A fluoroplastic plug valve and its use method

Abstract

The invention relates to the technical field of plug valves, and in particular to a fluoroplastic plug valve and a method for using the same. In view of the fact that the existing plug valves are not easy to disassemble or fix, and the valve core is easily offset when the liquid flow is large, a fluoroplastic plug valve is provided, comprising a valve body, a valve core is arranged inside the valve body, a first handle which can rotate and move up and down is arranged on the upper end of the valve core, a limit device is also arranged on the upper end of the valve core, when the first handle moves downward, a structure in which the limit device is closed can be formed, and when the first handle moves upward, a structure in which the limit device is opened can be formed; first expansion pads are also respectively arranged on the inlet and outlet pipes, and a plurality of incomplete threaded seats engaged with bolts are respectively arranged on the first expansion pads, when the driving cylinder rotates, a structure in which the incomplete threaded seats move outward and disengage from the bolts can be formed; the connecting pipes and bolts can be easily disassembled and assembled, and the valve core can be fixed to prevent displacement, thereby more accurately controlling the liquid flow.

Description

Technical Field

[0001] The invention relates to the technical field of plug valves, and in particular to a fluoroplastic plug valve and a use method thereof. Background Art

[0002] A plug valve is a valve used to control the flow of fluids. It is widely used in many fields such as petroleum, chemical industry, and water treatment. The working principle of a plug valve is based on a rotating plug or valve core, which is usually cylindrical or conical in shape and can rotate in the valve body to change the opening area of ​​the fluid channel, thereby achieving flow regulation or cutoff. Existing plug valves are usually fixed with bolts and nuts when connecting pipes. Since pipelines are usually installed in narrow spaces and have limited operating space, they are not easy to disassemble or fix. In addition, the valve core is usually fixed by friction when adjusting the flow, and is easily offset when the liquid flow is large. For this reason, a fluoroplastic plug valve is designed to solve the above-mentioned problems. Summary of the invention

[0003] In view of the fact that existing plug valves are difficult to disassemble or fix, and the valve core is easily offset when the liquid flow is large, the present invention provides a fluoroplastic plug valve that can facilitate the disassembly and assembly of connecting pipes and bolts, and can fix the valve core to prevent offset, thereby more accurately controlling the liquid flow, effectively solving the problems mentioned in the above background technology.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is:

[0005] A fluoroplastic plug valve, comprising a valve body, a valve core is arranged inside the valve body, a first handle which can rotate and move up and down is arranged on the upper end of the valve core, a limit device is also arranged on the upper end of the valve core, when the first handle moves downward, the limit device can be closed, when the first handle moves upward, the limit device can be opened; inlet and outlet pipes are respectively arranged on both sides of the valve body, the inlet and outlet pipes are respectively provided with detachable pipes, the pipes are respectively provided with a plurality of evenly distributed bolts, the inlet and outlet pipes are respectively provided with rotatable driving cylinders, the inlet and outlet pipes are also respectively provided with first expansion pads, the first expansion pads are respectively provided with a plurality of incomplete thread seats meshed with the bolts, when the driving cylinder rotates, the incomplete thread seats can be moved outwards and disengaged from the bolts;

[0006] Four evenly distributed first connecting rods are hinged on the outer surface of the driving cylinder, and four evenly distributed driving seats are slidably connected on one side end surface of the first expansion pad. The outer ends of the first connecting rods are hinged on the corresponding driving seats, and side plates are fixedly connected to the outer end surfaces of the driving seats. The incomplete threaded seats are slidably connected to the corresponding first expansion pads, and the incomplete threaded seats are fixedly connected to the first sliding pins, and the side plates are respectively provided with guide grooves matching the first sliding pins.

[0007] The valve core is rotatably connected to the inner wall of the valve body, an extension seat is fixedly connected to the upper end surface of the valve core, and the inner wall of the extension seat is slidably connected to a driving shaft fixed to the first handle; a connecting cylinder is fixedly connected to the outer surface of the driving shaft, and the limiting device includes a fixed toothed disc and a rotating toothed disc, the rotating toothed disc is fixedly connected to the upper end surface of the connecting cylinder, and the fixed toothed disc is fixedly connected to the inner wall of the upper end of the valve body.

