Annealing, cooling and cleaning device for copper wire processing

Abstract

This utility model belongs to the field of copper wire processing technology, and particularly relates to an annealing cooling and cleaning device for copper wire processing. It includes an annealing furnace, a cooling pool, a water outlet, cooling components, and connecting plates. The annealing furnace has wire-passing ports on both the upper left and right sides. The cooling pool is installed on the lower right side of the annealing furnace. The water outlet is fixed to the lower right front side of the cooling pool, with the bottom of its water outlet channel flush with the bottom of the cooling pool. Two cooling components are distributed vertically and installed at the rear of the cooling pool. The front edge of each cooling component is vertically aligned with the rear edge of the cooling pool. Each pair of vertically aligned connecting plates forms a group, with four groups in total, fixed inside the cooling pool. By designing a drive component in the cleaning mechanism, the cleaning wheel rotates intermittently and automatically, allowing the surface of the cleaning wheel at different positions to intermittently contact the scraper, effectively removing residue from the surface of the cleaning wheel without requiring manual shutdown for cleaning, ensuring continuous operation of the production line and overall production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of copper wire processing technology, and in particular relates to an annealing, cooling and cleaning device for copper wire processing. Background Technology

[0002] Copper wire is a metallic material made of copper alloy. It possesses excellent electrical and thermal conductivity and ductility, and is widely used in the manufacture of wires, cables, brushes, as well as coils for transformers, motors, and various electrical appliances. During processing, copper wire requires annealing to eliminate internal stresses generated during manufacturing, preventing breakage due to stress concentration during use. After annealing, the copper wire also needs cooling and cleaning. Cooling helps maintain the properties acquired during annealing, while cleaning removes the oxide layer formed on the surface of the copper wire during annealing.

[0003] Patent CN218620977U discloses an annealing device for copper wire drawing, including a support plate. An annealing furnace is fixedly embedded in the side of the support plate, and multiple guide components are arranged on the side of the support plate for guiding the copper wire. A cooling groove is fixedly arranged at the bottom of the support plate. Although the above patent can remove the oxide layer on the surface of the copper wire using two sponge wheels, residues easily accumulate on the surface of the sponge wheels during the oxide layer removal process. If these residues accumulate for a long time without timely cleaning, they will not only affect the cleaning effect of the sponge wheels but may also cause secondary pollution to the surface of the copper wire. To address this problem, it is currently necessary to manually stop the machine periodically to manually clean the residues on the sponge wheels. This cleaning method not only increases the labor intensity of the operators but also inevitably interrupts the continuous operation of the production line, affecting the overall production efficiency.

[0004] Therefore, there is a particular need for an annealing, cooling, and cleaning device for copper wire processing to solve the above problems. Utility Model Content

[0005] To overcome the shortcomings of existing patents that require manual periodic shutdowns for cleaning the sponge wheels, which increases labor intensity, interrupts continuous production line operation, and affects production efficiency, this utility model provides an annealing cooling and cleaning device for copper wire processing.

[0006] This utility model is achieved through the following technical means: an annealing cooling and cleaning device for copper wire processing, comprising an annealing furnace, a cooling pool, a water outlet, cooling components, a wire guide wheel, a transmission component, a winding component, a limiting frame, a connecting plate, a movable frame, and a cleaning mechanism. The annealing furnace has wire guide holes on both the upper left and right sides. The cooling pool is installed on the lower right side of the annealing furnace, and the water outlet is fixed to the lower right front side of the cooling pool. The bottom end of its water outlet channel is flush with the bottom end of the cooling pool. Two cooling components are distributed vertically and installed at the rear of the cooling pool. The front edge of each cooling component is vertically aligned with the rear edge of the cooling pool. Each pair of vertically aligned components... There are four sets of connecting plates, fixed inside the cooling pool. The four sets of connecting plates are located on the upper left, upper right, lower left, and lower right sides. Each wire guide wheel is rotatably connected between each set of connecting plates. The transmission assembly is located between the cooling pool, the lower left wire guide wheel, and the lower right wire guide wheel. The winding assembly is located on the right side of the cooling pool via two L-shaped plates. The limiting frame consists of vertical and horizontal rods and is fixed to the bottom of the cooling pool. The upper part of the vertical rod is fixedly engaged with the corresponding connecting plate. The movable frame is slidably connected to the limiting frame. Two cleaning mechanisms for removing the oxide layer on the surface of the copper wire are distributed on the left and right sides and are located on the movable frame.

