Synchronous assembly machine for valve rod and valve element of stop valve

Abstract

The invention relates to the technical field of stop valve assembly, and discloses a stop valve rod and valve element synchronous assembly machine which comprises an assembly machine base, a valve rod fixing and pressing mechanism, a valve element fixing and rotating mechanism and a controller. The valve rod fixing and pressing mechanism further comprises a vertical electro-hydraulic rod set, the output end of the vertical electro-hydraulic rod set is fixedly connected with a U-shaped machine body, the inner side of the U-shaped machine body is fixedly connected with a bottom baffle, the top of the bottom baffle is slidably connected with a limiting plate, a touch starting switch is installed at the bottom of the limiting plate, and the thickness T of the limiting plate is consistent with the assembling length L between the valve rod and the valve element. Assembly torsion between the valve rod and the valve element can be effectively controlled, and the situation that the assembly quality is affected due to improper assembly torsion between the valve rod and the valve element is avoided; and the assembly torque and the assembly length between the valve rod and the valve element can be monitored through the torque sensor and the distance sensor.

Description

Technical Field

[0001] The invention relates to the technical field of stop valve assembly, in particular to a stop valve stem and valve core synchronous assembly machine. Background Art

[0002] As an extremely important shut-off valve, the sealing pair of the stop valve is mainly composed of the valve core sealing surface and the valve seat sealing surface. By applying torque to the valve stem to drive the valve core to move vertically along the center line of the valve seat, the valve core sealing surface can be closely fitted with the valve seat sealing surface, thereby preventing the medium from leaking along the gap between the two sealing surfaces. When assembling the stop valve, the synchronous assembly of the valve stem and the valve core is one of the key steps to ensure the normal operation of the stop valve, and the common synchronous assembly methods between the valve stem and the valve core are: threaded connection assembly method, pin fixed assembly method, spring fixed assembly method, key connection assembly method, etc. Among them, the threaded connection assembly method is the most widely used assembly method.

[0003] After searching, the Chinese invention patent with the publication number of CN 109794750 A discloses a new type of automatic assembly and shrinking device for the valve stem of a stop valve, including a base, a pillar welded to one side outer wall of the base, a hydraulic cylinder fixed to one side outer wall of the pillar by screws, a mounting block welded to the end of the piston rod of the hydraulic cylinder, a first manipulator is arranged on the bottom outer wall of the mounting block, a top plate is welded to the top outer wall of the pillar, a limit plate is welded to the middle of the bottom outer wall of the top plate, a mounting groove is provided in the middle of the outer wall of the side of the limit plate away from the pillar, and a pressure sensor is fixed inside the mounting groove by screws, a groove is provided at the end of the bottom of the top plate away from the pillar, an electric slide is installed on the top inner wall of the groove by screws, a slider is slidably connected to the inner wall of the electric slide, a connecting rod is welded to the bottom end of the slider, and a positioning rod is welded to one side outer wall of the connecting rod. Compared with the prior art, the Chinese invention patent with the publication number of CN 109794750 A has a simple structure, less manufacturing materials, can reduce manufacturing costs, and can accurately locate the installation position after feeding.

[0004] However, during the process of threaded assembly of the valve stem and the valve core by the automatic assembly shrinking device of the valve stem of the above-mentioned new type of stop valve, there is an assembly distance between the end of the valve stem and the top of the valve core instead of being in a state of contact with each other, which will make it difficult to effectively control the assembly torsion between the valve stem and the valve core. However, if the assembly torsion between the valve stem and the valve core is too small, it will affect the firmness of the connection between the two. If the assembly torsion between the valve stem and the valve core is too large, it will increase the difficulty of subsequent disassembly, which will affect the assembly quality between the valve stem and the valve core. Therefore, a stop valve stem and valve core synchronous assembly machine that can effectively control the assembly torsion between the valve stem and the valve core is needed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcoming in the prior art that the assembly torsion between the valve stem and the valve core is difficult to be effectively controlled, and to propose a synchronous assembly machine for the valve stem and the valve core of a stop valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A stop valve stem and valve core synchronous assembly machine, comprising an assembly machine base, a valve stem fixing and pressing mechanism arranged inside the assembly machine base, a valve core fixing and rotating mechanism, and a controller embedded outside the assembly machine base, wherein the valve stem fixing and pressing mechanism and the valve core fixing and rotating mechanism both include a fixing tool for fixing the valve stem or the valve core; The valve stem fixing and pressing mechanism also includes a vertical electro-hydraulic rod group installed outside the assembly base, the output end of the vertical electro-hydraulic rod group is fixedly connected to a U-shaped body, the fixing tool for fixing the valve stem is installed inside the U-shaped body, the inner side of the U-shaped body is fixedly connected to a bottom baffle, the top of the bottom baffle is slidably connected to a limit plate for limiting the end position of the valve stem, a touch start switch is installed at the bottom of the limit plate, the thickness T of the limit plate is consistent with the assembly length L between the valve stem and the valve core, and a touch zeroing switch is also installed on the inner side of the U-shaped body; The valve core fixing and rotating mechanism also includes a cavity opened in the upper part of the assembly base, a rotating motor and a torque sensor are installed inside the cavity, an output end of the rotating motor is fixedly connected to a connecting shaft of the torque sensor, another connecting shaft of the torque sensor is fixedly connected to a rotating chassis rotatably connected to the inside of the cavity, and the fixing tool for fixing the valve core is installed on the top of the rotating chassis; The touch start switch can start the rotating motor when pressed, the torque sensor can turn off the rotating motor when the preset torque value is reached, and the touch zeroing switch can reset the torque sensor to zero when pressed; When the end of the valve stem contacts the top of the valve core, the start switch will be squeezed to start the rotating motor. The torque sensor can detect the torque value generated by the rotating motor. When the torque value generated by the rotating motor reaches the preset torque value, the torque sensor can turn off the rotating motor to stop assembly. After resetting, the upper fixed tooling can squeeze the zeroing switch to reset the torque sensor to zero.

