JP2004137715A - Mounting method of rack type lift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily mounting two sets of rack type lift vertically coupled on a leader. <P>SOLUTION: In the mounting method of the rack type lift, first, the upper rack type lift 1 hung down is lifted up and the pinion gear 11 is meshed with the rack 62 of the leader 60 to enable the moving up and down motion along the leader 60. Next, the lower rack type lift 2 is hung down to the upper lift 1 to lift up the lower rack type lift 2 by the upper rack type lift 1. The pinion gear 21 is meshed with the rack 62 to enable the moving up and down motion along the leader 60. Thereafter, the upper and lower rack type lifts 1, 2 are connected together by couplers 3, 4, 5 to integrally move up and down along the leader 60. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rack-type elevating device that moves up and down along a mounted reader, and particularly to a mounting method of the rack-type elevating device that integrally connects two upper and lower rack-type elevating devices and moves up and down along the reader. .
[0002]
[Prior art]
For example, in construction using a working machine equipped with a working device such as an auger, a leader 102 is provided at the front of a pile driver 101 as a base machine, as disclosed in Japanese Patent Publication No. 6-78617 shown in FIG. An auger 110 and a rack-type elevating device 120 are mounted on the reader 102 so as to be able to move up and down. The work machine 100 is rotated by an auger 110, and excavation is performed by an auger screw attached to the auger 110 by elevating the rack type elevating device 120.
[0003]
FIG. 17 is a plan view showing a mounted state of the rack-type lifting device 120 in the work machine 100. In the leader 102 of the pile driver 101, a rack 105 is fixed at an intermediate position between a pair of guide pipes 104, 104, and a rack type elevating device 120 sandwiches the guide pipes 104, 104 so that guide gibs 121, 121 can slide. The rack 105 is engaged with a pair of pinion gears 122 from both sides. Then, by driving the hydraulic motors 123, the respective pinion gears 122, 122 rotate via the gear reduction mechanism to roll the rack 105, and the rack type elevating device 120 moves up and down the auger 110.
[0004]
By the way, in the construction using such a working machine 100, there has conventionally been a demand for increasing the lifting force of the rack-type lifting device 120 in order to increase the press-fitting and pulling-out force of the auger screw. As means for increasing the lifting force, it is conceivable to increase the capacity of the hydraulic motors 123, or to increase the supply pressure of the hydraulic oil for driving the hydraulic motors 123, 123. However, in this case, the gear strength of the pinion gears 122 and 122 and the rack 105 is insufficient, and a design change such as increasing the tooth width and the module is required. Therefore, as a method of increasing the lifting force by using the rack type lifting device currently owned, two rack type lifting devices are vertically connected.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 6-78617 (pages 2-3, FIGS. 2 and 3)
[0006]
[Problems to be solved by the invention]
However, when two rack-type elevating devices connected to the reader are mounted, it is extremely difficult and time-consuming to engage the pinion gears located above and below simultaneously with the rack. In other words, in the conventional method, two rack-type elevating devices connected in advance vertically are lifted by a crane, and two pairs of pinion gears are engaged with the rack so as to fit them from the front of the reader. However, the phases of the respective pinion gears must be aligned so as to mesh with the rack at the same time, and it is not easy to mesh with each other.
[0007]
In view of the above, an object of the present invention is to provide a method for easily mounting a rack-type elevating device on a reader while two rack-type elevating devices are vertically connected to each other.
[0008]
[Means for Solving the Problems]
The mounting method of the rack-type elevating device according to the present invention includes a rack-type elevating device that meshes a pinion gear with a rack formed on the leader and moves up and down along the leader while sliding a guide gib on a guide pipe by rotation of the pinion gear, A method for connecting two units vertically and mounting them on a leader, wherein a pinion gear is lifted up by a rack-type elevating device suspended from a state where a guide gib is slidable on a guide pipe, so that the pinion gear is mounted on a rack of the reader. The upper rack-type elevating device can be moved up and down along the leader by rotation of the pinion gear, and the lower rack-type elevating device can be slid on the guide pipe by moving the lower rack-type elevating device to the upper elevating device. And lift the lower rack-type elevating device by the upper rack-type elevating device. The gear is meshed with the rack to enable the lower rack-type elevating device at the lower portion to be moved up and down along the leader by rotation of the pinion gear, and then the upper and lower rack-type elevating devices are integrally moved up and down along the leader. It is characterized by being connected by connecting means.
