Multi-specification customized numerical control carton cutting machine

Abstract

The utility model relates to the technical field of carton cutting, and discloses a multi-specification customized numerical control carton cutting machine which comprises a workbench, U-shaped frames are fixedly connected to the front side and the rear side of the top of the workbench, fixing blocks are fixedly connected to the front side and the rear side of the interior of each U-shaped frame, first telescopic rods are fixedly connected to the bottoms of the multiple fixing blocks, and second telescopic rods are fixedly connected to the bottoms of the first telescopic rods. One ends of the multiple first telescopic rods are fixedly connected with corresponding clamping plates, the left end of the top of the inner side of the U-shaped frame is fixedly connected with a second telescopic rod, the right end of the top of the inner side of the U-shaped frame is fixedly connected with a third telescopic rod, and one end of the second telescopic rod and one end of the third telescopic rod are fixedly connected with transverse plates. Sliding grooves are formed in the bottoms of the two transverse plates. According to the paper cutting device, the second telescopic rod and the third telescopic rod drive the transverse plate to adjust the height of the paper cutter, the fourth telescopic rod pushes the sliding block to move the paper cutter left and right in the sliding groove, and paper boxes of different positions and specifications can be accurately cut.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper box cutting technical field especially, relate to a multi -specification custom formula numerical control paper box cutting machine. BACKGROUND

[0002] Traditional manual cutting paper box speed is slow, and paper box cutting machine can complete a large number of cutting tasks in a short time, and a common paper box cutting machine can cut dozens of paper boxes per minute or even hundreds of paper boxes, which can greatly shorten the production time in mass production and meet the order demand.

[0003] Through the retrieval, the utility model belongs to corrugated paper packaging box cutting equipment technical field, especially relates to a multi -specification custom formula numerical control paper box cutting machine, in order to overcome the single specification type of corrugated paper box cutting equipment of prior art, artificial cutting efficiency is slow, and the problem of low yield, the utility model provides a multi -specification custom formula numerical control paper box cutting machine, including paper library frame, cutting equipment frame, paper feeding mechanism, paper pressing mechanism, main transmission mechanism, longitudinal cutting knife mechanism, transverse cutting knife mechanism, transverse cutting knife transmission mechanism, man-machine operation rocker arm electric box, the equipment carries out transverse and longitudinal line pressing, intermittent cutting and cutting processing to corrugated paper, and the fixed cutting can be mass production, and also can be customized production, the machine can be used alone, also can be used in packaging production line on-line, can cut out different specification type paper box, and the degree of automation is high, but in actual use, the equipment can only cut the specified several sizes, the longitudinal cutting knife mechanism and transverse cutting knife mechanism cannot be adjusted at any time, and the distance before the blade can not be replaced according to the production needs, so as to change the production model. UTILITY MODEL CONTENTS

[0004] In order to make up for the above insufficient, the utility model provides a multi -specification custom formula numerical control paper box cutting machine, aims at improving the longitudinal cutting knife mechanism and transverse cutting knife mechanism in prior art cannot be adjusted at any time and cannot change production size according to actual needs.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: A kind of multi-specification custom-made numerical control carton cutting machine, including workbench, the top front and rear side of the workbench is fixedly connected with U-shaped frame, the inside front and rear side of the U-shaped frame is fixedly connected with fixed block, the bottom of multiple fixed blocks is fixedly connected with telescopic rod one, the one end of multiple telescopic rod one is fixedly connected with corresponding clamping plate, the inside top left end of the U-shaped frame is fixedly connected with telescopic rod two, the inside top right end of the U-shaped frame is fixedly connected with telescopic rod three, the one end of telescopic rod two and telescopic rod three is fixedly connected with horizontal plate, the bottom of two horizontal plates is all set with sliding slot, the left and right sides of left sliding slot are fixedly connected with telescopic rod four, the front and rear sides of right sliding slot are fixedly connected with telescopic rod four, the one end of multiple telescopic rod fours is fixedly connected with sliding block, the bottom of multiple sliding blocks is all provided with paper cutter, the top of the workbench is fixedly connected with conveying belt, the bottom of the sliding block is provided with mounting mechanism.

