JP2013194843A - Pressure relief device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure relief device for automatically or manually relieving a pressure when a high pressure grout pump exceeds a predetermined pressure.SOLUTION: A pressure relief device is configured to relieve a pressure when a grout pump exceeds a predetermined pressure, and includes at least: a block element 14 including a cylinder part 12 communicating with a pressure relief passage 19 and a discharge hole 13; a valve member 15 which is shaped tubular, has a tapered portion in the middle, includes a packing part 15d in the end portion thereof and is disposed in the cylinder part 12; a safety pin 16 which is inserted into the valve member 15 and includes at both end portion sides missing part which are broken when receiving a predetermined pressure; a push-in bolt 17 of which one end portion 17a can push in the valve member 15 and the other end portion 17b is positioned while protruding from an upper portion of the block element 14. Both end portions (a) of the safety pin 16 are held between a lower portion of the block element 14 and an edge 23 of the pressure relief passage 19, and the valve member 15 is fixed temporarily.

Description

  The present invention is installed in communication with a pressure release passage connected to a discharge passage of a grout pump such as a high-pressure plunger pump, and automatically or manually pressurizes when the grout pump exceeds a predetermined pressure. The pressure release device for releasing

  Conventionally, when a grout pump such as a high pressure plunger pump used for construction such as drilling or ground improvement is being constructed, the nozzle of the high pressure hose may be clogged for some reason. At this time, since the high-pressure grout pump continues to supply grout, an abnormal pressure is applied to the discharge flow path.

  When this abnormal pressure is detected by the detecting device for the grout pump, the pump is stopped.

  Japanese Patent Application Laid-Open No. 11-257244 discloses a plunger pump pressure release mechanism that pumps cement milk or the like (see Patent Document 1).

No. 11-257244 (FIG. 4)

  However, even if the detecting device for the grout pump detects the abnormal pressure and stops driving the pump, the abnormal pressure remains in the grout discharge flow path.

  In this case, the residual pressure is released by cutting the tip of the high-pressure hose or removing the connecting portion of the high-pressure hose. However, since high-pressure cement milk or the like is ejected at the moment of cutting the high-pressure hose, it is extremely dangerous, and there is a problem that injury accidents may occur due to the sprayed cement milk.

  Therefore, in the case of the conventional example, when the nozzle of the high-pressure hose or the like is closed, there is a problem that must be solved to release the residual pressure safely and reliably.

  The gist of the present invention for solving the problems of the conventional example is that it is installed in communication with a pressure release passage connected to a discharge flow path of a grout pump, and automatically when the grout pump exceeds a predetermined pressure. Or a pressure release device for manually releasing pressure, the pressure release device comprising a block body having a cylinder portion communicating with the pressure release passage and a discharge hole, and a cylindrical shape and a taper portion in the middle A safety pin having a packing part at the end, a valve member disposed in the cylinder part, a safety pin that is inserted into the valve member and is broken at both end sides upon receiving a predetermined pressure, and one end At least a push bolt that is positioned so as to protrude from the upper part of the block body, and both ends of the safety pin are connected to the lower part of the block body and the pressure Open passage It is sandwiched between the edge portion, wherein the valve member is configured to be temporarily fixed.

In addition, when the residual pressure of the pressure release passage exceeds a predetermined pressure, the valve member is pressed and the missing portion of the safety pin is broken, or the push bolt is screwed into the one end portion. The valve member is forcibly pushed in and the broken portion of the safety pin is broken;
A guide member for preventing erroneous screwing of the push bolt is detachably provided on the other end side of the push bolt;
Is included.

  According to the depressurizing device of the present invention, when the nozzle of the high-pressure hose is clogged, the residual pressure can be safely and reliably released automatically or manually. Therefore, it is possible to prevent an accident in which cement milk is ejected and injured at the moment when the high-pressure hose is cut as in the conventional example.

  In addition, when the residual pressure in the pressure release passage exceeds a predetermined pressure, the valve member is pressed and the missing part of the safety pin is broken, or a push bolt is screwed to force the valve member at one end. It is said that the residual pressure can be released safely and reliably automatically or manually when the nozzle of the high pressure hose is clogged by being pushed in and breaking the broken part of the safety pin. Excellent effect.

  And, by providing a guide member for preventing the erroneous insertion of the push bolt at the other end side of the push bolt, it is possible to prevent the wrong push bolt from being screwed in. It has an excellent effect of not causing failure to release the road pressure.

