KR20080104543A - Power transmission for pipe bending machine - Google Patents

Abstract

A powertrain of the pipe banding machine is provided to control the bending force and the bending speed. A powertrain of the pipe banding machine comprises a drive motor(36); a reducer(37) in which the axis of rotation(38) is equipped so that it deliver the power of the drive motor to outside while being connected to the drive motor; a driving gear group(40) consisting of a plurality of driving gears which has the different diameter while the axis of rotation is installed in order to be idled on the axis of rotation of reducer; an axis(46) of changing speed which is connected to the axis of rotation of reducer and selectively is engaged in one driving gear and delivers the rotation power of reducer to the engaged driving gear among the driving gear group; an elevating mean is connected to the axis of changing speed so that the axis of changing speed be engaged in one driving gear among a plurality of driving gears; and a transmission gear group delivering transferred rotation power from the driving gear group and installed on the axis of rotation(32) of the banding die(31); and a controller is connected to the drive motor and the elevating mean.

Description

Power transmission device for pipe bending machine

1 is a schematic perspective view showing a conventional pipe bending machine

Figure 2 is a partial plan view showing the main part of Figure 1

Figure 3 is a schematic partial cross-sectional view showing another embodiment of a conventional pipe bending machine

Figure 4 is a schematic view showing a power transmission device of the pipe bending machine of the present invention

5a and 5b are partial cross-sectional views showing the operating state of FIG.

6 and 7 are schematic cross-sectional views showing other embodiments of the present invention.

* Description of the symbols for the main parts of the drawings *

30: table 31: bending die

32,38,91: rotating shaft 33,70,110: electric gear group

34,71: First electric gear 35,72: Second electric gear

36: drive motor 37,90: reducer

39,92: Spline groove 40,60,100: Drive gear group

41,61: First drive gear 42,62: First spline groove

43,63: 2nd drive gear 44,64: 2nd spline groove

46,80,120: Shifting shaft 47,81: First spline part

48,82,121: 2nd spline part 50: hydraulic cylinder

51: cylinder rod 52: clamp

53: upper clamp 54: lower clamp

55: fixing bracket 56: controller

65: third drive gear 66: third spline groove

73: third electric gear

The present invention relates to a pipe bending machine, and more particularly, to a power transmission device for a pipe bending machine that can adjust the bending speed and increase the bending force.

As is well known, pipe bending machines are devices for bending pipes at an angle. 1 and 2, the pipe bending machine is clamped by supporting the supply unit 2 formed to supply the pipe 1 at a speed suitable for bending and the pipe 1 supplied from the supply unit 2, as shown in FIGS. It consists of a bending part 7 which bends while rotating in the state, and the drive part 15 which drives the bending part 7.

The supply part 2 is provided on the table and guides the cylinder 3 which supplies the pipe 1 to the bending part 7 side, and the pipe 1 which is provided on the table and supplied to the bending part 7 side. It consists of a fixed interval 4, a mandrel bar 5 coupled to the pipe 1, and a feed roller 6 which is provided on the table and guides the pipe 1 to be transferred to the bending part 7 side.

The bending portion 7 is a portion for bending the pipe 1 supplied from the supply portion 2 by a predetermined angle, which is a central bending die 8 and a clamp die provided at one side of the bending die 8. 9), another clamp die 10 facing the clamp die 9 and holding a pipe 1 positioned therebetween, and a clamp die cylinder 11 connected to and actuated by the clamp die 9; And a rotary table 12 on which the clamp dies 9 and 10 are installed and the clamp dies 9 and 10 are rotated about the bending die 8, and installed on one side of the clamp die 9. Press die 13 and a press die cylinder 14 connected to the press die 13 to operate it.

The drive unit 15 includes a drive motor 16 connected to the bending die 8 and the rotary table 12 to rotate them, a drive gear 17 connected to the center of rotation of the drive motor 16, and It consists of an electric gear 18 meshed with the drive gear 17 and an electric motor 19 connected to the electric gear 18 to improve the output of the drive motor 16.

