Method to control impact energy of hydraulic impact machine and adjustable hydraulic impact machine

FIELD: metal pipe driving.

SUBSTANCE: according to proposed method including change of value of backward stroke of striker interacting with operating resilient member and working liquid and stepless change of working liquid pressure at which striker changes from backward to forward stroke by changing force of preliminary compression of setting resilient member interacting with valve, it is proposed to control additional speed of valve forward stroke so that time of valve closing be not less than time of forward stroke of striker. Adjustable hydraulic impact machine contains striker unit and impact energy control device. Striker unit includes housing accommodating first working chamber, striker and operating resilient member. Impact energy control device is made in form of housing with second working chamber and valve interacting with setting resilient member. First and second working chambers are hydraulically coupled. Impact energy control device should be preferably equipped with valve forward stroke speed regulator including hydraulically independent shock-absorbing chamber with shock-absorbing liquid divided into upper and lower parts by ring-shock-absorbing piston arranged on valve. Upper and lower parts of shock-absorbing chamber are interconnected through channels, shutoff valve and restrictor.

EFFECT: enlarged sphere of application and improved reliability in operation.

3 cl, 1 tbl, 1 dwg

 

The invention relates to the field of engineering, namely, hydraulic drum machines with adjustable impact parameters, which can be used, for example, for driving metal pipes in trenchless laying of engineering communications.

The known method of regulating the power stroke of the hydraulic shock machine by changing the amount of the return stroke of the striker and adjustable hydraulic shock machine (drill head RPH 400 firm Sekoma), described in the book Apparience, Aigebra, “Hydraulic drum machine”, Novosibirsk, 1991, p.26, Fig.12. Regulation of the magnitude of the return stroke of the striker carried out discretely, using four channels made in the device and connecting the pressure line with a controllable camera slide valve, which switches the drummer from reverse to direct. The value of the return stroke of the striker depends on which of the four channels that are opened alternately by the edge of the striker at the back of the course, left United with a controllable camera spool (the other three choke by screwing special screws). The moment of switching drummer with reverse on the line, and hence the magnitude of the reverse, depends on the location of the channel is not muted.

The above-described method of regulating the project impact energy discrete (stepwise), it allows you to set only four discrete (number of channels) values reverse in a given throttle and does not allow you to change the boundary values of the throttle, which ultimately limits the scope of application of the method and the functionality of the hydraulic machine, which is implemented this way. The lack of ability to remote control the magnitude of the reverse also leads to limit the scope of the method and the functionality of the hydraulic percussive machine. In addition, for the implementation of this method requires a complex design of hydraulic percussive machine, which reduces the convenience of regulation, so as to change the magnitude of the impact energy required to stop the shock site and permutation special screws (caps).

Known selected as the closest analogue of the method of adjusting the impact energy of the hydraulic percussive machine by changing the amount of the return stroke of the striker and adjustable hydraulic shock machine according to the patent of Russian Federation №2184847.

In the known method of regulating the power stroke of the hydraulic shock machine change in a given throttle magnitude of the reverse stroke of the striker, interacting with the working of the elastic element and working fluid, and PL is the EIT change the value of the pressure of the working fluid when the switching stroke of the striker with the reverse in a straight line, by modifying the efforts of the pre-compression interacting with valve sets of the elastic element, the rigidity is much less than the rigidity of the work of the elastic element. The range of regulation of the magnitude of the return stroke of the striker may move towards smaller or larger values by a corresponding increase or decrease attached to the drummer of the efforts of the pre-compression of the working of the elastic element, and the value of the pressure of the working fluid, in which the switching stroke of the striker with the reverse in a straight line, can be changed remotely.

Adjustable hydraulic shock machine according to the patent of Russian Federation №2184847 contains a shock site and control the impact energy and impact site includes a casing in which is located the first working chamber, a drummer and a work of the elastic element, and a management tool impact energy is made in the form of a body placed in it the second working chamber and a valve communicating with the rod and defining an elastic element with a device to force changes its pre-compression, while the first and the second working chamber hydraulically connected.

