A high-precision electric head control box based on lead screw control

Abstract

The invention discloses a high-precision electric head control box based on screw control, which relates to the technical field of electric head control boxes, including a valve body and a mechanical control box installed on the valve body, wherein a screw control assembly is arranged in the mechanical control box, and the screw control assembly comprises a stroke input shaft, a spindle screw, a stroke switch slider, an opening stroke microswitch and a closing stroke microswitch, the stroke input shaft is rotatably connected to the valve body, one end of the stroke input shaft is used for connecting the power input of the electric actuator, and the other end is transmission-connected to the spindle screw, a stroke switch slider is threadedly sleeved on the spindle screw, the opening stroke microswitch and the closing stroke microswitch are arranged at intervals along the axial direction of the spindle screw, and the installation positions of the opening stroke microswitch and the closing stroke microswitch can be adjusted along the axial direction of the spindle screw, the stroke switch slider is used for single triggering of the opening stroke microswitch or the closing stroke microswitch, has high transmission accuracy, and can be suitable for scenes with high speed, high sensitivity and rigidity.

Description

Technical Field

[0001] The invention relates to the technical field of electric head control boxes, and in particular to a high-precision electric head control box based on lead screw control. Background Art

[0002] The electric head control box is mainly used to control the switch status of the valve and feedback the valve switch status information. The electric head control box is used in conjunction with the electric actuator. The power is transmitted through the electric actuator. The electric actuator inputs power to control the opening and closing of the valve, and the electric head control box feedbacks the switch status of the valve. At present, the Russian-supplied switch type electric head control box is basically used on the market. The travel switch control method of the traditional Russian-supplied switch type electric head control box is: the coaxial attached gear on the worm shaft in the electric head control box box drives the travel matching wheel to rotate after passing through several levels of transmission teeth. The travel matching wheel is connected to the travel transmission shaft inside the electric head control box through the shaft. The travel transmission shaft drives the gear on the travel torque main shaft to rotate through the attached worm gear thereon, so that the travel torque main shaft rotates coaxially. The main shaft is equipped with a main travel switch and a spare travel switch. There is a main travel gear on the travel transmission shaft, which drives the adjacent travel sub-gear through the meshing between the gears. The compression force of the compression spring on the upper part of the travel sub-gear is used to make the main travel switch generate a downward pressure on the travel switch groove corresponding to the running direction of the electric actuator. As the travel switch groove rotates, when the lever of the main travel switch is pressed into the groove, the corresponding travel micro switch is pressed down and the switch signal is transmitted. The main travel mechanism is also called a travel quick action device. If a spare stroke switch is used, the cam of the spare stroke switch rotates with the main shaft until it presses the spare stroke micro switch, cutting off the motor, and the valve switch is in place, while transmitting the switch signal, and the torque switch only plays a protective role. It can be seen from this that the traditional Russian-supplied switch-type electric head control box uses the two grooves distributed along the same circumference of the lever to press or release the stroke micro switch. Therefore, the basic principle of stroke adjustment is to adjust the angle between the two grooves to adapt to the actual stroke of the valve. Because they are on the same circumference, there are problems such as limited adjustment range (angle), low control accuracy, and difficulty in adjusting the torque range. It is not suitable for some use scenarios with high precision requirements, such as: control of valves in nuclear power plants. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a high-precision electric head control box based on lead screw control to solve the deficiencies of the prior art.

[0004] The objective of the present invention is achieved through the following technical solutions: a high-precision electric head control box based on screw control, used to connect the switching signal of the electric actuator feedback valve, including a valve body and a mechanical control box installed on the valve body, a screw control assembly is arranged in the mechanical control box, and the screw control assembly includes a stroke input shaft, a spindle screw, a stroke switch slider, an open stroke microswitch and a close stroke microswitch, the stroke input shaft is rotatably connected to the valve body, one end of the stroke input shaft is used to connect the power input of the electric actuator, and the other end is transmission connected to the spindle screw, the spindle screw is threaded with a stroke switch slider, the open stroke microswitch and the close stroke microswitch are arranged at intervals along the axial direction of the spindle screw, and the installation position of the open stroke microswitch and the installation position of the close stroke microswitch can be adjusted along the axial direction of the spindle screw, and the stroke switch slider is used to trigger the open stroke microswitch or the close stroke microswitch alone.

[0005] Furthermore, the screw control assembly also includes a left support plate, a right support plate and a spindle screw fixed shaft, the left support plate and the right support plate are both mounted on the valve body by screws, the spindle screw is rotatably mounted on the left support plate and the right support plate, the two ends of the spindle screw fixed shaft are respectively fixedly connected to the left support plate and the right support plate, and the travel switch slider is slidably mounted on the spindle screw fixed shaft.

[0006] Furthermore, two sets of slide rails are fixed between the left support plate and the right support plate, and slide rail sliders are adapted to slide on the slide rails. The slide rail sliders are fastened to the slide rails by screws, and the open stroke micro switch and the close stroke micro switch are respectively installed on the slide rail sliders of the two sets of slide rails.

[0007] Furthermore, a travel control plate is connected to the top of the travel switch slider, and two groups of travel trigger components are arranged on the travel control plate. The travel trigger components include a connecting rod and a roller, one end of the connecting rod is connected to the travel control plate, and the other end is rotatably connected to the roller, the contact at the top of the open travel micro switch is located on the moving path of one of the rollers, and the contact at the top of the closed travel micro switch is located on the moving path of the other roller.

[0008] Furthermore, a stroke input bevel gear is mounted on the stroke input shaft, a screw input bevel gear is mounted on the main shaft screw, the screw input bevel gear meshes with the stroke input bevel gear, and one end of the stroke input shaft passes through the bottom of the valve body and is connected to a stroke mating wheel.

[0009] Furthermore, one end of the spindle screw away from the stroke input shaft is connected to the dial gear shaft through a large-proportional speed reduction component, and a dial pointer is fixed to one end of the dial gear shaft close to the inner wall of the mechanical control box. A transparent dial cover is provided on the side wall of the mechanical control box, and the transparent dial cover is marked with scales along its own circumferential direction. The transparent dial cover is used to display the dial pointer.