[0007] The above technical solution further includes: The fixed tooling comprises a horizontal electro-hydraulic rod group installed on the inner side of the U-shaped fuselage or the top side of the rotating chassis, the input end of the horizontal electro-hydraulic rod group is connected to the controller, the output end of the horizontal electro-hydraulic rod group is fixedly connected to a movable work block, the touch-to-zero switch is located on the outer side of the movable work block above, a fixed work block is arranged on the outside of the movable work block in a relatively opposite position, the fixed work block is fixedly connected to the inner side of the U-shaped fuselage or the top side of the rotating chassis, and anti-slip pads are arranged on the inner sides of the movable work block and the fixed work block; by starting the extension and retraction of the horizontal electro-hydraulic rod group through the controller, the closing of the movable work block and the fixed work block can be achieved, thereby achieving the fixation of the valve stem or the valve core.

[0008] The output end of the vertical electro-hydraulic rod group is connected to the controller, and the outside of the limit plate is fixedly connected to a middle connecting plate, and one side of the middle connecting plate is symmetrically fixedly connected to an abutment rod, and the end of the abutment rod symmetrically away from the middle connecting plate is provided with an abutment block symmetrically fixedly connected to the bottom of the movable working block, and the other side of the middle connecting plate is symmetrically fixedly connected to an elastic telescopic rod, and the ends of the elastic telescopic rod symmetrically away from the middle connecting plate are commonly fixedly connected to a sliding block slidably connected to the U-shaped fuselage; when the upper movable working block and the fixed working block are closed to fix the valve stem, the abutment block can abut the symmetrical abutment rod, so that the middle connecting plate drives the limit plate away from the end of the valve stem to avoid interfering with subsequent assembly work.

[0009] A sliding groove is provided on the inner side of the U-shaped body, the sliding block is slidably connected to the inside of the sliding groove, a distance sensor connected to the controller is embedded in the inner top of the sliding groove, the sensing base point P of the distance sensor is located at the outer top of the sliding block, and the maximum distance Hmax between the bottom surface of the distance sensor and the top surface of the sliding block is consistent with the assembly length L between the valve stem and the valve core; when the torque value generated by the rotating motor reaches the preset torque value for closing, if the distance sensing value of the distance sensor is close to zero, it indicates that the assembly torque and assembly length are in place at this time.

[0010] The outside of the limit plate is provided with a self-lubricating mechanism for lubricating the valve stem assembly position, and the self-lubricating mechanism includes an annular groove opened on the top of the limit plate, and the inside of the annular groove is symmetrically connected to a rotating shaft, and the outside of the symmetrical rotating shaft is fixedly connected to a lubricating cotton roller; The self-lubricating mechanism also includes a silo symmetrically fixedly connected to the outer side of the limit plate, a grease column in contact with the lubricating cotton roller is placed inside the silo, an opening is opened on the outside of the silo and an L-shaped fixing plate is fixedly connected, and a tightening spring passing through the opening and in contact with the grease column is fixedly connected to the inner side of the L-shaped fixing plate; The setting of the clamping spring enables the grease column to contact the lubricating cotton roller, so that the lubricating cotton roller absorbs the grease. When the lubricating cotton roller with the grease rotates, it can lubricate the assembly position of the valve stem to reduce the assembly resistance.

[0011] The self-lubricating mechanism also includes an empty groove opened inside the limit plate, the top of the empty groove is connected to the bottom of the annular groove, the middle of the empty groove is fixedly connected to a fixed shaft, the outside of the fixed shaft is rotatably connected to a rotating cylinder, the outside of the rotating cylinder is fixedly connected to an upper connecting disc body and a lower connecting gear, the rotating shaft is symmetrically rotatably connected to the inside of the upper connecting disc body and the bottom is fixedly connected to a meshing gear, the outside of the meshing gear is symmetrically meshed with an inner gear ring fixedly connected to the inside of the empty groove, and the outside of the lower connecting gear is meshed with a meshing gear rod slidably connected to the inside of the empty groove; The rotating cylinder, the upper connecting disc body, the lower connecting gear and the symmetrical lubricating cotton roller can rotate synchronously, that is, the symmetrical lubricating cotton roller rotates while revolving, so that the assembly position of the valve stem can be lubricated to reduce assembly resistance.

