CN215746873U

CN215746873U - Movable tapping machine

Info

Publication number: CN215746873U
Application number: CN202122302508.5U
Authority: CN
Inventors: 薛勇; 赵顺奇
Original assignee: Luoyang Qixiang Machinery Technology Co ltd
Current assignee: Luoyang Qixiang Machinery Technology Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-02-08
Anticipated expiration: 2031-09-23

Abstract

The utility model discloses a movable tapping machine, four corners of the lower surface of a base plate are respectively provided with universal wheels, the rear end of the upper surface of the base plate is symmetrically provided with telescopic rods, the movable tapping machine can conveniently move through a connecting plate, a mounting hole and the universal wheels, a tapping machine body can move at different heights through a lifting unit, so as to meet the processing requirements of components with different heights, the tapping machine body can rotate at different angles through a rotating unit, so as to meet the processing requirements of components with different angles, the tapping machine body can move in a fixed state through an adjusting unit, so that the movable tapping machine can meet the working requirements of different occasions, and the position of a mould does not need to be repeatedly installed and adjusted when the mould of a special-shaped piece is tapped by the movable tapping machine, therefore, the working efficiency of the mobile tapping machine can be improved.

Description

Movable tapping machine

Technical Field

The utility model relates to the technical field of tapping machines, in particular to a movable tapping machine.

Background

The tapping machine is a machining device for machining internal threads, screws or tooth buttons on the inner side surfaces of holes of various parts with through holes or blind holes of different specifications, such as a part shell, an equipment end surface, a nut, a flange plate and the like. In the middle and low speed magnetic suspension track engineering, when the screw hole processing procedure of the aluminum induction plate of the F-shaped steel guide rail body is implemented, the conventional processing method comprises the following steps: the tapping machine is fixed, the component needing to be processed is placed on the movable bearing platform, the component is carried by the movable bearing platform to move, the component moves to the tapping machine, and the tapping machine is used for punching. However, when the member to be processed is a heavy-duty long member, no proper movable carrying platform is usually available for moving the member in the processing process, so that the processing of the heavy-duty long member is greatly limited

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, the utility model discloses a movable tapping machine which adopts the technical scheme that the movable tapping machine comprises a bottom plate, universal wheels are arranged at four corners of the lower surface of the bottom plate, telescopic rods are symmetrically arranged at the rear end of the upper surface of the bottom plate, an adjusting rod is arranged at the right side of the front end of the upper surface of the bottom plate, a sliding rod is arranged at the left side of the front end of the upper surface of the bottom plate, a top plate is arranged on the upper surface of the sliding rod, the right end of the lower surface of the top plate is rotatably connected with the upper surface of the adjusting rod, a lifting motor is arranged at the right end of the upper surface of the top plate, an output shaft of the lifting motor penetrates through the lower surface of the top plate and is fixedly connected with the upper surface of the adjusting rod, an adjusting block is arranged on the outer side surface of the adjusting rod, a screw hole in the upper surface of the adjusting block is matched with the outer side surface of the adjusting rod in a threaded manner, and the through hole in the upper surface of the adjusting block is matched with the outer side surface of the sliding rod in a manner, the rear side face of the adjusting block is provided with an adjusting plate, the lower surface of the adjusting plate is fixedly connected with the telescopic end of the telescopic rod, the rear end of the upper surface of the adjusting plate is symmetrically provided with limit blocks, the inner side face of each limit block is symmetrically provided with a rotating groove, the front end of the middle part of the upper surface of the adjusting plate is provided with a transmission shaft, the top end of the transmission shaft is fixedly connected with a power gear, the front end of the middle part of the lower surface of the adjusting plate is provided with a rotating motor, an output shaft of the rotating motor penetrates through the upper surface of the adjusting plate to be fixedly connected with the bottom end of the transmission shaft, the rear end of the middle part of the upper surface of the adjusting plate is provided with a rotating shaft, the bottom end of the rotating shaft is rotatably connected with the upper surface of the adjusting plate, the outer teeth of the transmission gear are matched and meshed with the outer teeth of the power gear, and the upper surface of the transmission gear is fixedly connected with a mounting plate, the mounting panel is the circular slab, the lateral surface of mounting panel rotates with the inner chamber side of swivelling chute to be connected, the lower surface of mounting panel and the inner chamber lower surface cooperation slidable mounting of swivelling chute, the upper surface front end of mounting panel is equipped with the regulating unit, the upper surface of regulating unit is equipped with the horizontal pole, the right-hand member fixedly connected with tapping machine body of horizontal pole, the adaptation hole has been seted up to the upper surface middle part front end of bottom plate, the position and the size in adaptation hole correspond with the position and the size of rotating electrical machines respectively, the upper surface middle part of roof is equipped with the singlechip, external power source's output is connected to the input electricity of singlechip, the output of singlechip is connected with the input electricity that promotes motor, rotating electrical machines and tapping machine body.

