A positioning and fixing device for hydraulic cylinder welding

Abstract

The present invention discloses a positioning and fixing device for welding a hydraulic oil cylinder, which belongs to the technical field of fixing devices, and comprises a workbench, a base is fixedly arranged on the right part of the upper surface of the workbench, a tailstock is slidably arranged on the left part of the upper surface of the workbench, and a mounting seat is rotatably connected to the upper surface of the base. When fixing the cylinder body, the present invention fixes the right end of the cylinder body with a chuck, and at the same time, a lifting device and a supporting device slide to the bottom of the cylinder body, so that the supporting device supports the left part of the cylinder body, and then the mounting seat is rotated to drive the cylinder body and the supporting device to rotate until the cylinder body is in a left-right direction position, at which time the hinged part is located below the limit leveling device on the upper end surface of the hinged part, and the lifting device pushes the supporting device to move upward, so that the supporting device lifts the left end of the cylinder body upward, and then lifts the hinged part, and cooperates with the limit leveling device on the upper end surface of the hinged part to limit the hinged part, so as to achieve the purpose of fixing the cylinder body while making the upper end surface of the hinged part in a horizontal state.

Description

Technical Field

[0001] The invention relates to a fixing device, in particular to a positioning fixing device for welding a hydraulic oil cylinder. Background Art

[0002] The existing hydraulic cylinder includes a cylinder body, end covers are fixedly provided at both ends of the cylinder body, and a hinge part is fixedly provided on the outer side surface of the end cover, and the upper end surface and the lower end surface of the hinge part are both horizontal planes; a piston with a piston rod is slidably provided inside the cylinder body, and the piston divides the inner cavity of the cylinder body into an upper cavity and a lower cavity; when processing the hydraulic cylinder, two joint seats need to be welded on the outer surface of the cylinder body, oil holes 5 are provided on the upper end surfaces of the two joint seats, and two through holes 6 are provided at positions corresponding to the joint seats on the outer surface of the cylinder body, and the oil holes 5 of the two joint seats are connected with the upper cavity and the lower cavity respectively through the corresponding through holes 6; the joint seat is used to connect the hydraulic oil pipe, so that the two hydraulic oil pipes are connected with the upper cavity and the lower cavity respectively through the joint seat; the movement of the piston in the cylinder body is realized by the oil inlet and outlet of the hydraulic oil pipe, and then the extension and retraction of the piston rod are realized, and then the basic function of the hydraulic cylinder is realized, that is, to promote the target reciprocating linear motion.

[0003] The current method of welding the joint seat is to first fix the cylinder body on a lathe and make the upper end surface of the hinge part in a horizontal state, and then first weld one of the joint seats to the left end portion of the cylinder body (at this time, neither the joint seat nor the cylinder body has an opening). During welding, the side of the joint seat is made perpendicular to the upper end surface of the hinge part, and then the cylinder body is removed and placed on a drilling machine, and a hole is punched on the upper end surface of the joint seat until it is connected to the inner cavity of the cylinder body. The hole punched by the joint seat is the oil hole, and at the same time, a hole is punched at a position symmetrical to the right end of the cylinder body and the joint seat, which is a through hole 6. Then, the cylinder body with the holes punched is re-fixed on the lathe and the upper end surface of the hinge part is made in a horizontal state. Then, another joint seat with the oil hole 5 already punched is placed at the through hole 6 at the right end of the cylinder body for welding. After welding is completed, the welding work of the joint seat of the hydraulic cylinder is completed.

[0004] Currently, the welding method of the joint seat is to use a robot arm to hold a welding gun, so that the robot arm uses the welding gun to weld the joint seat.

[0005] The above-mentioned welding method requires positioning the position of the cylinder body twice on a lathe, that is, to make the upper end surface of the hinge part in a horizontal state. In particular, when the cylinder body is fixed for the second time, if the upper end surface of the hinge part is not in a horizontal state, the line connecting the centers of the two welded joint seats will be not parallel to the X-axis. In particular, the cylinder body is heavy and long. When leveling the upper end surfaces of the cylinder body fixing and hinge parts, it is not convenient to adjust, which affects the quality and processing efficiency of the finished product and even causes rework. At the same time, the process of welding the joint seat and the punching process in the above-mentioned prior art are carried out separately, which reduces the quality and production efficiency of the finished product. Summary of the invention

[0006] The purpose of the present invention is to provide a positioning and fixing device for hydraulic cylinder welding, which can ensure that the upper end surface of the cylinder body hinge is in a horizontal state while fixing the cylinder body, and can weld two joint seats at the same time through one fixation, thereby greatly improving the welding quality and welding efficiency, and solving the problems of low welding quality and welding efficiency caused by multiple fixations in the prior art.

[0007] The present invention adopts the following technical scheme: a positioning and fixing device for hydraulic cylinder welding, comprising a workbench, a base is fixedly arranged on the right part of the upper surface of the workbench, a tailstock is slidably arranged on the left part of the upper surface of the workbench, the upper surface of the base is rotatably connected to a mounting seat, a driving device is arranged on the mounting seat, the driving device is used to drive the mounting seat to rotate, the internal rotation of the mounting seat is connected to a chuck, the chuck is used to clamp and fix the right end of the cylinder body, the upper end surface of the workbench is provided with a limiting and leveling device on the upper end surface of the hinge part, the upper end surface of the workbench is slidably provided with a lifting device along the circumference of a virtual circle formed with the rotating axis of the mounting seat as the axis, the output end of the lifting device is connected to a supporting device, and the supporting device is used to support the left part of the cylinder body; a positioning device of a joint seat is arranged on the workbench, the positioning device of the joint seat is used to locate the positions of two joint seats, so that the two joint seats are respectively located at the two ends of the outer surface of the cylinder body, and the center line of the two joint seats is horizontal with the axis of the cylinder body, and the vertical side surfaces of the two joint seats are perpendicular to the upper end surface of the hinge part.

[0008] Furthermore, the limiting and leveling device of the upper end surface of the hinged part includes a vertical plate fixedly arranged on the upper end surface of the workbench, and the limiting plate is arranged on the front side surface of the vertical plate for sliding up and down. The lower end surface of the limiting plate is a horizontal plane. When the upper end surface of the hinged part is completely in contact with the lower end surface of the limiting plate, it represents that the upper end surface of the hinged part is in a horizontal state; an adjusting device is arranged on the vertical plate, and the adjusting device is used to drive the limiting plate to move up and down, and at the same time, the adjusting device can realize the locking of the limiting plate at any position.

