Large-diameter butterfly valve stem assembling and disassembling machine

Abstract

The application relates to the technical field of butterfly valve rod assembling and disassembling, and discloses a large-diameter butterfly valve rod assembling and disassembling machine, which comprises a base, a support fixedly installed at the top of the base, a assembling and disassembling mechanism, a fixing device, a butterfly valve connected to the tail end of the fixing device, a clamping device installed at the top of the butterfly valve, the clamping device comprising a first hydraulic rod, the first hydraulic rod being installed at the top of the support, a first connecting rod fixedly connected to the top of the first hydraulic rod, a self-locking mechanism fixedly installed on the first connecting rod, a bolt assembling and disassembling mechanism installed at the bottom of the clamping device, a nut fixing mechanism installed at the bottom of the bolt assembling and disassembling mechanism, a butterfly plate assembling and disassembling device fixedly installed at the right side of the butterfly valve, the bolt assembling and disassembling mechanism and the nut fixing mechanism can be matched with each other, the upper cover can be guaranteed to be uniformly stressed, the shaft body cannot be offset, and the possibility of the shaft body damaging the inner wall of the shell and the butterfly plate can be reduced.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve stem assembly and disassembly technology, and more specifically, to a large-diameter butterfly valve stem assembly and disassembly machine. Background Technology

[0002] A butterfly valve, also known as a throttling valve, is a type of valve that uses a butterfly-shaped disc as its closing element to rotate around a valve shaft to open and close. It is mainly used for shut-off and throttling in pipelines.

[0003] The butterfly valve's opening and closing component is a disc-shaped disc. Upper and lower shafts control the disc's rotation around its own axis within the valve body, achieving opening, closing, or adjustment. During the production or repair of large butterfly valves, the upper and lower shafts need to be clamped and placed on the same axis within the housing along the clamping plate. Traditional disassembly and assembly machines typically install or remove bolts diagonally one by one to complete the assembly and disassembly of the upper and lower covers. However, during this process, the shafts may experience uneven stress due to the pressure from the upper and lower covers, causing them to tilt inside the housing and disc, scratching the inner wall and affecting product performance. Furthermore, installing or removing bolts diagonally requires constant screwing in and out to ensure even stress distribution, increasing time and reducing work efficiency. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a large-diameter butterfly valve stem assembly and disassembly machine, which has the advantages of stabilizing the shaft and improving assembly and disassembly efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a large-diameter butterfly valve stem installation and removal machine, comprising a base, a bracket fixedly installed on the top of the base, and an installation and removal mechanism, the installation and removal mechanism comprising a fixing device, the tail end of the fixing device being connected to a butterfly valve, a clamping device being installed on the top of the butterfly valve, the clamping device comprising a first hydraulic rod, the first hydraulic rod being installed on the top of the bracket, a first connecting rod being fixedly connected to the top of the first hydraulic rod, a self-locking mechanism being fixedly installed on the top of the first connecting rod, a bolt installation and removal mechanism being installed at the bottom of the clamping device, a nut fixing mechanism being installed at the bottom of the bolt installation and removal mechanism, and a butterfly plate installation and removal device being fixedly installed on the right side of the butterfly valve.

[0006] As a preferred embodiment of the present invention, the fixing device includes a first telescopic rod, which is installed on the inner side of the bracket. A lifting lug is fixedly connected to the tail end of the first telescopic rod, and a hydraulic column is fixedly connected to the bottom of the lifting lug. The number of the first telescopic rod, the lifting lug, and the hydraulic column is four sets.

[0007] As a preferred embodiment of the present invention, a rubber strip is fixedly installed on the inner outer edge of the right clamping block, a motor is installed on the right side of the right clamping block, a screw is installed on the output shaft of the motor, a left clamping block is installed on the left side of the right clamping block, and a threaded hole is provided on the left clamping block.

[0008] As a preferred embodiment of the present invention, the bolt mounting and dismounting mechanism includes a slider, which is mounted on a bracket. A second connecting rod is fixedly connected to the top of the slider, a first rotary motor is mounted on the second connecting rod, a fixing plate is fixedly connected to the tail end of the second connecting rod, an electric sleeve is fixedly mounted at the bottom of the fixing plate, and a push rod is installed inside the electric sleeve.