[0008] The inner wall of the upper end of the valve body is fixedly connected with four evenly distributed long guide rods, the outer surface of the connecting tube is rotatably connected with a bracket, the bracket is slidably connected to the outer surfaces of the four long guide rods, and the outer surfaces of the long guide rods are respectively covered with first springs that match the brackets.

[0009] The outer surfaces of the pipes are respectively fixed with second expansion pads, the bolts are respectively rotatably connected to the second expansion pads, and one side end surfaces of the bolts are respectively fixed with nuts.

[0010] The guide grooves respectively include an inner transverse groove, an oblique groove and an outer transverse groove. When the drive seat and the side plate move, when the first sliding pin engages with the inner transverse groove, the first sliding pin can be locked at the innermost end; when the first sliding pin engages with the oblique groove, the first sliding pin can be moved outward or inward; when the first sliding pin engages with the outer transverse groove, the first sliding pin can be locked at the outermost end.

[0011] Coil springs are respectively fixedly connected to the outer surfaces of the inlet and outlet pipes, and the other ends of the coil springs are respectively fixedly connected to the corresponding driving cylinders.

[0012] Two centrally symmetrical extension rods are fixedly connected to the outer surface of the driving cylinder, and the inner walls of the extension rods are slidably connected to the limiting slides. The inner walls of the bottom ends of the extension rods are also fixedly connected to second springs that cooperate with the limiting slides. Wedge blocks are fixedly connected to the outer end surfaces of the limiting slides, and two blocking rods that cooperate with the wedge blocks are fixedly connected to the first expansion pad.

[0013] Conical rubber ports are fixedly connected to the outer end surfaces of the inlet and outlet pipes, and first connecting frames are fixedly connected to the inner walls of the driving cylinder. Two second connecting frames are fixedly connected to the inner walls of the inlet and outlet pipes, and a long cam is slidably connected to the two second connecting frames. Third sliding pins matching the long cams are fixedly connected to the inner walls of the first connecting frames, and top plates are fixedly connected to one side of the long cams. Four evenly distributed expansion rods are fixedly connected to the inner walls of the conical rubber ports, and four evenly distributed second connecting rods are hingedly connected to the outer surfaces of the top plates, and the outer ends of the second connecting rods are hingedly connected to the corresponding expansion rods.

[0014] A method for using a fluoroplastic plug valve comprises the following steps:

[0015] S1. Through the cooperation of the first handle, the valve core and the limit device, when the first handle moves up and down, the limit device can be driven to open or close. When the limit device is opened, the valve core and the first handle can be limited to rotate, so that the valve core is fixed;

[0016] S2 can fix the pipeline on the inlet and outlet pipes through the threaded connection of bolts and incomplete thread seats. When the pipeline needs to be unloaded, the incomplete thread seat can be moved outward by the rotatable driving cylinder when the driving cylinder rotates, so that the incomplete thread seat is disengaged from the bolts.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] During use, when the limit device is opened, it can limit the rotation of the valve core and the first handle, thereby fixing the valve core and preventing the valve core from rotating to more accurately control the liquid flow rate. When the limit device is closed, the first handle and the valve core can rotate to adjust the liquid flow rate. Through the threaded connection of the bolts and the incomplete threaded seat, the pipeline can be fixed on the inlet and outlet pipes. When the pipeline needs to be unloaded, the incomplete threaded seat can be moved outward by the rotatable driving cylinder when the driving cylinder rotates, so that the incomplete threaded seat is disengaged from the bolt, thereby quickly disassembling the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is an axonometric view of a fluoroplastic plug valve of the present invention.

[0020] Figure 2 The present invention is a cross-sectional view of a valve body of a fluoroplastic plug valve.

[0021] Figure 3 The present invention is a schematic diagram of the installation of a drive shaft of a fluoroplastic plug valve.

[0022] Figure 4 The present invention is a schematic diagram of the installation of a rotating toothed disc of a fluoroplastic plug valve.

[0023] Figure 5 The present invention is a schematic diagram of the installation of a drive cylinder of a fluoroplastic plug valve.

[0024] Figure 6 The present invention is a schematic diagram of the installation of a first expansion pad of a fluoroplastic plug valve.

[0025] Figure 7 The present invention is a cross-sectional view of the inlet and outlet pipes of a fluoroplastic plug valve.

