Bottle clamping device of bottled water equipment

Abstract

The utility model relates to the technical field of bottle clamping devices, in particular to a bottle clamping device of bottled water equipment, which adopts a single side plate structure, is smaller in structural volume, can clamp bottles with different sizes, and is good in universality. Comprising a mechanical arm, a side plate and a hydraulic cylinder, the side plate is hinged to the end of the mechanical arm, one end of the hydraulic cylinder is rotationally connected with the mechanical arm, and the other end of the hydraulic cylinder is rotationally connected with the side plate; the side edge of the side plate is provided with the multiple clamping notches, the sliding rail is installed on the side plate, the sliding rail is parallel to the arrangement direction of the multiple clamping notches, the sliding plate is installed on the sliding rail in a sliding mode through the multiple sliding blocks, the multiple clamping rods are arranged on the sliding plate, and the hydraulic push rod is arranged on the sliding plate. The multiple clamping rods are located on the right sides of the multiple clamping notches correspondingly, the hydraulic push rod is installed on the side plate, and a piston rod of the hydraulic push rod is connected with the sliding plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bottle clamping device, in particular to a bottle clamping device of bottled water equipment. BACKGROUND

[0002] Bottled water equipment needs bottle clamping device to clamp bottles when carrying out filling work, and carries bottles, and the prior art No. The bottle clamping device is provided with pivotable first gear and second gear that are intermeshed on the opposite faces of the oppositely arranged first side plate and second side plate, the opposite faces of the two first gears are each provided with a first connecting member, the opposite faces of the two second gears are each provided with a second connecting member, the two first connecting members are connected by a first clamping plate, the two second connecting members are connected by a second clamping plate, a cylinder is further arranged on the first side plate, the piston rod of the cylinder is hingedly connected with the first connecting member, the first clamping plate is driven to swing by the piston rod driving the first connecting member to swing through the extension and retraction action of the piston rod, when the first connecting member swings, the second connecting member is affected by the meshing action of the first and second gears to drive the second clamping plate to swing, that is, the extension and retraction action of the piston rod can drive the first clamping plate and the second clamping plate to swing between the abutting and separating positions, the first clamping plate and the second clamping plate are provided with a plurality of semicircular holes, when the first clamping plate and the second clamping plate abut, the two opposite semicircular holes form a complete circular hole, the circular hole is matched with the bottle neck of the clamped bottle, and a plurality of circular holes represent that a plurality of bottle necks can be clamped at the same time to achieve the effect of clamping a plurality of bottles at one time, and the problem of high cost of bottled water automatic production line is reduced.

[0003] However, the above-mentioned bottle clamping device uses two side plates to clamp the bottle by relative rotation, the structure is large in size and heavy, and the circular holes on the two side plates for clamping the bottle neck are fixed in size, which cannot be applied to bottle necks of different sizes and has poor universality. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a bottle clamping device of bottled water equipment which adopts a single side plate structure, is smaller in structure size, can clamp bottles of different sizes, and has good universality.

[0005] The utility model discloses a bottle clamping device for bottling water equipment, comprising a mechanical arm, a side plate and a hydraulic cylinder, the side plate is hinged to the end of the mechanical arm, one end of the hydraulic cylinder is rotatably connected to the mechanical arm, and the other end of the hydraulic cylinder is rotatably connected to the side plate; it also comprises a plurality of clamping slots, a slide rail, a sliding plate, a plurality of clamping rods and a hydraulic push rod, a plurality of clamping slots are arranged on the side of the side plate, the slide rail is mounted on the side plate, the slide rail is parallel to the arrangement direction of the plurality of clamping slots, the sliding plate is slidably mounted on the slide rail through a plurality of sliders, a plurality of clamping rods are arranged on the sliding plate, the plurality of clamping rods are respectively located on the right side of the plurality of clamping slots, the hydraulic push rod is mounted on the side plate, and the piston rod of the hydraulic push rod is connected to the sliding plate; the diameter of the plurality of clamping slots is larger than the diameter of the commonly used bottle neck, and when clamping the bottle, the hydraulic cylinder drives the side plate to rotate relative to the mechanical arm. The movement causes the multiple clamping slots to be respectively sleeved on the necks of the multiple bottles, and the piston rod of the hydraulic push rod contracts to pull the sliding plate to move along the slide rail, so that the multiple clamping rods move toward the inner sides of the multiple clamping slots respectively, so that the multiple clamping rods cooperate with the side walls of the multiple clamping slots to clamp the necks of the multiple bottles respectively, the hydraulic cylinder drives the side plate to move, and at the same time the mechanical arm moves to transport the multiple bottles to the next workstation, and the piston rod of the hydraulic push rod extends to push the sliding plate to move along the slide rail, so that the multiple clamping rods move toward the outer sides of the multiple clamping slots respectively, to release the multiple bottles. Compared with the existing technology, the single-side plate structure is adopted, the structural volume is smaller and more flexible. Since the diameter of the multiple clamping slots is larger than the diameter of the bottle necks, the multiple clamping rods cooperate with the multiple clamping slots to clamp bottles of different sizes, and have good versatility.

