JPH0519582U - Squeeze concrete pump - Google Patents

Abstract

(57) [Summary] [Purpose] To extend the life of the pumping tube by recovering the deterioration of the sealing function due to wear of the inner wall of the pumping tube. [Structure] Squeeze roller 2 in a cylindrical casing 1
The rotating body 3 having the above is incorporated. A cushion pad 5 is provided in the casing 1 along the peripheral wall surface. Pad 5
Inside, the suction port 7 is provided at one end and the discharge port 8 is provided at the other end.
The pumping tube 6 is bent into a U shape and arranged. A part of the pad 1 located at the crushing start portion A and the crushing end portion B of the pumping tube 6 is defined as a variable pad portion 10 that can change in the radial direction of the casing 1. When the inner wall of the pumping tube 6 is worn, the variable pad portion 1
0 is displaced to the pumping tube 6 side, the compressing force of the pumping tube 6 is strengthened, and the sealing function is restored.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a concrete pump for discharging concrete toward a pouring place. Particularly, by squeezing a pumping tube inserted in a casing with a roller, concrete is sucked from one end of the pumping tube and the other end is pumped from the other end. The present invention relates to a squeeze-type concrete pump capable of discharging.

[0002]

[Prior Art]

 As shown in FIG. 4, the squeeze type concrete pump has a casing 1 formed in a cylindrical shape, and a squeeze roller 2 rotatably attached and supported at both ends to rotatably mount the rotator 3 on the outside of the casing 1. The two squeeze rollers 2 are revolved by rotating the rotating body 3 by an installed hydraulic motor 4, and the shaft center O of the rotating body 3 is arranged in the casing 1. A cushion pad 5 made of rubber is provided along the peripheral wall so that an arc surface centered at is formed, and a U-shaped curved portion 6a along the pad 5 is formed inside the pad 5 at an intermediate portion. The pumping tube 6 is inserted and arranged so as to be formed, and one end of the pumping tube 6 serves as a suction port 7 and the other end serves as a discharge port 8 so as to project outside the casing 1. By rotating the rotating body 3, the curved portion 6a of the pumping tube 6 is continuously crushed from a circular shape to a flat shape between the squeeze roller 2 and the pad 5, and a squeeze is applied to suck it from the suction port 7. The concrete is carried to the discharge port 8 side and discharged from the discharge port 8.

[0003]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional squeeze type concrete pump, since the concrete is pumped by continuously crushing the U-shaped curved portion 6a of the pumping tube 6 by the squeeze roller 2, the pumping tube 6 is crushed. As shown in FIG. 5, there is a problem that the inner wall of the pumping tube 6 is locally worn in a convex lens shape over a length range of 200 to 300 mm as shown in FIG. 5 by biting the aggregate at the start portion A and the crush end portion B. The generation of the worn portion 9 on the inner wall has been a major factor governing the life of the pumping tube 6. That is, when the crush end portion B of the pumping tube 6 is not completely sealed between the squeeze roller 2 and the pad 5 due to wear of the inner wall, the discharge port 8 side of the pumping tube 6 is Since the head acts to have a high pressure, when one of the squeeze rollers 2 passes through the crushing end portion B, the reverse flow pressure of concrete acts from the transport pipe (not shown) connected to the discharge port 8 at a high pressure. However, at this time, if the subsequent concrete is not sufficiently filled in the pumping tube 6, the concrete in the pumping tube 6 will flow backward, and the inner surface of the pumping tube 6 will be further locally worn, and If the crushing start portion A is not completely sealed by the crushing action of the other squeeze roller 2, concrete will flow back to the suction side, and Water is leaking into the hopper side pumping of liquidity is deteriorated concrete in the door is to be not carried out efficiently.

The wear part 9 on the inner wall of the pumping tube 6 is detected by a squeezing action of the squeeze roller 2 after putting water into the pumping tube 6 for cleaning after one concrete placing operation is completed. When the water is sent, if the sealing property is poor, the water cannot be sent, so that it is possible to detect the presence of the wear portion 9. If the wear part 9 exists, concrete cannot be pumped unless it is replaced with a new pumping tube.

In view of the above, the present invention provides a sealing function by allowing the pumping tube to be strongly pressed without immediately replacing the pumping tube even if wear occurs at the crushing start portion and the crushing end portion of the pumping tube. It seeks to restore and thus extend the life of the pumping tube.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention arranges a cushion pad along the inner peripheral wall surface of the casing in a cylindrical casing, and one end and the other end inside the cushion pad. Of the pumping tube, which is designed to protrude outside the casing, is arranged in a U-shape curved along the cushion pad, and is installed in the casing. In the squeeze type concrete pump, in which the concrete sucked from one end of the pumping tube is discharged from the other end by continuously crushing and squeezing the curved portion of the pumping tube between the pumping pad and Part of the cushion pad located at the crush start and end of the pumping tube A configuration in which a variable pad portion formed by displaceable configured direction.

