Hydraulic cylinder welding device and welding method

Abstract

The present invention discloses a hydraulic cylinder welding device and a welding method, and relates to the technical field of welding devices. The hydraulic cylinder welding device and the welding method include: a box body, wherein a grinding part and a brazing part are arranged in the box body, the grinding part is used to pre-press the connection part between the cylinder body and the top cover, and the brazing part is used to weld the connection part between the cylinder body and the top cover; a positioning part is used to guide the moving direction of the top cover and connect the top cover with the cylinder body; a placing part is used to fix the cylinder body and is placed on the positioning part by rotation; a fixing part is used to fix the placing part perpendicular to the bottom plate. The hydraulic cylinder welding device and the welding method are connected by rotation between the placing part and the fixing part, the placing part is used to place the cylinder body and the top cover, the placing part and the fixing part can be fixed as a whole by the clamping rod and combined into a fixed seat, the grinding part is used to pre-press the connection part between the cylinder body and the top cover, and the brazing part is used to braze the connection part between the cylinder body and the top cover after pre-pressing.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a hydraulic cylinder welding device and a welding method. Background Art

[0002] The brazing process of the hydraulic cylinder barrel and the top cover is a key process step, and the quality and sealing of the brazing need to be ensured.

[0003] In the known prior art, the cylinder is vertically fixed on the bottom plate, the top cover is covered on the top of the cylinder and fixed by a fixing piece, and the connection between the cylinder and the top cover is welded along the circumferential direction by a brazing head. After the processing is completed, the cylinder is removed from the bottom plate.

[0004] However, the cylinder and the top cover are only simply fixed, and there is a certain fitting gap between the cylinder and the top cover. After welding, the preload force of the connection between the cylinder and the top cover is small. For hydraulic cylinders with higher pressure, thicker cylinder wall and larger cylinder diameter, problems such as stress concentration and cracks caused by the gap are prone to occur after welding, and the bottom plate cannot be rotated, which is not convenient for taking and placing the cylinder. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a hydraulic cylinder welding device and a welding method, wherein a placing piece is rotatably connected to a fixing piece, the placing piece is used to place a cylinder body and a top cover, the placing piece and the fixing piece can be fixed as a whole through the clamping rod and combined into a fixed seat, the connection between the cylinder body and the top cover is pre-pressed by a grinding piece, and the pre-pressed connection between the cylinder body and the top cover is brazed by a brazing piece.

[0006] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solutions: A hydraulic cylinder welding device, comprising: a box body, a channel is opened through one side of the box body, a stepper motor is connected to the other side of the box body, the bottom of the box body is connected to a bottom plate, the top of the bottom plate is connected to an oblique support and a fixed block, the side of the fixed block away from the box body is connected to the side of the oblique support close to the box body, the stepper motor is connected to a nut through a screw rod, a grinding part and a brazing part are arranged in the box body, the top of the grinding part is slidably connected to the top wall of the box body, the grinding part is used to pre-press the connection between the cylinder body and the top cover, the brazing part is connected to the side wall of the box body, the brazing part is used to weld the connection between the cylinder body and the top cover, and the top cover is composed of a top plate and a cylinder at the bottom of the top plate.

[0007] The positioning member is used to guide the moving direction of the top cover and connect the top cover with the cylinder body, and the bottom of the positioning member is connected with the top of the inclined plate.

[0008] The placing piece is used to fix the cylinder and is placed on the positioning piece by rotating, and the placing piece is arranged above the bottom plate.

[0009] The fixing piece is used to fix the placement piece perpendicular to the bottom plate, and the bottom of the fixing piece is placed on the fixing block.

[0010] When the longitudinal axis of the placing piece is perpendicular to the bottom plate, the placing piece and the fixing piece are fixed by the clamping rod and combined into a fixing seat, a wire drum is connected to the middle part of the fixing piece close to one side of the box body, a nut is connected to the inner wall of the wire drum, the nut is threadedly connected to the screw rod, and the fixing seat moves in and out of the box body along the longitudinal axis of the screw rod under the drive of the wire drum, and a third hydraulic cylinder is connected to the side surface of the top of the diagonal support through the second supporting plate, a pressure head is connected to the telescopic end of the third hydraulic cylinder, and the axis of the pressure head is in the same straight line as the axis of the virtual circle where the top of the second arc plate is located.

[0011] Preferably, the grinding component includes: a second motor, there are two second motors in total, the top of each second motor is slidably connected to the top wall of the box body, the rotating part of each second motor is connected to the grinding plate through a pressure plate, the middle part of the side of each second motor is connected to the first hydraulic cylinder, the two second motors approach each other under the action of the first hydraulic cylinder, the top of the box body is connected to a water tank, one side of the water tank is connected to a second hydraulic cylinder, the telescopic end of the second hydraulic cylinder is connected to a cover plate through a piston rod, the bottom of the water tank is connected to a plurality of water spray pipes, the bottom of the pressure plate is an arc surface, the bottom of the pressure plate is adapted to the arc surface at the top edge of the top plate, and the grinding plate is adapted to the side of the cylinder.

