JPH0516997U - Bending boom type concrete pump truck - Google Patents

Abstract

(57) [Abstract] [Purpose] The bending boom 4 is installed along the outer bracket 7, the inner bracket 8 and the joint means 5 including the hollow support shaft 9 having the flange 10 at the outer end thereof. In a bending boom type concrete pump truck configured to feed fresh concrete from the base end side to the tip side of the bending boom 4 through the pipe 6, a fixing flange 12 fixed to one end of a steel pipe 11 is provided together with the flange 10 side. To improve the durability of the support portion of the steel pipe via the joint means 5 provided so as to be screwed to the outer bracket 7. [Structure] A steel pipe 13 having a fixing flange 12 on the outer periphery in the vicinity of its base end is passed through the hollow support shaft 9, and the fixing flange 12 is attached to one outer surface of the outer bracket 7 together with the flange 10 of the hollow support shaft 9. The ring-shaped metal fitting 14 fixed by screwing and fitted on the other end of the steel pipe 13 was screwed and fixed on the other outer surface of the outer bracket 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a folding boom type concrete pump car.

[0002]

[Prior Art]

 A description will be given based on FIGS. 2 and 3. A folding boom type concrete pump car is provided with a concrete pump and a swingable swivel base 3 on a frame 2 of a vehicle 1, and a bendable bending boom 4 is provided so as to be capable of undulating and connected to the swivel base 3. .. A bending boom 4 in which a base end portion of the other boom is foldably connected through a joint means 5 to a tip end portion of one boom is bent through a pipe 6 provided along the joint means 5. Fresh concrete is sent from the base end side of the boom 4 to the tip end side.

The lower joint means 5a includes a pair of left and right outer brackets 7 each having a spindle insertion hole provided at the left and right positions of the tip of one boom 4a so as to extend toward the tip of the boom 4a, and the other. An inner bracket 8 having a support shaft insertion hole provided at the base end of the boom 4b extending toward the base end of the boom 4b, and a hollow support shaft 9 having a flange 10 at its outer end, The inner bracket 8 is positioned between the pair of left and right outer brackets 7 and the hollow support shaft 9 is attached to the outer side of the pair of left and right outer brackets 7 in a state where the support shaft insertion holes of the outer bracket 7 and the inner bracket 8 are overlapped. Has been inserted from. The outer bracket 7 is provided with a screw hole, and the flange 10 is provided with a hole so as to be screwed together with a fixing flange 12 which will be described later. The upper joint means 5b has the same structure as the joint means 5a except that the boom 4b is used as one boom and the boom 4c is used as the other boom.

The passage portion of the joint means 5 in the pipe 6 is a steel pipe 11 having a fixed flange 12 on the outer periphery in the vicinity of the base end portion thereof, and both ends thereof are formed into a stepped shape to allow a catching margin of the joint. And the fixed flange 12 having a hole for screwing after passing through the hollow support shaft 9 is screwed and fixed to one outer surface of the outer bracket 7 together with the flange 10 of the corresponding hollow support shaft 9. Are configured. That is, the support of the steel pipe 11 has a cantilever structure. The end of the steel pipe 11 protruding from one of the left and right outer brackets 7 is connected to the pipe 6a along the one boom 4a side by a joint, and the end of the steel pipe 11 protruding from the other outer bracket 7 is connected. The terminal is connected to a pipe 6b provided along the other boom 4b by a rotary joint.

In the bending boom type concrete pump car configured as described above, the fresh concrete received from the concrete mixer car or the like is sent to the pipe 6 by the concrete pump on the frame 2. The pipe 6 passes through the swivel base 3 and is installed along the boom 4a. The pipe 6a is connected through the joint means 5a. The pipe 6b is installed along the boom 4b. The steel pipe 11 is passed through the connection means 5b and the boom 4c. Since the concrete is connected to and communicates with the pipe 6c provided alongside, the ready-mixed concrete is pumped from the concrete pump to the tip of the bending boom 4. A hose is connected to the tip of the bending boom 4 and is appropriately extended to a concrete pouring place to transfer the fresh concrete to the pouring place.

The bending boom type concrete pump truck is very convenient because the fresh concrete received from the concrete mixer truck or the like can be easily moved by power to a concrete placing location at a vertical or horizontal distance. Therefore, it is indispensable for pouring concrete.

