Axis fixing jig for winding machine

Abstract

To provide a shaft fixing jig for a hoisting machine that can stably fix the shaft to be fixed and easily measure the backlash when measuring the backlash of the hoisting machine.SOLUTION: A shaft fixing jig 30 for a hoisting machine 1 has a rod-shaped main body 31, a fulcrum concave part 32 provided in the middle of the main body 31 and engaged with a frame body 3 of the hoisting machine 1, an action point end part 33 which is one end portion of the main body 31 and contacts the side surface of a gear 8c of the shaft to be fixed, and a protruding screw 35 that engages with a nut 34 provided on the other end of the main body 31, changes the protruding amount of the tip, and comes into force point contact with the fixed part around the shaft to be fixed.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a shaft fixing jig for an elevator hoist.

Background Art

[0002] In elevator maintenance inspections, the backlash of each shaft gear of the hoist is measured. To measure the backlash, it is necessary to fix the shaft of the other gear that meshes with the gear to be measured so that it does not move. However, in conventional backlash measurements, there is no dedicated shaft fixing jig, and a method is adopted in which a metal rod such as brass or iron is pressed against the gear side surface of the shaft to be fixed with a fixing part such as a corner of the hoist frame as a fulcrum to fix the shaft so that it does not move.

[0003] Patent Document 1 describes a backlash measuring device for an elevator drive reduction gear.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The backlash measuring device described in Patent Document 1 is provided with a rotary encoder on the outer periphery of the sheave, and measures the rotational displacement of the sheave that reverses due to the imbalance of the car counterweight that occurs when passengers enter and exit, and does not directly measure the backlash of the gear. Further, when the hoist has a plurality of shafts, the backlash of each shaft cannot be measured.

[0006] In the conventional backlash measurement, when fixing the shaft, it is necessary to operate while holding the rod with one hand. For this reason, due to the movement of the body during measurement, the amount of force applied to the rod changes, and the gear may move, which takes time for the measurement. In particular, if the gear diameter of the shaft to be fixed is small and there is no hoisting machine frame body at the position facing the gear side surface, it is necessary to insert the rod obliquely, which takes time to fix the shaft and there is a possibility that accurate measurement cannot be performed.

[0007] An object of the present disclosure is to provide a shaft fixing jig for a hoisting machine that can easily fix a shaft to be fixed when measuring the backlash of each shaft gear of the hoisting machine.

Means for Solving the Problems

[0008] The shaft fixing jig for a hoisting machine according to the present disclosure includes a rod-shaped main body portion, a fulcrum recess provided in the middle portion of the main body portion and engaged with the frame body of the hoisting machine, an end portion on one side of the main body portion, which is an operating point end portion that abuts against the gear side surface of the shaft to be fixed, and a protruding screw that meshes with a nut provided at the other end portion of the main body portion, changes the protruding amount of the tip, and abuts against a force point on the fixing portion around the shaft to be fixed.

Effects of the Invention

[0009] According to the shaft fixing jig for a hoisting machine according to the present disclosure, by inserting the main body portion between the frame body of the hoisting machine and the gear side surface of the shaft to be fixed and adjusting the protruding amount of the protruding screw, while fixing the shaft to be fixed, the shaft fixing jig can be fixed, so there is no need to hold the shaft fixing jig with one hand, and the backlash can be easily measured.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following description, specific shapes, materials, directions, numerical values, etc. are examples for facilitating the understanding of the present disclosure and can be appropriately changed according to applications, purposes, specifications, etc. Also, it is initially assumed that the components of the embodiments and modification examples described below can be selectively combined.

[0012] First, the configuration of the hoisting machine will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing the appearance of the hoisting machine 1 of the elevator, and FIG. 2 is a diagram of the hoisting machine 1 with the upper cover 2 removed, viewed from above. The hoisting machine 1 is a device for raising and lowering the car compartment of the elevator and is installed in the ceiling part of the hoistway or in the pit at the lowest level.