[0009] Furthermore, a vertical slider is fixedly provided on the outer surface of the limit plate, and the vertical slider and the vertical plate are slidably arranged in the up and down directions. A positioning plate is hinged on the front side surface of the vertical slider located below the limit plate. When the outer end of the positioning plate rotates upward, the upper end surface of the positioning plate can completely coincide with the lower end surface of the limiting plate, and then stop rotating due to the limitation of the lower end surface of the limiting plate. At this time, the lower end surface of the positioning plate is a horizontal plane, and a torsion spring is provided at the hinge position between the positioning plate and the vertical slider. The torsion spring drives the outer end of the positioning plate to always rotate downward. A limiting block is provided on the vertical slider located below the positioning plate. The limiting block limits the downward rotation distance of the outer end of the positioning plate; a driving inclined surface is provided at the front end of the positioning plate.

[0010] Furthermore, the adjusting device includes a first threaded rod arranged in the vertical slider along the up and down directions, the first threaded rod is threadedly connected to the vertical slider, the first threaded rod is rotatably connected to the vertical plate through the top plate, a scale needle is fixedly arranged on the left side of the vertical slider, and a scale line is arranged on the left side of the vertical plate.

[0011] Furthermore, the lower end surface of the limit plate is provided with a start normally open contact and a stop normally closed contact, the start normally open contact is located on the rear side of the stop normally closed contact, the start normally open contact and the stop normally closed contact are auxiliary contacts of the start control contactor of the first hydraulic telescopic rod, and are used to control the start and stop of the first hydraulic telescopic rod.

[0012] Furthermore, a support plate is fixedly provided on the upper end surface of the workbench in the vertical direction, a fixed plate is fixedly provided on the front side surface of the support plate, a sliding plate is slidably provided on the front side surface of the support plate above the fixed plate in the up and down directions, two guide rods are provided on the lower end surface of the sliding plate, the bottom ends of the two guide rods pass through the fixed plate and are provided with a clamping device, a second hydraulic telescopic rod is fixedly provided on the upper end surface of the fixed plate, and the output end of the second hydraulic telescopic rod is fixedly provided to the sliding plate.

[0013] Furthermore, the clamping device includes a mounting block which is slidably arranged on the guide rod up and down, a sliding cavity is provided on the lower end surface of the mounting block, two movable blocks are slidably arranged in the sliding cavity of the mounting block along the front-rear direction, the two movable blocks are located on both sides of the guide rod, clamping blocks are fixedly arranged on the lower end surfaces of the two movable blocks, a cone is fixedly arranged on the bottom end of the guide rod, an arc surface matching the cone is provided on the side surfaces adjacent to the two movable blocks, and clamping springs are fixedly arranged between the outer side surfaces of the two movable blocks and the inner side wall of the sliding cavity of the mounting block.

[0014] Furthermore, a third hydraulic telescopic rod is fixedly provided on the lower end surface of the sliding plate, a push rod is fixedly provided on the output end of the third hydraulic telescopic rod, the push rod passes through the fixed plate downward and is fixedly provided with a connecting plate, and both ends of the connecting plate are fixedly provided with corresponding mounting blocks.

[0015] Furthermore, a fourth hydraulic telescopic rod is fixedly provided on the front side surface of the support plate, a slide plate is fixedly provided on the output end of the fourth hydraulic telescopic rod, two driving motors are fixedly provided on the front side surface of the slide plate, a transmission shaft is vertically provided inside the guide rod, the top end of each transmission shaft is fixedly provided with the output shaft of the corresponding driving motor, a mounting sleeve is fixedly provided on the bottom end of the transmission shaft, a drill bit is installed on the lower end surface of the mounting sleeve, the drill bit and the mounting sleeve are both located in a vertical cavity coaxially opened inside the guide rod, a blocking block is coaxially fixedly provided in the vertical cavity of the guide rod, the drill bit and the blocking block are sleeved, and a plurality of inclined holes connected to the vertical cavity are evenly provided on the outer surface of the cone along the circumference.

[0016] Furthermore, the left ends of the sliding plate, fixed plate and connecting plate are all provided with telescopic holes, and the sliding plate, fixed plate and connecting plate are all provided with telescopic plates that can be slid left and right through the telescopic holes, and the left ends of the two upper telescopic plates are fixedly provided with movable plates, and the left end of the lowest telescopic plate is fixedly provided with the mounting block on the left, and the guide rods on the left side pass through the two movable plates and the mounting block on the left; the two movable plates and the mounting block on the left are connected together through the side plates, and the front side surface of the side plate is threadedly connected with a second threaded rod through the fixed block, the right end of the second threaded rod is rotatably connected to the fixed plate through the end block, and the left end of the second threaded rod passes through the support rod fixedly provided with the support plate, and the second threaded rod is rotatably connected to the support rod.

[0017] 1. The present invention provides a limiting and leveling device, a lifting device and a supporting device on the upper end surface of the hinge part, and enables the chuck to rotate. When the cylinder body is fixed, the mounting seat rotates so that the chuck faces the front, and the chuck fixes the right end of the cylinder body. At the same time, the lifting device and the supporting device slide to the bottom of the cylinder body, so that the supporting device supports the left part of the cylinder body. Then the mounting seat is rotated to drive the cylinder body and the supporting device to rotate until the cylinder body is in the left and right direction positions and the axis of the cylinder body is parallel to the X-axis. At this time, the hinge part is located below the limiting and leveling device on the upper end surface of the hinge part, and the lifting device pushes the supporting device to move upward, so that the supporting device lifts the left end of the cylinder body upward, and then lifts the hinge part, and cooperates with the limiting and leveling device on the upper end surface of the hinge part to limit the hinge part, forcing the upper end surface of the hinge part to be in a horizontal state, thereby achieving the purpose of fixing the cylinder body and making the upper end surface of the hinge part in a horizontal state.

