Explosion-proof device for limit switch

Abstract

The utility model provides an explosion-proof device for a limit switch. The explosion-proof device for the limit switch comprises a shell, a groove is formed in the shell, the shell is connected with a cover body through a screw, the cover body is matched with the groove, a waterproof ring is arranged on the shell, a cavity is formed in the shell, an insulation installation piece is fixedly installed on the shell, a waterproof mechanism is arranged on the shell, and the waterproof mechanism is arranged on the shell. A fixed block is fixedly mounted in the shell; through the waterproof mechanism, it is ensured that internal elements are not invaded by external substances, and the safety is improved; through the starting mechanism, the first conductive plate is in contact with the corresponding second conductive plate, so that the operation is convenient; and a cavity is formed in the device, so that the internal environment and the external environment of the switch can be effectively isolated, and the explosion risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion-proof limit switches, and in particular relates to an explosion-proof device for limit switches. Background Art

[0002] With the development of society, the use of explosion-proof limit switches is becoming more and more widespread, especially in engineering machinery. It is a field instrument for signal feedback to control its stroke or perform terminal limit protection. The existing explosion-proof limit switches for signal feedback are of various types and have diversity.

[0003] The existing limit switch has poor waterproof performance and is easily infiltrated with water, which may cause short circuits in the electronic components inside the limit switch or even leakage and other faults, thus affecting the normal operation. Therefore, it needs to be improved.

[0004] Therefore, it is necessary to provide a new explosion-proof device for limit switches to solve the above technical problems. Utility Model Content

[0005] The technical problem solved by the utility model is to provide an explosion-proof device for a limit switch, which ensures that internal components are not invaded by foreign substances through a waterproof mechanism, thereby improving the safety thereof; a first conductive plate and a corresponding second conductive plate are brought into contact through a starting mechanism, thereby facilitating operation; and a cavity is provided on the device, which can effectively isolate the internal and external environments of the switch, thereby reducing the risk of explosion.

[0006] In order to solve the above technical problems, the explosion-proof device for a limit switch provided by the utility model includes: a shell, a groove is provided on the shell, the shell is connected to a cover body by screws, the cover body is adapted to the groove, a waterproof ring is provided on the shell, a cavity is provided on the shell, an insulating mounting piece is fixedly installed on the shell, a waterproof mechanism is provided on the shell, a fixing block is fixedly installed in the shell, and a starting mechanism is provided in the shell; the waterproof mechanism includes a connecting pipe, a first nut, a first rubber ring, a second nut and a second rubber ring, the connecting pipe is fixedly installed on the shell, the first nut is screwed and connected with the connecting pipe thread, the first rubber ring is provided on the first nut, the second nut is screwed and connected with the connecting pipe thread, and the second rubber ring is provided on the second nut.

[0007] The waterproof mechanism also includes a locking piece and a connecting line. The locking piece is screwed and connected to the connecting pipe, and the connecting line is adapted to the connecting pipe.

[0008] The waterproof mechanism also includes a limiting block and a waterproof rubber piece. The limiting block is fixedly installed on the top of the shell, and the waterproof rubber piece is fixedly installed on the top of the limiting block.

[0009] The starting mechanism includes a support rod, a limit groove, a limit plate and a spring. The support rod is slidably connected to the fixed block. One end of the support rod extends into the waterproof rubber part. The limit groove is opened on the fixed block. The limit plate is fixedly installed on the support rod. The spring is slidably sleeved on the support rod. The top end of the spring is fixedly connected to the limit plate, and the bottom end of the spring is fixedly connected to the bottom inner wall of the limit groove.

[0010] The starting mechanism also includes a plurality of first conductive plates and a second conductive plate. The plurality of first conductive plates are fixedly mounted in the housing, and the second conductive plates are fixedly mounted on the support rods. The second conductive plates are matched with the corresponding first conductive plates.

[0011] The starting mechanism also includes a plurality of fixtures and a plurality of wires. The plurality of fixtures are fixedly mounted in the shell, one end of the plurality of wires are respectively fixedly connected to the corresponding first conductive plates, and the other ends of the plurality of wires are respectively fixedly connected to the corresponding fixtures.

