Three-wire system detection switch conversion device and three-wire system detection switch

Abstract

The utility model discloses a three-wire system detection switch conversion device, and belongs to the technical field of measuring instruments. The three-wire system detection switch conversion device comprises a power supply anode input terminal, a signal input terminal, an intermediate relay and a power supply cathode input terminal, the power supply anode input terminal is electrically connected with a first fuse, and a signal line of a three-wire system detection switch is electrically connected with the signal input terminal; the intermediate relay comprises a coil and a normally open switch, the first end of the coil is electrically connected with the signal input terminal, the second end of the coil is electrically connected with a change-over switch, and the second end of the coil is electrically connected with the normally open switch; the power supply cathode input terminal is electrically connected with a second fuse; the first end of the change-over switch is electrically connected with the coil, the second end of the change-over switch is electrically connected with the power supply anode input terminal, and the third end of the change-over switch is electrically connected with the power supply cathode input terminal. Type conversion between an NPN switch and a PNP switch can be realized, the safety is high, and the problem of poor safety of switch conversion is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instruments, in particular to a three-wire detection switch conversion device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Photoelectric switches, proximity switches and other non-contact detection switches are currently widely used in various fields such as industry, civil, and national defense. They have many advantages such as mature technology and stable performance. Its working principle is mainly based on the PNP or NPN characteristics of the transistor to realize the on and off of the signal. Taking the three-wire photoelectric switch as an example, generally two of the wires are the positive and negative power lines (L+, L-), and the third line is the signal line. When the PNP type photoelectric switch is activated, the signal line outputs L+; when the NPN type photoelectric switch is activated, the signal line outputs L-.

[0004] Due to different usage standards, different brands and models of industrial equipment may use different types of switches. In actual on-site usage scenarios, when installing or replacing photoelectric switches or proximity switches, special attention should be paid to the PNP and NPN types of the switches, as the two are generally not interchangeable. There is a phenomenon that the normal use of industrial equipment is affected by different switch types.

[0005] Existing switch conversion devices usually perform switch conversion through transistors. When working, a certain voltage needs to be added to the base to control the current of the transistor, thereby controlling the switching state of the circuit. The circuit is highly complex and has poor reliability. In a high current environment, the safety is poor.

[0006] Furthermore, triode-based switching switches are not easy to maintain. Once a device fails, it can only be replaced as a whole, which results in high maintenance costs. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of the embodiments of the utility model is to provide a three-wire detection switch conversion device and a three-wire detection switch, which have a simple structure, easy maintenance, low cost, high safety, and can improve the versatility of various equipment to a certain extent, reduce maintenance costs and risks, and reduce inventory pressure.

[0008] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0009] A three-wire detection switch conversion device, comprising:

[0010] A positive power input terminal, to which the positive power of the three-wire detection switch is electrically connected, and the positive power input terminal is electrically connected to a first fuse;

[0011] A signal input terminal, to which a signal line of a three-wire detection switch is electrically connected;

[0012] An intermediate relay, the intermediate relay comprising a coil and a normally open switch, a first end of the coil being electrically connected to the signal input terminal, a second end of the coil being electrically connected to a conversion switch, and a second end of the coil being electrically connected to the normally open switch;

[0013] A negative power input terminal, the negative power of the three-wire detection switch is electrically connected to the negative power input terminal, and the negative power input terminal is electrically connected to a second fuse;

[0014] The first end of the conversion switch is electrically connected to the coil, the second end of the conversion switch is electrically connected to the positive input terminal of the power supply, and the third end of the conversion switch is electrically connected to the negative input terminal of the power supply.

[0015] By adopting the above technical solution, the positive input terminal of the power supply, the signal input terminal and the negative input terminal of the power supply are connected to the detection switch, so that the first end and the second end of the conversion switch are in contact, and the NPN to PNP function is realized. The first end and the third end of the conversion switch are in contact to realize the PNP to NPN function, and the operation is simple; and a fuse is set in the circuit, which can protect the components in extreme cases and improve the safety of the device.

[0016] Furthermore, the conversion switch is a knob switch or a jumper terminal.

[0017] By adopting the above technical solution, a conversion switch is installed outside the device, or a jumper terminal is installed inside the device, so as to realize the function switching of PNP to NPN or NPN to PNP.

[0018] Furthermore, it also includes:

[0019] A positive terminal of the power supply after conversion, the first fuse being electrically connected to the positive terminal of the power supply after conversion, and the positive terminal of the power supply after conversion being electrically connected to the positive electrode of the power supply;

[0020] a post-conversion signal line connection terminal, the normally open switch being electrically connected to the post-conversion signal line connection terminal, and the post-conversion signal line connection terminal being electrically connected to the post-conversion signal line;

[0021] The converted power supply negative electrode terminal, the second fuse is electrically connected to the converted power supply negative electrode terminal, and the converted power supply negative electrode terminal is electrically connected to the negative electrode of the power supply.