[0010] Furthermore, the large-proportion speed reduction component includes a rotatably arranged groove wheel shaft and a driving plate mounted on the main shaft screw, a driving shaft is eccentrically fixed on the driving plate, a groove wheel is mounted on the groove wheel shaft, a plurality of arc grooves are evenly distributed on the side wall of the groove wheel along its circumferential direction, the driving shaft is used to act in the arc groove to drive the groove wheel to deflect, a dial gear is mounted on the dial gear shaft, a groove wheel shaft gear is mounted on the groove wheel shaft, and the groove wheel shaft gear meshes with the dial gear.

[0011] Furthermore, a torque control component is also provided in the mechanical control box, and the torque control component includes a torque input gear shaft, a torque control lead screw and two groups of symmetrically arranged torque switch components, the torque input gear shaft and the torque control lead screw are both rotatably arranged, the torque input gear shaft is connected to the torque control lead screw through a gear set transmission, the torque switch component includes a torque micro switch and a torque lead screw slider, the torque lead screw slider is threadedly mounted on the torque control lead screw, and the torque lead screw slider is used to trigger the torque micro switch.

[0012] Furthermore, the torque control assembly also includes a fixed torque screw fixed shaft and a switch installation shaft, the torque screw slider is slidably mounted on the torque screw fixed shaft, and the torque micro switch is mounted on the switch installation shaft.

[0013] Further, the torque switch assembly also includes a double-control switch. When the torque lead screw slider triggers the double-control switch, the double-control switch triggers the torque micro-switch. The double-control switch includes a switch housing, a trigger rod and a 7-shaped mounting rod. One end of the 7-shaped mounting rod is fixedly mounted on the switch mounting shaft. The trigger rod is vertically arranged and slidably connected to the 7-shaped mounting rod. The switch housing is slidably sleeved on the trigger rod. The bottom of the trigger rod has an arc transition and is located on the moving path of the torque lead screw slider. The contact of the torque micro-switch is located on the moving path of the switch housing.

[0014] When the travel switch slider triggers the contact of the open-travel microswitch, the travel switch slider presses down one of the double-control switches, so that the double-control switch acts on the contact of the corresponding torque microswitch;

[0015] When the travel switch slider triggers the contact of the off-travel microswitch, the travel switch slider presses down the other double-control switch, so that the double-control switch acts on the contact of the corresponding torque microswitch.

[0016] Furthermore, the switch housing comprises an upper housing, a switch body and a switch control disk, the two ends of the switch body are respectively connected to the upper housing and the switch control disk, the contact of the torque micro switch is located on the moving path of the switch control disk, a switch shaft is arranged in the switch housing, the switch shaft movably passes through the trigger rod to connect the 7-shaped mounting rod, a hollow inverted truncated table is fixed on the top of the trigger rod, a truncated table is fixed on the top of the switch shaft, the hollow inverted truncated table is located below the truncated table, and a A spring, the two ends of which are respectively connected to the hollow inverted cone and the cone, a lifting spring is connected to the top of the cone, and one end of the lifting spring away from the cone is connected to the inner top wall of the upper shell body, and a supporting wedge block is slidably provided on the inner side wall of the upper shell body, and the supporting wedge block has the freedom to move in the horizontal direction, and a wedge-shaped surface is provided at the bottom of the supporting wedge block, when the double-control switch acts on the corresponding contact of the torque microswitch, the lifting spring is in a compressed state, and the supporting wedge block is against the bottom of the cone.

[0017] Furthermore, a wedge block mounting groove is opened on the inner side wall of the upper shell, a switch pin is fixed in the wedge block mounting groove, the supporting wedge block is slidably sleeved on the switch pin, a limit spring is sleeved on the switch pin, and when the supporting wedge block contacts the bottom of the truncated table, the limit spring is in a normal state.

[0018] Furthermore, a slide groove is formed through the side wall of the trigger rod, and the slide groove extends along the axial direction of the trigger rod. The 7-shaped mounting rod slides through the slide groove, and a mounting hole is formed at one end of the 7-shaped mounting rod, and the switch mounting shaft is fixedly inserted into the mounting hole.

[0019] Further, the gear group is arranged on one side of the torque control screw, and the gear group includes a torque gear shaft, a torque screw bevel gear and a bevel gear. The torque gear shaft is rotatably arranged in the mechanical control box, the torque screw bevel gear is mounted on the torque control screw, the bevel gear is mounted on the torque gear shaft, the bevel gear meshes with the torque screw bevel gear, the torque input gear shaft and the torque gear shaft are respectively equipped with input helical gears and torque input helical gears, the torque input helical gear meshes with the input helical gear, and one end of the torque input gear shaft passes through the bottom of the valve body and is connected to a torque mating wheel.

[0020] The beneficial effects of the present invention are:

[0021] 1. The travel range is controlled by a screw drive, that is, the open stroke micro switch is triggered by the travel switch slider to feedback that the valve open stroke is in place, and the close stroke micro switch is triggered by the travel switch slider to feedback that the valve close stroke is in place. It has high transmission accuracy and efficiency, and can be used in high-speed, high-sensitivity and rigidity scenarios.

[0022] 2. The relative distance between the opening stroke micro switch and the closing stroke micro switch is adjustable, and the stroke range can be adjusted, so that the positions of the opening stroke micro switch and the closing stroke micro switch can be adjusted accordingly according to the switching range of the valve, so that the electric head control box can adapt to various types of valves, reducing the types of control boxes used and having good compatibility.

[0023] 3. The torque is adjusted by screw transmission, and the torque micro switch is triggered by the linear movement of the torque screw slider, which has the advantages of high control accuracy, high operability and stable control.

[0024] 4. The rotation speed of the spindle screw transmitted to the dial gear shaft is reduced through the groove wheel structure, and the valve switch position is fed back through the dial pointer. The groove wheel structure can effectively reduce the rotation speed of the dial gear shaft, and occupies a small area, which can adapt to the installation of the limited space of the mechanical control box.

[0025] 5. Both the stroke control and torque control components adopt modular design, which is convenient for installation in the mechanical control box after assembly, and is easy to disassemble and maintain later.

[0026] 6. The action of the torque microswitch is controlled by dual triggering of the torque screw slider and the double-control switch. Under normal conditions, the double-control switch triggers the torque microswitch to transmit normal signals. When an abnormality occurs, the torque screw slider triggers the double-control switch to separate the double-control switch from the torque microswitch, causing the torque microswitch to transmit abnormal signals and alarm, making the abnormal alarm more accurate, unaffected by vibration, and avoiding false alarms.

