Valve welding auxiliary device

Abstract

The invention relates to the technical field of valve welding, in particular to a valve welding auxiliary device which is used for assisting welding of a valve body and a flange and comprises a rack, a chuck, a rotating motor, a three-axis moving platform, a supporting frame, a sliding rod, a sliding ring, an upper clamping jaw and a supporting column. The supporting frame is connected to the three-axis moving platform, the sliding rod is rotationally connected to the supporting frame, the sliding ring is arranged on the sliding rod in a sleeving mode, the multiple upper clamping jaws are arranged on the supporting frame in a circumferential array mode, the supporting column is connected to the chuck, and the upper end of the supporting column and the lower end of the sliding rod are axially connected and circumferentially interlocked. The supporting column coaxial with the chuck is arranged to serve as the positioning reference, the upper clamping jaw mechanism and the lower clamping jaw mechanism are made to center the flange and the valve body with the supporting column serving as the reference, the aim of improving the centering precision of the valve body and the flange is achieved, and then the welding quality of the valve body and the flange is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve welding, in particular to a valve welding auxiliary device. BACKGROUND

[0002] In the valve manufacturing process, the valve body and the flange are usually welded, and the welding quality directly affects the sealing performance and service life of the valve. At present, the welding operation depends on the experience of workers: the workers usually first position the valve body with a chuck, then place the flange at the opening of the valve body, and then use a V-shaped iron, a pressing plate or a point welding method to complete the temporary fixing of the flange on the valve body, and finally complete the welding between the valve body and the flange.

[0003] However, in the welding process, in order to ensure the root penetration, there is usually an assembly gap between the flange and the valve body. The simple positioning by the above-mentioned method cannot guarantee the coaxiality of the valve body and the flange, which leads to uneven assembly gap at different places, and thus causes stress concentration after welding, which induces welding quality problems.

[0004] Therefore, a valve welding auxiliary device is provided. SUMMARY

[0005] The purpose of the present application is to provide a valve welding auxiliary device, which solves the problem of poor centering accuracy caused by manual positioning during welding of the valve body and the flange. The present application sets a support column coaxial with the chuck as a positioning reference, and makes the upper and lower jaw mechanisms center the flange and the valve body respectively based on this reference, thereby achieving the purpose of improving the centering accuracy of the valve body and the flange, and further ensuring the welding quality of the valve body and the flange.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A valve welding auxiliary device for assisting the welding of a valve body and a flange, comprising a rack, a chuck and a rotary motor, the chuck being rotatably connected to the rack, further comprising a three-axis moving platform, a support frame, a slide rod, a slide ring, an upper jaw and a support column, the three-axis moving platform being connected to the rack, the support frame being connected to the three-axis moving platform, the slide rod being rotatably connected to the support frame, the slide ring being sleeved on the slide rod, a plurality of upper jaws being circumferentially arrayed on the support frame, the upper ends of the upper jaws being in contact with the slide ring, the support column being connected to the chuck, the support column being coaxial with the chuck, the lower end of the support column being connected to the output shaft of the rotary motor, the upper end of the support column being axially connected to the lower end of the slide rod and circumferentially interlocked with the lower end of the slide rod.

[0008] The support column guides the valve body to fall on the chuck, and the slide ring sliding on the slide rod drives the upper ends of the upper jaws to expand outward and the lower ends of the upper jaws to contract inward.

[0009] Preferably, the support column is arranged as a hollow tube structure, and the upper end of the support column is provided with a spline groove, and the lower end of the slide rod is provided with a spline boss which is engaged with the spline groove;

[0010] In the above scheme, the support column is arranged as a hollow tube, which has the following advantages: 1) reducing the manufacturing cost of the auxiliary device; 2) reducing the self-weight, reducing the energy consumption of the rotary motor, and reducing the operation cost of the auxiliary device; 3) compared with a solid tube, the boring or drilling process during spline groove machining is avoided, making the manufacturing more efficient; 4) and arranging the spline groove at the upper end of the support column can also enable the operator to observe along the direction from the spline boss to the spline groove (i.e. from top to bottom) when butting the support column and the slide rod, without needing to bend down to observe from the bottom, thereby making the butting process of the support column and the slide rod more efficient and safer.

