Clamping device for computer motherboard production

Abstract

The present invention discloses a clamping device for producing computer motherboards, which comprises a plurality of mounting plates arranged above a conveyor belt, wherein the conveyor belt is arranged between two mounting frames, a fixing plate is fixed on the two mounting frames, a processing device for processing computer motherboards is installed between the two fixing plates, and a plurality of support rods for supporting are arranged between the mounting plate and the conveyor belt, wherein the mounting plate is provided with a clamping assembly for clamping during the conveying and processing of the computer motherboard and a constant pressure protection assembly for constant pressure protection during the clamping process. In the process of clamping and fixing the computer motherboard, the clamping device for producing the computer motherboard of the present invention uses a constant pressure protection assembly to prevent the internal pressure of the circular airbag from continuously rising during the process of inflating and squeezing the computer motherboard, thereby causing excessive clamping force on the computer motherboard and causing deformation and damage thereof.

Description

Technical Field

[0001] The invention relates to the technical field of computer motherboard production, in particular to a clamping device for computer motherboard production. Background Art

[0002] The motherboard, also called the mainboard, system board, or motherboard, is one of the most basic and important components of a computer. The motherboard is generally a rectangular circuit board on which the main circuit systems that make up the computer are installed, generally including the BIOS chip, I / O control chip, keyboard and panel control switch interface, indicator light connector, expansion slot, DC power supply connector for the motherboard and plug-in cards, and other components.

[0003] When a computer motherboard is processed by processing equipment such as drilling, mounting and welding, it is necessary to use a clamping device to clamp and limit the computer motherboard to prevent it from shifting during the processing. However, since the computer motherboard itself has a low compressive strength, when it is clamped by a clamping device, the clamping force is often too large, causing the computer motherboard to deform or even be damaged, which is inconvenient for the processing operation of the computer motherboard.

[0004] Therefore, there is an urgent need for a clamping device for producing computer motherboards to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a clamping device for computer motherboard production to solve the problem raised in the above background technology that the computer motherboard is often deformed or even damaged due to excessive clamping force when clamping by the clamping device, which is inconvenient for the processing operation of the computer motherboard.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a clamping device for computer motherboard production, comprising a plurality of mounting plates arranged above a conveyor belt, wherein the conveyor belt is arranged between two mounting frames, a fixing plate is fixed on the two mounting frames, a processing equipment for computer motherboard processing is installed between the two fixing plates, and also comprising a plurality of support rods for support arranged between the mounting plate and the conveyor belt, wherein the mounting plate is provided with a clamping assembly for clamping the computer motherboard during the conveying and processing process and a constant pressure protection assembly for constant pressure protection during the clamping process.

[0007] The clamping assembly includes a mounting frame fixed to the upper end of a mounting plate, a mounting groove is provided on the inner side of the mounting frame, a circular airbag for clamping and limiting a computer motherboard is installed on the mounting groove, a placement plate is connected to the mounting plate via a connecting assembly, the placement plate is located inside the mounting frame, and an inflation assembly for inflating the inside of the circular airbag and an air intake assembly for maintaining the internal pressure of the circular airbag are provided on the mounting frame.

[0008] The inflation component is symmetrically arranged in two groups on the mounting frame, and the inflation component includes a piston tube installed on the mounting frame, one end of the piston tube is connected to the interior of the circular airbag, a piston plate is slidably connected to the piston tube, one end of the piston tube is slidably connected to a push rod, one end of the push rod is located inside the piston tube and fixed to the piston plate, a first spring is sleeved on the side wall of the push rod, and an extrusion component for extruding the push rod is arranged on the fixed plate.

[0009] The extrusion assembly comprises a strip plate fixed on a fixing plate, and first inclined surfaces for pressing against a push rod are arranged on both sides of the strip plate.