[0027] 7. The gear set that drives the torque control screw is installed on one side of the torque control component. Since the axial space of the torque control screw is insufficient, the gear set is installed using the radial space margin of the torque control screw in the mechanical control box so that the torque control component can operate stably. This allows the space in the mechanical control box to be reasonably used for layout and installation, making the structure of the entire electric head control box more compact and smaller in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial structural schematic diagram of a high-precision electric head control box based on lead screw control of the present invention;

[0029] Figure 2 The schematic diagram of the assembly between the stroke part and the torque control component of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 3 The schematic diagram of the assembly between the stroke part and the torque control component of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 4 The schematic diagram of the assembly between the stroke part and the torque control component of the present invention is shown in FIG. Figure 3 ;

[0032] Figure 5 This is a schematic diagram of the structure of a double-control switch in a high-precision electric head control box based on lead screw control according to the present invention;

[0033] Figure 6 This is a schematic diagram of the internal structure of a double-control switch in a high-precision electric head control box based on lead screw control according to the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of a high-precision electric head control box based on screw control in the present invention. Figure 1 ;

[0035] Figure 8 This is a schematic diagram of the structure of a high-precision electric head control box based on screw control in the present invention. Figure 2 ;

[0036] In the figure, 1-valve body, 2-mechanical control box, 3-stroke input shaft, 4-spindle screw, 5-stroke switch slider, 6-open stroke micro switch, 7-close stroke micro switch, 8-left support plate, 9-right support plate, 10-spindle screw fixed shaft, 11-slide rail, 12-slide rail slider, 13-stroke control plate, 14-connecting rod, 15-roller, 16-stroke input helical gear, 17-screw input helical gear, 18-stroke matching wheel, 19-drive plate, 20-drive shaft, 21-groove wheel shaft, 22-groove wheel, 23-arc groove, 24-dial gear shaft, 25-dial gear, 26-groove wheel shaft gear, 27-dial pointer, 28-transparent dial cover, 29-torque control screw, 30-torque input gear shaft, 31-torque screw fixing shaft, 32-switch installation shaft, 33-dual control switch, 34-torque micro switch, 35-torque screw slider, 36-upper shell, 37-switch body, 38-switch control panel, 39-trigger rod, 40-7-shaped mounting rod, 41-switch shaft, 42-hollow inverted round table, 43-round table, 44-spring, 45-slide, 46-lifting spring, 47-support wedge block, 48-torque gear shaft, 49-torque screw bevel gear, 50-bevel gear, 51-input helical gear, 52-torque input helical gear, 53-torque matching wheel, 54-wedge surface, 55-wedge block mounting groove, 56-switch pin, 57-limit spring. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0038] Embodiment 1

[0039] At present, the electric head control box basically adopts the Russian-supplied switch-type electric head control box, and its stroke control is completed by gear transmission and spring compression. Please refer to the background technology for details. Its control accuracy is not high, and it is very inconvenient to use in an environment with high precision and high sensitivity. However, the traditional Russian-supplied switch-type electric head control box has been used in the industry for many years. Due to the limitations of traditional thinking, it is difficult for industry personnel to make subversive designs for the traditional Russian-supplied switch-type electric head control box, or to make design improvements based on the traditional transmission method. The results achieved are difficult to achieve the expected results. With the widespread application of electric head control boxes in the field of nuclear power, higher requirements are put forward for electric head control boxes, and their control accuracy can no longer meet the requirements of the nuclear power field. Based on this background, the present application breaks the traditional inherent design and develops an electric head control box that meets the high precision and high sensitivity requirements of nuclear power, etc. Specifically, Figures 1 to 8As shown, a high-precision electric head control box based on screw control is used to connect the switch signal of the electric actuator feedback valve, including a valve body 1 and a mechanical control box 2 installed on the valve body 1, a screw control assembly is arranged in the mechanical control box 2, and the screw control assembly includes a stroke input shaft 3, a spindle screw 4, a stroke switch slider 5, an open stroke micro switch 6 and a close stroke micro switch 7. The stroke input shaft 3 is rotatably connected to the valve body 1, one end of the stroke input shaft 3 is used to connect the power input of the electric actuator, and the other end is drivingly connected to the spindle screw 4, the spindle screw 4 is threadedly sleeved with a stroke switch slider 5, the open stroke micro switch 6 and the close stroke micro switch 7 are arranged at intervals along the axial direction of the spindle screw 4, and the open stroke micro switch 6 The installation position of the opening stroke micro switch 7 and the installation position of the closing stroke micro switch 7 can be adjusted along the axial direction of the main shaft screw 4. The stroke switch slider 5 is used to trigger the opening stroke micro switch 6 or the closing stroke micro switch 7. The valve is opened and closed by the electric actuator providing power. The electric actuator can only provide power output, and the opening and closing degree of the valve is fed back through the electric head control box. The feedback signal acts on the electric actuator, and the electric actuator disconnects the power input to the valve according to the feedback signal. Therefore, the electric head control box is a control element, which feeds back the valve switching signal to the electric actuator, so that the electric actuator can accurately control the opening and closing of the valve. This belongs to the prior art, and the purpose is to illustrate the operation scenario of the electric head control box. The stroke input shaft 3 provides power input through the electric actuator, and the stroke input shaft 3 drives the main shaft screw 4 to rotate. The main shaft screw 4 and the stroke switch slider 5 form a screw transmission pair, so that the stroke switch slider 5 moves linearly along the axial direction of the main shaft screw 4. When the valve is in the opening stroke, the main shaft screw 4 rotates forward, so that the stroke switch slider 5 moves close to the opening stroke micro switch 6. When the stroke switch slider 5 touches the contact of the opening stroke micro switch 6, the opening stroke ends, the main shaft screw 4 stops rotating, and the valve is opened; after the closing stroke of the valve begins, the main shaft screw 4 rotates in the opposite direction, so that the stroke switch slider 5 moves close to the closing stroke micro switch 7. When the stroke switch slider 5 touches the contact of the closing stroke micro switch 7, the closing stroke is completed. At the end, the spindle screw 4 stops rotating and the valve is completely closed; the valve switch signal is fed back by screw transmission, which has higher accuracy and can accurately reflect the switch state of the valve, and can be applied to high-speed, high-sensitivity and rigidity scenes. The present invention applies the screw transmission mechanism to the electric head control box, which completely changes the transmission structure of the traditional electric head control box. Its advantages of high precision and high reliability can meet the use in high-demand environments such as the nuclear power field; secondly, the installation position of the opening stroke micro switch 6 and the closing stroke micro switch 7 is adjustable, and the time for the stroke switch slider 5 to move to trigger the stroke micro switch is controlled by adjusting the distance between the opening stroke micro switch 6 and the closing stroke micro switch 7, thereby controlling the execution time of the valve opening and closing;By adjusting the stroke range, the positions of the open stroke micro switch 6 and the closed stroke micro switch 7 can be adjusted according to the valve switch range, so that the electric head control box can adapt to various types of valves, reducing the types of control boxes used and having good compatibility; it can be adjusted over a large range, saving consumables costs or equipment purchase costs, R&D costs, and labor management costs, avoiding the disadvantages of poor compatibility. ;

