Scram button and control loop thereof

Abstract

The utility model provides a scram button control loop, which comprises an SIS system, a logic controller and a scram button which are arranged in the SIS system, and at least three groups of contacts arranged on the scram button, wherein one contact of each of the at least three groups of contacts is respectively connected with the logic controller, and the other contact of each of the at least three groups of contacts is jointly or respectively connected with the logic controller. According to the utility model, loop control is carried out by adopting a three-contact mode, and interlocking is not triggered by mistake even if one contact of the scram button fails or is in poor contact, or one group of lines fails or one channel of the control system fails, so that the safety of the SIS system is improved, non-planned stop caused by faults of the scram button and the loop is reduced or even eliminated, and the reliability of the system is improved. And serious risks caused by uncertain factors to production are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency stop buttons, in particular to an emergency stop button and its control circuit. Background Art

[0002] At present, the emergency stop buttons designed for the SIS system (Safety Interlocking System) in the chemical industry are all single-contact normally closed button design schemes, and the triggered emergency stop buttons are all important or key interlocks, and are designed with a normally closed logic.

[0003] According to the Design Code for Safety Instrumentation Systems in Petrochemical Industry GB_T50770 - 2013:

[0004] 10.2.1 Emergency stop buttons, switches, signal alarms, signal lights, etc. shall be installed on the auxiliary operation console of the safety instrumentation system.

[0005] 10.2.5 When emergency stop buttons, switches, signal alarms, etc. are connected to the safety instrumentation system, hard wiring shall be used, and communication methods shall not be used. The emergency stop button shall be red, the bypass switch shall preferably be yellow, the confirmation button shall preferably be black, and the test button shall preferably be white.

[0006] This specification does not clearly define the selection and specific implementation scheme of the emergency stop button, so either a single-contact button or a multi-contact button can meet the usage requirements.

[0007] The current problems are as follows:

[0008] 1. Equipment failure

[0009] In the interlock circuit, the relay works with electricity. After a long time, the probability of failure of the safety barrier is high, and the relay may also have problems with suction, resulting in the disconnection of the circuit and triggering the interlock.

[0010] 2. Line failure

[0011] The line from the emergency stop button to the control system cabinet is relatively long, and the wiring may be loose, interfered with, or bitten by small animals, resulting in the disconnection of the circuit and triggering the interlock.

[0012] 3. SIS system channel failure

[0013] The SIS system card channel may malfunction after long-term operation, causing false triggering of the interlock. Content of the Utility Model

[0014] The utility model provides an emergency stop button and its control circuit, which adopts a three-contact form for circuit control. Even if one contact of the emergency stop button fails or has poor contact, or a group of circuits is open-circuited, or a channel of the control system (SIS system) fails, the interlock will not be accidentally triggered, thereby improving the safety of the SIS system, reducing or even eliminating the unplanned shutdown caused by the failure of the emergency stop button and the circuit, reducing the serious risks brought to production by uncertain factors, and thus avoiding major economic losses.

[0015] An embodiment of this specification discloses an emergency stop button control circuit, which includes an SIS system, a logic controller built in the SIS system, and an emergency stop button, and further includes at least three groups of contacts provided on the emergency stop button;

[0016] Wherein, one contact of each group of the at least three groups of contacts is respectively connected to the logic controller, and the other contact of each group of the at least three groups of contacts is commonly or respectively connected to the logic controller.

[0017] An embodiment of this specification also discloses an emergency stop button, which uses the above-mentioned emergency stop button control circuit. The emergency stop button includes:

[0018] A button head;

[0019] A middle cavity, the top of which is penetrated by the button head from top to bottom, and a sliding groove is opened at its lower part;

[0020] A first spring, one end of which is connected to the inner bottom of the middle cavity, and the other end is connected to the part of the button head located in the middle cavity;

[0021] A bottom cavity, one contact of each group of the at least three groups of contacts is provided on its inner bottom, and its interior is communicated with the interior of the middle cavity through the sliding groove;

[0022] A transmission rod, one end of which is connected to the part of the button head located in the middle cavity, and the other end extends into the interior of the bottom cavity through the sliding groove;

[0023] A connecting plate, the top of which is connected to the part of the transmission rod extending into the bottom cavity, and the bottom of which is provided with the other contact of each group of the at least three groups of contacts;

[0024] Wherein, the two contacts of each group of the at least three groups of contacts are arranged vertically corresponding to each other and have the same vertical distance.

[0025] In some embodiments of this specification, there are 2 transmission rods, which are symmetrically arranged with the button head as the center, and 2 symmetrical sliding grooves are correspondingly opened at the lower part of the middle cavity.

[0026] In some embodiments of this specification, a baffle is provided on the button head, and the baffle is located above the connection between the button head and the transmission rod to prevent the button head from completely detaching from the middle cavity.

