Telescopic arm support ear welding positioning tool and positioning method

Abstract

A welding positioning tool and positioning method for a telescopic arm support ear, belonging to the technical field of welding tool, the tool comprises: a mounting plate; a clamping assembly comprises a lifting track, and claws are slidably provided at both ends of the track; a connecting assembly comprises a sleeve and two sliders, each of which is vertically provided with an extension rod, and the rear ends of the two extension rods are coaxially provided with a worm gear, and the front end of the extension rod is used to connect the support ear; telescopic rods are coaxially passed through the two ends of the sleeve, and the circumferential relative position between the telescopic rod and the sleeve is kept fixed, and the ends of the telescopic rods are coaxially provided with worms, which are respectively meshed with the worm gears on both sides, and the rotation directions of the two worm helices are opposite. The positioning method comprises the steps: S1: tool positioning; S2: connecting the support ear; S3: adjusting the position of the support ear. This scheme can be used for positioning the symmetrically arranged support ears on the telescopic arm, has high positioning accuracy and a more convenient operation method, and can adapt to the use of telescopic arms of different models and sizes.

Description

Technical Field

[0001] The invention belongs to the technical field of welding tooling for parts of telescopic arms of engineering machinery, and in particular relates to a welding positioning tooling for a telescopic arm support ear and a positioning method. Background Art

[0002] The telescopic arms of common construction machinery are mainly of round tube structure and square tube structure. In order to ensure the stability of the left and right sides of the telescopic arms, construction machinery such as rock drills, drilling machines, and anchor bolters usually adopt the following Figure 1 The structural design shown in the figure has symmetrically structured support ears on both sides of the bottom of the telescopic arm, which are respectively used to connect the hydraulic cylinders. By symmetrically arranging the hydraulic cylinders on both sides of the telescopic arm, the telescopic arm can be effectively prevented from tilting to the left or right, thereby improving the stability of the telescopic arm when working.

[0003] Most of the ears in the above structure are fixed on the telescopic arm by welding. In order to ensure the accuracy of the relative position of the ears on both sides, especially the symmetry of the ears on both sides, special welding positioning fixtures are currently made for telescopic arms of different models and sizes, and most of the fixtures are fixed on the ground. When welding, it is necessary to use lifting equipment to lift the telescopic arm to the positioning fixture, and then position and weld the telescopic arm and the ears. This kind of positioning method leads to a large number of positioning fixtures, which not only increases the production cost of the fixtures, but also takes up a lot of space to arrange the fixtures, and requires the help of lifting equipment to complete the use, which is less convenient to use. Summary of the invention

[0004] In order to solve the shortcomings of the prior art, the present invention provides a telescopic arm support ear welding positioning tool and a positioning method, which can be used for positioning the support ears symmetrically arranged on the telescopic arm, has a more convenient operation method, and can adapt to the use of telescopic arms of different models and sizes.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0006] A telescopic arm support ear welding positioning tool comprises: a mounting plate, a clamping assembly and a connecting assembly.

[0007] The mounting plate is a flat plate structure;

[0008] The clamping assembly includes a lifting track arranged parallel to the back of the mounting plate, the lifting track is arranged to move along the height direction of the mounting plate, and claws are slidably arranged at both ends of the lifting track, and the two claws are synchronously moved toward the two ends or the middle of the lifting track with the midpoint of the mounting plate as the reference, and the claws are located below the mounting plate;

[0009] The connecting component includes two sliders arranged on the front side of the mounting plate, and the two sliders move synchronously toward the two ends or the middle of the mounting plate with the midpoint of the mounting plate as the reference. The sliders are vertically provided with extension rods, and the extension rods are arranged to rotate around the axis. The rear ends of the two extension rods are coaxially provided with worm gears, and the front ends of the extension rods are used to connect the support ears; the connecting component also includes a sleeve arranged in the middle of the front side of the mounting plate, which is parallel to the length direction of the mounting plate. Telescopic rods are coaxially passed through the two ends of the sleeve, and the circumferential relative position between the telescopic rod and the sleeve is kept fixed. The ends of the telescopic rods are coaxially provided with worms, which are respectively meshed with the worm wheels on both sides. The rotation directions of the two worm helical lines are opposite, and the sleeve is arranged to rotate around the axis.

