Loader S-arm support welding tool and S-arm support welding machining method

Abstract

The invention discloses a loader S-arm support welding tool and an S-arm support welding method, and belongs to the technical field of loader equipment.The loader S-arm support welding tool comprises a supporting lug guiding rest stand and a groove-shaped cross beam guiding rest stand used for containing a groove-shaped cross beam, and the supporting lug guiding rest stand is arranged at one end of the groove-shaped cross beam guiding rest stand; the two ends of the supporting lug guiding rest stand are provided with fixing bases used for placing supporting lugs, the gap between the two fixing bases is at least equal to the length of the groove-shaped cross beam, and a positioning block used for positioning the supporting lugs and the groove-shaped cross beam is arranged between the two fixing bases. Supporting lug guiding, pushing and pressing mechanisms used for pushing supporting lugs are arranged at the ends, away from the positioning blocks, of the two fixing bases correspondingly, and a groove-shaped cross beam pushing and pressing mechanism used for pushing and pressing a groove-shaped cross beam is arranged at the end, away from the supporting lug guiding and placing frame, of the groove-shaped cross beam guiding and placing frame. The S-shaped arm support machined through the welding tool guarantees the machining precision and the technical requirements, the welding efficiency is high, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of loader equipment, and in particular to a loader S-arm support welding tool and an S-arm support welding processing method. Background Art

[0002] As a kind of construction machinery, loaders play an indispensable role in modern construction. Loaders are widely used and play a key role in the construction of highways, railways, buildings, hydropower and other projects. Loaders are mainly composed of working devices, power systems, hydraulic systems, travel systems, braking systems and electrical systems. Among them, the working device is the core component of the loader to complete material loading and unloading tasks. The working device is mainly composed of a bucket and an H-arm. The H-arm is composed of two H-arm side plates and an S-arm support. The S-arm support is a welded part. During the welding process, the coaxiality of the hole on the lug and the connection between the lug and the groove beam have strict technical requirements on shape, size and relative position. In order to ensure the technical requirements and welding efficiency of the S-arm support, we proposed a loader S-arm support welding tooling and S-arm support welding processing method. Summary of the invention

[0003] The object of the present invention is to provide a loader S-arm support welding tool and an S-arm support welding method to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a loader S-arm supporting welding tooling, comprising a lug guide shelf and a grooved beam guide shelf for placing a grooved beam, the lug guide shelf is arranged at one end of the grooved beam guide shelf, both ends of the lug guide shelf are provided with fixed seats for placing the lugs, the distance between the inner end surfaces of the two fixed seats is at least equal to the length of the grooved beam, a positioning block for positioning the lug and the grooved beam is provided between the two fixed seats, the ends of the two fixed seats away from the positioning blocks are provided with a lug guide pushing and clamping mechanism for pushing the lug, and the end of the grooved beam guide shelf away from the lug guide shelf is provided with a grooved beam pushing and clamping mechanism for pushing and clamping the grooved beam.

[0006] Furthermore, the lug guide pushing and clamping mechanism includes an oil tank, a three-position four-way reversing valve 1, a three-position four-way reversing valve 2, a working oil cylinder 1 and a working oil cylinder 2, the oil outlet end of the oil tank is connected with an oil pump 1, the oil outlet end of the oil pump 1 is connected with the P port of the three-position four-way reversing valve 1, the A port of the three-position four-way reversing valve 1 is connected with the first oil port of the working oil cylinder 1, the B port of the three-position four-way reversing valve 1 is connected with the second oil port of the working oil cylinder 1, the T port of the three-position four-way reversing valve 1 is connected with the T port of the three-position four-way reversing valve 2, the A port of the three-position four-way reversing valve 2 is connected with the first oil port of the working oil cylinder 2, the B port of the three-position four-way reversing valve 2 is connected with the second oil port of the working oil cylinder 2, and the P port of the three-position four-way reversing valve 2 is connected with the oil return port of the oil tank.

[0007] Furthermore, an oil filter 1 is provided between the oil tank and the oil pump 1, the oil pump 1 is connected to the P port of the three-position four-way reversing valve 1 through a first oil pipe, and a first safety valve is provided on the first oil pipe.

