High-safety thickener

By introducing designs such as beam-moving racks, hydraulic cylinders and testing components into the concentrator, the problems of sludge accumulation at the bottom of the concentrator and the rake rack stuck are solved, the safety and operation efficiency of the equipment are improved, and the normality of the concentrator is ensured. Run.

CN222266236UActive Publication Date: 2024-12-31YIXING OUYAHUADU ENVIRONMENT ENG CO LTD
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Patent Information

Application Number
CN202420845530.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-23
Publication Date
2024-12-31
Estimated Expiration
2034-04-23

AI Technical Summary

Technical Problem

When the existing concentrates add materials to the concentration pool, the material drops too quickly, causing sludge to accumulate at the bottom of the concentration pool, and the rake rack assembly comes into contact with the bottom of the concentration pool, which makes it too large, which makes it easy to cause the rake rack assembly to not rotate, which reduces the concentration machine. security of use.

Method used

A high-safe concentrator was designed, using a beam tray, a first motor, a rotating shaft, a rake arm, a hydraulic cylinder, a detection component and an alarm. The connecting plate is driven to lift and lower through the hydraulic cylinder to change the inclination of the rake arm , ensure the sludge cleaning effect, and prevent the mud discharge pipe from being blocked through the second motor and bevel gear, improving equipment safety.

Benefits of technology

Effectively prevent sludge from accumulating at the bottom of the concentrate, avoiding rake arm stuck, improves the safety of the use of the concentrate, and prevents the mud discharge pipe from being blocked, improving the operating efficiency of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a thickener with high safety, which comprises a walking beam frame arranged above a thickener main body, a first motor arranged above the walking beam frame, a rotating shaft arranged in the thickener main body, a second connecting disc arranged at the lower end of the rotating shaft, and a second connecting disc arranged at the lower end of the second connecting disc, rake arms are arranged on the two sides of the second connecting disc; the first connecting disc is arranged outside the rotating shaft, hinged supports are arranged above one ends of the two rake arms, and pull rods are arranged between the first connecting disc and the hinged supports; the fixing seat is arranged outside the rotating shaft, a hydraulic cylinder is arranged between the fixing seat and the first connecting disc, the rake frame assembly of the thickener can be rotationally adjusted through the hydraulic cylinder, the distance between the mud scraping plate and the bottom of the thickener is changed, and the inclination degree of the rake arms is sequentially reduced to clean sludge at the bottom of the thickener; sludge at the bottom of the thickener main body can be prevented from being accumulated too fast and too much to block the rake arm, and the use safety of the thickener is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of concentrators, in particular to a concentrator with high safety. Background Art

[0002] The concentrator is mainly composed of two parts: a circular concentrating tank and a rake scraper. It is generally composed of a concentrating tank, a cake rack, a transmission device, a cake rack lifting device, a feeding device, a unloading device and a signal safety device. It is suitable for the dehydration of concentrates and tailings in ore dressing plants. It is widely used in the treatment of sludge, wastewater and waste residue in metallurgy, chemical industry, coal, non-metallic ore dressing, environmental protection and other departments. It is of great significance to improve the utilization rate of return water and the underflow transportation concentration as well as to protect the environment. In fact, the high-efficiency concentrator is not a simple sedimentation equipment, but a new type of dehydration equipment combined with the filtration characteristics of the mud layer.

[0003] The Chinese patent publication number is CN219783822U, and the authorization announcement date is October 3, 2023. A concentrator with high operational safety includes a concentrator body, a fixed sleeve is fixedly installed on the outside of the concentrator body, a spring is fixedly installed on the top of the fixed sleeve, a movable plate is fixedly installed on the top of the spring, a mounting hole is opened on the top of the movable plate, and a slide rod is fixedly installed in the mounting hole. The utility model has a reasonable structural design. The material adhering to the inner wall of the concentrator body is scraped off by a scraper, which can avoid the problem of material adhering to the inner wall of the concentrator body and being inconvenient to clean, so that the staff does not need to clean it manually, thereby reducing the difficulty of the staff's work and reducing the risk of injury to the staff when cleaning the inner wall of the concentrator body, thereby improving the safety of the equipment. The discharge port is connected by the reciprocating motion of the conducting column, which can avoid the problem of material clogging at the discharge port and causing difficulty in discharging.

