A rigidity testing device having a function of preventing material damage

Abstract

The application discloses a rigidity testing device with a material damage prevention function and relates to the technical field of rigidity testing devices. The rigidity testing device comprises a rack, a moving module arranged on the rack, a longitudinal electric cylinder installed on the moving module, a supporting shaft connected to the telescopic rod of the longitudinal electric cylinder, a rotating cylinder installed on the supporting shaft, a rotating plate installed below the rotating cylinder, a plurality of clamping plates rotatably installed on the rotating plate, two groups of negative pressure belts installed on the clamping plates, an impact rod installed between the two groups of negative pressure belts, a bearing frame installed below the rotating cylinder, a clamping electric cylinder installed on the bearing frame, a plurality of laser displacement sensors installed on the outer side of the bearing frame, a storage box installed on one side of the bearing frame, and two groups of feeding lines installed in the storage box. The plurality of laser displacement sensors detect the displacement of material plates. After being processed by a control system, the rigidity of the material plates is obtained. The rigidity of the material plates is detected and measured in a vibrating mode, and the material plates are not damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rigidity testing device, and particularly relates to a rigidity testing device with a material damage prevention function. BACKGROUND

[0002] Rigidity refers to the ability of a material or structure to resist elastic deformation under stress, and is a representation of the difficulty of elastic deformation of the material or structure. In the field of performance testing of engineering materials and structural parts, rigidity, as a key indicator for measuring the ability of an object to resist elastic deformation, directly affects the durability and safety of products. Rigidity testing is a process of determining the ability of an object to resist deformation under stress. Rigidity testing evaluates the deformation of a material or component under load by applying a specific load, thereby determining the rigidity thereof.

[0003] The existing rigidity testing device mainly has the following problems: (1) the testing efficiency is low, and it is difficult to meet the batch testing demand, (2) the surface of the material plate after testing is easily damaged, causing waste. SUMMARY

[0004] The present application aims to provide a rigidity testing device with a material damage prevention function to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a rigidity testing device with a material damage prevention function, comprising a rack, a moving module is arranged on the rack, a longitudinal electric cylinder is installed on the moving module, a supporting shaft is connected to the telescopic rod of the longitudinal electric cylinder, a rotating cylinder is installed on the supporting shaft, a rotating plate is installed below the rotating cylinder, a plurality of clamping plates are rotatably installed on the rotating plate, two groups of negative pressure belts are installed on the clamping plates, a striking rod is installed between the two groups of negative pressure belts, a bearing frame is installed below the rotating cylinder, a clamping electric cylinder is installed on the bearing frame, a plurality of laser displacement sensors are installed on the outer side of the bearing frame, a storage box is installed on one side of the bearing frame, and two groups of feeding lines are installed in the storage box.

[0006] The supporting shaft is provided with a lifting groove, and the inner wall of the rotating cylinder is provided with a sliding shaft which is in sliding connection with the lifting groove;

[0007] The rotating plate is rotatably installed on the supporting shaft, a circular ring plate is rotatably arranged on the upper side of the rotating cylinder, a plurality of telescopic shafts are rotatably connected to the lower side of the rotating cylinder, the plurality of telescopic shafts are of telescopic structure, one end of each telescopic shaft is rotatably connected to the clamping plate, a memory wire is connected between the circular ring plate and the supporting shaft, and the memory wire is electrically connected to the control system at both ends.

[0008] Two groups of the negative pressure belts are in contact with a plurality of groups of negative pressure rollers, the plurality of groups of negative pressure rollers are installed on the clamping plate, the inside of the negative pressure belt is connected with a negative pressure system through an air slip ring and a pipeline, a plurality of negative pressure holes are arranged on the negative pressure belt, and the air slip ring is installed on the clamping plate.

[0009] The two groups of feeding lines each comprise a conveying roller, a conveying belt and a material carrying plate, the conveying roller is installed on the storage box, the conveying roller and the material carrying plate are each provided in a plurality of groups, the material carrying plate carries a material plate, the inside of the conveying belt is in contact with a plurality of groups of conveying rollers, and a plurality of groups of the material carrying plates are arranged on the conveying belt.