[0012] The self-lubricating mechanism further comprises a T-shaped groove symmetrically arranged on the top of the upper movable block and a through groove symmetrically arranged on the top of the upper fixed block; The inside of the limit plate is symmetrically fixedly connected with a pneumatic cylinder fixedly connected to the middle connecting plate and extending to the inside of the through groove, and one end of the pneumatic cylinder is symmetrically provided with a piston connecting rod, one of the piston connecting rods is fixedly connected to the meshing gear rod, and the other end of the pneumatic cylinder is symmetrically provided with a piston abutment rod, and the end of the symmetrical piston abutment rod away from the through groove is fixedly connected with a T-shaped block slidably connected to the inside of the T-shaped groove; When the upper movable block and the fixed block are closed to fix the valve stem, the T-shaped block can push in the symmetrical piston abutment rod, so that the piston connecting rod extends and drives the meshing gear rod to move and drive the meshing gear to rotate to realize the symmetrical revolution and rotation of the lubricating cotton roller.

[0013] The present invention has the following beneficial effects: 1. The limit plate in the present invention can limit the end position of the valve stem, and the thickness T of the limit plate is consistent with the assembly length L between the valve stem and the valve core. When the end of the valve stem contacts the top of the valve core, the touch start switch installed at the bottom of the limit plate will be squeezed to start the rotating motor, and the start of the rotating motor will drive the fixed valve core to rotate, and the torque sensor can detect the torque value generated by the rotating motor. When the torque value generated by the rotating motor reaches the preset torque value, the torque sensor can turn off the rotating motor to stop the assembly between the valve stem and the valve core, and the upper fixed tooling after resetting can squeeze the touch zeroing switch to zero the torque sensor, so that the assembly torsion between the valve stem and the valve core can be effectively controlled to avoid improper assembly torsion between the valve stem and the valve core and affect the assembly quality.

[0014] 2. The present invention drives the fixed valve stem to be pressed down by the valve stem fixing downward mechanism, and drives the fixed valve core to be rotated by the valve core fixing rotation mechanism, so as to realize the synchronous assembly of the valve stem and the valve core of the stop valve. In this process, not only the torque sensor can monitor the assembly torque, but the distance sensor can also monitor the assembly length, that is, the assembly torque and assembly length between the valve stem and the valve core can be monitored by the torque sensor and the distance sensor.

[0015] 3. The symmetrical lubricating cotton roller in the present invention is in contact with the assembly position of the valve stem. In the process of fixing the valve stem by closing the upper movable block and the fixed block, the symmetrical rotating axis can be rotated to change position, and the symmetrical rotating axis can rotate while rotating to change position, that is, the symmetrical lubricating cotton roller can revolve and rotate to achieve self-lubrication of the valve stem assembly position, thereby reducing the assembly resistance between the valve stem and the valve core to ensure the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view structural schematic diagram of a stop valve stem and valve core synchronous assembly machine proposed by the present invention; Figure 2 A first structural schematic diagram of a stop valve stem and valve core synchronous assembly machine proposed by the present invention; Figure 3 It is a schematic diagram of the external structure of the assembly base in the present invention; Figure 4 It is a schematic diagram of the side section structure of the assembly base in the present invention; Figure 5 It is a schematic diagram of the external structure of the U-shaped fuselage in the present invention; Figure 6 It is a schematic diagram of the side section structure of the U-shaped fuselage in the present invention; Figure 7 Schematic diagram of the external structure of the limiting plate in the present invention; Figure 8 It is a schematic diagram of the side section structure of the limiting plate in the present invention; Fig. 9 Schematic diagram of the internal structure of the limiting plate in the present invention; Fig.10 A second structural schematic diagram of a stop valve stem and valve core synchronous assembly machine proposed by the present invention; Fig.11 A third structural schematic diagram of a stop valve stem and valve core synchronous assembly machine proposed by the present invention; Fig.12 for Fig.11 A schematic diagram of an enlarged front view structure of ; Fig.13 for Fig.12 A schematic diagram of the structure enlargement in the middle; Fig.14 for Fig.12 A magnified schematic diagram of the structure at B in the middle; Fig.15 This is a fourth structural schematic diagram of a stop valve stem and valve core synchronous assembly machine proposed by the present invention.

