A rotor surface synchronous magnet steel pasting device

Abstract

The application discloses a kind of rotor surface synchronous magnet steel equipment, including magnet steel preparation mechanism, the magnet steel ejection mechanism being arranged at one side of magnet steel preparation mechanism, the magnet steel feeding mechanism being arranged at one side of magnet steel preparation mechanism, the Y-axis moving mechanism being arranged below magnet steel feeding mechanism, the magnet steel clamping mechanism being arranged at one side of magnet steel feeding mechanism, the magnet steel mechanism being arranged at one side of magnet steel clamping mechanism, the Y-axis moving mechanism is connected with magnet steel feeding mechanism and is arranged in parallel with magnet steel preparation mechanism.The beneficial effects of the present application are that the feeding, clamping, installation and attachment operations of the magnet steel sheet can be completed well, with high efficiency and high degree of automation, facilitating enterprise popularization and use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotor surface magnet steel, in particular to a rotor surface synchronous magnet steel equipment. BACKGROUND

[0002] In recent years, with the continuous rise of new energy, the equipment using electricity as energy has occupied a large share of the market. The most obvious is the rise of new energy vehicles. Under the promotion of the recent high oil prices, the demand for new energy vehicles has reached a new high, and the number of new energy vehicles has exceeded 100 million. The demand is huge, and the number of new energy vehicles is growing rapidly. The main driving device of new energy vehicles is the motor, and the number of components such as rotor, stator, core, bearing and other components that make up the motor will increase exponentially with the increase in the number of motors. The existing magnet steel equipment has poor use effect, low efficiency, and poor magnet steel mounting effect, which cannot meet the long-term use needs of people.

[0003] In view of the above situation, it is necessary to improve the existing rotor surface magnet steel method so that it can adapt to the needs of using the rotor surface magnet steel. SUMMARY

[0004] The purpose of the present application is to solve the above problems, and a rotor surface synchronous magnet steel equipment is designed.

[0005] To achieve the above purpose, the technical scheme of the present application is a rotor surface synchronous magnet steel equipment, which comprises a magnet steel preparation mechanism, a magnet steel ejection mechanism arranged on one side of the magnet steel preparation mechanism, a magnet steel feeding mechanism arranged on one side of the magnet steel preparation mechanism, a Y-axis moving mechanism arranged below the magnet steel feeding mechanism, a magnet steel clamping mechanism arranged on one side of the magnet steel feeding mechanism, and a magnet steel clamping mechanism arranged on one side of the magnet steel clamping mechanism. The Y-axis moving mechanism is connected with the magnet steel feeding mechanism and is arranged in parallel with the magnet steel preparation mechanism.

[0006] Further supplement to the technical scheme, the position adjusting mechanism is arranged below the magnet steel preparation mechanism, the magnet steel preparation mechanism is connected with the position adjusting mechanism, the Y-axis moving mechanism is arranged in parallel with the position adjusting mechanism, and the vertical direction of one side of the position adjusting mechanism is provided with a vertical plate, the vertical plate is provided with a positioning hole for positioning the magnet steel feeding mechanism, and the magnet steel ejection mechanism is arranged vertically with the position adjusting mechanism.

[0007] Further supplement to the technical solution, the magnetic steel feeding mechanism comprises a rotating mechanism, a connecting mechanism connected with the rotating mechanism, a magnetic steel sheet storage mechanism arranged on the connecting mechanism, a control mechanism connected with the magnetic steel sheet storage mechanism, and a pushing mechanism arranged below the magnetic steel sheet storage mechanism.

[0008] Further supplement to the technical solution, the rotating mechanism comprises a gear and rack module connected with the connecting mechanism.

[0009] Further supplement to the technical solution, the magnetic steel sheet storage mechanism is provided with a positioning column at the center position, the positioning column is arranged in cooperation with a positioning hole so that the positioning column can be installed in the positioning hole, the control mechanism is connected with the magnetic steel sheet storage mechanism through a belt and can control the rotation of the magnetic steel sheet storage mechanism, a plurality of magnetic steel sheet storage holes are arranged in an array on the magnetic steel sheet storage mechanism, the pushing mechanism comprises a first control air cylinder and a plurality of push plates connected with the first control air cylinder, the push plates are arranged below the magnetic steel sheet storage holes and can move up and down in the magnetic steel sheet storage holes.

