Shell part leakage detection device

Abstract

The utility model relates to the field of automobile part detection, in particular to a shell part leakage detection device, which comprises a frame provided with two parallel supporting vertical plates. The lower detection assembly is supported on the supporting vertical plate and is provided with a bottom plate, a sealing seat and at least two lower guide sleeves are arranged at the lower end of the bottom plate, each lower guide sleeve is provided with a lower matching hole with an upward opening, a sealing ring groove is formed in the sealing seat, an elastic sealing gasket is arranged in the sealing ring groove, an air inlet is formed in the outer side wall of the sealing seat, and an air outlet is formed in the outer side wall of the sealing seat. The air inlet is communicated with the outer surface of the area defined by the sealing ring groove through an air inlet channel. The seat plate is in sliding fit with the rack and can slide back and forth in the vertical direction, and a sliding groove with a small opening and a large bottom is formed in the lower end of the seat plate; and the lower matching holes of the corresponding lower guide sleeves are locked by inserting and matching structures.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts detection, in particular to a shell part leakage detection device. Background Art

[0002] Some parts in a car require a sealing design. If the sealing performance of the car parts is not good enough, water leakage, oil leakage or air leakage will occur inside, causing the collapse of the entire car working system. For example, automobile parts often include a shell structure formed by welding multiple shells, which needs to maintain good airtightness during operation. Defects are prone to occur during molding, welding or assembly, and airtightness testing is required before entering the subsequent process. In the existing method, pressure testing is performed on a testing machine. During pressure testing, a set of openable upper pressure components and lower airtight components are required. To ensure the opening and closing accuracy, usually, the upper pressure components and the lower airtight components use a guide column matching structure to always maintain good guiding accuracy. At the same time, a limiting structure needs to be designed when closing. With this design, the upper pressure components and the lower airtight components need to be used as a set to form an integral structure, which cannot be replaced separately. In addition, the limiting structure can limit the closing position, but the space occupied by the pick-up and placement parts affects the pick-up and placement operations. At the same time, due to the high-beat production process, the guide column matching structure is easy to wear, and the entire set of guide structures needs to be replaced, which is costly. At the same time, the guide columns need to be accurately installed, which prolongs the maintenance time and affects the production efficiency. Summary of the invention

[0003] The purpose of the utility model is to provide a shell part leakage detection device in view of the deficiencies in the prior art. The device has a simple structure, can realize continuous production, has high efficiency, and reliable performance. The guide column is short in length and occupies a small height space when stored, which can facilitate the rapid installation of the entire device. The lower detection component or the upper detection component can be replaced and maintained separately, and the device has good interchangeability. The cooperation of the upper guide column and the lower guide sleeve can play a guiding role and also play a role of axial movement limiting. The device has a compact structural design. After the guide column fails, the column head can be quickly replaced, and the replacement is convenient and the cost is low.

[0004] The purpose of the utility model is achieved as follows: a housing parts leakage detection device, comprising:

[0005] A frame having two parallel supporting vertical plates;

[0006] The lower detection assembly supported on the supporting vertical plate comprises a bottom plate, a sealing seat and at least two lower guide sleeves are arranged at the lower end of the bottom plate, the lower guide sleeves have lower matching holes with openings facing upward, a sealing ring groove is arranged on the sealing seat, an elastic sealing pad is arranged in the sealing ring groove, an air inlet is arranged on the outer side wall of the sealing seat, and the air inlet is communicated with the outer surface of the area surrounded by the sealing ring groove through an air inlet channel;

[0007] The seat plate is slidably fitted on the frame and can slide back and forth in the vertical direction, and a sliding groove with a small mouth and a large bottom is arranged at the lower end thereof;

