CN202880777U - Fork truck weighing device with offset load function - Google Patents
Fork truck weighing device with offset load function Download PDFInfo
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- CN202880777U CN202880777U CN 201220012025 CN201220012025U CN202880777U CN 202880777 U CN202880777 U CN 202880777U CN 201220012025 CN201220012025 CN 201220012025 CN 201220012025 U CN201220012025 U CN 201220012025U CN 202880777 U CN202880777 U CN 202880777U
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Abstract
A fork truck weighing device with offset load function is expected to detect weight and monitor lifting state of a fork truck during a fork truck working process, and prevent broken of chain and damage of cargo due to overweight or load offset of the fork truck. A force transducer can be rapidly installed, and is especially suitable for reconstruction of a conventional fork truck. The utility model provides two kinds of force transducer, namely, a cartridge type force transducer and a draw rod type force transducer. Two sensors are installed at a fixing end of a lifting chain. Installation can be completed by unscrewing fixing nuts of the lifting chain. The cartridge type force transducer has a spherical surface bearing part, thereby ensuring the uniform force bearing of the sensor. The installation mode of the draw rod type force transducer ensures uniform loading.
Description
Technical field
The utility model relates to a kind of Weight detecting device, is particularly useful for the transformation to the active service fork truck, not only can realize demonstration and the record of fork truck hoisting capacity, and has effectively prevented fork truck overweight or the caused mechanical breakdown of unbalance loading and cargo damage.
Background technology
Fork truck is a kind of handbarrow that is widely used in the fields such as goods yard, workshop, storage, and along with the development of economic construction and logistics, the recoverable amount of fork truck sharply increases.
In the loading and unloading and circular flow of goods, the turnover of freight traffic of every day is one of important indicator of being concerned about of production control personnel or forklift operator personnel, therefore be equipped with weighing system for fork truck, make it in the carrying of carrying out goods, realize demonstration and the record of hoisting capacity, provide greatly convenient for producing operating personal.The forklift operator personnel also can pass through the Display Realization of weight to effective supervision of fork truck lifting work state simultaneously, ensure the safe operation of fork truck.
In the fork truck working process, because the installation site of pallet fork is asymmetric, or the off-centre of weight itself, all can cause the unbalance loading of fork truck, when unbalance loading is serious, not only can break the chain that hoists, also can cause cargo damage simultaneously, even may result in personal injury caused by an accident.Therefore the forklift operator personnel wish to monitor at any time the fork truck mode of operation, and particularly overweight or unbalance loading state is in time adjusted the forklift operator mode, can effectively prevent the related responsible accidents such as the mechanical breakdown of fork truck and cargo damage.Therefore at the active service fork truck fork truck weighing system with unbalanced-loading preventing function being installed has important practical significance.
Along with the increase of fork truck weighing demand, continue to bring out about patent of invention and the utility model patent of Balancer for fork trucks.Provide a kind of weighing box that is formed by header board, rear plate and sensor such as patent 200720113338.3, be installed between pallet fork and the goods shelf.The method structure is comparatively complicated, is not easy to the transformation of existing fork truck.Patent 200620168203.2 provides a kind of fork truck weighing instrument, and the weighing unit of this weighing instrument is the pressure sensor that is installed on the load lifting cylinder oil circuit, consists of the gravimetric data sense channel of micro controller system by A/D converter.The method belongs to indirect metering system, also needs the fork truck oil circuit is transformed.Patent 200720038323.5 is similar with foregoing invention, also is by adopting the measurement oil pressure to change indirect weighing.Patent 200920232387.8 has been introduced a kind of hanging plate-type forklift truck scale, detects cargo weight by force transducer is installed between front forked frame and rear crotch, and the method belongs to direct weighing mode, and error is less, but complex structure is unfavorable for the transformation to the active service fork truck.
