CN218177765U

CN218177765U - Installation mechanism convenient to installation axis of rotation

Info

Publication number: CN218177765U
Application number: CN202222372469.0U
Authority: CN
Inventors: 瞿亚男
Original assignee: Ningbo Beilun Zhongfu Machinery Co ltd
Current assignee: Ningbo Beilun Zhongfu Machinery Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2022-12-30
Anticipated expiration: 2032-09-06

Abstract

The utility model discloses an installation mechanism convenient to installation axis of rotation, including the axis of rotation main part, axis of rotation main part lower surface middle part correspondence is provided with the loading board, the adjusting collar rotates to be installed on the through-hole, adjusting part is corresponding with the locating plate position, the adjusting part both sides all are provided with the centre gripping subassembly, centre gripping subassembly and locating plate sliding connection, the utility model discloses possess and set up the design of supporting component through the loading board lower surface, when needs are installed to the axis of rotation main part, start driving motor earlier, driving motor can drive through the lead screw and support the cover and reciprocate, supports the cover and can drive the loading board and reciprocate, can drive auxiliary gear when rotating the cover and rotate, auxiliary gear rotates and can drive adjusting gear with the connecting rod and rotate, and adjusting gear can drive the grip block through the pinion rack and remove afterwards, can carry out the centre gripping to the place that needs the installation to reach the convenient advantage with the fixed effect of axis of rotation main part installation.

Description

Installation mechanism convenient to installation axis of rotation

Technical Field

The utility model belongs to the technical field of the axis of rotation, especially, relate to an installation mechanism convenient to installation axis of rotation.

Background

Rotation is a common type of motion. When the object rotates, each point of the object makes a circular motion, the centers of the circles are on the same straight line, and the straight line is called as a rotating shaft. The door, window, grinding wheel and rotor of motor are all equipped with fixed rotating shaft, and can only produce rotation, but can not make translation. Several forces act on the object, their rotational action on the object being determined by the algebraic sum of their moments. If the algebraic sum of the moments is equal to zero, the object will rotate at a constant speed or remain stationary at the original angular velocity. Publication No.: CN211809824U, a steering wheel axis of rotation is disclosed, including the steering wheel, axis of rotation and connecting axle, the steering wheel is located the upper end of axis of rotation, the connecting axle is located the lower extreme of axis of rotation, the middle part of steering wheel is provided with the air bag box, the both ends of air bag box are through a plurality of connecting rods and steering wheel looks fixed connection, the lower extreme of air bag box is provided with the connecting piece that is connected with the top of axis of rotation, the inside middle part of axis of rotation is provided with movable chamber, the middle part upper end of rotating the lead screw is provided with the elevator that cooperatees and connects, the lower extreme middle part of elevator is provided with the regulating spindle of interlude axis of rotation bottom, the bottom middle part of axis of rotation and the bottom that is located movable chamber are provided with the lubricating structure with regulating spindle matched with, the regulating spindle passes through universal joint and connecting spindle swing joint. Has the advantages that: guarantee the car steering wheel when going up and down, it is more sufficient to lubricate, and eliminate the regulating spindle and feel in jam and gap when going up and down, has very high practicality, is fit for using widely.

The problems of the technology are that: most of axis of rotation of beating now all installs through the instrument in the installation, and the installation is wasted time and energy like this to the bore of installation is fixed, can not install the installation end of difference, simultaneously in installation axis of rotation one end, needs the manual work to lift up the axis of rotation, keeps the axis of rotation balance, and this is wasted time and energy, and the installation mechanism of the axis of rotation of being convenient for is installed to the installation efficiency lower, therefore we provide one kind.

SUMMERY OF THE UTILITY MODEL

Problem to prior art exists, the utility model provides an installation mechanism convenient to installation axis of rotation, it is fixed to possess the axis of rotation installation that can be convenient, simultaneously in installation axis of rotation one end, can keep balance to the axis of rotation, be convenient for install the axis of rotation, the advantage of installation effectiveness has been improved, it all installs through the instrument to have solved current most axis of rotation of beating when the installation, the installation is wasted time and energy like this, and the bore of installation is fixed, can not install the installation end of difference, simultaneously in installation axis of rotation one end, need the manual work to lift up the axis of rotation, keep the axis of rotation balanced, this wastes time and energy, the lower problem of installation effectiveness.

