Angle sensor
The angle sensor's sliding sleeve seat and pre-tightening element maintain sealing despite wear, extending sensor life by continuous force application and wear detection, reducing downtime.
Patent Information
- Application Number
- CN202411586771.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2024-12-20
AI Technical Summary
The sealing rings of angle sensors wear out easily, necessitating frequent machine stops for replacement, which prolongs production cycles.
An angle sensor design featuring a sliding sleeve seat with a detachable sealing ring and a pre-tightening element that applies continuous force to maintain sealing, even when the ring is worn, combined with monitoring components to detect wear and an alarm system for timely replacement.
The design extends the effective sealing time of the sealing ring, improving the life of the angle sensor by maintaining a seal without frequent replacements.
Smart Images
Figure CN119164351A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sensors, and in particular to an angle sensor. Background Art
[0002] At present, angle sensors are widely used in industrial automatic control systems such as servo control systems, industrial robots, CNC machine tools, vehicles, textiles, engineering machinery, petrochemicals, coal mining machinery, water conservancy and hydropower, and water transport ships. For many application fields, they often need to be used in open-air outdoor conditions, exposed to wind and rain, or even soaked in mud or under a certain deep water pressure, which puts forward the use requirements of sealing functions for angle sensors with dynamic measurement.
[0003] For the sealing structure of the angle sensor input shaft, the current mainstream method is to use a sealing ring (such as an O-ring) sleeved on the circumferential surface of the input shaft to achieve sealing between the rotating input shaft and the housing. However, since the sealing ring is easily worn, the service life of the angle sensor is short, and it is necessary to frequently stop the machine to replace the sealing ring, which will extend the production cycle. Summary of the invention
[0004] Based on the above problems existing in the prior art, the present invention aims to solve the technical problem in the prior art that the sealing ring of the angle sensor is easily worn. Once the sealing ring is worn, the machine needs to be stopped for replacement, which will prolong the production cycle.
[0005] The present invention provides an angle sensor, which comprises a housing having a sealed cavity, an input shaft rotatably arranged in the housing, and at least one sealing assembly arranged along the length direction of the input shaft, one end of the input shaft extends through the housing to the outside, the input shaft has at least one tapered section along its length direction, and the sealing assembly comprises:
[0006] A sliding sleeve seat, which is sleeved in the sealing cavity and forms a sliding sealing structure with the inner wall of the sealing cavity;
[0007] A sealing ring is detachably fixed on the sliding sleeve seat, and the sealing ring is sleeved on the outer surface of the conical section to form a rotating sealing structure therebetween;
[0008] The pre-tightening element is used to continuously apply a pre-tightening force toward the large end of the tapered section to the sliding sleeve seat.
[0009] According to an embodiment of the present invention, the angle sensor further includes a plurality of monitoring components arranged corresponding to the sealing components, for monitoring the wear conditions of the corresponding sealing rings.
[0010] According to an embodiment of the present invention, the pre-tightening element is an elastic member, which is used to apply a pre-tightening force to the corresponding sliding sleeve seat based on the elastic force of the elastic member;
[0011] The monitoring component monitors the wear condition of the corresponding sealing ring based on the displacement of the corresponding sliding sleeve seat, or monitors the wear condition of the corresponding sealing ring based on the elastic force of the corresponding elastic member.
[0012] According to an embodiment of the present invention, the conical sections on the input shaft and the sealing assemblies are arranged in one-to-one correspondence, and there are two of each. The sealing rings in the two sealing assemblies are respectively sleeved on the outer surfaces of the corresponding conical sections.
[0013] According to an embodiment of the present invention, the two conical sections on the input shaft are arranged opposite to each other so that the two sealing assemblies share one elastic member, and the two ends of the elastic member are respectively fixedly connected to the two sliding sleeve seats.
[0014] According to one embodiment of the present invention, the monitoring component includes a force / distance sensor, which is fixedly arranged on the end surface of one of the sliding sleeves facing the other sliding sleeve seat, and is used to simultaneously monitor the wear of the two sealing rings based on the elastic force of the elastic member or the distance between the two sliding sleeve seats.
