Sand mold of burner fire plate

Abstract

The utility model relates to a sand mold of a burner fire plate, which is characterized by comprising an upper sand mold and a lower sand mold, the lower sand mold is provided with a lower liquid inlet groove, a first lower separation protrusion, a first lower rear liquid inlet groove, a first lower front liquid inlet groove, a first lower fire plate groove, a second lower fire plate groove, a second lower rear liquid inlet groove, a second lower front liquid inlet groove, a lower liquid guide groove, a third lower rear liquid inlet groove, a third lower front liquid inlet groove, a second lower separation protrusion, a third lower fire plate groove and a fourth lower fire plate groove. An upper liquid inlet groove, a first upper separation bulge, a first upper rear liquid inlet groove, a first upper front liquid inlet groove, a first upper fire plate groove, a second upper fire plate groove, a second upper rear liquid inlet groove, a second upper front liquid inlet groove, an upper liquid guide groove, a third upper rear liquid inlet groove, a third upper front liquid inlet groove, a second upper separation bulge, a third upper fire plate groove and a fourth upper fire plate groove are respectively formed in the upper sand mold; the sand mold has the advantages of reducing the pressure in the sand mold, being not easy to damage, reducing the production cost and accelerating the production efficiency.

Description

Technical Field

[0001] The utility model relates to a sand mold of a burner fire plate. Background Art

[0002] The existing sand mold for producing the burner fire disk can only cast two sets of fire disk molds at one time. The existing sand mold includes a liquid inlet pipe, a first fire disk groove and a second fire disk groove. The liquid inlet pipe is connected to the first fire disk groove and the second fire disk groove respectively. During casting, the liquid flows from top to bottom to the first fire disk groove and the second fire disk groove respectively, causing the pressure in the first fire disk groove and the second fire disk groove to suddenly increase, which makes the sand mold easily damaged. Summary of the invention

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a sand mold for a burner fire disk, wherein the pressure inside the sand mold is reduced, the sand mold is not easily damaged, the production cost is reduced and the production efficiency is accelerated.

[0004] In order to achieve the above object, the utility model is implemented as follows: it is a sand mold of a burner fire plate, including an upper sand mold and a lower sand mold, characterized in that

[0005] The lower sand mold is respectively provided with a lower liquid inlet trough, a first lower dividing protrusion, a first lower rear liquid inlet trough, a first lower front liquid trough, a first lower fire tray trough, a second lower fire tray trough, a second lower rear liquid inlet trough, a second lower front liquid trough, a lower liquid guide trough, a third lower rear liquid inlet trough, a third lower front liquid trough, a second lower dividing protrusion, a third lower fire tray trough and a fourth lower fire tray trough; the lower liquid inlet trough is respectively connected with the first lower rear liquid inlet trough and the first lower front liquid trough, and the first lower dividing protrusion is located between the first lower rear liquid inlet trough and the first lower front liquid trough to divide the first lower rear liquid inlet trough and the first lower front liquid trough. The first lower rear inlet liquid groove is connected with the first lower fire tray groove and the second lower rear inlet liquid groove respectively, the first lower front liquid groove is connected with the second lower fire tray groove and the second lower front liquid groove respectively, the second lower front liquid groove and the second lower rear inlet liquid groove are connected with the lower liquid guide groove respectively, the lower liquid guide groove is connected with the third lower rear inlet liquid groove and the third lower front liquid groove respectively, the second lower dividing protrusion separates and guides the third lower rear inlet liquid groove and the third lower front liquid groove, the third lower rear inlet liquid groove is connected with the third lower fire tray groove, and the third lower front liquid groove is connected with the fourth lower fire tray groove;

