JPH0353017Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure pump for pumping materials such as fresh concrete.

[Prior Art] As a device for pumping materials with poor fluidity such as fresh concrete or earth and sand, there is a penetrating cylinder pressure pump.

As shown in FIGS. 7 and 8, a conventional pressure pump a of this type has a pressure feeding device consisting of a penetration cylinder (penetration tube) d and a piston e at the bottom of a hopper c that stores fresh concrete b. A plurality of the tubes are arranged in parallel, and a discharge tube h is provided, which swings within the hopper c and whose introduction end f is selectively connected to the tip opening g of the penetration tube d.

When the fresh concrete b is forced to be fed by the pressure pump a, one of the penetration tubes d is penetrated into the fresh concrete b in the hopper c, and the fresh concrete b is taken into the inside through the tip opening g. At this time, the piston e is kept stationary, the penetration tube d is expanded to the maximum, and the inside is filled with ready-mixed concrete b.The penetration tube d and the piston e are simultaneously retreated to expand the penetration tube d. Pull it out of Hotupa c.

Next, the swing actuator i is operated to swing the discharge pipe h, and its introduction end f is connected to the tip opening g of the retracted penetration tube d.Then, the piston e is pushed forward to enter the penetration tube d. Fresh concrete b taken in is pumped to the discharge pipe h side. Then, during the pressure feeding process of one penetration tube d, the other penetration tube d is penetrated into the hopper c and fresh concrete b is taken into the inside thereof,
After pulling out the hopper c and leaving it on standby, once the pressure feeding process of one of the penetration tubes d is completed,
The discharge pipe h is swung and connected to the other penetration tube d, and thereafter, this pumping process is sequentially repeated to pump the fresh concrete b.

[Problem to be solved by the invention] By the way, in the conventional cylinder penetrating pump a, the proximal end j side of the discharge pipe h is pivotally supported on the wall of the hopper c, and the introduction end f side is oscillated within the hopper c. The reaction force of the discharge pipe h which is received during the pressure feeding process is obtained by the wall of the hopper c. For this reason, there was a problem in that the wall portion of the hopper c, which does not have high rigidity, had to be formed with a heavy support structure.

In addition, since the discharge pipe h is rapidly oscillated within the hopper c, a cavity is created behind it within the hopper c, the amount of fresh concrete b taken into the penetration tube d is reduced, and the volumetric efficiency of the pump is reduced. There was a problem with the decline.

On the other hand, as another conventional technology, "Flow path switching device for concrete pump" (Utility Model Application Publication No. 57-200677)
and “Pump for fresh concrete” (Unexamined Japanese Patent Publication 1973-
1405) has been proposed.

These proposals disclose techniques for pumping fresh concrete without using a discharge pipe that swings within the hopper, and if these proposals are applied, one of the problems mentioned above will be that the volumetric efficiency of the pump will decrease. As for the issue, it will be resolved.

However, in the former of the above proposals, the reaction force at the time of pumping is received by the hopper wall, and in particular, the direction in which the piston pumps the fresh concrete in the hopper and the axial direction of the discharge pipe on the receiving side are bent. Therefore, a larger reaction force will be generated than when using the bent protruding tube. Therefore, there are other problems among the above problems.
Regarding the point that the support structure becomes heavy, this proposal (Utility Model Application Publication No. 57-200677)
It cannot be solved even by

Furthermore, in the latter case, a configuration is shown in which a pressure feed pipe provided outside the hopper is swung, and the reaction force on the wall of the hopper is expected to be reduced. However, even in this proposal, the direction of pressing the fresh concrete and the direction of the receiving side pressure pipe are bent, and the reaction force is received only by the swing bearing (ball joint device). As the pumping amount (pressure) of fresh concrete increases, the structure of the connection between the hopper and the pumping pipe and the rocking bearing must be made heavier, and there is also concern that the durability will decrease.

Therefore, in view of the above-mentioned circumstances, the present invention aims to provide a durable pressure pump that can simplify the support structure on the discharge pipe side by appropriately receiving the reaction force even when the pressure during pressure pumping is high. It was invented.

[Means for Solving the Problems] The present invention has a hopper that has a plurality of discharge holes at the bottom and stores objects to be transported, and a plurality of inlets that are provided directly opposite the discharge holes and that penetrate into or exit the hopper. The hopper has a cylinder, a piston that slides inside the penetration cylinder and forces the transferred material taken into the cylinder to a discharge hole, and an introduction end that is provided on a base outside the hopper and connects to the discharge hole. a suitably bent discharge pipe;
A radial bearing connects the base end of the discharge pipe to one of the discharge holes by supporting it rotatably around a horizontal axis eccentric to the discharge hole and swinging it, and a radial bearing between the radial bearing and the discharge hole. The thrust bearing includes a rotating shaft coaxial with the horizontal shaft and a support bracket attached to the bent portion of the discharge pipe and pivoting around the rotating shaft.

