CN106325319B - Safety protection system of downward belt conveyor - Google Patents
Safety protection system of downward belt conveyor Download PDFInfo
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- CN106325319B CN106325319B CN201610940062.XA CN201610940062A CN106325319B CN 106325319 B CN106325319 B CN 106325319B CN 201610940062 A CN201610940062 A CN 201610940062A CN 106325319 B CN106325319 B CN 106325319B
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- relay
- speed
- safety
- normally open
- speed switch
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
- G05D13/62—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover characterised by the use of electric means, e.g. use of a tachometric dynamo, use of a transducer converting an electric value into a displacement
Abstract
The invention provides a safety protection system of a downward belt conveyor, which comprises a speed switch, a relay safety relay and a direct current power supply, wherein a monitoring device of the speed switch detects the belt speed of the conveyor, when the belt speed is greater than a preset speed threshold value, a normally closed contact of the speed switch is controlled to be opened, then a signal input loop formed by the direct current power supply, the normally closed contact of the speed switch and a coil of the relay is disconnected, the coil of the relay is powered off, a normally open contact of the relay is disconnected, and a normally open contact channel of the safety relay is disconnected, so that an auxiliary contact loop of a contactor of a brake pump motor is disconnected, the brake pump motor stops working, a steering valve loop is disconnected, a reversing valve is switched to one path of an overflow valve and a speed regulating valve to return oil, the brake action is realized, and the. Namely, after the power failure of the downward belt conveyor occurs, the speed switch detects that the belt speed is too high and sends a signal to the hydraulic braking system, so that the brake is realized, and the phenomenon of galloping is avoided.
Description
Technical Field
The invention relates to the technical field of belt conveyors, in particular to a safety protection system of a downward belt conveyor.
Background
The belt conveyor is one of the most powerful conveying devices in the present day, is the most widely applied device in the category of the whole conveyor, and is widely applied to industries such as metallurgy, mines, cement, wharfs, chemical engineering, grains and the like. The belt conveyor is divided into an upward conveying mode and a downward conveying mode according to the conveying direction of conveyed materials. In the past, the upper belt conveyor is applied more frequently because of higher safety. With the application and development of the belt conveyor in the field of bulk material transportation systems, a lower transportation mode is often difficult to avoid in the design of a long-distance and large-transportation-capacity transportation system, and the lower transportation belt conveyor can transmit power to a power grid during power generation operation, so that the belt conveyor has great economic benefit. However, after the power failure of the downward belt conveyor occurs, the downward acceleration of the downward belt conveyor occurs due to the large mechanical energy of the materials, so that the phenomenon of galloping occurs.
Disclosure of Invention
In view of this, the present invention provides a safety protection system for a downward belt conveyor, which is intended to solve the technical problem that the downward acceleration occurs due to the large mechanical energy of the material when the downward belt conveyor fails in the power-off state.
In order to solve the above technical problems, the proposed solution is as follows:
a safety protection system for a lower belt conveyor, comprising: speed switch, relay, safety relay and DC power supply, wherein,
the direct-current power supply, the normally closed contact of the speed switch and the coil of the relay are connected in series to form a signal input loop;
the input channel of the safety relay is connected with a normally open contact of the relay, the direct-current power supply input channel of the safety relay is connected with the direct-current power supply, and the normally open contact channel of the safety relay is respectively connected in series with a steering valve loop of a brake hydraulic system of the lower conveying belt conveyor and an auxiliary contact loop of a brake pump motor contactor;
and the monitoring device of the speed switch monitors the belt speed of the downward belt conveyor, and when the belt speed is greater than a preset speed threshold value, the normally closed contact is controlled to be opened.
Preferably, the speed switch is: magnetic speed switch.
Preferably, the magnetic speed switch is: ESRW magnetic speed switch.
Preferably, the safety relay comprises two of the input channels.
Preferably, the connection of the input channel of the safety relay and the normally open contact of the relay is specifically as follows: one input channel of the safety relay is connected with a first normally open contact of the relay, and the other input channel of the safety relay is connected with a second normally open contact of the relay.
Preferably, said safety relay comprises one said input channel.
Preferably, the connection of the input channel of the safety relay and the normally open contact of the relay is specifically as follows: the input channel of the safety relay is connected with a first normally open contact of the relay.
Preferably, the direct current power supply is 24V.
