Flange plate machining equipment

Abstract

The flange plate machining equipment comprises a machine box, a workbench is fixedly connected to the top end of the machine box, and a grinding mechanism is arranged under the top end of the workbench; the grinding table is rotationally arranged in the middle of the workbench, and a bidirectional clamping mechanism is arranged on the grinding table; the air pump is fixedly mounted on the inner bottom wall of the case, and a rotary air supply mechanism is arranged between the air pump and the bidirectional clamping mechanism; and the gear ring is fixedly connected to the outer side of the bottom end of the grinding table, and a rotating mechanism matched with the gear ring is arranged below the left side of the workbench. Through cooperative use of the negative pressure pump, the filter box and the airflow circulation system in the case, integrated treatment of metal dust collection and equipment heat dissipation is achieved, and the technical effects of simplifying the equipment structure and improving the heat dissipation efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the field of flange processing, and specifically to a flange processing device. Background Art

[0002] As a key connecting component of pipelines, valves and mechanical equipment, flanges are widely used in industries such as petroleum, chemical engineering, and electric power. Their processing accuracy directly affects the sealing performance and service life. Therefore, higher requirements are imposed on the surface finish and dimensional accuracy of the inner and outer circles and the end faces of flanges. Traditional processing methods usually use lathes or special grinding machines for cutting or grinding. However, due to the special structure of flanges, the clamping method needs to be frequently adjusted during the processing to meet the processing requirements of different parts.

[0003] Currently, some flange processing devices adopt a one-way clamping mechanism, which can only fix the inner or outer circle of the flange. As a result, it is necessary to re-clamp when processing different parts, which not only reduces the processing efficiency but also may affect the processing accuracy due to repeated positioning errors. For example, when grinding the flange end face, if only the inner circle is clamped, the workpiece may vibrate due to insufficient clamping force, affecting the surface quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a flange processing device to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A flange processing device includes

[0007] A chassis, with a workbench fixedly connected to its top, and a grinding mechanism is arranged directly below the top of the workbench;

[0008] A grinding table, which is rotatably arranged in the middle of the workbench, and a two-way clamping mechanism is arranged on the grinding table;

[0009] An air pump, which is fixedly installed on the inner bottom wall of the chassis, and a rotary air supply mechanism is arranged between the air pump and the two-way clamping mechanism;

[0010] A gear ring, which is fixedly connected to the outer bottom of the grinding table, and a rotating mechanism matching the gear ring is arranged below the left side of the workbench;

[0011] A filter box, which is fixedly connected to the middle of the right inner wall of the chassis, and a filtering mechanism is arranged inside the filter box.

[0012] Further, the grinding mechanism includes an electric slide rail 1 horizontally fixed on both sides of the workbench, and an electric slide rail 2 vertically arranged outside the electric slide rail 1. An electric slide rail 3 is arranged between the tops of the two electric slide rails 2. A movable frame is arranged at the bottom end of the electric slide rail 3. A motor 2 is fixedly connected to the top end of the movable frame, and a grinding head is fixedly connected to the output shaft of the motor 2.

[0013] Further, the two-way clamping mechanism includes four movable grooves equiangularly opened on the grinding table, and clamping plates 1 and clamping plates 2 symmetrically arranged at the upper ends of both sides inside the movable grooves. The bottom ends of the clamping plates 1 and clamping plates 2 are fixedly connected with vertical bars, and guide blocks are fixedly connected to both sides of the middle of the vertical bars. Guide grooves slidably matched with the guide blocks are opened on both sides of the inner wall of the movable groove. Rubber dust-proof belts are fixedly connected between the clamping plates 1 and clamping plates 2 and the upper end wall of the movable groove.

[0014] Further, the two-way clamping mechanism further includes an air passage opened inside the middle and outer periphery of the grinding table, and a piston cylinder horizontally fixed outside the top end of the air passage. A piston rod is horizontally fixed outside the bottom end of the vertical bar, and a spring elastically connected to the piston cylinder is sleeved outside the piston rod.