[Operation] With the above configuration, the penetration cylinder sequentially penetrates into the hopper, takes in the object to be transferred therein, and connects to the discharge hole, and the piston forces the object to be transferred toward the discharge hole. The discharge pipe is connected to the discharge hole by swinging around the horizontal axis, receives the object to be transported in the axial direction of the introduction end, and guides it to the proximal end side. The radial bearing supports this swinging of the discharge pipe outside the hopper. The thrust bearing follows this swing and supports the discharge pipe at its bent part, thereby appropriately supporting the pressure in the piston pumping direction and reducing the axial reaction force at the base end of the discharge pipe in the radial bearing. do.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of a pressure pump according to the present invention.

This pressure pump has a hopper 2 which has two discharge holes 23a and 23b in the side wall 22 at the bottom and stores the fresh concrete b to be transferred, and a discharge hole 23
Two penetrating cylinders 10a, 10 that are provided directly opposite the hoppers 23a and 23b and penetrate into or exit the hopper 2.
b, and pistons 12a, 12 that slide inside the penetration cylinders 10a, 10b and forcefully feed the fresh concrete taken into the cylinders to the discharge holes 23a, 23b.
b, a discharge pipe 5 provided on a base 6 outside the hopper 2, a radial bearing 30 that rotatably supports the base end 29 of the discharge pipe 5 on the base 6, and a radial bearing 3.
0 and a thrust bearing section 36 provided between the exhaust hole 23 and the exhaust hole 23. Therefore, the penetrating cylinder 10 and the piston 12 constitute a pumping device 3 for pumping fresh concrete to the discharge hole 23.

The hopper 2 is installed on a base 6 via legs 7, and has an input port 8 formed in its upper part for supplying fresh concrete from a concrete mixer truck, batcher plant, or the like.

The penetration cylinders 10a, 10b penetrate the side wall 9 on the opposite side to the discharge holes 23a, 23b of the hopper 2,
It is designed to move forward and backward on the inner bottom of Hoppa 2,
Its tips 21a and 21b are opened, and the discharge hole 2
It is designed to fit into discharge pipes 24a and 24b that partition the pipes 3a and 23b. Also, the penetration cylinder 1
Penetration actuators 11a, 1 are provided at the base ends 15a, 15b of 0a, 10 for forward and backward movement.
1b is provided via mounting brackets 17a and 17b. The pistons 12a, 12b are equipped with pressure feeding actuators 13a, 13b for reciprocating the pistons, and these actuators 11a, 11b, 13a, 13b
operating rods 48a, 48b, 14a, 14b
are connected to mounting brackets 17a, 17b and pistons 12a, 12b, respectively.

These actuators 11, 13 and the penetration cylinder 10 are supported on the base 6 by a pair of fixed brackets 46a, 46b, 47a, 47b separated from each other in the forward and backward directions. Support rods 16a, 16 are provided between these fixed brackets 46, 47.
b is stretched over and reinforced. Also hoppa 2
The side fixed brackets 46a, 46b are provided with cylindrical support brackets 18a, 18b which slidably support the penetrating cylinders 10a, 10b. Also, support brackets 18a, 18b
and the insertion holes 20a of the penetration cylinders 10a, 10b,
Connecting pipes 19a and 19b are provided between the pipe 20b and the pipe 20b.

A switching valve body 26 is provided at the outer end of the discharge pipe 24 with a valve seat 25 interposed therebetween. As shown in FIGS. 4 and 5, the switching valve body 26 has an arc shape, and a through hole 27 is formed in the center to communicate with one of the discharge holes 23, and both sides thereof are connected to the other discharge hole. It is appropriately extended to close the hole 23.

The discharge pipe 5 has an introduction end 28 connected to the through hole 27.
It is smoothly bent from the base end 29 to the base end 29, and the axis at the base end 29 is formed to be parallel to the introduction end 28. Further, the base end 29 is connected to the transfer pipe 4.

