Permanent magnet magnetic base adsorption protection switch device
By using a mechanical adsorption protection switch device, which utilizes the linkage between the magnet and the switch rod, the problem of motor mis-start in permanent magnet base equipment is solved, and reliable adsorption detection and safe start-up are achieved in harsh environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG XINXING TOOLS CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-24
AI Technical Summary
Existing permanent magnet base equipment lacks a reliable adsorption detection device, leading to the safety hazard of motor mis-start, and electronic sensors are prone to failure in industrial environments.
A mechanical adsorption protection switch device is adopted. Through the linkage of the switch rod and the micro switch, the rotation of the magnet and the cooperation of opposite magnetic poles are used to realize the physical detection of the magnetic seat adsorption status, ensuring that the motor only starts when the magnetic seat is fully adsorbed.
It achieves reliable adsorption detection without circuit failure in industrial environments such as oil and dust, avoids motor misstart, and improves equipment safety.
Smart Images
Figure CN224554263U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent magnet base technology, and in particular to a permanent magnet base adsorption protection switch device. Background Technology
[0002] In permanent magnet magnetic base devices (such as magnetic drills and magnetic worktables), the device must be tightly adhered to the workpiece surface for the motor to start safely. Existing technologies suffer from two main drawbacks: First, the lack of an adsorption detection device: traditional magnetic bases rely on manual judgment of the adsorption state. If the operator accidentally starts the device when it is not fully adsorbed, the high-speed rotating motor can easily cause the device to detach. Second, insufficient reliability of electronic sensors: some improved solutions use Hall effect sensors to detect changes in magnetic flux, but these suffer from complex circuitry, high cost, and weak anti-interference capabilities, and are prone to failure in industrial environments with metal dust or oil contamination. Therefore, there is an urgent need for a purely mechanical, circuit-free, and highly reliable adsorption detection structure to physically eliminate the risk of accidental motor start-up. Utility Model Content
[0003] To address the safety hazard of motor misstart caused by the lack of reliable adsorption detection in existing technologies, this utility model proposes a permanent magnet magnetic base adsorption protection switch device.
[0004] The specific technical solution is as follows:
[0005] A permanent magnet magnetic base adsorption protection switch device includes: a body, a magnetic base, a switch push rod, a micro switch, and an elastic element;
[0006] The magnetic base is fixedly connected to the machine body. The magnetic base has a rotating cavity to accommodate the rotation of the magnet. The side of the magnetic base that is fixed to the machine body has a through hole to accommodate one end of the switch rod entering the rotating cavity.
[0007] The switch rod is located inside the machine body and is slidably connected to the machine body.
[0008] The micro switch is fixedly connected to the machine body. The moving contact of the micro switch is in contact with the other end of the switch rod. The micro switch has a height at which the other end of the switch rod just triggers the moving contact of the micro switch when the magnet pushes one end of the switch rod out of the rotating cavity when the magnetic base is attracted.
[0009] One end of the elastic element abuts against the machine body, and the other end of the elastic element is located at one end of the switch rod, used to push the other end of the elastic element into the rotating cavity. Whether the micro switch is triggered or not is a prerequisite for whether the motor can start. When the magnetic seat is attracted, the magnet inside the magnetic seat rotates and pushes the switch rod out of the rotating cavity, thereby contacting the moving contact of the micro switch and turning on the micro switch. At this time, the motor can be selected to start. When the magnetic seat is not attracted, the magnet inside the magnetic seat resets, and the gap between dissimilar magnets returns to the other end of the switch rod. Under the action of the elastic element, the switch rod returns to the rotating cavity, and the switch rod separates from the micro switch, thereby realizing the attraction protection of the permanent magnet seat.
[0010] Furthermore, the rotating cavity is equipped with a pair of magnets, which consists of two dissimilar magnets symmetrically arranged within the rotating cavity. A gap is provided between the two dissimilar magnets in the pair to accommodate one end of the switch rod when the magnetic base is not attracted. When the magnetic base is not attracted, one end of the switch rod falls into the gap between the dissimilar magnets, and the other end of the switch rod separates from the microswitch.
[0011] Furthermore, one end of the switch rod is provided with a flange step. The flange step is at the same distance from one end of the switch rod as the magnetic base when one end of the switch rod is pushed into the rotating cavity and the other end of the switch rod is separated from the moving contact of the microswitch. The flange step prevents the switch rod from falling into the magnetic base. When the magnetic base is not attracted, one end of the switch rod is pushed into the rotating cavity, the flange step abuts against the magnetic base, and the switch rod is in a separated state from the microswitch.
