WO2021117232A1

WO2021117232A1 - Suspension body, method for producing suspension body, method for assembling elevator, and elevator

Info

Publication number: WO2021117232A1
Application number: PCT/JP2019/048988
Authority: WO
Inventors: 晋也内藤; 田中　直也; 治彦角谷
Original assignee: 三菱電機株式会社
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2021-06-17
Also published as: CN114787067A; CN114787067B; JP6756420B1; JPWO2021117232A1

Abstract

In a suspension body that withstands the load of an elevator, etc., there is a concern that when a load support part provided to the suspension body is compressed, cracks could form in the load support part in association with suspension-body-width-direction deformation of an outer layer part covering the load support part.　According to the present invention, a suspension body (1) is provided with: a belt-form load support part (3) formed from fiber-reinforced plastic; and an outer layer part (4) covering the load support part (3), the outer layer part (4) being formed from a flexible resin, having a sandwiched part (6) that is sandwiched by a body part and a securing implement, and being such that the thickness of the sandwiched part (6) is less than the thickness of the body part (5). This mitigates deformation of the outer layer part (4) and makes it possible to suppress the formation of cracks in the load suspension part (3) while ensuring durability of the outer layer part (4) with respect to wear.

Description

Suspension body, manufacturing method of suspension body, assembly method of elevator, and elevator

This disclosure relates to a suspension body and an elevator using the suspension body.

The car provided in the elevator is hung by a rope or the like. In recent years, a lightweight and durable suspension body has been developed in which fiber reinforced plastic (FRP: Fiber Reinforced Plastics) is used for the load supporting portion and the periphery thereof is covered with a flexible outer layer portion (see, for example, Patent Document 1).

Special Table 2011-509899

However, if the thickness of the load support portion is reduced in response to the miniaturization of the hoisting machine of the elevator and the sheave of the hoisting machine, the load support portion may be cracked due to the pressure from the fixture that fixes the suspension body. There was a problem.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a suspension body capable of suppressing cracks in a load supporting portion.

The suspension body according to the present disclosure has a belt-shaped load support portion made of fiber reinforced plastic and a holding portion that covers the load support portion and is formed of a flexible resin and is sandwiched by a main body portion and a fixture. It is provided with an outer layer portion in which the thickness of the sandwiching portion is thinner than the thickness of the main body portion.

Further, in the method for manufacturing a suspended body according to the present disclosure, a belt-shaped load supporting portion is formed by molding an impregnated body in which reinforcing fibers are impregnated with a matrix resin containing at least one of a thermoplastic resin and a thermosetting resin. The load support part forming step, the outer layer resin forming step of forming the outer layer resin covering the load support part by thermosetting and then solidifying the flexible resin, and the part sandwiched by the fixture of the outer layer resin. Is provided with a sandwiching portion forming step of cutting the plastic to partially thin it or heating it to a temperature higher than the thermal deformation temperature and pressing it to thin it to form a sandwiching portion.

Further, in the method of assembling an elevator according to the present disclosure, a part of an outer layer resin formed of a flexible resin covering a belt-shaped load support portion made of fiber reinforced plastic is partially cut. The process of making the suspension body by thinning or heating it to a temperature higher than the thermal deformation temperature and pressing it to make it thinner to form a holding portion to be sandwiched by the fixture, and sandwiching the sandwiched portion of the suspension with the fixture. The suspension body is provided with a step of fixing the suspension body to a balance weight that balances with the car and a step of winding the suspension body around a drive sheave that raises and lowers the car and the balance weight on a hoistway.

Further, the elevator according to the present disclosure is provided with a drive sheave, a hoist for rotating the drive sheave, a suspension body according to the present disclosure wound around the drive sheave, and a fixture for sandwiching the holding portion of the suspension body. It is equipped with a cage that is fixed and moves up and down by the rotation of the drive sheave.

According to the present disclosure, it is possible to suppress the occurrence of cracks in the load support portion provided on the suspension body.

