JPH0661390U - Hydraulic pump integrated squeeze off tool - Google Patents

Abstract

(57) [Abstract] [Purpose] Excellent workability, operability, convenience, labor saving, and pipes of various shapes and sizes can be safely and reliably compressed by a single tool. To provide a squeeze-off tool integrated with a hydraulic pump that can close the valve. [Structure] A cylinder mechanism part 3 is rotatably connected to a hydraulic pump part 2, an inverted U-shaped head part 4 is connected to the tip end side thereof, and a fixed squeeze bar 5 is fixed to the head part 4 to face it. The movable squeeze bar 6 attached to the piston 44 of the cylinder mechanism 3 is provided with a step-like stopper 8 and a movable squeeze bar 6 which can be rotated corresponding to the pipe body to be selected to select a desired stop surface. A lock mechanism portion 9 that is fixed to the compressed thickness position is provided, and the tube body 10 is held at a predetermined position by the guide mechanism portion 7. By operating the hydraulic pump 2, the tubular body 10 is compressed by being sandwiched between the fixed squeeze bar 5 and the movable squeeze bar 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a squeeze-off tool for temporarily compressing and crushing a tubular body such as a gas pipe made of an elastic body such as a polyethylene pipe to crush the fluid such as gas. Squeeze-off tool integrated with a hydraulic pump that is specially provided.

[0002]

[Prior art]

 When a part of the pipe body such as a gas pipe that requires repair occurs, a temporary fluid shutoff work is performed in which the squeeze-off tool compresses the front and rear of the above-mentioned place. In this case, it is necessary to ensure that the fluid is shut off, the tube is not collapsed more than necessary, and the compressed tube can be completely restored after the tube is repaired. There are various types of such squeeze-off tools, but the pipe body is sandwiched between squeeze bars made of steel rods or steel pipes, and the movable squeeze bar is fixed to the screw shaft. A squeeze tool and a hydraulic pump, such as a vise-like manual squeeze-off tool for screwing and compressing with a manual handle, and a "squeeze tool for resin pipes" disclosed in Japanese Utility Model Publication No. 63-25429. As a separate body, a hydraulic squeeze tool is used to work by connecting a hydraulic pump to the squeeze bar on the movable side each time at the work site.

[0003]

[Problems to be solved by the device]

 However, the manual squeeze-off tool requires an extremely large amount of labor to move the movable squeeze bar manually. That is, although the tubular body is formed of an elastic body, it has relatively high rigidity and requires a large force to completely block the fluid. Therefore, the manual type requires the labor as described above and has a problem that the workability is poor. Further, the one disclosed in Japanese Utility Model Publication No. 63-25429 has a hydraulic pump as a separate body, and holds the squeeze-off tool and operates the pump to monitor the compression of the pipe body and the prevention of compression return. Two workers are required for this, and in the case of squeeze work of the buried pipe, there is a problem that the convenience and workability are particularly poor.

The present invention solves the above-mentioned problems, has good workability and operability, saves labor, and is applied to pipes of various sizes to ensure reliable compression and maintenance of a compression closed state. An object is to provide a squeeze-off tool integrated with a hydraulic pump.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises a hydraulic pump part and a head part connected to the hydraulic pump part through a cylinder mechanism part, and the head part is a fixed part for supporting a tubular body to be compressed. It has a squeeze bar, a movable squeeze bar that is connected to the cylinder mechanism section, a guide mechanism section that holds the tubular body at a predetermined position, and a stopper that controls the compressed thickness of the tubular body, and the stopper is the A hydraulic pump integrated squeeze that is rotatably supported by a movable squeeze bar, is disposed at a position facing the fixed squeeze bar, and has a plurality of steps formed in the direction of movement thereof. An off-tool, a hydraulic pump-integrated squeeze-off tool in which the head section has a lock mechanism section for maintaining the movable squeeze bar at the compressed thickness position of the pipe body, and further, the head section. It said to be rotatable about the axial direction of the hydraulic pump unit, and is also of the proposed hydraulic pump integrated squeeze off tool turnably configuration in the vertical axis direction.