Closest to the proposed method and the device for its realization, allow PLA is but (stepless) to adjust the impact energy in a wide range of values, in which the value of the return stroke can be adjusted continuously throughout a given interval of regulation, however, have an important drawback, which prevents reliable operation. The disadvantage is that the speed of the reverse valve is not adjustable, so that the time of valve closing may be less time forward stroke of the striker. When the compression sets of the elastic element pressure in the second working chamber and the first working chamber of the shock of the node increases. Consequently, this increases the compression work of the elastic element and increases the value of the return stroke of the striker. Due to the fact that increased the value of the return stroke of the striker, increases the magnitude of the stroke of the striker and the amount of working fluid in the first working chamber and thus increases the stroke of the striker, which consequently requires more time for draining the working fluid from the first working chamber. Draining the working fluid from the first working chamber is performed only when the open valve. However, increasing the force of the compression sets of the elastic element leads to a reduction in time forward stroke of the valve, which closes before it manages to leave the working fluid from the first working chamber, which is necessary for the completion of the stroke of the striker. Shock does not occur. In affect, the, limited control range power hydraulic drum machine and reduces the reliability of its work.

The invention is directed to solving the problem of enlargement of the control range of the impact energy of the hydraulic percussive machine and improve the reliability of its operation.

The invention consists in that in the method of adjusting the impact energy of the hydraulic percussive machine comprising a change in a predetermined throttle value reverse drummer, interacting with the working of the elastic element and working fluid, and a smooth change in pressure of the working fluid, in which the switching stroke of the striker with the reverse in a straight line, by modifying the efforts of the pre-compression interacting with valve sets of the elastic element, the rigidity is much less than the rigidity of the work of the elastic element, it is proposed to additionally adjust the speed of forward travel of the valve so that the closing time of the valve was not less than the time of forward stroke of the striker. While the range of regulation of the magnitude of the return stroke of the striker may move towards smaller or larger values by a corresponding increase or decrease attached to the drummer of the efforts of the pre-compression of the working of the elastic element.

The essence of the image is to be placed is also in adjustable hydraulic drum machine, drums containing the node and control the impact energy and impact site includes a casing in which is located the first working chamber, a drummer and a work of the elastic element, and a management tool impact energy is made in the form of a body placed in it the second working chamber and a valve communicating with the rod and defining an elastic element with a device to force changes its pre-compression, while the first and the second working chamber hydraulically connected, we offer a management tool impact energy is further provided with a speed regulator for forward travel of the valve, including hydraulically Autonomous depreciation camera with depreciation the liquid is divided into upper and lower parts of the ring damping piston, which is located on the valve, while the upper and lower amortization camera connected via channels through a check valve and choke.

In the present invention the introduction of adjusting the speed of the forward stroke of the valve so that the closing time of the valve was not less than the time of forward stroke of the striker, allows you to extend the control range of the impact energy of the hydraulic percussive machine and increase the reliability of its work due to the fact that there is accounting related to the spine of the magnitude of the impact energy, due to the pressure of the working fluid and the duration of the cycle being the drummer, the amount of time a forward stroke of the valve. The offset within the throttle towards smaller or larger boundary values provides a wider range of impact energy.

Introduction to the management tool, the impact energy of the speed controller forward stroke of the valve, including hydraulically Autonomous cushioning chamber separated by an annular cushioning piston located on the valve, the upper and lower parts, which are interconnected through a check valve and orifice through channels allows you to adjust using the throttle pressure depreciation of the liquid in the lower part of the damping chamber, and hence the flow rate of depreciation of fluid from the lower part at the top that allows you to adjust the time forward stroke of the valve.

The drawing shows a diagram of the hydraulic percussive machine, impact energy which is governed by the proposed method.

