CN114348927B - Overweight detection method - Google Patents
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- CN114348927B CN114348927B CN202111496663.3A CN202111496663A CN114348927B CN 114348927 B CN114348927 B CN 114348927B CN 202111496663 A CN202111496663 A CN 202111496663A CN 114348927 B CN114348927 B CN 114348927B
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- 238000013461 design Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
According to the overweight detection method, based on the lever stroke amplification principle, the stress deformation quantity of the overload detection spring is amplified and then transmitted to the tail end of the lever to trigger the micro switch, so that an alarm condition can be triggered within a small overload range, the outage of a traction electric system is effectively implemented, overload operation of a hoist is prevented, and a driving part is protected from being damaged by stress. The overweight detection method is characterized in that a connecting screw rod is connected with a lifting chain which pulls the cargo carrying platform to move vertically in a lifting manner, and the connecting screw rod sequentially penetrates through the cargo carrying platform, the lever connecting seat and the base; a spring is sleeved on the connecting screw rod, and the two vertical ends of the spring are respectively clamped between the lever connecting seat and the base to be in a compressed state; a lever ejector rod is hung and connected below the lever connecting seat, the bottom end of the lever ejector rod is hinged to the lever, and the proximal end of the lever is hinged to the base; the micro switch is arranged at one side of the connecting screw rod, and the far end of the lever is close to the micro switch.
Description
Technical Field
The invention relates to a novel detection method for overweight and broken belt detection of a lifting device in an automatic stereoscopic warehouse, and belongs to the technical field of logistics storage.
Background
At present, in conveying equipment in the logistics storage industry, a lifting machine is generally used for lifting or lowering devices such as a tray and a cargo carrying platform from one working height to another working height, so that the vertical warehouse is assisted to finish warehousing and ex-warehouse of materials, layer changing operation and maintenance operation of a trolley and the like. The prior art elevator is provided with belt breakage detection devices of different types and using principles so as to test and judge the running state of the lifting assembly at any time.
The operation dynamic load of the existing elevator is matched with the rated load, when the actual load of the elevator exceeds the rated load and operates for a long time, the elevator motor and other traction stretching components can be abnormal, and even the equipment can be damaged, namely the whole safe operation of the equipment is affected. Therefore, when the elevator is overloaded, the corresponding early warning system can prompt and give an alarm, but the existing alarm processing technology is rough, the overload detection and induction range cannot be reduced or refined, the alarm condition is difficult to trigger in real time in the lower overload range, and stress damage is still caused to the traction and driving components. In addition, other auxiliary broken belt detection devices are needed to be configured, so that system power-off and emergency measures are adopted when broken belts are broken.
In view of this, the present patent application is specifically filed.
Disclosure of Invention
The overweight detection method disclosed by the invention aims to solve the problems in the prior art and is based on the lever moment amplification principle, and the stress deformation quantity of the overload detection spring is amplified and then transmitted to the tail end of the lever to trigger the micro switch, so that an alarm condition can be triggered within a smaller overload range, the outage of a traction electric system is effectively implemented, the overload operation of a hoist is prevented, and the driving part is protected from being damaged by stress.
The other purpose of the invention is to detect the running state of the lifting chain based on the stress deformation of the same group of overload detection springs, thereby having the design purpose of broken belt detection.
In order to achieve the design purpose, the overweight detection method is characterized in that a connecting screw rod is connected to a lifting chain which pulls the cargo platform to move vertically, and the connecting screw rod sequentially penetrates through the cargo platform, the lever connecting seat and the base; a spring is sleeved on the connecting screw rod, and the two vertical ends of the spring are respectively clamped between the lever connecting seat and the base to be in a compressed state; a lever ejector rod is hung and connected below the lever connecting seat, the bottom end of the lever ejector rod is hinged to the lever, and the proximal end of the lever is hinged to the base; the micro switch is arranged at one side of the connecting screw rod, and the far end of the lever is close to the micro switch; when the load-carrying table exceeds the upper limit of rated load, the spring is further compressed, the lever connecting seat downwards pushes the lever through the lever ejector rod, the lever downwards deflects around the near-end hinge point, and the deflection stroke of the far end of the lever is larger than the deformation distance of the spring; the remote end of the lever touches the micro-switch to trigger an alarm, the micro-switch outputs an alarm signal to the PLC of the elevator to control the power-off of the hoisting motor, and the elevator stops running.
