A light alloy motor housing casting equipment

Abstract

The present invention belongs to the technical field of alloy casting, and discloses a casting device for a light alloy motor housing, including a base; two movable components; two cleaning components; a mold forming component; a blanking component; a feeding component; a casting component and a locking component. By installing a pneumatic locking component, when the heat absorption block is heated, it will pressurize the air in the ventilation pipe. The pressurized air enters the circular shell, and will push the push rod to the left. The push rod with a conical head will compress the stroke of the spring and extrude multiple steel balls, which are annularly clamped in the fixed ring to form a self-locking structure, further increasing the merging tightness between the two molds. When the molten metal in the cavity cools slightly and the temperature drops, when the thrust of the hot air in the circular shell is less than the elastic force of the spring, the push rod moves to the right, and the multiple steel balls are disengaged from the connection with the fixed ring, solving the problem that the mold will deform due to thermal expansion, and this deformation may cause gaps at the mold clamping position.

Description

Technical Field

[0001] The present invention belongs to the technical field of alloy casting, and specifically relates to a casting device for a light alloy motor housing. Background Art

[0002] The motor housing is an important part of the motor, which is directly related to the quality and lifespan of the motor. The outside needs to be protected by a hard housing, while the internal rotor needs to dissipate heat during operation. The motor housing cast with aluminum alloy, a light alloy, as the raw material is widely used because of its high strength, light weight, and good heat dissipation. In the casting of the motor housing, the low-pressure casting method is usually used. After the two-part mold is closed, the molten metal liquid enters the casting head along the riser pipe and smoothly enters the cavity formed by the combination of the molds until the molten metal liquid is filled and completely solidified. Then, the connection between the molds is released, and the casting is taken out.

[0003] However, when the molten metal liquid enters the mold, since the temperature of the metal liquid is much higher than that of the mold, heat transfer from the metal liquid to the mold will occur. Moreover, the metal liquid continuously rises from the bottom, and the heat received by the bottom of the mold is greater than that of the upper part, resulting in uneven heat transfer. After continuous casting, the mold will deform due to thermal expansion. This deformation may cause gaps at the mold closing position, resulting in leakage of the molten metal liquid during casting and negative impacts such as cold shuts, inclusions, and pores in the casting. Summary of the Invention

[0004] The purpose of the present invention is to provide a casting device for a light alloy motor housing to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A casting device for a light alloy motor housing includes a base, the base includes two support seats, a tabletop is fixedly installed on the tops of the two support seats, two movable components are fixedly installed on the top of the tabletop, and further includes a linkage casting mechanism, which includes two cleaning components, the two cleaning components are fixedly installed on the tops of the two movable components, a mold forming component is fixedly installed at the middle positions of the two cleaning components, a blanking component is fixedly installed on the top of the mold forming component, a feeding component is fixedly installed on the right side of the blanking component, and a casting component is fixedly installed at the middle position of the mold forming component.

[0006] Locking assembly, the locking assembly includes two connecting blocks, a fixing ring is fixedly installed on the front side of the left connecting block, a circular shell is fixedly installed on the front side of the right connecting block, a ventilation pipe is fixedly connected to the front side of the circular shell, the tail end of the ventilation pipe is fixedly connected to a heat absorption block, a push rod is movably installed inside the circular shell, a spring is sleeved on the outer edge of the push rod, the left outer edge of the push rod abuts against a plurality of steel balls, and a plurality of the steel balls are all movably clamped on the left side of the circular shell.

[0007] Preferably, the movable assembly includes a fixing block, the fixing block is fixedly installed on the top of the table, two screw rods are fixedly installed on the left side of the fixing block, and a supporting plate is movably sleeved on the outer edges of the two screw rods.

[0008] Preferably, the cleaning assembly includes two groups of first tracks, both groups of first tracks are fixedly installed on the top of the table, movable blocks are movably clamped on the tops of the two groups of first tracks, return rods are movably hinged on the tops of the two movable blocks, and a cleaning track is movably hinged on the outer edges of the two return rods.

