JP7483314B2 - Sprocket tooth replacement device - Google Patents

Description

The present invention relates to a sprocket tooth replacement device.

Continuous unloaders are used as equipment to unload bulk cargo such as coal and iron ore from the holds of ships anchored on the water in a harbor. Continuous unloaders have a bucket elevator supported by a boom that extends toward the ship.

A bucket elevator uses buckets to scrape loose material from inside the hold, lift the material, and transport it outside the hold. A bucket elevator is equipped with sprockets located at the top and bottom, and an endless chain with multiple buckets attached that is looped around the sprockets.

The sprocket has a main body portion and a number of teeth arranged in the circumferential direction of the main body portion. Of the sprockets, the upper sprocket is disposed inside the casing. The chain is looped around the teeth of the sprocket. The chain circulates as the upper sprocket rotates. In other words, the upper sprocket functions as a drive sprocket.

The bucket elevator pulls the bucket by circulating a chain, lifts the bulk material picked up by the bucket, and carries it out of the hold.

When the bucket scrapes out loose cargo from the hold, it experiences digging resistance. When the bucket experiences digging resistance, the chain also experiences resistance. When the chain experiences resistance, a load is placed on the sprocket that circulates the chain. When the sprocket is subjected to a load from the chain, the sprocket teeth wear down.

Sprockets are necessary to allow the chain to circulate safely. Therefore, when the teeth of a sprocket wear out, the sprocket must be replaced. As a result, even if only a few of the teeth are worn out, the entire sprocket, including the main body, must be replaced, which is one of the reasons for increased costs.

To solve this problem, a sprocket has been proposed that allows only the teeth of the sprocket to be replaced (see, for example, Patent Document 1).

Japanese Utility Model Application Publication No. 7-25359

In the technology disclosed in Patent Document 1, the sprocket has a sprocket body and teeth (replacement teeth) that are detachably attached to the outer periphery of the sprocket body. In the sprocket disclosed in Patent Document 1, the replacement teeth are fixed to the sprocket body by inserting and tightening bolts through bolt holes located on the outer periphery of the sprocket body and bolt holes located in the replacement teeth. With the sprocket disclosed in Patent Document 1, even if the replacement teeth wear out, only the worn replacement teeth need to be replaced with new replacement teeth, which helps keep costs down.

Here, conventionally, replacement of the upper sprocket teeth was done manually by two workers on the temporary scaffolding, with one worker holding the replacement teeth and another worker removing and installing the replacement teeth entering the inside of the casing on a temporary scaffolding. However, the replacement teeth of the sprockets used in continuous unloaders are heavy, and the inside of the casing is narrow. Furthermore, the casing on which the upper sprocket is installed is located at a high position. Moreover, the worker holding the replacement teeth must hold the replacement teeth in accordance with the position and angle of the replacement teeth for replacement. Therefore, working on the temporary scaffolding is a burden for the workers.

The purpose of this invention is to make it possible to easily replace replacement teeth on sprockets used in large machinery such as continuous unloaders.

The sprocket tooth replacement device according to the present invention is a replacement device for replacing replacement teeth of a sprocket, and is characterized in that it has a replacement tooth receiving part that supports the replacement teeth and a lifting part that raises and lowers the replacement tooth receiving part, and the replacement tooth receiving part has an insertion hole through which a fastening member that fastens the replacement tooth receiving part and the replacement tooth is inserted.

The present invention allows for easy replacement of sprocket teeth.

1 is a schematic diagram of a continuous unloader in which a sprocket tooth changing device according to the present invention is used. 2 is a schematic diagram showing an embodiment of the sprocket tooth changing device according to the present invention used inside a casing of a bucket elevator of a continuous unloader in the area surrounded by A in FIG. 1 . FIG. FIG. 3 is a plan view of a sprocket used in the bucket elevator of FIG. FIG. 4 is a perspective view of a replacement tooth provided on the sprocket of FIG. 3 . 1 is a front view showing an embodiment of a sprocket tooth changing device according to the present invention. FIG. 6 is a front view showing a state in which a lifting unit provided in the sprocket tooth replacing device of FIG. 5 is lifted. FIG. 7 is a front view showing a state in which a replacement tooth receiving portion of the sprocket tooth replacing device is rotated by a rotating portion of the sprocket tooth replacing device shown in FIG. 6. FIG. 7 is a side view of the sprocket tooth changing device shown in FIG. 6 . FIG. 7 is a rear view of the sprocket tooth changing device shown in FIG. 6 . 6 is a schematic diagram showing a replacement tooth receiving portion of the sprocket tooth changing device of FIG. 5 in a state in which the replacement tooth of the sprocket is supported. FIG. 11 is a cross-sectional view taken along line BB in FIG. 10 . FIG. 12 is a perspective view of FIG. FIG. 6 is a perspective view of a temporary device for moving the sprocket tooth changing device of FIG. 5 . FIG. 14 is an exploded perspective view of the temporary device of FIG. 13 . 13 is an explanatory diagram showing a state in which the temporary fixture of FIG. 12 is temporarily installed on a casing of a bucket elevator, and the sprocket tooth changing device of FIG. 5 is disposed on the temporary fixture outside the casing. FIG. FIG. 16 is an explanatory diagram showing a state in which the sprocket tooth changing device shown in FIG. 15 has been moved from the outside to the inside of the casing of the bucket elevator. 17 is an explanatory diagram showing the sprocket tooth changing device shown in FIG. 16 rotated 90 degrees horizontally. FIG. FIG. 18 is a view taken along the arrow C in FIG. 17 . 18 is an explanatory diagram showing a state in which the sprocket tooth changing device shown in FIG. 17 is raised and supports replacement teeth of a sprocket. FIG. 20 is an explanatory diagram showing a state in which the sprocket tooth replacing device shown in FIG. 19 is lowered and supports a detached replacement tooth. FIG. 21 is an explanatory diagram showing a state in which the sprocket tooth changing device shown in FIG. 20 is rotated 90 degrees in the horizontal direction and moved from the inside to the outside of the casing. FIG. 22 is an explanatory diagram showing a state in which the sprocket tooth changing device shown in FIG. 21 has been moved to the outside of the casing. FIG.

