Low-position hand-pushing device for main transformer low-pressure sleeve

Abstract

The utility model discloses a low-position hand-push device for a main transformer low-pressure sleeve, which comprises a chassis and a lifting system arranged on the chassis, two sides of the chassis are also provided with supporting mechanisms contacted with the ground, one end of the chassis is provided with a steering wheel mechanism, and the other end of the chassis is provided with a directional wheel mechanism; the supporting mechanism comprises a supporting arm and a linear sliding rail fixed to the chassis, one end of the supporting arm is installed in the linear sliding rail in a sliding mode, and the other end of the supporting arm is connected with a supporting leg making contact with the ground. The unfolding angle of the supporting mechanism can be adjusted according to the environment, the supporting mechanism can conveniently move in a narrow passageway of a transformer substation, the stability and smoothness of the whole moving process are guaranteed through the steering wheel mechanism and the directional wheel mechanism, and when the main transformer low-voltage sleeve is replaced, the supporting mechanism makes contact with the ground, and the whole stability is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of main transformer low-voltage bushing replacement, in particular to a low-position hand-pushing device for the main transformer low-voltage bushing. Background Art

[0002] At present, the main transformer low-voltage bushings used in substations are relatively large in size and heavy in weight. When the main transformer low-voltage bushings need to be replaced and installed, the narrow aisles in the substation site environment make it difficult for existing related mobile platforms to enter, and they cannot be well matched with the substation site environment and substation-related facilities, thus affecting construction. At the same time, due to the narrow aisles in the substation site environment, small operating devices shake greatly when replacing the main transformer low-voltage bushings, and their stability and safety are poor. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a low-position hand-push device for the main transformer low-voltage bushing. The support mechanism is in contact with the ground to ensure stability during the overall operation. At the same time, the support mechanism can be adjusted within a limited space so that it can be moved in the narrow aisles of the substation. The steering wheel mechanism and the directional wheel mechanism ensure stability and smoothness during the overall movement, so that the main transformer low-voltage bushing replacement operation can be carried out more flexibly and conveniently.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A low-position hand-pushing device for a main transformer low-voltage bushing comprises a chassis and a lifting system arranged on the chassis. Support mechanisms in contact with the ground are also installed on both sides of the chassis. A steering wheel mechanism is installed at one end of the chassis, and a directional wheel mechanism is installed at the other end.

[0006] The support mechanism includes a support arm and a linear slide rail fixed on the chassis. One end of the support arm is slidably installed in the linear slide rail, and the other end is connected to a support leg in contact with the ground.

[0007] In one embodiment, the steering wheel mechanism includes a U-shaped bracket and an L-bracket, a screw rod is rotatably installed in the U-shaped bracket through a shaft sleeve, and an anti-slip ring is detachably installed on the bottom end of the screw rod, and a coaxial shaft hole and a wire hole are penetrated through one end face of the L-bracket, and the inner diameter of the shaft hole is larger than the inner diameter of the wire hole, and steering wheels are rotatably installed on both sides of the L-bracket, one end of the screw rod is engaged with the internal thread of the wire hole, and the other end of the screw rod is rotatably extended from the U-shaped bracket, the anti-slip ring rotates and slides in the shaft hole, and the other end of the L-bracket is rotatably installed with a traction handle.

[0008] In one embodiment, the directional wheel mechanism includes a control box and an adjusting rod, a U-shaped frame 2 is fixedly installed at each end of the control box, a directional wheel group is slidably installed in each of the U-shaped frames 2, each of the directional wheel groups is rotatably connected to the control box, and the two directional wheel groups are connected by a gear synchronous belt transmission, and the gear synchronous belt is set in the control box. A cover plate is detachably installed on the control box, and the adjusting rod rotates through the cover plate and is connected to one of the directional wheel groups.

[0009] The directional wheel group includes a U-shaped frame three and a screw rod two, and a directional wheel is rotatably installed at the opening of the U-shaped frame three. One end of the screw rod two is threadedly connected to the horizontal plate of the U-shaped frame three, and both ends of the screw rod two leak out from both sides of the horizontal plate of the U-shaped frame three. An anti-drop cap is installed at the end of the screw rod two located below the horizontal plate of the U-shaped frame three, and a gear is installed at the end of the screw rod two located above the horizontal plate of the U-shaped frame three. The U-shaped frame three is slidably installed in the corresponding U-shaped frame two, and the gear synchronous belt is meshed with the corresponding gear.

