Electronic low-rotating-speed overspeed switch
By using an electronic low-speed overspeed switch, which replaces the mechanical structure with a photoelectric encoder and optocoupler, high-precision speed detection and fast response are achieved. This solves the problems of slow response and large error of traditional overspeed switches, and provides automatic reset and multi-threshold protection functions.
Patent Information
- Application Number
- CN202520033709.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-08
AI Technical Summary
Traditional overspeed switches have slow response speed, large detection error, and cannot protect at low speeds. Furthermore, their mechanical structure is easily affected by environmental factors, making it impossible to achieve multi-threshold protection.
It adopts an electronic low-speed overspeed switch, and uses photoelectric encoder and optocoupler to replace the centrifugal mechanical structure. The speed is detected by encoder to realize detection within a single revolution, and multiple speed thresholds can be set.
It improves detection accuracy and response speed, achieves automatic reset, has a simple structure, low failure rate, adapts to various working conditions, and is suitable for multiple speed protection applications.
Smart Images
Figure CN223729733U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical control switch technical field especially relates to an electronic low speed overspeed switch. BACKGROUND
[0002] Overspeed switch is a kind of mechanical control switch commonly seen in crane device, mainly applied to the protection of motor speed in the descending process of lifting mechanism. The main shaft of switch is connected with motor rotating shaft, and the inside of switch is adjusted by the pre-pressure of spring, sets the speed action setting value, along with the continuous rise of motor speed, the weight in the inside of switch will overcome spring force and impact escapement rod to trigger the action of mechanical contact under the action of centrifugal force, and the contact completes system shutdown through the protection circuit connected in series in system to realize the protection function.
[0003] The traditional overspeed switch mainly completes the final contact action by the cooperation of mechanical structure, and its shortcomings are relatively obvious: since the overspeed switch relies on the action of centrifugal force to complete mechanical action, its response speed is slow, detection error is large, there is usually a ten percent offset, and the centrifugal force is too small to complete the movement of weight at low speed, which is the protection blind area of mechanical overspeed switch; after the completion of protection action of overspeed switch, manual reset is needed to continue working, which is relatively complicated in actual application; mechanical overspeed switch can only realize the speed protection of one speed section, and cannot complete multiple threshold protection, which has certain limitations; mechanical overspeed switch is affected by dust, lubrication, temperature and other factors, which can cause the phenomena of precision decline and service life reduction. CONTENT OF THE UTILITY MODEL
[0004] The utility model mainly solves the technical problems that the traditional overspeed switch relies on, its response speed is slow, detection error is large, there is offset, and protection action cannot be completed at low speed, and proposes an electronic low speed overspeed switch to improve detection precision and response speed, which can complete detection within a single circle.
[0005] The utility model provides an electronic low speed overspeed switch, which comprises a shaft, an end cover, an optoelectronic coupler, an optoelectronic code disc, a circuit board and a shell.
[0006] The end cover and the shell are connected into a machine shell by bolts;
[0007] The shaft is fixed on the machine shell and passes through the machine shell axially;
[0008] The optoelectronic code disc is fixed on the shaft by screws;
[0009] The optoelectronic coupler and the circuit board are fixed on the machine shell by screws respectively.
[0010] Preferably, the shaft is fixed on the casing through the first deep groove ball bearing and the second deep groove ball bearing.
[0011] Preferably, a cable joint is arranged on the casing.
[0012] The signal line enters the casing interior to be connected to the circuit board through the cable joint.
[0013] Preferably, a grounding screw is arranged on the casing.
[0014] Preferably, an O-shaped sealing ring is arranged at the joint of the end cover and the casing.
[0015] Preferably, an end cover sealing ring is arranged at the opening of the end cover.
[0016] The electronic low-speed overspeed switch is internally provided with a photoelectric encoder and a photoelectric coupler, adopts the working principle of the encoder to track and detect the speed, replaces the original centrifugal mechanical structure, has high detection precision and can complete the detection within a single circle; the mechanism is simple, the main shaft is supported at two ends by rolling bearings, the transmission level is small and the idle difference is not generated, so the response speed is fast, the speed signal can be quickly fed back to the automatic system to complete the protection action; compared with the centrifugal overspeed switch, the utility model does not have an escapement, directly collects the photoelectric encoder and can complete the automatic reset function, and can quickly reset to the working state after the speed returns to the normal value; after being integrated into the circuit system, the utility model can set multiple speed thresholds according to the working condition requirements of the user, and realizes the protection of multiple speeds. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 is a sectional view of the electronic low-speed overspeed switch provided by the utility model;
[0018] Fig. 2 is a side view of the electronic low-speed overspeed switch provided by the utility model.
