JP3223367U - Lifting work platform - Google Patents

Abstract

In an elevating work table ship, the elevating efficiency of the elevating work table ship is improved by reducing standby steps when the main body of the ship is raised and lowered. An elevating work platform ship includes a leg 10 having pads 12 arranged in the up and down direction, a main body S, and an elevating device 1. The elevating device is a housing 20 fixed to the main body. A first frame 30 provided with first engaging means 33 that is accommodated in the housing so as to be movable in the axial direction and can be engaged with and disengaged from the pad; A second frame 40 having a second engaging means 43 that can be engaged and disengaged, and first and second cylinders 50 and 60 for moving the first and second frames relative to the housing in the axial direction; The maximum stroke amounts of the first cylinder and the second cylinder coincide with one pitch in the vertical direction of the plurality of pads. [Selection] Figure 1

Description

  The present invention relates to an elevating work platform ship.

  In general, at the time of offshore civil engineering work on the sea surface, it is necessary to secure a work place for carrying out the work by installing necessary equipment according to the contents of the work. A work boat is used as a work place on the sea surface.

  As this type of work trolley, for example, as shown in FIG. 10, a trolley main body S, a plurality of legs 110... 110 fixed by landing on the seabed, and a trolley main body for each leg 110. An elevating work table ship including an elevating device 100 for elevating S is known.

  The elevating device 100 is usually provided at each of the four corners of the main body S, and is configured to elevate the main body S along each leg 110. Thereby, for example, it is possible to maintain a state in which the main body S is raised to a height where waves do not reach. As a result, it is possible to prevent the carriage main body S from being shaken due to waves or the like, and to improve the work efficiency and accuracy at sea.

  As shown in FIGS. 11 to 12, the lifting device 100 includes a housing 120 in which a leg 110 including a plurality of pads 112... 112 is inserted and fixed to the main body S, and a vertical direction with respect to the housing 120. The upper frame 130 including the first engagement means 133 that is accommodated in the (in the axial direction of the leg 110) and that can be engaged with and disengaged from the plurality of pads 112. The lower frame 140 provided with the second engaging means 143 that can be received in a fixed state (fixed) and can be engaged with and disengaged from the plurality of pads 112... 112 and the upper frame 130 relative to the housing 120. An elevating cylinder 150 to be moved is provided.

  Specifically, the leg 110 includes a cylindrical portion 111 extending vertically and a plurality of pads 112... 112 protruding outward from the outer peripheral wall of the cylindrical portion 111. The plurality of pads 112... 112 are arranged at equal intervals in the circumferential direction and arranged at equal pitches in the vertical direction. The housing 120 is formed in a cylindrical shape, and an opening 123 for inserting the leg 110 is provided in the ceiling portion 122 of the housing 120.

  The upper frame 130 has a main body 131 formed in a cylindrical shape as a whole, and the leg 110 is inserted through the main body 131. The upper frame 130 is connected to the housing 120 via a lifting cylinder 150 described later.

  The first engaging means 133 is included in the upper frame 130. The first engaging means 133 has a cylindrical portion 134 having a smaller diameter than the upper frame 130 and a plurality of engaging portions 135... 135 projecting inward from the inner peripheral wall of the upper portion of the cylindrical portion 134. ing.

  In the non-engaged state shown in FIG. 12A, the plurality of engaging portions 135... 135 are provided at positions that do not overlap with the plurality of pads 112... 112 of the leg 110 in plan view (as viewed in the axial direction). Yes. The first engagement means 133 is attached to the leg 110 and the housing 120 so as to be relatively movable in the vertical direction (axial direction) and the circumferential direction.

  An arm portion 136 is joined to the outer peripheral wall of the cylindrical portion 134 of the first engagement means 133. The arm 136 passes through an opening 131 a provided in the main body 131 of the upper frame 130 and extends to a radial position between the inner peripheral wall of the housing 120 and the outer peripheral wall of the upper frame 130.

  One end of the locking cylinder 137 is connected to the radially outer end of the arm 136. The other end of the locking cylinder 137 is connected to the upper frame 130 via a connecting member 131b. The arm 136 moves along the opening 131 a of the upper frame 130 by the expansion and contraction of the locking cylinder 137. As a result, the first engaging means 133 connected to the arm portion 136 can move in the circumferential direction with respect to the leg 110.

  Due to the expansion and contraction of the locking cylinder 137, the engaging portions 135... 135 of the first engaging means 133 and the plurality of pads 112... 112 of each leg 110 are not overlapped as shown in FIG. ) And an overlapping state (engaged state) in a plan view (as viewed in the axial direction) shown in FIG. 12B.

  As shown in FIG. 11, each engagement portion 135 of the first engagement means 133 can be engaged with each pad 112 of the leg 110 from above as seen from the radial direction (side view) of the leg 110. Has been.

  As shown in FIG. 12A, four elevating cylinders 150 are provided at equal intervals along the outer peripheral wall of the upper frame 130. The lower end portion of each elevating cylinder 150 is connected to the upper frame 130 via the connection member 151, and the upper end portion is connected to the ceiling portion 122 of the housing 120 via the connection member 152. The upper frame 130 and the housing 120 can be moved relative to each other in the axial direction (vertical direction) by the expansion and contraction of the elevating cylinder 150.

  The stroke amount of the elevating cylinder 150 is set to the same length as the vertical pitch of the pads of the leg 110. Accordingly, when the lifting cylinder 150 makes one stroke, the carriage main body S is lifted and lowered by 1 pitch in the axial direction (vertical direction).

  As shown in FIG. 12A, the lower frame 140 is formed of a cylindrical member 141 like the upper frame 130, and the lower frame 140 is fixed to the inner wall surface of the housing 120 via a connecting member (not shown). . As a result, the lower frame 140 cannot be moved relative to the housing 120.

  The second engaging means 143 is included in the lower frame 140 in the same manner as the first engaging means 133. The second engaging means 143 has a cylindrical portion 144 having a smaller diameter than the lower frame 140 and a plurality of engaging portions 145... 145 protruding inward from the inner peripheral wall of the upper portion of the cylindrical portion 144. is doing. The second engaging means 143 is attached to the leg 110 so as to be relatively movable in the circumferential direction.

  In the non-engagement state shown in FIG. 12A, the plurality of engaging portions 145... 145 are provided at positions that do not overlap with the plurality of pads 112... 112 of the leg 110 in plan view (as viewed in the axial direction). Yes. The second engaging means 143 is attached to the leg 110 so as to be relatively movable in the vertical direction (axial direction) and the circumferential direction.

  The arm portion 146 is joined to the outer peripheral wall of the cylindrical portion 144 of the second engagement means 143 in the same manner as the first engagement means 133. The arm portion 146 passes through an opening 141 a provided in the cylindrical member 141 of the lower frame 140 and extends to a radial position between the inner peripheral wall of the housing 120 and the outer peripheral wall of the lower frame 140.

