Automobile brake lining hot-pressing mold convenient to demold

Abstract

The invention provides an automotive brake lining hot-pressing mold convenient to demold, and relates to the field of automotive brake lining production. The automobile brake lining hot-pressing mold convenient to demold comprises an equal-ratio hot press, the equal-ratio hot press comprises a rack, a mold containing frame is fixedly installed in the middle of the rack, the upper side and the lower side, located on the mold containing frame, of the rack are provided with an upper extrusion plate and a lower extrusion plate which can move oppositely respectively, and the upper extrusion plate can slide front and back. According to the automotive brake lining hot-pressing mold convenient to demold, a friction material is placed in the inner shell, a back plate is placed on the uppermost portion of the inner shell, hot pressing of an automotive brake lining can be achieved through heating of a heating pipe in cooperation with extrusion of an upper extrusion plate and a lower extrusion plate, after hot pressing is completed, the heating pipe stops heating, and the friction material is placed in the inner shell. And the extension pipe supplies air to the cooling flow channel through an external air supply mechanism to accelerate heat discharge, so that the automobile brake lining can be cooled, and bonding demolding failure caused by high temperature during demolding can be avoided.

Description

Technical Field

[0001] The invention relates to the field of automobile brake lining production, in particular to an automobile brake lining hot pressing mold which is easy to demould. Background Art

[0002] Automobile brake linings are composed of friction materials and adhesives. When braking, they are squeezed against the brake disc or brake drum to generate friction, thereby achieving the purpose of deceleration and braking of the vehicle.

[0003] The existing patent discloses (CN214522207U) a motorcycle brake shoe die die with good stability, comprising a lower die plate, a positioning rod is arranged at the upper end of the lower die plate, an upper die plate is arranged outside the positioning rod, an upper die seat is arranged at the bottom end of the upper die plate, a lower die seat is arranged at the top end of the lower die plate, a docking block is arranged at the bottom end of the upper die seat, a docking groove is arranged at the top end of the lower die seat, a groove is arranged inside the lower die plate, a mounting plate is arranged inside the groove, an elastic column is arranged at the bottom end of the mounting plate, and a spring is arranged on the outer wall of the elastic column;

[0004] The motorcycle brake shoe die die with good stability can effectively play a limiting role by setting a docking block and a docking groove, thereby ensuring the accuracy of the docking between the upper die seat and the lower die seat, avoiding the problem of poor brake shoe molding quality caused by the skewness of the docking between the upper die seat and the lower die seat, and preventing the waste of the brake shoe. Since the automobile brake lining adopts a hot pressing process, the main reason for the difficulty in demoulding the friction block is that the temperature decreases slowly and does not reach the appropriate demoulding temperature. At the same time, the residue and the attached demoulding agent mixed with the raw materials make the connection of the raw material contact part unstable and prone to demoulding failure. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a hot pressing mold for automobile brake linings that is easy to demould, thereby solving the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a hot pressing mold for automobile brake linings that is easy to demold, including a proportional hot press, the proportional hot press including a frame, a mold placement frame is fixedly installed in the middle of the frame, the frame is located on the upper and lower sides of the mold placement frame, and an upper extrusion plate and a lower extrusion plate that can move toward each other are respectively provided, wherein the upper extrusion plate can slide back and forth, a notch is provided above the frame, a guide rail is provided above the proportional hot press, and at least a cleaning mechanism that can clean the mold placement frame through the notch is slidably connected above the guide rail, and a bearing groove is provided on the surface of the mold placement frame, and the inner part of the bearing groove is passed through A mold cavity is fixedly connected by countersunk bolts, and the mold cavity is divided into an outer shell and an inner shell. The inner shell is sleeved inside the outer shell from the bottom of the outer shell, and the lower extrusion plate portion extends to the inside of the inner shell and is slidably connected to the inner shell. A spirally distributed heating tube is fixedly wound on the outer surface of the inner shell, and both ends of the heating tube extend to the outer surface of the outer shell. A cooling channel is wound in the gap of the heating tube on the outer surface of the inner shell. The inlet ends of multiple groups of cooling channels are connected through a connecting block, and another connecting block is connected to the outlet ends of multiple groups of cooling channels. One end of the connecting block is connected and penetrated by a connecting pipe, which extends to the outer surface of the outer shell, and the gap between the outer shell and the inner shell is filled with heat-conducting material.

[0007] Preferably, a cavity for accommodating the sliding of the automobile brake lining back plate is provided above the inner shell, and a cavity for accommodating the sliding of the lower extrusion plate is provided above the inner shell, and an angle of three degrees is set between the two side cavities, which opens upward from the bottom end and tilts outward.