[0009] Preferably, the molding assembly includes two first brackets, two first hydraulic rods are fixedly installed at the bottoms of the two first brackets, the telescopic ends of the four first hydraulic rods are fixedly connected to a mold, and the outer edge of the mold is fixedly connected to the two connecting blocks and the heat absorption block.

[0010] Preferably, the blanking assembly includes two second brackets, second tracks are fixedly connected to the inner sides of the two second brackets, two support rods are fixedly connected to the outer sides of the two second tracks, a movable plate is movably clamped inside the two second tracks, a second hydraulic rod is installed through the middle position of the movable plate, and the telescopic end of the second hydraulic rod is fixedly connected to a clamping hand.

[0011] Preferably, the feeding assembly includes a melting tank, the melting tank is fixedly installed on the right side of the table, a telescopic pipe is fixedly connected to the bottom of the melting tank, a feeding pipe is fixedly connected to the bottom of the telescopic pipe, two inclined rods are fixedly connected to the outer wall of the feeding pipe, and the two inclined rods are movably clamped inside the inner wall of the support seat.

[0012] Preferably, the casting assembly includes a plum blossom pipe, the plum blossom pipe is fixedly connected to the top of the feeding pipe, triangular blocks are fixedly connected to the outer edge of the plum blossom pipe, three third hydraulic rods are fixedly installed on the top of the triangular blocks, a discharge head is fixedly connected to the top of the plum blossom pipe, a plurality of guiding teeth are opened inside the discharge head, a plurality of first round holes are annularly opened in the discharge head, a casting shell is movably sleeved on the outer edge of the discharge head, and a plurality of second round holes are annularly opened in the casting shell.

[0013] Preferably, the telescopic ends of the three third hydraulic rods are all fixedly connected to the bottom of the table top, and the plum blossom tube is installed through the middle position of the table top.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention installs a pneumatic locking assembly. When the heat absorbing block is heated, the air in the ventilation pipe is pressurized. The pressurized air enters the round shell and pushes the push rod to the left. The push rod with a conical head compresses the stroke of the spring and squeezes out a plurality of steel balls, which are annularly clamped in the fixed ring to form a self-locking structure, further increasing the tightness of the two molds. When the metal liquid in the cavity is slightly cooled and the temperature drops, when the thrust of the hot air in the round shell is less than the elastic force of the spring, the push rod moves to the right, and the plurality of steel balls are released from the fixed ring, thereby solving the problem that the mold may be deformed due to thermal expansion, and this deformation may cause a gap in the mold clamping position.

[0016] 2. The present invention is equipped with a newly designed casting assembly. The molten metal liquid enters the plum blossom tube through the telescopic tube and the feed tube. At this time, the metal liquid will fill the discharge head on the top. After the metal liquid is guided by multiple guide teeth in the discharge head, it will be discharged through the overlapping first circular hole and the second circular hole. After the lower half of the cavity is filled with the metal liquid, the stroke of the three third hydraulic rods is shortened to push the third hydraulic rods to move upward in the casting shell. When the first circular hole overlaps with the second circular hole again, the metal liquid is discharged to fill the upper half of the cavity. The upper and lower filling and casting can be carried out in layers, thereby improving the casting quality.

[0017] 3. The present invention is equipped with movable components and cleaning components. The two supporting plates move along the screw to the position of the fixed block. At this time, the motor housing fixed by the clamp can complete the demoulding of the bottom surface. The two movable blocks move outward in the first track, and the cleaning track will be pulled through two return rods to reduce its longitudinal height, so that the cleaning track can be operated to clean the supporting plates, thereby realizing portable demoulding and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a bottom view of the overall structure of the present invention;

[0020] Figure 3 It is a top view of the overall structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the cleaning component structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the molding component of the present invention;

[0023] Figure 6 This is a schematic structural diagram of the locking component of the present invention;

[0024] Figure 7 This is a schematic structural diagram of the blanking component of the present invention;

[0025] Figure 8 This is a sectional view of the casting component of the present invention;

[0026] Figure 9 This is a bottom view of the casting component of the present invention;

[0027] Figure 10 This is a schematic structural diagram of the guiding teeth of the present invention.

