Automatic welding machine for electrical engineering
By designing auxiliary structures and transmission devices in an automated submerged arc welding machine, the problem of poor flux layer coverage and out-synchronization of the welding rod movement speed during the overhang welding of the welding module is solved, and the reduction of welding arc and smoke and the improvement of welding stability is achieved. .
Patent Information
- Application Number
- CN202510051787.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-02-18
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
It is difficult for existing automated submerged arc welding machines to achieve good coverage of the flux layer during the upward welding operation, resulting in large welding arc light and smoke, and the movement speed of the welding rod and the welding machine are not synchronized, resulting in unstable welding quality.
Through auxiliary structural design, the welding module is always wrapped with a flux layer when welding, reducing welding arc and smoke; at the same time, a transmission device is used to synchronize the movement speed of the welding rod and the adjustment device, improving welding stability.
The continuous coverage of the flux layer during the welding of the welding module is achieved, reducing welding arc and smoke, and improving welding stability and quality.
Smart Images
Figure CN119457344A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of submerged arc welding machines, and more specifically to an electrical engineering automated welding machine. Background Art
[0002] Submerged arc welding is a welding method in which the arc burns under the flux layer. Its inherent advantages of stable welding quality, high welding productivity, no arc light and little smoke make it the main welding method in the production of important steel structures such as pressure vessels, pipe section manufacturing, box beams and columns.
[0003] Submerged arc welding usually uses an automated trolley to drive the welding module to move at a constant speed to complete long-distance welding work. Traditional automated submerged arc welding machines on the market are not easy to provide good flux layer coverage for overhead welding operations, resulting in larger welding arcs and smoke. In addition, the welding rod is prone to being out of sync with the movement speed of the welding machine during the feeding process, resulting in unstable welding quality. Summary of the invention
[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an electrical engineering automatic welding machine, which can achieve that the welding module is always surrounded by a flux layer during overhead welding through an auxiliary structure, thereby reducing welding arc and smoke, and the transmission device synchronizes the movement speed of the welding rod and the adjustment device, thereby improving welding stability.
[0005] To solve the above problems, the present invention adopts the following technical solutions.
[0006] An electrical engineering automatic welding machine comprises an adjusting device, wherein the middle part of the adjusting device comprises a base, the outer end of the base is rotatably connected to a wheel, the middle part of the upper end of the base is provided with a material storage trough, the middle part of the base is provided with a placement groove located at the lower end of the material storage trough, a wire take-up roller is installed in the middle of the placement groove, a welding rod is wound and connected to the outer side of the wire take-up roller, the upper end of the placement groove is fixedly connected to a cover plate, the middle part of the upper end of the cover plate is fixedly connected to a sleeve, the upper part of the outer end of the sleeve is rotatably connected to an internal threaded sleeve, the middle part of the internal threaded sleeve is threadedly connected to a screw, the outer end of the sleeve is fixedly connected to a material extraction module, a pipe body is installed in the middle of the material extraction module, the upper end of the screw is fixedly connected to an auxiliary structure, the auxiliary structure comprises a linkage device, the middle part of the linkage device is fixedly connected to a material guide device, both ends of the linkage device are fixedly connected to a transmission device, and the linkage device comprises a rectangular block, the middle part of the rectangular block is provided with a The cam is provided with a toothed plate, and the toothed plate is provided with a toothed plate at the bottom of the cam, and the toothed plate is provided with a toothed plate at the bottom of the cam.
[0007] Furthermore, the material guiding device includes a base plate, a sliding groove is provided in the middle of the base plate, grooves are provided in the middle of the base plate at both ends of the sliding groove, a rectangular hole is provided at the rear end of the base plate, an oblique bracket is fixedly connected to the upper end of the base plate, a U-shaped rod is slidably connected to the middle of the sliding groove, pull blocks are provided at both ends of the U-shaped rod, a tension spring is fixedly connected to the rear end of the pull block, four adapter blocks are equidistantly fixedly connected to the upper end of the U-shaped rod, an oblique plate is fixedly connected to the upper end of the oblique plate, and four arc blocks are equidistantly fixedly connected to the lower end of the oblique plate, so that the flux particles drawn into the material trough by the extraction module through the tube body can fall into the surrounding of the welding module through the material guiding device.
