JPH0615938U - Tube bundle extraction / insertion device for horizontal multitubular heat exchanger - Google Patents

Abstract

(57) [Summary] [Construction] The trolley body 10 is provided with a tube bundle drive mechanism 24 provided thereon, and a trolley fixing mechanism 16 for fixing the trolley body 10 to the heat exchanger A. Cart fixing mechanism 16
Is a pair of connecting rods that are connected to both sides of the front end of the bogie main body 10 and that can change the left and right separation amount of the front end, a pair of holding bodies 48 and 54 that sandwich the saddle portion S from the front and rear, and left and right ends of the holding body. The bolts 52 are respectively connected and fixed. Each of the connecting rods and the holding body 48 are connected so that the amount of lateral separation between the connecting portions can be changed. [Effect] The tube bundle can be pulled out and inserted without affecting the support structure of the heat exchanger. Further, by adjusting the connecting portion between the connecting rod and the holding body to the left and right, it is possible to easily deal with saddle portions of various sizes and prevent loosening of the fastening means due to bending of the holding body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tube bundle extracting / inserting device for inserting and removing a tube bundle formed by bundling a large number of heat transfer tubes in parallel into and out of a cylindrical shell of a horizontal multitubular heat exchanger installed horizontally.

[0002]

[Prior art]

 In general petroleum refining plants and chemical plants, horizontal horizontal tubular heat exchangers are often installed in one place in groups of several or more. This type of horizontal multi-tube heat exchanger is sealed by inserting a tube bundle in which a number of heat transfer tubes are penetrated and fixed in parallel with a disk-shaped tube plate and baffle plate into a cylindrical shell. The total length of the tube bundle is about 6 to 16 m, and the weight may reach 10 tons.

By the way, in the plant as described above, it is necessary to periodically pull out the tube bundle from the shell, convey it to a predetermined place such as a washing place for maintenance and inspection, and then insert it again into the shell. In such a case, conventionally, a method of using two crane trucks has been adopted as shown in FIG.

In this method, first, the lid of the shell A of the heat exchanger is removed, then one mobile crane 1 is arranged in front of the shell A and the other mobile crane 2 is arranged laterally of the shell A. The wire 3 of the first mobile crane 1 is connected to the tube plate C at the front end of the pipe bundle T via the pulleys 4 and 5, while the front end of the pipe bundle T is suspended by the second mobile crane 2. The wire 3 of the first mobile crane 1 is wound up and the tube bundle T is pulled out. After pulling out the tube bundle T to some extent, the position where the second crane vehicle 2 is hung is shifted backward, and this operation is repeated to pull out the tube bundle T completely.

The tube bundle T that has been pulled out is once lowered to the ground, the crane trucks 1 and 2 are evacuated, and transported to a work place by a transport truck. Then, after inspection and cleaning are performed here, the tube bundle T is again inserted into the shell A by the procedure reverse to the above, and the work is completed.

When the tube bundle T is pulled out or inserted, the flange F of the shell opening is connected to the first crane vehicle 1 via a connecting jig (not shown) so that the pulling force can be supported. In some cases.

[0007]

[Problems to be solved by the device]

 However, in the method as described above, it is difficult to operate the crane vehicles 1 and 2 in cooperation with each other, and requires a high degree of skill, and when the tube bundle T and the shell A are interfered with each other at the time of withdrawal or insertion, damage is likely to be caused to each part, and work is required. Is dangerous. In addition, when the flange F is used for fixing a crane vehicle, the flange F often deforms during the work.

Therefore, recently, it has been considered to use a working vehicle (tube bundle extracting / inserting device) in which a tube bundle extracting / inserting mechanism is provided on a movable carriage. If such a working vehicle is placed in front of the heat exchanger with its center line aligned and the pulling and inserting mechanism is activated to move the tube bundle into and out of the shell, workability can be improved and damage to the tube bundle, etc. can be prevented. You can

However, in this case, how to connect and fix the dolly and the shell A is an important problem, and if the flange F of the shell A is used for fixing the dolly, the flange as described above is used. Damage to F is unavoidable. It is also conceivable to connect the dolly to the foundation B of the heat exchanger via a jig, but a large bending moment is generated, which may deform the saddle S connecting the foundation B and the shell A. is there. Further, since the base B and the saddle portion S have various sizes depending on the type of the heat exchanger, the connecting means must be able to support a wide range of heat exchanger sizes.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a tube bundle extracting / inserting device that can perform tube bundle extraction / insertion work without damaging the heat exchanger and that is highly versatile. I am trying.

