Limit switch

Abstract

The utility model discloses a limit switch, and relates to the technical field of limit switch supports. The pneumatic valve comprises a valve body, a pneumatic actuator is arranged above the valve body, the pneumatic valve further comprises a first installation mechanism, the first installation mechanism is used for installing the pneumatic actuator above the valve body, and two travel switches are fixedly installed on the top of the pneumatic actuator. A double-end swing arm is arranged between the two travel switches, and a plurality of rolling pipes are arranged above the double-end swing arm. When the valve is used, a user enables the valve to be communicated with a pipeline system, the valve can be controlled through the pneumatic actuator in the using process, the rotating shaft of the pneumatic actuator can drive the double-end swing arm to swing in the operating process of the pneumatic actuator, and therefore the valve can be controlled through the double-end swing arm. When the idler wheel on the surface of the double-end swing arm swings to the surface of any cam of the two travel switches, detection of opening or closing information of the valve can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of limit switch brackets, in particular to a limit switch. Background Art

[0002] A pneumatic valve limit switch is a device used to detect and control the position of a pneumatic valve. It is usually used in valve automation control systems and is installed above the pneumatic actuator. Its function is to monitor the open or closed position of the valve and provide feedback signals to the control system in order to accurately monitor and control the valve position.

[0003] The existing limit switches installed on valves are generally limit switch boxes, which use cams to contact micro switches to achieve electrical on and off. When the number of switches is frequent or after long-term use, sometimes the micro switch in the limit switch box will not contact well, which may cause the system to report valve failure, thus affecting production. Therefore, a new type of limit switch is needed to solve the above problems. Summary of the invention

[0004] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0005] A limit switch comprises: a valve, a pneumatic actuator is arranged above the valve, and also comprises a first mounting mechanism, the first mounting mechanism is used to mount the pneumatic actuator above the valve, two travel switches are fixedly mounted on the top of the pneumatic actuator, a double-headed swing arm is arranged between the two travel switches, a plurality of rolling tubes are arranged above the double-headed swing arm, and the plurality of rolling tubes are arranged in pairs, and also comprises a second mounting mechanism and a limit mechanism, the second mounting mechanism is used to mount the double-headed swing arm on the surface of the rotating shaft of the pneumatic actuator, and the limit mechanism is used to respectively limit the plurality of rolling tubes above the double-headed swing arm.

[0006] Furthermore, the first mounting mechanism comprises a flange fixedly sleeved on the surface of the valve, a plurality of mounting bolts are threadedly inserted on the surface of the flange, and surfaces of the plurality of mounting bolts are threadedly inserted on the surface of the pneumatic actuator.

[0007] Furthermore, the second mounting mechanism includes a mounting head arranged at one end of the rotating shaft of the pneumatic actuator, the double-headed swing arm is slidably sleeved on the surface of the mounting head, an insertion rod is fixedly installed on the surface of the mounting head, the insertion rod is slidably inserted into the surface of the double-headed swing arm and a mounting sleeve is threadedly sleeved on the surface.

[0008] Furthermore, the limiting mechanism includes two limiting rods which are slidably inserted into the surface of the double-headed swing arm, and a plurality of rolling tubes are respectively rotatably sleeved on the surfaces of the two limiting rods, and the surfaces of the two limiting rods are both threadedly sleeved with limiting sleeves.

[0009] Furthermore, an inclined rod is fixedly installed on the surface of the double-headed swing arm.

[0010] The beneficial effects of the utility model are as follows:

[0011] When the utility model is used, the user connects the valve to the system of the pipeline. During use, the valve can be controlled by the pneumatic actuator. During the operation of the pneumatic actuator, its rotating shaft will drive the swing of the double-headed swing arm. When the roller on the surface of the double-headed swing arm swings to the cam surface of any one of the two travel switches, the information on whether the valve is opened or closed can be detected. In actual use, the two travel switches will be connected to the control system, so that the operator can obtain the data on whether the valve is opened or closed. This method has a simple structure and reliable operation. Especially for pneumatic valves with frequent switching times, it can operate stably for a long time, reduce the failure rate of the valve, save costs for the enterprise, and provide guarantee for normal production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 It is a partial three-dimensional structural schematic diagram of the utility model;

[0014] Figure 3 It is a side view of the utility model;

[0015] Figure 4 It is a partial schematic diagram of a half-section view of the utility model.

[0016] Figure numerals: 1. valve; 2. pneumatic actuator; 3. first mounting mechanism; 301. flange; 302. mounting bolt; 4. travel switch; 5. double-headed swing arm; 6. rolling tube; 7. second mounting mechanism; 701. mounting head; 702. insert rod; 703. mounting sleeve; 8. limiting mechanism; 801. limiting rod; 802. limiting sleeve; 9. inclined rod. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0018] The present application provides a limit switch, which is mainly used to solve the problem that the existing limit switches installed on valves are generally limit switch boxes, and the internal cam contacts the micro switch to achieve electrical on and off. When the number of switches is frequent or the use time is long, sometimes the micro switch in the limit switch box will not contact well, which may cause the system to report valve failure, thus affecting production. The following technical solutions are provided. Figure 1-Figure 4 Make a detailed description:

