JP2016069838A - Pin connection device, construction machine with pin connection device, and pin retaining tool for pin connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin connection structure for connecting two members overlapped in a vertical or horizontal direction that offers high pin fall-off prevention effect.SOLUTION: A pin connection structure is for connecting a swing bracket to an upper frame that constitutes a revolving superstructure of a shovel, with upper and lower vertical connection pins. A pin retaining tool 36 is fitted on a lower boss part 26, assuming that a lower connection pin 34 is inserted in an upward direction from below and capped with a lock pin 31 at a top edge for preventing fall-off. The pin retaining tool 36 is U-shaped having a pair of upper and lower holding plates 37, 38, and a lower edge surface of the connection pin 34 that passes through a pin insertion hole 40 of the upper holding plate 37 is received and supported by a pin receiving surface 41 of the lower holding plate 38.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a pin coupling device that couples two members such as an upper frame and a swing bracket of a swing excavator with a coupling pin, a construction machine with the device, and a pin holder used as a pin retaining means in the pin coupling device. Is.

  The background art will be described using a swing excavator as an example.

  As shown in FIG. 11, the excavator is mounted on a crawler-type lower traveling body 1 so that an upper swing body 2 can swing around an axis O perpendicular to the ground. A work attachment 10 including a boom 4, an arm 5, a bucket 6, and boom, arm, and bucket cylinders (hydraulic cylinders) 7, 8, and 9 for operating the boom 4, the arm 5, and the bucket 6 is attached to the front portion of the frame 3.

  In FIG. 11, 11 is a driver seat provided on the upper swing body 2, and 12 is a canopy that covers the driver seat 11 from above.

  In this specification, “front and rear” and “left and right” refer to directions viewed from an operator sitting in the driver's seat 11.

  Here, in the swing type excavator, a swing bracket 13 is pin-connected to the front portion of the upper frame 3 so as to be able to swing left and right around a vertical axis, and the base end portion of the work attachment 10 (boom 4) is connected to the swing bracket 13. It is attached by a boom foot pin 14.

  In addition, the boom cylinder 7 is attached between the boom 4 and the swing bracket 13, and a swing cylinder (not shown) that swings the swing bracket 13 is attached between the upper frame 3 and the swing bracket 13.

  The above configuration is shown in Patent Document 1.

  The structure for attaching the swing bracket 13 to the upper frame 3, that is, the structure of a conventional pin coupling device will be described with reference to FIGS.

  At the front of the upper frame 3, horizontal plate-like upper and lower side connecting portions 15 and 16 are provided in parallel with a gap, and the pin holes 17 and 18 (see FIG. It is provided in a state located on a straight line.

  The swing bracket 13 is formed by molding, and a boom foot mounting portion 19 is provided at the upper end portion, a boom cylinder mounting portion 20 is provided at the middle portion in the vertical direction of the front surface, and connecting portions 21 and 22 are provided on both upper and lower sides of the rear surface portion. It is done.

  The upper and lower side connecting portions 21 and 22 are formed in a U shape having a pair of upper and lower boss portions 23, 24, 25, and 26 that face each other with a space therebetween, and are identical to the boss portions 23 to 26. Pin holes 27, 28, 29 and 30 are provided on the vertical line.

  Further, the upper boss portion 25 of the lower connecting portion 22 is provided with a lock pin hole 32 through which the lock pin 31 shown in FIGS.

  In addition, in order to avoid complication of a figure, the code | symbol of each boss | hub parts 23-26 and the pin holes 27-30 is attached | subjected only to FIG. 13, and is abbreviate | omitting in another figure.

  When attaching the swing bracket 13, as shown in FIGS. 14 and 15, the upper and lower side connecting parts 22 and 23 of the swing bracket 13 are sandwiched between the upper and lower side connecting parts 15 and 16 and the boss parts are sandwiched between them. In this state, the upper connecting pin 33 is inserted into the pin holes 17, 27, 28 of the upper connecting portions 15, 22, and the lower connecting pin 34 is inserted into the pin holes 18, 29, 30 of the lower connecting portions 16, 23, respectively. insert.