[0028] In the figure: 1, base; 2, movable component; 3, cleaning component; 4, molding component; 5, locking component; 6, blanking component; 7, feeding component; 8, casting component; 11, support seat; 12, tabletop; 21, fixing block; 22, screw rod; 23, supporting plate; 31, first track; 32, movable block; 33, return-shaped rod; 34, cleaning track; 41, first bracket; 42, first hydraulic rod; 43, mold; 51, connecting block; 52, fixing ring; 53, round shell; 54, ventilation pipe; 55, heat absorption block; 56, push rod; 57, spring; 58, steel ball; 61, second bracket; 62, second track; 63, movable plate; 64, support rod; 65, second hydraulic rod; 66, clamping hand; 71, melting tank; 72, telescopic pipe; 73, feeding pipe; 74, inclined rod; 81, plum blossom pipe; 82, triangular block; 83, third hydraulic rod; 84, discharge head; 85, guiding teeth; 86, first round hole; 87, casting shell; 88, second round hole. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] Such as Figures 1 to 10As shown in the figure, an embodiment of the present invention provides a casting device for a light alloy motor housing, including a base 1. The base 1 includes two support seats 11. The top of the two support seats 11 is fixedly installed with a tabletop 12. The top of the tabletop 12 is fixedly installed with two movable components 2. It further includes a linkage casting mechanism, which includes two cleaning components 3. The two cleaning components 3 are fixedly installed on the top of the two movable components 2. A mold forming component 4 is fixedly installed at the middle position of the two cleaning components 3. A blanking component 6 is fixedly installed on the top of the mold forming component 4. A feeding component 7 is fixedly installed on the right side of the blanking component 6. A casting component 8 is fixedly installed at the middle position of the mold forming component 4;

[0031] A locking component 5. The locking component 5 includes two connecting blocks 51. A fixed ring 52 is fixedly installed on the front side of the left connecting block 51. A circular shell 53 is fixedly installed on the front side of the right connecting block 51. A ventilation pipe 54 is fixedly connected to the front side of the circular shell 53. The tail end of the ventilation pipe 54 is fixedly connected to a heat absorption block 55. A push rod 56 is movably installed inside the circular shell 53. A spring 57 is sleeved on the outer edge of the push rod 56. The left outer edge of the push rod 56 abuts against a plurality of steel balls 58. The plurality of steel balls 58 are all movably clamped on the left side of the circular shell 53;

[0032] When the heat absorption block 55 is heated, it will pressurize the air in the ventilation pipe 54. The pressurized air enters the circular shell 53, which will push the push rod 56 to the left. The conical push rod 56 will compress the stroke of the spring 57 and squeeze out the plurality of steel balls 58, which are annularly clamped in the fixed ring 52 to form a self-locking structure, further increasing the merging tightness between the two molds 43. When the molten metal in the cavity cools slightly and the temperature drops, when the thrust of the hot air in the circular shell 53 is less than the elastic force of the spring 57, the push rod 56 moves to the right, and the plurality of steel balls 58 are disengaged from the connection with the fixed ring 52, solving the problem that the mold may deform due to thermal expansion, and this deformation may cause gaps at the mold clamping position;

[0033] Among them, the movable component 2 includes a fixed block 21. The fixed block 21 is fixedly installed on the top of the tabletop 12. Two lead screws 22 are fixedly installed on the left side of the fixed block 21. A support plate 23 is movably sleeved on the outer edge of the two lead screws 22;

[0034] The two symmetrically installed support plates 23 move towards the middle along the lead screws 22 and merge, and can form a cavity with the two molds 43 and the casting shell 87. After casting, the two support plates 23 move along the lead screws 22 towards the position of the fixed block 21. At this time, the motor housing fixed by the clamping hand 66 can complete the demoulding of the bottom surface;