[0018] 2. The present invention sets a positioning device. After the cylinder body is fixed and the upper end surface of the hinged part is in a horizontal state, the two joint seats are respectively located at the two ends of the outer surface of the cylinder body through the positioning device, and the center line of the two joint seats is horizontal with the axis of the cylinder body, and the vertical side surfaces of the two joint seats are perpendicular to the upper end surface of the hinged part. Then the robot arm uses a welding gun to weld the joint seat and the cylinder body together, thereby achieving the purpose of welding the two joint seats at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 It is a front view structural schematic diagram of the present invention;

[0021] Figure 3 It is a left-side structural schematic diagram of the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the chuck in the present invention being rotated to face the front side through the mounting seat;

[0023] Figure 5It is a schematic diagram of the three-dimensional structure of the V-shaped card block in the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the positioning plate in the present invention;

[0025] Figure 7 It is a left-side structural schematic diagram of the positioning plate in the present invention;

[0026] Figure 8 It is a schematic diagram of the internal three-dimensional structure of the limiting plate in the present invention;

[0027] Fig. 9 It is a schematic diagram of the internal structure of the limiting plate in the present invention;

[0028] Fig.10 For the present invention Fig. 9 A schematic diagram of the structure enlargement at point A;

[0029] Fig.11 It is a schematic diagram of the three-dimensional structure of the vertical plate in the present invention;

[0030] Fig.12 It is a schematic structural diagram of a state in which the hinge part of the present invention rotates slightly clockwise based on the horizontal state;

[0031] Fig.13 It is a schematic structural diagram of a state in which the hinge part of the present invention rotates slightly counterclockwise based on the horizontal state;

[0032] Fig.14 It is a schematic diagram of the structure of the state in which the hinged part of the present invention is completely inserted under the positioning plate;

[0033] Fig.15 It is a schematic diagram of the structure of the state in which the first hydraulic telescopic rod in the present invention pushes the left end of the cylinder body upward through the V-shaped clamping block so that the upper end surface of the hinge part and the lower end surface of the positioning plate completely overlap;

[0034] Fig.16 It is a schematic diagram of the three-dimensional structure of the support plate in the present invention;

[0035] Fig.17 It is a front view structural schematic diagram of the support plate in the present invention;

[0036] Fig.18 It is a schematic diagram of the internal three-dimensional structure of the mounting block in the present invention;

[0037] Fig.19 It is a schematic diagram of the three-dimensional structure of the guide rod in the present invention;

[0038] Fig. 20 It is a schematic diagram of the internal three-dimensional structure of the guide rod in the present invention. DETAILED DESCRIPTION

[0039] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0040] See also Figure 1-20 The positioning and fixing device for welding a hydraulic cylinder of the present invention comprises a workbench 7, a base 8 is fixedly arranged on the right part of the upper surface of the workbench 7, a tailstock 9 is slidably arranged on the left part of the upper surface of the workbench 7, a mounting seat 10 is rotatably connected to the upper surface of the base 8, a driving device is arranged on the mounting seat 10, the driving device is used to drive the mounting seat 10 to rotate, a chuck 11 is rotatably connected inside the mounting seat 10, the chuck 11 is used to clamp and fix the right end of the cylinder body 1, a limiting and leveling device on the upper end surface of the hinge 3 is arranged on the upper end surface of the workbench 7, and the upper end surface of the workbench 7 is along the mounting seat 10 The circumference of the virtual circle formed by the rotating axis of the axis is provided with an arc-shaped slide rail, and a jacking device is slidably provided in the arc-shaped slide rail. The output end of the jacking device is connected to a supporting device, and the supporting device is used to support the left part of the cylinder body 1; the driving device drives the mounting seat 10 to rotate so that the chuck 11 faces the front, which is convenient for fixing the cylinder body 1. The chuck 11 fixes the right end of the cylinder body 1. At the same time, the jacking device and the supporting device slide to the bottom of the cylinder body 1 using the arc-shaped slide rail, so that the supporting device supports the left part of the cylinder body 1, and then the mounting seat 10 is rotated to drive the cylinder body 1 and the supporting device to rotate until the cylinder body 1 is at the left and right positions. When the hinge 3 is lifted up, the limit position of the limit leveling device on the upper end surface of the hinge 3 is adjusted to a horizontal state, and the cylinder 1 is rotated by the chuck 11; the cylinder 1 can be supported and fixed to the support structure 12; and the support structure 12 is ... At the same time, the purpose of automatically adjusting the horizontal state of the hinged part 3 is achieved; then the ejector pin of the tailstock 9 contacts the hinged part 3 on the left side of the cylinder body 1, and finally the cylinder body 1 is fixed; a positioning device of the joint seat 4 is also provided on the workbench 7, and the positioning device of the joint seat 4 is used to locate the positions of the two joint seats 4, so that the two joint seats 4 are respectively located at the two ends of the outer surface of the cylinder body 1, and the center line of the two joint seats 4 is horizontal with the axis of the cylinder body 1, and the vertical side surfaces of the two joint seats 4 are perpendicular to the upper end surface of the hinged part 3, and then the robot arm uses a welding gun 68 to weld the joint seat 4 and the cylinder body 1 together.

[0041] In this embodiment, the limit and leveling device on the upper end surface of the hinged part 3 includes a vertical plate 12 fixedly arranged on the upper end surface of the workbench 7, and a limit plate 13 is provided on the front side surface of the vertical plate 12 for sliding up and down. The lower end surface of the limit plate 13 is a horizontal plane. When the upper end surface of the hinged part 3 is completely in contact with the lower end surface of the limit plate 13 after rotation, it represents that the upper end surface of the hinged part 3 is in a horizontal state; an adjusting device is provided on the vertical plate 12, and the adjusting device is used to drive the limit plate 13 to move up and down, and the adjusting device can realize the locking of the limit plate 13 at any position; when in use, for hydraulic cylinders of different specifications, the right end of the hydraulic cylinder is stuck by the chuck 11 When fixed, the height of the upper end surface of the hinge part 3 when in a horizontal state is different, and when the same batch of hydraulic cylinders are produced, after the cylinder body 1 is fixed by the chuck 11, the height of the upper end surface of the hinge part 3 at the left end when in a horizontal state is the same. Therefore, when processing the same batch of cylinder bodies 1, the height of the limit plate 13 is adjusted by the adjustment device, so that after the lower end surface of the limit plate 13 is completely fixed to the right end of the cylinder body 1, the upper end surface of the hinge part 3 at the left end of the cylinder body 1 is completely consistent when in a horizontal state, and the joint seat 4 of the same batch of cylinder bodies 1 can be welded; the position of the limit plate 13 only needs to be adjusted when replacing hydraulic cylinders of different specifications.

