Electric head worm centering fixing support device and method thereof

Abstract

The application belongs to the technical field of mechanical assembly, and discloses a motor head worm centering fixing support device and a method thereof. The device comprises a support column, a limiting block, a movable support rod, a first pin and a base. The support column is located above the base. The movable support rod is located on both sides of the support column and the base. The movable support rod is installed on the support column and the base through the first pin. The movable support rod is movable relative to the support column and the base, and is used for supporting the support column and supporting the forward and backward movement of the support column relative to the base. The device comprises at least two pairs of movable support rods. The limiting block is located above the support column and is movably installed on the support column, and is used for limiting and fixing the worm. The device is stable and reliable in structure, simple in use method, and can quickly and accurately complete the worm centering and the worm assembly, effectively shorten the working time of the motor head disassembly overhaul, and avoid the potential risk of threatening the safety of personnel and equipment in the maintenance process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical assembly, and particularly relates to an electric head worm centering and fixing support device and a method thereof. BACKGROUND

[0002] Two WWER-1000 type units of a first-stage project of a certain nuclear power plant are installed with 1238 Б, В, Г, and Д type switch valve electric heads. The working principles of the four types of electric heads are that a gear on a motor transmission of the electric head drives a set of bridge gears, the bridge gears drive driven gears, the driven gears are installed on a worm, and the worm drives a worm gear to rotate, thereby driving a main shaft to rotate. When manually operated, a hand wheel is directly connected with the worm together to drive the worm gear to rotate, thereby realizing the switching of the valve.

[0003] The four types of electric heads all adopt worm and worm gear transmission, the worm and worm gear transmission can obtain a large transmission ratio, is more compact than the staggered shaft helical gear mechanism, the linear contact between the meshing tooth surfaces of the two wheels is much higher than that of the staggered shaft helical gear mechanism. At the same time, the worm transmission is equivalent to a spiral transmission, which is a multi-tooth meshing transmission, so the transmission is stable and the noise is very small. When the lead angle of the worm is less than the equivalent friction angle between the meshing teeth, the mechanism has self-locking property, and can realize reverse self-locking, i.e. only the worm can drive the worm gear, but the worm gear cannot drive the worm; the axial force of the worm is large.

[0004] The worm and worm gear transmission has some shortcomings in addition to the above-mentioned advantages, such as low transmission efficiency and serious wear. When the worm and worm gear meshing transmission, the relative sliding speed between the meshing teeth is large, so the friction loss is large and the efficiency is low. On the other hand, the large relative sliding speed causes serious wear and serious heating of the tooth surface. In order to dissipate heat and reduce wear, expensive materials with good friction reduction and wear resistance and good lubrication devices are often used, so the assembly requirements for the worm and worm gear are also relatively high. The matching meshing requirements of the worm and worm gear are high. If the worm and worm gear are not correctly assembled, the worm and worm gear will be seriously worn, the electric head transmission will be jammed, and the safe and stable operation of the system will be affected. Therefore, the assembly quality of the worm and worm gear is particularly important.

[0005] During the disassembly and overhaul process of the electric head, the worm and worm gear need to be disassembled and taken out, cleaned and then checked for worm and worm gear wear. After passing the inspection, the worm and worm gear are reassembled. The whole disassembly and assembly process usually needs 3-4 people to cooperate to complete the disassembly and assembly. During the reassembly process of the worm and worm gear, due to the small internal space of the electric head box, there is no suitable tool to correctly center and reassemble the worm. After the worm is reassembled to the inside of the box, the worm hand wheel end is first reassembled and fixed, then the worm bearing end exposed outside the box is lifted with a thin rope, the worm is centered as much as possible, and then the worm is centered by tightening the worm bearing gland. Each time the worm is centered and reassembled by tightening the worm bearing gland. During the reassembly process of the worm, the thin rope is easily broken, causing damage to the equipment and personnel, and the worm and worm gear assembly is easily assembled, causing transmission jamming, which still needs to be repeatedly disassembled and assembled. The whole process is time-consuming and laborious, and the work efficiency is low.