As a preferred technical scheme of the utility model, the adjusting unit comprises a fixed plate, an electric push rod, a sliding block, a fixed rod and a sliding groove, the fixed plate is arranged at the front end of the upper surface of the mounting plate, the sliding groove is formed in the middle of the upper surface of the mounting plate, the fixed end of the electric push rod is fixedly connected with the rear side face of the fixed plate, the telescopic end of the electric push rod is fixedly connected with the front side face of the sliding block, the sliding block and the sliding groove are matched and slidably mounted, the fixed rod is arranged on the upper surface of the sliding block, the top end of the fixed rod is fixedly connected with the lower end of the outer side face of the cross rod, the input end of the electric push rod is electrically connected with the output end of the single chip microcomputer, and the tapping machine body can be subjected to position adjustment through the adjusting unit.

As a preferable technical scheme, the supporting device further comprises a supporting plate, the supporting plate is arranged at the rear end of the upper surface of the mounting plate, the upper surface of the supporting plate is matched with the outer side surface of the cross rod in a sliding mode, and the cross rod can be supported in an auxiliary mode through the supporting plate.

As a preferable technical scheme, the installation structure further comprises a buffer cushion, the buffer cushion is arranged on the lower surface of the inner cavity of the rotary groove, the buffer cushion is an arc-shaped rubber cushion, the upper surface of the buffer cushion and the lower surface of the installation plate are matched and slidably installed, the lower surface of the installation plate and the lower surface of the inner cavity of the rotary groove can be protected through the buffer cushion, and therefore the abrasion effect of the installation plate and the rotary groove is reduced.

As a preferred technical scheme of the utility model, the mobile tapping machine further comprises a display, the display is arranged at the left end of the upper surface of the top plate, the input end of the display is electrically connected with the output end of the single chip microcomputer, and the working state and the working progress of the mobile tapping machine can be displayed in real time through the display.

The movable tapping machine further comprises a connecting plate, the connecting plate is arranged on the front side face of the bottom plate, the rear end of the upper surface of the connecting plate is fixedly connected with the front side face of the top plate, and the movable tapping machine can be conveniently connected with traction equipment through the connecting plate.

As a preferable technical scheme of the utility model, the traction device further comprises mounting holes, wherein the mounting holes are uniformly formed in the front side surface of the connecting plate, and the connecting plate and the traction device can be more stably connected through the mounting holes.

The utility model has the beneficial effects that: the movable tapping machine can conveniently move positions through the connecting plate, the mounting holes and the universal wheels, the tapping machine body can move at different heights through the lifting unit, the processing requirements of components with different heights are further met, the tapping machine body can rotate at different angles through the rotating unit, the processing requirements of components with different angles are further met, the tapping machine body can move in a fixed position state of the movable tapping machine through the adjusting unit, therefore, the movable tapping machine can meet the working requirements of different occasions, when a mould of a special-shaped piece is tapped, the position of the mould does not need to be repeatedly installed and adjusted, and therefore the working efficiency of the movable tapping machine can be improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a right side view of the present invention;

FIG. 3 is a schematic diagram of the right cross-sectional structure of the present invention;

FIG. 4 is a schematic diagram of a rear cross-sectional structure of the present invention.

