Automatic positioning clamp for laser welding of pressure gauge shell

Abstract

The utility model relates to the technical field of clamps, and provides a pressure gauge shell laser welding automatic positioning clamp which comprises a fixing back plate, a gauge shell positioning mechanism and a connector positioning mechanism, and the gauge shell positioning mechanism and the connector positioning mechanism are arranged on the fixing back plate. A circular groove is formed in the fixed back plate; the watchcase positioning mechanism comprises an axial positioning unit and two lateral positioning units. The axial positioning unit comprises an axial air cylinder, a main pressing block and a clamp. The axial cylinder is mounted on the fixed back plate; a main pressing block is arranged on a telescopic rod of the axial air cylinder and located in the radial direction of the circular groove, and a clamp is installed at the tail end of the main pressing block. The clamp is positioned in the axial direction of the circular groove; the lateral positioning unit comprises a lateral air cylinder and a lateral pressing block; the lateral air cylinder is mounted on the fixed back plate; a lateral pressing block is arranged on a telescopic rod of the lateral air cylinder. According to the utility model, automatic positioning and clamping of the pressure gauge shell can be realized, and manual clamping operation errors are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fixtures, in particular to an automatic positioning fixture for laser welding of a pressure gauge case. Background Art

[0002] Pressure gauges are widely used in industrial sectors such as petroleum, chemical industry, chemical fiber, wastewater treatment, power stations, and food to measure the pressure of various fluid media in process flows with relatively high requirements for corrosion resistance and high temperature resistance. The pressure gauge measures the pressure by the elastic deformation of the stainless steel sensitive element (Bourdon tube, diaphragm box, bellows) inside the gauge, and then the conversion mechanism inside the movement of the gauge conducts the elastic deformation to the pointer, causing the pointer to rotate to display the pressure. The structure of the pressure gauge is fully sealed, and the inside of the case is only connected to the outside through a joint, having strong capabilities of preventing corrosion by the measured medium and resisting environmental corrosion.

[0003] In summary, the quality of the sealing performance of the pressure gauge is the key to evaluating important indicators such as its pressure resistance, high temperature resistance, and corrosion resistance. The connection between the pressure gauge case and the joint is particularly important. The materials of both the case and the joint are 304 stainless steel or 316 stainless steel, and the welding method is the most commonly used and effective, which can meet requirements such as good sealing performance and pressure strength.

[0004] However, when fixedly welding the circular case and the square joint boss in the prior art, the operation is inconvenient, there is a situation of inaccurate positioning, which will cause a decrease in the product qualification rate; different diameter cases of the welding positioning fixture require different fixtures, and the fixture cost is relatively high. Therefore, using an efficient and precise automatic positioning fixture is the key to solving this problem. Summary of the Utility Model

[0005] The utility model mainly solves the technical problem that when fixedly welding the circular case and the square joint boss in the prior art, the operation is inconvenient, there is a situation of inaccurate positioning, which will cause a decrease in the product qualification rate, and proposes an automatic positioning fixture for laser welding of a pressure gauge case to achieve automatic positioning and clamping of the pressure gauge case, reduce manual clamping operation errors, and improve the product qualification rate.

[0006] The utility model provides an automatic positioning fixture for laser welding of a pressure gauge case, including: a fixed back plate and a case positioning mechanism and a joint positioning mechanism arranged on the fixed back plate;

[0007] A circular groove is arranged on the fixed back plate;

[0008] The case positioning mechanism includes: an axial positioning unit and two lateral positioning units;

[0009] The axial positioning unit includes: an axial cylinder, a main pressure block, and a clamp;

[0010] The axial cylinder is mounted on the fixed back plate and is located beside the circular groove; the axis of the axial cylinder is perpendicular to the fixed back plate;

[0011] A main pressing block is arranged on the telescopic rod of the axial cylinder, the main pressing block is located in the radial direction of the circular groove, and a clamp is installed at the end of the main pressing block; the clamp is located in the axial direction of the circular groove;

[0012] The lateral positioning unit includes: a lateral cylinder and a lateral pressing block;

[0013] The lateral cylinder is mounted on the fixed back plate and is located beside the circular groove; the axis of the lateral cylinder is parallel to the fixed back plate; a lateral pressing block is arranged on the telescopic rod of the lateral cylinder;

[0014] The joint positioning mechanism includes: an inner limiting block and a positioning block;

[0015] The inner limiting block is fixed in the circular groove and is used for contacting the inner diameter surface of the watch case; the limiting curvature of the inner limiting block is adapted to the inner diameter curvature of the watch case;

[0016] The positioning block is fixed in the circular groove, and a rectangular groove is formed on the positioning block;

[0017] At least one limiting screw is arranged in the rectangular groove of the positioning block.

[0018] Preferably, the lateral cylinder is mounted on the fixed back plate through a lateral cylinder fixing seat.

[0019] Preferably, a base is arranged at the bottom of the fixed back plate, and a positioning pin is installed at the bottom of the base.