[0006]

[Action]

 The head portion is put on the pipe body that needs to be compressed and closed, and the pipe body is guided and held by the guide mechanism portion, and the pipe body is inserted and positioned between the fixed squeeze bar and the movable squeeze bar. The hydraulic pump is operated, the movable squeeze bar is moved to the fixed squeeze bar side by the cylinder mechanism, and the pipe body is sandwiched between both squeeze bars. Continue hydraulic pumping and move the movable squeeze bar forward until the stopper contacts the fixed squeeze bar. The movable squeeze bar is held by the lock mechanism at the forward end. In order to return the pipe to the original state, after releasing the lock mechanism part, the pressing force by the hydraulic pump is removed, and the pipe is naturally returned by the elastic force.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings with respect to an embodiment using a squeeze-off tool for compressing a polyethylene pipe to block a gas flow. 1 is a partial vertical cross-sectional view showing the overall schematic structure of this embodiment, FIG. 2 is a perspective view showing one embodiment of a stopper, and FIGS. 3 and 4 are separated vertical cross-sectional views showing the detailed structure of this embodiment. 5 and 6 are sectional views of the separated horizontal surface of the present embodiment, and FIGS. 7 and 8 are side views of explanatory parts for explaining the compression operation according to the present embodiment.

As shown in FIG. 1, the hydraulic pump integrated squeeze-off tool 1 of the present embodiment is roughly composed of a hydraulic pump portion 2, a cylinder mechanism portion 3, a head portion 4 and the like. The head portion 4 has a fixed squeeze bar 5, a movable squeeze bar 6 connected to the cylinder mechanism portion 3, a guide mechanism portion 7 that holds a tubular body 10 made of polyethylene pipe, and a single structure is shown in FIG. A stopper 8 and a lock mechanism 9 for holding the movable squeeze bar 6 in a predetermined position are provided.

First, the hydraulic pump unit 2 will be described mainly with reference to FIGS. 4 and 6. An oil tank 12 in which hydraulic oil is stored is installed in the elongated fixed handle 11, and the oil tank 12 is fixed to a body 14 by an O-ring 15. A grip 13 for gripping is inserted in the rear end side of the fixed handle 11, and the front end side is connected to the body 14 by screwing means. A ram chamber 16 for accommodating the ram 16A is provided substantially in the center of the body 14 along the vertical direction in the drawing, and a pressure handle 17 is pin-connected to the ram 16A. A joint 18 is screwed to the body 14, and a cylinder head 19 that is rotatably screwed is connected to the joint 18. As shown in FIG. 6, an oil chamber 20 and an oil passage 21 connected to the oil chamber 20 are formed in the cylinder head 19. In the body 14, as shown in FIG. 4, a suction valve 22 formed of a ball and a spring that connects the ram chamber 16 side and the oil tank 12 side, and a ball that connects the ram chamber 16 and the oil chamber 20 side. A discharge valve 23 including a spring and a spring is provided. On the other hand, as shown in FIG. 6, a return valve 24 also serving as an oil passage is provided in the body 14 along a direction orthogonal to the ram chamber 16, and a ball valve 25, a pressing pin 26 and the like are incorporated therein. An oil passage 27 and an oil passage 28 are provided between the return valve 24 and the oil tank 12 and between the oil chamber 20. Further, as shown in FIG. 6, a relief valve 30 is provided between the oil passage 29 communicating with the ram chamber 16 and the oil tank 12. A return lever 31 is connected to the pressing pin 26. On the other hand, in the joint 18, as shown in FIG. 4, a pair of set screws 32 are provided so as to face each other, and a pair of grooved pins 33 (FIG. 6) are provided on the cylinder head 19 side so as to be able to contact the set screws 32. Is driven into. With the above structure, the cylinder head 19 can be rotated about 180 ° in the forward and reverse directions until the grooved pin 33 contacts the set screw 32.

When the pressure handle 17 is swung, the ram 16A moves up and down. As a result, the hydraulic oil in the oil tank 12 is sucked into the ram chamber 16 by the suction valve 22 and sent to the oil chamber 20, the oil passage 21 and the cylinder chamber 39 side of the cylinder head 19 via the discharge valve 23. On the other hand, when the return lever 31 is pushed and the push pin 26 is moved downward to open the ball 25 of the return valve 24, the hydraulic oil in the oil chamber 20 of the cylinder head 19 passes from the oil passage 28 to the return valve 24 portion. Then, it is returned to the oil tank 12 side through the oil passage 27. When the pressure of the hydraulic oil sent from the ram chamber 16 to the oil chamber 20 in the cylinder head 19 and the cylinder chamber 39 rises above a specified value, the relief valve 30 circulates the hydraulic oil to the oil tank 12 side. Prevent it from rising above the specified pressure.

