CN216072856U - Limit switch assembly for lifting of endless chain electric hoist - Google Patents
Limit switch assembly for lifting of endless chain electric hoist Download PDFInfo
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- CN216072856U CN216072856U CN202122251526.5U CN202122251526U CN216072856U CN 216072856 U CN216072856 U CN 216072856U CN 202122251526 U CN202122251526 U CN 202122251526U CN 216072856 U CN216072856 U CN 216072856U
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Abstract
The utility model discloses a limit switch assembly for lifting an electric chain hoist, which comprises a first collision block elastically supported on a lower hook frame part, a second collision block elastically supported on a chain blocking block, an elastic pressing piece for ascending and an elastic pressing piece for descending which are respectively fixed at the bottom of a reducer body, and limit switch contacts of an upper stop point and a lower stop point which are respectively fixed in the reducer body at intervals, wherein the elastic pressing piece for ascending and the elastic pressing piece for descending respectively have deformation amounts which can be contacted with the corresponding limit switch contacts. After the scheme is adopted, the first collision block firstly collides the ascending elastic pressing piece for ascending when the load ascends, the second collision block firstly collides the descending elastic pressing piece for descending when the no-load descends, and the corresponding limit switch contact is pressed by means of respective elastic deformation of the ascending elastic pressing piece and the descending elastic pressing piece, so that the stress of the corresponding limit switch contact is soft, the impact acting force of the corresponding collision block is relieved, and the frequent impact damage of the limit switch is avoided.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a chain electric hoist, in particular to a limit switch assembly for lifting the chain electric hoist.
[ background of the utility model ]
In the existing electric chain hoist, the hoisting and the no-load descending are both limited, so as to prevent the lifting hook component from impacting the top in a load state, and prevent the chain block from impacting the machine body in the no-load state, therefore, a corresponding limit switch is usually configured in the machine body, and the load section and the no-load section of the hoisting chain are respectively configured with a collision block capable of triggering the limit switch to act, because the collision block is a solid metal block, and the contact of the limit switch is tiny, and the two are in a rigid impact mode, the limit switch is frequently damaged and failed after being subjected to rigid impact, and the limit switch has the defect of short service life, thereby affecting the safety of the lifting operation process of the electric chain hoist.
In addition, because the limit switch is fixedly installed in the machine body, the collision block ascends and descends along with the hoisting chain, the lower hook part and the hoisting chain are easy to shake along with the swinging of the hoisted object in the hoisting process, and the collision block is in the fault condition that the collision block is not effectively triggered when the collision block is lifted to the limit position and touches the limit switch.
[ Utility model ] content
Aiming at the defects in the prior art, the utility model aims to provide a limit switch assembly for lifting a chain electric hoist.
Therefore, the utility model adopts the following technical scheme:
the utility model provides a limit switch subassembly that electric block of endless chain goes up and down to use, includes that elastic support rises the first bump piece of usefulness on hook frame part down, the second bump piece of usefulness is descended in the confession of elastic support on the fender chain piece to and interval fixed mounting respectively goes up the dead center limit switch contact in the reduction gear organism, lower dead center limit switch contact, first bump is located the below of dead center limit switch contact, and the second bump is located the below of lower dead center limit switch contact, and its improvement point lies in: the elastic pressing piece for rising and the elastic pressing piece for falling are respectively fixed at the bottom of the speed reducer body, the elastic pressing piece for rising has a deformation amount which can be contacted with the contact of the upper stop limit switch, and the elastic pressing piece for falling has a deformation amount which can be contacted with the contact of the lower stop limit switch.
The elastic pressing piece for ascending is a U-shaped plate spring and comprises a bending part and two mounting legs which are used for being attached to the bottom of the reducer body and fixedly connected with the reducer body, the position height of the bending part is lower than the mounting heights of the two mounting legs, a gap which is matched with the bending part up and down is formed between the upper stop limit switch contact and the bending part, and the deformation quantity of the bending part is larger than the gap; the elastic pressing piece for descending is a U-shaped plate spring and comprises a bending part and two mounting feet which are used for being attached to the bottom of the speed reducer body and fixedly connected with the bottom of the speed reducer body, the position height of the bending part is lower than the mounting heights of the two mounting feet, the contact of the lower stop limit switch and the bending part are provided with a gap which is matched with each other up and down, and the deformation amount of the bending part is larger than the gap.
