Alarm bell control circuit and control method of anti-explosion elevator

Abstract

The invention discloses an alarm bell control circuit and a control method of an explosion-proof elevator, the alarm bell control circuit comprises an alarm bell button, a Zener safety barrier, a relay, an emergency power supply and an explosion-proof alarm bell, the Zener safety barrier, the relay and the emergency power supply are installed in an explosion-proof cabinet; the alarm bell button penetrates into the explosion-proof cabinet through a first cable and a second cable to be connected with the first wiring terminal and the second wiring terminal of the Zener safety barrier to form a loop, a control coil of the relay is connected between the fourth wiring terminal of the Zener safety barrier and the positive electrode end of the emergency power supply, and the negative electrode end of the emergency power supply is connected with the fifth wiring terminal and the second wiring terminal of the Zener safety barrier. The positive electrode end of the explosion-proof alarm bell penetrates into the explosion-proof cabinet through a third cable and is connected between the control coil of the relay and the positive electrode end of the emergency power supply through a normally open contact of the relay, and the negative electrode end of the explosion-proof alarm bell penetrates into the explosion-proof cabinet through a fourth cable and is connected with the negative electrode end of the emergency power supply. According to the invention, the explosion-proof requirement can be met while the emergency alarm bell alarm function is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator safety, and in particular to an alarm control circuit and a control method for an explosion-proof elevator. Background Art

[0002] GB / T 7588.1-2020 5.12.3.2 stipulates that if the elevator travel is greater than 30m or there is no direct communication between the car and the emergency operation location, an intercom system or similar device powered by an emergency power supply as described in 5.4.10.4 should be installed in the car and the emergency operation location. In general, the emergency alarm device and intercom system configured in the elevator include an intercom phone and an alarm bell.

[0003] Explosion-proof elevators are widely used in explosion-proof elevators. They can be used in explosive environments and will not cause combustion or explosion in the surrounding explosive environment during normal use. The definition in the standard GB 31094-2014 "Safety Specifications for the Manufacture and Installation of Explosion-proof Elevators" is an elevator composed of several electrical and non-electrical components, designed, manufactured and installed according to the specified conditions, and will not cause combustion or explosion in the surrounding explosive environment. Table 10 of GB 31094-2014 requires that the alarm device or telephone of the explosion-proof elevator must comply with the explosion-proof certificate. H5.4.3.1 of TSG 7007-2022 "Elevator Type Test Rules" requires that the alarm bell must have an explosion-proof certificate. Summary of the invention

[0004] The object of the present invention is to provide an alarm control circuit and a control method for an explosion-proof elevator, which can realize the emergency alarm function and meet the explosion-proof requirements at the same time.

[0005] The technical solution of the present invention is as follows:

[0006] An alarm control circuit for an explosion-proof elevator comprises an alarm button, a Zener safety barrier, a relay, an emergency power supply and an explosion-proof alarm. The Zener safety barrier, the relay and the emergency power supply are installed inside a flameproof cabinet. The alarm button is respectively inserted into the flameproof cabinet through a first cable and a second cable to be connected to terminals 1 and 2 of the Zener safety barrier to form a loop. The control coil of the relay is connected between the terminal 4 of the Zener safety barrier and the positive terminal of the emergency power supply. The negative terminal of the emergency power supply is connected to the terminals 5 and 2 of the Zener safety barrier. The positive terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a third cable and connected between the control coil of the relay and the positive terminal of the emergency power supply through the normally open contact of the relay. The negative terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a fourth cable and connected to the negative terminal of the emergency power supply.

[0007] Furthermore, a first cable stuffing box is installed on the explosion-proof cabinet at the insertion position corresponding to the first cable, the interior of the first cable stuffing box is filled with rubber, and both ends of the first cable stuffing box are tightened by nuts. A second cable stuffing box is installed on the explosion-proof cabinet at the insertion position corresponding to the second cable, the interior of the second cable stuffing box is filled with rubber, and both ends of the second cable stuffing box are tightened by nuts.

[0008] Furthermore, a third cable stuffing box is installed on the explosion-proof cabinet at the insertion position corresponding to the third cable, the interior of the third cable stuffing box is filled with rubber, and both ends of the third cable stuffing box are tightened by nuts. A fourth cable stuffing box is installed on the explosion-proof cabinet at the insertion position corresponding to the fourth cable, the interior of the fourth cable stuffing box is filled with rubber, and both ends of the fourth cable stuffing box are tightened by nuts.

[0009] Control method of the alarm control circuit of the above explosion-proof elevator:

[0010] When the alarm button is pressed, the control coil of the relay is energized, the normally open contact is closed, the control circuit of the explosion-proof alarm is energized, and the explosion-proof alarm works;

[0011] When the alarm button is released, the control coil of the relay is de-energized, the normally open contact is disconnected, the control circuit of the explosion-proof alarm is de-energized, and the explosion-proof alarm does not work.

[0012] Compared with the prior art, the beneficial effect of the present invention is that the present invention includes an alarm button, a Zener safety barrier, a relay, an emergency power supply and an explosion-proof alarm, wherein the Zener safety barrier, the relay and the emergency power supply are installed inside a flameproof cabinet, the alarm button is respectively inserted into the flameproof cabinet through a first cable and a second cable to be connected to the 1 and 2 terminal blocks of the Zener safety barrier to form a loop, the control coil of the relay is connected between the 4 terminal block of the Zener safety barrier and the positive terminal of the emergency power supply, the negative terminal of the emergency power supply is connected to the 5 terminal block and the 2 terminal block of the Zener safety barrier, the positive terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a third cable and is connected between the control coil of the relay and the positive terminal of the emergency power supply through the normally open contact of the relay, the negative terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a fourth cable and is connected to the negative terminal of the emergency power supply, and cable stuffing boxes are installed on the flameproof cabinet corresponding to the insertion positions of the first cable, the second cable, the third cable and the fourth cable, and the cables pass through the cable stuffing boxes and are sealed and flameproofed. Since the rated voltage of currently commonly used explosion-proof alarm bells is DC24V and the rated current is generally not less than 500mA, the present invention can realize the alarm function of the emergency alarm bell while meeting the explosion-proof requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 Schematic diagram of the circuit of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0017] Example