[0026] Figure 8 The invention discloses a cross-sectional view of an extension rod of a fluoroplastic plug valve.

[0027] Fig. 9The present invention is a schematic diagram of the installation of a side plate of a fluoroplastic plug valve.

[0028] Fig.10 The present invention is a schematic diagram of the installation of a first connecting frame of a fluoroplastic plug valve.

[0029] Fig.11 The present invention is a cross-sectional view of a first connecting frame of a fluoroplastic plug valve.

[0030] Numbers in the figure: 1-valve body, 2-first handle, 3-valve core, 4-extension seat, 5-driving shaft, 7-fixed toothed disc, 8-rotating toothed disc, 9-connecting cylinder, 10-support seat, 11-long guide rod, 12-first spring, 14-inlet and outlet pipes, 15-driving cylinder, 16-first expansion pad, 17-pipeline, 18-second expansion pad, 19-nut, 20-bolt, 21-conical rubber port, 22-coil spring, 23-first connecting rod, 24-driving Moving seat, 25-side plate, 26-outer transverse groove, 27-oblique groove, 28-inner transverse groove, 29-first sliding pin, 30-incomplete threaded seat, 31-extension rod, 32-second spring, 33-limiting slide plate, 34-second handle, 35-wedge block, 36-block rod, 37-first connecting frame, 38-third sliding pin, 39-long cam, 40-extension shaft, 41-second connecting frame, 42-top plate, 43-second connecting rod, 44-expansion support rod. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0032] like Figure 1-Figure 11 As shown, the present invention provides a fluoroplastic plug valve, including a valve body 1, a valve core 3 is provided inside the valve body 1, a first handle 2 which can rotate and move up and down is provided on the upper end of the valve core 3, a limit device is also provided on the upper end of the valve core 3, when the first handle 2 moves downward, a structure in which the limit device is closed can be formed, and when the first handle 2 moves upward, a structure in which the limit device is opened can be formed; inlet and outlet pipes 14 are respectively provided on both sides of the valve body 1, a detachable pipe 17 is respectively provided on the inlet and outlet pipes 14, a plurality of evenly distributed bolts 20 are respectively provided on the pipes 17, a rotatable driving cylinder 15 is respectively provided on the inlet and outlet pipes 14, a first expansion pad 16 is also respectively provided on the inlet and outlet pipes 14, a plurality of incomplete thread seats 30 meshed with the bolts 20 are respectively provided on the first expansion pad 16, and when the driving cylinder 15 rotates, a structure in which the incomplete thread seats 30 move outward and disengage from the bolts 20 can be formed.

[0033] like Figure 1-Figure 7 As shown, the valve body 1 and the valve core 3 are prior art and will not be described in detail. Figure 2As shown, by setting the first handle 2, valve core 3 and limit device, when the first handle 2 moves up and down, the limit device can be driven to open or close. When the limit device is opened, the valve core 3 and the first handle 2 can be limited to rotate, so that the valve core 3 is fixed to prevent the valve core 3 from rotating to more accurately control the liquid flow. When the limit device is closed, the first handle 2 and the valve core 3 can rotate to adjust the liquid flow. The inlet and outlet pipes 14 are the inlet and outlet of the valve body 1. The inlet and outlet pipes 14 are used to connect the pipeline 17. Through the threaded connection of the bolt 20 and the incomplete threaded seat 30, the pipeline 17 can be fixed on the inlet and outlet pipes 14. When the pipeline 17 needs to be unloaded, the incomplete threaded seat 30 can be moved outward by the rotatable driving cylinder 15 when the driving cylinder 15 rotates, so that the incomplete threaded seat 30 is disengaged from the bolt 20, thereby quickly disassembling the pipeline 17.

[0034] The valve core 3 is rotatably connected to the inner wall of the valve body 1, and an extension seat 4 is fixedly connected to the upper end surface of the valve core 3. The inner wall of the extension seat 4 is slidably connected to a driving shaft 5 fixed to the first handle 2; a connecting tube 9 is fixedly connected to the outer surface of the driving shaft 5, and the limiting device includes a fixed toothed disc 7 and a rotating toothed disc 8, the rotating toothed disc 8 is fixedly connected to the upper end surface of the connecting tube 9, and the fixed toothed disc 7 is fixedly connected to the inner wall of the upper end of the valve body 1.