Further, locking nuts are respectively used on the connecting screw rod and the two vertical sides of the base to lock the connecting screw rod vertically.
Further, the proximal end of the lever is hinged to the top end of the hinge base, the bottom end of the hinge base is hinged to the base, and the hinge base provides hinge and deflection support for the proximal end of the lever.
Further, the micro switch is movably connected with the arc-shaped positioning groove to adjust the positioning between the micro switch and the distal end of the lever, the distal end of the lever is provided with an arc-shaped edge, and the arc-shaped positioning groove and the distal end edge of the lever have the same radian; when the load-carrying platform exceeds the upper limit of rated load, the lever ejector rod pushes down the lever, the lever deflects downwards around the hinge point at the near end, the deflection track at the far end of the lever is arc-shaped, and the stroke is larger than the deformation distance of the spring.
Further, the travel switch is arranged at one side of the connecting screw rod, and a contact piece for triggering a travel switch detection signal is connected to the base; in the operation process of the elevator, if the lifting chain is broken, the loading platform falls down instantaneously, the spring releases the reset elastic force to prop up the connecting screw rod, the base at the bottom end of the connecting screw rod pushes out the contact piece downwards, and the contact piece moves downwards relative to the loading platform to trigger the travel switch; the travel switch outputs an alarm signal to the PLC of the elevator to control the power-off of the electrical system and take holding protection measures for the cargo platform.
Further, the overweight detection devices are simultaneously installed on the loading platform of the same elevator, the connecting screw rods of each overweight detection device are respectively connected with a group of lifting chains upwards, and the lifting chains of 2 groups bypass the same lifting motor and are connected with the same counterweight group.
In summary, the overweight detection method of the present application has the following advantages:
1. the method utilizes the rated load design of the existing elevator, based on the lever stroke amplification principle, the tiny deformation quantity of the spring can be amplified and transmitted to the lever, the larger stroke of the tail end of the lever is formed, and the micro switch is triggered, so that the smaller overload range can be accurately and timely detected, and the alarm condition can be accurately and reliably triggered.
2. Through the structural design and the method, the difference value of the spring deformation quantity is obviously reduced when the elevator is in no load and full load in the lifting direction, so that the overload detection sensitivity is improved, the alarm can be touched in a smaller overload range, and the overload detection precision is higher.
3. By using the overload detection device provided by the application, the broken chain triggering protection condition can be started by assisting with the application line 30-stroke switch, the broken belt detection device does not need to be additionally configured, the equipment cost is correspondingly reduced, and the running speed and the or stroke distance are further improved.
Drawings
The invention will now be further described with reference to the following drawings;
FIG. 1 is a schematic structural view of an overweight detection device according to the present application;
in FIG. 1, 1-connecting screw, 2-spring, 3-contact piece, 4-travel switch, 5-lever ejector pin, 6-lever, 7-micro switch, 8-cargo bed, 9-lever connecting seat, 10-base, 11-lock nut, 12-hinge seat, 13-arc-shaped positioning groove, 14-micro switch fixing plate, 15-travel switch mounting plate, 20-lifting chain, 30-lifting motor, 40-counterweight.
Detailed Description
The embodiment 1, as shown in fig. 1, the overweight detecting device applied to overload and belt breakage detection of a lifter disclosed by the application comprises a connecting screw 1, wherein the connecting screw 1 is upwards connected with a lifting chain 20, and the lifting chain 20 bypasses a lifting motor 30 and is connected with a counterweight 40 at the tail end;
a spring 2 is sleeved on the connecting screw 1, two vertical ends of the spring 2 are respectively clamped with a lever connecting seat 9 and a base 10, and the connecting screw 1 sequentially penetrates through the cargo carrying platform 8, the lever connecting seat 9 and the base 10;
lock nuts 11 are respectively sleeved on the connecting screw 1 and the two vertical sides of the base 10;
the lever connecting seat 9 is connected with a lever ejector rod 5 in a hanging way, the bottom end of the lever ejector rod 5 is hinged with the lever 6, and the proximal end of the lever 6 is hinged with the base 10.