The sprocket tooth replacement device according to the present invention is described with reference to the following embodiment and drawings. The sprocket tooth replacement device according to the present invention (hereinafter referred to as "the device") is used to replace the replacement teeth of a sprocket of a large machine.

●Continuous unloader●
First, a continuous unloader will be described as an example of a large-scale mechanical device in which the present device can be used.

Configuration of the continuous unloader FIG. 1 is a schematic diagram of a continuous unloader.
The continuous unloader UL unloads bulk cargo such as coal and iron ore from the holds of ships anchored on the water in a harbor. The continuous unloader UL has a boom BM that extends toward the ship and a bucket elevator BE that is supported by the boom BM. The bucket elevator BE is long in the vertical direction (the vertical direction of the paper in FIG. 1 ).

●Bucket elevator configuration

In the following description, unless otherwise specified, when the three mutually orthogonal axes shown in each figure are the X-axis, Y-axis, and Z-axis, respectively, the "X-axis direction" is the left-right direction in this embodiment. The "Y-axis direction" is the front-rear direction in this embodiment. The "Z-axis direction" is the up-down direction in this embodiment. The "+X-axis direction" (towards the back of the paper in FIG. 1) is the left in this embodiment. The "-X-axis direction" is the right in this embodiment. The "+Y-axis direction" (towards the left of the paper in FIG. 1) is the front in this embodiment. The "-Y-axis direction" is the rear in this embodiment. The "+Z-axis direction" (upward on the paper in FIG. 1) is the upward direction in this embodiment. The "-Z-axis direction" is the downward direction in this embodiment.

FIG. 2 is a schematic diagram of the area surrounded by A in FIG. 1, and is a schematic diagram showing a mode of use of the present device 1 inside a casing CS provided in a bucket elevator BE.
The figure shows a state in which the temporary fixture TA and the device 1 are installed inside a casing CS of a bucket elevator BE. For convenience of explanation, a chain CH and a bucket BC, which will be described later, are omitted from the figure.

The bucket elevator BE lifts the bulk cargo scraped by the buckets BC from the hold and transports it outside the hold. The bucket elevator BE is equipped with a sprocket S, a casing CS, an endless chain CH (see Figure 1) that is looped around the sprocket S, a number of buckets BC (see Figure 1) attached to the chain CH, and a holding member HM.

The bucket elevator BE is equipped with sprockets S, an upper sprocket SU arranged on the upper side of the bucket elevator BE, and a lower sprocket SL arranged on the lower side of the bucket elevator BE.

The casing CS is the outer wall that constitutes the bucket elevator BE, and covers the sprocket S (upper sprocket SU, described below), buckets BC, and chain CH. The casing CS has an opening OP.

The openings OP are rectangular service openings that connect the inside and outside of the casing CS. The openings OP are positioned to correspond to the upper sprocket SU, which will be described later. Therefore, two openings OP are positioned on the side wall SW of the casing CS. Temporary equipment TA, which will be described later, is placed in the openings OP. The device 1 and a worker (not shown) use the temporary equipment TA to move between the inside and outside of the casing CS. The openings OP are an example of a work service opening in the present invention. The device 1 and a worker can move between the inside and outside of the casing CS from any of the openings OP.

The bucket BC scrapes off loose objects from inside the cargo hold. Multiple buckets BC are attached at equal intervals along the entire length of the chain CH.

The chain CH is looped around the upper sprocket SU and the lower sprocket SL (see Figure 1) and circulates up and down inside the bucket elevator BE while pulling the bucket BC.

In this way, the bucket elevator BE pulls the bucket BC by circulating the chain CH, lifts the bulk material scraped up by the bucket BC, and carries it out of the hold.

The holding member HM holds the upper sprocket SU.

The upper sprocket SU rotates around a rotation axis (not shown) to circulate the chain CH. In other words, the upper sprocket SU functions as a drive sprocket. The upper sprocket SU is disposed along the left and right side walls SW of the casing CS.

The lower sprocket SL rotates in response to the drive of the upper sprocket SU. In other words, the lower sprocket SL functions as a driven sprocket.

The upper sprocket SU and the lower sprocket SL each consist of a pair of sprockets. That is, for example, the upper sprocket SU consists of a first upper sprocket SU1 and a second upper sprocket SU2. The lower sprocket SL consists of a first lower sprocket (not shown) and a second lower sprocket (not shown).

The first upper sprocket SU1 is positioned along the right sidewall SW, and the second upper sprocket SU2 is positioned along the left sidewall SW.

In the following description, when there is no need to distinguish between the first upper sprocket SU1 and the second upper sprocket SU2, they will be referred to as the "upper sprocket SU." When there is no need to distinguish between the first lower sprocket and the second lower sprocket, they will be referred to as the "lower sprocket SL."

Sprocket Configuration FIG. 3 is a plan view of the sprocket S.

The upper sprocket SU and the lower sprocket SL have the same structure. In addition, the sprocket whose replacement teeth are replaced by the device 1 is the upper sprocket SU. Therefore, the following explanation will be given using the upper sprocket SU as an example. That is, FIG. 3 is a plan view of the upper sprocket SU.