[0020] Preferably, a copper block is arranged at the end of the lateral pressing block.

[0021] An automatic positioning fixture for laser welding of a pressure gauge watch case provided by the utility model has the following advantages compared with the prior art:

[0022] 1. Realize automatic positioning and clamping of the pressure gauge watch case, reduce manual clamping operation errors, and improve the product qualification rate;

[0023] 2. Realize relatively precise positioning of the joint and the watch case, improve the welding precision, and thus improve the product qualification rate;

[0024] 3. The utility model is applicable to watch cases with different diameters, reduces the development of tooling fixtures, and saves costs;

[0025] 4. Through the design and manufacture of the utility model and in combination with the automatic laser welding method, the manufacturing quality of the pressure gauge product can be greatly improved, the product qualification rate can be improved, the error rate and workload of manual operation can be reduced, thereby improving the work efficiency, and finally the corporate profit rate can be increased. Brief Description of the Drawings

[0026] Figure 1 is the front view of the automatic positioning fixture for laser welding of the pressure gauge case provided by the present utility model;

[0027] Figure 2 is the perspective view of the clamping state of the automatic positioning fixture for laser welding of the pressure gauge case provided by the present utility model;

[0028] Figure 3 is the side view of the clamping state of the automatic positioning fixture for laser welding of the pressure gauge case provided by the present utility model;

[0029] Figure 4 is the top view of the clamping state of the automatic positioning fixture for laser welding of the pressure gauge case provided by the present utility model.

[0030] Reference Numerals: a, case; b, joint; 1, fixed back plate; 2, base; 3, lateral cylinder; 4, lateral cylinder fixing seat; 5, lateral pressing block; 6, axial cylinder; 7, main pressing block; 8, inner limiting block; 9, limiting screw; 10, positioning block; 11, positioning pin; 12, copper block; 13, clamp; 14, circular groove. Detailed Description of the Preferred Embodiment

[0031] In order to make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the content.

[0032] As Figures 1-4 shown, an automatic positioning fixture for laser welding of a pressure gauge case provided by an embodiment of the present utility model includes: a fixed back plate 1 and a case positioning mechanism and a joint positioning mechanism provided on the fixed back plate 1.

[0033] A circular groove 14 is provided on the fixed back plate 1, and the circular groove 14 is used to place the case a.

[0034] The case positioning mechanism includes: an axial positioning unit and two lateral positioning units.

[0035] The axial positioning unit includes: an axial cylinder 6, a main pressing block 7, and a clamp 13. The axial cylinder 6 is installed on the fixed back plate 1 and is located beside the circular groove 14. The axis of the axial cylinder 6 is perpendicular to the fixed back plate 1. The main pressing block 7 is arranged on the telescopic rod of the axial cylinder 6. The main pressing block 7 is located in the radial direction of the circular groove 14, and the clamp 13 is installed at the end of the main pressing block 7. The clamp 13 is located in the axial direction of the circular groove 14. The telescopic direction of the telescopic rod of the axial cylinder 6 is parallel to the axis of the watch case a. The telescopic movement of the telescopic rod of the axial cylinder 6 can drive the clamp 13 to move through the main pressing block 7. The clamp 13 presses the watch case a on the fixed back plate 1 through the expansion and contraction of the axial cylinder 6, thereby restricting the axial movement of the watch case a and realizing the axial positioning of the watch case a.

[0036] The lateral positioning unit includes: a lateral cylinder 3 and a lateral pressing block 5. The lateral cylinder 3 is installed on the fixed back plate 1 and is located beside the circular groove 14. Specifically, the lateral cylinder 3 is installed on the fixed back plate 1 through a lateral cylinder fixing seat 4. The axis of the lateral cylinder 3 is parallel to the fixed back plate 1. The lateral pressing block 5 is arranged on the telescopic rod of the lateral cylinder 3. A copper block 12 is arranged at the end of the lateral pressing block 5, and the copper block 12 is in direct contact with the watch case a. The lateral pressing blocks 5 of the two lateral positioning units are arranged oppositely. The two copper blocks 12 press the watch case a on the inner limiting block 8 through the expansion and contraction of the lateral cylinder 3, thereby restricting the radial movement and circumferential rotation of the watch case a and realizing the radial and circumferential positioning of the watch case a.

[0037] The joint positioning mechanism includes: an inner limiting block 8 and a positioning block 10. The inner limiting block 8 is fixed in the circular groove 14 and is used to contact the inner diameter surface of the watch case a. The limiting curvature of the inner limiting block 8 is adapted to the inner diameter curvature of the watch case a to ensure complete fitting when the two are in contact, so as to jointly complete the positioning of the watch case in combination with the pressure exerted by the pressing block 8.