[0007] In a preferred embodiment of this utility model, the transmission assembly includes a motor, a pulley assembly, and a rotating shaft. Two rotating shafts are distributed on the left and right sides, respectively rotatably connected to the lower left and lower right wire guide wheels, and pass through two corresponding sets of connecting plates for rotatable cooperation. The front end of each rotating shaft extends to the outside of the cooling pool. The motor is installed on the lower left side of the cooling pool, with its output shaft facing backward and fixedly connected to the front end of the left rotating shaft. The pulley assembly is disposed between the front ends of the two rotating shafts and located outside the cooling pool.

[0008] In a preferred embodiment of this utility model, each cleaning mechanism includes a cleaning wheel, a connecting rod, a spring, a sliding sleeve, a drive assembly, a scraper, and a fixed frame. The first fixed frame is fixedly connected to the movable frame. Each pair of adjacent connecting rods forms a group, and there are two groups in total. These groups are fixedly connected to the first fixed frame. Each sliding sleeve is slidably connected between each group of connecting rods. Each pair of adjacent springs forms a group, and there are two groups in total. These groups are respectively disposed inside the two sliding sleeves. The two ends of each spring are fixedly connected to the corresponding sliding sleeve and the corresponding connecting rod. Each cleaning wheel is rotatably connected to each fixed frame. Each scraper is fixedly connected to each fixed frame and is located on one side of the corresponding cleaning wheel, in contact with it. The drive assembly for driving the cleaning wheel to rotate is disposed between the left rotating shaft, the two cleaning wheels, and the two fixed frames.

[0009] In a preferred embodiment of the present invention, the drive assembly includes a rotating disk, a locking pin, a rack, and gears. The rotating disk is fixed to the rear end of the left rotating shaft, the locking pin is fixed to the eccentric position on the rear side of the rotating disk and slides with the movable frame, each rack is slidably connected to each fixed frame, and each gear is fixed to each cleaning wheel and meshes with it on the corresponding rack side.

[0010] In a preferred embodiment of this utility model, it further includes an air pump, air pipes, and air outlets. The air pump is installed in the center of the right side of the cooling pool, with its air outlet facing upward and its air inlet facing downward. Two air pipes are symmetrically distributed and fixed to the air outlet of the air pump. Every three air outlets form a group and are fixed to each air pipe. The distribution positions of every three air outlets are the front side, the rear side, and the bottom side. The highest point of the winding surface of the upper right side guide wheel is higher than the highest point of the lower side air outlet and lower than the lowest points of the front side air outlet and the rear side air outlet.

[0011] In a preferred embodiment of this utility model, the upper cooling component is positioned close to the highest water level in the internal area of ​​the cooling pool, while the lower cooling component is positioned close to the lowest water level in the internal area of ​​the cooling pool.

[0012] In a preferred embodiment of this utility model, one end of the air outlet adopts a flattened design, which is wide and flat.

[0013] In a preferred embodiment of this utility model, the four racks are respectively aligned with the vertical or horizontal rods of the limiting frame.

[0014] Beneficial effects:

[0015] By designing a drive component in the cleaning mechanism, the cleaning wheel can be rotated intermittently and automatically, allowing the surface of the cleaning wheel at different locations to come into intermittent contact with the scraper. This effectively removes residues from the surface of the cleaning wheel without requiring manual shutdown for cleaning, ensuring continuous operation of the production line and overall production efficiency.

[0016] By using a combination of air pump, air hose and air outlet, the residual moisture on the surface of copper wire is effectively dried, avoiding quality problems caused by residual moisture during the winding process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a partially sectional view of the covered cooling pool component of this utility model.

[0019] Figure 3 This is a partial cross-sectional view of the cooling pool component of this utility model.

[0020] Figure 4This is a three-dimensional structural diagram of the rotating disk, locking column, and movable frame components of this utility model.

[0021] Figure 5 This is a partial cross-sectional view of the sliding sleeve component of this utility model.

