Elevator hoist

Abstract

To provide an elevator hoist capable of suppressing dust from entering inside a cover even when the cover has an opening in a portion through which a rope passes. [Solution] The present invention comprises a rotating part 3 having a sheave, a fixed part 2 supporting the rotating part 3, a bearing 5 provided between the rotating part 3 and the fixed part 2, and an adsorbent 6 arranged in a flow path for oil leaking from the bearing 5, the adsorbent 6 being in the form of a sheet whose thickness direction coincides with the radial direction, and whose appearance changes when it absorbs oil, and having an observation hole H through which the radially facing surface of the adsorbent 6 can be seen from outside the hoist 1.

Description

[Technical Field]

[0001] The present invention relates to an elevator hoist. [Background technology]

[0002] The elevator hoist is provided with a sheave for suspending a car and a counterweight via a rope (Patent Document 1). To rotate the sheave, a bearing is provided in the hoist between a rotating part and a fixed part that supports the rotating part. Grease, for example, is sealed inside the bearing for lubrication. This grease is composed of base oil, thickener, additives, etc. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-219274 Summary of the Invention [Problem to be solved by the invention]

[0004] The liquid base oil that separates from the hoisting machine due to this phenomenon can leak out of the bearings, and this leaked base oil can contaminate the machine room and elevator shaft outside the hoisting machine.It can also find its way into the brake of the hoisting machine and interfere with braking.

[0005] One possible solution to this problem is to provide an adsorbent in the path through which the base oil flows out, but in this case, the adsorbent must be replaced depending on the degree of base oil adsorption.

[0006] An object of the present invention is to provide an elevator hoisting machine that can replace an adsorbent at an appropriate time. [Means for solving the problem]

[0007] The elevator hoist of the present invention comprises a rotating part having a sheave, a fixed part supporting the rotating part, a bearing provided between the rotating part and the fixed part, and an adsorbent material arranged in a flow path for oil leaking from the bearing, the adsorbent material being in the form of a sheet whose thickness direction coincides with the radial direction, whose appearance changes when it absorbs oil, and which is provided with an observation hole through which the radially facing surface of the adsorbent material can be seen from outside the hoist.

[0008] With this configuration, the condition of the adsorbent, whose appearance changes as it absorbs oil, can be confirmed through an observation hole provided in the hoist, and the adsorbent can be replaced at an appropriate time depending on the results.

[0009] In the elevator hoist, the adsorption material may be annular and provided around the rotation center of the rotating part.

[0010] With this configuration, the annular adsorbent can be easily disposed relative to the rotating part.

[0011] In the elevator hoist, a collecting section for collecting oil may be provided in a portion of the rotating section or the fixed section that faces the adsorbent in the vertical direction.

[0012] According to this configuration, the collecting section that collects the oil can guide the base oil leaking from the bearing to the adsorbent without scattering it. [Effects of the Invention]

[0013] As described above, according to the present invention, it is possible to provide an elevator hoisting machine that allows the adsorption material to be replaced at an appropriate time. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a front view of the elevator hoist of the present invention. [Figure 2] FIG. [Figure 3] FIG. 3 is an enlarged view of a main part of FIG. 2. [Figure 4]FIG. 10 is a front view of an elevator hoist according to a modified example of the present invention. [Figure 5] FIG. 2 is a longitudinal sectional side view of the elevator hoisting machine. [Figure 6] FIG. 6 is an enlarged view of a main part of FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of an elevator hoist according to the present invention will be described below with reference to Figs. 1 to 3. The hoist 1 is provided with a rotatable sheave (not shown) around which a rope (not shown) is wound for suspending a car carrying people and / or luggage and a counterweight (neither of which are shown). The hoist 1 is disposed above or below a hoistway through which the car ascends and descends, or within the hoistway. In the following description of Fig. 2, the left-right direction of the plane of the paper is defined as the front-rear direction, the up-down direction of the plane of the paper as the up-down direction, and the direction penetrating the plane of the paper as the left-right direction.

[0016] The hoist 1 includes a rotating section 3 having a sheave, a fixed section 2 that supports the rotating section 3, and a bearing 5 provided between the rotating section 3 and the fixed section 2. As shown in FIG. 3, the hoist 1 also includes an adsorbent 6 that is arranged in a flow path R1 for oil (base oil separated from grease) leaking from the bearing 5. In this embodiment, the hoist 1 includes two braking sections B (see FIG. 1) for braking the sheave.