The upper sprocket SU comprises a sprocket body SB, a number of replacement teeth ST, and a connecting member (not shown) that connects the sprocket body SB and the replacement teeth ST.

The connecting member connects the sprocket body SB and the replacement teeth ST. The connecting member is, for example, a high tension bolt that includes a bolt and a nut.

The sprocket body SB is held by the holding member HM (see Figure 2). The sprocket body SB is circular. The sprocket body SB has a replacement tooth holding portion SB1 and a body side connection hole SB1h.

The replacement tooth holding portion SB1 holds the replacement tooth ST. The replacement tooth holding portions SB1 are arranged continuously along the circumferential direction of the sprocket body SB. The replacement tooth holding portion SB1 has a groove (not shown) with a rectangular cross section and a predetermined depth.

The body-side connecting hole SB1h is a through hole through which a connecting member is inserted. Multiple body-side connecting holes SB1h are arranged along the circumferential direction of the replacement tooth holding part SB1. Each of the body-side connecting holes SB1h is arranged at a predetermined interval.

A chain CH (see FIG. 1) is looped around each replacement tooth ST, causing the chain CH to circulate. Each replacement tooth ST is arranged in the groove of the replacement tooth holder SB1 in the circumferential direction and is clamped by the replacement tooth holder SB1. The number of replacement teeth ST is, for example, "12." That is, for example, the upper sprocket SU has 12 teeth (replacement teeth ST) in the circumferential direction.

The number of replacement teeth is not limited to 12.

FIG. 4 is a perspective view of a replacement tooth ST.
The replacement teeth ST each have a common configuration.

The replacement tooth ST has a base portion ST1, a replacement tooth side connecting hole ST1h, a tooth portion ST2, a fastening hole ST2h, and a step portion ST3.

The base portion ST1 is the portion that is clamped to the sprocket body SB and is placed in the groove of the replacement tooth holding portion SB1.

The replacement tooth side connecting hole ST1h is a through hole through which a connecting member is inserted. Multiple replacement tooth side connecting holes ST1h are arranged around the circumferential direction of the base ST1. Each replacement tooth side connecting hole ST1h is arranged at a predetermined interval. The number of replacement tooth side connecting holes ST1h arranged on one replacement tooth ST is, for example, "4". A connecting member is inserted into each replacement tooth side connecting hole ST1h while communicating with the main body side connecting hole SB1h. This fixes the replacement tooth ST to the sprocket main body SB.

The tooth portion ST2 engages with the chain CH. The thickness of the tooth portion ST2 (in the direction from the front to the back of the paper in FIG. 4) is greater than the thickness of the base portion ST1.

The fastening hole ST2h is a through hole through which the fastening member 70 (see FIG. 12) described later is inserted. The fastening hole ST2h is arranged in the tooth portion ST2. The number of fastening holes ST2h is "1". The fastening member 70 is inserted through the fastening hole ST2h in a state in which the fastening hole ST2h is in communication with the insertion hole 53h (see FIG. 5) described later.

The step ST3 is a step between the base ST1 and the tooth portion ST2, and is formed by the difference in thickness between the base ST1 and the tooth portion ST2. The step ST3 abuts against the rotation restriction member 80 (see FIG. 12) inserted into the rotation restriction hole 54h (see FIG. 5), which will be described later.

●Sprocket tooth replacement device●
Next, the present device will be described.

Configuration of the Sprocket Tooth Changing Device FIG. 5 is a front view showing an embodiment of the device 1. As shown in FIG.
FIG. 6 is a front view showing the state in which the lifting section of the device 1 is raised.

As shown in Figure 2, the device 1 moves left and right over the temporary fixture TA inside the casing CS.

This device 1 is used to replace the replacement teeth ST of the sprocket S (upper sprocket SU). This device 1 has a lifting unit 10, a main body unit 20, a rotating unit 30, a pivoting unit 40, a replacement tooth receiving unit 50, a transport unit 60, a fastening member 70 (see FIG. 12), and a rotation restricting member 80 (see FIG. 12).

The lifting unit 10 moves the replacement tooth receiving part 50 in the up and down direction. The lifting unit 10 is, for example, a hydraulic lifter that raises or lowers the replacement tooth receiving part 50 by hydraulic pressure. The up and down movement of the replacement tooth receiving part 50 by the lifting unit 10 is, for example, by an operator operating an operating lever (not shown) provided on the device 1. The lifting unit 10 is placed on the transport unit 60. The lifting unit 10 has a top plate 11.

The top plate 11 supports the main body unit 20 and the rotating unit 30. The top plate 11 is disposed on the upper part of the lifting unit 10.

The main body 20 rotates horizontally (rotates along the XY plane) by the rotating part 30, and slides the replacement tooth receiving part 50. The main body 20 has a slide shaft (not shown) that extends in the front-rear direction, and a support part 21 that supports the replacement tooth receiving part 50. The main body 20 slides the replacement tooth receiving part 50 with the extension direction of the slide shaft as the axial direction. When the device 1 is oriented as shown in FIG. 5, the main body 20 slides the replacement tooth receiving part 50 in the left-right direction.

The rotating unit 30 rotates the main body 20, thereby rotating the replacement tooth receiving part 50 in a horizontal direction. The axial direction (rotation axis direction) of the rotation axis of the rotating unit 30 is the same as the direction in which the replacement tooth receiving part 50 is raised and lowered by the lifting unit 10. In other words, the rotating unit 30 rotates the main body 20 and the replacement tooth receiving part 50 in a horizontal direction around the rotation axis. The rotation by the rotating unit 30 is, for example, 90 degrees in the "+X axis" - "-Y axis" direction.

