Fixing devices and transport vehicles

Abstract

The purpose of this disclosure is to provide a fixing device that allows for easy and safe attachment and detachment of a multi-stage telescopic boom. [Solution] A fixing device according to one aspect of the present disclosure is a fixing device for a multi-stage telescopic boom having a base boom and one or more telescopic booms that are extendable relative to the base boom, wherein the telescopic boom located at the furthest end has a boom head, and comprises a base located on the loading platform of a transport vehicle, a first support frame located on the base and supporting the base boom, a second support frame located on the base and supporting the boom head, and a moving mechanism that moves the first support frame and the second support frame in the longitudinal direction of the multi-stage telescopic boom while maintaining a constant distance between them, wherein the first support frame has a first support portion that supports the base boom, and the second support frame has a second support portion that supports the boom head.

Description

Technical Field

[0001] The present disclosure relates to a fixing device and a transport vehicle.

Background Art

[0002] A mobile crane including an upper slewing body and a multi-stage telescopic boom disposed on the upper slewing body is used at a construction site or the like. This mobile crane may be disassembled into an upper slewing body and a multi-stage telescopic boom and transported.

[0003] In this case, the multi-stage telescopic boom is separated before transporting the mobile crane, and is attached to the upper slewing body after being carried into the work site. Generally, the multi-stage telescopic boom separated from the upper slewing body is fixed to a fixing device disposed on the loading platform of a transport vehicle and transported (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Patent Document 1 describes a fixing device for transporting a boom, which includes a tip-side boom fixing device fixed to the front side of the vehicle on the loading platform and fixing the tip of the tip-side boom, and a base-side boom support device fixed to the rear side of the vehicle on the loading platform and supporting the base-side boom slidably with rollers. Patent Document 1 describes that when the base-side boom is extended with the tip of the tip-side boom fixed by the tip-side boom fixing device, the position of the tip-side boom remains immovable and the base-side boom slides on the rollers and moves rearward of the vehicle.

[0006] However, according to the invention described in Patent Document 1, the center of gravity of the entire boom changes when the base boom slides on the roller. As a result, the stability of the boom on the loading platform may be compromised. Furthermore, in the invention described in Patent Document 1, since the base boom slides on the roller, there is a risk of deterioration of paint or other materials occurring at the contact point between the base boom and the roller.

[0007] Patent Document 2 describes a technique for aligning a boom with the crane body while the boom is positioned on a boom transport stand. Patent Document 2 describes providing a first positioning section on the front frame of the crane body, a second positioning section on the side frame, and a third positioning section on the rear frame, aligning a pair of guide bars provided on the boom transport stand with the first and second positioning sections, and further aligning the projection pattern of a laser beam output from the base end of the boom with the third positioning section to align the boom with the crane body.

[0008] The invention described in Patent Document 2 involves an operator visually aligning the first and second alignment sections with a pair of guide bars, as well as aligning the laser beam projection pattern with the third alignment section, before extending the boom toward the boom mounting section and attaching the boom to the boom mounting section. However, extending the boom changes the boom's center of gravity, which may impair the boom's stability on the boom transport platform. Furthermore, the alignment work of the first to third alignment sections involves moving a huge trailer to make minute positional adjustments, which requires a high level of skill from the operator and may take a considerable amount of time to align the trailer.

[0009] In view of the above-mentioned inconveniences, this disclosure aims to provide a fixing device that allows for easy and safe attachment and detachment of a multi-stage telescopic boom. [Means for solving the problem]

[0010] A fixing device according to one aspect of the present disclosure made to solve the above problems is a fixing device for a multi-stage telescopic boom having a base boom and one or more telescopic booms that are extendable relative to the base boom, the telescopic boom located at the furthest end having a boom head, and comprises a base arranged on the loading platform of a transport vehicle, a first support frame arranged on the base and supporting the base boom, a second support frame arranged on the base and supporting the boom head, and a moving mechanism that moves the first support frame and the second support frame in the longitudinal direction of the multi-stage telescopic boom while maintaining a constant distance between them, with the first support frame supporting the base boom and the second support frame supporting the boom head, wherein the first support frame has a first support portion that supports the base boom, and the second support frame has a second support portion that supports the boom head. [Effects of the Invention]

[0011] A fixing device according to one aspect of this disclosure allows for easy and safe attachment and detachment of a multi-stage telescopic boom. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a schematic perspective view showing a fixing device according to one embodiment of the present disclosure and a transport vehicle on which the fixing device is installed. [Figure 2] Figure 2 is a schematic perspective view showing the fixing device of Figure 1. [Figure 3] Figure 3 is a schematic perspective view showing the first support frame in the fixing device of Figure 2 supporting the base boom. [Figure 4] Figure 4 is a schematic perspective view showing the second support frame in the fixing device of Figure 2 supporting the boom head. [Figure 5] Figure 5 is a schematic side view showing the procedure for attaching the multi-stage telescopic boom to the upper slewing body using the fixing device shown in Figure 2. [Figure 6] Figure 6 is a schematic side view showing the next steps in Figure 5 for attaching the multi-stage telescopic boom to the upper slewing body using the fixing device shown in Figure 2. [Figure 7] Figure 7 is a schematic side view showing the next steps in Figure 6 for attaching the multi-stage telescopic boom to the upper slewing body using the fixing device shown in Figure 2. [Modes for carrying out the invention]

[0013] [Description of Embodiments in this Disclosure] First, the embodiments of this disclosure will be listed and described.

