KR101797552B1 - Electronic cam limit switch - Google Patents

Abstract

The present invention relates to an electronic cam limit switch. In particular, the electronic cam limit switch is installed in a rotary movement device for heavy hoisting such as a hoist or an automation crane and a bogie, so that a hoisting position can be precisely controlled as well as replacement work for maintenance is easy. In addition, the electronic cam limit switch is separately installed from a driving source of the rotary movement device for heavy hoisting such as a hoist so that the electronic cam limit switch can be relatively less constrained to an installation position. Since a preset function is provided in the electronic cam limit switch, an origin point can be easily, and malfunctions can be prevented by using a dust accumulation prevention function. Furthermore, an electronic cam controller is used together to be operated for position control of automation cranes and bogies.

Description

An electronic cam limit switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic cam limit switch, and more particularly, to an electronic cam limit switch, which is installed in a rotary movement device for moving a heavy object such as a hoist or an automation crane, It is installed separately from the drive source in the same direction as the drive source of the heavy goods hoisting rotary movement device such as a hoist so that it can receive a comparatively less restriction on the installation position. It is easy to set the origin by preset function and has dust accumulation prevention function. And to an electronic cam limit switch for use with an electronic cam controller to be suitable for position control of an automated crane and a bogie.

BACKGROUND OF THE INVENTION [0002] In industry, many devices for performing necessary work using rotational power transmitted from a main power source such as a hoist, a crane, and a truck are used.

Particularly, in an automated machine, a main driving part (i.e., a rotating body) for generating power and a complicated mechanical device connected to the main driving part are used. In order to control the transmission and / It uses a mechanical cam (cam).

Such a cam is coupled to a rotary shaft connected to the rotating body so that the moving state and the operating time of the mechanism which is in contact with the cam in accordance with the shape of the cam are controlled.

However, gears for driving cams, which are conventionally used, are not used for precise mechanical control due to their inherent characteristics.

The cam gear is provided with a cam switch having a mechanical structure and is designed to detect the position of the rotating body according to the number of teeth of the gear through the cam switch.

However, the conventional cam switch has a problem in that it is limited in application because it is difficult to secure a sufficient installation space when applied to an automated apparatus having a complicated structure because of its large volume and heavy weight as a cast structure.

Further, since the conventional cam switch has a mechanical structure, mechanical corrosion is likely to occur, and when the cam switch is used for a long period of time, an operational error may be caused.

In order to solve this problem, a conventional electronic cam switch including the above-mentioned registered patent has been disclosed. However, since these are integrally provided coaxially with the drive motor together with the electronic cam controller, maintenance of the drive motor becomes difficult, There is still a lot of inconvenience in terms of mechanism rather than the control side because it is often limited by the installation space due to the installation on the opposite side.

In addition, since the environment in which the electronic cam controller with the electronic cam switch is installed and operated is very dusty, no mechanical means for solving the danger of malfunction caused by dust are disclosed.

Korea Patent Registration No. 10-1296831 (August 31, 2013) 'Hoist device equipped with an electronic cam switch'

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a rotary movement device for lifting heavy objects such as a hoist or an automation crane, It is easy to replace for maintenance and it is installed separately from the driving source in the same direction as the driving source of the hoisting and moving hoist such as a hoist so as to be less constrained to the installation position. And is provided with an electronic cam limit switch used with an electronic cam controller to prevent erroneous operation due to dust accumulation prevention function and to be suitable for an automatic crane and position control of a bogie type.

