Cylinder rack maintenance cart and rack frame removal method using the same

Abstract

To allow a single worker to carry a frame in and out and temporarily store the removed frame even in a narrow area.SOLUTION: A cylinder rack maintenance cart is used to transport a cylinder rack storing multiple cylinders at the time of maintenance, and comprises: an upper cart and a lower cart connected so that they can move vertically; a jack supporting the upper cart and lower cart; a fork fixed to the upper cart and lifting the cylinder rack; and casters attached to the lower cart. The cylinder rack maintenance cart is characterized in that the upper cart can be moved vertically by the jack and the casters can move vertically and horizontally.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a cylinder rack maintenance cart and a rack frame transport method using the same, and more particularly to a cylinder rack maintenance cart suitable for use when maintaining cylinder racks that constitute gas supply equipment installed in nuclear power generation facilities, and a rack frame transport method using the same. [Background technology]

[0002] Cylinder racks for nuclear power plants consist of a cylinder and a frame that holds the cylinder, and because earthquake resistance must be taken into consideration, the frame tends to be heavier than cylinder racks for general industrial use.

[0003] In the cylinder racks (10 cylinders per row, 2 rows of 5 cylinders) that have been delivered to nuclear power plants, in addition to the outer frame that holds the cylinders, a frame (weight approximately 75 kg) is installed in the center of the rack to ensure earthquake resistance.

[0004] In addition, it is common for multiple cylinder racks for nuclear power plants to be installed in close proximity to each other. When replacing cylinders by refilling them, etc., it is necessary to remove the outer frame on the front row of cylinders, take out the five cylinders installed in the front row, remove the center frame, temporarily place them, and then take out the five cylinders in the back row.

[0005] Although not a cylinder rack for a nuclear power plant, Patent Document 1 describes a food freezing system that allows racks to be easily and reliably transported in and out of a freezing device using a dedicated cart.

[0006] Patent document 1 states that "the series of processes can be easily carried out, including carrying a rack with the food to be frozen inside the freezing device, removing the rack after the freezing process from the freezing device, and transporting it to a freezer for storage." [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2006-262725 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the above-mentioned cylinder rack for nuclear power plants, the central frame is heavy, so multiple people are required to move it manually. Moreover, cylinder racks for nuclear power plants are generally installed in narrow areas, making it difficult for multiple people to work on them.

[0009] Furthermore, the above-mentioned Patent Document 1 describes a food freezing system in which a single worker can easily and reliably carry frames into and out of the freezing device, but the food freezing system described in Patent Document 1 does not take into consideration workability in narrow areas, and furthermore, multiple people are required to temporarily place the frames after removal.

[0010] The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a cylinder rack maintenance cart that allows a single worker to transport a frame in and out even in a narrow area, and that enables the frame to be temporarily placed after being transported, and a rack frame transport method using the same. [Means for solving the problem]

[0011] In order to achieve the above-mentioned objective, the cylinder rack maintenance cart of the present invention is a cylinder rack maintenance cart used to transport a cylinder rack storing a plurality of cylinders during maintenance of the cylinder rack, and comprises an upper cart and a lower cart connected so as to be movable vertically, a jack supporting the upper cart and lower cart, a fork fixed to the upper cart for lifting the cylinder rack, and casters attached to the lower cart, and the cylinder rack maintenance cart is characterized in that the upper cart can be moved vertically by the jack, and the casters can move the upper cart vertically and horizontally.

[0012] In order to achieve the above object, the method for carrying out a rack frame using a cylinder rack maintenance cart of the present invention comprises the steps of: carrying out a rack frame using a cylinder rack maintenance cart during maintenance of a cylinder rack that stores a plurality of cylinders; Fix the cylinder rack part and the fork of the cylinder rack maintenance cart with a guide pin, and remove the cylinder rack part by pulling out the entire cylinder rack maintenance cart from the cylinder rack; The cylinder rack maintenance cart is moved to the front of another cylinder rack using casters, and the cylinder rack maintenance cart is moved from the front of the other cylinder rack so as to sandwich the other cylinder rack, and the top of the cylinder rack maintenance cart and the other cylinder rack are fixed together using chains installed on the sides of the other cylinder rack, thereby temporarily placing the cylinder rack parts. Effect of the Invention