The utility model discloses a realize like this, an installation mechanism convenient to installation axis of rotation, including the axis of rotation main part, axis of rotation main part lower surface middle part correspondence is provided with the loading board, the loading board lower surface is provided with supporting component, supporting component lower extreme fixed mounting has the base plate, axis of rotation main part pot head is equipped with the thread bush, there is the adjusting collar through threaded connection on the thread bush, adjusting collar one end fixed mounting has adjusting part, the adjusting collar rotates and is connected with the locating plate, the through-hole has been seted up at locating plate one side middle part, the adjusting collar rotates and installs on the through-hole, adjusting part is corresponding with the locating plate position, the adjusting part both sides all are provided with the centre gripping subassembly, centre gripping subassembly and locating plate sliding connection.

As the utility model discloses it is preferred, the supporting component includes the support column and supports the cover, support column and base plate fixed connection, the adjustment tank has been seted up to the base plate upper surface, the mounting groove has been seted up to the adjustment tank bottom, fixed mounting has driving motor on the mounting groove, the one end fixed mounting of driving motor output shaft has the lead screw, support the cover lower surface and seted up the thread groove corresponding with the lead screw, support the cover and pass through thread groove and lead screw threaded connection, support the cover and rotate with the loading board and be connected.

As the utility model discloses it is preferred, the equal fixed mounting in loading board both ends has the limiting plate, and is two sets of fixed mounting has the fixed plate between the limiting plate lower surface, the fixed plate lower surface is seted up and is supported the corresponding connecting hole of cover, fixed mounting has the position sleeve under the fixed plate, the position sleeve cover is located on the support column.

As the utility model discloses it is preferred, the adjusting part is including rotating cover and master gear, master gear one end is seted up flutedly, slidable mounting has the dead lever on the recess, the dead lever rotates with the axis of rotation main part to be connected, the equal meshing of master gear both sides is connected with auxiliary gear, auxiliary gear one end fixed mounting has the connecting axle, the connecting axle rotates with the adjusting collar to be connected, rotate cover and adjusting collar fixed connection, the tooth's socket has been seted up to the cover inner wall that rotates, the tooth's socket is connected with auxiliary gear meshing, and is two sets of the equal fixed mounting of the auxiliary gear other end has the connecting rod, connecting rod one end fixed mounting has adjusting gear.

As the utility model discloses it is preferred, the centre gripping subassembly includes the pinion rack, the pinion rack is connected with the adjusting gear meshing, pinion rack one side slidable mounting has the connecting plate, and is two sets of the equal fixed mounting of pinion rack one end has the grip block, grip block and locating plate sliding connection.

As the utility model discloses it is preferred, pinion rack one side fixed mounting has the sliding block, the sliding tray has all been seted up to the one end of connecting plate one side, sliding block slidable mounting is on the sliding tray.

As the utility model discloses it is preferred, grip block one side fixed mounting has the fixed block, fixed block one end fixed mounting has the slider, the spout has all been seted up at the both ends of locating plate one side, slider slidable mounting is on the spout.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses a loading board lower surface sets up supporting component's design, when needs are installed the axis of rotation main part, start driving motor earlier, driving motor can drive through the lead screw and support the cover and reciprocate, it can drive the loading board and reciprocate to support the cover, the loading board can drive the axis of rotation main part, with axis of rotation main part height control to the position of needs afterwards, thereby reached in installation axis of rotation main part, do not need the manual work to lift up the axis of rotation main part, the effect of work efficiency has been improved, the design of threaded connection adjusting collar on the threaded connection adjusting collar, and adjusting collar one end fixed mounting has adjusting component, when the adjusting collar is sheathe in the threaded connection pivoted, the adjusting collar can drive the rotation of rotating collar, can drive auxiliary gear when rotating the cover and rotate, auxiliary gear rotates and can drive adjusting gear and rotate, adjusting gear can drive the grip block through the pinion rack and remove afterwards, can carry out the centre gripping to the place that needs were installed, thereby reached the convenient effect of fixing the axis of rotation main part installation.