[0008] Preferably, metal sheets are provided at both ends of the heating tube, an outer ring of the metal sheet is provided with an insulating layer, the metal sheet and the insulating layer are embedded in the interior of the shell, and a sealing ring is embedded in the inner ring of the connecting tube.

[0009] Preferably, both sides of the mold placement frame are provided with plug-in grooves connected to and passing through the bearing grooves, the interior of the plug-in grooves is slidably connected with a sliding slider, the middle of the sliding slider is fixedly connected with an extension tube plugged into the inside of the sealing ring, and a wire with a contact end set at one end, and the wire is in contact with the metal sheet.

[0010] Preferably, telescopic sleeves extending downward are fixedly installed at the four upper corners of the frame, the free ends of the telescopic sleeves are fixedly connected via a "U"-shaped slide groove, the upper extrusion plate is slidably connected inside the slide groove, a telescopic hydraulic cylinder extending upward is fixedly installed at the bottom end of the frame, the lower extrusion plate is fixedly installed at the free end of the telescopic hydraulic cylinder, and an extension groove carrying the upper extrusion plate is fixedly installed at the rear end of the frame, and the extension groove is aligned with the slide groove.

[0011] Preferably, an upper protrusion covering the back plate of the automobile brake lining is provided below the upper extrusion plate, and a lower protrusion slidably connected to the inner shell is provided above the lower extrusion plate, and the edge of the lower protrusion is in contact with the inner edge below the inner shell.

[0012] Preferably, the cleaning mechanism includes a horizontal moving mechanism that moves along the guide rail, a vertical moving mechanism is fixedly installed on the bottom end of the horizontal moving mechanism, a connecting plate is fixedly installed on the bottom end of the vertical moving mechanism, a blowing mechanism is fixedly installed on the connecting plate, the output end of the blowing mechanism is connected to and penetrated by a blowing pipe, a dust suction mechanism is fixedly installed on the connecting plate, the output end of the dust suction mechanism is connected to and penetrated by a dust suction pipe, a spray mechanism is fixedly installed on the connecting plate, and the output end of the spray mechanism is connected to and penetrated by a spray pipe.

[0013] Preferably, the dust suction pipe is located below the blowing pipe, and the spray pipe is located above the blowing pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The automobile brake lining hot pressing mold which is easy to demold places the friction material inside the inner shell and places the back plate on the top of the inner shell. The automobile brake lining is hot pressed by heating the heating tube in combination with the extrusion of the upper extrusion plate and the lower extrusion plate. After the hot pressing is completed, the heating tube stops heating, and the extension tube supplies air to the cooling channel through the external air supply mechanism to accelerate the heat discharge, thereby cooling the automobile brake lining, thereby avoiding the failure of bonding and demolding caused by high temperature during demolding.

[0016] 2. The hot pressing mold for automobile brake linings which is easy to demould, the upper extrusion plate is reset and moved to the top of the extension groove under the action of external force, the cleaning mechanism first uses high-speed airflow to flush the inner shell to remove the residue, and then transfers the residue to the outside of the inner shell through the dust suction mechanism, and finally sprays the demoulding agent through the spray pipe to prevent the residue from affecting the demoulding.

[0017] 3. The automobile brake lining hot pressing mold which is easy to demould has a cavity for accommodating the sliding of the automobile brake lining back plate on the upper part of the inner shell, and a cavity for accommodating the sliding of the lower extrusion plate on the upper part of the inner shell. An angle of three degrees is set between the cavities on both sides, which is opened from the bottom to the top and inclined outward by three degrees. By setting the camber angle, demoulding from bottom to top can be facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cleaning mechanism of the present invention;

[0020] Figure 3 It is a schematic diagram of the isometric hot press of the present invention;

[0021] Figure 4 It is a schematic diagram of the mold placement frame of the present invention;

[0022] Figure 5 A half-section schematic diagram of the mold cavity of the present invention;

[0023] Figure 6 This is a schematic diagram of the connection of the heating tube of the present invention;

[0024] Figure 7 This is a schematic diagram of the cooling channel connection of the present invention;

[0025] Figure 8 This is a schematic diagram of the connection of the sliding block of the present invention;

[0026] Fig. 9 It is a schematic diagram of the upper protrusion connection of the present invention;

[0027] Fig.10 It is a schematic diagram of the lower protrusion connection of the present invention.