[0004] When adding materials to the existing thickener, the materials descend too quickly, causing a lot of sludge to accumulate at the bottom of the thickener. The rake assembly is directly brought into contact with the bottom of the thickener to scrape the sludge. The resistance of the rake assembly is too large, which can easily cause the rake assembly to be unable to rotate and be damaged, reducing the safety of the thickener and failing to meet usage requirements. Utility Model Content

[0005] The utility model aims to provide a concentrator with high safety, so as to solve the problem in the above-mentioned background technology that when adding materials into the concentrating tank, the materials in the existing concentrator drop too fast, which will cause a lot of sludge to accumulate at the bottom of the concentrating tank, and the rake frame assembly is directly contacted with the bottom of the concentrating tank to scrape the sludge. The resistance of the rake frame assembly is too large, which may easily cause the rake frame assembly to be unable to rotate and be damaged, thereby reducing the safety of the concentrator and failing to meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a concentrator with high safety, comprising a concentrator body, and further comprising:

[0007] A walking beam frame, which is arranged above the concentrator body, and the walking beam frame is fixedly connected to the concentrator body, a first motor is arranged above the walking beam frame, and the first motor is connected to the walking beam frame by screws, a rotating shaft is arranged inside the concentrator body, and one end of the rotating shaft is connected to the output end of the first motor, a second connecting disk is arranged at the lower end of the rotating shaft, and the second connecting disk is fixedly connected to the rotating shaft, rake arms are arranged on both sides of the second connecting disk, two rake arms are arranged, and one end of the two rake arms is rotatably connected to the second connecting disk, and a mud scraper is arranged below the two rake arms;

[0008] A first connecting disk is arranged outside the rotating shaft, a through hole is arranged at the center of the first connecting disk, the rotating shaft and the through hole are arranged to pass through, and the rotating shaft is slidably connected to the first connecting disk, a hinge seat is arranged above one end of each of the two rake arms, and the hinge seat is fixedly connected to the rake arm, a pull rod is arranged between the first connecting disk and the hinge seat, two pull rods are arranged, and both ends of the two pull rods are rotatably connected to the first connecting disk and the hinge seat respectively;

[0009] A fixed seat is arranged outside the rotating shaft and fixedly connected to the rotating shaft. The fixed seat is arranged above the first connecting plate. A hydraulic cylinder is arranged between the fixed seat and the first connecting plate. Two hydraulic cylinders are arranged, and two ends of the hydraulic cylinder are respectively fixedly connected to the first connecting plate and the fixed seat. The two hydraulic cylinders are arranged on both sides of the rotating shaft.

[0010] Preferably, a slide groove is provided on the side wall of the rotating shaft, two slide grooves are provided, and the two slide grooves are provided on both sides of the rotating shaft, a slider is provided inside the through hole, two sliders are provided, and the slider is fixedly connected to the first connecting plate, the slider is provided inside the slide groove, and the slider is slidably connected to the rotating shaft.

[0011] Preferably, a mud discharge pipe is provided at the center of the lower end of the concentrator body, and the mud discharge pipe and the concentrator body are integrated, a discharge auger and a cross plate are provided inside the mud discharge pipe, and the cross plate is fixedly connected to the mud discharge pipe, the discharge auger is rotatably connected to the cross plate, a bevel gear is provided below the discharge auger, two bevel gears are provided, and the two bevel gears are meshed and connected, a mounting frame is provided on one side of the mud discharge pipe, and the mounting frame is fixedly connected to the concentrator body, a second motor is provided below the mounting frame, and the second motor is connected to the mounting frame by screws, and the two bevel gears are respectively connected to the output end of the second motor and one end of the discharge auger.

[0012] Preferably, the scraper plates arranged below the two rake arms are staggered and contact the bottom of the concentrator body, a connecting block is arranged above the scraper plates, and the connecting block is fixedly connected to the scraper plates, an axle pin is arranged between the connecting block and the rake arm, and the connecting block and the rake arm are rotatably connected via the axle pin.