2. The utility model discloses a support column, the design of supporting cover, driving motor, lead screw and loading board, driving motor can drive the lead screw and rotate, can drive through the thread groove when the lead screw rotates and support the cover and reciprocate to reach driving motor and can drive the effect that the loading board reciprocated through the lead screw and the cooperation of supporting the cover.

3. The utility model discloses a design of limiting plate, fixed plate, position sleeve, support column and loading board when supporting the cover and reciprocating, can drive the position sleeve through loading board and limiting plate, and the position sleeve can slide on the support column lateral wall to reached can be fine carry out spacing effect of going up and down to the loading board.

4. The utility model discloses a cover, master gear, dead lever, auxiliary gear and adjusting gear's design can drive when the adjusting collar is sheathe in the screw thread and rotates, rotates the cover and passes through the tooth's socket and drive auxiliary gear and rotate, and the master gear can rotate through auxiliary gear, and auxiliary gear passes through the connecting rod and drives adjusting gear and rotate to it can drive adjusting gear pivoted effect to have reached to rotate the cover.

5. The utility model discloses a design of pinion rack, connecting plate and grip block can drive the pinion rack in the time of adjusting gear revolve and rotate in connecting plate one side, and the pinion rack removes and can drive the grip block and remove to reach adjusting gear revolve and can drive the effect that the grip block removed.

6. The utility model discloses a design of pinion rack, sliding block and sliding tray, when the pinion rack removed through adjusting gear, the pinion rack can slide on the sliding tray through the sliding block to reached the sliding block can be so that pinion rack directional movement's effect.

7. The utility model discloses a design of grip block, fixed block, slider and spout, the fixed block can slide on the spout through the slider, grip block ann and fixed block fixed connection to gliding effect on the spout that the grip block can be on the locating plate has been reached.

Drawings

Fig. 1 is a schematic perspective view of the overall structure provided by the embodiment of the present invention;

fig. 2 is a schematic perspective view of a clamping assembly according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of an adjusting assembly provided in an embodiment of the present invention;

fig. 4 is a schematic perspective view of a support assembly structure provided by an embodiment of the present invention.

In the figure: 1. a rotating shaft main body; 2. a substrate; 3. a support assembly; 4. a limiting plate; 5. a carrier plate; 6. a threaded sleeve; 7. an adjusting sleeve; 8. positioning a plate; 9. an adjustment assembly; 10. a positioning sleeve; 11. a chute; 12. a clamping assembly; 13. a slider; 14. a sliding groove; 15. a slider; 16. a fixing plate; 301. a support pillar; 302. a drive motor; 303. a screw rod; 304. a support sleeve; 901. rotating the sleeve; 902. a tooth socket; 903. a main gear; 904. a connecting shaft; 905. an auxiliary gear; 906. a connecting rod; 907. an adjusting gear; 908. fixing the rod; 1201. a fixed block; 1202. a clamping plate; 1203. a connecting plate; 1204. a toothed plate.

Detailed Description

For further understanding the contents, features and effects of the present invention, the following embodiments will be illustrated in detail with reference to the accompanying drawings.

The structure of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the embodiment of the utility model provides a mounting mechanism convenient to installation axis of rotation, including axis of rotation main part 1, the correspondence of 1 lower surface middle part of axis of rotation main part is provided with loading board 5, loading board 5 lower surface is provided with supporting

component

3, 3 lower extreme fixed mounting of supporting component has

base plate

2, 1 pot head of axis of rotation main part is equipped with thread bush 6, there is adjusting collar 7 through threaded connection on the

thread bush

6, 7 one end fixed mounting of adjusting collar has adjusting part 9, adjusting collar 7 rotates and is connected with locating plate 8, the through-hole has been seted up at 8 one side middle parts of locating plate, adjusting collar 7 rotates and installs on the through-hole, adjusting part 9 is corresponding with 8 positions of locating plate, adjusting part 9 both sides all are provided with clamping component 12, clamping

component

12 and 8 sliding connection of locating plate.