[0022] The components in the attached diagram are labeled as follows: 1. Annealing furnace, 2. Cooling pool, 3. Water outlet, 4. Cooling assembly, 5. Wire guide wheel, 6. Motor, 7. Pulley assembly, 8. Rotating shaft, 9. Air pump, 10. Air pipe, 11. Air outlet, 12. Winding assembly, 121. Limiting frame, 13. Connecting plate, 14. Rotary disc, 16. Locking post, 17. Movable frame, 18. Cleaning wheel, 19. Rack, 20. Gear, 21. Connecting rod, 22. Spring, 23. Sliding sleeve, 24. Scraper, 25. Fixing frame. Detailed Implementation

[0023] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0024] Example: An annealing, cooling, and cleaning device for copper wire processing, such as... Figures 1-5As shown, the system includes an annealing furnace 1, a cooling pool 2, a water outlet 3, cooling components 4, a wire guide wheel 5, a transmission assembly, a winding assembly 12, a limit frame 121, a connecting plate 13, a movable frame 17, and a cleaning mechanism. The annealing furnace 1 has wire-passing ports on both the upper left and right sides. The cooling pool 2 is bolted to the lower right side of the annealing furnace 1. The water outlet 3 is welded to the lower right front side of the cooling pool 2, with its bottom end flush with the inner bottom of the cooling pool 2 to ensure sufficient drainage of water. The water outlet 3 has threads for easy capping. Two cooling components 4 are arranged vertically and bolted to the rear of the cooling pool 2. This is existing technology, allowing for simple cooling of the water in the cooling pool 2. The front edge of each cooling component 4 is vertically aligned with the inner rear edge of the cooling pool 2, ensuring direct contact between the cooling component 4 and the water in the cooling pool 2. The upper cooling component 4 is positioned near the highest water level in the cooling pool 2, while the lower cooling component 4 is positioned near the lowest water level in the cooling pool 2. At the low water level, the cooling effect of the cooling component 4 is maximized. Each pair of longitudinally aligned connecting plates 13 forms a group, with a total of four groups. These groups are welded together inside the cooling pool 2. The four groups of connecting plates 13 are located on the upper left, upper right, lower left, and lower right sides. Each guide wheel 5 is rotatably connected between each group of connecting plates 13. The right-side threading port of the annealing furnace 1 is located to the left of the upper left guide wheel 5. The transmission component is positioned between the cooling pool 2, the lower left guide wheel 5, and the lower right guide wheel 5. The winding component 12... Two L-shaped plates are installed on the right side of the cooling pool 2, which is an existing technology. The copper wire can be wound up with simple operation. The limiting frame 121 consists of a vertical rod and a horizontal rod, which are connected to the bottom of the cooling pool 2 by welding. The upper part of the vertical rod is fixedly engaged with the corresponding connecting plate 13, thereby providing a second support point for the limiting frame 121 and improving its stability. The movable frame 17 is slidably connected to the limiting frame 121. Two cleaning mechanisms for removing the oxide layer on the surface of the copper wire are distributed on the left and right and set on the movable frame 17.

[0025] like Figures 2-4 As shown, the transmission assembly includes a motor 6, a pulley assembly 7, and two rotating shafts 8. The two rotating shafts 8 are distributed on the left and right sides, respectively rotatably connected to the lower left wire guide wheel 5 and the lower right wire guide wheel 5, and pass through the corresponding two sets of connecting plates 13 to rotate with them. The front end of each rotating shaft 8 extends to the outside of the cooling pool 2. The motor 6 is connected to the lower left side of the cooling pool 2 by bolts, with its output shaft facing backward and fixedly connected to the front end of the left rotating shaft 8. The pulley assembly 7 is located between the front ends of the two rotating shafts 8 and is located outside the cooling pool 2.