[0027] In some embodiments of this specification, the vertical height of the sliding groove is greater than the vertical distance length between the two contacts in each of the at least three groups of contacts, so that when the transmission rod moves up and down in the sliding groove, the transmission rod can indirectly make the two contacts in each of the at least three groups of contacts contact through the connecting plate.

[0028] In some embodiments of this specification, second springs are provided at both ends of the bottom of the connecting plate, and the ends of the second springs away from the connecting plate are connected to the inner bottom of the bottom cavity.

[0029] The embodiments of this specification can at least achieve the following beneficial effects:

[0030] The present utility model adopts a three-contact form for loop control, that is, one contact in each of the at least three groups of contacts is respectively connected to the logic controller, and the other contact in each of the at least three groups of contacts is commonly or respectively connected to the logic controller, that is, there are three different channels (emergency stop control loops). Even if one contact of the emergency stop button fails or has poor contact, or one loop is open-circuited, or one channel of the control system fails, the interlock will not be accidentally triggered, eliminating the risk of non-stop accidents caused by the failure of the emergency stop button loop, and effectively increasing the safety and fault tolerance of the SIS system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic diagram of the emergency stop button control loop involved in some embodiments of the present utility model.

[0033] Figure 2 It is a schematic diagram of the structure of the emergency stop button involved in some embodiments of the present utility model.

[0034] Reference numerals:

[0035] 1. Button head; 11. Baffle;

[0036] 2. Middle cavity; 21. Sliding groove;

[0037] 3. First spring; 4. Bottom cavity; 5. Transmission rod; 6. Connecting plate; 7. Contact; 8. Second spring. Detailed implementation manners

[0038] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0039] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0041] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0042] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0043] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0044] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, this embodiment provides an emergency stop button control circuit, including a SIS system, a logic controller built into the SIS system and an emergency stop button, and also includes at least three groups of contacts 7 arranged on the emergency stop button;

[0046] Among them, one contact 7 of each of the at least three groups of contacts 7 is respectively connected to the logic controller, and another contact 7 of each of the at least three groups of contacts 7 is connected to the logic controller jointly or separately.

[0047] It should be understood that the SIS system and its built-in logic controller are both devices in the prior art and will not be described here. The emergency stop button of this embodiment can be an emergency stop button in the prior art or an emergency stop button in the following embodiment. When there are three groups of contacts 7, each group has a pair of contacts 7, then the emergency stop button is a three-contact 7 button. Similarly, if there are four groups of contacts 7, then the emergency stop button is a four-contact 7 button, and so on. Other numbers of contacts 7 will not be repeated. In actual production situations, emergency stop buttons with a corresponding number of contacts 7 can be set according to the needs of each production. Figure 1 As shown, taking three groups of contacts 7A, B, and C and n devices to be controlled as an example, the connection relationship between the emergency stop button, the SIS system, the logic controller, and the devices to be controlled is illustrated.

[0048] It is understandable that the logic controller has a logic operation function, such as three-choice-two, three-choice-three, four-choice-two, four-choice-three, four-choice-four, etc. The emergency stop button has three groups of contacts 7, and the logic controller uses the three-choice-two logic operation function as an example. When the logic controller only receives one group of contact 7 signals, the logic controller will not take action (that is, it will not control the corresponding equipment to stop); only when the logic controller receives two or three groups of contact 7 signals, the logic controller will take action (that is, control the corresponding equipment to stop), thereby achieving the aforementioned purpose and effect. The description of other types of logic operations with different numbers of contacts 7 can be deduced in the same way.

[0049] The embodiment of this specification also discloses an emergency stop button, which uses the above-mentioned emergency stop button control circuit. The emergency stop button includes:

[0050] Button head 1;

[0051] Middle cavity 2, the top of which is penetrated by the button head 1 from top to bottom, and a sliding groove 21 is opened at its lower part;

[0052] First spring 3, one end of which is connected to the inner bottom of the middle cavity 2, and the other end is connected to the part of the button head 1 located inside the middle cavity 2;

[0053] Bottom cavity 4, one contact 7 of each group of the at least three groups of contacts 7 is provided at its inner bottom, and its interior is communicated with the interior of the middle cavity 2 through the sliding groove 21; (that is, the sliding groove 21 is actually a through hole penetrating the middle cavity 2)

[0054] Drive rod 5, one end of which is connected to the part of the button head 1 located inside the middle cavity 2, and the other end extends into the interior of the bottom cavity 4 through the sliding groove 21;

[0055] Connecting plate 6, the top of which is connected to the part of the drive rod 5 extending into the bottom cavity 4, and the bottom of which is provided with the other contact 7 of each group of the at least three groups of contacts 7;

[0056] Wherein, the two contacts 7 of each group of the at least three groups of contacts 7 are arranged vertically corresponding to each other and have the same vertical distance.

