A pressure relay detection and adjustment test device

Abstract

The present invention discloses a pressure relay detection and adjustment test device, including a support table, an air box is installed on one side of the top of the support table, and an exhaust pipe is installed on one side of the top of the air box, an air valve is sleeved on the outer side of the exhaust pipe, one end of the exhaust pipe is connected to a data acquisition module, an air guide pipe is installed on the other side of the top of the air box, and an opening and closing valve is sleeved on the outer side of the air guide pipe. The pressure relay detection and adjustment test device rotates by manually rotating the second worm, and the second worm and the worm wheel are meshed with each other. Even if the worm wheel rotates synchronously, the two sets of driven gears are rotated. Under the meshing action of the driven gear and the tooth plate, even if the tooth plate moves horizontally, so as to drive the limit plate to move synchronously, until one side of the limit plate is attached to the relay body, the relay body can be clamped and limited to prevent it from shaking during detection and affecting the accuracy of its detection result.

Description

Technical Field

[0001] The invention relates to the technical field of relay detection, in particular to a pressure relay detection and adjustment test device. Background Art

[0002] The pressure relay is a component in the hydraulic system. It uses the pressure of the liquid to open and close the electrical contacts and convert the pressure into an electrical signal. When the system pressure reaches a predetermined value, the pressure relay will send an electrical signal to activate the electrical components, realize sequential actions or shut down the motor, etc. The pressure relay is widely used, such as in oil circuit pressure relief, reversing, safety protection and other fields:

[0003] In a sudden change pressure relay detection device with publication number CN114002593A, it involves the field of relay detection technology, including a base plate, and a gas generating module is installed on the top of the base plate, the side of the gas generating module close to its top is connected with a pressure relay through a gas guide bend and a flange, and the top of the gas generating module is connected with a data acquisition module installed on the top of the base plate through an electromagnetic valve and a guide pipe; it also includes: a supporting device, the supporting device is installed on the top of the base plate, and the pressure relay can be placed on the supporting device; a protective device, the protective device is installed on the base plate, and the data acquisition module is installed in the protective device; the supporting device of the present invention adjusts the position of the pressure relay above the base plate by sliding so that different sizes The pressure relay is connected to the gas generation module, and the protective device buffers the impact force of the data acquisition module to prevent the data acquisition module from being affected by the impact and affecting the acquisition accuracy; when the above-mentioned prior art is in use, the pressure relay is mainly supported and the position is adjusted by parts such as a trapezoidal bracket, a mounting rod, and a locking piece. However, in actual use, there is a lack of corresponding limit fixing settings to clamp and limit the relay, which may cause the relay to shake or even fall when the position of the relay is adjusted, reducing the stability of the pressure relay detection, and further easily affecting the accuracy of the pressure relay detection data. In addition, when the pressure relay is detected and adjusted, it is inconvenient to protect the relay. Therefore, further improvement and improvement are needed;

[0004] In a pressure detection device of a pressure relay with publication number CN201397375Y, a gas generation module, a detection module and a data acquisition module are connected in sequence; the detection module includes a connection plate, which is connected to the gas generation module; a control device and a connection device are arranged on the connection plate, and the connection plate is connected to the pressure relay through the connection device. The utility model solves the oil leakage problem of the traditional oil pressure opening relay, and also reduces the use of oil, reduces the detection cost, and has a simple structure and is easy to use, which can greatly improve the work efficiency of the operation. The above-mentioned prior art still has certain shortcomings when used: when it is used, it lacks corresponding support components for supporting detection, and the detection height of the pressure relay, that is, the detection position, is inconvenient to adjust, resulting in the inconvenience of the detection device to connect and detect with the pressure relay when encountering pressure relays of different specifications during detection, which reduces the flexibility of the device detection and causes inconvenience in use. Therefore, corresponding improvements are needed. Summary of the invention

