Pre-positioning device for welding operation of cylinder barrel of oil cylinder

Abstract

The utility model provides a pre-positioning device for oil cylinder barrel welding operation, which comprises a processing bed body, a group of V-shaped blocks are arranged on the upper side of the processing bed body, and the centers of the V-shaped blocks coincide with the reference of the pre-positioning device for the oil cylinder barrel welding operation; a vertically-arranged guide column is arranged on the upper side of the machining bed body, a vertical telescopic feeding guide sleeve is arranged on the guide column, and the guide sleeve, the guide column and the spring are coaxially installed in a matched mode. An elbow joint positioning shaft is arranged on the guide sleeve, the positioning shaft and an oil through hole in the cylinder barrel are guided through an inclined face, and the positioning shaft is finally overlapped with the step face after being pressed in. A gap of 0.03-0.06 mm is formed between the guide column and the guide sleeve, the cylinder barrel and the elbow joint can be conveniently and quickly fixed by taking a machined oil pipe step positioning hole as a reference, an initial position point before welding is determined, automatic welding of the elbow joint and the cylinder barrel is realized, the error is small, and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinder processing, and particularly relates to a pre-positioning device for the welding operation of an oil cylinder barrel. Background Technique

[0002] In the hydraulic system of a forklift oil cylinder, the actuators are mainly divided into hydraulic motors and hydraulic cylinders. Among them, the lifting oil cylinder in the forklift hydraulic system is used to drive the fork teeth to lift the goods up and down. The lifting oil cylinder is the main actuator in the forklift oil cylinder hydraulic system.

[0003] The elbow joint on the lifting oil cylinder is mainly used for oil return and exhaust. The contact surface between the outer circle of the elbow joint welded to the cylinder barrel is a skew line. During welding, it is necessary to ensure that the strength and tightness of the weld seam meet the product use requirements. Previously, manual electrode welding was always used for the operation. The welding process was uncontrollable. The leakage rate during the post-weld airtightness test was 5-10%. The leaking lifting oil cylinder body needed to be ground and repaired by welding. The production cycle was long and the cost was high. Using the existing automatic welding equipment for elbow joints and cooperating with a robotic arm to achieve batch automatic welding production, the leakage rate during the pressure test detection was less than 0.2%. The welding process was of stable quality, the efficiency was increased by 20%, the production cycle was shortened, and the cost of repair welding was greatly reduced.

[0004] However, the robotic arm of the existing automatic welding equipment has very precise requirements for the initial position point before welding the elbow joint. If there is a deviation in the initial position, subsequent welding will cause a large degree of deviation. Now, through the method of manual visual alignment and manual electrode welding, not only is the efficiency low, but also the post-weld appearance forming difference is large, the process is unstable, and the leakage rate during the subsequent airtightness test is relatively high, which is not conducive to batch welding production operations. Content of the Utility Model

[0005] The purpose of the utility model is to provide a pre-positioning device for the welding operation of an oil cylinder barrel to solve the problems raised in the above background technique:

[0006] (1) How to use the oil passage hole of the cylinder barrel that cooperates with the elbow joint as a reference to conveniently and quickly fix the elbow joint, and determine the initial position point before welding, so as to realize the automatic welding of the elbow joint and the cylinder barrel, with reliable quality and high efficiency.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pre-positioning device for the welding operation of an oil cylinder barrel;

[0009] It includes a processing bed body and a pre-positioning component. The upper end surface of the processing bed body is provided with a working station for the welding operation of the elbow joint of the oil cylinder and the cylinder barrel;

[0010] The pre-positioning component is arranged beside the working station of the processing bed body. The pre-positioning component includes a positioning plate, a guide post, a guide sleeve and a positioning shaft. The positioning plate is fixedly connected to the processing bed body. The guide post is vertically and fixedly connected to the positioning plate. The guide sleeve is sleeved on the guide post, and the guide sleeve can freely rotate circumferentially along the guide post and can freely move circumferentially along the guide post. The starting end of the positioning shaft is fixedly connected to the side wall of the guide sleeve. A 90° bend is provided in the middle of the positioning shaft. The end of the positioning shaft can be matched with the oil passage hole of the cylinder barrel of the oil cylinder.

[0011] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0012] Furthermore, the pre-positioning component further includes a spring. The spring is sleeved on the guide post. The upper end of the spring abuts against the guide sleeve, and the lower end of the spring abuts against the positioning plate.

[0013] Furthermore, the pre-positioning component further includes a limit plate. The limit plate is vertically and fixedly connected to the positioning plate. A U-shaped groove is formed on the upper end surface of the limit plate. The limit plate is located between the guide post and the working station of the processing bed body.