[0009] As a preferred embodiment of the present invention, the nut fixing mechanism includes a third connecting rod, which is mounted on a bracket. A second rotary motor is mounted on the third connecting rod, and a second telescopic rod is mounted at the tail end of the third connecting rod. An arc-shaped plate is fixedly connected to the tail end of the second telescopic rod, and a first clamp is fixedly mounted on the inner edge of the arc-shaped plate.

[0010] As a preferred embodiment of the present invention, the butterfly plate mounting and disassembly device includes a third rotary motor, which is mounted on the top of the base. A longitudinal column is mounted on the third rotary motor, and a second hydraulic rod is fixedly connected to the left edge of the longitudinal column. A connecting block is fixedly connected to the tail end of the second hydraulic rod, and a second gripper is mounted on the left side of the connecting block.

[0011] As a preferred embodiment of the present invention, the butterfly valve includes a housing with a circular hole. A butterfly plate is installed inside the housing. An upper bushing is fixedly connected to the bottom of the housing. A washer is installed on the upper bushing. A top cover is installed on the top of the washer. A bolt is installed on the top cover. An upper shaft body is sleeved inside the upper bushing. A lower bushing is fixedly connected to the bottom of the housing. A lower shaft body is sleeved inside the lower bushing. A crescent ring is engaged at the bottom outer edge of the lower shaft body. A lower cover is installed at the bottom of the lower bushing.

[0012] As a preferred embodiment of the present invention, the number of the motor, screw and threaded hole is two sets, and the threaded hole is opened on the same axis as the screw. A rubber strip is also installed on the inner outer edge of the left clamping block.

[0013] As a preferred embodiment of the present invention, the upper shaft body and the washer are bolted together to install the upper cover on the top of the upper shaft sleeve, the bottom of the upper shaft body is connected to the top of the butterfly plate, the lower shaft body and the crescent ring are bolted together to install the lower cover on the bottom of the lower shaft sleeve, and the top of the lower shaft body is connected to the bottom of the butterfly plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This invention utilizes a bolt installation / removal mechanism and a nut fixing mechanism in cooperation. The first rotary motor and the second connecting rod move the fixing plate up and down along the axis of the upper cover, allowing the required bolts to be installed in the electric sleeve. The clamp can fix the nut, and the electric sleeve can screw in the bolts. This ensures that the upper cover is uniformly stressed and does not cause the shaft to shift, thus preventing damage to the inner walls of the housing and the disc plate. Furthermore, the two devices are also suitable for disassembly work, and working together can speed up assembly time and improve work efficiency.

[0016] 2. The present invention uses an improved clamping device to lock and clamp the upper shaft in the middle using left and right clamping blocks. The rubber strip can ensure that the outer surface of the upper shaft will not be damaged. The first hydraulic rod and the first connecting rod can slowly move the upper shaft upward or downward on its axis of motion, so that the upper shaft can be smoothly installed into the butterfly plate through the housing. The improved clamping device can achieve greater stability without damaging the upper shaft, so that the upper shaft can complete the installation process stably and at the appropriate angle.

[0017] 3. The present invention uses a fixing device with lifting lugs to fix the butterfly valve. After the hydraulic column is activated, the cylinder on it is pushed out under the action of hydraulic pressure and snaps into the round hole opened on the shell. The four sets of lifting lugs and hydraulic column can stabilize the butterfly valve on the base and bracket. A new fixing device is designed according to the shell characteristics of the butterfly valve, which is more convenient for installation and disassembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a top view of the overall structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the fixing device structure of this invention;

[0021] Figure 4 This is a side view of the overall structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the upper cover structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the lower cover structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the self-locking mechanism of the present invention;

[0025] Figure 8This is a schematic diagram of the bolt assembly / disassembly mechanism of the present invention;

[0026] Figure 9 This is a schematic diagram of the self-nut fixing mechanism of the present invention;

[0027] Figure 10 This is a schematic diagram of the butterfly valve structure of the present invention.

