Construction elevator and construction elevator control method

Abstract

To provide a construction elevator and a construction elevator control method capable of automatically setting a lifting / lowering speed of a carriage.SOLUTION: A construction elevator comprises: an elevating part capable of elevating / lowering and having a storage space capable of storing transported objects; load signal detection means 40 capable of detecting a loading weight of the elevating part; and a control part 10 for acquiring the loading weight from the load signal detection means 40 and setting an elevating / lowering speed of the elevating part based on the loading weight. The construction elevator control method comprises: a weight acquisition process of acquiring the loading weight of the elevating part capable of storing the transported object; and a speed determination process of setting the elevating / lowering speed of the elevating part based on the loading weight.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a construction elevator and a control method for a construction elevator.

Background Art

[0002] Conventionally, there has been a rack-type construction elevator used at a construction site (for example, Patent Document 1). The rack-type construction elevator is supported by a lifting frame having a driving device and includes a carrier capable of carrying workers and construction materials and equipment. Pinion gears are respectively attached to the output shafts of a plurality of driving devices, and the pinion gears mesh with a rack attached to a guide rail. The rack-type construction elevator has a mechanism for raising and lowering the carrier by rotating the pinion gears. In the rack-type construction elevator, the carrier and the counterweight are connected by a rope via a top sheave, which plays an auxiliary role for the driving force of the driving device.

[0003] The greatest advantage of such a rack-type construction elevator is that it is possible to extend the hoistway by adding a guide rail in the vertical direction according to the progress of the construction. Also, when adding a guide rail, since the carrier itself has a lifting function, it is possible to stop the carrier at an arbitrary position, and the workability is high. Since the rack-type construction elevator has such advantages and a simple structure, it has high reliability and can be manufactured at low cost, and thus has become the mainstream as a construction elevator used at a construction site.

[0004] In addition, such a rack-type construction elevator is roughly classified into a single-column elevator having one guide rail as a hoistway and a double-column elevator that moves up and down along a pair of guide rails. The single-column elevator is often installed in an opening inside a building of a building and is often adopted in office-related construction work. The double-column elevator is used in the construction of small and medium-sized facilities installed outside a building and in the construction of apartment houses from medium-rise to super high-rise.

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Patent Application Laid-Open No. 08-277079 Summary of the Invention Problems to be Solved by the Invention

[0006] However, the operation of changing the lifting speed of a conventional rack-type construction elevator is often performed manually. For example, an operator operates a control panel installed on the ground and manually changes the input frequency of the electric motor to change the lifting speed. Therefore, there is a possibility that it takes time to change the lifting speed of a conventional rack-type construction elevator.

[0007] In addition, in a conventional rack-type construction elevator, assuming lifting under a high electric motor load, it is designed with a rated speed. Therefore, when the electric motor load is low, there is a possibility that the electric motor cannot be utilized efficiently.

[0008] In view of the above circumstances, an object of the present invention is to provide a construction elevator capable of automatically setting the lifting speed of a carrier and a control method for a construction elevator. Means for Solving the Problems

[0009] In order to solve the above problems, the present invention proposes the following means. The construction elevator of the present invention includes a storage space capable of accommodating an object to be transported, a lifting part capable of lifting, a load signal detection means capable of detecting the loading weight of the lifting part, and a control part that acquires the loading weight from the load signal detection means and sets the lifting speed of the lifting part based on the loading weight.

[0010] The control method of the construction elevator of the present invention includes a weight acquisition step of acquiring the loading weight of a lifting part capable of accommodating an object to be transported, and a speed determination step of setting the lifting speed of the lifting part based on the loading weight. Effects of the Invention

[0011] According to the construction elevator and the control method of the construction elevator of the present invention, it is possible to provide a construction elevator and a control method of the construction elevator capable of automatically setting the lifting speed of the carrier.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0013] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a configuration example of a construction elevator A according to the present embodiment. The construction elevator A is provided at a construction site of a structure (multi-story building) such as a super high-rise building, and is a machine for transporting workers involved in construction work and various materials and equipment necessary for construction work.

[0014] The construction elevator A includes a pair of guide rails 1A and 1B, a pair of guide masts 2A and 2B, a top sheave 3, a lifting frame 4, a carrier 5, a lifting motor 6, a pair of wire ropes 7A and 7B, a pair of counterweights 8A and 8B, a ground control panel 9, and an in-car control panel (control unit) 10.