[0038] The positioning block 10 is fixed in the circular groove 14. A rectangular groove is formed on the positioning block 10. The size of the rectangular groove is adapted to the size of the boss of the joint b, and the boss of the joint b can be tightly embedded in the positioning block 10 to ensure the limit in the parallel direction of the joint b. At least one limiting screw 9 is arranged in the rectangular groove of the positioning block 10. Specifically, two limiting screws 9 can be arranged. The two limiting screws 9 are placed in parallel, pass through the fixed back plate 1 and the positioning block 10, and position the boss of the joint b through the rotation of the screw thread of the screw 9 to ensure that the relative position between the joint b and the watch case a remains unchanged during the welding process and realize the positioning function of the joint b.

[0039] The case positioning mechanism and the joint positioning mechanism are both installed on the fixed backplane 1. The fixed backplane 1 has a certain rigidity and flatness, which are used to fix and support other mechanisms and structures. The flatness can ensure the accuracy of the telescopic direction of the cylinder and the positioning of the boss of joint b. A base 2 is provided at the bottom of the fixed backplane 1, and a positioning pin 11 is installed at the bottom of the base 2 to ensure the perpendicularity between the fixed backplane 1 and the positioning pin 11. The base 2 needs to have a certain rigidity and strength to meet the load-bearing requirements of other mechanisms. The positioning pin 11 is installed on the base 2 and coincides with the axial center of joint b to meet the synchronous rotation and direction consistency of driving the positioning pin 11 and joint b.

[0040] The using process of the present utility model: Before laser welding, first, the fixture is placed vertically. First, the three cylinders are extended to leave a space for placing the case a of the pressure gauge. Then, the case a is placed on the fixed backplane 1 and closely attached to the inner limit block 8, and the welding joint between the case a and the joint b faces vertically upward. Then, the joint b is placed into the case a and placed on the positioning block 10, and then the limit screw 9 is used to complete the limit and positioning of the joint b. Finally, the control button is pressed to make the three cylinders contract simultaneously. The axial cylinder 6 drives the clamp 13 on the main pressure block 7, and the lateral cylinder 3 drives the lateral pressure block 5 and the copper block 12 to apply pressure to the case a simultaneously, realizing the limit of the case a in all directions, that is, completing the automatic positioning operation of the case a.

[0041] The present utility model can position the case a axially, radially and circumferentially through three cylinders simultaneously, and can be connected with a controller to realize the automatic positioning and clamping function of fast, accurate and one-key type, which can meet the automatic positioning function of the case a of the pressure gauge and the joint b during laser welding, making the relative positions of the case a and the joint b fixed for accurate welding. By replacing the inner limit blocks with different curvature values, the positioning of cases a with different diameters can be satisfied, and the welding of cases a with different diameters can be realized. The diameter range of the case a is 50 - 150 mm. By replacing the positioning blocks with different sizes, the welding of different joints can be satisfied. By combining the positioning pin with other mechanisms, the movement or rotation in different directions can be realized for convenient welding operation.

[0042] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An automatic positioning fixture for laser welding of a pressure gauge case, characterized in that Comprising: A fixed backplane (1), a watch case positioning mechanism, and a joint positioning mechanism provided on the fixed backplane (1); A circular groove (14) is provided on the fixed backplane (1); The watch case positioning mechanism includes: an axial positioning unit and two lateral positioning units; The axial positioning unit includes: an axial cylinder (6), a main pressing block (7), and a clamp (13); The axial cylinder (6) is installed on the fixed backplane (1) and is located beside the circular groove (14); the axis of the axial cylinder (6) is perpendicular to the fixed backplane (1); A main pressing block (7) is provided on the telescopic rod of the axial cylinder (6), the main pressing block (7) is located in the radial direction of the circular groove (14), and a clamp (13) is installed at the end of the main pressing block (7); the clamp (13) is located in the axial direction of the circular groove (14); The lateral positioning unit includes: a lateral cylinder (3) and a lateral pressing block (5); The lateral cylinder (3) is installed on the fixed backplane (1) and is located beside the circular groove (14); the axis of the lateral cylinder (3) is parallel to the fixed backplane (1); a lateral pressing block (5) is provided on the telescopic rod of the lateral cylinder (3); The joint positioning mechanism includes: an inner limiting block (8) and a positioning block (10); The inner limiting block (8) is fixed in the circular groove (14) and is used to contact the inner diameter surface of the watch case (a); the limiting curvature of the inner limiting block (8) is adapted to the inner diameter curvature of the watch case (a); The positioning block (10) is fixed in the circular groove (14), and a rectangular groove is provided on the positioning block (10); At least one limiting screw (9) is provided in the rectangular groove of the positioning block (10).

2. The automatic positioning fixture for laser welding of the pressure gauge case according to claim 1, wherein The lateral cylinder (3) is installed on the fixed backplane (1) through a lateral cylinder fixing seat (4).

3. The automatic positioning fixture for laser welding of the pressure gauge case according to claim 1, characterized in that, A base (2) is provided at the bottom of the fixed backplane (1), and a positioning pin (11) is installed at the bottom of the base (2).

4. The automatic positioning fixture for laser welding of the pressure gauge case according to claim 1, characterized in that A copper block (12) is provided at the end of the lateral pressing block (5).

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