[0013] The hoisting machine 1 has a motor 4 (see FIG. 2) that generates power and a plurality of reduction gear shafts for transmitting the rotation from the motor 4 to the wire rope sheave 5. A wire rope is wound around the wire rope sheave 5, and the car compartment and the weight of the elevator are suspended at both ends of the wire rope. In conjunction with the rotation of the motor 4, the wire rope sheave 5 rotates to move the car compartment of the elevator up and down.

[0014] The hoisting machine 1 has a frame composed of an upper cover 2 and a bottom frame body 3. The upper cover 2 of the hoisting machine 1 is removable. Inspection of the hoisting machine 1 is performed in the state of FIG. 2 with the upper cover 2 removed.

[0015] The motor 4 and the wire rope sheave 5 are arranged at the rear of the hoisting machine 1. Four shafts are installed in the left - right direction on the bottom frame body 3, which is the frame of the hoisting machine 1. Each of the four shafts is rotatably fixed to the bottom frame body 3 around the axis by a bearing.

[0016] In the hoisting machine 1 shown in Fig. 2, a first shaft 6, a second shaft 7, a third shaft 8, and a fourth shaft 9 are arranged from the right. The axial directions of the respective shafts are arranged in parallel. The first shaft 6 is rotatable integrally with the shaft of the motor 4. The rotation of the motor 4 becomes the rotation of the first shaft 6, is sequentially transmitted to the adjacent shaft, and rotates the cable drum 5 connected to the fourth shaft 9. Note that the number of shafts is an example and is not limited to four.

[0017] As shown in Fig. 2, one gear is connected to each of the first shaft 6 and the fourth shaft 9. Two gears of different sizes in the axial direction are connected to each of the second shaft 7 and the third shaft 8. All the gears of the first shaft 6 to the fourth shaft 9 are formed of helical gears in which the teeth are inclined obliquely with respect to the axial direction. Since the helical gear has high strength and is quiet, it is suitable for the hoisting machine. However, it is not essential that the gear is a helical gear, and it may be formed of a spur gear.

[0018] Each of the first shaft 6 to the fourth shaft 9 has a bearing at one end of the shaft and at the middle or the other end of the shaft, and the bearing is fixed to the bottom frame 3 of the hoisting machine 1.

[0019] The first shaft 6 is supported by a bearing 6a provided at one end of the shaft and a bearing 6b provided in the middle of the shaft in front of the motor 4. The bearing 6a and the bearing 6b are fixed to the end of the bottom frame 3. A gear 6d is provided on the first shaft 6 between the bearings 6a and 6b, closer to the bearing 6b.

[0020] The second shaft 7 is supported by a bearing 7a and a bearing 7b provided at one end and the other end of the shaft. The second shaft 7 is provided with a gear 7c having a small diameter on one end side in the axial direction and a gear 7d having a large diameter on the other end side. The gear 7d of the second shaft 7 is arranged to mesh with the gear 6d of the first shaft 6.

[0021] The third shaft 8 is supported by bearings 8a and 8b provided at one end and the other end of the shaft. The third shaft 8 is provided with a gear 8c having a large diameter on one end side in the axial direction and a gear 8d having a small diameter on the other end side. The gear 8c of the third shaft 8 is arranged to mesh with the gear 7c of the second shaft 7.

[0022] The fourth shaft 9 is supported by a bearing 9a provided at one end of the shaft and a bearing 9b provided in the middle of the shaft in front of the chain wheel 5. The fourth shaft 9 is provided with a gear 9d near the bearing 9b. The gear 9d of the fourth shaft 9 is arranged to mesh with the gear 8d of the third shaft 8.

[0023] The hoist 1 receives the rotation of the motor 4 as the rotation of the first shaft 6, and the rotation of the gear 6d of the first shaft 6 is transmitted to the gear 7d of the second shaft 7. Finally, the rotation is transmitted to the fourth shaft 9 through the respective meshing gears on the third shaft 8 and the fourth shaft 9. Due to the rotational movement of the fourth shaft 9, the chain wheel 5 rotates to wind up the wire rope, causing the elevator car to move up and down.

[0024] Next, a method for measuring the backlash of the gear will be described. In the following description, in the case of two shafts where the gears are meshed, the shaft on the side transmitting the rotation may be referred to as the input shaft, and the shaft on the side receiving the rotation may be referred to as the output shaft.