[0008] Furthermore, the transmission device includes a disc, a plurality of adaptation grooves are opened at equal angles in the middle of the disc, a compression spring is placed in the middle of the adaptation groove, and a rubber block is slidably connected to the middle of the adaptation groove, so that the transmission device can reach a corresponding rotation speed according to the movement speed of the wheel.
[0009] Furthermore, an annular protrusion is provided on the outside of the upper end of the sleeve, and the end of the welding rod passes through the cover plate into the cylindrical hole, and the tube body passes through the middle of the through hole, and flux particles are stored inside the storage tank, so that the internal threaded sleeve is not easy to fall off from the outside of the sleeve, and the welding rod can continuously feed the welding module, and the flux particles can be delivered around the welding module.
[0010] Furthermore, the driving gear and the driven gear are meshingly connected, and the guide wheel and the rotating wheel can limit the welding rod, so that the driving gear can drive the driven gear to rotate, and the guide wheel can drive the welding rod to move by rotating.
[0011] Furthermore, the push block can push the U-shaped rod to move, and the rear end of the tension spring is fixedly connected to the bottom plate, so that the U-shaped rod can reciprocate to drive the oblique plate to vibrate, and the oblique plate vibrates to move the flux particles downward.
[0012] Furthermore, the rear ends of the adapter block and the arc block are both semicircular arcs, and the adapter block and the arc block can contact each other, and the heights of the four adapter blocks match the heights of the corresponding positions of the inclined plate, so that the adapter block is not easily obstructed during movement, and the adapter block can drive the arc block to move, and the adapter block changes height according to the distance between the corresponding position and the bottom of the inclined plate.
[0013] Furthermore, the front end of the inclined plate contacts the upper part of the rear end of the support block, and the upper end of the blocking plate is lower than the upper end of the rectangular block, so that the flux particles in the trough can fall into the upper side of the inclined plate, and the excess flux particles can fall back into the storage trough through the gap between the blocking plate and the bottom of the object to be welded.
[0014] Furthermore, a rectangular protrusion is provided at one end of the rubber block close to the disc, and the upper end of the disc is lower than the upper end of the rectangular block, and the upper end of the rubber block can move to a position higher than the upper end of the rectangular block, so that the rubber block is not easy to fall out of the middle of the adapter groove, and the disc is not easy to hinder the rectangular block from contacting the bottom of the object to be welded.
[0015] Compared with the prior art, the advantages of the present invention are: (1) This scheme uses an auxiliary structure to ensure that the welding module is always surrounded by a flux layer during overhead welding, thereby reducing welding arc and smoke. The transmission device synchronizes the movement speed of the welding rod and the adjustment device, thereby improving welding stability.
[0016] (2) Excess flux particles can fall back into the storage tank through the gap between the blocking plate and the bottom of the object to be welded, completing the recovery of the flux particles. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is an overall stereogram of the present invention; Figure 2It is a partial half-section stereoscopic view of the adjustment device of the present invention; Figure 3 It is an overall three-dimensional diagram of the auxiliary structure of the present invention; Figure 4 It is a split stereogram of the auxiliary structure of the present invention; Figure 5 It is a partial half-section stereoscopic view of the linkage device of the present invention; Figure 6 It is a disassembled stereoscopic diagram of the material guiding device of the present invention; Figure 7 It is a partial half-section front view schematic diagram of the material guiding device of the present invention; Figure 8 It is a partial half-section stereoscopic view of the transmission device of the present invention; Fig. 9 It is a schematic diagram of the working principle of the auxiliary structure of the present invention; Fig.10 for Fig. 9 A partial enlarged view of .
