KR100607133B1 - A device for keeping horizontal level of a movable workbench - Google Patents

Abstract

The present invention relates to a device for maintaining a horizontal level in the lifting movable work platform to move up and down, and in detail, to adjust the horizontal state automatically separated when the level is misaligned due to various factors while moving up and down in the lifting work platform It relates to a horizontal holding device of the lifting movable working platform, the case 20 fixed to one side of the lifting movable working platform; Proximity switch fixing parts 23 and 22 are formed in the case 20, and the left proximity switch 51 and the right proximity switch 52 are respectively fixed to the proximity switch fixing parts 23 and 22, respectively. A proximity switch composed of a proximity switch 50; The sensing pin 33 is fixed to the upper portion of the body 31 so as to be located at the center of the proximity switch, one end of the fixing pin 34 is fixed to the case 20, and the body 31 is rotatable. The assembly assembly 30 is securely fixed; A cover 24 covering and fixing the upper surface of the case 20; Balanced weight 32 is fixed to the lower body 31; When the sensing pin 33 is close to the left proximity switch 51 or the right proximity switch 52, the left motor or the right motor is operated to level it. When the sensing pin 33 is close to the center proximity switch 50, the left proximity switch 51 and the And a control unit comprising a switch opening and closing circuit for controlling to stop the operation of the right proximity switch 52.

Leveling, mobile workbench, sensing pin, counterweight, assembly

Description

A device for keeping horizontal level of a movable workbench}

1 is a view showing the lifting movable working platform of the present invention.

Figure 2 is a view showing a horizontal holding device of the lifting movable working platform of the present invention.

Figure 3 is an exploded perspective view of the chum assembly used in the horizontal holding apparatus of the present invention.

Figure 4 is a front view of the assembly of the horizontal holding device of the present invention.

Figure 5 is a vertical cross-sectional view of the assembly of the horizontal holding device of the present invention.

6 is a view showing a cover of the horizontal holding apparatus of the present invention.

Figure 7 is an operation of the lifting movable platform of the present invention out of the horizontal.

 <Brief description of symbols for the main parts of the drawings>

1: lifting work platform 2: pendant switch

3: control box 4, 5: winder

6: left motor 7: right motor

8: rail 9: wire

10: horizontal holding device 20: case

21: cover fixing part 22, 23: proximity switch fixing part

24: cover 25: side hole

30: assembly assembly 31: the body

32: balance weight 33: sensing pin

34: fixed pin 35: bearing

36: counterweight hole 37: pinhole

38, 39: snap ring 40: bearing cover

41: engaging portion 50: center proximity switch

51: left proximity switch 52: right proximity switch

53: screw portion 54: bolt

The present invention relates to a device for maintaining a horizontal level in the lifting movable work platform to move up and down, and in detail, to adjust the horizontal state automatically separated when the level is misaligned due to various factors while moving up and down in the lifting work platform A leveling device for an elevating movable work platform.

In general, when working in high places such as high-rise buildings or ships, for the safety of the worker or convenience of work to install a lifting movable work platform and using it to perform a variety of work such as window construction plastering painting.

Such a lifting mobile work platform is generally installed to the left and right motors for driving to move up and down by operating the drive motor at the same time.

However, in such a control method, each motor generates a difference in opening / closing time of the power source or a difference in rotational speed during operation, thereby causing the horizontal level of the lifting movable working platform to be distorted. This horizontal level is distorted due to various causes except for the above case.

This horizontal level distortion may impair the safe operation of the operator, and if the horizontal distortion is severe, it may damage the drive wire or the drive chain, it may cause damage to the mounting bracket connecting the drive chain and the workbench. In addition, there is a risk of safety accidents of people working on such inclined workbench, and there is a fear that items for work on the lifting mobile workbench fall down and cause an accident.

In order to solve this problem, the horizontal holding device selected by the present applicant has a central proximity switch installed at the center of the upper part, and a left proximity switch right access switch is installed at the left and right sides of the cylindrical measuring part, which is installed to be rotated in the center. Accordingly, each proximity switch is formed to detect a state that is separated from the horizontal.