[0008] Furthermore, a one-way throttle valve 1 is provided between the A port of the three-position four-way reversing valve 1 and the first oil port of the working cylinder 1, a one-way throttle valve 2 is provided between the B port of the three-position four-way reversing valve 1 and the second oil port of the working cylinder 1, a one-way throttle valve 3 is provided between the A port of the three-position four-way reversing valve 2 and the first oil port of the working cylinder 2, and a one-way throttle valve 4 is provided between the B port of the three-position four-way reversing valve 2 and the second oil port of the working cylinder 2.

[0009] Furthermore, the groove-type crossbeam pushing and clamping mechanism includes oil pump two, three-position four-way reversing valve three, three-position four-way reversing valve four, working cylinder three and working cylinder four. The oil inlet end of the oil pump two is connected to the oil outlet end of the oil tank, the oil outlet end of the oil pump two is connected to the P port of the three-position four-way reversing valve three, the A port of the three-position four-way reversing valve three is connected to the first oil port of the working cylinder three, the B port of the three-position four-way reversing valve three is connected to the second oil port of the working cylinder three, the T port of the three-position four-way reversing valve three is connected to the T port of the three-position four-way reversing valve four, the A port of the three-position four-way reversing valve four is connected to the first oil port of the working cylinder four, the B port of the three-position four-way reversing valve four is connected to the second oil port of the working cylinder four, and the P port of the three-position four-way reversing valve four is connected to the oil return port of the oil tank.

[0010] Furthermore, an oil filter 2 is provided between the oil tank and the oil pump 2, the oil pump 2 is connected to the P port of the three-position four-way reversing valve 3 through a second oil pipe, and a second safety valve is provided on the second oil pipe.

[0011] Furthermore, a one-way throttle valve five is provided between the A port of the three-position four-way reversing valve three and the first oil port of the working cylinder three, a one-way throttle valve six is ​​provided between the B port of the three-position four-way reversing valve three and the second oil port of the working cylinder three, a one-way throttle valve seven is provided between the A port of the three-position four-way reversing valve four and the first oil port of the working cylinder four, and a one-way throttle valve eight is provided between the B port of the three-position four-way reversing valve four and the second oil port of the working cylinder four.

[0012] Furthermore, the first oil pipe and the second oil pipe are both provided with pressure gauges for detecting the oil pipe pressure.

[0013] In a second aspect, the present invention provides a loader S-arm support welding processing method for processing a loader S-arm support, comprising the following steps:

[0014] S1: placing a plurality of ears on the fixing seats at both ends of the ear guide shelf, and placing a plurality of grooved beams on the grooved beam guide shelf;

[0015] S2: After the lugs and the grooved beams are placed respectively, the grooved beam pushing and pressing mechanism is started, and the working cylinder of the grooved beam pushing and pressing mechanism pushes the grooved beam until the grooved beam near one end of the lug guide shelf is pushed and pressed onto the grooved beam positioning surface of the positioning block;

[0016] S3: Start the lug guide pushing and pressing mechanism, and the working cylinder of the lug guide pushing and pressing mechanism pushes the lugs at both ends until the lugs close to the positioning block are pushed and pressed against the lug positioning surfaces on both sides of the positioning block, thereby completing the assembly of the lugs and the grooved crossbeam;

[0017] S4: Weld and assemble the connection between the lug and the trough beam, hang down the welded S-arm support for cooling, and start welding the next S-arm support at the same time.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] In the present invention, the supporting ears are respectively placed on the fixed seats of the supporting ear guide shelf, the grooved beam is placed on the grooved beam guide shelf, the working cylinder of the grooved beam pushing and clamping mechanism pushes the grooved beam to the grooved beam positioning surface of the positioning block, and the working cylinder of the supporting ear guide pushing and clamping mechanism pushes the supporting ears to the supporting ear positioning surfaces on both sides of the positioning block, thereby completing the assembly of the supporting ears and the grooved beam. The assembly accuracy is high, which ensures the welding accuracy of the subsequent S-arm support. The S-arm support processed by the welding tooling ensures the processing accuracy and technical requirements, has high welding efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a loader S-arm support welding tooling according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 3 It is a structural schematic diagram of the lug guide pushing and clamping mechanism according to an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of a groove-shaped beam pushing and guiding mechanism according to an embodiment of the present invention;

[0024] Figure 5 The figure is a flow chart of a loader S-arm support welding method according to an embodiment of the present invention.