[0015] As shown in FIG. 1, among the components of the construction elevator A, the lifting frame 4, the carrier 5, the lifting motor 6, and the in-car control panel 10 constitute a lifting unit M in the construction elevator A.

[0016] The pair of guide rails 1A and 1B are rod-shaped metal members provided inside the structure and extending in the vertical direction. Hereinafter, one of the pair of guide rails 1A and 1B is also referred to as the first guide rail 1A, and the other is referred to as the second guide rail 1B.

[0017] The pair of guide rails 1A and 1B extend parallel to each other and are provided at a predetermined interval. In the pair of guide rails 1A and 1B, one end is the lower end (lower end) in the vertical direction, and the other end is the upper end (upper end) in the vertical direction.

[0018] A rack (not shown) is formed on the pair of guide rails 1A and 1B from the lower end to the upper end. That is, the pair of guide rails 1A and 1B are rod-shaped steel materials on which tooth cutting is continuously performed from the lower end to the upper end. The rack of each guide rail 1A and 1B meshes with a pinion (circular gear) described later, and together with the pinion, it constitutes a well-known rack and pinion.

[0019] The pair of guide masts 2A and 2B are provided corresponding to the pair of guide rails 1A and 1B and are rod-shaped steel materials extending in the vertical direction. Hereinafter, one of the pair of guide masts 2A and 2B is also referred to as the first guide mast 2A, and the other is referred to as the second guide mast 2B.

[0020] As shown in FIG. 1, the first guide mast 2A is provided in the vicinity of the first guide rail 1A. Also, the first guide rail 1A and the first guide mast 2A are provided in parallel. The first guide mast 2A is provided corresponding to the first guide rail 1A and guides (guides) the lifting movement of the lifting part M at one end in the left-right direction of the lifting part M.

[0021] As shown in Fig. 1, the second guide mast 2B is provided in the vicinity of the second guide rail 1B. Also, the second guide rail 1B and the second guide mast 2B are provided in parallel. The second guide mast 2B is provided corresponding to the second guide rail 1B, and guides the lifting movement of the lifting part M at the other end in the left - right direction of the above - mentioned lifting part M.

[0022] As shown in Fig. 1, the top sheave 3 is provided on the upper - end side of the pair of guide rails 1A, 1B and the pair of guide masts 2A, 2B. The top sheave 3 is provided with a pair of rollers (not shown) around which a pair of wire ropes 7A, 7B are respectively wound. The pair of rollers are driven rollers that rotate as the lifting part M moves up and down. Hereinafter, one of the pair of rollers is also referred to as the first roller, and the other is also referred to as the second roller.

[0023] The lifting frame 4 is a frame formed by connecting a plurality of rod - shaped base materials in a box shape. The plurality of rod - shaped base materials are rod - shaped steel materials, and are connected to each other by a predetermined joining method such as welding or screwing. As shown in Fig. 1, the lifting frame 4 is a support member for supporting the carrier 5 and has a desired mechanical strength.

[0024] The carrier 5 is a box - shaped structure having a predetermined internal volume, and as shown in Fig. 1, is housed and supported by the lifting frame 4. The carrier 5 includes a storage space R for storing the transported objects such as the workers involved in construction work and various materials and equipment necessary for construction work, and an entrance / exit (not shown) for the workers and materials and equipment to enter and exit.

[0025] Note that the carrier 5 is provided with a weight sensor for measuring the weight of the transported object. The weight sensor is provided on the carrier 5 as a safety device of the construction elevator A, and outputs the weight of the transported object as the storage weight (loading load) to the ground control panel 9 or the in - carrier control panel 10. Also, the carrier 5 is provided with a contact switch for detecting the open / closed state of the entrance / exit. The contact switch outputs an open / closed signal indicating the open / closed state of the entrance / exit to the ground control panel 9 or the in - carrier control panel 10.

[0026] The lifting motor 6 is a power source that generates rotational power. As shown in FIG. 1, the lifting motor 6 is provided at the lower part of the lifting frame 4. A pinion (not shown) described above is provided on the output shaft (rotating shaft) of the lifting motor 6. The rotational power of the lifting motor 6 is converted into linear power by the engagement of the pinion (circular gear) with the racks of the pair of guide rails 1A and 1B.