The effective surface area of the bending part of the elastic pressing part for lifting, which can be abutted against the contact of the upper dead point limit switch, is larger than the cross section of the contact of the upper dead point limit switch; the effective surface area of the bending part of the elastic pressing part for descending, which can be abutted against the lower dead point limit switch contact, is larger than the cross section of the lower dead point limit switch contact.
The mutual positions of the elastic abutting piece for ascending and the contact of the upper stop limit switch are relatively fixed, the mutual positions of the elastic abutting piece for descending and the contact of the lower stop limit switch are relatively fixed, and the effective surface area of the bent part of the elastic abutting piece for ascending abutting against the contact of the upper stop limit switch is larger than the cross section of the contact of the upper stop limit switch, so that the effectiveness of the contact of the limit switch under the triggering action is improved, the fault of the triggering action is avoided, and the elastic abutting piece is particularly beneficial to the fact that the first collision block is easy to shake along with the swinging of a hanging object in the lifting process, and the fault probability that the first collision block is not effectively triggered due to triggering is reduced.
The utility model has the following advantages and beneficial effects:
the defect that the service life of a limit switch is short due to the fact that collision blocks directly impact a limit switch contact in the prior art in a rigid and continuous mode is overcome, after an elastic pressing part for ascending and an elastic pressing part for descending are respectively added, a first collision block firstly impacts the elastic pressing part for ascending in the load ascending process, and a second collision block firstly impacts the elastic pressing part for descending in the no-load descending process, and the elastic deformation of the elastic pressing part for ascending and the elastic pressing part for descending are pressed and acted on corresponding limit switch contacts, so that the corresponding limit switch contacts are soft in stress, the impact force of the corresponding collision blocks is relieved, frequent impact damage of the limit switch is avoided, the service life of the limit switch is prolonged, and the safety of the lifting operation process of the ring chain electric block is improved.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a limit switch assembly of the present invention mounted on a chain hoist;
FIG. 2 is a cross-sectional view of FIG. 1;
fig. 3 is a perspective view of the elastic pressing member for ascending (descending);
fig. 4 is a front view of the elastic pressing member for ascending (descending).
[ detailed description ] embodiments
Referring to fig. 1, 2, 3 and 4, a limit switch assembly for lifting a chain-link electric hoist comprises a first bump 5 elastically supported on a lower hook frame member 7 for ascending with load or without load, a second bump 6 elastically supported on a chain stopper 8 for descending with load or without load, and an upper-dead-point limit switch contact 1 and a lower-dead-point limit switch contact 2 fixedly installed in a reducer body M at intervals, respectively, wherein the first bump 5 is located below the upper-dead-point limit switch contact 1, and the second bump 6 is located below the lower-dead-point limit switch contact 2, and the improvement points are as follows: the elastic pressing piece 3 for rising and the elastic pressing piece 4 for falling are respectively fixed at the bottom of the speed reducer body M, the elastic pressing piece 3 for rising has a deformation amount which can be contacted with the upper stop limit switch contact 1, and the elastic pressing piece 4 for falling has a deformation amount which can be contacted with the lower stop limit switch contact 2.
In the division of the hoisting chain Q, it is customary to call a hoisting chain segment engaged with a hoisting sprocket (not indicated) to a section of the hoisting chain fixedly connected between the links of the lower hook member 7 a load segment Q1, and a section of the hoisting chain adjacent to said one link to a section of the hoisting chain fixedly connected between the tail links of the chain stopper 8 an idle load segment Q2; the first impact mass 5 is free-running on the load section Q1 and is supported on the lower hook part 7 by means of a spring K1, and the second impact mass 6 is free-running on the idle section Q2 and is supported on the catch block 8 by means of a spring K2, as is known in the art.
The first impact block 5 and the second impact block 6 have the same structure and can be universally interchanged; the upper dead point limit switch and the lower dead point limit switch have the same structure and can be universally interchanged.
The elastic pressing piece 3 for rising is arranged between the limit switch contact 1 at the top dead center and the first impact block 5, and specifically, the elastic pressing piece 3 for rising is fixed on a bottom plate M1 of the speed reducer body M; the descending elastic pressing member 4 is disposed between the bottom dead center limit switch contact 2 and the second impact mass 6, and the descending elastic pressing member 4 is also fixed to the bottom plate M1.