The present invention provides a means for achieving the above object by spacing apart from a drum motor (DM) installed in a hoist or crane mounting base (100) for rotating and driving a winding drum (DR) A control box 200 installed in parallel; And a box cover 210 for sealing the opened upper surface of the control box 200. The control box 200 includes a control panel 230 as a controller and a control panel 230 for detecting signals A connector 250 for electrically connecting the control panel 230 and the detection sensor 240 so as to be capable of signal processing and a connector 250 which is installed parallel to the winding drum DR and spaced apart from the winding drum DR, Is connected to an auxiliary roll axis (RT) provided on an auxiliary roll (SR) rotating at the same speed as the take-up drum (DR) when the roll (W) is unwound or wound so that the detection sensor A shaft 260 is provided; The control panel 230 includes an MCU (Main Control Unit) 231 mounted in a board form and performing a main control function, a keypad type setting unit 232 connected to the MCU 231 to set a set value, And a current position of the wire wound on the wire W is calculated by calculating the wire length of the wire W connected to the MCU 231 and based on the detection value transmitted from the detection sensor 240, A comparator 233 for determining whether the position of the drum motor DM has exceeded a predetermined upper limit value and for stopping the power supply to the motor controller DM when the power exceeds the set upper limit value, A memory unit 234 driven in accordance with a control signal of the MCU 231 and storing a set value and a detection value of the detection sensor 240 for comparison reading, Receives GPS information from the control panel (212) Identifying information and to store in the memory unit 234. In the electronic cam limit switch built into the sensor (240) constituting the electronic cam controller with a GPS module 236 is controlled by the MCU (231);
A circular plate 320 having a plurality of holes at predetermined intervals in the circumferential direction is rotatably fixed to the detection shaft 260 inside the detection sensor 240; An infrared diode 300 electrically connected to the MCU 231 is provided on one side of the circular plate 320 through a connector 250 and an infrared diode 300 electrically connected to the MCU 231 through a connector 250 A phototransistor 310 connected to the phototransistor 310;
An air pump 270 driven by a control signal of the MCU 231 is installed in the control box 200. A protrusion insertion part 202 is formed along the circumference of the upper surface of the control box 200, And the air pump 270 is connected to the protrusion inserting portion 202 through the air supply passage 204 to supply air. The bottom of the box cover 210 has a circumference A plurality of cover flow passages 214 are formed in the box cover 210 and the cover flow passages 214 are formed in the concave grooves 212. [ A plurality of injection nozzles 216 are provided on the surface of the box cover 210 and the injection nozzles 216 are communicated with the cover passage 214;
A protective coating layer is formed on the inner and outer surfaces of the control box 200 and the box cover 210. The protective coating layer is formed by spray coating a liquid phase in which 60% by weight of the first heat resistant mixture and 40% ≪ / RTI >
The first heat resistant mixture contained 4.5 wt% Pozzolan, 14 wt% glass fiber having a length of 2-3 cm, 4.5 wt% monoglyceride, 2,2-Dibromo-3-nitrilopropionamide 8.5 6.5% by weight Insuladd powder, 5.5% by weight DOTP (Dioctyl terephthalate) and the remaining PVC sol (PVC Sol);
Wherein the second heat resistant mixture comprises 80 wt% of a PVC sol and 20 wt% of an additive, wherein the additive comprises 8 parts by weight of expanded graphite, 1.5 parts by weight of aluminum hydroxide, 4 parts by weight of zirconium 4 6 parts by weight of mullite and 10 parts by weight of DOTP;
A hook groove HM is formed on one side surface of the control box 200 so that the hook HK formed on the box cover 210 is coupled to prevent the opening from being easily opened. On the opposite surface, a key A keypad P is installed on the side of the key bundle K and a controller CR is installed on a wall surface of the control box 200. The keypad P is connected to the controller (K) is activated and activated when a key is inserted into the key bundle (K) under the control of the control unit (CR), so that the electronic cam limit switch is exposed on the front surface of the control box (200).