[0010] The constant pressure protection component includes an air leak pipe installed on a mounting frame, the air leak pipe is provided with a mounting hole, the mounting hole is communicated with the interior of the circular airbag, a conical surface is provided on the inner wall of the mounting hole, a sealing ball and a circular plate are provided inside the mounting hole, the circular plate is slidably connected to the interior of the mounting hole and has a plurality of through holes, a second spring is connected between the circular plate and the sealing ball, the sealing ball is pressed against the conical surface under the elastic force of the second spring to seal the air leak pipe and the interior of the circular airbag, and an adjustment component for adjusting the air leak pressure and an identification component for identifying the position during the adjustment process are provided on the air leak pipe.

[0011] The adjustment assembly includes a support plate fixed to one end of the deflation pipe, a threaded tube is fixed to the circular plate, a threaded rod is threadedly engaged with the threaded tube, the threaded rod is rotatably connected to the support plate, and a rotating pin is fixed to one end of the threaded rod.

[0012] The identification component comprises a slide groove provided on the deflation pipe, an indicator plate is slidably connected to the slide groove, one end of the indicator plate is fixed to the circular plate, and a scale bar for indicating plate position identification is arranged on one side of the slide groove.

[0013] The air intake assembly includes an air intake pipe installed on a mounting frame, the air intake pipe is connected to the interior of the circular airbag, a one-way valve is installed on the air intake pipe, and the conducting direction of the one-way valve is from the outside of the mounting frame to the inside of the circular airbag.

[0014] The connecting component includes a plurality of sliding rods slidably connected to the mounting plate, one end of each of the sliding rods is fixed to the placement plate, the other end of each of the sliding rods is fixed with a square plate, a third spring is sleeved on the side wall of each of the sliding rods, and a pushing component for pushing the square plate is provided on the mounting frame.

[0015] The pushing assembly comprises a pushing plate fixed on a mounting frame, and a second inclined surface for pushing the square plate is formed on the pushing plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The clamping device for computer motherboard production of the present invention, during the process of clamping and fixing the computer motherboard, uses a constant pressure protection component to prevent the internal pressure of the circular airbag from continuously rising during the process of inflating and squeezing the computer motherboard, causing excessive clamping force on the computer motherboard, causing deformation and damage to the computer motherboard. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic diagram of the structure of the extrusion assembly of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the clamping assembly, the constant pressure protection assembly and the adjustment assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the connection assembly of the present invention;

[0022] Figure 5 for Figure 1 The enlarged view of point A in the middle;

[0023] Figure 6 for Figure 1 The enlarged view of point B in the middle;

[0024] Figure 7 for Figure 2 Enlarged view of point C in the middle;

[0025] Figure 8 for Figure 3 The enlarged view of point D in the middle;

[0026] Fig. 9 for Figure 3 Enlarged view of point E in the middle.

[0027] In the figure: 1, mounting frame; 2, conveyor belt; 3, fixing plate; 4, processing equipment; 5, support rod; 601, mounting plate; 602, mounting frame; 603, mounting groove; 604, round airbag; 605, placement plate; 701, sliding rod; 702, square plate; 703, third spring; 901, piston tube; 902, piston plate; 903, push rod; 904, first spring; 1001, strip plate; 1002, first inclined surface ; 1101, vent pipe; 1102, mounting hole; 1103, conical surface; 1104, blocking ball; 1105, round plate; 1106, through hole; 1107, second spring; 1201, support plate; 1202, threaded pipe; 1203, threaded rod; 1204, rotating pin; 1301, slide groove; 1302, scale bar; 1303, indicator plate; 14, air inlet pipe; 1501, push plate; 1502, second inclined surface. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-9 The clamping device for computer motherboard production provided by the present invention includes a plurality of mounting plates 601 arranged above a conveyor belt 2, the conveyor belt 2 is arranged between two mounting frames 1, a fixing plate 3 is fixed on the two mounting frames 1, a processing equipment 4 for computer motherboard processing is installed between the two fixing plates 3, and also includes a plurality of support rods 5 for support arranged between the mounting plate 601 and the conveyor belt 2, and a clamping component for clamping the computer motherboard during the conveying and processing process and a constant pressure protection component for constant pressure protection during the clamping process are arranged on the mounting plate 601.