[0017] In the figure: 100, assembly base; 200, valve stem fixing and pressing mechanism; 201, vertical electro-hydraulic rod group; 202, U-shaped body; 203, bottom baffle; 204, limit plate; 205, touch start switch; 206, touch zero switch; 207, middle connecting plate; 208, abutment rod; 209, abutment block; 210, elastic telescopic rod; 211, sliding block; 212, sliding groove; 213, distance sensor; 300, valve core fixing and rotating mechanism; 301, cavity; 302, rotating motor; 303, torque sensor; 304, rotating chassis; 230, fixed tooling; 231, horizontal electro-hydraulic rod group; 232, movable work block; 233, fixed work block; 234 , anti-slip pad; 400, controller; 500, valve stem; 600, valve core; 700, self-lubricating mechanism; 701, annular groove; 702, rotating shaft; 703, lubricating cotton roller; 704, silo; 705, grease column; 706, opening; 707, L-shaped fixing plate; 708, tightening spring; 709, empty groove; 710, fixed shaft; 711, rotating cylinder; 712, upper connecting disk body; 713, lower connecting gear; 714, meshing gear; 715, inner ring gear; 716, meshing gear rod; 717, T-slot; 718, through slot; 719, pneumatic cylinder; 720, piston connecting rod; 721, piston abutment rod; 722, T-block; 800, manipulator. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0019] like Figure 1-Figure 6 and Figure 10-Figure 15 As shown, a stop valve stem and valve core synchronous assembly machine proposed by the present invention comprises an assembly machine base 100, a valve stem fixing and pressing mechanism 200 arranged inside the assembly machine base 100, a valve core fixing and rotating mechanism 300, and a controller 400 embedded outside the assembly machine base 100, the valve stem fixing and pressing mechanism 200 fixes and presses the valve stem 500, and the valve core fixing and rotating mechanism 300 fixes and rotates the valve core 600, thereby realizing the synchronous assembly of the stop valve stem 500 and the valve core 600, and the specific structure and connection method of the controller 400 adopt the existing technology, so they are not described in detail in this embodiment; The valve stem fixing and pressing mechanism 200 and the valve core fixing and rotating mechanism 300 both include a fixing tool 230 for fixing the valve stem 500 or the valve core 600. The fixing tool 230 includes a horizontal electro-hydraulic rod group 231 installed on the inner side of the U-shaped body 202 or the top side of the rotating chassis 304. The input end of the horizontal electro-hydraulic rod group 231 is connected to the controller 400. The output end of the horizontal electro-hydraulic rod group 231 is fixedly connected to a movable block 232. The outer side of the movable block 232 is provided with a fixed block 233 in a relatively opposite position. The fixed block 233 is fixedly connected to the inner side of the U-shaped body 202 or the top side of the rotating chassis 304. The inner sides of the movable block 232 and the fixed block 233 are both provided with anti-skid pads 234. By starting the extension and retraction of the horizontal electro-hydraulic rod group 231 through the controller 400, the movable block 232 and the fixed block 233 can be closed, thereby fixing the valve stem 500 or the valve core 600. The valve stem fixing and pressing mechanism 200 also includes a vertical electro-hydraulic rod group 201 installed outside the assembly base 100, the output end of the vertical electro-hydraulic rod group 201 is connected to the controller 400, the output end of the vertical electro-hydraulic rod group 201 is fixedly connected to a U-shaped body 202, a fixing tool 230 for fixing the valve stem 500 is installed inside the U-shaped body 202, a bottom baffle 203 is fixedly connected to the inner side of the U-shaped body 202, a limit plate 204 for limiting the end position of the valve stem 500 is slidably connected to the top of the bottom baffle 203, and a trigger start switch 205 is installed at the bottom of the limit plate 204. The trigger start switch 205 The rotating motor 302 can be started by being squeezed. The thickness T of the limit plate 204 is consistent with the assembly length L between the valve stem 500 and the valve core 600. That is, when the end of the valve stem 500 contacts the top of the valve core 600, the touch start switch 205 installed at the bottom of the limit plate 204 is squeezed by the lower movable block 232 or the fixed block 233, so that the rotating motor 302 is started. A touch zeroing switch 206 is also installed on the inner side of the U-shaped body 202. The touch zeroing switch 206 is located on the outer side of the upper movable block 232. The touch zeroing switch 206 is squeezed to reset the torque sensor 303 to zero. The outside of the limiting plate 204 is fixedly connected with a middle connecting plate 207, and one side of the middle connecting plate 207 is symmetrically fixedly connected with an abutting rod 208, and the end of the symmetrical abutting rod 208 away from the middle connecting plate 207 is provided with an abutting block 209 symmetrically fixedly connected to the bottom of the movable block 232, and the other side of the middle connecting plate 207 is symmetrically fixedly connected with an elastic telescopic rod 210, and the end of the symmetrical elastic telescopic rod 210 away from the middle connecting plate 207 is jointly fixedly connected with a sliding block 211 slidably connected to the U-shaped fuselage 202. When the upper movable block 232 and the fixed block 233 are closed to fix the valve stem 500, the abutting block 209 can abut the symmetrical abutting rod 208, so that the middle connecting plate 207 drives the limiting plate 204 away from the end of the valve stem 500 to avoid interference with subsequent assembly work; A sliding groove 212 is provided on the inner side of the U-shaped body 202, and a sliding block 211 is slidably connected inside the sliding groove 212. A distance sensor 213 connected to the controller 400 is embedded in the inner top of the sliding groove 212. The sensing base point P of the distance sensor 213 is located at the outer top of the sliding block 211. The maximum distance Hmax between the bottom surface of the distance sensor 213 and the top surface of the sliding block 211 is consistent with the assembly length L between the valve stem 500 and the valve core 600. When the torque value generated by the rotating motor 302 reaches the preset torque value for closing, if the distance sensing value of the distance sensor 213 is close to zero, it indicates that the assembly torque and assembly length are in place at this time. The valve core fixing and rotating mechanism 300 also includes a cavity 301 opened in the upper part of the assembly base 100, and a rotating motor 302 and a torque sensor 303 are installed inside the cavity 301. The output end of the rotating motor 302 is fixedly connected to a connecting shaft of the torque sensor 303, and the other connecting shaft of the torque sensor 303 is fixedly connected to a rotating chassis 304 rotatably connected inside the cavity 301. The fixing tool 230 for fixing the valve core 600 is installed on the top of the rotating chassis 304. When the rotating motor 302 is started to drive the rotating chassis 304, the fixing tool 230 and the fixed valve core 600 to rotate, the torque sensor 303 can detect the torque value generated by the rotating motor 302. When the torque sensor 303 reaches the preset torque value, it can turn off the rotating motor 302 to stop the assembly between the valve stem 500 and the valve core 600.

