Single-face welding and double-face forming welding device for water supply and drainage pipe fittings

Abstract

The invention belongs to the technical field of pipeline welding, and particularly relates to a water supply and drainage pipe single-face welding and double-face forming welding device which comprises a welding workbench, the welding workbench is provided with two symmetrically-arranged clamping assemblies, and the clamping assemblies are used for clamping and fixing a to-be-welded pipe. An annular supporting frame is fixed to the welding workbench through an L-shaped supporting plate, a first L-shaped mounting plate capable of rotating around the annular supporting frame is arranged on the annular supporting frame, a welding gun is arranged on the first L-shaped mounting plate, and the clamping assembly comprises two annular plates arranged above the welding workbench. Three first air cylinders which are evenly distributed in the circumferential direction are arranged on the outer side wall of each annular plate. The walking motor drives the first L-shaped mounting plate to rotate around the annular supporting frame, meanwhile, the driving assembly drives the welding gun to move back and forth along the sliding groove, the two kinds of movement are overlapped to form a sawtooth-shaped welding track, and the fusion quality of a welding seam is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of pipeline welding technology, and in particular relates to a welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings. Background Technology

[0002] In the field of water supply and drainage engineering, pipe fittings are the core carriers of fluid transportation, and their connection quality directly determines the sealing performance, pressure resistance and service life of the entire system. Welding is the mainstream process for connecting water supply and drainage pipe fittings.

[0003] To improve the welding quality and efficiency of water supply and drainage pipe fittings, the single-sided welding double-sided forming welding process is widely used in the welding of water supply and drainage pipe fittings. This welding process can achieve double-sided forming in one welding, with uniform and full welds, high weld density, and stronger corrosion resistance, which is suitable for the long-term water transport needs of water supply and drainage pipelines.

[0004] However, in the single-sided welding double-sided forming welding process, a gap needs to be reserved between the two pipe fittings to be welded, so as to provide space for the electric arc to penetrate into the root of the pipe fitting weld. Currently, in the automatic welding equipment for pipe fittings, the movement trajectory of the welding torch is a single ring, and the weld is relatively narrow, which cannot be adapted to the single-sided welding double-sided forming welding process. Therefore, when water supply and drainage pipes adopt the single-sided welding double-sided forming welding process, manual electric arc welding is usually used, which has low work efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems mentioned in the background art by providing a welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings, comprising a welding worktable, wherein the welding worktable is provided with two sets of symmetrically arranged clamping components, the clamping components being used to clamp and fix the pipe fittings to be welded;

[0007] The welding workbench is fixed with an annular support frame by an L-shaped support plate. The annular support frame is provided with a first L-shaped mounting plate that can rotate around the annular support frame. The welding gun is provided on the first L-shaped mounting plate.

[0008] Furthermore, the clamping assembly includes two annular plates disposed above the welding workbench. Each annular plate has three circumferentially evenly distributed first cylinders on its outer side wall. The output shaft of the first cylinder passes through the annular plate, and the output end of the first cylinder is fixedly connected to a clamping plate.

[0009] Furthermore, the welding worktable is provided with a displacement component for driving the clamping assembly to move horizontally. The displacement component includes two symmetrical first slide rails on the welding worktable, and two electric sliders are slidably engaged on each first slide rail. The annular plate is fixed to the electric sliders by an L-shaped support rod.

[0010] Furthermore, the first L-shaped mounting plate is provided with multiple limiting wheels, and the outer side wall of the annular support frame is provided with annular limiting grooves adapted to the limiting wheels. The first L-shaped mounting plate is provided with a travel motor, and the output shaft of the travel motor is connected to a drive shaft that rotates with the first L-shaped mounting plate through a coupling. The drive shaft is provided with a drive gear, and the inner side wall of the first L-shaped mounting plate is provided with a tooth groove adapted to the drive gear. When the travel motor rotates, the first L-shaped mounting plate moves on the annular support frame through the cooperation of the drive gear and the tooth groove.