[0006] Preferably, it further includes multiple buffer pads 1 and multiple buffer pads 2, and the buffer pads 1 are provided on the side walls opposite to the multiple clamping slots and the multiple clamping rods, and the buffer pads 2 are provided on the side walls opposite to the multiple clamping rods and the multiple clamping slots; when the multiple clamping slots and the multiple clamping rods clamp the bottle neck, the multiple buffer pads 1 and the multiple buffer pads 2 are placed between the bottle neck and the multiple clamping slots and the multiple clamping rods to prevent the bottle from being clamped and improve reliability.

[0007] Preferably, it also includes multiple transverse limiting rods and multiple limiting protrusions, multiple clamping rods and the multiple holding slots are provided with multiple inward transverse limiting rods at the outer ends of the side walls opposite to the multiple clamping rods, and multiple holding slots and the multiple clamping rods are provided with inward limiting protrusions at the openings of the side walls opposite to the multiple clamping rods; when the multiple clamping rods cooperate with the multiple holding slots to clamp the bottle neck, the multiple limiting protrusions and the multiple transverse limiting rods are relatively close to close the openings of the holding slots, thereby preventing the clamped bottles from detaching and improving the reliability of clamping.

[0008] Preferably, the plurality of bottle pushing plates are provided on the side of the plurality of clamping rods away from the plurality of clamping slots, and the plurality of bottle pushing plates are triangular; when the plurality of bottles clamped need to be released, the piston rod of the hydraulic push rod is elongated to push the sliding plate along the sliding rail, so that the plurality of clamping rods release the bottles away from the opposite plurality of clamping slots, and the plurality of clamping rods drive the plurality of bottle pushing plates into the plurality of clamping slots on the back side, so that the plurality of bottle pushing plates push the bottle necks in the plurality of clamping slots out of the plurality of clamping slots, thereby improving the reliability of bottle release.

[0009] Preferably, the plurality of buffer pads three are provided on the side wall of the plurality of clamping slots; by installing the plurality of buffer pads three on the plurality of bottle pushing plates, the wear on the bottles is reduced.

[0010] Preferably, the lower sliding rail, the plurality of sliding blocks, the plurality of clamping slot plates, the variable pitch screw rod and the stepping motor are further included; a fixed clamping slot is provided at the right end of the side plate, the lower sliding rail is installed on the lower end face of the side plate, the plurality of sliding blocks are slidingly installed on the lower sliding rail, the plurality of clamping slot plates are installed on the plurality of sliding blocks, the plurality of clamping slot plates are located on the left side of the fixed clamping slot, the plurality of clamping slot plates are provided with clamping slots, the variable pitch screw rod is rotatably installed on the lower end face of the side plate, the stepping motor is installed on the lower end face of the side plate, the output shaft of the stepping motor is in transmission connection with the variable pitch screw rod, the variable pitch screw rod is provided with a plurality of threads with different pitches, the plurality of threads of the variable pitch screw rod gradually decrease towards the fixed clamping slot, and the plurality of sliding blocks are respectively in transmission connection with the plurality of threads with different pitches of the variable pitch screw rod through corresponding screw nuts; the stepping motor drives the variable pitch screw rod to rotate, the variable pitch screw rod drives the plurality of sliding blocks to move towards or away from the fixed clamping slot through the plurality of threads with different pitches and corresponding screw nuts, and the plurality of sliding blocks move at different speeds through the plurality of threads with different pitches of the variable pitch screw rod, so that the sliding blocks away from the fixed clamping slot move at a greater speed, thereby keeping the spacing between the plurality of clamping slots uniform, thereby adapting to bottles of different sizes and having good versatility.