[0020] The working principle of this embodiment is as follows: Figure 1 As shown, the valve stem 500 is placed on the inner side of the upper fixed block 233 by the manipulator 800 and the end of the valve stem 500 is ensured to abut against the top of the limit plate 204. Then, the controller 400 starts the extension of the upper horizontal electro-hydraulic rod group 231, so that the movable block 232 and the fixed block 233 are closed to fix the valve stem 500. When the upper movable block 232 and the fixed block 233 are closed to fix the valve stem 500, the symmetrical abutment block 209 can move with the movable block 232 and abut the symmetrical abutment rod 208. The abutted symmetrical abutment rod 208 drives the limit plate 204 to slide on the top of the bottom baffle 203 through the middle connecting plate 207 and compress the symmetrical elastic telescopic rod 210. The limit plate 204 slides away from the end of the valve stem 500 to avoid interference with subsequent assembly work. After the valve stem 500 is fixed, the valve core 600 is placed on the inner side of the lower fixed block 233 by the manipulator 800 and the end of the valve core 600 is ensured to abut against the top of the rotating chassis 304. Then, the controller 400 starts to shorten the lower horizontal electro-hydraulic rod group 231 so that the movable block 232 and the fixed block 233 are closed to fix the valve core 600. like Fig.10 As shown, after the valve stem 500 and the valve core 600 are fixed, the controller 400 starts to shorten the vertical electro-hydraulic rod group 201, so that the U-shaped body 202 drives the internal structure thereof to move downward; like Fig.11As shown, when the end of the valve stem 500 contacts the top of the valve core 600, the touch start switch 205 installed at the bottom of the limit plate 204 is squeezed by the fixed block 233 below, and the touch start switch 205 can start the rotating motor 302 when being squeezed. The start of the rotating motor 302 will drive the valve core 600 fixed on the top of the rotating chassis 304 to rotate, and the torque sensor 303 can detect the torque value generated by the rotating motor 302. At the same time, the U-shaped body 202 drives the valve stem 500 fixed inside it to move downward, and the movable block 232 and the fixed block 233 rotating below will always squeeze the touch start switch 205, and relative sliding in the vertical direction occurs between the limit plate 204 and the bottom baffle 203; During the relative sliding (in the vertical direction) between the limit plate 204 and the bottom baffle plate 203, the vertical positions of the limit plate 204, the middle connecting plate 207, the abutting rod 208, the elastic telescopic rod 210 and the sliding block 211 remain stationary relative to the assembly base 100, and the distance sensor 213 moving with the U-shaped body 202 moves downward and gradually approaches the sensing base point P on the top surface of the sliding block 211, that is, the distance sensing value of the distance sensor 213 gradually decreases; like Fig.15 As shown, when the torque value generated by the rotating motor 302 reaches the preset torque value, the torque sensor 303 can turn off the rotating motor 302 to stop the assembly between the valve stem 500 and the valve core 600. At this time, the distance sensing value of the distance sensor 213 can be observed by the controller 400. Since the maximum distance Hmax between the bottom surface of the distance sensor 213 and the top surface of the sliding block 211 is consistent with the assembly length L between the valve stem 500 and the valve core 600, if the observed distance sensing value of the distance sensor 213 is close to zero, it indicates that the assembly torque and assembly length are in place at this time. Subsequently, the controller 400 starts the extension of the lower horizontal electro-hydraulic rod group 231 to release the fixing effect of the valve core 600, and then the controller 400 starts the extension of the vertical electro-hydraulic rod group 201, so that the U-shaped body 202 drives the valve stem 500 and the valve core 600 structure with threaded assembly inside it to move upward, and then the manipulator 800 clamps the valve stem 500 and the valve core 600 with threaded assembly, and then the controller 400 starts the shortening of the upper horizontal electro-hydraulic rod group 231 to release the fixing effect of the valve stem 500. When the upper horizontal electro-hydraulic rod group 231 shortens and resets, the upper movable block 232 can squeeze and trigger the zeroing switch 206, and the zeroing switch 206 can be squeezed to reset the torque sensor 303, and finally the valve stem 500 and the valve core 600 with threaded assembly can be removed by the manipulator 800. Thereafter, the above steps are repeated to carry out threaded assembly of the next valve stem 500 and valve core 600 .

