CN2217001Y - Loop type overload protection device for electric (motor) grab - Google Patents
Loop type overload protection device for electric (motor) grab Download PDFInfo
- Publication number
- CN2217001Y CN2217001Y CN 94220318 CN94220318U CN2217001Y CN 2217001 Y CN2217001 Y CN 2217001Y CN 94220318 CN94220318 CN 94220318 CN 94220318 U CN94220318 U CN 94220318U CN 2217001 Y CN2217001 Y CN 2217001Y
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- CN
- China
- Prior art keywords
- housing
- gland
- protection device
- overload protection
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Load-Engaging Elements For Cranes (AREA)
Abstract
The utility model discloses a loop type overload protection device for an electric (motor) grab. The utility model is characterized in that a hanging casing at the top is provided with a press cover which can move up and down, the center of the press cover is fixedly connected with a hanging rod, the lower end of the hanging rod is extended out of the center of the end cover of the bottom of the casing, and an operating spring is arranged between the press cover and the bottom of the casing. The utility model is also provided with travel switches, each travel is composed of a contact and a pushing block, each contact is fixed on casing, each pushing block is positioned on the travel range of the travel switch, and each pushing block can move with the press cover. When the utility model is used, when the load of the grab reaches the closed overload set value, the motor power supply can be automatically cut, and the over load can be avoided. The action is exact, and the reliability is high.
Description
The utility model relates to overload protection device, more particularly, is the closed overload protection device of a kind of electronic (motor) grab bucket.
For motor grab, after finishing the grab bucket closure, if the untimely rotation that stops closed grab bucket motor, its closed overload will cause parts to damage, and will be accidents caused.In the practical operation, crane operator is by experience, ends constantly in that grab bucket is closed on grasp opportunity, cuts off motor (motor) power supply, prevents overload.This mode, driver's labour intensity is big, has carelessness will cause closed gross overload accident in the work slightly.
In the prior art, have and on motor grab, adorn limiting device (limit switch).When closed steel rope is wound into when colliding with this limiting device along the reel guide groove, electronic (motor) grab bucket working power is cut off, and closed action is finished in grab bucket.This device is that steel rope coiling length (or the closed steel rope of grabbing bucket is extracted length out) is limited, and can not make any reaction to motor overload.For example under following two kinds of situations, this technical ineffectiveness.1, when grab bucket two jaws shovel is clamped lump material or made that because of the material resistance is excessive two jaws shovel can not close fully, it is short when closing more fully that closed steel rope is extracted length out.This moment, limiting device can not be triggered.2, closed steel rope is not fitly to be wrapped on the reel.Most situations are to be wound on desultorily together, and this moment, limiting device was obviously inoperative, and therefore, this technology can not solve electronic (motor) grab bucket overload problems.
The purpose of this utility model is to avoid existing problem in the above-mentioned prior art, provides a kind of electronic (motor) grab bucket closed overload protection device, and when reaching the closed overload of grab bucket setting value, the automatic cut-off motor power supply is avoided overload.To improve the grab bucket functional reliability, to alleviate operator's labour intensity.
The purpose of this utility model is achieved through the following technical solutions.
The utility model is in the hangable housing in top, have one can upper and lower slip gland, between gland and the housing bottom working spring is set, gland central authorities connect firmly suspension rod, stretch out from housing bottom end cap central authorities the suspension rod lower end.The travel switch that setting is made of contact and jacking block, described contact is fixed on the housing, and jacking block is on the stroke of described travel switch, and the top is with the gland displacement.
The utility model is can hang position and the suspension rod rod end that stretches out housing bottom as two coupling ends with case top, be connected in series in the closed steel rope of grab bucket, and wherein travel switch is connected in series on the motor power loop.Closed pull of steel wire produces displacement by suspension rod on gland, drive the jacking block displacement simultaneously.Because the setting of working spring, this displacement is directly proportional with pulling force, and when pulling force reached setting value, jacking block backed down the contact, and travel switch is opened, and motor power is cut off, and cuts the electricity operation automatically thereby finish, and reaches the purpose of overload protection.
The utility model has the advantages that and have higher functional reliability.The utility model is to be connected in the steel rope to use, therefore, the operator that points out in prior art carelessness, grab bucket that two jaws shovel can not close fully, steel rope twines irregularity or the like situation on reel, all can not have any impact normal operation of the present utility model because folder position lump material or material resistance are crossed ambassador.Use the utility model can greatly alleviate operator's labour intensity.
Fig. 1 is the utility model structural representation.
By the following examples, in conjunction with the accompanying drawings the utility model is further described.
Embodiment:
Referring to Fig. 1, housing 4 tops can hang, and adopt between its bottom head covers 2 and the housing 4 to be threaded.As the spring perch of working spring 3, there is gland 10 top of work bullet Huang 3 to end cap 2 simultaneously, and gland 10 can upper and lower slip in housing 4.Gland central authorities connect firmly suspension rod 1, and stretch out from housing bottom end cap 2 central authorities suspension rod 1 lower end.In the present embodiment, be provided with guiding mechanism, guiding mechanism comprises the guide groove 12 that housing 4 sidewall upper edge housings 4 are axial and is positioned at the slide block 9 of guide groove 12 that slide block 9 is fixed on the gland 10.The gland 10 that is arranged so that of guiding mechanism does not rotate at upper and lower sliding process.