[0011]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a traveling bogie body, a tube bundle driving mechanism that is provided on the bogie body and that can pull or / and press the end portion of the tube bundle in the axial direction of the tube bundle, and the bogie body. Is fixed to the horizontal shell-and-tube heat exchanger, and the bogie fixing mechanism has a rear end connected to both sides of the front end of the bogie body and left and right sides between the front ends. A pair of connecting rods, the distances of which can be changed, a pair of holding bodies which sandwich the saddle part from the front and the rear and which are longer than the saddle part in the left and right, and which connect the left and right ends of the holding bodies, respectively. Fastening means for fixing, and each of the front end portions of the connecting rods and the holding body on the trolley body side are connected so as to be able to change the left-right separation amount between the front ends of the connecting rods. Is characterized by.

[0012]

[Action]

 In the device of the present invention, by connecting the saddle part that connects the shell and the foundation with the bogie body by the bogie fixing mechanism, the saddle part close to the shell can be used as a support point and a reaction force can be applied almost horizontally. The tube bundle can be pulled out (or inserted) without applying a large bending moment to the shell support structure. Also, since the saddle part is sandwiched from the front and back by the holding body that is longer to the left and right than the saddle part, and the left and right ends of these holding bodies are connected and fixed by the fastening means, respectively, it is possible to easily respond to the size change of the saddle part. By adjusting the positions of the front and rear ends of the connecting rod and the holding body to the left and right according to the left and right width of the saddle, it is possible to prevent the fastening means from loosening or being damaged due to the bending of the holding body.

[0013]

【Example】

 An embodiment of a tube bundle extracting / inserting device for a horizontal multitubular heat exchanger according to the present invention will be described below with reference to FIGS. 1 to 3. 1 is an overall side view of the tube bundle extracting / inserting device, FIG. 2 is a side view of a bogie fixing mechanism, and FIG. 3 is a plan view of the bogie fixing mechanism.

In FIG. 1, reference numeral 10 is a rectangular trolley body that is long in the front-rear direction (left-right direction in FIG. 1). The trolley body 10 is provided with front and rear wheels 12 so that all four wheels can be steered and driven by a drive mechanism (not shown). Outriggers 14 are vertically attached to the bogie body 10 in the vicinity of the wheels 12 and in the center of the bogie. These outriggers 14 are for fixing the bogie main body 10 by protruding the legs 14A downward and lifting the wheels 14 from the ground, and FIG. 1 shows the bogie fixed state. Further, a carriage fixing mechanism 16 for connecting and fixing the carriage main body 10 to a saddle portion S supporting the shell A is provided at the front end of the carriage main body 10. This will be described later.

A pair of rails 18 are attached to the upper surface of the trolley body 10 in the front-rear direction, and a plurality of (three) sliders 22 can be moved back and forth along the rails 18. The slider 22 supports the extracted tube bundle T, and in any case, its article support height can be adjusted arbitrarily.

A wire winding mechanism (tube bundle driving mechanism) 24 for winding the wire 26 is installed at the rear end of the carriage body 10. By connecting the front end of the wire 26 to the tube plate C of the tube bundle T, You can pull T. Although not shown, the carriage body 10 is also provided with a tube bundle insertion mechanism for inserting the tube bundle T into the shell A. On the other hand, a chain block 28 for suspending the lid of the shell A is provided at the front part of the carriage main body 10.

Next, the periphery of the carriage fixing mechanism 16 will be described with reference to FIGS. 2 and 3. A U-shaped notch 10A is formed in the center of the front end of the carriage body 10 so that interference with the pipes and protrusions can be avoided when the heat exchanger is approached. A plurality of (two in the drawing) mounting holes 30 are formed vertically at the front ends of the bogies on both sides of the notch 10A and are spaced at equal intervals in the front-rear direction. 32 is vertically and removably inserted. A screw is cut on the outer circumference of each of the pawls 32, and the threaded portion is screwed into a nut 34 mounted on the bogie body 10. When each nut 34 is turned, the height of each pawl 32 can be adjusted. .