[0025] In the figure: 1, support ear guide shelf, 2, fixed seat, 3, support ear, 4, groove beam guide shelf, 5, groove beam, 6, positioning block, 7, support ear guide push clamping mechanism, 71, oil tank, 72, oil filter 1, 73, oil pump 1, 74, first oil pipe, 75, first safety valve, 76, three-position four-way reversing valve 1, 77, three-position four-way reversing valve 2, 78, working cylinder 1, 79, working cylinder 2, 791, one-way throttle valve 1, 792, one-way throttle valve Valve two, 793, one-way throttle valve three, 794, one-way throttle valve four, 8, grooved crossbeam pushing and clamping mechanism, 81, oil filter two, 82, oil pump two, 83, second oil pipe, 84, second safety valve, 85, three-position four-way reversing valve three, 86, three-position four-way reversing valve four, 87, working cylinder three, 88, working cylinder four, 89, one-way throttle valve five, 891, one-way throttle valve six, 892, one-way throttle valve seven, 893, one-way throttle valve eight, 9, pressure gauge. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0027] In this article, terms such as "left, right, up, down, front, and back" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection.

[0028] See also Figures 1 to 4The present embodiment provides a loader S-arm support welding tool, including a lug guide shelf 1 and a groove beam guide shelf 4, wherein the groove beam guide shelf 4 is used to place the groove beam 5. In the present embodiment, the groove beam guide shelf 4 can place twenty groove beams 5. The lug guide shelf 1 is arranged at one end of the groove beam guide shelf 4, and fixed seats 2 are arranged at both ends of the lug guide shelf 1, wherein the fixed seats 2 are used to place the lugs 3. The distance between the inner end faces of the two fixed seats 2 is at least equal to the length of the groove beam 5, so that the groove beam pushing and clamping mechanism 8 can push the groove beam 5 to the groove beam positioning surface of the positioning block 6 located between the two fixed seats 2. A positioning block 6 is provided between the two fixed seats 2. The positioning block 6 is fixedly mounted on the ear guide shelf 1. The positioning block 6 includes an ear positioning surface and a groove-shaped beam positioning surface. The ear positioning surface is the surface of the positioning block 6 relative to the ear 3, and the groove-shaped beam positioning surface is the surface of the positioning block 6 relative to the groove-shaped beam 5. The ear positioning surface is used to position the ear 3, and the groove-shaped beam positioning surface is used to position the groove-shaped beam 5.

[0029] Specifically, the two fixing seats 2 are provided with a lug guide pushing and pressing mechanism 7 at one end away from the positioning block 6, and the lug guide pushing and pressing mechanism 7 is used to push the lug 3 to the lug positioning surface of the positioning block 6. The groove beam guide shelf 4 is provided with a groove beam pushing and pressing mechanism 8 at one end away from the lug guide shelf 1, and the groove beam pushing and pressing mechanism 8 is used to push the groove beam 5 to the groove beam positioning surface of the positioning block 6.

[0030] Specifically, in the present invention, the lugs 3 are respectively placed on the fixed seats 2 of the lug guide shelf 1, the grooved beam 5 is placed on the grooved beam guide shelf 4, the working cylinder of the grooved beam pushing and clamping mechanism 8 pushes the grooved beam 5 to the grooved beam positioning surface of the positioning block 6, and the working cylinder of the lug guide pushing and clamping mechanism 7 pushes the lug 3 to the lug positioning surfaces on both sides of the positioning block 6, completing the assembly of the lug 3 and the grooved beam 5, with high assembly accuracy, ensuring the subsequent welding accuracy of the S-arm support, and the S-arm support processed by the present welding tooling ensures the processing accuracy and technical requirements, has high welding efficiency, and reduces production costs.