[0019] A limit switch comprises: a valve 1 with a pneumatic actuator 2 arranged on the top. The user can connect the pneumatic actuator 2 with the axis of the valve 1, and then install the pneumatic actuator 2 on the top of the valve 1 through a first installation mechanism 3. At the same time, two travel switches 4 are fixedly installed on the top of the pneumatic actuator 2. During the operation of the pneumatic actuator 2, a double-headed swing arm 5 above it will be driven to swing. The double-headed swing arm 5 has two swinging ends, and two rolling wheels are arranged above the two swinging ends. The user can install the double-headed swing arm 5 and the vibration shaft surface of the pneumatic actuator 2 through a second installation mechanism 7, and realize the disassembly and assembly of several rolling wheels through a limit mechanism 8. During the swinging of the double-headed swing arm 5, its two swinging ends will respectively contact the surface of any one cam of the two travel switches 4, so that the data of the closed state of the valve 1 can be detected by triggering the two travel switches 4 respectively. Compared with the traditional limit switch box, this method is not easy to be damaged and is more practical. The main function of the first installation mechanism 3 is to It is composed of: a flange 301 fixedly sleeved on the surface of the valve 1. When in use, the user inserts a plurality of mounting bolts 302 into the surface of the flange 301 through threads, so that the plurality of mounting bolts 302 are simultaneously threadedly inserted into the surface of the pneumatic actuator 2, thereby realizing the installation of the valve 1 and the pneumatic actuator 2. The second mounting mechanism 7 is mainly composed of: a mounting head 701 arranged at one end of the rotating shaft of the pneumatic actuator 2. After the user slides the double-headed swing arm 5 onto the surface of the mounting head 701, the insertion rod 702 on the surface of the mounting head 701 will be inserted into the surface of the double-headed swing arm 5. The user threads the mounting sleeve 703 on the surface of the insertion rod 702 to complete the installation of the double-headed swing arm 5. The limiting mechanism 8 is mainly composed of: two limiting rods 801 both slidably inserted into the surface of the double-headed swing arm 5. After the user sleeves a plurality of rolling tubes 6 on the surfaces of the two limiting rods 801 in pairs, the limiting sleeves 802 are threadedly sleeved on the surfaces of the two limiting rods 801 to complete the installation of the plurality of rolling tubes 6.

[0020] When in use, after the user connects the valve 1 to the pipeline system, the valve 1 can be controlled by the pneumatic actuator 2 during use. During the operation of the pneumatic actuator 2, its rotating shaft will drive the swing of the double-headed swing arm 5. When the roller on the surface of the double-headed swing arm 5 swings to the cam surface of any one of the two travel switches 4, the information on whether the valve 1 is opened or closed can be detected. In actual use, the two travel switches 4 will be connected to the control system so that the operator can obtain the data on whether the valve 1 is opened or closed. This method has a simple structure and reliable operation. Especially on the pneumatic valve 1 with frequent switching times, it can operate stably for a long time, reduce the failure rate of the valve 1, save costs for the enterprise, and provide guarantee for normal production.

[0021] like Figure 1 As shown, in some embodiments, in order to further optimize the solution, an inclined rod 9 for taking the double-headed swing arm 5 is fixedly installed on the surface of the double-headed swing arm 5.

[0022] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A limit switch, characterized in that: include: A valve (1), wherein a pneumatic actuator (2) is arranged above the valve (1), and further comprising a first mounting mechanism (3), wherein the first mounting mechanism (3) is used to mount the pneumatic actuator (2) above the valve (1), wherein two travel switches (4) are fixedly mounted on the top of the pneumatic actuator (2), wherein a double-headed swing arm (5) is arranged between the two travel switches (4), wherein a plurality of rolling tubes (6) are arranged above the double-headed swing arm (5), wherein the plurality of rolling tubes (6) are arranged in pairs, and further comprising a second mounting mechanism (7) and a limiting mechanism (8), wherein the second mounting mechanism (7) is used to mount the double-headed swing arm (5) on the surface of the rotating shaft of the pneumatic actuator (2), and wherein the limiting mechanism (8) is used to limit the plurality of rolling tubes (6) respectively above the double-headed swing arm (5).

2. A limit switch according to claim 1, characterized in that: The first mounting mechanism (3) comprises a flange (301) fixedly sleeved on the surface of the valve (1), a plurality of mounting bolts (302) being threadedly inserted into the surface of the flange (301), and the surfaces of the plurality of mounting bolts (302) being threadedly inserted into the surface of the pneumatic actuator (2).

3. A limit switch according to claim 1, characterized in that: The second mounting mechanism (7) comprises a mounting head (701) arranged at one end of the rotating shaft of the pneumatic actuator (2); the double-headed swing arm (5) is slidably sleeved on the surface of the mounting head (701); an insertion rod (702) is fixedly mounted on the surface of the mounting head (701); the insertion rod (702) is slidably sleeved on the surface of the double-headed swing arm (5) and a mounting sleeve (703) is threadedly sleeved on the surface.

4. A limit switch according to claim 1, characterized in that: The limiting mechanism (8) comprises two limiting rods (801) which are both slidably inserted into the surface of the double-headed swing arm (5); a plurality of rolling tubes (6) are respectively rotatably sleeved on the surfaces of the two limiting rods (801); and the surfaces of the two limiting rods (801) are both threadedly sleeved with limiting sleeves (802).

5. A limit switch according to claim 1, characterized in that: An inclined rod (9) is fixedly mounted on the surface of the double-headed swing arm (5).

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