[0006] The upper sand mold is respectively provided with an upper liquid inlet trough, a first upper dividing protrusion, a first upper rear liquid inlet trough, a first upper front liquid trough, a first upper heating plate trough, a second upper heating plate trough, a second upper rear liquid inlet trough, a second upper front liquid trough, an upper liquid guide trough, a third upper rear liquid inlet trough, a third upper front liquid trough, a second upper dividing protrusion, a third upper heating plate trough and a fourth upper heating plate trough; the upper liquid inlet trough is respectively connected with the first upper rear liquid inlet trough and the first upper front liquid trough, and the first upper dividing protrusion is located between the first upper rear liquid inlet trough and the first upper front liquid trough to separate the first upper rear liquid inlet trough and the first upper front liquid trough. The first upper rear inlet liquid tank is connected to the first upper heating tray tank and the second upper rear inlet liquid tank respectively, the first upper front liquid tank is connected to the second upper heating tray tank and the second upper front liquid tank respectively, the second upper front liquid tank and the second upper rear inlet liquid tank are connected to the upper liquid guide tank respectively, the upper liquid guide tank is connected to the third upper rear inlet liquid tank and the third upper front liquid tank respectively, the second upper partition protrusion separates and guides the third upper rear inlet liquid tank and the third upper front liquid tank, the third upper rear inlet liquid tank is connected to the third upper heating tray tank, and the third upper front liquid tank is connected to the fourth upper heating tray tank;

[0007] The upper sand mold is covered on the lower sand mold, the upper liquid inlet tank cover forms a liquid inlet pipeline on the lower liquid inlet tank, the first upper dividing protrusion cover forms a guide surface on the first lower dividing protrusion, the first lower front liquid tank cover forms a first front liquid pipeline on the first upper front liquid tank, the first lower rear liquid inlet tank cover forms a first rear liquid inlet pipeline on the first upper rear liquid inlet tank, the first upper fire tray tank cover forms a first fire tray tank on the first lower fire tray tank, the second upper fire tray tank cover forms a second fire tray tank on the second lower fire tray tank, and the second upper rear liquid inlet tank cover forms a second The rear liquid inlet pipeline, the second upper front liquid tank cover forms a second front liquid tank on the second lower front liquid tank, the upper liquid guide tank cover forms a liquid guide tank on the lower liquid guide tank, the third upper rear liquid inlet pipeline is formed on the third lower rear liquid inlet pipeline, the third upper front liquid tank cover forms a third front liquid tank on the third lower front liquid tank, the second upper dividing protrusion cover forms a second guide surface on the second lower dividing protrusion, the third upper fire tray slot cover forms a third fire tray slot on the third lower fire tray slot, and the fourth upper fire tray slot cover forms a fourth fire tray slot on the fourth lower fire tray slot.

[0008] In the present technical solution, a first lower rear liquid inlet and a first lower front liquid inlet are further provided on the lower sand mold, and a first upper rear liquid inlet and a first upper front liquid inlet are further provided on the upper sand mold; the first lower rear liquid inlet cover forms a first rear liquid inlet on the first upper rear liquid inlet, and the first rear liquid inlet pipeline is connected to the first fire tray groove through the first rear liquid inlet; the first upper front liquid inlet cover forms a first front liquid inlet on the first lower front liquid inlet, and the first front liquid pipeline is connected to the second fire tray groove through the first front liquid inlet.

[0009] In the present technical solution, a second lower rear liquid inlet and a second lower front liquid inlet are further provided on the lower sand mold, and a second upper rear liquid inlet and a second upper front liquid inlet are further provided on the upper sand mold; the second lower rear liquid inlet cover forms a second rear liquid inlet on the second upper rear liquid inlet, and the third rear liquid inlet pipeline is connected to the third fire disk groove through the second rear liquid inlet; the second upper front liquid inlet cover forms a second front liquid inlet on the second lower front liquid inlet, and the third front liquid pipeline is connected to the fourth fire disk groove through the second front liquid inlet.

[0010] In the present technical solution, the arc angle of the first lower dividing protrusion is a, and the range of a is 45°-120°; the arc angle of the second lower dividing protrusion is b, and the range of b is 20°-60°; the first lower dividing protrusion corresponds to the first upper dividing protrusion, and the second lower dividing protrusion corresponds to the second upper dividing protrusion.

[0011] In the technical solution, a plurality of positioning columns extending downward are provided on the upper sand mold, and a plurality of positioning holes are provided on the lower sand mold, and the positioning columns are inserted into the positioning holes for positioning.