[0012] Compared with the related art, the explosion-proof device for limit switch provided by the utility model has the following beneficial effects:

[0013] 1. The utility model uses a waterproof mechanism to pass the connecting wire through the connecting pipe to the housing, and then fix the connecting wire by twisting the locking piece. The first rubber ring and the second rubber ring can ensure that the internal components are not invaded by foreign substances, thereby effectively ensuring its sealing effect and improving its safety;

[0014] 2. The utility model uses a starting mechanism to press the support rod to move it, so that the first conductive plate can contact the corresponding second conductive plate. At the same time, a spring is provided to reset it without applying pressure, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the explosion-proof device for limit switch of the utility model;

[0017] Figure 2 This is a schematic diagram of the first split structure connection in the explosion-proof device for the limit switch of the utility model;

[0018] Figure 3 It is a schematic diagram of the structural connection of the explosion-proof device for the limit switch of the utility model in a front view and a cross-section;

[0019] Figure 4 It is a schematic diagram of the second split structure connection in the explosion-proof device for the limit switch of the utility model.

[0020] In the figure: 1. shell; 2. groove; 3. cover; 4. waterproof ring; 5. cavity; 6. insulating mounting member; 7. waterproof mechanism; 701. connecting pipe; 702. first nut; 703. first rubber ring; 704. second nut; 705. second rubber ring; 706. locking member; 707. connecting wire; 708. limit block; 709. waterproof rubber member; 8. fixing block; 9. starting mechanism; 901. support rod; 902. limit groove; 903. limit plate; 904. spring; 905. first conductive plate; 906. second conductive plate; 907. fixer; 908. wire. DETAILED DESCRIPTION

[0021] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in, Figure 1 It is a three-dimensional structural schematic diagram of the explosion-proof device for limit switch of the utility model; Figure 2 This is a schematic diagram of the first split structure connection in the explosion-proof device for the limit switch of the utility model; Figure 3 It is a schematic diagram of the structural connection of the explosion-proof device for the limit switch of the utility model in a front view and a cross-section; Figure 4 The second split structural connection diagram of the explosion-proof device for limit switch of the utility model is shown in FIG. The explosion-proof device for limit switch includes: a housing 1, a groove 2 is provided on the housing 1, a cover 3 is connected to the housing 1 by screws, the cover 3 is adapted to the groove 2, a waterproof ring 4 is provided on the housing 1, a cavity 5 is provided on the housing 1, an insulating mounting member 6 is fixedly installed on the housing 1, a waterproof mechanism 7 is provided on the housing 1, a fixing block 8 is fixedly installed in the housing 1, a starting mechanism 9 is provided in the housing 1, the waterproof mechanism 7 includes a connecting pipe 701, a first nut 702, a first rubber ring 703, a second nut 704 and a second rubber ring 705, the connecting pipe 701 is fixedly installed on the housing 1, the first nut 702 is threadedly screwed to the connecting pipe 701, the first rubber ring 703 is provided on the first nut 702, the second nut 704 is threadedly screwed to the connecting pipe 701, and the second rubber ring 705 is provided on the second nut 704.

[0022] The waterproof mechanism 7 further includes a locking member 706 and a connecting line 707. The locking member 706 is threadedly connected to the connecting pipe 701. The connecting line 707 is adapted to the connecting pipe 701. The waterproof mechanism 7 further includes a limiting block 708 and a waterproof rubber member 709. The limiting block 708 is fixedly mounted on the top of the housing 1. The waterproof rubber member 709 is fixedly mounted on the top of the limiting block 708.

[0023] Through the waterproof mechanism 7, the connecting wire 707 is passed through the connecting tube 701 to reach the shell 1, and then the connecting wire 707 is fixed by twisting the locking piece 706. The first rubber ring 703 and the second rubber ring 705 can ensure that the internal components are not invaded by foreign substances, thereby effectively ensuring its sealing effect and improving its safety.