[0007]

[Problems to be solved by the device]

 Concrete pumps generate pulsation due to their structure, and ready-mixed concrete has a large specific gravity and variations. Therefore, the pipe 6 constantly vibrates during the operation of the concrete pump. Since the supporting portion of the steel pipe 11 has a cantilever structure and is repeatedly subjected to vibration, the durability of the supporting portion is low and there is a problem that it must be replaced in a short period of time. An object of the present invention is to provide a support portion for a steel pipe 11 having excellent durability that can solve this problem.

[0008]

[Means for Solving the Problems]

 A folding boom type concrete pump car, in which a bending boom in which one end of one boom is foldably connected to the other end of the boom via joint means is used to connect the boom to the joint boom via the joint means. Ready concrete is fed from the base end side of the bending boom to the tip side through the installed pipe, and the joint means is provided at the left and right positions of the end portion of one boom and extends to the end side of the boom. A pair of left and right outer brackets that have the support shaft insertion hole, an inner bracket that has a support shaft insertion hole that extends to the end side of the boom at the end of the other boom, and a flange at the outer end. A pair of left and right outer brackets in which the inner bracket is positioned between the pair of left and right outer brackets and the support shaft insertion holes of the outer bracket and the inner bracket are overlapped with each other. At least one hollow support shaft fitted from the outer side of the pipe, and a steel pipe having a fixing flange on the outer periphery near the base end portion of the passage portion of the joint means in the pipe. Then, the fixing flange is configured to be screwed and fixed to one outer surface of the outer bracket together with the flange of the corresponding hollow spindle after penetrating the hollow spindle, and is externally fitted to the other end of the steel pipe. The ring-shaped metal fitting was screwed and fixed to the other outer surface of the outer bracket.

[0009]

[Action]

 The ready-mixed concrete, which is received from a concrete mixer truck or the like and sent into the pipe 6 by the concrete pump, is sent to the tip of the bending boom 4 through the swivel base 3, the connected pipe 6 and the communicating pipe 6.

The steel pipe located in the middle of the pipe 6 and passing through the joint means 5 vibrates due to the pumping of the fresh concrete, but the support portion of the conventional steel pipe 11 has a cantilever structure on one end side. On the other hand, in the present invention, since the structure is such that the steel pipe is supported on the other end side as well, the vibration of the supporting portion of the steel pipe is suppressed as compared with the conventional one.

When replacing the steel pipe, after removing the joints at both ends of the steel pipe and shifting the pipe 6, the left and right outer brackets 7 are loosened with screws and the ring-shaped metal fittings are removed from the steel pipe. It can be removed from the hollow spindle 9.

[0012]

【Example】

 A description will be given based on FIGS. 1 and 2. Reference numerals 1 to 10, 12, 4a, 4b, 4c, 5a, 5b, 6a, 6b, 6c, and A described with reference to FIGS. 2 and 3 as a conventional technique have the same meaning, and the description thereof will be omitted. To use.

Reference numeral 13 is a steel pipe, and 14 is a ring-shaped metal fitting. The steel pipe 13 has a stepped shape at both ends due to the engagement allowance of the joint, and the outer diameter of the position where the ring-shaped metal fitting 14 is externally fitted is smaller than the inner diameter of the hollow support shaft 9 and the stepped shape at both ends. The outer diameter of the part is equal to or larger than the outer diameter. The ring-shaped metal fitting 14 is externally fitted to the other end of the steel pipe 13 and has a hole so that it can be screwed to the other outer surface of the outer bracket 7.

A structure in which fresh concrete is fed from the base end side to the tip side of the bending boom 4 through a pipe 6 provided along the bending boom 4 via a joint means 5, and The configuration of the means 5 is as described above as the conventional technique, and thus the description thereof is omitted.

The passage part of the joint means 5 in the pipe 6 is a steel pipe 13 having a fixed flange 12 on the outer periphery in the vicinity of the base end part thereof, which is passed through the hollow support shaft 9 and then screwed. A ring-shaped metal fitting in which the fixing flange 12 provided with a hole for use is screwed and fixed to one outer surface of the outer bracket 7 together with the corresponding flange 10 of the hollow support shaft 9 and is externally fitted to the other end of the steel pipe 13. The outer bracket 7 is screwed and fixed to the other outer surface of the outer bracket 7. That is, the support of the steel pipe 13 has a structure in which one end is fixed and the other end is supported. One end of the outer side of the outer bracket 7 of the steel pipe 13 is connected to the pipe 6a along the one boom 4a side by a joint, and the other end of the outer bracket 7 of the steel pipe 13 is connected by a rotary joint. It is connected to a pipe 6b provided on the side of the other boom 4b.

