Pneumatic pushing mechanism of high-temperature powder stop valve

Abstract

The utility model discloses a pneumatic pushing mechanism for a high-temperature powder cut-off valve, which belongs to the technical field of high-temperature powder cut-off valves and is characterized in that a gear and rack transmission component is in transmission connection with a valve rod of a cut-off valve body; the actuator installation auxiliary mechanism is in transmission connection with the gear and rack transmission assembly, and the actuator installation auxiliary mechanism drives the gear and rack transmission assembly to drive the valve rod to rotate. The pneumatic actuator installed on the actuator auxiliary mechanism is controlled to drive the gear and rack transmission assembly to control closing and opening of the valve, the rack is in meshing transmission with one side of the gear, the transmission mode is simple in structure, large in transmission power and small in transmission loss, stable rotation of a valve rod can be ensured, reliable opening and closing of the valve are achieved, and the service life of the valve is prolonged. The pneumatic actuator is far away from a high-temperature heat source due to the connecting mode of the mounting support and the stop valve body and the use of the heat insulation gasket, and faults such as sealing leakage caused by heat radiation are reduced.

Description

Technical Field

[0001] The utility model relates to the field of high-temperature powder cut-off valves, in particular to a pneumatic driving mechanism of a high-temperature powder cut-off valve. Background Art

[0002] In the chemical industry, particularly lithium carbonate production, material grinding is a crucial step in the ore extraction process. This process involves conveying large quantities of material. These materials are characterized by high temperatures (reaching 800°C or above), are in powder or granular form, and are often accompanied by high-frequency vibrations during conveyance to prevent adhesion. This powder conveying process inevitably requires the use of specialized shut-off valves.

[0003] Conventional actuators for shut-off valves present several challenges in high-temperature environments. For example, some actuators are connected directly to the valve stem or via a coupling. When operating with high-temperature media, conventional actuators are too close to the heat source. Intense heat radiation and conduction can quickly cause the actuator seal to leak or components to age and become damaged. This can lead to actuator failure or insufficient thrust, preventing the valve from opening or closing. Furthermore, when the actuator is connected to the valve via a coupling or fixed block, errors can occur due to the actuator's inability to recognize the entity. Furthermore, when the actuator is connected to the valve via a coupling or fixed block, there's a risk of the valve stem becoming loose or falling out due to loose attachment or wear. While the actuator may function normally, the valve is not actually driven to the correct position as instructed. The position switch attached to the actuator then provides feedback signals that are not true of the valve position, disrupting production processes and even causing serious accidents. A pneumatic actuator for a high-temperature powder shut-off valve that improves these issues has become a pressing issue for those skilled in the art. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a pneumatic driving mechanism for a high-temperature powder shut-off valve, which aims to improve the situation where the conventional actuator is too close to the high-temperature heat source, and the strong heat radiation and heat conduction cause the actuator seal to leak in a short period of time or the components to be damaged by high-temperature aging, resulting in actuator failure or insufficient thrust, and the valve cannot be opened or closed.

[0005] The utility model is realized as follows: a pneumatic driving mechanism of a high-temperature powder cut-off valve, comprising

[0006] A rack and pinion transmission assembly, the rack and pinion transmission assembly being mounted on the shut-off valve body and being in driving connection with the valve stem of the shut-off valve body;

[0007] An actuator installation auxiliary mechanism is connected to the rack and pinion transmission assembly in a transmission manner, and the actuator installation auxiliary mechanism drives the rack and pinion transmission assembly to drive the valve stem to rotate.

[0008] In a preferred technical solution of the present invention, the rack and pinion transmission assembly includes a gear, the gear is fixedly sleeved on the valve stem, and a rack is provided on one side of the gear for meshing transmission.

[0009] In a preferred technical solution of the present invention, a guide rail is provided above the rack, a slider is sleeved on the outer limit sliding sleeve of the guide rail, and the slider is fixedly connected to the top of the rack.

[0010] In a preferred technical solution of the present invention, the guide rail is fixedly mounted on the shut-off valve body, and a grease injection port is provided on one side of the slider.

[0011] In a preferred technical solution of the present invention, a valve indicating mechanism is fixedly mounted on one side of the gear, and a first valve position feedback switch and a second valve position feedback switch are provided at corresponding positions of the valve indicating mechanism.

[0012] In a preferred technical solution of the present invention, the angle between the first valve position feedback switch and the second valve position feedback switch is 90 degrees.

[0013] In a preferred technical solution of the present invention, the actuator installation auxiliary mechanism includes a pneumatic actuator, which is installed on one side of the shut-off valve body, and the output end of the pneumatic actuator is transmission-connected to the rack.

