Tubular cooler

Abstract

The utility model relates to the field of coolers, and particularly discloses a tubular cooler which comprises a base. The cooler main body is arranged on the base; the connecting device is used for fixing the cooler main body on the base; the connecting device comprises clamping plates symmetrically arranged on the outer wall of the cooler body in a sleeving mode, two connecting supporting plates fixedly connected to the two clamping plates correspondingly, and locking mechanisms used for fixing the two connecting supporting plates into the base correspondingly. The tubular cooler has the effect of improving the fixity and safety of the tubular cooler.

Description

Technical Field

[0001] This application relates to the field of coolers, and more particularly to a tubular cooler. Background Technology

[0002] A cooler is a type of heat exchange equipment used to cool fluids. It typically uses water or air as a coolant to remove heat. They can be mainly classified into shell-and-tube coolers, plate coolers, and air-cooled coolers. Coolers are widely used heat exchange devices in industries such as metallurgy, chemical engineering, energy, transportation, light industry, and food processing. They are suitable for various operating conditions including cooling, condensation, heating, evaporation, and waste heat recovery. Therefore, among the many types of heat exchangers, coolers, especially shell-and-tube heat exchangers, remain important. Shell-and-tube coolers are a common type of cooler. Also called a shell-and-tube cooler, they consist of a tube side and a shell side. The path of the liquid flowing inside the tubes is the tube side, and the path of the liquid flowing outside the tubes is the shell side. The wall surface of the tube bundle is the heat transfer surface.

[0003] Currently, existing shell-and-tube coolers still have shortcomings. There are many types of existing shell-and-tube coolers, most of which are different in style. When using shell-and-tube coolers, the installation is relatively troublesome and the installation steps are relatively complicated. It requires a lot of time and effort from the installers, which causes trouble during installation and thus reduces the effectiveness of existing shell-and-tube coolers. Utility Model Content

[0004] To address the issues of stability and safety of tubular coolers, this application provides a tubular cooler.

[0005] The tubular cooler provided in this application adopts the following technical solution:

[0006] include:

[0007] Base;

[0008] The main body of the cooler is mounted on the base;

[0009] A connecting device for securing the cooler body to the base;

[0010] The connecting device includes symmetrically fitted plates on the outer wall of the cooler body, two connecting support plates fixedly connected to the two plates respectively, and locking mechanisms for fixing the two connecting support plates in the base respectively.

[0011] In one possible implementation, a first cavity is provided in the base, one end of the connecting support plate is inserted into the first cavity, the locking mechanism is located in the first cavity, and the connecting support plate is provided with a locking groove.

[0012] The locking mechanism includes:

[0013] The locking rod is slidably mounted inside the base.

[0014] The first drive assembly is symmetrically arranged in the first cavity and is used to drive the locking rod to be inserted into the locking groove to fix the connecting support plate.

[0015] The second drive assembly is located in the first cavity and between the two first drive assemblies, and is used to drive the lock rod to disengage into the lock groove to unlock the connecting support plate.

[0016] In one possible implementation, the first driving component includes:

[0017] The first connecting plate is symmetrically fixed on the connecting support plate;

[0018] The first rotating rod is rotatably positioned within the first cavity;

[0019] The first gear is symmetrically fixed on the first rotating rod;

[0020] There are two second gears, which are fixedly mounted on the two first rotating rods respectively, and the second gears are located between the two first gears;

[0021] The second connecting plate is slidably disposed within the base;

[0022] The movable block is fixedly mounted on the connecting plate;

[0023] The first reset spring consists of several springs, one end of which is fixedly connected to the first connecting plate, and the other end is fixedly connected to the inner wall of the first cavity.

[0024] The second reset spring has one end fixedly connected to the second connecting plate and the other end fixedly connected to the inner wall of the base;

[0025] The first connecting plate is provided with a first rack that meshes with the first gear, the second connecting plate is provided with a second rack that meshes with the second gear, one end of the movable block abuts against the locking rod, and the movable block is provided with a groove that cooperates with the locking rod.