[0006] Through the above technical scheme: first, the conveying belt on the top of workbench is used to transport the carton to be cut, and the carton is stably conveyed to the specified position. The telescopic rod one connected to the fixed block on the inside front and rear side of the U-shaped frame can be extended and retracted, and the clamping plate at the end thereof can be driven by the telescopic rod one to clamp and position the carton in the left-right direction, so as to ensure that the carton does not deviate during cutting. The telescopic rod two at the left end and the telescopic rod three at the right end of the inside top of the U-shaped frame drive the horizontal plate to move up and down, respectively. In the sliding slot opened at the bottom of the horizontal plate, the combination of the telescopic rod four and the sliding block enables the paper cutter to move left and right in the sliding slot to adjust the position. When the carton needs to be cut, first, according to the specifications of the carton, the distance between the clamping plates is adjusted by the telescopic rod one to clamp the carton, then the height of the horizontal plate is adjusted by the telescopic rod two and the telescopic rod three, so that the paper cutter is located at the appropriate cutting height position, and then the sliding block is driven by the telescopic rod four to move the paper cutter left and right in the sliding slot, thereby achieving precise cutting of the carton at different positions and different specifications.

[0007] Further description of the above technical scheme:

[0008] The mounting mechanism includes a plurality of moving slots, a plurality of moving slots are respectively provided in the bottom of the corresponding sliding block, a plurality of moving slots are all slidably connected with a connecting block inside, a plurality of connecting blocks are all provided with a plurality of reserved holes at both ends of one side, a plurality of sliding blocks are all provided with a plurality of limiting holes at equal intervals on one side, and a plurality of sliding blocks are all rotatably connected with a limiting bolt at both ends of one side.

[0009] Through the technical scheme, during installation of the paper cutter, the connecting block is connected with the paper cutter and placed in the moving groove, the connecting block can slide in the moving groove, thereby realizing fine adjustment of the paper cutter within a certain range to adapt to different cutting requirements and changes in carton size, when the connecting block is adjusted to a proper position in the moving groove, the limiting bolt is rotated to pass through the limiting holes at two ends of the sliding block and be inserted into the reserved holes at two ends of the connecting block, so that the connecting block and the sliding block are firmly locked together, thereby fixing the position of the paper cutter

[0010] As a further description of the above technical scheme:

[0011] The front side of the U-shaped frame is fixedly connected with an observation window, and the inside of the observation window is fixedly connected with glass.

[0012] Through the above technical scheme: the observation window is fixed on the front side of the U-shaped frame, and the internal glass can clearly show the operator the cutting process of the carton inside the cutting machine.

[0013] As a further description of the above technical scheme:

[0014] The front side left end of the U-shaped frame is fixedly connected with a switch, and the switch is electrically connected with the telescopic rod one, the telescopic rod two, the telescopic rod three and the telescopic rod four respectively.

[0015] Through the above technical scheme: the switch is fixed on the front side left end of the U-shaped frame, and is electrically connected with the telescopic rod one, the telescopic rod two, the telescopic rod three and the telescopic rod four

[0016] As a further description of the above technical scheme:

[0017] The left side of the workbench is fixedly connected with a feeding port, and a feeding groove is formed in the top of the feeding port.

[0018] Through the above technical scheme: the feeding port is fixed on the left side of the workbench, and the feeding groove on the top provides a channel for the carton to enter the equipment.

[0019] As a further description of the above technical scheme:

[0020] The bottom of the workbench is fixedly connected with a supporting leg, and the bottom of the supporting leg is fixedly connected with a bottom plate.

[0021] Through the above technical scheme: the bottom plate at the bottom increases the contact area with the ground, and the supporting leg and the bottom plate together provide a stable support structure for the entire cutting machine.

[0022] As a further description of the above technical scheme:

[0023] The right side of the workbench is fixedly connected with a collecting frame, and the inside of the collecting frame is fixedly connected with a supporting frame.

[0024] Through the technical scheme, after the carton is cut, the conveying belt conveys the cut carton into the collecting frame.

[0025] Further description of the technical scheme is as follows:

[0026] The inner sides of the two sliding grooves are provided with sliding grooves, and the two ends of the plurality of sliding blocks are fixedly connected with sliding blocks.

