JPS647022Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an overlay welding machine that regenerates worn parts of crawler type trucks (lower wheels) and carrier rollers (upper wheels) of bulldozers by overlay welding. This invention relates to a cooling device that prevents the roller body from overheating by spraying a jet of cooling medium onto the inner circumferential surface of the overlay weld of a cylindrical roller body taken out by disassembling a truck roller or carrier roller.

(Technical background of the invention and its problems) As shown in Fig. 2, the truck roller has a floating seal attached to a mounting plate 45 fixed with bolts 43 to threaded holes 42 on both ends of a cylindrical roller body 1 with a flange 1c. The shaft 46 is attached via the track link 47a, 47b.
is engaged with and guided by the outer periphery of the roller body 1.
Therefore, the engaging surfaces 1a and 1b on the outer periphery of the roller body 1 with the track links 47a and 47b are
Since it is worn as shown by a' and 1b', this worn part is regenerated by overlay welding.

By the way, when overlaying the roller body, if the roller body is left to overheat, the temperature difference between the overlay welding part at the top of the roller body during welding and other parts will cause the roller body to overheat. Cracks develop in the rollers, eventually causing the rollers to break. In particular, this problem has come into focus in recent years as hard rollers with excellent wear resistance have come into use. As a countermeasure for this, for example,
A system has been proposed in which the cooling medium is circulated using the lubricating oil passage hole of the truck roller, as shown in Japanese Patent No. 24616, but this method does not allow the cooling medium to flow from the left overlay weld to the right overlay weld. Since the temperature of the cooling medium gradually rises as it flows toward the weld, there is a difference in cooling temperature between the left overlay weld and the right overlay weld, resulting in the inconvenience that uniform welding cannot be performed.

(Structure of the invention) The present invention provides an overlay welding machine that performs welding while supplying a cooling medium into the track roller body, and includes end plates 2 and 3 that seal both sides of the roller body, and the one end plate 3. a cooling medium injection tube with a closed tip, inserted through the center of the roller body and positioned on the central axis of the roller body, and having a plurality of injection holes formed at locations corresponding to welding positions of the roller; A drainage introduction cover cylinder concentrically surrounding the penetration part of the injection pipe, having an introduction hole and fixed to the inner surface of the one end plate, and communicating with the cover cylinder and formed between the outer wall of the injection pipe. A rotary joint main body is provided with a discharge passage that is fixed to the end face plate 3 while fittingly supporting the base end of the injection pipe, and the rotary joint main body is fitted into a fitting recess formed on the end face of the joint main body. a support shaft that is equipped with a rotatable spindle and can move forward and backward in the axial direction; and a discharge that fits into the outer periphery of the rotary joint body and communicates with the discharge passage via a circumferential groove formed in the joint body. A support tube including a pipe and a supply pipe communicating with the pipe end of the injection pipe through an inflow hole formed in the joint body, and the center of the other end plate 2 are connected to a rotation drive mechanism. The roller body is supported by a spindle that effectively cools the area corresponding to the build-up weld on the surface of the roller body where welding is progressing, and cools it with a jet of cooling medium to cool the build-up weld on one side. This is to prevent a temperature difference from occurring between the overlay weld and the other overlay weld.

(Example) 1 is the truck roller main body, 2 and 3 are end plates,
4 is a mounting bolt. 5 is a rotation drive mechanism, and 6 is a rotation support mechanism. The rotation drive mechanism 5 fits a support spindle 8 that also serves as a roller rotation shaft into a fitting recess 7 formed in the center of the outer surface of the end plate 2, and connects the spindle 8 to a motor 1 via a reducer 9.
It is supported on a base 11 so as to be rotated by 0. Note that reference numeral 12 denotes a rotation transmitting member that also serves as an arch and is attached to a mounting member 13 that rotates together with the spindle 8 and comes into contact with the end surface of the roller body 1.

