阅读说明：本技术 一种汽车控制臂胶套铆压安装设备 (Riveting and mounting equipment for rubber sleeve of automobile control arm ) 是由 王一伟 于 2021-08-20 设计创作，主要内容包括：本发明涉及一种胶套铆压安装设备,尤其涉及一种汽车控制臂胶套铆压安装设备。技术问题为：提供一种安全性较高且精准度较高的汽车控制臂胶套铆压安装设备。本发明提供了这样一种汽车控制臂胶套铆压安装设备,包括有支撑柜和工作台,工作台安装在支撑柜顶部；机架,机架安装在工作台顶部一侧；电动推杆,电动推杆安装在机架上部一侧；压块,压块安装在电动推杆的伸缩杆底部。本发明通过减速电机作为驱动力,能够带动放置盘进行转动,从而带动控制臂转动,在第一接触轮和接触架的配合下,能够带动定位杆往内侧运动将控制臂夹紧,然后通过电动推杆作为驱动力,能够带动压块往下运动,从而带动胶套往下运动安装到控制臂上,精准度较高。(The invention relates to rubber sleeve riveting and mounting equipment, in particular to automobile control arm rubber sleeve riveting and mounting equipment. The technical problem is as follows: the riveting and installing equipment for the automobile control arm rubber sleeve is high in safety and high in accuracy. The invention provides riveting and mounting equipment for a rubber sleeve of an automobile control arm, which comprises a supporting cabinet and a workbench, wherein the workbench is arranged at the top of the supporting cabinet; the rack is arranged on one side of the top of the workbench; the electric push rod is arranged on one side of the upper part of the frame; the briquetting, the briquetting is installed in electric putter's telescopic link bottom. According to the invention, the placing disc can be driven to rotate by taking the speed reducing motor as a driving force, so that the control arm is driven to rotate, the positioning rod can be driven to move inwards to clamp the control arm under the matching of the first contact wheel and the contact frame, then the pressing block can be driven to move downwards by taking the electric push rod as a driving force, so that the rubber sleeve is driven to move downwards to be installed on the control arm, and the accuracy is higher.)

1. The utility model provides an automobile control arm gum cover riveting erection equipment which characterized in that, including:

the device comprises a supporting cabinet (1) and a workbench (2), wherein the workbench (2) is arranged at the top of the supporting cabinet (1);

the rack (3), the rack (3) is installed on one side of the top of the workbench (2);

the electric push rod (4), the electric push rod (4) is installed on one side of the upper part of the frame (3);

the pressing block (5), the pressing block (5) is installed at the bottom of the telescopic rod of the electric push rod (4);

a rotating assembly (6), wherein the rotating assembly (6) is arranged on the upper middle side of the workbench (2);

the movable assembly (7), the movable assembly (7) is installed on the rotating assembly (6);

locating component (8), locating component (8) are installed on runner assembly (6), and locating component (8) are located movable assembly (7) outside.

2. The automobile control arm rubber sleeve riveting and installing device according to claim 1, wherein the rotating assembly (6) comprises:

a placing disc (601), wherein the placing disc (601) is rotatably arranged at the upper middle side of the workbench (2);

a gear ring (602), wherein the gear ring (602) is installed on the middle side of the lower part of the placing disc (601);

a speed reducing motor (603), wherein the speed reducing motor (603) is arranged at the middle side of the bottom of the workbench (2);

and the gear (604), the gear (604) is arranged on an output shaft of the speed reducing motor (603), and the gear (604) is meshed with the gear ring (602).

3. The riveting and press mounting device for the rubber sleeve of the automobile control arm according to claim 2, wherein the movable assembly (7) comprises:

the movable blocks (701), the movable blocks (701) are installed on the placing disc (601) in a sliding mode at uniform intervals;

the positioning rods (702), the positioning rods (702) are symmetrically arranged at the top of the movable block (701), and the positioning rods (702) are all connected with the placing disc (601) in a sliding manner;

the fixed rods (703) are symmetrically arranged at the bottoms of the three movable blocks (701);

the loop bars (704) are symmetrically arranged at the bottoms of the other three movable blocks (701), and the fixed rods (703) slide in the adjacent loop bars (704);

and a first spring (705), wherein the first spring (705) is arranged between the fixing rod (703) and the adjacent sleeve rod (704).