A boss 36 is attached to an upper portion of each pole 32 so as to be rotatable around the pole, and a rod 38 is fixed to the boss 36 by extending substantially horizontally. The front end of each rod 38 is threaded, and these threaded parts are respectively screwed into one end of a turnbuckle 40 and inserted. Further, the threaded portion of another rod 42 is screwed into the other end of each turnbuckle 40, and the threaded portions of the rods 38 and 42 are reversely threaded. Accordingly, when the turnbuckle 40 is rotated using a tool, the connection length of each rod 38, 42 can be finely adjusted. As described above, in this embodiment, the rods 38 and 42 and the turnbuckle 40 form a connecting rod.

A widened support portion 44 is formed at the front end of the rod 42. On the other hand, at substantially the same height as the rod 42, the saddle portion S supporting the shell A is provided with a pair of holding bodies 48 and 54 which horizontally sandwich the saddle portion S from the front and back. The holding bodies 48, 54 are longer in the left-right direction and have the same length as any saddle part S to be used by the present apparatus, and the holding bodies 48, 54 are U-shaped in cross section. The sandwiching bodies 48, 54 are fixed to each other by a bolt 52 and a nut 56 (fastening means) penetrating both end portions of the saddle portion S in the front-rear direction in a state where the lateral center of the saddle portion is aligned.

As shown in FIG. 3, a plurality of (three in the figure) mounting holes 50 are vertically formed in the left and right side plate portions of the sandwiching body 48, as shown in FIG. There is. Then, connecting bolts 46 are vertically inserted into any one of a pair of mounting holes 50 at symmetrical positions, and the supporting portions 44 of the rod 42 are horizontally rotatably supported by the connecting bolts 46.

In order to use the tube bundle withdrawing / inserting device having the above-described structure, first, the bogie body 10 is run with the wheels 12 grounded, and the center lines of the bogie bodies 10 are aligned in front of the shell A and then stopped. The legs 14A of each outrigger 14 are lowered, and the carriage main body 10 is lifted and fixed to the ground.

The holding bodies 48, 54 are attached in advance to the upper end side of the saddle portion S that is as close to the shell A as possible, and are fixed with bolts 52 and nuts 56.

Depending on the distance between the trolley body 10 and the saddle portion S, one of the mounting holes 30 at the front end of the trolley is selected, and the pole 32 is replaced if necessary. Further, the height of the boss 36 is adjusted to the holding body 48 by the pin 34.

Next, a pair of mounting holes 50 of the sandwiching body 48 corresponding to the left and right width of the saddle portion S are selected, and bolts 46 are inserted into these mounting holes 50 to connect the rod 42 to the sandwiching body 48. Further, by turning the turnbuckle 40 and finely adjusting the connecting length of the rods 38 and 42, the connecting work between the carriage main body 10 and the saddle part S is completed.

Next, the lid of the shell A is removed using the chain block 28, and the slider 22 is moved to the front end side of the rail 18. The wire 26 is connected to the exposed end of the tube bundle T via a connecting tool, and the winding mechanism 24 is operated to gradually pull out the tube bundle T. At this time, although the initial pull-out resistance of the tube bundle T is large due to the adhered substances, the dolly body 10 and the saddle part S are firmly connected through the dolly fixing mechanism 16, and a sufficiently large pull-out force can be applied. it can.

As the tube bundle T is pulled out, the operation of moving the slider 22 in a stepwise manner to support the tube bundle T evenly is repeated to pull out the tube bundle T completely from the shell A. After that, the trolley fixing mechanism is removed, the trolley body 10 is lowered by the outrigger 14, and the trolley body 10 is moved to the washing place to perform necessary inspection and washing. The washed tube bundle T may be inserted into the shell A after the carriage main body 10 is again aligned with the shell A in the same manner as described above, and then the tube bundle insertion mechanism is operated.

According to the tube bundle extracting / inserting device having the above structure, the following excellent effects can be obtained.

By connecting the saddle part S and the bogie body 10 with the bogie fixing mechanism 16, the saddle part S near the axis of the shell A can be used as a support point to apply a reaction force substantially horizontally. Therefore, the tube bundle T can be pulled out or inserted without generating a large bending moment in the shell support structure.

