Torque overload limiting protection device for centrifugal centrifuge

Abstract

The utility model discloses a torque overload limiting protection device for a centrifugal centrifuge, and relates to the technical field of centrifuges. The device comprises a motor and a differential mechanism, a connecting shaft is installed on an output shaft of the motor, thread shearing grooves are symmetrically formed in the connecting shaft, and a moving mechanism is arranged on one side of the connecting shaft. When equipment such as a centrifugal machine encounters torque overload conditions, the torque acting on the connecting shaft and the threaded safety pin is increased instantly, namely the maximum torque value which can be borne by the threaded safety pin is determined according to the torque overload condition of the centrifugal machine in the normal use process of the centrifugal machine. Reasonable setting is carried out after factors such as stable operation and no damage of equipment are fully considered, when the torque exceeds the shearing strength of the threaded safety pin, the threaded safety pin can be sheared off at the threaded shearing groove, after the threaded safety pin is sheared off, power connection between the moving mechanism and the connecting shaft is interrupted, and the function of overload protection of the centrifugal machine for the first time is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of centrifuge technology, and specifically relates to a torque overload limit protection device for centrifuges. Background Technology

[0002] In today's industrial production, centrifuges, as key equipment that utilizes centrifugal force to achieve efficient separation or concentration of materials, are widely used in many important industries such as resource development, petrochemicals, and waste treatment. With their significant advantages such as compact structure, small size, high separation efficiency, large production capacity, and few auxiliary equipment, they play an irreplaceable role in industrial processes.

[0003] When a centrifuge encounters torque overload, without effective protection measures, it may cause the motor to burn out, transmission components to be damaged, or even the entire centrifuge equipment to be severely damaged, thereby affecting the continuity of production and causing huge economic losses. For example, in some chemical production processes, due to changes in material properties or improper process operation, the torque of the centrifuge may momentarily exceed its rated load range.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a torque overload limit protection device for centrifugal centrifuges to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a torque overload limit protection device for a centrifuge, comprising a motor and a differential. A connecting shaft is mounted on the output shaft of the motor, and symmetrically threaded shear grooves are formed inside the connecting shaft. A moving mechanism is provided on one side of the connecting shaft, and threaded safety pins are symmetrically threaded inside the moving mechanism. An elastic mechanism is provided between the moving mechanism and the motor, and multiple ball bearings are mounted on the side of the elastic mechanism near the moving mechanism. The multiple ball bearings abut against one side of the moving mechanism. The threaded safety pins can be installed into the threaded shear grooves. A flange is mounted on one end of the moving mechanism, and the output shaft of the differential is mounted on the central axis of the flange. A mounting rod is fixedly mounted on the motor, and a proximity switch is mounted on the end of the mounting rod near the moving mechanism, with the proximity switch abutting against one side of the moving mechanism.

[0008] Furthermore, the moving mechanism includes a moving plate, and the moving plate has symmetrically opened threaded placement holes inside.

[0009] Furthermore, the plurality of the ball bearings abut against one side of the movable plate, and the proximity switch also abuts against one side of the movable plate.

[0010] Furthermore, a plurality of sliding rods are mounted on the movable plate, and the plurality of sliding rods are slidably mounted on the flange.

[0011] Furthermore, a bolt rod is fixedly installed at one end of each of the plurality of sliding rods, and a nut is installed on the thread of the bolt rod on one side of the flange.

[0012] Furthermore, the threaded safety pin includes a pin head, one end of which is fixedly mounted with a first threaded pin rod, the other end of which is fixedly mounted with a torsion pin rod, and the other end of which is fixedly mounted with a second threaded pin rod.

[0013] Furthermore, the diameter of the torsion pin is smaller than the diameters of the first threaded pin and the second threaded pin, and the middle part of the torsion pin is located in the gap between the connecting shaft and the moving plate.

[0014] Furthermore, the pin head and the first threaded pin may be located within the threaded placement hole, and the second threaded pin may be located within the threaded shear groove.

[0015] Furthermore, the elastic mechanism includes a connecting plate, one end of which is fixedly mounted on the motor, and a spring is fixedly mounted on the end of the connecting plate away from the motor.

[0016] Furthermore, a ball bearing plate is fixedly mounted on the other end of the spring, and a plurality of balls are mounted on the ball bearing plate.

[0017] This utility model has the following beneficial effects:

[0018] When centrifuges and other equipment encounter torque overload, the torque acting on the connecting shaft and the threaded safety pin increases instantaneously, reaching the maximum torque value that the threaded safety pin can withstand. This maximum torque value is reasonably set based on factors such as stable operation and no damage during normal use of the centrifuge. When the torque exceeds the shear strength of the threaded safety pin, it will be sheared at the thread shear groove. After the threaded safety pin is sheared, the power connection between the moving mechanism and the connecting shaft is interrupted, thus providing the first-time overload protection function for the centrifuge.