[0012] Compared with the prior art, the utility model has the following advantages: the pressure inside the sand mold is reduced, the sand mold is not easily damaged, the production cost is reduced and the production efficiency is accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Figure 2 It is a three-dimensional diagram of the lower sand mold of the utility model;

[0015] Figure 3 yes Figure 2 A top view of

[0016] Figure 4 It is a three-dimensional diagram of the upper sand mold of the utility model. DETAILED DESCRIPTION

[0017] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] In the description of the present invention, the terms "upper", "lower", "front" and "back" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0019] In the present utility model, unless otherwise clearly stipulated and limited, the term "set" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a detachable arrangement or integration; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, which can enable the internal connection of two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0020] like Figures 1 to 4 As shown, it is a sand mold of a burner fire plate, characterized in that it includes

[0021] It comprises an upper sand mold 1 and a lower sand mold 3, characterized in that

[0022] The lower sand mold 3 is respectively provided with a lower liquid inlet trough 31, a first lower dividing protrusion 32, a first lower rear liquid inlet trough 33, a first lower forward liquid trough 34, a first lower fire tray trough 37, a second lower fire tray trough 40, a second lower rear liquid inlet trough 39, a second lower forward liquid trough 36, a lower liquid guide trough 41, a third lower rear liquid inlet trough 42, a third lower forward liquid trough 43, a second lower dividing protrusion 44, a third lower fire tray trough 47 and a fourth lower fire tray trough 48; the lower liquid inlet trough 31 is respectively connected with the first lower rear liquid inlet trough 33 and the first lower forward liquid trough 34, the first lower dividing protrusion 32 is located between the first lower rear liquid inlet trough 33 and the first lower forward liquid trough 34 to connect the first lower rear liquid inlet trough 33 and the first lower forward liquid The groove 34 separates and guides the flow, the first lower rear liquid inlet groove 33 is respectively connected with the first lower fire tray groove 37 and the second lower rear liquid inlet groove 39, the first lower forward liquid groove 34 is respectively connected with the second lower fire tray groove 40 and the second lower forward liquid groove 36, the second lower forward liquid groove 36 and the second lower rear liquid inlet groove 39 are respectively connected with the lower liquid guiding groove 41, the lower liquid guiding groove 41 is respectively connected with the third lower rear liquid inlet groove 42 and the third lower forward liquid groove 43, the second lower separation protrusion 44 separates and guides the third lower rear liquid inlet groove 42 and the third lower forward liquid groove 43, the third lower rear liquid inlet groove 42 is connected with the third lower fire tray groove 47, and the third lower forward liquid groove 43 is connected with the fourth lower fire tray groove 48;

[0023] The upper sand mold 1 is respectively provided with an upper liquid inlet trough 11, a first upper dividing protrusion 12, a first upper rear liquid inlet trough 13, a first upper front liquid trough 14, a first upper heating plate trough 17, a second upper heating plate trough 20, a second upper rear liquid inlet trough 19, a second upper front liquid trough 16, an upper liquid guide trough 21, a third upper rear liquid inlet trough 22, a third upper front liquid trough 23, a second upper dividing protrusion 24, a third upper heating plate trough 27 and a fourth upper heating plate trough 28; the upper liquid inlet trough 11 is respectively connected with the first upper rear liquid inlet trough 13 and the first upper front liquid trough 14, the first upper dividing protrusion 12 is located between the first upper rear liquid inlet trough 13 and the first upper front liquid trough 14 to connect the first upper rear liquid inlet trough 13 and the first upper front liquid The groove 14 separates and guides the flow, the first upper rear liquid inlet groove 13 is respectively connected to the first heating tray groove 17 and the second upper rear liquid inlet groove 19, the first upper front liquid groove 14 is respectively connected to the second heating tray groove 20 and the second upper front liquid groove 16, the second upper front liquid groove 16 and the second upper rear liquid inlet groove 19 are respectively connected to the upper liquid guiding groove 21, the upper liquid guiding groove 21 is respectively connected to the third upper rear liquid inlet groove 22 and the third upper front liquid groove 23, the second upper separation protrusion 24 separates and guides the third upper rear liquid inlet groove 22 and the third upper front liquid groove 23, the third upper rear liquid inlet groove 22 is connected to the third heating tray groove 27, and the third upper front liquid groove 23 is connected to the fourth heating tray groove 28;

