JPH06257563A - Sliding plate and sliding portion of oscillating pipe in concrete pump - Google Patents

Abstract

PURPOSE:To prevent rings from disengaging from a sliding plate and an oscillating pipe and to prevent warping and cracking of the rings by mounting the rings on a sliding surface, the rings each made from a wear resistant material and having large- and small-diameter portions collectively provided therein. CONSTITUTION:As a pair of concrete cylinders 5, 5 is operated, an oscillating pipe 6 is oscillated within a hopper 1 so that ready-mixed concrete is fed to the oscillating pipe 6 from the pair of concrete cylinders alternately and is transported using a transport pipe 7. The end face 12c of a base 12 and the end face of a ring 13, which are made to abut to the sliding surface 2d of a sliding plate 2 and to the end face 11c of a ring 11, respectively, slide respectively on the sliding surface 2d of the sliding face 2 and the end face 11c of the ring 11 as the oscillating pipe 6 oscillates. All of these sliding members are fabricated from a wear resistant material. Then the rings 11, 13 have their respective large-diameter portions 11a, 13a fitted into the respective large-diameter openings 2b, 12a of the sliding plate 2 and the base 12 and are therefore prevented from disengaging, so as to properly retain the interferences of the small-diameter portions 11b, 13b of the rings 11,13 respectively for the sliding plate 2 and the base 12, so as to prevent warping and cracking of the rings 11, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding part of a concrete pump and a sliding part of an oscillating tube for transporting ready-mixed concrete as a piston by alternately operating a pair of concrete cylinders.

[0002]

2. Description of the Related Art As a concrete pump, a slide plate having a pair of circulation holes is attached to a hopper for storing ready-mixed concrete, and a pair of concrete cylinders are provided on the outer sides of the slide plates in the circulation holes of the slide plate. A rocking tube that is individually connected to each other and that rocks the rocking end to communicate with the pair of flow holes alternately is slidable on the sliding plate. It is known that it is provided in contact with.

In the concrete pump described above, the rocking tube rocks in contact with the operation of a pair of concrete cylinders whose phases are changed so that the rocking end of the rocking tube contacts a sliding plate provided in the hopper. The oscillating end of the moving tube and the sliding plate are very susceptible to wear.

Therefore, as shown in FIGS. 6 and 7, a wear-resistant material such as WC (tungsten carbide / cobalt) -based cemented carbide is used for the flow hole of the sliding plate 20 and the swing end of the swing tube 21. It is known to fit the rings 22 and 23 made of heat shrink-fitting or cold-fitting (JP-A-1-26).
No. 7372).

[0005]

However, in the reinforcing method shown in FIGS. 6 and 7, the rings 22 and 23 are fixed to the sliding plate 20 and the rocking tube 21 only by the tightening force due to the interference fit.
There is a drawback that the rings 22 and 23 are easily separated from the sliding plate or the like. If the tightening margins of the rings 22 and 23 are increased in order to prevent this, warping or cracking is likely to occur, which causes a new problem.

It is an object of the present invention to provide a sliding portion between a sliding plate and a rocking tube in a concrete pump, in which the ring does not come off from the sliding plate or the rocking tube, and warping or cracking hardly occurs. And

[0007]

In order to achieve the above object, the invention of claim 1 is such that a hopper containing fresh concrete is provided with a sliding plate having a pair of through holes, On the outer side, a pair of concrete cylinders are provided by individually connecting to the flow holes of the sliding plate, and inside the hopper, a swing end is swung to alternately turn into the pair of flow holes. In a concrete pump in which a rocking tube for communication is provided with the rocking end slidably abutting on the sliding plate, a fitting in which a large diameter port and a small diameter port are continuously provided on the sliding plate. The fitting hole is formed by arranging the small diameter port on the rocking tube side, and the fitting hole is provided with a ring made of a wear-resistant material in which a large diameter part and a small diameter part are connected, and the small diameter part is used as the small diameter port. In addition, the large diameter part is fitted into the large diameter mouth respectively, and the end face of the small diameter part is almost aligned with the sliding surface of the sliding plate. Interference fit to the small diameter portion to the small-diameter opening to match, and has a structure which is mounted to constitute a circulation hole.