[0014] In a preferred technical solution of the present invention, one end of the rack is limitedly connected to a rack locking piece, and the tail of the rack locking piece is limitedly connected to the output end of the pneumatic actuator.

[0015] In a preferred technical solution of the present invention, a rack adjusting member is sleeved on the upper limit position of the output end of the pneumatic actuator, and the rack adjusting member is in limiting contact with the rack locking member.

[0016] In a preferred technical solution of the present invention, an actuator mounting bracket is fixedly mounted on one side of the pneumatic actuator, and one end of the actuator mounting bracket is fixedly mounted on the shut-off valve body.

[0017] The beneficial effects of the present invention are as follows: The pneumatic driving mechanism for a high-temperature powder shut-off valve obtained by the above-mentioned design has the following advantages: When in use, the gear of the rack-and-pinion transmission assembly is fixedly sleeved on the valve stem, and the rack meshes with one side of the gear for transmission. This transmission method has a simple structure, high transmission power, and low transmission loss, ensuring stable rotation of the valve stem and reliable opening and closing of the valve. At the same time, the guide rail and slider limit and guide the rack, ensuring the accurate motion trajectory of the rack, further improving the reliability of the transmission.

[0018] The connection method between the mounting bracket and the shut-off valve body and the use of thermal insulation gaskets keep the pneumatic actuator away from high-temperature heat sources, reducing failures such as seal leakage caused by thermal radiation, increasing the service life of components, and effectively protecting the actuator from high temperature effects.

[0019] A valve indicating mechanism is fixedly installed on one side of the gear, and a first valve position feedback switch and a second valve position feedback switch are provided at the corresponding positions. The angle between the first valve position feedback switch and the second valve position feedback switch is 90 degrees, which is the angle between the fully open and fully closed positions of the valve. Therefore, the valve position feedback switch can accurately indicate the fully open and fully closed positions of the valve, providing the operator with accurate valve position information to avoid misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the structure of one side of the structure provided by the embodiment of the present utility model;

[0022] Figure 2 A schematic diagram of a three-dimensional structure provided for an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the back structure provided by an embodiment of the present utility model.

[0024] In the figure: 10- rack and pinion transmission assembly; 101- rack; 102- gear; 103- guide rail; 104- slider; 105- valve indicating mechanism; 106- first valve position feedback switch; 107- second valve position feedback switch; 108- grease injection port; 20- actuator mounting auxiliary mechanism; 201- actuator mounting bracket; 202- pneumatic actuator; 203- rack adjustment member; 204- rack locking member. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, 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 are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1 to 3 The utility model provides a technical solution: a pneumatic driving mechanism for a high-temperature powder cut-off valve, comprising

[0027] The rack and pinion transmission assembly 10 is installed on the shut-off valve body, and the rack and pinion transmission assembly 10 is transmission-connected to the valve stem of the shut-off valve body; the actuator installation auxiliary mechanism 20, the actuator installation auxiliary mechanism 20 is transmission-connected to the rack and pinion transmission assembly 10, and the actuator installation auxiliary mechanism 20 drives the rack and pinion transmission assembly 10 to drive the valve stem to rotate, and the rack and pinion transmission assembly 10 is driven by controlling the actuator installation auxiliary mechanism 20 to control the closing and opening of the valve.

[0028] The rack and pinion assembly 10 includes a gear 102, which is fixedly mounted on the valve stem. A rack 101 is meshed with one side of the gear 102. A guide rail 103 is positioned above the rack 101. A slider 104 is slidably mounted on the outer portion of the guide rail 103. The slider 104 is fixedly connected to the top of the rack 101. The slider 104 and guide rail 103 limit the trajectory of the rack 101, allowing it to move linearly. The guide rail 103 is fixedly mounted on the shut-off valve body. A grease inlet 108 is located on one side of the slider 104 to enhance its smoothness.

[0029] A valve indicator mechanism 105 is fixedly mounted on one side of the gear 102. A first valve position feedback switch 106 and a second valve position feedback switch 107 are located correspondingly to the valve indicator mechanism 105. The angle between the first and second valve position feedback switches 106 and 107 is 90 degrees. These switches are used to detect the opening and closing of the valve, respectively, providing accurate valve position signals at the 0° and 90° positions without mechanical contact.

[0030] The rack and pinion transmission assembly 10 has a large transmission torque and can operate a heavy-duty shut-off valve. Since the gear 102 and the rack 101 have a small transmission stroke, the valve opening and closing action cycle is short.

[0031] The actuator mounting auxiliary mechanism 20 includes a pneumatic actuator 202, which is mounted on one side of the shut-off valve body. The output end of the pneumatic actuator 202 is drivingly connected to the rack 101. One end of the rack 101 is captive-connected to a rack locking member 204, the rear end of which is captive-connected to the output end of the pneumatic actuator 202.