However, even if the lifting movable work platform is separated from the horizontal, the size of the measuring unit is formed too large, the central proximity switch for detecting the state of the horizontal problem occurs that always detects the measuring unit. In addition, since the pivoting center rotated in the semi-circular guide is left and right more than necessary due to the movement due to the horizontal deviation, accurate measurement was difficult.

 The present invention has been made in order to solve the above-mentioned problems, it is easy to send a signal to detect the horizontal deviation to one side of the lifting movable work platform to operate the motor located below the horizontal relative to the rising and moving the motor located above It stops to level, and when it descends, it operates the motor located above the horizontal, stops the motor located below to level it, and detects the exact deviation and keeps the lifting platform Its purpose is to provide a leveling device.

The present invention, the left and right motors are installed on the left and right, respectively, in order to achieve the above object, the lifting movable work platform to move up and down by winding at the same time, the case is fixed to one side of the lifting mobile workbench; Proximity switch fixing parts are formed on the left and right sides of the case while looking toward the center, and proximity switch fixing parts are formed on the upper side of the center of the proximity switch fixing part, and the left proximity switch right proximity switch is fixed to the proximity switch fixing part, respectively. Proximity switch consisting of a switch; A sensing assembly in which a sensing pin is fixed to an upper portion of the thrust body so as to be positioned at the center of the proximity switch, one end of the fixing pin is fixed to the case, and the thrust assembly is rotatably fixed; A cover to cover and fix the upper surface of the case; A balance weight fixed to the lower body of the weight assembly; When the sensing pin is close to the left proximity switch or the right proximity switch to operate the left motor or the right motor to level, and close to the center proximity switch to switch switching circuit for controlling to stop the operation of the left and right proximity switch The sensing pin and the counterweight are characterized in that the pinhole and the counterweight hole formed in the upper and lower portions of the weight body is fixed in a fitting manner, the screw portion around the body of the proximity switch Is formed is characterized in that the adjustable screw fixing the screw portion of the proximity switch to the proximity switch fixing, horizontal maintenance of the lifting movable platform, characterized in that the bearing is installed between the body and the fixing pin Provide the device.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the movable work platform shown in FIG. 1 is movable up and down by a vertical movement and a trolley, and a pendant switch controlling left and right movements is formed separately, and left and right movements are not objects of the present invention, and are kept horizontal when moving up and down. It relates to a device to.

The movable movable work platform 1 of the present invention is operated up and down by a pendant switch 2, and the pendant switch 2 opens and closes the connection of the power applied through the control unit to the left installed on the movable movable work platform. The operation of the motor 6 and the right motor 7 is controlled.

The horizontal holding device 10 of the present invention is most preferably installed to be located in the center of the front or rear rail of the lifting movable worktable 1, the detailed configuration is as follows.

The horizontal holding device may include a body composed of a case 20 and a cover 24, three proximity switches mounted inside the case 20, and a sensing pin at a center of the proximity switches. The main assembly is fixed to the interior assembly 30 that responds to the horizontal state.

The lifting movable work platform 1 is provided with a left motor and a right motor respectively installed on the left and right sides to simultaneously move up and down, thereby fixing the case 20 to one side of the lifting work platform 1. The case 20 is fixed to the lifting movable worktable 1 by forming a fixing part on one side. The case 20 is most preferably fixed to the center of the handrail in front or rear of the lifting movable worktable 1, the fixing means of the fixing portion can be fixed with bolts and nuts, or with screws and other known Fixing means may be used.

A proximity switch fixing part is formed in the case 20 to fix the proximity switch. The left proximity switch 51 and the right proximity switch 52 and the central proximity switch 50 fixed to the upper left and right sides are fixed. . The left proximity switch 51 and the right proximity switch 52 are fixed to the proximity switch fixing part 23 so as to face each other, and the central proximity switch 50 is formed of the left proximity switch 51 and the right proximity switch 52. It is fixed downward to the proximity switch fixing portion 22 formed in the upper middle point.

The left proximity switch 51, the right proximity switch 52, and the central proximity switch 50 are operated by being connected to a control unit.

And the cover fixing part 21 for fixing the cover inside the case 20 is formed to protrude to a predetermined height, the screw through the screw hole formed in the cover 24 of the cover fixing part 21 Fix it.