[0027] Here, the lifting motor 6 is provided with a drive circuit (electric circuit) such as an inverter circuit as auxiliary equipment. The lifting motor 6 generates rotational power based on the drive current input from the drive circuit. The drive circuit of the lifting motor 6 is controlled by the ground control panel 9.

[0028] In addition, the lifting motor 6 is provided with a rotation sensor that detects the rotation speed. The rotation sensor outputs the rotation speed of the lifting motor 6 to the ground control panel 9 or the in-car control panel 10. Further, the lifting motor 6 is provided with a current sensor that detects the drive current. The current sensor outputs the drive current of the lifting motor 6 to the ground control panel 9 or the in-car control panel 10.

[0029] The lifting frame 4, the carrier 5, the lifting motor 6, and the in-car control panel 10 are integrally configured and constitute the lifting unit M in the construction elevator A. The lifting unit M moves up and down when the rotational power of the lifting motor 6 is converted into linear power by a rack and pinion composed of the pinion of the lifting motor 6 and the racks of the pair of guide rails 1A and 1B.

[0030] The pair of wire ropes 7A and 7B are steel ropes with one end connected to the upper end of the lifting frame 4 and the other end connected to the pair of counterweights 8A and 8B. Hereinafter, one of the pair of wire ropes 7A and 7B is also referred to as the first wire rope 7A, and the other is also referred to as the second wire rope 7B. Also, one of the pair of counterweights 8A and 8B is also referred to as the first counterweight 8A, and the other is also referred to as the second counterweight 8B.

[0031] The first wire rope 7A has one end connected to the upper end of the lifting frame 4 and the other end connected to the first counterweight 8A.

[0032] The second wire rope 7B has one end connected to the upper end of the lifting frame 4 and the other end connected to the second counterweight 8B.

[0033] Also, the pair of wire ropes 7A, 7B are connected to the pair of counterweights 8A, 8B via the top sheave 3. The first wire rope 7A is connected to the first counterweight 8A in a state of being wound around the first roller in the top sheave 3. Further, the second wire rope 7B is connected to the second counterweight 8B in a state of being wound around the second roller in the top sheave 3.

[0034] The pair of counterweights 8A, 8B are weights provided at the other ends of the pair of wire ropes 7A, 7B. The pair of counterweights 8A, 8B are heavy objects having a weight substantially equal to that of the lifting part M, and are provided at the other ends of the pair of wire ropes 7A, 7B hanging down from the top sheave 3.

[0035] The first counterweight 8A is connected to the other end of the first wire rope 7A and applies a downward tension according to its own weight to the first wire rope 7A. The second counterweight 8B is connected to the other end of the second wire rope 7B and applies a downward tension according to its own weight to the second wire rope 7B.

[0036] That is, the pair of wire ropes 7A, 7B and the pair of counterweights 8A, 8B are a load reduction mechanism for reducing the load on the lifting motor 6 when raising the lifting part M. The load on the lifting motor 6 is reduced because the pair of counterweights 8A, 8B apply an upward assisting force to the lifting part M via the pair of wire ropes 7A, 7B.

[0037] The ground control panel 9 is a control unit capable of controlling the hoisting motor 6 provided in the hoisting unit M. The ground control panel 9 is, for example, a software control unit that controls the hoisting motor 6 by executing a predetermined control program. The ground control panel 9 is configured as a control computer electrically connected to the hoisting motor 6.

[0038] Figure 2 is a block diagram showing the in-car control panel 10. The in-car control panel (control unit) 10 is provided in the hoisting unit M and is a control unit capable of automatically setting the hoisting speed of the hoisting unit M. The in-car control panel 10 is, for example, a software control unit that controls the ground control panel 9 by executing a predetermined control program. The in-car control panel 10 is configured as a control computer electrically connected to the ground control panel 9.

[0039] The in-car control panel 10 transmits a frequency corresponding to the hoisting speed when the hoisting unit M hoists or lowers to the ground control panel 9. The ground control panel 9 controls the hoisting motor 6 based on the frequency received from the in-car control panel 10. Note that the ground control panel 9 may be included in the in-car control panel 10. In that case, the in-car control panel 10 including the ground control panel 9 is configured to be able to control the hoisting motor 6.

