Contact tube device with external elastic compensation structure and welding gun

Abstract

The utility model discloses a contact tube device with an external elastic compensation structure and a welding gun, the contact tube device adopts an elastic sheet to drive a conductive block to press on a welding wire for conduction, the elastic sheet is extruded by an extrusion block so as to control the pressure on the welding wire, and the extrusion block is driven by a sliding sleeve so as to control the pressure on the welding wire. The sliding sleeve applies pressure to the elastic piece through the extrusion block by means of pulling force applied by the spring. The pressure of the conductive block on the welding wire can be controlled by adjusting the tension of the spring, and meanwhile, the conductive block and the welding wire can be pressed and conducted by utilizing the elastic force of the elastic piece and the spring along with the abrasion of the conductive block, so that the use stability is greatly improved, and the service cycle is greatly prolonged; theoretically, the conductive block needs to be overhauled and replaced only when the conductive block cannot be tightly pressed with the welding wire for conduction. The current test result is that the period of replacing the conductive block in the mode is three times that of replacing the conductive nozzle in the traditional mode, and only the elastic sheet and the conductive block need to be replaced, so that the equipment is long in continuous operation time, low in cost and very suitable for long-time use of automatic equipment.

Description

Technical Field

[0001] This utility model relates to electric welding technology and welding torch technology, and in particular to a conductive nozzle device and welding torch with an external elastic compensation structure. Background Technology

[0002] The contact tip of a welding torch is a crucial component for conducting electricity to the welding wire. In practical use, the outer diameter of the welding wire is slightly smaller than the orifice of the contact tip. This ensures effective contact and conductivity between the welding wire and the contact tip while preventing excessive damping that could affect wire feeding. During use, friction occurs between the welding wire and the contact tip, making the contact tip a consumable item. Typically, after 20-40 hours of use, wear on the inner hole of the contact tip can lead to poor contact between the welding wire and the contact tip, affecting welding results and causing arc backfire.

[0003] Currently, the need to replace the contact tip is mainly determined by the worker's experience during manual welding. However, automated equipment, due to its continuous operation, generally requires regular and frequent maintenance and replacement, which incurs significant labor and maintenance costs, affects continuous production, and reduces production efficiency.

[0004] Therefore, improving the service life and stability of the conductive tip during automated welding, as well as reducing its operating costs, are technical problems that need to be solved. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide a conductive nozzle device and welding torch with an external elastic compensation structure, which can improve the service life and stability of the conductive nozzle, while reducing the cost of use.

[0006] To achieve the above objectives, this utility model provides a conductive nozzle device with an external elastic compensation structure, including a connecting seat and a conductive nozzle. The connecting seat has a through-hole, and a connecting portion is provided on one end of the connecting seat that is inserted into the nozzle cavity. The conductive nozzle has a threaded portion that is inserted into and assembled with a connecting screw hole. The conductive nozzle has a conductive nozzle hole, and a through notch is provided on the side wall of the conductive nozzle.

[0007] A spring sheet is installed in the notch. The spring sheet is elastic and has an inclined section. The inclined section fits into the pressing slope of the pressing block. The pressing block is installed on the inner wall of the sliding sleeve. The end of the spring sheet away from the mounting seat is assembled with the conductive block. The conductive block is pressed and conductive with the welding wire. The sliding sleeve is assembled with one end of the spring, and the other end of the spring is directly or indirectly assembled with the connecting seat.

[0008] As a further improvement of this utility model, a sliding section is provided at the location corresponding to the notch of the conductive nozzle, and the sliding sleeve is fitted outside the sliding section.

[0009] As a further improvement of this utility model, a mounting base is installed or provided in the notch, and the spring is assembled with the mounting base, with the spring installed in the notch.

[0010] As a further improvement of this utility model, a conductive block groove is provided on the conductive block, and the inner wall of the conductive block groove is in close contact with the welding wire for conduction.

