JPS59231185A - Wear proof special tube - Google Patents

Abstract

PURPOSE:To prevent wearing damage of a tube by a method wherein the pattern unit of ceramic is set integrally to the inner surfacial rubber by vulcanizing bonding into band-shaped condition at upper and lower two places of the tube for pressure sending pump whereat local abrasion, cut-in type abrasion or the like is readily generated. CONSTITUTION:The tube T is formed with an abrasion damage prventing zone at the upper and lower two places of the internal surfacial rubber whereat the local abrasion or the cut-in type abrasion are readily produced pressure generated by the pressure sending of rollers 5 is increased to the maximum pressure under a condition that the tube T is set into a pressure sending unit PU with U-shape, by a method wherein the small pieces of the ceramic 13 of aluminum oxide series prominent in a resistance to abrasion, a bending strength and the like are bonded integrally by vulcanizing them so as to show belt-like condition. According to this method, the local abrasion and the cut-in type abrasion which are the origins of the damage of the tube T may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a special wear-resistant tube integrally molded with a ceramic layer that prevents damage and wear on the local inner surface of a high compression section in a high pressure section of a pump tube.

Conventionally, this type of tube, which is used in squeeze-type pump trucks for pumping mortar, concrete, etc., is a tube that combines an inner rubber made of a rubber-like material made of an elastic polymer material, a strong reinforcing material, and a rubber outer cover. T, Figure 1,
It is used by being set in a U-shape in contact with the groove 3 of a rubber pad RP as a cushioning material of a pressure feeding unit PU of a pump vehicle shown in FIG. The lower portions of the duplex all have reinforcing materials, but the reinforcing materials are omitted in all illustrations below. The state of use is as shown in Figure 1 (schematic vertical cross-sectional view showing the operating state of the pressure feeding unit PIJ) and Figure 2 (cross-sectional view showing the state in which the tube T is crushed by a rubber roller). The concrete is poured from a concrete mixer into the hopper 1 of the pressure feeding unit PU, and the rotor 2 is used to pour concrete into the 8 side of the tube T set in a U-shape in the groove 3 of the rubber pad RP in the metal drum (cylindrical outer wall) 4. The transferred mortar and concrete are transferred to the drive gear 6, within the reduced pressure v10.
While crushing the tube T with the two rollers 5 rotating in the direction of the arrow (counterclockwise rotation in the direction of the arrow) with meshing gear 7.8 and chain 9, the Δ of the tube T is rotated in the direction of the arrow (clockwise rotation).
It is fed under pressure in the side discharge direction. The position of this pressure pump (squeeze) to be pumped is expressed as Vr 1M-IX in terms of time.
Time-■11. 'j and minute υ1, the internal pressure of the stomach due to pressure feeding by the roller 5 is increased from the vicinity to the pressure 1 arm and I at the time of vr.
From X o'clock position A. 1, suddenly "-arms, from X o'clock position■
The maximum pressure is reached up to the hour position, and when 1-ra 5 passes the ■ o'clock position, the internal pressure suddenly drops, and the instant 1~
1, where pressure feeding and suction are repeatedly performed 1, that is, the area near position A1 is compressed under high pressure (this is compressed), and the inner surface of the portion where the compression m is large causes local wear 11 (3rd position) up and down in the compression direction. (See Figure 1, Figure 3-2), and sometimes a cut-like abrasion 12 (see Figure 4-1, Figure 4-2) caused by a sharp-edged scoop in the fluid. Therefore, there were many cases where the dip was damaged in a short period of time and became unusable.

In conclusion, this invention investigates the deficiencies of the prior art and attempts to prevent those deficiencies. J3, Figure 3-1 above
Figure 3-21J shows localized wear 11 on the inner surface of the tube.
The cross-sectional view of the blade, Fig. 4-1, shows the notch-like wear 12.
FIG. 4-2 is a cross-sectional view of the duplex at the ■ o'clock position. In the fluid such as slurry (3furry) solids that are pumped through the tube T,
It contains relatively fine grains of sand with very sharp edges. In the case of such a fluid pressure, pumping and suction are repeated at the position ①, but at the moment when the tube T tries to restore itself immediately after being continuously compressed, a gap of a very small area is created. AG (see Figure 5) is generated.

Through this small gap ΔG, small sand grains move to the right at a sharp corner due to the pressure on the A side (discharge side) of the tube T.
It is thought that when flowing back to the side, cut-like wear occurs on the inner rubber of the tube T, which causes damage, grows and destroys the reinforcing layer, leading to early losses.

Therefore, as a result of searching for a method to explain the basic cause that is the root cause of this damage, we came to the conclusion that it can be significantly improved by locally combining metal ceramic, which is completely different from rubber. be.

3- That is, with this, early local wear and uneven wear can be fundamentally solved.

