Magnetic chuck

Abstract

The application discloses a magnetic chuck, comprising: a cylinder, one end of the cylinder is provided with at least a cylinder cover to form a closure, and a first air inlet and outlet interface and a second air inlet and outlet interface are arranged on the side of the cylinder; a magnetic guide base, the magnetic guide base is arranged at the other end of the cylinder and extends outward, a concave cavity is arranged at one end of the magnetic guide base in the direction of the inside of the cylinder; a magnetic guide piston, the magnetic guide piston is arranged in the inside of the cylinder; a permanent magnet, the permanent magnet is fixed at the bottom of the magnetic guide piston; when the first air inlet and outlet interface is ventilated, the permanent magnet can be filled in the inside of the concave cavity along with the movement of the magnetic guide piston, so that the magnetic guide base is magnetized; the magnetic chuck provided by the application cancels the guide protrusion in the magnetic guide base and is provided with a permanent magnet with the same size as the concave cavity at the bottom of the magnetic guide piston; when the permanent magnet is filled in the inside of the concave cavity, the magnetic force of the magnetic guide base and the magnetic guide piston is increased, so that the workpiece with large weight can be adsorbed.

Description

Technical Field

[0001] This application relates to a magnetic chuck that uses the magnetic force of a permanent magnet to attract and hold a workpiece. Background Technology

[0002] Currently, there are magnetic chucks on the market that have permanent magnet blocks that move up and down inside the cylinder. The permanent magnet blocks are fixed in place during the piston's up and down movement. Nearby parts are also magnetized. When the permanent magnet blocks move down and contact the product, the workpiece is attracted, generating a magnetic force and keeping the product from falling. When the internal piston moves up, the permanent magnet blocks and the product move away from each other, the magnetism weakens, the magnetic force on the product is eliminated, and the product separates.

[0003] like Figure 1 The magnetic chuck shown includes a magnetic piston 40 with a permanent magnet 50a at its bottom. A guide protrusion 30a is provided inside the magnetic base 30 to cooperate with the permanent magnet 50a. When the magnetic piston 40 is pushed into the magnetic base 30, the permanent magnet 50a magnetizes the magnetic piston 40 and the magnetic base 30 to attract the workpiece. However, because the permanent magnet 50a has a small attraction force, the magnetic chuck cannot generate a large attraction force, and therefore cannot meet the requirements for attracting heavier workpieces.

[0004] In addition, some other magnetic chucks in the prior art directly contact the magnetic piston with the magnetic base and use the magnetic base to directly attract the workpiece. This method can easily cause damage to the magnetic piston and the magnetic base.

[0005] To solve the above problems, there is an urgent need to provide a magnetic chuck. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this application discloses a magnetic chuck.

[0007] To achieve the above objectives, the technical solution adopted in this application is: a magnetic chuck, comprising:

[0008] A cylinder barrel, one end of which is provided with a cylinder head to form a closed structure, and the cylinder barrel is provided with a first air inlet / outlet port and a second air inlet / outlet port on its periphery.

[0009] A magnetic base is provided at the other end of the cylinder and extends outward. The magnetic base has a concave cavity at one end facing the inside of the cylinder.

[0010] A magnetic piston is disposed inside the cylinder. When the first air inlet / outlet is ventilated, the magnetic piston is pushed to move towards the magnetic base. When the second air inlet / outlet is ventilated, the magnetic piston is pushed towards the cylinder head.

[0011] A permanent magnet block is fixed at the bottom of the magnetically conductive piston. When air is supplied through the first air inlet / outlet port, the permanent magnet block can be filled inside the concave cavity as the magnetically conductive piston moves, thus magnetizing the magnetically conductive base.

[0012] In one embodiment of this application, a sealing plug is provided inside the cylinder near the cylinder head, and a first sealing ring is fitted around the outer periphery of the sealing plug to contact the inner wall of the cylinder.

[0013] In one embodiment of this application, the magnetic base is fitted with a second sealing ring on its outer periphery, which contacts the inner wall of the cylinder.

[0014] As one embodiment of this application, the magnetic base is provided with a first buffer ring at one end placed inside the cylinder. The upper surface of the first buffer ring is provided with several ventilation grooves in a ring array. When the magnetic piston is in contact with the first buffer ring, the several ventilation grooves can communicate with the second air inlet and outlet ports.

[0015] As one embodiment of this application, the magnetic base is fitted with a second buffer ring that extends outward to prevent the attracted object from impacting it.

[0016] More preferably, the inner edge of the second buffer ring has a first step at one end facing outward, and the magnetic base has an annular groove at one end away from the cylinder. When the second buffer ring is fixed to the magnetic base, the first step of the second buffer ring is engaged inside the annular groove of the magnetic base.