  One end of a locking cylinder 147 is connected to the radially outer end of the arm 146, and the other end of the locking cylinder 147 is connected to the lower frame 140 via a connecting member 141b. Yes. The arm portion 146 moves along the opening 141 a of the lower frame 140 by the expansion and contraction of the locking cylinder 147. As a result, the second engaging means 143 connected to the arm portion 146 can move in the circumferential direction with respect to the leg 110.

  Due to the expansion and contraction of the locking cylinder 147, the engaging portions 145... 145 of the second engaging means 143 and the plurality of pads 112... 112 of the legs 110 are similar to the first engaging means 133 in FIG. A non-overlapping state (non-engaged state) shown in FIG. 12B and an overlapping state (engaged state) in a plan view (axial direction) shown in FIG. 12B can be selected.

  As shown in FIG. 11, each engaging portion 145 of the second engaging means 143 can be engaged with each pad 112 of the leg 110 from above as seen from the radial direction (side view) of the leg 110. Has been.

  Here, the raising / lowering operation | movement of the raising / lowering type work platform ship comprised as mentioned above is demonstrated using FIGS. 11-14.

  FIG. 11 shows the state at the time when the lifting device 100 starts to be lifted and lowered as step 1. In step 1, the upper and lower cylinders 150 are arranged at the lowermost position with respect to the housing 120 (slightly above the lower frame 140) by setting the elevating cylinder 150 to the stroke end.

  At this time, the engaging portions 135 and 145 of the first and second engaging means 133 and 143 of the upper frame 130 and the lower frame 140 are in the vertical direction in plan view with respect to the pads 112 of the leg 110. The state is overlapped (see FIG. 12B).

  Each engagement portion 135 of the first engagement means 133 is landed on each pad 112 of the leg 110 as shown by an arrow a in FIG. 11, and each engagement portion 145 of the second engagement means 143 is As shown by the arrow b in FIG. 11, it is slightly lifted from each pad 112 of the leg 110. Accordingly, since the carriage main body S (housing) is supported by the leg 110 via the first engagement means 133, the load of the carriage main body S is applied to the first engagement means 133. .

  FIG. 13A shows a load transfer process for transferring the load acting on the first engagement means 133 to the second engagement means 143 as Step 2. In step 2, as shown by the white arrow in FIG. 13A, the lifting cylinder 150 is slightly shortened so that the housing 120 descends relative to the leg 110 (the load of the carriage main body S is reduced). Since the first engaging means 133 is in a state of acting, the housing 120 is relatively lowered).

  At this time, since the lower frame 140 is fixed to the housing 120, the lower frame 140 is also lowered with respect to the leg 110, and the second engaging means as shown by an arrow a in FIG. 143 is in a state of landing on the pad 112 of the leg 110. Thereby, the load of the carrier body S is transferred from the first engagement means 133 to the second engagement means 143.

  Thereafter, when the elevating cylinder 150 is further contracted, the operation of the lower frame 140 is restricted by the second engaging means 143 and the pad 112 of the leg 110, and therefore the upper frame 130 is raised. As the upper frame 130 is raised, the first engaging means 133 is lifted from the engaged portion 112 of the leg 110 as shown by the arrow b in FIG. In the operation of step 2, the load of the main body S is transferred from the upper frame 130 side to the lower frame 140 side, and the load of the main body S is applied to the second engaging means 143.

  In the load transfer process in Step 2, each engagement portion 135 of the first engagement means 133 is lifted from each pad 112 of the leg 110, and each engagement portion 145 of the second engagement means 143 is It is visually confirmed by the operator that the pad 110 of the leg 110 has landed.

  FIG. 13B shows a step for allowing the upper frame 130 to move relative to the legs 110 in the axial direction (vertical direction) as step 3 and a step for raising the upper frame 130 as step 4. Yes.

  Step 3 is a process for enabling the upper frame 130 to move relative to the leg 110 in the axial direction (vertical direction). As shown by the arrow in FIG. 13B, the first engaging means 133 and the plurality of pads 112... 112 of the leg 110 are seen in a plan view by rotating the first engaging means 133 in the circumferential direction. So that they do not overlap (see FIG. 12A).

  In Step 4, the upper frame 130 is raised relative to the leg 110 by the lifting cylinder 150 being shortened to the reduction end. At this time, the carriage main body S maintains the state supported by the leg 110 by the second engagement means 143.

  FIG. 14A shows that, as step 5, each engagement portion 135 of the first engagement means 133 can be engaged with each pad 112 of the leg 110 in order to maintain the upper frame 130 in the raised state. A step of changing the load to the first engagement means 133 is shown as step 6 and a load transfer process of transferring the load acting on the second engagement means 143 to the first engagement means 133 as step 6.

  In step 5, as indicated by the arrows, the first engaging means 133 is rotated in the circumferential direction, so that the respective engaging portions 135 of the first engaging means 133 and the respective pads 112 of the leg 110 are seen in a plan view. (See FIG. 12B).

  In step 6, when the lift cylinder 150 is slightly extended as indicated by the white arrow in FIG. 14A, the load of the carriage main body S is applied to the second engagement means 143. Does not move relative to the leg 110, the upper frame 130 and the first engagement means 133 are lowered relative to the leg 110. As a result, each engaging portion 135 of the first engaging means 133 lands on each pad 112 of the leg 110 (see arrow a in FIG. 14A).

  Thereafter, when the elevating cylinder 150 is further extended, the lowering operation of the upper frame 130 is regulated by the respective engaging portions 135 of the first engaging means 133 and the respective pads 112 of the leg 110. Frame 140 rises relative to leg 110. As the lower frame 140 is raised, the engagement portions 145 of the second engagement means 143 are slightly lifted from the pads 112 of the leg 110 (see arrow b in FIG. 14A). As a result, the load of the main body S is moved from the lower frame 140 to the upper frame 130.

  At this time, in the load transfer process of the main body S, the engagement portions 135 of the first engagement means 133 are landed on the pads 112 of the leg 110 and the second engagement means 143 The fact that each engaging portion 145 is lifted from each pad 112 of leg 110 is completed by visual confirmation by an operator.

  FIG. 14B shows a step for making the lower frame 140 relatively movable in the axial direction (vertical direction) with respect to the leg 110 as step 7 and a step for raising the carriage main body S as step 8. It shows.

  In step 7, as indicated by the arrows, the second engaging means 143 is rotated in the circumferential direction, so that the engaging portions 145 of the second engaging means 143 and the pads 112 of the legs 110 become flat. It will be in the state which does not overlap visually (refer FIG. 12B). As a result, the lower frame 140 and the housing 120 fixed to the lower frame 140 and the carriage main body S can move relative to the leg 110 in the axial direction.

  In step 8, the elevating cylinder 150 is extended to the stroke end, so that the housing 120 and the carrier body S are raised relative to the leg 110 with reference to the first engagement means 133. At this time, the lower frame 140 connected to the housing 120 so as not to move relatively is also raised relative to the leg 110 at the same time.

