KR200398384Y1 - piston concrete pump - Google Patents

Abstract

3-4 piston concrete pump according to the present invention, the hopper 10 provided with a transfer pipe 12 on one side; Two discharge cylinders 20 and 20 ′ disposed on the other side of the hopper 10 to pump the raw concrete supplied to the hopper 10; Two drive cylinders 21 and 21 ', each connected to each of the discharge cylinders 20 and 20'; The main part 501 of which the front part is rotatably connected to the transfer pipe 12 in the hopper 10 and the auxiliary pipe part 503 which is formed at the rear part of the main pipe part 501 and protrudes outside the hopper 10. And a branch pipe part 502 branched from one side of the main pipe part 501, and the branch pipe part 502 and both discharge cylinders 20 by swinging left and right with the main pipe part 501 as a rotation axis. An SIS valve 50 to which 20 'is alternately connected; In communication with the auxiliary pipe part 503 of the SSS valve 50, a part of the concrete transferred from the branch pipe part 502 to the main pipe part 501 during the extrusion operation of the discharge cylinder (20, 20 ') is sucked. The auxiliary cylinder 60 for removing the pulsation phenomenon caused by the pumping operation disconnection between both the discharge cylinders 20 and 20 'by extruding the concrete into the main pipe part 501 at the operation switching timing of the discharge cylinders 20 and 20'. ); A shift hinge 42 connected to the auxiliary pipe part 503 of the ES valve 50 at the rear of the hopper 10, and the TS valve 50 connected to the shift hinge 42 to left and right. It comprises a swing mechanism consisting of a left and right shift cylinder 40 to rotate.

According to the piston-type concrete pump according to the present invention configured as described above it is possible to prevent the pulsation phenomenon caused by the discontinuation of the concrete by continuously discharging the concrete even when the operation between the two discharge cylinder switching.

Therefore, even when a long transport boom is used to build a high-rise building, the transport boom is not shaken, thereby enabling safe and efficient concrete pouring.

Description

Piston concrete pump

The present invention relates to a piston concrete pump, and more particularly to a piston concrete pump that improves the work stability according to the concrete pumping by preventing the pulsation phenomenon occurring during the stroke conversion between each piston.

The concrete pump used to transfer the raw concrete transferred by the mixer truck to the placing position is roughly divided into a squeeze method and a piston method according to its operation structure. The squeeze type concrete pump is composed of a conveying tube and a compression roller for pressing the concrete. The concrete is discharged and conveyed by squeezing and squeezing the conveying tube with a pressing roller.

The squeeze-type concrete pump has a characteristic of high stability during pumping operation because of less pulsation phenomenon unlike the piston method described below, but the discharge pressure can be increased because the conveying tube is made of a soft material such as rubber. There is a disadvantage that it is difficult to transfer to a high place, and the maintenance cost is high because the tube is easily worn and broken.

Piston type concrete pump discharges concrete by inhaling concrete into cylinder and reciprocating piston. It is commonly referred to as 2-way-2 stroke structure (2-2 type piston concrete pump) which forms two strokes using two cylinders. )

As shown in FIG. 1, the conventional 2-2 piston concrete pump includes a hopper 10 that receives raw concrete discharged from a mixer truck and stirs, and the raw concrete that is supplied and disposed on one side of the hopper 10. To the first and second discharge cylinders 20 and 20 'for pumping by mutually opposite reciprocating motions, and drive cylinders 21 and 21' respectively connected to rear portions of the discharge cylinders 20 and 20 '. And S-valve 30 swinging from side to side to alternately communicate with both of the discharge cylinders 20 and 20 'to form a discharge passage connected to the transfer pipe 12. It includes a left and right shift cylinder 40, 40 'for swinging the s-valve 30 to the left and right at the back of the hopper 10.

The discharge cylinders 20, 20 'and the drive cylinders 21, 21' are provided with pistons 22, 22 'for reciprocating back and forth by hydraulic pressure. Rod spools 221, 221 'and piston spools 222, 222' are formed at the front and rear ends of the '), and the space between the rod spool and the piston spool is provided on the side of the drive cylinders 21, 21'. Hydraulic piping for applying hydraulic pressure is connected, and the rear ends of the drive cylinders 21 and 21 'are also connected to each other by hydraulic piping.

Both the discharge cylinders 20, 20 'and the drive cylinders 21, 21' are connected with a water box 24 for cooling and washing the rod spools 221, 221 'during concrete discharge. The pistons 22 and 22 'operated in both cylinders have rod spools 221 and 221' disposed on the discharge cylinders 20 and 20 ', and piston spools 222 and 222'. The drive cylinders 21 and 21 'are mounted in such a structure.