It is explanatory drawing about the occurrence of the crack which concerns on Embodiment 1. FIG. FIG. 5 is a relationship diagram showing the relationship between the compressive stress and the amount of compression of the suspension body according to the first embodiment. It is a side view of the suspension body which concerns on Embodiment 1. FIG. It is a cross-sectional view of AA in FIG. 1 of the suspension body which concerns on Embodiment 1. FIG. It is a BB sectional view in FIG. 1 of the suspension body which concerns on Embodiment 1. FIG. It is an enlarged sectional view of the load support part of the suspension body which concerns on Embodiment 1. FIG. It is a schematic diagram of the elevator using the suspension body which concerns on Embodiment 1. FIG. It is a schematic diagram of the fixture which concerns on Embodiment 1. FIG. It is a side view of the suspension body which concerns on Embodiment 2. FIG. 9 is a cross-sectional view of CC in FIG. 9 of the suspension body according to the second embodiment. It is a DD sectional view in FIG. 9 of the suspension body which concerns on Embodiment 2. FIG. 9 is a cross-sectional view taken along the line EE in FIG. 9 of the suspension body according to the second embodiment. It is a side view of the suspension body which concerns on Embodiment 3. FIG. It is FF sectional view in FIG. 13 of the suspension body which concerns on Embodiment 3. FIG. It is a GG sectional view in FIG. 13 of the suspension body which concerns on Embodiment 3. FIG.

Embodiment 1.
When the suspension body is sandwiched and pressed by the fixture to suspend the elevator car, a force is applied to the load support portion formed of the FRP of the suspension body, and a force is also applied to the outer layer portion covering the load support portion. When the outer layer portion is a flexible resin, the resin is deformed outward in the width direction of the suspension body. The effect of this deformation on the load bearing was investigated.

FIG. 1 is an explanatory view of the occurrence of cracks, FIG. 1 (a) is a schematic cross-sectional view in a state where the suspension body is not pressed by the fixture 2, and FIG. 1 (b) is a fixed cross-sectional view. It is sectional drawing which is the state pressed by the tool 2.

The suspension body can cover a belt-shaped load support portion 3 composed of FRP in which reinforcing fibers having tensile strength in the longitudinal direction are impregnated with, for example, a matrix resin which is a thermosetting resin, and the load support portion 3. It is composed of an outer layer 44 having flexibility. When the suspension body is pressed by the fixture 2, the outer layer 44 of the pressed portion is deformed to become thinner, and a part thereof is extruded in the width direction (state of FIG. 1B). The belt-shaped FRP constituting the load support portion 3 has a strong tensile strength in the longitudinal direction, but in the width direction, if the reinforcing fibers constituting the FRP of the load support portion 3 and the matrix resin are peeled off, vertical cracks occur. (Crack) may occur. Therefore, the outward deformation of the outer layer 44 in the width direction causes a problem because the load supporting portion 3 in contact with the outer layer 44 is pulled in the width direction.

Therefore, the inventors considered that it was necessary to reduce the amount of deformation due to the pressing of the outer layer 44 by the fixture 2. On the other hand, the outer layer 44 of the suspension body needs to be thick in order to secure durability against wear due to contact with the drive sheave 14 or the like around which the suspension body is wound.

Then, as a result of diligently examining means for securing the thickness and suppressing cracks, the thickness of the outer layer 44 covering the portion pressed by the fixture 2 of the load support portion 3 is determined by the portion pressed by the fixture 2. It has been found that cracks in the load supporting portion 3 of the suspension body can be suppressed by making the thickness thinner than the thickness of the outer layer 44 that covers the parts other than the above. This will be described below.

(Compression test)
In order to verify the effect of suppressing cracks in the load bearing portion 3 by reducing the thickness of the outer layer 44, samples A and B having different outer layer thicknesses were subjected to compression tests and compared.

The relationship between compressive stress and compressive amount was investigated using two types of samples with different outer layer thicknesses. In each sample, a load support portion 3 composed of FRP having a thickness of 1.6 mm, a width of 35 mm, and a length of 40 mm is used, and the outer layer thickness of sample A is 0.7 mm and the outer layer thickness of sample B is 2.1 mm. The sample was prepared. The total thickness of sample A is 3.0 mm, and the total thickness of sample B is 5.8 mm. Here, carbon fiber and epoxy resin were used for the load-bearing portion 3 of each sample, and ether-based thermoplastic polyurethane elastomer was used for the outer layer of each sample. The thickness of the outer layer other than the portion sandwiched between the fixtures 2 is generally set to a thickness that can withstand the wear caused by the contact with the drive sheave 14 or the like in order to secure the durability against the wear of the suspension body. However, in this test, the outer layer thickness of sample B is further increased in order to increase the amount of compression.

The vertical axis of FIG. 2 is the compressive stress obtained by dividing the load during the compression test by the area of the test piece, and the horizontal axis is the amount of compression. In sample A, even when compressed to a stress equal to or higher than that of the 2.1 mm test piece, no noise was introduced in the compressive stress, and no crack was confirmed in the load support portion 3. On the other hand, in sample B, when the compression amounts were about 2.6 mm and about 3.4 mm, noise was introduced into the compressive stress and cracks were generated in the load support portion 3.