[0015] Further, the rotary air supply mechanism includes a U-shaped conduit arranged at the bottom end of the movable groove, and a reversing valve fixedly connected to the middle of the U-shaped conduit. The two ends of the U-shaped conduit are respectively connected to the air passages inside the middle and outer periphery of the grinding table. A rotary joint is fixedly connected to the top end of the air pump. The movable end of the rotary joint is respectively communicated with four shunt pipes through a five-way valve. The other ends of the four shunt pipes are respectively communicated with four reversing valves. An exhaust pipe 1 is fixedly connected to the bottom end of the air pump, and the bottom end of the exhaust pipe 1 extends to the outside of the chassis and is fixedly connected with a filter.

[0016] Further, the rotating mechanism includes a motor 1 arranged below the left side of the workbench, and a gear rotatably connected to the bottom end of the left side of the workbench through a bearing. The gear meshes with a toothed ring. The housing of the motor 1 is fixedly connected to the lower end surface of the workbench through a hanger. A worm gear is coaxially fixed to the bottom end of the gear, and a worm meshing with the worm gear is fixedly connected to the output shaft of the motor 1.

[0017] Further, the rotating mechanism further includes an annular guide rail embedded and fixed at the inner circle of the workbench, and the outer wall of the grinding table is fixedly connected to the sliding seat of the annular guide rail.

[0018] Further, the filtering mechanism includes a dust suction port arranged above the outside of the right side of the grinding table, and a negative pressure pump fixed to the lower part of the inner wall of the right side of the chassis through an armrest. A negative pressure pipe is fixedly connected to the right side of the dust suction port, and the end of the negative pressure pipe away from the dust suction port is communicated with the upper end of the filter box. A connecting pipe is fixedly connected to the top end of the negative pressure pump, and the top end of the connecting pipe extends to the inner bottom wall of the filter box.

[0019] Further, the bottom end of the negative pressure pump is fixedly connected to a second exhaust pipe, and the pipe orifice of the second exhaust pipe faces the air pump. An exhaust port is fixedly installed in the middle of the left side of the chassis, and a dust-proof net is fixedly installed inside the exhaust port.

[0020] Further, the filtering mechanism further includes a placement groove opened on the right side of the chassis, and a filter box movably installed between the filter box and the placement groove. A filter screen is fixedly installed at the bottom end of the filter box, and a handle is fixedly installed on the outer side of the right side of the filter box. Inside the filter box and symmetrically arranged above the filter box are limiting frames, and the lower end surfaces of the limiting frames are in sliding contact with the upper end surface of the filter box.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. By the combined use of the negative pressure pump, the filter box and the air flow circulation system in the chassis, the present invention realizes the integrated treatment of the collection of metal dust and the heat dissipation of the equipment, achieving the technical effects of simplifying the equipment structure and improving the heat dissipation efficiency.

[0023] 2. By the combined use of the reversing valve and the two-way clamping mechanism, the present invention realizes the flexible switching of three clamping modes of the first clamping plate and the second clamping plate, solves the problem that the single clamping mechanism in the prior art cannot simultaneously meet the processing requirements of the inner circle, outer circle and end face of the flange, and achieves the technical effects of improving the processing accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic front view structure diagram of an overall flange processing device of the present invention;

[0025] Figure 2 It is a schematic internal sectional view of the chassis of an overall flange processing device of the present invention;

[0026] Figure 3 It is an enlarged schematic view of part A in an overall flange processing device of the present invention Figure 2 of the present invention;

[0027] Figure 4 It is an enlarged schematic view of part B in an overall flange processing device of the present invention Figure 2 of the present invention;

[0028] Figure 5 It is an enlarged schematic view of part C in an overall flange processing device of the present invention Figure 2 of the present invention;

[0029] Figure 6 It is an enlarged schematic view of part D in an overall flange processing device of the present invention Figure 2 of the present invention.