[0021] The main difference between this embodiment and the prior art is that the limit plate 204 in this embodiment can limit the end position of the valve stem 500, and the thickness T of the limit plate 204 is consistent with the assembly length L between the valve stem 500 and the valve core 600. When the end of the valve stem 500 contacts the top of the valve core 600, the touch start switch 205 installed at the bottom of the limit plate 204 will be squeezed to start the rotating motor 302. The start of the rotating motor 302 will drive the fixed valve core 600 to rotate, and the torque sensor 303 can rotate The torque value generated by the motor 302 is detected. When the torque value generated by the rotating motor 302 reaches the preset torque value, the torque sensor 303 can turn off the rotating motor 302 to stop the assembly between the valve stem 500 and the valve core 600, and the upper fixed tooling 230 after reset can squeeze and touch the zeroing switch 206 to zero the torque sensor 303, so that the assembly torsion between the valve stem 500 and the valve core 600 can be effectively controlled to avoid improper assembly torsion between the valve stem 500 and the valve core 600 and affect the assembly quality; The fixed valve stem 500 is pressed down by the valve stem fixing pressing mechanism 200, and the fixed valve core 600 is rotated by the valve core fixing rotating mechanism 300, so that the synchronous assembly of the stop valve stem 500 and the valve core 600 can be achieved. In this process, not only the torque sensor 303 can monitor the assembly torque, but the distance sensor 213 can also monitor the assembly length, that is, the torque sensor 303 and the distance sensor 213 can monitor the assembly torque and assembly length between the valve stem 500 and the valve core 600. Example

[0022] like Figure 1-Figure 2 , Figure 5-Figure 12 and Fig.15 As shown, based on the first embodiment, the outer portion of the limit plate 204 is provided with a self-lubricating mechanism 700 for lubricating the assembly position of the valve stem 500. The self-lubricating mechanism 700 includes an annular groove 701 provided on the top of the limit plate 204. The inner portion of the annular groove 701 is symmetrically rotatably connected with a rotating shaft 702. The outer portions of the symmetrical rotating shafts 702 are fixedly connected with lubricating cotton rollers 703. The lubricating cotton rollers 703 coated with grease can lubricate the assembly position of the valve stem 500 to reduce the assembly resistance when rotating. The self-lubricating mechanism 700 also includes a silo 704 symmetrically fixedly connected to the outside of the limit plate 204, a grease column 705 in contact with the lubricating cotton roller 703 is placed inside the silo 704, an opening 706 is opened on the outside of the silo 704 and an L-shaped fixing plate 707 is fixedly connected thereto, the width of the opening 706 on the side close to the lubricating cotton roller 703 is smaller to prevent the grease column 705 inside the silo 704 from being squeezed out and detached, a clamping spring 708 passing through the opening 706 and in contact with the grease column 705 is fixedly connected to the inner side of the L-shaped fixing plate 707, the clamping spring 708 is arranged so that the grease column 705 can be squeezed to contact with the lubricating cotton roller 703, so that the lubricating cotton roller 703 can absorb the grease; The self-lubricating mechanism 700 also includes an empty groove 709 provided inside the limiting plate 204, the top of the empty groove 709 is connected to the bottom of the annular groove 701, a fixed shaft 710 is fixedly connected to the middle of the empty groove 709, a rotating cylinder 711 is rotatably connected to the outside of the fixed shaft 710, an upper connecting disk 712 and a lower connecting gear 713 are fixedly connected to the outside of the rotating cylinder 711, the rotating cylinder 711, the upper connecting disk 712, the lower connecting gear 713 and the symmetrical lubricating cotton roller 703 rotate synchronously, and the rotating shaft 710 rotates symmetrically. 02 is rotatably connected to the interior of the upper connecting disk body 712 and fixedly connected to the bottom with a meshing gear 714, the symmetrical meshing gear 714 is externally meshed with an inner gear ring 715 fixedly connected to the interior of the empty slot 709, when the symmetrical lubricating cotton roller 703 rotates synchronously, the two meshing gears 714 meshing with the inner gear ring 715 can drive the symmetrical lubricating cotton roller 703 to rotate by the rotating shaft 702, and the outer part of the lower connecting gear 713 is meshed with a meshing gear rod 716 slidably connected to the interior of the empty slot 709; The self-lubricating mechanism 700 also includes a T-shaped slot 717 symmetrically opened on the top of the upper movable block 232 and a through slot 718 symmetrically opened on the top of the upper fixed block 233. The inside of the limit plate 204 is symmetrically fixedly connected with a pneumatic cylinder 719 fixedly connected to the middle connecting plate 207 and extending to the inside of the through slot 718. A piston connecting rod 720 is arranged inside one end of the symmetrical pneumatic cylinder 719. One piston connecting rod 720 is fixedly connected to the meshing gear rod 716. The other end of the symmetrical pneumatic cylinder 719 is fixedly connected to the meshing gear rod 716. A piston abutment rod 721 is provided, and the symmetrical piston abutment rod 721 is fixedly connected with a T-shaped block 722 slidably connected inside the T-shaped groove 717 at one end away from the groove 718. When the upper movable block 232 and the fixed block 233 are closed to fix the valve stem 500, the T-shaped block 722 can push in the symmetrical piston abutment rod 721, so that the piston connecting rod 720 extends and drives the meshing gear rod 716 to move and drive the meshing gear 714 to rotate to realize the symmetrical revolution and rotation of the lubricating cotton roller 703.