[0010] A plurality of groups of adsorption holes are arranged on the inner wall of the storage box, and the plurality of groups of adsorption holes are connected with a negative pressure system through a pipeline.

[0011] The clamping cylinders are provided in a plurality of groups, the plurality of groups of clamping cylinders are each installed on the bearing frame, a bearing plate is slidingly installed in the middle of the bearing frame, a bearing shaft is connected between the bearing plate and the rack, the bearing shaft is of a telescopic structure, a damping spring is sleeved on the bearing shaft, one end of the damping spring is connected with the bearing plate, the other end of the damping spring is provided with a damping ring, the damping ring is slidingly connected with the bearing shaft, the damping ring is connected with a telescopic rod of a jacking cylinder, and the jacking cylinder is installed on the rack.

[0012] The moving module comprises a transverse module and a longitudinal module, the transverse module comprises a transverse motor, a transverse screw rod and a transverse sliding plate, the transverse motor is installed on the rack, an output shaft of the transverse motor is connected with the transverse screw rod, the transverse screw rod is connected with the rack through a bearing seat, the bearing seat is arranged on the rack, the transverse sliding plate is threadedly connected with the transverse screw rod, and the transverse sliding plate is slidingly connected with the rack.

[0013] The longitudinal module comprises a longitudinal motor, a longitudinal screw rod and a longitudinal sliding plate, the longitudinal motor is installed on the transverse sliding plate, the longitudinal motor is connected with the longitudinal screw rod, the longitudinal screw rod is connected with the transverse sliding plate through another group of bearing seats, another group of the bearing seats are installed on the transverse sliding plate, the longitudinal sliding plate is threadedly connected with the longitudinal screw rod, and the longitudinal motor is installed on the longitudinal sliding plate.

[0014] A circular groove is arranged on the clamping plate, the impact rod is located in the circular groove, and a second spring is connected between the impact rod and the clamping plate.

[0015] A control panel is arranged on the rack, and a control system is arranged in the control panel.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The storage box automatically feeds and removes dust to improve test efficiency. The left conveyor roller drives the left conveyor belt to rotate counterclockwise, while the right conveyor roller drives the right conveyor belt to rotate clockwise. The conveyor belts on both sides simultaneously drive the material plates upward through the loading plate. When the material plates are in the storage box, the control system uses the negative pressure system and adsorption holes to extract air dust and air to achieve dust removal of the material plates, preventing dust from adversely affecting the stiffness test and improving stiffness test efficiency.

[0018] 2. Vibration test to prevent damage to the material plate. When the impact rod approaches the surface of the material plate, the control system continuously energizes and deenergizes the second spring. After the second spring is energized, each turn generates a mutually attractive magnetic field. The mutually attractive magnetic field shortens the second spring as a whole, and the second spring pulls the impact rod away from the material plate; when the second spring is deenergized, the second spring gradually lengthens under its own elastic force, and the second spring pushes the impact rod toward the material plate, causing one end of the impact rod to hit the material plate. By continuously energizing and deenergizing the second spring, the impact rod continuously hits the material plate, causing the material plate to vibrate. At this time, multiple groups of laser displacement sensors detect the displacement of the material plate and feed the data back to the control system. After processing, the control system obtains the stiffness of the material plate; the use of vibration to detect and measure the stiffness of the material plate will not cause damage to the material plate.

[0019] 3. Buffer plates are used to prevent scratches on the material plates. Staff flexibly adjust the extension and retraction length of the lifting cylinder based on the required buffering effect of the material plates. When the lifting cylinder extends, it drives the shock-absorbing ring upward, making the shock-absorbing spring between the load plate and the shock-absorbing ring denser. This gradually improves the buffering effect of the load plate and prevents scratches on the material plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0021] Figure 2 It is a structural diagram of the longitudinal motor in the present invention;

[0022] Figure 3 It is a structural schematic diagram of the storage box in the present invention;

[0023] Figure 4 It is a schematic structural diagram of the shock-absorbing spring in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the rotating drum in the present invention;

[0025] Figure 6 It is a structural schematic diagram of the circular ring plate in the present invention.