As described above, in the conventional lifting device, when Step 1 to Step 8 are one cycle, the carriage main body S moves up and down by one stroke every cycle. The carrier main body S can be raised and lowered to a desired position by repeating Step 1 to Step 8.
In the lift-type work platform ship operated in this way, during step 1 to step 7 in one cycle, the stand main body S does not rise.

  By the way, as mentioned above, the lifting device is usually provided at each of the four corners of the carriage so as to raise and lower the carriage (see FIG. 10). For this reason, for example, when one of a plurality of lifting devices is performing a lifting operation and another lifting device is in a standby state, the carriage main body S itself may be inclined. On the other hand, the tilting of the main body S is suppressed by temporarily stopping the lifting operation of one lifting device during the lifting operation and setting it in a standby state. However, temporarily stopping the ascent operation slows the rise of the carriage main body, and it takes a considerable time to raise the carriage main body.

  In particular, as in the prior art, a lifting device using a hydraulic cylinder raises and lowers the main body by extension of the hydraulic cylinder, and then waits to shorten the extended hydraulic cylinder in order to extend the hydraulic cylinder. There is a step (Step 4).

  Therefore, in the present invention, in the lift work table ship, the efficiency of the lift work of the carriage main body is improved by reducing the standby step for shortening the extended hydraulic cylinder at the time of raising and lowering the main ship body ( The task is to shorten the work process).

First, the device according to claim 1 includes a plurality of legs fixed by landing on the seabed, a base ship body that can be moved up and down along the plurality of legs, and a lifting device that lifts and lowers the base ship body. And the plurality of legs have a plurality of engaged portions that extend in the vertical direction and are intermittently arranged in the vertical direction. Each of the plurality of legs can be inserted, and the housing is fixed to the main body of the boat. And a second frame provided with a second engaging means that is accommodated so as to be movable in the axial direction with respect to the housing and that can be engaged with and disengaged from the engaged portion. And the first frame axially relative to the housing Comprises a first cylinder for relative movement, and a second cylinder for relative movement in the axial direction with respect to the second frame the housing,
The maximum stroke amount of the first cylinder and the second cylinder is equal to one pitch in the vertical direction of the plurality of engaged portions.

  The invention described in claim 2 is the invention described in claim 1, wherein when the first cylinder is shortened, the second engaging means is engaged with the leg and the first is engaged. When the second cylinder is extended and the second cylinder is shortened, the first engagement means is engaged with the leg and the first cylinder is extended, whereby the main body of the carriage Is configured to be raised and lowered.

  Further, the invention described in claim 3 is the invention described in claim 1 or claim 2, wherein the first and second engaging means receive a load during engagement and remove the load. Thus, it is configured to be disengageable.

  Further, the invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the second frame includes the housing and the second frame in the axial direction. A third cylinder for relative movement is further provided.

  Further, the invention described in claim 5 is the invention described in claim 4, wherein the stroke amount of the third cylinder is the load of the carriage main body among the first and second engaging means. And having a stroke amount capable of transferring a load from one engaging means to the other engaging means, and set shorter than the stroke amounts of the first and second cylinders. To do.

  It should be noted that the stroke amount to which the load can be transferred is that one of the first engaging means and the second engaging means is one engaging means to which the load of the carrier body is not applied acts on the engaged portion. It means a stroke amount that is in a landed state and in which the other engaging means on which the load of the carriage is acting floats from the engaged portion.

  Further, the invention described in claim 6 is the invention described in claim 4 or claim 5, wherein the second cylinder and the third cylinder are both rods in which a cylinder body is unified. It is a formula.

  Further, the invention described in claim 7 is the invention described in any one of claims 4 to 6, wherein the third cylinder has a load that detects a load transfer state. A transfer sensor is attached.

  According to the first aspect of the present invention, the first frame and the second frame can be moved in the axial direction with respect to the housing, and include a first cylinder and a second cylinder respectively connected to the housing. Therefore, the first frame and the second frame can be moved up and down relative to the leg in an independent state.

  Thereby, when raising and lowering the main body of the carrier by the extension operation of the one side cylinder, in parallel with this, the cylinder on the other side can perform a shortening operation to prepare for the raising and lowering of the main body. Thereafter, at the time of the shortening operation after the extending operation of the one side cylinder, the main body can be moved up and down relatively with respect to the leg by extending the other side cylinder. As a result, it is possible to reduce the standby step for performing only the shortening operation of the cylinder for preparing the raising and lowering of the main body of the carriage.

  Specifically, as in the prior art, an elevating device using a hydraulic cylinder raises and lowers the carrier body relative to the leg by extension of the hydraulic cylinder, and then extends the hydraulic cylinder. A standby step (step 4) for shortening the extended hydraulic cylinder is required. On the other hand, in the present invention, by extending the second cylinder in parallel with the shortening of the first cylinder, the housing and the carrier main body are moved up and down relative to the leg with respect to the second frame. Can be made. Therefore, since the raising / lowering step can be performed in parallel in the conventional waiting step, the step of performing only the waiting step during the raising / lowering operation can be reduced.

  In addition, since the stroke amounts of the first cylinder and the second cylinder coincide with one pitch in the vertical direction of the plurality of engaged portions, the stroke is caused by one stroke of the first cylinder or the second cylinder. The ship body can be raised and lowered by 1 pitch relative to the leg.

  According to the second aspect of the invention, when one cylinder is in the standby step, the main body can be moved up and down by the other cylinder, so that the standby step can be reduced.

  Specifically, the second engagement means is engaged with the leg during a standby step for preparation for the next raising / lowering that shortens the first cylinder while the first engagement means is free. The carrier main body can be supported and the second cylinder can be extended to raise and lower the carrier main body relative to the leg. On the other hand, in the standby step for preparing for the next raising / lowering to shorten the second cylinder while the second engagement means is free, the first engagement means is engaged with the leg and the main body And the first cylinder can be extended to raise and lower the carrier body relative to the leg.

  According to the third aspect of the invention, the first and second engaging means are configured to receive a load at the time of engagement and to be disengaged by removing the load. When one of the engaging means is in an engaged state where it receives a load and the other is in a disengageable state where it does not receive a load, the one engaging means is disengaged by applying a load to the other engaging means. It can be made possible. As a result, the load is transferred from one engagement means to the other engagement means.

  According to the fourth aspect of the present invention, the stroke amount of the third cylinder is the stroke amount for transferring the load (the first engagement means and the second engagement means of the carriage main body. The amount of stroke at which one engaging means that is not applied with a load has landed on the engaged part, and the other engaging means that is applied with the load on the main body of the carrier is floating from the engaged part. ), As in Step 2 and Step 6 of the prior art, the lift cylinder is in an unstable state such as an intermediate stroke (a slightly expanded or contracted state) for load transfer. The trolley body can be moved up and down relatively with respect to the leg without being held at the position.