[0018] See also Figure 1 The present embodiment provides an alarm control circuit for an explosion-proof elevator, comprising an alarm button S1, a Zener safety barrier, a relay K1, an emergency power supply and an explosion-proof alarm B1. The Zener safety barrier, the relay K1 and the emergency power supply are installed inside a flameproof cabinet. The alarm button S1 penetrates into the flameproof cabinet through a first cable and a second cable respectively and is connected to terminals 1 and 2 of the Zener safety barrier to form a loop. The control coil of the relay K1 is connected between the terminal 4 of the Zener safety barrier and the positive terminal of the emergency power supply. The negative terminal of the emergency power supply is connected to the terminals 5 and 2 of the Zener safety barrier. The positive terminal of the explosion-proof alarm B1 penetrates into the flameproof cabinet through a third cable and is connected between the control coil of the relay K1 and the positive terminal of the emergency power supply through the normally open contact of the relay K1. The negative terminal of the explosion-proof alarm B1 penetrates into the flameproof cabinet through a fourth cable and is connected to the negative terminal of the emergency power supply. Since the load capacity of the Zener safety barrier is 93mA, it cannot meet the working current requirement of the explosion-proof alarm B1. In order to drive the explosion-proof alarm B1 to work normally, the Zener safety barrier is used to control the coil terminals 13 and 14 of the relay K1, and the normally open contacts 8 and 12 of the relay K1 control the power supply of the explosion-proof alarm B1.

[0019] Furthermore, the flameproof cabinet is provided with a first cable stuffing box corresponding to the insertion position of the first cable, the interior of the first cable stuffing box is filled with rubber, and the two ends of the first cable stuffing box are tightened by nuts; the flameproof cabinet is provided with a second cable stuffing box corresponding to the insertion position of the second cable, the interior of the second cable stuffing box is filled with rubber, and the two ends of the second cable stuffing box are tightened by nuts; the flameproof cabinet is provided with a third cable stuffing box corresponding to the insertion position of the third cable, the interior of the third cable stuffing box is filled with rubber, and the two ends of the third cable stuffing box are tightened by nuts; the flameproof cabinet is provided with a fourth cable stuffing box corresponding to the insertion position of the fourth cable, the interior of the fourth cable stuffing box is filled with rubber, and the two ends of the fourth cable stuffing box are tightened by nuts. Thus, a sealed flameproof treatment is achieved. The alarm control circuit of the explosion-proof elevator can realize the emergency alarm alarm function while meeting the explosion-proof requirements.

[0020] Control method of the alarm control circuit of the above explosion-proof elevator:

[0021] When the alarm button is pressed, the control coil of the relay is energized, the normally open contact is closed, the control circuit of the explosion-proof alarm is energized, and the explosion-proof alarm works;

[0022] When the alarm button is released, the control coil of the relay is de-energized, the normally open contact is disconnected, the control circuit of the explosion-proof alarm is de-energized, and the explosion-proof alarm does not work.

[0023] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof elevator alarm control circuit, Features: It includes an alarm button, a Zener safety barrier, a relay, an emergency power supply and an explosion-proof alarm. The Zener safety barrier, the relay and the emergency power supply are installed inside a flameproof cabinet. The alarm button is respectively inserted into the flameproof cabinet through a first cable and a second cable to be connected to terminals 1 and 2 of the Zener safety barrier to form a loop. The control coil of the relay is connected between the terminal 4 of the Zener safety barrier and the positive terminal of the emergency power supply. The negative terminal of the emergency power supply is connected to the terminals 5 and 2 of the Zener safety barrier. The positive terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a third cable and is connected between the control coil of the relay and the positive terminal of the emergency power supply through the normally open contact of the relay. The negative terminal of the explosion-proof alarm is inserted into the flameproof cabinet through a fourth cable and connected to the negative terminal of the emergency power supply.

2. The alarm control circuit of an explosion-proof elevator according to claim 1, Features: A first cable stuffing box is installed on the explosion-proof cabinet corresponding to the insertion position of the first cable, the interior of the first cable stuffing box is filled with rubber, and the two ends of the first cable stuffing box are tightened by nuts. A second cable stuffing box is installed on the explosion-proof cabinet corresponding to the insertion position of the second cable, the interior of the second cable stuffing box is filled with rubber, and the two ends of the second cable stuffing box are tightened by nuts.

3. The alarm control circuit of an explosion-proof elevator according to claim 1, Features: A third cable stuffing box is installed on the explosion-proof cabinet corresponding to the insertion position of the third cable, the interior of the third cable stuffing box is filled with rubber, and both ends of the third cable stuffing box are tightened by nuts. A fourth cable stuffing box is installed on the explosion-proof cabinet corresponding to the insertion position of the fourth cable, the interior of the fourth cable stuffing box is filled with rubber, and both ends of the fourth cable stuffing box are tightened by nuts.

4. A method for controlling an explosion-proof elevator alarm control circuit according to any one of claims 1 to 3, Features: When the alarm button is pressed, the control coil of the relay is energized, the normally open contact is closed, the control circuit of the explosion-proof alarm is energized, and the explosion-proof alarm works; When the alarm button is released, the control coil of the relay is de-energized, the normally open contact is disconnected, the control circuit of the explosion-proof alarm is de-energized, and the explosion-proof alarm does not work.

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