[0018] Description of the numbers in the figure: 1. Adjustment device; 101. Base; 102. Wheel; 103. Storage tank; 104. Placement tank; 105. Take-up roller; 106. Welding rod; 107. Cover plate; 108. Sleeve; 109. Internal thread sleeve; 110. Screw; 111. Extraction module; 112. Tube; 2. Linkage device; 201. Rectangular block; 202. Rectangular slot; 203. Welding module; 204. Crossbar; 205. Driving gear; 206. Push block; 207. Column hole; 208. Rotating wheel; 209. Guide wheel; 2 10. Rotating rod; 211. Driven gear; 212. Blocking plate; 213. Support block; 214. Material drop chute; 215. Through hole; 3. Material guide device; 301. Bottom plate; 302. Sliding groove; 303. Groove; 304. Rectangular hole; 305. Oblique bracket; 306. U-shaped rod; 307. Pull block; 308. Tension spring; 309. Adapter block; 310. Oblique plate; 311. Arc block; 4. Transmission device; 401. Disc; 402. Adapter groove; 403. Compression spring; 404. Rubber block. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.
[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of the adapter model component. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] See also Figure 1-10, an electrical engineering automatic welding machine, comprising an adjusting device 1, the adjusting device 1 comprises a base 101 in the middle, the outer end of the base 101 is rotatably connected to a wheel 102, a material storage tank 103 is provided in the middle of the upper end of the base 101, a placement tank 104 is provided in the middle of the base 101 at the lower end of the material storage tank 103, a wire take-up roller 105 is installed in the middle of the placement tank 104, a welding rod 106 is wound around the outer side of the wire take-up roller 105, a cover plate 107 is fixedly connected to the upper end of the placement tank 104, and the cover plate 1 A sleeve 108 is fixedly connected to the middle of the upper end of 07, an internal thread sleeve 109 is rotatably connected to the upper part of the outer end of the sleeve 108, a screw 110 is threadedly connected to the middle of the internal thread sleeve 109, a material extraction module 111 is fixedly connected to the outer end of the sleeve 108, a tube body 112 is installed in the middle of the material extraction module 111, an auxiliary structure is fixedly connected to the upper end of the screw 110, and the auxiliary structure includes a linkage device 2, a material guide device 3 is fixedly connected to the middle of the linkage device 2, and transmission devices 4 are fixedly connected to both ends of the linkage device 2 The linkage device 2 includes a rectangular block 201, a rectangular groove 202 is opened in the middle of the rectangular block 201, a welding module 203 is fixedly installed in the middle of the rectangular groove 202, a cross bar 204 is rotatably connected in the middle of the rectangular block 201, and driving gears 205 are fixedly connected at both ends of the cross bar 204. The outer end of the cross bar 204 is located in the middle of the rectangular groove 202 and is fixedly connected to a push block 206. The middle of the rectangular block 201 is located at the lower end of the rectangular groove 202 and is fixedly connected to a columnar hole 207. The middle of the rectangular block 201 is located at the column A rotating wheel 208 is rotatably connected to the rear side of the cylindrical hole 207, a guide wheel 209 is rotatably connected to the middle of the rectangular block 201 located in front of the cylindrical hole 207, a rotating rod 210 is fixedly connected to the middle of the guide wheel 209, both ends of the rotating rod 210 are fixedly connected to driven gears 211, a blocking plate 212 is fixedly connected to the middle of the rear end of the rectangular block 201, a supporting block 213 is fixedly connected to the front end of the rectangular block 201, a blanking groove 214 is opened at the upper end of the supporting block 213, and a through hole 215 is opened in the middle of the supporting block 213.