[0024] The upper sand mold 1 is covered on the lower sand mold 3, the upper liquid inlet groove 11 is covered on the lower liquid inlet groove 31 to form a liquid inlet pipeline, the first upper dividing protrusion 12 is covered on the first lower dividing protrusion 32 to form a guide surface, the first lower front liquid groove 34 is covered on the first upper front liquid groove 14 to form a first front liquid pipeline, the first lower rear liquid inlet groove 33 is covered on the first upper rear liquid inlet groove 13 to form a first rear liquid inlet pipeline, the first upper fire tray groove 17 is covered on the first lower fire tray groove 37 to form a first fire tray groove, the second upper fire tray groove 20 is covered on the second lower fire tray groove 40 to form a second fire tray groove, and the second upper rear liquid inlet groove 19 is covered on the second lower rear liquid inlet groove 39 to form a first The second rear liquid inlet pipeline, the second upper front liquid groove 16 covers the second lower front liquid groove 36 to form a second front liquid pipeline, the upper liquid guiding groove 21 covers the lower liquid guiding groove 41 to form a liquid guiding pipeline, the third upper rear liquid inlet groove 22 covers the third lower rear liquid inlet groove 42 to form a third rear liquid inlet pipeline, the third upper front liquid groove 23 covers the third lower front liquid groove 43 to form a third front liquid pipeline, the second upper dividing protrusion 24 covers the second lower dividing protrusion 44 to form a second guide surface, the third upper fire tray groove 27 covers the third lower fire tray groove 47 to form a third fire tray groove, and the fourth upper fire tray groove 28 covers the fourth lower fire tray groove 48 to form a fourth fire tray groove.

[0025] The liquid enters from the liquid inlet pipe from top to bottom through the first rear liquid inlet pipe and the first front liquid inlet pipe, and is diverted by the guide surface, so that the downward flow rate of the liquid is slowed down, the pressure of the liquid on the sand mold is reduced, and the liquid can enter the first fire tray groove and the second fire tray groove through the first rear liquid inlet pipe and the first front liquid pipe; then enter the liquid guide pipe through the second front liquid pipe and the second front liquid pipe, the liquid guide pipe enters the third front liquid pipe and the third rear liquid inlet pipe and is diverted and decompressed again through the second guide surface, and the liquid after diversion and decompression enters the third fire tray groove and the fourth fire tray groove; the pressure in the sand mold is reduced, the sand mold is not easily damaged, the production cost is reduced and the production efficiency is accelerated.

[0026] In this embodiment, a first lower rear liquid inlet 35 and a first lower front liquid inlet 38 are further provided on the lower sand mold 3, and a first upper rear liquid inlet 15 and a first upper front liquid inlet 18 are also provided on the upper sand mold 1; the first lower rear liquid inlet 35 covers the first upper rear liquid inlet 15 to form a first rear liquid inlet, and the first rear liquid inlet pipeline is connected to the first fire disk groove through the first rear liquid inlet; the first upper front liquid inlet 18 covers the first lower front liquid inlet 38 to form a first front liquid inlet, and the first front liquid pipeline is connected to the second fire disk groove through the first front liquid inlet.

[0027] In this embodiment, a second lower rear liquid inlet 45 and a second lower front liquid inlet 46 are further provided on the lower sand mold 3, and a second upper rear liquid inlet 25 and a second upper front liquid inlet 26 are also provided on the upper sand mold 1; the second lower rear liquid inlet 45 covers the second upper rear liquid inlet 25 to form a second rear liquid inlet, and the third rear liquid inlet pipeline is connected to the third fire disk groove through the second rear liquid inlet; the second upper front liquid inlet 26 covers the second lower front liquid inlet 46 to form a second front liquid inlet, and the third front liquid pipeline is connected to the fourth fire disk groove through the second front liquid inlet.