[0057] In this embodiment, the specific shapes and structures of the drive rod 5 and the connecting plate 6 are not particularly limited in this embodiment. It can refer to the structure shown in Figure 2 The structure shown, or can be set according to actual needs, as long as it can meet the functions of this embodiment. By pressing the button head 1, the button head 1 drives the drive rod 5 and the connecting plate 6 to move downward against the pressure of the first spring 3. The connecting plate 6 drives the other contact 7 of each group of the at least three groups of contacts 7 to move downward, so that it touches and presses against the corresponding contact 7, and then a contact 7 signal is generated. The logic controller will receive the contact 7 signal. As shown in Figure 2 Shown, it shows the structural diagram of an emergency stop button with three groups of contacts 7. For the structures of emergency stop buttons with other numbers of contacts 7, the corresponding number of contacts 7 can be added on the basis of this basic structure.

[0058] In some embodiments, there are 2 drive rods 5 and they are symmetrically arranged with the button head 1 as the center. Corresponding to this, 2 symmetrical sliding grooves 21 are opened at the lower part of the middle cavity 2.

[0059] In this embodiment, through the symmetrically arranged transmission rods 5 and sliding grooves 21, the contacts 7 can make more stable and better touches.

[0060] In some embodiments, the button head 1 is provided with a baffle 11, and the baffle 11 is located above the connection between the button head 1 and the transmission rod 5 to prevent the button head 1 from completely detaching from the middle cavity 2.

[0061] In this embodiment, the baffle 11 can prevent the button head 1 from completely detaching from the middle cavity 2.

[0062] In some embodiments, the vertical height of the sliding groove 21 is greater than the vertical distance length between the two contacts 7 in each of the at least three groups of contacts 7, so that when the transmission rod 5 moves up and down in the sliding groove 21, the transmission rod 5 can indirectly make the two contacts 7 in each of the at least three groups of contacts 7 contact through the connecting plate 6.

[0063] In this embodiment, through the limitation of the height and distance length, it is ensured that the contacts 7 can contact each other after the emergency stop button is pressed.

[0064] In some embodiments, second springs 8 are provided at both ends of the bottom of the connecting plate 6, and the ends of the second springs 8 away from the connecting plate 6 are connected to the inner bottom of the bottom cavity 4.

[0065] In this embodiment, by adding the second springs 8, they can jointly play a supporting role with the first springs 3, effectively preventing the contacts 7 from contacting each other when the emergency stop button is not pressed, and avoiding the situation of misoperation.

[0066] The above embodiments describe multiple specific embodiments of the present invention. However, those skilled in the art should understand that without departing from the principles and essence of the present invention, various changes or modifications can be made to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An emergency stop button control circuit, comprising an SIS system, a logic controller built into the SIS system and an emergency stop button, characterized in that: Also includes at least three groups of contacts arranged on the emergency stop button; Among them, one contact point of each of the at least three groups of contacts is respectively connected to the logic controller, and another contact point of each of the at least three groups of contacts is connected to the logic controller jointly or respectively.

2. An emergency stop button, characterized in that: Using the emergency stop button control circuit according to claim 1, the emergency stop button comprises: Button head; The middle cavity has a top that is penetrated from top to bottom by the button head, and a sliding groove is provided at the bottom; A first spring, one end of which is connected to the inner bottom of the middle cavity, and the other end of which is connected to the portion of the button head located in the middle cavity; A bottom cavity, wherein a contact of each of the at least three groups of contacts is disposed at its inner bottom, and the interior of the bottom cavity is connected to the interior of the middle cavity through the sliding groove; A transmission rod, one end of which is connected to the portion of the button head located in the middle cavity, and the other end of which extends into the bottom cavity through the sliding slot; a connecting plate, the top of which is connected to the portion of the transmission rod extending into the bottom cavity, and the bottom of which is provided with another contact of each of the at least three groups of contacts; Among them, the two contacts in each group of the at least three groups of contacts are arranged correspondingly up and down and have the same distance between them.

3. The emergency stop button according to claim 2, characterized in that: There are two transmission rods which are symmetrically arranged with the button head as the center, and two symmetrical sliding grooves are correspondingly opened at the lower part of the middle cavity.

4. The emergency stop button according to claim 2, characterized in that: The button head is provided with a baffle, and the baffle is located above the connection between the button head and the transmission rod to prevent the button head from completely separating from the middle cavity.

5. The emergency stop button according to claim 2, characterized in that: The vertical height of the sliding groove is greater than the up-down distance between the two contacts of each of the at least three groups of contacts, so that when the transmission rod moves up and down in the sliding groove, the transmission rod can indirectly make the two contacts of each of the at least three groups of contacts contact through the connecting plate.

6. The emergency stop button according to claim 2, characterized in that: Second springs are disposed at both ends of the bottom of the connecting plate, and one end of the second spring away from the connecting plate is connected to the inner bottom of the bottom cavity.

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