Adopt above-mentioned scheme: through the design that bearing board 5 lower surface set up supporting component 3, when needs are installed to axis of rotation main part 1, start driving motor 302 earlier, driving motor 302 can drive through lead screw 303 and support cover 304 and reciprocate, support cover 304 can drive bearing board 5 and reciprocate, bearing board 5 can drive axis of rotation main part 1, with axis of rotation main part 1 height adjustment to required position afterwards, thereby reached when installing axis of rotation main part 1, do not need the manual work to lift axis of rotation main part 1, the effect of work efficiency has been improved, threaded connection adjusting sleeve 7's design on the thread bush 6, and adjusting sleeve 7 one end fixed mounting has adjusting component 9, when adjusting sleeve 7 rotates on thread bush 6, adjusting sleeve 7 can drive and rotate cover 901 and rotate, can drive auxiliary gear 905 and rotate when rotating cover 901 and rotating, auxiliary gear rotates 905 can connect pole 906 and drive adjusting gear 907 and rotate, then adjusting gear 907 can drive the grip block 1202 through pinion 1204 and move, can carry out the centre gripping to the place that needs the installation, thereby reached the convenient effect of fixing axis of rotation main part 1 installation.

Referring to fig. 4, the supporting assembly 3 includes a supporting column 301 and a supporting sleeve 304, the supporting column 301 is fixedly connected to the substrate 2, an adjusting groove is formed in the upper surface of the substrate 2, an installation groove is formed in the bottom of the adjusting groove, a driving motor 302 is fixedly installed on the installation groove, a lead screw 303 is fixedly installed at one end of an output shaft of the driving motor 302, a thread groove corresponding to the lead screw 303 is formed in the lower surface of the supporting sleeve 304, the supporting sleeve 304 is in threaded connection with the lead screw 303 through the thread groove, and the supporting sleeve 304 is rotatably connected to the bearing plate 5.

Adopt above-mentioned scheme: through the design of support column 301, support cover 304, driving motor 302, lead screw 303 and loading board 5, driving motor 302 can drive lead screw 303 and rotate, and lead screw 303 can drive support cover 304 through the thread groove and reciprocate when rotating to reach the effect that driving motor 302 can drive loading board 5 through the cooperation of lead screw 303 and support cover 304 and reciprocate.

Referring to fig. 4, the two ends of the bearing plate 5 are both fixedly provided with the limiting plates 4, the fixing plate 16 is fixedly arranged between the lower surfaces of the two sets of limiting plates 4, the lower surface of the fixing plate 16 is provided with a connecting hole corresponding to the supporting sleeve 304, the lower surface of the fixing plate 16 is fixedly provided with the positioning sleeve 10, and the supporting column 301 is sleeved with the positioning sleeve 10.

Adopt above-mentioned scheme: through the design of limiting plate 4, fixed plate 16, position sleeve 10, support column 301 and loading board 5, when supporting sleeve 304 and reciprocate, can drive position sleeve 10 through loading board 5 and limiting plate 4, position sleeve 10 can slide on support column 301 lateral wall to reach the effect that can be fine carry out spacing lift to loading board 5.

Referring to fig. 3, the adjusting assembly 9 includes a rotating sleeve 901 and a main gear 903, one end of the main gear 903 is provided with a groove, a fixing rod 908 is slidably mounted on the groove, the fixing rod 908 is rotatably connected with the rotating shaft main body 1, two sides of the main gear 903 are respectively engaged with an auxiliary gear 905, one end of the auxiliary gear 905 is fixedly mounted with a connecting shaft 904, the connecting shaft 904 is rotatably connected with the adjusting sleeve 7, the rotating sleeve 901 is fixedly connected with the adjusting sleeve 7, an inner wall of the rotating sleeve 901 is provided with a tooth slot 902, the tooth slot 902 is engaged with the auxiliary gear 905, the other ends of the two sets of auxiliary gears 905 are respectively fixedly mounted with a connecting rod 906, and one end of the connecting rod 906 is fixedly mounted with an adjusting gear 907.

