CN114311122A - Material clamping device with compensation function for flexible plastic lamp punching equipment - Google Patents

Abstract

The invention discloses a material clamping device for flexible plastic lamp punching equipment with a compensation function, which belongs to the technical field of lamp processing equipment and comprises a workbench, a rack and a punching device, wherein a hydraulic rod at the bottom of a hydraulic cylinder extends into an inner cavity of the rack and is fixedly connected with the punching device, a supporting plate is fixedly arranged on the outer wall of the right side of the top of the workbench, two groups of sliding grooves are arranged on the outer wall of the top of the supporting plate, the compensation devices are inserted and connected in a sliding manner at the top ends of the inner cavities of the sliding grooves, clamping plates are arranged on the outer walls of one sides of the two groups of compensation devices which are close to each other, a moving block drives the clamping plates to move inwards through expansion of a supporting spring in the device, so that the clamping plates can continuously provide a stable supporting force for a lamp shell, the phenomenon that the lamp shell is insufficiently contacted with the lamp shell due to the fact that the clamping plates are sunken towards the middle part of the supporting plate when the lamp shell is extruded is avoided, and the lamp shell cannot accidentally move in the processing process, the accuracy of lamp shell processing is guaranteed.

Description

Material clamping device with compensation function for flexible plastic lamp punching equipment

Technical Field

The invention relates to the technical field of lamp processing equipment, in particular to a clamping device with a compensation function for flexible plastic lamp drilling equipment.

Background

When a lamp is processed, holes need to be formed in a shell of the lamp, when an existing lamp shell is processed, in order to ensure that the lamp shell does not move when being processed, the processed lamp shell needs to be fixed, two groups of clamping plates are generally close to each other to be attached to the lamp shell, the lamp shell is fixed on a workbench, however, when the flexible plastic lamp shell is processed and punched, a punch of a punching device needs to move downwards to punch holes on the surface of the lamp shell, in the process, the punch moves downwards to press the lamp shell, and the lamp shell can deform and bend when being extruded, so that the lamp shell can dent towards a punching area, the edge of the lamp shell can move inwards, the pressure between the lamp shell and the clamping plates is reduced, the situation that the contact between the clamping plates and the lamp shell is insufficient, and the fixing effect of the clamping plates on the lamp shell is weakened, the lamp shell is easy to move in the machining process, the machining precision of the lamp shell is affected, and therefore the clamping device with the compensation function for the flexible plastic lamp punching equipment is provided.

Disclosure of Invention

The invention aims to provide a material clamping device with a compensation function for flexible plastic lamp drilling equipment, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a flexible plastics lamps and lanterns are clamp material device for drilling equipment with compensation function, includes workstation, frame and punching device, frame fixed mounting is on the top left side outer wall of workstation, frame top outer wall fixed mounting has the pneumatic cylinder, and in the pneumatic cylinder bottom hydraulic stem extend to the inner chamber of frame and with punching device fixed connection, workstation top right side outer wall fixed mounting has the layer board, two sets of spouts have been seted up to layer board top outer wall, spout inner chamber top slides and pegs graft and has compensation arrangement, and is two sets of one side outer wall that compensation arrangement is close to each other all is provided with splint.

Preferably, the compensation device comprises a sliding block which is inserted into an inner cavity of the sliding groove in a sliding mode, a bidirectional screw is installed on the outer wall of the right side of the supporting plate in a rotating mode, the left end of the bidirectional screw penetrates through the two sets of sliding blocks and extends into the inner cavity of the sliding groove in the left side, a threaded hole is formed in the connecting portion of the sliding block and the bidirectional screw, the top end of the sliding block extends to the outer wall of the top of the supporting plate and is fixedly connected with the mounting frame, the mounting frame is provided with a moving groove in the outer wall, the outer wall of one side, close to each other, of the mounting frame is provided with a moving block in a sliding and inserting mode, a supporting spring is fixedly installed between the moving block and the moving groove, and the outer wall of one side, close to each other, of the two sets of moving blocks is fixedly connected with the outer wall, far away from each other, of the two sets of clamping plates.