[0019] In this invention, the moving mechanism is no longer constrained by the threaded safety pin in the horizontal direction, and the elastic mechanism is no longer compressed. Subsequently, the elastic potential energy inside the elastic mechanism is released, pushing multiple balls and the moving mechanism to move away from the motor. The multiple balls installed near the moving mechanism reduce the friction between the moving mechanism and the elastic mechanism during the rotation of the moving mechanism, so that the moving mechanism will not drive the elastic mechanism to rotate. As the moving mechanism moves, it gradually moves away from the normally open proximity switch. The moving mechanism and the flange are slidably connected. When the moving mechanism leaves the detection range of the proximity switch, the contacts of the proximity switch change from closed to open, and the circuit stops conducting. Subsequently, the change in the state of the proximity switch sends a signal to the control system. After receiving the signal, the control system determines that the equipment is overloaded and takes corresponding protective measures, such as immediately stopping the operation of the motor, to avoid further damage to the equipment and prevent more serious production accidents and economic losses caused by overload. This serves as a second overload protection function for the centrifuge.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall moving mechanism and a partial schematic diagram of the differential of this utility model;

[0024] Figure 3 This is a schematic diagram of the overall elastic mechanism of this utility model;

[0025] Figure 4 This is a partial sectional view of the movable plate and a partial sectional view of the connecting shaft of this utility model;

[0026] Figure 5 For the present utility model Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 This is a schematic diagram of the threaded safety pin of this utility model.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Motor; 2. Differential; 3. Connecting shaft; 301. Threaded shear groove; 4. Moving mechanism; 401. Moving plate; 402. Threaded placement hole; 403. Sliding rod; 404. Bolt rod; 405. Nut; 5. Threaded safety pin; 501. Pin head; 502. First threaded pin; 503. Torn pin; 504. Second threaded pin; 6. Elastic mechanism; 601. Connecting plate; 602. Spring; 603. Ball bearing plate; 7. Ball bearing; 9. Flange; 10. Mounting rod; 11. Proximity switch. Detailed Implementation

[0030] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0032] Please see Figures 1-6 As shown, this utility model is a torque overload limit protection device for a centrifuge, including a motor 1 and a differential 2. A connecting shaft 3 is installed on the output shaft of the motor 1. The connecting shaft 3 has symmetrically opened threaded shear grooves 301. A moving mechanism 4 is provided on one side of the connecting shaft 3. Threaded safety pins 5 are symmetrically threaded inside the moving mechanism 4. An elastic mechanism 6 is provided between the moving mechanism 4 and the motor 1. Multiple balls 7 are installed on the side of the elastic mechanism 6 near the moving mechanism 4, and the multiple balls 7 abut against one side of the moving mechanism 4. The threaded safety pins 5 can be installed into the threaded shear grooves 301. A flange 9 is installed at one end of the moving mechanism 4. The output shaft of the differential 2 is installed on the central axis of the flange 9. An mounting rod 10 is fixedly installed on the motor 1. A proximity switch 11 is installed on the end of the mounting rod 10 near the moving mechanism 4, and the proximity switch 11 abuts against one side of the moving mechanism 4.

[0033] Preface: The proximity switch 11 will be normally open. Its principle is as follows: when no object is detected approaching, the output contact of the proximity switch is in the open state and the circuit is not connected; when an object enters the detection area, the contact closes, the circuit is connected, and a signal is sent.

[0034] Power transmission: Under normal operating conditions, motor 1 starts and transmits power to moving mechanism 4 through connecting shaft 3 installed on the output shaft and threaded safety pin 5. Threaded safety pin 5, which is symmetrically threaded inside moving mechanism 4, is inserted into the symmetrically opened threaded shearing grooves 301 inside connecting shaft 3, realizing power transmission between motor 1 and moving mechanism 4. Flange 9 installed at one end of moving mechanism 4 is connected to the output shaft of differential 2, thereby further transmitting power to differential 2 to drive equipment such as centrifuges to operate normally. At this time, normally open proximity switch 11 at one end of mounting rod 10 installed on motor 1 abuts against one side of moving mechanism 4. Since moving mechanism 4 is in normal operating position, proximity switch 11 does not detect the object leaving and remains closed. The entire circuit is conductive, the equipment operation signal is transmitted normally, the system is in a stable operating state, and elastic mechanism 6 is compressed by moving mechanism 4.