[0010] Further supplement to the technical solution, the magnetic steel clamping mechanism comprises an X-axis moving mechanism, a Z-axis moving mechanism connected with the X-axis moving mechanism, a magnetic steel sheet fixing mechanism connected with the Z-axis moving mechanism, and a magnetic steel sheet clamping mechanism connected with the Z-axis moving mechanism, the magnetic steel sheet fixing mechanism is arranged outside the magnetic steel sheet clamping mechanism.

[0011] Further supplement to the technical solution, the magnetic steel sheet clamping mechanism comprises a second control air cylinder and an insertion module connected with the second control air cylinder, the second control air cylinder is fixedly installed on the Z-axis moving mechanism, and the magnetic steel sheet fixing mechanism is arranged outside the insertion module.

[0012] Further supplement to the technical solution, the magnetic steel sheet fixing mechanism comprises a third control air cylinder, a clamping jaw mechanism connected with the third control air cylinder, and a guide block arranged inside the clamping jaw mechanism, the guide block is provided with a plurality of positioning grooves, one positioning groove corresponds to one magnetic steel sheet, and one positioning groove corresponds to one clamping jaw mechanism.

[0013] Further supplement to the technical solution, the magnet steel mechanism includes a bottom plate, a positioning block arranged at the center of the bottom plate, a magnetic block bonding mechanism arranged on the bottom plate and located in the circumferential direction of the positioning block, and a positioning mechanism arranged on the bottom plate and located in the circumferential direction of the positioning block. The rotor assembly is installed in the positioning block. The magnetic block bonding mechanism includes a fourth control air cylinder, a first air cylinder connecting block connected with the fourth control air cylinder, an outer turntable connected with the first air cylinder connecting block, and a plurality of magnetic steel pressing mechanisms arranged on the outer turntable. A plurality of first waist-shaped grooves are arranged on the outer turntable in an array. The magnetic steel pressing mechanisms are connected with the outer turntable through the first waist-shaped grooves. The number of magnetic steel pressing mechanisms is the same as the number of magnetic steel sheets. The positioning mechanism includes a fifth control air cylinder, a second air cylinder connecting block connected with the fifth control air cylinder, an inner turntable connected with the second air cylinder connecting block, and a positioning block mechanism connected with the inner turntable. A plurality of second waist-shaped grooves are arranged on the inner turntable in an array. The positioning block mechanism is installed in the second waist-shaped grooves and can move therein. The positioning mechanism acts between adjacent magnetic steel sheets.

[0014] Further supplement to the technical solution, the bottom plate below the rotor assembly installed magnetic steel sheet is also provided with a magnetic steel sheet height adjusting mechanism, and the rotor assembly is also provided with a product height adjusting mechanism below.

[0015] Its beneficial effects are that the feeding, clamping, installation and attachment of the magnetic steel sheet can be well completed, the efficiency is high, the automation degree is high, and it is convenient for enterprises to popularize and use. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 is a schematic diagram of the installation structure of the magnetic steel preparation mechanism, the magnetic steel ejection mechanism, the magnetic steel feeding mechanism and the Y-axis moving mechanism of the present application;

[0018] Figure 3 is a schematic diagram of the magnetic steel clamping mechanism of the present application;

[0019] Figure 4 is a schematic diagram of the magnetic steel sheet fixing mechanism and the magnetic steel sheet clamping mechanism of the present application;

[0020] Figure 5 is a first angle structure schematic diagram of the magnet steel mechanism of the present application;

[0021] Figure 6 is a second angle structure schematic diagram of the magnet steel mechanism of the present application;