[0011] Preferably, the slide rod is arranged with threads, and the slide ring is arranged with threads inside, and the threads of the slide ring are engaged with the threads of the slide rod.

[0012] The inner channel of the valve body participates in specific work, so its inner surface is smoother and more regular than the outer surface, and is more suitable as a positioning reference surface;

[0013] Preferably, the chuck includes a disc body and a plurality of lower clamping jaws, the disc body is rotationally connected to the rack, the plurality of lower clamping jaws are circumferentially arranged on the disc body, and the lower clamping jaws slide along the radial direction of the disc body, the lower clamping jaws are arranged as a multi-prism structure, and the diameter of the disc body along the sliding direction of the lower clamping jaws is coplanar with the outermost edge of the lower clamping jaws.

[0014] In the above scheme, the lower clamping jaws slide outward from the inside to tighten and position the inner wall of the valve body, thereby improving the positioning accuracy of the valve body.

[0015] Preferably, a positioning column is hinged to the lower clamping jaw, and the upper end of the positioning column abuts against the support column.

[0016] In the above scheme, the combination of the positioning column, the lower clamping jaw and the support column forms a conical structure to guide the valve body to fall onto the chuck, and the bottom area of the conical structure increases as the lower clamping jaw moves outward (when the inner diameter of the valve body increases, the lower clamping jaw needs to move outward correspondingly), thereby reducing the adjustment range during the centering process after the valve body falls onto the disc body, and reducing the surface wear of the valve body and the disc body.

[0017] Preferably, the upper clamping jaw includes a transition jaw and a force applying jaw, the force applying jaw is hinged to the support frame, and the two ends of the transition jaw are respectively hinged to the force applying jaw and the slide ring.

[0018] In the above scheme, the slide ring, the transition jaw and the force applying jaw form a group of clamping jaws, and through the lifting of the slide ring on the slide rod, the lower ends of the multiple groups of clamping jaws are simultaneously retracted inward or expanded outward, thereby realizing the clamping or loosening of the upper flange of the valve body.

[0019] Preferably, the distance from the hinge point of the force applying claw and the support frame to the lower end of the force applying claw is less than the distance to the upper end of the force applying claw;

[0020] In the above scheme, the force applying claw becomes a lever structure through the hinge with the support frame, and further, the distance from the hinge point of the force applying claw and the support frame to the lower end of the force applying claw is less than the distance to the upper end of the force applying claw, so that the power arm of the transition claw to the force applying claw is greater than the resistance arm of the flange to the force applying claw, and the process of driving the slip ring by the plurality of force applying claws is more labor-saving.

[0021] Preferably, the plurality of transition claws are internally provided with pressure sensors, and the installation positions of the plurality of pressure sensors are the same;

[0022] In the above scheme, the pressure sensors arranged at the same position of the plurality of transition claws detect the centering state of the flange.

[0023] Preferably, the three-axis moving platform comprises a vertical arm and a horizontal arm, the vertical arm is slidingly connected to the rack, the horizontal arm is slidingly connected to the vertical arm, and the support frame is slidingly connected to the horizontal arm;

[0024] In the above scheme, the vertical arm slides on the rack in the up-down direction, the horizontal arm slides on the vertical arm in the front-rear direction, and the support frame slides on the horizontal arm in the left-right direction, so that the position of the slide rod can be always centered with the support frame through the movement of the three-axis, thereby ensuring the centering accuracy of the flange and the valve body.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1. The valve welding auxiliary device provided by the present application ensures the coaxiality of the valve body and the flange before welding by setting the support column coaxial with the rotary chuck and centering and clamping the valve body and the flange with the lower clamping jaw and the upper clamping jaw as the reference of the support column, thereby ensuring the uniform assembly gap between the valve body and the flange, effectively avoiding the welding stress concentration problem caused by insufficient manual positioning accuracy, and significantly improving the welding quality and yield of the valve.

[0027] 2. The present application sets the support column coaxial with the chuck to form the positioning reference axis of the entire device; the lower clamping jaw is opened from inside to outside to position the valve body, thereby ensuring the coaxiality of the valve body and the support column, and guiding the valve body by means of the "lower clamping jaw, positioning column, support column" combination to reduce the adjustment range when positioning the valve body, thereby reducing the wear of the disc body and the valve body; in addition, the slide rod is connected with the support column through the spline connection, thereby inheriting the position of the reference axis, and then driving the upper clamping jaw to clamp the flange through the slip ring on the slide rod, so that the flange is also coaxial with the reference axis, thereby realizing the centering of the flange and the valve body.