[0008] The upper detection assembly located above the lower detection assembly has an upper pad that is slidably matched in the slide groove, the side wall of the slide groove is provided with a clamping piece for clamping the upper pad, a feedable plug is provided on the upper pad, an upper guide column corresponding to the lower guide sleeve is provided on the upper pad, the upper guide column includes a column body and a column head detachably connected to the lower end of the column body, wherein the upper end of the column body is connected to the upper pad, the column head has a lower limit shoulder and a lower pin shaft section protruding from the lower limit shoulder, and the lower pin shaft section is used to be plugged and matched with the lower matching hole of the corresponding lower guide sleeve;

[0009] A detachable locking pin is arranged corresponding to the lower guide sleeve, and is transversely penetrated through the first positioning hole of the lower guide sleeve and the second positioning hole of the lower pin shaft section, so that the lower pin shaft section is plugged into and locked with the corresponding lower matching hole of the lower guide sleeve.

[0010] A lower mounting hole is provided at the lower end of the column body, and the column head includes an upper pin shaft section, a limiting flange section and a lower pin shaft section from top to bottom, wherein an upper limiting shoulder and a lower limiting shoulder are formed on both sides of the limiting flange respectively, and the upper pin shaft section is inserted into the lower mounting hole of the column body and connected and fixed.

[0011] The upper pin shaft section is provided with a wedge surface which gradually approaches the axial line of the column head from top to bottom, and the side wall of the lower mounting hole is provided with a first locking hole, in which a locking screw is fitted, and the inner extension section of the locking screw abuts against the wedge surface so that the upper pin shaft section has a tendency to move upward.

[0012] A guiding cone surface is arranged at the lower end portion of the lower pin shaft section.

[0013] A positioning cylindrical pin and a positioning rib pin are arranged on the sealing seat, and an annular observation groove is arranged on the pin bodies of the positioning cylindrical pin and the positioning rib pin.

[0014] The upper pad supports the support frame through downward supporting columns, and four clamping columns distributed in a matrix are arranged at the lower end of the support frame. The outer periphery of the support frame is connected to a cylinder, and the end of the piston rod of the cylinder is connected to a plug.

[0015] The side wall of the slide groove is provided with an installation groove which passes through the side wall horizontally, and the clamping piece is U-shaped, and the opening of the U-shape faces upward, wherein the end of the first side wall of the U-shape abuts against the bottom of the installation groove, and the end of the second side wall of the U-shape abuts against the lower bottom surface of the upper pad, and the bottom wall of the U-shape is provided with a tightening bolt hole, and the clamping piece is connected and fixed to the bottom wall of the installation groove by a tightening bolt which is clearance-matched in the tightening bolt hole.

[0016] The locking pin comprises a first section of the pin body and a second section of the pin body which are coaxially arranged, a limit block is arranged at the tail of the first section of the pin body, and the front end of the first section of the pin body is eccentrically hinged to the second section of the pin body.

[0017] The above scheme has the following beneficial effects: the utility model has a simple and compact structure, can realize continuous production, has high efficiency and reliable performance, the guide column is short in length, occupies a small height space when stored, can facilitate the rapid installation of the entire device, can replace and maintain the lower detection component or the upper detection component separately, and has good interchangeability. The cooperation of the upper guide column and the lower guide sleeve can not only play a guiding role, but also play a role of axial movement limiting. The structural design is compact, and after the guide column fails, the column head can be quickly replaced, and the replacement is convenient and the cost is low.

[0018] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 It is a rear view of the utility model;

[0022] Figure 4 It is a structural diagram of the column body;

[0023] Figure 5 It is a structural diagram of the column head;

[0024] Figure 6 It is a structural schematic diagram of the lower guide sleeve;

[0025] Figure 7 It is a structural schematic diagram of a pressing member;

[0026] Figure 8 Schematic diagram of the structure of the locking pin.