[0030] In the figure: 1, chassis; 2, workbench; 3, grinding table; 4, air pump; 5, gear ring; 6, filter box; 7, electric slide rail 1; 8, electric slide rail 2; 9, electric slide rail 3; 10, moving frame; 11, motor 2; 12, grinding head; 13, movable slot; 14, clamping plate 1; 15, clamping plate 2; 16, vertical bar; 17, guide block; 18, guide slot; 19, air circuit; 20, piston cylinder; 21, piston rod; 22, spring; 23, U-shaped conduit; 24, reversing valve; 25, rotary joint; 26, shunt pipe; 27, exhaust pipe 1; 28, filter; 29, motor 1; 30, gear; 31, worm gear; 32, worm; 33, annular guide rail; 34, dust suction port; 35, negative pressure pump; 36, negative pressure pipe; 37, connecting pipe; 38, exhaust pipe 2; 39, exhaust port; 40, dustproof net; 41, placement slot; 42, filter box; 43, filter screen; 44, handle; 45, limit frame; 46, rubber dustproof belt; 47, hanging bracket; 48, boom. Detailed implementation manner

[0031] 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 creative efforts shall fall within the protection scope of the present invention.

[0032] As Figures 1-6 shown, the present invention provides a technical solution:

[0033] A flange processing device includes a chassis 1, with a workbench 2 fixedly connected to its top. A grinding mechanism is arranged directly below the top of the workbench 2. The grinding mechanism includes an electric slide rail 1 7 horizontally fixed on both sides of the workbench 2, and an electric slide rail 2 8 vertically arranged outside the electric slide rail 1 7. An electric slide rail 3 9 is arranged between the tops of the two electric slide rails 2 8. A moving frame 10 is arranged at the bottom of the electric slide rail 3 9. Among them, the electric slide rail 2 8 is fixedly connected to the slide block of the electric slide rail 1 7, the electric slide rail 3 9 is fixedly connected to the slide blocks of the two electric slide rails 2 8 on both sides, and the moving frame 10 is fixedly connected to the slide block of the electric slide rail 3 9. A motor 2 11 is fixedly connected to the top of the moving frame 10, and a grinding head 12 is fixedly connected to the output shaft of the motor 2 11. A filter box 6 is fixedly connected to the middle of the right inner wall of the chassis 1. A filtering mechanism is arranged inside the filter box 6. The filtering mechanism includes a dust suction port 34 arranged above the outside of the right side of the grinding table 3, and a negative pressure pump 35 fixedly connected to the lower part of the right inner wall of the chassis 1 through an armrest 48. The right side of the dust suction port 34 is fixedly connected to a negative pressure pipe 36. One end of the negative pressure pipe 36 away from the dust suction port 34 communicates with the upper end of the filter box 6. The top of the negative pressure pump 35 is fixedly connected to a connecting pipe 37. The top of the connecting pipe 37 extends to the inner bottom wall of the filter box 6. The bottom of the negative pressure pump 35 is fixedly connected to an exhaust pipe 2 38. The pipe orifice of the exhaust pipe 2 38 faces the air pump 4. An exhaust port 39 is fixedly installed in the middle of the left side of the chassis 1. A dustproof net 40 is fixedly installed inside the exhaust port 39. The filtering mechanism further includes a placement groove 41 opened on the right side of the chassis 1, and a filter box 42 movably installed between the filter box 6 and the placement groove 41. A filter screen 43 is fixedly installed at the bottom of the filter box 42. A handle 44 is fixedly installed on the outside of the right side of the filter box 42. Inside the filter box 6 and symmetrically arranged above the filter box 42 are limiting frames 45. The lower end surface of the limiting frame 45 is in sliding contact with the upper end surface of the filter box 42;

[0034] In this embodiment, through the combined use of the negative pressure pump 35, the filter box 6 and the air flow circulation system inside the chassis 1, the integrated treatment of metal dust collection and equipment heat dissipation is realized, achieving the technical effects of simplifying the equipment structure and improving the heat dissipation efficiency.