[0009]
Therefore, in the present invention, the number of work procedures is increased because the rack-type elevating device is mounted stepwise in the order of the upper part and the lower part as compared with a method of hanging the two units integrally with a crane and mounting them from the front. Since the work of each one is simple and it is particularly easy to engage the pinion gear with the rack, it is easy to mount the rack type lifting device on the reader with two rack type lifting devices connected vertically. Will be able to do it.
[0010]
Further, in the mounting method of the rack type lifting device according to the present invention, the connected upper and lower rack type lifting devices are supplied with hydraulic oil from the same line for each hydraulic motor that rotates a pinion gear, The lower rack-type elevating device, which is raised and lowered by the upper rack-type elevating device and meshes a pinion gear of the lower rack-type elevating device with a rack. The hydraulic oil is supplied to the hydraulic motor from a separate line from the upper rack-type elevating device.
[0011]
Since the upper and lower rack type elevating devices always move up and down integrally, there is no need to drive them separately using a complicated hydraulic circuit, so that hydraulic oil may be supplied through the same line. However, when the lower rack-type elevating device is lifted by the upper rack-type elevating device, hydraulic oil flows only into the lower rack-type elevating device in which the pinion gear is not meshed with the rack. Therefore, in this process, it is possible to raise the rack-type elevating device by separating the hydraulic oil supply line once, and to perform mounting while simplifying the hydraulic supply line to the rack-type elevating device. it can.
[0012]
Further, the connecting structure of the rack type lifting device according to the present invention is such that two racks which move up and down along the leader while engaging a pinion gear with a rack formed on the leader and sliding a guide gib on a guide pipe by rotation of the pinion gear. A structure for vertically connecting the lifting device to move up and down integrally, wherein the rack-type lifting device has a mounting portion for mounting a connection bracket for connecting the working device downward, which is formed in the device body, The upper rack-type elevating device is provided with two connecting brackets, the lower rack-type elevating device is provided with a working device mounting bracket, and the upper and lower connecting brackets are connected by a connecting member. There is a feature.
[0013]
Therefore, according to the present invention, when performing the above-described mounting method, the upper and lower rack-type elevating devices can be mounted on the reader even when the connecting bracket is mounted, and the mounting member can be easily mounted by the connecting member even after mounting. The upper and lower rack-type lifting devices can be integrally connected. Further, according to this connection structure, the above-described mounting method can be performed without making any changes to the rack-type elevating device itself.
[0014]
Also, the hydraulic oil supply line to the rack type lifting device according to the present invention engages a pinion gear with a rack formed in the leader, and moves up and down along the leader while sliding a guide gib on a guide pipe by rotation of the pinion gear. The two rack type elevating devices are vertically connected so as to be able to move up and down integrally, and the connected upper and lower rack type elevating devices are operated from the same line for each hydraulic motor that rotates the pinion gear. Oil is supplied, and a throttle is provided on an ascending line for supplying hydraulic oil for elevating the lower rack-type elevating device.
[0015]
In the above-described mounting method, when hydraulic oil is supplied to the upper and lower rack-type elevating devices by the same line, a line for temporarily supplying hydraulic oil to the lower rack-type elevating device must be separately provided. However, according to the present invention, the hydraulic oil sent to the lower rack-type elevating device causes resistance due to the throttle, and by applying the same load as driving the hydraulic motor of the upper rack-type elevating device, The hydraulic oil can be supplied to the upper rack-type elevating device without disconnecting the ascending line to the rack-type elevating device, and the mounting method described above can be performed.
[0016]
Further, the hydraulic circuit of the rack-type lifting device according to the present invention includes two racks that move up and down along the leader while engaging a pinion gear with a rack formed on the leader and sliding a guide gib on a guide pipe by rotation of the pinion gear. Hydraulic oil is supplied from the same line to each hydraulic motor that rotates the pinion gears to the connected upper and lower rack-type lifting devices so that the lifting devices can be integrally lifted and lowered. A pressure oil for releasing the brake is supplied via a shuttle valve and a switching valve to a negative brake for releasing the brake by supplying hydraulic oil for driving a hydraulic motor to the lower rack-type elevating device. A switching valve is provided in the circulation flow path formed so that the hydraulic oil flowing when the hydraulic motor is rotated by an external force is circulated. And characterized in that provided.
