Fixing method for welding of rear axle box body of engineering vehicle

Abstract

The invention relates to the technical field of fixing of rear axle boxes, in particular to a fixing method for welding of a rear axle box of an engineering vehicle, which comprises the following steps of: 1, hoisting the box to a position above a tool through a travelling crane, and assisting the box to fall by taking a guide rod as a backer; 2, a first hole of the box body is mainly positioned through a first hole pin assembly, and a second hole and a third hole of the box body are respectively subjected to auxiliary positioning through a second hole pin assembly and a third hole pin assembly; 3, after the box body is positioned, two sliding blocks of a first hole pin assembly slide outwards, so that a first pressing plate is pressed on a first hole; then, an anti-loosening base plate slides into the two limiting openings and is locked on the core seat through an anti-loosening bolt; and finally, the sliding block is locked on the core seat through a first hole pin bolt. The fixing of the first hole can be enhanced, and the anti-falling effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of rear axle housing fixing, and particularly to a fixing method for welding the rear axle housing of an engineering vehicle. Background Art

[0002] The large-horsepower rear axle housing is designed to bear large torque and power, and can adapt to the output of a high-horsepower engine to ensure the stability and reliability of the engineering vehicle under heavy load work. The rear axle housing transmits the power output by the engine to the drive wheels through the gearbox to realize the driving and operating functions of the tractor. Its internal structure includes parts such as central drive, steering mechanism, and final drive, ensuring that the power is distributed to the left and right drive wheels after deceleration, torque increase, and change of the power transmission direction. It plays a core role in the entire vehicle structure and power transmission.

[0003] The rear axle housing is an important structural component of the vehicle and needs to bear the weight and impact force during vehicle driving. Therefore, welding work needs to be carried out during the production process to ensure the strength and stability of the rear axle, and to ensure the strength and stability of the entire vehicle body.

[0004] In the welding process of the production of medium and large steel structural parts of construction machinery such as excavators and loaders, there are difficulties such as: multiple varieties and small batches; large workpiece external dimensions and large weight; complex workpiece external shapes, and welds are distributed in a three-dimensional space along with the shape of the workpiece. During the welding process, the workpiece needs to be repeatedly rotated and turned over; the weld fillet size of the workpiece is large, and multi-layer and multi-pass welding is required, resulting in high labor intensity, etc.

[0005] The rear axle housing is welded by multiple parts. First, the multiple parts are spot-welded together, and after the spot welding is completed, the welds are further welded.

[0006] Such as Figure 1 , the rear axle housing 2 has a first hole 201, a second hole 202, and a third hole 203. The first hole 201 is located at the center of the rear axle housing 2 and has a larger inner diameter compared to the second hole 202 and the third hole 203. Therefore, after the rear axle housing 2 is fixed on the workbench, most of the weight is concentrated on the fixed position of the first hole 201. During the welding process, it needs to be repeatedly rotated and turned over. Once the fixation of the first hole 201 fails or is not firm during the rotation and turning over process, there will be a risk of falling. Summary of the Invention

[0007] The purpose of the present invention is to provide a fixing method for welding the rear axle housing of an engineering vehicle, which can strengthen the fixation of the first hole.

[0008] The technical solution of the present invention:

[0009] A fixing method for welding the rear axle housing of an engineering vehicle, the method is as follows:

[0010] Step 1: The box body is hoisted above the tooling by a crane, and the alignment rod is used as a backing to assist the box body in positioning.

[0011] Step 2: Then, the first hole pin assembly mainly positions the first hole of the box body, and the second hole pin assembly and the third hole pin assembly respectively assist in positioning the second hole and the third hole of the box body.

[0012] Step 3: After the box body is positioned, slide the two sliders of the first hole pin assembly outwards so that the first pressing plate presses on the first hole; then slide the anti-loosening cushion plate into the two limit ports and lock it on the core seat through the anti-loosening bolt; finally, lock the slider on the core seat through the first hole pin bolt.

[0013] Step 4: After the first hole pin assembly fixes the box body, place the second pressing plate of the second hole pin assembly on the second hole, and lock the second pressing plate on the second pin seat through the second hole pin bolt so that the second pressing plate presses tightly on the second hole of the box body; place the third pressing plate of the third hole pin assembly on the third hole, and lock the third pressing plate on the third pin seat through the third hole pin bolt so that the third pressing plate presses tightly on the third hole of the box body.