[0011] Preferably, the two edge guide plates, the plurality of middle guide plates and the plurality of bolts are further included; the two edge guide plates are respectively located on the left and right outer sides of the plurality of clamping slots, the plurality of middle guide plates are respectively located between the plurality of clamping slots, the plurality of edge guide plates and the plurality of middle guide plates are all towards the outer side of the side plate, and the two edge guide plates and the plurality of middle guide plates are respectively installed on the lower end face of the side plate and the plurality of sliding blocks through the plurality of bolts; the two edge guide plates and the plurality of middle guide plates arrange and separate the plurality of bottles, so that the necks of the plurality of bottles are respectively aligned with the plurality of clamping slots, thereby facilitating efficient clamping of the bottles.

[0012] Compared with the prior art, the beneficial effects of the utility model are that: unilateral plate structure is adopted, the structure volume is smaller, and it is more flexible, because the caliber of the plurality of clamping slots is larger than the diameter of the bottle neck, so the plurality of clamping rods and the plurality of clamping slots can clamp bottles of different sizes, and the versatility is good. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the overhead structural schematic diagram of the utility model;

[0015] Figure 3 It is the structural schematic diagram of the utility model in the exploded state;

[0016] Figure 4 It is the structural schematic diagram of the structure such as sliding plate, clamping rod, hydraulic push rod, buffer pad two, horizontal limiting rod and bottle pushing plate;

[0017] Figure 5 It is the bottom view isometric structural schematic diagram of the utility model;

[0018] Figure 6 It is the structural schematic diagram of the structure such as sliding block, clamping slot plate, variable pitch screw rod and step motor.

[0019] Mark in the drawing: 1, mechanical arm; 2, side plate; 3, hydraulic cylinder; 4, clamping slot; 5, slide rail; 6, sliding plate; 7, clamping rod; 8, hydraulic push rod; 9, buffer pad one; 10, buffer pad two; 11, horizontal limiting rod; 12, limiting lug; 13, bottle pushing plate; 14, buffer pad three; 15, lower slide rail; 16, sliding block; 17, clamping slot plate; 18, variable pitch screw rod; 19, step motor; 20, side guide plate; 21, middle guide plate; 22, bolt. DETAILED DESCRIPTION

[0020] In order to facilitate understanding of the utility model, the utility model will be described more comprehensively below with reference to relevant drawings. The utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Embodiment 1

[0022] As Figures 1 to 4As shown, a bottle clamping device of a bottled water equipment includes a mechanical arm 1, a side plate 2 hinged to the end of the mechanical arm 1, and a hydraulic cylinder 3 rotatably connected to the mechanical arm 1 at one end and rotatably connected to the side plate 2 at the other end; further includes a plurality of clamping notches 4 provided on the side edge of the side plate 2, a sliding rail 5 installed on the side plate 2, the sliding rail 5 being parallel to the arrangement direction of the plurality of clamping notches 4, a sliding plate 6 slidably installed on the sliding rail 5 through a plurality of sliding blocks, a plurality of clamping rods 7 provided on the sliding plate 6, the plurality of clamping rods 7 being respectively located on the right side of the plurality of clamping notches 4, and a hydraulic push rod 8 installed on the side plate 2, the piston rod of the hydraulic push rod 8 being connected to the sliding plate 6; further includes a plurality of buffer pads I 9 and a plurality of buffer pads II 10, the opposite side walls of the plurality of clamping notches 4 and the plurality of clamping rods 7 are respectively provided with the buffer pads I 9 and the buffer pads II 10; further includes a plurality of horizontal limiting rods 11 and a plurality of limiting protrusions 12, the outer ends of the opposite side walls of the plurality of clamping notches 4 and the plurality of clamping rods 7 are respectively provided with the plurality of horizontal limiting rods 11 inward, and the openings of the opposite side walls of the plurality of clamping notches 4 and the plurality of clamping rods 7 are respectively provided with the limiting protrusions 12 inward.