[0028] 3、The present application not only guarantees the centering accuracy in structure, but also realizes flexible adjustment and real-time monitoring of the centering process through the three-axis moving platform and the pressure sensor, the three-axis moving platform can quickly coarsely adjust the upper clamping jaw mechanism before welding to adapt to valves of different specifications and ensure that the slide rod can be smoothly connected with the support post; and in the clamping process, the pressure sensor arranged on the plurality of transition claws can monitor the stress uniformity of the flange in real time, thereby providing objective data basis for the operator to judge whether the flange is completely centered, realizing the upgrading from "mechanical centering" to "precise centering under intelligent monitoring", and further ensuring the reliability of the final centering effect and welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole isometric structural schematic diagram of the present application;

[0030] Figure 2 It is an internal cross-sectional isometric structural schematic diagram of the present application;

[0031] Figure 3 It is a Figure 2 enlarged schematic diagram of part A of the present application;

[0032] Figure 4 It is a Figure 2 enlarged schematic diagram of part B of the present application;

[0033] Figure 5 It is a valve body installation state schematic diagram of the present application;

[0034] Figure 6 It is a slide rod and support post docking state schematic diagram of the present application;

[0035] Figure 7 It is a flange centering state schematic diagram of the present application;

[0036] Figure 8 It is a flange centering state schematic diagram of the present application;

[0037] In the figure: 1, rack; 2, chuck; 21, disc body; 22, lower clamping jaw; 23, positioning column; 3, rotary motor; 4, three-axis moving platform; 41, vertical arm; 42, horizontal arm; 5, support frame; 6, slide rod; 61, spline boss; 7, slip ring; 8, upper clamping jaw; 81, transition claw; 82, force applying claw; 9, support post; 91, spline groove; 10, pressure sensor; 11, valve body; 12, flange. DETAILED DESCRIPTION

[0038] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0039] Please refer to Figures 1 to 8 The present application provides a valve welding auxiliary device, and the technical solutions are as follows:

[0040] A valve welding auxiliary device is used for assisting welding of a valve body 11 and a flange 12, comprising a rack 1, a chuck 2, a rotary motor 3, a three-axis moving platform 4, a support frame 5, a slide rod 6, a slide ring 7, upper clamping jaws 8 and a support column 9. The chuck 2 is rotatably connected to the rack 1 through bearings. The three-axis moving platform 4 is connected to the rack 1. The support frame 5 is connected to the three-axis moving platform 4. The slide rod 6 is rotatably connected to the support frame 5 through a set of bearings arranged vertically. The lower end of the slide rod 6 extends out of the support frame 5. The slide ring 7 is sleeved on the slide rod 6. The upper clamping jaws 8 are hingedly connected to the support frame 5 and are arranged at equal angles. In this mode, the number of the upper clamping jaws 8 is three, so the included angle between adjacent upper clamping jaws 8 is 120°. The upper ends of the upper clamping jaws 8 are in contact with the slide ring 7. The lower end of the support column 9 penetrates the chuck 2, and directional bearings are installed between the support column 9 and the chuck 2. The rotary motor 3 is fixed below the rack 1. The output shaft of the rotary motor 3 is connected to the lower end of the support column 9 through a shaft coupling. The support column 9 is coaxial with the chuck 2. The upper end of the support column 9 is axially inserted into the lower end of the slide rod 6 and is circumferentially locked.

[0041] The support column 9 guides the valve body 11 to fall on the chuck 2. The slide ring 7 sliding on the slide rod 6 drives the upper ends of the upper clamping jaws 8 to expand outward, so that the lower ends of the upper clamping jaws 8 shrink inward, thereby centering the flange 12 between the multiple lower clamping jaws 22 and the valve body 11.

[0042] As an embodiment of the present application, referring to Figures 1 to 3 The chuck 2 comprises a disc body 21 and lower clamping jaws 22. The disc body 21 is rotatably connected to the rack 1. The lower clamping jaws 22 are circumferentially arranged on the disc body 21 and slide along the radial direction of the disc body 21. The lower clamping jaws 22 are arranged in a multi-prism structure.