[0010] In one embodiment, a T-shaped slide groove is provided on one side of the linear slide rail, and a rectangular slide groove is also provided on the upper surface of the linear slide rail. The rectangular slide groove and the T-shaped slide groove are connected to each other, and one end of the support arm is slidably connected to the T-shaped slide groove and the rectangular slide groove respectively.

[0011] In one embodiment, the support arm includes an arm rod and a U-shaped seat, a sleeve is fixedly installed on one end of the arm rod, an adjusting screw rod is installed on the circumference of the sleeve through a thread, one end of the adjusting screw rod is rotated and extended into the sleeve, and the other end of the arm rod is rotatably connected to the opening of the U-shaped seat, a T-shaped slider is fixedly installed on the outside of the U-shaped seat, a screw rod three is fixedly installed above the T-shaped slider, a nut is installed on the screw rod three through threaded engagement, the T-shaped slider is slidably installed in the T-shaped slide groove, the screw rod three is slidably installed in the rectangular slide groove, the top of the screw rod three leaks out of the rectangular slide groove, the nut is located above the outside of the rectangular slide groove, and the support leg is slidably installed in the corresponding sleeve.

[0012] In one embodiment, the support leg includes a pillar and a foot pad arranged at the bottom of the pillar, the top of the pillar is detachably installed with an anti-slip nut, the pillar is installed in a sleeve, and both ends of the pillar leak out from both ends of the sleeve, and the diameter of the anti-slip nut is larger than the inner diameter of the sleeve.

[0013] In one embodiment, the lifting system includes a first scissors-type support rod, a second scissors-type support rod, a third scissors-type support rod, a fourth scissors-type support rod, a fifth scissors-type support rod and a sixth scissors-type support rod that are sequentially stacked and rotatably connected, one side of the bottom of the first scissors-type support rod is rotatably connected to the chassis, and the other side of the bottom of the first scissors-type support rod is slidably connected to the chassis, one side of the top of the sixth scissors-type support rod is connected to the lifting platform, and the other side of the top of the sixth scissors-type support rod is slidably connected to the bottom surface of the lifting platform.

[0014] In one embodiment, a first double oil cylinder is fixedly installed between the first scissors support rod, the second scissors support rod and the third scissors support rod via a rotating seat and a connecting rod, and a second double oil cylinder is fixedly installed between the fourth scissors support rod, the fifth scissors support rod and the sixth scissors support rod via a rotating seat and a connecting rod, the hydraulic pump stations of the first double oil cylinder and the second double oil cylinder are both installed on the chassis, and a lock is fixedly installed at each end of the upper side of the lifting platform.

[0015] In one embodiment, the locker includes a rotating cylinder and a rotating arm, one end of the rotating arm is connected to the output end of the rotating cylinder, a latch is installed below the other end of the rotating arm, and the rotating cylinder is fixedly installed at one end above the lifting platform.

[0016] The beneficial effects of the present invention are:

[0017] (1) The support mechanism can adjust the deployment angle according to the environment, making it easy to move in the narrow aisles of the substation. The steering wheel mechanism and the directional wheel mechanism ensure the stability and smoothness of the overall movement. When replacing the low-voltage bushing of the main transformer, the support mechanism contacts the ground to ensure overall stability.

[0018] (2) Both the steering wheel and the directional wheel can be raised and lowered manually to ensure that the chassis is in full contact with the ground during operation, further improving overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0020] in:

[0021] Figure 1 A schematic diagram showing the structure of the present invention in one direction is shown;

[0022] Figure 2 It shows a schematic diagram of the structure of the utility model in another direction;

[0023] Figure 3 Shows a schematic structural diagram of the chassis of the present utility model;

[0024] Figure 4Shows a structural schematic diagram (exploded view) of the steering wheel mechanism of the present invention;

[0025] Figure 5 Shows a schematic structural diagram of the support mechanism of the present invention;

[0026] Figure 6 Shows a schematic structural diagram of the linear slide rail of the present invention;

