Hydraulic cylinder automatic welding equipment

Abstract

The present application relates to the field of welding equipment, especially to a hydraulic cylinder automatic welding equipment. It comprises a workbench, a welding device installed on the workbench, a welding gun installed on the welding device, and a down rod connected to the welding device. The equipment is provided with a down rod, a rotating bearing, a fixed block and a down head cooperation structure. When the down rod rotates with the transmission structure, it realizes relative rotation with the fixed block with the help of the rotating bearing, and cooperates with the first spring and the inner support block to keep the fixed block, the down head and the oil nozzle stationary. It effectively solves the problem of the traditional device that the down part rotates to drive the oil nozzle to deflect, avoids the problems of misalignment and gap between the oil nozzle and the cylinder body, and reduces welding defects such as incomplete fusion, slag inclusion and uneven weld formation.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and more particularly to an automatic welding device using hydraulic cylinders. Background Technology

[0002] Hydraulic cylinders are the core actuators of hydraulic systems, widely used in engineering machinery, metallurgical equipment, agricultural machinery, and other fields. As a crucial component connecting the hydraulic cylinder's oil circuit, the welding quality of the oil nozzle directly determines the cylinder's sealing performance, pressure resistance, and service life.

[0003] Currently, the mainstream welding method in the industry is an automated welding method that uses a downward pressing device to press the nozzle tightly against the cylinder welding surface, and then the welding head rotates around the nozzle to complete the circumferential welding. However, most existing downward pressing structures are integral rigid connections. When the downward pressing device rotates synchronously with the welding head, the friction between the downward pressing head and the nozzle end face will cause the nozzle to rotate together, resulting in a relative offset between the nozzle and the cylinder contact surface, and gaps and misalignment problems on the contact surface. This makes it easy to produce defects such as incomplete fusion, slag inclusion, and uneven weld formation during the welding process, which greatly reduces the weld bonding strength. Summary of the Invention

[0004] To overcome the drawback that when the pressing device rotates synchronously with the welding head, the friction between the pressing head and the nozzle end face will cause the nozzle to rotate together, resulting in relative misalignment between the nozzle and the cylinder body contact surface, and causing gaps and misalignment problems on the contact surface, this invention provides an automatic welding device for hydraulic cylinders.

[0005] The technical solution of the present invention is as follows: an automatic welding device for hydraulic cylinders, comprising a worktable; a welding device mounted on the worktable, and a welding torch mounted on the welding device; a downward pressure rod connected to the welding device; a fixed block rotatably connected to the downward pressure rod; a rotating bearing fixedly connected to the fixed block; the downward pressure rod fixedly connected to the inner side of the rotating bearing; a fixed rod fixedly connected to the fixed block, and a downward pressure head slidably connected to the outer side of the fixed rod; a first spring fixedly connected between the downward pressure head and the fixed block; a wedge block fixedly connected to the fixed rod, and the wedge block sliding within the downward pressure head; a plurality of inner support blocks slidably connected to the lower side of the downward pressure head; a second spring fixedly connected between each inner support block and the downward pressure head; the wedge block having a plurality of wedge surfaces; each wedge surface slidingly contacting the corresponding inner support block; and a fixing assembly for clamping and fixing the cylinder body connected to the worktable.

[0006] Furthermore, the fixing component includes an electric guide rail connected to the worktable; the sliding block of the electric guide rail is fixed to a mounting bracket; and the mounting bracket is equipped with clamps.

[0007] Furthermore, the pressure head is made of high-temperature resistant and wear-resistant alloy steel.

[0008] Furthermore, it also includes rotating rollers; several rotating rollers are rotatably connected to the contact surface between each inner support block and the wedge block.

[0009] By adopting the above structure, the rotating roller can transform the sliding friction between the inner support block and the wedge block into rolling friction, which greatly reduces the frictional resistance when the two move relative to each other, making the action of the wedge block pushing the inner support block smoother and more sensitive; at the same time, it can reduce the wear of the contact surface, avoid component jamming and action failure, and ensure the long-term stability of the inner support structure.

[0010] Furthermore, it also includes a sealing membrane; a sealing membrane is fixed between each inner support block and the lower pressure head.