[0006] Therefore, it is urgent to develop an electric head worm centering and fixing support device to solve the problem of incorrect centering during the reassembly process of the worm, and to ensure the assembly quality of the worm and worm gear. SUMMARY

[0007] The purpose of the present application is to provide an electric head worm centering and fixing support device and method, which is stable and reliable in structure, simple in use, can quickly and accurately complete the centering of the worm, complete the assembly of the worm, effectively shorten the working time of the electric head disassembly and overhaul, and avoid the potential risk of threatening personnel and equipment safety during the maintenance process.

[0008] The technical solution to achieve the purpose of the present application is:

[0009] An electric head worm centering and fixing support device, the device comprises: a support column, a limiting block, a movable support rod, a first pin and a base, the support column is located above the base, the movable support rod is located on both sides of the support column and the base, the movable support rod is installed on the support column and the base through the first pin, the movable support rod is movable relative to the support column and the base, and is used for supporting the support column and enabling the support column to move forward and backward relative to the base, the device comprises at least two pairs of movable support rods; the limiting block is located above the support column, and the limiting block is movably installed on the support column and used for limiting and fixing the worm.

[0010] The device further comprises an adjusting support rod, the adjusting support rod is located on both sides of the support column and the base, and the adjusting support rod is located on one side of all the movable support rods, the adjusting support rod is installed on the base through a second pin, and is installed on the support column through an adjusting bolt and an adjusting nut, the adjusting support rod is adjustable relative to the support column, and is used for supporting the support column and adjusting the support column to a suitable position according to the centering position of the worm shaft in the shaft hole.

[0011] The device is provided with a through adjusting movable slot between the positions of the mounting movable support rod of the support column, the adjusting movable slot is matched with the limiting bolt, the limiting nut is matched with the limiting bolt, the limiting bolt installs the limiting block on the support column through the adjusting movable slot, the limiting bolt can move in the adjusting movable slot, and the limiting nut locks and fixes the limiting bolt and the limiting block on the support column.

[0012] The device is provided with a through movable fixing slot at the end of the support column away from the adjusting movable slot, the movable fixing slot is matched with the adjusting bolt, the adjusting nut is matched with the adjusting bolt, the upper end of the adjusting support rod is provided with a through adjusting slot, the adjusting bolt installs the adjusting support rod movably on the support column through the movable fixing slot on the support column and the adjusting slot on the adjusting support rod, and the adjusting bolt locks and fixes the adjusting support rod on the support column through the adjusting nut.

[0013] The device is fixedly connected with a handle at the end of the support column close to the movable fixing slot, and the handle is used for pulling the support column.

[0014] A method for worm centering and fixing of an electric head worm centering and fixing support device is adopted, and the method comprises the following steps:

[0015] Step (1): determining the position of the limiting block on the support column;

[0016] Step (2): reinstalling the worm into the electric head box body;

[0017] Step (3): placing the electric head worm centering and fixing support device into the box body;

[0018] Step (4): adjusting the support column so that the support column supports the worm;

[0019] Step (5): adjusting the centering position of the worm in the shaft hole by adjusting the support column and the base, and fixing the position of the adjusting support rod on the support column;

[0020] Step (6): fastening the worm bearing gland;

[0021] Step (7): taking out the electric head worm centering and fixing support device.

[0022] The step (1) is: adjusting the position of the limiting block on the support column according to the size of the worm shaft, and locking the limiting block on the support column by rotating the limiting nut.

[0023] The step (4) is: pulling the handle of the electric head worm centering and fixing support device backward, slowly lifting the support column, and clamping the worm shaft by the limiting block installed on the support column according to the distance adjusted in step (1), at this time, the support column supports the worm.

[0024] The step (5) is: adjusting the height position of the support column by pulling the handle to adjust the upper and lower positions of the worm in the shaft hole and adjusting the left and right positions of the worm in the shaft hole by adjusting the base position, and then adjusting the centering position of the worm in the shaft hole. After adjusting the centering position of the worm, reinstall the worm bearing cover on the outside of the electric head housing. After the whole process is smooth, insert the adjusting bolt into the movable fixing slot of the adjusting support rod and the support column adjusting support rod; rotate the adjusting nut to lock the adjusting support rod on the support column.