[0023] See also Figure 2-8The material guiding device 3 includes a bottom plate 301, a sliding groove 302 is provided in the middle of the bottom plate 301, grooves 303 are provided in the middle of the bottom plate 301 at both ends of the sliding groove 302, a rectangular hole 304 is provided at the rear end of the bottom plate 301, an oblique bracket 305 is fixedly connected to the upper end of the bottom plate 301, a U-shaped rod 306 is slidably connected to the middle of the sliding groove 302, pull blocks 307 are provided at both ends of the U-shaped rod 306, a tension spring 308 is fixedly connected to the rear end of the pull block 307, four adapter blocks 309 are equidistantly fixedly connected to the upper end of the U-shaped rod 306, an oblique plate 310 is fixedly connected to the upper end of the oblique bracket 305, and four arc blocks 311 are equidistantly fixedly connected to the lower end of the oblique plate 310, so that the flux particles drawn into the blanking trough 214 by the extraction module 111 through the tube body 112 can fall into the surrounding of the welding module 203 through the material guiding device 3. The transmission device 4 includes a disc 401, a plurality of adapting grooves 402 are opened at equal angles in the middle of the disc 401, a compression spring 403 is placed in the middle of the adapting groove 402, and a rubber block 404 is slidably connected in the middle of the adapting groove 402, so that the transmission device 4 can reach a corresponding rotation speed according to the movement speed of the wheel 102.
[0024] See also Figure 2-7 , an annular protrusion is provided on the outer upper end of the sleeve 108, and the end of the welding rod 106 passes through the cover plate 107 and enters the cylindrical hole 207, and the tube body 112 passes through the middle of the through hole 215, and the flux particles are stored inside the storage tank 103, so that the internal thread sleeve 109 is not easy to escape from the outside of the sleeve 108, and the welding rod 106 can continue to feed the welding module 203, and the flux particles can be fed around the welding module 203. The driving gear 205 and the driven gear 211 are meshed and connected, and the guide wheel 209 and the rotating wheel 208 can limit the welding rod 106, so that the driving gear 205 can drive the driven gear 211 to rotate, and the guide wheel 209 can drive the welding rod 106 to move by rotating. The push block 206 can push the U-shaped rod 306 to move, and the rear end of the tension spring 308 is fixedly connected to the bottom plate 301, so that the U-shaped rod 306 can reciprocate to drive the inclined plate 310 to vibrate, and the inclined plate 310 vibrates to move the flux particles downward.
[0025] See also Figure 2-9The rear ends of the adapter block 309 and the arc block 311 are both semicircular arc-shaped, and the adapter block 309 and the arc block 311 can contact each other, and the heights of the four adapter blocks 309 are matched with the heights of the corresponding positions of the oblique plate 310, so that the adapter block 309 is not easily blocked during movement, and the adapter block 309 can drive the arc block 311 to move, and the adapter block 309 changes its height according to the distance between the corresponding position and the bottom of the oblique plate 310. The front end of the oblique plate 310 contacts the upper part of the rear end of the support block 213, and the upper end of the blocking plate 212 is lower than the upper end of the rectangular block 201, so that the flux particles in the drop groove 214 can fall into the upper side of the oblique plate 310, and the excess flux particles can fall back into the storage groove 103 through the gap between the blocking plate 212 and the bottom of the object to be welded. A rectangular protrusion is provided at one end of the rubber block 404 close to the disc 401, and the upper end of the disc 401 is lower than the upper end of the rectangular block 201, and the upper end of the rubber block 404 can move to a position higher than the upper end of the rectangular block 201, so that the rubber block 404 is not easy to fall out of the middle of the adapter groove 402, and the disc 401 is not easy to hinder the rectangular block 201 from contacting the bottom of the object to be welded.