[0005] The purpose of the present invention is to provide a pressure relay detection and adjustment test device to solve the problems that the existing pressure relay detection and adjustment test device proposed in the above background technology is inconvenient to fix the limit of the relay during use, the relay is prone to position displacement, and it is inconvenient to adjust the position of the relay during use.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure relay detection and adjustment test device, comprising a support platform, an air box is installed on one side of the top of the support platform, and an exhaust pipe is installed on one side of the top of the air box, an air valve is sleeved on the outer side of the exhaust pipe, one end of the exhaust pipe is connected to a data acquisition module, an air guide pipe is installed on the other side of the top of the air box, and an opening and closing valve is sleeved on the outer side of the air guide pipe, a support column is installed on the side of the top of the support platform away from the air box, and a lifting seat is sleeved on the outer side of the support column, a direct descending mechanism is arranged inside the lifting seat, and one side of the lifting seat is installed A support plate is provided, a positioning seat is installed at the top of the support plate, a transverse linkage component is arranged inside the positioning seat, the transverse linkage component includes a multi-directional drive mechanism, the multi-directional drive mechanism includes a second worm, and the second worm is arranged inside the positioning seat, one end of the second worm extends to the outside of the positioning seat, the top of the second worm is meshed with a worm wheel, and the inside of the worm wheel runs through a transverse rotating shaft, the outer side of the transverse rotating shaft is sleeved with a driven gear, and the top of the driven gear is meshed with a toothed plate, the top of the toothed plate is connected to the bottom end of the limit plate, and the end of the transverse rotating shaft away from the driven gear is arranged A bevel gear is installed, and a driving gear is meshed on one side of the bevel gear. A rotating shaft passes through the interior of the driving gear, and one end of the rotating shaft extends to the outside of the positioning seat. Connecting plates are installed on both sides of the top of the positioning seat, and a protective component is connected between the connecting plates. The protective component includes a protective mechanism, and the protective mechanism includes a through shaft, and the through shaft is arranged between two groups of connecting plates. One end of the through shaft is connected to one end of the connecting shaft, and both ends of the outer side of the through shaft are sleeved with flip frames, and protective card plates are evenly connected between the flip frames. One side of the flip frame is connected to an inner shield plate. The cross-section of the flip frame is hook-shaped, and multiple groups of protective card plates are arranged at equal intervals along the curvature direction of the flip frame. The flip frame and the protective card plates are made of yg8 tungsten steel hard alloy. A longitudinal linkage component is connected between the connecting plate and the positioning seat, and the longitudinal linkage component includes a rotating shaft that penetrates into the positioning seat, and a connecting shaft is installed at the top end of the outer side of the connecting plate above the rotating shaft, and sprockets are sleeved on the outer sides of the connecting shaft and the rotating shaft, and a transmission chain is connected between the sprockets, and a relay body is installed at the top of the positioning seat, and limit plates are installed on the positioning seats on both sides of the relay body.

[0007] Furthermore, two groups of driven gears are arranged on the outer side of the transverse rotating shaft, and the two groups of the transverse rotating shaft are symmetrically distributed with respect to the vertical center axis of the limiting plate.

[0008] Furthermore, the direct lowering mechanism includes a first worm gear, and the first worm gear is arranged inside the lifting seat, one end of the first worm gear extends to the outside of the lifting seat and is equipped with a rotating handle, the bottom end of the first worm gear is engaged with a linkage wheel, and one side of the linkage wheel is engaged with a driven rack, and the driven rack is arranged on one side of the support column.

[0009] Furthermore, a slide groove with a rectangular cross-section is provided on one side of the support column, and one end of the guide block slides inside the slide groove.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the pressure relay detection and adjustment test device is not only convenient for clamping and limiting the pressure relay, but also, while limiting, the protective mechanism is provided to perform synchronous movement, so as to provide a certain degree of shielding and protection for the pressure relay, so as to strengthen the protection of the pressure relay, and when testing the pressure relay, a direct drop mechanism is provided to adjust the height of the pressure relay, so that pressure relays of different specifications can be tested conveniently and efficiently;