[0028] In the diagram: 1. Base; 2. Bracket; 3. Fixing device; 4. Clamping device; 5. Bolt installation and removal mechanism; 6. Nut fixing mechanism; 7. Butterfly plate installation and removal device; 8. Butterfly valve; 301. First telescopic rod; 302. Lifting lug; 303. Hydraulic column; 401. First hydraulic rod; 402. First connecting rod; 403. Self-locking mechanism; 4031. Right clamping block; 4032. Rubber strip; 4033. Motor; 4034. Screw; 4035. Left clamping block; 4036. Threaded hole; 501. Slider; 502. Second connecting rod; 503. First rotary motor; 504. Fixing device; 505. Fixed plate; 506. Electric sleeve; 607. Push rod; 608. Third connecting rod; 609. Second rotary motor; 600. Second telescopic rod; 600. Arc plate; 601. First gripper; 702. Third rotary motor; 703. Longitudinal column; 704. Second hydraulic rod; 705. Connecting block; 706. Second gripper; 801. Housing; 8011. Round hole; 802. Butterfly plate; 803. Upper bushing; 804. Washer; 805. Upper cover; 806. Bolt; 807. Upper shaft body; 808. Lower bushing; 809. Crescent ring; 810. Lower cover; 811. Lower shaft body. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1 - Figure 10As shown, the large-diameter butterfly valve stem installation and removal machine of this embodiment includes a base 1, a bracket 2 fixedly installed on the top of the base 1, and an installation and removal mechanism. The installation and removal mechanism includes a fixing device 3, which includes a first telescopic rod 301. The first telescopic rod 301 is installed inside the bracket 2, and a lifting lug 302 is fixedly connected to the tail end of the first telescopic rod 301. A hydraulic column 303 is fixedly connected to the bottom of the lifting lug 302. The number of the first telescopic rod 301, the lifting lug 302, and the hydraulic column 303 is four sets. The tail end is connected to a butterfly valve 8, and a clamping device 4 is installed on the top of the butterfly valve 8. The clamping device 4 includes a first hydraulic rod 401, which is installed on the top of the bracket 2. A first connecting rod 402 is fixedly connected to the top of the first hydraulic rod 401. A self-locking mechanism 403 is fixedly installed on the top of the first connecting rod 402. A bolt mounting and dismounting mechanism 5 is installed at the bottom of the clamping device 4. A nut fixing mechanism 6 is installed at the bottom of the bolt mounting and dismounting mechanism 5. A butterfly plate mounting and dismounting device 7 is fixedly installed on the right side of the butterfly valve 8.

[0031] The butterfly valve 8 is fixed by the lugs 302 and hydraulic column 303 on the fixing device 3. When the hydraulic column 303 is activated, the cylinder is pushed out and snapped into the round hole 8011 opened on the housing 801. The four sets of lugs 302 and hydraulic column 303 can stabilize the butterfly valve 8 on the base 1 and the bracket 2.

[0032] The self-locking mechanism 403 includes a right clamping block 4031, a rubber strip 4032 fixedly installed on the inner outer edge of the right clamping block 4031, a motor 4033 installed on the right side of the right clamping block 4031, a screw 4034 installed on the output shaft of the motor 4033, a left clamping block 4035 installed on the left side of the right clamping block 4031, and a threaded hole 4036 opened on the left clamping block 4035. There are two sets of motor 4033, screw 4034 and threaded hole 4036, and the threaded hole 4036 is opened on the same axis as the screw 4034. The rubber strip 4032 is also installed on the inner outer edge of the left clamping block 4035.

[0033] By starting the motor 4033, the screw 4034 is driven to screw into the threaded hole 4036 of the left clamping block 4035. The left clamping block 4035 and the right clamping block 4031 lock and clamp the upper shaft 807 in the middle. The rubber strip 4032 can ensure that the outer surface of the upper shaft 807 will not be damaged.

[0034] The bolt mounting and dismounting mechanism 5 includes a slider 501, which is mounted on the bracket 2. A second connecting rod 502 is fixedly connected to the top of the slider 501. A first rotary motor 503 is mounted on the second connecting rod 502. A fixing plate 504 is fixedly connected to the tail end of the second connecting rod 502. An electric sleeve 505 is fixedly installed at the bottom of the fixing plate 504. A push rod 506 is installed inside the electric sleeve 505.