[0017] In one embodiment of this application, the outer periphery of the magnetic piston is fitted with a third sealing ring that contacts the inner wall of the cylinder.

[0018] In one embodiment of this application, a fixing ring is installed at one end of the cylinder relative to the cylinder head, a second step is provided on the inner wall of the cylinder relative to the cylinder head, a third step is provided on the inner edge of the fixing ring in the direction towards the cylinder, and a fourth step is provided on the outer wall of the middle part of the magnetic base. When the magnetic base is fixed to the cylinder, the end face of the magnetic base placed inside the cylinder abuts against the second step, and the fourth step of the magnetic base abuts against the third step of the fixing ring.

[0019] In one embodiment of this application, the magnetic piston has an integral cylindrical protrusion at one end facing the magnetic base, and the permanent magnet block has an annular through groove inside. When the permanent magnet block and the magnetic piston are fixed, the cylindrical protrusion of the magnetic piston is inserted into the annular through groove of the permanent magnet block, and a screw is screwed into the permanent magnet block to fix it to the cylindrical protrusion of the magnetic piston.

[0020] This application achieves the following beneficial effects:

[0021] 1. The magnetic chuck provided in this application eliminates the guide protrusion in the magnetic base and sets a permanent magnet block at the bottom of the magnetic piston that matches the size of the concave cavity. When the permanent magnet block is filled into the concave cavity, the magnetic force of the magnetic base and the magnetic piston is increased, thereby satisfying the adsorption of heavy workpieces.

[0022] 2. This application provides a first buffer ring at one end of the magnetic base placed inside the cylinder, which can prevent the magnetic piston from directly contacting the magnetic base, thus playing a role in synchronously protecting the magnetic base and the magnetic piston, improving the service life of the magnetic chuck, and reducing the investment cost of enterprises.

[0023] 3. This application provides an outwardly extending second buffer ring at the bottom of the magnetic base, which can buffer the workpiece adsorbed by the magnetic base, thereby avoiding direct contact between the magnetic base and the workpiece, effectively preventing the workpiece from damaging the magnetic base, improving the service life of the magnetic chuck, and thus reducing the investment cost of enterprises.

[0024] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures shown in the description and the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the disclosure of this application and, together with the specification, serve to explain the principles of this disclosure.

[0026] Figure 1 This is a schematic diagram of a cross-sectional structure of an existing magnetic chuck;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the magnetic chuck claimed in this application;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of the magnetic chuck claimed in this application;

[0029] Figure 4 This is a schematic diagram of the exploded structure of the magnetic chuck claimed in this application;

[0030] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the magnetic chuck claimed in this application;

[0031] Figure 6 A schematic diagram of the air path for the magnetic suction operation of the magnetic chuck claimed in this application;

[0032] Figure 7This is a schematic diagram of the air path for the release of the magnetic chuck claimed in this application. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0034] In the description of this application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the component or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Example

[0036] In order to solve Figure 1 The magnetic chuck shown has a weak magnetic force and cannot attract heavy workpieces. (Refer to...) Figures 2-7 As shown, this application discloses a magnetic chuck, including a cylinder 10, a magnetic base 30, a magnetic piston 40, and a permanent magnet block 50;

[0037] One end of the cylinder barrel 10 is provided with a cylinder cover 20 to form a seal. In order to ensure that the cylinder cover 10 does not leak air, a sealing plug 60 is provided inside the cylinder barrel 10 near the cylinder cover 20. A first sealing ring 61 that contacts the inner wall of the cylinder barrel 10 is fitted around the outer periphery of the sealing plug 60 (the second sealing ring 32 and the third sealing ring 41 below are made of rubber and plastic materials, which are used to seal the cylinder, and will not be described in detail later).

[0038] The cylinder 10 has a first air inlet / outlet port 11 and a second air inlet / outlet port 12 on its circumference, which are used for air intake and exhaust respectively.

[0039] The magnetic base 30 is located at the other end of the cylinder 10 and extends outward. The magnetic base 30 is fitted with a second sealing ring 32 on the outer periphery of the cylinder 10, which contacts the inner wall of the cylinder 10. The magnetic base 30 has a concave cavity 31 at one end facing the inside of the cylinder 10.

[0040] The magnetic piston 40 is disposed inside the cylinder 10, and a third sealing ring 41 is sleeved on the outer periphery of the magnetic piston 40 to contact the inner wall of the cylinder 10; when the first air inlet / outlet port 11 is ventilated, the magnetic piston 40 is pushed to move towards the magnetic base 30; when the second air inlet / outlet port 12 is ventilated, the magnetic piston 40 is pushed to move towards the cylinder head 20.