[0023] The diameters of the plurality of clamping notches 4 are greater than the diameters of the necks of common bottles, when clamping the bottles, the hydraulic cylinder 3 drives the side plate 2 to rotate relative to the mechanical arm 1, so that the plurality of clamping notches 4 are respectively sleeved on the necks of the plurality of bottles, the piston rod of the hydraulic push rod 8 is retracted to pull the sliding plate 6 to move along the sliding rail 5, so that the plurality of clamping rods 7 respectively move to the inner sides of the plurality of clamping notches 4, so that the plurality of clamping rods 7 clamp the necks of the plurality of bottles in cooperation with the side walls of the plurality of clamping notches 4, the plurality of buffer pads I 9 and the plurality of buffer pads II 10 are arranged between the necks of the bottles and the plurality of clamping notches 4 and the plurality of clamping rods 7, so as to avoid the bottles from being clamped and damaged, the plurality of limiting protrusions 12 and the plurality of horizontal limiting rods 11 are relatively close to each other to close the openings of the clamping notches 4, so as to avoid the clamped bottles from being separated, the hydraulic cylinder 3 drives the side plate 2 to act, and at the same time, the mechanical arm 1 acts to transfer the plurality of bottles to the next station, the piston rod of the hydraulic push rod 8 is elongated to push the sliding plate 6 to move along the sliding rail 5, so that the plurality of clamping rods 7 respectively move to the outer sides of the plurality of clamping notches 4 to release the plurality of bottles, compared with the prior art, the single side plate structure is adopted, the structure volume is smaller, and it is more flexible, because the diameters of the plurality of clamping notches 4 are greater than the diameters of the bottle necks, the plurality of clamping rods 7 can clamp bottles of different sizes in cooperation with the plurality of clamping notches 4, and the universality is good.

[0024] Embodiment 2

[0025] As Figure 3 and Figure 4As shown in the embodiment 1, on the basis of the embodiment 1, further comprising a plurality of bottle pushing plates 13, the plurality of clamping rods 7 away from the side of the plurality of clamping slots 4 are provided with the bottle pushing plates 13, and the plurality of bottle pushing plates 13 are triangular; further comprising a plurality of buffer pads three 14, the side wall of the plurality of bottle pushing plates 13 towards the plurality of clamping slots 4 are provided with the buffer pads three 14.

[0026] When the plurality of clamped bottles need to be released, the piston rod of the hydraulic push rod 8 is elongated to push the sliding plate 6 along the sliding rail 5, so that the plurality of clamping rods 7 release the bottles away from the opposite plurality of clamping slots 4, and the plurality of clamping rods 7 drive the plurality of bottle pushing plates 13 into the plurality of clamping slots 4 behind the plurality of bottle pushing plates 13, so that the plurality of bottle pushing plates 13 push the bottle necks in the plurality of clamping slots 4 out of the plurality of clamping slots 4, improving the reliability of bottle release, and reducing the wear on the bottles by installing the plurality of buffer pads three 14 on the plurality of bottle pushing plates 13.

[0027] Embodiment 3

[0028] As shown in the embodiment 1, on the basis of the embodiment 1, further comprising a plurality of bottle pushing plates 13, the plurality of clamping rods 7 away from the side of the plurality of clamping slots 4 are provided with the bottle pushing plates 13, and the plurality of bottle pushing plates 13 are triangular; further comprising a plurality of buffer pads three 14, the side wall of the plurality of bottle pushing plates 13 towards the plurality of clamping slots 4 are provided with the buffer pads three 14. Figure 3 、 Figure 5 and Figure 6 As shown in the embodiment 1, on the basis of the embodiment 1, further comprising a plurality of bottle pushing plates 13, the plurality of clamping rods 7 away from the side of the plurality of clamping slots 4 are provided with the bottle pushing plates 13, and the plurality of bottle pushing plates 13 are triangular; further comprising a plurality of buffer pads three 14, the side wall of the plurality of bottle pushing plates 13 towards the plurality of clamping slots 4 are provided with the buffer pads three 14.