[0035] The slider 501 can make the device move upward on the bracket 2, the electric sleeve 505 can be started to tighten the bolt 806, and the bolt 806 can be unscrewed by driving the electric sleeve 505 to rotate in the opposite direction. The push rod 506 installed in the electric sleeve 505 can also push out the unscrewed bolt 806.

[0036] The nut fixing mechanism 6 includes a third connecting rod 601, which is mounted on the bracket 2. A second rotary motor 602 is mounted on the third connecting rod 601. A second telescopic rod 603 is mounted on the tail end of the third connecting rod 601. An arc-shaped plate 604 is fixedly connected to the tail end of the second telescopic rod 603. A first clamp 605 is fixedly mounted on the inner edge of the arc-shaped plate 604.

[0037] By cooperating with the third connecting rod 601, the second rotary motor 602, and the second telescopic rod 603, the nut gripped in the first clamp 605 can be moved to a position below the hole opened on the upper bushing 803.

[0038] The butterfly plate mounting and disassembly device 7 includes a third rotary motor 701, which is mounted on the top of the base 1. A longitudinal column 702 is mounted on the third rotary motor 701. A second hydraulic rod 703 is fixedly connected to the left edge of the longitudinal column 702. A connecting block 704 is fixedly connected to the tail end of the second hydraulic rod 703. A second gripper 705 is mounted on the left side of the connecting block 704.

[0039] After the butterfly plate 802 is gripped by the second gripper 705, it can be transported into the housing 801 by the cooperation of the third rotary motor 701 and the second hydraulic rod 703.

[0040] The butterfly valve 8 includes a housing 801 with a circular hole 8011. A butterfly plate 802 is installed inside the housing 801. An upper bushing 803 is fixedly connected to the bottom of the housing 801. A washer 804 is installed on the upper bushing 803. An upper cover 805 is installed on the top of the washer 804. A bolt 806 is installed on the upper cover 805. An upper shaft body 807 is sleeved inside the upper bushing 803. A lower bushing 808 is fixedly connected to the bottom of the housing 801. A lower shaft body 807 is sleeved inside the lower bushing 808. The lower shaft body 811 has a crescent ring 809 snapped onto its bottom outer edge. The bottom of the lower shaft sleeve 808 is fitted with a lower cover 810. The upper shaft body 807 and the washer 804 are bolted together with the upper cover 805 and mounted on the top of the upper shaft sleeve 803. The bottom of the upper shaft body 807 is connected to the top of the butterfly plate 802. The lower shaft body 811 and the crescent ring 809 are bolted together with the lower cover 810 and mounted on the bottom of the lower shaft sleeve 808. The top of the lower shaft body 811 is connected to the bottom of the butterfly plate 802.

[0041] By moving the slider 501 downwards, the bolt 806 can pass through the holes opened on the upper cover 805 and the upper bushing 803. At this time, the nut fixing mechanism 6 is activated. Through the cooperation of the third connecting rod 601, the second rotary motor 602 and the second telescopic rod 603, the nut held in the first gripper 605 is moved to a position below the hole opened on the upper bushing 803. At this time, the electric sleeve 505 is activated to tighten the bolt 806, so that the upper shaft 807 can be installed in the housing 801 and the butterfly plate 802.

[0042] Working principle and usage process of this invention:

[0043] When installing the valve stem using this invention, the butterfly valve 8 is first fixed by the lifting lugs 302 and hydraulic column 303 on the fixing device 3. The hydraulic column 303 is activated, and the cylinder is pushed out and snapped into the round hole 8011 opened on the housing 801. The four sets of lifting lugs 302 and hydraulic column 303 can stabilize the butterfly valve 8 on the base 1 and bracket 2. At this time, the butterfly plate mounting and disassembly device 7 is activated. After the butterfly plate 802 is clamped by the second gripper 705, the butterfly plate 802 is transported to the designated position inside the housing 801 by the cooperation of the third rotary motor 701 and the second hydraulic rod 703, and then stopped, ensuring that the hole position of the butterfly plate 802 and the upper bushing 803 and lower bushing 808 of the housing 801 are on the same axis.