[0030] The clamping assembly includes a mounting frame 602 fixed on the upper end of a mounting plate 601, a mounting groove 603 is provided on the inner side of the mounting frame 602, a circular airbag 604 for clamping and limiting a computer motherboard is installed on the mounting groove 603, a placement plate 605 is connected to the mounting plate 601 through a connecting assembly, the placement plate 605 is located inside the mounting frame 602, an inflation assembly for inflating the inside of the circular airbag 604 and an air intake assembly for maintaining the internal pressure of the circular airbag 604 are provided on the mounting frame 602, the inside of the circular airbag 604 is inflated through the inflation assembly, so that the circular airbag 604 expands rapidly under the action of pressure and is pressed against the outer side of the computer motherboard placed on the placement plate 605, so that the computer motherboard is limited and fixed on the placement plate 605, which is convenient for the processing equipment 4 to stably process the computer motherboard.

[0031] Two groups of inflation components are symmetrically arranged on the mounting frame 602, and the inflation components include a piston tube 901 installed on the mounting frame 602, one end of the piston tube 901 is connected to the interior of the circular airbag 604, a piston plate 902 is slidably connected to the piston tube 901, and one end of the piston tube 901 is slidably connected to a push rod 903, one end of the push rod 903 is located inside the piston tube 901 and fixed to the piston plate 902, a first spring 904 is sleeved on the side wall of the push rod 903, and an extrusion component for extruding the push rod 903 is provided on the fixed plate 3, through the extrusion component, the piston plate 902 is forced on the piston tube 901 to move toward the circular airbag 604, and during the movement, part of the gas inside the piston tube 901 is pushed into the interior of the circular airbag 604 through the piston plate 902.

[0032] The extrusion assembly includes a strip plate 1001 fixed on the fixed plate 3, and first inclined surfaces 1002 for abutting and extruding the push rod 903 are arranged on both sides of the strip plate 1001. As the mounting frame 602 on the mounting plate 601 moves, one end of the push rod 903 abuts against the first inclined surface 1002 on the strip plate 1001, and the first inclined surface 1002 pushes and squeezes the push rod 903, so that the piston plate 902 is forced on the piston tube 901 to move toward the circular airbag 604.

[0033] The constant pressure protection component includes an air release pipe 1101 installed on the installation frame 602, and the air release pipe 1101 is provided with a mounting hole 1102, and the mounting hole 1102 is communicated with the interior of the circular airbag 604, and a conical surface 1103 is provided on the inner wall of the mounting hole 1102, and a blocking ball 1104 and a circular plate 1105 are provided inside the mounting hole 1102, and the circular plate 1105 is slidably connected to the interior of the mounting hole 1102 and has a plurality of through holes 1106, and a second spring 1107 is connected between the circular plate 1105 and the blocking ball 1104, and the blocking ball 1104 is pressed against the conical surface 1103 under the elastic force of the second spring 1107 to block the interior of the air release pipe 1101 and the circular airbag 604, and an adjustment component for adjusting the air release pressure and an identification component for identifying the position during the adjustment process are provided on the air release pipe 1101, and the circular airbag 604 is connected to the computer motherboard. After the collision, as the gas inside the circular airbag 604 increases, the pressure inside the circular airbag 604 continues to increase. When the pressure inside the circular airbag 604 is greater than the squeezing force of the second spring 1107 on the blocking ball 1104, the pressure inside the circular airbag 604 pushes the blocking ball 1104 to no longer resist the conical surface 1103. Part of the gas that rushes into the circular airbag 604 overflows outward through the gap between the conical surface 1103 and the blocking ball 1104 and the various through holes 1106 on the circular plate 1105, so that the pressure on the circular airbag 604 increases to a certain extent and then automatically deflates to the outside and maintains the pressure during deflation, forming a constant pressure protection component during the inflation and extrusion process of the circular airbag 604, to prevent the internal pressure of the circular airbag 604 from continuing to rise during the inflation and extrusion of the computer motherboard, causing excessive clamping force on the computer motherboard to cause deformation and damage.