[0017]
According to the present invention, each switching valve is switched to release the negative brake by the pressure oil sent via the shuttle valve, and the hydraulic oil sent by the external force acting on the hydraulic motor by the pinion gear meshing with the rack. The hydraulic motor runs idle in the circulation channel. Therefore, in the mounting method described above, it is necessary to temporarily separate a line for supplying hydraulic oil to the lower rack-type elevating device. However, according to the present invention, the line to the lower rack-type elevating device is once cut off. By causing the hydraulic motor to idle, the mounting method described above can be executed.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a mounting method of a rack elevating device according to the present invention and a connection structure for executing the same will be described below with reference to the drawings. FIG. 1 is a side view showing rack elevating devices 1 and 2 of the present embodiment connected vertically, and FIG. 2 is a front view thereof. The two rack elevating devices 1 and 2 have the same structure, each having a pair of pinion gears 11 or 21 so as to sandwich the leader rack from both sides, and each of them is rotationally driven by two hydraulic motors. It is configured as follows. When mounted on the leader, the pinion gears 11 or 21 mesh with the rack, and two pairs of upper and lower guide gibs 12, 13 or 22, 23 are slidably sandwiched between the guide pipes of the leader on the outside thereof. I have.
[0019]
The rack elevating devices 1 and 2 have mounting holes 14a, 14b or 24a, 24b formed on the upper and lower sides, and a connecting bracket is pinned to these, so that a working device such as an auger can be mounted. In the present embodiment, since the two rack elevating devices 1 and 2 are integrated, the upper rack elevating device (hereinafter, referred to as “upper elevating device”) 1 is provided with a double connecting bracket 3 and a lower connecting bracket 3. A connection bracket 4 for a working device is attached to a rack elevating device (hereinafter, referred to as a “lower elevating device”) 2, and both are connected by a connecting pipe 5. A connecting pipe 5 for connecting the upper and lower lifting devices 1 and 2 is pivotally mounted on the upper connecting bracket 3 so as to be swingable in the front-rear direction. Be worn.
[0020]
Hydraulic motors of the upper and lower lifting devices 1 and 2 are supplied with hydraulic oil from a pile driving machine, which is a base machine, and are collected and recovered by a hydraulic pump or a tank. A drain hose for collecting drain oil from the hydraulic motor is connected. Here, FIG. 13 is a diagram showing a motor drive circuit of the upper and lower lifting devices 1 and 2. Each of the upper and lower lifting devices 1 and 2 includes the same pair of left and right hydraulic motors 25, 25 or 35, 35 as shown in the figure, and a motor drive circuit 20, 20 for each hydraulic motor 25, 25, 35, 35. , 30, 30 are constituted.
[0021]
The piling machine is provided with a hydraulic pump and a tank for supplying hydraulic oil, and respective hydraulic hoses connected thereto are branched into upper and lower lifting devices 1 and 2 to form an ascending line 6 and a descending line 7. Connected. The ascending line 6 and the descending line 7 are further branched and connected to a pair of motor drive circuits 20, 20, or 30, 30, respectively. Similarly, the drain line 8 branches into the upper and lower elevating devices 1 and 2 and further branches into the respective hydraulic motors 25 and 25 or 35 and 35, and is directly connected. In this embodiment, the ascending line 6, the descending line 7, and the drain line 8 are all connected to the hydraulic motors 25, 25, 35, 35 of the upper and lower lifting devices 1, 2 by the same line. This is because it is not necessary to separately drive the upper and lower lifting devices 1 and 2 using a complicated hydraulic circuit in order to always perform the same lifting operation.
[0022]
The ascending line 6 and the descending line 7 are connected to brake valves 26 and 36 of the motor drive circuits 20 and 30, and cross relief valves 27 and 28 are provided in flow paths that reciprocate from the brake valves 26 and 36 to the hydraulic motors 25 and 35. Or, 37 and 38 are connected in reverse parallel. The brake valve 26 or 36 is for preventing reverse rotation of the hydraulic motor 25 or 35 and for holding up and down, and the cross relief valve 27, 28 or 37, 38 is for reducing hydraulic pressure when the hydraulic motor 25 or 35 is overloaded. This is for preventing an excessive increase. Further, negative brakes 29 and 39 are connected to the brake valves 26 and 36, respectively, so that the brakes can be released by the pressure of hydraulic oil for rotating the hydraulic motors 25 and 35.