[0028] In the figure: 1. isometric hot press; 11. frame; 12. mold placement frame; 13. lower extrusion plate; 14. notch; 15. upper extrusion plate; 2. guide rail; 3. cleaning mechanism; 121. bearing groove; 122. mold cavity; 123. outer shell; 124. inner shell; 125. heating pipe; 126. cooling channel; 127. connecting block; 128. countersunk bolt; 129. connecting pipe; 21. metal sheet; 22. sealing ring; 4. sliding slider; 5. extension pipe; 6. wire; 7. telescopic sleeve; 8. slide groove; 9. telescopic hydraulic cylinder; 10. extension groove; 23. upper protrusion; 24. lower protrusion; 31. horizontal moving mechanism; 32. vertical moving mechanism; 33. connecting plate; 34. blowing mechanism; 35. blowing pipe; 36. dust suction mechanism; 37. dust suction pipe; 38. spray mechanism; 39. spray pipe. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] like Figure 1-10 As shown, a hot pressing mold for automobile brake linings that is easy to demould comprises a proportional hot press machine 1, which comprises a frame 11, a mold placement frame 12 is fixedly installed in the middle of the frame 11, and an upper extrusion plate 15 and a lower extrusion plate 13 that can move toward each other are respectively arranged on the upper and lower sides of the frame 11 located on the mold placement frame 12, wherein the upper extrusion plate 15 can slide forward and backward, and a notch 14 is provided above the frame 11, and a guide rail 2 is provided above the proportional hot press machine 1, and at least a cleaning mechanism 3 that can clean the mold placement frame 12 through the notch 14 is slidably connected above the guide rail 2, and a bearing groove 121 is provided on the surface of the mold placement frame 12, and a mold cavity 122 is fixedly connected to the inside of the bearing groove 121 through a countersunk bolt 128, and the mold cavity 122 is divided into a shell 123 and The inner shell 124 is sleeved inside the outer shell 123 from the bottom of the outer shell 123, the lower extrusion plate 13 partially extends to the inside of the inner shell 124 and is slidably connected to the inner shell 124, the outer surface of the inner shell 124 is fixedly wound with a spirally distributed heating tube 125, both ends of the heating tube 125 extend to the outer surface of the outer shell 123, the outer surface of the inner shell 124 is located in the gap of the heating tube 125 and is wound with a cooling channel 126, the inlet ends of multiple groups of cooling channels 126 are connected through a connecting block 127, another connecting block 127 is connected to the outlet ends of multiple groups of cooling channels 126, one end of the connecting block 127 is connected and penetrated by a connecting pipe 129, the connecting pipe 129 extends to the outer surface of the outer shell 123, and the gap between the outer shell 123 and the inner shell 124 is filled with heat-conducting material.

[0034] A cavity for accommodating the sliding of the back plate of the automobile brake lining is arranged above the inner shell 124, and a cavity for accommodating the sliding of the lower extrusion plate 13 is arranged above the inner shell 124. An angle of three degrees is set between the cavities on both sides, which is opened from the bottom to the top and inclined outward by three degrees. By setting the camber angle, demoulding from bottom to top can be facilitated.

[0035] Metal sheets 21 are provided at both ends of the heating tube 125, and an insulating layer is provided on the outer circle of the metal sheet 21. Such a setting can facilitate the connection of the heating tube 125 with the existing power supply device. The metal sheet 21 and the insulating layer are embedded in the inside of the outer shell 123, and a sealing ring 22 is embedded in the inner circle of the connecting tube 129. The setting of the sealing ring 22 can facilitate the connection of the connecting tube 129 with the existing gas supply mechanism.

[0036] Both sides of the mold placement frame 12 are provided with plug-in slots that are connected to and pass through the bearing slot 121. The inside of the plug-in slot is slidably connected with a sliding slider 4, which is connected to the mold placement frame 12 through bolts. The middle part of the sliding slider 4 is fixedly connected with an extension tube 5 that is plugged into the inside of the sealing ring 22, and a wire 6 with a contact end at one end. The wire 6 is in contact with the metal sheet 21. Through such a setting, it can be ensured that after the mold cavity 122 is placed in the mold placement frame 12, the connection is achieved through positioning after sliding contact, which facilitates the replacement of the mold cavity 122.