  In this case, since the upper connecting pin 33 has a wide empty space above the connecting portion, it may be inserted from above using a headed pin provided with a head 33a as shown.

  On the other hand, unlike the upper connection pin 33, the lower connection pin 34 cannot be inserted from above because the distance between the upper and lower side connection portions 22 and 23 is shorter than the pin length.

  Therefore, the lower connecting pin 34 is inserted upward from below the connecting portion as shown in the figure, and the lock pin 31 is inserted in the insertion end portion (upper end portion) in the diametrical direction to prevent the lower connecting pin 34 from coming off. ing. In FIG. 14, reference numeral 35 denotes a lock pin hole provided at the upper end portion of the lock pin 31.

  The lock pin 31 may be a round shaft pin with a head fixed by a not-shown split pin, or a bolt fixed by a nut.

JP 2004-68958 A

  However, according to the above prior art, since the lower connecting pin 34 is held only by the lock pin 31 (preventing falling of its own weight), there is a problem that if the lock pin 31 is broken, it is dropped.

  In this case, the swing bracket 13 is held by the remaining upper connecting pin 33 and can swing around the pin, so that the swing bracket 13 may be overlooked as it is, and then the swing bracket 13 or the upper frame 3 Since there is a possibility of more serious damage such as damage, the above problems have been awaited.

  In addition, the above problem is likely to occur when there is a possibility that the two parts are connected by the vertical connecting pins, particularly when the connecting pins may fall by their own weight as in the exemplified swing bracket mounting part. However, there is a possibility that this may occur when a headed connecting pin is inserted from above or when two members are connected in a horizontal direction.

  Accordingly, the present invention provides a pin coupling device having a high effect of preventing the falling of the coupling pin, a construction machine with the pin coupling device, and a pin holder for the pin coupling device in a structure in which two members are coupled in the vertical and horizontal directions. To do.

  As means for solving the above problems, the invention of claim 1 (pin coupling device) has all the following requirements (i) to (vi).

  (i) A connecting portion having a pin hole is provided in both the first and second members to be phase-connected.

  (ii) The connecting portions are connected to each other by a connecting pin in a state where the connecting portions are overlapped in the vertical direction or the horizontal direction so that the pin holes are coincident with each other.

  (iii) It has a pin holder which prevents one axial movement of the connecting pin.

  (iv) The pin holder includes a pair of sandwiching plates facing each other at an interval, and a pin through hole is provided in one sandwiching plate, and a pin receiving surface is provided in the other sandwiching plate.

  (v) The pin holder is attached to one of the connecting portions in a state where the connecting portion is sandwiched between the holding plates.

  (vi) The connecting pin is inserted into the pin holes of both connecting portions in a state where one end face is received by the pin receiving surface through the pin through hole.

Here, in the invention of claim 2,
(A) A state in which the first and second members are each provided with a connecting portion having a pin hole penetrating in the vertical direction, and the connecting portions are overlapped in the vertical direction so that the pin holes coincide with each other. Configured to be connected by a connecting pin,
(B) The pin holder is attached to the lower connecting portion in the superimposed state,
(C) Of the two holding plates of the pin holder, the pin holding hole is provided on the upper holding plate in the mounted state, and the pin receiving surface is provided on the lower holding plate.

  According to the above configuration, since one axial movement of the connecting pin can be prevented by the pin receiving surface, the other axial movement preventing means (other retaining means such as the head of the connecting pin and the lock pin) By using together, it is possible to prevent the axial movement of both of the connecting pins and to prevent them from falling off.

  For example, when two members are vertically connected by a vertical connecting pin as in claim 2, the connecting pin is inserted from below and is prevented from coming off by a lock pin inserted at the upper end, that is, the drop-off is In the case where the configuration that is most likely to occur is taken, even if the lock pin breaks, the connection pin can be received by the pin receiving surface of the pin holder to reliably prevent the fall.