[0015] According to an embodiment of the present invention, the large ends of the two conical sections are arranged opposite to each other, and the force / distance sensor is a tension sensor, which can monitor the wear of the two sealing rings based on the tension of the elastic member; or
[0016] The small ends of the two conical sections are arranged opposite to each other, and the force / distance sensor is a pressure sensor, which can monitor the wear of the two sealing rings based on the pressure of the elastic member.
[0017] According to an embodiment of the present invention, the monitoring component further comprises an alarm device fixedly arranged on the outer surface of the shell, and the alarm device is electrically connected to the force / distance sensor.
[0018] According to one embodiment of the present invention, the angle sensor further comprises a bearing group, a bearing chamber is provided in the housing and located inside the sealing cavity, the bearing group is arranged in the bearing chamber, and the input shaft is rotatably engaged with the housing through the bearing group.
[0019] The beneficial effects of the present invention are:
[0020] In an angle sensor provided by the present invention, the pre-tightening element can continuously apply a pre-tightening force toward the large end of the tapered section to the corresponding sliding sleeve seat. Even if the sealing ring is worn, the pre-tightening element can push the corresponding sealing ring to move toward the large end of the tapered section through the sliding sleeve seat, thereby continuing to maintain an effective seal between the sealing ring and the outer surface of the tapered section of the input shaft. Compared with the prior art in which the sealing ring needs to be replaced once it is worn, the effective sealing time of the sealing ring is extended, thereby improving the life of the angle sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 is a structural schematic diagram of an angle sensor provided in Embodiment 1 of the present invention;
[0023] Figure 2 is a schematic structural diagram of a sealing ring in Embodiment 1 of the present invention;
[0024] Figure 3 is a structural schematic diagram of an angle sensor provided by Embodiment 2 of the present invention;
[0025] Figure numerals: 1-housing; 11-sealing chamber; 12-bearing chamber; 2-input shaft; 3-sealing assembly; 31-sleeve seat; 32-sealing ring; 33-preload element; 4-monitoring assembly; 41-force / distance sensor; 42-warning device; 5-bearing group. DETAILED DESCRIPTION
[0026] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented.
[0027] The present invention provides an angle sensor, the structure of which is as follows Figure 1As shown, it includes a housing 1 with a sealing cavity 11, an input shaft 2 rotatably arranged in the housing 1 and at least one sealing assembly 3 arranged along the length direction of the input shaft 2, one end of the input shaft 2 extends to the outside through the housing 1, and the input shaft 2 has at least one tapered section along its length direction, and the sealing assembly 3 includes a sleeve seat 31, a sealing ring 32 and a preload element 33, wherein the sleeve seat 31 is sleeved in the sealing cavity 11 and forms a sliding sealing structure with the inner wall of the sealing cavity 11, and is positioned in the circumferential direction to prevent it from rotating with the input shaft 2; the sealing ring 32 is detachably fixed on the sleeve seat 31, and the sealing ring 32 is sleeved on the outer surface of the tapered section to form a rotating sealing structure between the two; the preload element 33 is used to continuously apply a preload force toward the large end of the tapered section to the sleeve seat 31.
[0028] It is not difficult to understand that, since the pre-tightening element 33 can continuously apply a pre-tightening force toward the large end of the tapered section to the sleeve seat 31, when the sealing ring 32 is worn, the pre-tightening element 33 can push the corresponding sealing ring 32 to move toward the large end of the tapered section through the sleeve seat 31, so that an effective sealing structure can continue to be formed between the sealing ring 32 and the outer surface of the tapered section of the input shaft 2, thereby extending the effective sealing time of the sealing ring 32 and improving the life of the angle sensor.