The cover 24 for covering and fixing the upper surface of the case 20 is formed in the shape of a rectangular box having an approximately downward opening, and side holes 25 are formed at the side thereof to enable connection of an electric line or a cable.

One end of the fixing pin 34 of the chute assembly 30 is fixed to one side of the case 20, and the sensing pin 33 is fixed to the center of the upper body 31 of the chute assembly 30. In addition, the sensing pin 33 moves the assembly 30 to be located at the center of the measurement surfaces of the three proximity switches, the left proximity switch 51, the right proximity switch 52, and the central proximity switch 50. Fix it to the case 20.

The balance weight 32 is fixed to the lower center of the weight body 31 of the weight assembly 30, and the balance weight 32 and the sensing pin 33 are pinholes formed on the lower and upper portions of the weight body 31, respectively. (37) and the counterweight hole (36) can be fixed by interference fit method, or by forming a screw thread can be fixed by screwing. This fixing method may use other conventional methods.

The corpuscle body 31 has a cylindrical shape, and the fixing pin 34 is rotatably fixed therein. A bearing 35 is installed between the fixing pin 34 and the body 31 to allow rotation between the two components. The bearing 35 uses a ball bearing, and both ends of the bearing case are inserted and fixed between the fixing pin 34 and the outer surface of the vertebral body 31. And the side end is caught by the catching portion 41 formed by protruding the various parts on one side of the vertebral body 31 so as not to escape to the outside, the ends of the bearing 35 and the fixing pin 34 is a snap ring (39) Secure by The end of the fixing pin 34 is formed with a groove to which the snap ring 39 is fixed so that the snap ring 39 is fitted into the groove.

The snap ring 38 is fixed to the other side of the bearing 35 and the inner diameter of the corpuscle body 31. The snap ring 38 is inserted into a groove formed in the inner diameter of the corpuscle body 31 to prevent the bearing 35 from being separated.

Accordingly, one side of the bearing 35 is fixed to one end of the fixing pin 34 inserted into the inner diameter of the bearing 35 by the snap ring 39, and the other end of the bearing 35 is snapped by the snap ring 38 on the inner diameter of the body 31. Fix it.

In addition, the bearing cover 40 is formed on the side of the bearing 35 to prevent foreign substances from entering the outside.

When the sensing pin 33 is close to the left proximity switch 51 or the right proximity switch 52, the left motor or the right motor is operated to level, and when the sensing pin 33 is close to the central proximity switch 50, the left proximity switch 51 And a control unit including a switch opening and closing circuit for controlling the operation of the right proximity switch 52 to stop the operation of the motor by sensing the deviation of the horizontal by electrically connecting the proximity switch and the motor.

The proximity switch has a threaded portion 53 formed around the body, and the screw portion of the proximity switch is fixed to the proximity switch fixing part with a bolt 54.

The proximity switch fixing parts 22 and 23 are formed with holes or semi-circular grooves on one side, and the proximity switch fixing parts 22 and 23 are fixed by welding to the case 20. When the body of the proximity switch is inserted into the groove or the hole of the proximity switch fixing part, and the bolts are fixed along the thread of the proximity switch by bolts on both sides of the proximity switch fixing part, two bolts press the proximity switch fixing part. It will be fixed. At this time, if the bolt is adjusted, the position of the proximity switch can be changed by a desired position.

The left proximity switch 51, the right proximity switch 52, and the central proximity switch 50 are connected to a controller configured to detect a horizontal deviation and to open and close the power supply of the left and right motors in the following manner. .

The sensing pin fixed to the upper body in the pivot assembly fixed to the inside of the horizontal holding device 10 fixed to the lifting movable work platform 1 is always in the direction of gravity by the counterweight fixed to the lower body. Will face.

At this time, if the lifting movable work platform 1 is inclined so that the left side is horizontally upward due to various factors, the sensing pins on the linearity with the weight are also maintained in a direction perpendicular to gravity.

However, since the case 20 is fixed to the lifting movable worktable 1, the case 20 is inclined as much as the lifting movable worktable 1 is inclined. As such, when the case 20 is inclined at a high left side, the left proximity switch 51 fixed to the inner left side of the case 20 is closer to the sensing pin, and the left proximity switch sensing the sensing pin ( 51) stops the left motor (6) and operates the right motor (7) to maintain the level.