[0029] The stepping motor 19 drives the variable pitch screw rod 18 to rotate, the variable pitch screw rod 18 drives a plurality of sliding blocks 16 to move towards or away from the fixed clamping slot 4 along the lower slide rail 15 through a plurality of threads with different pitches and the corresponding screw nuts, and the moving speed of the plurality of sliding blocks 16 is different through the plurality of threads with different pitches of the variable pitch screw rod 18, the moving speed of the sliding block 16 away from the fixed clamping slot 4 is greater, so that the spacing between the plurality of clamping slots 4 is kept uniform, thereby adapting to bottles with different bottle body sizes, when the side plate 2 approaches the plurality of bottles, the two edge guide plates 20 and the plurality of middle guide plates 21 arrange and separate the plurality of bottles, so that the necks of the plurality of bottles are aligned with the plurality of clamping slots 4 respectively, and the bottle is clamped conveniently and efficiently.

[0030] As Figures 1 to 6 shown, the bottle clamping device of the bottled water equipment in the utility model, when working, first, the stepping motor 19 runs and drives a plurality of sliding blocks 16 to move, adapts to the bottle body of the bottle, then when clamping the bottle, the hydraulic cylinder 3 drives the side plate 2 to rotate relative to the mechanical arm 1, so that the side plate 2 approaches the plurality of bottles, the two edge guide plates 20 and the plurality of middle guide plates 21 arrange and place the bottle body, so that the plurality of clamping slots 4 are respectively sleeved to the necks of the plurality of bottles, then the piston rod of the hydraulic push rod 8 retracts and pulls the sliding plate 6 to move along the slide rail 5, so that the plurality of clamping rods 7 move to the inside of the plurality of clamping slots 4 respectively, so that the plurality of clamping rods 7 clamp the necks of the plurality of bottles in cooperation with the side walls of the plurality of clamping slots 4, the hydraulic cylinder 3 drives the side plate 2 to act, and the mechanical arm 1 acts and transfers the plurality of bottles to the next station, finally, the piston rod of the hydraulic push rod 8 extends and pushes the sliding plate 6 to move along the slide rail 5, so that the plurality of clamping rods 7 move to the outside of the plurality of clamping slots 4 respectively, the plurality of clamping rods 7 drive the plurality of bottle pushing plates 13 to enter the plurality of clamping slots 4 at the back side, so that the plurality of bottle pushing plates 13 push the necks of the bottles in the plurality of clamping slots 4 out of the plurality of clamping slots 4, and the plurality of bottles are released.

[0031] The main functions realized by the utility model are:

[0032] 1. The single side plate structure is adopted, the structure volume is smaller, and it is more flexible;

[0033] 2. Since the caliber of the plurality of clamping slots 4 is larger than the diameter of the necks of the bottles, the plurality of clamping rods 7 and the plurality of clamping slots 4 can clamp bottles of different sizes, and the universality is good;

[0034] 3. The spacing of the plurality of clamping slots 4 can be adjusted, and bottles with different bottle body sizes are adapted, and the universality is good.

[0035] The bottle clamping device of the bottled water equipment is provided with a hydraulic cylinder 3, a mechanical arm 1, a side plate 2, a sliding rail 5, a hydraulic push rod 8, a buffer pad one 9, a buffer pad two 10, a buffer pad three 14, a lower sliding rail 15, a sliding block 16, a variable pitch screw rod 18, a stepping motor 19 and a bolt 22, and the installation mode, the connection mode or the setting mode of the bottle clamping device is a common mechanical mode, and the bottle clamping device can be implemented as long as the beneficial effects can be achieved.

[0036] All the technical and scientific terms used in the present application have the same meaning as that commonly understood by the technical personnel belonging to the technical field of the present application. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items.