[0026] In one possible implementation, the locking bar has a first inclined surface at one end near the movable block, and the two ends of the groove have second inclined surfaces that cooperate with the first inclined surface.

[0027] In one possible implementation, a groove is provided on the base, one end of the locking rod passes through the groove and cooperates with the locking groove, one end of the locking rod is fixedly mounted on a connecting ring, and a third return spring is provided on the connecting ring, one end of the third return spring is connected to the inner wall of the groove.

[0028] In one possible implementation, the first driving component further includes:

[0029] The sliders are symmetrically and fixedly mounted on the second connecting plate;

[0030] The base has two grooves that mate with the slider.

[0031] In one possible implementation, the second driving component includes:

[0032] The cylinder is mounted on the inner wall of the first cavity;

[0033] The lifting plate is fixedly mounted on the piston rod of the cylinder;

[0034] The third connecting plate is symmetrically located at both ends of the lifting plate;

[0035] The second rotating rod is symmetrically rotatably disposed within the first cavity;

[0036] The third gear consists of two gears, which are fixedly mounted on the two second rotating rods respectively.

[0037] The fourth gear consists of two gears, each fixedly mounted on one of the two second rotating rods.

[0038] The third connecting plate is provided with a third rack that meshes with the third gear, and the fourth gear is a semi-gear, and the part of the fourth gear with a toothed ring meshes with the second gear.

[0039] In one possible implementation, the second drive component further includes:

[0040] The guide rod is symmetrically inserted through the third connecting plate, and the third connecting plate and the guide rod are slidably fitted together. The two ends of the guide rod are respectively fixed to the inner wall of the first cavity.

[0041] In one possible implementation, the cooler body has an inlet pipe and an outlet pipe at the top. The cooler body has a first cover and a second cover connected to its two ends by flanges. The first cover has a low-temperature inlet pipe and the second cover has a low-temperature outlet pipe. The inner walls of both ends of the cooler body have bundled plates with several through holes. Cooling copper tube bundles are fixedly fitted between the through holes of the bundled plates. One end of the cooling copper tube bundle is connected to the low-temperature inlet pipe through the first cover, and the other end of the cooling copper tube bundle is connected to the low-temperature outlet pipe through the second cover. Alternating bent plates are fixedly fitted on the cooling copper tube bundle.

[0042] In one possible implementation, the outer diameter of the bundle plate is equal to the inner diameter of the cooler body, both outer sides of the bundle plate are flush with the front and rear end faces of the cooler body, the radius of the arc of the bending plate is equal to the radius of the bundle plate, and the bending plate is fitted onto the bundle plate with complementary upper and lower arcs.

[0043] In summary, this application includes the following beneficial technical effects: First, the cooler body is installed on the connecting support plate via a clamping plate. Then, one end of the connecting support plate is inserted into the first cavity, compressing the first return spring. At this time, the first rack and the first gear on the first connecting plate rotate. The first gear drives the second gear to rotate through the first rotating rod. The second gear rotates counterclockwise. The second gear and the second rack cooperate to drive the second connecting plate to move downward, compressing the second return spring. This causes one end of the locking rod to disengage from the groove through the cooperation of the first and second inclined surfaces, compressing the third return spring. Since one end of the locking rod abuts against the end wall of the movable block, the locking rod faces one end of the locking groove until it is inserted into the locking groove, thus locking the connecting support plate and the locking rod, thereby fixing the cooler body and ensuring the stable operation and safety of the cooler body. Conversely, when unlocking is required, the drive cylinder lowers the lifting plate, which in turn moves the third connecting plate. The third rack in the third connecting plate meshes with the third gear, causing the second rotating rod to rotate. The second rotating rod then rotates the fourth gear, causing the toothed portion of the fourth gear to mesh with the second gear (conversely, when the second gear rotates counterclockwise, the portion of the fourth gear without the toothed portion will not mesh with the second gear, thus ensuring the cylinder's lifespan). This causes the second gear to rotate clockwise, moving the second connecting plate upwards. The locking rod, along with the first and second inclined surfaces, enters the groove, disengaging from the locking slot and unlocking the cooler body. This facilitates the disassembly and maintenance of the cooler body. Attached Figure Description

