CN203845706U - Overload limiting and alarming device - Google Patents
Overload limiting and alarming device Download PDFInfo
- Publication number
- CN203845706U CN203845706U CN201420210727.8U CN201420210727U CN203845706U CN 203845706 U CN203845706 U CN 203845706U CN 201420210727 U CN201420210727 U CN 201420210727U CN 203845706 U CN203845706 U CN 203845706U
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- China
- Prior art keywords
- relay
- closed contact
- normally closed
- coil
- contact
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- Withdrawn - After Issue
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Abstract
The utility model discloses an overload limiting and alarming device and relates to the technical field of manufacture of hydraulic cranes and hauling machines. The overload limiting and alarming device comprises a pressure relay, an intermediate switch and a sound-light alarming element, wherein the pressure relay is arranged in a hydraulic oil circuit; the intermediate switch and the sound-light alarming element are arranged on an operation handle; a normally-closed contact of the pressure relay is connected to a coil of a first relay; a normally-closed contact of the first relay is connected to a coil of a second relay; a normally-closed contact of the second relay is connected to a coil of a rising magnetic exchange valve. The overload limiting and alarming device can be used for solving the problems of long maintenance time and low efficiency when the overload alarming device of the hydraulic crane has fault.
Description
Technical field
The utility model relates to hydraulic lift, hauling machine manufacturing technology field, especially a kind of overload restriction warning device for hydraulic lift overload.
Background technology
At present in the utilization of hydraulic lift, hauling machine, overload restriction warning device generally detects the pulling force signal on steel rope by force transducer, this signal is generally analog signals, this analog signals is transferred to jamming in computer CPU center, in CPU processing enter after various mathematical logic calculation process, export a switching value signal, and this train of signal is received in the control hoisting circuit of hoisting crane, when the lifting tonnage of hoisting crane surpasses setting value, the propulsion source that cuts off riser circuit, stops the vertical motion of hoisting crane; The sound and light alarm device work such as the switching value signal driver indicator lamp of utilization output simultaneously, buzzer phone, when cutting off hoisting crane vertical motion, send sound and light alarm.Above mode be no matter force transducer body with and power taking mounting means, or the system such as jamming in computer CPU center more complicated all, if after et out of order, needs professional engineering staff to keep in repair, so maintenance time is long, efficiency is low.
Utility model content
The purpose of this utility model is to provide a kind of overload restriction warning device, and when the overload alarm that it can solve hydraulic lift breaks down, maintenance time is long, inefficient problem.
In order to address the above problem, the technical solution adopted in the utility model is: this overload restriction warning device, comprise the pressure relay being arranged in hydraulic circuit, be arranged on the middle bit switch on operating handle, one end of the normally closed contact of described pressure relay, one end of the contact of described middle bit switch, one end of the first normally closed contact of the first relay is connected and is connected with a utmost point of power supply with the first and second open contacts of the second relay and each one end of normally closed contact; the other end of the normally closed contact of described pressure relay is connected with coil one end of described the first relay, the other end of the first normally closed contact of described the first relay is connected with the line of one end of the 3rd open contact of coil one end of described the second relay and described the second relay, the 3rd other end of open contact of described the second relay and the other end of the contact of described middle bit switch are connected, the normally closed contact other end of described the second relay is connected with one end of the coil of rising solenoid directional control valve, the other end of the first open contact and one end of alert lamp of described the second relay are connected, the other end of the second open contact of described the second relay is connected with the line of the open contact with lamp mute button and normally closed contact, the other end of the described normally closed contact with lamp mute button is connected with one end of annunciator, the coil other end of described the first relay, the coil other end of described the second relay, the other end of the coil of described rising solenoid directional control valve, the other end of described alert lamp, describedly with one end of the signal lamp in lamp mute button and the other end of described annunciator, be connected and be connected with a utmost point of power supply.
In technique scheme, more specifically scheme can also be: described annunciator is buzzer phone, any in electric bell.
Owing to having adopted technique scheme, the utility model compared with prior art, the beneficial effect having is: this utility model utilizes pressure relay to detect the pressure of oil circuit in crane hoisting hydraulic tubing, utilize the on-off signal of pressure relay output to control the solenoid directional control valve in riser circuit, once the appearance of abnormal pressure in hydraulic tubing, the oil circuit that cuts off immediately riser circuit, stops the operation of rising; Utilize the on-off signal of pressure relay to drive indicator lamp buzzer phone to send sound and light alarm, principle is simple simultaneously, and circuit is clear, is easy to maintenance, and with low cost, performance safety is reliable.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Overload restriction warning device shown in Fig. 1, it is by pressure relay PS, the first relay K 1, the second relay K 2, operating handle meta switch S B1, rising solenoid directional control valve PV, overload warning indicator lamp H, overload warning buzzer phone HA, from lock strap lamp sound elimination botton switch SB2, form.