[0013] According to the present invention, even in a narrow area, a single worker can carry a frame in and out, and can temporarily place the carried-out frame. [Brief description of the drawings]

[0014] [Figure 1]1 is a front view showing a cylinder rack to be maintained by the cylinder rack maintenance cart of the present invention. FIG. [Diagram 2] 2 is a side view showing the central frame and the outer peripheral frame of the cylinder rack in FIG. 1. [Diagram 3] FIG. 1 is a front view showing a first embodiment of a maintenance cart according to the present invention. [Figure 4] 4 is a side view showing a cross section of the center of the cylinder rack of the maintenance cart shown in FIG. 3. [Figure 5(a)] This is a front view showing the state in which the cylinder rack part and the fork of the cylinder rack maintenance cart in embodiment 1 of the maintenance cart of the present invention are fixed with a guide pin, and the entire cylinder rack maintenance cart is pulled out from the cylinder rack to remove the cylinder rack part. [Figure 5(b)] FIG. 6 is a side view showing a cross section of the cylinder rack in FIG. 5(a) at its center. [Figure 6(a)] This is a front view showing the state in which the cylinder rack maintenance cart in embodiment 1 of the maintenance cart of the present invention is moved to the front of another cylinder rack using casters, and the cylinder rack maintenance cart is moved in front of the other cylinder rack so as to sandwich the other cylinder rack, and the top of the cylinder rack maintenance cart and the other cylinder rack are fixed together using chains installed on the side of the other cylinder rack, thereby temporarily placing cylinder rack parts. [Figure 6(b)] FIG. 7 is a side view showing a cross section of the cylinder rack in FIG. 6(a) at the center. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a cylinder rack maintenance cart and a rack frame transport system and a rack frame transport method using the same according to the present invention will be described based on the illustrated embodiments. EXAMPLES

[0016] Nuclear power plants are usually equipped with gas supply equipment that supplies compressed gas to various systems at a regulated pressure and flow rate. This gas supply equipment consists of cylinders, which are the pressure sources, and cylinder racks to store and secure the cylinders.

[0017] Cylinder racks are generally constructed with a wall-mounted or floor-standing frame made of welded channel steel made of structural rolled steel, and are capable of storing the required number of cylinders. The cylinders stored in the cylinder rack are fixed to the frame with bolts to prevent them from falling over, and the cylinders are secured in place by attaching two or one steel beams at the top and bottom to support fittings on the outer periphery of the frame, fixing the middle with a cylinder holding bolt, and fixing both ends with pins or bolts.

[0018] A cylinder rack having such a structure is shown in Figs.

[0019] As shown in Figures 1 and 2, the cylinder rack 12a stores and fixes multiple cylinders within a rectangular parallelepiped-shaped framework formed by multiple frames (a central frame 1a and an outer peripheral frame 1b). Two or one steel beams at the top and bottom are attached to support fittings on the outer peripheral frame, and the middle is fixed with a cylinder holding bolt 9.

[0020] In order to satisfy the earthquake resistance requirements of nuclear power generation facilities, the cylinder rack 12a is reinforced with multiple steel sections inside the outer frame 1b. When performing maintenance on the cylinder rack 12a, such as refilling the cylinders, the cylinders are removed from the cylinder rack 12a. At that time, it is necessary to remove the center frame 1a and carry it out of the cylinder rack 12a.

[0021] Conventionally, the central frame 1a is removed by manual force. However, because the central frame 1a is heavy, removal requires the work of multiple people, which takes a lot of time. In addition, during maintenance work, the central frame 1a needs to be temporarily placed in a place where it does not interfere with the work. Furthermore, if the cylinder rack 12a is installed in a narrow area, it is very difficult to remove and temporarily place the part 1 by manual force.

[0022] Therefore, the cylinder rack maintenance cart and the rack frame transport method using the same according to the present embodiment have solved the above problems.

[0023] The details will be described below with reference to Figs. 3, 4, 5(a), 5(b), 6(a) and 6(b).