[0027] Through the technical scheme, the sliding blocks are slidably connected in the sliding grooves, so that the left and right movement of the sliding blocks in the sliding grooves is more stable and accurate.

[0028] The utility model has the advantages of the following beneficial effects:

[0029] 1、The utility model discloses a conveying belt of workbench conveys carton, realizes the left and right clamping positioning of carton with telescopic rod one and clamping plate on U -shaped support, and telescopic rod two, telescopic rod three drive horizontal plate to adjust the height of paper cutter, and telescopic rod four promotes the left and right movement of sliding block in sliding groove and paper cutter, can accurate cutting of different position and specification carton, guarantee the high efficiency and accuracy of carton cutting operation.

[0030] 2、The utility model discloses a connecting block connected with paper cutter is placed in the moving groove when installing paper cutter, utilizes the characteristic that connecting block can slide in moving groove, realizes the fine adjustment of paper cutter in a certain range to adapt to different cutting demand and carton size change, then through the rotation of limiting bolt, makes it pass through the limiting hole and inserts the reserved hole, locks connecting block and sliding block, the purpose of firm fixed paper cutter position is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A three-dimensional view of a multi-specification customized numerical control carton cutting machine is provided for the utility model;

[0032] Figure 2 A structure side view of a multi-specification customized numerical control carton cutting machine is provided for the utility model;

[0033] Figure 3 A structure sectional view of a multi-specification customized numerical control carton cutting machine is provided for the utility model;

[0034] Figure 4 A structure exploded view of a multi-specification customized numerical control carton cutting machine is provided for the utility model;

[0035] Figure 5 A partial structure schematic view of a multi-specification customized numerical control carton cutting machine is provided for the utility model.

[0036] LEGEND:

[0037] 1, workbench; 2, mounting mechanism; 201, moving groove; 202, connecting block; 203, reserved hole; 204, limiting hole; 205, limiting bolt; 3, U-shaped frame; 4, fixed block; 5, telescopic rod one; 6, clamping plate; 7, telescopic rod two; 8, telescopic rod three; 9, cross plate; 10, sliding groove; 11, sliding block; 12, telescopic rod four; 13, paper cutter; 14, conveyor belt; 15, observation window; 16, glass; 17, switch; 18, feed inlet; 19, feed groove; 20, supporting leg; 21, bottom plate; 22, collection frame; 23, supporting frame; 24, sliding groove; 25, sliding block. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] Reference Figure 1 , Figure 3 and Figure 4The utility model provides a kind of embodiment: a kind of multi-specification custom-made numerical control carton cutting machine, including workbench 1, workbench 1 provides stable placement platform for entire equipment, its top front and rear side is fixedly connected with U-shaped frame 3, U-shaped frame 3 is used to construct the main frame structure of equipment, the inside front and rear side of U-shaped frame 3 is fixedly connected with fixed block 4, fixed block 4 plays the role of connection and support, the bottom of multiple fixed blocks 4 is fixedly connected with telescopic rod one 5, telescopic rod one 5 can realize telescopic motion, the one end of multiple telescopic rod one 5 is fixedly connected with corresponding clamping plate 6, clamping plate 6 can be driven by telescopic rod one 5 and left and right direction clamping positioning is carried out to carton, the inside top left end of U-shaped frame 3 is fixedly connected with telescopic rod two 7, telescopic rod two 7 can control the vertical movement of corresponding component, the inside top right end of U-shaped frame 3 is fixedly connected with telescopic rod three 8, telescopic rod three 8 can also control the vertical displacement of component, the one end of telescopic rod two 7 and telescopic rod three 8 is fixedly connected with transverse plate 9, transverse plate 9 provides installation base for other components, the bottom of two transverse plates 9 is equally provided with sliding slot 10, sliding slot 10 provides track for the movement of other parts, the left and right sides of left side sliding slot 10 are fixedly connected with telescopic rod four 12, telescopic rod four 12 can push relevant component left and right movement, the front and rear side of right side sliding slot 10 is fixedly connected with telescopic rod four 12, the one end of multiple telescopic rod four 12 is fixedly connected with sliding block 11, the bottom of multiple sliding blocks 11 is provided with paper cutter 13, paper cutter 13 is used to cut carton, the top of workbench 1 is fixedly connected with conveyer belt 14, conveyer belt 14 can be delivered to carton specified position, the bottom of sliding block 11 is provided with mounting mechanism 2, mounting mechanism 2 can realize the installation and position fine adjustment of paper cutter 13, the inside both sides of two sliding slots 10 are provided with sliding groove 24, sliding groove 24 provides direction for the movement of sliding block 25, the both ends of multiple sliding blocks 11 are fixedly connected with sliding block 25, sliding block 25 is slidably connected in the inside corresponding sliding groove 24 respectively, so that sliding block 11 moves more stable and accurate, the left side of workbench 1 is fixedly connected with feed inlet 18, feed inlet 18 provides entry for carton into equipment, the top of feed inlet 18 is provided with feed slot 19, feed slot 19 facilitates carton to be placed accurately on conveyer belt 14;