  That is, the effect of preventing the connecting pin from falling off can be enhanced.

  Further, in the configuration of claim 2, there is a risk that the pin will fall by its own weight in a state before insertion of the lock pin at the time of assembly or a state after removal of the lock pin at the time of disassembly, that is, a state in which the connecting pin is not retained. Therefore, work safety and efficiency are improved.

  In this case, the pin that has the pin receiving surface of the pin holder having only one end surface of the connecting pin received by the pin receiving surface is exposed to the outside opposite to the pin receiving surface. It is desirable to provide a punching operation hole (claim 3).

  In this way, regardless of whether the connecting pin is passed vertically or horizontally, the connecting pin can be easily pulled out by hitting the end surface of the pin viewed from the pin pulling operation hole with a hammer or the like when removing the connecting pin. it can.

  On the other hand, the invention of claim 4 (construction machine with a pin coupling device) includes a lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body, and an upper frame that constitutes the upper revolving body. A swing bracket that is swingably mounted to the left and right by a pin connecting device, and a work attachment that is attached to the swing bracket. The upper frame has upper and lower side connecting portions with pin holes facing each other at intervals in the vertical direction. On the other hand, the swing bracket is provided with both upper and lower connecting portions composed of upper and lower boss portions with pin holes, and the upper frame is connected to the upper frame between the upper boss portions of the swing bracket. Between the bosses of the lower connecting part of the swing bracket. 3. The pin connection according to claim 2, wherein the upper frame is connected to the upper frame in a construction machine with a pin connection device that connects the upper connection portions and the lower connection portions with both the upper and lower connection pins in a state where the connection portions are sandwiched. The first member in the apparatus, the swing bracket as the second member, and the pin holder by the pin receiving surface at least on the lower boss portion of the lower connection portion of the upper and lower side connection portions of the swing bracket. The swing pin is configured to be mounted while receiving the lower end surface of the swing pin.

  According to this configuration, when the swing excavator is configured to attach the work attachment to the upper frame of the upper swing body via the swing bracket, and the swing bracket is connected to the upper frame by two vertical connection pins. In addition, by attaching the pin holder to the lower boss part of the lower connection part of the swing bracket, it is possible to prevent the lower connection pin from falling by its own weight and to prevent serious accidents such as damage to the swing bracket or upper frame. It can be avoided.

In the invention of claim 5 (pin holder), the connecting portions with pin holes provided in the first and second members to be connected to each other are arranged in the vertical direction or horizontally so that the pin holes coincide with each other. A pin that is used in a pin coupling device that couples the first and second members by inserting a coupling pin into the pin hole in a state of being overlapped in the direction, and prevents one axial movement of the coupling pin A holding tool,
(I) provided with a pair of clamping plates facing each other at an interval,
(II) A pin through hole allowing passage of the connecting pin is provided in one of the holding plates, and one end surface of the connecting pin passing through the pin through hole is received in the other holding plate. Each pin receiving surface is provided,
(III) The connecting portion is attached to the connecting portion of one of the first and second members in a state of being sandwiched between the both sandwiching plates.

  According to this pin holder, since it is only necessary to fit the connecting portion so that the connecting portion is sandwiched between a pair of clamping plates, a known retaining means, for example, a lock pin is inserted into a small lock pin hole, and the tip thereof Compared to the case of using a structure that further inserts a split pin, etc., or a structure in which a retaining plate is bolted to the end face of the connecting pin, it can be easily mounted while exhibiting the same or better pin drop prevention effect. Can also be removed.

  In this case, the pin holder may be formed in a U-shape in which both the sandwiching plates are connected by side plates at one side of each other (Claim 6), and the both sandwiching plates are opposed to each other. Two sides may be connected by a side plate (claim 7).

  According to the structure of Claim 6, since it is easy to elastically deform in the direction which a U-shaped opening opens, it is rich in the flexibility which absorbs the dispersion | variation in the thickness dimension and surface precision of a connection part, and an assembly workability | operativity will become good.

