Double-limiting protection device
By introducing the limit limit switch into the reactor limit protection device, the mechanical damage caused by limit detection delay is solved, and a timely protection mechanism is realized, and structural damage is avoided when the reactor core exceeds the limit.
Patent Information
- Application Number
- CN202422171344.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The limit detection method of existing reactor core delays feedback, resulting in damage to the mechanical structure, especially when moving outside the limit area, which may cause the core to be stuck and damage to the screw and lead assembly.
Add an extreme limit switch to the original limit protection device, and combine it with a normal limit switch to form a dual limit protection device to ensure timely feedback and power-off protection when the limit stroke exceeds.
Through the dual limit protection device, damage to the mechanical structure is avoided, ensuring that the reactor core stops in time when it moves outside the limit stroke, and protects the screw and lead assembly.
Smart Images
Figure CN223051982U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of limit protection devices, in particular to a double limit protection device. Background Technique
[0002] For the drive of the reactor core, a detection device with upper and lower limits and signal feedback is required. Usually, the distance of the reactor core movement is detected through a gear ratio. When the reactor moves to a certain position, it is necessary to feedback to the control system through a limit switch to stop its operation and only move in the reverse direction.
[0003] The existing reactor core has two positions through gear and chain drive, an upper limit and a lower limit. Often, this method will cause delayed feedback and slow stop, and in severe cases, it may damage the mechanical structure. For example, the movement space of the core can only be within this limit area, and exceeding it will cause the core to get stuck and damage the lead screw and lead screw assembly. To solve the above problems, a double limit protection device is proposed in this application. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a double limit protection device is proposed. An extreme limit switch is added on the original basis, and together with the original normal limit switch, it is called a double limit protection device, which can give timely feedback to avoid damage to the mechanical structure.
[0005] To achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A double limit protection device includes a housing. A first bearing seat is fixedly connected to the top of the housing. A sprocket shaft fixedly connected thereto penetrates through the first bearing seat. A sprocket is fixedly connected to the outer wall of the top of the sprocket shaft. The sprocket shaft penetrates through the housing and is rotatably connected thereto. A lead screw is coaxially fixedly connected to the bottom of the sprocket shaft. A connecting shaft is coaxially fixedly connected to the bottom of the lead screw. A bottom plate is fixedly connected to the bottom of the housing. A second bearing seat is fixedly connected to the top of the bottom plate. The connecting shaft is coaxially fixedly connected to the second bearing seat. A slider is sleeved on the outer wall of the lead screw and is threadedly connected thereto. Two connecting plates are fixedly connected to the outer wall of the slider. Two limit slots are penetrated and opened on the housing. The two connecting plates respectively penetrate through the limit slots and are slidably connected to their inner walls. Two normal limit switches are fixedly connected to the left side of the housing. Two extreme limit switches are fixedly connected to the right side of the housing.
[0007] Preferably, the first bearing seat includes a first inner ring and a first outer ring. The first outer ring is fixedly connected to the top of the housing. The first inner ring is fixedly connected to the outer wall of the sprocket shaft. The first inner ring is rotatably connected to the first outer ring.
[0008] Preferably, the second bearing housing includes a second inner ring and a second outer ring. The second outer ring is fixedly connected to the top of the bottom plate, the second inner ring is fixedly connected to the outer wall of the connecting shaft, and the second inner ring is rotatably connected to the second outer ring.
[0009] Preferably, an external thread is provided on the outer wall of the lead screw, a through hole is provided through the slider, and an internal thread matching the external thread is provided on the inner wall of the through hole.
[0010] Preferably, the distance between two limit limit switches on the same side is greater than the distance between two normal limit switches.
[0011] Preferably, both the normal limit switch and the limit limit switch are fixedly installed on the outer wall of the housing by bolts.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] When a fault occurs in the system or the normal limit switch is damaged, the limit limit switch will be triggered. Since the circuit of the motor is in series with the normally closed contacts of the limit limit at both ends, the circuit will be immediately powered off at this time to stop the motor from running, thus playing a key protective role and avoiding the problem of damaging the lead screw and the lead screw assembly due to exceeding the limit stroke.