[0042] In order to achieve the purpose of automatic leveling of the upper end surface of the hinged portion 3 when the cylinder body 1 is fixed, in this embodiment, a vertical slider 14 is fixedly provided on the outer surface of the limit plate 13, and the vertical slider 14 and the vertical plate 12 are slidably arranged in the up and down directions. A positioning plate 15 is hinged on the front side surface of the vertical slider 14 located below the limit plate 13. When the outer end of the positioning plate 15 rotates upward, the upper end surface of the positioning plate 15 can completely coincide with the lower end surface of the limit plate 13, and then stop rotating due to the limitation of the lower end surface of the limit plate 13. At this time, the lower end surface of the positioning plate 15 is a horizontal plane, and a torsion spring 16 is provided at the position where the positioning plate 15 is hinged to the vertical slider 14. The torsion spring 16 drives the positioning plate 1 The outer end of 5 always rotates downward, and a limit block 17 is provided on the vertical slider 14 located below the positioning plate 15, and the limit block 17 limits the downward rotation distance of the outer end of the positioning plate 15; the front end of the positioning plate 15 is provided with a driving inclined surface 18; when in use, the height of the vertical slider 14 is first adjusted by the adjusting device, so that when the upper end surface of the positioning plate 15 is horizontal and completely coincides with the lower end surface of the limit plate 13, the height of the lower end surface of the positioning plate 15 completely coincides with the upper end surface of the hinge 3 when the hydraulic cylinder of the corresponding specification is fixed with the chuck 11; then firstly, the mounting seat 10 is rotated by the driving device so that the chuck 11 faces forward, and at the same time, the jacking device and the supporting device are slid to the set The right end of the cylinder body 1 is fixed on the chuck 11, and the lifting device drives the supporting device to move upward, so that the supporting device contacts the left part of the outer surface of the cylinder body 1 and the lifting device stops moving upward after the initial support is achieved, and the supporting device does not perform leveling; the mounting seat 10 is then rotated by the driving device, so that the mounting seat 10 drives the cylinder body 1 to rotate, so that the left end of the cylinder body 1 contacts the positioning plate 15, and the positioning plate 15 is driven by the driving inclined surface 18 to overcome the torsion of the torsion spring 16 and rotate upward until the hinge 3 at the left end of the cylinder body 1 is located under the positioning plate 15. At this time, the lifting device lifts the left end of the cylinder body 1 upward through the supporting device, so that the hinge 3 at the left end of the cylinder body 1 The upper end surface is completely fitted with the lower end surface of the positioning plate 15. During the process of the upper end surface of the hinge part 3 being completely fitted with the lower end surface of the positioning plate 15, the hinge part 3 and the cylinder body 1 drive the chuck 11 to rotate slightly so that the upper end surface of the hinge part 3 is completely overlapped with the lower end surface of the positioning plate 15, reaching a horizontal state, thereby achieving the purpose of adjusting the upper end surface of the hinge part 3 to a horizontal state, so as to ensure the positioning device of the joint seat 4, fix the two joint seats 4 at the left and right ends of the cylinder body 1, and the center line of the two joint seats 4 is horizontal with the axis of the cylinder body 1, and the vertical side surfaces of the two joint seats 4 are perpendicular to the upper end surface of the hinge part 3, and then the robotic arm uses a welding gun 68 to weld the joint seat 4 to the cylinder body 1.

[0043] During the process that the hinged part 3 at the left end of the cylinder body 1 drives the positioning plate 15 to overcome the torsion force of the torsion spring 16 and rotate upward until the hinged part 3 at the left end of the cylinder body 1 is located below the positioning plate 15, the position state of the hinged part 3 at the left end of the cylinder body 1 can be divided into two situations: one is the state in which the hinged part 3 rotates slightly clockwise based on the horizontal state, such as Fig.12 As shown in the figure, the hinge part 3 first contacts the driving inclined surface 18 of the positioning plate 15, and forces the positioning plate 15 to lift up. The positioning plate 15 reacts the hinge part 3 through the force of the torsion spring 16, so that the hinge part 3 rotates counterclockwise until the hinge part 3 rotates slightly counterclockwise with the horizontal state as the reference. The side of the hinge part 3 that contacts the positioning plate 15 enters the lower part of the hinge part 3. When the cylinder body 1 is in the left-right direction, the hinge part 3 is completely located below the positioning plate 15. At this time, since the right end of the cylinder body 1 is clamped by the chuck 1 1 is fixed, and the left end of the cylinder body 1 is slightly drooping (the cylinder body 1 has a certain length. When only the right end of the cylinder body 1 is fixed, the left end of the cylinder body 1 will droop. At this time, the supporting device is only in contact with the left part of the outer surface of the cylinder body 1 and has not formed support). Then the lifting device pushes the hinge part 3 upward through the supporting device, so that the upper end surface of the hinge part 3 completely coincides with the lower end surface of the positioning plate 15, so as to achieve the purpose of adjusting the level of the upper end surface of the hinge part 3; second, the hinge part 3 is slightly counterclockwise based on the horizontal state, such as Fig.13 As shown, the hinge part 3 first contacts the driving inclined surface 18 of the positioning plate 15 and forces the positioning plate 15 to lift up. The positioning plate 15 reacts the hinge part 3 through the force of the torsion spring 16, so that the hinge part 3 rotates counterclockwise. The counterclockwise rotation here is slight. The side of the hinge part 3 that contacts the positioning plate 15 enters under the hinge part 3. When the cylinder body 1 is in the left and right direction, the hinge part 3 is completely located under the positioning plate 15. At this time, since the right end of the cylinder body 1 is fixed by the chuck 11, the left end of the cylinder body 1 is slightly drooping. Then the jacking device pushes the hinge part 3 upward through the supporting device, so that the upper end surface of the hinge part 3 is completely overlapped with the lower end surface of the positioning plate 15, so as to achieve the purpose of adjusting the level of the upper end surface of the hinge part 3.

[0044] In this embodiment, the jacking device includes a first hydraulic telescopic rod 19, and an arc-shaped slider 20 is fixedly provided at the bottom end of the first hydraulic telescopic rod 19. An arc-shaped track 21 is fixedly provided on the upper end surface of the workbench 7. The center of the arc-shaped track 21 is located on the rotating axis of the mounting seat 10. The arc-shaped slider 20 and the arc-shaped track 21 are slidably arranged. A V-shaped block 22 is fixedly provided at the output end of the first hydraulic telescopic rod 19. When in use, the first hydraulic telescopic rod 19 pushes the V-shaped block 22 upward so that the V-shaped block 22 contacts the outer surface of the cylinder body 1, thereby achieving the purpose of the V-shaped block 22 supporting the cylinder body 1.

[0045] In this embodiment, a plurality of spherical chambers are evenly opened on the lower end surface of the arc-shaped slider 20, and a ball 23 is arranged in each spherical chamber, and the ball 23 can rotate freely in the spherical chamber; when the arc-shaped slider 20 moves in the arc-shaped track 21, the ball 23 on the lower end surface of the arc-shaped slider 20 rotates in the track, making it easier to move the arc-shaped slider 20.

[0046] In this embodiment, the adjusting device includes a first threaded rod 24 arranged in the vertical slider 14 along the up and down directions. The first threaded rod 24 is threadedly connected to the vertical slider 14. The first threaded rod 24 is rotatably connected to the vertical plate 12 through the top plate 25. A scale needle 26 is fixedly provided on the left side surface of the vertical slider 14, and a scale line is provided on the left side surface of the vertical plate 12. By rotating the first threaded rod 24 to drive the vertical slider 14 to move up and down, the purpose of adjusting the height of the limit plate 13 and the positioning plate 15 is achieved, so as to achieve the purpose of processing according to different specifications of hydraulic cylinders.