  According to the configuration of the seventh aspect, contrary to the invention of the sixth aspect, the strength in the sense that the mouth is difficult to open increases, so there is no risk of deformation due to the weight of the connecting pin.

  Further, it is desirable that the mounting guide portion is formed by bending the tip end portion of at least one of the sandwiching plates in an outwardly inclined manner.

  According to this configuration, the pin holder can be smoothly attached to the connecting portion by the guide action of the attachment guide portion.

  According to the present invention, it is possible to obtain a high pin drop-off preventing effect in a structure in which two members are connected to each other by overlapping the pins vertically and horizontally.

It is a disassembled perspective view of the attachment part of the upper frame and swing bracket which concern on embodiment of this invention. It is a side view which shows 1 of the attachment procedure of the swing bracket with respect to an upper frame. It is a side view which shows 2 of an attachment procedure same as the above. It is a side view which shows 3 of an attachment procedure same as the above. It is a side view which shows 4 of an attachment procedure same as the above. It is the VI-VI line expanded sectional view of FIG. It is an expansion perspective view of a pin holder. FIG. 9 is a view corresponding to FIG. 8 when the pin holder is viewed from below. It is an expansion perspective view of the pin holder attachment part which shows the other example of a shape of a pin holder. FIG. 2 is a perspective view of the pin holder alone and viewed from below. It is a schematic side view of a swing type excavator as an application object of the present invention. It is an enlarged view of the swing bracket attachment part in FIG. It is a disassembled perspective view which shows the connection structure of the conventional upper frame and swing bracket. FIG. 2 is a perspective view in the middle of connection. It is a perspective view of a connection state same as the above.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiment, a pin coupling device including the pin holder of the present invention is applied to a swing bracket mounting portion of a swing excavator.

  In the embodiment, the following points regarding the basic configuration of the swing bracket and its mounting structure are the same as the known techniques shown in FIGS.

  i. As shown in FIG. 1 and the like, horizontal plate-like upper and lower side connecting portions 15 and 16 are provided in parallel with a space at the front portion of the upper frame 3, and pin holes 17 and 18 are respectively provided in the both side connecting portions 15 and 16. Are provided on the same vertical straight line.

  ii. The swing bracket 13 is formed by molding, and a boom foot mounting portion 19 is provided at the upper end portion, a boom cylinder mounting portion 20 is provided at the middle portion in the vertical direction of the front surface, and connecting portions 21 and 22 are provided on both upper and lower sides of the rear surface portion. The point that is.

  iii. The upper and lower side connecting portions 21 and 22 are formed in a U shape having a pair of upper and lower boss portions 23, 24, 25, and 26 that face each other with a space therebetween, and are identical to the boss portions 23 to 26. Pin holes 27, 28, 29, and 30 located on the vertical line are provided (see FIGS. 1 and 6).

  iv. The upper boss portion 25 of the lower connecting portion 22 is provided with a lock pin hole 32 through which the lock pin 31 shown in FIGS.

  v. When attaching the swing bracket 13 to the upper frame 3, as shown in FIGS. 2 to 6, the upper and lower side connecting portions 22 and 23 of the swing bracket 13 are connected to the upper and lower side connecting portions 15 and 16 on the upper frame side. In this state, the upper connecting pin 33 is inserted into the pin holes 17, 27, 28 of the upper connecting portions 15, 22 and the pin holes 18, 29, 30 of the lower connecting portions 16, 23 are engaged. The point which inserts the lower connection pin 34, respectively.

  vi. In this case, since the upper connecting pin 33 has a wide empty space above the connecting portion, the upper connecting pin 33 may be inserted from above using a headed pin provided with a head 33a as shown, whereas the lower connecting pin 33 Unlike the upper connection pin 33, the pin 34 cannot be inserted from above because the distance between the upper and lower side connection portions 22 and 23 is shorter than the pin length.

  vii. Therefore, as shown in FIG. 2, the lower connection pin 34 is inserted upward from below the connection portion, and the lock pin 31 is inserted in the insertion end portion (upper end portion) in the diametrical direction to prevent the connection portion 34 from coming off. The point where the configuration is taken.

  viii. For this reason, when the lock pin 31 is broken, there is a problem that the lower connection pin 34 is immediately dropped.