[0044] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0045] Figure 2 This is a cross-sectional schematic diagram of an embodiment, mainly showing the locking mechanism;

[0046] Figure 3 yes Figure 2 An enlarged schematic diagram of part A;

[0047] Figure 4 yes Figure 2 An enlarged schematic diagram of part B;

[0048] Figure 5 yes Figure 3 An enlarged schematic diagram of part C;

[0049] Figure 6 This is a structural schematic diagram as part of an embodiment, mainly showing the second drive component;

[0050] Figure 7 yes Figure 6 An enlarged schematic diagram of part D.

[0051] Reference numerals: 1. Base; 2. Cooler body; 3. Support frame; 4. Inlet pipe; 5. Outlet pipe; 6. First cover; 7. Second cover; 8. Low-temperature inlet pipe; 9. Low-temperature outlet pipe; 10. Bundle plate; 11. Cooling copper tube bundle; 12. Bending plate; 13. Clamping plate; 14. Connecting support plate; 15. First cavity; 16. Locking groove; 17. Locking rod; 18. First connecting plate; 19. First rotating rod; 20. First gear; 21. Second gear; 22. Second connecting plate; 23. 24. Movable block; 25. First return spring; 26. Second return spring; 27. Second cavity; 28. First rack; 29. ​​Second rack; 30. Groove; 31. First inclined plane; 32. Second inclined plane; 33. Slider; 34. Slide groove; 35. Groove body; 36. Connecting ring; 37. Third return spring; 38. Cylinder; 39. Lifting plate; 40. Guide rod; 41. Third connecting plate; 42. Second rotating rod; 43. Third gear; 44. Fourth gear; 45. Third rack. Detailed Implementation

[0052] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0053] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0054] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0055] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] Reference Figure 1-7A tubular cooler includes a base 1, a cooler body 2, a support frame 3, and a connecting device. The cooler body 2 is detached and mounted on the base 1 via the connecting device. The support frame 3 is symmetrically mounted on the base 1 and has threaded holes for connection to the outside. The top of the cooler body 2 has an inlet pipe 4 and an outlet pipe 5. The two ends of the cooler body 2 are respectively connected to a first cover 6 and a second cover 7 via flanges. The first cover 6 has a low-temperature inlet pipe 8, and the second cover 7 has a low-temperature outlet pipe 9. The inner walls of both ends of the cooler body 2 are provided with bundled plates 10. The bundled plates 10 have several through holes. Cooling copper tube bundles 11 are fixedly fitted between the through holes of the bundled plates 10. One end of the cooling copper tube bundle 11 is connected to the low-temperature inlet pipe 8 through the first cover 6, and the other end of the cooling copper tube bundle 11 is connected to the low-temperature outlet pipe 9 through the second cover 7. Alternating bent plates 12 are fixedly fitted on the cooling copper tube bundle 11.

[0057] The outer diameter of the bundle plate 10 is equal to the inner diameter of the cooler body 2. Both outer surfaces of the bundle plate 10 are flush with the front and rear end faces of the cooler body 2. The radius of the arc of the bending plate 12 is equal to the radius of the bundle plate 10. The bending plate 12 is fitted onto the bundle plate 10 with complementary upper and lower arcs.