As shown in FIG. 2, the S-valve 30 has a main pipe part 301 bent in an S-shape, a rotation shaft part 302 formed on one side of the main pipe part 301, and a rear end of the rotation shaft part 302. The formed spline part 303 and the screw part 304 are comprised.

The S valve 30, the front end of the main pipe portion 301 is connected to the transfer pipe 30, the rotating shaft portion 302 is mounted in a structure projecting to the rear of the hopper 10, the main pipe portion ( A wear plate 32 is attached to the rear end of the 301 to prevent direct friction with the inner surface of the hopper 10.

A shift hinge 42 is splined to the spline portion 303 of the S-valve 30 and a fastening nut (not shown) is mounted on the screw portion 304 to prevent the shift hinge 42 from being separated. The hinge 42 is connected to the left and right shift cylinders 40 and 40 ′ for the swing operation of the S valve 30.

Operation of the conventional 2-2 method piston concrete pump of this structure is as follows.

First, in the first discharge cylinder 20 connected with the S valve 30, the concrete is discharged to the transfer pipe 12 through the discharge operation of which the piston 22 moves forward, and at the same time, the second discharge cylinder having the discharge port opened ( 20 ') the concrete is sucked into the interior through the suction operation in which the piston 22' reverses.

Subsequently, after the discharge operation of the first discharge cylinder 20 is completed, the S-valve 30 swings by the one-side shift cylinder 40 to connect the second discharge cylinder 20 'and the transfer pipe 12. At the same time, the outlet of the first discharge cylinder 20 is opened.

Then, the concrete is sucked through the suction operation in the first discharge cylinder 20 and discharged in the second discharge cylinder 20 'to pressurize the concrete to the transfer pipe 12.

That is, according to the conventional 2-2 type piston concrete pump, each of the discharge cylinders 20 and 20 'is discharged and sucked to perform two stroke movements of the suction stroke and the discharge stroke, and at the same time, the S valve 30 swings. By alternately connecting the respective discharge cylinders 20, 20 'and the transfer pipe 12 is to transfer the concrete in the hopper 10 through the transfer pipe (12).

On the other hand, according to the prior art, since both discharge cylinders 20 and 20 'simultaneously perform opposite strokes at the same time, as shown in FIG. 3, during the swing operation of the S valve 30 (operation switching of each cylinder). At this point, the transfer of concrete is interrupted, causing a pulsation phenomenon, and a transfer boom (not shown) to which the transfer pipe 12 is long is irregularly shaken by the pulsation phenomenon.

The phenomenon that the transfer boom shakes due to pulsation becomes worse as the transfer boom is longer. Therefore, when the conventional 2-2 type piston concrete pump is used for the construction of a high-rise building, the stability of the casting boom is greatly reduced. Deterioration, there is a problem that the efficiency of the concrete placing work is lowered because the movement of the transfer boom is not easy during pumping.

The present invention was devised to solve the above-mentioned conventional problems, and provides a three-way-4 stroke (aka 3-4 method) piston concrete pump to improve the safety and efficiency during concrete placing work by preventing pulsation from occurring. For the purpose.

3-4 piston concrete pump provided to achieve the above object, the hopper provided with a transfer pipe on one side; Two discharge cylinders disposed on the other side of the hopper to pump the raw concrete supplied to the hopper; Two drive cylinders each connected to each of the discharge cylinders; Its main part is composed of a main pipe part rotatably connected to the transfer pipe in the hopper, an auxiliary pipe part formed at the rear part of the main pipe part to protrude out of the hopper, and a branch pipe part branched from one side of the main pipe part. An SIS valve in which the branch pipe part and both the discharge cylinders are alternately connected by swinging left and right by the main pipe part as a rotation axis; It communicates with the auxiliary pipe of the S-S valve and sucks a part of the concrete transferred from the branch pipe to the main pipe during the extrusion operation of the discharge cylinder, and extrudes the concrete into the main pipe at the timing of switching the operation of the discharge cylinder. An auxiliary cylinder for removing pulsation caused by disconnection of the pumping operation; It comprises a swing mechanism consisting of a shift hinge connected to the auxiliary pipe portion of the ES valve at the rear of the hopper, and a left and right shift cylinder connected to the shift hinge to rotate the IS valve to the left and right.

Here, the ES valve, the spline portion for spline coupling of the shift hinge is formed at the rear end of the auxiliary pipe portion and has a structure in which a screw portion for fastening the fastening nut is formed after the spline portion.