[0026] In the figure: 1. control panel; 11. frame; 2. longitudinal electric cylinder; 21. support shaft; 211. lifting groove; 22. rotating cylinder; 221. sliding shaft; 222. circular ring plate; 223. telescopic shaft; 224. memory wire; 23. rotating plate; 231. clamping plate; 24. negative pressure belt; 241. negative pressure roller; 25. impact rod; 251. second spring; 3. bearing frame; 31. clamping electric cylinder; 32. bearing plate; 33. bearing shaft; 34. shock-absorbing spring; 35. shock-absorbing ring; 36. lifting electric cylinder; 4. storage box; 41. conveying roller; 42. conveyor belt; 43. loading plate; 5. transverse motor; 51. transverse screw rod; 52. transverse slide plate; 6. longitudinal motor; 61. longitudinal screw rod; 62. longitudinal slide plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example: Figures 1-6 As shown, the present invention provides a technical solution for a stiffness testing device with a function of preventing material damage, comprising a frame 11, a mobile module provided on the frame 11, a longitudinal electric cylinder 2 installed on the mobile module, a support shaft 21 connected to the telescopic rod of the longitudinal electric cylinder 2, a rotating cylinder 22 installed on the support shaft 21, a rotating plate 23 installed below the rotating cylinder 22, a plurality of clamping plates 231 rotatably installed on the rotating plate 23, two sets of negative pressure belts 24 installed on the clamping plates 231, and a pressure relief device 231 installed between the two sets of negative pressure belts 24. The impact rod 25 and the clamping plate 231 are provided with a circular groove, the impact rod 25 is located in the circular groove, and a second spring 251 is connected between the impact rod 25 and the clamping plate 231. A carrier frame 3 is installed under the rotating cylinder 22, and a clamping electric cylinder 31 is installed on the carrier frame 3. Multiple groups of laser displacement sensors (not shown in the figure) are installed on the outside of the carrier frame 3, and a storage box 4 is installed on one side of the carrier frame 3. Two groups of feeding lines are installed in the storage box 4. A control panel 1 is provided on the frame 11, and a control system is provided in the control panel 1.

[0029] The support shaft 21 is provided with a lifting groove 211, and the inner wall of the rotating cylinder 22 is provided with a sliding shaft 221 which is in sliding connection with the lifting groove 211; the rotating plate 23 is rotatably installed on the support shaft 21, the upper side of the rotating cylinder 22 is rotatably provided with a circular ring plate 222, and the lower side of the rotating cylinder 22 is rotatably connected with a plurality of telescopic shafts 223 which are of telescopic structure, one end of each telescopic shaft 223 is rotatably connected with a clamping plate 231, the memory wire 224 is connected between the circular ring plate 222 and the support shaft 21, and both ends of the memory wire 224 are electrically connected with the control system.

[0030] The inner sides of the two groups of negative pressure belts 24 are in contact with a plurality of negative pressure rollers 241 which are installed on the clamping plates 231, the inner part of the negative pressure belt 24 is connected with the negative pressure system through an air slide ring (not shown in the figure) and a pipeline, a plurality of negative pressure holes are arranged on the negative pressure belt 24, and the air slide ring is installed on the clamping plate 231.

[0031] Each of the two groups of feeding lines comprises a conveying roller 41, a conveying belt 42 and a material carrying plate 43, the conveying roller 41 is installed on the storage box 4, both the conveying roller 41 and the material carrying plate 43 are provided with a plurality of groups, the material carrying plate 43 carries a material plate, the inner side of the conveying belt 42 is in contact with a plurality of conveying rollers 41, and a plurality of material carrying plates 43 are arranged on the conveying belt 42; a plurality of adsorption holes are arranged on the inner wall of the storage box 4 and connected with the negative pressure system (not shown in the figure) through a pipeline.

[0032] When the material plate is in the storage box 4, the control system extracts air dust and air outward through the negative pressure system and the adsorption holes, so as to realize dust removal treatment of the material plate and prevent dust from causing adverse effects on the rigidity test.