By the way, such a pipe bending machine, the electric gear 18 and the electric motor 19 is further installed to improve the output of the drive motor 16, the electric gear 18 and the motor 19 is a pipe to be bent According to the kind of (1), the output of the drive motor 16 and its rotation speed could not be changed suitably. That is, when the diameter of the pipe 1 is relatively small or the strength of the pipe 1 is relatively weak, a large force enhanced as in the prior art is not necessary, and in this case, the rotation thereof instead of improving the output of the driving motor 16 is required. Increasing the speed will increase the working efficiency. However, the conventional pipe banding machine is rotated at a constant magnitude of rotational force and a constant magnitude of rotation regardless of the type of pipe 1, so that the power usage is increased as the rotational strength is increased, but the work efficiency is not improved.

In order to solve this problem, the applicant has developed a pipe bending machine as shown in FIG. The pipe bending machine is connected to the banding die 20, the drive motor 21 for rotating them, and a plurality of drive gears having different diameters which are installed on the rotation shaft 22 of the drive motor 21 and rotated therewith. (23), an electric gear 24 that is selectively engaged with the drive gears 23, an electric motor 25 connected to the electric gear 24 to rotate it, and the electric motor 25 Transmission means 26 is connected to adjust the electric gear 24 to be engaged with any one of the plurality of drive gears 23 of the drive gear (23).

Here, the transmission means 26 is connected to the electric motor 25, the first transfer cylinder 27 for advancing forward and backward, the first transfer cylinder 27 and the second motor 25 is installed to lift the second It consists of a transfer cylinder 28. The shifting means 26 adjusts the electric gear 24 to be engaged with one of the plurality of drive gears 23, thereby changing its bending force and rotational speed according to the bending operation state. Maximize your work efficiency.

However, such a conventional pipe bending machine includes a first transfer cylinder 27 for advancing and retracting the electric gear 24 to adjust the rotational speed of the bending die 20, and an electric gear including the first transfer cylinder 27. A second transfer cylinder 28 for elevating (24) is to be provided. Therefore, two expensive hydraulic cylinders are used to shift the bending die 20, thereby increasing the manufacturing cost.

In addition, such a conventional pipe banding machine operates the first transfer cylinder 27 to shift the electric gear 24 forward and backward, and then operates the second transfer cylinder 28 to raise and lower the electric gear 24 for the shift operation. On the contrary, the second transfer cylinder 28 must be operated first to elevate the electric gear 24, and then the first transfer cylinder 27 must be operated to move the electric gear 24 forward and backward. Accordingly, the shift of the pipe banding machine is delayed by the shift time because the two first transfer cylinders 27 and the second transfer cylinders 28 are operated to perform the shift, thereby delaying the bending work time.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a power transmission device of a pipe banding machine to adjust the bending speed and the bending force of the pipe.

Another object of the present invention is to provide a power transmission device of a pipe banding machine which allows the number of parts to be reduced.

Still another object of the present invention is to provide a power transmission device for a pipe banding machine that can shorten a shifting time.

The power transmission device of the pipe banding machine of the present invention for achieving the above object, the power transmission device of the pipe banding machine is connected to the banding die installed on the table to rotate it, a drive motor; A reducer connected to the drive motor and provided with a rotating shaft to transmit power of the drive motor to the outside; A drive gear group including a plurality of drive gears installed to be idle on the rotating shaft of the reducer and having different diameters; A transmission shaft connected to the rotation shaft of the reducer and selectively engaged with any one of the drive gear groups to transfer the rotational power of the reducer to the matched drive gear; Elevating means connected to the transmission shaft so that the transmission shaft is engaged with any one of the plurality of driving gears, and elevating the transmission shaft; An electric gear group installed on the rotating shaft of the banding die, the electric gear group including a plurality of electric gears to be engaged with the plurality of driving gears, respectively, and transmitting the rotating power transmitted from the driving gear group to the rotating shaft of the banding die; It is characterized in that it is connected to the drive motor and the lifting means consisting of a controller for controlling them.

Another characteristic of the power transmission device of the pipe bending machine of this invention is that the rotation shaft of the said speed reducer is provided with the spline groove around the inner peripheral surface.