In the figure: 1 bottom plate, 2 single-chip microcomputers, 3 universal wheels, 4 lifting units, 41 lifting motors, 42 top plates, 43 adjusting rods, 44 adjusting blocks, 45 sliding rods, 5 adapting holes, 6 adjusting plates, 7 telescopic rods, 8 rotating units, 81 rotating motors, 82 transmission shafts, 83 power gears, 84 transmission gears, 85 rotating shafts, 86 mounting plates, 9 adjusting units, 91 fixing plates, 92 electric push rods, 93 sliding blocks, 94 fixing rods, 95 sliding grooves, 10 transverse rods, 11 tapping machine bodies, 12 supporting plates, 13 limiting blocks, 14 rotating grooves, 15 cushion pads, 16 displays, 17 connecting plates and 18 mounting holes.

Detailed Description

Example 1

As shown in fig. 1 to 4, the utility model discloses a mobile tapping machine, which adopts the technical scheme that the mobile tapping machine comprises a bottom plate 1, universal wheels 3 are arranged at four corners of the lower surface of the bottom plate 1, telescopic rods 7 are symmetrically arranged at the rear end of the upper surface of the bottom plate 1, an adjusting rod 43 is arranged at the right side of the front end of the upper surface of the bottom plate 1, a sliding rod 45 is arranged at the left side of the front end of the upper surface of the bottom plate 1, a top plate 42 is arranged on the upper surface of the sliding rod 45, the right end of the lower surface of the top plate 42 is rotatably connected with the upper surface of the adjusting rod 43, a lifting motor 41 is arranged at the right end of the upper surface of the top plate 42, an output shaft of the lifting motor 41 penetrates through the lower surface of the top plate 42 to be fixedly connected with the upper surface of the adjusting rod 43, an adjusting block 44 is arranged on the outer side surface of the adjusting rod 43, a screw hole on the upper surface of the adjusting block 44 is matched with the outer side surface of the adjusting rod 43 in threaded mounting manner, an adjusting plate 6 is arranged on the rear side face of the adjusting block 44, the lower surface of the adjusting plate 6 is fixedly connected with the telescopic end of the telescopic rod 7, the rear end of the upper surface of the adjusting plate 6 is symmetrically provided with limiting blocks 13, the inner side faces of the limiting blocks 13 are symmetrically provided with rotating grooves 14, the front end of the middle part of the upper surface of the adjusting plate 6 is provided with a transmission shaft 82, the top end of the transmission shaft 82 is fixedly connected with a power gear 83, the front end of the middle part of the lower surface of the adjusting plate 6 is provided with a rotating motor 81, the output shaft of the rotating motor 81 penetrates through the upper surface of the adjusting plate 6 to be fixedly connected with the bottom end of the transmission shaft 82, the rear end of the middle part of the upper surface of the adjusting plate 6 is provided with a rotating shaft 85, the top end of the rotating shaft 85 is fixedly connected with a transmission gear 84, the outer teeth of the transmission gear 84 are matched and meshed with the outer teeth of the power gear 83, and the upper surface of the transmission gear 84 is fixedly connected with a mounting plate 86, the mounting plate 86 is a circular plate, the outer side surface of the mounting plate 86 is rotatably connected with the side surface of the inner cavity of the rotary groove 14, the lower surface of the mounting plate 86 is matched with the lower surface of the inner cavity of the rotary groove 14 to be slidably mounted, the adjusting unit 9 is arranged at the front end of the upper surface of the mounting plate 86, the cross rod 10 is arranged on the upper surface of the adjusting unit 9, the tapping machine body 11 is fixedly connected to the right end of the cross rod 10, the front end of the middle part of the upper surface of the bottom plate 1 is provided with an adapting hole 5, the position and the size of the adapting hole 5 respectively correspond to the position and the size of the rotary motor 81, the middle part of the upper surface of the top plate 42 is provided with the singlechip 2, the input end of the singlechip 2 is electrically connected with the output end of an external power supply, the output end of the singlechip 2 is electrically connected with the input ends of the lifting motor 41, the rotary motor 81 and the tapping machine body 11, the mobile tapping machine is moved to a working position through the universal wheel 3, and then the lifting motor 41 works through the singlechip 2, the lifting motor 41 drives the adjusting rod 43 fixedly connected with the output shaft of the lifting motor to rotate and adjust on the upper surface of the bottom plate 1, the adjusting rod 43 drives the adjusting block 44 with the outer side surface matched with the thread to perform thread transmission on the outer side surface of the adjusting rod 43, meanwhile, the adjusting block 44 performs sliding adjustment on the outer side surface of the sliding rod 45 through a through hole on the upper surface of the adjusting block, so that the adjusting block 44 drives the adjusting plate 6 fixedly connected with the rear side surface of the adjusting block to perform height adjustment, the tapping machine body 11 is moved to a proper working height to perform operation, the rotating motor 81 is operated through the single chip microcomputer 2, the rotating motor 81 drives the transmission shaft 82 fixedly connected with the output shaft of the rotating motor to rotate, the transmission shaft 82 drives the power gear 83 fixedly connected with the upper surface of the transmission shaft to rotate, and the power gear 83 drives the transmission gear 84 with the outer teeth matched and meshed with the external teeth to perform rotation adjustment, therefore, the transmission gear 84 drives the mounting plate 86 fixedly connected to the upper surface of the tapping machine body to rotate, the tapping machine body 11 can be moved to a proper working angle to perform operation, the adjusting unit 9 is made to work through the single chip microcomputer 2, the adjusting unit 9 drives the cross rod 10 fixedly connected to the upper surface of the tapping machine body to perform position adjustment, the cross rod 10 drives the tapping machine body 11 fixedly connected to the rear side surface of the cross rod to perform position adjustment, the tapping machine body 11 can be moved to a proper working position to perform operation, and accordingly the moving operation of the mobile tapping machine is completed.