[0011] Furthermore, it also includes rubber blocks; each inner support block is fixed with a rubber block.

[0012] By adopting the above structure, the present invention allows the rubber block to be in close contact with the inner wall of the nozzle, so that the inner support block and the inner wall of the nozzle form a flexible clamping fit. The rubber block can increase the friction coefficient with the inner wall of the nozzle, effectively improve the clamping friction of the inner support, and avoid the nozzle from slightly moving, slipping or shifting during the welding process.

[0013] Furthermore, the rubber block is made of fluororubber and has a rough surface.

[0014] By adopting the above structure, the fluororubber of this invention possesses excellent high temperature resistance, aging resistance and flame retardancy. It can resist the high temperature radiated in the welding area, avoid the rubber block from softening, melting and aging failure due to heat, and maintain its structural shape and clamping performance for a long time.

[0015] Furthermore, it also includes a protective cover connected to the pressure rod; a suction chamber is provided on the pressure rod; the suction chamber is connected to an external air pump; a first connecting groove is provided inside the fixing rod; the fixing rod passes through the fixing block and the pressure rod; a first suction groove is provided inside the wedge block; the first suction groove is connected to the suction chamber through the first connecting groove; a plurality of second suction grooves are provided on the lower side of the protective cover, each second suction groove facing the inside of the protective cover; a second connecting groove is provided inside the protective cover; each second suction groove is connected to the suction chamber through the second connecting groove.

[0016] Furthermore, it also includes a sliding cover; the sliding cover is fixedly connected to the lower side of the fixed block, and the sliding cover is slidably connected to the lower pressure head; the fixed rod and the first spring are both located inside the sliding cover.

[0017] Furthermore, it also includes warning lights; several warning lights are installed on the welding machine.

[0018] The beneficial effects are as follows: This equipment is equipped with a structure that integrates a pressure rod, a rotating bearing, a fixed block, and a pressure head. When the pressure rod rotates with the transmission structure, it achieves relative rotation with the fixed block through the rotating bearing. Combined with the clamping action of the first spring and the internal clamping of the inner support block, the fixed block, the pressure head, and the nozzle remain stationary. This effectively solves the problem of the pressure component rotating and causing the nozzle to deflect in traditional devices, avoids problems such as misalignment and gaps between the nozzle and the cylinder body, and reduces welding defects such as incomplete fusion, slag inclusions, and uneven weld formation.

[0019] The equipment is equipped with a fixed rod, wedge block, inner support block and second spring. The wedge-shaped surface of the wedge block pushes the inner support block to expand outward. The outer support stroke can be flexibly adjusted according to the inner diameter of the oil nozzle, adapting to various specifications of oil nozzles and broadening the scope of application of the equipment. In addition, the circumferentially distributed inner support blocks can correct the coaxiality of the oil nozzle.

[0020] The system utilizes the suction chamber and protective cover on the lower pressure rod, along with the first connecting groove, the first suction groove, the second suction groove, and the second connecting groove to form a dual-path negative pressure suction structure. When the external air pump is working, one airflow path removes smoke and spatter from the protective cover, purifying the welding environment. The other path creates an inward-to-outward suction airflow inside the nozzle, preventing welding slag and impurities from falling into the cylinder. It also continuously cools the welding area, reducing the heat-affected zone and improving welding quality and the cleanliness of the cylinder interior. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the automatic welding equipment for hydraulic cylinders according to the present invention; Figure 2 This is a cross-sectional view of the protective cover of the present invention; Figure 3 This is a three-dimensional structural diagram of the combined pressure rod, rotating bearing, fixing block, fixing rod and pressure head of the present invention; Figure 4 This is a three-dimensional structural diagram of the combined pressure head, wedge block, inner support block, and second spring of the present invention. Figure 5 This is a cross-sectional view of the combination of the fixing rod, the pressing head, and the wedge block of the present invention; Figure 6 This is a three-dimensional structural diagram of the fixing rod and wedge block of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the combination of the inner support block, rotating roller and rubber block of the present invention; Figure 8 This is a schematic diagram of the welding state of the present invention.

