery, in particular to a zero signal detection system for a hammer of a dynamic compactor.

Background

The dynamic compactor uses a winch to repeatedly and vertically lift a rammer, and uses high impact generated by the high fall of the rammer to tamp the foundation. The tamping energy of the dynamic compactor is the height of the falling distance x the weight of the rammer, for example: the weight of the rammer is 30T, the drop height is 15m, and the ramming energy is 30 multiplied by 15 to 450KN. The drop height refers to the free drop height of the ram. The working mode of the dynamic compactor comprises a unhooking mode and a non-unhooking mode, wherein the unhooking mode refers to the mode that a unhooking device is connected to a hoisting steel wire rope of the dynamic compactor, the unhooking device hooks a rammer to the height of a falling distance (namely a ramming state), the unhooking device releases the rammer (namely a ramming state), the rammer falls freely, and the unhooking device does not fall along with the rammer. The unhooking mode is that a hoisting steel wire rope of the dynamic compactor is directly connected with a rammer, after the rammer is lifted to a falling distance height (namely, in a rammer lifting state), a brake mechanism and a clutch mechanism of the winch are loosened, the rammer falls freely (namely, in a rammer releasing state), and the winch rotates reversely under the pulling force of the rammer. Because the unhooking mode is ramming the in-process at every turn, all need transfer jack-up wire rope and detacher and rammer couple the action, cause the work efficiency of unhooking mode very low, non-unhooking mode is ramming the in-process at every turn, need not transfer jack-up wire rope and couple the action, consequently, the work efficiency of non-unhooking mode is higher than the work efficiency of unhooking mode far away.

At present, in a unhooking mode, a unhooking rope is connected with a detacher of a dynamic compactor, and when a hammer is lifted to a drop distance height, the unhooking rope is straightened, and the hammer is released from the detacher. This fall apart from height is with the ground as zero point, and at each time the ramming in-process, the ground can sink and becomes the ramming pit, causes the height of falling apart from each time and can increase, and ramming can increase at every turn. In addition, the ramming pit height cannot be detected.

Under the non-unhooking mode, the condition takes place very big change, and the hoist engine reverses under the pulling force of ram, and the ram descending speed of free falling body is very fast for the hoist engine reversal speed is very high, and after the ramming, the ram lands, and the hoist engine is under inertial effect, and the hoist engine chance continues to rotate, and the jack-up wire rope that causes the hoist engine goes out the rope volume and can be many, influences ramming next time, and the uncontrollable falls apart from the height, also can't detect the ramming pit height.

Disclosure of Invention

In view of this, the invention provides a system for detecting a zero point signal of a starting hammer of a dynamic compactor, which can work in a non-unhooking mode, can detect the tamping depth of each time, and ensures that the falling distance height and the tamping of the dynamic compactor are unchanged each time.

On one hand, the invention provides a zero signal detection system for a hammer of a dynamic compactor, which comprises a rope pressing cylinder and a zero signal switch, wherein the rope pressing cylinder is arranged at the rope outlet end of a hoisting steel wire rope of a winch, an inlet P and a signal port K are arranged on the rope pressing cylinder, the signal port K is connected with the zero signal switch, the signal port K triggers the zero signal switch, and the zero signal switch is connected with a controller.

Furthermore, the rope pressing cylinder is an air cylinder or an oil cylinder, and when the rope pressing cylinder is extended out from an inlet P of the rope pressing cylinder, the signal port K is inflated or oil is obtained; when the rope pressing cylinder retracts, the signal port K cuts off gas or oil.

Further, the device comprises an advance valve, an oil-gas valve, a relay valve and a secondary brake clamp; the secondary braking clamp is used for braking the winch; the air inlets of the pilot valve and the oil-gas valve are communicated with a pilot control air source, the air outlet of the oil-gas valve is communicated with the control port of the pilot valve, the control port of the oil-gas valve is communicated with a hammer starting pilot oil path, the air outlet of the pilot valve is communicated with the air inlet of the relay valve, the air outlet of the relay valve is communicated with a control air path of the secondary brake clamp, and the control port of the relay valve is communicated with a signal port K.

Further, under the normal state, the air inlet of the pilot valve is communicated with the air outlet; the air inlet and the air outlet of the oil-gas valve are disconnected, and the air inlet and the air outlet of the relay valve are disconnected.

And further, the air outlet of the non-unhooking mode switching valve is communicated with the air inlets of the advance valve and the oil-gas valve, and the air inlet of the non-unhooking mode switching valve is communicated with the pilot control air source.

Further, when the pilot oil path of the hammer is not supplied with oil, the rope pressing cylinder extends out of the signal port K to be supplied with air or oil, and the secondary brake clamp is used for braking and clamping; when the hammer is started and the oil is supplied to the oil guide oil path or the air or oil is cut off from the rope pressing cylinder retraction signal port K, the secondary braking clamp is braked and released.