In addition, the auxiliary cylinder is in communication with the auxiliary pipe portion of the S-S valve, the piston reciprocating in the auxiliary cylinder is formed in the form of the rod spool and the piston spool is formed in the front and rear end, the auxiliary cylinder in front of the piston spool between the It is characterized in that the hydraulic pipe and the rear hydraulic pipe is connected.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 9.

3-4 piston concrete pump according to an embodiment of the present invention, the hopper 10 is attached to the transfer pipe 12 on one side, as shown in Figure 4, the first disposed on the other side of the hopper 10 And the second discharge cylinders 20 and 20 ', the two drive cylinders 21 and 21' connected to each of the two discharge cylinders 20 and 20 'and the hopper 10 are disposed in a swing operation. ) SIS-valve (50) for alternately connecting the transfer pipe (12), a swing mechanism for swinging the SIS valve (50), the both discharge cylinder (20) (20 It includes the auxiliary cylinder 60 for removing the pulsation phenomenon due to the administrative transition between ').

Here, as in the prior art, the rear ends of the respective drive cylinders 21 and 21 'are connected to each other by hydraulic piping, and the hydraulic pressure for the operation of the piston 22 is also applied to the side surfaces of the respective drive cylinders 21 and 21'. The hydraulic piping is connected so that it is applied.

A rod spool 221 and a piston spool 222 are formed at the front and rear ends of the piston 20, and the hydraulic pipe connected to the side of the drive cylinder 21 is disposed in the space between the rod spool 221 and the piston spool 222. Connected.

As shown in FIGS. 5 and 6, the SIS valve 50 is formed on the main pipe part 501 rotatably connected to the feed pipe 12 and the rear side of the main pipe part 501 to the outside of the hopper 10. The auxiliary pipe part 503 protrudes and has a diameter smaller than that of the main pipe part 501 and the branch pipe part 502 branched from one side of the main pipe part 501.

A spline portion 504 and a screw portion 505 are sequentially formed at the rear end of the auxiliary pipe portion 503, and a wear plate 52 at the tip of the branch pipe portion 502 to prevent direct friction with the inner surface of the hopper 10. ) Is attached.

The swing mechanism includes a shift hinge 42 which is splined to the spline portion 504 of the SIS valve 50 and a left and right shift cylinder which is connected to the shift hinge 42 to rotate the SIS valve 50 from side to side. 40 and 40 '.

The shift hinge 42 is mounted in a structure in which the shift hinge 42 is prevented from being separated by a fastening nut (not shown) fastened to the threaded portion 505 while being coupled to the spline portion 504 of the SIS valve 50.

In addition, the auxiliary cylinder 60 communicates with the rear end of the auxiliary pipe part 503 of the SIS valve 50 from the outside of the hopper 10, and the auxiliary cylinder 60 has an auxiliary pipe part 503 whose tip is a predetermined length. Inserted into the

The piston 62 of the auxiliary cylinder 60 has a rod spool 621 and a piston spool 622 formed at the front and rear ends thereof, and a piston spool 622 is formed at one side of the auxiliary cylinder 60. The front hydraulic pipe and the rear hydraulic pipe are connected to each other. Here, the front and rear hydraulic piping is made of a hydraulic hose to enable the rotation operation of the auxiliary cylinder (60).

In addition, according to the present embodiment, the two discharge cylinders 20, 20 ', the auxiliary cylinder 60 and the shift cylinders 40, 40' by the hydraulic pressure applied through a hydraulic pipe from a plurality of hydraulic pumps In operation, a plurality of switching valves (see FIG. 9) are installed on the hydraulic pipe to control the operation of each cylinder by intermitting the hydraulic pressure supplied to each cylinder from the hydraulic pump.

3-4 piston piston pump according to an embodiment of the present invention configured as described above takes a four-stroke mode in the structure of the operation of the two discharge cylinder 20, 20 'and the auxiliary cylinder 60, each stroke The operation of the poem is as follows.

First, in the first stroke, as shown in FIG. 7A, the first discharge cylinder 20 is discharged in a state in which the branch pipe part 502 of the SIS valve 50 communicates with the first discharge cylinder 20 (the piston moves forward. By moving to the top dead center, the concrete is pressurized to the conveying pipe 12 side through the SIS valve 50 (when a thick arrow in the drawing), on the contrary, the second discharge cylinder 20 ' By moving to the bottom dead center, the concrete in the hopper 10 is sucked. In this case, the auxiliary cylinder 60 sucks a part of the concrete discharged from the first discharge cylinder 20.