[0022] Component names and serial numbers in the diagram: 1-Workbench, 2-Electric guide rail, 3-Mounting bracket, 4-Welder, 5-Welding torch, 6-Cylinder body, 7-Oil nozzle, 101-Pressing rod, 10101-Suction chamber, 102-Rotating bearing, 103-Fixing block, 104-Fixing rod, 10401-First connecting groove, 105-Pressing head, 106-Wedge block, 10601-Wedge surface, 10602-First suction groove, 107-First spring, 108-Sliding cover, 109-Protective cover, 10901-Second suction groove, 10902-Second connecting groove, 201-Inner support block, 202-Rotating roller, 203-Second spring, 204-Sealing membrane, 205-Rubber block, 206-Warning light. Detailed Implementation

[0023] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Example 1: An automatic welding equipment for hydraulic cylinders, such as Figures 1-8 As shown, it includes a workbench 1, a welder 4, and a welding torch 5; the welder 4 is mounted on the workbench 1, and the welding torch 5 is mounted on the welder 4. It also includes a lower pressure rod 101, a rotating bearing 102, a fixing block 103, a fixing rod 104, a lower pressure head 105, a wedge block 106, a first spring 107, an inner support block 201, a second spring 203, and a fixing assembly; the lower pressure rod 101 is connected to the welding machine 4, and a transmission structure is installed inside the welding machine 4, which can drive the lower pressure rod 101 to move up and down and rotate. The transmission structure is existing technology and will not be described in detail here; the lower pressure rod 101 is rotatably connected to the lower side of the fixing block 103; the rotating bearing 102 is fixedly connected to the fixing block 103; the lower end of the lower pressure rod 101 is fixedly connected to the inner side of the rotating bearing 102; the fixing block 104... A fixed rod 104 is fixedly connected to the upper part of the worktable 103. A lower pressure head 105 is slidably connected to the outer side of the fixed rod 104. A first spring 107 is fixedly connected between the lower pressure head 105 and the fixed block 103. A wedge block 106 is fixedly connected to the lower side of the fixed rod 104 and slides inside the lower pressure head 105. Four inner support blocks 201 are slidably connected to the lower side of the lower pressure head 105. A second spring 203 is fixedly connected between each inner support block 201 and the lower pressure head 105. The wedge block 106 is provided with four wedge surfaces 10601. Each wedge surface 10601 is in sliding contact with the corresponding inner support block 201. A fixed assembly is connected to the worktable 1.

[0025] The fixing components include a connection between the electric guide rail 2 and the mounting bracket 3; the electric guide rail 2 is installed on the worktable 1; the sliding block of the electric guide rail 2 is fixedly connected to the mounting bracket 3; the mounting bracket 3 is provided with a clamp, and the cylinder 6 is fixedly installed on the mounting bracket 3 by the clamp.

[0026] Working principle of Example 1: During operation, the operator uses clamps to securely mount the cylinder body 6 onto the mounting bracket 3, then controls the electric guide rail 2 to move, causing the sliding seat and mounting bracket 3 to shift as a whole, moving the welder of the cylinder body 6 directly below the lower pressure rod 101; then the oil nozzle 7 is placed at the preset welding position on the cylinder body 6; after starting the equipment, the welder 4 drives the lower pressure rod 101 to move downwards; in the initial state of the equipment as follows... Figure 5 As shown, the four inner support blocks 201 retract inward under the elastic force of the second spring 203. Their overall outer diameter is smaller than the inner diameter of the nozzle 7, allowing them to easily extend into the nozzle 7. As the pressing rod 101 continues to move downward, the lower end face of the pressing head 105 contacts and adheres to the upper end face of the nozzle 7. At this point, the inner support blocks 201 are completely inserted into the inner cavity of the nozzle 7. As the pressing rod 101 continues to move downward, the fixing block 103 moves downward simultaneously and squeezes the first spring 107. The first spring 107 contracts under pressure and generates a continuous downward elastic pressing force, causing the pressing head 105 to press tightly against the surface of the nozzle 7, improving the pressing stability between the two. As the pressing rod 101 moves further downward, it will drive the fixing rod 104 and the wedge block 106 to move downward simultaneously. As the wedge block 106 descends, its outer wedge surface 10601 pushes against the corresponding inner support block 201 one by one, overcoming the elastic force of the second spring 203 and pushing the four inner support blocks 201 outwards synchronously until the outer surface of the inner support block 201 is tightly attached to the inner wall of the oil nozzle 7. The oil nozzle 7 is clamped and positioned by means of multi-point inner support. The outer support stroke of the inner support block 201 can be adjusted by the stroke change of the wedge surface 10601, which can adapt to oil nozzles 7 with different inner diameter specifications, realize the universality of multiple workpieces, effectively improve the adaptability and performance of the equipment, and the inner support block 201 forms a uniform circumferential support for the oil nozzle 7 from the inside, which can effectively correct the coaxiality of the oil nozzle 7 and avoid the oil nozzle 7 from being skewed or offset.