FIG. 7 is a front view showing a state in which the replacement tooth receiving part 50 has been rotated by the rotating part 40. As shown in FIG.
In the figure, the rotated state of the replacement tooth receiving part 50 is shown by a solid line, and the state of the replacement tooth receiving part 50 before rotation is shown by a two-dot chain line.

The rotating part 40 rotates (swings) the replacement tooth receiving part 50 in the circumferential direction of the sprocket S (upper sprocket SU). The rotating part 40 is attached to the replacement tooth receiving part 50 and supported by the support part 21. The rotating part 40 includes a rotating shaft 41 (see FIG. 8) and a handle 42. The rotating shaft 41 is an axis of rotation of the replacement tooth receiving part 50. The axial direction of the rotating shaft 41 is parallel to the axial direction of the rotation shaft (not shown) of the sprocket S. The handle 42 is attached to the replacement tooth receiving part 50 via the rotating shaft 41. When the operator rotates the handle 42, the replacement tooth receiving part 50 rotates (swings) around the rotating shaft 41 along the outer periphery of the replacement tooth ST (see FIG. 3). In other words, the replacement tooth receiving part 50 rotates (swings) around the rotating shaft 41 in the same direction as the rotation direction of the sprocket S or in the opposite direction to the rotation direction of the sprocket S.
The range in which the replacement tooth receiving part 50 rotates is a predetermined range centered on the lower end of the sprocket body SB of the sprocket S (the end on the lower side of the paper in FIG. 18 described later). The predetermined range is determined, for example, by the length of the replacement tooth receiving part 50 in the longitudinal direction (the left-right direction of the paper in FIG. 7).

Returning to FIG. 5 and FIG.
The replacement tooth receiving part 50 supports the replacement tooth ST (see FIG. 3). The replacement tooth receiving part 50 includes a side plate 51, a side plate connecting hole 52h, an insertion hole 53h, a rotation restriction hole 54h, and a side plate connecting member 55 (see FIG. 8). The specific configuration of the replacement tooth receiving part 50 will be described later.

The transport unit 60 supports the lifting unit 10 and moves the replacement tooth receiving unit 50 relative to the upper sprocket SU. In other words, the transport unit 60 is a moving means for moving the device 1 forward and backward relative to the upper sprocket SU between the outside and inside of the casing CS. In other words, the replacement tooth receiving unit 50 can move forward and backward relative to the upper sprocket SU. The transport unit 60 is equipped with wheels 61.

The wheels 61 move on two rails RA (described later) of the temporary fixture TA, enabling the device 1 to move forward and backward. Two wheels 61 are attached to the transport unit 60 for each rail RA. In other words, the number of wheels 61 provided on the transport unit 60 is four.

Configuration of Replacement Tooth Receiving Part FIG. 8 is a side view of the device 1 shown in FIG.
FIG. 9 is a rear view of the device 1 shown in FIG.

The specific configuration of the replacement tooth receiving part 50 will be described below with reference to Figures 6, 8, and 9.

The side plates 51 include a front plate 51a and a rear plate 51b. The front plate 51a, together with the rear plate 51b, sandwiches the replacement tooth ST. The front plate 51a and the rear plate 51b are roughly crescent-shaped plates that are curved concentrically with the upper sprocket SU.

The front side plate 51a is supported by the support part 21 and is attached to the rotating part 40 (rotating shaft 41).

The rear side plate 51b is supported by the support portion 21 and is connected to the front side plate 51a via the side plate connecting member 55.

The side plate connecting hole 52h is a through hole through which the side plate connecting member 55 is inserted. A plurality of side plate connecting holes 52h are arranged along the circumferential direction of the lower part of each of the front side plate 51a and the rear side plate 51b. Each of the side plate connecting holes 52h is arranged at a predetermined interval. The number of side plate connecting holes 52h arranged on each of the front side plate 51a and the rear side plate 51b is, for example, "5". The position of each side plate connecting hole 52h arranged on the front side plate 51a corresponds to the position of each side plate connecting hole 52h arranged on the rear side plate 51b. Here, for convenience of explanation, the side plate communication holes of each of the front side plate 51a and the rear side plate 51b are given the same reference numerals.

In this way, the side plate connecting member 55 is inserted into the side plate connecting hole 52h of each of the front side plate 51a and the rear side plate 51b, thereby connecting the front side plate 51a and the rear side plate 51b. In other words, the replacement tooth receiving part 50 is generally crescent-shaped without a bottom.

The number of side panel connection holes is not limited to "5".

The through holes 53h are through holes through which the fastening members 70 (see FIG. 12) are inserted. The through holes 53h are arranged in a number along the circumferential direction of the upper part of each of the front plate 51a and the rear plate 51b. The through holes 53h are arranged at a predetermined interval. The number of through holes 53h arranged in each of the front plate 51a and the rear plate 51b is, for example, "10". That is, the front plate 51a and the rear plate 51b each have through holes 53h0, 53h1, 53h2, 53h3, 53h4, 53h5, 53h6, 53h7, 53h8, and 53h9. The imaginary lines (not shown) connecting the through holes 53h0-53h9 of each of the front plate 51a and the rear plate 51b are arranged concentrically with the upper sprocket SU. The positions of the through holes 53h0-53h9 arranged in the front plate 51a correspond to the positions of the through holes 53h0-53h9 arranged in the rear plate 51b. Here, for ease of explanation, the corresponding through holes in the front plate 51a and the rear plate 51b are given the same reference numerals.