[0041] The permanent magnet block 50 is fixed at the bottom of the magnetic piston 40. When the first air inlet / outlet port 11 is ventilated, the permanent magnet block 50 can be filled into the concave cavity 31 as the magnetic piston 40 moves, so that the magnetic base 30 is magnetized.

[0042] Based on the above arrangement and operation instructions of the magnetic base 30, magnetic piston 40, and permanent magnet 50: (Refer to...) Figure 6 As shown, when the first air inlet / outlet port is controlling the intake of air into the cylinder 10 (the second air inlet / outlet port is exhausting air), the gas entering the cylinder 10 will push the magnetic piston 40 toward the magnetic base 30. When the permanent magnet block 50 on the magnetic piston 40 is completely filled into the concave cavity 31, the magnetic piston 40 and the magnetic base 30 will be magnetized together by the permanent magnet block 50. At this time, the workpiece can be quickly attracted when it comes into contact with the magnetic base 30. Since this application has eliminated the guide protrusion in the magnetic base 30 and adopted a large-volume annular block structure for the permanent magnet block 50, when the permanent magnet block 50 enters the concave cavity 31 of the magnetic base 30, it can ensure that the magnetic piston 40 and the magnetic base 30 have a greater attraction force. In this way, even heavy workpieces can be easily attracted.

[0043] refer to Figure 7 As shown, when air enters through the second air inlet / outlet port 12 (when air exits through the first air inlet / outlet port), the gas will push the magnetic piston 40 toward the sealing plug 60. When the permanent magnet block 50 on the magnetic piston 40 is completely separated from the concave cavity 31, the magnetic base 30 will lose its attraction, and the workpiece will fall off the magnetic base 30.

[0044] refer to Figure 3 and Figure 4As shown, the magnetic base 30 of this application has a first buffer ring 70 at one end placed inside the cylinder 10. When air enters through the first air inlet / outlet port 11, the gas entering the cylinder 10 pushes the magnetic piston 40 until it is limited by the first buffer ring 70. At this time, the permanent magnet 50 enters the set position in the concave cavity 31. Furthermore, by setting the first buffer ring 70, the magnetic piston 40 is prevented from directly colliding with the magnetic base 30, thereby improving the service life of the magnetic base 30 and the magnetic piston 40. In addition, to avoid the first buffer ring 70 affecting the second air inlet / outlet port... The problem of air intake 12 preventing the gas from pushing the magnetic piston 40 towards the plug is addressed by this application, which provides several ventilation grooves 71 in a ring array on the upper surface of the first buffer ring 70. In this way, when the magnetic piston 40 is in contact with the first buffer ring 70, the ventilation grooves 71 can communicate with the second air intake / exhaust port 12. When the second air intake / exhaust port 12 is controlled to allow air to enter, the gas will generate a large thrust along the ventilation grooves 71 to push the magnetic piston 40 towards the sealing plug 60, thereby causing the permanent magnet 50 to disengage from the concave cavity 31 of the magnetic base 30.

[0045] refer to Figure 3 and Figure 4 As shown, in order to solve the problem that existing magnetic chucks cause the magnetic base 30 to directly contact the workpiece, which easily leads to damage to the magnetic base 30, this application provides a second buffer ring 80 that extends outward on the magnetic base 30 to avoid impact from the object being attracted. When adsorbing the workpiece, the workpiece will first contact the second buffer ring 80, causing the second buffer ring 80 to deform under force until it is adsorbed by the magnetic base 30. In this way, the magnetic base 30 can be protected, and the service life of the entire magnetic chuck can be improved.

[0046] refer to Figure 3 and Figure 4 As shown, in one installation method of the second buffer ring 80 and the magnetic base 30, the second buffer ring 80 has a first step 81 at one end facing outward on its inner edge, and the magnetic base 30 has an annular groove 33 at one end away from the cylinder 10. When the second buffer ring 80 and the magnetic base 30 are fixed, the first step 81 of the second buffer ring 80 is engaged inside the annular groove 33 of the magnetic base 30. Based on this installation method, the second buffer ring 80 can be stably installed on the magnetic base 30, and it is also beneficial for the later maintenance and replacement of the magnetic chuck, resulting in better performance.