[0035] Such as Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown in the figure, there is a grinding table 3, which is rotatably arranged in the middle of the workbench 2. A two-way clamping mechanism is arranged on the grinding table 3. The two-way clamping mechanism includes four movable grooves 13 equally spaced in arc on the grinding table 3, and a clamping plate one 14 and a clamping plate two 15 symmetrically arranged at the upper ends on both sides inside the movable groove 13. The bottom ends of the clamping plate one 14 and the clamping plate two 15 are fixedly connected with vertical bars 16. Guide blocks 17 are fixedly connected to both sides in the middle of the vertical bars 16. Guide grooves 18 slidably matched with the guide blocks 17 are arranged on both sides of the inner wall of the movable groove 13. Rubber dust-proof belts 46 are fixedly connected between the clamping plate one 14 and the clamping plate two 15 and the upper wall surface of the movable groove 13. The two-way clamping mechanism further includes an air passage 19 opened in the inner side of the middle part and the outer peripheral inner side of the grinding table 3, and a piston cylinder 20 horizontally fixed outside the top end of the air passage 19. A piston rod 21 is horizontally fixed outside the bottom end of the vertical bar 16. A spring 22 elastically connected with the piston cylinder 20 is sleeved outside the piston rod 21. There is an air pump 4, which is fixedly installed on the inner bottom wall of the chassis 1. A rotary air supply mechanism is arranged between the air pump 4 and the two-way clamping mechanism. The rotary air supply mechanism includes a U-shaped conduit 23 arranged at the bottom end of the movable groove 13, and a reversing valve 24 fixedly connected to the middle of the U-shaped conduit 23. The two ends of the U-shaped conduit 23 are respectively connected to the air passages 19 in the inner side of the middle part and the outer peripheral inner side of the grinding table 3. The top end of the air pump 4 is fixedly connected with a rotary joint 25. The movable end of the rotary joint 25 is respectively communicated with four shunt pipes 26 through a five-way valve. The other ends of the four shunt pipes 26 are respectively communicated with the four reversing valves 24. The bottom end of the air pump 4 is fixedly connected with an exhaust pipe one 27. The bottom end of the exhaust pipe one 27 extends to the outside of the chassis 1 and is fixedly connected with a filter 28. There is a gear ring 5, which is fixedly connected to the outer bottom end of the grinding table 3. A rotating mechanism matched with the gear ring 5 is arranged below the left side of the workbench 2. The rotating mechanism includes a motor one 29 arranged below the left side of the workbench 2, and a gear 30 rotatably connected to the bottom end of the left side of the workbench 2 through a bearing. The gear 30 meshes with the gear ring 5. The outer shell of the motor one 29 is fixedly connected with the lower end surface of the workbench 2 through a hanger 47. A worm gear 31 is coaxially fixed to the bottom end of the gear 30. The output shaft of the motor one 29 is fixedly connected with a worm 32 meshing with the worm gear 31. The rotating mechanism further includes an annular guide rail 33 embedded and fixed at the inner ring of the workbench 2. The outer wall of the grinding table 3 is fixedly connected with the sliding seat of the annular guide rail 33;

[0036] In this embodiment, through the combined use of the reversing valve 24 and the two-way clamping mechanism, the flexible switching of three clamping modes of the clamping plate one 14 and the clamping plate two 15 is realized, the problem that the single-way clamping mechanism in the prior art cannot simultaneously meet the processing requirements of the inner ring, outer ring and end face of the flange is solved, and the technical effects of improving the processing accuracy and efficiency are achieved.