[0012] Preferably, the brazing component includes: a welding head, one side of which is connected to the side wall of the box, the bottom of the welding head is connected to a solder head, the solder head is connected to solder, and the axis of the solder head, the transverse axis of the screw rod and the mid-perpendicular lines of the two second motors are all located on the same vertical plane.

[0013] Preferably, the positioning member includes: a first arc plate, the first arc plate is connected to the top of the diagonal brace through a first supporting plate, both ends of the first arc plate are connected to the first side plate, the first arc plate is connected to a vertical plate on the side away from the box body, the top of the vertical plate is connected to a placement plate, the placement plate is connected to a second arc plate on the side away from the box body, both ends of the second arc plate are connected to the second side plates, the first arc plate and the second arc plate are both semicircular plates, the first side plate is adapted to the positioning cylinder, the second arc plate is adapted to the top cover, the placement plate is adapted to the cylinder, the top of the second arc plate is located above the top of the placement plate, the inner diameter of the second arc plate is equal to the diameter of the top cover, the inner diameter of the placement plate is equal to the diameter of the cylinder, and the inner diameter of the first arc plate is equal to the inner diameter of the positioning cylinder.

[0014] Preferably, the placement member includes: a base, which is arranged above the bottom plate, with rotating shafts connected to two sides of the base, a second hole is opened through the side of the rotating shaft, and convex plates are connected to the other two sides of the base, and a connecting plate is connected to one side of each of the convex plates, and a positioning cylinder is connected to the top of the connecting plate, a groove is opened on the top of the base, and a first motor is connected to the bottom of the groove, and a circular plate is connected to the rotating part of the first motor, and a rod body is connected to the top of the circular plate, and the rod body is sleeved with the cylinder body, and a plurality of friction grooves are opened through the top of the circular plate, and the plurality of friction grooves are equidistantly distributed in the circumferential direction of the circular plate.

[0015] The lockhole that is formed on the two ends of the support frame is formed on the upper and lower surfaces of the support frame, and the lockhole that is formed on the two ends of the support frame is formed on the upper and lower surfaces of the support frame.

[0016] Preferably, a positioning plate is connected to the top of the fixed block, a first hole is opened through the middle of the positioning plate, one end of the screw rod passes through the wire tube and through the first hole, and when the plate body abuts against the positioning plate, the placement piece rotates from a vertical state to an inclined state, and the placement piece matches the positioning piece.

[0017] Preferably, a hydraulic cylinder welding method comprises a hydraulic cylinder welding device, the station where the positioning piece is located is the first station, the station where the grinding piece is located is the second station, and the station where the brazing piece is located is the third station. First, the placing piece and the fixing piece are driven by the wire reel to enter and exit the box along the longitudinal axis direction of the screw rod, and the bottom of the fixing piece stops moving after contacting the positioning plate. At this time, the placing piece and the fixing piece are located in the first station, the placing piece rotates, the placing piece is placed in the positioning piece, the cylinder body and the rod body are plugged in, the cylinder body is placed on the placing plate, and the top cover placed on the second arc plate enters the cylinder body under the extrusion of the pressure head, completing the pre-connection between the top cover and the cylinder body, and the placing piece and the fixing piece are fixed by the clamping rod and combined into a fixed seat, and the fixed seat enters and exits the box through the channel under the drive of the wire reel. Then, when the fixed seat moves to the second station, the connection between the cylinder body and the top cover is pre-pressed and polished by the grinding piece. Finally, the fixed seat moves to the third station, and the connection between the cylinder body and the top cover after pre-pressing is brazed by the brazing piece.

[0018] Beneficial effects: The present invention provides a hydraulic cylinder welding device and a welding method. Compared with the prior art, the present invention has the following beneficial effects: 1. Through the rotational connection between the placing piece and the fixing piece, when the placing piece is placed vertically, the clamping holes of the placing piece and the fixing piece are aligned, the placing piece and the fixing piece are connected as a whole and form a fixing seat, which is convenient for overall movement. When the placing piece is tilted, the placing piece is placed upside down in the positioning piece, and the cylinder and the top cover are supported and positioned, so that the top cover and the cylinder are accurately connected together and the pre-connection is completed.

[0019] 2. The connection between the top cover and the cylinder is pre-pressed by the pressing and grinding device, so that the cylinder at the bottom of the top cover is more tightly connected to the inner wall of the cylinder, reducing the fitting gap between the cylinder and the top cover, so that a certain pre-tightening force is formed between the cylinder and the top cover, providing additional sealing effect when the hydraulic cylinder is working, and enhancing the sealing performance of the hydraulic cylinder. After pre-pressing, the connection between the cylinder cover and the cylinder barrel is tighter, so that the welding temperature and speed can be better controlled during the welding process, avoiding defects such as deformation or cracks during welding, thereby ensuring the welding quality.