[0026] like Figure 4 and Figure 5As shown, each cleaning mechanism includes a cleaning wheel 18, connecting rods 21, springs 22, sliding sleeves 23, a drive assembly, a scraper 24, and a fixing frame 25. The first fixing frame 25 is welded to the movable frame 17. Two adjacent connecting rods 21 form a group, and there are two groups in total. These groups are welded to the first fixing frame 25. Each sliding sleeve 23 is slidably connected between each group of connecting rods 21. Two adjacent springs 22 form a group, and there are two groups in total. These groups are respectively located inside the two sliding sleeves 23. Each spring 22 has two... Each end is fixedly connected to the corresponding sliding sleeve 23 and the corresponding connecting rod 21. Each cleaning wheel 18 is rotatably connected to each fixed frame 25. Each scraper 24 is connected to each fixed frame 25 by welding and is located on one side of the corresponding cleaning wheel 18 and in contact with it. The scraping surface of the scraper 24 is designed as a slope, so that the scraped impurities can smoothly slide into the water in the inner area of ​​the cooling pool 2 along the slope. The drive component for driving the rotation of the cleaning wheel 18 is set between the left rotating shaft 8, the two cleaning wheels 18 and the two fixed frames 25.

[0027] like Figure 4 and Figure 5 As shown, the drive assembly includes a rotating disk 14, a retaining pin 16, a rack 19, and a gear 20. The rotating disk 14 is connected to the rear end of the left rotating shaft 8 by welding. The retaining pin 16 is connected to the eccentric position on the rear side of the rotating disk 14 by welding and slides with the movable frame 17. Each rack 19 is slidably connected to each fixed frame 25. Each gear 20 is connected to each cleaning wheel 18 by welding and is located on the side of the corresponding rack 19 and meshes with it.

[0028] like Figure 2 and Figure 3 As shown, it also includes an air pump 9, air pipes 10, and air outlets 11. The air pump 9 is bolted to the center of the right side of the cooling pool 2, with its outlet facing upwards and its inlet facing downwards. Two air pipes 10 are symmetrically distributed and welded to the outlet of the air pump 9. They are also fixed to the cooling pool 2 by a long strip plate to improve the stability of the two air pipes 10. Every three air outlets 11 form a group and are welded to each air pipe 10. The distribution of every three air outlets 11 is front-to-back. The highest point of the winding surface of the upper right guide roller 5 is higher than the highest point of the lower air outlet 11, but lower than the lowest points of the front and rear air outlets 11. This ensures that when the upper right guide roller 5 guides the copper wire to the winding assembly 12 for winding, the copper wire does not come into contact with the air outlet 11. The jet end of the air outlet 11 adopts a flat design, which is wide and flat, which helps to achieve uniform gas distribution when it is ejected and avoids uneven airflow caused by shape limitations during the ejection process.

[0029] like Figure 4As shown, the four racks 19 are respectively aligned with the vertical or horizontal rods of the limiting frame 121. Specifically, the two racks 19 on the left are aligned with the horizontal rods of the limiting frame 121, and the two racks 19 on the right are aligned with the vertical rods of the limiting frame 121. The distance between the right end of the two racks 19 on the left and the horizontal rod of the limiting frame 121 is equal to the distance between the right end of the two racks 19 on the right and the vertical rod of the limiting frame 121, ensuring that all four racks 19 simultaneously contact the limiting frame 121 and are held in place.

[0030] Initially, spring 22 is in a stretched state, and the two adjacent cleaning wheels 18 maintain the maximum distance. The operator first uses the provided screw cap to close the water outlet 3, pours an appropriate amount of water into the cooling pool 2, and ensures that the water level exceeds the upper cooling component 4. Then, the two cooling components 4 are started to cool the water in the internal area of ​​the cooling pool 2. Next, the copper wire to be annealed is inserted into the wire threading port on the left side of the annealing furnace 1, and the annealing furnace 1 is started to anneal the copper wire. The annealed copper wire is sent out from the wire threading port on the right side of the annealing furnace 1. When the copper wire of an appropriate length is sent out, the annealing furnace 1 is temporarily closed. When the sent copper wire is immersed in the water in the internal area of ​​the cooling pool 2, it is cooled and cleaned.

[0031] Then, wearing heat-resistant gloves, pull the copper wire to pass around the four wire guide rollers 5 in turn, and pull the copper wire through the four cleaning rollers 18. When the diameter of the copper wire is greater than the distance between two adjacent cleaning rollers 18, move one of the cleaning rollers 18 to the appropriate position in advance, and increase the distance between it and the other cleaning roller 18. The spring 22 is stretched accordingly to adapt to copper wires of different diameters. Then, pull the copper wire through the two air tubes 10 and finally wind it around the winding assembly 12.