[0014] Furthermore, the groove width of the U-shaped groove is 0.04 - 0.07 mm larger than the diameter of the positioning shaft, and the fitting clearance between the guide post and the guide sleeve is 0.03 - 0.06 mm.

[0015] Furthermore, a tapered surface guide is provided on the side wall of the end head of the positioning shaft.

[0016] Furthermore, a number of V-shaped blocks are fixedly connected to the working station of the processing bed body at intervals in sequence. The arrangement direction of the number of V-shaped blocks is the same as the length direction of the cylinder barrel of the oil cylinder. A V-shaped groove for restricting the circumferential rotation of the cylinder barrel of the oil cylinder is provided on the V-shaped block.

[0017] Furthermore, the pre-positioning component further includes a bracket. The positioning plate is fixedly connected to the processing bed body through the bracket.

[0018] After adopting such a structure, the pre-positioning device for the welding operation of the oil cylinder barrel takes the oil passage hole of the cylinder barrel as the benchmark, conveniently and quickly fixes the cylinder barrel, and determines the initial position point before welding of the bent joint, realizing the automatic welding of the bent joint and the cylinder barrel, with small error and high efficiency.

[0019] In addition, during production change, when the diameter of the cylinder barrel and the position of the positioning hole change, adjust the positions of the corresponding horizontal bottom plate and the positioning pin hole, and the height difference in the diameter direction can be compensated by using the spring. The limiting device is connected to the positioning threaded hole of the horizontal bottom plate, and the replacement is convenient and fast, greatly shortening the production change time in the multi-variety and small-batch production mode.

[0020] The overall mechanism positioning accuracy of the pre-positioning device for the welding operation of the oil cylinder barrel is accurate to meet the requirements of repeated welding positioning.

[0021] The pre-positioning device design mechanism for the welding operation of this oil cylinder barrel is simple and fast. The manual auxiliary operation is simple, fast and convenient. It can cooperate with the robotic arm to realize the welding of cylinder barrel products such as bent pipes of hydraulic cylinders. It can quickly change production and weld for multiple varieties and small batches, and has a wide range of compatible products. The device is simple to process and has strong practicability. Brief Description of the Drawings

[0022] Figure 1 Fig. is a perspective view of the use state of an embodiment of the pre-positioning device for the welding operation of this oil cylinder barrel.

[0023] Figure 2 Fig. is the front view of an embodiment of the pre-positioning device for the welding operation of this oil cylinder barrel.

[0024] Figure 3 Fig. is the front view of the pre-positioning assembly in an embodiment of the pre-positioning device for the welding operation of this oil cylinder barrel.

[0025] Description of the reference numerals in the figures:

[0026] Processing bed body - 100; V-block - 110; V-groove - 111; Bracket - 210; Positioning plate - 220; Guide post - 230; Guide sleeve - 240; Spring - 250; Limit plate - 260; U-groove - 261; Positioning shaft - 270; Conical surface - 271; Cylinder barrel - 300; Robotic arm - 400. Detailed Description of the Preferred Embodiments

[0027] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Please refer to Figures 1 to 3 .

[0031] The pre-positioning device for the welding operation of the cylinder barrel of this oil cylinder includes a processing bed body 100 and a pre-positioning component.

[0032] On the upper end surface of the processing bed body 100, there is a working station for the welding operation of the elbow joint of the oil cylinder and the cylinder barrel 300. Two V-shaped blocks 110 are fixedly connected in sequence and at intervals on the working station of the processing bed body 100. The arrangement direction of the two V-shaped blocks 110 is consistent with the length direction of the cylinder barrel 300 of the oil cylinder. The V-shaped blocks 110 are provided with V-shaped grooves 111 for restricting the circumferential rotation of the cylinder barrel 300 of the oil cylinder.

[0033] The pre-positioning component is arranged beside the working station of the processing bed body 100. The pre-positioning component includes a positioning plate 220, a guide post 230, a guide sleeve 240, a spring 250, a limiting plate 260, a bracket 210 and a positioning shaft 270.

[0034] The bracket 210 is welded and fixed on the processing bed body 100. The positioning plate 220 is fixedly connected to the bracket 210 by bolts. The guide post 230 is vertically welded and fixed on the positioning plate 220. The guide sleeve 240 is sleeved on the guide post 230, and the guide sleeve 240 can freely rotate circumferentially along the guide post 230 and can freely move circumferentially along the guide post 230. The spring 250 is sleeved on the guide post 230. The upper end of the spring 250 abuts against the guide sleeve 240, and the lower end of the spring 250 abuts against the positioning plate 220.

[0035] On the upper end surface of the limiting plate 260, a U-shaped groove 261 is opened. The limiting plate 260 is located between the guide post 230 and the working station of the processing bed body 100. The groove width of the U-shaped groove 261 is 0.04 - 0.07 mm larger than the diameter of the positioning shaft 270.