[0032] The output end of the pneumatic actuator 202 is fitted with a rack adjustment member 203, which is in contact with a rack locking member 204. One end of the rack locking member 204 is U-shaped, with one end of the rack 101 secured within the U. The other end of the rack locking member 204 is a threaded barrel that is threadedly fitted onto the output end of the pneumatic actuator 202. The output end of the pneumatic actuator 202 is threadedly fitted with the rack adjustment member 203, which abuts against the barrel of the rack locking member 204. The position of the rack locking member 204 is limited by turning the rack adjustment member 203, and the position of the rack 101 is changed by rotating the rack locking member 204. An actuator mounting bracket 201 is fixedly installed on one side of the pneumatic actuator 202. One end of the actuator mounting bracket 201 is fixedly installed on the valve body of the shut-off valve. The actuator mounting bracket 201 is increased in distance from the shut-off valve to prevent the high temperature of the valve body from affecting the normal operation and service life of the actuator. It is set in a triangle. The actuator mounting bracket 201 and the valve body are isolated by a non-metallic gasket material with high temperature resistance and low thermal conductivity to reduce heat transfer.

[0033] The actuator mounting bracket 201 is cut from a whole piece of steel plate and then bent. It has extremely high strength and rigidity, and can withstand the reverse thrust generated when the actuator is in motion and the weight of the long-term load actuator without deformation. The actuator mounting auxiliary mechanism 20 is provided with multiple sets of standard holes for connecting to the actuator, which can be matched with the installation of most brands of actuators on the market. The mounting holes connecting the bracket and the actuator are fixed with non-metallic insulation gaskets, which can further isolate and reduce heat conduction.

[0034] Working principle: transmission principle

[0035] When pneumatic actuator 202 is operating, its output pushes rack 101. Rack 101, constrained and guided by guide rail 103 and slider 104, moves linearly along guide rail 103. Because rack 101 meshes with gear 102, its linear motion rotates gear 102, which is fixedly mounted on the valve stem. This rotation drives the valve stem, opening and closing the valve.

[0036] Valve position indication principle

[0037] When the valve rotates, the valve indicator mechanism 105 on one side of the gear 102 rotates accordingly. When the valve is in the fully open or fully closed position, the valve indicator mechanism 105 faces the first valve position feedback switch 106 and the second valve position feedback switch 107, respectively. By feeding back signals from the first and second valve position feedback switches 106 and 107, the valve position is accurately indicated.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pneumatic driving mechanism for a high-temperature powder shut-off valve, characterized in that: include A rack and pinion transmission assembly, the rack and pinion transmission assembly being mounted on the shut-off valve body and being in driving connection with the valve stem of the shut-off valve body; An actuator installation auxiliary mechanism, the actuator installation auxiliary mechanism is in transmission connection with the rack and pinion transmission assembly, and the actuator installation auxiliary mechanism drives the rack and pinion transmission assembly to drive the valve stem to rotate; The rack and pinion transmission assembly includes a gear, which is fixedly sleeved on the valve stem, and a rack is provided on one side of the gear for meshing transmission; a guide rail is provided above the rack, and a slider is slidably sleeved on the outer limit of the guide rail, and the slider is fixedly connected to the top of the rack; The actuator installation auxiliary mechanism includes a pneumatic actuator, which is installed on one side of the shut-off valve body, and the output end of the pneumatic actuator is connected to the rack transmission; An actuator mounting bracket is fixedly mounted on one side of the pneumatic actuator, and one end of the actuator mounting bracket is fixedly mounted on the shut-off valve body.

2. A pneumatic driving mechanism for a high-temperature powder shut-off valve according to claim 1, characterized in that: The guide rail is fixedly mounted on the shut-off valve body, and a grease injection port is provided on one side of the slider.

3. The pneumatic driving mechanism for a high-temperature powder shut-off valve according to claim 1, characterized in that: A valve indicating mechanism is fixedly mounted on one side of the gear, and a first valve position feedback switch and a second valve position feedback switch are provided at corresponding positions of the valve indicating mechanism.

4. A pneumatic driving mechanism for a high-temperature powder shut-off valve according to claim 3, characterized in that: The included angle between the first valve position feedback switch and the second valve position feedback switch is 90 degrees.

5. The pneumatic driving mechanism for a high-temperature powder shut-off valve according to claim 1, characterized in that: One end of the rack is limitedly connected to a rack locking piece, and the tail of the rack locking piece is limitedly connected to the output end of the pneumatic actuator.

6. The pneumatic driving mechanism for a high-temperature powder shut-off valve according to claim 5, characterized in that: The upper limit sleeve of the output end of the pneumatic actuator is connected with a rack adjustment member, and the rack adjustment member is in limiting contact with the rack locking member.

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