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According to the present invention, it is possible to precisely control the hoist position by installing the hoist or the like on a hoisting rotary device for lifting hoist, etc., and to easily carry out replacement work for maintenance, Since it is separated from the drive source in the same direction as the drive source of the heavy-goods hoisting rotary motion device, it is easy to maintain maintenance work and is installed together with the electronic cam controller, so that the electronic cam controller is prevented from accumulating dust by periodic air purge Thereby preventing malfunction of the electronic cam limit switch and realizing stable operation.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary view showing an example of an installation of an electronic cam controller including an electronic cam limit switch according to the present invention. Fig.
2 is an exemplary photograph showing an internal structure of an electronic cam controller including an electronic cam limit switch according to the present invention.
3 is a block diagram of a control panel constituting an electronic cam controller including an electronic cam limit switch according to the present invention.
4 is an illustration of a GPS antenna and a GPS module installed in an electronic cam controller including an electronic cam limit switch according to the present invention.
5 is an exemplary view showing an air purge structure for dust removal of an electronic cam controller including an electronic cam limit switch according to the present invention.
6 is an exemplary circuit diagram related to the input / output of the electronic cam limit switch according to the present invention.
7 is an exemplary view showing a locking structure of an electronic cam controller including an electronic cam limit switch according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

As shown in FIG. 1, the electronic cam limit switch according to the present invention is installed together with the electronic cam controller, which is a means for controlling the hoist, the crane, First, the electronic cam switch will be described later.

That is, the electronic cam controller including the electronic cam switch according to the present invention includes a control box 200 having an open upper surface, which is detachably fixed on a mounting table 100, (Not shown).

A drum motor DM for driving a winding drum DR is provided on the mounting table 100. The present invention can be applied to a control box 200 constituting an electronic cam limit switch by a drum motor DM And is installed parallel to the side where the drum motor DM is installed.

In order to operate the electronic cam limit switch, an auxiliary roll SR is further provided in parallel to the take-up drum DR in a spaced-apart relation and the auxiliary roll axis RT of the auxiliary roll SR is connected to the control box 200 ).

Thus, when the auxiliary roll SR is rotated by causing the wire W wound or unwound on the winding drum DR to move while being in contact with the surface of the auxiliary roll SR, .

Here, the winding drum DR and the auxiliary roll SR are supported and fixed by a roll block RB.

In this case, a speed reducer (not shown) may be further provided between the auxiliary roll axis RT and the control box 200, and the detection sensor 240, which will be described later, May be installed directly. However, the present invention is limited to the example having the control box 200.

2, the control box 200 includes a control panel 230 as a controller, a detection sensor 240 for transmitting a detection signal to the control panel 230, And a detecting shaft 260 connected to the auxiliary roll axis RT and connected to the detecting sensor 240 to detect the rotational speed of the detecting shaft 240. [ Respectively.

The control panel 230, the detection sensor 240, the connector 250, and the detection axis 260 may be integrated into one control box 200 as shown in FIG. 2 The control panel 230, the detection sensor 240, and the connector 250 may be separately provided, which may vary depending on the installation environment.

However, the present invention is characterized in that it is implemented as an integrated type, and will be described based on this.

In addition, the detection sensor 240 is an encoder, and is connected to an MCU (Main Control Unit) 231 (see FIG. 3) described later.

The controller according to the present invention uses a 24 V direct current power supply. The installation environment should be free of corrosive gas, dust should not accumulate, the output signal should be 1 ms or less, A numerical input method using a keypad is preferable.

3, the control panel 230 includes an MCU (Main Control Unit) 231 that is mounted in a board form and performs a main control function, and a controller 231 that is connected to the MCU 231 to set a setting value And a detection unit 240 connected to the MCU 231 for calculating the length of the wire W to be drawn and drawn on the basis of the detection value transmitted from the detection sensor 240, A comparison operation unit 233 for reading the current position of the water and comparing the read position with the set upper limit value to determine whether the position exceeds the set upper limit value, A memory unit 234 driven according to a control signal of the MCU 231 and storing a set value and a detection value of the detection sensor 240 for comparison reading, 4) from the GPS antenna 212 (see Fig. 4) provided on the cover 210, Receiving and identifying the location of the control panel 230 and to store in the memory unit 234 includes a GPS module 236 is controlled by the MCU (231).

Here, the position information, i.e., the coordinate information calculated by the GPS module 236 is transmitted to a management server (not shown) under the control of the MCU 231 in the event of a failure so that it can be repaired in a short period of time So that a delay in operation is prevented.