The utility model content
In order to solve the fork truck Weighing apparatus difficulty is installed, be not easy to the active service fork truck such as is transformed at the problem, the utility model has been introduced a kind of fork truck unbalanced-loading preventing weighing system based on resistance-strain type of dynamometer sensor, both, fixed end at the forklift lifting chain is installed rod-pulling type or cartridge type resistance-strain force transducer, realizes the purpose of weighing by detecting chain pull.Rod-pulling type force transducer one end is fork configuration, is connected with the bearing pin of chain internode, and the other end is screw rod, directly is fixed on the L-type framework with nut.Cartridge type force transducer with ball ring mechanism is enclosed within on the bolt of forklift lifting chain fixed end, between L-type framework and clamp nut.The output signal of sensor through signal condition, is shown and record by the weight display instrument.Its maximum characteristics are:
One, easy for installation.Two force transducer symmetries are installed in the fixed end of the chain that hoists, and need not carry out any repacking to fork truck, only need unload the jam nut of lower chain fixed end, just can realize the installation of sensor, are particularly suitable for the transformation to existing fork truck.(see figure 1)
Its two, can in time monitor the overweight or unbalance loading state of mode of operation, especially fork truck in the fork truck lifting process.Operating personal can show according to system be adjusted the fork truck mode of operation, has effectively prevented from having saved the maintenance fund owing to load-bearing chain overweight or that unbalance loading causes is broken, cargo damage and contiguous obligations thereof, has ensured the normal operation of fork truck.(see figure 7)
Its three, application result proves, force transducer is installed in the fixed end of forklift lifting chain, fork truck hoist and the pitching operation on not impact of sensor output, working sensor is in stable condition.(see figure 6)
Its four because simple in structure, the technology maturation of resistance-strain type of dynamometer sensor, accurate measurement.The fork lifter weighting system dependable performance that forms thus can satisfy the operating environment of fork truck fully, for the realization of fork lifter weighting system provides technical guarantee.
Technical scheme
Having the technical scheme that the fork truck weighing system of unbalanced-loading preventing function adopts is, force transducer 7(is installed symmetrically sees Fig. 1 at the hoist upper fixed end of chain 5 of two of fork trucks), realize detection to cargo weight by the hoist pulling force of chain of detection.
One end of forklift lifting chain is installed on the crotch 2, and the other end is walked around on the L shaped framework 6 that floating chain wheels is fixed on outer mast.In fork truck lifting process, the plunger of lifting hydraulic cylinder 10 promotes unsteady crossbeam and floating chain wheels motion, and crotch 3 hoists under the traction of chain with weight and descends.Because the chain that hoists is flexible member, effect that therefore can only bearing tension, this pulling force is the summation of crotch and cargo weight, because crotch weight is definite value, so deducts crotch weight then be the weight of goods from the summation of the chain bearing tension that hoists.
According to the difference of forklift lifting chain fixed form and the difference of fork truck rated load weight, LOAD CELLS is divided into two kinds, both: rod-pulling type force transducer and sleeve-type force transducer.Be the rod shaped structure (see figure 5) in the middle of the rod-pulling type sensor, an end is fork-shaped, can be installed in easily on the bearing pin of chain.The other end is screwed screw rod, is fixed on the L shaped framework of outer mast the pulling force (see figure 3) of rod-pulling type sensor direct feeling chain in the fork truck lifting process by jam nut.
The sleeve-type force transducer is the tubular structure (see figure 4), is enclosed within on the screw rod of the chain ends that hoists, and is installed between L shaped fixed frame and the captive nut.Sleeve-type sensor pressurized (see figure 2) when hoisting the chain tension.
The large-tonnage fork truck should adopt the rod-pulling type load-sensing unit generally speaking, and little tonnage fork car should adopt the sleeve-type load-sensing unit.
The force transducer of fork lifter weighting system adopts resistance strain type sensor, and technology maturation is reliable.By the appropriate design of elastic element and load member, reasonably paster can be eliminated the metering error that the fork truck pitching produces with group bridge mode.