Further, before each hammer lifting, the controller firstly controls the rope pressing cylinder to extend out to press the lifting steel wire rope, when the hammer is lifted, the rope pressing cylinder retracts under the counter-acting force of the lifting steel wire rope, the controller collects on-off signals of the zero signal switch, and the controller determines the zero signal of the hammer lifting of the dynamic compactor according to the zero signal switch signal.

Compared with the prior art, the zero signal detection system for the hammer of the dynamic compactor has the beneficial effects that:

1. before each hammer lifting, the controller firstly controls the rope pressing cylinder to extend out to press the hoisting steel wire rope, when the hammer is lifted, the rope pressing cylinder retracts under the reaction force of the hoisting steel wire rope, the hoisting steel wire rope is straightened, the controller collects on-off signals of the zero signal switch, and the controller determines the zero signal of the hammer of the dynamic compactor according to the zero signal switch signal. The rope discharging amount of the hoisting steel wire rope of the winch in the straightened state can be obtained according to the zero point signal of the hoisting hammer of the dynamic compactor, and the tamping depth of each time can be obtained according to the rope discharging amount difference value of the hoisting steel wire rope of the winch in the straightened state of the upper and lower times, so that the falling distance height and the tamping energy of the dynamic compactor are unchanged each time.

2. When the rope pressing cylinder stretches out to press the hoisting steel wire rope each time, the winch is braked through the secondary braking clamp, and in order to prevent the winch from rotating under the action of the rope pressing cylinder, the zero point signal of the hammer of the dynamic compactor is prevented from being influenced and detected.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a zero signal detection system of a hammer of a dynamic compactor.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in FIG. 1, the invention provides a zero signal detection system for a hammer of a dynamic compactor, which comprises a rope pressing cylinder 11 and a zero signal switch 22, wherein an inlet P is arranged in a rodless cavity of the rope pressing cylinder 11, a signal port K is arranged in the middle of the rope pressing cylinder 11, and an outlet T is arranged in a rod cavity of the rope pressing cylinder 11. The rope pressing cylinder 11 is an air cylinder or an oil cylinder, and when the rope pressing cylinder 11 is extended out from an inlet P of the rope pressing cylinder 11, a signal port K is aerated or oiled; when the rope pressing cylinder 11 retracts, the signal port K cuts off gas or oil. One end of the zero signal switch 22 is connected with the controller, and the other end of the zero signal switch 22 is connected with the power supply. The rope pressing cylinder 11 is installed at the rope outlet end of the hoisting steel wire rope of the winch 10, the signal port K is connected with the zero signal switch 22, and the signal port K triggers the zero signal switch 22 to enable the zero signal switch 22 to be switched on and off.

In order to prevent the winch from rotating under the action of the rope pressing cylinder 11 and influence the detection of the zero point signal of the hammer of the dynamic compactor. In a further technical scheme, when the rope pressing cylinder 11 extends out to press the hoisting steel wire rope each time, the winch 10 is braked by a secondary brake clamp, and the winch comprises a non-unhooking mode switching valve 12, an advance valve 20, an oil-gas valve 19, a relay valve 21 and a secondary brake clamp (not shown in the figure); the secondary braking clamp is used for braking the winch 10; the air inlets of the pilot valve 20 and the oil-gas valve 19 are communicated with a pilot control air source, the air outlet of the oil-gas valve 19 is communicated with the control port of the pilot valve 20, the control port of the oil-gas valve 19 is communicated with a hammer starting pilot oil path, the air outlet of the pilot valve 20 is communicated with the air inlet of the relay valve 21, the air outlet of the relay valve 21 is communicated with a secondary brake clamp control air path, and the control port of the relay valve 21 is communicated with a signal port K. The air outlet of the non-unhooking mode switching valve 12 is communicated with the air inlets of the pilot valve 20 and the oil-gas valve 19, and the air inlet of the non-unhooking mode switching valve 12 is communicated with the pilot control air source.

In a normal state, the air inlet and the air outlet of the pilot valve 20 are communicated; the air inlet and the air outlet of the oil-gas valve 19 are disconnected, and the air inlet and the air outlet of the relay valve 21 are disconnected.

The working process of the zero signal detection system for the hammer of the dynamic compactor is as follows,

the non-unhooking mode switching valve 12 is switched to the non-unhooking mode, the non-unhooking mode switching valve 12 is opened, and the pilot control air source enters the air inlet P of the advance valve 20 and the oil-gas valve 19 through the non-unhooking mode switching valve 12. Before each hammer lifting, an air source enters an inlet P of the rope pressing cylinder 11, the rope pressing cylinder 11 extends out to press the hoisting steel wire rope, and the hoisting steel wire rope is pressed. At the moment, the signal port K of the rope pressing cylinder 11 is inflated, the relay valve 21 is opened, the zero signal switch 22 is opened, the pilot control air source enters the secondary brake clamp control air path through the pilot valve 20 and the relay valve 21, the winch 10 is braked, the winch 10 is prevented from reversing under the action force of the rope pressing cylinder 11, and the zero signal of the hammer of the dynamic compactor is prevented from being influenced and detected.