[0022] In the figure, 1, magnetic steel preparation mechanism; 2, magnetic steel ejection mechanism; 3, magnetic steel feeding mechanism; 31, rotating mechanism; 32, connecting mechanism; 33, magnetic steel sheet storage mechanism; 331, positioning column; 332, magnetic steel sheet storage hole; 34, control mechanism; 35, push-out mechanism; 351, first control cylinder; 352, push plate; 4, Y-axis moving mechanism; 5, magnetic steel clamping mechanism; 51, X-axis moving mechanism; 52, Z-axis moving mechanism; 53, magnetic steel sheet fixing mechanism; 531, third control cylinder; 532, clamping jaw mechanism; 533, guide block; 54, magnetic steel sheet clamping mechanism; 541, second control cylinder; 542, insertion module; 6, magnetic steel sticking mechanism; 61, bottom plate; 62, positioning block; 63, magnetic block bonding mechanism; 631, fourth control cylinder; 632, first cylinder connecting block; 633, outer turntable; 634, magnetic steel pressing mechanism; 64, positioning mechanism; 641, fifth control cylinder; 642, second cylinder connecting block; 643, inner turntable; 644, positioning block mechanism; 65, magnetic steel sheet height adjusting mechanism; 66, product height adjusting mechanism; 7, position adjusting mechanism; 8, vertical plate; 9, positioning hole. DETAILED DESCRIPTION

[0023] In order to make the technical personnel in the art more clearly understand the technical solution, the technical solution of the present application will be described in detail below in combination with the accompanying drawings. Figure 1 The technical solution of the present application is described in detail as follows:

[0024] A kind of synchronous magnetic steel equipment of rotor surface, including magnetic steel preparation mechanism 1, magnetic steel ejection mechanism 2 being arranged in one side of magnetic steel preparation mechanism 1, magnetic steel feeding mechanism 3 being arranged in one side of magnetic steel preparation mechanism 1, Y-axis moving mechanism 4 being arranged below magnetic steel feeding mechanism 3, magnetic steel clamping mechanism 5 being arranged in one side of magnetic steel feeding mechanism 3, magnetic steel sticking mechanism 6 being arranged in one side of magnetic steel clamping mechanism 5, the Y-axis moving mechanism 4 is connected with magnetic steel feeding mechanism 3 and is arranged in parallel with magnetic steel preparation mechanism 1, magnetic steel preparation mechanism 1 can prepare for magnetic steel sheet, it is convenient subsequent feeding, magnetic steel ejection mechanism 2 can be ejected to the magnetic steel sheet on magnetic steel preparation mechanism 1 Operation, so that magnetic steel sheet is installed to magnetic steel feeding mechanism 3, wherein Y-axis moving mechanism 4 can facilitate magnetic steel feeding mechanism 3 to the comprehensive feeding of magnetic steel sheet, use effect is good, magnetic steel clamping mechanism 5 can clamp the magnetic steel sheet on magnetic steel feeding mechanism 3, then it is placed on magnetic steel sticking mechanism 6, completes magnetic steel sticking operation, degree of automation is high, use effect is good.

[0025] The structure of the magnetic steel preparation mechanism 1 will be described in detail below. The magnetic steel preparation mechanism 1 is provided below with a position adjusting mechanism. The magnetic steel preparation mechanism 1 is connected with the position adjusting mechanism. The Y-axis moving mechanism 4 is arranged in parallel with the position adjusting mechanism 7. One side of the position adjusting mechanism 7 is provided in the vertical direction with a vertical plate 8. The vertical plate 8 is provided with a positioning hole 9 for positioning the magnetic steel feeding mechanism 3. The magnetic steel ejection mechanism 2 is arranged vertically with the position adjusting mechanism. Since there are many groups of the magnetic steel preparation mechanism 1, in order to provide feeding efficiency, the position adjusting mechanism 7 can control the movement of the magnetic steel preparation mechanism 1, so that the magnetic steel sheets thereon can be better installed on the magnetic steel feeding mechanism 3. During work, in order to prevent the magnetic steel feeding mechanism 3 from shifting, the positioning hole 9 can better position the magnetic steel feeding mechanism 3, and the feeding is more accurate.