[0013] Preferably, a spring is provided on one side of the scraper blade, and two ends of the spring are fixedly connected to the rake arm and the scraper blade respectively.

[0014] Preferably, a guardrail is arranged above the walking beam frame, two guardrails are arranged, and the guardrails are fixedly connected to the walking beam frame, and the two guardrails are arranged on both sides of the first motor.

[0015] Preferably, a detection component is provided below the walking beam frame and is fixedly connected to the walking beam frame, the detection component is arranged on one side of the rotating shaft, an alarm is provided on one side of the guardrail and is fixedly connected to the guardrail, and the detection component and the alarm are arranged in linkage.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model device is provided with a first connecting plate, a pull rod, a hydraulic cylinder and a detection component. The hydraulic cylinder drives the first connecting plate to rise and fall along the rotating shaft. As the first connecting plate rises and falls, the pull rod is driven to rotate, and then the rake arm is driven to rotate, and the inclination of the installed rake arm is changed. The distance between the scraper plate and the bottom of the thickener body changes. By successively reducing the inclination of the rake arm, the sludge at the bottom of the thickener body can be better cleaned, which can prevent the sludge at the bottom of the thickener body from accumulating too quickly and jamming the rake arm. The detection component detects the motion parameters of the rotating shaft. When the rotating shaft is underspeed or stopped, the alarm is triggered to sound an alarm, thereby improving the safety of the thickener.

[0018] 2. The utility model device is provided with a connection block, an axle pin and a spring. The connection block and the axle pin rotatably connect the scraper plate to the rake arm, which is convenient for replacing a damaged scraper plate. The spring applies a pulling force to one end of the installed scraper plate, so that the scraper plate is in close contact with the bottom of the concentrator body, ensuring the scraping effect, and also making the installed scraper plate have a buffering effect;

[0019] 3. The utility model device is provided with a second motor, a discharge auger and a bevel gear. The second motor drives the bevel gear to rotate. The rotating bevel gear indirectly drives the discharge auger to rotate, and the sludge in the sludge discharge pipe is discharged, which can avoid blockage of the sludge discharge pipe and improve the use effect of the concentrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model;

[0022] Figure 3 For the utility model Figure 2 A partial enlarged view of area A;

[0023] Figure 4 This is a structural diagram of the connection between the first connecting disk and the rotating shaft of the utility model;

[0024] Figure 5 This is a diagram showing the connection relationship between the scraper blade and the rake arm of the utility model.

[0025] In the figure: 1. concentrator body; 2. walking beam frame; 3. first motor; 4. guardrail; 5. mud discharge pipe; 6. mounting frame; 7. second motor; 8. first connecting plate; 9. rake arm; 10. mud scraper; 11. hinge seat; 12. pull rod; 13. second connecting plate; 14. discharging auger; 15. rotating shaft; 16. fixed seat; 17. hydraulic cylinder; 18. through hole; 19. slider; 20. slide groove; 21. connecting block; 22. shaft pin; 23. spring; 24. bevel gear; 25. cross plate; 26. detection component; 27. alarm. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] See also Figure 1-5 The utility model provides an embodiment: a concentrator with high safety, including a concentrator body 1, and also including:

[0028] A walking beam frame 2 is arranged above the concentrator body 1, and the walking beam frame 2 is fixedly connected to the concentrator body 1, a first motor 3 is arranged above the walking beam frame 2, and the first motor 3 is connected to the walking beam frame 2 by screws, a rotating shaft 15 is arranged inside the concentrator body 1, and one end of the rotating shaft 15 is connected to the output end of the first motor 3, a second connecting disk 13 is arranged at the lower end of the rotating shaft 15, and the second connecting disk 13 is fixedly connected to the rotating shaft 15, rake arms 9 are arranged on both sides of the second connecting disk 13, two rake arms 9 are arranged, and one end of the two rake arms 9 is rotatably connected to the second connecting disk 13, and a scraper 10 is arranged below the two rake arms 9;