[0022] By adopting the above technical solution, the conversion of the signal type is achieved by connecting the converted power positive terminal, the converted signal line terminal and the converted power negative terminal to the converted signal line.

[0023] Preferably, it further comprises a housing and a circuit board, the intermediate relay, the first fuse and the second fuse are arranged on the circuit board, and the circuit board is arranged inside the housing.

[0024] Further preferably, the shell is provided with a plurality of through holes, and the positive power input terminal, the signal input terminal, the negative power input terminal, the converted positive power terminal, the converted signal line terminal and the converted negative power terminal are arranged on the shell through corresponding through holes.

[0025] By adopting the above technical solution, the wiring terminals are clearly marked, which is convenient for personnel to connect and set; if the wiring is wrong, it will only cause the switch to not work, and will not damage the switch itself. The structure is simple and the safety is high.

[0026] Further preferably, the conversion switch is a knob switch, and the knob switch is arranged on the housing.

[0027] By adopting the above technical solution, the operator can select the conversion type using the knob switch, which is easy to operate.

[0028] Further preferably, the conversion switch is a jumper terminal, and the jumper terminal is arranged inside the shell.

[0029] Furthermore, the first fuse is a fuse, and the second fuse is a fuse.

[0030] Furthermore, the intermediate relay is a 24VDC intermediate relay.

[0031] The embodiment of the utility model further provides a three-wire detection switch, comprising the above-mentioned three-wire detection switch conversion device.

[0032] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0033] 1. The technical solution provided by the utility model realizes the conversion of switch type by relays and conversion switches. In some occasions where the signal type needs to be changed but it is inconvenient or unnecessary to replace the switch, this device can meet the working condition requirements.

[0034] 2. The technical solution provided by the utility model has a simple structure, convenient maintenance, low cost, high safety, and can improve the versatility of various equipment to a certain extent, reduce maintenance costs and risks, and reduce inventory pressure.

[0035] 3. The technical solution provided by the utility model has a wide range of application scenarios. When purchasing spare parts, users no longer need to consider the PNP and NPN types of photoelectric switches, proximity switches, etc., and can purchase only one type according to actual conditions, such as purchasing only PNP type switches. When the actual use scenario on site requires an NPN type switch, only a PNP type switch is needed in conjunction with this device to realize the PNP to NPN function, so that the equipment can be used normally, saving maintenance costs and reducing corporate inventory.

[0036] 4. The technical solution provided by the utility model is based on the design of a transfer switch for relays, which has the characteristics of simple structure and modularity. Once a fault occurs, the fuse or relay can generally be replaced to continue normal use, and maintenance is simple and cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0038] Figure 1 This is a circuit connection diagram of a three-wire detection switch conversion device provided by an embodiment of the utility model;

[0039] Figure 2 It is a front view schematic diagram of a three-wire detection switch conversion device provided by an embodiment of the utility model;

[0040] Figure 3 It is another front view schematic diagram of the three-wire detection switch conversion device provided by the embodiment of the utility model;

[0041] In the figure: A, housing; B, knob switch; C, jumper terminal.

[0042] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0043] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] Embodiment 1

[0045] As introduced in the background technology, the switch type conversion device in the prior art has a complex circuit structure, poor stability and potential safety hazards. In order to solve the above technical problems, the utility model proposes a three-wire detection switch conversion device.

[0046] Combination Figure 1-Figure 2 In this embodiment, a three-wire detection switch conversion device is described, which includes a housing A, an intermediate relay and a circuit board. The housing A is provided with a positive power input terminal, a signal input terminal, a negative power input terminal, a positive power connection terminal after conversion, a signal line connection terminal after conversion and a negative power connection terminal after conversion. The positive power input terminal, the signal input terminal and the negative power input terminal are located in the upper half of the housing A, and are marked with 4, 5 and 6 respectively on the housing A. The positive power connection terminal after conversion, the signal line connection terminal after conversion and the negative power connection terminal after conversion are located in the lower half of the housing A, and are marked with 1, 2 and 3 respectively. The intermediate relay, the first fuse and the second fuse are arranged on the circuit board, and the circuit board is installed inside the housing A.

[0047] The positive pole of the power supply of the three-wire detection switch is electrically connected to the positive pole input terminal 4 of the power supply, and the positive pole input terminal 4 of the power supply is electrically connected to the first fuse FU1; the negative pole of the power supply of the three-wire detection switch is electrically connected to the negative pole input terminal 6 of the power supply, and the negative pole input terminal 6 of the power supply is electrically connected to the second fuse FU2; the safety of the device is improved by setting the fuse.

[0048] The signal line of the three-wire detection switch is electrically connected to the signal input terminal 5, the intermediate relay KA includes a coil and a normally open switch, the first end 14 of the coil is electrically connected to the signal input terminal 2, the second end 13 of the coil is electrically connected to the switching switch, and the second end 13 of the coil is electrically connected to the first end 12 of the normally open switch; the first end J2 of the switching switch is electrically connected to the second end 13 of the coil, the second end J1 of the switching switch is electrically connected to the positive input terminal 4 of the power supply, and the third end J3 of the switching switch is electrically connected to the negative input terminal 6 of the power supply.