[0027] In the accompanying drawings, 100 is a frame, 110 is a supporting plate, 200 is a lower detection assembly, 210 is a bottom plate, 220 is a lower guide sleeve, 223 is an air inlet, 225 is a first positioning hole, 226 is a second positioning hole, 227 is a positioning cylindrical pin, 228 is a positioning prism pin, 229 is an observation groove, 240 is a sealing seat, 300 is a seat plate, 310 is a slide groove, 400 is an upper detection assembly, 410 is an upper pad, 411 is a support column, 412 is a support frame, 413 is a pressure Tightening column, 420 is the clamping piece, 421 is the tightening bolt hole, 430 is the upper guide column, 431 is the column body, 432 is the column head, 433 is the lower mounting hole, 440 is the wedge surface, 450 is the first locking hole, 460 is the plug, 2201 is the lower matching hole, 4321 is the lower limit shoulder, 4322 is the lower pin shaft section, 4323 is the upper pin shaft section, 4325 is the guide cone surface, 500 is the locking pin, 501 is the second section of the pin body, 502 is the hinge pin, and 3101 is the mounting groove. DETAILED DESCRIPTION

[0028] Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms center, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the terms first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as first and second can be used to explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of multiple is two or more. It should be noted that in practical applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or vertical effects are difficult to achieve. The description of vertical, parallel or same direction in this application is not an absolute limiting condition, but means that a vertical or parallel structural setting can be achieved within a preset error range and the corresponding preset effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution can be easy to implement and has high feasibility.

[0031] In the description of this specification, the description of reference terms such as one embodiment, some embodiments, examples, specific examples, or some examples means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0032] See also Figures 1 to 8 An embodiment of a housing part leakage detection device includes a lower detection assembly 200 and an upper detection assembly 400 of a frame 100. The frame 100 has two parallel supporting uprights 110, and the supporting uprights 110 can support the detection assembly.

[0033] The lower detection assembly 200 supported on the supporting vertical plate 110 comprises a bottom plate 210, a sealing seat 240 and at least two lower guide sleeves 220 are arranged at the lower end of the bottom plate 210, the lower guide sleeves 220 have lower matching holes 2201 with openings facing upward, a sealing ring groove is arranged on the sealing seat 240, an elastic sealing pad is arranged in the sealing ring groove, an air inlet 223 is arranged on the outer side wall of the sealing seat 240, and the air inlet 223 is communicated with the outer surface of the area surrounded by the sealing ring groove through an air inlet channel;

[0034] The seat plate 300 is slidably fitted on the frame 100 and can slide back and forth in the vertical direction, and a sliding groove 310 with a small mouth and a large bottom is arranged at the lower end thereof.

[0035] The upper detection component 400 located above the lower detection component 200 has an upper pad 410 that is slidably matched in the slide groove 310, and the side wall of the slide groove 310 is provided with a clamping member 420 for clamping the upper pad, and a feedable plug 460 is provided on the upper pad 410. An upper guide column 430 corresponding to the lower guide sleeve 220 is provided on the upper pad 410, and the upper guide column 430 includes a column body 431 and a column head 432 detachably connected to the lower end of the column body 431, wherein the upper end of the column body 431 is connected to the upper pad 410, and the column head 432 has a lower limit shoulder 4321 and a lower pin shaft section 4322 protruding from the lower limit shoulder 4321, and the lower pin shaft section 4322 is used for plugging and matching with the corresponding lower matching hole 2201 of the lower guide sleeve 220;

[0036] A detachable locking pin 500 is provided corresponding to the lower guide sleeve 220 , and is transversely penetrated through the first positioning hole 225 of the lower guide sleeve 220 and the second positioning hole 226 of the lower pin shaft section 4322 , so that the lower pin shaft section 4322 is plugged into and locked with the corresponding lower matching hole 2201 of the lower guide sleeve 220 .