[0017] As shown in Figure 2, the fixed part 2 includes, for example, a fixed side main body part 21 that is fixed to the floor surface, and a hollow fixed shaft part 22 that extends from approximately the center of the fixed side main body part 21 in the vertical direction to one side in the axial direction (to the front side in Figure 2).

[0018] The fixed side main body portion 21 is made of a metal material and is provided with a first cylindrical portion 211 formed to protrude radially outward from the other axial end portion (rear end portion in Figure 2) of the fixed shaft portion 22, a first circumferential wall portion 212 extending radially outward from one axial end portion (front end portion in Figure 2) of the first cylindrical portion 211, a second cylindrical portion 213 extending from the outer peripheral edge of the first circumferential wall portion 212 to the other axial end portion (rear end portion in Figure 2) and constituting a stator, a second circumferential wall portion 214 extending radially outward from the other axial end portion (rear end portion in Figure 2) of the second cylindrical portion 213, a third cylindrical portion 215 extending from the outer peripheral edge of the second circumferential wall portion 214 to one axial end portion (front end portion in Figure 2), and a pair of legs 216, 216 (see Figure 1) extending downward from the outer peripheral surface of the third cylindrical portion 215. A coil 213M is wound around the radially outer surface of the second cylindrical portion 213 (see FIG. 2).

[0019] The rotating part 3 is rotatable relative to the fixed part 2. The sheave and the rotating part 3 rotate integrally as a result of the rotation of the rotating part 3. The rotating part 3 is made of a metal material and includes a cylindrical part 31 fitted onto the bearing 5, a disk-shaped plate part 32 extending radially outward from the other axial end of the cylindrical part 31 (the rear end in FIG. 2), and a cylindrical rotor 33 extending from the outer circumferential edge of the plate part 32 toward the other axial end (the rear end in FIG. 2).

[0020] The rotor 33 is provided with a plurality of permanent magnets 33A spaced apart in the circumferential direction, and when electricity is passed through the coils 213M of the second cylindrical portion (stator) 213, the rotor 33 rotates and the sheave rotates. The rotor 33 having the permanent magnets 33A and the stator (second cylindrical portion 213) having the coils 213M constitute a motor. In this embodiment, an outer rotor type motor is used, but an inner rotor type motor may also be used.

[0021] The bearing 5 rotatably supports the rotating part 3 relative to the fixed part 2. A plurality of bearings 5 ​​(two in this embodiment) are provided in the axial direction, and are positioned between the outer circumferential surface of the fixed shaft part 22 and the inner circumferential surface of the cylindrical part 31 of the rotating part 3. The bearings 5 ​​include a first bearing 51 located at one axial end (front side) and a second bearing 52 located at the other axial end (rear side). The bearings 5 ​​can be configured with at least one type of bearing selected from the group consisting of a self-aligning roller bearing, a ball bearing, and a tapered bearing, and the number and specific configuration of the bearings 5 ​​are not limited.

[0022] The fixed shaft portion 22 includes a cylindrical shaft main body 220 and a shaft extension portion 221 that extends further forward from the front end of the shaft main body 220. A recess 222 that is recessed radially inward is provided at the radial outer end of the shaft extension portion 221 (see FIG. 3). The recess 222 is provided continuously around the rotation center axis X of the rotating portion 3. The front end portion of the recess 222 is defined by an inclined surface 2220 that is inclined so as to approach the rotation center axis X of the rotating portion 3 as it approaches the rear. The radial cross section of the inclined surface 2220 has a flat surface, but may also be a curved surface.

[0023] The cover member 10 comprises a front plate portion 101 having a circular outer shape, a cylindrical portion 102 extending rearward from the outer periphery of the front plate portion 101, and a disk-shaped annular portion 103 protruding radially outward from the rear end of the cylindrical portion 102. As shown in Fig. 2, an encoder 13 for measuring the rotation speed of the sheave is provided in the center of the inside of the front plate portion 101 of the cover member 10. The main body of the encoder 13 is fixed to the fixed shaft portion 22 with multiple screws B1 (two in Fig. 2).