4. The automobile control arm rubber sleeve riveting and installing device according to claim 3, wherein the positioning component (8) comprises:

the supporting plate (801), the supporting plate (801) is installed on one side of the bottom of the workbench (2);

a first contact wheel (802), the first contact wheel (802) is installed on the middle side of the top of the support plate (801);

the contact frames (803) are uniformly and alternately arranged at the bottom of the placing disc (601) in a sliding manner, and the contact frames (803) are matched with the first contact wheels (802);

and the second spring (804), the second spring (804) is symmetrically arranged between the outer side of the contact frame (803) and the placing disc (601).

5. The automobile control arm rubber sleeve riveting and installing equipment according to claim 4, characterized by further comprising an auxiliary component (9), wherein the auxiliary component (9) comprises:

the guide frame (901), the guide frame (901) is installed on the middle side of the top of the placing tray (601);

the sliding rods (902), the sliding rods (902) are installed on the upper part of the guide frame (901) in a sliding manner at uniform intervals;

the clamping rods (903), the clamping rods (903) are symmetrically and slidably mounted on the sliding rod (902);

and the third spring (904), and the third spring (904) is installed between two adjacent clamping rods (903).

6. The automobile control arm rubber sleeve riveting and installing device according to claim 5, characterized by further comprising an opening component (10), wherein the opening component (10) comprises:

the second contact wheel (1001), the second contact wheel (1001) is installed on the top of the first contact wheel (802), and the second contact wheel (1001) penetrates through the placing disc (601);

the rotating rod (1002), the rotating rod (1002) is rotatably arranged on the inner side of the clamping rod (903);

the bolt (1003) is rotatably arranged between the inner sides of the two adjacent rotating rods (1002);

and the roller (1004) is rotatably arranged on the upper part of the bolt (1003), and the roller (1004) is matched with the second contact wheel (1001).

7. The automobile control arm rubber sleeve riveting and installing device according to claim 6, characterized by further comprising a lifting assembly (11), wherein the lifting assembly (11) comprises:

the contact ring (1101), the contact ring (1101) is installed in the middle of the second contact wheel (1001);

the contact rod (1102), the contact rod (1102) is installed at the lower part of the inner side of the sliding rod (902), and the contact rod (1102) is matched with the contact ring (1101);

and the fourth spring (1103), and the fourth spring (1103) is installed between the bottom of the contact rod (1102) and the placing disc (601).

8. The automobile control arm rubber sleeve riveting and installing equipment according to claim 7, characterized by further comprising a distribution box (201) and a button (202), wherein the distribution box (201) is arranged on one side of the top of the workbench (2), the button (202) is installed on the middle side of the top of the distribution box (201), a switching power supply, a control module and a power supply module are arranged in the distribution box (201), the switching power supply supplies power to the whole installing equipment, the power supply module is connected with a power supply main switch through a circuit, the control module is electrically connected with the power supply module, the control module is connected with a DS1302 clock circuit and a 24C02 circuit, the button (202) is electrically connected with the control module, and the electric push rod (4) and the speed reducing motor (603) are connected with the control module through peripheral circuits.

Technical Field

The invention relates to rubber sleeve riveting and mounting equipment, in particular to automobile control arm rubber sleeve riveting and mounting equipment.

Background

The automobile control arm is a guiding and force transferring element of an automobile suspension system, can transfer various forces acting on wheels to an automobile body, can ensure that the wheels move according to a certain track, and is usually provided with a rubber sleeve which can play a role in buffering.

To the installation of gum cover, it is artifical to fix the control arm usually, then on putting the round hole of control arm with the gum cover, instrument such as pneumatic cylinder of recycling is down the punching press with the gum cover, thereby accomplish the installation operation of gum cover, in the punching press in-process, people's hand is easily by the accidental injury, the security is not high, and during the position of artifical fixed control arm and gum cover, can be because the precision is not high, lead to the position to have the deviation and cause the punching press failure, consequently, the higher and higher car control arm gum cover riveting erection equipment of precision of security has been designed.

