Magnetic encoder with sealing lip

Abstract

The utility model relates to the field of special manufacturing, and discloses a magnetic encoder with a sealing lip, which comprises a metal framework, a magnetic rubber body is arranged at the top end of the metal framework, a sealing lip body is arranged in the metal framework, an adhesive is arranged on the surface of the metal framework, a control mechanism is arranged in the metal framework, and the control mechanism is connected with the sealing lip body. The control mechanism comprises an air pressure bin and a mounting bin, the air pressure bin is formed in the inner wall of the metal framework, a sliding block is connected to an inner wall piston of the air pressure bin, and the mounting bin is formed in the inner wall, located on the outer side of the air pressure bin, of the metal framework. According to the sealing lip, the material of the sealing lip body, the adhesive and the control mechanism are used in cooperation, so that the sealing lip body can be integrated with the metal framework in a vulcanization mode, the adhesive cannot be pushed due to the fact that the sealing lip body is tightly attached to the metal framework before vulcanization, and it is ensured that the sealing lip can be tightly connected with the metal framework after vulcanization.

Description

Technical Field

[0001] The utility model relates to a special manufacturing field, in particular to a magnetic encoder with a sealing lip. Background Art

[0002] The magnetic encoder, also known as the magnetoelectric encoder, is a new type of angle or displacement measuring device. In order to ensure its stability and accuracy during operation, it is often necessary to install a sealing lip on the magnetic encoder.

[0003] After searching, Chinese patent announcement number: CN213954174U discloses a magnetic encoder with sealing lip, which mainly includes sealing lip, magnetic encoder frame, magnetic rubber, groove, magnetic rubber is installed in the groove of the magnetic encoder frame, a sealing lip is arranged on the outer side of the outer diameter of the magnetic rubber, the sealing lip and the magnetic rubber are rubber-coated together, and the sealing lip and the inner diameter of the end cover are interference fit. The above application document is applied to the non-driving wheel by rubber coating on the frame and adding a sealing lip. During operation, it can well prevent grease from flowing into the concave cavity of the end cover and the flange from the gap between the end cover and the magnetic encoder, avoiding the reduction of grease in the raceway and avoiding affecting the reading of the sensor signal; the rubber lip is directly adhered to the outer side of the frame, and the process is simple.

[0004] The above application document avoids the reduction of grease in the raceway by encapsulating the sealing lip with magnetic rubber. However, in actual use, since the sealing lip has a certain deformation ability, it is only attached to the outside of the encoder. After a long period of use, the sealing lip may deform and a gap may be generated between the encoder and the encoder, thereby causing oil leakage. Therefore, a magnetic encoder with a sealing lip is proposed to solve the above problem. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a magnetic encoder with a sealing lip, aiming to improve the problem in the prior art that the fixing effect between the sealing lip and the magnetic rubber is poor and the sealing effect is easily affected after a period of use.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a magnetic encoder with a sealing lip, comprising a metal frame, a magnetic rubber body is arranged at the top of the metal frame, a sealing lip body is arranged inside the metal frame, an adhesive is arranged on the surface of the metal frame, a control mechanism is arranged inside the metal frame, the control mechanism comprises an air pressure chamber and an installation chamber, the air pressure chamber is opened on the inner wall of the metal frame, a slider is connected to the inner wall piston of the air pressure chamber, the installation chamber is opened on the inner wall of the metal frame outside the air pressure chamber, the inner wall of the installation chamber is slidably connected to a control block, the inner wall of the control block is provided with an oblique groove, the end of the slider close to the outer side of the metal frame is fixedly connected to a moving block, the end of the control block away from the moving block is provided with a fixing component, and the fixing component includes a positioning block.

[0007] As a further description of the above technical solution:

[0008] The outer wall of the moving block is fixedly connected with a control rod, and the control rod is located inside the inclined groove.

[0009] As a further description of the above technical solution:

[0010] The outer wall of the positioning block is fixedly connected to the outer wall of the moving block, the inner walls at the left and right ends of the positioning block are provided with moving grooves, the inner wall of the moving groove is slidably connected with a clamping block, the outer wall of the clamping block is elastically connected to the inner wall of the moving groove through a spring, and the inner wall of the sealing lip body is provided with a positioning groove.

[0011] As a further description of the above technical solution:

[0012] The shapes of the metal frame, the magnetic rubber body and the sealing lip body are all set to be ring-shaped, and the sizes of the magnetic rubber body and the sealing lip body are consistent with the metal frame.