[0037] Working principle: The reversing valve 24 has three working positions. By precisely controlling the switching position of the reversing valve 24, three clamping modes can be achieved: When it is necessary to grind the outer ring of the flange, the reversing valve 24 is switched to the position where the inner gas path 19 in the middle of the grinding table 3 is connected. Compressed air pushes the clamping plate one 14 at the inner ring towards the inner ring of the flange to implement single-sided clamping. At this time, the clamping plate two 15 at the outer ring remains stationary, providing a machining space for the outer ring for the grinding head 12; When it is necessary to grind the inner ring of the flange, the reversing valve 24 is switched to the position where the inner gas path 19 on the outer periphery of the grinding table 3 is connected. Compressed air pushes the clamping plate two 15 at the outer ring towards the outer ring of the flange to implement single-sided clamping. At this time, the clamping plate one 14 at the inner ring remains stationary, ensuring that the grinding head 12 can penetrate into the inner ring of the flange for operation; When it is necessary to grind the end face of the flange, the reversing valve 24 is switched to the position where both the middle inner and outer peripheral inner gas paths 19 are connected. Compressed air simultaneously pushes the clamping plate one 14 and the clamping plate two 15 to move towards each other, achieving clamping of the flange from both the inner and outer rings simultaneously. At this time, the flange disc is fixed bidirectionally and can withstand the axial cutting force during end face grinding. The rotation system of the grinding table 3 is driven by the motor one 29 to rotate the worm 32. The worm 32 drives the worm gear 31 to make the gear 30 mesh with the gear ring 5, driving the grinding table 3 to rotate smoothly along the annular guide rail 33. The three-axis linkage system realizes lateral movement through the electric slide rail one 7, vertical adjustment through the electric slide rail two 8, and longitudinal feed through the electric slide rail three 9. The motor two 11 drives the grinding head 12 to rotate to complete precision grinding. When the negative pressure pump 35 is working, it generates negative suction, continuously sucking the metal chips and dust generated during the grinding process through the dust suction port 34. The dust-containing air flow enters the upper space of the filter box 6 through the negative pressure pipe 36. When passing through the filter screen 43, the metal chips and dust are effectively intercepted in the filter box 42, while the filtered normal-temperature clean air continues to flow downward and is discharged from the exhaust end of the negative pressure pump 35 through the connecting pipe 37. The exhaust pipe two 38 guides this part of the filtered clean air into the chassis 1. Since the equipment such as the air pump 4, negative pressure pump 35, and motor one 29 in the chassis 1 continuously operate and generate heat, raising the temperature of the internal air. When the normal-temperature air discharged from the exhaust pipe two 38 enters the chassis 1, it undergoes forced convection heat exchange with the hot air. On the one hand, the normal-temperature air flow directly flushes the surfaces of each heating component to take away heat, and on the other hand, it forms a directional air flow disturbance in the chassis 1, prompting the hot air and the gas after heat exchange to be discharged through the exhaust port 39 on the left side of the chassis 1. The dust-proof net 40 arranged inside the exhaust port 39 can effectively prevent external dust from entering the chassis 1.

[0038] It should be noted that in this document, 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 elements inherent to such process, method, article or device.

[0039] 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 flange processing device, characterized in that: including a chassis (1) with a workbench (2) fixedly connected to its top end, and a grinding mechanism is arranged directly below the top end of the workbench (2); a grinding table (3) rotatably arranged in the middle of the workbench (2), and a double-direction clamping mechanism is arranged on the grinding table (3); an air pump (4) fixedly installed on the inner bottom wall of the chassis (1), and a rotary air supply mechanism is arranged between the air pump (4) and the double-direction clamping mechanism; a gear ring (5) fixedly connected to the outer side of the bottom end of the grinding table (3), and a rotating mechanism matching the gear ring (5) is arranged below the left side of the workbench (2); a filter box (6) fixedly connected to the middle of the right inner wall of the chassis (1), and a filtering mechanism is arranged inside the filter box (6).

2. The flange processing equipment according to claim 1, characterized in that: The grinding mechanism includes electric slide rails one (7) horizontally fixed on both sides of the workbench (2), and electric slide rails two (8) vertically arranged on the outer sides of the electric slide rails one (7). An electric slide rail three (9) is arranged between the top ends of the two electric slide rails two (8). A moving frame (10) is arranged at the bottom end of the electric slide rail three (9). A motor two (11) is fixedly connected to the top end of the moving frame (10), and a grinding head (12) is fixedly connected to the output shaft of the motor two (11).