  In the embodiment, on the premise of the above, the pin holder 36 shown in FIGS. 4 to 8 is used as means for preventing the lower connecting pin 34 from falling off even if the lock pin 31 is broken.

  The pin holder 36 is formed in a U-shape in which a pair of upper and lower sandwiching plates 37, 38 facing each other with a gap are connected by a side plate 39 on one side of each other, and at the center of the upper sandwiching plate 37, A pin through hole 40 that allows passage of the lower connecting pin 34 is provided.

  On the other hand, the lower clamping plate 38 has a horizontal pin receiving surface (upper surface) 41 that receives and supports the lower end surface of the lower connecting pin 34 that has passed through the pin passage hole 40, and a central portion of the clamping plate 38. A pin removal operation hole 42 is provided to allow only a part (center portion) of the lower end surface of the pin received by the pin receiving surface 41 to face the lower outside.

  In addition, the distal end portion of the lower holding plate 38 is bent outwardly (downward) to form an attachment guide portion 43.

  Note that the distance between the upper and lower sandwiching plates 37 and 38 is set to be equal to or slightly smaller than the thickness dimension of the lower boss portion 26 constituting the lower connection portion 22 of the swing bracket 13.

  The swing bracket attachment procedure using the pin holder 36 will be described with reference to FIGS.

  Procedure 1: After the upper connecting pin 33 is inserted into the upper connecting portion as shown in FIG. 2, the lower connecting pin 34 is inserted into the pin holes 30, 18, 29 of the lower connecting portion (the reference numerals of these pin holes are only in FIG. 1). To insert upwards from below.

  Procedure 2: As shown in FIG. 3, the lower connecting pin 34 is lifted so that the lower end surface thereof is located above the upper surface of the lower boss portion 26.

  Procedure 3: In this state, the pin holder 36 is attached to the lower boss portion 26 of the lower connecting portion 22 as shown in FIGS.

  Specifically, the pin holder 36 is inserted and attached from the side so that the lower boss portion 26 is elastically sandwiched between the both side clamping plates 37 and 38 by the elasticity of the U-shaped plate.

  Step 4: As shown in FIGS. 5 and 6, the lower end portion of the lower connection pin 34 is passed through the pin passage hole 40 of the pin holder 36, and the lower end surface is received and supported by the pin receiving surface 41.

  Procedure 5: As shown in FIGS. 5 and 6, the lock pin 31 is inserted across the lock pin holes 32 and 35 of the upper boss portion 25 and the lower connection pin 34 to prevent the lower connection pin 34 from coming off. .

  Note that the lock pin 31 itself is prevented from coming off by a split pin (not shown).

  According to the above configuration, the following effects can be obtained.

  (1) Since the lower movement of the lower connecting pin 34 can be prevented by the pin receiving surface 41 of the pin holder 36, both the axial movements of the lower connecting pin 34 can be achieved by using the lock pin 31 that prevents the upper movement. Can be prevented and the drop-off can be prevented.

  In particular, as in the embodiment, the upper frame 3 and the swing bracket 13 are connected in the vertical direction by the vertical connection pin 34, and the connection pin 34 is inserted from below and removed by the lock pin 31 inserted in the upper end portion. Even when the lock pin 31 is broken when the structure to be stopped, that is, the structure in which the drop is most likely to occur, the connection pin 34 can be received by the pin receiving surface 41 of the pin holder 36 to prevent the fall. .

  That is, the effect of preventing the connecting pin 34 from falling off can be enhanced. For this reason, it is possible to avoid a serious accident such as damage to the swing bracket 13 or the upper frame 3 due to the falling weight of the pin at the swing bracket mounting portion.