[0014] In summary, a limit limit switch is added on the original basis, and together with the original normal limit switch, it is called a double-limit protection device, which can provide timely feedback to avoid damage to the mechanical structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 FIG. is a schematic structural diagram of a double-limit protection device proposed by the present utility model.
[0016] In the figure: 1 sprocket, 2 sprocket shaft, 3 first bearing housing, 4 housing, 5 lead screw, 6 connecting shaft, 7 second bearing housing, 8 slider, 9 connecting plate, 10 limit groove, 11 normal limit switch, 12 limit limit switch, 13 bottom plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0018] Refer to Figure 1, A double-limit protection device, including a housing 4. A first bearing seat 3 is fixedly connected to the top of the housing 4. A sprocket shaft 2 fixedly connected to it penetrates through the first bearing seat 3. The first bearing seat 3 includes a first inner ring and a first outer ring. The first outer ring is fixedly connected to the top of the housing 4, and the first inner ring is fixedly connected to the outer wall of the sprocket shaft 2. The first inner ring is rotatably connected to the first outer ring. A sprocket 1 is fixedly connected to the outer wall at the top of the sprocket shaft 2. The sprocket shaft 2 penetrates through the housing 4 and is rotatably connected to it. There is a motor arranged outside. The end of the output shaft of the motor is fixedly connected with a driving sprocket. A chain is sleeved on the outer walls of the driving sprocket and the sprocket 1. The sprocket 1 is driven to rotate and transmit by the motor.
[0019] A lead screw 5 is coaxially fixedly connected to the bottom of the sprocket shaft 2. A connecting shaft 6 is coaxially fixedly connected to the bottom of the lead screw 5. A bottom plate 13 is fixedly connected to the bottom of the housing 4. Four through holes are penetrated and opened on the bottom plate 13. The device can be installed and fixed through the cooperation of bolts and the through holes. A second bearing seat 7 is fixedly connected to the top of the bottom plate 13. The connecting shaft 6 is coaxially fixedly connected to the second bearing seat 7. The second bearing seat 7 includes a second inner ring and a second outer ring. The second outer ring is fixedly connected to the top of the bottom plate 13, and the second inner ring is fixedly connected to the outer wall of the connecting shaft 6. The second inner ring is rotatably connected to the second outer ring, which can make the lead screw 5 and the connecting shaft 6 rotate stably.
[0020] A slider 8 threaded on the outer wall of the lead screw 5 is sleeved on the outer wall of the lead screw 5. The outer wall of the lead screw 5 is provided with an external thread. A through port is penetrated through the slider 8. The inner wall of the through port is provided with an internal thread matching the external thread. Two connecting plates 9 are fixedly connected to the outer wall of the slider 8. Two limiting slots 10 are penetrated and opened on the housing 4. The two connecting plates 9 respectively penetrate through the limiting slots 10 and are slidably connected to their inner walls, which can limit the connecting plates 9 to make their lifting stable. Two normal limit switches 11 are fixedly connected to the left side of the housing 4. Two extreme limit switches 12 are fixedly connected to the right side of the housing 4. Telescopic columns are provided at the opposite ends of the two normal limit switches 11 and the extreme limit switches 12. When the connecting plate 9 contacts the telescopic column, the normal limit switch 11 or the extreme limit switch 12 is triggered.
[0021] The distance between the two extreme limit switches 12 on the same side is greater than the distance between the two normal limit switches 11. Both the normal limit switch 11 and the extreme limit switch 12 are installed and fixed to the outer wall of the housing 4 through bolts. The normal limit switch 11 should be triggered in advance. The installation positions of the two limits are 3 mm different. The normal limit switch 11 is triggered earlier than the extreme limit switch 12. When the normal limit switch 11 is triggered, the driving direction of the motor changes at this time. When the extreme limit switch 12 is triggered, the motor circuit is turned off at this time.