[0035] like Figure 2-Figure 4 As shown, the drive shaft 5 passes through the inner wall of the upper end of the valve body 1, that is, the drive shaft 5 can move up and down or rotate on the inner wall of the valve body 1; the extension seat 4 and the drive shaft 5 are spline-connected, and the drive shaft 5 can move up and down on the inner wall of the extension seat 4, and when the drive shaft 5 rotates, it can drive the extension seat 4 to rotate, that is, when the first handle 2 moves up and down, the drive shaft 5 can move up and down on the inner wall of the extension seat 4, and when the first handle 2 rotates, the drive shaft 5, the extension seat 4, and the valve core 3 can rotate; as shown in FIG. Figure 3-Figure 4 As shown, the rotating toothed disc 8 and the fixed toothed disc 7 can mesh with each other. When the first handle 2 and the driving shaft 5 move up and down, the rotating toothed disc 8 can be driven to move up and down. When the rotating toothed disc 8 moves upward to the top end, it can mesh with the fixed toothed disc 7. When the rotating gear meshes with the fixed toothed disc 7, the corresponding driving shaft 5 and the valve core 3 no longer rotate. When the first handle 2 and the driving shaft 5 move downward, the rotating toothed disc 8 can be driven to move downward and disengage from the fixed toothed disc 7. When the fixed toothed disc 7 disengages from the rotating toothed disc 8, the first handle 2, the driving shaft 5 and the rotating toothed disc 8 can rotate.

[0036] Four evenly distributed long guide rods 11 are fixedly connected to the inner wall of the upper end of the valve body 1, and a bracket 10 is rotatably connected to the outer surface of the connecting cylinder 9. The bracket 10 is slidably connected to the outer surfaces of the four long guide rods 11, and the outer surfaces of the long guide rods 11 are respectively covered with first springs 12 that match the bracket 10.

[0037] like Figure 4As shown, the first spring 12 always has an upward driving force on the bracket 10, so that the bracket 10, the connecting tube 9, and the rotating toothed disc 8 are in the topmost state under normal conditions, that is, the rotating toothed disc 8 can mesh with the fixed toothed disc 7 under normal conditions; the long guide rod 11 can limit the bracket 10 to move only up and down, and through the rotational connection between the connecting tube 9 and the bracket 10, the connecting tube 9 can drive the bracket 10 to move up and down when moving up and down, and does not affect the rotation of the connecting tube 9; when the valve needs to be adjusted, the first handle 2 is driven downward to make the drive shaft 5, the rotating toothed disc 8, the connecting tube 9, the bracket 10, etc. move downward, and when the rotating toothed disc 8 moves downward, it can be disengaged from the fixed toothed disc 7, and at this time, the first handle 2, the valve core 3, etc. can rotate. After the adjustment is completed, the first handle 2 is released. At this time, the first handle 2, the fixed toothed disc 7, etc. will move upward and reset under the elastic force of the first spring 12, that is, at this time, the rotating toothed disc 8 is meshed with the fixed toothed disc 7, that is, the valve core 3 can be limited to rotate.

[0038] The second expansion pads 18 are fixedly connected to the outer surfaces of the pipes 17 , and the bolts 20 are rotatably connected to the second expansion pads 18 . The end surfaces of one side of the bolts 20 are fixedly connected to nuts 19 .

[0039] like Figure 5 As shown, the nut 19 is convenient for driving the bolt 20 to rotate, and the bolts 20 are respectively connected to the second expansion pad 18 by rotation, so that the tightness of each bolt 20 can be adjusted individually.

[0040] Four evenly distributed first connecting rods 23 are hinged on the outer surface of the driving cylinder 15, and four evenly distributed driving seats 24 are slidably connected on one side end surface of the first expansion pad 16. The outer ends of the first connecting rods 23 are hinged on the corresponding driving seats 24, and the outer end surfaces of the driving seats 24 are fixedly connected with side plates 25. The incomplete threaded seats 30 are slidably connected to the corresponding first expansion pads 16, and the incomplete threaded seats 30 are fixedly connected with first sliding pins 29, and the side plates 25 are respectively provided with guide grooves matching the first sliding pins 29.