[0040] The ground control panel 9 and the in-carriage control panel 10 are, for example, program-executable devices (computers) equipped with a processor, a memory, a storage unit, etc. The in-carriage control panel 10 is, for example, a PLC (Programmable Logic Controller). Also, each function of the ground control panel 9 and the in-carriage control panel 10 is realized, for example, by one or more processors such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit) executing a program stored in a program memory. However, all or part of these functions may be realized by hardware (e.g., a circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a PLD (Programmable Logic Device). Also, all or part of the above functions may be realized by a combination of software and hardware. The storage unit is realized by a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a ROM (Read-Only Memory), a RAM (Random Access Memory), or the like.

[0041] As shown in FIG. 2, the in-carriage control panel 10 includes an acquisition unit 11 and a speed determination unit 12.

[0042] The acquisition unit 11 can acquire the current value of the lifting motor 6 from the current value detection means 20. The current value detection means 20 is, for example, the above-described current sensor provided in the lifting motor 6 and capable of detecting the drive current of the lifting motor 6. The current value detection means 20 can detect the current value input to the lifting motor 6. The current value detection means 20 may be provided in the in-carriage control panel 10 and configured to be able to acquire the current value of the lifting motor 6.

[0043] The acquisition unit 11 can acquire the lifting speed (operation speed) of the lifting part M from the operation speed detection means 30. The operation speed detection means 30 is, for example, a sensor provided in the lifting part M and capable of detecting the lifting speed of the lifting part M. The operation speed detection means 30 may be configured to be able to acquire the lifting speed of the lifting part M based on the detection result of the above-mentioned rotation sensor capable of detecting the rotation speed of the lifting motor 6.

[0044] The acquisition unit 11 can acquire the load carried by the lifting part M from the load signal detection means 40. The load signal detection means 40 is, for example, the above-mentioned weight sensor capable of measuring the weight of the object to be conveyed conveyed by the carrier 5.

[0045] The speed determination unit 12 determines the lifting speed of the lifting part M and transmits the frequency corresponding to the determined lifting speed to the ground control panel 9. The method for determining the lifting speed of the lifting part M will be described later.

[0046] The speed determination unit 12 can transmit a signal for urgently stopping the lifting of the lifting part M to the emergency stop device 50.

[0047] The emergency stop device 50 is a stop device capable of urgently stopping the lifting of the lifting part M and is provided, for example, on the lifting part M, a pair of guide rails 1A, 1B or a pair of guide masts 2A, 2B.

[0048] The emergency stop device 50 may be provided on the ground control panel 9 or the in-car control panel 10 and may be configured to be able to urgently stop the lifting of the lifting part M by controlling the lifting motor 6. Further, the emergency stop device 50 may be configured to be able to urgently stop the lifting of the lifting part M based on the signal acquired from the acquisition unit 11.

[0049] Next, the control method of the construction elevator A will be described. FIG. 3 is a flowchart showing a control method for the construction elevator A. The control method for the construction elevator A described below is a control method when the lifting unit M starts to ascend or when the lifting unit M is ascending based on an operation input to the ground control panel 9 or the like.

[0050] (Step S1) When the construction elevator A is activated, the construction elevator A performs Step S1 (overload determination step). Here, the construction elevator A is activated, for example, when an operator inputs a destination floor to the ground control panel 9 or the like.

[0051] In Step S1, first, the in-car control panel 10 acquires the load weight of the carrier 5 from the load signal detection means 40 (weight acquisition step). Next, the in-car control panel 10 determines whether the carrier 5 is in an overloaded state.

[0052] The in-car control panel 10 determines whether the carrier 5 is in an overloaded state based on the load weight of the carrier 5 acquired from the load signal detection means 40. For example, the in-car control panel 10 compares the load weight of the carrier 5 acquired from the load signal detection means 40 with a threshold value (overload threshold value) to determine whether the carrier 5 is in an overloaded state. The threshold value used by the in-car control panel 10 in Step S1 is stored in advance, for example, in a storage unit of the in-car control panel 10.

[0053] When the in-car control panel 10 determines that the carrier 5 is in an overloaded state, it proceeds to Step S12 (emergency stop step). Step S12 will be described later.