Another characteristic of the power transmission device of the pipe bending machine of the present invention is that the drive gear group includes a first drive gear having a first spline groove formed around an inner circumferential surface, and a second drive gear having a second spline groove formed around an inner circumferential surface.

Another feature of the power transmission device of the pipe bending machine of the present invention, wherein the transmission shaft, the first spline portion is engaged with the spline groove of the reducer so that the rotational power of the reducer, and the rotational power of the reducer A second spline part is selectively engaged with the first spline groove of the first drive gear or the second spline groove of the second drive gear so as to be transmitted to the first drive gear or the second drive gear.

A further feature of the power transmission device of the pipe bending machine of the present invention is that the lifting means comprises a hydraulic cylinder.

In the present invention, the second spline portion of the shift shaft is selectively engaged with the first driving gear and the second driving gear, thereby adjusting the rotational force and the rotational speed of the reducer. That is, when the hydraulic cylinder is operated and the second spline part of the transmission shaft is engaged with the first drive gear of the drive gear group, the rotational speed of the bending die is decreased, but the rotational force is increased, and thus it is very suitable for bending a pipe requiring a large bending force. Do. On the other hand, when the second spline part of the shift shaft is engaged with the second drive gear by the hydraulic cylinder, the rotational force of the bending die is decreased, but the rotational speed thereof is increased, thereby returning quickly when bending a pipe that does not require a large bending force or after bending. Very suitable for doing The pipe bending machine of the present invention can change the bending force and the rotational speed according to the thickness and diameter of the pipe, and the bending work state can maximize the working efficiency.

In addition, when the hydraulic cylinder is operated by the controller, the cylinder rod is lifted to raise and lower the shift shaft. Accordingly, the second spline part of the shift shaft is engaged with the first spline groove of the first drive gear or is connected to the second spline groove of the second drive gear. Are matched. Therefore, the rotation speed of the bending die is shifted by a relatively simple operation in which the cylinder rod of the hydraulic cylinder is elevated, thereby reducing the bending time.

In addition, since the shifting of the bending die is performed by one hydraulic cylinder, a hydraulic cylinder, which is an expensive part, is used at a minimum, thereby reducing the overall cost of the pipe banding machine.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 4 is a schematic view showing a power transmission device of the pipe bending machine of the present invention, Figures 5a and 5b is a partial cross-sectional view showing the operating state of FIG. In the power transmission device of the pipe bending machine, a banding die 31 is provided on the table 30, and a rotary shaft 32 is connected to the banding die 31 under the table 30. The rotary shaft 32 is provided with an electric gear group 33, which is a large diameter of the first electric gear (34), and the second of the smaller diameter than that provided above the first electric gear (34) It is made of an electric gear (35).

One side of the bending die 31 and the electric gear group 33 is provided with components for transmitting rotational power thereto. That is, the drive motor 36 is provided below the table 30, and the reduction motor 37 is connected to this drive motor 36. As shown in FIG. The reduction gear 37 is provided with a rotating shaft 38 to reduce the rotational speed of the drive motor 36 and transmit the reduced rotational power to the outside. The rotary shaft 38 is formed with a spline groove 39 around the inner circumferential surface, and the first spline portion 47 of the shift shaft 46 to be described later is engaged with the spline groove 39.

On the rotary shaft 38 of the reducer 37, a drive gear group 40 composed of a plurality of drive gears is installed to idle. The drive gear group 40 includes a first drive gear 41 installed to idle on the rotary shaft 38 of the reduction gear 37 and a second drive gear 43 installed to idle on the first drive gear 41. . A first spline groove 42 is formed around the inner circumferential surface of the first drive gear 41 so as to be engaged with the second spline portion 48 of the shift shaft 46 to be described later, and an inner circumferential surface of the second drive gear 43. The second spline groove 44 is formed at the circumference thereof so as to be engaged with the second spline portion 48 of the shift shaft 46.

The shift shaft 46 is connected to the rotation shaft 38 of the reduction gear 37 and is selectively engaged with any one of the drive gear groups 40 to transfer the rotational power of the reduction gear 37 to the engaged drive gear. This shift shaft 46, the first spline portion 47 is engaged with the spline groove 39 of the reducer 37 so that the rotational power of the reducer 37, and the rotational power of the reduced reducer 37 is transmitted. To the first spline groove 42 of the first drive gear 41 or the second spline groove 44 of the second drive gear 43 so as to be transmitted to the first drive gear 41 or the second drive gear 43. A second spline portion 48 is provided that is selectively engaged.