As a preferred technical scheme of the utility model, the adjusting unit 9 comprises a fixed plate 91, an electric push rod 92, a sliding block 93, a fixed rod 94 and a sliding groove 95, the fixed plate 91 is arranged at the front end of the upper surface of the mounting plate 86, the sliding groove 95 is arranged in the middle of the upper surface of the mounting plate 86, the fixed end of the electric push rod 92 is fixedly connected with the rear side surface of the fixed plate 91, the telescopic end of the electric push rod 92 is fixedly connected with the front side surface of the sliding block 93, the sliding block 93 is matched and slidably mounted with the sliding groove 95, the fixed rod 94 is arranged on the upper surface of the sliding block 93, the top end of the fixed rod 94 is fixedly connected with the lower end of the outer side surface of the cross rod 10, the input end of the electric push rod 92 is electrically connected with the output end of the single chip microcomputer 2, the electric push rod 92 is operated by the single chip microcomputer 2, the electric push rod 92 drives the sliding block 93 fixedly connected with the telescopic end thereof to perform sliding adjustment in the sliding groove 95, and further the sliding block 93 drives the fixed rod 94 fixedly connected with the upper surface thereof to perform position adjustment, the cross bar 10 fixedly connected to the upper surface of the fixing rod 94 can thereby move the tapping machine body 11 for position adjustment.

As a preferred technical scheme of the utility model, the mobile tapping machine further comprises a support plate 12, wherein the support plate 12 is arranged at the rear end of the upper surface of the mounting plate 86, the upper surface of the support plate 12 is matched with the outer side surface of the cross rod 10 for sliding mounting, and the cross rod 10 can be supported in an auxiliary manner through the support plate 12, so that the operation of the mobile tapping machine body in the mobile tapping machine is more stable.

As a preferred technical scheme of the utility model, the mobile tapping machine further comprises a cushion pad 15, the cushion pad 15 is arranged on the lower surface of the inner cavity of the rotary groove 14, the cushion pad 15 is an arc-shaped rubber pad, the upper surface of the cushion pad 15 is matched and slidably mounted with the lower surface of the mounting plate 86, the lower surface of the mounting plate 86 and the lower surface of the inner cavity of the rotary groove 14 can be protected through the cushion pad 15, so that the abrasion effect of the mounting plate 86 and the rotary groove 14 is reduced, and the service life of the mobile tapping machine can be prolonged.

As a preferred technical scheme of the present invention, the mobile tapping machine further comprises a display 16, the display 16 is arranged at the left end of the upper surface of the top plate 42, the input end of the display 16 is electrically connected with the output end of the single chip microcomputer 2, and the display 16 can show the working state and the working progress of the mobile tapping machine in real time, so that a worker can visually observe the working state and the working progress of the mobile tapping machine.