[0010] The telescopic arm support ear welding positioning method is implemented by using the telescopic arm support ear welding positioning tooling, and the method comprises the following steps: S1: tooling positioning; S2: connecting the support ear; S3: adjusting the support ear position.

[0011] The beneficial effects of the present invention are that the tooling can be connected to telescopic arms of different models and different cross-sectional shapes, the posture of the support ears can be adjusted at multiple angles, and the symmetry of the support ears on both sides of the telescopic arm can be ensured. It can adapt to the positioning work of the support ears on telescopic arms of different models and sizes, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0013] Figure 1 A telescopic arm and a structure for setting supporting ears thereof are shown.

[0014] Figure 2 A structural schematic diagram of a preferred embodiment of the present application is shown.

[0015] Figure 3 A schematic diagram showing a telescopic arm of a rectangular tube structure using the positioning lugs of the present application is shown.

[0016] Figure 4 A schematic diagram showing a telescopic arm of a circular tube structure using the positioning lugs of the present application is shown.

[0017] Figure 5 A schematic diagram of a preferred structure of the extension rod is shown.

[0018] Figure 6 An exploded view showing a preferred structure of the extension rod.

[0019] Figure 7 A partial cross-sectional view of a preferred structure of the extension rod when the inner support plate is folded is shown.

[0020] Figure 8A partial cross-sectional view of a preferred structure of the extension rod when the inner support plate is expanded is shown.

[0021] Markings in the figure: mounting plate-1, side support rod-11, guide rod-12, sliding rod-13, hinge block-14, connecting rod-15, locking screw-16, clamping assembly-2, lifting rail-21, claw-22, V-block-221, adjusting screw-23, sliding block-24, bidirectional screw-25, connecting assembly-3, slider-31, extension rod-32, worm gear-321, countersunk hole-322, through hole-323, sleeve-33, worm gear sleeve-331, telescopic rod-34, worm-341, worm shaft-35, pressure block-36, first inclined surface-361, adjusting screw-37, inner support plate-38, rectangular block-381, avoidance groove-382, second inclined surface-383, contraction spring-39, conical block-4, connecting screw-41. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] like Figures 2 to 3 As shown, a telescopic arm support ear welding positioning tool comprises:

[0024] Specifically, it comprises a mounting plate 1 of a flat structure.

[0025] Specifically include, Figure 4 As shown, the clamping assembly 2 includes a lifting track 21 arranged parallel to the back of the mounting plate 1. The lifting track 21 is arranged to move along the height direction of the mounting plate 1. Claws 22 are respectively slidably provided at both ends of the lifting track 21, and the two claws 22 move synchronously toward the two ends or the middle of the lifting track 21 with the midpoint of the mounting plate 1 as a reference. The claws 22 are located below the mounting plate 1. Through the sliding setting of the lifting track 21, the two claws 22 can be used to clamp the opposite sides of the telescopic arm, thereby fixing the mounting plate 1 on the telescopic arm. Similarly, the claws 22 can also be used to loosen the telescopic arm by sliding, and can adapt to clamping telescopic arms with different contour diameters.

[0026] As a preferred solution, a telescopic cylinder or a linear motor may be provided at both ends of the mounting plate 1 or the lifting track 21 , respectively, to drive the two claws 22 to move along the lifting track 21 .

[0027] As another preferred solution, a bidirectional cylinder may be provided in the middle of the mounting plate 1 or the lifting track 21 to drive the two claws 22 to move synchronously and in opposite directions along the lifting track 21 .