[0040] Embodiment 2

[0041] In order to facilitate the replacement of the traditional stroke control structure with the lead screw control assembly as a whole, the present invention adopts a modular design to facilitate overall installation and disassembly. Specifically, based on the first embodiment, Figures 1 to 4 As shown, the screw control assembly also includes a left support plate 8, a right support plate 9 and a spindle screw fixed shaft 10. The left support plate 8 and the right support plate 9 are both mounted on the valve body 1 by screws. The spindle screw 4 is rotatably mounted on the left support plate 8 and the right support plate 9. The two ends of the spindle screw fixed shaft 10 are respectively fixedly connected to the left support plate 8 and the right support plate 9. The travel switch slider 5 is slidably sleeved on the spindle screw fixed shaft 10. The screw control assembly is installed on the left support plate 8 and the right support plate 9 as a whole. The screw control assembly can be assembled first on the outside of the mechanical control box with enough space for easy installation. Then the left support plate 8 and the right support plate 9 are installed in the mechanical control box 2 to achieve overall installation, which is convenient for subsequent disassembly and maintenance.

[0042] Furthermore, if Figures 1 to 4 As shown, two groups of slide rails 11 are fixed between the left support plate 8 and the right support plate 9, and the two ends of the slide rails 11 are respectively connected to the left support plate 8 and the right support plate 9, and the slide rails 11 are adapted to slide with slide rail blocks 12, and the slide rail blocks 12 are tightly pressed against the slide rails 11 by screws. The opening stroke microswitch 6 and the closing stroke microswitch 7 are respectively installed on the slide rail blocks 12 of the two groups of slide rails 11, and scales are provided on the slide rails 11 for convenient and intuitive reflection of the installation positions of the opening stroke microswitch 6 and the closing stroke microswitch 7. When the positions of the opening stroke microswitch 6 and the closing stroke microswitch 7 need to be adjusted, the screws on the slide rail blocks 12 are loosened accordingly so that the slide rail blocks 12 can move on the corresponding slide rails 11, and the opening stroke microswitch 6 or the closing stroke microswitch 7 is moved to the specified position according to the scale, and finally the screws are tightened. The distance between the opening stroke microswitch 6 and the closing stroke microswitch 7 can be adjusted to adapt to valves of different models, and the position can be adjusted by tightening the screws, and the adjustment method is simple and reliable.

[0043] Furthermore, if Figures 1 to 4As shown, a stroke control plate 13 is connected to the top of the stroke switch slider 5, and two groups of stroke trigger components are arranged on the stroke control plate 13. The stroke trigger components include a connecting rod 14 and a roller 15. One end of the connecting rod 14 is connected to the stroke control plate 13, and the other end is rotatably connected to the roller 15. The contact at the top of the open stroke microswitch 6 is located on the moving path of one of the rollers 15, and the contact at the top of the close stroke microswitch 7 is located on the moving path of the other roller 15. The two groups of slide rails 11 are arranged at intervals up and down and staggered along the radial direction of the main shaft screw 4, so that the open stroke microswitch 6 and the close stroke microswitch 7 will not collide during movement and adjustment, thereby improving the stroke adjustment range and being able to adapt to the control of more types of valves. The roller 15 is extended and installed by the connecting rod 14, so that the two rollers 15 correspond to the contacts of the open stroke microswitch 6 and the contacts of the close stroke microswitch 7 respectively, and the triggering of the open stroke microswitch 6 and the close stroke microswitch 7 is realized in a one-to-one correspondence manner, and the control is accurate and stable.

[0044] Embodiment 3

[0045] Based on the second embodiment, Figures 1 to 7 As shown, a stroke input bevel gear 16 is mounted on the stroke input shaft 3, and a screw input bevel gear 17 is mounted on the main shaft screw 4. The screw input bevel gear 17 meshes with the stroke input bevel gear 16. One end of the stroke input shaft 3 passes through the bottom of the valve body 1 and is connected with a stroke matching wheel 18. The stroke matching wheel 18 is used to connect the electric actuator. The electric actuator inputs power to the stroke input shaft 3 through the stroke matching wheel 18. The stroke input shaft 3 drives the main shaft screw 4 to rotate through the meshing of the stroke input bevel gear 16 and the screw input bevel gear 17, so that the stroke switch slider 5 on it moves linearly along the axial direction of the main shaft screw 4, so as to trigger the contacts of the open stroke micro switch 6 or the contacts of the closed stroke micro switch 7 through the stroke switch slider 5 to complete the valve switch signal; wherein, the power input part of the stroke input shaft 3 has not changed, and the stroke matching wheel 18 is still used to connect the electric actuator, so that the electric actuator will not be improved to adapt to the improvement of the electric head control box, thereby reducing the equipment investment cost.