[0037] The four upper corners of the frame 11 are fixedly installed with downwardly extending telescopic sleeves 7, the free ends of the telescopic sleeves 7 are fixedly connected by a "U"-shaped slide groove 8, and the upper extrusion plate 15 is slidably connected inside the slide groove 8. The bottom end of the frame 11 is fixedly installed with an upwardly extending telescopic hydraulic cylinder 9, and the lower extrusion plate 13 is fixedly installed on the free end of the telescopic hydraulic cylinder 9. The rear end of the frame 11 is fixedly installed with an extension groove 10 that carries the upper extrusion plate 15, and the extension groove 10 is aligned with the slide groove 8. Through such an arrangement, a relatively simple extrusion device that allows the upper extrusion plate 15 and the lower extrusion plate 13 to move toward each other can be provided.

[0038] An upper protrusion 23 covering the back plate of the automobile brake lining is arranged below the upper extrusion plate 15, and a lower protrusion 24 slidably connected to the inside of the inner shell 124 is arranged above the lower extrusion plate 13. The edge of the lower protrusion 24 is in contact with the inner edge of the bottom of the inner shell 124. This arrangement ensures that the automobile brake lining can be squeezed.

[0039] The cleaning mechanism 3 includes a horizontal moving mechanism 31 that moves along the guide rail 2, a vertical moving mechanism 32 is fixedly installed at the bottom end of the horizontal moving mechanism 31, a connecting plate 33 is fixedly installed at the bottom end of the vertical moving mechanism 32, a blowing mechanism 34 is fixedly installed on the connecting plate 33, the output end of the blowing mechanism 34 is connected to and penetrated by a blowing pipe 35, a dust suction mechanism 36 is fixedly installed on the connecting plate 33, the output end of the dust suction mechanism 36 is connected to and penetrated by a dust suction pipe 37, a spray mechanism 38 is fixedly installed on the connecting plate 33, and the output end of the spray mechanism 38 is connected to and penetrated by a spray pipe 39. First, a high-speed airflow is rushed to the mold cavity 122 through the blowing mechanism 34 to make the residual waste slag fall off, and then the waste slag is sucked away through the dust suction pipe 37, and finally the release agent is sprayed again, so as to avoid the residual waste slag affecting the demolding.

[0040] The dust suction pipe 37 is located below the blowing pipe 35, and the spray pipe 39 is located above the blowing pipe 35. The dust suction pipe 37 needs to contact the bottom wall of the mold cavity 122 and is therefore set at the lowest position. The spray pipe 39 can spray from a high position because the mold release agent sprayed out can flow.

[0041] The dust suction pipe 37 , the blowing pipe 35 and the spraying pipe 39 are all provided with a plurality of branch pipes, and the number of the branch pipes is the same as the number of the bearing slots 121 . Through such an arrangement, all the mold cavities 122 can be cleaned.

[0042] When in use, the friction material is placed inside the inner shell 124, and the back plate is placed at the top of the inner shell 124. The heating tube 125 is heated and the upper extrusion plate 15 and the lower extrusion plate 13 are extruded to achieve hot pressing of the automobile brake lining. After the hot pressing is completed, the heating tube 125 stops heating, and the extension tube 5 supplies air to the cooling channel 126 through an external air supply mechanism to accelerate heat discharge, thereby cooling the automobile brake lining, thereby avoiding high temperature causing bonding and demolding failure during demolding.

[0043] After use, the upper extrusion plate 15 is reset and moved to the top of the extension groove 10 under the action of external force. The cleaning mechanism 3 first uses high-speed airflow to flush the inner shell 124 to remove the residue, and then transfers the residue to the outside of the inner shell 124 through the dust suction mechanism 36. Finally, the release agent is sprayed through the spray pipe 39 to prevent the residue from affecting the demolding.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0045] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot pressing mold for automobile brake linings that is easy to demould, comprising a constant ratio hot pressing machine (1), characterized in that: The isobaric hot press (1) comprises a frame (11), a mold placement frame (12) is fixedly installed in the middle of the frame (11), an upper extrusion plate (15) and a lower extrusion plate (13) which can move towards each other are respectively arranged on the upper and lower sides of the frame (11) located on the mold placement frame (12), wherein the upper extrusion plate (15) can slide forward and backward, a notch (14) is provided above the frame (11), a guide rail (2) is arranged above the isobaric hot press (1), and at least a cleaning mechanism (3) which can clean the mold placement frame (12) through the notch is slidably connected above the guide rail (2); A bearing groove (121) is provided on the surface of the mold placement frame (12), and the interior of the bearing groove (121) is fixedly connected to the mold cavity (122) via a countersunk bolt (128); The mold cavity (122) is divided into an outer shell (123) and an inner shell (124). The inner shell (124) is sleeved inside the outer shell (123) from the bottom of the outer shell (123). The lower extrusion plate (13) partially extends into the inner shell (124) and is slidably connected to the inner shell (124). A spirally distributed heating tube (125) is fixedly wound around the outer surface of the inner shell (124). Both ends of the heating tube (125) extend to the outer surface of the outer shell (123). A cooling channel (126) is wound in the gap of the heating tube (125) on the surface, the inlet ends of the multiple groups of cooling channels (126) are connected through a connecting block (127), another connecting block (127) is connected to the outlet ends of the multiple groups of cooling channels (126), one end of the connecting block (127) is connected and penetrated by a connecting pipe (129), the connecting pipe (129) extends to the outer surface of the outer shell (123), and the gap between the outer shell (123) and the inner shell (124) is filled with heat conductive material.