[0019] Reference signs: 1, shaft; 2, end cover; 3, end cover sealing ring; 4, first deep groove ball bearing; 5, O-shaped sealing ring; 6, photoelectric coupler; 7, photoelectric encoder; 8, circuit board; 9, casing; 10, second deep groove ball bearing; 11, grounding screw; 12, cable joint; 13, signal line. DETAILED DESCRIPTION
[0020] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0021] like Figs. 1-2 As shown in the figure, an electronic low-speed overspeed switch provided by this utility model includes: a shaft 1, an end cover 2, an optocoupler 6, an optoelectronic code disk 7, a circuit board 8, and a housing 9.
[0022] The end cap 2 and the housing 9 are connected by bolts to form a machine housing; an O-ring seal 5 is provided at the connection between the end cap 2 and the housing 9. An end cap seal 3 is installed at the opening of the end cap 2. The machine housing has good sealing performance.
[0023] The shaft 1 is fixed to the housing and passes through the housing axially. Specifically, the shaft 1 is fixed to the housing by a first deep groove ball bearing 4 (deep groove ball bearing 6005Z) and a second deep groove ball bearing 10 (deep groove ball bearing 6202Z). Deep groove ball bearings are installed at both ends of the shaft 1 and fixed to the housing, forming a double-support point system with unidirectional fixation; the distance between the two deep groove ball bearings is 80mm.
[0024] The photoelectric encoder 7 is fixed to the shaft 1 by set screws; the optocoupler 6 and the circuit board 8 are respectively fixed to the housing by screws. Specifically, the photoelectric encoder 7 is fixed to the φ20mm step of the shaft 1 by set screws. The step is 20mm long, which allows the photoelectric encoder 7 to be adjusted to a suitable position.
[0025] Based on the above scheme, a cable connector 12 is installed on the housing; the signal line 13 enters the housing through the cable connector 12 and connects to the circuit board 8. A grounding screw 11 is installed on the housing.
[0026] This invention relates to an electronic low-speed overspeed switch. In operation, the input shaft of the rotating component being measured is connected to the keyway at the front end of shaft 1 via a coupling. The speed threshold should be set before operation. The input speed can be in the range of 1 r / min to 2000 r / min. During operation, the rotating component being measured drives shaft 1 to rotate at the same angular velocity, which in turn drives the photoelectric encoder 7 to rotate. The photoelectric encoder 7, fixed on shaft 1, and the photoelectric coupler 6, fixed on the housing, undergo relative displacement. The circuit board 8 then collects the light signal to calculate the speed and achieve control. When an overspeed occurs, the circuit board 8 sends a feedback signal to the protection system to protect the motor speed.
[0027] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the modification of the technical solutions recorded in the foregoing embodiments, or the equivalent replacement of part or all of the technical features, does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An electronic low speed over-speed switch, characterized in that The utility model relates to a kind of optical encoder, including: Shaft (1), end cover (2), photoelectric coupler (6), photoelectric code disc (7), circuit board (8) and shell (9); The end cover (2) and shell (9) are bolted into the casing; The shaft (1) is fixed on the casing and passes axially from the casing; The photoelectric code disc (7) is fixed on the shaft (1) by screw; The photoelectric coupler (6), circuit board (8) are respectively fixed on the casing by screw.
2. The electronic low revolution overspeed switch according to claim 1, wherein The shaft (1) is fixed on the casing by the first deep groove ball bearing (4) and the second deep groove ball bearing (10).
3. The electronic low revolution overspeed switch according to claim 1, wherein The cable connector (12) is installed on the casing; Signal line (13) enters the casing interior and is connected to circuit board (8) by cable connector (12).
4. The electronic low revolution overspeed switch according to claim 3, wherein The grounding screw (11) is installed on the casing.
5. The electronic low revolution overspeed switch according to claim 1, wherein O-shaped sealing ring (5) is arranged at the joint of the end cover (2) and shell (9).
6. The electronic low revolution overspeed switch according to claim 5, wherein End cover sealing ring (3) is installed at the opening of the end cover (2).