[0013] As a further description of the above technical solution:

[0014] The distance between one end of the inclined groove close to the slider and the positioning block is greater than the distance between one end of the inclined groove far from the slider and the positioning block.

[0015] As a further description of the above technical solution:

[0016] An interference fit is generated between the outer diameter of the metal skeleton and the inner diameter of the magnetic rubber body, and the thickness of the metal skeleton wrapping the magnetic rubber body is 1.0 to 1.2 millimeters.

[0017] As a further description of the above technical solution:

[0018] The material of the sealing lip body is set as NBR nitrile rubber, and the shape of the sealing lip body is composed of a connecting part with a cross-section approximately in the shape of a "匚" connected to the metal skeleton on the outside and a sealing part with a cross-section approximately in the shape of an "L" on the inside.

[0019] As a further description of the above technical solution:

[0020] The inside of the air pressure chamber is provided with a heat-expandable gas, and one end of the air pressure chamber close to the inside of the metal skeleton of the slider is not communicated with the outside.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, through the combined use of the material of the sealing lip body, the adhesive and the control mechanism, the sealing lip body can be integrally formed with the metal skeleton by vulcanization, and before vulcanization, the adhesive will not be pushed due to being in close contact with the metal skeleton, ensuring that the sealing lip and the metal skeleton are tightly connected after vulcanization and are not easily deformed during use.

[0023] 2. In the utility model, through the setting of the fixing component, it is ensured that before vulcanization, after the sealing lip body is installed outside the metal skeleton, it can be kept in a state surrounding the metal skeleton under the drive of the clamping block, achieving the effect of preventing the sealing lip from moving during vulcanization and affecting the fixing effect after vulcanization. Description of the Drawings

[0024] Figure 1 is a three-dimensional structure schematic diagram of the overall structure in the utility model;

[0025] Figure 2 is a three-dimensional structure sectional schematic diagram of the overall structure in the utility model;

[0026] Figure 3 is in the utility model Figure 2 is a three-dimensional structure enlarged schematic diagram of part A therein;

[0027] Figure 4 is in the utility model Figure 3 is a three-dimensional structure enlarged schematic diagram of part B therein;

[0028] Figure 5 is a three-dimensional structure sectional split schematic diagram of the overall structure in the utility model;

[0029] Figure 6 is in the utility model Figure 5 is a three-dimensional structure enlarged schematic diagram of part C therein;

[0030] Figure 7 is a three-dimensional structure sectional schematic diagram of the control mechanism in the utility model;

[0031] Figure 8 For the utility model Figure 7 Schematic diagram of the enlarged three-dimensional structure of part D in the middle.

[0032] Legend:

[0033] 1. Metal skeleton; 2. Magnetic rubber body; 3. Sealing lip body; 4. Adhesive; 5. Control mechanism; 51. Air pressure chamber; 52. Mounting chamber; 53. Slider; 54. Control block; 55. Inclined groove; 56. Moving block; 57. Control rod; 58. Fixed assembly; 581. Positioning block; 582. Moving groove; 583. Block; 584. Spring; 585. Positioning groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Reference Figure 1 - Figure 3, an embodiment provided by the present utility model: a magnetic encoder with a sealing lip, including a metal skeleton 1. The cross-sectional shape of the metal skeleton 1 is approximately in the shape of a "冂", and the height of one end inside the metal skeleton 1 is lower than that of the outer end. A magnetic rubber body 2 is provided at the top of the metal skeleton 1. After being activated, the magnetic rubber body 2 continuously emits signals perpendicular to the alternately arranged N / S poles of the magnetic rubber body 2. An interference fit is generated between the outer diameter of the metal skeleton 1 and the inner diameter of the magnetic rubber body 2, and the thickness of the metal skeleton 1 wrapping the magnetic rubber body 2 is 1.0 to 1.2 millimeters. Through the setting of the interference fit, it is ensured that the metal skeleton 1 and the magnetic rubber body 2 can be stably fixed. A sealing lip body 3 is arranged inside the metal skeleton 1. The material of the sealing lip body 3 is set as NBR nitrile rubber. Through the material setting of the sealing lip body 3, it is ensured that the sealing lip body 3 has good oil resistance, wear resistance, heat resistance and adhesiveness. The shape of the sealing lip body 3 is composed of a connecting part with a cross-section approximately in the shape of a "匚" connected to the outer side of the metal skeleton 1 and a sealing part with a cross-section approximately in the shape of an "L" on the inner side. Through the shape setting of the sealing lip body 3, it is ensured that while the sealing lip body 3 can achieve a good fixing effect, it can also ensure the blocking effect on oil. An adhesive 4 is provided on the surface of the metal skeleton 1. The shapes of the metal skeleton 1, the magnetic rubber body 2 and the sealing lip body 3 are all set as annular, and the sizes of the magnetic rubber body 2 and the sealing lip body 3 both fit the metal skeleton 1. Through the vulcanization and molding process, the magnetic rubber body 2 and the sealing lip body 3 can be attached to the outside of the metal skeleton 1 through the adhesive 4 and connected into one body.