[0037] Among them, the locking pin 500 can be a cylindrical pin or a cylindrical pin with a pin; of course, the locking pin 500 includes a first section pin body and a second section pin body 501 arranged coaxially, a limit block is set at the tail of the first section pin body, and the front end of the first section pin body is eccentrically hinged to the second section pin body 501; specifically, the first section pin body can be provided with an open mortise and tenon, and the second section pin body 501 is provided with a tenon, which is inserted into the mortise and tenon and hinged by a hinge pin 502. With this structure, after the second section of the pin body 501 passes through all the first positioning holes and the second positioning holes, due to the eccentric setting, the second section of the pin body 501 rotates around the hinge position under the influence of the eccentric gravity, so that the first section of the pin body and the second section of the pin body 501 cannot be coaxial, and even the second section of the pin body 501 is perpendicular to the first section of the pin body and cannot be loosened. When it is necessary to pull out the locking pin 500, the eccentric gravity is overcome, and the first section of the pin body and the second section of the pin body 501 are coaxial and can be loosened. No additional tools or auxiliary materials are required during the whole process, and it can be used quickly.

[0038] In some embodiments, in order to facilitate the replacement of the easily worn column head 432, a lower mounting hole 433 is set at the lower end of the column body 431, and the column head 432 includes an upper pin shaft section 4323, a limiting flange section and a lower pin shaft section 4322 from top to bottom, wherein an upper limit shoulder and a lower limit shoulder 4321 are formed on both sides of the limiting flange, respectively, and the upper pin shaft section 4323 is inserted into the lower mounting hole 433 of the column body 431 and connected and fixed. With this structure, the column head 432 can be radially positioned through the upper pin shaft section 4323 and the mounting hole, the upper limit shoulder can axially limit the column head 432 to withstand greater axial pressure, and the lower limit shoulder 4321 can abut against the lower guide sleeve 220 to limit the downward movement of the entire upper detection component 400.

[0039] In some embodiments, the upper pin shaft section 4323 is provided with a wedge surface 440 which gradually approaches the axis of the column head 432 from top to bottom, and the side wall of the lower mounting hole 433 is provided with a first locking hole 450, and a locking screw is matched in the first locking hole 450, and the inner extension section of the locking screw abuts against the wedge surface 440, so that the upper pin shaft section 4323 has a tendency to move upward. With this structure, the upper pin shaft section 4323 can be fully inserted into the lower mounting hole 433 and clamp the entire column head 432 together with the upper limit shoulder to avoid loose movement, so that its height position is stable, and it can ensure that multiple column heads 432 can be inserted into the lower guide sleeve 220 at the same time. It can also perform guiding and limiting at the same time to avoid the situation that some column heads 432 cannot be inserted into the lower matching due to the plug-in matching structure not matching at the same time. Of course, with this structure, the clamping and loosening of the upper pin shaft section 4323 can be achieved by adjusting the locking screw, which can be easily replaced, and the wedge surface matching structure can perform circumferential limiting and anti-rotation.

[0040] In some embodiments, a guide cone 4325 is provided at the lower end of the lower pin shaft section 4322. By providing the guide cone 4325, the column head 432 can be guided to be inserted, which can improve efficiency.

[0041] In some embodiments, a positioning cylindrical pin 227 and a positioning rib pin 228 are provided on the sealing seat 240, and an annular observation groove 229 is provided on the pin body of the positioning cylindrical pin 227 and the positioning rib pin 228. The workpiece can be positioned by the positioning cylindrical pin 227 and the positioning rib pin 228, wherein the positioning rib pin can stop rotation in the direction in which the workpiece rotates around the positioning cylindrical pin 227. The smaller contact area of ​​the positioning rib pin can also prevent over-positioning, prevent the workpiece from being stuck on the positioning pin, and avoid the situation where it is difficult to take and put.

[0042] In some embodiments, the upper pad 410 supports the support frame 412 through the downward support column 411, and four clamping columns 413 distributed in a matrix are arranged at the lower end of the support frame. The outer periphery of the support frame is connected to a cylinder, and the end of the piston rod of the cylinder is connected to a plug 460. Adopting this structure, it is convenient to independently process the upper pad 410, and its installation structure is relatively simple. At the same time, the entire support frame can be replaced for different products. At the same time, multiple installation positions are provided on the side of the support frame, which is convenient for the cylinder and other parts to be installed on the side wall of the support frame, and can avoid the situation where a bevel block is required when directly installed on the upper pad 410.

