CN114712760A

CN114712760A - Fire hose reel for indoor fire hydrant

Info

Publication number: CN114712760A
Application number: CN202210423262.3A
Authority: CN
Inventors: 叶毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-07-08

Abstract

The invention relates to the field of fire fighting equipment, and discloses a fire hose reel for an indoor fire hydrant, which comprises a fire hydrant arranged in a wall body, wherein a fire hydrant is arranged at one corner of the bottom of an inner cavity of the fire hydrant, a water delivery hose is communicated with the fire hydrant, a positioning shaft is fixedly sleeved between the inner walls of two sides of the fire hydrant, the positioning shaft is close to one side of an opening of the fire hydrant, and a supporting plate capable of being turned out of the fire hydrant is movably sleeved in the middle of the positioning shaft. Through the outside backup pad of upset play fire hose, hose reel structural design, utilize the limiting plate, prop up the support plate, spacing fulcrum shaft forms triangle-shaped and supports, make the backup pad, the hose reel keeps the horizontality, and then ensure that water can spout out the operation of putting out a fire steadily, the effectual current fire hose reel of having avoided with support its rotatory bearing, the consumption of wearing and tearing easily, influence the rotatory release of fire hose reel when leading to water or rolling fire hose, and then influence the efficiency problem of water spray fire control operation.

Description

Fire hose reel for indoor fire hydrant

Technical Field

The invention relates to the field of fire fighting equipment, in particular to a fire fighting hose reel for an indoor fire hydrant.

Background

The fire hose reel is installed in an indoor fire hydrant box and comprises a valve, an input pipeline, a spoke, a supporting frame, a rocker arm, a hose, a spray gun and other parts, water is used as a fire extinguishing agent, a fire extinguisher capable of spraying the fire extinguishing agent in the process of rapidly unfolding the hose can be used without installing a spray head and connecting a water pipe, when a fire disaster is coped with, the fire hydrant box is directly opened, the valve of the fire hydrant is opened, then the fire hydrant is dragged to a fire catching position by the reel, and a water outlet valve of the reel is opened, so that the fire extinguishing effect can be achieved, and the emergency operation efficiency is high.

However, because the hose reel on the present fire hose reel supports through back shaft and the bearing of installing on the fire hydrant box door body, this makes the fire hose reel when using, because of letting in of the continuation of high pressure water, and the self weight of fire hose reel is great, lead to supporting position wearing and tearing to consume easily, influence the hose reel and receive and release the hose, and then influence the problem of the operation of putting out a fire, and, when conventional fire hose reel adopted the level to place, the hose reel was when rolling fire hose, the hose was concentrated and is twined in the lower half of hose reel, influence the problem that follow-up hose continued rolling work.

Disclosure of Invention

The invention provides a fire hose reel for an indoor fire hydrant, which has the advantages that a supporting part is not easy to wear and consume, and the fire hose is convenient to uniformly roll, and solves the technical problems in the background technology.

In order to realize the purpose, the invention provides the following technical scheme to realize the purpose: a fire hose reel for an indoor fire hydrant comprises a fire hydrant installed in a wall body, a fire hydrant is arranged at one corner of the bottom of an inner cavity of the fire hydrant, a water delivery hose is communicated on the fire hydrant, a positioning shaft is fixedly sleeved between inner walls of two sides of the fire hydrant and is close to one side of an opening of the fire hydrant, a supporting plate capable of turning out the outside of the fire hydrant is movably sleeved in the middle of the positioning shaft, a rotatable hose reel is supported at the top of the supporting plate, a hollow rotating shaft is fixedly sleeved between two disks of the hose reel, a pipe joint for communicating the hollow rotating shaft is arranged on the hose reel and is communicated with the fire hose wound on the hose reel, a rotary joint is communicated between the hollow rotating shaft and the water delivery hose, a supporting plate, a limiting supporting shaft and a limiting plate for supporting are arranged at the bottom of the supporting plate, and a positioning vertical plate is fixedly connected to one side of the hose reel at the top of the supporting plate, the positioning vertical plate is provided with a sliding block capable of moving longitudinally, one end of the fire hose, which is far away from the pipe joint, penetrates through a through hole formed in the sliding block, and the sliding block moves longitudinally in a reciprocating manner so that the fire hose can be uniformly wound on the hose reel.