[0041] like Figure 7 or Fig. 9 As shown, by connecting the first connecting rod 23 with the drive cylinder 15 and the drive seat 24, when the drive cylinder 15 rotates, the drive seat 24 can be synchronously moved outward or inward. The installation and shape of the incomplete threaded seat 30, the side plate 25, the drive seat 24, and the first sliding pin 29 are as shown in FIG. Fig. 9As shown, when the driving seat 24 moves outward, the two incomplete thread seats 30 can be driven to move outward through the engagement of the first sliding pin 29 and the guide groove. When the incomplete thread seats 30 move outward, they will disengage with the corresponding bolts 20, and the bolts 20 can be quickly disassembled at this time. When the bolts 20 are inserted into the corresponding holes on the first expansion pad 16, the driving seat 24 moves inward and can drive the corresponding incomplete thread seats 30 to move inward. When the incomplete thread seats 30 move inward, they can engage with the corresponding bolts 20 to fix the pipe 17 again, and the bolts 20 and nuts can rotate independently, and the relative positions can be adjusted, which is convenient for quick disassembly and assembly of the connecting pipes 17 and bolts 20.

[0042] The guide grooves respectively include an inner transverse groove 28, an oblique groove 27 and an outer transverse groove 26. When the drive seat 24 and the side plate 25 move, when the first sliding pin 29 is engaged with the inner transverse groove 28, the first sliding pin 29 can be locked at the innermost end; when the first sliding pin 29 is engaged with the oblique groove 27, the first sliding pin 29 can be moved outward or inward; when the first sliding pin 29 is engaged with the outer transverse groove 26, the first sliding pin 29 can be locked at the outermost end.

[0043] like Fig. 9 As shown, through the engagement of the first sliding pin 29 with the inner transverse groove 28, the inclined groove 27 and the outer transverse groove 26, when the drive seat 24 and the side plate 25 are at the innermost end, the two first sliding pins 29 are locked on the inner wall of the inner transverse groove 28, that is, the corresponding incomplete threaded seat 30 is in the innermost end locked state, and is stably engaged with the bolt 20. When the drive seat 24 and the side plate 25 move outward or inward, under the engagement of the first sliding pin 29 and the inclined groove 27, the corresponding first sliding pin 29 and incomplete threaded seat 30 can be driven to move outward or inward, that is, to control the engagement or disengagement with the bolt 20. When the drive plate and the side plate 25 move to the outermost end, the first sliding pin 29 can be engaged with the outer transverse groove 26. At this time, the two incomplete threaded seats 30 are in the outermost end locked state, that is, they can be stably disengaged from the bolt 20.

[0044] Coil springs 22 are fixedly connected to the outer surfaces of the inlet and outlet pipes 14 , respectively, and the other ends of the coil springs 22 are fixedly connected to the corresponding driving cylinders 15 .

[0045] like Figure 7 As shown, the coil spring 22 always exerts a driving force on the drive tube 15, so that the drive seat 24 and the side plate 25 are at the innermost end under normal conditions, that is, the corresponding incomplete thread seat 30 is at the innermost end under normal conditions.

[0046] Two centrally symmetrical extension rods 31 are fixedly connected to the outer surface of the driving cylinder 15, and the inner walls of the extension rods 31 are slidably connected to the limiting slides 33. The inner walls of the bottom ends of the extension rods 31 are also fixedly connected to second springs 32 that cooperate with the limiting slides 33. Wedge blocks 35 are fixedly connected to the outer end surfaces of the limiting slides 33, and two blocking rods 36 that cooperate with the wedge blocks 35 are fixedly connected to the first expansion pad 16.