[0014] (1) A fixing device according to one aspect of the present disclosure is a fixing device for a multi-stage telescopic boom having a base boom and one or more telescopic booms that are extendable relative to the base boom, wherein the telescopic boom located at the furthest end has a boom head, and comprises a base located on the loading platform of a transport vehicle, a first support frame located on the base and supporting the base boom, a second support frame located on the base and supporting the boom head, and a moving mechanism that moves the first support frame and the second support frame in the longitudinal direction of the multi-stage telescopic boom while maintaining a constant distance between them, with the first support frame supporting the base boom and the second support frame supporting the boom head, wherein the first support frame has a first support portion that supports the base boom, and the second support frame has a second support portion that supports the boom head.

[0015] In this fixing device, the first support frame supports the base boom, and the second support frame supports the boom head. The first and second support frames maintain a constant distance from each other while moving the multi-stage telescopic boom in its longitudinal direction. As a result, the center of gravity of the multi-stage telescopic boom remains constant relative to the first and second support frames while it is supported by them, and the load applied to the first and second support frames does not change while the multi-stage telescopic boom is supported. Therefore, the posture of the multi-stage telescopic boom is stable while it is supported by the first and second support frames. Consequently, this fixing device allows for easy and safe attachment and detachment of the multi-stage telescopic boom.

[0016] (2) In the above (1), the first support portion may have a pair of concave grooves arranged at intervals in the width direction of the proximal boom. According to this aspect, the proximal boom can be stably held.

[0017] (3) In the above (1) or (2), the second support portion may have a pair of annular fixing portions arranged at intervals in the width direction of the boom head. According to this aspect, the boom head can be stably held.

[0018] (4) In any one of the above (1) to (3), the first support pedestal may have an alignment mechanism for aligning the proximal boom in the width direction in a state supported by the first support portion. According to this aspect, for example, regardless of the skill of the operator of the transport vehicle, the proximal boom can be easily aligned with respect to the upper swing body, and the proximal boom can be easily attached to the upper swing body. As a result, delicate alignment of the transport vehicle is not required, and the working time can be shortened.

[0019] (5) In any one of the above (1) to (4), the first support pedestal may have a first height adjustment mechanism for adjusting the height and inclination of the proximal boom supported by the first support portion. According to this aspect, for example, regardless of the skill of the operator of the transport vehicle, the proximal boom can be easily aligned with respect to the upper swing body, and the proximal boom can be easily attached to the upper swing body.

[0020] (6) In any one of the above (1) to (5), the second support pedestal may have a second height adjustment mechanism for adjusting the height and inclination of the boom head supported by the second support portion. According to this aspect, the posture of the multi-stage telescopic boom fixed to the fixing device can be easily and stably maintained.

[0021] (7) In any of (1) to (6) above, the moving mechanism may have a cylinder that is connected to and extends and retracts from at least one of the first support frame and the second support frame. According to this embodiment, by moving at least one of the first support frame and the second support frame, which are spaced apart from each other via the multi-stage telescopic boom, the multi-stage telescopic boom can be easily moved while keeping the center of gravity relative to the first support frame and the second support frame constant.

[0022] (8) In any of (1) to (7) above, the first support portion is a first shaft support portion that supports a shaft located on the ventral side of the base boom, and the second support portion is a second shaft support portion that supports shafts protruding from both sides in the width direction of the boom head. According to this embodiment, the multi-stage telescopic boom can be attached to and detached from the upper slewing body more easily and safely.

[0023] A transport vehicle according to another aspect of this disclosure is equipped with any of the fixing devices described in (1) to (8) above.

[0024] Since the transport vehicle is equipped with the aforementioned fixing device, the multi-stage telescopic boom can be attached and detached easily and safely.

[0025] In this disclosure, the "ventral side" of the boom refers to the side that is vertically downward when the boom is laid down (the side closer to the ground).

[0026] [Details of the Embodiments of the Invention] The embodiments of this disclosure will be described in detail below, with reference to the drawings as appropriate. Note that the figures are schematic and may not correspond to actual dimensions, proportions, etc.