The rotation restriction hole 54h is a through hole through which the rotation restriction member 80 (see FIG. 12) is inserted. The rotation restriction holes 54h are arranged in a plurality of positions along the circumferential direction at the top of the front plate 51a between the top end and the insertion holes 53h0-53h9. The rotation restriction holes 54h are arranged at a predetermined interval. The number of rotation restriction holes 54h is, for example, "10". That is, the front plate 51a is provided with the rotation restriction holes 54h0, 54h1, 54h2, 54h3, 54h4, 54h5, 54h6, 54h7, 54h8, and 54h9. The imaginary lines (not shown) connecting the rotation restriction holes 54h0-54h9 are arranged concentrically with the upper sprocket SU and the insertion holes 53h0-53h9. No rotation restriction holes are arranged in the rear plate 51b.

The number of insertion holes and the number of rotation restriction holes are not limited to 10. The number of rotation restriction holes may be different from the number of insertion holes.

The side plate connecting members 55 are inserted into each side plate connecting hole 52h to connect the front side plate 51a and the rear side plate 51b. The dimension between the front side plate 51a and the rear side plate 51b is slightly larger than the thickness of the tooth portion ST2 of the replacement tooth ST.

FIG. 10 is a schematic diagram showing the replacement tooth receiving part 50 in a state in which the replacement tooth ST is supported.
FIG. 11 is a cross-sectional view taken along line BB in FIG.
FIG. 12 is a perspective view of FIG.

Figure 10 shows a state in which two of the multiple replacement teeth ST (first replacement tooth ST-1 and second replacement tooth ST-2) are supported by the replacement tooth receiving portion 50.

The following explanation also refers to Figure 6.

The fastening member 70 is inserted through one of the insertion holes 53h0-53h9 53h and through the fastening hole ST2h. FIG. 10 shows the fastening member 70 being inserted through the insertion hole 53h6 and the fastening hole ST2h to fasten the first replacement tooth ST-1 and the side plate 51. The same figure also shows the fastening member 70 being inserted through the insertion hole 53h1 and the fastening hole ST2h to fasten the second replacement tooth ST-2 and the side plate 51. The fastening member 70 is, for example, a high tension bolt equipped with a bolt and a nut.

As shown in FIG. 11, the fastening member 70 is inserted through the insertion hole 53h (53h6) of the front plate 51a, the fastening hole ST2h, and the insertion hole 53h (53h6) of the rear plate 51b, and the fastening member 70 is tightened by the nut of the fastening member 70, thereby fastening the replacement tooth ST (first replacement tooth ST-1) to the front plate 51a and the rear plate 51b. As a result, the replacement tooth ST is supported by the replacement tooth receiving part 50. At this time, the replacement tooth ST is held by the inner surface of the front plate 51a and the inner surface of the rear plate 51b. In other words, the replacement tooth ST is sandwiched between the front plate 51a and the rear plate 51b, and is fixed (held) to the replacement tooth receiving part 50 by receiving the surface pressure from the front plate 51a and the rear plate 51b.

The rotation restriction member 80 is inserted into the rotation restriction hole 54h. The rotation restriction member 80 abuts against the step portion ST3. The rotation restriction member 80 is, for example, a bolt and a nut.

When the replacement tooth receiving part 50 supports the replacement tooth ST, the replacement tooth ST is simply supported by the replacement tooth receiving part 50 by being fastened to the side plate 51 by the fastening member 70 inserted through the fastening hole ST2h. Therefore, depending on the position in which the replacement tooth ST is supported by the replacement tooth receiving part 50, the replacement tooth ST is likely to rotate (tend to tilt) due to its own weight. That is, for example, in the example shown in FIG. 10, the first replacement tooth ST-1 is likely to rotate counterclockwise, and the second replacement tooth ST-2 is likely to rotate clockwise.

For the first replacement tooth ST-1, the rotation restriction member 80 is inserted, for example, into rotation restriction hole 54h8 of rotation restriction holes 54h0-54h9, and the tip side of the rotation restriction member 80 is tightened with a nut. The rotation restriction hole 54h through which the rotation restriction member 80 is inserted is, for example, the rotation restriction hole 54h located on the end side of the replacement tooth ST supported by the replacement tooth receiving part 50, among the rotation restriction holes 54h0-54h9. As a result, even if the first replacement tooth ST-1 tries to rotate counterclockwise due to its own weight, the step ST3 abuts against the rotation restriction member 80. As a result, the rotation of the first replacement tooth ST-1 is restricted by the rotation restriction member 80.

For the second replacement tooth ST-2, the rotation restriction member 80 is inserted, for example, through the rotation restriction hole 54h0 of the rotation restriction holes 54h0-54h9, and the tip side of the rotation restriction member 80 is tightened with a nut. When a part of the replacement tooth ST protrudes from the end of the replacement tooth receiving part 50, as in the case of the second replacement tooth ST-2, the rotation restriction hole 54h through which the rotation restriction member 80 is inserted is, for example, the rotation restriction hole 54h0 of the rotation restriction holes 54h0-54h9 that is located as far away as possible from the insertion hole 53h1. As a result, even if the second replacement tooth ST-2 tries to rotate clockwise due to its own weight, the step ST3 abuts against the rotation restriction member 80. As a result, the rotation of the second replacement tooth ST-2 is restricted by the rotation restriction member 80.

●Temporary equipment●
Configuration of the Temporary Equipment FIG. 13 is a perspective view of the temporary equipment TA for moving the present device 1. As shown in FIG.
FIG. 14 is an exploded perspective view of FIG.

The temporary tool TA is temporarily installed on the casing CS (see Figure 2) when replacing the replacement teeth ST of the upper sprocket SU. The device 1 and the worker move on the temporary tool TA. In other words, the temporary tool TA functions as a temporary scaffold. The temporary tool TA includes a scaffolding fixing base FB, rails RA, a scaffolding board SP, and a protective board CP.