The scheme is adopted: through the design of the rotating sleeve 901, the main gear 903, the fixing rod 908, the auxiliary gear 905 and the adjusting gear 907, when the adjusting sleeve 7 rotates on the threaded sleeve 6, the rotating sleeve 901 is driven to rotate, the rotating sleeve 901 drives the auxiliary gear 905 to rotate through the tooth slot 902, the main gear 903 can rotate through the auxiliary gear 905, the auxiliary gear 905 drives the adjusting gear 907 to rotate through the connecting rod 906, and therefore the effect that the adjusting gear 907 can be driven to rotate by rotating the rotating sleeve 901 is achieved.

Referring to fig. 3, the clamping assembly 12 includes a toothed plate 1204, the toothed plate 1204 is engaged with the adjusting gear 907, a connecting plate 1203 is slidably mounted on one side of the toothed plate 1204, clamping plates 1202 are fixedly mounted on one ends of two sets of toothed plates 1204, and the clamping plates 1202 are slidably connected with the positioning plate 8.

Adopt above-mentioned scheme: through the design of pinion rack 1204, connecting plate 1203 and grip block 1202, can drive pinion rack 1204 and rotate in connecting plate 1203 one side when adjusting gear 907 rotates, pinion rack 1204 removes and can drive grip block 1202 and move to reach the effect that adjusting gear 907 rotates and can drive grip block 1202 and move.

Referring to fig. 3, a sliding block 15 is fixedly mounted on one side of the toothed plate 1204, a sliding groove 14 is formed in one end of one side of the connecting plate 1203, and the sliding block 15 is slidably mounted on the sliding groove 14.

Adopt above-mentioned scheme: through the design of the toothed plate 1204, the sliding blocks 15 and the sliding grooves 14, when the toothed plate 1204 moves through the adjusting gear 907, the toothed plate 1204 can slide on the sliding grooves 14 through the sliding blocks 15, so that the effect that the sliding blocks 15 can enable the toothed plate 1204 to move directionally is achieved.

Referring to fig. 2, a fixing block 1201 is fixedly mounted on one side of the clamping plate 1202, a sliding block 13 is fixedly mounted at one end of the fixing block 1201, sliding grooves 11 are formed in both ends of one side of the positioning plate 8, and the sliding block 13 is slidably mounted on the sliding grooves 11.

Adopt above-mentioned scheme: through the design of the clamping plate 1202, the fixed block 1201, the sliding block 13 and the sliding groove 11, the fixed block 1201 can slide on the sliding groove 11 through the sliding block 13, and the clamping plate 1202 is fixedly connected with the fixed block 1201, so that the effect that the clamping plate 1202 can slide on the sliding groove 11 on the positioning plate 8 is achieved.

The utility model discloses a theory of operation:

when using, when needs are installed axis of rotation main part 1, start driving motor 302 earlier, driving motor 302 can drive through lead screw 303 and support cover 304 and reciprocate, support cover 304 can drive loading board 5 and reciprocate, loading board 5 can drive axis of rotation main part 1, with axis of rotation main part 1 height adjustment to required position afterwards, when adjusting collar 7 pivoted on thread bush 6, adjusting collar 7 can drive and rotate cover 901 and rotate, can drive auxiliary gear 905 and rotate when rotating cover 901 and rotating, auxiliary gear 905 rotates and can connecting rod 906 drive adjusting gear 907 rotates, adjusting gear 907 can drive grip block 1202 through pinion rack 1204 afterwards and move, can carry out the centre gripping to the place that needs the installation.