[0027] After the nozzle 7 is clamped and internally supported, the welder 4 controls the welding torch 5 to start and perform welding operations. Simultaneously, the built-in transmission structure drives the lower pressure rod 101 to rotate, thereby driving the welding torch 5 to perform a circular motion around the nozzle 7, completing the automatic welding of the circumferential seam between the nozzle 7 and the cylinder body 6. During the rotation of the lower pressure rod 101, the rotating bearing 102 enables relative rotation between the lower pressure rod 101 and the fixed block 103. At this time, the lower pressure head 105, under the action of the first spring 107, constantly presses against the top surface of the nozzle 7, while the internal support block 201 outwardly supports the inner wall of the nozzle 7, with the top clamping working in conjunction with the internal multi-point support. The bidirectional limiting mechanism significantly increases the rotational resistance of the fixed block 103, ensuring that the fixed block 103, fixed rod 104, lower pressure head 105, wedge block 106, inner support block 201, second spring 203, and oil nozzle 7 remain stationary and do not rotate with the lower pressure rod 101. This avoids the problem of the oil nozzle 7 deflecting due to the rotation of the lower pressure component during operation of traditional equipment, and prevents relative slippage, gaps, and misalignment between the oil nozzle 7 and the cylinder body 6. It also reduces defects such as incomplete fusion, slag inclusions, and uneven weld formation during welding, effectively ensuring the weld bonding strength and improving the welding quality of the finished product.

[0028] The lower pressure head 105 is made of high temperature and wear-resistant alloy steel. The high temperature and wear-resistant alloy steel can effectively resist welding heat radiation and high temperature burning, prevent the lower pressure head 105 from softening and deforming, and has excellent surface hardness and wear resistance, which can maintain the flatness of the contact end face for a long time and ensure the clamping accuracy of the oil nozzle 7.

[0029] It also includes rotating rollers 202; three rotating rollers 202 are rotatably connected to the contact surface between each inner support block 201 and the wedge block 106; the rotating rollers 202 can convert the sliding friction between the inner support block 201 and the wedge block 106 into rolling friction, which greatly reduces the frictional resistance when the two move relative to each other, making the action of the wedge block 106 pushing the inner support block 201 smoother and more sensitive; at the same time, it can reduce the wear of the contact surface, avoid component jamming and action failure, and ensure the long-term stability of the inner support structure.

[0030] It also includes a sealing membrane 204; a sealing membrane 204 is fixed between each inner support block 201 and the lower pressure head 105; the sealing membrane 204 seals the sliding gap between the inner support block 201 and the lower pressure head 105, preventing welding slag, metal spatter and dust particles generated during welding from entering the gap, preventing impurities from accumulating and jamming the movement of the parts, and ensuring that the inner support block 201 can slide smoothly.

[0031] It also includes rubber blocks 205; each inner support block 201 is fixedly connected to a rubber block 205; the rubber blocks 205 are in close contact with the inner wall of the nozzle 7, so that the inner support block 201 and the inner wall of the nozzle 7 form a flexible clamping fit; the rubber blocks 205 can increase the friction coefficient with the inner wall of the nozzle 7, effectively improve the clamping friction of the inner support, and avoid the nozzle 7 from slightly moving, slipping or shifting during the welding process; at the same time, the rubber blocks 205 have the characteristics of buffering and shock absorption and flexible fit, which can prevent the metal inner support block 201 from rigidly squeezing and scratching the inner wall of the nozzle 7, causing damage to the threads of the inner wall of the nozzle 7 and affecting subsequent use.

