Anti-jamming switch device of pneumatic magnetic drilling machine

Abstract

The utility model discloses a kind of switch devices of anti-jamming pneumatic magnetic drilling machine, it is related to self-locking switch field, including valve body, magnetic base, shaft body and magnetic shaft, valve body is fixedly installed on magnetic base, shaft body is rotatably connected in valve body, first gear is fixedly connected with one end of shaft body, first limit column of radially being provided is connected with other end of shaft body, rear cover is installed in the rear side of valve body, the outer side surface of rear cover is equipped with the limit shaft sleeve rotatably connected with shaft body, magnetic shaft is rotatably connected in magnetic base, second gear is fixedly connected with first gear and engaged with one end of magnetic shaft, second limit column is fixedly connected on the other end surface of magnetic shaft, magnetic yoke cover is installed in the rear side of magnetic base, semicircular groove is opened on the inner side surface of magnetic yoke cover, second limit column moves in the circumferential direction in semicircular groove, the device can be linked to limit in the rotation direction to magnetic shaft, effectively avoid the jamming phenomenon when shaft body moves in axial direction, ensure the smooth of pneumatic magnetic drilling machine when starting and stopping.

Description

Technical Field

[0001] This utility model belongs to the field of self-locking switches, specifically relating to a switch device for an anti-jamming pneumatic magnetic drilling machine. Background Technology

[0002] Pneumatic magnetic drilling machines are used for drilling holes in steel plates in underground coal mines. Currently, the magnetic adsorption mechanism uses a magnetic base device. Inside the magnetic base is a rotatable magnetic shaft (or magnetic core), with permanent magnets (such as neodymium iron boron) embedded in it. The magnetic shaft itself does not generate or eliminate magnetic force; it only guides the magnetic field lines. When the magnetic shaft rotates to a certain angle, the magnetic field lines form a closed loop inside the magnetic base. At this point, the magnetic field lines are almost entirely confined within the outer shell of the magnetic base, rarely passing through the bottom working surface, resulting in little or no attraction. When the magnetic shaft rotates to a certain angle, the magnetic field lines are guided to the bottom working surface of the magnetic base. Here, the magnetic field lines must pass through the working surface and the working table (such as steel) to form a complete magnetic circuit, thus generating a strong attraction. In practical applications, due to differences in magnetic force between the yoke and the magnetic shaft, and asymmetry in the magnetic circuit, the magnetic shaft may exhibit springback, which is particularly noticeable at the point of maximum magnetic force.

[0003] For example, Chinese patent application CN201922408458.1 discloses an interlocking switch device for a pneumatic drilling rig. This device uses an interlocking shaft to limit the movement of a permanent magnet shaft. When the permanent magnet shaft rotates to the angle where the magnetic force is at its maximum, if the rotation angle is slightly less than this angle, the permanent magnet shaft will spring back. If the rotation angle is slightly greater than this angle, the permanent magnet shaft will continue to spring forward. This causes the permanent magnet shaft to generate a reaction force on the interlocking shaft through a gear linkage structure, requiring a large force to push or pull the interlocking shaft axially, resulting in severe jamming and hindering the start-up and shutdown operation of the pneumatic drilling rig. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides a switching device for an anti-jamming pneumatic magnetic drilling machine. The limiting mechanism of the magnetic shaft is set on the magnetic base, and the limiting mechanism of the shaft body is set on the valve body. The two cooperate with each other to achieve a self-locking function while effectively preventing jamming of the shaft body during axial movement.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A switching device for an anti-jamming pneumatic magnetic drilling machine includes a valve body, a magnetic base, a shaft, and a magnetic shaft. The valve body is fixedly mounted on the magnetic base. The shaft is rotatably connected to the valve body. A first gear is fixedly connected to one end of the shaft, and a first limiting post is radially arranged at the other end of the shaft. A rear cover is installed on the rear side of the valve body. A limiting sleeve that is rotatably connected to the shaft is provided on the outer surface of the rear cover. The magnetic shaft is rotatably connected to the magnetic base. A second gear that meshes with the first gear is fixedly connected to one end of the magnetic shaft, and a second limiting post is fixedly connected to the other end of the magnetic shaft. A magnetic yoke cover is installed on the rear side of the magnetic base. A semi-circular groove is opened on the inner surface of the magnetic yoke cover, and the second limiting post moves circumferentially within the semi-circular groove.