[0031] Specifically, Figure 3As shown, the lug guide push-pushing mechanism 7 includes an oil tank 71, a three-position four-way reversing valve 1 76, a three-position four-way reversing valve 2 77, a working oil cylinder 1 78 and a working oil cylinder 2 79. The oil outlet of the oil tank 71 is connected to the oil pump 1 73, the oil outlet of the oil pump 1 73 is connected to the P port of the three-position four-way reversing valve 1 76, the A port of the three-position four-way reversing valve 1 76 is connected to the first oil port of the working oil cylinder 1 78, the B port of the three-position four-way reversing valve 1 76 is connected to the second oil port of the working oil cylinder 1 78, the T port of the three-position four-way reversing valve 1 76 is connected to the T port of the three-position four-way reversing valve 2 77, the A port of the three-position four-way reversing valve 2 77 is connected to the first oil port of the working oil cylinder 2 79, the B port of the three-position four-way reversing valve 2 77 is connected to the second oil port of the working oil cylinder 2 79, and the P port of the three-position four-way reversing valve 2 77 is connected to the oil return port of the oil tank 71. An oil filter 72 is also provided between the oil tank 71 and the oil pump 73. The oil filter 72 can filter out impurities in the hydraulic oil to ensure the normal operation of the lug guide push and clamp mechanism 7. The oil pump 73 is connected to the P port of the three-position four-way reversing valve 76 through the first oil pipe 74. The first oil pipe 74 is provided with a first safety valve 75. By providing the first safety valve 75, the pressure in the first oil pipe 74 can be relieved when it exceeds the set value, so as to avoid excessive pressure in the first oil pipe 74 and protect the hydraulic system of the lug guide push and clamp mechanism 7. A pressure gauge 9 is also installed on the first oil pipe 74. The pressure gauge 9 can display the pressure in the first oil pipe 74 in real time so that the staff can check it in time.

[0032] Specifically, a one-way throttle valve 1 791 is provided between the A port of the three-position four-way reversing valve 1 76 and the first oil port of the working cylinder 1 78, a one-way throttle valve 2 792 is provided between the B port of the three-position four-way reversing valve 1 76 and the second oil port of the working cylinder 1 78, a one-way throttle valve 3 793 is provided between the A port of the three-position four-way reversing valve 2 77 and the first oil port of the working cylinder 2 79, and a one-way throttle valve 4 794 is provided between the B port of the three-position four-way reversing valve 2 77 and the second oil port of the working cylinder 2 79. The one-way regulating valves adjust the flow of hydraulic oil in a specific direction according to actual needs, and cut off the flow in the reverse direction, thereby protecting the hydraulic system from the influence of backflow and ensuring the stability and reliability of the system.

[0033] Specifically, the T port of the three-position four-way reversing valve 1 76 is connected to the T port of the three-position four-way reversing valve 2 77 , so that the movement of the working cylinder 1 78 and the working cylinder 2 79 can be synchronized.

[0034] Specifically, during operation, if the three-position four-way reversing valve 1 76 and the three-position four-way reversing valve 2 77 are both in the left position, the hydraulic oil in the oil tank 71 enters the rodless chamber of the working cylinder 1 78 through the P port and the A port of the three-position four-way reversing valve 1 76 and the first oil port of the working cylinder 1 78, and the piston rod of the working cylinder 1 78 extends forward, and the hydraulic oil in the rod chamber of the working cylinder 1 78 enters the rodless chamber of the working cylinder 2 79 through the B port and the T port of the three-position four-way reversing valve 1 76 and the T port and the B port of the three-position four-way reversing valve 2 77 and the second oil port of the working cylinder 2 79, and the piston rod of the working cylinder 2 79 extends forward, and the hydraulic oil in the rod chamber of the working cylinder 2 79 flows into the oil tank 71 through the A port and the P port of the three-position four-way reversing valve 2 77. If the three-position four-way reversing valve 1 76 and the three-position four-way reversing valve 2 77 are both in the right position, the piston rods of the working cylinder 1 78 and the working cylinder 2 79 are both retracted backwards, and the specific process will not be described in detail. If the three-position four-way reversing valve 1 76 is in the left position and the three-position four-way reversing valve 2 77 is in the right position, the piston rod of the working cylinder 1 78 extends forwards and the piston rod of the working cylinder 2 79 retracts backwards, and the specific process will not be described in detail. If the three-position four-way reversing valve 1 76 is in the right position and the three-position four-way reversing valve 2 77 is in the left position, the piston rod of the working cylinder 1 78 extends forwards and the piston rod of the working cylinder 2 79 retracts backwards, and the specific process will not be described in detail.