[0014] Step 5: Then, place the tail pressing plate of the tail pressing-down assembly on the tail of the box body, lock the tail pressing plate on the tail fixing seat through the first tail bolt, and lock the tail pressing plate on the tail fixing plate through the second tail bolt so that the tail pressing plate presses tightly on the tail of the box body.

[0015] Step 6: Place the upper hypotenuse pressing plate of the upper hypotenuse pressing-down assembly on the upper hypotenuse of the box body, place the end with the heightening block on the upper hypotenuse fixing plate, and lock the upper hypotenuse pressing plate on the upper hypotenuse fixing seat through the upper hypotenuse bolt so that the upper hypotenuse pressing plate presses tightly on the upper hypotenuse of the box body.

[0016] Step 7: Place the back pressing plate of the back pressing plate assembly on the back of the box body, place the end with the heightening block on the back fixing plate, and lock the back pressing plate on the back fixing seat through the back bolt so that the back pressing plate presses tightly on the back of the box body.

[0017] Step 8: Drive the tightening block to move by rotating the screw of the side clamping assembly so that the tightening block presses tightly on the side of the box body.

[0018] Further, the tooling includes a base, and a first pin assembly is arranged on the base; the first pin assembly includes a core seat fixed on the base, two symmetrically arranged chutes are formed in the core seat, sliders are arranged in the chutes, and the sliders are fixed on the core seat by first pin bolts so as to facilitate the sliders to press against the first holes of the box body; a loosening prevention backing plate for resisting the two sliders is arranged between the two sliders to prevent the two sliders from sliding towards each other; the loosening prevention backing plate is fixed on the core seat by a loosening prevention bolt.

[0019] Further, the shape of the chute is an inverted T shape; the slider includes an inverted T-shaped slider matched with the chute and a first pressing plate; a limiting port is arranged on the inner side of the first pressing plate so as to facilitate the loosening prevention backing plate to resist the slider.

[0020] Further, a tail pressing-down assembly is further arranged on the base; the tail pressing-down assembly includes a plurality of tail fixing plates fixed on the base, a tail fixing seat is fixed between two adjacent tail fixing plates, a tail pressing plate is arranged above the tail fixing plates; the tail pressing plate is fixed on the tail fixing seat by a first tail bolt and is arranged on the tail fixing plates by a second tail bolt so as to facilitate the tail pressing plate to press against the tail of the box body.

[0021] Further, an upper bevel pressing-down assembly is further arranged on the base; the upper bevel pressing-down assembly includes two upper bevel fixing plates fixed on the base, an upper bevel fixing seat is fixed between the two upper bevel fixing plates, an upper bevel pressing plate is arranged above the upper bevel fixing plates, and the upper bevel pressing plate is fixed on the upper bevel fixing seat by an upper bevel bolt so as to facilitate the upper bevel pressing plate to press against the upper bevel of the box body; the end of the upper bevel pressing plate contacts with the upper bevel fixing plate through an upper bevel heightening block.

[0022] Further, a second pin assembly is further arranged on the base; the second pin assembly includes a second pin seat fixed on the base, a second pressing plate is arranged above the second pin seat, and the second pressing plate is fixed on the second pin seat by a second pin bolt so as to facilitate the second pressing plate to press against the second hole of the box body.

[0023] Further, a third pin assembly is further arranged on the base; the third pin assembly includes two third pin seats fixed on the base, a third pressing plate is arranged above the third pin seats, and the third pressing plate is fixed on the third pin seats by third pin bolts so as to facilitate the third pressing plate to press against the third holes of the box body.

[0024] Further, a back pressing component is also arranged on the base; the back pressing component includes two back fixing plates fixed on the base, a back fixing seat is fixed between the two back fixing plates, a back pressing plate is arranged above the back fixing plates, and the back pressing plate is fixed on the back fixing seat through back bolts, so as to facilitate the back pressing plate to press tightly on the back surface of the box body; the end of the back pressing plate contacts the back fixing plate through a back heightening block.

[0025] Further, a side clamping component is also arranged on the base; the side clamping component includes two support seats fixed on the base, a screw rod is threadedly connected to the support seat, and the end of the screw rod is connected with a tightening block through a bearing, so as to facilitate the tightening block to press tightly on the side surface of the box body.