[0027] Figure 7 Shows Figure 2 Schematic diagram of the local enlarged structure at A in the middle;

[0028] Figure 8 Shows Figure 6 Schematic diagram of the local enlarged structure at B in the middle;

[0029] Figure 9 Shows Figure 6 Schematic diagram of the local enlarged structure at C in the middle;

[0030] Figure 10 Shows Figure 2 Schematic diagram of the local enlarged structure at D in the middle;

[0031] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0032] Reference numerals:

[0033] 1-chassis, 2-steering wheel mechanism, 3-directional wheel mechanism, 4-linear slide, 5-support arm, 6-support leg, 7-lock, 8-first scissor support rod, 9-second scissor support rod, 10-third scissor support rod, 11-fourth scissor support rod, 12-fifth scissor support rod, 13-sixth scissor support rod, 14-lifting platform, 15-first double oil cylinder, 16-second double oil cylinder, 17-traction handle, 21-U-shaped bracket, 22-sleeve, 23-screw, 24-anti-slip ring, 25-L bracket, 26-shaft hole, 27-screw hole, 2 8-steering wheel, 30-cover, 31-control box, 32-U-shaped frame 2, 33-U-shaped frame 3, 34 directional wheel, 35-screw 2, 36-anti-drop cap, 37-gear, 38-gear timing belt, 39-adjusting rod, 41-T-type slide, 42-rectangular slide, 51-arm, 52-sleeve, 53-adjusting screw, 54-U-shaped seat, 55-T-type slider, 56-screw 3, 57-nut, 61-pillar, 62-foot pad, 63-anti-drop nut, 71-rotating cylinder, 72-rotating arm, 73-latch. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] The utility model provides a low-position hand-pushing device for the low-voltage bushing of the main transformer, such as Figure 1 and Figure 2 As shown, it includes a chassis 1, wherein: a steering wheel mechanism 2 is fixedly installed at one end of the chassis 1 to facilitate steering during the overall movement, and a directional wheel mechanism 3 is fixedly installed at the other end of the chassis 1 to cooperate with the steering wheel mechanism 2 to ensure stability and smoothness during the overall movement. A lifting system is movably installed on the chassis 1 to lift the main transformer low-voltage bushing; support mechanisms are fixedly installed on both sides of the chassis 1 so that when the lifting system lifts the main transformer low-voltage bushing, the support mechanisms are in contact with the ground to ensure stability during the overall operation.

[0036] In one embodiment, Figure 3 and Figure 4 As shown, the steering wheel mechanism 2 includes a U-shaped bracket 21 and an L bracket 25, and a screw rod 23 is rotatably installed in the U-shaped bracket 21 through a shaft sleeve 22, and the shaft sleeve 22 is detachably fixedly installed on the internal horizontal plate of the U-shaped bracket 21, so as to ensure the stability between the screw rod 23 and the U-shaped bracket 21 through the shaft sleeve 22, and the bottom end of the screw rod 23 is detachably fixedly installed with an anti-slip ring 24, and the setting of the anti-slip ring 24 can prevent the screw rod 23 from being separated from the L bracket 25; one end surface of the L bracket 25 is penetrated by a coaxial shaft hole 26 and a screw hole 27, and the shaft hole The inner diameter of 26 is larger than that of the thread hole 27. A steering wheel 28 is rotatably mounted on each side of the L-shaped bracket 25. One end of the screw rod 23 is engaged with the inner thread of the thread hole 27, and the other end of the screw rod 23 is rotated and extended from the U-shaped bracket 21, so that the height of the steering wheel 28 can be adjusted by rotating the screw rod 23. The anti-slip ring 24 rotates and slides in the shaft hole 26. The two steering wheels 28 are evenly distributed on both sides of the shaft hole 26 and the thread hole 27. The other end of the L-shaped bracket 25 is rotatably mounted with a traction handle 17, so that the traction handle 17 provides a force point for traction for the operator.