The scaffolding fixing base FB is fitted with a rail RA and a scaffolding board SP. The scaffolding fixing base FB is placed on the inner frame of the opening OP of the casing CS.

The wheels 61 (see Figure 5) of the device 1 move on rails RA. The rails RA are attached to the sides (front and back) of the scaffolding fixing base FB. In other words, there are two rails RA. The length of the rails RA is longer than the dimension between the left and right side walls SW of the casing CS. In other words, when the temporary equipment TA is erected on the casing CS, the rails RA protrude from the side wall SW (opening OP) of the casing CS.

The scaffolding board SP is a scaffold for workers to move around on. The scaffolding board SP is divided into several pieces and attached to the top of the scaffolding fixed base FB. The scaffolding board SP is placed between two rails RA. The divided scaffolding boards SP are placed on the scaffolding fixed base FB with a specified distance between them.

The protective boards CP protect the scaffolding. The protective boards CP are placed across the divided scaffolding boards SP to fill in the gaps between the scaffolding boards SP.

As described above, the device 1 and the temporary tool TA are used when replacing the replacement teeth ST of the upper sprocket SU. The device 1 is placed on the temporary tool TA (rail RA), and the wheels 61 of the device 1 move on the rail RA. In other words, the device 1 and the temporary tool TA constitute a replacement tooth replacement unit.

● Operation of the sprocket tooth replacement device ●
Next, the operation of the present device 1 will be described.

FIG. 15 is an explanatory diagram showing a state in which a temporary tool TA is temporarily installed in a casing CS, and the device 1 is disposed on the temporary tool TA outside the casing CS.
FIG. 16 is an explanatory diagram showing a state in which the device 1 has been moved from the outside to the inside of the casing CS.
FIG. 17 is an explanatory diagram showing the state in which the device 1 is rotated 90 degrees in the horizontal direction.
FIG. 18 is a view taken along the arrow C in FIG.
FIG. 19 is an explanatory diagram showing a state in which the device 1 is raised and supports the replacement teeth ST of the upper sprocket SU.
FIG. 20 is an explanatory diagram showing a state in which the device 1 has been lowered to support a detached replacement tooth ST.

The following explanation is an example of replacing the replacement teeth ST of the first upper sprocket SU1 using the device 1 through the right opening OP. In the following explanation, reference is made to Figures 6, 12, and 13.

For ease of explanation, the chain CH and bucket BC are omitted from each figure (the same applies to Figures 21 and 22).

First, the temporary equipment TA is temporarily installed in the casing CS by a worker. At this time, the scaffolding fixing base FB is placed in the inner frame of the opening OP. Next, the rails RA, scaffolding boards SP, and protective boards CP are attached to the scaffolding fixing base FB. This completes the installation of temporary scaffolding inside the casing CS.

Next, outside the casing CS, the device 1 is installed on the temporary fixture TA. At this time, the lifting unit 10 is not raised.

Then, the device 1 moves from the outside of the casing CS through the opening OP to the inside of the casing CS. The device 1 moves (moves forward) by the wheels 61 rotating on the temporary equipment TA (rails RA). At this time, the device 1 is pushed (or pulled) by the worker to move from the outside to the inside of the casing CS. The device 1 moves to the vicinity below the upper sprocket SU (first upper sprocket SU1).

Next, the rotating unit 30 of the device 1 rotates the main body 20 and the replacement tooth receiving unit 50 horizontally by 90 degrees. At this time, the rotation of the main body 20 is performed by the operator. The operator also adjusts the left-right position of the device 1 so that the replacement tooth receiving unit 50 is positioned directly below the replacement tooth ST of the upper sprocket SU.

Next, the device 1 raises the replacement tooth receiving part 50 by the lifting part 10. At this time, the replacement tooth receiving part 50 is raised by the operator operating an operating lever (not shown), etc.

Then, the device 1 supports the replacement tooth ST with the raised replacement tooth receiving part 50. At this time, the replacement tooth receiving part 50 is slid in the front-rear direction along the slide axis of the main body part 20 by the operator. The replacement tooth receiving part 50 is also rotated by the rotation of the rotating part 40 so that the position of the fastening hole ST2h coincides with the position of any one of the insertion holes 53h (insertion holes 53h0-53h9). In other words, the rotating part 40 positions the insertion hole 53h relative to the fastening hole ST2h by rotating the replacement tooth receiving part 50. In other words, the rotating part 40 rotates the replacement tooth receiving part 50 to a position where one of the insertion holes 53h (insertion holes 53h0-53h9) is connected to the fastening hole ST2h.

Next, the fastening member 70 is inserted through the insertion hole 53h and the fastening hole ST2h of the device 1 to hold the replacement tooth ST. At this time, the fastening member 70 is inserted by the operator through the insertion hole 53h of the front side plate 51a, the fastening hole ST2h, and the insertion hole 53h of the rear side plate 51b in that order, and the tip side of the fastening member 70 is tightened with the nut.

Next, the rotation restriction member 80 of the device 1 is inserted into the rotation restriction hole 54h to restrict the rotation (tilt) of the replacement tooth ST. At this time, the rotation restriction member 80 is inserted into the rotation restriction hole 54h by the operator, and the tip side is tightened with a nut.

The replacement tooth ST supported by the replacement tooth receiving portion 50 is then removed from the sprocket body SB. At this time, the operator removes the connecting member (not shown) that connects the sprocket body SB and the replacement tooth ST. This removes the worn replacement tooth ST from the sprocket body SB.