[0023]
Next, a method for mounting the two rack elevating devices on the reader will be described following the operation procedure. 3 to 12 are views showing a method of integrally mounting the upper lifting device 1 and the lower lifting device 2 to the reader according to the operation procedure. In the present embodiment, the upper and lower lifting devices 1 and 2 are separately mounted, and first, the upper lifting device 1 with the connecting pipe 5 mounted on the connecting bracket 3 is mounted on the leader of the pile driver. Therefore, the upper elevating device 1 is suspended at four points as shown by a two-dot chain line in FIG. 3 and is placed in a state of being laid down in front of a reader (not shown).
[0024]
A wire rope 51 from a winch is sent forward over the sheave at the upper end of the leader, and is connected to the lifting bracket 41 of the upper lifting device 1. When the winch of the pile driver body is operated and the wire rope 51 is wound up, the upper lifting device 1 is lifted up as shown in FIG. 4, and the posture is gradually raised by inclining the roller 42 as a fulcrum. The connection pipe 5 attached to the shaft has its lower end side brought into contact with the ground and changes its inclination as the height of the shaft changes. At this time, a sleeper 43 is attached to the lower end of the pipe so that the lower bracket 5b is not broken. It is preferable to float the bracket 5b so that no load is applied to the bracket 5b.
[0025]
When the wire rope 51 is further wound, the upper lifting device 1 stands up as shown in FIG. 5, but at this time, the guide pipe 61 at the lower end of the leader 60 is sandwiched by the upper guide gib 12. The upper lifting device 1 is further pulled up from there by a wire rope 51, and the guide gib 12 slides on the guide pipe 61 and rises along the leader 60, and as shown in FIG. In between. Since the rack 62 is not formed at the lower end of the leader 60, the pinion gear 11 has not yet engaged.
[0026]
Then, the upper elevating device 1 is slowly pulled up by adjusting the phase of the pinion gear 11, and the pinion gear 11 is rotated to mesh with the rack 62. If the supply of hydraulic oil is stopped after the pinion gear 11 meshes with the rack 62, the negative brake 29 is applied and the non-rotating pinion gear 11 is locked, so that the upper lifting device 1 falls even if the wire rope 51 is removed. Without being attached to the reader 60. After that, the upper lifting device 1 rotates the pinion gear 11 to mount the lower lifting device 2 next, raises the reader 60, and temporarily retreats upward.
[0027]
The lower lifting device 2 is suspended at four points as shown by a two-dot chain line in FIG. Then, when the wire rope 51 that has been lowered through the upper elevating device 1 is connected to the lifting bracket 45 and the wire rope 51 is wound up by the winch of the pile driver body, the lower elevating device 2 becomes as shown in FIG. The guide pipe 61 at the lower end of the leader 60 is sandwiched between the guide gibs 22 standing upright. At this time, the ascending line 6, the descending line 7, and the drain line 8 are not connected to the lower elevating device 2, and instead, another line such as a hydraulic hose 65 is connected.
[0028]
When the ascending line 6, the descending line 7, and the drain line 8 are connected at this stage as shown in FIG. 13, the rack 62 is still connected to the rack 62 as compared with the upper elevating device 1 in which the pair of pinion gears 11, 11 are engaged. This is because the hydraulic oil flows only to the lower lifting device 2 where no load is applied because the pinion gear 21 is not meshed, and the upper lifting device 1 cannot be raised or lowered. Therefore, a line for supplying hydraulic oil is once provided separately in the lower lifting device 2, and the hydraulic motors 25, 25 and the hydraulic motors 35, 35 are driven by hydraulic oil supplied on separate lines.
[0029]
Next, as shown in FIG. 10, the upper lifting device 1 that has been once raised is lowered, and the lower lifting device 2 is connected to the lower lifting device 2 by a suspension wire 46. Then, the upper lifting device 1 is slowly raised by the supply of the hydraulic oil from the rising line 6 (see FIG. 13), and is lifted by it. The lower lifting device 2 also raises the reader 60 to move the pinion gears 21 and 21 to the rack 62. Will be engaged. At this time, if the phases of the pinion gears 21 and 21 and the rack 62 match, the gears are raised and engaged. When a phase shift occurs between the paired pinion gears 21 and 21, the phases are adjusted using a bar or the like, and then the pinion gears 21 and 21 are engaged with the rack 62.