That is, according to this principle, if the outer layer thickness is reduced at the end of the suspension body pressed by the fixture 2, the amount of deformation of the flexible resin is suppressed, and the force that pulls the load support portion 3 is reduced to crack. Can be suppressed.

Hereinafter, the suspension body 1 of the embodiment will be described based on the drawings. FIG. 3 is a side view of the suspension body 1 according to the first embodiment. The suspension body 1 includes a belt-shaped load support portion 3 that is continuous in parallel with the longitudinal direction of the suspension body 1, and an outer layer portion 4 made of a flexible resin that covers the load support portion 3. Here, the belt shape means a shape extending in a belt shape. The x-axis, y-axis, and z-axis are orthogonal to each other, and in the embodiment, the x-axis is the longitudinal direction, the y-axis is the width direction, and the z-axis is the thickness direction.

The load support portion 3 of the suspension body 1 shown by the broken line in FIG. 3 is composed of a main portion that is not pressed by the fixture 2 and an end portion that is pressed by the fixture 2.

Here, the main part and the end part each have substantially the same cross section in the longitudinal direction. That is, the main portion and the end portion are integrated, and in the example of FIG. 3, there are end portions pressed by the fixture 2 at both ends of the main portion of the load support portion 3. Further, since the length of contact between the fixture 2 and the suspension body 1 is about 0.2 m, the length of the end portion in the longitudinal direction is at least 0.2 m or more.

The load support portion 3 is formed of FRP formed by impregnating a plurality of reinforcing fibers 7 which are strong against tension in the longitudinal direction, for example, which are continuous in parallel in the longitudinal direction, with a matrix resin 8. In this way, even a heavy one can be supported by the load supporting portion 3.

The outer layer portion 4 that covers the load supporting portion 3 has a main body portion 5 that covers the main portion and a holding portion 6 that covers the end portions, and is a cross-sectional view including the main body portion 5 of the suspension body 1 in FIGS. As shown in the cross-sectional view including the portion 6, the thickness t2 of the sandwiching portion 6 is formed to be thinner than the thickness t1 of the main body portion 5.

Here, the thickness t2 of the sandwiching portion 6 is secured to a thickness that does not damage the load supporting portion 3 when sandwiched by the fixture 2. Then, in order to reduce the amount of deformation due to pressing, the thickness t2 of the sandwiching portion 6 is reduced. The thickness t1 of the main body portion 5 is formed to be thicker than the holding portion 6 in order to prevent the load supporting portion 3 from being exposed due to wear due to contact between the main body portion 5 and, for example, the drive sheave 14.

Further, it is preferable that the thickness of the sandwiching portion 6 is about the same on both sides sandwiched by the fixture 2. In this way, it is possible to prevent the compressive force from the fixture 2 from being biased to one side.

In order to confirm that the cracking of the load supporting portion 3 can be suppressed by thinning the sandwiching portion 6, a tensile test was performed on a sample in which the thickness tf of the load supporting portion 3 and the thickness t2 of the sandwiching portion 6 were changed. In the samples of Examples 1 to 10 and Comparative Examples 1 to 6, a load support portion 3 was prepared using carbon fiber as the reinforcing fiber 7 and an epoxy resin as the matrix resin 8, and ether was used as the resin covering the load support portion 3. The sandwiching portion 6 was produced using a thermoplastic polyurethane elastomer (hardness 90A) of the system. Further, in each sample, the load supporting portion 3 has a length of 1 m and a width of 35 mm, and the holding portion 6 has a length of 0.25 m and is provided at both ends of the sample.

The tensile test was carried out by sandwiching the holding portions 6 provided at both ends of the sample with a wedge-type fixture 2 having a gripping length of 0.2 m and applying a tensile load.

Whether or not a crack has occurred is determined by determining that a crack has occurred in the load support portion 3 at a load lower than that of the entire sample breaking during the tensile test, and the load support portion 3 has a crack before the entire sample breaks. Those without cracks were judged to have no cracks.

Table 1 shows the presence or absence of cracks in each sample. When the thickness ratio t2 / tf of the thickness tf of the load supporting portion 3 and the thickness t2 of the sandwiching portion 6 is 100% or more (Comparative Examples 1 to 6), a crack occurs in the load supporting portion and the thickness ratio t2 / tf becomes When it is 85% or less (Examples 1 to 10), it can be seen that cracks do not occur.

In this way, in the outer layer portion 4 that covers the load support portion 3, the thickness of the main body portion 5 that is worn is set to a thickness that can withstand the wear due to contact with the drive sheave 14, and the holding portion 6 that is deformed by pressing. By making the thickness of the suspension body 1 thinner than that of the main body 5, it is possible to suppress cracks in the load support portion 3 while ensuring durability against wear of the suspension body 1.

