A method for optimizing a structure of a lift car floor

Abstract

The application discloses a kind of freight elevator car bottom structure optimization methods;The method is as follows: one, the base of the freight elevator car bottom is constructed;Two, multiple arch-shaped load-bearing blocks arranged in array are laid on the base.Three, use the freight elevator laid with arch-shaped load-bearing block to carry out goods lifting transportation;Piezoelectric detection element on each arch-shaped load-bearing block detects the pressure received by itself in real time.Four, after the use time of the freight elevator reaches the preset test period, the pressure change condition measured by the piezoelectric detection element of each arch-shaped load-bearing block is analyzed;For the arch-shaped load-bearing block whose pressure change condition reaches the preset load too large condition, structure is strengthened.The arch-shaped car bottom structure design in the application has the characteristics of lightweight and strong compression resistance, can save materials, and reduce the self weight of the freight elevator.Moreover, the application improves the comprehensive load capacity of the freight elevator car bottom in a specific scenario through local strengthening.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of freight elevators, and particularly relates to a freight elevator car bottom structure optimization method. BACKGROUND

[0002] The freight elevator is an important vertical transportation tool for transporting raw materials, parts and equipment in factories, supermarkets and the like. With the development of economy, the number of freight elevators is increasing, and the load capacity is increasing, so the load capacity of the freight elevator is very important. At present, many freight elevators are often used in the use of forklifts and other loading equipment for loading and unloading goods, and the forklifts and other loading equipment enter the freight elevator, which has the problems of large load, unbalanced load and the like, and has high requirements for the structural strength and rigidity of the car bottom. In addition, the freight elevator in the fixed scene has the characteristics of a region with a relatively fixed load. SUMMARY

[0003] The application aims to provide a freight elevator car bottom structure optimization method.

[0004] A freight elevator car bottom structure optimization method comprises the following steps:

[0005] Step 1: Constructing a base of the freight elevator car bottom; a plurality of longitudinal beams are arranged on the base in an equal interval.

[0006] Step 2: Laying a plurality of arched load-bearing blocks in an array on the base. The top surface of the arched load-bearing block is a horizontal surface, and the bottom surface is provided with an arc-shaped groove. A piezoelectric detection element is arranged on the top surface of the arched load-bearing block. Two weight-reducing groove groups are formed in the side surface of the arched load-bearing block. The two weight-reducing groove groups are arranged on opposite sides of the arc-shaped groove. The weight-reducing groove group comprises a weight-reducing through groove arranged in sequence along the length direction of the arched load-bearing block. The bottom surface of the arched load-bearing block is provided with two support portions respectively located on opposite sides of the arc-shaped groove. The two support portions on the arched load-bearing block are respectively supported in the limiting grooves of the adjacent two longitudinal beams.

[0007] Step 3: Using the freight elevator with the arched load-bearing blocks laid thereon to transport goods; the piezoelectric detection elements on the arched load-bearing blocks detect the pressure received by themselves in real time.

[0008] Step 4: After the use time of the freight elevator reaches a preset test period, analyzing the pressure change of the piezoelectric detection elements of the arched load-bearing blocks; and strengthening the structure of the arched load-bearing blocks whose pressure change reaches a preset load overload condition.

[0009] The structure strengthening method adopts one or both of the following two methods:

[0010] Method one, a reinforcing block is arranged in each weight-reducing groove of the arch-shaped load-bearing block, so that the two side surfaces of the reinforcing block are in contact with the two side surfaces of the weight-reducing groove.

[0011] Method two, an arc-shaped support beam is arranged in the arc-shaped groove of the arch-shaped load-bearing block, so that the outer side surface of the arc-shaped support beam is in contact with the inner concave surface of the arc-shaped groove.

[0012] As a preference, the load overload condition is any one or more of the following:

[0013] Condition 1: the piezoelectric detection element of the arch-shaped load-bearing block has detected a pressure exceeding the limit bearing force F max .