[0036] The starting end of the positioning shaft 270 is fixedly connected to the side wall of the guide sleeve 240. The middle part of the positioning shaft 270 is provided with a 90° bend. The end of the positioning shaft 270 can be matched with the oil hole of the cylinder barrel 300 of the oil cylinder. The side wall of the end head of the positioning shaft 270 is provided with an inlet conical surface 271 with a C1 chamfer for guiding, so as to realize the initial positioning of the oil hole of the cylinder barrel 300.

[0037] Taking the oil hole of the oil pipe step after machining as the reference, the cylinder barrel 300 and the elbow joint are fixed conveniently and quickly, and the initial position point before welding is determined, so as to realize the automatic welding of the elbow joint and the cylinder barrel 300.

[0038] During use, first, according to the outer diameter size of the cylinder barrel 300 and the distance from the oil hole to the end face of the cylinder barrel 300, adjust the positioning plate 220 of the pre-positioning component and lock it with bolts. The outer diameter of the common lifting cylinder barrel 300 is The range has a center height difference of 11.5 mm. The height difference can be compensated by the spring 250 on the guide post 230 in the vertical direction. The cylinder barrel 300 is placed on the V-shaped block 110, with the oil passage hole of the cylinder barrel 300 facing upward. The bent end of the manual pressing positioning shaft 270 is pressed to drive the guide sleeve 240 and the guide post 230 to move downward. Guided by the conical surface 271 of the positioning shaft 270 until the step on the positioning shaft 270 and the step surface of the oil passage hole of the cylinder barrel 300 are completely fitted, thus completing the positioning of the cylinder barrel 300 before welding.

[0039] After the cylinder barrel 300 is positioned, then release it. Under the action of the spring 250 force, the guide sleeve 240 connected to the positioning shaft 270 moves upward. After rising above the U-shaped limit plate 260, it rotates to the other side to avoid interference with the subsequent automatic welding and the robotic arm 400. After determining the position of the oil passage hole of the cylinder barrel 300, start using the welding robotic arm 400 to perform full welding of the bent joint, and the welding track is a intersecting line.

[0040] The above is only one implementation mode of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several variations and improvements can be made, and these should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A pre-positioning device for the welding operation of an oil cylinder barrel, characterized in that: It includes a processing bed body (100) and a pre-positioning component. On the upper end surface of the processing bed body (100), there is a working station for the welding operation of the elbow joint of the oil cylinder and the barrel (300); The pre-positioning component is arranged beside the working station of the processing bed body (100). The pre-positioning component includes a positioning plate (220), a guide post (230), a guide sleeve (240) and a positioning shaft (270). The positioning plate (220) is fixedly connected to the processing bed body (100). The guide post (230) is vertically and fixedly connected to the positioning plate (220). The guide sleeve (240) is sleeved on the guide post (230), and the guide sleeve (240) can freely rotate circumferentially along the guide post (230) and can freely move circumferentially along the guide post (230). The starting end of the positioning shaft (270) is fixedly connected to the side wall of the guide sleeve (240). The middle part of the positioning shaft (270) is provided with a 90° bend, and the end of the positioning shaft (270) can be matched with the oil hole of the barrel (300) of the oil cylinder.

2. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 1, characterized in that: The pre-positioning component further includes a spring (250). The spring (250) is sleeved on the guide post (230). The upper end of the spring (250) abuts against the guide sleeve (240), and the lower end of the spring (250) abuts against the positioning plate (220).

3. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 1, characterized in that: The pre-positioning component further includes a limiting plate (260). The limiting plate (260) is vertically and fixedly connected to the positioning plate (220). A U-shaped groove (261) is opened on the upper end surface of the limiting plate (260). The limiting plate (260) is located between the guide post (230) and the working station of the processing bed body (100).

4. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 3, characterized in that: The groove width of the U-shaped groove (261) is 0.04 - 0.07 mm larger than the diameter of the positioning shaft (270), and the clearance between the guide post (230) and the guide sleeve (240) is 0.03 - 0.06 mm.

5. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 1, characterized in that: The side wall of the end head of the positioning shaft (270) is provided with an inlet taper surface (271) for guiding.

6. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 1, characterized in that: A number of V-shaped blocks (110) are fixedly connected to the working station of the processing bed body (100) at intervals in sequence. The arrangement direction of the number of V-shaped blocks (110) is the same as the length direction of the barrel (300) of the oil cylinder. A V-shaped groove (111) for restricting the circumferential rotation of the barrel (300) of the oil cylinder is provided on the V-shaped block (110).

7. The pre-positioning device for the welding operation of an oil cylinder barrel according to claim 6, characterized in that: The pre-positioning component further includes a bracket (210). The positioning plate (220) is fixedly connected to the processing bed body (100) through the bracket (210).

Images