Next, the cylinder mechanism portion 3 will be described with reference to FIGS. 3 and 5. A tongue portion 36 of an outer cylinder 35 is rotatably fitted and connected to a fitting groove 34 formed between the projecting portions 19a and 19a of the cylinder head 19. The joint pin 37 penetrates the protrusions 19a and 19a and the tongue 36, and pin-connects the both. An oil passage 38 is formed in the joint pin 37, and the oil passage 38 communicates with the oil passage 21 on the cylinder head 19 side and also communicates with the oil passage 40 communicating with the cylinder chamber 39 side of the outer cylinder 35. On the other hand, a plurality of (five in the figure) pin holes 41 are recessed in the tongue portion 36. The tip end portion 42a of the positioning pin 42 attached to the protruding portion 19a is adapted to fit in the pin hole 41 by a spring action so that the tip portion 42a can be retracted. With the structure described above, the outer cylinder 35 rotates about the joint pin 37 in a state where the oil chamber 20 and the cylinder chamber 39 are in communication with each other, and the rotation position is the fitting position of the positioning pin 42 and the pin hole 41. Specified by. A rear end of the inner cylinder 43 is screwed to the outer cylinder 35, and a piston 44 having an insertion hole 45 therein is slidably accommodated in the inner cylinder 43 along the axial direction. A return spring 46 is inserted into the insertion hole 45, the rear end side of the return spring 46 is hooked on a spring hook 47 fixed to the inner cylinder 43 side, and the tip end side is a piston at the end face on the tip side of the insertion hole. It is held by a bolt 48 fixed to 44.

Next, the head unit 4 will be described with reference to FIGS. 1, 3 and 5. A substantially U-shaped head 49 is screwed onto the tip end side of the inner cylinder 43. A fixed squeeze bar 5 having a substantially half-moon-shaped cross section, which serves as a reference support point for the tubular body 10, is fixed to the inner surface of the tip portion of the head 49. On the other hand, a movable squeeze bar 6 having a substantially half-moon shape in cross section is fixed to the tip end side of the piston 44 penetrating the head 49 so as to face the fixed squeeze bar 5. A pair of left and right guide plates 50 are fixed to the upper portion of the movable squeeze bar 6 with bolts 51. The guide plate 50 abuts and engages with the guide surface 52 of the head 49 to prevent the movable squeeze bar 6 from rotating in the circumferential direction so that the movable squeeze bar 6 can be smoothly moved back and forth.

The guide mechanism portion 7 is fixed to the head 49 with bolts 53, and has a pair of guides 54, 54 extending in opposite directions along the axial direction of the tubular body 10. A pair of guide plates 56, 56 which are fixed to each other and extend along the radial direction of the pipe body 10 (the moving direction of the piston 44), and an L-shaped one. The L-shaped guide plates 57, 57 are arranged alongside each other and are bent at the other end in a direction orthogonal to the one surface side. A long hole 58 is formed in the L-shaped guide plate 57 along the moving direction of the piston 44, and a thumb screw 68 inserted in the long hole 58 allows the left and right to be moved at a predetermined position corresponding to the diameter of the tubular body 10. It is fixed to the guide plate 56 side. During the compression work, the tube body 10 is held by the fixed squeeze bar 5, the guide plate 56 and the L-shaped guide plate 57 as shown in FIGS. By moving the L-shaped guide plate 57 along the long hole 58 depending on the diameter of the pipe body 10, the pipe body 10 is always housed in the head portion 4 in a three-point support type.

Next, the stopper 8 will be described mainly with reference to FIGS. As shown in FIG. 3, the stopper 8 is attached by a support shaft 59 to the movable squeeze bar 6 at the upper and lower positions in the figure, and is supported rotatably around the support shaft 59. As shown in FIG. 2, a plurality of step portions 61 (three positions in the drawing) are formed on the surface opposite to the mounting surface 60. Each step portion 61a from the mounting surface 60, 61b, height to 61c are a _1, a _2, a ₃ in their respective phases cradling to display, the size of such This is crushed thickness of the tubular body 10 Correspondingly formed. Further, the rotational positioning of the stopper 8 is performed by forming a recess 69 in the mounting surface 60, embedding a ball plunger 70 on the movable squeeze bar 6 side, and engaging them with each other. On the other hand, as shown in FIG. 3, the step portion 61 abuts and engages with the movable squeeze bar 6 on the side of the fixed squeeze bar 5 that faces the step portion 61 of the stopper 8 that abuts on the mounting surface 60. The contact surface 62 is formed.

Next, the lock mechanism section 9 will be described with reference to FIG. The stud bolt 63 is inserted into a pair of through holes 64 that vertically penetrate through the head 49 of the head portion 4 with the piston 44 interposed therebetween, and threaded portions 65 and 66 are formed at both ends thereof. The screw portion 65 on the tip end side is screwed to the movable squeeze bar 6. In a state where the movable squeeze bar 6 is not fixed at a predetermined position, the lock nut 67 is screwed into the screw portion 65, and the screw portion 66 on the other end side is held in a free state. On the other hand, when the movable squeeze bar 6 is locked, as will be described later, a lock nut 67 is screwed onto the threaded portion 66 on the other end side, and the lock nut 67 is pressed against the inner surface side of the head 49 to move the squeeze bar 6. Regulate the retreat of.