[0033] The bearing frame 3 is installed on the rack 11, the clamping electric cylinders 31 are provided with a plurality of groups, the plurality of groups of clamping electric cylinders 31 are installed on the bearing frame 3, the bearing plate 32 is slidably installed in the middle of the bearing frame 3, the bearing shaft 33 is connected between the bearing plate 32 and the rack 11, the bearing shaft 33 is of telescopic structure, the damping spring 34 is sleeved on the bearing shaft 33, one end of the damping spring 34 is connected with the bearing plate 32, the other end of the damping spring 34 is provided with a damping ring 35, the damping ring 35 is in sliding connection with the bearing shaft 33, the damping ring 35 is connected with the telescopic rod of the jacking electric cylinder 36, and the jacking electric cylinder 36 is installed on the rack 11.

[0034] When the material plate is placed on the bearing plate 32, the worker flexibly adjusts the telescopic length of the jacking electric cylinder 36 according to the required buffering effect of the material plate; when the jacking electric cylinder 36 is elongated, the jacking electric cylinder 36 drives the damping ring 35 to move upward, so that the damping spring 34 between the bearing plate 32 and the damping ring 35 becomes denser, and the buffering effect of the bearing plate 32 gradually becomes better.

[0035] The moving module comprises a transverse module and a longitudinal module, the transverse module comprises a transverse motor 5, a transverse screw rod 51 and a transverse sliding plate 52, the transverse motor 5 is installed on the rack 11, the output shaft of the transverse motor 5 is connected with the transverse screw rod 51, the transverse screw rod 51 is connected with the rack 11 through a bearing seat, the bearing seat is arranged on the rack 11, the transverse sliding plate 52 is threadedly connected with the transverse screw rod 51, and the transverse sliding plate 52 is slidably connected with the rack 11; the longitudinal module comprises a longitudinal motor 6, a longitudinal screw rod 61 and a longitudinal sliding plate 62, the longitudinal motor 6 is installed on the transverse sliding plate 52, the longitudinal motor 6 is connected with the longitudinal screw rod 61, the longitudinal screw rod 61 is connected with the transverse sliding plate 52 through another bearing seat, the other bearing seat is installed on the transverse sliding plate 52, the longitudinal sliding plate 62 is threadedly connected with the longitudinal screw rod 61, and the longitudinal cylinder 2 is installed on the longitudinal sliding plate 62.

[0036] Working principle: press the start button on the control panel 1, the device starts, the left conveying roller 41 drives the left conveying belt 42 to rotate counterclockwise, the right conveying roller 41 drives the right conveying belt 42 to rotate clockwise, and the conveying belts 42 on both sides simultaneously drive the material plate to move upwards through the material plate 43, and the material plate is a steel plate.

[0037] When the material plate moves to the uppermost side of the storage box 4, the encoders in the conveying rollers 41 on both sides feed data to the control system, the control system drives the transverse screw rod 51 to rotate through the transverse motor 5, the transverse screw rod 51 drives the transverse sliding plate 52 to move, the transverse sliding plate 52 drives the longitudinal motor 6 to move, the longitudinal motor 6 drives the longitudinal screw rod 61 to rotate, the longitudinal screw rod 61 drives the longitudinal sliding plate 62 to move, the longitudinal sliding plate 62 drives the longitudinal cylinder 2, the supporting shaft 21 and the rotating cylinder 22 to move, and the supporting shaft 21 drives the clamping plate 231 to be located above the material plate.

[0038] When the clamping plate 231 is located above the material plate, the control system electrifies the memory wire 224, the memory wire 224 gradually shrinks after being electrified, the memory wire 224 drives the circular ring plate 222 to move upwards, the circular ring plate 222 drives the rotating cylinder 22 to move upwards, the sliding shaft 221 in the rotating cylinder 22 slides in the lifting groove 211, and the rotating cylinder 22 drives the clamping plate 231 to be in a horizontal state through the telescopic shaft 223.

