Electric actuator for anti-explosion valve

Abstract

The utility model relates to the technical field of industrial automation of valves, and discloses an electric actuator for an explosion-proof valve, which comprises a box body, a junction box is arranged at the top of the box body, a cover is fixedly arranged on the left side of the box body, and a motor assembly is arranged on the rear side of the box body. A worm assembly, a torque transmission assembly, a stroke transmission assembly and an output shaft are installed in the box body, and a manual shell assembly is installed on the front side of the box body. When the valve is opened and closed in place, due to the fact that the power of the motor is large, the worm sleeve can slide in the axis direction of the rotating shaft, the groove in the worm sleeve can make contact with the round needle, the bearing frame rotates, the contact on the top of the bearing frame can make contact with the torque switch, the motor can be powered off, and the valve is prevented from being damaged by extrusion; the trigger teeth adjust the contact piece of the travel switch to the position of the microswitch, and when the motor rotates forwards or reversely in place, the contact piece of the travel switch can abut against the microswitch, and power-off stopping is achieved.

Description

Technical Field

[0001] This utility model relates to the field of valve industry automation technology, and more specifically to an electric actuator for explosion-proof valves. Background Technology

[0002] Valve industrial automation refers to the technology of controlling valves using methods other than human power, such as electric, pneumatic, and electromagnetic drives. It has a wide range of applications in many industrial fields.

[0003] Currently, many valves are equipped with both electric and manual operating modes. When there is a power outage, they can be switched to manual mode. However, because the handwheel and worm gear are directly connected, the manual / electric switching mechanism is prone to failure and is bulky. In addition, existing valves lack a stable and reliable power failure protection design, which leads to certain risks during valve use. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an electric actuator for explosion-proof valves to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: an electric actuator for explosion-proof valves, including a housing, a junction box installed on the top of the housing, a cover fixedly installed on the left side of the housing, a motor assembly installed on the rear side of the housing, a worm gear assembly, a torque transmission assembly, a stroke transmission assembly and an output shaft installed inside the housing, and a manual housing assembly installed on the front side of the housing.

[0006] Preferably, the motor assembly includes a motor, which is fixedly installed on the rear side of the housing, with the motor output end extending into the housing and a motor gear fixedly connected to the motor output end.

[0007] Preferably, the worm gear assembly includes a rotating shaft and a worm wheel. Both the rotating shaft and the output shaft are rotatably mounted inside the housing. A transmission gear is fixedly connected to the surface of the rotating shaft, and the transmission gear meshes with a motor gear. A worm sleeve is provided on the surface of the rotating shaft, and the worm sleeve is connected to the rotating shaft via a spline. The worm sleeve can slide along the axis of the rotating shaft. The worm wheel is fixedly mounted on the surface of the output shaft, and the worm sleeve meshes with the worm wheel. The output shaft is fixedly connected to the three-jaw chuck of the explosion-proof valve.

[0008] Preferably, the stroke transmission assembly includes a transmission rod and a limit switch. The limit switch is provided with a contact and a micro switch. The transmission rod is rotatably mounted inside the housing, and the limit switch is fixedly mounted inside the housing. A first bevel gear is fixedly connected to the surface of the output shaft, and a second bevel gear is fixedly connected to the surface of the transmission rod. The first bevel gear and the second bevel gear are meshed together. A trigger tooth is also fixedly connected to the surface of the transmission rod, and the trigger tooth is used to adjust the position of the limit switch contact.

[0009] Preferably, the torque transmission assembly includes a receiving frame and a torque switch. The receiving frame is rotatably installed inside the housing, and the torque switch is fixedly installed inside the housing. A round needle is fixedly connected to the receiving frame, and a contact is provided on the top of the receiving frame. A groove is provided on the worm gear sleeve, and the round needle matches the groove.