[0014] Condition 2: the piezoelectric detection element of the arch-shaped load-bearing block detects a threshold pressure F s every day, and the duration of the pressure is greater than or equal to a preset time.

[0015] As a preference, the base in step one includes a rectangular frame, longitudinal beams and cross beams. The rectangular frame includes two longitudinal supports and two cross supports. One end of the two longitudinal supports is fixed to the two ends of one of the cross supports, respectively. The other end of the two longitudinal supports is fixed to the two ends of the other cross support, respectively. A plurality of longitudinal beams parallel to each other are arranged on the rectangular frame in sequence at equal intervals along the length direction of the rectangular frame. The two ends of the longitudinal beams are fixed to the two cross supports, respectively. A plurality of cross beams are fixed to the bottom of the rectangular frame. The two ends of the cross beams are fixed to the two longitudinal supports, respectively. The middle part of each longitudinal beam is supported on the cross beam.

[0016] As a preference, the abutment of the weight-reducing groove and the arc-shaped groove forms a circular arc segment with equal thickness.

[0017] As a preference, a plurality of guide slides for mounting the reinforcing block are arranged in the weight-reducing groove. The reinforcing block is inserted into the guide slide.

[0018] As a preference, a chamfer is arranged at the connection between the arc-shaped groove and the support part.

[0019] As a preference, the piezoelectric detection element adopts a bidirectional resistance strain gauge.

[0020] As a preference, the cargo elevator car bottom is provided with a control module. The control module includes a signal conditioning circuit, an analog-to-digital converter, a terminal controller, an encoder and a wireless transmission module installed in the inner end of the elevator car, and a wireless receiving module, a decoder, a processor, a computer and a display installed in the control machine room. The signal conditioning circuit, the analog-to-digital converter, the terminal controller, the encoder and the wireless transmission module are connected in sequence for signal transmission. The wireless receiving module, the decoder, the processor, the computer and the display are connected in sequence for signal transmission.

[0021] As preferred, the signals outputted by the piezoelectric detection elements in the working process are converted into digital signals and transmitted to the terminal controller after being processed by the signal conditioning circuit and the analog-digital converter in turn; the pressure signal outputted by the terminal controller is sent to the wireless receiving module through the wireless transmitting module after being encoded by the encoder; the signal outputted by the wireless receiving module is transmitted to the processor after being decoded by the decoder; the processor sends the pressure values of the arch-shaped load-bearing blocks to the computer; and the computer displays the pressure values of the arch-shaped load-bearing blocks on the display.

[0022] The present application has the following advantages:

[0023] 1. The optimized goods elevator car bottom in the present application is formed by arranging a plurality of arch-shaped load-bearing blocks, which has the characteristics of light weight and strong compression resistance. The arch-shaped structure is light in weight, high in strength, large in rigidity and stable in structure, and can save materials; and under the action of vertical load, the arch-shaped structure not only generates vertical counterforce, but also decomposes the downward pressure into horizontal thrust as much as possible, thereby having good compression resistance and being able to bear a large load.

[0024] 2. The arch-shaped car bottom structure in the present application is composed of a plurality of arch-shaped load-bearing blocks and supports and beams, and has the characteristics of easy installation and easy disassembly. After a long time of operation, once the car bottom plane is deformed or damaged, the deformed or damaged load-bearing blocks can be quickly pulled out for replacement.

[0025] 3. The present application installs a bidirectional resistance strain gauge (pressure detection element) on each arch-shaped load-bearing block, which can detect the pressure on each block, and through long-term detection and comparison, the stress area diagram of the car bottom can be obtained. Moreover, the present application provides two kinds of reinforcing structures for the arch-shaped load-bearing blocks; thereby the stress area diagram of the car bottom can be customized for local reinforcement, forming a closed-loop design, so as to realize the light weight of the goods elevator car bottom and reduce the loss and cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The present application is used for the overall structure diagram of the goods elevator car bottom.