The weight of fork truck weighing system shows and adopts weight display instrument, this instrument to have the functions such as demonstration, zero clearing, peeling, cumulative, unbalance loading demonstration and warning, storage, and can be equipped with print unit according to customer requirements.The output signal of resistance strain type sensor is transported to A/D converter, is processed and shown and record according to user instruction by micro controller system by interface.With the supporting display instrument technology maturation of resistive transducer, reliability is strong.
Beneficial effect
The beneficial effects of the utility model are:
1. the fork truck weighing system has convenient and swift mounting means, is not changing original fork lift truck structure, the fork truck part is not made in the situation of any modification, realizes the Fast Installation of weighing sensor, is very easy to the user.Therefore installation site and the installation method of sensor are gordian techniquies of the present utility model.
2. two related sensor of fork lifter weighting system, simple in structure, easy for installation, signal stabilization, life-span are long, can satisfy the various working condition requirements of fork truck.
3. because two force transducer symmetries are installed in the fixed end of the chain that hoists, mode of operation that therefore can the effecting reaction fork truck, special unbalance loading state.Therefore this system can realize fork truck lifting condition monitoring, has effectively prevented because accidents such as hoist chain breakage and the related property damage that overweight or serious unbalance loading causes, personal safeties, for equipment safety operation provides guarantee.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described further.
Fig. 1 is simplified schematic diagram of the present invention
Fig. 2 is sleeve-type force transducer installation site and installation method
Fig. 3 is rod-pulling type force transducer installation site and installation method
Fig. 4 is sleeve-type force transducer scheme drawing of the present invention
Fig. 5 is rod-pulling type force transducer scheme drawing of the present invention
Fig. 6 is in the forklift lifting weight process, the output signal of force transducer
Fig. 7 is the output signal of fork truck pitching process force transducer
Fig. 8 is that force transducer is to the response of fork truck limit unbalance loading state
The specific embodiment
Fork truck weighing system with unbalanced-loading preventing function comprises two types sensor, can select according to fork lift truck structure characteristics, hoisting capacity and customer requirements.
Fig. 1 is forklift lifting mechanism installation of sensors scheme drawing among the present invention.1 is fork of forklift truck among the figure, and 2 is commodity shelf system, and 3 is outer gate seat, and 4 is sprocket wheel, and 5 is lifting chain, and 6 is the L-type fixed frame, and 7 is sensor, and 8 is captive nut, and 9 is screw rod, and 10 is elevating ram, and 11 are the pitching oil cylinder.
The dynamometry sensor is installed on the fixed end L-type fixed frame 6 of chain 5.During the fork truck lifting, elevating ram 10 promotes sprocket wheel and rises, and chain-driving shelf 2 rise the lifting that realizes weight with pallet fork 1.In fork truck lifting process, chain bears the total weight of goods and goods shelf system.Because the weight of goods shelf system is certain, the weight that deducts the goods shelf system from total weight then is the weight of goods, therefore by detecting the pulling force of chain, can realize the purpose that goods is weighed.
Fig. 2 is mounting means and the installation site of sleeve-type force transducer.Sleeve-type force transducer 7 is enclosed within on the screw rod 9, between L-type framework 6 and captive nut 8, fixes by nut.When the forklift lifting weight, chain 5 tensions, screw rod is tension also.The sleeve-type force transducer between L-type fixed frame and jam nut, under the effect of screw rod pulling force, the sensor pressurized.The size of pressure has directly been reacted the hoisting capacity of fork truck, thereby reaches the purpose of weighing.
Fig. 3 is the mounting means of rod-pulling type force transducer.One end of sensor 7 has fork configuration, is connected with the bearing pin of chain 5, and the other end is fixed on the L-type framework 6 with nut 8.When the forklift lifting weight, the direct tension of the force transducer that is connected with chain, the hoisting capacity of fork truck is reacted by the size of sensor pulling force.