According to a second aspect of the present invention, a slide plate having a pair of flow holes is attached to a hopper for containing ready-mixed concrete, and a pair of concrete cylinders are provided on the outer side of the slide plate. A rocking tube is provided which is individually connected to the flow holes of the moving plate, and a rocking tube for rocking the rocking end to communicate with the pair of flow holes alternately is provided in the hopper. In a concrete pump slidably brought into contact with the sliding plate, a base having a large-diameter port and a small-diameter port continuously connected to a swing end of the swing pipe, and a small-diameter port sliding plate. A ring made of wear-resistant material in which a large-diameter portion and a small-diameter portion are connected in series, and the small-diameter portion is inserted into the small-diameter opening and the large-diameter portion is inserted into the large-diameter opening. At the same time, make sure that the end surface of the small diameter part is almost aligned with the sliding surface of the die and then press fit into the small diameter part. It was attached configuration.

According to the invention of claim 3, 4 or 5, in the invention of claim 1 or 2, the ring is made of WC-based cemented carbide, and the base of the rocking tube and the sliding plate are made of high chromium wear-resistant cast iron. .

[0010]

[Function] The large-diameter portion of the ring fitted in the large-diameter opening of the sliding plate or the die prevents the ring from being pulled out. Therefore, the tightening margin of the small diameter portion of the ring may be small, and the ring will not be warped or cracked.

[0011]

1 to 5 show an embodiment of a sliding portion of a sliding plate and an oscillating pipe in a concrete pump of the present invention. In these figures, reference numeral 1 is a hopper for containing ready-mixed concrete. One side of this hopper 1 (left side in FIG. 1)
A sliding plate 2 is attached to the shaft by a plurality of bolts 3 (only one is shown in FIG. 1), and a bearing 4 is provided on the other side.

The sliding plate 2 is provided with two fitting holes 2a, 2a in which a large diameter opening 2b and a small diameter opening 2c are arranged in series.
The large diameter port 2b is located on the outside (left side in FIG. 1) and the small diameter port 2c is located on the inside. The sliding plate 2 is made of wear resistant material,
It is preferably made of high chromium wear-resistant cast iron.
Outside the sliding plate 2, a pair of concrete cylinders 5,
5 are individually located in the fitting holes 2a, 2a of the sliding plate 2 and provided in parallel with each other.

The bearing 4 of the hopper 1 has a swing tube 6
Is attached with its swinging end arranged on the sliding plate 2. The swing pipe 6 is connected to the transport pipe 7, and is swung about the rotary shaft 8 so that the swing ends are alternately placed at the fitting holes 2a, 2a of the sliding plate 2. The transport pipe 7 is fixed to the hopper 1, and the rotating shaft 8 is a driving device 9 such as a cylinder.
The left and right are alternately rotated by a predetermined angle by.

Reference numeral 11 is a ring. A large diameter portion 11a and a small diameter portion 11b are connected to the ring 11 continuously. The ring 11 has a large diameter portion 11a with a large diameter opening 2b of the fitting hole 2a.
In addition, the small diameter portion 11b is fitted into the small diameter opening 2c of the fitting hole 2a so that the end surface 11c of the small diameter portion 11b is aligned with the sliding surface 2d of the sliding plate 2 and only the small diameter portion 11b is fitted into the fitting hole 2a. An interference fit such as a shrink fit or a cold fit is applied to the small-diameter port 2c so as to be integrally fixed to the sliding plate 2. The ring 11 is made of wear resistant material, preferably WC cemented carbide. Further, the sliding surface 2d of the sliding plate 2 shown in the figure is formed by the hardfacing by plasma spraying, but it is not always necessary to do so.

A base 12 is integrally fitted to the tip of the rocking tube 6. The mouthpiece 12 has a large diameter mouth 12a and a small diameter mouth 1
2b are arranged in series. The large-diameter opening 12a is located at the back of the base 12, and the small-diameter opening 12b is opened at the tip of the base 12. The base 12 is made of a wear resistant material, preferably a high chromium wear resistant cast iron.

Reference numeral 13 is a ring. Similar to the ring 11, the ring 13 is also provided with a large diameter portion 13a and a small diameter portion 13b. The ring 13 has a large diameter portion 13a on the large diameter portion 12a of the mouthpiece 12, and a small diameter portion 1a.
3b is inserted into the small diameter mouth 12b of the mouthpiece 12 so that the end surface 13c of the small diameter portion 13b is aligned with the end surface 12c of the mouthpiece 12, and only the small diameter portion 13b is shrink fitted or shrink fitted to the end surface 12c of the mouthpiece 12. And is integrally fixed to the base 12. This ring 13 is also made of wear resistant material, preferably WC cemented carbide. Like the sliding surface 2d of the sliding plate 2, the end surface 12c of the mouthpiece 12 is formed by a hardened buildup by plasma spraying, but in this case as well, it is not necessary to do so.