[0030]
After the pinion gears 21 and 21 mesh with the rack 62, if the supply of the hydraulic oil is stopped, the negative brake is applied and the non-rotating pinion gears 11 and 11 are locked, so that the suspension wires 46 as shown in FIG. Is removed, the lower elevating device 2 stops at that height. Thereafter, as shown in FIG. 12, the upper lifting device 1 is lowered, and the connecting pipe 5 is pivotally mounted on the connecting bracket 4 of the lower lifting device 2, so that the two upper and lower rack-type lifting devices become one. The lower lifting device 2 is also connected to the ascending line 6, the descending line 7, and the drain line 8, and the supply of hydraulic oil between the motor drive circuits 20, 20, 30, 30 through the same line as shown in FIG. Will be done
[0031]
Therefore, when the ascending operation is performed in the cockpit of the pile driver (see FIG. 13), the hydraulic oil flows into the ascending line 6, and the negative brakes 29 and 39 are first released by the pressure of the hydraulic oil flowing from the ascending line. Thereafter, since the brake valves 26 and 36 are switched, the hydraulic oil flows out to the descending line 7 through the hydraulic motors 25 and 35. As a result, the hydraulic motors 25 and 35 output rotation by the hydraulic energy of the hydraulic oil, and the pinion gears 11, 11, 21 and 21 meshing with the same rack 62 roll, so that the upper and lower lifting devices 1 and 2 are the same. Rise together at speed.
[0032]
Conversely, when the descending operation is performed in the cockpit of the pile driver, hydraulic oil flows into the descending line 7, and the negative brakes 29 and 39 are first released by the pressure of the hydraulic oil flowing from the descending line. Thereafter, the hydraulic oil flows out to the ascending line 6 through the hydraulic motors 25 and 35 because the brake valves 26 and 36 are switched in reverse. As a result, the hydraulic motors 25 and 35 output reverse rotation due to the hydraulic energy of the hydraulic oil, and the pinion gears 11, 11, 21 and 21 meshing with the same rack 62 roll, so that the upper and lower elevating devices 1 and 2 are rotated. It descends together at the same speed.
[0033]
Thus, in the present embodiment, the two linked lifting devices 1 and 2 are simultaneously driven, so that the conventional structure such as a hydraulic motor is changed while the pinion gears 11 and 21 and the rack 62 are kept at the existing size. And the lifting force could be increased.
[0034]
In the present embodiment, each work is simpler, although the work procedure is increased, and the pinion gear 11 is particularly easily connected to the rack 62 in comparison with a method in which the two units are integrally connected and hung by a crane and mounted from the front. Therefore, the two lifting devices 1 and 2 can be easily mounted on the reader 60.
Further, when the lower elevating device 2 is mounted on the reader 60, it is lifted by the upper elevating device 1, so that if a crane truck is used, difficult work can be easily performed because the upper elevating device 1 is in the way.
[0035]
Further, the rack elevating device according to the present embodiment has mounting holes 14a, 14b or 24a, 24b formed therein, and is attached to the connection bracket 4 for attaching a working device such as an auger to the lower elevating device 2, and to the upper elevating device 1. The two-stage connection bracket 3 is detachable. Therefore, the connection structure for connecting the two connection brackets 3 and 4 with the connection pipe 5 can easily integrate the two rack lifting devices without changing the lifting device itself.
[0036]
By the way, in the above embodiment, when the pinion gear 21 of the lower elevating device 2 is engaged with the rack 62, the hydraulic oil is taken in by using a hydraulic hose 65 or the like on a separate line from the upper elevating device 1. By making such a change, it becomes possible to eliminate the need to take in hydraulic oil on another line. FIG. 14 and FIG. 15 are diagrams showing a motor drive circuit of the lifting devices 1 and 2.