[0010] Preferably, the manual housing assembly includes a mounting housing, which is fixedly mounted on the front side of the housing. A pull ring lock is provided on one side of the mounting housing. A manual shaft is rotatably mounted inside the mounting housing. A handwheel is fixedly connected to the surface of the manual shaft. A positioning groove is provided on the surface of the manual shaft, which matches the pull ring lock. A four-jaw jack is fixedly mounted on one end of the manual shaft. A worm pin is provided on the rotating shaft, and the four-jaw jack matches the worm pin. A pin is also provided at one end of the manual shaft.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] 1. When the valve is fully open or closed, the high power of the motor causes the worm gear sleeve to slide along the axis of rotation. During this process, the groove on the worm gear sleeve will touch the round needle on the receiving frame, causing the receiving frame to rotate. The contact at the top of the receiving frame will touch the torque switch, which will cut off the power to the motor and prevent the valve from being damaged. In addition, when the valve is fully open or fully closed, the trigger tooth will adjust the contact of the limit switch to the micro switch position. When the motor rotates forward or reverse to the correct position, the contact of the limit switch will push against the micro switch on the limit switch to achieve power cut-off and stop, ensuring safe and stable operation.

[0013] 2. In the event of a power outage, when the valve needs to be opened or closed, the operator can manually push the handwheel. The pull ring lock will drop and lock the positioning groove of the manual shaft. The four claws of the manual shaft will then engage the worm pin on the rotating shaft. At the same time, the ejector pin will push forward and push the micro switch, ensuring that the actuator is de-energized. The operator can then safely crank the handwheel to rotate the output shaft for manual operation. After the power is restored, the pull ring lock can be pulled out to restore power to the actuator. This design effectively prevents the motor from rotating and injuring people by driving the manual shaft and handwheel in the event of a sudden power outage. Attached Figure Description

[0014] Figure 1This is a front sectional view of the present invention.

[0015] Figure 2 This is a top sectional view of the present invention.

[0016] Figure 3 This is a side view of the present invention.

[0017] Figure 4 This utility model Figure 2 Enlarged view of the structure at point A in the image.

[0018] Figure 5 This is a diagram showing the assembly of the output shaft and the transmission rod of this utility model.

[0019] Figure 6 This is a schematic diagram of the worm gear assembly structure of this utility model.

[0020] The attached diagram is labeled as follows: 1. Housing; 2. Cover; 3. Junction box; 4. Output shaft; 5. Stroke transmission assembly; 51. Transmission rod; 52. Limit switch; 53. First bevel gear; 54. Second bevel gear; 55. Trigger tooth; 6. Motor assembly; 61. Motor; 62. Motor gear; 7. Worm gear assembly; 71. Rotating shaft; 72. Worm wheel; 73. Transmission gear; 74. Worm sleeve; 8. Torque transmission assembly; 81. Support frame; 82. Torque switch; 83. Round needle; 84. Groove; 9. Manual housing assembly; 91. Mounting housing; 92. Pull ring lock; 93. Manual shaft; 94. Handwheel; 95. Four-jaw jack; 96. Worm pin; 97. Ejector pin. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The electric actuator for explosion-proof valves involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] This utility model provides an electric actuator for explosion-proof valves, including a housing 1, a junction box 3 installed on the top of the housing 1, a cover 2 fixedly installed on the left side of the housing 1, a motor assembly 6 installed on the rear side of the housing 1, a worm gear assembly 7, a torque transmission assembly 8, a stroke transmission assembly 5 and an output shaft 4 installed inside the housing 1, and a manual housing assembly 9 installed on the front side of the housing 1.

[0023] Furthermore, the motor assembly 6 includes a motor 61, which is fixedly installed on the rear side of the housing 1. The output end of the motor 61 extends into the interior of the housing 1, and a motor gear 62 is fixedly connected to the output end of the motor 61.