[0028] Specifically include, Figure 2 , Figure 3 As shown, the connecting assembly 3 includes two sliders 31 arranged on the front of the mounting plate 1, and the two sliders 31 are synchronously moved toward the two ends or the middle of the mounting plate 1 with the midpoint of the mounting plate 1 as the reference. As a preferred solution, a telescopic cylinder or a linear motor can be respectively arranged at the two ends of the mounting plate 1 to drive the two sliders 31 to move along the length direction of the mounting plate 1. As another preferred solution, a bidirectional cylinder can be arranged in the middle of the mounting plate 1 to drive the two sliders 31 to move synchronously and in opposite directions along the length direction of the mounting plate 1. The sliders 31 are vertically provided with extension rods 32, and the extension rods 32 are arranged to rotate around the axis. The rear ends of the two extension rods 32 are coaxially provided with worm gears 321, and the front ends of the extension rods 32 are used to connect the lugs to be installed on the telescopic arm. Specifically, the lugs can be directly fixed to the front ends of the extension rods 32 by bolts, or the lugs can be connected to the front ends of the extension rods 32 by pins, or a socket is opened at the front ends of the extension rods 32, and the lugs are inserted into the sockets to achieve the purpose of connecting the lugs. The connecting assembly 3 also includes a sleeve 33 disposed in the middle of the front of the mounting plate 1, which is parallel to the length direction of the mounting plate 1, and can also be understood as the sleeve 33 being parallel to the lifting track 21, or being understood as the sleeve 33 being parallel to the sliding direction of the slider 31. The two ends of the sleeve 33 are coaxially penetrated with telescopic rods 34, and the circumferential relative position between the telescopic rod 34 and the sleeve 33 is kept fixed. The ends of the telescopic rod 34 are coaxially provided with worms 341, which are respectively meshed with the worm wheels 321 on both sides. The helical lines of the two worms 341 have opposite rotation directions, and the corresponding gear teeth of the two worm wheels 321 also have opposite rotation directions. The sleeve 33 is arranged to rotate around the axis to drive the two worms 341 to rotate together. Because the helical lines of the two worms 341 have opposite rotation directions, the rotation directions of the two worm wheels 321 must also be opposite, so that the angles of the ears on both sides can be adjusted synchronously through the two extension rods 32. Because the extension rod 32 and the telescopic rod 34 are connected through the worm gear 321 and the worm 341, the worm gear 321 cannot drive the worm 341 to rotate in the reverse direction. Therefore, when the slider 31 moves with the extension rod 32, the worm gear 321 will move with the worm 341, so that the telescopic rod 34 can be telescopically moved along the axis of the sleeve 33, so that the two worm gears 341 can adapt to the position change of the extension rod 32 and maintain the driving connection structure, that is, the connection structure between the worm gear 321 and the worm 341 at any time. In this way, the positioning tool can not only adjust the distance between the two side ears, but also synchronously adjust the angles of the two side ears, so as to position the ears on telescopic arms of different models and sizes to improve the positioning welding accuracy of the ears.

[0029] As a preferred solution, a motor is arranged on the front side of the mounting plate 1, with its main shaft parallel to the sleeve 33, and the main shaft of the motor is connected to the sleeve 33 through a pair of meshing gears, so that the motor can be used to drive the sleeve 33 to rotate around the axis.

[0030] The sleeve 33 can also be rotated manually. In order to prevent slipping, a knurling structure can be provided on the outer wall of the sleeve 33 to increase friction.