Disclosure of Invention

In order to overcome artifical when the installation gum cover, the hand is injured by the mistake easily, and the security is not high, can lead to the position to have the deviation moreover because the precision is not high and cause the shortcoming of punching press failure, the technical problem is: the riveting and installing equipment for the automobile control arm rubber sleeve is high in safety and high in accuracy.

The technical scheme is as follows: the utility model provides an automobile control arm gum cover riveting erection equipment, including:

the device comprises a supporting cabinet and a workbench, wherein the workbench is arranged at the top of the supporting cabinet;

the rack is arranged on one side of the top of the workbench;

the electric push rod is arranged on one side of the upper part of the frame;

the pressing block is arranged at the bottom of the telescopic rod of the electric push rod;

the rotating assembly is arranged on the middle side of the upper part of the workbench;

the movable assembly is arranged on the rotating assembly;

and the positioning assembly is arranged on the rotating assembly and is positioned outside the movable assembly.

Further, the rotating assembly comprises:

the placing disc is rotatably arranged on the upper middle side of the workbench;

the gear ring is arranged on the middle side of the lower part of the placing disc;

the speed reducing motor is arranged on the middle side of the bottom of the workbench;

and the gear is arranged on an output shaft of the speed reducing motor and is meshed with the gear ring.

Further, the movable assembly comprises:

the movable blocks are arranged on the placing disc in a sliding manner at uniform intervals;

the positioning rods are symmetrically arranged at the tops of the movable blocks and are connected with the placing disc in a sliding manner;

the fixed rods are symmetrically arranged at the bottoms of the three movable blocks;

the sleeve rods are symmetrically arranged at the bottoms of the other three movable blocks, and the fixed rods slide in the adjacent sleeve rods;

and the first spring is arranged between the fixed rod and the adjacent loop rod.

Further, the locating component comprises:

the supporting plate is arranged on one side of the bottom of the workbench;

a first contact wheel installed at an upper inner side of the supporting plate;

the contact frames are uniformly and alternately arranged at the bottom of the placing disc in a sliding manner and are matched with the first contact wheels;

and the second springs are symmetrically arranged between the outer side of the contact frame and the placing plate.

Further, still including supplementary subassembly, supplementary subassembly includes:

the guide frame is arranged on the middle side of the top of the placing disc;

the sliding rods are arranged on the upper part of the guide frame in a sliding manner at uniform intervals;

the clamping rods are symmetrically and slidably arranged on the sliding rod;

and the third spring is arranged between two adjacent clamping rods.

Further, still including opening the subassembly, open the subassembly including:

the second contact wheel is arranged at the top of the first contact wheel and penetrates through the placing disc;

the rotating rod is rotatably arranged on the inner side of the clamping rod;

the bolt is rotatably arranged between the inner sides of the two adjacent rotating rods;

the roller is rotatably arranged on the upper part of the bolt and is matched with the second contact wheel.

Further, still including the lifting subassembly, the lifting subassembly is including:

the contact ring is arranged in the middle of the second contact wheel;

the contact rod is arranged at the lower part of the inner side of the sliding rod and is matched with the contact ring;

and the fourth spring is arranged between the bottom of the contact rod and the placing disc.

Further, still including block terminal and button, workstation top one side is equipped with the block terminal, the block terminal mid-side is installed at the button, including switching power supply in the block terminal, control module and power module, switching power supply is the power supply of whole erection equipment, there is the power master switch through the line connection on the power module, control module and power module pass through electric connection, last DS1302 clock circuit and the 24C02 circuit of being connected with of control module, the button passes through electric connection with control module, electric putter and gear motor all pass through peripheral circuit with control module and are connected.

The invention has the following advantages: 1. according to the invention, the placing disc can be driven to rotate by taking the speed reducing motor as a driving force, so that the control arm is driven to rotate, the positioning rod can be driven to move inwards to clamp the control arm under the matching of the first contact wheel and the contact frame, then the pressing block can be driven to move downwards by taking the electric push rod as a driving force, so that the rubber sleeve is driven to move downwards to be installed on the control arm, and the accuracy is higher.