[0027] [First Embodiment] The fixing device 1 shown in Figures 1 and 2 is a fixing device for a multi-stage telescopic boom 110, which has a base boom 120 and one or more telescopic booms 130 that are extendable relative to the base boom 120, with the telescopic boom 130 located at the furthest end having a boom head 130a. The fixing device 1 comprises a base 10 placed on the loading platform 2a of a transport vehicle 2, a first support frame 20 placed on the base 10 and supporting the base boom 120, a second support frame 30 placed on the base 10 and supporting the boom head 130a, and a moving mechanism 40 that moves the first support frame 20 and the second support frame 30 in the longitudinal direction of the multi-stage telescopic boom 110 while maintaining a constant distance between them, with the first support frame 20 supporting the base boom 120 and the second support frame 30 supporting the boom head 130a. As shown in Figures 2 and 3, the first support frame 20 has a first support portion 21 that supports the base boom 120. The first support section 21 supports, for example, the base boom 120 at at least two points in the width direction. As shown in Figures 2 and 4, the second support frame 30 has a second support section 31 that supports the boom head 130a. The second support section 31 supports, for example, the boom head 130a at at least two points in the width direction. The fixing device 1 may also include a cable carrier 50 for protecting cables, etc., that move along with the first support frame 20, etc.

[0028] In the fixing device 1, the first support frame 20 supports the base boom 120, and the second support frame 30 supports the boom head 130a. The first support frame 20 and the second support frame 30 move the multi-stage telescopic boom 110 in its longitudinal direction while maintaining a constant distance between them. As a result, the center of gravity of the multi-stage telescopic boom 110 remains constant relative to the first support frame 20 and the second support frame 30 while it is supported by the first support frame 20 and the second support frame 30, and the load applied to the first support frame 20 and the second support frame 30 does not change while the multi-stage telescopic boom 110 is supported. Therefore, the posture of the multi-stage telescopic boom 110 is stable while it is supported by the first support frame and the second support frame. Furthermore, the fixing device 1 improves the stability of the posture of the multi-stage telescopic boom 110 when it is moved by the moving mechanism 40, etc., because the first support portion 21 supports the base boom 120 at at least two points in the width direction, and the second support portion 31 supports the boom head 130a at at least two points in the width direction. Therefore, the fixing device 1 allows for easy and safe attachment and detachment of the multi-stage telescopic boom 110.

[0029] The fixing device 1 does not require the multi-stage telescopic boom 110 to slide relative to the first support frame 20 and the second support frame 30 when attaching or detaching the multi-stage telescopic boom 110. Therefore, the fixing device 1 can suppress deterioration such as peeling of paint on the multi-stage telescopic boom 110 caused by sliding, and the increase in maintenance costs due to deterioration. In addition, since the support points of the multi-stage telescopic boom 110 by the first support part 21 and the second support part 31 do not change, and the relative position between the first support part 21 and the second support part 31 and the center of gravity of the multi-stage telescopic boom 110 does not change, the multi-stage telescopic boom 110 can be held stably. Furthermore, since no special mechanism is required to avoid obstacles on the underside of the boom, the multi-stage telescopic boom 110 can be held stably while ensuring work safety.

[0030] <Transport Vehicles> As described above, the fixing device 1 is positioned on the cargo bed 2a of the transport vehicle 2. The transport vehicle 2 on which the fixing device 1 is positioned is itself an embodiment of the present disclosure. The type of transport vehicle 2 is not particularly limited, but examples include a trailer. Since the transport vehicle 2 is equipped with the fixing device 1, the multi-stage telescopic boom 110 can be attached and detached easily and safely.

[0031] <Construction machinery> The fixing device 1 is used when transporting a multi-stage telescopic boom 110 attached to the upper slewing body 220 in a construction machine 100 having a lower traveling body 210 and an upper slewing body 220. More specifically, the fixing device 1 is used when transporting the multi-stage telescopic boom 110, which has been detached from the upper slewing body 220, to the work site separately from the lower traveling body 210 and the upper slewing body 220, and when attaching the multi-stage telescopic boom 110 to the upper slewing body 220 at the work site.

[0032] The construction machine 100 is not particularly limited in type, but an example is a crane equipped with a telescopic boom as a multi-stage telescopic boom 110. The lower traveling body 210 has, for example, a jack-up 210a and crawler units (not shown) arranged on both sides of the jack-up 210a in the vehicle width direction. The upper slewing body 220 has a slewing frame 220a. The slewing frame 220a has a boom mounting portion that swingably supports the multi-stage telescopic boom 110 and a luffing cylinder for luffing the multi-stage telescopic boom 110. The boom mounting portion has a second pin hole arranged coaxially with a first pin hole described later provided on the base boom 120, and a boom pin that is inserted through these pin holes when the first pin hole and the second pin hole are arranged coaxially. The luffing cylinder has a cylinder rod with a third pin hole provided at its tip.