On the upper portion of the shift shaft 46, the shift shaft 46 is connected to the shift shaft 46 so as to be engaged with any one of the plurality of drive gears, and a lifting means is provided to lift the lift shaft. The hydraulic cylinder 50 is suitable. That is, the fixing bracket 55 is installed on the table 30 and one side of the hydraulic cylinder 50 is fixed to the fixing bracket 55. And the cylinder rod 51 of the hydraulic cylinder 50 is fixed to the upper end of the transmission shaft 46.

Here, the lower end of the cylinder rod 51 and the upper end of the shift shaft 46 may be fixed by the clamp 52. That is, the lower flange of the cylinder rod 51 and the upper flange of the shift shaft 46 are brought into contact with each other, and the upper clamp 53 and the lower clamp 54 are fitted to the upper and lower sides thereof, and then coupled to each other.

The fixing of the lower end of the cylinder rod 51 and the upper end of the shift shaft 46, as well as the fixing by the clamp 52 can be fixed by a person skilled in the art using a variety of methods within the scope of the present invention. will be.

The controller 56 is connected to the above-described driving motor 36 and the hydraulic cylinder 50 to control them.

The power transmission device of the pipe bending machine of the present invention having such a configuration operates the hydraulic cylinder 50 serving as the lifting means by operating the controller 56 when the pipe is gripped by the bending die 31. When the cylinder rod 51 of the hydraulic cylinder 50 is lowered as shown in FIG. 5A, the first spline portion 47 of the transmission shaft 46 moves the spline groove 39 of the rotation shaft 38 of the reduction gear 37. The second spline portion 48 is engaged with the first spline groove 42 of the first drive gear 41.

In this state, when the driving motor 36 is driven, the speed reducer 37 connected thereto is driven, thereby rotating the rotation shaft 38 of the speed reducer 37. When the rotation shaft 38 of the reducer 37 is rotated, the transmission shaft 46 splined by the first spline part 47 is rotated and thus the first drive gear splined to the second spline part 48 ( 41) is rotated.

When the first driving gear 41 is rotated, the first electric gear 34 meshed with the first driving gear 41 is rotated, thereby rotating the rotating shaft 32 and the bending die 31. Here, since the diameter of the first electric gear 34 is larger than the diameter of the first driving gear 41, the rotation shaft 32 of the bending die 31 is relatively low-speed rotated, and the rotational force thereof increases.

On the other hand, when the hydraulic cylinder 50 is operated by the controller 56 and the cylinder rod 51 is raised as shown in FIG. 5B, the first spline portion 47 of the speed change shaft 46 moves to the speed reducer 37. The second spline portion 48 is engaged with the second spline groove 44 of the second drive gear 43 in the state in which the spline groove 39 of the rotary shaft 38 is engaged.

In this state, when the driving motor 36 is driven, the speed reducer 37 connected thereto is driven, thereby rotating the rotation shaft 38 of the speed reducer 37. When the rotation shaft 38 of the reducer 37 rotates, the shift shaft 46 splined by the first spline part 47 rotates, and accordingly, the second drive gear splined to the second spline part 48 ( 43) is rotated.

When the second driving gear 43 is rotated, the second electric gear 35 meshed with the second driving gear 43 is rotated, thereby rotating the rotating shaft 32 and the bending die 31. Since the diameter of the second electric gear 35 is smaller than the diameter of the second drive gear 43, the rotating shaft 32 of the bending die 31 is relatively rotated at a high speed, and the rotational force thereof is reduced accordingly.

In the pipe bending machine of the present invention, since the second spline portion 48 of the transmission shaft 46 is selectively engaged with the first driving gear 41 and the second driving gear 43 by the hydraulic cylinder 50, The bending force and the rotation speed can be changed depending on the thickness and diameter of the and the bending work condition.