[0012] Furthermore, the elastic element is disposed between the body and the flange step. The elastic element causes the switch push rod to generate a spring force against the magnetic seat. When the magnetic seat is not attracted, the switch push rod will not trigger the micro switch; when the magnetic seat changes from the attracted state to the unattracted state, the switch push rod can be pushed back into the rotating cavity by the elastic element and separated from the micro switch.
[0013] Furthermore, the fixed side of the body and the magnetic base is provided with a countersunk hole, and the elastic element is provided in the countersunk hole of the body.
[0014] Furthermore, the microswitch is a push-button type microswitch. When the magnetic base is attracted, the switch rod can press the button to trigger the microswitch.
[0015] Furthermore, one end of the switch rod is a ball-shaped structure or a conical structure. When the magnet rotates and presses the switch rod, one end of the switch rod can generate a tangential force, causing tangential relative displacement between the switch rod and the magnet, and axial relative displacement between the switch rod, the magnetic base, and the machine body.
[0016] Furthermore, the elastic element is a spring.
[0017] The above technical solution has the following advantages or technical effects:
[0018] 1. In this utility model, through the linkage of the switch push rod and the micro switch, when the magnetic seat is not attracted, the elastic element presses the push rod against the magnetic seat, and the other end of the push rod is kept separated from the moving contact of the micro switch, physically blocking the motor start signal; only when the magnetic seat fully attracts the workpiece, the magnet rotates and pushes the switch push rod out of the rotating cavity, and the switch push rod moves upward against the elastic force of the elastic element, causing the other end of the switch push rod to trigger the moving contact of the micro switch, so that the motor can start.
[0019] 2. The adsorption protection switch of this utility model does not require electronic component control, which can avoid the risk of circuit failure when using circuit protection in existing solutions, and is suitable for industrial scenarios such as oil, dust, and humidity.
[0020] 3. This utility model uses a ball head / conical surface structure at one end of the switch rod to cause axial displacement of one end of the switch rod by the tangential force generated when the magnet rotates. When the magnetic seat is in contact with the adsorption state, the switch rod is axially displaced again under the action of the elastic element, and one end of the switch rod enters the rotating cavity. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a cross-sectional schematic diagram of the structure of this utility model when the magnetic base is not adsorbed;
[0023] Figure 3 This is a cross-sectional schematic diagram of the structure of this utility model in the magnetic adsorption state, viewed from the right.
[0024] The attached diagram is labeled as follows: 1-body, 2-magnetic base, 3-switch top rod, 3.1-flange step, 4-micro switch, 5-elastic element, 6-magnet pair. Detailed Implementation
[0025] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] like Figure 1 As shown, a permanent magnet magnetic base adsorption protection switch device includes: a body 1, a magnetic base 2, a switch top rod 3, a micro switch 4, and an elastic element 5;
[0027] The magnetic base 2 is fixedly connected to the body 1. The magnetic base 2 is provided with a rotating cavity 2.1 to accommodate the rotation of the magnet. The side of the magnetic base 2 that is fixed to the body 1 is provided with a through hole to accommodate one end of the switch rod 3 entering the rotating cavity 2.1.
[0028] The switch rod 3 is located inside the body 1 and the magnetic base 2, and the switch rod 3 is slidably connected to the through holes of the body 1 and the magnetic base 2;
[0029] The micro switch 4 is fixedly connected to the body 1. The moving contact of the micro switch 4 is in contact with the other end of the switch rod 3. The micro switch 4 has the height at which the other end of the switch rod 3 just triggers the moving contact of the micro switch 4 when the magnet pushes one end of the switch rod 3 out of the rotating cavity 2.1 when the magnet 2 is attracted.
[0030] One end of the elastic element 5 abuts against the machine body 1, and the other end of the elastic element 5 is located at one end of the switch rod 3, which is used to push the other end of the elastic element 5 into the rotating cavity 2.1.
[0031] The rotating cavity 2.1 is provided with a pair of magnets 6, which are two dissimilar magnets symmetrically arranged in the rotating cavity 2.1. The dissimilar magnetic poles include an S pole magnet and an N pole magnet. Both the S pole magnet and the N pole magnet are semi-circular and can rotate in the rotating cavity 2.1. The specific position of the pair of magnets 6 when the magnetic base 2 is in the adsorption state only needs to ensure that the switch rod 3 can be lifted. As a specific method in this embodiment, the direction of the maximum magnetic field generated by the pair of magnets 6 is parallel to the switch rod 3. There is a gap between the two dissimilar magnets of the pair of magnets 6 to accommodate one end of the switch rod 3 when the magnetic base 2 is not adsorbed.
[0032] One end of the switch rod 3 is provided with a flange step 3.1. The flange step 3.1 is at the same distance from one end of the switch rod 3 as the magnetic base 2 when one end of the switch rod 3 is pushed into the rotating cavity 2.1 and the other end of the switch rod 3 is separated from the moving contact of the micro switch 4. One end of the switch rod 3 is a ball-head structure or a conical structure. When the magnet rotates and presses the switch rod 3, a tangential force is generated at one end of the switch rod 3, causing a tangential relative displacement between the switch rod 3 and the magnet. The switch rod 3 also experiences axial relative displacement between the switch rod 3, the magnetic base 2, and the machine body 1. The tangential force generated when the magnet rotates causes an axial displacement at one end of the switch rod. When the magnetic base 2 is in the adsorption state, the switch rod is axially displaced again under the action of the elastic element, allowing one end of the switch rod to smoothly enter the rotating cavity 2.1.
[0033] Whether the microswitch 4 is triggered is a prerequisite for the motor to start. When the magnetic base 2 is not attracted, if... Figure 2 As shown, the magnet pair 6 inside the magnetic base 2 remains in its initial position, and the other end of the switch rod 3 falls into the gap between dissimilar magnets in the rotating cavity 2.1 under the action of the elastic element 5, and the switch rod 3 separates from the micro switch 4; when the magnetic base 2 is attracted, as... Figure 3As shown, the rotation of the magnet pair 6 inside the magnetic base 2 pushes the switch rod 3 out of the rotating cavity 2.1, thereby contacting the moving contact of the micro switch 4 and turning on the micro switch 4. At this time, the motor can be selected whether to start. This realizes the adsorption protection function of the permanent magnet base. The motor cannot start when the permanent magnet base is not adsorbed, and the motor can be selected whether to start when the permanent magnet base is adsorbed.
[0034] The elastic element 5 is located between the body 1 and the flange step 3.1. The fixed side of the body 1 and the magnetic base 2 is provided with a countersunk hole, and the elastic element 5 is located in the countersunk hole of the body 1.
[0035] Microswitch 4 is a push-button microswitch, specifically an Omron SS series push-button microswitch.
[0036] The elastic element 5 can be a spring.
[0037] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A permanent magnet base adsorption protection switch device, characterized in that, include: The machine body (1), magnetic base (2), switch rod (3), micro switch (4) and elastic element (5); The magnetic base (2) is fixedly connected to the body (1). The magnetic base (2) is provided with a rotating cavity (2.1) to accommodate the rotation of the magnet. The side of the magnetic base (2) that is fixed to the body (1) is provided with a through hole to accommodate one end of the switch rod (3) entering the rotating cavity (2.1). The switch rod (3) is located inside the body (1), and the switch rod (3) is slidably connected to the body (1); The micro switch (4) is fixedly connected to the body (1). The moving contact of the micro switch (4) is in contact with the other end of the switch rod (3). The micro switch (4) has a height at which the other end of the switch rod (3) just triggers the moving contact of the micro switch (4) when the magnet pushes one end of the switch rod (3) out of the rotating cavity (2.1) when the magnet is attracted by the magnetic seat (2). One end of the elastic element (5) abuts against the body (1), and the other end of the elastic element (5) is located at one end of the switch rod (3) for pushing the other end of the elastic element (5) into the rotating cavity (2.1).
2. The permanent magnet magnetic base adsorption protection switch device according to claim 1, characterized in that, The rotating cavity (2.1) is provided with a pair of magnets (6). The pair of magnets (6) consists of two different magnets symmetrically arranged in the rotating cavity (2.1). A gap is provided between the two different magnets of the pair of magnets (6) to accommodate one end of the switch rod (3) when the magnet seat (2) is not attracted.
3. The permanent magnet magnetic base adsorption protection switch device according to claim 2, characterized in that, One end of the switch rod (3) is provided with a flange step (3.1). The flange step (3.1) and one end of the switch rod (3) are at the same distance when one end of the switch rod (3) is pushed into the rotating cavity (2.1) and the other end of the switch rod (3) is separated from the moving contact of the micro switch (4) and the flange step (3.1) abuts against the magnetic base (2).
4. The permanent magnet magnetic base adsorption protection switch device according to claim 3, characterized in that, The elastic element (5) is located between the body (1) and the flange step (3.1).
5. The permanent magnet magnetic base adsorption protection switch device according to claim 1, characterized in that, The fixed side of the body (1) and the magnetic base (2) is provided with a countersunk hole, and the elastic element (5) is provided in the countersunk hole of the body (1).
6. A permanent magnet magnetic base adsorption protection switch device according to any one of claims 1 to 5, characterized in that, The micro switch (4) is a push-button micro switch.
7. A permanent magnet magnetic base adsorption protection switch device according to any one of claims 1 to 5, characterized in that, One end of the switch rod (3) is a ball head structure or a conical surface structure.
8. A permanent magnet magnetic base adsorption protection switch device according to any one of claims 1 to 5, characterized in that, The elastic element (5) is a spring.