[0020] 3. The bottom of the pressing plate is an arc surface, and the bottom of the pressing plate is matched with the arc surface at the top edge of the cover plate. The bottom of the pressing plate squeezes the top of the cover plate, the grinding plate squeezes the cylinder, and the cover plate presses down the top cover. The cover plate can also protect other parts to avoid deformation or damage during processing, and can also squeeze the edge of the connecting part of the top cover. The pressing plate moves along the circumference of the cover plate, so that the edge of the cover plate is concave and slightly moved downward, and the grinding plate lightly presses the edge of the top of the cylinder, so that the cylindrical connection between the cylinder and the top cover is tighter, reducing the fitting gap between the cylinder and the top cover, and forming a certain pre-tightening force between the cylinder and the top cover, thereby completing the pre-compression of the cylinder and the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and enable those skilled in the relevant art to make and use the present application.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 for Figure 1Front cross-sectional view of .

[0025] Figure 3 for Figure 1 Separation diagram of the part where the box body is located and the part where the diagonal brace is located.

[0026] Figure 4 This is a schematic diagram of the structure where the diagonal brace is located.

[0027] Figure 5 It is a schematic diagram of the structure of positioning parts, placing parts and fixing parts.

[0028] Figure 6 for Figure 5 Separation diagram of the positioning parts and placement parts.

[0029] Figure 7 It is a schematic diagram of the structure of the positioning part.

[0030] Figure 8 It is a schematic diagram of the structure where the placement plate and the second arc plate are located.

[0031] Fig. 9 This is a separation diagram of the placement parts, fixing parts and their connecting structure.

[0032] Fig.10 This is a separate diagram of the placement parts and the fixing parts.

[0033] Fig.11 This is an exploded view of the placed part.

[0034] Fig.12 A schematic diagram of the structure of the fixing parts.

[0035] Fig.13 It is a schematic diagram of the structure of the placement piece being fixed to the vertical state by the clamping rod and the fixing piece.

[0036] Fig.14 It is a schematic diagram of the structure of the grinding element and the plate body.

[0037] Fig.15 It is a schematic diagram of the structure of the grinding part.

[0038] Fig.16 It is a schematic diagram of the structure of the connection between the top cover, the top cover, the pressure plate and the grinding plate.

[0039] Fig.17 It is a structural schematic diagram of the brazing parts and the plate body.

[0040] Fig.18 It is a schematic diagram of the structure of the welding head, solder head and top cover.

[0041] The reference numerals in the figure are: 11 bottom plate, 12 box body, 13 channel, 14 diagonal support, 15 first support plate, 16 second support plate, 17 fixed block, 18 positioning plate, 19 first channel, 2 positioning member, 21 first arc plate, 22 first side plate, 23 vertical plate, 24 placement plate, 25 second arc plate, 26 second side plate, 3 placement member, 31 base, 32 rotating shaft, 33 second channel, 34 convex plate, 35 connecting plate, 36 positioning cylinder, 37 first motor, 38 round plate, 39 rod body, 4 fixed Parts, 41 plate body, 42 third channel, 43 third support, 44 shaft head, 45 top hole, 46 bottom hole, 47 insert tube, 51 cylinder body, 52 top cover, 53 wire tube, 54 nut, 55 stepping motor, 56 screw rod, 57 clamping rod, 58 friction groove, 6 grinding part, 61 second motor, 62 pressure plate, 63 grinding plate, 64 first hydraulic cylinder, 65 second hydraulic cylinder, 66 piston rod, 67 cover plate, 68 water spray pipe, 7 brazing part, 71 welding head, 72 brazing head, 81 third hydraulic cylinder, 82 pressure head.

[0042] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The technical solution in the embodiment of the present application is to solve the above-mentioned technical problems. The overall idea is as follows: the workstation where the positioning piece is located is the first workstation, the workstation where the grinding piece is located is the second workstation, and the workstation where the brazing piece is located is the third workstation. The placement piece is rotatably connected to the fixing piece, and the placement piece is used to place the cylinder and the top cover. The placement piece and the fixing piece can be fixed as a whole through the clamping rod and combined into a fixing seat (not shown). The fixing seat moves in and out of the box body under the drive of the wire reel. First, the fixing seat moves to the first workstation, removes the clamping rod, and the placement piece rotates from a vertical state to an inclined state and is placed in the positioning piece. The cylinder and the top cover are adjusted by multiple arc plates of the positioning piece. The cover is guided so that the cylinder is installed on the placement piece, and the top cover is snapped and adapted to the cylinder to prevent the connection between the top cover and the cylinder from offset. After the top cover and the cylinder are pre-installed, the placement piece is rotated to a vertical state and fixed with the fixing piece, the fixing seat enters the box, and the fixing seat moves to the second station, and the connection between the cylinder and the top cover is pre-pressed and polished by the grinding piece to eliminate the matching clearance between the cylinder and the top cover as much as possible, so that a certain pre-tightening force is formed between the cylinder and the top cover, thereby forming a tighter joint after welding, and then the fixing seat moves to the third station, and the pre-pressed connection between the cylinder and the top cover is brazed by the brazing piece.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Example 1