[0054] Also, when the in-car control panel 10 determines that the carrier 5 is not in an overloaded state, it proceeds to Step S2 (first load determination step).

[0055] (Step S2) In step S2, the in-car control panel 10 of the carrier compares the load weight of the carrier 5 acquired from the load signal detection means 40 with a threshold value (first weight threshold value), and determines whether the value of the load weight of the carrier 5 is less than the first weight threshold value. Specifically, the in-car control panel 10 determines whether the value of the load weight of the carrier 5 is less than 4000 kg based on the load weight of the carrier 5 acquired from the load signal detection means 40. When the in-car control panel 10 determines that the value of the load weight of the carrier 5 is 4000 kg or more, it proceeds to step S3 (low-speed setting process).

[0056] (Step S3) In step S3, the speed determination unit 12 of the in-car control panel 10 sets the ascending speed of the lifting unit M to the low-speed mode. The low-speed mode is, for example, a speed mode in which the lifting unit M ascends and descends at an ascending speed of 90 m / min.

[0057] Also, in step S2 described above, when the in-car control panel 10 determines that the value of the load weight of the carrier 5 is less than 4000 kg, it proceeds to step S4 (second load determination process).

[0058] (Step S4) In step S4, the in-car control panel 10 compares the load weight of the carrier 5 acquired from the load signal detection means 40 with a threshold value (second weight threshold value), and determines whether the value of the load weight of the carrier 5 is less than the second weight threshold value. Specifically, the in-car control panel 10 determines whether the value of the load weight of the carrier 5 is less than 3000 kg based on the load weight of the carrier 5 acquired from the load signal detection means 40. When the in-car control panel 10 determines that the value of the load weight of the carrier 5 is 3000 kg or more, it proceeds to step S5 (medium-speed setting process).

[0059] (Step S5) In step S5, the speed determination unit 12 of the in-car control panel 10 sets the ascending speed of the lifting unit M to the medium-speed mode. The medium-speed mode is, for example, a speed mode in which the lifting unit M ascends and descends at an ascending speed of 100 m / min.

[0060] Also, in the above-mentioned step S4, when the in-car control panel 10 of the carrier determines that the value of the load weight of the carrier 5 is less than 3000 kg, it proceeds to step S6 (high-speed setting process).

[0061] (Step S6) In step S6, the speed determination unit 12 of the in-car control panel 10 sets the ascending / descending speed of the lifting part M to the high-speed mode. The high-speed mode is, for example, a speed mode in which the lifting part M ascends and descends at an ascending / descending speed of 110 m / min.

[0062] Hereinafter, the above-mentioned steps S2 to S6 are also referred to as the speed determination process. The speed determination process of steps S2 to S6 is a process of setting the ascending / descending speed of the lifting part M based on the load of the carrier 5. After setting the speed mode in steps S3, S5, and S6, the in-car control panel 10 proceeds to step S7 (emergency stop speed setting process).

[0063] (Step S7) In step S7, the speed determination unit 12 of the in-car control panel 10 sets the emergency stop speed of the lifting part M based on the speed mode set in steps S3, S5, and S6. For example, the in-car control panel 10 sets a speed that is 1.1 times the ascending / descending speed in the set speed mode as the emergency stop speed.

[0064] (Step S8) Next, the in-car control panel 10 performs step S8 (ascending / descending process). In step S8, the in-car control panel 10 transmits a frequency corresponding to the ascending / descending speed of the speed mode set in steps S3, S5, and S6 to the ground control panel 9. The ground control panel 9 controls the lifting motor 6 based on the frequency obtained from the in-car control panel 10 and raises and lowers the lifting part M toward the target floor.

[0065] (Step S9) Next, the in-car control panel 10 performs step S9 (emergency stop speed determination process). In step S9, first, the in-car control panel 10 obtains the ascending / descending speed of the lifting part M from the operation speed detection means 30 (speed acquisition process).

[0066] Next, the in-car control panel 10 compares the lifting speed of the lifting part M acquired from the driving speed detection means 30 with the emergency stop speed set in step S7, and determines whether or not the lifting speed of the lifting part M has reached the emergency stop speed set in step S7.

