JPH0270983A - Valve case for piston type concrete pump - Google Patents

Abstract

PURPOSE:To enable completion of repair through exchange of only a locally worn rear case by a method wherein a case body is divided into a rear case to support a pair of pump cylinders and the rear upper part of a valve and a front case to support the front of the valve in cooperation with a support member. CONSTITUTION:A valve case 3 is formed with a case body 4 and a bottom cover 9 supported to the bottom part of the case body 4 so that it is downwardly rotatable around 25. The case body 4 is formed with a rear case 10 and a front case 11, and a division surface 20 between the rear and front cases 10 and 11 is caused to coincide with a joint surface 23 between a valve 8 and a mouthpiece 12 being a part of each of pump cylinders 5 and 5. When local wear occurs to a joint part between the engaging part of the valve 8 of the rear case 10 and the mouthpiece 12, by removing six bolts 14..., the rear case 10 can be moved from the front case 11 for exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a split valve case in a piston type concrete pump.

(b>Prior art) The valve case of a conventional piston-type concrete pump has a case body (01) and a bottom !1 (0), as shown in Figure 6.
2), and the case body (01) includes a rear case (01) that supports the rear upper part of the pump cylinder and the valve.
4) and had an integrated structure.

(C> Problems to be Solved by the Invention Due to the structure described above, if local wear occurs at the fitting part of the valve or the joint part with the pump cylinder in the rear case, local wear does not occur in the front case. However, there was a problem in that the entire case body had to be replaced.

Therefore, an object of the present invention is to divide the case body into a rear case and a front case so that only the rear case that has locally worn out needs to be replaced.

(d) Means for Solving the Problems The present invention has been made to solve the problems mentioned above, and has a pair of pump cylinders at the rear and a discharge pipe at the front, and has a pair of pump cylinders inside. A valve case is connected to the lower part of the hopper, and the valve case is swingably provided with valves that alternately communicate with each other and always communicate with the discharge pipe. In a piston-type concrete pump that discharges water, the valve case is composed of a case body and a bottom cover that is rotatably installed at the bottom of the case body, and the case body has a pair of pump cylinders and a valve. A rear case that supports the rear upper part of the valve, and a front case that supports the front of the valve together with a support member, and a dividing surface between the rear case and the front case joins the valve and a pair of pump cylinders. It is characterized by being made to substantially match the surface.

(e) Examples Embodiments of the present invention will be described below based on the drawings.

First, in Figures 1 and 2, (1) is a pump case with a rectangular cross section, a rental box (2) is welded to the rear end of this pump case (1), and a valve case (3) is welded to the front end of the pump case (1). ) is melted.

A pair of cylindrical pump cylinders (5) (5) are provided in parallel inside the pump case (1), and each end of each pump cylinder (5) (5) is connected to the center box (2) and the valve case. (3) It is designed to open inward.

Each pump cylinder (5) is attached to the pinta box (2).
Hydraulic cylinders (6) (6) are provided opposite to (5).

A hopper (7) is provided above the valve case (3), and a valve (8) is swingably provided inside.

As shown in FIGS. 3 to 5, the valve case (3) includes a case body (4) and a bottom N (9) which is pivotally supported (25) on the bottom of the case body (4) so as to be rotatable downward. ).

The case main body (4) is composed of a rear case (10) and a front case (11), and a dividing surface (20) between the rear case [10] and the front case (11) has a valve (9).
) and the cap (1) which is part of the pump cylinder (5) (5).
2) to coincide with the joint surface (23).

After positioning the rear case (10) and the front case (11) using the four bolts (13), insert the six bolts (14) into the rear case. It is firmly connected by tightening from the (4) side.

The rear upper part of the valve (8) passes through the rear case (10), a nut (15) is screwed into the rear part, and a bracket (15) is screwed into the rear upper part of the valve (8).
6) is connected to a hydraulic cylinder (17).

When the hydraulic cylinder (17) is driven, the valve (8) is swung to alternately communicate the pair of pump cylinders (5H5) with the discharge pipe (22) of the front case (11). There is.

In addition, the front part of the valve (8) is - of the front case (11).
The support member (19) together with the half-split support part (18) forming the
), the support member (19) is bolted to the support part (18), and the bottom cover (9)
The free ends of the can be joined with a pin (24).

Next, in order to pump the fresh concrete, the pair of hydraulic cylinders (6) (6) are actuated and the valve (8) is oscillated to suck the fresh concrete in the hopper (7) into the pump cylinder (5). With valve (8)
Fresh concrete can be delivered to the discharge pipe (22) through the discharge pipe (22).

Next, the fitting part and base of the valve (8) of the rear case (10) can be installed.

(``) Effects of the Invention As described above, in the present invention, the main body of the valve case is divided into a rear case and a front case, so that the only need to replace the valve case is to replace the rear case, which tends to wear locally. Further, since the case body is divided into two parts and the size thereof is reduced, the casting accuracy is improved and machining becomes easier.

[Brief explanation of the drawing]

Figure 1 is an overall view of a piston-type concrete pump equipped with the present invention, Figure 2 is a detailed sectional view of the vicinity of the valve case,
Fig. 3 is a front view of a single valve case, Fig. 4 is a view taken along arrow A-A in Fig. 3, Fig. 5 is a view taken along arrow B-8 in Fig. 3, and Fig. 6 is a single conventional valve case. FIG.

Claims (1)

[Claims] A valve case is provided at the bottom of the hopper, which has a pair of pump cylinders at the rear, a discharge pipe at the front, and a swingable valve inside which communicates alternately with the pair of pump cylinders and constantly communicates with the discharge pipe. In a piston-type concrete pump that is connected to the hopper and sucks in fresh concrete supplied to the hopper with a pump cylinder and discharges it into a discharge pipe via a valve, the valve case has a case body and a bottom portion of the case body that rotates downwardly. The case body is divided into a rear case that supports a pair of pump cylinders and a rear upper part of the valve, and a front case that supports the front of the valve together with a support member, and A valve case for a piston-type concrete pump, in which a dividing surface between a rear case and a front case substantially coincides with a joint surface between the valve and a pair of pump cylinders.