[0034] The adjustment assembly includes a support plate 1201 fixed to one end of the deflation pipe 1101, a threaded tube 1202 fixed to the circular plate 1105, a threaded rod 1203 threadedly engaged with the threaded tube 1202, the threaded rod 1203 rotatably connected to the support plate 1201, a rotating pin 1204 fixed to one end of the threaded rod 1203, the threaded rod 1203 is driven to rotate by the rotating pin 1204, and during the rotation of the threaded rod 1203, the threaded rod 1203 and the threaded tube are connected. The mutual meshing transmission between 1202 drives the circular plate 1105 to move. Through the movement of the circular plate 1105, the deformation of the second spring 1107 between the circular plate 1105 and the conical surface 1103 is adjusted, and the extrusion force between the blocking ball 1104 and the conical surface 1103 is further adjusted, so that the blocking ball 1104 can be pushed to deflate under different pressures inside the circular airbag 604, which further facilitates the constant pressure protection component to be used for protection under different clamping pressures.

[0035] The identification component includes a slide groove 1301 opened on the vent pipe 1101, and an indicator plate 1303 is slidably connected to the slide groove 1301. One end of the indicator plate 1303 is fixed to the circular plate 1105. A scale bar 1302 for identifying the position of the indicator plate 1303 is provided on one side of the slide groove 1301. When the circular plate 1105 is moved under force, the indicator plate 1303 is driven to slide. During the sliding process, the position indicated by the indicator plate 1303 on the scale bar 1302 is used to facilitate identification of the adjusted position of the circular plate 1105.

[0036] The air intake assembly includes an air intake pipe 14 installed on the mounting frame 602, and the air intake pipe 14 is arranged to communicate with the interior of the circular airbag 604. A one-way valve is installed on the air intake pipe 14, and the conducting direction of the one-way valve is from the outside of the mounting frame 602 to the inside of the circular airbag 604. After the processing equipment 4 completes the processing of the computer mainboard, the computer mainboard is driven to move by the conveyor belt 2. During the movement, the push rod 903 no longer abuts against the first inclined surface 1002 and is reset under the elastic force of the first spring 904, so that the circular airbag 604 is no longer inflated and squeezed and returns to a normal state under the action of its own elastic force. At this time, the circular airbag 604 no longer clamps the computer mainboard. When the circular airbag 604 returns to a normal state, because the conducting direction of the one-way valve is from the outside of the mounting frame 602 to the inside of the circular airbag 604, part of the gas can be transported to the inside of the circular airbag 604 through the one-way valve inside the air intake pipe 14, so that the circular airbag 604 can return to a normal state.

[0037] The connecting component includes a plurality of sliding rods 701 slidably connected to the mounting plate 601, one end of each sliding rod 701 is fixed to the placement plate 605, and the other end of each sliding rod 701 is fixed to a square plate 702, and a third spring 703 is sleeved on the side wall of each sliding rod 701. A pushing component for pushing the square plate 702 is provided on the mounting frame 1. The lifting and lowering of the placement plate 605 is guided by each sliding rod 701, and the reset movement of the placement plate 605 after being subjected to force is facilitated by each third spring 703.

[0038] The pushing assembly includes a pushing plate 1501 fixed on the mounting frame 1, and a second inclined surface 1502 for pushing the square plate 702 is provided on the pushing plate 1501. As the conveyor belt 2 continues to transport the mounting plate 601, the square plate 702 is abutted against the second inclined surface 1502 on the pushing plate 1501. Through the interaction between the second inclined surface 1502 and the square plate 702, the square plate 702 is pushed toward the mounting plate 601. During the movement, the placement plate 605 is pushed out of the mounting frame 602 through each sliding rod 701. By pushing out the placement plate 605, it is convenient to remove the processed computer motherboard, which further facilitates the unloading operation.