Preferably, the system further comprises: and the switch is connected with the normally closed contact in parallel.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the safety protection system of the belt conveyor of the downward transport that above-mentioned technical scheme provided, including speed switch, relay safety relay and DC power supply, wherein, speed switch's monitoring devices detects the belt speed of conveyer, when belt speed is greater than predetermined speed threshold value, control speed switch's normally closed contact is opened, and then DC power supply, the normally closed contact of speed switch and the disconnection of the signal input circuit that the coil of relay is constituteed, the coil outage of relay, the normally open contact disconnection of relay, safety relay's normally open contact passageway disconnection, therefore, the auxiliary contact circuit disconnection of brake pump motor contactor, the brake pump motor stops working, the switching-over valve circuit disconnection, the switching-over valve trades overflow valve and governing valve return oil all the way, and then realize the band-type brake action, the belt stops moving. Namely, after the power failure of the downward belt conveyor occurs, the speed switch detects that the belt speed is too high and sends a signal to the hydraulic braking system, so that the brake is realized, and the phenomenon of galloping is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a safety protection system of a downward belt conveyor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a safety protection system of another lower belt conveyor according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an operation principle of a speed switch according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment provides a safety protection system of a lower belt conveyor, and referring to fig. 1, a structural schematic diagram of the safety protection system is shown, and the safety protection system comprises: a speed switch, a relay, a safety relay and a direct current power supply U, wherein,
the direct-current power supply U, the normally closed contact 11 of the speed switch and the coil K1 of the relay are connected in series to form a signal input loop;
the input channel of the safety relay is connected with a normally open contact K2 of the relay, the direct-current power supply input channel of the safety relay is connected with the direct-current power supply U, and the normally open contact channel of the safety relay is respectively connected in series with a steering valve loop of a brake hydraulic system of the downward belt conveyor and an auxiliary contact loop of a brake pump motor contactor;
the monitoring device 12 of the speed switch monitors the belt speed of the downward belt conveyor, and when the belt speed is greater than a preset speed threshold value, the normally closed contact 11 is controlled to be opened.
Referring to fig. 1, a dc power input channel of the safety relay is composed of a connection terminal a1 and a connection terminal a2, and is connected to a dc power U, specifically, the dc power U is 24V. The safety relay comprises an input channel, wherein the input channel is composed of a connecting terminal S11 and a connecting terminal S12, and an input signal is connected between S11 and S12, namely the normally open contact K2 of the relay is connected. The manual reset channel of the safety relay is composed of wiring terminals S34 and S12, and a reset button L1 is connected between S34 and S12. The normally open contact channel of the safety relay is composed of a wiring terminal 13 and a wiring terminal 14, the wiring terminal 13 and the wiring terminal 14 are connected in series with a steering valve loop of a brake hydraulic system and are also connected in series with an auxiliary contact loop of a brake pump motor contactor, and the on-off of the two loops is controlled simultaneously, so that the brake is realized, and the phenomenon of runaway is avoided.
The safety protection system of the downward belt conveyor that this embodiment provided, speed switch's monitoring devices 12 detects the belt speed of conveyer, when belt speed is greater than preset speed threshold, control speed switch's normally closed contact 11 and open, and then direct current power supply U, the signal input circuit disconnection that normally closed contact 11 of speed switch and coil K1 of relay constitute, the coil K1 outage of relay, the normally open contact K2 disconnection of relay, safety relay's normally open contact passageway disconnection, therefore, the auxiliary contact circuit disconnection of brake pump motor contactor, the brake pump motor stops working, the switching-over valve circuit disconnection, the switching-over valve is changed overflow valve and the speed governing valve oil all the way, and then realize the band-type brake action, the belt stops moving. Namely, after the power failure of the downward belt conveyor occurs, the speed switch detects that the belt speed is too high and sends a signal to the hydraulic braking system, so that the brake is realized, and the phenomenon of galloping is avoided.
Example two
The present embodiment provides another safety protection system for a downward belt conveyor, and referring to fig. 2, a schematic structural diagram of the system is shown, wherein the safety relay is a dual-channel safety relay, that is, the safety relay includes two input channels, one of the input channels is composed of a terminal S11 and a terminal S12, and a normally open contact K2 of a relay is connected between S11 and S12; the other input channel is composed of a connecting terminal S21 and a connecting terminal S22, and a normally open contact K3 of the relay is connected between S21 and S22; the normally open contact channels of the safety relay also comprise two normally open contact channels, one normally open contact channel is composed of a connecting terminal 13 and a connecting terminal 14, and the connecting terminal 13 and the connecting terminal 14 are connected in series with a steering valve loop of a brake hydraulic system; the other normally open contact channel is composed of a connecting terminal 33 and a connecting terminal 34, and the connecting terminal 33 and the connecting terminal 34 are connected in series with an auxiliary contact loop of the brake pump motor contactor. Through the action of two normally open contacts (K2 and K3) of the relay, the on-off of two loops is controlled simultaneously, the brake is realized, and the phenomenon of galloping is avoided.