[0007]

[Action]

 If the inner wall is worn at the crush start or crush end of the pumping tube and the sealing function at the time of crushing deteriorates, move the variable pad section toward the pumping tube. The displacement of the pad portion strengthens the force of pressing the pumping tube, so that the sealing function can be restored.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. Like the squeeze type concrete pump shown in FIG. 4, a cylindrical casing 1 is provided with an inner peripheral wall surface thereof. The cushion pad 5 is arranged along with the pad 5, and an intermediate portion of a pumping tube 6 having one end and the other end protruding outside the casing 1 is formed inside the pad 5 in a U-shape along the pad 5. The curved portion 6a of the pumping tube 6 is continuously crushed and squeezed between the squeeze roller 2 of the rotating body 3 incorporated in the casing 1 and the pad 5 so that the pumping is performed. In the structure in which the concrete sucked from the suction port 7 at one end of the tube 6 is discharged from the discharge port 8 at the other end, the crush start portion A of the pumping tube 6 A part of the cushion pad 5 located at the crush end portion B is used as a variable pad portion 10 which is displaceable in the radial direction of the casing 1.

As shown in detail in FIG. 2, the variable pad portion 10 is provided with a pad body 5 a having a hollow structure having a cross-sectional shape of middle height as a separate body from the cushion pad 5, and the pad body 5 a Is connected to a fluid supply pipe 11 for supplying a fluid to the inside so as to expand the pad body 5a and a fluid discharge pipe 12 for discharging the fluid in the pad body 5a. The amount of expansion of the pad body 5a can be adjusted by using the discharge pipe 12 to move the fluid in and out of the pad body 5a.

At the crush start portion A or the crush end portion B, if the inner wall of the pumping tube 6 is worn and the seal function is impaired due to the crush, causing a problem in concrete pumping, the variable A fluid is supplied from the fluid supply pipe 11 into the pad body 5a of the pad portion 10 so as to be sealed therein, and the pad body 5a is expanded. In this state, when the pumping tube 6 is crushed between the pad body 5a and the squeeze roller 2, since the pad body 5a has a middle-height shape, the center portion of the width of the pumping tube 6 is strongly compressed. The crushed surface pressure is made uniform in the width direction, so that the sealing property can be improved. Therefore, it does not hinder the concrete pumping.

In the above description, the amount of fluid enclosed in the pad body 5a is adjusted according to the state of wear of the inner wall of the pumping tube 6 to appropriately select the expansion amount of the pad body 5a toward the pumping tube side. Since the deterioration of the sealing function due to wear can be recovered, the life of the pumping tube 6 can be extended.

Next, FIG. 3 shows another embodiment of the present invention. Instead of the variable pad portion 10 using the pad body 5a having the hollow structure as shown in FIG. Using the pad body 5b having an actual structure, and the front end surfaces of a suitable number of bolts 14 screwed through the casing 1 are brought into contact with the rear surface of the holding plate 13 that holds the pad body 5b. The variable pad portion 10 is configured such that the pad body 5b can be displaced in the radial direction of the casing 1 via the holding plate 13 by adjusting the screwing of 14.

In the case of the embodiment shown in FIG. 3, the pad body 5 b can be pressed toward the pumping tube 6 side by screwing in the bolt 14, so that the same action and effect as in the case of the above embodiment can be obtained. Can be played.

In the above-described embodiment, as the variable pad section 10, the pad bodies 5a and 5b which are separate from the cushion pad 5 are used, but the variable pad section 10 is integrated with the cushion pad 5. As a matter of course, it may be a product, and various modifications may be made within a range not departing from the gist of the present invention.

[0016]

[Effect of the device]

 As described above, according to the squeeze type concrete pump of the present invention, a part of the cushion pad located at the crushing start portion and the crushing end portion of the pumping tube by the squeeze roller can be displaced in the radial direction of the casing. The variable pad part is pumped when the inner wall of the crushing start part and the crushing end part of the pumping tube wears and the sealing function at the time of crushing is impaired. By displacing to the tube side, the pumping tube can be pressed strongly against the squeeze roller, and the deterioration of the sealing function can be recovered, thereby extending the life of the pumping tube. Exert an effect.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a squeeze type concrete pump of the present invention.

FIG. 2 is an enlarged arrow view in the direction II of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a schematic view showing an example of a conventional squeeze type concrete pump.

FIG. 5 is an enlarged arrow view in the V direction of FIG.

[Explanation of symbols]

 1 Casing 2 Squeeze Roller 3 Rotating Body 5 Cushion Pad 5a, 5b Pad Body 6 Pumping Tube 6a Curved Part 10 Variable Pad Part A Crush Start Part B Crush End Part

Front page continuation (72) Inventor Takao Tatezawa 3-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Technical Research Institute (72) Inventor Katsuo Kaneda 2-9 Yaesu, Yaesu, Chuo-ku, Tokyo Ishikawajima Construction Machinery Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A cushioning pad is arranged in a cylindrical casing along an inner peripheral wall surface of the casing, and one end and the other end of the cushioning pad are protruded inside the cushioning pad. The intermediate portion of the pumping tube is arranged in a U shape along the cushion pad, and is arranged between the squeeze roller of the rotating body incorporated in the casing and the cushion pad. In a squeeze type concrete pump in which the concrete sucked from one end of the pumping tube is discharged from the other end by continuously crushing and squeezing the curved portion, the crushing start part and the crushing end part of the pumping tube are A part of the cushion pad located is configured to be displaceable in the radial direction of the casing. A squeeze type concrete pump characterized by a variable pad section.