2. When placing the dish and rotating, can drive the gyro wheel and roll in the second contact wheel outside, when the contact of the protruding position of gyro wheel and second contact wheel, can drive the clamping bar and move toward the outside, then the manual work is put the gum cover between the clamping bar, when the protruding position separation of gyro wheel and second contact wheel, the clamping bar can be tight with the gum cover clamp toward the inboard motion, so can avoid people to be hindered by the briquetting mistake, and the security is higher.

3. According to the invention, through the matching of the contact rod and the contact ring, the contact rod and the sliding rod can be driven to move upwards after the control arm is provided with the rubber sleeve, so that people can take out the control arm provided with the rubber sleeve conveniently.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a partial perspective view of the present invention.

Fig. 3 is a schematic diagram of the burst structure of the present invention.

Fig. 4 is a schematic perspective view of a first rotating assembly according to the present invention.

Fig. 5 is a schematic perspective view of a second rotating assembly of the present invention.

Fig. 6 is a schematic perspective view of a first movable assembly of the present invention.

Fig. 7 is a schematic perspective view of a second movable assembly of the present invention.

Fig. 8 is a schematic view of a third perspective structure of the movable assembly of the present invention.

Fig. 9 is a schematic perspective view of a first positioning assembly according to the present invention.

Fig. 10 is a schematic perspective view of a second positioning assembly of the present invention.

Fig. 11 is a third perspective view of the positioning assembly of the present invention.

Fig. 12 is a schematic perspective view of a first auxiliary assembly according to the present invention.

Fig. 13 is a second perspective view of the auxiliary assembly of the present invention.

Fig. 14 is a third perspective view of the auxiliary assembly of the present invention.

Figure 15 is a perspective view of the lift assembly of the present invention.

Fig. 16 is a circuit block diagram of the present invention.

Fig. 17 is a schematic circuit diagram of the present invention.

Part names and serial numbers in the figure: 1_ supporting cabinet, 2_ workbench, 201_ distribution box, 202_ button, 3_ frame, 4_ electric push rod, 5_ press block, 6_ rotating assembly, 601_ placing tray, 602_ ring gear, 603_ speed reducing motor, 604_ gear, 7_ movable assembly, 701_ movable block, 702_ positioning rod, 703_ fixed rod, 704_ loop bar, 705_ first spring, 8_ positioning assembly, 801_ supporting plate, 802_ first contact wheel, 803_ contact frame, 804_ second spring, 9_ auxiliary assembly, 901_ guide frame, 902_ slide bar, 903_ clamping bar, 904_ third spring, 10_ expanding assembly, 1001_ second contact wheel, 1002_ rotating bar, 1003_ bolt, 1004_ roller, 11_ lifting assembly, 1101_ contact ring, 1102_ contact bar, 1103_ fourth spring.

Detailed Description

The invention is further illustrated by the following specific examples in which, unless otherwise explicitly stated and limited, terms such as: the arrangement, installation, connection are to be understood broadly, for example, they may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The utility model provides an automobile control arm gum cover riveting erection equipment, as shown in fig. 1-11, including supporting cabinet 1, workstation 2, frame 3, electric putter 4, briquetting 5, runner assembly 6, movable assembly 7 and locating component 8, supporting cabinet 1 top is equipped with workstation 2, 2 top rear middle sides of workstation are equipped with frame 3, 3 upper portion front sides of frame are equipped with electric putter 4, electric putter 4's telescopic link bottom is equipped with briquetting 5, 2 upper middle sides of workstation are equipped with runner assembly 6, the last movable assembly 7 that is equipped with of runner assembly 6, the last locating component 8 that is equipped with of runner assembly 6, locating component 8 is located the 7 outsides of movable assembly.

The rotating assembly 6 comprises a placing disc 601, a gear ring 602, a speed reducing motor 603 and a gear 604, the placing disc 601 is rotatably arranged on the middle side of the upper part of the workbench 2, the gear ring 602 is arranged on the middle side of the lower part of the placing disc 601, the speed reducing motor 603 is arranged on the middle side of the bottom of the workbench 2, the gear 604 is arranged on the output shaft of the speed reducing motor 603, and the gear 604 is meshed with the gear ring 602.