  (2) State before insertion of the lock pin during assembly (when mounting the swing bracket), or state after removal of the lock pin when disassembled (when the bracket is removed), that is, the state where the lower connecting pin 34 is not retained. Thus, there is no possibility that the pin 34 falls by its own weight, so that the safety and efficiency of the work are improved.

  (3) Since the pin holder 36 only needs to be fitted into the boss portion 26 so as to sandwich the lower boss portion 26 of the lower connecting portion 22 between the pair of upper and lower sandwiching plates 37, 38, the known retaining means For example, it is equivalent to using a structure in which a lock pin is inserted into a small lock pin hole and a split pin or the like is inserted at the tip of the lock pin, or a structure in which a retaining plate is bolted to the tip of the connecting pin. It can be easily mounted and removed while exhibiting the above-mentioned pin drop-off preventing effect.

  (4) Since the pin holder 36 is formed in a U-shaped plate in which both the holding plates 37 and 38 are connected to each other by the side plate 39 at one side, it is elastically deformed in the direction in which the U-shaped mouth opens. It is easy, has a great flexibility to absorb variations in the thickness dimension and surface accuracy of the boss portion 26, and has good assembly workability.

  (5) Since the lower clamping plate 38 is provided with a pinning operation hole 42 that allows only the center portion of the lower end surface of the pin received by the pin receiving surface 41 to face downward, the pin is removed when the connecting pin 34 is removed. The connecting pin 34 can be easily pulled out by hitting the central portion of the pin end face viewed through the punching operation hole 42 with a hammer or the like.

  (6) Since the mounting guide portion 43 is formed by bending the tip portion of the lower clamping plate 38 outwardly, the pin holder 36 is smoothly moved by the lower boss portion 26 by the guide action of the mounting guide portion 43. Can be installed on.

Other Embodiments As another example of the shape of the pin holder 36, as shown in FIGS. 9 and 10, both sandwiching plates 37 and 38 are connected by side plates 39 a and 39 a at two opposite sides to each other. The holder 36 may be configured.

  In this case, since a processing method of forming a pin through hole 40 by combining a pair of semicircular notches by cutting and bending a single plate, the pin through hole 40 is partially cut away as shown in the figure. It becomes the shape with.

  According to this configuration, contrary to the above-described embodiment, the strength that means that the U-shaped mouth is difficult to open increases, so there is no risk of deformation due to the weight of the pin, particularly when two members are connected with a vertical pin. .

  In addition, also about this pin holder 36, you may bend the front-end | tip part of one clamping plate 37,38 in outward inclined shape, and may form an attachment guide part.

  Moreover, you may form an attachment guide part in the front-end | tip part of both the clamping plates 37 and 38 including embodiment shown in FIGS.

  On the other hand, the present invention can be widely applied not only to the mounting part of the swing bracket in the swing type excavator mentioned in the above embodiment but also to the part where the two members are pin-connected.

  Here, the present invention is particularly effective in the case where the two members are connected in the vertical direction as described above (when the pin falls by its own weight), but the connection pin is also used in the case where the two members are connected in the horizontal direction. This can also be applied to this case.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Upper frame which comprises an upper revolving body (1st member connected)
4 Boom constituting work attachment 5 Same arm 6 Same bucket 10 Work attachment 13 Swing bracket (second member to be connected)
15 Upper frame upper connection part 16 Same as lower connection part 17, 18 Pin hole 21 Upper connection part of swing bracket 22 Same as lower connection part 23, 24 Both upper and lower boss parts 25, 25 constituting the upper connection part 26 Both upper and lower boss portions constituting the lower connection portion 27, 28, 29, 30 Pin hole of each boss portion 31 Lock pin 32 Lock pin hole 33 Upper connection pin 34 Lower connection pin 36 Pin holder 37 Pin holding Upper clamping plate constituting the tool 38 Same as the lower clamping plate 39 Side plate 39a, 39a Side plate 40 Pin passage hole 41 Pin receiving surface 42 Pin removal operation hole 43 Mounting guide portion