The speed switch may be a magnetic type speed switch, and as shown in fig. 3, a contact wheel 51 of the magnetic type contact switch is in contact with a belt 61 of the lower belt conveyor. When the belt 61 moves, the contact wheel 51 rotates, and then the extension shaft 52 connected with the contact wheel 51 rotates, and when the rotating speed of the extension shaft 52 is larger than a preset value, the normally closed contact 11 is opened; when the rotation speed of the extension shaft 52 is not more than a preset value, the normally closed contact 11 is in a closed state. The specific magnetic speed switch is an ESRW type magnetic speed switch.
In order to prevent the speed switch 1 from being stopped by mistake due to inaccurate speed measurement, a switch connected in parallel with the normally closed contact 11 of the speed switch 1 can be further arranged and used for shielding the speed switch 1 when the speed switch 1 breaks down.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A safety protection system for a lower belt conveyor, comprising: speed switch, relay, safety relay and DC power supply, wherein,
the direct-current power supply, the normally closed contact of the speed switch and the coil of the relay are connected in series to form a signal input loop;
the input channel of the safety relay is connected with a normally open contact of the relay, the direct-current power supply input channel of the safety relay is connected with the direct-current power supply, and the normally open contact channel of the safety relay is respectively connected in series with a steering valve loop of a brake hydraulic system of the lower conveying belt conveyor and an auxiliary contact loop of a brake pump motor contactor;
the monitoring device of the speed switch monitors the belt speed of the downward belt conveyor, and when the belt speed is greater than a preset speed threshold value, the normally closed contact is controlled to be opened;
the speed switch is as follows: ESRW magnetic speed switch.
2. The system of claim 1, wherein the safety relay comprises two of the input channels.
3. The system according to claim 2, wherein the input channel of the safety relay is connected with the normally open contact of the relay by: one input channel of the safety relay is connected with a first normally open contact of the relay, and the other input channel of the safety relay is connected with a second normally open contact of the relay.
4. The system of claim 1, wherein said safety relay includes one of said input channels.
5. The system according to claim 4, wherein the connection of the input channel of the safety relay and the normally open contact of the relay is specifically as follows: the input channel of the safety relay is connected with a first normally open contact of the relay.
6. The system of claim 1, wherein the dc power source is 24V.
7. The system of claim 1, further comprising: and the switch is connected with the normally closed contact in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610940062.XA CN106325319B (en) | 2016-10-25 | 2016-10-25 | Safety protection system of downward belt conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610940062.XA CN106325319B (en) | 2016-10-25 | 2016-10-25 | Safety protection system of downward belt conveyor |
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| CN106325319A CN106325319A (en) | 2017-01-11 |
| CN106325319B true CN106325319B (en) | 2020-02-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038257A (en) * | 1988-05-31 | 1989-12-27 | 牡丹江市环境科学研究所 | Small Sewage Treatment Equipment and technology thereof |
| CN201746079U (en) * | 2010-08-20 | 2011-02-16 | 芜湖思博机电设备有限公司 | Drive mechanism protection device |
| CN104590823A (en) * | 2014-11-27 | 2015-05-06 | 中国矿业大学 | Disc -shaped braking system for downwards transportation belt type conveyor |
| CN105947596A (en) * | 2016-06-20 | 2016-09-21 | 西安科技大学 | Anti-runaway protection system and method for downward belt conveyor |
-
2016
- 2016-10-25 CN CN201610940062.XA patent/CN106325319B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038257A (en) * | 1988-05-31 | 1989-12-27 | 牡丹江市环境科学研究所 | Small Sewage Treatment Equipment and technology thereof |
| CN201746079U (en) * | 2010-08-20 | 2011-02-16 | 芜湖思博机电设备有限公司 | Drive mechanism protection device |
| CN104590823A (en) * | 2014-11-27 | 2015-05-06 | 中国矿业大学 | Disc -shaped braking system for downwards transportation belt type conveyor |
| CN105947596A (en) * | 2016-06-20 | 2016-09-21 | 西安科技大学 | Anti-runaway protection system and method for downward belt conveyor |
Non-Patent Citations (2)
| Title |
|---|
| 基于安全继电器的悬臂式掘进机安全控制系统;刘国鹏;《装备制造技术》;20141031(第10期);第2.2节，第3节，及图2-3 * |
| 带式输送机驱动技术及电控系统的变频改造;钱伟;《煤矿机电》;20100630(第6期);全文 * |
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