Next, the operation of this embodiment will be described mainly with reference to FIGS. 1, 7, and 8. The position of the guide plate 56 and the L-shaped guide plate 57 of the guide mechanism portion 7 is adjusted based on the diameter of the tubular body 10, and the stopper 8 is rotated to match the stepped portion 61 with the crushing dimension of the tubular body 10. Select one. The lock nut 67 of the lock mechanism portion 9 is screwed onto the screw portion 65 of the stat bolt 63 on the movable squeeze bar 6 side. Next, the cylinder head 19 is rotated within a range of 180 ° in accordance with the installation position of the pipe body 10 and the outer cylinder 35 is rotated around the joint pin 37, and the position of the pin hole 41 is moved to a desired position for positioning. It is fixed by the pin 42. When the above setup work is completed, the head portion 4 is put on the pipe body 10 and engaged as shown in FIGS. 1, 3 and 7. As shown in FIG. 7, the tubular body 10 is in contact with the arcuate contact surface 5a of the fixed squeeze bar 5 at point A, is in contact with the pair of guide plates 56 at point B, and is in contact with the pair of L-shaped guide plates 57 and point C. Contact with. That is, since the pipe body 10 is held at a predetermined position with a total of 5 points in the three-point type of A, B, C, and the squeeze-off tool 1 also contacts the pipe body 10 at 5 points, It is possible to prevent the squeeze-off tool 1 from collapsing with respect to the axial direction of the pipe body 10 and to perform work in a stable state. Next, the pressurizing handle 17 of the hydraulic pump unit 2 is swung to send the oil in the oil tank 12 to the oil chamber 20 and the oil passage 21 side of the cylinder head 19 via the suction valve 22 and the discharge valve 23. The oil entering the oil passage 21 enters the oil passage 38 of the joint pin 37 shown in FIG. 5 and the like, is introduced into the cylinder chamber 39 from the oil passage 40, and moves the piston 44 forward against the spring force of the return spring 46. Let Since the movable squeeze bar 6 is connected to the piston 44, the movable squeeze bar 6 moves toward the fixed squeeze bar 5 and presses the pipe body 10. In this case, the guide plate 50 fixed to the movable squeeze bar 6 is guided by the guide surface 52 to facilitate the movement of the movable squeeze bar 6. As shown in FIG. 8, the compression of the tube 10 ends at the position where the stepped portion 61 of the stopper 8 fixed to the movable squeeze bar 6 collides with the contact surface 62 of the fixed squeeze bar 5. Next, the lock nut 67 of the lock mechanism portion 9 is removed from the screw portion 65 side and screwed to the screw portion 66 side, and the end surface of the lock nut 67 is brought into contact with the head 49. As described above, the movable squeeze bar 6 is fixedly held at a predetermined position by the stud bolt 63 and the lock nut 67, and its retreat is restricted. A predetermined repair work is performed following the compression and closure of the pipe 10. Even if the repair work is performed for a long period of time, the movable squeeze bar 6 is fixedly held at a predetermined position by the lock mechanism portion 9, so that the pipe body 10 maintains a constant compression thickness shown in FIG. 8 during the repair work. .

Next, the returning action of the tubular body 10 will be described. The lock nut 67 is removed from the screw portion 66 side and screwed to the screw portion 65 side to release the restraint of the movable squeeze bar 6. The return lever 31 shown in FIG. 6 is operated to connect the oil passage 28 and the oil passage 27. As a result, the hydraulic oil in the cylinder chamber 39 is returned to the oil tank 12 side. A return spring 46 in the inner cylinder 43 facilitates the return of the piston 44. As described above, the movable squeeze bar 6 retracts. Since the tubular body 10 is formed of an elastic body, when the pressing force of the movable squeeze bar 6 is released, the elastic force causes the tubular body 10 to naturally return to its original state. The predetermined work is completed by removing the head portion 4 from the pipe body 10.

As described above, according to the squeeze-off tool of the present embodiment, the hydraulic pump portion 2 and the head portion 4 and the like have an integrated structure, and the head portion 4 is formed in a rotatable structure, which is extremely advantageous. The operability is good. Further, since the guide mechanism portion 7 and the stopper 8 can be adjusted according to the diameter of the tube body 10, the tube body 10 of various sizes can be compressed and closed by one squeeze off tool.