[0035] Among them, the cleaning component 3 includes two groups of first tracks 31, both of the two groups of first tracks 31 are fixedly installed on the top of the tabletop 12, movable blocks 32 are movably clamped on the tops of the two groups of first tracks 31, return-shaped rods 33 are movably hinged to the tops of the two movable blocks 32, and a cleaning track 34 is movably hinged to the outer edges of the two return-shaped rods 33;

[0036] When the two movable blocks 32 move outward in the first track 31, they will pull the cleaning track 34 through the two return-shaped rods 33, reduce its longitudinal height, and make the cleaning track 34 operate, so as to clean the supporting plate 23. After the cleaning is completed, the two movable blocks 32 move inward along the first track 31, and the cleaning track 34 is lifted again through the return-shaped rods 33, so that the cleaned supporting plate 23 can move again;

[0037] Among them, the molding component 4 includes two first brackets 41, two first hydraulic rods 42 are fixedly installed at the bottoms of the two first brackets 41, a mold 43 is fixedly connected to the telescopic ends of the four first hydraulic rods 42, and the outer edge of the mold 43 is fixedly connected to the two connecting blocks 51 and the heat absorption block 55;

[0038] By increasing the stroke of the four first hydraulic rods 42, the two molds 43 can be pushed and combined, and the two symmetrically installed supporting plates 23 move towards the middle along the lead screw 22 and are combined, so as to form a cavity with the two molds 43 and the casting shell 87;

[0039] Among them, the blanking component 6 includes two second brackets 61, second tracks 62 are fixedly connected to the inner sides of the two second brackets 61, two support rods 64 are fixedly connected to the outer sides of the two second tracks 62, a movable plate 63 is movably clamped inside the two second tracks 62, a second hydraulic rod 65 is installed through the middle position of the movable plate 63, and a clamp 66 is fixedly connected to the telescopic end of the second hydraulic rod 65;

[0040] By moving the movable plate 63 to the top of the motor housing and increasing the stroke of the second hydraulic rod 65, the clamp 66 can clamp the outside of the motor housing. After the clamp 66 clamps, the two supporting plates 23 are moved along the lead screw 22 towards the position of the fixed block 21. At this time, the motor housing fixed by the clamp 66 can complete the demoulding of the bottom surface;

[0041] Among them, the bottom of the melting tank 71 is fixedly connected with a telescopic pipe 72, the bottom of the telescopic pipe 72 is fixedly connected with a feed pipe 73, and two inclined rods 74 are fixedly connected to the outer wall of the feed pipe 73. Both of the two inclined rods 74 are movably clamped inside the inner wall of the support base 11;

[0042] The alloy raw materials are heated and melted by the melting tank 71, and the molten metal liquid enters the plum blossom pipe 81 after passing through the telescopic pipe 72 and the feeding pipe 73. When the discharging head 84 moves, the plum blossom pipe 81, the feeding pipe 73, and the telescopic pipe 72 will all move upward by a certain distance under the drive of the third hydraulic rod 83. The two feeding pipes 73 will move within the support seat 11 to play a role in support and limit;

[0043] Among them, the casting assembly 8 includes a plum blossom pipe 81. The plum blossom pipe 81 is fixedly connected to the top of the feeding pipe 73. A triangular block 82 is fixedly connected to the outer edge of the plum blossom pipe 81. Three third hydraulic rods 83 are fixedly installed on the top of the triangular block 82. The top of the plum blossom pipe 81 is fixedly connected to a discharging head 84. A plurality of guiding teeth 85 are provided inside the discharging head 84. A plurality of first round holes 86 are annularly provided in the discharging head 84. The outer edge of the discharging head 84 is movably sleeved with a casting shell 87. A plurality of second round holes 88 are annularly provided in the casting shell 87; The telescopic ends of the three third hydraulic rods 83 are all fixedly connected to the bottom of the table 12. The plum blossom pipe 81 is installed through the middle position of the table 12;

[0044] The molten metal liquid enters the plum blossom pipe 81 after passing through the telescopic pipe 72 and the feeding pipe 73. At this time, the metal liquid will fill the top discharging head 84. After the metal liquid is guided by a plurality of guiding teeth 85 in the discharging head 84, it then exits the liquid after passing through the overlapping first round holes 86 and second round holes 88. After the lower half of the cavity is filled with the metal liquid, the stroke of the three third hydraulic rods 83 is shortened, and the third hydraulic rods 83 are pushed to move upward in the casting shell 87. When the first round holes 86 and the second round holes 88 overlap again, the metal liquid discharges to fill the upper half of the cavity.