[0032] Then, the annealing furnace 1, motor 6 and winding assembly 12 are started, and the winding speed of winding assembly 12 is adjusted according to the annealing speed of annealing furnace 1. When annealing furnace 1 is running continuous annealing and feeding copper wire, winding assembly 12 continuously winds copper wire. At the same time, the output shaft of motor 6 drives the left rotating shaft 8 to rotate counterclockwise. The left rotating shaft 8 drives the right rotating shaft 8 to rotate counterclockwise together through the pulley assembly 7 to assist in the transmission of copper wire.

[0033] During the annealing, cooling, cleaning, and winding processes, the copper wire passes through the cleaning wheel 18, where the oxide layer on its surface is removed. Simultaneously, the left rotating shaft 8 drives the rotating disk 14 to rotate counter-clockwise, and the locking pin 16 rotates counter-clockwise along with the rotating disk 14. When the locking pin 16 rotates 180 degrees counter-clockwise, it pulls the movable frame 17 to the left to a suitable position. The fixed frame 25 and all its components move left along with the movable frame 17. During this leftward movement, the rack 19 contacts and is stopped by the limiting frame 121, thus stopping the leftward movement. The fixed frame 25 and its other components continue to move left. At this time, the gear 20 actively engages with the rack 19 in the forward direction, driving the cleaning wheel. 18 rotates clockwise, causing the surfaces of the cleaning wheel 18 at different positions to contact the scraper 24, where the scraper 24 removes the accumulated impurities. When the locking post 16 continues to rotate 180 degrees counterclockwise to return to its initial position, it pushes the movable frame 17 to move to the right. The fixed frame 25 and all the components on it move to the right along with the movable frame 17. During the rightward movement, the rack 19 disengages from the limit frame 121. At this time, the cleaning wheel 18 is driven to rotate counterclockwise with the transmission of the copper wire. The gear 20 rotates counterclockwise along with the cleaning wheel 18, actively engaging with the rack 19 in the opposite direction, causing the rack 19 to move to the left to a suitable position, preparing for the next forward engagement of the gear 20 and the rack 19.

[0034] When the copper wire is guided by the upper right guide wheel 5 through the two air pipes 10, the air pump 9 operates to draw in outside air and sends the drawn air into the two air pipes 10. The air is then sprayed out from the two sets of air outlets 11 onto the surface of the copper wire to be wound, thereby drying the residual moisture on the surface of the copper wire and ensuring that the copper wire remains dry before winding.

[0035] After all the copper wires have been processed, shut down the annealing furnace 1, the two cooling components 4, the motor 6, the air pump 9, and the winding component 12.

[0036] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of this invention. Therefore, the scope of this invention should be limited only by the appended claims.

Claims

1. An annealing, cooling, and cleaning apparatus for copper wire processing, characterized in that, The system includes an annealing furnace (1), a cooling pool (2), a water outlet (3), a cooling assembly (4), a wire guide wheel (5), a transmission assembly, a winding assembly (12), a limit frame (121), a connecting plate (13), a movable frame (17), and a cleaning mechanism. The annealing furnace (1) has wire-passing ports on both the upper left and right sides. The cooling pool (2) is installed on the lower right side of the annealing furnace (1). The water outlet (3) is fixed to the lower right front side of the cooling pool (2), and the bottom end of its water outlet channel is flush with the bottom end of the cooling pool (2). Two cooling assemblies (4) are distributed vertically and installed at the rear of the cooling pool (2). The front edge of each cooling assembly (4) is vertically aligned with the rear edge of the cooling pool (2). Each pair of vertically aligned connecting plates (13) forms a group, and there are four groups in total. The four sets of connecting plates (13) are fixed inside the cooling pool (2), and are distributed on the upper left, upper right, lower left and lower right sides. Each wire guide wheel (5) is rotatably connected between each set of connecting plates (13). The transmission assembly is set between the cooling pool (2), the lower left wire guide wheel (5) and the lower right wire guide wheel (5). The winding assembly (12) is set on the right side of the cooling pool (2) through two L-shaped plates. The limiting frame (121) is composed of a vertical rod and a horizontal rod, and is fixed to the bottom of the cooling pool (2). The upper part of the vertical rod is fixedly engaged with the corresponding connecting plate (13). The movable frame (17) is slidably connected to the limiting frame (121). Two cleaning mechanisms for removing the oxide layer on the surface of the copper wire are distributed on the left and right and are set on the movable frame (17).