[0011] Furthermore, a groove is provided on the horizontal plate of the first L-shaped mounting plate, and a suitable slider is provided in the groove, with the welding torch mounted on the slider.

[0012] Furthermore, a second L-shaped mounting plate is fixedly connected to the side wall of the slider near the center of the annular support frame. A second cylinder is provided on the vertical side wall of the second L-shaped mounting plate. A clamp is provided at the output end of the second cylinder, and the welding gun is fixedly connected to the clamp.

[0013] Furthermore, the first L-shaped mounting plate is provided with a driving assembly for driving the slider to move. The driving assembly includes a second threaded rod rotatably mounted on the first L-shaped mounting plate, and a connecting block that is threadedly engaged with the second threaded rod is fixedly connected to the slider.

[0014] Furthermore, the drive assembly also includes a swing arm fixed to the drive shaft, the swing arm having a cylindrical pin, a second slide rail fixedly connected to the horizontal plate of the first L-shaped mounting plate, a rack slidably engaged on the second slide rail, a vertical rod fixedly connected to the rack, a U-shaped groove being formed on the vertical rod, the cylindrical pin slidably engaged within the U-shaped groove, and a spur gear meshing with the rack on the second threaded rod. When the swing arm rotates, the cylindrical pin drives the vertical rod and rack to reciprocate. When the rack reciprocates, the spur gear drives the second threaded rod to reciprocate. When the second threaded rod reciprocates, it drives the slider and welding torch to reciprocate.

[0015] Furthermore, the swing arm is provided with a first rectangular groove and a second rectangular groove. A second motor is provided in the first rectangular groove, and a third threaded rod is rotatably provided in the second rectangular groove. The output shaft of the second motor is connected to the third threaded rod through a coupling. A rectangular block is slidably provided in the second rectangular groove and threadedly connected to the third threaded rod. The rectangular block is slidably engaged with the second rectangular groove, and the cylindrical pin is fixedly connected to the rectangular block.

[0016] Compared with existing technologies, the advantages of this invention are:

[0017] 1. This invention uses a walking motor to drive the first L-shaped mounting plate to rotate around the annular support frame, while the driving component drives the welding torch to move back and forth along the slide. The superposition of the two movements forms a sawtooth welding trajectory, which not only increases the effective width of the weld, but also makes the weld metal cross-fused in the axial direction, so that the weld and the side wall and root of the pipe bevel can be more fully combined, effectively improving the fusion quality of the weld.

[0018] 2. This invention utilizes the change in the linear velocity component of the cylindrical pin during the circular motion of the swing arm to achieve adaptive adjustment of the welding torch speed decreasing when it approaches the weld edge and increasing when it is at the weld center. The decrease in speed when the welding torch approaches the weld edge ensures full fusion between the bevel sidewall and the weld metal, reducing the risk of incomplete fusion. The increase in speed when the welding torch is at the weld center allows the welding torch to pass quickly through the weld center, reducing heat accumulation and lowering the risk of weld center collapse and burn-through.

[0019] 3. This invention drives the third threaded rod to rotate via the second motor, causing the rectangular block to slide along the second rectangular groove, thereby adjusting the distance between the cylindrical pin and the drive shaft, changing the reciprocating range of the rack, and through the cooperation of the spur gear and the second threaded rod, achieving precise adjustment of the reciprocating distance of the welding torch, adapting to the welding needs of pipes of different thicknesses and specifications. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings provided by the present invention.

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the clamping assembly structure of a single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the annular plate structure of a single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the displacement component structure of a single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings provided by the present invention;

[0025] Figure 6 This is a schematic diagram of the swing arm structure of a single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings provided by the present invention.

[0026] In the diagram, 10 is the welding workbench, 11 is the first slide rail, and 12 is the electric slider.