[0045] Working principle:

[0046] When using the present invention for casting the motor housing, first increase the stroke of the four first hydraulic rods 42, push the two molds 43 to merge and then stop. During the merging process, the round shell 53 will be pushed and inserted into the fixed ring 52, and the two symmetrically installed supporting plates 23 will move along the lead screw 22 towards the middle and merge to form a cavity with the two molds 43 and the casting shell 87;

[0047] Then, prepare the raw materials. The alloy raw materials are heated and melted by the melting tank 71. The molten metal liquid enters the plum blossom pipe 81 after passing through the telescopic pipe 72 and the feeding pipe 73. At this time, the metal liquid will fill the top discharging head 84.

[0048] After the molten metal is guided by multiple guiding teeth 85 in the discharge head 84, it then exits through the overlapping first round hole 86 and second round hole 88. After the lower half of the cavity is filled with the molten metal, the stroke of the three third hydraulic rods 83 is shortened, pushing the third hydraulic rods 83 to move upward in the casting shell 87. When the first round hole 86 and the second round hole 88 overlap again, the molten metal discharges to fill the upper half of the cavity;

[0049] When the discharge head 84 moves, the plum blossom tube 81, the feed pipe 73, and the telescopic pipe 72 will all move upward a certain distance under the drive of the third hydraulic rod 83. The two feed pipes 73 will move within the support seat 11, playing a role in support and limit;

[0050] When the molten metal in the cavity is filled, it will transfer heat to the outer edge of the mold 43. When the heat absorption block 55 is heated, it will pressurize the air in the ventilation pipe 54. The pressurized air enters the round shell 53, pushing the push rod 56 to the left. The push rod 56 with a conical head will compress the stroke of the spring 57 and squeeze out multiple steel balls 58, which are annularly clamped within the fixed ring 52 to form a self-locking structure, further increasing the merging tightness between the two molds 43. When the temperature of the molten metal in the cavity drops slightly after cooling, when the thrust of the hot air in the round shell 53 is less than the elastic force of the spring 57, the push rod 56 moves to the right, and the multiple steel balls 58 are disengaged from the connection with the fixed ring 52;

[0051] At this time, the stroke of the four first hydraulic rods 42 is shortened to expose the internally cast motor housing. Then, the movable plate 63 is moved to the top of the motor housing, and the stroke of the second hydraulic rod 65 is increased so that the clamp 66 can hold the outside of the motor housing. After the clamp 66 holds, the two support plates 23 are moved along the lead screw 22 towards the position of the fixed block 21. At this time, the motor housing fixed by the clamp 66 will complete the demoulding of the bottom surface, and then the motor housing can be moved away through the movable plate 63 to complete the blanking;

[0052] The two support plates 23 stop when they move to the position of the cleaning assembly 3. The movable blocks 32 are started. The two movable blocks 32 move outward in the first track 31, pulling the cleaning track 34 through the two return-shaped rods 33 to lower its longitudinal height, making the cleaning track 34 operate to clean the support plates 23. After cleaning, the two movable blocks 32 move inward along the first track 31, lifting the cleaning track 34 again through the return-shaped rods 33 so that the cleaned support plates 23 can move again. Thus, the working process ends.