The output signal of two-way force transducer is transferred in the weight display instrument by interface, and this instrument has the functions such as zero clearing, peeling, cumulative, unbalance loading demonstration and warning, storage.Also can according to the plug-in chopping machine of customer requirements, realize data-printing simultaneously.The display instrument of fork lifter weighting system can be installed near the operator's station, and the convenient operation person observes.
Fig. 4 is the structural representation of cartridge type force transducer.1 is sensor body among the figure, and 3 is sensor protective cover, is provided with signaling interface 2 at protective case, the strain-gauge output signal can be caused signal analysis and display system.4 for having the load member of sphere, plays the effect of all carrying.
Fig. 5 is the structural representation of rod-pulling type force transducer.1 is sensor body, install for convenient, and the fork configuration of top for matching with the chain hinge pin that hoists, the bottom is helicitic texture.3 is sensor protective cover, and signaling interface 2 is positioned on the protective case.4 is the holding screw of protective case, plays the fixedly effect of protective case.φ is the size corresponding with the chain hinge pin that hoists among the figure, and m should be consistent with diameter and the screw thread specification of screw rod 3.
D among Fig. 4,5, d1, d2, h equidimension can be carried out Seriation Design according to the hoisting capacity of fork truck and the chain structure that hoists.
In the fork truck working process, two side senser output sums are crotch weight and fork truck hoisting capacity sum, therefore after installation of sensors, should at first measure crotch weight under light condition, and after carrying out zero clearing and process by display instrument, the instrument displayed value then is the true hoisting capacity of fork truck.
Fig. 6 is present embodiment is installed in chain place, both sides force transducer in the forklift lifting process output signal, among the figure, ordinate be output voltage (volt/V), abscissa be production time (millisecond/ms).As seen from the figure, in the forklift lifting process, the output voltage amplitude absolute value of both sides force transducer equates that in whole lifting production time (285000ms), signal amplitude is stable, illustrate lifting operation at fork truck on weighing system without impact.
Fig. 7 is present embodiment is installed in chain place, both sides force transducer in fork truck pitching process output signal, its ordinate is output voltage (V), abscissa is production time (ms), as seen from the figure, in twice pitching process of fork truck (250000ms), the output signal amplitude of the force transducer of both sides is substantially equal, illustrates that the pitching operation of fork truck is on not impact of weighing system.
Fig. 8 is in the present embodiment, the output voltage signal of force transducer when fork truck is in limit unbalance loading state, both, when weight departs from the pallet fork line of centers, forklift lifting chain unbalance stress, one side force is large, another side force is little, and two force transducer output voltage amplitude absolute values differ greatly, and in the time (60000ms), voltage signal is unstable at forklift workability, therefore the output voltage of two side sensers has reflected the mode of operation of fork truck truly, checking system can start warning according to the difference of two sensors output voltage, reminds forklift operator personnel adjustment forklift workability state, prevents from breaking the generation of the contingencies such as chain.
Claims (3)
1. the forklift weighing device that has the unbalanced-loading preventing function comprises: two kinds of resistance-strain type of dynamometer sensor of cartridge type and rod-pulling type, it is characterized in that: the rod-pulling type force transducer is installed in the upper fixed end of forklift lifting chain, rod-pulling type force transducer one end is fork configuration, be connected with the bearing pin of chain internode, the other end is screw-rod structure, directly be fixed on the L-type framework with nut, the cartridge type force transducer is enclosed within on the bolt of forklift lifting chain fixed end, between L-type framework and clamp nut, the output signal of sensor, through signal condition, shown and record by the weight display instrument.
2. described forklift weighing device with unbalanced-loading preventing function according to claim 1, the mounting means of rod-pulling type resistance-strain force transducer be, unloads the screw rod that is installed in fixed end head on the chain, replaces it by the rod-pulling type sensor, passes through nut locking.