[0044] At this time, the clamping device 4 is activated again. The motor 4033 on the right clamping block 4031 of the self-locking mechanism 403 starts and drives the screw 4034 to screw into the threaded hole 4036 of the left clamping block 4035. The left clamping block 4035 and the right clamping block 4031 lock and clamp the upper shaft 807 in the middle. The rubber strip 4032 can ensure that the outer surface of the upper shaft 807 will not be damaged. The upper shaft 807 is slowly transported downward through the first hydraulic rod 401 and the first connecting rod 402, so that it can move downward along the axis in the upper shaft sleeve 803. The upper shaft 807 passes through the upper shaft sleeve 803 and is inserted into the inside of the butterfly plate 802. The first hydraulic rod 401 is stopped. At this time, the washer 804 is put on the upper shaft 807 and the upper cover 805 is installed.

[0045] Then, the bolt installation and removal mechanism 5 is activated. The slider 501 can make the device move upward on the bracket 2. After moving to a position higher than the upper cover 805, it stops. Then, the first rotary motor 503 is activated. The fixing plate 504 is moved to the axial position of the upper cover 805 through the second connecting rod 502 and then stops. The required bolt 806 is installed in the electric sleeve 505. The bottom of the electric sleeve 505 can hold the bolt 806. Then, the slider 501 is moved downward so that the bolt 806 can pass through the holes opened on the upper cover 805 and the upper bushing 803. At this time, the nut fixing mechanism 6 is activated. Through the cooperation of the third connecting rod 601, the second rotary motor 602 and the second telescopic rod 603, the nut held in the first gripper 605 is moved to a position below the hole opened on the upper bushing 803. At this time, the electric sleeve 505 is activated to tighten the bolt 806 so that the upper shaft 807 can be installed in the housing 801 and the butterfly plate 802. The gripping device 4 is then removed.

[0046] The operator then uses a hydraulic jack to insert the lower shaft 811 into the lower bushing 808. After installing the crescent ring 809, the lower shaft 811 is installed in the lower bushing 808 and the lower cover 810 using the bolt installation and removal mechanism 5 and the nut fixing mechanism 6. The bolts 806, which are screwed in simultaneously by the bolt installation and removal mechanism 5, ensure that the upper cover 805 and the lower cover 810 are subjected to uniform force when the covers are closed, and will not cause the shaft to shift, resulting in damage to the inner walls of the housing 801 and the butterfly plate 802. In addition, this assembly method can also speed up the assembly time.

[0047] When the valve stem needs to be disassembled, simply fix the nuts of the upper cover 805 and lower cover 810 of the butterfly valve 8 using the nut fixing mechanism 6, then start the bolt installation and removal mechanism 5. Simultaneously unscrew the bolt 806 using the electric sleeve 505. The push rod 506 installed inside the electric sleeve 505 can also push out the unscrewed bolt 806. Using the clamping device 4, the upper shaft 807 can be pulled out of the housing 801. Unscrew the lower cover 810, and the lower shaft 811 can be moved out of the butterfly plate 802 under the action of gravity. Then, the butterfly plate 802 can be moved out of the housing 801 using the butterfly plate installation and removal device 7. At this point, the disassembly work is completed.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter butterfly valve stem assembly and disassembly machine, comprising a base (1), characterized in that: The base (1) is fixedly mounted with a bracket (2) on its top, and also includes The assembly and disassembly mechanism includes a fixing device (3), the tail end of which is connected to a butterfly valve (8), and a clamping device (4) is installed on the top of the butterfly valve (8). The clamping device (4) includes a first hydraulic rod (401), which is installed on the top of the bracket (2). A first connecting rod (402) is fixedly connected to the top of the first hydraulic rod (401), and a self-locking mechanism (403) is fixedly installed on the top of the first connecting rod (402). A bolt assembly and disassembly mechanism (5) is installed at the bottom of the clamping device (4), and a nut fixing mechanism (6) is installed at the bottom of the bolt assembly and disassembly mechanism (5). A butterfly plate assembly and disassembly device (7) is fixedly installed on the right side of the butterfly valve (8). The self-locking mechanism (403) includes a right clamping block (4031), a rubber strip (4032) is fixedly installed on the inner outer edge of the right clamping block (4031), a motor (4033) is installed on the right side of the right clamping block (4031), a screw (4034) is installed on the output shaft of the motor (4033), a left clamping block (4035) is installed on the left side of the right clamping block (4031), and a threaded hole (4036) is provided on the left clamping block (4035). There are two sets of motor (4033), screw (4034) and threaded hole (4036), and the threaded hole (4036) is opened on the same axis as the screw (4034). A rubber strip (4032) is also installed on the inner outer edge of the left clamping block (4035).