[0025] The beneficial technical effects of the present invention are:

[0026] 1. The electric head worm centering and fixing support device provided by the present invention has a simple, compact, small, stable structure, is easy to use and carry;

[0027] 2. The electric head worm centering and fixing support device provided by the present invention effectively solves the problem of worm and worm gear assembly, saves time and labor, and has high work efficiency;

[0028] 3. The electric head worm centering and fixing support device provided by the present invention has a limit block that is movable and adjustable, and is suitable for worms of different sizes;

[0029] 4. The electric head worm centering and fixing support device provided by the present invention is suitable for assembling the same worm and worm gear structure of different models of electric heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of a worm centering and fixing support device for an electric head provided by the present invention;

[0031] Figure 2 This is a working status diagram of the electric head worm centering and fixing support device provided by the present invention.

[0032] In the figure: 1-support column, 2-limit block, 3-limit nut, 4-limit bolt, 5-adjusting nut, 6-adjusting bolt, 7-movable support rod, 8-first pin, 9-base, 10-adjusting support rod, 11-second pin, 12-handle, 13-box, 14-worm. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, the present invention provides an electric head worm centering and fixing support device, including: a support column 1, a limit block 2, a limit nut 3, a limit bolt 4, an adjusting nut 5, an adjusting bolt 6, a movable support rod 7, a first pin 8, a base 9, an adjusting support rod 10, a second pin 11 and a handle 12.

[0035] The support column 1 is located above the base 9, and a through hole is correspondingly arranged at one end of the support column 1 and the base 9, and another through hole is correspondingly arranged at the middle position of the base 9 and the support column 1, which is matched with the first pin 8. The movable support rod 7 is located on both sides of the support column 1 and the base 9, and the movable support rod 7 located at the symmetrical position of the left and right sides of the support column 1 and the base 9 is a pair of movable support rods 7. The two first pins 8 install the pair of movable support rods 7 on the base 9 and the support column 1 through the through holes, and the movable support rod 7 is movable relative to the support column 1 and the base 9. The movable support rod 7 supports the support column 1 and can support the support column 1 to move forward and backward relative to the base 9 through the first pin 8. In this embodiment, the four movable support rods 7, i.e. two pairs of movable support rods 7, are installed on one end and the middle position of the base 9 and the support column 1 through four first pins 8.

[0036] The support column 1 is provided with a through adjusting movable slot between the two through holes at the end and the middle position, which is matched with the limiting bolt 4, and the limiting nut 3 is matched with the limiting bolt 4. The limiting block 2 is located above the support column 1 and is used for limiting and fixing the worm. The limiting bolt 4 installs the limiting block 2 on the support column 1 through the adjusting movable slot, the limiting bolt 4 can move forward and backward in the adjusting movable slot, and the limiting bolt 4 is locked and fixed on the support column 1 together with the limiting block 2 through the limiting nut 3. In this embodiment, one side surface of the limiting block 2 is a circular arc surface matched with the size of the worm shaft, and when the limiting block 2 is installed, the circular arc surfaces of the two limiting blocks 2 are oppositely and symmetrically installed. According to the size of the worm shaft, the positions of the two limiting blocks 2 on the support column 1 are adjusted through the two limiting nuts 3 and the two limiting bolts 4, and the two limiting blocks 2 are locked through the two rotating limiting nuts 3 respectively, so that the two limiting blocks 2 adjusted are just clamped on the worm shaft.