[0029] It is easy to understand that the sealing principle of the sealing ring 32 is similar to that of a sealing ring (such as an O-ring), except that in order to allow the sealing ring 32 to continue to be used after being worn, the sealing ring 32 should have a certain wall thickness, such as Figure 2 FIG. 1 is a schematic diagram of the structure of the sealing ring 32 in this embodiment. Specifically, the wall thickness of the sealing ring 32 may be 5 to 15 mm.
[0030] Furthermore, the angle sensor also includes a plurality of monitoring components 4 arranged corresponding to the sealing components 3 to monitor the wear conditions of the corresponding sealing rings 32 .
[0031] Preferably, the pre-tightening element 33 is an elastic member, which is used to apply a pre-tightening force to the corresponding sliding sleeve seat 31 based on the elastic force of the elastic member; preferably, the pre-tightening element 33 can be a spring;
[0032] The monitoring component 4 monitors the wear condition of the corresponding sealing ring 32 based on the displacement of the corresponding sliding sleeve seat 31. In particular, when the preload element 33 is an elastic member, the monitoring component 4 can also monitor the wear condition of the corresponding sealing ring 32 based on the elastic force of the corresponding elastic member.
[0033] Embodiment 1
[0034] like Figure 1 The figure is a schematic diagram of the structure of the angle sensor in the first embodiment. In the present embodiment, the conical sections on the input shaft 2 and the sealing assemblies 3 are arranged in one-to-one correspondence, and two of them are respectively arranged. The sealing rings 32 in the two sealing assemblies 3 are respectively sleeved on the outer surfaces of the corresponding conical sections.
[0035] Specifically, the two conical sections on the input shaft 2 are arranged opposite to each other, so that the two sealing assemblies 3 share one elastic member, and the two ends of the elastic member are fixedly connected to the two sliding sleeve seats 31 respectively.
[0036] It can be understood that since the two conical sections on the input shaft 2 are arranged relatively to each other so that the two sealing assemblies 3 share one elastic member, the number of elastic members used can be reduced, thereby simplifying the structure of the angle sensor and reducing its size and volume.
[0037] Furthermore, the monitoring component 4 includes a force / distance sensor 41, which is fixedly arranged on the end face of one of the sliding sleeve seats 31 facing the other sliding sleeve seat 31, and is used to simultaneously monitor the wear of the two sealing rings 32 based on the elastic force of the elastic member or the distance between the two sliding sleeve seats 31.
[0038] It should be noted that the force / distance sensor 41 refers to a force sensor or a distance sensor, wherein when the force / distance sensor 41 is a force sensor, the parameter it measures is the elastic force of the elastic member, and when the force / distance sensor 41 is a distance sensor, the parameter it measures is the distance between the two sleeve seats 31.
[0039] Specifically, the large ends of the two conical sections are arranged opposite to each other. At this time, the length of the elastic member should be greater than its original length, so that the sliding sleeve seat 31 moves toward the large ends of the conical sections under the pulling force of the elastic member.
[0040] Moreover, when the force / distance sensor 41 selects a force sensor, it should actually be a tension sensor, and the parameter it measures is the tension of the elastic member. At this time, the end of the elastic member should be fixedly connected to the tension sensor fixed on the sliding sleeve seat 31. At this time, the wear of the two sealing rings 32 can be monitored based on the tension measured by the tension sensor. Specifically, when the tension measured by the tension sensor is large, it means that the sealing ring 32 is not worn or slightly worn. When the tension measured by the tension sensor is small, it means that the sealing ring 32 is seriously worn.
[0041] When the force / distance sensor 41 selects a distance sensor, the parameter it measures is the distance between the two sleeve seats 31. At this time, the wear of the sealing ring 32 can be monitored based on the distance between the two sleeve seats 31 measured by the distance sensor. Specifically, when the distance measured by the distance sensor is large, it means that the sealing ring 32 is not worn or is slightly worn. When the distance measured by the distance sensor is small, it means that the sealing ring 32 is severely worn.