[0032] The rubber block 205 is made of fluororubber and has a rough surface. Fluororubber has excellent high temperature resistance, aging resistance and flame retardancy. It can resist the high temperature radiated by the welding area and prevent the rubber block 205 from softening, melting and aging failure due to heat. It can maintain its structural shape and clamping performance for a long time. The rough surface can further increase the contact friction between the rubber block 205 and the inner wall of the nozzle 7, strengthen the internal support positioning effect and prevent the nozzle 7 from rotating circumferentially or shifting radially during the welding process.

[0033] Example 2: Based on Example 1, such as Figure 1 and Figures 5-6 As shown, it also includes a protective cover 109; the protective cover 109 is fixedly connected to the lower pressure rod 101; the welding torch 5 passes through and is inside the protective cover 109; a suction chamber 10101 is opened on the lower pressure rod 101; the suction chamber 10101 is connected to an external air pump; a first connecting groove 10401 is opened in the fixing rod 104; the fixing rod 104 passes through the fixing block 103 and the lower pressure rod 101; a first suction groove 10602 is opened in the wedge block 106; the first suction groove 10602 is connected to the suction chamber 10101 through the first connecting groove 10401; four second suction grooves 10901 are opened on the lower side of the protective cover 109, each second suction groove 10901 faces the inside of the protective cover 109; a second connecting groove 10902 is opened in the protective cover 109; each second suction groove 10901 is connected to the suction chamber 10101 through the second connecting groove 10902.

[0034] It also includes a sliding cover 108; the sliding cover 108 is fixedly connected to the lower side of the fixing block 103, and the sliding cover 108 is slidably connected to the lower pressure head 105; the fixing rod 104 and the first spring 107 are both located inside the sliding cover 108.

[0035] It also includes an alarm light 206; two alarm lights 206 are installed on the welder 4.

[0036] Working principle of Example 2: During the welding process, the protective cover 109 provides full coverage protection for the entire welding area, effectively blocking high-temperature welding sparks and molten slag from splashing outwards. This prevents the spatter from damaging the workpiece surface and surrounding equipment, and also prevents spatter from falling into the oil nozzle 7, causing scratches on the inner wall and blockage defects. During welding operations, an external air pump is activated to continuously draw negative pressure into the suction chamber 10101, creating a stable negative pressure airflow between the second connecting groove 10902 and the second suction groove 10901. This quickly removes welding fumes, suspended particles, and fine spatter accumulated inside the protective cover 109, achieving source dust removal in the welding area and preventing fumes from accumulating and affecting the welding visibility and weld formation quality. Simultaneously, the negative pressure suction in the suction chamber 10101 allows the first connecting groove 10401 and the first suction groove 10602 to simultaneously form negative pressure suction. This creates a directional suction effect inside the nozzle 7, allowing outside air to enter the cylinder from both ends of the cylinder body 6, then flow upward through the inner hole of the nozzle 7 and merge into the suction channel, forming an airflow from inside the cylinder to the welding area. This prevents welding debris and dust particles from falling into the cylinder body 6. At the same time, the continuous airflow can quickly remove the high-temperature heat accumulated in the welding heat-affected zone, simultaneously cooling the weld, nozzle 7, and the contact surface, reducing welding thermal deformation, residual stress, and grain coarsening, and improving weld density and structural strength.

[0037] Furthermore, the sliding cover 108 can completely enclose and shield the internal fixed rod 104 and the first spring 107, preventing the fine welding slag and dust impurities adsorbed during the negative pressure suction process from adhering and accumulating on the rod and spring structure. This prevents impurities from jamming the sliding fit gap, causing the spring to jam and fail, and causing the extension stroke to deviate. It effectively ensures the smooth sliding of the fixed rod 104 and the elastic compensation accuracy of the first spring 107, and improves the long-term operational stability of the equipment.