Then, when the thickness of the holding portion 6 is thinner than the thickness of the main body portion 5 and is 85% or less of the thickness of the load supporting portion 3, cracks in the load supporting portion 3 can be further suppressed.

Next, each configuration of the suspension body 1 will be described. The load support portion 3 is formed by an FRP in which the reinforcing fibers 7 are arranged substantially parallel to the longitudinal direction of the suspension body 1. Here, it is preferable that the reinforcing fibers 7 are arranged in parallel with each other without twisting.

FIG. 6 is an enlarged cross-sectional view of the load supporting portion 3 in the suspension body 1 according to the first embodiment. In FIG. 6, the load support portion 3 is composed of the matrix resin 8 and the reinforcing fibers 7, and is formed by impregnating the reinforcing fibers 7 with the matrix resin 8.

As the reinforcing fiber 7 constituting the load supporting portion 3, it is preferable to use carbon fiber capable of ensuring strength. Further, as long as it is a lightweight and high-strength fiber, for example, a fiber such as a glass fiber, an aramid fiber, a polyarylate fiber, or a polyparaphenylene benzobisoxazole fiber may be used as the reinforcing fiber 7. Here, one of these fibers may be used as the reinforcing fiber 7, or two or more types may be used in combination as the reinforcing fiber 7.

Further, the volume content of the reinforcing fibers, which indicates the ratio of the volume occupied by the reinforcing fibers 7, is preferably about 50% to 70% with respect to the total volume of FRP. In this way, the load supporting portion 3 can be easily formed, and the reinforcing effect of the reinforcing fibers 7 can be obtained.

A thermosetting resin or a thermoplastic resin is used as the matrix resin 8 constituting the load supporting portion 3. The thermosetting resin is a resin obtained by adding a curing agent to a main agent such as an epoxy resin, a polyurethane resin, an unsaturated polyester resin, a vinyl ester resin, or a phenol resin, and the thermoplastic resin is, for example, polyurethane, polyamide 6, or polyamide. 12. Resin such as polyamide 66. Further, one of these resins may be used as the matrix resin 8, or two or more of these resins may be combined and used as the matrix resin 8. Further, the matrix resin 8 may contain additives such as a flame retardant and a mold release agent. The matrix resin 8 is preferably an epoxy resin because of its high adhesive strength.

Next, the outer layer portion 4 that covers the load support portion 3 will be described. For the outer layer portion 4, a flexible resin such as a thermoplastic elastomer is used. In order to secure durability against abrasion, the material constituting the outer layer portion 4 is preferably a thermoplastic polyurethane elastomer, and more preferably an ether-based thermoplastic polyurethane elastomer. Since the ether-based thermoplastic polyurethane elastomer has excellent hydrolysis resistance in a high-temperature and high-humidity environment, deterioration of the outer layer portion 4 due to the usage environment can be suppressed. Here, the ether system means that an ether bond is contained in the composition.

Further, the outer layer portion 4 may be made of a material that can secure friction and has excellent wear resistance. For example, an olefin-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a vinyl chloride-based thermoplastic elastomer, and a polyester-based thermoplastic elastomer. Elastomers, polyamide-based thermoplastic elastomers, and the like may be used. The resin forming the outer layer portion 4 may contain a flame retardant, a cross-linking agent, or the like.

Next, an example in which the suspension body 1 of the present embodiment is used as the suspension body 1 for suspending the car 10 of the elevator 9 will be described. FIG. 7 is a schematic view of the elevator 9 according to the first embodiment. In the elevator 9, the suspension body 1, the fixture 2 that sandwiches and fixes the end portion of the suspension body 1, the car 10 having the frame 11 suspended by the suspension body 1, and the suspension body 1 are wound around. The drive sheave 14 and a hoisting machine that rotates the drive sheave 14 to wind up the suspension body 1 and raise and lower the car 10 are provided.

Further, a counterweight 12 is suspended via a fixture 2 on the side of the suspension body 1 opposite to the side on which the car 10 is suspended, and the counterweight 12 is lifted and lowered by the deflecting wheel 13. Suspended so as not to come into contact with. The hoisting machine motor and hoisting machine brake included in the hoisting machine rotate and brake the drive sheave 14 around which the suspension body 1 is wound, so that the car 10 and the balance weight 12 move through the hoistway 15. Go up and down and stop. Here, the elevating and lowering of the balance weight 12 with the car 10 is controlled by the control device 17 provided in the machine room 16 provided in the upper part of the hoistway 15 in the example of FIG.