[0067] When the in-car control panel 10 determines that the lifting speed of the lifting part M has reached the emergency stop speed set in step S7, it proceeds to step S12 (emergency stop process). Step S12 will be described later.

[0068] Also, when the in-car control panel 10 determines that the lifting speed of the lifting part M has not reached the emergency stop speed set in step S7, it proceeds to step S10 (overcurrent determination process).

[0069] (Step S10) In step S10, the in-car control panel 10 determines whether or not an overcurrent is flowing through the lifting motor 6. In step S10, first, the in-car control panel 10 acquires the current value of the lifting motor 6 from the current value detection means 20 (current value acquisition process).

[0070] Next, based on the current value of the lifting motor 6 acquired from the current value detection means 20, the in-car control panel 10 determines whether or not an overcurrent is flowing through the lifting motor 6. For example, the in-car control panel 10 compares the current value of the lifting motor 6 acquired from the current value detection means 20 with a threshold value (overcurrent threshold value) to determine whether or not an overcurrent is flowing through the lifting motor 6. The threshold value used by the in-car control panel 10 in step S10 is stored in advance, for example, in the storage unit of the in-car control panel 10.

[0071] When the in-car control panel 10 determines that an overcurrent is flowing through the lifting motor 6, it proceeds to step S12 (emergency stop process). Step S12 will be described later.

[0072] Also, when the in-car control panel 10 determines that no overcurrent is flowing through the hoist motor 6, it continues the lifting and lowering of the lifting part M and makes the lifting part M reach the target floor (step S11).

[0073] Based on the determination results in steps S1, S9, and S10, the in-car control panel 10 shifts to step S12 (emergency stop process).

[0074] (Step S12) In step S12, the in-car control panel 10 transmits a signal for emergently stopping the lifting part M to the emergency stop device 50. The emergency stop device 50 emergently stops the lifting part M based on the signal acquired from the in-car control panel 10.

[0075] When the carrier 5 is in an overloaded state, when the lifting and lowering speed of the lifting part M reaches the emergency stop speed, or when overcurrent is flowing through the hoist motor 6, the in-car control panel 10 performs step S12. The in-car control panel 10 or the emergency stop device 50 may notify the operator that the construction elevator A is in an overloaded state, an emergency stop speed state, or an overcurrent state when it is in an overloaded state, an emergency stop speed state, or an overcurrent state.

[0076] According to the construction elevator A of the present embodiment, it has a storage space R capable of storing the object to be conveyed, a lifting part M capable of lifting and lowering, a load signal detection means 40 capable of detecting the load on the lifting part M, and an in-car control panel (control unit) 10 that acquires the load from the load signal detection means 40 and sets the lifting and lowering speed of the lifting part M based on the load acquired from the load signal detection means 40.

[0077] As a result, it is possible to provide a construction elevator A capable of automatically setting the lifting and lowering speed of the carrier 5 and a control method for the construction elevator A.

[0078] When the load acquired by the in-car control panel 10 from the load signal detection means 40 is equal to or greater than the first weight threshold (for example, 4000 kg), the in-car control panel 10 sets the ascending speed of the lifting part M to the low-speed mode.

[0079] In the ascending and descending section M that is ascending, when the load is equal to or greater than the first weight threshold, since the load on the elevator motor 6 is large and in a heavy load state, by raising it in the low speed mode, it is possible to suppress the load on the elevator motor 6 from being excessive.

[0080] When the load detected by the load signal detecting means 40 and acquired by the in-car controller 10 is less than the second weight threshold (for example, 3000 kg), the in-car controller 10 sets the ascending speed of the ascending and descending section M to the high speed mode. Here, the second weight threshold is a value smaller than the first weight threshold.

[0081] In the ascending and descending section M that is ascending, when the load is less than the second weight threshold, since the load on the elevator motor 6 is small and in a light load state, by raising it in the high speed mode, the elevator motor 6 can be utilized efficiently.

[0082] When the load detected by the load signal detecting means 40 and acquired by the in-car controller 10 is less than the first weight threshold and equal to or greater than the second weight threshold, the in-car controller 10 sets the ascending and descending speed of the ascending and descending section M to the medium speed mode. Here, the medium speed mode is a speed mode that is faster than the low speed mode and slower than the high speed mode.