[0011] As a further improvement of this utility model, the sliding sleeve is provided with a sliding sleeve ring, and the sliding sleeve ring is provided with a first inner sleeve ring. The first inner sleeve ring is assembled with one end of the spring, the spring is fitted outside the conductive nozzle and the other end is fitted on the second inner sleeve ring. The second inner sleeve ring is provided on the rotating sleeve, and the rotating sleeve is fitted outside the connecting part. An adjusting pin is installed on the second inner sleeve ring, and the adjusting pin passes through the helical gap of the spring.

[0012] As a further improvement of this utility model, the first inner sleeve ring and the sliding sleeve ring are installed in the sleeve cavity of the protective sleeve, and the protective sleeve is fitted outside the rotating sleeve and is matched with the rotating sleeve.

[0013] The outer wall of the sliding sleeve is provided with indicator grooves distributed along its axial direction, and the end of the protective sleeve near the indicator groove is provided with a scale, which cooperates with the indicator groove.

[0014] As a further improvement of this utility model, the locking screw passes through the sheath and the rotating sleeve and presses against the outer wall of the connecting part, so that the sheath and the rotating sleeve cannot rotate relative to the connecting part.

[0015] As a further improvement of this utility model, a second retaining ring and a first retaining ring are respectively installed at the end of the second inner ring and the end of the rotating sleeve of the connecting part, and the ends of the second retaining ring and the first retaining ring are close to or close to the end of the second inner ring and the end of the rotating sleeve, respectively.

[0016] As a further improvement of this utility model, an insulating block is installed in the notch. The insulating block is made of insulating material and has a second contact installed on it. The second contact is connected to one end of the wire for conduction.

[0017] The sliding block is made of conductive material and engages with the notch and slides to transmit the current of the conductive nozzle; a first contact is installed on the sliding block, the first contact is directly opposite the second contact, and the first contact can be pressed tightly with the second contact to conduct electricity after it moves down;

[0018] The wire is connected to the current detection device. When the first contact and the second contact come into contact, the wire becomes energized. The current detection device detects that the wire is energized and then inputs a signal to the control device.

[0019] This utility model also discloses a welding torch, which includes the above-mentioned conductive nozzle device.

[0020] The beneficial effects of this utility model are:

[0021] This invention employs a spring-loaded contact spring to press a conductive block firmly against the welding wire for conductivity. The spring-loaded contact spring is compressed by a pressing block to control the pressure on the welding wire. The pressing block is driven by a sliding sleeve, which utilizes the tension applied by a spring to press the spring-loaded contact spring. The pressure of the conductive block on the welding wire can be controlled by adjusting the spring tension. Furthermore, as the conductive block wears, the elasticity of the spring-loaded contact spring and the contact spring maintains the contact between the conductive block and the welding wire, significantly improving stability and extending the service life. Theoretically, the conductive block only needs to be inspected and replaced when it can no longer maintain a tight seal with the welding wire. Current testing shows that this method reduces the conductive block replacement cycle to three times that of traditional contact nozzle replacements. Only the spring-loaded contact spring and the conductive block need to be replaced. Therefore, the equipment has a long continuous operating time and low cost, making it ideal for long-term use in automated equipment.

[0022] In addition, by adding a first contact and a second contact, the sliding displacement of the sleeve can be used to detect whether the spring or conductive block needs to be replaced. This enables intelligent detection, greatly facilitating maintenance and intelligent maintenance of the equipment, and is further applicable to automated and intelligent welding equipment. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of Embodiment 1;

[0024] Figure 2 This is a cross-sectional view of the plane at the center of the axis of welding wire 01 in Embodiment 1;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a cross-sectional view of Embodiment 1 located on another central plane where the axis of welding wire 01 is located;

[0027] Figure 5 This is a cross-sectional view of Embodiment 1 located at the center plane of the axis of the locking screw 550;

[0028] Figure 6 This is an exploded view of some parts from Example 1;

[0029] Figure 7 The explosion of the parts in Example 1 Figure 1 ;

[0030] Figure 8 The explosion of the parts in Example 1 Figure 2 ;

[0031] Figure 9 This is a schematic diagram of the structure after removing nozzle 130 in Example 1. Figure 1 ;

[0032] Figure 10 This is a schematic diagram of the structure after removing nozzle 130 in Example 1. Figure 2 ;

[0033] Figure 11 This is a schematic diagram of the structure after removing nozzle 130, sheath 710, and welding wire 01 in Embodiment 1;

[0034] Figure 12 This is a schematic diagram of the structure located at the conductive nozzle 310, conductive block 440, and spring piece 430 in Embodiment 1.