[0035] When a centrifuge or similar equipment experiences a torque overload, the torque acting on the connecting shaft 3 and the threaded safety pin 5 increases instantaneously, reaching the maximum torque value that the threaded safety pin 5 can withstand. This maximum torque value is reasonably set based on factors such as stable operation and preventing damage during normal use of the centrifuge. When the torque exceeds the shear strength of the threaded safety pin 5, it will be sheared at the threaded shear groove 301. After the threaded safety pin 5 is sheared, the power connection between the moving mechanism 4 and the connecting shaft 3 is interrupted, serving as the first overload protection function for the centrifuge. Subsequently, the moving mechanism 4 is no longer restrained by the threaded safety pin 5 in the horizontal direction, and the elastic mechanism 6 is no longer compressed. The elastic potential energy inside the elastic mechanism 6 is then released, pushing multiple balls 7 and the moving mechanism 4 to move away from the motor 1. Multiple ball bearings 7 installed near the moving mechanism 4 on the elastic mechanism 6 reduce the friction between the moving mechanism 4 and the elastic mechanism 6 during the rotation of the moving mechanism 4, preventing the moving mechanism 4 from driving the elastic mechanism 6 to rotate. As the moving mechanism 4 moves, it gradually moves away from the normally open proximity switch 11. The moving mechanism 4 is slidably connected to the flange 9. When the moving mechanism 4 leaves the detection range of the proximity switch 11, the contacts of the proximity switch 11 change from closed to open, and the circuit stops conducting. Subsequently, the change in the state of the proximity switch 11 sends a signal to the control system. After receiving the signal, the control system determines that the equipment is overloaded and takes corresponding protective measures, such as immediately stopping the operation of the motor 1, to avoid further damage to the equipment and prevent more serious production accidents and economic losses caused by overload. This serves as a second overload protection function for the centrifuge.

[0036] In one embodiment, the moving mechanism 4 includes a moving plate 401, and the moving plate 401 has symmetrically opened threaded placement holes 402 inside.

[0037] The plurality of the ball bearings 7 abut against one side of the movable plate 401, and the proximity switch 11 also abuts against one side of the movable plate 401.

[0038] The movable plate 401 is equipped with a plurality of sliding rods 403, which are slidably mounted on the flange 9.

[0039] Each of the sliding rods 403 has a bolt rod 404 fixedly installed at one end, and a nut 405 is installed on the thread of the bolt rod 404 and on one side of the flange 9.

[0040] The threaded safety pin 5 includes a pin head 501, one end of which is fixedly mounted with a first threaded pin rod 502, the other end of which is fixedly mounted with a torsion pin rod 503, and the other end of which is fixedly mounted with a second threaded pin rod 504.

[0041] The diameter of the torsion pin 503 is smaller than that of the first threaded pin 502 and the second threaded pin 504, and the middle part of the torsion pin 503 is located in the gap between the connecting shaft 3 and the moving plate 401.

[0042] The pin head 501 and the first threaded pin 502 can be located in the threaded placement hole 402, and the second threaded pin 504 can be located in the threaded shearing groove 301.

[0043] The elastic mechanism 6 includes a connecting plate 601, one end of which is fixedly mounted on the motor 1, and a spring 602 is fixedly mounted on the end of the connecting plate 601 away from the motor 1.

[0044] The other end of the spring 602 is fixedly mounted with a ball bearing plate 603, and a plurality of balls 7 are mounted on the ball bearing plate 603.

[0045] Working principle: When the centrifuge and other equipment are running normally, the motor 1 starts, and its output shaft drives the connecting shaft 3 to rotate. The moving plate 401 can be slidably connected to the flange 9 by means of multiple sliding rods 403, and the sliding range of the moving plate 401 is limited by bolt rods 404 and nuts 405. The first threaded pin 502 is threaded in the threaded placement hole 402, and the second threaded pin 504 is threaded in the threaded shear groove 301. The first threaded pin 502, the second threaded pin 504, and the torsion pin 503 serve to connect the connecting shaft 3 and the moving plate 401. The power of the motor 1 can be transmitted to the moving plate 401 through the connecting shaft 3 and the threaded safety pin 5, and then through the flange. The disc 9 transmits power to the differential 2, thereby driving the equipment to operate. The connecting plate 601 is fixed on the motor 1. The spring 602 is in a compressed state by the moving plate 401. One end of the spring 602 is connected to the connecting plate 601, and the other end is connected to the ball plate 603. Multiple balls 7 are installed on the ball plate 603 and abut against one side of the moving plate 401. When the moving plate 401 rotates, the moving plate 401 can drive the multiple balls 7 to rotate, but the ball plate 603 does not rotate with it. The normally open proximity switch 11 abuts against one side of the moving plate 401. Since the moving plate 401 is in the normal working position, the proximity switch 11 remains closed, so that the circuit connected to it is connected, and the control system of the equipment can receive the signal of normal operation.