[0024] Braking unit B is composed of an electromagnetic brake (see Figure 1) that applies braking to rotor 33 by switching from a non-braking state in which it is separated from the outer surface of rotor 33 to a braking state in which it presses against the outer surface of rotor 33 to brake it.

[0025] In this embodiment, for example, grease is sealed inside the two bearings 51 and 52 for lubrication. This grease is composed of base oil, thickener, additives, etc. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

[0026] The liquid base oil that separates due to this phenomenon may leak out from bearings 51 and 52, and this leaked base oil may contaminate the machine room or elevator shaft outside the hoisting machine 1. It may also find its way around to the braking section B of the hoisting machine 1 and interfere with braking. To address this issue, as shown in Figure 3, the adsorbent 6 is provided in the flow path R1 along which the base oil flows, as described above.

[0027] The adsorbent 6 is disposed on the fixed part 2, specifically on the fixed shaft part 22. The adsorbent 6 is disposed axially outward (frontward) of the bearing 5 (first bearing 51). The adsorbent 6 is also disposed at a position offset in the up-down direction from the bearing 5 (first bearing 51).

[0028] The adsorbent 6 is in the form of a sheet whose thickness direction coincides with the radial direction, and its appearance changes as it absorbs oil. For example, the adsorbent 6 changes from a light color to a dark color as it absorbs oil. The adsorbent 6 may be made of any material other than woven felt, as long as it can absorb oil. For example, the adsorbent 6 may be in the form of a sponge or a paper cloth.

[0029] In this embodiment, the adsorbent 6 receives oil leaking from the bearings 51 and 52 (oil passing through flow path R1). Flow path R1 is a flow path that runs from the front end of the first bearing 51 to the adsorbent 6 via the fixed shaft portion 22. The adsorbent 6 also receives oil that adheres to and drips from the cover member 10 (oil passing through flow path R2). Flow path R2 is a flow path that runs from the front end of the first bearing 51 to the adsorbent 6 via the rear end of the annular portion 103 and the rear end of the cylindrical portion 102 of the cover member 10. Flow path R2 is formed when oil that has accumulated in a portion of the annular portion 103 that is located below the rotation center axis X moves above the adsorbent 6 as the rotating portion 3 rotates.

[0030] In this embodiment, the adsorbent 6 is disposed in the recess 222 of the shaft extension 221 of the fixed shaft 22. The oil adhering to and dripping from the cover member 10 (the oil passing through the flow path R2) is guided to the adsorbent 6 along the inclined surface 2220.

[0031] The observation hole H is provided in either the fixed part 2 or the rotating part 3, whichever member is provided with the adsorbent 6. In this embodiment, the observation hole H is provided in the fixed part 2. The observation hole H is a circular through-hole that extends parallel to the central axis X of rotation of the rotating part 3. Specifically, a plurality of circular observation holes H (two in FIG. 2) are formed in the circumferential direction of the circular front plate part 101 of the cover member 10 (see FIG. 1). In this embodiment, the plurality of observation holes H are arranged diagonally. Note that the observation holes H may have other shapes.

[0032] From the observation hole H, the surface of the adsorbent 6 facing the radial direction (specifically, the radially outward direction) can be seen from outside the hoist 1 (see FIG. 2). The observation hole H is also used to insert the screw B1, another component of the hoist 1, to fix the main body of the encoder 13 to the fixed shaft portion 22. With this configuration, the state of the adsorbent 6, whose appearance changes when it absorbs oil, can be confirmed through the observation hole H provided in the hoist 1 (fixed portion 2). Based on the results, the adsorbent 6 can be replaced at an appropriate time. Furthermore, since the hoist 1 has multiple observation holes H, it is possible to select an observation hole H that is easy to see and observe the adsorbent 6 from the selected observation hole H. Furthermore, by observing the adsorbent 6 from multiple observation holes H arranged diagonally, the state of the adsorbent 6 can be easily observed. For example, if the hoist 1 is installed in an elevator without a machine room, it can be difficult to adjust the height to a position that is easy to see when accessing the hoist 1 from above the car. However, the presence of multiple observation holes H makes it easy to observe the adsorbent 6.