This is one of the features of the present invention. Conventionally, even if a failure occurs in the electronic cam limit switch, it is not known which of the electronic cam limit switches that are installed apart from each other in a field, Since it was possible to confirm only after voice communication was performed through wired and wireless, it took a long time to perform the maintenance and maintenance work, which resulted in a delay in operation.

However, in the case of the present invention, for example, the drum motor DM is driven. If the detection sensor 240 can not detect the failure, the MCU 231 immediately determines that the failure has occurred and sends the coordinate signal, By sending, the maintenance team can immediately move to the location and repair it.

In this case, whether or not the drum motor DM is driven can be immediately detected by the MCU 231 controlling the motor control unit 235. [ Therefore, in the present invention, the motor control unit 235 is not mounted to the drum motor DM but mounted inside the control panel 230 having the MCU 231.

5, an air pump 270, which is driven according to a control signal of the MCU 231, is further provided in the control box 200, and an air pump 270 is installed on the upper surface of the control box 200. In addition, The air pump 270 is connected to the protrusion inserting portion 202 through the air supply passage 204 to supply air. The protrusion inserting portion 202 is formed at the center of the width.

The box cover 210 has a concave groove 212 through which the protrusion insertion portion 202 is inserted and a plurality of cover flow passages 214 are formed in the box cover 210, And the cover passage 214 is communicated with the concave groove 212. [

A plurality of injection nozzles 216 are provided on the surface of the box cover 210 so that the injection nozzles 216 communicate with the cover flow passage 214.

Particularly, in order to prevent a part of the dust accumulated on the surface of the box cover 210 from being introduced into the cover flow path 214 due to the installation of the injection nozzle 216, a truncated cone- And the injection nozzle 216 is disposed to be exposed to the outside through the center of the foreign object support 218.

In addition, since a plurality of ejection openings (not shown) are formed radially in the ejection nozzle 216, foreign substances such as dust remaining on the surface of the box cover 210 are blown and removed because the ejection holes are ejected in all directions when the air is ejected.

At this time, the air ejection may be performed periodically according to the control signal of the MCU 231. [

In addition, a protective coating layer is formed on the inner and outer surfaces of the control box 200 and the box cover 210 to have heat resistance, fire resistance and antimicrobial properties. The coating liquid for forming the protective coating layer includes a first heat resistant mixture 60 By weight, and 40% by weight of the second heat resistant mixture.

The first heat-resistant mixture was prepared by mixing 4.5 wt.% Pozzolan, 14 wt.% Glass fiber having a length of 2-3 cm, 4.5 wt.% Monoglyceride, 2,2-Dibromo-3-nitrilopropionamide ), 6.5 wt% Insuladd powder, 5.5 wt% DOTP (Dioctyl terephthalate), and the remaining PVC sol (PVC Sol).

Here, the pozzolan is mainly used as a concrete admixture, but it is an artificial pozzolan. In the present invention, natural pozzolans collected from the volcanic ash and volcanic rocks are used to increase acid resistance, corrosion resistance, durability and waterproof property , And the particle size is preferably 0.1-0.2 mm.

In addition, the glass fiber is added to increase the tensile strength and to improve the adhesion of the protective coating layer, stability stability and suppression of micro cracks.

The monoglyceride is added to enhance the antifouling property by promoting emulsification and inhibiting the adherence of foreign matter to the surface.

DBNPA is a typical liquid antimicrobial agent having excellent antibacterial properties even in an alkaline environment. It is known that DBNPA has excellent antimicrobial properties especially against Staphylococcus, Escherichia coli, Pneumococcus and mite and mold.

In addition, the insulin powder is a microscopic hollow spherical powder having a size of 30 to 100 microns mainly composed of aluminum silicate and forms a ceramic coating of a closed air layer, exhibiting excellent heat radiation and thermal resistance, It is a non-combustible material with a melting point of about 1,800 ° C and has a compressive strength of about 3,000 N / cm 3 because it is an environmentally friendly material with no heavy metal, VOC and toxicity. In the present invention, it is added to enhance flame retardancy.

The DOTP is an eco-friendly PVC plasticizer added to plasticize PVC to increase moldability.