[0035] Figure 13 This is a cross-sectional view of the plane at the center of the axis of welding wire 01 in Example 2;

[0036] Figure 14 This is a schematic diagram of the structure after removing the nozzle 130, the connecting seat 110, and the welding wire 01 in Embodiment 2;

[0037] Figure 15 This is a schematic diagram of the structure located at the conductive nozzle 310 in Embodiment 2. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0039] Example 1

[0040] See Figures 1-12 The conductive nozzle device of this embodiment includes a connecting seat 110 and a conductive nozzle 310. The connecting seat 110 is mounted on the welding torch, thereby conducting electricity to the conductive nozzle 310 and providing protective gas. The connecting seat 110 is assembled with a nozzle 130. The nozzle 130 has a nozzle cavity 131 with a central hole on its inner side, and the nozzle cavity 131 is used to blow out protective gas.

[0041] The connecting seat 110 has a through connecting seat hole 111 inside, and a connecting part 120 is provided on one end of the connecting seat 110 that is inserted into the nozzle cavity 131. The connecting part 120 has a connecting screw hole 122 inside and an air outlet hole 121 on its side wall. The air outlet hole 121 is used to discharge the airflow sent from the connecting seat hole 111 into the nozzle cavity 131.

[0042] The conductive nozzle 310 is provided with a threaded portion 320, which is inserted into the connecting screw hole 122 and assembled with it by screwing. The inner side of the threaded portion 320 is provided with a transition hole 321 communicating with the connecting seat hole 111. The conductive nozzle 310 is provided with a conductive nozzle hole 311 communicating with the transition hole 321. The side wall of the conductive nozzle 310 is provided with a through notch 313. A sliding section 312 is provided at the corresponding position of the conductive nozzle 310 and the notch 313. A mounting seat 450 is installed or provided in the notch 313. The first screw 510 passes through the spring piece 430 and is assembled with the mounting seat 450 to install the spring piece 430 in the notch 313.

[0043] The spring sheet 430 is elastic and has an inclined section 431 that fits against the pressing inclined surface 421 of the pressing block 420. The pressing block 420 is mounted on the inner wall of the sliding sleeve 410. The end of the spring sheet 430 away from the mounting base 450 is assembled with the conductive block 440. The conductive block 440 has a conductive block groove 441, and the inner wall of the conductive block groove 441 is in close contact with the welding wire for conductivity. The mounting base 450, the spring sheet 430, and the conductive block 440 are all made of conductive material, thereby guiding the electricity from the conductive nozzle 310 to the conductive block 440, and then inputting the welding wire 01 from the conductive block 440. The spring sheet 430 applies a spring force to the conductive block 440 away from the welding wire 01, so that when the spring sheet 430 is not pressed by the pressing block 420, the conductive block 440 is in the position furthest from the conductive nozzle hole 311. The sliding sleeve 410 is axially slidably fitted onto the sliding section 312.

[0044] The sliding sleeve 410 is provided with a sliding sleeve ring 411, and the sliding sleeve ring 411 is provided with a first inner sleeve ring 412. The first inner sleeve ring 412 is assembled with one end of the spring 610. The spring 610 is fitted outside the conductive nozzle 310 and the other end is fitted on the second inner sleeve ring 141. The second inner sleeve ring 141 is provided on the rotating sleeve 140. The rotating sleeve 140 is rotatable but not axially movable and is fitted outside the connecting part 120.

[0045] An adjusting pin 530 is installed on the second inner ring 141. The adjusting pin 530 passes through the helical gap 611 of the spring 610, so that when the second inner ring 141 rotates, it can drive the spring 610 to contract or release relative to the axis of the rotating sleeve 140, thereby adjusting the elastic tension applied by the spring 610 to the first inner ring 412.