[0058] The connecting device includes a clamping plate 13, a connecting support plate 14, and a locking mechanism. The clamping plate 13 is symmetrically sleeved on the outer wall of the cooler body 2. One end of the clamping plate 13 is hinged to the connecting support plate 14, and the other end is bolted to the connecting support plate 14. Specifically, a first cavity 15 is provided in the base 1. One end of the connecting support plate 14 is inserted into the first cavity 15. The locking mechanism is located in the first cavity 15. The connecting support plate 14 is provided with a locking groove 16. The locking mechanism includes a locking rod 17, a first driving assembly, and a second driving assembly. The locking rod 17 is slidably disposed in the base 1. The first driving assembly is symmetrically disposed in the first cavity 15 and is used to drive the locking rod 17 to insert into the locking groove 16 to fix the connecting support plate 14. The second driving assembly is disposed in the first cavity 15 and located between the two first driving assemblies, and is used to drive the locking rod 17 to disengage into the locking groove 16 to unlock the connecting support plate 14.

[0059] The first drive assembly includes a first connecting plate 18, a first rotating rod 19, a first gear 20, a second gear 21, a second connecting plate 22, a movable block 23, a first return spring 24, and a second return spring 25. A second cavity 26 communicating with the first cavity 15 is provided inside the base 1. The first connecting plate 18 is symmetrically fixed on the connecting support plate 14 and is located within the first cavity 15. The first rotating rod 19 is rotatably disposed within the first cavity 15, and the first gear 20 is symmetrically fixed on the first rotating rod 19. On the base 1, there are two second gears 21, which are fixedly mounted on the two first rotating rods 19 respectively, and the second gears 21 are located between the two first gears 20. The second connecting plate 22 is slidably mounted in the second cavity 26. The movable block 23 is fixedly mounted on the connecting plate. There are several first return springs 24, one end of which is fixedly connected to the first connecting plate 18, and the other end is fixedly connected to the inner wall of the first cavity 15. The second return spring 25 is fixedly connected to the second connecting plate 22 at one end and to the inner wall of the base 1 at the other end. The first connecting plate 18 is provided with a first rack 27 that meshes with the first gear 20, and the second connecting plate 22 is provided with a second rack 28 that meshes with the second gear 21. One end of the movable block 23 abuts against the locking rod 17, and the movable block 23 is provided with a groove 29 that cooperates with the locking rod 17.

[0060] The locking rod 17 has a first inclined surface 30 at one end near the movable block 23, and the groove 29 has a second inclined surface 31 at both ends that cooperate with the first inclined surface 30.

[0061] The first drive assembly also includes a slider 32 and a groove 33; the slider 32 is symmetrically fixed on the second connecting plate 22, and the base 1 has two grooves 33 that cooperate with the slider 32. This provides stability when the second connecting plate 22 moves.

[0062] The base 1 has a groove 34, the locking rod 17 is located in the groove 34, and one end of the locking rod 17 passes through the groove 34 and cooperates with the locking groove 16. One end of the locking rod 17 is fixed to the connecting ring 35, and the connecting ring 35 is provided with a third return spring 36. One end of the third return spring 36 is connected to the inner wall of the groove 34.

[0063] The second drive assembly includes a cylinder 37, a lifting plate 38, a guide rod 39, a third connecting plate 40, a second rotating rod 41, a third gear 42, a fourth gear 43, and a controller. The cylinder 37 is mounted on the inner wall of the first cavity 15. The lifting plate 38 is fixedly mounted on the piston rod of the cylinder 37. The guide rod 39 symmetrically passes through the third connecting plate 40, and the third connecting plate 40 and the guide rod 39 are in sliding engagement. Both ends of the guide rod 39 are fixedly connected to the inner wall of the first cavity 15. The third connecting plate 40 is symmetrically positioned on both ends of the lifting plate 38. The second rotating rod 41 is symmetrically rotated within the first cavity 15. There are two third gears 42, each fixedly mounted on one of the two second rotating rods 41. There are two fourth gears 43, each fixedly mounted on one of the two second rotating rods 41. The controller is located on the outer wall of the base 1 and is electrically connected to the cylinder 37. The controller is existing technology and can be a PC control board, so it will not be described in detail. The third connecting plate 40 is provided with a third rack 44 that meshes with the third gear 42, and the fourth gear 43 is a semi-gear, and the part of the fourth gear 43 with a toothed ring meshes with the second gear 21.