In the bending boom type concrete pump truck configured as described above, the raw concrete fed from the concrete mixer truck or the like into the pipe 6 by the concrete pump is connected and communicated via the swivel base 3. It is sent to the tip of the bent boom 4 through the pipe 6.

The steel pipe 13 located in the middle of the pipe 6 and passing through the joint means 5 vibrates due to the pumping of the fresh concrete, but the conventional support portion of the steel pipe 11 has a cantilevered structure on one end side by the fixed flange 12. On the other hand, in addition to this, because the structure is such that the steel pipe 13 is supported by the ring-shaped metal fitting 14 that is also fitted on the other end side, the vibration of the support part of the steel pipe 13 , Can be kept small.

When replacing the steel pipe 13, after removing the joints at both ends of the steel pipe 13 and displacing the pipe 6, the left and right outer brackets 7 are loosened and the ring-shaped metal fitting 14 is removed from the steel pipe 13. When pulled out, the steel pipe 13 can be pulled out from the hollow support shaft 9 and removed. The outer diameter of the position where the ring-shaped metal fitting 14 of the steel pipe 13 is externally fitted is smaller than the inner diameter of the hollow support shaft 9 and equal to or larger than the outer diameter of the stepped portion at both ends, so that the ring-shaped metal fitting 14 does not interfere. Can be inserted and removed. To install the steel pipe 13, reverse the procedure for removing it.

When the ring-shaped metal fitting 14 is divided into halves, the outer diameter of the position where the ring-shaped metal fitting 14 of the steel pipe 13 is externally fitted does not exceed the outer diameter of the stepped portion at both ends. I don't mind.

Further, although the hollow support shaft 9 is shown as two left and right divided pieces, it may be inserted from one side on the outside of the outer bracket 7 as one piece.

Further, the outer bracket 7 and the inner bracket 8 in the joint means 5 have an inner bracket 8 having a spindle insertion hole provided at the tip of one boom 4a and extending toward the tip of the boom 4a, and the other. Alternatively, a pair of left and right outer brackets 7 may be provided at the left and right positions of the base end portion of the boom 4b, the support shaft insertion holes extending to the base end side of the boom 4b.

[0022]

[Effect of the device]

 With a simple support structure that only adds simple ring-shaped metal fittings, by suppressing the vibration of the steel pipe that passes through the joint means, the durability of the support part of the steel pipe can be dramatically improved, which is very effective. It is a thing. It is also very tough because it is easy to replace the steel pipe.

[Brief description of drawings]

FIG. 1 is a sectional view taken along arrow A showing a steel pipe supporting structure of joint means in a concrete pump car of the present invention.

FIG. 2 is an explanatory view of a folding boom type concrete pump car.

FIG. 3 is a sectional view taken along arrow A showing a steel pipe support structure of joint means in a conventional concrete pump truck.

[Explanation of symbols]

 4 Bending boom 5 Joint means 6 Piping 7 Outer bracket 8 Inner bracket 9 Hollow spindle 10 Flange 12 Fixed flange 13 Steel pipe 14 Ring fitting

Claims (1)

[Scope of utility model registration request] 1. A bending boom in which an end portion of one boom is foldably connected to an end portion of the other boom via joint means, through a pipe provided along the joint means,
A folding boom type concrete pump car configured to feed fresh concrete from the base end side to the tip side of the bending boom, and in particular, the joint means is provided at the left and right positions of one boom end side. A pair of left and right outer brackets each having a spindle insertion hole extending to the boom, an inner bracket having a spindle insertion hole extending to the end of the boom at the end of the other boom, and A hollow support shaft having a flange at an outer end, wherein the inner bracket is positioned between the pair of left and right outer brackets, and the support shaft insertion holes of the outer bracket and the inner bracket are overlapped with each other. At least one hollow support shaft fitted from the outer side of the pipe, and the outer peripheral portion near the base end portion of the joint portion of the pipe. A steel pipe having a fixing flange, which is formed by penetrating the hollow support shaft and then fixing the fixing flange together with the flange of the corresponding hollow support shaft by screwing to one outer surface of the outer bracket, and A bending boom type concrete pump car, characterized in that a ring-shaped metal fitting fitted to the other end is fixed to the other outer surface of the outer bracket by screwing.