[0037]
The motor drive circuit shown in FIG. 14 has the same configuration as that of FIG. 13 described above for the upper and lower elevating devices 1 and 2, but a restrictor 47 is provided on the ascending line 6 that sends hydraulic oil to the lower elevating device 2. Is provided. Therefore, if hydraulic oil is fed from the hydraulic pump to the ascending line 6, the resistance of the throttle 47 causes the hydraulic motors 35, 35 to run on the lower elevating device 2 side as well as pass through the hydraulic motor 25 of the upper elevating device 1. Load. Therefore, the hydraulic motor 25 of the upper elevating device 1 is driven while rotating the pinion gear 21 of the lower elevating device 2 which is not meshed with the rack 62 without supplying the hydraulic oil to the lower elevating device 2 side by another line. The pinion gear 11 meshing with the rack 62 can be rolled up and raised. Therefore, according to this, a hydraulic hose constituting another line is not required, and the labor for connection can be saved.
[0038]
Next, in the motor drive circuit shown in FIG. 15, a solenoid valve 49 is connected to the negative brakes 39 and 39 via shuttle valves 48 and 48 by changing the lower lift device 2 side, and the hydraulic motors 35 and 35 are further connected. Solenoid valves 50, 50 are connected to a flow path connected to circulate the hydraulic oil. Therefore, as shown in FIG. 10, when the pinion gear 21 of the lower elevating device 2 is engaged with the rack 62, the lower elevating device 2 is not connected to the ascending line 6, the descending line 7, and the drain line 8 from the cockpit. The solenoid valves 49, 50, 50 are switched by the operation of.
[0039]
Thereby, the negative brake 39 is released by the pressure oil sent from the solenoid valve 49 through the shuttle valve 48, and the hydraulic oil sent from the hydraulic motor 35 by the external force can circulate through the circuit passing through the solenoid valve 50. . Then, the upper lifting device 1 is slowly raised by the supply of the hydraulic oil sent from the lifting line 6, and the lower lifting device 2 is pulled up by the hanging wire 46 to lift the reader 60. At this time, in the lower elevating device 2, since the hydraulic motor 35 idles, the pinion gear 21 that has hit the rack 62 rolls and meshes with the rack 62.
[0040]
If the lowering device 2 returns the switching of the solenoid valves 49, 50, 50 as shown in the figure again after the pinion gear 21 meshes with the rack 62, the negative brake 39 is applied and the rotation of the hydraulic motor 35 is restricted. The non-rotating pinion gear 21 is locked. Then, the upper elevating device 1 is lowered, and the connecting pipe 5 is axially mounted on the connecting bracket 4 of the lower elevating device 2, so that the two upper and lower devices become one. Thereafter, the ascending line 6, the descending line 7, and the drain line 8 are connected to the lower elevating device 2 as shown in FIG.
[0041]
As described above, the embodiments of the mounting method of the rack type elevating device and the connection structure for executing the method have been described. However, the present invention is not limited thereto, and various changes may be made without departing from the gist of the present invention. It is possible.
For example, the operating oil is supplied to the upper and lower elevating devices 1 and 2 through the same ascending line 6 and the descending line 7, but a control valve or the like is provided to the upper and lower elevating devices 1 and 2 separately or simultaneously. The hydraulic oil may be supplied.
[0042]
【The invention's effect】
The present invention first raises the suspended upper rack type elevating device, meshes its pinion gear with the rack of the reader to enable elevating along the reader, and then connects the lower rack type elevating device to the upper elevating device. Hanging, raising the lower rack type lifting device by the upper rack type lifting device, meshing the pinion gear with the rack to enable lifting and lowering along the reader, and then moving the upper and lower rack type lifting device along the reader Since the connection is made by the connecting means so as to move up and down integrally, two rack-type lifting devices can be easily attached to the reader with two rack-type lifting devices connected vertically.
[Brief description of the drawings]
FIG. 1 is a side view showing a rack elevating device connected vertically.
FIG. 2 is a front view showing a vertically moving rack elevating device.
FIG. 3 is a diagram showing a process of mounting the upper elevating device on a reader.
FIG. 4 is a view showing a process of mounting the upper elevating device on the reader.
FIG. 5 is a view showing a process of mounting the upper elevating device on the reader.
FIG. 6 is a view showing a step of mounting the upper elevating device on the reader.
FIG. 7 is a diagram showing a state where the upper lifting device is mounted on the reader.
FIG. 8 is a view showing a process of mounting the lower lifting device on the reader.
FIG. 9 is a view showing a process of mounting the lower lifting device on the reader.