[0064] The specific operation process is as follows:

[0065] First, the cooler body 2 is installed on the connecting support plate 14 via the clamping plate 13. Then, one end of the connecting support plate 14 is inserted into the first cavity 15, compressing the first return spring 24. At this time, the first rack 27 and the first gear 20 on the first connecting plate 18 rotate. The first gear 20 drives the second gear 21 to rotate via the first rotating rod 19. The second gear 21 rotates counterclockwise. The second gear 21 cooperates with the second rack 28, driving the second connecting plate 22 to move downward, compressing the second return spring 25. This causes one end of the locking rod 17 to disengage from the groove 29 through the cooperation of the first inclined surface 30 and the second inclined surface 31, compressing the third return spring 36. Since one end of the locking rod 17 abuts against the end wall of the movable block 23, the locking rod 17 faces the locking groove 16 until it is inserted into the locking groove 16, so that the connecting support plate 14 and the locking rod 17 form a locked state, thereby fixing the cooler body 2, ensuring the stable operation of the cooler body 2 and guaranteeing safety. Conversely, when unlocking is required, the drive cylinder 37 lowers the lifting plate 38, which in turn drives the third connecting plate 40. The third rack 44 in the third connecting plate 40 meshes with the third gear 42, causing the second rotating rod 41 to rotate. The second rotating rod 41 then drives the fourth gear 43 to rotate, causing the part of the fourth gear 43 with the toothed ring to mesh with the second gear 21 (conversely, when the second gear 21 rotates counterclockwise, the part of the fourth gear 43 without the toothed ring will not mesh with the second gear 21, thus ensuring the service life of the cylinder 37). This causes the second gear 21 to rotate clockwise, which in turn drives the second connecting plate 22 to move upward. This allows the locking rod 17, along with the first inclined surface 30 and the second inclined surface 31, to enter the groove 29, disengaging the locking rod 17 from the locking groove 16 and unlocking the cooler body 2. This facilitates the disassembly of the cooler body 2 and, consequently, the maintenance of the cooler body 2.

[0066] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0067] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A tubular cooler, comprising: Base (1); The main body of the cooler (2) is mounted on the base (1); Its features are: The tubular cooler also includes: A connecting device for fixing the cooler body (2) onto the base (1); The connecting device includes a clamping plate (13) symmetrically sleeved on the outer wall of the cooler body (2), two connecting support plates (14) respectively fixedly connected to the two clamping plates (13), and a locking mechanism for fixing the two connecting support plates (14) in the base (1).

2. The tubular cooler according to claim 1, characterized in that: The base (1) has a first cavity (15) inside, one end of the connecting support plate (14) is inserted into the first cavity (15), the locking mechanism is located in the first cavity (15), and the connecting support plate (14) has a locking groove (16). The locking mechanism includes: The locking rod (17) is slidably disposed within the base (1); The first driving component is symmetrically disposed in the first cavity (15) and is used to drive the locking rod (17) to be inserted into the locking groove (16) to fix the connecting support plate (14); The second drive assembly is disposed in the first cavity (15) and located between the two first drive assemblies, for driving the locking rod (17) to disengage into the locking groove (16) to unlock the connecting support plate (14).