[0047] In order to achieve the purpose of automatically starting and stopping the first hydraulic telescopic rod 19 in cooperation with the outer end of the positioning plate 15 to rotate upward, in this embodiment, the lower end surface of the limit plate 13 is provided with a start normally open contact 27 and a stop normally closed contact 28. The start normally open contact 27 is located at the rear side of the stop normally closed contact 28. The start normally open contact 27 and the stop normally closed contact 28 are auxiliary contacts of the start control contactor of the first hydraulic telescopic rod 19, which are used to control the start and stop of the first hydraulic telescopic rod 19. When in use, when the outer end of the positioning plate 15 rotates upward, the upper end surface of the positioning plate 15 first presses the start normally open contact 27 located on the rear side, so that the start normally open contact 27 is closed, and the first hydraulic telescopic rod 19 is started. 9 starts to push the V-shaped block 22 upward, so that the V-shaped block 22 pushes the left end of the cylinder body 1 to move upward, so that the upper end surface of the hinge part 3 at the left end of the cylinder body 1 completely overlaps with the lower end surface of the positioning plate 15, so that the upper end surface of the hinge part 3 reaches a horizontal state, at this time, the upper end surface of the positioning plate 15 completely overlaps with the lower end surface of the limiting plate 13, and is limited by the lower end surface of the limiting plate 13, so that the positioning plate 15 stops rotating. When the upper end surface of the positioning plate 15 completely overlaps with the lower end surface of the limiting plate 13, the upper end surface of the positioning plate 15 presses the stop normally closed contact 28, so that the stop normally closed contact 28 is disconnected, so that the first hydraulic telescopic rod 19 stops, and the fixed positioning of the cylinder body 1 and the hinge part 3 is completed. The control of the first hydraulic telescopic rod 19 by the serial start normally open contact 27 and the stop normally closed contact 28 belongs to the conventional technology in the field and will not be repeated here.

[0048] In this embodiment, two sliding holes 29 are provided in the lower end surface of the limit plate 13 along the up-down direction. The start normally open contact 27 and the stop normally closed contact 28 respectively include a start contact 30 and a stop contact 31 which are respectively slidably arranged in the up-down direction by the limit plate 13 through the two sliding holes 29. The start contact 30 is located at the rear side of the stop contact 31. A first contact block 32 is fixedly arranged on the upper end surface of the start contact 30. A contact rod 33 is fixedly arranged on the upper end surface of the stop contact 31. Both the first contact block 32 and the contact rod 33 are sleeved with an ejection spring 34. The ejection spring 34 pushes the start contact 30 and the stop contact 31 to move downward all the time, so that the bottom ends of the start contact 30 and the stop contact 31 protrude from the lower end surface of the limit plate 13. A first contact 35 is fixedly arranged in the limit plate 13 above the first contact block 32. The ejection spring 34 drives the start contact 30 It always moves downward, so that the first contact block 32 of the starting contact 30 is separated from the first contact 35. When the bottom end of the starting contact 30 is pressed and moves upward, the first contact block 32 moves upward and contacts the first contact 35, thereby achieving closure and starting the first hydraulic telescopic rod 19. A second contact block 36 is fixedly provided at the top of the touch rod 33, and a second contact 37 is fixedly provided in the limit plate 13 below the second contact block 36. The second contact 37 is nested with the touch rod 33, and the ejection spring 34 drives the stop contact 31 to always move downward, so that the touch rod 33 drives the second contact block 36 to move downward and contact the first contact 35. When the stop contact 31 is pressed and moves upward, the second contact block 36 is driven by the touch rod 33 to move upward, so that the second contact block 36 is separated from the second contact 37, thereby achieving disconnection and stopping the first hydraulic telescopic rod 19.

[0049] In this embodiment, a support plate 38 is fixedly provided on the upper end surface of the workbench 7 in the vertical direction, a fixed plate 39 is fixedly provided on the front side surface of the support plate 38, and a sliding plate 40 is slidably provided on the front side surface of the support plate 38 above the fixed plate 39 in the up and down directions, and two guide rods 41 are provided on the lower end surface of the sliding plate 40, and the bottom ends of the two guide rods 41 pass through the fixed plate 39 and are provided with a clamping device, and a second hydraulic telescopic rod 42 is fixedly provided on the upper end surface of the fixed plate 39, and the output end of the second hydraulic telescopic rod 42 is fixedly provided with the sliding plate 40; when in use, after the cylinder body 1 is fixed, the two joint seats 4 are respectively fixed on the clamping devices of the two guide rods 41, and then the second hydraulic telescopic rod 42 contracts to drive the sliding plate 40 to move downward, so that the sliding plate 40 drives the two guide rods 41 to move downward, so that the two guide rods 41 place the two joint seats 4 on the upper part of the outer surface of the cylinder body 1 through the clamping device, so as to realize the positioning and fixing of the two joint seats 4, and then the robot arm uses a welding gun 68 to weld the joint seat 4 to the cylinder body 1.

[0050] In this embodiment, the clamping device includes a mounting block 43 that is slidably arranged on the guide rod 41 up and down, and a sliding cavity is provided on the lower end surface of the mounting block 43. Two moving blocks 45 are slidably arranged in the sliding cavity of the mounting block 43 along the front-back direction. The two moving blocks 45 are located on both sides of the guide rod 41, and the lower end surfaces of the two moving blocks 45 are fixedly provided with clamping blocks 46. A cone 47 is fixedly provided at the bottom end of the guide rod 41, and a curved surface that matches the cone 47 is provided on a side surface close to the two moving blocks 45. A clamping spring 48 is fixedly provided between the outer side surfaces of the two moving blocks 45 and the inner side wall of the sliding cavity of the mounting block 43; when the mounting block 43 moves upward on the guide rod 41, the moving block 45 and the clamping block 46 are driven to move upward, and when the curved surface of the moving block 45 is upwardly separated from the cone 47 and the outer side of the guide rod 41 When the surfaces are in contact, the two moving blocks 45 are separated by the guide rod 41, so that the clamping blocks 46 move away from each other, and then the joint seat 4 is placed between the two clamping blocks 46 and the upper end surface of the joint seat 4 is in contact with the lower end surface of the cone 47 of the guide rod 41, and then the mounting block 43 is moved downward. When the arc surface of the moving block 45 moves downward to the cone 47, the two clamping blocks 46 and the two moving blocks 45 move downward in a similar manner under the action of the clamping spring 48, and at the same time, the two clamping blocks 46 move downward, so that the two clamping blocks 46 clamp the joint seat 4; then the second hydraulic telescopic rod 42 contracts to drive the joint seat 4 to move downward through the sliding plate 40, the two guide rods 41 and the clamping blocks 46, and the joint seat 4 is placed on the upper part of the outer surface of the cylinder body 1, so as to realize the positioning and fixation of the two joint seats 4.