2. The annealing, cooling, and cleaning apparatus for copper wire processing according to claim 1, characterized in that, The transmission assembly includes a motor (6), a pulley assembly (7), and a rotating shaft (8). Two rotating shafts (8) are distributed on the left and right sides, respectively rotatably connected to the lower left wire guide wheel (5) and the lower right wire guide wheel (5), and pass through the corresponding two sets of connecting plates (13) to rotate with them. The front end of each rotating shaft (8) extends to the outside of the cooling pool (2). The motor (6) is installed on the lower left side of the cooling pool (2), with its output shaft facing backward and fixedly connected to the front end of the left rotating shaft (8). The pulley assembly (7) is located between the front ends of the two rotating shafts (8) and is located outside the cooling pool (2).

3. The annealing, cooling, and cleaning apparatus for copper wire processing according to claim 2, characterized in that, Each cleaning mechanism includes a cleaning wheel (18), connecting rods (21), springs (22), sliding sleeves (23), a drive assembly, a scraper (24), and a fixing frame (25). The first fixing frame (25) is fixed to the movable frame (17). Each pair of adjacent connecting rods (21) forms a group, and there are two groups in total. These groups are fixed to the first fixing frame (25). Each sliding sleeve (23) is slidably connected between each group of connecting rods (21). Each pair of adjacent springs (22) forms a group, and there are two groups in total. Inside the two sliding sleeves (23), each spring (22) is fixedly connected at both ends to the corresponding sliding sleeve (23) and the corresponding connecting rod (21), each cleaning wheel (18) is rotatably connected to each fixed frame (25), and each scraper (24) is fixedly connected to each fixed frame (25) and located on one side of the corresponding cleaning wheel (18) in contact with it. The drive assembly for driving the cleaning wheel (18) to rotate is located between the left rotating shaft (8), the two cleaning wheels (18) and the two fixed frames (25).

4. The annealing, cooling, and cleaning apparatus for copper wire processing according to claim 3, characterized in that, The drive assembly includes a rotating disk (14), a locking pin (16), a rack (19), and a gear (20). The rotating disk (14) is fixed to the rear end of the left rotating shaft (8). The locking pin (16) is fixed to the eccentric position on the rear side of the rotating disk (14) and slides with the movable frame (17). Each rack (19) is slidably connected to each fixed frame (25). Each gear (20) is fixed to each cleaning wheel (18) and meshes with it on the side of the corresponding rack (19).

5. An annealing, cooling, and cleaning apparatus for copper wire processing according to claim 4, characterized in that, It also includes an air pump (9), air pipes (10) and air outlets (11). The air pump (9) is installed in the middle of the right side of the cooling pool (2), with its air outlet facing upward and its air inlet facing downward. Two air pipes (10) are symmetrically distributed and fixed to the air outlet of the air pump (9). Every three air outlets (11) form a group and are fixed to each air pipe (10). The distribution positions of every three air outlets (11) are the front side, the rear side and the bottom side. The highest point of the winding surface of the upper right side thread wheel (5) is higher than the highest point of the lower side air outlet (11) and lower than the lowest point of the front side air outlet (11) and the rear side air outlet (11).

6. The annealing, cooling, and cleaning apparatus for copper wire processing according to claim 5, characterized in that, The upper cooling component (4) is close to the highest water level in the internal area of ​​the cooling pool (2), while the lower cooling component (4) is close to the lowest water level in the internal area of ​​the cooling pool (2).

7. An annealing, cooling, and cleaning apparatus for copper wire processing according to claim 6, characterized in that, The air outlet (11) has a flattened design at one end, and its shape is wide and flat.

8. An annealing, cooling, and cleaning apparatus for copper wire processing according to claim 7, characterized in that, The four racks (19) are respectively aligned with the vertical or horizontal bars of the limit frame (121).

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