[0023] The working principle of this embodiment is as follows: based on the first embodiment, when the upper movable block 232 and the fixed block 233 are closed to fix the valve stem 500, the symmetrical T-shaped block 722 will first push the symmetrical piston abutment rod 721 to realize the self-lubrication of the lubricating cotton roller 703 on the assembly position of the valve stem 500, and the symmetrical abutment block 209 will then abut the symmetrical abutment rod 208 to remove the position of the limit plate 204. In the process of removing the position of the limit plate 204, the internal structure of the limit plate 204, the symmetrical piston abutment rod 721 and the symmetrical pneumatic cylinder 719 move synchronously; During the process of the symmetrical T-shaped block 722 pushing the symmetrical piston abutment rod 721 into the interior of the pneumatic cylinder 719, the symmetrical piston connecting rod 720 will extend and drive the meshing gear rod 716 to move. The movement of the meshing gear rod 716 will drive the meshing gear 714, the rotating cylinder 711, the upper connecting disk body 712 and the symmetrical rotating shaft 702 to rotate. During the rotation of the symmetrical rotating shaft 702, it will be driven by its external inner gear ring 715 and the meshing gear 714 to rotate, that is, the symmetrical lubricating cotton roller 703 can revolve and rotate to achieve self-lubrication of the valve stem 500 assembly position.

[0024] The main difference between this embodiment and the prior art is that the symmetrical lubricating cotton roller 703 in this embodiment is in contact with the assembly position of the valve stem 500, and in the process of fixing the valve stem 500 by closing the upper movable block 232 and the fixed block 233, the symmetrical rotating shaft 702 can be rotated for position change, and the symmetrical rotating shaft 702 can rotate while rotating for position change, that is, the symmetrical lubricating cotton roller 703 can revolve and rotate to achieve self-lubrication of the assembly position of the valve stem 500, thereby reducing the assembly resistance between the valve stem 500 and the valve core 600 to ensure the assembly quality.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve stem and valve core synchronous assembly machine, comprising an assembly machine base (100), a valve stem fixing and pressing mechanism (200) arranged inside the assembly machine base (100), a valve core fixing and rotating mechanism (300), and a controller (400) embedded outside the assembly machine base (100), characterized in that: The valve stem fixing and pressing mechanism (200) and the valve core fixing and rotating mechanism (300) both include a fixing tool (230) for fixing the valve stem (500) or the valve core (600); The valve stem fixing and pressing mechanism (200) further comprises a vertical electro-hydraulic rod group (201) mounted on the outside of the assembly base (100); the output end of the vertical electro-hydraulic rod group (201) is fixedly connected to a U-shaped body (202); the fixing tool (230) for fixing the valve stem (500) is mounted inside the U-shaped body (202); the inner side of the U-shaped body (202) is fixedly connected to a bottom baffle (203); the top of the bottom baffle (203) is slidably connected to a limit plate (204) for limiting the end position of the valve stem (500); a touch start switch (205) is mounted on the bottom of the limit plate (204); the thickness T of the limit plate (204) is consistent with the assembly length L between the valve stem (500) and the valve core (600); and a touch zeroing switch (206) is also mounted on the inner side of the U-shaped body (202); The valve core fixing and rotating mechanism (300) further comprises a cavity (301) opened in the upper part of the assembly base (100), a rotating motor (302) and a torque sensor (303) are installed inside the cavity (301), an output end of the rotating motor (302) is fixedly connected to a connecting shaft of the torque sensor (303), another connecting shaft of the torque sensor (303) is fixedly connected to a rotating chassis (304) rotatably connected to the inside of the cavity (301), and the fixing tool (230) for fixing the valve core (600) is installed on the top of the rotating chassis (304); The touch start switch (205) can start the rotating motor (302) when it is pressed, the torque sensor (303) can turn off the rotating motor (302) when it reaches a preset torque value, and the touch zeroing switch (206) can reset the torque sensor (303) to zero when it is pressed.