[0011] Manually rotate the second worm to make it rotate, and the second worm and the worm wheel mesh with each other. Even if the worm wheel rotates synchronously, the two sets of driven gears rotate. Under the meshing action of the driven gear and the tooth plate, even if the tooth plate moves horizontally, so as to drive the limit plate to move synchronously, until one side of the limit plate is attached to the relay body, the relay body can be clamped and limited to prevent it from shaking during detection, which affects the accuracy of its detection results;

[0012] When the horizontal rotating shaft rotates, the bevel gear is driven to rotate synchronously. The bevel gear and the driving gear are meshed with each other. The driving gear and the rotating shaft rotate, that is, the sprocket on the rotating shaft rotates. In cooperation with the transmission chain, the connecting shaft can be rotated synchronously, driving the through shaft to rotate, that is, the flip frame performs a flipping motion. When the relay body is well limited, the flip frame and the inner shield plate flip to the top of the relay body to shield and protect the relay body. In addition, the setting of multiple sets of protective card plates on the flip frame can achieve a certain degree of anti-smashing effect, and the protection effect of the relay body is better.

[0013] When testing the relay body, the heights of relay bodies of different specifications are different. Therefore, in order to meet different testing requirements, the docking height of the relay body needs to be adjusted accordingly. The specific use process is: manually turn the handle to drive the first worm to rotate, and the first worms are engaged with each other, so that the linkage wheel rotates synchronously, the linkage wheel and the driven rack are engaged with each other, and the driven rack is fixed on the support column, so that the linkage wheel rotates and rises, that is, the lifting seat, the support plate and the relay body move synchronously, and the guide block and the slide groove on the support column cooperate with each other to improve the lifting stability of the lifting seat until the relay body is adjusted to a suitable height for normal testing. The operation is convenient, and during the lifting process of the lifting seat, the lifting seat position can be locked under the cooperation of the handle and the linkage wheel. The operation is convenient, can meet the detection and use of relay bodies of different specifications, and improves the use scope of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0016] Figure 3 It is a schematic diagram of the top view structure of the present invention;

[0017] Figure 4 For the present invention Figure 2 Schematic diagram of the structure at B in the middle;

[0018] Figure 5 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0019] Figure 6 It is a schematic diagram of the three-dimensional structure of the protection mechanism of the present invention;

[0020] Figure 7 It is a schematic diagram of the three-dimensional structure of the support column and the driven rack of the present invention.

[0021] In the figure: 1, support platform; 2, air box; 3, exhaust pipe; 4, air valve; 5, air guide pipe; 6, opening and closing valve; 7, relay body; 8, limit plate; 9, protection mechanism; 901, through shaft; 902, turning frame; 903, protection card plate; 904, inner shield plate; 10, connecting plate; 11, support column; 12, direct descending mechanism; 1201, turning handle; 1202, first worm; 1203, linkage wheel; 1204 , driven rack; 13, support plate; 14, positioning seat; 15, connecting shaft; 16, rotating shaft; 17, transmission chain; 18, lifting seat; 19, multi-directional driving mechanism; 1901, second worm; 1902, worm wheel; 1903, horizontal rotating shaft; 1904, driven gear; 1905, tooth plate; 1906, bevel gear; 1907, driving gear; 20, guide block; 21, sprocket; 22, data acquisition module. DETAILED DESCRIPTION

[0022] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0023] like Figure 1-7 As shown;