[0046] Reference Figure 1 - Fig.12 A hydraulic cylinder welding device includes: a positioning member 2, which is used to guide the moving direction of a top cover 52 and connect the top cover 52 to a cylinder 51, the bottom of the positioning member 2 is connected to the top of an inclined plate, and the positioning member 2 includes: a first arc plate 21, the first arc plate 21 is connected to the top of an inclined support 14 through a first support plate 15, both ends of the first arc plate 21 are connected to a first side plate 22, a side of the first arc plate 21 away from a box body 12 is connected to a vertical plate 23, a top of the vertical plate 23 is connected to a placement plate 24, a side of the placement plate 24 away from the box body 12 is connected to a second arc plate 25, both ends of the second arc plate 25 are connected to a second side plate 26, the first arc plate 21 and the second arc plate 25 are all semicircular plates, the first side plate 22 is adapted to the positioning cylinder 36, the second arc plate 25 is adapted to the top cover 52, the placement plate 24 is adapted to the cylinder 51, the top of the second arc plate 25 is located above the top of the placement plate 24, the inner diameter of the second arc plate 25 is equal to the diameter of the top cover 52, the inner diameter of the placement plate 24 is equal to the diameter of the cylinder 51, the inner diameter of the first arc plate 21 is equal to the inner diameter of the positioning cylinder 36, the side surface of the top of the diagonal support 14 is connected to the third hydraulic cylinder 81 through the second support plate 16, the telescopic end of the third hydraulic cylinder 81 is connected to the pressure head 82, and the axis of the pressure head 82 is in the same straight line as the axis of the virtual circle where the top of the second arc plate 25 is located.

[0047] The placing member 3 is used to fix the cylinder 51 and place it on the positioning member 2 by rotating. The placing member 3 is arranged above the bottom plate 11. The placing member 3 includes: a base 31, which is arranged above the bottom plate 11. The two sides of the base 31 are connected with a rotating shaft 32, and the side of the rotating shaft 32 is penetrated with a second channel 33. The other two sides of the base 31 are connected with a convex plate 34, and one side of each convex plate 34 is connected with a connecting plate 35. The top of the connecting plate 35 is connected with a positioning cylinder 36. A groove is opened at the top of the base 31, and a first motor 37 is connected to the bottom of the groove. The rotating part of the first motor 37 is connected to a circular plate 38. The top of the circular plate 38 is connected with a rod body 39, and the rod body 39 is sleeved with the cylinder 51. A plurality of friction grooves 58 are penetrated through the top of the circular plate 38, and the plurality of friction grooves 58 are equidistantly distributed in the circumferential direction of the circular plate 38.

[0048] The fixing member 4 is used to fix the placement member 3 perpendicular to the bottom plate 11. The bottom of the fixing member 4 is placed on the fixing block 17. The fixing member 4 includes: a plate body 41. The bottom of the plate body 41 is slidably connected to the top of the fixing block 17. A third channel 42 is penetrated through one side of the plate body 41 close to the box body 12. The tops of both ends of the plate body 41 are connected to shaft heads 44 through third support plates 43. A top hole 45 is penetrated through the top of the side of the shaft head 44. A bottom hole 46 is penetrated through the bottom of the side of the shaft head 44. Two insert tubes 47 are arranged between the two third support plates 43. The two insert tubes 47 are symmetrically distributed along the longitudinal axis of the plate body 41. The bottom of each insert tube 47 is inserted into the plate body 41. Each insert tube 47 is located at a bottom hole 46. Directly below, a clamping rod 57 is arranged above the shaft head 44. When the longitudinal axis of the placement piece 3 is perpendicular to the bottom plate 11, one end of the clamping rod 57 passes through the second channel 33, the top hole 45, and the bottom hole 46 in sequence and is inserted into the insert tube 47 to connect the fixing piece 4 and the placement piece 3 as one. The projection area of ​​the top hole 45 is larger than the projection area of ​​the bottom hole 46. A wire tube 53 is connected to the middle part of the plate body 41 close to the box body 12. A positioning plate 18 is connected to the top of the fixing block 17. A first channel 19 is opened through the middle part of the positioning plate 18. One end of the screw rod 56 passes through the wire tube 53 and the first channel 19. When the plate body 41 abuts against the positioning plate 18, the placement piece 3 rotates from a vertical state to an inclined state, and the placement piece 3 matches the positioning piece 2.