[0037] The other end of the support column 1 is provided with a through movable fixing slot, and the movable fixing slot is located on one side of the through hole provided on the middle of the support column 1 and away from the adjusting movable slot. The movable fixing slot is matched with the adjusting bolt 6, and the adjusting nut 5 is matched with the adjusting bolt 6. The adjusting support rods 10 are located on the two sides of the support column 1 and the base 9 respectively. The adjusting support rods 10 located on the symmetrical positions of the left and right sides of the support column 1 and the base 9 are a pair of adjusting support rods 10. The upper end of the adjusting support rod 10 is provided with a through adjusting slot. The adjusting bolt 6 is movably installed on the support column 1 through the movable fixing slot on the support column 1 and the adjusting slot on the adjusting support rod 10, and the adjusting bolt 6 is locked and fixed on the support column 1 together with the adjusting support rod 10 through the adjusting nut 5. The other end of the base 9 is provided with a through connecting hole matched with the second pin 11. The second pin 11 installs the adjusting support rod 10 on the base 9 through the connecting hole. The second pin 11 and the adjusting bolt 6 make the adjusting support rod 10 support the support column 1. The position of the support column 1 is adjusted to a suitable position according to the centering position of the worm shaft in the shaft hole. The position of the support column 1 is locked and fixed through the adjusting nut 5 and the adjusting bolt 6. In the embodiment, the two adjusting support rods 10 are installed on the other end of the support column 1 and the base 9 on the two sides respectively through the adjusting nut 5, the adjusting bolt 6 and the second pin 11.

[0038] The handle 12 is connected to the end of the support column 1 near the movable fixing slot through welding. The handle 12 is used to pull the support column 1. By pulling the handle 12, the height position of the support column 1 relative to the base 9 is adjusted to adjust the up-down position of the worm in the shaft hole.

[0039] The electric head worm centering and fixing support device provided by the application is used for worm centering and fixing, and specifically includes the following steps.

[0040] Step (1): determining the position of the limiting block 2 on the support column 1

[0041] According to the size of the worm shaft, the position of the limiting block 2 on the support column 1 is adjusted and locked through the rotating limiting nut 3.

[0042] Step (2): reinstalling the worm 14 into the electric head box body 13

[0043] The worm 14 is reinstalled into the electric head box body 13 and the worm hand wheel end is reinstalled and fixed.

[0044] Step (3): placing the electric head worm centering and fixing support device into the box body

[0045] The electric head worm centering and fixing support device is inserted into the box body near the worm bearing end.

[0046] Step (4): adjusting the support column 1 to support the worm

[0047] Pull back the electric head worm centering fixed support device handle 12, the support column 1 slowly rises, the two limiting blocks 2 installed on the support column 1 just block the worm shaft according to the interval size adjusted in step (1), at this time, the support column 1 supports the worm;

[0048] Step (5): adjust the centering position of the worm in the shaft hole by adjusting the support column 1 and the base 9, and fix the position of the adjusting support rod 10 on the support column 1

[0049] Adjust the height position of the support column 1 by pulling the handle 12 to adjust the up and down position of the worm in the shaft hole, and adjust the left and right position of the worm in the shaft hole by adjusting the position of the base 9, and then adjust the centering position of the worm in the shaft hole, after adjusting the centering position of the worm, put the worm bearing gland back outside the electric head box, and then insert the adjusting bolt 6 into the movable fixing groove of the adjusting support rod 10 and the support column 1 adjusting support rod 10;

[0050] Clockwise rotate the adjusting nut 5 to lock the adjusting support rod 10, and fix the adjusting support rod 10 on the support column 1 to support the support column 1;

[0051] Step (6): tighten the worm bearing gland;

[0052] Step (7): take out the electric head worm centering fixed support device.

[0053] The application has been described in detail above in combination with the drawings and examples, but the application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. The contents not described in detail in the application can adopt the existing technology.