[0049] The first fuse FU1 is electrically connected to the positive terminal 1 of the converted power supply, and the positive terminal 1 of the converted power supply is electrically connected to the positive pole of the power supply; the second end 8 of the normally open switch is electrically connected to the signal line terminal 2 after conversion, and the signal line terminal 2 after conversion is electrically connected to the converted signal line; the second fuse FU2 is electrically connected to the negative terminal 3 of the converted power supply, and the negative terminal 3 of the converted power supply is electrically connected to the negative pole of the power supply.

[0050] In this embodiment, the conversion switch is a knob switch B, the first fuse is a fuse, the second fuse is a fuse, and the intermediate relay is a 24VDC intermediate relay.

[0051] The working method of this embodiment is as follows:

[0052] If you want to convert the NPN switch to PNP, close J1 and J2. At this time, the coil is energized, the normally open switch is closed, the positive input terminal 4 of the power supply, the conversion switch, and the normally open switch form a path, and the signal line outputs L+.

[0053] If you want to convert the PNP switch to NPN, close J2 and J3. At this time, the coil is energized, the normally open switch is closed, the negative input terminal 6 of the power supply, the conversion switch, and the normally open switch form a path, and the signal line outputs L-.

[0054] As an implementation mode, in some embodiments, combined with Figure 3 The conversion switch is a jumper terminal C. Jumper terminals CJ1, J2, and J3 are arranged on the circuit board. When in use, the short-circuit between J1 and J2 or the short-circuit between J3 and J2 is achieved through the short-circuit piece, thereby realizing the conversion of the switch type.

[0055] Embodiment 2

[0056] Based on the above-mentioned three-wire detection switch conversion device, an embodiment of the utility model also provides a three-wire detection switch, which can be connected to a three-wire detection switch conversion device. Since the above-mentioned three-wire detection switch conversion device has the above-mentioned technical effects, the technical effects of the three-wire detection switch using the three-wire detection switch conversion device please refer to the above-mentioned embodiment.

[0057] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A three-wire detection switch conversion device, characterized in that: include: A power positive input terminal, to which the power positive of the three-wire detection switch is electrically connected, and the power positive input terminal is electrically connected to a first fuse; A signal input terminal, to which a signal line of a three-wire detection switch is electrically connected; An intermediate relay, the intermediate relay comprising a coil and a normally open switch, a first end of the coil being electrically connected to the signal input terminal, a second end of the coil being electrically connected to a conversion switch, and a second end of the coil being electrically connected to the normally open switch; A negative power input terminal, the negative power of the three-wire detection switch is electrically connected to the negative power input terminal, and the negative power input terminal is electrically connected to a second fuse; The first end of the conversion switch is electrically connected to the coil, the second end of the conversion switch is electrically connected to the positive input terminal of the power supply, and the third end of the conversion switch is electrically connected to the negative input terminal of the power supply.

2. The three-wire detection switch conversion device according to claim 1, characterized in that: The conversion switch is a knob switch or a jumper terminal.

3. The three-wire detection switch conversion device according to claim 1, characterized in that: Also includes: A positive terminal of the power supply after conversion, the first fuse being electrically connected to the positive terminal of the power supply after conversion, and the positive terminal of the power supply after conversion being electrically connected to the positive electrode of the power supply; a post-conversion signal line connection terminal, the normally open switch being electrically connected to the post-conversion signal line connection terminal, and the post-conversion signal line connection terminal being electrically connected to the post-conversion signal line; The converted power supply negative electrode terminal, the second fuse is electrically connected to the converted power supply negative electrode terminal, and the converted power supply negative electrode terminal is electrically connected to the negative electrode of the power supply.

4. The three-wire detection switch conversion device according to claim 3, characterized in that: It also includes a shell and a circuit board, the intermediate relay, the first fuse and the second fuse are arranged on the circuit board, and the circuit board is arranged inside the shell.

5. The three-wire detection switch conversion device according to claim 4, characterized in that: The shell is provided with a plurality of through holes, and the positive power input terminal, the signal input terminal, the negative power input terminal, the converted positive power connection terminal, the converted signal line connection terminal and the converted negative power connection terminal are arranged on the shell through the corresponding through holes.

6. The three-wire detection switch conversion device according to claim 4, characterized in that: The conversion switch is a knob switch, and the knob switch is arranged on the housing.

7. The three-wire detection switch conversion device according to claim 4, characterized in that: The conversion switch is a jumper terminal, and the jumper terminal is arranged inside the shell.

8. The three-wire detection switch conversion device according to claim 1, characterized in that: The first fuse is a fuse, and the second fuse is a fuse.

9. The three-wire detection switch conversion device according to claim 1, characterized in that: The intermediate relay is a 24VDC intermediate relay.

10. A three-wire detection switch, characterized in that: It comprises the three-wire detection switch conversion device as described in any one of claims 1-9.

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