CN201890724U

CN201890724U - Hoist height limit system

Info

Publication number: CN201890724U
Application number: CN2010205789961U
Authority: CN
Inventors: 邓连喜; 李斌; 袁丹
Original assignee: Sany Automobile Hoisting Machinery Co Ltd
Current assignee: Sany Automobile Hoisting Machinery Co Ltd
Priority date: 2010-10-26
Filing date: 2010-10-26
Publication date: 2011-07-06
Anticipated expiration: 2020-10-26

Abstract

The utility model discloses a hoist height limit system, which comprises a plurality of counter weight height limiters electrically connected together in series, wherein the counter weight height limiters are respectively provided with a lower pull rod non-return structure. The technical proposal of the limit system is simple and easy to implement. The PLC control point number can be reduced, and one control point is used for control.

Description

Hoisting crane height caging system

Technical field

The utility model relates to engineering machinery field, relates in particular to a kind of hoisting crane height caging system.

Background technology

The safety of hoisting crane is most important in the hoisting crane performance, so the safety guard of hoisting crane also is the key components of hoisting crane.

The weight hammer type height limitator is a kind ofly to prevent that suspension hook from rising to that the arm top does not also stop and the safety device that having an accident, and Fig. 1 shows the schematic side view of the weight hammer type height limitator of prior art.As shown in Figure 1, when weight 13 freely descends, lower link 12 stretches out limiting device body 11, its in-to-in limit switch (not shown) is in the closure state of energized, when load-engaging device rises to certain position, hold up weight, cause the limit switch normally closed contact to divide section to cut off general supply, derricking gear shuts down, and suspension hook stops to rise.

Development along with the hoisting crane technology, on the hoisting crane several height limitators often have been installed, be separately installed with height limitator such as principal arm and auxiliary (when needs use, being installed in the top of principal arm), but they work respectively in different operating modes often, and idle height limitator dismounting installation is not easily, causes installation workload very big.

The utility model content

The purpose of this utility model is to provide a kind of hoisting crane height caging system, to exempt the operation of hoisting crane dismounting height limitator when the different operating mode.

For this reason, the utility model provides a kind of hoisting crane height caging system, and it comprises a plurality of weight hammer type height limitators that are electrically connected in series in together, has the lower link non-return structure on the weight hammer type height limitator.

Further, above-mentioned non-return structure comprises locating dowel pin and the pin-and-hole that cooperates with locating dowel pin that is provided with on lower link.

Further, above-mentioned non-return structure comprise bolt and on lower link, be provided with the suitable screw of bolt.

Further, above-mentioned non-return structure comprises screw that is arranged in lower link and the double-screw bolt that screws out that is arranged in screw.

Further, above-mentioned non-return structure comprises the screw that is arranged in lower link, the double-screw bolt that matches with screw and the nut that is bolted in the double-screw bolt two ends.

Compared with prior art, hoisting crane height caging system of the present utility model has following characteristics: can reduce PLC control and count, get final product with a spot control; Do not need to plug connector, more safe and reliable; The technical solution of the utility model is simple, is skillfully constructed, and is easy to implement.

Except purpose described above, feature and advantage, other purpose, feature and the advantage that the utlity model has will be described in further detail in conjunction with the accompanying drawings.

Description of drawings

Constitute this specification sheets a part, be used for further understanding accompanying drawing of the present utility model and show preferred embodiment of the present utility model, and be used for illustrating principle of the present utility model with specification sheets.Among the figure:

Fig. 1 shows the schematic side view of the weight hammer type height limitator of prior art;

Fig. 2 shows the scheme drawing according to the weight hammer type height limitator of the utility model first embodiment;

Fig. 3 shows the disassembly status of exempting from of weight hammer type height limitator shown in Figure 2;

Fig. 4 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model second embodiment;

Fig. 5 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model the 3rd embodiment;

Fig. 6 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model the 4th embodiment;

Fig. 7 shows according to the circuit diagram of the utility model hoisting crane height caging system when normally using; And

Fig. 8 shows the circuit diagram of hoisting crane height caging system shown in Figure 7 when breaking down.