[0051] In order to achieve the purpose of driving the mounting block 43 to move up and down, in this embodiment, a third hydraulic telescopic rod 49 is fixedly provided on the lower end surface of the sliding plate 40, and a push rod 50 is fixedly provided on the output end of the third hydraulic telescopic rod 49. The push rod 50 passes through the fixed plate 39 downward and is fixedly provided with a connecting plate 51. Both ends of the connecting plate 51 are fixedly provided with the corresponding mounting block 43; when the second hydraulic telescopic rod 42 drives the sliding plate 40 to move up and down, the third hydraulic telescopic rod 49, the push rod 50 and the mounting block 43 follow the movement. When it is necessary to make When the two clamping blocks 46 are separated to facilitate clamping of the joint seat 4, the third hydraulic telescopic rod 49 is contracted to drive the push rod 50 to move upward, so that the push rod 50 drives the two mounting blocks 43 to move upward through the connecting plate 51, and the mounting blocks 43 move upward on the corresponding guide rods 41, so that the two clamping blocks 46 are separated, and then the joint seat 4 is placed between the two clamping blocks 46 and the upper end surface of the joint seat 4 contacts the lower end surface of the conical body 47 of the guide rod 41. At this time, the push rod 50 is pushed downward by the third hydraulic telescopic rod 49. , so that the two mounting blocks 43 move downward on the corresponding guide rods 41, and then the two clamping blocks 46 move close to each other and move downward at the same time, so that the two clamping blocks 46 are located at the front and rear sides of the joint seat 4 and clamp the joint seat 4; then the sliding plate 40 is driven to move downward by the contraction of the second hydraulic telescopic rod 42, so that the two guide rods 41 move downward, and then the two joint seats 4 are driven downward to be placed on the upper part of the outer surface of the cylinder body 1, so as to realize the positioning of the two joint seats 4 on the cylinder body 1; To facilitate welding with the welding gun 68, the third hydraulic telescopic rod 49 contracts to drive the connecting plate 51 to move upward, and then drives the two mounting blocks 43 to move upward until the connecting plate 51 moves upward to a position in contact with the fixed plate 39. At this time, the two joint seats 4 are pressed against the upper part of the outer surface of the cylinder body 1 by the bottom ends of the conical bodies 47 of the two guide rods 41. The positioning of the two joint seats 4 is achieved only by the lower ends of the conical bodies 47 of the two guide rods 41 facing the joint seats 4, which makes it convenient for the robotic arm to use the welding gun 68 to weld the joint seat 4 to the cylinder body 1.

[0052] When the two joint seats 4 are welded, it is necessary to drill a hole on the joint seat 4 so that the upper cavity or the lower cavity inside the cylinder body 1 of the joint seat 4 is connected, so as to achieve the purpose of connecting the hydraulic oil pipe on the joint seat 4 to transport the hydraulic oil to the inside of the cylinder body 1 or discharge the hydraulic oil inside the cylinder body 1 into the hydraulic oil pipe through the joint seat 4. In order to achieve the purpose of drilling a hole in the joint seat 4, in this embodiment, a fourth hydraulic telescopic rod 69 is fixedly provided on the front side of the support plate 38, and a slide plate 70 is fixedly provided on the output end of the fourth hydraulic telescopic rod 69. Two drive motors 71 are fixedly provided on the front side of the slide plate 70. A transmission shaft 52 is vertically provided inside the guide rod 41, and the top end of each transmission shaft 52 is fixedly provided with the output shaft of the corresponding drive motor 71. A mounting sleeve 53 is fixedly provided on the bottom end of the transmission shaft 52, and a drill bit 54 is installed on the lower end surface of the mounting sleeve 53. The drill bit 54 and the mounting sleeve 53 are both positioned In the vertical cavity coaxially opened inside the guide rod 41, a blocking block 56 is coaxially fixedly arranged in the vertical cavity of the guide rod 41, the drill bit 54 is sleeved with the blocking block 56, and the outer surface of the cone 47 is evenly provided with a plurality of inclined holes 57 connected with the vertical cavity along the circumference; when the two guide rods 41 press the two joint seats 4 on the upper part of the outer surface of the cylinder body 1 through the cone 47, the drive motor 71 drives the transmission shaft 52 to rotate respectively, and at the same time the fourth hydraulic telescopic rod 69 pushes the slide plate 70 to move downward, so that the slide plate 70 drives the two drive motors 71 and the transmission shaft 52 to move downward, and then the two drill bits 54 move downward, and the drill bit 54 rotates at the same time during the downward movement, so that the drill bit 54 drills the upper end surface of the joint seat 4, and the iron filings generated when the drill bit 54 drills are discharged from the inclined holes 57 of the cone 47 until the drill bit 54 breaks through the inner cavity of the cylinder body 1, and the blocking block 56 has a blocking effect on the iron filings.

[0053] The spacings of the joint seats 4 of hydraulic cylinders of different specifications are different. In order to achieve the purpose of adjusting the spacing of the two guide rods 41, in this embodiment, telescopic holes are opened at the left ends of the sliding plate 40, the fixed plate 39 and the connecting plate 51, and the sliding plate 40, the fixed plate 39 and the connecting plate 51 are all provided with telescopic plates 58 that slide left and right through the telescopic holes. The left ends of the two upper telescopic plates 58 are fixed with movable plates 59, and the left end of the lowest telescopic plate 58 is fixedly set with the mounting block 43 on the left. The guide rods 41 on the left side all penetrate the two movable plates 59 and the mounting block 43 on the left; the two movable plates 59 and the mounting block 43 on the left are connected together by the side plate 60, and the mounting block 43 on the left side is set to slide up and down with the side plate 60, and the front side of the side plate 60 is fixed The block 64 is threadedly connected with a second threaded rod 61, the right end of the second threaded rod 61 is rotatably connected to the fixed plate 39 through the end block 62, the left end of the second threaded rod 61 passes through a support rod 63 fixedly set on the support plate 38, and the second threaded rod 61 is rotatably connected to the support rod 63; the fixed block 64 is driven to move forward and backward by rotating the second threaded rod 61, so as to achieve the purpose of driving the side plate 60 to move forward and backward, and then achieve the purpose of the side plate 60 driving the two movable plates 59 and the left mounting block 43 to move left and right, and then achieve the purpose of driving the left guide rod 41 to move left and right. When replacing the processing and welding of hydraulic cylinders of different specifications, the left guide rod 41 can be adjusted to move left and right as needed to adapt to the welding of the joint seat 4 of hydraulic cylinders of different specifications.