As a preferred technical scheme of the utility model, the mobile tapping machine further comprises a connecting plate 17, the connecting plate 17 is arranged on the front side surface of the bottom plate 1, the rear end of the upper surface of the connecting plate 17 is fixedly connected with the front side surface of the top plate 42, and the mobile tapping machine can be conveniently connected with traction equipment through the connecting plate 17, so that the mobile tapping machine is more convenient to move.

As a preferable technical scheme of the present invention, the mobile tapping machine further comprises mounting holes 18, the mounting holes 18 are uniformly formed in the front side surface of the connecting plate 17, and the connection between the connecting plate 17 and the traction device can be more stable through the mounting holes 18, so that the mobile tapping machine can more stably move.

The working principle of the utility model is as follows: the mobile tapping machine is connected with traction equipment through a connecting plate 17 and a mounting hole 18, then the traction equipment moves the mobile tapping machine to a working position through a universal wheel 3, then a lifting motor 41 works through a single chip microcomputer 2, the lifting motor 41 drives an adjusting rod 43 fixedly connected with an output shaft of the lifting motor to rotate and adjust on the upper surface of a bottom plate 1, further the adjusting rod 43 drives an adjusting block 44 of which the outer side surface is matched with thread installation to perform thread transmission on the outer side surface of the adjusting rod 43, meanwhile, the adjusting block 44 performs sliding adjustment on the outer side surface of a sliding rod 45 through a through hole on the upper surface of the adjusting block, so that the adjusting block 44 drives an adjusting plate 6 fixedly connected with the rear side surface of the adjusting block to perform height adjustment, further, a tapping machine body 11 is moved to a proper working height to perform operation, the rotating motor 81 works through a connecting plate 2, and the single chip microcomputer 81 drives a transmission shaft 82 fixedly connected with the output shaft of the single chip microcomputer to rotate, and then make the transmission shaft 82 drive its upper surface fixedly connected power gear 83 rotate, thus make power gear 83 drive its external tooth cooperation meshing mounted drive gear 84 to rotate and adjust, thus make drive gear 84 drive its upper surface fixedly connected mounting panel 86 to rotate, can make the tapping machine body 11 move to suitable operating angle and carry on the operation from this, make the regulating unit 9 work through the one-chip computer 2, make the regulating unit 9 drive its upper surface fixedly connected horizontal pole 10 to carry on the position control, and then make the horizontal pole 10 drive its rear side fixedly connected tapping machine body 11 to carry on the position control, can make the tapping machine body 11 move to suitable operating position and carry on the operation from this, thus finish the removal operation of this portable tapping machine.

The circuit connection related to the utility model is a conventional means adopted by technicians in the field, can obtain technical inspiration through limited tests, belongs to the widely used prior art, and the single chip microcomputer 2 can select the model DZC-9011 of Di Marge machinery Co., Ltd, Dongguan, the lifting motor 41 and the rotating motor 81 can select the model SQN30.111A3500 of Shanghai Ming Dynasty heat energy equipment Co., Ltd, the electric push rod 92 can select the model HD of Suzhou high control technology Co., Ltd, and the display 16 can select the model SIEBERT of Shanghai Xipesh electromechanical equipment Co., Ltd.

Components not described in detail herein are prior art.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims

1. The movable tapping machine is characterized by comprising a bottom plate (1), universal wheels (3) are arranged at four corners of the lower surface of the bottom plate (1), telescopic rods (7) are symmetrically arranged at the rear end of the upper surface of the bottom plate (1), an adjusting rod (43) is arranged on the right side of the front end of the upper surface of the bottom plate (1), a sliding rod (45) is arranged on the left side of the front end of the upper surface of the bottom plate (1), a top plate (42) is arranged on the upper surface of the sliding rod (45), the right end of the lower surface of the top plate (42) is rotatably connected with the upper surface of the adjusting rod (43), a lifting motor (41) is arranged at the right end of the upper surface of the top plate (42), an output shaft of the lifting motor (41) penetrates through the lower surface of the top plate (42) and is fixedly connected with the upper surface of the adjusting rod (43), an adjusting block (44) is arranged on the outer side surface of the adjusting rod (43), a screw hole in threaded mounting with the outer side surface of the adjusting rod (43), the through hole of the upper surface of the adjusting block (44) is in sliding installation with the outer side surface of the sliding rod (45) in a matched mode, the rear side surface of the adjusting block (44) is provided with an adjusting plate (6), the lower surface of the adjusting plate (6) is fixedly connected with the telescopic end of the telescopic rod (7), the rear end of the upper surface of the adjusting plate (6) is symmetrically provided with a limiting block (13), the inner side surface of the limiting block (13) is symmetrically provided with a rotating groove (14), the front end of the middle of the upper surface of the adjusting plate (6) is provided with a transmission shaft (82), the top end of the transmission shaft (82) is fixedly connected with a power gear (83), the front end of the middle of the lower surface of the adjusting plate (6) is provided with a rotating motor (81), the output shaft of the rotating motor (81) penetrates through the upper surface of the adjusting plate (6) and the bottom end of the transmission shaft (82) in a fixed mode, and the rear end of the middle of the upper surface of the adjusting plate (6) is provided with a rotating shaft (85), the bottom of pivot (85) is connected with the upper surface rotation of regulating plate (6), the top fixedly connected with drive gear (84) of pivot (85), the external tooth of drive gear (84) and the external tooth cooperation meshing installation of power gear (83), the last fixed surface of drive gear (84) is connected with mounting panel (86), mounting panel (86) are the circular slab, the lateral surface of mounting panel (86) rotates with the inner chamber side of swivelling chute (14) to be connected, the lower surface of mounting panel (86) and the inner chamber lower surface cooperation slidable mounting of swivelling chute (14), the upper surface front end of mounting panel (86) is equipped with adjusting unit (9), the upper surface of adjusting unit (9) is equipped with horizontal pole (10), the right-hand member fixedly connected with tapping machine body (11) of horizontal pole (10), adaptation hole (5) has been seted up to the upper surface middle part front end of bottom plate (1), the position and the size of the adapting hole (5) correspond to those of the rotating motor (81) respectively, the middle of the upper surface of the top plate (42) is provided with the single chip microcomputer (2), the input end of the single chip microcomputer (2) is electrically connected with the output end of an external power supply, and the output end of the single chip microcomputer (2) is electrically connected with the input ends of the lifting motor (41), the rotating motor (81) and the tapping machine body (11).

2. The mobile threading machine of claim 1 wherein: regulating unit (9) are including fixed plate (91), electric putter (92), sliding block (93), dead lever (94) and spout (95), the upper surface front end of mounting panel (86) is located to fixed plate (91), the upper surface middle part in mounting panel (86) is seted up in spout (95), the stiff end of electric putter (92) and the trailing flank fixed connection of fixed plate (91), the flexible end of electric putter (92) and the leading flank fixed connection of sliding block (93), sliding block (93) and spout (95) cooperation slidable mounting, the upper surface of sliding block (93) is located to dead lever (94), the top of dead lever (94) and the lateral surface lower extreme fixed connection of horizontal pole (10), the input of electric putter (92) is connected with the output electricity of singlechip (2).

3. The mobile threading machine of claim 1 wherein: the novel support device is characterized by further comprising a support plate (12), wherein the support plate (12) is arranged at the rear end of the upper surface of the mounting plate (86), and the upper surface of the support plate (12) is in sliding mounting with the outer side surface of the cross rod (10).

4. The mobile threading machine of claim 1 wherein: still include blotter (15), the inner chamber lower surface of rotatory groove (14) is located in blotter (15), blotter (15) are the arc rubber pad, the upper surface of blotter (15) and the lower surface cooperation slidable mounting of mounting panel (86).

5. The mobile threading machine of claim 1 wherein: the display device is characterized by further comprising a display (16), wherein the display (16) is arranged at the left end of the upper surface of the top plate (42), and the input end of the display (16) is electrically connected with the output end of the single chip microcomputer (2).

6. The mobile threading machine of claim 1 wherein: the connecting plate is characterized by further comprising a connecting plate (17), the connecting plate (17) is arranged on the front side face of the bottom plate (1), and the rear end of the upper surface of the connecting plate (17) is fixedly connected with the front side face of the top plate (42).

7. The mobile threading machine of claim 6 wherein: the connecting plate is characterized by further comprising mounting holes (18), wherein the mounting holes (18) are uniformly formed in the front side face of the connecting plate (17).