[0026] The structure of the magnetic steel feeding mechanism 3 will be described in detail below. The magnetic steel feeding mechanism 3 comprises a rotating mechanism 31, a connecting mechanism 32 connected with the rotating mechanism 31, a magnetic steel sheet storage mechanism 33 arranged on the connecting mechanism 32, a control mechanism 34 connected with the magnetic steel sheet storage mechanism 33, a pushing-out mechanism 35 arranged below the magnetic steel sheet storage mechanism 33, the rotating mechanism 31 is installed on the Y-axis moving mechanism 4, the connecting mechanism 32 is fixedly connected with the rotating mechanism 31, the control mechanism 34 is fixedly installed on the connecting mechanism 32, the pushing-out mechanism 35 is connected with the magnetic steel sheet storage mechanism 33, the magnetic steel sheet storage mechanism 33 is circular in cross section, so as to facilitate feeding of the arrayed magnetic steel sheets thereon, the rotating mechanism 31 can control the overall rotation of the device, the control mechanism 34 can control the rotation of the magnetic steel sheet storage mechanism 33, thereby completing the feeding of all the magnetic steel sheets thereon, the pushing-out mechanism 35 can push out the magnetic steel sheets on the magnetic steel sheet storage mechanism 33, and the magnetic steel clamping mechanism 5 can clamp the magnetic steel sheets, wherein the rotating mechanism 31 comprises a gear and rack module, and the gear and rack module is connected with the connecting mechanism 32; the magnetic steel sheet storage mechanism 33 is provided with a positioning column 331 at the center position, the positioning column 331 is arranged in cooperation with a positioning hole so that the positioning column 331 can be installed in the positioning hole, the control mechanism 34 is connected with the magnetic steel sheet storage mechanism 33 through a belt and can control the rotation of the magnetic steel sheet storage mechanism 33, the magnetic steel sheet storage mechanism 33 is arrayed with a plurality of magnetic steel sheet storage holes 332, the pushing-out mechanism 35 comprises a first control air cylinder 351 and a plurality of push plates 352 connected with the first control air cylinder 351, the push plates 352 are arranged below the magnetic steel sheet storage holes 332 and can move up and down in the magnetic steel sheet storage holes 332, the magnetic steel sheet storage holes 332 can store magnetic steel sheets, the positioning column 331 cooperates with the positioning hole to position the magnetic steel feeding mechanism 3, facilitating better installation of the magnetic steel sheets, the control mechanism 34 is arranged to facilitate installation of the arrayed magnetic steel sheet storage holes 332, the rotating device can control the horizontal or vertical arrangement of the magnetic steel sheet storage mechanism 33, that is, when the magnetic steel sheets need to be fed, the rotating mechanism 31 rotates to arrange the magnetic steel sheet storage mechanism 33 vertically, after the feeding of the magnetic steel sheets is completed, the rotating mechanism 31 controls the magnetic steel sheet storage mechanism 33 to be arranged horizontally, facilitating the clamping operation of the magnetic steel clamping mechanism 5 on the magnetic steel sheets.

[0027] The structure of the magnetic steel clamping mechanism 5 will be described in detail below. The magnetic steel clamping mechanism 5 includes an X-axis moving mechanism 51, a Z-axis moving mechanism 52 connected to the X-axis moving mechanism 51, a magnetic steel sheet fixing mechanism 53 connected to the Z-axis moving mechanism 52, and a magnetic steel sheet clamping mechanism 54 connected to the Z-axis moving mechanism 52. The magnetic steel sheet fixing mechanism 53 is arranged outside the magnetic steel sheet clamping mechanism 54. The magnetic steel sheet clamping mechanism 54 includes a second control air cylinder 541 and an insertion module 542 connected to the second control air cylinder 541. The second control air cylinder 541 is fixedly installed on the Z-axis moving mechanism 52. The magnetic steel sheet fixing mechanism 53 is arranged outside the insertion module 542. The magnetic steel sheet fixing mechanism 53 includes a third control air cylinder 531, a jaw mechanism 532 connected to the third control air cylinder 531, and a guide block 533 arranged inside the jaw mechanism 532. The guide block 533 is provided with a plurality of positioning grooves. One positioning groove corresponds to one magnetic steel sheet, and one positioning groove corresponds to one jaw mechanism 532. During operation, the magnetic steel clamping mechanism 5 moves to the top of the magnetic steel feeding mechanism 3. Then, the Z-axis moving mechanism 52 works until the magnetic steel sheet fixing mechanism 53 contacts the magnetic steel sheet storage mechanism 33. Then, the push-out mechanism 35 pushes the magnetic steel sheet out of the magnetic steel sheet storage mechanism 33 until it is pushed under the magnetic steel sheet clamping mechanism 54. Then, the magnetic steel sheet fixing mechanism 53 is controlled to fix the magnetic steel sheet. When moving to the magnetic steel attaching mechanism 6, the magnetic steel sheet fixing mechanism 53 works to stop the contact between the jaw mechanism 532 and the magnetic steel sheet. The magnetic steel sheet clamping mechanism 54 pushes the magnetic steel sheet into the magnetic steel attaching mechanism 6.