The movable assembly 7 comprises movable blocks 701, positioning rods 702, fixing rods 703, sleeve rods 704 and first springs 705, three groups of movable blocks 701 are arranged on the placing tray 601 in a sliding mode at even intervals, the number of each group is 2, the positioning rods 702 are symmetrically arranged at the tops of the movable blocks 701, the positioning rods 702 are connected with the placing tray 601 in a sliding mode, the fixing rods 703 are symmetrically arranged at the bottoms of the three movable blocks 701, the sleeve rods 704 are symmetrically arranged at the bottoms of the other three movable blocks 701, the fixing rods 703 slide inside the adjacent sleeve rods 704, and the first springs 705 are arranged between the fixing rods 703 and the adjacent sleeve rods 704.

The positioning assembly 8 comprises a supporting plate 801, a first contact wheel 802, a contact frame 803 and second springs 804, the supporting plate 801 is arranged on the front side of the bottom of the workbench 2, the first contact wheel 802 is arranged on the middle side of the top of the supporting plate 801, three contact frames 803 are arranged on the bottom of the placing disc 601 in a sliding mode at uniform intervals, the contact frames 803 are matched with the first contact wheel 802, and the two second springs 804 are arranged on the outer side of each contact frame 803 and between the placing discs 601.

When people need to use the installation equipment, firstly, a power supply main switch is manually pressed down to electrify the whole installation equipment, then a control arm is placed on the right side of the top of the placement tray 601 to be positioned between the four positioning rods 702 on the right side, then the button 202 is pressed once to send a signal, the control module receives the signal and then controls the speed reducing motor 603 to work for 2 seconds, the output shaft of the speed reducing motor 603 drives the gear 604 to rotate so as to drive the gear ring 602 and the placement tray 601 to rotate, the placement tray 601 drives the movable block 701, the positioning rods 702 and the contact frame 803 to rotate so as to drive the control arm to rotate clockwise, when the contact frame 803 is in contact with the convex part of the first contact wheel 802, the first contact wheel 802 extrudes the contact frame 803 to move outwards, the second spring 804 stretches, the contact frame 803 extrudes the movable block 701 to move inwards, so as to drive the positioning rods 702, the fixed rods 703 and the sleeve rods 704 to move inwards, the first spring 705 is compressed to enable the positioning rod 702 to clamp the control arm tightly, after 2 seconds, the control module controls the speed reducing motor 603 to stop working, the rotation is completely stopped, then the next control arm is manually placed on the right side of the top of the placing disc 601 to enable the next control arm to be located between the next group of four positioning rods 702, the control module controls the electric push rod 4 to extend for 2 seconds and then shorten for 2 seconds, the telescopic rod of the electric push rod 4 firstly drives the pressing block 5 to move downwards, after 2 seconds, the telescopic rod of the electric push rod 4 drives the pressing block 5 to move upwards and reset, after 2 seconds, the control module controls the electric push rod 4 to stop working, the control module controls the speed reducing motor 603 to work for 2 seconds, the reciprocating is carried out, when the control arm is located under the pressing block 5, the rubber sleeve is manually placed at a round hole on the control arm, at the moment, the pressing block 5 can move downwards to be in contact with the rubber sleeve, so as to drive the rubber sleeve to move downwards, so that the rubber sleeve is mounted on the control arm, and so on, when the contact frame 803 is separated from the convex portion of the first contact wheel 802, the second spring 804 restores to the original state to drive the contact frame 803 to move inwards for resetting, the contact frame 803 releases the movable block 701, the first spring 705 restores to the original state to drive the movable block 701, the positioning rod 702, the fixed rod 703 and the loop bar 704 to move outwards for resetting, so that the positioning rod 702 releases the control arm provided with the rubber sleeve, then the control arm with the rubber sleeve installed is taken out manually and then put into the next control arm, the device is operated repeatedly, after all the control arms are provided with the rubber sleeves, people press the button 202 once again, the button 202 sends out a signal, the control module controls the speed reducing motor 603 to stop working after receiving the signal, when people do not need to use the installation equipment, the power supply main switch is pressed down again, so that the whole installation equipment is powered off.

Example 2

On the basis of embodiment 1, as shown in fig. 12 to 15, the device further includes an auxiliary assembly 9, the auxiliary assembly 9 includes a guide frame 901, sliding rods 902, clamping rods 903 and third springs 904, the guide frame 901 is disposed on the top inner side of the placing tray 601, the three sliding rods 902 are disposed on the upper portion of the guide frame 901 in a sliding manner at uniform intervals, the clamping rods 903 are symmetrically disposed on the sliding rods 902 in a sliding manner, and the third springs 904 are disposed between two adjacent clamping rods 903.