[0039] Working principle: during the processing of the computer motherboard, the computer motherboard is sequentially placed on the placement plates 605 inside each mounting frame 602 above the conveyor belt 2. After placement, the computer motherboards placed on each placement plate 605 are transported toward the processing equipment 4 by the conveyor belt 2. During the transportation process, as the mounting frame 602 on the mounting plate 601 moves, one end of the push rod 903 abuts against the first inclined surface 1002 on the strip plate 1001. The first inclined surface 1002 pushes and squeezes the push rod 903, so that the piston plate 902 is forced on the piston tube 901 to move toward the round-shaped airbag 604. During the movement, part of the gas inside the piston tube 901 is pushed into the inside of the round-shaped airbag 604 by the piston plate 902, so that the round-shaped airbag 604 expands rapidly under the action of pressure and abuts against and squeezes the outer side of the computer motherboard placed on the placement plate 605, so that the computer motherboard is limited and fixed on the placement plate 605, which is convenient for the processing equipment 4 to stably process the computer motherboard.

[0040] After the circular airbag 604 is against the computer motherboard, as the gas inside the circular airbag 604 increases, the pressure inside the circular airbag 604 continues to increase. When the pressure inside the circular airbag 604 is greater than the squeezing force of the second spring 1107 on the blocking ball 1104, the blocking ball 1104 is pushed by the pressure inside the circular airbag 604 to no longer be against the conical surface 1103. Part of the gas that rushes into the circular airbag 604 overflows outward through the gap between the conical surface 1103 and the blocking ball 1104 and the various through holes 1106 on the circular plate 1105, so that the pressure on the circular airbag 604 increases to a certain extent and then automatically deflates to the outside and maintains the pressure during deflation, forming a constant pressure protection component during the inflation and extrusion process of the circular airbag 604, thereby preventing the internal pressure of the circular airbag 604 from continuing to rise during the inflation and extrusion of the computer motherboard. The rise causes excessive clamping force on the computer motherboard to cause deformation and damage, which further facilitates the processing operation of the computer motherboard. When the computer motherboard is clamped and protected by the constant pressure protection component, the threaded rod 1203 can be driven to rotate by rotating the pin 1204. During the rotation of the threaded rod 1203, the circular plate 1105 is driven to move through the mutual meshing transmission between the threaded rod 1203 and the threaded tube 1202. The deformation of the second spring 1107 between the circular plate 1105 and the conical surface 1103 is adjusted through the movement of the circular plate 1105, and the extrusion force between the blocking ball 1104 and the conical surface 1103 is further adjusted, so that the blocking ball 1104 can be pushed to deflate under different pressures inside the circular airbag 604, which further facilitates the constant pressure protection component to be used for protection under different clamping pressures;

