CN115755794A - An analog signal quick connector and connection method - Google Patents

Abstract

The invention relates to an analog quantity signal quick connecting piece, which comprises a DB37P female head used for connecting a domestic DCS system clamping piece and a DB25P female head used for connecting an import system terminal board, wherein a 37 core wire bundle is used for connecting the two female heads.

Description

An analog signal quick connector and connection method

technical field

The invention belongs to the field of process control, and in particular relates to an analog signal quick connector and a connection method.

Background technique

DCS system, namely Distributed Control System, distributed control system. It was gradually familiarized by people in the 1980s. After nearly 30 years of development, it has become the main control method for industrial production and manufacturing. In the early days, because the domestic DCS system has just started, many units have chosen to use foreign DCS systems. At present, many DCS systems have been used for more than 15 years, and they are facing difficulties in obtaining spare parts, rising prices, increasing maintenance costs, declining reliability, and limited capacity. And issues like skills gaps as people with experience with older systems retire. Legacy systems pose an increasing risk of downtime or loss of control, and the cost of mitigating these increases. At worst, it could jeopardize ongoing production operations.

The analog cards of the imported DCS control system are generally divided into three categories: AI, AO, and RTD, all of which have 8 channels. The entire card is composed of a module, a base, and a terminal block. The channel corresponds to 4 terminals, which can be respectively connected to two-wire transmitters, four-wire transmitters and three-wire transmitters, as shown in Figure 1 (a) to (d). The analog cards of the domestic DCS control system are generally divided into three categories: AI, AO, and RTD, all of which have 8 channels. The entire card is composed of a module and a base. Corresponding to 4 terminals, as shown in Figure 2(a) to (d). The main difference is that the positive and negative signal terminals of the power supply are different, and the temperature common terminal is different.

The DCS system is the central nervous system of industrial control. To replace it with localization, the original DCS control system needs to be shut down. After the analog signal connected to the imported system is removed, it is reconnected to the domestic system. Due to the large number of cables, insufficient cable length, and small working space, the wiring work takes a long time and is prone to errors. If the DCS system is out of service, production and operation will be out of service, resulting in a large loss of profits. Therefore, the length of the construction period for implementing the localization of the DCS system directly affects the size of the profit loss.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the present invention provides an analog signal quick connector and a connection method.

This application proposes a quick connector for analog signals, including a DB37P female connector for connecting the domestic DCS system card, and a DB25P female connector for connecting the terminal board of the imported system. A 37-core wire harness is used in the middle to connect the two female connectors. The connection sequence of the wire cores is adjusted and connected according to the positive and negative polarity of the analog card terminals in the two DCS systems and the common terminal of the temperature sensor, and finally realizes the interconnection of the two control systems.

Specifically, the 37-core wire is composed of 37 0.75 mm2 copper core cables twisted in pairs with an external copper wire shielding layer, an aluminum foil protection layer and a polyvinyl chloride insulation layer, and the wire diameter is between φ10-15mm.

Specifically, a fast connection method for analog signals is the first subject: a domestically produced analog module, which is placed in a domestic DCS cabinet to communicate with the controller, and the module base is equipped with a DB37P male input and output connection port;

The second main body: the imported analog module terminal board, which is placed in the imported DCS cabinet to connect and communicate with the imported DCS analog module. One side is a common terminal block, and the other side is a DB25P male input and output connection port;

The quick connector connects the domestic analog module and the imported analog module terminal board to realize the acquisition of field transmitter signals and the control of actuators.

Compared with the prior art, the present invention has the following beneficial effects:

1. Utilize the connection method and quick connector of the present invention to connect the domestic system analog card and the imported system analog terminal board, which changes the existing inherent idea of using ordinary multi-core cables to connect equipment, and solves the problem of ordinary cable disconnection. Long time, error-prone problems, greatly improving work efficiency and wiring accuracy.

2. Study the positive and negative poles of the analog card channel of the domestic system and the positive and negative poles of the analog card of the imported system, and use a reasonable line sequence to connect different DB pinholes to solve the difference between the positive and negative poles of each channel in the two systems The problem.