3. described forklift weighing device with unbalanced-loading preventing function according to claim 1, cartridge type resistance-strain force transducer has carrying ball ring mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220012025 CN202880777U (en) | 2012-01-12 | 2012-01-12 | Fork truck weighing device with offset load function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220012025 CN202880777U (en) | 2012-01-12 | 2012-01-12 | Fork truck weighing device with offset load function |
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| CN202880777U true CN202880777U (en) | 2013-04-17 |
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| CN 201220012025 Expired - Fee Related CN202880777U (en) | 2012-01-12 | 2012-01-12 | Fork truck weighing device with offset load function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030044A (en) * | 2013-06-01 | 2014-09-10 | 昆山夏福特五金电子科技有限公司 | Novel packing machine used for logistics |
| CN104891390A (en) * | 2015-05-27 | 2015-09-09 | 青岛理工大学 | Forklift unbalance loading detecting method |
| CN107473149A (en) * | 2017-10-19 | 2017-12-15 | 荆门创佳机械科技有限公司 | A kind of forklift lifts overweight warning device |
| CN110485775A (en) * | 2019-08-27 | 2019-11-22 | 贵州海悦科技立体停车设备有限公司 | Vertical circulation stereo garage weighing system |
| CN112499524A (en) * | 2020-11-24 | 2021-03-16 | 宁波朗科称重设备有限公司 | Material lifting, carrying and metering logistics equipment |
| CN114235114A (en) * | 2021-12-06 | 2022-03-25 | 河南嘉晨智能控制股份有限公司 | Ultrasonic weight measuring method |
| CN114590748A (en) * | 2022-03-31 | 2022-06-07 | 河南中烟工业有限责任公司 | Stacker carrying platform load early warning calibration detection device and method |
| CN116242537A (en) * | 2023-05-11 | 2023-06-09 | 西南交通大学 | Method, device and system for monitoring overload and unbalanced load of flat car and readable storage medium |
-
2012
- 2012-01-12 CN CN 201220012025 patent/CN202880777U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030044A (en) * | 2013-06-01 | 2014-09-10 | 昆山夏福特五金电子科技有限公司 | Novel packing machine used for logistics |
| CN104891390A (en) * | 2015-05-27 | 2015-09-09 | 青岛理工大学 | Forklift unbalance loading detecting method |
| CN104891390B (en) * | 2015-05-27 | 2017-02-22 | 青岛理工大学 | Forklift unbalance loading detecting method |
| CN107473149A (en) * | 2017-10-19 | 2017-12-15 | 荆门创佳机械科技有限公司 | A kind of forklift lifts overweight warning device |
| CN110485775A (en) * | 2019-08-27 | 2019-11-22 | 贵州海悦科技立体停车设备有限公司 | Vertical circulation stereo garage weighing system |
| CN112499524A (en) * | 2020-11-24 | 2021-03-16 | 宁波朗科称重设备有限公司 | Material lifting, carrying and metering logistics equipment |
| CN114235114A (en) * | 2021-12-06 | 2022-03-25 | 河南嘉晨智能控制股份有限公司 | Ultrasonic weight measuring method |
| CN114235114B (en) * | 2021-12-06 | 2024-03-29 | 河南嘉晨智能控制股份有限公司 | Ultrasonic weight measurement method |
| CN114590748A (en) * | 2022-03-31 | 2022-06-07 | 河南中烟工业有限责任公司 | Stacker carrying platform load early warning calibration detection device and method |
| CN114590748B (en) * | 2022-03-31 | 2024-02-20 | 河南中烟工业有限责任公司 | Stacker cargo carrying platform load early warning calibration detection device and method |
| CN116242537A (en) * | 2023-05-11 | 2023-06-09 | 西南交通大学 | Method, device and system for monitoring overload and unbalanced load of flat car and readable storage medium |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20140112 |