[0033] The multi-stage telescopic boom 110 is a telescopic boom and has a base boom 120 as an outer cylinder and one or more telescopic booms 130 as inner cylinders that are extended and retractable relative to the base boom 120 on the inner circumference side of the base boom 120. The base boom 120 has the first pin hole described above at its base end. The underside of the base boom 120 has a cylinder rod mounting portion to which the cylinder rod is attached and a first sheave 140 through which a hook rope (not shown) is stretched. The first sheave 140 is a direction changing sheave for changing the direction of a hook rope, for example, that is unfurled from a winch. The cylinder rod mounting portion is arranged coaxially with the third pin hole and has a fourth pin hole through which a cylinder pin is inserted. As shown in Figure 3, the first sheave 140 is supported by a first shaft 150 on the underside of the base boom 120. The first shaft 150 extends in the width direction of the base boom 120. In addition, depending on the specifications of the multi-stage telescopic boom, there may be configurations that do not have the first sheave 140. In this case, the first shaft 150 may be arranged independently on the base boom 120.

[0034] In the multi-stage telescopic boom 110, the telescopic boom 130 located at the foremost end has a boom head 130a. The boom head 130a has a second sheave 160 through which a hook rope, which is stretched across the first sheave 140, is passed. As shown in Figure 4, the second sheave 160 is supported by a second shaft 170 that extends in the width direction of the boom head 130a. The second shaft 170 protrudes from both sides of the boom head 130a in the width direction.

[0035] (Base) The base 10, when positioned on the loading platform 2a of the transport vehicle 2, has a pair of rails 11 that face each other in the width direction of the loading platform 2a and extend in the direction of travel of the loading platform 2a, and a weight 12 positioned at the front end of the pair of rails 11 (the front end in the direction of travel of the transport vehicle 2).

[0036] The pair of rails 11 are configured to allow the first support frame 20 and the second support frame 30 to move along their longitudinal direction. The specific structure of the pair of rails 11 is not particularly limited, but from the viewpoint of reliably preventing the first support frame 20 and the second support frame 30 from lifting off the pair of rails 11, the structure can be configured to support the wheels 22 and 32 of the first support frame 20 and the second support frame 30, described later, from above and below.

[0037] The weight 12 maintains the overall weight balance of the fixing device 1 when the multi-stage telescopic boom 110 is supported by the first support frame 20 and the second support frame 30. As will be described later, in the fixing device 1, when supported by the first support frame 20 and the second support frame 30, the center of gravity G of the multi-stage telescopic boom 110 may be located behind the first support frame 20 (rearward in the direction of travel of the transport vehicle 2). In this regard, the fixing device 1 has the weight 12 at the front end of the pair of rails 11, which prevents the front end portions of the pair of rails 11 from lifting up and the entire fixing device 1 and the multi-stage telescopic boom 110 from tilting backward.

[0038] (First support frame) The first support frame 20 is provided so as to be able to travel along a pair of rails 11. As shown in Figure 2, the first support frame 20 has a first support section 21 that supports the base boom 120 and wheels 22 that travel along the pair of rails 11. The first support frame 20 also has an alignment mechanism 23 that aligns the base boom 120 in the width direction while it is supported by the first support section 21, and a first height adjustment mechanism 24 that adjusts the height and inclination of the base boom 120 supported by the first support section 21. Furthermore, the first support frame 20 has a first support base 25 on which the first support section 21, wheels 22, alignment mechanism 23, and first height adjustment mechanism 24 are arranged.

[0039] As shown in Figure 3, the first support portion 21 has a pair of grooves 21a that are spaced apart in the width direction of the base boom 120. The pair of grooves 21a individually support a portion of the base boom 120. Thus, the first support portion 21 is configured to support the base boom 120 at two points in the width direction. The fixing device 1 can stably hold the base boom 120 by having a pair of grooves 21a.

[0040] The pair of grooves 21a are provided such that the direction of groove formation (the direction in which the grooves extend) is parallel to the width direction of the base boom 120. The pair of grooves 21a are also provided to support the first shaft 150 described above. In other words, the first support portion 21 is a first shaft support portion that supports the shaft located on the ventral side of the base boom 120. The pair of grooves 21a support the first shaft 150 so that it can slide in the axial direction.

[0041] The wheels 22 are arranged, for example, two on each side in the width direction of the first support base 25. The fixing device 1 uses channel steel for the rail 11 and tapered treads for the wheels 22, which allows the first support frame 20 to be moved easily and reliably in parallel.

[0042] The alignment mechanism 23 may be configured to slide the base boom 120 in the width direction relative to the first support portion 21 when the base boom 120 is positioned on the first support portion 21, or it may be configured to slide the first support portion 21 together with the base boom 120 in the width direction. In this embodiment, the alignment mechanism 23 slides the base boom 120 in the width direction relative to the first support portion 21.