That is, when the second spline portion 48 of the shift shaft 46 is engaged with the first drive gear 41 of the drive gear group 40, the rotation speed of the bending die 31 is decreased, but the rotation force is doubled, and accordingly, It is very suitable for bending pipes that require large bending force. On the other hand, when the second spline portion 48 of the transmission shaft 46 is engaged with the second drive gear 43 of the drive gear group 40, the rotational force of the bending die 31 is reduced but the rotational speed is doubled. This makes it ideal for bending pipes that do not require large bending forces or for fast return after bending.

Here, the hydraulic cylinder 50 and the transmission shaft 46 connected thereto may be automatically operated according to a program input to the controller 56, for example, when the bending die 31 requires a high output, that is, When a certain pressure or more acts on the driving motor 36 which is the hydraulic motor, the hydraulic cylinder 50 and the shift shaft 46 are operated so that the second spline portion 48 of the shift shaft 46 is driven by the first drive gear 41. ) And the hydraulic cylinder 50 and the shifting shaft 46 are operated when the pressure below the prescribed pressure acts on the driving motor 36 so that the second spline portion 48 of the shifting shaft 46 It may be programmed to engage the drive gear 43.

On the other hand, the hydraulic cylinder 50 and the shift shaft 46 may be operated manually, the controller 56 is installed in the hydraulic switch 50 manual switch for operation, the operator according to the thickness and diameter of the pipe And, the hydraulic cylinder 50 may be operated by operating the manual switch of the controller 56 according to the bending operation state.

The power transmission device of the pipe banding machine of the present invention is made so that the shift operation is made very quickly, when the hydraulic cylinder 50 is operated by the controller 56, the cylinder rod 51 is raised and lowered the shift shaft 46. As a result, the second spline portion 48 of the transmission shaft 46 is engaged with the first spline groove 42 of the first drive gear 41 or the second spline groove of the second drive gear 43 ( 44). Therefore, it is possible to adjust the rotational speed and the rotational force of the bending die 31 in a relatively simple operation in which the cylinder rod 51 of the hydraulic cylinder 50 is elevated.

That is, when the cylinder rod 51 of the hydraulic cylinder 50 is raised and lowered, the rotational power of the reducer 37 is selectively coupled to the first driving gear 41 or the second driving gear 43 so that the bending die 31 of the Transmission and torque increase are achieved. Therefore, since the shifting process performed by the hydraulic cylinder 50, the shift shaft 46, and the drive gear group 40 is made very quickly, the bending work time can be reduced, and thus the bending work efficiency can be improved.

In addition, since the shifting of the bending die 31 is made by one hydraulic cylinder 50, the hydraulic cylinder 50, which is an expensive part, is used to the minimum, and thus the overall unit cost of the pipe bending machine is reduced by that. Since the hydraulic cylinder 50 is expensive compared to other parts, if the number of installation of the hydraulic cylinder 50 is increased, the installation cost of the device is increased accordingly, and thus the manufacturing cost of the product is increased. Therefore, the power transmission device of the pipe bending machine of the present invention solves the above-described problems because it enables to adjust the rotational speed and the rotational force of the bending die 31 by one hydraulic cylinder (50).

6 is a schematic cross-sectional view showing another embodiment of the present invention, in which the drive gear group 60 includes a first drive gear 61 having a first spline groove 62 and a second spline groove 64 formed thereon. The second driving gear 63 and the third driving gear 65 are formed with a third spline groove 66. The first driving gear 61, the second driving gear 63, and the third driving gear 65 of the driving gear group 60 may include the first driving gear 71 and the second driving gear of the electric gear group 70. 72) and third gears 73, respectively.

The shift shaft 80 includes a first spline portion 81 and a first spline groove 62 and a second spline groove of the drive gear group 60 that are engaged with the spline groove 92 of the rotation shaft 91 of the reduction gear 90. 64, a second spline portion 82 that is selectively engaged with the third spline groove 66.

Therefore, when the hydraulic cylinder 50 and the cylinder rod 51 are operated and the shift shaft 80 is elevated, the second spline portion 82 of the shift shaft 80 moves to the first spline groove of the first drive gear 61. 62), the second spline groove 64 of the second drive gear 63, the third drive gear 65 and the third spline groove 66 is selectively engaged.