[0083] When the load is less than the first weight threshold and equal to or greater than the second weight threshold, for example, the load on the carrier 5 is about 50% of the rated load, and the load on the elevator motor 6 is greater than the light load state and smaller than the heavy load state. Therefore, by raising and lowering the ascending and descending section M in the medium speed mode, the elevator motor 6 can be utilized efficiently.

[0084] The in-car controller 10 sets the ascending and descending speed of the ascending and descending section M to the medium speed mode when, for example, the weight of the ascending and descending section M including the load is approximately equal to the weights of the counterweights 8A and 8B.

[0085] As described above, the control method of the construction elevator A when the ascending and descending section M ascends has been described with reference to FIG. 3. Next, the control method of the construction elevator A when the ascending and descending section M descends will be described.

[0086] When the elevating part M descends, the control methods in step S3 and step S6 shown in FIG. 3 are different.

[0087] When the elevating part M descends, in step S3, the speed determination unit 12 of the in-car control panel 10 of the carrier sets the descending speed of the elevating part M to the high-speed mode.

[0088] In the descending elevating part M, when the load is equal to or greater than the first weight threshold, since the load on the elevating motor 6 is in a light load state where it is small, by raising it in the high-speed mode, the elevating motor 6 can be utilized efficiently.

[0089] Also, when the elevating part M descends, in step S6, the speed determination unit 12 of the in-car control panel 10 of the carrier sets the descending speed of the elevating part M to the low-speed mode.

[0090] In the descending elevating part M, when the load is less than the second weight threshold, since the load on the elevating motor 6 is in a heavy load state where it is large, by raising it in the low-speed mode, it is possible to suppress the load on the elevating motor 6 from being excessive.

[0091] In this way, when the elevating part M ascends or descends, the in-car control panel 10 determines the ascending / descending speed of the elevating part M based on the load of the carrier 5. Therefore, the construction elevator A can raise and lower the elevating part M at an ascending / descending speed according to the load state of the elevating motor 6, and can drive the elevating motor 6 efficiently.

[0092] As described above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present invention are also included. Also, the components shown in the above-described one embodiment and the modification examples shown below can be configured by appropriately combining them.

[0093] (Modification Example 1) In the above embodiment, the in-car control panel (control unit) 10 of the carrier 5 sets the lifting speed of the lifting unit M based on the load of the carrier 5. However, the ground control panel may be configured as a control unit to be able to set the lifting speed of the lifting unit M based on the load of the carrier 5.

[0094] In that case, the ground control panel is configured to be able to acquire the current value of the lifting motor 6, the lifting speed of the lifting unit M, and the load. Based on the acquired current value of the lifting motor 6, the lifting speed of the lifting unit M, and the load, the construction elevator A is controlled, and the lifting speed of the lifting unit M is set based on the load of the carrier 5.

[0095] (Modification 2) In the above embodiment, the first weight threshold is set to 4000 kg and the second weight threshold is set to 3000 kg. However, the first weight threshold and the second weight threshold are not limited to this. Any weight can be appropriately adopted for the first weight threshold and the second weight threshold according to the configuration and purpose of use of the construction elevator A.

[0096] (Modification 3) In the above embodiment, the in-car control panel 10 sets the lifting speed of the lifting unit M to three speed modes: low speed mode, medium speed mode, and high speed mode based on the load of the carrier 5. However, the setting of the speed mode is not limited to this.

[0097] The in-car control panel may set the lifting speed of the lifting unit M in a multi-stage manner based on the load. For example, the in-car control panel may calculate and set the lifting speed of the lifting unit M using a function having the load as a variable. Also, the in-car control panel may set the lifting speed of the lifting unit M so that the relationship between the load and the lifting speed becomes linear based on the load.

[0098] Also, in each speed mode, the in-car control panel 10 may raise and lower the lifting part M within a speed range having a predetermined width. For example, the in-car control panel 10 may raise and lower the lifting part M within a speed range of 90 to 100 m / min in the low-speed mode, within a speed range of 100 to 110 m / min in the medium-speed mode, and within a speed range of 110 to 120 m / min in the high-speed mode.

[0099] There are 17 international goals adopted at the United Nations Summit in September 2015, namely the "Sustainable Development Goals (SDGs)". The construction elevator A and the control method of the construction elevator A according to the present embodiment can contribute to the achievement of, for example, the goal of "9. Build the foundation of industry and technological innovation" among these 17 SDG goals.