3. A flange processing device according to claim 1, characterized in that: The double-direction clamping mechanism includes four movable grooves (13) equally radian-opened on the grinding table (3), and clamping plates one (14) and clamping plates two (15) symmetrically arranged on the upper sides of both inner sides of the movable grooves (13). Vertical bars (16) are fixedly connected to the bottom ends of the clamping plates one (14) and the clamping plates two (15). Guide blocks (17) are fixedly connected to both sides of the middle parts of the vertical bars (16). Guide grooves (18) slidably matched with the guide blocks (17) are opened on both inner walls of the movable grooves (13). Rubber dust-proof belts (46) are fixedly connected between the clamping plates one (14) and the clamping plates two (15) and the upper wall surfaces of the movable grooves (13).

4. A flange processing device according to claim 3, characterized in that: The double-direction clamping mechanism further includes air paths (19) opened in the inner side of the middle part and the inner side of the outer periphery of the grinding table (3), and piston cylinders (20) horizontally fixed on the outer sides of the top ends of the air paths (19). A piston rod (21) is horizontally fixed on the outer side of the bottom end of the vertical bar (16), and a spring (22) elastically connected to the piston cylinder (20) is sleeved on the outer part of the piston rod (21).

5. The flanged disk processing device according to claim 3, characterized in that: The rotary air supply mechanism includes a U-shaped conduit (23) arranged at the bottom end of the movable groove (13), and a reversing valve (24) fixedly connected to the middle of the U-shaped conduit (23). The two ends of the U-shaped conduit (23) are respectively connected to the air paths (19) in the inner side of the middle part and the inner side of the outer periphery of the grinding table (3). A rotary joint (25) is fixedly connected to the top end of the air pump (4). The movable end of the rotary joint (25) is respectively communicated with four shunt pipes (26) through a five-way valve. The other ends of the four shunt pipes (26) are respectively communicated with four reversing valves (24). An exhaust pipe one (27) is fixedly connected to the bottom end of the air pump (4), and the bottom end of the exhaust pipe one (27) extends to the outside of the chassis (1) and is fixedly connected to a filter (28).

6. A flange processing device according to claim 1, characterized in that: The rotating mechanism includes a first motor (29) disposed below the left side of the workbench (2), and a gear (30) rotatably connected to the left bottom end of the workbench (2) through a bearing. The gear (30) meshes with a gear ring (5). The housing of the first motor (29) is fixedly connected to the lower end surface of the workbench (2) through a hanger (47). A worm gear (31) is coaxially fixed to the bottom end of the gear (30). The output shaft of the first motor (29) is fixedly connected to a worm (32) that meshes with the worm gear (31).

7. A flange processing device according to claim 6, characterized in that: The rotating mechanism further includes an annular guide rail (33) embedded and fixed at the inner circle of the workbench (2). The outer wall of the grinding table (3) is fixedly connected to the sliding seat of the annular guide rail (33).

8. A flange processing device according to claim 1, characterized in that: The filtering mechanism includes a dust suction port (34) disposed above the right side external of the grinding table (3), and a negative pressure pump (35) fixed to the lower part of the right inner wall of the chassis (1) through an armrest (48). The right side of the dust suction port (34) is fixedly connected to a negative pressure pipe (36). One end of the negative pressure pipe (36) away from the dust suction port (34) communicates with the upper end of the filter box (6). The top end of the negative pressure pump (35) is fixedly connected to a connecting pipe (37). The top end of the connecting pipe (37) extends to the inner bottom wall of the filter box (6).

9. A flange processing device according to claim 8, characterized in that: The bottom end of the negative pressure pump (35) is fixedly connected to a second exhaust pipe (38). The pipe orifice of the second exhaust pipe (38) faces the air pump (4). An exhaust port (39) is fixedly installed in the middle of the left side of the chassis (1). A dust-proof net (40) is fixedly installed inside the exhaust port (39).

10. A flange processing device according to claim 8, characterized in that: The filtering mechanism further includes a placement groove (41) opened on the right side of the chassis (1), and a filter box (42) movably installed between the filter box (6) and the placement groove (41). A filter screen (43) is fixedly installed at the bottom end of the filter box (42). A handle (44) is fixedly installed on the external right side of the filter box (42). Inside the filter box (6) and symmetrically disposed above the filter box (42) are limit frames (45). The lower end surface of the limit frame (45) is in sliding contact with the upper end surface of the filter box (42).

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