[0026] Further, a guiding rod for assisting the box body to be positioned is also fixed on the base.

[0027] Advantages of the present invention:

[0028] When the rear axle box body is turned downward, most of the overall weight is concentrated on the first pressing plate and the first pin bolt, and there is a risk of falling. When the first pin bolt breaks, the anti-loosening backing plate abuts against the limiting opening of the first pressing plate, preventing the two sliders from sliding towards each other and losing the pressing on the clamping groove of the first hole, thereby preventing the box body from falling, and playing a role in preventing falling.

[0029] The present invention can strengthen the fixation of the first hole and play a role in preventing falling. Description of the drawings

[0030] Figure 1 is a schematic structural diagram of the box body.

[0031] Figure 2 is a schematic structural diagram of the present invention.

[0032] Figure 3 is a schematic structural diagram of the tooling.

[0033] Figure 4 is a schematic structural diagram of the first pin assembly.

[0034] Figure 5 is a schematic structural diagram of the limiting opening.

[0035] Figure 6 is a schematic structural diagram of the tail pressing component and the side clamping component.

[0036] Figure 7 is a schematic structural diagram of the upper hypotenuse pressing component.

[0037] Figure 8 is a schematic structural diagram of the second pin assembly and the third pin assembly.

[0038] Figure 9 It is a schematic structural diagram of the back pressing component. Detailed implementation manner

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] As Figures 1-9 shown, the present invention provides a fixing method for welding the rear axle housing of an engineering vehicle, and the method is as follows:

[0041] Step 1: The housing is lifted above the tooling by a crane, and the guide rod is used as a backing to assist the housing in positioning.

[0042] Step 2: Then, the first pin component mainly positions the first hole of the housing, and the second pin component and the third pin component respectively assist in positioning the second hole and the third hole of the housing.

[0043] Step 3: After the housing is positioned, slide the two sliders of the first pin component outwards so that the first pressing plate presses on the first hole; then slide the anti-loosening backing plate into the two limiting ports and lock it on the core seat through the anti-loosening bolt; finally, lock the slider on the core seat through the first pin bolt.

[0044] Step 4: After the first pin component fixes the housing, place the second pressing plate of the second pin component on the second hole, and lock the second pressing plate on the second pin seat through the second pin bolt so that the second pressing plate presses tightly on the second hole of the housing; place the third pressing plate of the third pin component on the third hole, and lock the third pressing plate on the third pin seat through the third pin bolt so that the third pressing plate presses tightly on the third hole of the housing.

[0045] Step 5: Then, place the tail pressing plate of the tail pressing component on the tail of the housing, lock the tail pressing plate on the tail fixing seat through the first tail bolt, and lock the tail pressing plate on the tail fixing plate through the second tail bolt so that the tail pressing plate presses tightly on the tail of the housing.

[0046] Step 6: Place the upper hypotenuse pressing plate of the upper hypotenuse pressing component on the upper hypotenuse of the housing, place the end with the heightening block on the upper hypotenuse fixing plate, and lock the upper hypotenuse pressing plate on the upper hypotenuse fixing seat through the upper hypotenuse bolt so that the upper hypotenuse pressing plate presses tightly on the upper hypotenuse of the housing.

[0047] Step 7: Place the back pressing plate of the back pressing component on the back of the housing, place the end with the heightening block on the back fixing plate, and lock the back pressing plate on the back fixing seat through the back bolt so that the back pressing plate presses tightly on the back of the housing.

[0048] Step 8: Rotate the screw of the side clamping component to drive the top block to move so that the top block presses tightly on the side of the housing.

[0049] The tooling includes a base 1 , on which a first hole pin assembly 3 is disposed; the first hole pin assembly 3 is used to compress the first hole 201 of the box body 2 .

[0050] The first hole pin assembly 3 includes a core seat 31 fixed on the base 1, and two symmetrical slide grooves 32 are provided on the core seat 31. A slider 33 is arranged in the slide groove 32, and the slider 33 is fixed to the core seat 31 via a first hole pin bolt 34, so that the slider 33 is pressed against the first hole 201 of the box body 2; an anti-loosening pad 35 is arranged between the two sliders 33 to resist the two sliders 33 and prevent the two sliders 33 from sliding toward each other; the anti-loosening pad 35 is fixed to the core seat 31 via an anti-loosening bolt 36.

