Single motor centrifuge differential overload protection device and centrifuge

Abstract

The utility model discloses a purpose lies in providing a single motor centrifuge differential mechanism overload protection device and centrifuge belong to horizontal spiral centrifuge equipment technical field. It includes input shaft, and the input shaft is sleeved with overload body, outer yoke disc and connecting body, and is equipped with the transmission force steel ball between overload body and outer yoke disc, and is equipped with bearing seat on connecting body, and is equipped with butterfly spring between outer yoke disc and connecting body, and bearing seat is installed on the frame through fixed plate, and the outer yoke disc one side close to overload body is equipped with a trigger lever, and the top of trigger lever is arranged at the one side of outer yoke disc, and the middle part is hinged on the frame through pin shaft, and the bottom is arranged at the position corresponding with the trigger point of travel switch. The utility model through the common effect of fixed bearing seat and the overload protection structure that is composed of trigger lever and travel switch, conveniently realized the overload protection of single motor centrifuge, simple structure, stable performance, low cost.

Description

Technical Field

[0001] This utility model relates to the technical field of horizontal spiral centrifuge equipment, specifically to an overload protection device for the differential gear of a single-motor centrifuge and the centrifuge itself. Background Technology

[0002] As is well known, because the feeding of a screw centrifuge is continuous, in order to achieve the function of continuous material processing, the differential speed between the drum and the screw pusher must also be continuous. This differential speed is generated by the differential gear. During the normal operation of the centrifuge, if the centrifuge is overloaded or the screw pusher is accidentally jammed, it will directly lead to damage to the differential gear and the screw pusher. Therefore, many researchers have explored the protection of the differential gear.

[0003] Patent document CN202151598U discloses a horizontal screw centrifuge with an oil-type differential. When the centrifuge is overloaded, the steel ball in the jaw cam slides out of the force transmission hole of the pressure cap under the action of the overload force. Under the action of the spring force of the disc spring group, it continues to slide to the lowest point of the pressure cap, that is, the jaw cam moves to the left. The jaw cam disengages from the force transmission pin of the auxiliary pulley, and the auxiliary pulley is in an idling state, thereby protecting the differential and the screw feeder from damage.

[0004] Patent document CN11648307A discloses a differential protection device for a horizontal screw conveyor. It features a V-groove on the end face of the pulley, and a safety disc connected to the pulley via a steel ball engaging with the V-groove. The raised design of the safety disc prevents the steel ball from slipping out of the device. Simultaneously, a disc spring is located on the other side of the safety disc. When the axial force from the torque generated by the pulley's rotation exceeds the pressure of the disc spring on the steel ball, the steel ball slips out, disengaging the safety disc from the safety seat, causing the pulley to idle and preventing differential malfunction. Simultaneously, the safety disc moves to a proximity switch, which transmits a signal to the control cabinet to shut down the feeding system, further ensuring the safe operation of the differential.

[0005] While the aforementioned existing technologies disclose centrifuge differential protection devices with different structures, they are all differential protection devices for dual-motor centrifuges. That is, the differential housing and drum are driven by the main motor, while the input shaft of the differential is driven by the auxiliary motor. There is an urgent need to develop a single-motor centrifuge differential protection device and a centrifuge itself. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an overload protection device for the differential of a single-motor centrifuge. Through the combined action of the fixed bearing seat and the overload protection structure composed of a trigger rod and a limit switch, it can conveniently realize the overload protection of a single-motor centrifuge. It has a simple structure, stable performance, and low cost.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an overload protection device for a differential gear of a single-motor centrifuge, comprising an input shaft, a carrier, an outer shift fork, and a connecting body sleeved on the input shaft, a force-transmitting steel ball between the carrier and the outer shift fork, a bearing seat sleeved on the connecting body, and a butterfly spring between the outer shift fork and the connecting body, characterized in that: the bearing seat is mounted on the frame via a fixing plate, a trigger rod is provided on the side of the outer shift fork near the carrier, the top of the trigger rod is located on one side of the outer shift fork, the middle part is hinged to the frame via a pin, and the bottom is located at a position corresponding to the trigger point of the limit switch.