[0022] In this utility model, the output shaft of an external motor is connected with a driving sprocket. The driving sprocket is connected with sprocket 1 through a chain. The rotation of the output shaft of the external motor drives the driving sprocket, the chain, sprocket 1, sprocket shaft 2, lead screw 5, and connecting shaft 6 to rotate. The rotation of lead screw 5 drives the slider 8 and two connecting plates 9 to move up and down (the connecting plates 9 contact the inner wall of the limit groove 10 to limit the connecting plates 9 to move up and down). During the movement, for example, when moving down, the heights of the two connecting plates 9 are always the same. The left connecting plate 9 contacts the normal limit switch 11 which is 3MM higher, which can make the output shaft of the motor rotate reversely, so that the slider 8 and the connecting plates 9 move up to contact the normal limit switch 11, and the motor changes the rotation direction again; when a system failure occurs or the normal limit switch 11 is damaged, the extreme limit switch 12 will be triggered. Since the circuit of the motor is in series with the normally closed contacts of the extreme limits at both ends, the circuit will be immediately powered off at this time to stop the motor from running, thus playing a key protective role and avoiding the problem of damaging the lead screw and the lead screw assembly due to exceeding the limit stroke.
Claims
1. A double limit protection device, comprising a housing (4), characterized in that: The top of the housing (4) is fixedly connected to a first bearing seat (3), the first bearing seat (3) is penetrated by a sprocket shaft (2) fixedly connected thereto, the top outer wall of the sprocket shaft (2) is fixedly connected to a sprocket (1), the sprocket shaft (2) penetrates the housing (4) and is rotatably connected thereto, the bottom of the sprocket shaft (2) is coaxially fixedly connected to a screw rod (5), the bottom of the screw rod (5) is coaxially fixedly connected to a connecting shaft (6), the bottom of the housing (4) is fixedly connected to a bottom plate (13), the top of the bottom plate (13) is fixedly connected to a second shaft The support seat (7), the connecting shaft (6) is coaxially fixedly connected to the second bearing seat (7), the outer wall of the screw rod (5) is sleeved with a slider (8) threadedly connected thereto, the outer wall of the slider (8) is fixedly connected to two connecting plates (9), the shell (4) is provided with two limit grooves (10), the two connecting plates (9) respectively penetrate the limit grooves (10) and are slidably connected to the inner wall thereof, the left side of the shell (4) is fixedly connected to two normal limit switches (11), and the right side of the shell (4) is fixedly connected to two extreme limit switches (12).
2. A double limit protection device according to claim 1, characterized in that: The first bearing seat (3) comprises a first inner ring and a first outer ring, the first outer ring is fixedly connected to the top of the housing (4), the first inner ring is fixedly connected to the outer wall of the sprocket shaft (2), and the first inner ring is rotatably connected to the first outer ring.
3. A double limit protection device according to claim 1, characterized in that: The second bearing seat (7) comprises a second inner ring and a second outer ring, the second outer ring is fixedly connected to the top of the base plate (13), the second inner ring is fixedly connected to the outer wall of the connecting shaft (6), and the second inner ring is rotatably connected to the second outer ring.
4. A double limit protection device according to claim 1, characterized in that: The outer wall of the screw rod (5) is provided with an external thread, the slider (8) is provided with a through opening, and the inner wall of the through opening is provided with an internal thread matching the external thread.
5. A double limit protection device according to claim 1, characterized in that: The distance between the two extreme limit switches (12) on the same side is greater than the distance between the two normal limit switches (11).
6. A double limit protection device according to claim 1, characterized in that: The normal limit switch (11) and the extreme limit switch (12) are both mounted and fixed to the outer wall of the housing (4) by means of bolts.