[0025] The measurement of the backlash is performed by fixing the output shaft, manually moving the input shaft, and measuring the displacement with a measuring instrument such as a dial gauge. Therefore, the output shaft becomes the shaft to be fixed. The shaft is fixed by placing the middle of a metal rod against the corner of the bottom frame 3 of the hoist with the corner as a fulcrum and pressing the tip of the rod against the gear side surface of the shaft to be fixed.

[0026] When measuring the backlash of the gear 7c of the second shaft 7 with the third shaft 8 of the hoist 1 in FIG. 2 as the output shaft and the second shaft 7 as the input shaft, with the corner of the bottom frame 3 of the hoist 1 as a fulcrum, a metal rod is pressed against the gear side surface facing the bearing 8a side of the gear 8c of the third shaft 8 to fix the third shaft 8. The same method is used when fixing the other shafts of the hoist 1.

[0027] In the conventional shaft fixing method, since measurement is performed while pressing a fixing rod with one hand, accurate measurement is difficult. Particularly in the case of the hoist 1 shown in FIG. 2, it is difficult to measure the backlash of the first shaft 6. The reason is that when measuring the backlash of the first shaft 6, it is necessary to fix the second shaft 7. However, since the diameter of the gear 7c of the second shaft 7 is small, the bottom frame body 3 does not oppose the gear side surface of the gear 7c. For this reason, in order to fix the second shaft 7, it is necessary to place the middle part of the rod against the corner of the bottom frame body 3 diagonally in front of the gear 7c and insert the rod obliquely toward the gear side surface of the gear 7c. Since measurement is performed while holding the obliquely inserted rod with one hand, the measurement of the backlash of the first shaft 6 may take time due to unstable shaft fixing and may not be accurately measured.

[0028] The shaft fixing jig 30 of the present embodiment solves the above problems.

[0029] Next, the shaft fixing jig 30 of the present embodiment will be described. FIG. 3 shows the shaft fixing jig 30 of the present embodiment, (a) is a front view, and (b) is a side view. The shaft fixing jig 30 includes a rod-shaped main body portion 31. The main body portion 31 is preferably made of metal that is difficult to deform because a force for fixing the shaft is applied as will be described later. Further, since a force is also applied to the gear side surface, brass having appropriate ductility is suitable for preventing damage to the gear.

[0030] The main body portion 31 has a concave portion (fulcrum concave portion 32) at an intermediate portion in the length direction of the rod. The fulcrum concave portion 32 is for forming a fulcrum of the shaft fixing jig 30 by being applied to the frame body of the hoist 1 as will be described later.

[0031] One end in the length direction of the main body portion 31 has an action point end portion 33 for abutting against the gear side surface of the shaft to be fixed. The action point end portion 33 abuts against the gear side surface of the shaft to be fixed and fixes the shaft by pressing the gear side surface.

[0032] A nut 34 is provided at the other end in the length direction of the main body portion 31. A protruding screw 35 is engaged with the nut 34 of the main body portion 31, and the protruding amount of the tip is configured to be changeable.

[0033] The nut 34 is inserted into a through hole 36 provided at the other end of the main body portion 31 and is supported on the side surface by a support shaft 37. The nut 34 is configured to be angle-adjustable with respect to the main body portion 31 about the support shaft 37.

[0034] By configuring the nut 34 to be angle-adjustable, the tip of the protruding screw 35 can be brought into perpendicular contact with the fixing portion as described later, and the shaft fixing jig 30 can be fixed with a strong force. Note that the angle adjustment function of the nut 34 is not essential. A configuration may be adopted in which a screw hole penetrating the main body portion 31 is provided to form the nut 34.

[0035] One end of the protruding screw 35 protrudes from the nut 34. A rotation handle 38 is provided at the other end of the protruding screw 35. By turning the rotation handle 38, the tightening amount of the protruding screw 35 into the nut 34 can be changed. Note that the rotation handle 38 is an example, and for example, a hexagonal head may be provided on the protruding screw 35 and the head may be rotated to adjust the tightening amount into the nut 34.