[0024] FIG. 3 is a front view of the cylinder rack maintenance cart 10 of this embodiment, FIG. 4 is a side view of FIG. 3, FIG. 5(a) is a front view showing a state in which the cylinder rack part 11 and the fork 6 of the cylinder rack maintenance cart 10 are fixed with a guide pin 7 and the cylinder rack part 11 is removed by pulling the entire cylinder rack maintenance cart 10 out of the cylinder rack 12a, FIG. 5(b) is a side view of FIG. 5(a), and FIG. 6(a) is a front view showing the cylinder rack maintenance cart 10 being removed. FIG. 6(b) is a side view of FIG. 6(a), showing the state in which the cylinder rack maintenance cart 10 is moved to the front of another cylinder rack 12b using casters 1, and is moved in front of the other cylinder rack 12b so as to sandwich the other cylinder rack 12b, and the top of the cylinder rack maintenance cart 10 is fixed to the other cylinder rack 12b by chains 8 installed on the side of the other cylinder rack 12b, thereby temporarily placing the cylinder rack part 11.

[0025] 3, the cylinder rack maintenance cart 10 of this embodiment can move vertically and horizontally using casters 1 installed on the bottom, and moves to the front of the cylinder rack 12a to be maintained using these casters 1. The cylinder rack maintenance cart 10 has an upper cart 2 and a lower cart 3 with a sliding structure, and this sliding structure connects the upper cart 2 and the lower cart 3 of the cylinder rack maintenance cart 10 so that they can move vertically, and are supported by jacks 4.

[0026] The jack 4 is moved by a jack handle 5 attached to the lower part 3 of the cylinder rack maintenance cart 10. For example, the jack 4 is moved by moving the jack handle 5 up and down by a pumping action.

[0027] As shown in FIG. 4, the upper part 2 of the cylinder rack maintenance cart 10 has two forks 6 welded to the front for fixing and lifting the central frame 1a (see FIGS. 1 and 2) of the cylinder rack 12a, and the vertical height of the upper surface of these forks 6 is adjusted with the jack 4 using the jack handle 5 so that it is lower than the vertical height of the lower surface of the central frame 1a.

[0028] After this adjustment with the jack 4, the forks 6 are inserted from the front of the cylinder rack 12a and adjusted so that the forks 6 are positioned below the central frame 1a. Then, the jack 4 is operated using the jack handle 5 to move the upper cart 2 of the cylinder rack maintenance cart 10 vertically upward until the upper surfaces of the forks 6 come into contact with the underside of the central frame 1a and are further adjusted until it is raised by about 10 to tens of millimeters.

[0029] With the cylinder rack 12a lifted by the forks 6, the central frame 1a and the forks 6 are fixed by the guide pins 7 (see FIG. 5(b)), and the cylinder rack maintenance cart 10 is pulled out entirely from the cylinder rack 12a to remove the central frame 1a. After removing the central frame 1a, the casters 1 are used to move the cylinder rack maintenance cart 10 to the front of the other cylinder rack 12b, and the cylinder rack maintenance cart 10 is moved from the front of the other cylinder rack 12b so as to sandwich the other cylinder rack 12b, and the upper cart 2 of the cylinder rack maintenance cart 10 and the other cylinder rack 12b are fixed by the chains 8 on the sides of the other cylinder rack 12b, so that the central frame 1a can be temporarily placed and carried out without interfering with the maintenance work and without the risk of tipping over. When attaching the central frame 1a after maintenance, the above procedure is reversed.

[0030] According to this embodiment, even in a narrow area, one worker can carry a frame in and out, and the carried-out frame can be temporarily placed there.

[0031] The present invention is not limited to the above-described embodiments, and includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the configurations described. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0032] 1...caster, 1a...central frame, 1b...peripheral frame, 2...upper part of cylinder rack maintenance cart, 3...lower part of cylinder rack maintenance cart, 4...jack, 5...jack handle, 6...fork of cylinder rack maintenance cart, 7...guide pin, 8...chain, 9...cylinder holding bolt, 10...cylinder rack maintenance cart, 11...cylinder rack parts, 12a...cylinder rack, 12b...another cylinder rack.