When it comes to a horizontal state, the central proximity switch 50 senses the sensing pin 33 and sends a signal to stop the operation of the left proximity switch 51 and the right proximity switch 52 to the left motor 6 and the right The motor 7 is operated simultaneously to return to the original operation of raising or lowering.

On the contrary, when the movable movable work platform 1 is inclined so that the right side is above the horizontal, the sensing pin moves closer to the right proximity switch 52 while moving away from the central proximity switch 50, so that the right proximity switch 52 operates. The right motor 7 is stopped and the left motor 6 is operated to keep level. When the horizontal proximity switch 50 detects the sensing pin again, the horizontal proximity switch 50 stops the operation of the left proximity switch 51 and the right proximity switch 52 so that the original rise and fall is achieved.

At this time, look at the operation of the control of the control unit to maintain the horizontal when the lifting platform of the lifting and lowering, when the left side is tilted upward to stop the left motor, raise the right motor to level, and the right to tilt upward Stop the right motor and raise the left motor to level it.

When descending the lifting platform, tilt the left side upward to stop the right motor and lower the left motor to level it; if tilting the right side upward, stop the left motor and lower the right motor to level it.

As described above, the present invention automatically detects a state in which the horizontal movement of the elevating movable workbench is displaced, and when the left side is raised, the left motor is stopped and the right motor is raised to level the right side. Stop the motor and raise the left motor to keep leveling up.If the left side goes up when the lifting platform is lowered, stop the right motor and lower the left motor to level it, and if the right side goes up, stop the left motor. As the right motor is lowered, the process of automatically lowering the horizontal level is automatically performed, so that the worker does not care about the horizontal twist and thus the workability and safety are increased.

And since the device can also be made simply attached, there is the convenience of manufacturing. In addition, by sensing by the proximity switch to prevent the occurrence of abrasion due to mutual contact and durability is improved even in continuous use, thereby preventing malfunction due to this has the effect of improving the operation reliability.

Since the central proximity switch stops the operation of the left and right proximity switches, if the measuring section detected by the central proximity switch is too large, the central proximity switch will sense even if it is in a wide range of position. The sensing pin of the present invention has the effect of detecting the accurate operation only when located in the center.

Claims (4)

In the lifting and moving platform, the left and right motors are installed on the left side and the right side to wind up and down at the same time. A case 20 fixed to one side of the lifting movable worktable; Proximity switch fixing part 23 is formed on the left and right sides of the case 20 while looking toward the center, and proximity switch fixing part 22 is formed on the upper side of the center of the proximity switch fixing part 23. A proximity switch composed of a left proximity switch 51 and a right proximity switch 52, which are respectively fixed to the fixing parts 23 and 22, respectively; The sensing pin 33 is fixed to the upper portion of the body 31 so as to be located at the center of the proximity switch, one end of the fixing pin 34 is fixed to the case 20, and the body 31 is rotatable. The assembly assembly 30 is securely fixed; A cover 24 covering and fixing the upper surface of the case 20; A balance weight (32) fixed to a lower body weight (31) of the weight assembly (30); When the sensing pin 33 is close to the left proximity switch 51 or the right proximity switch 52, the left motor or the right motor is operated to level, and when the sensing pin 33 is close to the central proximity switch 50, the left proximity switch 51 And a control unit comprising a switch opening and closing circuit for controlling to stop the operation of the right proximity switch (52). The method of claim 1, wherein the sensing pin 33 and the counterweight 32 is characterized in that it is fixed to the pinhole 37 and the counterweight hole 36 formed on the upper and lower portions of the body 31 by the interference fit method. Leveling device of lifting mobile workbench. The lifting movable platform of claim 1, wherein a screw portion 53 is formed around the body of the proximity switch to fix the screw portion of the proximity switch to the proximity switch fixing part with a bolt 54. Leveling device. 2. The horizontal holding apparatus of an elevating movable working platform according to claim 1, wherein a bearing (35) is provided between the weight body (31) and the fixing pin (34).

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