[0027] 20 L-shaped support plate, 21 annular support frame, 22 first L-shaped mounting plate, 23 limiting wheel, 24 travel motor, 211 annular limiting groove, 25 drive shaft, 26 drive gear, 212 tooth groove, 221 slide groove, 222 slider, 223 second L-shaped mounting plate, 224 second cylinder, 225 clamp;

[0028] 30. Annular plate; 31. First cylinder; 32. Clamping plate; 301. L-shaped support rod;

[0029] 40 Second threaded rod, 41 Connecting block, 42 ​​Swing arm, 43 Cylindrical pin, 44 Second slide rail, 45 Rack, 46 Vertical rod, 461 U-shaped groove, 47 Spur gear, 421 First rectangular groove, 422 Second rectangular groove, 423 Second motor, 424 Third threaded rod, 425 Rectangular block;

[0030] 50 welding torch. Detailed Implementation

[0031] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] like Figures 1-6 As shown, a welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings includes a welding workbench 10. The welding workbench 10 is made of cast iron to ensure structural stability. The welding workbench 10 is provided with two sets of symmetrically arranged clamping components for clamping and fixing the pipe fittings to be welded. An L-shaped support plate 20 is fixed to the welding workbench 10 by bolts. The horizontal plate of the L-shaped support plate 20 is in contact with the welding workbench 10, and the top of the vertical plate is fixed to an annular support frame 21 by bolts. The annular support frame 21 is coaxially arranged with the pipe fittings to be welded. The annular support frame 21 is provided with a first L-shaped mounting plate 22 that can rotate around the annular support frame 21. A welding torch 50 is provided on the first L-shaped mounting plate 22. In this embodiment, the welding torch 50 is an argon arc welding torch.

[0033] The clamping assembly includes two annular plates 30 positioned above the welding worktable 10. The inner diameter of each annular plate 30 is larger than the outer diameter of the pipe to be welded. Three circumferentially evenly distributed first cylinders 31 are fixed to the outer wall of each annular plate 30. The output shaft of each first cylinder 31 passes through the annular plate 30, and a clamping plate 32 is fixed to the end of the output shaft by screws. A rubber plate is fixed to the clamping surface of the clamping plate 32 to prevent damage to the pipe surface and to increase friction. The welding worktable 10 is equipped with a displacement assembly for driving the horizontal movement of the clamping assembly. The displacement assembly includes components positioned above the welding worktable 10. Two symmetrical first slide rails 11 are on the worktable 10. The first slide rails 11 are fixed to the top surface of the welding worktable 10 by bolts. Each first slide rail 11 has two electric sliders 12 that are slidably engaged. The electric sliders 12 adopt existing technology. An L-shaped support rod 301 is welded on the annular plate 30. The bottom of the L-shaped support rod 301 is fixed to the electric slider 12 by screws. The electric slider 12 moves along the first slide rail 11, which drives the annular plate 30 and the clamping assembly to move horizontally as a whole, thereby adjusting the distance between the two sets of clamping assemblies and thus changing the size of the welding gap.

[0034] The inner sidewall of the vertical plate of the first L-shaped mounting plate 22 is provided with multiple limiting wheels 23. In this embodiment, there are two limiting wheels 23. The limiting wheels 23 are evenly distributed along the circumference of the annular support frame 21. The outer sidewall of the annular support frame 21 is provided with annular limiting grooves 211 that are adapted to the limiting wheels 23. The limiting wheels 23 are embedded in the annular limiting grooves 211 to ensure the stable rotation of the first L-shaped mounting plate 22. A travel motor 24 is fixed to the outer sidewall of the vertical plate of the first L-shaped mounting plate 22 by bolts. The output shaft of 4 passes through the vertical plate of the first L-shaped mounting plate and is connected to the drive shaft 25, which is rotatably engaged with the first L-shaped mounting plate 22, via a coupling. The drive shaft 25 is keyed with a drive gear 26. The inner side wall of the annular support frame 21 is provided with a tooth groove 212 that is adapted to the drive gear 26. When the walking motor 24 rotates, the drive shaft 25 drives the drive gear 26 to rotate. Through the meshing transmission between the drive gear 26 and the tooth groove 212, the first L-shaped mounting plate 22 can move smoothly along the annular support frame 21.