[0051] The shape of the slide groove 32 is an inverted T shape; the slider 33 includes an inverted T-shaped slider 33 matched with the slide groove 32, and a first pressure plate 38; the inner side of the first pressure plate 38 has a limiting opening 37 to facilitate the anti-loosening pad 35 to resist the slider 33.

[0052] Slide the two sliders 33 inwards, and then align the first hole 201 of the box body 2 with the core seat 31. After the placement is completed, slide the two sliders 33 outwards so that the first pressure plate 38 presses on the first hole 201; then slide the anti-loosening pad 35 into the two limiting openings 37 and lock it on the core seat 31 through the anti-loosening bolts 36; finally, lock the slider 33 on the core seat 31 through the first hole pin bolt 34. When the first hole pin bolt 34 breaks, the anti-loosening pad 35 is pressed against the limiting opening 37 of the first pressure plate 38 to prevent the two sliders 33 from sliding towards each other and losing the clamping groove of the first hole 201, so that the box body 2 falls off, thereby playing a role in preventing it from falling off.

[0053] A plurality of hanging bolts 39 are fixed on the circumference of the core seat 31 . The core seat 31 is fixed to the base 1 by screws. When the first hole pin assembly 3 is disassembled and replaced, the hanging bolts 39 can facilitate the hanging of the first hole pin assembly 3 .

[0054] A tail pressing assembly 4 is also provided on the base 1, and the tail pressing assembly 4 is used to press the tail of the box body 2; the tail pressing assembly 4 includes a plurality of tail fixing plates 41 fixed on the base 1, and a tail fixing seat 42 is fixed between two adjacent tail fixing plates 41, and a tail pressing plate 43 is provided above the tail fixing plate 41; the tail pressing plate 43 is fixed to the tail fixing seat 42 via a first tail bolt 44, and is provided on the tail fixing plate 41 via a second tail bolt 45, so as to facilitate the tail pressing plate 43 to be pressed on the tail of the box body 2.

[0055] Place the tail pressing plate 43 at the tail of the box body 2. Lock the tail pressing plate 43 to the tail fixing seat 42 through the first tail bolt 44, and lock the tail pressing plate 43 to the tail fixing plate 41 through the second tail bolt 45, so that the tail pressing plate 43 presses tightly on the tail of the box body 2, and the tail of the box body 2 can be fixed.

[0056] An upper hypotenuse pressing component 5 is further arranged on the base 1. The upper hypotenuse pressing component 5 is used to press the upper hypotenuse of the box body 2. The upper hypotenuse pressing component 5 includes two upper hypotenuse fixing plates 51 fixed on the base 1. An upper hypotenuse fixing seat 52 is fixed between the two upper hypotenuse fixing plates 51. An upper hypotenuse pressing plate 53 is arranged above the upper hypotenuse fixing plate 51. The upper hypotenuse pressing plate 53 is fixed to the upper hypotenuse fixing seat 52 through an upper hypotenuse bolt 54, so that the upper hypotenuse pressing plate 53 presses tightly on the upper hypotenuse of the box body 2. The end of the upper hypotenuse pressing plate 53 contacts the upper hypotenuse fixing plate 51 through an upper hypotenuse heightening block 55.

[0057] Place the upper hypotenuse pressing plate 53 on the upper hypotenuse of the box body 2, and place the end with the upper hypotenuse heightening block 55 on the upper hypotenuse fixing plate 51. Lock the upper hypotenuse pressing plate 53 to the upper hypotenuse fixing seat 52 through the upper hypotenuse bolt 54, so that the upper hypotenuse pressing plate 53 presses tightly on the upper hypotenuse of the box body 2, and the upper hypotenuse of the box body 2 can be fixed.

[0058] A second pin component 6 is further arranged on the base 1. The second pin component 6 is used to press the second hole 202 of the box body 2. The second pin component 6 includes a second pin seat 61 fixed on the base 1. A second pressing plate 62 is arranged above the second pin seat 61. The second pressing plate 62 is fixed to the second pin seat 61 through a second pin bolt 63, so that the second pressing plate 62 presses tightly on the second hole 202 of the box body 2.