[0026] During overhead welding, the internal threaded sleeve 109 is rotated, and the internal threaded sleeve 109 drives the screw 110 to move upward. When the upper end of the rectangular block 201 contacts the bottom of the object to be welded, the internal threaded sleeve 109 is stopped from rotating. At this time, under the action of the compression spring 403, the rubber block 404 located on the upper side contacts the bottom of the object to be welded, and the welding rod 106 is inserted into the middle of the cylindrical hole 207 through the cover plate 107. The top of the welding rod 106 contacts the welding module 203, and the extraction module 111 is opened to allow the flux particles inside the storage tank 103 to enter the blanking tank 214 through the tube body 112. After that, the flux particles slide downward through the material guide device 3 to cover the welding module 203 and the welding rod 106. At this time, the welding module 203, the welding rod 106 and the object to be welded are isolated from the outside world by the flux particles, and the excess flux particles are discharged through the gap between the blocking plate 212 and the bottom of the object to be welded and fall back into the storage tank 103. The wheel 102 drives the adjusting device 1 to move forward. When the adjusting device 1 moves forward, the rubber block 404 moves relative to the bottom of the object to be welded. At this time, the transmission device 4 rotates, and the transmission device 4 drives the driving gear 205 and the push block 206 to rotate through the cross bar 204. The driving gear 205 drives the driven gear 211 to rotate, and the driven gear 211 drives the guide wheel 209 to rotate through the rotating rod 210. The guide wheel 209 drives the welding rod 106 to move upward through the rotation and the limiting effect of the rotating wheel 208. The speed of the welding rod 106 moving upward matches the movement speed of the wheel 102. The welding module 203 can perform continuous welding during the movement of the wheel. The push block 206 rotates along the cross bar 204, and the push block 206 contacts the rear end of the U-shaped rod 306 during the rotation process. The push block 206 continues to move to drive the U-shaped rod 306 to move forward. After the push block 206 continues to move, it no longer contacts the U-shaped rod 306. Under the action of the tension spring 308, the tension spring 308 drives the U-shaped rod 306 to move backward through the pull block 307, and the U-shaped rod 306 drives the adapter block 309 to move backward. The adapter block 309 hits the arc block 311 during the backward movement, and the arc block 311 causes the oblique plate 310 to vibrate. The flux particles on the upper side of the oblique plate 310 fall into the rear end of the oblique plate 310 with the vibration, so that the welding module 203, the welding rod 106 and the bottom of the object to be welded are covered with flux particles. The wheel 102 continues to move forward, the rising speed of the welding rod 106 always matches the moving speed of the wheel 102, and the flux particles always cover the welding rod 106, the welding module 203 and the bottom of the object to be welded. The auxiliary structure can be used to ensure that the welding module 203 is always surrounded by a flux layer during overhead welding, thereby reducing welding arc and smoke, and the transmission device 4 synchronizes the moving speed of the welding rod 106 with the adjusting device 1, thereby improving welding stability.
[0027] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An electrical engineering automated welding machine, comprising a regulating device (1), characterized in that: The adjusting device (1) comprises a base (101) in the middle, the outer end of the base (101) is rotatably connected to a wheel (102), a material storage trough (103) is provided in the middle of the upper end of the base (101), a placement groove (104) is provided in the middle of the base (101) at the lower end of the material storage trough (103), a wire take-up roller (105) is installed in the middle of the placement groove (104), a welding rod (106) is wound around the outer side of the wire take-up roller (105), and the placement groove (104) The upper end is fixedly connected to a cover plate (107), the middle part of the upper end of the cover plate (107) is fixedly connected to a sleeve (108), the upper part of the outer end of the sleeve (108) is rotatably connected to an internal thread sleeve (109), the middle part of the internal thread sleeve (109) is threadedly connected to a screw rod (110), the outer end of the sleeve (108) is fixedly connected to a material extraction module (111), the middle part of the material extraction module (111) is equipped with a tube body (112), and the upper end of the screw rod (110) is fixedly connected to an auxiliary structure; The auxiliary structure comprises a linkage device (2), a material guide device (3) is fixedly connected to the middle of the linkage device (2), and transmission devices (4) are fixedly connected to both ends of the linkage device (2); The linkage device (2) comprises a rectangular block (201), a rectangular groove (202) is provided in the middle of the rectangular block (201), a welding module (203) is fixedly installed in the middle of the rectangular groove (202), a cross bar (204) is rotatably connected in the middle of the rectangular block (201), driving gears (205) are fixedly connected at both ends of the cross bar (204), a push block (206) is fixedly connected at the outer end of the cross bar (204) located in the middle of the rectangular groove (202), a columnar hole (207) is fixedly connected at the lower end of the rectangular groove (202), and a portion of the rectangular block (201) is fixedly connected to the middle of the rectangular groove (202). A rotating wheel (208) is rotatably connected to the rear side of the cylindrical hole (207); a guide wheel (209) is rotatably connected to the middle of the rectangular block (201) located in front of the cylindrical hole (207); a rotating rod (210) is fixedly connected to the middle of the guide wheel (209); both ends of the rotating rod (210) are fixedly connected to driven gears (211); a blocking plate (212) is fixedly connected to the middle of the rear end of the rectangular block (201); a supporting block (213) is fixedly connected to the front end of the rectangular block (201); a material dropping groove (214) is provided at the upper end of the supporting block (213); and a through hole (215) is provided in the middle of the supporting block (213).