[0024] The starting mechanism 9 includes a support rod 901, a limiting groove 902, a limiting plate 903 and a spring 904. The support rod 901 is slidably connected to the fixed block 8. One end of the support rod 901 extends into the waterproof rubber member 709. The limiting groove 902 is provided on the fixed block 8. The limiting plate 903 is fixedly mounted on the support rod 901. The spring 904 is slidably sleeved on the support rod 901. The top end of the spring 904 is fixedly connected to the limiting plate 903. The bottom end of the spring 904 is fixedly connected to the bottom inner wall of the limiting groove 902. The starting mechanism 9 also includes a plurality of A first conductive plate 905 and a second conductive plate 906, wherein the plurality of first conductive plates 905 are fixedly mounted in the housing 1, and the second conductive plates 906 are fixedly mounted on the support rod 901, and the second conductive plates 906 are adapted to the corresponding first conductive plates 905. The starting mechanism 9 further comprises a plurality of fixtures 907 and a plurality of wires 908, wherein the plurality of fixtures 907 are fixedly mounted in the housing 1, and one end of the plurality of wires 908 is fixedly connected to the corresponding first conductive plates 905, and the other end of the plurality of wires 908 is fixedly connected to the corresponding fixtures 907;

[0025] By starting the mechanism 9 and pressing the support rod 901 to move it, the first conductive plate 905 can contact the corresponding second conductive plate 906. A spring 904 is provided to reset it without applying pressure, which is convenient for operation.

[0026] The working principle of the explosion-proof device for limit switch provided by the utility model is as follows:

[0027] When it is needed, the connecting wire 707 is passed through the connecting tube 701 to reach the housing 1, and then the locking piece 706 is twisted to fix the connecting wire 707. The first rubber ring 703 and the second rubber ring 705 can ensure that the internal components are not invaded by foreign substances, thereby effectively ensuring its sealing effect and improving its safety. Then, the support rod 901 is pressed to move it, so that the first conductive plate 905 can contact the corresponding second conductive plate 906. At the same time, a spring 904 is provided to reset it without applying pressure, which is easy to operate. The device is provided with a cavity 5, which can effectively isolate the internal and external environments of the switch, prevent external sparks, explosive substances or harmful gases from entering the switch, thereby reducing the risk of explosion.

[0028] It should be noted that the equipment structure and drawings of the utility model mainly describe the principle of the utility model. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above utility model, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field;

[0029] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0030] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations or direct or indirect applications may be made to these embodiments without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the attached claims and their equivalents, which are equally included in the scope of patent protection of the present invention.

Claims

1. An explosion-proof device for a limit switch, characterized in that: The invention comprises: a shell, a groove is provided on the shell, a cover is connected to the shell by screws, the cover is adapted to the groove, a waterproof ring is provided on the shell, a cavity is provided on the shell, an insulating mounting piece is fixedly installed on the shell, a waterproof mechanism is provided on the shell, a fixing block is fixedly installed in the shell, and a starting mechanism is provided in the shell; The waterproof mechanism includes a connecting pipe, a first nut, a first rubber ring, a second nut and a second rubber ring, the connecting pipe is fixedly mounted on the housing, the first nut is screwed and connected with the connecting pipe thread, the first rubber ring is arranged on the first nut, the second nut is screwed and connected with the connecting pipe thread, and the second rubber ring is arranged on the second nut; The waterproof mechanism also includes a locking member and a connecting wire, wherein the locking member is screwed and connected to the connecting pipe, and the connecting wire is adapted to the connecting pipe; The waterproof mechanism further comprises a limit block and a waterproof rubber piece, wherein the limit block is fixedly mounted on the top of the housing, and the waterproof rubber piece is fixedly mounted on the top of the limit block; The starting mechanism includes a support rod, a limiting groove, a limiting plate and a spring, the support rod is slidably connected to the fixed block, one end of the support rod extends into the waterproof rubber member, the limiting groove is provided on the fixed block, the limiting plate is fixedly mounted on the support rod, the spring is slidably sleeved on the support rod, the top end of the spring is fixedly connected to the limiting plate, and the bottom end of the spring is fixedly connected to the bottom inner wall of the limiting groove; The starting mechanism also includes a plurality of first conductive plates and a second conductive plate, wherein the plurality of first conductive plates are fixedly mounted in the housing, and the second conductive plates are fixedly mounted on the support rod, and the second conductive plates are adapted to the corresponding first conductive plates; The starting mechanism also includes a plurality of fixtures and a plurality of wires. The plurality of fixtures are fixedly mounted in the shell, one end of the plurality of wires are respectively fixedly connected to the corresponding first conductive plates, and the other ends of the plurality of wires are respectively fixedly connected to the corresponding fixtures.

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