Hydraulic percussion drum machine contains a node with energy storage and management tool impact energy. Shock site includes a housing 1, in which the posted speed drummer 2 with the working of the elastic element (battery power) as the working of the spring 3. Working spring 3 Ref the bottom status presses drummer 2 to the anvil 4 with effort, equal to the force of its pre-compression. Between the inner walls of the housing 1 and drummer 2 is the first working chamber 5. The force of the pre-compression of the working spring 3 (force of friction is neglected) is set by the regulator efforts of the preliminary compression is made in the form of a screw 6. Alternatively, instead of the working spring 3 can be used gas accumulator, in this case, the pre-compression force to regulate the initial gas pressure in the accumulator. For air circulation during the operation of the machine in case 1 there are holes 7. The management tool impact energy includes a housing 8 within which is placed hydrosoft containing valve 9, is pressed against the seat 10 with driving spring 11. The adjusting screw 12 is used to force changes to the preliminary compression setting of the spring 11. The rod 13 is an axial channel 14 and the radial channels 15. On the rod 13 is made annular groove 16, in which there are radial channels 15. The valve 9, the spindle 13 and the casing 8 form a second working chamber 17 connected to the pressure line 18, and the drain cavity 19 that is connected with the drain line 20. Between the seat 10 and the valve 9 has a cavity 21. The rod 13, in an idle state constantly relies on rubber shock absorber 22. The working chamber 5 drums node connected by a pipe 23 with robocallers 17 controls. The length of the hose 23 is dependent on the execution machine with remote or direct regulation of the magnitude of the stroke. For air circulation during the operation of the machine in the casing 8 is made of the window 24. In order to avoid significant losses of energy management tool accumulating capacity specifies the springs 11 many times, for example 5 to 10 times less accumulating capacity of the working of the spring 3. The stiffness setting of the spring 11 in the lot (for example, 10 or more) times smaller than the rigidity of the working of the spring 3. The management tool impact energy is supplied by a speed controller forward stroke of the valve, including hydraulically Autonomous cushioning chamber 25 with damping fluid, separated located on the annular valve damping piston 26 on the upper and lower parts, which are interconnected through channels 27 and 28 through a check valve 29 and the throttle 30. Shut-off valve 29 passes cushioning fluid in one direction only. The choke 30 may, for example, be a sleeve, the internal diameter of which is controlled by the adjusting element, thereby adjusting the diameters between the bottom channel 27 and the upper channel 28.

The machine operates as follows.

The working fluid from the pressure line 18 is fed simultaneously in the working chamber 17 and the means of control and impact site. Under the pressure of the incoming fluid hydrosoft formed by the valve 9 and the seat 10, and drummer 2 do the reverse, i.e. upwards, squeezing setting and working of the spring 11 and 3.

In the process of reverse annular groove 16 on the rod 13 with radial channels 15 is moved from the discharge cavity 19 by cutting axial channel 14 from the drain line 20. Reverse shaft 13, and therefore drummer 2 continues until the upper edge of the annular groove 16 in the working chamber 17, where the pressure of the working fluid in the cavity 21 will be equal to the pressure in the working chamber 17, which is set using the adjustment efforts of the pre-compression specifies the springs 11. The pressure of the working fluid acting on the full cross-section of the stem 13 and the valve 9, opens the valve 9 with the saddle 10. The saddle 10 with the rod 13 rush down, the pressure in the working chambers 17 and 5 is reduced, and the drummer starts a direct course. The pressure in the working chamber 17 is kept at a certain level, since his fall in the movement of the rod 13 down is compensated to some extent by the inflow of the working fluid from the pressure line 18 and the working fluid displaced from the working chamber 5 of the working spring 3 with the direct course of the striker 2. At the end of the forward stroke of the rod 13 radial channels 15 fully out by the main cavity 19, and the working chamber 17 and 5 are communicated with the drain line 20. However, the pressure in the working chamber 17 becomes minimum only at the moment of striking the anvil 4 and the stop of the striker 2. After that, the valve 9 under the force setting of the spring 11 is lowered to the saddle 10 and the cycle repeats.

Speed control forward stroke of the valve 9 operates as follows. When reverse motion of the valve 9 damping fluid from the upper part of the cavity 25 of the annular piston 26 is squeezed and flows into the lower part of the chamber 25 through the channel 28 through a check valve 29 and partially through the orifice 30 and the channel 27. With the direct course of the valve 9 depreciation fluid from the bottom of the chamber 25 is extruded cushioning piston 26 and flows through the channel 27 only through the orifice 30 in the upper part of the chamber 25, as the shut-off valve 29 is closed. The flow rate of depreciation of fluid from the channel 27 channel 28 is regulated by the throttle 30. Thus, it is possible to set the time before landing valve 9 on the saddle 10 required to fully discharge the working fluid from the working chamber 5 of the shock of the node through the line 23 and the drain line 20.