[0043] The chuck 2 is a fixture commonly used in valve welding process to clamp the valve body 11, and the chuck 2 usually has a set of meshing bevel gears inside, the end face of the large bevel gear is provided with a helical groove, and the lower clamping jaw 22 is mounted on the helical groove, and the small bevel gear is movably connected with the external wrench; when the operator inserts the wrench into the disc body 21 to connect the small bevel gear, the power can be transmitted to the lower clamping jaw 22 connected with the helical groove through the bevel gear set by rotating the wrench, thereby driving the three lower clamping jaws 22 to simultaneously shrink or expand; in this mode, considering that the smooth and regular inner surface of the valve body 11 is more suitable as a positioning reference surface, the valve body 11 is positioned in an inner clamping mode, and the specific mode is that the diameter of the disc body 21 in the same sliding direction as the lower clamping jaw 22 (referring to the dashed line segment in Figure 3 ) is coplanar with the outermost edge of the lower clamping jaw 22 (in this mode, the coplanar of the front lower clamping jaw 22 and the diameter of the disc body 21 is the cross section in the front-rear direction in Figure 3 ).

[0044] As an embodiment of the present application, referring to Figure 3 and Figure 5 , the lower clamping jaw 22 is hinged with a positioning column 23, and the upper end of the positioning column 23 is tightly attached to the support column 9;

[0045] Before installing the valve body 11, the opening inner diameter of the valve body 11 is determined, and then the positioning diameter of the lower clamping jaw 22 is adjusted to be smaller than the inner diameter of the valve body 11 by about 10 mm through the above mode, then the valve body 11 is sleeved into the support column 9 and slides downward along the positioning column 23 tightly attached to the support column 9 (referring to Figure 5 ), until the lower bottom surface of the valve body 11 is in full contact with the disc body 21, and finally the lower clamping jaw 22 is continuously adjusted to expand the plurality of lower clamping jaws 22 to center the valve body 11 with the support column 9, during which the positioning column 23 will rub against the peripheral surface of the support column 9, so the interfacing surface between the positioning column 23 and the support column 9 and the peripheral surface of the support column 9 are both subjected to friction resistance treatment.

[0046] As an embodiment of the present application, referring to Figure 1 and Figure 2 , the three-axis moving platform 4 includes a longitudinal arm 41 and a transverse arm 42, the longitudinal arm 41 is slidingly connected to the rack 1, the transverse arm 42 is slidingly connected to the longitudinal arm 41, and the support frame 5 is slidingly connected to the transverse arm 42;

[0047] The slider is arranged at the rear side of the longitudinal arm 41, and the corresponding slide rail is arranged at the front side of the rack 1 in the up-down direction, and then the longitudinal arm 41 is slided along the up-down direction of the rack 1 through the cooperation of the slider and the slide rail, and the lead screw is arranged through the longitudinal arm 41 on the rack 1, and the motor is connected at one end of the lead screw, so as to provide power for the up-down sliding of the longitudinal arm 41; similarly, the same arrangement is carried out between the longitudinal arm 41 and the horizontal arm 42, and between the horizontal arm 42 and the support frame 5, so as to realize the sliding of the slide rod 6 along the front-rear and left-right directions respectively, so as to ensure the smooth butt joint of the slide rod 6 and the support column 9, and then the coaxiality of the flange 12 and the valve body 11 is ensured, and the difference from the adjustment along the up-down direction is that the probability of the left-right or front-rear deviation of the slide rod 6 is very low (such as the uneven influence of the environmental conditions such as working temperature on the material will cause the deviation phenomenon), and the deviation range is also very small, so as to ensure the accuracy of the adjustment of the slide rod 6 along the front-rear and left-right directions, and the hand wheel is assembled on the lead screw penetrating through the horizontal plate and the support frame 5, and the manual fine adjustment is carried out by the operator.