Claims (8)

A pin coupling device comprising all of the following requirements (i) to (vi):
(i) A connecting portion having a pin hole is provided in both the first and second members to be phase-connected.
(ii) The connecting portions are connected to each other by a connecting pin in a state where the connecting portions are overlapped in the vertical direction or the horizontal direction so that the pin holes are coincident with each other.
(iii) It has a pin holder which prevents one axial movement of the connecting pin.
(iv) The pin holder includes a pair of sandwiching plates facing each other at an interval, and a pin through hole is provided in one sandwiching plate, and a pin receiving surface is provided in the other sandwiching plate.
(v) The pin holder is attached to one of the connecting portions in a state where the connecting portion is sandwiched between the holding plates.
(vi) The connecting pin is inserted into the pin holes of both connecting portions in a state where one end face is received by the pin receiving surface through the pin through hole. (A) A state in which the first and second members are each provided with a connecting portion having a pin hole penetrating in the vertical direction, and the connecting portions are overlapped in the vertical direction so that the pin holes coincide with each other. Configured to be connected by a connecting pin,
(B) The pin holder is attached to the lower connecting portion in the superimposed state,
(C) Of the two holding plates of the pin holder, the pin through hole is provided in the upper holding plate in the mounted state, and the pin receiving surface is provided in the lower holding plate. Item 2. The pin coupling device according to Item 1.   In the pin holder provided with the pin receiving surface in the pin holder, only a part of one end surface of the connecting pin received by the pin receiving surface is exposed to the outside opposite to the pin receiving surface. The pin coupling device according to claim 1, wherein the pin coupling device is provided.   A lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body, a swing bracket that is swingably mounted to the left and right by a pin coupling device on an upper frame that constitutes the upper revolving body, and the swing bracket The upper frame is provided with upper and lower connecting portions with pin holes facing each other in the vertical direction, while the upper and lower bosses with pin holes are provided on the swing bracket. The upper connecting portion of the upper frame is sandwiched between both boss portions of the upper connecting portion of the swing bracket, and the upper connecting portion of the upper frame is sandwiched between the boss portions of the lower connecting portion of the swing bracket. In a state where the lower connecting portion of the upper frame is sandwiched, the upper connecting portions and the lower connecting portions are connected to each other. In a construction machine with a pin coupling device that couples the parts with both upper and lower coupling pins, the upper frame is the first member in the pin coupling device according to claim 2, and the swing bracket is the second member. The pin holder is configured to be attached to at least the lower boss portion of the lower connecting portion of the upper and lower side connecting portions of the swing bracket in a state where the lower end surface of the swing pin is received by the pin receiving surface. Construction machine with a pin coupling device characterized by In the state where the connecting portions with pin holes provided in the first and second members to be phase-coupled are overlapped in the vertical direction or the horizontal direction so that the pin holes of each other coincide, A pin holder used in a pin coupling device for coupling the first and second members by inserting a coupling pin to prevent one axial movement of the coupling pin,
(I) provided with a pair of clamping plates facing each other at an interval,
(II) A pin through hole allowing passage of the connecting pin is provided in one of the holding plates, and one end surface of the connecting pin passing through the pin through hole is received in the other holding plate. Each pin receiving surface is provided,
(III) A pin for a pin coupling device, wherein the coupling portion is attached to a coupling portion of one of the first and second members in a state of being sandwiched between the both clamping plates. Retaining tool. 6. The pin holder for a pin connecting device according to claim 5, wherein the both sandwiching plates are formed in a U-shaped plate connected by side plates at one side of each other.
  6. The pin holder for a pin coupling device according to claim 5, wherein the both clamping plates are connected by side plates at two opposite sides.   8. The pin connecting device according to claim 5, wherein an attachment guide portion is formed by bending an end portion of at least one of the sandwiching plates outwardly in an inclined manner. 9. Pin holder.