[0042] Furthermore, the monitoring component 4 also includes an alarm 42 fixedly arranged on the outer surface of the shell 1, and the alarm 42 is electrically connected to the force / distance sensor 41. The alarm 42 is used to give different prompt information according to the monitoring result of the force / distance sensor 41. Preferably, the alarm 42 is selected as a warning light that can emit red light and green light. When the monitored sealing ring 32 is not worn or slightly worn, the alarm 42 displays green light. When the monitored sealing ring 32 is severely worn, the alarm 42 displays red light.
[0043] In this embodiment, the angle sensor also includes a bearing group 5. A bearing chamber 12 is opened in the housing 1 and located on the inner side of the sealing cavity 11. The bearing group 5 is arranged in the bearing chamber 12. The input shaft 2 is rotatably matched with the housing 1 through the bearing group 5.
[0044] It can be understood that by arranging the bearing group 5 in the bearing chamber 12 located inside the sealing cavity 11, the sealing assembly 3 can provide sealing for the bearing group 5 without the need for additionally arranging a bearing sealing assembly, thereby further simplifying the structure of the angle sensor.
[0045] Embodiment 2
[0046] like Figure 3 The figure shows a schematic diagram of the structure of the angle sensor in the second embodiment. The difference between the second embodiment and the first embodiment is that the small ends of the two conical sections in the second embodiment are arranged relative to each other. At this time, the length of the elastic member should be smaller than its original length so that the sliding sleeve seat 31 is pushed by the elastic member and moves toward the large end of the conical section.
[0047] Moreover, when the force / distance sensor 41 selects a force sensor, it should actually be a pressure sensor, and the parameter measured by it is the pressure of the elastic member. At this time, the end of the elastic member should be abutted against the pressure sensor fixed on the sliding sleeve seat 31. At this time, the wear of the two sealing rings 32 can be monitored based on the pressure measured by the pressure sensor. Specifically, when the pressure measured by the pressure sensor is large, it means that the sealing ring 32 is not worn or slightly worn. When the pressure measured by the pressure sensor is small, it means that the sealing ring 32 is seriously worn.
[0048] When the force / distance sensor 41 selects a distance sensor, the parameter it measures is the distance between the two sleeve seats 31. At this time, the wear of the sealing ring 32 can be monitored based on the distance between the two sleeve seats 31 measured by the distance sensor. Specifically, when the distance measured by the distance sensor is small, it means that the sealing ring 32 is not worn or is slightly worn. When the distance measured by the distance sensor is large, it means that the sealing ring 32 is seriously worn.
[0049] In order to facilitate the understanding of this scheme, the following Figure 1 The working principle of the present invention is described in detail:
[0050] Figure 1 In the embodiment, the force / distance sensor 41 is preferably a tension sensor. When the angle sensor is in use, it is fixedly connected to the object to be measured (generally a rotating shaft) to monitor the rotation angle of the object to be measured.
[0051] Since a rotating sealing structure is formed between the sealing ring 32 and the outer surface of the tapered section of the input shaft 2, the two sealing rings 32 will be worn after working for a period of time; since the two sealing rings 32 are made of the same material and the tension is provided by the same elastic member, the wear amount of the two sealing rings 32 is equivalent. When the sealing ring 32 is worn, the sealing ring 32 will move toward the large end of the tapered section under the tension of the elastic member, and the two sealing rings 32 will move closer to each other, resulting in a decrease in the length of the elastic member between the two sealing rings 32. After the length of the elastic member is reduced, the tension of the sealing ring 32 from the elastic member will be reduced. In the meantime, the force / distance sensor 41 monitors the tension of the elastic member in real time, and judges the wear of the sealing ring 32 according to the monitored tension, and feeds back the judgment result to the staff through the alarm 42.
[0052] Preferably, the alarm 42 is selected to be a warning light that can emit red light and green light. When the monitored sealing ring 32 is not worn or slightly worn, the alarm 42 displays green light. When the monitored sealing ring 32 is severely worn, the alarm 42 displays red light.