The rotation support mechanism 6 screws and fixes the open end of a cylindrical portion 15a of a rotation joint body 15 having a cylindrical portion 15a with one end open to a screw hole 14 bored in the center of the end plate 3, and A press spindle 17 which also serves as a roller rotation shaft is fitted into a fitting recess 16 formed on the other end surface of the main body 15, and a slite bearing 20 and The support shaft 19 is rotatably held via a sleeve 21, and is advanced or retreated via a gear mechanism or the like by rotating a handle (not shown), for example. By operating the support shaft 19 forward and locking the support shaft 19 in the forward position, the roller body 1 is rotatably held between the spindles 8 and 17. Reference numeral 22 denotes a cooling medium injection pipe with a closed tip, which extends upward from the central axis of the roller body 1 through the center of the end plate 3, that is, the cylindrical portion 15a of the rotary joint body 15. ing. The base end portion 22a is the cylindrical portion 1 of the rotary joint body 15.
It is screwed and fixed 23 deep inside 5a. Injection pipe 2
First and second ejection ports 24 and 25 are opened in the peripheral wall portion of the roller body 1 to eject a cooling medium toward the inner peripheral surfaces of the left and right built-up welded portions 1a and 1b, respectively. The second ejection ports 24 and 25 are each constituted by several ejection holes 24a and 25a formed at equal intervals (for example, 45° intervals) in the circumferential direction.
The first jet port 2 located on the closed end 22b side of the jet pipe 22
By making the opening area of the holes 24a of No. 4 smaller than the opening area of the holes 25a of the second jet opening 25 on the cooling medium supply side, the cooling medium from the first jet opening 24 and the second jet opening 25 is reduced. The amount of ejection is made approximately equal. The base end opening 22a of the injection pipe 22 communicates with the supply port 28 of the supply pipe 29 via an inflow hole 26a and a circumferential groove 26b formed in the rotary joint body 15 and penetrating in the radial direction. Furthermore, between the outer circumference of the injection pipe 22 and the inner circumference of the cylindrical part 15a of the rotary joint body 15,
A discharge path 30 is formed. 31a is a communication hole;
31b is connected to a circumferential groove and a discharge port 32 of the cylindrical body 27, and the discharge port 32 is connected to a cooling medium supply source (not shown) via a discharge pipe 33 and a heat dissipation device (not shown). The inner end opening of the discharge passage 30 is surrounded by a cover tube 34 welded 35 to the inner surface of the end plate 3, and the cooling medium inside the roller body 1 is surrounded by the cover tube 34.
The liquid is discharged to the discharge passage 30 through the introduction hole 36 opened at 4. Reference numerals 37 and 38 are welding torches for overlay welding on the overlay welding parts 1a and 1b at the top of the roller body 1, and are movable left and right and up and down, and the mutual interval can be set arbitrarily. There is. Note that liquids such as water and oil are used as the cooling medium.

1, when the motor 10 is started, the rotational force is transmitted to the roller body 1 via the reducer 9, the spindle 8, and the rotation transmission member 12, and the roller body 1 is transferred to the rotation joint body 15. , the welding torch 3 is rotated in one direction together with the spindle 17 and the supply pipe 22, and in this state, the welding torch 3 is attached to the left and right worn parts 1a' and 1b' located at the top of the roller body 1.
Overlay welding is performed in steps 7 and 38. that time,
Cooling water, for example, as a cooling medium is supplied from the pipe line 29 to the supply pipe 22 through the passages 26b and 26a of the rotary joint, and from the spout ports 24 and 25 of the supply pipe 22, the left and right walls of the top of the roller body 1 are supplied. Mold welding part 1a,
Cooling water jets 39 and 40 are sprayed onto the inner circumferential surface of the roller body 1b to cool the left and right overlay welds 1a and 1b, thereby preventing the roller body 1 from overheating. In addition, during this welding, it is necessary for the temperature of the roller body 1 to not be too low in order to perform good welding. Cooling water 41 that controls the temperature of the cooling water and is stored in the roller body 1
temperature is maintained at a predetermined temperature. The cooling water 41 discharged from the roller body 1 is sent to a heat radiating device via the discharge path 30, the passages 31a and 31b of the rotary joint, and the discharge pipe 33, and after being lowered to a low temperature by the heat radiating device, a cooling medium is supplied. recycled back to the source and reused.
During this welding work, the temperature and storage amount of the cooling medium 41 stored in the roller body 1 are controlled by the supply pipe 22.
The temperature and amount of the cooling medium supplied by the roller body 1 and the temperature and amount of the cooling medium discharged from the roller body 1 are maintained substantially constant. Note that the temperature and amount of the cooling medium supplied will vary depending on the type of roller body, welding conditions, cooling medium, etc., but when water is used as the cooling medium in the above embodiment device, the temperature and amount of the cooling medium supplied will vary depending on the type of roller body, welding conditions, cooling medium, etc. Supply rate is 19℃~35℃, 15/min,
Temperature and amount of discharged cooling medium between 35℃ and 51℃
Good results were obtained at 15/min at ℃.