[0006] As a further feature of the above solution, a limiting step is provided on the outer end face of the limiting bushing, and a straight groove is provided at the lower end of the limiting bushing. The straight groove is parallel to the shaft body, and the first limiting post can slide back and forth in the straight groove. Rotating the shaft body drives the first limiting post into the straight groove, and axially pulling the shaft body drives the first limiting post to slide in the straight groove. The straight groove limits the shaft body in the circumferential direction through the first limiting post.

[0007] As a further feature of the above scheme, the semicircular groove has a closing groove and an opening groove at both ends. A limit groove is opened on the outer side of the opening groove in a clockwise direction. When the second limit post is in the position of the closing groove, the magnetic seat is in the closed state and the magnetic force is minimal. When the second limit post is in the position of the opening groove, the magnetic seat is in the open state and the magnetic force is maximum.

[0008] As a further feature of the above scheme, the valve body is provided with an air inlet and an air outlet, which are connected to the interior of the valve body. By controlling the forward and backward movement of the shaft, the connection and closing states between the air inlet and the air outlet are switched, thereby controlling the start and stop of the pneumatic motor.

[0009] As a further feature of the above solution, a handle is connected to the outside of the shaft to facilitate axial pushing and pulling of the shaft.

[0010] This utility model has the following beneficial effects: The axial and rotational limits of the shaft are achieved through a sliding fit between the limiting step and straight groove on the rear cover and the first limiting post on the shaft. This, along with the first and second gears, provides simultaneous limiting of the magnetic shaft in both axial and rotational directions, preventing accidental closure of the magnetic seat. Simultaneously, the second limiting post slides within the semi-circular groove and enters the limiting groove, causing the magnetic shaft to spring back. The limiting groove, through the second limiting post, limits and relieves the springback force of the magnetic shaft, significantly reducing the reaction force exerted by the magnetic shaft on the shaft via the first and second gears. This effectively prevents jamming during axial movement of the shaft, ensuring smooth start-up and shutdown of the pneumatic magnetic drilling machine. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram showing the positions of the shaft and the limiting bushing of this utility model; Figure 4 This is a schematic diagram showing the position of the straight groove in this utility model; Figure 5 This is a schematic diagram of the magnetic shaft of this utility model; Figure 6 This is a schematic diagram of the magnetic yoke cover of this utility model.

[0012] 1. Valve body; 2. Magnetic base; 3. Shaft; 301. First limiting post; 4. Handle; 5. First gear; 6. Second gear; 7. Rear cover; 701. Limiting bushing; 702. Limiting step; 703. Straight groove; 8. Magnetic shaft; 801. Second limiting post; 9. Magnetic yoke cover; 901. Semicircular groove; 9011. Closing groove; 9012. Opening groove; 902. Limiting groove; 10. Air inlet; 11. Air outlet. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-6 This application will be described in detail with reference to the embodiments.

[0015] A switching device for an anti-jamming pneumatic magnetic drilling machine includes a valve body 1, a magnetic base 2, a shaft 3, and a magnetic shaft 8. The valve body 1 is fixedly installed on the magnetic base 2. The shaft 3 is rotatably connected inside the valve body 1. A first gear 5 is fixedly connected to one end of the shaft 3, and a first limiting post 801 is radially arranged at the other end of the shaft 3. A rear cover 7 is installed on the rear side of the valve body 1. A limiting sleeve 701 that is rotatably connected to the shaft 3 is provided on the outer surface of the rear cover 7. The magnetic shaft 8 is rotatably connected inside the magnetic base 2. A second gear 6 that meshes with the first gear 5 is fixedly connected to one end of the magnetic shaft 2. A second limiting post 801 is fixedly connected to the other end of the magnetic shaft 8. A magnetic yoke cover 9 is installed on the rear side of the magnetic base 2. A semi-circular groove 901 that is slidably connected to the second limiting post 801 is opened on the inner side of the magnetic yoke cover 9.

[0016] The valve body 1 is provided with an air inlet 10 and an air outlet 11. The air inlet 10 and the air outlet 11 are connected to the inside of the valve body 1. By controlling the forward and backward movement of the shaft 3, the connection and closing states between the air inlet 10 and the air outlet 11 are switched.

[0017] A limiting step 702 is provided on the outer end face of the limiting bushing 701, and a straight groove 703 is provided at the lower end of the limiting bushing 701. The straight groove 703 is set parallel to the shaft body 3. The first limiting post 301 can slide back and forth in the straight groove 703. Rotating the shaft body 3 drives the first limiting post 301 into the straight groove 703. Axially pulling the shaft body 3 drives the first limiting post 301 to slide in the straight groove 703. The straight groove 703 limits the shaft body 3 in the circumferential direction through the first limiting post 301. When the first limiting post 301 is not in the straight groove 703, the limiting step 702 limits the shaft body 3 axially through the first limiting post 301, so that the shaft body 3 cannot be pulled axially, and thus the drilling machine cannot be started.