[0047] like Figure 6-Figure 8 As shown, the extension rod 31 is used to support the limit slide 33 and the wedge block 35. The second spring 32 always has an outward driving force on the limit slide, so that the limit slide 33 is at the outermost end under normal conditions. The installation and shape of the limit slide 33 and the wedge block 35 are as shown in FIG. Figure 8 As shown, the limiting slide plate 33 and the wedge block 35 can slide inwardly or outwardly on the inner wall of the extension rod 31, and the upper end surface of the limiting slide plate 33 is also fixedly connected to the second handle 34. The function of the second handle 34 is to facilitate the driving of the limiting slide plate 33 and the wedge block 35 to move inwardly or outwardly; when the driving cylinder 15 rotates, it can drive the extension rod 31, the limiting slide plate 33, the wedge block 35 and the like to move synchronously in a circular manner. When the wedge block 35 moves in a circular manner to the inclined surface and contacts the blocking rod 36, the wedge will move inwardly under the obstruction of the blocking rod 36, that is, the wedge block 35 enters the inner wall of the extension rod 31 and compresses the second spring 32. When the wedge block 35 moves in a circular manner and disengages from the blocking rod 36, the wedge block 35 will be pressed against the second spring 32. The wedge block 35 is moved outwardly and popped out under the elastic force of the spring 32. When the drive cylinder 15, the wedge block 35, etc. rotate in the opposite direction, the straight surface of the wedge block 35 will contact the stop rod 36, that is, the stop rod 36 blocks the wedge block 35, the drive cylinder 15, etc. from resetting, that is, the corresponding drive seat 24 can be at the outermost end, and the incomplete thread seat 30 can be in an open state at the outermost end, so that the incomplete thread seat 30 is in a stable state at the outermost end. When it is necessary to make the drive cylinder 15 and the wedge block 35 move inwardly, the corresponding wedge block 35 can be driven to move inwardly by driving the two first handles 2 to move inwardly. After the wedge block 35 moves inwardly until it is out of contact with the stop rod 36, the drive cylinder 15 and the wedge block 35 will be reset to the initial state under the elastic force of the coil spring 22 itself.

[0048] Conical rubber ports 21 are fixedly connected to the outer end surfaces of the inlet and outlet pipes 14, and first connecting frames 37 are fixedly connected to the inner walls of the driving cylinder 15. Two second connecting frames 41 are fixedly connected to the inner walls of the inlet and outlet pipes 14, and a long cam 39 is slidably connected to the two second connecting frames 41. Third sliding pins 38 matching the long cam 39 are fixedly connected to the inner walls of the first connecting frames 37, and top plates 42 are fixedly connected to one side of the long cams 39. Four evenly distributed expansion rods 44 are fixedly connected to the inner walls of the conical rubber ports 21, and four evenly distributed second connecting rods 43 are hingedly connected to the outer surfaces of the top plates 42, and the outer ends of the second connecting rods 43 are hingedly connected to the corresponding expansion rods 44.

[0049] like Figure 7 , Figure 10-11 As shown, the conical rubber mouth 21 has a certain elastic deformation, and the conical rubber mouth 21 can strengthen the connection between the sealing pipe 17 and the inlet and outlet pipe 14. The first connecting frame 37 penetrates the inlet and outlet pipe 14 and is rotatably connected to the inner wall of the inlet and outlet pipe 14. The inlet and outlet pipe 14 is provided with a fan-shaped groove for the installation of the first connecting frame 37. The inside of the first connecting frame 37 is sleeved on the outer surface of the long cam 39, and the long cam 39 can move left and right on the inner wall of the first connecting frame 37; the extension shafts 40 are respectively fixed on the left and right end surfaces of the long cam 39, and the extension shafts 40 are respectively slidably connected to the inner wall of the second connecting frame 41, which is equivalent to The long cam 39 is slidably connected to the inner wall of the second connecting frame 41, and the extension shaft 40 and the second connecting frame 41 are splined, that is, the extension shaft 40 can slide left and right on the inner wall of the second connecting frame 41, and cannot rotate, that is, the limited long cam 39 cannot rotate; the top plate 42 is fixedly connected to one end face of the extension shaft 40, which is equivalent to being fixedly connected to one end face of the long cam 39; when the driving cylinder 15 rotates, it can drive the corresponding first connecting frame 37 to rotate, and when the first connecting frame 37 rotates, it will drive the corresponding third sliding pin 38 to rotate in a circle, and when the third sliding pin 38 rotates in a circle, it will rotate with the long cam When the second connecting rod 43 is engaged, the long cam 39 is driven to move to the left or right, that is, the corresponding top plate 42 and the second connecting rod 43 are driven to move to the left or right. When the second connecting rod 43 moves to the left or right, the corresponding expansion rod 44 can be driven to move outward or inward. When the expansion rod 44 moves outward, it can expand and squeeze the tapered rubber mouth 21, so that the tapered rubber mouth 21 is closer to the inner wall of the pipe 17. When the expansion rod 44 moves inward, it can pull the tapered rubber mouth 21 inward to close inward, that is, the tapered rubber mouth 21 is more convenient to break away from the contact with the pipe 17. , which is convenient for disassembly; therefore, through the cooperation of the driving cylinder 15, the incomplete threaded seat 30, and the long cam 39, when the two incomplete threaded seats 30 are at the innermost end closed, that is, engaged with the bolt 20, the long cam 39 can drive the expansion rod 44 to be at the outermost end state, that is, the tapered rubber mouth 21 fits the inner wall of the pipe 17 more closely, and when the two incomplete threaded seats 30 are at the outermost end open, that is, the incomplete threaded seat 30 is no longer engaged with the bolt 20, and the expansion rod 44 is in a retracted state, that is, the corresponding tapered rubber mouth 21 is in a retracted state, which will not be repeated.