[0043] In some embodiments, the side wall of the slide groove 310 is provided with a mounting groove 3101 that runs through the side wall transversely, and the clamping member 420 is U-shaped, with the opening of the U-shaped member facing upward, wherein the end of the first side wall of the U-shaped member abuts against the bottom of the mounting groove 3101, and the end of the second side wall of the U-shaped member abuts against the lower bottom surface of the upper pad 410, and the bottom wall of the U-shaped member is provided with tension bolt holes 421421, and the clamping member 420 is connected and fixed to the bottom wall of the mounting groove 3101 through a tension bolt that fits the clearance in the tension bolt hole 421. With this structure, when the tension bolt is tightened, the clamping member 420 swings slightly around the end of the first side wall of the U-shaped member, so that the end of the second side wall of the U-shaped member can swing accordingly, and the upper pad 410 is always pressed, and its pressing force can be adjusted by the tension force of the tension bolt.

[0044] With the above scheme, during the initial installation process, the overall structure consisting of the upper detection component 400 and the seat plate 300 is first matched with the lower guide sleeve 220 of the lower detection component 200 through the column head 432, and is kept relatively stable by the locking pin 500 to form an assembly structure. The assembly structure is forked onto the supporting vertical plate by a forklift or the like, and the upper pad 410 is aligned with the slide groove 310 and slides into the slide groove 310. During the whole process, due to the cooperation between the upper guide column and the lower guide sleeve 220, the entire relative position is stable, ensuring the relative position of the upper detection component 400 and the lower detection component 200 when closed, and then the upper pad 410 is locked by the limit block. Of course, the lower end position of the lower detection component 200 is also determined. In some usage scenarios, the lower detection component 200 can be connected and fixed on the supporting plate 110 and always keep a stable position; in other usage scenarios, the lower detection component 200 can be directly placed on the supporting plate 110, and each time it is closed, the relative position can be quickly reconfirmed and adjusted. Of course, a detachable connection method can also be adopted. This method can adapt to the needs of multiple lower detection components 200 constantly circulating on the supporting plate 110, that is, after the lower detection component 200 completes the loading, it runs to the bottom of the upper detection component 400 for rapid testing. After the test is completed, the lower detection component 200 moves with the workpiece and picks up the workpiece at the next workstation, which can meet the needs of automated high-beat production and avoid the time occupied by picking up and placing workpieces under the upper detection component 400. When the upper guide post and the lower guide sleeve 220 are used in combination, the length of the guide post can be shortened to meet the test requirements. There is no need for the guide post and the lower guide sleeve 220 to always be in a coordinated state, and the processing cost of the entire guide post can be reduced. Only the column head 432 needs to be made of a higher-grade material, and it can be easily replaced after wear. Of course, this structure also facilitates the interchangeable use of different upper and lower detection components 200.