Explanation of Signs

[0100] A Construction elevator M Lifting part R Storage space 1A, 1B Guide rail 2A, 2B Guide mast 3 Top sheave 4 Lifting frame 5 Carriage 6 Lifting motor 7A, 7B Wire rope 8A, 8B Counterweight 9 Ground control panel 10 In-car control panel (control unit) 11 Acquisition unit 12 Speed determination unit 20 Current value detection means 30 Operating speed detection means 40 Load signal detection means 50 Emergency stop device

Claims

1. It has a storage space capable of storing an object to be conveyed, a lifting part that can be lifted and lowered, load signal detection means capable of detecting the load capacity of the lifting part, a control unit that acquires the load capacity from the load signal detection means and sets the lifting and lowering speed of the lifting part based on the load capacity, and is provided with a construction elevator.

2. When the lifting part rises, the control unit sets the rising speed of the lifting part to the low-speed mode when the load capacity is equal to or greater than the first weight threshold, sets the rising speed of the lifting part to the medium-speed mode, which is faster than the low-speed mode, when the load capacity is less than the first weight threshold and equal to or greater than the second weight threshold, which is a value less than the first weight threshold, sets the rising speed of the lifting part to the high-speed mode, which is faster than the medium-speed mode, when the load capacity is less than the second weight threshold, The construction elevator according to Claim 1.

3. When the lifting part descends, the control unit sets the descending speed of the lifting part to the high-speed mode when the load capacity is equal to or greater than the first weight threshold, sets the descending speed of the lifting part to the medium-speed mode, which is slower than the high-speed mode, when the load capacity is less than the first weight threshold and equal to or greater than the second weight threshold, which is a value less than the first weight threshold, sets the descending speed of the lifting part to the low-speed mode, which is slower than the medium-speed mode, when the load capacity is less than the second weight threshold, The construction elevator according to Claim 1.

4. The control unit sets the emergency stop speed of the lifting part based on the lifting and lowering speed of the lifting part set based on the load capacity. The construction elevator according to Claim 1.

5. It further includes operating speed detection means capable of detecting the lifting and lowering speed of the lifting part, and the control unit stops the lifting part emergently based on the emergency stop speed and the lifting and lowering speed of the lifting part detected by the operating speed detection means. The construction elevator according to Claim 4.

6. a lifting motor provided at the lower part of the lifting part and capable of generating rotational power, a guide rail having a rack that meshes with a pinion of the lifting motor to form a rack and pinion, and is further provided with the lifting motor and the guide rail lift the lifting part by converting the rotational power generated by the lifting motor into linear motion power using the rack and pinion. The construction elevator according to claim 1.

7. A weight acquisition step of acquiring the load capacity of the lifting part capable of accommodating the object to be conveyed, A speed determination step of setting the lifting speed of the lifting part based on the load capacity, Comprising, A control method for a construction elevator.

8. When the lifting part ascends, in the speed determination step, When the load capacity is equal to or greater than the first weight threshold, set the ascending speed of the lifting part to the low speed mode, When the load capacity is less than the first weight threshold and equal to or greater than a second weight threshold which is a value smaller than the first weight threshold, set the ascending speed of the lifting part to the medium speed mode which is faster than the low speed mode, When the load capacity is less than the second weight threshold, set the ascending speed of the lifting part to the high speed mode which is faster than the medium speed mode, The control method for a construction elevator according to claim 7.

9. When the lifting part descends, in the speed determination step, When the load capacity is equal to or greater than the first weight threshold, set the descending speed of the lifting part to the high speed mode, When the load capacity is less than the first weight threshold and equal to or greater than a second weight threshold which is a value smaller than the first weight threshold, set the descending speed of the lifting part to the medium speed mode which is slower than the high speed mode, When the load capacity is less than the second weight threshold, set the descending speed of the lifting part to the low speed mode which is slower than the medium speed mode, The control method for a construction elevator according to claim 7.

10. Further comprising an emergency stop speed setting step of setting an emergency stop speed based on the lifting speed of the lifting part set in the speed determination step after the speed determination step, The control method for a construction elevator according to any one of claims 7 to 9.

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