[0031] The method for positioning the support lug using the telescopic arm support lug welding positioning tool comprises the following steps:

[0032] S1: Positioning the tooling, supporting the bottom surface of the mounting plate 1 on the outer wall of the telescopic arm, so that the mounting plate 1 is perpendicular to the outer wall of the telescopic arm and the extension rod 32 is parallel to the outer wall of the telescopic arm, and the claws 22 on both sides are moved toward the middle synchronously, and the claws 22 are clamped on both sides of the telescopic arm, so as to fix the positioning tooling as a whole on the telescopic arm;

[0033] S2: Connecting the lug to the front end of the extension rod 32;

[0034] S3: Adjust the position of the support ear, including adjusting the distance between the support ear and the telescopic arm, the distance between the support ears on both sides and the inclination angle of the support ear. The specific adjustment method is as follows: because the lifting track 21 is set to move along the height direction of the mounting plate 1, it can also be understood that the mounting plate 1 is set to move relative to the lifting track 21 along the height direction. Therefore, after the claw 22 is fixed to the telescopic arm, the position between the lifting track 21 and the telescopic arm also remains fixed. At this time, the distance between the support ears on both sides and the telescopic arm can be adjusted simultaneously by adjusting the mounting plate 1 along the height direction; the distance between the support ears on both sides can be adjusted by moving the two sliders 31; the rotating sleeve 33 can synchronously adjust the angles of the support ears on both sides through the two extension rods 32. After the posture adjustment in the above multiple directions, the support ears on both sides can be symmetrically arranged on both sides of the telescopic arm; as a further preferred solution, the two extension rods 32 are designed as a telescopic structure, so that the position of the support ears in the length direction of the telescopic arm can be adjusted; and then the support ears can be welded and fixed to the telescopic arm by welding methods such as brazing.

[0035] Preferably, Figure 2 , Figure 4 As shown, side support rods 11 are provided on one or both sides of the bottom of the mounting plate 1, and the bottom surface of the side support rods 11 is perpendicular to the height direction of the mounting plate 1 and flush with the bottom surface of the mounting plate 1. The side support rods 11 can increase the contact area between the bottom surface of the mounting plate 1 and the outer wall of the telescopic arm, thereby ensuring that the mounting plate 1 is perpendicular to the outer wall of the telescopic arm during the initial positioning.

[0036] Preferably, Figure 4 As shown, an adjusting screw 23 parallel to the height direction is provided on the back of the mounting plate 1. The adjusting screw 23 passes through the lifting track 21 through a threaded structure. By rotating the adjusting screw 23, the position of the lifting track 21 in the height direction of the mounting plate 1 can be adjusted, which can also be understood as adjusting the position of the mounting plate 1 relative to the claw 22.

[0037] Preferably, Figure 4 As shown, the upper ends of the claws 22 are all arranged on a sliding block 24, and the sliding block 24 is slidably arranged on the lifting track 21. A bidirectional screw 25 is arranged in parallel on one side of the lifting track 21, and its two ends have screws with opposite rotation directions. The two ends of the bidirectional screw 25 pass through the two sliding blocks 24 by threaded connection respectively. By rotating the bidirectional screw 25, the two sliding blocks 24 can be synchronously moved toward the two ends or the middle of the lifting track 21 with the midpoint of the mounting plate 1 as the reference, thereby driving the claws 22 to move; the bidirectional screw 25 is rotated manually.

[0038] Preferably, Figures 2 to 4 As shown, a V-shaped block 221 is provided on the opposite side of the lower end of the two claws 22, and a symmetrically arranged V-shaped groove is opened on the opposite side of the two V-shaped blocks 221, and the extension direction of the V-shaped groove is perpendicular to the mounting plate 1, so that the claws 22 can not only clamp the telescopic arm of the rectangular tube structure, but also clamp the telescopic arm of the circular tube structure.

[0039] Preferably, Figure 2 , Figure 3 As shown, a worm gear sleeve 331 is coaxially arranged on the outside of the sleeve 33, and a worm shaft 35 meshing with the worm gear sleeve 331 is vertically penetrated through the front of the mounting plate 1. When the worm shaft 35 is rotated, the sleeve 33 can be driven to rotate through the worm gear sleeve 331, thereby driving the two telescopic rods 34 to rotate. In addition, adopting this driving structure design can further prevent the sleeve 33 from rotating when the slider 31 slides, thereby keeping the inclination angle of the support ear constant; the worm shaft 35 is rotated manually.

