JPH11321727A - Extracting device and method for connection pin in construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extracting device and method for a connection pin in a construction machine capable of quickly and easily extracting the connection pin. SOLUTION: A connection pin 4 inserted from pin holes 21, 28 of a first member 1, which is a constitutional member of a construction machine, is inserted into a pin hole 29 of a second member 3, so as to connect the first and second members 1, 3. A slit 4a or a constriction part buried partially in the pin holes 27, 28 of the first member 1 in a connection condition is provided in the connection pin 4. A wedge, which is press-fitted to a part exposed to the outside from the pin hole 28 of the first member 1 in the slit 4a or the constriction part to extract the connection pin 4, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extracting device and an extracting method of a connecting pin for connecting components in a construction machine such as a crane and a hydraulic shovel.

[0002]

2. Description of the Related Art When a crane is transported, if it is relatively large, as shown in FIGS. 10A and 10B, a jack 21 attached to the truck frame 1 is extended and the truck frame 1 is extended. The crawler 2 is lifted from the crawler 2, the craws 2 are suspended by another crane, the crawlers 2 on both sides are detached from the track frame 1, and the jack 21 attached to the track frame 1 is further extended, so that the turning device 22 and the upper part of the The portion of the revolving structure 23 is made higher, and the bed 24 of the trailer truck is sunk under it. The jack 21 is contracted again, and the portion of the truck frame 1 or more of the crane is placed on the bed 24.

In such transportation, the crawler 2 is attached to and detached from the track frame 1, so that the crawler 2 shown in FIG.
As shown in (1), both ends of the track frame 1 are inserted into holes 3a provided in a side frame 3 which is a framework of the crawler 2, and have a structure of being detachably connected by connecting pins 4. The track frame 1 is formed in a box shape by an upper plate 1a, a lower plate 1b, and both side plates 1c.
d and a reinforcing plate 1e. The connecting pins 4 are attached by inserting them into pin holes 27 and 28 provided in the middle plate 1 d and the lower plate 1 b of both ends of the track frame 1 and pin holes 29 provided in the side frame 3.

At the time of transportation, as shown in FIGS. 11A and 11B, the connecting pin 4 is pulled out from the pin hole 29 of the side frame 3, and the bar 30 is placed above the support plate 31 attached to the intermediate plate 1d. Hole a and the reinforcing plate 1 of the track frame 1
e, and the connecting pin 4 is supported by passing it through an upper hole b provided in an upper end of the connecting pin 4 and an eyebolt 32 attached to the upper end of the connecting pin 4. In this state, the track frame 1 is inserted into and removed from the hole 3 a of the side frame 3. . In addition, the connecting pin 4 is
In the state where the connecting pins 4 are inserted into the holes 9 and 9, as shown in FIG. 11B, in order to prevent the connecting pins 4 from coming out, the bar 30 is connected to the holes c and d below the supporting plate 31 and the reinforcing plate 1e. The eye bolt 32 is inserted.

When pulling out the connecting pin 4,
The middle part of the bar 30 is inserted into the hole e below the hole of the support plate 31, one end of the bar 30 is inserted into the eyebolt 32, and the other end of the bar 30 is pushed down, so that the connecting pin 4
Is pulled out by a predetermined length, and then the bar 30 is pulled out and put into the upper hole f, and the bar 3
By 0, the connecting pin 4 is pulled out by a predetermined length.

[0006]

As described above, the conventional operation of extracting the connecting pin 4 is performed by the support plate 3 into which the bar 30 is inserted.
Since the positions of the holes e and f are changed and the holes are extracted using the principle of leverage, there is a problem that it takes time to extract the connecting pin 4 to the final position.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an apparatus and a method for extracting a connecting pin in a construction machine in which the connecting pin can be quickly and easily extracted.