The suspension body 1 included in the elevator 9 is composed of a load support portion 3 having strength in the vertical direction in FIG. 7, that is, a tensile direction in the longitudinal direction of the suspension body 1, and an outer layer portion 4 covering the periphery of the load support portion 3. It is formed. In the suspension body 1, the holding portion 6 is sandwiched by the fixing tool 2, and the car 10 is suspended via the fixing tool 2.

FIG. 8 shows an example of the fixture 2 that sandwiches the suspension body 1. The fixture 2 includes, for example, a socket 18 and a wedge 19, and the suspension body 1 is inserted into the socket 18 and a force is applied to the end of the suspension body 1 in the thickness direction of the suspension body 1 by driving the wedge 19. The suspension body 1 is sandwiched. Further, as in the example shown in FIG. 8, the end portion of the suspension body 1 may be gripped by the stopper 20. When the suspension body 1 is gripped by the stopper 20, it is possible to prevent the suspension body 1 from slipping between the suspension body 1 and the fixture 2 and the suspension body 1 from falling out of the fixture 2.

In this way, in the suspension body 1 sandwiched by the fixture 2, the thickness of the belt-shaped load support portion 3 formed of FRP and the sandwich portion 6 sandwiched by the fixture 2 is set from the thickness of the main body portion 5. By providing an outer layer portion 4 that covers the load supporting portion 3 made of a thin and flexible resin, cracks in the load supporting portion 3 can be suppressed.

Next, the manufacturing method of the suspension body 1 according to the first embodiment will be described.

First, the matrix resin 8 is prepared by mixing the base resin that is the base of the matrix resin 8 with the curing agent, additives, etc. used as needed.

Next, the reinforcing fiber 7 is impregnated with the matrix resin 8, and the impregnated body is formed into a belt shape by, for example, drawing molding to form the load support portion 3 (load support portion forming step).

Next, the flexible outer layer resin is heated to a temperature above the heat flow temperature (hereinafter referred to as the heat flow temperature), and the load support portion 3 is continuously covered with the heat flow outer layer resin, for example, by extrusion coating. To do. The heat-fluidized outer layer resin is solidified by a method such as water cooling or air cooling to obtain a continuum in which the load supporting portion 3 is coated with the solidified outer layer resin (outer layer resin forming step). Here, water cooling and air cooling include not only cooling the outer layer resin by circulating cooling water and air, but also exposing the outer layer resin to outside air and the like.

Further, after forming the continuum, the thickness of the outer layer resin covering the end portion pressed by the fixture 2 of the load support portion 3 is reduced, and the outer layer portion having the main body portion 5 and the sandwiching portion 6 having different thicknesses. Form 4. The outer layer resin is cut by a milling machine or the like, and the outer layer resin is thinned in parallel with the surface over a length of about 0.2 m to form a sandwiching portion 6 (pinching portion forming step) to obtain an outer layer portion 4.

Further, in another method of forming the sandwiching portion 6, the outer layer resin covering the end portion is pressed by pressing the outer layer resin covering the end portion in a state of being heated to a temperature higher than the temperature at which the outer layer resin covering the end portion is thermally deformed (hereinafter referred to as the thermal deformation temperature). The thickness of the outer layer resin covering the portion is made thinner than the thickness of the outer layer resin covering the main portion. Here, when pressing is performed using a spacer formed of, for example, a metal whose target thickness is a dimension, the thickness can be adjusted more easily. In this way, the outer layer portion 4 having the main body portion 5 and the sandwiching portion 6 can be formed, and the suspension body 1 can be manufactured.

Further, if the outer layer portion 4 expands in the width direction and becomes partially wide after the holding portion 6 is formed by pressing, the excess portion may be cut in a later step. Further, in the step of forming the sandwiching portion 6, an example in which the sandwiching portion 6 is thinned in parallel has been described, but the thinned portion may not be parallel and a partially thick portion may remain in the sandwiching portion 6.

That is, an impregnated body in which the reinforcing fibers 7 are impregnated with a matrix resin 8 containing a thermoplastic resin, a thermosetting resin, or both is formed to form a continuous load support portion 3 in a belt shape. Then, it is coated with a flexible outer layer resin heated to a heat flow temperature or higher and solidified. Further, the outer layer resin of the portion covering the end portion of the load supporting portion 3 is partially thinned by cutting or heated to a temperature higher than the thermal deformation temperature and pressed, and partially thinned and sandwiched between the fixtures 2. The sandwiching portion 6 is formed. In this way, it is possible to obtain the suspension body 1 capable of suppressing the generation of cracks due to the pressing from the fixture 2.

Next, a method of assembling the elevator 9 using the suspension body 1 according to the present embodiment will be described.