[0043] As shown in Figure 3, the alignment mechanism 23 has a pair of alignment cylinders 23a capable of pressing the first shaft 150 from the axial direction so that the first shaft 150 slides axially relative to the first support portion 21. The pair of alignment cylinders 23a are arranged opposite each other in the width direction of the base boom 120 and are provided to be able to move back and forth in opposing directions. The type of the pair of alignment cylinders 23a is not particularly limited, and known cylinders can be used.

[0044] The fixing device 1, having a positioning mechanism 23, allows for easy positioning of the base boom 120 relative to the upper slewing body 220 and easy attachment of the base boom 120 to the upper slewing body 220, regardless of the skill level of the operator of the transport vehicle 2. More specifically, in the fixing device 1, the multi-stage telescopic boom 110 is first roughly positioned relative to the boom mounting section while it is fixed. Then, by fine-tuning the position of the base boom 120 using the positioning mechanism 23, the widthwise position of the multi-stage telescopic boom 110 can be easily aligned with the boom mounting section while keeping the required operating skill level of the operator low. As a result, precise positioning of the transport vehicle becomes unnecessary, and working time can be reduced.

[0045] Furthermore, by using a pair of alignment cylinders 23a as the alignment mechanism 23, the fixing device 1 does not require the operator to directly work under the multi-stage telescopic boom 110 when the alignment mechanism 23 is used. As a result, the fixing device 1 ensures the safety of the operator during operation.

[0046] The first height adjustment mechanism 24 adjusts the height and inclination (inclination in the width direction of the base boom 120) of the base boom 120 by adjusting the height of the first support portion 21. More specifically, the first height adjustment mechanism 24 adjusts the height and inclination of the base boom 120 supported by the pair of grooves 21a by individually controlling the height of the pair of grooves 21a.

[0047] A specific configuration of the first height adjustment mechanism 24 is, for example, a first height adjustment cylinder, which is positioned between a pair of grooves 21a and the first support base 25. The first height adjustment cylinders are configured to move back and forth in the direction normal to the first support base 25 (a direction perpendicular to the loading platform 2a of the transport vehicle 2) so as to adjust the height of the grooves 21a relative to the first support base 25. The type of the pair of first height adjustment cylinders is not particularly limited, and known cylinders can be used.

[0048] The fixing device 1 has a first height adjustment mechanism 24, which allows the base boom 120 to be easily aligned with the upper slewing body 220 and the base boom 120 to be easily attached to the upper slewing body 220, regardless of the skill level of the operator of the transport vehicle 2. More specifically, in the fixing device 1, the multi-stage telescopic boom 110 is first roughly aligned with the boom mounting section while it is fixed in place. Then, by fine-tuning the position of the base boom 120 using the first height adjustment mechanism 24, the height and inclination of the multi-stage telescopic boom 110 can be easily adjusted with respect to the boom mounting section while keeping the required operating skill level of the operator low.

[0049] Furthermore, by using the first height adjustment cylinder as the first height adjustment mechanism 24 of the fixing device 1, the operator is not required to directly work under the multi-stage telescopic boom 110 when aligning using the first height adjustment mechanism 24. As a result, the safety of the operator during operation can be ensured with the fixing device 1.

[0050] (Second support frame) The second support frame 30 is provided so as to be able to travel along a pair of rails 11. As shown in Figure 2, the second support frame 30 has a second support section 31 that supports the boom head 130a and wheels 32 that travel along the pair of rails 11. The second support frame 30 also has a second height adjustment mechanism 34 that adjusts the height and inclination of the boom head 130a supported by the second support section 31. Furthermore, the second support frame 30 has a second support base 35 on which the second support section 31, wheels 32, and second height adjustment mechanism 34 are arranged.

[0051] As shown in Figure 4, the second support portion 31 has a pair of annular fixing portions 31a that are spaced apart in the width direction of the boom head 130a. Each of the pair of annular fixing portions 31a is configured to support a rod member that protrudes in the width direction of the boom head 130a, and more specifically, is configured to support a second shaft 170 that protrudes in the width direction of the boom head 130a. The second support portion 31 is configured to support the boom head 130a at two points in the width direction by supporting rod members that protrude on both sides of the boom head 130a in the width direction. The fixing device 1 can stably hold the boom head 130a by having a pair of annular fixing portions 31a. More specifically, as described above, in the fixing device 1, when supported by the first support frame 20 and the second support frame 30, the center of gravity G of the multi-stage telescopic boom 110 may be located behind the first support frame 20. In this regard, the fixing device 1, having a second support portion 31 that has a pair of annular fixing portions 31a, can easily and reliably prevent the tip of the multi-stage telescopic boom 110 from lifting up.