[0037] In one embodiment, Figure 7As shown, the directional wheel mechanism 3 includes a control box 31 and an adjusting rod 39, and a U-shaped frame 32 is fixedly installed at each end of the control box 31, and a directional wheel group is slidably installed in each U-shaped frame 32, so as to form a stable triangular support structure between the two directional wheel groups and the steering wheel mechanism 2; each directional wheel group is rotatably connected to the control box 31, and the two directional wheel groups are connected by a gear timing belt 38. The setting of the gear timing belt 38 allows the two directional wheel groups to be linked; the gear timing belt 38 is in the control box 31; a cover plate 30 is detachably fixedly installed on the control box 31, and the setting of the cover plate 30 allows the components inside the control box 31 to be inspected and repaired; the adjusting rod 39 rotates through the cover plate 30 and is fixedly connected to one of the directional wheel groups. The setting of the adjusting rod 39 can provide the required force point for adjusting the directional wheel group, and at the same time cooperate with the setting of the gear timing belt 38 to simultaneously adjust the height of the two directional wheel groups;

[0038] Specifically, the directional wheel group includes a U-shaped frame 33 and a screw rod 2 35, and the directional wheel 34 is rotatably installed at the opening of the U-shaped frame 33 to ensure the stability and smoothness of the directional wheel 34 during rotation; one end of the screw rod 2 35 is engaged with the cross plate of the U-shaped frame 33 by a thread, so that under the forward and reverse rotation of the screw rod 2 35, the directional wheel 34 is driven up and down by the U-shaped frame 33, and both ends of the screw rod 2 35 are leaked from both sides of the cross plate of the U-shaped frame 33; the screw rod 2 35 is in the U An anti-drop cap 36 is detachably fixedly mounted on one end below the horizontal plate of the U-shaped frame 33 to prevent the second screw rod 35 from detaching from the third U-shaped frame 33. A gear 37 is fixedly mounted on the end of the second screw rod 35 above the horizontal plate of the third U-shaped frame 33. The third U-shaped frame 33 is slidably mounted in the corresponding second U-shaped frame 32 so that when the height of the directional wheel 34 is adjusted, it can only move straight up and down. A gear timing belt 38 is meshed with the corresponding gear 37 to achieve linkage under the drive of the gear timing belt 38.

[0039] In one embodiment, Figure 3 、 Figure 5 as well as Figure 6 As shown, the support mechanism includes a linear slide 4 to provide the required adjustment space for the support arm 5, and the linear slide 4 is fixedly installed on one side of the chassis 1. Two support arms 5 are slidably installed on the linear slide 4 to adjust the position of the support legs 6 and support the support legs 6 to ensure the stability of the support legs 6; each support arm 5 is slidably installed with a support leg 6 at the other end so as to contact the ground and ensure stability during the lifting process. The arrangement of the structure between the linear slide 4 and the support arms 5 and the support legs 6 facilitates its deployment in the narrow aisles of the substation;

[0040] Specifically, a T-shaped slide groove 41 is provided on one side of the linear slide rail 4 to limit the support arm 5 and ensure the stability and smoothness of the support arm 5 during movement, and a rectangular slide groove 42 is provided on the upper surface of the linear slide rail 4 to limit the support arm 5 and prevent the support arm 5 from separating from the linear slide rail 4. The rectangular slide groove 42 is connected to the T-shaped slide groove 41; one end of the support arm 5 is slidably connected to the T-shaped slide groove 41 and the rectangular slide groove 42 respectively;

[0041] In one embodiment, Figure 8 As shown, the support arm 5 includes an arm rod 51 and a U-shaped seat 54, and a sleeve 52 is fixedly installed at one end of the arm rod 51. Through the setting of the sleeve 52, the support leg 6 can be supported and limited, and the support height of the support leg 6 can be adjusted conveniently. The circumference of the sleeve 52 is threadedly installed with an adjusting screw rod 53, so that the sleeve 52 and the support leg 6 can be locked by adjusting the screw rod 53; one end of the adjusting screw rod 53 is rotated and extended into the sleeve 52; the other end of the arm rod 51 is rotatably connected to the opening of the U-shaped seat 54, and through the setting of the U-shaped seat 54, the arm rod 51 can be rotated to adjust the support angle between the arm rod 51 and the chassis 1, and a T-shaped slider 55 is fixedly installed on the outside of the U-shaped seat 54. The support arm 5 is arranged so that the support arm 5 moves along the T-shaped slide 41 and prevents derailment. A screw rod 3 56 is fixedly installed above the T-shaped slider 55; the U-shaped seat 54 is between the corresponding two legs 6; a nut 57 is installed on the screw rod 3 56 through threaded engagement. By setting the screw rod 3 56 and the nut 57, when the support arm 5 is moved to the desired position, the U-shaped seat 54 and the linear slide 4 can be locked to ensure stability therebetween; the T-shaped slider 55 is slidably installed in the T-shaped slide 41; the screw rod 3 56 is slidably installed in the rectangular slide 42, and the top end of the screw rod 3 56 leaks out of the rectangular slide 42; the nut 57 is above the outer side of the rectangular slide 42; the support leg 6 is slidably installed in the corresponding sleeve 52;