[0049] In this example, see Figure 1 - Fig.12When in use, the stepper motor 55 drives the screw rod 56, the nut 54, and the wire drum 53 in turn, so that the wire drum 53 moves along the axis direction of the screw rod 56 toward the direction close to the positioning plate 18. At this time, the fixing member 4 and the placement member 3 are fixed together by the clamp rod 57 and combined into a fixed seat. The wire drum 53 is connected to the fixing seat, and the fixing seat is close to the positioning plate 18. Finally, the plate body 41 contacts and squeezes the positioning plate 18, and the stepper motor 55 stops rotating. At this time, the fixing seat moves to the first station. The positioning plate 18 is used to position the movement of the fixing seat, so that the positioning member 2 stays accurately at the first station. Pull out the clamp rod 57, the fixing member 4 is connected to the placement member 3 in rotation, and the rotating shaft 32 on the placement member 3 rotates around the shaft head 44, and the placement member 3 changes from a vertical state to an inclined state. If the placement piece 3 is in a vertical state, there is a large height difference between the top of the rod body 39 and the top of the bottom plate 11, and the long cylinder 51 needs to be sleeved on the outside of the rod body 39, which is inconvenient to operate and increases the difficulty of the staff's work. Changing the vertical state to an inclined state can not only reduce the height of the rod body 39 from the bottom plate 11, but also facilitate the placement and removal of the cylinder 51, thereby improving work efficiency. Place the placement member 3 in the positioning member 2. At this time, the positioning cylinder 36 is placed on the first arc plate 21. The cylinder body 51 is sleeved on the rod body 39. The cylinder body 51 is placed on the placement plate 24. Then, the top cover 52 is placed on the second arc plate 25. At this time, the top cover 52 is facing the top of the cylinder body 51. The staff can first slide the top cover 52 down along the second arc plate 25 and connect the top cover 52 with the cylinder body 51, and then start the third hydraulic cylinder 81. The telescopic end of the third hydraulic cylinder 81 brings the pressure head 82 to press the top cover 52 into the cylinder body 51, or only the pressure head 82 can be used to press the top cover 52 into the cylinder body 51, thereby completing the pre-connection of the top cover 52 and the cylinder body 51. The diameter of the top cover 52 is larger than the diameter of the pressure head 82 to prevent the top cover 52 from contacting the inner wall of the second arc plate 25. The axis of the pressure head 82, the axis of the virtual circle where the top of the second arc plate 25 is located, and the axis of the third hydraulic cylinder 81 are all located in the same straight line. The third hydraulic cylinder 81 moves along the axis of the pressure head 82 to ensure that the top cover 52 and the cylinder body 51 can be tightly connected together. The placement member 3 is rotated so that the placement member 3 changes from an inclined state to a vertical state. One end of the clamping rod 57 passes through the second channel 33, the top hole 45, the bottom hole 46 in sequence and is inserted into the insert 47 to connect the fixing member 4 and the placement member 3 as a whole.

[0050] In the known prior art, the base 31 on which the cylinder 51 is placed is mostly fixed on a workbench and cannot be moved or rotated. During the positioning, pre-pressing, and brazing of the cylinder 51 and the top cover 52, the cylinder 51 and the top cover 52 need to be transferred manually or by a robot, which is time-consuming and requires repositioning after each movement to reduce errors caused by misalignment, which is time-consuming and labor-intensive. In addition, the base 31 cannot be rotated, which makes it inconvenient to take and place the cylinder 51 and the top cover 52.

[0051] In summary, in this embodiment, the placing piece 3 is sleeved on the cylinder 51, and the placing piece 3 is rotatably connected to the fixing piece 4. When the placing piece 3 is placed vertically, the card holes of the placing piece 3 and the fixing piece 4 are aligned, and the placing piece 3 and the fixing piece 4 are connected as a whole to form a fixed seat, which is convenient for overall movement. When the placing piece 3 is tilted, the placing piece 3 is placed upside down in the positioning piece 2, and the cylinder 51 and the top cover 52 are supported and positioned, so that the top cover 52 and the cylinder 51 are accurately connected together and pre-connected, thereby realizing rapid positioning and installation of the cylinder 51 and the top cover 52, and solving the problem that the bottom plate 11 cannot rotate and it is inconvenient to take and put the cylinder 51. Example 2

[0052] Reference Figure 1 - Fig.18 A hydraulic cylinder welding method includes: a box body 12, a channel 13 is opened through one side of the box body 12, a stepper motor 55 is connected to the other side of the box body 12, the bottom of the box body 12 is connected to the bottom plate 11, the top of the bottom plate 11 is connected to the diagonal support 14 and the fixed block 17, the side of the fixed block 17 away from the box body 12 is connected to the side of the diagonal support 14 close to the box body 12, the stepper motor 55 is connected to the nut 54 through the screw rod 56, and the box body 12 is provided with a grinding piece 6 and a brazing piece 7, the top of the grinding piece 6 is slidably connected to the top wall of the box body 12, and the grinding piece 6 is used to adjust the cylinder 51 and the top cover 52 The connection part is pre-pressed, and the brazing part 7 is connected to the side wall of the box body 12. The brazing part 7 is used to weld the connection part between the cylinder body 51 and the top cover 52. The top cover 52 is composed of a top plate and a cylinder at the bottom of the top plate. When the longitudinal axis of the placement piece 3 is perpendicular to the bottom plate 11, the placement piece 3 and the fixing piece 4 are fixed by the clamping rod 57 and combined into a fixing seat. The middle part of the fixing piece 4 close to the side of the box body 12 is connected with a wire tube 53, and the inner wall of the wire tube 53 is connected with a nut 54. The nut 54 is threadedly connected to the screw rod 56. The fixing seat enters and exits the box body 12 along the longitudinal axis of the screw rod 56 under the drive of the wire tube 53.

[0053] The grinding component 6 includes: a second motor 61, there are two second motors 61, the top of each second motor 61 is slidably connected to the top wall of the box body 12, the rotating part of each second motor 61 is connected to the grinding plate 63 through the pressure plate 62, the middle part of the side of each second motor 61 is connected to the first hydraulic cylinder 64, the two second motors 61 are close to each other under the action of the first hydraulic cylinder 64, the top of the box body 12 is connected to a water tank, one side of the water tank is connected to a second hydraulic cylinder 65, the telescopic end of the second hydraulic cylinder 65 is connected to a cover plate 67 through a piston rod 66, the bottom of the water tank is connected to a plurality of water spray pipes 68, the bottom of the pressure plate 62 is an arc surface, the bottom of the pressure plate 62 is adapted to the arc surface at the top edge of the top plate, and the grinding plate 63 is adapted to the side of the cylinder 51.