  Therefore, the visual confirmation by the operator in the load transfer process (step 2 and step 6) can be omitted, so that it is not necessary for the operator to operate the hydraulic cylinder, and the load is detected at the end point of the stroke. The transfer can be completed.

  As a result, for example, even when a plurality of engaging means and engaged portions are provided in the circumferential direction, the main body of the carriage can be raised and lowered without the operator visually checking all the engagement states. The work process and the waiting time in the work process when raising and lowering the main body can be shortened.

  Further, since the stroke amount of the first cylinder matches one pitch in the vertical direction of the plurality of engaged portions, the main body of the carriage is raised and lowered by one pitch with respect to the leg by one stroke of the first cylinder. Can be made.

  According to the invention described in claim 5, the stroke amount of the third cylinder for concretely implementing the invention described in claim 4 is shown. Thereby, the idea of Claim 4 can be performed effectively.

  According to the sixth aspect of the present invention, the second cylinder and the third cylinder are arranged in a limited space in the housing as compared to the case where the second cylinder and the third cylinder are arranged in the housing with different circumferential directions. Layout efficiency can be increased. For example, four first cylinders and four second cylinders are provided, and the third cylinders are arranged at positions that are different from each other in the circumferential direction and do not interfere with the first and second cylinders. Compared to the case, it is easy to secure a space for arranging the third cylinder.

  According to the seventh aspect of the present invention, the load transfer sensor for detecting the load transfer state is attached to the third cylinder. The completion of the load transfer can be determined when the hydraulic pressure of the third cylinder reaches a predetermined value. Thereby, raising / lowering of a main body of a ship can be performed by automatic operation.

Sectional drawing which shows the whole raising / lowering apparatus of the raising / lowering type work platform ship which concerns on this invention. 1. Y1-Y1 sectional drawing in FIG. 1 which shows the relationship between the 1st flame | frame in a non-engagement state, a 1st engagement means, and a leg. 1. The Y1-Y1 cross-sectional enlarged view in FIG. 1 which shows the relationship between the 1st flame | frame in the engagement state, a 1st engagement means, and a leg. 1. Y2-Y2 sectional drawing in FIG. 1 which shows the relationship between the 2nd flame | frame in a non-engagement state, a 2nd engagement means, and a leg. In step 1, when the load of the carrier body is applied to the first engaging means, the engaging portions of the first and second engaging means, the pads of the legs, and the load transfer cylinder The elements on larger scale of FIG. 1 which show a state. (A) a sectional view showing the entire lifting device when the load of the carrier body is transferred from the first engaging means to the second engaging means in Step 2, and (b) the first and second FIG. 6 is a partially enlarged view in FIG. 5A showing the state of each engaging portion of the engaging means, each pad of the leg, and the load transfer cylinder. (A) a sectional view showing the entire lifting device when the first engaging means is disengaged in step 3, and (b) each engaging portion and leg of the first and second engaging means. The elements on larger scale in Drawing 6 (a) showing each pad and a cylinder for load transfer. (A) a sectional view showing the entire lifting device when the base boat is lifted by extension of the lower lifting cylinder in step 4; and (b) each engaging portion and leg of the first and second engaging means. FIG. 7A is a partially enlarged view of FIG. 7A showing the state of each pad and the load transfer cylinder. (A) A sectional view showing the entire lifting device when the second engagement means is engaged in step 5, and (b) a step from the second engagement means to the first engagement means in step 6. Sectional drawing which shows the whole raising / lowering apparatus when the load of a ship main body is transferred. (A) A cross-sectional view showing the entire lifting device when the second engaging means is disengaged in step 7, and (b) when the carriage rises due to the extension of the upper lifting cylinder in step 8. Sectional drawing which shows the whole raising / lowering apparatus. Explanatory drawing which showed the state which the raising / lowering type work platform ship floated on the sea surface. Sectional drawing which shows the whole raising / lowering apparatus of the conventional raising / lowering type work platform ship. XX sectional drawing in FIG. 11 which shows the relationship between the 1st flame | frame in a non-engagement state, a 1st engagement means, and a leg. XX sectional drawing in FIG. 11 which shows the relationship between the 1st flame | frame in the engagement state, a 1st engagement means, and a leg. (A) A partially enlarged view of the lifting device when the load is transferred from the first engagement means to the second engagement means in step 2 and the first engagement means is disengaged in step 3; (B) The partial enlarged view of the raising / lowering apparatus when the cylinder for raising / lowering is shortened by step 4, and the 1st engaging means is engaged by step 5. FIG. (A) Partial enlargement of the lifting device when the load is transferred from the second engagement means to the first engagement means in step 6 and the engagement of the second engagement means is released in step 7 The figure and (b) The elements on larger scale of the raising / lowering apparatus when a base boat raises by extension of the raising / lowering cylinder in step 8. FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In addition, the following description is only an illustration essentially and does not intend restrict | limiting this invention, its application thing, or its use. Further, the drawings are schematic, and the ratio of each dimension is different from the actual one.

  As shown in FIG. 10, the elevating work platform P in the present embodiment has a plurality of legs 10 attached to the bottom of the sea so that the position corresponds to the work position of the ocean. The carriage main body S is configured to be raised and lowered by the lifting device 1 along the leg 10 which is erected and fixed. The lifting devices 1... 1 are installed at the four corners of the main body S, respectively.

  FIG. 1 is a cross-sectional view showing a configuration of an elevating device 1 of an elevating work platform ship P according to an embodiment of the present invention. As shown in FIG. 1, the lifting device 1 has a housing 20 through which a leg 10 having a plurality of pads 12... The first frame 30 including the first engagement means 33 that is accommodated so as to be relatively movable in the vertical direction (the axial direction of the leg 10) and that can be engaged with and disengaged from the plurality of pads 12. A second frame 40 having a second engaging means 43 that is accommodated so as to be relatively movable in the vertical direction (the axial direction of the leg 10) and that can be engaged with and disengaged from the plurality of pads 12 ... 12; 30 and a lower cylinder as a second cylinder enabling the relative movement of the second frame 40 and the housing 20. A load transfer exchange cylinder 60, 70 as Linda and third cylinders are provided.

  As shown in FIGS. 1 and 2, the leg 10 includes a cylindrical portion 11 extending vertically and a plurality of pads 12... 12 protruding outward from the outer peripheral wall of the cylindrical portion 11. . The plurality of pads 12 ... 12 are arranged at an equal pitch L in the vertical direction. The plurality of pads 12... 12 are arranged at equal intervals along the outer peripheral wall of the cylindrical portion 11 also in the circumferential direction of the cylindrical portion 11 of the leg 10.