When the hammer is started, the oil gas valve 19 is opened, the advance valve 20 is disconnected, the secondary brake clamp is released, the rope pressing cylinder 11 retracts under the reaction force of the lifting steel wire rope, the signal port K of the rope pressing cylinder 11 is cut off, the relay valve 21 is disconnected, and the zero point signal switch 22 is disconnected. The controller collects the on-off signal of the zero signal switch 22, the controller determines the zero signal of the hoisting hammer of the dynamic compaction machine according to the signal of the zero signal switch 22, and at the moment, the controller collects the number of rotation turns of the winch 10 to calculate the rope output amount of the hoisting steel wire rope. According to the change value of the rope outlet quantity of the hoisting steel wire rope of the zero point signals of the upper and lower hammers, the tamping depth of each time can be detected, and the height of the falling distance of the dynamic compactor and the tamping can be ensured to be unchanged.

In the non-unhooking mode, the clutch oil cylinder 23 and the brake oil cylinder 24 are linked. Comprises a first hydraulic control valve 14, a second hydraulic control valve 15, a pilot control valve 18, a hydraulic accumulator 13, a first shuttle valve 16 and a second shuttle valve 17; the brake mechanism 8 comprises a brake cylinder 24, and the clutch mechanism 8 comprises a clutch cylinder 23;

the port B of the first hydraulic control valve 14 is communicated with the clutch oil cylinder 23, the port B of the second hydraulic control valve 15 is communicated with the rodless cavity of the band-type brake oil cylinder 24, the rod cavity of the band-type brake oil cylinder 24 is communicated with the hydraulic energy accumulator 13, and the port P of the first hydraulic control valve 14 and the port P of the second hydraulic control valve 15 are communicated with the hydraulic energy accumulator 13; the O port of the first hydraulic control valve 14 and the O port of the second hydraulic control valve 15 are oil return ports; the port a of the first hydraulic control valve 14 and the port a of the second hydraulic control valve 15 are plugging ports;

in a normal state, the first hydraulic control valve 14 is located at the left position, the port P of the first hydraulic control valve 14 communicates with the port a of the first hydraulic control valve 14, and the port O of the first hydraulic control valve 14 communicates with the port B of the first hydraulic control valve 14; when the first hydraulic control valve 14 is positioned at the right position, the port P of the first hydraulic control valve 14 communicates with the port B of the first hydraulic control valve 14, and the port O of the first hydraulic control valve 14 communicates with the port a of the first hydraulic control valve 14;

in a normal state, the second hydraulic control valve 15 is located at a left position, a port P of the second hydraulic control valve 15 is communicated with a port a of the second hydraulic control valve 15, and a port O of the second hydraulic control valve 15 is communicated with a port B of the second hydraulic control valve 15; when the second hydraulic control valve 15 is positioned at the right position, the port P of the second hydraulic control valve 15 communicates with the port B of the second hydraulic control valve 15, and the port O of the second hydraulic control valve 15 communicates with the port a of the second hydraulic control valve 15.

A control port of the second hydraulic control valve 15 is communicated with an output port of the first shuttle valve 16, a control port of the first hydraulic control valve 14 is communicated with a first input port of the first shuttle valve 16, a second input port of the first shuttle valve 16 is communicated with an output port of the second shuttle valve 17, a first input port of the second shuttle valve 17 is communicated with a port B of the pilot control valve 18, and a control port of the first hydraulic control valve 14 is communicated with a port A of the pilot control valve 18;

the pilot control valve 18 is a three-position four-way valve, a control port at the left end of the pilot control valve 18 is connected with a hammer starting pilot oil path, and a control port at the right end of the pilot control valve 18 is connected with a hammer releasing pilot oil path. The middle position of the pilot control valve 18 is a Y position function, when the pilot control valve 18 is located at the left position, the port P of the pilot control valve 18 is communicated with the port a of the pilot control valve 18, and the port O of the pilot control valve 18 is communicated with the port B of the pilot control valve 18; when the pilot control valve 18 is positioned at the right position, the port P of the pilot control valve 18 communicates with the port B of the pilot control valve 18, and the port O of the pilot control valve 18 communicates with the port a of the pilot control valve 18; the O port of the pilot control valve 18 is an oil return port.

When the hammer starting pilot oil way obtains oil, the pilot control valve 18 is in the left position, the clutch mechanism 8 is closed, and the brake mechanism 8 is opened (namely in a non-braking state), so that the rising action of the rammer is realized. When the hammer releasing pilot oil way obtains oil, the pilot control valve 18 is in the right position, the clutch mechanism 8 is separated, the brake mechanism 8 is opened (namely in a non-braking state), and the free falling body lowering action of the rammer is realized. When the pilot control valve 18 is in the middle position, the clutch mechanism 8 is separated, the brake mechanism 8 is closed (i.e. in a braking state), and the air start-stop action is realized, and the clutch oil cylinder 23 and the brake oil cylinder 24 control the hydraulic oil path to have ingenious structure and good stability and safety.

The techniques not described above are common general knowledge of the skilled person. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.