The radial bearing 30 supports the base end 29 of the discharge pipe 5,
It is rotatably supported around a horizontal axis eccentric to the discharge hole 23. Also, radial bearing 30
A swing actuator 31 supported on a base 6 is provided near the hopper 2 side, and is connected to the discharge pipe 5 via an arm member 32.
That is, by swinging the discharge pipe 5 due to its expansion and contraction,
The introduction end 28 is connected to one of the discharge holes 23.

The thrust bearing part 36 has an upper part attached to a rotating shaft 35 located coaxially with the base end 29 (horizontal axis) and a bent part 33 of the discharge pipe 5, and a lower part is rotatably supported by the rotating shaft 35. support bracket 34
It is composed of:

As shown in FIG. 3, the rotating shaft 35 supported in the thrust bearing part 36 is supported by a bearing housing 37 via a bearing 38, and the flange part 39 at the base end of the rotating shaft is bolted to the support bracket 34. They are joined by 40. The rotary shaft tip 41 has a reduced diameter and projects outside the bearing housing 37, and has a threaded portion 49 formed on its outer circumferential surface, and the threaded portion 49 transmits the thrust load of the rotary shaft 35 to the bearing housing 37. In order to do this, locking nuts 41a and 41b consisting of a double nut mechanism are screwed together. This nut 41 and bearing housing 3
7, there is a thrust washer 42 and a bearing 38.
A flange portion 38a is interposed between the flange portion 38a and the flange portion 38a.
The thrust load of the rotating shaft 35 is transmitted to the bearing housing 37 by contacting the thrust receiving surface 37a of the bearing housing 37.

Therefore, the reaction force generated in the discharge pipe 5 due to the discharge pressure of the fresh concrete pumped by the pumping device 3 is mainly received by the thrust bearing portion 36.

In addition, as shown in FIG. 3, an axially slidable wear ring 4 is provided at the outer end of the discharge pipe 24.
3 is inserted. The hopper side end 43a of this wear ring 43 is formed with a chamfered part 43b that slopes toward the inner diameter side, and the wear ring 43 is pushed toward the discharge pipe 5 side by the discharge pressure of fresh concrete from the pumping device 3. and is pressed against the switching valve body 26.

On the other hand, a wear plate 44 is brazed to the sliding surface 26a of the switching valve body 26 against the valve seat 25 over the range in which the wear ring 43 contacts, as shown in FIG. This wear plate 44 is desirably made of a super hard material such as tungsten carbide. The wear ring 43 is made of a softer material than the wear plate 44, and when it slides on the wear plate 44 due to the swinging of the switching valve body 26, the wear ring 43 side wears and forms a contact surface. Good sealing performance is maintained between the wear ring 43 and the wear plate 44.

In addition, as shown in FIG. 3, the valve seat 25
A gland packing 45 is formed on the sliding surface so as to surround the circumferential sides of the discharge holes 23a and 23b.

Next, the operation of this embodiment will be explained.

When feeding fresh concrete from the hopper 2, the actuating rod 48a of one of the penetrating actuators 11a is extended, and the penetrating cylinder 10a is
Penetrate into hopper 2. With this, fresh concrete is taken into the penetration cylinder 10a from the tip 21a. At this time, the piston 12a remains stationary. Then, the penetration cylinder 10a is further extended, and its tip 21a is connected to the discharge pipe 24.
A is inserted and connected by fitting (penetration process).

Thereafter, the swing actuator 31 of the discharge pipe 5 is operated to connect the introduction end 28 of the discharge pipe 5 and the switching valve body 2.
6 is moved and connected to its discharge pipe 24a (valve switching).

Next, the pumping actuator a is extended to move the piston 12a toward the discharge pipe 5, and the fresh concrete taken into the penetration cylinder 10a is pumped into the discharge pipe 5 through the discharge hole 23a (pressing step). At this time, the pressure in the movement direction (axial direction) of the piston 12a applied to the discharge pipe 5 during pressure feeding is transmitted and supported at the bent portion 33 to the thrust bearing portion 36 via the support bracket 34 and the rotating shaft 35. In other words, most of the pressure in the axial direction is supported by the thrust bearing part 36, and the radial bearing 3
0's burden is reduced. Therefore, the radial bearing 30
The bearing function related to rocking is not adversely affected.

When the pressure feeding is completed, the swing actuator 31 is operated again to swing the discharge pipe 5 and the switching valve body 26 to close one discharge hole 23a and connect the introduction end 28 to the other discharge port 23b ( valve switching).

After that, the penetration cylinder 10a and the piston 12a
and are integrally removed from the hopper 2 and returned to the original position (return process).