  The housing 20 has a main body portion 21 formed in a cylindrical shape, and an upper end portion of the main body portion 21 is closed by a disk-shaped ceiling portion 22. The ceiling portion 22 is provided with an opening 23 for inserting the leg 10. A cylindrical guide member 24 for guiding the insertion of the leg 10 is fitted into the opening 23 and is joined by welding, for example.

  A disc-shaped flange member 25 having an opening for inserting the leg 10 at the center is joined to the lower end of the main body 21 of the housing 20. The housing 20 is fixed to the upper surface of the carriage main body S via a flange member 25.

  The inner peripheral surface 21a of the main body 21 is connected to the inner peripheral surface 21a, the lower surface 22a of the ceiling portion 22, the outer peripheral surface 24a of the guide member 24, and the upper surface 25a of the flange member 25, and extends in the vertical direction. A plurality of ribs 26 ... 26 are provided.

  The plurality of ribs 26 are arranged so as to sandwich an upper lifting cylinder 50 and a lower lifting cylinder 60, which will be described later, by a pair of ribs 26, 26 arranged in the circumferential direction.

  The first frame 30 includes a cylindrical portion 31 through which the leg 10 passes, and a plurality of protruding portions 32... 32 protruding inward from the inner peripheral walls of the upper end portion and the lower end portion of the cylindrical portion 31. Yes. The plurality of projecting portions 32... 32 and the plurality of pads 12... 12 of the leg 10 are positions that do not overlap in plan view (viewed in the axial direction) when the leg 10 is inserted through the first frame 30. (See FIG. 2).

  A first engaging means 33 is included on the inner peripheral side of the cylindrical portion 31 of the first frame 30. The cylindrical portion 31 of the first frame 30 is provided with an opening 31 a for allowing the arm portion 36 connected to the first engaging means 33 to penetrate to the outer peripheral side of the first frame 30.

  The first engaging means 33 includes a cylindrical portion 34 having a smaller diameter than the cylindrical portion 31 of the first frame 30, and a plurality of engaging portions 35 projecting inward from the inner peripheral wall of the upper portion of the cylindrical portion 34. 35.

  The plurality of engaging portions 35... 35 are provided at circumferential positions corresponding to the plurality of projecting portions 32... 32 of the first frame 30 in a non-engaged state described later (see FIG. 2A). The first engagement means 33 is attached to the leg 10 and the housing 20 so as to be relatively movable in the vertical direction (axial direction) and the circumferential direction.

  An arm portion 36 is joined to the outer peripheral wall of the cylindrical portion 34 of the first engaging means 33. The arm portion 36 passes through an opening 31 a provided in the cylindrical portion 31 of the first frame 30 and extends to a radial position between the inner peripheral wall of the housing 20 and the outer peripheral wall of the first frame 30.

  One end of a locking cylinder 37 is connected to the radially outer end of the arm 36. The other end of the locking cylinder 37 is connected to the first frame 30 via a connecting member 38 attached to a flange 51 that supports the lower end of the upper elevating cylinder 50. The arm portion 36 moves along the opening 31 a of the first frame 30 by expansion and contraction of the locking cylinder 37. Accordingly, the first engaging means 33 connected to the arm portion 36 can move in the circumferential direction with respect to the leg 10.

  The engagement portions 35... 35 of the first engagement means 33 and the plurality of pads 12... 12 of the leg 10 do not overlap as shown in FIG. State) and an overlapping state (engageable state) in a plan view (as viewed in the axial direction) shown in FIG. 2B can be selected.

  As shown in FIG. 1, each engagement portion 35 of the first engagement means 33 is relative to each engaged portion (pad) 12 of the leg 10 when viewed from the radial direction (side view) of the leg 10. It can be engaged from above. Thus, the first engagement means 33 is configured to be engaged by receiving a load when in the engageable state, and to be disengaged by removing the load.

  The first frame 30 is connected to the housing 20 via a plurality of upper elevating cylinders 50. Each upper elevating cylinder 50 is driven by hydraulic oil discharged from a hydraulic pump (not shown) as a hydraulic pressure generation source, and moves the first frame 30 in the vertical direction with respect to the housing 20 (the axial direction of the leg 10). It is a hydraulic cylinder that is moved relative to (moved up and down). The first frame 30 and the housing 20 can move relative to each other in the axial direction (vertical direction) by the expansion and contraction of the upper elevating cylinder 50.

  Specifically, four upper lifting cylinders 50 are provided at equal intervals along the outer peripheral wall of the first frame 30. The upper end of each upper elevating cylinder 50 is connected to the housing 20, and the lower end is connected to the first frame 30. The upper end portion of each upper elevating cylinder 50 is inserted into an opening 27 for inserting the upper elevating cylinder 50 provided in the ceiling portion 22 of the housing 20, and a flange provided on the upper surface side of the ceiling portion 22. It is connected to the housing 20 via a member 52. The lower end portion of each upper elevating cylinder 50 is connected to the first frame 30 via, for example, a flange portion 51 joined to the outer peripheral wall of the first frame 30.

  The first engaging means 33 is included in the first frame 30, and the cylindrical portion 34 of the first engaging means 33 overlaps the protruding portions 32... 32 in plan view. When the first frame 30 moves in the axial direction, the first frame 30 can move in the axial direction with respect to the housing 20 following the operation of the first frame 30.

  The maximum stroke amount of each upper elevating cylinder 50 is set to coincide with one pitch L of the plurality of pads 12... 12 of the leg 10. Therefore, by making each upper elevating cylinder 50 one stroke, One frame 30 can be moved up and down by one pitch relative to the leg 10.

  As shown in FIG. 3, like the first frame 30, the second frame 40 protrudes inward from the cylindrical portion 41 through which the leg 10 passes and the inner peripheral walls of the upper end portion and the lower end portion of the cylindrical portion 41. A plurality of projecting portions 42... 42. The plurality of projecting portions 42... 42 and the plurality of pads 12... 12 of the leg 110 are provided at positions that do not overlap in plan view (axial direction) when the leg 10 is inserted through the second frame 40. ing.

  On the inner peripheral side of the cylindrical portion 41 of the second frame 40, second engagement means 43 is included. The cylindrical portion 41 of the second frame 40 is provided with an opening 41 a for allowing the arm portion 46 connected to the second engaging means 43 to penetrate to the outer peripheral side of the second frame 40.

  The second engaging means 43 has a cylindrical portion 44 and a plurality of engaging portions 45... 45 provided at circumferential positions corresponding to the plurality of projecting portions 42... 42 of the second frame 40. Yes. The second engaging means 43 is attached to the leg 10 and the housing 20 so as to be relatively movable in the vertical direction (axial direction) and the circumferential direction.

  Similarly to the first engagement means 33, an arm part 46 is joined to the outer peripheral wall of the cylindrical portion 44 of the second engagement means 43. The arm portion 46 extends through the opening 41 a provided in the cylindrical portion 41 of the second frame 40 to a radial position between the inner peripheral wall of the housing 20 and the outer peripheral wall of the second frame 40.