[0046] Preferably, the fixing screw 520 passes through the helical gap 611 of the spring 610 and is assembled with the first inner collar 412, thereby fixing the spring 610 on the first inner collar 412.

[0047] Preferably, a second retaining ring 220 and a first retaining ring 210 are respectively installed at the end of the second inner ring 141 and the end of the rotating sleeve 140 of the connecting portion 120. The ends of the second retaining ring 220 and the first retaining ring 210 are close to or pressed against the ends of the second inner ring 141 and the rotating sleeve 140, so that the second inner ring 141 and the rotating sleeve 140 cannot move axially relative to the connecting portion 120.

[0048] The first inner sleeve ring 412 and the sliding sleeve ring 411 are installed inside the sleeve cavity 711 of the sheath 710. The sheath 710 is fitted over the rotating sleeve 140. The second screw 540 passes through the sheath 710 and is assembled with the rotating sleeve 140, thereby fixing the sheath 710 to the rotating sleeve 140. The sheath 710 is rotatably fitted over the conductive nozzle 310.

[0049] The locking screw 550 passes through the sheath 710 and the rotating sleeve 140 and presses against the outer wall of the connecting part 120, thus preventing the sheath 710 and the rotating sleeve 140 from rotating relative to the connecting part 120, thereby ensuring the current state of the spring 610. To rotate the sheath 710 and the rotating sleeve 140, simply loosen the locking screw 550. The sheath 710 serves two purposes: firstly, it increases the contact area with the hand, facilitating rotation; secondly, it covers the spring to prevent foreign objects from entering, thereby reducing the failure rate.

[0050] The outer wall of the sliding sleeve 410 is also provided with an indicator groove 413 distributed along its axial direction. A scale 712 is provided on the end of the sheath 710 near the indicator groove 413. The scale 712, in conjunction with the indicator groove 413, indicates the rotation angle of the sheath 710, thereby calculating the axial retraction and retraction displacement of the spring 610 relative to the sheath 710. Combined with the physical parameters of the spring 610, the tension exerted by the spring 610 on the sliding sleeve 410 at this time can be calculated, facilitating adjustment of the tension by the operator. In practice, the tension of the spring on the sliding sleeve 410 can be continuously adjusted and tested through a limited number of experiments when different scales 712 correspond to the indicator groove 413, and then fed back to the scale. This allows for intuitive adjustment of the spring's tension on the sliding sleeve 410, making it more convenient to use. Of course, this is existing technology and will not be elaborated further in this case.

[0051] Preferably, the rotating sleeve 140 is further provided with a sliding block 460, which engages and slides into the notch 313. This design prevents the rotating sleeve 140 from rotating relative to the conductive nozzle 310, and closes the notch 313 to prevent foreign objects from entering and interfering with use.

[0052] Preferably, the outer wall of the sheath 710 is provided with a sheath protrusion 713, which is used to increase the friction when rotating the sheath 710, so as to facilitate the rotation of the sheath 710.

[0053] Figure 2 The demonstration shows the initial state, where the tension of the spring 610 on the sliding sleeve 410 is adjusted by rotating the sheath 710. The sliding sleeve 410 is pressed against the inclined section 431 by the pressing block 420, thereby pressing the conductive groove 441 against the outer wall of the welding wire 01. At this time, since the conductive block 440 is blocked by the welding wire and cannot continue to move towards the welding wire, the elastic force of the spring sheet acts directly on the conductive block 440 to ensure the conductive block 440 and the welding wire 01 are pressed together and conduct electricity.

[0054] As the conductive block wears down, the conductive block 440 can move towards the welding wire. At this time, the sliding sleeve 410, under the action of the spring 610, drives the pressing block 420 to move down, so that the conductive block 440 is still pressed against the welding wire. The conductive block 440 and the spring 430 need to be replaced when the conductive block 440 wears down to the point that it can no longer be pressed against the welding wire or the sliding sleeve 410 reaches its maximum displacement.