[0036] The main body portion 31 has a first side surface 39 and a second side surface 40 facing the first side surface 39. The first side surface 39 is the surface from which the protruding screw 35 protrudes. When using the shaft fixing jig 30 as described later, the first side surface 39 is arranged facing the gear side surface of the shaft to be fixed.

[0037] A fulcrum recess 32 is provided on the second side surface 40 of the main body portion 31. The second side surface 40 has an inclined portion 41 toward the acting point end portion 33 of the main body portion 31, and the thickness of the main body portion 31 is reduced. This is to enable the insertion of the shaft fixing jig 30 even when the gap in front of the gear side surface of the shaft to be fixed is small.

[0038] The tip of the first side 39 may have a protective sheet 42. The protective sheet 42 is preferably formed of a resin sheet such as silicon. When fixing the shaft, the working point end 33 of the main body 31 is pressed against the gear side surface of the shaft to be fixed, so the protective sheet 42 is provided so as not to damage the gear side surface.

[0039] Next, referring to FIG. 4, a method of fixing a shaft by the shaft fixing jig 30 of the present embodiment will be described. FIG. 4 shows a partial cross-section taken along the line X-X in FIG. 2, and shows the arrangement of the shaft fixing jig 30 when measuring the backlash of the second shaft 7 with the third shaft 8 of the hoist 1 as the shaft to be fixed.

[0040] As shown in FIG. 4, the main body 31 of the shaft fixing jig 30 is inserted between the bottom frame 3 of the hoist 1 and the side surface of the gear 8c of the third shaft 8.

[0041] The third shaft 8 is fixed as follows. The working point end 33 at the tip of the shaft fixing jig 30 is inserted between the bottom frame 3 and the side surface of the gear 8c of the third shaft 8, and is arranged so that the fulcrum recess 32 provided on the second side 40 of the main body 31 hits the corner (point A) of the bottom frame 3.

[0042] Next, in this state, the main body 31 is tilted so that the working point end 33 abuts against the side surface (point C) of the gear 8c of the shaft to be fixed.

[0043] Next, the rotation handle 38 of the protruding screw 35 is turned to adjust the protruding amount so that the tip of the protruding screw 35 abuts against the side surface of the gear 8c of the shaft to be fixed. By the tip of the protruding screw 35 pressing the point B on the side surface of the gear 8c, the tip of the main body 31 receives a force in the direction of arrow Y in the figure due to the reaction.

[0044] When a force acts in the direction of arrow Y at point B, according to the lever principle, with point A as the fulcrum and point C as the working point, a force that presses the gear side surface in the direction of arrow Z in the figure acts. The third shaft 8 is fixed by the force that is pushed in the direction of arrow Z at point C.

[0045] By pressing point B with sufficient force using the protruding screw 35, the shaft fixing jig 30 can be fixed at three points: the fulcrum A, the force point B, and the action point C. Therefore, there is no need to hold the shaft fixing jig 30 by hand.

[0046] With the shaft fixing jig 30 of this embodiment, the user's hands are free, so the posture is not disrupted during backlash measurement, and thus the backlash can be measured stably.

[0047] The measurement of backlash is performed by using a dial gauge to manually move the gear 7c of the second shaft 7, which is the input shaft, and reading the displacement. Since the method of using a dial gauge is well-known, the details are omitted.

[0048] The shaft fixing jig 30 of this embodiment is configured such that the angle of the nut 34 is adjusted around the support shaft 37. When the tip of the protruding screw 35 abuts against the gear side surface of the shaft to be fixed, the angle of the nut 34 is automatically adjusted, and the tip of the protruding screw 35 can be made to abut perpendicularly against the gear side surface of the shaft to be fixed. Since the tip of the protruding screw 35 can perpendicularly press the gear side surface of the shaft to be fixed, a large force can be applied.

[0049] Next, referring to FIG. 5, another method of fixing the shaft by the shaft fixing jig 30 of this embodiment will be described. A case where the shaft to be fixed in the hoist 1 of FIG. 2 is the second shaft 7 and the backlash of the first shaft 6 is measured will be described.