[0040] Specifically, first, the conveyor belt 14 at the top of the workbench 1 is used to transport the cartons to be cut, and the cartons are stably conveyed to the designated position. The telescopic rod one 5 connected to the fixed block 4 on the front and rear sides inside the U-shaped frame 3 can move telescopically, and the clamping plate 6 at the end thereof can be driven by the telescopic rod one 5 to clamp and position the cartons in the left-right direction, so as to ensure that the cartons do not deviate during cutting. The telescopic rod two 7 at the left end of the top inside of the U-shaped frame 3 and the telescopic rod three 8 at the right end drive the horizontal plate 9 to move up and down. The telescopic rod four 12 and the sliding block 11 are combined in the sliding groove 10 at the bottom of the horizontal plate 9, so that the paper cutter 13 can move left and right in the sliding groove 10 to adjust the position. When the carton needs to be cut, first, according to the specifications of the carton, the distance between the clamping plates 6 is adjusted by the telescopic rod one 5 to clamp the carton, and then the height of the horizontal plate 9 is adjusted by the telescopic rod two 7 and the telescopic rod three 8, so that the paper cutter 13 is located at the appropriate cutting height position. Then, the sliding block 11 is driven by the telescopic rod four 12 to move the paper cutter 13 left and right in the sliding groove 10, so as to realize accurate cutting of the carton at different positions and different specifications. The feeding inlet 18 is fixed to the left side of the workbench 1, and the feeding slot 19 at the top provides a passage for the carton to enter the equipment. The sliding block 25 is slidably connected in the sliding groove 24, so that the sliding block 11 moves left and right in the sliding groove 10 more stably and accurately.

[0041] Referring to Figure 2 and Figure 4 , the mounting mechanism 2 includes a plurality of moving grooves 201, which provide space for the sliding of the connecting blocks 202. The plurality of moving grooves 201 are respectively provided at the bottom corresponding to the sliding blocks 11, for determining the installation position of the connecting blocks 202. The plurality of moving grooves 201 are each slidably connected with a connecting block 202, which can move in the moving groove 201 to adjust the position. The plurality of connecting blocks 202 are each provided with a reserved hole 203 at both ends of one side, which is used to cooperate with the limiting bolt 205 to fix the connecting block 202. The plurality of sliding blocks 11 are each provided with a plurality of limiting holes 204 at equal intervals on one side, which provide a passage for the insertion of the limiting bolt 205. The plurality of sliding blocks 11 are each rotatably connected with a limiting bolt 205 at both ends of one side. The limiting bolt 205 realizes the fixation of the connecting block 202 through cooperation with the reserved hole 203 and the limiting hole 204, so as to fix the position of the paper cutter 13 and ensure the stability and accuracy of the paper cutter 13 during work, so that the entire mounting mechanism 2 can flexibly adjust the position of the paper cutter 13 to adapt to different cutting requirements and changes in carton specifications.