[0042] Further, if Figure 9 As shown, the support leg 6 includes a pillar 61, and a foot pad 62 is fixedly installed at the bottom end of the pillar 61, and an anti-slip nut 63 is detachably fixedly installed on the top end of the pillar 61. The setting of the anti-slip nut 63 can prevent the pillar 61 from being separated from the sleeve 52; the pillar 61 is slidably installed in the corresponding sleeve 52, and the setting of the pillar 61 cooperating with the sleeve 52 allows the pillar 61 to slide smoothly along the sleeve 52, and both ends of the pillar 61 leak out from both ends of the sleeve 52; the anti-slip nut 63 is above the top end of the sleeve 52, and the diameter of the anti-slip nut 63 is larger than the inner diameter of the sleeve 52;

[0043] In one embodiment, Figure 1As shown, the lifting system includes a first scissors support rod 8, a second scissors support rod 9, a third scissors support rod 10, a fourth scissors support rod 11, a fifth scissors support rod 12, a sixth scissors support rod 13 and a lifting platform 14, and the first scissors support rod 8, the second scissors support rod 9, the third scissors support rod 10, the fourth scissors support rod 11, the fifth scissors support rod 12 and the sixth scissors support rod 13 are sequentially superimposed and rotatably connected, one side of the bottom of the first scissors support rod 8 is rotatably connected to the chassis 1, and the other side of the bottom of the first scissors support rod 8 is slidably connected to the chassis 1, one side of the top of the sixth scissors support rod 13 is rotatably connected to the bottom surface of the lifting platform 14, and the top of the sixth scissors support rod 13 The other side is slidably connected to the bottom surface of the lifting platform 14, so as to provide the required placement space for lifting the low-voltage bushing of the main transformer through the lifting platform 14; a first double oil cylinder 15 is fixedly installed between the first scissor support rod 8, the second scissor support rod 9 and the third scissor support rod 10 through a rotating seat and a connecting rod; a second double oil cylinder 16 is fixedly installed between the fourth scissor support rod 11, the fifth scissor support rod 12 and the sixth scissor support rod 13 through a rotating seat and a connecting rod; the hydraulic pump station of the first double oil cylinder 15 and the second double oil cylinder 16 is fixedly installed on the chassis 1; a locker 7 is fixedly installed at each end of the upper side of the lifting platform 14, and the locker 7 can ensure the stability of the lifting platform 14 when it is at the 7-meter position;

[0044] The lifting system mainly consists of a 3Kw hydraulic pump station system, four φ80 oil cylinders and 6 layers of scissor support rods. The pressure of the entire pump station system is less than 15MPa. The scissor support rods are made of high-strength rectangular tubes, which increase the rigidity and stability of the entire system. The scissor parts use high-strength Q345 rectangular tubes 120x60x5 and rectangular tube scissors, which increase the overall rigidity and ensure lifting stability.

[0045] In one embodiment, the lifting platform 14 is made of welded channel steel, and a patterned steel plate is added to the platform surface to prevent slipping.