First, a continuum cut to a required length is prepared, which has a belt-shaped load support portion 3 formed of FRP and an outer layer resin formed of a flexible resin that covers the load support portion 3. To do. Next, the portion sandwiched by the fixture 2 of the outer layer resin is partially thinned by cutting or heated to a temperature higher than the thermal deformation temperature and pressed to partially thin the portion sandwiched by the fixture 2. The portion 6 is formed to obtain the suspension body 1. Next, the suspension body 1 is connected to the car 10 and the counterweight 12 via the fixture 2. Then, the suspension body 1 is wound around the drive sheave 14 so that the car 10 and the counterweight 12 can move up and down the hoistway 15 by the rotation of the hoisting machine.

In this way, the suspension body 1 can be sandwiched by the fixture 2, and the car 10 and the counterweight 12 can be suspended by the suspension body 1 from the hoistway 15 of the elevator 9 to assemble the elevator 9.

An example in which a continuous body composed of FRP and an outer layer resin is prepared, a suspension body 1 having a holding portion 6 is manufactured at the site, and an elevator 9 is assembled has been described. However, a holding portion manufactured at a factory or the like has been described. The elevator 9 may be assembled using the suspension body 1 provided with the 6.

Embodiment 2.
FIG. 9 is a side view of the suspension body 1 according to the second embodiment. Similar to the first embodiment, the suspension body 1 according to the second embodiment has a belt-shaped load support portion 3 formed of FRP and an end portion pressed by the fixture 2 rather than the thickness covering the main portion. The outer layer portion 4 having a thin covering thickness is provided. In the second embodiment, the thickness of the outer layer portion 4 at the end of the suspension body 1 gripped by the fixture 2 is thinner than the thickness of the outer layer portion 4 at the main portion of the suspension body 1, and further. The difference is that the sandwiching portion 6 is provided with a locking portion 21 that continuously locks the fixture 2. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

10, 11, and 12 are a CC sectional view, a DD sectional view, and an EE sectional view of FIG. 9, respectively. Here, FIG. 10 is a cross-sectional view including the main body portion, FIG. 11 is a cross-sectional view including the sandwiching portion, and FIG. 12 is a cross-sectional view including the sandwiching portion.

The locking portion 21 is provided adjacent to the holding portion 6 on the opposite side of the main body portion 5 so as to lock the fixture 2. The locking portion 21 is provided so as to be in contact with the fixture 2, and the thickness t3 of the locking portion 21 is t2 <between the thickness t1 of the main body portion 5 and the thickness t2 of the sandwiching portion 6. It has a relationship of t3 ≦ t1. The length of the locking portion 21 in the longitudinal direction is 30 mm or more, preferably 50 mm or more. In this way, even if a load in the tensile direction is applied to the suspension body 1, the displacement of the fixture 2 in the longitudinal direction can be suppressed. Since the locking portion 21 is not sandwiched by the fixture 2, it is not pressed in the thickness direction, and there is no effect on the occurrence of cracks due to the increase in thickness.

Next, the manufacturing method of the suspension body 1 according to the second embodiment will be described. As the method for manufacturing the suspension body 1 of the second embodiment, the same method as that described in the first embodiment can be used until the step of obtaining the continuum in which the load supporting portion 3 is coated with the outer layer resin.

After forming the continuum, the thickness of the outer layer resin covering the end pressed by the fixture 2 is reduced to form the outer layer portion 4 having the main body portion 5 and the sandwiching portion 6 having different thicknesses. As a method of reducing the thickness of the outer layer resin, for example, cutting with a milling machine or the like is used. The outer layer resin is thinned in parallel with the surface for about 0.2 m, and at the same time, a locking portion 21 having a length of about 30 mm is provided continuously with the sandwiching portion 6.

The locking portion 21 is formed to exceed the thickness of the holding portion 6 and to be less than or equal to the thickness of the main body portion 5. That is, the locking portion 21 is formed by making the cutting amount of the outer layer resin covering the load supporting portion 3, for example, the tip side smaller than that of the sandwiching portion 6 in the step of forming the sandwiching portion 6. Here, a small amount of cutting includes not being cut. In this way, the main body portion 5 that covers the main portion, the holding portion 6 that is formed thinner than the main body portion 5 by cutting, and the cutting amount that is smaller than that of the holding portion 6 are continuously provided in the holding portion 6. An outer layer portion 4 having the locked locking portion 21 is obtained.

The suspension body 1 thus obtained is provided with a locking portion 21 which is continuous with the sandwiching portion 6 and is thicker than the thickness of the sandwiching portion 6 sandwiched by the fixture 2. The displacement of the fixture 2 in the longitudinal direction can be suppressed.