Preferably, two sets of the mutual one side outer wall of keeping away from of installing frame all the spiro union have the threaded rod, the one end that the threaded rod is close to the installing frame extends to in the inner chamber of shifting chute and is connected with the piston board rotation, and piston board slidable mounting is in the inner chamber of shifting chute, and shifting chute inner chamber slidable mounting has the backup pad, the piston board was kept away from to the backup pad one side outer wall and the one end fixed connection that the movable block was kept away from to supporting spring.

Preferably, installing frame top outer wall fixed mounting has the gas tank, the trompil has been seted up to installing frame top outer wall, and the trompil is located between piston plate and the backup pad, and the moving groove inner chamber passes through trompil and gas tank intercommunication, gas tank inner chamber slidable mounting has the piston piece, fixed mounting has the shrink spring between piston piece top outer wall and the gas tank top inner wall, the opening has been seted up to gas tank top outer wall, piston piece bottom outer wall fixed mounting has the stay cord, the one end that the piston piece was kept away from to the stay cord extend to the outside of gas tank and with splint outer wall fixed connection.

Preferably, it is two sets of one side outer wall that the installing frame was kept away from each other all is provided with the gag lever post, the one end that the gag lever post is close to the installing frame extends to in the inner chamber of shifting chute and keeps away from one side outer wall fixed connection of supporting spring with the backup pad, the mounting groove has been seted up to gag lever post top outer wall, evenly articulated between the both sides inner wall around the mounting groove have the stopper, fixed mounting has expanding spring between stopper and the mounting groove, mounting groove inner chamber bottom slidable mounting has the piece of drawing, draw evenly to be provided with even rope between piece top outer wall and the stopper bottom outer wall, the one end that the backup pad was kept away from to the piece extends to the outside of gag lever post.

Preferably, two sets of the guide way has all been seted up to the one side outer wall that the slider is close to each other, and the guide way inner chamber slides and pegs graft and have the guide block, and fixed mounting has reset spring between guide block and the guide way, and one side outer wall and installation pole fixed connection that the slider was kept away from to the guide block, and two sets of one side top outer wall that the installation pole is close to each other and one side bottom outer wall that two sets of splint kept away from each other all are provided with the magnetic path, and two sets of magnetic paths laminate each other, the mounting groove has been seted up to spout inner chamber bottom, the mounting groove inner chamber is provided with the tray, and tray top outer wall and installation pole bottom end laminate.

Preferably, the tray outer wall and mounting groove inner wall sliding connection, it is two sets of the equal fixed mounting of one side outer wall that the tray was kept away from each other has the carriage release lever, the one end that the tray was kept away from to the carriage release lever extends to the outside of layer board, the equal fixed mounting of layer board left and right sides outer wall has the installation piece, and installation piece top outer wall spiro union has the bolt, and the bolt bottom extends to the bottom outer wall of installation piece and laminates mutually with carriage release lever top outer wall.

Compared with the prior art, the invention has the beneficial effects that:

1. the device is expanded through the supporting spring, so that the moving block drives the clamping plate to move inwards, the clamping plate can continue to provide a stable supporting force for the lamp shell, the phenomenon that the lamp shell is sunken towards the middle part of the supporting plate when being extruded to enable the clamping plate to be insufficiently contacted with the lamp shell is avoided, the lamp shell cannot move accidentally in the processing process, and the processing accuracy of the lamp shell is ensured;

2. the threaded rod is rotated to enable the piston plate to slide in the inner cavity of the moving groove, so that the distance between the piston plate and the supporting plate is changed, the air pressure between the piston plate and the supporting plate is changed, the supporting plate can move leftwards or rightwards, the compression degree of the supporting spring is changed, the supporting force of the supporting spring on the clamping plate can be changed, the compensating device is adjusted, and the using effect of the compensating device is improved.

Drawings

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

FIG. 2 is a schematic cross-sectional view of a compensating device according to the present invention;

FIG. 3 is an enlarged view of the structure at A of the present invention;

FIG. 4 is an enlarged view of the structure at B of the present invention;

FIG. 5 is a schematic cross-sectional view of the stop lever according to the present invention.