[0035] A groove 221 is provided on the horizontal plate of the first L-shaped mounting plate 22. The groove 221 is arranged along the axial direction of the annular support frame 21. A suitable slider 222 is provided in the groove 221. The slider 222 slides in cooperation with the groove 221. A second L-shaped mounting plate 223 is fixed to the side wall of the slider 222 near the center of the annular support frame 21 by screws. A second cylinder 224 is fixed to the vertical side wall of the second L-shaped mounting plate 223 by bolts. A clamp 225 is fixed to the output end of the second cylinder 224 by screws. The clamp 225 adopts a two-half structure and is locked by bolts. The welding torch 50 is fixed in the clamp 225. The height of the welding torch 50 can be adjusted by the extension and retraction of the second cylinder 224 to adapt to the welding position of pipe fittings of different diameters.

[0036] The first L-shaped mounting plate 22 is provided with a drive assembly for moving the slider 222. The drive assembly includes a second threaded rod 40 rotatably mounted on the horizontal plate of the first L-shaped mounting plate 22 via bearings. The second threaded rod 40 is arranged along the length direction of the slide groove 221. A connecting block 41 is fixed to the slider 222 by screws. The connecting block 41 has a threaded hole and is threadedly engaged with the second threaded rod 40. The drive assembly also includes a swing arm 42 welded to the drive shaft 25. The swing arm 42 is provided with a cylindrical pin 43, which is arranged perpendicular to the swing arm 42. A second slide rail 44 is fixed to the horizontal plate of the first L-shaped mounting plate 22 by bolts. A rack 45 is slidably engaged on the second slide rail 44. A vertical rod 46 is welded to the side, and a U-shaped groove 461 is opened on the vertical rod 46. A cylindrical pin 43 is slidably engaged in the U-shaped groove 461. One end of the second threaded rod 40 is keyed to a spur gear 47, which meshes with a rack 45. When the swing arm 42 rotates with the drive shaft 25, the cylindrical pin 43 slides in the U-shaped groove 461, which simultaneously drives the vertical rod 46 and the rack 45 to reciprocate along the second slide rail 44. When the rack 45 reciprocates, it drives the second threaded rod 40 to reciprocate through the spur gear 47. When the second threaded rod 40 reciprocates, it drives the connecting block 41 and the slider 222 to reciprocate along the slide groove 221, thereby realizing the reciprocating movement of the welding torch 50. This reciprocating movement is superimposed with the rotational movement of the first L-shaped mounting plate 22 to form a sawtooth trajectory.

[0037] It is worth mentioning that when the welding torch 50 is near the edge of the weld, the swing arm 42 is near its limit stroke. At this time, the linear velocity component of the cylindrical pin 43 along the circumferential tangent is the smallest, and the reciprocating speed of the welding torch 50 driven by the slider 222 is reduced. This ensures that the bevel sidewall and the weld metal are fully fused, reducing the risk of incomplete fusion. When the welding torch 50 rotates to the center of the weld, the swing arm 42 is in the middle of the rotation trajectory. At this time, the linear velocity component of the cylindrical pin 43 along the circumferential tangent is the largest, driving the rack 45 to move at the fastest speed. Correspondingly, the reciprocating speed of the welding torch 50 reaches its maximum, enabling the center to pass quickly, reducing heat accumulation, and reducing the risk of weld center collapse and burn-through.