[0019]

[Effect of device]

 According to the present invention, the following remarkable effects are obtained. (1) Since the hydraulic pump unit, the cylinder mechanism unit, the head unit, and the like are integrated into an integrated structure, the operability is good, and the squeeze-off operation of the pipe body is easily and efficiently performed. (2) It is not necessary to connect the hydraulic pressure supply source to the main body side each time it is used, which improves convenience. (3) Since an integrated hydraulic pump is used, labor can be saved. (4) By providing a stopper that can be rotated to easily accommodate the dimensions of various pipes, pipes of various shapes and sizes can be squeezed off with a single tool. As a result, equipment costs can be reduced. Also, the use of a stopper prevents overcompression. (5) By providing the lock mechanism, it is possible to prevent the pressing force from being lowered due to the retreat of the movable part due to oil leakage during long-term use. (6) Since the head portion has a rotatable structure, the head portion can be easily engaged with the pipe body according to the embedded state of the pipe body, and workability is improved. (7) Since the head portion is formed in a U shape and the guide mechanism portion is provided, it can be easily engaged with the pipe body, and the pipe body can be stably supported at a predetermined position.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the overall structure of an embodiment of the present invention.

FIG. 2 is a perspective view of a stopper of this embodiment.

FIG. 3 is an enlarged partial vertical sectional view showing a head portion and a cylinder mechanism portion of this embodiment.

FIG. 4 is an enlarged partial vertical cross-sectional view showing the periphery of the hydraulic pump portion of the present embodiment.

FIG. 5 is an enlarged partial horizontal sectional view showing a head portion and a cylinder mechanism portion of the present embodiment.

FIG. 6 is an enlarged partial horizontal cross-sectional view showing the periphery of the hydraulic pump portion of the present embodiment.

FIG. 7 is a partial side view for explaining the operation of the present embodiment.

FIG. 8 is an explanatory partial side view showing a compressed state of the tubular body according to the present embodiment.

[Explanation of symbols]

 1 Hydraulic pump integrated squeeze-off tool 2 Hydraulic pump part 3 Cylinder mechanism part 4 Head part 5 Fixed squeeze bar 5a Contact surface 6 Movable squeeze bar 7 Guide mechanism part 8 Stopper 9 Lock mechanism part 10 Tubular body 11 Fixed handle 12 Oil Tank 13 Grip 14 Body 15 O-ring 16 Ram chamber 16A Ram 17 Pressure handle 18 Joint 19 Cylinder head 19a Projection 20 Oil chamber 21 Oil passage 22 Suction valve 23 Discharge valve 24 Return valve 25 Ball 26 Push pin 27 Oil passage 28 Oil Passage 29 oil passage 30 relief valve 31 return lever 32 set screw 33 grooved pin 34 mating groove 35 outer cylinder 36 tongue 37 joint pin 38 oil passage 39 cylinder chamber 40 oil passage 41 pin hole 42 positioning pin 43 inner cylinder 44 piston Four 5 Insertion hole 46 Return spring 47 Spring hook 48 Bolt 49 Head 50 Guide plate 51 Bolt 52 Guide surface 53 Bolt 54 Guide 55 Bolt 56 Guide plate 57 L-shaped guide plate 58 Long hole 59 Spindle 60 Mounting surface 61 Step 61a Step 61b Step portion 61c Step portion 62 Abutment surface 63 Stud bolt 64 Through hole 65 Thread portion 66 Thread portion 67 Lock nut 68 Thumb screw

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location F16K 7/04 (72) Creator Hiroyuki Watanabe 3039, Sasaga, Matsumoto-shi, Nagano Prefecture Izumi Seiki Co., Ltd. Within

Claims (3)

[Scope of utility model registration request] 1. A hydraulic pump unit, and a head unit connected to the hydraulic pump unit via a cylinder mechanism unit, the head unit having a fixed squeeze bar for supporting a tubular body to be compressed,
It has a movable squeeze bar connected to the cylinder mechanism section, a guide mechanism section for holding the tubular body at a predetermined position, and a stopper for restricting the compressed thickness of the tubular body, and the stopper is provided on the movable squeeze bar. A hydraulic system characterized in that it is movably supported and disposed at a position facing the fixed squeeze bar, and that a plurality of step portions facing the moving direction of the movable squeeze bar are formed. Pump integrated squeeze-off tool. 2. The hydraulic pump integrated squeeze off tool according to claim 1, wherein the head portion has a lock mechanism portion that holds the movable squeeze bar to the compressed thickness of the pipe body. 3. The head portion is connected to the hydraulic pump portion so as to be rotatable about an axial direction of the hydraulic pump portion and vertically rotatable in the axial direction. Squeeze off tool with integrated hydraulic pump.