[0052] As shown in Figure 4, each pair of annular fixing portions 31a comprises a first member 36 having a groove and a second member 37 fixed to the first member 36 with the rod member sandwiched between them. The first member 36 and the second member 37 are configured to be engageable by an engagement pin or the like.

[0053] As described above, the second support portion 31 supports the second shaft 170 that protrudes from both sides in the width direction of the boom head 130a. In other words, the second support portion 31 is a second shaft support portion that supports the shafts that protrude from both sides in the width direction of the boom head 130a.

[0054] The fixing device 1 allows for easier and safer attachment and detachment of the multi-stage telescopic boom 110 to and from the upper slewing body, as the first support portion 21 is the first shaft support portion and the second support portion 31 is the second shaft support portion. In other words, the fixing device 1 supports the base boom 120 with the first support portion 21 and the boom head 130a with the second support portion 31, and by not extending or retracting the multi-stage telescopic boom 110, the distance between the first support frame 20 and the second support frame 30 can be kept constant. At this time, because the first support portion 21 is the first shaft support portion and the second support portion 31 is the second shaft support portion, the multi-stage telescopic boom 110 can be stably held while keeping the center of gravity position constant relative to the first support frame 20 and the second support frame 30. As a result, the fixing device 1 allows for easier and safer attachment and detachment of the multi-stage telescopic boom 110 to and from the upper slewing body.

[0055] The wheels 32 are arranged, for example, two on each side in the width direction of the second support base 35. The fixing device 1 uses channel steel for the rail 11 and tapered treads for the wheels 32, which allows the second support frame 30 to be moved easily and reliably in parallel.

[0056] The second height adjustment mechanism 34 adjusts the height and tilt (tilt in the width direction of the boom head 130a) of the boom head 130a by adjusting the height of the second support portion 31. More specifically, the second height adjustment mechanism 34 adjusts the height and tilt of the boom head 130a supported by the pair of annular fixing portions 31a by individually controlling the height of the pair of annular fixing portions 31a.

[0057] A specific configuration of the second height adjustment mechanism 34 is, for example, a second height adjustment cylinder, which is positioned between a pair of annular fixing parts 31a and a second support base 35. The second height adjustment cylinder is configured to move back and forth in the direction normal to the second support base 35 (a direction perpendicular to the cargo bed 2a of the transport vehicle 2) so as to adjust the height of the annular fixing parts 31a relative to the second support base 35. The type of the pair of second height adjustment cylinders is not particularly limited, and known cylinders can be used.

[0058] The fixing device 1 has a second height adjustment mechanism 34, which allows the posture of the multi-stage telescopic boom 110 fixed to the fixing device 1 to be easily and stably maintained.

[0059] The fixing device 1 uses the second height adjustment cylinder as the second height adjustment mechanism 34, so that the operator does not need to work directly under the multi-stage telescopic boom 110 when the positioning mechanism 23 is used for positioning. As a result, the fixing device 1 ensures the safety of the operator during operation.

[0060] (Moving mechanism) The moving mechanism 40 moves the first support frame 20 and the second support frame 30 in the longitudinal direction of the multi-stage telescopic boom 110 while maintaining a constant distance between them. The moving mechanism 40 may itself have a structure that maintains the distance between the first support frame 20 and the second support frame 30. Alternatively, the moving mechanism 40 may be designed to maintain the distance between the first support frame 20 and the second support frame 30 by not extending or retracting the multi-stage telescopic boom 110 while it is supported by the first support frame 20 and the second support frame 30.

[0061] The moving mechanism 40 has a cylinder (moving cylinder 41) that is connected to at least one of the first support frame 20 and the second support frame 30 and extends and retracts. The moving cylinder 41 may be connected to the first support frame 20 only, to the second support frame 30 only, or to both the first support frame 20 and the second support frame 30. In this embodiment, the moving cylinder 41 is connected to the first support frame 20 only.

[0062] The moving cylinder 41 extends along the rail 11. By moving back and forth in the longitudinal direction of the pair of rails 11, the moving cylinder 41 moves the first support frame 20 and the second support frame 30 to a desired position relative to the rail 11 while maintaining a constant distance between them and supporting the multi-stage telescopic boom 110. The type of moving cylinder 41 is not particularly limited, and known cylinders can be used.

[0063] The moving mechanism 40, having a moving cylinder 41, can easily move the multi-stage telescopic boom 110 while maintaining the center of gravity relative to the first support frame 20 and the second support frame 30, which are spaced apart from each other via the multi-stage telescopic boom 110, by moving at least one of the first support frame 20 and the second support frame 30.

[0064] <Instructions for attaching and detaching> Next, the procedure for attaching and detaching the multi-stage telescopic boom 110 to the fixing device 1 will be explained.