[0054] In this embodiment, a first gear 65 is fixedly provided on the upper end surface of the base 8, and the lower end surface of the mounting seat 10 is rotatably connected to the first gear 65. The driving device includes a servo motor 66 fixedly provided on the mounting seat 10, and a second gear 67 is fixedly provided on the output shaft of the servo motor 66, and the second gear 67 is meshed with the first gear 65; the servo motor 66 drives the second gear 67 to rotate, so that the second gear 67 moves in a circle around the first gear 65, thereby causing the mounting seat 10 to rotate, thereby achieving the purpose of the servo motor 66 driving the mounting seat 10 to rotate.

[0055] The working principle of the present invention is as follows: the joint seat 4 for the hydraulic oil to enter and exit needs to be welded on the cylinder body 1 of the hydraulic cylinder. First, the cylinder body 1 needs to be fixed, and the mounting seat 10 is driven to rotate by the servo motor 66 so that the chuck 11 faces the front side, and then the arc-shaped slider 20 is slid to the front side of the chuck 11, and then the cylinder body 1 is lifted and carried to the chuck 11 by the sling, so that the right end of the cylinder body 1 is fixed by the chuck 11, and at the same time, the first hydraulic telescopic rod 19 is manually operated to push the V-shaped block 22 upward to move upward, so that the V-shaped block 22 contacts the outer surface of the cylinder body 1, and when the cylinder body 1 is not subjected to the top force of the V-shaped block 22, the first hydraulic telescopic rod 19 stops, and then the servo motor 6 6 drives the mounting seat 10 to rotate, so that the mounting seat 10 drives the cylinder body 1 to rotate to a state of being placed left and right, so that the axis of the cylinder body 1 is parallel to the X-axis. In this process, the hinged part 3 at the left end of the cylinder body 1 first contacts the driving inclined surface 18 of the positioning plate 15, and the hinged part 3 drives the outer end of the positioning plate 15 to lift up. At the same time, the positioning plate 15 presses the hinged part 3 downward through the outer end under the action of the torsion spring 16, so that the hinged part 3 rotates counterclockwise. When the hinged part 3 is located below the positioning plate 15, the upper end surface of the positioning plate 15 first contacts the starting contact 30, so that the starting contact 30 slides upward, so that the first hydraulic telescopic rod 19 is started, and the first hydraulic telescopic rod 19 is started through the V-shaped The clamping block 22 pushes the left end of the cylinder body 1 upward, so that the upper end surface of the hinge part 3 is completely flush with the lower end surface of the positioning plate 15. At this time, the positioning plate 15 is rotated upward and is also limited by the limiting plate 13, so that the upper end surface of the positioning plate 15 is completely overlapped with the lower end surface of the limiting plate 13, so that the lower end surface of the positioning plate 15 is in a horizontal state, and then the upper end surface of the hinge part 3 is in a horizontal state, completing the fixing and positioning of the cylinder body 1; then the transmission shaft 52 drives the two clamping blocks 46 to move similarly and the two clamping blocks 46 move downward at the same time, so that the two clamping blocks 46 are located at the front and rear sides of the joint seat 4 and clamp the joint seat 4; then the second hydraulic telescopic rod 42 is contracted to drive the sliding The plate 40 moves downward, causing the two guide rods 41 to move downward, thereby driving the two joint seats 4 to be placed downward on the upper part of the outer surface of the cylinder body 1, thereby realizing the positioning of the two joint seats 4 on the cylinder body 1; at this time, the transmission shaft 52 contracts and drives the connecting plate 51 to move upward, thereby driving the two mounting blocks 43 to move upward, until the connecting plate 51 moves upward to a position in contact with the fixed plate 39, at which time the two joint seats 4 are pressed against the upper part of the outer surface of the cylinder body 1 by the bottom ends of the conical bodies 47 of the two guide rods 41, and the positioning of the two joint seats 4 is realized only by the lower ends of the conical bodies 47 of the two guide rods 41 facing the joint seats 4 to press them, so that it is convenient for the robot arm to use the welding gun 68 to weld the joint seats 4 and the cylinder body 1 together;The driving motors 71 drive the transmission shafts 52 to rotate respectively, and at the same time, the fourth hydraulic telescopic rod 69 pushes the slide plate 70 to move downward, so that the slide plate 70 drives the two driving motors 71 and the transmission shaft 52 to move downward, and then the two drill bits 54 move downward. The drill bits 54 rotate at the same time during the downward movement, so that the drill bits 54 punch holes on the upper end surface of the joint seat 4, and the iron filings generated when the drill bits 54 punch holes are discharged from the inclined holes 57 of the cone 47 until the drill bits 54 punch through the inner cavity of the cylinder body 1. ;

Claims

1. A positioning and fixing device for hydraulic cylinder welding, characterized in that: The invention comprises a workbench (7), wherein a base (8) is fixedly arranged on the right part of the upper surface of the workbench (7), a tailstock (9) is slidably arranged on the left part of the upper surface of the workbench (7), the upper surface of the base (8) is rotatably connected to a mounting seat (10), a driving device is arranged on the mounting seat (10), the driving device is used to drive the mounting seat (10) to rotate, a chuck (11) is rotatably connected inside the mounting seat (10), the chuck (11) is used to clamp and fix the right end of the cylinder body (1), the upper end surface of the workbench (7) is provided with a limit leveling device on the upper end surface of the hinge part (3), and the upper end surface of the workbench (7) is along the upper end surface of the workbench (7). A circumferential sliding device is provided on a virtual circle formed by the rotation axis of the mounting seat (10) as an axis, and an output end of the jacking device is connected to a supporting device, and the supporting device is used to support the left part of the cylinder body (1); a positioning device of a joint seat (4) is provided on the workbench (7), and the positioning device of the joint seat (4) is used to position the positions of the two joint seats (4), so that the two joint seats (4) are respectively located at the two ends of the outer surface of the cylinder body (1), and the center line of the two joint seats (4) is horizontal with the axis of the cylinder body (1), and the vertical side surfaces of the two joint seats (4) are perpendicular to the upper end surface of the hinged part (3); The limit and leveling device on the upper end surface of the hinged portion (3) comprises a vertical plate (12) fixedly arranged on the upper end surface of the workbench (7); a limit plate (13) is slidably arranged on the front side surface of the vertical plate (12) so as to be horizontal; the lower end surface of the limit plate (13) is a plane in a horizontal state; an adjustment device is arranged on the vertical plate (12), and the adjustment device is used to drive the limit plate (13) to move up and down, and the adjustment device can realize locking of the limit plate (13) at any position; A vertical slider (14) is fixedly arranged on the outer surface of the limiting plate (13), and the vertical slider (14) and the vertical plate (12) are slidably arranged in the up-down direction. A positioning plate (15) is hingedly connected to the front side surface of the vertical slider (14) below the limiting plate (13). When the outer end of the positioning plate (15) rotates upward, the upper end surface of the positioning plate (15) can completely overlap with the lower end surface of the limiting plate (13), and then the positioning plate (15) is limited by the lower end surface of the limiting plate (13) and stops rotating. The lower end surface of the positioning plate (15) is a horizontal plane, a torsion spring (16) is provided at a position where the positioning plate (15) and the vertical slider (14) are hinged, the torsion spring (16) drives the outer end of the positioning plate (15) to rotate downward all the time, a limit block (17) is provided on the vertical slider (14) below the positioning plate (15), the limit block (17) limits the downward rotation distance of the outer end of the positioning plate (15); the front end of the positioning plate (15) is provided with a driving inclined surface (18).