Claims

1. A cylinder rack maintenance cart used for carrying in and out a cylinder rack that stores a plurality of cylinders during maintenance of the cylinder rack, The apparatus comprises an upper cart and a lower cart which are connected so as to be movable in the vertical direction, a jack which supports the upper cart and the lower cart, a fork which is fixed to the upper cart and which lifts the cylinder rack, and a caster which is attached to the lower cart, The cylinder rack maintenance cart is characterized in that the upper part of the cart can be moved vertically by the jack, and can be moved vertically and horizontally by the casters.

2. 2. The cylinder rack maintenance cart according to claim 1, A cylinder rack maintenance cart, characterized in that the casters are installed on the bottom of the cylinder rack maintenance cart.

3. 2. The cylinder rack maintenance cart according to claim 1, A cylinder rack maintenance cart characterized in that the fork and cylinder rack components are fixed with guide pins, and the entire cylinder rack maintenance cart is configured to be pulled out from the cylinder rack.

4. 4. The cylinder rack maintenance cart according to claim 3, The cylinder rack maintenance cart is moved to the front of another cylinder rack by the casters, and the cylinder rack maintenance cart is moved from the front of the other cylinder rack in a manner that sandwiches the other cylinder rack, and the top of the cylinder rack maintenance cart and the other cylinder rack are fixed by chains installed on the side of the other cylinder rack, making it possible to temporarily place the cylinder rack parts.

5. 2. The cylinder rack maintenance cart according to claim 1, The upper and lower parts of the cylinder rack maintenance cart have a sliding structure, and the sliding structure connects the upper and lower parts of the cylinder rack maintenance cart so that they can move vertically.

6. 2. The cylinder rack maintenance cart according to claim 1, A cylinder rack maintenance cart, characterized in that the jack is moved by a jack handle attached to the bottom of the cylinder rack maintenance cart.

7. 7. The cylinder rack maintenance cart according to claim 6, The upper part of the cylinder rack maintenance cart has the forks fixed to the front for fixing and lifting the central frame of the cylinder rack, and the vertical height of the upper surface of the forks is adjusted by the jack so that it is lower than the vertical height of the lower surface of the central frame.

8. 8. The cylinder rack maintenance cart according to claim 7, This cylinder rack maintenance cart is characterized in that, with the cylinder rack lifted by the forks, the central frame and the forks are fixed with guide pins, and the central frame is removed by pulling the entire cylinder rack maintenance cart out from the cylinder rack.

9. During maintenance of a cylinder rack that stores multiple cylinders, when removing the rack frame using a cylinder rack maintenance cart, Fix the cylinder rack part and the fork of the cylinder rack maintenance cart with a guide pin, and remove the cylinder rack part by pulling out the entire cylinder rack maintenance cart from the cylinder rack; A rack frame removal method using a cylinder rack maintenance cart, characterized in that the cylinder rack maintenance cart is moved to the front of another cylinder rack using casters, the cylinder rack maintenance cart is moved in front of the other cylinder rack in such a way that it sandwiches the other cylinder rack, and the top of the cylinder rack maintenance cart and the other cylinder rack are fixed together using chains installed on the side of the other cylinder rack, thereby temporarily placing the cylinder rack parts.

10. A method for carrying out a rack frame using the cylinder rack maintenance cart according to claim 9, comprising the steps of: The upper part of the cylinder rack maintenance cart is adjusted by a jack so that the vertical height of the upper surface of the fork is lower than the vertical height of the lower surface of the central frame, After adjustment with the jack, insert the fork from the front of the cylinder rack and adjust so that the fork is located at the bottom of the central frame, then operate the jack to move the upper part of the cylinder rack maintenance cart vertically upward and adjust until it is raised to a level where the upper surface of the fork touches the lower surface of the central frame, A rack frame removal method using a cylinder rack maintenance cart, characterized in that with the cylinder rack lifted by the forks, the central frame and the forks are fixed with guide pins, the entire cylinder rack maintenance cart is pulled out from the cylinder rack to remove the central frame, and after the central frame is removed, it is moved to the front of the other cylinder rack using the casters, and the cylinder rack maintenance cart is moved from the front of the other cylinder rack in a manner that sandwiches the other cylinder rack, and the upper part of the cylinder rack maintenance cart and the other cylinder rack are fixed with chains on the sides of the other cylinder rack, thereby temporarily placing the central frame.

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