[0008] As an improvement of this utility model, the limit switch is mounted on the frame via a switch mounting plate, and the switch mounting plate is provided with a limit bolt for adjusting the trigger distance.

[0009] As an improvement of this utility model, the fixing plate has an L-shaped structure, and its bottom is provided with a limiting groove for limiting the offset distance of the trigger rod.

[0010] As an improvement of this utility model, the top of the trigger rod is provided with a trigger wheel, and the trigger wheel is hinged to the trigger rod by a pin.

[0011] Another objective of this utility model is to provide a centrifuge, including a drum, a spiral pusher, a differential, a motor, and a differential overload protection device mounted on a frame. The motor drives the drum to rotate via a belt, and the differential overload protection device is the aforementioned differential overload protection device for a single-motor centrifuge. As an improvement of this utility model, one end of the differential is connected to the drum, and the other end is mounted on the frame through a fixing plate.

[0012] The beneficial effects of this utility model are as follows: This utility model provides an overload protection device for the differential of a single-motor centrifuge. By fixing the bearing seat on the frame, both the inner and outer shift fork discs are stationary during centrifuge operation. Under the action of the force transmission steel ball, the conveyor and input shaft are also stationary. Only when the centrifuge is overloaded or the screw pusher is accidentally jammed, the force transmission steel ball disengages from the force transmission hole of the conveyor under the action of the overload force and slides to the lowest point of the conveyor. At this time, the outer shift fork disc moves to the left under the action of the disc spring, disengaging from the inner shift fork disc and pushing the top of the trigger rod outward. This causes the bottom of the trigger rod to push the cam of the limit switch, causing the electrical control system to activate, cutting off the power supply, and stopping the entire machine from operating. This avoids damage to the centrifuge and differential. The device has a simple structure, stable performance, and low cost.

[0013] Furthermore, the limit switch is mounted on the frame via a switch mounting plate, which is equipped with a limit bolt for adjusting the trigger distance. The trigger distance between the trigger rod and the outer shift fork can be easily adjusted by adjusting the limit bolt; the structure is simple and the operation is convenient.

[0014] Furthermore, the fixing plate has an L-shaped structure, and its bottom is provided with a limiting groove to limit the offset distance of the trigger rod. The limiting groove conveniently limits the left and right offset distance of the trigger rod, avoiding damage to the limit switch due to excessive stroke. The structure is simple and easy to manufacture.

[0015] Furthermore, a trigger wheel is provided at the top of the trigger lever, and the trigger wheel is hinged to the trigger lever by a pin. The trigger wheel allows the outer shift fork to push the trigger lever more smoothly.

[0016] This utility model also provides a centrifuge, which includes the above-mentioned overload protection device for the differential speed of a single-motor centrifuge. Therefore, it has corresponding beneficial effects, as detailed in the preceding description, which will not be repeated here.

[0017] Furthermore, one end of the differential is connected to the drum, and the other end is mounted on the frame via a fixing plate. This design conveniently achieves overload protection for a single-motor centrifuge, with a simple structure and reliable performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the differential overload protection device in Embodiment 1 of this utility model; Figure 2 This is a partial cross-sectional view of the differential in Embodiment 1 of this utility model; Figure 3 This is a three-dimensional structural diagram of the centrifuge in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the planar structure of the centrifuge in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the differential overload protection device in Embodiment 2 of this utility model.

[0019] In the diagram, 1. Limit bolt; 2. Switch mounting plate; 3. Connecting plate; 4. Double ear plate; 5. Trigger rod; 6. Adjusting nut; 7. Pressure plate; 8. Transmission carrier; 9. Outer shift fork plate; 10. Inner shift fork plate; 11. Bearing seat; 12. Connecting body; 13. Left end cover; 14. Fixing plate; 15. Limit groove; 16. Limit switch; 17. Force transmission steel ball; 18. Disc spring; 19. Input shaft; 20. Sliding bearing; 21. Mounting beam; 22. Differential; 23. Drum; 24. Frame; 25. Belt; 26. Motor; 27. Trigger wheel. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] It should be noted that the directional terms such as up, down, left, right, top, middle, and bottom used in the embodiments of this utility model are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive. Example 1