[0055] During replacement, remove the second screw 540 and the locking screw 550, then remove the protective sleeve 710, then remove the fixing screw 520, then remove the sliding sleeve 410, remove the first screw 510, then remove the conductive block 440 and the spring 430 as a whole, replace them with new conductive blocks 440 and springs 430, and then reassemble the entire device. After adjusting the spring tension by rotating the protective sleeve 710, tighten the locking screw 550 to prevent the protective sleeve 710 from rotating.

[0056] During use, the pressure between the conductive block and the welding wire varies, reaching its maximum initially. This is mainly due to the non-linear release of the spring force. However, this does not affect the use, as it is sufficient to ensure that the resistance (friction) experienced by the welding wire is within a preset range.

[0057] The design of this embodiment significantly reduces the replacement frequency of the conductive block compared to existing conductive nozzles, while also offering higher stability throughout use. As long as the conductive block is firmly pressed against the welding wire, issues such as arc backfire and arc breakage will not occur, making it highly suitable for use in automated equipment. Calculations show that the current replacement cycle for conductive nozzles is approximately 24 hours, while the replacement cycle for conductive blocks is over 80 hours. Furthermore, existing conductive nozzles are highly likely to experience arc backfire and arc breakage near their replacement cycle, while the 440 conductive block almost never exhibits these problems. Additionally, most existing conductive nozzles are made of copper, and after replacement, they are simply discarded as scrap. The conductive nozzle and conductive block in this embodiment can also be made of copper, but only the spring and conductive block are replaced, resulting in less wear and tear and lower operating costs. Undeniably, the labor cost of replacement in this embodiment is higher than that of directly replacing the conductive nozzle, but its longer service life and lower component wear costs mean that the overall maintenance cost is less than 80% of that of existing conductive nozzle replacement methods. Moreover, automated replacement equipment can be developed to replace manual labor, further reducing the overall cost.

[0058] Example 2

[0059] See Figures 13-15 The design of Embodiment 1 can only replace the conductive block 440 in a timely manner through periodic inspections. Its logic is similar to that of the existing conductive nozzle replacement. Therefore, it still suffers from problems such as increased labor costs and insufficient automation and intelligence. These issues affect the intelligent development of existing automated welding equipment. To address these issues, this embodiment makes the following improvements:

[0060] An insulating block 740 is installed within the notch 313. The insulating block 740 is made of an insulating material, such as insulating ceramic. A second contact 722 is installed on the insulating block 740, and the second contact 722 is connected to one end of the wire 730 for conduction. The sliding sleeve block 460 is made of a conductive material and engages and slides with the notch 313 to transmit the current of the conductive nozzle 310. A first contact 721 is installed on the sliding sleeve block 460. The first contact 721 is directly opposite the second contact 722, and the first contact 721 can be pressed tightly against the second contact 722 for conduction after it moves down.

[0061] The wire 730 is connected to the current detection device. Once the first contact 721 and the second contact 722 come into contact, the wire 730 becomes energized, thereby inputting a signal to the control device (such as an industrial computer, PLC, etc.). The control device determines that the conductive block needs to be replaced, and then prompts the staff through a preset prompt method (such as a software pop-up, notification, sound and light alarm, etc.).

[0062] Specifically, a safety resistor can be connected in series with the wire 730, and then connected to the other electrode that is electrically connected to the conductive nozzle. If the conductive nozzle is electrically connected to the positive terminal of the power supply, then the wire 730, after being connected in series with a safety resistor, is electrically connected to the negative terminal of the power supply; if the conductive nozzle is electrically connected to the live wire of the power supply, then the wire 730, after being connected in series with a safety resistor, is electrically connected to the negative terminal of the power supply. A current transformer is installed outside the wire 730. Initially, there is no current in the wire 730, and the current transformer cannot detect a signal. Once the first contact 721 and the second contact 722 make contact, causing the wire 730 to conduct electricity, the current transformer generates a signal and inputs it to the control device, which determines that the conductive block needs to be replaced, and thus prompts the staff through prompts (such as software pop-ups, notifications, audible and visual alarms, etc.).