  One end of the locking cylinder 47 is connected to the radially outer end of the arm 46, and the other end of the locking cylinder 47 is connected to the second frame 40 via a connecting member 41b. Yes. The arm portion 46 moves along the opening 41 a of the second frame 40 by the expansion and contraction of the locking cylinder 47. As a result, the second engagement means 43 connected to the arm portion 46 is movable in the circumferential direction with respect to the leg 10.

  The engagement portions 45... 45 of the second engagement means 43 and the plurality of pads 12... 12 of the leg 10 are shown in FIG. A non-overlapping state (non-engaged state) shown in FIG. 2B and an overlapping state (engaged state) in a plan view (axial direction) shown in FIG. 2B can be selected.

  As shown in FIG. 1, each engagement portion 45 of the second engagement means 43 is relative to each engaged portion (pad) 12 of the leg 10 when viewed from the radial direction (side view) of the leg 10. It can be engaged from above. As a result, like the first engaging means 33, the second engaging means 43 is engaged by receiving a load when in the engageable state, and can be disengaged by removing the load. It is configured to be.

  In addition to the above configuration, the lifting device 1 of the present invention further includes a plurality of lower lifting cylinders 60... 60 and a plurality of load transfer cylinders that allow the second frame 40 and the housing 20 to move relative to each other. 70... 70 are provided.

  Each lower lift cylinder 60 and each load transfer cylinder 70 are driven by hydraulic fluid discharged from a hydraulic pump (not shown) as a hydraulic source, similarly to the upper lift cylinder 50, and the second frame. The hydraulic cylinder 40 is moved relative to the housing 20 in the vertical direction (the axial direction of the leg 10).

  A plurality of lower lifting cylinders 60 ... 60 are provided at equal intervals along the outer peripheral wall of the second frame 40, and at different positions (for example, 45 degrees from the upper lifting cylinder 50). (Position). The upper end portion of each lower elevating cylinder 60 is connected to the housing 20 via each load transfer cylinder 70, and the lower end portion of each lower elevating cylinder 60 is a flange portion joined to the second frame 40. It is connected to the outer peripheral wall of the second frame 40 via 61.

  The expansion and contraction of each lower lifting cylinder 60 and each load transfer cylinder 70 is configured such that the second frame 40 can be moved relative to the housing 20 in the vertical direction (the axial direction of the leg 10). Yes.

  The stroke amount of each lower lift cylinder 60 is set to coincide with the stroke amount of each upper lift cylinder 50 and one pitch L of the plurality of pads 12... 12 of the leg 10. By making the cylinder 60 make one stroke, the second frame 40 can be raised and lowered relative to the leg 10 by one pitch.

  The plurality of load transfer cylinders 70... 70 are provided at equal intervals along the outer peripheral wall of the second frame 40 as well as the lower elevating cylinder 60. They are arranged at different positions in the direction (for example, positions shifted by 45 degrees).

  The upper end portion of each load transfer cylinder 70 is connected to the housing 20 via, for example, a pair of ribs 26, 26, and the lower end portion of each load transfer cylinder 70 is connected to each lower lift cylinder 60. Connected to the second frame 40.

  The stroke amount of each load transfer cylinder 70 is set shorter than the stroke amounts of the upper elevating cylinder 50 and the lower elevating cylinder 60. Specifically, the stroke amount for transferring the load between the first engagement means 33 and the second engagement means 43 (for example, each engagement portion 35 of the first engagement means 33 is legged). 10) and a stroke amount for landing each engagement portion 45 of the second engagement means 43 on each pad 12 of the leg 10. is doing.

  In the present embodiment, the lower lifting cylinders 60 and the load transfer cylinders 70 are arranged at overlapping positions in plan view, and the upper ends of the lower lifting cylinders 60 and A double rod type hydraulic cylinder in which the lower end of the load transfer cylinder 70 is integrally formed is used.

  In addition, a hydraulic pressure sensor 80 that detects the hydraulic pressure of the load transfer cylinder 70 is attached to the load transfer cylinder 70 as a load transfer sensor that detects the state of load transfer. Thereby, since the stroke amount of the load transfer cylinder 70 can be detected, the completion of the load transfer can be determined by detecting the hydraulic pressure at the stroke end of the load transfer cylinder 70.

  Here, the raising / lowering operation | movement of the raising / lowering type work platform ship P comprised in this way is demonstrated using FIGS.

  FIG. 1 and FIG. 4 show the state at the time when the lifting / lowering device 1 starts to be lifted as Step 1, where the upper lifting / lowering cylinder 50 is extended to the stroke end, and the lower lifting / lowering cylinder 60 and The load transfer cylinder 70 is shortened. As a result, the first frame 30 and the second frame are arranged in the closest state near the center of the housing 20.

  At this time, the engaging portions 35 and 45 of the first and second engaging means 33 and 43 of the first frame 30 and the second frame 40 are in the vertical direction in plan view with respect to the pads 12 of the leg 10. (See FIG. 2B).

  Each engagement portion 35 of the first engagement means 33 lands on each pad 12 of the leg 10 as indicated by an arrow a in FIG. 4, and each engagement portion 45 of the second engagement means 43 is As shown by the arrow b in FIG. 4, it is slightly lifted from each pad 12 of the leg 10. Therefore, since the carrier main body S (housing 20) is supported by the leg 10 via the first engagement means 33, the load of the carrier main body S acts on the first engagement means 33. Become.

  FIGS. 5A and 5B show a load transfer process for moving the load acting on the first engagement means 33 to the second engagement means 43 as step 2. In step 2, the load transfer cylinder 70 is extended to the stroke end, so that the housing 20 is lowered relative to the leg 10 (the load of the carriage main body S is the first engaging means). 33, the housing 20 is relatively lowered.

  At this time, since the second frame 40 is fixed to the housing 20, the second frame 40 is also lowered with respect to the leg 10, and the second engaging means as shown by the arrow a in FIG. The 43 engaging portions 45 land on the pads 12 of the leg 10. Thereby, the load of the main body S is transferred from the first engagement means 33 to the second engagement means 43.

  Further, since the operation of the second frame 40 is regulated by the respective engaging portions 45 of the second engaging means 43 and the respective pads 12 of the leg 10, the first frame 30 is raised. As the first frame 30 is raised, the respective engagement portions 35 of the first engagement means 33 are lifted from the respective pads 12 of the leg 10 as indicated by arrows b in FIG. In the operation of step 2, the load of the carriage is moved from the first frame 30 to the second frame 40, and the load of the carriage main body S is applied to the second engagement means 43.

  The transfer of the load on the main body S is performed by detecting that the hydraulic pressure of the load transfer cylinder 70 has reached a predetermined value by the hydraulic sensor 80 or the like. It is determined that the portion 35 has floated from each pad 12 of the leg 10 and that each engaging portion 45 of the second engaging means 43 has landed on each pad 12 of the leg 10. Thereby, the confirmation work of the load transfer by visual confirmation like the conventional can be reduced. In addition, for example, if the control device determines that the load transfer step is completed, the operation can be advanced to step 3 so that the carriage main body can be automatically moved up and down.