[0042] Specifically, during the installation of the paper cutter 13, the connecting block 202 is connected with the paper cutter 13 and placed in the moving groove 201, the connecting block 202 can slide in the moving groove 201, so as to realize the fine adjustment of the paper cutter 13 within a certain range, so as to adapt to different cutting requirements and changes of the carton size, when the connecting block 202 is adjusted to the appropriate position in the moving groove 201, the limiting bolt 205 is rotated to pass through the limiting holes 204 on both ends of one side of the sliding block 11 and is inserted into the reserved holes 203 on both ends of one side of the connecting block 202, so that the connecting block 202 and the sliding block 11 are firmly locked together, and then the position of the paper cutter 13 is fixed.

[0043] With reference to Figure 1 , Figure 3 and Figure 5 , the front side of the U-shaped frame 3 is fixedly connected with an observation window 15, the observation window 15 is convenient for the operator to intuitively view the internal working condition of the equipment, the inside of the observation window 15 is fixedly connected with a glass 16, the glass 16 plays a protective and transparent observation role, the front side of the left end of the U-shaped frame 3 is fixedly connected with a switch 17, the switch 17 serves as an operating part for controlling the action of each telescopic rod of the equipment, the switch 17 is electrically connected with the telescopic rod one 5, the telescopic rod two 7, the telescopic rod three 8 and the telescopic rod four 12 respectively, so as to control the telescopic rod one 5 to realize the clamping and loosening of the carton by the clamping plate 6, control the telescopic rod two 7 and the telescopic rod three 8 to adjust the height of the cross plate 9 and the paper cutter 13, and control the telescopic rod four 12 to drive the sliding block 11 to move the paper cutter 13 left and right, the bottom of the workbench 1 is fixedly connected with a supporting leg 20, the supporting leg 20 provides vertical support force for the workbench 1 and the entire equipment, the bottom of the supporting leg 20 is fixedly connected with a bottom plate 21, the bottom plate 21 increases the contact area with the ground to enhance the stability of the equipment, the right side of the workbench 1 is fixedly connected with a collecting frame 22, the collecting frame 22 is used for collecting the cartons after cutting, the inside of the collecting frame 22 is fixedly connected with a supporting frame 23, the supporting frame 23 can make the collected cartons be more orderly stacked and placed;

[0044] Specifically, the observation window 15 is fixed on the front side of the U-shaped frame 3, the internal glass 16 can clearly show the operator the cutting process of the carton inside the cutting machine, the switch 17 is fixed on the front side of the left end of the U-shaped frame 3 and is electrically connected with the telescopic rod one 5, the telescopic rod two 7, the telescopic rod three 8 and the telescopic rod four 12, the supporting leg 20 is fixed on the bottom of the workbench 1, the bottom plate 21 at the bottom increases the contact area with the ground, the supporting leg 20 and the bottom plate 21 together provide a stable support structure for the entire cutting machine, after the carton is cut, the conveying belt 14 conveys the cut carton into the collecting frame 22.

[0045] Working principle: when using multi-specification customized numerical control paper box cutting machine, first, the conveying belt 14 on the top of the workbench 1 is used to convey the paper box to be cut, and the paper box is conveyed stably to the specified position, the telescopic rod one 5 connected to the fixed block 4 on the inside front and back side of the U-shaped frame 3 can extend and retract, and the clamping plate 6 at the end can be driven by the telescopic rod one 5 to clamp and position the paper box in the left and right directions, so as to ensure that the paper box does not deviate during cutting, the telescopic rod two 7 at the left end and the telescopic rod three 8 at the right end of the inside top of the U-shaped frame 3 drive the horizontal plate 9 to move up and down, the sliding groove 10 is opened at the bottom of the horizontal plate 9, the combination of the telescopic rod four 12 and the sliding block 11 enables the paper cutter 13 to move left and right in the sliding groove 10 to adjust the position, when cutting the paper box, first, according to the size of the paper box, the distance between the clamping plates 6 is adjusted by the telescopic rod one 5 to clamp the paper box, then the height of the horizontal plate 9 is adjusted by the telescopic rod two 7 and the telescopic rod three 8, so that the paper cutter 13 is located at the appropriate cutting height position, and then the sliding block 11 is pushed by the telescopic rod four 12 to drive the paper cutter 13 to move left and right in the sliding groove 10, so as to realize accurate cutting of different positions and different specifications of the paper box, and in the installation process of the paper cutter 13, the connecting block 202 is connected with the paper cutter 13 and placed in the moving groove 201, the connecting block 202 can slide in the moving groove 201, so as to realize the fine adjustment of the paper cutter 13 within a certain range to adapt to different cutting requirements and changes in the size of the paper box, when the connecting block 202 is adjusted to the appropriate position in the moving groove 201, the limiting bolt 205 is rotated to pass through the limiting hole 204 on the side of the sliding block 11 and is inserted into the reserved hole 203 on the side of the connecting block 202, so that the connecting block 202 and the sliding block 11 are firmly locked together, and then the position of the paper cutter 13 is fixed.