[0040] Preferably, Figure 2 , Figure 3 As shown, two parallel guide rods 12 are provided on the front side of the mounting plate 1 . The guide rods 12 are parallel to the length direction of the mounting plate 1 , and the two sliders 31 are slidably connected to the two guide rods 12 .

[0041] Preferably, Figures 2 to 4 As shown, a slide bar 13 perpendicular to the bottom surface is provided on the top of the mounting plate 1, and a hinge block 14 is slidably sleeved on the slide bar 13. Connecting rods 15 are rotatably provided on the two ends of the hinge block 14 in the length direction of the mounting plate 1. The ends of the connecting rods 15 are rotatably connected to the two sliders 31. Locking screws 16 are provided on the side of the hinge block 14 for fixing the position of the hinge block 14 on the slide bar 13. With the above-mentioned structural design, by moving the hinge block 14 along the slide bar 13, the two sliders 31 can be synchronously driven to move in the same or opposite directions through the two connecting rods 15, so as to adjust the distance between the ears on both sides. When the adjustment is completed, the locking screws 16 can be tightened to fix the slider 31, so as to achieve the purpose of fixing the distance between the ears on both sides.

[0042] Preferably, Figures 5 to 8As shown, a countersunk hole 322 is coaxially opened at the front end of the extension rod 32, and a through hole 323 vertically connected to the countersunk hole 322 is opened on the side of the front end of the extension rod 32, and the through hole 323 is located in the middle section of the countersunk hole 322. The cross-sections of the through hole 323 and the countersunk hole 322 are both rectangular, and a pressure block 36 is slidably penetrated at the rear section and the front section of the countersunk hole 322, and the pressure block 36 has a first inclined surface 361 on both sides of the same opposite end.

[0043] An adjusting screw 37 is coaxially penetrated at the front end of the extension rod 32, and its distal end is rotatably penetrated at the bottom of the countersunk hole 322, and the front end protrudes from the front end surface of the extension rod 32, so that the adjusting screw 37 can be manually rotated using a tool, or connected to an adjusting motor. The two ends of the adjusting screw 37 have threaded rods with opposite rotation directions, and the midpoint of the two threaded rods is located on the axis of the through hole 323. The threaded rods at both ends of the adjusting screw 37 pass through the two pressure blocks 36 respectively. By rotating the adjusting screw 37, the two pressure blocks 36 can be driven to move synchronously toward the midpoint or both ends of the adjusting screw 37.

[0044] An inner support plate 38 is provided on both sides of the front end of the extension rod 32, and the two inner support plates 38 are connected by a contraction spring 39 for retracting the two inner support plates 38 toward the extension rod 32. The inner walls of the inner support plates 38 are provided with rectangular blocks 381, and the rectangular blocks 381 of the two inner support plates 38 are respectively penetrated at both ends of the through hole 323, and the two sides of the front end of the rectangular block 381 are respectively in sliding contact with the first inclined surfaces 361 on the corresponding two sides.

[0045] The connecting assembly 3 also includes a conical block 4, one end of which is coaxially provided with a connecting screw 41. The connecting screw 41 is used to vertically connect the outer end of the inner support plate 38. After the connection, the conical blocks 4 on both sides of the same extension rod 32 are in a coaxial state.