[0046] Embodiment 4

[0047] The traditional Russian switch type electric head control box adopts a disc type adjustment in the torque adjustment part. The disc type adjustment controls the torque by adjusting the angle, but it is not convenient to control a small angle. At the same time, because the cam will be hit during installation after adjustment, resulting in angle changes, its accuracy is poor and does not meet the requirements of high-precision and high-sensitivity environments. Therefore, based on the third embodiment, as shown in FIG. Figures 1 to 7As shown, a torque control component is also provided in the mechanical control box 2, and the torque control component includes a torque input gear shaft 30, a torque control screw 29 and two groups of symmetrically arranged torque switch components. The torque input gear shaft 30 and the torque control screw 29 are both rotatably arranged, and the torque input gear shaft 30 is connected to the torque control screw 29 through a gear group transmission. The torque switch component includes a torque micro switch 34 and a torque screw slider 35. The torque screw slider 35 is threadedly sleeved on the torque control screw 29, and the torque screw slider 35 is used to trigger the torque micro switch 34. The torque control component also includes a fixed torque screw fixed shaft 31 and a switch installation shaft 32. The torque screw slider 35 is slidably sleeved on the torque screw fixed shaft 31, and the torque micro switch 34 is sleeved on the switch installation shaft 32. When the valve is blocked, that is, the valve cannot be opened and closed normally, at this time, the electric actuator cannot normally drive the stroke input shaft 3 to rotate and feedback the switch signal of the valve. At this time The torque of the electric actuator driving the electric head control box will gradually increase, thereby rotating the torque input gear shaft 30, which drives the torque control screw 29 to rotate, so that the torque screw slider 35 makes a linear motion along the axial direction of the torque control screw 29, so that the torque screw slider 35 triggers the torque micro switch 34 to respond, and the torque micro switch 34 sends a fault signal, so that the electric actuator stops running and issues an alarm, notifying the staff to go to the site for maintenance to protect the safety of the equipment; the torque control component also adopts a screw transmission method for torque adjustment, and the torque micro switch 34 is triggered by the linear movement of the torque screw slider 35, which has the advantages of high control accuracy, high operability and stable control; it is worth noting that the torque control screw 29, the torque screw fixed shaft 31 and the switch installation shaft 32 are all installed on the left support plate 8 and the right support plate 9, so that the torque control component is also installed using a modular design to achieve overall installation and disassembly.

[0048] Embodiment 5

[0049] Since the positions of the opening stroke micro switch 6 and the closing stroke micro switch 7 need to be adjusted over a wide range to adapt to the control of more different types of valves, the spindle screw 4 and the slide rail 11 are designed with the maximum length in the mechanical control box 2, resulting in a narrow remaining space between the two ends of the spindle screw 4 and the inner wall of the mechanical control box 2, and the gear set cannot be installed. Therefore, based on the fourth embodiment, as shown in FIG. Figures 1 to 4As shown, the gear set is arranged on one side of the torque control screw 29, and the gear set is installed by utilizing the space margin of the mechanical control box 2 in the radial direction of the torque control screw 29, so that the torque control component can operate stably, so that the space in the mechanical control box 2 can be reasonably utilized for layout and installation, so that the structure of the entire electric head control box is more compact and smaller in size; the gear set includes a torque gear shaft 48, a torque screw bevel gear 49 and a bevel gear 50, the torque gear shaft 48 is rotatably arranged in the mechanical control box 2, the torque screw bevel gear 49 is sleeved on the torque control screw 29, the bevel gear 50 is sleeved on the torque gear shaft 48, the bevel gear 50 meshes with the torque screw bevel gear 49, the torque input gear shaft 30 and the torque gear shaft 48 are respectively sleeved with an input bevel gear 51 and a torque input bevel gear 52, and the torque input bevel gear 5 2 meshes with the input bevel gear 51, one end of the torque input gear shaft 30 passes through the bottom of the valve body 1 and is connected to the torque matching wheel 53. The torque input gear shaft 30 is also connected to the electric actuator through the torque matching wheel 53. When the valve fails and the opening stroke or closing stroke is blocked, the electric actuator drives the torque input gear shaft 30 to rotate through the torque matching wheel 53. The torque input gear shaft 30 drives the torque gear shaft 48 to rotate through the meshing of the input bevel gear 51 and the torque input bevel gear 52. The torque gear shaft 48 drives the torque control lead screw 29 to rotate through the meshing of the torque lead screw bevel gear 49 and the bevel gear 50, so that the torque lead screw slider 35 moves on the torque control lead screw 29 to trigger the torque micro switch 34, so that when the valve is blocked, the torque control component can operate accurately and stably to feedback the fault information.

[0050] Embodiment 6

[0051] Based on Example 5, Figures 1 to 4 As shown, one end of the spindle screw 4 away from the stroke input shaft 3 is connected to the dial gear shaft 24 through a large-proportional speed reduction component. A dial pointer 27 is fixed to the end of the dial gear shaft 24 close to the inner wall of the mechanical control box 2. A transparent dial cover 28 is provided on the side wall of the mechanical control box 2. The transparent dial cover 28 is marked with scales along its own circumferential direction. The transparent dial cover 28 is used to display the dial pointer 27. The spindle screw 4 drives the dial gear shaft 24 to rotate while rotating, and the dial gear shaft 24 drives the dial pointer 27 thereon to deflect. The deflection position of the dial pointer 27 can be seen through the transparent dial cover 28. The dial pointer 27 cooperates with the scale on the transparent dial cover 28 to reflect the switch position of the valve, so that the switch position of the valve is visualized, which is convenient for controlling the opening degree of the valve.

[0052] Embodiment 7

[0053] Since the rotation speed of the main shaft screw 4 is relatively high, if the main shaft screw 4 drives the dial gear shaft 24 to rotate through the gear set, in order to reduce the rotation speed of the dial gear shaft 24, the transmission ratio between the gears needs to be designed to be larger, and the space in the mechanical control box 2 cannot accommodate a larger gear. Therefore, on the basis of the sixth embodiment, as shown in FIG. Figures 1 to 4 As shown, the large-proportion speed reduction component includes a rotatable grooved wheel shaft 21, a driving plate 19 mounted on the main shaft screw 4, a driving shaft 20 is eccentrically fixed on the driving plate 19, a grooved wheel 22 is mounted on the grooved wheel shaft 21, and a plurality of arc grooves 23 are evenly distributed on the side wall of the grooved wheel 22 along its own circumferential direction. The driving shaft 20 is used to act in the arc groove 23 to drive the grooved wheel 22 to deflect, a dial gear 25 is mounted on the dial gear shaft 24, and a grooved wheel shaft gear 26 is mounted on the grooved wheel shaft 21, and the grooved wheel shaft gear 26 engages with the dial gear 25, the main shaft screw 4 drives the driving plate 19 to rotate, the driving plate 19 drives the driving shaft 20 to rotate, the driving shaft 20 deflects into the arc groove 23 to drive the grooved wheel 22 to deflect, and after the grooved wheel 22 deflects a certain angle, the driving shaft 20 disengages from the arc groove 23, and the next The arc groove 23 moves to the moving path of the drive shaft 20. The drive shaft 20 needs to rotate one circle to adapt to the next arc groove 23 to drive the groove wheel to deflect. Therefore, the drive plate 19 rotates one circle, which can only drive the groove wheel 22 to deflect a certain angle. The deflection angle is designed according to the actual needs. The size of the groove wheel 22 and the number of arc grooves 23 thereon can greatly reduce the output speed of the main shaft screw 4, and the installation space occupied by the drive plate 19 and the groove wheel 22 is small; the groove wheel 22 drives the groove wheel shaft 21 to rotate, and the groove wheel shaft 21 drives the dial gear shaft 24 to rotate through the engagement of the dial gear 25 and the groove wheel shaft gear 26. The speed of the dial gear shaft 24 is reduced by the secondary deceleration, so that the dial pointer 27 deflects one circle to reflect the travel range of the valve being fully closed and fully opened.