[0037] The above is only the preferred embodiment of the present application, and it should be pointed out that for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A bottle clamping device for bottled water equipment, comprising a mechanical arm (1), a side plate (2) and a hydraulic cylinder (3), wherein the side plate (2) is hinged to the end of the mechanical arm (1), one end of the hydraulic cylinder (3) is rotatably connected to the mechanical arm (1), and the other end of the hydraulic cylinder (3) is rotatably connected to the side plate (2); characterized in that: The invention also includes a plurality of holding slots (4), a slide rail (5), a sliding plate (6), a plurality of clamping rods (7) and a hydraulic push rod (8). The side of the side plate (2) is provided with a plurality of holding slots (4). The slide rail (5) is installed on the side plate (2). The slide rail (5) is parallel to the arrangement direction of the plurality of holding slots (4). The sliding plate (6) is slidably installed on the slide rail (5) through a plurality of sliders. The sliding plate (6) is provided with a plurality of clamping rods (7). The plurality of clamping rods (7) are respectively located on the right side of the plurality of holding slots (4). The hydraulic push rod (8) is installed on the side plate (2). The piston rod of the hydraulic push rod (8) is connected to the sliding plate (6).

2. The bottle clamping device for bottled water equipment according to claim 1, characterized in that: It also includes a plurality of buffer pads 1 (9) and a plurality of buffer pads 2 (10), wherein the buffer pads 1 (9) are provided on the side walls opposite to the plurality of clamping slots (4) and the plurality of clamping rods (7), and the buffer pads 2 (10) are provided on the side walls opposite to the plurality of clamping rods (7) and the plurality of clamping slots (4).

3. The bottle clamping device for bottled water equipment according to claim 1, characterized in that: It also includes a plurality of transverse limiting rods (11) and a plurality of limiting protrusions (12), wherein the outer ends of the side walls opposite to the plurality of clamping rods (7) and the plurality of clamping slots (4) are provided with a plurality of inward transverse limiting rods (11), and the openings of the side walls opposite to the plurality of clamping slots (4) and the plurality of clamping rods (7) are provided with a plurality of inward limiting protrusions (12).

4. The bottle clamping device for bottled water equipment according to claim 1, characterized in that: It also includes a plurality of bottle pushing plates (13), each of which is provided on one side of the plurality of clamping rods (7) away from the plurality of clamping notches (4), and each of the plurality of bottle pushing plates (13) is triangular in shape.

5. The bottle clamping device for bottled water equipment according to claim 4, characterized in that: It also includes a plurality of buffer pads three (14), and the buffer pads three (14) are all provided on the side walls of the plurality of bottle pushing plates (13) facing the plurality of clamping notches (4).

6. The bottle clamping device for bottled water equipment according to claim 1, characterized in that: The invention also includes a lower rail (15), a plurality of sliding blocks (16), a plurality of clamping slot plates (17), a pitch-variable screw rod (18) and a stepping motor (19). A fixed clamping slot (4) is provided at the right end of the side plate (2). The lower rail (15) is mounted on the lower end surface of the side plate (2). The plurality of sliding blocks (16) are slidably mounted on the lower rail (15). The clamping slot plates (17) are all mounted on the plurality of sliding blocks (16). The plurality of clamping slot plates (17) are located on the left side of the fixed clamping slot (4). The plurality of clamping slot plates (17) are all mounted on the plurality of A holding notch (4) is provided, a pitch-variable screw (18) is rotatably mounted on the lower end surface of the side plate (2), a stepper motor (19) is mounted on the lower end surface of the side plate (2), an output shaft of the stepper motor (19) is transmission-connected with the pitch-variable screw (18), a plurality of sections of threads with different pitches are provided on the pitch-variable screw (18), and the plurality of sections of threads of the pitch-variable screw (18) are gradually reduced toward the fixed holding notch (4), and a plurality of sliding blocks (16) are transmission-connected with the plurality of sections of threads with different pitches of the pitch-variable screw (18) through corresponding screw nuts.

7. The bottle clamping device for bottled water equipment according to claim 6, characterized in that: The utility model further comprises two side guide plates (20), a plurality of middle guide plates (21) and a plurality of bolts (22), wherein the two side guide plates (20) are respectively located on the left and right outer sides of the plurality of clamping slots (4), and the plurality of middle guide plates (21) are respectively located between the plurality of clamping slots (4), and the plurality of side guide plates (20) and the plurality of middle guide plates (21) are all oriented toward the outer sides of the side plates (2), and the two side guide plates (20) and the plurality of middle guide plates (21) are respectively mounted on the lower end surfaces of the side plates (2) and the plurality of sliding blocks (16) by means of a plurality of bolts (22).

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