Subsequently, in two strokes, as shown in FIG. 7B, the piston 22 of the first discharge cylinder 20 reaches the top dead center, and the discharge operation stops, and the piston 22 'of the second discharge cylinder 20' In the state where the suction operation is also stopped by reaching the bottom dead center, the discharge operation of the auxiliary cylinder 60 proceeds.

At this time, the discharge operation of the auxiliary cylinder 60 is started just before the discharge operation of the first discharge cylinder 20 is stopped and continues until immediately after the discharge operation of the second discharge cylinder 20 'is started, thereby causing both discharge cylinders 20 to be discharged. Even when the operation is switched between 20 ', the supply of concrete is continuously supplied to the transfer pipe 12 without interruption.

In addition, while the discharge operation of the auxiliary cylinder 60 is in progress, the SIS valve 50 swings so that the branch pipe part 502 communicates with the second discharge cylinder 20 '.

In the third stroke, as shown in FIG. 7C, the discharge operation of the second discharge cylinder 20 ′ is performed while the branch pipe part 502 of the SIS valve 50 is in communication with the second discharge cylinder 20 ′. The discharge cylinder 20 performs a suction operation. In addition, the auxiliary cylinder 60 sucks a part of the concrete discharged from the second discharge cylinder 20 'by performing a suction operation.

In the fourth stroke, as shown in FIG. 7D, the discharge operation of the second discharge cylinder 20 ′ is stopped and the discharge operation is performed by the auxiliary cylinder 60 while the suction operation of the first discharge cylinder 20 is stopped. In this case, as in the second stroke, the discharge operation of the auxiliary cylinder 60 starts immediately before the discharge operation of the second discharge cylinder 20 'is stopped and continues until immediately after the discharge operation of the first discharge cylinder 20 starts. Concrete is continuously discharged even when switching operation between both discharge cylinders 20 and 20 '.

That is, according to the present embodiment as described above by the discharge operation is performed by the auxiliary cylinder 60 in accordance with the operation switching timing of both discharge cylinders (20, 20 ') by the concrete through the transfer pipe 12 Since it is conveyed, the pulsation phenomenon like the conventional one does not occur (see FIG. 8).

On the other hand, in the present embodiment as described above, the hydraulic direction formed during the operation of both the drive cylinders 21, 21 ', the auxiliary cylinder 60, the shift cylinders 40, 40' and the operation of each switching valve. A description with reference to FIG. 9 is as follows.

First, the hydraulic pressure generated from the second hydraulic pump 72 is applied to the one side shift cylinder 40 through the PA port of the first switching valve V1 through the hydraulic pipe L1, and the shift cylinder 40 of the By operation, the SIS valve 50 swings and communicates with the second drive cylinder 21 '.

At the same time, when the second switching valve V2 is switched by the hydraulic pressure applied through the hydraulic pipe L2, the hydraulic pressure generated by the first hydraulic pump 70 is transferred to the second switching valve V2 through the hydraulic pipe L3. It is applied to the rod side (between the rod spool and the piston spool) of the first drive cylinder 21 via the BT port so that the piston 22 moves backward (moves to the bottom dead center side).

 Therefore, the first discharge cylinder 20 performs a suction operation, and at the same time, the piston side hydraulic pressure (hydraulic applied from the rear of the piston spool) of the first drive cylinder 21 passes through the hydraulic pipe L4 to the second drive cylinder 21 '. Is applied to the piston side (behind the piston spool), the second discharge cylinder 20 'is discharged and the rod side hydraulic pressure (hydraulic formed between the rod spool and the piston pool) of the second drive cylinder 21'. Is returned to the oil tank 74 via the hydraulic pipe L4 '.

In addition, when the rod side hydraulic pressure of the first drive cylinder 21 is applied through the hydraulic pipe L5 to switch the third switching valve V3, the piston side hydraulic pressure of the second drive cylinder 21 'becomes the hydraulic pipe L5. ') Through the PB port of the third switching valve (V3) to switch the fourth switching valve (V4), the hydraulic pressure generated in the second hydraulic pump 72 is the fourth switching valve through the hydraulic pipe (L6) Passed through the P ₁ -A port of (V4) to the piston side (piston spool rear) of the auxiliary cylinder 60, the auxiliary cylinder 60 is discharged operation and the rod side (piston spool) of the auxiliary cylinder 60 And hydraulic pressure formed between the rod and the spool are returned to the oil tank via the hydraulic pipe L6 '.