[0059] Align the second hole 202 of the box body 2 with the second pin seat 61 and place it, then place the second pressing plate 62 on the second hole 202. Lock the second pressing plate 62 to the second pin seat 61 through the second pin bolt 63, so that the second pressing plate 62 presses tightly on the second hole 202 of the box body 2, and the second hole 202 of the box body 2 can be fixed.

[0060] A third pin component 7 is further arranged on the base 1. The third pin component 7 is used to press the third hole 203 of the box body 2. The third pin component 7 includes two third pin seats 71 fixed on the base 1. A third pressing plate 72 is arranged above the third pin seat 71. The third pressing plate 72 is fixed to the third pin seat 71 through a third pin bolt 73, so that the third pressing plate 72 presses tightly on the third hole 203 of the box body 2.

[0061] Align the third hole 203 of the box body 2 with the third pin seat 71, then place the third pressing plate 72 on the third hole 203, and lock the third pressing plate 72 to the third pin seat 71 through the third hole pin bolt 73, so that the third pressing plate 72 presses on the third hole 203 of the box body 2, and the third hole 203 of the box body 2 can be fixed.

[0062] A back pressing component 8 is further arranged on the base 1, and the back pressing component 8 is used for pressing the back surface of the box body 2; the back pressing component 8 includes two back fixing plates 81 fixed on the base 1, a back fixing seat 82 is fixed between the two back fixing plates 81, a back pressing plate 83 is arranged above the back fixing plate 81, and the back pressing plate 83 is fixed on the back fixing seat 82 through a back bolt 84, so that the back pressing plate 83 can press on the back surface of the box body 2; the end of the back pressing plate 83 contacts the back fixing plate 81 through a back heightening block 85.

[0063] Place the back pressing plate 83 on the back surface of the box body 2, with the end having the back heightening block 85 placed on the back fixing plate 81, and lock the back pressing plate 83 to the back fixing seat 82 through the back bolt 84, so that the back pressing plate 83 presses on the back surface of the box body 2, and the back surface of the box body 2 can be fixed.

[0064] A side clamping component 9 is further arranged on the base 1, and the side clamping component 9 is used for clamping the side surface of the box body 2; the side clamping component 9 includes two support seats 91 fixed on the base 1, a screw rod 92 is threadedly connected to the support seat 91, and the end of the screw rod 92 is connected with a pressing block 93 through a bearing, so that the pressing block 93 can press on the side surface of the box body 2. Rotate the screw rod 92 to drive the pressing block 93 to move, so that the pressing block 93 presses on the side surface of the box body 2.

[0065] A guiding rod 10 for assisting the box body 2 to be positioned is further fixed on the base 1, and the guiding rod 10 is used as a backstop to assist the box body 2 to be positioned.

[0066] The above are only the preferred embodiments of the present invention, and should not be construed as a limitation to this application. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. A fixing method for welding a rear axle box of an engineering vehicle, characterized in that: Here’s how: Step 1: The box is hoisted to the top of the tooling by a crane, and the guide rod is used as a backing to assist the box to fall into place; Step 2: The first hole pin assembly is used to mainly position the first hole of the box body, and the second hole pin assembly and the third hole pin assembly are used to assist in positioning the second hole and the third hole of the box body respectively; Step 3: After the box is positioned, slide the two sliders of the first hole pin assembly outward so that the first pressure plate is pressed on the first hole; then slide the anti-loosening pad into the two limit openings and lock it on the core seat with the anti-loosening bolts; finally, lock the slider on the core seat with the first hole pin bolts; Step 4: After the first hole pin assembly is fixed to the box body, the second pressing plate of the second hole pin assembly is placed on the second hole, and the second pressing plate is locked on the second pin seat by the second hole pin bolt, so that the second pressing plate is pressed on the second hole of the box body; the third pressing plate of the third hole pin assembly is placed on the third hole, and the third pressing plate is locked on the third pin seat by the third hole pin bolt, so that the third pressing plate is pressed on the third hole of the box body; Step 5: Then, the tail pressing plate of the tail pressing assembly is placed on the tail of the box body, the tail pressing plate is locked on the tail fixing seat by the first tail bolt, and the tail pressing plate is locked on the tail fixing plate by the second tail bolt, so that the tail pressing plate is pressed on the tail of the box body; Step 6: Place the upper bevel pressing plate of the upper bevel pressing assembly on the upper bevel of the box, place one end with the pad block on the upper bevel fixing plate, and lock the upper bevel pressing plate on the upper bevel fixing seat by the upper bevel bolts, so that the upper bevel pressing plate is pressed against the upper bevel of the box; Step 7: Place the back pressure plate of the back pressure plate assembly on the back of the box, place one end with the spacer block on the back fixing plate, and lock the back pressure plate on the back fixing seat with the back bolts, so that the back pressure plate is pressed against the back of the box; Step 8: The tightening block is driven to move by rotating the screw of the side clamping assembly so that the tightening block is tightened against the side of the box.