[0029] A first connecting plate 8 is arranged outside the rotating shaft 15, a through hole 18 is arranged at the center of the first connecting plate 8, the rotating shaft 15 and the through hole 18 are arranged to be connected, and the rotating shaft 15 is slidably connected to the first connecting plate 8, a hinge seat 11 is arranged above one end of each of the two rake arms 9, and the hinge seat 11 is fixedly connected to the rake arm 9, a pull rod 12 is arranged between the first connecting plate 8 and the hinge seat 11, two pull rods 12 are provided, and the two ends of the two pull rods 12 are rotatably connected to the first connecting plate 8 and the hinge seat 11 respectively;

[0030] A fixed seat 16 is arranged outside the rotating shaft 15 and is fixedly connected to the rotating shaft 15. The fixed seat 16 is arranged above the first connecting disk 8. A hydraulic cylinder 17 is arranged between the fixed seat 16 and the first connecting disk 8. Two hydraulic cylinders 17 are provided, and both ends of the hydraulic cylinder 17 are respectively fixedly connected to the first connecting disk 8 and the fixed seat 16. The two hydraulic cylinders 17 are arranged on both sides of the rotating shaft 15.

[0031] During use: turn on the first motor 3 to drive the rotating shaft 15 to rotate, and the rotation of the rotating shaft 15 drives the rake arm 9 to rotate. The rotating rake arm 9 drives the scraper plate 10 to move along the bottom of the concentrator body 1 to scrape off the sludge at the bottom of the concentrator body 1, and the first connecting plate 8 is driven to rise and fall along the rotating shaft 15 by the hydraulic cylinder 17. As the first connecting plate 8 rises and falls, the pull rod 12 is driven to rotate, and then the rake arm 9 is driven to rotate, changing the inclination of the installed rake arm 9, and the distance between the scraper plate 10 and the bottom of the concentrator body 1 changes. By successively reducing the inclination of the rake arm 9, the sludge at the bottom of the concentrator body 1 can be better cleaned, which can prevent the sludge at the bottom of the concentrator body 1 from accumulating too quickly and jamming the rake arm 9, thereby improving the safety of the concentrator.

[0032] See also Figure 2 and Figure 4 A slide groove 20 is provided on the side wall of the rotating shaft 15, and two slide grooves 20 are provided, and the two slide grooves 20 are provided on both sides of the rotating shaft 15. A slider 19 is provided inside the through hole 18, and two sliders 19 are provided, and the slider 19 is fixedly connected to the first connecting plate 8. The slider 19 is arranged inside the slide groove 20, and the slider 19 is slidably connected to the rotating shaft 15. The slider 19 and the slide groove 20 play a guiding and limiting role for the lifted first connecting plate 8, ensuring that the first connecting plate 8 is lifted and lowered smoothly, and better controlling the inclination adjustment of the two rake arms 9.

[0033] See also Figure 1 , Figure 2 and Figure 3A mud discharge pipe 5 is arranged at the center of the lower end of the thickener body 1, and the mud discharge pipe 5 is integrated with the thickener body 1. A discharge auger 14 and a cross plate 25 are arranged inside the mud discharge pipe 5, and the cross plate 25 is fixedly connected to the mud discharge pipe 5. The discharge auger 14 is rotatably connected to the cross plate 25. A bevel gear 24 is arranged below the discharge auger 14. Two bevel gears 24 are arranged, and the two bevel gears 24 are meshed and connected. A mounting frame 6 is arranged on one side of the mud discharge pipe 5, and the mounting frame 6 is fixedly connected to the thickener body 1. A second motor 7 is arranged below the mounting frame 6, and the second motor 7 is connected to the mounting frame 6 by screws. The two bevel gears 24 are respectively connected to the output end of the second motor 7 and one end of the discharge auger 14. The bevel gear 24 is driven to rotate by the second motor 7. The rotating bevel gear 24 indirectly drives the discharge auger 14 to rotate, so as to discharge the sludge in the mud discharge pipe 5, avoid blockage of the mud discharge pipe 5, and improve the use effect of the thickener.