2. The positioning and fixing device for hydraulic cylinder welding according to claim 1 is characterized in that: The adjusting device comprises a first threaded rod (24) arranged in the vertical slider (14) along the up-down direction, the first threaded rod (24) being threadedly connected to the vertical slider (14), the first threaded rod (24) being rotatably connected to the vertical plate (12) via a top plate (25), a scale needle (26) being fixedly arranged on the left side surface of the vertical slider (14), and a scale line being arranged on the left side surface of the vertical plate (12).

3. The positioning and fixing device for hydraulic cylinder welding according to claim 2 is characterized in that: The lifting device comprises a first hydraulic telescopic rod (19), and a start normally open contact (27) and a stop normally closed contact (28) are arranged on the lower end surface of the limit plate (13), the start normally open contact (27) is located at the rear side of the stop normally closed contact (28), and the start normally open contact (27) and the stop normally closed contact (28) are auxiliary contacts of the start control contactor of the first hydraulic telescopic rod (19), and are used to control the start and stop of the first hydraulic telescopic rod (19).

4. The positioning and fixing device for hydraulic cylinder welding according to claim 3 is characterized in that: A support plate (38) is fixedly arranged on the upper end surface of the workbench (7) in the vertical direction, a fixed plate (39) is fixedly arranged on the front side surface of the support plate (38), a sliding plate (40) is slidably arranged on the front side surface of the support plate (38) above the fixed plate (39) in the up-down direction, two guide rods (41) are arranged on the lower end surface of the sliding plate (40), the bottom ends of the two guide rods (41) pass through the fixed plate (39) and are provided with a clamping device, a second hydraulic telescopic rod (42) is fixedly arranged on the upper end surface of the fixed plate (39), and the output end of the second hydraulic telescopic rod (42) is fixedly arranged on the sliding plate (40).

5. The positioning and fixing device for hydraulic cylinder welding according to claim 4 is characterized in that: The clamping device comprises a mounting block (43) slidably arranged on the guide rod (41) up and down, a sliding cavity being provided on the lower end surface of the mounting block (43), two moving blocks (45) being slidably arranged in the sliding cavity of the mounting block (43) along the front-rear direction, the two moving blocks (45) being located on both sides of the guide rod (41), a clamping block (46) being fixedly arranged on the lower end surfaces of the two moving blocks (45), a cone (47) being fixedly arranged on the bottom end of the guide rod (41), an arc surface matching the cone (47) being provided on the side surfaces adjacent to the two moving blocks (45), and a clamping spring (48) being fixedly arranged between the outer side surfaces of the two moving blocks (45) and the inner side wall of the sliding cavity (44) of the mounting block (43).

6. The positioning and fixing device for hydraulic cylinder welding according to claim 5, characterized in that: A third hydraulic telescopic rod (49) is fixedly disposed on the lower end surface of the sliding plate (40), a push rod (50) is fixedly disposed on the output end of the third hydraulic telescopic rod (49), the push rod (50) passes through the fixed plate (39) downward and is fixedly disposed with a connecting plate (51), and both ends of the connecting plate (51) are fixedly disposed with corresponding mounting blocks (43).

7. The positioning and fixing device for hydraulic cylinder welding according to claim 6, characterized in that: A fourth hydraulic telescopic rod (69) is fixedly arranged on the front side of the support plate (38), a slide plate (70) is fixedly arranged on the output end of the fourth hydraulic telescopic rod (69), two drive motors (71) are fixedly arranged on the front side of the slide plate (70), a transmission shaft (52) is arranged inside the guide rod (41) along the vertical direction, the top end of each transmission shaft (52) is fixedly arranged with the output shaft of the corresponding drive motor (71), a mounting sleeve (53) is fixedly arranged at the bottom end of the transmission shaft (52), a drill bit (54) is installed on the lower end surface of the mounting sleeve (53), the drill bit (54) and the mounting sleeve (53) are both located in a vertical cavity coaxially opened inside the guide rod (41), a blocking block (56) is coaxially fixedly arranged in the vertical cavity of the guide rod (41), the drill bit (54) and the blocking block (56) are sleeved, and a plurality of inclined holes (57) connected to the vertical cavity are evenly opened along the circumference of the outer surface of the cone (47).

8. The positioning and fixing device for hydraulic cylinder welding according to claim 7, characterized in that: The sliding plate (40), the fixed plate (39) and the connecting plate (51) are all provided with telescopic holes at their left ends. The sliding plate (40), the fixed plate (39) and the connecting plate (51) are all provided with telescopic plates (58) that can slide left and right through the telescopic holes. The left ends of the two upper telescopic plates (58) are both fixedly provided with movable plates (59). The left end of the lowermost telescopic plate (58) is fixedly provided with the mounting block (43) on the left side. The guide rod (41) on the left side passes through the two movable plates (59) and the mounting block (43) on the left side. The two movable plates (59) and the mounting block (43) on the left side are fixedly provided with the movable plates (59). The plate (59) and the left mounting block (43) are connected together through the side plate (60); the left mounting block (43) and the side plate (60) are slidably arranged up and down; the front side surface of the side plate (60) is threadedly connected with a second threaded rod (61) through a fixing block (64); the right end of the second threaded rod (61) is rotatably connected to the fixing plate (39) through an end block (62); the left end of the second threaded rod (61) passes through a support rod (63) fixedly arranged on the support plate (38), and the second threaded rod (61) is rotatably connected to the support rod (63).

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