Optionally, two location curb plates of bottom fixedly connected with of backup pad, limiting plate and a year board all cup joint with two location curb plate pivots, and the limiting plate is located the one side of being close to the location axle, and a year board is located the one side of keeping away from the location axle.

Optionally, the length of the limiting plate is half of the length of the supporting plate, three limiting support shafts are movably sleeved in the supporting plate, one ends, far away from the supporting plate, of the three limiting support shafts can extend and are clamped with the side faces of the limiting plate, and limiting bolts for fixing the limiting support shafts are arranged at the bottom of the supporting plate.

Optionally, a supporting block is arranged on one side, away from the limiting fulcrum, of the limiting plate, and the supporting block is in contact with the wall surface when the limiting plate rotates to the vertical state.

Optionally, a longitudinal sliding groove is formed in the positioning vertical plate, the sliding block is movably sleeved in the longitudinal sliding groove, and the maximum height difference value of the longitudinal movement of the sliding block is the same as the distance value between the inner sides of the two discs of the hose reel.

Optionally, a limiting transverse plate is fixedly connected to the top of the positioning vertical plate, the limiting transverse plate and the supporting plate are in a parallel state, one side of the limiting transverse plate, which is far away from the positioning vertical plate, is movably sleeved with the hollow rotating shaft, a driving gear is fixedly sleeved on the hollow rotating shaft and positioned between the limiting transverse plate and the hose reel, a driven rotating shaft is movably sleeved on the limiting transverse plate, a driven gear is fixedly sleeved on the driven rotating shaft and positioned on one side of the driving gear, the outer edge of the driven gear is meshed with the outer edge of the driving gear, a rotating disc is fixedly sleeved on the driven rotating shaft and positioned above the limiting transverse plate, a vertical shaft is fixedly connected to the outer edge of the top of the rotating disc, a rope buckle ring is sleeved on the vertical shaft through a bearing, the rotary diameter value of the rope buckle ring is the same as the maximum height difference value of the longitudinal movement of the slider, a rope buckle plate is fixedly connected to the top of the slider, and a stay rope is fixedly connected between the rope buckle plate and the rope buckle ring, the bottom fixedly connected with first diaphragm of slider, the bottom fixedly connected with of backup pad is located the second diaphragm of first diaphragm below, fixedly connected with extension spring between first diaphragm and the second diaphragm.

Optionally, the positioning vertical plate is further provided with limiting sliding grooves located on two sides of the longitudinal sliding groove, two sides of the sliding block are respectively and fixedly connected with limiting blocks, the two limiting blocks are respectively movably sleeved with the two limiting sliding grooves, and the height values of the two limiting sliding grooves are identical to the height values of the longitudinal sliding groove.

Optionally, the top of the limiting plate is provided with a magnetic block, and the bottom of the supporting plate is provided with a magnetic plate magnetically attracted to the magnetic block.

The invention provides a fire hose reel for an indoor fire hydrant, which has the following beneficial effects:

1. this indoor fire hose reel for fire hydrant, go out the outside backup pad of fire hose box through the upset, hose reel structural design, utilize the limiting plate, support the board, spacing counter roll forms triangle-shaped and supports, make the backup pad, the hose reel keeps the horizontality, make the high pressure water circulate from the winding fire hose on the hose reel steadily, and then ensure that hydroenergy can spout the operation of putting out a fire steadily, the effectual current fire hose reel of having avoided is rather than the bearing of supporting its rotation, weight is great when hose leads to water because of fire hose reel, easy wearing and tearing consume, influence the rotatory release of fire hose reel when leading to water or rolling fire hose, and then influence the efficiency problem of water spray fire control operation.

2. This indoor fire hose reel for fire hydrant, after fire-fighting operation finishes the rolling good fire hose, because of the hose reel is in the horizontality, the water in the fire hose of being convenient for discharges completely under the action of gravity, and in the fire hose was played back in the upset again, it was more to have avoided the interior surplus water of fire hose, the inconvenient problem of getting rid of.

3. This indoor fire hose reel for fire hydrant, pass through the backup pad, hose reel upset goes out the fire hose and is the horizontality, but the slider of longitudinal movement that sets up in the cooperation backup pad, the rotatory structural design who receive and releases the fire hose that links the hose reel, after the fire-fighting operation, when hose reel rotation carries out the fire hose of rolling release, slider longitudinal movement makes the winding that the fire hose can be even on the hose reel, avoid placing because of the level of hose reel, lead to the hose reel when rolling fire hose, the hose concentrates the winding at the lower half of hose reel, influence the problem of follow-up hose continuation rolling work, and need not extra power drive slider reciprocating motion, avoid too much energy consumption problem.

Drawings

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

FIG. 2 is a schematic view of the hose reel of FIG. 1 according to the present invention;

fig. 3 is a side view of fig. 1 of the present invention.

In the figure: 1. a fire box; 2. a fire hydrant; 3. positioning the shaft; 4. a support plate; 5. a hose reel; 6. a water delivery hose; 7. positioning the side plate; 8. a limiting plate; 9. supporting a support plate; 10. a limiting fulcrum shaft; 11. a limit bolt; 12. positioning a vertical plate; 13. a longitudinal chute; 14. a slider; 15. a first transverse plate; 16. a tension spring; 17. a second transverse plate; 18. rope buckle plates; 19. pulling a rope; 20. a driven shaft; 21. a turntable; 22. a rope buckle ring; 23. a driven gear; 24. a rotary joint; 25. a hollow rotating shaft; 26. a driving gear; 27. a transverse limiting plate; 28. an end face bearing; 29. and a limiting sliding groove.

Detailed Description

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

Referring to fig. 1, a fire hose reel for an indoor fire hydrant includes a fire hydrant 1 fixed in a wall, a fire hydrant 2 is disposed at one corner of the bottom of an inner cavity of the fire hydrant 1, a positioning shaft 3 is fixedly sleeved between inner walls of two sides of the fire hydrant 1, the positioning shaft 3 is close to the bottom of an opening side of the fire hydrant 1, a support plate 4 is movably sleeved in the middle of the positioning shaft 3, the support plate 4 is rotatable to the outer side of the fire hydrant 1 and is in a horizontal state, referring to fig. 2-3, an end face bearing 28 is fixedly installed in the middle of the top end of the support plate 4, a hose reel 5 is fixedly installed at the top of the end face bearing 28, the fire hose is wound on the hose reel 5, a hollow rotating shaft 25 is fixedly sleeved between two disks of the hose reel 5, and a pipe joint communicated with the hollow rotating shaft 25 is disposed on the hose reel 5 and is located between the two disks of the hose reel 5, and the coupling is put through with the inside of hollow rotating shaft 25, the top switch-on of fire hydrant 2 has water hose 6, switch-on has rotary joint 24 between one end that water hose 6 kept away from fire hydrant 2 and hollow rotating shaft 25 to when hose reel 5 carries out rotatory release rolling fire hose, utilize rotary joint 24's switch-on effect, when making the rotatory rolling of hose reel 5 or release the fire hose on it, do not influence the fire hose 2 internal water and get into the fire hose, and be equipped with the valve on the water hose 6.

Two location curb plates 7 of the bottom fixedly connected with of backup pad 4, the limiting plate 8 that is close to location axle 3 one side has been cup jointed to the pivot between two location curb plates 7, it has a carrier plate 9 of keeping away from limiting plate 8 one side to go back the pivot cup joint between two location curb plates 7, limiting plate 8 and carrier plate 9 homoenergetic are rotatory to the inboard of two location curb plates 7, and the length of limiting plate 8 is half of a carrier plate 9 length, the inside movable sleeve of carrier plate 9 is equipped with three spacing counter roll 10, and the one end that a carrier plate 9 was kept away from to three spacing counter roll 10 all can extend and with limiting plate 8's side joint, the bottom of carrier plate 9 is equipped with carries out the spacing bolt 11 fixed to spacing counter roll 10, limiting plate 8 keeps away from one side of spacing counter roll 10 and is equipped with the supporting shoe, and the supporting shoe contacts with the wall when limiting plate 8 rotates to vertical state.

When fire fighting operation is not carried out, the supporting plate 4 rotates relative to the positioning shaft 3, so that the supporting plate 4 and the hose reel 5 integrally rotate to the inside of the fire fighting box 1 to be placed for standby, when fire fighting operation is required, the supporting plate 4 rotates out of the outer side of the fire fighting box 1, as shown in figure 3, at the moment, the supporting block on one side of the limiting plate 8 is contacted with the wall surface, then the limiting fulcrum shaft 10 in the supporting plate 9 is delayed to be clamped with the side surface of the limiting plate 8, so that the limiting plate 8, the supporting plate 9, the limiting fulcrum shaft 10 and the supporting plate 4 form triangular support, the hose reel 5 on the supporting plate 4 is always kept in a horizontal state when the fire fighting hose is stored and released, high-pressure water stably circulates from the fire fighting hose wound on the hose reel 5, water is further ensured to be stably sprayed out for fire fighting operation, and the existing fire fighting hose reel and a bearing supporting the rotation shaft are effectively avoided, because of weight is great when hose leads to water on the fire hose reel, easy wearing and tearing consume, influence the rotatory release of fire hose reel when leading to water or rolling fire hose, and then influence the efficiency problem of water spray fire-fighting operation, and, after the fire-fighting operation finishes the rolling fire hose, because of hose reel 5 is in the horizontality, the water in the fire hose of being convenient for discharges completely under the action of gravity, in overturning playback to fire hose 1 again, it is more to have avoided the interior surplus water of fire hose, the inconvenient problem of getting rid of.

Further, the top fixedly connected with of backup pad 4 keeps away from location riser 12 of 3 one sides of location axle, vertical spout 13 has been seted up on the location riser 12, but be equipped with longitudinal movement's slider 14 in the vertical spout 13, and the maximum height difference value of 14 longitudinal movement of slider is the same with the inboard interval value of two discs of hose reel 5, the through-hole has been seted up on the slider 14, the fire hose of coiling on the hose reel 5 cup joints with this through-hole activity, after the fire control operation, when hose reel 5 rotates the fire hose of rolling release, slider 14 longitudinal movement makes the winding that the fire hose can be even on hose reel 5, avoid placing because of hose reel 5's level, lead to hose reel 5 when rolling fire hose, the hose concentrates the winding in the lower half of hose reel 5, influence the problem that follow-up hose continues rolling work.

The top of the positioning vertical plate 12 is fixedly connected with a limiting transverse plate 27, the limiting transverse plate 27 and the supporting plate 4 are in a parallel state, one side of the limiting transverse plate 27 far away from the positioning vertical plate 12 is movably sleeved with the hollow rotating shaft 25, a driving gear 26 positioned between the limiting transverse plate 27 and the hose reel 5 is fixedly sleeved on the hollow rotating shaft 25, a driven rotating shaft 20 is movably sleeved on the limiting transverse plate 27, a driven gear 23 positioned on one side of the driving gear 26 is fixedly sleeved on the driven rotating shaft 20, the outer edge of the driven gear 23 is meshed with the outer edge of the driving gear 26, a rotating disc 21 positioned above the limiting transverse plate 27 is fixedly sleeved on the driven rotating shaft 20, the outer edge of the top of the rotating disc 21 is fixedly connected with a vertical shaft, a rope buckle ring 22 is sleeved on the vertical shaft through a bearing, the rotary diameter value of the rope buckle ring 22 is the same as the maximum height difference value of the longitudinal movement of the sliding block 14, and the top end of the sliding block 14 is fixedly connected with a rope buckle plate 18, a pull rope 19 is fixedly connected between the rope fastening plate 18 and the rope fastening ring 22, a first transverse plate 15 is fixedly connected to the bottom of the sliding block 14, a second transverse plate 17 located below the first transverse plate 15 is fixedly connected to the bottom of the supporting plate 4, and a tension spring 16 is fixedly connected between the first transverse plate 15 and the second transverse plate 17.

When the hose reel 5 rotates, the driving gear 26 drives the driven gear 23 and the driven rotating shaft 20 to rotate, so that the pulling rope 19 is matched with the tension spring 16 to pull the slider 14 to reciprocate and move longitudinally, and the water guide hose passing through the through hole in the slider 14 can be uniformly wound on the hose reel 5 when the hose reel 5 is wound, but is not concentrated on the lower half part of the hose reel 5, so that the hose can be normally used next time.

The locating vertical plate 12 is further provided with limiting sliding grooves 29 located on two sides of the longitudinal sliding groove 13, two sides of the sliding block 14 are respectively fixedly connected with limiting blocks, the two limiting blocks are respectively movably sleeved with the two limiting sliding grooves 29, the height values of the two limiting sliding grooves 29 are the same as the height value of the longitudinal sliding groove 13, the limiting sliding grooves 29 are utilized to limit the horizontal position of the longitudinal sliding groove 13, and the sliding block 14 is ensured to only stably move longitudinally.

The top of limiting plate 8 is equipped with the magnetic path, and the bottom of backup pad 4 is equipped with the magnetic sheet that attracts mutually with the magnetic path magnetism, and when backup pad 4, hose reel 5 are whole around 3 rotatory inside to fire hose 1 of location axle, the magnetic sheet through backup pad 4 bottoms is to the magnetic attraction of magnetic path for limiting plate 8 keeps vertical state, is located between two location curb plates 7, thereby does not account for the space.

When the fire hose reel for the indoor fire hydrant is used, when fire fighting operation is not needed, the supporting plate 4 and the hose reel 5 are integrally rotated around the positioning shaft 3 to the inside of the fire box 1 to be placed, one end of the fire hose is fixedly sleeved with the pipe joint on the hose reel 5, then the fire hose is uniformly wound on the hose reel 5, the other end of the fire hose penetrates through the through hole on the sliding block 14 and then is fixedly sleeved with the spray head, when fire fighting operation is needed, the supporting plate 4 and the hose reel 5 are integrally rotated out of the fire box 1 around the positioning shaft 3, the limiting fulcrum shaft 10 is stretched until one end of the limiting fulcrum shaft is clamped with the limiting plate 8, then the limiting bolt 11 is screwed and fixed, so that the supporting plate 4 is supported to be kept in a horizontal state, the end face bearing 28 on the supporting plate 4 is used for supporting the hose reel 5 to rotate, and then the fire hose can be pulled out, be located conflagration department to the shower nozzle, put out a fire can, after putting out a fire, carry out rolling fire control hose through reverse rotation hose reel 5, at this moment, drive hollow rotating shaft 25 at hose reel 5 and rotate down, meshing effect through hollow rotating shaft 25 and driven gear 23 makes carousel 21 rotatory thereupon, 19 cooperation extension springs of stay cord 16 make slider 14 longitudinal movement in vertical spout 13, thereby be convenient for fire control hose even coiling on hose reel 5, and finally, retrieve spacing fulcrum shaft 10 to in the spacing bolt 11, and with backup pad 4, hose reel 5 is whole around location axle 3 rotatory to fire hose 1 in, can.

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

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

Claims

1. The utility model provides an indoor fire hose reel for fire hydrant, is equipped with fire hydrant (2) including installing fire hose (1) in the wall body in one corner of fire hose (1) inner chamber bottom, and the switch-on has water hose (6), its characterized in that on fire hydrant (2): fixed cover is equipped with location axle (3) between the both sides inner wall of fire hose (1), and location axle (3) are close to fire hose (1) open-ended one side, the middle part movable sleeve of location axle (3) is equipped with backup pad (4) that can overturn out fire hose (1) outside, the top of backup pad (4) is supported there is rotatable hose reel (5), fixed cover is equipped with hollow pivot (25) between two discs of hose reel (5), and is equipped with the coupling of putting through hollow pivot (25) on hose reel (5), and the coupling is put through with the fire hose of winding on hose reel (5), put through rotary joint (24) between hollow pivot (25) and water delivery hose (6), the bottom of backup pad (4) is equipped with and is used for a year board (9), spacing fulcrum (10), limiting plate (8) that support, the top of backup pad (4) is still fixedly connected with and is located location riser (12) of hose reel (5) one side, is equipped with slider (14) that can longitudinal movement on location riser (12), and the one end that the coupling was kept away from to the fire hose runs through the through-hole of seting up on slider (14), and slider (14) reciprocal longitudinal movement makes the fire hose evenly to wind on hose reel (5).

2. A fire hose reel for an indoor fire hydrant according to claim 1, wherein: the bottom fixedly connected with of backup pad (4) two location curb plates (7), limiting plate (8) and a support board (9) all rotate with two location curb plates (7) and cup joint, and limiting plate (8) are located the one side of being close to location axle (3), and a support board (9) are located the one side of keeping away from location axle (3).

3. A fire hose reel for an indoor hydrant according to claim 2, wherein: the length of limiting plate (8) is half of a supporting plate (9) length, the inside movable sleeve of supporting plate (9) is equipped with three spacing fulcrum shaft (10), and three spacing fulcrum shaft (10) keep away from the one end of supporting plate (9) all can extend and with the side joint of limiting plate (8), the bottom of supporting plate (9) is equipped with carries out the spacing bolt (11) fixed to spacing fulcrum shaft (10).

4. A fire hose reel for an indoor hydrant according to claim 2, wherein: one side of the limiting plate (8) far away from the limiting fulcrum shaft (10) is provided with a supporting block, and the supporting block is in contact with the wall surface when the limiting plate (8) rotates to be in a vertical state.

5. A fire hose reel for an indoor fire hydrant according to claim 1, wherein: the hose reel is characterized in that a vertical sliding groove (13) is formed in the positioning vertical plate (12), a sliding block (14) is movably sleeved in the vertical sliding groove (13), and the maximum height difference value of the longitudinal movement of the sliding block (14) is the same as the distance value between the inner sides of two discs of the hose reel (5).

6. A fire hose reel for an indoor hydrant according to claim 5, wherein: the top fixedly connected with spacing diaphragm (27) of location riser (12), spacing diaphragm (27) and backup pad (4) are in parallel state, and spacing diaphragm (27) keep away from one side and the activity of hollow rotating shaft (25) of location riser (12) and cup joint, fixed cover is equipped with driving gear (26) that are located between spacing diaphragm (27) and hose reel (5) on hollow rotating shaft (25), movable sleeve is equipped with passive pivot (20) on spacing diaphragm (27), fixed cover is equipped with driven gear (23) that are located driving gear (26) one side on passive pivot (20), and the outer edge of driven gear (23) meshes with the outer edge of driving gear (26), fixed cover is equipped with carousel (21) that are located spacing diaphragm (27) top on passive pivot (20), the outer edge fixedly connected with vertical axis at carousel (21) top, the utility model discloses a vertical axis is last to be equipped with rope buckle (22) through the bearing cover, the gyration diameter value of rope buckle (22) is the same with slider (14) longitudinal movement's maximum difference in height value, the top fixedly connected with rope buckle (18) of slider (14), fixedly connected with stay cord (19) between rope buckle (18) and rope buckle (22), the first diaphragm of bottom fixedly connected with (15) of slider (14), the bottom fixedly connected with of backup pad (4) is located second diaphragm (17) of first diaphragm (15) below, fixedly connected with extension spring (16) between first diaphragm (15) and second diaphragm (17).

7. A fire hose reel for an indoor hydrant according to claim 5, wherein: the positioning vertical plate (12) is further provided with limiting sliding grooves (29) located on two sides of the longitudinal sliding groove (13), two sides of the sliding block (14) are respectively fixedly connected with limiting blocks, the two limiting blocks are respectively movably sleeved with the two limiting sliding grooves (29), and the height values of the two limiting sliding grooves (29) are identical to the height value of the longitudinal sliding groove (13).

8. A fire hose reel for an indoor fire hydrant according to claim 1, wherein: the top of the limiting plate (8) is provided with a magnetic block, and the bottom of the supporting plate (4) is provided with a magnetic plate which is magnetically attracted with the magnetic block.