[0046] Finally, it should be pointed out that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-specification customized numerical control carton cutting machine comprising a worktable (1), characterized in that: The top of the workbench (1) is fixedly connected with a U-shaped frame (3), the inside of the U-shaped frame (3) is fixedly connected with a fixed block (4), the bottom of the plurality of fixed blocks (4) is fixedly connected with a telescopic rod (5), one end of the plurality of telescopic rods (5) is fixedly connected with a corresponding clamping plate (6), the inside top left end of the U-shaped frame (3) is fixedly connected with a telescopic rod (7), the inside top right end of the U-shaped frame (3) is fixedly connected with a telescopic rod (8), one end of the telescopic rod (7) and the telescopic rod (8) is fixedly connected with a horizontal plate (9), the bottom of the two horizontal plates (9) is provided with a sliding groove (10), the left and right sides of the left sliding groove (10) are fixedly connected with a telescopic rod (12), the front and back sides of the right sliding groove (10) are fixedly connected with a telescopic rod (12), one end of the plurality of telescopic rods (12) is fixedly connected with a sliding block (11), the bottom of the plurality of sliding blocks (11) is provided with a paper cutter (13), the top of the workbench (1) is fixedly connected with a conveyor belt (14), the bottom of the sliding block (11) is provided with a mounting mechanism (2).

2. A multi-gauge custom numerical control carton cutting machine according to claim 1, characterized in that: The mounting mechanism (2) comprises a plurality of moving grooves (201), a plurality of moving grooves (201) are respectively provided in the bottom of the corresponding sliding block (11), the inside of the plurality of moving grooves (201) is slidably connected with a connecting block (202), the two ends of one side of the plurality of connecting blocks (202) are provided with a reserved hole (203), a plurality of limiting holes (204) are equally provided in one side of the plurality of sliding blocks (11), the two ends of one side of the plurality of sliding blocks (11) are rotatably connected with a limiting bolt (205).

3. A multi-gauge custom numerical control carton cutting machine according to claim 1, characterized in that: The front side of the U-shaped frame (3) is fixedly connected with an observation window (15), the inside of the observation window (15) is fixedly connected with a glass (16).

4. The multi-specification customized numerical control carton cutting machine according to claim 1, characterized in that: The front left end of the U-shaped frame (3) is fixedly connected with a switch (17), the switch (17) is electrically connected with the telescopic rod (5), the telescopic rod (7), the telescopic rod (8) and the telescopic rod (12) respectively.

5. A multi-specification customized numerical control carton cutting machine according to claim 1, characterized in that: The left side of the workbench (1) is fixedly connected with a feeding port (18), the top of the feeding port (18) is provided with a feeding groove (19).

6. A multi-specification customized numerical control carton cutting machine according to claim 1, characterized in that: The bottom of the workbench (1) is fixedly connected with a supporting leg (20), the bottom of the supporting leg (20) is fixedly connected with a bottom plate (21).

7. A multi-specification customized numerical control carton cutting machine according to claim 1, characterized in that: The right side of the workbench (1) is fixedly connected with a collecting frame (22), the inside of the collecting frame (22) is fixedly connected with a supporting frame (23).

8. The multi-specification customized numerical control carton cutting machine according to claim 1, characterized in that: The inside of the two sliding grooves (10) is provided with a sliding groove (24), the two ends of the plurality of sliding blocks (11) are fixedly connected with a sliding block (25), the plurality of sliding blocks (25) are slidably connected in the inside of the corresponding sliding groove (24) respectively.

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