[0008]

In order to achieve this object, according to the first aspect of the present invention, a connecting pin inserted from a pin hole of a first member which is a component of a construction machine is inserted into a pin hole of a second member. By doing so, in the connecting pin extraction device in the construction machine that connects the first and second members, the connecting pin has a slit or a constricted part that is partially buried in the pin hole of the first member in the connected state. And a wedge for press-fitting a portion of the slit or the constricted portion exposed to the outside from a pin hole of the first member to extract the connection pin.

According to the first aspect of the present invention, the connecting pin can be quickly pulled out by pressing a wedge into the slit or the constricted portion with a tool such as a hammer.

According to a second aspect of the present invention, there is provided a construction for connecting a first member and a second member by inserting a connecting pin inserted from a pin hole of a first member, which is a constituent member of a construction machine, into a pin hole of a second member. In a connecting pin extracting device of a machine, in a connected state, the connecting pin has a structure in which a gap is formed between a head of the connecting pin and a first member, and a wedge for press-fitting the gap and extracting the connecting pin. It is characterized by having.

According to the second aspect, the connection pin can be quickly pulled out by press-fitting a wedge with a tool such as a hammer into a gap formed between the head of the connection pin and the first member.

According to a third aspect of the present invention, there is provided a construction for connecting a first member and a second member by inserting a connecting pin inserted from a pin hole of a first member, which is a constituent member of a construction machine, into a pin hole of a second member. In the method of extracting a connecting pin in a machine, a slit or a constricted portion that is partially buried in a pin hole of the first member in a connected state is provided on the connecting pin, and the first of the slit or the constricted portion is provided. A wedge is press-fitted into a portion of the member exposed to the outside from the pin hole, and the connection pin is extracted.

According to a third aspect of the present invention, a wedge is pressed into a portion of the slit or the constricted portion exposed to the outside from a pin hole of the first member, and the connecting pin is pulled out.
The connecting pin can be quickly pulled out.

According to a fourth aspect of the present invention, there is provided a construction for connecting a first member and a second member by inserting a connecting pin inserted through a pin hole of a first member, which is a constituent member of a construction machine, into a pin hole of a second member. In a method of extracting a connecting pin in a machine, a gap is formed between a head of the connecting pin and a first member in a connected state, and a wedge is pressed into the gap to extract the connecting pin. And

According to a fourth aspect of the present invention, the wedge is press-fitted into a gap provided between the head of the connecting pin and the first member.
The connecting pin can be quickly pulled out.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus for carrying out a method for extracting a connecting pin according to the present invention, which comprises connecting a track frame (first member) 1 and a side frame (second member) 3 of the crane to a connecting pin 4. Side view showing the part connected by
FIG. 2 is a cross-sectional view taken along the line EE of FIG. 1, and FIG. 3 is a cross-sectional view showing a state where the connecting pin 4 is extracted.

1 to 3, an opening 3a for inserting the track frame 1 in the side frame 3 is formed by an upper plate 3b, a lower plate 3c, and both side plates 3d. The connecting pin 4 is provided with a slit 4a in the longitudinal direction. The slit 4a is provided in a pin hole 28 provided in the lower plate 1b of the track frame 1 when the connecting pin 4 connects the track frame 1 and the side frame 3. Is provided at a position where a part of the slit 4a is buried. In the connection state by the connection pin 4, a hole 4b is provided at a position near the lower surface of the intermediate plate 1d, and the retaining pin 5 is provided in the hole 4b.
Is inserted.

Connect the connecting pin 4 to the lower plate 3b of the side frame 3.
When the track frame 1 is to be removed from the side frame 3 by extracting the track frame 1 from the pin hole 29, as shown in FIG.
Using a tool such as a hammer, a tapered wedge 6 having a tip whose width is slightly smaller than the vertical width of the exposed portion of the slit 4a is press-fitted into a portion exposed upward from the lower plate 1b of the slit 4a, thereby connecting. The pin 4 is pulled out from the pin hole 29.
Thereby, the track frame 1 can be extracted from the opening 3a of the side frame 3. Wedge 6 is slit 4
By keeping the connection pin 4 press-fitted into the pin a, it is possible to keep a state in which the connecting pin 4 does not project from the pin hole 28 of the lower plate 1b of the track frame 1 to the lower surface.