[0035] Specifically, Figure 4 As shown, the groove-type crossbeam pushing and pressing mechanism 8 includes an oil pump 2 82, a three-position four-way reversing valve 3 85, a three-position four-way reversing valve 4 86, a working oil cylinder 3 87 and a working oil cylinder 4 88. The oil inlet end of the oil pump 2 82 is connected to the oil outlet end of the oil tank 71, the oil outlet end of the oil pump 2 82 is connected to the P port of the three-position four-way reversing valve 3 85, the A port of the three-position four-way reversing valve 3 85 is connected to the first oil port of the working oil cylinder 3 87, the B port of the three-position four-way reversing valve 3 85 is connected to the second oil port of the working oil cylinder 3 87, the T port of the three-position four-way reversing valve 3 85 is connected to the T port of the three-position four-way reversing valve 4 86, the A port of the three-position four-way reversing valve 4 86 is connected to the first oil port of the working oil cylinder 4 88, the B port of the three-position four-way reversing valve 4 86 is connected to the second oil port of the working oil cylinder 4 88, and the P port of the three-position four-way reversing valve 4 86 is connected to the oil return port of the oil tank 71. An oil filter 81 is provided between the oil tank 71 and the oil pump 82. The oil filter 81 can filter out impurities in the hydraulic oil to ensure the normal operation of the groove beam pushing and pressing mechanism 8. The oil pump 82 is connected to the P port of the three-position four-way reversing valve 85 through the second oil pipe 83. The second oil pipe 83 is provided with a second safety valve 84. By providing the second safety valve 84, the pressure in the second oil pipe 83 can be relieved when it exceeds the set value, so as to avoid excessive pressure in the second oil pipe 83 and protect the hydraulic system of the groove beam pushing and pressing mechanism 8. A pressure gauge 9 is also installed on the second oil pipe 83. The pressure gauge 9 can display the pressure in the second oil pipe 83 in real time so that the staff can check it in time.

[0036] Specifically, a one-way throttle valve 5 89 is provided between the A port of the three-position four-way reversing valve 3 85 and the first oil port of the working oil cylinder 3 87, a one-way throttle valve 6 891 is provided between the B port of the three-position four-way reversing valve 3 85 and the second oil port of the working oil cylinder 3 87, a one-way throttle valve 7 892 is provided between the A port of the three-position four-way reversing valve 4 86 and the first oil port of the working oil cylinder 4 88, and a one-way throttle valve 8 893 is provided between the B port of the three-position four-way reversing valve 4 86 and the second oil port of the working oil cylinder 4 88. The one-way regulating valve adjusts the flow of hydraulic oil in a specific direction according to actual needs, and cuts off the flow in the reverse direction, thereby protecting the hydraulic system from the influence of backflow and ensuring the stability and reliability of the system.

[0037] Specifically, the T port of the three-position four-way reversing valve 85 is connected to the T port of the four-position four-way reversing valve 86, so that the synchronization of the movement of the working cylinder 3 87 and the working cylinder 4 88 can be achieved.

[0038] Specifically, the working principle of the groove-shaped crossbeam pushing and clamping mechanism 8 is the same as the working principle of the lug-guide pushing and clamping mechanism 7, which will not be described in detail here.