2. A stop valve stem and valve core synchronous assembly machine according to claim 1, characterized in that: The fixed tooling (230) comprises a horizontal electro-hydraulic rod group (231) installed on the inner side of the U-shaped fuselage (202) or the top side of the rotating chassis (304); the input end of the horizontal electro-hydraulic rod group (231) is connected to the controller (400); the output end of the horizontal electro-hydraulic rod group (231) is fixedly connected to a movable work block (232); the touch zeroing switch (206) is located on the outer side of the movable work block (232) above; a fixed work block (233) is arranged on the outside of the movable work block (232) in a relatively opposite position; the fixed work block (233) is fixedly connected to the inner side of the U-shaped fuselage (202) or the top side of the rotating chassis (304); and anti-slip pads (234) are arranged on the inner sides of both the movable work block (232) and the fixed work block (233).

3. A stop valve stem and valve core synchronous assembly machine according to claim 2, characterized in that: The output end of the vertical electro-hydraulic rod group (201) is connected to the controller (400); the outer portion of the limit plate (204) is fixedly connected to a middle connecting plate (207); one side of the middle connecting plate (207) is symmetrically fixedly connected to an abutting rod (208); one end of the abutting rod (208) away from the middle connecting plate (207) is symmetrically provided with an abutting block (209) fixedly connected to the bottom of the movable working block (232); the other side of the middle connecting plate (207) is symmetrically fixedly connected to an elastic telescopic rod (210); one end of the elastic telescopic rod (210) away from the middle connecting plate (207) is fixedly connected to a sliding block (211) slidably connected to the U-shaped fuselage (202).

4. A stop valve stem and valve core synchronous assembly machine according to claim 3, characterized in that: A sliding groove (212) is provided on the inner side of the U-shaped body (202); the sliding block (211) is slidably connected to the inside of the sliding groove (212); a distance sensor (213) connected to the controller (400) is embedded in the inner top of the sliding groove (212); a sensing base point P of the distance sensor (213) is located at the outer top of the sliding block (211); and a maximum distance H between the bottom surface of the distance sensor (213) and the top surface of the sliding block (211) is 1 / 40. max It is consistent with the assembly length L between the valve stem (500) and the valve core (600).

5. The stop valve stem and valve core synchronous assembly machine according to claim 3, characterized in that: The outer portion of the limit plate (204) is provided with a self-lubricating mechanism (700) for lubricating the assembly position of the valve stem (500), the self-lubricating mechanism (700) comprising an annular groove (701) provided on the top of the limit plate (204), the inner portion of the annular groove (701) being symmetrically rotatably connected to a rotating shaft (702), and the outer portions of the symmetrical rotating shafts (702) are both fixedly connected to lubricating cotton rollers (703); The self-lubricating mechanism (700) further comprises a silo (704) symmetrically fixedly connected to the outside of the limit plate (204); a grease column (705) in contact with the lubricating cotton roller (703) is placed inside the silo (704); an opening (706) is provided on the outside of the silo (704) and is fixedly connected to an L-shaped fixing plate (707); a clamping spring (708) passing through the opening (706) and in contact with the grease column (705) is fixedly connected to the inner side of the L-shaped fixing plate (707).

6. A stop valve stem and valve core synchronous assembly machine according to claim 5, characterized in that: The self-lubricating mechanism (700) further comprises an empty groove (709) provided inside the limiting plate (204), the top of the empty groove (709) being connected to the bottom of the annular groove (701), a fixed shaft (710) being fixedly connected to the middle of the empty groove (709), the fixed shaft (710) being rotatably connected to a rotating cylinder (711) outside, the rotating cylinder (711) being fixedly connected to an upper connecting disk body (712) and a lower connecting gear (713) outside, the rotating shaft (702) being rotatably connected to the inside of the upper connecting disk body (712) and having a meshing gear (714) fixedly connected to the bottom, the meshing gear (714) being symmetrically meshedly connected to an inner gear ring (715) fixedly connected to the inside of the empty groove (709) outside, and the lower connecting gear (713) being meshedly connected to a meshing gear rod (716) slidably connected to the inside of the empty groove (709) outside.

7. A stop valve stem and valve core synchronous assembly machine according to claim 6, characterized in that: The self-lubricating mechanism (700) further comprises a T-shaped groove (717) symmetrically arranged on the top of the upper movable work block (232) and a through groove (718) symmetrically arranged on the top of the upper fixed work block (233); The limit plate (204) is symmetrically fixedly connected inside with a pneumatic cylinder (719) fixedly connected to the middle connecting plate (207) and extending into the through groove (718); one end of the pneumatic cylinder (719) is symmetrically provided inside with a piston connecting rod (720); one of the piston connecting rods (720) is fixedly connected to the meshing gear rod (716); the other end of the pneumatic cylinder (719) is symmetrically provided inside with a piston abutment rod (721); the end of the symmetrical piston abutment rod (721) away from the through groove (718) is fixedly connected with a T-shaped block (722) slidably connected to the inside of the T-shaped groove (717).

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