[0024] Example 1

[0025] A pressure relay detection and adjustment test device includes a support platform 1, an air box 2 is installed on one side of the top of the support platform 1, and an exhaust pipe 3 is installed on one side of the top of the air box 2, and an air valve 4 is sleeved on the outer side of the exhaust pipe 3, an air guide pipe 5 is installed on the other side of the top of the air box 2, and an opening and closing valve 6 is sleeved on the outer side of the air guide pipe 5, one end of the exhaust pipe 3 is connected to a data acquisition module 22, a support column 11 is installed on the side of the top of the support platform 1 away from the air box 2, and a lifting seat 18 is sleeved on the outer side of the support column 11, and the lifting seat 18 A straight-down mechanism 12 is arranged inside, a support plate 13 is installed on one side of the lifting seat 18, a positioning seat 14 is installed on the top of the support plate 13, a transverse linkage component is arranged inside the positioning seat 14, connecting plates 10 are installed on both sides of the top of the positioning seat 14, a longitudinal linkage component is connected between the connecting plates 10 and the positioning seat 14, a protective component is connected between the connecting plates 10, a relay body 7 is installed on the top of the positioning seat 14, and limit plates 8 are installed on the positioning seats 14 on both sides of the relay body 7; transverse The linkage assembly includes a multi-directional drive mechanism 19, which includes a second worm 1901, and the second worm 1901 is arranged inside the positioning seat 14, one end of the second worm 1901 extends to the outside of the positioning seat 14, the top of the second worm 1901 is meshed with a worm wheel 1902, and the inside of the worm wheel 1902 is penetrated by a horizontal shaft 1903, the outer side of the horizontal shaft 1903 is sleeved with a driven gear 1904, and the top of the driven gear 1904 is meshed with a tooth plate 1905, and the tooth plate The top of 1905 is connected to the bottom of the limiting plate 8; a bevel gear 1906 is installed at one end of the horizontal rotating shaft 1903 away from the driven gear 1904, and a driving gear 1907 is meshed on one side of the bevel gear 1906, and a rotating shaft 16 runs through the interior of the driving gear 1907, and one end of the rotating shaft 16 extends to the outside of the positioning seat 14; two groups of driven gears 1904 are arranged on the outside of the horizontal rotating shaft 1903, and the two groups of horizontal rotating shafts 1903 are symmetrically distributed about the vertical central axis of the limiting plate 8;

[0026] In this embodiment, when in use, the second worm 1901 is manually rotated to rotate, and the second worm 1901 and the worm wheel 1902 are meshed with each other, so that the worm wheel 1902 can rotate synchronously, and drive the horizontal rotating shaft 1903 and the driven gear 1904 to rotate, and the driven gear 1904 and the tooth plate 1905 are meshed with each other, so that the tooth plate 1905 can move horizontally, and then drive the limit plate 8 to move synchronously until the limit plate 8 is attached to the relay body 7, so as to limit the position of the relay body 7, avoid shaking and position deviation during detection, so as to improve the stability of the detection of the relay body 7, and help to improve the accuracy of the later detection data of the relay body 7;

[0027] In one embodiment, the longitudinal linkage component includes a rotating shaft 16 that penetrates into the interior of the positioning seat 14, a connecting shaft 15 is installed on the top of the outer side of the connecting plate 10 above the rotating shaft 16, and the outer sides of the connecting shaft 15 and the rotating shaft 16 are sleeved with sprockets 21, and a transmission chain 17 is connected between the sprockets 21, and the protection component includes a protection mechanism 9, the protection mechanism 9 includes a through shaft 901, and the through shaft 901 is arranged between the two groups of connecting plates 10, one end of the through shaft 901 is connected to one end of the connecting shaft 15, both ends of the outer side of the through shaft 901 are sleeved with a flip frame 902, and the flip frames 902 are evenly connected with protective card plates 903, and one side of the flip frame 902 is connected to an inner shield plate 904; the cross-section of the flip frame 902 is hook-shaped, and a plurality of protective card plates 903 are arranged at equal intervals along the arc direction of the flip frame 902, and the flip frame 902 and the protective card plates 903 are made of yg8 tungsten steel hard alloy;

[0028] In this embodiment, when in use, the longitudinal linkage assembly works synchronously under the driving action of the transverse assembly, that is, the rotating shaft 16 rotates synchronously under the cooperation of the bevel gear 1906 and the driving gear 1907, and the connecting shaft 15 rotates synchronously with the transmission chain 17, so that the through shaft 901, the flip frame 902, the protective card plate 903, and the inner shield plate 904 can be turned over, even if the inner shield plate 904 covers the top of the relay body 7 to block and protect it, the protective card plate 903 is a yg limit plate 8 tungsten steel hard alloy with high hardness and anti-smashing protection function;