Next, the device 1 lowers the replacement tooth receiving part 50 by the lifting part 10. At this time, the replacement tooth receiving part 50 is lowered by the operator operating an operating lever (not shown), etc.

FIG. 21 is an explanatory diagram showing a state in which the device 1 is rotated 90 degrees in the horizontal direction and moved from the inside to the outside of the casing CS.
FIG. 22 is an explanatory diagram showing the state in which the device 1 has been moved to the outside of the casing CS.

Next, the device 1 with the replacement tooth receiving part 50 lowered is rotated horizontally by 90 degrees by the rotating part 30 so that the orientation of the main body part 20 and the orientation of the replacement tooth receiving part 50 return to their original orientations.

Then, the device 1 moves from inside the casing CS towards the opening OP. The device 1 moves (moves forward) by the wheels 61 rotating on the temporary equipment TA (rails RA). At this time, the device 1 is pushed (or pulled) by the worker to move.

When the device 1 moves to the opening OP while supporting the replacement tooth ST, a part of the replacement tooth receiving part 50 may get caught on the upper part of the opening OP. At this time, the device 1 changes the inclination of the replacement tooth receiving part 50 by rotating the rotating part 40.

The device 1 then moves through the opening OP to the outside of the casing CS.

This removes the worn replacement teeth ST from the upper sprocket SU.

On the other hand, when installing a new replacement tooth on the upper sprocket SU, first remove the worn replacement tooth ST from the device 1, and then support the new replacement tooth on the device 1.

Note that the subsequent operation of the device to move it from the outside to the inside of the casing and attach new replacement teeth to the sprocket body is the opposite of the operation described with reference to Figures 15-22.

In this way, the device 1 is used to replace the replacement teeth ST of the upper sprocket SU.

Summary According to the embodiment described above, the device 1 includes the lifting unit 10, the main body unit 20, the rotating unit 30, the pivoting unit 40, the replacement tooth receiving unit 50, the transport unit 60, the fastening member 70, and the rotation restricting member 80. Therefore, by using the device 1, manual work is reduced. As a result, replacement teeth can be easily replaced.

In addition, according to the embodiment described above, the device 1 has a lifting unit 10. Therefore, the device 1 can raise and lower the replacement tooth receiving unit 50 to the height of the replacement tooth ST to be replaced. In other words, the worker does not lift or lower the replacement tooth ST. Therefore, the burden on the worker is reduced.

Furthermore, according to the embodiment described above, the device 1 has a rotating part 40. Therefore, the device 1 can rotate the replacement tooth receiving part 50 to any inclination angle. That is, the device 1 can rotate the replacement tooth receiving part 50 to change the angle (orientation) of the replacement tooth receiving part 50, thereby aligning the position and orientation of the replacement tooth (worn replacement tooth) to be removed from the sprocket. Therefore, when removing the replacement tooth, the worker does not need to support the replacement tooth to be replaced in accordance with the position and orientation of the replacement tooth to be replaced. Similarly, the device 1 can rotate the replacement tooth receiving part 50 to change the angle (orientation) of the replacement tooth receiving part 50, thereby aligning the position and orientation of the replacement tooth (new replacement tooth) supported by the replacement tooth receiving part 50 and attached to the sprocket to the desired attachment position and orientation of the sprocket. Therefore, when attaching the replacement tooth, the worker does not need to support the replacement tooth to be replaced in accordance with the attachment position and orientation. In this way, the worker can easily replace (remove and attach) the replacement tooth. This means the burden on workers is reduced.

Furthermore, according to the embodiment described above, the device 1 has a transport unit 60. Therefore, the device 1 can be easily moved even when it is supporting a heavy replacement tooth ST.

Furthermore, according to the embodiment described above, the device 1 has a fastening member 70. Therefore, when the replacement tooth ST is supported by the replacement tooth receiving part 50, the device 1 can reliably hold the supported replacement tooth ST. At this time, the replacement tooth ST is held by the front side plate 51a and the rear side plate 51b. Moreover, the tip of the bolt is tightened by the nut of the fastening member 70, so that the replacement tooth ST receives a surface pressure from the replacement tooth receiving part 50. In other words, the replacement tooth is sandwiched between the front side plate 51a and the rear side plate 51b, and is fixed (held) to the replacement tooth receiving part 50 by receiving the surface pressure from the front side plate 51a and the rear side plate 51b. Therefore, the holding force of the replacement tooth ST by the replacement tooth receiving part 50 is increased.

The fastening hole ST2h of the replacement tooth ST through which the fastening member 70 is inserted is an existing hole in the replacement tooth ST. In other words, this hole is a hole through which a tool held by an operator is passed to transport the replacement tooth to the sprocket body when replacing the replacement tooth by conventional manual work. In other words, the fastening hole ST2h is not a new hole made in order to use this device 1. Therefore, there is no need to create a new replacement tooth in order to use this device 1, and this device 1 can be used when replacing replacement teeth of a sprocket that has been used for a long time.

Furthermore, according to the embodiment described above, the device 1 has a rotation restriction member 80. Therefore, when the replacement tooth ST is supported by the replacement tooth receiving portion 50, the movement of the supported replacement tooth ST is restricted by the rotation restriction member 80, so that rotation (tilt) due to its own weight can be restricted.

The use of this device is not limited to tooth replacement of sprockets equipped in continuous unloaders. In other words, for example, this device may be used to replace teeth of sprockets equipped in large machinery other than continuous unloaders.

The rotation restriction member is not limited to a bolt and nut as long as it can restrict the rotation (tilt) of the replacement tooth. That is, for example, the rotation restriction member may be only a bolt. In this case, for example, the bolt may be male threaded, and the inside of the rotation restriction hole through which the bolt passes may be female threaded.