FIG. 10 is a view showing a process of mounting the lower elevating device on the reader.
FIG. 11 is a diagram showing a state where the lower lifting device is mounted on the reader.
FIG. 12 is a view showing a process of connecting the upper and lower lifting devices mounted on the reader.
FIG. 13 is a diagram showing a motor drive circuit of the upper and lower lifting devices.
FIG. 14 is a diagram showing a motor drive circuit of the upper and lower lifting devices.
FIG. 15 is a diagram showing a motor drive circuit of the upper and lower lifting devices.
FIG. 16 is a diagram showing a working machine using a rack-type elevating device.
FIG. 17 is a plan view showing a mounted state of the rack type elevating device.
[Explanation of symbols]
1,2 rack type lifting device
3,4 Connecting bracket
5 Connecting pipe
6 Ascent line
7 Descending line
11,21 pinion gear
20, 30 Motor drive circuit
25,35 hydraulic motor
60 Reader
62 racks

Claims (5)

A rack-type elevating device that meshes a pinion gear with a rack formed on the leader and that moves up and down along the leader while sliding the guide gib on the guide pipe by rotation of the pinion gear is connected to the upper and lower two rack-type elevating devices for mounting on the reader. The method
By pulling up the upper rack-type elevating device suspended in a state where the guide gib is slidable on the guide pipe, the pinion gear meshes with the rack of the reader, and the upper rack-type elevating device is rotated by the rotation of the pinion gear. To allow for ascending and descending along
The lower rack-type elevating device is suspended from the upper elevating device with the guide gib slidable on the guide pipe, and the lower rack-type elevating device is lifted by the upper rack-type elevating device, and the pinion gear is moved to the rack. The lower rack-type elevating device is meshed with the lower elevating device so that the elevating device can be moved up and down along the leader by rotation of the pinion gear,
Thereafter, the upper and lower rack-type elevating devices are connected by connecting means so as to be integrally lifted and lowered along the reader. The mounting method of the rack type lifting device according to claim 1,
The connected upper and lower rack-type elevating devices are configured such that hydraulic oil is supplied to each hydraulic motor that rotates a pinion gear from the same line, and that the hydraulic motors move up and down along a leader,
When the pinion gear of the lower rack-type elevating device is engaged with a rack by raising the upper rack-type elevating device, the hydraulic motor of the lower rack-type elevating device is different from the upper rack-type elevating device. A method of mounting a rack-type elevating device, wherein hydraulic oil is supplied from a line. A pinion gear is meshed with a rack formed on the leader, and two rack-type elevating devices that move up and down along the leader while sliding the guide gib on the guide pipe by the rotation of the pinion gear are vertically connected so as to integrally move up and down. The structure of
In the rack-type lifting device, a mounting portion for mounting a connection bracket that connects the working device downward is formed in the device main body,
The upper rack-type elevating device is provided with two connecting brackets, the lower rack-type elevating device is provided with a working device mounting bracket, and the upper and lower connecting brackets are connected by a connecting member. A coupling structure of a rack type lifting device. A pinion gear meshes with a rack formed on the leader, and two rack-type elevating devices that move up and down along the leader while sliding a guide gib on a guide pipe by rotation of the pinion gear are connected vertically so that they can be integrally moved up and down. The connected upper and lower rack type elevating devices are supplied with hydraulic oil from the same line for each hydraulic motor that rotates the pinion gear,
A hydraulic oil supply line to the rack-type lifting device, wherein a throttle is provided on a lifting line for supplying hydraulic oil for raising the lower rack-type lifting device. A pinion gear meshes with a rack formed on the leader, and two rack-type elevating devices that move up and down along the leader while sliding a guide gib on a guide pipe by rotation of the pinion gear are connected vertically so that they can be integrally moved up and down. The connected upper and lower rack-type elevating devices are supplied with hydraulic oil from the same line for each hydraulic motor that rotates the pinion gear,
For the lower rack-type elevating device, pressure oil for releasing the brake is supplied via a shuttle valve and a switching valve to a negative brake for releasing the brake by supplying hydraulic oil for driving a hydraulic motor, A hydraulic circuit for a rack-type elevating device, wherein a switching valve is provided in a circulation flow path formed so that hydraulic oil flowing when a motor is rotated by an external force is circulated.

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