Next, aspects of the wear-resistant special duplex of the present invention will be described in detail.

The root of the damage to this tube T is located in the area before and after the ■ position when the two [1-ra 5 come on a straight line connecting the V1 o'clock position and the ■ o'clock position. Based on the knowledge that localized wear and notch-like rubbing occurs, we realized that it is necessary to prevent the local triggers, and as a result of searching for the right material to prevent this, we found that ceramic is the right material to eliminate and cover the local factors. We have reached the conclusion that this is the case.

Ceramic materials include silicon carbide brane, titanium oxide, silicon nitride <Si3N+), aluminum oxide, etc., but aluminum oxide is particularly preferred due to its wear resistance, bending strength, etc.

In addition, since ceramic has a very smooth surface under the processing conditions, the necessary sealing force (usually 20 to 3
0 to 9/? ) is obtained.

4- Also, when ceramic and rubber are vulcanized and integrally molded using an adhesive, strong adhesion of 10 to 20 to 9/Crj can be obtained.

In addition, the ceramic that is bonded to the rubber to form a composite is formed into small plate-like pieces so as not to be damaged by compression and bending, and the size of the small pieces is, for example, 5 to 15 mm in width. Length 5~10n+n+x Thickness 2
-4 mm are integrally bonded to the top and bottom of the inner rubber in the range before and after the position of the tube T when it is set in a U-shape in the pressure feeding unit PU.

The small pieces of ceramic 13 are arranged in the longitudinal direction, and the sixth
As shown in Figure 1 and Figure 6-2, the array unit UA is
(2) A wear prevention zone WRZ is formed in a band shape before and after the o'clock position.

In addition, FIG. 6-1 is a cross-sectional view showing the setting state of the array unit UΔ of the lamic 13 on the local inner surface under the tube, and FIG. 6-2 is a cross-sectional view taken along the line ■-■.

The range of the wear prevention zone WR7 consisting of the array unit UA of the ceramic 13 varies depending on the noise of the tube, usage conditions, type of pump, etc. Set to about ±50 to 150 mm.

Fig. 7-1 shows the state of the compression IFIt in the wear prevention zone WRZ in a longitudinal section, and Fig. 7-2 shows the state of the compression IFIt in the wear prevention zone WRZ.
The figure shows a cross section at the '+ position when compressed.

Since the wear-resistant special tube of the present invention has 1 unit l-UΔ of ceramics 13 formed vertically on its inner rubber surface, the tube is designed so that the arrangement position of the ceramics on the inner surface rubber can be easily determined. : 2-2 on the outer surface of the tube in the axial direction
By inserting an identification line such as the vermilion color of a book, or by bending the tube naturally, the ceramic arrangement unit U will be vertical. - Yes.

Next, we will show the results of a comparative test between the tube of this invention and a conventional tube. J.

Example pressure-fed material Mortar tube size 50 mmφ x length 1500 ml x wall thickness 15 mm
+.

Pump 7 I-IP, 45 rpm.

Pressure feeding unit Drum diameter 580 + 11mφ.

Roller diameter 120mmφ x length 115mm.

(See next page) 7- Table 1 Dave's durability = 8- As shown above, as shown in Table 1, in the case of composite tubes made of rubber and ceramic, the durability life is longer than that of conventional tubes. In comparison, the effects of the treatment groups were demonstrated.

[Brief explanation of drawings]

Fig. 1 is a schematic longitudinal sectional view showing the operating state of the pressure feeding unit, Fig. 2 is a cross sectional view showing the state in which the tube T is crushed by a rubber roller in the pressure feeding unit, and Fig. 3-1 is a schematic longitudinal sectional view showing the operating state of the pressure feeding unit. , Figure 3-2 is a cross-sectional view of the tube showing local wear on the inner surface, Figure 3-2 is a cross-sectional view taken along the line ■-■, 2 is a cross-sectional view along the ■-store building line. FIG. 5 is a cross-sectional view of the tube showing an example of the generation of voids. FIG. 6-1 is a cross-sectional view of the tube showing the setting state of the ceramic arrangement unit. Fig. 2 is a cross-sectional view taken along the cutting line, Fig. 7-1 is a longitudinal cross-sectional view of the compressed portion of the abrasion prevention 1] zone, and Fig. 7-2 is a cross-sectional view at the ■ o'clock position. T...Dupe UA...Arranged connit WRZ...Abrasion prevention zone 11...Local wear 1
2... Notch-like wear 13... Ceramic agent Patent attorney Yasushi Oshima ■11 -11=

Claims (1)

[Claims] (1) In a pump tube that pumps concrete, mortar, etc., ceramic array units are installed in the upper and lower two locations where localized wear, cut-like wear, etc. are likely to occur, in a band-like manner, by vulcanization bonding with inner rubber. A special wear-resistant tube characterized by an integrally set abrasion prevention zone.