[0054] Embodiment 8

[0055] On the basis of Example 7, Figures 1 to 6As shown, the torque switch assembly also includes a double-control switch 33. When the torque screw slider 35 triggers the double-control switch 33, the double-control switch 33 triggers the torque microswitch 34. The double-control switch 33 includes a switch housing, a trigger rod 39 and a 7-shaped mounting rod 40. One end of the 7-shaped mounting rod 40 is fixedly mounted on the switch mounting shaft 32. The trigger rod 39 is vertically arranged and slidably connected to the 7-shaped mounting rod 40. The switch housing is slidably sleeved on the trigger rod 39. The bottom arc transition of the trigger rod 39 is located on the moving path of the torque screw slider 35. The contact of the torque microswitch 34 is located on the moving path of the switch housing. When the travel switch slider 5 triggers the contact of the open travel microswitch 6, the travel switch slider 5 presses down one of the double-control switches 33. , so that the double-control switch 33 acts on the contact of the corresponding torque microswitch 34; when the travel switch slider 5 triggers the contact of the closing travel microswitch 7, the travel switch slider 5 presses down the other double-control switch 33, so that the double-control switch 33 acts on the contact of the corresponding torque microswitch 34. The torque microswitches 34 in the two groups of torque switch assemblies are one opening torque microswitch and the other closing torque microswitch, that is, the opening torque microswitch corresponds to the opening travel microswitch 6, and the closing torque microswitch corresponds to the closing travel microswitch 7. The double-control switch 33 is pressed down on the contact of the torque microswitch 34 by gravity, so that the torque microswitch 34 is in a closed state. When the valve opening stroke is blocked, the torque screw slider 35 moves close to the opening torque microswitch , the torque screw slider 35 squeezes the double-control switch on this path, so that the torque screw slider 35 squeezes the trigger rod 39 and moves upward, so that the switch housing of the double-control switch moves upward and disengages from the torque microswitch 34, thereby causing the torque microswitch 34 to feedback a fault signal; similarly, when the valve closing stroke is blocked, the torque screw slider 35 moves close to the closing torque microswitch, and the torque screw slider 35 squeezes the double-control switch on this path, so that the torque screw slider 35 squeezes the trigger rod 39 and moves upward, so that the switch housing of the double-control switch moves upward and disengages from the torque microswitch 34, thereby causing the torque microswitch 34 to feedback a fault signal, and fault feedback can be performed regardless of whether the valve is in an opening stroke or a closing stroke; when the valve is operating normally, due to the initial opening or initial closing of the valve, Closing will generate vibration and then gradually stabilize. In order to avoid the vibration when the valve starts that affects the torque microswitch 34 and causes a false alarm, when the travel switch slider 5 triggers the opening travel microswitch 6, the travel switch slider 5 presses down the switch housing, so that the switch housing is squeezed on the contacts of the opening torque microswitch, so that the vibration during startup cannot cause the switch housing to move upward and disengage from the contacts of the torque microswitch 34. Similarly, when the travel switch slider 5 triggers the closing travel microswitch 7, the travel switch slider 5 presses down another switch housing, so that the switch housing is squeezed on the contacts of the closing torque microswitch, so that the vibration during startup cannot cause the switch housing to move upward and disengage from the contacts of the torque microswitch 34, thereby making the torque control more stable and accurate, and no false alarm will occur.