[0065] (Installation procedure) First, referring to Figures 5 to 7, the procedure for attaching the multi-stage telescopic boom 110, which is fixed to the fixing device 1, to the upper slewing body 220 will be explained. In Figure 5, the multi-stage telescopic boom 110 is fixed to the loading platform 2a by lashing X in addition to the first support frame 20 and the second support frame 30. Also in Figure 5, a wooden block Y is placed between the multi-stage telescopic boom 110 and the loading platform 2a as a spacer.

[0066] To attach the multi-stage telescopic boom 110, which is fixed to the fixing device 1, to the upper slewing body 220, first, as shown in Figure 5, the transport vehicle 2 is parked in front of the upper slewing body 220 so that the center of the boom attachment part on the upper slewing body 220 and the center of the multi-stage telescopic boom 110 roughly coincide in the width direction of the loading platform 2a.

[0067] Next, as shown in Figure 6, the lashing X and block Y are removed, and the position of the multi-stage telescopic boom 110 is finely adjusted using the alignment mechanism 23 of the first support frame 20, while the first support frame 20 and the second support frame 30 are moved backward using the moving mechanism 40. Furthermore, the multi-stage telescopic boom 110 is brought closer to the boom mounting portion of the upper slewing body 220 using the moving mechanism 40 so that the first pin hole provided on the base boom 120 and the second pin hole provided on the boom mounting portion are located coaxially, and the multi-stage telescopic boom 110 is aligned in the width direction of the boom mounting portion (width direction of the upper slewing body 220) using the alignment mechanism 23, and the multi-stage telescopic boom 110 is aligned in the height direction of the boom mounting portion (height direction of the upper slewing body 220) using the first height adjustment mechanism 24.

[0068] Next, as shown in Figure 7, the boom pin is inserted through the first and second pin holes, which are arranged coaxially, and the third pin hole provided in the luffing cylinder is positioned coaxially with the fourth pin hole provided in the base boom 120, and the cylinder pin is then inserted through these pin holes.

[0069] Finally, the multi-stage telescopic boom 110 is removed from the fixing device 1 by releasing the engagement between the first member 36 and the second member 37 in the pair of annular fixing parts 31a provided on the second support frame 30.

[0070] (Removal procedure) The procedure for removing the multi-stage telescopic boom 110 from the upper slewing body 220 and then fixing it to the fixing device 1 will be described below.

[0071] First, the fixing device 1 is placed on the cargo bed 2a of the transport vehicle 2. The fixing device 1 is secured to the cargo bed 2a, for example, by tying it down. Then, with the first support frame 20 positioned at the rear end of the pair of rails 11, the fixing device 1 is parked in front of the construction machine 100. Furthermore, with the multi-stage telescopic boom 110 attached to the boom mounting section of the upper slewing body 220 fully retracted (all telescopic booms 130 retracted), the multi-stage telescopic boom 110 is placed on the first support frame 20 and the second support frame 30.

[0072] Next, the multi-stage telescopic boom 110 is positioned on the first support section 21 and the second support section 31 while adjusting the alignment mechanism 23 and the first height adjustment mechanism 24 on the first support frame 20 and the second height adjustment mechanism 34 on the second support frame 30. At this time, in the second support section 31, the rod members protruding from both sides in the width direction of the boom head 130a are fixed by the annular fixing section 31a.

[0073] Next, the multi-stage telescopic boom 110 is removed from the upper slewing body 220. Specifically, the boom pins are removed from the first and second pin holes, and the cylinder pins are removed from the third and fourth pin holes.

[0074] Next, the first support frame 20 and the second support frame 30 are moved forward of the loading platform 2a by the moving mechanism 40 so that the multi-stage telescopic boom 110 is positioned on the loading platform 2a over approximately its entire length. At this time, the relative positions of the first support frame 20 and the second support frame 30 are kept constant via the multi-stage telescopic boom 110, and the center of gravity of the multi-stage telescopic boom 110 does not change with respect to the first support frame 20 and the second support frame 30.

[0075] Finally, a wooden block Y is placed between the multi-stage telescopic boom 110 and the loading platform 2a, and the heights of the first support section 21 and the second support section 31 are reduced by the first height adjustment mechanism 24 and the second height adjustment mechanism 34 to keep the multi-stage telescopic boom 110 horizontal to the loading platform 2a. Then, the multi-stage telescopic boom 110 is fixed to the loading platform 2a by the lashing X. As a result, the multi-stage telescopic boom 110 is fixed to the fixing device 1.

[0076] [Other embodiments] The above embodiments do not limit the configuration of the present invention. Therefore, the above embodiments allow for the omission, substitution, or addition of components of each part of the above embodiments based on the description herein and common technical knowledge, and all such omissions, substitutions, or additions should be interpreted as falling within the scope of the present invention.