Thereafter, the above steps are repeated to pump the fresh concrete. At this time, the two pumping devices 3 are operated alternately so that their operating processes overlap as appropriate, and during one pumping process, the return process and penetrating process of the other are completed.

In this way, the pressure feeding device 3 directly facing the discharge hole 23
and a discharge pipe 5 provided on the base 6 and having an introduction end 28 connected to the discharge hole 23 and bent as appropriate.
A radial bearing 29 connects the base end 29 of the discharge pipe 5 to any of the discharge holes 23 by supporting it rotatably around a horizontal axis eccentric to the discharge hole 23 and swinging it; and the radial bearing 29 and the discharge hole. 23, and a rotating shaft 35 coaxial with the horizontal axis, and a rotating shaft 35 attached to the bent portion 33 of the discharge pipe 5.
Since it is equipped with a thrust bearing part 36 having a support bracket 34 that rotates around it, it is possible to maintain high pumping efficiency without creating a cavity in the hopper 2, and even when the feeding pressure is high, it is possible to maintain a high pumping efficiency in the axial direction of the discharge pipe 5. The pressure along the hopper 4 is exclusively received by the thrust bearing part 36 located outside the hopper 4, and the radial bearing 30
The wall structure of the hopper 4 and the support structure of the discharge pipe 5 can be simplified, and durability can be improved.

Further, in this embodiment, since the wear ring 43 and the wear plate 44 are provided on the discharge pipe 24, the wear ring 43 is pressed against the wear plate 44 by the discharge pressure of fresh concrete or its head pressure, so that the wear ring 43 is pressed against the wear plate 44.
Its sealing performance is improved. Furthermore, wear ring 4
3 is made of a softer material than the wear plate 44, the wear ring 43 side is worn out due to the sliding between the wear plate 44 and the wear ring 43 as the switching valve body 26 swings, and a contact surface is formed. , the sealing performance is further improved.

Furthermore, if the contact between the switching valve body 26 and the valve seat 25 deteriorates due to sliding wear, tightening the nut 41 of the thrust bearing 36 will reduce the axial force of the rotating shaft 35. Therefore, the adhesion force between the valve seat 25 and the switching valve body 26 can be adjusted.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

A hopper having a plurality of discharge holes, a penetration cylinder provided directly opposite to the discharge holes, a piston that slides inside the penetration cylinder and force-feeds the object taken into the penetration cylinder to the discharge hole, and a hopper. A discharge pipe is installed on the outer base and bent as appropriate, and the base end of the discharge pipe is rotatably supported around a horizontal axis eccentric to the discharge hole and connected to one of the discharge holes by swinging it. The system is equipped with a radial bearing, which has a rotating shaft coaxial with the horizontal axis, and a thrust bearing, which has a support bracket that is attached to the bent part of the discharge pipe and rotates around the rotating shaft, so the pressure during pumping is high. Even in such a case, the reaction force can be appropriately received, and the support structure on the discharge pipe side can be simplified and its durability can be improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the pressure pump according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is the inside of Fig. 1. of-
5 is a front view of the switching valve body in FIG. 1, FIG. 6 is a front view of the valve seat in FIG. 1, and FIG. 7 is a partially cutaway view of a conventional pressure pump. The plan view and FIG. 8 are partially cutaway side views thereof. In the figure, 2 is a hopper, 5 is a discharge pipe, 6 is a base, 1
0 is a penetration cylinder, 12 is a piston, 23 is a discharge hole, 28 is an introduction end, 29 is a base end, 30 is a radial bearing, 33 is a bending part, 34 is a support bracket, 3
Reference numeral 6 indicates a thrust bearing portion, and b indicates fresh concrete as an object to be transported.

Claims (1)

[Scope of utility model registration request] A hopper having a plurality of discharge holes at the bottom and storing a transferred object, a plurality of penetration cylinders provided directly opposite the discharge holes and penetrating into or exiting the hopper, and a plurality of penetration cylinders that slide inside the penetration cylinders. a piston for force-feeding the object to be transferred taken into the hopper to the discharge hole; and a discharge pipe provided on a base outside the hopper and having an introduction end connected to the discharge hole and bent as appropriate. , a radial bearing that connects the base end of the discharge pipe to any of the discharge holes by supporting it rotatably around a horizontal axis eccentric to the discharge hole and swinging it; and the radial bearing and the discharge hole. and a thrust bearing section having a rotating shaft coaxial with the horizontal shaft and a support bracket attached to a bent portion of the discharge pipe and pivoting around the rotating shaft. pressure pump.