The second heat resistant mixture is composed of 80% by weight of a PVC sol and 20% by weight of an additive. The additives include 8 parts by weight of expanded graphite, 1.5 parts by weight of aluminum hydroxide, 4 parts by weight of zirconium, 6 parts by weight of mullite and 10 parts by weight of DOTP.

Since the Exandable Graphite has a layered structure of graphite, when particles or small molecules are inserted between the layers and heat is applied, the particles are separated like an accordion and expanded by a factor of several hundreds, It enhances flame resistance.

The aluminum hydroxide is added to prevent hydrophobization of the PVC brush and to induce hydrophilization to increase the binding force.

The zirconium is added to increase the fire resistance, the corrosion resistance and the flame retardancy by forming a protective coating made of an oxide or a nitrogen by bonding with oxygen in the air when a fire occurs.

In addition, the mullite is added to increase the melting point to about 1500 ° C to enhance the flame resistance.

In addition, the DOTP is a PVC plasticizer as described above.

Meanwhile, the electronic cam limit switch according to the present invention is built in the detection sensor 240 and is provided in the form of an input / output circuit diagram as shown in FIG.

6, an infrared diode 300 electrically connected to the MCU 231 through a connector 250 is installed at one side with a gap of 4-10 mm, and the infrared diode 300 electrically connected to the other side through a connector 250 A phototransistor 310 electrically connected to the MCU 231 is provided and a circular plate 320 having a plurality of holes formed at a small interval in the circumferential direction can be fixed to the detection axis 260, A transmission type photo-interrupter of the type provided is incorporated in the detection sensor 240.

When the infrared diode 300 is turned on in accordance with the control signal of the MCU 231 and the light emitted from the infrared diode 300 passes through the hole of the circular plate 320, the light is transmitted to the collector of the phototransistor 310 When the current flows, the voltage of the collector falls. When the current does not pass through the hole of the circular plate 320, the collector is not contacted with the phototransistor 310. Therefore, the current of the collector is weak and the voltage of the collector rises. The MCU 231 can control the output waveform of the wire W to calculate the change in length of the wire W. [

Unlike the conventional contact type mechanical structure, such a structure is non-contact type, and the detection speed is very fast.

In addition, in the case of the output terminal, the processing speed is increased as much as 7 points (OUT1, ..., OUT7) for relay and 1 point (OUT8) for status check.

In addition, if the operation speed is slow, the operator may unknowingly open the control box 200 and arbitrarily adjust the set value to speed up the operation.

In this case, since there is a great risk of a safety accident and control instability may occur, it is necessary to configure the control box 200 so as not to open it arbitrarily.

7, a hook groove HM is formed on one side surface of the control box 200 to prevent the hook HK formed on the box cover 210 from being coupled to the box cover 210, On the opposite side, a key bundle (K) for receiving a key is provided.

A controller CR is installed on a wall surface of the control box 200. The keypad P is operated under the control of the controller CR, When the key K is inserted into the bundle K and then opened, the bundle K is energized and activated to be displayed on the other side of the control box 200,

In other words, normally, the keypad P is not seen and hidden, and the keypad P is displayed only when the key bundle K is normally opened by the key, thereby enhancing safety.

At this time, if the key is opened, the door 2300 can not be opened, but the primary door lock is released. Then, the password on the activated keypad P must be exactly matched so that the final secondary lock is released, ) Is opened.

To this end, the controller CR includes a key control unit KC. The key control unit KC includes a key recognition unit ID for detecting whether the key bundle K is properly opened, a key bundle K A keypad unit PD for activating the keypad P in accordance with a control signal of the key control unit KC if the key is rotated and properly operated, a setting unit SL for setting a password of the keypad P, An alarm part AR which sounds an alarm in response to a control signal of the key control part KC if the number of times exceeds a predetermined number of times and a verification part CO which confirms whether or not the password is matched .

If the dual lock structure is provided in this way, the unauthorized person can not open the control box 200 arbitrarily, so that the set value can not be manipulated, and safety can be enhanced.