  FIGS. 6A and 6B show a step for making the first frame 30 relatively movable in the axial direction (vertical direction) with respect to the leg 10 as step 3. In step 3, as indicated by the arrows, the first engaging means 33 is rotated in the circumferential direction, so that each engaging portion 35 of the first engaging means 33 and each pad 12 of the leg 10 are flat. It will be in the state which does not overlap visually (refer FIG. 2A).

  FIGS. 7A and 7B show a step of raising the main body S (housing 20) and raising the first frame 30 as step 4. In step 4, the base body S (housing 20) is raised relative to the leg 10 with respect to the second engagement means 43 by extending the lower lifting cylinder 60 to the stroke end. At this time, the first elevating cylinder 50 is shortened to the contraction end, so that the first frame 30 rises relative to the leg 10.

  Therefore, the carriage main body S can be raised by one stroke between Step 1 and Step 4, and the standby step is reduced from the conventional 7 steps to only 3 steps from Step 1 to Step 3.

  After that, when the carriage main body S is further raised, Step 8 which is the initial state of Step 5 to Step 1 which is different from the above-described Step 1 is executed. Steps 5 to 8 will be specifically described with reference to FIGS. 8 and 10.

  FIG. 8A shows a step 5 in which each engaging portion 35 of the first engaging means 33 can be engaged with each pad 12 of the leg 10 in order to prepare for the lifting by the upper lifting cylinder 50. The process which makes it a state is shown. In step 5, as shown by the arrows, the first engaging means 33 is rotated in the circumferential direction, so that the respective engaging portions 35 of the first engaging means 33 and the respective pads 12 of the leg 10 are viewed in plan view. (See FIG. 2B).

  FIG. 8B shows a process for transferring the load, which moves the load acting on the second engaging means 43 to the first engaging means 33 as step 6. In step 6, the load transfer cylinder 70 is shortened. At this time, since the load of the carriage main body S is applied to the second engaging means 43, the housing 20 does not move relative to the leg 10, and therefore the first frame 30 and the first engaging means 33 are connected to the leg 10. Descends relative to As a result, each engaging portion 35 of the first engaging means 33 lands on each pad 12 of the leg 10 (see arrow a in FIG. 4).

  Further, the lowering operation of the first frame 30 is regulated by the respective engaging portions 35 of the first engaging means 33 and the respective pads 12 of the leg 10, so that the second frame 40 is relative to the leg 10. Rises. As the second frame 40 is raised, the engaging portions 45 of the second engaging means 43 are slightly lifted from the pads 12 of the leg 10 (see arrow b in FIG. 4). As a result, the load on the main body S is transferred from the second engagement means 43 to the first engagement means 33.

  At this time, the transfer of the load of the main body S is detected by the hydraulic sensor 80 or the like that the hydraulic pressure of the load transfer cylinder 70 has reached a predetermined value. It is determined that each engagement portion 35 has landed on each pad 12 of the leg 10 and that each engagement portion 145 of the second engagement means 143 has floated from each pad 112 of the leg 110. Thereby, the confirmation work of the load transfer by visual confirmation like the conventional can be reduced.

  FIG. 9A shows a step for enabling the second frame 40 to move relative to the leg 10 in the axial direction (vertical direction) as step 7. In step 7, as shown by the arrows, the second engaging means 43 is rotated in the circumferential direction, so that each engaging portion 45 of the second engaging means 43 and each pad 12 of the leg 10 are flat. It will be in the state which does not overlap visually (refer FIG. 2A). As a result, the second frame 40 can move relative to the leg 10 in the axial direction.

  FIG. 9B shows a process of raising the main body S as step 8. In step 8, the upper lift cylinder 50 is extended to the stroke end, so that the main body S (housing 20) rises relative to the leg 10 with respect to the first engagement means 33. At this time, the second lifting / lowering cylinder 60 is shortened to the reduction end, so that the second frame 40 is raised relative to the leg 10.

  Accordingly, the carriage main body S can be raised by one stroke between Step 5 and Step 8, and the standby step can be reduced to only 3 steps from Step 5 to Step 7 as in Steps 1 to 4.

  As described above, by repeating Step 1 to Step 8, the carriage main body S can be raised to a desired position. In the lift-type work platform ship operated in this way, the two-stroke carriage main body S can be raised between Step 1 and Step 8, and a standby step for raising the carriage main body S by one stroke is performed. The conventional 7 steps can be reduced to 3 steps.

  In addition, about the descending operation | movement of the main body S, it can descend by the reverse step to the above-mentioned ascending operation.

  As described above, according to the lift type work platform ship of the present invention, the first frame 30, the second frame 40, and the housing 20 can be moved in the axial direction. Since the first cylinder 30 and the second frame 40 are independent of each other, the main body S can be moved up and down relatively with respect to the leg 10.

  Thereby, when raising / lowering the main body S by elongating operation of the cylinder on one side, in parallel with this, the cylinder on the other side may shorten the base body S to prepare for raising / lowering. it can. Thereafter, during the shortening operation after the extending operation of the one side cylinder, the main body S can be moved up and down relatively with respect to the leg by extending the other side cylinder. As a result, it is possible to reduce the standby step for performing only the shortening operation of the cylinder for preparing the lift main body S to be lifted.

  Specifically, as in the prior art, the lifting device 100 using a hydraulic cylinder raises and lowers the main body S relative to the leg 110 by the extension of the hydraulic cylinder. Therefore, a standby step (step 4) for shortening the extended hydraulic cylinder is required. On the other hand, in the present invention, the lower lifting cylinder 60 is extended in parallel with the shortening of the upper lifting cylinder 50, so that the housing 20 and the carrier body S are connected to the leg 10 with respect to the second frame 40. Can be moved up and down relatively. Therefore, since the raising / lowering step can be performed in parallel in the conventional waiting step, the step of performing only the waiting step during the raising / lowering operation can be reduced.

  Further, since the stroke amounts of the upper elevating cylinder 50 and the lower elevating cylinder 60 coincide with one pitch L in the vertical direction of the plurality of pads 12... 12, the upper elevating cylinder 50 or the lower elevating cylinder. With one stroke of 60, the carriage main body S can be raised and lowered by one pitch relative to the leg 10.

  In addition, when one cylinder is in the standby step, the carriage main body can be moved up and down by the other cylinder, so the standby step can be reduced.