In summary, the following steps: this installation mechanism convenient to installation axis of rotation, through axis of rotation main part 1, supporting component 3, limiting plate 4, loading board 5, thread bush 6, adjusting collar 7, locating plate 8, adjusting component 9, locating collar 10, the cooperation between centre gripping subassembly 12 and the fixed plate 16, it all installs through the instrument to have solved the current axis of rotation of majority of beating when the installation, the installation is wasted time and energy like this, and the bore of installation is fixed, can not install the installation end of difference, simultaneously in the time of installation axis of rotation one end, need the manual work to lift up the axis of rotation, keep the axis of rotation balanced, this is wasted time and energy, the lower problem of installation effectiveness.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an installation mechanism convenient to installation axis of rotation, includes axis of rotation main part (1), its characterized in that: the utility model discloses a bearing plate, including axis of rotation main part (1), axis of rotation main part (1) lower surface middle part correspondence is provided with loading board (5), loading board (5) lower surface is provided with supporting component (3), supporting component (3) lower extreme fixed mounting has base plate (2), axis of rotation main part (1) pot head is equipped with thread bush (6), there is adjusting collar (7) through threaded connection on thread bush (6), adjusting collar (7) one end fixed mounting has adjusting part (9), adjusting collar (7) rotate and are connected with locating plate (8), the through-hole has been seted up at locating plate (8) one side middle part, adjusting collar (7) rotate and install on the through-hole, adjusting part (9) are corresponding with locating plate (8) position, adjusting part (9) both sides all are provided with centre gripping subassembly (12), centre gripping subassembly (12) and locating plate (8) sliding connection.

2. A mounting mechanism for facilitating the mounting of a rotatable shaft as claimed in claim 1, wherein: support assembly (3) are including support column (301) and support cover (304), support column (301) and base plate (2) fixed connection, the adjustment tank has been seted up to base plate (2) upper surface, the mounting groove has been seted up to the adjustment tank bottom, fixed mounting has driving motor (302) on the mounting groove, the one end fixed mounting of driving motor (302) output shaft has lead screw (303), support cover (304) lower surface and set up the thread groove corresponding with lead screw (303), support cover (304) through thread groove and lead screw (303) threaded connection, support cover (304) and loading board (5) and rotate and be connected.

3. A mounting mechanism for facilitating the mounting of a rotatable shaft as claimed in claim 1, wherein: the equal fixed mounting in loading board (5) both ends has limiting plate (4), and is two sets of fixed mounting has fixed plate (16) between limiting plate (4) lower surface, fixed plate (16) lower surface is seted up and is supported the corresponding connecting hole of cover (304), fixed plate (16) lower fixed surface installs position sleeve (10), position sleeve (10) cover is located on support column (301).

4. A mounting mechanism for facilitating the mounting of a rotatable shaft as claimed in claim 1, wherein: the adjusting assembly (9) comprises a rotating sleeve (901) and a main gear (903), one end of the main gear (903) is provided with a groove, a fixing rod (908) is slidably mounted on the groove, the fixing rod (908) is rotatably connected with the rotating shaft main body (1), two sides of the main gear (903) are respectively connected with an auxiliary gear (905) in a meshed mode, one end of the auxiliary gear (905) is fixedly provided with a connecting shaft (904), the connecting shaft (904) is rotatably connected with an adjusting sleeve (7), the rotating sleeve (901) is fixedly connected with the adjusting sleeve (7), the inner wall of the rotating sleeve (901) is provided with a tooth groove (902), the tooth groove (902) is meshed with the auxiliary gear (905), the other ends of the two groups of auxiliary gears (905) are respectively and fixedly provided with a connecting rod (906), and one end of the connecting rod (906) is fixedly provided with an adjusting gear (907).

5. A mounting mechanism for facilitating the mounting of a rotatable shaft as claimed in claim 1, wherein: the clamping assembly (12) comprises a toothed plate (1204), the toothed plate (1204) is meshed with the adjusting gear (907), a connecting plate (1203) is slidably mounted on one side of the toothed plate (1204), clamping plates (1202) are fixedly mounted at one ends of the two groups of toothed plates (1204), and the clamping plates (1202) are slidably connected with the positioning plate (8).

6. A mounting mechanism for facilitating the mounting of rotating shafts as claimed in claim 5, wherein: toothed plate (1204) one side fixed mounting has sliding block (15), sliding tray (14) have all been seted up to the one end of connecting plate (1203) one side, sliding block (15) slidable mounting is on sliding tray (14).

7. A mounting mechanism for facilitating the mounting of a rotatable shaft as claimed in claim 5 wherein: the clamping plate is characterized in that a fixing block (1201) is fixedly mounted on one side of the clamping plate (1202), a sliding block (13) is fixedly mounted at one end of the fixing block (1201), sliding grooves (11) are formed in two ends of one side of the positioning plate (8), and the sliding block (13) is slidably mounted on the sliding grooves (11).