[0038] Furthermore, during equipment operation, the alarm light 206 can simultaneously provide working condition lighting prompts. When the equipment is performing normal welding operations, it displays a normal light warning. When fault conditions such as abnormal negative pressure suction, mechanism jamming, insufficient pressure, or workpiece positioning deviation occur, the alarm light 206 can promptly report the abnormal status of the equipment through flashing lights and color changes, which facilitates quick troubleshooting and repair by staff, avoids batch welding defects caused by operating with faults, and improves equipment operation safety and production yield.

[0039] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. An automatic welding device for hydraulic cylinders, comprising a worktable (1); a welding device (4) is mounted on the worktable (1), and a welding torch (5) is mounted on the welding device (4); characterized in that, It also includes a pressure rod (101) connected to the welding machine (4); a fixing block (103) is rotatably connected to the pressure rod (101); a rotating bearing (102) is fixed to the fixing block (103); the pressure rod (101) is fixed to the inside of the rotating bearing (102); a fixing rod (104) is fixed to the fixing block (103), and a pressure head (105) is slidably connected to the outside of the fixing rod (104); a first spring (107) is fixed between the pressure head (105) and the fixing block (103); the fixing rod (104) A wedge block (106) is fixedly connected to the upper part, and the wedge block (106) slides inside the lower pressure head (105); several inner support blocks (201) are slidably connected to the lower side of the lower pressure head (105); a second spring (203) is fixedly connected between each inner support block (201) and the lower pressure head (105); the wedge block (106) is provided with several wedge surfaces (10601); each wedge surface (10601) slides in contact with the corresponding inner support block (201); a fixing component for clamping and fixing the cylinder body (6) is connected on the worktable (1).

2. The automatic welding equipment for hydraulic cylinders according to claim 1, characterized in that, The fixed assembly includes an electric guide rail (2) connected to the worktable (1); a mounting bracket (3) is fixed to the sliding block of the electric guide rail (2); and a clamp is provided on the mounting bracket (3).

3. The automatic welding equipment for hydraulic cylinders according to claim 1, characterized in that, The pressure head (105) is made of high temperature and wear resistant alloy steel.

4. The automatic welding equipment for hydraulic cylinders according to claim 1, characterized in that, It also includes a rotating roller (202); several rotating rollers (202) are rotatably connected to the contact surface between each inner support block (201) and the wedge block (106).

5. The automatic welding equipment for hydraulic cylinders according to claim 4, characterized in that, It also includes a sealing membrane (204); a sealing membrane (204) is fixed between each inner support block (201) and the lower pressure head (105).

6. The automatic welding equipment for hydraulic cylinders according to claim 5, characterized in that, It also includes rubber blocks (205); each inner support block (201) is fixed with a rubber block (205).

7. The automatic welding equipment for hydraulic cylinders according to claim 6, characterized in that, The rubber block (205) is made of fluororubber and has a rough surface.

8. The automatic welding equipment for hydraulic cylinders according to claim 1, characterized in that, It also includes a protective cover (109) connected to the pressure rod (101); a suction chamber (10101) is provided on the pressure rod (101); the suction chamber (10101) is connected to an external air pump; a first connecting groove (10401) is provided in the fixing rod (104); the fixing rod (104) passes through the fixing block (103) and the pressure rod (101); a first suction groove (10602) is provided in the wedge block (106); the first connecting groove (10402) passes through the wedge block (10602) and the pressure rod (10403) and the pressure rod (101 ... 401) Connect the first suction groove (10602) to the suction cavity (10101); a number of second suction grooves (10901) are provided on the lower side of the protective cover (109), and each second suction groove (10901) faces the inside of the protective cover (109); a second connecting groove (10902) is provided inside the protective cover (109); each second suction groove (10901) is connected to the suction cavity (10101) through the second connecting groove (10902).

9. The automatic welding equipment for hydraulic cylinders according to claim 8, characterized in that, It also includes a sliding cover (108); the sliding cover (108) is fixedly connected to the lower side of the fixed block (103), and the sliding cover (108) is slidably connected to the lower pressure head (105); the fixed rod (104) and the first spring (107) are both located inside the sliding cover (108).

10. An automatic welding equipment for hydraulic cylinders according to any one of claims 1-9, characterized in that, It also includes an alarm light (206); several alarm lights (206) are installed on the welder (4).

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