[0033] In this embodiment, because the fixed shaft portion 22 has an inclined surface 2220, the line of sight when checking the state of the adsorbent 6 is obliquely directed from the radially outer side to the radially inner side. This has the advantage that the radially outer surface (top surface) of the adsorbent 6 can be seen more clearly than when viewing the state of the adsorbent 6 from directly to the side. Furthermore, the observation hole H is configured to ensure this line of sight.

[0034] Furthermore, the adsorbent 6 is annular and disposed around the rotation center of the rotating unit 3. This makes it easy to arrange the annular adsorbent 6 relative to the rotating unit 3. In this embodiment, the adsorbent 6 is annular and disposed around the entire circumference of the rotation center of the rotating unit 3, but it may also be disposed on a portion of the circumference. When the adsorbent 6 is disposed on a portion of the circumference of the rotation center of the rotating unit 3, it is preferable that the adsorbent 6 be disposed on at least half the circumference. In particular, when the adsorbent 6 is disposed on the fixed unit 2 as in this embodiment, the circumferential positional relationship between the oil passing through the flow paths R1 and R2 and the adsorbent 6 remains unchanged, so the adsorbent 6 can be disposed only in a circumferential section sandwiching the predicted oil drip position. For example, the adsorbent 6 may be disposed only in the upper half of the recess 222 of the shaft extension 221 of the fixed shaft unit 22.

[0035] The adsorbent 6 can be attached and detached through the observation hole H. However, this is not limitative, and a dedicated opening for attaching and detaching the adsorbent 6 may be provided in the fixed part 2 or the rotating part 3.

[0036] In this embodiment, the rotating part 3 is provided with a collecting section 7 for collecting oil in a portion facing the adsorbent 6 in the vertical direction (see FIG. 3). Specifically, the collecting section 7 is formed in a tapered edge shape (the cross-sectional shape is a protrusion protruding toward the adsorbent 6) with the width of the protruding side narrowing, and the oil is guided to the tip of this edge-shaped portion, and when the tip is positioned above the adsorbent 6 as the rotating part 3 rotates, the oil falls onto the adsorbent 6. In this way, the collecting section 7 for collecting oil can guide the base oil leaking from the bearing 5 to the adsorbent 6 without scattering it. The collecting section 7 may also be provided in a portion of the fixed part 2 facing the adsorbent 6 in the vertical direction.

[0037] Specifically, the collecting portion 7 is provided on the cover member 10. The collecting portion 7 is provided on the edge of the annular portion 93 of the cover member 10 on the side of the rotation center axis X of the rotating portion 3. The collecting portion 7 is a protrusion having a triangular shape in cross section, which is composed of a flat surface 71 extending in the vertical direction and an inclined surface 72 inclined relative to the vertical direction. The angle between the flat surface 71 and the inclined surface 72 is an acute angle. Note that a portion of the collecting portion 7 may be formed in a shape that temporarily receives oil, for example, a recessed shape.

[0038] The present invention can be modified in various ways without departing from the spirit and scope of the invention. The specific configurations of the various parts are not limited to the above-described embodiments.

[0039] For example, as shown in Figures 4 to 6, the hoisting machine 1 may be provided with an oil seal S for preventing oil (base oil separated from grease) leaking outward in the axial direction from the bearing 5 from being discharged to the outside of the hoisting machine 1. In this configuration, a collecting section 7 is not provided.

[0040] In this configuration, as shown in Figure 5, the fixed side main body portion 21 comprises: a ring-shaped first peripheral wall portion 1211 extending radially outward from the other axial end (rear end in Figure 5) of the fixed shaft portion 22; a first cylindrical portion 1212 extending from the outer peripheral edge of the first peripheral wall portion 1211 toward the other axial side (rear end in Figure 5) and formed with a larger diameter toward the other end (rear end); a ring-shaped second peripheral wall portion 1213 extending radially outward from the other axial end (extending end) of the first cylindrical portion 1212; a cylindrical second cylindrical portion 1214 extending from the outer peripheral edge of the second peripheral wall portion 1213 toward one axial side (front side in Figure 5) and constituting a stator; and an upper wall portion 1215 and a lower wall portion 1216 extending vertically from the outer peripheral edge of the second cylindrical portion 1214. 4, the fixed main body 21 also includes a pair of legs 1217, 1217 formed at the lower end of the lower wall 1216. A coil 1214M is wound around the inside of the second cylindrical portion 1214 (see FIG. 5).