[0022] like Figure 1 and Figure 2 As shown, an overload protection device for a differential gear of a single-motor centrifuge includes an input shaft 19. The input shaft 19 has a load carrier 8, an outer shift fork 9, and a connecting body 12. A force-transmitting steel ball 17 is provided between the load carrier 8 and the outer shift fork 9. A bearing seat 11 is fitted onto the connecting body 12. A disc spring 18 is provided between the outer shift fork 9 and the bearing seat 11. An inner shift fork 10 is provided between the outer shift fork 9 and the bearing seat 11. The right side of the inner shift fork 10 is connected to the bearing seat 11, and the left side is engaged with the outer shift fork 9. The outer shift fork 9 is fitted onto the input shaft 19 via a sliding bearing 20. The load carrier 8 is connected to the input end 19 via a flat key. A pressure plate 7 is provided on the left side of the load carrier 8, and the pressure plate 7 is connected to the input shaft 19 via an adjusting nut 6. The bearing housing 11 is mounted on the frame 24 via a fixing plate 14. A trigger rod 5 is provided on the side of the outer shift fork 9 near the carrier 8. In this embodiment, the trigger rod 5 is located on the left side of the outer shift fork 9, with its top positioned on one side of the outer shift fork 9, its middle portion hinged to the frame 24 via a pin, and its bottom positioned at the position corresponding to the trigger point of the limit switch 16. Preferably, the middle portion of the trigger rod 5 is hinged to the double ear plate 4 via a pin, and the double ear plate 4 is connected to the frame 24. Preferably, the fixing plate 14 has an L-shaped structure, with a limiting groove 15 at its bottom for limiting the offset distance of the trigger rod 5; the top of the fixing plate 14 has an arc-shaped groove that matches the bearing housing 11 and faces upwards; the outer side of the bearing housing 11 has threaded holes along the circumferential direction; the fixing plate 14 has threaded holes around the arc groove that match the threaded holes of the bearing housing; the bearing housing 11 and the fixing plate 14 are connected by bolts, resulting in a simple structure and easy manufacturing. To make the structure of the fixing plate 14 more robust, a connecting plate 3 supporting the fixing plate 14 is provided below the fixing plate 14. Preferably, the connecting plate 3 has an inverted U-shaped structure and is welded to the frame 4.

[0023] The limit switch 16 is mounted on the frame 24 via the switch mounting plate 2. The switch mounting plate 2 is provided with a limit bolt 1 for adjusting the trigger distance between the outer shift fork 9 and the trigger rod 5.

[0024] This invention fixes the bearing housing 11 to the frame 24, keeping both the inner and outer fork discs 10 and 9 stationary during centrifuge operation. Under the action of the force-transmitting steel ball 17, the carrier 8 and input shaft 19 are also stationary. Only when the centrifuge is overloaded or the screw pusher accidentally jams, the force-transmitting steel ball 17 disengages from the force-transmitting hole of the carrier 8 under the overload force, sliding to the lowest point of the carrier 8. At this time, the outer fork disc 9, under the action of the disc spring 18, moves to the left, disengaging from the inner fork disc 10 and pushing the top of the trigger rod 5 outward. This causes the bottom of the trigger rod 5 to push the cam of the limit switch 16, activating the electrical control system, cutting off the power, and stopping the entire machine. This avoids damage to the centrifuge and differential, resulting in a simple structure, stable performance, and low cost.

[0025] When the centrifuge is overloaded or the screw pusher is accidentally jammed, causing the input shaft 19 to rotate, the cause of the centrifuge overload or the screw pusher jamming must be analyzed. After the problem is solved, the centrifuge can be reinstalled. The specific installation steps are as follows: 1. Remove the adjusting nut 6 and the pressure plate 7, and remove the carrier 8 and the outer fork plate 9. The disc spring 18 does not need to be removed. 2. Align the outer fork plate 9 and the inner fork plate 10, and press the outer fork plate 9 into the fork opening of the inner fork plate 10 (make sure that the sliding bearing 20 in the outer fork plate 9 has not fallen off). 3. Install the key into the keyway in the carrier 8, align the key in the installed carrier 8 with the keyway of the input shaft 19, and at the same time align the steel ball groove of the carrier 8 with the ball bearing embedded in the outer fork plate 9 (if the two cannot be aligned at the same time, rotate the input shaft 19 so that the two can be aligned at the same time). 4. Finally, install the pressure plate 7 and screw the adjusting nut 6 into the input shaft 19.