The specific embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.

Spacing measure improves the utility model at existing height, when on same hoisting crane, one or more height limitator being arranged to adapt to wherein certain several height limitator need not work the time situation.

Specific as follows: with each

height limitator

10,10 ', 10 " be electrically connected in series in together; each height limitator is in normally off when the weight freedom is sagging; as shown in Figure 7; when a certain height limitator does not need to work; take off weight; make lower link remain on the state of stretching out by the lower link non-return structure, each height limitator in-to-in limit switch all is in closure state, and the height limitator that do not need to use this moment exempts to dismantle.

For the height limitator 10 ' that works, when its in-to-in limit switch was in off-state, as shown in Figure 8, then derricking gear shut down, and other out-of-action height limitator then still is in closure state.

Because the normally closed point of height limitator is made war saferly than normal, because if height limitator is designed to normal battle, then when circuit breaks down, can't carry out spacingly, causes potential safety hazard easily.If each height limitator all in entrance point of PLC design, is then counted to PLC and has been caused waste, the utility model to take series loop shown in Figure 7, can reduce PLC control and count, get final product with a spot control.

For the height limitator that does not need to work, making its in-to-in limit switch be in closure state can make lower link remain on the state of stretching out by the lower link non-return structure.

Fig. 2 and Fig. 3 show the scheme drawing according to the weight hammer type height limitator of the utility model first embodiment.Shown in Fig. 2 and 3, the non return part in this non-return structure is a locating dowel pin 14, and this locating dowel pin is a detouchable, and is suitable with the pin-and-hole 12a on the lower link 12.When not needing this weight hammer type height limitator, locating dowel pin is inserted pin-and-hole 12a, remove weight 13, this moment, lower link 12 remained on the state of stretching out, and height limitator in-to-in limit switch is in closure state all the time, so, need not to remove this height limitator.

Fig. 4 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model second embodiment.As shown in Figure 4, the non return part in this non-return structure is a bolt 15, and this bolt 15 is detouchables, and is suitable with the screw 12b on the lower link 12.When not needing this weight hammer type height limitator, bolt 15 is screwed in the screw, make lower link 12 remain on the state of stretching out.

Fig. 5 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model the 3rd embodiment.As shown in Figure 5, the non return part in this non-return structure is a double-screw bolt 16, when lower link 12 thickness are enough wide, this double-screw bolt 16 can screw in the lower link, when not needing this weight hammer type height limitator to work, double-screw bolt 16 can be screwed out lower link, and make lower link 12 remain on the state of stretching out.

Fig. 6 shows the disassembly status of exempting from according to the weight hammer type height limitator of the utility model the 4th embodiment.As shown in Figure 6, the non return part in this non-return structure is the nut 17 at double-screw bolt 16 and double-screw bolt two ends, and so, lower link 12 can will firmly remain on the state of stretching out.

Though be appreciated that above to have enumerated to make lower link remain on the various measures of the state of stretching out, yet be not limit, can also there be other measure to make lower link remain on the state of stretching out, for example on limiting device body 11, locating dowel pin etc. is set.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. a hoisting crane height caging system is characterized in that, comprises a plurality of weight hammer type height limitators that are electrically connected in series in together, wherein, has the lower link non-return structure on the described weight hammer type height limitator.

2. hoisting crane height caging system according to claim 1 is characterized in that, described non-return structure comprises locating dowel pin and the pin-and-hole that cooperates with described locating dowel pin that is provided with on described lower link.

3. hoisting crane height caging system according to claim 1 is characterized in that, described non-return structure comprise bolt and on described lower link, be provided with the suitable screw of described bolt.

4. hoisting crane height caging system according to claim 1 is characterized in that, described non-return structure comprises the screw that is arranged on the described lower link and is positioned at the double-screw bolt that screws out of described screw.

5. hoisting crane height caging system according to claim 1 is characterized in that, described non-return structure comprises the screw that is positioned at described lower link, the double-screw bolt that matches with described screw and the nut that is bolted in described double-screw bolt two ends.