[0024] Furthermore, the worm gear assembly 7 includes a rotating shaft 71 and a worm wheel 72. Both the rotating shaft 71 and the output shaft 4 are rotatably mounted inside the housing 1. A transmission gear 73 is fixedly connected to the surface of the rotating shaft 71, and the transmission gear 73 meshes with the motor gear 62. A worm sleeve 74 is provided on the surface of the rotating shaft 71, and the worm sleeve 74 is connected to the rotating shaft 71 via a spline. The worm sleeve 74 can slide along the axial direction of the rotating shaft 71. The worm wheel 72 is fixedly mounted on the surface of the output shaft 4, and the worm sleeve 74 meshes with the worm wheel 72. The output shaft 4 is fixedly connected to the three-jaw chuck of the explosion-proof valve. The motor gear 62 and the transmission gear 73 cooperate to convert the output power of the motor 61 into the rotational force of the rotating shaft 71. While the rotating shaft 71 rotates, it can drive the worm sleeve 74 to rotate synchronously around the axis of the rotating shaft 71. The rotation of the worm sleeve 74 drives the output shaft 4 to rotate synchronously around its own axis through the worm wheel 72. The rotation of the output shaft 4 drives the three-jaw chuck of the explosion-proof valve to rotate synchronously. While the three-jaw chuck rotates, it drives the valve screw to move up and down, thus realizing the opening and closing of the valve.

[0025] Furthermore, the stroke transmission assembly 5 includes a transmission rod 51 and a limit switch 52. The limit switch 52 is provided with a contact piece and a micro switch. The transmission rod 51 is rotatably mounted inside the housing 1, and the limit switch 52 is fixedly mounted inside the housing 1. A first bevel gear 53 is fixedly connected to the surface of the output shaft 4, and a second bevel gear 54 is fixedly connected to the surface of the transmission rod 51. The first bevel gear 53 and the second bevel gear 54 are meshed together. A trigger tooth 55 is also fixedly connected to the surface of the transmission rod 51. The trigger tooth 55 is used to adjust the position of the contact piece of the limit switch 52.

[0026] Furthermore, the torque transmission assembly 8 includes a support frame 81 and a torque switch 82. The support frame 81 is rotatably mounted inside the housing 1, and the torque switch 82 is fixedly mounted inside the housing 1. A round needle 83 is fixedly connected to the support frame 81, and a contact is provided on the top of the support frame 81. A groove 84 is provided on the worm sleeve 74, and the round needle 83 matches the groove 84.

[0027] Furthermore, the manual housing assembly 9 includes a mounting housing 91, which is fixedly mounted on the front side of the housing 1. A pull ring lock 92 is provided on one side of the mounting housing 91. A manual shaft 93 is rotatably mounted inside the mounting housing 91. A handwheel 94 is fixedly connected to the surface of the manual shaft 93. A positioning groove is provided on the surface of the manual shaft 93, which matches the pull ring lock 92. A four-jaw 95 is fixedly mounted on one end of the manual shaft 93. A worm pin 96 is provided on the rotating shaft 71. The four-jaw 95 matches the worm pin 96. A pin 97 is also provided on one end of the manual shaft 93.

[0028] In use, when the power is off and the valve needs to be opened or closed, the operator manually pushes the handwheel 94. The pull ring lock 92 falls and locks the positioning groove of the manual shaft 93. The four claws 95 of the manual shaft 93 then engage the worm pin 96 on the rotating shaft 71. At the same time, the ejector pin 97 pushes in to push the micro switch, ensuring that the actuator is de-energized. Otherwise, if the power is suddenly restored, the motor 61 will rotate, which could drive the manual shaft 93 and the handwheel 94 and injure a person. After ensuring that the actuator is de-energized, the handwheel 94 can be safely cranked. The handwheel 94 drives the output shaft 4, which is consistent with the electric working principle. When the power is restored, the pull ring lock 92 is pulled out, the handwheel 94 automatically pops out, the ejector pin 97 disengages from the micro switch, and the actuator is energized.

[0029] The working principle of this utility model is as follows: When the three-phase power supply is turned on in the junction box 3, the motor 61 drives the rotating shaft 71 to rotate around its own axis through the motor gear 62 and the transmission gear 73. The rotating shaft 71 rotates and drives the worm sleeve 74 to rotate synchronously around the axis of the rotating shaft 71. The rotating worm sleeve 74 rotates and drives the output shaft 4 to rotate synchronously around its own axis through the worm wheel 72. The rotation of the output shaft 4 drives the three claws of the explosion-proof valve to rotate synchronously. While the three claws rotate, they drive the valve screw to move up and down, thus realizing the opening and closing of the valve.