[0027] Figure 2 The present application is used for the top view diagram of the goods elevator car bottom.

[0028] Figure 3 The present application is used for the structure diagram of the base in the goods elevator car bottom.

[0029] Figure 4 The present application is used for the diagram of the arch-shaped load-bearing block in the goods elevator car bottom.

[0030] Figure 5 The present application is used for the system block diagram of the control module in the goods elevator car bottom.

[0031] Figure 6 A schematic diagram of using reinforcing blocks to increase the load-bearing capacity of the arch-shaped load-bearing blocks in the elevator car bottom used in the present application.

[0032] Figure 7 A schematic diagram of the arc-shaped support beams in the elevator car bottom used in the present application. DETAILED DESCRIPTION

[0033] The structure of the present application is further explained below in conjunction with the accompanying drawings.

[0034] As shown in FIGS. Figure 1 , 2 and 3, a method for optimizing the structure of an elevator car bottom, the elevator car bottom used comprising a base, a control module, and a plurality of arch-shaped load-bearing blocks 1 arranged in a matrix on the base. The base comprises a rectangular frame, bolts 4, longitudinal beams 5, and transverse beams 6. The rectangular frame comprises two longitudinal supports 2 and two transverse supports 3. One end of the two longitudinal supports 2 is fixed to the two ends of one of the two transverse supports 3, respectively. The other end of the two longitudinal supports 2 is fixed to the two ends of the other of the two transverse supports 3, respectively. A plurality of longitudinal beams 5 parallel to each other are arranged on the rectangular frame in sequence at equal intervals along the length direction of the rectangular frame. The two ends of the longitudinal beams 5 are fixed to the two transverse supports 3 by the bolts 4, respectively. The axial distance between the two adjacent longitudinal beams 5 is equal to the length of the arch-shaped load-bearing blocks 1. The two transverse beams 6 arranged at intervals are both fixed to the bottom of the rectangular frame. The two ends of the transverse beams 6 are fixed to the two longitudinal supports 2, respectively. The middle part of each longitudinal beam 5 is supported on the two transverse beams 6.

[0035] As shown in FIGS. Figure 4 The top surface of the arch-shaped load-bearing block 1 is a horizontal surface, and the bottom surface is provided with an arc-shaped groove 7. The bottom surface of the arch-shaped load-bearing block 1 is provided with two support portions located on opposite sides of the arc-shaped groove 7, respectively. The connection between the arc-shaped groove 7 and the support portion is provided with a chamfer to avoid a right angle. The side surface of the arch-shaped load-bearing block 1 is provided with two weight-reducing groove groups. The two weight-reducing groove groups are arranged on opposite sides of the arc-shaped groove 7. The weight-reducing groove group comprises weight-reducing through grooves 8 arranged in sequence along the length direction of the arch-shaped load-bearing block 1. The abutting portions between the weight-reducing through grooves 8 and the arc-shaped groove 7 form circular arc segments with equal thickness. Between the two adjacent weight-reducing through grooves 8, a load-bearing pillar in the form of a flat plate is formed. When the load-bearing capacity of the arch-shaped load-bearing block 1 is insufficient, the load-bearing capacity of the arch-shaped load-bearing block 1 can be improved by adding reinforcing blocks 9 into the weight-reducing through grooves 8 in such a way that the two side surfaces of the reinforcing blocks 9 are in contact with the two side surfaces of the weight-reducing through grooves 8, respectively.

[0036] The arch-shaped load-bearing blocks 1 are closely arranged on the base; the support portions on both sides of the bottom of the arch-shaped load-bearing block 1 are supported on the longitudinal supports 2 and the longitudinal beams 5, and the adjacent two longitudinal beams 5, respectively. The top of each longitudinal beam 5 is provided with a limiting groove. The support portions on the adjacent sides of the two adjacent arch-shaped load-bearing blocks 1 are limited in the limiting groove of the same longitudinal beam 5. The arch-shaped load-bearing block 1 can slide along the length direction of the limiting groove.