[0050] A method for using a fluoroplastic plug valve comprises the following steps:

[0051] S1. Through the cooperation of the first handle 2, the valve core 3 and the limit device, when the first handle 2 moves up and down, the limit device can be driven to open or close. When the limit device is opened, the valve core 3 and the first handle 2 can be limited to rotate, so that the valve core 3 is fixed;

[0052] S2. Through the threaded connection cooperation of the bolt 20 and the incomplete threaded seat 30, the pipe 17 can be fixed on the inlet and outlet pipes 14. When the pipe 17 needs to be unloaded, the incomplete threaded seat 30 can be moved outward by the rotatable driving cylinder 15 when the driving cylinder 15 rotates, so that the incomplete threaded seat 30 and the bolt 20 are disengaged.

[0053] When the present invention is in use, when the limit device is opened, it can limit the rotation of the valve core 3 and the first handle 2, so that the valve core 3 is fixed and the valve core 3 is prevented from rotating to more accurately control the liquid flow. When the limit device is closed, the first handle 2 and the valve core 3 can rotate to adjust the liquid flow. Through the threaded connection cooperation of the bolt 20 and the incomplete threaded seat 30, the pipeline 17 can be fixed on the inlet and outlet pipes 14. When the pipeline 17 needs to be unloaded, the incomplete threaded seat 30 can be moved outward by the rotatable driving cylinder 15 when the driving cylinder 15 rotates, so that the incomplete threaded seat 30 is disengaged from the bolt 20, thereby quickly disassembling the pipeline 17.

[0054] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A fluoroplastic plug valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve core (3) inside, and a first handle (2) which can rotate and move up and down is provided at the upper end of the valve core (3). A limit device is also provided at the upper end of the valve core (3). When the first handle (2) moves downward, the limit device can be closed, and when the first handle (2) moves upward, the limit device can be opened. Inlet and outlet pipes (14) are provided on both sides of the valve body (1). Removable pipes (17) are provided on the inlet and outlet pipes (14). The pipes (17) are provided with a plurality of evenly distributed bolts (20). The inlet and outlet pipes (14) are provided with rotatable drive cylinders (15). The inlet and outlet pipes (14) are also provided with first expansion pads (16). The first expansion pads (16) are provided with a plurality of incomplete thread seats (30) meshed with the bolts (20). When the drive cylinder (15) rotates, the incomplete thread seats (30) can be moved outward to disengage from the bolts (20). Four evenly distributed first connecting rods (23) are hingedly connected to the outer surface of the driving cylinder (15), and four evenly distributed driving seats (24) are slidably connected to the end surface of one side of the first expansion pad (16). The outer ends of the first connecting rods (23) are hingedly connected to the corresponding driving seats (24), and the outer end surfaces of the driving seats (24) are fixedly connected to the side plates (25). The incomplete thread seats (30) are slidably connected to the corresponding first expansion pads (16), and the incomplete thread seats (30) are fixedly connected to the first sliding pins (29), and the side plates (25) are respectively provided with guide grooves matching the first sliding pins (29).