[0046] In one embodiment, Figure 2 and Figure 10 As shown, the locker 7 includes a rotating cylinder 71 and a rotating arm 72, and the output end of the rotating cylinder 71 is fixedly connected to one end of the rotating arm 72, and a latch 73 is fixedly installed below the other end of the rotating arm 72; the rotating cylinder 71 is fixedly installed at one end above the lifting platform 14;

[0047] When the lifting platform 14 is flush with the plane where the main transformer low-voltage bushing is installed, the latch 73 can be driven up and down by rotating the oil cylinder 71, and the latch 73 is firmly connected to the plane where the main transformer low-voltage bushing is installed;

[0048] In one embodiment, after the device provided by this embodiment carries the main transformer low-voltage bushing to the desired position, before lifting, the steering wheel 28 and the directional wheel 34 can be manually raised and lowered;

[0049] When raising or lowering the steering wheel 28, the height of the steering wheel 28 can be adjusted by rotating the screw rod 23 forward and backward;

[0050] When raising or lowering the directional wheel 34, the adjusting rod 39 is rotated, and the directional wheel 34 can be raised under the cooperation of the gear timing belt 38 and the corresponding gear 37;

[0051] Thus, by adjusting the height of the steering wheel 28 and the directional wheel 34, the entire chassis is in contact with the ground, ensuring stability during lifting;

[0052] Before lifting, when adjusting the support mechanism, first, according to the situation of the substation aisle, loosen the nut 57, and then adjust the position of the support arm 5 and the support leg 6 along the linear slide 4. When the support arm 5 and the support leg 6 are moved to the desired position, tighten the nut 57 to lock the U-shaped seat 54 and the linear slide 4, preventing the support arm 5 from moving on the linear slide 4 during lifting;

[0053] Then adjust the angle between the support arm 5 and the chassis 1;

[0054] Finally, adjust the height of the support leg 6 according to the height of the chassis 1. When adjusting, just loosen the adjusting screw 53, slide the support leg 6 up and down along the sleeve 52 until the foot pad 62 touches the ground, and then lock the adjusting screw 53.

[0055] When the work is completed and towing and shifting are required, the wheels are manually remotely lowered and the supporting mechanism is reset.

[0056] It should be noted that the overall retracted dimensions are 1450mm in length, 900mm in width, and 1000mm in height, with a maximum lifting height of 7000mm and a self-standing height of 1000mm.

[0057] In one embodiment, the chassis 1 is made of high-strength channel steel welded together, with good overall rigidity. All parts of the equipment have anti-corrosion and anti-rust measures, and the surface of each component is strictly sandblasted and sprayed for rust prevention;

[0058] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0059] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A low-position hand-pushing device for a main transformer low-voltage bushing, characterized in that: The invention comprises a chassis (1) and a lifting system arranged on the chassis (1); support mechanisms contacting the ground are also installed on both sides of the chassis (1); a steering wheel mechanism (2) is installed at one end of the chassis (1), and a directional wheel mechanism (3) is installed at the other end; The support mechanism comprises a support arm (5) and a linear slide rail (4) fixed on the chassis (1); one end of the support arm (5) is slidably mounted in the linear slide rail (4), and the other end is connected to a support leg (6) in contact with the ground.

2. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 1, characterized in that: The steering wheel mechanism (2) comprises a U-shaped bracket (21) and an L bracket (25). A screw rod (23) is rotatably mounted in the U-shaped bracket (21) through a shaft sleeve (22). An anti-slip ring (24) is detachably mounted on the bottom end of the screw rod (23). A coaxial shaft hole (26) and a thread hole (27) are formed through one end surface of the L bracket (25). The inner diameter of the shaft hole (26) is larger than the inner diameter of the thread hole (27). Steering wheels (28) are rotatably mounted on both sides of the L bracket (25). One end of the screw rod (23) is engaged with an internal thread of the thread hole (27), and the other end of the screw rod (23) is rotatably extended from the U-shaped bracket (21). The anti-slip ring (24) rotates and slides in the shaft hole (26). A traction handle (17) is rotatably mounted on the other end of the L bracket (25).

3. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 1, characterized in that: The directional wheel mechanism (3) comprises a control box (31) and an adjusting rod (39). A U-shaped frame (32) is fixedly mounted on each end of the control box (31). A directional wheel group is slidably mounted in each of the U-shaped frames (32). Each of the directional wheel groups is rotationally connected to the control box (31). The two directional wheel groups are connected by a gear timing belt (38). The gear timing belt (38) is arranged in the control box (31). A cover plate (30) is detachably mounted on the control box (31). The adjusting rod (39) rotates through the cover plate (30) and is connected to one of the directional wheel groups.

4. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 3, characterized in that: The directional wheel group includes a U-shaped frame three (33) and a screw rod two (35). A directional wheel (34) is rotatably installed at the opening of the U-shaped frame three (33). One end of the screw rod two (35) is threadedly connected to the horizontal plate of the U-shaped frame three (33). Both ends of the screw rod two (35) leak out from both sides of the horizontal plate of the U-shaped frame three (33). An anti-drop cap (36) is installed at one end of the screw rod two (35) located below the horizontal plate of the U-shaped frame three (33), and a gear (37) is installed at one end of the screw rod two (35) located above the horizontal plate of the U-shaped frame three (33). The U-shaped frame three (33) is slidably installed in the corresponding U-shaped frame two (32), and the gear synchronous belt (38) is meshed with the corresponding gear (37).

5. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 1, characterized in that: A T-shaped slide groove (41) is provided on one side of the linear slide rail (4), and a rectangular slide groove (42) is further provided on the upper surface of the linear slide rail (4). The rectangular slide groove (42) and the T-shaped slide groove (41) are communicated with each other, and one end of the support arm (5) is slidably connected to the T-shaped slide groove (41) and the rectangular slide groove (42) respectively.

6. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 5, characterized in that: The support arm (5) comprises an arm (51) and a U-shaped seat (54), one end of the arm (51) is fixedly mounted with a sleeve (52), the circumference of the sleeve (52) is threadedly mounted with an adjusting screw (53), one end of the adjusting screw (53) is rotated and extended into the sleeve (52), the other end of the arm (51) is rotatably connected to the opening of the U-shaped seat (54), the outer side of the U-shaped seat (54) is fixedly mounted with a T-shaped slider (55), the T-shaped slider (55) ) is fixedly installed above the screw rod three (56), and a nut (57) is installed on the screw rod three (56) through threaded engagement. The T-shaped slider (55) is slidably installed in the T-shaped slide groove (41), and the screw rod three (56) is slidably installed in the rectangular slide groove (42). The top end of the screw rod three (56) leaks out of the rectangular slide groove (42), and the nut (57) is located above the outer side of the rectangular slide groove (42). The support leg (6) is slidably installed in the corresponding sleeve (52).

7. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 6, characterized in that: The support leg (6) includes a support column (61) and a foot pad (62) arranged at the bottom of the support column (61); a top end of the support column (61) is detachably mounted with an anti-slip nut (63); the support column (61) is mounted in a sleeve (52), and both ends of the support column (61) leak out from both ends of the sleeve (52); the diameter of the anti-slip nut (63) is larger than the inner diameter of the sleeve (52).

8. The low-position hand-pushing device for the main transformer low-voltage bushing according to claim 1 is characterized in that: The lifting system comprises a first scissors-type support rod (8), a second scissors-type support rod (9), a third scissors-type support rod (10), a fourth scissors-type support rod (11), a fifth scissors-type support rod (12) and a sixth scissors-type support rod (13) which are sequentially stacked and rotatably connected, one side of the bottom of the first scissors-type support rod (8) is rotatably connected to the chassis (1), and the other side of the bottom of the first scissors-type support rod (8) is slidably connected to the chassis (1), one side of the top of the sixth scissors-type support rod (13) is connected to a lifting platform (14), and the other side of the top of the sixth scissors-type support rod (13) is slidably connected to the bottom surface of the lifting platform (14).

9. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 8, characterized in that: A first double oil cylinder (15) is fixedly installed between the first scissor support rod (8), the second scissor support rod (9) and the third scissor support rod (10) via a rotating seat and a connecting rod, and a second double oil cylinder (16) is fixedly installed between the fourth scissor support rod (11), the fifth scissor support rod (12) and the sixth scissor support rod (13) via a rotating seat and a connecting rod. The hydraulic pump stations of the first double oil cylinder (15) and the second double oil cylinder (16) are both installed on the chassis (1), and a locker (7) is fixedly installed at both ends of one side above the lifting platform (14).

10. A low-position hand-pushing device for a main transformer low-voltage bushing according to claim 9, characterized in that: The locker (7) comprises a rotating oil cylinder (71) and a rotating arm (72), one end of the rotating arm (72) is connected to the output end of the rotating oil cylinder (71), a latch (73) is installed below the other end of the rotating arm (72), and the rotating oil cylinder (71) is fixedly installed at one end above the lifting platform (14).

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