Furthermore, the replacement teeth of the sprocket that the sprocket tooth replacement device replaces are not limited to replacement teeth of the upper sprocket. That is, for example, the sprocket tooth replacement device may be used when replacing replacement teeth of the lower sprocket.

Furthermore, the device does not have to include a fastening member and a rotation restricting member. That is, for example, the fastening member and the rotation restricting member may be a jig separate from the sprocket tooth replacement device, which is used as a tooth replacement fixing jig when using the sprocket tooth replacement device. In this case, for example, the jig may be a jig in which the fastening member and the rotation restricting member are integrally configured.

Furthermore, of the fastening member and the rotation restricting member, the device may only include the fastening member, and not include the rotation restricting member. In other words, for example, if the replacement tooth supported by the replacement tooth receiving part can maintain the position supported by the replacement tooth receiving part by receiving surface pressure from the replacement tooth receiving part due to the fastening of the fastening member, then the rotation restricting member may not be necessary. In this case, the replacement tooth receiving part does not need to include a rotation restricting hole.

1 Sprocket tooth replacement device 10 Lifting section 11 Top plate 20 Main body section 21 Support section 30 Rotating section 40 Rotating section 41 Rotating shaft 42 Handle 50 Tooth replacement receiving section 51 Side plate 51a Front side plate 51b Rear side plate 52h Side plate connecting hole 53h Insertion hole 54h Rotation restriction hole 55 Side plate connecting member 60 Transport section 61 Wheel 70 Fastening member 80 Rotation restriction member UL Continuous unloader BE Bucket elevator CS Casing OP Opening (service entrance)
BC Bucket CH Chain HM Holding member S Sprocket SU Upper sprocket SL Lower sprocket SB Sprocket body SB1 Replacement tooth holding part SB1h Body side connection hole ST Replacement tooth ST1 Base part ST1h Replacement tooth side connection hole ST2 Tooth part ST2h Fastening hole ST3 Step part TA Temporary equipment FB Scaffolding fixed base RA Rail SP Scaffolding board CP Curing board

Claims (17)

A tooth replacement device for replacing tooth of a sprocket,
A replacement tooth receiving portion for supporting the replacement tooth;
A lifting unit that lifts and lowers the replacement tooth receiving unit;
and
The replacement tooth receiving portion has an insertion hole through which a fastening member for fastening the replacement tooth receiving portion and the replacement tooth is inserted.
A sprocket tooth changing device characterized by the above. a rotating portion that rotates the replacement tooth receiving portion in a rotational direction of the sprocket;
Is there,
2. The sprocket tooth changing device according to claim 1. The rotating portion is
A rotation shaft that rotatably supports the replacement tooth receiving part;
A handle attached to the replacement tooth receiving part via the pivot shaft;
Equipped with
The replacement tooth receiving portion rotates in response to the operation of the handle.
3. The sprocket tooth changing device according to claim 2. The replacement tooth receiving portion has a plurality of the insertion holes,
The rotating portion moves the replacement tooth receiving portion to a position where one of the plurality of insertion holes communicates with a fastening hole provided in the replacement tooth.
4. The sprocket tooth changing device according to claim 2 or 3. The replacement tooth receiving portion is
A pair of side plates that sandwich the replacement tooth;
A side plate connecting member that connects the side plates to each other;
Equipped with
5. A sprocket tooth changing device according to claim 1. The number of the side plate connecting members is plural.
6. The sprocket tooth changing device according to claim 5. Each of the side plates includes the insertion hole,
The replacement tooth is disposed between the pair of side plates,
The fastening member is inserted through the insertion hole of each side plate and the fastening hole of the replacement tooth.
7. The sprocket tooth changing device according to claim 5 or 6. When the fastening members are inserted through the insertion holes of the side plates and the fastening holes of the replacement teeth and fastened, the replacement teeth are clamped between the pair of side plates and are fixed to the replacement tooth receiving portion by receiving surface pressure from the pair of side plates.
8. The sprocket tooth changing device according to claim 7. The replacement tooth receiving portion has a generally crescent shape.
9. A sprocket tooth changing device according to claim 1. The replacement tooth receiving portion supports a plurality of the replacement teeth.
10. A sprocket tooth changing device according to claim 1. The replacement tooth receiving portion includes a rotation restriction hole through which a rotation restriction member is inserted to restrict rotation of the replacement tooth when the replacement tooth receiving portion supports the replacement tooth.
11. A sprocket tooth changing device according to any one of claims 1 to 10. The replacement tooth receiving portion includes a plurality of the rotation restriction holes,
A virtual line connecting the plurality of rotation restriction holes is disposed concentrically with the sprocket.
12. The sprocket tooth changing device according to claim 11. The replacement tooth receiving portion has a plurality of the insertion holes,
A virtual line connecting the plurality of insertion holes is disposed concentrically with the sprocket.
13. A sprocket tooth changing device according to any one of claims 1 to 12. A rotating part that rotates the replacement tooth receiving part;
and
The rotating unit rotates the replacement tooth receiving part with a direction in which the replacement tooth receiving part is raised and lowered by the lifting unit as a rotation axis direction.
14. A sprocket tooth changing device according to any one of claims 1 to 13. A transport unit that moves the replacement tooth receiving unit forward and backward relative to the sprocket;
Equipped with
15. A sprocket tooth changing device according to any one of claims 1 to 14. The transport unit includes wheels;
The wheels move on rails that are temporarily installed in the casing in which the sprockets are arranged.
16. The sprocket tooth changing device according to claim 15. The transport unit moves on the two rails,
Between the two rails, a scaffolding board for workers is placed.
17. The sprocket tooth changing device according to claim 16.

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