[0048] As one embodiment of the present application, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 6 , the support column 9 is arranged as a hollow pipe structure, and the upper end of the support column 9 is provided with the spline groove 91, and the lower end of the slide rod 6 is provided with the spline boss 61, and the spline boss 61 is embedded with the spline groove 91;

[0049] Through the longitudinal arm 41 driving the slide rod 6 to continuously descend, when the slide rod 6 descends to the set height (that is, the lower end surface of the slide rod 6 and the upper end surface of the support column 9 are about to be the same), the slide rod 6 stops descending, the operator drives the slide rod 6, and focuses the eyes on the upper side of the spline groove 91, so as to align the spline boss 61 with the spline groove 91, and then the longitudinal arm 41 drives the slide rod 6 to continue to descend by a suitable distance (the so-called suitable distance is determined according to the diameter of the flange 12 during the welding operation, and the greater the diameter of the flange 12, the smaller the value of the suitable distance), so as to make the support column 9 and the slide rod 6 circumferentially interlocked, and make the upper clamping jaw 8 and the flange 12 have a gap of at least 5mm; the surface of the spline boss 61 and the spline groove 91 is subjected to friction resistance treatment (such as tungsten carbide treatment), so as to reduce the wear during the frequent plugging of the spline boss 61 and the spline groove 91, so as to ensure the coaxiality of the support column 9 and the slide rod 6, so as to ensure the centering of the flange 12 and the valve body 11; in order to further ensure the coaxiality of the flange 12 and the valve body 11, the spline boss 61 and the spline groove 91 are preferably connected by involute spline, and the centering mode is the addendum centering, and the matching accuracy is not less than the 5th accuracy in GB / T 3478.1-1995 standard, through the high-precision matching, the radial runout and the rotary clearance after the butt joint of the slide rod 6 and the support column 9 are less than 0.05mm, so as to accurately transfer the positioning reference from the support column 9 to the slide rod 6.

[0050] As one embodiment of the present application, refer toFigures 3 to 5 The upper jaw 8 includes a transition jaw 81 and a force-applying jaw 82. The force-applying jaw 82 is hinged to the support frame 5. The two ends of the transition jaw 81 are hinged to the force-applying jaw 82 and the slip ring 7, respectively. The distance from the hinge point of the force-applying jaw 82 to the lower end of the support frame 5 is denoted as L1, and the distance from the hinge point of the force-applying jaw 82 to the upper end of the support frame 5 is denoted as L2. In order to balance sufficient clamping force and reasonable slip ring 7 stroke, the ratio of L2 to L1 is preferably in the range of 1.5:1 to 4:1. For small and medium-sized valves, a ratio of 2:1 is preferred. For large and heavy valves, a larger leverage ratio (e.g., 3:1) can be used to obtain a larger clamping force. This leverage ratio can be adapted to different working conditions by changing the force-applying jaw 82 or the support frame 5 with different hinge hole positions. In this method, L2 is twice the value of L1.

[0051] When installing the chuck 8, follow the instructions. Figure 5 The installation is carried out in such a way that when the slip ring 7 is below the slide rod 6, the hinge point of the transition claw 81 and the force-applying claw 82 is above the slip ring 7 and close to the slide rod 6. Then, when the slip ring 7 moves up along the slide rod 6, the upper end of the force-applying claw 82 is pushed outward by the transition claw 81, while the lower end of the force-applying claw 82 retracts inward to clamp the flange 12 and align the flange 12 with the valve body 11.

[0052] As one embodiment of the present invention, refer to Figure 1 and Figure 2 The slide rod 6 is threaded, and the slip ring 7 is threaded inside, and the thread of the slip ring 7 meshes with the thread of the slide rod 6. In this method, the threads on the slide rod 6 and the slip ring 7 are both set to right-hand, and the directional bearing between the support column 9 and the disc 21 is allowed to rotate in the direction of relative right-hand rotation of the inner ring. After the slide rod 6 and the support column 9 are inserted, when the rotary motor 3 rotates to the right, it drives the support column 9 to rotate independently, so that the slip ring 7 rises along the slide rod 6, thereby clamping the flange 12 with the force-applying claw 82.

[0053] As one embodiment of the present invention, refer to Figures 4 to 8 Each of the multiple transition claws 81 is equipped with a pressure sensor 10, and the multiple pressure sensors 10 are installed in the same position.