The power transmission device of the pipe bending machine of the present invention, the drive gear group 60 and the electric gear group 70 is composed of three drive gears and three electric gears, respectively. Therefore, when the hydraulic cylinder 50 and the shifting shaft 80 are operated, the rotation speed and the rotational force of the bending die 31 can be adjusted in three stages, and the rest of the configuration, operation, and effect are the same as those of FIGS. 4 and 5. .

FIG. 7 shows that the drive gear group 100 and the electric gear group 110 are each composed of four drive gears and electric gears, and the second spline portion 121 of the transmission shaft 120 is connected to the four drive gears. It is provided to be selectively engaged. The power transmission device of the pipe banding machine of the present invention, except that the bending die 31 is shifted in four stages compared to FIGS. 4 to 6 and the rest of the configuration and effects are the same as described above.

The present invention is characterized in that the rotational speed and the rotational force of the bending die 31 can be adjusted in various stages by using one hydraulic cylinder 50. In FIGS. 4 to 7, the second, third, and fourth gear shifts have been described. However, the number of drive gears and electric gears may be properly adjusted so that more shifts may be made. It may be easily changed and practiced within the scope of the invention.

The present invention as described above, the second spline portion of the shift shaft is selectively engaged with the first drive gear and the second drive gear can adjust the rotational force and rotational speed of the reducer, relatively simple operation of the cylinder rod of the hydraulic cylinder is elevated As the rotation speed of the banding die is changed, the bending work time can be reduced.Because the speed of the banding die is shifted by one hydraulic cylinder, the hydraulic cylinder, which is an expensive part, is used at a minimum, thereby reducing the overall cost of the pipe banding machine. do.

Claims (5)

In the power transmission device of the pipe bending machine connected to the bending die installed on the table to rotate it, Drive motor 36; A reducer (37) (90) connected to the drive motor (36) and provided with rotation shafts (38) (91) for transmitting power of the drive motor (36) to the outside; Drive gear groups (40) (60) (100) installed on the rotating shafts (38) (91) of the reduction gears (37) (90) and composed of a plurality of drive gears having different diameters; Connected to the rotation shafts 38 and 91 of the reduction gears 37 and 90 and selectively engaged with any one of the driving gear groups 40, 60 and 100 so that the reduction gears 37 and 90 may be Shifting shafts 46, 80, and 120 for transmitting rotational power to the engaged gears; Elevating means connected to the shift shafts (46) (80) (120) so that the shift shafts (46) (80) (120) are engaged with one of the plurality of drive gears; Rotational power is provided on the rotating shaft 32 of the bending die 31 and composed of a plurality of electric gears to be engaged with the plurality of drive gears, respectively, and transmitted from the drive gear groups 40, 60, 100. An electric gear group (33) (70) (110) for transmitting to the rotary shaft (32) of the bending die (31); And a controller (56) connected to the drive motor (36) and the lifting means to control them. The power transmission device of the pipe bending machine, characterized in that consisting of. According to claim 1, wherein the rotary shafts (38) (91) of the reducer (37) (90), Power transmission device of the pipe bending machine, characterized in that the spline groove (39) (92) is formed around the inner circumferential surface. The method of claim 1, wherein the drive gear group 40, A first drive gear 41 having a first spline groove 42 formed around an inner circumferential surface thereof, Power transmission device of the pipe bending machine, characterized in that made of a second drive gear (43) formed with a second spline groove (44) around the inner circumferential surface. The method of claim 2, wherein the shift shaft 46, A first spline portion 47 engaged with the spline groove 39 of the reducer 37 so that the rotational power of the reducer 37 is transmitted; The first spline groove 42 or the second drive of the first drive gear 41 to transmit the rotational power of the reduction gear 37 to the first drive gear 41 or the second drive gear 43. Power transmission device of the pipe bending machine, characterized in that the second spline portion 48 is selectively engaged with the second spline groove (44) of the gear (43). According to claim 1, The lifting means, Power transmission device of the pipe bending machine, characterized in that consisting of a hydraulic cylinder (50).

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