[0053] To sum up, in an angle sensor provided by the present invention, the pre-tightening element 33 can continuously apply a pre-tightening force toward the large end of the tapered section to the corresponding sleeve seat 31. Even if the sealing ring 32 is worn, the pre-tightening element 33 can push the corresponding sealing ring 32 to move toward the large end of the tapered section through the sleeve seat 31, thereby continuing to maintain an effective seal between the sealing ring 32 and the outer surface of the tapered section of the input shaft 2. Compared with the prior art in which the sealing ring needs to be replaced once it is worn, the effective sealing time of the sealing ring 32 is extended, thereby improving the life of the angle sensor.
[0054] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.
Claims
1. An angle sensor, characterized in that: The invention comprises a housing (1) having a sealing cavity (11), an input shaft (2) rotatably arranged in the housing (1), and at least one sealing assembly (3) arranged along the length direction of the input shaft (2), one end of the input shaft (2) passes through the housing (1) and extends to the outside, the input shaft (2) has at least one tapered section along its length direction, and the sealing assembly (3) comprises: A sliding sleeve seat (31) is sleeved in the sealing cavity (11) and forms a sliding sealing structure with the inner wall of the sealing cavity (11); A sealing ring (32) is detachably fixed on the sliding sleeve seat (31), and the sealing ring (32) is sleeved on the outer surface of the conical section to form a rotating sealing structure therebetween; The pre-tightening element (33) is used to continuously apply a pre-tightening force toward the large end of the tapered section to the sliding sleeve seat (31).
2. An angle sensor according to claim 1, characterized in that: It also includes a plurality of monitoring components (4) arranged corresponding to the sealing components (3) for monitoring the wear conditions of the corresponding sealing rings (32).
3. An angle sensor according to claim 2, characterized in that: The pre-tightening element (33) is an elastic member, and is used to apply a pre-tightening force to the corresponding sliding sleeve seat (31) based on the elastic force of the elastic member; The monitoring component (4) monitors the wear condition of the corresponding sealing ring (32) based on the displacement of the corresponding sliding sleeve seat (31), or monitors the wear condition of the corresponding sealing ring (32) based on the elastic force of the corresponding elastic member.
4. An angle sensor according to claim 3, characterized in that: The conical sections on the input shaft (2) and the sealing assemblies (3) are arranged in one-to-one correspondence, and two of each are arranged. The sealing rings (32) in the two sealing assemblies (3) are respectively sleeved on the outer surfaces of the corresponding conical sections.
5. An angle sensor according to claim 4, characterized in that: The two conical sections on the input shaft (2) are arranged opposite to each other so that the two sealing assemblies (3) share one elastic member, and the two ends of the elastic member are respectively fixedly connected to the two sliding sleeve seats (31).
6. An angle sensor according to claim 5, characterized in that: The monitoring component (4) comprises a force / distance sensor (41), wherein the force / distance sensor (41) is fixedly arranged on an end surface of one of the sliding sleeve seats (31) facing the other sliding sleeve seat (31), and is used to simultaneously monitor the wear conditions of the two sealing rings (32) based on the elastic force of the elastic member or the distance between the two sliding sleeve seats (31).
7. An angle sensor according to claim 6, characterized in that: The large ends of the two conical sections are arranged opposite to each other, and the force / distance sensor (41) is a tension sensor, which can monitor the wear of the two sealing rings (32) based on the tension of the elastic member; or The small ends of the two conical sections are arranged opposite to each other, and the force / distance sensor (41) is a pressure sensor, which can monitor the wear of the two sealing rings (32) based on the pressure of the elastic member.
8. The angle sensor according to claim 6, characterized in that: The monitoring component (4) further comprises an alarm device (42) fixedly arranged on the outer surface of the housing (1), and the alarm device (42) is electrically connected to the force / distance sensor (41).
9. The angle sensor according to claim 1, characterized in that: It also comprises a bearing group (5), a bearing chamber (12) is provided in the housing (1) and located on the inner side of the sealing cavity (11), the bearing group (5) is arranged in the bearing chamber (12), and the input shaft (2) is rotatably matched with the housing (1) through the bearing group (5).