[0054] In this mode, the three pressure sensors 10 are connected to the PLC system, and the specific working principle is as follows: after the valve body 11 is positioned on the disc 21 according to the above mode, the operator places the flange 12 on the boss above the valve body 11, at this time the gap (i.e. the welding gap) between the inner wall of the flange 12 and the outer wall of the upper end of the valve body 11 cannot be guaranteed to be uniform, that is, the centering of the flange 12 and the valve body 11 cannot be guaranteed, so the lower ends of the three force claws 82 are synchronously retracted to gradually center the flange 12 with the valve body 11, when the contact state of the force claws 82 and the flange 12 is the same, the flange 12 completes the centering with the valve body 11, at this time, the PLC system will monitor that the readings of the three pressure sensors 10 all reach the preset clamping force range, and the difference between any two readings is less than the preset threshold, then it is judged that the flange 12 has been centered and clamped, and a stop command is issued to stop the tightening of the lower ends of the force claws 82 and keep the state (refer to Figure 7 ), thereafter, the flange 12 and the valve body 11 are manually spot welded to form a preliminary fixation, then the rotary motor 3 rotates left to drive the sliding ring 7 to descend along the slide rod 6, thereby causing the lower ends of the force claws 82 to expand outward (refer to Figure 8 ), then the vertical arm 41 drives the slide rod 6 to rise to leave a welding space (restore Figure 5 the state in the middle), and finally the welding operator or automatic equipment completes the welding.

[0055] Working principle: In order to solve the problem of poor centering accuracy caused by manual positioning when welding the valve body 11 and the flange 12 in the prior art, the present application realizes automatic and high-precision centering of the valve body 11 and the flange 12 through a coaxial positioning mechanism taking the support 9 as a reference. The specific mode is: a support 9 is arranged at a position coaxial with the rotary chuck 2 as a positioning reference, the lower claw 22 is tightened outward with the support 9 as the center, thereby pushing the inner wall of the valve body 11 to center the valve body 11 with the support 9; at the same time, the upper claw mechanism drives the upper claw 8 to clamp the flange 12 through the slide rod 6 and the coaxial butt joint with the support 9. In this way, the valve body 11 and the flange 12 are positioned with the same support 9 as a reference, which fundamentally guarantees the coaxiality of the two and ensures the uniformity of the assembly gap, laying a foundation for high-quality welding.

[0056] In order to conveniently place the valve body 11 on the chuck 2 and realize accurate preliminary positioning in actual operation, the specific mode is: a positioning column 23 is hinged on the lower claw 22, the upper end of the positioning column 23 closely abuts against the support 9 coaxial with the chuck 2, when the worker lifts the valve body 11 (the valve body 11 is lifted so that the end face of the welding port is parallel to the end face of the chuck 2), this conical guide structure composed of the support 9, the positioning column 23 and the lower claw 22 can guide the valve body 11 to smoothly fall down and roughly center it (refer to Figure 5), then the lower clamping jaw 22 slides outward along the radial direction of the disc body 21, and the lower clamping jaw 22 is tightened by using the more regular and smooth inner passage of the valve body 11 as a positioning reference surface, thereby fixing the valve body 11 on the chuck 2 with high precision and making the axis of the valve body 11 coincide with the axis of the support 9;

[0057] In order to accurately center the flange 12 to be welded with the positioned valve body 11, the specific manner is as follows: first, the upper clamping assembly including the support 5, the slide rod 6, the slide ring 7, the upper clamping jaw 8, etc. on the support 5 is adjusted to be directly above the support 9 by moving the three-axis moving platform 4 (including the longitudinal arm 41 and the transverse arm 42), then the upper clamping assembly is lowered, and the spline boss 61 at the lower end of the slide rod 6 is embedded in the spline groove 91 in the hollow pipe at the upper end of the support 9 (see Figure 6 ), this spline connection not only ensures that the axis of the slide rod 6 coincides with the axis of the support 9, achieving the upward transmission of the positioning reference, but also enables the subsequent rotation of the support 9 to drive the synchronous rotation of the upper mechanism;

[0058] In order to realize the clamping and loosening of the flange 12 and ensure that the clamping process is labor-saving and the clamping state is controllable, the specific manner is as follows: after the slide rod 6 is connected with the support 9, the slide rod 6 is rotated by the rotating motor 3, and since the slide rod 6 is threadedly engaged with the slide ring 7, the rotation of the slide rod 6 drives the slide ring 7 to move up and down along the axial direction, the slide ring 7 pushes the upper end of the force applying jaw 82 through the hinged transition jaw 81, and since the hinge point between the force applying jaw 82 and the support 5 is designed as a labor-saving lever (the power arm is greater than the resistance arm), a small displacement and pushing force of the slide ring 7 can drive the lower end of the force applying jaw 82 to produce a powerful inward or outward action, thereby realizing the clamping or loosening of the flange 12 (see Figure 7 , in which the slide ring 7 moves upward to make the lower end of the force applying jaw 82 inwardly retract, and see Figure 8 , in which the slide ring 7 moves downward to make the lower end of the force applying jaw 82 outwardly expand), in addition, in order to monitor the centering effect in real time, pressure sensors 10 are arranged at the same positions of the multiple transition jaws 81, and the operator can compare the readings of the sensors to determine whether the flange 12 is uniformly stressed and whether it has been completely centered, thereby achieving closed-loop monitoring and adjustment of the centering process.

[0059] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A valve welding auxiliary device for assisting in the welding of a valve body (11) and a flange (12), comprising a frame (1), a chuck (2), and a rotary motor (3), wherein the chuck (2) is rotatably connected to the frame (1), characterized in that: It also includes a three-axis moving platform (4), a support frame (5), a slide rod (6), a slip ring (7), an upper chuck (8), and a support column (9). The three-axis moving platform (4) is connected to the frame (1). The support frame (5) is connected to the three-axis moving platform (4). The slide rod (6) is rotatably connected to the support frame (5). The slip ring (7) is sleeved on the slide rod (6). Multiple upper chucks (8) are arranged in a circular array on the support frame (5), and the upper end of the upper chuck (8) contacts the slip ring (7). The support column (9) is connected to the chuck (2), and the support column (9) is coaxial with the chuck (2). The lower end of the support column (9) is connected to the output shaft of the rotary motor (3). The upper end of the support column (9) is axially connected to the lower end of the slide rod (6) and circumferentially interlocked. The support (9) guides the valve body (11) to fall on the chuck (2), and the slip ring (7) sliding on the slide rod (6) drives the upper end of the upper jaw (8) to expand outward and the lower end of the upper jaw (8) to retract inward.

2. The valve welding auxiliary device according to claim 1, characterized in that: The support column (9) is configured as a hollow tube structure, and the upper end of the support column (9) is provided with a spline groove (91), and the lower end of the slide rod (6) is provided with a spline boss (61), which is fitted into the spline groove (91).

3. The valve welding auxiliary device according to claim 2, characterized in that: The slide rod (6) is threaded, the slip ring (7) is threaded inside, and the thread of the slip ring (7) meshes with the thread of the slide rod (6).

4. The valve welding auxiliary device according to claim 1, characterized in that: The chuck (2) includes a disc body (21) and lower jaws (22). The disc body (21) is rotatably connected to the frame (1). A plurality of lower jaws (22) are arranged in a circumferential array on the disc body (21), and the lower jaws (22) slide radially along the disc body (21). The lower jaws (22) are configured as a polyprism structure. The diameter of the disc body (21) is coplanar with the outermost edge of the lower jaws (22) in the same sliding direction as the lower jaws (22).

5. The valve welding auxiliary device according to claim 4, characterized in that: A positioning post (23) is hinged to the lower jaw (22), and the upper end of the positioning post (23) is in close contact with the support column (9).

6. The valve welding auxiliary device according to claim 1, characterized in that: The upper jaw (8) includes a transition jaw (81) and a force-applying jaw (82). The force-applying jaw (82) is hinged to the support frame (5). The two ends of the transition jaw (81) are respectively hinged to the force-applying jaw (82) and the slip ring (7).

7. A valve welding auxiliary device according to claim 6, characterized in that: The distance from the hinge point of the force-applying claw (82) and the support (5) to the lower end of the force-applying claw (82) is less than the distance to the upper end of the force-applying claw (82).

8. The valve welding auxiliary device according to claim 7, characterized in that: Each of the multiple transition claws (81) is equipped with a pressure sensor (10), and the multiple pressure sensors (10) are installed in the same position.

9. A valve welding auxiliary device according to claim 1, characterized in that: The three-axis moving platform (4) includes a longitudinal arm (41) and a transverse arm (42). The longitudinal arm (41) is slidably connected to the frame (1), the transverse arm (42) is slidably connected to the longitudinal arm (41), and the support frame (5) is slidably connected to the transverse arm (42).

Images