2. The electrical engineering automatic welding machine according to claim 1, characterized in that: The material guiding device (3) comprises a bottom plate (301), a sliding groove (302) is provided in the middle of the bottom plate (301), grooves (303) are provided in the middle of the bottom plate (301) at both left and right ends of the sliding groove (302), a rectangular hole (304) is provided at the rear end of the bottom plate (301), an oblique bracket (305) is fixedly connected to the upper end of the bottom plate (301), a U-shaped rod (306) is slidably connected to the middle of the sliding groove (302), a pull block (307) is provided at both left and right ends of the U-shaped rod (306), a tension spring (308) is fixedly connected to the rear end of the pull block (307), four adapter blocks (309) are equidistantly fixedly connected to the upper end of the U-shaped rod (306), an oblique plate (310) is fixedly connected to the upper end of the oblique bracket (305), and four arc blocks (311) are fixedly connected to the lower end of the oblique plate (310) at equal distances.
3. The electrical engineering automatic welding machine according to claim 1, characterized in that: The transmission device (4) comprises a disc (401), a plurality of adapting grooves (402) are provided at equal angles in the middle of the disc (401), a compression spring (403) is placed in the middle of the adapting groove (402), and a rubber block (404) is slidably connected to the middle of the adapting groove (402).
4. The electrical engineering automatic welding machine according to claim 1, characterized in that: An annular protrusion is provided on the outer upper end of the sleeve (108), the end of the welding rod (106) passes through the cover plate (107) and enters the cylindrical hole (207), the tube body (112) passes through the middle of the through hole (215), and flux particles are stored inside the storage tank (103).
5. The electrical engineering automatic welding machine according to claim 1, characterized in that: The driving gear (205) and the driven gear (211) are meshed and connected, and the guide wheel (209) and the rotating wheel (208) can limit the position of the welding rod (106).
6. The electrical engineering automatic welding machine according to claim 2, characterized in that: The push block (206) is capable of pushing the U-shaped rod (306) to move, and the rear end of the tension spring (308) is fixedly connected to the bottom plate (301).
7. The electrical engineering automatic welding machine according to claim 2, characterized in that: The rear ends of the adapter block (309) and the arc block (311) are both semicircular arc-shaped, and the adapter block (309) and the arc block (311) are able to contact each other, and the heights of the four adapter blocks (309) all match the heights of corresponding positions of the oblique plate (310).
8. The electrical engineering automatic welding machine according to claim 2, characterized in that: The front end of the inclined plate (310) contacts the upper portion of the rear end of the support block (213), and the upper end of the blocking plate (212) is lower than the upper end of the rectangular block (201).
9. The electrical engineering automatic welding machine according to claim 3, characterized in that: The rubber block (404) is provided with a rectangular protrusion at one end close to the disc (401), and the upper end of the disc (401) is lower than the upper end of the rectangular block (201), and the upper end of the rubber block (404) can move to a position higher than the upper end of the rectangular block (201).