3. In a single case, using the present invention to replace the localized DCS control system shortens the upgrade period, reduces the workload, realizes the localized replacement of the non-stop control system of the project, avoids the impact on the production process, and greatly The impact on economic profit is reduced, and it also opens a precedent for system upgrades in the industry.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 (a)-(d) respectively shows the wiring mode and power supply principle of an analog input channel on the analog input module in the DCS cabinet of the imported system of different types of field transmitters in the prior art;

Figure 2(a)-(d) respectively show the connection mode and power supply principle of different types of field transmitters in the prior art and an analog input channel on the analog input module in the DCS cabinet of the domestic system;

Fig. 3 shows the schematic diagram of the principle of the docking of the domestic system and the imported system analog module according to the present invention;

Figure 4 shows a schematic diagram of a DB37P female head of the device according to the present invention;

Figure 5 shows a schematic diagram of a DB25P female head of the device according to the present invention;

Figure 6 shows a schematic diagram of the overall structure of the device according to the present invention;

reference sign

1. Imported system analog input module (AI); 2. Imported system analog output module (AO); 3. Imported system temperature signal input module (RTD); 4. Connection cable between imported system analog module and terminal board ;5. Imported system analog input terminal board (AI); 6. Imported system analog output terminal board (AO); 7. Imported system temperature signal input terminal board (RTD); 8. Two-wire transmitter; 9. Four-wire transmitter; 10. Two-wire actuator; 11. Temperature sensor; 12. Domestic system analog input module and base (AI); 13. Domestic system analog output module and base (AI); 14. Domestic System temperature signal input module and base (RTD); 201, the first main body, domestic DCS system analog card; 202, quick connector; 203, the second main body, imported DCS system analog terminal board; 4-1, DB25P The seventh group of wiring pinholes of the female head; 4-2, the eighth group of wiring pinholes of the DB25P female head; 4-3, the fixing bolts of the DB25P female head; 4-4, the second row of wiring pinholes of the DB25P female head; 5-1 , DB37P female first row wiring pinholes; 5-2, DB37P female first group wiring pinholes; 5-3, DB37P female second group wiring pinholes; 5-4, DB37P female fixing bolts; 6 -1, DB37P female head; 6-2, DB25P female head; 6-3, 37-core wire harness.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

A fast connector for analog signal, including DB37P female connector for connecting domestic DCS system card, DB25P female connector for connecting terminal board of imported system, 37-core wire harness is used to connect two female connectors in the middle, and the connection sequence of wire cores Adjust the connection according to the positive and negative polarity of the analog card terminal in the two DCS systems and the common terminal of the temperature sensor, and finally realize the interconnection of the two control systems.

Specifically, the length of the 37 core wires in this embodiment is 10 meters, and it is composed of 37 copper core cables of 0.75 square millimeters twisted in pairs, an external copper wire shielding layer, an aluminum foil protective layer and a polyvinyl chloride insulating layer, and the wire diameter is φ10- Between 15mm.

Further, there are 37 pinholes in the DB37P female head described in this embodiment, which are arranged in two rows: the first row has 19 holes, the hole sequence is 1-19 holes, and the second row has 18 holes in total. The sequence is 20-37 holes, and fastening screws are installed at both ends.

On the side of the DB37P connector, divide the 37-core wiring harness into a group of four cores, and divide it into nine groups on the DB37P side, and group them according to the line sequence of the DB37 male connector on the analog card base of the new system. Group (1, 20, 2, 21); Group Two (3, 22, 4, 23); Group Three (5, 24, 6, 25); Group Four (7, 26, 8, 27); Group Five ( 9, 28, 10, 29); six groups (11, 30, 12, 31); seven groups (13, 32, 14, 33); eight groups (15, 34, 16, 35); nine groups (17, 36, 18, 37).

There are 25 pinholes in the DB25P female head, which are arranged in upper and lower rows. The first row has 13 holes in total, the hole sequence is 1-13 holes, the second row has 12 holes in total, the hole sequence is 14-25 holes, and fastening screws are installed at both ends.