  When the first engagement means 33 is in a free state, the second engagement means 43 is engaged with the leg 10 during the standby step for preparing the next raising / lowering to shorten the upper raising / lowering cylinder 50. While supporting the ship main body S, the lower lift cylinder 60 can be extended to raise and lower the base ship main body S relative to the leg 10. On the other hand, in the standby step for preparing for the next raising / lowering for shortening the lower raising / lowering cylinder 60 with the second engaging means 43 in a free state, the engaging portions 35 of the first engaging means 33 are It is possible to engage with each pad 12 of the leg 10 to support the carrier main body S and extend the upper lift cylinder 50 to raise and lower the carrier main body S relative to the leg 10.

  Further, the first and second engaging means 33 and 43 are configured to receive a load at the time of engagement and to be disengaged by removing the load, so that one of the engaging means receives the load. In the engaged state, when the other is in a disengageable state where no load is applied, by applying a load to the other engaging means, one of the engaging means can be brought into a disengageable state. Thereby, the load can be transferred from one engagement means to the other engagement means.

The maximum stroke amount of the load transfer cylinder 70 is the stroke amount for load transfer (the load of the carriage main body S is acting on the first engagement means 33 and the second engagement means 43). The amount of stroke in which the other engaging means that is not in contact with the engaged portion is lifted from the engaged portion). Therefore, as in Step 2 and Step 6 of the prior art, the lifting cylinder is held in an unstable state (slightly expanded and contracted) like an intermediate stroke for load transfer. The base body S can be moved up and down relatively with respect to the leg 10.

  Therefore, the visual confirmation by the operator in the load transfer process (step 2 and step 6) can be omitted, so that it is not necessary for the operator to operate the hydraulic cylinder, and the load is detected at the end point of the stroke. The transfer can be completed.

  As a result, for example, even when the engagement portions 35 and 45 and the pads 12 of the plurality of engagement means are provided in the circumferential direction, the main body of the carriage is not visually confirmed by the operator. Since S can be moved up and down, the work process and the waiting time in the work process when the main body S is lifted can be shortened.

  Since the lower lifting cylinder 60 and the load transfer cylinder 70 are formed in a double rod type with a single cylinder body, they are arranged in the housing 20 with different circumferential directions. In comparison, the layout efficiency in a limited space in the housing 20 can be increased. For example, four upper lifting cylinders 50 and four lower lifting cylinders 60 are provided, and are arranged at different positions in the circumferential direction so as not to interfere with the upper and lower lifting cylinders 50, 60. Compared to the case where the load transfer cylinder 70 is arranged, it is easy to secure a space for arranging the load transfer cylinder 70.

  Since the hydraulic pressure sensor 80 for detecting the hydraulic pressure of the load transfer cylinder 70 is attached to the load transfer cylinder 70, for example, the hydraulic pressure of the load transfer cylinder 70 is predetermined without visual confirmation by the operator. Completion of load transfer can be determined when the value is reached. Thereby, raising / lowering of the carrier main body S can be performed by an automatic driving | operation.

  In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.

  For example, in the present embodiment, in addition to the upper lifting cylinder 50 and the lower lifting cylinder 60 for the stroke at the time of lifting, the load shifting cylinder 70 for transferring the load is provided. It is not necessary to provide the load transfer cylinder 70. In this case, confirmation of the transfer of the load may be performed by visual observation as in the related art, or may be determined by the hydraulic pressure of the upper and lower lifting cylinders 50 and 60.

  Further, for example, in the present embodiment, an example has been described in which the completion of load transfer is determined by the hydraulic sensor 80 provided in the load transfer cylinder 70, but a stroke sensor or the like is used instead of the hydraulic sensor. May be.

  Further, for example, in the present embodiment, the stroke amount of the upper and lower lifting cylinders 50 and 60 has been described by using an example in which the stroke amount of the plurality of pads 12... The upper and lower lifting cylinders 50 and 60 may be hydraulic cylinders having a stroke of one pitch or more of the leg 10 as the stroke amount.

  The present invention can be variously modified and changed without departing from the spirit and scope of the present invention described in the claims.

  As described above, according to the present invention, it is possible to improve the efficiency of the lifting / lowering work of the main body by reducing the waiting step when the main body of the main body is lifted / lowered in the lifting work table ship. There is a possibility that the present invention is suitably used in the field of manufacturing industries of trolleys equipped with this type of lifting work table craft.

DESCRIPTION OF SYMBOLS 1 Lifting apparatus 10 ... 10 Plural legs 12 ... 12 Plural pads (plural engaged parts)
20 Housing 30 First frame 33 First engagement means 40 Second frame 43 Second engagement means 50... 50 Upper lifting cylinder (first cylinder)
60 ... 60 Lower lifting cylinder (second cylinder)
70 ... 70 Load transfer cylinder (third cylinder)
80 ... 80 Load transfer sensor P Elevating work platform S S

Claims (7)

With multiple legs fixed by landing on the seabed,
A trolley body that can be raised and lowered along the plurality of legs;
An elevating work table ship comprising an elevating device for elevating and lowering the main body of the ship,
The plurality of legs have a plurality of engaged portions that extend in the vertical direction and are arranged intermittently vertically.
The lifting device is
Each of the plurality of legs can be inserted and a housing fixed to the base body,
A first frame that is accommodated so as to be movable in the axial direction with respect to the housing, and includes a first engagement means that can be engaged with and disengaged from the engaged portion;
A second frame that is accommodated so as to be movable in the axial direction with respect to the housing, and has a second engagement means that can be engaged with and disengaged from the engaged portion;
A first cylinder for moving the first frame relative to the housing in an axial direction;
A second cylinder for moving the second frame relative to the housing in the axial direction,
The maximum lift amount of said 1st cylinder and said 2nd cylinder corresponds to 1 pitch of the up-down direction of these to-be-engaged parts, The raising / lowering type work platform ship characterized by the above-mentioned.   When the first cylinder is shortened, the second engaging means is engaged with the leg and the second cylinder is extended, and when the second cylinder is shortened, the first cylinder 2. The structure according to claim 1, wherein the engagement means is engaged with the leg and the first cylinder is extended, whereby the main body is lifted and lowered. Elevating work platform ship.   The said 1st and 2nd engagement means is comprised so that engagement can be cancelled | released by receiving a load at the time of engagement, and removing a load. Elevating work platform ship.   The said 2nd frame is further provided with the 3rd cylinder which moves the said housing and the said 2nd frame relatively to an axial direction, The any one of Claims 1-3 characterized by the above-mentioned. The lift platform work as described.   The stroke amount of the third cylinder is such that the load can be transferred from one engagement means receiving the load of the main body of the first and second engagement means to the other engagement means. 5. The lifting work platform ship according to claim 4, wherein the lift work platform ship has a small stroke amount and is set to be shorter than the stroke amounts of the first and second cylinders.   The lifting / lowering work platform ship according to claim 4 or 5, wherein the second cylinder and the third cylinder are of a double rod type in which a cylinder body is integrated.   The lifting / lowering operation according to any one of claims 4 to 6, wherein a load transfer sensor for detecting a load transfer state is attached to the third cylinder. Trolley.

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