2. A fluoroplastic plug valve as claimed in claim 1, characterized in that: The valve core (3) is rotatably connected to the inner wall of the valve body (1); an extension seat (4) is fixedly connected to the upper end surface of the valve core (3); a driving shaft (5) fixedly connected to the first handle (2) is slidably connected to the inner wall of the extension seat (4); a connecting tube (9) is fixedly connected to the outer surface of the driving shaft (5); the limiting device comprises a fixed toothed disc (7) and a rotating toothed disc (8); the rotating toothed disc (8) is fixedly connected to the upper end surface of the connecting tube (9); and the fixed toothed disc (7) is fixedly connected to the inner wall of the upper end of the valve body (1).

3. A fluoroplastic plug valve as claimed in claim 2, characterized in that: The inner wall of the upper end of the valve body (1) is fixedly connected to four evenly distributed long guide rods (11); a bracket (10) is rotatably connected to the outer surface of the connecting tube (9); the bracket (10) is slidably connected to the outer surfaces of the four long guide rods (11); and first springs (12) matching the brackets (10) are respectively sleeved on the outer surfaces of the long guide rods (11).

4. A fluoroplastic plug valve as claimed in claim 1, characterized in that: The second expansion pads (18) are fixedly connected to the outer surfaces of the pipes (17), the bolts (20) are rotatably connected to the second expansion pads (18), and nuts (19) are fixedly connected to one side end surfaces of the bolts (20).

5. A fluoroplastic plug valve as claimed in claim 1, characterized in that: The guide grooves respectively include an inner transverse groove (28), an inclined groove (27) and an outer transverse groove (26). When the drive seat (24) and the side plate (25) move, when the first sliding pin (29) is engaged with the inner transverse groove (28), the first sliding pin (29) can be locked at the innermost end; when the first sliding pin (29) is engaged with the inclined groove (27), the first sliding pin (29) can be moved outward or inward; when the first sliding pin (29) is engaged with the outer transverse groove (26), the first sliding pin (29) can be locked at the outermost end.

6. A fluoroplastic plug valve as claimed in claim 1, characterized in that: Coil springs (22) are respectively fixedly connected to the outer surfaces of the inlet and outlet pipes (14), and the other ends of the coil springs (22) are respectively fixedly connected to the corresponding driving cylinders (15).

7. A fluoroplastic plug valve as claimed in claim 1, characterized in that: Two centrally symmetrical extension rods (31) are fixedly connected to the outer surface of the driving cylinder (15), and the inner walls of the extension rods (31) are slidably connected to the limiting slides (33). The inner walls of the bottom ends of the extension rods (31) are also fixedly connected to second springs (32) that match the limiting slides (33). The outer end surfaces of the limiting slides (33) are fixedly connected to wedge blocks (35), and the first expansion pads (16) are fixedly connected to two blocking rods (36) that match the wedge blocks (35).

8. A fluoroplastic plug valve as claimed in claim 1, characterized in that: The outer end surfaces of the inlet and outlet pipes (14) are respectively fixedly connected with conical rubber ports (21); the inner walls of the driving cylinders (15) are respectively fixedly connected with first connecting frames (37); the inner walls of the inlet and outlet pipes (14) are respectively fixedly connected with two second connecting frames (41); the two second connecting frames (41) are respectively slidably connected with a long cam (39); the inner walls of the first connecting frames (37) are respectively fixedly connected with third sliding pins (38) matching with the long cams (39); one side of the long cams (39) is respectively fixedly connected with a top plate (42); the inner walls of the conical rubber ports (21) are respectively fixedly connected with four evenly distributed expansion rods (44); the outer surfaces of the top plates (42) are respectively hinged with four evenly distributed second connecting rods (43); the outer ends of the second connecting rods (43) are respectively hinged with the corresponding expansion rods (44).

9. The method for using a fluoroplastic plug valve as claimed in claim 1, characterized in that: The steps include: S1. By means of the cooperation between the first handle (2), the valve core (3) and the limiting device, when the first handle (2) moves up and down, the limiting device can be driven to open or close; when the limiting device is opened, the valve core (3) and the first handle (2) can be limited to rotate, thereby fixing the valve core (3); S2. The pipe (17) can be fixed to the inlet and outlet pipes (14) by means of the threaded connection of the bolt (20) and the incomplete threaded seat (30). When the pipe (17) needs to be unloaded, the incomplete threaded seat (30) can be moved outward by means of the rotatable driving cylinder (15) when the driving cylinder (15) rotates, so that the incomplete threaded seat (30) is disengaged from the bolt (20).

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