Claims

1. A worm gear centering and fixing support device for an electric head, characterized in that: The device comprises: a support column (1), a limiting block (2), a movable support rod (7), a first pin (8) and a base (9); the support column (1) is located above the base (9); the movable support rod (7) is located on both sides of the support column (1) and the base (9); the movable support rod (7) is mounted on the support column (1) and the base (9) via the first pin (8); the movable support rod (7) is movable relative to the support column (1) and the base (9), and is used to support the support column (1) and can support the support column (1) to move forward and backward relative to the base (9); the device comprises at least two pairs of movable support rods (7); the limiting block (2) is located above the support column (1); the limiting block (2) is movably mounted on the support column (1) and is used to limit and fix the worm; The device further comprises an adjusting support rod (10), the adjusting support rod (10) being located on both sides of the support column (1) and the base (9), and the adjusting support rod (10) being located on one side of all movable support rods (7), the adjusting support rod (10) being mounted on the base (9) via a second pin (11), and being mounted on the support column (1) via an adjusting bolt (6) and an adjusting nut (5), the adjusting support rod (10) being adjustable relative to the support column (1), and being used for supporting the support column (1) and adjusting the support column (1) to a suitable position according to the centering position of the worm shaft in the shaft hole.

2. The electric head worm centering and fixing support device according to claim 1, characterized in that: The device is provided with a continuous adjustment movable groove between the positions of the support column (1) where the movable support rod (7) is installed. The adjustment movable groove matches the limit bolt (4), and the limit nut (3) matches the limit bolt (4). The limit bolt (4) installs the limit block (2) on the support column (1) through the adjustment movable groove. The limit bolt (4) can move in the adjustment movable groove. The limit nut (3) locks the limit bolt (4) and the limit block (2) on the support column (1).

3. The electric head worm centering and fixing support device according to claim 2, characterized in that: The device is provided with a through movable fixing groove at one end of the support column (1) away from the movable adjustment groove, the movable fixing groove matches the adjusting bolt (6), the adjusting nut (5) matches the adjusting bolt (6), the upper end of the adjusting support rod (10) is provided with a through adjusting groove, the adjusting bolt (6) is movably installed on the support column (1) through the movable fixing groove on the support column (1) and the adjusting groove on the adjusting support rod (10), and the adjusting bolt (6) is locked and fixed to the support column (1) together with the adjusting support rod (10) through the adjusting nut (5).

4. The electric head worm centering and fixing support device according to claim 3, characterized in that: The device is fixedly connected to a handle (12) at the end of the support column (1) close to the movable fixing groove, and the handle (12) is used to pull the support column (1).

5. A worm centering and fixing method, using the electric head worm centering and fixing support device according to claim 4, characterized in that: The method comprises the following steps: Step (1): Determine the position of the limit block (2) on the support column (1); Step (2): reinstall the worm (14) into the electric head housing (13); Step (3): Place the electric head worm centering and fixing support device into the box; Step (4): adjusting the support column (1) so that the support column (1) supports the worm; Step (5): by adjusting the support column (1) and the base (9), adjusting the centering position of the worm in the shaft hole, and fixing the position of the support rod (10) on the support column (1); Step (6): Tighten the worm bearing gland; Step (7): Take out the electric head worm gear centering and fixing support device.

6. A worm centering and fixing method according to claim 5, characterized in that: The step (1) comprises: adjusting the position of the limit block (2) on the support column (1) according to the size of the worm shaft and locking the limit block (2) on the support column (1) by rotating the limit nut (3).

7. A worm centering and fixing method according to claim 5, characterized in that: The step (4) is as follows: the handle (12) of the electric head worm centering fixed support device is pulled backward, the support column (1) is slowly raised, and the limit block (2) installed on the support column (1) clamps the worm shaft according to the spacing size adjusted in step (1). At this time, the support column (1) supports the worm.

8. A worm centering and fixing method according to claim 5, characterized in that: The step (5) is as follows: adjusting the height position of the support column (1) by pulling the handle (12) to adjust the upper and lower positions of the worm in the shaft hole and adjusting the left and right positions of the worm in the shaft hole by adjusting the position of the base (9), thereby adjusting the centering position of the worm in the shaft hole. After adjusting the centering position of the worm, reinstalling the worm bearing cover on the outside of the electric head housing. After the whole process is smooth, inserting the adjusting bolt (6) into the movable fixing groove of the adjusting support rod (10) and the supporting column (1); rotating the adjusting nut (5) to lock the adjusting support rod (10) on the supporting column (1).

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