[0034] See also Figure 2 and Figure 5 The scraper plates 10 arranged below the two rake arms 9 are staggered, and the scraper plates 10 are in contact with the bottom of the concentrator body 1. A connecting block 21 is arranged above the scraper plates 10, and the connecting block 21 is fixedly connected to the scraper plates 10. An axle pin 22 is arranged between the connecting block 21 and the rake arm 9, and the connecting block 21 is rotatably connected to the rake arm 9 through the axle pin 22. The scraper plates 10 are rotatably connected to the rake arm 9 through the connecting block 21 and the axle pin 22, so that the damaged scraper plates 10 can be replaced conveniently.

[0035] See also Figure 5 A spring 23 is provided on one side of the scraper plate 10, and the two ends of the spring 23 are fixedly connected to the rake arm 9 and the scraper plate 10 respectively. The spring 23 applies a pulling force to one end of the installed scraper plate 10, so that the scraper plate 10 is in close contact with the bottom of the concentrator body 1, ensuring the scraping effect, and also making the installed scraper plate 10 have a buffering effect.

[0036] See also Figure 1 A guardrail 4 is arranged above the walking beam frame 2, two guardrails 4 are arranged, and the guardrails 4 are fixedly connected to the walking beam frame 2, and the two guardrails 4 are arranged on both sides of the first motor 3, and the guardrails 4 play a protective role from both sides of the walking beam frame 2.

[0037] See also Figure 1 and Figure 2 A detection component 26 is provided below the walking beam frame 2, and the detection component 26 is fixedly connected to the walking beam frame 2. The detection component 26 is arranged on one side of the rotating shaft 15. An alarm 27 is provided on one side of the guardrail 4, and the alarm 27 is fixedly connected to the guardrail 4. The detection component 26 and the alarm 27 are linked together. The motion parameters of the rotating shaft 15 are detected by the detection component 26, and the alarm 27 is triggered to sound an alarm when the rotating shaft 15 is underspeed or stops.

[0038] Working principle: Turn on the first motor 3 to drive the rotating shaft 15 to rotate. As the rotating shaft 15 rotates, the rake arm 9 rotates. The rotating rake arm 9 drives the scraper 10 to move along the bottom of the thickener body 1, and transfers the sludge at the bottom of the thickener body 1 to the mud discharge pipe 5. Turn on the second motor 7 to drive the bevel gear 24 to rotate. The rotating bevel gear 24 indirectly drives the discharge auger 14 to rotate. The sludge in the mud discharge pipe 5 is discharged through the rotating discharge auger 14, which can avoid the mud discharge pipe 5 from being blocked; the hydraulic cylinder 17 drives the first connecting plate 8 to rise and fall along the rotating shaft 15 As the first connecting plate 8 is lifted and lowered, the pull rod 12 is driven to rotate, and then the rake arm 9 is driven to rotate, the inclination of the installed rake arm 9 is changed, and the distance between the scraper plate 10 and the bottom of the concentrator body 1 changes. By successively reducing the inclination of the rake arm 9, the sludge at the bottom of the concentrator body 1 can be better cleaned, which can prevent the sludge at the bottom of the concentrator body 1 from accumulating too quickly and jamming the rake arm 9. The detection component 26 detects the motion parameters of the rotating shaft 15. When the rotating shaft 15 is underspeed or stops, the alarm 27 is triggered to sound an alarm, thereby improving the safety of the concentrator.