[0037] The top surface of the arch-shaped load-bearing block 1 is provided with a piezoelectric detection element 11. The piezoelectric detection element 11 adopts a bidirectional resistance strain gauge. Each strain gauge forms a pressure detection array and can detect the pressure value received at different positions of the elevator car bottom.

[0038] As shown in Figure 5 The control module includes a signal conditioning circuit 12, an analog-to-digital converter 13, a terminal controller 14, an encoder 15, and a wireless transmission module 16 installed in the inner end of the elevator car, and a wireless receiving module 17, a decoder 18, a processor 19, a computer 20, and a display 21 installed in the control room. The signal conditioning circuit 12, the analog-to-digital converter 13, the terminal controller 14, the encoder 15, and the wireless transmission module 16 are sequentially connected for signal transmission. The wireless receiving module 17, the decoder 18, the processor 19, the computer 20, and the display 21 are sequentially connected for signal transmission.

[0039] The signal output by each piezoelectric detection element 11 is sequentially processed by the signal conditioning circuit 12 and the analog-to-digital converter 13, converted into a digital signal, and transmitted to the terminal controller 14; the output interface of the terminal controller 14 is connected to the wireless transmission module 16 through the encoder 15. The wireless transmission module 16 communicates wirelessly with the wireless receiving module 17. The input interface of the processor 19 is connected to the wireless receiving module 17 through the decoder 18. The output interface of the processor 19 is connected to the computer 20. The computer 20 is connected to the display 21.

[0040] The method for optimizing the structure of the elevator car bottom comprises the following steps:

[0041] Step one, use the elevator with arch-shaped load-bearing blocks to transport goods; the analog signals detected by the bidirectional resistance strain gauges on each arch-shaped load-bearing block 1 are converted into digital pressure signals by the analog-to-digital converter 13 of the signal conditioning circuit 12 and sent to the terminal controller 14; the terminal controller 14 encodes the digital pressure signals detected by the pressure detection unit through the encoder 15 and sends them to the wireless receiving module 17 of the upper computer using the wireless transmission module 16; the pressure signals received by the wireless receiving module 17 are processed by the decoder 18 and transmitted to the processor 19 of the upper computer. The processor 19 sends the received pressure signals to the computer 20. The computer 20 displays the pressure signals on the display 21, and the specific data transmission process is shown in Figure 5 .

[0042] Step two, after the use time of the elevator reaches the preset test period, analyze the pressure change measured by the piezoelectric detection elements of each arch-shaped load-bearing block; and structureally reinforce the arch-shaped load-bearing blocks whose pressure change meets the preset excessive load condition.

[0043] The excessive load condition is any one or more of the following:

[0044] Condition 1: The piezoelectric detection element of the arch-shaped load-bearing block has detected a pressure exceeding the limit bearing force F max .

[0045] Condition 2: The piezoelectric detection element of the arch-shaped load-bearing block has detected a threshold pressure F s for more than or equal to a preset time every day.

[0046] The structural reinforcement is achieved by one or both of the following methods:

[0047] Method 1: As shown in Figure 6 , a reinforcing block 9 is arranged in each lightening groove 8 of the arch-shaped load-bearing block 1. The width of the reinforcing block 9 is equal to the width of the lightening groove 8. The reinforcing block 9 is fixedly bonded to the side surfaces of the lightening groove 8. The two side surfaces of the reinforcing block 9 respectively abut against the two side surfaces of the lightening groove 8, thereby increasing the pressure-bearing capacity of the arch-shaped load-bearing block 1.

[0048] Method 2: As shown in Figure 7 , an arc-shaped support beam is arranged in the arc-shaped groove 7 of the arch-shaped load-bearing block 1; the outer side surface shape of the arc-shaped support beam is the same as the inner concave surface shape of the arc-shaped groove 7. The thickness of the arc-shaped support beam is equal to the thickness of the circular arc segment between the lightening groove 8 and the arc-shaped groove 7.