[0054] The brazing component 7 includes: a welding head 71, one side of the welding head 71 is connected to the side wall of the box body 12, the bottom of the welding head 71 is connected to a soldering head 72, the soldering head 72 is connected to solder, and the axis of the soldering head 72, the transverse axis of the screw rod 56 and the mid-perpendicular lines of the two second motors 61 are all located on the same vertical plane.

[0055] A hydraulic cylinder welding method, comprising a hydraulic cylinder welding device according to any one of claims 1 to 7, wherein the workstation where the positioning member 2 is located is the first workstation, the workstation where the pressure grinding member 6 is located is the second workstation, and the workstation where the brazing member 7 is located is the third workstation. First, the placing member 3 and the fixing member 4 are driven by the wire drum 53 to move in and out of the box body 12 along the longitudinal axis direction of the screw rod 56, and the bottom of the fixing member 4 stops moving after contacting the positioning plate 18. At this time, the placing member 3 and the fixing member 4 are located in the first workstation, the placing member 3 rotates, the placing member 3 is placed in the positioning member 2, the cylinder 51 is plugged into the rod body 39, and the cylinder 51 is placed On the placement plate 24, the top cover 52 placed on the second arc plate 25 enters into the cylinder 51 under the pressure of the pressure head 82, completing the pre-connection between the top cover 52 and the cylinder 51, and the placement piece 3 and the fixing piece 4 are fixed by the clamping rod 57 and combined into a fixing seat, and the fixing seat enters and exits the box 12 through the channel 13 driven by the wire tube 53, and then, when the fixing seat moves to the second station, the connection between the cylinder 51 and the top cover 52 is pre-pressed and polished by the grinding piece 6, and finally, the fixing seat moves to the third station, and the pre-pressed connection between the cylinder 51 and the top cover 52 is brazed by the brazing piece 7.

[0056] In this example, see Figure 1 - Fig.18When in use, the fixed seat enters the box body 12 under the drive of the wire drum 53. First, the fixed seat moves to the second station, and the first hydraulic cylinder 64 is started. The telescopic ends of the two first hydraulic cylinders 64 respectively move with a second motor 61, and the two second motors 61 approach each other. The two pressing plates 62 and the two grinding plates 63 all move toward the axial direction close to the cylinder body 51. The pressing plate 62 approaches and contacts the top cover 52. The top cover 52 consists of a top plate and a cylinder at the bottom of the top plate. The bottom of the pressing plate 62 is an arc surface. The bottom of the pressing plate 62 is adapted to the arc surface at the top edge of the cover plate 67. The bottom of the pressing plate 62 squeezes the top of the cover plate 67. At the same time, the grinding plate 63 squeezes the cylinder body 51, and the second hydraulic cylinder 65 is started. The second hydraulic cylinder 65 moves the cover plate 67 downward through the piston rod 66, and the cover plate 67 contacts and presses the top cover 5 2. The diameter of the cover plate 67 is smaller than the diameter of the top cover 52. The cover plate 67 will not hinder the rotation of the pressure plate 62. The cover plate 67 can also protect other parts to avoid deformation or damage during processing. It can also squeeze the edge of the connection part of the top cover 52 to facilitate the connection between the top cover 52 and the cylinder 51. The second motor 61 is started. The rotating end of the second motor 61 rotates with the pressure plate 62 and the grinding plate 63. The pressure plate 62 moves along the circumferential direction of the cover plate 67, so that the edge of the cover plate 67 is concave downward and slightly moved downward. The grinding plate 63 lightly presses the edge of the top of the cylinder 51, so that the cylindrical connection between the cylinder 51 and the top cover 52 is tighter, and the matching clearance between the cylinder 51 and the top cover 52 is reduced, so that a certain pre-tightening force is formed between the cylinder 51 and the top cover 52, thereby completing the pre-compression of the cylinder 51 and the top cover 52. The pre-compression process not only eliminates the matching clearance, but also forms pre-compression. Pre-compression can provide additional sealing effect when the hydraulic cylinder is working, and enhance the sealing performance of the hydraulic cylinder. For some special hydraulic cylinder structures. The pre-stressing process can ensure the close fit between the key and the keyway, optimize the welding structure, and improve the overall performance of the hydraulic cylinder. The pre-stressed welding structure makes the hydraulic cylinder more convenient for subsequent maintenance. For example, if it is necessary to replace the seal or repair the guide sleeve and other parts, the pre-stressing structure can ensure that the cylinder body will not be excessively damaged or deformed during disassembly and reinstallation. Then, the fixed seat moves to the third station, and the first motor 37 can be started. The rotating end of the first motor 37 rotates with the circular plate 38, the rod body 39, the cylinder body 51, and the top cover 52. A large number of friction grooves 58 are opened on the top cover 52 to increase the friction resistance of the cylinder body 51 and avoid relative movement between the cylinder body 51 and the rod body 39. With the welding head 71, the connection between the cylinder body 51 and the top cover 52 after pre-stressing is circumferentially brazed, without moving the brazing part 7, and it may be simpler to realize the positioning of the welding part by rotating the cylinder body, without the need for complex welding head control equipment, and for large or heavy hydraulic cylinders, the welding head may not be able to easily reach all welding parts. After pre-stressing, the cylinder body is more convenient to rotate. The cylinder 51 may also be kept stationary, and the brazing of the connection between the cylinder 51 and the top cover 52 can be completed by rotating the welding head.Since the connection between the cylinder head and the cylinder barrel is tighter after pre-compression, the welding temperature and speed can be better controlled during the welding process, avoiding defects such as deformation or cracks during welding, thereby ensuring the welding quality.