[0039] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concentrator with high safety, comprising a concentrator body (1), characterized in that: Also includes: A beam frame (2) is arranged above the concentrator body (1), and the beam frame (2) is fixedly connected to the concentrator body (1); a first motor (3) is arranged above the beam frame (2), and the first motor (3) is connected to the beam frame (2) by screws; a rotating shaft (15) is arranged inside the concentrator body (1), and one end of the rotating shaft (15) is connected to the output end of the first motor (3); a second connecting disk (13) is arranged at the lower end of the rotating shaft (15), and the second connecting disk (13) is fixedly connected to the rotating shaft (15); rake arms (9) are arranged on both sides of the second connecting disk (13); two rake arms (9) are arranged, and one end of the two rake arms (9) is rotatably connected to the second connecting disk (13); and a mud scraper (10) is arranged below the two rake arms (9); A first connecting disk (8) is arranged outside the rotating shaft (15), a through hole (18) is arranged at the center of the first connecting disk (8), the rotating shaft (15) and the through hole (18) are arranged to be connected, and the rotating shaft (15) and the first connecting disk (8) are slidably connected, a hinge seat (11) is arranged above one end of each of the two rake arms (9), and the hinge seat (11) is fixedly connected to the rake arm (9), a pull rod (12) is arranged between the first connecting disk (8) and the hinge seat (11), two pull rods (12) are provided, and the two ends of the two pull rods (12) are rotatably connected to the first connecting disk (8) and the hinge seat (11) respectively; A fixed seat (16) is arranged outside the rotating shaft (15), and the fixed seat (16) is fixedly connected to the rotating shaft (15). The fixed seat (16) is arranged above the first connecting plate (8). A hydraulic cylinder (17) is arranged between the fixed seat (16) and the first connecting plate (8). Two hydraulic cylinders (17) are provided, and two ends of the hydraulic cylinder (17) are respectively fixedly connected to the first connecting plate (8) and the fixed seat (16). The two hydraulic cylinders (17) are arranged on both sides of the rotating shaft (15).

2. A highly safe concentrator according to claim 1, characterized in that: A slide groove (20) is provided on the side wall of the rotating shaft (15), two slide grooves (20) are provided, and the two slide grooves (20) are provided on both sides of the rotating shaft (15), a slider (19) is provided inside the through hole (18), two sliders (19) are provided, and the slider (19) is fixedly connected to the first connecting plate (8), the slider (19) is provided inside the slide groove (20), and the slider (19) is slidably connected to the rotating shaft (15).

3. A highly safe concentrator according to claim 1, characterized in that: A mud discharge pipe (5) is provided at the center of the lower end of the thickener body (1), and the mud discharge pipe (5) and the thickener body (1) are arranged as a whole. A discharge auger (14) and a horizontal plate (25) are provided inside the mud discharge pipe (5), and the horizontal plate (25) is fixedly connected to the mud discharge pipe (5). The discharge auger (14) is rotatably connected to the horizontal plate (25). A bevel gear (24) is provided below the discharge auger (14), and two bevel gears (24) are provided, and the two bevel gears (24) are meshed and connected. A mounting frame (6) is provided on one side of the mud discharge pipe (5), and the mounting frame (6) is fixedly connected to the thickener body (1). A second motor (7) is provided below the mounting frame (6), and the second motor (7) is connected to the mounting frame (6) by screws. The two bevel gears (24) are respectively connected to the output end of the second motor (7) and one end of the discharge auger (14).

4. A highly safe concentrator according to claim 1, characterized in that: The scraper plates (10) arranged below the two rake arms (9) are staggered, and the scraper plates (10) are in contact with the bottom of the concentrator body (1); a connecting block (21) is arranged above the scraper plates (10), and the connecting block (21) is fixedly connected to the scraper plates (10); an axle pin (22) is arranged between the connecting block (21) and the rake arms (9), and the connecting block (21) and the rake arms (9) are rotatably connected via the axle pin (22).

5. A highly safe concentrator according to claim 4, characterized in that: A spring (23) is provided on one side of the scraper blade (10), and two ends of the spring (23) are respectively fixedly connected to the rake arm (9) and the scraper blade (10).

6. A highly safe concentrator according to claim 1, characterized in that: A guardrail (4) is arranged above the walking beam frame (2), two guardrails (4) are arranged, and the guardrails (4) are fixedly connected to the walking beam frame (2), and the two guardrails (4) are arranged on both sides of the first motor (3).

7. A highly safe concentrator according to claim 6, characterized in that: A detection component (26) is provided below the walking beam frame (2), and the detection component (26) is fixedly connected to the walking beam frame (2); the detection component (26) is arranged on one side of the rotating shaft (15); an alarm (27) is provided on one side of the guardrail (4), and the alarm (27) is fixedly connected to the guardrail (4); the detection component (26) and the alarm (27) are arranged in linkage.