The in the situation that of normal work, hoist the pressure of oil circuit in hydraulic tubing below predefined force value, the normally closed contact of pressure relay PS is failure to actuate, the normally closed contact of PS keeps conducting, the coil energized action of the first relay K 1, the normally closed contact of the first relay K 1 disconnects, the state of the second relay K 2 in dead electricity, the normally closed contact of the second relay K 2 and the first open contact and the second open contact keep virgin state constant, rising solenoid directional control valve PV is in "on" position, hoist oil circuit in hydraulic tubing in straightway state, load hook can freely rise, meanwhile, buzzer phone HA and indicator lamp H, in power failure state, do not send sound and light alarm.
The in the situation that of overload, the pressure of oil circuit in hydraulic tubing that hoists surpasses predefined force value, pressure relay PS action, and the normally closed contact of PS disconnects, the coil losing electricity of the first relay K 1, its normally closed contact is closed, the coil energized action of the second relay K 2, and its normally closed contact disconnects, solenoid directional control valve PV dead electricity immediately rises, hoisting, oil circuit is in blocking state in hydraulic tubing, and load hook stops rising, and plays overload protection effect; Meanwhile, the first and second open contacts of the second relay K 2 are closed, and buzzer phone HA and indicator lamp H, in "on" position, send sound and light alarm.When buzzer phone HA sounds warning, can press from lock strap lamp mute button SB2 and carry out noise reduction, the indicator lamp simultaneously carrying in SB2 is bright, the state of indication in noise reduction.(operating handle is when meta in meta switch S B1 contact on operating handle, SB1 disconnects, as long as it is just closed to leave meta) now in closed position, the 3rd open contact of the second relay K 2 is also in closure state, the series arm being comprised of the 3rd open contact of handle meta switch S B1 and the second relay K 2 makes the coil electricity of the second relay K 2 all the time, overload when being unlikely to pressure because of oil circuit in the pipeline that hoists and just having hoisted, while steadily rising, reduce and close when disconnected during the normally closed contact of build-up of pressure relay PS, power-off while switching on during the coil of the second relay K 2, when disconnected during the contact switch of K2, close, and then power-off while switching on while causing rising solenoid directional control valve PV, blocking-up when unimpeded while hoisting oil circuit in pipeline, weight produces " trembling " phenomenon when rising overload.After generation overload can not be risen in the process that hoists, can only operate the handle that hoists to contrary descent direction, realize hoist rope and decline.
Claims (2)
1. an overload restriction warning device, is characterized in that: include the first relay (K1) and the second relay (K2), be arranged on the pressure relay (PS) in hydraulic circuit, be arranged on the middle bit switch (SB1) on operating handle; One end of the normally closed contact of described pressure relay (PS), one end of the normally closed contact of described middle bit switch (SB1), the first and second open contacts of one end of the first normally closed contact of the first relay (K1) and the second relay (K2) and each one end of normally closed contact are connected and are connected with a utmost point of power supply; the other end of the normally closed contact of described pressure relay (PS) is connected with coil one end of described the first relay (K1), the other end of the first normally closed contact of described the first relay (K1) is connected with the line of one end of the 3rd open contact of described the second relay (K2) with coil one end of described the second relay (K2), the other end of the 3rd open contact of described the second relay (K2) is connected with the other end of the normally closed contact of described middle bit switch (SB1), the normally closed contact other end of described the second relay (K2) is connected with one end of the coil of rising solenoid directional control valve (PV), the other end of the first open contact of described the second relay (K2) is connected with one end of alert lamp (H), the other end of the second open contact of described the second relay (K2) is connected with the open contact of band lamp mute button (SB2) and the line of normally closed contact, the other end of the normally closed contact of described band lamp mute button (SB2) is connected with one end of annunciator (HA), the coil other end of described the first relay (K1), the coil other end of described the second relay (K2), the other end of the coil of described rising solenoid directional control valve (PV), the other end of described alert lamp (H), the other end of one end of the signal lamp in described band lamp mute button (SB2) and described annunciator (HA) is connected and is connected with another utmost point of power supply.
2. overload restriction warning device according to claim 1, is characterized in that: described annunciator (HA) is buzzer phone, any in electric bell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420210727.8U CN203845706U (en) | 2014-04-28 | 2014-04-28 | Overload limiting and alarming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420210727.8U CN203845706U (en) | 2014-04-28 | 2014-04-28 | Overload limiting and alarming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203845706U true CN203845706U (en) | 2014-09-24 |
Family
ID=51558747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420210727.8U Withdrawn - After Issue CN203845706U (en) | 2014-04-28 | 2014-04-28 | Overload limiting and alarming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203845706U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649150A (en) * | 2014-04-28 | 2015-05-27 | 中船华南船舶机械有限公司 | Overload limit alarming device |
| CN112678026A (en) * | 2021-01-06 | 2021-04-20 | 中车唐山机车车辆有限公司 | Vehicle alarm bell control circuit, cab vehicle and passenger car |
-
2014
- 2014-04-28 CN CN201420210727.8U patent/CN203845706U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649150A (en) * | 2014-04-28 | 2015-05-27 | 中船华南船舶机械有限公司 | Overload limit alarming device |
| CN112678026A (en) * | 2021-01-06 | 2021-04-20 | 中车唐山机车车辆有限公司 | Vehicle alarm bell control circuit, cab vehicle and passenger car |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140924 Effective date of abandoning: 20160914 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |