CN112982938A

CN112982938A - Scalable regulation formula frame of climbing

Info

Publication number: CN112982938A
Application number: CN202110194780.8A
Authority: CN
Inventors: 梁钊玮; 杨渊; 张绮雯; 邱秋华; 覃祥涛; 谢江美; 孔德辅; 林泰民; 庞绍安; 何碧昕; 孙宝泽; 黄天彦
Original assignee: Guangxi Construction First Construction Engineering Group Co ltd
Current assignee: Guangxi Construction First Construction Engineering Group Co ltd
Priority date: 2021-02-21
Filing date: 2021-02-21
Publication date: 2021-06-18

Abstract

The invention discloses a telescopic adjustable climbing frame which comprises two guide rails fixed on a wall body, wherein the two guide rails are provided with the same lifting plate in a sliding manner, the tops of the two guide rails are fixedly provided with an electric hoist, the bottom end of a steel wire rope on the electric hoist is fixedly connected with the tops of the lifting plates, the front side of each lifting plate is provided with a telescopic box climbing mechanism, each telescopic box climbing mechanism comprises a U-shaped plate fixedly connected with the front side of each lifting plate, two sides of each U-shaped plate are respectively provided with a baffle, and one side, close to each other, of each baffle is fixedly connected with a plurality of stop levers. The telescopic box climbing mechanism is reasonable in design, facilitates telescopic adjustment of the internal width volume of the telescopic box climbing mechanism according to actual needs, facilitates placement of more articles, facilitates reduction of the size of the telescopic box climbing mechanism before installation or after subsequent use, facilitates transportation, improves use flexibility, meets use requirements, and is beneficial to use.

Description

Scalable regulation formula frame of climbing

Technical Field

The invention relates to the technical field of climbing frames, in particular to a telescopic adjustable climbing frame.

Background

The climbing frame is also called a lifting frame and can be divided into several main types such as hydraulic type, electric type, manual pull type and the like according to the power source; it is a new scaffold system developed in recent years, which can climb up or down along buildings, and this system makes scaffold technique completely changed: firstly, the frame does not need to be turned over; and secondly, the dismounting and mounting processes of the scaffold (the scaffold is used till the construction is finished after one-time assembly) are eliminated, and the manpower and the materials are greatly saved.

The frame of climbing that current construction used, by two guide rails of fixing on building wall, slide and set up lifter plate on two guide rails, install the electric block at two guide rail tops and set up the case of climbing in the lifter plate front side and constitute, electric block is used for driving the lifter plate and climbs the lift of case, and during the use, personnel and instrument get into and climb the incasement and can be driven by the lift to required height, need not artifical climbing. But the frame of climbing that current construction used still has some not enoughly, and it climbs the case and has the volumetric shortcoming of the flexible adjustment width of being not convenient for when article are more, need make a round trip to transport from top to bottom many times, and if directly adopt the large tracts of land to climb the case, then cause the transportation in earlier stage and later stage inconvenient easily, can not satisfy the user demand.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a telescopic adjustable climbing frame.

In order to achieve the purpose, the invention adopts the following technical scheme:

a telescopic adjustable climbing frame comprises two guide rails fixed on a wall body, wherein the same lifting plate is slidably mounted on the two guide rails, an electric hoist is fixedly mounted at the tops of the two guide rails, the bottom end of a steel wire rope on the electric hoist is fixedly connected with the tops of the lifting plates, a telescopic box climbing mechanism is arranged on the front side of each lifting plate and comprises a U-shaped plate and two baffle plates, one plate surface of each U-shaped plate is fixedly connected to the front side of each lifting plate, the two baffle plates are arranged on two sides of each U-shaped plate, a plurality of baffle rods are arranged on two side edges of each U-shaped plate, one end of each baffle rod is fixedly connected to each baffle plate, and the other end of; the bottom of the U-shaped plate is provided with a rectangular groove, the inner walls of two sides of the rectangular groove are respectively provided with a rectangular hole, a bottom plate is sleeved in the rectangular hole in a sliding manner, one side, away from the rectangular groove, of the bottom plate extends out of the U-shaped plate, one side, close to the corresponding baffle, of the bottom plate is fixedly connected with the baffle, the bottom of the bottom plate is provided with a limiting groove, the inner wall of the bottom of the rectangular hole is fixedly connected with a limiting block, the limiting block is connected with the corresponding limiting groove in a sliding manner, one sides, close to each other, of the two limiting blocks are respectively rotatably provided with a screw rod, one ends, close to each other, of the two screw rods respectively extend into the rectangular groove and are fixedly connected with a first bevel gear, the two first bevel gears are symmetrically arranged, the inner walls of two sides of the rectangular groove are respectively and fixedly connected with, fixedly connected with left side and bottom are the fender box that the opening set up on the bottom inner wall of U-shaped plate, and fixed mounting has battery and the driving motor who is located to keep off the box on the bottom inner wall of U-shaped plate, driving motor and battery electric connection, and the meshing has same second bevel gear between two first bevel gear, and driving motor's output shaft extends to in the rectangular channel and with second bevel gear's top fixed connection.

As a further improvement of the above technical solution:

the right side fixedly connected with motor wireless remote control switch of battery, and motor wireless remote control switch and battery electric connection, motor wireless remote control switch and driving motor electric connection, motor wireless remote control switch matches and is provided with outside remote controller.

And the inner wall of one side of the limiting groove, which is close to the rectangular groove, is provided with a mounting hole, and the inner wall of the mounting hole is fixedly welded with the outer side of the corresponding nut.

A round hole is formed in the right side of the fixing seat, a first bearing is fixedly sleeved in the round hole, and an inner ring of the first bearing is fixedly sleeved with the outer side of the corresponding screw rod.

One side of the limiting block, which is close to the rectangular groove, is fixedly connected with a second bearing, and the inner ring of the second bearing is fixedly sleeved with the outer side of the corresponding screw rod.

A plurality of circular grooves are formed in the two sides of the U-shaped plate in a rectangular distribution mode, and the inner walls of the circular grooves are connected with the outer sides of the corresponding stop levers in a sliding mode.

The guide rail is T-shaped, the rear side of lifter plate is opened and is equipped with two tops and the T-shaped groove that the bottom was the opening setting, and T-shaped groove and the guide rail sliding connection who corresponds, the branch that two slopes of fixedly connected with set up between the bottom of U-shaped board and the front side of lifter plate.

Two side surfaces of the bottom in the U-shaped plate are provided with sliding chutes, and one ends of the sliding chutes are provided with openings at the side edges of the U-shaped plate; the bottom both sides in the U-shaped board still are equipped with the slide, and this slide includes U type slide and many telescopic links, U type slide includes a side shield and two sliding plates of parallel location side shield both sides, and two sliding plates of U type slide are sliding connection respectively in two spouts that correspond the side, the both ends of many telescopic links are fixed connection respectively on the side shield of U-shaped board and U type slide.

The telescopic link comprises two square tubes that cup joint each other.

One end of the telescopic rod is fixedly connected to the bottom of the side baffle of the U-shaped sliding plate, and a reinforcing piece is further arranged at the connection position; the reinforcing part comprises a plurality of fixed rings which are distributed at intervals in a wavy manner and connecting rods which are fixedly connected between two adjacent fixed rings, the fixed rings are fixedly sleeved at the end parts of the telescopic rods, and the connecting rods are fixedly connected to the bottoms of the side baffles of the U-shaped sliding plates.

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

when more articles need to be adjusted, an external remote controller is used for controlling the wireless remote control switch of the motor to control the driving motor to start in the forward direction, the driving motor drives the second bevel gear to rotate, the second bevel gear drives the two screw rods to rotate in opposite directions through the two first bevel gears, the two screw rods can drive the two nuts to move in directions away from each other by rotation of the two screw rods, the two nuts drive the two bottom plates to move in the directions away from each other in the two rectangular holes, the two bottom plates drive the two baffle plates to move in the directions away from each other, and the baffle plates drive the corresponding six baffle rods to respectively slide in the corresponding circular grooves, distance increase between two baffles this moment realizes the telescopic adjustment telescopic box climbing mechanism width volumetric purpose, when reducing the volume, then reverse start driving motor, and the same reason is totally opposite with forward start driving motor's direction of motion, and two baffles change into the direction removal that is close to each other this moment, realize reducing the volume.

The telescopic box climbing mechanism is reasonable in design, facilitates telescopic adjustment of the internal width volume of the telescopic box climbing mechanism according to actual needs, facilitates multiple people or placement of more articles, and is convenient for reduction of the volume of the telescopic box climbing mechanism before installation or after subsequent use, so that transportation is facilitated, the use flexibility is improved, the use requirements are met, and the telescopic box climbing mechanism is beneficial to use.

Drawings

Fig. 1 is a schematic view of the overall structure of a telescopic adjustable climbing frame;

fig. 2 is a sectional view of the telescopic box climbing mechanism of embodiment 1;

FIG. 3 is an enlarged view of area A in FIG. 2;

FIG. 4 is an enlarged cross-sectional view of area B of FIG. 2;

FIG. 5 is a top view of the telescoping creeper mechanism of FIG. 2;

fig. 6 is a schematic connection diagram of the carriage according to embodiment 2;

FIG. 7 is a schematic structural view of the bottom of the U-shaped plate of FIG. 6;

FIG. 8 is a schematic structural diagram of the carriage in FIG. 6;

fig. 9 is a schematic connection diagram of the carriage according to embodiment 3.

In the figure: 100. a guide rail; 101. a lifting plate; 102. an electric hoist; 103. a strut; 1. a U-shaped plate; 2. a baffle plate; 3. a stop lever; 4. a rectangular groove; 5. a rectangular hole; 6. a base plate; 7. a limiting groove; 8. a limiting block; 9. a screw; 10. a first bevel gear; 11. a fixed seat; 12. a second bevel gear; 13. a drive motor; 14. blocking the box; 15. a wireless remote control switch of the motor; 16. a storage battery; 17. a nut; 18. a circular groove; 19. a chute; 20. a U-shaped slide plate; 21. a telescopic rod; 22. fixing grooves; 23. a reinforcement; 24. a fixing strip; 25. and (4) shoulder forming.

Detailed Description

The present invention will now be described with reference to the accompanying drawings, wherein the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

Referring to fig. 1-5, the scalable regulation formula of embodiment 1 climbs frame, including fixing two guide rails 100 on the wall body, slidable mounting has same lifter plate 101 on two guide rails 100, the top fixed mounting of two guide rails 100 has electric block 102, the top fixed connection of wire rope bottom on electric block 102 and lifter plate 101, the front side of lifter plate 101 is provided with the telescopic case mechanism that climbs, the telescopic case mechanism that climbs includes the U-shaped plate 1 of fixed connection in the front side of lifter plate 101, the both sides of U-shaped plate 1 all are equipped with baffle 2, one side that two baffle 2 are close to each other all is six pin 3 of rectangle fixedly connected with, the slip cap of U-shaped plate 1 is established on six pin 3.

The bottom of the U-shaped plate 1 is provided with a rectangular groove 4, the inner walls of two sides of the rectangular groove 4 are respectively provided with a rectangular hole 5, a bottom plate 6 is sleeved in the rectangular hole 5 in a sliding manner, one side of the bottom plate 6, far away from the rectangular groove 4, extends out of the U-shaped plate 1, one side of the bottom plate 6, close to the corresponding baffle 2, is fixedly connected with the baffle 2, the bottom of the bottom plate 6 is provided with a limiting groove 7, the inner wall of the bottom of the rectangular hole 5 is fixedly connected with a limiting block 8, the limiting block 8 is slidably connected with the corresponding limiting groove 7, the mutually close sides of the two limiting blocks 8 are respectively and rotatably provided with a screw rod 9, the mutually close ends of the two screw rods 9 respectively extend into the rectangular groove 4 and are fixedly connected with a first bevel gear 10, the two first bevel gears 10 are symmetrically arranged, the inner walls of two sides of the rectangular groove 4 are respectively and fixedly connected with a fixing seat 11, the, the screw nuts 17 are sleeved on the corresponding screw rods 9 in a threaded manner, the inner wall of the bottom of the U-shaped plate 1 is fixedly connected with a blocking box 14 with openings at the left side and the bottom, a storage battery 16 and a driving motor 13 which are positioned in the blocking box 14 are fixedly installed on the inner wall of the bottom of the U-shaped plate 1, the driving motor 13 is electrically connected with the storage battery 16, the same second bevel gear 12 is meshed between the two first bevel gears 10, the output shaft of the driving motor 13 extends into the rectangular groove 4 and is fixedly connected with the top of the second bevel gear 12, the telescopic box climbing mechanism is reasonable in design, the internal width volume of the telescopic box climbing mechanism can be conveniently adjusted in a telescopic manner according to actual needs, and more people or more articles can, and the size of the telescopic box climbing mechanism is convenient to reduce before installation or after subsequent use, so that the transportation is convenient, the use flexibility is improved, the use requirement is met, and the use is facilitated.

In the invention, the right side of a storage battery 16 is fixedly connected with a motor wireless remote control switch 15, the motor wireless remote control switch 15 is electrically connected with the storage battery 16, the motor wireless remote control switch 15 is electrically connected with a driving motor 13, the motor wireless remote control switch 15 is matched with an external remote controller, the inner wall of one side of a limiting groove 7 close to a rectangular groove 4 is provided with a mounting hole, the inner wall of the mounting hole is welded and fixed with the outer side of the corresponding nut 17, the right side of the fixed seat 11 is provided with a round hole, a first bearing is fixedly sleeved in the round hole, the inner ring of the first bearing is fixedly sleeved with the outer side of the corresponding screw 9, one side of the limiting block 8 close to the rectangular groove 4 is fixedly connected with a second bearing, and the inner ring of the second bearing is fixedly sleeved with the outer side of the corresponding screw 9, six circular grooves 18 are formed in the two sides of the U-shaped plate 1 in a rectangular shape, and the inner walls of the circular grooves 18 are in sliding connection with the outer sides of the corresponding stop levers 3. The two guide rails 100 are T-shaped guide rails, correspondingly, two T-shaped grooves with the tops and the bottoms being respectively provided with openings are formed in the rear side of the lifting plate 101, the T-shaped grooves are connected with the corresponding guide rails 100 in a sliding mode, and two obliquely arranged supporting rods 103 are fixedly connected between the bottom of the U-shaped plate 1 and the front side of the lifting plate 101.

Referring to fig. 6 to 8, in embodiment 2 of the present invention, a slider is additionally provided. Specifically, two side surfaces of the bottom in the U-shaped plate 1 are provided with sliding grooves 19, and one end of each sliding groove 19 is opened at the side edge of the U-shaped plate 1; the bottom both sides in the U-shaped plate 1 still are equipped with the slide, the slide is including U type slide 20 and many telescopic links 21, and U type slide 20 includes that a side shield and parallel locate two sliding plates of side shield both sides, and two sliding plates of U type slide 20 are sliding connection respectively in two spouts 19 of corresponding side, and the both ends of many telescopic links 21 are fixed connection respectively on the side shield of U-shaped plate 1 and U type slide 20. Through setting up the slide, can be effectively between the slit of U-shaped plate 1 bottom and baffle, through the blocking of U type slide 20 and telescopic link 21, avoided tiny article to drop from the slit.

The telescopic rod 21 is composed of two square tubes which are sleeved with each other. The bottom of the U-shaped plate 1 is provided with fixing grooves 22 with the number equal to that of the telescopic rods 21, and the fixing grooves 22 are square grooves with one ends opened at the side edges of the bottom of the U-shaped plate 1; a square tube of the telescopic rod 21 is fixed in the fixing groove 22 in a matching mode, and the upper surface of the square tube is flush with the upper bottom surface of the U-shaped plate 1. The telescopic rod 21 is designed into a square tube, and the fixing groove 22 is designed into a square groove, so that the bottom of the U-shaped plate 1 can be smooth; meanwhile, when the U-shaped sliding plate 20 of the sliding seat slides, the following movement of the built-in articles is avoided, and the placing of the articles is not influenced.

One end of the telescopic rod 21 is fixedly connected to the bottom of the side baffle of the U-shaped sliding plate 20, and a reinforcing part 23 is further arranged at the connection part; the reinforcement 23 is composed of a plurality of fixing rings distributed at intervals in a wavy shape and a connecting rod fixedly connected between two adjacent fixing rings, the fixing rings are fixedly sleeved on the end part of the telescopic rod 21, and the connecting rod is fixedly connected to the bottom of the side baffle of the U-shaped sliding plate 20. The reinforcing member 23 may be formed by processing the same reinforcing bar and fixedly connected by welding to reinforce the connection strength of the end of the telescopic rod 21.