[0057] In summary, in this embodiment, the connection between the top cover 52 and the cylinder 51 is pre-pressed by the pressing and grinding device, so that the cylinder at the bottom of the top cover 52 is more tightly connected to the inner wall of the cylinder 51, thereby reducing the fitting clearance between the cylinder 51 and the top cover 52, so that a certain pre-tightening force is formed between the cylinder 51 and the top cover 52, providing an additional sealing effect when the hydraulic cylinder is working, and enhancing the sealing performance of the hydraulic cylinder. The problem that the cylinder 51 and the top cover 52 are only simply fixed, and there is a certain fitting clearance between the cylinder 51 and the top cover 52. After welding, the pre-tightening force of the connection between the cylinder 51 and the top cover 52 is small. For hydraulic cylinders with higher pressure, thicker cylinder walls and larger cylinder diameters, problems such as stress concentration and cracks caused by the clearance are prone to occur after welding.

[0058] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic cylinder welding device, characterized in that: include: A box body (12), one side of the box body (12) is penetrated by a channel (13), the other side of the box body (12) is connected to a stepper motor (55), the bottom of the box body (12) is connected to a bottom plate (11), the top of the bottom plate (11) is connected to an oblique support (14) and a fixed block (17), a side of the fixed block (17) away from the box body (12) is connected to a side of the oblique support (14) close to the box body (12), and the stepper motor (55) is connected to a screw rod (56). The box (12) is provided with a grinding component (6) and a brazing component (7), the top of the grinding component (6) is slidably connected to the top wall of the box (12), the grinding component (6) is used to pre-press the connection between the cylinder (51) and the top cover (52), the brazing component (7) is connected to the side wall of the box (12), the brazing component (7) is used to weld the connection between the cylinder (51) and the top cover (52), and the top cover (52) is composed of a top plate and a cylinder at the bottom of the top plate; A positioning member (2) is used to guide the moving direction of the top cover (52) and connect the top cover (52) to the cylinder (51), and the bottom of the positioning member (2) is connected to the top of the inclined plate; The positioning member (2) comprises: a first arc plate (21), the first arc plate (21) being connected to the top of the diagonal support (14) via a first support plate (15), both ends of the first arc plate (21) being connected to first side plates (22), a side of the first arc plate (21) away from the box body (12) being connected to a vertical plate (23), a top of the vertical plate (23) being connected to a placement plate (24), a side of the placement plate (24) away from the box body (12) being connected to a second arc plate (25), both ends of the second arc plate (25) being connected to second side plates (26), The first arc plate (21) and the second arc plate (25) are both semicircular plates, the first side plate (22) is matched with the positioning tube (36), the second arc plate (25) is matched with the top cover (52), the placement plate (24) is matched with the cylinder (51), the top of the second arc plate (25) is located above the top of the placement plate (24), the inner diameter of the second arc plate (25) is equal to the diameter of the top cover (52), the inner diameter of the placement plate (24) is equal to the diameter of the cylinder (51), and the inner diameter of the first arc plate (21) is equal to the inner diameter of the positioning tube (36); A placement member (3) used for fixing the cylinder (51) and being placed on the positioning member (2) by means of rotation, wherein the placement member (3) is arranged above the bottom plate (11); The placement member (3) comprises: a base (31), the base (31) being arranged above the bottom plate (11), the two sides of the base (31) being connected with a rotating shaft (32), the side of the rotating shaft (32) being penetrated with a second hole (33), the other two sides of the base (31) being connected with a convex plate (34), one side of each convex plate (34) being connected with a connecting plate (35), the top of the connecting plate (35) being connected with a positioning cylinder (36), the top of the base (31) being provided with a groove, the bottom of the groove being connected with a first motor (37), the rotating part of the first motor (37) being connected with a circular plate (38), the top of the circular plate (38) being connected with a rod body (39), the rod body (39) being sleeved with the cylinder body (51), the top of the circular plate (38) being penetrated with a plurality of friction grooves (58), the plurality of friction grooves (58) being distributed equidistantly in the circumferential direction of the circular plate (38); A fixing member (4) for fixing the placement member (3) perpendicular to the bottom plate (11), the bottom of the fixing member (4) being placed on a fixing block (17); The fixing member (4) comprises: a plate body (41), the bottom of the plate body (41) is slidably connected to the top of the fixing block (17), a third hole (42) is penetrated through one side of the plate body (41) close to the box body (12), the tops of both ends of the plate body (41) are connected to shaft heads (44) through third support (43) plates, a top hole (45) is penetrated through the top of the side of the shaft head (44), and a bottom hole (46) is penetrated through the bottom of the side of the shaft head (44), and two insert tubes (47) are arranged between the two third support (43) plates, and the two insert tubes (47) are symmetrically distributed along the longitudinal axis of the plate body (41), and each of the insert tubes (47) is symmetrically distributed along the longitudinal axis of the plate body (41). The bottom of the insert tube (47) is inserted into the plate body (41), and each of the insert tubes (47) is located directly below a bottom hole (46). A clamping rod (57) is provided above the shaft head (44). When the longitudinal axis of the placement member (3) is perpendicular to the bottom plate (11), one end of the clamping rod (57) passes through the second hole (33), the top hole (45), and the bottom hole (46) in sequence and is inserted into the insert tube (47) to connect the fixing member (4) and the placement member (3) as a whole. The projection area of ​​the top hole (45) is larger than the projection area of ​​the bottom hole (46). A wire tube (53) is connected to the middle of the plate body (41) close to the box body (12); The top of the fixed block (17) is connected to a positioning plate (18), a first hole (19) is formed through the middle of the positioning plate (18), one end of the screw rod (56) passes through the screw tube (53) and the first hole (19), and when the plate body (41) abuts against the positioning plate (18), the placement member (3) rotates from a vertical state to an inclined state, and the placement member (3) matches the positioning member (2); When the longitudinal axis of the placement member (3) is perpendicular to the bottom plate (11), the placement member (3) and the fixing member (4) are fixed by a clamping rod (57) and combined into a fixing seat; a wire drum (53) is connected to the middle of the fixing member (4) close to the box body (12); a nut (54) is connected to the inner wall of the wire drum (53); the nut (54) is threadedly connected to the screw rod (56); the fixing seat moves in and out of the box body (12) along the longitudinal axis of the screw rod (56) under the drive of the wire drum (53); a third hydraulic cylinder (81) is connected to the side of the top of the diagonal support (14) via a second support plate (16); a pressure head (82) is connected to the telescopic end of the third hydraulic cylinder (81); the axis of the pressure head (82) is located in the same straight line as the axis of the virtual circle where the top of the second arc plate (25) is located.