[0039] See also Figure 5 This embodiment also provides a loader S-arm support welding processing method, which is used to process the loader S-arm support, including the following steps:

[0040] S1: Divide 40 ears 3 into two groups, each group has 20 ears 3, and place the two groups of ears 3 on the fixing seats 2 at both ends of the ear guide shelf 1, and then arrange 20 grooved beams 5 in sequence on the grooved beam guide shelf 4.

[0041] S2: After the support ear 3 and the grooved crossbeam 5 are placed respectively, the grooved crossbeam pushing and clamping mechanism 8 is started, and the working cylinder three 87 and the working cylinder four 88 of the grooved crossbeam pushing and clamping mechanism 8 push the grooved crossbeam 5 together until the grooved crossbeam 5 close to one end of the support ear guide shelf 1 is pushed and pressed onto the grooved crossbeam positioning surface of the positioning block 6, and the grooved crossbeam positioning surface positions the grooved crossbeam 5.

[0042] S3: Start the lug guide pushing and clamping mechanism 7. The working cylinder 1 78 and the working cylinder 2 79 of the lug guide pushing and clamping mechanism 7 push the lugs 3 at both ends until the lugs 3 close to the positioning block 6 are pushed and clamped on the lug positioning surfaces on both sides of the positioning block 6. The lug positioning surfaces position the lugs 3, and the lugs 3 and the grooved crossbeam 5 are assembled.

[0043] S4: Start the welding robot to weld and assemble the connection between the support ear 3 and the grooved crossbeam 5, hang down the welded S-arm support to cool it, and start welding the next S-arm support at the same time.

[0044] The above embodiments are only to illustrate the basic principles and characteristics of the present invention, but are not limited to the above embodiments. It should be understood that for ordinary technicians in this field, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A loader S-arm support welding tool, characterized in that: The invention comprises a lug guide shelf (1) and a groove-shaped beam guide shelf (4) for placing a groove-shaped beam (5), wherein the lug guide shelf (1) is arranged at one end of the groove-shaped beam guide shelf (4), and fixed seats (2) for placing the lugs (3) are arranged at both ends of the lug guide shelf (1), and the distance between the inner end surfaces of the two fixed seats (2) is at least equal to the length of the groove-shaped beam (5), and a positioning block (6) for positioning the lug (3) and the groove-shaped beam (5) is arranged between the two fixed seats (2), and a lug guide pushing and clamping mechanism (7) for pushing the lug (3) is arranged at one end of the two fixed seats (2) away from the positioning block (6), and a groove-shaped beam pushing and clamping mechanism (8) for pushing and clamping the groove-shaped beam (5) is arranged at one end of the groove-shaped beam guide shelf (4) away from the lug guide shelf (1).

2. The loader S-arm support welding tooling according to claim 1, characterized in that: The lug guide pushing and pressing mechanism (7) comprises an oil tank (71), a three-position four-way reversing valve (76), a three-position four-way reversing valve (77), a working oil cylinder (78) and a working oil cylinder (79); the oil outlet end of the oil tank (71) is connected to an oil pump (73); the oil outlet end of the oil pump (73) is connected to a P port of the three-position four-way reversing valve (76); the A port of the three-position four-way reversing valve (76) is connected to a first oil port of the working oil cylinder (78); the three-position four-way reversing valve (76) is connected to a first oil port of the working oil cylinder (78); The B port of the reversing valve 1 (76) is connected to the second oil port of the working oil cylinder 1 (78), the T port of the three-position four-way reversing valve 1 (76) is connected to the T port of the three-position four-way reversing valve 2 (77), the A port of the three-position four-way reversing valve 2 (77) is connected to the first oil port of the working oil cylinder 2 (79), the B port of the three-position four-way reversing valve 2 (77) is connected to the second oil port of the working oil cylinder 2 (79), and the P port of the three-position four-way reversing valve 2 (77) is connected to the oil return port of the oil tank (71).

3. The loader S-arm support welding tooling according to claim 2, characterized in that: An oil filter (72) is provided between the oil tank (71) and the oil pump (73). The oil pump (73) is connected to the P port of the three-position four-way reversing valve (76) through a first oil pipe (74). A first safety valve (75) is provided on the first oil pipe (74).