In the process that the lever 6 is propped down, in order to prevent the lever ejector rod 5 and the lever 6 from being blocked, the proximal end of the lever 6 is hinged to the top end of the hinge seat 12, the bottom end of the hinge seat 12 is hinged to the base 10, so that flexible hinge of the proximal end of the lever 6 and deflection performance within a certain angle range are provided through the hinge seat 12, and when the lever ejector rod 5 is propped down on the lever 6, the lever 6 can deflect downwards around a hinge point with the top end of the hinge seat 12.
On the side of the connecting screw 1, the micro switch 7 is mounted on a micro switch fixing plate 14 fixed on the loading table 8, and the distal end of the lever 6 is abutted against the micro switch 7.
Based on the application of the micro switch 7, the overweight detection device is assembled according to the structure and the connection relation, and when the load carrying platform exceeds the rated load upper limit, the spring 2 is further compressed; if the cargo table 8 is loaded to 110% of rated load after being fully loaded, the deformation of the spring 2 is increased by 1.5mm, the lever connecting seat 9 downwards pushes the lever 6 by a distance of about 1.5mm through the lever ejector rod 5, and the lever 6 downwards deflects around a hinge point with the hinge seat 12; because the hinge point of the lever ejector rod 5 and the lever 6 is closer to the proximal end of the lever 6, the deflection stroke of the distal end of the lever 6 is about 2.7mm, namely the deflection stroke of the distal end of the lever 6 is amplified, and the distal end of the lever 6 touches the micro switch 7 to trigger an alarm. The micro switch 7 outputs an alarm signal to the PLC of the elevator to control the elevator motor 30 to be powered off, and the elevator stops running.
Wherein, the micro-gap switch 7 is installed in the arc-shaped positioning groove 13 on the micro-gap switch fixing plate 14 and can adjust the fixing position along the arc-shaped positioning groove 13.
Specifically, the bolt connected with the micro switch 7 penetrates through the arc-shaped positioning groove 13 and is locked at the tail end of the bolt by using a nut. When the installation position of the micro switch 7 needs to be readjusted, the bolt is directly detached from the arc-shaped positioning groove 13, then the micro switch 7 is moved along the arc-shaped positioning groove 13, and the nut is used for locking the bolt after positioning.
Correspondingly to the arcuate positioning groove 13, the distal end of the lever 6 has an arcuate edge.
Further, it is more preferable that the arc-shaped positioning groove 13 has the same arc as the distal end edge of the lever 6.
Based on the principle of the shortest straight line between the two points, the curved edge provides a greater travel distance of the distal end of the lever 6. When the lever 6 is pushed down, the lever 6 deflects around the hinge point with the top end of the hinge seat 12, the deflection travel of the distal end of the lever 6 is larger, and the magnification factor of the deflection amount of the spring 2 mapped to the deflection travel of the distal end of the lever 6 is further increased, so that the accuracy performance of triggering the alarm condition is better.
Further, on the side of the connecting screw 1, the travel switch 4 is mounted on a travel switch mounting plate 15 fixed to the load table 8; correspondingly, a contact plate 3 is connected to the base 10.
Based on the application of the travel switch 4, if the lifting chain 20 breaks during the operation of the elevator, the spring 2 releases the reset elastic force to push the connecting screw 1 down at the moment when the loading platform 8 falls down, and the base 10 at the bottom end of the connecting screw 1 pushes the contact piece 3 downward, so that the contact piece 3 moves downward relative to the loading platform 8 to trigger the travel switch 4. The travel switch 4 outputs an alarm signal to the PLC of the elevator to control the power-off of the electrical system and take other clamping protection measures for the cargo carrying platform 8, so as to prevent the cargo carrying platform 8 from falling down further to cause safety accidents.
Further, for increasing the operation safety factor of the equipment and refining each performance detection and coping capability, based on the overweight and broken belt detection structural design of simultaneously using the travel switch 4 and the microswitch 7 respectively, 2 groups of overweight detection devices are simultaneously installed on the loading platform 8 of the same elevator, the connecting screw 1 of each group of overweight detection devices is respectively connected with one group of lifting chains 20 upwards, and the 2 groups of lifting chains 20 bypass the same lifting motor 30 and are connected with the same group of counterweights 40.