[0050] Since the diameter of the gear 7c of the second shaft 7 is small, there is no bottom frame body 3 at the position facing the side surface of the gear 7c. Therefore, it is necessary to select a fixing surface to apply force as the fulcrum and force point of the lever. In this case, as shown in FIG. 5, the bottom frame body 3 diagonally in front of the second shaft 7 is used as the fulcrum, and the side surface of the gear 8c adjacent to the second shaft 7, which is the shaft to be fixed, is used as the fixing surface.

[0051] Specifically, the fulcrum recess 32 of the main body 31 is applied to the corner (point A) of the bottom frame 3 diagonally in front of the second shaft 7, and the operating point end 33 is obliquely inserted so as to be applied to the gear side surface (point C) of the gear 7c of the second shaft 7. At this time, the main body 31 is tilted and inserted so that the operating point end 33 faces downward and the protruding screw 35 at the other end faces upward. Then, with the side surface of the gear 8c of the third shaft 8 as the fixed surface, the tip of the protruding screw 35 is applied to the side surface (point B) of the gear 8c.

[0052] In this state, the rotation handle 38 of the protruding screw 35 is turned, and the tip of the protruding screw 35 is brought into contact with the side surface (point B) of the gear 8c with the force point in contact to adjust the protruding amount. As a result, the tip of the protruding screw 35 presses the point B on the side surface of the gear 8c, and by reaction, one end of the main body 31 receives a force in a direction away from the side surface of the gear 8c. In this way, based on the lever principle, with point A as the fulcrum and point C as the operating point, by pressing the side surface of the gear 7c, the second shaft 7 can be fixed.

[0053] Also in the method shown in FIG. 5, by pressing point B firmly with the protruding screw 35, the second shaft 7 is fixed, and the shaft fixing jig 30 can be fixed at three points: the bottom frame 3 (point A), the side surface (point B) of the gear 8c of the third shaft 8, and the side surface (point C) of the gear 7c of the second shaft 7.

[0054] When the jig is inserted obliquely in this way, in the conventional method, it is difficult to fix the shaft, and it is difficult to measure the backlash while holding it with one hand. With the shaft fixing jig 30 of the present embodiment, it is possible to measure stably even in such a case.

[0055] In the present embodiment, the case where the hoist 1 has a helical gear has been described, but it is also applicable when measuring the backlash of the gear of a hoist having spur gears.

[0056] Note that the present invention is not limited to the above-described embodiments and their modifications, and it goes without saying that various changes and improvements can be made within the scope of the matters described in the claims of the present application.

Explanation of reference numerals

[0057] 1 Hoisting machine, 2 Upper cover, 3 Bottom frame body, 4 Motor, 5 Pulley, 6 First shaft, 6a, 6b Bearings, 6d Gear, 7 Second shaft, 7a, 7b Bearings, 7c, 7d Gears, 8 Third shaft, 8a, 8b Bearings, 8c, 8d Gears, 9 Fourth shaft, 9a, 9b Bearings, 9d Gear, 30 Shaft fixing jig, 31 Main body part, 32 Fulcrum recess, 33 Acting point end, 34 Nut, 35 Protruding screw, 36 Through hole, 37 Support shaft, 38 Rotating handle, 39 First side, 40 Second side, 41 Inclined surface, 42 Protection sheet

Claims

1. comprising a rod-shaped main body portion, a fulcrum recess provided in an intermediate portion of the main body portion and engaging with a frame of a hoisting machine, and an acting point end portion which is one end portion of the main body portion and abuts against a gear side surface of a fixed shaft, and a protruding screw which meshes with a nut provided at the other end portion of the main body portion, changes a protruding amount at a tip, and abuts against a force point on a fixing portion around the fixed shaft, having a shaft fixing jig for a hoisting machine.

2. The nut of the main body portion is inserted into a hole penetrating the main body portion provided at the other end portion, and is supported from a side surface of the hole so that an angle can be adjusted, The shaft fixing jig for a hoisting machine according to Claim 1.

3. The main body portion has a thickness that decreases toward the acting point end portion, The shaft fixing jig for a hoisting machine according to Claim 1 or 2.

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