[0049] The present embodiment provides an optional and non-essential method for determining the number of reinforcing blocks, which is as follows:

[0050] The expression of the safe allowable stress F1 is shown in equation (1):

[0051]

[0052] In equation (1), E1 is the elastic modulus of the arch-shaped load-bearing block 1; S1 is the stress area of the arch-shaped load-bearing block 1; L1 is the thickness (normal thickness relative to the stress area) of the arch-shaped load-bearing block 1 at the stress position, and ΔL1 is the allowable value of the thickness change of the arch-shaped load-bearing block 1, which is set according to the material properties (load-bearing failure / power transmission failure).

[0053] The expression of the bearing capacity F2 of the reinforcing block 9 is shown in equation (2):

[0054]

[0055] In equation (2), E2 is the elastic modulus of the material of the reinforcing block 9, S2 is the stress cross-sectional area of the reinforcing block 9, L2 is the length of the reinforcing block 9, and ΔL2 is the allowable value of the length change of the reinforcing block 9, which is set according to the material properties (load-bearing failure / power transmission failure).

[0056] If the pressure F measured by the bidirectional resistance strain gauge is greater than or equal to the safe allowable stress F1, the arched load-bearing block 1 needs to be provided with the reinforcing blocks 9. The expression of the number N of the reinforcing blocks 9 is shown as formula (3):

[0057]

[0058] In formula (3), Int(·) is a down-rounding function.

[0059] Embodiment 2

[0060] The difference between the embodiment and the embodiment 1 is that the weight-reducing groove 8 of the cargo elevator car bottom is provided with a plurality of guide slides arranged along the vertical direction in sequence. The guide slides are used to provide limiting for the reinforcing blocks 9. The reinforcing blocks 9 are slidably connected with the guide slides, so as to avoid direct bonding between the reinforcing blocks 9 and the weight-reducing groove 8, thereby facilitating the removal of the reinforcing blocks 9. When the weighing capacity of the arched load-bearing block 1 needs to be enhanced, only a plurality of reinforcing blocks 9 need to be inserted into all or part of the guide slides.

Claims

1. A method of optimizing a structure of a car bottom of a freight elevator, characterized by: It comprises the following steps: Step one, build the base of the elevator car bottom; the base is provided with a plurality of longitudinal beams (5) arranged in sequence and at equal intervals; the top of the longitudinal beam (5) is provided with a limiting groove; Step two, lay a plurality of arched load-bearing blocks (1) arranged in an array on the base; the top surface of the arched load-bearing block (1) is a horizontal surface, and the bottom surface is provided with an arc-shaped groove (7); the top surface of the arched load-bearing block (1) is provided with a piezoelectric detection element (11); the side surface of the arched load-bearing block (1) is provided with two weight-reducing groove groups; the two weight-reducing groove groups are arranged on opposite sides of the arc-shaped groove (7); the weight-reducing groove group comprises weight-reducing through grooves (8) arranged in sequence along the length direction of the arched load-bearing block (1); the bottom surface of the arched load-bearing block (1) is provided with two support portions respectively located on opposite sides of the arc-shaped groove (7); the two support portions on the arched load-bearing block (1) are respectively supported in the limiting grooves of the adjacent two longitudinal beams (5); Step three, use the elevator with the arched load-bearing blocks (1) laid to transport goods; the piezoelectric detection element (11) on each arched load-bearing block (1) detects the pressure received in real time; Step four, after the use time of the elevator reaches the preset test period, analyze the pressure change of the piezoelectric detection element (11) of each arched load-bearing block (1); the arched load-bearing block (1) whose pressure change meets the preset excessive load condition is subjected to structural reinforcement; The structural reinforcement method adopts one or both of the following two methods: Method one, a reinforcing block (9) is arranged in each weight-reducing through groove (8) of the arched load-bearing block (1), so that the two side surfaces of the reinforcing block (9) respectively contact the two side surfaces of the weight-reducing through groove (8); Method two, an arc-shaped support beam is arranged in the arc-shaped groove (7) of the arched load-bearing block (1), so that the outer side surface of the arc-shaped support beam contacts the inner concave surface of the arc-shaped groove (7).