[0036] Refer to Figure 3 - Figure 6 , a control mechanism 5 is arranged inside the metal skeleton 1. The control mechanism 5 includes a pneumatic chamber 51 and an installation chamber 52. The pneumatic chamber 51 is opened on the inner wall of the metal skeleton 1. A piston of the inner wall of the pneumatic chamber 51 is connected with a slider 53. The outer wall of the slider 53 fits the inner wall of the pneumatic chamber 51. Heating and easily expandable gas is arranged inside the pneumatic chamber 51. When the temperature rises to the vulcanization required temperature, the gas inside the pneumatic chamber 51 expands and can push the slider 53 out of the pneumatic chamber 51. One end of the pneumatic chamber 51 close to the inner side of the metal skeleton 1 where the slider 53 is located is not communicated with the outside. Through the airtight setting inside the pneumatic chamber 51, it is ensured that the slider 53 can be pushed after the gas expands. The installation chamber 52 is opened on the inner wall of the metal skeleton 1 outside the pneumatic chamber 51.

[0037] Refer to Figure 5 - Figure 7, a control block 54 is slidably connected to the inner wall of the installed bin 52. The shape of the control block 54 is approximately formed by connecting a block with a side view of a "冂" shape at the bottom and a cuboid at the top, and the width of the block at the bottom is wider than the width of the cuboid at the top. An inclined groove 55 is provided in the inner wall of the control block 54. The inclined groove 55 is provided inside the block at the lower part of the control block 54. One end of the slider 53 close to the outside of the metal skeleton 1 is fixedly connected with a moving block 56. The thickness of the moving block 56 fits the distance between the front and rear inner walls of the block at the lower part of the control block 54. A control rod 57 is fixedly connected to the outer wall of the moving block 56. The control rod 57 is located inside the inclined groove 55.

[0038] Refer to Figure 3 , Figure 7 and Figure 8 , a fixing component 58 is provided at one end of the control block 54 away from the moving block 56. The fixing component 58 includes a positioning block 581. The outer wall of the positioning block 581 is fixedly connected to the outer wall of the moving block 56. The distance between the inclined groove 55 near the slider 53 and the positioning block 581 is greater than the distance between the inclined groove 55 away from the slider 53 and the positioning block 581. Through the setting of the distances at both ends of the inclined groove 55, it is ensured that after the moving block 56 moves towards the end away from the slider 53, it can drive the positioning block 581 to move towards the end close to the moving block 56. Moving grooves 582 are provided in the inner walls at the left and right ends of the positioning block 581. A clamping block 583 is slidably connected to the inner wall of the moving groove 582. The cross-sectional shape of the clamping block 583 is approximately a rectangle with a triangle cut off. The outer wall of the clamping block 583 is elastically connected to the inner wall of the moving groove 582 through a spring 584. A positioning groove 585 is provided in the inner wall of the sealing lip body 3.

[0039] Working principle: When in use, the staff first installs the sealing lip body 3 with a distance between the outer side and the connecting area of the metal skeleton 1 greater than the thickness of the inner area of the metal skeleton 1 inside the metal skeleton 1, and then installs the magnetic rubber body 2 at the top of the metal skeleton 1. Since the distance between the upper and lower inner walls of the outer area of the sealing lip body 3 is greater than the distance between the upper and lower outer walls of the inner side of the metal skeleton 1, the adhesive 4 attached to the upper and lower ends of the metal skeleton 1 will not be pushed out due to the installation of the sealing lip body 3.

[0040] After the installation is completed, the staff presses down the sealing lip body 3 in the upper part of the metal frame 1, and presses upward the outer wall of the sealing lip body 3 in the lower part of the metal frame 1, so that the inner wall of the sealing lip body 3 contacts the inclined surface of the block 583 during the pressing process, and squeezes the inclined surface of the block 583, so that the block 583 first returns to the movable groove 582 under the squeezing action of the sealing lip body 3, and then enters the positioning groove 585 under the elastic force of the spring 584 after the block 583 moves to the same horizontal plane position as the positioning groove 585, thereby ensuring that even if the metal frame 1 and the sealing lip body 3 are not completely fitted, the sealing lip body 3 can be fixed to the outside of the metal frame 1 in the expected manner and shape.