In the figure: 1. a work table; 2. a frame; 3. a punching device; 4. a support plate; 5. a splint; 6. a compensation device; 61. installing a frame; 62. a slider; 63. a moving block; 64. a support spring; 65. a support plate; 66. a threaded rod; 67. a piston plate; 68. a gas storage tank; 69. pulling a rope; 610. a magnetic block; 611. mounting a rod; 612. a return spring; 613. mounting grooves; 614. a support block; 615. a travel bar; 616. a piston block; 617. a limiting rod; 618. a limiting block; 619. a tension spring; 620. pulling the block; 621. a placing groove; 7. a bidirectional screw; 8. a chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: a clamping device with a compensation function for flexible plastic lamp punching equipment, please refer to fig. 1, comprises a workbench 1, a frame 2 and a punching device 3;

referring to fig. 1, a frame 2 is fixedly mounted on the outer wall of the left side of the top of a workbench 1, a hydraulic cylinder is fixedly mounted on the outer wall of the top of the frame 2, a hydraulic rod at the bottom of the hydraulic cylinder extends into an inner cavity of the frame 2 and is fixedly connected with a punching device 3, and the punching device 3 is composed of punching heads;

referring to fig. 1 and 2, a supporting plate 4 is fixedly mounted on the outer wall of the right side of the top of a workbench 1, two groups of sliding grooves 8 are formed in the outer wall of the top of the supporting plate 4, a compensation device 6 is inserted into the top end of an inner cavity of each sliding groove 8 in a sliding manner, clamping plates 5 are arranged on the outer walls of the two groups of compensation devices 6 on the sides close to each other, and electric equipment related to the devices are electrically connected with an external power switch through wires;

referring to fig. 2 and 3, the compensating device 6 includes a sliding block 62 slidably inserted into an inner cavity of the sliding groove 8, a bidirectional screw 7 is rotatably installed on an outer wall of a right side of the supporting plate 4, a left end of the bidirectional screw 7 penetrates through the two sets of sliding blocks 62 and extends into an inner cavity of the sliding groove 8 of a left side, a threaded hole is formed at a connecting portion of the sliding block 62 and the bidirectional screw 7, a top end of the sliding block 62 extends to an outer wall of a top portion of the supporting plate 4 and is fixedly connected with the mounting frame 61, moving grooves are formed in outer walls of two sets of mounting frames 61 on sides close to each other, moving blocks 63 are slidably inserted into the inner cavity of the moving grooves, a supporting spring 64 is fixedly installed between the moving blocks 63 and the moving grooves, outer walls of two sets of moving blocks 63 on sides close to each other are fixedly connected with outer walls of two sets of clamping plates 5 on sides far away from each other, when a lamp is processed, a housing of the lamp is placed above the supporting plate 4, then the bidirectional screw 7 is rotated to cause the two sets of sliding blocks 62 to move inwards, the two groups of clamping plates 5 are mutually closed to contact with the outer wall of the lamp shell, the lamp shell is fixed above the supporting plate 4, then the hydraulic cylinder works to drive the hydraulic rod to drive the punching device 3 to move downwards, when the lamp shell is punched, the punch of the punching device 3 moves downwards and extrudes the lamp shell, and the lamp shell has certain flexibility, therefore, when the lamp shell is pressed, the lamp shell is sunken towards the middle part of the supporting plate 4, the contact area between the lamp shell and the clamping plate 5 is moved inwards, the moving block 63 drives the clamping plate 5 to move inwards by expanding the supporting spring 64, so that the clamping plate 5 is continuously attached to the lamp shell, the clamping plate 5 can continuously provide a stable supporting force for the lamp shell, the lamp shell cannot move accidentally in the processing process, and the processing accuracy of the lamp shell is ensured;