The saddle portion S is sandwiched from the front and back by sandwiching bodies 48 and 54 that are sufficiently longer to the left and right than the saddle portion S, and the left and right ends of these sandwiching bodies 48 and 54 are connected and fixed by bolts 52, respectively. Therefore, it is possible to easily accommodate saddle portions S having different widths and thicknesses, and by selecting the mounting hole 50, the connecting portion between the front end portion of the rod 42 and the sandwiching body 48 can be adjusted according to the width of the saddle portion S. Since the position can be adjusted to the left and right, it is possible to prevent the clamps 48 and 54 from bending, and to prevent the bolts 52 from loosening due to this type of bending. On the other hand, for example, when the width of the saddle portion S is small and the rod 42 is connected to the outermost sides of the sandwiching bodies 48 and 54, the bolts 52 are bent due to the bending of the sandwiching bodies 48 and 54 when the tube bundle is pulled out. May loosen. On the contrary, when the tube bundle is inserted, a large pulling force is applied to the bolt 52, which may damage the bolt 52.

As means for adjusting the connection length by the bogie fixing mechanism 16, rough adjustment by selecting the mounting hole 30 at the front end of the bogie and fine adjustment by rotating the turnbuckle 40 are used together, so workability is good. is there.

The present invention is not limited to the above-described embodiment, and it goes without saying that the configuration may be appropriately changed as necessary, and the structure of each connecting portion is well known in the art. You may replace with the structure.

[0032]

[Effect of device]

 As described above, in the tube bundle extracting / inserting device for the horizontal multitubular heat exchanger according to the present invention, the bogie fixing mechanism connects the saddle part that connects the shell and the foundation to the bogie main body, so that it is close to the shell. Since the reaction force can be applied almost horizontally using the saddle as a supporting point, it is possible to pull out and insert the tube bundle without generating a large bending moment in the shell supporting structure.

Further, since the saddle portion is sandwiched from the front and rear by the holding body which is longer to the left and right than the saddle portion, and the left and right ends of these holding bodies are respectively connected and fixed by the fastening means, it is possible to change the dimension of the saddle portion. Not only can this be done easily, but by adjusting the left and right positions of the connecting points between the front ends of the connecting rods and the holding body in accordance with the width of the saddle part, loosening of the fastening means due to bending of the holding body can be prevented. It can be prevented and work reliability and safety are enhanced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a tube bundle extracting / inserting device of a horizontal multitubular heat exchanger according to the present invention.

FIG. 2 is a side view showing the vicinity of a carriage fixing mechanism of the device.

FIG. 3 is a plan view of the same portion.

FIG. 4 is an explanatory diagram of a conventional tube bundle withdrawing and inserting operation.

[Explanation of symbols]

 A shell S saddle part B foundation T tube bundle 10 bogie body 12 wheels 14 outrigger 16 bogie fixing mechanism 24 wire winding mechanism (tube bundle drive mechanism) 30 mounting hole 32 pole 38, 42 rod (part of connecting rod) 40 turnbuckle ( Part of the connecting rod) 48, 54 Clamping body 50 Mounting hole for adjusting the rod connecting width 52 Bolt (fastening means)

Claims (1)

[Scope of utility model registration request] 1. A tube bundle extraction for extracting or inserting a tube bundle formed by bundling a plurality of heat transfer tubes in parallel from a cylindrical shell of a horizontal multitubular heat exchanger installed horizontally on a foundation via a saddle portion. An insertion device, which is a traverse main body, a tube bundle drive mechanism provided on the main body of the carriage for pulling and / or pressing the end portion of the tube bundle in the axial direction of the tube bundle, and the horizontal main body of the carriage body. A bogie fixing mechanism that can be fixed to the heat exchanger, wherein the bogie fixing mechanism is a pair in which the rear ends are connected to both sides of the front end of the bogie body and the left-right separation amount between the front ends can be changed. A connecting rod, a pair of sandwiching members that are arranged sandwiching the saddle part from the front and rear and are longer than the saddle part in the left and right, and fastening means that connect and fix both left and right end parts of these sandwiching bodies, Of each front end of the connecting rod A tube bundle withdrawing / inserting device for a horizontal multi-tube heat exchanger, wherein each of the holding bodies on the side of the bogie main body is connected so as to be able to change the left / right separation amount between the front ends of the connecting rods. .