[0018] The semicircular groove 901 has a closing groove 9011 and an opening groove 9012 at both ends. A limit groove 902 is opened on the outer side of the opening groove 9012 in a clockwise direction. When the second limit post 801 is in the position of the closing groove 9011, the magnetic seat is in the closed state and the magnetic force is minimal. When the second limit post 801 is in the position of the opening groove, the magnetic seat is in the open state and the magnetic force is maximum.

[0019] The working process of this utility model is as follows: When the drilling machine is in the closed state, the second limiting post 801 is in the position of the closing groove 9011, and the first limiting post 301 slides in contact with the limiting step 702 outside the straight groove 703. The limiting step 702 axially limits the shaft 3 through the first limiting post 301, causing the shaft 3 to rotate by an angle greater than 180°. The shaft 3 drives the first limiting post 301 into the straight groove 703, and the shaft 3 drives the first gear 5 to rotate. The first gear 5 drives the second gear 6 to rotate, and the second gear 6 drives the magnetic shaft 7 to rotate. The second limiting post 801 slides in the semi-circular groove 901 and enters the limiting groove 902, so that the magnetic seat 8 is in the open state, thereby adsorbing the drilling machine onto the steel part. The axis pulls the shaft 3, and the first limiting post 301 slides in the straight groove 703. The air inlet 10 and the air outlet 11 are connected, and the pneumatic motor is started.

[0020] When the second limiting post 801 is within the limiting groove 902, the magnetic shaft 7 springs back clockwise. The limiting groove 902 blocks the second limiting post 801, and the second limiting post 801 limits and unloads the springback of the magnetic shaft 7, thereby preventing the magnetic shaft 7 from exerting a reaction force on the shaft body 3 through the first gear 5 and the second gear 6. This greatly reduces the frictional resistance between the first gear 5 and the second gear 6, effectively preventing the shaft body 3 from jamming during axial movement and ensuring smooth start-up and shutdown of the pneumatic magnetic drilling machine.

[0021] During the entire operation, when the pneumatic motor is in the off state, the limiting step 702 axially limits the shaft 3 through the first limiting post 301, preventing the shaft 3 from being pulled axially. This avoids starting the drilling machine when the magnetic seat 2 is closed. After starting the pneumatic motor according to the above action, the first limiting post 301 is in the straight groove 703, and the shaft 3 cannot rotate. Consequently, the magnetic shaft 8 cannot rotate, and the magnetic seat cannot be closed. This effectively prevents the drilling machine from falling off the workpiece during operation due to misoperation of the magnetic seat.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

Claims

1. A switching device for an anti-jamming pneumatic magnetic drilling machine, comprising a valve body, a magnetic base, a shaft, and a magnetic shaft, wherein the valve body is fixedly mounted on the magnetic base, characterized in that, The shaft is rotatably connected to the valve body. A first gear is fixedly connected to one end of the shaft, and a first limiting post is radially connected to the other end of the shaft. A rear cover is installed on the rear side of the valve body. A limiting bushing that is rotatably connected to the shaft is provided on the outer side of the rear cover. The magnetic shaft is rotatably connected to the magnetic base. A second gear that meshes with the first gear is fixedly connected to one end of the magnetic shaft, and a second limiting post is fixedly connected to the other end of the magnetic shaft. A magnetic yoke cover is installed on the rear side of the magnetic base. A semi-circular groove is opened on the inner side of the magnetic yoke cover, and the second limiting post moves circumferentially within the semi-circular groove.

2. The switching device for the anti-jamming pneumatic magnetic drilling machine according to claim 1, characterized in that, The outer end face of the limiting bushing has a limiting step, and the lower end of the limiting bushing has a straight groove, which is parallel to the shaft body. The first limiting post can slide back and forth in the straight groove.

3. The switching device for the anti-jamming pneumatic magnetic drilling machine according to claim 1, characterized in that, The semicircular groove has a closing groove and an opening groove at both ends, and a limit groove is opened on the outer side of the opening groove in a clockwise direction.

4. The switching device for the anti-jamming pneumatic magnetic drilling machine according to claim 1, characterized in that, The valve body is provided with an air inlet and an air outlet, which are connected to the inside of the valve body. By controlling the forward and backward movement of the shaft, the connection and closing states between the air inlet and the air outlet can be switched.

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