[0056] Embodiment 9

[0057] On the basis of the eighth embodiment, the switch housing includes an upper housing 36, a switch body 37 and a switch control disk 38. The two ends of the switch body 37 are respectively connected to the upper housing 36 and the switch control disk 38. The contact of the torque micro switch 34 is located on the moving path of the switch control disk 38. A switch shaft 41 is arranged in the switch housing. The switch shaft 41 moves through the trigger rod 39 to connect the 7-shaped mounting rod 40. A hollow inverted round table 42 is fixed on the top of the trigger rod 39. A round table 4 is fixed on the top of the switch shaft 41. 3, the hollow inverted truncated platform 42 is located below the truncated platform 43, a spring 44 is arranged between the truncated platform 43 and the hollow inverted truncated platform 42, the two ends of the spring 44 are respectively connected to the hollow inverted truncated platform 42 and the truncated platform 43, the top of the truncated platform 43 is connected to a jacking spring 46, the end of the jacking spring 46 away from the truncated platform 43 is connected to the inner top wall of the upper shell 36, the inner side wall of the upper shell 36 is slidably provided with a supporting wedge block 47, the supporting wedge block 47 has the freedom to move in the horizontal direction, and the bottom of the supporting wedge block 47 is provided A wedge-shaped surface 54 is provided. When the double-control switch 33 acts on the contact of the corresponding torque microswitch 34, the lifting spring 46 is in a compressed state, and the supporting wedge block 47 is against the bottom of the round table 43. A wedge block mounting groove 55 is provided on the inner side wall of the upper shell 36. A switch pin 56 is fixed in the wedge block mounting groove 55. The supporting wedge block 47 is slidably sleeved on the switch pin 56. A limit spring 57 is sleeved on the switch pin 56. When the supporting wedge block 47 contacts the bottom of the round table 43, the limit spring 57 The spring 57 is in a normal state; in normal operation, the supporting wedge block 47 contacts the bottom of the truncated cone 43, and the wedge surface 54 is located on the moving path of the hollow inverted truncated cone 42. Since the truncated cone 43 is fixed to the 7-shaped mounting rod 40 through the switch shaft 41, the position of the truncated cone 43 will not change, thereby limiting the movement of the supporting wedge block 47 through the truncated cone 43, so that the entire switch housing cannot move upward, so that the switch control disk 38 can be stably pressed down on the contact of the torque micro switch 34 to prevent false triggering;When the valve is blocked during the opening or closing process, the torque input gear shaft 30 drives the torque control screw 29 to rotate through the gear set, so that the torque screw slider 35 on it moves close to the opening torque micro switch or the closing torque micro switch. At this time, the travel switch slider 5 is separated from the double-control switch, and the torque screw slider 35 squeezes the arc portion of the trigger rod 39 in the double-control switch, so that the trigger rod 39 drives the hollow inverted round table 42 to move close to the round table 43. The hollow inverted round table 42 squeezes the wedge surface 54 of the supporting wedge block 47, so that the wedge surface 54 squeezes the limit spring 57 away from the round table 43, so that the supporting wedge block 47 moves into the wedge block mounting groove 55 and separates from the round table 43, so that the switch housing is unlocked, and the entire switch housing bounces upward under the reaction force of the lifting spring 46, so that the switch control panel 38 is separated from the contacts of the torque micro switch 34 to send out a fault signal, notifying the staff to repair the exhaust pipe. After the fault is eliminated, the torque screw slider 35 is reset, and the trigger rod 39 is reset under the reaction force of the spring 44. At the same time, the travel switch slider 5 can move normally to feedback the valve switch signal. During the reset process of the travel switch slider 5, the upper housing 36 of the double-control switch will be squeezed. The top of the upper housing 36 is arc-shaped, so that the travel switch slider 5 can squeeze the entire switch housing to move downward. The switch housing carries the supporting wedge block 47 to move downward and reset, so that the switch control disk 38 presses the contact of the torque micro switch 34 again. At the same time, the supporting wedge block 47 moves to the bottom of the round table 43 again. Under the reaction force of the limit spring 57, the supporting wedge block 47 is reset to contact the bottom of the round table 43 to limit the movement of the switch housing, so that the entire travel part and the torque part are reset to work normally; it has high adjustment accuracy, can accurately reflect the fault signal, and will not cause false alarms. ;

[0058] Furthermore, a slide groove 45 is provided through the side wall of the trigger rod 39, and the slide groove 45 extends along the axial direction of the trigger rod 39. The 7-shaped mounting rod 40 slides through the slide groove 45. A mounting hole is provided at one end of the 7-shaped mounting rod 40. The switch mounting shaft 32 is fixedly provided in the mounting hole. Through the cooperation of the slide groove 45 and the 7-shaped mounting rod 40, the trigger rod 39 can stably slide on the 7-shaped mounting rod 40 to complete the torque control.

Claims

1. A high-precision electric head control box based on screw control, used to connect the switch signal of the electric actuator feedback valve, characterized in that: The invention comprises a valve body (1) and a mechanical control box (2) mounted on the valve body (1), wherein a screw control assembly is arranged in the mechanical control box (2), wherein the screw control assembly comprises a stroke input shaft (3), a spindle screw (4), a stroke switch slider (5), an opening stroke micro switch (6) and a closing stroke micro switch (7), wherein the stroke input shaft (3) is rotatably connected to the valve body (1), one end of the stroke input shaft (3) is used to connect to the power input of an electric actuator, and the other end is drivingly connected to the spindle screw (4), the spindle screw (4) is threadedly sleeved with a stroke switch slider (5), the opening stroke micro switch (6) and the closing stroke micro switch (7) are arranged at intervals along the axial direction of the spindle screw (4), and the installation position of the opening stroke micro switch (6) and the installation position of the closing stroke micro switch (7) can be adjusted along the axial direction of the spindle screw (4), and the stroke switch slider (5) is used to trigger the opening stroke micro switch (6) or the closing stroke micro switch (7) in a single manner; A torque control assembly is also arranged in the mechanical control box (2), the torque control assembly comprising a torque input gear shaft (30), a torque control lead screw (29) and two groups of symmetrically arranged torque switch assemblies, the torque input gear shaft (30) and the torque control lead screw (29) are both rotatably arranged, the torque input gear shaft (30) is connected to the torque control lead screw (29) through a gear group transmission, the torque switch assembly comprises a torque micro switch (34) and a torque lead screw slider (35), the torque lead screw slider (35) is threadedly mounted on the torque control lead screw (29), and the torque lead screw slider (35) is used to trigger the torque micro switch (34); The torque control assembly further comprises a fixed torque screw fixed shaft (31) and a switch mounting shaft (32), the torque screw slider (35) being slidably mounted on the torque screw fixed shaft (31), and the torque micro switch (34) being mounted on the switch mounting shaft (32); The torque switch assembly further comprises a double-control switch (33), the double-control switch (33) comprising a switch housing, a trigger rod (39) and a 7-shaped mounting rod (40), one end of the 7-shaped mounting rod (40) being fixedly mounted on the switch mounting shaft (32), the trigger rod (39) being vertically arranged and slidably connected to the 7-shaped mounting rod (40), the switch housing being slidably sleeved on the trigger rod (39), the bottom of the trigger rod (39) being in an arc transition and being located on the moving path of the torque lead screw slider (35), and the contact of the torque micro switch (34) being located on the moving path of the switch housing; When the travel switch slider (5) triggers the contact of the open-travel microswitch (6), the travel switch slider (5) presses down one of the double-control switches (33), so that the double-control switch (33) acts on the contact of the corresponding torque microswitch (34); When the travel switch slider (5) triggers the contact of the off-travel microswitch (7), the travel switch slider (5) presses down the other double-control switch (33), causing the double-control switch (33) to act on the contact of the corresponding torque microswitch (34).

2. According to the high-precision electric head control box based on lead screw control according to claim 1, it is characterized in that: The screw control assembly further comprises a left support plate (8), a right support plate (9) and a main spindle screw fixed shaft (10); the left support plate (8) and the right support plate (9) are both mounted on the valve body (1) by means of screws; the main spindle screw (4) is rotatably mounted on the left support plate (8) and the right support plate (9); the two ends of the main spindle screw fixed shaft (10) are respectively fixedly connected to the left support plate (8) and the right support plate (9); and the travel switch slider (5) is slidably sleeved on the main spindle screw fixed shaft (10).