The elastic pressing piece 3 for lifting is a U-shaped plate spring and comprises a bending part 31 and two mounting feet 32 which are used for being attached to the bottom of the speed reducer body M and fixedly connected, the position height of the bending part 31 in a free state is lower than the mounting height of the two mounting feet 32, a clearance which is matched with the bending part 31 up and down is formed between the upper stop limit switch contact 1 and the bending part 31, and the deformation quantity of the bending part 31 is larger than the clearance; the descending elastic pressing member 4 is also a U-shaped plate spring, and includes a bending portion 41 and two mounting legs 42 which are used for being attached to the bottom of the reducer body M and fixedly connected, the height of the bending portion 41 in a free state is lower than the mounting height of the two mounting legs 42, the lower dead point limit switch contact 2 and the bending portion 42 have a clearance which is matched with each other up and down, and the deformation amount of the bending portion 42 is larger than the clearance.
The strokes of the upper stop limit switch contact 1 and the lower stop limit switch contact 2 are both 1-2 mm; the interval between the bent portion 31 of the elastic pressing member 3 for rising and the top dead center limit switch contact 1 is 4mm, and the interval between the bent portion 41 of the elastic pressing member 4 for falling and the bottom dead center limit switch contact 2 is 4 mm.
The effective surface area of the bending part 31 of the elastic pressing part 3 for rising, which can be abutted against the top dead center limit switch contact 1, is larger than the cross section of the top dead center limit switch contact 1; the effective surface area of the bending part 41 of the elastic pressing part 2 for descending, which can be abutted against the lower dead point limit switch contact 2, is larger than the cross section of the lower dead point limit switch contact 2.
Claims (3)
1. The utility model provides a limit switch subassembly that electric block of endless chain goes up and down to use, includes that elastic support rises the first bump piece of usefulness on hook frame part down, the second bump piece of usefulness is descended in the confession of elastic support on the chain stopper piece to and respectively interval fixed mounting in the reduction gear organism the top dead center limit switch contact, lower dead center limit switch contact, first bump is located the below of top dead center limit switch contact, and the second bump is located the below of lower dead center limit switch contact, its characterized in that: the elastic pressing piece for rising and the elastic pressing piece for falling are respectively fixed at the bottom of the speed reducer body, the elastic pressing piece for rising has a deformation amount which can be contacted with the contact of the upper stop limit switch, and the elastic pressing piece for falling has a deformation amount which can be contacted with the contact of the lower stop limit switch.
2. The limit switch assembly for lifting the electric chain hoist according to claim 1, wherein: the elastic pressing piece for ascending is a U-shaped plate spring and comprises a bending part and two mounting feet which are used for being attached to the bottom of the reducer body and fixedly connected with the reducer body, the position height of the bending part is lower than the mounting heights of the two mounting feet, a gap which is matched with the bending part up and down is formed between the upper stop limit switch contact and the bending part, and the deformation quantity of the bending part is larger than the gap; the elastic pressing piece for descending is a U-shaped plate spring and comprises a bending part and two mounting feet which are used for being attached to the bottom of the speed reducer body and fixedly connected with the bottom of the speed reducer body, the position height of the bending part is lower than the mounting heights of the two mounting feet, the contact of the lower stop limit switch and the bending part are provided with a gap which is matched with each other up and down, and the deformation amount of the bending part is larger than the gap.
3. The limit switch assembly for lifting the electric chain hoist according to claim 2, characterized in that: the effective surface area of the bending part of the elastic pressing part for rising, which can be abutted against the contact of the upper dead point limit switch, is larger than the cross section of the contact of the upper dead point limit switch;
the effective surface area of the bending part of the elastic pressing part for descending, which can be abutted against the lower dead point limit switch contact, is larger than the cross section of the lower dead point limit switch contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251526.5U CN216072856U (en) | 2021-09-07 | 2021-09-07 | Limit switch assembly for lifting of endless chain electric hoist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251526.5U CN216072856U (en) | 2021-09-07 | 2021-09-07 | Limit switch assembly for lifting of endless chain electric hoist |
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| Publication Number | Publication Date |
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| CN216072856U true CN216072856U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122251526.5U Active CN216072856U (en) | 2021-09-07 | 2021-09-07 | Limit switch assembly for lifting of endless chain electric hoist |
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| CN (1) | CN216072856U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115581595A (en) * | 2022-09-27 | 2023-01-10 | 山东德鲁克起重机集团有限公司 | Automatic flexible rehabilitation suspension system |
-
2021
- 2021-09-07 CN CN202122251526.5U patent/CN216072856U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115581595A (en) * | 2022-09-27 | 2023-01-10 | 山东德鲁克起重机集团有限公司 | Automatic flexible rehabilitation suspension system |
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