[0063] This design ensures that the high heat at the conductive nozzle does not affect its use, while also allowing the first contact 721 and the second contact 722 to make contact and conduct electricity for detection through the displacement of the sliding sleeve. Its structure and technical principle are simple and mature, and the detection accuracy and speed are relatively fast. At the same time, it can be automated to meet the needs of automated welding equipment.

[0064] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0065] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A contact tip device with an external elastic compensation structure, characterized in that: The device includes a connector and a conductive nozzle. The connector has a through-hole and a connecting part on one end of the connector that is inserted into the nozzle cavity. The conductive nozzle has a threaded part that is inserted into and assembled with a connecting screw hole. The conductive nozzle has a conductive nozzle hole and a through-hole on the side wall of the conductive nozzle. A spring sheet is installed in the notch. The spring sheet is elastic and has an inclined section. The inclined section fits into the pressing slope of the pressing block. The pressing block is installed on the inner wall of the sliding sleeve. The end of the spring sheet away from the mounting seat is assembled with the conductive block. The conductive block is pressed and conductive with the welding wire. The sliding sleeve is assembled with one end of the spring, and the other end of the spring is directly or indirectly assembled with the connecting seat.

2. The electrically conductive tip device of claim 1, wherein: A sliding section is provided at the location where the conductive nozzle corresponds to the notch, and the sliding sleeve is fitted outside the sliding section.

3. The electrically conductive tip assembly of claim 1, wherein: A mounting base is installed or provided in the notch, and the spring is assembled with the mounting base. The spring is installed in the notch.

4. The electrically conductive tip assembly of claim 1, wherein: The conductive block is provided with a conductive block groove, and the inner wall of the conductive block groove is in close contact with the welding wire for conduction.

5. The electrically conductive tip assembly of any of claims 1-4, wherein: The sliding sleeve is provided with a sliding sleeve ring, and the sliding sleeve ring is provided with a first inner sleeve ring. The first inner sleeve ring is assembled with one end of the spring. The spring is fitted outside the conductive nozzle and the other end is fitted on the second inner sleeve ring. The second inner sleeve ring is provided on the rotating sleeve, and the rotating sleeve is fitted outside the connecting part. An adjusting pin is installed on the second inner sleeve ring, and the adjusting pin passes through the helical gap of the spring.

6. The electrically conductive tip assembly of claim 5, wherein: The first inner sleeve ring and the sliding sleeve ring are installed into the sleeve cavity of the sheath, and the sheath is fitted outside the rotating sleeve and is matched with the rotating sleeve; The outer wall of the sliding sleeve is provided with indicator grooves distributed along its axial direction, and the end of the protective sleeve near the indicator groove is provided with a scale, which cooperates with the indicator groove.

7. The electrically conductive tip assembly of claim 6, wherein: After the locking screw passes through the sheath and the rotating sleeve, it presses against the outer wall of the connecting part, thus preventing the sheath and the rotating sleeve from rotating relative to the connecting part.

8. The electrically conductive tip assembly of any of claims 1-4, 6-7, wherein: The connecting part is equipped with a second retaining ring and a first retaining ring at the end of the second inner ring and the end of the rotating sleeve, respectively. The ends of the second retaining ring and the first retaining ring are close to or close to the end of the second inner ring and the end of the rotating sleeve, respectively.

9. The conductive tip device according to claim 6 or 7, characterized in that: in An insulating block is installed inside the slot. The insulating block is made of insulating material and has a second contact installed on it. The second contact is connected to one end of a wire for conduction. The rotating sleeve is also provided with a sliding block, which is made of conductive material and engages with the notch and slides to transmit the current of the conductive nozzle; a first contact is installed on the sliding block, the first contact is directly opposite the second contact, and the first contact can be pressed tightly with the second contact to conduct electricity after it moves down; The wire is connected to the current detection device. When the first contact and the second contact come into contact, the wire becomes energized. The current detection device detects that the wire is energized and then inputs a signal to the control device.

10. A welding torch characterized by: It includes the conductive nozzle device according to any one of claims 1-9.

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