[0041] The rotating unit 3 includes a cylindrical portion 31 fitted onto the bearing 5, a disk-shaped plate portion 32 extending radially outward from the other axial end of the cylindrical portion 31, and a cylindrical rotor 33 extending from the base end of the plate portion 32 toward the other axial end. The rotor 33 includes a permanent magnet 33A, and when electricity is applied to the coil 1214M of the second cylindrical portion (stator) 1214, the rotor 33 rotates and the sheave rotates. The plate portion 32 is braked by being sandwiched between braking portions B. The rotor 33 and the stator (second cylindrical portion 1214) form a motor. In this embodiment, an inner rotor type motor is used, but an outer rotor type motor may also be used.

[0042] In this configuration, a plurality of (six in FIG. 4) substantially fan-shaped observation holes H are formed in the circumferential direction in the circular front plate portion 101 of the cover member 10. These observation holes H are used to insert the bolts B1 and screws B3, which are other components that make up the hoist, as well as to check the state of the adsorbent 6. Furthermore, the observation holes H are also used to visually check the oil seal S.

[0043] The oil seal S is configured in an annular shape and is disposed at a position axially outward of the bearing 51. Specifically, as shown in FIG. 6, the oil seal S seals between the inner circumferential surface 102B of the cylindrical portion 102 of the cover member 10 and the outer circumferential surface 151G of the outer annular wall portion 151B of the end member 15. The outer circumferential surface 151G of the outer annular wall portion 151B is a portion (sliding portion) against which the oil seal S rubs as the rotating portion 3 rotates, and this portion requires lubrication. The oil seal S prevents oil leaking from the first bearing 51 from being discharged to the outside of the hoist. In this embodiment, the radially outer portion of the front end portion of the outer annular wall portion 151B has a chamfered corner.

[0044] As mentioned above, the observation hole H is formed so that at least a portion of the oil seal S can be seen, and also so that lubricant can be supplied in the event that the oil seal S makes an abnormal noise or there is insufficient lubrication.

[0045] When the oil seal S is visually inspected through the observation hole H, if it is determined that a lubricant (e.g., oil) needs to be supplied to the oil seal S, a liquid lubricant (e.g., oil) is sprayed from a spray can through the observation hole H to supply the oil to the oil seal S. The amount of lubricant supplied should be just enough so that the lubricant is present in the parts that come into contact (rub) with the oil seal S due to the rotation of the rotating part 3.

[0046] In this embodiment, the adsorbent 6 receives oil leaking from the bearings 51 and 52 (oil passing through flow path R3). Flow path R3 is a flow path that runs from the front end of the first bearing 51 to the adsorbent 6 via the oil seal S and the outer annular wall portion 151B of the end member 15. The adsorbent 6 also receives oil that adheres to and drips from the cover member 10 (oil passing through flow path R4). Flow path R4 is a flow path that runs from the front end of the first bearing 51 to the adsorbent 6 via the oil seal S, the cylindrical portion 102 and front plate portion 101 of the cover member 10.

[0047] The adsorbent 6 is disposed at the fixed part 2, specifically at the front end of the fixed shaft part 22. More specifically, the adsorbent 6 is disposed in the recess 222 of the shaft part extension part 221 of the fixed shaft part 22. The oil adhering to and dripping from the cover member 10 (oil passing through the flow path R4) is guided to the adsorbent 6 along the inclined surface 2220.

[0048] In the above embodiment, the adsorbent 6 is disposed in the fixed part 2, but it may be disposed in the rotating part 3 at a position overlapping with the flow passage leaking from the bearings 51 and 52.

[0049] In addition, the adsorbent 6 may be provided so as to be movable in the circumferential direction relative to the fixed part 2, so that when oil is adsorbed in a part of the adsorbent 6, rather than replacing the entire adsorbent 6, the adsorbent may be shifted in the circumferential direction so that the oil is adsorbed in a part where no oil has been adsorbed or where only a small amount of oil has been adsorbed.