[0038] The swing arm 42 has a first rectangular groove 421 and a second rectangular groove 422, which are arranged along the length of the swing arm 42. A second motor 423 is fixed in the first rectangular groove 421 by bolts. A third threaded rod 424 is rotatably mounted in the second rectangular groove 422 via bearings. The third threaded rod 424 is arranged along the length of the second rectangular groove 422. The output shaft of the second motor 423 is connected to the third threaded rod 424 via a coupling. A rectangular block 4 is slidably mounted in the second rectangular groove 422. 25. A threaded hole is provided on the rectangular block 425, which is threadedly connected to the third threaded rod 424. The two side walls of the rectangular block 425 are in contact with the inner side wall of the second rectangular groove 422 to achieve a sliding fit. The cylindrical pin 43 is welded to the end of the rectangular block 425. Starting the second motor 423 can drive the third threaded rod 424 to rotate, causing the rectangular block 425 to slide along the second rectangular groove 422, thereby adjusting the distance between the cylindrical pin 43 and the drive shaft 25, changing the reciprocating stroke of the rack 45, and finally realizing the adjustment of the reciprocating movement distance of the welding torch 50.

[0039] The working principle of this invention is as follows:

[0040] Two water supply and drainage pipe fittings to be welded are placed in two clamping assemblies respectively. The first cylinder 31 is activated to drive the clamping plate 32 to move towards the center until the three clamping plates 32 are tightly attached to the outer wall of the pipe fitting, thus achieving fixed clamping of the pipe fitting. Then the electric slider 12 is activated to adjust the distance between the two annular plates 30, thereby changing the gap between the two water supply and drainage pipe fittings.

[0041] Start the second cylinder 224, adjust the height of the welding torch 50 so that the nozzle of the welding torch 50 is aligned with the weld seam of the pipe fitting, and then start the second motor 423 according to the welding requirements, adjust the distance between the cylindrical pin 43 and the drive shaft 25, and set the reciprocating stroke range of the welding torch 50.

[0042] The welding torch 50 and the travel motor 24 are started. The travel motor 24 drives the drive shaft 25 to rotate. Through the cooperation of the drive gear 26 and the tooth groove 212, the first L-shaped mounting plate 22 is driven to rotate along the annular support frame 21. The welding torch 50 performs welding work by making a circular motion with the first L-shaped mounting plate 22. At the same time, the drive shaft 25 drives the swing arm 42 to rotate. The cylindrical pin 43 slides in the U-shaped groove 461 and drives the vertical rod 46 and the rack 45 to move back and forth. Through the column gear 47, the second threaded rod 40 is driven to rotate back and forth, which in turn drives the slider 222 and the welding torch 50 to move back and forth along the slide groove 221. The two movements are superimposed to form a sawtooth welding trajectory, which not only increases the effective width of the weld, but also makes the weld metal cross-melt in the axial direction, so that the weld and the side wall and root of the pipe bevel can be more fully combined, effectively improving the fusion quality of the weld.

[0043] During the welding process, when the welding torch 50 is close to the edge of the weld, the swing arm 42 is near its limit stroke, the linear velocity component of the cylindrical pin 43 is small, and the moving speed of the welding torch 50 is low, which can ensure that the bevel sidewall and the weld metal are fully fused and reduce the risk of incomplete fusion. When the welding torch 50 is at the center of the weld, the swing arm 42 is in the middle position, the linear velocity component of the cylindrical pin 43 is large, and the moving speed of the welding torch 50 is increased, so that the center passes through quickly, reducing heat accumulation and reducing the risk of weld center collapse and burn-through. The welding torch 50 speed is adaptively adjusted to ensure the weld formation quality.

[0044] After the pipe fitting is welded once, turn off the walking motor 24 and the welding gun 50, start the first cylinder 31 to make the clamping plate 32 release the pipe fitting, take out the welded pipe fitting, and complete one welding operation.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings, comprising a welding workbench (10), characterized in that: The welding workbench (10) is provided with two sets of symmetrically arranged clamping components, which are used to clamp and fix the pipe to be welded; The welding workbench (10) is fixed with an annular support frame (21) by an L-shaped support plate (20). The annular support frame (21) is provided with a first L-shaped mounting plate (22) that can rotate around the annular support frame (21). The first L-shaped mounting plate (22) is provided with a welding torch (50).

2. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 1, characterized in that, The clamping assembly includes two annular plates (30) located above the welding workbench (10). Each annular plate (30) has three circumferentially evenly distributed first cylinders (31) on its outer side wall. The output shaft of the first cylinder (31) passes through the annular plate (30), and the output end of the first cylinder (31) is fixedly connected to a clamping plate (32).

3. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 2, characterized in that, The welding workbench (10) is provided with a displacement component for driving the clamping assembly to move horizontally. The displacement component includes two symmetrical first slide rails (11) on the welding workbench (10). Each first slide rail (11) has two electric sliders (12) that slide together. The annular plate (30) is fixed to the electric sliders (12) by an L-shaped support rod (301).

4. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 1, characterized in that, The first L-shaped mounting plate (22) is provided with multiple limiting wheels (23). The outer wall of the annular support frame (21) is provided with an annular limiting groove (211) that is adapted to the limiting wheels (23). The first L-shaped mounting plate (22) is provided with a walking motor (24). The output shaft of the walking motor (24) is connected to a drive shaft (25) that rotates with the first L-shaped mounting plate (22) through a coupling. The drive shaft (25) is provided with a drive gear (26). The inner wall of the first L-shaped mounting plate (22) is provided with a tooth groove (212) that is adapted to the drive gear (26). When the walking motor (24) rotates, the first L-shaped mounting plate (22) moves on the annular support frame (21) through the cooperation of the drive gear (26) and the tooth groove (212).

5. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 4, characterized in that, The first L-shaped mounting plate (22) has a groove (221) on its horizontal plate, and a matching slider (222) is provided in the groove (221). The welding gun (50) is located on the slider (222).

6. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 5, characterized in that, The slider (222) is fixed to the side wall near the center of the annular support frame (21) with a second L-shaped mounting plate (223). The vertical side wall of the second L-shaped mounting plate (223) is provided with a second cylinder (224). The output end of the second cylinder (224) is provided with a clamp (225). The welding gun (50) is fixed to the clamp (225).

7. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 6, characterized in that, The first L-shaped mounting plate (22) is provided with a driving assembly for driving the slider (222) to move. The driving assembly includes a second threaded rod (40) rotatably mounted on the first L-shaped mounting plate (22). The slider (222) is fixedly connected with a connecting block (41) that is threadedly engaged with the second threaded rod (40).

8. The single-sided welding and double-sided forming welding device for water supply and drainage pipe fittings according to claim 7, characterized in that, The drive assembly also includes a swing arm (42) fixed to the drive shaft (25). A cylindrical pin (43) is provided on the swing arm (42). A second slide rail (44) is fixedly connected to the horizontal plate of the first L-shaped mounting plate (22). A rack (45) is slidably engaged on the second slide rail (44). A vertical rod (46) is fixedly connected to the rack (45). A U-shaped groove (461) is provided on the vertical rod (46). The cylindrical pin (43) is slidably engaged with the U-shaped groove (461). Inside the groove (461), the second threaded rod (40) is provided with a spur gear (47) that meshes with the rack (45). When the swing arm (42) rotates, it drives the vertical rod (46) and the rack (45) to move back and forth through the cylindrical pin (43). When the rack (45) moves back and forth, it drives the second threaded rod (40) to rotate back and forth through the spur gear (47). When the second threaded rod (40) rotates back and forth, it drives the slider (222) and the welding torch (50) to move back and forth.

9. A welding device for single-sided welding and double-sided forming of water supply and drainage pipe fittings according to claim 8, characterized in that, The swing arm (42) is provided with a first rectangular groove (421) and a second rectangular groove (422). A second motor (423) is provided in the first rectangular groove (421). A third threaded rod (424) is rotatably provided in the second rectangular groove (422). The output shaft of the second motor (423) is connected to the third threaded rod (424) through a coupling. A rectangular block (425) is slidably provided in the second rectangular groove (422) and threadedly connected to the third threaded rod (424). The rectangular block (425) is slidably engaged with the second rectangular groove (422). The cylindrical pin (43) is fixedly connected to the rectangular block (425).

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