[0029] Example 2

[0030] The difference between this embodiment and the support platform 1 of the embodiment is that while the relay body 7 is limited and protected, its flexibility of use needs to be improved. Therefore, the corresponding detection height of the relay body 7 needs to be adjusted accordingly, so that relay bodies 7 of different specifications can be connected to the air box 2 for detection. The direct descending mechanism 12 includes a first worm 1202, and the first worm 1202 is arranged inside the lifting seat 18. One end of the first worm 1202 extends to the outside of the lifting seat 18 and is equipped with a turning handle 1201. The bottom end of the first worm 1202 is meshed with a linkage wheel 1203, and one side of the linkage wheel 1203 is meshed with a driven rack 1204. The driven rack 1204 is arranged on one side of the support column 11; a slide groove with a rectangular cross-section is arranged on one side of the support column 11, and one end of the guide block 20 slides inside the slide groove.

[0031] In this embodiment, by rotating the handle 1201, the lifting seat 18 can be moved up and down under the mutual cooperation of the first worm 1202, the linkage wheel 1203, and the driven rack 1204 to adjust the height of the relay body 7. During the inspection, relay bodies 7 of different specifications can be inspected conveniently and efficiently, thereby improving the flexibility of the device.

[0032] Working principle: When using the pressure relay to detect and adjust the test device, such as Figure 1-7 As shown, when in use, the relay body 7 to be tested is placed on the positioning seat 14, and then the second worm 1901 is rotated to drive the worm wheel 1902 to rotate, that is, the horizontal rotating shaft 1903 and the driven gear 1904 rotate synchronously, and the driven gear 1904 and the tooth plate 1905 are meshed with each other, so that the tooth plate 1905 and the limit plate 8 move back and forth, so that the limit plate 8 is attached to the outer wall of the relay body 7, and then it is clamped and limited. In this process, the horizontal rotating shaft 1903 drives the bevel gear 1906 to rotate synchronously, and the bevel gear 1906 and the driving gear 1907 are meshed with each other, so that the driving gear 1907 and the rotating shaft 16 rotate synchronously, and cooperate with the sprocket 21 and the transmission chain 17 so that the connecting shaft 15 rotates synchronously, and then the through shaft 901, the flip frame 902, and the inner shield plate 904 are flipped synchronously, covering the top of the relay body 7 to shield and protect it;

[0033] Then, one side of the relay body 7 is connected to one end of the air guide pipe 5, and then gas is provided to the air box 2 through the external pipe, and then the opening and closing valve 6 is opened, that is, the relay body 7 is subjected to a certain air pressure. When the pressure value reaches a certain value, the opening and closing valve 6 is closed, and then the air valve 4 is opened to make the air flow flow from the exhaust pipe 3 into the data acquisition module 22, and the data is entered into the data acquisition module 22, so that the pressure detection action of the relay body 7 can be completed once, and the operation is convenient;

[0034] When the relay bodies 7 of different specifications are tested, the first worm 1202 is rotated by manually turning the handle 1201, and the first worm 1202 and the interlocking wheel 1203 cooperate with each other, so that the interlocking wheel 1203 rotates synchronously, and the interlocking wheel 1203 and the driven rack 1204 engage with each other. Even if the interlocking wheel 1203 rotates and lifts, so as to drive the lifting seat 18 and the relay body 7 to move synchronously, the detection height of the relay body 7 can be adjusted, so that relay bodies 7 of different specifications can be connected to the air guide tube 5 for testing, thereby improving the scope of use of the device.