[0045] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. A housing parts leakage detection device, characterized in that: include: The frame (100) has two parallel supporting vertical plates (110); A lower detection assembly (200) supported on the supporting upright plate (110) comprises a bottom plate (210), a sealing seat (240) and at least two lower guide sleeves (220) being arranged at the lower end of the bottom plate (210), the lower guide sleeves (220) having a lower matching hole (2201) opening upward, a sealing ring groove being arranged on the sealing seat (240), an elastic sealing pad being arranged in the sealing ring groove, an air inlet (223) being arranged on the outer side wall of the sealing seat (240), the air inlet (223) being connected to the outer surface of the area surrounded by the sealing ring groove through an air inlet channel; A seat plate (300) is slidably fitted on the frame (100) and can slide back and forth in the vertical direction, and a sliding groove (310) with a small mouth and a large bottom is provided at the lower end thereof; The upper detection assembly (400) located above the lower detection assembly (200) comprises an upper pad (410) slidably fitted in the slide groove (310), a pressing member (420) for pressing the upper pad is arranged on the side wall of the slide groove (310), a feedable plug (460) is arranged on the upper pad (410), an upper guide column (430) corresponding to the lower guide sleeve (220) is arranged on the upper pad (410), and the upper guide column (430) ) comprises a column body (431) and a column head (432) detachably connected to the lower end of the column body (431), wherein the upper end of the column body (431) is connected to the upper pad (410), and the column head (432) has a lower limit shoulder (4321) and a lower pin shaft section (4322) protruding from the lower limit shoulder (4321), and the lower pin shaft section (4322) is used for plugging and mating with the lower mating hole (2201) of the corresponding lower guide sleeve (220); A detachable locking pin (500) is provided corresponding to the lower guide sleeve (220), and is transversely penetrated through the first positioning hole (225) of the lower guide sleeve (220) and the second positioning hole (226) of the lower pin shaft section (4322), so that the lower pin shaft section (4322) and the corresponding lower matching hole (2201) of the lower guide sleeve (220) are plugged into and locked in a matching structure.

2. The housing parts leakage detection device according to claim 1, characterized in that: A lower mounting hole (433) is provided at the lower end of the column body (431), and the column head (432) comprises, from top to bottom, an upper pin shaft section (4323), a limiting flange section and a lower pin shaft section (4322), wherein an upper limiting shoulder and a lower limiting shoulder (4321) are formed on both sides of the limiting flange respectively, and the upper pin shaft section (4323) is inserted into the lower mounting hole (433) of the column body (431) and connected and fixed.

3. The housing parts leakage detection device according to claim 2, characterized in that: The upper pin shaft section (4323) is provided with a wedge surface (440) which gradually approaches the axis line of the column head (432) from top to bottom, and the side wall of the lower mounting hole (433) is provided with a first locking hole (450). A locking screw is fitted in the first locking hole (450), and the inner extension section of the locking screw abuts against the wedge surface (440) so that the upper pin shaft section (4323) has a tendency to move upward.

4. The housing parts leakage detection device according to claim 2, characterized in that: A guiding cone surface (4325) is provided at the lower end of the lower pin shaft section (4322).

5. The housing parts leakage detection device according to claim 1, characterized in that: A positioning cylindrical pin (227) and a positioning rib pin (228) are provided on the sealing seat (240), and an annular observation groove (229) is provided on the pin bodies of the positioning cylindrical pin (227) and the positioning rib pin (228).

6. The housing parts leakage detection device according to claim 1, characterized in that: The upper pad (410) supports a support frame (412) via a downward supporting column (411), and four compression columns (413) distributed in a matrix are arranged at the lower end of the support frame. The outer periphery of the support frame is connected to a cylinder, and the end of the piston rod of the cylinder is connected to a plug (460).

7. The housing parts leakage detection device according to claim 1, characterized in that: The side wall of the slide groove (310) is provided with a mounting groove (3101) which passes through the side wall transversely, and the clamping member (420) is U-shaped, with the opening of the U-shape facing upward, wherein the end of the first side wall of the U-shape abuts against the bottom of the mounting groove (3101), and the end of the second side wall of the U-shape abuts against the lower bottom surface of the upper pad (410), and the bottom wall of the U-shape is provided with a tightening bolt hole (421), and the clamping member (420) is connected and fixed to the bottom wall of the mounting groove (3101) by a tightening bolt which is loosely matched in the tightening bolt hole (421).

8. The housing parts leakage detection device according to claim 1, characterized in that: The locking pin (500) comprises a first pin body section and a second pin body section (501) which are coaxially arranged, a limit block is provided at the tail of the first pin body section, and a front end of the first pin body section is eccentrically hinged to the second pin body section (501).

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