2. The hot pressing mold for automobile brake linings that is easy to demould according to claim 1 is characterized in that: A cavity for accommodating the sliding of the automobile brake lining back plate is arranged above the inner shell (124), and a cavity for accommodating the sliding of the lower extrusion plate (13) is arranged above the inner shell (124). An angle of three degrees is set between the two side cavities, which are opened upward from the bottom end.

3. The hot pressing mold for automobile brake linings that is easy to demould according to claim 2, characterized in that: Metal sheets (21) are provided at both ends of the heating tube (125), an outer ring of the metal sheet (21) is provided with an insulating layer, the metal sheet (21) and the insulating layer are embedded in the interior of the outer shell (123), and a sealing ring (22) is embedded in the inner ring of the connecting tube (129).

4. The hot pressing mold for automobile brake linings that is easy to demould according to claim 3 is characterized in that: Both sides of the mold placement frame (12) are provided with plug-in slots connected to and penetrating the bearing slot (121); a sliding slider (4) is slidably connected inside the plug-in slot; an extension tube (5) plugged into the inside of the sealing ring (22) is fixedly connected to the middle of the sliding slider (4); and a wire (6) with a contact end at one end is provided, and the wire (6) is in contact with the metal sheet (21).

5. The automobile brake lining hot pressing mold that is easy to demould according to claim 4 is characterized in that: The four upper corners of the frame (11) are fixedly mounted with telescopic sleeves (7) extending downwards, the free end of the telescopic sleeves (7) is fixedly connected via a U-shaped slide groove (8), the upper extrusion plate (15) is slidably connected inside the slide groove (8), the bottom end of the frame (11) is fixedly mounted with a telescopic hydraulic cylinder (9) extending upwards, the lower extrusion plate (13) is fixedly mounted on the free end of the telescopic hydraulic cylinder (9), the rear end of the frame (11) is fixedly mounted with an extension groove (10) carrying the upper extrusion plate (15), and the extension groove (10) is aligned with the slide groove (8).

6. The automobile brake lining hot pressing mold that is easy to demould according to claim 5 is characterized in that: An upper protrusion (23) covering the back plate of the automobile brake lining is arranged below the upper extrusion plate (15), and a lower protrusion (24) slidably connected to the inside of the inner shell (124) is arranged above the lower extrusion plate (13), and the edge of the lower protrusion (24) is in contact with the inner edge of the lower part of the inner shell (124).

7. The automobile brake lining hot pressing mold that is easy to demould according to claim 6 is characterized in that: The cleaning mechanism (3) comprises a horizontal moving mechanism (31) moving along the guide rail (2); a vertical moving mechanism (32) is fixedly mounted on the bottom end of the horizontal moving mechanism (31); a connecting plate (33) is fixedly mounted on the bottom end of the vertical moving mechanism (32); a blowing mechanism (34) is fixedly mounted on the connecting plate (33); an output end of the blowing mechanism (34) is connected to and penetrated by a blowing pipe (35); a dust suction mechanism (36) is fixedly mounted on the connecting plate (33); an output end of the dust suction mechanism (36) is connected to and penetrated by a dust suction pipe (37); a spraying mechanism (38) is fixedly mounted on the connecting plate (33); an output end of the spraying mechanism (38) is connected to and penetrated by a spraying pipe (39).

8. The automobile brake lining hot pressing mold that is easy to demould according to claim 7 is characterized in that: The dust suction pipe (37) is located below the blowing pipe (35), and the spray pipe (39) is located above the blowing pipe (35).

9. The automobile brake lining hot pressing mold that is easy to demould according to claim 8, characterized in that: The dust suction pipe (37), the blowing pipe (35) and the spray pipe (39) are all provided with a plurality of branch pipes, and the number of the branch pipes is the same as the number of the bearing slots (121).

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