[0039] When the clamping plate 231 is in the horizontal state, the control system drives the supporting shaft 21 to move downwards through the longitudinal cylinder 2, the supporting shaft 21 drives the rotating cylinder 22 and the clamping plate 231 to move downwards, so that the negative pressure belt 24 on the clamping plate 231 is in contact with the material plate, and the negative pressure system extracts air in the negative pressure belt 24 outward, so that the negative pressure hole adsorbs and positions the material plate.

[0040] When the negative pressure hole adsorbs and positions the material plate, the negative pressure system feeds back the pressure signal to the control system, the control system moves the material plate above the bearing plate 32 through the cooperation of the transverse module and the longitudinal module, then the longitudinal electric cylinder 2 drives the support shaft 21 and the rotating cylinder 22 to move downward, the support shaft 21 drives the clamping plate 231 to move downward, and the clamping plate 231 drives the material plate to move downward, so that the material plate is placed on the bearing plate 32.

[0041] When the material plate is placed on the bearing plate 32, the negative pressure system no longer extracts the air in the negative pressure belt 24 outward, and drives the support shaft 21, the rotating cylinder 22 and the clamping plate 231 to move upward through the longitudinal electric cylinder 2, then the clamping electric cylinder 31 positions the material plate.

[0042] When the material plate is positioned by the clamping electric cylinder 31, the control system de-energizes the memory wire 224, the memory wire 224 gradually lengthens under the action of its own elastic force, the memory wire 224 drives the circular ring plate 222 to move downward, the circular ring plate 222 drives the rotating cylinder 22 to move downward, the sliding shaft 221 in the rotating cylinder 22 slides downward, and the rotating cylinder 22 drives the clamping plate 231 to change from a horizontal state to a vertical state through the telescopic shaft 223, at this time, the impact rod 25 on the clamping plate 231 is opposite to the material plate.

[0043] When the impact rod 25 is opposite to the material plate, the control system drives the support shaft 21 and the rotating cylinder 22 to move downward through the longitudinal electric cylinder 2, the support shaft 21 drives the clamping plate 231 and the impact rod 25 to move downward, so that the impact rod 25 approaches the surface of the material plate.

[0044] When the impact rod 25 approaches the surface of the material plate, the control system continuously energizes and de-energizes the second spring 251, the second spring 251 generates a mutual attractive magnetic field after each turn after being energized, the mutual attractive magnetic field makes the second spring 251 shorten as a whole, and the second spring 251 drives the impact rod 25 to move away from the material plate; after the second spring 251 is de-energized, the second spring 251 gradually lengthens under the action of its own elastic force, the second spring 251 drives the impact rod 25 to move toward the material plate, so that one end of the impact rod 25 impacts the material plate, through the continuous energization and de-energization of the second spring 251, the impact rod 25 continuously impacts the material plate, so that the material plate vibrates, at this time, a plurality of laser displacement sensors detect the displacement of the material plate and feed back data to the control system, the control system obtains the stiffness of the material plate after processing, the stiffness of the material plate is detected and measured in the form of vibration, which does not cause damage to the material plate.

[0045] After the material plate is tested for stiffness, the control system controls the clamping electric cylinder 31 to release the material plate, and a worker takes down the material plate.

[0046] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A stiffness testing device with a function of preventing material damage, characterized in that: The utility model provides a kind of automatic packaging machine, including rack (11), mobile module is provided on the rack (11), longitudinal electric cylinder (2) is installed on the mobile module, the telescopic rod of longitudinal electric cylinder (2) is connected with support shaft (21), rotating cylinder (22) is installed on support shaft (21), rotating plate (23) is installed below rotating cylinder (22), multiple groups of clamping plate (231) are rotatably installed on rotating plate (23), two groups of negative pressure belt (24) are installed on clamping plate (231), impact rod (25) is installed between two groups of negative pressure belt (24), load carrier (3) is installed below rotating cylinder (22), clamping electric cylinder (31) is installed on load carrier (3), multiple groups of laser displacement sensors are installed outside load carrier (3), storage box (4) is installed on the side of load carrier (3), two groups of feeding line are installed in storage box (4). Load carrier (3) is installed on rack (11), multiple groups of clamping electric cylinder (31) are arranged, multiple groups of clamping electric cylinder (31) are installed on load carrier (3), load carrier (3) is slidably installed with bearing plate (32) in the middle, bearing shaft (33) is connected between bearing plate (32) and rack (11), bearing shaft (33) is telescopic structure, damping spring (34) is sleeved on bearing shaft (33), one end of damping spring (34) is connected with bearing plate (32), damping ring (35) is arranged at the other end of damping spring (34), damping ring (35) is slidably connected with bearing shaft (33), the telescopic rod of jacking cylinder (36) is connected with damping ring (35), jacking cylinder (36) is installed on rack (11). Clamping plate (231) is provided with circular groove, impact rod (25) is located in circular groove, second spring (251) is connected between impact rod (25) and clamping plate (231).