referring to fig. 2 and 3, the outer walls of the two sets of mounting frames 61 at the sides far away from each other are respectively screwed with a threaded rod 66, one end of the threaded rod 66 close to the mounting frame 61 extends into the inner cavity of the moving groove and is rotatably connected with the piston plate 67, air is filled between the piston plate 67 and the supporting plate 65 to make air pressure between the piston plate 67 and the supporting plate 65 for supporting the supporting plate 65, the piston plate 67 is slidably mounted in the inner cavity of the moving groove, the supporting plate 65 is slidably mounted in the inner cavity of the moving groove, the outer wall of the supporting plate 65 at the side far away from the piston plate 67 is fixedly connected with one end of the supporting spring 64 far away from the moving block 63, the threaded rod 66 is rotated to make the piston plate 67 slide in the inner cavity of the moving groove, so that the distance between the piston plate 67 and the supporting plate 65 is changed, thereby changing the air pressure between the piston plate 67 and the supporting plate 65, and making the supporting plate 65 move left or right, the compression degree of the supporting spring 64 is changed, so that the supporting force of the supporting spring 64 on the clamping plate 5 can be changed, the compensating device 6 is adjusted, the clamping plate 5 can provide stable supporting force on the lamp shell, the machining accuracy of the lamp shell is guaranteed, and the using effect of the compensating device 6 is improved;

referring to fig. 2 and 3, an air storage box 68 is fixedly installed on the outer wall of the top of the mounting frame 61, an opening is formed in the outer wall of the top of the mounting frame 61, the opening is located between the piston plate 67 and the support plate 65, the inner cavity of the moving groove is communicated with the air storage box 68 through the opening, a piston block 616 is slidably installed in the inner cavity of the air storage box 68, a retraction spring is fixedly installed between the outer wall of the top of the piston block 616 and the inner wall of the top of the air storage box 68, an opening is formed in the outer wall of the top of the air storage box 68, a pull rope 69 is fixedly installed on the outer wall of the bottom of the piston block 616, one end of the pull rope 69, which is far away from the piston block 616, extends to the outer side of the air storage box 68 and is fixedly connected with the outer wall of the clamp plate 5, the lamp housing is recessed towards the middle of the support plate 4 in the processing process, when the clamp plate 5 moves inwards, the clamp plate 5 pulls the pull rope 69 to move the piston block 616 to move downwards, air in the air storage box 68 is extruded into the moving groove, the air pressure between the supporting plate 65 and the piston plate 67 is increased, so that the supporting plate 65 is pushed inwards, the compression degree of the supporting spring 64 is increased, after the supporting spring 64 drives the moving block 63 and the clamping plate 5 to move inwards, the supporting force provided by the supporting spring 64 to the moving block 63 and the clamping plate 5 cannot be reduced, the clamping plate 5 is ensured to provide stable clamping force for the lamp shell, the lamp shell is further ensured not to move in the processing process, and the service performance of the compensating device 6 is increased;

referring to fig. 3 and 5, the outer walls of the two sets of mounting frames 61 at the sides far away from each other are provided with a limiting rod 617, one end of the limiting rod 617 close to the mounting frame 61 extends into the inner cavity of the moving groove and is fixedly connected with the outer wall of the supporting plate 65 at the side far away from the supporting spring 64, the outer wall of the top of the limiting rod 617 is provided with a mounting groove 621, the inner walls of the front and back sides of the mounting groove 621 are uniformly hinged with a limiting block 618, the limiting block 618 is supported by a telescopic spring 619, the limiting block 618 is in contact with the piston plate 67 to limit the supporting plate 65, the supporting plate 65 cannot automatically move outwards, the degree of compression of the supporting spring 64 is reduced, the supporting force provided by the supporting spring 64 to the clamping plate 5 is not too small, the use effect of the compensating device 6 is increased, a telescopic spring 619 is fixedly installed between the limiting block 618 and the mounting groove 621, the bottom of the inner cavity of the mounting groove 621 is slidably installed with a pulling block 620, connecting ropes are uniformly arranged between the outer wall of the top of the pull block 620 and the outer wall of the bottom of the limiting block 618, one end, far away from the supporting plate 65, of the pull block 620 extends to the outer side of the limiting rod 617, the pull block 620 is pulled outwards, the connecting ropes can drive the limiting block 618 to move inwards, the limiting block 618 can be moved into the inner cavity of the placing groove 621, the limiting rod 617 can be pulled outwards, and it is guaranteed that a worker can move the supporting plate 65 outwards;