[0041] After the processing equipment 4 completes the processing of the computer motherboard, the computer motherboard is driven to move by the conveyor belt 2. During the movement, the push rod 903 no longer abuts against the first inclined surface 1002 and is reset under the elastic force of the first spring 904, so that the circular airbag 604 is no longer inflated and squeezed and returns to a normal state under the action of its own elastic force. At this time, the circular airbag 604 no longer clamps the computer motherboard, and as the conveyor belt 2 continues to transport the mounting plate 601, the square plate 702 abuts against the second inclined surface 1502 on the push plate 1501. Through the interaction between the second inclined surface 1502 and the square plate 702, the square plate 702 is pushed toward the mounting plate 601. During the movement, the placement plate 605 is pushed out from the mounting frame 602 by each sliding rod 701. By pushing out the placement plate 605, it is convenient to remove the processed computer motherboard, which further facilitates the unloading operation.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. Clamping device for computer motherboard production, including: A plurality of mounting plates (601) are arranged above a conveyor belt (2), the conveyor belt (2) is arranged between two mounting frames (1), a fixing plate (3) is fixed on the two mounting frames (1), and a processing device (4) for processing a computer motherboard is installed between the two fixing plates (3); It is characterized by further comprising: A plurality of support rods (5) are arranged between the mounting plate (601) and the conveyor belt (2), wherein the mounting plate (601) is provided with a clamping assembly for clamping the computer motherboard during the conveying process and a constant pressure protection assembly for constant pressure protection during the clamping process; The clamping assembly comprises a mounting frame (602) fixed to the upper end of the mounting plate (601), a mounting groove (603) is provided on the inner side of the mounting frame (602), a circular airbag (604) for clamping and limiting the computer motherboard is installed on the mounting groove (603), a placement plate (605) is connected to the mounting plate (601) through a connecting assembly, the placement plate (605) is located inside the mounting frame (602), and an inflation assembly for inflating the inside of the circular airbag (604) and an air intake assembly for maintaining the internal pressure of the circular airbag (604) are provided on the mounting frame (602); The inflatable components are symmetrically arranged in two groups on the mounting frame (602), and the inflatable components include a piston tube (901) mounted on the mounting frame (602), one end of the piston tube (901) is connected to the inside of the circular airbag (604), a piston plate (902) is slidably connected to the piston tube (901), one end of the piston tube (901) is slidably connected to a push rod (903), one end of the push rod (903) is located inside the piston tube (901) and fixed to the piston plate (902), a first spring (904) is sleeved on the side wall of the push rod (903), and an extrusion component for extruding the push rod (903) is arranged on the fixed plate (3); The constant pressure protection component comprises an air release pipe (1101) mounted on the mounting frame (602), the air release pipe (1101) being provided with a mounting hole (1102), the mounting hole (1102) being communicated with the interior of the circular airbag (604), the inner wall of the mounting hole (1102) being provided with a conical surface (1103), the interior of the mounting hole (1102) being provided with a blocking ball (1104) and a circular plate (1105), the circular plate (1105) being slidably connected to the mounting hole A plurality of through holes (1106) are provided inside (1102), and a second spring (1107) is connected between the circular plate (1105) and the sealing ball (1104). Under the elastic force of the second spring (1107), the sealing ball (1104) is pressed against the conical surface (1103) to seal the inside of the deflation pipe (1101) and the circular airbag (604). The deflation pipe (1101) is provided with an adjustment component for adjusting the deflation pressure and an identification component for identifying the position during the adjustment process.

2. The clamping device for producing computer motherboards according to claim 1, characterized in that: The extrusion assembly comprises a strip plate (1001) fixed on a fixed plate (3), and first inclined surfaces (1002) for pressing against a push rod (903) are arranged on both sides of the strip plate (1001).

3. The clamping device for computer motherboard production according to claim 2, characterized in that: The adjustment assembly comprises a support plate (1201) fixed to one end of the vent pipe (1101), a threaded tube (1202) fixed to the circular plate (1105), a threaded rod (1203) threadedly engaged with the threaded tube (1202), the threaded rod (1203) rotatably connected to the support plate (1201), and a rotating pin (1204) fixed to one end of the threaded rod (1203).

4. The clamping device for producing computer motherboards according to claim 3, characterized in that: The identification component comprises a slide groove (1301) provided on the air release pipe (1101), an indicator plate (1303) being slidably connected to the slide groove (1301), one end of the indicator plate (1303) being fixed to the circular plate (1105), and a scale bar (1302) for identifying the position of the indicator plate (1303) being provided on one side of the slide groove (1301).

5. The clamping device for producing computer motherboards according to claim 4, characterized in that: The air intake assembly comprises an air intake pipe (14) mounted on a mounting frame (602), the air intake pipe (14) being connected to the interior of the circular air bag (604), and a one-way valve being mounted on the air intake pipe (14), the conduction direction of the one-way valve being from the outside of the mounting frame (602) to the inside of the circular air bag (604).

6. The clamping device for producing computer motherboards according to claim 5, characterized in that: The connection assembly comprises a plurality of sliding rods (701) slidably connected to the mounting plate (601), one end of each of the sliding rods (701) being fixed to the placement plate (605), the other end of each of the sliding rods (701) being fixed to a square plate (702), a third spring (703) being sleeved on the side wall of each of the sliding rods (701), and a pushing assembly for pushing the square plate (702) being provided on the mounting frame (1).

7. The clamping device for producing computer motherboards according to claim 6, characterized in that: The pushing assembly comprises a pushing plate (1501) fixed on the mounting frame (1), and a second inclined surface (1502) for pushing the square plate (702) is provided on the pushing plate (1501).

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