On the side of the DB25P connector, select three cores from the four cores grouped by the DB37 head, and divide them into eight groups according to the line sequence of the DB25 male connector on the old system terminal board. Two groups (23, 24, 11); three groups (9, 10, 22); four groups (20, 21, 8); five groups (6, 7, 19); six groups (17, 18, 5); Seven groups (3, 4, 16); eight groups (14, 15, 2).

The 10-meter 37-core cable is on the side of the DB37P female head. Every four holes form a group. According to the hole sequence 1, 20, 2, and 21, it is the first group. The holes are one group, according to the hole sequence 12, 13, 25 as the first group, it is divided into 8 groups in total; the first group of line sequence is connected with 1-12, 20-13, 2-25, 21-empty in detail.

DB female connectors used on both ends of the DB cable.

37-pin holes are used to connect the female end of the domestic system, and 25 pin holes are used to connect to the imported DCS system, and the number of connection pins is 37 pins to 25 pins.

The interconnection device shown in Figure 6 includes a DB37P connector, a DB25P connector and a 10-meter-long 37-core wire harness.

As shown in Figure 5, there are 37 pinholes in the DB37P female connector, which are arranged in two rows. As shown in Figure 5-1, there are 19 holes in the first row, and the hole sequence is 1-19 holes.

As shown in Figure 5-2, each group of four holes is divided into nine groups in total, and the housing is provided with fixing bolts (as shown in Figure 5-4).

As shown in Figure 4, there are 25 pinholes in the DB25P female head, which are arranged in two rows. As shown in Figure 4-4, there are 12 holes in the second row, and the hole sequence is 14-25 holes. As shown in Figure 4-1 and 4-2, every three holes are used as a group, which is divided into nine groups in total. The shell is equipped with fixing bolts. (as shown in Figure 4-3).

After the grouping is completed, according to the power supply mode of the two DCS system analog cards, adjust the connection sequence of the female pinholes on both sides, specifically: one group (1-12, 20-13, 2-25, 21-empty) ; two groups (3-23, 22-24, 4-11, 23-empty); three groups (5-9, 24-10, 6-22, 25-empty); four groups (7-20, 26- 21, 8-8, 27-null); five groups (9-6, 28-7, 10-19, 29-null); six groups (11-17, 30-18, 12-5, 31-null) ; seven groups (13-3, 32-4, 14-16, 33-empty); eight groups (15-14, 34-15, 16-2, 35-empty); nine groups (17-empty, 36- Empty, 18-empty, 37-empty) are connected, and all connections are completed.

As shown in Figure 3, the 201 domestic DCS system analog card is directly connected to the 203 imported DCS system analog terminal board by using the 202 quick connector.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (3)

1. An analog signal quick connector, characterized in that: it includes a DB37P female head for connecting the domestic DCS system card, a DB25P female head for connecting the terminal board of the imported system, and a 37-core wire harness in the middle to connect two The connection sequence of the female head and the wire core is adjusted and connected according to the positive and negative polarity of the analog card terminal in the two DCS systems and the common terminal of the temperature sensor, and finally realizes the interconnection of the two control systems. 2. An analog signal quick connector according to claim 1, characterized in that: the 37-core wire is made of 37 0.75 square millimeter copper core cables twisted in pairs, the outer copper wire shielding layer, and the aluminum foil protection Layer and polyvinyl chloride insulation layer, the wire diameter is between φ10-15mm. 3. A fast connection method for analog signals according to claim 1, characterized in that: the first main body: a domestic analog module, placed in a domestic DCS cabinet to communicate with the controller, the module base has DB37P male input and output connection port; The second main body: the imported analog module terminal board, which is placed in the imported DCS cabinet to connect and communicate with the imported DCS analog module. One side is a common terminal block, and the other side is a DB25P male input and output connection port; The quick connector connects the domestic analog module and the imported analog module terminal board to realize the acquisition of field transmitter signals and the control of actuators.

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