2. The hydraulic cylinder welding device according to claim 1, characterized in that: The grinding component (6) comprises: a second motor (61), wherein there are two second motors (61), the top of each second motor (61) is slidably connected to the top wall of the box body (12), the rotating part of each second motor (61) is connected to a grinding plate (63) via a pressing plate (62), the middle part of the side of each second motor (61) is connected to a first hydraulic cylinder (64), and the two second motors (61) approach each other under the action of the first hydraulic cylinder (64), the top of the box body (12) is connected to a water tank, one side of the water tank is connected to a second hydraulic cylinder (65), the telescopic end of the second hydraulic cylinder (65) is connected to a cover plate (67) via a piston rod (66), the bottom of the water tank is connected to a plurality of water spray pipes (68), the bottom of the pressing plate (62) is an arc surface, the bottom of the pressing plate (62) is adapted to the arc surface at the top edge of the top plate, and the grinding plate (63) is adapted to the side of the cylinder body (51).

3. The hydraulic cylinder welding device according to claim 2, characterized in that: The brazing component (7) comprises a welding head (71), one side of the welding head (71) is connected to the side wall of the box body (12), the bottom of the welding head (71) is connected to a brazing head (72), the brazing head (72) is connected to brazing material, and the axis of the brazing head (72), the transverse axis of the screw rod (56) and the perpendicular midlines of the two second motors (61) are all located on the same vertical plane.

4. A hydraulic cylinder welding method, comprising the hydraulic cylinder welding device according to any one of claims 1 to 3, characterized in that: The workstation where the positioning member (2) is located is the first workstation, the workstation where the grinding member (6) is located is the second workstation, and the workstation where the brazing member (7) is located is the third workstation. First, the placing member (3) and the fixing member (4) are driven by the wire drum (53) to move in and out of the box body (12) along the longitudinal axis direction of the screw rod (56). The bottom of the fixing member (4) stops moving after contacting the positioning plate (18). At this time, the placing member (3) and the fixing member (4) are located in the first workstation, the placing member (3) rotates, the placing member (3) is placed in the positioning member (2), the cylinder (51) is plugged into the rod body (39), the cylinder (51) is placed on the placing plate (24), and is placed on the second arc plate (2 The top cover (52) on the cylinder (51) is pressed by the pressure head (82) to complete the pre-connection between the top cover (52) and the cylinder (51). The placement member (3) and the fixing member (4) are fixed and combined into a fixing seat by the clamping rod (57). The fixing seat enters and exits the box (12) through the channel (13) under the drive of the wire drum (53). Then, when the fixing seat moves to the second station, the connection between the cylinder (51) and the top cover (52) is pre-pressed and polished by the pressing and grinding member (6). Finally, the fixing seat moves to the third station and the connection between the cylinder (51) and the top cover (52) after pre-pressing is brazed by the brazing member (7).

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