2. A fixing method for welding a rear axle box of an engineering vehicle according to claim 1, characterized in that: The tooling includes a base, on which a first hole pin assembly is arranged; the first hole pin assembly includes a core seat fixed on the base, on which two symmetrical slide grooves are provided, in which a slider is arranged, and the slider is fixed to the core seat via a first hole pin bolt to facilitate the slider to be pressed against the first hole of the box body; between the two sliders, an anti-loosening pad is arranged to resist the two sliders to prevent the two sliders from sliding toward each other; the anti-loosening pad is fixed to the core seat via an anti-loosening bolt.

3. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: The shape of the slide groove is an inverted T shape; the slider includes an inverted T-shaped slider matched with the slide groove, and a first pressing plate; the inner side of the first pressing plate has a limiting opening to facilitate the anti-loosening pad to press against the slider.

4. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: A tail pressing assembly is also provided on the base; the tail pressing assembly includes a plurality of tail fixing plates fixed on the base, a tail fixing seat is fixed between two adjacent tail fixing plates, and a tail pressing plate is provided above the tail fixing plate; the tail pressing plate is fixed to the tail fixing seat via a first tail bolt, and is provided on the tail fixing plate via a second tail bolt, so as to facilitate the tail pressing plate to be pressed tightly on the tail of the box.

5. The fixing method for welding the rear axle box of an engineering vehicle according to claim 2, characterized in that: An upper bevel pressing down assembly is also provided on the base; the upper bevel pressing down assembly includes two upper bevel fixing plates fixed on the base, an upper bevel fixing seat is fixed between the two upper bevel fixing plates, an upper bevel pressing plate is provided above the upper bevel fixing plates, the upper bevel pressing plate is fixed to the upper bevel fixing seat via upper bevel bolts, so as to facilitate the upper bevel pressing plate to be pressed against the upper bevel of the box body; the end of the upper bevel pressing plate contacts the upper bevel fixing plate via an upper bevel raising block.

6. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: A second hole pin assembly is also provided on the base; the second hole pin assembly includes a second pin seat fixed on the base, a second pressure plate is provided above the second pin seat, and the second pressure plate is fixed to the second pin seat via a second hole pin bolt to facilitate the second pressure plate to be pressed against the second hole of the box body.

7. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: A third hole pin assembly is also provided on the base; the third hole pin assembly includes two third pin seats fixed on the base, a third pressure plate is provided above the third pin seat, and the third pressure plate is fixed to the third pin seat via a third hole pin bolt to facilitate the third pressure plate to be pressed against the third hole of the box body.

8. The fixing method for welding the rear axle box of an engineering vehicle according to claim 2, characterized in that: The base is also provided with a back pressing assembly; the back pressing assembly includes two back fixing plates fixed on the base, a back fixing seat is fixed between the two back fixing plates, a back pressure plate is provided above the back fixing plates, and the back pressure plate is fixed to the back fixing seat via back bolts to facilitate the back pressure plate to be pressed tightly on the back of the box; the end of the back pressure plate contacts the back fixing plate via a back raising block.

9. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: The base is also provided with a side clamping assembly; the side clamping assembly comprises two support seats fixed on the base, the support seats are threadedly connected with screws, and the ends of the screws are connected with tightening blocks via bearings to facilitate the tightening of the tightening blocks against the sides of the box.

10. A fixing method for welding a rear axle box of an engineering vehicle according to claim 2, characterized in that: A guide rod for assisting the box body to land is also fixed on the base.

Images