Furthermore, the present invention allows for free rotation between the roller body 1 and the rotary joint body 15 in the above embodiment, or allows for free rotation between the rotary joint body 15 and the supply pipe 22. It is also possible to implement a configuration in which the supply pipe 22 is fixed and the roller body is rotated around the axis of the supply pipe. In this case, the first and second spout 2
Holes 24a and 25a constituting holes 4 and 25, respectively, are
It is not necessary to arrange the supply pipe all around the circumference, and the left and right overlay welds 1a and 1b at the top of the roller body 1
They may be arranged in a fan shape on the upper circumferential wall of the supply pipe facing the supply pipe.

(Effect of the invention) Since the present invention has the above-mentioned configuration, welding is carried out by the jets 39 and 40 of the cooling medium sprayed onto the inner circumferential surfaces of the left and right overlay weld parts 1a and 1b at the top of the roller body 1. By effectively cooling the overlay welding part at the top of the roller body 1 while welding is in progress, the temperature difference between the welding welding at the top of the roller body in progress and other parts can be reduced. It can prevent crack failure due to temperature difference. Moreover, since the left overlay weld 1a and the right overlay weld 1b are simultaneously cooled with a cooling medium of the same temperature, there is no difference in the cooling temperature of these two welds, and both the overlay welds 1a, 1b are cooled simultaneously.
can be welded homogeneously. In this case, the first spout 24
By making the amount of cooling medium ejected from the second ejection ports 25 approximately equal, a more uniform cooling effect can be expected.

Furthermore, in the present invention, if the temperature of the cooling medium 41 stored in the roller body 1 is maintained at a predetermined temperature, the temperature of the roller body 1 can be maintained at a substantially constant temperature, and the roller body temperature will become too low. This enables continuous, homogeneous welding around the entire circumference of the roller body.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a truck roller in an assembled state. 1... Roller body, 2, 3... End plate, 5,
6... Rotation holding mechanism, 22... Cooling medium supply pipe,
24, 25...first and second jet ports, 30...discharge path, 33...discharge pipe.

Claims (1)

[Scope of utility model registration request] In an overlay welding machine that performs welding while supplying a cooling medium into the track roller body, the roller body passes through the center of the end plates 2 and 3 that seal both sides of the roller body and the one end plate 3. A cooling medium injection tube with a closed tip, which is inserted so as to be positioned on the central axis of the The injection pipe comprises a drainage introduction cover cylinder which surrounds and has an introduction hole and is fixed to the inner surface of the one end plate, and a discharge passage which is communicated with the cover cylinder and is formed between an outer wall of the injection pipe. The rotary joint main body is fixed to the end plate 3 by fitting and supporting the proximal end of the pipe, and the rotary joint main body is provided with a spindle that is rotatable by fitting into a fitting recess formed in the end face of the joint main body, and a shaft. a support shaft that can move forward and backward in the direction; a discharge pipe that fits on the outer periphery of the rotary joint body and communicates with the discharge passage through a circumferential groove formed in the joint body; and a pipe end of the injection pipe; a support cylinder having a supply pipe communicating through an inflow hole formed in the joint body; and a truck roller in which the center of the other end plate 2 is supported by a spindle connected to a rotation drive mechanism. Cooling device for overlay welding machine.