[0053] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light alloy motor housing casting device, comprising a base (1), characterized in that: The base (1) comprises two support seats (11), a table top (12) is fixedly mounted on the top of the two support seats (11), two movable components (2) are fixedly mounted on the top of the table top (12), and further comprises: A linkage casting mechanism, comprising two cleaning assemblies (3), the two cleaning assemblies (3) being fixedly mounted on the tops of the two movable assemblies (2), a molding assembly (4) being fixedly mounted in the middle of the two cleaning assemblies (3), a material discharge assembly (6) being fixedly mounted on the top of the molding assembly (4), a material feed assembly (7) being fixedly mounted on the right side of the material discharge assembly (6), and a casting assembly (8) being fixedly mounted in the middle of the molding assembly (4); A locking assembly (5), the locking assembly (5) comprising two connecting blocks (51), a fixing ring (52) being fixedly mounted on the front side of the left connecting block (51), a round shell (53) being fixedly mounted on the front side of the right connecting block (51), a vent pipe (54) being fixedly connected to the front side of the round shell (53), a heat absorbing block (55) being fixedly connected to the rear end of the vent pipe (54), a push rod (56) being movably mounted inside the round shell (53), a spring (57) being sleeved on the outer edge of the push rod (56), a plurality of steel balls (58) being abutted against the left outer edge of the push rod (56), and the plurality of steel balls (58) being movably clamped on the left side of the round shell (53); The casting assembly (8) comprises a plum blossom tube (81), the plum blossom tube (81) is fixedly connected to the top of the feed pipe (73), the outer edge of the plum blossom tube (81) is fixedly connected to a triangular block (82), the top of the triangular block (82) is fixedly mounted with three third hydraulic rods (83), the top of the plum blossom tube (81) is fixedly connected to a discharge head (84), the inside of the discharge head (84) is provided with a plurality of guide teeth (85), the discharge head (84) is annularly provided with a plurality of first circular holes (86), the outer edge of the discharge head (84) is movably sleeved with a casting shell (87), the casting shell (87) is annularly provided with a plurality of second circular holes (88); The telescopic ends of the three third hydraulic rods (83) are all fixedly connected to the bottom of the table top (12), and the plum blossom tube (81) is installed through the middle of the table top (12).

2. A light alloy motor housing casting equipment according to claim 1, characterized in that: The movable assembly (2) comprises a fixed block (21), the fixed block (21) being fixedly mounted on the top of the tabletop (12), two screw rods (22) being fixedly mounted on the left side of the fixed block (21), and a supporting plate (23) being movably sleeved on the outer edges of the two screw rods (22).

3. A light alloy motor housing casting equipment according to claim 2, characterized in that: The cleaning assembly (3) comprises two groups of first rails (31), the two groups of first rails (31) are fixedly mounted on the top of the table (12), the tops of the two groups of first rails (31) are movably connected to movable blocks (32), the tops of the two movable blocks (32) are movably hinged to return rods (33), and the outer edges of the two return rods (33) are movably hinged to cleaning tracks (34).

4. The light alloy motor housing casting equipment according to claim 3 is characterized in that: The mold assembly (4) comprises two first brackets (41), two first hydraulic rods (42) are fixedly mounted at the bottom of each of the two first brackets (41), the telescopic ends of the four first hydraulic rods (42) are fixedly connected to a mold (43), and the outer edge of the mold (43) is fixedly connected to two connecting blocks (51) and a heat absorbing block (55).

5. The light alloy motor housing casting equipment according to claim 4 is characterized in that: The material removal assembly (6) comprises two second brackets (61), the inner sides of the two second brackets (61) are fixedly connected to second rails (62), the outer sides of the two second rails (62) are fixedly connected to two support rods (64), the inner sides of the two second rails (62) are movably connected to movable plates (63), a second hydraulic rod (65) is installed through the middle of the movable plate (63), and a gripper (66) is fixedly connected to the telescopic end of the second hydraulic rod (65).

6. The light alloy motor housing casting equipment according to claim 5, characterized in that: The feed assembly (7) comprises a melting box (71), the melting box (71) being fixedly mounted on the right side of the table top (12), the bottom of the melting box (71) being fixedly connected to a telescopic tube (72), the bottom of the telescopic tube (72) being fixedly connected to a feed pipe (73), the outer wall of the feed pipe (73) being fixedly connected to two inclined rods (74), the two inclined rods (74) being movably clamped to the inner wall of the support seat (11).

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