In the present embodiment, travel switch has symmetrically arranged two groups, is positioned at the both sides external of housing 4.Wherein contact 5 is fixed on the exterior side wall of housing 4, and jacking block 6 is fixed on the lower end of push rod 8, and push rod 8 is fixed on the gland by the guide groove 12 that tip-lever support 11 passes on housing 4 relevant positions.In order to make the stroke scalable of travel switch, to adapt to different protection domains, be provided with sleeve pipe 13 in the outside of push rod 8, place recoil spring 7 between sleeve pipe 13 and the jacking block 6, tip-lever support 11 is fixed on the sleeve pipe 13 by setting nut 14.Change the position of tip-lever support 11 on sleeve pipe 13, can change the stroke of travel switch.
In the use, can hang position and the suspension rod rod end that stretches out housing bottom as two coupling ends, be connected in series in the closed steel rope of grab bucket with case top.Be that the fixed orifice 15 of protector with its case top is fixed on grab bucket head or the central sill in the present embodiment, the hook 16 and the steel rope termination of suspension rod rod end articulate.After the switch contact of two groups of travel switches is connected mutually, be serially connected in the motor power loop.In the normal operation, pull of steel wire is less than setting value, and the displacement L of jacking block 6 is less than the setting stroke Lmax of travel switch, and at this moment, jacking block 6 does not touch contact 5; In case pull of steel wire reaches setting value, the setting stroke Lmax of the displacement L 〉=travel switch of jacking block 6, travel switch is triggered at once, the machine operation power supply is cut off, the setting of recoil spring 7, can make jacking block 6 when bump contact 5, its impact is cushioned, and is unlikely to hard collision and causes parts to damage.
The utility model also can be applicable on the electric hoist crane, with play the limit for tonnage protective effect, installation method is: with the utility model be serially connected in the raising line end points and the supporting between.When the hoist rope pulling force reached setting value, travel switch was triggered, and the electric block working power is cut off, and reached the protection purpose.
Claims (5)
1, the closed overload protection device of a kind of electronic (motor) grab bucket is characterized in that in the hangable housing in top (4), have one can upper and lower slip gland (10).Working spring (3) is set between gland (10) and the housing bottom, and gland central authorities connect firmly suspension rod (1), and stretch out from housing bottom end cap central authorities the suspension rod lower end; The travel switch that setting is made of contact (5) and jacking block (6), described contact (5) are fixed on the housing (4), are on the stroke of described travel switch with the jacking block (6) of gland (10) displacement.
2, the closed overload protection device of grab bucket according to claim 1; it is characterized in that being provided with guiding mechanism; described guiding mechanism comprise housing sidewall upper edge housing shaft to guide groove (12) and be positioned at the slide block (9) of guide groove (12), slide block (9) is fixed on the gland (10).
3, the closed overload protection device of grab bucket according to claim 1; it is characterized in that described travel switch has symmetrically arranged two groups; be positioned at the outside both sides; its contact (5) is fixed on the exterior side wall of housing (4); jacking block (6) is fixed on the lower end of push rod (8), and push rod is fixed on the gland (10) by the guide groove (12) that tip-lever support (11) passes on housing (4) relevant position.
4, the closed overload protection device of grab bucket according to claim 3; it is characterized in that being provided with sleeve pipe (13) in the outside of push rod (8); place recoil spring (7) between sleeve pipe (13) and the jacking block (6), tip-lever support (11) is fixed on the sleeve pipe (13) by setting nut (14).
5, the closed overload protection device of grab bucket according to claim 1 is characterized in that being threaded between described housing bottom end cap (2) and the housing (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220318 CN2217001Y (en) | 1994-08-19 | 1994-08-19 | Loop type overload protection device for electric (motor) grab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220318 CN2217001Y (en) | 1994-08-19 | 1994-08-19 | Loop type overload protection device for electric (motor) grab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2217001Y true CN2217001Y (en) | 1996-01-10 |
Family
ID=33834949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94220318 Expired - Fee Related CN2217001Y (en) | 1994-08-19 | 1994-08-19 | Loop type overload protection device for electric (motor) grab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2217001Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108750947A (en) * | 2018-07-05 | 2018-11-06 | 江西飞达电气设备有限公司 | A kind of lifting weight limitor |
| CN111017711A (en) * | 2019-12-18 | 2020-04-17 | 纽科伦（新乡）起重机有限公司 | Electric grab bucket with protection function |
-
1994
- 1994-08-19 CN CN 94220318 patent/CN2217001Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108750947A (en) * | 2018-07-05 | 2018-11-06 | 江西飞达电气设备有限公司 | A kind of lifting weight limitor |
| CN111017711A (en) * | 2019-12-18 | 2020-04-17 | 纽科伦（新乡）起重机有限公司 | Electric grab bucket with protection function |
| CN111017711B (en) * | 2019-12-18 | 2021-02-12 | 纽科伦（新乡）起重机有限公司 | Electric grab bucket with protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |