Stainless steel pressure gauge shell clamping device

Abstract

The utility model relates to the technical field of clamping equipment, and provides a stainless steel pressure gauge shell clamping device which comprises a fixed platform, a rotating mechanism and a positioning and clamping mechanism. The rotating mechanism comprises a fixed rotating frame, a servo motor, a transmission gear box and a three-jaw chuck; the fixed rotating frame is mounted on the fixed platform; arc-shaped grooves are formed in the two side walls of the fixed rotating frame; the transmission gear box is connected with the fixed rotating frame in a hinged mode, and the two ends of the transmission gear box penetrate through the arc-shaped grooves. The input end of the transmission gear box is connected with the servo motor, and the output end of the transmission gear box is connected with the three-jaw chuck; and the three-jaw chuck clamps and positions the clamping mechanism. According to the utility model, clamping fixation and rotary automatic positioning of the housing and the joint of the stainless steel pressure gauge during laser welding can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of clamping equipment, in particular to a clamping device for a stainless steel pressure gauge shell. Background Art

[0002] Stainless steel pressure gauges are widely used in industries such as petroleum, chemical, chemical fiber, wastewater treatment, power plants, and food to measure the pressure of various fluids in processes requiring high corrosion and high-temperature resistance. The pressure gauge uses the elastic deformation of its stainless steel sensitive elements (Bourdon tube, diaphragm, and bellows) to transmit this elastic deformation to the pointer through a conversion mechanism within the gauge movement, causing the pointer to rotate and display pressure. The pressure gauge is fully sealed, with the interior of the gauge housing connected to the outside world only through joints. This provides strong resistance to corrosion from the measured medium and the environment, with an IP66 protection rating.

[0003] The sealing performance of a stainless steel pressure gauge is the key to evaluating its important indicators such as pressure resistance, high temperature resistance, and corrosion resistance. The connection between the stainless steel pressure gauge housing and the joint is particularly important. Both the housing and the joint are made of 304 stainless steel or 316 stainless steel. Welding is the most common and effective method of connection, which can meet the requirements of good sealing and pressure strength. Laser welding, as an efficient and precise welding method that uses a high-energy-density laser beam as a heat source, is one of the important aspects of the application of laser material processing technology. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts. Laser welding combined with CNC technology and equipped with a multi-axis linkage laser welding machine has long been used in engineering production.

[0004] When laser welding the shell and the joint, the shell and the joint boss are fixed. The operator first fixes the circular shell with the shell clamp, then holds the joint and puts it into the square groove on the side of the shell clamp, and then welds the four sides of the square where the shell and the joint boss meet. The manual clamping operation leads to inaccurate positioning of the shell, resulting in a low product qualification rate. In addition, the joint is not equipped with a positioning limit structure, and the fixing effect of the joint is not good. When flipping is required, it is difficult to control the relative stability of the shell and the joint boss when the circular shell rotates along the axis of the joint, which easily causes the relative position to change, the flipping speed is slow, and the precise flipping angle of 90° each time cannot be accurately controlled. In addition, a corresponding set of clamps is required for shells of different diameters, and the clamps have poor adaptability and high cost. Utility Model Content

[0005] The utility model mainly solves the technical problems in the prior art that manual clamping operation during laser welding of the shell and the joint leads to inaccurate positioning of the shell, resulting in low product qualification rate, poor adaptability of the fixture and high cost. A stainless steel pressure gauge shell clamping device is proposed to achieve clamping, fixation and automatic rotation positioning of the shell and the joint of the stainless steel pressure gauge during laser welding.

[0006] The utility model provides a stainless steel pressure gauge housing clamping device, comprising: a fixed platform, a rotating mechanism and a positioning clamping mechanism;

[0007] The rotating mechanism includes: a fixed rotating frame, a servo motor, a transmission gear box and a three-jaw chuck;

[0008] The fixed rotating frame is installed on the fixed platform; arc-shaped grooves are opened on both side walls of the fixed rotating frame;

[0009] The transmission gear box is hingedly connected to the fixed rotating frame, and both ends of the transmission gear box pass through the arc-shaped slot;

[0010] The input end of the transmission gear box is connected to the servo motor, and the output end of the transmission gear box is connected to the three-jaw chuck; the three-jaw chuck clamps the positioning clamping mechanism.

[0011] Preferably, the side wall of the fixed rotating frame is fan-shaped; the angle of the arc-shaped groove is 90°.

[0012] Preferably, both ends of the transmission gear box pass through the arc-shaped groove and are fixed and locked by locking bolts.

[0013] Preferably, the positioning and clamping mechanism comprises: a fixed back plate, a clamp base, and a housing positioning unit;

[0014] A clamp base is provided at the bottom end of the fixed back plate; the clamp base is perpendicular to the fixed back plate; a positioning pin is fixedly provided on the bottom surface of the clamp base;

[0015] The housing positioning unit includes: a first clamp cylinder, a V-shaped positioning block, a second clamp cylinder, a third clamp cylinder, a main pressure plate, and a pressure block;

[0016] The first clamp cylinder is arranged on the clamp base, and a V-shaped positioning block is provided at the telescopic end of the first clamp cylinder;

[0017] The second clamp cylinder and the third clamp cylinder are respectively arranged on the fixed back plate, and the telescopic ends of the second clamp cylinder and the third clamp cylinder are respectively connected to the two ends of the main pressure plate. A plurality of pressure blocks are arranged on the lower surface of the main pressure plate; and a clamp is arranged at the lower end of the pressure block.

[0018] Preferably, the plurality of pressing blocks are evenly arranged in the circumferential direction.

[0019] Preferably, the positioning and clamping mechanism further comprises: a joint positioning unit;

[0020] The joint positioning unit includes: a positioning block and a limiting screw;

[0021] The positioning block is arranged on the fixed back plate; at least one limiting screw is arranged in the positioning block.

[0022] Preferably, the axial direction of the first clamp cylinder is perpendicular to the clamp base;

[0023] The axial directions of the second clamp cylinder and the third clamp cylinder are perpendicular to the fixed back plate.

[0024] The utility model provides a stainless steel pressure gauge housing clamping device, which has the following advantages compared with the prior art:

[0025] 1. This utility model achieves clamping and automatic rotational positioning for the housing and connector of a stainless steel pressure gauge during laser welding. The connection between the housing and connector is fixed in place, allowing for automatic rotational positioning, facilitating accurate welding of each connection surface. It can weld housings of varying diameters, ranging from 50 to 150 mm. This adaptability reduces fixture development and saves costs.

[0026] 2. By clamping the positioning pin with a three-jaw chuck and aligning the axes, the entire positioning and clamping mechanism rotates simultaneously, achieving rotational reversal during shell laser welding and facilitating automatic rotary positioning welding operations. The servo motor can be controlled by a controller or connected to the laser welding machine's control computer, which can then precisely control start / stop and speed. This utility model can be combined with a multi-axis linkage laser welding machine to achieve continuous, automatic welding of the shell and the joint boss on all four sides, improving product production efficiency and quality. The combination of CNC linkage and a rotary mechanism results in weld quality far superior to existing manual argon arc welding or handheld laser welding.

[0027] 3. The positioning and clamping mechanism can simultaneously position the shell in the axial, radial, and circumferential directions, and can be connected to a controller to achieve a fast, precise, one-touch automatic positioning and clamping function. The three pressure blocks are placed at a fixed angle of 120° to each other and are evenly distributed to ensure uniform and firm pressure on the shell. The positioning of shells of different diameters can be met by replacing V-shaped positioning blocks of different sizes, and the relative position of the shell center can be adjusted by telescoping the cylinder. This utility model can realize automatic positioning and clamping of the pressure gauge shell, reduce errors in manual clamping operations, and improve product qualification rate.

[0028] 4. This utility model can not only greatly improve the manufacturing quality of stainless steel pressure gauge products and increase the product qualification rate, but also support the automatic laser welding process, realize the environmental protection significance of "green manufacturing", reduce the error rate and workload of manual operation, thereby improving work efficiency and ultimately achieving an increase in corporate profit margins. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a structural diagram of the stainless steel pressure gauge housing clamping device provided by the utility model;

[0030] Figure 2 This is a side view of the stainless steel pressure gauge housing clamping device provided by the utility model;

[0031] Figure 3 It is a side view of the rotating mechanism provided by the utility model;

[0032] Figure 4 This is a structural diagram of the positioning and clamping mechanism provided by the utility model;

[0033] Figure 5 This is a front view of the positioning and clamping mechanism provided by the utility model;

[0034] Figure 6 This is a front view of the positioning and clamping mechanism provided by the utility model in the clamping state;

[0035] Figure 7 This is a side view of the positioning and clamping mechanism provided by the utility model in the clamping state;

[0036] Figure 8 It is a top view of the positioning and clamping mechanism provided by the utility model in the clamping state.

[0037] Figure numerals: 1. Fixed platform; 2. Rotating mechanism; 3. Positioning and clamping mechanism; 4. Laser; 5. Housing; 6. Joint; 201. Fixed rotating frame; 202. Servo motor; 203. Transmission gear box; 304. Three-jaw chuck; 301. Fixed back plate; 302. First clamp cylinder; 303. V-shaped positioning block; 304. Main pressure plate; 305. Pressure block; 306. Clamp base; 307. Positioning pin; 308. Clamp; 309. Limiting screw; 310. Positioning block; 311. Second clamp cylinder; 312. Third clamp cylinder. DETAILED DESCRIPTION

[0038] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, rather than all of its contents.

[0039] like Figure 1-2 As shown, an embodiment of the present invention provides a stainless steel pressure gauge housing clamping device, comprising: a fixed platform 1, a rotating mechanism 2 and a positioning clamping mechanism 3.

[0040] like Figure 3As shown, the rotating mechanism 2 includes: a fixed rotating frame 201, a servo motor 202, a transmission gearbox 203, and a three-jaw chuck 204. The fixed rotating frame 201 is mounted on the fixed platform 1; arc-shaped grooves are formed on both side walls of the fixed rotating frame 201; the side walls of the fixed rotating frame 201 are fan-shaped; and the angle of the arc-shaped grooves is 90°. The transmission gearbox 203 is hingedly connected to the fixed rotating frame 201, with both ends of the transmission gearbox 203 passing through the arc-shaped grooves. After passing through the arc-shaped grooves, the ends of the transmission gearbox 203 are fixed and locked by locking bolts. The input end of the transmission gearbox 203 is connected to the servo motor 202, and the output end of the transmission gearbox 203 is connected to the three-jaw chuck 204; the three-jaw chuck 204 clamps the positioning clamping mechanism 3. Specifically, the three-jaw chuck 204 is used to clamp the positioning pin 307 of the positioning clamping mechanism 3.

[0041] The fixed turret 201 has an arc-shaped slot. Locking bolts on the transmission gearbox 203, which pass through the slot, allow the three-jaw chuck 204 to be locked at any angle between 0° and 90°, thereby enabling the three-jaw chuck 204 to rotate between 0° and 90°. The fixed turret 201 secures the rotating mechanism 2. 90° arc-shaped slots are also provided on both side walls of the fixed turret 201, allowing the three-jaw chuck 204 to be locked at any angle between 0° and 90°. The transmission gearbox 203 is hingedly connected to the fixed turret 201, enabling the transmission gearbox 203, servo motor 202, and three-jaw chuck 204 to rotate along the hinge.

[0042] The output shaft of the servo motor 202 is connected to the transmission gearbox 203, which provides rotational power to the three-jaw chuck 204 through power transmission, thereby controlling the rotation of the three-jaw chuck 203. The servo motor 202 and the three-jaw chuck 204 are connected via the transmission gearbox 203. The rotational power of the servo motor 202 is redirected and transmitted to the three-jaw chuck 204, driving the three-jaw chuck 204 to rotate, thereby rotating the positioning clamping mechanism 3 connected to the three-jaw chuck 204 and the housing 5 clamped by the positioning clamping mechanism 3, thereby achieving automatic face-changing when the pressure gauge housing 5 and the joint 6 are welded.

[0043] like Figure 4-8 As shown, the positioning and clamping mechanism 3 comprises a fixed backplate 301, a fixture base 306, a housing positioning unit, and a connector positioning unit. The fixture base 306 is disposed at the bottom end of the fixed backplate 301; the fixture base 306 is perpendicular to the fixed backplate 301. A positioning pin 307 is fixed to the bottom surface of the fixture base 306. The fixed backplate 306 is used to mount the cylinder, positioning block 310, and limit screw 309. The fixture base 306 is used to mount the cylinder and positioning pin 307. The fixed backplate 301 and fixture base 306 have a certain degree of rigidity to prevent deformation during use.

[0044] The housing positioning unit realizes the positioning of the housing 5 of the pressure gauge. The housing positioning unit includes: a first clamp cylinder 302, a V-shaped positioning block 303, a second clamp cylinder 311, a third clamp cylinder 312, a main pressure plate 304, and a pressure block 305. The first clamp cylinder 302 is set on the clamp base 306, and the axial direction of the first clamp cylinder 302 is perpendicular to the clamp base 306. The telescopic end of the first clamp cylinder 302 is provided with a V-shaped positioning block 303. The telescopic direction of the first clamp cylinder 302 is parallel to the fixed back plate 301. The axis of the first clamp cylinder 302 coincides with the axis of the pressure gauge connector 6 and the axis of the positioning pin 307. The first clamp cylinder 302 limits the radial displacement of the housing 5 through the V-shaped positioning block 303, thereby realizing radial positioning of the housing 5. The V-shaped positioning block 303 is fixed to the first clamp cylinder 302. The large flat surface of the V-shaped positioning block 303 must be parallel to the fixed back plate, and the axis of the V-shaped positioning block 303 coincides with the axis of the first clamp cylinder 302. The V-shaped positioning block 303 directly contacts the outer edge of the housing 5, limiting the radial movement of the housing 5, thereby achieving radial positioning of the housing 5.

[0045] The second clamp cylinder 311 and the third clamp cylinder 312 are respectively arranged on the fixed back plate 301, and the axial directions of the second clamp cylinder 311 and the third clamp cylinder 312 are perpendicular to the fixed back plate 301. The telescopic ends of the second clamp cylinder 311 and the third clamp cylinder 312 are respectively connected to the two ends of the main pressure plate 304. The second clamp cylinder 311 and the third clamp cylinder 312 are placed in a horizontal direction to ensure the synchronization of the telescopic movement of the two cylinders, and are used to realize the axial pressure source of the shell 5. A plurality of pressure blocks 305 are arranged on the lower surface of the main pressure plate 304, and the plurality of pressure blocks 305 are evenly arranged in the circumferential direction; a clamp 308 is provided at the lower end of the pressure block 305. The main pressure plate 304 completes the axial movement of the shell 5 through the simultaneous telescopic movement of the second clamp cylinder 311 and the third clamp cylinder 312, and transmits the axial force to the pressure block 305. Specifically, three pressure blocks 305 can be provided, and the three pressure blocks 305 are connected to the main pressure plate 304 by bolts, and an independent clamp 308 is installed at the end of the pressure block 305, which is in direct contact with the shell 5 through the clamp 308. The second clamp cylinder 311 and the third clamp cylinder 312 drive the main pressure plate 304 and the pressure block 305 to apply axial pressure to the shell 5, which can press the shell 5 against the fixed back plate 301, thereby limiting the axial displacement and circumferential rotation of the shell 5, and realizing the axial and circumferential positioning of the shell 5.

[0046] The joint positioning unit realizes the positioning and limiting of the joint 6 of the pressure gauge. The joint positioning unit includes: a positioning block 310 and a limiting screw 309; the positioning block 310 is arranged on the fixed back plate 301; at least one limiting screw 309 is arranged in the positioning block 310. The positioning block 310 is directly mounted on the fixed back plate 301, and the size of the upper rectangular groove in the direction parallel to the joint 6 is adapted to the size of the boss of the joint 6, so that the boss of the joint 6 is tightly embedded in the positioning block 310, ensuring the limitation of the parallel direction of the joint 6. The two limiting screws 309 of the joint positioning unit are placed in parallel, passing through the fixed back plate 301 and the positioning block 310, and the boss of the joint 6 is positioned by rotating the thread of the limiting screw 309, ensuring that the relative position of the joint 6 and the shell 5 remains unchanged during the welding process, thereby realizing the positioning function of the joint 6. The present utility model can meet the welding needs of different joints by replacing positioning blocks 310 of different sizes.

[0047] This utility model patent is a stainless steel pressure gauge housing clamping device, the use process is as follows:

[0048] Before laser welding, first, adjust the device to an elevation angle of 45° to ensure that the front of the positioning clamping mechanism 3 faces upward, adjust the position of the first clamp cylinder 302, and ensure the accurate relative position of the shell 5 and the joint 6. Then, simultaneously extend the second clamp cylinder 311 and the third clamp cylinder 312, leaving space for the shell 5 to be placed in the positioning position, and then place the shell 5 on the V-shaped positioning block 303, ensuring that the opening to be welded faces upward, and then put the joint 6 in and position it with the positioning block 310 and the limiting screw 309. At this time, the relative position of the shell 5 and the joint 6 has been limited. Afterwards, the second clamp cylinder 311 and the third clamp cylinder 312 are compressed at the same time, and the three pressure blocks 305 drive the clamps 308 to apply pressure to the shell 5 at the same time, so as to achieve complete limitation of the shell 5, that is, complete the automatic positioning operation of the shell 5. Finally, the laser welding head is aligned with the joint 6 to be welded on the shell 5, and the laser welding machine control program is activated to perform fully automatic rotary welding. After completing the single-side welding, the rotating mechanism 2, through the three-jaw chuck 204, drives the positioning clamping mechanism 3 to automatically rotate 90 degrees to change the side, and then complete the welding of the second side. After repeating this process four times, the automatic rotary laser welding of the entire shell 5 is complete.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications to the technical solutions described in the above embodiments, or equivalent replacement of some or all of the technical features therein, do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stainless steel pressure gauge housing clamping device, characterized in that: include: A fixed platform (1), a rotating mechanism (2) and a positioning clamping mechanism (3); The rotating mechanism (2) comprises: a fixed rotating frame (201), a servo motor (202), a transmission gear box (203) and a three-jaw chuck (204); The fixed rotating frame (201) is installed on the fixed platform (1); arc-shaped grooves are formed on both side walls of the fixed rotating frame (201); The transmission gear box (203) is hingedly connected to the fixed rotating frame (201), and both ends of the transmission gear box (203) pass through the arc-shaped slots; The input end of the transmission gear box (203) is connected to the servo motor (202), and the output end of the transmission gear box (203) is connected to the three-jaw chuck (204); the three-jaw chuck (204) clamps the positioning clamping mechanism (3).

2. The stainless steel pressure gauge housing clamping device according to claim 1, characterized in that: The side wall of the fixed rotating frame (201) is fan-shaped; the angle of the arc-shaped groove is 90°.

3. The stainless steel pressure gauge housing clamping device according to claim 2, characterized in that: The two ends of the transmission gear box (203) pass through the arc-shaped groove and are fixed and locked by locking bolts.

4. The stainless steel pressure gauge housing clamping device according to claim 1, characterized in that: The positioning and clamping mechanism (3) comprises: a fixed back plate (301), a clamp base (306), and a housing positioning unit; A clamp base (306) is provided at the bottom end of the fixed back plate (301); the clamp base (306) is perpendicular to the fixed back plate (301); a positioning pin (307) is fixedly provided on the bottom surface of the clamp base (306); The housing positioning unit comprises: a first clamp cylinder (302), a V-shaped positioning block (303), a second clamp cylinder (311), a third clamp cylinder (312), a main pressure plate (304), and a pressure block (305); The first clamp cylinder (302) is arranged on a clamp base (306), and a V-shaped positioning block (303) is arranged at the telescopic end of the first clamp cylinder (302); The second clamp cylinder (311) and the third clamp cylinder (312) are respectively arranged on the fixed back plate (301); the telescopic ends of the second clamp cylinder (311) and the third clamp cylinder (312) are respectively connected to the two ends of the main pressure plate (304); a plurality of pressure blocks (305) are arranged on the lower surface of the main pressure plate (304); and a clamp (308) is arranged at the lower end of the pressure block (305).

5. The stainless steel pressure gauge housing clamping device according to claim 4, characterized in that: The plurality of pressing blocks (305) are evenly arranged in the circumferential direction.

6. The stainless steel pressure gauge housing clamping device according to claim 4, characterized in that: The positioning and clamping mechanism (3) further comprises: a joint positioning unit; The joint positioning unit comprises: a positioning block (310) and a limiting screw (309); The positioning block (310) is arranged on the fixed back plate (301); at least one limiting screw (309) is arranged in the positioning block (310).

7. The stainless steel pressure gauge housing clamping device according to claim 4, characterized in that: The axial direction of the first clamp cylinder (302) is perpendicular to the clamp base (306); The axial directions of the second clamp cylinder (311) and the third clamp cylinder (312) are perpendicular to the fixed back plate (301).

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