4. The loader S-arm support welding tooling according to claim 3, characterized in that: A one-way throttle valve (791) is provided between the A port of the three-position four-way reversing valve (76) and the first oil port of the working cylinder (78), a one-way throttle valve (792) is provided between the B port of the three-position four-way reversing valve (76) and the second oil port of the working cylinder (78), a one-way throttle valve (793) is provided between the A port of the three-position four-way reversing valve (77) and the first oil port of the working cylinder (79), and a one-way throttle valve (794) is provided between the B port of the three-position four-way reversing valve (77) and the second oil port of the working cylinder (79).

5. The loader S-arm support welding tooling according to claim 4, characterized in that: The groove-shaped crossbeam pushing and clamping mechanism (8) comprises an oil pump 2 (82), a three-position four-way reversing valve 3 (85), a three-position four-way reversing valve 4 (86), a working oil cylinder 3 (87) and a working oil cylinder 4 (88); the oil inlet end of the oil pump 2 (82) is connected to the oil outlet end of the oil tank (71); the oil outlet end of the oil pump 2 (82) is connected to the P port of the three-position four-way reversing valve 3 (85); the A port of the three-position four-way reversing valve 3 (85) is connected to the first oil port of the working oil cylinder 3 (87); the three The B port of the three-position four-way reversing valve (85) is connected to the second oil port of the working oil cylinder (87), the T port of the three-position four-way reversing valve (85) is connected to the T port of the three-position four-way reversing valve (86), the A port of the three-position four-way reversing valve (86) is connected to the first oil port of the working oil cylinder (88), the B port of the three-position four-way reversing valve (86) is connected to the second oil port of the working oil cylinder (88), and the P port of the three-position four-way reversing valve (86) is connected to the oil return port of the oil tank (71).

6. The loader S-arm support welding tooling according to claim 5, characterized in that: An oil filter (81) is provided between the oil tank (71) and the second oil pump (82). The second oil pump (82) is connected to the P port of the third three-position four-way reversing valve (85) through a second oil pipe (83). A second safety valve (84) is provided on the second oil pipe (83).

7. The loader S-arm support welding tooling according to claim 6, characterized in that: A one-way throttle valve five (89) is provided between the A port of the three-position four-way reversing valve three (85) and the first oil port of the working oil cylinder three (87), a one-way throttle valve six (891) is provided between the B port of the three-position four-way reversing valve three (85) and the second oil port of the working oil cylinder three (87), a one-way throttle valve seven (892) is provided between the A port of the three-position four-way reversing valve four (86) and the first oil port of the working oil cylinder four (88), and a one-way throttle valve eight (893) is provided between the B port of the three-position four-way reversing valve four (86) and the second oil port of the working oil cylinder four (88).

8. The loader S-arm support welding tooling according to claim 7, characterized in that: The first oil pipe (74) and the second oil pipe (83) are both provided with a pressure gauge (9) for detecting the oil pipe pressure.

9. A loader S-arm support welding method, characterized in that: The following steps are involved: S1: placing a plurality of ears (3) on the fixing seats (2) at both ends of the ear guide shelf (1), and placing a plurality of grooved beams (5) on the grooved beam guide shelf (4); S2: After the support ears (3) and the grooved cross beam (5) are placed respectively, the grooved cross beam pushing and pressing mechanism (8) is started, and the working cylinder of the grooved cross beam pushing and pressing mechanism (8) pushes the grooved cross beam (5) until the grooved cross beam (5) near one end of the support ear guide shelf (1) is pushed and pressed onto the grooved cross beam positioning surface of the positioning block (6); S3: starting the lug guide pushing and pressing mechanism (7), the working cylinder of the lug guide pushing and pressing mechanism (7) pushes the lugs (3) at both ends until the lugs (3) close to the positioning block (6) are pushed and pressed against the lug positioning surfaces on both sides of the positioning block (6), thereby completing the assembly of the lugs (3) and the grooved crossbeam (5); S4: welding and assembling the connection between the lug (3) and the grooved crossbeam (5), hanging down the welded S-arm support to cool it, and starting to weld the next S-arm support at the same time.

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