referring to fig. 2, 3 and 4, the outer wall of the side of the two sets of sliding blocks 62 close to each other is provided with a guide slot, the inner cavity of the guide slot is inserted with a guide block in a sliding manner, a return spring 612 is fixedly installed between the guide block and the guide slot, the outer wall of the side of the guide block far from the sliding block 62 is fixedly connected with an installation rod 611, the outer wall of the top of the side of the two sets of installation rods 611 close to each other and the outer wall of the bottom of the side of the two sets of clamping plates 5 far from each other are provided with magnetic blocks 610, the two sets of magnetic blocks 610 are attached to each other, the bottom of the inner cavity of the sliding slot 8 is provided with an installation groove 613, the inner cavity of the installation groove 613 is provided with a support block 614, the outer wall of the top of the support block 614 is attached to the bottom end of the installation rod 611, the attached magnetic blocks 610 have opposite magnetic poles and generate a suction force, so that the clamping plate 5 is normally attached to the installation frame 61, the compensation device 6 cannot automatically work, when the two-way screw 7 is rotated, so that the clamping plates 5 move inwards to fix the lamp housing, the slider 62 carries the mounting bar 611 to move inward, so that the mounting bar 611 does not contact the holder 614, the guide block drives the mounting rod 611 to move downwards by the reset spring 612, the mounting rod 611 drives the outer magnetic blocks 610 to move downwards, the two groups of magnetic blocks 610 are not attached, the magnetic force between the magnetic blocks 610 disappears, the supporting spring 64 can normally push the splint 5 to move, the compensation device 6 cannot be automatically triggered when the splint 5 is not used, and after the processing is finished, when the bidirectional screw 7 is rotated to make the slide block 62 carry the clamping plate 5 to move outwards, the mounting rod 611 is driven to move outwards, so that the mounting rod 611 contacts with the top wall of the supporting block 614, the mounting rod 611 is pushed upwards, the two groups of magnetic blocks 610 move to the same horizontal line, the clamping plate 5 can be pulled outwards by the attraction force between the magnetic blocks 610, so that the clamping plate 5 is attached to the mounting frame 61, and the compensation device 6 cannot work when the clamping plate 5 is not used;

referring to fig. 2 and 4, the outer walls of the supporting blocks 614 are slidably connected to the inner wall of the mounting groove 613, the outer walls of the two groups of supporting blocks 614 on the side away from each other are fixedly provided with a moving rod 615, one end of the moving rod 615 away from the supporting blocks 614 extends to the outer side of the supporting plate 4, the outer walls of the left side and the right side of the supporting plate 4 are fixedly provided with mounting blocks, the outer wall of the top of each mounting block is screwed with a bolt, the bottom end of the bolt extends to the outer wall of the bottom of each mounting block and is attached to the outer wall of the top of the moving rod 615, the bolt is unscrewed and is not attached to the moving rod 615, the moving rod 615 is pulled to drive the supporting blocks 614 to move left and right for changing the positions of the supporting blocks 614, the positions of the mounting rods 611 to move downwards are changed, the conditions for starting the operation of the compensation device 6 can be adjusted as required, and the using effect of the compensation device 6 is increased.

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 (7)

1. The utility model provides a flexible plastics lamps and lanterns are clamping device for drilling equipment with compensation function, includes workstation (1), frame (2) and punching device (3), its characterized in that: frame (2) fixed mounting is on the top left side outer wall of workstation (1), frame (2) top outer wall fixed mounting has the pneumatic cylinder, and pneumatic cylinder bottom hydraulic stem extend to in the inner chamber of frame (2) and with punching device (3) fixed connection, workstation (1) top right side outer wall fixed mounting has layer board (4), two sets of spout (8) have been seted up to layer board (4) top outer wall, spout (8) inner chamber top slip is pegged graft and is had compensation arrangement (6), and is two sets of compensation arrangement (6) one side outer wall that is close to each other all is provided with splint (5).

2. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment according to claim 1, characterized in that: the compensation device (6) comprises a slide block (62) which is inserted in the inner cavity of the sliding chute (8) in a sliding way, the outer wall of the right side of the supporting plate (4) is rotatably provided with a bidirectional screw (7), the left end of the bidirectional screw (7) penetrates through two groups of sliding blocks (62) and extends into the inner cavity of the left sliding chute (8), the connecting part of the slide block (62) and the bidirectional screw (7) is provided with a threaded hole, the top end of the sliding block (62) extends to the outer wall of the top of the supporting plate (4) and is fixedly connected with the mounting frames (61), the outer walls of the two groups of mounting frames (61) at the sides close to each other are provided with moving grooves, and a moving block (63) is inserted into the inner cavity of the moving groove in a sliding manner, a supporting spring (64) is fixedly installed between the moving block (63) and the moving groove, and the outer wall of one side, close to each other, of the two sets of moving blocks (63) is fixedly connected with the outer wall of one side, far away from each other, of the two sets of clamping plates (5).

3. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment, according to claim 2, is characterized in that: two sets of one side outer wall that installing frame (61) kept away from each other all the spiro union have threaded rod (66), threaded rod (66) are close to the one end of installing frame (61) and extend to in the inner chamber of shifting chute and rotate with piston plate (67) and be connected, and piston plate (67) slidable mounting in the inner chamber of shifting chute, and shift chute inner chamber slidable mounting has backup pad (65), one side outer wall that piston plate (67) were kept away from in backup pad (65) and supporting spring (64) keep away from the one end fixed connection of movable block (63).

4. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment according to claim 3, characterized in that: installing frame (61) top outer wall fixed mounting has gas tank (68), the trompil has been seted up to installing frame (61) top outer wall, and the trompil is located between piston plate (67) and backup pad (65), and removes the groove inner chamber and pass through trompil and gas tank (68) intercommunication, gas tank (68) inner chamber slidable mounting has piston block (616), fixed mounting has shrink spring between piston block (616) top outer wall and gas tank (68) top inner wall, the opening has been seted up to gas tank (68) top outer wall, piston block (616) bottom outer wall fixed mounting has stay cord (69), the one end that piston block (616) was kept away from in stay cord (69) extends to the outside of gas tank (68) and with splint (5) outer wall fixed connection.

5. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment according to claim 4, characterized in that: two sets of one side outer wall that installing frame (61) kept away from each other all is provided with gag lever post (617), gag lever post (617) are close to one side outer wall fixed connection that supporting spring (64) was kept away from to the one end of installing frame (61) extend to in the inner chamber of shifting chute and with backup pad (65), mounting groove (621) have been seted up to gag lever post (617) top outer wall, evenly articulated between mounting groove (621) the front and back both sides inner wall have stopper (618), fixed mounting has expanding spring (619) between stopper (618) and mounting groove (621), mounting groove (621) inner chamber bottom slidable mounting has pull block (620), evenly be provided with even rope between pull block (620) top outer wall and stopper (618) bottom outer wall, the one end that supporting pad (65) were kept away from to pull block (620) extends to the outside of gag lever post (617).

6. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment, according to claim 2, is characterized in that: two sets of the guide way has all been seted up to one side outer wall that slider (62) are close to each other, and the guide way inner chamber slides and pegs graft and have the guide block, and fixed mounting has reset spring (612) between guide block and the guide way, and one side outer wall and installation pole (611) fixed connection that slider (62) were kept away from to the guide block, and two sets of one side top outer wall that installation pole (611) are close to each other and one side bottom outer wall that two sets of splint (5) were kept away from each other all are provided with magnetic path (610), and two sets of magnetic path (610) laminate each other, mounting groove (613) have been seted up to spout (8) inner chamber bottom, mounting groove (613) inner chamber is provided with tray (614), and tray (614) top outer wall laminates with installation pole (611) bottom mutually.

7. The material clamping device with the compensation function for the flexible plastic lamp drilling equipment according to claim 6, characterized in that: the utility model discloses a support structure, including tray (614) outer wall and mounting groove (613) inner wall sliding connection, it is two sets of the equal fixed mounting of one side outer wall that tray (614) kept away from each other has carriage release lever (615), the one end that tray (614) were kept away from in carriage release lever (615) extends to the outside of layer board (4), the equal fixed mounting of layer board (4) left and right sides outer wall has the installation piece, and installs the bolt of piece top outer wall spiro union, and the bolt bottom extends to the bottom outer wall of installation piece and laminates mutually with carriage release lever (615) top outer wall.

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