[0030] When the valve is opened or closed, the high power of the motor 61 will cause the worm sleeve 74 to slide along the axis of the rotating shaft 71. During this process, the groove 84 on the worm sleeve 74 will touch the round needle 83 on the receiving frame 81, causing the receiving frame 81 to rotate. The contact at the top of the receiving frame 81 will touch the torque switch 82, which will cut off the power to the motor 61 and prevent the valve from being damaged.

[0031] While the output shaft 4 rotates, it drives the transmission rod 51 to rotate around its own axis through the first bevel gear 53 and the second bevel gear 54. The rotation of the transmission rod 51 drives the trigger tooth 55 to rotate synchronously. When the valve is fully open or fully closed, the trigger tooth 55 adjusts the contact of the limit switch 52 to the micro switch position. When the motor 61 rotates forward or reverse to the position, the contact of the limit switch 52 will push against the micro switch on the limit switch 52 to achieve power-off stop.

[0032] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0033] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0034] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric actuator for explosion-proof valves, comprising a housing (1), characterized in that, A junction box (3) is installed on the top of the housing (1), a cover (2) is fixedly installed on the left side of the housing (1), a motor assembly (6) is installed on the rear side of the housing (1), a worm gear assembly (7), a torque transmission assembly (8), a stroke transmission assembly (5) and an output shaft (4) are installed inside the housing (1), and a manual housing assembly (9) is installed on the front side of the housing (1). The motor assembly (6) includes a motor (61), which is fixedly installed on the rear side of the housing (1). The output end of the motor (61) extends into the interior of the housing (1), and a motor gear (62) is fixedly connected to the output end of the motor (61). The worm gear assembly (7) includes a rotating shaft (71) and a worm wheel (72). The rotating shaft (71) and the output shaft (4) are rotatably mounted inside the housing (1). A transmission gear (73) is fixedly connected to the surface of the rotating shaft (71). The transmission gear (73) meshes with the motor gear (62). A worm sleeve (74) is provided on the surface of the rotating shaft (71). The worm sleeve (74) is connected to the rotating shaft (71) by a spline, and the worm sleeve (74) can slide along the axis of the rotating shaft (71). The worm wheel (72) is fixedly mounted on the surface of the output shaft (4). The worm sleeve (74) meshes with the worm wheel (72). The output shaft (4) is fixedly connected to the three-jaw jack of the explosion-proof valve. The stroke transmission assembly (5) includes a central transmission rod (51) and a limit switch (52). The limit switch (52) is provided with a contact piece and a micro switch. The central transmission rod (51) is rotatably installed inside the housing (1). The limit switch (52) is fixedly installed inside the housing (1). A first bevel gear (53) is fixedly connected to the surface of the output shaft (4). A second bevel gear (54) is fixedly connected to the surface of the central transmission rod. The first bevel gear (53) and the second bevel gear (54) are meshed together. A trigger tooth (55) is also fixedly connected to the surface of the central transmission rod (51). The trigger tooth (55) is used to adjust the position of the contact piece of the limit switch (52). The torque transmission assembly (8) includes a support frame (81) and a torque switch (82). The support frame (81) is rotatably installed inside the housing (1), and the torque switch (82) is fixedly installed inside the housing (1). A round needle (83) is fixedly connected to the support frame (81). A contact is provided on the top of the support frame. A groove (84) is provided on the worm gear sleeve. The round needle (83) matches the groove (84). The manual housing assembly (9) includes a mounting housing (91), which is fixedly installed on the front side of the housing (1). A pull ring lock (92) is provided on one side of the mounting housing (91). A manual shaft (93) is rotatably installed inside the mounting housing (91). A handwheel (94) is fixedly connected to the surface of the manual shaft (93). A positioning groove is provided on the surface of the manual shaft (93), which matches the pull ring lock (92). A four-jaw jack (95) is fixedly installed at one end of the manual shaft (93). A worm pin (96) is provided on the rotating shaft. The four-jaw jack (95) matches the worm pin (96). A pin (97) is also provided at one end of the manual shaft.

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