2. A method of optimizing a landing structure for a goods lift according to claim 1, characterized in that: The excessive load condition is any one or more of the following: Condition 1: The piezoelectric detecting element (11) of the arch-shaped load-bearing block (1) has detected a pressure exceeding the limit load-bearing force F max ; Condition 2: The piezoelectric detection element (11) of the arch-shaped load-bearing block (1) detects a threshold pressure F every day s The duration of the above pressure is greater than or equal to a preset time.

3. The method of optimizing a landing structure for a freight elevator as defined in claim 1, wherein: The base in step one comprises a rectangular frame, longitudinal beams (5) and cross beams (6); the rectangular frame comprises two longitudinal supports (2) and two cross supports (3); one end of the two longitudinal supports (2) is respectively fixed with two ends of one of the two cross supports (3); the other end of the two longitudinal supports (2) is respectively fixed with two ends of the other cross support (3); a plurality of longitudinal beams (5) parallel to each other are arranged in sequence and at equal intervals on the rectangular frame along the length direction of the rectangular frame; the two ends of the longitudinal beam (5) are respectively fixed with the two cross supports (3); a plurality of cross beams (6) are all fixed on the bottom of the rectangular frame; the two ends of the cross beam (6) are respectively fixed with the two longitudinal supports (2); the middle part of each longitudinal beam (5) is supported on the cross beam (6).

4. The method of optimizing a landing structure for a freight elevator of claim 1, wherein: The abutting portion of the weight-reducing through groove (8) and the arc-shaped groove (7) forms a circular segment with equal thickness.

5. The method of optimizing a landing structure for a freight elevator of claim 1, wherein: The weight-reducing through groove (8) is provided with a plurality of guide slides for mounting the reinforcing block (9) therein; the reinforcing block (9) is inserted into the guide slide.

6. The method of optimizing a landing structure for a freight elevator of claim 1, wherein: The connecting portion of the arc-shaped groove (7) and the support portion is provided with a chamfer.

7. The method of optimizing a landing structure for a freight elevator of claim 1, wherein: The piezoelectric detection element (11) adopts a bidirectional resistance strain gauge.

8. The method of optimizing a landing structure for a freight elevator of claim 1, wherein: The control module is arranged on the elevator car bottom; the control module comprises a signal conditioning circuit (12), an analog-digital converter (13), a terminal controller (14), an encoder (15), and a wireless transmitting module (16) arranged on the inner end of the elevator car, and a wireless receiving module (17), a decoder (18), a processor (19), a computer (20), and a display (21) arranged in the control room; the signal conditioning circuit (12), the analog-digital converter (13), the terminal controller (14), the encoder (15), and the wireless transmitting module (16) are sequentially connected for signal transmission; the wireless receiving module (17), the decoder (18), the processor (19), the computer (20), and the display (21) are sequentially connected for signal transmission.

9. A method of optimizing a landing structure for a goods lift according to claim 8, characterized in that: In the working process, the signals output by the piezoelectric detection elements (11) are sequentially processed by the signal conditioning circuit (12) and the analog-digital converter (13), converted into digital signals, and transmitted to the terminal controller (14); the pressure signal output by the terminal controller (14) is encoded by the encoder (15) and sent to the wireless receiving module (17) through the wireless transmitting module (16); the signal output by the wireless receiving module (17) is decoded by the decoder (18) and transmitted to the processor (19); the processor (19) sends the pressure values received by each arch-shaped load-bearing block (1) to the computer (20); the computer (20) displays the pressure values received by each arch-shaped load-bearing block (1) on the display (21).

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