100: Mounting base 200: Control box
210: box cover 300: infrared diode
310: photo transistor 320: original plate

Claims (1)

A control box 200 provided in parallel with the drum motor DM installed in the installation stand 100 of the hoist or crane to rotate the winding drum DR for winding and unwinding the wire W; And a box cover 210 for sealing the opened upper surface of the control box 200. The control box 200 includes a control panel 230 as a controller and a control panel 230 for detecting signals A connector 250 for electrically connecting the control panel 230 and the detection sensor 240 so as to be capable of signal processing and a connector 250 which is installed parallel to the winding drum DR and spaced apart from the winding drum DR, Is connected to an auxiliary roll axis (RT) provided on an auxiliary roll (SR) rotating at the same speed as the take-up drum (DR) when the roll (W) is unwound or wound so that the detection sensor A shaft 260 is provided; The control panel 230 includes an MCU (Main Control Unit) 231 mounted in a board form and performing a main control function, a keypad type setting unit 232 connected to the MCU 231 to set a set value, And a current position of the wire wound on the wire W is calculated by calculating the wire length of the wire W connected to the MCU 231 and based on the detection value transmitted from the detection sensor 240, A comparator 233 for determining whether the position of the drum motor DM has exceeded a predetermined upper limit value and for stopping the power supply to the motor controller DM when the power exceeds the set upper limit value, A memory unit 234 driven in accordance with a control signal of the MCU 231 and storing a set value and a detection value of the detection sensor 240 for comparison reading, Receives GPS information from the control panel (212) Identifying information and to store in the memory unit 234. In the electronic cam limit switch built into the sensor (240) constituting the electronic cam controller with a GPS module 236 is controlled by the MCU (231);
A circular plate 320 having a plurality of holes at predetermined intervals in the circumferential direction is rotatably fixed to the detection shaft 260 inside the detection sensor 240; An infrared diode 300 electrically connected to the MCU 231 is provided on one side of the circular plate 320 through a connector 250 and an infrared diode 300 electrically connected to the MCU 231 through a connector 250 A phototransistor 310 connected to the phototransistor 310;
An air pump 270 driven by a control signal of the MCU 231 is installed in the control box 200. A protrusion insertion part 202 is formed along the circumference of the upper surface of the control box 200, And the air pump 270 is connected to the protrusion inserting portion 202 through the air supply passage 204 to supply air. The bottom of the box cover 210 has a circumference A plurality of cover flow passages 214 are formed in the box cover 210 and the cover flow passages 214 are formed in the concave grooves 212. [ A plurality of injection nozzles 216 are provided on the surface of the box cover 210 and the injection nozzles 216 are communicated with the cover passage 214;
A protective coating layer is formed on the inner and outer surfaces of the control box 200 and the box cover 210. The protective coating layer is formed by spray coating a liquid phase in which 60% by weight of the first heat resistant mixture and 40% ≪ / RTI >
The first heat resistant mixture contained 4.5 wt% Pozzolan, 14 wt% glass fiber having a length of 2-3 cm, 4.5 wt% monoglyceride, 2,2-Dibromo-3-nitrilopropionamide 8.5 6.5% by weight Insuladd powder, 5.5% by weight DOTP (Dioctyl terephthalate) and the remaining PVC sol (PVC Sol);
Wherein the second heat resistant mixture comprises 80 wt% of a PVC sol and 20 wt% of an additive, wherein the additive comprises 8 parts by weight of expanded graphite, 1.5 parts by weight of aluminum hydroxide, 4 parts by weight of zirconium 4 6 parts by weight of mullite and 10 parts by weight of DOTP;
A hook groove HM is formed on one side surface of the control box 200 so that the hook HK formed on the box cover 210 is coupled to prevent the opening from being easily opened. On the opposite surface, a key A keypad P is installed on the side of the key bundle K and a controller CR is installed on a wall surface of the control box 200. The keypad P is connected to the controller (K) is activated and activated when a key is inserted into the key bundle (K) under the control of the controller (CR), so that the electronic cam limit switch is exposed on the front surface of the control box (200).

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