[0028] In this embodiment, the arc angle of the first lower dividing protrusion 32 is a, and the range of a is 45°-120°, and the arc angle of the second lower dividing protrusion 44 is b, and the range of b is 20°-60°. The a can be 45°, 55°, 65°, 75°, 85°, 95°, 105° and 120°, and the b can be 20°, 30°, 40°, 50° and 60°; the first lower dividing protrusion 32 corresponds to the first upper dividing protrusion 12, and the second lower dividing protrusion 44 corresponds to the second upper dividing protrusion 24.

[0029] In this embodiment, a plurality of positioning columns 49 extending downward are further provided on the upper sand mold 1 , and a plurality of positioning holes 29 are further provided on the lower sand mold 3 . The positioning columns 49 are inserted into the positioning holes 29 for positioning.

[0030] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For ordinary technicians in this field, various changes, modifications, substitutions and deformations of these embodiments without departing from the principle and purpose of the present invention still fall within the scope of protection of the present invention.

Claims

1. A sand mold for a burner fire plate, comprising an upper sand mold (1) and a lower sand mold (3), characterized in that The lower sand mold (3) is provided with a lower liquid inlet groove (31), a first lower dividing protrusion (32), a first lower rear liquid inlet groove (33), a first lower forward liquid groove (34), a first lower fire tray groove (37), a second lower fire tray groove (40), a second lower rear liquid inlet groove (39), a second lower forward liquid groove (36), a lower liquid guide groove (41), a third lower rear liquid inlet groove (42), a third lower forward liquid groove (43), a second lower dividing protrusion (44), a third lower fire tray groove (47) and a fourth lower fire tray groove (48). The lower liquid inlet groove (31) is respectively connected to the first lower rear liquid inlet groove (33) and the first lower forward liquid groove (34). The first lower dividing protrusion (32) is located between the first lower rear liquid inlet groove (33) and the first lower forward liquid groove (34) to connect the first lower rear liquid inlet groove (33) and the first lower forward liquid groove (34). The liquid inlet groove (34) is separated and diverted, the first lower rear liquid inlet groove (33) is respectively connected to the first lower fire tray groove (37) and the second lower rear liquid inlet groove (39), the first lower forward liquid groove (34) is respectively connected to the second lower fire tray groove (40) and the second lower forward liquid groove (36), the second lower forward liquid groove (36) and the second lower rear liquid inlet groove (39) are respectively connected to the lower liquid guide groove (41), the lower liquid guide groove (41) is respectively connected to the third lower rear liquid inlet groove (42) and the third lower forward liquid groove (43), the second lower separation protrusion (44) separates and diverts the third lower rear liquid inlet groove (42) and the third lower forward liquid groove (43), the third lower rear liquid inlet groove (42) is connected to the third lower fire tray groove (47), and the third lower forward liquid groove (43) is connected to the fourth lower fire tray groove (48); The upper sand mold (1) is provided with an upper liquid inlet groove (11), a first upper dividing protrusion (12), a first upper rear liquid inlet groove (13), a first upper front liquid inlet groove (14), a first upper heating plate groove (17), a second upper heating plate groove (20), a second upper rear liquid inlet groove (19), a second upper front liquid inlet groove (16), an upper liquid guide groove (21), a third upper rear liquid inlet groove (22), a third upper front liquid inlet groove (23), a second upper dividing protrusion (24), a third upper heating plate groove (27) and a fourth upper heating plate groove (28); the upper liquid inlet groove (11) is connected to the first upper rear liquid inlet groove (13) and the first upper front liquid inlet groove (14) respectively; the first upper dividing protrusion (12) is located between the first upper rear liquid inlet groove (13) and the first upper front liquid inlet groove (14) so ​​as to connect the first upper rear liquid inlet groove (13) and the first upper front liquid inlet groove (14) to each other. The liquid inlet groove (14) is separated and diverted, the first upper rear liquid inlet groove (13) is respectively connected to the first heating tray groove (17) and the second upper rear liquid inlet groove (19), the first upper front liquid groove (14) is respectively connected to the second heating tray groove (20) and the second upper front liquid groove (16), the second upper front liquid groove (16) and the second upper rear liquid inlet groove (19) are respectively connected to the upper liquid guide groove (21), the upper liquid guide groove (21) is respectively connected to the third upper rear liquid inlet groove (22) and the third upper front liquid groove (23), the second upper separation protrusion (24) separates and diverts the third upper rear liquid inlet groove (22) and the third upper front liquid groove (23), the third upper rear liquid inlet groove (22) is connected to the third heating tray groove (27), and the third upper front liquid groove (23) is connected to the fourth heating tray groove (28); The upper sand mold (1) is covered on the lower sand mold (3), the upper liquid inlet groove (11) is covered on the lower liquid inlet groove (31) to form a liquid inlet pipeline, the first upper dividing protrusion (12) is covered on the first lower dividing protrusion (32) to form a guide surface, the first lower forward liquid groove (34) is covered on the first upper forward liquid groove (14) to form a first forward liquid pipeline, the first lower rearward liquid groove (33) is covered on the first upper rearward liquid groove (13) to form a first rearward liquid pipeline, the first upper fire tray groove (17) is covered on the first lower fire tray groove (37) to form a first fire tray groove, the second upper fire tray groove (20) is covered on the second lower fire tray groove (40) to form a second fire tray groove, and the second upper rearward liquid groove (19) is covered on the second lower rearward liquid groove (39) to form a The second upper front liquid groove (16) covers the second lower front liquid groove (36) to form a second front liquid groove, the upper liquid guide groove (21) covers the lower liquid guide groove (41) to form a liquid guide groove, the third upper rear liquid groove (22) covers the third lower rear liquid groove (42) to form a third rear liquid groove, the third upper front liquid groove (23) covers the third lower front liquid groove (43) to form a third front liquid groove, the second upper dividing protrusion (24) covers the second lower dividing protrusion (44) to form a second guide surface, the third upper fire tray groove (27) covers the third lower fire tray groove (47) to form a third fire tray groove, and the fourth upper fire tray groove (28) covers the fourth lower fire tray groove (48) to form a fourth fire tray groove.