Still including opening subassembly 10, opening subassembly 10 including second contact wheel 1001, bull stick 1002, bolt 1003 and gyro wheel 1004, first contact wheel 802 top is equipped with second contact wheel 1001, second contact wheel 1001 passes and places dish 601, the equal rotary type in clamping bar 903 inboard is equipped with bull stick 1002, equal rotary type is equipped with bolt 1003 between two adjacent bull sticks 1002 inboards, the equal rotary type in bolt 1003 upper portion is equipped with gyro wheel 1004, gyro wheel 1004 and the cooperation of second contact wheel 1001.

Still including lifting subassembly 11, lifting subassembly 11 is equipped with contact ring 1101 including contact ring 1101, contact bar 1102 and fourth spring 1103 in the middle part of second contact wheel 1001, and the inboard lower part of slide bar 902 all is equipped with contact bar 1102, and contact bar 1102 and the cooperation of contact ring 1101, contact bar 1102 bottom and place all be equipped with fourth spring 1103 between the dish 601.

Initially, the fourth spring 1103 on the right side is in a stretched state, when the placing tray 601 rotates, the guiding frame 901 is driven to rotate, so as to drive the sliding rod 902 to rotate, and further drive the clamping rod 903, the contact rod 1102, the rotating rod 1002, the latch 1003 and the roller 1004 to rotate, so that the roller 1004 rolls outside the second contact wheel 1001, when the contact rod 1102 on the right side is separated from the convex part of the contact ring 1101, the fourth spring 1103 on the right side returns to the original state, so as to drive the contact rod 1102 on the right side, the sliding rod 902 on the right side and the clamping rod 903 on the right side to move downwards, when the roller 1004 contacts with the convex part of the second contact wheel 1001, the roller 1004, the latch 1004, and the rotating rod 1002 can be extruded to move outwards, so as to drive the clamping rod 903 to move outwards, the third spring 904 stretches, when the placing tray 601 stops rotating, the above-mentioned rotations all stop, then the rubber sleeve is manually placed between the two clamping rods 903, so that the rubber sleeve is located at the round hole of the control arm, then the placing disc 601 continues to rotate to drive the sliding rod 902, the clamping rod 903, the contact rod 1102, the rotating rod 1002, the plug pin 1003 and the roller 1004 to rotate, so as to drive the rubber sleeve and the control arm to rotate backwards, when the roller 1004 is separated from the convex part of the second contact wheel 1001, the third spring 904 returns to the original state to drive the two clamping rods 903 to move inwards and reset, so as to clamp the rubber sleeve, at the moment, the placing disc 601 stops rotating, the rubber sleeve is positioned under the pressing block 5, the pressing block 5 can move downwards to press the rubber sleeve downwards to be arranged on the control arm, then the placing disc 601 continues to rotate to drive the sliding rod 902, the clamping rod 903, the contact rod 1102, the rotating rod 1002, the plug pin 1003 and the roller 1004 to rotate, when the contact rod 1102 on the right side is in contact with the convex part of the contact ring 1101, the contact rod 1102 on the right side is pressed to move upwards, the fourth spring 1103 on the right side is stretched, so as to drive the sliding rod 902 and the clamping rod 903 on the right side to move upwards, at this time, people can take out the control arm with the rubber sleeve installed.

As shown in fig. 1, fig. 3, fig. 16 and fig. 17, the power distribution box 201 and the button 202 are further included, the power distribution box 201 is arranged on the right front side of the top of the workbench 2, the button 202 is arranged on the middle side of the top of the power distribution box 201, a switching power supply is included in the power distribution box 201, the switching power supply supplies power to the whole installation device, a power main switch is connected to the power supply module through a circuit, the control module and the power supply module are electrically connected, a DS1302 clock circuit and a 24C02 circuit are connected to the control module, the button 202 is electrically connected to the control module, and the electric push rod 4 and the speed reduction motor 603 are both connected to the control module through peripheral circuits.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.