Based on the structural design of the overweight detection device, the application provides the following overweight detection method:
connecting the connecting screw 1 with a lifting chain 20 which pulls the cargo carrying platform 8 to move vertically, wherein the connecting screw 1 sequentially penetrates through the cargo carrying platform 8, the lever connecting seat 9 and the base 10;
a spring 2 is sleeved on the connecting screw 1, and two vertical ends of the spring 2 are respectively clamped between the lever connecting seat 9 and the base 10 to be in a compressed state;
locking nuts 11 are respectively used on the vertical two sides of the base 10 on the connecting screw 1 to lock the connecting screw 1 vertically;
a lever ejector rod 5 is hung and connected below the lever connecting seat 9, the bottom end of the lever ejector rod 5 is hinged to the lever 6, and the proximal end of the lever 6 is hinged to the base 10;
the proximal end of the lever 6 is hinged to the top end of the hinge seat 12, and the bottom end of the hinge seat 12 is hinged to the base 10; the hinge base 12 provides flexible hinge and deflection support for the near end of the lever 6, when the lever ejector rod 5 pushes down the lever 6, the lever 6 can deflect downwards around the hinge point at the top end of the hinge base 12, and the phenomenon of the lever ejector rod 5 and the lever 6 being blocked can be effectively prevented.
The micro switch 7 is arranged on one side of the connecting screw rod 1, and the far end of the lever 6 is close to the micro switch 7;
the microswitch 7 is mounted in the arc-shaped positioning groove 13 and can adjust the positioning between the microswitch and the distal end of the lever 6 along the arc-shaped positioning groove 13, the distal end of the lever 6 is provided with an arc-shaped edge, and the arc-shaped positioning groove 13 and the distal end edge of the lever 6 have the same radian.
When the load-carrying table 8 exceeds the upper limit of rated load, the spring 2 is further compressed, the lever connecting seat 9 downwards pushes the lever 6 through the lever ejector rod 5, the lever 6 downwards deflects around the near-end hinge point, and the deflection stroke of the far end of the lever 6 is larger than the deformation distance of the spring 2;
the remote end of the lever 6 touches the micro switch 7 to trigger an alarm, the micro switch 7 outputs an alarm signal to the PLC of the elevator to control the lifting motor 30 to be powered off, and the elevator stops running.
When the load-carrying table 8 exceeds the upper limit of rated load, the lever ejector rod 5 pushes down the lever 6, the lever 6 deflects downwards around the hinge point at the near end, the deflection track at the far end of the lever 6 is arc-shaped, and the stroke is larger than the deformation distance of the spring 2.
Further, the travel switch 4 is arranged at one side of the connecting screw 1, and a contact piece 3 for triggering a detection signal of the travel switch 4 is connected to the base 10;
in the operation process of the elevator, if the lifting chain 20 breaks, the loading platform 8 falls down instantaneously, the spring 2 releases the reset elastic force to prop up the connecting screw 1, the base 10 positioned at the bottom end of the connecting screw 1 pushes out the contact piece 3 downwards, and the contact piece 3 moves downwards relative to the loading platform 8 to trigger the travel switch 4;
the travel switch 4 outputs an alarm signal to the PLC of the hoist to control the electrical system to power down and take clamp protection measures against the cargo bed 8.
Further, 2 groups of overweight detection devices are simultaneously installed on the loading platform 8 of the same elevator, the connecting screw rods 1 of each group of overweight detection devices are respectively connected with one group of lifting chains 20 upwards, and the 2 groups of lifting chains 20 bypass the same lifting motor 30 and are connected with the same group of counterweights 40.
The embodiments presented above in connection with the figures are only preferred solutions for achieving the objects of the invention. It will be apparent to those skilled in the art from this disclosure that other alternative constructions consistent with the design concept of the invention may be directly derived. Other structural features thus obtained shall also fall within the scope of the solution according to the invention.