[0028] The structure of the magnet steel mechanism 6 will be described in detail below. The magnet steel mechanism 6 comprises a bottom plate 61, a positioning block 62 arranged at the center of the bottom plate 61, a magnet block bonding mechanism 63 arranged on the bottom plate 61 and located in the circumferential direction of the positioning block 62, and a positioning mechanism 64 arranged on the bottom plate 61 and located in the circumferential direction of the positioning block 62. The rotor assembly is installed in the positioning block 62. The magnet block bonding mechanism 63 comprises a fourth control air cylinder 631, a first air cylinder connecting block 632 connected with the fourth control air cylinder 631, an outer rotating disc 633 connected with the first air cylinder connecting block 632, and a plurality of magnet steel pressing mechanisms 634 arranged on the outer rotating disc 633. A plurality of first waist-shaped grooves are arranged on the outer rotating disc 633 in an array. The magnet steel pressing mechanisms 634 are connected with the outer rotating disc 633 through the first waist-shaped grooves. The number of magnet steel pressing mechanisms 634 is the same as the number of magnet steel sheets. The positioning mechanism 64 comprises a fifth control air cylinder 641, a second air cylinder connecting block 642 connected with the fifth control air cylinder 641, an inner rotating disc 643 connected with the second air cylinder connecting block 642, and a positioning block mechanism 644 connected with the inner rotating disc 643. A plurality of second waist-shaped grooves are arranged on the inner rotating disc 643 in an array. The positioning block mechanism 644 is installed in the second waist-shaped grooves and can move therein. The positioning mechanism 64 acts between adjacent magnet steel sheets. When the magnet block bonding mechanism 63 works, it can abut against the magnet steel sheets, so that the magnet steel sheets are tightly attached to the rotor assembly. The positioning mechanism 64 can position the magnet steel sheets to prevent the magnet steel sheets from moving when the magnet block bonding mechanism 63 works, thereby affecting the normal magnet steel operation.

[0029] The bottom plate 61 further comprises a magnet steel height adjusting mechanism 65 arranged below the rotor assembly for installing the magnet steel sheets. The bottom plate 61 further comprises a product height adjusting mechanism 66 arranged below the rotor assembly.

[0030] The above technical solution only represents a preferred technical solution of the present application. Some changes made by those skilled in the art to some parts of the present application also represent the principles of the present application and are within the scope of the present application.