[0047] refer to Figure 5As shown, in order to fix the magnetic base 30, this application has a fixing ring 90 installed on the cylinder 10 at one end relative to the cylinder head 20. The inner wall of the cylinder 10 has a second step 13 at one end relative to the cylinder head 20. The inner edge of the fixing ring 90 has a third step 91 in the direction towards the cylinder 10. The outer wall of the middle part of the magnetic base 30 has a fourth step 34. When the magnetic base 30 is fixed to the cylinder 10, the end face of the magnetic base 30 placed inside the cylinder 10 abuts against the second step 13. The fourth step 34 of the magnetic base 30 abuts against the third step 91 of the fixing ring 90. In specific implementation, the fixing ring 90 of this application is preferably fixed to the cylinder 10 by bolts. And by removing the fixing ring 90, the magnetic base 30 can be separated from the cylinder 10, so that the operator can inspect and replace other parts inside the cylinder 10.

[0048] refer to Figure 3 and Figure 4 As shown, in one installation method of the permanent magnet block 50 and the magnetic piston 40, the magnetic piston 40 of this application has an integral cylindrical protrusion 42 at one end facing the magnetic base 30. The permanent magnet block 50 has an annular through groove 51 inside. When the permanent magnet block 50 and the magnetic piston 40 are fixed, the cylindrical protrusion 42 of the magnetic piston 40 is inserted into the annular through groove 51 of the permanent magnet block 50, and a screw 52 is screwed into the permanent magnet block 50 to fix it to the cylindrical protrusion 42 of the magnetic piston 40. When the permanent magnet block 50 and the magnetic piston 40 are disassembled, the operator only needs to unscrew the screw 52 and pull the permanent magnet block 50 off the cylindrical protrusion 42. This also makes it convenient for the operator to carry out maintenance and replacement later.

[0049] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.

Claims

1. A magnetic chuck, characterized in that, include: A cylinder barrel, one end of which is provided with a cylinder head to form a closed structure, and the cylinder barrel is provided with a first air inlet / outlet port and a second air inlet / outlet port on its periphery. A magnetic base is provided at the other end of the cylinder and extends outward. The magnetic base has a concave cavity at one end facing the inside of the cylinder. A magnetic piston is disposed inside the cylinder. When the first air inlet / outlet is ventilated, the magnetic piston is pushed to move towards the magnetic base. When the second air inlet / outlet is ventilated, the magnetic piston is pushed towards the cylinder head. A permanent magnet block is fixed at the bottom of the magnetically conductive piston. When air is supplied through the first air inlet / outlet port, the permanent magnet block can be filled inside the concave cavity as the magnetically conductive piston moves, thus magnetizing the magnetically conductive base.

2. A magnetic chuck according to claim 1, characterized in that, The cylinder barrel has a sealing plug near the cylinder head inside, and a first sealing ring is fitted around the outer periphery of the sealing plug to contact the inner wall of the cylinder barrel.

3. A magnetic chuck according to claim 1, characterized in that, The magnetic base is fitted with a second sealing ring on its outer periphery, which contacts the inner wall of the cylinder.

4. A magnetic chuck according to claim 1, characterized in that, The magnetic base has a first buffer ring at one end placed inside the cylinder. The upper surface of the first buffer ring has several ventilation grooves arranged in a ring array. When the magnetic piston is in contact with the first buffer ring, the ventilation grooves can communicate with the second air inlet and outlet ports.

5. A magnetic chuck according to claim 1, characterized in that, The magnetic base is fitted with a second buffer ring that extends outward to prevent impact from the attracted object.

6. A magnetic chuck according to claim 5, characterized in that, The inner edge of the second buffer ring has a first step at one end facing outward, and the magnetic base has an annular groove at one end away from the cylinder. When the second buffer ring is fixed to the magnetic base, the first step of the second buffer ring is engaged inside the annular groove of the magnetic base.

7. A magnetic chuck according to claim 1, characterized in that, The outer periphery of the magnetic piston is fitted with a third sealing ring that contacts the inner wall of the cylinder.

8. A magnetic chuck according to claim 1, characterized in that, The cylinder has a retaining ring installed at one end relative to the cylinder head. The inner wall of the cylinder has a second step at one end relative to the cylinder head. The inner edge of the retaining ring has a third step in the direction towards the cylinder. The outer wall of the middle part of the magnetic base has a fourth step. When the magnetic base is fixed to the cylinder, the end face of the magnetic base placed inside the cylinder abuts against the second step. The fourth step of the magnetic base abuts against the third step of the retaining ring.

9. A magnetic chuck according to claim 1, characterized in that, The magnetic piston has an integral cylindrical protrusion at one end facing the magnetic base. The permanent magnet block has an annular through groove inside. When the permanent magnet block is fixed to the magnetic piston, the cylindrical protrusion of the magnetic piston is inserted into the annular through groove of the permanent magnet block, and a screw is screwed into the permanent magnet block to fix it to the cylindrical protrusion of the magnetic piston.

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