Claims (1)
1. An overweight detection method is characterized in that a connecting screw rod is connected with a traction cargo carrying platform to vertically lift
The connecting screw rod sequentially penetrates through the cargo carrying platform, the lever connecting seat and the base;
a spring is sleeved on the connecting screw rod, and the two vertical ends of the spring are respectively clamped between the lever connecting seat and the base to be in a compressed state; locking nuts are respectively used on the connecting screw rod and the two vertical sides of the base to lock the connecting screw rod vertically;
a lever ejector rod is hung and connected below the lever connecting seat, the bottom end of the lever ejector rod is hinged to the lever, the proximal end of the lever is hinged to the top end of the hinge seat, the bottom end of the hinge seat is hinged to the base, and the hinge seat is used for providing hinge and deflection support for the proximal end of the lever;
the micro switch is arranged at one side of the connecting screw rod, and the far end of the lever is close to the micro switch; the micro switch is movably connected with the arc-shaped positioning groove to adjust the positioning between the micro switch and the distal end of the lever, the distal end of the lever is provided with an arc-shaped edge, and the arc-shaped positioning groove and the distal end edge of the lever have the same radian;
when the load-carrying table exceeds the upper limit of rated load, the spring is further compressed, the lever connecting seat downwards pushes the lever through the lever ejector rod, the lever downwards deflects around the hinge point at the near end, the deflection track at the far end of the lever is arc-shaped, and the stroke is larger than the deformation distance of the spring; the remote end of the lever touches the micro switch to trigger an alarm, the micro switch outputs an alarm signal to the PLC of the elevator to control the power-off of the elevator motor, and the elevator stops running;
the travel switch is arranged at one side of the connecting screw rod, and a contact piece for triggering a travel switch detection signal is connected to the base; in the operation process of the elevator, if the lifting chain is broken, the loading platform falls down instantaneously, the spring releases the reset elastic force to prop up the base positioned at the bottom end of the connecting screw, the base pushes out the contact piece downwards, and the contact piece moves downwards relative to the loading platform to trigger the travel switch; the travel switch outputs an alarm signal to the PLC of the elevator to control the power-off of the electrical system and take holding protection measures for the cargo platform.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111496663.3A CN114348927B (en) | 2021-12-09 | 2021-12-09 | Overweight detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111496663.3A CN114348927B (en) | 2021-12-09 | 2021-12-09 | Overweight detection method |
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| CN114348927A CN114348927A (en) | 2022-04-15 |
| CN114348927B true CN114348927B (en) | 2024-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1133756A (en) * | 1967-01-13 | 1968-11-20 | Priestman Brothers | Safe load indicator for hydraulically luffed boom of civil engineering machine |
| CN203807097U (en) * | 2014-03-10 | 2014-09-03 | 苏州艾沃意特机械设备制造有限公司 | Protection device of double-column lifting machine |
| CN205442297U (en) * | 2016-03-25 | 2016-08-10 | 宁波宏大电梯有限公司 | Elevator cab overload protection device |
| CN108275630A (en) * | 2018-04-02 | 2018-07-13 | 罗伯泰克自动化科技（苏州）有限公司 | Light stacker rope-loosing protection device |
| CN108439120A (en) * | 2018-03-28 | 2018-08-24 | 广州广日电梯工业有限公司 | A kind of elevator steel structure girder device for detecting deformation and the method for deformation analysis processing |
| CN216764090U (en) * | 2021-12-09 | 2022-06-17 | 科捷智能科技股份有限公司 | Overweight detecting device |
-
2021
- 2021-12-09 CN CN202111496663.3A patent/CN114348927B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1133756A (en) * | 1967-01-13 | 1968-11-20 | Priestman Brothers | Safe load indicator for hydraulically luffed boom of civil engineering machine |
| CN203807097U (en) * | 2014-03-10 | 2014-09-03 | 苏州艾沃意特机械设备制造有限公司 | Protection device of double-column lifting machine |
| CN205442297U (en) * | 2016-03-25 | 2016-08-10 | 宁波宏大电梯有限公司 | Elevator cab overload protection device |
| CN108439120A (en) * | 2018-03-28 | 2018-08-24 | 广州广日电梯工业有限公司 | A kind of elevator steel structure girder device for detecting deformation and the method for deformation analysis processing |
| CN108275630A (en) * | 2018-04-02 | 2018-07-13 | 罗伯泰克自动化科技（苏州）有限公司 | Light stacker rope-loosing protection device |
| CN216764090U (en) * | 2021-12-09 | 2022-06-17 | 科捷智能科技股份有限公司 | Overweight detecting device |
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