[0046] Clamping principle, such as Figure 1As shown, when the ears on both sides of the telescopic arm are respectively provided with connecting blocks in pairs to increase the structural strength, the two ears arranged in pairs usually need to be arranged at intervals; when using this solution, firstly, by rotating the adjusting screw 37, the rectangular blocks 381 on both sides are pushed by the first inclined surface 361, so as to adjust the spacing between the two inner support plates 38, which is used to limit the distance between the two ears arranged in pairs; the two ears are respectively placed on the outer ends of the two inner support plates 38, and the connecting screw 41 is passed through the mounting hole on the ear for passing the pin shaft, so that the connecting screw 41 is connected to the inner support plate 38, and the conical block 4 is rotated to tighten the connecting screw 41, and the mounting hole of the ear is pressed by the conical surface of the conical block 4, so that the mounting holes of the two ears are coaxial. After that, the distance between the two side ears can be adjusted by moving the slider 31, and then the angle of the ears can be adjusted by rotating the extension rod 32, so that the two pairs of ears can be fixed at symmetrical positions on the telescopic arm; after positioning welding, the two pressing blocks 36 can be moved in opposite directions by rotating the adjusting screw 37, and after the rectangular block 381 loses the thrust of the first inclined surface 361, the two inner support plates 38 will automatically close to the telescopic rod 34 under the action of the contraction spring 39. This adjustment structure can make the extension rod 32 always in the middle position of the two inner support plates 38, so that the two ears arranged in pairs are symmetrically arranged on both sides of the front end of the extension rod 32, and by adjusting the pressure blocks 36, the inner support plates 38 can also adapt to the ears with different spacing requirements. As a preferred structure, the front end of the rectangular block 381 is opened and closed with an avoidance groove 382 for avoiding the adjusting screw 37, so that the inner support plate 38 has a larger range of movement. As a preferred structure, the front end of the rectangular block 381 has a second inclined surface 383 that slidably cooperates with the first inclined surface 361 to improve the stability when pushing the inner support plate 38 and ensure the stability of the position of the inner support plate 38 when supporting the support ears.

[0047] The above description is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A telescopic arm support ear welding positioning tool, characterized in that: include: The mounting plate (1) is a flat plate structure; The clamping assembly (2) comprises a lifting track (21) arranged parallel to the back of the mounting plate (1), the lifting track (21) being arranged to move along the height direction of the mounting plate (1), claws (22) being slidably arranged at both ends of the lifting track (21), and the two claws (22) being arranged to move synchronously toward the two ends or the middle of the lifting track (21) with the midpoint of the mounting plate (1) as a reference, and the claws (22) being located below the mounting plate (1); an adjusting screw rod (23) being arranged parallel to the height direction on the back of the mounting plate (1), and the adjusting screw rod (23) passing through the lifting track (21) via a threaded structure; The connecting assembly (3) comprises two sliders (31) arranged on the front side of the mounting plate (1), and the two sliders (31) are synchronously moved toward the two ends or the middle of the mounting plate (1) with the midpoint of the mounting plate (1) as a reference, and the sliders (31) are vertically provided with extension rods (32), and the extension rods (32) are rotatably arranged around an axis, and the rear ends of the two extension rods (32) are coaxially provided with worm gears (321), and the front ends of the extension rods (32) are used for connecting the support ears; the connecting assembly (3) also comprises a slider arranged on the mounting plate (1) A sleeve (33) is provided in the middle of the front of the mounting plate (1) and is parallel to the length direction of the mounting plate (1). Telescopic rods (34) are coaxially provided at both ends of the sleeve (33). The circumferential relative positions of the telescopic rods (34) and the sleeve (33) are kept fixed. A worm (341) is coaxially provided at the ends of the telescopic rods (34). The worms (341) are respectively meshed with worm wheels (321) on both sides. The helical lines of the two worms (341) have opposite rotation directions. The sleeve (33) is arranged to rotate around the axis.

2. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: One side or both sides of the bottom of the mounting plate (1) are provided with side support rods (11), the bottom surface of which is perpendicular to the height direction of the mounting plate (1) and flush with the bottom surface of the mounting plate (1).

3. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: The upper ends of the claws (22) are each provided on a sliding block (24), and the sliding block (24) is slidably provided on the lifting track (21). A bidirectional screw rod (25) is provided in parallel on one side of the lifting track (21), and the two ends of the bidirectional screw rod (25) have screw rods with opposite rotation directions. The two ends of the bidirectional screw rod (25) respectively pass through the two sliding blocks (24) in a threaded connection manner.

4. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: A V-shaped block (221) is provided on one side opposite to the lower ends of the two claws (22), and symmetrically arranged V-shaped grooves are provided on one side opposite to the two V-shaped blocks (221), wherein the extending direction of the V-shaped grooves is perpendicular to the mounting plate (1).

5. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: A worm gear sleeve (331) is coaxially arranged outside the sleeve (33), and a worm shaft (35) meshing with the worm gear sleeve (331) is vertically penetrated through the front surface of the mounting plate (1).

6. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: The entire mounting plate (1) is provided with two parallel guide rods (12), the guide rods (12) are parallel to the length direction of the mounting plate (1), and the two sliding blocks (31) are slidably connected to the two guide rods (12).

7. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: A slide bar (13) perpendicular to the bottom surface is provided on the top of the mounting plate (1), a hinge block (14) is slidably sleeved on the slide bar (13), and connecting rods (15) are rotatably provided at both ends of the hinge block (14) in the length direction of the mounting plate (1), and the ends of the connecting rod (15) are rotatably connected to the two sliders (31), and a locking screw (16) is provided on the side of the hinge block (14) for fixing the position of the hinge block (14) on the slide bar (13).

8. The telescopic arm support ear welding positioning tool according to claim 1, characterized in that: A countersunk hole (322) is coaxially formed at the front end of the extension rod (32), a through hole (323) vertically connected to the countersunk hole (322) is formed at the side of the front end of the extension rod (32), the through hole (323) is located in the middle section of the countersunk hole (322), the cross sections of the through hole (323) and the countersunk hole (322) are both rectangular, a pressure block (36) is slidably penetrated at the rear section and the front section of the countersunk hole (322), and the pressure block (36) has first inclined surfaces (361) on both sides of the same opposite end; An adjusting screw (37) is coaxially passed through the front end of the extension rod (32), the rear end of which is rotatably passed through the bottom of the countersunk hole (322), and the front end protrudes from the front end surface of the extension rod (32). The two ends of the adjusting screw (37) have threaded rods with opposite rotation directions, and the midpoints of the two threaded rods are located on the axis of the through hole (323). The threaded rods at the two ends of the adjusting screw (37) pass through the two pressing blocks (36) in a threaded connection manner. An inner support plate (38) is provided on both sides of the front end of the extension rod (32), and the two inner support plates (38) are connected by a contraction spring (39) for retracting the two inner support plates (38) toward the extension rod (32). The inner walls of the inner support plates (38) are provided with rectangular blocks (381), and the rectangular blocks (381) of the two inner support plates (38) are respectively penetrated at both ends of the through hole (323), and the two sides of the front end of the rectangular block (381) are respectively in sliding contact with the first inclined surfaces (361) on the corresponding two sides; The connecting assembly (3) further comprises a conical block (4), one end of which is coaxially provided with a connecting screw (41). The connecting screw (41) is used to vertically connect the outer end of the inner support plate (38). After the connection, the conical blocks (4) on both sides of the same extension rod (32) are in a coaxial state.

9. A method for welding and positioning a telescopic arm support lug, characterized in that: The method is implemented by using the telescopic arm support ear welding positioning tooling described in any one of claims 1 to 8, and comprises the following steps: S1: Positioning the tooling, supporting the bottom surface of the mounting plate (1) on the outer wall of the telescopic arm, and synchronously moving the claws (22) on both sides toward the middle, and using the claws (22) to clamp on both sides of the telescopic arm; S2: connecting the lug to the front end of the extension rod (32); S3: Adjust the position of the support ear, including adjusting the distance between the support ear and the telescopic arm, the distance between the support ears on both sides and the inclination angle of the support ear, and positioning the support ear.

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