[0077] For example, in the above embodiment, a configuration was described in which the first support frame and the second support frame each support the multi-stage telescopic boom at two points. However, one or both of the first and second support frames may be configured to support the multi-stage telescopic boom at one point. Furthermore, in the fixing device, one or both of the first and second support frames may support the multi-stage telescopic boom at three or more points. Moreover, although the fixing device can fix the multi-stage telescopic boom using only the two support frames, the first and second support frames, this does not exclude configurations that further include support frames other than the first and second support frames.

[0078] The specific structures of the first and second support parts are not limited to those described in the above embodiment. The specific structures of the first and second support parts can be designed according to the specifications of the multi-stage telescopic boom, etc. For example, the first support part may be configured to support the underside of the base boom. The second support part may be configured to support the bracket of the boom head, etc.

[0079] The fixing device may be configured without the alignment mechanism described above. Furthermore, the alignment mechanism may be configured in a manner other than that described in the above embodiment. For example, the alignment mechanism may include a lever hoist. In this case, the base boom can be aligned in the width direction by pulling it with the lever hoist.

[0080] The fixing device may also be configured without one or both of the first and second height adjustment mechanisms described above. For example, even without the second height adjustment mechanism, the base boom can be easily aligned with the boom mounting section.

[0081] In the above embodiment, a configuration was described in which the first height adjustment mechanism adjusts the height and inclination of the base boom. However, the first height adjustment mechanism may be provided to adjust only one of the height and inclination of the base boom. Also, in the above embodiment, a configuration was described in which the second height adjustment mechanism adjusts the height and inclination of the boom head. However, the second height adjustment mechanism may be provided to adjust only one of the height and inclination of the boom head.

[0082] The above-mentioned moving mechanism may employ configurations other than the moving cylinder described above. For example, the moving mechanism may use a winch to move the first support frame and the second support frame. In this case, it may have a first winch for pulling the first support frame and a second winch for pulling the second support frame. [Explanation of Symbols]

[0083] 1 Fixing device 2. Transport vehicles 2a Cargo bed 10 bases 11 rails 12 weights 20. First support frame 21 1st support part 21a Groove 22 wheels 23 Alignment mechanism 23a Alignment Cylinder 24. First height adjustment mechanism 25 1st support stand 30. Second support frame 31 Second support part 31a Annular fixing part 32 wheels 34. Second height adjustment mechanism 35 Second support stand 36. First component 37 Second Member 40 Moving mechanism 41. Mobile cylinder 50 Cable Carriers 100 Construction Machinery 110 Multi-section telescopic boom 120 Base Boom 130 Telescopic Boom 130a boom head 140 First Sheave 150 First shaft 160 Second Sheave 170 Second shaft 210 Lower running body 210a Jacking up 220 Upper rotating body 220a Swivel Frame G Center of gravity of the multi-stage telescopic boom X Lashing Y-shaped wooden block

Claims

1. A fixing device for a multi-stage telescopic boom having a base boom and one or more telescopic booms that are extendable relative to the base boom, wherein the telescopic boom positioned at the far end has a boom head, A base that is placed on the cargo bed of a transport vehicle, A first support frame is positioned on the base and supports the base boom, A second support frame is positioned on the base mentioned above and supports the boom head, With the first support frame supporting the base boom and the second support frame supporting the boom head, a moving mechanism moves the first support frame and the second support frame in the longitudinal direction of the multi-stage telescopic boom while maintaining a constant distance between them. It is equipped with, The above-mentioned first support frame has a first support portion that supports the base boom, The above-mentioned second support frame has a second support portion that supports the boom head. Fixation device.

2. The fixing device according to claim 1, wherein the first support portion has a pair of grooves arranged at intervals in the width direction of the base boom.

3. The fixing device according to claim 1, wherein the second support portion has a pair of annular fixing portions that are spaced apart in the width direction of the boom head.

4. The fixing device according to claim 1, wherein the first support frame has an alignment mechanism for aligning the base boom, which is supported by the first support portion, in the width direction.

5. The fixing device according to claim 1, wherein the first support frame has a first height adjustment mechanism for adjusting the height and inclination of the base boom supported by the first support portion.

6. The fixing device according to claim 1, wherein the second support frame has a second height adjustment mechanism for adjusting the height and inclination of the boom head supported by the second support portion.

7. The above-mentioned moving mechanism is The fixing device according to claim 1, comprising a cylinder that is connected to at least one of the first support frame and the second support frame and is extendable and retractable.

8. The above-mentioned first support portion is a first shaft support portion that supports a shaft located on the ventral side of the base boom, The fixing device according to claim 1, wherein the second support portion is a second shaft support portion that supports shafts protruding from both sides in the width direction of the boom head.

9. A transport vehicle equipped with the fixing device described in any one of claims 1 to 8.

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