[0026] In summary, since the differential speed is equal to the ratio of the difference between the drum speed and the screw pusher speed to the differential ratio, and since the differential ratio is a fixed value of the differential, when the input shaft 19 is in a non-stationary state due to centrifuge overload or accidental jamming of the screw pusher, the speed of the screw pusher will be affected, thus affecting the differential speed. This will prevent the preset separation effect from being achieved and may even cause damage to the centrifuge and differential. This embodiment effectively solves the above-mentioned technical problems through the overload protection device described above.

[0027] like Figure 3 and Figure 4 As shown, this embodiment also provides a centrifuge, including a drum 23 mounted on a frame 24, a screw pusher, a differential 22, a motor 26, and a differential overload protection device. The motor 26 drives the drum 23 to rotate via a belt 25. The outer shell of the drum 23 is connected to the outer shell of the differential 22. The differential overload protection device is the single-motor centrifuge differential overload protection device described above. Therefore, it has corresponding beneficial effects, which can be referred to in the previous description and will not be repeated here.

[0028] Preferably, the right end of the differential 22 is connected to the drum 23, and the left end is mounted on the mounting beam 21 of the frame 24 via a fixing plate 14. This design conveniently achieves overload protection for the single-motor centrifuge, with a simple structure and reliable performance. Example 2

[0029] like Figure 5 As shown, this embodiment differs from Embodiment 1 in that: a trigger wheel 27 is provided at the top of the trigger lever 5, and the trigger wheel 27 is hinged to the trigger lever 5 by a pin. The trigger wheel 27 allows the outer shift fork 9 to push the trigger lever 5 more smoothly.

[0030] The above provides a detailed description of the overload protection device for the differential gear of a single-motor centrifuge and the centrifuge itself, as provided by this utility model. Specific examples have been used to illustrate the technical principles and implementation methods of this utility model. The above embodiments are only used to help understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An overload protection device for a differential gear of a single-motor centrifuge, comprising an input shaft, a transmission carrier, an outer shift fork, and a connecting body sleeved on the input shaft, a force-transmitting steel ball disposed between the transmission carrier and the outer shift fork, a bearing seat sleeved on the connecting body, and a disc spring disposed between the outer shift fork and the connecting body, characterized in that: The bearing housing is mounted on the frame via a fixing plate. A trigger rod is provided on the side of the outer shift fork near the carrier. The top of the trigger rod is located on one side of the outer shift fork, the middle part is hinged to the frame via a pin, and the bottom is located at the position corresponding to the trigger point of the limit switch.

2. A single motor centrifuge differential over load protection device as claimed in claim 1 wherein: The limit switch is mounted on the frame via a switch mounting plate, which is provided with limit bolts for adjusting the trigger distance.

3. A single motor centrifuge differential over load protection device as claimed in claim 1 wherein: The fixing plate has an L-shaped structure, and its bottom is provided with a limiting groove for limiting the offset distance of the trigger rod.

4. A single motor centrifuge differential over load protection device as claimed in claim 1 wherein: The trigger rod is provided with a trigger wheel at its top, and the trigger wheel is hinged to the trigger rod by a pin.

5. A centrifuge comprising a bowl mounted on a frame, a screw conveyor, a differential, a motor and a differential overload protection, the motor driving the bowl in rotation through a belt, characterized in that: The differential overload protection device is the single-motor centrifuge differential overload protection device as described in any one of claims 1 to 4.

6. A centrifuge as claimed in claim 5, wherein: One end of the differential is connected to the drum, and the other end is mounted on the frame via a fixing plate.

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