In the present embodiment, it has been described that the sandwiching portion 6 is formed by cutting, but as described in the first embodiment, the outer layer resin is partially heated and pressed to a temperature higher than the thermal deformation temperature. The sandwiching portion 6 may be formed by making it thin. In this case, a locking portion can be obtained by adjusting the pressing amount using, for example, a mold so as to continuously form a portion thicker than the sandwiching portion 6 in the sandwiching portion 6.

Embodiment 3.
FIG. 13 is a side view of the suspension body 1 according to the third embodiment. Similar to the first embodiment, the suspension body 1 according to the third embodiment has a belt-shaped load support portion 3 formed of FRP and an end portion pressed by the fixture 2 rather than the thickness covering the main portion. The outer layer portion 4 having a thin covering thickness is provided. The third embodiment is different in that the outer layer portion 4 is formed of a plurality of resin layers. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

14 and 15 are an FF sectional view and a GG sectional view of FIG. 13, respectively. As shown in FIG. 14, the main body portion 5 that covers the main portion of the load support portion 3 is formed by a first coating layer 22 that covers the main portion and a second coating layer 23 that covers the first coating layer 22. Further, as shown in FIG. 15, the holding portion 6 covering the end portion of the load supporting portion 3 is formed by the third coating layer 24 covering the end portion exposed from the fourth coating layer 25. Here, the first coating layer 22 and the third coating layer 24 are continuums having substantially the same cross section in the longitudinal direction.

Further, as shown in FIG. 15, the third coating layer 24 is exposed from the fourth coating layer 25 on the surface in contact with the fixture 2. Further, the first coating layer 22 and the third coating layer 24 have different colors from the second coating layer 23 and the fourth coating layer 25, so that they can be visually distinguished. The fourth coating layer 25 is removed by cutting in the manufacturing process of the suspension body 1, and the total thickness of the first coating layer 22 and the second coating layer 23 becomes the thickness t1 of the main body portion 5, and the third coating layer 24 Is the thickness t2 of the sandwiching portion 6. Further, if the third coating layer 24 is exposed on the surface in contact with the fixture 2, the fourth coating layer 25 may remain without being removed in the width direction of the sandwiching portion 6. Here, color includes transparency.

That is, the suspension body 1 of the present embodiment includes the outer layer portion 4 having the main body portion 5 and the holding portion 6, and the color of the outermost layer of the main body portion 5 and the surface of the holding portion 6 in contact with the fixture 2. The color of the outermost layer is different. In this way, it is possible to prevent the end portion from being exposed from the sandwiching portion 6 in the step of reducing the thickness of the resin by cutting at the time of forming the sandwiching portion 6, and the sandwiching portion 6 is formed in the sandwiching portion forming step. Since it is possible to grasp how thin the outer layer resin of the portion to be formed should be, the formation becomes easy.

Next, the manufacturing method of the suspension body 1 according to the present embodiment will be described. As the method for manufacturing the suspension body 1 of the present embodiment, the same method as that described in the first embodiment can be used up to the step of obtaining the load support portion 3 formed in a belt shape.

After obtaining the load-bearing portion 3, the flexible resin is thermally fluidized and then solidified by a method such as water cooling or air cooling to form a first resin layer composed of a first coating layer 22 and a third coating layer 24. Covers the load support portion 3 with. Next, the first resin layer is covered with a second resin layer composed of a second coating layer 23 and a fourth coating layer 25, which are different in color from the first resin layer.

Further, after forming the second resin layer covering the first resin layer, the thickness of the resin covering the portion pressed by the fixture 2 is reduced, and the outer layer having the main body portion 5 and the sandwiching portion 6 having different thicknesses. Part 4 is formed. At this time, the method of reducing the thickness of the outer layer resin is, for example, cutting with a milling machine or the like. The outer layer resin is thinned parallel to the surface over a length of about 0.2 m until the first resin layer is exposed to form the sandwiching portion 6.

When the suspension body 1 is manufactured in this way, the outer layer portion 4 of the suspension body 1 is formed of a plurality of layers having different colors, so that the thickness of the outer layer resin at the time of forming the holding portion 6 is reduced. It is possible to prevent the load supporting portion 3 from being exposed, and further, it is possible to suppress damage to the load supporting portion 3 due to excessive cutting.

In the present embodiment, the case where the outer layer portion 4 is formed by two layers has been described, but when a more multi-step guideline is required in the step of forming the sandwiching portion 6, a resin having three or more layers. The load support portion 3 may be covered with the above layer so that the colors are different between the layers. In this way, for example, if processing is performed while detecting a change in color with a sensor, the accuracy of forming the sandwiching portion 6 is improved.