Claims

1. A device for synchronously attaching magnets to the surface of a rotor, characterized in that, It includes a magnet preparation mechanism (1), a magnet ejection mechanism (2) disposed on one side of the magnet preparation mechanism (1), a magnet loading mechanism (3) disposed on one side of the magnet preparation mechanism (1), a Y-axis moving mechanism (4) disposed below the magnet loading mechanism (3), a magnet clamping mechanism (5) disposed on one side of the magnet loading mechanism (3), and a magnet attaching mechanism (6) disposed on one side of the magnet clamping mechanism (5). The Y-axis moving mechanism (4) is connected to the magnet loading mechanism (3) and is disposed parallel to the magnet preparation mechanism (1). The magnet feeding mechanism (3) includes a rotating mechanism (31), a connecting mechanism (32) connected to the rotating mechanism (31), a magnet sheet storage mechanism (33) disposed on the connecting mechanism (32), a control mechanism (34) connected to the magnet sheet storage mechanism (33), and a push-out mechanism (35) disposed below the magnet sheet storage mechanism (33). The rotating mechanism (31) is mounted on the Y-axis moving mechanism (4), the connecting mechanism (32) is fixedly connected to the rotating mechanism (31), the control mechanism (34) is fixedly mounted on the connecting mechanism (32), and the push-out mechanism (35) is connected to the magnet sheet storage mechanism (33). The magnetic steel sheet storage mechanism (33) has a positioning post (331) at its center. The positioning post (331) is configured to cooperate with the positioning hole so that the positioning post (331) can be installed in the positioning hole. The control mechanism (34) is connected to the magnetic steel sheet storage mechanism (33) by a belt and can control the rotation of the magnetic steel sheet storage mechanism (33). The magnetic steel sheet storage mechanism (33) has a plurality of magnetic steel sheet storage holes (332) arranged in an array. The push mechanism (35) includes a first control cylinder (351) and a plurality of push plates (352) connected to the first control cylinder (351). The push plates (352) are arranged below the magnetic steel sheet storage holes (332) and can move up and down in the magnetic steel sheet storage holes (332). The magnet-attaching mechanism (6) includes a base plate (61), a positioning block (62) located at the center of the base plate (61), a magnet-attaching mechanism (63) located on the base plate (61) and circumferentially around the positioning block (62), and a positioning mechanism (64) located on the base plate (61) and circumferentially around the positioning block (62). The rotor assembly is installed inside the positioning block (62). The magnet-attaching mechanism (63) includes a fourth control cylinder (631), a first cylinder connecting block (632) engaged with the fourth control cylinder (631), an outer turntable (633) connected to the first cylinder connecting block (632), and several magnet-pressing mechanisms (634) located on the outer turntable (633). The outer turntable (633) is provided with several magnet-attaching mechanisms. The first waist-shaped groove is arranged in an array. The magnet pressing mechanism (634) is connected to the outer turntable (633) through the first waist-shaped groove. The number of magnet pressing mechanisms (634) is the same as the number of magnet sheets. The positioning mechanism (64) includes a fifth control cylinder (641), a second cylinder connecting block (642) connected to the fifth control cylinder (641), an inner turntable (643) engaged with the second cylinder connecting block (642), and a positioning block mechanism (644) connected to the inner turntable (643). The inner turntable (643) is provided with a plurality of second waist-shaped grooves arranged in an array. The positioning block mechanism (644) is installed in the second waist-shaped groove and can move within it. The positioning mechanism (64) acts between adjacent magnet sheets.

2. The rotor surface synchronous magnet bonding equipment according to claim 1, characterized in that, The magnet preparation mechanism (1) is provided with a position adjustment mechanism (7) below it. The magnet preparation mechanism (1) is connected to the position adjustment mechanism (7). The Y-axis moving mechanism (4) is arranged in parallel with the position adjustment mechanism (7). The position adjustment mechanism (7) has a vertical plate (8) on one side. The vertical plate has a positioning hole for positioning the magnet feeding mechanism (3). The magnet ejection mechanism (2) is arranged perpendicular to the position adjustment mechanism.

3. The rotor surface synchronous magnet bonding equipment according to claim 1, characterized in that, The rotating mechanism (31) includes a gear and rack module, which is connected to the connecting mechanism (32).

4. The rotor surface synchronous magnet bonding equipment according to claim 1, characterized in that, The magnetic steel clamping mechanism (5) includes an X-axis moving mechanism (51), a Z-axis moving mechanism (52) connected to the X-axis moving mechanism (51), a magnetic steel sheet fixing mechanism (53) connected to the Z-axis moving mechanism (52), and a magnetic steel sheet clamping mechanism (54) connected to the Z-axis moving mechanism (52). The magnetic steel sheet fixing mechanism (53) is located outside the magnetic steel sheet clamping mechanism (54).

5. The rotor surface synchronous magnet bonding equipment according to claim 4, characterized in that, The magnetic steel sheet clamping mechanism (54) includes a second control cylinder (541) and an insertion module (542) connected to the second control cylinder (541). The second control cylinder (541) is fixedly installed on the Z-axis moving mechanism (52), and the magnetic steel sheet fixing mechanism (53) is located outside the insertion module (542).

6. The rotor surface synchronous magnet bonding equipment according to claim 4, characterized in that, The magnetic steel sheet fixing mechanism (53) includes a third control cylinder (531), a gripper mechanism (532) connected to the third control cylinder (531), and a guide block (533) disposed inside the gripper mechanism (532). The guide block (533) is provided with a plurality of positioning grooves, one positioning groove corresponding to one magnetic steel sheet, and one positioning groove corresponding to one gripper mechanism (532).

7. The rotor surface synchronous magnet bonding equipment according to claim 6, characterized in that, The base plate (61) is also provided with a magnet height adjustment mechanism (65) located below the magnets mounted on the rotor assembly, and a product height adjustment mechanism (66) is also provided below the rotor assembly.

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