Referring to fig. 9, in embodiment 3 of the present invention, the sliding base further includes a plurality of fixing strips 24, a flat-top shoulder 25 protrudes from the bottom surface of the sliding slot 19, two sliding plates of the U-shaped sliding plate 20 are slidably connected in the sliding slot 19 on the shoulder 25, the shoulder 25 is provided with a number of grooves equal to the number of the fixing strips 24, the fixing strips 24 are fixedly connected to the tops of all the telescopic rods 21 in a crossing manner, the fixing strips 24 are fixedly inserted in the grooves of the shoulder 25, and the portions of the fixing strips 24 inserted in the grooves are flush with the tops of the shoulder 25. The fixed strip 24 is used for further strengthening the connection strength of the telescopic rod, and when the telescopic rod is used, the two ends of the fixed strip 24 are pressed at the bottom of the U-shaped sliding plate 20, so that the firmness of the telescopic rod during use can be further strengthened.

The working principle of the invention is as follows:

when the electric hoist 102 is used, the lifting plate 101 and the telescopic box climbing mechanism can be driven to lift by the self steel wire rope of the electric hoist 102, when a large number of articles need to be adjusted, the personnel controls the wireless remote control switch 15 of the motor to control the driving motor 13 to be started in the forward direction through an external remote controller, the driving motor 13 drives the second bevel gear 12 to rotate, the second bevel gear 12 drives the two first bevel gears 10 meshed with the second bevel gear to rotate in opposite directions, the two first bevel gears 10 drive the two screw rods 9 to rotate in opposite directions, the two screw rods 9 can drive the two nuts 17 to move in directions away from each other by the rotation of the two screw rods 9, the two nuts 17 drive the two bottom plates 6 to move in directions away from each other in the two rectangular holes 5, the two bottom plates 6 drive the two baffle plates 2 to move in directions away from each other, the baffle plates 2 drive the corresponding six baffle rods 3 to respectively slide in the corresponding circular grooves 18, at the moment, the distance between the two baffle plates 2 is increased, so that the internal width of the telescopic box climbing mechanism is increased, the internal volume of the telescopic box climbing mechanism is increased, more articles can be conveniently placed, and the purpose of telescopically adjusting the width volume is achieved;

when the telescopic case mechanism that climbs is reduced in needs, then reverse start driving motor 13, the direction of motion that starts driving motor 13 with the forward on the same principle is completely opposite, and two baffles 2 change into and remove to the direction that is close to each other this moment, reach and reduce the whole width that telescopic case mechanism that climbs to realize reducing its volume, can reduce the telescopic volume that climbs the case mechanism before making the installation or after the follow-up use, in order to facilitate the transportation.

Claims

1. A telescopic adjustable climbing frame comprises two guide rails (100) fixed on a wall body, a same lifting plate (101) is arranged on the two guide rails (100) in a sliding way, an electric block (102) is fixedly arranged at the top of the two guide rails (100), the bottom end of a steel wire rope on the electric block (102) is fixedly connected with the top of the lifting plate (101), the box climbing device is characterized in that a telescopic box climbing mechanism is arranged on the front side of the lifting plate (101), the telescopic box climbing mechanism comprises a U-shaped plate (1) and two baffle plates (2), one plate surface of the U-shaped plate (1) is fixedly connected to the front side of the lifting plate (101), the two baffle plates (2) are arranged on two sides of the U-shaped plate (1), a plurality of stop rods (3) are arranged on two side edges of two sides of the U-shaped plate (1), one ends of the stop rods (3) are fixedly connected to the baffle plates (2), and the other ends of the stop rods are slidably sleeved with the U-shaped plate (1); the bottom of the U-shaped plate (1) is provided with a rectangular groove (4), the inner walls of two sides of the rectangular groove (4) are respectively provided with a rectangular hole (5), a bottom plate (6) is sleeved in the rectangular hole (5) in a sliding manner, one side, far away from the rectangular groove (4), of the bottom plate (6) extends out of the U-shaped plate (1), one side, close to the corresponding baffle (2), of the bottom plate (6) is fixedly connected with the baffle (2), the bottom of the bottom plate (6) is provided with a limiting groove (7), the inner wall of the bottom of the rectangular hole (5) is fixedly connected with a limiting block (8), the limiting block (8) is in sliding connection with the corresponding limiting groove (7), one side, close to each other, of the two limiting blocks (8) is rotatably provided with a screw rod (9), one end, close to each other, of the two screw rods (9) extends into the rectangular groove (4) and is fixedly connected, the inner walls of the two sides of the rectangular groove (4) are fixedly connected with fixing seats (11), the fixing seats (11) are rotatably sleeved on the corresponding screw rods (9), the inner walls of the two limiting grooves (7) at the sides close to each other are embedded with nuts (17), and nut (17) threaded sleeve establishes on corresponding screw rod (9), fixedly connected with left side and bottom are fender box (14) that the opening set up on the bottom inner wall of U-shaped plate (1), fixed mounting has battery (16) and driving motor (13) that are located fender box (14) on the bottom inner wall of U-shaped plate (1), driving motor (13) and battery (16) electric connection, the meshing has same second bevel gear (12) between two first bevel gear (10), the output shaft of driving motor (13) extend to in rectangular channel (4) and with the top fixed connection of second bevel gear (12).

2. The telescopic adjustable climbing frame according to claim 1, wherein a motor wireless remote control switch (15) is fixedly connected to the right side of the storage battery (16), the motor wireless remote control switch (15) is electrically connected with the driving motor (13), and an external remote controller is arranged on the motor wireless remote control switch (15) in a matching manner.

3. The telescopic adjustable climbing frame as claimed in claim 1, wherein the inner wall of the limiting groove (7) close to the rectangular groove (4) is provided with a mounting hole, and the inner wall of the mounting hole is welded and fixed with the outer side of the corresponding nut (17).

4. The telescopic adjustable climbing frame as claimed in claim 1, wherein a circular hole is formed in the right side of the fixed base (11), a first bearing is fixedly sleeved in the circular hole, and an inner ring of the first bearing is fixedly sleeved on the outer side of the corresponding screw (9).

5. The telescopic adjustable climbing frame according to claim 1, wherein a second bearing is fixedly connected to one side of the limiting block (8) close to the rectangular groove (4), and an inner ring of the second bearing is fixedly sleeved with an outer side of the corresponding screw rod (9).

6. The adjustable telescopic climbing frame according to claim 1, wherein the U-shaped plate (1) has a plurality of circular grooves (18) on both sides thereof in a rectangular distribution, and the inner walls of the circular grooves (18) are slidably connected to the outer sides of the corresponding stop rods (3).

7. The adjustable telescopic climbing frame according to claim 1, wherein the guide rail (100) is a T-shaped guide rail, two T-shaped grooves with open top and bottom are opened at the rear side of the lifting plate (101), the T-shaped grooves are slidably connected with the corresponding guide rail (100), and two obliquely arranged struts (103) are fixedly connected between the bottom of the U-shaped plate (1) and the front side of the lifting plate (101).

8. The telescopic adjustable climbing frame according to claim 1, wherein sliding grooves (19) are formed in two side surfaces of the inner bottom of the U-shaped plate (1), and one end of each sliding groove (19) is opened at the side edge of the U-shaped plate (1); the bottom both sides in U-shaped plate (1) still are equipped with the slide, and this slide includes U type slide (20) and many telescopic links (21), U type slide (20) include a side shield and the parallel two sliding plates of locating the side shield both sides, and two sliding plates of U type slide (20) are sliding connection respectively in two spout (19) of corresponding side, the both ends of many telescopic links (21) are fixed connection respectively on the side shield of U-shaped plate (1) and U type slide (20).

9. The adjustable telescopic climbing frame according to claim 8, wherein the telescopic rod (21) is composed of two square tubes which are sleeved with each other.

10. The adjustable telescopic climbing frame according to claim 8 or 9, wherein one end of the telescopic rod (21) is fixedly connected to the bottom of the side baffle of the U-shaped sliding plate (20), and a reinforcing member (23) is further arranged at the connection position; the reinforcing piece (23) is composed of a plurality of fixing rings which are distributed at intervals in a wavy mode and connecting rods which are fixedly connected between every two adjacent fixing rings, the fixing rings are fixedly sleeved on the end portions of the telescopic rods (21), and the connecting rods are fixedly connected to the bottoms of the side baffles of the U-shaped sliding plates (20).