Subsequently, immediately before the discharge operation of the second discharge cylinder 20 'is finished, the hydraulic pressure of the piston side of the second drive cylinder 21' is transmitted through the hydraulic pipe L7 to open the check valve C2. The hydraulic pressure waiting in the rod side of the drive cylinder 21 is transmitted through the hydraulic pipe L8, and the 1st switching valve V1 is switched. At this time, the hydraulic pressure of the hydraulic pipe (L8 ') is returned to the oil tank through the check valve (C2) through the hydraulic pipe (L4').

Then, the hydraulic pressure generated in the second hydraulic pump 72 passes through the PB port of the first switching valve V1 through the hydraulic pipe L1 and enters the hydraulic pipe L1 'to the second shift cylinder 40'. By being applied, the SIS valve 50 swings and communicates with the first discharge cylinder 20. Thus, the auxiliary cylinder starts from the suction operation of the first discharge cylinder 20 and the discharge operation of the second discharge cylinder 20 '. The concrete is continuously discharged by repeating the one-cycle four-stroke operation until the discharge operation of (60).

As described above, according to the 3-4 method piston concrete pump according to the present invention, it is possible to prevent the pulsation phenomenon caused by discontinuing the concrete by continuously discharging the concrete even when the operation between the discharge cylinder switching.

Therefore, even when a long transport boom is used to build a high-rise building, the transport boom is not shaken, thereby enabling safe and efficient concrete pouring.

1 is a perspective view showing the structure of a 2-2 type piston concrete pump according to the prior art.

Figure 2 is a cross-sectional view showing the structure of the S-valve applied to the 2-2 method piston concrete pump according to the prior art.

Figure 3 is a graph showing the operation cycle of the 2-2 method piston concrete pump according to the prior art.

Figure 4 is a perspective view showing the structure of a 3-4 type piston concrete pump according to an embodiment of the present invention.

Figure 5 is a perspective view showing the structure of the TS valve applied to the 3-4 piston piston concrete pump according to an embodiment of the present invention.

Figure 6 is a cross-sectional view showing the structure of the ES valve applied to the 3-4 piston piston concrete pump according to an embodiment of the present invention.

7A, 7B, 7C, and 7D are state diagrams showing operating states of respective strokes of the 3-4 piston concrete pump according to the present embodiment.

8 is a graph showing the operating cycle of the 3-4 piston concrete pump according to the embodiment.

9 is a hydraulic circuit diagram of the 3-4 piston concrete pump according to the present embodiment.

<Explanation of symbols for the main parts of the drawings>

10: hopper 12: transfer pipe

20, 20 ': discharge cylinder 21, 21': drive cylinder

40, 40 ': Shift cylinder 50: SIS valve

501: main pipe portion 502: branch pipe portion

503: auxiliary pipe 60: auxiliary cylinder

Claims (3)

Hopper provided with a transfer pipe on one side; Two discharge cylinders disposed on the other side of the hopper to pump the raw concrete supplied to the hopper; Two drive cylinders each connected to each of the discharge cylinders; Its main part is composed of a main pipe part rotatably connected to the transfer pipe in the hopper, an auxiliary pipe part formed at the rear part of the main pipe part to protrude out of the hopper, and a branch pipe part branched from one side of the main pipe part. An SIS valve in which the branch pipe part and both the discharge cylinders are alternately connected by swinging left and right by the main pipe part as a rotation axis; It communicates with the auxiliary pipe of the S-S valve and sucks a part of the concrete transferred from the branch pipe to the main pipe during the extrusion operation of the discharge cylinder, and extrudes the concrete into the main pipe at the timing of switching the operation of the discharge cylinder. An auxiliary cylinder for removing pulsation caused by disconnection of the pumping operation; A piston concrete pump including a swing mechanism comprising a left and right shift cylinder connected to the auxiliary pipe of the NS valve in the rear of the hopper and the left and right shift cylinder connected to the shift hinge. According to claim 1, wherein the SS valve is A spline part is formed at the rear end of the auxiliary pipe part for spline coupling of the shift hinge. Structure formed with a screw for fastening the fastening nut subsequent to the spline portion Piston concrete pump, characterized in that consisting of. The method of claim 1, The auxiliary cylinder is in communication with the auxiliary pipe of the SL valve, The piston reciprocating in the auxiliary cylinder has a form consisting of a piston spool and a rod spool at the front and rear ends, Piston concrete pump, characterized in that the auxiliary cylinder is connected to the front hydraulic pipe and the rear hydraulic pipe with a piston spool in between.