The rocking tube 6 has its rocking end, that is, the base 1.
The second end surface 12c (and the end surface 13c of the ring 13) is brought into contact with the sliding surface 2d of the sliding plate 2 (and the end surface 11c of the ring 11). The ring 11 constitutes a circulation hole for ready-mixed concrete, and the concrete cylinder 5 is connected to the circulation hole. Reference numeral 2e is an insertion hole for the bolt 3 formed in the sliding plate 2.

Next, the operation of the sliding plate and the sliding portion of the rocking pipe in the concrete pump of the present invention constructed as described above will be described. This concrete pump, like the conventional concrete pump, has a pair of concrete cylinders 5,
The rocking tube 6 is rocked in the hopper 1 in conjunction with the operation of 5,
Fresh concrete from concrete cylinder 5 to rocking pipe 6
Are alternately sent out to and transported by the transport pipe 7.

The sliding surface 2d of the sliding plate 2 and the end surface 12c of the base 12 and the ring 13 which are in contact with the end surface 11c of the ring 11.
The end surface 13c of the slides the sliding surface 2d of the sliding plate 2 and the end surface 11c of the ring 11 according to the swing of the swing tube 6. However, since the sliding plate 2, the mouthpiece 12, and the rings 11 and 13 are made of a wear resistant material, they are not easily worn and can be used for a long period of time.

Further, the sliding plate 2 and the small diameter portion 11 of the ring 11
If there is a gap between the base 12b and the small diameter portion 13b of the base 12 and the ring 13, the corners of the aggregate in the fresh concrete may be caught in the gap and the rings 11 and 13 may crack. , Small-diameter part 1 located on the sliding side of the rings 11 and 13
1b and 13b are tightly fitted to the sliding plate 2 and the mouthpiece 12 and there is no gap.
There is no risk of breaking 3.

Moreover, the rings 11 and 13 have large diameter portions 11a and 13a on the large diameter openings 2b and 12a of the sliding plate 2 and the mouthpiece 12, respectively.
Since it is inserted, the sliding plate 2 and the cap 12 will not come out of the hopper 1. Therefore, the small diameter portions 11b and 13b of the rings 11 and 13 with respect to the sliding plate 2 and the base 12 are formed.
It is possible to prevent the rings 11 and 13 from warping or cracking by appropriately suppressing the tightening margin.

Large diameter portions 11a, 1 of the rings 11, 13 shown in FIG.
Although 3a has a circular shape and is continuous in the circumferential direction of the rings 11 and 13, it may be formed intermittently without being continuous. In this case, the sliding plate 2 and the large diameter mouths 2b, 12 of the mouthpiece 12
It is possible to match a with the shape of the large diameter portions 11a and 13a.

[0023]

As described above, in the sliding portion of the sliding plate and the rocking pipe in the concrete pump of claim 1, the sliding plate having the pair of circulation holes is attached to the hopper for storing the ready-mixed concrete. A pair of concrete cylinders are provided outside the sliding plate by individually connecting to the flow holes of the sliding plate, and the swinging end is swung in the hopper. In a concrete pump provided with rocking pipes that are alternately communicated with a pair of flow holes, with the rocking ends slidably abutting on the sliding plate, the sliding plate has a large-diameter port. Fitting hole that is continuous with small diameter port,
A ring made of wear-resistant material in which a large-diameter portion and a small-diameter portion are connected to each other is formed in the fitting hole by arranging the small-diameter portion on the oscillating tube side. The small diameter portion is fitted into the large diameter opening, and the end surface of the small diameter portion is made to substantially coincide with the sliding surface of the sliding plate, and the small diameter portion is tightly fitted into the small diameter opening, and a through hole is configured to be attached. And claim 2
According to the invention, a hopper for containing ready-mixed concrete is fitted with a slide plate having a pair of circulation holes, and a pair of concrete cylinders are provided outside the slide plate, respectively, in the circulation holes of the slide plate. And a swing pipe that swings the swing end and communicates with the pair of flow holes alternately in the hopper. The swing end is slidable on the sliding plate. In the concrete pump provided in abutment with, the base having a large-diameter opening and a small-diameter opening in series is attached to the rocking end of the rocking pipe with the small-diameter opening arranged on the sliding plate side. , A ring made of a wear-resistant material in which a large-diameter portion and a small-diameter portion are connected to each other, the small-diameter portion is inserted into the small-diameter opening, and the large-diameter portion is inserted into the large-diameter opening. A structure in which the end surface is almost flush with the sliding surface of the mouthpiece and is tightly fitted to the small diameter part. Because they are, never the ring is disengaged from the sliding plate and the swing pipe. Therefore, the tightening margin of the ring with respect to the sliding plate or the rocking pipe can be reduced to prevent warping or cracking, and the concrete pump can be used in the best condition for a long period of time.