[0035] It should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or components referred to must have specific directions, be constructed and operated in specific directions, and therefore cannot be understood as limitations on the protection content of the present invention. The standard parts used in the present invention can all be purchased on the market, and special-shaped parts can all be customized according to the instructions and the drawings. The specific connection methods of each part all adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0036] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure relay detection and adjustment test device, comprising a support platform (1), characterized in that: An air box (2) is installed on one side of the top of the support platform (1), and an exhaust pipe (3) is installed on one side of the top of the air box (2), an air valve (4) is sleeved on the outer side of the exhaust pipe (3), one end of the exhaust pipe (3) is connected to a data acquisition module (22), an air guide pipe (5) is installed on the other side of the top of the air box (2), and an opening and closing valve (6) is sleeved on the outer side of the air guide pipe (5), a support column (11) is installed on the side of the top of the support platform (1) away from the air box (2), and a lifting seat (18) is sleeved on the outer side of the support column (11), a direct descending mechanism (12) is arranged inside the lifting seat (18), a support plate (13) is installed on one side of the lifting seat (18), and a fixed position is installed on the top of the support plate (13). The positioning seat (14) is provided with a transverse linkage assembly inside, the transverse linkage assembly includes a multi-directional drive mechanism (19), the multi-directional drive mechanism (19) includes a second worm (1901), and the second worm (1901) is provided inside the positioning seat (14), one end of the second worm (1901) extends to the outside of the positioning seat (14), the top end of the second worm (1901) is meshed with a worm wheel (1902), and the inside of the worm wheel (1902) is penetrated by a transverse rotating shaft (1903), the outer side of the transverse rotating shaft (1903) is sleeved with a driven gear (1904), and the top end of the driven gear (1904) is meshed with a tooth plate (1905), and the tooth plate (1905) is The top end is connected to the bottom end of the limit plate (8); a bevel gear (1906) is installed at one end of the transverse rotating shaft (1903) away from the driven gear (1904), and a driving gear (1907) is meshed on one side of the bevel gear (1906); a rotating shaft (16) passes through the interior of the driving gear (1907); one end of the rotating shaft (16) extends to the outside of the positioning seat (14); connecting plates (10) are installed on both sides of the top end of the positioning seat (14); a protective component is connected between the connecting plates (10); the protective component includes a protective mechanism (9); the protective mechanism (9) includes a through shaft (901), and the through shaft (901) is arranged between the two groups of connecting plates (10); the through shaft (901) 01) is connected to one end of the connecting shaft (15), both ends of the outer side of the through shaft (901) are sleeved with a turning frame (902), and protective card plates (903) are evenly connected between the turning frames (902), one side of the turning frame (902) is connected to an inner shield plate (904), the cross-section of the turning frame (902) is hook-shaped, and the protective card plates (903) are arranged in multiple groups at equal intervals along the arc direction of the turning frame (902), the turning frame (902) and the protective card plates (903) are made of yg8 tungsten steel hard alloy, a longitudinal linkage component is connected between the connecting plate (10) and the positioning seat (14), and the longitudinal linkage component includes a rotating shaft (16) that penetrates into the interior of the positioning seat (14),A connecting shaft (15) is installed at the top end of the outer side of the connecting plate (10) above the rotating shaft (16), and sprockets (21) are sleeved on the outer sides of the connecting shaft (15) and the rotating shaft (16), and a transmission chain (17) is connected between the sprockets (21). A relay body (7) is installed at the top end of the positioning seat (14), and limit plates (8) are installed on the positioning seats (14) on both sides of the relay body (7).

2. A pressure relay detection and adjustment test device according to claim 1, characterized in that: Two groups of driven gears (1904) are arranged outside the transverse rotating shaft (1903), and the two groups of transverse rotating shafts (1903) are symmetrically distributed about the vertical center axis of the limiting plate (8).

3. A pressure relay detection and adjustment test device according to claim 1, characterized in that: The direct descending mechanism (12) comprises a first worm gear (1202), and the first worm gear (1202) is arranged inside the lifting seat (18), one end of the first worm gear (1202) extends to the outside of the lifting seat (18) and is installed with a rotating handle (1201), the bottom end of the first worm gear (1202) is meshed with a linkage wheel (1203), and one side of the linkage wheel (1203) is meshed with a driven rack (1204), and the driven rack (1204) is arranged on one side of the support column (11).

4. A pressure relay detection and adjustment test device according to claim 1, characterized in that: A sliding groove with a rectangular cross section is provided on one side of the support column (11), and one end of the guide block (20) slides inside the sliding groove.

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