It is a perspective view of the pressure release apparatus 11 which concerns on this invention. It is a longitudinal cross-sectional view of the front side of the pressure release apparatus 11 which concerns on this invention. It is the longitudinal cross-sectional view of the front side which isolate | separated and showed the valve member 15 of the pressure release apparatus 11 which concerns on this invention. It is the longitudinal cross-sectional view of the side surface which isolate | separated and showed the valve member 15 of the pressure release apparatus 11 which concerns on this invention. 3 is a front view of the valve member 15. FIG. 3 is a perspective view of a guide member 31. FIG. It is a front view of the state which installed the pressure release apparatus 11 in the housing 24. FIG. FIG. 3 is a longitudinal sectional view of the front side in a state where the pressure relief device 11 is installed in communication with the pressure release passage 19. It is a longitudinal cross-sectional view on the front side for explaining a state in which the pushing bolt 17 is screwed and the valve member 15 is forcibly pushed. It is a longitudinal cross-sectional view of the front side explaining the state where the missing portion 20 of the safety pin 16 of the valve member 15 is broken.

  Next, embodiments of the present invention will be described with reference to the drawings. First, in FIG. 1 to FIG. 4, reference numeral 11 denotes a pressure release device. The pressure release device 11 includes a block body 14 having a cylinder portion 12 and a discharge hole 13, and a valve member disposed in the cylinder portion 12. 15, a safety pin 16 inserted into the valve member 15, and a push bolt 17 capable of pushing the valve member 15.

  The depressurization device 11 is installed in communication with a pressure release passage 19 connected to a discharge flow path 18 of a grout pump (not shown), and automatically or manually pressurizes when the grout pump exceeds a predetermined pressure. Is a device for opening the door (see FIGS. 7 to 10).

  The block body 14 is formed of a steel material or the like, has an appropriate weight, and has a rectangular parallelepiped shape. 1 to 4, the block body 14 includes a cylinder portion 12 formed by opening the bottom portion 22, and a discharge hole formed by opening the side portion 29 a in communication with the cylinder portion 12. 13. At the upper part of the cylinder part 12, one end part 17a of the pushing bolt 17 is positioned so as to be able to protrude. The cylinder portion 12 communicates with the pressure release passage 19 (recessed portion 19b) (see FIGS. 8 to 10).

  A U-shaped holding member 26 is provided on the upper portion of the block body 14, and both end portions 26 a of the holding member 26 are fixed to side portions 29 b of the block body 14 with bolts 27. An opening 30 is provided at the center of the holding member 26, and the other end 17b side of the push bolt 17 is inserted through the opening 30 (see FIG. 1).

  As shown in FIG. 5, the valve member 15 has a cylindrical shape, is provided with an insertion hole 15 b through which the safety pin 16 is inserted in the side portion of the cylindrical portion 15 e, has a tapered portion 15 c in the middle, and is elastic at the lower end portion. A packing portion 15d is provided.

  The valve member 15 is disposed so that an upper portion thereof is fitted into the cylinder portion 12, and the valve member 15 is moved up in the cylinder portion 12 when a missing portion 20 of a safety pin 16 described later is cut. (See FIG. 10).

  As shown in FIG. 5, the safety pin 16 is formed in a rod shape having a predetermined length, and is inserted through the insertion hole 15 b of the valve member 15. Further, the safety pin 16 is formed with a small-diameter defect portion 20 that breaks when receiving a predetermined pressure on both end portions 16a side.

  And the both end parts 16a of the safety pin 16 are clamped between the bottom part 22 of the block body 14, and the edge part 23 of the pressure release channel | path 19 (recessed part 19b), and the valve member 15 is temporarily fixed. It is a structure (refer FIG.8 and FIG.9). At this time, the packing portion 15 d of the valve member 15 is configured to be in a pressure-bonded state to the hole portion 19 a of the pressure release passage 19.

  8 to 10 indicate a part of the casing in which the discharge flow path 18 is provided, and the block body 14 is fixed to the casing 24 with bolts 21. In the discharge channel 18, grout or cement milk flows at high pressure in the direction of the arrow. Reference numeral 19b denotes a concave portion that constitutes the end portion side of the pressure release passage 19 and communicates with the hole portion 19a, and the lower portion of the valve member 15 is disposed in the concave portion 19b. It has become. Furthermore, the code | symbol 28 shows the extraction port for taking out the clogged cement.