The choice of specific values of the impact energy is produced before working machine (preliminary step) and depends on the size of the immersed pipe and soil conditions. Selected sacrilegio punch set, for example, using the two adjustment scale. The first scale, located on the housing of the control unit corresponds to a linear size of the compression setting of the spring, which regulate the impact energy within an interval. The second scale, located on the housing of the shock node corresponds to a linear size of the pre-compression of the working spring, which regulate the position of the maximum and minimum values of the interval. Scales are divided into divisions, indicated by numbers.

During the rotation of the adjusting screw 12 and the screw 6 pointers scales, mechanically connected respectively with the adjusting screw 12 and the screws 6 are moved along the first or second scale.

To set a given value of impact energy are one of the known ways (table, monograms and so on) match between the impact energy and the amount of pre-compression springs. Consider how linear compression springs for a given value of the impact energy, for example, using the table below.

In the table in the first row shows the sequence number of the first divisions of the scale, and in the first column is the sequence number of the second divisions of the scale (number of intervals). The impact energy is expressed in Joules and calculated by the formula (1) or (2).

For example, is required to establish the impact energy of 350 Joule. It corresponds to the third division at the first scale and the first point on the second scale. If the table does not have the desired impact energy, then use an interpolation method according to the first scale.

At the preliminary stage of operation of the machine is also installed, for example, the method of selection, the required speed of forward travel of the valve 9. For this purpose, initially the regulatory element of the throttle 30 is set at a position at which the cross-sectional area of orifice between the channels 27 and 28 maximum, and then bring the car in working condition. If during operation of the machine is not hit because of the premature landing valve 9 on the saddle 10 and the working fluid from the working chamber 5 does not have time to leave, the regulatory element of the throttle 30 is turned one revolution in the direction of decreasing cross-sectional area of orifice between the channels 27 and 28. Lead machine working condition and check whether the blow. The process is repeated until then, until it reaches the smooth operation of the machine. After a preliminary step of selecting the desired speed of forward travel of the valve 9 ends. The speed of movement of the valve 9 should be such that the time interval within which the landing valve 9 on the saddle 10, was sufficient for the full discharge of the working fluid from the cavity 5 percussion device is tion in the case drain line 20. Based on this condition sets the magnitude of the cross-sectional area of orifice between the channels 28 and 27 of the throttle 30.

Thus, in the present invention is provided to adjust the speed of the forward stroke of the valve so that the closing time of the valve was not less than the time of forward stroke of the striker, which allows to extend the control range of the impact energy of the hydraulic percussive machine and increase the reliability of its work.

1. The method of adjusting the impact energy of the hydraulic percussive machine comprising a change in a predetermined throttle value reverse drummer, interacting with the working of the elastic element and working fluid, and a smooth change in pressure of the working fluid, in which the switching stroke of the striker with the reverse in a straight line, by modifying the efforts of the pre-compression interacting with valve sets of the elastic element, the rigidity is much less than the rigidity of the work of the elastic element, characterized in that it further regulate the speed of forward travel of the valve so that the closing time of the valve was not less than the time of forward stroke of the striker.

2. The method of adjusting the impact energy of the hydraulic percussive machine according to claim 1, wherein the interval control value of the return stroke of the striker is meshaut towards smaller or larger values by a corresponding increase or decrease attached to the drummer of the efforts of the pre-compression of the working of the elastic element.

3. Adjustable hydraulic drum machine, drums containing the node and control the impact energy and impact site includes a casing in which is located the first working chamber, a drummer and a work of the elastic element, and a management tool impact energy is made in the form of a body placed in it the second working chamber and a valve communicating with the rod and defining an elastic element with a device to force changes its pre-compression, while the first and the second working chamber hydraulically connected, characterized in that the management tool impact energy is further provided with a speed regulator for forward travel of the valve, including hydraulically Autonomous depreciation camera with damping fluid is divided into upper and lower parts of the ring damping piston, which is located on the valve, while the upper and lower amortization camera connected via channels through a check valve and choke.



 

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