3. The tubular cooler according to claim 2, characterized in that: The first driving component includes: The first connecting plate (18) is symmetrically fixed on the connecting support plate (14); The first rotating rod (19) is rotatably disposed within the first cavity (15); The first gear (20) is symmetrically fixed on the first rotating rod (19); There are two second gears (21), which are fixed on the two first rotating rods (19) respectively, and the second gears (21) are located between the two first gears (20); The second connecting plate (22) is slidably disposed within the base (1); Movable block (23) is fixedly mounted on the connecting plate; The first reset spring (24) consists of several springs, one end of which is fixedly connected to the first connecting plate (18), and the other end is fixedly connected to the inner wall of the first cavity (15). The second return spring (25) is fixedly connected at one end to the second connecting plate (22) and at the other end to the inner wall of the base (1); The first connecting plate (18) is provided with a first rack (27) that meshes with the first gear (20), the second connecting plate (22) is provided with a second rack (28) that meshes with the second gear (21), one end of the movable block (23) abuts against the locking rod (17), and the movable block (23) is provided with a groove (29) that cooperates with the locking rod (17).

4. The tubular cooler according to claim 3, characterized in that: The locking rod (17) has a first inclined surface (30) at one end near the movable block (23), and the groove (29) has a second inclined surface (31) at both ends that cooperates with the first inclined surface (30).

5. The tubular cooler according to claim 4, characterized in that: The base (1) has a groove (34) and one end of the locking rod (17) passes through the groove (34) and cooperates with the locking groove (16). One end of the locking rod (17) is fixed to the connecting ring (35). The connecting ring (35) is provided with a third return spring (36) and one end of the third return spring (36) is connected to the inner wall of the groove (34).

6. The tubular cooler according to claim 3, characterized in that: The first driving component also includes: The slider (32) is symmetrically fixed on the second connecting plate (22); The base (1) has two grooves (33) that cooperate with the slider (32).

7. The tubular cooler according to claim 3, characterized in that: The second driving component includes: Cylinder (37) is installed on the inner wall of the first cavity (15); The lifting plate (38) is fixedly mounted on the piston rod of the cylinder (37); The third connecting plate (40) is symmetrically arranged on both ends of the lifting plate (38); The second rotating rod (41) is symmetrically rotated within the first cavity (15); There are two third gears (42), which are fixed on the two second rotating rods (41) respectively; The fourth gear (43) consists of two gears, which are fixedly mounted on the two second rotating rods (41) respectively; The third connecting plate (40) is provided with a third rack (44) that meshes with the third gear (42), and the fourth gear (43) is a semi-gear, and the part of the fourth gear (43) with a toothed ring meshes with the second gear (21).

8. The tubular cooler according to claim 7, characterized in that: The second driving component also includes: The guide rod (39) is symmetrically inserted through the third connecting plate (40), and the third connecting plate (40) and the guide rod (39) are slidably engaged. The two ends of the guide rod (39) are respectively fixed to the inner wall of the first cavity (15).

9. The tubular cooler according to claim 1, characterized in that: The cooler body (2) has an inlet pipe (4) and an outlet pipe (5) at the top. The cooler body (2) is connected to a first cover (6) and a second cover (7) at both ends by flanges. The first cover (6) is provided with a low-temperature inlet pipe (8), and the second cover (7) is provided with a low-temperature outlet pipe (9). The cooler body (2) has a bundle plate (10) on the inner wall at both ends. The bundle plate (10) has several through holes. Cooling copper tube bundles (11) are fixedly fitted between the through holes of the bundle plate (10). One end of the cooling copper tube bundle (11) is connected to the low-temperature inlet pipe (8) through the first cover (6), and the other end of the cooling copper tube bundle (11) is connected to the low-temperature outlet pipe (9) through the second cover (7). Alternating bent plates (12) are fixedly fitted on the cooling copper tube bundle (11).

10. The tubular cooler according to claim 9, characterized in that: The outer diameter of the bundle plate (10) is equal to the inner diameter of the cooler body (2). Both outer surfaces of the bundle plate (10) are flush with the front and rear end faces of the cooler body (2). The radius of the arc of the bending plate (12) is equal to the radius of the bundle plate (10). The bending plate (12) is fitted onto the bundle plate (10) with complementary upper and lower arcs.

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