[0050] Furthermore, the adsorbent 6 may be configured to be annular and have a radial dimension that changes by expansion and contraction like a rubber band, so that it can be elastically fitted into the recess 222 of the fixed shaft portion 22. [Explanation of symbols]

[0051] 1...hoisting machine, 2...fixed portion, 3...rotating portion, 5...bearing, 6...adsorbent material, 7...collecting portion, 10...cover member, 13...encoder, 15...end member, 21...fixed side main body portion, 22...fixed shaft portion, 31...cylindrical portion, 32...plate portion, 33...rotor, 33A...permanent magnet, 51...bearing, 51...first bearing, 52...second bearing, 71...flat surface, 72...inclined surface, 93...annular portion, 101...front plate portion, 101A...connecting portion, 102...cylindrical portion, 102B...inner peripheral surface, 103...annular portion, 151B...outer annular wall portion, 151G...outer peripheral surface, 211...first cylindrical portion, 212...first peripheral wall portion, 2 13...Second cylindrical portion (stator), 213M...coil, 214...second circumferential wall portion, 215...third cylindrical portion, 216...leg portion, 220...shaft portion main body, 221...shaft portion extension portion, 222...recess, 1211...first circumferential wall portion, 1212...first cylindrical portion, 1213...second circumferential wall portion, 1214...second cylindrical portion (stator), 1214M...coil, 1215...upper wall portion, 1216...lower wall portion, 1217...leg portion, 2220...inclined surface, A...object, B...braking portion, B1...bolt, B3...screw, H...observation hole, R1, R2, R3, R4...flow path, S...oil seal, X...rotation center axis

Claims

1. a rotating portion having a sheave; a fixed portion that supports the rotating portion; a bearing provided between the rotating part and the fixed part; an absorbent material disposed in a flow path of oil leaking from the bearing; The adsorbent is in the form of a sheet whose thickness direction coincides with the radial direction, and whose appearance changes when it absorbs oil, an observation hole through which the radially facing surface of the adsorbent can be seen from outside the hoist; the observation hole extends parallel to the rotation central axis of the rotating part, An elevator hoist, wherein the direction of the observer's line of sight when visually checking the adsorption material is oblique to the rotation central axis, and the observation hole is configured to ensure the line of sight.

2. The elevator hoist according to claim 1 , wherein the adsorption material is annular and provided around the rotation center of the rotating part.

3. 3. The elevator hoist according to claim 1, wherein a collecting section for collecting oil is provided in a portion of the rotating section or the fixed section that faces the adsorbent in the vertical direction.

4. A rotating part having a sheave; a fixed portion that supports the rotating portion; a bearing provided between the rotating part and the fixed part; an absorbent material disposed in a flow path of oil leaking from the bearing; The adsorbent is in the form of a sheet whose thickness direction coincides with the radial direction, and whose appearance changes when it absorbs oil, an observation hole through which the radially facing surface of the adsorbent can be seen from outside the hoist; the fixed portion includes a fixed-side main body portion that is fixed to an installation surface, and a hollow fixed shaft portion that extends from a substantially central portion of the fixed-side main body portion in the up-down direction to one side in the axial direction, The fixed shaft portion includes a cylindrical shaft main body and a shaft extension portion extending further forward from a front end of the shaft main body, A recess recessed radially inward is provided at a radially outer end of the shaft extension, the recess is provided continuously around the rotational axis of the rotating part, a front end portion of the recessed portion is defined by an inclined surface that is inclined so as to approach the rotation central axis of the rotating portion toward the rear side, The adsorption material is disposed in the recess.

5. A rotating part having a sheave; a fixed portion that supports the rotating portion; a bearing provided between the rotating part and the fixed part; an absorbent material disposed in a flow path of oil leaking from the bearing; The adsorbent is in the form of a sheet whose thickness direction coincides with the radial direction, and whose appearance changes when it absorbs oil, an observation hole through which the radially facing surface of the adsorbent can be seen from outside the hoist; a collecting section that collects oil is provided in a portion of the rotating section or the fixed section that faces the adsorbent in the vertical direction, The cross-sectional shape of the collecting portion is a tapered protrusion that protrudes toward the adsorption material and has a narrower width on the protruding side.

Images