  The pushing bolt 17 is screwed vertically from the upper part of the block body 14, and when the pushing bolt 17 is screwed, the one end 17 a comes into contact with the upper part 15 a of the valve member 15 to force the valve member 15. Can be pushed into. Further, the other end 17 b side protrudes from the upper portion of the block body 14 and is inserted through the opening 30 of the holding member 26. The other end 17b is provided with a head 17c.

  On the other end 17 b side of the push bolt 17, a guide member 31 for preventing the push bolt 17 from being erroneously screwed is detachably provided. As shown in FIG. 6, the guide member 31 is formed in a substantially cylindrical shape, and a recess 31a is provided along the longitudinal direction thereof. The concave portion 31a is set along the shaft portion 17d of the push bolt 17 to prevent the push bolt from being erroneously screwed (see FIGS. 8 and 10).

  Next, a mechanism in which the pressure release device 11 having the above configuration automatically releases pressure will be described. First, a grout pump such as a high-pressure plunger pump normally operates at a pressure of about 420 to 430 kg.

  However, when the pressure of the high pressure hose is clogged, for example, when the pressure becomes about 480 kg or more, the pressure in the pressure release passage 19 increases and the valve member 15 is pressed upward at a high pressure. The defect portion 20 is configured to be broken. Thus, when the defect | deletion part 20 breaks, the valve member 15 will be pressed by high pressure, and will raise the cylinder part 12 instantly (refer FIG. 10), and the cement milk which spouts from the pressure release channel | path 19 (recessed part 19b), The pressure is released by ejecting from the discharge hole 13. Although not shown, a hose is connected to the discharge hole 13, and the jetted cement milk is discharged to a predetermined discharge place.

  A case where the pressure release device 11 is manually released will be described. When the nozzle of the high-pressure hose is clogged and the detecting device for the grout pump detects an abnormal pressure, the driving of the pump is stopped.

  At this time, when the pressure of the grouting pump is less than 480 kg, the defective portion 20 is not broken as described above. In this case, the pushing bolt 17 is rotated and screwed in, and the upper end 15a of the valve member 15 is pressed by the one end portion 17a to forcibly push the valve member 15 (see FIG. 9). 20 is broken.

  After the breakage portion 20 is broken in this manner, when the push bolt 17 is reversely rotated and loosened (raised), the valve member 15 is pushed and the cylinder portion 12 is raised (see FIG. 10), from the discharge hole 13. This is a mechanism in which cement milk is ejected and the pressure is released.

  The pressure release device 11 configured as described above can release the residual pressure automatically or manually when the nozzle of the high-pressure hose is clogged. This prevents accidents in which cement milk erupts at the moment the high-pressure hose is cut.

DESCRIPTION OF SYMBOLS 11 Pressure release apparatus 12 Cylinder part 13 Discharge hole 14 Block body 15 Valve member 15a Upper part 15b Insertion hole 15c Taper part 15d Packing part 15e Cylindrical part 16 Safety pin 16a End part 17 Push bolt 17a One end part 17b Other end part 17c Head part 17d Shaft portion 18 Discharge flow path 19 Pressure release passage 19a Hole portion 19b Recessed portion 20 Defect portion 21 Bolt 22 Bottom portion 23 Edge portion 24 Housing 26 Holding member 26a End portion 27 Bolt 28 Extraction port 29a, 29b Side portion 30 Opening portion 31 Guide member 31a recess

Claims (3)

This is a pressure release device that is installed in communication with the pressure release passage connected to the discharge flow path of the grout pump and automatically or manually releases the pressure when the grout pump exceeds a predetermined pressure. And
The depressurizing device is
A block body including a cylinder portion communicating with the pressure release passage and a discharge hole;
A valve member disposed in the cylinder portion, having a cylindrical shape with a tapered portion in the middle, a packing portion at the end, and
A safety pin that is inserted into the valve member and has a deficient portion on both end sides that breaks when subjected to a predetermined pressure; and
One end portion is capable of pushing the valve member, and the other end portion is provided with at least a push bolt positioned protruding from the upper portion of the block body,
Both ends of the safety pin are sandwiched between a lower part of the block body and an edge of the pressure release passage, and the valve member is temporarily fixed. When the residual pressure in the pressure release passage exceeds a predetermined pressure, the valve member is pressed and the missing portion of the safety pin is broken, or the push bolt is screwed in and the one end portion The depressurization device according to claim 1, wherein the pressure member is configured to forcibly push in the valve member to break the missing portion of the safety pin. The pressure release device according to claim 1, wherein a guide member for preventing erroneous screwing of the push bolt is detachably provided on the other end portion side of the push bolt.

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