The invention of claim 3, 4 or 5 is, in the invention of claim 1 or 2, characterized in that the ring is a WC-based cemented carbide, and the base of the oscillating tube and the sliding plate are high chromium wear-resistant cast iron. Therefore, the durability is further improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view of a main part of a concrete pump embodying the present invention.

FIG. 2 is a front view of a sliding plate.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view showing a disassembled state of a sliding plate and a ring.

FIG. 5 is a cross-sectional view showing a relationship between a mouthpiece, a ring, and a rocking tube.

FIG. 6 is a cross-sectional view showing a conventional mounting structure of a ring on a sliding plate.

FIG. 7 is a cross-sectional view showing a conventional mounting structure of a ring with respect to a base of an oscillating tube.

[Explanation of symbols]

 1 Hopper 2 Sliding Plate 2a Fitting Hole 2b Large Diameter Port 2c Small Diameter Port 2d Sliding Surface 5 Concrete Pump 6 Oscillating Tube 11 Ring 11a Large Diameter Part 11b Small Diameter Part 11c End Face 12 Mouth 12a Large Diameter Port 12b Small Diameter Port 12c End Face 13 ring 13a large diameter part 13b small diameter part 13c end face

Claims (5)

[Claims] 1. A hopper for storing ready-mixed concrete is provided with a sliding plate having a pair of circulation holes, and a pair of concrete cylinders are provided outside the sliding plate in the circulation holes of the sliding plate. A swinging pipe, which is individually connected and swings the swinging end so as to communicate with the pair of flow holes alternately, slides the swinging end on the sliding plate. In the concrete pump provided so as to freely abut, in the sliding plate, a fitting hole in which a large-diameter opening and a small-diameter opening are provided in series, the small-diameter opening is formed on the rocking pipe side, A ring made of wear-resistant material in which a large diameter portion and a small diameter portion are connected to each other is inserted into the fitting hole, and the small diameter portion is fitted into the small diameter opening and the large diameter portion is fitted into the large diameter opening. The end surface of the is almost aligned with the sliding surface of the sliding plate, and the small diameter part is tightly fitted in the small diameter opening, and A sliding portion of a sliding plate and an oscillating pipe in a concrete pump, which is constructed and attached. 2. A slide plate having a pair of circulation holes is attached to a hopper for containing ready-mixed concrete, and a pair of concrete cylinders are provided outside the slide plates in the circulation holes of the slide plate, respectively. A swinging pipe, which is individually connected and swings the swinging end so as to communicate with the pair of flow holes alternately, slides the swinging end on the sliding plate. In a concrete pump provided so as to freely abut, a base having a large-diameter opening and a small-diameter opening in series is attached to the oscillating end of the oscillating tube with the small-diameter opening arranged on the sliding plate side. A ring made of wear-resistant material in which a large-diameter portion and a small-diameter portion are connected to each other is inserted into the mouthpiece, and the small-diameter portion is inserted into the small-diameter opening, and the large-diameter portion is inserted into the large-diameter opening. The end face of the And a sliding part between a sliding plate and an oscillating pipe in a concrete pump. 3. The sliding portion between the sliding plate and the rocking tube in the concrete pump according to claim 1 or 2, wherein the ring is made of a WC-based cemented carbide. 4. The sliding portion between the sliding plate and the rocking pipe in the concrete pump according to claim 1, wherein the sliding plate is made of high chromium wear-resistant cast iron. 5. The sliding portion between the sliding plate and the rocking tube in the concrete pump according to claim 2, 3 or 4, wherein the die is made of high chromium wear-resistant cast iron.