As described above, by pulling out the connection pin 4 by press-fitting the wedge 6, the connection pin 4 can be easily and quickly pulled out.

The slits 4a are provided not only in one direction, but by arranging a plurality of the slits 4a in the circumferential direction of the connecting pin 4 so that the slit 4a is formed from any direction even if the direction of the connecting pin 4 changes. The wedge 6 can be press-fitted. In order to fix the slit 4a in the outward direction, a means for fixing the direction of the connecting pin 4 between the connecting pin 4 and the track frame 1 may be provided.

FIG. 4A is a side view showing another embodiment of the present invention, FIG. 4B is a perspective view showing a connecting pin and a wedge in this embodiment, and FIG. It is sectional drawing which shows the extraction state.

In this embodiment, as shown in FIG. 4B, a constricted portion 4c is provided on the outer periphery of the connecting pin 4 instead of the slit 4a so that the wedge 6A fits in the constricted portion 4c. It is a bifurcated shape. Also in this case, as shown in FIG. 4A, in the connection state by the connection pin 4, the constricted portion 4c is located at a position where a part of the constricted portion 4c is buried in the pin hole 28 provided in the lower plate 1b of the track frame 1. Is provided.

As shown in FIG. 5, when pulling out the connecting pin 4, the wedge 6A is fitted into the constricted portion 4c and press-fitted with a tool such as a hammer (as shown in FIG. 3, the plate-shaped wedge 6 is inserted into one side). By press-fitting into the gap G), the connecting pin 4 can be quickly and easily extracted from the pin hole 29 as in the above-described embodiment.

FIG. 6A is a side view showing another embodiment of the present invention, FIG. 6B is a perspective view showing a connecting pin and a wedge in this embodiment, and FIG. It is sectional drawing which shows the extraction state.

In the present embodiment, as shown in FIG. 6B, projecting pieces 4e projecting downward (one side may be provided) are provided on both sides of the head 4d of the connecting pin 4 so as to provide a structure as shown in FIG.
As shown in (A), in the connection state by the connecting pin 4, the tip of the projecting piece 4 e abuts on the middle plate 1 d of the track frame 1, whereby the head 4 d of the connecting pin 4 and the middle plate 1
6D, a gap G is formed between the connecting pin 4 and the shaft G of the connecting pin 4 as shown in FIG.
It is also formed in a shape.

As shown in FIG. 7, when pulling out the connecting pin 4, a wedge 6B is inserted into the gap G, that is, between the head 4d of the connecting pin 4 and the middle plate 1d, and pressed with a tool such as a hammer. By doing so, the connecting pin 4 can be quickly and easily extracted from the pin hole 29 as in the above-described embodiment.

FIG. 8 shows, as means for forming the gap G in the embodiment of FIG. 6, a head 4f of the connecting pin 4 is supported on both sides (or one side) of the connecting pin 4 on the upper surface of the intermediate plate 1d. In this embodiment, as shown in FIG. 9, the wedge 6B shown in FIG. 6B is inserted into the gap G below the head 4f of the connecting pin 4 with a hammer or the like. By press-fitting (the plate-shaped wedge 6 may be press-fitted into one of the gaps G as shown in FIG. 3), the connecting pin 4 can be quickly and easily extracted.

The structure in which the gap G is provided below the head 4f can also be realized by providing the receiving member 8 for receiving the tip of the connecting pin 4 on the side frame 3, as shown by the two-dot chain line in FIG. .

The present invention is not limited to the connection pin 4 between the side frame 3 and the track frame 1 in a crane or a hydraulic excavator, and it is difficult to pull out the connection pin because the connection pin is galling or is heavy. It can be used in various places of other construction machines such as an excavator.