3. A high-precision electric head control box based on lead screw control according to claim 2, characterized in that: Two groups of slide rails (11) are fixed between the left support plate (8) and the right support plate (9); slide rail sliders (12) are slidably adapted on the slide rails (11); the slide rail sliders (12) are fastened to the slide rails (11) by screws; and the opening stroke micro switch (6) and the closing stroke micro switch (7) are respectively mounted on the slide rail sliders (12) of the two groups of slide rails (11).

4. The high-precision electric head control box based on lead screw control according to claim 3 is characterized in that: The top of the travel switch slider (5) is connected to a travel control plate (13), and two groups of travel trigger components are arranged on the travel control plate (13). The travel trigger components include a connecting rod (14) and a roller (15). One end of the connecting rod (14) is connected to the travel control plate (13), and the other end is rotatably connected to the roller (15). The contact point at the top of the opening travel micro switch (6) is located on the moving path of one of the rollers (15), and the contact point at the top of the closing travel micro switch (7) is located on the moving path of the other roller (15).

5. The high-precision electric head control box based on lead screw control according to claim 1 is characterized in that: A stroke input bevel gear (16) is sleeved on the stroke input shaft (3), a screw input bevel gear (17) is sleeved on the main shaft screw (4), the screw input bevel gear (17) meshes with the stroke input bevel gear (16), and one end of the stroke input shaft (3) passes through the bottom of the valve body (1) and is connected to a stroke mating wheel (18).

6. The high-precision electric head control box based on lead screw control according to claim 1 is characterized in that: One end of the spindle screw (4) away from the stroke input shaft (3) is connected to the dial gear shaft (24) through a large-proportional speed reduction component, and one end of the dial gear shaft (24) close to the inner wall of the mechanical control box (2) is fixed with a dial pointer (27). The side wall of the mechanical control box (2) is provided with a transparent dial cover (28), and the transparent dial cover (28) is marked with scales along its own circumferential direction. The transparent dial cover (28) is used to display the dial pointer (27).

7. The high-precision electric head control box based on lead screw control according to claim 6 is characterized in that: The large-proportional speed reduction component comprises a rotatably arranged grooved wheel shaft (21), a driving plate (19) mounted on the spindle screw (4), a driving shaft (20) being eccentrically fixed on the driving plate (19), a grooved wheel (22) being mounted on the grooved wheel shaft (21), a side wall of the grooved wheel (22) being evenly distributed along its circumferential direction with a plurality of arc grooves (23), the driving shaft (20) being used to act in the arc grooves (23) to drive the grooved wheel (22) to deflect, a dial gear (25) being mounted on the dial gear shaft (24), a grooved wheel shaft gear (26) being mounted on the grooved wheel shaft (21), and the grooved wheel shaft gear (26) being meshed with the dial gear (25).

8. The high-precision electric head control box based on lead screw control according to claim 1 is characterized in that: The switch housing comprises an upper housing (36), a switch body (37) and a switch control disk (38); two ends of the switch body (37) are respectively connected to the upper housing (36) and the switch control disk (38); a contact of the torque micro switch (34) is located on a moving path of the switch control disk (38); a switch shaft (41) is arranged in the switch housing; the switch shaft (41) movably passes through the trigger rod (39) and is connected to the 7-shaped mounting rod (40); a hollow inverted truncated platform (42) is fixed to the top of the trigger rod (39); a truncated platform (43) is fixed to the top of the switch shaft (41); the hollow inverted truncated platform (42) is located below the truncated platform (43); and a spring is arranged between the truncated platform (43) and the hollow inverted truncated platform (42). A spring (44) is provided, wherein the two ends of the spring (44) are respectively connected to the hollow inverted truncated cone (42) and the truncated cone (43); the top of the truncated cone (43) is connected to a lifting spring (46); one end of the lifting spring (46) away from the truncated cone (43) is connected to the inner top wall of the upper shell (36); a supporting wedge block (47) is slidably provided on the inner side wall of the upper shell (36); the supporting wedge block (47) has a degree of freedom to move in a horizontal direction; a wedge-shaped surface (54) is provided at the bottom of the supporting wedge block (47); when the double-control switch (33) acts on the corresponding contact of the torque microswitch (34), the lifting spring (46) is in a compressed state, and the supporting wedge block (47) is against the bottom of the truncated cone (43).

9. The high-precision electric head control box based on lead screw control according to claim 8, characterized in that: The inner side wall of the upper shell (36) is provided with a wedge block mounting groove (55), a switch pin (56) is fixed in the wedge block mounting groove (55), the supporting wedge block (47) is slidably sleeved on the switch pin (56), a limit spring (57) is sleeved on the switch pin (56), and when the supporting wedge block (47) contacts the bottom of the round table (43), the limit spring (57) is in a normal state.

10. The high-precision electric head control box based on lead screw control according to claim 8, characterized in that: A sliding groove (45) is formed through the side wall of the trigger rod (39), the sliding groove (45) extending along the axial direction of the trigger rod (39), the 7-shaped mounting rod (40) slidingly passes through the sliding groove (45), one end of the 7-shaped mounting rod (40) is formed with a mounting hole, and the switch mounting shaft (32) is fixedly inserted into the mounting hole.

11. The high-precision electric head control box based on lead screw control according to claim 1, characterized in that: The gear set is arranged on one side of the torque control lead screw (29), and the gear set comprises a torque gear shaft (48), a torque lead screw bevel gear (49) and a bevel gear (50). The torque gear shaft (48) is rotatably arranged in the mechanical control box (2). The torque lead screw bevel gear (49) is sleeved on the torque control lead screw (29), and the bevel gear (50) is sleeved on the torque gear shaft (48). The bevel gear (50) meshes with the torque lead screw bevel gear (49). The torque input gear shaft (30) and the torque gear shaft (48) are respectively sleeved with an input bevel gear (51) and a torque input bevel gear (52). The torque input bevel gear (52) meshes with the input bevel gear (51). One end of the torque input gear shaft (30) passes through the bottom of the valve body (1) and is connected to a torque matching wheel (53).

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