In the first to third embodiments, the example in which the end portion of the suspension body 1 is fixed by the fixture 2 has been described, but when the fixture 2 is attached to a portion other than the end portion of the suspension body 1, another method is used. The portion may be thinned to provide the sandwiching portion 6.

Further, in the first to third embodiments, the suspension body 1 is used as the belt of the elevator 9, but one end is sandwiched by the fixture 2 and a tensile force is generated at both ends, for example, a crane belt. It is also possible to apply the suspension body 1 to the above.

Further, the embodiments disclosed in the present specification can be freely combined with each embodiment within the scope of the embodiments, and the embodiments can be appropriately modified or omitted. ..

1 Suspension body, 2 Fixture, 3 Load support part, 4 Outer layer part, 5 Main body part, 6 Holding part, 7 Reinforcing fiber, 8 Matrix resin, 9 Elevator, 10 basket, 11 frame, 12 Balance weight, 13 Saw wheel, 14 drive sheave, 15 hoistway, 16 machine room, 17 control device, 18 socket, 19 wedge, 20 stopper, 21 locking part, 22 1st coating layer, 23 2nd coating layer, 24 3rd coating layer, 25th 4 coating layer, 44 outer layer

Claims

A belt-shaped load support made of fiber reinforced plastic and
An outer layer portion that covers the load supporting portion, is formed of a flexible resin, has a holding portion that is sandwiched by a main body portion and a fixture, and the thickness of the sandwiching portion is thinner than the thickness of the main body portion. Suspension body equipped.
The suspension body according to claim 1, wherein the thickness of the holding portion is 85% or less of the thickness of the load supporting portion.
It is provided on the opposite side of the main body portion adjacent to the holding portion, and includes a locking portion for locking the fixture.
The suspension body according to claim 1 or 2, wherein the thickness of the locking portion exceeds the thickness of the sandwiching portion and is equal to or less than the thickness of the main body portion.
The suspension body according to any one of claims 1 to 3, wherein the outermost layer of the sandwiching portion has a color different from that of the outermost layer of the main body portion.
The fiber-reinforced plastic is composed of carbon fibers extending in the longitudinal direction of the load-bearing portion and an epoxy resin impregnated with the carbon fibers.
The suspension body according to any one of claims 1 to 4, wherein the volume content of the carbon fibers occupying the fiber reinforced plastic is 50% or more and 70% or less.
The suspension body according to any one of claims 1 to 5, wherein the outer layer portion is a thermoplastic elastomer containing an ether bond.
A load support portion forming step of forming a belt-shaped load support portion by molding an impregnated body in which reinforcing fibers are impregnated with a matrix resin containing at least one of a thermoplastic resin and a thermosetting resin.
An outer layer resin forming step of forming an outer layer resin covering the load-bearing portion by heat-fluidizing and then solidifying the flexible resin.
Suspension provided with a sandwiching portion forming step of cutting and partially thinning the portion sandwiched by the outer layer resin fixture or heating the portion to a temperature higher than the thermal deformation temperature and pressing the portion to be thinned to form a sandwiching portion. How to make a body.
The suspension according to claim 7, wherein the sandwiching portion forming step forms a locking portion that is adjacent to the sandwiching portion together with the sandwiching portion and that locks the fixture that exceeds the thickness of the sandwiching portion. How to make a body.
In the outer layer resin forming step, the flexible resin is thermally fluidized and then solidified to cover the load-bearing portion to form a first resin layer, and a second resin having a color different from that of the first resin layer. Cover with a layer,
The production of the suspension body according to claim 7 or 8, wherein in the sandwiching portion forming step, the second resin layer is cut to expose the first resin layer to form the sandwiching portion. Method.
A part of the outer layer resin made of a flexible resin that covers the belt-shaped load bearing part made of fiber reinforced plastic is cut to partially thin it or heated to a temperature higher than the thermal deformation temperature and pressed. And thinning it, and the process of making a suspended body in which a holding part to be held by a fixture is formed,
A step of sandwiching the holding portion of the suspension body with the fixture and fixing the suspension body to a car and a counterweight that balances with the car.
A method for assembling an elevator, which comprises a step of winding the suspension body around a drive sheave that raises and lowers the car and the balance weight on a hoistway.
Drive sheave and
A hoist that rotates the drive sheave and
The suspension body according to any one of claims 1 to 6, which is wound around the drive sheave.
An elevator provided with a cage that is fixed by a fixture that sandwiches the holding portion of the suspension body and that moves up and down by the rotation of the drive sheave.