2. The large-diameter butterfly valve stem assembly and disassembly machine according to claim 1, characterized in that: The fixing device (3) includes a first telescopic rod (301), which is installed on the inner side of the bracket (2). The tail end of the first telescopic rod (301) is fixedly connected to a lifting lug (302), and the bottom of the lifting lug (302) is fixedly connected to a hydraulic column (303). The number of the first telescopic rod (301), the lifting lug (302) and the hydraulic column (303) are all four sets.

3. The large-diameter butterfly valve stem assembly and disassembly machine according to claim 1, characterized in that: The bolt mounting and dismounting mechanism (5) includes a slider (501), which is mounted on a bracket (2). A second connecting rod (502) is fixedly connected to the top of the slider (501). A first rotary motor (503) is mounted on the second connecting rod (502). A fixing plate (504) is fixedly connected to the tail end of the second connecting rod (502). An electric sleeve (505) is fixedly installed at the bottom of the fixing plate (504). A push rod (506) is installed inside the electric sleeve (505).

4. The large-diameter butterfly valve stem assembly and disassembly machine according to claim 1, characterized in that: The nut fixing mechanism (6) includes a third connecting rod (601), which is mounted on the bracket (2). A second rotary motor (602) is mounted on the third connecting rod (601). A second telescopic rod (603) is mounted on the tail end of the third connecting rod (601). An arc plate (604) is fixedly connected to the tail end of the second telescopic rod (603). A first clamp (605) is fixedly mounted on the inner edge of the arc plate (604).

5. The large-diameter butterfly valve stem assembly and disassembly machine according to claim 1, characterized in that: The butterfly plate mounting and disassembly device (7) includes a third rotary motor (701), which is mounted on the top of the base (1). A longitudinal column (702) is mounted on the third rotary motor (701). A second hydraulic rod (703) is fixedly connected to the left edge of the longitudinal column (702). A connecting block (704) is fixedly connected to the tail end of the second hydraulic rod (703). A second gripper (705) is mounted on the left side of the connecting block (704).

6. The large-diameter butterfly valve stem assembly and disassembly machine according to claim 1, characterized in that: The butterfly valve (8) includes a housing (801), a circular hole (8011) is provided on the housing (801), a butterfly plate (802) is installed inside the housing (801), an upper bushing (803) is fixedly connected to the bottom of the housing (801), a washer (804) is installed on the upper bushing (803), a top cover (805) is installed on the top of the washer (804), a bolt (806) is installed on the top cover (805), an upper shaft body (807) is sleeved inside the upper bushing (803), a lower bushing (808) is fixedly connected to the bottom of the housing (801), a lower shaft body (811) is sleeved inside the lower bushing (808), a crescent ring (809) is snapped onto the bottom outer edge of the lower shaft body (811), and a lower cover (810) is installed at the bottom of the lower bushing (808).

7. A large-diameter butterfly valve stem assembly and disassembly machine according to claim 6, characterized in that: The upper shaft (807) and washer (804) are bolted (806) to install the upper cover (805) on the top of the upper shaft sleeve (803). The bottom of the upper shaft (807) is connected to the top of the butterfly plate (802). The lower shaft (811) and crescent ring (809) are bolted (806) to install the lower cover (810) on the bottom of the lower shaft sleeve (808). The top of the lower shaft (811) is connected to the bottom of the butterfly plate (802).

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