[0030]

According to the present invention, the connecting pin can be quickly and easily extracted by press-fitting the wedge into the slit or the constricted portion of the connecting pin or the gap provided between the head and the first member. it can. Further, the present invention can be implemented with a relatively simple structure.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an apparatus for carrying out a method for extracting a connecting pin according to the present invention, with respect to a portion connecting a track frame (first member) and a side frame (second member) of a crane with a connecting pin. FIG.

FIG. 2 is a sectional view taken along line EE of FIG.

FIG. 3 is a cross-sectional view showing a state where a connecting pin is extracted in the embodiment of FIGS. 1 and 2;

FIG. 4A is a side view showing another embodiment of the present invention, and FIG. 4B is a perspective view showing a connecting pin and a wedge according to this embodiment.

FIG. 5 is a sectional view showing a state in which a connecting pin is extracted in the embodiment of FIG. 4;

FIG. 6A is a side view showing another embodiment of the present invention, and FIG. 6B is a perspective view showing a connecting pin and a wedge according to this embodiment.

FIG. 7 is a sectional view showing a state in which a connecting pin is extracted in the embodiment of FIG. 6;

FIG. 8 is a side view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing a state in which a connecting pin is extracted in the embodiment of FIG. 8;

FIG. 10A is a side view for explaining transport of a conventional crane, and FIG. 10B is a front view showing disassembly and assembly during transport of the conventional crane.

11 (A) is a partial cross-sectional front view showing a connecting structure of a conventional crane using a connecting pin for connecting a track frame and a side frame, and FIGS. 11 (B) and 11 (C) show the connecting structure in a pin pulled-out state; It is a perspective view shown about the connection state by.

[Explanation of symbols]

1: track frame, 2: crawler, 3: side frame, 4: connecting pin, 4a: slit, 4c: constricted portion, 4d, 4f: head, 4e: projecting piece, 5: retaining pin,
6, 6A, 6B: wedge, 7: table, 8: receiving member, 27-2
9: Pin hole, G: Clearance

Claims (4)

[Claims] 1. A connecting pin of a construction machine for connecting a first member and a second member by inserting a connecting pin inserted from a pin hole of a first member, which is a component member of the construction machine, into a pin hole of a second member. In the extraction device, the connection pin is provided with a slit or a constricted portion that is partially embedded in the pin hole of the first member in a connected state, and is provided outside the pin hole of the first member in the slit or the constricted portion. A connection pin extracting device for a construction machine, comprising a wedge for press-fitting the connecting pin and extracting the connecting pin. 2. A connecting pin of a construction machine for connecting a first member and a second member by inserting a connecting pin inserted from a pin hole of a first member, which is a constituent member of the construction machine, into a pin hole of a second member. In the removal device, in a connected state, a gap is formed between a head of the connection pin and the first member, and a wedge is provided to press-fit the connection pin and pull out the connection pin. Extraction device for connecting pins of construction machinery. 3. A connection pin of a construction machine for connecting a first member and a second member by inserting a connection pin inserted from a pin hole of a first member, which is a component member of the construction machine, into a pin hole of a second member. In the extracting method, a slit or a constricted portion that is partially buried in the pin hole of the first member in a connected state is provided on the connecting pin, and the slit or the constricted portion is provided with a slit or a constricted portion. A method for extracting a connecting pin of a construction machine, comprising inserting a wedge into a portion exposed to the outside and extracting the connecting pin. 4. A connecting pin of a construction machine for connecting a first member and a second member by inserting a connecting pin inserted from a pin hole of a first member, which is a component member of the construction machine, into a pin hole of a second member. In the extraction method, in the connection state, a gap is formed between the head of the connection pin and the first member, and a wedge is pressed into the gap to extract the connection pin. How to pull out the connecting pin.