2. The sand mold of the burner fire plate according to claim 1, characterized in that The lower sand mold (3) is also provided with a first lower rear liquid inlet (35) and a first lower front liquid inlet (38), and the upper sand mold (1) is also provided with a first upper rear liquid inlet (15) and a first upper front liquid inlet (18); the first lower rear liquid inlet (35) covers the first upper rear liquid inlet (15) to form a first rear liquid inlet, and the first rear liquid inlet pipeline is connected to the first fire tray groove through the first rear liquid inlet; the first upper front liquid inlet (18) covers the first lower front liquid inlet (38) to form a first front liquid inlet, and the first front liquid pipeline is connected to the second fire tray groove through the first front liquid inlet.

3. The sand mold of the burner fire plate according to claim 1, characterized in that The lower sand mold (3) is also provided with a second lower rear liquid inlet (45) and a second lower front liquid inlet (46); the upper sand mold (1) is also provided with a second upper rear liquid inlet (25) and a second upper front liquid inlet (26); the second lower rear liquid inlet (45) covers the second upper rear liquid inlet (25) to form a second rear liquid inlet, and the third rear liquid inlet pipeline is connected to the third fire tray groove through the second rear liquid inlet; the second upper front liquid inlet (26) covers the second lower front liquid inlet (46) to form a second front liquid inlet, and the third front liquid inlet pipeline is connected to the fourth fire tray groove through the second front liquid inlet.

4. The sand mold of the burner fire plate according to claim 1, characterized in that The arc angle of the first lower partition protrusion (32) is a, and the range of a is 45°-120°; the arc angle of the second lower partition protrusion (44) is b, and the range of b is 20°-60°; the first lower partition protrusion (32) corresponds to the first upper partition protrusion (12), and the second lower partition protrusion (44) corresponds to the second upper partition protrusion (24).

5. The sand mold of the burner fire plate according to claim 1, characterized in that The upper sand mould (1) is also provided with a plurality of positioning columns (49) extending downwards, and the lower sand mould (3) is also provided with a plurality of positioning holes (29), wherein the positioning columns (49) are inserted into the positioning holes (29) for positioning.

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