[0041] When the installation is completed, the staff performs vulcanization treatment on the installed device. When the vulcanization treatment begins, the temperature near the device rises, so the gas inside the air pressure chamber 51 expands, thereby increasing the gas pressure inside the air pressure chamber 51, so that the slider 53 can move toward the side close to the outside of the metal frame 1 under the action of air pressure.

[0042] After the slider 53 moves, the slider 53 drives the moving block 56 to move, so that the moving block 56 drives the control rod 57 to move, so that the control rod 57 contacts the inner wall of the inclined groove 55 during the movement, and through the inclined setting of the inclined groove 55, the control block 54 moves toward the side close to the moving block 56, thereby driving the positioning block 581 to move toward the end close to the moving block 56, thereby ensuring that the sealing lip body 3 can be pulled by the fixing component 58, so that there is a force to fit the metal frame 1 at the outer side of the sealing lip body 3 close to the metal frame 1, so the sealing lip body 3 can fit tightly with the metal frame 1 during the vulcanization process, so after the vulcanization is completed to form an integrated body, it is not easy to deform during use and cause separation from the metal frame 1.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic encoder with a sealing lip, comprising a metal frame (1), characterized in that: A magnetic rubber body (2) is provided at the top of the metal skeleton (1). A sealing lip body (3) is provided inside the metal skeleton (1). An adhesive (4) is provided on the surface of the metal skeleton (1). A control mechanism (5) is provided inside the metal skeleton (1). The control mechanism (5) includes a pneumatic chamber (51) and an installation chamber (52). The pneumatic chamber (51) is opened on the inner wall of the metal skeleton (1). A piston of the inner wall of the pneumatic chamber (51) is connected to a slider (53). The installation chamber (52) is opened on the inner wall of the metal skeleton (1) outside the pneumatic chamber (51). A control block (54) is slidably connected to the inner wall of the installation chamber (52). An inclined groove (55) is opened on the inner wall of the control block (54). One end of the slider (53) close to the outside of the metal skeleton (1) is fixedly connected to a moving block (56). A fixing component (58) is provided at one end of the control block (54) away from the moving block (56). The fixing component (58) includes a positioning block (581).

2. A magnetic encoder with sealing lip according to claim 1, characterized in that: A control rod (57) is fixedly connected to the outer wall of the moving block (56). The control rod (57) is inside the inclined groove (55).

3. A magnetic encoder with sealing lip according to claim 1, characterized in that: The outer wall of the positioning block (581) is fixedly connected to the outer wall of the moving block (56). Moving grooves (582) are opened on the inner walls of the left and right ends of the positioning block (581). A clamping block (583) is slidably connected to the inner wall of the moving groove (582). The outer wall of the clamping block (583) is elastically connected to the inner wall of the moving groove (582) by a spring (584). A positioning groove (585) is opened on the inner wall of the sealing lip body (3).

4. A magnetic encoder with sealing lip according to claim 1, characterized in that: The shapes of the metal skeleton (1), the magnetic rubber body (2) and the sealing lip body (3) are all set to be annular, and the sizes of the magnetic rubber body (2) and the sealing lip body (3) both fit the metal skeleton (1).

5. A magnetic encoder with sealing lip according to claim 1, characterized in that: The distance between one end of the inclined groove (55) close to the slider (53) and the positioning block (581) is farther than the distance between one end of the inclined groove (55) away from the slider (53) and the positioning block (581).

6. A magnetic encoder with sealing lip according to claim 1, characterized in that: An interference fit is generated between the outer diameter of the metal skeleton (1) and the inner diameter of the magnetic rubber body (2), and the thickness of the metal skeleton (1) wrapping the magnetic rubber body (2) is 1.0 to 1.2 millimeters.

7. A magnetic encoder with sealing lip according to claim 1, characterized in that: The material of the sealing lip body (3) is set to NBR nitrile rubber, and the shape of the sealing lip body (3) is composed of a connecting part with a cross-section approximately in the shape of a C connected to the metal skeleton (1) on the outside and a sealing part with a cross-section approximately in the shape of an L on the inside.

8. A magnetic encoder with sealing lip according to claim 1, characterized in that: Heating and easily expandable gas is provided inside the pneumatic chamber (51). One end of the pneumatic chamber (51) close to the inner side of the metal skeleton (1) where the slider (53) is located is not communicated with the outside.

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