2. The rigidity testing device having a function of preventing material damage according to claim 1, characterized by: Lifting groove (211) is arranged on the surface of support shaft (21), sliding shaft (221) is arranged on the inner wall of rotating cylinder (22), sliding shaft (221) is slidably connected with lifting groove (211). Rotating plate (23) is rotatably installed on support shaft (21), circular ring plate (222) is rotatably arranged on the upper side of rotating cylinder (22), multiple groups of telescopic shaft (223) are rotatably connected on the lower side of rotating cylinder (22), multiple groups of telescopic shaft (223) are telescopic structure, one end of telescopic shaft (223) is rotatably connected with clamping plate (231), memory wire (224) is connected between circular ring plate (222) and support shaft (21), both ends of memory wire (224) are electrically connected with control system.

3. The rigidity testing device having a function of preventing material damage according to claim 2, characterized by: Multiple groups of negative pressure cylinders (241) are in contact with the inner side of two groups of negative pressure belts (24), multiple groups of negative pressure cylinders (241) are installed on clamping plate (231), negative pressure system is connected with negative pressure belt (24) inside through air slide ring and pipeline, a plurality of negative pressure holes are arranged on negative pressure belt (24), air slide ring is installed on clamping plate (231).

4. The rigidity testing device having a function of preventing material damage according to claim 3, characterized by: The feeding line comprises conveying rollers (41), conveying belts (42) and material boards (43), the conveying rollers (41) are installed on the storage box (4), the conveying rollers (41) and the material boards (43) are provided in multiple groups, the material boards (43) are loaded with material plates, the conveying belts (42) are in contact with the multiple groups of conveying rollers (41) on the inner side, and the multiple groups of material boards (43) are arranged on the conveying belts (42).

5. The rigidity testing device having a function of preventing material damage according to claim 4, characterized by: A plurality of adsorption holes are arranged on the inner wall of the storage box (4), and the plurality of adsorption holes are connected with the negative pressure system through pipelines.

6. The rigidity testing device having a function of preventing material damage according to claim 5, characterized by: The moving module comprises a transverse module and a longitudinal module, the transverse module comprises a transverse motor (5), a transverse screw rod (51) and a transverse sliding plate (52), the transverse motor (5) is installed on the rack (11), the output shaft of the transverse motor (5) is connected with the transverse screw rod (51), the transverse screw rod (51) is connected with the rack (11) through a bearing seat, the bearing seat is arranged on the rack (11), the transverse sliding plate (52) is threadedly connected with the transverse screw rod (51), and the transverse sliding plate (52) is slidably connected with the rack (11); The longitudinal module comprises a longitudinal motor (6), a longitudinal screw rod (61) and a longitudinal sliding plate (62), the longitudinal motor (6) is installed on the transverse sliding plate (52), the longitudinal motor (6) is connected with the longitudinal screw rod (61), the longitudinal screw rod (61) is connected with the transverse sliding plate (52) through another bearing seat, the other bearing seat is installed on the transverse sliding plate (52), the longitudinal sliding plate (62) is threadedly connected with the longitudinal screw rod (61), and the longitudinal motor (2) is installed on the longitudinal sliding plate (62).

7. The rigidity testing device having a function of preventing material damage according to claim 6, characterized by: The rack (11) is provided with a control panel (1), and the control panel (1) is provided with a control system.

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