[0046] When a centrifuge or other equipment experiences torque overload, the torque acting on the connecting shaft 3 and the threaded safety pin 5 increases instantaneously. Since the diameter of the torsion pin 503 is smaller than that of the first threaded pin 502 and the second threaded pin 504, the structural strength at this point is relatively weak. When the torque exceeds the maximum value that the torsion pin 503 can withstand, it will break. After the torsion pin 503 breaks, the power connection between the connecting shaft 3 and the moving plate 401 is severed, serving as the first-stage centrifuge overload protection function. At this time, under the elastic potential energy of the spring 602, the ball bearing plate 603 and its balls 7 are pushed, thereby causing the moving plate 401 to... Sliding along the sliding rod 403 away from the motor 1, the moving plate 401 gradually moves away from the proximity switch 11. When the moving plate 401 leaves the detection range of the proximity switch 11, the contacts of the normally open proximity switch 11 change from closed to open, and the connected circuit stops conducting. The change in the state of the proximity switch 11 sends a signal to the control system of the equipment. After receiving the signal, the control system determines that the equipment is overloaded and takes corresponding protective measures, such as immediately stopping the operation of the motor 1, thereby preventing the equipment from suffering further damage due to overload, and playing the function of secondary centrifuge overload protection.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A centrifugal centrifuge torque overload limiting protection device, comprising a motor (1) and a differential (2), a connecting shaft (3) is installed on the output shaft of the motor (1), characterized in that: The connecting shaft (3) is symmetrically provided with a threaded shear groove (301) inside, one side of the connecting shaft (3) is provided with a moving mechanism (4), the moving mechanism (4) is symmetrically provided with a threaded safety pin (5) inside, the moving mechanism (4) and the motor (1) are provided with an elastic mechanism (6), the elastic mechanism (6) is provided with a plurality of ball bearings (7) close to the moving mechanism (4), the threaded safety pin (5) can be installed into the threaded shear groove (301), one end of the moving mechanism (4) is provided with a flange (9), the differential (2) output shaft is installed on the flange (9) axis, the motor (1) is fixedly provided with a mounting rod (10), the mounting rod (10) is provided with a proximity switch (11) close to one end of the moving mechanism (4), and the proximity switch (11) is in contact with one side of the moving mechanism (4).

2. A centrifuge torque overload limiting protection device for a centrifuge according to claim 1, wherein The moving mechanism (4) comprises a moving plate (401), and the moving plate (401) is symmetrically provided with a threaded placement hole (402) inside.

3. A centrifuge torque overload limiting protection device for a centrifuge according to claim 2, wherein A plurality of ball bearings (7) are in contact with one side of the moving plate (401), and the proximity switch (11) is also in contact with one side of the moving plate (401).

4. A centrifuge torque overload limiting protection device for a centrifuge according to claim 3, wherein A plurality of sliding rods (403) are installed on the moving plate (401).

5. A centrifuge torque overload limiting protection device for a centrifuge according to claim 4, wherein One end of each of the plurality of sliding rods (403) is fixedly provided with a bolt rod (404), and the bolt rod (404) is provided with a nut (405) on one side of the flange (9).

6. A centrifuge torque overload limiting protection device for a centrifuge according to claim 3, wherein The threaded safety pin (5) comprises a pin head (501), one end of the pin head (501) is fixedly provided with a first threaded pin rod (502), the other end of the first threaded pin rod (502) is fixedly provided with a torsion break pin rod (503), and the other end of the torsion break pin rod (503) is fixedly provided with a second threaded pin rod (504).

7. A centrifuge torque overload limiting protection device for a centrifuge according to claim 6, wherein The diameter of the torsion break pin rod (503) is smaller than the diameters of the first threaded pin rod (502) and the second threaded pin rod (504), and the torsion break pin rod (503) is located in the gap between the connecting shaft (3) and the moving plate (401).

8. A centrifuge torque overload limiting protection device for a centrifuge according to claim 6, wherein The pin head (501) and the first threaded pin rod (502) can be located in the threaded placement hole (402), and the second threaded pin rod (504) can be located in the threaded shear groove (301).

9. A centrifuge torque overload limiting protection device for a centrifuge according to claim 1, wherein The elastic mechanism (6) comprises a connecting plate (601), one end of the connecting plate (601) is fixedly installed on the motor (1), and the other end of the connecting plate (601) away from the motor (1) is fixedly provided with a spring (602).

10. A centrifuge torque overload limiting protection device for a centrifuge according to claim 9, wherein The other end of the spring (602) is fixedly provided with a ball bearing plate (603), and a plurality of ball bearings (7) are installed on the ball bearing plate (603).

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